Refractometry apparatus

Abstract

A refraction measuring apparatus which measures the refractive properties of an eye by two light beams passing through two holes respectively, the apparatus comprising: a first rotating member rotatably supported around a first rotation center, equipped with two holes on either side of the first rotation center; a second rotating member rotatably supported around a second rotation center, equipped with light-transmitting portion(s) and light-blocking portion at different rotating direction positions. When the first rotating member rotates, the second rotating member rotates while the hole arrangement direction of the two holes changes with the rotation of the second rotating member, into a light-transmitting state in which the light-transmitting portion coincides with the two holes to allow the two light beams to pass through, or into a light-blocking state in which the light-blocking portion coincides with the two holes to shield the two light beams.

Description

Background of the Invention 1. Technical Field

[0002] This disclosure relates to a refractive measuring apparatus for measuring the refractive properties of the human eye. 2. Background Technology

[0004] When prescribing eyeglasses or contact lenses, a refractive test is performed to measure the refractive properties of the eye. Subjective tests of the visibility of presented visual targets (markers) or light, and objective tests of the light incident on the eyeball from an external perspective, are examples of refractive tests known in the art.

[0005] As an example of subjective testing, examinations using interchangeable lenses (lens elements) are widely used when a subject is looking at a visual acuity chart (e.g., optometric font). The optimal refractive power (the refractive power facing the frontal direction for achieving best visual acuity) is found by changing the corrective lens placed in front of the subject's eyes, as done by the optometrist. The advantage of this type of examination using interchangeable lenses is that it can be performed using a simple structure comprising a retainer and a set of corrective lenses (optometry lens assembly) mounted on the retainer. On the other hand, this operation is often cumbersome and a significant burden on both the subject and the person performing the measurements (e.g., the optometrist) because the same visual acuity test needs to be repeated while changing a large number of corrective lenses. Furthermore, achieving accurate judgment is also a difficult task, as this type of examination relies on the subject remembering what they saw with previously worn corrective lenses and comparing it to what they saw with subsequently worn corrective lenses.

[0006] In refractometers, which are examination devices with multiple preset corrective lenses, the hassle of changing corrective lenses is reduced. However, compared to retainer components with small and simple structures, refractometers require a large amount of installation space and the equipment itself tends to be expensive.

[0007] While examination devices such as automated refractometers used in objective testing can perform efficient examinations in a short time without requiring the skills of the person performing the measurement, such devices are very expensive. Furthermore, they require a large installation space.

[0008] In view of the above problems, Patent Document 1 (Japanese Unexamined Patent Publication No. 2020-103743) proposes an apparatus and method in which an eye refraction test can be performed by subjective testing. Such an apparatus and method utilizes the Scheiner principle, in which a measuring disc provided in front of the eye is equipped with two (pinhole) holes through which light is confined (narrowed) and passes through both holes, and the refractive properties of the eye are measured based on the positional relationship of the first and second beams (images) as the eye views the light passing through the two holes and reaching the retina. In the disclosure of Patent Document 1, different transmission properties are established at the two holes, enabling high-precision testing by setting the first and second beams to pass through only one of the holes, respectively.

[0009] When performing refractive tests using the apparatus and method described in Patent Document 1, it is desirable to minimize workload and achieve efficient examination. Specifically, when performing refractive tests on both eyes, it is desirable to be able to quickly switch between the eyes being examined without having to change the measuring disc equipped with (two) holes for each eye. Furthermore, when examining one eye, it is necessary to prevent excess light from entering the other eye, and it is desirable to make the shielding structure and operation of the eye on the unexamined side as simple as possible. To obtain accurate prescription values, it is necessary to examine the refractive properties of the eye in multiple directions, and it is desirable to be able to easily and reliably change the orientation of the holes in the measuring disc (hole arrangement direction) to multiple directions. Summary of the Invention

[0010] To address the aforementioned problems, the illustrated embodiments of the present invention provide a refractive measurement device that can easily and cost-effectively perform high-precision eye refractive tests.

[0011] In one embodiment, a refractive measurement device is provided that measures the refractive properties of the eye based on corresponding images formed by a first light beam and a second light beam emitted from a light emitter. The first light beam and the second light beam pass through a first aperture and a second aperture, respectively, and are simultaneously incident on the eye. The first aperture and the second aperture are located at the same distance from the light emitter. The refractive measurement device includes, at corresponding positions corresponding to a pair of eyes: a first rotating member rotatably supported on a support member about a first rotation center, with the first aperture and the second aperture located on either side of the first rotation center; and a second rotating member rotatably supported at a position different from the first rotation center about a second rotation center, with at least one light-transmitting portion and a light-blocking portion located at different positions in the rotational direction about the second rotation center. When the first rotating member rotates relative to the supporting member, the second rotating member rotates along with the first rotating member, and at the same time, the hole arrangement direction of the first hole and the second hole changes with the rotation of the second rotating member. The refractive measuring device enters one of the light-transmitting state and the light-blocking state. In the light-transmitting state, the light-transmitting part coincides with the first hole and the second hole to allow the first beam and the second beam to pass through the first hole and the second hole, and in the light-blocking state, the light-blocking part coincides with the first hole and the second hole to block the first beam and the second beam.

[0012] Ideally, the refractive measuring device would also be equipped with a gear mechanism for rotating the second rotating member around the second rotation center by a rotation angle different from the unit rotation angle of the first rotating member around the first rotation center.

[0013] As an example of a gear mechanism, an annular internal gear centered at a first rotation center can be fixedly mounted on a support member. A second rotating member is rotatably supported on the first rotating member about a second rotation center. The second rotating member is equipped with external teeth that mesh with the internal teeth, and when the first rotating member rotates, the second rotating member rotates while simultaneously changing the meshing position of the internal and external teeth.

[0014] As another example of a gear mechanism, the second rotating member can be rotatably supported on a support member about a second rotation center, and the first and second rotating members can each be equipped with external teeth, each external tooth having a different number of teeth. The drive gear is also configured to mesh with the external teeth of the first and second rotating members, and when the drive gear rotates, the rotation of the first and second rotating members simultaneously changes the meshing position between the drive gear and the corresponding external teeth of the first and second rotating members.

[0015] As an example of a light-transmitting portion, the light-transmitting portion may include multiple openings formed through the second rotating member at different positions in the rotational direction about the second rotation center. In the light-transmitting state, the first hole and the second hole coincide with each corresponding opening of the multiple openings and are oriented in the multiple hole arrangement direction about the first rotation center, thereby allowing the first beam and the second beam to pass through the first hole and the second hole.

[0016] Ideally, the four openings are provided in the second rotating member, wherein for every 45 degrees of rotation of the first rotating member, the first hole and the second hole coincide with each corresponding opening of the four openings.

[0017] As an example of a light-transmitting portion, the light-transmitting portion may include a series of openings continuously formed in the rotational direction about a second rotation center. In the light-transmitting state, the first and second openings allow the first and second light beams to pass through them, while the arrangement direction of the openings continuously changes within the range defined by the continuous openings.

[0018] In another embodiment, a refractive measurement device is provided that measures the refractive properties of the eye based on corresponding images formed by a first beam and a second beam emitted from a light emitter, the first beam and the second beam passing through a first aperture and a second aperture respectively and simultaneously incident on the eye, the first aperture and the second aperture being disposed at the same distance from the light emitter. The refractive measurement device includes: rotating members rotatably supported at positions corresponding to a pair of eyes. Each rotating member is provided with a plurality of groups of first apertures and second apertures and a light-blocking portion at a corresponding position eccentrically positioned with respect to the rotation center of the associated rotating member. When the arrangement direction of the corresponding apertures of the plurality of groups of first apertures and second apertures changes according to a change in the angular position of the associated rotating member in the rotation direction, the refractive measurement device enters one of a light-transmitting state and a light-blocking state. In the light-transmitting state, the first beam and the second beam pass through a group of first apertures and second apertures one at a time on either side of the visual axis, and in the light-blocking state, the light-blocking portion blocks the first beam and the second beam from the field of view.

[0019] Therefore, the rotation of the rotating component determines the light transmission state in which the refractive properties of the eye are measured in multiple orientations, and the light blocking state in which the first and second beams used for measurement are blocked. Thus, a refractive measurement device can be easily implemented at low cost, and high-precision eye refractive testing can be performed with excellent operability and less time and effort.

[0020] This disclosure relates to the subject matter of Japanese Patent Application No. 2020-161774 (filed on September 28, 2020), the entire contents of which are expressly incorporated herein by reference. Attached Figure Description

[0021] Embodiments and examples of the invention will be discussed in detail with reference to the accompanying drawings, in which:

[0022] Figure 1 This is an illustrative diagram illustrating the measurement of the refractive properties of the eye using a refractive measurement device according to an embodiment of the present invention;

[0023] Figure 2 It is by Figure 1 A schematic diagram of the visual marker image formed by the refractive measurement device;

[0024] Figure 3 It is by Figure 1 A schematic diagram of the visual marker image formed by the refractive measurement device;

[0025] Figure 4 It is by Figure 1 A schematic diagram of the visual marker image formed by the refractive measurement device;

[0026] Figure 5 This is a front view of the measuring fixture of the refraction measuring device constituting an embodiment of the present invention;

[0027] Figure 6 The internal structure of the disk unit in the first embodiment at a first angular position is shown;

[0028] Figure 7 The internal structure of the disk unit in the first embodiment at a second angular position is shown;

[0029] Figure 8 The internal structure of the disk unit in the first embodiment at the third angular position is shown;

[0030] Figure 9 The internal structure of the disk unit in the first embodiment at the fourth angular position is shown;

[0031] Figure 10 The internal structure of the disk unit in the first embodiment at the fifth angular position is shown;

[0032] Figure 11 A modified embodiment of the disk unit of the first embodiment is shown;

[0033] Figure 12 Another modified embodiment of the disk unit of the first embodiment is shown;

[0034] Figure 13 Another modified embodiment of the disk unit of the first embodiment is shown;

[0035] Figure 14 Another modified embodiment of the disk unit of the first embodiment is shown;

[0036] Figure 15 Another modified embodiment of the disk unit of the first embodiment is shown;

[0037] Figure 16 This is a front view of the disk unit in the second embodiment;

[0038] Figure 17 This is a rear view of the disk unit in the second embodiment;

[0039] Figure 18 The third embodiment shows the measuring disk in the first angular position;

[0040] Figure 19 The third embodiment shows the measuring disk in the second angular position;

[0041] Figure 20 The third embodiment shows the measuring disk in the third angular position;

[0042] Figure 21 The third embodiment shows the measuring disk in the fourth angular position; and

[0043] Figure 22 The third embodiment shows the measuring disk in the fifth angular position. Detailed Implementation

[0044] First, refer to Figures 1 to 4 This description provides an overview of eye refraction testing (measurement of refractive properties) using the refractive measuring apparatus of this disclosure. This measurement of the eye's refractive properties utilizes the Scheiner principle, in which a beam of light passing through two separate apertures is refracted at a lens element, intersects (meets) at the focal point to become a single beam, and then splits back into two beams at a location away from the focal point.

