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. 25, 1978
Filed:
May. 12, 1975
Tsuyoshi Kawanabe, Yokohama, JA;
Minoru Machida, Tokyo, JA;
Canon Kabushiki Kaisha, Tokyo, JA;
Abstract
A signal generator generates different input signals when the keys are depressed. The signal generator comprises an input signal generating circuit and a double-key-depression detecting circuit. The input signal generating circuit includes a shift register having a plurality of shift stages and the associated output lines, signal lines for transmitting signals which may be sequentially derived from the output lines of the shift stages, and a discriminator for discriminating through which signalline is transmitted the signal. Each output of the shift stages of the shift register provides one information representative of a depressed key. Output of the discriminator provides another information representative of a depressed key. The input signal is identified by the combination of two kinds of the information.