JP2000182368A - Information recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a device thin by efficiently mounting an electric substrate without dividing it. SOLUTION: An electric substrate 29 is constituted within a horizontal face so that the mounting area can be the most effectively ensured, and the mounting parts are arranged on the both faces. Generally, flat parts are offered as a resistance or an IC or the like so that the mounting can be attained within the height of an area 29c which is 2-3 mm. On the contrary, it is necessary to use a part 29b whose height is large enough to be more than 7 mm for a capacitor which needs a large capacity. The part 29 whose height is large is arranged at an empty space position at the optical head 21 side so that this device can be made thinner by several mm than a conventional device.

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 that rotates a disk-shaped recording medium, an optical card that reciprocates a card-shaped recording medium, and an apparatus that uses 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.

[0004] Such an optical card recording / reproducing apparatus is generally of a table-top type placed on a desk or a table in an office, or a built-in type incorporated in the apparatus. On the other hand, recent information devices have been developed due to the development of digital communication technology and the development of communication networks.
It has been actively used not only in offices but also outdoors. Such information devices are called mobile devices, and have been rapidly spreading in recent years. Also, in optical cards, in order to make the most of the excellent portability of the card-like shape, the optical card recording / reproducing apparatus is required to be similarly miniaturized to improve portability.

FIGS. 7 and 8 are perspective views of an internal unit of a conventional optical card recording / reproducing apparatus, and FIG. 9 is a side view of the inside of the 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 for obtaining control and information signals, a laser, and the like. 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. 7 shows a first unit, in which an optical head 1 is supported by two shafts 3 attached in parallel to a support base 2 so as to be movable in the short direction of an optical card and moves to a target track. 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. 8 shows a second unit. The optical card is held on the mounting table 7 with both long sides sandwiched therebetween.
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.

As shown in FIG. 9, a first unit is a second unit.
The optical head 1 and the mounting table 7 are accurately positioned relative to each other, and are connected to each other. An open window (not shown) for transmitting laser light is formed below the support base 2 of the first unit. The combination of the first and second units is
It is fixed to the device chassis 11 via a vibration isolating member 12. Further, a plurality of mounts 13 are attached to the lower surface of the apparatus chassis 11, whereby the mounts 13 can be stably mounted on a desk, and interlock with the internal vibration isolator 12 to suppress external vibration. Is working.

The apparatus chassis 11 has a built-in electric board 14 as a control unit for controlling the optical head 1 and the mounting table 7, and this electric board 14 is disposed above the first unit, and 11 is fixed. The electric board 14 and each control target unit are connected by a flexible cable or the like. Also, an electric board 1 on which a large number of electric components forming a control circuit are mounted on both sides.
4 is arranged at a sufficient distance so that these mounted components do not come into contact with the first unit or the apparatus chassis 11.

With such a configuration, the laser light from the optical head 1 is focused on the surface of the optical card, and the information pits are recorded / reproduced by the reciprocating drive of the mounting table 7. At this time, in order to perform stable recording and reproduction, the optical head 1
And the mounting table 7 need to be relatively accurately positioned. For an optical information recording / reproducing apparatus, dustproofing is important for obtaining reliability over time. In general, measures are taken to remove dust by attaching a fan or filter to the device, or by completely covering the mechanism with a thin metal plate or the like to prevent dust from entering. ing.

[0011]

However, when miniaturizing the above-described conventional apparatus, it is important to reduce the size of the mechanical parts such as the optical head 1 and the mounting table 7 and to arrange the electric board 14 in the apparatus. Problem. In the conventional example,
Since the electric board 14 is arranged hierarchically above the mechanical section, it is necessary to provide a space for the maximum thickness of the members of the electric board 14, and it is difficult to reduce the dimension in the thickness direction. For this purpose, a method of dividing the electric board 14 into a plurality of parts and arranging them in an empty space in the apparatus is conceivable. However, increasing the number of the electric boards 14 leads to an increase in cost, and also increases the arrangement for connection, etc. Efficiency deteriorates. Therefore, in the configuration of the conventional example, there is a problem that it is difficult to reduce the thickness of the device beyond the limit of reducing the thickness of the electric board 14 and the mechanism.

