JP2011150742A - Device for mounting heat-generating component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide "a device for mounting a heat-generating component" wherein the heat-generating component including a light emitting element or the like is positioned on a base material and is fixed thereto together with a heat radiation member. <P>SOLUTION: An optical unit 10 including a light emitting element is mounted on a moving base 2. The heat radiation member 20 is set on the rear side of the optical unit 10 and a holder 30 is fixed to the moving base 2. A supporting portion 36 and an elastic pressing portion 38 of the holder 30 enter a space between the abutting portion 21 and the opposite portion 22 of the heat radiation member 20. When the holder 30 is detached from the moving base 2, the elastic pressing portion 38 is elastically pressed to the abutting portion 21, and the supporting portion 36 is elastically pressed to the opposite portion 22 with reaction force thereof, and the heat radiation member 20 and the holder 30 are handled without detachment. When a fixing portion 31 of the holder 30 is fixed to the moving base 2, the amount of deflection of the elastic pressing portion 38 increases, and the abutting portion 21 is strongly pressed to the optical unit 10. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an attachment device for attaching an exothermic component such as an optical component including a light emitting element or a large-sized IC, and a heat radiating member to a base material.

  When attaching an exothermic part to an electronic device, it is required to provide a heat dissipation member for releasing heat generated from the exothermic part into the atmosphere. The heat radiating member is preferably formed of a metal material having a high thermal conductivity and attached so as to be in close contact with the heat-generating component.

  The exothermic component is an optical component including a light emitting element, a large IC used for a power supply circuit, or the like. An optical pickup device described in Patent Document 1 and Patent Document 2 below receives a light emitting element that irradiates a recording surface of an optical disk such as a CD or a DVD with laser light, and reflected light reflected from the recording surface. An optical unit in which both light receiving elements are housed in the same package is provided. In the optical unit, the light receiving element becomes hot due to the heat generated by the light emitting element, which may affect the light detection accuracy of the light receiving element and the life of the light receiving element. Therefore, it is further necessary to provide the heat dissipation member.

  In the optical pickup device described in Patent Document 1, an optical unit and a heat radiator formed of aluminum or the like are attached to a moving base that moves along the recording surface of an optical disk. The radiator is held by a U-shaped holding spring, and when the holding spring is fixed to the moving base, the radiator is pressed against the back of the optical unit by the elastic force of the holding spring.

  In the optical pickup device described in Patent Document 2, an optical unit including a light emitting element and a light receiving element is attached to a moving base. A heat radiating member formed of aluminum or the like is held from above and below by a holder formed of a metal plate. When the holder is attached to the moving base, the heat radiating member is pressed against the back of the optical unit by a leaf spring formed integrally with the holder.

JP 2008-243324 A JP 2005-135499 A

  The optical pickup device described in Patent Document 1 has a structure in which a heat radiating body is held from above and below by a pressing spring. Since a part of the presser spring is positioned above and below the heat radiating body, the height dimension of the assembly of the presser spring and the heat radiating body is increased, which obstructs the thinning of the optical pickup device. In order to reduce the height dimension, it is necessary to make the upper and lower height dimensions of the heat sink lower than the height dimension of the moving base, and as a result, it is possible to ensure a large heat dissipation area of the heat sink. It becomes difficult.

  In the device described in Patent Document 1, the presser spring and the heat radiating body are integrally combined. However, since the heat radiating body and the optical unit are independent from each other, a positional shift between the heat radiating body and the optical unit occurs. It is easy to reduce the efficiency of heat conduction between the optical unit and the radiator.

  Furthermore, since the heat dissipating body located at the back of the optical unit is covered with the holding spring, it is difficult to adjust the mounting position of the optical unit, and in particular, it is difficult to adjust the position of the optical unit in the rotational direction.

The above problem is the same in the optical pickup device described in Patent Document 2.
The present invention solves the above-described conventional problems, and provides an apparatus for mounting a heat generating component that can attach a heat radiating member and a holder to a base material without being separated from each other and can reduce the height dimension. It is an object.

  It is another object of the present invention to provide an apparatus for mounting a heat generating component that can adjust the mounting positions of the heat dissipating member and the heat generating component together.

