JP4333665B2 - Support structure for electronic components - Google Patents

Description

  The present invention relates to an electronic component supporting structure that is provided in an electronic device including an electronic component and a heat radiating member that dissipates heat generated from the electronic component, and that supports the electronic component and cushions an impact applied to the electronic component from the outside. .

  A hard disk drive (hereinafter referred to as HDD) that records and reproduces data using a hard disk includes a personal computer (hereinafter referred to as PC), an HDD video recorder that records and reproduces video, and an HDD that reproduces music. In recent years, it has been widely used in audio players and the like.

  In recent years, many in-vehicle devices used in automobiles equipped with HDDs have been proposed. In-vehicle devices equipped with HDDs include HDD video recorders that reproduce video, car navigation devices that store map data, OS, etc. in HDDs, and drive recorders that record driving conditions and leave a history of traffic accidents, etc. Etc. are known.

  In such in-vehicle devices and notebook PCs equipped with HDDs, a support structure for protecting the HDD and the like from impacts such as automobile vibrations, vibrations caused by carrying by the user, and impacts such as dropping is indispensable. ing.

  By the way, since heat generated during the operation of the HDD may adversely affect the HDD itself, it is desirable to dissipate the generated heat to the outside. However, since the shock absorbing member used in the conventional support structure has low thermal conductivity, the heat generated from the portion supported by the shock absorbing member cannot be dissipated to the outside of the housing. There was a problem of inviting a temperature rise.

  In order to solve such a problem, as shown in FIG. 8, an electronic component such as an HDD is supported by an elastic shock absorbing member such as an elastomer or a sponge-like porous polyurethane foam. Separately, heat conduction is achieved by bringing one end of a heat conductive member such as a copper film having good heat conductivity into close contact with an electronic component and bringing the other end of the heat conductive member into close contact with a heat sink or the like. Has been proposed (see Patent Document 1).

  That is, in FIG. 8, 101 is an information processing apparatus, 102 is an electronic component such as an HDD, 103 is a heat conductive member, 104 is an impact absorbing member, 105 is a low heat generating surface, and 106 is a housing. The electronic component 102 is supported by the housing 106 via an impact absorbing member 104, and the impact absorbing member 104 absorbs external impact. Also, one end of a heat conductive member 103 such as a copper film is attached to the surface of the electronic component 102, and the other end of the heat conductive member 103 is attached to a heat dissipation member (not shown). ing.

The heat of the electronic component 102 is transferred to the heat radiating member by the heat conductive member 103 and is radiated from the heat radiating member to the outside air. Further, a region of the electronic component 102 where the heat conductive member 103 is not attached is made a low heat generation surface 105 by surface treatment, and heat conduction due to radiation of heat to unnecessary portions is prevented.
Japanese Patent Laid-Open No. 2005-4440

  However, since the thing of the said patent document 1 requires two members, the impact-absorbing member 104 and the heat conductive member 103, there exists a problem that a manufacturing cost will increase and an assembly will also require an effort.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an electronic device including an electronic component and a heat radiating member that radiates heat generated from the electronic component. It is an object of the present invention to provide an electronic component support structure for buffering an impact applied to an electronic component, which can reduce the number of electronic devices and the manufacturing cost.

In order to achieve the above object, the present invention provides:
An electronic component support structure provided in an electronic device including an electronic component and a heat dissipation member that dissipates heat generated from the electronic component, and supports the electronic component and cushions an impact applied to the electronic component from the outside. ,
A coil spring;
First connection means for connecting the coil spring to the electronic component;
Second connection means for supporting the coil spring so that the electronic component is elastically supported by the coil spring and connecting to the heat radiating member;
Comprising
The coil spring is formed of a strand having a rectangular cross section, and when the length in the axial direction of the rectangle is H and the length in the radial direction is W, (π / 4) <(H / W) <1 It is characterized by being.

