JP2012069396A - Lighting unit and lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting unit capable of obtaining sufficient heat radiation efficiency to heating of an LED even having a small and thin-size shape and capable of maintaining excellent light-emitting characteristics for a long period, and a lighting system loading it on a lamp socket.SOLUTION: The lighting unit has a light-emitting element mounted on one face of a substrate, a projection part which is a base part for supplying electric power to the light-emitting element from the outside and is arranged on the other face of the substrate, and houses and covers a lighting circuit with a size smaller than the outline size of the substrate, and electrode pins which are arranged on both sides of the projection part and supply power supply from the outside to the lighting circuit. A top plate of the projection part is thermally joined with a pillar-shaped heat-radiation axis at the center of the substrate on the other face of the substrate.

Description

  The present invention relates to an illumination unit including a semiconductor light emitting element such as an LED (light emitting diode) and an illumination device in which the illumination unit is loaded in a lamp socket.

  In recent years, LEDs (Light emitting diodes) having high brightness and a semi-permanent lifetime have been used for lighting units. However, in an illumination unit that requires high brightness, the higher the brightness of the LED of the light source, the higher the heat generation of the LED, which not only adversely affects the light emission efficiency and life of the LED itself, but also the heat generation. However, since the components of the lighting unit are also deteriorated, there are problems in light emission characteristics and durability.

  Therefore, a heat dissipating structure for transferring heat generated by the LED mounted on the lighting unit to the luminaire main body having the lamp socket by using the cap and lamp socket of GX53 standardized by IEC (International Electrotechnical Commission). A lighting unit provided has been proposed (for example, Patent Document 1).

  This lighting unit has a twist and lock system that is easy to attach and detach. The lighting device is mounted on the main body of the lighting fixture. The outer periphery of the lighting unit and the upper surface of the protrusion of the base contact the side surface and the upper surface inside the case of the main body. In this configuration, the heat generated by the LED is transferred to the case of the luminaire main body, and the case acts in the same manner as the heat radiating fins, so that an excellent heat radiation effect can be obtained.

JP 2010-129488 A (page 4, FIG. 1)

  However, when the LED is mounted on the central portion of the metal substrate in order to obtain the point light source characteristics of the LED and the heat generated by the LED is efficiently transferred to the case side, the following problems occur. In the prior art shown in Patent Document 1, heat generated from a plurality of LEDs is transferred only by the connection between the outer peripheral portion of the metal substrate on which the LEDs are mounted and the outer peripheral portion of the base metal part, and the heat is transferred to the base. Since it is a structure to transmit, the heat of the LED mounted on the central part of the metal substrate cannot be efficiently transmitted to the base part. That is, the LED formed at the center of the metal substrate cannot sufficiently reduce the thermal resistance from the LED to the protruding portion of the base, and the effect of heat dissipation cannot be expected so much. This problem is particularly noticeable when the lighting unit has a high heat dissipation performance even if it is small and thin, and can maintain excellent light emission characteristics over a long period of time.

  An object of the present invention is to provide a lighting unit capable of obtaining sufficient heat dissipation efficiency for the heat generation of an LED and maintaining excellent light emission characteristics over a long period of time, even if it is small and thin, and a lamp The object is to provide a lighting device loaded in a socket.

  The lighting unit of the present invention employs the following configuration in order to achieve the above object.

The illumination unit of the present invention is a light emitting element mounted on one surface of a substrate and a base part for supplying electric power to the light emitting element from the outside, and is disposed on the other surface side of the substrate, In an illumination unit having electrode pins that are arranged on both sides of a protrusion smaller than the size and receive electric power from the outside, the top plate of the protrusion is arranged at the center of the substrate on the other side of the substrate at the columnar heat dissipation shaft. It is characterized by being thermally bonded at

  The lighting device of the present invention is characterized in that when the lighting unit described above is loaded in a lamp socket, the top plate of the protruding portion and the heat conducting member disposed on the lamp socket side are thermally coupled. To do.

  As described above, according to the present invention, even if the LED is arranged in the center of the metal substrate in order to take advantage of the point light source characteristics of the LED, the heat dissipation characteristics sufficient for the heat generation of the LED can be obtained. Therefore, it is possible to provide an illumination unit that can maintain excellent light emission characteristics over a long period of time, and an illumination device including the illumination unit in a lamp socket.

It is a perspective view which shows the external appearance of one Example of the illumination unit of this invention. It is AAA sectional drawing shown in FIG. 1 of the illumination unit of this invention. It is a perspective view for demonstrating loading to the GX53 lamp socket of the illumination unit of this invention. It is sectional drawing of the figure which loaded the lighting unit of this invention in GX53 lamp socket. It is a disassembled perspective view which shows the structure of the illumination unit of this invention.

Embodiments of the present invention will be specifically described below with reference to the drawings. In the embodiment described below, the base of the lighting unit will be described as an example of a base of GX53 standardized by IEC (International Electrotechnical Commission).
[Overall configuration of lighting unit: Fig. 1]
First, the whole structure of the illumination unit of a present Example is demonstrated using FIG. FIG. 1 is a perspective view showing the external appearance of this illumination unit from the base side of GX53, and is a view in which white light for illumination is emitted downward. In each figure, the same number is attached to the same component, and the duplicate explanation is omitted.

  The lighting unit 1 shown in FIG. 1 is a device aimed at miniaturization and thinning. The lighting unit 1 is mounted in a lamp socket (not shown) to supply power from the outside, and a light source including an LED. The heat radiation upper block 3 and the heat radiation lower block 4 for releasing the generated heat to the outside, and the cover 8 that transmits the irradiation light from the light emitting source. Note that a circuit board on which a lighting circuit (not shown) and a light emission source are mounted is incorporated in the base 2.

  The base 2 is based on the standard of GX53, and has two electrode pins 23 arranged at a distance of 53 mm in the base body 21 and the two electrode pins 23 with notches 93 at both ends. The projection 24 is provided with a metal top plate 9.

The heat dissipating upper block 3 and the heat dissipating lower block 4 have substantially the same shape, and have a large number of heat dissipating fins 32 and 42 arranged radially from the center to the outside. It often dissipates heat by convection and heat radiation. A heat radiation path from the light emitting source to the heat radiation fins 32 and 42 is defined as a first heat conduction path. In addition, the lighting unit 1 thermally couples the top plate 9 from the circuit board on which the LED is mounted, and thermally insulates the top plate 9 and the heat dissipating upper block 3 by the base 2 to thereby generate heat generated in the light source. In this way, heat can be released from the top plate 9 in the same manner. A heat radiation route from the light emission source 7 to the top plate 9 is defined as a second heat conduction route.
[Configuration of lighting unit and heat conduction path: Fig. 2]
Next, the thermal coupling form and the heat radiation route by which it is a characteristic part of the present invention will be described. FIG. 2 is a cross-sectional view taken along line A-O-A shown in FIG. 1 and is a diagram for explaining the configuration of the lighting unit and the heat conduction action.

  As shown in FIG. 2, the heat generated when the light emitting source 7 disposed at the center position of the circuit board 6 is turned on is mainly generated from the circuit board 6 which is a metal base board, by the first and second heats. It is emitted to the outside via the conduction path.

  The first heat conduction path is substantially the same as the conventional heat conduction path, and the heat generated by the light emitting source 7 arranged at the center of the circuit board 6 is guided to the board extension part of the circuit board 6, A path (indicated by a dotted line in the figure) in which heat is transferred to the heat dissipating upper block 3 and the heat dissipating lower block 4 and the heat dissipating fins 32 and 42 by which the substrate 6 is sandwiched to dissipate heat mainly from the heat dissipating fins 32 and 42. It is.

  The second heat conduction path is a characteristic part of the present invention, and is provided upright on the heat radiating shaft support plate 92 that is in contact with the back surface of the circuit board 6 on which the light emitting source 7 is mounted. The columnar heat radiating shaft 91 is a path (solid arrow in the figure) that conducts heat to the top plate 9 fixed to the columnar heat radiating shaft 91. The second heat conduction path indicated by the solid line arrow is required to reduce the thickness of the lighting unit 1, and the surface area of the radiation fins 32 and 42 cannot be sufficiently secured, and heat radiation due to convection cannot be expected. This is particularly effective when the heat radiation amount of the heat radiation route (first heat conduction path) from the board extension portion cannot be expected so much. At this time, it is desirable that the heat radiating shaft support plate 92 has a good thermal conductivity by reducing the contact thermal resistance of the joint surface with the circuit board 6 with a heat conductive sheet or heat conductive grease. In the present invention, the second heat conduction path is essential, but the first heat conduction path may be omitted.

  The columnar heat radiating shaft 91 is configured to guide the heat generated by the light emission source 7 from the circuit board 6 to the top plate 9, and to house the components inside the housing, and at the final stage of assembling the components, One end is screwed to the heat dissipation shaft support plate 92 and is upright, and passes through the lighting circuit board hole 53 in the central part of the lighting circuit board 51 and the central part of the base 2, The structure extends to a position near the upper surface opening 26. The top plate 9 is screwed to the other end and is tightened using a notch 93. The notches 93 of the top plate 9 are formed as grooves or long holes, and a pair is provided to improve the tightening workability when the top plate 9 is screwed to the columnar heat dissipation shaft 91. Two or more pairs may be provided to further facilitate the tightening operation.

  Further, as described above, the notch 93 provided in the base 2 is used not only for incorporating the components of the lighting unit 1 in the final stage of assembling the top plate 9 but also for the heat dissipation upper block 3 or the heat dissipation lower block. The air flow in the lighting unit 1 may be created by an intake hole and a notch 93 (not shown) provided in either one or both of the four.

  As described above, the lighting unit 1 is configured to perform the first heat conduction in which the heat generated by the light source 7 disposed in the central portion of the circuit board 6 is guided to the radiation fins 32 and 42 via the outer extending portion of the circuit board 6. Heat is dissipated through two routes: a route, a circuit board 6, a heat dissipation shaft support plate 92, and a columnar heat dissipation shaft 91, which is conducted to the top plate 9 and radiated from the top plate 9. Therefore, even if the light emission source 7 is arranged at the center of the circuit board 6 and the lighting unit 1 is made small and thin, heat is not trapped inside the circuit board 6 and the base 2 and sufficient heat radiation performance can be obtained. . As a result, the lighting unit 1 can maintain excellent light emission characteristics over a long period of time.

[Explanation of the loading of the lighting unit into the lighting fixture body and heat conduction: FIGS. 3 and 4]
Next, it will be described with reference to FIGS. 3 and 4 that when the lighting unit 1 having the first and second heat conduction paths described above is combined with a lighting fixture body, the lighting device has excellent heat dissipation characteristics. To do. FIG. 3 is a perspective view illustrating the mounting of the lighting unit to the luminaire main body, with a part of the case being cut away. FIG. 4 is a view in which the lighting unit 1 is loaded in the lamp socket 11 and is shown in a sectional view through a pair of electrode pins. In each figure, the same number is attached to the same component, and the duplicate explanation is omitted.

  As shown in FIG. 3, the lighting unit 1 described above is mounted on a downlight type lighting fixture body 10 including a case 16 and a lamp socket 11 of GX53, thereby forming a lighting device. The case 16 in the luminaire main body 10 is made of metal, has a cup shape, has a reflective surface on the inside, and has a shape whose diameter is expanded downward.

  The lamp socket 11 is made of a resin having an annular shape and insulating properties, and a fitting hole 12 that penetrates the lamp socket 11 has a dimension based on the standard of GX53. In addition, a pair of protrusions 13 projecting toward the central axis is formed on the inner surface of the fitting hole 12, and engages with the guide groove 27 of the illumination unit 1 to fix the illumination unit 1. used.