The present invention provides a heat generating component attached to the base material with a front portion facing the base material, a heat radiating member that transmits heat of the heat generating component, the heat generating component, and the heat radiating member to the base material. A holder to be attached,
The heat radiating member has a contact portion that contacts the rear portion of the heat-generating component, and a facing portion that faces the rear from the contact portion with a distance therebetween, and the holder is fixed to the base material. A fixing portion; a support portion located between the contact portion and the facing portion of the heat dissipation member; and an elastic pressing portion that extends integrally from the support portion and presses the contact portion forward. And
When the holder is detached from the base material, the elastic pressing part elastically presses the contact part, and the support part is pressed against the opposing part by the reaction force, and the heat radiating member falls off from the holder. When the fixing portion of the holder is fixed to the base material, the contact portion and the heat-generating component are pressed against the base material by the elastic pressing portion. .

  When the holder is detached from the base material, the attachment device of the present invention is combined with the holder and the heat radiating member so that they are difficult to separate from each other. As a result, the heat dissipating member is pressed against the heat generating component, and heat from the heat generating component is transmitted to the heat dissipating member.

  Since the support portion and the elastic pressing portion provided on the holder are disposed between the abutting portion and the facing portion of the heat radiating member, and the holder does not protrude above and below the heat radiating member, the heat radiating member is placed at the height of the base material. Even if it is sufficiently large within the dimensions, the heat radiating member does not protrude from the top and bottom of the base material, and the whole can be easily made thin. Moreover, the heat radiation area of the heat radiation member can be secured sufficiently wide.

  According to the present invention, when the fixing portion of the holder is fixed to the base material, the support portion is moved forward from the facing portion of the heat radiating member, and the deformation amount of the elastic pressing portion is increased. It is preferable that the pressing force of the contact portion and the exothermic component against the base material is increased.

  In this case, the fixing portion of the holder is formed with a mounting hole penetrating in the front-rear direction, which is a direction in which the abutting portion and the facing portion face each other, and a mounting screw is inserted through the mounting hole. Thus, it is preferable that the support portion be separated forward from the facing portion when screwed onto the base material.

  In the above structure, when the fixing portion of the holder is attached to the base material with the attachment screw, the support portion is separated from the facing portion of the heat radiating member, and the deformation amount of the elastic deformation portion is increased.

  According to the present invention, the contact portion between the contact portion of the heat radiating member and the elastic pressing portion of the holder has a convex portion formed on one side and a concave portion formed on the other side, and the displacement is regulated by the concave-convex fitting. Are preferred.

  In the above structure, the holder and the heat dissipation member are positioned relative to each other when the holder is removed from the base material. Therefore, if the holder is fixed to the base material as it is, the heat radiating member can be attached without being displaced with respect to the holder.

  In addition, the heat-generating component can be adjusted in position in the rotational direction with the concavo-convex fitting portion between the contact portion and the elastic pressing portion as a fulcrum.

With the above structure, the position of the heat generating member can be easily adjusted in the rotation direction.
In the present invention, it is preferable that the contact portion of the heat radiating member has a holding portion for holding the heat-generating component, and the heat-generating component is held by the contact portion.

  In this case, it is possible to adjust the position in the rotational direction of the heat radiating member and the heat-generating component together with the concave-convex fitting portion as a fulcrum.

  By holding the heat-generating component with the heat-dissipating member, it is possible to prevent displacement of the heat-dissipating member and the heat-generating component, ensuring a sufficient contact area between the heat-dissipating member and the heat-generating component, and increasing the heat conductivity. It is possible. It is also possible to adjust the position by rotating the heat dissipating member and the heat-generating component together.

  In the present invention, for example, the base material is a moving base of an optical pickup device, the exothermic component has a light emitting element, and light is emitted forward with respect to the base material.

  In the present invention, the heat-generating component may be an optical component on which a light-emitting element for optical communication is mounted, or a large-sized IC that generates a large amount of heat.

  The heat generating component mounting apparatus of the present invention is combined so that the holder and the heat dissipating member do not separate when the holder is removed from the base material, and the two members can be attached to the base material as they are.

  Since the holder support portion and the elastic pressing portion are inserted between the contact portion and the facing portion of the heat dissipation member, the height of the heat dissipation member can be made larger than that of the holder. A large area can be secured, and the entire device can be easily made thin because the holder does not protrude greatly.

