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Free-form surface off-axis three-reflector image-space telecentric optical system

A telecentric optical system and off-axis three-mirror technology, applied in optics, optical components, instruments, etc., can solve the problems of increasing the difficulty of system design, difficult conventional rotational symmetric surface correction, etc., to achieve similar quality, small F number, energy The effect of high utilization

Active Publication Date: 2018-06-29
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the system is off-axis, a series of asymmetric aberrations will be generated, which is difficult to correct with conventional rotationally symmetric surfaces
In addition, the image telecentricity of the system also greatly increases the difficulty of system design

Method used

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  • Free-form surface off-axis three-reflector image-space telecentric optical system
  • Free-form surface off-axis three-reflector image-space telecentric optical system
  • Free-form surface off-axis three-reflector image-space telecentric optical system

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Embodiment Construction

[0013] The free-form surface off-axis three-mirror image square telecentric optical system provided by the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0014] see figure 1 with 2 , the embodiment of the present invention provides a free-form surface off-axis three-mirror image square telecentric optical system 100 , including: a main reflector 102 , a primary reflector 104 , a third reflector 106 and an image sensor 108 . The secondary reflector 104 is located on the reflection optical path of the main reflector 102 ; the third reflector 106 is located on the reflection optical path of the secondary reflector 104 ; the image sensor 108 is located on the reflection optical path of the third reflector 106 . The reflection surfaces of the primary reflector 102 , the secondary reflector 104 and the third reflector 106 are all free-form surfaces.

[0015] The optical path of the free-form sur...

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Abstract

The invention relates to a free-form surface off-axis three-reflector image-space telecentric optical system. The system includes a primary reflector, a secondary reflector, a third reflector and an image sensor; the primary reflector is used for reflecting light sent by an object space so as to obtain first reflected light; the secondary reflector is used for performing secondary reflection on the first reflected light to obtain second reflected light; the third reflector is used for reflecting the second reflected light again so as to obtain third reflected light; and the image sensor is used for receiving the third reflected light and performing imaging; the reflection surface of the primary reflector is a quartic polynomial free-form surface; and the reflection surfaces of the secondary reflector and the third reflector are both sextic polynomial free-form surfaces. According to the system, an obstruction-eliminated off-axis reflective structure is adopted, and an image-space telecentric effect can be approximately realized.

Description

technical field [0001] The invention relates to the field of optical system design, in particular to a telecentric optical system with a free-form surface off-axis three-reflection image square. Background technique [0002] The image telecentric optical system means that the exit pupil of the system is located at infinity, which is a kind of optical system with important applications. (1) The image telecentricity of the system can be used to eliminate the change of the system magnification caused by the axial displacement of the image plane. (2) The image square telecentricity of the system can improve the relative illumination of the image plane within the entire field of view. If the system is used in reverse to generate directional lights, the relative illumination across the entire field of view can also be improved. (3) The image square telecentricity of the system can be used to eliminate the color inhomogeneity of the RGB three-color CCD. (4) For CCD or CMOS using...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B17/06
CPCG02B17/0626G02B13/22G02B17/0642G02B27/0977G02B27/58G02B27/64
Inventor 朱钧杨通金国藩范守善
Owner TSINGHUA UNIV
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