JP2013008452A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device capable of suppressing uncomfortable and unpleasant feeling to a pedestrian.SOLUTION: The lighting device 10 is provided with a first irradiation part 20 which irradiates light having a relatively high S/P ratio toward a horizontal direction side, and a second irradiation means which irradiates light having a lower S/P ratio than the first irradiation part 20 and an identical color temperature toward the lower side in vertical direction than the first irradiation means. The lighting device 10 has also a third irradiation part 30 which irradiates light onto between the first irradiation part 20 and the second irradiation part 25 with the S/P ratio between the first irradiation part 20 and the second irradiation part 25 making the identical color temperature.

Description

  The present invention relates to a lighting device that can be used in a low vision environment.

  Lighting devices used for road and street lighting (hereinafter referred to as street lighting) need to ensure the visibility of passers-by and road vehicles drivers passing through the road and street. By the way, the human visual sensitivity is different between photopic vision, scotopic vision, and dimming vision. In photopic vision, color can be perceived by the action of cone cells, and in dark vision, the cone cells do not function and cannot perceive color. However, the sensitivity is improved by the action of rod cells. In addition, twilight vision is an intermediate state between photopic vision and scotopic vision, and both cone cells and rod cells function. Here, the peak wavelength of visibility in photopic vision is about 555 nm, whereas the peak wavelength of visibility in dark vision is shifted to about 507 nm. Such a phenomenon is well known as the Purkinje phenomenon.

  As an illumination device using the Purkinje phenomenon, there is an outdoor illumination device described in Patent Document 1. In this conventional example, white light is irradiated to the area below the lamp body in the vertical direction, and blue light is irradiated to the outside (horizontal direction) of the white light irradiation area. Thereby, since the visibility is improved by blue light, an effect of crime prevention can be expected, and further, an effect can be expected that smooth traffic of pedestrians and vehicles is not hindered by white light.

JP 2008-135381 A

  By the way, in said illuminating device, since two light colors differ greatly, it becomes a blue light irradiation area | region and a white light irradiation area | region, A pedestrian etc. tends to feel a color spot and there exists a possibility of giving discomfort. In addition, the outer blue irradiation region and the inner white light irradiation region have low illuminance on the outer blue irradiation region, which may cause discomfort to the pedestrian. Furthermore, it is difficult to distinguish colors under blue light, and when a crime occurs, there is a possibility that the color of clothes or vehicles may be misidentified.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an illumination device that can suppress discomfort and discomfort for pedestrians.

  In order to solve the above-described problems, the illumination device of the present invention has a first irradiation unit that irradiates light having a relatively high S / P ratio toward the horizontal direction, and an S / P ratio that is higher than that of the first irradiation unit. And a second irradiating unit that irradiates light having a low color temperature and a lower vertical direction than the first irradiating unit.

  Further, in the above configuration, the first irradiation unit and the second irradiation unit are irradiated with light having the same color temperature at the S / P ratio between the first irradiation unit and the second irradiation unit. It is preferable to provide three irradiation means.

  Further, in the above configuration, the third irradiation means includes a first light source having the same color temperature and the same S / P ratio as the light source constituting the first irradiation means, and the same color temperature and the same S as the light source constituting the second irradiation means. It is preferable to use a second light source with a / P ratio.

In the above configuration, it is preferable that the third irradiation means is configured by alternately arranging the first light source and the second light source.
In the above configuration, it is preferable that the third irradiating unit is configured such that the pair of the first light source and the second light source is arranged close to each other.

In the above configuration, it is preferable that the third irradiating means is arranged so that the optical axis of the first light source and the optical axis of the second light source intersect each other.
In the above configuration, the third irradiating means is preferably composed of one type of light source and a wavelength conversion member that converts light from the light source into two types of light having different S / P.

  ADVANTAGE OF THE INVENTION According to this invention, the illuminating device which can suppress discomfort and discomfort with respect to a pedestrian can be provided.

(A) is a top view for demonstrating schematic structure of an illuminating device, (b) is a front view for demonstrating schematic structure of an illumination main body. It is the spectrum characteristic view for demonstrating the 1st light source and 2nd light source which comprise an illumination main body. It is a front view for demonstrating schematic structure of the illumination main body in another example. It is a front view for demonstrating schematic structure of the illumination main body in another example. It is sectional drawing of the 3rd irradiation part in another example. It is sectional drawing of the 3rd irradiation part in another example. It is a front view for demonstrating schematic structure of the illumination main body in another example. It is explanatory drawing for demonstrating the light distribution of each LED element of the illumination main body in the same as the above.

Hereinafter, an embodiment in which the present invention is embodied in, for example, a street lamp will be described with reference to the drawings.
As shown in FIG. 1A, the illumination device 10 of the present embodiment includes a support column 11 and an illumination body 12 attached to the tip of the support column 11.