  A heat conductive member 19 is attached to the cup-shaped case bottom at a position exposed from the fitting hole 12. The heat conductive member 19 is preferably a heat conductive sheet, a heat conductive sponge, a metal leaf spring, or the like that is excellent in heat conductivity. One surface is an adhesive surface, and the adhesive surface is attached to the inside of the case 16. It consists of members. Further, the portion of the case 16 to which the heat conducting member 19 is attached is made of a metal having good heat conduction, transfers heat from the attached portion to a wide area, and dissipates heat by convection and heat radiation.

  Further, on the lower surface of the lamp socket 11, a pair of arc-shaped electrode pin insertion elongated holes 14 positioned in rotational symmetry with respect to the central axis of the lamp socket 11, and one end of the arc-shaped electrode pin insertion elongated hole 14 are provided. Each has an enlarged diameter portion 15 so that when the connection terminal inside the electrode pin insertion hole 14 and the electrode pin 23 of the illumination unit 1 are electrically joined, power can be supplied to the illumination unit 1 from the outside of the case 16. It has become.

  Next, a procedure for loading the lighting unit 1 into the lamp socket 11 of the lighting fixture body 10 will be described.

  When the lighting unit 1 is loaded into the lamp socket 11, the position of the pair of protrusions 13 protruding from the inner surface of the fitting hole 12 and the vertical guide groove 271 of the guide groove 27 on the side surface of the protrusion 24 of the lighting unit 1 is determined. Then, by aligning the tip diameter large portion of the electrode pin 23 of the lighting unit 1 with the position of the enlarged diameter portion 15 of the electrode pin insertion elongated hole 14 of the lamp socket 11, the lighting unit 1 is placed in the lamp socket 11 in the direction of arrow D. Insert it close to.

  Next, the illumination unit 1 is rotated rightward so that the projection 13 of the lamp socket 11 is guided to the horizontal guide groove 272 of the guide groove 27 of the illumination unit 1 and at the same time the edge of the electrode pin insertion long hole 14. The large diameter of the tip end of the electrode pin 23 is caught on the surface, and the loading of the lighting unit 1 into the lamp socket 11 is completed at a stable position. In this state, the top plate 9 of the lighting unit 1 and the heat conducting member 19 are in surface contact.

  FIG. 4 shows the positional relationship between the lighting fixture body 10 and the lighting unit 1 at this time.

As shown in FIG. 4, the cup-shaped case 16 of the luminaire main body 10 has a flat plate portion 17 and an enlarged diameter portion 18, and the heat conducting member 19 is inside the fitting hole 12 of the lamp socket 11. 16
Is attached to an exposed position inside the flat plate portion 17. Thereby, when the illumination unit 1 is loaded in the lamp socket 11, the heat conducting member 19 comes into surface contact with the top plate 9, and the top plate 9 and the case 16 can be thermally joined.

  The heat generated in the light emission source 7 of the illumination unit 1 is conducted not only through the first heat conduction path described above but also through the heat radiation shaft support plate 92 and the columnar heat radiation shaft 91 immediately behind the circuit board 6. The heat is efficiently radiated through the second heat conduction path for transferring heat to the plate 9.

Thus, even if the lighting unit 1 of the present embodiment in which the light source 7 is arranged at the center of the circuit board 6 is small and thin, sufficient heat radiation performance is obtained and the light emitting device 1 has excellent light emitting properties. This effect is particularly remarkable when the base of GX53 is used.
[Internal configuration of lighting unit and specific example: FIG. 5]
Next, a specific internal configuration example of the lighting unit of the present embodiment will be described. FIG. 5 is an exploded perspective view of the lighting unit 1 and screws are omitted because they are complicated.

  As shown in FIG. 5, the base 2 is made of an insulating resin made of, for example, PBP, and has a projecting portion 24 projecting from the substantially cylindrical base body 21 in the central axis direction, and a pair of guides formed on the side surfaces thereof. The groove 27 (vertical vertical guide groove portion 271 and horizontal horizontal guide groove portion 272) has an opening 26 on the upper surface 25, and the top plate 9 is fitted into the opening 26.

