CN217040091U - Visual chart display device - Google Patents
Visual chart display device Download PDFInfo
- Publication number
- CN217040091U CN217040091U CN202123357100.4U CN202123357100U CN217040091U CN 217040091 U CN217040091 U CN 217040091U CN 202123357100 U CN202123357100 U CN 202123357100U CN 217040091 U CN217040091 U CN 217040091U
- Authority
- CN
- China
- Prior art keywords
- light source
- frame
- chart display
- visual chart
- visual
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Eye Examination Apparatus (AREA)
Abstract
The utility model relates to an eye chart display device, include: the first visual chart display light source and the second visual chart display light source are respectively arranged on the reflection side and the transmission side of the semi-reflection mirror, thereby respectively transmitting or reflecting to the reflection mirror group, and then are projected to the color filter through the lens for imaging. The utility model discloses an eye chart display device can form the light path that satisfies detection distance through eye chart optical system to reduce the actual shared spatial distance in the visual acuity test, for current eye chart projecting apparatus, electron visual acuity test chart, have the advantage of being convenient for carry out the visual acuity test.
Description
Technical Field
The utility model relates to an eye chart display device.
Background
The prior visual chart display device generally projects visual chart images on a curtain or a wall surface for display, and because a specified distance exists between a detected person and the visual chart in visual detection, the display device needs to adjust the size of the influence projected by the display device when in setting, and because the heights of the observers are different, the height of the images needs to be adjusted when in detection every time, and the display device is very inconvenient to adjust in the detection process.
SUMMERY OF THE UTILITY MODEL
A primary object of the present invention is to provide an eye chart display device convenient for visual acuity test.
In order to achieve the above object, the present invention provides an eye chart display device, including:
the first eye chart displays a light source,
the second eye chart displays a light source,
an optical system of an eye chart comprises a half mirror, a reflector group and a lens,
a color filter for filtering out light emitted from the light source,
the first visual chart display light source and the second visual chart display light source are respectively arranged on the reflection side and the transmission side of the half-reflecting mirror so as to respectively transmit or reflect to the reflecting mirror group, and then project to the color filter through the lens for imaging.
In some embodiments of the present invention, the mirror group includes two mirrors, and the visual chart display device is focused by the imaging lens after being refracted twice.
The utility model discloses an in some embodiments, still include the swing frame, be used for fixing first visual chart show light source, second visual chart show light source and visual chart optical system to can pivot holistic swing first visual chart show light source, second visual chart show light source and visual chart optical system.
In some embodiments of the present invention, the swing frame comprises:
the first frame is used for fixing the first visual chart display light source, the second visual chart display light source and the visual chart optical system and is provided with a thrust fulcrum,
a second frame, the first frame is rotatably arranged on the second frame,
and the thrust mechanism pushes the thrust fulcrum to drive the first frame to swing relative to the second frame.
In some embodiments of the present invention, the thrust fulcrum is a slot, the thrust mechanism includes an electric screw rod and a fastener cooperating with the slot, the screw rod drives the fastener to move, so as to push the first frame from the slot position to swing.
In some embodiments of the present invention, the second frame has a horizontal rotation axis, the first frame has a shaft hole matched with the rotation axis, and the first frame is arranged on the rotation axis of the second frame through the shaft hole sleeve for performing the rotation.
In some embodiments of the present invention, the second frame and the first frame are connected by a hinge.
The utility model discloses a visual chart display device can form the light path that satisfies detection distance through visual chart optical system to reduce the actual shared space distance in the visual acuity test, for current visual chart projector, electron visual chart, have the advantage of being convenient for carry out the visual acuity test.
Drawings
Fig. 1 shows an optical diagram of an eye chart display device.
Fig. 2 is an external structure diagram of the visual chart display device.
Fig. 3 is a schematic view of a swing frame structure in the eye chart display device of fig. 2.
Fig. 4 is a schematic cross-sectional view of the eye chart display device of fig. 2.
