JP2007173128A - Luminaire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a luminaire allowing mutual contact pressure among a mounting board, a heat transfer member and a luminaire body to be set adequately high and nearly constant. <P>SOLUTION: This luminaire is provided with a fixing member 4 for elastically catching the mounting board 1, the heat transfer member 3 and the luminaire body 2, while elastically deforming the heat transfer member 3, between a board-side holding part 42a and a body-side holding part 41b connected to each other through a shaft 41a. The mutual contact pressure among the mounting board 1, the heat transfer member 3 and the luminaire body 2 is adequately increased by the elastic force of the heat transfer member 3, and thus a heat radiation property of a light emitting diode LD can be secured. Since the mutual contact pressure among the mounting board 1, the heat transfer member 3 and the luminaire body 2 is determined by the elastic force of the heat transfer member 3, the distance between the board-side holding part 42a and the body-side holding part 41b and the like, dispersion by a worker is not generated and the contact pressure can be set nearly constant. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lighting fixture using a light emitting diode as a light source.

  Conventionally, lighting fixtures using light emitting diodes as light sources have been provided (see, for example, Patent Document 1).

An example of this type of lighting apparatus is shown in FIG. This lighting fixture is sandwiched between a mounting substrate 1 on which a light emitting diode LD is mounted, a fixture body 2 provided with a storage recess 20 in which the mounting substrate 1 is stored, and a bottom surface of the storage recess 20 and the mounting substrate 1. And a heat transfer member 3 for radiating the heat of the light emitting diode LD to the instrument body 2. In order to fix the mounting substrate 1 and the heat transfer member 3 to the instrument main body 2, for example, a plurality of screws (two in the figure) inserted through the mounting substrate 1 and the heat transfer member 3 and screwed into the instrument main body 2. Use SC.
Utility Model Registration No. 3075358

  However, when the screw SC is used, the stress applied to the mounting substrate 1 varies depending on the tightening condition of the screw SC, so that the stress received by the light emitting diode LD from the mounting substrate 1 varies, and thus the light output of the light emitting diode LD varies. It is possible.

  As other methods for fixing the mounting substrate 1 and the heat transfer member 3 to the instrument body 2, there are other methods such as fitting, and projections that engage each other are provided on the outer periphery of the mounting substrate 1 and the inner surface of the housing recess 20, respectively. Although the method can be considered, in any case, it is difficult to obtain the contact pressure of the mounting substrate 1 and the instrument main body 2 with respect to the heat transfer member 3, and thus the heat dissipation is likely to be lowered.

  The present invention has been made in view of the above-mentioned reasons, and an object thereof is to provide a lighting apparatus capable of making the contact pressure between the mounting substrate, the heat transfer member, and the apparatus main body sufficiently high and substantially constant. There is to do.

  Invention of Claim 1 is a lighting fixture provided with the mounting board | substrate with which the light emitting diode was mounted, the instrument main body, and the heat-transfer member pinched | interposed between an instrument main body and a mounting board | substrate, Comprising: At least one of the heat transfer members is an elastic member having elasticity in a direction that changes the dimension in the direction in which the mounting substrate, the instrument main body, and the heat transfer member are overlapped. Each has an insertion hole that communicates with each other, a shaft portion that is inserted into the insertion hole, and a direction that can be inserted into the insertion hole by rotating around the shaft portion that is fixed to one end of the shaft portion. A first holding portion that is either in a non-insertable orientation, or a predetermined fixed portion that is fixed to the other end of the shaft portion and protrudes in the radial direction with respect to the shaft portion so that at least the first pressing portion cannot be inserted into the insertion hole. When it is in the second direction, it cannot be inserted into the insertion hole. A holding part, and sandwiching the mounting board, the heat transfer member, and the instrument main body between the first presser part and the second presser part, so that the mounting board, the instrument main body, and the heat transfer member are elastic. A fixing member is provided for fixing the mounting substrate, the heat transfer member, and the instrument main body to each other while elastically deforming the member.

  According to the present invention, the mounting substrate, the heat transfer member, and the instrument main body are fixed to each other while elastically deforming the elastic member that is one of the mounting board, the heat transfer member, and the instrument main body. It is possible to sufficiently increase the contact pressure between the mounting substrate, the heat transfer member, and the instrument main body, thereby ensuring the heat dissipation of the light emitting diode. In addition, the mutual contact pressure between the mounting substrate, the heat transfer member, and the instrument main body is such that the distance between the first pressing portion and the second pressing portion, the elasticity of the elastic member, and the elastic member being held when it is not deformed. The contact pressure is determined by the distance between the surfaces and does not depend on the work contents of the worker, so that the contact pressure can be made substantially constant.

