Ophthalmic device and cover member

Abstract

To provide an ophthalmological device that can suitably hide a state of movement of an eye information acquisition part, and can suitably acquire information of a subject's eye.SOLUTION: An ophthalmological device 10 comprises: a device body 20 comprising a base part 11, a frame 13, a measurement head (eye information acquisition part) 14 including an objective optical system 21, a driving part 12, and a control part 19; and a case 30. A cover member 40 covering an opening part 31 of the case 30 comprises: a first cover part 41 arranged in the opening part 31 so as to be movable vertically and horizontally with respect to the case 30 and immovable forward and backward; and a second cover part 42 fitted to an outer periphery of the objective optical system 21, and inserted into an insertion hole of the first cover part 41 so as to be movable immovable forward and backward relatively with respect to the first cover part 41.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an ophthalmic apparatus and a cover member. [Background technology]

[0002] There is known an ophthalmic device having an optical system including an objective lens, which moves an ophthalmic information acquisition unit that acquires information of the subject's eye in up-down, left-right, front-rear directions to align it with the subject's eye, and then acquires information of the subject's eye by the ophthalmic information acquisition unit (see, for example, Patent Document 1). In the ophthalmic device described in Patent Document 1, the device body including the ophthalmic information acquisition unit (optical system unit) is covered by a cover, and the ophthalmic information acquisition unit moves in up-down, left-right, front-rear directions within the cover, and the ophthalmic information acquisition unit acquires information of the subject's eye through an opening (photography window) provided in the cover. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-17279 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned conventional technology, when acquiring information on the subject's eye, the subject can see the movement of the eye information acquisition unit through the opening, especially the movement of the eye information acquisition unit moving forward and approaching the subject's eye, which may cause the subject to feel a sense of fear that an "object" is approaching the subject's eye or to be unable to concentrate on the examination. Furthermore, there is a possibility that the subject may mistakenly insert his / her finger through the imaging window, or that dirt, dust, foreign objects, etc. may enter.

[0005] The present invention has been made in consideration of the above circumstances, and has an object to appropriately hide the movement of an eye information acquisition unit and appropriately acquire information about a subject's eye. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the ophthalmic device disclosed herein includes an objective optical system facing the test eye of a subject, and comprises an apparatus main body having an eye information acquisition unit that acquires information of the test eye, a drive unit that moves the eye information acquisition unit in up-down, left-right, and front-to-back directions that are mutually perpendicular to the test eye, and a control unit that controls the eye information acquisition unit and the drive unit, and a housing that covers the apparatus main body, wherein the housing has an opening on one side facing the test eye, and a cover member that covers the opening, the cover member having a first cover portion that is freely movable in the up-down and left-right directions relative to the housing but is immovable in the front-to-back direction, and a second cover portion that is attached to the outer periphery of the objective optical system and is inserted into the first cover portion so as to be freely movable in the front-to-back direction relative to the first cover portion. Effect of the Invention

[0007] In the ophthalmic device of the present disclosure configured as described above, the first cover member moves vertically and horizontally along the housing within the opening in accordance with the vertical and horizontal movements of the eye information acquisition unit while appropriately covering the opening. On the other hand, when the eye information acquisition unit moves forward and backward, the movement of the first cover member is restricted, and the second cover member attached to the outer periphery of the objective optical system moves forward and backward together with the eye information acquisition unit. Therefore, the opening can be covered with the cover member without interfering with the movement of the eye information acquisition unit. As a result, the movement of the eye information acquisition unit can be appropriately concealed, and information on the subject's eye can be appropriately acquired. [Brief description of the drawings]

[0008] [Figure 1] 1 is a side view showing an external appearance of an ophthalmic apparatus according to a first embodiment of the present disclosure. [Diagram 2] 4A and 4B are explanatory diagrams for explaining the configuration of a cover member and a housing. [Diagram 3] 10A to 10C are explanatory diagrams for explaining an assembly process of the cover member and the housing. [Figure 4]13 is an explanatory diagram for explaining the configuration of a cover member and a housing of the first modified example. FIG. [Diagram 5] 13 is an explanatory diagram for explaining the configuration of a cover member and a housing of Modification 2. FIG. [Figure 6] 13 is an explanatory diagram for explaining the configuration of a cover member and a housing of Modification 3. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] (First embodiment) Hereinafter, an ophthalmic device 10 according to an embodiment of the present disclosure will be described with reference to the drawings. FIG. 1 is a side view showing the appearance of the ophthalmic device 10 according to the present embodiment. In this specification, the X-axis, Y-axis, and Z-axis are set as shown in FIG. 1. When viewed from the subject P, the left-right direction is the X-direction (the positive direction of the X-axis is the right direction, and the negative direction is the left direction), the up-down direction (vertical direction) is the Y-direction (the positive direction of the Y-axis is the up direction, and the negative direction of the Y-axis is the down direction), and the front-rear direction (the depth direction of the device main body 20, the subject P side is the front, and the opposite side is the back (rear)) is the Z-direction (the positive direction of the Z-axis is the front direction, and the negative direction is the rear direction). In addition, the front side (the subject P side) of the ophthalmic device 10 is the front, and the back side (the examiner side) is the back.

