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 Title: |
US3826877:
INFORMATION PLAYBACK SYSTEM STYLUS
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Leedom, Marvin A.; Princeton, NJ 08540
Miller, Michael Evans; Indianapolis, IN 46208
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| Assignee: |
None
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| Published / Filed: |
1974-07-30
/ 1972-09-06
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| Application Number: |
US1972000286657
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| IPC Code: |
Advanced:
G11B 9/00;
G11B 9/07;
Core:
more...
IPC-7:
G11B 11/06;
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| U.S. Class: |
Current:
369/126;
204/192.22;
G9B/009.023;
Original:
179/100.1B;
179/100.41G;
274/038;
178/006.6A;
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| Field of Search: |
179/100.41 G,100.1 B,100.4 M,100.4 R
178/6.6 DD,6.6 A
274/038
340/173 TP
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| Priority Number: |
| 1972-09-06 |
US1972000286657 |
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| Abstract: |
A video disc playback system includes a pickup stylus which is adapted to track in a groove in a disc record. The record comprises a molded thermoplastic substrate supporting a conductive surface with a dielectric coating disposed over the conductive surface. When relative motion is established between the disc record and the pickup, the pickup stylus cooperates with the disc record to establish capacitance variations between the stylus and the record due to geometrical variations in the bottom of the groove. The stylus includes a support element having an irregular surface with a conductive element disposed on the irregular surface. The support element is shaped in a manner such that when it engages the record medium groove, an edge of the conductive element is adjacent the dielectric coating.
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| Attorney, Agent or Firm: |
Whitacre, E. M. ;
Meagher, William H. ;
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| Primary / Asst. Examiners: |
Konick, Bernard; Faber, Alan
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| INPADOC Legal Status: |
None
Family Legal Status Report
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| Family: |
Show 21 known family members
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First Claim:
Show all 6 claims |
What we claim is:
1. A pickup stylus adapted to track in a groove in a storage medium having a conductive surface and a dielectric coating over said conductive surface, and further adapted to cooperate with said storage medium to provide capacitive variations between said stylus and said storage medium conductive surface when relative motion is established between said stylus and said storage medium, said stylus comprising:
- an elongated support element of insulating material having a tip of narrowed girth at one extremity of its longitudinal axis, said tip having a first tapering surface with edges which lie in a plane substantially parallel to said longitudinal axis, said tapering surface having a plurality of corrugations which extend in directions substantially parallel to said longitudinal axis and which terminate at a curved end of said tip;
- a conductive coating overlying said corrugated surface, the thickness of said coating being small relative to the average depth of said corrugations such that said coating follows the undulations of said corrugations; and
- said coating terminating at said curved end of said support element tip to expose a coating edge surface having a curvature substantially matching the curvature of said curved end.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 13 U.S. patent(s) that reference this one
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