JP2006024383A - Led illumination device and led illumination light source - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an LED illumination device with a long life and an excellent color mixing property. <P>SOLUTION: The LED illumination device 100 is provided with a rotating base board 10, a plurality of LEDs 11 arranged on the surface of the rotating base board against a rotating axis A of the rotating base board 10, a rotating drive part 12 rotating the rotating base board 10 around the rotating axis A, and a lighting circuit 13 electrically connected to the plurality of LEDs. When light from the rotating LEDs is seen by a viewer with rotation of the plurality of LEDs arranged on the surface of the rotating base board 10, chronological color mixing of the plurality of LED lights takes place by time characteristics of sight, as a result of which, the light irradiated from the plurality of LEDs can be recognized as a uniform light of constant color. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a thin LED lighting device, and more particularly, to an LED lighting device having a long life and excellent color mixing.

  LED light sources have excellent characteristics inherent to LEDs, such as extremely small size and long life compared to incandescent lamps and fluorescent lamps. By paying attention to this characteristic, it is expected that the light source having excellent maintainability is applied to a lighting device in which replacement of the light source is difficult.

  However, the LED light source itself cannot emit white light. Therefore, a method is generally used in which a plurality of LEDs that irradiate different lights are gathered and light emitted from these LEDs is mixed to generate white light. As a typical example, there is a method in which LEDs of three colors, red, green, and blue, are gathered and the emitted light is mixed to obtain white.

  However, since LEDs that emit different colors originally have different structures, it is difficult to have constant and uniform characteristics that can be obtained from the same manufacturing process. Therefore, it is inevitable that variations in emission luminance from different LEDs occur. As a result, there is a problem that color unevenness occurs in the light generated by the color mixture. In particular, when an LED lighting device is used as general lighting, the color unevenness of light is regarded as a fatal defect, so how to reduce the color unevenness is an important issue in order to be comparable to other lighting devices. It was. In addition, the prior art regarding color unevenness reduction is disclosed in Patent Documents 1 and 2.

  On the other hand, the LED light source is inferior in luminance as compared with other light sources. For this reason, various technological developments for increasing the brightness have been performed. One of them is a technology for mounting a large number of LEDs at a high density and a technology for increasing the wattage of LED chips. These technologies made it possible to realize a high-luminance small LED lighting device.

However, as the density of LED mounting and the increase in wattage of LED chips progress, the heat generated from the LED chips becomes non-negligible and the temperature of the LED lighting device increases. Since the lifetime of the LED has a characteristic that it is very sensitive to temperature, the problem of an increase in the temperature of the LED lighting device directly leads to a decrease in the lifetime of the LED lighting device. Therefore, in order to maintain the characteristic of long lifetime inherent in the LED, how to increase the heat dissipation effect of the LED lighting device has been an important issue. Patent Documents 3 and 4 disclose conventional techniques for enhancing the heat dissipation effect.
JP 2002-133932 A JP 2003-187605 A JP 2003-092022 A Japanese Patent Laid-Open No. 11-163212

  In order to reduce the color unevenness of white light due to color mixing, some measures have been taken in the past. As a typical example, a diffusion plate or the like is arranged in the LED irradiation direction for the purpose of promoting color mixing. The method (Japanese Unexamined Patent Application Publication No. 2002-133932) is mentioned. However, since the LED has strong finger-lighting properties, it is necessary to dispose the diffusion plate at a certain spatial distance from the LED in order to obtain a sufficient diffusion effect for promoting color mixing. As a result, the arrangement of the diffusion plate is an obstacle to the reduction in size and thickness of the LED lighting device.

  The above method is a method of generating white light by mixing LED lights of different colors, but there is also a method of obtaining white light using one kind of LED. This method is based on a structure in which a blue LED is coated with a phosphor material, and is characterized in that a material that absorbs blue light and emits yellow light is used as the phosphor material. That is, white light is obtained by mixing blue light emitted from the LED itself and yellow light emitted from the phosphor material. Certainly, this method uses only one type of LED, so there is little variation in the characteristics of the LED itself, but it is originally a color mixture of two colors of light, so it is a white light generated by the color mixture of three colors of light. In comparison, it has an essential problem that it is inferior in color rendering.

