WO2013171945A1 - Light source apparatus and lighting apparatus using same - Google Patents

Abstract

This light source apparatus is integrally provided with: a heat sink having a base end portion; a single base that directly holds the base end portion of the heat sink; and a light emitting diode, which is mounted on the outer surface of the heat sink, and which is thermally coupled to the heat sink. The base is provided with a screw inserting hole for fixing the base to an area where the base is to be disposed.

Description

Light source device and lighting apparatus using the same

The present invention relates to a light source device and a lighting fixture using the same.

Japanese Patent Publication No. 2008-103112 discloses an LED bulb. In this LED bulb, as shown in FIG. 8, a base body 12 to which a plurality of light emitting diodes 11 are fixed is covered with a light-transmitting globe 21 to form a bulb-shaped outer shape.

The LED bulb includes a base 9 having a structure conforming to the standard of a general incandescent lamp base, and a lighting device 3 for lighting each light-emitting diode 11 by power supplied through the base 9. ing. In this LED bulb, the base 12 is formed integrally with the base 10. The base part 10, the globe 21 and the base 9 are fixed to the cover 20, respectively, and the heat generated by the light emitting diode 11 is released to the outside through the base body 12, the base part 10, the cover 20 and the base 9. . The LED bulb can be connected to a socket of an existing incandescent bulb lighting fixture instead of the incandescent bulb.

In the light source device (LED light bulb) as described above, in order to increase the luminous flux, not only the light emitting diode 11 having a higher luminous flux is used or the number of the light emitting diodes 11 is increased, but also the heat generation amount is increased. Therefore, it is necessary to increase the size of the base 12 that functions as a heat sink. Therefore, increasing the luminous flux as described above is accompanied by an increase in weight.

However, when the existing base 9 is used for the connection of the light source device as described above, there is a limit to the weight that can be safely held, and thus there is a limit to increasing the luminous flux as described above. Further, in the above light source device, the heat generated in the light emitting diode 11 is released to the outside through the heat sink 12, the base 10, the cover 20, and the base 9. It may not be done enough.

The present invention has been made in view of the above reasons, and an object thereof is to provide a light source device capable of increasing the luminous flux.

The light source device of the present invention includes a heat sink (12) having a base end (12b), a single base (15) that directly holds the base end (12b) of the heat sink (12), and the heat sink (12 And a light emitting diode (11) that is attached to the outer surface of the heat sink (12) and is thermally coupled to the heat sink (12). The pedestal (15) is fixed to the installation location. A screw insertion hole (150) is provided.

The light source device includes an apparatus main body (1) having the heat sink (12), the pedestal (15), and the light emitting diode (11), and a window (210) through which light from the light emitting diode (11) passes. And a cover (2) detachably coupled to the device body (1) so as to cover the light emitting diode (11).

In the above light source device, at least a part of the window (210) may diffuse light of the light emitting diode (11).

In the light source device described above, the cover (2) may include a reflecting portion (211) that reflects light from the light emitting diode (11).

The light source device further includes a lighting circuit (3) that is electrically connected to the light emitting diode (11) and lights the light emitting diode (11), and the lighting circuit (3) is integrated with the base (15). May be held.

The light source device further includes a lighting circuit (3) that is electrically connected to the light emitting diode (11) through an electric wire and a connector (51, 52) and lights the light emitting diode (11). The circuit (3) may be housed in a case (30) that can be displaced relative to the pedestal (15).

The lighting fixture of the present invention includes any one of the light source devices described above and a fixture body (6) to which the pedestal (15) is fixed with screws.

According to the present invention, the fixing of the apparatus body of the light source device is achieved by screwing, so that the restriction on the weight of the apparatus body is relaxed compared to the case where the fixing of the apparatus body is achieved by a base similar to an incandescent lamp. Therefore, high luminous flux can be achieved. Further, since the light emitting diode is directly coupled to the pedestal (via the heat sink) and the pedestal is fixed to the installation location, the heat generated in the light emitting diode can be effectively released to the outside. Further, the light color or the like can be easily changed by replacing the cover.

It is sectional drawing which shows embodiment of this invention. It is a perspective view which shows the apparatus main body of embodiment of this invention. It is a front view which shows the cover of embodiment of this invention. It is a perspective view which shows the principal part of the cover of embodiment of this invention. It is a perspective view which shows the example of a change of embodiment of this invention. FIG. 6A is an explanatory diagram illustrating an example of a range in which a reflecting portion is provided in the embodiment of the present invention, and FIG. 6B is a perspective view illustrating an example of a lighting fixture using the apparatus of FIG. 6A. FIG. 7A is an explanatory view showing another example of a range in which the reflecting portion is provided in the embodiment of the present invention, and FIG. 7B is a perspective view showing an example of a lighting fixture using the apparatus of FIG. 7A. It is explanatory drawing which shows the structure of a prior art example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 and 2, the light source device of the present embodiment includes a device main body 1 having a plurality of light emitting diodes 11 and heat sinks 12 thermally connected to the light emitting diodes 11, respectively.

