WO2014097534A1 - Illumination light source and illumination device - Google Patents

Abstract

A light-bulb-shaped lamp (1) that is one example of this illumination light source is provided with: a globe (10); a support pillar (30) that provided extending towards the inside of the globe (10); a substrate (21) connected to one end of the support pillar (30); a plurality of LEDs (light-emitting elements) (22) disposed at the substrate (21); and a support member (40) that is connected to the other end of the support pillar (30) and that supports the support pillar (30). When the area of the connection section between the support pillar (30) and the substrate (21) is A and the area of the connection section between the support pillar (30) and the support member (40) is B, B ≥ A.

Description

Illumination light source and illumination device

The present invention relates to an illumination light source and an illumination device, and more particularly, to a light bulb shaped lamp using a light emitting diode (LED) and an illumination device using the same.

Semiconductor light-emitting elements such as LEDs are expected to serve as light sources for various products because of their small size, high efficiency, and long life. Among these, a bulb-type LED lamp (LED bulb) is being developed as an illumination light source that replaces conventionally known bulb-type fluorescent lamps and incandescent bulbs (Patent Document 1).

The bulb-type LED lamp is configured to surround, for example, an LED module that serves as a light source, a globe that covers the LED module, a support member that supports the LED module, a drive circuit that supplies power to the LED module, and a drive circuit. An outer casing and a base for receiving power. The LED module includes a substrate and a plurality of LEDs (light emitting elements) mounted on the substrate.

JP 2006-313717 A

In recent years, a light bulb-type LED lamp having a configuration that imitates the light distribution characteristics and appearance of an incandescent bulb has been studied. For example, a bulb-type LED lamp having a configuration in which an LED module is held hollow at a central position in the globe using a globe (clear bulb) made of transparent glass as used in an incandescent bulb has been proposed. In this case, for example, the LED module is fixed to the top of the column using a column extending from the globe opening toward the center of the globe.

The LED mounted on the LED module generates heat from the LED itself due to light emission, which increases the temperature of the LED and decreases the light output. That is, the light emission efficiency of the LED decreases due to the heat generated by itself. For this reason, the heat dissipation countermeasure of an LED module is important.

On the other hand, light bulb-type LED lamps are required to have higher luminous flux, and research and development of high-power type LED lamps in which LEDs are frequently used are underway. For example, a bulb-type LED lamp having a brightness equivalent to 60 W has been studied. Therefore, measures for heat dissipation of the LED module are extremely important issues.

This invention was made in order to solve such a subject, and it aims at providing the light source and the illuminating device for illumination which can improve the heat dissipation of LED (light emitting element).

In order to achieve the above object, one aspect of an illumination light source according to the present invention includes a globe, a support column extending inward of the globe, a substrate connected to one end of the support column, A plurality of light emitting elements arranged on a substrate; and a support member connected to the other end of the support column and supporting the support column, wherein an area of a connection portion between the support column and the substrate is A, and When the area of the connecting portion with the support member is B, B ≧ A.

Moreover, in one aspect of the light source for illumination according to the present invention, further comprising a heat sink connected to the support member, where C ≧ A, where C is the area of the connection portion between the support member and the heat sink. It is good.

In one embodiment of the illumination light source according to the present invention, C ≧ B may be satisfied.

Further, in one aspect of the illumination light source according to the present invention, a cross-sectional area of the support may be constant.

Further, in one aspect of the illumination light source according to the present invention, when the input power to the plurality of light emitting elements is 8.5 W or more, a cross-sectional area of the support may be 175 mm ² or more.

Further, in one aspect of the illumination light source according to the present invention, the volume of the column may be 3800 mm ³ or more.

Also, in one aspect of the illumination light source according to the present invention, the support column is preferably made of a metal material.

Further, in one aspect of the illumination light source according to the present invention, a part of the plurality of light emitting elements may be located immediately above the support column.

Also, in one aspect of the illumination light source according to the present invention, the heat sink has a cylindrical shape having an opening, and the support member has the opening so that an outer periphery of the support member contacts an inner surface of the heat sink. And an insulating casing configured to surround the outer peripheral surface of the heat sink.

Further, an aspect of the illumination device according to the present invention is characterized by including any one of the above illumination light sources.

According to the present invention, the heat generated in the light emitting element can be efficiently dissipated.

FIG. 1 is an external perspective view of a light bulb shaped lamp according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the light bulb shaped lamp according to the embodiment of the present invention. FIG. 3 is a cross-sectional view of the light bulb shaped lamp according to the embodiment of the present invention. 4A is a plan view of the LED module in the light bulb shaped lamp according to the embodiment of the present invention, and FIG. 4B is a plan view of the LED module taken along the line AA ′ in FIG. 4A. FIG. 4C is a cross-sectional view of the LED module taken along line BB ′ of FIG. 4A. FIG. 5 is an enlarged cross-sectional view around the LED (LED chip) in the LED module of the light bulb shaped lamp according to the embodiment of the present invention. FIG. 6 is a perspective view showing the configuration of the support and the support member in the light bulb shaped lamp according to the embodiment of the present invention. FIG. 7 is a perspective view showing the configuration of the heat sink in the light bulb shaped lamp according to the embodiment of the present invention. FIG. 8 is a cross-sectional view showing a connection relationship among the LED module, the support column, and the support member in the light bulb shaped lamp according to the embodiment of the present invention. FIG. 9 is a perspective view showing a connection relationship among the LED module, the column, and the support member in the light bulb shaped lamp according to the embodiment of the present invention. FIG. 10 is a schematic cross-sectional view of the illumination device according to the embodiment of the present invention. FIG. 11 is a perspective view showing a configuration of a modified example of the support member in the light bulb shaped lamp according to the embodiment of the present invention.

Hereinafter, an illumination light source and an illumination device according to an embodiment of the present invention will be described with reference to the drawings. Note that each of the embodiments described below shows a preferred specific example of the present invention. Therefore, the numerical values, shapes, materials, components, component arrangement positions, connection forms, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims showing the highest concept of the present invention are described as optional constituent elements.

Each figure is a schematic diagram and is not necessarily shown strictly. Moreover, in each figure, the same code | symbol is attached | subjected about the same structural member.

In the following embodiments, a light bulb shaped LED lamp (LED light bulb) will be described as an example of a light source for illumination.

(Overall configuration of bulb-type lamp)
First, the whole structure of the light bulb shaped lamp 1 according to the present embodiment will be described with reference to FIGS. FIG. 1 is an external perspective view of a light bulb shaped lamp according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the light bulb shaped lamp according to the embodiment of the present invention. In FIG. 2, the lead wires 53a to 53d are omitted.

As shown in FIGS. 1 and 2, a light bulb shaped lamp 1 according to the present embodiment is a light bulb shaped lamp that is an alternative to a light bulb shaped fluorescent light or an incandescent light bulb, and includes a globe 10 and an LED module that is a light source. 20, a support 30, a support member 40, a drive circuit 50, a circuit case 60, a heat sink 70, an outer casing 80, and a base 90.

The bulb-type lamp 1 includes an envelope formed by the globe 10, the outer casing 80, and the base 90.

Hereinafter, each component of the light bulb shaped lamp 1 according to the present embodiment will be described in detail with reference to FIG. FIG. 3 is a cross-sectional view of the light bulb shaped lamp according to the embodiment of the present invention.

