JP2002230957A - Driver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driver which is strong to impact by providing the driver with a mechanism for attenuating an impact exerted from the outside. SOLUTION: The driver including a casing and a mechanical chassis having a drive mechanism section which is built into the casing and is used to reproduce a recording medium or to record data to the recording medium is provided with impact-attenuating dampers for attenuating the impact separately from vibration-attenuating dampers for attenuating vibrations between the casing and the mechanical chassis.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CD-ROM,
DR, CD-RW, DVD-ROM, DVD-RAM
And a drive device for driving a recording medium such as

[0002]

2. Description of the Related Art In order to read or record data and software inside a computer or connected to the outside of a computer,
CD-ROM, CD-R, CD-RW, DVD-RO
2. Description of the Related Art A drive device that drives various recording media (hereinafter, simply referred to as media) such as an M and a DVD-RAM has been conventionally known. These drive devices usually have a structure in which a mechanical chassis on which a mechanism such as an optical pickup is mounted is housed in a housing.

FIG. 3 schematically shows a mechanical chassis. A mechanical chassis 10 includes a chucking unit 11 for rotatably mounting a medium, and an optical pickup 1 that moves in a tracking direction of the medium and reads and writes data on a recording medium.
2 and a spindle motor (not shown) for rotating the medium are provided as a drive mechanism. The mechanical chassis 10 is configured by assembling a plurality of metal plates. In an example illustrated in FIG. 1, the mechanical chassis 10 stores a metal plate 13 serving as a base, a spindle motor, a guide shaft of the optical pickup 12, and the like. For this purpose, the second metal plate 13 which is arranged at a predetermined distance from the metal plate
Metal plate 14 and a third
Metal plate 15. In the mechanical chassis 10, the media is arranged between the third metal plate 15 and the second metal plate 14.

[0004] At four corners of a metal plate 13 serving as a base of such a mechanical chassis 10, anti-vibration rubbers 16 for damping vibration are provided.
(Damper for vibration damping) is installed. Anti-vibration rubber 16
Is formed in a cylindrical shape in which a through hole 17 penetrating the inside in the longitudinal direction is formed. Anti-vibration rubber 16 having such a shape
Is inserted into the notch 13a of the base metal plate 13 at substantially the center in the longitudinal direction, and both ends in the longitudinal direction are provided so as to protrude from both surfaces of the metal plate 13. The position where the vibration isolating rubber 16 is mounted on the metal plate 13 is a portion of the mechanical chassis 10 where a mounting hole for the housing is formed. That is, the mounting hole of the metal plate 13 communicates with the through-hole 17 of the vibration-proof rubber 16, and a boss of a casing described later is inserted. The mechanical chassis 10 is thus attached to the housing via the vibration-proof rubber 16.

FIG. 4 schematically shows a conventional drive device in which a mechanical chassis is mounted in a housing. However, in this drawing, the detailed shapes of the mechanical chassis and the housing, such as the boss described above, are shown in a simplified manner. The mechanical chassis 10 is connected to the housing 1 via the vibration isolating rubber 16 as described above.
8 is installed inside. By installing the mechanical chassis 10 in the housing through the vibration isolating rubber 16, vibration generated in the mechanical chassis 10 due to driving of a spindle motor for rotating the medium is prevented from being transmitted to the housing. It can be attenuated by the vibration rubber 16. That is, by providing the vibration isolating rubber 16, the vibration generated inside the drive device is not transmitted to the outside of the drive device, so that the entire drive device does not vibrate.

[0006]

As described above, the mechanical chassis is attached to the housing via a vibration-damping damper such as a vibration-proof rubber. This vibration damping damper has a relatively low hardness, and attenuates the vibration by increasing the difference between the vibration of the mechanical chassis and the resonance frequency of the housing. Such a vibration damping damper is very effective for damping vibrations that repeat fine reciprocating motion.

[0007] However, it has been found that such a vibration damper having a low hardness is not very effective against only one external impact. That is, 1
When a single impact is applied to the above-described conventional drive device from the outside, the vibration damping damper is first compressed to some extent until bottoming occurs, and then compressed, and the hardness rapidly increases. For this reason, when a shock that is small enough to prevent the vibration damping damper from bottoming is applied,
Although the shock can be absorbed, no further shock can be absorbed if the vibration damping damper is bottomed.

A further explanation will be given of a case where a shock is applied to the vibration damper until a bottom is formed. The mechanical chassis to which the shock is transmitted is provided with a vibration damper having a low hardness until the bottom is formed. The impact is transmitted via the vibration damping damper whose hardness is increased by the bottoming, and the impact is not transmitted at a constant acceleration. As described above, the shock transmitted to the mechanical chassis is not constant with the vibration damper alone, but the acceleration rapidly increases, and as a result, the peak value of the acceleration increases. For this reason, there is a problem that a mechanical chassis having many mechanically vulnerable parts may cause damage to the parts. Particularly, in the drive device, since the optical pickup is a fragile component, the impact given from outside the drive device is amplified, and the optical pickup may receive a large impact.

In a conventional drive device, there is no concept of attenuating an external impact, and the mechanical chassis and the housing are in parallel contact with each other so as not to transmit the vibration generated in the mechanical chassis to the housing. Only the vibration damper is provided at the part. For this reason, in particular, when an impact including a directional component parallel to the medium is applied from the outside of the drive device, the impact cannot be attenuated, and the mechanical chassis receives an impact. However, there is a problem that the components provided in the optical pickup, in particular, the optical pickup may be damaged.

Further, in recent years, the weight of the entire drive device has been reduced, and in particular, the fragility of the optical pickup has been spurred. That is, the optical axis of the optical pickup is adjusted by a plurality of components such as a laser diode and a half mirror, and each component having no flexibility is likely to be displaced due to slight distortion of the mounted housing. The optical axis is easily deviated by impact. In such a situation, it is necessary to increase the size and strictness of the packaging of the drive device during transportation, which leads to a problem that the transportation cost is increased when the product is shipped.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a drive device which is provided with a mechanism for attenuating an externally applied impact to provide a drive device which is resistant to an impact. It is in.

[0012]

That is, according to the drive apparatus of the present invention, a housing and a drive mechanism incorporated in the housing for reproducing a recording medium or recording data on the recording medium are provided. A drive device comprising a mechanical chassis having a shock-absorbing damper for attenuating a shock separately from the vibration-damping damper for attenuating vibration between the housing and the mechanical chassis. And By employing this configuration, an externally applied impact is attenuated by the impact attenuating damper. For this reason, the impact can be prevented from being transmitted to the mechanical chassis, and a drive device resistant to the impact can be obtained.

[0013] The impact damping damper is provided between an end face of the mechanical chassis and the housing face facing the end face. According to this configuration,
Even when an impact having a component parallel to the mechanical chassis is applied from the outside, the impact is attenuated between the housing and the end surface of the mechanical chassis.

Further, the shock attenuating damper is provided at a position where the shock in the tracking direction of the optical pickup is attenuated in order to protect the optical pickup in the drive mechanism from a shock. May be a feature. According to this configuration, it is possible to attenuate an impact including a tracking direction component of the optical pickup applied from the outside, and it is possible to protect the optical pickup which is particularly mechanically weak.

[0015]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, as a drive device, CD-ROM, CD-R, CD-RW,
An apparatus for driving a recording medium such as a DVD-ROM and a DVD-RAM is conceivable. However, the present invention is not particularly limited to any one of the devices, and any recording medium may be driven.

(First Embodiment) First, FIG. 1 shows a perspective view of a housing of a drive device. The housing 30 is made of a synthetic resin, and is entirely formed in a box shape whose upper side (the front side in FIG. 1) is open. A mechanical chassis is mounted inside the housing 30, but is not shown in FIG. The mechanical chassis has exactly the same structure as that described in the related art as shown in FIG. 3, and the mechanical chassis as shown in FIG. 3 is attached to the housing 30 in FIG. And Therefore, illustration and description of the detailed structure of the mechanical chassis are omitted here.

A structure for mounting the housing 30 and the mechanical chassis 10 will be described. Inside the housing 30, a plurality of bosses 32 for mounting the mechanical chassis project upward from the inner bottom surface 30a (from the back toward the front in FIG. 1). Each of the bosses 32, 32,...
It is inserted into a through hole 17 of a vibration-proof rubber 16 (an example of a vibration-damping damper) attached to the mechanical chassis 10 to position and attach the mechanical chassis 10 and the housing 30.

Next, a description will be given of a shock damping damper for damping a shock. On an inner bottom surface 30a of the housing 30, a rib 34 for attaching a damper for damping an impact is formed, and a damper 36 for damping an impact is attached to the rib 34. The plurality of ribs 34 are formed so as to protrude from the inner bottom surface 30a, and the shock damping damper 36 is attached to the plurality of ribs 34 with an adhesive. The shock damping damper 36 described here is in a gel form. As such a gel-like impact damper, specifically, sorbosein may be used. The thickness of the shock attenuating damper 36 is about 3 mm, and a substantially flat plate is used.

The shock attenuating damper 36 attached to the rib 34 is provided on a plane orthogonal to the tracking direction of the optical pickup 12 (the direction of arrow A in FIG. 1).
In other words, the shock attenuating damper 36 is provided at a position where its surface rises perpendicularly to the inner bottom surface 30a of the housing 30 and comes into contact with the end surface of the mechanical chassis 10 installed in parallel with the inner bottom surface 30a. ing. Note that the clearance between the shock damping damper 36 and the mechanical chassis 10 only needs to be large enough to prevent contact when no shock is input.

