CN110687668A - Optical passive type athermal long-focus short-wave infrared continuous zoom lens - Google Patents
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- G—PHYSICS
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- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
- G02B15/167—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
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- G02B15/00—Optical objectives with means for varying the magnification
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- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
- G02B15/167—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
- G02B15/173—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged +-+
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Abstract
The invention relates to an optical passive athermal long-focus short-wave infrared continuous zoom lens.A front fixed group A with positive focal power, a zoom group B with negative focal power, a compensation group C with positive focal power, a diaphragm D and a rear fixed group E with negative focal power are sequentially arranged in an optical system of a lens along the incident direction of light rays from left to right; the front fixed group A comprises a first adhesive combination of a positive meniscus lens A1, a negative meniscus lens A2 and a positive meniscus lens A3 in tight joint, and a second adhesive combination of a negative meniscus lens A4 and a positive meniscus lens A5 in tight joint; the zoom group B comprises a third adhesive combination formed by tightly connecting a plano-concave lens B1, a double-concave lens B2 and a double-convex lens B3; the compensation group C comprises a double convex lens C1, a fourth adhesive group formed by tightly connecting a negative meniscus lens C2 and a double convex lens C3, and a positive meniscus lens C4; the rear fixed group E comprises a biconcave lens E1, a positive meniscus lens E2, a negative meniscus lens E3 and a positive meniscus lens E4, and the longest focal length of the rear fixed group E is 510 mm; the optical passive athermal design in a wide temperature range is realized, and temperature focusing is not needed.
Description
Technical Field
The invention relates to an optical passive athermalization long-focus short-wave infrared continuous zoom lens which is suitable for the camera shooting fields of camouflage identification, fire suppression, mineral deposit discovery, target monitoring and the like.
Background
Compared with visible light, the short-wave infrared has more excellent fog penetration capability, and can greatly improve the visibility in a fire smoke environment; the infrared sensor is sensitive to high-temperature objects, and can determine the ignition point more accurately than long-wave infrared; the short wave infrared is sensitive to moisture and can be used for rainstorm early warning, detection, tornado observation and the like. Under the condition of bad weather and low visibility, the imaging is similar to a visible light image, and has better detail resolution and analysis capability than thermal imaging. The difference between the reflection spectrum of the near-infrared band to green plants and the camouflage paint is very large, and the conventional camouflage has no any significance to a near-infrared imaging system and can be used as a new safety defense means for discovering camouflage. Therefore, the development of the short-wave infrared lens is very necessary.
However, the development and application time of the current continuous zooming short-wave infrared lens is short, the focal length is generally not long and is about less than 200 mm; the long-focus short-wave infrared lens is generally a fixed-focus lens and cannot meet the requirement of large-field-of-view monitoring; when the focal length is long, due to the fact that the ultra-low dispersion material is needed to correct the second-order spectral aberration, the temperature is sensitive, when the external working environment is complex, frequent temperature focusing is needed, the using effect is affected, when the target is high in running speed and needs to be tracked continuously, the target may be lost, and the tracking task fails.
Disclosure of Invention
Aiming at the defects, the invention provides the optical passive type athermalization long-focus short-wave infrared continuous zoom lens with a simple structure.
The optical passive athermal long-focus short-wave infrared continuous zoom lens has the technical scheme that a front fixed group A with positive focal power, a zoom group B with negative focal power, a compensation group C with positive focal power, a diaphragm D and a rear fixed group E with negative focal power are sequentially arranged in an optical system of the lens along the incident direction of light rays from left to right; the front fixed group A comprises a first adhesive combination of a positive meniscus lens A1, a negative meniscus lens A2 and a positive meniscus lens A3 in tight joint, and a second adhesive combination of a negative meniscus lens A4 and a positive meniscus lens A5 in tight joint; the zoom group B comprises a third adhesive combination formed by tightly connecting a plano-concave lens B1, a double-concave lens B2 and a double-convex lens B3; the compensation group C comprises a double convex lens C1, a fourth adhesive group formed by tightly connecting a negative meniscus lens C2 and a double convex lens C3, and a positive meniscus lens C4; the rear fixed group E includes a biconcave lens E1, a positive meniscus lens E2, a negative meniscus lens E3, a positive meniscus lens E4.
Further, the air space between the front fixed group A and the zooming group B is 82.64-148.07 mm, the air space between the zooming group B and the compensation group C is 103.85-2.12 mm, and the air space between the compensation group C and the rear fixed group E is 4.7-41.0 mm.
