JP2014075231A - Illumination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an illumination device with high safety in which an adverse effect on the eyes is reduced.SOLUTION: An illumination device 100 includes: an attaching part 10 for being attached to a support pillar such as an electric pole; a housing 20 fixed at the attaching part 10; and first transmission cover 31 and a second transmission cover 32 attached to the housing 20. In the housing 20, two rectangular substrates are arranged being separated from each other at a proper distance. In each substrate, white LEDs and blue LEDs are mounted so as to be in a row. The first transmission cover 31 transmits only light of the white LEDs. Also, the second transmission cover 32 transmits only light of the blue LEDs. The light diffusion rate of the first transmission cover 31 is smaller than the light diffusion rate of the second transmission cover 32.

Description

  The present invention relates to an illumination device including a white light source and an other color light source that emits light different from the white light source.

  In recent years, as LEDs (light-emitting diodes) have increased in brightness, LEDs having characteristics such as low power consumption and long life are being used as light sources for lighting devices in place of light sources such as fluorescent lamps. In addition, LEDs having various emission colors have been commercialized.

  For example, blue light illumination is said to be psychologically calm and is being used for crime prevention lights, railway lighting, road lights, and the like. For example, an illuminating device is disclosed that includes a plurality of monochromatic (for example, blue) LEDs, a white LED that is fewer than the monochromatic LEDs, and a translucent case that irradiates the light of each LED to the outside (Patent Document 1). reference).

JP 2012-9434 A

  In the lighting device of Patent Document 1, the number of blue LEDs is larger than the number of white LEDs, and the light of the blue LEDs and the white LEDs is similarly emitted from one translucent case to the outside. Recognize as light illumination. On the other hand, the possibility of injury to the eyes of blue light is standardized by IEC, JIS, etc., and for example, the exposure tolerance for the retina is defined. In addition, blue light has low visibility and it is difficult to feel glare, so the pupil may remain open even when the light-transmitting case of the lighting device is directly viewed, and the illuminance of blue light on the retina may increase. The lighting device of Patent Document 1 has a safety problem that it is easily affected by blue light.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a highly safe lighting device with reduced adverse effects on eyes.

  An illumination device according to the present invention includes a white light source that emits white light, another color light source that emits light different from the white light, and a transmission cover that transmits light from each light source, and the light from the white light source. The light diffusivity of the first transmissive cover that transmits light is smaller than the light diffusivity of the second transmissive cover that transmits light from the other color light source.

  The present invention includes a white light source that emits white light, another color light source that emits light different from white, and a transmission cover that transmits light from each light source. White light is light realized by a continuous spectrum over the entire range of visible light, and can include not only so-called white, but also colors such as daylight color, daylight white, warm white, and light bulb color. The other color light source is, for example, a light source that emits blue light. The light diffusivity of the first transmissive cover that transmits light from the white light source is smaller than the light diffusivity of the second transmissive cover that transmits light from other color light sources. By making the light diffusivity of the first transmissive cover relatively small, white light is transmitted through the transmissive cover without being relatively diffused. Therefore, the white light source is a light source with high luminance, and the transmissive cover is directly viewed. Since the pupil can be easily closed and the illumination can be difficult to see directly due to glare, the adverse effect on the eyes caused by blue light can be reduced and safety can be increased.

  The illumination device according to the present invention is characterized in that the other color light source is arranged so as to maximize the illuminance of the other color light source on the irradiation surface in the maximum luminance direction of the white light source.

  In the present invention, the other color light source is arranged to maximize the illuminance of the other color light source on the irradiation surface in the maximum luminance direction of the white light source. The other color light source is, for example, a light source that emits blue light. Since blue light has low spectral sensitivity of human eyes and low sensitivity of a camera or the like, the visibility of the irradiated surface and surroundings irradiated with blue light is poor. By maximizing the illuminance of the other color light source on the irradiation surface in the maximum luminance direction of the white light source, the illuminance can be higher than the illuminance of the irradiation surface by blue light alone, so visibility is improved by visual observation and camera etc. Can be made.

