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 Title: |
US3872265:
Video disc transmission line and stylus RF return systems
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Hilliker, Stephen Earl; Morresville, IN
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| Assignee: |
RCA Corporation, New York, NY
other patents from RCA CORPORATION (466175) (approx. 7,929)
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| Published / Filed: |
1975-03-18
/ 1972-10-10
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| Application Number: |
US1972000295854
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| IPC Code: |
Advanced:
G11B 3/02;
G11B 3/46;
G11B 9/06;
Core:
G11B 3/00;
G11B 9/00;
IPC-7:
H04N 5/76;
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| U.S. Class: |
Current:
369/126;
369/129;
G9B/003.078;
Original:
179/100.4M;
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| Field of Search: |
179/100.4 M
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| Priority Number: |
| 1972-10-10 |
US1972000295854 |
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| Abstract: |
An information playback system, for recovering information recorded on a record medium, includes a pickup stylus having a conductive element establishing a capacitance with the record medium that varies with the recorded information, a conductive support housing, and a flexibly mounted conductive member supporting the pickup stylus and forming a transmission line with the surrounding support housing. The flexibly mounted conductive member has one end movably connected to the support housing and the second end mechanically coupled to the stylus to provide mechanical support therefor. An electrical connection is provided between the flexibly mounted conductive member and the conductive element of the stylus to establish a tuned circuit including the reactances of the transmission line and of the variable capacitance formed between the stylus and the record medium. A source of signal energy coupled to the tuned circuit energizes the tuned circuit such that signals modulated by the record information are developed in the tuned circuit. When the stylus is in playing position, capacitance between the support housing and the record medium is established with sufficient magnitude to provide a low impedance path for the modulated signals between the record medium and the support housing, completing the tuned circuit connections in a manner advantageous to pickup sensitivity.
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| Attorney, Agent or Firm: |
Whitacre, Eugene M. ;
Meagher, William H. ;
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| Primary / Asst. Examiners: |
Canney, Vincent P.; Faber, Alan
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| INPADOC Legal Status: |
None
Family Legal Status Report
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| Family: |
Show 31 known family members
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First Claim:
Show all 13 claims |
1. An information playback system for recovering information recorded on a record medium, said information playback system comprising:
- pickup means for establishing a reactance subject to variations in accordance with said recorded information;
- a conductive support housing;
- an elongated conductive member having first and second ends and being enclosed within said conductive support housing throughout at least a major portion of its length, said first end being pivotally mounted within said support housing so as to permit relative motion between said conductive member and said enclosing support housing, and said second end being mechanically and electrically coupled to said pickup means so that said conductive member mechanically supports said pickup means in a manner permitting motion of said pickup means relative to said housing, and so that a transmission line formed due to the electrical relationship between said conductive member and said enclosing support housing is electrically connected to said pickup means in a manner establishing a tuned circuit which includes the reactance exhibited by said transmission line and the
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| Background / Summary: |
Show background / summary
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| Drawing Descriptions: |
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| Description: |
Show description
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| Forward References: |
Show 7 U.S. patent(s) that reference this one
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