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:
Apr. 05, 1977
Filed:
May. 06, 1974
Seiichi Matsumoto, Yokohama, JA;
Kazuya Hosoe, Machida, JA;
Canon Kabushiki Kaisha, Tokyo, JA;
Abstract
A level detection system and a servo system employing the level detection system are disclosed. The level detection and servo system employs the use of a reasonably broad band-pass characteristic to avoid criticality in narrow band-pass systems. The level detection system includes an input level comparison circuit responsive to an input signal having a recurrent frequency and a reference signal. A filter having a band-pass characteristic which will pass the recurrent frequency of the input signal and its side-bands is responsive to the input level comparison circuit. The output of the filter is coupled to a second comparison circuit. The second comparison circuit is employed as a control means to drive the servo motor in the servo system.