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Zoom pinhole camera lens

A pinhole camera and zoom technology, applied in installation, optics, instruments, etc., can solve the problems of inconvenient observation and image processing, observation and engineering installation, etc., and achieve stable image surface without drift, overall symmetry, and smooth cam curve. Effect

Active Publication Date: 2011-12-07
FUJIAN FORECAM OPTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, at the same object distance, the lens has only one fixed magnification, which brings inconvenience to observation and image processing
If you want to observe targets of different distances and scenes of different field of view, you need to replace lenses with different focal lengths, which brings great inconvenience to observation and engineering installation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] refer to figure 1 with figure 2 , a zoom pinhole camera lens, along the incident direction of light from left to right, the front group A, the relay I group B, and the relay II group C are respectively set with positive focal powers; the front group A is sequentially provided with A glued group of positive crescent lens A-1 and negative crescent lens A-2 in close contact with positive crescent lens A-3; the relay group I is sequentially provided with biconvex lens B-1 and positive crescent lens B-2 , a plano-convex lens B-3 and a negative crescent lens B-4; the relay group II is sequentially provided with a biconvex lens C-1, a biconvex lens C-2, a biconvex lens C-3 and a biconvex lens C-4.

[0017] The air gap between the above-mentioned front group A and the relay group I group B is 3.96 mm to 22.72 mm; the air gap between the relay group I group B and the relay group II group C is 29.53 mm to 5.36 mm; The air gap between Group II C and the image plane is: 8.19 mm...

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Abstract

The invention relates to a zoom pinhole camera lens which is characterized in that a front group A, a relay I group B and relay II group C with positive focal power are respectively arranged at an incidence direction of the light from left to right. The front group A is sequentially provided with a gluing group with a tightly connected positive crescent type lens A-1 and a negative crescent type lens A-2, and a positive crescent type lens A-3; the relay I group is sequentially provided with a double convex lens B-1, a positive crescent type lens B-2, a plane convex lens B-3 and a negative crescent type lens B-4; and the relay II group is sequentially provided with a double convex lens C-1, a double convex lens C-3 and a double convex lens C-4. The lens in the invention has a zooming function, can adapt demands of different environments, and is convenient for engineering construction when the lens is mounted.

Description

technical field [0001] The invention relates to a pinhole camera lens with variable focal length, which is applied to video surveillance and camera shooting in special environments such as home anti-theft, public security pre-trial, prison administration, and medical hyperbaric oxygen chamber equipment. Background technique [0002] The appearance and practical application of the "pinhole" lens have a history of several decades, and it is still widely used today. image 3 Structured fixed focal length pinhole lens. Its optical route consists of a front group and a relay group, which is a fixed focal length lens. Obviously, at the same object distance, the lens has only one fixed magnification, which brings inconvenience to observation and image processing. If it is necessary to observe objects of different distances and different fields of view, it is necessary to replace lenses with different focal lengths, which brings great inconvenience to observation and engineering in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G02B13/06G02B13/18G02B7/02G02B7/09
Inventor 张清苏屈立辉林小钟黄友镜
Owner FUJIAN FORECAM OPTICS CO LTD