In FIG. 3, the alternate long and short dash line drawn in the vertical direction on the paper indicates the lamp axis J (center axis) of the light bulb shaped lamp 1. In the present embodiment, the lamp axis J is identical to the globe axis. I'm doing it. The lamp axis J is an axis serving as a rotation center when the light bulb shaped lamp 1 is attached to a socket of a lighting device (not shown), and coincides with the rotation axis of the base 90. Further, in FIG. 3, the drive circuit 50 is shown in a side view rather than a sectional view.

(Glove)
As shown in FIG. 3, the globe 10 is a substantially hemispherical light-transmitting cover for taking out the light emitted from the LED module 20 to the outside of the lamp. The globe 10 in the present embodiment is a glass bulb (clear bulb) made of silica glass that is transparent to visible light. Therefore, the LED module 20 housed in the globe 10 can be viewed from the outside of the globe 10.

The LED module 20 is covered with the globe 10. Thereby, the light of the LED module 20 that has entered the inner surface of the globe 10 passes through the globe 10 and is extracted to the outside of the globe 10. In the present embodiment, the globe 10 is configured to house the LED module 20.

The shape of the globe 10 is a shape in which one end is closed in a spherical shape and an opening 11 is provided at the other end. Specifically, the shape of the globe 10 is such that a part of a hollow sphere narrows while extending away from the center of the sphere, and the opening 11 is located away from the center of the sphere. Is formed. As the globe 10 having such a shape, a glass bulb having a shape similar to that of a general bulb-type fluorescent lamp or incandescent bulb can be used. For example, a glass bulb such as an A shape, a G shape, or an E shape can be used as the globe 10.

Also, the opening 11 of the globe 10 is placed on the surface of the support member 40. In this state, the globe 10 is fixed by applying an adhesive such as silicone resin between the support member 40 and the outer casing 80.

Note that the globe 10 is not necessarily transparent to visible light, and the globe 10 may have a light diffusion function. For example, a milky white light diffusing film can be formed by applying a resin containing a light diffusing material such as silica or calcium carbonate, a white pigment, or the like to the entire inner surface or outer surface of the globe 10. In this way, by providing the globe 10 with a light diffusion function, light incident on the globe 10 from the LED module 20 can be diffused, so that the light distribution angle of the lamp can be expanded.

Further, the shape of the globe 10 is not limited to the A shape, and may be a spheroid or an oblate sphere. The material of the globe 10 is not limited to a glass material, and a resin such as acrylic (PMMA) or polycarbonate (PC) may be used. In this case, the resin may contain a light diffusing material.

(LED module)
The LED module 20 is a light emitting module having a light emitting element, and emits light of a predetermined color (wavelength) such as white. As shown in FIG. 3, the LED module 20 is disposed on the inner side of the globe 10, and has a spherical center position formed by the globe 10 (for example, inside the large diameter portion where the inner diameter of the globe 10 is large). Preferably they are arranged. Thus, by arranging the LED module 20 at the center position of the globe 10, it is possible to realize a light distribution characteristic approximate to that of an incandescent bulb using a conventional filament coil.

The LED module 20 is held hollow in the globe 10 by the support column 30 and emits light by the electric power supplied from the drive circuit 50 via the lead wires 53a and 53b. In the present embodiment, the substrate 21 of the LED module 20 is supported by the support column 30.

Here, each component of the LED module 20 which concerns on embodiment of this invention is demonstrated using FIG. 4A is a plan view of the LED module in the light bulb shaped lamp according to the embodiment of the present invention, and FIG. 4B is a plan view of the LED module taken along the line AA ′ in FIG. 4A. It is sectional drawing. FIG. 4C is a cross-sectional view of the LED module taken along line B-B ′ of FIG.

4A to 4C, the LED module 20 includes a substrate 21, an LED 22, a sealing member 23, a metal wiring 24, a wire 25, and terminals 26a and 26b. The LED module 20 in the present embodiment has a COB (Chip On Board) structure in which a bare chip is directly mounted on the substrate 21. Hereinafter, each component of the LED module 20 will be described in detail.

First, the substrate 21 will be described. The substrate 21 is a mounting substrate for mounting the LEDs 22, and includes a first main surface (front side surface) on which the LEDs 22 are mounted, and a second main surface (back side surface) facing the first main surface. Have As shown in FIG. 4A, the substrate 21 is, for example, a rectangular plate-like substrate that is rectangular in plan view (when viewed from the top of the globe 10).

The substrate 21 is connected to one end of the support column 30. Specifically, the second main surface of the substrate 21 and the first fixed surface 30a of the support column 30 are connected so as to be in surface contact.

As the substrate 21, a substrate having a low light transmittance with respect to the light emitted from the LED 22, for example, a white substrate such as a white alumina substrate having a total transmittance of 10% or less or a metal substrate (metal base substrate) coated with a resin is used. Can be used. Thus, by using a substrate having a low light transmittance, it is possible to suppress light from being transmitted through the substrate 21 and emitted from the second main surface, and color unevenness can be suppressed. Further, since an inexpensive white substrate can be used, cost reduction can be realized.

On the other hand, a translucent substrate having a high light transmittance can be used as the substrate 21. By using the translucent substrate, the light of the LED 22 is transmitted through the inside of the substrate 21 and is also emitted from the surface (back side surface) on which the LED 22 is not mounted. Therefore, even if the LED 22 is mounted only on the first main surface (front side surface) of the substrate 21, light is emitted from the second main surface (back side surface), so that the light distribution approximates that of an incandescent bulb. It becomes possible to obtain characteristics. Moreover, since light can be emitted from the LED module 20 in all directions, it is possible to realize all light distribution characteristics.

As the light-transmitting substrate, for example, a substrate having a total transmittance of 80% or more for visible light, or a transparent substrate that is transparent to visible light (that is, the transmittance is extremely high and the other side can be seen through) is used. Can do. As such a translucent substrate, a translucent ceramic substrate made of polycrystalline alumina or aluminum nitride, a transparent glass substrate made of glass, a quartz substrate made of crystal, a sapphire substrate made of sapphire, or a transparent resin material made of transparent resin material A resin substrate or the like can be used.

In the present embodiment, a white polycrystalline ceramic substrate made of sintered alumina is used as the light-transmitting substrate 21. For example, a white alumina substrate having a thickness of 1 mm and a light reflectance of 94%, or a white alumina substrate having a thickness of 0.635 mm and a light reflectance of 88% can be used.

In addition, as the substrate 21, a resin substrate, a flexible substrate, or a metal base substrate can be used. In addition, the shape of the substrate 21 is not limited to a rectangle, and other shapes such as a square or a circle can be used.

The substrate 21 is provided with two through holes 27a and 27b for electrical connection with the two lead wires 53a and 53b. The lead wire 53a (53b) is solder-connected to a terminal 26a (26b) formed on the substrate 21 with the tip portion inserted through the through hole 27a (27b).

Next, the LED 22 will be described. The LED 22 is an example of a light emitting element, and is a semiconductor light emitting element that emits light with a predetermined power. The plurality of LEDs 22 on the substrate 21 are all the same, and the LEDs 22 are selected so that the Vf characteristics are all the same. Each LED 22 is a bare chip that emits monochromatic visible light. In this embodiment, a blue LED chip that emits blue light when energized is used. As the blue LED chip, for example, a gallium nitride based semiconductor light emitting device having a central wavelength of 440 nm to 470 nm, which is made of an InGaN based material, can be used.

Further, the LEDs 22 are mounted only on the first main surface (front side surface) of the substrate 21, and a plurality of LEDs 22 are mounted so as to form a plurality of rows along the long side direction of the substrate 21. In the present embodiment, in order to achieve brightness equivalent to 60 W, 48 LEDs 22 are connected in 12 rows and 4 rows, and one row is provided so that four rows of element rows each consisting of 12 LEDs 22 are arranged in parallel. ing.

In the present embodiment, a plurality of LEDs 22 are mounted. However, the number of mounted LEDs 22 may be appropriately changed according to the use of the light bulb shaped lamp. For example, in the case of a low output type LED lamp that replaces a miniature light bulb or the like, the number of LEDs 22 may be one. On the other hand, in the case of a high-output type LED lamp, the number of LEDs 22 mounted in one element row may be further increased. Further, the element rows of the LED 22 are not limited to four rows, but may be one to three rows or five or more rows.

Further, the plurality of LEDs 22 mounted on the substrate 21 may be arranged so that some of them are located immediately above the support column 30. In this case, it is preferable that half or more of the plurality of LEDs 22 is located immediately above the support column 30. That is, as shown in FIG. 4A, it is preferable that more than half of the LEDs 22 are arranged so as to overlap the support column 30 in plan view. By disposing the LEDs 22 in this manner, the heat dissipation of the LED module 20 as a whole can be improved.

Here, the LED 22 used in the present embodiment will be described with reference to FIG. FIG. 5 is an enlarged cross-sectional view around the LED (LED chip) in the LED module of the light bulb shaped lamp according to the embodiment of the present invention.

As shown in FIG. 5, the LED 22 includes a sapphire substrate 22a and a plurality of nitride semiconductor layers 22b having different compositions stacked on the sapphire substrate 22a.

A cathode electrode 22c and an anode electrode 22d are provided at both ends of the upper surface of the nitride semiconductor layer 22b. Wire bond portions 22e and 22f are provided on the cathode electrode 22c and the anode electrode 22d, respectively.

In the adjacent LEDs 22, each of the cathode electrode 22 c of one LED 22 and the anode electrode 22 d of the other LED 22 is connected to the metal wiring 24 by a wire 25 by wire bonding. In addition, as will be described later, the electrodes of adjacent LEDs 22 may be directly connected by a wire 25 without using the metal wiring 24.

Each LED 22 is mounted on the substrate 21 with a translucent chip bonding material 22g so that the surface on the sapphire substrate 22a side faces the first main surface of the substrate 21. For the chip bonding material 22g, a silicone resin containing a filler made of metal oxide can be used. By using a translucent material for the chip bonding material 22g, the loss of light emitted from the side surface of the LED 22 can be reduced, and the generation of shadows by the chip bonding material 22g can be suppressed.

Returning to FIG. 4, the sealing member 23 will be described next. The sealing member 23 is made of resin, for example, and is formed on the substrate 21 so as to cover the LEDs 22. The sealing member 23 is formed so as to collectively seal one row of the plurality of LEDs 22. In the present embodiment, since four element rows of the LED 22 are provided, four sealing members 23 are formed. Each of the four sealing members 23 is linearly provided on the first main surface of the substrate 21 along the arrangement direction (column direction) of the plurality of LEDs 22.

The sealing member 23 is mainly made of a translucent material. However, when it is necessary to convert the wavelength of light of the LED 22 to a predetermined wavelength, a wavelength conversion material is mixed into the translucent material.

The sealing member 23 in the present embodiment is a wavelength conversion member that includes a phosphor as a wavelength conversion material and converts the wavelength (color) of light emitted from the LED 22. Such a sealing member 23 can be constituted by, for example, an insulating resin material (phosphor-containing resin) containing phosphor particles. The phosphor particles are excited by light emitted from the LED 22 and emit light of a desired color (wavelength).

As the resin material constituting the sealing member 23, for example, a silicone resin can be used. Further, a light diffusing material may be dispersed in the sealing member 23. The sealing member 23 is not necessarily formed of a resin material, and may be formed of an inorganic material such as a low-melting glass or a sol-gel glass in addition to an organic material such as a fluorine-based resin.

As the phosphor particles to be contained in the sealing member 23, for example, when the LED 22 is a blue LED that emits blue light, for example, YAG-based yellow phosphor particles can be used to obtain white light. Thereby, a part of the blue light emitted from the LED 22 is converted into yellow light by the yellow phosphor particles contained in the sealing member 23. Then, the blue light that has not been absorbed by the yellow phosphor particles and the yellow light that has been wavelength-converted by the yellow phosphor particles are diffused and mixed in the sealing member 23, so that white light is emitted from the sealing member 23. And emitted. In addition, particles such as silica are used as the light diffusing material.

The sealing member 23 in the present embodiment is a phosphor-containing resin in which predetermined phosphor particles are dispersed in a silicone resin, and is formed by applying and curing the first main surface of the substrate 21 with a dispenser. Can do. In this case, the shape of the cross section perpendicular to the longitudinal direction of the sealing member 23 is substantially semicircular.

Note that the sealing member 23 may be formed so as not to be linear but to be rectangular in plan view. In this case, for example, the sealing member 23 may be formed so as to collectively seal all the LEDs 22 on the substrate 21. Alternatively, the sealing member 23 may be formed so as to cover each LED 22 individually. In this case, the sealing member 23 can be formed in a substantially hemispherical shape, for example.

Further, in order to convert the wavelength of light (leakage light) toward the back surface side of the substrate 21, fluorescence between the LED 22 and the substrate 21 or the second main surface (back side surface) of the substrate 21 as a second wavelength conversion member. A phosphor-containing resin (phosphor layer) such as a sintered body film composed of body particles and an inorganic binder (binder) such as glass or the same phosphor-containing resin as the surface of the substrate 21 may be further formed. In this manner, by forming the second wavelength conversion member on the second main surface of the substrate 21, white light can be emitted from both surfaces of the substrate 21 even when light leaks from the second main surface. it can.

Next, the metal wiring 24 will be described. The metal wiring 24 is a conductive wiring through which a current for causing the LED 22 to emit light flows, and is patterned in a predetermined shape on the surface of the substrate 21. As shown in FIG. 4A, the metal wiring 24 is formed on the first main surface of the substrate 21. The power supplied to the LED module 20 from the lead wires 53 a and 53 b is supplied to each LED 22 by the metal wiring 24.

The metal wiring 24 is formed to connect a plurality of LEDs 22 in each LED element row in series. For example, the metal wiring 24 is formed in an island shape between the adjacent LEDs 22. The metal wiring 24 is formed to connect the element rows in parallel. Each LED 22 is electrically connected to the metal wiring 24 via a wire 25. Note that the island-like metal wiring 24 between the LEDs 22 may not be provided. in this case. Adjacent LEDs 22 are wire-bonded by chip-to-chip.

The metal wiring 24 can be formed, for example, by patterning or printing a metal film made of a metal material. As the metal material of the metal wiring 24, for example, silver (Ag), tungsten (W), copper (Cu), gold (Au), or the like can be used.

The metal wiring 24 exposed from the sealing member 23 is preferably covered with a glass film (glass coat film) made of a glass material or a resin film (resin coat film) made of a resin material, except for the terminals 26a and 26b. . Thereby, the insulation in the LED module 20 can be improved, and the reflectance of the surface of the board | substrate 21 can be improved.

