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. 13, 1988
Filed:
May. 11, 1987
Yoshihiro Okui, Daito, JP;
Seiiku Ito, Amagasaki, JP;
Minolta Camera Kabushiki Kaisha, Osaka, JP;
Abstract
An analog to digital converting device which can convert analog input signals individually into digital values of accurately corresponding magnitudes even when there is some difference in the input signals. The device comprises an integrating circuit which includes an operational amplifier for receiving an analog signal, an integrating capacitor connected between an input terminal and an output terminal of the operational amplifier, and a reset switch connected in parallel to the integrating capacitor. The integrating circuit is controlled to first perform an integrating operation and then an inverse integrating operation. A comparator is connected to an output terminal of the integrating circuit. A diode or transistor is connected in parallel to the integrating capacitor for limiting an amount of charge to be accumulated in the integrating capacitor by an inverse integrating operation to below a predetermined value.