The apparatus main body 1 includes a heat sink 12 having a base end portion 12b, a single pedestal 15 that directly holds the base end portion 12b of the heat sink 12, and an outer surface of the heat sink 12 and is thermally coupled to the heat sink 12. The light emitting diode 11 is integrally provided.

The heat sink 12 has a first end (tip portion) 12a and a second end (base end portion) 12b, and is formed in a cylindrical shape extending in one direction. The heat sink 12 is fixed to the pedestal 15 so as to be perpendicular to the bottom surface 15 a of the pedestal 15.

Further, as shown in FIGS. 1, 3, and 4, the light source device of the present embodiment has a globe 21 (window portion 210) that allows light from the light emitting diode 11 to pass therethrough and covers the light emitting diode 11. 1 is provided with a cover 2 that is detachably coupled to 1.

The globe 21 is formed in a substantially hollow sphere shape (substantially bulb shape) having an opening 21b, and has a top portion 21a on the opposite side of the opening 21b. The heat sink 12 is inserted into the globe 21 through the opening 21b. The cover 2 is attached to the apparatus main body 1 with the light emitting diode 11 positioned in the globe 21.

The bottom surface 15a of the base 15 defines the bottom of the light source device.

Each light emitting diode 11 is, for example, a so-called white light emitting diode that includes at least one light emitting diode chip that generates blue light and an optical filter that covers each light emitting diode chip and converts the blue light into white light. . The heat sink 12 is a cylindrical part made of copper, for example, and is fixed to the pedestal 15 so that the length direction (axial direction) is perpendicular to the bottom surface 15 a of the pedestal 15. Further, as shown in FIG. 1, one light emitting diode 11 is surface-mounted on one substrate 13.

The substrate 13 includes a plurality of rectangular first substrates 131 that form a polygonal cylindrical shape covering an outer peripheral surface other than the base end portion 12b of the heat sink 12, and a top surface (base end portion 12b And a second substrate 132 having a polygonal shape covering the opposite surface.

That is, the substrate 13 includes a plurality of first substrates 131 having a rectangular shape and a second substrate 132 having a polygonal shape. The plurality of first substrates 131 are arranged so as to cover the outer peripheral surface (side surface) of the heat sink 12. The second substrate 132 is disposed on the top surface of the heat sink 12.

As the light emitting diode 11 mounted on the first substrate 131 having a rectangular shape, an elongated one having a plurality of light emitting diode chips arranged in a straight line is used. Each substrate 13 is bonded to the heat sink 12 by an adhesive 14. That is, each light emitting diode 11 is thermally connected (thermally coupled) to the heat sink 12 via the substrate 13 and the adhesive 14. As said board | substrate 13 and the adhesive agent 14, it is desirable to use what has respectively high thermal conductivity. For example, a ceramic substrate is used as the substrate 13, and a silicone adhesive is used as the adhesive 14. In addition, instead of mounting one light emitting diode 11 on each substrate 13 as shown in FIG. 2, a plurality of light emitting diodes 11 may be mounted on one substrate 13.

The apparatus body 1 includes a pedestal 15. The pedestal 15 protrudes radially outward from a cylindrical portion 151 coupled to the heat sink 12 so as to surround the base end portion 12b of the heat sink 12 and one end (lower end in FIG. 1) on the bottom side of the cylindrical portion 151. Part 152. Since the heat dissipation of the heat sink 12 is mainly performed via the pedestal 15, it is desirable to use a material (for example, aluminum) having as high a thermal conductivity as possible. The pedestal 15 as described above can be manufactured, for example, by die casting.

Further, a lighting circuit 3 that is electrically connected to each light emitting diode 11 and lights each light emitting diode 11 is disposed on the collar portion 152 of the base 15. The lighting circuit 3 is, for example, a well-known DC power supply circuit that converts electric power input from an external power supply into appropriate DC power and supplies it to each light emitting diode 11. The lighting circuit 3 is electrically connected to the light emitting diode 11 via a wiring (not shown), and is connected to an external power source via an electric wire (not shown).