[0045] The flat measuring disk 10 is equipped with a first hole 11 and a second hole 12. The first hole 11 and the second hole 12 are pinhole-shaped circular holes formed through the measuring disk 10. The first hole 11 and the second hole 12 have the same dimensions (diameter). Furthermore, the dimensions between the central axes of the first hole 11 and the second hole 12 and their mutual distance are determined to reflect the Scheiner principle. The direction in which the first hole 11 and the second hole 12 are arranged (the direction of the line connecting the corresponding centers of the first hole 11 and the second hole 12) is defined as the hole arrangement direction. It should be noted that the first hole 11 and the second hole 12 can be slit-shaped holes; in such cases, the two slits are arranged parallel to each other.

[0046] A light-emitting device (light emitter) 13 is provided, which emits a first light beam L1 and a second light beam L2 towards the measuring disk 10 at the same distance from the light-emitting device 13. The light-emitting device 13 is equipped with two rectangular visual markers 14 and 15 on its emitting surface; the first light beam L1 is emitted from the visual marker 14, and the second light beam L2 is emitted from the visual marker 15. The relative positions of the visual markers 14 and 15 can be changed along the hole arrangement direction of the measuring disk 10 in the light-emitting device 13. Furthermore, the angular positions of the visual markers 14 and 15 can be changed about an axis perpendicular to the emitting surface of the light-emitting device 13 (the axis passing through the boundary between the visual markers 14 and 15). A radial indicator is formed around the visual markers 14 and 15, which guides the angular positions of the visual markers 14 and 15.

[0047] The light dispersion of the self-emissive device 13 can be selected from various configurations. For example, visual markers 14 and 15 can be formed as light-splitting shields, separating the light emitted from the light source by partially allowing light to pass through the shields. Alternatively, a surface light source (display) can be used to emit the light areas forming visual markers 14 and 15. Alternatively, visual markers 14 and 15 can be configured as light-reflecting portions, whereby the reflected light reflected by visual markers 14 and 15 is dispersed into a first beam L1 and a second beam L2.

[0048] By using optical elements such as filters, the first beam L1 is prevented from passing through the second aperture 12 and the second beam L2 is prevented from passing through the first aperture 11, allowing the light-emitting device 13 to have selective transmission properties. For example, the first beam L1 and the second beam L2 can be provided with different wavelength bands. Then, a color filter is provided on the first aperture 11, whose wavelength band allows the first beam L1 to pass through its transmission while blocking the second beam L2 from passing through its transmission. A color filter is provided on the second aperture 12, whose wavelength band allows the second beam L2 to pass through its transmission while blocking the first beam L1 from passing through its transmission. Alternatively, if the first beam L1 and the second beam L2 are linearly polarized with different polarization properties, a polarizing filter is provided on the first aperture 11, which is arranged in a direction that allows the first beam L1 to pass through its transmission while blocking the second beam L2 from passing through its transmission. Another polarizing filter is provided on the second aperture 12, which is arranged in a direction that allows the second beam L2 to pass through its transmission while blocking the first beam L1 from passing through its transmission.

[0049] The measuring disc 10 is positioned between the light-emitting device 13 and the subject's eye, such that the visual axis Q of the subject's eye travels along the intermediate axis between the first aperture 11 and the second aperture 12. The measuring disc 10 narrows (restricts) the first beam L1 and the second beam L2 (emitted from the light-emitting device 13) through the first aperture 11 and the second aperture 12, respectively, while allowing both beams to pass through and reach the retina of the eye. Due to the selective transmission properties of the first aperture 11 and the second aperture 12, the first beam L1 reaches the retina of the eye only through the first aperture 11, and the second beam L2 reaches the retina of the eye only through the second aperture 12. Therefore, the subject perceives the image of the first beam L1 as the visual marker image 14M corresponding to the visual marker 14, and the image of the second beam L2 as the visual marker image 15M corresponding to the visual marker 15.

[0050] If the refractive properties of the eye are normal, i.e., appropriate and correct, the positions reached by the first beam L1 through the first aperture 11 and the positions reached by the second beam L2 through the second aperture 11 will meet (align) with the arrangement direction of the first aperture 11 and the second aperture 12. In this case, the images formed by the first beam L1 and the images formed by the second beam L2 appear to the subject to be aligned (overlapped) with respect to the arrangement direction of the first aperture 11 and the second aperture 12. In other words, when the rectangular visual markers 14 and 15 are arranged linearly on the light-emitting device 13, the corresponding rectangular visual marker images 14M and 15M are presented in a linear arrangement, as shown below. Figure 2 As shown.

[0051] However, if the refractive power of the eye is greater than that of a normal eye, the first beam L1 and the second beam L2 intersect before reaching the retina. Conversely, if the refractive power of the eye is less than that of a normal eye, the first beam L1 and the second beam L2 neither intersect with the retina nor intersect before reaching the retina (i.e., the intersection of the first beam L1 and the second beam L2 is behind the retina); therefore, in either case, the image formed by the first beam L1 and the second beam L2 will be presented to the subject when it is offset in the arrangement direction of the first aperture 11 and the second aperture 12. In other words, when the rectangular visual markers 14 and 15 are arranged linearly on the light-emitting device 13, the corresponding rectangular visual marker images 14M and 15M are misaligned relative to the linear arrangement. Figure 3 The presentation of visual marker images 14M and 15M is shown when the refractive power of the eye is greater than that of a normal eye. Figure 4 The presentation of visual marker images 14M and 15M is shown when the refractive power of the eye is less than that of a normal eye.

[0052] Therefore, information about the refractive properties of the eye can be obtained based on the presentation of the image formed by the first beam L1 (visual marker image 14M) and the image formed by the second beam L2 (visual marker image 15M). However, it is difficult to deduce the refractive properties by quantitatively identifying the deviation between the two images on the subject's side. Therefore, the positional relationship of visual markers 14 and 15 is changed (adjusted) at the light-emitting device 13 along the arrangement direction between the first aperture 11 and the second aperture 12, thereby establishing an alignment state (linear arrangement), in which the image formed by the first beam L1 and the image formed by the second beam L2 are presented aligned with respect to the arrangement direction of the first aperture 11 and the second aperture 12 (visual marker images 14M and 15M are presented superimposed on each other in a linear arrangement), thereby allowing the eye's refractive power to be calculated based on the positional relationship (offset and offset direction) of visual markers 14 and 15 in such an alignment state.

[0053] The technique for changing the position of visual markers 14 and 15 along the hole arrangement direction varies depending on the configuration / structure of the light-emitting device 13. For example, if visual markers 14 and 15 are formed as shielding elements or light-reflecting portions, these portions can be mechanically moved using an actuator. If visual markers 14 and 15 are configured as portions of a light-emitting display, the light-emitting area of ​​the display is changed.

[0054] The processor 16, which constitutes part of the refractive measurement device, is equipped in the form of a computer or the like, and controls the position changes of visual markers 14 and 15 in the aperture arrangement direction. For example, the positions of visual markers 14 and 15 can be changed based on input operations by the subject or the person performing the measurement (e.g., an optometrist) using an input device such as a keyboard or touch panel. Furthermore, the processor 16 obtains distance information between the measuring disk 10 and the light-emitting surfaces (on the light-emitting device 13) of the first beam L1 and the second beam L2 from a distance sensor. Furthermore, the processor 16 calculates the refractive power of the eye based on the positional offset of visual markers 14 and 15 along the aperture arrangement direction when the first beam L1 and the second beam L2 (visual marker images 14M and 15M) are in the aforementioned aligned state on the retina. The formula disclosed in Patent Document 1 (Japanese Unexamined Patent Publication No. 2020-103743) can be used to calculate the refractive power of the eye.

[0055] By using the aforementioned refractive measurement device, the eye's refractive power can be measured very accurately simply by having the subject identify the alignment of visual marker images 14M and 15M. Because the light-emitting device 13 does not require complex light-emitting control, nor does it require the subject or the person performing the measurement (optometrist, etc.) to record the offset of visual marker images 14M and 15M, the construction and control of the refractive measurement device can be simplified, and the workload of the measurement operation can be reduced.

[0056] Furthermore, because the first beam L1 does not pass through the second aperture 12 and the second beam L2 does not pass through the first aperture 11, only two images are formed simultaneously on the retina: visual marker image 14M and visual marker image 15M. Therefore, the subject can easily and accurately determine whether there is any positional shift between visual marker image 14M and visual marker image 15M.

[0057] With such selective light transmission properties provided for the first aperture 11 and the second aperture 12, by using the aforementioned color filter, the subject can more easily identify the positional relationship between the visual marker image 14M and the visual marker image 15M because the colors of the first beam L1 and the second beam L2 are different.

[0058] Because the refractive properties of the eye depend on the orientation, in practice, actual refractive tests require measurements of these properties in multiple directions. Specifically, it is desirable to arrange the first aperture 11 and the second aperture 12 in three or more directions away from the horizontal direction, the vertical direction, and the intermediate direction between the horizontal and vertical directions, and to perform measurements in each of these directions.

