JP2008016314A - Light source using light-emitting diode and lighting system using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source using LEDs which can enhance mounting density, freely adjust the density, attain compactness as a light source, have a high luminance and make a pseudo-white color excellent in a color rendering property and provide a lighting system using the light source. <P>SOLUTION: The light source 1 is provided with a columnar body 2 as a cylindrical part, a light-emitting diode base plate part 3 which has a hexagonal shape and six steps and is provided on the columnar surface 20 of the columnar body 2, a plurality of light-emitting diodes (LEDs) 4 which are arranged on the LED base plate part 3 and of which the light-emitting parts are oriented toward a bottom face 21 of the columnar body 2, a diffusion plate 5 provided on the bottom face 21 to diffuse emitted light from these LEDs 4 and a controlling circuit board 6 arranged on a top face 22 to control the emitted light from the LEDs 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a light source using a light emitting diode (LED) and an illuminating device using the same, and more particularly to a light source capable of mounting LEDs at high density and an illuminating device using the same.

As an illuminating device that attaches LEDs at high density and emits the light from the light emitting surface of the housing, “Light Emitting Diode Assembly Lamp” disclosed in Patent Document 1 and “High” disclosed in Patent Document 2 Density LED light emitting display ".
A configuration common to these illumination devices is that LEDs are mounted on the light emitting surface with high density.

However, the following problems can be pointed out in the illumination devices disclosed in Patent Literature 1 and Patent Literature 2.
That is, since the LEDs are mounted on the light emitting surface with high density in the lighting device, the LED mounting density is limited by the area of the light emitting surface. Theoretically, if the area of the light emitting surface is increased, the mounting density of the LEDs can be increased. However, due to the nature of the lighting device, there is a limit to the expansion of the area of the light emitting surface.

On the other hand, as an illuminating device that obtains reflected light by reflecting light emitted from an LED with a reflecting mirror, there are “LED illuminating device” disclosed in Patent Document 3, “luminaire” disclosed in Patent Document 4, and the like. is there.
However, the following problems can be pointed out for these lighting devices.
In the “LED lighting device” of Patent Document 3, the ultraviolet LED module 20 is arranged at the center of the opening 32 of the reflecting mirror 30 as shown in FIG. 3, and in FIG. The ultraviolet LED module 20 is arranged in a donut shape in the center of the opening 32 of the mirror 30. Therefore, the LED module 20 has a structure in which the LED module 20 is disposed in the opening 32 of the reflecting mirror 30, and it is difficult to make the LED mounting density high, and the LED module 20 obstructs the optical path of the reflected light. It is also.

In the “lighting fixture” of Patent Document 4, a plurality of light emitting diodes 1 that emit red, blue, and green light are arranged on a spherical base 5, and the mounting density of LEDs can be increased. The mounting structure of the base 5 with respect to 2 is not necessarily clear and lacks compactness.
JP2006-80095 JP-A-7-98569 JP 2006-59625 A JP 2005-38605 A

  Therefore, the present invention solves the problems clarified from each of the above patent documents, and under the condition that the size of the light emitting surface is limited, the mounting density of the light emitting diodes can be increased, and the function of the light emitting surface is improved. Providing a light source that can freely adjust the mounting density of light-emitting diodes without harm, providing a light source that can ensure compactness, providing a light source with high luminous intensity of light-emitting diodes, and pseudo-white with excellent color rendering It is an object of the present invention to provide a light source capable of producing a light source and to provide an illumination device using these light sources.

  In order to achieve these objects, a cylindrical portion, a light emitting diode substrate portion provided on a cylindrical surface of the cylindrical portion, and a light emitting portion disposed on the light emitting diode substrate portion, each of which is a light emitting portion of the cylindrical portion. A light source including a plurality of light emitting diodes arranged facing the bottom surface (the invention according to claim 1).

  A reflecting mirror; a cylindrical portion having the optical axis of the reflecting mirror as a central axis; a light emitting diode substrate portion provided on a cylindrical surface of the cylindrical portion; and the light emitting diode substrate portion, and A light source including a plurality of light emitting diodes arranged so that a light emitting portion faces the reflecting surface of the reflecting mirror (the invention according to claim 2).