  On the other hand, in order to prevent the temperature rise of the LED lighting device due to the heat generated from the LED chip, several means have been conventionally used. As a typical example, the heat sink is brought into contact with the substrate on which the LED chip is mounted. Method (Japanese Patent Laid-Open No. 2003-92003). However, in order to obtain a sufficient heat dissipation effect against the heat generated from the LEDs mounted at high density, the heat sink having an area several times larger than the LED mounting area or many times larger than the LED mounting board A heat sink having a thickness is required. As a result, the installation of the heat sink is an obstacle to the reduction in size and thickness of the LED lighting device.

  As described above, in the conventional LED lighting device, excellent characteristics such as long life and miniaturization inherent to the LED cannot be fully utilized, and there are many solutions to the realization of a small and thin LED lighting device. There are still challenges.

  The present invention has been made in view of the above points, and among the factors that hinder the miniaturization and thinning of LED lighting devices, particularly important “reduction of color unevenness” and “improvement of heat dissipation effect”. The present invention provides an LED lighting device that solves two problems simultaneously and has a long life and excellent color mixing.

  The LED illumination device of the present invention includes a rotating substrate, a plurality of LEDs arranged on the surface of the rotating substrate with respect to the rotating shaft of the rotating substrate, and a rotation driving unit that rotates the rotating substrate with respect to the rotating shaft. And a lighting circuit electrically connected to the plurality of LEDs.

  With the above configuration, when a plurality of LEDs arranged on the rotating substrate rotate, when light from the rotating LEDs is visually recognized by the human eye, in addition to spatial color mixing of the plurality of LED lights, a visual time Addition of temporal color mixing of a plurality of LED lights depending on characteristics promotes color mixing, and as a result, color unevenness can be reduced. In addition, since the air cooling action simultaneously acts on the LEDs arranged on the substrate by the rotation of the rotating substrate, the heat dissipation effect is enhanced, and the temperature rise of the LED lighting device due to the heat generated from the LED chip can be prevented.

  In a preferred embodiment, the plurality of LEDs may be composed of a plurality of LEDs having different emission colors.

  Due to the rotation of the rotating substrate, the light emitted from the plurality of LEDs is viewed as uniform light of a certain color. Further, the light emitted from the plurality of LEDs is visually recognized as white uniform light by the rotation of the rotating substrate.

  In a preferred embodiment, it is preferable that the rotating substrate is rotated at a rotation speed of at least 100 rpm by the rotation driving unit.

  In a preferred embodiment, the plurality of LEDs are arranged on concentric circles on the surface of the rotating substrate. In addition, it is preferable that each LED arrange | positioned on the concentric circle which has a different diameter is arrange | positioned with the substantially same space | interval along the circumference of the said concentric circle. In addition, among the LEDs, LEDs having at least the same emission color may be arranged at substantially the same intervals along the circumference of the concentric circles.

  In a preferred embodiment, the plurality of LEDs having the first emission color and the plurality of LEDs having the second emission color are arranged on the rotating substrate, and the first light emission is caused by the rotation of the rotating substrate. The luminance per unit area of the emitted light from the plurality of LEDs having a color and the luminance per unit area of the emitted light from the plurality of LEDs having the second emission color have a certain ratio.

  In a preferred embodiment, the rotating board includes a rotating stage and an LED mounting board, the plurality of LEDs are mounted on the LED mounting board, and the LED mounting board is on the rotating stage. Is detachably mounted.

  In addition, an LED power supply terminal is provided at the central axis portion of the LED mounting substrate, and the power supply terminal is electrically connected to the lighting circuit.

  The LED mounting board may be disk-shaped, and the plurality of LEDs are preferably arranged and mounted on concentric circles of the LED mounting board.

  In a preferred embodiment, the rotating substrate has a plurality of through holes penetrating from the front surface to the back surface of the rotating substrate. Further, the plurality of through holes may be formed on the concentric circles of the rotating substrate with a constant interval.

  The LED mounting board may be disk-shaped, and the plurality of LEDs are preferably arranged and mounted on concentric circles of the LED mounting board. The rotating substrate is covered with a transparent cover, and intake and exhaust holes are formed on the side surface of the transparent cover.

  The intake / exhaust holes are preferably formed at opposing positions on the side surface of the transparent cover, and are sucked from one intake / exhaust hole and exhausted from another intake / exhaust hole.

  The surface of the rotating substrate may be a reflecting surface that reflects light emitted from the LED.

  In a preferred embodiment, the LED illumination device is used as a backlight of a liquid crystal display device.

  The LED illumination light source of the present invention includes an LED mounting board, a plurality of LEDs mounted on the surface of the LED mounting board, and a power supply terminal for LED provided on a central axis portion of the LED mounting board.

  In a preferred embodiment, the LED mounting substrate has a disk shape, and the plurality of LEDs are mounted on concentric circles on the surface of the LED mounting substrate.

  The LED lighting device according to the present invention rotates a plurality of LEDs arranged on a rotating substrate, so that when the light from the rotating LEDs is visually recognized by the human eye, the plurality of LED lights are spatially mixed. In addition, since color mixing is promoted by adding temporal color mixing based on visual temporal characteristics, color unevenness can be reduced. In addition, since the air cooling action works simultaneously on the LEDs arranged there by the rotation of the rotating substrate, the heat radiation action works, and the temperature rise of the LED lighting device due to the heat generated from the LED chip can be prevented.

  In addition, since the above-described effect due to the rotation of the rotating substrate on which a plurality of LEDs are arranged can be realized by adding a thin rotating mechanism, it has been conventionally required for the arrangement of diffusion plates and heat sinks as color mixing and heat dissipation means. Therefore, a small and thin LED lighting device can be realized.

  Furthermore, in order to effectively promote color mixing by rotation, a rotation speed of about 100 rpm is sufficient, so a high-speed and high-performance rotation mechanism is not required, and an inexpensive rotation mechanism is used in the present invention. LED lighting device can be realized.

  In addition, since the LED illumination light source according to the present invention can be attached to and detached from the LED illumination device, if the maintenance is easy and the shape and the like are unified, an illumination light source corresponding to various variations can be provided. .

  The conventional generation of white light by color mixing is, so to speak, spatial color mixing, in other words, effective color mixing is performed by the spatial resolution of human vision, and such spatial color mixing is effective. In order to achieve this, it is essential to secure physical space. This means that as long as the spatial color mixing method is adopted, there is a limit to the reduction in size and thickness of the lighting device.

  Therefore, the inventor of the present application adds a temporal color mixing effect caused by the temporal resolution of human vision in addition to the spatial color mixing effect caused by the human visual spatial resolution, thereby providing a color mixing effect. We focused on the point that can promote. That is, a plurality of LEDs are spatially arranged on the substrate to achieve spatial color mixing, and the color mixing is promoted by adding temporal color mixing by rotating the substrate on which the LEDs are arranged. It becomes possible. In consideration of the temporal resolution of human vision, the promotion of the color mixing effect by the addition of temporal color mixing by such rotation is sufficient to give a certain rotation speed, for example, a rotation speed of about 100 rpm. In addition, if the rotational speed is equal to or higher than a certain rotational speed, even if the rotational speed varies, the color mixing effect is not affected. In other words, the color unevenness reduction effect of the present invention can be realized with an inexpensive rotation mechanism without using a high-speed and high-accuracy rotation mechanism as used in electronic devices such as CDs and DVDs.

  Embodiments of the present invention will be described below with reference to the drawings. In the following drawings, components having substantially the same function are denoted by the same reference numerals for the sake of simplicity. In addition, this invention is not limited to the following embodiment.

(Embodiment 1)
1 and 2 are diagrams showing a basic configuration of LED lighting apparatus 100 according to Embodiment 1 of the present invention. FIG. 1 is a plan view of the LED lighting device 100, and FIG. 2 is a side view of the LED lighting device 100. As shown in FIGS. 1 and 2, the LED lighting device 100 rotates the rotating substrate 10, the plurality of LEDs 11 arranged on the rotating substrate surface with respect to the rotation axis A of the rotating substrate 10, and the rotating substrate 10. The rotation drive part 12 rotated with respect to the axis | shaft A and the lighting circuit 13 electrically connected with several LED are provided.

  Light emitted from the plurality of LEDs 11 arranged on the surface of the rotating substrate 10 is recognized as light with uneven color when spatial color mixing is insufficient, but by rotating the rotating substrate 10, Since temporal color mixing by rotation is added, the effect of color mixing is promoted and color unevenness can be reduced. Moreover, since the air cooling effect | action acts with respect to LED11 arrange | positioned there by rotation of the rotation board | substrate 10, a thermal radiation effect increases and it can prevent the temperature rise of the LED lighting apparatus by the heat_generation | fever from LED chip.