The wire 25 is an electric wire such as a gold wire. As shown in FIG. 4B, the wire 25 connects the LED 22 and the metal wiring 24. As described with reference to FIG. 5, the wire 25 connects the cathode electrode 22 c (or the anode electrode 22 d) provided on the upper surface of the LED 22 and the metal wiring 24 formed adjacent to both sides of the LED 22 to the wire bond portion 22 e (or 22f) and wire bonding is performed.

Note that, as in the present embodiment, the entire wire 25 is embedded in the sealing member 23 so as not to be exposed from the sealing member 23. Thereby, light can be prevented from being absorbed or reflected by the exposed wire 25.

Next, the terminals 26a and 26b will be described. The terminals 26 a and 26 b are external connection terminals for receiving DC power for causing the LEDs 22 to emit light from the outside of the LED module 20. In the present embodiment, the terminals 26a and 26b are soldered to the lead wires 53a and 53b.

The terminals 26a and 26b are formed in a predetermined shape on the first main surface of the substrate 21 so as to surround the through holes 27a and 27b. The terminals 26 a and 26 b are formed continuously with the metal wiring 24 and are electrically connected to the metal wiring 24. The terminals 26 a and 26 b are patterned simultaneously with the metal wiring 24 using the same metal material as the metal wiring 24.

Further, the terminals 26 a and 26 b are power supply units of the LED module 20, and DC power received from the lead wires 53 a and 53 b is supplied to each LED 22 via the metal wiring 24 and the wire 25.

(Support)
As shown in FIG. 3, the support column 30 is a long member extending from the vicinity of the opening 11 of the globe 10 toward the inside of the globe 10. In the present embodiment, the support column 30 has the axis of the support column 30 extended along the lamp axis J. That is, the axis of the support column 30 and the lamp axis J are parallel.

The support column 30 functions as a support member that supports the LED module 20, and the LED module 20 is connected to one end of the support column 30. Thus, by attaching the LED module 20 to the support column 30 extending inward of the globe 10, it is possible to realize a light distribution characteristic with a wide light distribution angle similar to that of an incandescent bulb. On the other hand, a support member 40 is connected to the other end of the column 30.

Moreover, the support | pillar 30 functions also as a heat radiating member (heat sink) for radiating the heat which generate | occur | produces in the LED module 20 (LED22). Therefore, it is preferable that the support column 30 is made of a metal material mainly composed of aluminum (Al), copper (Cu), iron (Fe), or the like, or a resin material having high thermal conductivity. Thereby, the heat generated in the LED module 20 via the support column 30 can be efficiently conducted to the support member 40. The thermal conductivity of the support column 30 is preferably larger than the thermal conductivity of the substrate 21. In the present embodiment, the support column 30 is formed using aluminum.

The support column 30 is configured to be sandwiched between the LED module 20 and the support member 40. One end of the column 30 on the top side of the globe 10 is connected to the center of the substrate 21 of the LED module 20, and the other end of the column 30 on the base side is connected to the center of the support member 40.

Here, the detailed configuration of the support column 30 will be described with reference to FIG. FIG. 6 is a perspective view showing the configuration of the support and the support member in the light bulb shaped lamp according to the embodiment of the present invention.

As shown in FIG. 6, a first fixing surface 30 a to which the substrate 21 is fixed is formed at one end of the support column 30 as a connection portion with the substrate 21 of the LED module 20. In the present embodiment, the first fixed surface 30 a is a contact surface that contacts the second main surface (back surface) of the substrate 21.

The substrate 21 of the LED module 20 and the first fixed surface 30a of the support column 30 are fixed by an adhesive such as silicone resin, for example. Therefore, an adhesive may exist between the substrate 21 and the first fixing surface 30a. In this case, considering the thermal conductivity between the substrate 21 and the support column 30, the thickness of the silicone resin is preferably 20 μm or less.

Further, the substrate 21 and the support column 30 may be fixed by screws instead of an adhesive. In this case, there may be minute irregularities on the surface of the substrate 21 and the support column 30 depending on the material and processing, and there is a minute gap between the second main surface of the substrate 21 and the first fixed surface 30a of the support column 30. Sometimes. Even if there is such a small gap, if the gap is about 20 μm or less, it can be considered that the substrate 21 and the support column 30 are in contact with each other.

On the other hand, a second fixing surface 30 b to which the support member 40 is fixed is formed at the other end of the support column 30 as a connection portion with the support member 40. In the present embodiment, the second fixed surface 30 b is a contact surface that contacts the surface of the support member 40. The support member 40 and the support column 30 can be fixed by using, for example, a fixing member such as an adhesive or a screw, or by press-fitting the support column 30 into the support member 40. The contact between the support column 30 and the support member 40 can be considered in the same manner as the contact between the substrate 21 and the support column 30. If the clearance is about 20 μm or less, the support column 30 and the support member 40 are in contact with each other. Can be considered.

As the support column 30, as shown in FIG. 6, a solid-structured cylinder having a constant cross-sectional area (area in a cross section when cut along a plane having the axis of the support column 30 as a normal line) can be used. That is, the arbitrary cross-sectional area of the support column 30 is the same, and the cross-sectional area of the support column 30 is constant regardless of the position in the longitudinal direction of the support column 30. In this case, the 1st fixed surface 30a and the 2nd fixed surface 30b are circular, and the area is the same. In addition, the support | pillar 30 in this Embodiment is a cylinder with a diameter of 15 mm.

In addition, about the shape of the support | pillar 30, not only a thing with a fixed cross-sectional area but the shape where a cross-sectional area changes in the middle, such as what combined a cylinder and a prism, may be sufficient. However, in this case, the cross-sectional area in an arbitrary cross section of the support column 30 is equal to or larger than the area (A) of the connection portion between the support column 30 and the substrate 21, and the product of the thermal conductivity of the support column 30 and the cross-sectional area of the support column 30 is 0. It is preferable to satisfy any one of the following conditions: 0.01 [m · W / K] or more. The reason why the thermal conductivity of the column 30 × the cross-sectional area of the column 30 ≧ 0.01 [m · W / K] is that when the input power to the LED module 20 is 10 W, the temperature difference is 10 mm within 10 mm. Considering the limit value of not exceeding ℃.

(Support member)
The support member 40 is a support base that supports the support column 30. As shown in FIG. 3, the support member 40 is configured to close the opening 11 of the globe 10. The support member 40 is connected to the heat sink 70. In the present embodiment, the support member 40 is fitted into the first opening 70 a of the heat sink 70 so that the outer periphery of the support member 40 contacts the inner surface of the heat sink 70.

The support member 40 also functions as a heat radiating member (heat sink) for radiating heat generated in the LED module 20 (LED 22). Therefore, the support member 40 is preferably composed of a metal material mainly composed of aluminum (Al), copper (Cu), iron (Fe), or the like, or a resin material having high thermal conductivity. Thereby, the heat from the column 30 can be efficiently conducted to the heat sink 70. In the present embodiment, the support member 40 is formed using aluminum.

