Record confirmation apparatus
US4740942A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jan 7, 1985 |
| Grant date | Apr 26, 1988 |
| Priority date | — |
| Expiry date | Jan 7, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B27/36
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A record confirmation apparatus comprises a recording device for recording information on a disc-like record bearing member rotated at a predetermined angular speed, in accordance with a writing signal, a reproducing device disposed at a predetermined distance from the recording device in the tangential direction of the record bearing member for reproducing the recorded information as a read-out signal, and a comparing device for delaying the writing signal and comparing it with the read-out signal, the comparing device having a variable delay circuit for varying the delay time in conformity with the relative position of the recording device and the reproducing device relative to the record bearing member in the radial direction of the record bearing member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.