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 Title: |
US3872241:
Video disc pickup with capacitive tracking
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Adler, Robert; Northfield, IL
Knitter, Roger W.; Hoffman Estates, 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: |
1975-03-18
/ 1973-07-12
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| Application Number: |
US1973000378467
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| IPC Code: |
Advanced:
G11B 3/48;
G11B 9/07;
G11B 21/10;
Core:
G11B 3/00;
G11B 9/00;
more...
IPC-7:
G11B 9/06;
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| U.S. Class: |
Current:
369/043;
360/077.02;
369/126;
G9B/003.079;
G9B/009.022;
G9B/009.023;
G9B/021.02;
Original:
178/006.6A;
179/100.1B;
360/077;
179/100.41G;
179/100.41B;
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| Field of Search: |
179/100.41 R,100.41 B,100.41 G,100.1 B
360/077,135
178/6.6 R,6.6 A
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| Priority Number: |
| 1973-07-12 |
US1973000378467 |
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| Abstract: |
The electrostatic pick-up system is used for deriving signals which represent video program information stored on a video disc and are suitable for application to a television receiver to reproduce the video program. The pick-up itself has an increased bearing or tracking surface, leading to longer life and may be constructed to track within a single record groove or, alternatively, may bridge across and couple to a series of such grooves for radial tracking while presenting a probe in proper sensing relation to the groove that is to be sensed in any particular revolution of the disc. A generally similar arrangement omits mechanical coupling of the pick-up to the disc and, in its place, uses an electrical system to maintain radial tracking. This last-mentionend embodiment permits both stop frame and slow motion or other variable speed presentation of the image information stored in the disc.
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| Attorney, Agent or Firm: |
Pederson, John J. ;
O'Connor, Cornelius J. ;
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| Primary / Asst. Examiners: |
Fears, Terrell W.; Moore, David K.
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| INPADOC Legal Status: |
None
Family Legal Status Report
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| Family: |
Show 2 known family members
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First Claim:
Show all 8 claims |
1. An electrostatic pickup for sensing undulations formed in a pattern of grooves on the surface of a record disc to constitute a spatial representation and storage of the time variations of a signal to be reproduced, which disc further includes a conductive coating, said pickup comprising:
- a body of insulating material having a bearing or tracking surface with a length much greater than the pitch of the record grooves;
- a probe of conductive material extending through said body transversely of and intermediate the ends of said bearing surface and projecting into the plane of said bearing surface to sense the groove being tracked, said probe having a dimension measured along the direction of the groove that is small relative to the spatial wavelength of the signal stored on said disc;
- a first family of capacitive conductive elements supported by said insulating body and extending in the direction of and adapted to overlie one section of said groove patterns; and
- a second family of capacitive conductive elements also supported by said body and extending in the direction of and adopted to overlie a different section of said groove pattern,
- each of said capacitive conductive families of conductive elements individually exhibiting, with respect to the disc conductive coating, a capacitance having a predetermined reference value when said probe overlies the middle of a record groove being sensed but, each said family of elements exhibiting a different capacitance of a value which varies in sense and in amount in proportion to the radial displacement of said probe
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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 9 U.S. patent(s) that reference this one
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