[0010] The ophthalmic apparatus 10 of the present embodiment is a fundus photographing apparatus for observing the fundus and photographing a fundus image of the subject's eye E. The ophthalmic apparatus of the present disclosure is not limited to a fundus photographing apparatus, and may be, for example, an ophthalmic apparatus capable of performing one or both of a subjective test and an objective test described below, an optical coherence tomography (OCT) apparatus, an axial length measuring apparatus, a tonometer, or the like.

[0011] 1, the ophthalmologic device 10 of this embodiment includes a device main body 20 having a base section 11, a drive section 12, a stand 13, a measurement head 14 as an eye information acquisition section, a chin rest section 15, a forehead rest section 16, an operation section 17, a display section 18, and a control section (control device) 19, and a housing (main body cover) 30 that covers the device main body 20. The base section 11, the drive section 12, the stand 13, the measurement head 14, and the control section 19 of the device main body 20 are covered by the housing 30, and the chin rest section 15, the forehead rest section 16, and the operation section 17 protrude from the housing 30 to the outside.

[0012] In the ophthalmologic apparatus 10 of this embodiment, a stand 13 is provided on a base unit 11 via a drive unit 12, and the drive unit 12 enables the stand 13 to move in the front-back and left-right directions (Z direction and X direction) relative to the base unit 11. A control unit 19 and a measurement head 14 are provided on the stand 13. The measurement head 14 is capable of moving in the up-down direction (Y direction) relative to the stand 13 by the drive unit 12.

[0013] In this embodiment, the base portion 11 is also covered by the housing 30, but this is not limited to this, and the housing 30 may be fixed to the base portion 11 and cover the stand 13, measuring head 14, drive unit 12, control unit 19, etc. on the base portion 11.

[0014] The base unit 11 is provided with a chin rest 15 and a forehead rest 16 for fixing the position of the face of the subject P, i.e., the position of the eye E to be examined, relative to the measurement head 14 when acquiring eye information. The chin rest 15 and the forehead rest 16 are vertically movable relative to the base unit 11 by a known drive unit (or manually). In this ophthalmologic device 10, the subject P faces the measurement head 14 with his / her forehead in contact with the forehead rest 16 and his / her chin placed on the chin rest 15, and then the information is acquired by observing, photographing, examining, etc. the eye E to be examined.

[0015] The operation unit 17 is operated by the examiner or the subject P to give instructions for the operation and settings of the ophthalmic apparatus 10, i.e., the chin rest 15, the measuring head 14, and the drive unit 12. The operation unit 17 in this embodiment has an operation lever 17a provided on the stand 13 so as to be tiltable. The examiner can operate this operation lever 17a to move the measuring head 14 in three-dimensional directions relative to the base unit 11. In addition, a button switch 17b is provided on the top of the operation lever 17a. The examiner can start eye examination using the measuring head 14 by pressing this button switch 17b.

[0016] The operation unit 17 also has software keys such as operation buttons displayed on the display surface 18a of the display unit 18. By operating these operation buttons, it is possible to perform various operations such as alignment with the subject's eye E, setting various examination conditions, and adjusting the display surface 18a. The operation unit 17 may also have input devices such as various buttons, a keyboard, and a mouse provided around the operation lever 17a or around the display unit 18.

[0017] The display unit 18 is attached to the top of the housing 30. The display unit 18 is, for example, a liquid crystal display device (LCD monitor) and has a touch panel type display surface 18a. Under the control of the control unit 19, the display unit 18 appropriately displays images such as an anterior segment image, a fundus image, and an OCT image of the subject's eye E based on image data from the measurement head 14, various examination information from the measurement head 14 (examiner information, examination conditions, examination results, measurement images, etc.), and images of operation buttons as the operation unit 17. The display unit 18 of this embodiment is rotatably supported by the housing 30 via the rotation support mechanism unit 18b, and the orientation of the display surface 18a can be appropriately changed. For example, the display surface 18a can be directed toward the subject side or the side (X direction).

[0018] The control unit 19 comprehensively controls each unit of the ophthalmic apparatus 10. The control unit 19 is configured to include a CPU, and a storage unit such as a RAM, a ROM, an EEPROM, a hard disk drive, etc. The control unit 19 is connected to the drive unit 12, the chin rest unit 15, the operation unit 17, the display unit 18, the measurement head 14, the storage unit, etc. The control unit 19 comprehensively controls the operation of the ophthalmic apparatus 10 (the drive unit 12, the chin rest unit 15, the display unit 18, and the measurement head 14) in response to the operation of the operation unit 17, etc., by expanding a computer program stored in advance in the storage unit, for example, on the RAM.

[0019] The measurement head (ocular information acquisition unit) 14 acquires ocular information of the subject's eye E. Examples of the ocular information include images of the anterior segment of the subject's eye E, an image of the fundus of the subject's eye E, a tomographic image of the retina of the subject's eye E, and the like, as well as images of the corneal endothelium of the subject's eye E, the refractive power of the subject's eye E, the corneal shape of the subject's eye E, characteristics of the subject's eye E such as intraocular pressure, and the like.

[0020] The measurement head 14 has an objective optical system unit 21 that faces the subject's eye E, and a measurement optical system 22 that includes optical elements such as a relay lens, an imaging element, an eyepiece, and a light source. The objective optical system unit 21 has an objective optical system 21a consisting of one or more objective lenses, and a lens barrel 21b that houses the objective optical system 21a. As shown in FIG. 1, the objective optical system unit 21 protrudes to the outside from an opening 31 provided on the front side (the side of the subject's eye E) of a housing 30, so that the objective optical system 21a can face the subject's eye E.

[0021] The measurement head 14 performs at least one of subjective testing and objective measurement. The subjective testing is a measurement method that uses a response from the subject P to obtain information on the subject's eye E. The subjective testing includes subjective refraction measurements such as distance testing, near testing, contrast testing, and glare testing, and visual field testing. The objective measurement is a measurement method that obtains information on the subject's eye E mainly using physical methods without referring to the response from the subject P. The objective measurement includes a measurement for obtaining characteristics of the subject's eye E and photography for obtaining an image of the subject's eye E. The objective measurement includes objective refraction measurement, corneal shape measurement, intraocular pressure measurement, fundus photography, and optical interference measurement. Since the ophthalmic apparatus 10 of this embodiment is an ophthalmic photography apparatus, the measurement head 14 mainly performs fundus photography.

[0022] The objective optical system unit 21 is disposed in the opening 31 of the housing 30 so as to be movable in the up-down, left-right and front-rear directions. Therefore, the opening 31 is formed to have a size that does not impede the movement of the objective optical system unit 21 in the up-down, left-right and left-right directions. That is, the opening 31 is formed to have a dimension that includes a length obtained by adding the outer diameter dimension of the objective optical system unit 21 and a second cover part 42 (described later) that houses the objective optical system unit 21, and the movement distance in the left-right direction or the movement distance in the up-down direction, respectively, in the up-down and left-right directions.

[0023] For this reason, in the past, the subject P could see the internal measurement head 14 from the opening 31 without the cover member 40, and could see how the measurement head 14 moved up and down, left and right, and back and forth. In particular, when the measurement head 14 moved forward, the subject P may feel a sense of fear that the measurement head 14 was approaching. As a result, the subject P could not concentrate on the examination, could not fixate the visual target well, or could move his face away from the chin rest 15 or the forehead rest 16, which could affect the acquisition of eye information. In addition, the subject P may accidentally insert his finger through the opening 31, or dirt, dust, or foreign matter may get in. Covering the opening 31 with a curtain or the like has been considered, but the curtain may open as the objective optical system unit 21 moves, making it difficult to properly hide the inside of the housing 30.

[0024] In order to eliminate such inconvenience, in the ophthalmic device 10 of this embodiment, as shown in Figures 1 and 2, a cover member 40 is attached to the opening 31 to cover the opening 31, thereby preventing the subject P from seeing the inside of the housing 30.

[0025] The details of the cover member 40 will be described with reference to Fig. 2. Fig. 2(a) is a front view of the cover member 40 and the vicinity of the engagement receiving portion 32 of the housing 30, and Fig. 2(b) is a side view (cross-sectional view) thereof. Fig. 2(c) is a side view (cross-sectional view) of the cover member 40 in a state where it has been moved to a position different from that shown in Fig. 2(b).

[0026] 2(a) and 2(b), the cover member 40 has a first cover portion 41 disposed in the opening 31, and a second cover portion 42 attached to the outer periphery of the objective optical system unit 21. The first cover portion 41 is disposed in the opening 31 so as to be movable in the up-down and left-right directions relative to the housing 30, but not in the front-rear direction. The second cover portion 42 is inserted into the first cover portion 41 so as to be movable in the front-rear direction relative to the first cover portion 41. That is, the first cover portion 41 and the second cover portion 42 form a nested structure (telescopic structure).

[0027] The first cover portion 41 has a convex shape when viewed from the side, and has a disk-shaped base portion 43 that is placed in the opening 31, and a cylindrical guide portion 44 that protrudes from this base portion 43 toward the subject's eye E (forward).

