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 Title: |
US3783196:
HIGH-DENSITY CAPACITIVE INFORMATION RECORDS AND PLAYBACK APPARATUS THEREFOR
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| Country: |
US United States of America
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| Inventor: |
Stanley, Thomas Osborne; Princeton, NJ
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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: |
1974-01-01
/ 1971-03-22
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| Application Number: |
US1971000126678
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| IPC Code: |
Advanced:
G11B 3/10;
G11B 9/00;
G11B 9/06;
G11B 9/07;
H04N 5/76;
H04N 5/92;
Core:
G11B 3/00;
more...
IPC-7:
G11B 3/44;
G11B 9/06;
H04N 5/76;
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| U.S. Class: |
Current:
369/126;
369/129;
386/E05.009;
386/E05.068;
Original:
179/100.1B;
178/006.6A;
178/006.6TP;
179/100.4M;
274/038;
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| Field of Search: |
179/100.1 B,100.4 M,100.41 G,100.4 C
178/6.6 TP,6.6 DD,6.6 A
096/1.1
340/173 TP
235/61.11 H,61.12 R
274/038
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| Priority Number: |
| 1971-03-22 |
US1971000126678 |
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| Abstract: |
A high-density information record comprises a stamped thermoplastic (e.g., vinyl) disc having a constant-width spiral surface groove, the center-to-center spacing of successive closely spaced convolutions of the groove spiral being substantially constant and independent of the recorded information. The recorded information appears as an information track constituting variations in the geometry of the groove bottom along its length. Playback apparatus employs a stylus having a tip conformed to be received in the disc groove in engagement with smoothly curved side walls of groove. As a disc-supporting turntable rotates, the stylus rides in the groove passing over successive dimension-varying information track elements in the groove bottom, which serve to vary the capacitance presented between a conductive electrode incorporated in the stylus tip and a reference conductor (e.g., a conductive surface of the disc-supporting turntable). The capacitance variations occurring during playback are translated into electrical signal variations by appropriate circuitry. Per illustrative embodiment, inexpensively replicated video disc of appreciable playing time is subject to playback by above-described techniques.
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| Attorney, Agent or Firm: |
Whitacre, E. M. ;
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| Primary / Asst. Examiners: |
Cardillo, Jr., Raymond F.;
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| INPADOC Legal Status: |
None
Family Legal Status Report
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| Family: |
Show 37 known family members
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First Claim:
Show all 20 claims |
What is claimed is:
1. A high-density information record playback system comprising:
- a disc record having a constant-width spiral groove in a surface thereof, the center-to-center spacing of successive convolutions thereof being substantially constant and independent of recorded information;
- said groove containing an information track constituted by variations in the geometry of the bottom of the groove representative of recorded information, and having sidewalls of a configuration which is substantially constant throughout said successive convolutions and independent of the groove bottom geometry variations representative of recorded information;
- a stylus having a tip subject to reception in said disc groove during playback use;
- said stylus including a support of insulating material, and an electrode of conductive material secured to said insulating support, said electrode presenting a surface of the disc groove bottom when said tip is received in said disc groove, which surface has a greater dimension in a lateral direction extending between said groove sidewalls and a lesser dimension in a longitudinal direction along said groove and normal to said lateral direction;
- a turntable for supporting said disc in a playing position permitting said disc groove reception of said stylus tip;
- means for rotating said turntable to establish relative motion between said disc groove and said stylus tip;
- and means electrically connected to said stylus electrode for developing an electrical signal representative of groove bottom geometry variations passing beneath said stylus electrode surface when said relative motion occurs.
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| Background / Summary: |
Show background / summary
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 21 U.S. patent(s) that reference this one
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