[0059] To achieve such multi-directional measurements, it is conceivable to provide multiple measuring discs 10, wherein the first hole 11 and the second hole 12 have different hole arrangement orientations, and each measuring disc 10 is replaced and set in front of the subject's eyes when a measurement is performed in each direction. However, preparing, storing, and replacing multiple measuring discs 10 is a cumbersome operation and is therefore undesirable. Furthermore, refraction testing is performed on one eye at a time; however, it is required that the switching operation between the eyes being tested be effortless. Specifically, it is required that the measuring discs 10 for the left and right eyes not be replaced, that the untested eye be easily shielded, and that measurements in multiple orientations be easily performed with high accuracy. The measuring fixture of the refraction measuring device for solving the above problems will be described in detail below.

[0060] Figure 5The measuring fixture 20 shown is equipped with a retainer member 21 and two disc units 22 and 23. The retainer member 21 has a structure similar to an eyeglass frame. According to the first embodiment, the two disc units 22 and 23 are attached to (mounted) to the retainer member 21. The retainer member 21 is a support member that directly or indirectly supports the components forming the respective structures of the disc units 22 and 23. Disc unit 22 is used to test the right eye, and disc unit 23 is used to test the left eye. Disc units 22 and 23 have the same structure (specifications), and the common portion between disc units 22 and 23 will be described only once. It should be noted that although... Figure 5 The cover 24 attached to disk unit 22 and the cover 24 not attached to disk unit 23 are shown. When the measuring fixture 20 is actually used, the cover 24 is attached to both disk unit 22 and disk unit 23.

[0061] The retainer member 21 is equipped with a pair of annular rims 25, which respectively support disc unit 22 and disc unit 23 and are spaced apart from each other in the left-right direction. The pair of annular rims 25 are connected to each other by a bridging member 26. Although details are omitted in this disclosure, an eye width adjustment mechanism for adjusting the distance between the pair of annular rims 25 is provided on the bridging member 26, and disc unit 22 and disc unit 23 can be appropriately (correctly) adjusted in front of the subject's right and left eyes, respectively. Furthermore, a strap is provided to attach the retainer member 21 to the subject's head and face while adjusting the position of the retainer member 21 relative to it.

[0062] The following will refer to Figures 6 to 10 Describe details regarding disk unit 22 and disk unit 23. From... Figure 6 In each of the initial diagrams, the X direction refers to the horizontal direction, and the Y direction refers to the vertical direction. The measuring disc 30 is... Figure 1 The measuring disk 30 is a circular plate-shaped component corresponding to the measuring disk 10 of the refractive measuring device, and constitutes the first rotating component of the disk unit 22 (23). The measuring disk 30 is rotatable about the first rotation center P1 and is supported on the front surface of the annular rim 25 (of the pair of annular rims 25).

[0063] Furthermore, the internal gear component (ring gear) 35 is fixedly supported on the front side of the ring rim 25. The internal gear component 35 is equipped with internal teeth 36 along the inner circumference of a cylindrical component centered on the first rotation center P1. The internal teeth 36 have a ring shape centered on the first rotation center P1. The measuring disk 30 is positioned between the ring rim 25 and the internal gear component 35 relative to the forward / backward direction.

[0064] Structures for rotatably supporting the measuring disk 30 can be provided in various forms. For example, an annular space can be provided between the annular rim 25 and the internal gear member 35, and a cylindrical guide surface, which is the inner circumferential surface of a cylindrical tube centered at a first rotation center P1, can define the outer circumferential portion of the annular space. The measuring disk 30 can be rotatably supported by sliding contact between the outer circumferential portion of the measuring disk 30 and such a cylindrical guide surface.

[0065] As another example, an annular guide groove centered on a first rotation center P1 and opening in the forward / backward direction can be formed in the front surface of the annular rim 25 or in the rear surface of the internal gear member 35, and the measuring disk 30 is rotatably supported by inserting a protrusion formed on the measuring disk 30 into the annular guide groove.

[0066] In any of the above-described example structures for rotatably supporting the measuring disk 30, the forward and backward movement of the measuring disk 30 is restricted because it is sandwiched between the annular rim 25 and the internal gear member 35, allowing the measuring disk 30 to rotate stably. Furthermore, since the first light beam L1 and the second light beam L2 used for measurement pass near the center of the measuring disk 30 where the first rotation center P1 is located, the mechanism for rotatably supporting the measuring disk 30 is preferably located at the circumferential edge of the measuring disk 30, rather than near the center of the measuring disk 30 in the radial direction, so as not to obstruct (block) the first light beam L1 and the second light beam L2.

[0067] The measuring disk 30 is equipped with a first hole 31 and a second hole 32, which are formed at symmetrical positions on either side of the first rotation center P1. The first hole 31 and the second hole 32 are... Figure 1 The first hole 11 and the second hole 12 are corresponding to pinhole-shaped circular holes. The hole arrangement direction of the measuring disk 30 is defined by a straight line extending through the center of the first hole 31 and the second hole 32 and through the first rotation center P1. Furthermore, as the measuring disk 30 is rotating, the angle of the hole arrangement direction centered on the first rotation center P1 changes accordingly.

[0068] The shielding control plate 40 of the second rotating member in the forming disc unit 22 (23) is provided on the front side of the measuring disc 30. The diameter of the shielding control plate 40 is smaller than the diameter of the measuring disc 30, and the shielding control plate 40 is an external gear member with external teeth 41 that mesh with the internal teeth 36 on its outer periphery.

[0069] The shielding control plate 40 is rotatably supported about a second rotation center P2, which is eccentrically positioned relative to the first rotation center P1 of the measuring disk 30. The second rotation center P2 is located on a straight line extending orthogonally to the hole arrangement direction through the first rotation center P1. Specifically, a cylindrical shaft 37 protruding forward from the measuring disk 30 is inserted into a circular shaft hole 42 provided in the shielding control plate 40, and the shielding control plate 40 rotates relative to the measuring disk 30 due to the sliding contact between the inner circumferential surface of the shaft hole 42 and the outer circumferential surface of the cylindrical shaft 37. Furthermore, the center positions of the cylindrical shaft 37 and the shaft hole 42 are the same as those of the second rotation center P2.

[0070] The internal teeth 36 of the internal gear member 35 and the external teeth 41 of the shielding control plate 40 constitute a gear mechanism for rotating the shielding control plate 40 in association with the measuring disk 30, wherein the shielding control plate 40 rotates about a second rotation center P2 at a rotation angle different from the unit rotation angle of the measuring disk 30 rotating about a first rotation center P1. The number of teeth of the internal teeth 36 on the internal gear member 35 is greater than the number of teeth of the external teeth 41 of the shielding control plate 40, and their ratio is determined to be 8:5. In this aspect of the present disclosure, the internal teeth 36 are equipped with sixty-four (64) teeth and the external teeth 41 are equipped with forty (40) teeth; however, these figures are merely examples and may have different numbers of teeth.

[0071] The shielding control plate 40 is equipped with four openings 43, 44, 45, and 46, which are formed at different positions in the rotational direction about the second rotation center P2. Furthermore, the region (segment) of the shielding control plate 40 in the rotational direction between openings 43 and 46 defines a closed portion 47 that prevents light from passing through (no opening). Openings 43, 44, 45, and 46 define the light-transmitting portion of the shielding control plate 40, and the closed portion 47 defines the light-blocking portion of the shielding control plate 40.

[0072] Each of the four openings 43, 44, 45, and 46 is an arcuate slot extending longitudinally in the direction of rotation about the second rotation center P2. The center positions of the four openings 43, 44, 45, and 46 relative to their longitudinal directions are located at an angle of 72 degrees in the direction of rotation about the second rotation center P2. Furthermore, the position of the closed portion 47 is offset by 72 degrees from the corresponding center positions of the openings 43 and 46 relative to their longitudinal directions in both the forward and reverse rotation directions. Therefore, the five elements—the four openings 43, 44, 45, and 46 and the closed portion 47—are arranged around the second rotation center P2 in five equal regions (72-degree regions) with a rotation angle of 360 degrees.

[0073] Five angular position indicators 50, 51, 52, 53, and 54 are formed at different positions on the front surfaces of the annular rim 25 and the internal gear member 35 in the direction of rotation of the measuring disk 30 about the first rotation center P1. Angular position indicators 50, 51, 52, and 53 are equipped with corresponding combinations of linear markings and circled numbers from "1" to "4," the linear markings being positioned on the front surface of the internal gear member 35 and extending radially about the first rotation center P1, and the circled numbers from "1" to "4" being positioned on the front surface of the annular rim 25. The remaining angular position indicator 54 is equipped with a combination of a circular marking and the circled number "5," the circular marking being positioned on the front surface of the internal gear member 35, and the circled number "5" being positioned on the front surface of the annular rim 25.

[0074] Five angular position indicators 50, 51, 52, 53, and 54 are arranged at equal angular intervals of 45 degrees in the direction of rotation about the first rotation center P1. In other words, the five angular position indicators 50, 51, 52, 53, and 54 are arranged at four equally spaced positions within a 180-degree rotation angle of the measuring disk 30 about the first rotation center P1. Circular and linear marks on the front surface of the internal gear member 35 serve as positional references for the angular position indicators 50, 51, 52, 53, and 54 in the direction of rotation. In other words, if the circled numbers "1" to "5" are within a range that allows identification of their correspondence with the circular and linear marks, the positions of the circled numbers "1" to "5" located on the front surface of the annular rim 25 may be slightly offset and misaligned in the direction of rotation.

[0075] Cover 24 covering the front of the measuring disc 30 and the shielding control plate 40 (reference) Figure 5 The covers 24 are attached to disk units 22 and 23 respectively. Each cover 24 has a circular plate shape, and the outer diameter of each cover 24 is determined to be slightly larger than the inner diameter of the internal gear member 35. Therefore, when each cover 24 is attached, the internal teeth 36 and their internal area cannot be visually identified from the outside. The area on the front surface of the internal gear member 35, except for the internal teeth 36, is not covered by the covers 24 and is externally visible; the circular and linear markings of the angular position indicators 50, 51, 52, 53, and 54 are arranged on this externally visible area.

