Dynamic information storage or retrieval – Dynamic mechanism subsystem – Having power driven transducer assembly
Patent
1993-10-06
1996-04-23
Levy, Stuart S.
Dynamic information storage or retrieval
Dynamic mechanism subsystem
Having power driven transducer assembly
369249, G11B 7085
Patent
active
055110622
ABSTRACT:
An apparatus having a frame (1) carrying a turntable (3) for supporting the information carrier, which turntable is rotatable about an axis of rotation (3A), a slide (9), which is movable between two end positions, with a scanning unit, guide spindles (5, 7) and a linear motor unit (17, 19) for the slide, and an electrically energizable clamping unit (21). In the non-energized condition the clamping unit clamps the slide in any arbitrary stationary position of the slide along its path and in the energized condition it does not clamp the slide. During operation of the device a control unit at least substantially simultaneously turns on a first energizing current to the motor drive unit and a second energizing current to the clamping unit at the beginning of a displacement of the slide and at least substantially simultaneously turns off the first energizing current and the second energizing current at the end of the displacement.
REFERENCES:
patent: 2520290 (1950-08-01), Van Camp
patent: 4974222 (1990-11-01), Ishitoya et al.
patent: 4999530 (1991-03-01), Azuma et al.
patent: 5023862 (1991-06-01), Kim
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European Search Report Jul. 23, 1992.
Beijersbergen Van Henegouwen Cornelis M.
Blankers Petrus J.
Hensing Johannes M. M.
Hezemans Cornelius A.
Metzemaekers Leo G. M.
Ditmyer Paul J.
Levy Stuart S.
Miller Paul R.
Treacy David R.
U.S. Philips Corporation
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