The support | pillar part 11 consists of columnar metal materials, and the base end part is embed | buried under the ground, for example.
The illumination main body 12 attached to the tip of the support column 11 is formed in a rectangular parallelepiped shape having an open bottom surface (lower side in FIG. 1A). Moreover, the illumination main body 12 is provided with the 1st-3rd irradiation parts 20, 25, and 30 which irradiate white light as shown in FIG.1 (b), and each of these irradiation parts 20,25,30 is a lighting circuit which is not shown in figure. It is controlled by.

  The first irradiating unit 20 includes a plurality of LED (Light Emitting Diode) elements 21 having a color temperature of about 8000 K that are disposed outside the illumination main body 12 and irradiate a range Ao closer to the horizontal direction. As shown in FIG. 2, the LED element 21 has a peak wavelength with the highest spectral intensity at a wavelength of about 500 nm. After the spectral intensity decreases at a longer wavelength, the wavelength gradually increases from about 530 nm to about 560 nm. The spectral intensity is increased.

  The second irradiating unit 25 includes a plurality of LED elements 26 having a color temperature of about 8000K that are disposed inside the illumination main body 12 and irradiate a range Ai closer to the lower side in the vertical direction. As shown in FIG. 2, the LED element 26 constituting the second irradiating unit 25 has a peak wavelength with the highest spectral intensity at a wavelength of about 440 nm, a wavelength longer than that, and after the spectral intensity decreases, Is configured such that the spectral intensity gradually increases from about 480 nm to about 550 nm.

  The third irradiation unit 30 includes a plurality of LED elements 31 that are arranged between the first irradiation unit 20 and the second irradiation unit 25 and irradiate the range Ab between the range Ao and the range Ai at a color temperature of about 8000K. Composed.

  Moreover, each LED element 21,26,31 which comprises the 1st-3rd irradiation parts 20,25,30 is comprised so that it may become substantially the same color temperature. The LED element 21 constituting the first irradiation unit 20 has a higher S / P ratio than the LED elements 26 and 31 constituting the second irradiation unit 25 and the third irradiation unit 30. The LED element 31 constituting the third irradiation unit 30 is set to have a higher S / P ratio than the LED element 26 constituting the second irradiation unit 25. The S / P ratio of each LED element 21, 26, 31 is set to 2.2 for the LED element 21, 2.0 for the LED element 31, and 1.8 for the LED element 26, for example. Incidentally, the S / P ratio refers to the scotopic luminance Ls calculated by integrating the spectral luminous efficiency V ′ (λ) in scotopic vision with the spectral characteristics of the lamp, and the spectral luminosity in photopic vision. It is a ratio with the photopic brightness Lp calculated by integrating the spectral characteristics of the lamp with the efficiency V (λ).

Next, an operation example (action) of the illumination device 10 having the above configuration will be described.
The illuminating device 10 is lit white when electric power is supplied from the lighting circuit to the LED elements 21, 26, 31 of the irradiation units 20, 25, 30. At this time, the LED elements 21, 26, 31 are lit at substantially the same color temperature, and the entire ranges Ao, Ai, Ab irradiated by the LED elements 21, 26, 31 are substantially the same light color. Each of the LED elements 21, 26, 31 to which power is supplied has a higher S / P ratio toward the outside, that is, the LED element 21, the LED element 31, and the LED element 26 are sequentially lighted with a higher S / P ratio.

Next, characteristic effects of the present embodiment will be described.
(1) In the illuminating device 10 of this embodiment, the 1st irradiation part 20 which irradiates the light whose S / P ratio is relatively high toward the horizontal direction, and S / P ratio is lower than this 1st irradiation part 20 And a second irradiating unit that irradiates light having the same color temperature to the lower side in the vertical direction than the first irradiating unit. In this way, by increasing the S / P ratio of the portion where the illuminance tends to be lower as the outer side of the irradiation surface of the lighting device 10 is increased, the outer low illuminance portion (first irradiating unit 20) feels brighter due to Purkinje's phenomenon. Anxiety can be suppressed. Moreover, the difference in brightness feeling between the first irradiating unit 20 that is a low illuminance part and the second irradiating part 25 that is a relatively high illuminance part is suppressed (the degree of uniformity is improved), and the pedestrian feels uncomfortable. Is suppressed.

  (2) Moreover, in the illuminating device 10 of this embodiment, the color temperature between the first irradiation unit 20 and the second irradiation unit 25 is the color temperature at the S / P ratio between the first irradiation unit 20 and the second irradiation unit 25. Are provided with a third irradiating unit 30 for irradiating the same light. Thereby, since the S / P ratio is changed in a plurality of stages, it is possible to further suppress the pedestrian from feeling uncomfortable and improve the visual environment.

  (3) Moreover, in the illuminating device 10 of this embodiment, the light irradiated from each irradiation part 20,25,30 is set to white color temperature. For this reason, it is suppressed that it is difficult to discriminate colors by irradiating blue light as in the conventional lighting device, and it is possible to suppress erroneous recognition of clothes and vehicle colors.

