CN214761033U

CN214761033U - Optical system of internal reading type projection vision instrument

Info

Publication number: CN214761033U
Application number: CN202022656025.0U
Authority: CN
Inventors: 王婧盈; 蔡留美; 张震; 杜海法
Original assignee: Shanghai Supore Instruments Co ltd
Current assignee: Shanghai Supore Instruments Co ltd
Priority date: 2020-11-17
Filing date: 2020-11-17
Publication date: 2021-11-19
Anticipated expiration: 2030-11-17

Abstract

The utility model discloses an optical system of interior formula of reading projection eyesight appearance, light source in this optical system, even slide, look the CD, the window shade, the plane reflector is interval arrangement in proper order, it constitutes the carousel through the pivot to look CD and window shade and sets up in the light path between even slide and plane reflector, the plane reflector is 45 degrees angles with incident light path and arranges, spectroscope and concave surface reflector interval arrangement in proper order are in the reflected light path of plane reflector, the spectroscope is 45 degrees angles with incident light path and arranges, the outside of spectroscope and concave surface reflector is located to the protection glass board, it has the window to open at the middle part of the backlight board, the incident light path of plane reflector is located to the backlight board, and incident light path passes the window. The optical system overcomes the defect of the vision inspection of the traditional internal reading type projection vision tester, effectively improves the scene backlight of the vision inspection, avoids the great difference of the light environment inside and outside the dark box, improves the comfort of the eyes of the examinee, and ensures the accuracy of the vision inspection.

Description

Optical system of internal reading type projection vision instrument

Technical Field

The utility model relates to an optical instrument technical field especially relates to an interior formula projection eyesight appearance optical system that reads.

Background

In the vision examination process, as shown in fig. 1, a light box chart 1 for examining vision is usually hung 5m from the front of a subject 2, and thus a general optometry room must be equipped with a suitably large area. Projection-type and liquid crystal screen eye charts developed in recent years replace traditional light box eye charts, and large-area optometry rooms are also needed.

In order to reduce the area of the optometry room, as shown in fig. 2, a plane mirror 3 can be placed 2.5m in front of the examinee 2, the light box visual chart 1 or the liquid crystal screen visual chart is placed behind the examinee, and the examinee 2 can watch a virtual image 11 of the light box visual chart 1 or the liquid crystal screen visual chart through reflection of the plane mirror 3 so as to achieve the same visual examination effect. However, in a modern optometry room, various optometry machines, test strips, comprehensive optometry tables and other devices are generally required to be added, so that virtual images reflected by the plane mirrors are blocked, and the vision examination is affected.

The recent market has introduced an internal reading type projection vision tester which compresses the eye chart in a box with a length of 320mm, a width of 400mm and a height of 600mm, as shown in fig. 3, the internal reading type projection vision tester 4 is placed at 1.1 m in front of the subject 2, and the virtual image 41 is located at 5m in front of the subject 2, thereby avoiding the defects of the previous vision tests.

As shown in fig. 4, the inside of the vision tester is sequentially provided with a light source 42, a light uniformizing sheet 43, a viewing disc 44, a shading disc 45 and a plane reflective mirror 46, the viewing disc 44 and the shading disc 45 form a rotating disc through a rotating shaft 50 and are arranged on a light path between the light uniformizing sheet 43 and the plane reflective mirror 46, the plane reflective mirror 46 is arranged at an angle of 45 degrees with an incident light path, a spectroscope 47 and a concave reflective mirror 48 are sequentially arranged on a reflected light path of the plane reflective mirror 46, the spectroscope is arranged at an angle of 45 degrees with the incident light path, a protective glass plate 49 is arranged outside the spectroscope 47 and the concave reflective mirror 48, and a vision examination icon of the viewing disc 44 is imaged on the spectroscope 47 and is incident to the eyes of the examinee 2 through the protective glass plate 49. When the subject 2 is seated 1.1 m in front of the instrument, the virtual image formed by the optical system falls exactly 5m in front of his eyes. The visual inspection icons can be changed by rotating the optical disc 44, so as to achieve the purpose of inspecting the vision.

The spectroscope in the vision tester adopts the semi-transparent spectroscope, the brightness loss is half when the light transmits, the light loss is half when the light reaches the semi-transparent spectroscope after being imaged by the concave reflector and is reflected again, the image light of the tested person which is seen through the protective glass plate is weakened by more than half, the protective glass plate is dark gray, and the light intensity loss in the whole process exceeds 90 percent. Therefore, the vision tester must use a high-brightness halogen lamp or a high-power LED as a light source. The dark grey glass plate has a light transmittance of 20% and is used for preventing external light from illuminating the inside of the optometer through an observation window formed by the glass plate. The examinee sees the completely dark inner space through the dark grey protective glass and only projects the visual chart, commonly called as a dark box. The common vision tester is used in a bright room, the light environment difference inside and outside the dark box is large, the visual targets observed by the examinees are seriously influenced, the eye pupil adjusting range of the examinees is enlarged, and the optometry deviation is caused.

Disclosure of Invention

The utility model aims to solve the technical problem that an optical system of interior formula projection eyesight appearance is provided, this optical system overcomes the defect of reading formula projection eyesight appearance visual examination in the tradition, effectively improves the scene of visual examination and is shaded, avoids the great difference of the interior external light environment of camera bellows, improves the travelling comfort of examinee's eyes, ensures the accuracy of visual examination.

