JP2013058681A - Member for fixing component and component fixing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a general-purpose member for fixing a component which can cope with a case where at least one of a plurality of components being attached to each other is changed.SOLUTION: A member 1 for fixing a plurality of components 3, 4 to each other includes a proximal part 8 having a hollow part at at least one end, and a shaft 7 a portion of which can enter the hollow part and can advance and retract in the longitudinal direction for the proximal part 8. The proximal part 8 is positioned for one of the plurality of components 3, 4 being fixed to each other, and a portion of the shaft 7 projecting from the interior of the hollow part of the proximal part 8 is positioned for the other of the plurality of components 3, 4. The length can be adjusted by advancing or retracting the shaft 7 to or from the proximal part 8.

Description

  The present invention relates to a component fixing member and a component fixing structure.

  An electronic device or the like incorporates electronic components that are attached to a frame, a substrate, or the like and constitute an electric circuit. Some of these electronic components have a fixed operating temperature for stable operation of the electric circuit, but some generate heat (becomes a heating element) during circuit operation. is there. Although the technology to reduce the power consumption of electronic components has been remarkably advanced due to the miniaturization of the design process and the advancement of circuit formation technology, certain electronic devices have been developed by increasing the density and multi-functionality of electronic components as technology advances. There is a tendency for electrical loads to be concentrated on parts. Due to the concentration of electrical loads on such specific electronic components, there is an increasing need to more strictly limit the conditions (such as operation guarantee temperature) for operating the electronic components.

  In order to ensure stable operation of the electrical circuit while strictly maintaining the guaranteed operating temperature of the electronic parts that are heating elements, heat sinks or cold plates that are heat dissipation parts (heat radiators) are brought into surface contact with the electronic parts and air cooled. It is common to efficiently radiate or cool by a method or a water cooling method.

  When the heatsink is bonded to an electronic component with an adhesive, the heatsink is peeled off from the electronic component against the adhesive force of the heatsink or the electronic component when the heatsink or the electronic component is warped. Contact may not be maintained. In such a case, a sufficient heat dissipation effect by the heat radiator cannot be obtained, and the electronic component may be overheated exceeding the operation guarantee temperature. Therefore, as shown in Patent Documents 1 to 4, a component fixing member that uses a spring force to press the radiator against the electronic component is used.

JP 2000-31677 A JP 2000-64997 A JP 2000-130389 A JP-A-10-70222

  Various parts fixing members such as screws, hooks, leaf springs, and specially designed mechanical parts are used to attach and fix the heat radiator to electronic parts. Among these, specially designed mechanism products are not preferable due to their high manufacturing costs, so use, shape, and characteristics (for example, load resistance of electronic components) from general-purpose fixing members such as screws, hooks, leaf springs, etc. Appropriate ones are selected according to. However, as the density of electric circuits is increased and the cost is reduced, it is also necessary to reduce the size and commonality of component fixing members, and the component fixing members used for general purposes may not be able to cope with them. . The number of electronic parts designed exclusively for increasing the density and performance of electric circuits has increased, and the parts fixing parts for fixing the heat sink need to have a configuration corresponding to the configuration of the electronic parts designed exclusively. ing.

  In addition, when the combination of the electronic component and the radiator is changed, it is necessary to reselect a member having a suitable size and height from among general-purpose component fixing members. If there is no compatible product in the general-purpose product, a specially designed component fixing member is manufactured, the general-purpose product is modified, or other components are changed to match the component fixing member. Measures such as changing itself are necessary. In this way, when electronic components and heatsinks are changed, component fixing members cannot be shared, and it takes time to reselect, redesign, and manufacture component fixing members, and increase manufacturing costs. Is inevitable.

  The component fixing members described in Patent Documents 1 to 4 can cope with some dimensional changes of the electronic component and the heat radiating body by using a spring, but cannot cope with a large dimensional change.

  Accordingly, the object of the present invention is a fixing member for solving the above-described problems and attaching another component to a certain component, and can be used even if at least one of the components to be mounted is changed. It is an object of the present invention to provide a component fixing member that can be used and a component fixing structure using the same.

  In one embodiment of the present invention, a component fixing member for fixing a plurality of components to each other includes a base portion having a hollow portion at least at one end portion, and a part thereof enters the hollow portion and can advance and retreat in the longitudinal direction with respect to the base portion And the base portion is positioned with respect to one of the plurality of components fixed to each other, and a portion of the shaft portion that protrudes from the hollow portion of the base portion is formed of the plurality of components. It is positioned with respect to the other of them, and the length can be adjusted by moving the shaft part forward and backward with respect to the base part.

