CN220109716U - Optical system for refractive topographic map - Google Patents
Optical system for refractive topographic map Download PDFInfo
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- CN220109716U CN220109716U CN202321655674.6U CN202321655674U CN220109716U CN 220109716 U CN220109716 U CN 220109716U CN 202321655674 U CN202321655674 U CN 202321655674U CN 220109716 U CN220109716 U CN 220109716U
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- 230000003287 optical effect Effects 0.000 title claims abstract description 45
- 238000003384 imaging method Methods 0.000 claims abstract description 60
- 238000005286 illumination Methods 0.000 claims abstract description 35
- 230000008878 coupling Effects 0.000 claims abstract description 4
- 238000010168 coupling process Methods 0.000 claims abstract description 4
- 238000005859 coupling reaction Methods 0.000 claims abstract description 4
- 210000001747 pupil Anatomy 0.000 claims description 19
- 238000012876 topography Methods 0.000 claims description 17
- 206010027146 Melanoderma Diseases 0.000 claims description 5
- 239000013078 crystal Substances 0.000 claims description 5
- 239000010453 quartz Substances 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 238000002834 transmittance Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 8
- 210000001525 retina Anatomy 0.000 description 11
- 238000013507 mapping Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 206010020675 Hypermetropia Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 210000004087 cornea Anatomy 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 208000030533 eye disease Diseases 0.000 description 1
- 230000004438 eyesight Effects 0.000 description 1
- 230000004305 hyperopia Effects 0.000 description 1
- 201000006318 hyperopia Diseases 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 208000001491 myopia Diseases 0.000 description 1
- 230000004379 myopia Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Abstract
The utility model discloses a refractive topographic optical system, comprising: the imaging optical path component is adjustable in imaging focal length; the illumination light path component comprises a light source, a light homogenizing rod and a condensing lens group; the light homogenizing rod is used for homogenizing the emergent light of the light source, and the collecting lens group is used for receiving the emergent light of the light homogenizing rod; and the light combining component is used for coupling the emergent light path of the illumination light path with the imaging light path of the imaging light path component. According to the technical scheme, the illumination effect of the refraction topographic map optical system can be improved.
Description
Technical Field
The utility model relates to the technical field of refraction measurement, in particular to a refraction topographic map optical system.
Background
The refractive topographic map can reflect the defocus degree of different positions of the retina, and the measurement of the refractive topographic map plays an important role in analysis and prevention of eye diseases such as myopia or hyperopia. When the refraction topographic map is manufactured, firstly, good illumination is required to be carried out on the retina, so that the positions of different depths of the retina are focused through the camera system, and the refraction topographic map can be formed by analyzing the definition of the retina image. However, the existing illumination system of the refraction topographic map optical system is only formed by adopting a light source and a lens group, and good illumination is difficult to realize, so that the resolution analysis precision of pictures is lower, and the accuracy of the refraction topographic map is poorer. In order to improve the mapping accuracy of the refractive topographic optical system, a refractive topographic optical system with better illumination effect is required.
Disclosure of Invention
The utility model mainly aims to provide a refraction topographic optical system, aiming at improving the illumination effect of the refraction topographic optical system.
To achieve the above object, the present utility model provides a refractive topography optical system comprising:
the imaging optical path component is adjustable in imaging focal length;
the illumination light path component comprises a light source, a light homogenizing rod and a condensing lens group; the light homogenizing rod is used for homogenizing the emergent light of the light source, and the collecting lens group is used for receiving the emergent light of the light homogenizing rod;
and the light combining component is used for coupling the emergent light path of the illumination light path with the imaging light path of the imaging light path component.
Optionally, the light emitting surface of the light homogenizing rod is configured as a frosted surface; and/or
The material of the light homogenizing rod is configured as quartz crystal; and/or
The incidence surface of the light homogenizing rod is configured as a polished surface; and/or
The condensing lens group comprises a first condensing lens group and a second condensing lens group, and a black spot sheet is arranged between the first condensing lens group and the second condensing lens group.
