Title:
PHOTOELECTRIC ENCODER
Document Type and Number:
Japanese Patent JP3256109
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a photoelectric encoder that can correctly detect moving information.
SOLUTION: A photoelectric encoder is provided with a light emitting element and a light receiving element disposed opposedly to each other, and a moving body X having a plurality of slits X1, X2, X3,... formed and passing between the light emitting element and the light receiving element. The light receiving element has photodiodes Pd1-Pd4 serving as a first light receiving part of 1/2 pitch P in the array direction width of the slits X1, X2, X3,..., and a photodiode Pd5 serving as a second light receiving part of a 2 pitches P in the array direction width. A pair of photodiodes Pd1, Pd2 and a pair of photodiodes Pd3, Pd4 are shifted by 3/4 pitch P mutually in the array direction and arranged symmetrically with respect to the center O where the optical axis of light from the light emitting element passes. The photodiode Pd5 is disposed symmetirically with respect to the center O so as to be overlapped with an area between the photodiodes Pd1, Pd2 and an area between the photodiodes Pd3, Pd4.
More Like This:
| WO/2004/074780 | POSITION DETECTING UNIT |
| JPH08168210 | ENCODER UNIT, CONTROL MOTOR, AND ASSEMBLY OF CONTROL MOTOR |
Inventors:
Minoru Ohnishi
Application Number:
JP24586895A
Publication Date:
February 12, 2002
Filing Date:
September 25, 1995
Export Citation:
Assignee:
Sharp Corporation
International Classes:
G01D5/36; G01D5/244; G01D5/245; G01P3/486; H01L27/14; (IPC1-7): G01D5/36; G01D5/245; G01P3/486; H01L27/14
Domestic Patent References:
| JP62150118A | ||||
| JP727574A | ||||
| JP60515U | ||||
| JP267219U |
Attorney, Agent or Firm:
Aoyama Ryo (1 person outside)