Capacitance sensor for detecting the position of magnetic rotati

Details Capacitance sensor for detecting the position of magnetic rotati Capacitance sensor for detecting the position of magnetic rotati

1987-12-21

1990-03-20

Richardson, Robert L.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360109, 360 7713, G11B 2102, G11B 553

Patent

active

049106155

ABSTRACT:
A device for detecting the position of a recording/read head (20) for use with a magnetic tape, the head being fixed to the free end of an elongate support (14) fixed to a component (5) which is mounted to rotate in a slot (4) provided in an equatorial plane of a cylindrical drum (1) on whose outside surface the recording tape is wound helically. Said support is capable of bending in a direction (f) which is transverse to the direction of relative head-to-head tape displacement. The device is characterized in that it includes a position sensor comprising a variable electrical capacitance including a fixed plate (32) fixed to the drum (1) of the moving plate (24) fixed to said head support, together with measurement means (33, 34, 35.sub.i) which are sensitive to said capacitance and are suitable for providing a signal representative of the position of the head support (14) and thus of the head (20).

REFERENCES:
patent: 3783196 (1974-01-01), Stanley
patent: 4163994 (1979-08-01), Sakamoto et al.
patent: 4183060 (1980-01-01), Barnette
patent: 4404605 (1983-09-01), Sakamoto
patent: 4412259 (1983-10-01), Hiraguri
patent: 4471392 (1984-09-01), Zorbalas
"Slider Assembly with Dynamically Positionable Transducer", Research Disclosure, No. 264 (Apr. 1986): 214, 215, Emsworth, Hampshire.
"Capacitive Height Control for Maintaining a Magnetic Head Closely Spaced from a Magnetic Layer", Research Disclosure, No. 206 (Jun. 1981): 242, 243, Havent, Hampshire, England.
Klaassen, "Capacitive Servo Detector", IBM Technical Disclosure Bulletin, vol. 26, No. 6 (Nov. 1983): 2942-2946.

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