CN107422455B - Fixed focus lens and 3CCD camera comprising same - Google Patents
Fixed focus lens and 3CCD camera comprising same Download PDFInfo
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- CN107422455B CN107422455B CN201710680825.6A CN201710680825A CN107422455B CN 107422455 B CN107422455 B CN 107422455B CN 201710680825 A CN201710680825 A CN 201710680825A CN 107422455 B CN107422455 B CN 107422455B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- 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
- G02B15/177—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 negative front lens or group of lenses
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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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Abstract
The invention relates to a fixed focus lens, which comprises an object plane side and an image plane side which are coaxially arranged in sequence: a first crescent concave lens with negative refractive power; a second crescent concave lens with negative refractive power; a third crescent concave lens with negative refractive power; a first crescent convex lens with positive refractive power; a first biconvex lens with positive refractive power; a first biconcave lens with negative refractive power; an iris diaphragm; a fourth crescent concave lens with negative refractive power; a second crescent convex lens with positive refractive power; a third crescent convex lens with positive refractive power; a second biconvex lens with positive refractive power; a third biconvex lens with positive refractive power; a fifth meniscus lens with negative refractive power. The invention can improve the image quality in shooting in a certain wide working range by adopting the structure, and can provide photoelectric signals for an 1/2' 3CCD color camera to generate clear and natural color images.
Description
Technical Field
The invention relates to the field of optical imaging, in particular to a fixed-focus lens and a 3CCD camera comprising the same.
Background
With the improvement of the 3CCD system, the built-in prism of the camera can accurately divide light rays entering the lens into three colors and transmit the three colors to the corresponding CCD chip, the color can be accurately recorded in the process, images with rich and sharp details are provided, and the requirement of professional shooting is met.
The lens design is optimized for aberration correction at the usual focal distance, but junction aberration may occur at the closest shooting distance.
Disclosure of Invention
The invention aims to provide a specially designed fixed focus lens adaptive to a 3CCD camera, which is beneficial to exerting the imaging potential of a 3CCD system and meets the requirements of professional shooting on high resolution, low chromatic aberration, small distortion and the like of the lens adaptive to the 3CCD system.
In order to solve the technical problems, the invention adopts the technical scheme that:
the utility model provides a tight shot of adaptation in 3CCD camera which characterized in that: including by object plane side to image plane side coaxial setting in proper order: a first crescent concave lens with negative refractive power; a second crescent concave lens with negative refractive power; a third crescent concave lens with negative refractive power; a first crescent convex lens with positive refractive power; a first biconvex lens with positive refractive power; a first biconcave lens with negative refractive power; an iris diaphragm; a fourth crescent concave lens with negative refractive power; a second crescent convex lens with positive refractive power; a third crescent convex lens with positive refractive power; a second biconvex lens with positive refractive power; a third biconvex lens with positive refractive power; a fifth meniscus lens with negative refractive power.
In an alternative embodiment, the first biconvex lens and the first biconcave lens are cemented to each other to form a first cemented lens; and the fourth crescent concave lens and the second crescent convex lens are cemented with each other to form a second cemented lens; and the third biconvex lens and the fifth crescent concave lens are cemented with each other to form a third cemented lens.
In an alternative embodiment, the object side surface of the first crescent concave lens is a convex surface; the object side surface of the second February concave lens is a convex surface; the object side surface of the third crescent concave lens is a convex surface; the object side surface of the first crescent convex lens is a concave surface; the object side surface of the second cemented lens is a concave surface; and the object side surface of the third crescent convex lens is a concave surface.
In an alternative embodiment, the spacing d between the first crescent concave lens and the second crescent concave lens1-2Satisfies 0.12<d1-2/EFL<0.14; spacing d between second crescent concave lens and third crescent concave lens2-3Satisfies 0.08<d2-3/EFL<0.12; the interval d between the third crescent concave lens and the first crescent convex lens3-4Satisfies 0.12<d3-4/EFL<0.16; interval d between first crescent convex lens and first cemented lens4-56Satisfies 0.45<d4-56/EFL<0.49; a first cemented lens andspacing d between the second cemented lenses56-78Satisfies 1.12<d45-78/EFL<1.16; spacing d between the second cemented lens and the third crescent convex lens78-9Satisfies 0.003<d78-9/EFL<0.004; the interval d between the third crescent convex lens and the second biconvex lens9-10Satisfies 0.002<d9-10/EFL<0.005; the interval d between the second biconvex lens and the third cemented lens10-11/12Satisfies 0.003<d10-11/12/EFL<0.005; spacing d between the third cemented lens and the image plane11/12-ISatisfies 1.20<d11/12-I/EFL<1.40, where EFL is the focal length of the lens.
