CN215340523U - Zoom pinhole lens optical system - Google Patents
Zoom pinhole lens optical system Download PDFInfo
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- CN215340523U CN215340523U CN202121415874.5U CN202121415874U CN215340523U CN 215340523 U CN215340523 U CN 215340523U CN 202121415874 U CN202121415874 U CN 202121415874U CN 215340523 U CN215340523 U CN 215340523U
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Abstract
The utility model relates to a zoom pinhole lens optical system, which comprises a diaphragm, a front fixed group A, a zoom group B, a compensation group C and a compensation group D, wherein the front fixed group A is a lens group; the front fixed group A is sequentially provided with a double-cemented positive lens group consisting of a positive focal power crescent lens A1, a positive focal power crescent lens A2 and a negative focal power crescent lens A3; the zoom group B is sequentially provided with a double-cemented positive lens group consisting of a positive focal power biconvex lens B1 and a positive focal power crescent lens B2, and a double-cemented positive lens group consisting of a positive focal power biconvex lens B3 and a negative focal power crescent lens B4; the compensation group C is sequentially provided with a negative focal power biconcave lens C1, a positive focal power crescent lens C2, a positive focal power crescent lens C3, a negative focal power crescent lens C4, a negative focal power crescent lens C5 and a positive focal power crescent lens C6; the compensation group D is sequentially provided with a double-cemented positive lens group consisting of a double convex lens D1 with positive focal power, a crescent lens D2 with negative focal power and a crescent lens D3 with positive focal power, has a simple structure and is matched with a one-third-inch CCD.
Description
Technical Field
The utility model relates to an optical system of a zoom pinhole lens, belonging to the technical field of optics.
Background
Due to the characteristic that the pinhole lens can be used for hidden shooting, the pinhole lens is widely applied to special occasions such as public security evidence obtaining, reconnaissance, anti-terrorism, family monitoring, industrial detection and the like.
At present, the pinhole lenses with fixed focal length are basically applied in the market, but the focal length is not variable, so that the size of a monitored picture and the angle of view are fixed and unchangeable, and valuable information cannot be captured and amplified and analyzed in real time. The utility model relates to a zoom pinhole lens, which can realize 4-time continuous zooming by one lens on the premise of not increasing the number of the lenses and has excellent imaging quality.
SUMMERY OF THE UTILITY MODEL
In view of the defects of the prior art, the technical problem to be solved by the utility model is to provide a zoom pinhole lens optical system, which realizes continuous zooming of 4-16 mm by moving one zoom group and two compensation groups.
In order to solve the technical problems, the technical scheme of the utility model is as follows: a zoom pinhole lens optical system is of a four-component zoom transmission type structure, works in a visible light wave band, and is provided with a diaphragm, a front fixed group A, a zoom group B, a compensation group C and a compensation group D coaxially in sequence along axial light incidence from left to right from an object side to an image side; the front fixed group A is sequentially provided with a double-cemented positive lens group consisting of a crescent lens A1 with positive focal power, a crescent lens A2 with positive focal power and a crescent lens A3 with negative focal power; the zoom group B is sequentially provided with a double-cemented positive lens group consisting of a double convex lens B1 with positive focal power and a crescent lens B2 with positive focal power, and a double-cemented positive lens group consisting of a double convex lens B3 with positive focal power and a crescent lens B4 with negative focal power; the compensation group C is sequentially provided with a double-concave lens C1 with negative focal power, a crescent lens C2 with positive focal power, a crescent lens C3 with positive focal power, a crescent lens C4 with negative focal power, a crescent lens C5 with negative focal power and a crescent lens C6 with positive focal power; the compensation group D is sequentially provided with a double-cemented positive lens group consisting of a double convex lens D1 with positive focal power, a crescent lens D2 with negative focal power and a crescent lens D3 with positive focal power.
Preferably, the focal length of the optical system is continuously variable within the range of 4-16 mm.
Preferably, the front fixed group A has a focal length off A' = 35-37 mm, the focal length of the zoom group B isf B' = 20-21 mm, the focal length of the compensation group C isf C' = -121.5-124 mm, the focal length of the compensation group D isf D′=17～18mm。
Preferably, the distance between the diaphragm and the CCD image plane is fixed; the air interval between the diaphragm and the front fixed group A is fixed and unchanged; the air interval between the front fixed group A and the zooming group B is variable within 0.3-18.9 mm; the air interval between the zooming group B and the compensation group C is variable within 4.05-28.96 mm, the air interval between the compensation group C and the compensation group D is variable within 0.3-2 mm, and the air interval between the compensation group D and the CCD image surface is variable within 17.19-21.82 mm; the continuously variable focal length of 4-16 mm can be obtained through the change of the interval.
Preferably, the light beam is imaged for the first time after passing through the diaphragm, the front fixed group A and the zoom group B, the primary image plane is located between the zoom group B and the compensation group C, the primary image plane is imaged for the second time after passing through the compensation group C and the compensation group D, and the secondary image plane is located on the CCD.
Preferably, the diaphragm is arranged at the foremost end of the lens, and the size of the diaphragm hole is unchanged during zooming.