  When a plurality of LEDs having different emission colors are arranged, the light emitted from the plurality of LEDs is a fixed color that is uniquely determined from the chromaticity and the light intensity of the light emitted from each LED regardless of the rotation speed. Visualized as uniform light. For example, when three types of LEDs having red, green, and blue emission colors are arranged, it is visually recognized as white uniform light. It should be noted that the same effect can be expected for the promotion of color mixing by such rotation even when a plurality of LEDs having one kind of emission color are arranged. That is, even if one type of LED is used, if each LED has a variation in luminous intensity, if it does not give rotation, what is recognized as non-uniform light as a whole can be reduced by applying rotation. The effect of being recognized as such light is obtained.

  In the present invention, the rotation speed of the rotating substrate necessary for obtaining the effect of promoting color mixing by rotation depends on the density of a plurality of LEDs arranged on the rotating substrate, that is, the degree of spatial color mixing, but the rotation speed is about 100 rpm. If given, the effect can be sufficiently exhibited.

  Note that the effect of color mixing due to rotation does not change in a range exceeding a certain rotation speed, and therefore no further rotation mechanism is required. Further, the variation in the rotation speed is not affected by the color mixing effect as long as the rotation speed is equal to or higher than a certain rotation speed. Therefore, in implementing the present invention, a high-speed and high-accuracy rotation mechanism is not required, and an LED illumination device that exhibits the effects of the present invention can be realized using an inexpensive rotation mechanism.

  Next, an example of a specific arrangement of LEDs will be described with reference to FIG. As shown in FIG. 3, the red LED 21, the green LED 22, and the blue LED 23 are arranged on the surface of the rotating substrate 10 on the concentric circles d <b> 1 to d <b> 4 having different diameters. Each LED is arranged on the concentric circle d1 of the innermost shell and the concentric circle d4 of the outermost shell, one by one.

  The LEDs are arranged at substantially constant intervals along the circumference of the concentric circles, but the LEDs arranged on the concentric circles having different diameters are arranged at substantially the same intervals along the circumference of the respective concentric circles. Arranged with it. The reason why the intervals are the same in each concentric circle is to align the movement pitch of the LEDs on each concentric circle. With the arrangement of the LEDs, the light emitted from the plurality of LEDs can be viewed as white uniform light by the rotation of the rotating substrate 10. The above arrangement is an example in which the emission luminance of each LED is substantially the same. When the LED emission luminance is different, the number of LEDs is set according to the difference in the emission luminance of each LED. It is necessary to adjust. Further, even if it is white, there is a certain chromaticity range (for example, black body locus 1000K to 2000K, within Duv15, etc.), and these chromaticity adjustments are further performed by adjusting the luminance of each LED. Can do.

  The above example shows an example in which the LEDs are arranged concentrically, but see FIG. 4 for general guidelines on effective LED placement to obtain uniform light of constant color by rotation. The following will be explained. In order to simplify the description, a case where two types of LEDs are arranged will be described as an example.

  As shown in FIG. 4, the LEDs 21a and 21b having the first emission color and the LEDs 22a and 22b having the second emission color are arranged at the positions shown in FIG. Think. When the rotating substrate 10 was rotated at a constant angular velocity ω for a predetermined time t, each LED moved in arcuate regions A, B, C, and D having an angle of ωt, as shown in FIG. It will be.

  As can be seen from FIG. 4, the moving area A of the LEDs 21a and the moving area C of the LEDs 21b arranged on different concentric circles are different. Therefore, the luminance per unit area obtained from the LED 21a is smaller than the luminance per unit area obtained from the LED 21b. In other words, the brightness recognized by the rotation of the LED 21a is smaller than that of the LED 21b, and the light is not uniform. In other words, in order to obtain uniform light, the luminance per unit area of the light emitted from the LED 21a and the LED 21b must be the same. The method shown in FIG. 3 in which the LEDs are arranged on the concentric circles at a constant interval is an example of an adjustment method for making the luminance per unit area the same.

  On the other hand, a certain color obtained by mixing different emission colors by rotation is determined by the ratio of the luminance per unit area from the LED 21a and the luminance of the unit area from the LED 22a. As shown in FIG. 4, since the moving area A of the LED 21a and the moving area B of the LED 21b arranged on the same concentric circle are the same, the adjustment of the luminance ratio per unit area of the LED 21a and the LED 21b is inherent. Can be performed by adjusting the ratio of the luminances (luminances per unit). Or it is also possible to adjust with the ratio of the number of LED21a and LED21b effectively arrange | positioned in the movement areas A and B. FIG.

  By arranging a plurality of LEDs on the rotating substrate according to the above general guidelines, it becomes possible to obtain uniform light of a certain color. As a simpler method, FIG. 5 or FIG. An arrangement method as shown can also be taken. In order to simplify the description, a case where two types of LEDs are arranged will be described as an example.