  According to a second aspect of the present invention, the first presser portion is elastically contacted with a sandwiched surface that is the opposite side of the surface of the instrument body that is elastically contacted with the heat transfer member, and the second presser portion is elastically contacted with the heat transfer member on the mounting substrate. The first pressing portion is in elastic contact with the sandwiched surface that is the opposite side of the surface, and the clamp body of the instrument main body has a first pressing portion when the mounting substrate, the heat transfer member, and the instrument body are fixed to each other. A holding recess to be stored and an inclined portion inclined so as to increase a distance between the insertion hole and the holding surface of the mounting substrate from the insertion hole toward the holding recess are provided, and the insertion hole is formed on the holding surface of the instrument body. The distance between the opening edge on the inclined portion side and the sandwiched surface of the mounting substrate is smaller than the distance between the first presser portion and the second presser portion even when the elastic member is not elastically deformed, The distance between the bottom surface where the first presser portion is elastically contacted with the holding concave portion and the sandwiched surface of the mounting substrate When the elastic member is not elastically deformed, the distance between the first pressing portion and the second pressing portion is larger than the distance between the opening edge on the inclined portion side and the sandwiched surface of the mounting substrate in the holding recess, The difference between the distance between the first presser part and the second presser part is smaller than the change width of the distance between the distanced surfaces due to the elastic deformation of the elastic member.

  According to the present invention, the first presser portion is moved on the sandwiched surface by being inserted through the insertion hole and the fixing member is rotated, and is guided by the inclined portion and introduced into the holding recess. In this case, since the instrument main body, the heat transfer member, and the mounting substrate are fixed to each other, for example, compared to a case where the first pressing portion cannot be moved onto the sandwiched surface unless the elastic member is elastically deformed. Thus, the fixing member can be easily attached.

  According to the present invention, the mounting substrate, the heat transfer member, and the heat transfer member are interposed between the first pressing portion and the second pressing portion while elastically deforming the elastic member that is one of the mounting substrate, the heat transfer member, and the instrument body. Since the appliance main body is sandwiched, the contact pressure between the mounting substrate, the heat transfer member, and the appliance main body can be sufficiently increased by the elastic force of the elastic member, and the heat dissipation of the light emitting diode can be ensured. In addition, the mutual contact pressure between the mounting substrate, the heat transfer member, and the instrument main body is such that the distance between the first pressing portion and the second pressing portion, the elasticity of the elastic member, and the elastic member being held when it is not deformed. The contact pressure is determined by the distance between the surfaces and does not depend on the work contents of the worker, so that the contact pressure can be made substantially constant.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  In the present embodiment, as shown in FIG. 1, a mounting substrate 1 having a flat shape made of, for example, aluminum and having a plurality of light emitting diodes LD mounted on one surface (the lower surface in FIG. 1), and an instrument made of, for example, aluminum. A main body 2 and a heat transfer member 3 made of a material having high thermal conductivity and elasticity and insulation, such as a green sheet, and having a flat shape and sandwiched between the mounting substrate 1 and the instrument main body 2; Is provided. Power is supplied to the light emitting diode LD via, for example, a lead wire (not shown). Hereinafter, the vertical direction will be described with reference to FIG.

  The mounting substrate 1, the instrument body 2, and the heat transfer member 3 are circular when viewed from above and are stacked one above the other, and the thickness direction of the mounting substrate 1 and the heat transfer member 3 is in the vertical direction, respectively. It is aimed. Further, in the mounting substrate 1, the instrument main body 2, and the heat transfer member 3, insertion holes 11, 21, 31 communicating with each other are vertically penetrated at the center when viewed from above. Each insertion hole 11, 21, 31 has a circular wide part 11 a, 21 a, 31 a and a wide part extending in a direction opposite to each other from the wide part 11 a, 21 a, 31 a and having a width dimension in a direction intersecting the extension direction It has a Dharma hole shape having narrow portions 11b, 21b, 31b narrower than 11a, 21a, 31a.

  Moreover, this embodiment is provided with the fixing member 4 for fixing the mounting substrate 1, the instrument main body 2, and the heat transfer member 3 to each other. The fixing member 4 has a shaft portion 41a inserted through the wide portions 11a, 21a, 31a of the insertion holes 11, 21, 31 that are long in the vertical direction, and is fixed to the upper end of the shaft portion 41a and has substantially the same outer diameter as the shaft portion 41a. A cylindrical main body side pressing portion 41b having a radial direction of the shaft portion 41a as an axial direction, and a columnar shape having a diameter that cannot be inserted into the insertion holes 11, 21, 31, and having a central axis common to the shaft portion 41a And a substrate side pressing portion 42a fixed to the lower end of the shaft portion 41a. The fixing member 4 elastically deforms the heat transfer member 3 so as to reduce the thickness dimension, the main body side pressing portion 41b elastically contacts the upper surface of the instrument main body 2, and the substrate side pressing portion 42a contacts the lower surface of the mounting substrate 1. The mounting substrate 1, the instrument main body 2, and the heat transfer member 3 are sandwiched between the main body side pressing portion 41 b and the substrate side pressing portion 42 a so as to be coupled. That is, the upper surface of the instrument body 2 and the lower surface of the mounting substrate 1 are the sandwiched surfaces in the claims. As a material of the fixing member 4, for example, chromium can be used.