  The illumination device according to the present invention is characterized in that the white light source is a white LED, and the other color is blue.

  In the present invention, the white light source is a white LED, and the other color is blue. Thereby, the illumination as the whole illuminating device is blue light illumination, and the psychological effect of blue light can be maintained. In addition, since the blue light is diffused by the second transmission cover having a relatively large light diffusivity, for example, the ratio of the maximum radiance to the average radiance of the blue light can be suppressed, and when the transmissive cover is observed. The irradiance on the retina can be suppressed and the risk of injury can be reduced.

  The lighting device according to the present invention is characterized in that the first transmission cover is a transparent cover.

  In the present invention, the first transmission cover is a transparent cover. As a result, white light can be transmitted without being diffused, and a light source with high brightness by white light can be realized, the pupil can be easily closed, and illumination can be made difficult to see directly.

  The illumination device according to the present invention includes an optical member that diffuses light of the white light source so as to widen an irradiation area of the white light source in a predetermined direction.

  In this invention, the optical member which diffuses the light of a white light source is provided so that the irradiation area | region of a white light source may be expanded in a predetermined direction. For example, when the lighting device is installed on the side of a road as a road lamp, the predetermined direction is the traveling direction of the road (a direction substantially orthogonal to the width direction of the road). The optical member is a lens for diffusing the light of the white light source in a predetermined direction, or a first transmission cover having the lens function. Thereby, the blue light illumination which can illuminate a required area with high illuminance is realizable.

  According to the present invention, it is possible to increase the safety by reducing adverse effects on the eyes.

It is an external appearance perspective view which shows an example of a structure of the illuminating device of this Embodiment. It is a top view which shows an example of a structure of the transparent cover of the illuminating device of this Embodiment. It is a top view which shows an example of the principal part of the illuminating device of this Embodiment. It is a schematic diagram which shows an example of the installation state of the illuminating device of this Embodiment. It is a schematic diagram which shows the other example of the installation state of the illuminating device of this Embodiment.

  Hereinafter, the present invention will be described with reference to the drawings illustrating embodiments thereof. 1 is an external perspective view showing an example of the configuration of the illumination device 100 according to the present embodiment, and FIG. 2 is a plan view showing an example of the configuration of the transmission cover of the illumination device 100 according to the present embodiment. These are top views which show an example of the principal part of the illuminating device 100 of this Embodiment. FIG. 3 shows a state in which a transmission cover described later is removed. In the following description, a road light with blue light illumination is taken as an example of the illumination device 100, but the illumination device 100 of the present embodiment is not limited to a road light.

  The illuminating device 100 includes an attachment portion 10 for attachment to a pole such as a utility pole, a case 20 fixed to the attachment portion 10, a first transmission cover 31 and a second transmission cover 32 attached to the case 20. In FIG. 1 and FIG. 2, the first transmissive cover 31 and the second transmissive cover 32 have different light diffusivities for convenience. Therefore, the second transmissive cover 32 is given a pattern as an example.

  The casing 20 has a rectangular shape with an opening on one side, has a rectangular shape that can be composed of a long side and a short side in plan view, and the short side is curved in a convex shape (semicircular shape) toward the outside. It is. The housing 20 is not limited to a metal such as aluminum or iron, but may be made of other materials such as resin or ceramics.

  As shown in FIG. 3, two rectangular substrates 40 are arranged in the housing 20 so as to be separated by an appropriate length. The length of the substrate 40 can be made slightly shorter than the length of the housing 20. On each substrate 40, white LEDs 41 and blue LEDs 42 are mounted in a line. In the example of FIG. 3, the white LED 41 is provided on the side opposite to the mounting portion 10 of the housing 20, and the three blue LEDs 42 are provided on the mounting portion 10 side of the housing 20. In addition, arrangement | positioning, the number, etc. of white LED41 and blue LED42 are not limited to the example of FIG.