Between the base 15 and the lighting circuit 3, an insulating plate 19 that electrically insulates the lighting circuit 3 from the base 15 is provided. The insulating plate 19 is made of, for example, a synthetic resin.

The apparatus main body 1 further includes a base cover 16 that has a cylindrical shape surrounding the cylindrical portion 151 of the pedestal 15 and that covers the lighting circuit 3 together with the pedestal 15. The base cover 16 is made of, for example, a synthetic resin. A cylindrical spacer 18 that covers the outer peripheral surface of the heat sink 12 is disposed on the side surface of the heat sink 12 between the cylindrical portion 151 and the substrate 13.

As shown in FIGS. 1, 3, and 4, the cover 2 of the present embodiment includes a globe 21 as a window portion that is made of a light-transmitting material and allows light from each light-emitting diode 11 to pass through. It is configured to be detachably coupled to the apparatus main body 1 so as to cover each light emitting diode 11. The cover 2 includes a globe 21 and a cover base 22.

The globe 21 is made of glass, for example, and is formed in a substantially spherical shape having an opening 21b. Specifically, the globe 21 has a hemispherical shape that opens to the bottom side (downward in FIG. 1), and a funnel in which the inner diameter and the outer diameter are gradually reduced toward the bottom side, continuing to the opening end of the hemispherical shape. It is a light bulb shape combined with the shape.

The cover base 22 is formed in a hollow cylindrical shape that surrounds the bottom end of the globe 21. The cover base 22 is made of, for example, a synthetic resin. The cover base 22 is integrally coupled to the globe 21. The cover base 22 is coupled to the globe 21 so as to cover the opening 21 b of the globe 21. The cover 2 is coupled to the apparatus main body 1 at the cover base 22.

As shown in FIG. 2, a plurality of locking projections (first locking portions) 161 projecting outward in the radial direction are provided on the outer peripheral surface of the base cover 16 in the apparatus main body 1 (in the present embodiment, 3). Are provided at substantially equal intervals in the circumferential direction. Further, as shown in FIG. 4, at the end of the inner peripheral surface of the cover base 22 on the bottom side (lower side in FIG. 4), a locked convex portion (second locking portion) 221 is provided in the radial direction. It protrudes inward. Each locked protrusion 221 is formed in a substantially L shape, and protrudes inward in the radial direction from the inner peripheral surface of the cover base 22. A locking recess 223 is formed so as to be surrounded by the inner peripheral surface of the cover base 22 and the locked protrusion 221.

When attaching the cover 2 to the apparatus main body 1, the cover 2 is put on the apparatus main body 1 in a state where the position of the locked convex portion 221 is shifted from the position of the locking convex portion 161. After that, when the cover 2 is rotated clockwise with respect to the apparatus main body 1 when viewed from the top 21a side of the globe 21 (viewed from above in FIG. 2), each of the locking projections 161 has a corresponding locking. Engage in the recess 223 (the space above the corresponding locked projection 221). Here, the cover 2 is prevented from falling off from the apparatus main body 1 (pedestal 15), and the attachment of the cover 2 to the apparatus main body 1 is completed. That is, the cover 2 is detachably coupled to the apparatus main body 1 by so-called bayonet fastening.

Further, as shown in FIG. 2, a click spring 17 made of a leaf spring is attached to each locking projection 161. Each click spring 17 has one end coupled to the upper surface of the locking projection 161 and extending while curving from the upper surface side to the lower surface side of the locking projection 161, and the base cover 16 from the tip of the coupling portion 171. And a spring portion 172 that extends clockwise when viewed from the front end portion 12a side of the heat sink 12 (as viewed from above in FIG. 2). The spring portion 172 can be elastically deformed to displace the tip portion in the axial direction of the pedestal 15 (up and down with respect to the coupling portion 171). The tip portion of the spring portion 172 has a direction away from the base cover 16 ( A click portion 173 protrudes radially outward). The surface on the cover 2 side in the click portion 173 (the upper surface in FIG. 2) is formed in a convex curved surface shape. Further, as shown in FIG. 4, on the bottom surface of the cover base 22, in the vicinity of each locked convex portion 221 in the clockwise direction when viewed from the top 21 a side (counterclockwise direction when viewed from the bottom side), Each click recess 222 is provided.

