Method for machining off-axis aspherical mirror

An off-axis aspheric surface and processing method technology, which is applied to the processing field of off-axis aspheric mirrors, can solve problems such as low efficiency of workpiece edge processing, and achieve the effects of increasing processing difficulty and overcoming slow error convergence.

Active Publication Date: 2016-06-22
苏州普锐仕精密光学科技有限公司
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Problems solved by technology

[0007] The purpose of the present invention is to provide a processing method for off-axis aspheric mirrors, which is used for processing concave quadratic aspheric mirrors with conic constant K<0. It does not need to rely on high-precision and complicated inst

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  • Method for machining off-axis aspherical mirror
  • Method for machining off-axis aspherical mirror
  • Method for machining off-axis aspherical mirror

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Embodiment

[0036] Example: see attached Image 6 As shown, the shape of the off-axis aspheric surface as shown in the off-axis aspheric mirror body 18 in the figure, its structural parameters: radius of curvature R=407.6mm, conic constant K=-0.48, diameter of the arc side wall of the off-axis mirror is 120mm, The distance between the parallel side walls of the off-axis mirror is 86mm, and the off-axis distance is 30mm. According to the structure of the off-axis mirror body, the diameter of the rotating parent body is 230mm, and the through hole 14 for inlaying the daughter body structure is excavated on the blank of the rotating aspheric surface parent body 13; the blank of the off-axis aspheric mirror body 18 is placed in the through hole In the hole 14, an off-axis aspheric mirror body and a rotating aspherical parent body are combined into a cylindrical integral workpiece by using an optical adhesive; the initial spherical surface 5 for processing the rotating aspheric surface is proc...

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Abstract

The invention discloses a method for machining an off-axis aspherical mirror. The method comprises the steps that 1, a rotary aspherical matrix structure is designed; 2, a through hole for inlaying of a daughter structure is excavated in a matrix blank; 3, a cylindrical integral workpiece is formed by combining a matrix and a daughter; 4, an initial spherical surface is machined; 5, grinding is guided through the surface shape error detecting result of a contourgraph, and the surface shape error between the initial spherical surface and a rotary aspheric surface is corrected; and 6, polishing is guided through the surface shape error detecting result of an interferometer or knife-edge tester, and the off-axis aspherical daughter is taken out after polishing is completed. The method is characterized in that the caliber D of the initial spherical surface is equal to the diameter of a cylinder of the integral workpiece, and the curvature radius R of the initial spherical surface is equal to the radius of a circumcircle of a triangle formed by a vertex in a rotary aspheric bus equation and a first point and a second point which are located at the position with the caliber of 1.414 D on a rotary aspheric bus. According to the method, the problem of the influence of the fringe effect in the prior art is solved, the efficiency of aspherical surface machining is improved, and machining difficulty is reduced.

Description

technical field [0001] The invention relates to a processing of an optical element, in particular to a processing method of an off-axis aspheric mirror. Background technique [0002] In the prior art, the optical system using the off-axis aspheric mirror structure has the characteristics of fewer components, no obstruction, long focal length, large field of view, wide band, strong ability to suppress stray light, and high modulation transfer function. It is a space optical system, astronomy and Indispensable optics for high-precision measurement systems. The three-mirror reflection system is its most typical application. As the core component of the space telescope, it can avoid central occlusion, reduce the volume and weight of the system, and improve the imaging quality of the system at the same time. In view of the above advantages, research and development of new aspheric optical element processing technology has always been an important task in the field of optical pro...

Claims

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Application Information

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IPC IPC(8): B24B1/00B24B13/00B24B13/01B24B13/005
CPCB24B1/00B24B13/00B24B13/005B24B13/01
Inventor 郭培基陈曦范建彬
Owner 苏州普锐仕精密光学科技有限公司
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