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US 4,509,159 AGranted
Aluminum-aluminum oxide stylus arm
AssigneePickering & Company, Inc.
InventorsGeorge Alexandrovich, J. Raymond Edinger, Alan Hofer, John Kuykendall
Life of this patent
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Abstract
An improved stylus assembly for a phonograph cartridge is provided. The assembly includes an arm having a jeweled stylus attached to one end thereof. The arm is formed of a hollow aluminum tube which has been anodized so as to form an aluminum oxide skin about the outer surface thereof. The skin extends for no more than one-half the thickness of the arm.
Claims4
A phonographic stylus assembly comprising:
- a hollow arm formed of a non-magnetic metallic material;
- a jeweled stylus affixed to one end of said arm and a magnetic element mounted to said arm opposite said jeweled stylus;
- said arm having an anodized skin extending inwardly for substantially one-half the thickness of said arm from the outer surface toward the interior surface thereof, said skin comprising an oxide of said metallic material;
- a non-magnetic, electrically conducting tube surrounding said arm;
- and an electrically conducting tie wire electrically connecting the interior surface of said arm with said tube.
2 more elements
The method of forming a phonograph cartridge stylus assembly comprising the steps of:
- forming a stylus arm of a hollow non-magnetic metallic material;
- securing a jeweled stylus to one end of said arm;
- anodizing said arm in an anodizing bath so as to form a skin of an oxide of said metallic arm about the outer surface of said arm;
- and,
- mounting said arm within a non-magnetic electrically conductive tube and securing an electrically conductive tie wire between the interior of said arm and said conductive tube.
2 more elements
Dependencies are inferred from the claim text.