Ophthalmologic apparatus, control method thereof, computer program product, and storage medium

Abstract

An ophthalmic apparatus, a control method thereof, a computer program product, and a storage medium. The present invention captures an eye to be examined at a maximum viewing angle at which the device does not contact the face of a person to be examined while preventing the diameter of an objective lens from becoming larger. The ophthalmic apparatus includes: an optical system including: an objective lens; an illumination system that irradiates an eye of the subject with illumination light via the objective lens; and a photographing system that receives return light of the illumination light via the objective lens; a first movement mechanism that moves the optical system relative to the eye of the subject; a second movement mechanism that relatively moves the objective lens, the illumination system, and the imaging system in the optical system in the optical axis direction of the objective lens; a contact determination unit that determines whether or not a predetermined part of the face of the subject is in contact with a local part of the device due to the movement by the first movement mechanism; and a control unit that controls the second movement mechanism such that the working distance between the objective lens and the eye of the subject differs in response to the determination result obtained by the contact determination unit.

Description

Technical Field

[0001] The present disclosure relates to an ophthalmic device, a control method of an ophthalmic device, a computer program product, and a computer-readable storage medium. Background Art

[0002] In a fundus camera that photographs the fundus of an eye to be inspected, it is desirable to photograph the photographing part at a wide angle to improve the usefulness of diagnostic assistance. When photographing the photographing part at a wide angle, a fundus image is obtained by reflecting light of the illumination light incident on a larger photographing area including the photographing part of the fundus through the pupil. Therefore, when photographing the area including the photographing part at a wide angle, it is necessary to increase the diameter of the objective lens arranged facing the eye to be inspected.

[0003] In this regard, by shortening the distance between the eye to be examined and the objective lens, the diameter of the objective lens can be reduced. However, when the diameter of the objective lens is reduced, the working distance between the eye to be examined (e.g., corneal vertex) and the optical system (e.g., objective lens) is shortened. As a result, the possibility of the optical system or the housing (device body) containing the optical system contacting the part of the face of the examinee (the part of the eye or nose, eyebrows, forehead, etc., the peripheral area of ​​the eye) is increased.

[0004] For example, Patent Document 1 discloses a method in which the three-dimensional shape of a subject's face is detected and the obtained detection result is used to align the subject's visual axis with the optical axis of a device.

[0005] For example, Patent Document 2 discloses a method in which the convex part of the subject's face is detected and the movement path of the measuring head is controlled using the detection result so that the closest distance between the measuring head and the convex part of the subject's face becomes greater than a predetermined distance when the measurement of the left and right eyes is switched.

[0006] Patent Document 1: U.S. Patent Application Publication No. 2013 / 0286353

[0007] Patent Document 2: Japanese Patent Application Publication No. 2022-104668 Summary of the invention

[0008] However, even in the methods disclosed in Patent Documents 1 and 2, reducing the diameter of the objective lens will make the working distance very short, and the possibility of the optical system or the housing contacting the face of the subject due to the movement of the face of the subject during the measurement process increases. As a result, it becomes difficult to shoot the area including the shooting part at a wide angle. Therefore, it is desired to shoot the area including the shooting part at the maximum angle of view without contacting the face of the subject while avoiding the increase of the diameter of the objective lens.

[0009] This problem occurs not only in ophthalmic apparatuses that photograph the fundus of the eye to be examined, but also in ophthalmic apparatuses that photograph sites other than the fundus (eg, the anterior ocular segment).

[0010] The present invention has been made in view of such circumstances, and one of its purposes is to provide a new technology for photographing a subject's eye at a maximum viewing angle without the device contacting the subject's face while avoiding an increase in the diameter of the objective lens.

[0011] One embodiment is an ophthalmic device, comprising: an optical system, including an objective lens; an illumination system, which irradiates illumination light to the eye of the subject via the objective lens; and a photographing system, which receives return light of the illumination light via the objective lens; a first moving mechanism, which causes the optical system to move relative to the eye of the subject; a second moving mechanism, which causes the objective lens, the illumination system and the photographing system to move relative to each other along the optical axis direction of the objective lens in the optical system; a contact determination unit, which determines whether a predetermined part of the face of the subject is in contact with a part of the device due to the movement performed by the first moving mechanism; and a control unit, which controls the second moving mechanism so that the working distance between the objective lens and the eye of the subject is different in response to the determination result obtained by the contact determination unit.

[0012] Another embodiment of the present invention is a method for controlling an ophthalmic device, the ophthalmic device comprising: an optical system including an objective lens; an illumination system for irradiating illumination light to the eye of a subject via the objective lens; and a photographing system for receiving return light of the illumination light via the objective lens; a first moving mechanism for causing the optical system to move relative to the eye of the subject; and a second moving mechanism for causing the objective lens, the illumination system and the photographing system to move relative to each other along the optical axis direction of the objective lens in the optical system. The method for controlling the ophthalmic device comprises: a contact determination step for determining whether a predetermined part of the face of the subject is in contact with a part of the device due to movement by the first moving mechanism; and a control step for controlling the second moving mechanism so that the working distance between the objective lens and the eye of the subject changes in response to a determination result obtained in the contact determination step.

[0013] Another embodiment is a computer program product including a computer program / command. When the computer program / command is executed by a processor, the computer program product implements the steps of the control method of the ophthalmic device.

[0014] Another embodiment is a computer-readable storage medium (recording medium) storing a computer program / command. When the computer program / command is executed by a processor, the computer-readable storage medium implements each step of the control method of the ophthalmic device.

[0015] According to the present invention, it is possible to provide a new technology for photographing a subject's eye at a maximum viewing angle without the device contacting the subject's face while avoiding an increase in the diameter of the objective lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram showing a configuration example of an optical system of an ophthalmologic apparatus according to the first embodiment.

[0017] Figure 2 It is a schematic diagram showing a configuration example of an optical system of an ophthalmologic apparatus according to the first embodiment.

[0018] Figure 3 This is a schematic diagram showing an outline of the configuration of an optical system of an ophthalmologic apparatus according to the first embodiment.

[0019] Figure 4 It is a diagram for explaining the operation of the ophthalmologic apparatus according to the first embodiment.

[0020] Figure 5 It is a diagram for explaining the operation of the ophthalmologic apparatus according to the first embodiment.

[0021] Figure 6 It is a diagram for explaining the operation of the ophthalmologic apparatus according to the first embodiment.

[0022] Figure 7 It is a schematic diagram showing a configuration example of a control system of the ophthalmologic apparatus according to the first embodiment.

[0023] Figure 8 It is a schematic diagram showing a configuration example of a control system of the ophthalmologic apparatus according to the first embodiment.

[0024] Fig. 9 This is a flowchart of an operation example of the ophthalmologic apparatus according to the first embodiment.

[0025] Fig.10 This is a flowchart of an operation example of the ophthalmologic apparatus according to the first embodiment.

[0026] Fig.11 This is a flowchart of an operation example of the ophthalmologic apparatus according to the first embodiment.

[0027] Fig.12 This is a flowchart of an operation example of the ophthalmologic apparatus according to the first embodiment.

[0028] Fig.13 It is a schematic diagram showing a configuration example of an optical system of an ophthalmologic apparatus according to the second embodiment.

[0029] Fig.14 It is a schematic diagram showing a configuration example of an optical system of an ophthalmologic apparatus according to a third embodiment.

[0030] Fig.15 It is a schematic diagram showing a configuration example of a control system of an ophthalmologic apparatus according to the third embodiment.

[0031] Fig.16 This is a flowchart of an operation example of the ophthalmologic apparatus according to the third embodiment.

[0032] Fig.17 It is a schematic diagram showing a configuration example of an optical system of an ophthalmologic apparatus according to a fourth embodiment.

[0033] Fig.18 It is a schematic diagram showing a configuration example of a control system of an ophthalmologic apparatus according to a fourth embodiment.

[0034] Fig.19 It is a schematic diagram showing a configuration example of an optical system of an ophthalmologic apparatus according to a fifth embodiment.

[0035] Fig. 20 It is a schematic diagram showing a configuration example of a control system of an ophthalmologic apparatus according to a fifth embodiment.

[0036] Fig.21 It is a schematic diagram showing a configuration example of an optical system of an ophthalmologic apparatus according to the sixth embodiment.

[0037] Fig. 22 It is a schematic diagram showing a configuration example of a control system of an ophthalmologic apparatus according to the sixth embodiment.

[0038] Fig.23 It is a schematic diagram showing a configuration example of a control system of an ophthalmologic apparatus according to the sixth embodiment.

[0039] Fig.24 This is a flowchart of an operation example of the ophthalmologic apparatus according to the sixth embodiment.

[0040] Description of Reference Numerals

[0041] 1, 1a, 1b, 1c, 1d, 1e: ophthalmic device; 20: illumination optical system; 21: iris aperture; 22: slit; 30: light scanner; 35: projection optical system; 40: photographing optical system; 45: aperture mirror; 46: objective lens; 46D: third moving mechanism; 47: focusing lens; 47D: moving mechanism; 50: photographing device; 51: image sensor; 70: device optical system; 70D: first moving mechanism; 80, 80a: Mobile optical system; 80D: second mobile mechanism; 100, 100b, 100c, 100d, 100e: control unit; 101, 101b, 101c, 101d, 101e: main control unit; 200, 200e: data processing unit; 210: three-dimensional shape data generation unit; 220, 220e: contact judgment unit; 230: moving target position determination unit; 240: optical relationship adjustment amount determination unit; E: eye to be examined; Ef: fundus. DETAILED DESCRIPTION

[0042] An example of an embodiment of an ophthalmic device, an ophthalmic device control method, a computer program product, and a computer-readable storage medium according to the present invention will be described in detail with reference to the accompanying drawings. In addition, the contents of the documents described in this specification can be appropriately cited as the contents of the following embodiments.

[0043] The ophthalmic device involved in the embodiment includes an optical system, which has: an objective lens; an illumination system, which irradiates illumination light to the eye of the subject through the objective lens; and a camera system, which receives the return light of the illumination light through the objective lens. The ophthalmic device also includes a first moving mechanism and a second moving mechanism. The first moving mechanism causes the above-mentioned optical system to move relative to the eye of the subject. The second moving mechanism causes the above-mentioned objective lens, the above-mentioned illumination system and the above-mentioned camera system to move relative to each other along the optical axis direction of the above-mentioned objective lens in the above-mentioned optical system. The ophthalmic device is configured to determine whether a predetermined part of the face of the subject is in contact with a part of the device due to the movement performed by the first moving mechanism, and control the second moving mechanism so that the working distance between the objective lens and the eye of the subject is different in response to the determination result obtained by the contact determination unit.

[0044] Specifically, when it is determined that the predetermined part of the subject's face is not in contact with the part of the device (at the time of non-contact determination), the ophthalmic device is configured to first control the first moving mechanism so that the working distance becomes a predetermined first working distance. Thereafter, the ophthalmic device is configured to cause the imaging system to receive the return light from the subject's eye irradiated with the illumination light.

[0045] On the other hand, when it is determined that a predetermined part of the face of the subject is in contact with a part of the device (at the time of contact determination), the ophthalmic device is configured to control at least one of the first moving mechanism and the second moving mechanism so that the working distance becomes a second working distance greater than the first working distance. Furthermore, the ophthalmic device is configured to control the second moving mechanism to adjust the conjugate relationship within the above-mentioned optical system so that the photographing system receives the return light from the eye of the subject irradiated by the illumination light. In some embodiments, at the time of contact determination, the ophthalmic device controls the second moving mechanism so that the optical conjugate relationship of the illumination system and the photographing system respectively maintains a predetermined conjugate relationship, and controls the photographing system so that a focal position corresponding to the refractive power of the eye of the subject is configured in the photographing system.

[0046] Examples of the predetermined part of the eye to be inspected include the fundus, the anterior ocular segment, the vitreous body, etc. Examples of the predetermined part of the face of the subject to be inspected include the eye, the part of the peripheral area of ​​the eye (peripheral part), etc. Examples of the part of the peripheral area of ​​the eye include the nose, the eyebrows, the forehead, etc.

[0047] In some embodiments, the second moving mechanism moves the illumination system and the camera system relative to the objective lens along the optical axis of the objective lens. In some embodiments, the second moving mechanism moves the illumination system relative to the objective lens and the camera system along the optical axis of the objective lens. In some embodiments, the second moving mechanism moves the objective lens relative to the illumination system and the camera system along the optical axis of the objective lens.

[0048] According to this structure, the eye to be examined can be photographed at a position where the distance between the eye to be examined and the optical system is the shortest distance at which the device and the face of the examinee do not touch each other, while avoiding the diameter of the objective lens from becoming larger. As a result, the eye to be examined can be photographed at the maximum viewing angle at which the device and the face of the examinee do not touch each other.

[0049] The control method of the ophthalmic device involved in the embodiment includes one or more steps for implementing the processing performed by the processor (computer) in the ophthalmic device involved in the embodiment. The program (computer program) / command involved in the embodiment causes the processor to execute each step of the control method of the ophthalmic device involved in the embodiment. The computer program product involved in the embodiment includes a computer program / command. When the computer program / command is executed by the processor, the computer program product implements each step of the control method of the ophthalmic device involved in the embodiment. The recording medium involved in the embodiment is a computer-readable non-temporary recording medium (storage medium) that records the program involved in the embodiment. The computer-readable storage medium involved in the embodiment stores a computer program / command. When the computer program / command is executed by the processor, the computer-readable storage medium implements each step of the control method of the ophthalmic device involved in the embodiment.

[0050] In this specification, "processor" refers to circuits such as CPU (Central Processing Unit), GPU (Graphics Processing Unit), ASIC (Application Specific Integrated Circuit), programmable logic devices (such as SPLD (Simple Programmable Logic Device), CPLD (Complex Programmable Logic Device), FPGA (Field Programmable Gate Array)). The processor realizes the functions involved in the implementation mode by reading and executing the program stored in the storage circuit or storage device.

[0051] Hereinafter, a case where the ophthalmologic apparatus according to the embodiment mainly acquires an image of the fundus of the eye to be inspected will be described.

[0052] In addition, the ophthalmological device involved in the embodiment is described in the case of obtaining the fundus image of the eye to be inspected by a slit scanning method using slit-shaped illumination light. Specifically, the ophthalmological device illuminates a predetermined part of the eye to be inspected while using an optical scanner to deflect the slit-shaped illumination light and move the slit-shaped irradiation position (irradiation range), and uses an image sensor in which photosensitive elements are arranged one-dimensionally or two-dimensionally to receive the return light from the predetermined part. The light-receiving result of the return light is read from the photosensitive element at the light-receiving position of the return light corresponding to the irradiation position of the illumination light in synchronization with the movement timing of the irradiation position of the illumination light.

[0053] Hereinafter, the X direction is a direction perpendicular to the optical axis direction of the objective lens (horizontal direction), the Y direction is a direction perpendicular to the optical axis direction of the objective lens (vertical direction), and the Z direction is an optical axis direction of the objective lens.

[0054] <First Embodiment>

[0055] [Optical system structure]

[0056] Figure 1 to Figure 3 A configuration example of an optical system of an ophthalmologic apparatus according to the first embodiment is shown. Figure 1 A configuration example of the optical system of the ophthalmologic apparatus 1 according to the first embodiment is shown. Figure 2 Schematically showing the Figure 1 A structural example of the iris aperture 21. Figure 3 Show Figure 1 An overview of the structure of the relay lens systems RL1 and RL2. Figure 1 to Figure 3 In the drawings, the same parts are denoted by the same reference numerals and the description is appropriately omitted.

[0057] The ophthalmic device 1 includes an illumination optical system 20, a light scanner 30, a projection optical system 35, a photographing optical system 40, a photographing device 50, an objective lens 46, and cameras 60A and 60B. In some embodiments, the light source 10 is provided outside the illumination optical system 20. In some embodiments, the illumination optical system 20 includes at least one of the light scanner 30 and the projection optical system 35. In some embodiments, the photographing optical system 40 includes the photographing device 50. In some embodiments, the projection optical system 35 or the illumination optical system 20 includes the light scanner 30.

[0058] In the ophthalmologic apparatus 1, the apparatus optical system 70 includes an illumination optical system 20, an optical scanner 30, a projection optical system 35, a photographing optical system 40, a photographing device 50, an objective lens 46, and cameras 60A and 60B. The apparatus optical system 70 is configured to be movable integrally with respect to the subject's eye E. The apparatus optical system 70 is configured to be movable three-dimensionally (i.e., in the X direction, the Y direction, and the Z direction).

[0059] Such an ophthalmic device 1 is configured so that the objective lens 46, the illumination optical system 20, and the imaging optical system 40 can be relatively moved along the optical axis direction of the objective lens 46 in the device optical system 70. In the first embodiment, the ophthalmic device 1 is configured so that the movable optical system 80 including the illumination optical system 20, the light scanner 30, the projection optical system 35, the imaging optical system 40, and the imaging device 50 in the device optical system 70 can be relatively moved along the optical axis direction of the objective lens 46 with respect to the objective lens 46.

[0060] (Illumination Optical System 20)

[0061] The illumination optical system 20 generates slit-shaped illumination light using the light from the light source 10 , and guides the generated illumination light to the optical scanner 30 .

[0062] The illumination optical system 20 includes a light source 10 , a condenser lens 11 , decentered lenses 12A and 12B, an iris stop 21 , a relay lens system RL2 , a slit 22 , and a relay lens system RL1 .

[0063] (Light source 10)

[0064] The light source 10 is preferably arranged at a position (iris conjugate position, pupil conjugate position) that is optically substantially conjugate with the iris (pupil) of the eye to be inspected. The light source 10 includes a visible light source that emits light in the visible range. For example, the light source 10 emits light having a central wavelength in the wavelength range of 420 nm to 700 nm. Such a light source 10 includes, for example, an LED (Light Emitting Diode), an LD (Laser Diode), a halogen lamp, or a xenon lamp. In some embodiments, the light source 10 includes a light source that can output a white light source or light of each color component of RGB. In some embodiments, the light source 10 includes a light source that can switch to output light in the infrared range or light in the visible range. In some embodiments, the light source 10 includes a phosphor (central fluorescent wavelength 550 nm), a first LD (central wavelength 450 nm) that emits excitation light for exciting the phosphor, a second LED (central wavelength 450 nm), and an optical path coupling component. The optical path coupling component outputs white light by synthesizing the outgoing light from the phosphor excited by the first LED with the outgoing light from the second LED.

