JP2006260947A - Solid luminescence type lighting device and spot light - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solid luminescence type lighting device and a spot light capable of suppressing the lowering of an irradiation light quantity while reducing color shading when using a plurality of solid luminous elements with different luminescent colors. <P>SOLUTION: This solid luminescence type lighting device is provided with a first solid luminous element 13a having directivity and emitting light of a specific color, a second solid luminous element 13b having directivity and emitting light of a color different from the first solid luminous element, a luminaire body 19 housing the first and second solid luminous elements for mixing emitted light from the solid luminous element and projecting it in a prescribed direction, and a translucent part 18 located in a light path of the mixed emitted light and constituted so that a light dispersion property changes in a direction crossing the light path. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a solid light emitting illumination device and a spotlight using a solid light emitting element such as a light emitting diode (LED).

  In general, halogen light bulbs and discharge lamps are widely used as light sources for spotlights used for lighting in theaters and television studios. Attention has been focused on the use of these elements as light sources for lights.

  This type of solid state light emitting device can obtain a light amount of relatively high output with respect to the substantial size of the light emitting region, and since the light emitting region is small, it is easy to control the light distribution and is combined with a resin lens or the like. Thus, there is an advantage that the directivity of light can be easily determined. For this reason, it is suitable for light irradiation only in a desired region, and it is expected that effective light conversion efficiency is expected to increase as much as unnecessary light leakage does not occur.

  In LED spotlights using light emitting diodes (LEDs), taking advantage of this advantage, a large number of directional LEDs are arranged as light sources, and the irradiation beam of each LED is condensed at one point to create a virtual single point light source unit And the illuminance and illuminance distribution on the irradiated surface are changed by changing the positional relationship between the light source unit and the lens (see, for example, Patent Document 1).

  Further, the present applicants have arranged a plurality of light emitting diodes of different emission colors each capable of controlling the amount of light as a light source, and mixed the emitted light of the light emitting diodes, thereby changing the color tone of the irradiation light. Spotlight developed.

Here, when the illuminance and illuminance distribution of the irradiated surface are changed by moving the lens position, especially when the irradiation light is in a wide range, the directivity of the emitted light from the LED is also strong. As a result, the uniformity on the irradiated surface deteriorates, and the dissimilar light emitted from each light-emitting diode is likely to be a color spot, so a diffuser that diffuses the transmitted light uniformly in front of the lens to eliminate this. This improves the uniformity of the final irradiation light and color spots.
Japanese Patent Laid-Open No. 2001-307502 (FIGS. 2 and 3)

  However, when a diffuser plate that diffuses uniformly is used, the light of the contoured portion of the mixed radiated light is also diffused and spread to the outside, so the portion of the irradiated light that has passed through the diffuser plate corresponds to the contoured portion. However, there is a problem that the light amount at the center where the light amount is generally required is relatively lowered.

  In order to improve these, it is conceivable to reduce the degree of diffusion of the diffusion plate. However, if the diffusion is weakened, there is a problem that the light emission colors of different light emitting diodes are easily recognized as color spots. It will be lost.

  Then, an object of this invention is to provide the solid light emission type illuminating device and spotlight which can suppress the fall of the amount of irradiation light, reducing generation | occurrence | production of a color spot.

  The solid-state light-emitting illuminating device according to claim 1 has directivity, a first solid-state light-emitting element configured to emit light of a specific light color, directivity, and first The second solid-state light-emitting element configured to emit light of a light color different from that of the solid-state light-emitting element and the emitted light from the first and second solid-state light-emitting elements are mixed and projected in a predetermined direction. As described above, an instrument main body that accommodates the first and second solid state light emitting devices, and a translucent portion that is located in the optical path of the mixed radiated light and has different light diffusion characteristics in the direction intersecting the optical path, It is characterized by having.

  The definitions and technical meanings of the terms in the present invention and the following invention are as follows. Terms not particularly specified have general definitions or meanings usually assumed by those skilled in the art.