Here, a detailed configuration of the support member 40 will be described with reference to FIGS. As shown in FIGS. 3 and 6, the support member 40 is a disk-shaped member having a stepped portion, and includes a small-diameter portion 41 having a small diameter and a large-diameter portion 42 having a large diameter. Further, the small-diameter portion 41 and the large-diameter portion 42 constitute a step portion. For example, the small-diameter portion 41 can have a thickness of 3 mm and a diameter of about 18 mm, and the large-diameter portion 42 can have a thickness of 3 mm and a diameter of about 42 mm. Note that the height of the stepped portion can be about 4 mm, for example.

The small diameter portion 41 constitutes a connection portion with the support column 30, and the support column 30 is connected to the upper surface of the central portion of the small diameter portion 41. The small diameter portion 41 is provided with two through holes for inserting the lead wires 53a and 53b.

The large diameter portion 42 constitutes a connection portion with the heat sink 70 and is fitted with the heat sink 70. As shown in FIG. 3, the support member 40 is fitted into the first opening 70 a of the heat sink 70 so that the outer peripheral surface of the large diameter portion 42 is in contact with the inner peripheral surface of the heat sink 70. Thereby, the heat of the support member 40 can be efficiently conducted to the heat sink 70.

The large diameter portion 42 is formed with four concave portions 42a as guide holes for caulking a part of the heat sink 70. The concave portion 42 a is formed so as to cut out a part of the upper end portion of the large diameter portion 42. The opening 11 of the globe 10 abuts on the upper surface of the large-diameter portion 42, and the opening 11 of the globe 10 is closed. Note that the support member 40 and the heat sink 70 can be fixed using an adhesive such as silicone resin, instead of being fixed by caulking.

(Drive circuit)
As shown in FIG. 3, the drive circuit (circuit unit) 50 is a lighting circuit for causing the LED module 20 (LED 22) to emit light (lights), and supplies predetermined power to the LED module 20. For example, the drive circuit 50 converts AC power supplied from the base 90 via the pair of lead wires 53c and 53d into DC power, and the DC power is supplied to the LED module 20 via the pair of lead wires 53a and 53b. It is a power supply circuit for supplying.

The drive circuit 50 includes a circuit board 51 and a plurality of circuit elements (electronic components) 52 mounted on the circuit board 51.

The circuit board 51 is a printed wiring board on which metal wiring is patterned, and electrically connects a plurality of circuit elements 52 mounted on the circuit board 51. In the present embodiment, the circuit board 51 is arranged in a posture in which the main surface is orthogonal to the lamp axis J.

The circuit element 52 is, for example, a capacitance element such as an electrolytic capacitor or a ceramic capacitor, a resistance element, a rectifier circuit element, a coil element, a choke coil (choke transformer), a noise filter, a semiconductor element such as a diode or an integrated circuit element. Many of the circuit elements 52 are mounted on the main surface of the circuit board 51 on the base side.

The drive circuit 50 configured as described above is housed in the circuit case 60. In the present embodiment, the circuit board 51 is placed on a protruding part (board holding part) provided on the inner surface of the case body 61, and the main surface of the circuit board 51 is provided on the cap part 62. The protrusion is in contact. Thereby, the circuit board 51 is held by the circuit case 60. The drive circuit 50 may be appropriately selected and combined with a dimmer circuit, a booster circuit, or the like.

The drive circuit 50 and the LED module 20 are electrically connected by a pair of lead wires 53a and 53b. The drive circuit 50 and the base 90 are electrically connected by a pair of lead wires 53c and 53d. These four lead wires 53a to 53d are, for example, alloy copper lead wires, and are composed of a core wire made of alloy copper and an insulating resin film covering the core wire.

In the present embodiment, the lead wire 53a is a conducting wire (plus output terminal wire) for supplying a high voltage (positive voltage) from the drive circuit 50 to the LED module 20, and the lead wire 53b is the drive circuit 50. This is a conducting wire (minus-side output terminal wire) for supplying a low-voltage side voltage (negative voltage) to the LED module 20. The lead wires 53a and 53b are inserted into through holes provided in the support member 40 and drawn out to the LED module side (inside the globe 10).

Note that one end (core wire) of each of the lead wires 53a (53b) is inserted into the through hole 27a (27b) of the substrate 21 of the LED module 20 and soldered to the terminals 26a and 26b. On the other hand, the other end (core wire) of each of the lead wires 53a and 53b is electrically connected to the metal wiring of the circuit board 51 by solder or the like.

Further, the lead wires 53c and 53d are electric wires for supplying the power for lighting the LED module 20 from the base 90 to the drive circuit 50. One end (core wire) of each of the lead wires 53c and 53d is electrically connected to the base 90 (shell portion 91 or eyelet portion 93), and each other end (core wire) is a power input portion of the circuit board 51. It is electrically connected to (metal wiring) by solder or the like.

(Circuit case)
As shown in FIG. 3, the circuit case 60 is an insulating case for housing the drive circuit 50 and is configured to surround the drive circuit 50. The circuit case 60 is housed in the heat sink 70 and the base 90. In the present embodiment, the circuit case 60 is composed of a case body 61 and a cap 62.

The case body 61 is an insulating case (housing) having openings on both sides. Protruding portions (substrate holding portions) are provided at a plurality of locations (for example, 3 locations) on the inner surface of the case body 61 in order to place the circuit board 51. The case main body 61 can be configured using, for example, an insulating resin material such as polybutylene terephthalate (PBT).

In the present embodiment, the case main body 61 has a large-diameter cylindrical first case 61 a that is substantially the same shape as the heat sink 70, and a small-diameter cylindrical shape that is connected to the first case 61 a and substantially the same shape as the base 90. It is comprised with the 2nd case part 61b.

The first case portion 61 a located on the globe side is housed in the heat sink 70. Most of the drive circuit 50 is covered by the first case portion 61a.

On the other hand, the second case portion 61b located on the base side is accommodated in the base 90, and the base 90 is fitted on the second case portion 61b. As a result, the opening on the base side of the circuit case 60 (case body 61) is closed. In the present embodiment, a screwing portion for screwing with the base 90 is formed on the outer peripheral surface of the second case portion 61b, and the base case 90 is screwed into the second case portion 61b, whereby the circuit case 60 ( It is fixed to the case body 61).

The cap part 62 is an insulating substantially bottomed cylindrical member configured in a cap shape. Similarly to the case body 61, the cap 62 can also be configured using an insulating resin material such as PBT, for example. A plurality of protrusions that protrude toward the main surface of the circuit board 51 are provided on the inner surface of the lid part of the cap part 62. When the cap part 62 is fitted into the case body part 61, the tip of the protrusion of the cap part 62 comes into contact with the main surface of the circuit board 51.

In the present embodiment, the circuit case 60 is provided with the cap portion 62. However, the circuit case 60 may be configured only by the case main body portion 61 without providing the cap portion 62.

(heatsink)
The heat sink 70 is a heat radiating member and is connected to the support member 40. Thereby, the heat generated in the LED module 20 is conducted to the heat sink 70 via the support column 30 and the support member 40. Thereby, the heat of the LED module 20 can be radiated.

In the present embodiment, the heat sink 70 is configured to surround the drive circuit 50. That is, the drive circuit 50 is disposed inside the heat sink 70. Since the drive circuit 50 is surrounded by the circuit case 60, the heat sink 70 is configured to surround the circuit case 60. Thereby, the heat sink 70 can also dissipate heat generated in the drive circuit 50.

Further, in the present embodiment, the heat sink 70 extends to the boundary portion between the first case portion 61a and the second case portion 61b of the circuit case 60.

