JP2012048899A - Illumination unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an illumination unit which is excellent on a heat-radiation effect to heat generation of an LED in spite of high luminance and is superior in light-emitting characteristics and durability and has a smaller outer diameter shape.SOLUTION: In the illumination unit having a circuit board where a light-emitting source is mounted, an illumination body connected with the circuit board at a cylindrical inner wall surface, a plurality of heat-radiating fins radially extended from an outer wall surface of the illumination body and integrated with the illumination body, and a base wherein electrode pins for supplying power to the light-emitting source are arranged on a base body by projecting from the illumination body, an outer shape of the base is so structured that a range having the electrode pins becomes a diameter-enlarged section more projected in comparison with the other ranges and the other ranges become a diameter-lessened sections, and the plurality of heat-radiating fins are formed on the diameter-lessened sections of the other ranges.

Description

  The present invention relates to an illumination unit including a semiconductor light emitting element such as an LED (light emitting diode).

  In recent years, LEDs (Light emitting diodes) with high brightness and semi-permanent lifetime have been used, and further, a GX53 type base standardized by IEC (International Electrotechnical Commission) has been formed, and a lamp socket (receiver) Therefore, there is a demand for a compact lighting unit that can be easily attached and detached, and incorporates a microchip LED.

  However, this high-brightness and compact lighting unit not only increases the heat generation of the LED as the brightness of the LED of the light source increases, but also adversely affects the light emission efficiency and life of the LED itself. Since heat generation also deteriorates the components of the lighting unit, there are problems in light emission characteristics and durability, and measures for heat dissipation are important.

  Therefore, a structure is proposed in which a lighting unit having a GX53-type base and a lamp socket are loaded in a twist and lock manner to form a surface contact portion between the lighting unit and the lighting fixture body, and the heat generated from the LED is radiated from that portion. (Patent Document 1).

  On the other hand, similarly to Patent Document 1, Non-Patent Document 1 proposes a structure in which heat sink fins are formed on the outer periphery of the base while forming a GX53 type base in the illumination unit.

  FIG. 6 is an external perspective view of a schematic diagram for explaining the main points from a photograph published in Non-Patent Document 1.

  As shown in FIG. 6, the lighting unit 100 includes a pair of electrode pins 102 protruding from a base body 101 having an outer diameter defined by the GX53 standard, and a base body 101 with a predetermined shape and interval. The heat dissipating fins 103 are formed on the outer periphery. Therefore, in the illumination unit 100 of Non-Patent Document 1, the heat generated from the mounted high-brightness LED has excellent heat dissipation characteristics by the heat dissipation fins 103, and enables good light emission characteristics and durability.

JP 2010-129488 A (page 5, FIG. 1)

Toshiba Lighting & Technology Co., Ltd., press release, LED light LED unit “flat type 6.4W” to realize future lighting (photo), [online], September 30, 2009, [July 9, 2010 Day search], Internet <https://www3.toshiba.co.jp/tlt/topix/press/p090930a/p090930a.htm>

However, the prior art disclosed in Patent Document 1 forms a portion where the lighting unit and the lighting fixture main body are in surface contact with each other, and only after the lighting unit is incorporated into the lighting fixture main body, the heat generated by the LED is emitted from the lighting unit to the lighting fixture. It is configured to transfer heat to the main body and dissipate heat. Therefore, even if this lighting unit is mounted on another luminaire main body having the same GX53 type lamp socket, there is no portion in surface contact with each other, and the structure cannot dissipate heat.

  In addition, the conventional lighting unit 100 shown in Non-Patent Document 1 uses a GX53 type base, is easy to attach and detach, has compatibility, and has a heat dissipating fin 103 and is excellent in heat dissipating characteristics. Thus, since the heat radiation fins 103 are formed on the outer periphery of the electrode pins 102 having an interval of 53 mm, it is impossible to make the illumination unit smaller and smaller in outer diameter.

  An object of the present invention is to provide a small lighting unit that has a high luminance, has an excellent heat dissipation effect with respect to the heat generated by the LED, has good light emission characteristics, and has a small outer diameter. It is an object of the present invention to provide a lighting unit that is easily detachable and compatible by adopting a configuration that incorporates a standardized base.

