Apparatus for controlling the tension of a cassette tape
US4429261A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 4, 1981 |
| Grant date | Jan 31, 1984 |
| Priority date | — |
| Expiry date | Dec 4, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B15/46
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A tape tension sensor is provided to produce an electrical signal indicative of the tension of the running tape of a compact cassette in a tape recorder, and this signal is processed to derive a high frequency component representing the variation in tape velocity. A tape-contactable member is driven by a control signal which is produced on the basis of the high frequency component. In a first embodiment, the tape-contactable member is electromagnetically operated by the control signal so that the member damps or absorbs the vibrations of the tape in the vicinity of the record/reproduce head. A low frequency component may also be derived from the sensor output to produce a second control signal. In the first embodiment, the second control signal is fed to a payoff reel drive motor so that the rotational speed of the payoff reel is controlled to maintain the tension of the tape constant. In a second embodiment, the high frequency component and the low frequency component are added to each other to produce a single control signal which is fed to a motor for driving an upstream capstan of a dual-capstan type tape recorder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.