  According to the present invention, since the length of the component fixing member can be easily changed, it can be used universally corresponding to the difference in dimensions of components to be fixed. And the reliability of fixation can be easily improved by applying an appropriate load to parts to be fixed.

It is a front view which shows the component fixing structure of one Embodiment of this invention. It is an expanded sectional view which shows the component fixing member of the component fixing structure shown in FIG. It is an expanded sectional view which abbreviate | omits and shows the principal part of an example of the component fixing member of this invention. (A) is an expanded perspective view which abbreviate | omits a spring and shows the other example of the component fixing member of this invention, (b) is an expanded sectional view which shows the principal part. (A) is an expanded perspective view which abbreviate | omits a spring and shows further another example of the component fixing member of this invention, (b) is an expanded sectional view which shows the principal part. It is a front view which shows the component fixing structure of other embodiment of this invention. It is an expanded sectional view which shows the component fixing member of the component fixing structure shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a structure in which a heat dissipating component (heat dissipating body) 4 which is one component to be fixed is fixed to an electronic component (the other component) 3 on a substrate 2 by a component fixing member 1 of the present invention. It is shown. Specifically, an electronic component 3 is mounted on a substrate 2 constituting an electric circuit via solder balls 5 constituting a BGA (ball grid array). The electronic component 3 is a heating element that generates heat during operation of the electric circuit. And the heat sink 4 which is an example of the air-cooling type thermal radiation body is attached to the upper surface of the electronic component 3 via the heat conductive agent 6. FIG. When the electronic component 3 is warped rather than completely flat due to its own manufacturing tolerance or thermal stress during mounting, the thermal conductive agent 6 may reduce the contact area with the heat sink 4 and reduce thermal conduction. Therefore, it is used to assist heat conduction between the electronic component 3 and the heat sink 4 to increase the heat dissipation effect.

  An enlarged view of the component fixing member 1 is shown in FIG. The component fixing member 1 mainly includes a shaft portion 7 and a base portion 8 constituting a fixing pin structure, and a coiled spring 9 disposed on the outer periphery of the base portion 8. A fixing hook 7 a is formed on the shaft portion 7. A large-diameter spring pressing portion 8 a is formed at one end (upper end) of the base portion 8, and the spring pressing portion 8 a presses a coiled spring 9 located on the outer periphery of the base portion 8. The other end (lower end) side of the base portion 8 has a hollow cylindrical shape, and a portion of the shaft portion 7 opposite to the fixing hook 7 a enters the hollow portion of the cylindrical base portion 8. The shaft portion 7 is held so as to be movable back and forth in the longitudinal direction with respect to the base portion 8 and cannot be detached from the base portion 8, thereby forming a fixed pin structure including the shaft portion 7 and the base portion 8. When the shaft portion 7 moves back and forth with respect to the base portion 8, the total length of the fixed pin structure can be adjusted.

  The heat sink 4 shown in FIG. 1 has a flange portion 4 a on the surface facing the substrate 2 and the electronic component 3. The flange portion 4 a is provided with a through-hole having a diameter larger than the outer diameter of the base portion 8 of the component fixing member 1 and smaller than the coiled spring 9 positioned on the outer periphery of the base portion 8. Accordingly, the spring 9 positioned on the outer periphery of the base portion 8 is held between the spring pressing portion 8a and the upper surface of the flange portion 4a (in the range of the interval a shown in FIG. 1), and the shaft portion 7 and the base portion 8 are flanged. The through hole of the portion 4a can be freely penetrated. The substrate 2 is provided with a through-hole facing the through-hole of the flange portion 4a and having the same diameter as the through-hole of the flange portion 4a. The shaft portion 7 of the component fixing member 1 passes through both through holes. That is, in a state where the fixing hook 7a of the shaft portion 7 is elastically deformed and reduced in diameter, each of the through holes of the substrate 2 is passed, and then the fixing hook 7a is returned from the elastically deformed state to the initial state. The fixing hook 7a is engaged with and fixed to the lower surface of 2 (the surface opposite to the mounting surface of the electronic component 3).

