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:
Dec. 20, 1988
Filed:
May. 04, 1987
Yasushi Katanuma, Furukawa, JP;
Alps Electric Co., Ltd., , JP;
Abstract
A tracking device has a linear motor having a driving coil, a speed sensor having a detection coil, and a moving member reciprocated in a predetermined range together with the driving coil and the detection coil. The moving member receives a driving force upon application of a current to the driving coil, and the detection coil generates a signal according to the speed of the moving member. The speed sensor includes two coils connected with each other in such a direction as to phase-cancel an induced voltage due to a magnetic field generated by the driving coil; at least one of the two coils is the detection coil. The detection coil and the driving coil are arranged on one side of the moving member in a single unit.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile