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US 3,943,276 AGranted
Record tracking pickup structure for a capacitive disc
AssigneeZenith Radio Corporation
InventorRoger W. Knitter
Life of this patent
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Abstract
A pickup structure for tracking records includes a stylus formed of a section from a diamond crystal. That section has the cross sectional configuration of a square and, when employed as a capacitive pick up, has a conductive coating on one face. Any of the four corners may be employed as a tracking stylus.
Claims2
A pickup structure for tracking a record disc having a metallized information-storage groove to derive information stored therein comprising:
- a sensing element of a substantially homogeneous material that is hard compared with the material of the disc and having a cross sectional configuration such that the element presents at least two substantially identical angular-shaped and spaced apart corner portions individually dimensioned to enter into the grooves of said disc and serve as a tracking stylus, one surface of each of said angular shaped portions having a coating of conductive material which may constitute in conjunction with said metallized groove of said disc a variable capacitor presenting a capacitance determined by the information stored in said groove;
- and
- means for supporting said sensing element with any of said corner portions in tracking relation with said groove, said means being adjustable to change the orientation of said sensing element to bring a different one of said corner portions into tracking relation with said groove.
Dependencies are inferred from the claim text.