Further, the air space between the positive meniscus lens A1 and the first adhesive combination is 2.96mm, the air space between the first adhesive combination and the second adhesive combination is 12.58mm, both adhesive surfaces have negative refractive power and are bent to the image surface side, and the difference of the refractive indexes of the second adhesive surface is 0.35, so that the positive meniscus lens A1 has good achromatism capability and simultaneously plays a role in eliminating thermal difference in cooperation with other lenses of the front fixing group A.
Further, the air space between the plano-concave lens B1 and the third cemented lens group is 3.83mm, the cemented surface has positive refractive power, the difference between the refractive indexes of the lens materials on both sides of the cemented surface is 0.07, and the cemented surface bends to the image surface side, thereby having the function of balancing chromatic aberration of different focal length sections.
Further, the air space between the double convex lens C1 and the fourth glue lens is 0.12mm, the air space between the fourth glue lens C4 and the positive meniscus lens C4 is 0.1mm, the glue surface has negative refractive power, the difference between the refractive indexes of the lens materials on the two sides of the glue surface is 0.35, the glue surface bends to the image surface side, the function of correcting short-focus secondary spectral aberration is achieved, and the functions of reducing chromatic aberration and eliminating thermal aberration in the short-focus position are achieved by matching with other lenses of the compensation group.
Further, the air space between the biconcave lens E1 and the positive meniscus lens E2 is 0.42mm, the air space between the positive meniscus lens E2 and the negative meniscus lens E3 is 53.58mm, and the air space between the negative meniscus lens E3 and the positive meniscus lens E4 is 11.74 mm.
Further, the front fixing group a has at least two negative refractive power cemented surfaces, and at least one of them satisfies: the two sides of the bonding surface are respectively a negative lens with negative focal power and a positive lens with positive focal power, the difference of the refractive indexes is more than 0.3, and the bonding surface bends to the image surface side.
Further, the zoom group B is provided with at least one cemented surface with positive refractive power, and satisfies the following conditions: the difference of the refractive indexes of the lens materials at the two sides of the bonding surface is more than 0.05 and less than 0.1, and the bonding surface bends to the image surface side.
Furthermore, the compensation group C at least comprises three lenses with positive focal power and at least one lens with negative focal power, the negative lens is cemented with one of the positive lenses, the difference of the refractive indexes is more than 0.3, and the cemented surface has negative refractive power and bends to the image surface side.
Furthermore, the focal power of the rear fixed group E is negative, and more than one lens with negative focal power is provided.
Compared with the prior art, the invention has the following beneficial effects: (1) adopt positive compensation structure for the focal power of front group is less, reduces second grade spectral aberration, and uses the ultralow dispersion material, has greatly improved the resolution ratio level of telephoto end, makes the focus possible 510mm longest, can satisfy the short wave infrared camera user demand of 7um pixel size. (2) Continuous zooming, and simultaneously meeting the requirements of large-area panoramic search and small-area enlarged observation, wherein the short-focus focal length is 73.5 mm. (3) The total optical length is only 365mm, the ratio of the total optical length to the longest focal length is 0.72, and the optical lens has the advantage of compact structure. (4) The design of the whole-course optical passive type athermal difference of zooming is realized, and temperature focusing is not needed under the wide temperature dynamic range, so that the structure is simple. Since temperature focusing is not required, stability of the tele aiming at the optical axis can be ensured.
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The invention is further described with reference to the following figures.
