A structural design method of a primary stray light shading shield in an optical system
A technology of optical system and structural design, which is applied in the direction of optics, optical components, and optical filters for photography, etc. It can solve the problems of increased weight of the optical system, inability to meet the requirements of the optical system to eliminate primary incident stray light suppression, and high difficulty in assembly.
Active Publication Date: 2022-05-13
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology
[0006] The present invention solves the problems that the weight of the optical system is increased, the assembly difficulty is high, and the optical system cannot meet the suppression requirements of the primary incident stray light in the existing design of the light blocking ring, and provides a structural design of the primary stray light elimination shading cover in the optical system method
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[0031] combine figure 1 Describe this embodiment mode, a kind of calculation method of equidistant and equal-height halo-cone shading structure, the concrete steps of this method implementation are as follows:
[0032] Step 1. Set the radius of the optical aperture at the entrance as a, and the semi-aperture of the light shield as a + , the axial spacing between the light blocking rings is d, the total number of light blocking rings is M, that is, the total length of the light shield is Md. θ 0 is the stray light suppression angle of the hood, ω is the field of view angle of the optical system, and here the angle θ 0 and ω are both positive numbers, and d is a negative number.
[0033] The variable to be optimized is a + , D, M.
[0034] Using the general idea of discrete ergodic sampling, when determining the stray light suppression angle θ 0 Afterwards, a is given based on engineering experience + and the range of values of d, matrix discrete sampling is performed...
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A structural design method for a primary stray light shading cover in an optical system, which relates to the technical field of optical system design, and solves the problem of increased weight of the optical system and high difficulty in assembly in the existing design of the light blocking ring, and cannot meet the requirements of the primary incident stray light elimination of the optical system To suppress the problem of requirements, set the radius value of the optical aperture at the entrance, the semi-aperture of the hood, the axial distance between the light blocking rings, the total number of light blocking rings, the total length of the light hood, the stray light suppression angle of the light hood, and the optical system viewing angle. Field angle; after determining the stray light suppression angle, perform matrix discrete sampling on the semi-aperture of the hood and the axial distance between the light blocking ring; determine the range of incident light rays; calculate the value range of the intersection point that meets the conditions; record The number of rays that cannot meet the conditions at this incident angle; realize the stray light elimination design. The light shield structure calculated by the present invention has equal heights and equal intervals to block light rings, which solves the problem that the light shield structure is complex, difficult to process and difficult to assemble in engineering applications.
Description
technical field [0001] The invention relates to the technical field of optical system design, in particular to a structural design method of a shading cover for eliminating primary stray light in an optical system. Background technique [0002] In an optical system, stray light usually refers to the non-imaging light that reaches the image plane of the optical system, which is equivalent to the "noise" of the optical system. It has a very obvious impact on the star point of the camera, which can greatly reduce the contrast of the image plane and deteriorate the clarity; when the noise caused by stray light radiation is serious, it will even cover the target signal. Therefore, the design of stray light suppression is one of the key technologies of imaging cameras, and the commonly used method is to design a hood for the camera to suppress the influence of stray light. [0003] Generally, the design of the hood is divided into shape design and light blocking ring design. The ...
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IPC IPC(8): G02B27/00G03B11/04
Inventor 王玮鹭王维
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI