Reel to reel tape radius measurement apparatus and method therefor
US4814673A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 19, 1988 |
| Grant date | Mar 21, 1989 |
| Priority date | — |
| Expiry date | Apr 19, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B15/54
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a reel to reel tape transport system for determining the radii of the reel to reel tape by generating a series of forward and reverse pulses from a brushless DC motor driving the reel to reel tape, generating a forward series of pulses when said tape is turning in the forward direction and a reverse series of pulses when the tape is turning in the reverse direction, using a state machine to determine a forward or reverse revolution of the tape despite tape reversals before the completion of the revolution, and a counter and decoder for decoding the output of the state machine to provide an accurate determination of one revolution of the brushless DC motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.