Preferably, the distance between the diaphragm and the CCD image plane remains constant during zooming.
Preferably, all lenses are of standard spherical shape.
Compared with the prior art, the utility model has the following beneficial effects: all the lenses of the utility model adopt standard spherical surfaces, and under the condition of ensuring excellent imaging quality, the continuous conversion of the focal length between 4mm and 16mm is realized by changing the air interval between the front fixed group A and the variable-power group B, the air interval between the variable-power group B and the compensation group C, the air interval between the compensation group C and the compensation group D and the air interval between the compensation group D and the CCD image surface. Matching a one-third inch CCD. The imaging quality is excellent.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a diagram of a 4mm focal length optical system of the present invention.
FIG. 2 is a diagram of a 10mm focal length optical system of the present invention.
FIG. 3 is a diagram of a 16mm focal length optical system of the present invention.
FIG. 4 is a diagram showing the evaluation of the transfer function of the CCD image plane position with a focal length of 4mm in the implementation of the present invention.
FIG. 5 is a diagram showing the evaluation of the transfer function of the image plane position of a CCD with a focal length of 10mm in the practice of the present invention.
FIG. 6 is a diagram showing the evaluation of the transfer function of the CCD image plane position with 16mm focal length in the practice of the present invention.
In the figure: a1 crescent lens a1, a2 crescent lens a2, A3 crescent lens A3, B1 biconvex lens B1, B2 crescent lens B2, B3 biconvex lens B3, B4 crescent lens B4, C1 biconcave lens C1, C2 crescent lens C2, C3 crescent lens C3, C4 crescent lens C4, C5 crescent lens C5, C6 crescent lens C6, D1 biconvex lens D1, D2 crescent lens D2, D3 crescent lens D3, a front fixed group A, B zoom group B, C compensation group C, D compensation group D.
Detailed Description
The utility model is further explained below with reference to the drawings and the embodiments.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As shown in fig. 1 to 6, the present embodiment provides a zoom pinhole lens optical system, which is a four-component zoom transmissive structure, and operates in a visible light band, and a diaphragm, a front fixed group a, a zoom group B, a compensation group C, and a compensation group D are coaxially arranged in sequence from left to right along an axial ray from an object side to an image side; the front fixed group A is sequentially provided with a double-cemented positive lens group consisting of a crescent lens A1 with positive focal power, a crescent lens A2 with positive focal power and a crescent lens A3 with negative focal power; the zoom group B is sequentially provided with a double-cemented positive lens group consisting of a double convex lens B1 with positive focal power and a crescent lens B2 with positive focal power, and a double-cemented positive lens group consisting of a double convex lens B3 with positive focal power and a crescent lens B4 with negative focal power; the compensation group C is sequentially provided with a double-concave lens C1 with negative focal power, a crescent lens C2 with positive focal power, a crescent lens C3 with positive focal power, a crescent lens C4 with negative focal power, a crescent lens C5 with negative focal power and a crescent lens C6 with positive focal power; the compensation group D is sequentially provided with a double-cemented positive lens group consisting of a double convex lens D1 with positive focal power, a crescent lens D2 with negative focal power and a crescent lens D3 with positive focal power.
In the embodiment of the utility model, the focal length of the optical system is continuously variable within 4-16 mm.
In the embodiment of the utility model, the focal length of the front fixed group A isf A' =36.06mm, the focal length of the variable magnification group B isf B' =20.72mm, and the focal length of the compensation group C isf C' = -122.53mm, and the focal length of the compensation group D isf D′=17.17mm。
In the embodiment of the utility model, the distance between the diaphragm and the CCD image surface is fixed and unchanged; the air space between the diaphragm and the front fixed group A is fixed and unchanged and is 5.74 mm; the air interval between the front fixed group A and the zooming group B is variable within 0.3-18.9 mm; the air interval between the zooming group B and the compensation group C is variable within 4.05-28.96 mm, the air interval between the compensation group C and the compensation group D is variable within 0.3-2 mm, and the air interval between the compensation group D and the CCD image surface is variable within 17.19-21.82 mm; the continuously variable focal length of 4-16 mm can be obtained through the change of the interval.
In the embodiment of the utility model, a light beam is imaged for the first time after passing through the diaphragm, the front fixed group A and the zoom group B, a primary image plane is positioned between the zoom group B and the compensation group C, a primary image plane is imaged for the second time after passing through the compensation group C and the compensation group D, and a secondary image plane is positioned on the CCD.
In the embodiment of the utility model, the diaphragm is arranged at the foremost end of the lens, so that hidden shooting is facilitated, and the size of the diaphragm hole is unchanged in the zooming process and is a pinhole with the diameter of 2 mm.
In the embodiment of the utility model, the distance between the diaphragm and the CCD image surface is kept unchanged in the zooming process, and continuous optical zooming is realized through the movement of the zooming group B, the compensation group C and the compensation group D.
In the embodiment of the utility model, all the lenses adopt standard spherical surfaces.
In the embodiment of the utility model, the technical indexes of the optical system of the zoom pinhole lens are as follows:
spectral range: 400 nm-700 nm;
effective relative pore size: 1: 2-1: 8;
focal length: 4-16 mm;
the field angle: 21.2-73.7 degrees;
total optical length: 131.5 mm.