FIG. 3 is an exploded perspective view of an optical pickup device provided with a heat generating component mounting device according to the present invention; An exploded perspective view showing a heat-generating component, a heat dissipation member and a holder, A partial plan view showing a state in which a heat generating component, a heat radiating member, and a holder are attached to a moving base as a base material, including a partial cross section A bottom view showing the combined state of the holder and the heat dissipating member with the holder removed,

  The optical pickup device 1 shown in FIG. 1 is provided with a moving base 2 molded from a synthetic resin material or an aluminum alloy as a base material. The moving base 2 is a moving direction in which the X1-X2 direction moves along the recording surface of the optical disc. The Y1 direction is the front direction, which is the mounting direction of the optical unit 10 as the heat-generating component, and the Y2 direction is the rear direction. The Z1 direction is the upward direction, and the Z2 direction is the downward direction.

  The moving base 2 is provided with a reference bearing hole 2a in the front (Y1 direction) and a guide recess 2b in the rear (Y2 direction). A mechanism base of the optical disc device is provided with a pair of guide shafts provided in parallel to each other. Since the reference bearing hole 2a is inserted into one guide shaft and the guide recess 2b is slidably fitted to the other guide shaft, the moving base 2 can be automatically moved along the guide shaft in the X1-X2 direction. is there.

  The mechanism base is provided with a rotational drive means comprising a spindle motor and a turntable that is rotationally driven by the spindle motor. The mechanism base is a reproduction-only or recording-only or recording such as a CD, DVD or Blu-ray Disc (registered trademark). The center hole of the optical disc that can be played is clamped to the turntable. The mechanism base is provided with a thread mechanism, and the movement base 2 is moved in the X1-X2 direction by the thread mechanism.

  The movable base 2 is provided with a movable part 3, and an objective lens 3 a is held on the upper surface of the movable part 3. The movable portion 3 is supported on the moving base 2 by an elastic support member such as a leaf spring or a wire spring so as to be movable in the focusing direction (Z1-Z2 direction) and the tracking direction (X1-X2 direction). A tracking coil 4 is attached to the movable portion 3 on the surface on the Y1 side and the surface on the Y2 side, and a focusing coil (not shown) is wound around the movable portion 3. A pair of magnets 5, 5 are fixed to the moving base 2, and each magnet 5 faces the tracking coil 4 and the focusing coil.

  When the tracking coil 4 is energized, the movable portion 3 is corrected and driven in the tracking direction (X1-X2) direction. When the focusing coil is energized, the movable portion 3 is corrected and driven in the focusing direction (Z1-Z2 direction). Is done.

  A mounting hole 6 in which the optical unit 10 is mounted is opened on the end surface 2c on the Y2 side of the moving base 2, and an optical path 7 is formed in the back of the mounting hole 6. The optical unit 10 has a light emitting element and a light receiving element. The light emitted from the light emitting element is given to the light path 7, reflected upward by the reflecting surface provided inside the light path 7, and given to the objective lens 3a. The reflected light reflected from the recording surface of the optical disk returns to the optical path 7 through the objective lens 3 a and the reflecting surface, and is received by the light receiving element in the optical unit 10.

  The moving base 2 has a fixed surface 2d positioned on the Y2 side of the end surface 2c, and a female screw hole 2e is formed in the fixed surface 2d. An auxiliary fixing surface 2f is formed on the upper surface of the moving base 2, and a female screw hole 2g is formed. On the Y1 side and the Y2 side of the auxiliary fixing surface 2f, three support surfaces 2h are formed at one step lower position, and one step lower support surface 2i is formed on the X1 side.

  The optical unit 10 is called a hologram unit. As shown in FIG. 2, the optical unit 10 has a substrate 11. An optical case 12 is provided on the front portion 11 a of the substrate 11, and a hologram 13 is provided in front of the optical case 12. The optical case 12 houses a light emitting diode that is a light emitting element, a photodiode that is a light receiving element that receives a recording signal, a focusing error signal, and a tracking error signal of an optical disc, a beam splitter, and the like. On both sides of the substrate 11, a terminal group 14 that conducts to the light emitting element and the light receiving element is provided so as to protrude.