[0065] (Focusing lens 11)

[0066] The condenser lens 11 condenses light emitted from the light source 10. The light source 10 is arranged at the focal position of the condenser lens 11, and the light emitted from the light source 10 is converted into substantially parallel light and guided to the decentered lenses 12A and 12B.

[0067] (iris aperture 21)

[0068] The iris diaphragm 21 (specifically, an opening described later) can be arranged at a position that is substantially optically conjugate with the iris (pupil) of the eye E. One or more openings are formed at positions away from the optical axis O in the iris diaphragm 21 .

[0069] like Figure 2As shown in FIG. 1 , openings 21A and 21B having a predetermined width in the radial direction are formed on the iris diaphragm 21 along the circumferential direction centered on the optical axis O. The opening formed in the iris diaphragm 21 defines the incident position (incident shape) of the illumination light on the iris of the subject's eye E. For example, Figure 2 The openings 21A and 21B formed as shown can allow illumination light to enter the eye from a position eccentric to the pupil center (specifically, a position symmetrical about the pupil center) when the pupil center of the subject's eye E is arranged on the optical axis O.

[0070] exist Figure 2 In the embodiment, the iris diaphragm 21 is provided with openings 21A and 21B, but the embodiment is not limited to the number of openings formed in the iris diaphragm 21. For example, a single opening or three or more openings may be formed in the iris diaphragm 21.

[0071] (Decentered lenses 12A, 12B)

[0072] like Figure 1 As shown in FIG. 1 , the decentered lenses 12A and 12B are lenses disposed at positions decentered from the optical axis O (optical axis of the iris diaphragm 21), and function as light-collecting members. The decentered lenses 12A and 12B are disposed between the light-collecting lens 11 (light source 10) and the iris diaphragm 21. The decentered lenses 12A and 12B are disposed corresponding to the openings 21A and 21B formed in the iris diaphragm 21, respectively. When the iris diaphragm 21 is formed with n (n is an integer greater than or equal to 2) openings, the n decentered lenses disposed corresponding to the n openings are disposed between the light-collecting lens 11 and the iris diaphragm 21.

[0073] exist Figure 1 In the embodiment, the decentered lens 12A is arranged at a position decentered from the optical axis O of the illumination optical system 20 so as to face the opening 21A of the iris diaphragm 21. In addition, the opening 21A of the iris diaphragm 21 is arranged at the focal position of the decentered lens 12A. That is, the decentered lens 12A converges the illumination light from the condenser lens 11 at the opening 21A.

[0074] Similarly, the decentered lens 12B is arranged at a position decentered from the optical axis O of the illumination optical system 20 so as to face the opening 21B of the iris diaphragm 21. In addition, the opening 21B of the iris diaphragm 21 is arranged at the focal position of the decentered lens 12B. That is, the decentered lens 12B converges the illumination light from the condenser lens 11 at the opening 21B.

[0075] The decentered lens 12A is disposed so that the optical axis thereof passes through the opening 21A of the iris diaphragm 21. In addition, the decentered lens 12B is disposed so that the optical axis thereof passes through the opening 21B of the iris diaphragm 21.

[0076] In some embodiments, in the decentered lenses arranged corresponding to the opening formed in the iris diaphragm 21, the outer peripheries of the two adjacent decentered lenses are D-cut. In this case, the decentered lens 12A is a decentered D-cut lens whose outer periphery is adjacent to the decentered lens 12B and is D-cut. In addition, the decentered lens 12B is a decentered D-cut lens whose outer periphery is adjacent to the decentered lens 12A and is D-cut. Alternatively, only one of the decentered lenses 12A and 12B may be D-cut.

[0077] In some embodiments, the processed surface of the decentered lens 12A is arranged to be in contact with the processed surface of the decentered lens 12B. In some embodiments, the processed surface of the decentered lens 12A is arranged to be spaced apart from the processed surface of the decentered lens 12B by a predetermined interval.

[0078] (Slit 22)

[0079] The slit (fundus slit) 22 (specifically, an opening described later) can be arranged at a position (fundus conjugate position) that is substantially optically conjugate with the fundus Ef of the subject's eye E. For example, the slit 22 has an opening (slit-shaped opening) in a direction corresponding to a line direction (row direction) read from an image sensor 51 described later in a rolling shutter manner. The opening formed in the slit 22 defines an irradiation pattern of the illumination light on the fundus Ef of the subject's eye E.

[0080] The slit 22 can be moved along the optical axis direction of the illumination optical system 20 by a moving mechanism (moving mechanism 22D described later). The moving mechanism moves the slit 22 along the optical axis direction under the control of a control unit described later. For example, the control unit controls the moving mechanism according to the state of the eye E. Thus, the position of the slit 22 can be moved according to the state of the eye E (specifically, the diopter (refractive power), the shape of the fundus Ef).

[0081] In some embodiments, the slit 22 is configured to be able to change at least one of the position and shape of the opening without moving in the optical axis direction according to the state of the eye E. The function of the slit 22 is realized by, for example, a liquid crystal shutter.

[0082] (Relay lens system RL1, RL2)

[0083] The relay lens system RL1 is arranged between the optical scanner 30 and the slit 22. The relay lens system RL2 is arranged between the slit 22 and the iris diaphragm 21.

[0084] exist Figure 3 The schematic diagram of the structure of the relay lens systems RL1 and RL2 according to the embodiment is shown in FIG. Figure 3 In, with Figure 1The same parts are denoted by the same reference numerals, and the description thereof will be appropriately omitted.

[0085] The relay lens system RL1 includes one or more lenses. A rear focal point position F1 of the relay lens system RL1 is arranged at a position substantially optically conjugate with the iris of the eye E to be inspected.

[0086] As described later, the optical scanner 30 disposed at a position substantially conjugate with the iris of the subject's eye E is disposed at or near the rear focal position F1 of the relay lens system RL1. Therefore, even when the slit 22 moves in the optical axis direction according to the state (diopter) of the subject's eye E, the size of the slit image (image formed by light passing through the opening formed in the slit 22) projected onto the fundus Ef does not change regardless of the state of the subject's eye E. This means that the projection magnification of the slit image onto the fundus Ef does not change even when the slit 22 moves in the optical axis direction.

[0087] That is, by arranging the optical scanner 30 at the rear focal position F1 (or its vicinity) of the relay lens system RL1, the relay lens system RL1, the relay lenses 41, 44 and the objective lens 46 constitute a Badal optical system (see Figure 1 ).

[0088] Thus, regardless of the state (diopter, etc.) of the subject's eye E, the projection angle of view (projection magnification) of the slit image relative to the visual axis of the subject's eye E (the long side direction and the short side direction of the slit 22) can be fixed. As a result, regardless of the state of the subject's eye E, the size of the slit image does not change, so the deflection operating speed of the optical scanner 30 can be fixed, thereby simplifying the control of the optical scanner 30.

[0089] Furthermore, regardless of the state of the eye E (diopter, etc.), the projection angle of view (projection magnification) of the slit image relative to the visual axis of the eye E is constant, so the light intensity of the slit image at the fundus Ef can be constant.

[0090] Furthermore, when an image is acquired at a predetermined imaging angle of view in the ophthalmologic apparatus, since the projection magnification is fixed as described above, there is no need to provide a margin in the length in the longitudinal direction of the slit 22 provided for acquiring a slit image of a predetermined size.

[0091] In addition, similarly to the relay lens system RL1, the relay lens system RL2 includes one or more lenses. An iris diaphragm 21 (aperture) is arranged at the front focal position F2 of the relay lens system RL2 or in the vicinity thereof.

[0092] As described above, the rear focal position F1 of the relay lens system RL1 and the front focal position F2 of the relay lens system RL2 are positions that are substantially optically conjugate with the iris of the subject's eye. Therefore, the projection magnification from the iris diaphragm 21 to the optical scanner 30 (arranged at the rear focal position F1) is determined by the focal length fa of the relay lens system RL1 and the focal length fb of the relay lens system RL2. At this time, the projection magnification is (fa / fb).

[0093] The ophthalmic device 1 needs to form an image of the iris diaphragm 21 of a predetermined size on the iris of the eye E to be inspected. When the projection magnification from the iris of the eye E to the optical scanner 30 via the objective lens 46 is a known projection magnification, the image of the iris diaphragm 21 of a predetermined size may be projected onto the optical scanner 30. At this time, the projection magnification from the iris diaphragm 21 to the optical scanner 30 is determined by the focal length fa of the relay lens system RL1 and the focal length fb of the relay lens system RL2. Therefore, by changing at least one of the focal lengths fa and fb, it is possible to easily form an image of the iris diaphragm 21 of a predetermined size on the iris of the eye E to be inspected. In some embodiments, only the focal length fb is changed while the focal length fa is fixed.

[0094] The focal length fa is the synthetic focal length of the relay lens system RL1. In some embodiments, the relay lens system RL1 includes a plurality of lenses with different refractive powers, and the focal length fa is changed by changing at least one of the lenses constituting the relay lens system RL1. In some embodiments, at least one of the lenses constituting the relay lens system RL1 is a lens with a changeable refractive power. Examples of lenses with a changeable focal length include liquid crystal lenses, liquid lenses, Alvarez lenses, and the like. Even when the focal length fa is changed, the rear focus position of the relay lens system RL1 is arranged at a position that is substantially optically conjugate with the iris of the eye E to be examined.

[0095] The focal length fb is the synthetic focal length of the relay lens system RL2. In some embodiments, the relay lens system RL2 includes a plurality of lenses having different refractive powers, and the focal length fb is changed by changing at least one of the lenses constituting the relay lens system RL2. In some embodiments, at least one of the lenses constituting the relay lens system RL2 is a lens with a changeable refractive power. Even when the focal length fb is changed, the front focus position of the relay lens system RL2 is configured at a position that is substantially optically conjugate with the iris of the eye E to be inspected.

[0096] In addition, in order to photograph the fundus Ef, a light source that emits high-brightness light is desired. However, the size of the light-emitting surface (light-emitting area, output beam cross-sectional size) of generally available light sources (mass-produced light sources) is limited, and the image of the iris diaphragm 21 needs to be projected onto the optical scanner 30 at a projection magnification corresponding to the size of the light-emitting surface of the light source.

[0097] According to the first embodiment, the projection magnification from the iris diaphragm 21 to the optical scanner 30 can be changed by changing at least one of the focal lengths fa and fb, so that an image of the iris diaphragm 21 of any size can be projected onto the optical scanner 30 at a desired size. Thus, even when the size of the light emitting surface of the light source is different, an image of the iris diaphragm 21 of a desired size can be projected onto the optical scanner 30 by changing only at least one of the focal lengths fa and fb, thereby improving the degree of freedom in designing the optical system. In particular, by fixing the focal length fa and changing only the focal length fb, the amount of movement of the slit 22 with respect to the change in the diopter of the eye E to be inspected (the sensitivity of the movement of the slit 22 with respect to the change in the diopter) can be fixed, and the degree of freedom in designing the optical system can be further improved.

[0098] In addition, Figure 1 In the structure, the effective diameter of one or more lenses constituting the relay lens system RL1 can be reduced.

[0099] The reason is that a slit 22 is arranged between the optical scanner 30 and the iris diaphragm 21, and the slit 22 is arranged at a position that is substantially optically conjugate with the fundus Ef of the eye E to be inspected. The slit 22 can move along the optical axis direction in accordance with the diopter of the eye E to be inspected. Here, the projection magnification from the iris diaphragm 21 to the optical scanner 30 is determined by the first distance between the optical scanner 30 and the relay lens system RL1 and the second distance between the iris diaphragm 21 and the relay lens system RL1, so when the first distance is shortened, the second distance also needs to be shortened. However, it is necessary to maintain the conjugate relationship with the iris and the conjugate relationship with the fundus Ef while ensuring the moving space in the optical axis direction of the slit 22, so the first distance becomes longer and the effective diameter of the relay lens system RL1 becomes larger. According to this embodiment, by providing the relay lens system RL2, the first distance is shortened, and the projection magnification can also be adjusted using the relay lens system RL2. Thus, while ensuring the movement space of the slit 22 in the optical axis direction and maintaining the conjugate relationship with the iris and the fundus Ef, the first distance can be shortened, thereby reducing the effective diameter of one or more lenses constituting the relay lens system RL1.

[0100] Furthermore, since the effective diameter of one or more lenses constituting the relay lens system RL1 can be reduced, the length of the optical system from the optical scanner 30 to the light source 10 can be reduced.

[0101] In such an illumination optical system 20, light emitted from the light source 10 passes through the condenser lens 11, passes through the decentered lenses 12A and 12B, and passes through the openings 21A and 21B formed in the iris diaphragm 21. The light passing through the openings 21A and 21B formed in the iris diaphragm 21 passes through the relay lens system RL2, passes through the opening formed in the slit 22, and is output as slit-shaped illumination light. The slit-shaped illumination light passes through the relay lens system RL1 and is guided to the optical scanner 30.

[0102] (Optical Scanner 30)

[0103] The optical scanner 30 can be arranged at a position that is substantially optically conjugate with the iris of the subject's eye E. The optical scanner 30 deflects the slit-shaped illumination light (the slit-shaped light that passes through the opening formed in the slit 22) that has passed through the relay lens system RL1. Specifically, the optical scanner 30 deflects the slit-shaped illumination light that sequentially illuminates a predetermined illumination range of the fundus Ef while changing the deflection angle within a predetermined deflection angle range with the iris of the subject's eye E or its vicinity as the scanning center position, and guides the slit-shaped illumination light to the projection optical system 35. The optical scanner 30 can deflect the illumination light one-dimensionally or two-dimensionally.

[0104] In the case of one-dimensional deflection, the optical scanner 30 includes a galvanometer that deflects the illumination light within a predetermined deflection angle range based on a predetermined deflection direction. In the case of two-dimensional deflection, the optical scanner 30 includes a first galvanometer and a second galvanometer. The first galvanometer deflects the illumination light in a manner that moves the irradiation position of the illumination light in a horizontal direction orthogonal to the optical axis of the illumination optical system 20. The second galvanometer deflects the illumination light deflected by the first galvanometer in a manner that moves the irradiation position of the illumination light in a vertical direction orthogonal to the optical axis of the illumination optical system 20.

[0105] (Projection optical system 35)

[0106] The projection optical system 35 guides the illumination light deflected by the optical scanner 30 to the fundus Ef of the eye to be inspected E. In the first embodiment, the projection optical system 35 guides the illumination light deflected by the optical scanner 30 to the fundus Ef via an optical path coupled with the optical path of the photographing optical system 40 through an aperture mirror 45 as an optical path coupling component described later.

[0107] The projection optical system 35 includes a relay lens 41, a black spot plate 42, a reflection mirror 43, and a relay lens 44. The relay lenses 41 and 44 each include one or more lenses.

[0108] (Black dot board 42)

[0109] The black spot plate 42 can be disposed at a position that is substantially optically conjugate with the lens surface of the objective lens 46 or its vicinity. This can prevent the reflected light from the lens surface of the objective lens 46 from being guided to the light source 10.

[0110] In such a projection optical system 35 , the illumination light deflected by the optical scanner 30 passes through the relay lens 41 , passes through the black spot plate 42 , is reflected by the reflection mirror 43 toward the relay lens 44 , passes through the relay lens 44 , and is guided to the aperture mirror 45 .

[0111] (Photographic Optical System 40)

[0112] The photographing optical system 40 guides the illumination light guided from the projection optical system 35 to the fundus Ef of the eye to be inspected E, and guides return light of the illumination light from the fundus Ef to the photographing device 50 .

[0113] The optical path of the illumination light from the projection optical system 35 is coupled to the optical path of the return light of the illumination light from the fundus Ef in the imaging optical system 40. By using the aperture mirror 45 as an optical path coupling member for coupling these optical paths, the illumination light and the return light can be pupil-divided.

[0114] The photographing optical system 40 includes an aperture lens 45, a focus lens 47, a relay lens 48, and an imaging lens 49. The relay lens 48 may include one or more lenses.

[0115] (Aperture Mirror 45)

[0116] The aperture mirror 45 is formed with an aperture portion disposed on the optical axis of the photographing optical system 40. The aperture portion of the aperture mirror 45 can be disposed at a position that is substantially optically conjugate with the iris of the subject's eye E. The aperture mirror 45 reflects the illumination light from the projection optical system 35 toward the objective lens 46 in the peripheral area of ​​the aperture portion. Such an aperture mirror 45 functions as a photographing aperture.

[0117] In addition, the aperture mirror 45 functions as an optical path coupling component that couples the optical path of the illumination light passing through the slit 22 with the optical path of the return light from the fundus Ef. That is, the aperture mirror 45 is configured to couple the optical path of the illumination optical system 20 (projection optical system 35) with the optical path of the photographing optical system 40 arranged in the direction of the optical axis passing through the aperture, and guides the illumination light reflected in the peripheral area of ​​the aperture to the fundus Ef. In other words, the aperture mirror 45 can be arranged at a position that is substantially optically conjugate with the iris of the subject's eye E, and separates the optical path of the return light of the illumination light into the optical path of the illumination optical system and the optical path of the photographing optical system.

[0118] (Focus lens 47)

[0119] The focus lens 47 can be moved along the optical axis direction of the photographing optical system 40 by a moving mechanism (moving mechanism 47D described later) not shown in the figure. The moving mechanism moves the focus lens 47 along the optical axis direction under the control of a control unit described later. Thus, according to the state of the eye E to be inspected, the return light of the illumination light passing through the aperture of the aperture mirror 45 can be imaged on the light receiving surface of the image sensor 51 of the photographing device 50.