Further, since the support base 2 for housing the optical head 1 and the support base 10 for housing the mounting table 7 are provided separately, it is necessary to accurately position the optical head 1 and the mounting table 7. The support bases 2 and 10 need to be formed with extremely high precision, and there is a problem that members are considerably expensive. Furthermore, the conventional dust-proofing measures require specialized parts only for dust-proofing, which increases the cost. In particular, if a fan or the like is provided, the overall size of the device becomes large, making it unsuitable as a mobile device. There is a point.

An object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide an information recording / reproducing apparatus which is efficiently mounted without dividing an electric board and which is made thinner.

[0014]

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 the reproducing apparatus, a first mechanism for reciprocatingly driving the optical head, a second mechanism for reciprocating the card-shaped information recording medium in a direction relatively orthogonal to the optical head, An electric board that performs overall control including a second mechanism, wherein the electric board, the first mechanism, and the second mechanism are sequentially arranged in a thickness direction, and A mounting component having a height greater than a distance between the electric substrate and the optical head is disposed at a position on a surface side facing the first mechanism and outside a moving range of the optical head. I do.

[0015]

DETAILED 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 first embodiment, FIG. 2 is a plan view of a first mechanism section including an optical head and the like, and FIG. 3 is a plan view of a second mechanism section including a mounting table and the like. Mounting components having a large height in the electric board are collected and arranged in an empty space where the components of the first mechanism section are not arranged, thereby realizing the thinning. The base body 20 is a substantially rectangular parallelepiped box-shaped housing having an open upper surface.
1 and a second mechanism for reciprocatingly driving the mounting table 22 on which the card is mounted.

The mounting table 22 has an area for holding a card of 86 mm × 54 mm or more in a plane, and has a function of reciprocating in the information track direction of the card within a range surrounded by a broken line in FIG. The base 20 has two guide shafts 2
3 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 (not shown) or the like. A drive source such as a voice coil motor (not shown) is arranged on the opening side of the base 20 on both sides of the mounting table 22, and the drive source is fixed to the base 20. The base 20 has optical position detectors 24 such as photo interrupters at two places.
The mounting table 22 is configured to reciprocate between two locations detected by the detector 24 and the light shielding plate 25.

The optical head 21 is formed to have an area of 40 mm × 30 mm or less. The optical head 21 focuses the laser beam on the recording medium surface of the card C, and focuses the laser beam on the center between the guide tracks formed on the card. It has the function of positioning the spot. The optical head 21 moves in a direction orthogonal to the information track of the card within a range surrounded by a broken line in FIG. 2 to reach a target information track. Inside the base 20, two guide shafts 26 orthogonal to the guide shaft 23 for the mounting table 22 are fixed to the base 20, and the optical head 21 is mounted on the two guide shafts 26 by sliding bearings. It is movably supported. A lead screw 27 is mounted on the base 20 so as to be parallel to the guide shaft 26. The lead screw 27 is connected to a transmission system including a motor 28 mounted on one surface of the base 20 and a gear (not shown). Are linked.

The base 20 on which the main mechanical parts of the optical head 21 and the mounting table 22 are mounted is an electric board 29 for controlling them.
The base 20 is fixed on the apparatus chassis 30 via a vibration isolating member 31. The electric board 29 is formed in a horizontal plane where the mounting area can be secured most effectively, and is fixed to the apparatus chassis 30. Further, the electric board 29 is disposed separately from the optical head 21 with the mounting table 22 and the optical head 21 interposed therebetween.

The electric board 29 is formed in a horizontal plane where the area can be secured most effectively in order to obtain a mounting area, and the mounted components are arranged on both sides. Generally, resistors, ICs, and the like are provided as flat components, so that they can be mounted within a height of 2 to 3 mm in a region 29a as shown in FIG. On the other hand, there is a chip type capacitor, but when a large capacity is required, as shown in FIG.
It is necessary to use a large part 29b having a height exceeding the height. Therefore, these large components 29b are arranged in an empty space on the optical head 21 side.

