JP2001126462A - Vibration proof mechanism and portable information recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration proof mechanism and a portable information recording and reproducing device having the vibration proof mechanism that vibration proof characteristic necessary for portable equipment is fully applied to all vibrating directions, the structure extremely simple and assembly is easy. SOLUTION: In this vibration proof mechanism, floating part 3 is supported on a base part 9 in a floating state through gel member, and any vibration or impact from a base part 9 is absorbed and attenuated by the gel member, and transmitted to the floating part 3. In this case, the gel member is constituted as an almost spherical gel member 6, and the floating part 3 has a shape of an almost rectangular parallelepiped. Then, the almost spherical gel member 6 is mounted on each corner part of the floating member 3. Thus, any vibration or impact in all directions from the base part 9 can be absorbed and attenuated by almost the spherical gel member 6, and transmitted to the floating part 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable device, for example, by arranging a substantially spherical gel-like member at a corner of a floating portion and further incorporating the entire block without fixing it inside the housing. The present invention relates to an anti-vibration mechanism that satisfies the anti-vibration characteristics required for a portable device in all vibration directions, has a very simple structure, and is easy to assemble.

[0002]

2. Description of the Related Art Generally, in a portable device, in particular, an information recording / reproducing apparatus using a disk such as a CD, there is a problem of vibration and impact received by the device during use. As a countermeasure, conventional audio recording / reproducing devices such as CDs and MDs are provided with a buffer memory and store information in the memory so that even if the pickup becomes detached due to vibration or impact and the information cannot be read, the information is stored in the memory. This prevents the sound from being interrupted when the pickup returns during that time.

On the other hand, in the case of video information, since the amount of information is orders of magnitude larger than that of audio, an extremely large capacity of memory is required if all of the information can be covered by the memory, and this can be realized in terms of equipment size and cost. difficult.

For this reason, magnetic tapes have conventionally been mainly used as recording media for video. However, as non-linear editing is becoming mainstream in broadcast stations and the like, it is required that news material be photographed on a disc basis. Therefore, even in a portable disk device that records and reproduces video information, for example, a disc camcorder (trade name), stable recording and reproduction operations can be performed with respect to vibration and impact during use, and mobility and operability of the device. Therefore, a small vibration damping mechanism for realizing a portable size that does not impair the image quality is required.

On the other hand, in a stationary device, for example, as shown in FIG.
There is an example in which a mechanical deck 33 for performing recording and reproduction is floated from a housing 34 by using a spring 35, a rubber damper 36, or the like, so as to have an anti-vibration effect in a direction perpendicular to the installation surface of the device. FIG. 17 is a side sectional view of a portion where the mechanical deck 33 of FIG. As shown in FIGS. 16 and 17, mounting portions 33 a protrude substantially in the horizontal direction at the four corners of the mechanical deck 33. A bolt 38 is attached to the mounting portion 33a.
A screw hole 33a-1 for screwing with the screw portion is provided.

A substantially hemispherical rubber damper 36 is provided on the housing 34.
Is fixed by a pair of screws 41. A hole is formed at the top of the substantially hemispherical rubber damper 36 fitted into the hole at the center of the metal frame 40, and a female screw member 42 is fitted into this hole. The screw portion of the bolt 38 is screwed into the screw hole 33a-1 of the mounting portion 33a and the female screw member 42, and the spring 35 is compressed against the elastic force. That is, the mechanical deck 33 is attached to the housing 34 via the spring 35 and the rubber damper 36, and has a vertical vibration damping effect.

On the other hand, in portable devices, it is assumed that vibrations and shocks are applied to the devices from all directions, and accordingly, a vibration damping mechanism is required. Therefore, a vibration damping mechanism using a spring and a rubber damper as shown in FIG. 18 has been devised. FIG. 18 shows a portable disk device in which a mechanical deck 47 on which an optical pickup 45 for recording and reproduction is mounted is opposed to a disk 48 so that recording and reproduction can be simultaneously performed on both surfaces of the disk 48. The floating portion 49 including the two mechanical decks 47 has eight identical tension coil springs 5 with respect to the base portion 50.
They are connected by two. Each tension coil spring 52 is floated in a state of being pulled from its free length, that is, in a state where the floating portion 49 is pulled by each coil spring 52. Further, a damper shaft 54 provided in the floating portion 49 is inserted into the damper 53 fixed to the base portion 50, so that a predetermined vibration-proof performance can be obtained by the coil spring 52 and the damper 53. As shown in FIG.
By pulling the coil spring 52 three-dimensionally, vibration resistance can be provided in any direction.