Optionally, the light combining component comprises a hollow reflecting mirror; the imaging light path component images through the through hole of the hollow reflector; the illumination light path component is coupled with an imaging light path of the imaging light path component after being reflected by a reflecting surface of the hollow reflecting mirror.
Optionally, the light combining component further comprises a large objective lens group, and the large objective lens group is arranged on the light emitting side of the reflected light of the hollow reflector; and/or
The refractive topography optical system further comprises a pupil camera for taking pupil images of the subject.
Optionally, the illumination light path assembly further comprises an annular diaphragm, and the annular diaphragm is arranged between the light homogenizing rod and the condenser lens group.
Optionally, the position of the annular diaphragm is adjustable.
Optionally, the imaging light path component comprises a fixation light path component, a photosensitive light path component, a scanning mirror group and a light combiner; the light paths of the fixation light path component and the photosensitive light path component are coupled after passing through a light combiner; the scanning mirror group is arranged at one side of the light combiner, which emits the light emitted by the fixation light path component; the fixation light path component is used for projecting fixation light; the photosensitive light path component comprises an image collector, wherein the image collector is used for collecting images; the focal length of the scanning mirror group is adjustable.
Optionally, the fixation light path component includes a projection lens group and a fixation cursor, where the projection lens group is used to project the fixation cursor into the combiner; and/or
The photosensitive light path component further comprises an imaging lens group, and the imaging lens group is arranged on the light inlet side of the image collector; and/or
The light combiner is configured as a beam splitting prism, and the transmittance of the beam splitting prism is greater than the reflectance.
Optionally, the imaging light path component further comprises a zeroing lens group; the zeroing lens group is used for receiving emergent light of the scanning lens group.
Optionally, the imaging light path component further includes a mirror, and the mirror is configured to receive the outgoing light of the scanning mirror set and reflect the outgoing light into the zeroing mirror set.
In the technical scheme of the utility model, after a light source of an illumination light path emits light, the light is firstly incident into a light homogenizing rod; in the light homogenizing rod, light emitted by the light source is totally reflected for many times in the light homogenizing rod, so that the light becomes uniform light beam to be emitted. The uniform light emitted by the light homogenizing rod is converged by the converging lens group and irradiates towards the retina through the pupil of the human eye. This makes the illumination brightness to the retina more uniform. If the illumination brightness of the retina is uneven, the resolution of the retina image may be analyzed, and the resolution judgment may be inaccurate due to the influence of the uneven brightness of each position of the image. Therefore, the technical scheme of the utility model improves the definition of illumination, namely improves the illumination effect.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a refractive topography optical system according to an embodiment of the present utility model;
reference numerals illustrate:
| reference numerals | Name of the name | Reference numerals | Name of the name |
| 11 | Hollow reflector | 40 | Light splitting prism |
| 12 | Large objective lens group | 51 | Image collector |
| 21 | Light source | 52 | Imaging lens assembly |
| 22 | Uniform light bar | 61 | Lens group |
| 23 | First condenser group | 62 | Fixation cursor |
| 24 | Second condenser lens group | 70 | Zero-setting lens group |
| 25 | Black spot sheet | 80 | Scanning mirror group |
| 26 | Annular diaphragm | 90 | Reflecting mirror |
| 30 | Pupil camera |
The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.
The utility model provides a refractive topographic optical system.
In an embodiment of the present utility model, referring to fig. 1, the refractive topography optical system comprises:
the imaging optical path component is adjustable in imaging focal length;
the illumination light path component comprises a light source 21, a light homogenizing rod 22 and a condensing lens group; the light homogenizing rod 22 is used for homogenizing the emergent light of the light source 21, and the condensing lens group is used for receiving the emergent light of the light homogenizing rod 22;
and the light combining component is used for coupling the emergent light path of the illumination light path with the imaging light path of the imaging light path component.
In order to ensure good illumination, the illumination direction of the illumination light path to the retina is preferably the same as the shooting direction of the imaging light path component, and therefore, a light combination component is used, and the light combination component can be a beam splitter prism; when the beam splitting prism is used conventionally, the beam splitting function is achieved, namely the incident light can be split into two beams, but when the two beams of light are respectively incident into the beam splitting prism from the directions of the two emergent light, one beam of light of the combined beam can be obtained.
