JP6504285B2 - Lighting device - Google Patents

Description

  The present invention relates to a heat dissipating member for diffusing heat generated from a display unit having a heat generating component to the outside, and a lighting device including a heat transfer sheet.

  In the related art, in a lighting device including a heat dissipation member and a heat transfer sheet for diffusing heat generated from a display unit having a heat generating component to the outside, a technique for enabling confirmation of attachment failure of a heat transfer sheet and displacement of a sticking position. Patent Document 1 discloses this.

Unexamined-Japanese-Patent No. 2006-330587

  However, the technique disclosed in Patent Document 1 can confirm the displacement of the sticking position, but there is room for improvement in the assemblability.

  This invention is made in view of the said situation, and an object of this invention is to provide the illuminating device provided with the thermal radiation member with the good attachment property of a heat-transfer sheet.

The lighting device A according to the present invention is
A circuit board 2 having a heat generating component 21, a heat radiating member 1 for dissipating heat generated from the heat generating component 21, and a heat conductive sheet 3 mounted between the heat radiating member 1 and the circuit substrate 2 ,
The heat dissipation member 1 has a mounting groove 11 having a side 110 for specifying the mounting direction of the heat transfer sheet 3;
The heat transfer sheet 3 have a shape corresponding to the side 110 for specifying the mounting direction,
The side 110 for specifying the mounting direction has a convex or concave shape that narrows toward the end.

  ADVANTAGE OF THE INVENTION According to this invention, the illuminating device provided with the thermal radiation member with the good attachment property of a heat-transfer sheet can be provided.

The display unit block diagram of the illuminating device which concerns on embodiment of this invention. The top view and BB sectional drawing of the attachment groove of the thermal radiation member of the illuminating device which concerns on embodiment of this invention. The figure which shows the modification of the attachment groove of the thermal radiation components of the illuminating device which concerns on embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described based on the attached drawings.

  A lighting device A according to the present invention includes a heat dissipation member 1, a display unit 2 on which an LED (heat generating component) 21 is mounted, and a heat transfer sheet 3.

  The heat dissipating member 1 is, for example, a heat sink obtained by die-casting a metal such as aluminum, and is formed with screw holes 10 for screwing the display unit 2 and mounting grooves 11 for mounting the heat transfer sheet 3. There is.

  The heat dissipation member 1, the display unit 2, and the heat transfer sheet 3 have screw holes 10, 20 and 30 respectively corresponding thereto, and after the heat transfer sheet 3 is attached to the mounting groove 11 of the heat dissipation member 1. The display unit 2 is screw-fixed to the heat dissipation member 1 by overlapping the back surface of the surface on which the LED 21 of the display unit is mounted on the heat transfer sheet 3. Thus, the display unit 2 is screwed to the heat dissipation member 1 with the heat transfer sheet 3 interposed therebetween, so that the heat dissipation member 1 and the display unit 2 are in close contact with each other to reduce contact thermal resistance and efficiently dissipate heat. Ru.

  The display unit 2 is, for example, a circuit board on which an LED (Light Emitting Diode) 21 is mounted, and when power is supplied via the flat cable 22, a wiring is formed to illuminate the LED 21.

  The heat transfer sheet 3 is made of a sheet-like resin excellent in heat conductivity and electrical insulation, and when the display unit 2 is fixed to the heat dissipation member 1 with a screw, the heat transfer sheet 3 is interposed between the heat transfer sheets 3 to improve the mutual adhesion. Get the effect.

  As shown in FIG. 2A, the mounting groove 11 of the heat dissipation member 1 is formed with a groove having a guide side 110 whose width becomes narrower toward the end. The heat transfer sheet 3 has a shape corresponding to the guide side 110, and is attached to the mounting groove 11 with the heat transfer sheet 3 along the guide side 110 of the mounting groove 11.

  By configuring in this manner, the heat transfer sheet 3 can be guided by the mounting groove 11 and attached to the heat dissipation member 1 at an appropriate position.

  Further, as shown in FIG. 2 (b), the heat transfer sheet 3 is attached to the guide side 110 by forming the attachment groove 11 of the heat dissipation member 1 as a gently inclined groove in which the groove becomes deeper as it goes to the end. It becomes easy to be guided.

Further, as shown in FIG. 3, the guide side 110 has a symmetrical shape (FIG. 3 (a)) at the center line C whose width becomes narrower toward the end (FIG. 3) or a concave shape symmetrical at the center line C (FIG. 3 (b) or convex shapes symmetrical with respect to the center line C ((c) in FIG. 3) may be modified.
In the shape of FIG. 3, when the heat transfer sheet 3 is placed along the guide side 110, the heat transfer sheet 3 is guided to the center of the guide groove 11.

The above-described lighting device A can be applied to, for example, a liquid crystal lighting device combined with a liquid crystal panel that receives light emitted by the display unit 2 on the back surface and transmits or does not transmit light in pixel units.
In addition, the lighting device A may include a housing that covers the display unit 2 so that a part of the heat dissipation member 1 is exposed, and the display unit 2 may be configured to dissipate the heat generated outside the housing by the heat dissipation member 1

  In the above description, in order to facilitate the understanding of the present invention, the description of the unimportant well-known technical matters is appropriately omitted.

A: Lighting device 1: Heat dissipation member 10: Screw hole 11: Mounting groove 110: Guide side 2: Display unit 20: Screw hole 21: LED (heat-generating component)
22: Flat cable 3: Heat transfer sheet 30: Screw hole C: Center line

Claims (1)

A circuit board having a heat generating component, a heat radiating member for dissipating heat generated from the heat generating component, and a heat transfer sheet mounted between the heat radiating member and the circuit substrate.
The heat dissipation member has a mounting groove having a side that specifies the mounting direction of the heat transfer sheet,
The heat transfer sheet have a shape corresponding to the side for identifying the mounting direction,
The illumination device according to claim 1, wherein the side that specifies the mounting direction has a convex or concave shape that narrows toward the end .

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