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:
Jan. 23, 1990
Filed:
Jul. 25, 1988
Applicant:
Inventors:
Assignee:
Man Design Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01B / ; G08C / ; G08C / ;
U.S. Cl.
CPC ...
324208 ; 34087031 ; 33558 ;
Abstract
In a length measuring apparatus, a measurement probe includes a core and is movable in an axial direction of the probe. First to third coils are arranged in an order in a moving area of the core in accordance with the movement of the probe. In the B-phase, the first and second coils are primary and the second and third coils are secondary. In the A-phase, the second and third coils are primary and the first and second coils are secondary. CPU first sets a switch in the B-phase and then in the A-phase. A moving amount of the core is calculated from secondary voltage data in both the B-phase and the A-phase.