Method for forming keel-tipped stylus for video disc systems

Details Method for forming keel-tipped stylus for video disc systems Method for forming keel-tipped stylus for video disc systems

1977-03-25

1978-08-08

Smith, Gary L.

Abrasive tool making process, material, or composition

Impregnating or coating an abrasive tool

274 38, 360122, B24B 100

Patent

active

041048326

ABSTRACT:
A keel-tipped stylus comprises a tapering body, a fore-and-aft constricted terminal portion and shoulders joining the tapering body to the constricted terminal portion. To form a keel-tipped stylus, a tapering support element, made from hard material--such as diamond or sapphire-- is run on an abrasive lapping disc having a deep coarse-pitched groove. The lands on the lapping disc lap the shoulders of the keel-tipped stylus and the walls of the abrasive groove form the substantially parallel fore-and-aft surfaces of the constricted terminal portion. The abrasive groove can be deeper than the height of the keel tip; in that case, the bottom surface of the constricted terminal portion can be lapped later. Alternately, the bottom of the abrasive groove can be positioned such that it laps the bottom surface of the constricted terminal portion during the concluding portion of the keel-lapping procedure.

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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