  Positioning projections 15 and 15 located on both sides of the optical case 12 are provided on the front portion 11a of the substrate 11 of the optical unit 10, and the outer peripheral surfaces of the positioning projections 15 and 15 are positioning curved surfaces 15a and 15a. . The positioning curved surfaces 15a and 15a are part of a cylindrical surface centered on the optical axis of light emission and light reception of the optical case 12.

  As shown in FIG. 1, the inner surface of the mounting hole 6 constitutes a part of a cylindrical surface having substantially the same curvature as the positioning curved surfaces 15a and 15a. When the optical case 12 and the positioning protrusions 15 and 15 of the optical unit 10 are inserted into the mounting hole 6, the positioning curved surfaces 15a and 15a are fitted into the inner surface of the mounting hole 6, and the optical unit 10 is X1-X2. Is positioned so as not to move in the direction and the Z1-Z2 direction. Further, the front portion 11a of the substrate 11 is positioned in the front-rear direction (Y1-Y2 direction) by contacting the end surface 2c of the moving base 2. When the optical unit 10 is rotated around an axis extending in the Y1-Y2 direction (an axis substantially coinciding with the optical axis), the positioning curved surfaces 15a and 15a slide on the inner peripheral surface of the mounting hole 6 to center the optical axis. It is possible to adjust the mounting orientation of the optical unit 10 in the rotational direction.

  As shown in FIG. 2, the mounting device for mounting the optical unit 10 that is a heat generating component to the moving base 2 that is a base material includes the optical unit 10, a heat radiating member 20, and a holder 30. .

  The heat radiating member 20 is formed by bending a metal plate such as an aluminum plate or a steel plate. The holder 30 is formed by bending with a spring metal plate such as a stainless steel plate. Although the heat radiating member 20 and the holder 30 may be formed of the same metal material, the heat radiating member 20 is preferably formed of a metal material having a higher thermal conductivity than the holder 30.

  The heat dissipating member 20 has a metal plate bent in a U shape, a contact portion 21 on the Y1 side, a facing portion 22 on the Y2 side, and a space in the front-rear direction (Y1-Y2 direction). A connecting portion 23 is provided on the upper side. A surface facing the front (Y1 direction) of the contact portion 21 is a contact surface 21a, and the contact surface 21a contacts the rear portion 11b which is a heat dissipation surface of the substrate 11 of the optical unit 10.

  As shown in FIG. 2, a holding claw 21 b bent toward the front (Y1 direction) is integrally formed at the lower end of the contact portion 21 of the heat radiating member 20, and the connecting portion 23 has the contact portion 21 of the contact portion 21. A pair of holding claws 23a, 23a projecting forward (Y1 direction) from the contact surface 21a is formed. With the abutment surface 21a of the abutment portion 21 abutting against the rear portion 11b of the substrate 11 of the optical unit 10, the holding claw 21b and the holding claw 23a, 23a are in a state where there is almost no gap from above and below. The optical unit 10 and the heat radiating member 20 are positioned without moving up and down.

  As shown in FIGS. 2 and 3, the contact portion 21 of the heat radiating member 20 is formed with a raised portion 21d protruding rearward from the rear surface 21c, and the rear surface 21c is surrounded by the raised portion 21d. A concave portion 21e is formed.

  As shown in FIG. 1, the holder 30 is provided with a fixing portion 31 formed in parallel with the XZ plane, and an attachment hole 31 a is formed in the fixing portion 31. In the holder 30, an extension portion 32 parallel to the XY plane is bent at a right angle from the fixed portion 31. The extension portion 32 is provided with three support leg portions 33 and one support leg portion 34 that are bent downward. An auxiliary fixing portion 35 is provided at a position one step lower than the extension portion 32 at the end of the holder 30 on the X2 side, and an auxiliary fixing hole 35a is opened in the auxiliary fixing portion 35. The auxiliary fixing hole 35a is a long hole long in the Y1-Y2 direction.

  The holder 30 is integrally provided with a support portion 36 located on the Y2 side with respect to the fixed portion 31, and an elongated hole 37 is opened in the support portion 36. An elastic arm extending in the Y1 direction from the X2 side edge of the long hole 37 is integrally formed as an elastic pressing portion 38. The elastic pressing portion 38 can be elastically deformed by bending in the Y1-Y2 direction. As shown in FIG. 3, a convex portion 38 a that protrudes forward (Y1 direction) is formed at the tip of the elastic pressing portion 38.

