CN107884911B - Large-aperture large-target-surface low-light-level imaging lens - Google Patents
Large-aperture large-target-surface low-light-level imaging lens Download PDFInfo
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- CN107884911B CN107884911B CN201711229999.7A CN201711229999A CN107884911B CN 107884911 B CN107884911 B CN 107884911B CN 201711229999 A CN201711229999 A CN 201711229999A CN 107884911 B CN107884911 B CN 107884911B
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- 238000003384 imaging method Methods 0.000 title claims abstract description 18
- 239000000853 adhesive Substances 0.000 claims abstract description 14
- 230000001070 adhesive effect Effects 0.000 claims abstract description 14
- 125000005647 linker group Chemical group 0.000 claims abstract description 9
- 230000003287 optical effect Effects 0.000 claims abstract description 7
- 238000007789 sealing Methods 0.000 claims abstract description 3
- 125000006850 spacer group Chemical group 0.000 claims description 12
- 230000005499 meniscus Effects 0.000 claims description 9
- 238000004026 adhesive bonding Methods 0.000 claims description 4
- 238000005286 illumination Methods 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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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
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
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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
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/026—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using retaining rings or springs
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Microscoopes, Condenser (AREA)
- Lenses (AREA)
- Lens Barrels (AREA)
Abstract
The invention relates to a large-aperture large-target-surface low-light-level imaging lens, wherein a front lens group A, an iris diaphragm B and a rear lens group C are sequentially arranged in an optical system of the lens along the incident direction of light rays from left to right, the front lens group A comprises a negative crescent lens A1, a positive crescent lens A2, a first bonding group formed by a planoconvex lens A3 and a biconcave lens A4 in a sealing manner, and a biconvex lens A5; the rear lens group C comprises a negative crescent lens C1, a second adhesive combination formed by closely connecting a double convex lens C2 and a double concave lens C3, a double convex lens C4 and a plano-concave lens C5 which are arranged from left to right in sequence. The lens adopts 10 spherical lenses, realizes clear imaging of a large target surface with F1.0 large aperture, and effectively improves the detection capability of the lens under the condition of weak illumination; meanwhile, the lens has the advantages of compact structure, small volume and light weight.
Description
The technical field is as follows:
the invention belongs to the technical field of photoelectricity, and particularly relates to a large-aperture large-target-surface low-light-level imaging lens.
Background art:
under the environment with good lighting conditions, a satisfactory imaging picture can be easily obtained by using a common camera lens, but when the camera lens is used under low-illumination conditions such as night and low light, auxiliary light sources such as an infrared light supplement lamp and a flash lamp need to be added, so that the whole structure of the system is enlarged, the definition of the imaging picture is reduced, and the picture details are easily lost. The glimmer lens has very strong light collecting capacity and light transmission capacity, and can realize bright and clear imaging effect under the weak light condition by matching with a high-light-sensitive imaging chip. The glimmer lens has the main characteristics of large aperture and capability of allowing more light rays to enter the system, so that auxiliary light sources such as a flash lamp and the like are not needed, the overall structure of the system is greatly simplified, and the difficulty of aberration correction is improved. The existing low-light-level lens has low resolution, large volume, small target surface, high cost caused by adopting an aspheric surface and the like, and the comprehensive performance of the lens still has a great promotion space.
The invention content is as follows:
the invention aims to provide the large-aperture large-target-surface low-light-level imaging lens aiming at the defects.
In order to achieve the purpose, the invention adopts the technical scheme that: a large-aperture large-target-surface low-light-level imaging lens is characterized in that a front lens group A, an iris diaphragm B and a rear lens group C are sequentially arranged in an optical system of the lens along the incident direction of light rays from left to right, wherein the front lens group A comprises a negative crescent lens A1, a positive crescent lens A2, a first bonding group formed by a planoconvex lens A3 and a biconcave lens A4 in a sealing manner, and a biconvex lens A5; the rear lens group C comprises a negative crescent lens C1, a second adhesive combination formed by closely connecting a double convex lens C2 and a double concave lens C3, a double convex lens C4 and a plano-concave lens C5 which are arranged from left to right in sequence.