  The directivity of a solid-state light emitting device means the direction of light emitted from the device, and having directivity means whether the light emission direction is wide or narrow in all directions. Means that it is in a predetermined direction. For example, this corresponds to a case where a resin lens or the like for condensing the emitted light is attached to a substantial light emitting portion of the light emitting diode.

  Typically, solid-state light-emitting elements include light-emitting diode elements, solid-state light-emitting devices using semiconductor lasers or carbon nanotubes, but different types of light-emitting elements as required regardless of the light-emitting principle or element form. Can be used.

  Further, to emit a specific light color for the first solid state light emitting device means that the principal light emitted from the solid state light emitting device is in an arbitrary predetermined chromaticity region. For example, in a case where a spotlight often used for television or stage lighting is used, a light emission color corresponding to white light or the like can be selected as a specific light color, while the second solid state light emission. The different light colors in the element can be light colors corresponding to complementary color light such as blue and red light used for changing the color tone, for example. In addition to the direct emission color of the solid state light emitting device itself being a specific or non-specific light color, for example, the direct emission color via a color conversion filter or a fluorescent agent incorporated in the device. May be converted into a specific or non-specific light color.

  The light diffusing characteristic means an optical diffusing characteristic with respect to the emitted light of the first and second solid state light emitting elements, and therefore, the light transmitting part in the present invention has at least a part thereof having a substantial diffusing effect, The diffusion degree is substantially changed in a direction intersecting with a direction (optical path) in which the mixed light is incident. The change in the degree of diffusion is preferably continuous, but may be stepwise or discrete as desired. For example, the diffusive transparency that can control the directivity of the diffused light. Members such as optical resin and glass diffusion plates can be used.

  The spotlight according to claim 2 has a directivity, a first solid state light emitting device configured to emit light of a specific light color, a directivity and the first solid state light emitting device. A second solid-state light emitting device configured to emit light of a different light color from the first solid-state light emitting device, and the first and second solid-state light emitting devices are mixed with each other and projected in a predetermined direction. An instrument body that houses the first and second solid-state light emitting elements, a translucent portion that is located in the optical path of the mixed radiated light, and is configured to have different light diffusion characteristics in a direction intersecting the optical path; And an optical lens that adjusts the irradiation range of the radiated light that has passed through the translucent portion, and the first and second solid state light emitting elements. And a lighting device that supplies suitable lighting power.

  According to the first aspect of the present invention, since the light transmissive portion is configured so as to be located in the optical path of the mixed radiated light and have different light diffusion characteristics in the direction intersecting with the optical path, the diffusing action is relatively low. The light-transmitting part with a strong light can reduce the color spots of the light emission colors of different light-emitting diodes, and the light-transmitting part with a relatively weak diffusing action can prevent the irradiation light quantity from decreasing. As a whole, it is possible to provide a solid light-emitting illuminating device that can suppress the decrease in the amount of irradiation light while reducing the occurrence of color spots.

  According to invention of Claim 2, in addition to the structure of Claim 1, the lighting device which supplies the lighting power suitable for the 1st and 2nd solid state light emitting element, the 1st and 2nd solid state light emitting element, And the optical lens that adjusts the irradiation range of the radiated light transmitted through the light transmitting portion, so that the color tone of the irradiated light can be adjusted and It is possible to provide a spotlight that can suppress the decrease in the amount of irradiation light while reducing the occurrence. Furthermore, since the optical lens projects the radiated light that has passed through the translucent part, the optical lens zoom state with respect to the light that is transmitted from the optical lens through the translucent part. Therefore, the phenomenon that the region of the light transmitting part through which the irradiation light is transmitted does not change, and therefore, it is possible to prevent the trouble that the light diffusing characteristic of the light transmitting part cannot be exhibited depending on the zoom state.