[0120] Instead of the focus lens 47, a known variable focus lens such as a liquid lens, a variable focus lens system in which one or more positive lenses and one or more negative lenses are combined, an Alvarez lens, or a liquid crystal lens may be provided.

[0121] In such a photographing optical system 40, the illumination light from the projection optical system 35 is reflected toward the objective lens 46 in the peripheral area of ​​the hole portion formed in the aperture mirror 45. The illumination light reflected in the peripheral area of ​​the aperture mirror 45 is refracted by the objective lens 46, passes through the pupil of the subject's eye E, enters the eye, and illuminates the fundus Ef of the subject's eye E.

[0122] The return light of the illumination light from the fundus Ef is refracted by the objective lens 46 , passes through the aperture of the aperture mirror 45 , passes through the focus lens 47 , passes through the relay lens 48 , and is imaged by the imaging lens 49 onto the light receiving surface of the image sensor 51 of the imaging device 50 .

[0123] (Photographing device 50)

[0124] The imaging device 50 includes an image sensor 51 that receives return light of the illumination light guided from the fundus Ef of the eye E to be inspected by the imaging optical system 40. The imaging device 50 can read out the light reception result of the return light under the control of a control section described later.

[0125] (Image sensor 51)

[0126] The image sensor 51 functions as a pixelated photoreceptor. The light receiving surface (detection surface, imaging surface) of the image sensor 51 can be arranged at a position that is substantially optically conjugate with the fundus Ef.

[0127] The light-receiving result of the image sensor 51 is read out by a rolling shutter method under the control of a control unit described later.

[0128] Such an image sensor 51 includes a CMOS image sensor. In this case, the image sensor 51 includes a plurality of pixels (photosensitive elements) arranged in a row direction and a plurality of pixels arranged in a column direction. Specifically, the image sensor 51 includes a plurality of pixels arranged in two dimensions, a plurality of vertical signal lines, and a horizontal signal line. Each pixel includes a photodiode (photosensitive element) and a capacitor. A plurality of vertical signal lines are provided according to each pixel group in a column direction (vertical direction) orthogonal to the row direction (horizontal direction). Each vertical signal line is selectively electrically connected to a pixel group that accumulates a charge corresponding to the photosensitive result. The horizontal signal line is selectively electrically connected to a plurality of vertical signal lines. Each pixel accumulates a charge corresponding to the photosensitive result of the return light, and the accumulated charge is read out in sequence, for example, according to each pixel group in the row direction. For example, according to each row in the row direction, a voltage corresponding to the charge accumulated to each pixel is provided to the vertical signal line. A plurality of vertical signal lines are selectively electrically connected to the horizontal signal line. The reading operation for each row in the row direction is sequentially performed in the vertical direction, thereby making it possible to read out the light-sensing results of a plurality of pixels arranged two-dimensionally.

[0129] By taking in (reading out) the light-receiving result of the return light in a rolling shutter manner to such an image sensor 51, a light-receiving image corresponding to a desired virtual opening shape extending in the row direction is acquired. Such control is disclosed in, for example, US Pat. No. 8,237,835.

[0130] Figure 4 FIG. 2 is a diagram for explaining the operation of the ophthalmologic apparatus 1 according to the embodiment. Figure 4 Schematically shows an irradiation range IP of the slit-shaped illumination light irradiated to the fundus Ef and a virtual opening range OP on the light receiving surface SR of the image sensor 51 .

[0131] For example, the control unit described later deflects the slit-shaped illumination light formed by the illumination optical system 20 using the optical scanner 30. Thus, in the fundus Ef, the irradiation range IP of the slit-shaped illumination light sequentially moves in a direction (e.g., vertical direction) orthogonal to the slit direction (e.g., row direction, horizontal direction).

[0132] On the light receiving surface SR of the image sensor 51, the pixel of the readout object is changed in row units by the control unit described later, thereby setting a virtual opening range OP. The opening range OP is expected to be the light receiving range IP' of the return light of the illumination light on the light receiving surface SR or a range larger than the light receiving range IP'. The control unit described later performs the movement control of the opening range OP in synchronization with the movement control of the irradiation range IP of the illumination light. As a result, it is possible to obtain a high-quality image of the fundus Ef with a strong contrast without being affected by unnecessary scattered light with a simple structure.

[0133] exist Figure 5 and Figure 6 Schematically shows an example of the control timing of the rolling shutter method for the image sensor 51. Figure 5 An example of the timing of the readout control for the image sensor 51 is shown. Figure 6 The timing of moving the illumination light irradiation range IP (light receiving range IP') is superimposed on Figure 5 The timing of the readout control is shown in the figure. Figure 5 and Figure 6 In FIG. 5 , the horizontal axis represents the number of rows of the image sensor 51 and the vertical axis represents time.

[0134] In addition, Figure 5 and Figure 6 In the embodiment, for the sake of convenience, the number of rows of the image sensor 51 is set to 1920, but the structure involved in the embodiment is not limited to the number of rows. Figure 6 In the figure, for the sake of convenience of explanation, the slit width (width in the row direction) of the slit-shaped illumination light is set to 40 rows.

[0135] The readout control in the row direction includes reset control, exposure control, charge transfer control, and output control. Reset control is a control to initialize the amount of charge accumulated in the pixels in the row direction. Exposure control is a control to irradiate light to the photodiode and accumulate the charge corresponding to the amount of light received in the capacitor. Charge transfer control is a control to transfer the amount of charge accumulated in the pixel to the vertical signal line. Output control is a control to output the amount of charge accumulated in the multiple vertical signal lines via the horizontal signal line. That is, Figure 5 As shown, the readout time T of the charge amount accumulated in the pixels in the row direction is the sum of the reset control required time Tr, the exposure control required time (exposure time) Te, the charge transfer control required time Tc, and the output control required time Tout.

[0136] exist Figure 5 In the example, by shifting the readout start timing (start timing of time Tc) in units of rows, the light-sensing results (charge amounts) of pixels in a desired range accumulated in the image sensor 51 are obtained. Figure 5 When the pixel range shown is an image corresponding to one frame, the frame rate FR is uniquely determined.

[0137] In the present embodiment, the irradiation position of the fundus Ef with the illumination light having a slit width corresponding to a plurality of rows is sequentially shifted in the direction corresponding to the column direction at the fundus Ef.

[0138] For example Figure 6As shown, the illumination light is shifted in the direction corresponding to the column direction in row units at the irradiation position of the fundus Ef every predetermined shift time Δt. The shift time Δt (Δt=Te / 40) is obtained by dividing the exposure time Te of the pixels in the image sensor 51 by the slit width of the illumination light (for example, 40). In synchronization with the movement timing of the irradiation position, the readout start timing of each row of pixels is delayed and started every row by the shift time Δt unit. As a result, a high-quality image of the fundus Ef with a strong contrast can be obtained in a simple control and in a short time.

[0139] In some embodiments, the image sensor 51 is composed of more than one line sensor.

[0140] (Camera 60A, 60B)

[0141] Cameras 60A and 60B photograph the face of the subject substantially simultaneously from different directions. The face of the subject has a peripheral area of ​​the eye E including the anterior ocular portion of the eye E. The peripheral area of ​​the eye E only needs to include the peripheral part of the eye E. Examples of the peripheral part of the eye E include the nose of the subject, the eyebrows of the subject, the forehead of the subject, etc. In the first embodiment, cameras 60A and 60B are provided on a side of the subject of the housing (device body) that accommodates the optical system of the ophthalmic device 1. In addition, cameras 60A and 60B are arranged at a position deviating from the optical axis of the objective lens 46.

[0142] In some embodiments, cameras 60A and 60B respectively include a camera for photographing the anterior segment of the eye E to be inspected and a camera for photographing the peripheral area of ​​the eye E to be inspected, and are configured to switch the cameras according to photographing the anterior segment of the eye E to be inspected and photographing the peripheral area of ​​the eye E to be inspected (the face of the subject).

[0143] In the first embodiment, although two cameras 60A and 60B are provided, the number of cameras involved in the first embodiment is any number greater than two. In addition, in the first embodiment, the illumination optical system 20 and the photographing optical system 40 are separately provided with cameras 60A and 60B, but at least the photographing optical system 40 can be used to perform the same anterior ocular photography. That is, it can also be configured so that one function of more than two cameras is realized by the photographing optical system 40. In short, in the first embodiment, it is sufficient to be configured so that the peripheral area of ​​the subject's eye E including the anterior ocular portion of the subject's eye E can be photographed substantially simultaneously from two different directions (more than two directions).

[0144] Furthermore, in the case where the anterior segment of the subject's eye E and the peripheral area of ​​the subject's eye E are photographed simultaneously, "substantially simultaneously" means that the deviation of the photographing timing to the extent that the eye movement can be ignored is allowed in the photographing performed using two or more cameras. Furthermore, in the case where the anterior segment of the subject's eye E and the peripheral area of ​​the subject's eye E are photographed at different times, "substantially simultaneously" means that the deviation of the photographing timing to the extent that the eye movement can be ignored is allowed in the photographing of the anterior segment performed using two or more cameras, and also means that the deviation of the photographing timing to the extent that the facial movement of the subject can be ignored is allowed in the photographing of the peripheral area of ​​the subject's eye E performed using two or more cameras. Thus, it is possible to obtain images when the subject's eye E and the subject's face are in substantially the same position (orientation) using two or more cameras.

[0145] In addition, the shooting performed using two or more cameras can be either moving image shooting or still image shooting. In the case of moving image shooting, the above-mentioned substantially simultaneous shooting can be achieved by controlling the shooting start timing to be consistent or controlling the frame rate and the shooting timing of each frame. On the other hand, in the case of still image shooting, these can be achieved by controlling the shooting timing to be consistent.

[0146] The ophthalmic device 1 uses cameras 60A and 60B to capture two images with parallax substantially at the same time. The ophthalmic device 1 uses the two positions of each of the two or more characteristic parts in the peripheral area of ​​the subject's eye E depicted in the two acquired images and applies a known triangulation method to determine the three-dimensional position of each of the two or more characteristic parts in the peripheral area of ​​the subject's eye E. The ophthalmic device 1 determines the three-dimensional shape of the subject's face based on the three-dimensional positions of the two or more characteristic parts, and uses the determined three-dimensional shape to determine whether a part of the device is in contact with a predetermined part of the subject's face (the subject's eye E, a part of the peripheral area of ​​the subject's eye E).

[0147] When it is determined that a part of the device is not in contact with a predetermined part of the face of the subject, the ophthalmic device 1 uses the two positions of the characteristic parts in the anterior ocular segment depicted in the two acquired images and applies a known triangulation method to determine the three-dimensional position of the characteristic parts in the anterior ocular segment. The ophthalmic device 1 uses the determined three-dimensional position of the characteristic parts to align the device optical system 70 with the subject's eye E. At this time, the device optical system 70 is moved in such a way that the distance between the subject's eye E and the objective lens 46 (e.g., lens surface) in the optical axis direction (Z direction) of the objective lens 46 becomes a predetermined working distance WD0 predetermined according to the structure of the optical system constituting the ophthalmic device 1.

[0148] On the other hand, when it is determined that a part of the device is in contact with a predetermined part of the face of the subject, the ophthalmic device 1 moves the device optical system 70 in the XY direction in the same manner as described above, and moves the device optical system 70 in the Z direction in such a manner that the part of the device is not in contact with the predetermined part of the face of the subject. That is, the ophthalmic device 1 moves the device optical system 70 in such a manner that the distance between the eye E to be examined and the objective lens 46 in the optical axis direction of the objective lens 46 is longer than the above-mentioned working distance WD0 by the adjustment distance dz. Thereafter, the ophthalmic device 1 adjusts the conjugate relationship within the optical system by moving the moving optical system 80 relative to the objective lens 46 in the optical axis direction of the objective lens 46, thereby compensating for displacement in the Z direction corresponding to the adjustment distance dz. Furthermore, the ophthalmic device 1 can adjust the diopter by moving the focus lens 47 in the optical axis direction according to the movement amount of the moving optical system 80. In some embodiments, the ophthalmologic apparatus 1 performs diopter adjustment by moving the focus lens 47 once in the optical axis direction according to the diopter of the eye E to be inspected and the movement amount of the moving optical system 80 .

[0149] [Control system structure]

[0150] like Figure 7 As shown, the control system of the ophthalmologic apparatus 1 is configured with the control unit 100 as the center. In addition, at least a part of the configuration of the control system may be included in the ophthalmologic apparatus 1.

[0151] (Control Unit 100)

[0152] The control unit 100 controls each unit of the ophthalmologic apparatus 1. The control unit 100 includes a main control unit 101 and a storage unit 102. The main control unit 101 includes a processor, and executes processing according to a program stored in the storage unit 102 to perform control processing of each unit of the ophthalmologic apparatus 1.

[0153] (Main control unit 101)

[0154] The main control unit 101 controls the illumination optical system 20 , the optical scanner 30 , the photographing optical system 40 , the photographing device 50 , the cameras 60A and 60B, the first moving mechanism 70D, the second moving mechanism 80D, and the data processing unit 200 .

[0155] The control of the illumination optical system 20 includes the control of the light source 10 and the control of the moving mechanism 22D. The control of the light source 10 includes the control of turning on and off the light source (or switching the wavelength range of the light) and changing the light amount of the light source. The moving mechanism 22D moves the slit 22 along the optical axis direction of the illumination optical system 20. The main control unit 101 controls the moving mechanism 22D according to the state of the eye E to be inspected, and arranges the slit 22 at a position corresponding to the state of the eye E to be inspected. The state of the eye E includes the shape of the fundus Ef, the diopter, the axial length of the eye, and the like. For example, the diopter can be obtained from a known eye refractive power measuring device disclosed in Japanese Patent Publication No. 61-293430 or Japanese Patent Publication No. 2010-259495. The axial length of the eye can be obtained from the measurement value of a known axial length measuring device or an optical coherence tomography imager.

[0156] For example, first control information in which the position of the slit 22 on the optical axis of the illumination optical system 20 is preliminarily associated with the diopter is stored in the storage unit 102. The main control unit 101 determines the position of the slit 22 corresponding to the diopter by referring to the first control information, and controls the moving mechanism 22D to arrange the slit 22 at the determined position.

[0157] In some embodiments, as the slit 22 moves, the main control unit 101 changes the position and orientation of the light source 10 in accordance with the change in the light quantity distribution of the light passing through the opening formed in the slit 22. In some embodiments, as the slit 22 moves, the main control unit 101 changes the position and orientation of at least one of the decentered lenses 12A and 12B in accordance with the change in the light quantity distribution of the light passing through the opening formed in the slit 22.

[0158] The control of the optical scanner 30 includes the control of the scanning range (scanning start position and scanning end position), the control of the scanning speed, the control of the scanning mode, etc. Examples of the scanning mode (a scanning method for moving the irradiation position of the illumination light of the optical scanner 30) include horizontal scanning, vertical scanning, cross scanning, radial scanning, circular scanning, concentric scanning, spiral scanning, etc.

[0159] The control of the photographing optical system 40 includes the control of the moving mechanism 47D. The moving mechanism 47D moves the focus lens 47 along the optical axis direction of the photographing optical system 40 (objective lens 46). The main control unit 101 can control the moving mechanism 47D based on the analysis result of the image acquired by the image sensor 51 or the data processing result obtained by the data processing unit 200. In addition, the main control unit 101 can control the moving mechanism 47D using the operation unit 110 described later according to the user's operation content.

[0160] The control of the imaging device 50 includes the control of the image sensor 51 (rolling shutter control). The control of the image sensor 51 includes reset control, exposure control, charge transfer control, and output control. In addition, the reset control required time Tr, the exposure control required time (exposure time) Te, the charge transfer control required time Tc, and the output control required time Tout can be changed.

[0161] The first moving mechanism 70D moves the device optical system 70 three-dimensionally relative to the subject's eye E. That is, the first moving mechanism 70D is configured to move the device optical system 70 in the X direction, the Y direction, and the Z direction. For example, the first moving mechanism 70D includes a first holding member (stage, frame) for holding the device optical system 70 and a first driving unit (motor) for driving the first holding member, and the first driving unit is configured to drive the first holding member according to a control signal from the main control unit 101.

[0162] For example, the control of the first moving mechanism 70D by the main control unit 101 is used for alignment (positioning) and tracking of the subject's eye E by the optical system. Tracking refers to moving the device optical system 70 in accordance with the movement of the subject's eye E. When tracking is performed, alignment and focusing are performed in advance. Tracking refers to a function of moving the device optical system 70 in real time in accordance with the position and direction of the subject's eye E based on an image obtained by capturing a moving image of the subject's eye E, thereby maintaining an appropriate positional relationship for alignment and focusing.

[0163] In some embodiments, the main control unit 101 corrects the position of the irradiation range of the illumination light in the fundus Ef in real time based on the tracking information obtained by the tracking control (tracking information obtained by making the optical system follow the movement of the eye E). The main control unit 101 can control the light scanner 30 so that the corrected irradiation range is scanned by the illumination light.

[0164] The second moving mechanism 80D moves the moving optical system 80 relative to the objective lens 46. The second moving mechanism 80D is configured to move the moving optical system 80 along the optical axis direction of the objective lens 46. In some embodiments, the second moving mechanism 80D is configured to move the moving optical system 80 along the X direction, the Y direction, and the Z direction including the optical axis direction of the objective lens 46.

[0165] For example, the second moving mechanism 80D is configured to include a second holding member (stage, frame) for holding the movable optical system 80 and a second driving unit (motor) for driving the second holding member, and the second driving unit is configured to drive the second holding member according to a control signal from the main control unit 101. The second holding member is configured to be movable on the first holding member.