  Since the support structure of the present invention also serves as a mechanism for transmitting heat generated from the electronic component to the heat radiating member, the number of components and the manufacturing cost of the electronic device can be reduced.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 is an external perspective view of a drive recorder provided with a support structure according to the first embodiment of the present invention, FIG. 2 is a perspective view of a state in which a top cover and a front panel are removed from the drive recorder of FIG. 1, and FIG. FIG. 4 is a perspective view of a coil spring used in the support structure of the first embodiment, and FIG. 5 is a cross-sectional view of the coil spring of FIG.

  A drive recorder 1 shown in FIG. 1 is mounted on a car and records a driver's driving operation and external images and data acquired by an imaging unit (not shown). It may be subject to vibration or sudden temperature changes in the car. The drive recorder 1 has a structure in which internal heat is released from the heat dissipation member to the outside.

  In FIG. 1, reference numeral 2 denotes a front panel, and an operation button group 3 is provided on the front surface thereof. Reference numeral 4 denotes a top cover that covers a portion behind the front panel 2 and is formed of a material having good thermal conductivity, and heat radiating fins 4a are provided on both side surfaces thereof. The top cover 4 is fitted in a state of being in close contact with a bottom plate 6 described later at the time of assembly, and has a dustproof structure that prevents external dust and the like.

  2 and 3, reference numeral 6 denotes a bottom plate, and a circuit board 7 is horizontally disposed above the bottom plate. A rear panel 8 is vertically attached to the rear end of the bottom plate 6. A plurality of studs 9 are provided on the upper surface of the bottom plate 6 so as to penetrate the circuit board 7 and are spaced from each other in the front, rear, left and right directions, and a pair of L-shaped brackets 10 extend forward and backward at their upper ends. Is attached.

  A rectangular parallelepiped HDD 11 is disposed between the brackets 10 and 10, and brackets 12 having an L-shaped cross section are screwed to both side surfaces thereof. In the present embodiment, the HDD 11 is of 2.5 type. The bottom plate 6, the stud 9, and the brackets 10 and 12 are each formed of a material having good thermal conductivity (for example, a copper plate).

  A plurality of coil springs 13 are provided between each bracket 12 and the bracket 10 facing it. As shown in FIG. 4, the coil spring 13 includes a coil spring main body 13a, an end plate 13b attached to one end thereof, and an end plate 13c attached to the other end of the coil spring main body 13a. Yes.

  As shown in FIG. 5, the coil spring main body 13a is formed of a strand having a rectangular cross-section, and when the axial dimension of the rectangle is H and the radial dimension is W, (π / 4) < (H / W) <1. In addition, as a material of a strand, the thing with favorable heat conductivity and excellent spring property is preferable, for example, phosphor bronze can be used. The end plates 13b and 13c are made of a material having good thermal conductivity, and have screw holes 13ba and 13ca in the center. More specifically, the coil spring main body 13a, the end plate 13b, and the end plate 13c are made of a material having the same thermal conductivity as that of the brackets 10 and 13 or a higher thermal conductivity than the brackets 10 and 13. It is good to be.

  As shown in FIG. 3, the end plate 13 b at one end of the coil spring 13 is screwed to the bracket 10, the end plate 13 c at the other end is screwed to the bracket 12, and the HDD 11 is elastic by the coil spring 13. It is in a supported state.

  In addition, as a method of attaching the coil spring 13 to the attached object, in addition to screwing, a method such as welding or riveting can be attached in close contact with the attached object so as to improve thermal conductivity. Is preferred.

  According to such a configuration, since the HDD 11 is elastically supported by the four coil springs 13, even if the drive recorder 1 receives an impact from the outside, the impact is absorbed by the coil spring 13 and the impact is not transmitted to the HDD 11. .

  The heat generated in the HDD 11 is transferred from each bracket 12 to each bracket 10 via each coil spring 13.

  As described above, the strand of the coil spring main body 13a has a rectangular cross-sectional shape, and the axial length H and radial length W of this rectangle satisfy (π / 4) <(H / W) <1. It is set to satisfy the relationship.

