JPH06309815A - Information recording and reproducing apparatus - Google Patents

Abstract

PURPOSE:To perform a stable recording and reproducing operation. CONSTITUTION:Vibration-proof members 3 are installed on both ends of a guide shaft 1. Thereby, even when vibrations of a spindle motor or the like are amplified by a base 5 made of an aluminum die-cast, the vibrations are not transmitted directly to the guide shaft 1 which guides a carriage 4 on which a head used to record and reproduce information has been mounted.

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 device such as a CD player and a video disc device, and more particularly to a carriage supporting mechanism thereof.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication No. 2-278576 discloses a carriage supporting mechanism including at least one carriage roller.
Disclosed is a structure in which a piece is rotatably attached to a pressing means extending in a direction substantially orthogonal to the moving direction of the carriage so as to press one piece from one guide rail side of the carriage to the other guide rail side. .

[0003]

The above-mentioned prior art has the following problems.

That is, since the guide shaft of the carriage is rigidly fixed to the aluminum die cast base, the resonance due to the rotation of the spindle motor matches the natural frequency of the aluminum die cast base and is amplified by the aluminum die cast base. It is transmitted to the movable part of the objective lens driving device via the guide shaft.

Further, since the yoke of the electromagnetic motor for moving the carriage in the seek direction is rigidly fixed to the aluminum die cast base, the reaction force of the seek motor (electromagnetic motor) is transmitted to the aluminum die cast base during seek operation. And it matches the natural frequency of aluminum die casting,
It is amplified by the aluminum die cast base and transmitted to the movable part of the objective lens driving device via the guide shaft.

In general, the natural frequency of an aluminum die cast base is approximately 1 kHz, and if resonance occurs in the movable part of the objective lens driving device in the vicinity of 1 kHz, accurate lens tracking cannot be performed. Information cannot be recorded or reproduced accurately, which causes a serious problem.

An object of the present invention is to provide an information recording / reproducing apparatus capable of performing stable recording / reproducing operation.

[0008]

In order to achieve the above object, the present invention provides a carriage having a head for recording / reproducing information on a plurality of guide shafts arranged in a movement path of the carriage. In an information recording / reproducing apparatus that is movably supported along a recording surface via a plurality of rollers that roll on a shaft, a vibration isolation member is provided at both ends of the guide shaft.

Further, elastic members are provided at both ends of the guide shaft, and the vibration isolating member is provided on an outer peripheral portion of the elastic member.

Further, a high-rigidity member covering the outer peripheral portion of the vibration isolating member is provided.

Further, the present invention is characterized in that a cap which covers both ends of the guide shaft and an oil filled between the cap and the end portion of the guide shaft have the function of the vibration isolating member.

A carriage carrying a head for recording / reproducing information is movably supported by a plurality of guide shafts arranged in the movement path of the carriage, and the carriage is moved along a recording surface by an electromagnetic motor. In the information recording / reproducing apparatus, the vibration isolating member is provided between the yoke and the yoke mounting base that constitute the electromagnetic motor.

[0013]

According to the information recording / reproducing apparatus having the above-mentioned structure, by providing the vibration-proof members at both ends of the guide shaft, even if the vibration of the spindle motor is amplified by the yoke mounting base, it is not directly transmitted to the guide shaft.

Further, by providing the elastic member between both ends of the guide shaft and the vibration isolating member, the vibration preventing efficiency is further enhanced.

Further, due to the high-rigidity member on the outer periphery of the vibration-proof member,
The shaft is positioned accurately, and the positional accuracy between the head and the information recording medium is improved.

Further, by adopting the oil damper mechanism, stable vibration damping action can be obtained even when the environmental temperature becomes low or high.

Further, since the vibration damping member is provided between the yoke of the electromagnetic motor for driving the carriage and the yoke mounting base, resonance due to the reaction force of the electromagnetic motor is not amplified by the yoke mounting base made of aluminum die casting or the like. .

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front sectional view of a carriage supporting mechanism according to a first embodiment of the present invention, in which a coil is bent in the same direction as the seek direction (arrow direction) of a carriage 4 having a head for recording / reproducing information. The elastic member 2 consisting of a spring is provided with a guide shaft 1 (two are installed, although not shown).
On the other hand, a cap-shaped vibration isolating member (butyl rubber or the like) 3 is provided on the outer peripheral portion of the elastic member 2. The anti-vibration member 3 is fixed to a base 5 made of aluminum die cast by a fixing metal fitting 6 and the like.