The heat sink 70 is preferably made of a material having high thermal conductivity, and can be a metal member made of metal, for example. The heat sink 70 in the present embodiment is formed using aluminum. The heat sink 70 may be formed using a non-metallic material such as a resin instead of a metal. In this case, the heat sink 70 is preferably made of a nonmetallic material having high thermal conductivity.

In the present embodiment, the heat sink 70 is configured to be fitted with the support member 40. In this embodiment, the inner peripheral surface of the heat sink 70 and the outer peripheral surface of the support member 40 are surfaces in the entire circumferential direction. In contact.

Here, a detailed configuration of the heat sink 70 will be described with reference to FIG. FIG. 7 is a perspective view showing the configuration of the heat sink in the light bulb shaped lamp according to the embodiment of the present invention.

As shown in FIG. 7, the heat sink 70 is a cylindrical body having an opening (first opening) 70a on the glove side and an opening (second opening) 70b on the base side, and the opening 70a on the glove side. Is configured to be larger than the opening 70b on the base side. Specifically, the heat sink 70 is a substantially cylindrical member having a constant thickness and an inner diameter and an outer diameter that gradually change. For example, the heat sink 70 is configured in a skirt shape so that the inner surface and the outer surface are surfaces of a truncated cone. The heat sink 70 in the present embodiment is configured such that the inner diameter and the outer diameter become smaller from the first opening 70a toward the second opening 70b. Therefore, the inner peripheral surface and the outer peripheral surface of the heat sink 70 are tapered surfaces (inclined surfaces) configured to be inclined with respect to the lamp axis J.

The heat sink 70 configured as described above is provided between the circuit case 60 and the outer casing 80 so as to leave a predetermined gap between the circuit case 60 (first case portion 61a) and the outer casing 80. Has been placed. That is, there is an air layer between the inner peripheral surface of the heat sink 70 and the outer peripheral surface of the circuit case (first case portion 61a) and between the outer peripheral surface of the heat sink 70 and the inner peripheral surface of the outer casing 80. Exists. Thus, when the circuit case 60 or the outer casing 80 and the heat sink 70 are in contact with each other, the circuit case 60 or the outer casing 80 is caused by the difference in linear expansion coefficient between the circuit case 60 or the outer casing 80 and the heat sink 70. The crack which generate | occur | produces in can be suppressed.

Further, as shown in FIG. 7, in the present embodiment, the heat sink 70 has a bent portion provided so as to be bent inward of the cylindrical member of the heat sink 70. The bent portion of the heat sink 70 is provided at the opening end of the cylindrical member of the heat sink 70 on the base side. Further, as shown in FIG. 3, the outer casing 80 also has a bent portion provided so as to be bent inward of the cylindrical member of the outer casing 80. Furthermore, the circuit case 60 also has a bent portion provided so as to bend inward of the cylindrical member of the circuit case 60. The bent portion of the heat sink 70 is sandwiched between the bent portion of the outer casing 80 and the bent portion of the circuit case 60.

(Outer housing)
As shown in FIG. 3, the outer casing 80 is an outer member configured to surround the periphery of the heat sink 70. The outer surface of the outer casing 80 is exposed outside the lamp (in the atmosphere). The outer casing 80 is an insulating cover having an insulating property made of an insulating material. By covering the metal heat sink 70 with the insulating outer casing 80, the insulating property of the light bulb shaped lamp 1 can be improved. The outer casing 80 can be made of an insulating resin material such as PBT, for example.

The outer casing 80 is a substantially cylindrical member having a constant thickness and an inner diameter and an outer diameter that gradually change. For example, the outer casing 80 can be configured in a skirt shape so that the inner surface and the outer surface are surfaces of a truncated cone. In the present embodiment, the outer casing 80 is configured such that the inner diameter and outer diameter gradually decrease toward the base side.

(Base)
The base 90 is a power receiving unit that receives power for causing the LED module 20 (LED 22) to emit light from the outside of the lamp. The base 90 is attached to a socket of a lighting fixture, for example. Thereby, the base 90 can receive electric power from the socket of the lighting fixture when lighting the light bulb shaped lamp 1. The base 90 is supplied with AC power from, for example, a commercial power supply of AC 100V. The base 90 in the present embodiment receives AC power through two contact points, and the power received by the base 90 is input to the power input unit of the drive circuit 50 via the pair of lead wires 53c and 53b.

The base 90 has a metal bottomed cylindrical shape, and includes a shell portion 91 whose outer peripheral surface is a male screw, and an eyelet portion 93 attached to the shell portion 91 via an insulating portion 92. On the outer peripheral surface of the base 90, a screwing portion for screwing into the socket of the lighting fixture is formed. Further, on the inner peripheral surface of the base 90, a screwing portion for screwing with the screwing portion of the case main body portion 61 (second case portion 61b) of the circuit case 60 is formed.

The type of the base 90 is not particularly limited, but in the present embodiment, a screwed-type Edison type (E type) base is used. For example, as the base 90, an E26 type, an E17 type, an E16 type, or the like can be given. The base 90 may be another type of base such as a plug-type base.

(Characteristic configuration of the present invention)
Hereinafter, features of the light bulb shaped lamp 1 according to the present embodiment will be described with reference to FIGS. 8 and 9. 8 and 9 are diagrams showing a connection relationship among the LED module, the support column, and the support member in the light bulb shaped lamp according to the embodiment of the present invention. FIG. 8 is a cross-sectional view, and FIG. 9 is a perspective view.

As described above, since the luminous efficiency of the LED is lowered by the heat generated by the LED itself, it is important to take measures for heat radiation of the LED module. In particular, in a high-power type light bulb-type LED lamp that requires a brightness equivalent to 60 W or more, for example, measures for heat radiation of the LED module 20 are extremely important.

Here, in the light bulb shaped lamp 1 according to the present embodiment, as shown in FIGS. 8 and 9, the LED module 20 is fixed to a support column 30 supported by a support member 40. That is, the substrate 21 is connected to one end of the long column 30 and the support member 40 is connected to the other end of the column 30.

As described above, in this embodiment, the support column 30 having a smaller cross-sectional area than the area of the second main surface of the substrate 21 and the area of the upper surface of the support member 40 is provided between the LED module 20 and the support member 40. It has a structure. That is, when the heat dissipation path from the LED module 20 to the support member 40 is considered, the support 30 has a cross-sectional area narrowed. Thus, when the cross-sectional area becomes small in the middle of the heat dissipation path, it becomes a thermal resistance and the heat transfer efficiency decreases.

In this case, in order to improve the heat dissipation of the LED module 20, it is conceivable to increase the surface area of the heat dissipation member of the support column 30 or the support member 40. However, since convection hardly occurs in the globe 10, the heat of the LED module 20 cannot be efficiently radiated only by increasing the surface area of the heat radiating member in the globe 10.

Therefore, as a result of intensive studies by the inventors of the present application, paying attention to the area of the support column 30 that connects the LED module 20 and the support member 40, the heat input side area and the exhaust heat side area of the support column 30 have a predetermined relationship. It discovered that the heat dissipation of the LED module 20 can be improved by comprising so that it may satisfy | fill.

Specifically, as shown in FIGS. 8 and 9, assuming that the area of the connection portion between the support column 30 and the substrate 21 is A and the area of the connection portion between the support column 30 and the support member 40 is B, B ≧ A It is configured to satisfy the relationship.