[0008]

However, FIG.
In the structure shown in (1), the coil spring 52 must be hung on the hole while being pulled at the time of assembling, and when the number is large, it is extremely troublesome and troublesome. Further, the work of inserting the damper shaft 54 into the damper 53 is also required, and the workability is extremely poor. Also, a coil spring 52,
In addition to the damper 53, a damper shaft 54, a metal plate for hanging a spring, a holding plate for the damper, and the like are required, and there is a problem in that the number of parts increases.

As a countermeasure against such a problem, there is a conventional vibration damping mechanism using a gel-like material in which a substantially cylindrical gel 56 as shown in FIG. I do. However, in the vibration isolating mechanism of this example, although a predetermined characteristic is obtained in the compression direction, the strength in the shear direction is weak and the resonance frequency is too low, so that the portable device that requires vibration isolation in all directions is required. Not suitable for Therefore, there is a method in which a substantially cylindrical gel 56 is arranged in all directions as shown in FIG. According to this method, it is possible to satisfy predetermined characteristics in all directions, but it is difficult to realize the characteristics due to space, assemblability, and the like.

By the way, the following characteristics are required for a vibration isolating mechanism of a portable device. FIG. 21 is a model when a floating portion 62 having a mass m is supported by using a spring 60 and a damper 61 having a spring constant k. FIG. 22 shows FIG.
FIG. 23 shows the vibration transmission characteristics of the anti-vibration mechanism model shown in FIG. 21, and FIG.
4 shows a spectrum distribution of the vibration isolation mechanism model shown in FIG. The vibration applied to the base portion 63 as the fixed portion shown in FIG. 21 is transmitted to the floating portion 62 with a vibration transmission characteristic as shown by a solid line in FIG. At this time,
As shown in FIG. 23, the anti-vibration characteristics of recording / reproducing by a recording / reproducing unit (not shown) mounted on the floating unit 62 decrease near the resonance frequency fo of the vibration system. The larger, the larger.

Now, it is assumed that when a vibration applied to a device for which vibration is to be prevented is measured, a spectrum distribution as shown in FIG. 24 is obtained. The low range appears in normal use, and the high range appears when impact is applied. In order to provide an anti-vibration effect to a low frequency range, the resonance frequency may be lowered as shown by the transfer characteristic shown by the broken line in FIG.
Must be made very small, which is difficult to realize.
Therefore, it is necessary to raise the resonance frequency to some extent. However, if the resonance frequency is near the low frequency spectrum shown in FIG. 24, the vibration resistance during normal use is deteriorated. When the resonance frequency is further increased, there is a problem that attenuation in a high frequency band is deteriorated and the shock is weakened. Therefore, an appropriate resonance frequency fo and resonance magnification Q must be realized in all directions.

Therefore, the present invention provides a vibration-damping mechanism which satisfies the vibration-damping characteristics required for a portable device in all vibration directions, has a very simple structure and is easy to assemble, and a portable type having this vibration-damping mechanism. It is an object of the present invention to provide an information recording / reproducing device.

[0013]

According to the vibration isolating mechanism of the present invention, a floating portion is supported on a base portion via a gel member in a floating state, and vibrations and shocks from the base portion are absorbed and attenuated by the gel member. In the vibration isolating mechanism for transmitting to the floating portion, the gel member is a substantially spherical gel member, and the floating portion has a substantially rectangular parallelepiped shape,
The substantially spherical gel members are attached to respective corners of the floating portion, and vibrations and shocks from all directions from the base portion are absorbed and attenuated by the substantially spherical gel members and transmitted to the floating portion. It is assumed that.