Referring to fig. 1, optionally, the light emitting surface of the light homogenizing rod 22 is configured as a frosted surface; and/or
The material of the light homogenizing rod 22 is configured as quartz crystal; and/or
The incident surface of the light homogenizing rod 22 is configured as a polished surface; and/or
The condenser lens group includes a first condenser lens group 23 and a second condenser lens group 24, and a black spot sheet 25 is provided between the first condenser lens group 23 and the second condenser lens group 24.
The light emergent surface of the light homogenizing rod 22 is a frosted surface, so that the light emergent intensity of the light homogenizing rod 22 can be further uniform. Since the incident light of the light homogenizing rod 22 needs to be totally reflected for many times in the light homogenizing rod 22, the light homogenizing rod 22 is configured such that the quartz crystal has a proper refractive index on one hand, so that light with a larger incident angle can be totally reflected; on the other hand, the quartz crystal has weaker dissipation effect on light, and can avoid light energy loss. The incident surface of the light homogenizing rod 22 is a polished surface, which is beneficial to making more light incident on the light homogenizing rod 22 and avoiding the loss caused by diffuse reflection. The black spot sheet 25 is arranged between the first condenser lens group 23 and the second condenser lens group 24, so that illumination reflection can be shielded, and imaging quality is improved.
Referring to fig. 1, the light combining assembly optionally includes a hollow mirror 11; the imaging light path component images through the through hole of the hollow reflecting mirror 11; the illumination light path assembly is coupled with an imaging light path of the imaging light path assembly after being reflected by a reflecting surface of the hollow reflecting mirror 11. As shown in fig. 1, the hollow mirror 11 has little disturbance to the imaging light path because light for imaging is directly incident on the image pickup 51 through the through hole in the middle of the hollow mirror 11, which can improve imaging quality. At the same time, the reflectivity of the hollow reflecting mirror 11 for illumination light is higher, so that the light energy utilization rate can be improved.
Referring to fig. 1, optionally, the light combining assembly further includes a large objective lens group 12, the large objective lens group 12 being disposed on the light emitting side of the reflected light of the hollow reflecting mirror 11; and/or
The refractive topography optical system further comprises a pupil camera 30, the pupil camera 30 being adapted to take pupil images of the subject.
The large objective lens group 12 may assist in shaping the illumination light so that the illumination spot better fits the pupil of the human eye and better illuminates the retina. Pupil camera 30 may acquire pupil images and use a vision scheme to confirm that the pupil is in the proper position to begin the refractive topography mapping. The pupil cameras 30 may be provided in plural, and in particular, two pupil cameras 30 may be provided to confirm pupil positions from different angles, thereby improving confirmation accuracy.
Referring to fig. 1, optionally, the illumination light path assembly further includes an annular diaphragm 26, the annular diaphragm 26 being disposed between the light rod 22 and the collection optics group. When the light combining component adopts the hollow reflecting mirror 11, the hollow reflecting mirror 11 is hollow, so that the hollow reflecting mirror is more suitable for reflecting hollow light beams, otherwise, part of light directly exits through a through hole in the middle of the hollow reflecting mirror 11, the annular diaphragm 26 shapes the exiting light of the light homogenizing rod 22 into an annular shape, and thus the hollow reflecting mirror 11 can completely reflect annular light spots, and the light spots are prevented from being irradiated into pupils in an irregular shape, so that the lighting effect is improved. In addition, the light source 21 can adopt LED lamp panels arranged in an array, so that the illumination brightness is improved, and the energy consumption is reduced. The annular light spot formed by the annular diaphragm 26 also prevents the central portion of the cornea from reflecting into the imaging system, thereby improving imaging quality.