[0076] The measuring disk 30 is separately equipped with a cylindrical shaft 38 protruding in the forward direction from the cylindrical shaft 37 of the rotary support shielding control plate 40. The cylindrical shaft 38 is located on the opposite side of the first rotation center P1 relative to the radial direction of the measuring disk 30, opposite to the cylindrical shaft 37. The position of the cover 24 in the forward / rearward direction is determined by the cylindrical shaft 37 and the cylindrical shaft 38 abutting against the front end face of the cover 24.

[0077] The cover 24 is equipped with two through holes corresponding to the cylindrical shafts 37 and 38, respectively, and fastening members (e.g., fastening screws) 39 are inserted (or screwed) into the cylindrical shafts 37 and 38 through the two through holes. Internal threads are formed inside the cylindrical shafts 37 and 38, and external threads are formed on the outer surface of the fastening member 39. Thus, the cover 24 is fixed to the measuring disk 30 by engaging the internal and external threads and tightening the fastening member 39 with appropriate torque. In this tightened state, when a force in the rotational direction is applied to the cover 24 (during rotation operation), the cover 24 and the measuring disk 30 rotate as a whole about the first rotation center P1.

[0078] An exposure hole 55 is formed through the center of the cover 24. The exposure hole 55 is in the form of a slot, the longitudinal direction of which is in the hole arrangement direction of the measuring plate 30. The first hole 31 and the second hole 32 are exposed through the exposure hole 55 along the forward direction of the cover 24 (see...). Figure 5 Because the cover 24 and the measuring disk 30 are integral in the direction of rotation about the first rotation center P1, the first hole 31 and the second hole 32 are always exposed through the exposure hole 55, regardless of the angular position of the measuring disk 30 in the direction of rotation.

[0079] In addition, a mark 49 is formed on the cover 24. The mark 49 is an arrow-shaped (triangular) mark extending in the longitudinal direction of the exposure hole 55 and pointing in the direction of the outer diameter of the cover 24 (away from the exposure hole 55).

[0080] When the measuring clamp 20 is fitted onto the subject (and worn by the subject), the corresponding first rotation centers P1 (the center position between the first hole 31 and the second hole 32) of the left and right disc units 22 and 23 are set to the corresponding visual axes Q of the subject's left and right eyes. Figure 1 The position of the extension of the measuring disc 30 (aligned with this position). Thereafter, by performing the rotation operation of the cover 24 and the measuring disc 30 in the disc units 22 and 23, each disc unit having the above-described structure, the refractive properties of the eye can be measured in multiple orientations while simultaneously shielding the untested opposing eye (the other eye of the subject).

[0081] The following description will provide information on measuring the refractive properties of the eye using disk units 22 and 23. It should be noted that when the measurement direction is changed by altering the angular position of the measuring disk 30 in each of disk units 22 and 23, the angular positions of the visual markers 14 and 15 in the light-emitting device 13 (…) Figure 1 The corresponding changes ensure that the hole arrangement direction of the measuring disc 30 is always associated with the arrangement direction of the visual marks 14 and 15.

[0082] For example, if the subject or the person performing the measurement manually changes the angular position of the measuring disc 30 relative to the disc unit 22 (23), the changed angular position information is input to the processor 16 via an input device (such as a keyboard, touch panel, etc.). Figure 1 In this process, the processor 16 controls the light-emitting device 13 to change the angular position of the visual markers 14 and 15.

[0083] Alternatively, the observation device (e.g., a camera) can be equipped in a refractive measurement device, which can detect the orientation (direction) of the mark 49 by imaging (taking pictures) the disk unit 22 (23) and using image analysis techniques. Therefore, the processor 16 automatically controls the light-emitting device 13 to change the angular position of the visual mark 14 and the visual mark 15 based on the position of the cover 24 detected by the observation device.

[0084] Furthermore, by using such an observation device, the position of the measuring fixture 20 can be verified. For example, when examining the right eye, it can be detected that the disc unit 23 for the left eye is not in the light-blocking position (and vice versa). In such a case, the processor 16 can warn the subject or the person performing the measurement that an error has occurred.

[0085] Figure 6 This shows that disk unit 22 (and disk unit 23) are in ( Figure 5 The internal structure in one state (shown) is such that the end of the mark 49 on the cover 24 points to the first angular position of the angular position indicator 50. In this state, the central axis of the cylindrical shaft 37 (second rotation center P2), the central axis of the cylindrical shaft 38, and the first rotation center P1 are arranged in a straight line in the Y direction. In addition, the hole arrangement directions of the first hole 31 and the second hole 32 of the measuring disk 30 are aligned in the X direction. The shielding control plate 40 engages with the internal gear member 35 via the external teeth 41 and the internal teeth 36 at the lowest region of the internal gear member 35 relative to the Y direction, and in the front view, the first hole 31 and the second hole 32 are positioned within the opening 43 (coincident within the opening). In other words, the disk unit 22 (23) is located in the first beam L1 and the second beam L2 (refer to the second beam L2). Figure 1 It can pass through the first hole 31 and the second hole 32 via the opening 43.

[0086] Therefore, by setting disk unit 22 and disk unit 23 to Figure 6In the indicated state (first angular position), the first beam L1 and the second beam L2 can pass through the exposure hole 55 of the cover 24 and the opening 43 of the shielding control plate 40 to pass through the first hole 31 and the second hole 32. Subsequently, based on the images (visual marker images 14M and 15M) formed on the retina by the first beam L1 and the second beam L2 passing through the first hole 31 and the second hole 32 respectively, the refractive properties of the eye can be measured in the X-direction (horizontal direction) orientation, which corresponds to the aperture arrangement direction of the first hole 31 and the second hole 32. In this state, because the linear marker of the angular position indicator 50, pointed to by the marker 49, extends in the aperture arrangement direction, the orientation of the refractive measurement can be easily visually identified.

[0087] Figure 7 The internal structure of disk unit 22 (and disk unit 23) is shown with the end of mark 49 on cover 24 pointing to the second angular position indicating angular position indicator 51. Measuring disk 30 from... Figure 6 In the first angular position shown in the front view, rotate counterclockwise by 45 degrees around the first rotation center P1, so that the hole arrangement direction of the first hole 31 and the second hole 32 is tilted upward and to the right by 45 degrees relative to the X direction.

[0088] As the measuring disk 30 rotates around the first rotation center P1, the shielding control plate 40, supported by the measuring disk 30 via the cylindrical shaft 37 and the shaft hole 42, also rotates with the measuring disk 30 (moving in the direction of rotation around the first rotation center P1). Thus, the shielding control plate 40 rotates around the second rotation center P2 (planetary rotation), simultaneously changing the meshing position of the external teeth 41 (of the shielding control plate 40) relative to the internal teeth 36 (of the internal gear member 35). In this state, the measuring disk 30 advances counterclockwise around the first rotation center P1, while the shielding control plate 40 rotates clockwise around the second rotation center P2.

[0089] As a result of the operation of the shielding control plate 40 (a combination of a change in the position of the second rotation center P2 about the first rotation center P1 and a planetary rotation about the second rotation center P2), the opening 44 is positioned in front of the first opening 31 and the second opening 32, with its longitudinal direction tilted upward and to the right at a 45-degree angle relative to the X direction. In other words, in the front view, the first hole 31 and the second hole 32 are positioned within the opening 44, and the first beam L1 and the second beam L2 (refer to...) Figure 1 It can pass through the first hole 31 and the second hole 32 via the opening 44.

[0090] Therefore, by setting disk unit 22 and disk unit 23 to Figure 7In the indicated state (second angular position), the first beam L1 and the second beam L2 can pass through the exposure hole 55 of the cover 24 and the opening 44 of the shielding control plate 40 to pass through the first hole 31 and the second hole 32. Subsequently, based on the images (visual marker images 14M and 15M) formed on the retina by the first beam L1 and the second beam L2 passing through the first hole 31 and the second hole 32 respectively, the refractive properties of the eye can be measured at a first intermediate orientation between the X direction (horizontal direction) and the Y direction (vertical direction), which corresponds to the aperture arrangement direction of the first hole 31 and the second hole 32. In this state, because the linear marker of the angular position indicator 51, pointed to by the marker 49, extends in the aperture arrangement direction, the orientation of the refractive measurement can be easily visually identified.

[0091] Figure 8 The internal structure of disk unit 22 (and disk unit 23) is shown with the end of mark 49 on cover 24 pointing to the third angular position of the angular position indicator 52. Measuring disk 30 from... Figure 7 In the second angular position shown in the front view, rotate counterclockwise by 45 degrees around the first rotation center P1, so that the hole arrangement direction of the first hole 31 and the second hole 32 extends along the Y direction.

[0092] As the measuring disk 30 rotates from the second angle position to the third angle position, the shielding control plate 40 rotates around the second rotation center P2 (planetary rotation), while changing the meshing position of the external teeth 41 (of the shielding control plate 40) relative to the internal teeth 36 (of the internal gear component 35).

[0093] As a result of this operation of the shielding control plate 40, with the opening 45 extending longitudinally in the Y direction, the opening 45 is positioned in front of the first hole 31 and the second hole 32. In other words, the first hole 31 and the second hole 32 are positioned within the opening 45 in the front view, and the first beam L1 and the second beam L2 (see...) Figure 1 It can pass through the first hole 31 and the second hole 32 via the opening 45.

[0094] Therefore, by setting disk unit 22 and disk unit 23 to Figure 8In the shown state (third angular position), the first beam L1 and the second beam L2 can pass through the exposure hole 55 of the cover 24 and the opening 45 of the shielding control plate 40 to pass through the first hole 31 and the second hole 32. Subsequently, based on the images (visual marker images 14M and 15M) formed on the retina by the first beam L1 and the second beam L2 passing through the first hole 31 and the second hole 32 respectively, the refractive properties of the eye can be measured in the Y direction (vertical direction), which corresponds to the aperture arrangement direction of the first hole 31 and the second hole 32. In this state, because the linear marker of the angular position indicator 52, pointed to by the marker 49, extends in the aperture arrangement direction, the orientation of the refractive measurement can be easily visually identified.

