CN220232104U - High-magnification flat field sighting eyepiece - Google Patents
High-magnification flat field sighting eyepiece Download PDFInfo
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- CN220232104U CN220232104U CN202322060353.8U CN202322060353U CN220232104U CN 220232104 U CN220232104 U CN 220232104U CN 202322060353 U CN202322060353 U CN 202322060353U CN 220232104 U CN220232104 U CN 220232104U
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- 230000003287 optical effect Effects 0.000 claims abstract description 19
- 210000001747 pupil Anatomy 0.000 claims description 10
- 230000014509 gene expression Effects 0.000 claims description 4
- 238000003384 imaging method Methods 0.000 abstract description 16
- 238000002834 transmittance Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 9
- 238000001514 detection method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000001931 thermography Methods 0.000 description 2
- 102220616555 S-phase kinase-associated protein 2_E48R_mutation Human genes 0.000 description 1
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- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The utility model discloses a high-magnification flat field viewing eyepiece, which comprises a first lens with positive focal power, a second lens with negative focal power and a micro display screen, wherein the first lens, the second lens and the micro display screen are sequentially arranged along an optical axis, the first lens is a biconvex lens, the second lens is a biconcave lens, and the effective focal length of the high-magnification flat field viewing eyepiece is 13.5mm. The flat field sighting eyepiece only adopts two lenses, has 18.5 times of high magnification, light structure, high transmittance and low cost, and has imaging resolution reaching the resolution limit of human eyes, good imaging quality and wide application range.
Description
Technical Field
The utility model belongs to the technical field of optical lenses, and particularly relates to a high-magnification flat field sighting eyepiece.
Background
The infrared thermal imaging signal can not be directly observed by human eyes, and the hand-held type observation infrared thermal imager utilizes the infrared thermal imaging technology to detect infrared radiation of a target object, and adopts means such as signal processing, photoelectric conversion and the like to convert an image of temperature distribution of the target object onto a micro-display device, and then the image is amplified by an eyepiece to be observed by the human eyes.
The special micro display device on the market has less viewing eyepiece and low magnification, and if higher magnification is needed, more lenses are needed, so that the structure size is large, the weight is heavy, and the processing cost is high.
Disclosure of Invention
Aiming at the problems, the utility model provides a high-magnification flat field sighting eyepiece which has high magnification, good imaging quality, small size, light weight and low cost, can stably work in the temperature range of minus 30 ℃ to +50 ℃ and has wide application range.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
the utility model provides a high-magnification flat field viewing eyepiece, which comprises a first lens with positive focal power, a second lens with negative focal power and a micro display screen, wherein the first lens, the second lens and the micro display screen are sequentially arranged along an optical axis, the first lens is a biconvex lens, the second lens is a biconcave lens, and the effective focal length of the high-magnification flat field viewing eyepiece is 13.5mm.
Preferably, the thickness of the first lens is 4.0mm, the air space between the first lens and the second lens is 0.5mm, the thickness of the second lens is 3.1mm, and the air space between the second lens and the micro display screen is 7.5mm.
Preferably, the light incident surface of the first lens is an aspheric surface, the light emergent surface of the first lens is a spherical surface, and the light incident surface and the light emergent surface of the second lens are both aspheric surfaces.
Preferably, the radius of curvature of the light incident surface of the first lens is-8.91 mm, the radius of curvature of the light emergent surface of the first lens is 5.76mm, the radius of curvature of the light incident surface of the second lens is 279.5mm, and the radius of curvature of the light emergent surface of the second lens is-6.92 mm.
Preferably, the aspherical surface satisfies the following expression:
wherein Z (r) is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height r along the optical axis direction; c=1/R, R being the radius of curvature; k is a conic coefficient; A. b, C, D is a higher order aspheric coefficient.
