U.S. Philips Corporation

Franciscus J Verhallen

Rudolf A Van Doorn

Abraham Hoogendoorn

Gerardus W Akkermans

Stephanus J Van Beckhoven

A device for recording an information signal on a magnetic record carrier (2) includes a write amplifier (3), a magnetic head (4) of the magnetoresistive type, and a compensation circuit for controlling the amplitude of the write current in dependence upon temperature variations which occur during recording. The compensation circuit includes an actuator for bringing the record carrier into contact with the magnetic head (4) before a recording is started. In addition, detector means (17, 18) is provided to detect an output signal of the magnetic head produced as a result of the magnetic head being brought into contact with the record carrier. A control signal generator (17) generates a control signal whose magnitude is a measure of the magnitude of the output signal. The compensation circuit (3, 5, 8, 11, 17) is adapted to control the amplitude of the write current in dependence upon the control signal.

Recording device with temperature-dependent write-current control

A device for recording an information signal on a magnetic record carrier comprises a recording amplifier (3), a magnetic head (4), and a controller for controlling the write current amplitude in dependence on temperature variations which occur during recording. This is effected by a temperature detector. The magnetic head (4) has a write section (5) for recording an information signal on the magnetic record carrier in a recording mode of the device, and a read section (6) for reading an information signal from the record carrier in a playback mode of the device. The read section (6) is of the magneto-resistive type. The temperature detector is formed by the read section.

Growing community of inventors

Eindhoven, Netherlands

Franciscus J Verhallen