In order to solve the technical problem, the optical system of the inward-reading projection vision tester comprises a light source, a light homogenizing plate, a light disc, a shading disc, a planar reflector, a spectroscope, a concave reflector and a protective glass plate, wherein the light source, the light homogenizing plate, the light disc, the shading disc and the planar reflector are sequentially arranged at intervals, the light disc and the shading disc form a rotating disc through a rotating shaft and are arranged on a light path between the light homogenizing plate and the planar reflector, the planar reflector and an incident light path are arranged at an angle of 45 degrees, the spectroscope and the concave reflector are sequentially arranged on a reflected light path of the planar reflector at intervals, the spectroscope and the incident light path are arranged at an angle of 45 degrees, and the protective glass plate is arranged outside the spectroscope and the concave reflector; the optical system also comprises a backlight plate, wherein a window is arranged in the middle of the backlight plate, the backlight plate is arranged on an incident light path of the plane reflector, and the incident light path penetrates through the window.

Further, the backlight plate is an LED backlight plate, and the window size coincides with the size of the vision inspection icon projected through the optical disc.

Further, the brightness of the backlight plate is consistent with the brightness of the environment outside the internal-reading type projection vision device.

Because the utility model discloses the optical system of interior formula projection eyesight appearance has adopted above-mentioned technical scheme, light source in this optical system promptly, even slide, look the CD, the shading disk, plane reflector interval arrangement in proper order, it constitutes the carousel through the pivot to look CD and shading disk and sets up in the light path between even slide and plane reflector, plane reflector is 45 degrees angle arrangements with incident light path, spectroscope and concave surface reflector interval arrangement in proper order is in the reflected light path of plane reflector, the spectroscope is 45 degrees angle arrangements with incident light path, the outside of spectroscope and concave surface reflector is located to the protection glass board, it has the window to open at the middle part of the board of being shaded, the board of being shaded is located the incident light path of plane reflector, and incident light path passes the window. The optical system overcomes the defect of the vision inspection of the traditional internal reading type projection vision tester, effectively improves the scene backlight of the vision inspection, avoids the great difference of the light environment inside and outside the dark box, improves the comfort of the eyes of the examinee, and ensures the accuracy of the vision inspection.

Drawings

The invention will be described in further detail with reference to the following drawings and embodiments:

FIG. 1 is a diagram of a visual inspection of a traditional light box visual chart;

FIG. 2 is a schematic view of a conventional visual acuity test using a planar mirror to form a virtual image;

FIG. 3 is a schematic diagram of a vision test using a conventional internal reading type projection vision tester;

FIG. 4 is a schematic diagram of the optical system of a conventional internal reading type projection vision device;

fig. 5 is a schematic view of the optical system of the internal reading type projection vision tester of the present invention.

Detailed Description

Embodiment is as shown in fig. 5, the optical system of the inward-reading projection vision tester of the present invention includes a light source 42, a light-homogenizing sheet 43, a viewing disc 44, a shading disc 45, a plane reflective mirror 46, a beam splitter 47, a concave reflective mirror 48 and a protective glass plate 49, the light source 42, the light-homogenizing sheet 43, the viewing disc 44, the shading disc 45 and the plane reflective mirror 46 are sequentially arranged at intervals, the viewing disc 44 and the shading disc 45 constitute a rotating disc through a rotating shaft 50 and are arranged on a light path between the light-homogenizing sheet 43 and the plane reflective mirror 46, the plane reflective mirror 46 and an incident light path are arranged at an angle of 45 degrees, the beam splitter 47 and the concave reflective mirror 48 are sequentially arranged on a reflected light path of the plane reflective mirror 46 at intervals, the beam splitter 47 and the incident light path are arranged at an angle of 45 degrees, and the protective glass plate 49 is arranged outside the beam splitter 47 and the concave reflective mirror 48; the optical system further comprises a backlight plate 5, wherein a window 51 is formed in the middle of the backlight plate 5, the backlight plate 5 is arranged on an incident light path of the plane reflector 46, and the incident light path penetrates through the window 51.

Preferably, the backlight panel 5 is an LED backlight panel, and the window 51 is sized to correspond to the size of the vision inspection icon projected through the optic disk 44.

Preferably, the brightness of the backlight plate 5 is consistent with the brightness of the environment outside the internal-reading type projection vision device.

The optical system is provided with the backlight plate on the incident light path of the plane reflector, and the brightness of the backlight plate is adjusted to be close to the illumination outside the box of the internal reading type projection vision tester, namely, the backlight plate is matched with the ambient brightness, so that the eye of an examinee cannot adjust the size of the pupil of the glasses due to too large light change when the eye of the examinee observes inside and outside, the comfort level of the eye of the examinee in visual inspection is improved, the optometry precision is improved, and the requirements of national standards (GB 11533-1989) on the ambient illumination are met.

Claims

1. An optical system of an internal-reading type projection vision tester comprises a light source, a light homogenizing sheet, a visual disc, a shading disc, a planar reflector, a spectroscope, a concave reflector and a protective glass plate, wherein the light source, the light homogenizing sheet, the visual disc, the shading disc and the planar reflector are sequentially arranged at intervals; the method is characterized in that: the optical system also comprises a backlight plate, wherein a window is arranged in the middle of the backlight plate, the backlight plate is arranged on an incident light path of the plane reflector, and the incident light path penetrates through the window.

2. The optical system of an internal-reading projection vision apparatus of claim 1, wherein: the backlight plate is an LED backlight plate, and the window size is consistent with the size of the vision inspection icon projected through the optical disc.

3. The optical system of an internal-reading type projection vision equipment according to claim 1 or 2, characterized in that: the brightness of the backlight plate is consistent with the brightness of the environment outside the internal-reading type projection vision device.