JP2009110821A - Light emitting device and lighting fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To fix a heat radiating board to a lighting fixture by uniform force by a lens fixing holder, in a light emitting device having the lens fixing holder and the heat radiating board. <P>SOLUTION: This light emitting device has the heat radiating board 4 superior in heat radiating performance on the back face side of a light source, a light distribution control lens 3 and the lens fixing holder 2 on the front side of the light source, by using an LED for the light source 6. An installation hole 11 of the heat radiating board is a semicircular shape, and a peripheral edge part of this hole can be coveted with an installation piece of the lens fixing holder. The installation piece of the lens fixing holder is provided with a circular hole 22 opposed to the installation hole 11 of the heat radiating board in the vicinity of a tip part, and a projection part 12 is formed in the tip part so as to be opposed to a lower heat radiating board side surface. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a light-emitting device using a light-emitting element and an illumination lamp to which the light-emitting device is attached, and more particularly to a light-emitting device mounting structure.

  As a light-emitting device using a light-emitting element, there is an apparatus having a structure in which a light-emitting element is mounted on a heat dissipation substrate and the heat dissipation substrate is attached to an illumination lamp by screwing. In a conventional light emitting device having this type of structure, for example, as shown in Patent Document 1, a screw hole of a heat dissipation board has a semicircular shape.

  However, when the screw holes on the heat dissipation board are semicircular as described above, when the light emitting device is screwed to the lighting fixture, the heat dissipation board only contacts about half of the screw head, so the heat dissipation board should be uniform. There is a problem that can not be fixed with strong force. Further, since the screws are not stable, there is a problem that the screw tightening operation is difficult.

When using a lens fixing holder that surrounds the light emitting element, if the lens fixing holder is fixed to the heat dissipation substrate with an adhesive, the adhesive protrudes outside the lens fixing holder, resulting in poor appearance of the light emitting device. There is a problem of becoming.
Japanese Patent Laying-Open No. 2006-319111 (FIG. 7)

  The present invention has been made to solve the problems that occur when the light emitting device is attached to the illumination lamp as described above. The heat dissipation substrate of the light emitting device can be fixed to the illumination lamp with a uniform force without using an adhesive. It is an object of the present invention to provide a light emitting device and an illumination lamp that can easily and stably fix the holder of the light emitting device and the heat dissipation substrate to the illumination lamp.

  The light-emitting device of the present invention includes a light source using a light-emitting element, and a heat dissipation substrate in which the light source is placed on a part of the upper surface, and a pair of mounting notches are formed on a part of the peripheral surface. And a holder having a cylindrical portion that is placed on the heat dissipation substrate and surrounds the periphery of the light source, and protrudes from the outer surface of the cylindrical portion of the holder to the sides opposite to each other, and the heat dissipation A pair of attachment pieces having a portion that can be opposed is provided so as to cover the peripheral portion of the notch portion of the substrate, and a circular hole that can face the notch portion is formed in the attachment piece. In addition, a pair of protrusions that can face the outer surface of the notch are provided downward, so that the holes of the pair of attachment pieces and the pair of notches are located on the same line. When the holder is placed on the heat dissipation substrate , Together with the mounting piece covering the peripheral portion of the notch, the protrusion is characterized by comprising a state opposed to the outer surface of the notch.

  It is preferable that the heat dissipation substrate and the holder have a structure for mutual positioning. For example, it is preferable that positioning holes are provided in the heat dissipation substrate, and positioning ribs that can be press-fitted into the holes are provided on the bottom surface of the holder. This facilitates positioning of the heat dissipation board and the holder when the holder and the heat dissipation board are screwed and fixed to the illumination lamp. At this time, when the lens is disposed inside the cylindrical portion of the holder, the positioning of the lens and the light source can be set correctly.