Since the drive device of the present embodiment adopts such a structure, the optical pickup 1
When an impact is input from the tracking direction 2 (the direction of arrow A in FIG. 1), the impact from the housing 30 can be attenuated by the impact attenuation damper 36 and transmitted to the mechanical chassis 10 side. That is, the impact of the optical pickup 12 in the tracking direction is attenuated, and the optical pickup 1
2 to prevent breakage.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. Note that the mounting structure between the housing 30 and the mechanical chassis 10 in this drawing is the same as that in the above-described embodiment, and a description and illustration thereof are omitted here. On the lower surface of the mechanical chassis 10 (the inner bottom surface 30a side of the housing 30),
(In the direction of the inner bottom surface 30a), a columnar shock-absorbing projection 40 is formed. On the other hand, case 3
0 is at a position corresponding to the protrusion 40 of the mechanical chassis 10,
An insertion hole 42 into which the projection 40 can be inserted is formed. Then, when the mechanical chassis 10 is attached to the housing 30,
The projection 40 is inserted and arranged in the insertion hole 42.

A shock damping damper 44 is attached to the inner wall surface of the insertion hole 42. The clearance between the inner wall surface of the shock attenuating damper 44 and the outer wall surface of the projection 40 may be such that almost no contact occurs when no shock is input, as in the case described in the first embodiment.

According to the second embodiment, even when a shock is input to the housing 30, the shock is damped by the shock damper 44 and transmitted to the mechanical chassis 10. it can. The protrusion 40 has a cylindrical shape,
Since the damper 44 is also provided so as to surround the periphery of the columnar projection 40, in the present embodiment, it is possible to satisfactorily attenuate a shock from any direction on a plane parallel to the mechanical chassis 10.

Further, in the present embodiment, a projection for damping impact is provided which protrudes from the inner bottom surface 30a of the housing 30 to the mechanical chassis 10 side. That is, a cylindrical projection 48 made of synthetic resin and formed integrally with the housing 30 is formed on the inner bottom surface 30 a of the housing 30 so as to protrude, and the projection 48 of the housing 30 is inserted into the mechanical chassis 10. An insertion hole 50 to be formed is formed, and when the mechanical chassis 10 is attached to the housing 30, the projection 48 of the housing 30 is provided so as to be inserted into the insertion hole 50 of the mechanical chassis 10. An impact damper 44 is attached to the inner wall surface of the insertion hole 50. Then, even when an impact is applied from any direction on a plane parallel to the mechanical chassis 10, the impact can be attenuated by the projection 48 and the impact damper 44.

In the embodiment shown in FIG. 2, both the projection 48 projecting from the mechanical chassis 10 and the projection 40 projecting from the housing 30 are provided. May be simply provided. Also,
As the direction in which the projections protrude, one that protrudes in one of the directions may be provided at two places.

Although the description has been made that both the projections 40 and 48 are columnar, the shape of the projections is not limited to the columnar shape. Therefore, if the projections 40 and 48 are formed in a plate shape and the side having a large area of the plate shape is arranged at a position orthogonal to the tracking direction, the shock can be improved particularly when a shock is applied from the tracking direction. Can be attenuated.

In addition, the shock damper 44 of the present embodiment
It is preferable to use a gel as in the first embodiment. Specifically, it is preferable to use sorbosein. Since the damper is in the form of a gel, it can effectively attenuate the impact when a single impact is applied, instead of attenuating the vibration that is a fine reciprocating motion. Further, the insertion holes 42 and 50 and the shock damper 44
Can be performed by using an instant adhesive.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a shock is applied to a drive device, and a shock damping damper is not provided. In addition, as described in the first embodiment, a shock damping is applied to an inner wall surface of a housing at a position facing an end surface of a mechanical chassis. Compared with the case where a damper for
The result of an experiment on how much the shock is actually attenuated is shown.

First, in the first row of Table 1, when a drive device without a damper for damping shock is dropped from a drop height of 60 cm, an optical pickup mounted on a mechanical chassis with respect to an input acceleration. 3 shows the response acceleration. In this experiment, acceleration was measured for each of ten separate drive devices by the same method, and the average value was obtained.

[Table 1]

Here, the reason that the response acceleration is larger than the input acceleration is that a pulse having an action time that responds to a waveform is input to the mechanical chassis 10 on which the optical pickup is mounted. Because it is. As shown in the first row, in the case without a damper, the magnitude of the response acceleration is about eight times the magnitude of the input acceleration.

On the other hand, in the drive device provided with the shock attenuating damper at the position described in the first embodiment, the response acceleration of the optical pickup when a shock due to a drop is given is calculated as 4 from the second row in Table 1. Shown by line. Here, the same experiment is performed by changing the hardness of the shock damping damper. The shock-damping damper provided in the drive device is 3 mm thick sorbosein.