(First embodiment)

  FIG. 1 is a schematic configuration diagram of a solid state light emitting illumination device 11 according to a first embodiment of the present invention. A plurality of LEDs 13 are attached as solid-state light emitting elements to the LED array unit 12, and in addition to white LEDs 13a for main beams that emit specific light colors, complementary color LEDs 13b1 and 13b2 having light colors different from white are attached. ing. Here, the LED 13 can be a cannonball type or a high output type power LED having a relatively large light output. Further, as the complementary color LED, for example, a red type, a green type, a blue type, etc. Colored LEDs can be used alone or in appropriate combination.

  The plurality of LEDs 13 of the LED array unit 12 are arranged to emit a beam toward the center of the aperture 16 so that the emitted light is mixed in a region where the aperture 16 is located.

  The aperture unit 15 blocks the turbulent light outside the area of the aperture 16 out of the radiated light of the plurality of LEDs 13 attached to the LED array unit 12, and, for example, a condensing lens 17 for a spotlight through the aperture 16. The radiated light of the LED 13 is allowed to pass toward

  Thus, since the aperture portion 15 is provided so that the aperture 16 is positioned at a predetermined position where the light beams of the plurality of LEDs 13 attached to the LED array portion 12 are condensed, the aperture 16 is a pseudo light source. Can be considered.

  Further, a diffusing plate 18 is provided as a translucent portion between the aperture 16 of the aperture portion 15 and the condenser lens 17.

  The diffusion plate 18 is formed of a material such as resin, and the central region of one surface is processed to be uneven and processed so that the surface becomes smoother toward the outer edge.

  Therefore, in the outer contour region, the light is totally transmitted without being diffused, while the central portion has a predetermined light diffusion angle.

  This light diffusion angle is expressed by equation (1) where θ1 is the irradiation angle of the LED 13 and θ2 is the diffusion angle of the diffusion plate 14.

^{α = (θ1 2 -θ2 2)} 1/2 ... (1)

  For example, when the irradiation angle θ1 of the LED 13a is θ1 = 10 ° and the diffusion angle θ2 of the diffusion plate 18 is θ2 = 10 °, the diffusion plate emission angle α is α = 14.1 °.

  Therefore, it is preferable that the diffusion angle in the central region of the diffusing plate 18 is in a range where the diffused light reaching the condenser lens 17 falls within the diameter of the condenser lens 17.

  According to the solid state lighting device as described above, the diffusion plate 18 is configured so that the central region has a light diffusion characteristic and does not diffuse in the outer contour region in the direction intersecting the optical path of the emitted light of the LED. Therefore, there is no light diffusion at the contour portion of the radiated light, and as a result, it is possible to prevent a decrease in the amount of light at the portion corresponding to the contour portion. Further, since the light in the central region is diffused by the diffusing plate 18 which is a translucent portion, it is possible to improve color spots of each color emitted from the LED 13. Therefore, the color spot at the center of the light, which is a practical problem with spotlights frequently used in the stage or studio, is effectively eliminated.

(Second Embodiment)

  FIG. 2 is a schematic configuration diagram of the spotlight according to the embodiment of the present invention, and FIG. 3 is a schematic front view thereof.

  The spotlight main body 19 is formed of, for example, a metal box, and houses the solid light emitting illumination device 11 shown in FIG.

  The condensing lens 17 is disposed in the spotlight main body 19 apart from the solid light emitting illumination device 11 and condenses the emitted light emitted from the solid light emitting illumination device 11. The condensing lens 17 can be composed of a spherical lens or a flat lens. In this embodiment, the case where one Fresnel lens is used is shown.

  Further, a known moving mechanism 20 is provided so that the distance between the condenser lens 17 and the solid-state light-emitting illumination device 11 can be made relatively variable. The moving mechanism 20 includes a light source focus handle 20a and a lens focus handle 20b, and the moving mechanism 20 relatively varies the separation distance between the LED array unit 12 and the condensing lens 17 to thereby change the distance on the irradiated surface. The light irradiation area is changed, and the amount of light is changed.