Preferably, k, A, B, C, D of the light incident surface of the first lens has values of 0, 3.032E-003, -1.212E-004, 1.331E-006, and 0 in sequence, k, A, B, C, D of the light emergent surface of the second lens has values of 0, 6.190E-003, -2.899E-004, 7.594E-006, and-7.741E-008 in sequence, and k, A, B, C, D of the light incident surface of the second lens has values of 0, 4.254E-003, 8.162E-005, -1.393E-005, and 9.547E-007 in sequence.
Preferably, the magnification of the high magnification flat field viewing eyepiece is 18.5 times.
Preferably, the first lens and the second lens are both plastic lenses.
Preferably, the micro-display is an OLED micro-display.
Preferably, the exit pupil diameter of the high magnification flat field viewing eyepiece is 5.0mm and the exit pupil distance is 15mm.
Compared with the prior art, the utility model has the beneficial effects that:
only two lenses are adopted, and the reasonable use of the aspheric surface achieves the following steps: 1) The effective focal length of the ocular lens is 13.5mm, and the ocular lens has high magnification of 18.5 times; 2) The structure is light and the transmittance is high; 3) The cost is low, the two lenses are made of plastic optical materials and can be processed in an injection molding mode, and the production cost is low; 4) The imaging quality is excellent: the imaging resolution reaches the resolution limit of human eyes, and the imaging quality is good.
Drawings
FIG. 1 is a schematic view of the structure of a high magnification flat field viewing eyepiece of the present utility model;
FIG. 2 is a spot diagram of the present utility model;
FIG. 3 is a graph of MTF at room temperature (20 ℃ C.) for the present utility model;
FIG. 4 is a graph of MTF at low temperature (-30 ℃ C.) for the present utility model;
FIG. 5 is a graph of MTF at high temperature (+50℃).
Reference numerals: l1, a first lens; l2, a second lens; IM, micro display screen.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
It is noted that unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
As shown in fig. 1 to 5, the high-magnification flat field viewing eyepiece comprises a first lens L1 with positive optical power, a second lens L2 with negative optical power and a micro display screen IM which are sequentially arranged along an optical axis, wherein the first lens L1 is a biconvex lens, the second lens L2 is a biconcave lens, and the effective focal length of the high-magnification flat field viewing eyepiece is 13.5mm.
The flat field sighting eyepiece only adopts two lenses, the first lens L1 is a biconvex lens, the second lens L2 is a biconcave lens, and the effective focal length is reasonably arranged so that the structure has high magnification, and the imaging quality is ensured, and meanwhile, the miniaturization, the light weight and the low cost are realized. When the micro display screen IM works, light rays emitted by the micro display screen IM sequentially pass through the second lens L2 and the first lens L1 to reach human eyes.
In one embodiment, the thickness of the first lens L1 is 4.0mm, the air space between the first lens L1 and the second lens L2 is 0.5mm, the thickness of the second lens L2 is 3.1mm, and the air space between the second lens L2 and the micro display screen IM is 7.5mm. By reasonably setting the thickness or distance of each element, the imaging device is beneficial to realizing miniaturization and light weight, and excellent imaging quality is obtained.
In an embodiment, the light incident surface of the first lens L1 is aspheric, the light emergent surface is spherical, and the light incident surface and the light emergent surface of the second lens L2 are both aspheric. The aspherical lens can achieve clear imaging by correcting focusing of the higher order curved surface, thereby overcoming aberration and contributing to simplification of structure.
In an embodiment, the radius of curvature of the light incident surface of the first lens L1 is-8.91 mm, the radius of curvature of the light emergent surface is 5.76mm, the radius of curvature of the light incident surface of the second lens L2 is 279.5mm, and the radius of curvature of the light emergent surface is-6.92 mm.
In one embodiment, the aspherical surface satisfies the following expression:
wherein Z (r) is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height r along the optical axis direction; c=1/R, R being the radius of curvature; k is a conic coefficient; A. b, C, D is a higher order aspheric coefficient.