[0166] The control of the data processing unit 200 includes various image processing and analysis processing of the photosensitive results obtained from the image sensor 51. The image processing includes noise removal processing of the photosensitive results and brightness correction processing for easily identifying a predetermined part depicted in the photosensitive image based on the photosensitive results. The analysis processing includes focus state determination processing, etc.

[0167] The data processing unit 200 can form a light-sensitive image corresponding to an arbitrary aperture range based on the light-sensitive result read from the image sensor 51 by the rolling shutter method under the control of the main control unit 101 (control unit 100). The data processing unit 200 can sequentially form light-sensitive images corresponding to the aperture range, and form an image of the subject's eye E based on the formed plurality of light-sensitive images.

[0168] In addition, the data processing unit 200 can determine whether a part of the device is in contact with a predetermined part of the subject's face based on the two images obtained by the cameras 60A and 60B, and determine the movement target position of the device optical system 70 based on the obtained determination result.

[0169] Figure 8 Show Figure 7 A block diagram of a structural example of the data processing unit 200.

[0170] The data processing unit 200 includes a three-dimensional shape data generating unit 210 , a contact determining unit 220 , a movement target position determining unit 230 , and an optical relationship adjustment amount determining unit 240 .

[0171] (Three-dimensional shape data generating unit 210)

[0172] The three-dimensional shape data generating unit 210 generates three-dimensional shape data representing the three-dimensional shape of the subject's face using the two images obtained by the cameras 60A and 60B. In some embodiments, the three-dimensional shape data of the subject's face is three-dimensional shape data representing the three-dimensional shape of the peripheral area of ​​the subject's eye E.

[0173] In each of the two images acquired by the cameras 60A and 60B, two or more characteristic parts of the subject's face including two or more characteristic parts of the peripheral area of ​​the subject's eye E are depicted. For example, with respect to each of the two or more characteristic parts, the three-dimensional shape data generating unit 210 uses the two positions of the characteristic parts depicted in the two acquired images and applies a known triangulation method to determine the three-dimensional position of the characteristic parts. For example, by selecting the characteristic parts in a grid shape along each of the X direction, the Y direction, and the Z direction, the three-dimensional shape data generating unit 210 can generate three-dimensional shape data consisting of the coordinate positions of the three-dimensional positions of a plurality of characteristic parts.

[0174] In some embodiments, the three-dimensional shape data generating unit 210 further performs a known interpolation process such as spline interpolation or Lagrange interpolation on the three-dimensional positions of the determined N (N is an integer greater than 2) feature parts, thereby generating three-dimensional shape data consisting of the coordinate positions of M (M is an integer greater than N) three-dimensional positions in a grid shape.

[0175] (Contact determination unit 220)

[0176] The contact determination unit 220 uses the three-dimensional shape data generated by the three-dimensional shape data generation unit 210 to determine whether a part of the ophthalmic device 1 is in contact with a predetermined part of the subject's face (the subject's eye E, a part of the peripheral area of ​​the subject's eye E) when the subject's eye E is configured at the device's inherent measurement position.

[0177] Specifically, in the ophthalmic device 1, the outer shape data indicating the outer shape of the device (housing) and the working distance at which the fundus Ef can be photographed at the maximum viewing angle in a state where the part of the device is not in contact with the predetermined part of the face of the subject are known. The contact determination unit 220 determines whether the part of the device is in contact with the predetermined part of the face of the subject when the eye E to be examined is arranged at the known working distance, based on the three-dimensional shape data of the face of the subject, the known outer shape data of the ophthalmic device 1, and the known working distance.

[0178] For example, the contact determination unit 220 performs contact determination processing in a predetermined three-dimensional coordinate system in the X direction, the Y direction, and the Z direction, with the reference position in the ophthalmic device 1 as the origin. In the contact determination processing, for example, when the position in the Z direction (Z position) is set to the known working distance, it is determined whether the face of the subject overlaps with the ophthalmic device 1 based on the three-dimensional shape data of the face of the subject and the known external shape data of the ophthalmic device 1.

[0179] (Movement Target Position Determining Unit 230)

[0180] The movement target position determination section 230 determines the movement target position of the apparatus optical system 70 relative to the eye E to be inspected, based on the determination result obtained by the contact determination section 220 .

[0181] Specifically, when it is determined that the part of the device is not in contact with the predetermined part of the face of the subject, the moving target position determination unit 230, for example, as disclosed in Japanese Patent Publication No. 2013-248376, uses two positions of the characteristic parts of the anterior ocular part depicted in the two images acquired by the cameras 60A and 60B and applies a known triangulation method to determine the three-dimensional position of the characteristic parts in the anterior ocular part. Examples of characteristic parts include the centroid position or center position of the pupil area. The corneal vertex position can be estimated as a position in front of the centroid position or center position of the pupil area in the Z direction at a predetermined distance. The predetermined distance can be determined based on the data of the model eye or the statistical data obtained from a plurality of eyes. The moving target position determination unit 230 determines the position where the optical axis of the objective lens 46 (device optical system 70) is roughly consistent with the axis (visual axis) of the subject's eye E and the distance of the objective lens 46 to the subject's eye E (pupil area or corneal vertex position) becomes a predetermined working distance WD0 (first working distance) as the moving target position Tp.

[0182] When it is determined that the device part is not in contact with the predetermined part of the subject's face, the main control unit 101 controls a first moving mechanism 70D described later to move the device optical system 70 so that the position of the subject's eye E becomes the movement target position Tp.

[0183] On the other hand, when it is determined that a part of the device is in contact with a predetermined part of the subject's face, the moving target position determination unit 230 obtains a moving target position Tp1 that is away from the moving target position Tp by a predetermined adjustment distance dz in the optical axis direction of the objective lens 46. That is, the component in the Z direction corresponding to the optical axis direction of the objective lens 46 is Tp1(Z)=Tp(Z)+dz. As a result, the working distance becomes a working distance WD1 (second working distance) that is greater than the predetermined working distance WD0.

[0184] For example, the moving target position determination unit 230 determines the Z position of the face of the subject closest to the ophthalmic device 1 (the position in the optical axis direction of the objective lens 46) based on the three-dimensional shape data of the face of the subject generated by the three-dimensional shape data generation unit 210. Examples of the Z position of the face of the subject closest to the ophthalmic device 1 include the Z position of the nose of the subject, the Z position of the eyebrows of the subject, and the Z position of the forehead of the subject. The moving target position determination unit 230 obtains the adjustment amount in the optical axis direction of the objective lens 46 that is not in contact with the ophthalmic device 1 as the shortest adjustment distance dz relative to the predetermined working distance WD0. The adjustment distance dz is the adjustment amount in the direction away from the objective lens 46 in the optical axis direction of the objective lens 46.

[0185] In some embodiments, the movement target position determination unit 230 obtains the adjustment distance dz using a predetermined calculation formula that uses the Z position of the subject's face closest to the ophthalmic apparatus 1 as a variable.

[0186] In some embodiments, the storage unit 102 or a storage unit (not shown) pre-stores correspondence information of a plurality of adjustment distances dz corresponding to each of a plurality of Z positions of the face of the subject closest to the ophthalmic apparatus 1. The movement target position determination unit 230 obtains the adjustment distance dz from the Z position of the face of the subject closest to the ophthalmic apparatus 1 by referring to the correspondence information.

[0187] In some embodiments, the target position determination unit 230 obtains a predetermined fixed value as the adjustment distance dz.

[0188] When it is determined that a part of the device is in contact with a predetermined part of the subject's face, the main control unit 101 controls a first moving mechanism 70D described later to move the device optical system 70 relative to the subject's eye E to a movement target position Tp1.

[0189] (Optical Relationship Adjustment Amount Determining Unit 240)

[0190] When it is determined that a part of the device is in contact with a predetermined part of the face of the subject, the optical relationship adjustment amount determination unit 240 determines an adjustment amount for adjusting the deviation of the optical relationship in the optical system of the ophthalmic device 1. The adjustment amount for adjusting the deviation of the optical relationship of the optical system includes an adjustment amount for adjusting the deviation of the optical conjugate relationship of the optical system and an adjustment amount for adjusting the deviation of the focal position of the focus lens 47.

[0191] The above-mentioned moving target position Tp is a position where the fundus Ef of the subject's eye E can be photographed at the maximum angle of view under the optimal optical conditions predetermined in the ophthalmologic apparatus 1. In contrast, the moving target position Tp1 is a position offset by an adjustment distance dz in the optical axis direction of the objective lens 46 relative to the moving target position Tp. Therefore, when the device optical system 70 is arranged at the moving target position Tp1 relative to the subject's eye E, a deviation in the optical conjugate relationship within the ophthalmologic apparatus 1 relative to the subject's eye E and a deviation in the focal position of the focus lens 47 occur. The optical relationship adjustment amount determination unit 240 obtains an adjustment amount for adjusting these optical relationship deviations.

[0192] For example, the optical relationship adjustment amount determination unit 240 obtains an adjustment amount for adjusting a deviation in the optical conjugate relationship of the optical system according to a predetermined calculation formula.

[0193] Here, at a predetermined working distance WD0, the projection magnification of the illumination light of the illumination optical system 20 having the iris diaphragm 21 is set to βi , the synthetic focal length of the illumination optical system is set to f i The optical relationship adjustment amount determination unit 240 determines β i 、f i The adjustment amount z for adjusting the optical conjugate relationship of the optical system is obtained by using the function F shown in the formula (1) with the adjustment distance dz as a variable. ir .

[0194] [Formula 1]

[0195] z ir =F(β i , f i ,dz) (1)

[0196] In addition, the optical magnification of the objective lens 46 is set to β o , the optical magnification of the focus lens 47 is set to β f , the relay magnification in the relay lens 48 and the imaging lens 49 is set to β r , the focal length of the objective lens 46 is set to f o , the focal length of the focus lens 47 is set to f f The optical relationship adjustment amount determination unit 240 sets β o , β f , β r 、f o 、f f , the function G shown in the formula (2) with the adjustment distance dz as a variable and the adjustment amount Z shown in the formula (1) ir , find the adjustment amount z for adjusting the movement amount of the focus lens 47 (the movement amount of the focal position) fr .

[0197] [Formula 2]

[0198] z fr =G(β o , β f , β R , f o , f f , dz)-z ir (2)

[0199] When it is determined that a part of the device is in contact with a predetermined part of the subject's face, the main control unit 101 controls the second moving mechanism 80D described later to move the moving optical system 80 relative to the objective lens 46 along the optical axis direction of the objective lens 46. At this time, the second moving mechanism 80D moves the moving optical system 80 in a direction approaching the objective lens 46 by the adjustment amount z shown in formula (1). ir .

[0200] Similarly, when it is determined that a part of the device is in contact with a predetermined part of the subject's face, the main control unit 101 controls the moving mechanism 47D described later to move the focus lens 47 relative to the objective lens 46 along the optical axis direction. At this time, the moving mechanism 47D moves the focus lens 47 in a direction approaching the objective lens 46 by the adjustment amount z shown in formula (2). fr .

[0201] The data processing unit 200 includes a processor, and performs processing according to a program stored in a storage unit or the like, thereby realizing the above-mentioned functions.

[0202] (Storage Unit 102)

[0203] The storage unit 102 stores various computer programs and data. The computer programs include a calculation program and a control program for controlling the ophthalmologic apparatus 1 .

[0204] (Operation unit 110)

[0205] The operation unit 110 includes an operation device or an input device. The operation unit 110 includes buttons, switches (such as an operation handle, an operation knob, etc.), and operation devices (such as a mouse and a keyboard) provided on the ophthalmic apparatus 1. In addition, the operation unit 110 may also include any operation device or input device such as a trackball, an operation panel, a switch, a button, and a dial.

[0206] (Display unit 120)

[0207] The display unit 120 displays an image of the subject's eye E generated by the data processing unit 200. The display unit 120 includes a display device such as a flat panel display such as an LCD (Liquid Crystal Display). In addition, the display unit 120 may include various display devices such as a touch panel provided in the housing of the ophthalmologic apparatus 1.

[0208] In addition, the operating unit 110 and the display unit 120 do not need to constitute separate devices. For example, a device that integrates the display function and the operating function, such as a touch panel, can also be used. In this case, the operating unit 110 is configured to include the touch panel and a computer program. The operation content of the operating unit 110 is input to the control unit 100 as an electrical signal. In addition, a graphical user interface (GUI) displayed in the display unit 120 and the operating unit 110 can also be used to perform operations and input information. In some embodiments, the functions of the display unit 120 and the operating unit 110 are implemented by a touch screen.

[0209] The illumination optical system 20 is an example of the “illumination system” according to the embodiment. The photographing optical system 40 is an example of the “photographing system” according to the embodiment. The device optical system 70 is an example of the “optical system” according to the embodiment. The focus lens 47 is an example of the “focus position changing component” according to the embodiment. The cameras 60A, 60B and the three-dimensional shape data generating unit 210 are an example of the “shape data acquiring unit” according to the embodiment. The image sensor 51 is an example of the “photographing element” according to the embodiment.

[0210] (Other structures)

[0211] In some embodiments, the ophthalmic device 1 further comprises a fixation projection system. Figure 1 In the structure of the optical system shown, the optical path of the fixation projection system is coupled with the optical path of the photographing optical system 40. The fixation projection system is capable of presenting an internal fixation target or an external fixation target to the eye E to be inspected. In the case of presenting the internal fixation target to the eye E to be inspected, the fixation projection system includes an LCD that displays the internal fixation target under the control of the control unit 100, and projects a fixation light beam output from the LCD to the fundus of the eye E to be inspected. The LCD is configured to be able to change the display position of the fixation target on its screen. By changing the display position of the fixation target in the LCD, the projection position of the fixation target on the fundus of the eye E to be inspected can be changed. By using the operating unit 110, the display position of the fixation target in the LCD can be specified by the user.

[0212] [Work]

[0213] Next, the operation of the ophthalmologic apparatus 1 will be described.

[0214] Figures 9 to 12 The flowchart shows an operation example of the ophthalmologic apparatus 1 according to the first embodiment. The storage unit 102 stores data for implementing Figures 9 to 12 The main control unit 101 operates according to the computer program, thereby executing Figures 9 to 12 Processing shown.

[0215] Before the ophthalmologic apparatus 1 performs wide-angle photography of the fundus Ef of the subject's eye E, the ophthalmologic apparatus 1 performs alignment of the optical system with respect to the subject's eye E. At this time, the ophthalmologic apparatus 1 determines whether the subject's face is in contact with a part of the apparatus, and when it is determined that the subject's face is not in contact with a part of the apparatus, the ophthalmologic apparatus 1 generally performs alignment of the optical system with respect to the subject's eye E. On the other hand, when it is determined that the subject's face is in contact with a part of the apparatus, the ophthalmologic apparatus 1 performs alignment of the optical system with respect to the subject's eye E and adjustment of the optical relationship by the above-described method.

[0216] Next, a fixation target is projected onto the fundus of the eye E to be inspected so as to guide the eye to a desired fixation position using a fixation projection system (not shown).

[0217] (S1: Photographing the subject's face)

[0218] First, the main control unit 101 controls the cameras 60A and 60B to capture the subject's face substantially simultaneously. At this time, the capturing areas of the cameras 60A and 60B include the peripheral areas of the subject's eye E, such as the anterior part, nose, eyes, and eyebrows.

[0219] In some embodiments, the anterior segment photographing of the eye E to be inspected and the peripheral area photographing of the eye E to be inspected are performed sequentially.

[0220] (S2: Generating three-dimensional shape data of the subject's face)

[0221] Next, the main control unit 101 controls the three-dimensional shape data generating unit 210 to generate three-dimensional data of the subject's face based on the two images acquired in step S1 .

[0222] As described above, the three-dimensional shape data generating unit 210 generates three-dimensional data of the subject's face based on the three-dimensional positions of a plurality of characteristic parts such as the subject's nose, eyebrows, and forehead so that the three-dimensional positions of the convex parts of the subject's face can be determined.

[0223] (S3: In contact with the device?)

[0224] Next, the main control unit 101 controls the contact determination unit 220 to determine whether a part of the device is in contact with the face of the subject when the eye E is placed at the measurement position inherent to the device, using the three-dimensional shape data generated in step S2 and the outer shape data of the device. The contact determination unit 220 determines whether a part of the device is in contact with the face of the subject as described above.

[0225] If it is determined in step S3 that the device part is in contact with the subject's face (S3: Yes), the operation of the ophthalmic device 1 moves to step S4. If it is determined in step S3 that the device part is not in contact with the subject's face (S3: No), the operation of the ophthalmic device 1 moves to step S9.

[0226] (S4: Determine the moving target position of the Z target position offset)

[0227] When it is determined in step S3 that part of the device is in contact with the subject's face (S3: Yes), the main control unit 101 controls the target position determination unit 230 to determine the target position Tp1 as the target position offset from the target position in the Z direction (Z target position).

[0228] The target position determination unit 230 obtains the target position Tp and the adjustment distance dz as described above, and determines the target position Tp1.

[0229] (S5: XYZ drive)

[0230] Next, the main control unit 101 controls the first moving mechanism 70D to move the device optical system 70 in the X, Y, and Z directions so that the position of the device optical system 70 relative to the eye E becomes the movement target position Tp1 determined in step S4 .

[0231] (S6: Arrived at the moving target position?)

[0232] The main control unit 101 determines whether the position of the device optical system 70 has reached the movement target position Tp1. In some embodiments, step S6 is executed at a predetermined time interval based on the execution start timing of the process of step S5.

[0233] For example, the main control unit 101 determines whether the position of the device optical system 70 has reached the movement target position Tp1 by determining whether the displacement between the current position of the device optical system 70 and the movement target position Tp1 is within a predetermined threshold. The current position of the device optical system 70 can be determined based on the control content of the first moving mechanism 70D or the detection result of the position of the device optical system 70 obtained by the position detection sensor (not shown).

[0234] If it is determined in step S6 that the position of the device optical system 70 has reached the movement target position Tp1 (S6: Yes), the operation of the ophthalmic device 1 shifts to step S7. On the other hand, if it is determined in step S6 that the position of the device optical system 70 has not reached the movement target position Tp1 (S6: No), the operation of the ophthalmic device 1 shifts to step S5.

