JPH08293189A - Optical information recording and reproducing device - Google Patents

Abstract

PURPOSE: To diminish the influence of resonance even when an exterior part is made to be light in weight and of low in rigidity. CONSTITUTION: 1st vibrationproof members 23 are fitted to the bottom surface of a recording and reproducing part 11. Then, 2nd vibrationproof members 27 are arbitrarily arranged in their plural places and fitted between the exterior part 12 consisting of a chassis 25 and a box-like case 26 fitted to the outer side of the chassis 25 and convering over the upper part and the recording and reproducing part 11, and then the chassis 25 is provided with holes 25a having enough room for the 1st vibrationproof members 23 to be passed through. Then, vibration from a base 10 is attenuated by the 1st vibrationproof members 23 to be transmitted to the recording and reproducing part 11, and is further attenuated by the 2nd vibration proof members 27 to be transmitted to the exterior part 12.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, an information recording / reproducing apparatus has a magnetic system and an optical system, and in recent years, the optical system has attracted attention. The optical system is for recording / reproducing information by using a light beam. The devices of this system are a disc-shaped recording medium such as a CD and a laser disc that rotate, and a card-shaped recording medium. There are those that make an optical card reciprocate. These optical information recording / reproducing apparatuses are properly used according to the purpose, but in each case, information tracks are formed on the surface of the recording medium at intervals of several μm, and the recording / reproducing unit in the apparatus has a structure for the recording medium. Then, the optical head is moved to form a minute spot of several μm between the information tracks by the light beam to record / reproduce information.

In such an optical information recording / reproducing apparatus, high recording density, large capacity, high access and high reliability are required. However, if external vibration is directly applied to the recording / reproducing section, information will be recorded. Since the light beam for recording / reproducing is shifted from the desired track and accurate recording / reproducing cannot be realized, it is necessary to protect the internal device especially from external vibration.

Therefore, in the conventional optical recording / reproducing apparatus, as shown in FIG. 6, a box-shaped exterior portion is constituted by a chassis 2 having a mount 1 attached to the bottom surface and a cover 3 integrated with the chassis 2. 4 is formed, chassis 2
The recording / reproducing unit 6 is mounted on the table 7 via the anti-vibration member 5 provided above.
The vibration isolating member 5 is mounted on the top and prevents external vibration from the table 7 from being transmitted to the recording / reproducing unit 6.

In such a structure, as shown in FIG. 7, when m is a mass, k is a spring constant, and c is a damper constant, external vibration is transmitted through the exterior portion 4 and the response magnification as shown below is obtained. It is transmitted to the recording / reproducing unit 7 at Ts. Ts = {1+ (2ζω / p) ² } ^1/2 / {(1-ω ² / p ² ) ² +
(2ζω / p) ² } ^1/2

Where ω is the angular frequency, p = (k / m)
^1/2 is the natural angular frequency, and ζ = c / {2 · (mk) ^1/2 } is the viscous damping rate.

As shown in the schematic diagram of FIG.
It becomes the next damping system. Ts is 1 or less in the range of ω / p> 2 ^1/2 regardless of the value of the viscous damping rate ζ, and the larger the value of ω / p, the greater the damping effect. Therefore, p <ωL / 2 for the lowest angular frequency ωL in the range of external vibration under the use environment
^It may be designed to satisfy ^1/2 . for that purpose,
it is necessary to make the anti-vibration system to satisfy the k <mωL ^2/2.

[0008]

Generally, the guaranteed range of use of external vibrations of an optical information recording / reproducing apparatus is 10 to 3 in general.
It is about 00 Hz. A rubber type vibration damping material is used for the vibration damping member 5, but the hardness must be considerably flexible in order to satisfy the natural frequency of 10 Hz or less. Therefore, although it is actually limited to a level of several tens Hz, if the exterior portion 4 is an ideal mass system, structural mechanical vibration is not induced. Therefore, if the viscous damping rate ξ can be increased to some extent, it is possible to sufficiently use the rubber type vibration damping material.