In an alternative embodiment, the field angle of the fixed-focus lens is 55 °.
In an alternative embodiment, a distance D1 between the iris diaphragm and the third crescent convex lens and a distance D2 between the fifth crescent concave lens and the image plane satisfy 1.5 < (D1+ D2)/EFL < 2.5, and EFL is a focal length value of the fixed focus lens.
In an optional embodiment, the fixed-focus lens satisfies 0.4< y/EFL <0.6, where y is a half-image height of the fixed-focus lens, and EFL is a focal length value of the fixed-focus lens.
In an alternative embodiment, the maximum clear aperture of the fixed-focus lens satisfies Fno <3, where Fno is the F-number of the fixed-focus lens.
In an optional embodiment, the back working distance BFL of the fixed-focus lens satisfies BFL/EFL >1.2, where EFL is a focal length value of the lens.
In an optional embodiment, the total length TTL of the fixed focus lens satisfies TTL/EFL <6, where EFL is a focal length value of the lens.
The invention also relates to a 3CCD camera comprising the fixed-focus lens.
The invention has the beneficial effects that: the lens has the characteristics of high resolution, low chromatic aberration, small distortion and the like, the optical system adopts a floating focusing structure, can improve the image quality of a shot image in a certain wide working range, and can provide an 1/2' 3CCD color camera with a photoelectric signal to generate a clear and natural color image.
Drawings
Fig. 1 is a schematic structural diagram of a fixed-focus lens according to an embodiment of the present invention;
fig. 2 is an optical path diagram of a fixed focus lens according to an embodiment of the present invention;
FIG. 3 is an axial spherical aberration diagram of a fixed focus lens according to an embodiment of the present invention;
FIG. 4 is a vertical axis chromatic aberration diagram of a fixed focus lens according to an embodiment of the present invention;
FIG. 5 is a diffuse speckle pattern of a fixed focus lens according to an embodiment of the invention;
FIG. 6 is a graph of MTF for a fixed focus lens according to an embodiment of the present invention;
fig. 7 is a relative illuminance diagram of a fixed-focus lens according to an embodiment of the present invention.
Description of reference numerals:
a-1, a first crescent concave lens; a-2, a second February concave lens; a-3, a third crescent concave lens;
a-4, a first crescent convex lens; a-5, a first biconvex lens; a-6, a first biconcave lens;
a-7, a fourth crescent concave lens; a-8, a second crescent convex lens; a-9, a third crescent convex lens;
a-10, a second biconvex lens; a-11, a third biconvex lens; a-12, fifth crescent concave lens.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
As shown in fig. 1, a fixed focus lens adapted to a 3CCD camera according to an embodiment of the present invention includes, coaxially arranged in order from an object plane side to an image plane side: a first crescent concave lens A-1 with negative refractive power; a second crescent concave lens A-2 with negative refractive power; a third crescent concave lens A-3 with negative refractive power; a first crescent convex lens A-4 with positive refractive power; a first biconvex lens A-5 with positive refractive power; a first biconcave lens A-6 with negative refractive power; an iris diaphragm; a fourth crescent concave lens A-7 with negative refractive power; a second crescent convex lens A-8 with positive refractive power; a third crescent convex lens A-9 with positive refractive power; a second biconvex lens A-10 with positive refractive power; a third biconvex lens a-11 having positive refractive power; a fifth meniscus concave lens A-12 with negative refractive power.
In an alternative embodiment, the first biconvex lens a-5 and the first biconcave lens a-6 are cemented together to form a first cemented lens; and the fourth crescent concave lens A-7 and the second crescent convex lens A-8 are cemented with each other to form a second cemented lens; and the third biconvex lens a-11 and the fifth crescent concave lens a-12 are cemented with each other to form a third cemented lens.