[0095] Figure 9 The internal structure of disk unit 22 (and disk unit 23) is shown with the end of mark 49 on cover 24 pointing to the fourth angular position of the angular position indicator 53. Measuring disk 30 from... Figure 8 In the third angular position shown in the front view, rotate counterclockwise by 45 degrees around the first rotation center P1, such that the hole arrangement direction of the first hole 31 and the second hole 32 is tilted downward and to the right by 45 degrees relative to the X direction. This hole arrangement direction relative to... Figure 7 The hole arrangement direction at the second angular position shown is reversed from right to left, and relative to... Figure 6 The hole arrangement direction has changed by 135 degrees when the first angle position is set to 0 degrees.

[0096] As the measuring disc 30 rotates from the third angle position to the fourth angle position, the shielding control plate 40 rotates around the second rotation center P2 (planetary rotation), while changing the meshing position of the external teeth 41 (of the shielding control plate 40) relative to the internal teeth 36 (of the internal gear component 35).

[0097] As a result of this operation of the shielding control plate 40, with the longitudinal direction of the opening 46 tilted downwards and to the right at a 45-degree angle (135 degrees relative to the first angular position) relative to the X direction, the opening 46 is positioned in front of the first hole 31 and the second hole 32. In other words, the first hole 31 and the second hole 32 are positioned within the opening 46 in the front view, and the first beam L1 and the second beam L2 (refer to...) Figure 1 It can pass through the first hole 31 and the second hole 32 via the opening 46.

[0098] Therefore, by setting disk unit 22 and disk unit 23 to Figure 9In the shown state (fourth angular position), the first beam L1 and the second beam L2 can pass through the exposure hole 55 of the cover 24 and the opening 46 of the shielding control plate 40 to pass through the first hole 31 and the second hole 32. Subsequently, based on the images (visual marker images 14M and 15M) formed on the retina by the first beam L1 and the second beam L2 passing through the first hole 31 and the second hole 32 respectively, the refractive properties of the eye can be measured at a second intermediate orientation (135-degree orientation) between the X direction (horizontal direction) and the Y direction (vertical direction), which corresponds to the aperture arrangement direction of the first hole 31 and the second hole 32. In this state, because the linear marker of the angular position indicator 53, pointed to by the marker 49, extends in the aperture arrangement direction, the orientation of the refractive measurement can be easily visually identified.

[0099] Figure 10 The internal structure of disk unit 22 (and disk unit 23) is shown with the end of mark 49 on cover 24 pointing to the fifth angular position of the angular position indicator 54. Measuring disk 30 from... Figure 9 In the fourth angular position shown in the front view, rotate counterclockwise by 45 degrees around the first rotation center P1, such that the hole arrangement direction of the first hole 31 and the second hole 32 extends in the X direction. In this state, the positional relationship between the first hole 31 and the second hole 32 relative to the first hole 31 and the second hole 32 is... Figure 6 The positional relationships in the first angular position shown are reversed from right to left.

[0100] As the measuring disc 30 rotates from the fourth angle position to the fifth angle position, the shielding control plate 40 rotates around the second rotation center P2 (planetary rotation), while changing the meshing position of the external teeth 41 (of the shielding control plate 40) relative to the internal teeth 36 (of the internal gear component 35).

[0101] As a result of this operation of the shielding control panel 40, the closed portion 47 is positioned in front of the first aperture 31 and the second aperture 32, such that the first beam L1 and the second beam L2 emitted to the first aperture 31 and the second aperture 32 (see also...) Figure 1 It is shielded by the closed part 47.

[0102] Therefore, by setting disk unit 22 and disk unit 23 as Figure 10 In the state shown (fifth angular position), the first aperture 31 and the first aperture 32 are blocked by the closed portion 47 of the shielding control plate 40, preventing the first beam L1 and the second beam L2 from passing through the shielding control plate 40. In this state, because the angular position indicator 54 pointed to by the mark 49 is a circular mark, unlike the other angular position indicators 50, 51, 52, and 53, the state (shading state) where the measurement of the refractive properties of the eye was not performed at the specified orientation can be easily identified visually.

[0103] As described above, in disc unit 22 and disc unit 23, the orientation for measuring the refractive properties of the eye can be changed (switched) between multiple orientations, and by operating the cover 24 to select the desired angle position from the first angle position to the fifth angle position, the first hole 31 and the second hole 32 (from the light-transmitting state) can be switched to the light-blocking state.

[0104] As a specific example of using the measuring clamp 20, the cover 24 and the measuring disk 30 can be positioned at the fifth angle in the disk unit 23 for the left eye. Figure 10 ), and the cover 24 and the measuring disc 30 can be positioned from the first angular position in the disc unit 22 for the right eye ( Figure 6 The refractive properties of the right eye are measured at each orientation by sequentially changing to the fourth angular position. By positioning the cover 24 and the measuring disk 30 at the fifth angular position in the disk unit 23 for the left eye, unwanted light can be prevented from entering the left eye during the right eye refractive test.

[0105] When completing the refraction test for the right eye, the cover 24 and the measuring disc 30 are positioned at the fifth angle in the disc unit 22 for the right eye. Figure 10 Subsequently, the cover 24 and the measuring disc 30 are positioned from the first angular position in the disc unit 23 for the left eye. Figure 6 ) and change to the fourth angle position in sequence. Figure 9 This allows for the measurement of the refractive properties of the left eye in each orientation. By positioning the cover 24 and the measuring disk 30 at the fifth angular position within the disk unit 22 for the right eye, unwanted light can be prevented from entering the right eye during left-eye refractive testing.

[0106] In the aforementioned measuring fixture 20, a disc unit 22 for the right eye and a disc unit for the left eye are provided for use. Since no parts need to be replaced or replaced when switching from one eye to the other for testing, there is no need to perform operations involving the removal and attachment (replacement / replacement) of parts. Furthermore, in each of the disc units 22 and 23, since all operations for selecting the orientation for setting the shading state and measuring refractive properties can be performed solely through the overall rotation operation of the cover 24 and the measuring disc 30 (for selecting the angular position), the operability of the measuring fixture 20 is more advantageous compared to devices requiring multiple different operations. Because the angular position of the measuring disc 30 is distinguished by the positional relationship between the reference mark 49 and the angular position indicators 50, 51, 52, 53, and 54, the measuring disc 30 can be set to the appropriate angular position for high-precision inspection.

[0107] In disc units 22 and 23, high-precision inspection can be performed because the refractive properties of each eye can be measured in four orientations: the horizontal direction (X-direction), the vertical direction (Y-direction), and the two intermediate directions in between (45-degree and 135-degree directions). Furthermore, the ratio of the number of teeth on the internal gear member 35 to the number of teeth on the external gear 41 of the shielding control plate 40 is set to 8:5 to achieve light transmission states at four different orientations (directions), as well as light shielding states at angular positions different from these four orientations.

[0108] Furthermore, in disc units 22 and 23, the cover 24 and gear mechanism (internal gear member 35) associated with the rotary drive and support of the measuring disc 30 and the shielding control plate 40 are arranged such that these components are housed within the annular rim 25 of the retaining member 21 in the front view. Therefore, the measuring fixture 20 can achieve a compact structure.

[0109] Furthermore, by using disc units 22 and 23, which have the same structure, for the right and left eyes respectively, the number of parts can be reduced, thereby lowering manufacturing costs.

[0110] It should be noted that various types of devices can be used to apply rotational force to the measuring disc 30 and the shielding control plate 40. The above embodiment assumes manual operation by the subject or the person performing the measurement, such that force is transmitted to the measuring disc 30 and the shielding control plate 40 based on an external (manual) force applied to the rotatable cover 24. The advantage of such an embodiment is that it does not require a drive source and enables a simple power transmission structure. Furthermore, because the cover 24, which covers the internal structure of the disc unit 22 and the disc unit 23, also functions as an input member for rotational operation, the component structure for performing the rotational operation can be simplified.

[0111] However, a rotary drive device 27 with a drive source such as a motor can be used. Figure 6 The measuring disk 30 is rotated. As described above, in each disk unit 22 and 23, since all operations of setting the shielding state and selecting the measurement orientation can be performed simply by rotating the measuring disk 30 (integrally with the cover 24), a simple and low-cost rotary drive device 27 can be used.

[0112] In addition, when the measuring disc 30 is rotated manually, an externally operable lever can be provided and attached to the measuring disc 30, which can expose a portion of the outer periphery of the measuring disc 30 to facilitate external operation of the measuring disc, or the measuring disc 30 can be rotated by operating on a portion other than the cover 24.

[0113] Furthermore, the measuring disc 30 can be equipped with a structure that stops (holds) at multiple angular positions in the rotational direction. For example, a click mechanism can be provided between the holding member 21 and the measuring disc 30, and the rotation of the measuring disc 30 can be mechanically and gently engaged (with tactile feedback) at each of the aforementioned first to fifth angular positions. When a force exceeding a certain amount is applied in the rotational direction, the engagement state of the click mechanism is released, allowing the measuring disc 30 to rotate and reach the subsequent angular position. Providing such a click mechanism enables accurate and easy setting of the measurement orientation or shielding state, thereby improving the operability and accuracy of the inspection (refractive test).

[0114] In addition, in order to prevent the measuring disk 30 from shifting in the direction of rotation and to optimize the rotational operating force, a friction device or the like can be provided between the retaining member 21 and the measuring disk 30 to apply a predetermined rotational load on the measuring disk 30.

[0115] It should be noted that if the rotation angle of the measuring disk 30 in the same direction is greater than 360 degrees, the positional relationship between the first hole 31 and the second hole 32 of the measuring disk 30 and the openings 43, 44, 45, 46 and the closed portion 47 of the shielding control plate 40, from the first angular position to the fifth angular position starting from the second (360-degree) rotation, will no longer be satisfied. Figures 6 to 10 The indicated positional relationship. Therefore, the stop mechanism can be configured to limit the maximum rotation angle to 360 degrees or less. Furthermore, as... Figures 6 to 10 As shown, since the total rotation angle of the measuring disk 30 from the first angular position to the fifth angular position is 180 degrees, the stop mechanism can limit the maximum rotation of the measuring disk 30 to 180 degrees.

