Electroacoustic device for reading an optical image in two dimensions
US4085348A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 14, 1976 |
| Grant date | Apr 18, 1978 |
| Priority date | — |
| Expiry date | Dec 14, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N3/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A device for the electrical line-by-line analysis of an optical image in two dimensions. It comprises a piezoelectric medium associated with a semiconductive medium onto which the image is projected, and at least three transducers emitting surface elastic waves on the piezoelectric medium. Two of three transducers emit pulses in two separate directions, the convergence point of which constitutes a reading point of the image. This point moves as a function of time along a straight line which constitutes an analysis line of said image. The third transducer emits a long wave, the wave vector of which is such that the wave vector resulting from the interaction of the three waves is zero.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.