JP5316398B2 - Heat dissipation device - Google Patents

Description

  Embodiments described herein relate to a heat dissipation device including a movable heat dissipation portion.

Conventionally, when a component with a large amount of heat generation is mounted on a package, the heat generated from the component is usually dissipated by mounting a radiation fin.
There are various types of fixing methods for the heat dissipating fins. For example, the following two fixing methods may be mentioned.

  The first fixing method is to measure the height of a component that generates heat, interpose a spacer according to the height between the radiating fin and the heating element, and fix the radiating fin to the heating element with screws or the like. Is.

The second fixing method is to fix the heat dissipating fin to the heating element in a state in which the heat dissipating fin is always urged to the component side by a coil spring or a leaf spring.
FIG. 13 is a schematic plan view showing the heat radiating fins 210 and the substrate unit 200.

14 and 15 are explanatory views showing an example of a fixing method of the heat radiation fins 210 and 220. FIG.
As shown in FIG. 13, a plurality of heat radiating fins 210 are arranged on a substrate unit 200 that is a heating element. Each radiating fin 210 is arranged on the upper part of the component 201 shown in FIG. 14 provided on the board unit 200.

  As shown in FIG. 14, the radiating fins 210 are fixed to the substrate unit 200 with fixing screws 211 and nuts 212 with a spacer 213 interposed therebetween. The spacer 213 is selected according to the height of the component 201.

  On the other hand, the radiating fin 220 shown in FIG. 15 is fixed to the mounting bracket 221, which is a leaf spring, for example, by a fixing screw 222. The mounting bracket 221 is fixed to the board unit 200 with fixing screws 223.

  Thermal bonding materials 214 and 224 such as a compound and a thermal sheet are inserted between the heat radiation fins 210 and 220 shown in FIGS. 14 and 15 and the component 201 that generates heat to fill these gaps.

By the way, a semiconductor cooling module is known in which a wedge-shaped cooling element is pressed between a semiconductor element and a heat conductor by a pressing spring.
In addition, as a cooling device, a heat transfer piston formed in a polygonal shape in plan view having a pair of planar intersecting side walls is pressed in the direction of the intersection of the pair of planar intersecting sidewalls, so that the inner wall surface of the piston insertion hole Are known to be pressed into a wedge shape.

Japanese Patent Laid-Open No. 3-6848 JP 2004-31467 A

  Of the two examples of the fixing method of the heat dissipating fins described above, the first fixing method measures the height of the component that generates heat in order to select the space to be used, and therefore requires adjustment man-hours. Moreover, if a heat radiating fin is provided for each component, sufficient heat radiating efficiency cannot be obtained with a single heat radiating fin.

  Further, since the spacer height varies, it is difficult to stably attach the radiating fin to the heat-generating component without a gap. For this reason, a thermal bonding material such as a thermal sheet or a compound is used. In addition, a plurality of types of spacers are prepared.

  In the second fixing method, the heat dissipating fins are urged to the heat generating component side by a coil spring or a leaf spring. However, as with the first fixing method, if a heat dissipating fin is provided for each heat generating component, A heat dissipation fin cannot provide sufficient heat dissipation efficiency.

  An object of the present invention is to simplify the adjustment work at the time of installation in a heat dissipation device. Moreover, it aims at providing the heat radiating device which can improve the thermal radiation efficiency of a heat generating body.

  A heat dissipating device disclosed in the present specification includes a base portion fixed to a heat generating element, a movable heat dissipating part that dissipates heat generated from the heat generating element, a first urging mechanism, and a second urging mechanism. . The first urging mechanism urges the movable heat radiating portion toward the heating element. The second urging mechanism urges the movable heat radiating portion toward the base portion in a direction different from the urging direction of the first urging mechanism.

  According to the heat radiating device disclosed in the present specification, the adjustment work at the time of attachment can be simplified. Moreover, the heat dissipation efficiency of the heating element can be increased.