Fig. 5 is a mechanism diagram of the thrust mechanism 240.
Detailed Description
The visual chart projector has the advantages that under the condition that the adopted visual chart projector is used for vision detection, a long distance is required between a person and the formed visual chart, and the occupied space is large. The utility model provides a visual chart display device has mainly included first visual chart display light source, second visual chart display light source, visual chart optical system wherein, including half mirror, speculum group, lens, color filter, first visual chart display light source, second visual chart display light source are thereby set up respectively in the reflection side of half mirror and see through the side see through respectively or through reflection to speculum group, and formation of image on rethread lens throws to color filter. In the structure, the optical path constructed by the optical system of the visual chart converts the space distance occupied by detection into the optical path length inside the visual chart display device, and the visual chart is finally imaged on the color filter, so that the problem of large occupied space is reduced. The imaging principle is more similar to liquid crystal display imaging, and compared with projection, the imaging principle is clearer and more natural.
The present invention will be further described with reference to the following examples.
Fig. 1 shows a process in which the first chart light source L1 and the second chart light source L2 pass through an optical path provided by the chart optical system and then are projected on the color filter for imaging. In this eye chart display device, backlight liquid crystal light sources are used for both the first eye chart light source L1 and the second eye chart light source L2. The imaging principles of backlight liquid crystal light sources are clear to the art, where the backlight impinges light on an energized liquid crystal layer through a first layer of polarizer and through a second layer of polarizer to ultimately image onto a color filter. The difference with the prior art is that after light passes through the second layer of polarizing plate, the light firstly passes through a light path formed by the visual chart optical system, is focused by a lens and then is projected onto a color filter for imaging. This is to convert the detection distance to be spaced between the person and the visual chart at the time of the original detection into the optical path length inside the visual chart display device. Thereby shortening the space occupied during detection.
The first visual chart display light source, the second visual chart display light source and the visual chart optical system are all fixed in a swing frame. The structure of the swing frame can refer to fig. 3, which includes a first frame 210 and a second frame 220, the first frame 210 and the second frame 220 are connected by a shaft 230, the first frame 210 has a thrust fulcrum, and the thrust fulcrum is pushed by a thrust mechanism 240 to drive the first frame 210 to swing relative to the second frame 220. In the visual chart display device, a visual chart storage device and a control system can be further arranged, and the control system can send the stored visual chart to the first visual chart display light source and the second visual chart display light source for displaying.
Referring to fig. 4, the arrangement of the first chart display light source L1, the second chart display light source L2, and the chart optical system 100 in the first frame 210 is the same as that in fig. 1. With the swinging of the first frame 210, the angles of the light rays projected on the color filter F by the first and second visual chart display light sources L1 and L2 may change, so that the image of the visual chart may be properly adjusted, and the visual target in the visual chart may be kept straight.
Referring to fig. 4 and 5, the thrust support 221 in this embodiment is a slot, and the thrust mechanism 240 includes an electric screw rod and a fastener 245 matching with the slot, the screw rod drives the fastener 245 to translate, so as to push the first frame 220 from the position of the thrust support 221 to perform the swing. The structure of the electric lead screw can refer to fig. 5, and includes a stepping motor 241, a lead screw mechanism 242, a guide rod 243, and a slider 244, wherein the stepping motor 241 drives the lead screw mechanism 242 to rotate, and a sliding nut on the lead screw mechanism is fixedly connected with the slider 244. The fastener 245 is fixed on the slider 244, and when the stepping motor is started, the slider can be driven to slide along the axial direction, so that the first frame 210 is further driven to swing relative to the second frame 220 by the linkage of the fastener 245 and the fastening groove 221.
When carrying out visual acuity test, the cooperation of the first visual chart light source of accessible and second visual chart light source to switch the sighting mark of different project types respectively, or carry out the measuring of different projects to controlling the eye, image after turning into inside light path length with the detection distance through visual chart optical system, greatly reduced actual visual acuity test required spatial distance.
