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Wide-angle pinhole television lens

A pinhole and lens technology, applied in the field of wide-angle pinhole TV lens, can solve the problem of small field angle of pinhole TV lens

Inactive Publication Date: 2004-12-22
THE FIRST RES INST OF MIN OF PUBLIC SECURITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention proposes a wide-angle pinhole TV lens. Its main purpose is to solve the problem that the field angle of the existing pinhole TV lens is too small. question

Method used

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  • Wide-angle pinhole television lens
  • Wide-angle pinhole television lens
  • Wide-angle pinhole television lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0036] The example given by the present invention includes all the data of the entire optical system and the structural design of the entrance pupil part of the pinhole lens.

[0037] The performance index of the example optical system designed by the present invention is as follows:

[0038] System optical power: φ=1.0;

[0039] Field of view: 2ω=105°;

[0040] Relative aperture: Dφ=1:2.8;

[0041] Total system length (entrance pupil to image plane): ∑L=22mm;

[0042] The distance between the aperture stop and the image plane: Lp-i=10.6mm.

[0043] Radius of curvature R

spacing or thickness d

Emissivity Nd

Abbe number υ

pinhole

∞

0.918

-2.5074

1.357

1.6568

51.1

4.1816

0.08

-20.0998

1.517

1.6568

51.1

2.0663

0.08

4.9246

1.657

1.6568

51.1

-4.3972

...

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Abstract

A kind of wide-angle pinhole television lens, its optical system comprises entrance pupil, the back of entrance pupil is provided with first mirror group, the back of first mirror group is provided with the second mirror group that determines the characteristic of aperture diaphragm, the second mirror group There is an aperture diaphragm to control the luminous flux and a third mirror group to make the optical system symmetric and correct aberrations. The second mirror group satisfies the condition that for any point on the focal plane, its entrance pupil is aided by the second mirror group The ratio of the diameter of the aperture stop formed to the diameter of the entrance pupil is a decreasing function of the field angle at that point. It mainly solves the problem that the viewing angle of the existing pinhole TV lens is too small, and also solves the problem that the user needs to make more auxiliary equipment to fix the lens.

Description

technical field [0001] The invention belongs to the field of optical equipment, specifically, it is a wide-angle pinhole TV lens for pinhole imaging together with a TV camera. Background technique [0002] Situations that require television surveillance are often encountered in real life. For example, in museums, bank counters, and jewelry stores, in order to prevent criminals from stealing and other activities, a TV lens is often set for video recording. However, if a large TV camera head is set publicly, the harmonious atmosphere will be destroyed. If a public TV camera is installed in a museum and other places during the implementation of TV surveillance, the style of the exhibition hall will be destroyed. When journalists cover illegal activities, they can put themselves at risk by pointing the camera at the person being interviewed. Openly installing a large camera head in a jewelry store will discourage customers from shopping at ease under the watchful eye of a tele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/16H04N5/225
Inventor 梁来顺
Owner THE FIRST RES INST OF MIN OF PUBLIC SECURITY