It is a schematic plan view which shows a thermal radiation apparatus and a board | substrate unit. It is a top view which shows a movable fin part and a two-way biasing part transparently. It is a front view which shows a movable fin part and a two-way urging | biasing part transparently. It is the arrow line view which saw the movable fin part and the two-way urging | biasing part transparently from the A direction of FIG. 2A. It is a schematic perspective view which shows a two-way urging | biasing part. It is a general | schematic disassembled perspective view which shows a two-way biasing part. It is a top view which shows a movable fin part. It is a front view which shows perspectively the two-way biasing part which concerns on a modification. It is a side view which shows transparently the two-way biasing part of the state which removed the torsion spring and the cam. It is a top view which shows transparently the two-way biasing part of the state which removed the torsion spring and the cam. It is a side view which shows transparently the two-way biasing part of the state which removed the compression spring and the roller. It is a top view before the urging | biasing which shows the two-way urging | biasing part of the state which removed the compression spring and the roller transparently. It is a top view after urging | biasing which shows the two-way urging | biasing part of the state which removed the compression spring and the roller transparently. It is a front view of a movable fin part and a two-way urging part for explaining urging force of a two-way urging part. It is a top view of a movable fin part and a two-way urging part for explaining urging force of a two-way urging part. It is a top view which shows the thermal radiation apparatus and board | substrate unit which concern on a modification. It is a perspective view which shows a thermal radiation apparatus and a board | substrate unit. It is the B section enlarged view of FIG. 10A. It is a perspective view which shows the fin part and board | substrate unit which concern on a comparative example. It is a graph which shows the temperature distribution of embodiment and a comparative example. It is a schematic plan view which shows a radiation fin and a board | substrate unit. It is explanatory drawing (the 1) which shows the example of the fixing method of a radiation fin. It is explanatory drawing (the 2) which shows the example of the fixing method of a radiation fin.

Hereinafter, a heat dissipation device according to an embodiment will be described with reference to the drawings.
FIG. 1 is a schematic plan view showing the heat dissipation device 1 and the substrate unit 100.
2A and 2B are a plan view and a front view showing the movable fin portion 20 and the two-way urging portion 30 in a perspective manner.

FIG. 2C is an arrow view of the movable fin portion 20 and the two-way urging portion 30 as seen through from the direction A in FIG. 2A.
3A and 3B are a schematic perspective view and a schematic exploded perspective view showing the two-way urging portion 30.

FIG. 4 is a plan view showing the movable fin portion 20.
As shown in FIG. 1, the heat dissipation device 1 includes a fixed fin portion 10 fixed to the substrate unit 100 and a plurality of movable fin portions 20 connected to the fixed fin portion 10 so as to be movable independently of each other. . In addition, in FIG. 1, illustration of the two-way urging | biasing part 30 arrange | positioned 2 with respect to each movable fin part 20 is abbreviate | omitted.

  As shown in FIGS. 2B and 2C, the movable fin portion 20 contacts the upper surface of a component 101 that is an electronic component, for example, disposed on the substrate unit 100, thereby generating heat generated from the substrate unit 100 (component 101). Dissipates heat by heat conduction.

On the other hand, the fixed fin portion 10 radiates heat generated from the substrate unit 100 through the movable fin portion 20 by heat conduction.
Here, the substrate unit 100 is an example of a “heating element”. The fixed fin portion 10 is an example of a “base portion” that also functions as a “fixed heat dissipation portion” in the present embodiment. The movable fin portion 20 is an example of a “movable heat dissipation portion”. The fixed fin portion 10 and the movable fin portion 20 are made of, for example, metal in order to dissipate heat generated from the component 101 by heat conduction.

  As shown in FIG. 1, the fixed fin portion 10 is formed with a plurality of fins 10 a that extend in a straight line from the front end of the upper surface (the lower end in the paper of FIG. 1) and the rear end in parallel. The fixed fin portion 10 is fixed to the substrate unit 100 by a plurality of fixed fin fixing screws 40.

  The fixed fin portion 10 is formed with a plurality of movable fin housing holes 10b each housing one movable fin portion 20. The movable fin housing hole 10b is formed so as to penetrate the fixed fin portion 10 in the height direction.

  The movable fin housing hole 10b is formed in a substantially square shape larger than the movable fin portion 20 in a plan view so as to secure a moving space for moving the movable fin portion 20 having a substantially square shape in a plan view in the horizontal direction.