However, in reality, since the exterior portion 4 has a structural mechanical resonance frequency, it is necessary to enhance rigidity and set the resonance frequency to a frequency at which the damping effect of the rubber type vibration damping material is high. On the contrary, in order to reduce the weight of the device, measures such as reducing the plate thickness of the chassis 2 in the exterior part 4 and using the cover 3 with aluminum are taken, and the rigidity of the exterior part 4 is reduced. There is. Therefore, the exterior portion 4 itself has a resonance point having a frequency that is not significantly different from the natural frequency of the vibration isolating member 5, and as shown in FIG. 9, the peak due to resonance occurs in the frequency range where the vibration isolating member 5 has no damping effect. There is a problem in that the vibration will significantly protrude and the vibration damping effect of the device will be significantly reduced.

The object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide an optical information recording / reproducing device in which the influence of resonance on the device is small even if the exterior part is lightweight and has low rigidity.

[0011]

In order to achieve the above object, an optical information recording / reproducing apparatus according to a first aspect of the present invention focuses a light beam on an optical information card carriage medium to reproduce information on a card carriage. A linear reciprocating optical head for driving, a driving means for rotating or linearly moving the optical information card carriage medium, a main body base for mounting the optical head and the medium driving means, and surrounding the main body base. In an optical information recording / reproducing apparatus having an exterior part, the main body base is provided with a first anti-vibration member also serving as a mount, and a plurality of second anti-vibration members for holding the exterior part. It is characterized by that.

An optical information recording / reproducing apparatus according to a second aspect of the present invention is an optical head capable of linearly reciprocating for converging a light beam on an optical information recording medium to record / reproduce information. In the optical information recording / reproducing apparatus, there is provided a drive means for rotating or linearly moving the optical head, a main body base for mounting the optical head and the medium drive means, and an exterior part surrounding the main body base. Is provided with a plurality of anti-vibration members which also serve as mounts, and the anti-vibration members hold the exterior portion.

[0013]

In the optical information recording / reproducing apparatus according to the first aspect of the invention having the above-mentioned structure, the vibration from the table on which the apparatus is placed is attenuated by the first vibration isolating member and transmitted to the main body base, and the exterior The vibration from the part is attenuated by the second vibration isolating member and transmitted to the main body base.

In the optical information recording / reproducing apparatus according to the second aspect of the present invention, the vibration from the table on which the apparatus is placed is attenuated by the vibration isolating member and transmitted to the main body base without interposing the external part. Vibrations from the parts are also attenuated and transmitted by the same vibration isolation member.

[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 block diagram of the first embodiment, and the apparatus comprises a recording / reproducing section 11 supported by a base 10 and an exterior section 12. As shown in FIG. 2, the recording / reproducing unit 11 has a main body base 13 divided into an upper base 13a and a lower base 13b.
The pair of guide shafts 14 are moved in the left-right direction to the lower base 13.
A pair of guide shafts 15 are attached to b in parallel with each other in the front-rear direction of the drawing.

An optical head 17 having a lens 16 is supported on the guide shaft 14, and a card carriage 18 on which a card C as a recording medium is placed is mounted on the guide shaft 15 by a slide bearing or the like.
The upper base 13a and the lower base 13b are assembled by accurately positioned joint surfaces, and the optical head 17 and the card C are supported at a constant interval. .

A coil 19 formed by winding a conducting wire is attached to the optical head 17, and a magnetic circuit 20 composed of a magnet and a yoke constitutes a linear motor which travels in the X direction. Also, the lower base 1
3b is provided with a carriage driving motor 22 having a pulley 21. The pulley 21 and the carriage 18 are connected by a steel belt (not shown), and the motor 22 drives the carriage 18 to move in the Y direction, which is the front-back direction in the drawing. It is possible.

At the time of recording / reproducing, the carriage 18 moves in the Y direction which is the direction orthogonal to the information track,
The target track is positioned at the position where the laser beam L is focused by the lens 16. Then, while the optical head 17 linearly reciprocates in the X direction by the linear motor, the focused laser beam L is caused to follow the card information track to record / reproduce information.

As shown in FIG. 1, a first anti-vibration member 23 made of anti-vibration rubber or the like is attached to the bottom surface of the recording / reproducing section 11 and also serves as a mount for mounting the apparatus on the table 10. There is. The exterior part 12 is composed of a chassis 25 and a box-shaped case 26 attached so as to cover the outside and the upper part of the chassis 25, and the first vibration-proof member 23 is provided at the bottom of the chassis 25 with a margin. A through hole 25a is provided, and between the inner surface of the chassis 25 and the upper surface and the side surface of the recording / reproducing unit 11, a plurality of second anti-vibration members 27 made of anti-vibration rubber or springs are arbitrarily arranged. Installed.

In this apparatus, the exterior portion 12 is supported by the recording / reproducing section 11 by the second anti-vibration member 27, and the path from which the vibration from the table 10 on which the apparatus is placed is transmitted to the recording / reproducing section 11. The vibration from the base 10 is attenuated by the first vibration isolating member 23 and transmitted to the recording / reproducing unit 11 without being interposed inside, and further attenuated by the second vibration isolating member 27 and transmitted to the exterior unit 12. Therefore, the exterior part 12 does not resonate with the stand 10.
Therefore, the recording / reproducing unit 11 is not affected by the resonance of the outer casing 12, and the vibration from the table 10 is transmitted according to the damping characteristic of the first vibration isolating member 23. In addition, shock vibration that is directly applied to the exterior portion 12 is also attenuated and transmitted by the second vibration isolation member.

FIG. 3 shows a second embodiment of the recording / reproducing unit 1.
An anti-vibration member 30 made of anti-vibration rubber or the like is attached to the lower part of 1 and also serves as a mount for mounting the device on the base 10. In addition, the bottom surface of the chassis 25 has the chassis 25
Is formed in the columnar vibration damping member 30, and the groove 3 formed along the outer periphery of the vibration damping member 30 is provided with a hole 25b.
The peripheral edge of the hole 25b of the chassis is fitted and attached to 0a.

In the second embodiment, the path through which the vibration from the table 10 on which the apparatus is mounted is transmitted to the recording / reproducing section 11 and the path through which it is transmitted to the exterior section 12 are the same. Since the vibration members 30 are arranged side by side, the vibration from the table 10 is less transmitted to the recording / reproducing unit 11 via the outer casing 12, and the influence of resonance of the outer casing 12 on the recording / reproducing unit 11 is reduced. can do. Further, impact vibrations that are directly applied to the exterior portion 12 are attenuated and transmitted through a part of the vibration isolator 30, so that the influence thereof is reduced.

FIG. 4 shows the third embodiment. The vibration isolator 30 of the second embodiment is a vibration isolator 32 having an air bag 31 formed above the position where the chassis 25 is attached. The rigidity of the upper part of the vibration isolator 32 with respect to the mounting position of the chassis 25 is smaller than that of the lower part.
Therefore, the natural frequency of the transmission system from the table 10 to the recording / reproducing unit 11 can be reduced, and the natural frequency of the transmission system from the outer casing 12 to the recording / reproducing unit 11 can also be reduced.

On the contrary, by forming an air bladder below the mounting position of the chassis 25, the natural frequency of the transmission system from the table 10 to the recording / reproducing section 11 and from the table 10 to the exterior section 12 can be adjusted. Can be made smaller. Therefore, by changing the partial rigidity of the vibration isolating member 32 according to the desired characteristics of the transmission system, the table 10 can be changed from the recording / reproducing unit 11 to the table 10.
It is possible to adjust the characteristics of the transmission system from the outer casing 12 to the recording / reproducing unit 11.

