CN110262000A - A kind of miniaturization focal length fog penetration lens and optoelectronic device - Google Patents
A kind of miniaturization focal length fog penetration lens and optoelectronic device Download PDFInfo
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- CN110262000A CN110262000A CN201910574411.4A CN201910574411A CN110262000A CN 110262000 A CN110262000 A CN 110262000A CN 201910574411 A CN201910574411 A CN 201910574411A CN 110262000 A CN110262000 A CN 110262000A
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- 230000005693 optoelectronics Effects 0.000 title abstract description 5
- 230000035515 penetration Effects 0.000 title abstract 2
- 230000003287 optical effect Effects 0.000 claims abstract description 22
- 230000000694 effects Effects 0.000 claims abstract description 4
- 230000004075 alteration Effects 0.000 claims description 20
- 230000005499 meniscus Effects 0.000 claims description 19
- 238000003384 imaging method Methods 0.000 abstract description 11
- 239000011521 glass Substances 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract 1
- 230000000149 penetrating effect Effects 0.000 abstract 1
- 239000003086 colorant Substances 0.000 description 3
- 230000003595 spectral effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 210000001747 pupil Anatomy 0.000 description 2
- 206010010071 Coma Diseases 0.000 description 1
- 201000009310 astigmatism Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000005331 crown glasses (windows) Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000005308 flint glass Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003333 near-infrared imaging Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B11/00—Filters or other obturators specially adapted for photographic purposes
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Lenses (AREA)
Abstract
The invention discloses a kind of miniaturization focal length fog penetration lens and optoelectronic devices, the camera lens is from object space to image space from front to back successively including optical filter, the first lens group, the second lens group, the third lens group, the 4th lens group, the optical filter, first to fourth lens group are all made of glass material and are made, and are in same optical axis；Wherein, the first lens group, combined focal length are positive, including lens similar in two focal powers；Second lens group and the third lens group are the cemented doublets that focal power is negative, the color difference that retains is negative, and front is negative lens, and rear is positive lens；4th lens group, combined focal length are positive, principal plane locations of the principal plane locations far from the third lens group；Optical filter is removably set in front of first lens group, has cut-off effect to less than 700nm and greater than the light of 950nm wave band.This programme can take into account white light and Penetrating Fog screening-mode, and good imaging quality, camera lens is small in size, light-weight, and cost performance is high, especially suitable for holding electrooptical device.
Description
Technical Field
The invention belongs to the technical field of optical lenses, and particularly relates to a miniaturized long-focus fog-penetrating lens and photoelectric equipment.
Background
The existing camera lens is a high-end scientific and technological product with a mature technology, but is more suitable for the condition with good visibility, under the application environment with low visibility such as haze weather, the farther observation distance can be reached through increasing the focal length, but in order to guarantee certain imaging quality, the existing fog-penetrating lens often needs to be provided with more lenses, or a double-lens system of a visible light imaging lens and a near infrared imaging lens is adopted, the cost of the lens is increased, the structure complexity and the assembly difficulty are increased, the lens is large in size, and the portability and the attractiveness are influenced.
Disclosure of Invention
In order to solve the above problems in the prior art, on the one hand, a miniaturized telephoto fog-penetrating lens with high pixel, small volume and good fog-penetrating function is provided. The specific implementation mode is as follows:
a miniaturized long-focus fog-penetrating lens sequentially comprises an optical filter, a first lens group, a second lens group, a third lens group and a fourth lens group from an object side to an image side from front to back; wherein,
the first lens group has a positive combined focal length, comprises two lenses with similar focal power, and is used for sharing a chief ray deflection angle on average and reducing the height of incident rays;
the second lens group and the third lens group are double-cemented lenses with negative focal power and negative reserved chromatic aberration, the front parts of the second lens group and the third lens group are negative lenses, the rear parts of the second lens group and the third lens group are positive lenses, and the second lens group and the third lens group are used for enabling focused light rays to deviate from an optical axis so as to reduce the deflection angle of the light rays again and offset the chromatic aberration generated by the first lens group;
the fourth lens group has positive combined focal length, and the main surface position of the fourth lens group is far away from the main surface position of the third lens group, so that the fourth lens group is used for correcting curvature of field and focusing light on an image surface to play a role in reducing the total length;
and the optical filter is movably arranged in front of the first lens group, has a cut-off effect on light with wave bands of less than 700nm and more than 950nm, and is used in a fog-penetrating mode.