In an alternative embodiment, the object side surface of the first crescent concave lens A-1 is a convex surface; the object side surface of the second crescent concave lens A-2 is a convex surface; the object side surface of the third crescent concave lens A-3 is a convex surface; the object side surface of the first crescent convex lens A-4 is a concave surface; the object side surface of the second cemented lens is a concave surface; the object side surface of the third crescent convex lens A-9 is a concave surface.
In an alternative embodiment, the spacing d between the first crescent concave lens A-1 and the second crescent concave lens A-21-2Satisfies 0.12<d1-2/EFL<0.14; the interval d between the second crescent concave lens A-2 and the third crescent concave lens A-32-3Satisfies 0.08<d2-3/EFL<0.12; the interval d between the third crescent concave lens A-3 and the first crescent convex lens A-43-4Satisfies 0.12<d3-4/EFL<0.16; the interval d between the first crescent convex lens A-4 and the first cemented lens4-56Satisfies 0.45<d4-56/EFL<0.49; spacing d between the first and second cemented lenses56-78Satisfies 1.12<d45-78/EFL<1.16; the interval d between the second cemented lens and the third crescent convex lens A-978-9Satisfies 0.003<d78-9/EFL<0.004; the interval d between the third crescent convex lens A-9 and the second biconvex lens A-109-10Satisfies 0.002<d9-10/EFL<0.005; the interval d between the second biconvex lens A-10 and the third cemented lens10-11/12Satisfies 0.003<d10-11/12/EFL<0.005; spacing d between the third cemented lens and the image plane11/12-ISatisfies 1.20<d11/12-I/EFL<1.40, where EFL is the focal length of the lens.
In an alternative embodiment, the field angle of the fixed-focus lens is 55 °.
In an alternative embodiment, the distance D1 between the iris diaphragm and the third crescent convex lens A-9 and the distance D2 between the fifth crescent concave lens A-12 and the image plane satisfy 1.5 < (D1+ D2)/EFL < 2.5, and EFL is the focal length value of the prime lens. Therefore, the optical system has a floating focusing function, and can improve the quality of the shot image within a certain range.
In an optional embodiment, the fixed-focus lens satisfies 0.4< y/EFL <0.6, where y is a half-image height of the fixed-focus lens, and EFL is a focal length value of the fixed-focus lens.
In an alternative embodiment, the maximum clear aperture of the fixed-focus lens satisfies Fno <3, where Fno is the F-number of the fixed-focus lens.
In an optional embodiment, the back working distance BFL of the fixed-focus lens satisfies BFL/EFL >1.2, where EFL is a focal length value of the lens.
In an optional embodiment, the total length TTL of the fixed focus lens satisfies TTL/EFL <6, where EFL is a focal length value of the lens.
The invention also relates to a 3CCD camera comprising the fixed-focus lens.
The lens has the characteristics of high resolution, low chromatic aberration, small distortion and the like, a floating focusing mechanism can be used in the system, the image quality in short-distance shooting is improved, and a 1/2' 3CCD color camera can be provided with a photoelectric signal to generate a clear and natural color image.
Fig. 2 illustrates an optical path diagram of a fixed focus lens according to an embodiment of the present invention. As can be seen from the figure, the fixed-focus lens can well process incident light and converge the incident light on an image surface.
As can be seen from fig. 3 to 7, the fixed-focus lens according to the embodiment of the present invention has very good performance, and can meet practical requirements.
The first embodiment is as follows:
in the present embodiment, the data of the fixed focus lens is as follows:
wherein numerals 1 to 22 sequentially indicate distances from an optical surface of each lens from an object surface side to an image surface side to an immediately next optical surface (in the case where both optical surfaces belong to the same lens, they indicate the thickness of the lens). The thickness or distance values are labeled "D1" and "D2", which indicate the distance between the two surfaces of the lens at different working distances, and the distance is shown in Table two.
Watch two
In the present embodiment, the focal length of the fixed-focus lens is 28.5 mm. Therefore, the fixed-focus lens can meet the mainstream requirements.