In addition, you may change embodiment of this invention as follows.
-In above-mentioned embodiment, although LED element 31 of the 3rd irradiation part 30 was comprised by the LED element different from the LED elements 21 and 26 of the 1st irradiation part 20 and the 2nd irradiation part 25, it is not restricted to this.

  For example, as shown in FIG. 3, the third irradiation unit 30 may be configured by alternately arranging the LED elements 21 of the first irradiation unit 20 and the LED elements 26 of the second irradiation unit 25. Good. By setting it as such a structure, since the three irradiation parts 20, 25, and 30 are comprised by two types of LED elements 21 and 26, it becomes possible to hold down manufacturing cost.

  Further, as shown in FIG. 4, a pair of LED elements identical to the LED elements 21 of the first irradiation unit 20 and the LED elements 26 of the second irradiation unit 25 are arranged close to each other to form the third irradiation unit 30. May be. By adopting such a configuration, when the third irradiating unit 30 is directly viewed, even if the two types of LED elements 21 and 26 are used, the pedestrian is easily recognized as monochromatic light, and the discomfort given to the pedestrian can be suppressed. it can.

  Moreover, as shown in FIG.7 and FIG.8, the LED element pair of the LED element 21 of the said 1st irradiation part 20 and the LED element 26 of the 2nd irradiation part 25 is mutually optical axis L1, L2 (FIG. 8). The third irradiation unit 30 may be configured so as to intersect with each other. Here, the optical axes L1, L2, and the like are provided on a lens disposed below the LED elements 21 and 26 (light irradiation direction) and unevenness provided on a translucent cover (not shown) provided on the lower surface of the illumination body 12. L2 may be adjusted.

  Further, as shown in FIG. 5, the third irradiation unit 30 includes an LED element 42 disposed on the upper surface 41 a of the mounting substrate 41 and quarter-spherical wavelength conversion members 43 and 44 covering the LED element 42. May be configured. The wavelength conversion members 43 and 44 are formed in a quarter spherical shape by a synthetic resin material having translucency, and different types of fluorescent materials are mixed in two quarter spherical regions. . Therefore, the wavelength of light emitted from the LED element 42 is changed to two types of S / P ratios by the wavelength conversion members 43 and 44. And in the intermediate part of the wavelength conversion members 43 and 44, intermediate | middle light is obtained by mixing two types of light. In addition, as such a structure, as shown in FIG. 6, the LED element 52 is mounted on the bottom surface of the truncated cone-shaped recess 51a provided at the center of the mounting substrate 51, and the wavelength conversion member 53, 54 may cover the opening surface of the recess 51a.

In the above embodiment, each of the irradiating units 20, 25, and 30 is configured by an LED element, but may be configured by other light sources such as a fluorescent lamp and an organic EL element.
-In above-mentioned embodiment, although the illuminating device 10 was actualized to the street light, you may materialize not only a street light but a crime prevention light and other outdoor lighting.

  DESCRIPTION OF SYMBOLS 10 ... Illuminating device, 20 ... 1st irradiation part (1st irradiation means), 21 ... LED element (1st light source) which comprises 1st irradiation part, 25 ... 2nd irradiation part (2nd irradiation means), 26 ... LED element (second light source) constituting the second irradiation part, 30... Third irradiation part (third irradiation means), 31, 42, 52... LED element constituting the third irradiation part, 43, 44, 53, 54 ... Wavelength conversion member, L1, L2 ... Optical axis.

Claims (7)

First irradiation means for irradiating light having a relatively high S / P ratio toward the horizontal direction;
An illuminating device comprising: a second irradiating unit configured to irradiate light having a lower S / P ratio and the same color temperature than the first irradiating unit toward a lower side in the vertical direction than the first irradiating unit. . The lighting device according to claim 1.
A third irradiating means for irradiating light having the same color temperature between the first irradiating means and the second irradiating means at an S / P ratio between the first irradiating means and the second irradiating means; A lighting device comprising: The lighting device according to claim 2,
The third irradiating means includes a first light source having the same color temperature and S / P ratio as the light source constituting the first irradiating means, and a same color temperature and same S / P ratio as the light source constituting the second irradiating means. An illumination device comprising a second light source. The lighting device according to claim 3.
The illumination device, wherein the third irradiating means is configured by alternately arranging the first light source and the second light source. The lighting device according to claim 3.
The illumination device characterized in that the third irradiating means is configured such that a pair of the first light source and the second light source is arranged close to each other. The lighting device according to claim 3.
The illumination device, wherein the third irradiating means is arranged so that an optical axis of the first light source and an optical axis of the second light source intersect. The lighting device according to claim 2,
The third irradiating means is composed of one type of light source and a wavelength conversion member that converts light from the light source into two types of light having different S / P.

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