G - Physics – 11 – B
Patent
G - Physics
11
B
352/33.12
G11B 9/06 (2006.01) G11B 19/14 (2006.01) G11B 21/02 (2006.01) G11B 21/12 (2006.01)
Patent
CA 1159558
ABSTRACT OF THE DISCLOSURE An apparatus for detecting the position of a reproduc- ing transducer in an apparatus which reproduces an information signal recorded on a rotary recording medium, the reproducing transducer being transferred in the radial direction across the rotary recording medium, comprises a single photo-detector having a light-emitting element and a light-receiving element, provided in a manner so as to be transferred unitarily with the reproducing transducer, a light interrupting plate located at a fixed part of the rotary recording medium reproducing apparatus, for operating together with the photo-detector, and a position detection signal producing circuit for producing a position detection output signal according to an output of said photo-detector, to indicate that the reproducing transducer has passed a position corresponding to a first predetermined position and a second predetermined position of the recorded region on the rotary recording medium. The light interrupting plate has a configuration so as to change state be- tween a light interrupting state and a non-interrupting state with respect to the photo-detector, as the reproducing transducer pas- ses a position corresponding to the first predetermined position and the second predetermined position of the recorded region on the rotary recording medium.
382700
Abe Ryuzo
Sakurai Masaki
Sugiyama Hiroyuki
Yoshihara Kenji
Yusa Yasuhiro
Marks & Clerk
Victor Company Of Japan Ltd.
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