[0235] (S7: Conjugate relationship adjustment control)

[0236] When it is determined in step S6 that the position of the device optical system 70 has reached the moving target position Tp1 (S6: Yes), the main control unit 101 performs control to adjust the optical conjugate relationship of the moving optical system 80 in the device optical system 70. This control is a control to adjust the deviation of the optical conjugate relationship of the moving optical system 80 caused by the displacement of the moving target position Tp1 relative to the moving target position Tp.

[0237] The details of step S7 will be described later.

[0238] (S8: Diopter adjustment control)

[0239] Next, the main control unit 101 performs diopter adjustment control. This control is a control for moving the position of the slit 22 in the optical axis direction according to the diopter of the eye E to be inspected.

[0240] The details of step S8 will be described later.

[0241] (S9: Determine the moving target position as the predetermined working distance)

[0242] When it is determined in step S3 that the part of the device is not in contact with the face of the subject (S3: No), the main control unit 101 controls the moving target position determination unit 230 to determine the moving target position Tp as the predetermined working distance. The position of the moving target position Tp in the Z direction is the position where the fundus Ef can be photographed at the maximum viewing angle under the optimal optical conditions predetermined in the ophthalmologic device 1.

[0243] The movement target position determination unit 230 obtains the movement target position Tp as described above.

[0244] (S10: XYZ drive)

[0245] Next, the main control unit 101 controls the first moving mechanism 70D to move the device optical system 70 in the X, Y and Z directions similarly to step S5 , so that the position of the device optical system 70 relative to the eye E becomes the movement target position Tp determined in step S9 .

[0246] (S11: Arrived at the moving target position?)

[0247] The main control unit 101 determines whether the position of the device optical system 70 has reached the movement target position Tp in the same manner as step S6. In some embodiments, step S11 is executed at a predetermined time interval based on the execution start timing of the process of step S10.

[0248] For example, the main control unit 101 determines whether the position of the device optical system 70 has reached the movement target position Tp by determining whether the displacement between the current position of the device optical system 70 and the movement target position Tp is within a predetermined threshold.

[0249] When it is determined in step S11 that the position of the device optical system 70 has reached the movement target position Tp (S11: Yes), the operation of the ophthalmic device 1 shifts to step S12. On the other hand, when it is determined in step S11 that the position of the device optical system 70 has not reached the movement target position Tp (S11: No), the operation of the ophthalmic device 1 shifts to step S10.

[0250] (S12: Diopter adjustment control)

[0251] When it is determined in step S11 that the position of the device optical system 70 has reached the movement target position Tp (S11: YES), the main control unit 101 performs diopter adjustment control. Step S12 is the same as step S8.

[0252] (S13: Shooting)

[0253] After step S8 or step S12 , the main control unit 101 controls the illumination optical system 20 , the light scanner 30 , and the photographing optical system 40 to photograph the fundus Ef by the slit scanning method.

[0254] The details of step S13 will be described later.

[0255] With the above, the operation of the ophthalmologic apparatus 1 is completed (END).

[0256] For example, according to Fig.10 The process shown is to execute Fig. 9 Step S7.

[0257] (S21: Move the optical system so that the iris and the aperture mirror are in a conjugate relationship)

[0258] In step S7, first, the main control unit 101 controls the optical relationship adjustment amount determination unit 240 to determine an adjustment amount for adjusting the deviation of the optical conjugate relationship of the moving optical system 80 caused by the displacement of the moving target position Tp1 relative to the moving target position Tp. The optical relationship adjustment amount determination unit 240 calculates the adjustment amount z shown in equation (1): ir . Adjustment amount z ir The adjustment amount is used to adjust the deviation of the position of the aperture mirror 45 which should be arranged at a position roughly optically conjugate with the iris of the eye E to be inspected in order to move the aperture mirror 45 to the moving target position Tp1 through the device optical system 70, and to arrange the position of the aperture mirror 45 at a position roughly optically conjugate with the iris of the eye E to be inspected.

[0259] The main control unit 101 controls the second moving mechanism 80D to move the moving optical system 80 relative to the objective lens 46 by an adjustment amount z in the Z direction (the optical axis direction of the objective lens 46) approaching the objective lens 46. ir .

[0260] That is, when it is determined that a predetermined part of the subject's face is in contact with a part of the device, the main control unit 101 can control the illumination optical system 20 so that the iris aperture 21 and the light scanner 30 are arranged at a position that is roughly optically conjugate with the iris of the subject's eye E and the slit 22 is arranged at a position that is roughly optically conjugate with the fundus Ef (the shooting part) of the subject's eye E.

[0261] (S22: Move the focus lens so that the fundus and the image sensor are in a conjugate relationship)

[0262] Next, the main control unit 101 controls the optical relationship adjustment amount determination unit 240 to determine an adjustment amount for adjusting the deviation of the focus position of the focus lens 47 caused by the displacement of the movement target position Tp1 relative to the movement target position Tp. The optical relationship adjustment amount determination unit 240 obtains the adjustment amount z shown in equation (2): fr . Adjustment amount z fr This is an adjustment amount for adjusting the deviation of the focal position changed by the focus lens 47 by moving the device optical system 70 to the movement target position Tp1.

[0263] The main control unit 101 controls the moving mechanism 47D to move the focus lens 47 relative to the objective lens 46 by an adjustment amount z in the Z direction (the optical axis direction of the objective lens 46) approaching the objective lens 46. fr Before the focus lens 47 performs focus control, the reference position of the focus lens 47 for focus control is offset by the adjustment amount z fr After the focus lens 47 performs focus control, the focus position after the focus lens 47 moves is shifted by the adjustment amount z fr .

[0264] That is, when it is determined that a predetermined part of the subject's face is in contact with a part of the apparatus, the main control unit 101 can control the photographing optical system 40 so that the image sensor 51 is arranged at a position optically substantially conjugate with the fundus Ef (photographing part).

[0265] Above, the end Fig. 9 Step S7.

[0266] For example, according to Fig.11 The process shown is to execute Fig. 9 Step S8 or step S12.

[0267] (S31: Obtaining diopter)

[0268] In step S8 or step S12 , first, the main control section 101 acquires the refractive power of the eye to be inspected E from an external ophthalmologic measurement device or an electronic medical chart.

[0269] For example, the main control unit 101 acquires the refractive power of the eye to be inspected E from an external ophthalmologic measurement device or an electronic medical chart via a communication unit (not shown).

[0270] (S32: Changing the position of the slit)

[0271] Next, the main control section 101 changes the position of the slit 22 on the optical axis of the illumination optical system 20 according to the refractive power of the eye E acquired in step S31 .

[0272] Specifically, the main control unit 101 refers to the first control information stored in the storage unit 102 to determine the position of the slit 22 corresponding to the diopter, and controls the moving mechanism 22D so that the slit 22 is arranged at the determined position.

[0273] above, Fig. 9 Step S8 or step S12 ends (END).

[0274] For example, according to Fig.12 The process shown is to execute Fig. 9 Step S13.

[0275] (S41: Illuminating light)

[0276] In step S13, first, the main control unit 101 generates slit-shaped illumination light through the illumination optical system 20, and starts deflection control of the light scanner 30, thereby starting to irradiate the desired irradiation range of the fundus Ef with illumination light. When irradiation of illumination light starts, as described above, the slit-shaped illumination light is sequentially irradiated within the desired irradiation range.

[0277] (S42: Acquiring photosensitivity results)

[0278] As described above, the main control unit 101 acquires the light-reception results of the pixels within the aperture range of the image sensor 51 corresponding to the irradiation range of the illumination light of the fundus Ef executed in step S41 .

[0279] (S43: Next irradiation position?)

[0280] The main control unit 101 determines whether there is a next irradiation position to be irradiated with illumination light. The main control unit 101 can determine whether there is a next irradiation position to be irradiated with illumination light by determining whether the irradiation range of the sequentially moving illumination light covers a predetermined imaging range of the fundus Ef.

[0281] If it is determined that there is a next irradiation position to be irradiated with illumination light (S43: Yes), the process of step S13 moves to step S44. If it is determined that there is no next irradiation position to be irradiated with illumination light (S43: No), the process of step S13 moves to step S45.

[0282] (S44: Changing the deflection angle of illumination light)

[0283] When it is determined in step S43 that there is a next irradiation position to be irradiated with illumination light (S43: Yes), the main control unit 101 controls the optical scanner 30 to change the deflection angle of the illumination light to a predetermined deflection angle within a predetermined deflection angle range. Thus, the irradiation range of the illumination light of the fundus Ef is changed. After step S44, step S41 is executed.

[0284] (S45: Image Formation)

[0285] In step S43, when it is determined that there is no next irradiation position to be irradiated with illumination light (S43: No), the main control unit 101 changes the irradiation range of the illumination light in step S44 and forms an image of the eye E to be inspected in the data processing unit 200 based on the repeatedly acquired photosensitivity results.

[0286] For example, the data processing unit 200 synthesizes a plurality of light-receiving results with different illumination ranges (opening ranges on the light-receiving surface SR of the image sensor 51) for the number of repetitions of the processes of steps S41 to S44 according to the shifting order of the illumination range, thereby forming a fundus image of one frame of the fundus Ef.

[0287] In some embodiments, in step S41, illumination light is irradiated within the irradiation range set so that overlapping regions are provided between adjacent irradiation ranges. Thus, in step S45, images are synthesized so that the overlapping regions overlap each other to form a fundus image of one frame.

[0288] The above process of step S13 ends (END).

[0289] As described above, according to the first embodiment, it is determined whether the predetermined part of the subject's face is in contact with the part of the device due to the movement of the device optical system 70. When it is determined that the predetermined part of the subject's face is not in contact with the part of the device, the ophthalmic device 1 moves the device optical system 70 to a predetermined working distance at which the fundus Ef can be photographed at the maximum viewing angle under the predetermined optimal optical conditions. Thus, the fundus Ef can be photographed at the maximum viewing angle under the predetermined optimal optical conditions.

[0290] On the other hand, when it is determined that a predetermined part of the subject's face is in contact with a part of the device, the ophthalmic device 1 moves the device optical system 70 so that it is away from the subject's eye E by a predetermined adjustment distance relative to the above-mentioned predetermined working distance. In addition, by moving the mobile optical system 80 in the device optical system 70, the deviation of the optical conjugate relationship caused by the movement of the device optical system 70 is adjusted, and by moving the focus lens 47 in the mobile optical system 80, the focus position caused by the movement of the device optical system 70 is adjusted. Thus, while avoiding the increase in the diameter of the objective lens, the subject's eye can be photographed at a position where the distance between the subject's eye and the optical system becomes the shortest distance at which the device and the subject's face do not come into contact. At this time, the device and the subject's face do not come into contact, and the subject's eye can be photographed at the largest possible viewing angle.

[0291] <Second Embodiment>

[0292] In the first embodiment, the moving optical system 80 includes the illumination optical system 20 , the light scanner 30 , the projection optical system 35 , the imaging optical system 40 , and the imaging device 50 in the device optical system 70 , but the configuration of the embodiment is not limited thereto.

[0293] Hereinafter, the ophthalmologic apparatus according to the second embodiment will be described mainly focusing on the differences from the ophthalmologic apparatus 1 according to the first embodiment.

[0294] Fig.13 An example of the configuration of an optical system of an ophthalmologic apparatus according to the second embodiment is shown. Fig.13 In, with Figure 1 The same parts are denoted by the same reference numerals, and the description thereof will be appropriately omitted.

[0295] The configuration of the optical system of the ophthalmologic apparatus 1 a according to the second embodiment is different from the configuration of the optical system of the ophthalmologic apparatus 1 according to the first embodiment in that a moving optical system 80 a is provided instead of the moving optical system 80 .

[0296] The moving optical system 80a includes the illumination optical system 20, the projection optical system 35, the light scanner 30, and the aperture mirror 45. The moving optical system 80a is moved along the optical axis direction of the objective lens 46 by the second moving mechanism 80D. That is, the moving optical system 80a is configured to be relatively movable with respect to the cameras 60A, 60B, the objective lens 46, the focus lens 47, the relay lens 48, the imaging lens 49, and the imaging device 50.

[0297] The control of the ophthalmologic apparatus 1 a according to the second embodiment differs from the control of the ophthalmologic apparatus 1 according to the first embodiment in the adjustment amount determined by the optical relationship adjustment amount determination unit 240 .

[0298] The optical relationship adjustment amount determination unit 240 according to the second embodiment uses β i 、f i The adjustment distance dz is a variable, and the function F shown in formula (3) is used to calculate the adjustment amount z for adjusting the optical conjugate relationship of the optical system. ig . Adjustment amount z ig is equal to the adjustment amount zir shown in equation (1).

[0299] [Formula 3]

[0300] z ig =z ir =F(β i , f i ,dz) (3)

[0301] On the other hand, the optical relationship adjustment amount determination unit 240 according to the second embodiment uses β o , β f , β r 、f o 、f f , the adjustment distance dz is a variable, and the adjustment amount z for adjusting the movement amount of the focus lens 47 (the movement amount of the focal position) is obtained. fg .

[0302] [Formula 4]

[0303] z fg =G(β o , β f , β R , f o , f f ,dz) (4)

[0304] When it is determined that a part of the device is in contact with a predetermined part of the subject's face, the main control unit 101 controls the second moving mechanism 80D described later to move the moving optical system 80a relative to the objective lens 46 along the optical axis direction of the objective lens 46. At this time, the second moving mechanism 80D moves the moving optical system 80a in a direction approaching the objective lens 46 by the adjustment amount z shown in formula (3). ig .

[0305] Similarly, when it is determined that a part of the device is in contact with a predetermined part of the subject's face, the main control unit 101 controls the moving mechanism 47D described later to move the focus lens 47 relative to the objective lens 46 along the optical axis direction. At this time, the moving mechanism 47D moves the focus lens 47 in a direction approaching the objective lens 46 by the adjustment amount z shown in formula (4). fg .

[0306] The adjustment amount z shown in formula (4) fg The adjustment amount z shown in formula (2) fr However, the mobile optical system 80a can be configured more compactly than the mobile optical system 80.

[0307] The operation of the ophthalmologic apparatus 1 a according to the second embodiment is substantially the same as the operation of the ophthalmologic apparatus 1 according to the first embodiment, except for the adjustment amount determined by the optical relationship adjustment amount determination unit 240 .

[0308] As described above, according to the second embodiment, while achieving a compact structure of the moving optical system for adjusting the optical conjugate relationship, the same effects as those of the first embodiment can be obtained.

[0309] <Third Embodiment>

[0310] In the first embodiment or the second embodiment, the case where the moving optical system 80 or the moving optical system 80a is moved within the device optical system 70 is described, but the configuration according to the embodiment is not limited thereto.

[0311] Hereinafter, the ophthalmologic apparatus according to the third embodiment will be described mainly focusing on the differences from the ophthalmologic apparatus 1 according to the first embodiment.

[0312] Fig.14 An example of the configuration of an optical system of an ophthalmologic apparatus according to a third embodiment is shown. Fig.14 In, with Figure 1 The same parts are denoted by the same reference numerals, and the description thereof will be appropriately omitted.

[0313] The configuration of the optical system of the ophthalmologic apparatus 1 b according to the third embodiment differs from that of the ophthalmologic apparatus 1 according to the first embodiment in that the objective lens 46 is movable in the optical axis direction (Z direction) instead of the moving optical system 80 .

[0314] Fig.15 A block diagram showing a configuration example of a control system of an ophthalmologic apparatus 1b according to the third embodiment. Fig.15 In, with Figure 7 The same parts are denoted by the same reference numerals, and the description thereof will be appropriately omitted.

[0315] The configuration of the control system of the ophthalmologic apparatus 1 b according to the third embodiment differs from that of the ophthalmologic apparatus 1 according to the first embodiment in that a third moving mechanism 46D is provided instead of the second moving mechanism 80D and a control unit 100 b is provided instead of the control unit 100 .

[0316] The third moving mechanism 46D moves the objective lens 46 along the optical axis direction (Z direction) of the objective lens 46. Thus, the objective lens 46 moves relative to the aperture mirror 45, the focus lens 47, the relay lens 48, the imaging lens 49, the imaging device 50, the projection optical system 35, the optical scanner 30, and the illumination optical system 20.

[0317] For example, the third moving mechanism 46D includes a third holding member for holding the objective lens 46 and a third driving unit (motor) for driving the third holding member, and the third driving unit is configured to drive the third holding member according to a control signal from the control unit 100b (main control unit 101b). The third holding member is configured to be movable on the first holding member.

[0318] The function of the control unit 100 b is different from that of the control unit 100 in that the control unit 100 b can control the third moving mechanism 46D instead of controlling the second moving mechanism 80D.

[0319] The control unit 100b includes a main control unit 101b and a storage unit 102b. The function of the main control unit 101b is different from that of the main control unit 101 in that the control of the third moving mechanism 46D is performed instead of the control of the second moving mechanism 80D, thereby being able to perform control for obtaining substantially the same effect as the first embodiment or the second embodiment. The function of the storage unit 102b is different from that of the storage unit 102 in that the program executed by the main control unit 101b is stored instead of the program executed by the main control unit 101.

[0320] The third moving mechanism 46D is an example of the “second moving mechanism” according to the embodiment.

[0321] Fig.16 The flowchart shows an operation example of the ophthalmologic apparatus 1b according to the third embodiment. The storage unit 102b stores data for implementing Fig.16 , Fig.11 , Fig.12 The main control unit 101b operates according to the computer program, thereby executing Fig.16 , Fig.11 , Fig.12 Processing shown.

[0322] exist Fig.16 In, also with Fig. 9 Likewise, a fixation target is projected onto the fundus of the eye E to be inspected in such a manner that the eye is guided to a desired fixation position using a fixation projection system (not shown).