  The holder preferably has a rotationally symmetric structure of 180 ° when viewed from the light emitting direction of the light emitting device. As a result, the light emitting device can be assembled regardless of whether the holder and the lens are rotated in the direction of rotation (around the axis) on either the 0 ° side or the 180 ° side of the arrangement line of the pair of mounting pieces. Therefore, it becomes possible to easily assemble without worrying about the direction of assembly.

  The holder is formed of a flexible synthetic resin that can be deformed by pushing from the side of the cylindrical part when the lens is pushed into the cylindrical part from above, and can hold the lens after the lens is inserted. Is preferred. As a result, the lens can be easily assembled simply by pushing the lens into the holder from above.

  The light source has a structure in which a light emitting element chip is surface-mounted on a package, the lens is disposed above the light source, and the lens is such that the light emitting element chip is positioned inside the lens from the lower surface of the lens. It preferably has a structure. Accordingly, the lens can be effectively used so that light from the light source is efficiently emitted to the front side, and light distribution can be controlled in accordance with a desired illuminance distribution (range).

  In the illumination lamp of the present invention, in the state where the holder of the light emitting device of the present invention is placed on the heat dissipation substrate, the hole of the mounting piece of the holder and the notch portion of the heat dissipation substrate are fixed together by screws. It is characterized by that.

  According to the light emitting device of the present invention, since the peripheral portion of the notch portion of the heat dissipation substrate is covered with the mounting piece of the holder, the heat dissipation substrate can be fixed with a uniform force. In addition, since the holder and the heat dissipation board are fastened together with the illumination lamp, the holder and the heat dissipation board can be easily and stably fixed to the illumination lamp without using an adhesive.

  According to the illumination lamp of the present invention, the assembly is simple and the appearance is beautiful as compared with the case where an adhesive is used when the light emitting device is attached. In addition, since the light-emitting device holder is provided with a press-fit rib, the holder does not come off the heat-dissipating substrate when the light-emitting device is mounted from the lower side (the heat-dissipating substrate side), and the screws can be easily tightened. .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this description, common parts are denoted by common reference numerals throughout the drawings.

<First Embodiment>
FIGS. 1A and 1B are a perspective view and an exploded view schematically showing a first embodiment of a light-emitting device of the present invention. FIG. 1C is a perspective view schematically showing the lens fixing holder in FIG. 1B taken out and viewed from the lower surface side. FIG. 2 is a perspective view showing an assembly process of the light emitting device in FIG.

  FIGS. 3A and 3B are a perspective view and a cross-sectional view schematically showing a part of an illuminating lamp to which the light emitting device of the present invention is attached. 4A and 4B are a cross-sectional view schematically showing an example of a light source in the light-emitting device of FIG. 1 and a cross-sectional view schematically showing an example of an arrangement relationship between the light source and the lens. FIG. 5 is a cross-sectional view schematically showing the path of light emitted from the light source in the light emitting device of FIG. 6A, 6 </ b> B, and 6 </ b> C are cross-sectional views schematically illustrating an example of a heat dissipation board in the light emitting device of FIG. 1, and an example of an attachment piece of the lens fixing holder and an attachment portion of the heat dissipation board. It is sectional drawing and a bottom view showing roughly.

  In the light emitting device 1 of the present embodiment, a light emitting element is used as the light source 6. The light emitting device 1 has a heat dissipation substrate 4 with good thermal conductivity on the back side of the light source 6, and on the front side (outgoing direction side) of the light source 6. Includes a lens 3 for light distribution control and a lens fixing holder 2 for fixing the lens 3. Then, the lens fixing holder 2 and the heat radiating substrate 4 can be fastened and fixed (attached) to the illumination lamp 7 using screws 8.

  The light source 6 has, for example, a structure in which a light emitting diode (LED) chip (die) 9 is surface-mounted on a package 10.