In the present embodiment, the connection portion between the support column 30 and the substrate 21 is a contact surface between the support column 30 and the substrate 21. Here, since the area of the portion in contact with the support column 30 in the substrate 21 (area of the second main surface) is larger than the area of the portion in contact with the substrate 21 in the support column 30 (area of the first fixed surface 30a), the support column 30 and the substrate The contact surface with 21 becomes the first fixed surface 30 a of the support column 30.

Similarly, the connection portion between the support column 30 and the support member 40 is a contact surface between the support column 30 and the substrate 21. Here, since the area of the portion in contact with the support 30 in the support member 40 (upper plane of the small diameter portion 41) is larger than the area of the portion in contact with the support member 40 in the support 30 (second fixed surface 30b), The contact surface with the support member 40 is the second fixed surface 30 b of the support column 30.

Therefore, in the present embodiment, the area of the first fixed surface 30a is A, the area of the second fixed surface 30b is B, and B ≧ A. That is, in the support column 30, the area of the side that exhausts heat from the support column 30 to the support member 40 (exhaust heat side) is equal to or larger than the area of the side that inputs heat from the LED module 20 to the support column 30 (heat input side). In FIGS. 8 and 9, the area (A) of the first fixed surface 30a and the area (B) of the second fixed surface 30b are the same.

By satisfying such a relational expression, the heat conduction path from the LED module 20 to the support member 40 is good even in a structure in which the cross-sectional area of the column 30 is reduced in the middle and the thermal resistance is partially increased. Can be. That is, the heat dissipation performance (heat extraction performance) of the support column 30 as a heat dissipation member can be improved. Thereby, the heat of the LED module 20 (LED22) conducted to the support column 30 can be efficiently conducted to the support member 40. Therefore, the heat dissipation of the LED module 20 (LED22) can be improved.

As shown in FIG. 4, a white alumina ceramic substrate is used as the substrate 21, and the LEDs 22 are arranged in 12 rows and 4 rows, aluminum columns having a diameter of 15 mm are used as the support columns 30, and the structure shown in FIG. When the LED module 20 is turned on by forming the light bulb shaped lamp 1 by using aluminum with a portion 41: a thickness of 3 mmφ18 mm and a large diameter portion 42: a thickness of 3 mmφ42 mm, the junction temperature Tj of the LED 22 is about 125 ° C. The temperature of the substrate 21 was about 110 ° C., the temperature of the support column 30 was about 95 ° C., and the temperature of the heat sink 70 was about 90 ° C. Thus, in the present embodiment, it has been found that a desired heat conduction path can be realized by the support 30. Furthermore, it was found that the temperature difference between the substrate 21 and the heat sink 70 can be suppressed to 20 ° C.

Further, in the present embodiment, it is preferable to configure so that the relationship of C ≧ A is satisfied, where C is the area of the connection portion between the support member 40 and the heat sink 70.

In the present embodiment, the connection portion between the support member 40 and the heat sink 70 is a contact surface between the outer peripheral surface of the support member 40 and the inner peripheral surface of the heat sink 70. Here, since the area of the portion of the support member 40 that contacts the heat sink is larger than the area of the portion of the heat sink 70 that contacts the support member 40, the contact surface between the support column 30 and the heat sink 70 becomes the outer peripheral surface of the support member 40.

Therefore, the area of the outer peripheral surface of the support member 40 is C, and the relationship of C ≧ A is satisfied. That is, in the heat radiating member composed of the support column 30 and the support member 40, the area on the side that exhausts heat from the heat radiating member to the heat sink 70 (heat exhaust side) is the side that receives heat from the LED module 20 (heat input). Heat area) or more.

By satisfying such a relational expression, the heat conduction path in the support column 30 and the support member 40 can be improved. That is, the heat-drawing performance of the support columns 30 and the support members 40 as heat radiating members can be improved. Thereby, the heat of the LED module 20 (LED22) conducted to the support column 30 and the support member 40 can be efficiently conducted to the heat sink 70. Therefore, the heat dissipation of the LED module 20 (LED22) can be improved.

Further, in the present embodiment, it is further preferable to configure so as to satisfy the relationship of C ≧ B. That is, in the support member 40, the area of the side that exhausts heat from the support member 40 to the heat sink 70 (heat exhaust side) is larger than the area of the side that inputs heat from the support column 30 to the support member 40 (heat input side). Yes.

By satisfying such a relational expression, the heat conduction path in the support member 40 can be improved. That is, the heat drawing performance of the support member 40 as a heat radiating member can be improved. Thereby, the heat of the LED module 20 (LED 22) conducted from the support column 30 to the support member 40 can be efficiently conducted to the heat sink 70. Therefore, the heat dissipation of the LED module 20 (LED 22) can be further improved.

Further, in the present embodiment, it is preferable that the cross-sectional area of the support column 30 is constant. When the cross-sectional area of the support column 30 changes midway and becomes smaller, it becomes a thermal resistance. For this reason, it is preferable to make the cross-sectional area of the support column 30 constant without changing it. By doing in this way, the thermal resistance in the thermal radiation path | route in the support | pillar 30 can be suppressed to the minimum. Therefore, the heat dissipation of the LED module 20 (LED 22) can be further improved.

Moreover, in this Embodiment, when the input electric power to the LED module 20 is 8.5 W or more, as the support | pillar 30, the cross-sectional area of the support | pillar 30, the area (area A) of the 1st fixed surface 30a, and 2nd The area (area B) of the fixed surface 30b is preferably 175 mm ² or more. Thereby, even if the high output type LED module 20 is used, a desired heat conduction path can be secured in the support column 30.

The volume of the column 30 is preferably 3800 mm ³ or more. In order to accept the heat generated in the LED module 20, it is preferable that the volume (capacity) of the support column 30 be a certain level or more. Therefore, by setting the volume of the column 30 to 3800 mm ³ or more, a desired envelope volume can be secured even in a structure in which the cross-sectional area is reduced in the middle of the column 30 and the thermal resistance is partially increased. it can. As a result, the heat generated in the LED module 20 can be drawn as desired by the support columns 30, so that the heat of the LED module 20 can be efficiently conducted to the heat sink 70.

Further, in the present embodiment, as described above, it is preferable that more than half of the LEDs 22 mounted on the substrate 21 are located immediately above the support column 30. For example, the LEDs 22 can be arranged as shown in FIG. With such an arrangement, the heat dissipation of the LED module 20 as a whole can be improved. Further, the heat of the LED module 20 tends to remain in the central portion of the substrate 21. Therefore, by disposing the LED 22 immediately above the support column 30 connected to the central portion of the substrate 21, the heat generated by the LED 22 can be efficiently conducted to the support column 30.

(Lighting device)
Further, the present invention can be realized not only as such a light bulb shaped lamp but also as an illumination device including a light bulb shaped lamp. Hereinafter, a lighting device according to an embodiment of the present invention will be described with reference to FIG. FIG. 10 is a schematic cross-sectional view of the illumination device according to the embodiment of the present invention.

As shown in FIG. 10, the lighting device 2 according to the embodiment of the present invention is used by being mounted on, for example, an indoor ceiling, and includes the light bulb shaped lamp 1 according to the above embodiment and the lighting fixture 3. Prepare.