The electric board 29 has bosses 20a formed at the upper ends of both side walls on the opening side of the base 20, and is fixed by the bosses 20a. On the other hand, the electric board 29 and the main mechanism are connected by a control signal line, and a signal line such as an optical detection signal or a drive signal for auto focus or auto tracking is transmitted from the optical head 21 by a flexible cable. Wired.

With such a configuration, the laser beam from the optical head 21 is focused on the card medium surface, and the information pit is recorded or reproduced by the reciprocating drive of the mounting table 22.
At this time, in order to achieve stable recording and playback performance,
It is necessary to position the mounting table 22 and the optical head 21 relatively accurately. However, by using only one base 20, it is easy to control the positional accuracy, and it is possible to reduce the component cost and reduce the cost of the apparatus. Miniaturization can be achieved.
In addition, by forming the base 20 in a box shape, rigidity can be improved as compared with a case where the base 20 is formed only of a frame, and distortion of the positional relationship between the optical head 21 and the mounting table 22 due to twisting or the like can be eliminated. .

As shown in FIGS. 2 and 3, the optical head 21
The miniaturization is progressing, and the moving range of the mounting table 22 is smaller than that of the mounting table 22. Therefore, if the device area is constant, a large empty space is formed in the vicinity of the optical head 21, and mounting can be performed efficiently. That is, a component 29b having a large height is disposed in this space so as to be located below the upper surface of the optical head 21, and the electric board 29
For the height of the optical head 21 and 2-3 mm, 1
Since it can be arranged at a height with a space of about mm, it is possible to achieve a thickness reduction of about several mm as compared with the conventional example as a whole.

On the other hand, since the position of the electric board 29 and the mechanical section are in close contact, it is necessary to position the relative position to some extent accurately so that they do not buffer each other. By screwing to the upper end of the side wall of the device, the electric board 29 can be relatively accurately positioned with respect to the mechanical unit, rather than being attached to the apparatus chassis 30. In addition, by directly attaching the electric board 29 to the base 20, mutual interference can be prevented even when the mounting density is increased.

In the present embodiment, the main mechanism such as the optical head 21 and the mounting table 22 is provided inside the housing of the base body 20 to increase the mounting density inside the apparatus, thereby realizing a reduction in size and thickness. In addition, since the electric board 29 is disposed on the opening side so as to cover the entire opening, a barrier can be formed so as to surround the main mechanism, thereby preventing the accumulation of dust on the main mechanism. In addition, performance inferiority can be suppressed.
In addition, since the present embodiment only considers the arrangement in the apparatus chassis 30, it does not increase the size of the apparatus and does not increase the cost. Further, since the electric board 29 is enlarged so as to cover the opening, a sufficient mounting area can be secured.

Optical detection signals such as auto focus and auto tracking by a flexible cable are
Since a small current from the optical sensor is detected, it is preferable that the electric resistance of the circuit is small. In the present embodiment, by arranging the electric board 29 and the optical head 21 close to each other and shortening the length of the wiring, the circuit resistance can be reduced, the signal of the optical head 21 is stabilized, and Electromagnetic noise hardly occurs.

Further, in such an information recording / reproducing apparatus, there is a restriction on the generated electromagnetic noise, and it is necessary to reduce the electromagnetic noise generated by the circuit. A flexible cable connecting the optical head 21 and the electric board 29 is also one of the sources, but in this embodiment, the wiring can be shortened.
The amount of noise generated is reduced.

Although the electric board 29 is mounted on both sides,
When the mounting area of the circuit is reduced due to the custom IC or the like and single-side mounting is sufficient, the mounting surface may be set to the optical head 21 side, and the high component 29b may be similarly arranged in the empty space. By doing so, since there are no mounted components on the device chassis 30 side, the space can be reduced by the mounting height, and a further reduction in thickness can be realized.

In the above embodiment, the electric board 29, the optical head 21, and the mounting table 22 are sequentially arranged from the top, but the same effect can be obtained by disposing them in the reverse order.

FIG. 4 is a side view of the second embodiment, and FIG.
FIG. 6 shows a perspective view of the base and the electric board. In this embodiment, the optical head 41 is reciprocally driven in the information track direction within the base body 40, and the card mounting table 42 is moved in the direction orthogonal to the information tracks to perform recording and reproduction. Due to recent technical advances, the weight reduction of the optical head 41 has been accelerated, and the scanning speed of the optical head 41 can increase the moving speed more than the driving of the mounting table 42, thereby improving the recording / reproducing speed. Therefore, recently, this method has been adopted.

