JP2000182303A - Information recording/reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device to be reduced in size and cost by integrating a substrate. SOLUTION: A substrate 20 is a roughly rectangular parallelepiped boxlike casing having its lower surface set as an opening portion 20a, and inside it is provided with a first mechanism section for driving the reciprocating of an optical head 21, and a second mechanism section for driving the reciprocating a mounting base 22 for loading a card C. Since the number of substrates 20, i.e., 2, is reduced to 1, the management of position accuracy is facilitated, and part costs are reduced and thus the device is miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing apparatus for recording information on a recording medium or reproducing information from the recording medium.

[0002]

2. Description of the Related Art Conventionally, there are a magnetic system and an optical system in an information recording / reproducing apparatus. In recent years, an optical system for recording / reproducing information using a light beam has attracted attention. Examples of the optical information recording / reproducing apparatus include a CD or laser disk rotating a disk-shaped recording medium, an optical card reciprocating a card-shaped recording medium, and an apparatus using an optical tape. Although these devices are properly used depending on the purpose, optical cards are particularly attracting attention because of their excellent storability and portability.

Tracks are formed on the optical card at intervals of several μm, and information is recorded / reproduced by forming spots of several μm with a light beam between the tracks. An information recording / reproducing apparatus for recording / reproducing by driving a mounting table on which the optical card is mounted and an optical head in directions orthogonal to each other, and irradiating the optical card with a light beam while following the track in parallel with the track. Has been proposed.

FIGS. 3 and 4 are perspective views of internal units of a conventional information recording / reproducing apparatus. The optical head 1 includes an objective lens, a tracking / focusing mechanism, a reflection mirror,
And an optical system including a light receiving sensor, a laser light source, and the like for obtaining control and information signals. Then, recording is performed by forming an information recording pit by condensing the laser beam on the recording medium surface, and reproduction is performed by identifying a change in reflectance in the information recording pit.

FIG. 3 shows a first unit, in which an optical head 1 is supported by two shafts 3 attached in parallel to a first support base 2 so as to be movable in the short direction of the optical card. It is designed to move to the truck. The shaft 3 is supported by a plurality of bearings (not shown) attached to the optical head 1, and is configured to reciprocate via a gear 4 by a lead screw 6 linked to a motor 5. The optical system and the reciprocating mechanism are fixed to the same support base 2 to form a first unit.

FIG. 4 shows a second unit, in which the optical card is held on the mounting table 7 in a plane with both long sides sandwiched.
The mounting table 7 holding the optical card is guided by two guide shafts 8 supported by a bearing pair or a slide bearing (not shown), and reciprocates linearly by a voice coil motor 9. That is, information is recorded and reproduced by reciprocating drive in a direction parallel to the card track, which is the longitudinal direction of the card. The mounting table 7 and the reciprocating mechanism are supported by a support base 10.
To form a second unit.

FIGS. 5 and 6 show perspective views of the supporting bases 2 and 10, respectively, in which the first unit is mounted on and connected to the second unit. An opening window 11 for transmitting laser light is formed below the first support base 2. Inside one of the side walls provided at both ends in the Y direction of the second support base 10, the X and Y directions of the first support base 2 are provided.
Reference pins 12a and 12b for positioning in the direction are provided. Also, abutting portions 13a to 13d for determining the vertical position of the first and second support bases 2, 10 and screw holes 14a to 14d for fixing the two support bases 2, 10 are provided on the second support base. 10 is formed. On the other hand, a positioning reference hole and a fastening hole are formed in the first support base 2 at positions corresponding to the second support base 10. The positioning pins, holes and abutting portions of the first and second support bases 2 and 10 require high processing accuracy in order to accurately realize the relative position between the optical head 1 and the mounting table 7.

[0008]

However, in the above-mentioned conventional example, since the plurality of substrates 2 and 10 are laminated, it is difficult to realize a reduction in size and weight, and the mounting table 7 is difficult to achieve.
Since the relative position of the optical head 1 and the optical head 1 must be determined accurately, there is a problem that high precision is required for processing the bases 2 and 10 and the cost of parts increases.

An object of the present invention is to solve the above-mentioned problems,
It is an object of the present invention to provide an information recording / reproducing apparatus which realizes miniaturization and low cost by integrating a base.

[0010]

According to the present invention, there is provided an information recording / reproducing apparatus for recording / reproducing information by relatively moving a card-shaped information recording medium and an optical head. In a reproducing apparatus, a first device for supporting an optical head reciprocally with respect to the card-shaped recording medium.
, A second driving unit for supporting the card-shaped information recording medium in a reciprocating manner in a direction perpendicular to the optical head, and supporting the first driving unit and the second driving unit. A base to be fixed, the base being formed in a substantially rectangular parallelepiped box shape having an open upper or lower surface, wherein the first and second driving means are arranged in parallel to the opening of the base. It is characterized by the following.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the embodiments shown in FIGS. FIG. 1 is a side view of the embodiment,
FIG. 2 shows a bottom view. The base 20 is a substantially rectangular parallelepiped box-shaped housing having an opening 20a on the lower surface.
And a second mechanism for reciprocally driving the mounting table 22 on which is mounted.