The second row in Table 1 shows that the shock-damping damper has a high hardness. When this hard damping damper is installed, the response acceleration of the optical pickup is
The value is about 8.7 times the input acceleration. Table 1
In the third row, the impact damper has a soft hardness. When the impact damper having the soft hardness is mounted, the response acceleration of the optical pickup is about 5.7 times the input acceleration. In the fourth row of Table 1, the hardness of the shock-damping damper is intermediate between the hardnesses of the shock-damping dampers in the second and third rows. When the shock absorber having the intermediate hardness is mounted, the response acceleration of the optical pickup is 11.3 with respect to the input acceleration.
It is twice the value.

Accordingly, in Table 1, it can be seen that the provision of the shock-damping damper having a low hardness reduces the response acceleration in response to the input acceleration.
For this reason, by providing the shock attenuating damper having a soft hardness, it is possible to attenuate the impact due to the drop and provide a drive device that is strong against the impact. However, when the hardness is high and the hardness is intermediate, the response acceleration increases rather than when the shock damper is not provided, so it is better not to install such a shock damper. Care must be taken with regard to the hardness of the shock damping damper.

Further, the larger the area of the shock-damping damper is, the better it is not. The response magnification of the acceleration may be the minimum value in a certain predetermined area. this is,
By changing the area of the shock-damping damper and repeating the above-described experiment, it could be estimated. As a result of the experiment, the area of the shock-damping damper in the present embodiment is 200 irrespective of the hardness of the shock-damping damper.
By using of the order of mm ² to 300 mm ^2,
It was found that a minimum response magnification was obtained. Thus, as the damper shock damping in this embodiment, it was found that those hardness soft low may be mounted in an area of about 200 mm ² to 300 mm ^2.

Incidentally, the shock-damping damper is not limited to a gel-like damper as in the above embodiment.
An elastic body having a higher hardness than the vibration damper can be used. For example, even when rubber, sponge, oil-sealed rubber, or the like is used, the impact can be satisfactorily attenuated.

As described above, the vibration damping damper for damping vibration and the shock damping damper for damping shock are provided between the housing and the mechanical chassis, respectively.
Since not only the vibration but also the external impact can be attenuated, the drive device can be prevented from being damaged.

Although the present invention has been described in detail with reference to the preferred embodiments, the present invention is not limited to these embodiments, and many modifications may be made without departing from the spirit of the invention. Of course.

[0038]

According to the drive device of the present invention, the shock damping damper for damping shock is provided between the housing and the mechanical chassis, separately from the vibration damping damper for damping vibration. Even when an external impact is applied, the impact can be attenuated by the damper so that the impact is not transmitted to the mechanical chassis. Further, since the impact can be attenuated, it is not necessary to pack the product strictly at the time of product shipment, so that the cost of transportation can be reduced.

Further, since the shock attenuating damper is provided between the end face of the mechanical chassis and the housing surface facing the end face, an impact having a component parallel to the mechanical chassis is applied from the outside. Even in this case, the impact is attenuated between the housing and the end face of the mechanical chassis.

Further, if the shock attenuating damper is provided at a position where the shock in the tracking direction of the optical pickup is attenuated in order to protect the optical pickup in the drive mechanism from the shock, the tracking direction of the optical pickup applied from outside may be provided. An impact including components can be attenuated, and particularly, a mechanically fragile optical pickup can be protected.

[Brief description of the drawings]

FIG. 1 is a perspective view of a housing of a drive device according to the present invention.

FIG. 2 is an explanatory view showing a second embodiment of a portion where a damper is mounted.

FIG. 3 is a perspective view of a mechanical chassis.

FIG. 4 is an explanatory view showing a conventional mounting structure of a portion where a damper is mounted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Mechanical chassis 11 Chucking part 12 Optical pick-up 13, 14, 15 Metal plate 16 Anti-vibration rubber 17 Through-hole 30 Drive device 32 Boss 34 Rib 36, 44 Shock damping damper 40, 48 Projection 42, 50 Insertion hole

Claims (3)

[Claims] 1. A drive device comprising: a housing; and a mechanical chassis incorporated in the housing and having a drive mechanism for reproducing a recording medium or recording data on the recording medium. A drive device comprising a shock attenuating damper for attenuating a shock separately from a vibration damping damper for attenuating vibration between the mechanical chassis. 2. The drive device according to claim 1, wherein the shock attenuating damper is provided between an end surface of the mechanical chassis and the housing surface facing the end surface. 3. The shock-absorbing damper is provided to protect the optical pickup in the drive mechanism from a shock.
3. The drive device according to claim 1, wherein the drive device is provided at a position where an impact of the optical pickup in a tracking direction is attenuated.