  In the movable fin portion 20 shown in FIG. 4, a plurality of fins 20 a extending in a straight line are formed in parallel with each other over the front end (the lower end in FIG. 4) and the rear end of the upper surface. Of the four corners of the movable fin portion 20 in plan view, the two-direction urging portions 30 are disposed at two corners facing in the diagonal direction.

As shown in FIGS. 2B and 2C, flange portions 20b are formed at two corners of the movable fin portion 20 where the two-way urging portions 30 are disposed.
The flange portion 20 b is formed so as to protrude in the horizontal direction from the lower end of the movable fin portion 20. The flange portion 20b is formed with a through hole 20c that allows a shaft 33 (described later) of the two-way urging portion 30 to pass through in the height direction.

  As shown in FIGS. 2B and 2C, the bottom surface of the movable fin portion 20 is a flat surface, but an inclined surface 20d is formed on the top surface between the formation surface of the fin 20a and the flange portion 20b. The thickness of the movable fin portion 20 in the height direction is the smallest at the flange portion 20b, and gradually increases by the inclined surface 20d as the flange portion 20b approaches the formation surface of the fin 20a.

  As shown in FIG. 2A, FIG. 4 and the like, the movable fin portion 20 is formed with a semi-elliptical cam recess 20e extending upward from the formation surface of the fin 20a and the inclined surface 20d. A pressing pin 35a (see FIG. 3B) of the cam 35 described later is inserted into the cam recess 20e.

  As described above, the two-way urging portion 30 is disposed at two corners facing each other in the diagonal direction among the four corners of each movable fin portion 20 in plan view. The two-way urging portion 30 connects the movable fin portion 20 to the fixed fin portion 10 so as to be movable.

  As shown in FIGS. 3A and 3B, the bi-directional biasing portion 30 includes a bracket 31, a bracket fixing screw 32, a shaft 33, a torsion spring 34, a cam 35, a compression spring 36, and a low friction member. 37, a roller 38, and a stopper 39.

  The compression spring 36 and the roller 38 urge the movable fin portion 20 toward the substrate unit 100 in the first urging direction (arrow D1) that is vertically downward in the present embodiment. ”.

  The torsion spring 34 and the cam 35 have a second direction that is different from the first biasing direction (arrow D1) (horizontal direction in the present embodiment) with the movable fin portion 20 facing the fixed fin portion 10. It functions as a “second urging mechanism” for urging in the urging direction (arrow D).

As described above, the two-way urging unit 30 independently moves the movable fin unit 20 in the first urging direction (arrow D1) and the second urging direction (arrow D2) orthogonal to the first urging direction (arrow D1). Energize.
In the bracket 31, a horizontal fixed end portion 31a, a vertical vertical portion 31b, and a horizontal free end portion 31c are continuously formed integrally. The bracket 31 is fixed to the fixed fin portion 10 by a bracket fixing screw 32 at the fixed end portion 31a.

The free end portion 31c is formed at a position higher than the fixed end portion 31a by sandwiching the vertical portion 31b between the free end portion 31c and the fixed end portion 31a.
The free end portion 31c is formed at a position higher than the fixed end portion 31a between the free end portion 31c and the flange portion 20b (movable fin portion 20) positioned below the first end, which will be described later. This is because the urging mechanism and the second urging mechanism are arranged.

  The shaft 33 is provided so as to extend vertically downward from the bottom surface of the free end portion 31 a of the bracket 31. The shaft 33 is formed with a large-diameter portion 33a with which an upper end of a compression spring 36, which will be described later, abuts, and a small-diameter portion 33b, with which a stopper 39, which will be described later, is fitted.

The torsion spring 34 is inserted into the shaft 33 from below and is disposed below the free end 31 c of the bracket 31.
The upper end portion 34 a bent vertically upward of the torsion spring 34 is inserted from below into a spring receiving hole 31 d formed in the free end portion 31 c of the bracket 31. A lower end portion 34b bent vertically downward of the torsion spring 34 is inserted into a spring receiving hole 35b formed in the cam 35 from above.