  The narrow portions 11b, 21b, 31b of the insertion holes 11, 21, 31 can be inserted through the main body side pressing portion 41b. Further, the upper surface of the instrument body 2 is provided on both sides of the insertion hole 21 at an angle of approximately 90 ° with respect to the narrow portion 21b of the insertion hole 21 and communicates with the insertion hole 21 so that the main body side pressing portion 41b is accommodated. In the state in which the recess 22 is provided and the fixing member 4 combines the instrument main body 2, the heat transfer member 3, and the mounting substrate 1, the main body side pressing portion 41 b is accommodated in the holding recess 22, whereby the instrument main body The rotation of the fixing member 4 with respect to 2 is prohibited. In the instrument body 2, the insertion hole 21 and the holding recess 22 are provided on the bottom surface of a circular recess 23 provided on the upper surface of the instrument body 2.

  The widths of the narrow portions 11b, 21b, 31b, which are parallel to the longitudinal direction and the vertical direction of the narrow portions 11b, 21b, 31b in a state where the instrument body 2, the heat transfer member 3, and the mounting substrate 1 are stacked. FIG. 2 shows a cross-sectional view in a cross section (cross section AA in FIG. 1) passing through the center of the direction. Here, as shown in FIG. 2, when the instrument main body 2, the heat transfer member 3, and the mounting substrate 1 are stacked, the vicinity of the opening of the narrow portion 21 b on the bottom surface of the recess 23 and the narrow portion 11 b on the mounting substrate 1. Even if the heat transfer member 3 is not elastically deformed, the distance to the lower surface is made smaller than the distance between the main body side pressing portion 41b and the substrate side pressing portion 42a. In FIG. 2, the light emitting diode LD is not shown.

  The distance between the bottom surface of the holding recess 22 and the bottom surface of the mounting substrate 1 when the instrument main body 2, the heat transfer member 3 and the mounting substrate 1 are overlapped is the main body when the heat transfer member 3 is not elastically deformed. It is larger than the distance between the side presser 41b and the substrate side presser 42a. Further, when the heat transfer member 3 is not elastically deformed, the difference between the distance between the opening edge of the holding recess 22 and the lower surface of the mounting substrate 1 and the distance between the main body side pressing portion 41b and the substrate side pressing portion 42a is as follows. The heat transfer member 3 has a width that can change the thickness dimension by elastic deformation.

  Furthermore, the opening edge of the insertion hole 21 is between the counterclockwise opening edge of the holding recess 22 when viewed from above and the clockwise opening edge of the narrow portion 21b of the insertion hole 21 when viewed from above. A spiral inclined surface 23 a inclined upward from the opening toward the opening edge of the holding recess 22 is provided. Further, at a position close to the holding recess 22 in the clockwise direction when viewed from above, there is a step 23 b that projects the opening edge of the holding recess 22 upward from the opening edge of the narrow portion 21 b of the insertion hole 21. In addition, it is formed between the end of the recess 23 and the insertion hole 21.

  In this embodiment, in order to connect the mounting substrate 1, the heat transfer member 3, and the instrument body 2 by the fixing member 4, the main body side pressing portion 41 b of the fixing member 4 is connected to the narrow portion 11 b of the insertion holes 11, 21, 31. , 21b, 31b, and the fixing member 4 is rotated clockwise with respect to the instrument body 2 when viewed from above. Then, the main body side pressing portion 41 b slides on the inclined surface 23 a and is introduced into the holding recess 22. Here, the heat transfer member 3 is elastically deformed so as to reduce the thickness dimension, and the contact pressure between the mounting substrate 1, the instrument body 2, and the heat transfer member 3 is obtained by this elastic force. Here, on the lower surface of the substrate-side pressing portion 42a of the fixing member 4, a knob portion 42b that is long in the radial direction of the substrate-side pressing portion 42a is projected so that the fixing member 4 can be rotated even if the knob portion 42b is rotated. Can be rotated.

