JP4349250B2 - Hard disk recording / playback device - Google Patents

Description

  The present invention relates to mounting of a hard disk drive in a hard disk recording / reproducing apparatus, and more particularly to a technique that reduces external impacts and vibrations while reducing cost and weight.

  In recent years, digital recorders using a hard disk as a recording medium tend to be increasingly used for consumer use and monitoring as the capacity increases. However, since the hard disk drive for operating the hard disk is a precision device, reliability including handling is regarded as important. For this reason, it is extremely important to select a buffer member for reducing shock and vibration transmitted to the hard disk drive by absorbing the shock and vibration against external shock and vibration.

As a prior art using such a buffer member, an elastic member is arranged between the hard disk drive unit and the main body case, and the screw flange portion and the main body are interposed via a metal cylindrical spacer penetrating the elastic member. The elastic member is fixed so as to be compressed by the case, and is elastically supported by the elastic force of the elastic member, so that external shock and vibration are not easily transmitted to the hard disk drive. (For example, see Patent Document 1)
In another prior art, an elastic member is disposed between the hard disk drive unit and the main body case, and a rigid metal or resin penetrating the elastic member made of a low hardness gel-like polymer compound including styrene gel is used. Screwed through a formed cylindrical spacer with a flange, and fixed so that the elastic member is compressed between the flange of the cylindrical spacer and the body case. It is hard to be transmitted to. (For example, see Patent Document 2)
JP 2001-34495 A JP 2000-133959 A

  In the prior art described in Patent Document 1, an elastic member such as a rubber bush is compressed and fixed by a metal main body case and a metal screw flange portion through a metal spacer, and is transmitted through the main body case and the screw. The impact and vibration from the outside are absorbed and reduced by elastic members. However, since the spacer, body case, and screw are made of metal, the elastic modulus is very high, about 210 GPa, and the fixed members are integrated into a rigid body. This part absorbs and attenuates external shocks and vibrations. There was a problem that there was no effect.

  Further, in the prior art described in Patent Document 2, the main body case and the cylindrical spacer are fixed by screwing them through a cylindrical spacer with a flange portion so that the elastic member is compressed between the flange portion of the cylindrical spacer and the main body case. The elastic member absorbs and reduces external shock and vibration transmitted through the screw. However, the body case and screws are rigid, and the cylindrical spacer with flange is also rigid and does not consider the elastic modulus, so there is a problem that this part has no effect of absorbing and attenuating external shocks and vibrations. there were.

  By the way, the hard disk recording / reproducing apparatus may accidentally drop the product during transportation. A large impact is applied to the apparatus and the hard disk drive when dropped, but it must be ensured that the cushioning member such as a spacer is not deformed or the hard disk drive is not detached from the main body case when dropped. Therefore, it is necessary that the above-mentioned flange portion of the screw and the flange portion of the spacer can withstand a large impact such as when dropped.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a hard disk recording / reproducing apparatus having a configuration in which a hard disk drive is fixed to a case by an elastic member, a spacer with a flange and a screw, and having a predetermined range of elastic modulus. Shock and vibration transmitted from the main body case due to vibration can be absorbed and reduced even at the case, spacer and screw, making it less susceptible to external shock and vibration and withstanding large shocks such as when dropped. It is to provide a hard disk recording / reproducing apparatus.

  In order to solve the above-described problems, the present invention provides a hard disk recording / reproducing apparatus having a configuration in which a hard disk drive is fixed to a case by an elastic member, a spacer with a flange portion, and a screw, and the spacer has an elastic modulus within a predetermined range. It is characterized by being formed of a resin having As a result, shock / vibration can be absorbed and reduced even at the case, spacer, and screw, making it less susceptible to external shock / vibration and being able to withstand large impacts such as when dropped. . Moreover, the weight of the apparatus can be reduced by using resin.

  Further, the spacer is formed of an amorphous polymer material resin containing butadiene rubber. Here, since the amorphous polymer material is stable with little change in elastic modulus behavior due to temperature change, it can be resistant to temperature change. Further, a resin of an amorphous polymer material containing butadiene rubber is generally used, and the cost can be reduced.

