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:
Mar. 24, 1987
Filed:
Oct. 31, 1985
Kyocera Corporation, , JP;
Abstract
A reading apparatus including a first group of photo-detection units, the first group of photo-detection units including a first plurality of photo-detection units each including a photo-detector constituted by a photodiode and an electric charge storage capacitor connected in parallel therewith, and an analog switch connected in series with the photo-detector thus constituted, a second group of photo-detection units, the second group of photo-detection units including a second plurality of photo-detection units each also including a photo-detector constituted by a photo-diode and an electric charge storage capacitor connected in parallel therewith, and an analog switch connected in series with the photo-detector thus constituted, the second plurality of photo-detection units being substantially equal in number to the first plurality of photo-detection units, a control system for rendering the switches conductive successively one at at time, a first common line for commonly delivering detecting signals from the first group of photo-detection units, a second common line for commonly delivering detecting signals from the second group of photo-detection units, an operational amplifier circuit having a pair of input terminal, one input terminal thereof being supplied with the detecting signals sent from the first common line, while the other input terminal thereof being supplied with the detecting signals sent from the second common line, the operational amplifier circuit being adapted to sum up the detecting signal given to the one input terminal thereof and the inverted signal of the detecting signal given to the other input terminal thereof.