JPH0696566A - Vibroisolating mechanism of information recording/ reproduction device - Google Patents

Abstract

PURPOSE:To provide a vibroisolating mechanism including a vibroisolating material whose spring constant is nearly constant and having stable vibroisolating characteristic even if an information recording/reproduction device releases heat are reaches a high temperature due to the continuous high-speed drive of an actuator. CONSTITUTION:A vibroisolating mechanism is constituted by a mount frame 15 for mounting the title device to a customer side enclosure, a screw 14 for connecting it to a base 2, and vibroisolating rubber 13 which is laid out between the mount frame 15 and the screw 14 and when temperature compensation members 24a and 24b are placed inside the vibroisolating rubber 13. With this configuration, the temperature compensation members 24a and 24b are deformed reversibly according to the ambient temperature change, thus compressing and deforming one part of the vibroisolating rubber 13 and maintaining the spring constant of the vibroisolating rubber 13 to be nearly constant.

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, and more particularly to a vibration isolation mechanism having a stable vibration isolation effect even when ambient temperature changes.

[0002]

2. Description of the Related Art Information recording / reproducing apparatuses according to the present invention include a magnetic disk device, an optical disk device and a magnetic tape device. Here, the magnetic disk device will be taken up and described.

FIG. 14 shows an example of a conventional magnetic disk device. The information recording disk 1 having a laminated structure is rotationally driven at a constant rotational speed by a disk rotational drive motor 3 fixed on a base 2. A carriage 6 arranged beside the information recording disk 1 is provided with a head 6 via a head supporting spring 5, and the head 6 floats with respect to the information recording disk 1 with a minute gap and records / reproduces information. I do.

The high-speed and high-accuracy positioning of the head 6 is performed by rotating the carriage 4 by a voice coil motor 7. The voice coil motor 7 comprises a drive coil 8 and a magnetic circuit 9, and the drive coil 8 is the carriage 4
The magnetic circuits 9 are fixed to the base 2, respectively.
A rotary shaft 10 is fixed on the base 2, and a carriage 4 is supported by a ball bearing 11 arranged on the rotary shaft 10, so that the carriage 4 can rotate around the rotary shaft 10.

The above-mentioned information recording disk 1, carriage 4, voice coil motor 7 and the like are closed by a cover 12 which is screwed to the base 2. Further, in order to attach the magnetic disk device to a customer-side casing (not shown), the base 2 is provided with an anti-vibration rubber 13 and a screw 14.
The mount frame 15 is provided via the.

The head 6 has a position demodulation circuit 16
Via the A / D converter 17 and the microcomputer 18
It is connected to the. And the microcomputer 18
Are connected to the disk rotation drive motor 3 via the disk drive circuit 19 and to the voice coil motor 7 via the D / A converter 20 and the voice coil motor drive 21, respectively.

By the way, the magnetic disk device receives an internal vibration excited by the rotary motion of the carriage 4 and the rotary motion of the disk rotary drive motor 3, and an external vibration applied from the outside of the device. The head 6 and the disk 1 which absorb the energy of these vibrations as much as possible and hinder the positioning.
The device is equipped with the above-mentioned vibration-proof mechanism (vibration-proof rubber 13 or the like) for the purpose of minimizing relative vibration with respect to.

As a conventional anti-vibration mechanism, for example, one disclosed in Japanese Patent Laid-Open No. 63-138588 is known. In this, the anti-vibration rubber comes into contact with each of the base, the mount frame and the anti-vibration rubber pressing plate, and the anti-vibration rubber pressing plate is fixed to the base with a screw so as to have an anti-vibration function. Further, in particular, the surface shape in which the anti-vibration rubber comes into contact with other members is also disclosed in detail.

Further, as a conventional vibration isolation mechanism, for example, one disclosed in Japanese Patent Laid-Open No. 64-46284 is known. This is to improve the vibration characteristics by deciding the hardness of each anti-vibration rubber so that the displacement of each anti-vibration rubber will be averaged when the anti-vibration rubber connecting the device via the frame receives external vibration. It is a thing.

[0010]

In the information recording / reproducing apparatus, it is determined that the specifications of the operating environment temperature range must cover the range of 5 to 45 ° C. during operation. However, even if the upper limit value of the operating environment temperature is 45 ° C., the continuous heating operation of the actuator causes the actuator to generate heat, and the temperature of the base portion rises. As a result, the temperature in the vicinity of the vibration isolator mounting portion may reach 60 ° C. When the vibration-proof rubber material is at a high temperature of about 60 ° C., the material softens and the spring constant decreases.