The embodiments of the present invention are only used for illustration, and do not limit the scope of the claims, and other substantially equivalent alternatives that may be conceived by those skilled in the art are within the scope of the present invention.
Claims (6)
1. An eye chart display apparatus characterized by comprising:
the first eye chart displays a light source,
the second eye chart displays a light source that,
an optical system of an eye chart comprises a half mirror, a reflector group and a lens,
a color filter, a light-emitting element,
the first visual chart display light source and the second visual chart display light source are respectively arranged on the reflection side and the transmission side of the half mirror so as to respectively transmit or reflect to the reflector group, and then are projected to the color filter through the lens to form images.
2. The apparatus of claim 1 wherein the mirror array comprises two mirrors, and wherein the apparatus is focused by the imaging lens after two refractions.
3. The apparatus according to claim 1, further comprising a swing frame for holding the first visual chart display light source, the second visual chart display light source and the visual chart optical system and swinging the first visual chart display light source, the second visual chart display light source and the visual chart optical system integrally around the shaft.
4. The eye chart display apparatus of claim 3 wherein said swing frame comprises:
the first frame is used for fixing the first visual chart display light source, the second visual chart display light source and the visual chart optical system and is provided with a thrust fulcrum,
a second frame, the first frame is rotatably arranged on the second frame,
and the thrust mechanism pushes the thrust fulcrum to drive the first frame to swing relative to the second frame.
5. The apparatus according to claim 4 wherein the pushing fulcrum is a slot, and the pushing mechanism comprises an electric screw and a fastener engaged with the slot, the screw driving the fastener to translate to push the first frame from the slot position to perform the swing motion.
6. The eye chart display apparatus of claim 4 wherein said second frame is coupled to said first frame by a hinge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123357100.4U CN217040091U (en) | 2021-12-29 | 2021-12-29 | Visual chart display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123357100.4U CN217040091U (en) | 2021-12-29 | 2021-12-29 | Visual chart display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217040091U true CN217040091U (en) | 2022-07-26 |
Family
ID=82480052
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123357100.4U Active CN217040091U (en) | 2021-12-29 | 2021-12-29 | Visual chart display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217040091U (en) |
-
2021
- 2021-12-29 CN CN202123357100.4U patent/CN217040091U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11762169B2 (en) | Optical device alignment methods | |
| US5444504A (en) | Optometric apparatus | |
| EP2728370A2 (en) | MRI apparatus with a display unit | |
| CN209765249U (en) | Projection device | |
| CN203709995U (en) | Auto-focusing compensation device | |
| US20100110166A1 (en) | Projecting system capable of forming 3d images and related method | |
| CN217040091U (en) | Visual chart display device | |
| US7458692B2 (en) | Projector apparatus | |
| CN112799275B (en) | Focusing method and focusing system of ultra-short-focus projection lens and projector | |
| US7312923B2 (en) | View field frame position adjustable optical device | |
| US2256397A (en) | Projection printer | |
| JP3198630B2 (en) | projector | |
| US5666611A (en) | Image scanner with one lighting unit and one drive system for scanning either reflective or transparent objects | |
| CN109188843A (en) | It is a kind of can auto-focusing ultrashort out-of-focus projection's device and method thereof | |
| CN211652027U (en) | Device for effectively measuring virtual image distance of Combiner in HUD | |
| JP3199048B2 (en) | projector | |
| CN213934510U (en) | Image acquisition device for optical machine detection | |
| CN220001729U (en) | Single-camera pupil shooting device | |
| JP2009207571A (en) | Visual target presentation apparatus | |
| CN220858204U (en) | Automatic focusing and trapezoid correction system based on LCD projector | |
| CN220509217U (en) | Head-up display and car | |
| CN220708693U (en) | Testing device of intelligent glasses | |
| CN213659802U (en) | Physical optics teaching demonstration system | |
| US3436147A (en) | Camera exposure control arrangements | |
| US4786972A (en) | CRT photography apparatus utilizing rotatable lens |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |