Electronic musical instrument keyboard apparatus
US7709718B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 3, 2008 |
| Grant date | May 4, 2010 |
| Priority date | — |
| Expiry date | Jul 8, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10H1/346
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.