A portable information recording / reproducing apparatus according to the present invention comprises:
A portable information recording / reproducing device having a vibration isolating mechanism for supporting a floating portion in a floating state on a base portion via a gel member, absorbing vibrations and shocks from the base portion by the gel member, attenuating the vibrations and shocks, and transmitting the damped vibrations and shocks to the floating portion. In the device,
The gel member is a substantially spherical gel member, the floating portion has a substantially rectangular parallelepiped shape, and the substantially spherical gel member is attached to each corner of the floating portion, and vibrations and impacts in all directions from the base portion are provided. Is absorbed by the substantially spherical gel member, attenuated, and transmitted to the floating portion.

Further, in the vibration damping mechanism according to the present invention, the floating portion is supported on the base portion in a floating state via a gel member, and vibrations and shocks from the base portion are absorbed and attenuated by the gel member to attenuate the floating portion. In the vibration isolating mechanism, the floating portion is provided with a plurality of protrusions, and a vertical direction, a horizontal direction,
The gel member is disposed in three directions of front and rear directions, and a surface of the gel member opposite to the protrusion is attached to a plate fixed to the base portion, and the gel members disposed in the three directions vibrate. , So that vibrations and shocks in all directions from the base portion are absorbed and attenuated by the gel member and transmitted to the floating portion.

A portable information recording / reproducing apparatus according to the present invention comprises:
A portable information recording / reproducing device having a vibration isolating mechanism for supporting a floating portion in a floating state on a base portion via a gel member, absorbing vibrations and shocks from the base portion by the gel member, attenuating the vibrations and shocks, and transmitting the damped vibrations and shocks to the floating portion. In the device,
A plurality of projections are provided on the floating portion, and three projections perpendicular to the projections, that is, up, down, left,
The gel member is disposed in the three directions, and the surface of the gel member opposite to the projection is attached to a plate fixed to the base, and the gel members disposed in the three directions are compressed against vibration. The gel member absorbs and attenuates vibrations and shocks in all directions from the base portion and attenuates and transmits the vibrations and shocks to the floating portion.

In the vibration isolating mechanism according to the present invention, substantially spherical gel members are attached to the respective corners of the floating portion, so that vibrations and shocks in all directions from the base portion are absorbed and attenuated by the substantially spherical gel members. And transmitted to the floating part. As a result, a vibration proof mechanism that satisfies the vibration proof characteristics required for portable equipment in all vibration directions, has a very simple structure and is easy to assemble, and realizes a portable information recording / reproducing device having this vibration proof mechanism. it can.

Further, in the vibration damping mechanism according to the present invention, a plurality of projections are provided on the floating portion, and the gel members are arranged in three directions perpendicular to the projections, that is, up and down, left and right, and front and back. Vibrations and shocks in all directions from the part are transmitted to the gel member via the plate, absorbed and attenuated by the gel member, and transmitted to the floating part. As a result, a vibration proof mechanism that satisfies the vibration proof characteristics required for portable equipment in all vibration directions, has a very simple structure and is easy to assemble, and realizes a portable information recording / reproducing device having this vibration proof mechanism. it can.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an example of an embodiment of a vibration isolating mechanism according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an anti-vibration mechanism of the present invention. For example, a substantially spherical gel member 6 is attached to each of the eight corners of the rectangular parallelepiped floating portion 3 of the portable information recording / reproducing apparatus via the mounting metal plate 5.
Is arranged. Mounting metal plate 5 and substantially spherical gel member 6
, A vibration isolating member 4 is formed. A pair of mechanical decks 7 are provided in the rectangular parallelepiped floating portion 3 with a disc (not shown) interposed therebetween.

According to the present invention, a substantially spherical gel member is used as a vibration-proof member, so that it is easy to assemble with a simple structure and to improve vibration-proof and shock-proof performance in all directions. is there.

2A and 2B show the vibration isolating member 4, wherein FIG. 2A is a perspective view, FIG. 2B is a side view, and FIG. 2C is a side sectional view. As shown in the figure, the mounting sheet metal 5 has a pyramid shape by welding the ridges, and has a volume of about 8
The structure occupies one part. That is, the substantially spherical gel member 6 has a cutout of about one eighth of the volume, and the mounting plate 5 is bonded to the cutout portion, for example. The mounting metal plate 5 and the substantially spherical gel member 6 are adhered and integrated at the time of molding the gel, and the vibration isolating member 4 is formed. A hole 5a for a screw is formed on each surface of the mounting sheet metal 5, and through this hole 5a, the mounting sheet metal 5
Are fixed to the respective corners of the floating portion 3 by screws 8.

As the substantially spherical gel member 6, for example, a silicone gel is used. The silicone gel has characteristics that the resonance point and the resonance magnification are lower and the vibration decay time is shorter than that of a high-performance anti-vibration rubber. Also, it has excellent temperature characteristics and durability. The main physical properties of the silicone gel used in the present invention are a specific gravity of 1.02, a hardness (penetration) of 55, a tensile strength of 7.6 kgf / cm ² , and a Young's modulus of 0.858 kgf / c.
m ² , elongation 718%, normal temperature range -50 ~ 200 ° C
It is.

FIG. 3 is a perspective view showing the incorporation of the floating portion 3 in which the vibration isolating member 4 is attached to eight corners into the housing 9. The housing 9 serving as a base is a box having one open side. Vibration isolating members 4 are attached to the eight corners of the floating portion 3, respectively. The floating portion 3 to which the vibration isolating members 4 are attached is inserted into the housing 9 from an open surface. Three screw holes 9a are screwed into four corners of the open surface of the housing 9, respectively.
At the four corners of the open surface of the housing 9, a substantially triangular stopper 10 for retaining the floating portion 3 is screwed by a bolt 12.

That is, a hole 10 a for a bolt is formed in each corner of the substantially triangular stopper 10, a bolt 12 is inserted into the hole 10 a, and a tip thereof is screwed into a screw hole 9 a of the housing 9. The stopper 10 is attached to the housing 9
It is designed to be fixed to the four corners of the open surface of the. Therefore, the floating portion 3 to which the vibration isolating member 4 is attached can be incorporated into the housing 9 without being fixed to the housing 9 by the four stoppers 10. that time,
The lower gel member 6 is deformed by its own weight, but in this state, there is no gap in each direction due to the housing 9 and the stopper 10.

FIG. 4 is a side sectional view showing a state in which the floating portion 3 in which the vibration isolating member 4 is attached to eight corners is incorporated in the housing 9, and FIG. It is a figure, and a part of one stopper 10 is cut away. In FIG. 4, the gel member 6 on the stopper 10 side (lower side in the figure) is a gel member 6A, and the gel member 6 on the opposite side (upper side in the figure) to the stopper 10 is a gel member 6B. Since the gel member 6 of the vibration isolating member 4 is substantially spherical, escape of deformation when compressed is secured, and a state corresponding to an increase in the spring constant can be avoided. Can be prevented from becoming unnecessarily high.

Since the gel member 6A is not fixed to the housing 9, the gel member 6B on the side opposite to the gel member 6A on the side receiving compression.
Is not pulled and does not restrain the floating portion 3, so that the resonance frequency can be prevented from increasing.

Next, the characteristics realized by the anti-vibration mechanism according to the present invention will be described. FIG. 6 shows measured values of vibration applied to a portable device to which the vibration isolating mechanism according to the present invention is applied during normal use such as walking and running. The spectrum is concentrated below 10 Hz, and the component at 3 to 4 Hz is the largest.
Although not shown in FIG. 6, when an impact is applied, a spectrum appears in a region of 100 Hz or more.

FIG. 7 is a diagram showing the vibration transmission characteristics of the vibration isolating mechanism according to the present invention. The upper part shows amplitude characteristics, and the lower part shows phase characteristics. Each parameter will be described with reference to FIG. The resonance frequency fo at which the amplitude characteristic shows a peak is set to 10 to 20 Hz in order to avoid the low-frequency vibration spectrum during normal use shown in FIG. 6 and to provide vibration resistance from the lowest possible frequency. The peak height (resonance magnification) Q is set to 7 dB or less in order to minimize a decrease in vibration resistance near the resonance point. Further, the attenuation at 100 Hz is -20d.
By setting it larger than B, stability against impact can be secured.

