Invention Grant
- Patent Title: Electronic musical instrument keyboard apparatus
- Patent Title (中): 电子乐器键盘装置
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Application No.: US12167395Application Date: 2008-07-03
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Publication No.: US07709718B2Publication Date: 2010-05-04
- Inventor: Ichiro Osuga
- Applicant: Ichiro Osuga
- Applicant Address: JP Hamamatsu-shi
- Assignee: Yamaha Corporation
- Current Assignee: Yamaha Corporation
- Current Assignee Address: JP Hamamatsu-shi
- Agency: Morrison & Foerster LLP
- Priority: JP2007-176173 20070704
- Main IPC: G10C3/12
- IPC: G10C3/12

Abstract:
Keyboard apparatus includes: a plurality of white and black keys: a plurality of mass body units each pivotable in response to operation of a corresponding one of the keys; a frame having mounted thereon the plurality of keys and mass body units; and upper- and lower-limit stoppers provided on the frame for limiting a pivotable range of each of the mass body units by the mass body unit colliding against the stoppers. Each of the mass body units includes a cavity portion provided in a section thereof that pivots against a gravitational force as the corresponding key is depressed, and a plurality of particles are accommodated in the cavity portion with some vacant space left in the cavity portion.
Public/Granted literature
- US20090007756A1 Electronic Musical Instrument Keyboard Apparatus Public/Granted day:2009-01-08
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