FIG. 1 is a schematic diagram of an optical system according to an embodiment of the present invention;
FIG. 2 is a graph of the MTF in the tele state of an embodiment of the invention;
FIG. 3 is a graph of MTF at-40 ℃ for the long focus of an embodiment of the invention;
FIG. 4 is a graph of MTF at +60 ℃ for the long focus of an embodiment of the invention;
FIG. 5 is a graph of the MTF at short focus for an embodiment of the invention;
FIG. 6 is a graph of MTF at-40 ℃ for short focus for an example of the invention;
FIG. 7 is a graph of MTF at +60 ℃ for short focus for an example of the invention;
in the figure: front fixed group A, B zoom group B, C compensation group C, D diaphragm D, E rear fixed group E, A1 positive meniscus lens a1, a2 negative meniscus lens a2, A3 positive meniscus lens A3, a4 negative meniscus lens a4, a5 positive meniscus lens a5, B1 plano-concave lens B1, B2 biconcave lens B2, B3 biconvex lens B3, C1 biconvex lens C1, C2 negative meniscus lens C2, C3 biconvex lens C3, C4 positive meniscus lens C4, E1 biconcave lens E1, E2 positive meniscus lens E2, E3 negative meniscus lens E3, E4 positive meniscus lens E4.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
As shown in fig. 1 to 7, in an optical system of the lens, a front fixed group a with positive focal power, a zoom group B with negative focal power, a compensation group C with positive focal power, a diaphragm D, and a rear fixed group E with negative focal power are sequentially arranged along a direction of incidence of light rays from left to right; the front fixed group A comprises a first adhesive combination of a positive meniscus lens A1, a negative meniscus lens A2 and a positive meniscus lens A3 in tight joint, and a second adhesive combination of a negative meniscus lens A4 and a positive meniscus lens A5 in tight joint; the zoom group B comprises a third adhesive combination formed by tightly connecting a plano-concave lens B1, a double-concave lens B2 and a double-convex lens B3; the compensation group C comprises a double convex lens C1, a fourth adhesive group formed by tightly connecting a negative meniscus lens C2 and a double convex lens C3, and a positive meniscus lens C4; the rear fixed group E comprises a biconcave lens E1, a positive meniscus lens E2, a negative meniscus lens E3 and a positive meniscus lens E4; the continuous change of the focal length is realized by changing the intervals among the front fixed group A, the zoom group B, the compensation group C and the diaphragm D and keeping the total length unchanged. When zooming from a wide-angle end to a telephoto end, the zoom group B is far away from the object side, and the compensation group C is close to the object side; the glass material is reasonably selected and matched with the lens barrel material, so that the optical passive type heat difference eliminating capability in the whole zooming process is realized, and the temperature focusing is not needed within the temperature range from minus 40 ℃ to plus 60 ℃; arranging an image pickup element on the image surface side, and converting an optical image into an electric signal; the positive meniscus lens a5 uses ultra-low dispersion N-PK52A material.
In the embodiment, the air space between the front fixed group A and the variable-magnification group B is 82.64-148.07 mm, the air space between the variable-magnification group B and the compensation group C is 103.85-2.12 mm, and the air space between the compensation group C and the rear fixed group E is 4.7-41.0 mm.
In this embodiment, the air space between the positive meniscus lens a1 and the first cemented lens is 2.96mm, the air space between the first cemented lens and the second cemented lens is 12.58mm, both cemented surfaces have negative refractive power and are both curved to the image plane side, wherein in the second cemented surface, the materials of the adjacent lenses a4 and a5 are respectively N-SF57 and N-PK52A, the refractive index difference is 0.35, and the positive meniscus lens a1 and the second cemented lens have good effect of eliminating long-focus secondary spectral aberration. Meanwhile, the temperature coefficient of the refractive index of the N-PK52A is a negative value and has a large absolute value, so that the N-PK52A and other positive power lenses A1 and A3 mutually compensate the influence of temperature effect and play a role in optical passive type athermalization. In this embodiment, 5/9 < (the ratio of the focal length of the lens A5 to the focal length of the front fixed group A) < 7/9 has the best effect on eliminating the thermal difference for the technical index of the system.
In this embodiment, the air space between the plano-concave lens B1 and the third cemented lens is 3.83mm, the cemented surface adjacent lenses are B2 and B3, the materials are N-LASF31A and SF59, respectively, and have positive refractive power, the difference between the refractive indexes is 0.07, and the cemented surface bends to the image plane side, thereby having the function of balancing chromatic aberration of different focal length segments.
In this embodiment, the air space between the biconvex lens C1 and the fourth glue group is 0.12mm, the air space between the fourth glue group and the positive meniscus lens C4 is 0.1mm, the adjacent lenses of the glue surfaces are C2 and C3, the materials are SF59 and N-PK52A, respectively, the negative refractive power is provided, the difference between the refractive powers is 0.35, the glue surfaces are bent to the image plane side, the short-focus secondary spectral aberration is corrected, and the functions of achromatizing and eliminating thermal difference for the short-focus position are achieved by matching with other lenses of the compensation group.
In the present embodiment, the air space between the biconcave lens E1 and the positive meniscus lens E2 is 0.42mm, the air space between the positive meniscus lens E2 and the negative meniscus lens E3 is 53.58mm, and the air space between the negative meniscus lens E3 and the positive meniscus lens E4 is 11.74 mm.