[0028] The substrate portion 43 has a function of covering the opening 31 and also has a function as an engagement portion for the opening 31. That is, the substrate portion 43 engages with an engagement receiving portion 32 provided along the opening 31 on the inner surface of the housing 30. This engagement receiving portion 32 is ring-shaped in plan view and U-shaped in cross section, and has a pair of gripping walls 33 that grip the substrate portion 43, and a storage space 34 that is partitioned by the pair of gripping walls 33 and stores the substrate portion 43. The distance between the inner surfaces of the pair of gripping walls 33 (the width of the storage space 34) is formed to be approximately the same as the thickness (length in the front-rear direction) of the substrate portion 43.

[0029] Therefore, the substrate 43 is freely movable in the up-down and left-right directions (i.e., in the XY plane) in the accommodation space 34 while contacting the inner surfaces of the pair of gripping walls 33 to close the opening 31, and movement in the front-rear direction is restricted (prevented). When the first cover part 41 moves in the XY plane, the outer periphery of the substrate 43 abuts against the bottom surface 35 of the accommodation space 34, or the outer periphery of the guide part 44 abuts against the periphery of the opening 31, so that further movement is restricted. Therefore, the engagement receiving part 32 functions as a movement control part that allows the first cover part 41 to move a predetermined distance in the up-down and left-right directions while restricting movement in the front-rear direction, and also functions as a part that prevents the cover member 40 from coming off the opening 31. In addition, the opening 31 is closed by the substrate 43, so that the intrusion of dust and the like into the inside of the housing 30 from the opening 31 and the insertion of fingers and the like are appropriately prevented.

[0030] The guide portion 44 of the first cover portion 41 has a cylindrical shape with both ends open, and has an inward flange 44a protruding toward the center from the periphery of one (front) end portion facing the subject's eye E. The inner periphery of this inward flange 44a forms an insertion hole 44b through which the second cover portion 42 is inserted.

[0031] In this embodiment, the engagement receiving portion 32, which is a separate member from the housing 30, is fixed to the inner surface of the housing 30, but the present invention is not limited to this configuration. For example, a member having an L-shape in cross section can be fixed to the inner surface of the housing 30, and the engagement receiving portion can be formed by the wall surface of this member and the wall surface of the housing 30. Also, the wall surface of the housing 30 can be made thick and hollowed out along the inner periphery of the opening 31 to provide an accommodation space, which can be used as the engagement receiving portion.

[0032] The second cover part 42 is made of a tubular member (a cylindrical member in this embodiment) with both ends open, and has an accommodation space 45 for accommodating the objective optical system unit 21. That is, the second cover part 42 is attached to the outer periphery of the objective optical system unit 21, and is movable in the up-down direction, the left-right direction, and the front-rear direction together with the measurement head 14 including the objective optical system unit 21. The second cover part 42 is inserted into the insertion hole 44b of the guide part 44 of the first cover part 41 so as to be movable in the front-rear direction. The inner diameter dimension of this insertion hole 44b and the outer diameter dimension of the second cover part 42 are approximately the same, and the second cover part 42 is movable in the front-rear direction while contacting the inner surface of the insertion hole 44b while blocking the insertion hole 44b, but the movement in the up-down direction and the left-right direction relative to the first cover part 41 is restricted.

[0033] Therefore, when the measuring head 14 moves in the front-rear direction, the second cover part 42 moves independently in the front-rear direction within the guide part 44 of the first cover part 41, and when the measuring head 14 moves in the up-down direction and the left-right direction, the first cover part 41 moves in the up-down direction and the left-right direction together with the second cover part 42. In addition, the intrusion of dust and the like into the inside of the housing 30 through the insertion hole 44b is also prevented.

[0034] The second cover portion 42 is provided at its other (rear) end with an outward flange 46 that protrudes radially outward from the periphery of the end. The outward flange 46 is formed with a dimension that allows it to come into contact with a guide surface 44c of the guide portion 44 of the first cover portion 41. When the second cover portion 42 moves in the front-rear direction, the outward flange 46 moves along the guide surface 44c while coming into contact with the guide surface 44c. The guide portion 44 appropriately guides the movement of the second cover portion 42 in the front-rear direction, and suppresses rattling, vibration, and the like during movement, thereby supporting smooth movement of the second cover portion 42.

[0035] Furthermore, when the second cover part 42 moves forward, the outward flange 46 abuts against the inward flange 44a of the guide part 44, restricting further movement. Thus, the outward flange 46 and the inward flange 44a also function as a movement control part for the second cover part 42 and a part preventing it from coming off.

[0036] The distance traveled in the forward and backward directions of the second cover part 42 is approximately equal to the distance traveled in the forward and backward directions of the measuring head 14 (working distance for alignment). In addition, when the measuring head 14 moves forward to the maximum extent together with the second cover part 42, it is preferable that the outward flange 46 abuts against the inward flange 44a, or is disposed at a position with a predetermined margin without abutting. In contrast, when the measuring head 14 moves backward to the maximum extent together with the second cover part 42, it is preferable that one (front) end face of the first cover part 41 (more specifically, the guide part 44) and one (front) end face of the second cover part 42 are flush with each other, as shown in FIG. 2(c). By forming each member with dimensions adjusted to achieve such a configuration, it is possible to prevent the second cover part 42 from coming off the first cover part 41 or from falling off the objective optical system unit 21, and to prevent any influence on the movement of the measuring head 14.

