JPH02193320A - Optical recording and reproducing device - Google Patents

Abstract

PURPOSE:To simplify a frame body without deteriorating the mechanical strength and to miniaturize the subject device by making a yoke of a linear motor for driving a moving base mounted with an optical head serve concurrently as the frame body. CONSTITUTION:Two side parts 21 and 22 disposed parallel are spanned between both ends respectively with main yokes 23 and 24 constituting a linear motor part with a thickness of a few millimeters formed of a ferrous metal as a magnetic substance, and they are positioned by positioning pins 25 to be fixed with stepped screws 26, whereas the rectangular frame body is composed of the side parts 21 and 22 and the main yokes 23 and 24. Then, the moving base 6 mounted with the optical head 5 is moved along a guide shaft 3 when a driving coil 9 is electrified, acting with a magnetic field formed by permanent magnets 10 and 11, and information is recorded and reproduced on a disk D. Thus, by making the yokes 23 and 24 and the side parts 21 and 22 serve as the frame body, the device can be miniaturized without deteriorating the strength of the frame body.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an optical recording and reproducing apparatus that records and reproduces information by irradiating light onto a disc-shaped information recording medium.

[Background Art] In recent years, the capacity of recording and reproducing devices has increased, and optical disk memories have attracted attention as high-density recording media. In order to record or reproduce information using an optical disc, it is necessary to move a movable table on which an optical head is mounted in the radial direction of the optical disc. This drive method includes a method in which a DC motor is used as a drive source and is reduced in gear and moved using a rack, and a method in which a lead screw is rotated using a DC motor as a drive source and a lead pin is engaged with this lead screw and moved. . However, in order to process large amounts of data at high speed, voice coil type linear motors that can be accessed at high speed are often used.

3 and 4 show conventional examples of such an optical recording/reproducing device. In FIG. 3, a rectangular frame l consists of four sides 1a to 1d and a bottom surface 1e. A spindle motor 2 for rotationally driving the disk D is attached to the center of the disk. Moreover, on the opposing side 1a and the IC,
Two guide shafts 3 are arranged in parallel with the spindle motor 2 in between, and both ends of these guide shafts 3 are connected to fixing members 4, respectively.
Fixed by Between the guide shafts 3 is an optical heald 5-
A movable table 6 on which is placed is supported via bearings 7.7 and is slidable along the guide shaft 3. In addition, a linear motor section for driving the moving table 6 is installed parallel to the guide shaft 3 and on both sides thereof, and both ends of the main yoke 8 are connected to the side section 1a.
, fixed to the IC. As shown in FIG. 4, the main yoke 8 is inserted through a drive coil 9 fixed to the moving table 6.
Opposed yokes 12.13 to which permanent magnets 10.11 are attached are provided above and below the drive coil 9, and both ends of the opposed yokes 12.13 are connected and fixed to the main yoke 8 by auxiliary yokes 14.

In the above configuration, when the drive coil 9 is energized, the guide shaft 3 is moved by the action of the magnetic field formed by the permanent magnets 10 and 11.
A driving force is generated in the direction, and the optical head 5 moves together with the movable table 6 to record and reproduce information on the disk D.

Problem to be solved by invention C 1 However, the frame l is usually a large die-cast part, making it difficult to mold and process it, and it is also difficult to miniaturize the device, especially for 3.5-inch optical discs. Half-hide size (height approx. 41mm, width 101mm)
There is a problem with the realization of a device called ``space disadvantage''.

[Object of the Invention] An object of the present invention is to provide an optical recording/reproducing device whose frame can be simplified and the device can be downsized without reducing mechanical strength.

[Summary of the Invention] The gist of the present invention for achieving the above-mentioned object is to provide a movable table on which an optical head is placed, a guide shaft that fits into a bearing of the movable table and guides the movable table, An optical recording/reproducing device comprising two linear motors disposed on both sides of a movable base and driving the movable base, and a frame body that supports and fixes both ends of the guide shaft and the linear motor, respectively, wherein the frame body An optical recording/reproducing device characterized in that the main yokes of the linear motor are fixed between two opposing sides and two main yokes of the linear motor fixed between these sides.

[Embodiments of the Invention] The present invention will be explained in detail based on the embodiments shown in FIGS. 1 and 2.

In FIG. 1, two parallel sides 21.2
A main yoke 23, 24, which constitutes a linear motor section with a thickness of several mm and made of a magnetic iron-based metal, is passed between each end of the main yokes 23 and 24, and is positioned by a positioning pin 25. In addition, it is fixed by a stepped screw 26, and a rectangular frame is constituted by the side portions 21.22 and the main yoke 23.24. The configurations of the moving table 6 and the linear motor section are the same as in the conventional example, and the same reference numerals as in FIGS. 3 and 4 indicate the same members.

In this embodiment, as shown in FIG.
．． 24 also serves as a frame body, there is no need to provide the side sides 1b, 1d and bottom surface 1e in the conventional example shown in FIG. 4, and the mechanical strength of the main yokes 23 and 24 itself is high. Therefore, by positioning and fixing the main yokes 23.24 to the side portions 21.22, sufficient rigidity of the frame body can be ensured.

Furthermore, since the frame body, which is conventionally a large die-cast part, can be divided into smaller parts of half or less, mold production and processing become easier, and mounting accuracy is also improved.

[Effects of the Invention] As explained above, the optical recording/reproducing device according to the present invention allows the yoke of the linear motor to also serve as the frame, thereby reducing the size of the device without reducing the strength of the frame. It becomes possible to do so.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of the optical recording/reproducing device according to the present invention, where Figure 1 is a perspective view, Figure 2 is a sectional view, and Figure 3 is a perspective view of a conventional example. FIG. 4 is a sectional view. 3 is a guide shaft, 5 is an optical head, 6 is a moving stage, 9 is a drive coil, 10.11 is a permanent magnet, l 2, 3 is an opposing yoke, 4 is an auxiliary yoke, 2 is a side part, 3. 24 is the main yoke.

Claims (1)

[Claims] 1. A moving table on which the optical head is placed, a guide shaft that fits into a bearing of the moving table and guides the moving table, and two linear units arranged on both sides of the moving table and driving the moving table. In an optical recording/reproducing device comprising a motor and a frame for supporting and fixing both ends of the guide shaft and the linear motor, the frame is fixed between two opposing sides and between these sides. An optical recording/reproducing device comprising two main yokes of the linear motor.