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Design method for diamond knife tool for processing Fresnel lens

A diamond tool and Fresnel lens technology, applied in stone processing tools, stone processing equipment, manufacturing tools, etc., can solve the problems of principle processing errors, large loss of light energy, and reduce the optical efficiency of Fresnel lenses, etc., to achieve The effect of eliminating the principle error and reducing the loss of light energy

Inactive Publication Date: 2009-02-18
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0002] Diamond tools with circular arc edges are usually used in ultra-precision turning processing of Fresnel structures. According to the cutting principle, the edge shape of the tool will be copied on the workpiece, which will reduce the optical efficiency of the Fresnel lens, and the tool The larger the radius of the sharp arc, the greater the loss of light energy
[0003] In addition, when the Fresnel lens structure is processed by conventional diamond ultra-precision turning, the spherical surface and aspheric surface structure of the Fresnel lens are completed after interpolation by multiple axes of the machine tool, and there are certain principled machining errors.

Method used

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  • Design method for diamond knife tool for processing Fresnel lens
  • Design method for diamond knife tool for processing Fresnel lens
  • Design method for diamond knife tool for processing Fresnel lens

Examples

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Embodiment 1

[0022] Embodiment 1, combining figure 1 , the design parameters of the Fresnel lens are: focal length f, workpiece diameter D, design light wavelength λ 0 , phase depth factor M, medium refractive index n. According to the related design formula of Fresnel lens:

[0023] Number of belts that can be processed m = ( D 2 ) 2 2 M λ 0 f

[0024] Maximum relief depth h = M λ 0 Δ n 0

[0025] The annulus radius of the mth annulus r m = 2 mM ...

Embodiment 2

[0026] Example 2, combined with figure 2 , image 3 , Figure 4 , Figure 5 , Figure 6 , the present invention a kind of diamond cutter design method of processing Fresnel lens, described diamond cutter parameter design is as follows:

[0027] The design and calculation process of the deflection angle θ: when the tool swing angle is required to process the stepped surface of the outermost ring belt, the radius R of the spherical surface on the ring belt needs to be obtained first. According to the design parameters of the Fresnel lens, the coordinates of each point, A(r max ,0), B(r max-1 , h), C(r max-1 ,0), Then the slope of the line AB k = BC AC . The equation of the straight line FO can be expressed as y = - 1 k x + b , Substitute the coordinates of points k and F to obtain t...

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Abstract

The invention aims to provide a method for designing a diamond tool which is applied to diamond ultra-precision turning Fresnel lenses. When the diamond tool is designed, main parameter needing to be designed are a deflection angle theta, a tool nose angle phi, a tool nose arc radius Rl and a tool nose transition radius Rm. The principle of designing the deflection angle theta is to mainly ensure that interference can not occur when a step surface of an outermost zone is machined. The principle of designing the tool nose angle phi is to ensure that interference can not occur when a joint of a ball of the outermost zone and the step surface on the one hand, and to ensure the strength of a tool nose on the other hand. When the tool nose arc radius Rl and the tool nose transition radius Rm are designed, a main considered factor is that the tool nose arc radius can affect the diffraction efficiency of the Fresnel lenses. The designed diamond tool can realize the machining of the high-precision Fresnel lenses, eliminate principle errors in conventional machining and reduce the light energy loss of a Fresnel lens structure caused by the arc radius.

Description

(1) Technical field [0001] The invention relates to ultra-precision processing technology, in particular to a design method of a diamond tool for processing Fresnel lenses. (2) Background technology [0002] Diamond tools with circular arc edges are usually used in ultra-precision turning processing of Fresnel structures. According to the cutting principle, the edge shape of the tool will be copied on the workpiece, which will reduce the optical efficiency of the Fresnel lens, and the tool The larger the radius of the sharp arc, the greater the loss of light energy. [0003] In addition, when conventional diamond ultra-precision turning processes the Fresnel lens structure, the spherical and aspheric structures of the Fresnel lens are completed after interpolation by multiple axes of the machine tool, and there are certain principled machining errors. (3) Contents of the invention [0004] The object of the present invention is to provide a diamond tool design method for ...

Claims

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Application Information

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IPC IPC(8): B28D1/16
Inventor 周明陈时锦张海军
Owner HARBIN INST OF TECH
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