  As the heat radiating substrate 4, for example, a substrate having a good thermal conductivity in which a rectangular corner portion is cut and miniaturized is used, and a wiring pattern and an electrode pattern 42 are formed on the substrate. Here, in the vicinity of the pair of diagonal portions of the heat dissipation substrate 4, a semicircular (or semi-ellipsoidal) hole 11 in which a part of the circular peripheral surface is missing is formed as a notch in this example. In the vicinity of the remaining corner, an electrode pattern 42 for electrically connecting external connection wiring (for example, lead wiring, not shown) is provided in an aggregated manner.

  The lens fixing holder 2 is made of a synthetic resin having high heat resistance such as polycarbonate, and has a cylindrical portion 20 surrounding the light source 6, and the lens 3 can be pushed into the cylindrical portion 20 from above. It has a simple structure. Specifically, the lens fixing holder 2 is deformed by pushing from the side of the cylindrical portion 20 when the lens 3 is inserted into the cylindrical portion 20 from above, and the lens 3 is sandwiched after the lens 3 is inserted. It is preferable that the lens fixing holder 2 and the lens 3 are fixed in a state where they have enough flexibility and are engaged with each other. As a result, the lens 3 can be easily assembled by simply pushing the lens 3 into the lens fixing holder 2 from above.

  It is preferable that the lens 3 in the lens fixing holder 2 has a structure for preventing the lens 3 from rotating and coming off. As an example, a groove (not shown) is partially provided on the outer peripheral surface of the lens 3, and a hook (not shown) that contacts the bottom surface of the groove is provided on the inner surface of the cylindrical portion 20 of the lens fixing holder 2. Yes.

  Further, the lens fixing holder 2 has a pair of mounting pieces 21 projecting from the vicinity of the bottom of the cylindrical portion 20 to the sides opposite to each other, and the pair of mounting pieces 21 is the same as the pair of diagonal portions of the heat dissipation board 4 It has a size that can be placed on the heat dissipation substrate 4 in a state of being located on the line. In this case, it is preferable that the heat dissipation substrate 4 and the lens fixing holder 2 have a structure for performing mutual positioning. For example, it is preferable that a positioning hole 13 is provided in the heat dissipation substrate 4 and a positioning rib 14 that can be press-fitted into the above 13 is provided on the bottom surface of the lens fixing holder 2. This makes it possible to correctly set the positioning of the lens 3 and the light source 6, and facilitates the positioning of the heat dissipation board 4 and the holder 2 when the holder 2 and the heat dissipation board 4 are screwed and fixed to the lighting fixture 7. .

  The pair of attachment pieces 21 cover the periphery of the semicircular hole 11 of the heat dissipation board 4 in the vicinity of the protruding tip of the attachment piece 21 when the lens fixing holder 2 is placed on the heat dissipation board 4. A circular hole 22 that can be opposed to the semicircular hole 11 of the heat dissipation substrate 4 is provided in the vicinity of each protruding tip.

  Furthermore, a pair of protrusions that can be opposed to the outer surfaces of the pair of diagonal portions of the heat dissipation substrate 4 when the lens fixing holder 2 is placed on the heat dissipation substrate 4 at the protruding tips of the pair of mounting pieces 21. The part 12 protrudes downward. An example of the protrusion 12 preferably has an arc-shaped inner surface that can be opposed along the outer surface of the corner of the heat dissipation substrate 4. Thereby, a light-emitting device can be made small. Further, since the gap with the screw can be reduced, there is an advantage that the screw tightening can be further facilitated.

  The lens 3 is made of a resin such as acrylic having a high light transmittance, and is disposed above the light source 6 inside the lens fixing holder 2. When the light source 6 having a structure in which the LED chip 9 is surface-mounted on the package 10 is used, the lens 3 has a structure in which the LED chip 9 is positioned on the front side in the irradiation direction and inside the lens from the lower surface of the lens ( For example, it is preferable to have a shape in which the tip of the inverted conical shape is recessed. As a result, the light from the light source 6 is effectively utilized by the lens 3 so as to be efficiently guided forward, and the light emitted from the side surface of the LED chip 9 is also efficiently guided forward, and is distributed in accordance with a desired illuminance distribution (range). Light control becomes possible.

