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:
Mar. 07, 2000
Filed:
Nov. 12, 1997
Applicant:
Inventors:
Assignee:
Mitsumi Electric Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ; G11B / ;
U.S. Cl.
CPC ...
360 7811 ; 360 7703 ;
Abstract
A carriage location detector comprises a scale formed on a carriage and having a plurality of slits at a predetermined interval, a photointerrupter including at least one light emitting element and a plurality of light receiving elements arranged opposite to each other with the scale interposed therebetween. The light receiving elements are so that output signals thereof have a phase difference of 90.degree. from one another. A processing circuit is responsive to the output signals from the light emitting elements for carrying out processing, in an initial setting operation, so as to keep voltage waveforms of the output signals within a predetermined range.