  The base body 21 is formed with a pair of electrode pin support portions 22 projecting in the radial direction, and electrode pins 23 projecting from the electrode pin support portions 22. In addition, these protrusion part 24, a pair of electrode pin 23, and a pair of guide groove 27 are the dimension shapes based on the specification of GX53.

  The heat dissipating upper block 3 is made of, for example, an aluminum drawn material, extruded material, or die-cast, and the cylindrical inner wall surface 33 is formed in a size that allows the base body 21 to be fitted.

  Further, a large number of heat radiation fins 32 are formed on the outer wall surface 31 of the heat dissipation upper block 3 in a radial direction from the center to the outside with a length corresponding to the protruding amount of the electrode pin support portion engaging portion 35. The upper block 3 defines.

  The lighting unit 1 configured as described above has a configuration in which the length of the radiating fins 32 is extended while miniaturizing as close as possible to the outer dimensions of the base of the GX53 defined by the standard. Thereby, the heat dissipation characteristics are improved, and a small lighting unit having excellent light emission characteristics is obtained. The inner wall surface 33 is provided with three inner wall protrusions 34 for fastening the heat dissipating lower block 4, the circuit board 6, the heat dissipating upper block 3, and the base 2 together with screws at equal intervals. It can be combined.

  The lower heat dissipation block 4 has the same material and the same outer shape as the upper heat dissipation block 3, and the outer wall surface 41 has heat radiation fins 42 and electrode pin support portion engaging portions 45, and the cylindrical inner wall surface 43. The inner wall protruding portion 44 and the heat radiation lower block 4 are provided with sink portions for fitting the circuit board 6 and the cover 8 on the upper surface and the lower surface, respectively, at equal intervals. The heat dissipation lower block 4 is formed thinner than the heat dissipation upper block 3 in accordance with the mounting thickness of the LED 71 which is a microchip of the light emitting source 7.

The lighting circuit 5 includes a plurality of lighting circuit components 52 mounted on one side of a lighting circuit board 51 made of a glass epoxy board, and a synthetic resin or ceramic as a material having good insulation on the heat radiation shaft support plate 92. It arrange | positions through the spacer 54 which consists of. Accordingly, the lighting circuit 5 is accommodated in an internal space formed by the circuit board 6 and the protruding portion 24 of the base 2 having a size smaller than the outer diameter of the circuit board 6.

  The circuit board 6 is preferably a metal board made of a material that easily conducts heat generated by the mounted light emitting source 7, and is formed of a metal base board in which a wiring circuit is formed on an aluminum plate. The front side of the circuit board 6 is a metal surface 64 from which the base material is exposed. The outer peripheral portion thereof is tightly coupled to the heat dissipation upper block 3, and the central portion thereof is tightly coupled to the heat dissipation shaft support plate 92.

  In the center of the heat radiating shaft support plate 92, a columnar heat radiating shaft 91 having screws formed at both ends is screwed at one end and is erected, penetrates the lighting circuit board hole 53 of the lighting circuit 5, and the top plate at the other end. 9 is connected with a screw. The top plate 9 is formed with a pair of notches 93 so that the screws can be easily tightened.

  Here, the light emission source 7 arranged on the back side of the circuit board 6 will be described with reference to an exploded perspective view of FIG.

  The light emission source 7 includes an LED 71, a sub plate 72, and an FPC 73. The LED 71 emitting blue light is mounted on a sub-plate 72 made of thermally conductive ceramic, and is formed by sealing with a translucent silicone resin in which a YAG yellow phosphor is dispersed and mixed. The electrical connection between the sub-plate 72 on which the LED 71 is mounted and the wiring pattern on the mounting surface is performed by the FPC 73. When power is supplied from the electrode pin 23, it is controlled by a lighting circuit or the like, and the blue light of the LED 71 The yellow phosphor wavelength-converted light is mixed and white light is emitted from the light source 7.

  Note that the light source 7 is directly adhered to the light source pasting surface 62 at the center of the back surface of the circuit board 6 in the direction of arrow C with a heat conductive sheet or heat conductive grease. As a result, the circuit board 6 on which the light emitting source 7 is mounted constitutes a first heat conduction path by the exposed portion of the base material, and the columnar heat dissipation shaft 91 thermally coupled to the circuit board 6 2 heat conduction paths are formed.

