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:
Dec. 25, 1990
Filed:
Feb. 03, 1989
Keisuke Watanabe, Hamamatsu, JP;
Yamaha Corporation, Hamamatsu, JP;
Abstract
A touch response device for an electronic musical instrument includes pressure detector for detecting initial-touch and after-touch of a key. The pressure detector means has two or more response stages that have different response characteristics to key pressure variation. An initial-touch-detector signal is produced when the pressure detecting means is in a first response stage among the response stages, and after-touch-detector signal is produced when the pressure detecting means is in a second response stage among the response stages. According to the invention, initial-touch signal and after-touch signal are generated by the use of one common operation-detector signal produced from the pressure detector means. As a result, the construction of the pressure detecting means is much simplified compared with a conventional touch-response device provided with two separate detectors, one of which detects initial-touch and another of which detects after-touch.