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:
Sep. 20, 2005
Filed:
Jun. 03, 1999
Tatsuo Hayashi, Saitama, JP;
Yoshiaki Hirakata, Saitama, JP;
Tatsuo Hayashi, Saitama, JP;
Yoshiaki Hirakata, Saitama, JP;
A Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A rotation-angular-position detecting apparatus of a rotor is capable of confirming an angular position of a rotation of the rotor within a relatively short period of time following a start of the rotation. The rotation-angular-position detecting apparatus includes a second rotor which rotates in a rotation interlocked with a first rotor with a plurality of first detection members formed at equal intervals in a rotational direction of the first rotor at a predetermined speed ratio with respect to the first rotor, and has a plurality of second detection members formed at unequal intervals in a rotational direction of the second rotor. A second pickup is provided for generating a second detection signal when sensing the proximity of any one of the second detection members on the second rotor. In the rotation-angular-position detecting apparatus, generation of the second detection signal from the second pickup is detected for each generation of the first detection signal from the first pickup due to a rotation of the first rotor. A plurality of specific rotation angular positions of the first rotor are each determined in accordance with a plurality of results of detection obtained so far including a result of the detection of the generation of the second detection signal obtained this time. The number of times the first detection signal is generated after any one of the specific rotation angular positions has been determined is counted to determine a rotation angular position of the first rotor other than the specific rotation angular positions.