Method for forming a narrowed-electrode pickup stylus for video

Details Method for forming a narrowed-electrode pickup stylus for video Method for forming a narrowed-electrode pickup stylus for video

1977-03-28

1978-07-04

Smith, Gary L.

Abrasive tool making process, material, or composition

Impregnating or coating an abrasive tool

274 38, 360122, B24B 100

Patent

active

040980308

ABSTRACT:
A novel pickup stylus includes a tapering dielectric support element which has a tip defined by a prow and a relatively flat surface remote from the prow. The dielectric support element has an arrowhead-shaped cross-section in the region of its tip with the apex of the arrowhead-shape cross-section located on the prow and its base defined by the rear surface. The entire rear surface of the dielectric support element is covered with conductive material to form a narrow electrode in the region of its tip. To form a narrowed-electrode stylus, a tapering dielectric support element, having a prow and an electrode surface remote from the prow, is introduced in a trapezoidal abrasive groove while relative motion is established therebetween. The electrode face of the support element is gradually tilted toward the abrasive groove until it subtends a shallow angle therewith to form a portion having an arrowhead-shape cross-section in the region of its tip. The support element is lapped later to form a bottom surface defining a stylus shoe.

REFERENCES:
patent: 1197141 (1916-09-01), Mergenthaler
patent: 1817094 (1931-08-01), Moore
patent: 2350732 (1975-04-01), Dickopp
patent: 3826877 (1974-07-01), Leedom
patent: 3842194 (1974-10-01), Clemens
patent: 3877705 (1975-04-01), Joschko
patent: 4031546 (1977-06-01), Leedom

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