When the carriage on which the head is mounted is rotationally driven based on the positioning command, the entire apparatus supported by the vibration proof rubber is vibrated by the driving reaction force of the carriage to start minute rotational vibration. When the spring constant of the anti-vibration rubber decreases, the natural frequency in the rotation direction of the device supported by the anti-vibration rubber decreases, and the small rotational vibration amplitude of the device increases due to the inertial force of the device. As a result, the disk and carriage rotation support system are vibrated, the relative vibration between the head and the disk occurs, and the head positioning time is delayed due to the residual vibration of the head.

Further, the frequency of the exciting force in the rotation direction of the entire apparatus due to the reaction force of the carriage changes depending on the positioning distance of the carriage and the like. Since the natural frequency in the rotational direction of the device changes within a certain range due to the temperature change, it may resonate in accordance with the frequency of the exciting force, and the residual vibration may further delay the positioning time.

The above-mentioned two publications only consider the vibrational behavior under normal environmental temperature conditions, and it is not guaranteed whether stable positioning is performed even at high temperatures.

An object of the present invention is to provide an anti-vibration mechanism for an information recording / reproducing apparatus which has stable anti-vibration characteristics even if the temperature inside the apparatus rises due to heat generated by continuous high-speed driving of the actuator.

[0015]

In order to achieve the above object, the present invention provides a recording medium on which information is recorded, driving means for driving the recording medium, and recording of information on the recording medium. .In an information recording / reproducing apparatus having a reproducing head and a holding means for holding the head, the recording medium, the driving means and the holding means being attached to the base, when the base is attached to the customer's case A vibration damping member is provided between the base and the customer side casing, and a temperature compensating member is provided for keeping the spring constant of the vibration damping member constant even if the ambient environmental temperature changes.

According to the present invention, a recording medium for recording information, a driving means for driving the recording medium, a head for recording / reproducing information on / from the recording medium, and a head for holding the head are provided. In the information recording / reproducing apparatus in which the recording medium, the driving means, and the holding means are attached to the base, the recording medium, the driving means, and the holding means are provided between the base and the customer side casing when the base is attached to the customer side casing. In addition to providing a vibration isolating member, a temperature compensating member is provided which restrains the deformation of the vibration isolating member at a high temperature and releases the constraint at a low temperature.

Furthermore, the present invention is that any one of the above-mentioned vibration isolation mechanisms is mounted on a magnetic disk device or an optical disk device.

[0018]

[Function] As the ambient environmental temperature rises, the vibration isolator softens and the spring constant decreases, but the softening of the vibration compensating material of the temperature compensating member reduces the spring constant of the vibration isolator by compressively deforming. You can On the contrary, when the ambient environmental temperature decreases, the vibration isolating member hardens, but the temperature compensating member deforms in the opposite direction, and the amount of compressive deformation of the vibration isolating member decreases. In this way, the spring constant of the anti-vibration member can be maintained at a substantially constant value, and as a result, the vibration frequency and amplitude in the rotation direction of the entire device excited by the driving reaction force of the actuator can be made substantially constant, It is possible to obtain stable vibration damping characteristics even if the ambient temperature changes.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Before starting a specific description of the present invention, mechanical characteristics of the vibration-proof rubber material with respect to temperature will be described with reference to FIGS. 12 and 13. FIG. 12 shows the load-displacement characteristic of the rubber material. As shown by the curve at t = 60 ° C., the material softens and the amount of deformation per unit load increases as the temperature rises. When viewed as a spring constant, as shown in FIG.
In order to obtain the same spring constant k as that at the normal temperature of 20 ° C. even at a high temperature of 60 ° C., the rubber material may be forcibly changed by Δδ more than the change amount at the time of 20 ° C. That is, a constant spring constant can be maintained by continuously displacing the material in the direction indicated by the arrow in the figure in the temperature range of 20 ° C. to 60 ° C.

If the spring constant of the anti-vibration member can be kept constant even if the ambient environmental temperature changes, the vibration frequency and amplitude in the rotation direction of the entire apparatus excited by the driving reaction force of the actuator can be made almost constant. . In this way, since the natural frequency of the entire device in the rotational direction can be made constant, even if the frequency of the mechanical system excitation force due to the carriage drive reaction force changes due to the carriage positioning distance, etc., the range of change is known in advance. Therefore, it is possible to design a mechanical system that avoids resonance.

FIG. 1 shows the overall structure of an information recording / reproducing apparatus to which the vibration isolation mechanism of the present invention can be applied, and FIG. 2 is a side view (A) of FIG.
(View). The same parts as those of the conventional technique are designated by the same reference numerals, and detailed description thereof will be omitted.

A disc for recording information, a disc rotation drive device, a carriage for supporting the head and rotationally positioning the head in the radial direction of the disc, and a carriage drive device (not shown above) are provided on the base 2. . A cover 12 is provided on the upper surface side of the base 2, and a mount frame 15 is provided on the bottom surface side. The mount frame 15 is for connecting the entire magnetic disk device to the customer-side housing, and is attached to the bottom surface of the base 2 by the vibration-proof rubber 13 and the screw 14. The electric circuit board 22 is also attached to the bottom surface of the base 2 by the screws 14. Further, as shown in FIG. 2, a cushioning member 23 is provided between the mount frame 15 and the base 2.

Mount frame 15 and electric circuit board 22
To attach the to the base 2, first the electric circuit board 22 is pressed against the bottom surface of the base 2, and then the mount frame 1
One end of the anti-vibration rubber 13 pressed into 5 is pressed against the surface of the electric circuit board 16. In this state, the screw 14 is inserted from the other end of the anti-vibration rubber 13 and the screw 14 is coupled to the base 2 to mount the mount frame 15 and the electric circuit board 2 on each other.
Fix 2 to base 2.

Next, details of the temperature compensating member, which is a characteristic part of the present invention, will be described with reference to FIG. FIG. 3 shows the structure of the image stabilizing mechanism, and the same reference numerals as those in FIGS. 1 and 2 represent the same parts. The anti-vibration rubber 13 is press-fitted into the mount frame 15, and the anti-vibration rubber 1 is press-fitted.
3, the temperature compensating member 24a is press-fitted from above, and the temperature compensating member 24b is press-fitted from below. An electric circuit board 22 for controlling / calculating the device is sandwiched between the lower surface 2a of the base 2 and the upper surface 13a of the anti-vibration rubber 13, and the screw 14 inserted from the lower surface 13b of the anti-vibration rubber 13 is attached to the base 2 The mount frame 15 and the electric circuit board 22 are fixed to the base 2 by being coupled to. Although the electric circuit board 22 is attached to the vibration isolating mechanism for convenience here, the electric circuit board 22 may be attached directly to the base 2 by another method independently of the attachment of the vibration isolating mechanism.

The manner in which the temperature compensating member is deformed by the temperature will be described with reference to FIGS. Figure 4 shows the normal temperature (20
The state of the temperature compensating members 24a and 24b at (° C.) is shown in FIG. 7A and its sectional view is shown in FIG. Each of the temperature compensating members 24a and 24b has a shape in which a notch is formed in a conical portion, and at high temperature (60 ° C.), the portion opens to the outside to have a shape as shown in FIG. The temperature compensating members 24a and 24b reversibly deform with respect to temperature changes. That is, when the temperature drops, the state of FIG. 5 returns to the original state of FIG. As the material, a shape memory alloy (for example, Ti—Ni type shape memory alloy) or a thermostat metal having a bimetal effect can be used. When the thermostat metal is used, the shape of the temperature compensation member can be continuously deformed between low temperature and high temperature.

Next, how the above-mentioned temperature compensating member is deformed with respect to the temperature change when incorporated in the vibration-proof rubber will be described with reference to FIGS. 6 and 7. FIG. 6 shows the anti-vibration mechanism of the present invention described above at room temperature (20 ° C.).
FIG. With the temperature rise, the vibration-proof rubber 13 itself softens its material and its spring constant decreases. However,
The temperature compensating members 24a and 24b deform in the direction of the arrow in the figure as the environmental temperature rises, and compressively deform the vibration isolating material 13, so that the spring constant of the vibration isolating rubber 13 as described with reference to FIGS. 12 and 13. Can be maintained at a substantially constant value. FIG. 7 is a cross-sectional view of the vibration damping mechanism at a high temperature (60 ° C.), in which the temperature compensating members 24a and 24b having a conical shape open outward and are deformed, and the vibration damping material 13 is compressed and deformed.

If the temperature characteristic of the spring constant of the anti-vibration rubber 13 designed based on the anti-vibration specifications is obtained in the form shown in FIG. 13, the deformation amount corresponding to the temperature of the temperature compensating members 24a, 24b is set. However, it is possible to easily design an anti-vibration mechanism that performs temperature compensation.

FIG. 8 shows a flow of a method of manufacturing the temperature compensating members 24a and 24b. First, step 10
At 0, material is taken by press punching,
Next, in step 101, shape forming by deep drawing is performed. Then, in step 102, shape memory heat treatment is performed on the material after deep drawing.

In the above embodiment, two temperature compensating members are used, but the same effect can be obtained even with one.

FIG. 9 shows another embodiment of the present invention.
In the figure, the same parts as those in FIGS. 6 and 7 represent the same parts. In this embodiment, the temperature compensation members 24a, 2
4b is molded inside the anti-vibration rubber 25. Even with this structure, the temperature compensation member 24 is
The a and 24b can be deformed in the direction of the arrow in the figure to compressively deform the vibration-proof rubber 25. According to this embodiment, since the temperature compensating members 24a and 24b are formed integrally with the vibration isolating rubber 25, the assembly of the vibration isolating mechanism can be simplified.

FIG. 10 shows still another embodiment of the present invention. In the present embodiment, the temperature compensating member 26 is arranged in the immediate vicinity of the mount frame 15, and the entire temperature compensating member 26 is molded inside the anti-vibration rubber 27. The appearance of the temperature compensating member 26 at room temperature (20 ° C.) is as shown in FIG. 11A, and its cross section is as shown in FIG. 11B.

Although the magnetic disk devices have been described in the above embodiments, the present invention can be applied to optical disk devices and magnetic tape devices.

[0033]

As described above, according to the present invention,
Since the temperature compensating member reversibly deforms in shape in response to changes in the ambient environment temperature and compressively deforms a part of the vibration damping material, the spring constant of the vibration damping member can be maintained at a substantially constant value. Therefore, the vibration frequency and amplitude in the rotation direction of the entire device excited by the driving reaction force of the actuator can be made substantially constant, and stable vibration damping characteristics can be obtained even if the ambient environmental temperature of the vibration damping mechanism changes. Become. As a result, there is no delay in access time.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a magnetic disk device to which a vibration isolation mechanism of the present invention can be applied.

FIG. 2 is a side view of FIG.

FIG. 3 is a diagram showing a component configuration of a vibration isolation mechanism of the present invention.

FIG. 4 is a diagram showing a state of a temperature compensation member at room temperature.

FIG. 5 is a diagram showing a state of the temperature compensation member at a high temperature.

FIG. 6 is a cross-sectional view of the vibration damping mechanism of the present invention at room temperature.

FIG. 7 is a cross-sectional view of the vibration damping mechanism of the present invention at high temperature.

FIG. 8 is a flowchart showing a manufacturing procedure of the temperature compensation member.

FIG. 9 is a cross-sectional view of a vibration isolation mechanism according to another embodiment of the present invention at room temperature.

FIG. 10 is a sectional view of a vibration isolation mechanism according to still another embodiment of the present invention at room temperature.

11 is a diagram showing a state of the temperature compensation member of FIG. 10 at room temperature.

FIG. 12 is a load-displacement characteristic diagram of a rubber material.

FIG. 13 is a spring constant-displacement characteristic diagram of a rubber material.

FIG. 14 is a diagram showing an outline of a conventional magnetic disk device.

[Explanation of symbols]

 2 base 12 cover 13, 25, 27 anti-vibration rubber 14 screw 15 mount frame 22 electric circuit board 24a, 24b, 26 temperature compensation member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hirotake Hirai 502 Kintate-cho, Tsuchiura-shi, Ibaraki Prefecture Hiritsu Seisakusho Co., Ltd.

Claims (9)

[Claims] 1. A recording medium for recording information, a driving means for driving the recording medium, a head for recording / reproducing information on / from the recording medium, and a holding means for holding the head. In the information recording / reproducing apparatus having the recording medium, the driving means and the holding means attached to the base, a vibration damping member is provided between the base and the customer side casing when the base is attached to the customer side casing. An anti-vibration mechanism for an information recording / reproducing apparatus, which is provided with a temperature compensating member for making the spring constant of the anti-vibration member constant even if the ambient environment temperature changes. 2. A recording medium for recording information, a driving means for driving the recording medium, a head for recording / reproducing information on / from the recording medium, and a holding means for holding the head. In the information recording / reproducing apparatus having the recording medium, the driving means and the holding means attached to the base, a vibration damping member is provided between the base and the customer side casing when the base is attached to the customer side casing. An anti-vibration mechanism for an information recording / reproducing apparatus, which is provided with a temperature compensating member that restrains the deformation of the anti-vibration member at a high temperature and releases the constraint at a low temperature. 3. The vibration isolating mechanism according to claim 1, wherein the temperature compensating member is a shape memory alloy whose shape reversibly changes between high temperature and low temperature. Anti-vibration mechanism for playback device. 4. The vibration damping mechanism according to claim 1, wherein the temperature compensating member is a thermostat metal whose shape reversibly continuously changes between high temperature and low temperature. Anti-vibration mechanism for information recording / reproducing device. 5. The vibration isolation mechanism according to claim 2, wherein the high temperature is 60 ° C. and the low temperature is 20 ° C.
An anti-vibration mechanism for an information recording / reproducing apparatus, which is characterized in that the temperature is ℃. 6. The image stabilizing mechanism according to claim 1, wherein the temperature compensating member is detachable from the image stabilizing member. 7. The image stabilizing mechanism according to claim 1, wherein the temperature compensating member is molded inside the image stabilizing member. mechanism. 8. A magnetic disk device equipped with the anti-vibration mechanism according to claim 1. 9. An optical disk device equipped with the vibration isolation mechanism according to claim 1.