In the process of attaching the cover 2 to the apparatus main body 1, the click portion 173 is pressed toward the bottom side (downward in FIG. 2) by a portion other than the click recess 222 of the cover base 22, whereby the spring portion 172 of the click spring 17 is elastic. Deform. When the locking projection 161 is completely engaged with the locking recess 223 (the space above the locked projection 221) (that is, when the locking projection 161 is completely locked). When the click portion 173 is engaged with the click recess 222, the click spring 17 is elastically restored. In other words, since the above-described elastic recovery gives the operator a click feeling, the operator can easily recognize that the engagement of the locking convex portion 161 has been completed (that is, the attachment has been completed). Further, since the click portion 173 is engaged with the click recess 222, a resistance force is generated in the rotation of the cover 2 with respect to the apparatus main body 1, so that the rotation of the cover 2 unintended by the user is suppressed.

Instead of fixing the lighting circuit 3 to the apparatus main body 1 as described above, as shown in FIG. 5, the lighting circuit 3 is housed in a case 30 separate from the apparatus main body 1 and a flexible cable 41, The lighting circuit 3 may be displaceable with respect to the apparatus main body 1 by being connected to the apparatus main body 1 via 42. The cables 41 and 42 include electric wires that electrically connect the lighting circuit 3 and each light emitting diode 11. A connector 51 is connected to the other end of the cable 41 whose one end is connected to the apparatus main body 1, and a connector 52 is connected to the other end of the cable 42 whose one end is connected to the lighting circuit 3. The cable 41 and the cable 42 are connected to each other via connectors 51 and 52. That is, in the example of FIG. 5, the lighting circuit 3 and each light emitting diode 11 are electrically connected to each other via the cables 41 and 42 and the connectors 51 and 52. The lighting circuit 3 is electrically connected to an external power supply via a cable (not shown).

If a part or all of the lighting circuit 3 is separated from the apparatus main body 1 as described above, design restrictions on the lighting circuit 3 are alleviated. Further, since the lighting circuit 3 is separated from the apparatus main body 1 and the connectors 51 and 52 are interposed between the lighting circuit 3 and the apparatus main body 1, only one of the lighting circuit 3 and the apparatus main body 1 is left and the other. It is relatively easy to replace the battery.

In the case 30, the connection between the lighting circuit 3 and the power source is cut off when a surge voltage is input between the control circuit for controlling the lighting circuit 3 or between the power source and the lighting circuit 3. Other circuits such as a surge protection circuit may be accommodated. The control circuit includes a sensor that controls the lighting circuit 3 according to a signal (wired signal or wireless signal) input from an external remote control device, a sensor such as an optical sensor or a human sensor, What controls the lighting circuit 3 according to an output may be included. The above control may be turning on / off, or may include changing the light output. The light output of the light emitting diode 11 can be changed, for example, by changing the current value output to the light emitting diode 11 or (when causing the light emitting diode 11 to blink at a frequency sufficiently high that it is not recognized as blinking by human eyes). This can be achieved by changing the on-duty. Further, when a plurality of types of light emitting diodes 11 having different light colors are mixed, the control circuit changes the ratio of the light output of the plurality of types of light emitting diodes 11 as a whole color mixture. The light color may be changed.

Here, the globe 21 of the cover 2 may be colorless and transparent, or may be colored. The globe 21 may be partially or wholly subjected to a surface treatment for diffusing light from the light emitting diode 11. When the globe 21 is colored, the light color of the light emitted through the globe 21 changes according to the color of the globe 21, so that the light color can be changed by replacing the cover 2. Moreover, as said surface treatment, roughening may be used, for example. Alternatively, the globe 21 may have light diffusibility by fixing particles of alumina or silica on the globe 21. Alternatively, instead of the above surface treatment, the light of the light emitting diode 11 may be diffused by configuring the globe 21 with, for example, a milky white material.

Furthermore, as shown in FIG. 6A and FIG. 7A, a reflection portion 211 that reflects the light of the light emitting diode 11 may be provided on the cover 2. The reflecting part 211 is made of, for example, a metal film that covers a part of the inner surface or the outer surface of the globe 21. In this case, a portion of the globe 21 where the reflecting portion 211 is not provided is the window portion 210. The metal film can be formed using a known technique such as sputtering. If the reflection part 211 as described above is provided, different light distributions can be obtained depending on the size and shape of the reflection part 211. Further, the globe 21 does not have to have the shape of a light bulb as described above, and the light distribution changes depending on the shape of the globe 21.

In the example of FIG. 6A, the reflecting portion 211 is formed on the opening 21 b side in the globe 21. Accordingly, the window 210 is formed on the top 21a side (the lower end in FIG. 6A) of the globe 21, and the light of the light emitting diode 11 is emitted from the top 21a side (downward in FIG. 6A) of the globe 21.