[0037] The material of the first cover part 41 and the second cover part 42 is not particularly limited, and metal materials, resin materials, etc. can be used, but it is desirable to use a resin material from the viewpoints of reducing costs, improving adhesion between members, reducing friction noise and wear caused by rubbing between members, etc. Examples of the resin material include, but are not limited to, polycarbonate resin, ABS resin, polyacetal resin, nylon resin, etc.

[0038] In addition, as the material for the first cover portion 41, the second cover portion 42, and further the engagement receiving portion 32, for example, a resin material having elasticity, such as polyurethane resin or polyester resin, is also suitably used. By using such a resin material, the adhesion of the sliding portion, which is the contact portion between the engagement receiving portion 32 and the first cover portion 41, and the sliding portion between the first cover portion 41 and the second cover portion 42, is improved, and the formation of a gap through which dust or the like can enter can be further suppressed. In addition, even if one of two parts that contact each other is formed from an elastic resin material and the other is formed from a relatively hard resin material, they can be in close contact with each other to suppress the formation of a gap, and smooth movement is possible.

[0039] It is also preferable to provide a friction reducing member for reducing frictional resistance on the sliding portion (contact surface) between the engagement receiving portion 32 and the first cover portion 41 and the sliding portion (contact surface) between the first cover portion 41 and the second cover portion 42. Suitable examples of the friction reducing member include a fluororesin-processed surface of the sliding portion (contact surface) and a fluororesin-processed sheet. It is also preferable to dispose a slide bearing on the sliding portion (contact surface). This reduces friction on the sliding portion, appropriately suppresses the generation of sliding noise and wear, and suppresses rattling and vibration, allowing the first cover portion 41 and the second cover portion 42 to move more smoothly.

[0040] Moreover, the moving distances of the first cover part 41 in the vertical and horizontal directions are almost the same as the moving distances of the measurement head 14 in the vertical and horizontal directions. The measurement head 14 moves in the vertical direction according to the vertical distance between the base part 11 and the chin rest part 15, and the vertical distance between the chin rest part 15 and the test eye E. In addition, in the ophthalmic device 10 that acquires the eye information of one of the left and right test eyes E and then acquires the eye information of the other, the measurement head 14 moves in the horizontal direction from the position of one test eye E to the position of the other test eye E. In other words, since the measurement head 14 moves at least the length of the interpupillary distance PD between the left and right test eyes E, the first cover part 41 also moves together with the second cover part 42 by a moving distance corresponding to the interpupillary distance PD.

[0041] In consideration of the above, the opening 31 is opened to a size that does not prevent the movement of the first cover part 41 over this vertical and horizontal movement distance. The base plate part 43 of the first cover part 41 is formed to have a size (surface area) that can always close the opening 31 even when it moves over this vertical and horizontal movement distance.

[0042] The procedure for assembling the cover member 40 and the housing 30 as described above will be described with reference to FIG. 3. FIG. 3 is a plan view of the cover member 40 and the housing 30 as viewed from above, illustrating the procedure for assembling the cover member 40 and the housing 30. As shown in FIG. 3, the housing 30 is made up of two left and right parts (housings 30a and 30b), and the engagement receiving portion 32 is also divided into two left and right parts (engagement receiving portions 32a and 32b), which are fixed to the inner surfaces of the housings 30a and 30b. The two housings 30a and 30b are arranged around the device body 20 from the left and right directions, and are connected to each other by a fitting structure such as a recess and protrusion or a fixing member such as a screw, thereby covering the device body 20. Note that the housing 30 is not limited to this configuration, and may have any configuration that can hold the first cover portion 41.

[0043] First, in the device body 20 in which the drive unit 12, the stand 13, the measurement head 14, the control unit 19, etc. are assembled on the base unit 11, the second cover unit 42 is attached to the outer periphery of the objective optical system unit 21 of the measurement head 14 as shown in Fig. 3. Next, the first cover unit 41 is moved backward from the front of the second cover unit 42 to place the first cover unit 41 on the outer periphery of the second cover unit 42. At this time, the second cover unit 42 is inserted into the guide unit 44 of the first cover unit 41, and one end side of the second cover unit 42 is protruded from the insertion hole 44b.

[0044] Next, the two housings 30a, 30b are attached to the device body 20 from the left and right directions, and the base plate portion 43 of the first cover portion 41 is engaged with the engagement receiving portions 32a, 32b. Then, the two housings 30a, 30b are connected to complete the assembly of the cover member 40 to the housing 30. Since the housing 30 and the cover member 40 have such an assembly structure, the first cover portion 41 is held in a fixed state in the housing 30, and movement in the front-rear direction and falling off are appropriately prevented. In addition, the action of the inward flange 44a and the outward flange 46 prevents the second cover portion 42 from falling off the first cover portion 41.