The carriage 4 moves along the recording surface of an information recording medium (not shown) via a plurality of rollers 7 rolling on the guide shaft 1 extending in the seek direction.

With such a configuration, even if the seek direction component of the rotational vibration of the spindle motor (not shown) is amplified by the base 5, the elastic member 2 and the vibration isolating member 3 cause the vibration to the guide shaft 1. Not transmitted. Therefore, stable lens tracking and carriage servo can be realized, and driving reliability is improved. Further, since the elastic member 2 and the vibration isolating member 3 have different hardnesses, there is an effect that vibrations in a wide frequency band can be absorbed.

FIG. 2 is a front sectional view of an essential part of the carriage supporting mechanism in the second embodiment, and FIG. 3 is a side sectional view showing a fixed state of the essential part of FIG. The outside of the member 3 is covered with a metal cap-shaped high-rigidity member 8.

By providing the high-rigidity member 8 in this manner, when the guide shaft 1 is fixed to the base 5, even if the guide shaft 1 is fixed by the fixing spring 9, the vibration-proof member 3 is not deformed. The position of the shaft 1 in the focusing control direction (FO direction) can be accurately determined. Further, since the vibration isolating member 3 is not deformed, its vibration isolating property is not deteriorated and a sufficient vibration isolating effect is obtained.

FIG. 4 is a front sectional view of the main part of the carriage supporting mechanism in the third embodiment, in which the guide shaft 1 is provided with a concave groove 1a, and an oil seal (O-ring) 10 is fitted in the concave groove 1a to guide the guide. Caps 11 are fitted on both ends of the shaft 1. Damping oil 12 is enclosed in the cap 11 to absorb the vibration transmitted from the base 5.

With this structure, a stable vibration damping effect can be realized even when the environmental temperature of the driving section becomes low or high, so that the driving reliability can be improved (generally, butyl rubber or the like). The hardness of the anti-vibration member is significantly changed by the temperature change, so the anti-vibration effect is changed).

FIG. 5 is a perspective view of a carriage supporting mechanism in the fourth embodiment, and FIG. 6 is a vertical sectional front view of a portion A of FIG.
In the fourth embodiment, a vibration isolation member 15 is provided on a fixed portion of a yoke 14 of a seek motor 13 which is an electromagnetic linear motor for moving the carriage 4 along a recording surface and a base 5 made of aluminum die cast. .

The seek motor 13 has a space 14a at the center.
And a permanent magnet 16 fixed to the inside of the yoke 14, and a seek motor fixed to the side of the carriage 4 and loosely fitted to the side of the yoke 14 opposite to the fixed side of the permanent magnet 16. It consists of coil 17.

In FIG. 5, generally, when the seek operation is performed, the seek motor coil 17 has a natural frequency in the seek direction, so that the reaction force of the vibration is transmitted to the yoke 14 and amplified by the base 5. Then, the seek motor coil 17 becomes a vibration source. Therefore, by providing a vibration isolator 15 between the yoke mounting portion of the base 5 and the overhanging portion 14b of the yoke as shown in the figure, vibration transmission from the yoke 14 to the base 5 can be prevented, and the base 5 can be prevented from being transmitted to the guide shaft. The wraparound of vibration to 1 can be reduced.

Explaining in detail with reference to FIG. 6, a plate-shaped vibration damping member 15 is placed on the base 5, and the yoke 14 is placed thereon.
The protruding portion 14b of the yoke 14 is placed, and the protruding portion 14b of the yoke 14 is fixed with the set screw 20 through the hollow cylindrical vibration damping member 18 having the collar portion and the collar 19, the plate vibration damping member 15 and the base. Lock 5 By doing so, even if the elastic member 2 is not provided, the first
The same effect as the embodiment is obtained.

FIG. 7 is a front sectional view of an essential part of a carriage supporting mechanism in the fifth embodiment, in which a cap-shaped vibration isolating member (butyl rubber or the like) 21 is provided at both ends of the guide shaft 1. The effect is the same as that of the first embodiment. The cost is reduced because there is no elastic member 2.