  According to this configuration, the shaft portion 7 is positioned with respect to the through hole of the flange portion 4a of the substrate 2 and the electronic component 3 or the heat sink 4 by the fixing hook 7a. On the other hand, the base portion 8 is also positioned through the connection with the shaft portion 7 and the spring 9 inserted between the spring pressing portion 8a and the upper surface of the flange portion 4a. The electronic component 3 and the heat sink 4 are joined to each other in the space between the positioned portion of the base portion 8 and the positioned portion of the shaft portion 7. Then, the heat sink 4 is urged by the spring 9 and the pressure contact state with the electronic component 3 is maintained. Even if some warping or deformation occurs in the heat sink 4 or the electronic component 3, the surface contact between the heat sink 4 and the electronic component 3 is maintained by the spring force of the spring 9. The load applied to the electronic component 3 by the heat sink 4 is adjusted by adjusting the spring constant of the spring 9 located on the outer periphery of the base portion 8 and the size of the distance a between the spring pressing portion 8a and the upper surface of the flange portion 4a. can do.

  As described above, a mechanism for making the shaft portion 7 advanceable / retreatable and non-detachable with respect to the base portion 8 will be described with a specific example. 3 to 5 referred to in the following description, the spring 9 located on the outer periphery of the base 8 is not shown.

  In the example shown in FIG. 3, a male screw 7 b is formed at the end of the shaft portion 7 opposite to the fixing hook 7 a, and a female screw 8 b is formed in the hollow portion of the base portion 8. Then, when the male screw 7b is screwed into the female screw 8b, the shaft portion 7 is held on the base portion 8b so as not to be detached. The total length of the component fixing member 1 is determined by the amount of the shaft portion 7 entering the hollow portion of the base portion 8, that is, the amount of the male screw 7b screwed into the female screw 8b.

  The force for maintaining the state where the heat sink 4 is in pressure contact with the electronic component 3 and is in surface contact is determined by the biasing force of the spring 9 mainly determined by the spring constant and the interval a as described above. Even if the same components are used, if the distance b (see FIG. 1) between the upper surface of the substrate 2 and the lower surface of the flange 4 differs due to tolerances, warpage of the electronic component 3, etc., the defined shaft portion 7 and base portion 8 If the height is not changed, the interval a changes. Therefore, even if the heat sink 4 and the electronic component 3 are warped or deformed, the screwing amount of the male screw 7b into the female screw 8b, that is, a force necessary to maintain the surface contact between the heat sink 4 and the electronic component 3, ie, The length (the interval a and the interval b) of the component fixing member 1 is determined by appropriately adjusting the advance / retreat amount of the shaft portion 7 with respect to the base portion 8.

  Since the component fixing member 1 of the present embodiment can adjust the overall length, even when the dimensions of the electronic component 3 and the heat sink 4 are changed, by adjusting the screwing amount of the male screw 7b into the female screw 8b, That is, the distance a can be handled by rotating the base portion 8 according to the pitch and the rotation width of the male screw 7b and the female screw 8b. Therefore, it is not necessary to use a specially designed component, and the component fixing member 1 that can be used as a general-purpose product without special modification is obtained. By adjusting the length of the component fixing member 1, the spring force by the spring 9 is also changed, and the force for pressing the heat sink 4 against the electronic component 3 can be adjusted. Thereby, even if the electronic component 3 or the heat sink 4 is warped, the heat sink 4 can be pressed against the electronic component by the spring force of the spring 9 to maintain the surface contact. Therefore, the reliability of heat dissipation and cooling is high.

  In the example shown in FIG. 4, a plurality of tapered locking portions 7 c are stacked on the end portion of the shaft portion 7 opposite to the fixing hook 7 a. The hollow portion of the base portion 8 is formed with a claw portion 8c that can be engaged with each locking portion 7c and can be elastically deformed. In this configuration, the claw portion 8c is movable in one direction (the direction in which the claw portion 8c is lowered) while being in contact with each locking portion 7c, but is in the opposite direction (the direction in which the claw portion 8c is raised). 8c is locked by the locking portion 7c and cannot move. That is, what is called a one-way clutch is comprised by the some latching | locking part 7c and the nail | claw part 8c. However, the locking portion 7c and the claw portion 8c are not formed over the entire circumference, and the locking portion 7c and the other portion 7d are periodically provided at regular intervals on the shaft portion 7, similarly. The base portion 8 is provided with claw portions 8c and other portions at regular intervals. Therefore, when the base portion 8 is rotated with respect to the shaft portion 7 so that the claw portion 8c faces the portion 7d other than the locking portion, the base portion 8 can be freely moved up and down with respect to the shaft portion 7. . In this configuration, the length can be adjusted depending on which locking portion 7c of the plurality of locking portions 7c is engaged with the claw portion 8c. Therefore, when the claw portion 8c is opposed to the portion 7d other than the locking portion and the base portion 8 is moved with respect to the shaft portion 7 and reaches a desired position, the base portion 8 is rotated with respect to the shaft portion 7. What is necessary is just to make it the nail | claw part 8c oppose to the latching | locking part 7c, and to engage with it. As a result, the length of the component fixing member 1 may be determined so that a force for maintaining the state in which the heat sink 4 is in pressure contact with the electronic component 3 and is in surface contact may be obtained.