  The reflection plate 81 gives excellent light distribution characteristics to the point light source LED 71 disposed in the center of the circuit board 6. The cover 8 is made of transparent light diffusing resin or glass, and is fitted into the heat radiating block 4 so as to protect the light source 7 mounted on the circuit board 6.

  In this manner, the lighting unit 1 having the base GX53 has a sufficient heat dissipation performance and has excellent light emission characteristics even if it is small and thin.

  As described above, according to the present invention, the columnar heat dissipation shaft 91 and the top plate 9 are provided on the back side of the substrate corresponding to the position of the light emission source 7 disposed in the center of the circuit board 6. Since the second heat conduction path is formed by thermal joining, the thermal resistance from the light emitting source 7 to the flat plate 17 of the case 16 through the top plate 9 is reduced. It becomes an illumination unit that obtains good heat dissipation characteristics by heat radiation and can maintain excellent light emission characteristics over a long period of time.

  Further, in the present invention, the LED 71 of the light emission source 7 has exemplified the form in which the wavelength of blue light emission is converted to emit white light, but instead, the wavelength of purple light emission may be converted, Blue, red, and green LEDs may be used as the light emission source.

  In addition, the above-described columnar heat dissipation shaft 91 may be configured to thermally radiate heat by joining the top plate 9 at the center position of the circuit board 6, and the LED 71 is not necessarily located at a position corresponding to the columnar heat dissipation shaft 91. However, the effect of the present invention can be obtained.

  Furthermore, it is not limited to the embodiment of the lighting unit described above, it is not necessary to perform all of them, and various modifications and omissions may be made within the scope of the contents described in the claims of the claims. It goes without saying that we can do it.

1: Lighting unit 2: Base 3: Heat dissipation upper block 4: Heat dissipation lower block 5: Lighting circuit 6: Circuit board 7: Light source 8: Cover 9: Top plate 10: Lighting fixture body 11: Lamp socket 12: Fitting hole 13: Projection 14: Electrode pin insertion slot 15: Expanded portion 16: Case 17: Flat plate portion 18: Expanded portion 19: Thermal conduction member 21: Base body 22: Electrode pin support portion 23: Electrode pin 24: Projection Portion 25: Upper surface 26: Upper surface opening 27: Guide groove 31, 41: Outer wall surface 32, 42: Radiation fin 33, 43: Inner wall surface 34, 44: Inner wall protrusion 35, 45: Electrode pin support portion engaging portion 51: Lighting circuit board 52: Lighting circuit component 53: Lighting circuit board hole 54: Spacer 61: Mounting surface 62: Light emitting source pasting surface 63: Outer edge portion 64: Metal surface 71: LED
72: Sub-plate 73: FPC
81: Reflecting plate 91: Columnar heat radiation shaft 92: Heat radiation shaft support plate 93: Notch

Claims (5)

A light emitting element mounted on one surface of a substrate and a base part for supplying electric power to the light emitting element from the outside, disposed on the other surface side of the substrate, and having a size smaller than the outer size of the substrate In the lighting unit having the protruding portion, and electrode pins that are arranged on both sides of the protruding portion and receive power from the outside,
The lighting unit is characterized in that the top plate of the protruding portion is thermally joined by a columnar heat dissipation shaft in the center of the substrate on the other surface of the substrate. The lighting unit according to claim 1, wherein the light emitting element is disposed in a central portion of one surface of the substrate. The lighting unit according to claim 1, wherein a screw is cut at a tip of the columnar heat dissipation shaft, and the other surface of the substrate is fixed with the screw. The lighting unit according to claim 3, wherein the top plate of the protruding portion has at least two notches. When the lighting unit according to any one of claims 1 to 4 is loaded in a lamp socket, the top plate of the protruding portion and the heat conducting member disposed on the lamp socket side are thermally coupled. A lighting device.

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