  The lens fixing holder 2 and the lens 3 preferably have a rotationally symmetric structure of 180 ° when viewed from the light emitting direction of the light emitting device. As a result, the light emitting device is assembled regardless of whether the direction of the rotation direction (axial direction) of the lens fixing holder 2 and the lens 3 is 0 ° or 180 ° with respect to the arrangement line of the pair of mounting pieces. Therefore, it is possible to easily assemble without worrying about the direction of assembly.

  Further, the material of the heat dissipation substrate 4 and the lens fixing holder 2 is preferably black in order to prevent stray light emitted from the light source 6.

  On the other hand, the illumination lamp 7 can place the heat dissipation board 4 on a part of its upper surface, and when the heat dissipation board 4 is placed, it can be placed at a position that can face the holes 22 of the pair of mounting pieces 21 of the lens fixing holder 2. A pair of screw holes is provided.

  According to such a configuration, the screw 8 is screwed into the screw hole of the illumination lamp 7 from the hole 22 of the pair of mounting pieces 21 of the lens fixing holder 2 through the semicircular hole 11 of the heat dissipation board 4. The lens fixing holder 2 and the heat dissipation substrate 4 of the light emitting device 1 can be screwed and fixed to the illumination lamp 7.

  When screwing and fixing in this way, the periphery of the semicircular hole 11 of the heat dissipation board 4 is covered by the vicinity of the tip of the pair of mounting pieces 21 of the lens fixing holder 2, so that the heat dissipation board 4 can be applied with uniform force. It is possible to alleviate the application of excessive stress to the heat dissipation board 4.

  In addition, since the heat dissipation board 4 is fixed with a uniform force in the screw-fastened state, the adhesion between the heat dissipation board 4 and the lighting fixture 7 is good, and heat is efficiently transferred from the heat dissipation substrate 4 to the lighting fixture 7. I can escape.

  In addition, since the hole 22 provided in the vicinity of the tip of the pair of mounting pieces 21 of the lens fixing holder 2 is circular, it is stabilized so as to prevent the screw 8 from falling down when screwing and fixing. This makes it easy to attach the light emitting device 1 to the illumination lamp 7.

  In addition, since the protrusion 12 is provided at the tip of the pair of mounting pieces 21 of the lens fixing holder 2, it is possible to prevent excessive stress from being applied to the lens fixing holder 2 when external pressure is applied during screw fastening. Can be relaxed.

Note that the heat dissipation substrate 4 is preferably made of a metal such as aluminum (Al) or copper (Au) having a good thermal conductivity. The thermal expansion coefficient of such a metal is about 2.32 × 10 ⁻⁵ / ° C., and the thermal expansion coefficient of a resin such as polycarbonate (PC) used for the lens fixing holder 2 is about 6.5 × 10 ⁻⁵ / ° C. Yes, the thermal expansion coefficient of the heat dissipation board 4 and the lens fixing holder 2 is about 3 times different. Thus, although the thermal expansion coefficients of the two are different, there is a gap in the portion where the pair of protrusions 12 of the lens fixing holder 2 and the semicircular hole 11 of the heat dissipation substrate 4 face each other ( In other words, since the protrusion 12 and the semicircular hole 11 are separated from each other), it is possible to avoid applying extra stress to the lens fixing holder 2 due to thermal expansion.

  In the above embodiment, the heat dissipation substrate 4 has a shape in which one corner of a square is cut. However, the shape is not limited to this shape. For example, a pair of mounting cutouts is formed on a part of the peripheral surface of a circular substrate. You may use the thermal radiation board | substrate with which the part opposed was formed.

  In the above embodiment, the lens fixing holder 2 in which the lens 3 is disposed is used. However, a holder in which the lens 3 is not disposed may be used.