  The cam 35 is formed with a pressing pin 35a protruding vertically downward. The pressing pin 35 a presses the side wall of the cam recess 20 e of the movable fin portion 20 when the cam 35 rotates about the shaft 33 by the urging force applied by the torsion spring 34.

  In the two two-way urging portions 30 provided on the movable fin portion 20, the torsion springs 34 are arranged so that the rotation directions of the cams 35 are opposite to each other. By these two two-way urging portions 30, the movable fin portion 20 is moved in the second urging direction (the lower right side of the drawing indicated by the arrow D2 in FIG. 2A) to the side wall of the movable fin receiving hole 10b of the fixed fin portion 10. It is energized towards.

  The compression spring 36 is inserted into the shaft 33 from below, and the upper end abuts against the bottom surface of the large diameter portion 33 a of the shaft 33. The compression spring 36 applies an urging force in the first urging direction (vertically downward) to the movable fin portion 20 via the roller 38.

  The roller 38 is formed with a through hole 38a through which the shaft 33 serving as a rotation center passes. A part of the upper end side of the through hole 38a is a spring accommodating portion 38b formed to have a larger diameter than the through hole 38a so as to accommodate a part of the lower end side of the compression spring 36.

  Between the lower end of the compression spring 36 and the bottom surface of the spring accommodating portion 38b, the low friction member 37, which is a ring-shaped sheet, for example, prevents the rotation of the roller 38 from being disturbed by contact with the lower end of the compression spring 36. Is arranged.

  The roller 38 is formed with a tapered portion 38c that decreases in diameter as it goes vertically downward in the first urging direction (arrow D1). The inclination angle of the tapered portion 38c with respect to the vertical direction is the same as the inclination angle of the inclined surface 20d of the movable fin portion 20 with respect to the vertical direction.

  When the movable fin portion 20 moves while being biased toward the fixed fin portion 10 by the torsion spring 34 and the cam 35, the roller 38 rotates while the tapered portion 38 c contacts the inclined surface 20 d of the movable fin portion 20. .

  There is a gap between the bottom surface of the roller 38 and the flange portion 20 b of the movable fin portion 20, and the downward biasing force of the compression spring 36 causes the tapered portion 38 c of the roller 38 on the inclined surface 20 d of the movable fin portion 20. Via the movable fin portion 20.

  The stopper 39 is, for example, an E-ring, and is positioned below the flange portion 20 b of the movable fin portion 20 with a gap from the flange portion 20 b and is fitted to the small diameter portion 33 b of the shaft 33.

  In the present embodiment, the urging force in the first urging direction (arrow D 1) is obtained by the compression spring 36. However, as long as the movable fin portion 20 is urged toward the substrate unit 100. Alternatively, a torsion spring or other elastic member inclined in the horizontal direction may be used.

  In the present embodiment, the urging force in the second urging direction (arrow D2) is obtained by the torsion spring 34. However, the movable fin portion 20 may be urged toward the fixed fin portion 10. For example, a compression spring or other elastic member inclined in the horizontal direction may be used.

  Moreover, you may use the two-way biasing part fixed to the board | substrate unit 100 instead of the fixed fin part 10 like the two-way biasing part 30 'shown in FIG. In this case, the movable fin portion 20 is movably connected to the substrate unit 100 instead of the fixed fin portion 10.

  5 includes a shaft fixing screw 32 ′ instead of the bracket 31 and the bracket fixing screw 32. The bi-directional biasing portion 30 ′ shown in FIG. The shaft fixing screw 32 ′ passes through the substrate unit 100 from below the substrate unit 100 and is inserted into the shaft 33.

  In addition, since the bracket 31 is omitted in the bi-directional biasing portion 30 ′ shown in FIG. 5, the upper end portion 34 a of the torsion spring 34 is fixed to, for example, the shaft 33 or a member fixed to the shaft 33.

Hereinafter, the urging operation of the bidirectional urging unit 30 will be described.
6A and 6B are a side view and a plan view showing the two-way urging portion 30 in a state where the torsion spring 34 and the cam 35 are removed.

  When the fixed end portion 31 of the bracket 31 shown in FIGS. 6A and 6B is fixed to the fixed fin portion 10 by the bracket fixing screw 32, the compression spring 36 is in a compressed state.