  An attachment method for attaching the optical unit 10 and the heat radiating member 20 to the moving base 2 using the attachment device will be described.

  FIG. 4 shows a state before the holder 30 is attached to the movable base 2, and shows a state where the holder 30 is viewed from below. The support portion 36 and the elastic pressing portion 38 of the holder 30 enter between the contact portion 21 and the facing portion 22 of the heat radiating member 20. When the convex portion 38 a at the front portion of the elastic pressing portion 38 is fitted into the concave portion 21 e formed on the rear surface 21 c of the abutting portion 21 of the heat radiating member 20, the elastic pressing portion 38 becomes the abutting portion 21 of the radiating member 20. The support portion 36 of the holder 30 presses the facing portion 22 of the heat radiating member 20 in the Y2 direction by the reaction force. Therefore, when the holder 30 is detached from the moving base 2, the heat radiating member 20 and the holder 30 are fitted by an elastic force and are not easily separated. Further, the convex portion 38 a at the tip of the elastic pressing portion 38 and the concave portion 21 e of the contact portion 21 are fitted, so that the tip portion of the elastic pressing portion 38 is aligned with the center portion of the contact portion 21. In the state, the heat dissipation member 20 and the holder 3 are connected so as not to be separated from each other.

  As shown in FIG. 3, after inserting the positioning protrusions 15, 15 of the optical unit 10 into the mounting hole 6 of the moving base 2, the fixing portion 31 of the holder 30 is installed on the fixed surface 2 d of the moving base 2. At this time, the lower surfaces of the three support legs 33 of the holder 30 are installed on the three support surfaces 2h of the moving base 2, and the lower surfaces of the support legs 34 are installed on the support surface 2i. Then, when the mounting screw 41 is inserted into the mounting hole 31 a of the holder 30 and screwed into the female screw hole 2 e of the moving base 2 and tightened, the fixing portion 31 of the holder 30 is attached to the moving base 2 as shown in FIG. It is in close contact with the fixed surface 2d. Before and after that, the mounting screw 42 is inserted into the auxiliary fixing hole 35 a of the auxiliary fixing portion 35 of the holder 30 and screwed into the female screw hole 2 g formed in the moving base 2. Thereby, the holder 30 is completely fixed to the moving base 2.

  As shown in FIG. 3, since the holder 30 fixed to the moving base 2 is in close contact with the fixed surface 2 d of the moving base 2, the support portion 36 that extends integrally from the fixing portion 31 is attached to the moving base 2. It becomes substantially parallel to the end surface 2c, and the support part 36 moves away from the facing part 22 of the heat dissipation member 20 forward. As a result, the amount of bending of the elastic pressing portion 38 increases, the force by which the elastic pressing portion 38 presses the contact portion 21 forward increases, and the contact surface 21 a of the contact portion 21 is formed on the substrate 11 of the optical unit 10. It is strongly pressed against the rear part 11b. Then, the front surface 11 a of the substrate 11 of the optical unit 10 is strongly pressed against the end surface 2 c of the moving base 2. When the contact portion 21 of the heat dissipation member 20 is strongly pressed against the optical unit 10, heat generated from the optical unit 10 is easily transmitted to the heat dissipation member 20.

  The attachment hole 31a of the fixing part 31 of the holder 30 penetrates in the front-rear direction (Y1-Y2 direction) which is the same direction as the bending direction of the elastic pressing part 38, and the attachment screw 41 faces forward (Y1 direction). Inserted and screwed into the female screw hole 2e. By this screwing operation, the fixing portion 31 can be brought into close contact with the fixing surface 2d, and at the same time, the elastic pressing portion 38 can be bent. At this time, since the heat radiation member 20 and the holder 30 are concavo-convexly fitted by the concave portion 21e and the convex portion 38a, the holder 30 is attached to the moving base 2 without being displaced from the heat radiation member 20.