  An assembly process of the light emitting device and the illumination lamp according to one embodiment of the present invention will be described with reference to FIG. First, the light source 6 is mounted on the heat dissipation board 4. On the other hand, the lens 3 is pushed in from above the lens fixing holder 2. Next, the positioning rib 14 of the lens fixing holder 2 is press-fitted into the hole 13 of the heat dissipation board 4 and fixed.

  The lens fixing holder 2 and the heat radiating substrate 4 of the light emitting device 1 obtained in this way are tightened together with the illumination lamp 7 with screws 8 as shown in FIG. Can be fixed with force.

  The present invention is not limited to the above-described embodiments and examples, and various modifications are possible within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say.

  The present invention can be used for general illumination lamps and special illumination lamps.

1 is a perspective view and an exploded view schematically showing a first embodiment of a light emitting device of the present invention, and a perspective view schematically showing a lens fixing holder taken out from the lower surface side. The perspective view which shows the assembly process of the light-emitting device of FIG. The perspective view and sectional drawing which show schematically some illumination lamps which attached the light-emitting device of this invention. Sectional drawing which shows schematically an example of the light source in the light-emitting device of FIG. 1, and sectional drawing which shows schematically an example of the arrangement | positioning relationship between a light source and a lens. Sectional drawing which shows schematically the course of the light ray emitted from the light source in the light-emitting device of FIG. Sectional drawing which shows schematically an example of the heat sink in the light-emitting device of FIG. 1, and sectional drawing and bottom view which show schematically an example of the attachment part of a lens fixing holder, and the attachment part of a heat sink.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Light-emitting device, 2 ... Lens fixing holder, 3 ... Lens, 4 ... Heat dissipation board, 6 ... Light source, 7 ... Illumination lamp, 8 ... Screw, 9 ... LED chip, 10 ... Package, 11 ... Hole for heat dissipation board installation , 12 ... protrusions, 13 ... positioning holes, 14 ... positioning ribs, 20 ... cylindrical parts, 21 ... mounting pieces, 22 ... holes in the mounting pieces, 42 ... electrode patterns.

Claims (7)

A light source using a light emitting element;
The light source is placed on a part of the upper surface, and a heat dissipating substrate formed with a pair of mounting cutouts facing each other on a part of the peripheral surface,
A holder placed on the heat dissipation substrate and having a cylindrical portion surrounding the light source;
Comprising
A pair of attachment pieces are provided that protrude from the outer surface of the cylindrical portion of the holder to the sides opposite to each other and have portions that can be opposed to cover the peripheral portion of the cutout portion of the heat dissipation substrate,
The mounting piece is formed with a circular hole that can face the notch and a pair of protrusions that can face the outer surface of the notch downward.
When the holder is placed on the heat dissipation substrate such that the holes of the pair of attachment pieces and the pair of cutout portions are positioned on the same line, the attachment pieces are formed on the cutout portions. A light-emitting device that covers a peripheral portion and is in a state in which the protruding portion faces an outer surface of the notch.   The light emitting device according to claim 1, wherein the heat radiating substrate and the holder are provided with a hole for mutual positioning and a rib capable of being press-fitted into the hole.   The light-emitting device according to claim 1, wherein the holder has a rotationally symmetric structure of 180 ° when viewed from the light-emitting direction side of the light-emitting device.   The light-emitting device according to claim 1, wherein the holder is made of a flexible synthetic resin. The light-emitting device according to claim 1, further comprising a lens inside the cylindrical portion of the holder,
The light source has a structure in which a light emitting element chip is surface-mounted on a package,
The light emitting device, wherein the lens is disposed above the light source, and has a structure in which a light emitting element chip of the light source is positioned inside the lens from the lower surface of the lens.   6. The light emitting device according to claim 1, wherein the protrusion has an inner surface having a circular arc cross section that can be opposed along an outer surface of the cutout portion of the heat dissipation substrate.   7. The light emitting device according to claim 1, wherein the holder mounting hole and the notch portion of the heat dissipation substrate are shared by screws in a state where the holder is placed on the heat dissipation substrate. An illumination lamp characterized by being fastened and fixed.

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