In the embodiment of the utility model, the parameters of the zoom pinhole lens optical system are as follows:
in the embodiment of the present invention, fig. 4 shows that at a focal length of 4mm, the MTF (modulation transfer function) of the full field is > 0.4 at 100lp/mm (line pair/mm); FIG. 5 shows that at a focal length of 10mm, the full field MTF (modulation transfer function) > 0.4 at 100lp/mm (line pair/mm), and FIG. 6 shows that at a focal length of 16mm, the full field MTF (modulation transfer function) > 0.3 at 100lp/mm (line pair/mm), matches a CCD of one-third inch pixel size 5X 5 microns.
An imaging method of a zoom pinhole lens optical system is carried out according to the following steps: the light rays sequentially pass through the diaphragm, the crescent lens A1, the crescent lens A2, the crescent lens A3, the biconvex lens B1, the crescent lens B2, the biconvex lens B3, the crescent lens B4, the biconcave lens C1, the crescent lens C2, the crescent lens C3, the crescent lens C4, the crescent lens C5, the crescent lens C6, the biconvex lens D1, the crescent lens D2 and the crescent lens D3 from left to right and then are imaged on the CCD.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the utility model may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (8)
1. An optical system of a zoom pinhole lens, characterized in that: the optical system is of a four-component zooming transmission type structure, works in a visible light wave band, and is provided with a diaphragm, a front fixed group A, a zoom group B, a compensation group C and a compensation group D coaxially in sequence along axial light incidence from left to right from an object space to an image space; the front fixed group A is sequentially provided with a double-cemented positive lens group consisting of a crescent lens A1 with positive focal power, a crescent lens A2 with positive focal power and a crescent lens A3 with negative focal power; the zoom group B is sequentially provided with a double-cemented positive lens group consisting of a double convex lens B1 with positive focal power and a crescent lens B2 with positive focal power, and a double-cemented positive lens group consisting of a double convex lens B3 with positive focal power and a crescent lens B4 with negative focal power; the compensation group C is sequentially provided with a double-concave lens C1 with negative focal power, a crescent lens C2 with positive focal power, a crescent lens C3 with positive focal power, a crescent lens C4 with negative focal power, a crescent lens C5 with negative focal power and a crescent lens C6 with positive focal power; the compensation group D is sequentially provided with a double-cemented positive lens group consisting of a double convex lens D1 with positive focal power, a crescent lens D2 with negative focal power and a crescent lens D3 with positive focal power.
2. The zoom pinhole lens optical system according to claim 1, characterized in that: the focal length of the optical system is continuously variable within 4-16 mm.
3. The zoom pinhole lens optical system according to claim 1 or 2, characterized in that: the front fixed group A has a focal length off A' = 35-37 mm, the focal length of the zoom group B isf B' = 20-21 mm, the focal length of the compensation group C isf C' = -121.5-124 mm, the focal length of the compensation group D isf D′=17～18mm。
4. The zoom pinhole lens optical system according to claim 1 or 2, characterized in that: the distance between the diaphragm and the CCD image surface is fixed; the air interval between the diaphragm and the front fixed group A is fixed and unchanged; the air interval between the front fixed group A and the zooming group B is variable within 0.3-18.9 mm; the air interval between the zooming group B and the compensation group C is variable within 4.05-28.96 mm, the air interval between the compensation group C and the compensation group D is variable within 0.3-2 mm, and the air interval between the compensation group D and the CCD image surface is variable within 17.19-21.82 mm; the continuously variable focal length of 4-16 mm can be obtained through the change of the interval.
5. The zoom pinhole lens optical system according to claim 1 or 2, characterized in that: the light beam is imaged for the first time after passing through the diaphragm, the front fixing group A and the zoom group B, the primary image surface is located between the zoom group B and the compensation group C, the primary image surface is imaged for the second time after passing through the compensation group C and the compensation group D, and the secondary image surface is located on the CCD.
6. The zoom pinhole lens optical system according to claim 1 or 2, characterized in that: the diaphragm is arranged at the foremost end of the lens, and the size of the diaphragm hole is unchanged in the zooming process.
7. The zoom pinhole lens optical system according to claim 1 or 2, characterized in that: the distance between the diaphragm and the CCD image surface is kept unchanged during zooming.
8. The zoom pinhole lens optical system according to claim 1 or 2, characterized in that: all lenses use standard spherical surfaces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121415874.5U CN215340523U (en) | 2021-06-24 | 2021-06-24 | Zoom pinhole lens optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121415874.5U CN215340523U (en) | 2021-06-24 | 2021-06-24 | Zoom pinhole lens optical system |
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| Publication Number | Publication Date |
|---|---|
| CN215340523U true CN215340523U (en) | 2021-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121415874.5U Active CN215340523U (en) | 2021-06-24 | 2021-06-24 | Zoom pinhole lens optical system |
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|---|---|
| CN (1) | CN215340523U (en) |
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- 2021-06-24 CN CN202121415874.5U patent/CN215340523U/en active Active
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