Further, the air space between the front lens group A and the iris diaphragm B is 4.0mm, and the air space between the iris diaphragm B and the rear lens group C is 0.76 mm.
Further, the air space between the negative meniscus lens a1 and the positive meniscus lens a2 was 0.9mm, the air space between the positive meniscus lens a2 and the first cemented group formed by the planoconvex lens A3 and the biconcave lens a4 in close contact was 7.0mm, and the air space between the first cemented group formed by the planoconvex lens A3 and the biconcave lens a4 in close contact and the biconvex lens a5 was 12.1 mm; the air space between the negative meniscus lens C1 and the second adhesive composition consisting of the biconvex lens C2 and the biconcave lens C3 in close contact with each other was 3.0mm, the air space between the second adhesive composition consisting of the biconvex lens C2 and the biconcave lens C3 in close contact with the biconvex lens C4 was 2.7mm, and the air space between the biconvex lens C4 and the plano-concave lens C5 was 2.3 mm.
Further, the mechanical structure of the lens comprises a front group lens barrel, a rear group lens barrel and a variable diaphragm assembly arranged between the front group lens barrel and the rear group lens barrel, wherein the front lens group A is arranged in the front group lens barrel, the front end of the negative crescent lens A1 is provided with a front group pressing ring, a front group spacing ring I is arranged between the positive crescent lens A2 and a first gluing group formed by tightly connecting a planoconvex lens A3 and a biconcave lens A4, and a front group spacing ring II is arranged between the first gluing group formed by tightly connecting a planoconvex lens A3 and a biconcave lens A4 and a biconvex lens A5; the iris diaphragm B is arranged in the iris diaphragm assembly; the rear lens group C is arranged in a rear lens barrel, a rear group pressing ring is arranged at the front end of the negative crescent lens C1, a rear group spacer ring I is arranged between the negative crescent lens C1 and a second adhesive group formed by closely connecting a double convex lens C2 and a double concave lens C3, a rear group spacer ring II is arranged between the second adhesive group formed by closely connecting a double convex lens C2 and a double concave lens C3 and a double convex lens C4, and a rear group spacer ring III is arranged between the double convex lens C4 and a flat concave lens C5.
Furthermore, the variable diaphragm assembly comprises a diaphragm moving ring, a diaphragm sheet, a diaphragm motor and a microswitch, wherein the diaphragm moving ring is arranged on the front group lens barrel through a clamping ring, a diaphragm moving ring gear is arranged on the outer circumferential surface of the diaphragm moving ring, and a diaphragm shifting nail is also screwed on the diaphragm moving ring; the diaphragm sheet is arranged between the diaphragm moving ring and the front group of lens barrels; the diaphragm motor is arranged on the front group lens barrel through a diaphragm motor frame, a diaphragm motor gear meshed with the diaphragm moving ring gear is fixedly connected to a motor shaft of the diaphragm motor, and the diaphragm motor rotates to change the diaphragm aperture; the micro switch is arranged on the front group lens barrel through a diaphragm limiting frame, and the micro switch and the diaphragm shifting nail are matched to form limiting protection of the diaphragm.
Furthermore, the mechanical structure of the lens further comprises a connecting bottom plate, the front lens cone and the rear lens cone are respectively arranged on the connecting bottom plate, the rear end of the connecting bottom plate is provided with a camera CCD, the front end of the camera CCD is connected with a CCD sleeve, and the CCD sleeve is sleeved outside the rear end of the rear lens cone.
Compared with the prior art, the invention has the following effects:
(1) the lens adopts 10 spherical lenses, realizes clear imaging of a large target surface with F1.0 large aperture, and effectively improves the detection capability of the lens under the condition of weak illumination;
(2) the lens has compact structure, small volume and light weight.
Description of the drawings:
FIG. 1 is a schematic diagram of an optical system according to an embodiment of the present invention;
FIG. 2 is a general view of a mechanical assembly of an embodiment of the present invention.