  According to the above configuration, the heat transfer member 3 is elastically deformed, and the mounting substrate 1, the heat transfer member 3, and the instrument main body 2 are sandwiched between the substrate side pressing portion 42 a and the main body side pressing portion 41 b. The mutual contact pressure of the mounting substrate 1, the heat transfer member 3, and the instrument body 2 can be sufficiently increased by the elastic force of the heat member 3, and the heat dissipation of the light emitting diode LD can be ensured. Further, the mutual contact pressures of the mounting substrate 1, the heat transfer member 3, and the instrument main body 2 are the distance between the substrate side pressing portion 42a and the main body side pressing portion 41b, the mounting substrate 1, the heat transfer member 3, and the instrument main body 2. Therefore, the contact pressure is substantially constant regardless of the work contents of the operator. It can be.

  Here, instead of providing the inclined surface 23 a and the holding recess 22, the distance between the entire bottom surface of the recess 23 and the lower surface of the mounting substrate 1 is set to be larger than the distance between the substrate side pressing portion 42 a and the main body side pressing portion 41 b. Even when the size is increased, the fixture body 2, the heat transfer member 3, and the mounting substrate 1 can be fixed to each other by the fixing member 4. However, in the above case, the main body side pressing portion 41b cannot be moved to the upper side of the instrument body 2 unless the instrument body 2 and the mounting substrate 1 are pressed from above and below and the heat transfer member 3 is elastically deformed. . On the other hand, in this embodiment, by providing the inclined surface 23a and the holding recess 22, the instrument main body can be obtained simply by inserting the main body side pressing portion 41b into the insertion holes 11, 21, 31, and rotating the fixing member 4. 2, the heat transfer member 3, and the mounting substrate 1 are fixed to each other, so that the fixing member 4 can be attached more easily than in the above case.

  The elastic deformation is not limited to the heat transfer member 3, and for example, the instrument body 2 may be elastically deformable so as to change the vertical dimension.

It is a disassembled perspective view which shows embodiment of this invention. It is sectional drawing in the AA cross section of FIG. 1 which shows the state which piled up the instrument main body, the heat-transfer member, and the mounting board | substrate in the same as the above. It is a disassembled perspective view which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mounting board 2 Instrument main body 3 Heat transfer member 4 Fixing member 11, 21, 31 Insertion hole 23a Inclined surface 41a Shaft part 41b Main body side pressing part 42a Substrate side pressing part LD Light emitting diode

Claims (2)

A lighting fixture comprising a mounting substrate on which a light emitting diode is mounted, a fixture body, and a heat transfer member sandwiched between the fixture body and the mounting substrate,
At least one of the mounting substrate, the instrument body, and the heat transfer member is an elastic member having elasticity in a direction that changes the dimension in the direction in which the mounting substrate, the instrument body, and the heat transfer member are overlapped,
The mounting board, the heat transfer member, and the instrument body are provided with insertion holes that communicate with each other,
A shaft portion inserted into the insertion hole, and a direction fixed to one end of the shaft portion and rotated around the shaft portion as a rotation shaft, can be inserted into the insertion hole or in a direction impossible to insert into the insertion hole. 1 presser part and fixed to the other end of the shaft part, projecting in the radial direction with respect to the shaft part, and at least when the first presser part is in a predetermined direction incapable of being inserted into the insertion hole, it cannot be inserted into the insertion hole. A mounting board, a tool body, and a heat transfer member by sandwiching the mounting board, the heat transfer member, and the tool body between the first presser part and the second presser part. And a fixing member that fixes the mounting substrate, the heat transfer member, and the instrument body to each other while elastically deforming the elastic member. The first presser part is in elastic contact with the sandwiched surface that is the opposite side of the surface that contacts the heat transfer member in the instrument body, and the second presser part is the side that is the opposite side of the surface that is in contact with the heat transfer member on the mounting substrate It is elastic in contact with the clamping surface,
The holding surface of the instrument main body includes a holding recess in which the first pressing portion is accommodated when the mounting substrate, the heat transfer member, and the instrument main body are fixed to each other, and the mounting substrate from the insertion hole toward the holding recess. And an inclined portion that is inclined so as to increase the distance between the sandwiched surface,
Even if the elastic member is not elastically deformed, the distance between the opening edge on the inclined portion side of the insertion hole on the clamping surface of the instrument body and the clamping surface of the mounting substrate is the first pressing portion and the second pressing member. Smaller than the distance between the parts,
In the holding recess, the distance between the bottom surface where the first pressing portion elastically contacts and the sandwiched surface of the mounting substrate is larger than the distance between the first pressing portion and the second pressing portion when the elastic member is not elastically deformed. big,
In the holding recess, the difference between the distance between the opening edge on the inclined portion side and the clamped surface of the mounting substrate and the distance between the first pressing portion and the second pressing portion is the distance by elastic deformation of the elastic member. The lighting fixture according to claim 1, wherein the lighting fixture is smaller than a change width of the distance between the surfaces.

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