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Patent Searching and Data


Title:
ENCODER
Document Type and Number:
Japanese Patent JPH07167677
Kind Code:
A
Abstract:

PURPOSE: To provide an encoder in which a reduction in a cost of a product, a light weight and a compact structure can be realized by simple means.

CONSTITUTION: An encoder has a light emitting element 3 and a light receiving element 4 oppositely disposed above and below a disc 11 to detect a rotating amount of the disc 11 upon reception of presence or absence or an emitted light L from the element 3, and comprises many microlenses 12 formed between the oppositely disposed elements 3 and 4 to convert the light L emitted from the element 3 toward the element 4 into parallel beam light L'. The microlens 12 is formed simultaneously by obtaining the disc 11 by molding a transparent material such as plastic, etc., by injection molding, etc., in a disc state.


Inventors:
OKADA MAKOTO
Application Number:
JP31461693A
Publication Date:
July 04, 1995
Filing Date:
December 15, 1993
Export Citation:
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Assignee:
NIPPON HIKYUMEN LENS KK
International Classes:
G01D5/36; G01D5/34; G01D5/347; G02B3/00; (IPC1-7): G01D5/36; G01D5/34; G02B3/00
Domestic Patent References:
JPS6378021A1988-04-08
JP3080325B
JPS618667A1986-01-16
JPH04115122A1992-04-16
Attorney, Agent or Firm:
江原 省吾 (外2名)