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 Title: |
US3842217:
RECORD FABRICATION OF A CAPACITIVE TYPE STORAGE MEDIUM
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Clemens, John Kaufmann; 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: |
1974-10-15
/ 1972-12-26
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| Application Number: |
US1972000318334
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| IPC Code: |
Advanced:
G11B 9/00;
H04N 5/76;
Core:
more...
IPC-7:
G11B 11/12;
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| U.S. Class: |
Current:
369/101;
369/017;
369/126;
386/E05.068;
Original:
179/100.4C;
179/100.3A;
179/006.6A;
179/100.1B;
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| Field of Search: |
179/100.3 A,100.3 V,100.4 R,100.4 C,100.1 B
178/6.6 DD,6.6 B,6.6 A,6.7 A
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| Priority Number: |
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| Abstract: |
An information record employs a storage medium comprising a metallized base material having a dielectric coating thereon. The dimensions of an information track contained in a groove in the storage medium vary in accordance with recorded information. The capacitance between an electrode in a pickup tracking in said groove and the metallized surface of the storage medium varies in accordance with the modulated information track as the pickup device scans the recording medium. Circuitry responding to said capacitance variations provides an output signal corresponding to the information recorded. One application of such a system is to record, on both sides of a disc, video information which can be reproduced in form of a video display. Recording apparatus utilizes a scanning electron microscope to bombard successive resist-coated groove bottom regions of a recording master disc with an electron beam, controlled in intensity in accordance with signals being recorded. A stamping disc, derived from the developed recording master disc, is used to impress a replica disc of thermoplastic material (e.g., vinyl). Replica disc is coated with a conductive material (e.g., aluminum), and a layer of dielectric material is deposited over the conductive coating.
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| Attorney, Agent or Firm: |
Whitacre, E. M. ;
Meagher, William H. ;
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| Primary / Asst. Examiners: |
Konick, Bernard; Taber, Alan
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| INPADOC Legal Status: |
None
Family Legal Status Report
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| Parent Case: |
This application is a division of my co-pending application, Ser. No. 126,772, filed Mar. 22, 1971, and the invention herein relates to recording methods and apparatus and related record-replicating methods permitting, for example, relatively inexpensive mass replication and simple playback of records of video signals for display in monochrome or color.
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| Family: |
Show 59 known family members
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First Claim:
Show all 8 claims |
What is claimed is:
1. A recording method comprising the steps of:
- 1. coating a spiral groove in the surface of a disc with a material of a character exhibiting a difference in its resistance to dissolution in a developing fluid of a given type after subjection to electron beam bombardment;
- 2a. intruding successive regions of the coated groove bottom along said spiral on said disc surface in the path of a beam of electrons, while simultaneously
- 2b. alternating the intensity of said beam of electrons, between a first intensity level substantially equal to zero and a second intensity level appreciably greater than zero, under the control of signals to be recorded; and
- 3. subjecting said disc surface, after said intrusion of said coated groove bottom regions in said path, to a flow of developing fluid of said given type whereby to provide a disc having successive groove bottom regions of differing depths representative of said signals.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 25 U.S. patent(s) that reference this one
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