  Further, the spacer is formed of a resin having an elastic modulus in a range of about 2 to 3 Gpa. As a result, the elastic modulus of the material may be a general ABS (acrylonitrile butadiene styrene) material, and the cost can be further reduced.

  With the configuration as described above, in the hard disk recording / reproducing apparatus configured to fix the hard disk drive to the case with an elastic member, a spacer with a flange portion, and a screw, the spacer has a predetermined range of elasticity, and is externally provided. The shock / vibration transmitted from the main body case due to the shock / vibration of the case can be absorbed and reduced even at the case, spacer and screw parts, making it less susceptible to external shock / vibration and being able to withstand large shocks such as when dropped. Can also withstand.

  In addition, by using a resin member as the spacer, it is possible to reduce the weight and cost of the apparatus.

  An embodiment of a hard disk recording / reproducing apparatus according to the present invention will be described below with reference to FIGS.

  The configuration of the hard disk recording / reproducing apparatus according to the present embodiment will be described with reference to FIGS. FIG. 1 is an external perspective view of the inside of a hard disk recording / reproducing apparatus. In the bottom case 1 of this apparatus, a hard disk drive unit composed of a hard disk bracket 4 and a hard disk drive 5 is composed of a rubber bush 8 as an elastic member, a spacer 7 having flange portions on both sides, and a screw 9. It is fixed to the bottom case 1 at some points.

  Next, the configuration of the hard disk drive unit and the fixed frame will be described with reference to FIGS. FIG. 2 is an external perspective view of the hard disk drive unit attached to the fixed frame, and FIG. 3 is an external perspective view before the hard disk drive unit is attached to the fixed frame.

  The hard disk drive 5 is fixed to the hard disk bracket 4 with screws 6 at four locations. The hard disk bracket 4 is guided by the mounting guide portion 3a of the fixed frame 3 and positioned by the fixed portion 3b, and is fixed to the holes 3d and 3e of the fixed frame 3 by the screws 10 through the holes 4a and 4b of the hard disk bracket 4. .

  On the other hand, a rubber bush 8 in which a spacer 7 is previously fitted into the rubber bush 8 is inserted into each of the four holding portions 3 c of the fixed frame 3 and fixed to the bottom case 1 with screws 9.

  Next, the mounting configuration and assembly for holding the hard disk drive unit will be described in detail with reference to FIGS. FIG. 4 is a cross-sectional view of a configuration for holding the fixed frame 3, and FIG. 5 is a perspective view of members used in the configuration for holding the fixed frame 3.

  The spacer 7 is fitted into the rubber bush 8 so that the cut portion 8a of the rubber bush 8 is on top, and the cut portion 8a is inserted into the holding portion 3c of the fixed frame 3 for holding the hard disk drive unit. Thereafter, the through-hole portion of the spacer 7 is inserted into the support shaft 1 a planted in the bottom case 1, and the rubber cushion 8 comes into contact with the bottom case 1 so as to surround the support shaft 1 a and is fixed with screws 9. Here, the spacer 7 is formed of an amorphous polymer material resin (for example, ABS material) containing butadiene rubber having an elastic modulus of about 2 to 3 Gpa.

  With this mounting structure, a path through which shock and vibration from the outside of the apparatus are transmitted from the bottom case 1 to the support shaft 1a and the screw 9, and a path from the bottom case 1 to the holding unit 3c and the hard disk drive unit through the rubber bushing 8, There are paths through which the bottom case 1, the support shaft 1 a, the screw 9, the spacer 7, and the rubber bush 8 are communicated with the holding portion 3 c and the hard disk drive unit. Here, the impact / vibration from the bottom case 1 is attenuated / reduced by the rubber bush 8 as in the conventional case. Further, since the shock and vibration from the support shaft 1a and the screw 9 are absorbed and damped by the spacer 7 having a low elastic modulus according to the present invention and further damped and reduced by the rubber bush 8, the hard disk drive is provided via the holding portion 3c. Thus, it is possible to make a structure in which the shock and vibration transmitted to 5 are more difficult to be transmitted. Here, since the elastic modulus of the spacer 7 is about 2 to 3 Gpa, it is possible to prevent the spacer 7 from being deformed even when a large force is applied to the spacer 7 with a large impact even when the spacer 7 is dropped, or the holding portion 3c from being detached from the cut portion 8a. .

