Magneto-optic recording/reproducing apparatus
US4951154A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 28, 1988 |
| Grant date | Aug 21, 1990 |
| Priority date | — |
| Expiry date | Jan 28, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/93
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Disclosed is a magneto-optic recording/reproducing apparatus capable of detecting small size defects in a magneto-optic recording disk in the order of tens of microns in size, and capable of reliably compensating for signal defects of a video image recorded on the disk. In the apparatus first and second photodetectors are provided for detecting information signals of two luminous fluxes into which a luminous flux emitted from a laser oscillator is divided by light splitting means. The photodetectors are arranged on the part of light reflected or emitted by the surface of a magneto-optic recording medium when it is irradiated with the luminous flux from the laser oscillator. According to the invention, the signals produced by the photodetectors are processed to produce a highly sensitive defect signal or a plurality of highly sensitive defect signals which may be summed together.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.