  As a result, the axial length of the coil is short and the cross-sectional area of the strand is large when the radial length of the cross-section is the same as when using a coil spring made of a strand having a general circular cross-section. It has the characteristics. Naturally, if the cross-sectional area is large, the thermal resistance is small, which is advantageous for heat transfer.

In detail about this, a coil spring made of a wire having a circular cross section (hereinafter, also referred to as a round spring) for, with its wire radius r, if the cross-sectional area as S1, is S1 = πr ^2.

  On the other hand, if the cross-sectional shape of a coil spring (hereinafter also referred to as a square spring) made of a strand having a rectangular cross section is represented by H and W as described above and the cross-sectional area is S2, S2 = H × W.

When a condition in which the radial lengths of both cross sections are the same, that is, W = 2r and the cross sectional area of the angular spring is larger, S1 <S2 and πr ² <(H × W) is obtained. = W / 2 is substituted and deformed to obtain a relationship of (π / 4) <(H / W) (hereinafter referred to as Expression 1).

  Further, under the condition of W = 2r, the axial length of the cross section of the spring element wire is greater than that of the round spring when (H / W) <1 (hereinafter referred to as Expression 2). Therefore, if H and W satisfy the relationship of (π / 4) <(H / W) <1, according to Equations 1 and 2, this angular spring is longer in the axial direction than the round spring. This is advantageous in that it has a small cross-sectional area and a small thermal resistance.

  Therefore, the heat transmitted from the HDD 11 to each bracket 12 is transmitted to each bracket 10 through each coil spring 13 with a small thermal resistance. Since each bracket 10 is fixed to the bottom plate 6 via the stud 9, the heat is transferred to the bottom plate 6. Since the bottom plate 6 is in contact with the outside air, heat can be radiated to the outside of the recorder.

  Further, since the bottom plate 6 is fitted in close contact with the top cover 4, the heat transmitted to the bottom plate 6 is also transferred to the top cover 4. Since the top cover 4 is in contact with the outside air and has the heat radiation fins 4a on the side surfaces, heat can be radiated from the heat radiation fins 4a.

  The support structure according to this embodiment including the brackets 10 and 12, the coil springs 13, and the studs 9 also serves as a mechanism for transmitting the heat generated in the HDD 11 to the bottom plate 6, thereby reducing the number of parts and the manufacturing cost of the drive recorder 1. can do.

  Next, a second embodiment of the present invention will be described. FIG. 6 is a perspective view of the drive recorder having the support structure of the second embodiment with the top cover and the front panel removed, and FIG. 7 is a sectional view of the drive recorder having the support structure of the second embodiment. is there. In the present embodiment, the same or similar parts as those in the first embodiment are denoted by the same reference numerals, and redundant descriptions are omitted.

  In the first embodiment, the coil springs 13 are provided on both sides of the HDD 11, but in this embodiment, the coil springs 13 are provided above and below the HDD 11 as shown in FIG. 6.

  As shown in FIG. 7, the HDD 11 is housed between a lower case 14 having a U-shaped cross section and an upper case 15 having an inverted U-shaped cross section. The lower case 14 and the upper case 15 are formed of a material having good thermal conductivity and are in close contact with the HDD 11, and the thermal resistance between the lower case 14 and the HDD 11 is small.

  One end of the coil spring 13 is screwed to each of the lower case 14 and the upper case 15. A lower bracket 16 is disposed below the lower case 14, and an upper bracket 17 is disposed above the upper case 15. The lower bracket 16 and the upper bracket 17 are formed of a material having good thermal conductivity, and the other end of the coil spring 13 is screwed.

  The lower bracket 16 is screwed to a plurality of studs 9 erected on the bottom plate 6. On the other hand, the upper bracket 17 is screwed to the top cover 4 from the upper surface side of the top cover 4 in a state where the top cover 4 is assembled to the bottom plate 6, and is fixed while being in contact with the lower surface of the top cover 4.