[0031]

As described above, according to the information recording / reproducing apparatus of the present invention, according to the constitution of claim 1, the vibration of the spindle motor is based on the vibration by providing the vibration-proof members at both ends of the guide shaft. Even if it is amplified, it is not directly transmitted to the guide shaft, so the head can perform stable tracking during recording / playback, which improves drive reliability and even when disturbance in the seek direction is added to the drive force. Since the external vibration is reduced by the vibration isolation members at both ends of the guide shaft, stable tracking can be performed.

According to the second aspect of the invention, by providing the elastic member between both ends of the guide shaft and the vibration isolating member, the vibration preventing efficiency can be further enhanced.

According to the third aspect of the present invention, the high-rigidity member at the outer peripheral portion of the vibration-proof member ensures the shaft positioning, and the positional accuracy between the head and the information recording medium is improved. For example, in the case of an optical head, the variation in working distance between the objective lens and the information recording medium can be reduced,
The movable range of the objective lens driving device in the focusing direction is small, and as a result, the objective lens driving device can be downsized.

According to the fourth aspect of the present invention, by adopting the oil damper mechanism, stable vibration damping action can be obtained even when the environmental temperature of the driving section becomes low or high, and the driving reliability is improved. Can be improved.

According to the fifth aspect of the present invention, the vibration isolating member is provided between the yoke of the electromagnetic motor and the yoke mounting base, so that the resonance caused by the reaction force of the electromagnetic motor is amplified by the base. Since this can be prevented, stable tracking at the time of recording / reproducing can be performed, and drive reliability can be improved.

[Brief description of drawings]

FIG. 1 is a front sectional view of a carriage supporting mechanism in a first embodiment of an information recording / reproducing apparatus of the present invention.

FIG. 2 is a front sectional view of a main part of a carriage support mechanism according to a second embodiment of the present invention.

FIG. 3 is a side sectional view showing a fixed state of a main part of the second embodiment.

FIG. 4 is a front sectional view of a main part of a carriage support mechanism according to a third embodiment of the present invention.

FIG. 5 is a perspective view of a carriage support mechanism according to a fourth embodiment of the present invention.

FIG. 6 is a vertical sectional front view of a portion A of FIG.

FIG. 7 is a front sectional view of a main part of a carriage supporting mechanism according to a fifth embodiment of the present invention.

[Explanation of symbols]

1 ... Guide shaft, 2 ... Elastic member, 3, 15, 18,
21 ... Anti-vibration member, 4 ... Carriage, 5 ... Aluminum die cast base, 6 ... Fixing metal fitting, 7 ... Roller,
8 ... High rigidity member, 10 ... Oil seal, 11 ... Cap, 12 ... Oil, 13 ... Seek motor (electromagnetic motor),
14 ... Yoke, 14b ... Yoke overhang, 15 ... Permanent magnet, 17 ... Seek motor coil.

Claims (5)

[Claims] 1. A recording surface on which a carriage having a head for recording / reproducing information is mounted on a plurality of guide shafts arranged in a moving path of the carriage, through a plurality of rollers rolling on the guide shafts. In an information recording / reproducing apparatus which is movably supported along the information recording / reproducing apparatus, a vibration damping member is provided at both ends of the guide shaft. 2. The information recording / reproducing apparatus according to claim 1, wherein elastic members are provided on both ends of the guide shaft, and the vibration isolating member is provided on an outer peripheral portion of the elastic member. 3. The information recording / reproducing apparatus according to claim 1, further comprising a high-rigidity member covering an outer peripheral portion of the vibration isolating member. 4. The function of the vibration isolating member is provided by caps covering both ends of the guide shaft, and oil enclosed between the cap and the end portions of the guide shaft. 1. The information recording / reproducing apparatus described in 1 or 2. 5. A carriage carrying a head for recording / reproducing information is movably supported by a plurality of guide shafts arranged in a moving path of the carriage, and the carriage is moved along a recording surface by an electromagnetic motor. In the information recording / reproducing apparatus to be moved, an anti-vibration member is provided between a yoke constituting the electromagnetic motor and a yoke mounting base.