  In the arrangement example shown in FIG. 5, the surface of the rotating substrate 10 is virtually divided into areas 31 made of right-angled triangles having the same area, and LEDs 21 and LEDs 22 having different emission colors are alternately arranged in each area 31. Is. Thereby, the ratio of the luminance per unit area from the LED 21 and the luminance of the unit area from the LED 22 can be set to a substantially constant value, and as a result, uniform light of a constant color can be obtained by rotation. Can do.

  In the arrangement example shown in FIG. 6, the surface of the rotating substrate 10 is virtually divided into areas 32 made of squares having the same area, and LEDs 21 and LEDs 22 having different emission colors are alternately arranged in each area 32. It is. Thereby, similarly to the arrangement example shown in FIG. 5, the ratio of the luminance per unit area from the LED 21 and the luminance of the unit area from the LED 22 can be set to a substantially constant value. Uniform light of a certain color can be obtained.

  The above arrangement example has been described assuming that one LED is arranged in each area. However, the arrangement is appropriately arranged according to a desired color to be obtained by color mixing by rotation, light emission luminance of each LED, and the like. The number of LEDs to be adjusted can be adjusted.

  Next, a method for supplying power from the lighting circuit to the plurality of LEDs arranged on the rotating substrate 10 will be described with reference to FIG. As shown in FIG. 7, a plurality of LEDs 21, 22, and 23 of three colors (red, green, and blue) are arranged on the rotating substrate 10. In FIG. 7, only the LEDs 21, 22, and 23 arranged three by three are displayed, and the other arranged LEDs are omitted.

  As shown in FIG. 7, a power supply terminal 40 having a positive power supply terminal and a negative power supply terminal is provided at the center of the rotating board 10, and a power supply for supplying a positive power supply to the inside and outside of the rotating board 10. A line 41 and a power supply line 42 for supplying a negative power supply are embedded in the rotating substrate 10 in a concentric manner. Each power supply terminal (not shown) of the power supply terminal 40 is connected to positive and negative power supply lines 41 and 42 by wirings 43 and 44. The LEDs 21, 22, and 23 are connected in series, and the LEDs 21, 22, and 23 located in the innermost outline are connected to a power supply line 41 that supplies positive power, and the LEDs 21, 22, and 23 located in the outermost outline Reference numeral 23 denotes a power supply line 42 that supplies a negative power source. The power supply terminal 40 is connected to a lighting circuit (not shown) provided in the LED lighting device.

  With the connection as described above, power is supplied to each of the LEDs 21, 22, and 23 arranged on the rotating substrate 10, but power supply to the three color LEDs is performed by a common power supply line. Independent lighting control is not possible for each type of LED. Therefore, the color obtained by the color mixture by rotation based on the predetermined LED arrangement is limited to a certain color.

  Therefore, when it is desired to control a color obtained by color mixing by rotation to a desired color, it is necessary to control lighting of the three color LEDs independently. FIG. 8 is a diagram showing the configuration of the wiring made for such a purpose.

  The basic configuration is the same as the configuration shown in FIG. 7, and the power supply line 41 that supplies positive power and the power supply line 42 that supplies negative power are each divided into three independent lines. The point is different. Correspondingly, three independent sets of positive and negative power supply terminals (not shown) are formed in the power supply terminal 40, and each power supply terminal and the positive and negative power supply lines 41 and 42 are connected to wirings 43a, 43b, 43c, 44a, 44b and 44c are connected to each other. Thereby, since lighting of the three color LEDs is independently controlled, by applying a predetermined voltage to each LED, desired color light can be obtained by color mixture by rotation.

  Next, a method for arranging LEDs on the rotating substrate 10 and a method for connecting the LEDs arranged on the rotating substrate 10 and the LEDs will be described with reference to FIG.

  As shown in FIG. 9, the electrodes (not shown) of the LEDs 21a, 21b, and 21c are mounted by flip chip method via electrodes 50 and bumps 51 formed on the surface of the rotating substrate (partially enlarged) 10. Has been. A (negative) power supply line 42 is embedded in the rotating substrate 10, and is connected to a power supply terminal (not shown) via a wiring 44 embedded in the rotating substrate 10. One electrode of the LED 21 located on the outermost side is connected to the power supply line 42, and the other electrode of the LED 21 is connected to one electrode of the adjacent LED 21 b by a wiring 52 formed on the rotating substrate 10. . Similarly, the LED 21b is wired and connected in series with the adjacent LED 21c.

