Reel sensor and start/finish end detecting device

Details Reel sensor and start/finish end detecting device Reel sensor and start/finish end detecting device

1997-09-05

2000-07-25

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25055929, 360 742, 360 741, 242333, G11B 1518

Patent

active

060939257

ABSTRACT:
In a reel sensor for a start/finish and detecting device in which a light from a light-emitting element is radiated into an incident light window formed in a video cassette and a start/finish end of a video tape is detected based on an intensity of a light radiated from an emergent light window formed in the video cassette, the reel sensor comprises: a light-distributing section for distributing the light radiated from the light-emitting element to a rotation indicator so as to correspond to the rotation of a reel stand, the rotation indicator serving to change an intensity of the light either transmitting therethrough or being reflected thereby; and a light-receiving section for receiving the ray of light having been distributed by the light-distributing section and either having transmitted through the rotation indicator or having been reflected by the rotation indicator.

REFERENCES:
patent: 5311030 (1994-05-01), Higuchi et al.
patent: 5517480 (1996-05-01), Matsuoka et al.
patent: 5519675 (1996-05-01), Toofan
patent: 5600504 (1997-02-01), Seo
patent: 5625516 (1997-04-01), Kushiro
patent: 5659435 (1997-08-01), Han
patent: 5729006 (1998-03-01), Maeda
patent: 5775615 (1998-07-01), Ahn

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