JP2007305455A - Led lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an LED lighting device in which its size can be reduced and heat dissipation of its circuit board can be properly carried out. <P>SOLUTION: The LED lighting device has a light source unit 12 and a light guide tube 14 which are contained in a light body 11. The light source unit 12 has a simulated light source formed by arranging a plurality of LEDs 15 in such a way that a light beam of each of the plurality of LEDs 15 turns to an aperture 17. The light guide tube 14 condenses the light beams from the plurality of LEDs 15 of the light source unit 12 to the aperture 17. The circuit board 18 is arranged in a position of a space Sp formed by an inner surface of the light body 11 and an outer surface of the light guide tube 14 distant from the light source unit 12. Heights of components which are mounted on the circuit board 18 become taller as their mounting positions approach the aperture 17. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an LED illumination device using a plurality of LEDs as a light source.

  For example, an LED lighting device using a plurality of LEDs has been developed as a light source of a spotlight used for lighting in a theater or a television studio (see, for example, Patent Document 1). That is, in order to approximate a plurality of LEDs to a point light source, a plurality of LEDs are attached to the LED array portion so that the light beams are directed to the apertures, and the light beams of the plurality of LEDs are condensed on the apertures. Light is emitted to the outside as a pseudo light source. In addition, the light beam of a plurality of LEDs is guided to the exit opening of the light guide tube using a light guide tube, and the exit opening of the light guide tube is used as a pseudo light source to efficiently emit the light beam of the plurality of LEDs. I can do it.

In such an LED lighting device, a circuit board that forms a drive circuit for turning on and off an LED as a light source, an operation circuit for inputting an operation command from the outside, and the like are mounted on the lower portion of the apparatus main body.
JP 2005-158699 A

  However, when the circuit board of the LED lighting device is mounted on the lower part of the device main body, the LED lighting device itself has a size that protrudes downward from the device main body, which increases the size of the LED lighting device itself. On the other hand, since the circuit board itself generates heat, the heat from the circuit board disposed below the LED light source unit may affect the LED light source unit, and the optical characteristics may be deteriorated.

  An object of the present invention is to provide an LED lighting device that can be miniaturized and can also appropriately dissipate heat from a circuit board.

  An LED illumination device according to a first aspect of the present invention is a light source unit that arranges a plurality of LEDs so that each light beam of the plurality of LEDs faces the aperture; and a guide that condenses the light beam from the light source unit on the aperture. A light tube that houses the light source unit and the light guide tube; a space formed by an inner surface of the lamp body and an outer surface of the light guide tube, the light tube being disposed at a position far from the light source unit; And a circuit board on which a component having a larger height dimension is mounted.

  In the present invention and the following inventions, definitions and technical meanings of terms are as follows unless otherwise specified.

  An aperture is an opening through which a light beam passes. The aperture defines a range in which an incident light beam can pass, and determines or restricts the cross-sectional shape of the light beam that passes through the aperture. As the aperture shape, a circle, a rectangle, an ellipse, a polygon, or the like can be used depending on the purpose of use. As a result, the size and shape of the light source are determined.

  The light guide tube is a light beam that enters from the entrance opening and exits from the exit opening. The light guide tube guides the light beams from the plurality of LEDs of the light source unit to the aperture of the exit opening and condenses them. is there. Therefore, the light guide tube has a shape in which the diameter decreases as it approaches the aperture from the plurality of LEDs.

  The lamp means a housing that houses the light source unit and the light guide tube. The circuit board is a circuit having a drive circuit for performing lighting control or dimming control of a plurality of LEDs of the light source unit, an input unit for inputting an operation command from the outside, a control circuit for the plurality of LEDs, and the like. It is a board | substrate, Comprising: It forms by 1 sheet or several sheets.

  The position far from the light source unit in the space formed by the inner surface of the lamp body and the outer surface of the light guide tube is a position from the aperture inside the lamp body. The shape of the light guide tube is such that the diameter becomes smaller as it approaches the aperture from the plurality of LEDs of the light source unit. Therefore, the space formed by the inner surface of the lamp body and the outer surface of the light guide tube is the aperture. Therefore, a component with a larger height dimension is mounted on the circuit board closer to the aperture. In this case, the parts need not necessarily be arranged in the descending order of the dimensions, and parts having different height dimensions may be arranged in a random order. In short, it suffices if parts having a relatively large height are arranged closer to the aperture.

  According to a second aspect of the present invention, the LED lighting device according to the first aspect of the present invention includes the drive circuit board that drives the light source unit and the operation circuit board that inputs an operation command from the outside of the circuit board. It is arranged on another side of the lamp body.