Referring to fig. 1, the position of annular diaphragm 26 is optionally adjustable. When the dioptric topography optical system is in use, the annular diaphragm 26 and the pupil of the human eye are in a conjugate position, so that the optimal illumination effect can be achieved; the annular stop 26 is adjustable in position so that the refractive topography optical system can be adapted to different subjects. The method for adjusting the annular diaphragm 26 can be to adjust the position of the diaphragm relative to the devices such as the dodging rod 22, which requires that the light emitting area of the dodging rod 22 is larger than the circumscribed circle area of the annular diaphragm 26; the method of adjusting the position of annular stop 26 may also be to adjust the position of the entire illumination path assembly as compared to the imaging path assembly; the position of annular stop 26 may also be adjusted by fixing the pupil position of the subject at different positions to accommodate the position of annular stop 26.
Referring to fig. 1, optionally, the imaging light path assembly includes a fixation light path assembly, a photosensitive light path assembly, a scanning mirror assembly 80, and a combiner; the light paths of the fixation light path component and the light-sensitive light path component are coupled after passing through the light combiner; the scanning mirror group 80 is arranged at one side of the light emitted by the light-combining device emergent fixation light path component; the fixation light path component is used for projecting fixation light; the photosensitive light path component comprises an image collector 51, and the image collector 51 is used for collecting images; the focal length of the scan mirror assembly 80 is adjustable.
The fixation light path component emits fixation light which can be perceived by human eyes, so that the human eyes are guided to keep gazing directions, and the calculation of the refraction topographic map is facilitated. The fixation light can be light with scene information or can be simple geometric figure. The emergent light of the fixation light path component and the imaging light path of the photosensitive light path need to be coupled, so that the fixation light projected by the fixation light path component can guide the human eyes to look ahead, and the mapping of the refraction topographic map is facilitated. The light combiner can also adopt a hollow reflector, so that the fixation light can be an annular light spot, and the fixation light is coupled with an imaging light path of the photosensitive light path component after being reflected by the hollow reflector. The image pickup device 51 may be a photosensitive element such as CMOS or CCD, and may be used to pick up an image. The scanning mirror group 80 may be a lens group having at least two convex lenses, the imaging focal length being changed by changing the distance between the two convex lenses; the scanning mirror assembly 80 may be provided with only one lens, and the imaging focal length may be changed by moving back and forth in the optical axis direction (the direction indicated by the arrow at the side of the scanning mirror assembly 80 as shown in fig. 1); of course, when the scanning mirror assembly 80 is composed of a plurality of lenses, the imaging focal length can also be changed by moving back and forth.
Referring to fig. 1, optionally, the fixation optical path assembly includes a projection lens set 61 and a fixation cursor 62, where the projection lens set 61 is used to project the fixation cursor 62 into the combiner; and/or
The photosensitive light path component further comprises an imaging lens group 52, and the imaging lens group 52 is arranged on the light inlet side of the image collector 51; and/or
The light combiner is configured as a light-splitting prism 40, and the transmittance of the light-splitting prism 40 is greater than the reflectance.
The lens group 61 can assist the fixation cursor 62 to image at the retina of human eyes, and improves the projection effect of the fixation cursor 62. The fixation cursor 62 may be a self-luminous cursor, such as a cursor composed of an LED array, or a common fluorescent lamp forms a cursor with the cooperation of a light-transmitting plate having a geometric figure; alternatively, the fixation cursor 62 may be a device that does not emit light but has a high reflectance, and provides fixation light by reflecting light.
Imaging optics 52 may assist in imaging at image collector 51 to improve imaging quality.
The light-splitting prism 40 has a structure in which a light-splitting film is interposed between prisms, and thus the transmittance and reflectance can be adjusted. In particular, the transmittance is made larger than the reflectance because the transmitted light is used for imaging, and should have higher brightness; the reflected light is used to project the fixation cursor 62 and should have a low brightness to avoid burning the human eye.
Referring to fig. 1, the imaging optical path assembly optionally further includes a zeroing lens set 70; the zeroing lens set 70 is used for receiving the emergent light of the scanning lens set 80.
The zeroing lens set 70 can be fine-tuned back and forth along the optical axis to adjust the optical power of the imaging optical path to an initial zero position for facilitating scanning by the subsequent scanning lens set 80.
Referring to fig. 1, the imaging optics assembly optionally further includes a mirror 90, the mirror 90 being configured to receive the outgoing light from the scanning mirror assembly 80 and reflect the outgoing light into the zeroing mirror assembly 70.