In the figure:
1-front group lens barrel; 2-a light barrier sheet; 3-diaphragm limiting frame; 4-a microswitch; 5-rear group lens barrel; 6-diaphragm motor gear; 7-a diaphragm motor frame; 8-a CCD sleeve; 9-a rubber gasket; 10-diaphragm motor; 11-camera CCD; 12-a connection backplane; 13-rear group spacer ring III; 14-rear group spacing ring II; 15-a snap ring; 16-rear group space ring I; 17-rear group pressing ring; 18-front group space ring II; 19-diaphragm moving ring; 20-front group space ring I; 21-front group pressing ring; a 1-negative crescent a 1; a2-orthodontic lens A2; a3-plano-convex lens A3; a 4-biconcave lens a 4; a 5-biconvex lens a 5; b-iris diaphragm B; c1-negative crescent lens C1; c2 — biconvex lens C2; c3-biconcave lens C3; c4-biconvex lens C4; c5-plano-concave lens C5.
The specific implementation mode is as follows:
the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1-2, in an optical system of the large-aperture large-target-surface low-light-level imaging lens of the present invention, a front lens group a, an iris diaphragm B, and a rear lens group C are sequentially disposed along a left-to-right incident direction of light, where the front lens group a includes a negative crescent lens a1, a positive crescent lens a2, a first cemented group formed by a plano-convex lens A3 and a biconcave lens a4, and a biconvex lens a 5; the rear lens group C comprises a negative crescent lens C1, a second adhesive combination formed by closely connecting a double convex lens C2 and a double concave lens C3, a double convex lens C4 and a plano-concave lens C5 which are arranged from left to right in sequence.
In this embodiment, the air space between the front lens group a and the iris diaphragm B is 4.0mm, and the air space between the iris diaphragm B and the rear lens group C is 0.76 mm.
In this embodiment, the air space between the negative meniscus lens a1 and the positive meniscus lens a2 is 0.9mm, the air space between the positive meniscus lens a2 and the first cemented group formed by the plano-convex lens A3 and the biconcave lens a4 in close contact is 7.0mm, and the air space between the first cemented group formed by the plano-convex lens A3 and the biconcave lens a4 in close contact and the biconvex lens a5 is 12.1 mm; the air space between the negative meniscus lens C1 and the second adhesive composition consisting of the biconvex lens C2 and the biconcave lens C3 in close contact with each other was 3.0mm, the air space between the second adhesive composition consisting of the biconvex lens C2 and the biconcave lens C3 in close contact with the biconvex lens C4 was 2.7mm, and the air space between the biconvex lens C4 and the plano-concave lens C5 was 2.3 mm.
In this embodiment, the mechanical structure of the lens includes a front group lens barrel 1, a rear group lens barrel 5, and a variable diaphragm assembly disposed between the front group lens barrel 1 and the rear group lens barrel 5, the front lens group a is mounted in the front group lens barrel 1, a front group pressure ring 21 is disposed at the front end of the negative crescent lens a1, a front group spacer i 20 is disposed between the positive crescent lens a2 and a first bonding group formed by tightly connecting a plano-convex lens A3 and a biconcave lens a4, and a front group spacer ii 18 is disposed between the first bonding group formed by tightly connecting a plano-convex lens A3 and a biconcave lens a4 and a biconvex lens a 5; the iris diaphragm B is arranged in the iris diaphragm assembly; the rear lens group C is mounted in the rear lens barrel 5, a rear group pressing ring 17 is arranged at the front end of the negative crescent lens C1, a rear group spacer ring i 16 is arranged between the negative crescent lens C1 and a second bonding group formed by closely connecting a double convex lens C2 and a double concave lens C3, a rear group spacer ring ii 14 is arranged between the second bonding group formed by closely connecting a double convex lens C2 and a double concave lens C3 and a double convex lens C4, and a rear group spacer ring iii 13 is arranged between the double convex lens C4 and a plano-concave lens C5.
