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:
Feb. 22, 2011
Filed:
Apr. 07, 2006
Tetsuya Hirano, Hamamatsu, JP;
Tetsuya Hirano, Hamamatsu, JP;
Kabushiki Kaisha Kawai Gakki Seisakusho, Shizuoka-ken, JP;
Abstract
There is provided a touch detecting device of a keyboard instrument, which makes it possible not only to enhance the mounting density of a plurality of optical sensors, but also to detect touch information of a key with high accuracy without being affected by light from the other optical sensors. The touch detecting device comprises a shutterthat moves in accordance with pivotal motion of a key, a plurality of optical sensorsandthat are provided close to a pivotal path of the shutterand have respective light emitting partsandand respective light receiving partsandfor receiving light emitted from the light emitting parts, on respective opposite sides of the pivotal path, and touch information detecting meansfor detecting, as the keypivotally moves, the touch information based on presence or absence of light received by the light receiving parts of the optical sensorsandin accordance with opening or closing of optical paths of light from the light emitting parts of the optical sensorsand, by the shutter. Adjacent two of the optical sensorsandare arranged such that the light emitting part of one of the two and the light receiving part of the other of the two disposed adjacent to each other on the same side of the pivotal path of the shutter