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US 4,439,855 AGranted
Capacitive playback stylus
AssigneeRCA Corporation
InventorAnil R. Dholakia
Life of this patent
Estimating the term…
Abstract
A playback stylus for a capacitive information disc comprising a shank, a dielectric material at one end of the shank, a first conical region of a first angle in an end portion of the dielectric material, a second conical region adjacent to the first conical region of a second angle less than the first angle, and an information recovering terminal region in the first conical region for recovering information recorded in an information track of a capacitive information disc.
Claims7
A capacitive information disc playback stylus comprising:
- a shank;
- a dielectric support element at one end of the shank;
- a first conical region of a first angle within the range of 40 to 60 degrees in a portion of the dielectric support element, said first conical region terminating at a constricted tip;
- a second conical region adjacent to the first conical region and to the shank of a second angle less than the first angle, said second angle being about 30 degrees;
- and
- an information recovery terminal region in the first conical region for recovering information recorded in an information track of a capacitive information disc wherein said region is a keel tip.
3 more elements
Dependencies are inferred from the claim text.