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:
May. 06, 1986
Filed:
Jul. 13, 1982
Eiichi Munetsugu, Yokohama, JP;
Hiroshi Ushiki, Yokohama, JP;
Tokyo Shibaura Denki Kabushiki Kaisha, Kawasaki, JP;
Abstract
An input device in use for electronic calculators with a segment type display section of a plurality of digits comprises a key switch matrix supplied with at least some of the signals applied to the segment of the display section, a latch circuit for detecting the key operation and latching the input signal representative thereof, a control section for detecting the required operation according to the input signal from the latch circuit for performing the required operation in accordance with the input signal and for producing a display signal, and a selector gate circuit which supplies the signal containing key-in detection pulse when the key operation is not detected to the segments and the key switch matrix, and sequentially supplies the key-in judging pulse to the key switches on the column lines of the key switch matrix when the key operation is detected.