US4362934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Velocity sensing device using opto-electronic switches
Assignee: 542435 ONTARIO Ltd
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Filing: 1981-04-08
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Granted: 1982-12-07
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Expires: 2001-04-08
Abstract
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.
Inventors
- 👤 David M. McLey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:27
CPC Classifications
G; G10; G10C; G10C3/00; G10C3/12; G10H; G10H1/00; G10H1/32; G10H1/34; G10H1/344; G10H2220/00; G10H2220/155; G10H2220/265; G10H2220/305; Y; Y10; Y10S; Y10S84/00; Y10S84/07
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
129 words
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.
Claim 2
Dependent Claim
129 words
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.
Claim 3
Dependent Claim
22 words
Keyboard as claimed in claim 1 in combination with circuitry designed to detect and signal the state of each of said detectors.
Claim 4
Dependent Claim
17 words
Keyboard as claimed in claim 1 wherein each of said detectors is a solid state optical switch.
Claim 5
Dependent Claim
17 words
Keyboard as claimed in claim 2 wherein each of said detectors is a solid state optical switch.
Claim 6
Dependent Claim
93 words
Keyboard as claimed in claim 1 including circuitry corresponding to each key connected to detect the state of the corresponding optical detectors and connected to an output line, said circuitry being designed to provide at said output line, a first voltage level when said key is between said one end of said locus and said first location, a second voltage level when said key is between said first location and said second location, and a third voltage level when said key is between said second location and said other end of said locus.
Claim 7
Dependent Claim
93 words
Keyboard as claimed in claim 2 including circuitry corresponding to each key connected to detect the state of the corresponding optical detectors and connected to an output line, said circuitry being designed to provide at said output line, a first voltage level when said key is between said one end of said locus and said first location, a second voltage level when said key is between said first location and said second location, and a third voltage level when said key is between said second location and said other end of said locus.
Claim 8
Dependent Claim
93 words
Keyboard as claimed in claim 3 including circuitry corresponding to each key connected to detect the state of the corresponding optical detectors and connected to an output line, said circuitry being designed to provide at said output line, a first voltage level when said key is between said one end of said locus and said first location, a second voltage level when said key is between said first location and said second location, and a third voltage level when said key is between said second location and said other end of said locus.
Claim 9
Dependent Claim
93 words
Keyboard as claimed in claim 4 including circuitry corresponding to each key connected to detect the state of the corresponding optical detectors and connected to an output line, said circuitry being designed to provide at said output line, a first voltage level when said key is between said one end of said locus and said first location, a second voltage level when said key is between said first location and said second location, and a third voltage level when said key is between said second location and said other end of said locus.
Claim 10
Dependent Claim
129 words
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.
Claim 11
Dependent Claim
129 words
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.
Claim 12
Dependent Claim
93 words
Keyboard as claimed in claim 9 including circuitry corresponding to each key connected to detect the state of the corresponding optical detectors and connected to an output line, said circuitry being designed to provide at said output line, a first voltage level when said key is between said one end of said locus and said first location, a second voltage level when said key is between said first location and said second location, and a third voltage level when said key is between said second location and said other end of said locus.
References Cited (Backward Citations)
US3617627A
Cited
US4301704A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-12-06 | 1986-06-07 | 1986-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-06 | 1990-06-07 | 1990-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-06 | 1994-06-07 | 1994-12-07 | $7700.00 | Window Closed / Lapsed |