Cassegrain for enhancing stray light-extinction effect and improved-type imaging system thereof

An imaging system and an improved technology, applied in optics, optical components, instruments, etc., can solve problems such as complex structures, and achieve the effects of small height, reduced weight and volume, and reduced load

Inactive Publication Date: 2010-06-30
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

due to L 1 , L 2 and L 3 Both require corresponding fixed structures, making the structure more complicated

Method used

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  • Cassegrain for enhancing stray light-extinction effect and improved-type imaging system thereof
  • Cassegrain for enhancing stray light-extinction effect and improved-type imaging system thereof
  • Cassegrain for enhancing stray light-extinction effect and improved-type imaging system thereof

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Embodiment Construction

[0053] as attached Figure 13 As shown, Cassegrain and its improved imaging system with a stray light elimination device include a secondary mirror 6 with a convex reflective surface, a primary mirror 7 with a concave reflective surface, a secondary mirror shading tube 1 and a primary mirror shading tube 4 , wherein the primary mirror 7 and the secondary mirror 6 are arranged on the same optical axis, the primary mirror 7 has a central circular hole 8, the primary mirror shading tube 4 is located at the central circular hole 8 of the primary mirror 7, and the secondary mirror shading tube 1 is set on the secondary mirror 6 The outer edge of the secondary mirror shading cylinder 1 is provided with an additional extinction cylinder for preventing light from entering the image plane through the central circular hole 8 of the primary mirror 7 between the secondary mirror shading cylinder 1 and the primary mirror shading cylinder 4. 2. The stray light elimination device is composed...

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PUM

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Abstract

The invention discloses a cassegrain for enhancing a stray light-extinction effect and an improved-type imaging system thereof, comprising a secondary mirror with a reflecting surface as a convex surface, a primary mirror with a reflecting surface as a concave surface, a primary mirror shade tube and a secondary mirror shade tube sleeved at the outer edge of the secondary mirror. The primary mirror and the secondary mirror are arranged sharing a common optical axis mode, the primary mirror is provided with a central round hole; the primary mirror shade tube is located at the central round hole of the primary mirror; the periphery of the secondary mirror shade tube is provided with an additional light-extinction barrel for preventing a light beam from passing through the central round hole of the primary mirror from a gap between the primary mirror shade tube and the secondary mirror shade tube to enter an image surface; the space surrounded by walls of the additional light-extinction barrel is in a cylindrical shape, the axis of the additional light-extinction barrel and the optical axis of the primary mirror or the secondary mirror are overlapped, and the wall of the additional light-extinction barrel is parallel to the optical axis. In the invention, only one light-extinction barrel is added, the complete interception for light leakage in a system is realized, the weight and the volume of the whole system are greatly reduced, the load is reduced, the applicability is strong, the structure is simple and the design is convenient.

Description

technical field [0001] The invention relates to a Cassegrain and its improved imaging system, in particular to a Cassegrain with a stray light eliminating device and its improved imaging system. Background technique [0002] The Cassegrain system is a coaxial reflective system that can obtain a relatively long focal length with a relatively short overall length. It consists of two reflectors, called the primary mirror and the secondary mirror, such as figure 1 shown. The primary mirror is a paraboloid or an approximate paraboloid, and the secondary mirror is a hyperboloid. The light from the object side is first reflected by the primary mirror, then reflected by the secondary mirror and passes through the central opening of the primary mirror to reach the image plane for imaging. [0003] Such as figure 1 The shown Cassegrain system can only perfectly image the on-axis light, and the imaging of the off-axis light will have obvious aberrations even if the field of view is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B17/06
Inventor 岑兆丰李晓彤徐之海冯华君李奇
Owner ZHEJIANG UNIV
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