In this embodiment, the maximum clear aperture F number of the fixed-focus lens is 2.8, which satisfies: fno <3, where Fno is the F-number of the optical system.
In the present embodiment, the field angle of the fixed-focus lens is 55 °.
In this embodiment, the fixed-focus lens is matched with a CCD of 1/8 ″, the half-image height is 15mm, and y/EFL is 0.526, which satisfies 0.4< y/EFL <0.6, where y is the half-image height of the optical system and EFL is the focal length of the lens.
In the embodiment, the back working intercept BFL of the fixed-focus lens is 37.039mm, and BFL/EFL is 1.299, which satisfies BFL/EFL >1.2, wherein EFL is the focal length value of the lens.
In the present embodiment, the total length TTL of the fixed focus lens is 167mm, and TTL/EFL is 5.86, which satisfies TTL/EFL <6, where EFL is the focal length value of the lens.
In this embodiment, the lens is matched with 1/8 "CCD to achieve a resolution of 1500 ten thousand pixels.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. A fixed focus lens is characterized by comprising the following lenses: the device is sequentially and coaxially arranged from the object plane side to the image plane side: a first crescent concave lens with negative refractive power; a second crescent concave lens with negative refractive power; a third crescent concave lens with negative refractive power; a first crescent convex lens with positive refractive power; a first biconvex lens with positive refractive power; a first biconcave lens with negative refractive power; an iris diaphragm; a fourth crescent concave lens with negative refractive power; a second crescent convex lens with positive refractive power; a third crescent convex lens with positive refractive power; a second biconvex lens with positive refractive power; a third biconvex lens with positive refractive power; a fifth meniscus lens with negative refractive power;
wherein the first biconvex lens and the first biconcave lens are cemented with each other to form a first cemented lens; and the fourth crescent concave lens and the second crescent convex lens are cemented with each other to form a second cemented lens; and the third biconvex lens and the fifth crescent concave lens are cemented with each other to form a third cemented lens;
wherein the distance d1-2 between the first crescent concave lens and the second crescent concave lens satisfies 0.12< d1-2/EFL < 0.14; the interval d2-3 between the second crescent concave lens and the third crescent concave lens satisfies 0.08< d2-3/EFL < 0.12; the interval d3-4 between the third crescent concave lens and the first crescent convex lens meets 0.12< d3-4/EFL < 0.16; the interval d4-56 between the first crescent convex lens and the first cemented lens satisfies 0.45< d4-56/EFL < 0.49; the spacing d56-78 between the first cemented lens and the second cemented lens satisfies 1.12< d45-78/EFL < 1.16; the interval d78-9 between the second cemented lens and the third crescent convex lens satisfies 0.003< d78-9/EFL < 0.004; the interval d9-10 between the third crescent convex lens and the second biconvex lens satisfies 0.002< d9-10/EFL < 0.005; the spacing d10-11/12 between the second biconvex lens and the third cemented lens satisfies 0.003< d10-11/12/EFL < 0.005; the interval d11/12-I between the third cemented lens and the image plane satisfies 1.20< d11/12-I/EFL <1.40, wherein EFL is the focal length value of the prime lens;
the distance D1 between the iris diaphragm and the third crescent convex lens and the distance D2 between the fifth crescent concave lens and the image plane satisfy 1.5 < (D1+ D2)/EFL < 2.5;
the prime lens meets the condition that y/EFL is less than 0.6 and is the half-image height of the prime lens;
the rear working distance BFL of the fixed-focus lens meets the condition that BFL/EFL is more than 1.2;
the total length TTL of the fixed focus lens meets TTL/EFL < 6.
2. The prime lens according to claim 1, wherein: the object side surface of the first crescent concave lens is a convex surface; the object side surface of the second February concave lens is a convex surface; the object side surface of the third crescent concave lens is a convex surface; the object side surface of the first crescent convex lens is a concave surface; the object side surface of the second cemented lens is a concave surface; and the object side surface of the third crescent convex lens is a concave surface.
3. The fixed-focus lens according to claim 1, wherein the maximum clear aperture of the fixed-focus lens satisfies Fno <3, wherein Fno is the F number of the fixed-focus lens.