  The structure of the rotation driving unit 12 in the LED lighting device of the present invention is not particularly limited as long as the rotating substrate 10 is rotated. However, in order to cope with the thinning of the LED lighting device, the thin structure is used. Are preferred. For example, if a spindle motor as disclosed in Japanese Patent Application Laid-Open No. 2003-324923 is employed, the motor unit and the rotating substrate can be integrated, so that a thinner LED lighting device is realized. it can.

(Embodiment 2)
In the LED lighting device of the present invention, the plurality of LEDs are arranged on the surface of the rotating substrate. However, as shown in FIG. 9, when the LEDs are directly mounted on the surface of the rotating substrate, the LEDs are arranged on the rotating substrate. The LED becomes fixed. Therefore, the light colors that can be used as such a lighting device are limited, and cannot be used as a lighting device that produces various variations of colors.

  The LED lighting apparatus according to Embodiment 2 of the present invention realizes an LED lighting apparatus that can meet such a demand, and is characterized in that a rotating board on which an LED is mounted is detachable.

  FIGS. 10A and 10B are diagrams showing the configuration of the rotatable substrate 10 that can be worn in the second embodiment. As shown in FIG. 10 (a), the disk-shaped rotating stage 10a has a protrusion-shaped chuck portion 60 formed at the center thereof, and a disk-shaped LED mounting substrate 10b is disposed above it. Yes. A plurality of LEDs 21 are mounted on the surface of the LED mounting substrate 10b, and a cylindrical recess 61 is formed at the center thereof.

  As shown in FIG. 10B, the LED mounting substrate 10b is placed on the rotating stage 10a so that the chuck portion 60 of the rotating stage 10a and the recess 61 of the LED mounting substrate 10b are engaged with each other. can do. The rotation stage 10a is controlled to be rotatable, and the LED mounting board 10b mounted thereon can also rotate integrally with the rotation stage 10a.

  The LED mounting substrate 10b is detachably mounted on the rotary stage 10a, but power must be supplied to the LED through the rotary stage 10a. Therefore, a method for supplying power to the LED mounted on the surface of the LED mounting substrate 10b will be described with reference to FIGS.

  FIG. 11 is an enlarged view of the structure of the chuck portion 60 in the rotary stage 10a. As shown in FIG. 11, two power supply terminals 62 a and 62 b are formed on the side surface of the chuck portion 60 along the outer periphery.

  On the other hand, FIG. 12 is an enlarged view of the configuration of the recess 61 in the LED mounting substrate 10b. As shown in FIG. 12, two power supply terminals 63 a and 63 b are formed on the inner side surface of the recess 61 along the inner periphery, like the chuck portion 60.

  As shown in FIG. 10 (b), when the LED mounting substrate 10b is placed on the rotating stage 10a, the recess 61 is fitted into the chuck portion 60, so that the respective power supply terminals come into contact with each other and become conductive. It becomes a state. The power supply to the LED mounted on the LED mounting substrate 10b is performed in a manner similar to the method shown in FIGS. 7 to 9 from the power supply terminals 63a and 63b formed in the recess 61 to the electrodes of the respective LEDs. This is done by connecting with.

  Here, for the sake of simplicity, only two positive and negative power supply terminals are drawn here. However, for example, when it is desired to supply independent power to three-color LEDs, the six power supply terminals are arranged on the outer periphery. It may be formed along.

  The LED lighting device according to the second embodiment is different by replacing the LED mounting board 10b because the LED mounting board 10b on which a plurality of LEDs are mounted is detachably mounted on the rotating stage 10a. Colored illumination light can be obtained. Moreover, since the LED mounting substrate 10 itself is provided with a power supply terminal for LED, if the shape of the power supply terminal is unified, it can be mounted on different lighting devices, and can be used as a general-purpose LED illumination light source. Can also be used. Furthermore, since only the LED mounting board can be removed, maintenance such as when an LED breaks down becomes easy.

(Embodiment 3)
The LED lighting device of the present invention has a visual effect of recognizing as uniform light of a certain color by adding temporal color mixing by rotation in addition to spatial color mixing. Since the air cooling action works on the LED, the heat radiation action works, and the effect that the temperature rise of the LED lighting device due to the heat generated from the LED chip can be prevented can be exhibited.