The reflecting mirror 90 can change the distribution form of the light path, so as to be convenient for adapting to the actual use scene.
In the technical solution of the present utility model, the large objective lens group 12, the first condensing lens group 23, the second condensing lens group 24, the imaging lens group 52, the light projecting lens group 61, the zeroing lens group 70 and the scanning lens group 80 may be single lenses or lens groups composed of a plurality of lenses; thus, in fig. 1, the lens groups are each shown as only one lens, but the lens groups are not limited to only one lens.
The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the utility model.
Claims (10)
1. A refractive topographical optical system, comprising:
the imaging optical path component is adjustable in imaging focal length;
the illumination light path component comprises a light source, a light homogenizing rod and a condensing lens group; the light homogenizing rod is used for homogenizing the emergent light of the light source, and the collecting lens group is used for receiving the emergent light of the light homogenizing rod;
and the light combining component is used for coupling the emergent light path of the illumination light path with the imaging light path of the imaging light path component.
2. The refractive topographical optical system of claim 1, wherein the light exit surface of the light homogenizing rod is configured as a frosted surface; and/or
The material of the light homogenizing rod is configured as quartz crystal; and/or
The incidence surface of the light homogenizing rod is configured as a polished surface; and/or
The condensing lens group comprises a first condensing lens group and a second condensing lens group, and a black spot sheet is arranged between the first condensing lens group and the second condensing lens group.
3. The refractive topography optical system of claim 1, wherein the light combining assembly comprises a hollow mirror; the imaging light path component images through the through hole of the hollow reflector; the illumination light path component is coupled with an imaging light path of the imaging light path component after being reflected by a reflecting surface of the hollow reflecting mirror.
4. A refractive topography optical system according to claim 3, wherein the light combining assembly further comprises a large objective lens group disposed on a light exit side of the reflected light of the hollow mirror; and/or
The refractive topography optical system further comprises a pupil camera for taking pupil images of the subject.
5. The refractive topography optical system of claim 3, wherein the illumination light path assembly further comprises an annular stop disposed between the homogenizing rod and the collection optic.
6. The refractive topography optical system according to claim 5, wherein a position of the annular stop is adjustable.
7. The refractive topography optical system of claim 1, wherein the imaging optical path assembly comprises a fixation optical path assembly, a photosensitive optical path assembly, a scanning mirror assembly, and a combiner; the light paths of the fixation light path component and the photosensitive light path component are coupled after passing through a light combiner; the scanning mirror group is arranged at one side of the light combiner, which emits the light emitted by the fixation light path component; the fixation light path component is used for projecting fixation light; the photosensitive light path component comprises an image collector, wherein the image collector is used for collecting images; the focal length of the scanning mirror group is adjustable.
8. The refractive topography optical system of claim 7, wherein the fixation optical path assembly comprises a projection lens set and a fixation cursor, the projection lens set being configured to project the fixation cursor into the combiner; and/or
The photosensitive light path component further comprises an imaging lens group, and the imaging lens group is arranged on the light inlet side of the image collector; and/or
The light combiner is configured as a beam splitting prism, and the transmittance of the beam splitting prism is greater than the reflectance.
9. The refractive topography optical system of claim 7, wherein the imaging optical path assembly further comprises a zeroing lens set; the zeroing lens group is used for receiving emergent light of the scanning lens group.
10. The refractive topography optical system of claim 9, wherein the imaging optical path assembly further comprises a mirror for receiving the outgoing light from the scanning mirror set and reflecting into the zeroing mirror set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321655674.6U CN220109716U (en) | 2023-06-27 | 2023-06-27 | Optical system for refractive topographic map |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321655674.6U CN220109716U (en) | 2023-06-27 | 2023-06-27 | Optical system for refractive topographic map |
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| CN220109716U true CN220109716U (en) | 2023-12-01 |
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| CN202321655674.6U Active CN220109716U (en) | 2023-06-27 | 2023-06-27 | Optical system for refractive topographic map |
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- 2023-06-27 CN CN202321655674.6U patent/CN220109716U/en active Active
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