Reel table revolution detector for use in a video cassette recor

Details Reel table revolution detector for use in a video cassette recor Reel table revolution detector for use in a video cassette recor

1993-09-09

1996-09-17

Sikes, William L.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 534, H01J 314

Patent

active

055571018

ABSTRACT:
The detector comprises a disc-like reel table adapted to support a tape reel thereon, the reel table having a reflective underneath surface and an array of concentric spaced-apart cutouts uniformly disposed on the reflective surface along a common imaginary circle whose center coincides with a rotational axis of the tape reel, each of the cutouts having a light scattering surface capable of reducing the intensity of a light beam incident thereupon to an appreciable level. A light emitter is located in an opposing relationship with respect to the reel table for projecting the light beam toward the reflective underneath surface and the light scattering surface of the reel table. Positioned adjacent to the light emitter is a light receiver for receiving the light beam reflected back from the reel table to produce a pulse signal when the intensity of the received light beam varies over time in a pulse pattern.

REFERENCES:
patent: 5061848 (1991-10-01), Choi

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