In this embodiment, the front fixing group a has at least two negative refractive power cemented surfaces, and at least one of the surfaces satisfies: the two sides of the bonding surface are respectively a negative lens with negative focal power and a positive lens with positive focal power, the difference of the refractive indexes is more than 0.3, and the bonding surface bends to the image surface side.
In this embodiment, the variable magnification group B has at least one cemented surface with positive refractive power, and satisfies: the difference of the refractive indexes of the lens materials at the two sides of the bonding surface is more than 0.05 and less than 0.1, and the bonding surface bends to the image surface side.
In this embodiment, the compensation group C includes at least three lenses having positive refractive power and at least one lens having negative refractive power, the negative lens is cemented with one of the positive lenses, the refractive index difference is greater than 0.3, and the cemented surface has negative refractive power and bends toward the image plane side.
In this embodiment, the power of the rear fixed group E is negative, and the rear fixed group E has one or more lenses having negative power.
In the present embodiment, the optical system constituted by the lens group achieves the following optical indexes:
1. the working wave band is as follows: 900 nm-1700 nm;
2. focal length: 73.5 mm-510 mm;
3. the field angle: 1.37-9.52 degrees;
4. relative pore diameter: 1/6 long cokes and 1/4.5 short cokes;
5. optical transfer function: when the spatial frequency of the transfer function is 70p/mm, the long focus and the short focus have good contrast and can be matched with an 2/3' target surface short wave infrared camera with the pixel size of 7 um.
6. The total optical length is less than only 365 mm;
7. working temperature: the temperature is between 40 ℃ below zero and 60 ℃, the optical passive athermalization design is realized, and temperature focusing is not needed.
In the present embodiment, example data of the present optical lens system is shown in the following table:
the invention adopts a positive group compensation zooming structure, so that the compact design can be realized by depending on the fastest zooming cam curve. When the magnification of the zoom group is m2When = 1, the multiplying factor of the compensation group is m31=m32And = 1, the position of the focal point is in smooth transition, and the fastest zooming is realized, so that the lead is small, the total optical length is short, and the structure is compact.
The difference of the refractive index of the bonding surface can be properly adjusted according to the actual design index.
The above-mentioned preferred embodiments, further illustrating the objects, technical solutions and advantages of the present invention, should be understood that the above-mentioned are only preferred embodiments of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An optics passive form disappears hot difference long focal length shortwave infrared continuous zoom lens which characterized in that: a front fixed group A with positive focal power, a zoom group B with negative focal power, a compensation group C with positive focal power, a diaphragm D and a rear fixed group E with negative focal power are sequentially arranged in an optical system of the lens along the incident direction of light rays from left to right; the front fixed group A comprises a first adhesive combination of a positive meniscus lens A1, a negative meniscus lens A2 and a positive meniscus lens A3 in tight joint, and a second adhesive combination of a negative meniscus lens A4 and a positive meniscus lens A5 in tight joint; the zoom group B comprises a third adhesive combination formed by tightly connecting a plano-concave lens B1, a double-concave lens B2 and a double-convex lens B3; the compensation group C comprises a double convex lens C1, a fourth adhesive group formed by tightly connecting a negative meniscus lens C2 and a double convex lens C3, and a positive meniscus lens C4; the rear fixed group E includes a biconcave lens E1, a positive meniscus lens E2, a negative meniscus lens E3, a positive meniscus lens E4.
2. The optically passive athermal long focal length short wave infrared zoom lens of claim 1, wherein: the air space between the front fixed group A and the zooming group B is 82.64-148.07 mm, the air space between the zooming group B and the compensation group C is 103.85-2.12 mm, and the air space between the compensation group C and the rear fixed group E is 4.7-41.0 mm.
3. The optically passive athermal long focal length short wave infrared zoom lens of claim 1, wherein: the air space between the positive meniscus lens A1 and the first gluing group is 2.96mm, the air space between the first gluing group and the second gluing group is 12.58mm, both gluing surfaces have negative refractive power and are bent to the image surface side, wherein the difference of the refractive indexes of the second gluing surface is 0.35, so that the positive meniscus lens A1 has good achromatism capability and simultaneously plays a role in matching with other lenses of the front fixing group A to eliminate thermal aberration.