FIG. 5 shows a fourth embodiment. This is one of the application examples of anti-vibration member with partially changed rigidity,
The vibration isolator 30 of the second embodiment is a vibration isolator 33 having a chassis mounting flange portion 33a provided on the peripheral surface thereof. Therefore, from the base 10 to the exterior part 12, the exterior part 12
It is possible to reduce the rigidity of the transmission system from the recording / reproducing unit 11 to the recording / reproducing unit 11 and reduce the transmission of vibrations from the table 10 to the recording / reproducing unit 11 via the exterior unit 12.

[0026]

As described above, in the optical information recording / reproducing apparatus according to the first aspect of the present invention, the vibration from the table on which the apparatus is placed is attenuated via the first vibration isolating member and is transmitted to the main body base. The vibration transmitted and transmitted to the main body base is attenuated by the second vibration isolating member and then transmitted to the exterior portion. Accordingly, even if the weight of the exterior portion is reduced, the main body base is not affected by the resonance of the exterior portion due to the vibration from the base, so that the vibration damping effect of the device is improved, and the weight is reduced and the reliability is improved. In addition, since shocking vibration that is directly applied to the exterior portion is damped by the second vibration isolating member, it is possible to reduce the influence on the main body base.

Further, in the optical information recording / reproducing apparatus according to the second aspect of the invention, the exterior portion is not interposed in the path through which the vibration from the table on which the apparatus is mounted is transmitted to the main body base, and the apparatus is mounted. Vibrations from the placed table are directly attenuated and transmitted to the main body base via the vibration isolating member. Further, the vibration applied to the exterior part by shock is also attenuated by the same vibration isolating member and transmitted to the main body base. Accordingly, even if the weight of the exterior portion is reduced, the main body base is not affected by the resonance of the exterior portion due to the vibration from the base, so that the vibration damping effect of the device is improved, and the weight is reduced and the reliability is improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment.

FIG. 2 is a configuration diagram of a recording / reproducing unit.

FIG. 3 is a configuration diagram of a second embodiment.

FIG. 4 is a configuration diagram of a third embodiment.

FIG. 5 is a configuration diagram of a fourth embodiment.

FIG. 6 is a configuration diagram of a conventional example.

FIG. 7 is a schematic diagram of the transmission system.

FIG. 8 is a characteristic diagram of a transmission system according to a schematic diagram.

FIG. 9 is a characteristic diagram of a transmission system of a conventional example.

[Explanation of symbols]

 10 units 11 recording / reproducing section 12 exterior section 23, 27, 30, 32, 33 anti-vibration member 25 chassis 26 cover 25a, 25b hole 30a groove 31 air bag 33a flange section

Claims (5)

[Claims] 1. A linear reciprocating optical head for focusing a light beam on an optical information card carriage medium to reproduce information on the card carriage, and a drive for rotating or linearly moving the optical information card carriage medium. Means and
In an optical information recording / reproducing apparatus having a main body base for mounting the optical head and the medium driving means, and an exterior portion surrounding the main body base, in the main body base,
An optical information recording / reproducing apparatus comprising: a first anti-vibration member also serving as a mount; and a plurality of second anti-vibration members for holding the exterior portion. 2. An optical head capable of linearly reciprocating for recording and reproducing information by converging a light beam on an optical information recording medium, and driving means for rotating or linearly moving the optical information recording medium. In an optical information recording / reproducing apparatus having a main body base on which the optical head and the medium driving means are mounted, and an exterior portion surrounding the main body base, a plurality of anti-vibration members also serving as mounts on the main body base. An optical information recording / reproducing apparatus, wherein: the vibration isolating member holds the exterior part. 3. The optical information recording / reproducing apparatus according to claim 2, wherein the vibration isolator partially changes the rigidity with respect to a holding position of the exterior part. 4. The optical information recording / reproducing apparatus according to claim 3, wherein the anti-vibration member is an anti-vibration rubber having an air bag in one side with a holding position of the exterior part as a boundary. 5. The optical information recording / reproducing apparatus according to claim 3, wherein the anti-vibration member is anti-vibration rubber provided with a flange portion at a holding position of the exterior portion.