Video signal reproducing apparatus with tape tension control arrangement
US4390909A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 24, 1980 |
| Grant date | Jun 28, 1983 |
| Priority date | — |
| Expiry date | Dec 24, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B15/43
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video signal reproducing apparatus of the helical scan type includes a guide drum having a magnetic head fixed thereto for scanning a magnetic tape wrapped about the guide drum, first and second capstan assemblies on opposite sides of the guide drum for moving the tape in a desired mode of operation, a manually rotatable wheel for controlling the speed and direction of movement of the tape in a track searching mode, signal generating apparatus for producing a speed pulse signal having a frequency corresponding to the speed of rotation of the wheel, a flip-flop for producing a direction signal corresponding to the direction of travel of the wheel, a tape tension detector engaging the magnetic tape for detecting the amount of tension on the magnetic tape at a point adjacent the guide drum, a pulse control circuit for producing take-up and supply drive clock pulses in accordance with the amount of tension detected by the tape tension detector and the speed pulse signal, and take-up and supply capstan drive circuits for controlling operation of the first and second capstan assemblies, respectively, in response to the direction signal, the speed signal, and the take-up and supply driv…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.