 |
|
|
|
|
|
 Title: |
US3870835:
STYLUS CONTROL APPARATUS FOR A VIDEO DISC RECORD PLAYER
[ Derwent Title ]
|
| Country: |
US United States of America
|
| |
| Inventor: |
Stave, Fredrick 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: |
1975-03-11
/ 1973-04-16
|
| Application Number: |
US1973000351600
|
| IPC Code: |
Advanced:
G11B 3/02;
G11B 3/06;
G11B 3/085;
G11B 3/095;
G11B 3/36;
G11B 3/46;
G11B 9/00;
G11B 33/10;
Core:
G11B 3/00;
G11B 33/00;
more...
IPC-7:
G11B 3/00;
G11B 17/06;
|
| U.S. Class: |
Current:
369/126;
369/223;
G9B/003.01;
G9B/003.045;
G9B/003.072;
G9B/003.078;
G9B/033.025;
Original:
179/100.4R;
274/013.R;
|
| Field of Search: |
178/6.6 A,6.6 DD,6.6 FS
179/100.4 R
274/4 H,11 E,13 R,15 R
|
| Priority Number: |
| 1973-04-16 |
US1973000351600 |
|
| Abstract: |
A playback system has a rotatably driven turntable for controlling the operation of a playback stylus device with a video disc record disposed on the turntable. The video information, which is recorded in the form of geometric variations in a spiral groove of the record, is recovered by sensing the capacitance between the stylus playback device and the record surface. The stylus is supported in a housing which is movable in a manner to provide travel of the stylus radially over the record. A stylus control device provides movement of the stylus relative to the housing into and out of engagement with the record surface. Two drive arrangements are provided to be operable in alternative manner to drive the stylus housing over the record. A movable pointer is provided to indicate the position of the stylus along the record. Each of first and second drive means have motion coupling devices, which are controllably engageable in alternative manner to a driving shaft of the turntable. A movable drive change assembly is intercoupled with the respective drive arrangements and the stylus control apparatus, to selectively energize the drive and stylus control apparatuses.
The system includes a manual selector arm for positioning a portion of control mechanism, which is instrumental in establishing drive control of the stylus housing and positioning of the stylus. The selector positions one of a pair of electrical contacts in a given initial spaced relation. The second electrical contact is positioned by a portion of the drive means to cause the contacts to engage at a desired position of the stylus over the record. An electrical circuit completed thereby is operative through electro-mechanical means to control the drive and positioning of the stylus with respect to the record.
A manually actuatable lever arrangement is coupled to the drive and stylus control mechanism. This mechanism when actuated is operative to disengage drive of the stylus housing over the record and remove the stylus from the record, while maintaining the position of the stylus with respect to the center of the record.
|
| Attorney, Agent or Firm: |
Whitacre, Eugene M. ;
Hayes, J. B. ;
Meagher, William H. ;
|
| Primary / Asst. Examiners: |
Urynowicz, Jr., Stanley M.; Levy, Stewart
|
| INPADOC Legal Status: |
None
Family Legal Status Report
|
| Family: |
Show 16 known family members
|
First Claim:
Show all 12 claims |
What is claimed is:
1. In a disc record playback system including a rotatably driven turntable, apparatus for controlling cooperation of a playback stylus with a turntable-supported disc record comprising, in combination:
- a stylus support housing;
- an arm carrying said stylus at one end thereof;
- a stylus arm pivot for coupling an end of said arm, remote from said one end, to said stylus support housing; said pivot permitting both lateral and vertical motions of said stylus relative to said stylus support housing;
- said stylus support housing being subject to translatory motion to provide a translation of said stylus arm pivot permitting travel of said stylus substantially radially of said record;
- stylus control means for providing vertical movement of said stylus relative to said housing between a first depressed position permitting stylus engagement with a turntable-supported record and a second elevated position precluding stylus engagement with a turntable-supported record;
- first drive means coupled to said stylus support housing and selectively responsive to rotation of said turntable for moving said stylus support housing between a standby position and a playback position;
- said stylus being in vertical registry with a region of said turntable when said stylus support housing is in a playback position, and out of vertical registry with said turntable when said stylus support housing is in said standby position;
- second drive means, independent of stylus-record engagement, coupled to said stylus support housing and selectively responsive to rotation of said turntable for moving said stylus support housing during playback of said record; and
- selective drive control means intercoupled with said first and second drive means and said stylus control means for selectively energizing said first drive means with said stylus disposed in said elevated position and for selectively energizing said second drive means while concomitantly disposing said stylus in said depressed position.
|
| Background / Summary: |
Show background / summary
|
| Drawing Descriptions: |
Show drawing descriptions
|
| Description: |
Show description
|
| Forward References: |
Show 5 U.S. patent(s) that reference this one
|