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

  An illumination unit according to the present invention includes a circuit board on which a light emitting source is mounted, an illumination main body connected to the circuit board with a cylindrical inner wall surface, and a plurality of elements that extend radially from the outer wall surface of the illumination main body and are integrally formed with the illumination main body. In an illumination unit having a heat dissipating fin and a base provided with an electrode pin for supplying power to the light source to the base body projecting from the lighting body, the outer shape of the base, the region where the electrode pin is provided, It is characterized in that it has a large-diameter shape projecting as compared with other regions, the other region has a small-diameter shape, and a plurality of radiating fins are formed in the small-diameter portion of the other region.

  The plurality of radiating fins are also formed in the large-diameter region where the electrode pin is provided, and the fin length of the radiating fin in the large-diameter portion of the region where the electrode pin is provided is smaller than that in the other region. You may shorten compared with the fin length of a part.

  As described above, according to the present invention, although the outer diameter is small and the heat radiation fin is formed, the light emission characteristics and durability are good even when a high-brightness LED is used due to the reliable heat radiation by the heat radiation fin. It is possible to provide a simple lighting unit.

  Furthermore, it is possible to provide a lighting unit that is easily detachable and compatible.

It is a perspective view which shows the external appearance of Example 1 of the illumination unit of this invention. It is a perspective view which shows the external appearance which turned the lighting unit shown in FIG. 1 upside down. It is a disassembled perspective view which shows the structure of the illumination unit of this invention. FIG. 2 is a cross-sectional view of the lighting unit shown in FIG. It is a perspective view which shows the external appearance of Example 2 of the illumination unit of this invention. It is a perspective view of the external appearance of the conventional lighting unit.

  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 GX53 type base standardized by IEC (International Electrotechnical Commission).
[Example 1]
1 to 4 are drawings for explaining the configuration of the illumination unit according to the first embodiment.
FIG. 2 is a perspective view showing the appearance of the illumination unit from the GX53 type base side, FIG. 2 is a perspective view showing the appearance of the illumination unit with the upper and lower surfaces of FIG. 1 turned upside down, and FIG. FIG. 4 is a diagram for explaining the configuration of the illumination unit with a cross-sectional view taken along the line AOA of FIG. 1.
[Configuration of Lighting Unit of First Embodiment: FIGS. 1 to 4]
First, the whole structure of the illumination unit of Example 1 is demonstrated using FIGS. 1-4. In each figure, the same number is attached to the same component, and the duplicate explanation is omitted. FIG. 1 is a perspective view of the appearance of an illumination unit as viewed from the base side, and is a view in which white light for illumination is emitted downward.

  As shown in FIG. 1, the lighting unit 1 includes a GX53 type base 2, a heat dissipation upper block 3, a heat dissipation lower block 4, and a cover 8 (see FIG. 2). A circuit board on which a light emission source is mounted is incorporated (details will be described with reference to FIGS. 3 and 4).

  In the base 2 described above, a pair of projecting portions 22 projecting in the radial direction from the base body 21 form a large-diameter portion, and the electrode pin 23 has a shape dimension (based on the GX53 type standard) on each of the projecting portions 22 ( 53 mm). That is, the base body 21 is formed of an electrode pin 23 having a GX53-type shape, a large-diameter portion of a region for holding the pin, and a small-diameter portion of a region narrowed inward except for the protruding portion 22. The electrode pin 23 supplies power from an external power source to the internal power supply circuit when the electrode pin 23 is loaded in an external socket (not shown). The lighting unit 1 is fixed to the external socket by engaging the protrusion of the external socket with the L-shaped guide groove 24 provided on the side wall portion of the base 2 in the drawing, and loading with a twist & lock method. .

  The heat dissipating upper block 3 is formed along the base body 21 and the projecting portion 22 of the base 2, that is, along the large diameter portion shape and the small diameter portion shape, and on the outside of the small diameter portion, A large number of radiating fins 32 are formed by extending radially. The fin length of the heat radiating fin 32 corresponds to the protruding amount of the protruding engagement portion 35 that engages with the protruding portion 22.

  The lower heat dissipation block 4 has the same outer shape as the upper heat dissipation block 3 and forms a large number of radial heat dissipating fins 42 and protruding engagement portions 45. The heat dissipation lower block 4 forms a pair of the heat dissipation upper block 3 and the illumination body 10.