Therefore, in the present invention, the natural frequency of the vibration-proof mechanism is set to a frequency slightly higher than the low-frequency spectrum shown in FIG. 6 and at a low frequency that does not impair the attenuation in the high frequency. In the low frequency range, the influence of vibration can be reduced by sufficiently setting the gains of various servos required for recording and reproduction. By setting the characteristics of the vibration system as described above, it is possible to realize a vibration-proof mechanism that can be practically used against vibration and impact from all directions during use.

Further, since the gel member is substantially spherical, escape of deformation when compressed can be ensured, a state corresponding to an increase in spring constant can be avoided, and a resonance frequency of the system is required. It can be prevented from becoming too high.

Furthermore, since the gel member is not fixed to the housing, the gel member in the direction opposite to the direction under compression is not in a tension state and does not restrain the floating portion, so that the resonance frequency is high. Can be prevented.

Next, an anti-vibration mechanism according to a second embodiment will be described. FIG. 8 is a perspective view showing a vibration isolating mechanism according to the second embodiment. A mechanical deck 17 using a disk is provided inside, for example, a rectangular floating section 16 of the portable information recording / reproducing apparatus. Floating part 16
Is provided with a plurality of projections, here two projections 18 on each of the left and right sides, for a total of four projections 18. A block-like gel member 19 is arranged in three directions, that is, a vertical direction, a left-right direction, and a front-rear direction, which are orthogonal to the respective projecting portions 18, and the projecting portions 18 are configured to be surrounded by the gel member 19.
That is, the gel members 19A and 19B in the X direction (vertical direction), the gel member 19C in the Y direction (left and right direction), and the gel members 19D and 19D in the Z direction (front and rear direction) with respect to the projection 18.
Has been arranged.

In FIG. 8, it is assumed that the X direction is the direction of gravity, and vibrations in each direction are applied while maintaining this posture. The gel member 19B on the lower side in the vertical direction has its volume lowered compared to the other gel members 19A, 19C, 19D, and 19D because the floating portion 16 sinks due to its own weight and is vibrated in a state where compression is applied in an initial state. It is getting bigger. The upper gel member 19A in the X direction is in a state where neither the tension nor the compression is applied at the position where the floating portion 16 sinks under its own weight. The gel members 19C, 19D, and 19D in the Y direction and the Z direction are set so as to be kept horizontal at the position where the floating portion 16 sinks.

As the gel member, for example, a silicone gel is used. The silicone gel has characteristics that the resonance point and the resonance magnification are lower and the vibration damping time is shorter than that of a high-performance anti-vibration rubber. Also, it has excellent temperature characteristics and durability. The main physical property values of the silicone gel used as the gel member of the second embodiment are a specific gravity of 1.02, a hardness (penetration) of 100, a tensile strength of 1.6 kgf / cm ² , and a Young's modulus of 0. .306 kgf / cm ² , elongation at 364%, and ordinary temperature range of −50 to 200 ° C.

Further, a U-shaped sheet metal 21 whose lower side is opened in a front view so as to cover the gel members 19A, 19D, 19D.
Is provided, and a U-shaped sheet metal 22 having an upper side opened in front view is provided so as to cover the gel member 19B.
A sheet metal 23 having a rectangular shape as viewed from the front is provided on the rear end surface of 9C. The sheet metal members 21, 22, and 23, which are plate members, are arranged at predetermined intervals. The gel members 19A, 19B, 19C,
Those provided with sheet metals 21, 22, 23 outside 19D, 19D are integrally formed as one unit 25.
Projecting portion 18, gel member 19, and sheet metal 21, 22, 23
Are adhered during molding.

FIG. 9 shows the unit 25.
(A) is a plan sectional view, (b) is a side sectional view, and (c) is a front sectional view. Screw holes 21a on the left and right of the rear end of sheet metal 21
Is provided, and a bent portion 22b in which a screw hole 22a is screwed is provided also on the right and left rear ends of the sheet metal 22. A pair of right and left screw holes 23a is also screwed into the sheet metal 23.