[0323] (S51: Photographing the face of the subject)

[0324] First, the main control unit 101b controls the cameras 60A and 60B to capture images of the subject's face substantially simultaneously, similarly to step S1.

[0325] (S52: Generate three-dimensional shape data of the subject's face)

[0326] Next, the main control unit 101 b controls the three-dimensional shape data generating unit 210 in the same manner as in step S2 to generate three-dimensional data of the face of the subject from the two images acquired in step S51 .

[0327] (S53: Contact with device?)

[0328] Next, the main control unit 101b controls the contact determination unit 220 in the same manner as step S3, and uses the three-dimensional shape data generated in step S52 and the external shape data of the device to determine whether a part of the device is in contact with the face of the subject when the eye E is placed in the device's inherent measurement position.

[0329] If it is determined in step S53 that the device part is in contact with the subject's face (S53: Yes), the operation of the ophthalmic device 1b moves to step S54. If it is determined in step S53 that the device part is not in contact with the subject's face (S53: No), the operation of the ophthalmic device 1b moves to step S60.

[0330] (S54: Determine the moving target position of the Z target position offset)

[0331] When it is determined in step S53 that a part of the device is in contact with the face of the subject (S53: Yes), the main control unit 101b controls the moving target position determination unit 230 in the same manner as step S4, and determines the moving target position Tp1 as the moving target position offset from the moving target position in the Z direction (Z target position).

[0332] (S55: moving objective lens)

[0333] Next, the main control unit 101b controls the third moving mechanism 46D to move the objective lens 46 in a direction away from the subject's eye E in the optical axis direction of the objective lens 46. The main control unit 101b can move the objective lens 46 by an amount corresponding to the adjustment distance dz. In some embodiments, the main control unit 101b controls the third moving mechanism 46D to move the objective lens 46 by the adjustment distance dz.

[0334] (S56: XYZ drive)

[0335] Next, the main control unit 101b controls the first moving mechanism 70D similarly to step S5 to move the device optical system 70 in the X, Y and Z directions so that the position of the device optical system 70 relative to the eye E becomes the movement target position Tp1 determined in step S54.

[0336] Thus, the apparatus optical system 70 can be brought close to the eye E while maintaining the distance z0 between the iris of the eye E and the aperture mirror 45 (that is, the optically conjugate relationship between the iris and the illumination optical system 20 ).

[0337] (S57: Arrived at the moving target position?)

[0338] The main control unit 101b determines whether the position of the device optical system 70 has reached the movement target position Tp1 in the same manner as step S6. In some embodiments, step S57 is executed at a predetermined time interval based on the execution start timing of the process of step S56.

[0339] If it is determined in step S57 that the position of the device optical system 70 has reached the movement target position Tp1 (S57: Yes), the operation of the ophthalmologic apparatus 1b proceeds to step S58. On the other hand, if it is determined in step S57 that the position of the device optical system 70 has not reached the movement target position Tp1 (S57: No), the operation of the ophthalmologic apparatus 1b proceeds to step S56.

[0340] In this embodiment, as shown in steps S55 to S57, before the device optical system 70 is aligned with the subject's eye E, the objective lens 46 is moved in a direction away from the subject's eye E. This can reduce the possibility that a part of the device will come into contact with the subject's face while the device optical system 70 is aligned with the subject's eye E.

[0341] (S58: Conjugate relationship adjustment control)

[0342] When it is determined in step S57 that the position of the device optical system 70 has reached the moving target position Tp1 (S57: Yes), the main control unit 101b performs control to adjust the optical conjugate relationship in the moving optical system 80 in the device optical system 70. This control is the same as step S7, and is a control to adjust the deviation of the optical conjugate relationship of the moving optical system 80 caused by the displacement of the moving target position Tp1 from the moving target position Tp.

[0343] However, in step S58, the Fig.10 This is different from step S7 in that the same processing as step S22 is performed.

[0344] Specifically, in step S58, the focus lens 47 is moved so that the fundus Ef and the image sensor 51 are in a conjugate relationship. That is, the main control unit 101b controls the moving mechanism 47D to move the focus lens 47 along the optical axis direction by an adjustment amount corresponding to the adjustment distance dz. In the case before the focus control is performed by the focus lens 47, the reference position of the focus control performed by the focus lens 47 is offset by the above adjustment amount. In the case after the focus control is performed by the focus lens 47, the focus position after the focus lens 47 is moved is offset by the above adjustment amount.

[0345] (S59: Diopter adjustment control)

[0346] Next, the main control unit 101b performs diopter adjustment control in the same manner as step S8.

[0347] (S60: Determine the moving target position as the predetermined working distance)

[0348] When it is determined in step S53 that the device part is not in contact with the subject's face (S53: No), the main control unit 101b controls the movement target position determination unit 230 in the same manner as in step S9 to determine the movement target position Tp as the predetermined working distance.

[0349] (S61: XYZ drive)

[0350] Next, the main control unit 101b controls the first moving mechanism 70D similarly to step S56 to move the device optical system 70 in the X, Y and Z directions so that the position of the device optical system 70 relative to the eye E becomes the movement target position Tp determined in step S60.

[0351] (S62: Arrived at the moving target position?)

[0352] The main control unit 101b determines whether the position of the device optical system 70 has reached the movement target position Tp in the same manner as step S57. In some embodiments, step S62 is executed at a predetermined time interval based on the execution start timing of the process of step S61.

[0353] If it is determined in step S62 that the position of the device optical system 70 has reached the movement target position Tp (S62: Yes), the operation of the ophthalmologic apparatus 1b is transferred to step S63. On the other hand, if it is determined in step S62 that the position of the device optical system 70 has not reached the movement target position Tp (S62: No), the operation of the ophthalmologic apparatus 1b is transferred to step S61.

[0354] (S63: Diopter adjustment control)

[0355] When it is determined in step S62 that the position of the device optical system 70 has reached the movement target position Tp (S62: YES), the main control unit 101b performs diopter adjustment control in the same manner as in step S59.

[0356] (S64: Shooting)

[0357] After step S59 or step S63 , the main control unit 101 b controls the illumination optical system 20 , the light scanner 30 , and the imaging optical system 40 in the same manner as step S13 , and images the fundus oculi Ef by the slit scanning method.

[0358] With the above, the operation of the ophthalmologic apparatus 1 b ends (END).

[0359] As described above, according to the third embodiment, the objective lens 46 is moved instead of the moving optical system 80. Thus, while the structure of the moving optical system for adjusting the conjugate relationship is made compact, the same effects as those of the first embodiment can be obtained.

[0360] <Fourth Embodiment>

[0361] In the first to third embodiments, the three-dimensional shape of the face of the subject is detected using the cameras 60A and 60B, but the structure involved in the embodiments is not limited to this. In the fourth embodiment, a TOF (Time-of-Flight) camera is used to detect the three-dimensional shape of the face of the subject.

[0362] The ophthalmic apparatus according to some embodiments includes cameras 60A, 60B and a TOF camera. The cameras 60A, 60B are used to determine the three-dimensional position of the characteristic part of the eye E to be inspected for alignment, and the TOF camera is used to acquire the three-dimensional shape data of the face of the inspected person.

[0363] Some embodiments involve an ophthalmologic apparatus including only a TOF camera, using which the three-dimensional position of a characteristic portion of the subject's eye E used for alignment is determined, and three-dimensional shape data of the subject's face is acquired.

[0364] The ophthalmic device according to the fourth embodiment is described below, focusing on the differences from the ophthalmic device 1 according to the first embodiment. In addition, the ophthalmic device according to the fourth embodiment is described in which only the TOF camera is included. In addition, the structure according to the fourth embodiment can also be applied to the ophthalmic device 1a according to the second embodiment or the ophthalmic device 1b according to the third embodiment.

[0365] Fig.17 An example of the configuration of an optical system of an ophthalmologic apparatus according to a fourth embodiment is shown. Fig.17 In, with Figure 1 The same parts are denoted by the same reference numerals, and the description thereof will be appropriately omitted.

[0366] The configuration of the optical system of the ophthalmologic apparatus 1 c according to the fourth embodiment is different from the configuration of the optical system of the ophthalmologic apparatus 1 according to the first embodiment in that a TOF camera 61 is provided instead of the cameras 60A and 60B.

[0367] The TOF camera 61 includes, for example, a light source and a two-dimensional area sensor, and is configured to be able to measure the emission timing of the sine wave light or pulse light from the light source and the reception timing of the return light of the sine wave light or pulse light from the subject or the eye E in the two-dimensional area sensor. Thus, the Z-direction components at multiple positions on the irradiation surface of the subject or the eye E can be determined based on the round-trip time required for the sine wave light or pulse light.

[0368] Fig.18 A block diagram showing a configuration example of a control system of an ophthalmologic apparatus 1c according to a fourth embodiment. Fig.18 In, with Figure 7 The same parts are denoted by the same reference numerals, and the description thereof will be appropriately omitted.

[0369] The configuration of the control system of the ophthalmologic apparatus 1 c according to the fourth embodiment differs from the configuration of the control system of the ophthalmologic apparatus 1 according to the first embodiment in that a TOF camera 61 is provided instead of the cameras 60A and 60B and a control unit 100 c is provided instead of the control unit 100 .

[0370] The function of the control unit 100 c is different from that of the control unit 100 in that the control unit 100 c can control the TOF camera 61 instead of controlling the cameras 60A and 60B.

[0371] The control unit 100c includes a main control unit 101c and a storage unit 102c. The function of the main control unit 101c differs from that of the main control unit 101 in that the control of the TOF camera 61 is executed instead of the control of the cameras 60A and 60B, thereby being able to execute control for obtaining substantially the same effects as those of the first to third embodiments. The function of the storage unit 102c differs from that of the storage unit 102 in that the program executed by the main control unit 101c is stored instead of the program executed by the main control unit 101c.

[0372] In the fourth embodiment, the three-dimensional shape data generating section 210 generates three-dimensional shape data based on the three-dimensional positions of a plurality of characteristic parts in the face or the eye E of the subject determined by the TOF camera 61 .

[0373] In addition, the moving target position determination unit 230 determines the moving target position Tp as a position where the optical axis of the objective lens 46 is roughly consistent with the axis of the eye E and the distance between the objective lens 46 and the eye E is a predetermined working distance WD0 based on the three-dimensional position of the characteristic part in the eye E determined by the TOF camera 61.

[0374] The operation of the ophthalmologic apparatus 1 c according to the fourth embodiment is substantially the same as the operation of the ophthalmologic apparatus 1 according to the first embodiment except for the above-mentioned points.

[0375] The TOF camera 61 and the three-dimensional shape data generating unit 210 are examples of the “shape data acquiring unit” according to the embodiment.

[0376] As described above, according to the fourth embodiment, while achieving a compact structure of the optical system by using a TOF camera, the same effects as those of the first embodiment can be obtained.

[0377] <Fifth Embodiment>

[0378] In the first to fourth embodiments, the three-dimensional shape of the face of the subject is detected using the camera 60A, 60B or the TOF camera 61, but the structure involved in the embodiment is not limited to this. In the fifth embodiment, the three-dimensional shape of the face of the subject is determined using the shape-from-shading method.

[0379] The shape-from-shading method is a technique that uses an off-axis illumination light source with a known incident angle on the object to be measured to illuminate the object to be measured, and determines the three-dimensional shape of the surface of the object to be measured from the obtained shadow image.

[0380] The ophthalmic device involved in some embodiments includes a camera 60A, 60B or a TOF camera and an off-axis illumination light source, and uses the camera 60A, 60B or the TOF camera to determine the three-dimensional position of the characteristic parts of the subject's eye E used for alignment, and obtains the three-dimensional shape data of the subject's face from the shadow image obtained using the off-axis illumination light source.

[0381] Some embodiments involve an ophthalmologic apparatus that includes only an off-axis illumination light source, determines the three-dimensional position of a characteristic part of the subject's eye E for alignment based on a shadow image acquired using the off-axis illumination light source, and acquires three-dimensional shape data of the subject's face.

[0382] The ophthalmic device according to the fifth embodiment is described below with the differences from the ophthalmic device 1 according to the first embodiment as the center. In addition, the following case is described: the ophthalmic device according to the fifth embodiment includes cameras 60A, 60B and an off-axis illumination light source, the three-dimensional position of the characteristic part of the subject's eye E used for alignment is determined using the cameras 60A, 60B, and the three-dimensional shape data of the subject's face is obtained from the shadow image obtained using the off-axis illumination light source. In addition, the structure according to the fifth embodiment can also be applied to the ophthalmic device 1a according to the second embodiment or the ophthalmic device 1b according to the third embodiment.

[0383] Fig.19 An example of the structure of the optical system of the ophthalmologic apparatus according to the fifth embodiment is shown. Fig.19 In, with Figure 1The same parts are denoted by the same reference numerals, and the description thereof will be appropriately omitted.

[0384] The configuration of the optical system of the ophthalmologic apparatus 1 d according to the fifth embodiment differs from the configuration of the optical system of the ophthalmologic apparatus 1 according to the first embodiment in that an off-axis illumination light source 65 is added.

[0385] The off-axis illumination light source 65 irradiates illumination light with a known incident angle relative to the anterior portion of the subject's eye E (for example, a characteristic portion of the three-dimensional position of the subject's eye E such as a pupil area, at which the object's eye E is calculated) at a predetermined reference position on the optical axis of the objective lens 46. In some embodiments, the incident angle of the illumination light from the off-axis illumination light source 65 relative to the anterior portion of the subject's eye E is known for each of a plurality of reference positions on the optical axis of the objective lens 46. In some embodiments, the off-axis illumination light source 65 has a plurality of light sources with a known incident angle of the illumination light relative to the anterior portion of the subject's eye E at each of a plurality of reference positions on the optical axis of the objective lens 46.

[0386] Fig. 20 A block diagram showing a configuration example of a control system of an ophthalmologic apparatus 1d according to the fifth embodiment. Fig. 20 In, with Figure 7 The same parts are denoted by the same reference numerals, and the description thereof will be appropriately omitted.

[0387] The configuration of the control system of the ophthalmologic apparatus 1 d according to the fifth embodiment differs from the configuration of the control system of the ophthalmologic apparatus 1 according to the first embodiment in that an off-axis illumination light source 65 is added and a control unit 100 d is provided instead of the control unit 100 .

[0388] The functions of the control unit 100 d differ from those of the control unit 100 in that the control unit 100 d can control the off-axis illumination light source 65 and can control the data processing unit 200 to determine the three-dimensional shape of the subject's face based on the shadow image acquired using the off-axis illumination light source 65 .

[0389] The control unit 100d includes a main control unit 101d and a storage unit 102d. The function of the main control unit 101d differs from that of the main control unit 101 in that, in order to determine the three-dimensional shape of the subject's face, control is performed on the off-axis illumination light source 65 instead of the cameras 60A and 60B, thereby enabling control to be performed for obtaining substantially the same effects as those of the first to third embodiments. The function of the storage unit 102d differs from that of the storage unit 102 in that the program executed by the main control unit 101d is stored instead of the program executed by the main control unit 101.

[0390] The main control unit 101b controls the off-axis illumination light source 65 to illuminate the face of the subject using the off-axis illumination light, and controls the image sensor 51 to receive the return light of the off-axis illumination light from the face of the subject. The main control unit 101b controls the three-dimensional shape data generation unit 210 (data processing unit 200) to generate three-dimensional shape data representing the three-dimensional shape of the face of the subject from the shadow image generated based on the return light of the off-axis illumination light by the shape from shading method.

[0391] For example, the three-dimensional shape data generating unit 210 generates three-dimensional shape data representing the three-dimensional shape of the face of the subject according to a known calculation method using a shadow image representing the distribution of the reflected brightness value and the incident angles of the off-axis illumination light at multiple positions in the image. In some embodiments, the three-dimensional shape data generating unit 210 approximates the surface of the face of the subject as a whole or in part with a quadratic surface, calculates the coordinate position of each position on the quadratic surface by a known calculation method, and generates the above three-dimensional shape data.

[0392] In the fifth embodiment, the three-dimensional shape data generating unit 210 generates three-dimensional shape data representing the three-dimensional shape of the face of the subject by the above-mentioned method from the shadow image of the face of the subject acquired using the off-axis illumination light source 65. In addition, similarly to the first embodiment, the moving target position determining unit 230 determines the moving target positions Tp and Tp1 based on two images of the anterior ocular segment acquired by substantially simultaneously capturing the images using the cameras 60A and 60B.

[0393] The operation of the ophthalmologic apparatus 1 d according to the fifth embodiment is substantially the same as the operation of the ophthalmologic apparatus 1 according to the first embodiment except for the above-mentioned points.

[0394] The off-axis illumination light source 65 , the image sensor 51 , and the three-dimensional shape data generating unit 210 are examples of the “shape data acquiring unit” according to the embodiment.

[0395] As described above, according to the fifth embodiment, by using the off-axis illumination light source 65 , it is possible to obtain the same effects as those of the first embodiment.

[0396] <Sixth Implementation Method>

[0397] In the first to fifth embodiments, it is described that whether a part of the device is in contact with the face of the subject is determined based on the three-dimensional shape data of the face of the subject, but the structure involved in the embodiments is not limited to this. In the sixth embodiment, a proximity sensor for detecting the proximity of the face of the subject relative to the part of the device is used to determine whether a part of the device is in contact with the face of the subject.

[0398] Hereinafter, the ophthalmologic apparatus according to the sixth embodiment will be described mainly with respect to the differences from the ophthalmologic apparatus 1 according to the first embodiment. The configuration according to the sixth embodiment can also be applied to the ophthalmologic apparatus 1a according to the second embodiment or the ophthalmologic apparatus 1b according to the third embodiment.

[0399] Fig.21 An example of the structure of the optical system of the ophthalmologic apparatus according to the sixth embodiment is shown. Fig.21 In, with Figure 1 The same parts are denoted by the same reference numerals, and the description thereof will be appropriately omitted.