[0045] On the other hand, when disassembling these, the procedure for assembly can be reversed. First, the housings 30a, 30b are released from the device body 20. Next, the first cover part 41 is moved forward to remove it from the second cover part 42, and then the second cover part 42 is moved forward to pull it out from the tip of the objective optical system unit 21. In this way, the cover member 40 and the housing 30 can be easily assembled and disassembled.

[0046] The effect of the cover member 40 when acquiring eye information using the ophthalmic device 10 configured as described above will be described. First, the subject P faces the ophthalmic device 10 with his / her forehead against the forehead rest 16 and his / her chin on the chin rest 15. Next, the examiner operates the operation unit 17 to select the subject eye E from which eye information is to be acquired and to give an instruction for alignment. The control unit 19 that receives this instruction signal drives the drive unit 12 to move the measurement head 14 in the vertical and horizontal directions, and aligns the measurement head 14 in the vertical and horizontal directions. At this time, the objective optical system unit 21 and the second cover unit 42 and the first cover unit 41 that accommodate it move in the vertical and horizontal directions within the opening 31 of the housing 30 in accordance with the movement of the measurement head 14. For this reason, the opening 31 is always covered by the first cover unit 41, and the subject P does not visually recognize the movement of the measurement head 14 inside the housing 30.

[0047] In addition, the control unit 19 moves the measurement head 14 in the front-rear direction to align it in the front-rear direction. Following the movement of the measurement head 14, the objective optical system unit 21 and the second cover part 42 move in the front-rear direction inside the first cover part 41, but the first cover part 41 engaged with the engagement receiving part 32 of the housing 30 does not move in the front-rear direction and keeps covering the opening 31. Therefore, the subject P cannot visually recognize the movement of the measurement head 14 itself in the front-rear direction. Therefore, the subject P does not feel a sense of fear that the measurement head 14 is approaching the subject's eye E, and can concentrate on obtaining eye information.

[0048] When this alignment is complete, the control unit 19 receives a measurement instruction from the examiner via the operation unit 17, or automatically controls the measurement head 14 to acquire eye information of the subject's eye E. Since the subject P can concentrate on acquiring eye information, the acquisition of eye information can be executed appropriately and efficiently. In addition, by attaching the cover member 40 to the opening 31, it is possible to appropriately prevent dirt, dust, foreign objects, etc. from entering through the opening 31, and to prevent fingers, etc. from being inserted by mistake.

[0049] As a result, it is possible to provide an ophthalmologic apparatus 10 and a cover member 40 that can appropriately hide the movement of the measurement head 14 as an eye information acquisition unit and appropriately acquire information about the subject's eye. In addition, it is possible to provide a cover member 40 having such excellent effects that has a simple configuration consisting of a first cover portion 41 and a second cover portion 42, and that is easy to assemble and disassemble.

[0050] (Modification) Next, the cover members 40A to 40C of the modified examples 1 to 3 will be described with reference to Figs. 4 to 6. Figs. 4 to 6 (a) are front views of the vicinity of the cover members 40A to 40, and (b) are side views (sectional views). The cover members 40A to 40C of the modified examples 1 to 3 have the same basic configuration as the first embodiment, and are configured to have a first cover portion 41 and a second cover portion 42. Therefore, the same components as those in the first embodiment are given the same reference numerals as those in the first embodiment, and detailed description is omitted. Below, the configurations different from the first embodiment will be described.

[0051] First, a cover member 40A of modified example 1 shown in Fig. 4(a) and Fig. 4(b) will be described. In the cover member 40 of the first embodiment, the substrate portion 43 is used as an engagement portion, and an engagement receiving portion 32 that engages with the substrate portion 43 is provided on the housing 30. In contrast, the cover member 40A of modified example 1 uses a wall surface near the periphery of the opening 31 of the housing 30 as an engagement portion 36, and an engagement receiving portion 47 that engages with the engagement portion 36 is provided on the substrate portion 43. The substrate portion 43 of modified example 1 is composed of two disk-shaped gripping walls 47a arranged at a distance substantially equal to the thickness of the wall surface of the housing 30 in the front-rear direction, and the space between the gripping walls 47a is used as an accommodation space 47b that accommodates (engages) the engagement portion 36.

[0052] In the first modification, the second cover part 42 and the first cover part 41 housing the objective optical system unit 21 move in the vertical and horizontal directions in accordance with the vertical and horizontal movements of the measurement head 14. At this time, the first cover part 41 moves in the opening 31 along the engaging part 36 while gripping the engaging part 36. In addition, the outer peripheral surface (bottom surface 47c) of the guide part 44 hits the periphery of the engaging part 36 in the housing space 47b, thereby restricting the movement of the first cover part 41. In addition, in the front-rear direction, the engagement between the engaging part 36 and the gripping wall 47a of the engagement receiving part 47 restricts the movement of the first cover part 41 in the front-rear direction, and only the second cover part 42 housing the objective optical system unit 21 moves in the front-rear direction. Therefore, the cover member 40A of the first modification can obtain the same action and effect as the first embodiment, and can further simplify the structure in the vicinity of the opening 31 of the housing 30.

[0053] In a cover member 40B of a second modified example shown in Fig. 5(a) and Fig. 5(b), a first cover portion 41 is composed only of a disk-shaped base plate portion 43. This base plate portion 43 is engaged with an engagement receiving portion 32 of a housing 30 so as to be movable in the up-down and left-right directions, and a second cover portion 42 is inserted into an insertion hole 43a provided in the base plate portion 43 so as to be relatively movable in the front-rear direction. In this second modified example, the same effects as those of the first embodiment can be obtained, and a cover member 40B having a simpler configuration can be provided.

[0054] A cover member 40C of Modification 3 shown in Fig. 6(a) and Fig. 6(b) is used in an ophthalmic device having stereo cameras (imaging units) 23a, 23b that capture an image of the subject's eye E (subject's eye image) for alignment. In this ophthalmic device, a measurement optical system 22 housed in a measurement head 14 includes an objective optical system unit 21, a lens, an imaging element, and other optical elements, and further has stereo cameras 23a, 23b and a light source 24 for illumination. A total of four light sources 24 are provided, one pair for each of the stereo cameras 23a, 23b, near each of the stereo cameras 23a, 23b.

[0055] In the cover member 40C of the third modification, the second cover portion 42 is made of a rectangular cylindrical member that is long in the left-right direction in a plan view as shown in Fig. 6(a) so that the objective optical system unit 21, the stereo cameras 23a and 23b, and the four light sources 24 can all be accommodated. Note that the second cover portion 42 is not limited to a rectangular cylindrical member, and may be made of an elliptical cylindrical member that is elliptical or oblong in a plan view, for example. The second cover portion 42 can be made to have an appropriate shape depending on the design, the angle of view of the stereo cameras 23a and 23b, the arrangement, etc.

[0056] The first cover part 41, through which the second cover part 42 is inserted, has a guide part 44 made of a square tubular member having a rectangular insertion hole 44b, and the substrate part 43 is also formed in a rectangular shape. The engagement receiving part 32 that engages the substrate part 43 and the opening part 31 are also formed in a rectangular shape, but are not limited to a rectangular shape. They may be formed in a shape and size that can adequately cover the opening part 31 without interfering with the movement of the objective optical system unit 21 and the stereo cameras 23a and 23b according to the vertical and horizontal movement distances of the measurement head 14. The cover member 40C of the third modification may also be configured to have an engagement receiving part 47 as in the first modification, or may be configured to have a first cover part 41 consisting of only the substrate part 43 as in the second modification.

[0057] The cover member 40C of the third modified example houses all of the objective optical system unit 21, the stereo cameras 23a and 23b, and the four light sources 24, but is not limited thereto. For example, it may be formed of a cylindrical member and configured to house only the objective optical system unit 21, similar to the second cover part 42 of the first embodiment. In this case, openings through which the stereo cameras 23a and 23b and the light source 24 can be seen are provided on the left and right sides of the insertion hole 44b in the inward flange 44a or the base plate part 43 of the first cover part 41. It is desirable to place a glass plate in this opening to prevent the intrusion of dust and the like. Even with such a configuration, the first cover part 41 and the second cover part 42 move in the vertical and horizontal directions together with the objective optical system unit 21, the stereo cameras 23a and 23b, and the light source 24. In addition, even if the objective optical system unit 21, the stereo cameras 23a and 23b, and the light source 24 move in the front-rear direction relative to the first cover portion 41, the opening is located on the optical path (on the optical axis) of the stereo cameras 23a and 23b, etc. Therefore, the subject's eye E can be photographed by the stereo cameras 23a and 23b through the opening of the first cover portion 41.

[0058] The above describes the ophthalmic device of the present disclosure based on embodiments and modified examples. However, the specific configuration is not limited to these embodiments and modified examples, and design changes and additions, etc. are permitted as long as they do not deviate from the gist of the disclosure related to each claim in the scope of the claims.

[0059] For example, in the above embodiment and modified example, the measuring head 14 is configured to move in the up-down, left-right, and front-back directions, but the measuring head 14 may also be configured to swing about an axis parallel to the Y-axis direction. With this configuration, the eye information of the subject's eye E can be obtained not only from the front, but also from any desired angle. Also, the measuring head 14 may be configured to move in one or two directions among the up-down, left-right, and front-back directions.

