The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 13, 1990
Filed:
May. 03, 1988
Applicant:
Inventors:
Yutaka Masuda, Hirakata, JP;
Norio Okutani, Neyagawa, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01D / ; H01J / ;
U.S. Cl.
CPC ...
2502 / ; 2502 / ;
Abstract
A reference signal generation apparatus for a position detector is disclosed in which a plurality of signals having peaks at predetermined intervals are produced from the light transmitted through slit rows of random patterns and a plurality of light detectors for detecting the same light, thereby producing a reference signal in the vicinity of maximum and minimum values of the difference signal between the output signals of the light detectors.