In the present invention, a light source with high luminous intensity can be obtained by increasing the mounting density of the light-emitting diodes mounted on the light-emitting diode substrate part while keeping the area of the bottom surface of the cylindrical part serving as the light-emitting surface constant.
In addition, the luminous intensity can be easily adjusted by adjusting the mounting density of the light emitting diodes. That is, the mounting density of the light emitting diodes can be made proportional to the area of the cylindrical surface on which the light emitting diode substrate portion is provided, assuming the same light emitting surface area.

In the above invention, the light-emitting diode substrate portion can be mounted by selecting a light-emitting diode that emits visible light, a light-emitting diode that emits ultraviolet light, or a light-emitting diode that emits infrared light according to the purpose of irradiation. (Invention of claim 3 or claim 4).
Whether the purpose of irradiation is to enhance the photosynthetic action of plants, the purpose of pest control, the light source for advertisements and displays, the use for stage lighting, the promotion of human health, and the use for bactericidal action Depending on the purpose of irradiation, such as whether it is used for heating or drying, various light emitting diodes can be selected and mounted.
In particular, when a pseudo white color is desired, red, blue and green light emitting diodes may be attached at the center.

An illumination device that emits pseudo white light using the light source, for example, a surgical lamp can be configured (inventions according to claims 5 and 6).
The illumination device in the present invention is not limited to illumination by visible light, but broadly means an illumination device that uses light of a light source according to the present invention, and thus an illumination device that uses ultraviolet or infrared light. Is also included.

A. Under the condition that the light emitting surface is limited, the mounting density of the light emitting diodes can be increased, and the density can be freely adjusted.
B. Since the mounting density of the light emitting diodes can be increased, a light source with high intensity can be obtained.
C. Since the light emitting diodes are arranged along the cylindrical surface of the cylindrical portion, each light emission of each light emitting diode is cocktailed, and the effect of diffusion and dimming can be obtained.
D. Compared to incandescent lamps with similar illuminance, the amount of heat generation is extremely small, power saving can be realized, and the light source has a long life.
E. Since a pseudo-white color having excellent color rendering properties can be produced, when the illumination device using this light source is, for example, a surgical light, the color of the skin, blood vessels, organs, etc. can be seen in a form close to natural light. Moreover, it becomes a high-intensity surgical light with little heat generation, and can suppress the operator's perspiration. Furthermore, illumination close to a surgical light is possible.

An embodiment of a light source according to the present invention will be described in detail based on the drawings.
1 to 3 are a schematic perspective view, a longitudinal sectional view, and a transverse sectional view of the light source of the first embodiment, and FIGS. 4 to 6 are a schematic perspective view, a longitudinal sectional view, and a transverse sectional view of the light source of the second embodiment. FIG.
In these drawings and the drawings described below, the same components are denoted by the same symbols or phrases, and detailed description thereof is omitted.

  The light source 1 according to the first embodiment includes a columnar body 2 as a cylindrical portion as shown in FIG. 1 and a hexagonal six-stage light emitting diode substrate provided on the columnar surface 20 of the columnar body 2. A plurality of light emitting diodes (also referred to as LEDs) 4 disposed on the light emitting diode substrate section 3 and each light emitting section 40 facing the bottom surface 21 of the cylindrical body 2, and the light emission thereof. A diffusion plate 5 provided on the bottom surface 21 for diffusing the light emission of the diode 4 and a control circuit board 6 disposed on the top surface 22 for controlling the light emission of the light emitting diode 4 are provided.

Although the cylindrical portion is configured as the cylindrical body 2, it may be a polygonal body.
The cylindrical body 2 has a bottom surface 21, a top surface 22, and a cylindrical surface 20 formed by these bus bars. In the present embodiment, the LED 4 is disposed on the cylindrical surface 20 to increase the mounting density of the LEDs 4. The density can be adjusted freely.

A milky white diffusion plate 5 for diffusing light at a predetermined angle is attached to the bottom surface 21 and has a surface emission configuration.
Although not shown, the control circuit board 6 provided on the top surface 22 includes a central control unit (CPU), a driver IC that emits light from the light emitting diode 4 under the control of the CPU, and power to these. A power supply device is provided.

