Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Reexamination Certificate
2005-04-26
2005-04-26
Luu, Thanh X. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
C360S074600, C242S333200
Reexamination Certificate
active
06885018
ABSTRACT:
An object of this invention is to reduce the manufacturing cost by simplifying a reel rotation detecting mechanism in a video cassette deck. A light emitting element and a light receiving element are engaged on a main substrate provide under a deck chassis. On the deck chassis is mounted a light guiding member that includes a pillar portion extending through the deck chassis and a branch portion extending sideways from the pillar portion. In order to detect the leading ends and trailing ends of the magnetic tape, the pillar portion guides the light coming from the light emitting element into the cassette arranged on the deck. The branch portion, above the deck chassis, guides one portion of the light incident to the pillar portion to the reel on the deck chassis. The rotation of the reel is detected by receiving the light by the light receiving element on the main substrate through the opening point provided in the reel and the opening provided in the deck chassis.
REFERENCES:
patent: 3619625 (1971-11-01), Wood
patent: 5311030 (1994-05-01), Higuchi et al.
Funai Electric Co. Ltd.
Greenspan, Esq. Myron
Lackenbach & Siegel LLP
Luu Thanh X.
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