 |
|
|
|
|
|
 Title: |
US3871663:
Record contact spindle
[ Derwent Title ]
|
| Country: |
US United States of America
|
| |
| Inventor: |
Stave, Frederick Roland; Oaklandon, IN
|
| Assignee: |
RCA Corporation, New York, NY
other patents from RCA CORPORATION (466175) (approx. 7,929)
News, Profiles, Stocks and More about this company
|
| Published / Filed: |
1975-03-18
/ 1973-03-12
|
| Application Number: |
US1973000340545
|
| IPC Code: |
Advanced:
G11B 3/58;
G11B 3/60;
G11B 9/06;
G11B 17/028;
H04N 5/781;
H04N 5/82;
H05F 3/02;
Core:
G11B 3/00;
G11B 9/00;
H04N 5/80;
more...
IPC-7:
G11B 9/06;
H05F 3/02;
|
| ECLA Code: |
G11B17/028D; G11B9/06;
|
| U.S. Class: |
Current:
369/270.1;
G9B/009.014;
G9B/017.006;
Original:
274/010.S;
317/002.R;
|
| Field of Search: |
274/10 S,39 R,39 A
317/2 R
|
| Priority Number: |
|
| Abstract: |
One type of video disc record reproducing system senses the capacitance between a stylus and the disc record to reconstruct the video information. The stylus includes a thin conductive element electrode and rides on the record, which is rotated at high speeds. The record, which includes a conductive layer covered with a thin dielectric material, is susceptible to accumulating an electric charge. Disposing a pickup device such as a stylus in proximate or contacting relation with such a charged record disc can produce a destructive discharge of the record through the pickup device which results in damage to the stylus. To minimize the occurence of such damage, the disc record is contacted by means which provide a conductive path through the record spindle to a point of reference potential for the system. In one arrangement, the spindle has a slide bar spring biased to be within the periphery of the spindle when the spindle is stationary. Upon rotation of the spindle, the bar extends out of the spindle to contact the record surface. In a further arrangement, a grounding flipper is pivotally mounted in the spindle. The flipper passes through the record hole and is spring biased to bear against the record surface.
|
| Attorney, Agent or Firm: |
Whitacre, E. M. ;
Hayes, J. B. ;
Meagher, William H. ;
|
| Primary / Asst. Examiners: |
Aegerter, Richard E.; Stephan, Steven L.
|
| INPADOC Legal Status: |
None
Family Legal Status Report
|
| Family: |
Show 28 known family members
|
First Claim:
Show all 12 claims |
I claim:
1. A playback system for disc records of the type having a centrally apertured major surface comprising exposed conductive material in the vicinity of the aperture and susceptible to accumulating an electric charge of sufficient magnitude to damage a pickup device for transducing said record comprising: a rotatable turntable and a record centering spindle mounted for rotation with said rotatable turntable, a conductive member mounted in said spindle for movement between (1) a first position sufficiently withdrawn within said spindle to permit record passage to a playback position centered about said spindle and supported by said turntable, and (2) a second position extending sufficiently from said spindle to permit electrical contact between said member and the exposed conductive material of a major surface of a record when said record is disposed in said playback position with said turntable in supporting contact with a surface of said record opposite to said major surface, and means coupling said conductive member through said spindle to a point of reference potential for said playback system.
|
| Background / Summary: |
Show background / summary
|
| Drawing Descriptions: |
Show drawing descriptions
|
| Description: |
Show description
|
| Forward References: |
Show 20 U.S. patent(s) that reference this one
|
