CN210124755U - Light path structure of internal reading type projection vision instrument - Google Patents
Light path structure of internal reading type projection vision instrument Download PDFInfo
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- CN210124755U CN210124755U CN201920234603.6U CN201920234603U CN210124755U CN 210124755 U CN210124755 U CN 210124755U CN 201920234603 U CN201920234603 U CN 201920234603U CN 210124755 U CN210124755 U CN 210124755U
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Abstract
The utility model discloses an optical path structure of interior reading formula projection eyesight appearance, this optical path structure includes through pivot pivoted sighting mark dish, the light source, even slide, first plane reflector and concave mirror, first plane reflector slope is arranged, the sighting mark dish is located between even slide and the first plane reflector, first plane reflector top is located to the concave mirror, the light of light source throws sighting mark dish pattern to first plane reflector through even slide, first plane reflector light throws to the concave mirror, this optical path structure still includes the second plane reflector, the light path outside of first plane reflector and concave mirror is located in the slope of second plane reflector, the light of concave mirror throws to the second plane reflector, the second plane reflector throws sighting mark dish pattern to the person being examined the eye. The optical path structure overcomes the defects of the optical path system of the traditional internal reading type projection vision tester, effectively improves the light of vision inspection images, avoids light intensity loss, and reduces the energy consumption and the cost of equipment.
Description
Technical Field
The utility model relates to an optical path structure of interior formula projection eyesight appearance of reading.
Background
In general, in the case of vision examination, as shown in fig. 1, a light box eye chart 1 for vision examination is required to be hung 5m from the front of a subject 2, and therefore, a laboratory must have a considerably large area. Projection-type and liquid crystal-screen eye charts developed in recent years also require large-area optometry rooms.
In order to reduce the optometry room area, as shown in fig. 2, a plane mirror 3 may be placed 2.5m in front of the subject 2, and a light box visual chart 1 or a liquid crystal screen visual chart may be placed behind the subject 2, and the subject 2 is viewed by reflection of the plane mirror 3 to achieve the same examination effect.
However, in modern optometry rooms, various devices such as optometry machines, test strips and comprehensive optometry tables are required to be configured, and the reflected optometry chart is blocked in the process of optometry, so that the optometry is affected.
To avoid the vision obstruction, a recent inward reading type projection vision tester, as shown in fig. 3, compresses the visual chart in a box 4, and the box 4 is placed 1.1m in front of the subject 2, thereby avoiding the defects of the previous visual tests. As shown in fig. 4, a set of optical path system and a target disk 42 rotating through a rotating shaft 41 are arranged in the instrument, the optical path system comprises a light source 43, a light uniformizing sheet 44, a planar reflective mirror 45, a semi-permeable light splitter 46 and a concave reflective mirror 47, the semi-permeable light splitter 46 is arranged vertically to the planar reflective mirror 45, a protective lens 48 is arranged in front of the semi-permeable light splitter 46, wherein the planar reflective mirror 45 and the semi-permeable light splitter 46 form a certain included angle with the horizontal direction, and the target disk 42 is arranged between the light uniformizing sheet 44 and the planar reflective mirror 45; the visual target disc 42 sets up a plurality of visual inspection patterns along the circumferencial direction, light source 43 projects visual inspection pattern to planar reflector 45 through even light piece 44, planar reflector 45's light projects concave mirror 47 through semi-permeable spectroscope 46, concave mirror 47 light reflects semi-permeable spectroscope 46, when the examinee sits 1.1m department in front of the instrument, the virtual image that semi-permeable spectroscope 46 formed just falls 5m department in front of its eyes through protection lens 48, rotate visual target disc 42 and can change various different patterns, in order to reach the purpose of inspection eyesight.
This instrument is owing to adopted the semi-transparent spectroscope, luminance loss is half when the light of plane mirror passes through, light loss is half again when arriving semi-transparent spectroscope after concave reflector formation of image after the reflexion, the person of being examined sees through the image light that protective glass saw and has weakened more than half, whole process light loss exceeds 90%, consequently, this instrument must adopt the halogen lamp of hi-lite or high-power LED luminotron as the light source, from this, energy consumption and heat have been increased, or need to add heat dissipation mechanism, the energy waste, the equipment cost has been improved.
Disclosure of Invention
The utility model aims to solve the technical problem that a light path structure of interior formula projection eyesight appearance is provided, this light path structure overcomes traditional interior formula projection eyesight appearance light path system's of reading defect, effectively improves the light of visual examination image, avoids light loss, reduces equipment energy consumption and cost.
In order to solve the technical problem, the optical path structure of the inner-reading type projection eyesight instrument of the utility model comprises a visual target disc, a light source, a light homogenizing plate, a first plane reflective mirror and a concave reflective mirror which rotate through a rotating shaft, the first plane reflector is obliquely arranged, the sighting mark disc is positioned between the light homogenizing plate and the first plane reflector, the concave reflector is arranged above the first plane reflector, the light of the light source projects the visual target disc pattern to the first plane reflector through the dodging sheet, the first plane reflector projects the light to the concave reflector, the light path structure also comprises a second plane reflector, the second plane reflective mirror is obliquely arranged outside the optical paths of the first plane reflective mirror and the concave reflective mirror, the light rays of the concave reflector are projected to the second planar reflector, and the second planar reflector projects the sighting target disk pattern to the human eyes of the examinee.
Furthermore, the structure also comprises a protective lens which is arranged in front of the second plane reflector.
