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 Title: |
US3835262:
VIDEO DISC CUTTING USING PRESSURIZED AIR TO CONTROL DEPTH OF GROOVES
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Moritz, Scott N.; Villa Park, IL
Polley, Eugene; Lombard, IL
Puls, Werner H.; Northbrook, IL
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| Assignee: |
Zenith Radio Corporation, Chicago, IL
other patents from ZENITH ELECTRONICS CORPORATION (639685) (approx. 1,798)
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| Published / Filed: |
1974-09-10
/ 1973-06-04
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| Application Number: |
US1973000366812
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| IPC Code: |
Advanced:
G11B 3/72;
Core:
G11B 3/00;
IPC-7:
G11B 3/72;
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| U.S. Class: |
Current:
369/153;
369/170;
369/251;
G9B/003.107;
Original:
179/100.4C;
178/006.6B;
11B/025.04;
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| Field of Search: |
179/100.4 C,100.4 ST,100.4 R,100.2 P
340/174.1 E
178/6.6 B
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| Priority Number: |
| 1973-06-04 |
US1973000366812 |
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| Abstract: |
A method and apparatus for controlling the depth to which grooves are cut in a master video recording disc. Pressurized air is directed toward the surface of the disc in order to lift and maintain a cutting stylus assembly at a predetermined height above the surface of the disc, thereby assuring that the grooves will be cut to a predetermined reference depth.
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| Attorney, Agent or Firm: |
Moore, John H. ;
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| Primary / Asst. Examiners: |
Eddleman, Alfred H.;
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| Family: |
None
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First Claim:
Show all 4 claims |
I claim:
1. A method of cutting a video recording disc master comprising:
rotating the disc at a predetermined speed with the stylus in cutting position on the disc;
vibrating the stylus in response to a video information bearing signal for imparting to a groove a varying contour which corresponds to the information to be recorded;
directing a laminar flow of gas under pressure downwardly onto an uncut portion of the disc substantially adjacent to the stylus; and
controlling the pressure of the gas to control the spatial relationship between the stylus cutting tip and the surface of the disc in order to control the reference depth to which the grooves are cut.
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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 11 U.S. patent(s) that reference this one
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