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CN-121987142-A - Ophthalmic device

CN121987142ACN 121987142 ACN121987142 ACN 121987142ACN-121987142-A

Abstract

An ophthalmic apparatus includes an objective lens, an illumination optical system, an optical scanner, a light receiving optical system, and a pupil division member. The illumination optical system includes an illumination diaphragm having one or more openings formed at positions deviated from the optical axis, and irradiates slit-shaped illumination light. The optical scanner deflects illumination light and guides the illumination light to an eye to be inspected by means of an objective lens. The light receiving optical system guides return light of illumination light from the eye to be inspected via the objective lens to the image sensor. The pupil division member includes a photographing aperture in which one or more openings are formed at positions deviated from the optical axis, and spatially separates an optical path of the illumination optical system from an optical path of the light receiving optical system.

Inventors

  • Fu Tiankong
  • NAKA DAISUKE
  • Haruki Masaya

Assignees

  • 株式会社拓普康

Dates

Publication Date
20260508
Application Date
20251029
Priority Date
20241106

Claims (15)

  1. 1. An ophthalmic device comprising: An objective lens; An illumination optical system including an illumination diaphragm disposed at a position substantially optically conjugate with a pupil of an eye to be inspected and having one or more openings formed at positions deviated from an optical axis, the illumination optical system irradiating slit-shaped illumination light; an optical scanner disposed at a position substantially optically conjugate with the pupil, for deflecting the illumination light and guiding the illumination light to the eye to be inspected via the objective lens; A light receiving optical system for guiding the return light of the illumination light from the eye to be inspected through the objective lens to an image sensor arranged at a position substantially optically conjugate with the imaging part of the eye to be inspected, and And a pupil dividing member including an imaging aperture disposed at a position substantially optically conjugate with the pupil and having one or more openings formed at positions offset from an optical axis, the pupil dividing member spatially separating an optical path of the illumination optical system from an optical path of the light receiving optical system.
  2. 2. The ophthalmic device of claim 1 wherein the ophthalmic device, The illumination optical system includes a slit disposed at a position substantially optically conjugate with the imaging portion and having a slit-like opening formed therein, and is configured to irradiate light from a light source to the slit.
  3. 3. The ophthalmic device of claim 1 wherein the ophthalmic device, The pupil-dividing section further includes a reflecting section that deflects the illumination light deflected by the optical scanner toward the eye to be inspected.
  4. 4. The ophthalmic device of claim 1 wherein the ophthalmic device, The pupil-dividing member is a hole mirror provided with a reflecting member around an opening formed in the photographing aperture.
  5. 5. The ophthalmic device of claim 1 wherein the ophthalmic device, The image sensor is configured to collect a light receiving result in a virtual opening area of a light receiving surface corresponding to an irradiation area at the photographing position where the illumination light is moved in a predetermined scanning direction by the optical scanner in a rolling shutter manner.
  6. 6. The ophthalmic device of claim 5 wherein the ophthalmic device, The image sensor is a complementary metal oxide semiconductor image sensor.
  7. 7. The ophthalmic device of claim 1 wherein the ophthalmic device, The ophthalmic device includes: An image forming unit that forms an image of the eye to be inspected based on a light receiving result at a light receiving surface of the image sensor.
  8. 8. The ophthalmic device of claim 1 wherein the ophthalmic device, The shooting part is a fundus.
  9. 9. The ophthalmic device of any one of claims 1-8 wherein, A single opening is formed in the illumination aperture, A single opening is formed in the photographing aperture.
  10. 10. The ophthalmic device of any one of claims 1-8 wherein, The one or more apertures are formed in the illumination diaphragm and the one or more apertures are formed in the photographing diaphragm such that a pupil separation amount, which is a shortest distance in an arrangement direction between an image formed in the one or more apertures of the illumination diaphragm and an image formed in the one or more apertures of the photographing diaphragm in a pupil conjugate plane at a position substantially optically conjugate with the pupil, is greater than a predetermined center ghost image generation suppression threshold.
  11. 11. The ophthalmic device of claim 10 wherein the ophthalmic device, The one or more openings are formed in the illumination diaphragm and the one or more openings are formed in the photographing diaphragm such that the pupil separation amount is substantially constant in a direction orthogonal to the arrangement direction.
  12. 12. The ophthalmic device of claim 10 wherein the ophthalmic device, The predetermined center ghost generation suppressing threshold is determined based on a working distance of the ophthalmic device, a visual acuity of a photographable eye to be inspected, a visual angle of the illumination light with respect to the photographing part, and a visual angle of the return light with respect to the fundus.
  13. 13. The ophthalmic device of claim 12 wherein the ophthalmic device, The vision is that of a highly myopic eye.
  14. 14. The ophthalmic device of claim 12 wherein the ophthalmic device, The one or more openings are formed in the illumination diaphragm and the one or more openings are formed in the photographing diaphragm in such a manner that the pupil separation amount is smaller than a predetermined small pupil photographable threshold.
  15. 15. The ophthalmic device of claim 14 wherein the ophthalmic device, The predetermined small pupil photographing threshold is determined based on a pupil diameter for photographing a predetermined small pupil, a width of the one or more openings of the illumination diaphragm in the arrangement direction, and a width of the one or more openings of the photographing diaphragm in the arrangement direction.