In an embodiment, k, A, B, C, D of the light incident surface of the first lens L1 sequentially takes values of 0, 3.032E-003, -1.212E-004, 1.331E-006 and 0, k, A, B, C, D of the light emergent surface of the second lens L2 sequentially takes values of 0, 6.190E-003, -2.899E-004, 7.594E-006 and 7.741E-008, and k, A, B, C, D of the light incident surface of the second lens L2 sequentially takes values of 0, 4.254E-003, 8.162E-005, -1.393E-005 and 9.547E-007.
In one embodiment, the high magnification flatfield viewing eyepiece has a magnification of 18.5 times.
In an embodiment, the first lens L1 and the second lens L2 are plastic lenses.
In this embodiment, the first lens L1 is made of an optical material with a model number of K26R, and the second lens L2 is made of an optical material with a model number of EP 6000. In the selection of the lens material, a plastic material is preferable, the processing is convenient, the light weight is facilitated, and the plastic material can be used in a model such as E48R and the like. In addition, glass materials can be adopted according to actual application scenes, and the models such as S-LAH55, N-SF15, M-LAC130 and the like; different lens materials can meet different requirements of the optical system.
In one embodiment, the microdisplay IM is an OLED microdisplay. Or other displays known in the art, such as LCOS displays, etc., may be used.
In one embodiment, the high magnification flatfield viewing eyepiece has an exit pupil diameter of 5.0mm and an exit pupil distance of 15mm.
The exit pupil is the diaphragm position of the high-magnification flat field sighting eyepiece, and coincides with the pupil of the human eye in use.
The flat field sighting eyepiece only adopts two lenses, and the reasonable use of the aspheric surface achieves the following steps: 1) The effective focal length of the ocular lens is 13.5mm, and the ocular lens has high magnification of 18.5 times; 2) The structure is light and the transmittance is high; 3) The cost is low, the two lenses are made of plastic optical materials and can be processed in an injection molding mode, and the production cost is low; 4) The imaging quality is excellent: the imaging resolution reaches the resolution limit of human eyes, and the imaging quality is good.
The present application is described in detail below by way of specific examples.
The optical parameters of the flatfield viewing eyepiece are shown in table 1 below.
TABLE 1
In table 1, the S0 plane is the exit pupil position (stop position) of the field observation eyepiece, S1 is the exit plane of the first lens, S2 is the entrance plane of the first lens, S3 is the exit plane of the second lens, and S4 is the entrance plane of the second lens, see fig. 1.
When the aspherical surface satisfies the above parameters, the following expressions are satisfied at the same time:
wherein Z (r) is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height r along the optical axis direction; c=1/R, R being the radius of curvature; k is a conic coefficient; A. b, C, D is a higher order aspheric coefficient.
The aspherical parameters of the lenses are shown in table 2.
TABLE 2
| Face number | k | A | B | C | D |
| S2 | 0 | 3.032E-003 | -1.212E-004 | 1.331E-006 | 0 |
| S3 | 0 | 6.190E-003 | -2.899E-004 | 7.594E-006 | -7.741E-008 |
| S4 | 0 | 4.254E-003 | 8.162E-005 | -1.393E-005 | 9.547E-007 |
According to the data, the flat field sighting eyepiece has the following optical indexes:
(1) Focal length: f=13.5 mm;
(2) Magnification ratio: 18.5 times
(3) Field angle range: 16.7 ° (H) 12.7 ° (V);
(4) Exit pupil diameter: 5.0mm;
(5) OLED screen resolution: 720 (H) 540 (V);
(6) Pixel size: 5.5 μm by 5.5 μm;
(7) Operating temperature: -30 to +50 ℃;
the flat field sighting eyepiece is used as a test object for detection, and the conventional step of lens detection is adopted in the test step, so that repeated description is omitted. The detection results are shown below:
as shown in FIG. 2, the Root Mean Square (RMS) value of the ocular spot is not more than 6.6 μm, which meets the imaging requirements.