4. A 3CCD camera comprising the prime lens according to any one of claims 1 to 3.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710680825.6A CN107422455B (en) | 2017-08-10 | 2017-08-10 | Fixed focus lens and 3CCD camera comprising same |
| PCT/CN2018/098422 WO2019029436A1 (en) | 2017-08-10 | 2018-08-03 | Fixed focus lens and 3ccd camera comprising said fixed focus lens |
| GB1911569.0A GB2573716B (en) | 2017-08-10 | 2018-08-03 | Prime Lens and 3CCD Camera Comprising Same |
| DE112018000721.9T DE112018000721B4 (en) | 2017-08-10 | 2018-08-03 | Fixed focal length lens and 3CCD camera that includes it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710680825.6A CN107422455B (en) | 2017-08-10 | 2017-08-10 | Fixed focus lens and 3CCD camera comprising same |
Publications (2)
| Publication Number | Publication Date |
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| CN107422455A CN107422455A (en) | 2017-12-01 |
| CN107422455B true CN107422455B (en) | 2020-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710680825.6A Active CN107422455B (en) | 2017-08-10 | 2017-08-10 | Fixed focus lens and 3CCD camera comprising same |
Country Status (4)
| Country | Link |
|---|---|
| CN (1) | CN107422455B (en) |
| DE (1) | DE112018000721B4 (en) |
| GB (1) | GB2573716B (en) |
| WO (1) | WO2019029436A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107422455B (en) * | 2017-08-10 | 2020-04-10 | 福建浩蓝光电有限公司 | Fixed focus lens and 3CCD camera comprising same |
| CN118033875A (en) * | 2024-04-09 | 2024-05-14 | 宁波舜宇光电信息有限公司 | Wide-angle focusing optical imaging lens and imaging equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106019541A (en) * | 2015-03-30 | 2016-10-12 | 株式会社腾龙 | Inner focusing lens |
| JP2017053977A (en) * | 2015-09-09 | 2017-03-16 | リコーイメージング株式会社 | Zoom lens system |
| CN106707476A (en) * | 2015-11-13 | 2017-05-24 | 佳能株式会社 | Zoom lens and image pickup apparatus including the same |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4359061B2 (en) * | 2003-03-14 | 2009-11-04 | パナソニック株式会社 | Small zoom lens, and digital camera and video camera using the same |
| CN101354478B (en) * | 2007-07-23 | 2010-06-02 | 扬明光学股份有限公司 | Focus fixing lens |
| JP2009186790A (en) * | 2008-02-07 | 2009-08-20 | Fujinon Corp | Projection lens and projection display device with the same |
| JP2010122326A (en) * | 2008-11-17 | 2010-06-03 | Fujinon Corp | Zoom lens for projection and projection-type display device |
| CN107422455B (en) * | 2017-08-10 | 2020-04-10 | 福建浩蓝光电有限公司 | Fixed focus lens and 3CCD camera comprising same |
-
2017
- 2017-08-10 CN CN201710680825.6A patent/CN107422455B/en active Active
-
2018
- 2018-08-03 DE DE112018000721.9T patent/DE112018000721B4/en active Active
- 2018-08-03 GB GB1911569.0A patent/GB2573716B/en active Active
- 2018-08-03 WO PCT/CN2018/098422 patent/WO2019029436A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106019541A (en) * | 2015-03-30 | 2016-10-12 | 株式会社腾龙 | Inner focusing lens |
| JP2017053977A (en) * | 2015-09-09 | 2017-03-16 | リコーイメージング株式会社 | Zoom lens system |
| CN106707476A (en) * | 2015-11-13 | 2017-05-24 | 佳能株式会社 | Zoom lens and image pickup apparatus including the same |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2573716B (en) | 2022-04-27 |
| GB2573716A (en) | 2019-11-13 |
| WO2019029436A1 (en) | 2019-02-14 |
| DE112018000721B4 (en) | 2021-05-12 |
| GB201911569D0 (en) | 2019-09-25 |
| DE112018000721T5 (en) | 2019-11-14 |
| CN107422455A (en) | 2017-12-01 |
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