[0400] The configuration of the optical system of the ophthalmologic apparatus 1 e according to the sixth embodiment is different from the configuration of the optical system of the ophthalmologic apparatus 1 according to the first embodiment in that a proximity sensor 68 is added.

[0401] The proximity sensor 68 is provided in the housing of the ophthalmologic apparatus 1e so as to face the face of the subject. Examples of the proximity sensor 68 include a mechanical proximity sensor and a non-mechanical proximity sensor.

[0402] The mechanical proximity sensor detects whether a part of the device is in contact with the subject's face based on the pressed state that changes when a mechanical switch such as a micro switch comes into contact with the subject's face.

[0403] Examples of non-mechanical proximity sensors include proximity sensors that detect whether a part of the device is in contact with the face of the subject based on environmental data that changes due to the proximity of the face of the subject. Examples of environmental data include electrostatic capacitance, electromagnetic waves, temperature, brightness, etc. In addition, non-mechanical proximity sensors include sensors that emit energy such as electromagnetic waves, light, and ultrasound to the face of the subject, and detect changes in material and energy reflected from the face of the subject to detect whether a part of the device is in contact with the face of the subject.

[0404] In some embodiments, the ophthalmic device 1 e is configured to include a plurality of proximity sensors to detect the proximity state of the subject's face relative to a part of the device at a plurality of different positions in the Z direction.

[0405] Fig. 22 A block diagram showing a configuration example of a control system of an ophthalmologic apparatus 1e according to the sixth embodiment. Fig. 22 In, with Figure 7 The same parts are denoted by the same reference numerals, and the description thereof will be appropriately omitted.

[0406] The structure of the control system of the ophthalmic device 1e involved in the sixth embodiment differs from the structure of the control system of the ophthalmic device 1 involved in the first embodiment in that a proximity sensor 68 is added, a data processing unit 200e is provided instead of the data processing unit 200, and a control unit 100e is provided instead of the control unit 100.

[0407] The function of the control unit 100 e is different from that of the control unit 100 in that the control unit 100 e can control the proximity sensor 68 .

[0408] The control unit 100e includes a main control unit 101e and a storage unit 102e. The function of the main control unit 101e is different from that of the main control unit 101 in that the proximity sensor 68 is controlled to detect the approach of the subject's face, thereby being able to perform control for obtaining substantially the same effects as those of the first to third embodiments. The function of the storage unit 102e is different from that of the storage unit 102 in that the program executed by the main control unit 101e is stored instead of the program executed by the main control unit 101.

[0409] Fig.23 Show Fig. 22 A block diagram of a configuration example of a data processing unit 200e is shown. Fig.23 In, with Figure 8 The same parts are denoted by the same reference numerals, and the description thereof will be appropriately omitted.

[0410] The data processing unit 200e and Figure 8 The data processing unit 200 shown is different in that the three-dimensional shape data generating unit 210 is deleted and a contact determining unit 220 e is provided instead of the contact determining unit 220 .

[0411] The contact determination unit 220 e determines whether a part of the device is in contact with the face of the subject based on the detection result obtained by the proximity sensor 68 .

[0412] The main control unit 101e controls the proximity sensor 68 to obtain the detection result, and controls the contact determination unit 220e to determine whether a part of the device is in contact with the face of the subject based on the obtained detection result.

[0413] The proximity sensor 68 is an example of the “detection unit” according to the embodiment.

[0414] Fig.24 The flowchart shows an operation example of the ophthalmologic apparatus 1e according to the sixth embodiment. The storage unit 102e stores data for implementing Fig.24 , Figure 10 to Figure 12 The main control unit 101e operates according to the computer program, thereby executing Fig.24 , Figure 10 to Figure 12 Processing shown.

[0415] exist Fig.24 In, also with Fig. 9 Likewise, a fixation target is projected onto the fundus of the eye E to be inspected in such a manner that the eye is guided to a desired fixation position using a fixation projection system (not shown).

[0416] (S71: Photographing the front eye)

[0417] First, the main control unit 101e controls the cameras 60A and 60B to substantially simultaneously capture images of the anterior ocular segment of the subject's eye E. Thus, two images of the anterior ocular segment having parallax are acquired.

[0418] (S72: Determine the target position of movement as the predetermined working distance)

[0419] Next, the main control unit 101 e controls the movement target position determination unit 230 in the same manner as in step S9 , and determines the movement target position Tp as the predetermined working distance by the above-described method using the two images acquired in step S71 .

[0420] (S73: XYZ drive)

[0421] Next, the main control unit 101e controls the first moving mechanism 70D similarly to step S10 to move the device optical system 70 in the X, Y and Z directions so that the position of the device optical system 70 relative to the eye E becomes the movement target position Tp determined in step S72.

[0422] (S74: Acquiring the detection result of the proximity sensor)

[0423] Next, the main control unit 101 e controls the proximity sensor 68 to obtain the detection result obtained by the proximity sensor 68 .

[0424] (S75: Contact with device?)

[0425] Next, the main control unit 101e uses the detection result of the proximity sensor 68 acquired in step S74 to control the contact determination unit 220 to determine whether a part of the device is in contact with the face of the subject.

[0426] If it is determined in step S75 that the device part is in contact with the subject's face (S75: Yes), the operation of the ophthalmic device 1e moves to step S76. If it is determined in step S75 that the device part is not in contact with the subject's face (S75: No), the operation of the ophthalmic device 1e moves to step S81.

[0427] (S76: Determine the moving target position of the Z target position offset)

[0428] When it is determined in step S75 that a part of the device is in contact with the subject's face (S75: Yes), the main control unit 101e controls the moving target position determination unit 230 in the same manner as step S4, and determines the moving target position Tp1 as the moving target position offset from the moving target position in the Z direction (Z target position).

[0429] (S77: XYZ drive)

[0430] Next, the main control unit 101e controls the first moving mechanism 70D to move the device optical system 70 in the X, Y and Z directions similarly to step S5, and the position of the device optical system 70 relative to the eye E becomes the movement target position Tp1 determined in step S76.

[0431] (S78: Arrived at the moving target position?)

[0432] The main control unit 101e determines whether the position of the device optical system 70 has reached the movement target position Tp1 in the same manner as step S6. In some embodiments, step S78 is executed at a predetermined time interval based on the execution start timing of the process of step S77.

[0433] If it is determined in step S78 that the position of the device optical system 70 has reached the movement target position Tp1 (S78: Yes), the operation of the ophthalmologic apparatus 1e proceeds to step S79. On the other hand, if it is determined in step S78 that the position of the device optical system 70 has not reached the movement target position Tp1 (S78: No), the operation of the ophthalmologic apparatus 1e proceeds to step S77.

[0434] (S79: Conjugate relationship adjustment control)

[0435] When it is determined in step S78 that the position of the device optical system 70 has reached the movement target position Tp1 ( S78 : YES), the main control unit 101 e performs control to adjust the optical conjugate relationship in the moving optical system 80 in the device optical system 70 in the same manner as in step S7 .

[0436] (S80: Diopter adjustment control)

[0437] Next, the main control unit 101e performs diopter adjustment control in the same manner as step S8.

[0438] (S81: Arrived at the moving target position?)

[0439] When it is determined in step S75 that the part of the device is not in contact with the face of the subject (S81: Yes), the main control unit 101e determines whether the position of the device optical system 70 has reached the moving target position Tp determined in step S72 in the same manner as step S11. In some embodiments, step S81 is executed at a predetermined time interval based on the execution start timing of the process of step S73.

[0440] If it is determined in step S81 that the position of the device optical system 70 has reached the movement target position Tp (S81: Yes), the operation of the ophthalmologic apparatus 1e moves to step S82. On the other hand, if it is determined in step S81 that the position of the device optical system 70 has not reached the movement target position Tp (S81: No), the operation of the ophthalmologic apparatus 1e moves to step S73.

[0441] (S82: Diopter adjustment control)

[0442] When it is determined in step S81 that the position of the device optical system 70 has reached the movement target position Tp ( S81 : Yes), the main control unit 101 e performs diopter adjustment control in the same manner as in step S80 .

[0443] (S83: Shooting)

[0444] After step S80 or step S82 , the main control unit 101 e controls the illumination optical system 20 , the light scanner 30 , and the imaging optical system 40 in the same manner as step S13 , and images the fundus Ef by the slit scanning method.

[0445] With the above, the operation of the ophthalmologic apparatus 1 e is completed (END).

[0446] In the sixth embodiment, a distance sensor for measuring the distance between a part of the device and a part of the subject's face may be provided instead of the proximity sensor 68. In this case, the contact determination unit determines whether the part of the device is in contact with the subject's face based on the distance obtained by the distance sensor.

[0447] As described above, according to the sixth embodiment, the approach of the subject's face is detected in real time instead of detecting the three-dimensional shape of the subject's face, so that the same effect as the first embodiment can be obtained while reducing the processing load for generating three-dimensional shape data.

[0448] [effect]

[0449] An ophthalmologic apparatus, an ophthalmologic apparatus control method, and a program according to an embodiment will be described.

[0450] A first mode of some embodiments is an ophthalmic device (1, 1a to 1e), comprising an optical system (device optical system 70), a first moving mechanism (70D), a second moving mechanism (80D, a third moving mechanism 46D), a contact determination unit (220, 220e) and a control unit (100, 100b to 100e, a main control unit 101, 101b to 101e). The optical system comprises: an objective lens (46); an illumination system (illumination optical system 20) for irradiating illumination light to the eye of a subject via the objective lens; and a photographing system (photographing optical system 40) for receiving return light of the illumination light via the objective lens. The first moving mechanism moves the optical system relative to the eye of the subject (the eye E to be examined). The second moving mechanism moves the objective lens, the illumination system and the photographing system relative to each other in the optical axis direction of the objective lens in the optical system. The contact determination unit determines whether a predetermined part of the face of the subject is in contact with a part of the device due to the movement performed by the first moving mechanism. The control unit controls the second moving mechanism so that the working distance between the objective lens and the eye of the subject changes in response to the determination result obtained by the contact determination unit.

[0451] According to this method, the subject's eye can be photographed at different working distances depending on the result of determining whether a part of the device is in contact with a predetermined part of the subject's face. Thus, while avoiding the increase in the diameter of the objective lens, the subject's eye can be photographed at the maximum viewing angle at which the device does not contact the subject's face.

[0452] A second mode of some embodiments is that in the first mode, when it is determined that the predetermined portion is not in contact with a part of the device, the control unit controls the first moving mechanism so that the working distance becomes a predetermined first working distance (WD0) and then causes the imaging system to receive return light from the eye of the subject irradiated with the illumination light. When it is determined that the predetermined portion is in contact with a part of the device, the control unit controls at least one of the first moving mechanism and the second moving mechanism so that the working distance becomes a second working distance (WD1) greater than the first working distance and controls the second moving mechanism to adjust the conjugate relationship in the optical system and then causes the imaging system to receive return light from the eye of the subject irradiated with the illumination light.

[0453] According to this embodiment, while preventing the diameter of the objective lens from becoming larger, the subject's eye can be photographed at a position where the distance between the subject's eye and the optical system becomes the shortest distance at which the device does not contact a predetermined part of the subject's face.

[0454] A third mode of some embodiments is that in the second mode, when it is determined that the above-mentioned predetermined part is in contact with a part of the device, the control unit controls the second moving mechanism so that the optical conjugate relationship between the lighting system and the shooting system maintains a predetermined conjugate relationship, and controls the shooting system so that a focal position corresponding to the refractive power of the subject's eye is configured in the shooting system.

[0455] According to this method, the deviation in the optical conjugate relationship between the lighting system and the shooting system caused by the change in the working distance is adjusted, and the focal position is changed in the shooting system according to the refractive power of the subject's eye. Therefore, even if the above-mentioned predetermined part is determined to be in contact with a part of the device, the image quality can be improved.

[0456] A fourth aspect of some embodiments is that in the second aspect or the third aspect, the imaging system includes a focus position changing member (focus lens 47) for changing the focus position of the return light. The control unit controls the focus position changing member according to the diopter of the eye of the subject.

[0457] According to this method, the imaging system can change the focal position according to the diopter of the subject's eye through a simple structure and simple control. As a result, even when the working distance is changed, a focused image can be obtained regardless of the diopter of the subject's eye.

[0458] A fifth mode of some embodiments is, in the fourth mode, comprising an aperture mirror (45) which can be arranged at a position substantially optically conjugate with the iris of the subject's eye and separates the optical path of the return light into the optical path of the illumination system and the optical path of the imaging system.

[0459] According to this aspect, an ophthalmologic apparatus can be provided which can capture an eye to be inspected at a maximum viewing angle without contacting the face of the subject while performing pupil division by an aperture mirror and avoiding an increase in the diameter of the objective lens.

[0460] A sixth aspect of some embodiments is that, in the fifth aspect, the lighting system includes: a light source (10); an iris diaphragm (21) irradiated with light from the light source; a slit (22) irradiated with light passing through the iris diaphragm; and a light scanner (30) that deflects the light passing through the slit. When it is determined that the predetermined portion is in contact with a part of the device, the control unit controls the lighting system so that the iris diaphragm and the light scanner are arranged at positions that are substantially optically conjugate with the iris, and the slit is arranged at a position that is substantially optically conjugate with the photographing portion of the subject's eye.

[0461] According to this aspect, even when it is determined that the predetermined portion is in contact with a part of the device, the quality of the image acquired by the slit scanning method can be improved by simply controlling the illumination system.

[0462] A seventh mode of some embodiments is that, in the fifth mode, the imaging system includes an imaging element (image sensor 51) for receiving the return light. When it is determined that the predetermined part is in contact with a part of the device, the control unit controls the imaging system so that the imaging element is arranged at a position that is substantially optically conjugate with the imaging part (fundus Ef) of the subject's eye.

[0463] According to this aspect, even when it is determined that the predetermined portion is in contact with a part of the device, the quality of the acquired image can be improved by simply controlling the imaging system.

[0464] An eighth aspect of some embodiments is that, in any one of the first to third aspects, the second moving mechanism moves the illumination system and the imaging system relative to the objective lens in the direction of the optical axis of the objective lens.

[0465] According to this aspect, by simply controlling the second moving mechanism that moves the illumination system and the imaging system relative to the objective lens, it is possible to adjust the deviation in the optical conjugate relationship between the illumination system and the imaging system caused by the change in the working distance.

[0466] A ninth aspect of some embodiments is that, in any one of the first to third aspects, the second moving mechanism moves the illumination system relative to the objective lens and the imaging system in a direction of an optical axis of the objective lens.

[0467] According to this aspect, by simply controlling the second moving mechanism that moves the illumination system relative to the objective lens and the imaging system, it is possible to adjust the deviation in the optical conjugate relationship between the illumination system and the imaging system caused by the change in the working distance.

[0468] A tenth aspect of some embodiments is that, in any one of the first to third aspects, the second moving mechanism (third moving mechanism 46D) moves the objective lens relative to the illumination system and the imaging system in the optical axis direction of the objective lens.

[0469] According to this aspect, by simply controlling the second moving mechanism that moves the objective lens relative to the illumination system and the imaging system, it is possible to adjust the deviation in the optical conjugate relationship between the illumination system and the imaging system caused by the change in the working distance.

[0470] An eleventh mode of some embodiments is that in any of the first to third modes, a shape data acquisition unit (cameras 60A, 60B and three-dimensional shape data generation unit 210, TOF camera 61 and three-dimensional shape data generation unit 210, off-axis illumination light source 65, image sensor 51 and three-dimensional shape data generation unit 210) is included to acquire three-dimensional shape data of the face of the subject. The contact determination unit determines whether a predetermined part of the face of the subject is in contact with a part of the device based on the three-dimensional shape data.

[0471] According to this aspect, it is possible to determine with high accuracy whether a part of the device is in contact with a predetermined part of the face of the subject.

[0472] A twelfth aspect of some embodiments is that in any of the first to third aspects, a detection unit (proximity sensor 68) is included to detect the proximity of the face of the subject to the local part of the device. The contact determination unit determines whether a predetermined part of the face of the subject is in contact with the local part of the device based on the detection result obtained by the detection unit.

[0473] According to this method, it is not necessary to generate three-dimensional shape data of the subject's face, and it is possible to determine with high accuracy whether a predetermined part of the subject's face is in contact with a part of the device through a simple structure and simple control.

[0474] A thirteenth mode of some embodiments is a control method of an ophthalmic device (1, 1a to 1e), wherein the ophthalmic device (1, 1a to 1e) includes an optical system (device optical system 70), a first moving mechanism (70D), a second moving mechanism (80D, a third moving mechanism 46D) and a contact determination unit (220, 220e). The control method of the ophthalmic device includes a contact determination step and a control step. The contact determination step determines whether a predetermined part of the face of the subject is in contact with a part of the device due to the movement performed by the first moving mechanism; and the control step controls the second moving mechanism so that the working distance between the objective lens and the subject's eye is different in response to the determination result obtained in the contact determination step.

[0475] According to this method, the subject's eye can be photographed at different working distances according to the result of determining whether a part of the device is in contact with a predetermined part of the subject's face. Thus, while avoiding the increase in the diameter of the objective lens, the subject's eye can be photographed at the maximum viewing angle at which the device does not contact the subject's face.

[0476] A fourteenth mode of some embodiments is that in the thirteenth mode, when it is determined that the predetermined portion is not in contact with a part of the device, the control step controls the first moving mechanism so that the working distance becomes a predetermined first working distance (WD0), and then causes the imaging system to receive the return light from the eye of the subject irradiated with the illumination light. When it is determined that the predetermined portion is in contact with a part of the device, the control step controls at least one of the first moving mechanism and the second moving mechanism so that the working distance becomes a second working distance (WD1) greater than the first working distance and controls the second moving mechanism to adjust the conjugate relationship in the optical system, and then causes the imaging system to receive the return light from the eye of the subject irradiated with the illumination light.

[0477] According to this embodiment, while preventing the diameter of the objective lens from becoming larger, the subject's eye can be photographed at a position where the distance between the subject's eye and the optical system becomes the shortest distance at which the device does not contact a predetermined part of the subject's face.

