Dynamic information storage or retrieval – Dynamic mechanism subsystem – Having power driven transducer assembly
Patent
1995-06-26
1998-07-07
Levy, Stuart S.
Dynamic information storage or retrieval
Dynamic mechanism subsystem
Having power driven transducer assembly
369244, G11B 2102
Patent
active
057779783
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a disk unit which is optimally used for a compact disk player, a CD-ROM drive or the like, and to a process for assembling a transmission mechanism used for driving a head carriage.
BACKGROUND ART
An optical disk unit is traditionally equipped with an optical pick-up device that is movable frontwards and backwards by means of a drive motor and a disk table which is rotatably driven by means of a spindle motor. An optical disk is placed on the disk table for rotation together therewith. As is generally known, the optical disk unit operates to read and reproduce a predetermined information signal recorded in a recording track through a record-tracking operation according to which the predetermined information signal is recorded by vertically emitting a laser beam generated from the optical pick-up device to the optical disk from its bottom, while transferring the optical pick-up device in a radial direction of the optical disk.
In such optical disk units, since the high-density information signal recorded in the optical disk is read while transferring the optical pick-up device from the inner periphery of the optical disk to the outer periphery, there is a possibility that tracking error in the recording track will result from an error in the transfer of the optical pick-up device. As a result the information signal is not read and thus a good reproduction cannot be made owing to the lack in reproducing signals.
For the reasons indicated above, the driving-force transmission gear mechanism which is provided for transferring the optical disk unit, is conventionally equipped with a backlash eliminating mechanism, for eliminating backlash between a meshing pair of gears and for enhancing reliability in the transfer of the optical pick-up device.
One such conventional optical disk unit will be hereinbelow explained in accordance with FIG. 39.
In this drawing, reference numeral 1 denotes a mechanical deck which is formed with a through window la being substantially rectangular from the plan view and opening in a vertical direction of the deck and a cut-out 1b being substantially semi-circular in the plan view and integrally formed with the through window 1a. The mechanical deck is disposed in a body (not shown) of an optical disk player.
Reference numeral 2 denotes a spindle motor which has an output shaft penetrating the cut-out 1b and is fixed on the reverse side (under surface) of the mechanical deck 1.
Reference numeral 3 denotes a disk table, on which the disk is placed, is fixed on the top of the output shaft 2a and has a driven connection with the spindle motor 2 for co-rotation therewith.
Reference numerals 4 and 5 denote a pair of right and left guide shafts respectively extending in the advancing and retreating directions of an optical head carriage as set out below. The guide shafts are arranged in parallel with each other in the body (not shown) of the player and fixed at the perimeter of the window 1a on the reverse side of the deck.
Reference numeral 6 denotes the optical head carriage which is provided for transferring an optical pick-up device 7 in the front and rear directions and slidably mounted on the guide shafts 4 and 5 through bushings 8.
Reference numeral 9 denotes a rack mechanism which is provided for transmitting a driving force produced by a motor. The rack mechanism consists of a first rack 10 extending frontwards and rearwards and fixed on one side of the optical head carriage 6, a second rack 12 extending frontwards and rearwards and slidably mounted on the upper surface of the first rack 10 through a spacer 11, and a compression coil spring 13 operably disposed between the first and second racks 10 and 12 for spring-loading them and serving as a backlash eliminating mechanism by producing the spring bias so that the two racks are spaced apart from each other.
Reference numeral 14 denotes a motor which is fixed on the upper surface of the mechanical deck 1 at one side of the latter for driving the head carriage. A motor gea
REFERENCES:
patent: 4654737 (1987-03-01), Hopkins et al.
patent: 5119362 (1992-06-01), Yanagisawa
patent: 5307339 (1994-04-01), Tanaka
Hosoya Masakatsu
Ota Toshiro
Yamazaki Takashi
Levy Stuart S.
Ometz David L.
Sony Corporation
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