  The drive circuit board for driving the light source unit is a circuit board having semiconductor elements, for example, FETs (field effect transistors), transistors, etc., for performing lighting control or dimming control of a plurality of LEDs of the light source unit. On the other hand, an operation circuit board for inputting an operation command from the outside is a circuit board for inputting an operation command from the outside. The drive circuit board and the operation circuit board are arranged on different side surfaces of the lamp body. In consideration of operability, the operation circuit board is preferably disposed so that the operation unit and the input unit are located outside the lamp body.

  According to a third aspect of the present invention, in the LED lighting device according to the second aspect of the present invention, the drive circuit board is divided and arranged on another side surface of the lamp body.

  Since the drive circuit board controls power supplied to the plurality of LEDs, it generates heat. In addition, the circuit board may be enlarged. In that case, the drive circuit board is divided and distributed on a plurality of side surfaces of the lamp body. It is desirable to arrange the lamps on both side surfaces of the lamp body, which is a part that easily radiates heat.

  According to a fourth aspect of the present invention, there is provided the LED lighting device according to the first or second aspect of the present invention, wherein the LED illumination device is formed in a peripheral portion of the aperture where the light beam is collected by the light guide tube, and diffuses the light condensed on the aperture. And a flange for radiating the heat in the vicinity of the aperture.

  The flange is a bowl-shaped edge formed at the periphery of the aperture at the outlet opening of the light guide tube. The diffusion filter diffuses light from a plurality of LEDs or mixes colors. The flange holds the diffusion filter and also serves to promote heat dissipation by transferring heat near the aperture to the light guide tube.

  According to the first aspect of the present invention, since the circuit board is disposed in the space formed by the inner surface of the lamp body and the outer surface of the light guide tube, the LED lighting device can be reduced in size. In addition, since a component that is taller toward the aperture is mounted on the circuit board, it can be easily arranged in a space formed by the inner surface of the lamp body and the outer surface of the light guide tube. Furthermore, since the circuit board is disposed at a position far from the light source unit in the space formed by the inner surface of the lamp body and the outer surface of the light guide tube, it is less likely to be affected by heat generated from the plurality of LEDs of the light source unit.

  According to the invention of claim 2, since the drive circuit board and the operation circuit board are arranged in different regions of the lamp body, the lamp body can be miniaturized. Further, since the heat radiating member can be arranged opposite to the side surface on the back side of the drive circuit board, the heat radiating action can be promoted. On the other hand, since the operation circuit board can be disposed so that the operation unit and the input unit are located outside the lamp body, operability can be ensured.

  According to the invention of claim 3, since the drive circuit board is divided and arranged on the other side surface of the lamp body, the lamp body can be downsized even when the drive circuit board is enlarged. In addition, when the lamps are arranged on both side surfaces of the lamp body, the heat dissipating action can be made uniform, so that the heat dissipating action is not biased and heat can be radiated efficiently.

  According to the fourth aspect of the present invention, the heat of the diffusion filter is absorbed from the flange and transmitted to the light guide tube and radiated by the entire light guide tube, so that the heat in the vicinity of the aperture can be efficiently radiated. Accordingly, it is possible to prevent deterioration of the diffusion filter installed in the vicinity of the aperture due to heat.

(First embodiment)
FIG. 1 is an external view of an LED lighting device according to a first embodiment of the present invention, FIG. 2 is a top view of the cross section along line AA in FIG. 1, and FIG. 3 is a cross section along line BB in FIG. FIG. 4 is a front view taken along the line CC of FIG. As shown in FIG. 1, a light source unit 12 is housed and arranged on the back surface of the lamp body 11, and a lens unit 13 is provided on the front surface of the lamp body 11. Then, illumination light is emitted from the lens unit 13 to the outside.

  As shown in FIG. 2, the light guide tube 14 is accommodated in the lamp body 11, and the light source unit 12 is accommodated in the back surface portion. The light source unit 12 has a plurality of LEDs 15, and heat radiation fins 16 are provided on the back surface. The heat generated by the plurality of LEDs 15 is radiated to the outside of the lamp body 11 by the radiation fins 16.

  The plurality of LEDs 15 of the light source unit 12 are arranged so that each light beam faces the aperture 17, and the light guide tube 14 enters the light beam of the plurality of LEDs 15 from the entrance opening, and the incident light beam Is condensed toward the aperture 17 at the exit opening, and the aperture 17 forms a pseudo light source. The light guide tube 14 is an optical path through which the light beam passes. The light guide tube 14 has a function of condensing the light beam toward the aperture 17 as well as preventing the light beam from leaking to the outside. It also has a role to prevent from entering the optical path.