The lighting fixture 3 turns off and turns on the light bulb shaped lamp 1 and includes a fixture main body 4 attached to the ceiling and a translucent lamp cover 5 covering the light bulb shaped lamp 1.

The appliance body 4 has a socket 4a. A base 90 of the light bulb shaped lamp 1 is screwed into the socket 4a. Electric power is supplied to the light bulb shaped lamp 1 through the socket 4a.

(Modifications, etc.)
As described above, the light bulb shaped lamp and the lighting device according to the present invention have been described based on the embodiments. However, the present invention is not limited to these embodiments.

For example, in the above-described embodiment, the connection portion between the support column 30 and the substrate 21 or the connection portion between the support column 30 and the support member 40 is configured by one plane, but is not limited thereto. For example, in the case where the contact portion between the support column 30 and the substrate 21 is not configured by a single plane because the support column 30 and the substrate 21 are fitted by a concavo-convex structure or the like, in the base portion on the substrate 21 side A virtual plane (a plane having the normal direction of the extending direction of the support column 30) cut along the outline of the support column 30 may be used as a connection portion between the support column 30 and the substrate 21. Similarly, when the contact portion between the support column 30 and the support member 40 is not configured by a single plane, the connecting portion between the support column 30 and the support member 40 is the outline of the support column 30 at the base portion on the support member 40 side. What is necessary is just to make it the plane (plane which makes the extending | stretching direction of the support | pillar 30 the normal line) cut | disconnected along the line. Further, the case where the support column 30 and the support member 40 are integrally formed of the same material and the support column 30 and the support member 40 are physically configured without breaks can be considered in the same manner.

In the above embodiment, the area (A) of the first fixed surface 30a and the area (B) of the second fixed surface 30b of the support column 30 are configured to be the same, but the present invention is not limited to this. Further, although the column 30 has a constant cross-sectional area, a column having a non-constant cross-sectional area may be used. For example, as shown in FIG. 11, a truncated cone shape may be used as the support column 30 </ b> A. 11 is configured such that the area (B) of the second fixed surface 30b is larger than the area (A) of the first fixed surface 30a, and the second fixed surface 30a is second fixed. The cross-sectional area gradually changes toward the surface 30b. By setting it as such a structure, the heat input into the support | pillar 30A can be efficiently exhausted to the support member 40. FIG. In addition, a pillar or a truncated pyramid shape may be used as the support.

In the above embodiment, a column is used as the support column 30 having a constant cross-sectional area, but this is not restrictive. For example, the column 30 may be a polygonal column such as a quadrangular column or a triangular column.

In the above embodiment, the LED module 20 has a COB type structure in which an LED chip is directly mounted on the substrate 21 as a light emitting element. However, the present invention is not limited to this. For example, as a light emitting element, a package type comprising a resin container having a recess (cavity), an LED chip mounted in the recess, and a sealing member (phosphor-containing resin) enclosed in the recess. You may use the SMD type LED module comprised by mounting several LED elements on the board | substrate 21 in which the metal wiring was formed using the LED element (SMD type LED element).

Moreover, in said embodiment, although the white board | substrate was used as the board | substrate 21 of the LED module 20, the surface of the back side of the two white board | substrates which formed LED22 and the sealing member 23 on the surface were mutually. One LED module 20 may be configured by bonding.

In the above embodiment, the LED module 20 is configured to emit white light by the blue LED chip and the yellow phosphor, but is not limited thereto. For example, in order to improve color rendering properties, a red phosphor or a green phosphor may be further mixed in addition to the yellow phosphor. Moreover, it is also possible to use a phosphor-containing resin containing a red phosphor and a green phosphor without using a yellow phosphor, and to emit white light by combining this with a blue LED chip. it can.

In the above embodiment, the LED chip may emit an LED chip that emits a color other than blue. For example, when an ultraviolet light emitting LED chip is used, a combination of phosphor particles that emit light in three primary colors (red, green, and blue) can be used as the phosphor particles. Furthermore, a wavelength conversion material other than the phosphor particles may be used. For example, the wavelength conversion material absorbs light of a certain wavelength such as a semiconductor, a metal complex, an organic dye, or a pigment, and has a wavelength different from the absorbed light. A material containing a substance that emits light may be used.

In the above embodiment, the LED is exemplified as the light emitting element, but other solid light emitting elements such as a semiconductor light emitting element such as a semiconductor laser, an organic EL (Electro Luminescence), or an inorganic EL may be used.

In addition, the embodiment can be realized by variously conceiving various modifications that those skilled in the art can conceive of each embodiment, or by arbitrarily combining the components and functions in each embodiment without departing from the spirit of the present invention. This form is also included in the present invention.

The present invention is useful as a light bulb shaped lamp that can be substituted for a conventional incandescent light bulb and the like, and can be widely used in lighting devices and the like.

DESCRIPTION OF SYMBOLS 1 Light bulb shaped lamp 2 Illuminating device 3 Lighting fixture 4 Appliance main body 4a Socket 5 Lamp cover 10 Globe 11, 70a, 70b Opening 20 LED module 21 Substrate 22 LED
22a Sapphire substrate 22b Nitride semiconductor layer 22c Cathode electrode 22d Anode electrode 22e, 22f Wire bonding part 22g Chip bonding material 23 Sealing member 24 Metal wiring 25 Wire 26a, 26b Terminal 27a, 27b Through hole 30, 30A Post 30a First fixed Surface 30b Second fixed surface 40 Support member 41 Small diameter portion 42 Large diameter portion 42a Recess 50 Drive circuit 51 Circuit board 52 Circuit element 53a, 53b, 53c, 53d Lead wire 60 Circuit case 61 Case main body portion 61a First case portion 61b Second case portion 62 Cap portion 70 Heat sink 80 Outer casing 90 Base 91 Shell portion 92 Insulating portion 93 Eyelet portion

Claims (10)

1. With the globe,
   A strut extending inward of the globe;
   A substrate connected to one end of the column;
   A plurality of light emitting elements disposed on the substrate;
   A support member connected to the other end of the support and supporting the support;
   An illumination light source satisfying B ≧ A, where A is an area of a connection portion between the support column and the substrate and B is an area of a connection portion between the support column and the support member.
2. And a heat sink connected to the support member,
   The illumination light source according to claim 1, wherein C ≧ A, where C is an area of a connection portion between the support member and the heat sink.
3. The light source for illumination according to claim 2, wherein C ≧ B.
4. The illumination light source according to any one of claims 1 to 3, wherein a cross-sectional area of the support column is constant.
5. 5. The illumination light source according to claim 4, wherein when the input power to the plurality of light emitting elements is 8.5 W or more, the cross-sectional area of the support column is 175 mm ² or more.
6. The illumination light source according to any one of claims 1 to 5, wherein a volume of the column is 3800 mm ³ or more.
7. The illumination light source according to any one of claims 1 to 6, wherein the support column is made of a metal material.
8. The illumination light source according to any one of claims 1 to 7, wherein a part of the plurality of light emitting elements is located immediately above the support column.
9. The heat sink is cylindrical with an opening,
   The support member is fitted into the opening so that the outer periphery of the support member is in contact with the inner surface of the heat sink.
   The illumination light source according to any one of claims 1 to 8, further comprising an insulating housing configured to surround an outer peripheral surface of the heat sink.
10. An illumination device comprising the illumination light source according to any one of claims 1 to 9.

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