  Therefore, the compression spring 36 urges the roller 38 disposed below the compression spring 36 in the first urging direction (arrow D1) vertically downward. Since the two-way urging portion 30 is provided at two corners of the movable fin portion 20, the inclined surface 20 d contacts the tapered portion 38 c of the roller 38 of each two-way urging portion 30, so that the movable fin portion 20. Is urged toward the component 101 in the first urging direction (arrow D1).

  The roller 38 also functions to rotate in contact with the movable fin portion 20 when the movable fin portion 20 moves while being biased toward the fixed fin portion 10 by the torsion spring 34 and the cam 35.

FIGS. 7A to 7C are a side view, a plan view before urging, and a plan view after urging, of the bi-directional urging portion 30 with the compression spring 36 and the roller 38 removed.
When the fixed end portion 31 of the bracket 31 shown in FIGS. 7A to 7C is fixed to the fixed fin portion 10 by the bracket fixing screw 32, the pressing pin 35a of the cam 35 is compressed by the torsion spring 34 in the rotational direction. In this state, it is inserted into the cam recess 20e.

  The torsion spring 34 is fixed by inserting an upper end 34 a into a spring receiving hole 31 d of the bracket 31. Therefore, the torsion spring 34 biases the cam 35 in the rotational direction at the lower end 34b. The pressing pin 35 a of the cam 35 biased in this way presses the side wall of the cam recess 20 e of the movable fin portion 20.

  By the two cams 35 rotating in opposite directions as described above, the movable fin portion 20 is moved toward the side wall of the movable fin receiving hole 10b of the fixed fin portion 10 in the second urging direction (arrow D2) shown in FIG. 7C. ). Thereby, as shown in FIG.1 and FIG.2A, the movable fin part 20 is surface-contacted with two mutually adjacent surfaces of the side wall of the movable fin accommodating hole 10b of the fixed fin part 10. FIG.

8A and 8B are a front view and a plan view of the movable fin portion 20 and the two-way biasing portion 30 for explaining the biasing force of the two-way biasing portion 20.
The biasing force (2 × F1) applied in the first downward biasing direction (arrow D1) by the two two-way biasing portions 30 is expressed by the following equation (1) when the movable fin portion 20 is moved. Satisfy the relationship.

2 × F1> f2 (= μ2 × n2) −mg Formula (1)

  Here, “f2” is a force that resists vertical movement due to contact between the movable fin portion 20 and the fixed fin portion 10, and “μ2” is a friction coefficient of the contact surface between the movable fin portion 20 and the fixed fin portion 10. It is. “N2” is the force that the movable fin portion 20 applies to the fixed fin portion 10 in the horizontal direction, and “mg” is the gravitational mass of the movable fin portion 20.

Further, the urging force (2 × F2) applied in the second urging direction (arrow D2) in the horizontal direction by the two two-way urging units 30 is expressed by the following formula ( The relationship of 2) is satisfied.

2 × F2> f1 (= μ1 × n1) (2)

  Here, “f1” is a force that resists horizontal movement due to contact between the movable fin portion 20 and the component 101, and “μ1” is a friction coefficient of the contact surface between the movable fin portion 20 and the component 101. “N1” is a force that the movable fin portion 20 applies to the component 101 vertically downward.

  When the relationship of the above formulas (1) and (2) is not satisfied, a surface with good slidability is provided on the movable fin portion 20, the fixed fin portion 10 and the like in order to reduce the friction coefficients μ1 and μ2 of the contact surface. It is preferable to perform the treatment.

  In the above description, the fixed fin portion 10 has been described as an example of the base portion. However, as shown in FIG. 9, a block-shaped fixed heat radiating portion 10 ′ having no fins may be used. As for the movable fin portion 20, a block-shaped heat radiating portion having no fins may be used.

  Furthermore, a gas or liquid channel may be provided inside the fixed heat radiating section (fixed fin section 10) and the movable heat radiating section (movable fin section 20) to forcibly radiate heat.