  The light emitted by the white LED 41 is light having a spectrum having continuous or plural peaks in the visible light range, and may include not only so-called white but also light colors such as daylight color, daylight white, warm white, and light bulb color. it can.

  As shown in FIGS. 2 and 3, the first transmissive cover 31 and the second transmissive cover 32 are attached to the opening of the housing 20 so as to be adjacent to each other.

  The translucent cover 32 is a milky white translucent cover made of a material that transmits light, such as polycarbonate resin or acrylic resin, in which a diffusing material that diffuses light is dispersed.

  The translucent cover 31 is made of a material that transmits light, such as polycarbonate resin or acrylic resin, and is a transparent cover that does not include a diffusing material. It is also possible to include a small amount of diffusing material that diffuses light.

  The first transmission cover 31 is disposed at a position facing the white LED 41, covers the white LED 41, and transmits only the light of the white LED 41. The second transmission cover 32 is disposed at a position facing the blue LED 42, covers the blue LED 42, and transmits only the light of the blue LED 42. The light diffusion rate of the first transmission cover 31 is smaller than the light diffusion rate of the second transmission cover 32. That is, by making the light diffusivity of the first transmission cover 31 relatively small or non-diffuse transmission, white light is transmitted through the transmission cover 31 without being relatively diffused. Light source (for example, a light source that can be substantially regarded as a point light source). When the transmission covers 31 and 32 are viewed directly, the pupil is easily closed and the illumination is difficult to view directly due to glare. Therefore, it is possible to increase the safety by reducing the adverse effect of the blue light on the eyes.

  The ratio of the number of the white LEDs 41 and the blue LEDs 42 is 1: 3, and the light of the blue LEDs 42 passes through the transmission cover 32 having a relatively high light diffusivity. For this reason, the blue light becomes so-called diffused light (the blue LED can be substantially regarded as a surface light source), and thus the light color of the entire illumination device 100 is blue (the blue color defined in JIS). Included in range). Thereby, the psychological effect of blue light can be maintained. The ratio of the number of the white LEDs 41 and the blue LEDs 42 is set to, for example, 1: 3, so that the ratio of the radiant flux of the white LEDs 41 to the blue LEDs 42 (the ratio of the amount of light or the ratio of the current flowing through the LED chip may be 4). Since it can be reduced to about a half, the illumination light of the entire illumination device 100 can be blue.

  Further, since the blue light is diffused by the second transmission cover 32 having a relatively large light diffusivity, for example, the ratio of the maximum radiance to the average radiance of the blue light can be suppressed. The irradiance on the retina when gazing can be suppressed, and the risk of injury can be reduced. That is, blue light has lower spectral luminous efficiency than white light, and therefore has lower luminance than white light having the same radiance (energy). For this reason, blue light is less likely to feel glare than white light, the pupil is likely to remain open, and dimming reduces the chance of diverting the eyes from the light source, which tends to increase the illuminance on the retina. This is because the risk for retinal injury is increased.

  Moreover, the 1st permeation | transmission cover 31 can also be used as a transparent cover, for example. Thereby, white light can be transmitted without being diffused, and a point light source with high brightness by white light can be realized, the pupil can be easily closed, and illumination can be made difficult to see directly. That is, by realizing a point light source of white light, the maximum radiance is increased, and the illuminance on the retina when the user gazes at the white light source increases.

  FIG. 4 is a schematic diagram illustrating an example of an installation state of the illumination device 100 according to the present embodiment. As shown in FIG. 4, the lighting device 100 is attached to a pole or utility pole on the side of the road so that the height from the road is a predetermined height. The mounting direction is such that the short side of the casing 20 of the lighting device 100 is in the direction of the road, and the long side of the casing 20 is in the direction of the road width.