Further, the light source is a low-power halogen lamp or an LED light emitting tube.
Because the utility model discloses the light path structure of internal reading formula projection eyesight appearance has adopted above-mentioned technical scheme, this light path structure includes through pivot pivoted sighting target dish promptly, the light source, even slide, first plane reflector and concave mirror, first plane reflector slope is arranged, the sighting target dish is located between even slide and the first plane reflector, first plane reflector top is located to the concave mirror, the light of light source is through even slide with sighting target dish pattern throw to first plane reflector, first plane reflector light is thrown to the concave mirror, this light path structure still includes the second plane reflector, the light path outside of first plane reflector and concave mirror is located in the slope of second plane reflector, the light of concave mirror is thrown to the second plane reflector, the second plane reflector is thrown sighting target dish pattern to examinee's eyes. The optical path structure overcomes the defects of the optical path system of the traditional internal reading type projection vision tester, effectively improves the light of vision inspection images, avoids light intensity loss, and reduces the energy consumption and the cost of equipment.
Drawings
The invention will be described in further detail with reference to the following drawings and embodiments:
FIG. 1 is a schematic view of a visual acuity test using a light box visual chart;
FIG. 2 is a schematic view of a light box visual chart for reflex vision test;
FIG. 3 is a schematic view of an internal reading type projection vision tester for visual acuity test;
FIG. 4 is a schematic view of an internal optical path structure of the internal reading type projection vision device;
fig. 5 is the light path structure schematic diagram of the internal reading type projection vision tester of the present invention.
Detailed Description
As shown in fig. 5, the optical path structure of the inward-reading type projection vision device of the present invention includes a target disk 42, a light source 43, a light-homogenizing sheet 44, a first plane reflective mirror 45 and a concave reflective mirror 47, the first plane reflective mirror 45 is disposed in an inclined manner, the target disk 42 is disposed between the light-homogenizing sheet 44 and the first plane reflective mirror 45, the concave reflective mirror 47 is disposed above the first plane reflective mirror 45, the light from the light source 43 projects the target disk 42 pattern onto the first plane reflective mirror 45 via the light-homogenizing sheet 44, the light from the first plane reflective mirror 45 projects onto the concave reflective mirror 47, the optical path structure further includes a second plane reflective mirror 49, the second plane reflective mirror 49 is disposed in an inclined manner outside the optical paths of the first plane reflective mirror 45 and the concave reflective mirror 47, the light from the concave reflective mirror 47 projects onto the second plane reflective mirror 49, the second planar mirror 49 projects the reticle 42 pattern to the subject's eye.
Preferably, the structure further comprises a protective lens 48, and the protective lens 48 is arranged in front of the second plane reflective mirror 49.
Preferably, the light source 43 is a low-power halogen lamp or an LED.
The optical path structure has the same use condition as the traditional internal reading type projection vision device, and is also placed 1.1m in front of the examinee, the image formed by the device is 5m away from the examinee, but different structures are adopted on the internal optical path. This light path structure changes traditional semi-permeable spectroscope into the plane reflector, and the plane reflector translates left and dodges the light path that sighting mark dish pattern was projected to the concave mirror, and in practical application, clockwise rotation concave mirror lets sighting mark dish pattern pass through the concave mirror and projects on the plane reflector, and the inclination of fine setting plane reflector lets sighting mark dish pattern pass through the protection lens and projects people's eye, reaches visual inspection's purpose.
In the light path structure, because the light rays are directly projected, the light intensity loss is avoided, and a high-brightness halogen lamp or a high-power LED (light emitting diode) luminotron is not needed to be used as a light source, so that the light rays of the vision examination image are effectively improved, and the energy consumption and the cost of equipment are reduced.
Claims (3)
1. The utility model provides an optical path structure of interior formula projection eyesight appearance, includes through pivot pivoted sighting mark dish, light source, even slide, first plane reflector and concave reflector, first plane reflector slope is arranged, the sighting mark dish is located between even slide and the first plane reflector, the concave reflector is located first plane reflector top, the light of light source is through even slide with sighting mark dish pattern throw extremely first plane reflector, first plane reflector light throw extremely concave reflector, its characterized in that: the optical path structure further comprises a second planar reflector, the second planar reflector is obliquely arranged on the outer side of the optical path between the first planar reflector and the concave reflector, light rays of the concave reflector are projected to the second planar reflector, and the second planar reflector projects the visual target disc pattern to the eyes of the examinee.
2. The optical path structure of an internal-reading type projection vision device according to claim 1, wherein: the structure also comprises a protective lens which is arranged in front of the second plane reflector.
3. The optical path structure of an internal-reading type projection vision device according to claim 1 or 2, wherein: the light source is a low-power halogen lamp or an LED luminotron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920234603.6U CN210124755U (en) | 2019-02-25 | 2019-02-25 | Light path structure of internal reading type projection vision instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920234603.6U CN210124755U (en) | 2019-02-25 | 2019-02-25 | Light path structure of internal reading type projection vision instrument |
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| CN210124755U true CN210124755U (en) | 2020-03-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109820475A (en) * | 2019-02-25 | 2019-05-31 | 上海雄博精密仪器股份有限公司 | The light channel structure of interior reading formula projection vision tester for eyesight |
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2019
- 2019-02-25 CN CN201920234603.6U patent/CN210124755U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109820475A (en) * | 2019-02-25 | 2019-05-31 | 上海雄博精密仪器股份有限公司 | The light channel structure of interior reading formula projection vision tester for eyesight |
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