FIG. 10A is a perspective view showing the heat dissipation device 1 and the substrate unit 100. FIG. 10B is an enlarged view of a portion B in FIG. 10A.
The heat radiating device 1 illustrated in FIG. 10A includes only one movable fin portion 20 illustrated in FIG. 10B. The movable fin portion 20 is biased toward the component 101 and the fixed fin portion 10 by the above-described two-way biasing portion 30 (not shown in FIGS. 10A and 10B).

FIG. 11 is a perspective view showing the fin unit 20 ′ and the substrate unit 100 according to the comparative example.
In the board unit 100 shown in FIG. 11, a fin portion 20 ′ is arranged for each component 101.

FIG. 12 is a graph showing the temperature distribution of the embodiment and the comparative example.
In the graph of FIG. 12, the simulation result of the temperature distribution on the surface of the substrate unit 100 (component 101) of the solid line C1 passing through the movable fin portion 20 shown in FIG. 10A and the broken line C2 passing through the fin portion 20 ′ shown in FIG. Is represented.

  The ambient temperature is 45 [° C.]. The temperature of the surface portion of the component 101 in the solid line C1 according to the embodiment is 68.3 [° C.]. The temperature at the surface portion of the component 101 in the broken line C2 according to the comparative example is 72.1 [° C.].

  The temperature rise from the ambient temperature in the surface portion of the component 101 was about 14% lower than that of the fin portion 20 ′ (broken line C2) in the movable fin portion 20 (solid line C1). This is because in the embodiment, the heat conducted from the component 101 to the movable fin portion 20 is further conducted to the fixed fin portion 10 and the heat radiation proceeds.

  As described above, in the embodiment, the heat of the movable fin portion 20 is conducted to the fixed fin portion 10, and therefore, the temperature of the solid line C1 according to the embodiment is the broken line according to the comparative example at four points around the component 101. It is higher than the temperature of C2.

  In the present embodiment described above, the heat radiating device 1 includes the first urging mechanism (the compression spring 36 and the roller 38) that urges the movable fin portion (movable heat radiating portion) 20 toward the substrate unit (heating element) 100. ). The heat radiating device 1 also includes a second urging mechanism that urges the movable fin portion 20 toward the fixed fin portion (base portion) 10 in a direction different from the urging direction of the first urging mechanism. A torsion spring 34 and a cam 35).

  As a result, the movable fin portion 20 is independently biased toward the component 101 and the fixed fin portion 20, so that a spacer or the like is unnecessary, and the movable fin portion 20 is brought into close contact with the component 101 and the fixed fin portion 20. Adjustment is not necessary. Further, the heat conducted from the component 101 to the movable fin portion 20 can be conducted to the fixed fin portion 10 and the board unit 100.

  Therefore, according to the heat radiating device 1 which concerns on this Embodiment, the adjustment operation | work at the time of attachment can be simplified, and the thermal radiation efficiency of a heat generating body (board | substrate unit 100) can be improved. Furthermore, since the movable fin portion 20 and the component 101 of the board unit 100 are in close contact with each other, it is not always necessary to dispose a thermal bonding material between the movable fin portion 20 and the component 101. Therefore, when the thermal bonding material is omitted, generation of thermal resistance due to the thermal bonding material can be prevented, and the heat dissipation device 1 can have a simple configuration.

  In the present embodiment, the movable fin portion 20 is movably connected to the fixed fin portion 10. Therefore, a space for fixing the movable fin portion 20 to the substrate unit 100 can be omitted, and thus a space such as a wiring area of the substrate unit 100 can be secured.

  In the present embodiment, the heat dissipation device 1 includes a plurality of movable fin portions 20 and a plurality of second urging mechanisms (torsion) that urge the separate movable fin portions 20 toward the single fixed fin portion 10. Spring 34 and cam 35). Therefore, the heat dissipation efficiency of the plurality of movable fin portions 20 can be increased by the single fixed fin portion 10. Furthermore, it is possible to prevent the substrate unit 100 from warping.

  In the present embodiment, the plurality of movable fin portions 20 are connected to a single fixed fin portion 10 so as to be movable independently of each other. Therefore, it is possible to further secure a space such as a wiring area of the board unit 100.