FIGS. 10A and 10B are views showing a state in which the unit 25 is mounted on the housing 27. FIG. 10A is a plan sectional view, and FIG.
Is a side sectional view, and (c) is a front sectional view. A housing 27 is provided in the screw hole 21a of the sheet metal 21 and the screw hole 22a of the sheet metal 22.
A screw 28 is screwed from the side, and a screw 29 is screwed into the screw hole 23a of the sheet metal 23 from the housing 27 side. in this way,
By fixing the sheet metals 21, 22, 23 to the housing 27, the floating portion 16 becomes the gel members 19A, 19B, 19
C, 19D, 19D and the metal plates 21, 22, 23 are in a state of being supported by compression in any direction, so that vibrations and shocks applied to the housing can be absorbed and reduced, and predetermined vibration isolation characteristics can be obtained. .

As shown in FIG. 11, when the gel members surrounding the projections 18 are integrated to fill the gap, this corresponds to a state where there is no escape for deformation and the spring constant is increased.
For this reason, the resonance frequency of the vibration system increases, and it becomes impossible to obtain predetermined characteristics. Therefore, it is necessary to divide the gel member surrounding the projection 18 in each direction.

The area of the projection 18 in contact with the gel member 19 is larger than that of the gel member 19. This is to prevent the gel member 19 from being damaged when a large impact is applied. FIG. 12 is a diagram illustrating a case where the gel member is damaged in the Y direction. As shown in FIG. 12, the gel member 30 largely compressed by the impact
Goes around the protrusion 31, and the protrusion 31 breaks through the gel member 30. On the other hand, if the area of the protrusion 32 is made larger than the gel member 30 to some extent as shown in FIG. 13, the gel member 30 is hardly damaged by an impact.

Next, characteristics realized by the anti-vibration mechanism of the second embodiment will be described. FIG. 14 shows measured values of vibration applied to a portable device to which the vibration damping mechanism of the second embodiment is applied during normal use such as walking or running. 10
The spectrum is concentrated below Hz, and the component of 3 to 4 Hz is the largest. Although not shown in FIG. 14,
When an impact is applied, a spectrum appears in a region of 100 Hz or more.

FIG. 15 is a diagram showing a vibration transmission characteristic of the vibration isolating mechanism according to the second embodiment. The upper part shows amplitude characteristics, and the lower part shows phase characteristics. Each parameter will be described with reference to FIG. The resonance frequency fo at which the amplitude characteristic shows a peak is shown in FIG.
In order to avoid the low frequency vibration spectrum during normal use shown in, and to provide vibration resistance from the lowest possible frequency,
It is set to 20 Hz. The peak height (resonance magnification) Q is set to 6 dB or less in order to minimize a decrease in vibration resistance near the resonance point. Further, by setting the attenuation at 100 Hz to be larger than -20 dB, it is possible to secure stability against impact.

Therefore, in the present invention, the natural frequency of the vibration-proof mechanism is set to a frequency slightly higher than the low-frequency spectrum shown in FIG. 14 and at a low frequency that does not impair the attenuation in the high frequency. In the low frequency range, the influence of vibration can be reduced by sufficiently setting the gains of various servos required for recording and reproduction. By setting the characteristics of the vibration system as described above, it is possible to realize a vibration-proof mechanism that can be practically used against vibration and impact from all directions during use.

In any direction, the gel member is used by compression, and its resonance frequency can be set to a frequency slightly higher than the low-frequency spectrum at the time of normal use and lower than the high-frequency spectrum at the time of impact. A vibration-proof mechanism that can be practically used for vibration and impact during normal use can be configured. Further, a simpler and more easily assembling mechanism can be configured as compared with the conventional vibration isolating mechanism.

In the second embodiment, the protrusions 18 are provided on the left and right surfaces of the floating portion 16. However, the present invention is not limited to this, and the protrusions 18 may be provided on the upper and lower surfaces of the floating portion 16. In that case, each gel member may be formed in a shape suitable for it.

In the above-described first and second embodiments, the anti-vibration mechanism is applied to a portable information recording / reproducing apparatus using a disk. However, the present invention is not limited to this. Of course, the present invention may be applied to an apparatus.