In this embodiment, the variable diaphragm assembly includes a diaphragm moving ring 19, a diaphragm sheet 2, a diaphragm motor 10 and a micro switch 4, the diaphragm moving ring 19 is disposed on the front group lens barrel 1 through a snap ring 15, a diaphragm moving ring gear is disposed on an outer circumferential surface of the diaphragm moving ring 19, and a diaphragm shifting nail is further screwed on the diaphragm moving ring 19; the diaphragm sheet 2 is arranged between the diaphragm moving ring 19 and the front group of lens barrels 1; the diaphragm motor 10 is arranged on the front group lens barrel 1 through a diaphragm motor frame 7, a diaphragm motor 10 gear 6 meshed with the diaphragm moving ring gear is fixedly connected to a motor shaft of the diaphragm motor 10, and the diaphragm motor 10 rotates to change the diaphragm aperture; the micro switch 4 is arranged on the front group lens barrel 1 through the diaphragm limiting frame 3, and the micro switch 4 is matched with the diaphragm shifting nail to form limiting protection of the diaphragm.
In this embodiment, the mechanical structure of the lens further includes a connecting bottom plate 12, the front lens barrel 1 and the rear lens barrel 5 are respectively disposed on the connecting bottom plate 12, the rear end of the connecting bottom plate 12 is provided with a camera CCD11, the front end of the camera CCD11 is connected with a CCD sleeve 8, and the CCD sleeve 8 is sleeved outside the rear end of the rear lens barrel 5.
In this embodiment, a rubber gasket 9 is disposed between the CCD sleeve 8 and the camera CCD 11.
In this example, the parameters of each lens are shown in the following table:
in this embodiment, the optical system constituted by the above lens group achieves the following optical indexes:
1. focal length: f' =35 mm;
2. relative pore size D/F = 1/1.0;
3. angle of view 2 ω: 25 degrees;
4. spectral range: 600 nm-900 nm;
5. target surface size: phi 16 mm;
6. lens size: less than or equal to 120 x66x51.5mm.
In this embodiment, light rays sequentially enter the front lens group a, the iris diaphragm B and the rear lens group C for imaging.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (4)
1. The utility model provides a big target surface shimmer imaging lens of big light ring which characterized in that: the optical system of the lens is sequentially provided with a front lens group A, an iris diaphragm B and a rear lens group C along the incident direction of light rays from left to right, wherein the front lens group A comprises a negative crescent lens A1, a positive crescent lens A2, a first bonding group formed by a plano-convex lens A3 and a biconcave lens A4 in a sealing manner, and a biconvex lens A5; the rear lens group C comprises a negative crescent lens C1, a second adhesive group formed by closely connecting a double convex lens C2 and a double concave lens C3, a double convex lens C4 and a plano-concave lens C5 which are arranged from left to right in sequence; the air space between the front lens group A and the iris diaphragm B is 4.0mm, and the air space between the iris diaphragm B and the rear lens group C is 0.76 mm; the air space between the negative crescent lens A1 and the positive crescent lens A2 is 0.9mm, the air space between the positive crescent lens A2 and the first bonding group formed by closely connecting the plano-convex lens A3 and the biconcave lens A4 is 7.0mm, and the air space between the first bonding group formed by closely connecting the plano-convex lens A3 and the biconcave lens A4 and the biconvex lens A5 is 12.1 mm; the air space between the negative meniscus lens C1 and the second adhesive composition consisting of the biconvex lens C2 and the biconcave lens C3 in close contact with each other was 3.0mm, the air space between the second adhesive composition consisting of the biconvex lens C2 and the biconcave lens C3 in close contact with the biconvex lens C4 was 2.7mm, and the air space between the biconvex lens C4 and the plano-concave lens C5 was 2.3 mm.