  The blue LED 42 is arranged to maximize the illuminance of the blue LED 42 on the irradiation surface in the maximum luminance direction of the light from the white LED 41. Further, as shown in FIG. 4, when the lighting device 100 is attached to a support or the like in a predetermined attachment state, the white LED 41 and the substrate are previously set so that the maximum luminance direction of the white LED 41 is near the center in the width direction of the road. 40 is arranged.

  Since blue light has low spectral sensitivity of human eyes and low sensitivity of a camera or the like, the visibility of the irradiated surface and surroundings irradiated with blue light is poor. By maximizing the illuminance of the blue light source on the irradiation surface in the maximum luminance direction of the white light source, the illuminance can be increased more than the illuminance of the irradiation surface by the blue light alone, so that visibility is improved by visual observation and a camera, etc. be able to. Further, by matching the position where the illuminance of the blue LED 42 is highest with the maximum luminance direction of the white light source, the dazzle due to white light becomes strongest at the position where the adverse effect on the eyes due to blue light is most significant. Since the illumination device 100 can be made most difficult to view directly, the risk of retinal injury can be further reduced.

  FIG. 5 is a schematic diagram illustrating another example of the installation state of the illumination device 100 of the present embodiment. As in the case of FIG. 4, the lighting device 100 is attached to a pillar or a utility pole on the side of the road so that the height from the road becomes a predetermined height. The mounting direction is such that the short side of the casing 20 of the lighting device 100 is in the direction of the road, and the long side of the casing 20 is in the direction of the road width.

  In addition, when the lighting device 100 is attached to a support or the like in a predetermined attachment state, the white LED 41 and the substrate 40 are arranged in advance so that the maximum luminance direction of the white LED 41 is near the center in the width direction of the road.

  And the illuminating device 100 is equipped with the optical member which diffuses the light of white LED41 in order to widen the irradiation area | region (for example, area | region where illumination intensity becomes a predetermined value or more) of the white LED41 in a predetermined direction. For example, when the lighting device 100 is installed on the side of a road as a road lamp, the predetermined direction is a traveling direction of the road (a direction substantially orthogonal to the width direction of the road). The optical member is a lens for diffusing the light of the white LED 41 in a predetermined direction. Alternatively, the first transmission cover 31 can have the lens function. Thereby, the illuminance can be increased more than the blue light alone, and the blue light illumination that can illuminate a required area of the road with high illuminance can be realized.

  The configurations described in the above embodiments can be combined with each other, and new technical features can be formed by combining the configurations.

  In the above-described embodiment, the lighting device as a road light has been described. However, the lighting device is not limited to a road light, and may be another lighting device. Moreover, although the illuminating device provided with the LED module as the light source has been described, the light source is not limited to the LED module, and may be another light source such as an organic EL. Further, instead of the blue LED, a light source that is substantially a surface light source such as a fluorescent lamp capable of emitting blue light may be used.

  In the above-described embodiment, the blue light source is used as the other color light source. However, the illumination device as a whole is illumination light that is different from white light, but can be regarded as a point light source, and a surface. When combining light sources of other colors regarded as light sources, light sources of colors other than blue can be used as other colors.

20 Housing 31 First transmission cover 32 Second transmission cover 40 Substrate 41 White LED
42 Blue LED

Claims (5)

A white light source that emits white light;
Another color light source emitting light different from the white color,
A transmission cover that transmits light from each light source,
The light diffusivity of the 1st transmission cover which permeate | transmits the light from the said white light source is smaller than the light diffusivity of the 2nd transmission cover which permeate | transmits the light from the said other color light source, The illuminating device characterized by the above-mentioned.   The illumination device according to claim 1, wherein the other color light source is arranged to maximize the illuminance of the other color light source on an irradiation surface in the maximum luminance direction of the white light source. The white light source is a white LED,
The illumination device according to claim 1, wherein the other color is blue.   The lighting device according to any one of claims 1 to 3, wherein the first transmission cover is a transparent cover.   5. The illumination device according to claim 1, further comprising an optical member that diffuses light of the white light source so as to widen an irradiation region of the white light source in a predetermined direction.

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