Description

Ophthalmic device Technical Field The present disclosure relates to ophthalmic devices. Background In recent years, screening using ophthalmic devices has been applied. Such an ophthalmic device is expected to be applied to self-test, and further miniaturization and weight reduction are expected. An ophthalmic device is disclosed in U.S. Pat. No. 7831106 and U.S. Pat. No. 8237835, which are configured to pattern-illuminate the fundus of an eye to be examined with slit-shaped illumination light, and to detect return light thereof with an image sensor. The ophthalmic device can obtain a clear fundus image with a simple structure by adjusting an illumination pattern and a light receiving timing based on an image sensor. In such an ophthalmic device, it is necessary to make illumination light pass through the pupil of the eye to be examined and enter the eye, and to make reflected light (return light, fundus reflection light) of the illumination light from the fundus oculi pass through the pupil and exit. Therefore, in the ophthalmic apparatus, an image of an illumination opening through which illumination light passes and an image of a light receiving opening (imaging opening) through which reflected light passes are separated on a pupil conjugate surface at a position substantially optically conjugate with the pupil of the subject's eye. An ophthalmic device is disclosed in international publication No. 2021/205965, in which an ocular fundus is illuminated with slit-like illumination light passing through two illumination openings, and return light from the ocular fundus passing through a single light receiving opening is received. In this ophthalmic device, the slit-shaped illumination light is generated by irradiating illumination light to the slit formed to suppress the generation of glare. Japanese patent application laid-open No. 2020-6172 discloses an ophthalmic device configured to shift the alignment reference position with respect to the subject's eye in accordance with the size of the pupil diameter, thereby accommodating the image of the illumination opening and the image of the light receiving opening in the pupil of the subject's eye to be photographed. Disclosure of Invention One embodiment of the present invention is an ophthalmic apparatus including an objective lens, an illumination optical system including an illumination diaphragm disposed at a position substantially optically conjugate to a pupil of an eye to be inspected and having one or more openings formed at positions offset from an optical axis, the illumination optical system radiating slit-shaped illumination light, an optical scanner disposed at a position substantially optically conjugate to the pupil and deflecting the illumination light to be guided to the eye to be inspected via the objective lens, a light receiving optical system guiding return light of the illumination light from the eye to be inspected via the objective lens to an image sensor disposed at a position substantially optically conjugate to an image pickup portion of the eye to be inspected, and a pupil dividing member including an image pickup diaphragm disposed at a position substantially optically conjugate to the pupil and having one or more openings formed at positions offset from the optical axis, the pupil dividing member spatially separating an optical path of the illumination optical system from an optical path of the light receiving optical system. Drawings Fig. 1 is a schematic diagram illustrating a configuration example of an optical system of an ophthalmic apparatus according to an embodiment. Fig. 2 is a schematic diagram illustrating a configuration example of an optical system of the ophthalmic apparatus according to the embodiment. Fig. 3 is a schematic diagram illustrating a configuration example of an optical system of the ophthalmic apparatus according to the embodiment. Fig. 4 is a schematic diagram for explaining the configuration of an optical system of the ophthalmic apparatus according to the embodiment. Fig. 5 is an explanatory diagram of the operation of the ophthalmic device of the embodiment. Fig. 6 is an explanatory diagram of the operation of the ophthalmic device of the embodiment. Fig. 7 is an explanatory diagram of the operation of the ophthalmic device of the embodiment. Fig. 8 is a schematic diagram for explaining the configuration of an optical system of the ophthalmic apparatus according to the embodiment. Fig. 9 is a schematic diagram for explaining the configuration of an optical system of the ophthalmic apparatus according to the embodiment. Fig. 10 is a schematic diagram for explaining the configuration of an optical system of the ophthalmic apparatus according to the embodiment. Fig. 11 is a schematic diagram showing a configuration example of a processing system of an ophthalmic device according to the embodiment. Fig. 12 is a flowchart showing an example of the operation of the ophthalmic device of the embodiment. Fi