Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1994-07-21
1996-03-19
Epps, Georgia Y.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 4415, 369 4416, G11B 700
Patent
active
055008453
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an actuator arrangement for the scanning and/or recording of items of information on recording media. An arrangement, which is provided for fine- or follow-up control or regulation and with which a scanning and/or recording head is positioned in its location with respect to the recording medium, will be referred to as the actuator arrangement. The actuator is a component, in the output section of a control or regulating path, which has a decisive influence on the energy or earth currents and which acts therein as a variable resistance. Actuators are used in, amongst others, optical and magneto-optic recording and reproducing devices such as for example, CD players, in which items of information are scanned from a rotating recording medium, the CD disc, by means of a light beam. An exact positioning of the scanning means is required since even small deviations in the position of the scanning and/or recording head relative to the recording medium lead to losses of information and functional errors. For the reproduction of signals stored on an information carrier, such as for example, pictures and sound in a video disc player, sound in a CD player or data items of a magneto-optic disc, in addition to an exact focusing of the light beam on the disc, a precise guidance along the data track is also required whereby the actuator has to be guided as parallel and as perpendicular to the plane of the disc as possible. The guidance should be smooth and the actuator should exhibit a low mass so that even tiny displacement forces are sufficient for the regulation and a high regulating speed is ensured. On the other hand, the position of the actuator perpendicular to the plane of the disc should be as stable as possible so that vibrations, caused by external influences for example, do not disadvantageously affect the scanning or recording process and the scanning and/or recording head.
A reading head for the reading of information recorded as a track or as tracks on a recording medium which is moved relative thereto, is already known c.f. DE 26 45 326 C2. In this reading head, which has an objective lens for projecting a light point onto the surface of the recording medium, a scanning device for scanning the relative position between the objective lens and the track and for generating a tracking error signal and a focusing error signal, an objective lens carrier which is movable in a first direction parallel to the axis of the objective lens and is attached to the reading head via a compliant support and which is controllable in this first direction by the focusing error signal by means of a focusing coil arrangement and which also has a track following device by means of which the light point is adjustable by the tracking error signal perpendicularly to the objective lens axis and perpendicularly to the track in a second direction, resilient elements are used as the support for the objective lens carrier, which elements are mounted in the form of a helix having the axis of the objective lens as the central axis or symmetrically with respect to the axis of the objective lens and to the second direction. The support for the objective lens carrier is thus also compliant in a second direction perpendicular to the axis of the objective lens and the track following device is constructed, in known manner, as an electromagnetic adjusting device whose movable part is attached to the objective lens carrier and whose fixed part is attached to the reading head. In addition to the track following device, there is provided a further electromagnetic adjusting device whose movable part is attached to the objective lens carrier and whose static part is fixed to the reading head and the resilient elements are so constructed that the support for the objective lens carrier is adjustable by a time base error signal in a third direction perpendicular to the axis of the objective lens and parallel to the track. The support for the objective lens carrier has an intermediate part which is a
REFERENCES:
patent: 4482986 (1984-11-01), Noda et al.
patent: 4718050 (1988-01-01), Kurz et al.
patent: 5072433 (1991-12-01), Tanaka
patent: 5206762 (1993-04-01), Kasahara et al.
patent: 5208703 (1993-05-01), Ikegame et al.
Patent Abstracts Of Japan, vol. 9, No. 90, 19 Apr. 1985, (Seiko Denshi Kogyo K.K.) and Japan Pat. 59-218640 (Listed above).
Fuldner Friedrich
Hoch Peter
Kuhn Hans-Robert
Laufer Engelbert
Storz Dieter
Chu Kim-Kwok
Deutsche Thomson-Brandt GmbH
Epps Georgia Y.
Herrmann Eric P.
Tripoli Joseph S.
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