  FIGS. 13A and 13B are diagrams illustrating the configuration of the LED lighting device according to the third embodiment, in which a device for further increasing the heat radiation effect by rotation is added.

  Fig.13 (a) is the figure which looked at the LED lighting apparatus 110 from the plane, and FIG.13 (b) is the figure which looked at the LED lighting apparatus 110 from the side. As shown in FIGS. 13A and 13B, a plurality of LEDs (only some of the LEDs are displayed here) are arranged on the rotating substrate 10, and the surface of the rotating substrate 10 is arranged on the rotating substrate 10. A plurality of through-holes 70 penetrating from the surface to the back surface are formed. The through holes 70 are formed on the concentric circles at substantially constant intervals. However, the positions of the through holes 70 may be appropriately determined according to the LED arrangement state or the like.

  Further, in order to further enhance the heat radiation effect due to rotation, as shown in FIG. 14, if the through hole 70 is formed obliquely and a flange 71 is provided near the upper portion of the through hole 70, the through hole 70 is provided. The airflow that entered from the bottom of the LED is bent toward the LED chip 11 by the flange 71, and the heat dissipation action of the LED 11 can be further enhanced.

  FIG. 15 shows an LED illuminating device having a structure in which the rotating substrate 10 is covered with a transparent cover 80. Air intake and exhaust holes 81 and 82 are provided on the side surface of the transparent cover 80 to make the air flow more efficient. Is. In a general lighting device, the light emitted from the LED 11 disposed on the rotating substrate 10 is not directly seen, but it is usually covered with a transparent cover and the light passing therethrough is seen. Therefore, the space covered with the transparent cover tends to accumulate heat dissipation from the LED, which causes a decrease in heat dissipation effect.

  Therefore, as shown in FIG. 15, if air intake and exhaust holes 81 and 82 are provided on the side surface of the transparent cover 80, an air flow that is sucked from one air intake and exhaust hole 81 and exhausted from the other air intake and exhaust hole 82 is obtained. Efficient heat dissipation can be performed without heat being accumulated in the space covered with the transparent cover 80. The transparent cover 80 only needs to be transparent at least in the emission direction of the LED light arranged on the rotating substrate 10.

  By the way, although the technique which mounts the light-emitting body of three colors (red, green, blue) on a rotating body is disclosed by Unexamined-Japanese-Patent No. 2004-55563, the technique disclosed by the said patent document is a backlight. In the so-called field sequential type color liquid crystal display element, light of three color light emitters mounted on the rotating body is sequentially incident on the light guide plate used by rotating the rotating body. The purpose is to realize time-division driving of the backlight. Therefore, in order to achieve this object, the light emitter must be configured to be mounted on the outer peripheral surface (a surface parallel to the rotation axis) of the rotating body. As in the present invention, the rotating surface of the rotating substrate is used. This is completely different from the configuration in which the LEDs are arranged on the (surface perpendicular to the rotation axis). Further, the patent document does not disclose or suggest a technique for obtaining white light by mixing three colors of light by rotation, which is an object of the present invention. Therefore, the “rotor mounted with a plurality of light emitters” disclosed in the patent document is completely different from the present invention in terms of purpose, configuration and effect, and the present invention can be easily conceived from such prior art. It is not a thing.

  As mentioned above, although this invention was demonstrated by suitable embodiment, such description is not a limitation matter and of course various modifications are possible. For example, by making the surface of the rotating substrate 10 a reflective surface that reflects light emitted from the LEDs, the emission efficiency can be further increased. In addition, since the color mixing effect due to rotation cannot be obtained at the center portion of the rotating substrate 10, white light uniformity can be further improved by arranging a white LED at the center portion. Furthermore, since the LED illumination device of the present invention is suitable for thinning, it can also be used as a backlight of a liquid crystal display device.

  According to the present invention, it is possible to provide an LED lighting device having a long life and excellent color mixing.

