Capacitance type pickup stylus and method of producing same

Details Capacitance type pickup stylus and method of producing same Capacitance type pickup stylus and method of producing same

1976-10-28

1978-10-17

Emery, Stephen J.

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

156617SP, 156DIG61, 156DIG65, 17910041G, 274 38, G11B 344

Patent

active

041207424

ABSTRACT:
A stylus for the capacitive pickup of information signals inscribed in a recording medium as a geometrical variation comprises a corundum single crystal rod having two parallel side faces, which are inherently flat and optically smooth, and a thin electrode film coated on one of these two side faces. The electrode film is normal to the c-axis of the crystal, and the longitudinal axis of the rod coincides with one of the a-axes. The rod is formed by the "edge defined film fed growth" method, wherein corundum melt is made to spread as a film over a flat shape-defining surface and a seed crystal is pulled vertically through a capillary so that an elongated crystal is continuously grown. The c-axes of the grown and seed crystals are parallel to the shape-defining surface and normal to the growth direction. Thereby, the rod is formed without the need of machining and abrading steps, other than steps for the shaping of a tip.

REFERENCES:
patent: 2564136 (1951-08-01), Verhegen
patent: 3591348 (1971-07-01), La Belle, Jr.
patent: 3826877 (1974-07-01), Leedom
patent: 3842194 (1974-10-01), Clemens
patent: 3877705 (1975-04-01), Joschko
patent: 3930117 (1975-12-01), Clemens

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