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:
Nov. 06, 2001
Filed:
Jul. 07, 2000
Ken Mizuta, Miyagi-ken, JP;
Hironori Kato, Miyagi-ken, JP;
Toshiyuki Hoshi, Miyagi-ken, JP;
Yoshio Sanpei, Miyagi-ken, JP;
Alps Electric Co., Ltd., Tokyo, JP;
Abstract
A steering angle detecting mechanism of this invention comprises: a plurality of photocouplers for detecting a steering angle of a steering wheel; a timer circuit for setting time; a first power source control unit which is controlled by the set time of the timer circuit and intermittently drives one of the plurality of photocouplers; a second power source control unit for driving the rest of the plurality of photocouplers; a wake-up circuit for generating a wake-up signal when a detection value of the single photocoupler is different from the immediately preceding detection value of the single photocoupler; and a micro control unit which is switched between a sleep mode and a wake-up mode. The micro control unit is switched to the sleep mode when an ignition switch is turned off, and to the wake-up mode for predetermined time when the wake-up signal is supplied, in the sleep mode, the micro control unit intermittently drives the single photocoupler at predetermined intervals and allows the wake-up circuit to generate the wake-up signal on the basis of the detection value of the single photocoupler, and in the wake-up mode, the micro control unit drives the plurality of photocouplers, detects a steering angle on the basis of detection values of the plurality of photocouplers, and stores the detection result.