[0046]

As described above, according to the present invention,
A substantially spherical gel member is attached to each corner of the floating part, and vibrations and shocks in all directions from the base part are absorbed and attenuated by the substantially spherical gel member and transmitted to the floating part. It is possible to realize a vibration-proof mechanism that satisfies necessary vibration-proof characteristics in all vibration directions, has a very simple structure and is easy to assemble, and a portable information recording / reproducing apparatus having the vibration-proof mechanism.

Since the natural frequency of the vibration system formed by the substantially spherical gel member is set to be higher than the low-frequency vibration spectrum applied to the base portion during normal use and lower than the high-frequency vibration spectrum at the time of impact. In addition, it is possible to realize an anti-vibration mechanism that can be practically used against vibrations and impacts from all directions during use.

Further, a plurality of projections are provided on the floating portion, and gel members are arranged in three directions perpendicular to the projections, that is, in the vertical direction, the horizontal direction, and the front-rear direction. The impact is transmitted to the gel member via the plate, absorbed and attenuated by the gel member, and transmitted to the floating portion, so that the vibration-proof characteristics required for the portable device are satisfied in all vibration directions, and the structure is improved. A simple anti-vibration mechanism with good assemblability and a portable information recording / reproducing apparatus having this anti-vibration mechanism can be realized.

A plurality of protrusions are provided on the floating portion,
The natural frequency of the vibration system in which the gel member is arranged in three directions of the vertical direction, the left-right direction, and the front-rear direction orthogonal to the projection is higher than the low-frequency vibration spectrum applied to the base during normal use, Since the frequency is set to be lower than the high frequency vibration spectrum at the time of impact, it is possible to realize a practical vibration damping mechanism against vibration and impact from all directions during use.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an anti-vibration mechanism according to the present invention.

FIG. 2 is a view showing a vibration isolating member using a substantially spherical gel member according to the present invention.

FIG. 3 is a perspective view showing the incorporation into a housing of a floating unit in which vibration isolating members are attached to eight corners.

FIG. 4 is a side sectional view showing a state in which a floating unit to which a vibration isolating member is attached is incorporated into a housing.

FIG. 5 is a diagram of a housing in which a floating portion to which a vibration isolating member is attached is incorporated, as viewed from a stopper side.

FIG. 6 is a diagram showing actually measured values of vibration applied to a portable device to which the vibration damping mechanism according to the present invention is applied during normal use.

FIG. 7 is a diagram showing a vibration transmission characteristic of the vibration isolating mechanism according to the present invention.

FIG. 8 is a perspective view illustrating a vibration isolation mechanism according to a second embodiment.

FIG. 9 is a diagram showing a unit using a gel member.

FIG. 10 is a diagram showing a state where the unit is attached to a housing.

FIG. 11 is a view showing a case where fo becomes high due to integration of a gel member.

FIG. 12 is a diagram illustrating a case where a gel member is damaged.

FIG. 13 is a view showing a case in which the area of the surface of the protrusion contacting the gel member is larger than that of the gel member.

FIG. 14 is a diagram illustrating actually measured values of vibration applied to a portable device to which the vibration damping mechanism according to the second embodiment is applied during normal use.

FIG. 15 is a diagram illustrating a vibration transmission characteristic of the vibration isolating mechanism according to the second embodiment.

FIG. 16 is an exploded perspective view showing an anti-vibration mechanism of a stationary device.

17 is a side sectional view of a portion where the mechanical deck shown in FIG. 16 is attached to a housing.

FIG. 18 is a view showing a vibration isolating mechanism of a conventional portable disk device.

FIG. 19 is a view showing a vibration isolating mechanism in which a substantially cylindrical gel is vertically arranged.

FIG. 20 is a view showing a vibration isolating mechanism in which a substantially cylindrical gel is arranged in all directions.

FIG. 21 is a diagram illustrating a vibration isolation mechanism model that supports a floating portion using a spring and a damper.

FIG. 22 is a diagram illustrating a vibration transmission characteristic of a vibration isolation mechanism model.

FIG. 23 is a diagram illustrating vibration resistance characteristics of the vibration-proof mechanism model.

FIG. 24 is a diagram showing a spectrum distribution of a vibration isolation mechanism model.