The light emitting diode substrate portion 3 is formed in six corners and six steps along the direction of the central axis 23 of the cylindrical body 2.
Each light emitting diode 4 attached to each stage is disposed with each light emitting portion 40 facing the diffusion plate 5.
Twelve light-emitting diodes 4 are arranged on each of the six sides of each stage, and 72 (12 × 6 sides) LEDs are arranged on each stage, for a total of 432 (72 × 6) in six stages. LED) can be arranged.
The configuration of the light emitting diode substrate 3 is not limited to six corners and six steps, but may be a polygonal or triangular shape close to a circle.
Further, it can be configured from at least one stage to a number of stages that can be stacked along the cylindrical surface 20.

  In order to manufacture the light-emitting diode substrate portion 3, in addition to a configuration in which a hard resin substrate such as a phenol resin (bakelite substrate) is assembled and a configuration in which a flexible substrate is used, a material having heat resistance and insulation, for example, a synthetic resin is integrated. It may be molded.

As the LED 4, a light-emitting diode that emits visible light, a light-emitting diode that emits ultraviolet light, and a light-emitting diode that emits infrared light are selected and attached according to the irradiation purpose of the light source.
For example, as a light source for display, an arrangement method for obtaining pseudo white color is to arrange a red light emitting diode, a blue light emitting diode, a green light emitting diode, etc. in a triangular shape on each stage of the light emitting diode substrate 3. Alternatively, a red light emitting diode may be arranged on the first stage, a blue light emitting diode on the second stage, and a blue light emitting diode on the third stage.
In addition, a red light emitting diode, a blue light emitting diode, and a green light emitting diode may be alternately arranged on each side of each stage.
In addition, light control of the emission color of the LED 4 is performed by the control circuit board 6.

According to the light source 1 of the first embodiment, the following operational effects can be obtained.
1. The LEDs can be mounted at a high density (for example, about 432 in the case of the light source 1) with respect to the light emitting surface formed on the bottom surface 21 of the cylindrical body 2 and having a limited area.
2. Depending on the purpose of use of the light source, a light emitting diode that emits visible light, a light emitting diode that emits ultraviolet light, a light emitting diode that emits infrared light, and the like can be selected and installed.
3. By performing RGB dimming with a red light emitting diode, blue light emitting diode, green light emitting diode, etc., it is possible to create a pseudo white color with excellent color rendering, and irradiate the object with light like natural light of the sun Can do.

Next, a configuration example of the light source 1A of the second embodiment will be described.
In this light source 1A, as shown in FIGS. 4 to 6, a reflecting mirror 7 is arranged at the end of the light emitting diode substrate 3 constituting the light source 1 of the first embodiment.
That is, the light source 1 </ b> A is provided on the reflecting mirror 7 having a concave reflecting surface, the cylindrical body 2 as a cylindrical portion having the optical axis 70 of the reflecting mirror 7 as the central axis 23, and the cylindrical surface 20 of the cylindrical body 2. A hexagonal and six-stage light emitting diode substrate portion 3, a plurality of light emitting diodes 4 arranged on the light emitting diode substrate portion 3, and a diffusion plate 5 that diffuses the reflected light of the light emitting diode 4 And a control circuit board 6 for controlling the light emission of the light emitting diode 4.

A concave reflecting mirror (parabolic reflecting mirror) is used as the reflecting mirror 7, but a spherical mirror (having a curvature with the same radius from the spherical center) may be used.
The reflecting surface 71 of the reflecting mirror 7 may be mirror-finished, or a diffusing surface may be formed by providing irregularities on the surface of the reflecting surface 71.

The light emitting diodes 4 at each stage of the light emitting diode substrate 3 are generally arranged such that each light emitting portion 40 faces the apex (pole) of the reflecting mirror 7.
Therefore, the light emitted from each LED 4 is reflected and diffused by the reflecting surface 71, is dimmed, proceeds to the diffusion plate 5, and becomes surface light emission through the diffusion plate 5.
Therefore, for example, when a red light emitting diode, a blue light emitting diode, a green light emitting diode, or the like is arranged at each stage of the light emitting diode substrate portion 3, a pseudo white color can be obtained.

