Code disk with a plurality of tracks having different patterns

Details Code disk with a plurality of tracks having different patterns Code disk with a plurality of tracks having different patterns

2007-02-15

2009-11-03

Epps, Georgia Y (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C356S617000, C250S231180

Reexamination Certificate

active

07612331

ABSTRACT:
A code disk for a high-resolution encoder that can detect an absolute position and a method for manufacturing a mold to produce the code disk are provided. The code disk is formed by using transparent substrate. The code disk includes a plurality of tracks provided on the transparent substrate and an area provided between the plurality of tracks. Each surface of the plurality of tracks has a different pattern. A level of the area is different from that of the each surface of the plurality of tracks. The method for manufacturing the mold includes steps of processing a plurality of tracks with a flat surface on material; processing an area with a level different from that of each surface, between the plurality of tracks; forming different patterns on the each surface; plating the first material; and peeling plating from the first material to obtain a mold.

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Japanese Office Action for JP 2005-107752, dated Oct. 21, 2008.

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