  The large number of radial fins 32 and 42 formed on the illumination body 10 radiate the heat generated by the LED as the light source, thereby providing good light emission characteristics and durability, and the outer diameter is protruding. It is possible to provide a small lighting unit 1 that is narrowed down to the engaging portions 35 and 45.

  Next, the configuration of the lighting unit 1 on the back side of FIG. 1 will be described. FIG. 2 is a perspective view of an appearance in which the upper and lower surfaces of the illumination unit 1 of FIG. 1 are inverted, and is a view in which white light for illumination is emitted upward.

  As shown in FIG. 2, the cover 8 is screwed to a sinking portion formed in the heat radiating lower block 4. The illumination unit 1 is hermetically sealed by the base 2, the illumination main body 10, and the cover 8, and is formed so as to protect the power supply circuit and the light emitting source LED incorporated therein.

  Next, the internal configuration of the illumination unit 1 will be described. FIG. 3 is an exploded perspective view for explaining the lighting unit 1 in more detail, and screws are not shown because they are complicated.

As shown in FIG. 3, the illumination unit 1 includes the base 2, the heat dissipation upper block 3, the power supply circuit 5, the circuit board 6, the light emission source 7, the heat dissipation lower block 4, and the cover 8 as described above. Formed from.

  The base 2 is made of, for example, an insulating resin made of PBT (polybutylene terephthalate), and the shape of the base 2 is a two-stage cylindrical base body 21 and a pair of protrusions projecting radially from the base body 21. The protrusions 22 and a pair of electrode pins 23 formed at standardized dimensions and intervals are formed on each protrusion 22. The pair of electrode pins 23 are electrically connected to the internal power supply circuit 5 and are supplied with power from an external socket. In other words, the base 2 has a shape equivalent to that of the GX53 type base and is formed in a structure that can be easily attached to and detached from the GX53 type socket.

  The heat dissipating upper block 3 is made of, for example, an aluminum extruded material or die-cast, and a cylindrical inner wall surface 33 is formed along the outer periphery of the base body 21 and the protruding portion 22. 35 is formed.

  A large number of radiating fins 32 are radially extended from the outer wall surface 31 of the radiating upper block 3, and the fin length of the radiating fins 32 is formed to a length corresponding to the protruding amount of the projecting engagement portion 35. . Therefore, the tips of the heat radiation fins 32 and the protrusions of the protruding engagement portions 35 are on the same circumference, and form the outer diameter of the heat radiation upper block 3.

  In other words, the outer diameter of the lighting unit 1 is formed so as not to exceed the protruding engagement portion 35, and it is possible to provide a small lighting unit 1 having a small outer diameter, and the diameter of the base body 21 is possible. By narrowing down as much as possible, it is possible to extend the fin length of the heat radiating fins 32, improve the heat radiating characteristics, and provide the high-luminance lighting unit 1.

  The inner wall 33 is formed with three inner wall projections 34 at equal intervals for fastening the lower heat dissipation block 4, the circuit board 6, the higher heat dissipation block 3 and the base 2 with screws. To ensure good heat conduction.

  The heat radiating lower block 4 is made of the same material as the heat radiating upper block 3, and has almost the same outer shape as the heat radiating upper block 3, and the outer wall surface 41 is formed with heat radiating fins 42 and projecting engagement portions 45, On the cylindrical inner wall surface 43, three inner wall projections 44 for fastening the heat dissipation upper block 3, the circuit board 6, the heat dissipation lower block 4 and the base 2 together with screws are formed at equal intervals. And the sinking part which fits the circuit board 6 and the cover 8 in each of the upper surface and lower surface of the heat dissipation lower block 4 is formed. And the cover 8 is arrange | positioned on the outer side so that the light emission source 7 mounted in the circuit board 6 may be protected.

  The power supply circuit 5 has a plurality of power supply circuit components 52 mounted on one side of a power supply circuit board 51 made of a glass epoxy substrate, and is electrically connected to the pair of electrode pins 23 and the circuit board 6. And the power supply circuit 5 converts the electric power supplied from the electrode pin 23, and supplies electric power to the circuit board 6 in which the light emission source 7 was mounted.

