Optical metronomes
US4163409A · kind A · utility
3Cited by
6References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 9, 1977 |
| Grant date | Aug 7, 1979 |
| Priority date | — |
| Expiry date | Dec 9, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04F5/025
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An optical metronome using sheets of music of non-sagging sheets of translucent material with notes spaced according to their value and vertically aligned measures on a display panel of light columns formed of vertical bars of triangular cross-section in white reflectors with an angular air gap and a light source for each bar. Circuitry coordinates sequential lighting of the bars in proper musical tempo and properly placed downbeat and is also attached or attachable to electronic organ circuitry or stands alone with automatic turn-off of lights to the bars if organ not counting.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.