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 Title: |
US3873762:
Spring loaded stylus arm pivot
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Taylor, Byron Kent; Indianapolis, IN
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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: |
1975-03-25
/ 1973-10-01
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| Application Number: |
US1973000402411
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| IPC Code: |
Advanced:
G11B 21/20;
H04N 5/76;
Core:
more...
IPC-7:
G11B 3/10;
H04N 5/82;
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| U.S. Class: |
Current:
369/244.1;
369/043;
369/126;
369/253;
Original:
178/006.6A;
274/023.R;
274/023.A;
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| Field of Search: |
178/6.6 A
179/100.4 R
274/23 A,37,23 R
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| Priority Number: |
| 1973-03-26 |
GB1973000014393 |
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| Abstract: |
For a video disc system wherein information is recorded in a smooth spiral groove on the surface of a disc and wherein the recorded information is recovered by a stylus riding in the groove when relative motion is established between the stylus and the disc, a spring loaded stylus arm pivot coupling is provided. The spring loaded stylus arm pivot coupling comprises a plug having a circular cross-section and a support member having an opening with dimensions permitting only a partial entry of and presenting annular surfaces for smooth engagement with the plug. The dimension of the opening in the direction tangential to the groove at the point of engagement of the stylus with the groove, is spring loaded to permit the plug to rock freely toward and away from the disc to accommodate disc surface undulations while at the same time the annular surfaces of the opening remain in continuous engagement with the peripheral surfaces of the plug. The plug is attached to the stylus arm and the support member is attached to the stylus arm carrying structure. The stylus is attached to a flattened free end of the conductive stylus arm, the flattened end augmenting the vertical compliance of the stylus arm assembly, while providing a conductive connection between the conductive surface of the stylus and the remaining length of the stylus arm.
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| Attorney, Agent or Firm: |
Whitacre, Eugene M. ;
Meagher, William H. ;
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| Primary / Asst. Examiners: |
Konick, Bernard; Moore, David K.
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| INPADOC Legal Status: |
None
Family Legal Status Report
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| Family: |
Show 16 known family members
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First Claim:
Show all 8 claims |
What is claimed is:
1. In a video disc playback system including a board, a turntable mounted for rotation relative to said board and having a surface adapted to receive a disc having a spiral groove with information recorded therein, a stylus subject to positioning in said spiral groove for recovering said information, a stylus arm carrying said stylus, and a stylus arm carrying structure subject to motion relative to said board during disc playback in a direction substantially parallel to said turntable surface and oriented to permit movement of said stylus arm in a direction effectively tangential to said spiral groove at the point of engagement of said stylus with said groove to reduce errors in the relative stylus/groove velocity; a spring loaded stylus arm pivot coupling comprising:
- a plug having one end attached to said stylus arm and having a substantially circular cross-section in a region remote from said one end;
- a support member attached to said stylus arm carrying structure in such manner as to participate in said motion thereof, said support member having an opening with dimensions permitting only a partial entry of said plug and presenting annular surfaces for smooth engagement with a surface of said plug in said remote region; the dimensions of the engaging surfaces of said opening and said remote plug region differing sufficiently to permit a rocking movement of said plug in said opening, when received therein, in a direction providing rotation of said stylus arm about an axis parallel to said turntable surface and substantially perpendicular to the direction of motion of said support member; and
- means for spring loading said plug in said opening in said direction tangential to said groove at the point of engagement of said stylus with said groove so as to effect transmission of said motion of said support member to said stylus arm without significant lag while permitting said rocking movement of said plug to accommodate disc surface undulations during playback;
- said spring loading means comprising a spring having a first end supported by said stylus arm carrying structure, and a second end presenting an arcuate surface for engagement with a surface of said plug.
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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 7 U.S. patent(s) that reference this one
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