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. 25, 1997
Filed:
Apr. 13, 1995
Applicant:
Inventors:
Assignee:
Sumitomo Rubber Industries, Ltd., Kobe, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01P / ; A63B / ;
U.S. Cl.
CPC ...
324178 ; 423221 ; 423409 ;
Abstract
An apparatus and a method for measuring head speed and an opening angle. At least four sensors are disposed at each vertex of a defined rectangle. An instrumentation device measures differences in time between instants in which a moving head intercepts rays of light toward the sensors, respectively. An arithmetic unit calculates head speed and an opening angle on the basis of the measured time differences.