JP2734592B2 - Recording and playback device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus for optically recording / reproducing information using a recording disk.

2. Description of the Related Art FIG. 4 shows a schematic configuration diagram of a conventional recording / reproducing apparatus.
3 ″ is a yoke A, in which a permanent magnet 12 is incorporated.
Is a yoke B and constitutes a closed circuit of a magnetic field with the yoke A3 ″. Two sets are provided. Four heads 6 are provided with two shafts and incorporate an optical system for writing, reproducing and erasing information. It engages with a bearing 7 attached to the head 6 as a guide for transporting in the Y-axis direction.The coil 8 is wound so as not to contact the yoke B5, and the coil 8 is attached to the bearing 7 attached to the head 6. The head 6 is moved in the Y-axis direction by a force in the Y-axis direction generated by the influence of the magnetic field generated by the yoke A3 ″ and the yoke B5 by passing a current through the coil 8. Reference numeral 9 denotes a disk motor which rotates by engaging with a recording disk (not shown).

11 is a mechanical chassis, yoke A3 ″, shaft 4, yoke
B5, the base on which the disk motor 9 is mounted. Reference numeral 10 denotes a mounting portion for mounting the yoke A3 "to the mechanical chassis 11 with screws. The head 6 is constituted by a transfer table 6a as an outer housing and an internal optical system (not shown).

However, in the above-described configuration, the mechanical chassis, which is a base on which the yoke, shaft, disk motor, and the like are mounted, is made of aluminum die-cast, etc., and is large in order to obtain strength. In order to change the moving range of the optical disc, a mechanical chassis having a completely new shape is required, and for example, there is a problem in that it is costly to change to a model corresponding to a recording disk having a different diameter.

In view of the foregoing, it is an object of the present invention to provide a recording / reproducing apparatus which can be made small and which can relatively easily change a moving range of a head.

Means for Solving the Problems In the recording and reproducing apparatus of the present invention, a motor for rotating a recording disk and an optical system for performing recording or reproduction,
A transfer table supporting at least a part of the optical system, guide means for guiding the transfer table so as to be movable in a radial direction of the recording disk, and a linear motor for driving the transfer table;
A coupling member located apart from the linear motor; the linear motor is constituted by a coil substantially fixed to the transfer table, a yoke made of a magnetic material, and a permanent magnet, and the linear motor and the yoke are further coupled. The frame is formed by connecting the yoke and the connecting member, and the guide means is supported on the frame.

With the above configuration, the recording / reproducing apparatus of the present invention
In particular, it is possible to guide the transfer table carrying at least a part of the optical system to the position facing the recording disk engaged with the motor by the guide means, without requiring a separate chassis or the like.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

One embodiment of the present invention is shown in FIG. 1 and FIGS.

In FIG. 1, 4 is a shaft, 5 is a yoke B, 6 is a head, 7 is a bearing, 8 is a coil, 9 is a disk motor,
Numeral 10 denotes a mounting portion, and 12 denotes a permanent magnet, all of which are exactly the same as those of the above-described conventional example and have the same functions.

Reference numeral 1 denotes a motor base on which a disk motor 9, a shaft 4, and a yoke B5 can be mounted.
(4 places) are fixed using screws. Reference numeral 2 denotes a rear base, which is a connecting member for connecting the yoke A3,
One end of B5 can be attached, and yoke A3 is the attachment part
Secured using screws at 10 (4 locations). 3 is York A
Therefore, the number of the mounting portions 10 is increased by two from the yoke A3 'to four, and the mounting accuracy between the motor base 1 and the rear base 2 can be improved. Further, by locating the joint surface 3a with the disk motor stand 1 and the joint surface 3b with the rear stand 2 on the same plane, the number of processing steps is reduced and the processing accuracy is improved.

FIG. 2 is a plan view of the present apparatus. For example, in the case of a model using disks of different diameters, it is necessary to change the moving range of the head 6, but if the configuration as in this example is adopted,
As shown in FIG. 3, yoke A3 ', shaft 4', yoke B5 '
Need only be changed for each of
And the rear stand 2 does not need to be changed and is excellent in adaptability.

In comparison with the conventional example shown in FIG.
Since no components such as a chassis such as aluminum die-casting are required on the outside of the device, the device can be configured to be small and lightweight.

As described above, according to the present embodiment, the moving range of the head can be easily changed by using the motor base, the rear base, and the yoke connecting these parts without using the mechanical chassis, so that the moving range of the head can be easily changed. Since it is not necessary, the size and weight can be reduced.

In the present embodiment, the yoke B5 and the shaft 4 are fixed to the motor base 1 and the rear base 2, but may be fixed to the yoke A3.

Further, if the rear stage 2 is provided with a light source and a photodetector and a transfer stage on which an objective lens or the like is mounted in place of the head 6, it can be easily applied to an optical head of a so-called separation optical system.

Advantageous Effects of the Invention As described above, according to the present invention, the moving range of the head can be easily changed without the necessity of a large mold change, and the size and weight can be reduced, and the practical effect is large.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a transfer device used in a recording / reproducing apparatus according to one embodiment of the present invention, FIG.
FIG. 4 is a plan view of a head moving range change example, and FIG. 4 is a schematic configuration perspective view of a transfer device used in a conventional recording / reproducing device. 1 ... Motor stand, 2 ... Rear stand, 3 ... Yoke A, 4 ...
Shaft, 5 ... Yoke B, 6 ... Head, 7 ... Bearing (guide means), 8 ... Coil, 9 ... Disk motor, 10 ... Mounting part, 11 ... Mechanical chassis, 6a ... Transfer stand .

Claims (1)

(57) [Claims] 1. A recording / reproducing apparatus for writing information to or reproducing information from a recording disk, comprising: a disk motor that engages with the recording disk to rotate the disk; and a motor base to which the motor can be attached. An optical system for performing recording or reproduction, a transfer table carrying at least a part of the optical system, guide means for guiding the transfer table so as to be movable in a radial direction of the recording disk, and the transfer table A linear motor to be driven, and a coupling member located apart from the motor base; the linear motor includes a yoke and a permanent magnet made of a coil and a magnetic material substantially fixed to the transfer base; A yoke is joined and the yoke and the joining member are joined to form a frame,
A recording / reproducing apparatus characterized in that the guide means is supported on the frame.