  The circuit board 6 is made of a metal core board, that is, a so-called metal base board in which a wiring circuit is formed on a copper or aluminum plate, and is made of a material that easily conducts heat generated by the mounted light emitting source 7. The front side of the circuit board 6 is a metal surface 64 from which the base material is exposed, and is closely bonded to the heat dissipating block 3 to improve the thermal conductivity.

  Next, the configuration on the back side of the circuit board 6 (configuration of the LED mounting surface) will be described with reference to the 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 that emits blue light is mounted on a sub-plate 72 made of thermally conductive ceramics or highly reflective aluminum, and is sealed with a translucent silicone resin in which a YAG yellow phosphor is dispersed and mixed. . The electrical connection of the LED 71 is connected to the sub-plate 72 with a bonding wire or the like, and then connected to the mounting surface 61 of the circuit board 6 via the FPC 73.

  The mounting surface 61 is coated with a white resist having a high reflectance, and an LED driver and a control circuit (display of circuit components are omitted) for controlling the lighting of the LED 71 are mounted. When electric power is supplied to the electrode pin 23, the LED 71 emits blue light by the control circuit and the LED driver, the wavelength of the emitted light is converted by the yellow phosphor, and white light is emitted from the light source 7.

  The base material of the circuit board 6 is exposed at the light emitting source pasting surface 62 and the outer edge 63 on the back surface of the circuit board 6. The light emitting source 7 is disposed on the light emitting source pasting surface 62 in the direction of the arrow C, and is directly adhered with a heat radiating sheet or heat radiating silicon grease and fixed with screws. The outer edge portion 63 is a surface in which the lower heat dissipation block 4 and the inner wall protruding portion 44 are in direct contact with each other, and transfers heat generated from the light emitting source 7 to the lower heat dissipation block 4 to enable good heat dissipation.

  That is, the circuit board 6 on which the light emitting source 7 is mounted is directly coupled to the heat dissipating upper block 3 and the heat dissipating lower block 4 at an exposed portion of the base material, and by bonding metals having good thermal conductivity, A structure with good heat transfer characteristics is formed.

  The cover 8 is made of translucent transparent or light diffusing resin, or glass, and is fitted into the heat radiating lower block 4 and screwed.

  As shown in FIG. 4, the circuit board 6 on which the light emitting source 7 is mounted is sandwiched between the heat dissipating upper block 3 and the heat dissipating lower block 4, and is fastened together with the cap 2 by a cap fixing screw 11. Therefore, the heat generated by the high-luminance light source 7 is dissipated from the circuit board 6 through the heat dissipating upper block 3 through the heat dissipating fins 32 and through the heat dissipating lower block 4 through the heat dissipating fins 42. Good heat dissipation characteristics are obtained by forming both heat dissipation paths.

  In the power supply circuit 5, the power supply circuit board 51 is fastened together with the light emitting source 7 via a spacer 65 disposed on the circuit board 6 and fixed by the spacer screw 12. Therefore, the power supply circuit 5 is accommodated in the internal space formed by the base 2 and the heat dissipation upper block 3. The material of the spacer 65 is preferably a material with good insulation, such as nylon.

  As described above, the illumination unit 1 has the same outer diameter as that of the GX53 type base, but has a large number of radial heat radiation fins 32 and 42 formed on the illumination body 10, and can obtain good heat radiation characteristics. .

Therefore, according to the lighting unit 1 of the present invention, it is possible to provide a lighting unit that is small in size, high in luminance, and excellent in light emission characteristics and durability. Furthermore, it is possible to provide a versatile lighting unit 1 that can be easily attached and detached with a GX53 type base.
[Example 2]
Next, a second embodiment of the lighting unit according to the present invention will be described. FIG. 5 is a perspective view showing the appearance of the illumination unit from the base side as in FIG.

