Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1998-01-22
2000-08-15
Le, Que T.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
360 742, G01D 534
Patent
active
061040231
ABSTRACT:
A reel sensor for detecting the number of rotations or the rotation condition of a tape winding reel employed in a video cassette recorder, for example. The reel sensor includes a light conductive element formed of a light transmissible material and including a base portion mountable on a printed circuit board and a pair of light conductive portions respectively erected on the base portion. Further, two element storage pockets are formed separately in the base portion in such a manner that they respectively correspond to the two light conductive portions, and two reflecting surfaces are formed respectively in the end portions of the two light conductive portions for reflecting and entering the light passing through one of the two light conductive portions into the other light conductive portion. Furthermore, a light shield member for shielding the light between the two element storage pockets is disposed in the base portion.
REFERENCES:
patent: 4638154 (1987-01-01), Itsuki et al.
patent: 5569912 (1996-10-01), Turk et al.
Funai Electric Co. Ltd.
Le Que T.
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