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US 4,362,934 AGranted
Velocity sensing device using opto-electronic switches
AssigneeSyntronics Music Corporation
InventorDavid M. McLey
Life of this patent
Estimating the term…
Abstract
A musical synthesizer keyboard has a plurality of keys mounted so that each key may be displaced along and return along a locus of movement and where during travel in either direction along said locus a key causes a change of state in each of two corresponding optical detectors at spaced locations along said locus. Means are provided for signalling the states of the detectors to other equipment.
Claims10
Keyboard for production of musical notes, comprising:
- a plurality of keys,
- a pair of optical detectors corresponding to each key,
- each key being reversibly movable along a locus relative to said keys, from one end of said locus past a first location on said locus, past a second location to the other end of said locus,
- cooperating means associated with each key and one of said corresponding detectors to cause a change of state of said one of said detectors when said corresponding key moves past a first location on said locus,
- cooperating means associated with each key and the other of said corresponding detectors to cause a change of state of said other of said detectors when said corresponding key moves past a second location on said locus.
2 more elements
Keyboard for production of musical notes comprising:
- a plurality of keys,
- a pair of optical detectors corresponding to each key,
- each key being reversibly movable along a locus relative to said keys, from one end of said locus past a first location on said locus, past a second location to the other end of said locus,
- cooperating means associated with each key and one of said corresponding detectors to cause a change of state of said one of said detectors when said corresponding key moves past a first location on said locus,
- cooperating means associated with each key and the other of said corresponding detectors to cause a change of state of said other of said detectors when said corresponding key moves past a second location on said locus.
2 more elements
Dependencies are inferred from the claim text.