  Since the HDD 11 is elastically supported by the upper and lower coil springs 13, even if the drive recorder receives an impact from the outside, the impact is absorbed by the coil spring 13 and the impact is not transmitted to the HDD 11.

  The heat generated in the HDD 11 is transferred from the lower case 14 and the upper case 15 to the lower bracket 16 and the upper bracket 17 through the coil springs 13.

  Similar to the first embodiment, the wire of the coil spring main body 13a has a rectangular cross-sectional shape, and the relationship between the rectangular radial length W and the axial length H is (π / 4) <(H / W ) <1, and the thermal resistance is small. Accordingly, the heat transmitted from the HDD 11 to the lower case 14 and the upper case 15 is transmitted to the lower bracket 16 and the upper bracket 17 through the coil springs 13 with a small thermal resistance.

  Since the lower bracket 16 is fixed to the bottom plate 6 via the stud 9, the heat transmitted to the coil springs 13 below the HDD 11 is transmitted to the bottom plate 6. Since the bottom plate 6 is in contact with the outside air, heat can be radiated to the outside of the recorder.

  On the other hand, since the upper bracket 17 is in direct contact with the top cover 4, the heat transmitted to each coil spring 13 above the HDD 11 is transmitted to the top cover 4. Since the top cover 4 is in contact with the outside air and has the radiation fins 4a, it is possible to radiate heat from each radiation fin 4a.

  The support structure according to this embodiment including the lower case 14, the upper case 15, the lower bracket 16, the upper bracket 17, the coil spring 13, and the stud 9 also serves as a mechanism for transmitting heat generated in the HDD 11 to the bottom plate 6 and the top cover 4. Therefore, the number of parts and manufacturing cost of the drive recorder can be reduced.

  Note that the present invention is suitable for HDDs and disk drive devices that use circuits and actuators as heat sources, or devices (such as storage (recording) devices) that incorporate these. That is, it is applicable to a structure for protecting a stored exothermic device or the like from an impact in an operating state in a case for storing them or a portable bag (case).

It is an external appearance perspective view of the drive recorder provided with the support structure of the 1st Embodiment of this invention. FIG. 2 is a perspective view of a state where a top cover and a front panel are removed from the drive recorder of FIG. 1. It is sectional drawing of the drive recorder of FIG. It is a perspective view of the coil spring used for the support structure of a 1st embodiment. It is sectional drawing of the coil spring of FIG. It is a perspective view of the state which removed the top cover and the front panel from the drive recorder provided with the support structure of 2nd Embodiment. It is sectional drawing of the drive recorder provided with the support structure of 2nd Embodiment. It is sectional drawing of the information processing apparatus provided with the conventional support structure.

Explanation of symbols

1 Drive recorder (electronic equipment)
4 Top cover (heat dissipation member)
6 Bottom plate (heat dissipation member)
9 Stud (second connection means)
10 Bracket (second connecting means)
11 HDD (electronic parts)
12 Bracket (first connecting means)
13 Coil spring 14 Lower case (first connecting means)
15 Upper case (first connecting means)
16 Lower bracket (second connection means)
17 Upper bracket (second connecting means)

Claims (2)

An electronic component support structure provided in an electronic device including an electronic component and a heat dissipation member that dissipates heat generated from the electronic component, and supports the electronic component and cushions an impact applied to the electronic component from the outside. ,
A coil spring;
First connection means for connecting the coil spring to the electronic component;
Second connection means for supporting the coil spring so that the electronic component is elastically supported by the coil spring and connecting to the heat dissipation member;
Comprising
The coil spring is formed of a strand having a rectangular cross section, and when the length in the axial direction of the rectangle is H and the length in the radial direction is W, (π / 4) <(H / W) <1 A support structure for electronic parts, characterized in that there is. The electronic component support structure according to claim 1, wherein the electronic component is a storage device.