  The pseudo light source is a light source when a light beam passing through the aperture is regarded as a light source, and the actual light source is a plurality of LEDs arranged in the light source unit, but each light beam of the plurality of LEDs is apertured. A pseudo light source is made by arranging the light beams toward the center and condensing them with an aperture. The light from the pseudo light source is emitted to the outside through the projection lenses 24 a and 24 b of the lens unit 13.

  Thus, since the light guide tube 14 condenses the light beam toward the aperture 17, the light guide tube 14 has a shape in which the diameter decreases as it approaches the aperture 17 from the direction of the light source unit 12. Accordingly, the space Sp formed by the inner surface of the lamp body 11 and the outer surface of the light guide tube 14 is conversely larger as it approaches the aperture 17 from the direction of the light source unit 12. The circuit board 18 is accommodated in the space Sp.

  FIG. 5 is a side view of the circuit board 18 according to the first embodiment of the present invention. A component 19a having a large height, a component 19b having a small height, and a component 19c having an intermediate height are mounted on the circuit board 18. The space Sp that accommodates the circuit board 18 is provided in the light source unit 12. Since the space is larger as it approaches the aperture 17 from the direction, a component 19a having a larger height is mounted closer to the aperture 17. Further, since the plurality of LEDs 15 of the light source unit 12 generate heat, the circuit board 18 is disposed in a position far from the light source unit 12 in the space Sp so as not to be affected by the heat.

  As shown in FIGS. 2 and 3, drive circuit boards 18a1 and 18a2 are formed on the circuit board 18 of the LED lighting device. The drive circuit boards 18a1 and 18a2 are formed with drive circuits for turning on / off or dimming the LEDs 15 of the light source unit 12. There are an operation circuit board 18b in which an operation circuit for inputting an operation command from the outside is formed, and a control circuit board 18c in which a control circuit for a plurality of LEDs 15 and the like are formed.

  The drive circuit board 18a that drives the light source unit 12 controls the power supplied to the plurality of LEDs 15, so that it becomes a relatively large circuit board and generates heat. When formed with one circuit board, it becomes a large circuit board and does not enter the space Sp, so it is divided into two parts, and the drive circuit boards 18a1 and 18a2 divided into two parts are formed on both side surfaces of the lamp body 11 as shown in FIG. To place.

  Here, it is also possible to store one of the drive circuit boards 18 a divided into two on one of the side surfaces of the lamp body 11 and arrange the other one of the drive circuit boards 18 a divided into two on the upper surface of the lamp body 11. However, it is arranged on both side surfaces of the lamp body 11 in consideration of balance and heat dissipation. That is, when the drive circuit boards 18 a 1 and 18 a 2 divided into two are arranged on both side surfaces of the lamp body 11, the radiation fins 20 can be provided on both side surfaces of the lamp body 11 as shown in FIG. 4.

  The operation circuit board 18b on which an operation circuit for inputting an operation command from the outside is formed is disposed on the upper surface of the lamp body 11 as shown in FIG. This is because the operation circuit board 18b gives an operation command to each part of the LED lighting device and is a relatively small circuit board. This is also because the operability from the outside is taken into consideration. By disposing the operation circuit board 18b on the upper surface of the lamp body 11, operability from the outside is improved.

  Further, the control circuit board 18c on which the control circuits and the like of the plurality of LEDs 15 are formed is disposed on the lower surface portion of the lamp body 11 as shown in FIG. This is because no external interface is required, there are few heat-generating components, and components with high temperature characteristics are mounted, so there is no need to dissipate heat. A lighting power source 21 is disposed on the lower surface of the lamp body 11.

  In the above description, the operation circuit board 18b is provided on the upper surface portion of the lamp body 11 and the drive circuit board 18a is provided on both side faces of the lamp body 11. However, as shown in FIG. May be provided on the upper surface of the lamp body 11, and the operation circuit board 18b may be provided on the side surface. And you may make it provide the thermal radiation fin 20 in the back surface side of the drive circuit board | substrate 18a provided in the upper surface part.

  According to the first embodiment, the light beam from the plurality of LEDs 15 of the light source unit 12 is guided and condensed to the aperture 17 by the light guide tube 14, and the lamp body 11 that houses the light source unit 12 and the light guide tube 14 is collected. Since the circuit board 18 is disposed in the space Sp formed by the inner surface and the outer surface of the light guide tube 14, the LED illumination device can be reduced in size. In addition, since the component 19a that is taller toward the aperture 17 is mounted on the circuit board, it can be easily arranged in the space Sp formed by the inner surface of the lamp body 11 and the outer surface of the light guide tube. Furthermore, since the circuit board 18 is disposed at a position far from the light source unit 12 in the space Sp formed by the inner surface of the lamp body 11 and the outer surface of the light guide tube 14, the influence of heat generated from the plurality of LEDs 15 of the light source unit 12 is affected. The circuit board 18 can be appropriately radiated with heat.