  In the present embodiment, the fixed fin portion 10 is formed with a plurality of accommodation holes (movable fin accommodation holes 10b) in which the movable fin portions 20 are accommodated. Therefore, the heat radiation efficiency can be effectively increased by the fixed fin portion 10 while the heat radiation efficiency of the plurality of movable fin portions 20 is enhanced by the single fixed fin portion 10.

  In the present embodiment, the plurality of second urging mechanisms (torsion springs 34 and cams 35) urge the plurality of movable fin portions 20 toward the side walls of the separate movable fin housing holes 10b. Therefore, the heat conducted from the component 101 to the movable fin portion 20 can be conducted from the side wall of the movable fin housing hole 10b to the fixed fin portion 10.

  In the present embodiment, the roller 38 is connected to the fixed fin portion 10 as shown in FIG. 2C, or is connected to the substrate unit 100 as shown in FIG. 5 according to the modification. The roller 38 rotates in contact with the movable fin portion 20 when the movable fin portion 20 moves while being urged toward the fixed fin portion 10 by the second urging mechanism (the torsion spring 34 and the cam 35). To do. Therefore, the friction when the movable fin portion 20 is urged toward the fixed fin portion 10 by the roller 38 can be reduced.

  In the present embodiment, the roller 38 has a taper that decreases in diameter in the first urging direction (arrow D1) toward the substrate unit 100 of the first urging mechanism (the compression spring 36 and the roller 38). A portion 38c is formed. The movable fin portion 20 has an inclined surface 20d that faces the tapered portion 38c. The movable fin portion 20 is urged toward the substrate unit 100 via the tapered portion 38c of the roller 38 by the first urging mechanism (the compression spring 36 and the roller 38) on the inclined surface 20d. Therefore, the movable fin portion 20 can be biased toward the substrate unit 100 without hindering the bias of the movable fin portion 20 toward the fixed fin portion 10.

  In the present embodiment, the first urging mechanism (compression spring 36 and roller 38) and the second urging mechanism (torsion spring 34 and cam 35) urge the movable fin portion 20 in directions orthogonal to each other. To do. Therefore, the movable fin portion 20 can be reliably brought into close contact with the component 101 and the fixed fin portion 10.

  In the present embodiment, the second urging mechanism (the torsion spring 34 and the cam 35) is the first urging direction toward the substrate unit 100 of the first urging mechanism (the compression spring 36 and the roller 38). The movable fin portion 20 is urged in the rotation direction with the arrow D1 as the rotation center. Therefore, the movable fin portion 20 can be biased toward the component 101 and the fixed fin portion 10 with a simple configuration.

  In the present embodiment, the urging center extending in the first urging direction (arrow D1) of the first urging mechanism and the rotation center in the rotational direction that is the urging direction of the second urging mechanism are: They are the same as each other (shaft 33 in this embodiment). Therefore, the movable fin portion 20 can be biased toward the component 101 and the fixed fin portion 10 with a simpler configuration.

  In the present embodiment, the heat radiating device 1 includes at least two second urging mechanisms (torsion spring 34 and cam 35) that urge the single movable fin portion 20 and two second urging mechanisms. Urges the movable fin portion 20 in the opposite rotation directions. Therefore, the movable fin portion 20 can be biased toward the fixed fin portion 10 with a simpler configuration.

  In the present embodiment, as an example of the base portion, a fixed fin portion (fixed heat dissipation portion) 10 made of, for example, metal that radiates heat generated from the substrate unit 100 is used. Therefore, heat can also be actively radiated from the fixed fin portion 10, and the heat radiation efficiency of the substrate unit 100 can be improved.

