Victor Company of Japan, Limited

Mitsuhiro Arai

Yasuomi Namiki

Eiichi Tsuchiya

Satoshi Kawasaki

Tetsuo Ikeda

A cassette discriminating apparatus incorporated in a magnetic recorder for discriminating between a first cassette and a second cassette. The discriminating apparatus includes a supply reel drive for rotating the supply reel of the first cassette or of the second cassette, a take-up reel drive for rotating the take-up reel of the first cassette or of the second cassette, a first sensor for detecting the number of revolutions of each of the supply reel drive and the take-up reel drive, a second sensor for detecting the number of revolutions of a capstan, an arithmetic unit for computing the sum of a first square of the number of revolutions of the capstan per one revolution of the supply reel drive and a second square of the number of revolutions of the capstan per one revolution of the take-up reel drive, based on the outputs from the first and second sensors, respectively, a comparator for comparing the output from the arithmetic unit with a predetermined reference value to discriminate between the first cassette and the second cassette, and a tension control unit for controlling the tape tension according to the result of the discrimination by the comparator.

Magnetic tape loading apparatus

Improvement of a lower cylinder of a drum assembly for a helical scan type magnetic recording/reproducing apparatus, a magnetic tape being wrapped around the drum assembly in a predetermined angular range with respect to its own axis which is wider than a scanning angular range so as to have an additional tape-wrapping angular range on at least a tape-entry portion from which the tape starts to be wrapped around the drum assembly. The lower cylinder integrally has on its outer circumferential surface a tape-guiding portion for guiding the tape on wrapping it around the drum assembly, a tape-wrapping portion on which the magentic tape is wrapped along the tape-guiding portion in a direction substantially coincident with a direction of rotation of the upper cylinder and a protruding portion formed in the additional tape-wrapping angular range so as to be protruded by a predetermined amount with respect to the tape-wrapping portion. The protruding portion initially comes into contact with the tape to be entered onto the drum assembly and has a wedge-like shape in which its top is substantially directed in the tape-travelling direction. The protruding amount of the protruding portion with respect to the tape-wrapping portion being substantially equal to a protruding amount of the magnetic head from an upper cylinder of the drum assembly.

Drum assembly in magnetic recording/reproducing apparatus and

A magnetic recording/reproducing apparatus for magnetically recording and reproducing information on and from a magnetic tape. The apparatus includes a rotary drum adapted to be rotatable about its own axis and having at its circumferential portions a plurality of magnetic heads including at least first and second signal recording/recproducing magnetic heads and one signal erasing magnetic head. In order for coupling between the plurality of magnetic heads and a recording/reproducing circuit of this apparatus, further included is a rotary transformer which is provided between the rotary drum and a stationary portion of this apparatus and which includes first and second transformer coil assemblies coupled to the first and second magnetic heads, respectively, and one erasing coil assembly coupled to the erasing magnetic head. The erasing coil assembly is disposed between the first and second transformer coil assemblies to assume a magnetically neutral position with respect thereto. The recording/reproducing circuit is arranged so that the directions of recording currents through the first and second transformer coil assemblies are in reverse relation to each other, whereby induction currents due to magnetic fluxes produced by the recording currents therethrough are cancelled each other in the erasing coil assembly.

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Yokohama, Japan

Mitsuhiro Arai