Preferably, the first lens group comprises a biconvex positive lens and a first meniscus positive lens in sequence from front to back.
Preferably, a focal length f1 of the biconvex positive lens of the first lens group satisfies: 90 < f1 < 100, and a focal length f2 of the first positive meniscus lens satisfies: 90 < f2 < 100.
Preferably, the second lens group comprises a first plano-concave negative lens and a second meniscus positive lens which are sequentially cemented from front to back.
Preferably, the third lens group comprises a second plano-concave negative lens and a third meniscus positive lens which are sequentially cemented from front to back.
Preferably, the fourth lens group comprises a fourth positive meniscus lens and a fourth negative meniscus lens in sequence from front to back.
Preferably, the zoom lens further comprises an aperture stop located between the second lens group and the third lens group and close to the third lens group.
Preferably, the ratio of the total length TTL of the miniaturized telephoto fog-penetrating lens to the working distance BFL behind the lens is: TTL/BFL is more than 1.5 and less than 4.5.
Preferably, the ratio of the total length TTL of the miniaturized telephoto fog-penetrating lens to the focal length f' of the lens is: 0.7 < TTL/f' < 1.5.
In another aspect, an optoelectronic device applying the miniaturized long-focus fog-penetrating lens is also provided.
The beneficial effects of the specific implementation mode of the invention are as follows:
through reasonable collocation of optical characteristics of each lens group, the use wave band of the lens covers the wide spectral range of 400-900nm, the integral imaging quality of near infrared light and visible light is ensured, and the total length of the lens is reduced. Under the condition of low visibility such as heavy fog, a high-pixel image can be obtained by using the optical filter in a matching way, and the daylight shooting mode can be realized by removing the optical filter in normal weather. Therefore, the scheme can give consideration to both white light and fog-penetrating shooting modes, has small lens volume, light weight and high cost performance, and is particularly suitable for handheld photoelectric devices.
Drawings
FIG. 1 is a schematic view of a miniaturized telephoto fog-penetrating lens according to an embodiment of the present invention;
FIG. 2 is a schematic view of the various lens groups of FIG. 1;
FIG. 3 is a field curvature diagram of a specific example in six colors of light;
FIG. 4 is a graph of axial chromatic aberration for a specific example at six colors of light;
FIG. 5 is a graph showing the vertical axis chromatic aberration of an embodiment at a wavelength of 0.4861-0.9 μm;
FIG. 6 is a graph of MTF for a specific example in the visible mode;
fig. 7 is an MTF graph in the fog-penetrating mode for the specific example.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The miniaturized telephoto fog-penetrating lens shown in fig. 1 includes an optical filter ICF, a first lens group G1, a second lens group G2, a third lens group G3, and a fourth lens group G4, which are sequentially disposed from an object side to an image side from front to back, wherein the optical filter ICF and all the lens groups are made of glass and are located on the same optical axis.
The schematic diagram of each lens group is shown in fig. 2, wherein the combined focal length of the first lens group G1 is positive, and two lenses with similar focal powers are used to share the chief ray deflection angle on average, so as to reduce the incident ray height. In the present embodiment, the first lens group G1 includes a biconvex positive lens L1 and a first positive meniscus lens L2 disposed behind the biconvex positive lens L1, and the focal length f1 of the biconvex positive lens L1 and the focal length f2 of the first positive meniscus lens L2 satisfy: 90 < f1 < 100, 90 < f2 < 100.
The second lens group G2 and the third lens group G3 are double cemented lenses with negative focal power, which deviate the focused light from the optical axis to reduce the deflection angle of the light again, and the negative lens is in front of the positive lens, and the two groups of reserved chromatic aberration are negative, which is used for offsetting the chromatic aberration generated by the first lens group G1. Specifically, the negative lens in the second lens group G2 is a first plano-concave negative lens L3, and the negative lens in the third lens group G3 is a second plano-concave negative lens L5, both of which are made of flint glass. The positive lens in the second lens group G2 is a second positive meniscus lens L4, and the positive lens in the third lens group G3 is a third positive meniscus lens L6, both of which are made of crown glass.
The fourth lens group G4 has positive focal length, and the main surface position is far away from the main surface position of the third lens group G3, so that the field curvature can be effectively corrected, and meanwhile, the light is focused on the image surface to play a role in reducing the total length. In the present embodiment, the fourth lens group G4 is composed of a fourth positive meniscus lens L7 and a negative meniscus lens L8 disposed behind the fourth positive meniscus lens L7.
