CN-121987141-A - Ophthalmic device

CN121987141ACN 121987141 ACN121987141 ACN 121987141ACN-121987141-A

Abstract

An ophthalmic apparatus includes an objective lens, an illumination optical system, an optical scanner, a photographing optical system, and a pupil division section. The illumination optical system includes an illumination diaphragm formed with one or more illumination openings, 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 photographing optical system guides return light of the illumination light to the image sensor. The pupil division member includes a photographing aperture formed with one or more photographing apertures, and spatially separates optical paths of the illumination optical system and the photographing optical system. An illumination opening and a photographing opening are formed such that the pupil separation amount is larger than a predetermined center ghost image generation suppressing threshold.

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 (11)

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 illumination openings formed therein, 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; An imaging optical system for guiding return light of illumination light from the eye to be inspected via the objective lens to an image sensor arranged at a position substantially optically conjugate with an imaging portion of the eye to be inspected, and A pupil dividing member including an imaging aperture disposed at a position substantially optically conjugate with the pupil and having one or more imaging apertures formed therein, the pupil dividing member spatially separating an optical path of the illumination optical system from an optical path of the imaging optical system, The illumination opening and the photographing opening are formed such that a pupil separation amount, which is the shortest distance in an arrangement direction of an image of the illumination opening and an image of the photographing opening in a pupil conjugate plane at a position substantially optically conjugate with the pupil, is larger than a predetermined center ghost image generation suppressing threshold.
2. The ophthalmic device of claim 1 wherein the ophthalmic device comprises, The illumination opening and the photographing opening are formed such that the pupil separation amount is substantially constant in a direction orthogonal to the arrangement direction.
3. The ophthalmic device of claim 2 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.
4. The ophthalmic device of claim 3 wherein the ophthalmic device, The vision is that of a highly myopic eye.
5. The ophthalmic device of claim 3 wherein the ophthalmic device, When WD is the working distance, D is the visibility, a is the angle of view of the illumination light, γ is the angle of view of the return light, GP is the pupil separation amount, the following expression (1) is satisfied, [ Mathematics 1]
6. The ophthalmic device of any one of claims 1-5 wherein, The illumination opening and the photographing opening are formed such that the pupil separation amount is smaller than a predetermined small pupil photographing threshold.
7. The ophthalmic device of claim 6 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 image of the illumination opening in the arrangement direction, and a width of the image of the photographing opening in the arrangement direction.
8. The ophthalmic device of claim 7 wherein the ophthalmic device, Assuming that the predetermined pupil diameter for small pupil photographing is Φ, the width of the image of the illumination opening in the arrangement direction is g, the width of the image of the photographing opening in the arrangement direction is h, and the pupil separation amount is GP, the following expression (2) is satisfied, [ Math figure 2] φ-(g+h)>GP (2)。
9. 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.
10. The ophthalmic device of claim 9 wherein the ophthalmic device, The image sensor is a complementary metal oxide semiconductor image sensor.
11. The ophthalmic device of claim 1 wherein the ophthalmic device, The shooting part is a fundus.

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 the illumination opening through which the illumination light passes and an image of the imaging opening (light receiving opening) through which the reflected light passes are separated on a pupil conjugate surface at a position substantially optically conjugate to 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 photographing 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 photographing opening in the pupil of the subject's eye to be photographed. Disclosure of Invention One embodiment of the present invention is an ophthalmic device including an objective lens, an illumination optical system including an illumination aperture disposed at a position substantially optically conjugate to a pupil of an eye to be inspected and having one or more illumination apertures formed therein, 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, an imaging 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 imaging position of the eye to be inspected, and a pupil dividing member including an imaging aperture disposed at a position substantially optically conjugate to the pupil and having one or more imaging apertures formed therein, the pupil dividing member spatially separating an optical path of the illumination optical system from an optical path of the imaging optical system so that a pupil separation amount is larger than a predetermined center image generation suppression threshold, the illumination aperture and the aperture being formed, and the pupil separation amount being arranged so that the pupil separation amount is a pupil image conjugate to an imaging aperture in a pupil plane substantially conjugate to the pupil image. 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