4. The optically passive athermal long focal length short wave infrared zoom lens of claim 1, wherein: the air space between the plano-concave lens B1 and the third bonding group is 3.83mm, the bonding surface has positive refractive power, the difference between the refractive indexes of the lens materials at the two sides of the bonding surface is 0.07, and the bonding surface bends to the image surface side and has the function of balancing chromatic aberration of different focal length sections.
5. The optically passive athermal long focal length short wave infrared zoom lens of claim 1, wherein: the air space between the double convex lens C1 and the fourth gluing group is 0.12mm, the air space between the fourth gluing group and the positive meniscus lens C4 is 0.1mm, the gluing surface has negative refractive power, the difference of the refractive indexes of the lens materials at the two sides of the gluing surface is 0.35, the gluing surface bends to the image surface side, the short-focus secondary spectrum aberration is corrected, and the functions of achromatizing and eliminating heat difference of the short-focus position are achieved by matching with other lenses of the compensation group.
6. The optically passive athermal long focal length short wave infrared zoom lens of claim 1, wherein: the air space between the biconcave lens E1 and the positive meniscus lens E2 is 0.42mm, the air space between the positive meniscus lens E2 and the negative meniscus lens E3 is 53.58mm, and the air space between the negative meniscus lens E3 and the positive meniscus lens E4 is 11.74 mm.
7. The optically passive athermal long focal length short wave infrared zoom lens of claim 1, wherein: the front fixing group A is provided with at least two negative refractive power gluing surfaces, and at least one of the two negative refractive power gluing surfaces meets the following requirements: the two sides of the bonding surface are respectively a negative lens with negative focal power and a positive lens with positive focal power, the difference of the refractive indexes is more than 0.3, and the bonding surface bends to the image surface side.
8. The optically passive athermal long focal length short wave infrared zoom lens of claim 1, wherein: the zoom group B is provided with at least one cemented surface with positive refractive power, and satisfies the following conditions: the difference of the refractive indexes of the lens materials at the two sides of the bonding surface is more than 0.05 and less than 0.1, and the bonding surface bends to the image surface side.
9. The optically passive athermal long focal length short wave infrared zoom lens of claim 1, wherein: the compensation group C at least comprises three lenses with positive focal power and at least one lens with negative focal power, the negative lens is cemented with one of the positive lenses, the difference of the refractive indexes is more than 0.3, and the cemented surface has negative refractive power and bends to the image surface side.
10. The optically passive athermal long focal length short wave infrared zoom lens of claim 1, wherein: the focal power of the rear fixed group E is negative, and more than one lens with negative focal power is provided.
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| CN113448067A (en) * | 2021-05-21 | 2021-09-28 | 中国科学院西安光学精密机械研究所 | Switching type zooming heat difference eliminating type long-wave infrared zoom lens |
| CN116107073A (en) * | 2022-12-25 | 2023-05-12 | 福建福光股份有限公司 | Ultra-large multiple low-distortion short wave infrared optical system |
| CN117850009A (en) * | 2024-03-07 | 2024-04-09 | 成都优视光电技术有限公司 | Ultra-high definition micro-zoom lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112162392A (en) * | 2020-09-25 | 2021-01-01 | 中国科学院西安光学精密机械研究所 | Short wave infrared two-gear zoom optical lens |
| CN112162392B (en) * | 2020-09-25 | 2021-07-27 | 中国科学院西安光学精密机械研究所 | Short wave infrared two-gear zoom optical lens |
| CN112666692A (en) * | 2020-12-22 | 2021-04-16 | 福建福光股份有限公司 | Large-zoom-ratio ultra-long-focal-length high-definition fog-penetrating lens and imaging method thereof |
| CN113448067A (en) * | 2021-05-21 | 2021-09-28 | 中国科学院西安光学精密机械研究所 | Switching type zooming heat difference eliminating type long-wave infrared zoom lens |
| CN116107073A (en) * | 2022-12-25 | 2023-05-12 | 福建福光股份有限公司 | Ultra-large multiple low-distortion short wave infrared optical system |
| CN116107073B (en) * | 2022-12-25 | 2024-03-15 | 福建福光股份有限公司 | Ultra-large multiple low-distortion short wave infrared optical system |
| CN117850009A (en) * | 2024-03-07 | 2024-04-09 | 成都优视光电技术有限公司 | Ultra-high definition micro-zoom lens |
| CN117850009B (en) * | 2024-03-07 | 2024-05-03 | 成都优视光电技术有限公司 | Ultra-high definition micro-zoom lens |
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