The optical filter ICF is movably arranged in front of the first lens group G1, has a cut-off effect on light with wave bands of less than 700nm and more than 950nm, can transmit light with wave bands of 700-950 nm and is used in a fog-penetrating shooting mode.
The four lens groups mutually compensate the generated spherical aberration, coma aberration, field curvature, astigmatism and chromatic aberration, so that the use waveband of the lens covers the wide spectral range of 400-900nm, the integral imaging quality of near infrared light and visible light is ensured, and the total length of the lens is reduced. The optical filter ICF is used in a matched mode, high-pixel images can be obtained under the condition of low visibility such as heavy fog, and the like, and the daylight shooting mode can be realized by removing the optical filter ICF when the optical filter ICF is used in normal weather. Further, an aperture stop STP is disposed between the second lens group G2 and the third lens group G3 and in a position close to the third lens group G3, so that the influence of the presence or absence of a filter on imaging can be corrected, and imaging can be performed more clearly under the conditions of filter arrangement and filter removal.
From the above description, the present solution can give consideration to both white light and fog-penetrating shooting modes, has a small lens size, light weight and high cost performance, and is particularly suitable for handheld optoelectronic devices, such as military handheld optoelectronic devices. The scheme can realize the ratio of the total lens length TTL to the rear lens working distance BFL: TTL/BFL is more than 1.5 and less than 4.5, and the ratio of TTL to lens focal length f' is as follows: 0.7 < TTL/f' < 1.5.
TABLE 1
The optical parameters of an exemplary embodiment are shown in table 1, with an overall lens length TTL of 80mm and an overall mechanical length of 42.4 mm.
The curvature of field is proportional to the square of the field of view, so that as the field of view increases, the image plane is no longer a plane but a curved surface, and when a planar receiving device is used, blurring of the image point occurs. The field curvature is divided into meridian field curvature and sagittal field curvature, which respectively represent the imaging conditions of meridian beams and sagittal beams, and the smaller the value, the better the imaging quality. As shown in fig. 3, FIELD CURVATURE (FIELD CURVATURE) plots for six color lights (0.486 μm, 0.588 μm, 0.656 μm, 0.7 μm, 0.85 μm, 0.900 μm) are shown, where T and S represent image points in the meridional and sagittal directions, respectively.
The lens can be observed in both daytime and heavy fog modes, the use waveband of the lens must cover a wide spectral range of 400-900nm, if chromatic aberration is not corrected, especially when axial chromatic aberration is not well corrected, colored scattered light can be generated due to different turning angles when light rays with different wavelengths emitted by an object point pass through the lens, and image point blurring is caused. FIG. 4 is a graph of axial chromatic aberration corresponding to the six colors of light of FIG. 3, where PUPIL RADIUS refers to the PUPIL RADIUS and LONGITUDINALABERATION refers to the longitudinal aberration, with the axial chromatic aberration curve being closer to the longitudinal axis, the smaller the chromatic aberration. FIG. 5 is a graph of the corresponding vertical axis chromatic aberration, where Maximum Field indicates the Maximum Field of view and the LATERAL COLOR refers to the LATERAL chromatic aberration.
The optical transfer function OTF is a comprehensive evaluation of the imaging quality of a lens, wherein the modulation transfer function MTF reflects the ratio of the contrast of an image to the contrast of an object at a certain spatial frequency, reflecting the transfer capabilities of different spatial frequencies and different contrasts. MTF curves of the lens in a visible light mode (wave band 0.4861-0.6563 μm) and a fog-transparent mode (wave band 0.7-0.9 μm) are respectively shown in fig. 6 and fig. 7, wherein the abscissa is unit spatial frequency of 1mm and the ordinate is modulus of OTF. In an ideal state, the MTF curve is close to 1, but in practice, due to the existence of various aberrations, the MTF curve can only be made to approach 1 as much as possible. The larger the area enclosed by the MTF curve and the horizontal axis is, the better the imaging quality is.
The above embodiments are illustrative of the present invention, but the present invention is not limited to the details of the above embodiments, and various equivalent substitutions or simple modifications within the technical spirit of the present invention by those skilled in the art should be included in the scope of the present invention.