[Explanation of symbols]

3 ... Floating part, 4 ... Vibration isolation member, 5 ...
・ Mounting sheet metal, 6 ... A substantially spherical gel member, 7 ...
Mechanical deck, 9: Housing (base portion), 10: Stopper, 16: Floating portion, 17: Mechanical deck, 18: Projecting portion, 19A, 19B, 19C,
19D: Block-shaped gel member, 21, 22, 23
... Sheet metal (plate), 25 ... Unit

Continued on the front page (72) Inventor Naoki Inoue 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (72) Inventor Shigeaki Koike 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Stock In company

Claims (9)

[Claims] An anti-vibration mechanism for supporting a floating portion in a floating state on a base portion via a gel member, absorbing and attenuating vibrations and shocks from the base portion with the gel member, and transmitting the damped vibration and shock to the floating portion. The gel member is a substantially spherical gel member, the floating portion has a substantially rectangular parallelepiped shape, and the substantially spherical gel member is attached to each corner of the floating portion, and vibrations and impacts in all directions from the base portion are provided. Is absorbed by the substantially spherical gel member, attenuated, and transmitted to the floating portion. 2. A frequency of a natural frequency of a vibration system formed by the substantially spherical gel member is higher than a low-frequency vibration spectrum applied to the base portion during normal use, and lower than a high-frequency vibration spectrum at the time of impact. The anti-vibration mechanism according to claim 1, wherein: 3. The anti-vibration mechanism according to claim 1, wherein the base portion is a housing, and the floating portion to which the substantially spherical gel member is attached is incorporated without being fixed inside the housing. . 4. A vibration isolating mechanism for supporting the floating portion in a floating state on a base portion via a gel member, absorbing vibrations and shocks from the base portion with the gel member, attenuating the vibrations and transmitting the shock and vibration to the floating portion. In the portable information recording / reproducing apparatus, the gel member is a substantially spherical gel member, the floating portion has a substantially rectangular parallelepiped shape, and the substantially spherical gel member is attached to each corner of the floating portion, and the base portion A portable information recording / reproducing apparatus, comprising: a vibration-proof mechanism for absorbing and attenuating vibrations and shocks in all directions from the gel member by the substantially spherical gel member and transmitting the damped and transmitted to the floating portion. 5. A vibration isolation mechanism for supporting a floating portion in a floating state on a base portion via a gel member, absorbing and attenuating vibrations and shocks from the base portion with the gel member, and transmitting the vibration and shock to the floating portion. A plurality of projections are provided on the floating portion, and three projections perpendicular to the projections, that is, up, down, left,
The gel member is disposed in the three directions, and the surface of the gel member opposite to the projection is attached to a plate fixed to the base, and the gel members disposed in the three directions are compressed against vibration. A vibration-absorbing mechanism wherein the gel member absorbs and attenuates vibrations and shocks in all directions from the base portion, and transmits the vibrations and shocks to the floating portion. 6. The natural frequency of a vibration system formed by the gel member is set to a frequency higher than a low-frequency vibration spectrum applied to the base portion during normal use and lower than a high-frequency vibration spectrum at the time of impact. 6. The method according to claim 5, wherein
4. The vibration isolating mechanism according to 1. 7. The anti-vibration mechanism according to claim 5, wherein the gel member is divided in three directions to prevent an increase in spring constant. 8. The anti-vibration mechanism according to claim 5, wherein an area of a surface of the projection that contacts the gel member is larger than an area of the gel member that contacts the gel member. 9. A vibration isolation mechanism for supporting the floating portion in a floating state on a base portion via a gel member, absorbing vibrations and shocks from the base portion with the gel member, attenuating the vibrations and transmitting the shock and vibration to the floating portion. In the portable information recording / reproducing apparatus, a plurality of projections are provided on the floating portion, and three projections perpendicular to the projections, namely, a vertical direction, a horizontal direction, and a front-rear direction.
The gel member is disposed in the three directions, and the surface of the gel member opposite to the projection is attached to a plate fixed to the base, and the gel members disposed in the three directions are compressed against vibration. A portable information recording / reproducing apparatus, characterized in that the portable information recording / reproducing apparatus is provided with a vibration damping mechanism for causing the gel member to absorb and attenuate vibrations and shocks in all directions from the base section and transmitting the vibrations and shocks to the floating section. .