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Grinding processing method for optical spherical lens

A spherical lens and grinding technology, applied in the field of grinding, can solve problems such as excessive machining allowance, surface roughness cannot obtain surface roughness, etc., so as to improve surface roughness, shorten grinding processing time, and realize processing effect of time

Inactive Publication Date: 2007-09-26
HARUCHIKA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, as disclosed in this patent document 1, the surface roughness that can be obtained is about 2 μm, and the surface roughness of about 0.5 μm cannot be obtained, and it is necessary to use a large machining allowance in the next process, that is, the grinding process.

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  • Grinding processing method for optical spherical lens
  • Grinding processing method for optical spherical lens
  • Grinding processing method for optical spherical lens

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Embodiment

[0054] Table 2 is a table showing an example of conditions and results when the present invention is applied to the grinding process of spherical lenses. In this example, the machining allowance in the rough grinding process is set to 1mm. The surface roughness (Rmax) and spherical accuracy (Δh) of the rough grinding process can be improved, and it was confirmed that the machining allowance of the next finish grinding process is only 15 μm. In addition, as a result, the finish grinding process can be set as only one grinding process, and it was confirmed that the machining time is only 20 seconds.

[0055] On the contrary, in the lens grinding method in the prior art, that is, the machining allowance of finish grinding is 30-50 μm, including two processes of grinding process performed by metal bonded grinding wheel and grinding process performed by resin bonded grinding wheel In the case of the internal method, as listed in the last column of Table 2, the processing time for ...

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Abstract

The invention relates to a grinding processing method for optical spherical lens, in which the fine grinding procedure can be used as single procedure to perform rough grinding. The rough grinding for optical spherical lens is performed at the following condition: 1) grinding disc of nucellus swing type performing the rough grinding of the said lens sheet; 2) using diamond tool of #300-#600 (average size : 60 mu m-30 mu m) and more than 50 of concentration ratio as rough grinding tool disc; setting the rotating speed of the said rough grinding tool disc as 2500rpm-3000rpm. Thus, the allowance of the next fine grinding procedure is about below 20 mu m, which can improve the surface roughness and sphere precision of the said rough grinding procedure. The fine grinding is single grinding procedure, which can realize the shortening of the abrasive machining time of the spherical lens and rationalization of the process management.

Description

technical field [0001] The present invention relates to a lens grinding method for grinding an optical spherical lens used in a digital camera, and more specifically, relates to a method for shortening the processing time and simplifying the process by using the fine grinding process as a single grinding process. Grinding method for process management. Background technique [0002] As a method of grinding an optical spherical lens, a method of forming a spherical surface of a cup-shaped grinding wheel is known. For example, the lens spherical surface is processed through three steps of a rough grinding step, a fine grinding step, and a polishing step. As described in Non-Patent Document 1, the necessary machining allowance in each process is 0.5 to 2 mm in rough grinding, 30 to 50 μm in finish grinding, and 10 to 20 μm in grinding. In addition, the surface roughness Rmax is 6 to 10 μm in rough grinding, 0.5 to 4 μm in finish grinding, and 0.01 to 0.02 μm in grinding. Tabl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B24B13/02B24B13/01
CPCB24B13/00B24B13/005B24B13/04B24B27/0084B24B41/061B24B47/12
Inventor 春日洋一
Owner HARUCHIKA
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