  In the example shown in FIG. 5, the base 8 has a cylindrical shape having a through-hole 8d, and the shaft portion 7 has a fixing hook 7a and a lower portion (large diameter portion) 7e having substantially the same outer diameter as the base portion 8. And a small-diameter upper portion (a portion capable of penetrating the through hole) 7f extending from the radial center of the lower portion 7e to the side opposite to the fixing hook 7a along the longitudinal direction of the shaft portion 7. A staircase structure including a reverse rotation preventing claw 8 e is formed at the lower end of the cylindrical base 8. This staircase structure has a plurality of receiving portions 8f into which positioning projections 7g of a lower portion 7e, which will be described later, are fitted, and a slope extending from a part of the receiving portion 8f to reach the reverse rotation preventing claw 8e. The plurality of receiving portions 8f are arranged side by side with the height being changed little by little. A positioning projection 7g protruding upward and a support portion 7h are provided on the outer peripheral portion of the lower portion 7e.

  The upper portion 7 f of the shaft portion 7 passes through the through hole 8 d of the base portion 8, whereby the shaft portion 7 is held by the base portion 8 so as not to be detached. Then, when the positioning projection 7 g is fitted into one of the plurality of receiving portions 8 f of the base portion 8, the relative position between the shaft portion 7 and the base portion 8 is defined. At this time, the inclined surface which is one side of the positioning projection 7g contacts the inclined surface of the base portion 8, and the inclined surface of the receiving portion 8f to which the positioning protrusion 7g is not fitted contacts the inclined surface of the support portion 7h of the lower portion 7e. ing. As a result, the shaft portion 7 and the base portion 8 are stably held together.

  In this configuration, the length can be adjusted depending on which receiving portion 8f of the plurality of receiving portions 8f is fitted with the positioning projection 7g. Therefore, the total length of the component fixing member 1 can be changed by rotating the base portion 8 with respect to the shaft portion 7 and changing the receiving portion 8f fitted to the positioning projection 7g. Thereby, it is possible to obtain a force for maintaining the state in which the heat sink 4 is in pressure contact with the electronic component 3 and is in surface contact. However, since the reverse rotation preventing claw 8e is provided, the base 8 can rotate only in one direction (leftward in FIG. 5B) with respect to the shaft portion 7. The reverse rotation preventing claw 8e has a function of increasing the stability of fitting between the positioning projection 7g and the receiving portion 8f. In order to more reliably maintain the relative position of the shaft portion 7 and the base portion 8 after determining the total length of the component fixing member 1 in this manner, the base portion 8 is fixed to the shaft portion 7 by a biasing means (spring or the like) not shown. It can be energized to the side. Further, when it is not possible to change the entire length of the component fixing member 1, the base portion 8 may be fixed to the upper portion 7 f of the shaft portion 7 using screws, nuts, or the like. Furthermore, the base 8 may return to its original height when the base 8 rotates 360 degrees with respect to the shaft 7 by a reset mechanism (not shown).

  In the example shown in FIGS. 1 to 5, the component fixing member 1 is fixed to the substrate 2 by a fixing hook 7 a provided on the shaft portion 7. However, as shown in FIG. 6, a small-diameter screw portion 7 i is provided on the shaft portion 7, and the screw portion 7 i passes through the through-hole of the substrate 2 and protrudes below the substrate 2. A configuration may be employed in which the fixing nut 10 is screwed into the screw portion 7 i below to fix the component fixing member 1 to the substrate 2. In this case, the through hole of the substrate 2 has a larger diameter than the screw portion 7 i, but has a smaller diameter than the portion other than the screw portion 7 i of the shaft portion 7. And the through-hole of the flange part 4a is smaller diameter than the large diameter part 8g of the base 8, but larger diameter than the other part. According to this configuration, the distance b between the lower surface of the flange portion 4a and the upper surface of the substrate 2 is determined by the amount by which the screw portion 7i is screwed into the fixing nut 10, and the load applied to the electronic component 3 by the heat sink 4 is determined. 9 is unnecessary. The shaft portion 7 and the base portion 8 are formed in the same manner as in any of the examples shown in FIGS. 1 to 5, that is, the male screw 7b and the female screw 8b, the plurality of locking portions 7c and the claw portions 8c, the positioning projection 7g, and the receiving portion 8f. May be connected to each other.