[0478] A fifteenth mode of some embodiments is that in the fourteenth mode, when it is determined that the above-mentioned predetermined part is in contact with a part of the device, the control step controls the second moving mechanism so that the optical conjugate relationship between the lighting system and the shooting system maintains a predetermined conjugate relationship, and controls the shooting system so that a focal position corresponding to the refractive power of the subject's eye is configured in the shooting system.

[0479] According to this method, the deviation in the optical conjugate relationship between the lighting system and the shooting system caused by the change in the working distance is adjusted, and the focal position is changed in the shooting system according to the refractive power of the subject's eye. Therefore, even if the above-mentioned predetermined part is determined to be in contact with a part of the device, the image quality can be improved.

[0480] A sixteenth aspect of some embodiments is that in the fourteenth aspect or the fifteenth aspect, the imaging system includes a focus position changing member (focus lens 47) for changing the focus position of the return light. In the control step, the focus position changing member is controlled according to the diopter of the eye of the subject.

[0481] According to this aspect, the focus position can be changed in the imaging system according to the diopter of the subject's eye by simple control. As a result, even when the working distance is changed, a focused image can be acquired regardless of the diopter of the subject's eye.

[0482] A seventeenth mode of some embodiments is that in the sixteenth mode, the ophthalmic device includes an aperture mirror (45) that can be arranged at a position that is substantially optically conjugate with the iris of the subject's eye, and separates the optical path of the return light into an optical path of the illumination system and an optical path of the photographing system. The illumination system includes: a light source (10); an iris aperture (21) that is irradiated with light from the light source; a slit (22) that is irradiated with light that passes through the iris aperture; and an optical scanner (30) that deflects the light that passes through the slit. When it is determined that the above-mentioned predetermined part is in contact with a part of the device, the control step controls the illumination system so that the iris aperture and the optical scanner are arranged at a position that is substantially optically conjugate with the iris and the slit is arranged at a position that is substantially optically conjugate with the photographing part of the subject's eye.

[0483] According to this method, while performing pupil division through the aperture mirror, the diameter of the objective lens is avoided from becoming larger, and the subject's eye is photographed at the maximum viewing angle without the device contacting the subject's face. By simple control of the lighting system, the image quality of the image acquired by the slit scanning method can be improved.

[0484] An eighteenth mode of some embodiments is that in the sixteenth mode, the ophthalmic device includes an aperture mirror (45) that can be arranged at a position that is substantially optically conjugate with the iris of the subject's eye, and separates the optical path of the return light into the optical path of the illumination system and the optical path of the shooting system. The shooting system includes a shooting element (image sensor 51) that receives the return light. When it is determined that the above-mentioned predetermined part is in contact with a part of the device, the shooting system is controlled in the control step so that the shooting element is arranged at a position that is substantially optically conjugate with the shooting part (fundus Ef) of the subject's eye.

[0485] According to this method, while performing pupil division through the aperture mirror, the diameter of the objective lens is avoided from becoming larger, and the subject's eye is photographed at the maximum viewing angle without the device contacting the subject's face. The quality of the acquired image can be improved by simple control of the shooting system.

[0486] A nineteenth aspect of some embodiments is that in any one of the thirteenth to fifteenth aspects, the second moving mechanism moves the illumination system and the imaging system relative to the objective lens along the optical axis direction of the objective lens.

[0487] According to this aspect, by simply controlling the second moving mechanism that moves the illumination system and the imaging system relative to the objective lens, it is possible to adjust the deviation in the optical conjugate relationship between the illumination system and the imaging system caused by the change in the working distance.

[0488] A twentieth aspect of some embodiments is that in any one of the thirteenth to fifteenth aspects, the second moving mechanism moves the illumination system relative to the objective lens and the imaging system along the optical axis direction of the objective lens.

[0489] According to this aspect, by simply controlling the second moving mechanism that moves the illumination system relative to the objective lens and the imaging system, it is possible to adjust the deviation in the optical conjugate relationship between the illumination system and the imaging system caused by the change in the working distance.

[0490] A twenty-first aspect of some embodiments is that, in any one of the thirteenth to fifteenth aspects, the second moving mechanism (third moving mechanism 46D) moves the objective lens relative to the illumination system and the imaging system along the optical axis direction of the objective lens.

[0491] According to this aspect, by simply controlling the second moving mechanism that moves the objective lens relative to the illumination system and the imaging system, it is possible to adjust the deviation in the optical conjugate relationship between the illumination system and the imaging system caused by the change in the working distance.

[0492] A twenty-second aspect of some embodiments is that in any one of the thirteenth to fifteenth aspects, the step of obtaining three-dimensional shape data of the face of the subject is included. In the contact determination step, it is determined whether a predetermined part of the face of the subject is in contact with a part of the device based on the three-dimensional shape data.

[0493] According to this aspect, it is possible to determine with high accuracy whether a part of the device is in contact with a predetermined part of the face of the subject.

[0494] A twenty-third aspect of some embodiments is that in any one of the thirteenth to fifteenth aspects, the method further comprises a detection step of detecting the proximity of the subject's face to the part of the device. A contact determination step of determining whether a predetermined part of the subject's face is in contact with the part of the device based on the detection result obtained in the detection step.

[0495] According to this method, it is not necessary to generate three-dimensional shape data of the subject's face, and it is possible to determine with high accuracy whether a part of the device is in contact with a predetermined part of the subject's face through a simple structure and simple control.

[0496] The twenty-fourth aspect of the embodiment is a program for causing a computer to execute each step of the method for controlling an ophthalmologic apparatus as described in any one of the thirteenth to fifteenth aspects.

[0497] According to this method, a procedure can be provided in which the subject's eye is photographed at different working distances according to the result of determining whether a part of the device is in contact with a predetermined part of the subject's face. Thus, the subject's eye can be photographed at a maximum viewing angle at which the device does not contact the subject's face while avoiding an increase in the diameter of the objective lens.

[0498] The above-described embodiment or its modified example is only an example for implementing the present invention, and a person who intends to implement the present invention can implement arbitrary modifications, omissions, additions, etc. within the scope of the gist of the present invention.

[0499] In the above-mentioned embodiment, the ophthalmic device may also have any function that can be used in the field of ophthalmology, such as an axial length measurement function, an intraocular pressure measurement function, an optical coherence tomography (OCT) function, an ultrasonic examination function, etc. In addition, the axial length measurement function is realized by an optical coherence tomography imager or the like. In addition, the axial length measurement function may also detect the return light from the fundus while projecting light onto the eye to be inspected and adjusting the position of the optical system relative to the Z direction (front-back direction) of the eye to be inspected, thereby measuring the axial length of the eye to be inspected. The intraocular pressure measurement function is realized by a tonometer or the like. The OCT function is realized by an optical coherence tomography imager or the like. The ultrasonic examination function is realized by an ultrasonic diagnostic device or the like. In addition, the present invention can also be applied to a device (compound machine) having two or more of these functions.

[0500] In the above-mentioned first to sixth embodiments, the case of using the image acquired by the camera 60A, 60B or the TOF camera 61 (or the off-axis illumination light source 65) to align the optical system of the subject's eye E is described. However, the structure involved in the embodiment is not limited to this. For example, the ophthalmic device involved in any of the above-mentioned embodiments may also include an alignment system. In some embodiments, the alignment system includes an XY alignment system and a Z alignment system. The XY alignment system is used to align the device optical system and the subject's eye E along a direction intersecting with the optical axis of the device optical system (objective lens 46). The Z alignment system is used to align the device optical system and the subject's eye E along the direction of the optical axis of the ophthalmic device 1 (objective lens 46).

[0501] For example, the XY alignment system projects a light spot (a light spot in the infrared range or near-infrared range) onto the eye to be inspected E. The data processing unit 200 (or the data processing unit 200e) acquires an anterior ocular image of the eye to be inspected E onto which the light spot is projected, and obtains a displacement between the light spot image depicted in the acquired anterior ocular image and the alignment reference position. The control unit relatively moves the device optical system and the eye to be inspected E in a direction intersecting the direction of the optical axis through a moving mechanism (not shown) so that the obtained displacement is eliminated.

[0502] For example, the Z alignment system projects an alignment light in the infrared range or near-infrared range from a position deviating from the optical axis of the apparatus optical system 70, and receives the alignment light reflected by the anterior ocular segment of the subject's eye E. The data processing unit 200 (or the data processing unit 200e) determines the distance of the subject's eye E from the apparatus optical system based on the light receiving position of the alignment light that changes correspondingly to the distance of the subject's eye E from the apparatus optical system 70. The control unit moves the apparatus optical system and the subject's eye E relatively along the direction of the optical axis through a moving mechanism (not shown) so that the determined distance becomes the desired working distance.

[0503] In some embodiments, a program for causing a computer to execute the control method of the above-mentioned ophthalmic device is provided. Such a program can be stored in any non-transitory recording medium that is readable by a computer. As the recording medium, for example, a semiconductor memory, an optical disk, an optical magnetic disk (CD-ROM / DVD-RAM / DVD-ROM / MO, etc.), a magnetic storage medium (hard disk / floppy (registered trademark) disk / ZIP, etc.) can be used. In addition, the program can also be sent and received via a network such as the Internet and a LAN.

Claims

1. An ophthalmic device comprising: The optical system comprises: an objective lens; an illumination system for irradiating illumination light to the eye of the subject via the objective lens; and a photographing system for receiving return light of the illumination light via the objective lens; a first moving mechanism for moving the optical system relative to the eye of the subject; A second moving mechanism, in the optical system, causes the objective lens, the illumination system, and the photographing system to relatively move along the optical axis direction of the objective lens; a contact determination section that determines whether a predetermined portion of the subject's face is in contact with a portion of the device due to movement by the first moving mechanism; and The control unit controls the second moving mechanism so that the working distance between the objective lens and the eye of the subject changes in response to the determination result obtained by the contact determination unit.

2. The ophthalmic device according to claim 1, wherein: When it is determined that the predetermined portion is not in contact with a part of the device, the control unit controls the first moving mechanism so that the working distance becomes a predetermined first working distance, and then causes the imaging system to receive the return light from the eye of the subject irradiated with the illumination light. When it is determined that the predetermined part is in contact with a part of the device, the control unit controls at least one of the first moving mechanism and the second moving mechanism so that the working distance becomes a second working distance greater than the first working distance, and controls the second moving mechanism to adjust the conjugate relationship in the optical system, and then enables the shooting system to receive the return light from the eye of the subject irradiated with the illumination light.

3. The ophthalmic device according to claim 2, wherein: When it is determined that the predetermined part is in contact with a part of the device, the control unit controls the second moving mechanism so that the optical conjugate relationship between the lighting system and the shooting system maintains a predetermined conjugate relationship, and controls the shooting system so that a focal position corresponding to the refractive power of the subject's eye is configured in the shooting system.

4. The ophthalmic device according to claim 2 or 3, characterized in that: The imaging system includes a focus position changing unit for changing the focus position of the return light. The control unit controls the focal position changing member according to the refractive power of the eye of the subject.

5. The ophthalmic device according to claim 4, characterized in that The ophthalmologic apparatus includes an aperture mirror that can be disposed at a position that is substantially optically conjugate with an iris of the subject's eye and that separates the optical path of the return light into an optical path of the illumination system and an optical path of the imaging system.

6. The ophthalmic device according to claim 5, characterized in that The lighting system comprises: light source; an iris aperture, illuminated by light from the light source; a slit through which light is irradiated through the iris aperture; and a light scanner that deflects light passing through the slit, When it is determined that the predetermined part is in contact with a part of the device, the control unit controls the lighting system so that the iris aperture and the light scanner are arranged at positions that are substantially optically conjugate with the iris, and the slit is arranged at a position that is substantially optically conjugate with the photographing part of the subject's eye.

7. The ophthalmic device according to claim 5, wherein: The imaging system includes an imaging element for receiving the return light. When it is determined that the predetermined part is in contact with a part of the device, the control unit controls the imaging system so that the imaging element is arranged at a position that is substantially optically conjugate with an imaging part of the eye of the subject.

8. The ophthalmic device according to any one of claims 1 to 3, characterized in that The second moving mechanism enables the illumination system and the imaging system to move relative to the objective lens along the optical axis direction of the objective lens.

9. The ophthalmic device according to any one of claims 1 to 3, characterized in that The second moving mechanism enables the illumination system to move relative to the objective lens and the imaging system along the optical axis direction of the objective lens.

10. The ophthalmic device according to any one of claims 1 to 3, characterized in that The second moving mechanism moves the objective lens relative to the illumination system and the imaging system along the optical axis direction of the objective lens.

11. The ophthalmic device according to any one of claims 1 to 3, characterized in that The ophthalmologic apparatus includes: a shape data acquisition unit that acquires three-dimensional shape data of the face of the subject; The contact determination unit determines whether a predetermined part of the face of the subject is in contact with a part of the device based on the three-dimensional shape data.

12. The ophthalmic device according to any one of claims 1 to 3, characterized in that The ophthalmologic apparatus includes a detection unit configured to detect proximity of the subject's face to a portion of the apparatus. The contact determination unit determines whether a predetermined part of the face of the subject is in contact with a part of the device based on the detection result obtained by the detection unit.

13. A method for controlling an ophthalmic device, the ophthalmic device comprising: The optical system comprises: an objective lens; an illumination system for irradiating illumination light to the eye of the subject via the objective lens; and a photographing system for receiving return light of the illumination light via the objective lens; a first moving mechanism for moving the optical system relative to the eye of the subject; and A second moving mechanism is used to relatively move the objective lens, the illumination system, and the photographing system along the optical axis of the objective lens in the optical system. The control method of the ophthalmic device comprises: a contact determination step of determining whether a predetermined portion of the subject's face is in contact with a portion of the device due to movement by the first moving mechanism; and A control step of controlling the second moving mechanism so that the working distance between the objective lens and the eye of the subject changes in response to the determination result obtained in the contact determination step.

14. The control method of an ophthalmic device according to claim 13, characterized in that: When it is determined that the predetermined portion is not in contact with a part of the device, the control step controls the first moving mechanism so that the working distance becomes a predetermined first working distance, and then causes the imaging system to receive the return light from the eye of the subject irradiated with the illumination light. When it is determined that the predetermined part is in contact with a part of the device, the control step controls at least one of the first moving mechanism and the second moving mechanism so that the working distance becomes a second working distance greater than the first working distance, and controls the second moving mechanism to adjust the conjugate relationship in the optical system, so that the shooting system receives the return light from the eye of the subject irradiated with the illumination light.

15. The control method of an ophthalmic device according to claim 14, characterized in that: When it is determined that the predetermined part is in contact with a part of the device, the control step controls the second moving mechanism so that the optical conjugate relationship between the lighting system and the shooting system maintains a predetermined conjugate relationship, and controls the shooting system so that a focal position corresponding to the refractive power of the subject's eye is configured in the shooting system.

16. The control method of an ophthalmic device according to claim 14 or 15, characterized in that: The imaging system includes a focus position changing unit for changing the focus position of the return light. The control step controls the focus position changing means according to the refractive power of the eye of the subject.

17. The control method of an ophthalmic device according to claim 16, characterized in that: The ophthalmologic apparatus includes an aperture mirror that can be disposed at a position that is substantially optically conjugate with an iris of the subject's eye and that separates the optical path of the return light into an optical path of the illumination system and an optical path of the imaging system. The lighting system comprises: light source; an iris aperture, illuminated by light from the light source; a slit through which light is irradiated through the iris aperture; and a light scanner that deflects light passing through the slit, When it is determined that the predetermined part is in contact with a part of the device, the control step controls the lighting system so that the iris aperture and the light scanner are arranged at positions that are substantially optically conjugate with the iris, and the slit is arranged at a position that is substantially optically conjugate with the photographing part of the subject's eye.

18. The control method of an ophthalmic device according to claim 16, characterized in that: The ophthalmologic apparatus includes an aperture mirror that can be disposed at a position that is substantially optically conjugate with an iris of the subject's eye and that separates the optical path of the return light into an optical path of the illumination system and an optical path of the imaging system. The imaging system includes an imaging element for receiving the return light. When it is determined that the predetermined part is in contact with a part of the device, the control step controls the imaging system so that the imaging element is arranged at a position that is substantially optically conjugate with an imaging part of the eye of the subject.

19. The method for controlling an ophthalmic device according to any one of claims 13 to 15, characterized in that: The second moving mechanism enables the illumination system and the imaging system to move relative to the objective lens along the optical axis direction of the objective lens.

20. The control method of an ophthalmic device according to any one of claims 13 to 15, characterized in that: The second moving mechanism enables the illumination system to move relative to the objective lens and the imaging system along the optical axis direction of the objective lens.

21. The control method of an ophthalmologic device according to any one of claims 13 to 15, characterized in that: The second moving mechanism moves the objective lens relative to the illumination system and the imaging system along the optical axis direction of the objective lens.

22. The control method of an ophthalmic device according to any one of claims 13 to 15, characterized in that: The control method of the ophthalmic device comprises: a shape data acquisition step of acquiring three-dimensional shape data of the face of the subject, The contact determination step determines whether a predetermined part of the subject's face is in contact with a part of the device based on the three-dimensional shape data.

23. The control method of an ophthalmic device according to any one of claims 13 to 15, characterized in that: The control method of the ophthalmic device comprises: a detection step of detecting the proximity of the face of the subject to the local part of the device, The contact determination step determines whether a predetermined part of the subject's face is in contact with a part of the device based on the detection result obtained in the detection step.

24. A computer program product, characterized in that The present invention comprises a computer program, and when the computer program is executed by a processor, each step of the control method of the ophthalmologic apparatus according to any one of claims 13 to 15 is implemented.

25. A computer-readable storage medium, characterized in that: A computer program is stored. When the computer program is executed by a processor, each step of the method for controlling an ophthalmologic apparatus according to any one of claims 13 to 15 is implemented.

Images