[0116] Figures 11 to 15 A modified embodiment of the shielding control panel 40, constituting part of the disk unit 22 (23) of the first embodiment, is shown, having a different configuration of light-transmitting portions. In each of these modified embodiments, repeated descriptions of parts and components with the same structure and labeled with the same reference figures have been omitted.

[0117] exist Figure 11 In the modified embodiment shown, each of the four openings (light-transmitting portions) 56, 57, 58, and 59 formed in the shielding control plate 40 is not an arcuate slot centered on the second rotation center P2, but a straight slot. Furthermore, each of the openings 56, 57, 58, and 59 extends along a tangential direction that is tangent to an imaginary circle centered on the second rotation center P2.

[0118] At the aforementioned first angular position of the measuring disc 30 ( Figure 11As shown in the diagram, opening 56 coincides with the first hole 31 and the second hole 32 (so that the first hole 31 and the second hole 32 coincide within opening 56). Similarly, openings 57 to 59 coincide with the first hole and the second hole 31 and 32 at the corresponding second to fourth angular positions of the measuring disk 30. Figures 6 to 9 Therefore, at each of these four angular positions, the first beam L1 and the second beam L2 (reference) Figure 1 The first hole 31 and the second hole 32 allow for the measurement of the refractive properties of the eye at each orientation. Furthermore, at the aforementioned fifth angular position of the measuring disc 30 ( Figure 10 The closed portion 47, located between openings 56 and 59, coincides with the first hole 31 and the second hole 32, and blocks the transmission of the first beam L1 and the second beam L2.

[0119] exist Figure 12 In the modified embodiment shown, the light-transmitting portion is formed by a continuous opening 60 that is continuous in the rotational direction about the second rotation center P2. For example, by connecting the longitudinal ends corresponding to the ends of the openings 43 to 46 in the first embodiment to each other, a long arc-shaped continuous opening 60 can be formed without being segmented (discontinuous) in the rotational direction.

[0120] exist Figure 13 In the modified embodiment shown, the light-transmitting portion is formed by four openings 61, 62, 63, and 64 formed in the shielding control plate 40, such that each of these openings extends radially from the second rotation center P2 in its longitudinal direction. The longitudinal direction of each of the four openings 61, 62, 63, and 64 extends in the hole arrangement direction at the aforementioned first to fourth angular positions to coincide with the first hole 31 and the second hole 32, and functions in the same manner as the aforementioned openings 43, 44, 45, and 46.

[0121] exist Figure 11 In the configuration shown, the second rotation center P2 is located on a straight line orthogonal to the hole arrangement direction of the first hole 31 and the second hole 32. Correspondingly, the longitudinal direction of each of the openings 56, 57, 58, and 59 extends from the second rotation center P2 in a direction orthogonal to the radial direction. However, in Figure 13 In the configuration shown, the second rotation center P2 is positioned on an extension (straight line) in the hole arrangement direction of the first hole 31 and the second hole 32. Correspondingly, the longitudinal direction of each of the openings 61, 62, 63, and 64 extends radially from the second rotation center P2. Therefore, the orientation of the plurality of openings provided in the shielding control plate 40 depends on the position of the second rotation center P2 relative to the hole arrangement direction of the measuring disk 30.

[0122] It should be noted that, Figure 13In the modified embodiment, the meshing position of the external tooth 41 and the internal tooth 36 is different. Figures 6 to 12 The engagement positions in the illustrated embodiments differ because the shapes (in the longitudinal direction) of openings 61, 62, 63, and 64 are different. Specifically, in Figures 6 to 12 In the embodiment shown, the first angular position for measuring the refractive properties in the horizontal direction is ( Figure 6 , 11 At position 12), the external tooth 41 meshes with the internal tooth 36 at one end (lower end) of the internal gear component 35 in the Y direction. Figure 13 In the first angular position shown, the external tooth 41 meshes with the internal tooth 36 at one end of the internal gear component 35 in the X direction.

[0123] exist Figure 14 In the modified embodiment shown, the light-transmitting portion is formed by a continuous opening 65 in the rotational direction about the second rotation center P2. The continuous opening 65 is formed as a long arc-shaped opening (slot) that is continuous (without segmentation or discontinuity) in the rotational direction, such that it is connected to... Figure 13 The openings 61 to 64 in the middle—the side portions that extend in the radial direction of the shielding control plate 40—are interconnected.

[0124] If an opening with a continuous shape in the rotational direction is used (e.g.) Figure 12 Continuous opening 60 or Figure 14 If the continuous opening 65 is provided, then the first beam L1 and the second beam L2 can pass through the first aperture 31 and the second aperture 32 not only at the first angular position to the fourth angular position but also at the intermediate angular position between the first angular position and the fourth angular position. In other words, in the light-transmitting state, the first beam L1 and the second beam L2 can pass through (through the first aperture 31 and the second aperture 32) while continuously changing the aperture arrangement direction of the first aperture 31 and the second aperture 32 within the range defined by the continuous opening 60 or the continuous opening 65. According to this structure, the refractive properties of the eye can be measured in various orientations.

[0125] exist Figure 15 In the modified embodiment shown, the light-transmitting portion is formed by four circular openings 66, 67, 68, and 69. The diameter (inner diameter) of each of the four openings 66, 67, 68, and 69 is greater than the distance between the first hole 31 and the second hole 32 in the hole arrangement direction, and coincides with the first hole 31 and the second hole 32 at the aforementioned first to fourth angular positions. The openings 66, 67, 68, and 69 having the above-described shape can have the same function as the openings 43, 44, 45, and 46 described above.

[0126] As can be understood from each modified embodiment, the multiple openings forming the multiple light-transmitting portions in the shielding control plate 40 can be selected from various different shapes, as long as the multiple openings coincide with the first hole 31 and the second hole 32, and allow the first beam L1 and the second beam L2 to pass through in the multiple hole arrangement direction.

[0127] Figure 16 and Figure 17 A second embodiment of the disk unit 70 with a rotational power transmission structure different from the first embodiment is shown. Note that, although... Figure 16 and Figure 17 Only one disc unit 70 is shown. The disc unit 70 for the right eye and the disc unit 70 for the left eye are mounted to the retainer member 21 in the same manner as the disc units 22 and 23 described above (see reference). Figure 5 )superior.

[0128] The measuring disk 71 of the disk unit 70, which constitutes the rotating component, corresponds to... Figure 1 The measuring disk 10 in the refractive measuring device shown is rotatably supported about a first rotation center P1 relative to the annular rim 25 of the retaining member 21. The measuring disk 71 is equipped with a first hole 72 and a second hole 73 formed at symmetrical positions on either side of the first rotation center P1. The first hole 72 and the second hole 73 both have the same configuration and function as the first hole 31 and the second hole 32 described above. In other words, the arrangement direction of the first hole 72 and the second hole 73 is the same as the hole arrangement direction of the measuring disk 71.

[0129] The shielding control plate 75 constitutes the second rotating member of the disc unit 70. The shielding control plate 75 is smaller in diameter than the measuring disc 71 and is rotatably supported relative to the annular rim 25 of the retaining member 21 about a second rotation center P2 eccentric to the first rotation center P1. In other words, the shielding control plate 75 is supported to rotate planetarily about the second rotation center P2 independently of the measuring disc 71. Therefore, the difference between the rotational support of the shielding control plate 75 and that of the disc units 22 and 23 described above is that the shielding control plate 75 is rotatably supported on the non-rotating retaining member 21, and not on the measuring disc 71, which is a rotating member.

[0130] In the light-blocking control plate 75, the light-transmitting portion is formed by four circular openings 76, 77, 78, and 79. The diameter (inner diameter) of each of the four openings 76, 77, 78, and 79 is greater than the distance between the first hole 72 and the second hole 73 in the hole arrangement direction. The light-blocking control plate 75 defines a closed portion (light-blocking portion) 80 in the rotational direction between the openings 76 and 79, which prevents light from passing through.

[0131] The measuring disc 71 is an external gear component with external teeth 74 on its outer periphery. The shielding control plate 75 is an external gear component with external teeth 81 on its outer periphery. The number of teeth of the external teeth 74 is greater than the number of teeth of the external teeth 81, and their ratio is 8:5 (for example, the number of teeth of the external teeth 74 is 64 and the number of teeth of the external teeth 81 is 40).

[0132] Measuring disc 71 and shielding control plate 75 are arranged in a forward / backward direction, and external gears 74 and 81 are positioned such that they coincide at one location in the rotational direction (shielding control plate 75 is tangent to measuring disc 71 in the front view). Furthermore, drive gear 82 is equipped with external gears 83 that mesh with both external gears 74 and 81 (at the aforementioned "one location" where these gears coincide). Drive gear 82 is rotatably supported about an axis 84 parallel to the first rotation center P1 and the second rotation center P2. Axle 84 is positioned on an extension of the line connecting the first rotation center P1 and the second rotation center P2, and is located further away from the first rotation center P1 than the second rotation center P2.

[0133] The external teeth 74 of the measuring disk 71, the external teeth 81 of the shielding control plate 75, and the drive gear 82 (external teeth 83) form a gear mechanism, such that the shielding control plate 75 rotates in association with the rotation of the measuring disk 71 via the drive gear 82; the gear mechanism causes the shielding control plate 75 to rotate about the second rotation center P2 by a rotation angle different from the unit rotation angle of the measuring disk 71 about the first rotation center P1.

[0134] The rotation of the drive gear 82 can be achieved by manual operation by the person being inspected or the person performing the inspection. Alternatively, a rotary drive device 85, such as a motor, can be used as a drive source to rotate the drive gear 82.

