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:
Oct. 22, 1985
Filed:
Apr. 22, 1983
Applicant:
Inventors:
Takashi Yamada, Anjo, JP;
Mamoru Shimamoto, Nagoya, JP;
Assignee:
Nippondenso Company, Ltd., Kariya, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ;
U.S. Cl.
CPC ...
307359 ; 307261 ; 307356 ; 307494 ; 307503 ; 307551 ; 328149 ; 328151 ;
Abstract
A periodic signal detecting circuit including a comparator compares a threshold voltage varying with a time constant and an engine speed signal from an electromagnetic pickup coil so as to generate an output. The time constant is varied in accordance with the switching operation of a diode switch which is turned on and off in accordance with the comparator output. When the switch is in off condition, the threshold voltage is varied with the time constant which is changed successively.