The mounting table 22 has a function of holding the card C in a plane and reciprocating in the information track direction of the card C. The base 20 has two guide shafts 23.
Are mounted in parallel with each other, and the mounting table 22 is movably supported by the two guide shafts 23 by a slide bearing or the like (not shown). Further, an inner surface 20 b facing the opening 20 a side of the base 20 on both sides of the mounting table 22.
Is provided with a voice coil motor 24,
It is fixed to.

The voice coil motor 24 includes a coil 24 a mounted on the mounting table 22, a magnet 24 b and a yoke 2.
4c.
Is a driving source for reciprocating along the guide shaft 23. An optical position detector 25 such as a photo interrupter is attached to the base 20 at two places, and the mounting table 22 is detected by the detector 25 and the light shielding plate 26.
It is designed to reciprocate between locations.

The optical head 21 has a function of condensing a laser beam on the recording medium surface of the card C and positioning a condensed spot at a central portion between guide tracks formed on the card C. It moves in a direction orthogonal to the information track of the card C to reach a target information track. The mounting table 22 is provided inside the base 20.
The two guide shafts 27 orthogonal to the guide shaft 23 are fixed to the base 20, and the optical head 21 is movably supported on the two guide shafts 27 by sliding bearings. In addition, lead screw 28
So that the base 2 is parallel to the guide shaft 27.
The lead screw 28 is provided with a motor 29 and a gear 30 mounted on one surface of the base 20.
a, 30b and the like.

With such a configuration, the laser light from the optical head 21 is focused on the surface of the card medium, and the mounting table 22 reciprocates to record or reproduce information pits. At this time, in order to achieve stable recording / reproducing performance, it is important to relatively accurately position the mounting table 22 and the optical head 21. In the case where the base 20 is divided into two parts as in the conventional example, since the positional accuracy is ensured by increasing the processing accuracy of both, the parts become expensive.

In this embodiment, by using two bases 20 as one, it becomes easy to control the positional accuracy,
The size of the device can be reduced by reducing the cost of parts. Further, by forming the base 20 in a box shape, the rigidity can be improved as compared with the case where the base 20 is formed only with the frame,
Distortion of the positional relationship between the optical head 21 and the mounting table 22 due to twist or the like can be eliminated. Furthermore, since the box-shaped base 20 is assembled from one direction on the opening 20a side, for example, 1
Workability is improved as compared with the case where the two bases 20 are assembled from the front and back.

The laser light of the optical head 21 changes its characteristics depending on the temperature. However, since the laser light itself is a heating element, the laser light is easily radiated to the optical head 21 to reduce the influence of the temperature. There is a need. Inside the base body 20, the convection of the air is stagnant and the temperature easily rises.
On the 0a side, there is a convection, so that the temperature rise is less likely to occur than inside. Therefore, by arranging the optical head 21 on the side of the opening 20a of the box-shaped base 20, the influence of heat due to a temperature rise can be reduced. Further, if the opening 20a of the base 20 is arranged downward and the opposing surface 20b is the upper surface, it is possible to prevent the accumulation of dust on the mounting table 22 and the optical head 21 which are main parts.

[0018]

As described above, in the information recording / reproducing apparatus according to the present invention, the first and second driving means are provided on one base of a substantially rectangular parallelepiped having an opening on one surface. By arranging them in parallel, relative positional accuracy between the mounting table and the optical head can be ensured, so that downsizing and cost reduction can be realized.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment.

FIG. 2 is a bottom view.

FIG. 3 is a perspective view of a first unit of a conventional example.

FIG. 4 is a perspective view of a second unit of the related art.

FIG. 5 is a perspective view of a first support base of a conventional example.

FIG. 6 is a perspective view of a second support base of a conventional example.

[Explanation of symbols]

 Reference Signs List 20 base 20a opening 21 optical head 22 mounting table 23, 27 guide shaft 24 voice coil motor 25 photo interrupter 26 light shielding plate 28 lead shaft 29 motor 30a, 30b gear

Claims (4)

[Claims] 1. An information recording / reproducing apparatus for recording / reproducing information by relatively moving a card-shaped information recording medium and an optical head, wherein the optical head is supported reciprocally with respect to the card-shaped recording medium. First driving means, second driving means for supporting the card-shaped information recording medium so as to reciprocate in a direction perpendicular to the optical head, and first and second driving means. And a base for supporting and fixing the base. The base is formed in a substantially rectangular parallelepiped box shape having an open upper or lower surface, and the first and second driving means are parallel to an opening of the base. An information recording / reproducing apparatus characterized by being arranged. 2. The information recording / reproducing apparatus according to claim 1, wherein the opening is on a lower surface side of the base. 3. The information according to claim 1, wherein the first driving means is disposed on the side of the opening inside the base, and the second driving means is disposed on a surface facing the opening. Recording and playback device. 4. The information recording / reproducing apparatus according to claim 1, wherein said second driving means has a mounting table for holding said card-shaped information recording / reproducing medium.