2. The large-aperture large-target-surface low-light imaging lens as claimed in claim 1, wherein: the mechanical structure of the lens comprises a front group lens barrel, a rear group lens barrel and a variable diaphragm assembly arranged between the front group lens barrel and the rear group lens barrel, wherein the front lens group A is arranged in the front group lens barrel, the front end of the negative crescent lens A1 is provided with a front group pressing ring, a front group spacing ring I is arranged between the positive crescent lens A2 and a first gluing group formed by tightly connecting a planoconvex lens A3 and a biconcave lens A4, and a front group spacing ring II is arranged between a first gluing group formed by tightly connecting a planoconvex lens A3 and a biconcave lens A4 and a biconvex lens A5; the iris diaphragm B is arranged in the iris diaphragm assembly; the rear lens group C is arranged in a rear lens barrel, a rear group pressing ring is arranged at the front end of the negative crescent lens C1, a rear group spacer ring I is arranged between the negative crescent lens C1 and a second adhesive group formed by closely connecting a double convex lens C2 and a double concave lens C3, a rear group spacer ring II is arranged between the second adhesive group formed by closely connecting a double convex lens C2 and a double concave lens C3 and a double convex lens C4, and a rear group spacer ring III is arranged between the double convex lens C4 and a flat concave lens C5.
3. The large-aperture large-target-surface low-light imaging lens as claimed in claim 2, wherein: the variable diaphragm assembly comprises a diaphragm moving ring, a diaphragm sheet, a diaphragm motor and a microswitch, the diaphragm moving ring is arranged on the front group lens barrel through a clamping ring, a diaphragm moving ring gear is arranged on the outer circumferential surface of the diaphragm moving ring, and a diaphragm shifting nail is further screwed on the diaphragm moving ring; the diaphragm sheet is arranged between the diaphragm moving ring and the front group of lens barrels; the diaphragm motor is arranged on the front group lens barrel through a diaphragm motor frame, a diaphragm motor gear meshed with the diaphragm moving ring gear is fixedly connected to a motor shaft of the diaphragm motor, and the diaphragm motor rotates to change the diaphragm aperture; the micro switch is arranged on the front group lens barrel through a diaphragm limiting frame, and the micro switch and the diaphragm shifting nail are matched to form limiting protection of the diaphragm.
4. The large-aperture large-target-surface low-light imaging lens as claimed in claim 2, wherein: the mechanical structure of the lens further comprises a connecting bottom plate, the front lens cone and the rear lens cone are respectively arranged on the connecting bottom plate, the rear end of the connecting bottom plate is provided with a camera CCD, the front end of the camera CCD is connected with a CCD sleeve, and the CCD sleeve is sleeved outside the rear end of the rear lens cone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711229999.7A CN107884911B (en) | 2017-11-29 | 2017-11-29 | Large-aperture large-target-surface low-light-level imaging lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711229999.7A CN107884911B (en) | 2017-11-29 | 2017-11-29 | Large-aperture large-target-surface low-light-level imaging lens |
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| CN107884911A CN107884911A (en) | 2018-04-06 |
| CN107884911B true CN107884911B (en) | 2020-05-19 |
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| CN201711229999.7A Active CN107884911B (en) | 2017-11-29 | 2017-11-29 | Large-aperture large-target-surface low-light-level imaging lens |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109061981A (en) * | 2018-08-30 | 2018-12-21 | 湖北华中光电科技有限公司 | A kind of structure automatically adjusting iris diaphgram diaphragm diameter size |
| CN111624746A (en) * | 2020-04-27 | 2020-09-04 | 长春理工大学 | Light low-light-level night vision lens |
| CN111856736B (en) * | 2020-07-10 | 2022-06-03 | 宁波永新光学股份有限公司 | Objective lens of microscope |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001194590A (en) * | 1999-10-29 | 2001-07-19 | Minolta Co Ltd | Image pickup lens device |
| CN103809275A (en) * | 2014-03-03 | 2014-05-21 | 福建福光数码科技有限公司 | Aspherical infrared night vision zoom pick-up lens |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014041196A (en) * | 2012-08-21 | 2014-03-06 | Canon Inc | Zoom lens and imaging apparatus using the same |
| CN204925492U (en) * | 2015-08-06 | 2015-12-30 | 福建福光股份有限公司 | Wide angle shimmer camera lens |
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2017
- 2017-11-29 CN CN201711229999.7A patent/CN107884911B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001194590A (en) * | 1999-10-29 | 2001-07-19 | Minolta Co Ltd | Image pickup lens device |
| CN103809275A (en) * | 2014-03-03 | 2014-05-21 | 福建福光数码科技有限公司 | Aspherical infrared night vision zoom pick-up lens |
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