Hitachi, Ltd.

Yoshitaka Okada

Hiroyoshi Matsumura

Tomishige Yatsugi

Hiroaki Inoue

Susumu Ohtsuka

Kunio Tada

In a magnetic recording and reproducing apparatus, amplitude errors of recording currents respectively supplied to a plurality of rotary magnetic heads are detected, and, in individual periods of sequential scanning of a magnetic recording medium by the plural rotary magnetic heads, the gain of a variable gain amplifier disposed in a signal recording system sequentially supplying an input video signal to the plural rotary magnetic heads is controlled so as to automatically adjust the value of the recording current supplied to each of the rotary magnetic heads.

Magnetic recording and reproducing apparatus with individual correction

Electrodes are provided in the vicinity of the switching region of a carrier injection type optical switch, and carriers are removed rapidly through these electrodes when the switch is turned OFF. As the result, a switching speed is increased.

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Katsuta, Japan

Yoshitaka Okada