  Furthermore, since the spacer is made of resin, the apparatus can be reduced in weight and cost can be reduced.

  FIG. 6 and FIG. 7 show the impact reduction effect when the material of the spacer 7 is changed from a metal to an amorphous polymer resin (for example, ABS material) containing butadiene rubber having an elastic modulus of about 2 to 3 Gpa. Will be described. 6 and 7 show the impact value of the magnitude of the impact applied to the hard disk drive 5 when an external impact is applied, and FIG. 6 shows the impact value to the hard disk drive 5 by the conventional metal spacer. FIG. 7 shows the impact value to the hard disk drive 5 in the ABS spacer of the present invention. Here, a shock sensor was mounted on the hard disk drive 5, and the strength of the shock when one side of the apparatus was dropped from a predetermined height was measured by the output of the shock sensor.

  As shown by A in FIG. 6, in the case of a conventional metal spacer, the peak-to-peak value of the impact value is 7.7 mVP-P. In contrast, in the case of the ABS spacer according to the present invention, as shown in FIG. 7B, it is 4.5 mVP-P, which is reduced to about 58%.

  In this way, by using a spacer with a predetermined range of elastic modulus, the impact and vibration transmitted from the body case due to external impact and vibration can be absorbed and reduced even at the spacer and screw parts. It becomes difficult to be affected by the impact and vibration of the camera and can withstand a large impact such as when dropped.

  In this embodiment, the elastic modulus in a predetermined range is 2 to 3 GPa, and the resin material is an amorphous polymer material resin containing butadiene rubber (for example, ABS material). The material of the resin is not limited to this. The range of elastic modulus and the material of the resin, considering the force applied by a large impact at the time of dropping and the extent of attenuation will vary depending on the shape of the spacer 7 and the weight of the hard disk drive 5 etc. May be changed.

It is an external appearance perspective view inside a hard-disk recording / reproducing apparatus. FIG. 3 is an external perspective view of a state in which the hard disk drive unit is attached to a fixed frame. It is an external appearance perspective view before attaching a hard-disk drive unit to a fixed frame. It is sectional drawing of the structure for hold | maintaining a fixed frame. It is a perspective view of the member used for the structure for hold | maintaining a fixed frame. The impact value to the hard disk drive part by the conventional product. The impact value to the hard disk drive part by this invention is represented.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Bottom case, 1a ... Support shaft, 3 ... Fixed frame, 3a ... Mounting guide part, 3b ... Fixed part, 3c ... Holding part, 3d, 3e ... Hole 4, hard disk bracket, 4a, 4b ... hole, 5 ... hard disk drive, 6 ... screw, 7 ... spacer, 8 ... rubber bush, 8a ... notch , 9 ... Screw, 10 ... Screw

Claims (3)

In a hard disk recording / reproducing apparatus having a configuration in which a hard disk drive is fixed to a case using an elastic member, a flanged spacer, and a screw,
The spacer is formed of a resin having a predetermined range of elastic modulus ,
When the hard disk drive is fixed, it is fixed in the order of the screw, the spacer, the elastic member, and the case from the screw toward the case in the long axis direction of the screw.
The end surface of the case side of the flange portion abuts with the elastic member, the spacer hard disc recording and reproducing apparatus according to claim Rukoto is fixed to the case via the elastic member. The hard disk recording / reproducing apparatus according to claim 1,
2. The hard disk recording / reproducing apparatus according to claim 1, wherein the spacer is made of an amorphous polymer resin containing butadiene rubber. The hard disk recording / reproducing apparatus according to claim 1 or 2,
The hard disk recording / reproducing apparatus, wherein the spacer is formed of a resin having an elastic modulus in a range of 2 to 3 Gpa.

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