The light source device provided with such a cover 2 is used in a lighting fixture as shown in FIG. 6B, for example. The lighting fixture includes a fixture body 6 that fixes the light source device with the bottom portion facing upward. The instrument body 6 has an accommodation recess 60 that opens downward in FIG. 6B and accommodates the light source device. The inner surface of the housing recess 60 may be subjected to an appropriate surface treatment such as polishing or painting so as to increase the reflectance of the light emitting diode 11 with respect to the light. In addition, an annular flange 61 projects outwardly around the opening of the storage recess 60 in the instrument body 6. Further, the fixture body 6 is connected to a clamp 7 that sandwiches a ceiling material (not shown) between the upper surface of the flange portion 61.

That is, the above-described lighting fixture is a so-called downlight that is embedded in an embedding hole provided in the ceiling material and illuminates the lower part, and the ceiling material is sandwiched between the flange 61 and the sandwiching metal 7 around the embedding hole. The appliance body 6 is fixed with respect to the ceiling material.

7A, the reflecting portion 211 is formed on one side in the radial direction of the globe 21 (upper side in FIG. 7A). The reflection part 211 is provided in a range that covers the globe 21 when viewed from one side in the radial direction. Accordingly, the window 210 is formed on the other radial side of the globe 21 (lower side in FIG. 7A), and the light from the light emitting diode 11 is on the other radial side (lower side in FIG. 7A). Radiated through 210.

The light source device provided with the cover 2 as described above is used in a lighting fixture as shown in FIG. 7B, for example. The lighting fixture includes a fixture body 6 that fixes the light source device with the window 210 facing downward (with the axial direction of the heat sink 12 oriented horizontally). The instrument body 6 has an accommodation recess 60 that opens downward in FIG. 7B and accommodates the light source device. The instrument body 6 shown in FIG. 7B is fixed to the upper end of a pole 8 whose lower end is fixed to the ground. The lighting fixture which this fixture main body 6 and a light source device comprise is a street lamp, for example.

Here, as shown in FIG. 2, the pedestal 15 in the apparatus main body 1 is provided with a screw insertion hole 150 for fixing the pedestal 15 to an installation location (ceiling, lighting fixture, etc.). Specifically, a plurality of (for example, three) screw insertion holes 150 are provided in the flange portion 152 of the base 15 so as to penetrate in the thickness direction of the flange portion 152 (vertical direction in FIG. 2). Fixing of the pedestal 15 with respect to the fixture body 6 or the like on the ceiling surface or the lighting fixture is achieved by screwing using a screw (not shown) inserted through the screw insertion hole 150 described above.

According to the above configuration, the fixing of the pedestal 15 is achieved by screwing, so that the restriction on the weight of the apparatus main body 1 is relaxed compared to the case where the apparatus main body 1 is fixed by the base 9 similar to the incandescent bulb. Therefore, high luminous flux can be achieved. Further, since the light emitting diode 11 is directly coupled to the pedestal 15 (via the heat sink 12), the heat generated by the light emitting diode 11 can be effectively released to the outside via the pedestal 15.

Moreover, since the cover 2 having the window 210 that allows the light of the light emitting diode 11 to pass through is detachable from the apparatus main body 1 having the light emitting diode 11, the light color, the degree of light diffusion, and the light distribution Such a change can be easily achieved by replacing the cover 2.

Particularly in the light source device of the present embodiment, the light color, the light distribution, etc. can be easily changed by replacing the cover 2 while the device body 1 is securely fixed by screwing.

Claims (7)

A heat sink having a proximal end;
A single pedestal that directly holds the proximal end of the heat sink;
A light emitting diode attached to the outer surface of the heat sink and thermally coupled to the heat sink;
The pedestal is provided with a screw insertion hole for fixing the pedestal to an installation location. An apparatus body having the heat sink, the pedestal, and the light emitting diode;
The light source device according to claim 1, further comprising: a cover having a window portion through which light of the light emitting diode passes and removably coupled to the device main body so as to cover the light emitting diode. 3. The light source device according to claim 2, wherein at least a part of the window part diffuses light of the light emitting diode. 4. The light source device according to claim 2, wherein the cover has a reflecting portion that reflects light of the light emitting diode. A lighting circuit that is electrically connected to the light emitting diode and lights the light emitting diode;
5. The light source device according to claim 1, wherein the lighting circuit is integrally held on the pedestal. A lighting circuit that is electrically connected to the light emitting diode via an electric wire and a connector to light the light emitting diode;
The light source device according to any one of claims 1 to 4, wherein the lighting circuit is housed in a case displaceable with respect to the pedestal. An illumination fixture comprising: the light source device according to any one of claims 1 to 6; and a fixture main body to which the pedestal is fixed with screws.

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