The difference of the second embodiment from the first embodiment is that the heat dissipation characteristics are improved in order to realize the illumination unit 1 with higher brightness. In other words, although the outer size is slightly larger than that of the first embodiment, the heat radiation fins having a length that does not impair the outer shape are provided in the large diameter portion where the electrode pins are provided, and the heat radiation characteristics are further increased as compared with the first embodiment. It is in improving. Other than that, the structure, material, and function are exactly the same as those of the first embodiment, and the same constituent members are denoted by the same reference numerals, and redundant description is omitted.
[Description of Configuration of Second Embodiment: FIG. 5]
As shown in FIG. 5, the lighting unit 1 has substantially the same shape as that of the first embodiment, and includes a GX53-type base 2, a heat dissipation upper block 3, a heat dissipation lower block 4, and a cover not shown here. Inside, a circuit board on which a power supply circuit and a light emitting source are mounted is incorporated.

  In the illumination unit 1 according to the second embodiment, the heat radiation fins 36 and 46 are also formed on the outer wall surfaces of the protrusion engagement portion 35 of the heat dissipation upper block 3 and the protrusion engagement portion of the heat dissipation lower block 4. In other words, due to the presence of the heat radiation fins 36 and 46 having a short fin length, a large number of radial extensions are provided from the outer wall surfaces 31 and 41 of the heat dissipation upper block 3 and the heat dissipation lower block 4 shown in the first embodiment. As a result, the surface area of the heat radiating fins is remarkably increased.

  Therefore, since the surface area of the heat radiating fin is increased only by slightly increasing the outer diameter of the entire lighting body of the heat radiating upper block 3 and the heat radiating lower block 4, the heat radiating characteristics are further improved, and the luminance, light emitting characteristics, The durability can be improved.

  In the above invention, the embodiment of the lighting unit according to the present invention has been described in detail. However, the basic technical idea of the present invention is an electrode pin having a standardized GX53 type base and having a defined shape and dimension. It is intended to obtain good heat dissipation characteristics by narrowing the area other than the region holding the inside to ensure sufficient length of the heat dissipating fins. Therefore, it is possible to provide the lighting unit 1 having a small outer diameter, a small size, a high luminance, a good light emission characteristic and a high durability.

  In the present invention, the LED 71 of the light emission source 7 has been described as an example in which blue light emission is wavelength-converted to emit white light, but purple light emission may be wavelength-converted, and blue, red, There is no problem even if a green LED is used as a light emission source. Furthermore, although the standard of the base has been described with the example of GX53, it goes without saying that there is no problem even if it is a GU10 type.

  Moreover, it is not limited to Example 1 and Example 2 of the illumination unit 1 of this invention mentioned above, It is not necessary to perform all of them, and it is in the range of the content described in each claim of a claim. It goes without saying that various changes and omissions can be made.

1: Illumination unit 2: Base 3: Heat dissipation upper block 4: Heat dissipation lower block 5: Power supply circuit 6: Circuit board 7: Light source 8: Cover 11: Base set screw 12: Spacer screw 21: Base body 22: Projection 23: Electrode pin 24: Guide groove 31: Outer wall surface 32: Radiation fin 33: Inner wall surface 34: Inner wall projection 35: Projection engagement portion 41: Outer wall surface 42: Radiation fin 43: Inner wall surface 44: Inner wall projection 45: Projection engagement Joint portion 51: power circuit board 52: power circuit component 61: mounting surface 62: light emitting source pasting surface 63: outer edge portion 64: metal surface 71: LED
72: Sub-plate 73: FPC

Claims (5)

A circuit board on which a light source is mounted;
The circuit board and a lighting body connected by a cylindrical inner wall surface;
A plurality of heat dissipating fins extending radially from the outer wall surface of the illumination body and formed integrally with the illumination body;
In the illumination unit having an electrode pin for supplying electric power to the light emitting source on the base body, and a base provided protruding from the illumination body,
The outer shape of the base is a large-diameter shape projecting the area where the electrode pin is provided in comparison with other areas, and the other area is a small-diameter shape,
The plurality of radiating fins are formed in a small-diameter portion of the other region. The plurality of heat radiation fins are also formed in a large diameter region where the electrode pins are provided,
The lighting unit according to claim 1, wherein a fin length of the heat dissipating fin of the large diameter portion is shorter than a fin length of the small diameter portion. The illumination unit according to claim 1 or 2, wherein the illumination body includes a pair of heat dissipation blocks and sandwiches an outer edge portion of the circuit board. The lighting unit according to claim 3, wherein the circuit board is a metal substrate. The illumination unit according to any one of claims 1 to 4, wherein the base is a GX53 type base.

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