As shown in FIGS. 3, 4 and 5, the eyepiece has excellent imaging quality at a characteristic frequency (60 lp/mm) at room temperature (20 ℃), low temperature (-30 ℃) and high temperature (50 ℃) MTF of more than 0.2.
The optical index and the test result can be obtained, and the flat field sighting eyepiece provided by the embodiment adopts only two lenses, so that the eyepiece has compact and light structural appearance, high transmittance and low cost, and the imaging quality is excellent in the working temperature range of minus 30 ℃ to plus 50 ℃ by reasonably selecting the aspheric surface position.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above-described embodiments are merely representative of the more specific and detailed embodiments described herein and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (10)
1. A high-magnification flat field sighting eyepiece is characterized in that: the high-magnification flat field sighting eyepiece comprises a first lens (L1) with positive focal power, a second lens (L2) with negative focal power and a micro display screen (IM) which are sequentially arranged along an optical axis, wherein the first lens (L1) is a biconvex lens, the second lens (L2) is a biconcave lens, and the effective focal length of the high-magnification flat field sighting eyepiece is 13.5mm.
2. The high magnification flat field viewing eyepiece of claim 1 wherein: the thickness of the first lens (L1) is 4.0mm, the air interval between the first lens (L1) and the second lens (L2) is 0.5mm, the thickness of the second lens (L2) is 3.1mm, and the air interval between the second lens (L2) and the micro display screen (IM) is 7.5mm.
3. The high magnification flat field viewing eyepiece of claim 1 wherein: the light incident surface of the first lens (L1) is an aspheric surface, the light emergent surface is a spherical surface, and the light incident surface and the light emergent surface of the second lens (L2) are both aspheric surfaces.
4. A high magnification flat field viewing eyepiece as recited in claim 3 wherein: the curvature radius of the light incident surface of the first lens (L1) is-8.91 mm, the curvature radius of the light emergent surface of the first lens is 5.76mm, the curvature radius of the light incident surface of the second lens (L2) is 279.5mm, and the curvature radius of the light emergent surface of the second lens is-6.92 mm.
5. The high magnification flat field viewing eyepiece of claim 4 wherein: the aspherical surface satisfies the following expression:
wherein Z (r) is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height r along the optical axis direction; c=1/R, R being the radius of curvature; k is a conic coefficient; A. b, C, D is a higher order aspheric coefficient.
6. The high magnification flat field viewing eyepiece of claim 5 wherein: the k, A, B, C, D values of the light incident surface of the first lens (L1) are 0, 3.032E-003, -1.212E-004, 1.331E-006 and 0 in sequence, the k, A, B, C, D values of the light emergent surface of the second lens (L2) are 0, 6.190E-003, -2.899E-004, 7.594E-006 and-7.741E-008 in sequence, and the k, A, B, C, D values of the light incident surface of the second lens (L2) are 0, 4.254E-003, 8.162E-005, -1.393E-005 and 9.547E-007 in sequence.
7. The high magnification flat field viewing eyepiece of claim 1 wherein: the magnification of the high-magnification flat field sighting eyepiece is 18.5 times.
8. The high magnification flat field viewing eyepiece of claim 1 wherein: the first lens (L1) and the second lens (L2) are plastic lenses.
9. The high magnification flat field viewing eyepiece of claim 1 wherein: the micro display screen (IM) is an OLED micro display screen.
10. The high magnification flat field viewing eyepiece of claim 1 wherein: the exit pupil diameter of the high-magnification flat field sighting eyepiece is 5.0mm, and the exit pupil distance is 15mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322060353.8U CN220232104U (en) | 2023-08-02 | 2023-08-02 | High-magnification flat field sighting eyepiece |
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| CN202322060353.8U CN220232104U (en) | 2023-08-02 | 2023-08-02 | High-magnification flat field sighting eyepiece |
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| CN220232104U true CN220232104U (en) | 2023-12-22 |
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| CN202322060353.8U Active CN220232104U (en) | 2023-08-02 | 2023-08-02 | High-magnification flat field sighting eyepiece |
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