The top view which shows the structure of the LED lighting apparatus 100 which concerns on Embodiment 1 of this invention. Sectional drawing which shows the structure of the LED lighting apparatus 100 which concerns on Embodiment 1 of this invention. The figure which shows arrangement | positioning of LED on the rotation board in Embodiment 1 of this invention. The figure explaining the optimal arrangement | positioning of LED in Embodiment 1 of this invention The figure which shows an example of arrangement | positioning of LED in Embodiment 1 of this invention The figure which shows another example of arrangement | positioning of LED in Embodiment 1 of this invention. The figure which shows the wiring method of LED in Embodiment 1 of this invention The figure which shows the other wiring method of LED in Embodiment 1 of this invention. The figure which shows the mounting method of LED in Embodiment 1 of this invention. (A) is a schematic diagram before mounting | wearing of the LED lighting apparatus concerning Embodiment 2 of this invention, (b) is a schematic diagram after mounting | wearing of the LED lighting apparatus. The figure which shows the structure of the electric power feeding terminal of the rotation stage in Embodiment 2 of this invention. The figure which shows the structure of the electric power feeding terminal of the LED mounting board in Embodiment 2 of this invention. (A) is a top view which shows the structure of the LED lighting apparatus 110 concerning Embodiment 3 of this invention, (b) is sectional drawing which shows the structure of the LED lighting apparatus 110 The figure which shows the structure of the through-hole provided in the rotation board in Embodiment 3 of this invention. The figure which shows the structure of the transparent cover provided in the rotating substrate in Embodiment 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rotation board 10a Rotation stage 10b LED mounting board 11 LED chip 12 Rotation drive part 13 Lighting circuit 21, 22, 23 LED
40, 62, 63 Power supply terminal 41, 42 Power supply line 43, 44 Wiring 50 Electrode 51 Bump 60 Chuck part 61 Recess 70 Through hole 71 庇 80 Transparent cover
81,82 Intake / exhaust hole 100,110 LED lighting device

Claims (17)

A rotating substrate;
A plurality of LEDs arranged on the surface of the rotating substrate with respect to the rotation axis of the rotating substrate;
A rotation drive unit that rotates the rotating substrate with respect to a rotation axis;
An LED lighting device comprising a lighting circuit electrically connected to the plurality of LEDs. The LED lighting device according to claim 1, wherein the plurality of LEDs includes a plurality of LEDs having different emission colors. The LED illumination device according to claim 2, wherein the light emitted from the plurality of LEDs is viewed as uniform light of a certain color by the rotation of the rotating substrate. The LED illumination device according to claim 3, wherein the light emitted from the plurality of LEDs is visually recognized as white uniform light by the rotation of the rotating substrate. 5. The LED lighting device according to claim 3, wherein the rotating substrate is rotated at a rotation speed of 100 rpm or more by the rotation driving unit. The LED lighting device according to claim 1, wherein the plurality of LEDs are arranged on a concentric circle on the surface of the rotating substrate. The LED lighting device according to claim 6, wherein the LEDs arranged on concentric circles having different diameters are arranged at substantially the same interval along a circumference of the concentric circles. The LED illumination device according to claim 6, wherein among the LEDs, LEDs having at least the same emission color are arranged at substantially the same interval along the circumference of the concentric circle. A plurality of LEDs having a first emission color and a plurality of LEDs having a second emission color are disposed on the rotating substrate,
Due to the rotation of the rotating substrate, luminance per unit area of light emitted from the plurality of LEDs having the first emission color and luminance per unit area of light emitted from the plurality of LEDs having the second emission color are increased. The LED lighting device according to claim 3, wherein the LED lighting device has a certain ratio. The rotating board includes a rotating stage and an LED mounting board,
The plurality of LEDs are mounted on the LED mounting substrate,
The LED lighting device according to claim 1, wherein the LED mounting substrate is detachably mounted on the rotating stage. The LED lighting device according to claim 10, wherein an LED power supply terminal is provided at a central axis portion of the LED mounting substrate, and the power supply terminal is electrically connected to the lighting circuit. The LED lighting device according to claim 1, wherein the rotating substrate has a plurality of through holes penetrating from the front surface to the back surface of the rotating substrate. The LED lighting device according to claim 1, wherein the rotating substrate is covered with a transparent cover, and an intake / exhaust hole is formed on a side surface of the transparent cover. The LED lighting device according to claim 13, wherein the intake / exhaust hole is formed at a position opposite to a side surface of the transparent cover, and is sucked from one intake / exhaust hole and exhausted from another intake / exhaust hole. An LED mounting board;
A plurality of LEDs mounted on the surface of the LED mounting substrate;
The LED illumination light source provided with the electric power feeding terminal for LED provided in the center axis | shaft part of the said LED mounting substrate. The LED mounting substrate has a disk shape,
The LED illumination light source according to claim 15, wherein the plurality of LEDs are mounted on concentric circles on the surface of the LED mounting substrate. The LED lighting device according to claim 1, wherein the LED lighting device is used as a backlight of a liquid crystal display device.

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