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:
Jul. 29, 1997
Filed:
Jun. 28, 1996
Applicant:
Inventors:
Yuji Fujiwara, Shizuoka-ken, JP;
Taro Kawabata, Shizuoka-ken, JP;
Yasuhiko Oba, Shizuoka-ken, JP;
Shigeru Muramatsu, Shizuoka-ken, JP;
Yoshimasa Isozaki, Shizuoka-ken, JP;
Jun Ishii, Shizuoka-ken, JP;
Assignee:
Yamaha Corporation, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G10F / ;
U.S. Cl.
CPC ...
84 21 ; 84 22 ; 84462 ; 84601 ; 84DI / ;
Abstract
An automatic player piano controls keys to be rotated by solenoid-operated actuator units in such a manner as to pass a reference point on a trajectory of the key at a reference velocity in a playback mode, and a hammer driven by the depressed key strikes strings at the same intensity as that in a recording mode, because the intensity is variable with the reference velocity at the reference point.