  As shown in FIG. 3, when the optical unit 10 is rotated or the heat dissipation member 20 is rotated while the holder 30 is fixed to the moving base, the holder 30 is held by the heat dissipation member 20 and the holding claws 21b and 21b, 21b. The optical unit 10 is rotated as a unit. At this time, the positioning curved surfaces 15a and 15a of the positioning protrusions 15 and 15 of the optical unit 10 slide on the inner peripheral surface of the holding hole 6 of the moving base 2, and the optical unit 10 rotates about its optical axis. The posture can be changed.

  The optical unit 10 is held by the heat radiating member 20, and the heat radiating member 20 and the holder 30 are repressed only at the concave portion 21e and the convex portion 38a, and this repressive portion is located substantially on the same line as the optical axis. The optical unit 10 and the heat dissipation member 20 can be rotated relatively easily.

  After the rotation adjustment, the heat radiating member 20 and the optical unit 10 are fixed without moving by the strong elastic force of the elastic pressing portion 38. Further, after the rotation adjustment, the optical unit 10 and the moving base 2 may be fixed with an adhesive.

  In the present invention, a concave portion may be formed at the front portion of the elastic pressing portion 38, and a convex portion that fits the concave portion may be formed in the heat radiating member 20.

DESCRIPTION OF SYMBOLS 1 Optical pick-up apparatus 2 Moving base 2c End surface 2d Fixed surface 2e Female screw hole 2f Auxiliary fixed surface 2g Female screw hole 3 Movable part 3a Objective lens 6 Mounting hole 10 Optical unit 11 Substrate 12 Optical case 13 Hologram 15 Positioning protrusion 20 Heat radiation member 21 Contact part 21b, 23a Holding claw 21e Concave part 22 Opposing part 30 Holder 31 Fixing part 31a Mounting hole 36 Support part 38 Elastic pressing part 38a Convex part

Claims (8)

A heat generating component attached to the base material with the front portion directed to the base material, a heat radiating member that transmits heat of the heat generating component, and a holder that attaches the heat generating component and the heat radiating member to the base material. Have
The heat radiating member has a contact portion that contacts the rear portion of the heat-generating component, and a facing portion that faces the rear from the contact portion with a distance therebetween, and the holder is fixed to the base material. A fixing portion; a support portion located between the contact portion and the facing portion of the heat dissipation member; and an elastic pressing portion that extends integrally from the support portion and presses the contact portion forward. And
When the holder is detached from the base material, the elastic pressing part elastically presses the contact part, and the support part is pressed against the opposing part by the reaction force, and the heat radiating member falls off from the holder. When the fixing portion of the holder is fixed to the base material, the contact portion and the heat-generating component are pressed against the base material by the elastic pressing portion.   When the fixing portion of the holder is fixed to the base material, the support portion is moved forward from the facing portion of the heat radiating member, and the deformation amount of the elastic pressing portion increases, and the contact portion and the The mounting apparatus according to claim 1, wherein a pressing force of the heat-generating component to the base material is increased.   The fixing portion of the holder is formed with a mounting hole penetrating in the front-rear direction, which is a direction in which the contact portion and the facing portion face each other, and a mounting screw is inserted through the mounting hole to form the base material. The attachment device according to claim 2, wherein the support portion is moved forward from the facing portion when being screwed to the front.   The contact portion between the contact portion of the heat radiating member and the elastic pressing portion of the holder has a convex portion formed on one side and a concave portion formed on the other side, and positional deviation is regulated by concave and convex fitting. The mounting apparatus according to any one of 1 to 3.   The mounting device according to claim 4, wherein the heat generating component can be adjusted in position in the rotational direction with a concave / convex fitting portion between the contact portion and the elastic pressing portion as a fulcrum.   The said contact part of the said heat radiating member has a holding part holding the said exothermic component, The said exothermic component is hold | maintained at the said contact part. Mounting equipment.   The contact portion of the heat radiating member has a holding portion that holds the heat-generating component, and the heat-generating component is held by the contact portion so that the heat-dissipating member and the heat-generating component are combined together. 6. The attachment device according to claim 5, wherein the position of the concave-convex fitting portion as a fulcrum can be adjusted in the rotational direction.   The said base material is a movement base of an optical pick-up apparatus, the said exothermic component has a light emitting element, Light is emitted toward the front with respect to the said base material. The mounting device described in 1.

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