  Further, since the drive circuit board 18a for driving the light source unit 12 is disposed on both side surfaces of the lamp body 11, the heat radiation fin 20 is provided on the side surface portion of the lamp body 11 so that the drive circuit board 18a can be radiated easily. . Further, since the drive circuit board 18a for driving the light source unit 12 is divided and arranged on both side surfaces of the lamp body 11, the lamp body 11 can be downsized even when the drive circuit board 18a is enlarged. Can do. In addition, since the heat dissipating action can be made uniform, the heat dissipating action is not biased and heat can be efficiently dissipated.

  On the other hand, since the operation circuit board 18b for inputting an operation command from the outside is disposed on the upper surface portion of the lamp body 11, the operation from the outside can be easily performed. Further, the control circuit board 18c on which the control circuits and the like of the plurality of LEDs 15 are formed is disposed on the lower surface portion of the lamp body 11 in the vicinity of the lighting power source 21 provided at the lower part of the lamp body 11, so And the space Sp formed by the outer surface of the light guide tube 14 can be used effectively.

(Second Embodiment)
FIG. 7: is a side view in the longitudinal cross-section part of the LED lighting apparatus concerning the 2nd Embodiment of this invention. In contrast to the first embodiment shown in FIG. 3, a flange 22 is additionally provided at the outlet opening of the light guide tube 14. The same elements as those in FIG.

  The flange 22 is formed as a bowl-shaped edge around the aperture 17 at the outlet opening of the light guide tube 14, and the flange 22 holds the diffusion filter 23. The diffusion filter 23 diffuses the light from the plurality of LEDs 15 and emits the light to the lens unit 13. Projection lenses 24a and 24b are built in the lens unit 13, and the light obtained by the aperture 17 is used as a pseudo light source and emitted to the outside as illumination light.

  Further, since the diffusion filter 23 has heat due to the irradiation light from the plurality of LEDs 15, the heat is transmitted to the light guide tube 14 through the flange 22 and is radiated by the light guide tube 14.

  According to the second embodiment, the heat accumulated in the diffusion filter 23 by the irradiation light condensed on the aperture 17 by the irradiation light from the plurality of LEDs 15 is absorbed by the flange 22 and transmitted to the light guide tube 14. Since heat is radiated by the entire light guide tube 14, the heat in the vicinity of the aperture 17 can be radiated efficiently. Therefore, deterioration of the diffusion filter 23 installed in the vicinity of the aperture 17 due to heat can be prevented.

1 is an external view of an LED lighting device according to a first embodiment of the present invention. The top view in the AA line cross-section part of FIG. The side view in the BB line cross-section part of FIG. The front view in the CC sectional view taken on the line of FIG. The side view of the circuit board in the 1st Embodiment of this invention. The front view in the CC sectional view section of Drawing 1 showing other examples of arrangement of a circuit board in a 1st embodiment of the present invention. The side view in the longitudinal cross-section part of the LED lighting apparatus concerning the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Lamp body, 12 ... Light source unit, 13 ... Lens unit, 14 ... Light guide tube, 15 ... LED, 16 ... Radiation fin, 17 ... Aperture, 18 ... Circuit board, 19 ... Components, 20 ... Radiation fin, 21 ... Power source for lighting, 22 ... flange, 23 ... diffusion filter, 24 ... projection lens

Claims (4)

A light source unit that arranges the plurality of LEDs so that each light beam of the plurality of LEDs faces the aperture;
A light guide tube for condensing the light beam from the light source unit on the aperture;
A lamp housing the light source unit and the light guide tube;
A circuit board that is disposed at a position far from the light source unit in a space formed by the inner surface of the lamp body and the outer surface of the light guide tube, and on which a component having a larger height is mounted closer to the aperture;
An LED lighting device comprising:   The drive circuit board which drives the said light source unit among the said circuit boards, and the operation circuit board which inputs the operation command from the outside have been arrange | positioned on the other side surface of the said lamp body. LED lighting device.   3. The LED lighting device according to claim 2, wherein the drive circuit board is divided and arranged on another side surface of the lamp body. The light guide tube includes a flange that is formed in a peripheral portion of the aperture that collects the light beam, holds a diffusion filter that diffuses the light collected by the aperture, and dissipates heat in the vicinity of the aperture. The LED lighting device according to claim 1 or 2, wherein

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