[0135] In disc unit 70, unlike the measuring disc 30 and shielding control plate 40 of disc unit 22 (23), the measuring disc 71 is located on the front side (closer to the light emitting device 13) and the shielding control plate 75 is located on the rear side (closer to the subject's eyes). Therefore, the shielding control plate 75 controls how the first beam L1 and the second beam L2 travel after passing through the first aperture 72 and the second aperture 73 of the measuring disc 71. In other words, disc unit 22 (23) and disc unit 70 differ in which side of the measuring disc 30 and which side of the disc unit 70 shields the first beam L1 and the second beam L2. Apart from this difference, disc unit 70 and disc unit 22 (23) function in the same manner.

[0136] Figure 16 and Figure 17The diagram shows the measuring disc 71 in a first angular position, where the hole arrangement directions of the first aperture 72 and the second aperture 73 are aligned with the X-direction (horizontal direction). In the shielding control plate 75, the opening 76 is positioned to coincide with the first aperture 72 and the second aperture 73. Therefore, the first light beam L1 and the second light beam L2, passing through the first aperture 72 and the second aperture 73, can travel backward through the opening 76, allowing the refractive properties of the eye to be measured at an orientation in the X-direction (horizontal direction).

[0137] When the drive gear 82 is rotatably driven from the first angular position, the measuring disk 71 and the shielding control plate 75 rotate accordingly, simultaneously changing the meshing position of the external teeth 74 and 81 relative to the external tooth 83. Specifically, the drive gear 82, the measuring disk 71, and the shielding control plate 75 rotate along... Figure 17 Rotate in the direction indicated by the medium-thick arrow.

[0138] When the measuring disk 71 rotates 45 degrees from the first angular position to the second angular position, the hole arrangement direction of the first hole 72 and the second hole 73 is tilted 45 degrees relative to the X direction. Furthermore, because the number of teeth between the external teeth 74 and 81 is different, the shielding control plate 75 rotates at a larger angle (72 degrees) than the measuring disk 71, causing the opening 77 to coincide with the first hole 72 and the second hole 73. Therefore, the first light beam L1 and the second light beam L2, passing through the first hole 72 and the second hole 73, can travel backward through the opening 77, allowing the refractive properties of the eye to be measured at an intermediate orientation (45-degree direction) between the X direction (horizontal direction) and the Y direction (vertical direction).

[0139] When the measuring disk 71 rotates 45 degrees from the second angular position to the third angular position, the hole arrangement direction of the first hole 72 and the second hole 73 extends in the Y direction. Furthermore, the shielding control plate 75 rotates at a greater angle (72 degrees) than the measuring disk 71, causing the opening 78 to coincide with the first hole 72 and the second hole 73. Therefore, the first light beam L1 and the second light beam L2, passing through the first hole 72 and the second hole 73, can travel backward through the opening 78, allowing the refractive properties of the eye to be measured at an orientation in the Y direction (vertical direction).

[0140] When the measuring disc 71 rotates 45 degrees from the third angular position to the fourth angular position, the hole arrangement direction of the first hole 72 and the second hole 73 is tilted by 45 degrees (i.e., 135 degrees) relative to the X direction of the second angular position, which is reversed from left to right. Furthermore, the shielding control plate 75 rotates at a greater angle (72 degrees) than the measuring disc 71, causing the opening 79 to coincide with the first hole 72 and the second hole 73. Therefore, the first beam L1 and the second beam L2, passing through the first hole 72 and the second hole 73, can travel backward through the opening 79, allowing the refractive properties of the eye to be measured at an intermediate orientation (135-degree direction) between the X direction (horizontal direction) and the Y direction (vertical direction).

[0141] When the measuring disc 71 rotates 45 degrees from the fourth angular position to the fifth angular position, the hole arrangement direction of the first hole 72 and the second hole 73 extends in the X direction. More specifically, the positions of the first hole 72 and the second hole 73 relative to... Figure 16 and 17 The first angular position shown is in a reverse orientation from left to right. Furthermore, the shielding control plate 75 rotates at a greater angle (72 degrees) than the measuring disk 71, causing the closing portion 80 to be positioned behind the first aperture 72 and the second aperture 73. Therefore, the closing portion 80 shields (blocks) the first beam L1 and the second beam L2 passing through the first aperture 72 and the second aperture 73.

[0142] Therefore, by setting the measuring disc 71 to the fifth angular position in one of the right eye disc unit 70 and the left eye disc unit 70, and by rotating the measuring disc 71 in the other of the right eye disc unit 70 and the left eye disc unit 70 sequentially from the first angular position to the fourth angular position, the refractive properties of each eye can be measured at each orientation.

[0143] Disk units 70 for the right eye and left eye are provided for use, and because no parts need to be replaced or replaced when testing one eye instead of the other, there is no need to perform operations to remove and attach (replace / replace) parts. Furthermore, in each disk unit 70, the measuring fixture 20 exhibits excellent operability because all operations, including setting the occlusion state and selecting the orientation for measuring refractive properties, can be performed solely by rotating the drive gear 82.

[0144] Furthermore, by using disc units 70 with the same structure for the right and left eyes respectively, the number of parts can be reduced, thereby lowering manufacturing costs.

[0145] Although Figure 16 and Figure 17 The openings 76, 77, 78 and 79 shown are all circular (circular), but as in the first embodiment of disk unit 22 (23), openings with shapes other than circular can be used as light-transmitting portions.

[0146] The disk units 22 and 23 of the first embodiment and the disk unit 70 of the second embodiment are assembled onto the subject (worn by the subject) such that each first rotation center P1, which is the rotation center of the measuring disk 30 (71), is aligned with the visual axis Q of the subject's eye. Figure 1 The first beam L1 and the second beam L2 passing through the first hole 72 and the second hole 73 are aligned and a set of a first hole 31 (72) and a second hole 32 (73) are provided on the measuring disk 30 (71). Furthermore, the transmission of the first beam L1 and the second beam L2 passing through the first hole 72 and the second hole 73 is controlled by using the light-transmitting part (multiple openings or a single continuous opening) and the light-blocking part (closed part) provided on the shielding control plate 40 (75) that overlaps with the measuring disk 30 (71).

[0147] Figures 18 to 22 A measuring disc 100 according to a third embodiment, different from the first and second embodiments described above, is shown. Note that although... Figures 18 to 22 Only one measuring disc 100 is shown, but the measuring disc 100 for the right eye and the measuring disc 100 for the left eye are mounted to the retaining member 21 in the same manner as the disc unit 22 and disc unit 23 described above (see reference). Figure 5 )superior.

[0148] The measuring disk 100 is rotatably supported relative to the annular rim 25 of the retaining member 21 about a third rotation center P3 that is eccentrically positioned with respect to the viewing axis Q. The measuring disk 100 is equipped with first holes 101A and second holes 102A, first holes and second holes 101B and 102B, first holes and second holes 101C and 102C, and first holes and second holes 101D and 102D at different positions in the radial direction from the third rotation center P3 and in the rotational direction about the third rotation center P3. In other words, the measuring disk 100 is equipped with four sets of first holes (101A to 101D) and second holes (102A to 102D). Furthermore, the measuring disk 100 is equipped with a closed portion (light-blocking portion) 103 in the region (section) of the measuring disk 100 other than the four sets of first holes and second holes (101A to 101D and 102A to 102D) in the rotational direction, which prevents light from passing through.

[0149] The hole arrangements in each of the four groups of the first and second holes (101A to 101D and 102A to 102D) are parallel to each other. Furthermore, the centers of the corresponding four groups of the first and second holes (101A to 101D and 102A to 102D) are equidistant from each other, and each of these distances is determined to reflect the Scheiner principle.

[0150] The rotation of the measuring disc 100 can be manually operated by the examinee or the person performing the examination. Alternatively, a rotary drive device 104, which serves as a drive source such as a motor, can be used (only in...). Figure 18 (As shown in the image) can be used to rotate the measuring disc 100.

[0151] Figure 18 The diagram shows the measuring disk 100 positioned at a first angular position. At this position, the first aperture 101A and the second aperture 102A are arranged symmetrically on either side of the viewing axis Q in the X direction. In other words, the aperture arrangement directions of the first aperture 101A and the second aperture 102A are aligned with the X direction. Subsequently, based on the first beam L1 and the second beam L2 (reference) passing through the first aperture 101A and the second aperture 102A respectively... Figure 1 The images formed on the retina (visual marker images 14M and 15M) can be used to measure the refractive properties of the eye in an orientation in the X direction (horizontal direction) that corresponds to the aperture arrangement orientation of the first aperture 101A and the second aperture 102A.

[0152] exist Figure 18 In the illustrated state, the hole arrangement direction of the corresponding holes in the other three groups (first hole 101B and second hole 102B, first hole 101C and second hole 102C, and first hole 101D and second hole 102D) extends in the X direction in the same manner as first hole 101A and second hole 102A. Furthermore, the distance in the X direction between the centers of first hole 101B and second hole 102B, the distance in the X direction between the centers of first hole 101C and second hole 102C, and the distance in the X direction between the centers of first hole 101D and second hole 102D are the same as the distance in the X direction between the centers of first hole 101A and second hole 102A.

[0153] Figure 19 It shows that the measuring disc 100 has been removed from Figure 18 The first angular position shown is rotated 45 degrees, and in the front view, it is rotated counterclockwise around the third rotation center P3 to the second angular position. In this state, the holes on either side of the viewing axis Q are changed (switched) to the first hole 101B and the second hole 102B, such that the hole arrangement direction of the first hole 101B and the second hole 102B is tilted upward and to the right by 45 degrees relative to the X direction.

[0154] Therefore, by setting the measuring disk 100 to Figure 19 The position shown (second angular position) is based on the first beam L1 and the second beam L2 passing through the first aperture 101B and the second aperture 102B respectively (reference). Figure 1The images formed on the retina (visual marker images 14M and 15M) can be used to measure the refractive properties of the eye at a first intermediate orientation (45-degree direction) between the X direction (horizontal direction) and the Y direction (vertical direction), which corresponds to the aperture arrangement direction of the first aperture 101B and the second aperture 102B.

