Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1986-09-03
1988-06-14
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250223R, G01N 2186
Patent
active
047513942
ABSTRACT:
An information recording/reproducing apparatus uses a card-like recording medium having an area for information recording and a blank area, the area for information recording having a reflectivity different from that of the blank area. The apparatus includes a head unit for performing at least one of recording and reproduction, an autotracking servo, a stepping motor and the like cooperating to cause the card to reciprocate relative to the head unit, and an abnormal state detect circuit for detecting whether the card is inserted in the apparatus in a normal state. The abnormal state detect circuit includes a photosensing unit consisting of a light-emitting element for emitting light rays onto the card and a light-receiving element for receiving the light rays from the card. The photosensing unit is deviated with respect to a central portion of the card along a direction perpendicular to a reciprocal movement of the card so that the area for information recording is irradiated with the light rays from the light-emitting element upon insertion of the card in the normal state.
REFERENCES:
patent: 3612888 (1971-10-01), Boucher
patent: 4019025 (1977-04-01), Taniguchi et al.
patent: 4114028 (1978-09-01), Baio et al.
patent: 4613942 (1986-08-01), Chen
Aoki Akio
Matsuoka Kazuhiko
Minoura Kazuo
Suzuki Ken'ichi
Allen Stephone B.
Canon Kabushiki Kaisha
Nelms David C.
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