Claims (10)
1. The utility model provides a miniaturized telephoto passes through fog lens which characterized in that:
the lens comprises a light filter, a first lens group, a second lens group, a third lens group and a fourth lens group in sequence from an object side to an image side; wherein,
the first lens group has a positive combined focal length, comprises two lenses with similar focal power and is used for sharing the deflection angle of a main ray on average;
the second lens group and the third lens group are double-cemented lenses with negative focal power and negative reserved chromatic aberration, the front parts of the second lens group and the third lens group are negative lenses, and the rear parts of the second lens group and the third lens group are positive lenses for reducing the deflection angle of light and offsetting the chromatic aberration generated by the first lens group;
the fourth lens group has positive combined focal length, and the main surface position of the fourth lens group is far away from the main surface position of the third lens group, so that the fourth lens group is used for correcting curvature of field and focusing light rays on an image surface;
and the optical filter is movably arranged in front of the first lens group and has a cut-off effect on light with wave bands of less than 700nm and more than 950 nm.
2. The miniaturized telephoto fog-transparent lens according to claim 1, wherein: the first lens group sequentially comprises a biconvex positive lens and a first meniscus positive lens from front to back.
3. The miniaturized telephoto fog-transparent lens according to claim 2, wherein: a focal length f1 of the biconvex positive lens of the first lens group satisfies: 90 < f1 < 100, and a focal length f2 of the first positive meniscus lens satisfies: 90 < f2 < 100.
4. The miniaturized telephoto fog-transparent lens according to claim 1, wherein: the second lens group comprises a first plano-concave negative lens and a second meniscus positive lens which are sequentially cemented from front to back.
5. The miniaturized telephoto fog-transparent lens according to claim 1, wherein: the third lens group comprises a second plano-concave negative lens and a third meniscus positive lens which are sequentially cemented from front to back.
6. The miniaturized telephoto fog-transparent lens according to claim 1, wherein: the fourth lens group sequentially comprises a fourth positive meniscus lens and a negative meniscus lens from front to back.
7. The miniaturized telephoto fog-transparent lens according to claim 1, wherein: and the lens further comprises an aperture stop which is positioned between the second lens group and the third lens group and is close to the third lens group.
8. The miniaturized telephoto fog-transparent lens according to claim 1, wherein: the ratio of the total length TTL of the miniaturized telephoto fog-penetrating lens to the working distance BFL behind the lens is as follows: TTL/BFL is more than 1.5 and less than 4.5.
9. The miniaturized telephoto fog-transparent lens according to claim 1, wherein: the ratio of the total length TTL of the miniaturized long-focus fog-penetrating lens to the focal length f' of the lens is as follows: 0.7 < TTL/f' < 1.5.
10. An electro-optical device using the miniaturized telephoto fog-transparent lens according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910574411.4A CN110262000A (en) | 2019-06-28 | 2019-06-28 | A kind of miniaturization focal length fog penetration lens and optoelectronic device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910574411.4A CN110262000A (en) | 2019-06-28 | 2019-06-28 | A kind of miniaturization focal length fog penetration lens and optoelectronic device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110955032A (en) * | 2020-01-03 | 2020-04-03 | 福建福光天瞳光学有限公司 | Large-target-surface high-resolution optical athermalization lens and working method thereof |
| CN112327462A (en) * | 2020-12-02 | 2021-02-05 | 福建福光天瞳光学有限公司 | Optical lens and imaging method |
| CN114545370A (en) * | 2022-02-25 | 2022-05-27 | 深圳迈塔兰斯科技有限公司 | Laser radar transmitting system and corresponding receiving system thereof |
| CN116648666A (en) * | 2020-12-25 | 2023-08-25 | 富士胶片株式会社 | Lens device, imaging device, operating method of lens device, operating method and program of imaging device |
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2019
- 2019-06-28 CN CN201910574411.4A patent/CN110262000A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110955032A (en) * | 2020-01-03 | 2020-04-03 | 福建福光天瞳光学有限公司 | Large-target-surface high-resolution optical athermalization lens and working method thereof |
| CN110955032B (en) * | 2020-01-03 | 2023-07-21 | 福建福光天瞳光学有限公司 | Large target surface high resolution optical athermalization lens and its working method |
| CN112327462A (en) * | 2020-12-02 | 2021-02-05 | 福建福光天瞳光学有限公司 | Optical lens and imaging method |
| CN116648666A (en) * | 2020-12-25 | 2023-08-25 | 富士胶片株式会社 | Lens device, imaging device, operating method of lens device, operating method and program of imaging device |
| CN114545370A (en) * | 2022-02-25 | 2022-05-27 | 深圳迈塔兰斯科技有限公司 | Laser radar transmitting system and corresponding receiving system thereof |
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