It is desirable that the reflected light beam reflected by the reflecting surface 71 travels in the direction of the bottom surface 21 as a parallel light beam.
For this purpose, it is necessary to adjust the mounting angle of the light emitting diode that affects the incident angle at each reflection point of the reflecting surface 71 and the reflection angle corresponding to this incident angle.
In the case of the light emitting diode 4 having the light emitting portion 40 provided with a lens portion, a beautiful parallel light beam can be obtained by directing its optical axis to the focal point of the reflecting mirror 7.
Other configurations are the same as those of the light source 1 of the first embodiment, and detailed description thereof is omitted.

According to the light source 1A of the second embodiment, as in the light source 1, 1. LEDs can be mounted at a high density on a limited light emitting surface. 2. Various light emitting diodes can be selected and mounted according to the purpose of use of the light source. By performing RGB dimming with red light emitting diodes, blue light emitting diodes, green light emitting diodes, etc., it is possible to create a pseudo white color with excellent color rendering, and irradiate the object with light like natural light of the sun In addition to being able to
4). Since the reflected light from the reflecting surface of the reflecting mirror is used, the reflecting surface itself becomes a diffusing plate and dimming is easy. Therefore, the attachment of the diffusing plate 5 on the bottom surface 21 is not essential and any Is the configuration,
5. There are effects such as that the reflected light from the reflecting surface of the reflecting mirror can be converted into a parallel light beam.

  Furthermore, as shown in FIG. 7, the light emitting diode substrate portion 3 may be formed in a cylindrical shape so that the LEDs 4 can be arranged.

Next, a configuration example of a lighting device using the light source 1 or 1A will be described.
This illuminating device is a surgical lamp 100 as shown in FIG. 8, and this surgical lamp 100 includes a cap 101, a cover 102, and a handle 103, and a light source 104 provided on the cover 102 has the light source 104. 10 light sources 1 or 1A are attached.
According to the operation light 100, a pseudo white color having excellent color rendering properties can be created, so that the color tone of skin, blood vessels, organs, and the like can be seen in a form close to natural light. Moreover, it becomes a high-intensity surgical light with little heat generation, and can suppress the operator's perspiration. Furthermore, illumination close to a surgical light is possible.

In addition, the light source 1 or 1A may be used for any lighting device such as a room light and a road light, and is also suitable for overall lighting and local lighting.
Further, the illumination device is not limited to illumination by visible light, and any illumination device using the light of the light source 1 or 1A having the above configuration may be used, and illumination devices using ultraviolet light and infrared light are also included. For example, a lighting device for raising animals and a lighting device for growing plants.

The schematic perspective view of the light source which concerns on 1st Embodiment, A longitudinal sectional view of the light source, Cross-sectional view of the light source, The schematic perspective view of the light source which concerns on 2nd Embodiment, A longitudinal sectional view of the light source, Cross-sectional view of the light source, The perspective view of the light emitting diode board | substrate part by another example, It is a perspective view of the operation light using the same light source.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1A Light source 2 Cylindrical body 20 Cylindrical surface 21 Bottom surface 22 Top surface 23 Central axis 3 Light emitting diode board | substrate part 4 Light emitting diode 40 Light emitting part 5 Diffusion plate 6 Control circuit board 7 Reflective mirror 70 Optical axis 71 Reflecting surface

Claims (6)

A tubular part;
A light-emitting diode substrate provided on the cylindrical surface of the cylindrical part;
A light source comprising a plurality of light emitting diodes arranged on the light emitting diode substrate part and arranged such that the light emitting parts are respectively directed toward the bottom surface of the cylindrical part. A reflector,
A cylindrical portion whose central axis is the optical axis of the reflecting mirror;
A light-emitting diode substrate provided on the cylindrical surface of the cylindrical part;
A light source comprising a plurality of light emitting diodes arranged on the light emitting diode substrate part and each light emitting part arranged toward the reflecting surface of the reflecting mirror.   2. The light emitting diode substrate part is provided with a light emitting diode that emits visible light, a light emitting diode that emits ultraviolet light, or a light emitting diode that emits infrared light, according to the purpose of irradiation. The light source described in.   3. The light emitting diode substrate part is provided with a light emitting diode that emits visible light, a light emitting diode that emits ultraviolet light, or a light emitting diode that emits infrared light, depending on the purpose of irradiation. The light source described in 1.   An illumination device using the light source according to claim 1.   An illumination device using the light source according to claim 2.

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