Regarding the embodiment described above, the following additional notes are further disclosed.
(Appendix 1)
A base portion fixed to the heating element;
A movable heat dissipating part that dissipates heat generated from the heating element;
A first biasing mechanism for biasing the movable heat radiating portion toward the heating element;
A second urging mechanism for urging the movable heat radiating portion toward the base portion in a direction different from the urging direction of the first urging mechanism;
A heat dissipating device comprising:
(Appendix 2)
The heat dissipating device according to claim 1, wherein the movable heat dissipating part is movably connected to the base part.
(Appendix 3)
A plurality of the movable heat dissipating parts;
A plurality of the second urging mechanisms for urging the separate movable heat radiating portions toward the single base portion;
The heat dissipating device according to appendix 1, characterized by comprising:
(Appendix 4)
The heat dissipating device according to claim 3, wherein the plurality of movable heat dissipating parts are connected to the single base part so as to be movable independently of each other.
(Appendix 5)
The heat radiating device according to appendix 3, wherein the base portion is formed with a plurality of housing holes in which the movable heat radiating portions are accommodated.
(Appendix 6)
The heat radiating device according to claim 5, wherein the plurality of second urging mechanisms urge the plurality of movable heat radiating portions toward the side walls of the separate accommodation holes.
(Appendix 7)
A roller connected to the base or the heating element;
The roller rotates in contact with the movable heat radiating portion when the movable heat radiating portion is urged toward the base portion by the second urging mechanism and moves.
The heat radiating device according to Supplementary Note 1, wherein
(Appendix 8)
The roller is formed with a tapered portion that decreases in diameter in the urging direction toward the heating element of the first urging mechanism,
The movable heat radiating portion is formed with an inclined surface facing the tapered portion,
The movable heat radiating portion is urged toward the heating element via the tapered portion of the roller by the first urging mechanism on the inclined surface.
The heat dissipating device according to appendix 7, characterized in that.
(Appendix 9)
The heat radiating device according to claim 1, wherein the first urging mechanism and the second urging mechanism urge the movable heat radiating portion in directions orthogonal to each other.
(Appendix 10)
The second urging imparting mechanism urges the movable heat radiating portion in a rotation direction with the urging direction of the first urging mechanism toward the heating element as a rotation center. 9. A heat dissipation device according to item 9.
(Appendix 11)
The urging center extending in the urging direction of the first urging mechanism and the rotation center in the rotation direction that is the urging direction of the second urging mechanism are the same as each other. Heat dissipation device.
(Appendix 12)
Comprising at least two second urging mechanisms for urging a single movable heat dissipating part;
The two second urging mechanisms urge the movable heat radiating portion in the rotation directions opposite to each other;
Item 11. The heat dissipation device according to appendix 10.
(Appendix 13)
The heat radiating device according to claim 1, wherein the base portion is a fixed heat radiating portion that radiates heat generated from the heating element.

DESCRIPTION OF SYMBOLS 1 Heat radiation apparatus 10 Fixed fin part 10a Fin 10b Movable fin accommodating hole 20 Movable fin part 20a Fin 20b Flange part 20c Through-hole 20d Inclined surface 20e Recessed part for cam 30 Bidirectional urging part 31 Bracket 31a Fixed end part 31b Vertical part 31c Free End portion 31d Spring receiving hole 32 Bracket fixing screw 32 'Shaft fixing screw 33 Shaft 33a Large diameter portion 33b Small diameter portion 34 Torsion spring 34a Upper end portion 34b Lower end portion 35 Cam 35a Pressing pin 35b Spring receiving hole 36 Compression spring 37 Low friction Member 38 Roller 38a Through hole 38b Spring accommodating portion 38c Taper portion 39 Stopper 40 Fixing screw fixing screw 100 Substrate unit 101a Parts

Claims (4)

A base portion fixed to the heating element;
A movable heat dissipating part that dissipates heat generated from the heating element;
A first biasing mechanism for biasing the movable heat radiating portion toward the heating element;
A second urging mechanism for urging the movable heat radiating portion toward the base portion in a direction different from the urging direction of the first urging mechanism;
A heat dissipating device comprising: A plurality of the movable heat dissipating parts;
A plurality of the second urging mechanisms for urging the separate movable heat radiating portions toward the single base portion;
The heat radiating device according to claim 1, comprising: A roller connected to the base or the heating element;
The roller rotates in contact with the movable heat radiating portion when the movable heat radiating portion is urged toward the base portion by the second urging mechanism and moves.
The heat dissipating device according to claim 1. The roller is formed with a tapered portion that decreases in diameter in the urging direction toward the heating element of the first urging mechanism,
The movable heat radiating portion is formed with an inclined surface facing the tapered portion,
The movable heat radiating portion is urged toward the heating element via the tapered portion of the roller by the first urging mechanism on the inclined surface.
The heat dissipating device according to claim 3.