  Although not shown, in the case where a plurality of electronic components 3 are mounted on one substrate 2 and the heat sinks 4 are attached to the respective electronic components 3, each of the electronic components 3 and the heat sinks 4 is shown in FIG. A component fixing member 1 as shown in FIG. By appropriately adjusting the total length of each component fixing member 1 by any one of the methods described above, it is possible to cope with the difference in dimensions of each electronic component 3 and each heat sink 4 and the tolerance of each warp and height. The heat sink 4 can be brought into contact with the electronic device 3 with a load suitable for each, and good cooling can be performed with high reliability.

  The heat dissipation component is not limited to the heat sink 4, and various components can be used as long as the component can dissipate or cool the electronic component 3 by air cooling or water cooling. For example, a cold plate may be used as a component for heat dissipation.

1 Component fixing member 2 Substrate 3 Electronic component (the other component)
4 Heat sink (one component for heat dissipation)
4a Flange part 7 Shaft part 7a Fixing hook 7b Male screw 7c Locking part 7e Lower part (large diameter part)
7f Upper part (part that can penetrate through hole)
7g Positioning projection 7i Screw part 8 Base part 8a Spring pressing part 8b Female screw 8c Claw part 8d Through hole 8f Receiving part 9 Spring 10 Fixing nut

Claims (10)

A component fixing member for fixing a plurality of components to each other,
A base portion having a hollow portion at least at one end portion, and a shaft portion that partially enters the hollow portion and is movable forward and backward in the longitudinal direction with respect to the base portion,
The base is positioned with respect to one of a plurality of parts fixed together;
A portion of the shaft portion that protrudes from the hollow portion of the base portion is positioned with respect to the other of the plurality of parts,
A component fixing member that is adjustable in length by advancing and retracting the shaft portion relative to the base portion.   A female screw is formed in the hollow portion of the base portion, and a male screw that is screwed into the female screw is formed in a portion that enters the hollow portion of the shaft portion. The component fixing member according to claim 1, wherein the length of the component fixing member is adjustable.   A claw portion is provided on the base portion, and a plurality of locking portions that can be engaged with the claw portion are formed on a portion of the shaft portion that enters the hollow portion, and the plurality of locking portions The component fixing member according to claim 1, wherein the length can be adjusted depending on which locking portion of the portions is engaged with the claw portion. The base portion has a through hole, the shaft portion has a portion capable of penetrating the through hole, and a portion having a larger diameter than the through hole,
Positioning protrusions are provided on the large-diameter portion of the shaft portion, and a plurality of receiving portions into which the positioning protrusions can be fitted are formed on the base portion. Of the plurality of receiving portions, The component fixing member according to claim 1, wherein the length can be adjusted depending on which receiving portion of the positioning projection is fitted into.   5. The component fixing member according to claim 1, wherein a coiled spring is disposed on an outer periphery of the base portion, and a spring pressing portion is provided on the base portion. The spring is held between one of the parts and the spring pressing portion of the base,
The shaft portion has a fixing hook that engages with the other component or the substrate on which the other component is mounted at the end of the base opposite to the portion entering the hollow portion. The component fixing member according to claim 5.   The screw part provided in the edge part on the opposite side to the part which penetrates in the said hollow part of the said base part of the said shaft part, and the fixing nut into which this screw part is screwed in. 5. The component fixing member according to any one of items 1 to 4. The component fixing member according to any one of claims 1 to 7,
A component fixing structure in which the plurality of components are joined to each other in a space between the positioned portion of the base portion and the positioned portion of the shaft portion.   The component fixing structure according to claim 8, wherein one of the components is a heat radiator, and the other component is an electronic component mounted on a substrate.   The base portion is located on a flange portion of the radiator, and the shaft portion passes through a through hole provided in the flange portion and a through hole provided in the substrate, and the electronic component of the substrate is The component fixing structure according to claim 9, wherein the component fixing structure is fixed to a surface opposite to the mounted surface.

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