CN-115956876-B - Fundus camera optical system with diaphragm and fundus camera

CN115956876BCN 115956876 BCN115956876 BCN 115956876BCN-115956876-B

Abstract

The present disclosure relates to a fundus camera optical system having a diaphragm, including an illumination device including an illumination light source, a first optical assembly including a first half mirror, a first polarizing plate, a second half mirror, and a web objective, a second optical assembly including a second polarizing plate and a focusing module that guides a reflected light of a fundus to the second optical assembly, an imaging device that receives light from the second optical assembly to form a fundus image, and a positioning device including a guide light source and a diaphragm, the guide light source having a preset shape after passing through the diaphragm, the imaging device acquiring fundus images of different areas of the eye based on the guide light source, the first optical assembly guiding the light beam of the guide light source to the fundus of the eye to image.

Inventors

HU ZHIGANG
CHEN ZHI
CHEN YI

Assignees

深圳硅基智能科技有限公司

Dates

Publication Date: 20260508
Application Date: 20191201

Claims (10)

1. A fundus camera optical system having a diaphragm, characterized in that: comprises an illumination device, a first optical component, a second optical component, an imaging device and a positioning device; The lighting device comprises a lighting source; the first optical assembly comprises a first half mirror, a first polarizing plate, a second half mirror and a omentum objective lens, wherein the first polarizing plate is used for converting the light beam received by the first half mirror from the illumination light source into first polarized light with a first polarization state, the second half mirror is used for reflecting the first polarized light to the omentum objective lens, the omentum objective lens is used for guiding the received first polarized light to the fundus of the eye to be inspected and receiving the reflected light of the fundus, and the second half mirror is used for receiving the reflected light passing through the omentum objective lens and guiding the reflected light to the second optical assembly; the second optical assembly comprises a second polaroid and a focusing module, the reflected light is converted into second polarized light with a second polarization state through the second polaroid, and the focusing module guides the second polarized light to the imaging device; the imaging device is used for receiving the second polarized light to form a fundus image; The positioning device comprises a guide light source and a diaphragm, wherein the diaphragm is used for enabling light beams of the guide light source to have a preset shape, the guide light source is used for guiding the sight direction of the eye to be inspected, the light beams of the guide light source pass through the diaphragm to reach the first half-reflecting mirror, the light beams of the guide light source pass through the diaphragm and then are formed to have the preset shape, the imaging device obtains fundus images of different areas of the eye to be inspected based on the guide light source, and the first optical assembly guides the light beams of the guide light source to the fundus of the eye to be inspected for imaging.
2. The fundus camera optical system according to claim 1, wherein, The illumination light source is an annular light source.
3. The fundus camera optical system according to claim 1, wherein, The lighting device comprises a light equalizing sheet for equalizing light beams from the lighting light source.
4. The fundus camera optical system according to claim 3, wherein, The light homogenizing sheet has a conjugate relation with the pupil of the eye to be inspected.
5. The fundus camera optical system according to claim 1, wherein, The positioning device comprises a lens positioned between the guide light source and the diaphragm, and the light beam of the guide light source passes through the lens to form parallel light.
6. The fundus camera optical system according to claim 5, wherein, The directing light source is positioned at a focal point of the lens.
7. The fundus camera optical system according to claim 1, wherein, The polarization direction of the first polarization state is orthogonal to the polarization direction of the second polarization state.
8. The fundus camera optical system according to claim 1, wherein, The diaphragm has an aperture having the predetermined shape.
9. The fundus camera optical system according to claim 1, wherein, The fundus of the eye to be inspected is in conjugate relation with the diaphragm.
10. A fundus camera, characterized in that: Comprising the following steps: the fundus camera optical system according to any one of claims 1 to 9, and A peripheral device connected to the imaging device, Wherein the peripheral device further comprises: a control module for controlling movement of optical elements within the first and second optical assemblies, and An information processing module for processing imaging information captured by the imaging device.

Description

Fundus camera optical system with diaphragm and fundus camera The application relates to a patent application of a fundus camera, which is a patent application of which the application date is 2019, 12, 01, the application number is 201911209363.5 and the application name is an optical system of the fundus camera. Technical Field The disclosure relates to the technical field of medical instruments, in particular to a fundus camera optical system with a diaphragm and a fundus camera. Background The retina of the fundus of the human eye is distributed with a large number of capillaries, which can cause lesions in the capillaries on the retina of a patient when the patient suffers from diseases such as diabetes, glaucoma, maculopathy, hypertension, etc. Medical staff can judge whether the patient suffers from the diseases by observing the microvascular network on the retina. Currently, in actual clinical diagnosis, medical staff generally acquires fundus images of a patient using a fundus camera to obtain a diagnosis result of the patient. Existing fundus cameras mostly include an illumination system and an imaging system. The illumination system provides illumination light, the illumination light reaches the eyeground of the human eye to generate eyeground reflection light, and the eyeground reflection light passes through the imaging system to form an eyeground image. For example, patent document 1 (patent application publication No. CN105581771 a) discloses a fundus camera including a fixation light source. In the fundus camera of patent document 1, an image sensing element and a fixation lamp element are positioned on an equivalent focal plane of an imaging lens group by an optical element, and the fixation lamp element and the image sensing element share an imaging system, so that a fixation light source is incident on the fundus of an eyeball. However, in patent document 1 described above, the fixation light source of the fundus camera uses the same optical path as the image sensing element, resulting in weaker reflected light of the fundus of the human eye compared with reflected light of the cornea of the eye, and a large amount of stray light is generated at the time of photographing by the fundus camera. Disclosure of Invention The present disclosure has been made in view of the above-described circumstances, and an object thereof is to provide an optical system of a fundus camera and a fundus camera capable of reducing stray light generated when photographing a fundus of an eye to be inspected. To this end, the present invention discloses an optical system of a fundus camera, characterized in that: comprises an illumination device having an illumination light source; a first optical assembly having a first half mirror for converting a light beam received by the first half mirror from the illumination light source into a first polarized light having a first polarization state, a first polarizing plate for reflecting the first polarized light to the web objective for guiding the received first polarized light to the fundus of the eye under examination and receiving the reflected light of the fundus, a second half mirror for receiving the reflected light passing through the web objective and guiding the reflected light to a second optical assembly having a second polarizing plate for obtaining a second polarized light having a second polarization state by using the reflected light, and a focusing module for guiding the second polarized light to an imaging device for receiving the second polarized light to form an image, and a positioning device for guiding the received first polarized light to the fundus of the eye under examination, wherein the second optical assembly is capable of guiding the reflected light from the fundus of the eye under examination in a direction orthogonal to the first polarization direction of the eye under examination, the second optical assembly being capable of guiding the light beam to the first optical axis of the eye under examination, wherein the second optical assembly is capable of guiding the second polarized light source to the eye under examination, and the second optical assembly is capable of guiding the second polarized light to the imaging device, the second half mirror is placed at 45 degrees to the optical axis. In the present disclosure, a light beam provided by an illumination light source in an illumination device passes through a first polarizing plate to form first polarized light having a first polarization state, and the first polarized light is incident on an eye to be examined and reflected at a fundus to generate reflected light. The reflected light passes through the second polarizer to form second polarized light having a second polarization state, and the second polarized light reaches the imaging device to form a fundus image. In this case, the reflection of the first polarized light at the web objective and the cornea of the eye to be examined p