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:
Aug. 16, 1988
Filed:
Aug. 22, 1986
Wataru Ichikawa, Tokyo, JP;
Yuji Matsuki, Sayama, JP;
Kabushiki Kaisha SG, Tokyo, JP;
Abstract
On a circumferential side surface of a single cylindrical member constituting a main body of a rotor section are disposed, in parallel, a first pattern which repeats change in the circumferential direction with a predetermined pitch and a second pattern which has a change of one cycle with respect to one circumference. A detection head section which is provided in proximity to the rotor section changes its relation of correspondence to the respective patterns in accordance with rotational position of the rotor section and produces output signals corresponding to the relation of correspondence. A relatively rough absolute value of a rotational position within one rotation is established by an output signal produced in response to the second pattern and its accuracy is established with a high resolution by an output signal produced in response to the first pattern. By disposing the first and second patterns in parallel on the single cylindrical member of the rotor section, the construction of the device can be simplified.