[0060] In the above embodiment, the display unit 18 is provided rotatably by the rotation support mechanism 18b, but the present invention is not limited to this. For example, the display unit 18 may be fixedly attached to the housing 30 so as not to rotate. Also, the display unit 18 may be detachable from the housing 30 and connected to the control unit 19 via short-range wireless communication such as Wi-Fi (registered trademark) or Bluetooth (registered trademark) so as to be able to transmit and receive data. [Explanation of symbols]

[0061] 10: Ophthalmic device 12: Drive unit 14: Measuring head (eye information acquisition unit) 19: Control unit 20: device body 21a: objective optical system 23a, 23b: Stereo camera (photographing unit) 30: Housing 31: Opening 32: Engagement receiving portion 36: Engagement portion 40, 40A, 40B, 40C: Cover members 41: First cover part 42: Second cover part 43: Base plate portion 44: Guide portion 46: Outward flange 47: Engagement receiving portion E: Subject's eye P: Subject

Claims

1. an eye information acquiring unit including an objective optical system opposed to an eye to be examined of a subject and acquiring information of the eye to be examined; a drive unit that moves the eye information acquisition unit in a vertical direction, a horizontal direction, and a front-rear direction perpendicular to each other with respect to the subject's eye; a control unit for controlling the eye information acquisition unit and the drive unit; and A housing that covers the device body, an opening is provided on one surface of the housing facing the subject's eye, and a cover member is provided on the opening to cover the opening; The cover member is a first cover portion that is disposed in the opening and is movable in a vertical direction and a horizontal direction relative to the housing but is immovable in a front-rear direction; a second cover portion that is attached to an outer periphery of the objective optical system and is inserted into the first cover portion so as to be movable in a front-rear direction relative to the first cover portion, the first cover portion has an engaging portion provided on one of the opening of the housing and the first cover portion, and an engaging receiving portion provided on the other, and the first cover portion is attached to the housing such that, by engagement between the engaging portion and the engaging receiving portion, the first cover portion is permitted to move a predetermined distance in the up-down direction and the left-right direction, and movement in the front-rear direction is restricted; an ophthalmic device characterized in that the engagement receiving portion has a pair of gripping walls that grip the engagement portion, a storage space partitioned by the pair of gripping walls to store the engagement portion, and a bottom surface against which the outer edge of the engagement portion moving within the storage space abuts, and the width of the storage space, which is the distance between the inner surfaces of the pair of gripping walls, is formed to be approximately the same as the thickness of the engagement portion.

2. An ophthalmic device as described in claim 1, characterized in that the engagement receiving portion is ring-shaped or rectangular in a planar view, and has a C-shape or U-shape in a cross-sectional view.

3. 3. The ophthalmic device according to claim 1, wherein the first cover portion has a base portion that is placed in the opening, and a guide portion that protrudes from the base portion toward the test eye and guides the second cover portion to move in a forward and backward direction.

4. The ophthalmic device according to claim 3 , characterized in that the second cover portion has an outward flange at an end portion facing the housing, which protrudes radially outward and is positioned between an outer surface of the second cover portion and an inner surface of the guide portion.

5. The ophthalmic device according to any one of claims 1 to 4, characterized in that the eye information acquisition unit has two or more photographing units that photograph the test eye from different directions, and the second cover unit is attached to the outer periphery of the photographing units and the objective optical system.

6. The ophthalmic device according to claim 1, characterized in that a friction reduction member that reduces frictional resistance is provided on at least one of the contact surfaces between the housing and the first cover portion and the contact surfaces between the first cover portion and the second cover portion.

7. A cover member is provided at an opening of a housing of an ophthalmologic apparatus, the cover member including an objective optical system facing an eye to be examined of a subject, and an eye information acquisition unit that acquires information of the eye to be examined is provided to be movable in a vertical direction, a horizontal direction, and a front-rear direction perpendicular to the eye to be examined, the cover member comprising: a first cover portion that is disposed in the opening and is movable in a vertical direction and a horizontal direction relative to the housing but is immovable in a front-rear direction; a second cover portion that is attached to an outer periphery of the objective optical system and is inserted into the first cover portion so as to be movable in a front-rear direction relative to the first cover portion, the first cover portion has an engaging portion provided on one of the opening of the housing and the first cover portion, and an engaging receiving portion provided on the other, and the first cover portion is attached to the housing such that, by engagement between the engaging portion and the engaging receiving portion, the first cover portion is permitted to move a predetermined distance in the up-down direction and the left-right direction, and movement in the front-rear direction is restricted; A cover member characterized in that the engagement receiving portion has a pair of gripping walls that grip the engagement portion, a storage space partitioned by the pair of gripping walls to accommodate the engagement portion, and a bottom surface against which the outer edge of the engagement portion moving within the storage space abuts, and the width of the storage space, which is the distance between the inner surfaces of the pair of gripping walls, is formed to be approximately the same as the thickness of the engagement portion.

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