[0155] Figure 20 It shows that the measuring disc 100 has been removed from Figure 19 The second angular position shown is rotated 45 degrees, and in the front view, it is rotated counterclockwise around the third rotation center P3 to the third angular position. In this state, the holes located on either side of the viewing axis Q are changed (switched) to the first hole 101C and the second hole 102C, such that the hole arrangement direction of the first hole 101C and the second hole 102C extends in the Y direction.

[0156] Therefore, by setting the measuring disk 100 to Figure 20 The position shown (third angle position) is based on the first beam L1 and the second beam L2 passing through the first aperture 101C and the second aperture 102C respectively (reference). Figure 1 The images formed on the retina (visual marker images 14M and 15M) can be used to measure the refractive properties of the eye in the Y direction (vertical direction), which corresponds to the aperture arrangement direction of the first aperture 101C and the second aperture 102C.

[0157] Figure 21 It shows that the measuring disc 100 has been removed from Figure 20 The state shown is a 45-degree rotation from the third angular position. In the front view, it is rotated counterclockwise around the third rotation center P3 to the fourth angular position. In this state, the holes located on either side of the viewing axis Q are changed (switched) to the first hole 101D and the second hole 102D, such that the hole arrangement direction of the first hole 101D and the second hole 102D is tilted downward and to the right by 45 degrees relative to the X direction. Because this hole arrangement direction is relative to ( Figure 19 The hole arrangement direction at the second angle position is reversed from right to left, relative to ( Figure 18 The first angle position is set to 0 degrees for the hole arrangement direction, and the hole arrangement direction has been changed by 135 degrees.

[0158] Therefore, by setting the measuring disk 100 to Figure 21 The position shown (fourth angle position) is based on the first beam L1 and the second beam L2 passing through the first aperture 101D and the second aperture 102D respectively (reference). Figure 1The images formed on the retina (visual marker images 14M and 15M) can be used to measure the refractive properties of the eye at a second intermediate orientation (135-degree direction) between the X direction (horizontal direction) and the Y direction (vertical direction), which corresponds to the aperture arrangement direction of the first aperture 101D and the second aperture 102D.

[0159] Figure 22 It shows that the measuring disc 100 has been removed from Figure 21 The fourth angular position shown is rotated 45 degrees, and in the front view, it is rotated counterclockwise around the third rotation center P3 to the fifth angular position. In this state, the closed portion 103 is positioned on the visual axis Q and its surrounding area, such that the transmission of the first beam L1 and the second beam L2 is blocked by the closed portion 103 in the subject's field of vision. Figure 1 ).

[0160] Therefore, by setting the measuring disk 100 to Figure 22 At the position shown (fifth angle position), each of the four groups of the first and second apertures (101A to 101D and 102A to 102D) is in a light-blocking state in which the first beam L1 and the second beam L2 cannot be transmitted to the retina.

[0161] As mentioned above, the refractive properties of the eye can be measured in multiple directions ( Figures 18 to 21 The first beam L1 and the second beam L2 can be blocked by rotating the measuring disk 100 around the third rotation center P3. Figure 22 Because separate measuring discs 100 for the right eye and left eye are provided for use, and because no parts need to be replaced or replaced when switching from one eye to the other for testing, there is no need to perform operations involving the removal and attachment (replacement / replacement) of parts. Furthermore, in each measuring disc 100, all operations of setting the occlusion state and selecting the orientation for measuring refractive properties can be performed solely by rotating the measuring disc 100 itself, thus exhibiting excellent operability. Moreover, by using measuring discs 100 with the same structure for the right and left eyes respectively, the number of parts can be reduced, thereby lowering manufacturing costs.

[0162] Furthermore, by appropriately arranging multiple groups of the first apertures (101A to 101D) and the second apertures (102A to 102D), all functions related to the transmission and shielding of the first beam L1 and the second beam L2 can be integrated onto a single measuring disk 100. Therefore, the number of components used to construct the refractive measuring device can be reduced, thereby simplifying the structure and lowering costs.

[0163] As described above, the refractive measurement apparatus of each disclosed embodiment (including modified embodiments) can reduce the time and effort required to measure the refractive properties of a subject's eyes. In particular, it exhibits excellent operability when performed manually because the measurement orientation can be easily changed and the shading state switched through a series of rotational operations. Furthermore, when the rotating member is rotatably driven by a rotational drive device (27, 85, and 104), a rotational drive device with a miniaturized, lightweight, and low-cost construction can also be used.

[0164] In addition, because the measuring clamp (20) worn by the examinee can be miniaturized, lightweight and constructed from a small number of parts, it does not require a large installation space or high-cost installation; in addition, it has the advantage of reducing the physical burden on the examinee.

[0165] While the above description is based on specific embodiments shown in the accompanying drawings, the invention is not limited thereto; various modifications and variations are permitted within the spirit and scope of the claimed invention.

[0166] For example, the number of orientations used to measure the refractive properties of the eye can be any number other than the four orientations disclosed in the embodiments described above. As an example, in addition to the horizontal (X-direction) and vertical (Y-direction) directions, only one intermediate orientation can be provided between the horizontal and vertical directions to perform measurements at three different orientations. Alternatively, the number of intermediate orientations can be increased to perform measurements at five or more orientations. The arrangement of the first and second holes in the measuring disk, the configuration of the light-transmitting and light-blocking portions in the light-blocking control plate, and the relative angle settings (the number of teeth in the case of a gear mechanism) when the measuring disk and the light-blocking control plate rotate accordingly can be modified according to the number of measurement orientations.

Claims

1. A refractive measurement device for measuring the refractive properties of an eye based on corresponding images formed by a first light beam and a second light beam emitted from a light emitter, the first light beam and the second light beam passing through a first aperture and a second aperture respectively and simultaneously incident on the eye, the first aperture and the second aperture being disposed at the same distance from the light emitter, the refractive measurement device comprising, at corresponding positions corresponding to a pair of eyes: A first rotating member is rotatably supported on a supporting member about a first rotation center, and is provided with a first hole and a second hole on either side of the first rotation center; The second rotating member is rotatably supported at a position different from the first rotating center about a second rotation center. The second rotating member is equipped with at least one light-transmitting portion and a light-blocking portion at different positions in the rotation direction about the second rotation center. Wherein, when the first rotating member rotates relative to the supporting member, the second rotating member rotates along with the rotation of the first rotating member, and When the hole arrangement orientation of the first and second holes changes according to the rotation of the second rotating member, the refractive measuring device enters one of the following: In a light-transmitting state, the light-transmitting portion overlaps with the first and second holes to allow the first and second light beams to pass through the first and second holes; and In the light-blocking state, the light-blocking portion overlaps with the first hole and the second hole to block the first beam and the second beam.

2. The refraction measuring device according to claim 1 is further equipped with a gear mechanism for rotating the second rotating member around the second rotation center by a rotation angle different from the unit rotation angle of the first rotating member around the first rotation center.

3. The refractive measuring device according to claim 2, wherein the annular internal gear centered at the first rotation center is fixedly mounted on the support member. in, The second rotating member is rotatably supported on the first rotating member about the second rotation center. The second rotating member is equipped with external teeth that mesh with the internal teeth, and When the first rotating member rotates, the second rotating member rotates simultaneously, changing the meshing position between the internal teeth and the external teeth.

4. The refraction measuring device according to claim 2, wherein, The second rotating member is rotatably supported on the supporting member about the second rotation center. The first and second rotating components are each equipped with external teeth, and each external tooth has a different number of teeth. The system also provides a drive gear that meshes with the external teeth of the first rotating member and the external teeth of the second rotating member. When the drive gear rotates, the rotation of the first rotating member and the second rotating member simultaneously changes the meshing position between the drive gear and the corresponding external teeth of the first rotating member and the second rotating member.

5. The refractive measuring apparatus according to any one of claims 1 to 4, wherein, The light-transmitting portion includes multiple openings formed by the second rotating member at different positions in the rotational direction around the second rotation center, and In the light-transmitting state, the first hole and the second hole coincide with each corresponding opening in the plurality of openings, and are oriented in a plurality of hole arrangement directions around the first rotation center, thereby allowing the first beam and the second beam to pass through the first hole and the second hole.

6. The refraction measuring device according to claim 5, wherein, Four of the openings are provided in the second rotating member, wherein, for every 45 degrees of rotation of the first rotating member, the first hole and the second hole coincide with each corresponding opening of the four openings.

7. The refractive measuring apparatus according to any one of claims 1 to 4, wherein, The light-transmitting portion includes a continuous opening formed in the rotational direction around the second rotation center, and In the light-transmitting state, the first hole and the second hole allow the first light beam and the second light beam to pass through, while the arrangement direction of the holes is continuously changed within the range defined by the continuous openings.

8. A refractive measurement device for measuring the refractive properties of an eye based on corresponding images formed by a first light beam and a second light beam emitted from a light emitter, the first light beam and the second light beam passing through a first aperture and a second aperture respectively and simultaneously incident on the eye, the first aperture and the second aperture being disposed at the same distance from the light emitter, the refractive measurement device comprising: The rotating component is rotatably supported at a position corresponding to a pair of eyes. Each rotating component is equipped with multiple sets of the first and second holes and a light-shielding portion at a corresponding position eccentrically positioned with respect to the rotation center of the associated rotating component, and Wherein, when the corresponding hole arrangement orientation of the plurality of groups of the first and second holes changes according to the change of the angular position of the associated rotating member in the rotation direction, the refractive measuring device enters one of the following: In a light-transmitting state, the first beam and the second beam simultaneously pass through a set of the first and second apertures on either side of the viewing axis; and In the light-blocking state, the light-blocking portion blocks the first beam and the second beam from the field of view.

9. The refraction measuring device according to claim 8, wherein, Each rotating component is equipped with four sets of the first hole and the second hole.

10. The refractive measuring apparatus according to claim 8 or 9, wherein, The hole arrangement directions of each group of the first and second holes in each rotating component are parallel to each other.

11. The refractive measuring apparatus according to any one of claims 8 to 10, wherein the centers of the corresponding groups of the first and second holes are equidistant from each other.

Images