The optical head 41 is supported by a guide shaft 43, and is driven by a motor (not shown) to linearly reciprocate via a transmission system including a belt 44 and a pulley 45. A mounting table 42 is provided below the optical head 41.
The mounting table 42 is configured to move along a guide shaft 46 in a direction orthogonal to the information track.

In this embodiment, since the longitudinal wall side of the base 40 is an empty space, the electric board 47 is fixed at the end of the base 40 by the boss 40a.
The component 47a having a low height is disposed on the surface of the electric board 47, and the component 47b having a large height such as a capacitor is provided.
Are arranged outside the moving range of the optical head 41 indicated by the broken line in FIG. The base 40 is mounted on the device shaun 48 via a vibration isolating member 49.

Signal lines for control signals and drive signals are connected to each mechanism section and the electric board 47 by a flexible cable 50. As shown in FIG. Is connected to the electric board 47. In an optical card recording / reproducing apparatus, since a large number of signal lines are used, the number of flexible cables is large and the width of the flexible cables is wide. For this purpose, the connector 51 for connecting the flexible cable 50 to the electric board 47 needs to be disposed over two sides of the electric board 29 in the case of the first embodiment. In this case, the electric boards 47 can be collectively arranged on one long side.

As described above, since the flexible cable 50 can be arranged on one side, the electric board 47 can be opened and closed in the direction of the arrow without removing the flexible cable 50, thereby improving the workability during assembly. be able to.

[0034]

As described above, in the information recording / reproducing apparatus according to the present invention, the height is large on the surface of the electric board facing the first mechanism and outside the moving range of the optical head. By arranging the mounted components, the internal mounting density can be improved, and the overall structure can be reduced in thickness.

Further, since the length of the electric wiring between the electric substrate and the optical head is shortened, the control detection signal is stabilized and the generation of electromagnetic noise can be reduced. Therefore, even if the mounting density inside the device is increased due to miniaturization, highly reliable performance can be realized.

[Brief description of the drawings]

FIG. 1 is a side view of a first embodiment.

FIG. 2 is a plan view of a first mechanism unit.

FIG. 3 is a plan view of a second mechanism.

FIG. 4 is a side view of the second embodiment.

FIG. 5 is a plan view of a first mechanism unit.

FIG. 6 is a perspective view of a base and an electric board.

FIG. 7 is a perspective view of a first mechanism of a conventional unit.

FIG. 8 is a perspective view of a second mechanism.

FIG. 9 is a side view.

[Explanation of symbols]

 20, 40 Substrate 21, 41 Optical Head 22, 42 Mounting Table 23, 26, 43, 46 Guide Shaft 24 Photo Interrupter 25 Light Shield 27 Lead Shaft 28 Motor 29, 47 Electrical Board 30, 48 Device Chassis 31, 49 Vibration Isolator 50 Flexible cable 51 Connector

Claims (3)

[Claims] 1. An information recording / reproducing apparatus for recording / reproducing information by relatively moving a card-shaped information recording medium and an optical head, comprising: a first mechanism for reciprocatingly driving the optical head; A second mechanism for reciprocating the information recording medium in a direction relatively orthogonal to the optical head;
An electric board that performs overall control including the first and second mechanism sections, and the electric board, the first mechanism section, and the second mechanism section are sequentially arranged in a thickness direction, A mounting component whose height is larger than the distance between the electric board and the optical head is disposed on the surface of the electric board facing the first mechanism and outside the moving range of the optical head. An information recording / reproducing apparatus characterized by the above-mentioned. 2. A base on which the first and second mechanism parts are mounted, the base body is formed in a substantially rectangular parallelepiped box shape with one surface opened, and the first mechanism part is formed on an opening surface of the base. 2. The information recording / reproducing apparatus according to claim 1, wherein the information recording / reproducing apparatus is disposed on a side of the information recording / reproducing apparatus. 3. The information recording / reproducing apparatus according to claim 1, wherein the electric substrate is fixed to the base.