  Further, the spotlight body 19 on the condenser lens 17 side is provided with a bander 21, and by adjusting the opening / closing angle of the bander 21, the irradiation range of light from the spotlight is blocked and adjusted as desired.

  A lighting device (not shown) that supplies lighting power suitable for the LED 13 is housed in a lighting device housing portion 19 a located below the spotlight body 19. This lighting device converts the commercial power supplied to a low wattage DC suitable for the LED, and in response to a dimming signal such as a DMX signal output from the outside, the white LED 13a of the main beam and the complementary color LED 13b1, The lighting power for 13b2 can be adjusted independently.

  According to the spotlight as described above, the diffuser plate 18 has a light diffusion characteristic in the direction intersecting the optical path of the emitted light of the LED as in the above embodiment, and does not diffuse in the outer contour region. Therefore, there is no light diffusion at the contour portion of the radiated light, and as a result, it is possible to prevent a decrease in the light amount of the portion corresponding to the contour portion. Further, since the light in the central region is diffused by the diffusing plate 18 which is a translucent portion, it is possible to improve color spots of each color emitted from the LED 13. Furthermore, since the diffused light is focused by the moving mechanism 20, the phenomenon that the region of the light transmitting portion through which the irradiated light is transmitted does not change depending on the zoom state of the optical lens. Depending on the state, the light diffusing property of the translucent part is not exhibited, and the illuminated surface can be illuminated as desired.

  In the embodiment described above, as the diffusion plate constituting the translucent part, the central region of one surface is processed to be uneven, and the surface is processed so as to become smooth toward the outer edge, in other words In this case, the light diffusing property is described as decreasing from the center toward the outer ring in the direction orthogonal to the optical path. However, the present invention is not limited to this, and the light diffusing property may be varied.

  In other words, if the light diffusibility increases in the direction intersecting the optical path from the center toward the outer ring, the amount of light in the central area of the irradiated surface can be increased relatively, It can be expected to reduce the occurrence of color spots.

The schematic block diagram of embodiment which concerns on the solid light emission type illuminating device of this invention. The schematic block diagram of embodiment which concerns on the spotlight of this invention. The schematic front view of the spotlight shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Solid light-emitting illuminating device, 12 ... LED arrangement | sequence part, 13 ... Complementary color LED,
14 ... Translucent part (diffuser plate), 15 ... Aperture part, 16 ... Aperture, 17 ... Condensing lens,
18 ... Diffuser, 19 ... Spotlight body, 20 ... Moving mechanism, 21 ... Banda

Claims (2)

A first solid state light emitting device having directivity and configured to emit light of a specific light color;
A second solid state light emitting device having directivity and configured to emit light of a light color different from that of the first solid state light emitting device;
An instrument body containing the first and second solid state light emitting elements so as to mix and project the emitted light from the first and second solid state light emitting elements in a predetermined direction;
A translucent part located in the optical path of the mixed radiant light and configured to have different light diffusion characteristics in the direction intersecting the optical path;
A solid-state light-emitting illuminating device comprising: A first solid state light emitting device having directivity and configured to emit light of a specific light color;
A second solid state light emitting device having directivity and configured to emit light of a light color different from that of the first solid state light emitting device;
An instrument body containing the first and second solid state light emitting elements so as to mix and project the emitted light from the first and second solid state light emitting elements in a predetermined direction;
A translucent part located in the optical path of the mixed radiant light and configured to have different light diffusion characteristics in the direction intersecting the optical path;
An optical lens configured to relatively change a separation distance between the first and second solid state light emitting devices and adjusting an irradiation range of the radiated light transmitted through the light transmitting portion;
A lighting device for supplying lighting power suitable for the first and second solid state light emitting devices;
Spotlight characterized by having.

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