JP4122882B2 - Lighting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lighting device applied to a crime prevention lighting apparatus that can realize high illuminance in horizontal plane illuminance and vertical plane illuminance.
[0002]
[Prior art]
As shown in FIG. 8, in the crime prevention lighting apparatus, it is desirable to know the behavior / posture of a pedestrian 4 meters ahead as a lighting effect on crime prevention. As an illuminance standard for satisfying this, the horizontal plane average on the road surface 105 It is desirable that the illuminance is 3 (lx) or more, and the minimum illuminance on the vertical plane at a height of 1.5 m is 0.5 (lx) or more.
[0003]
In addition, security lighting fixtures are often attached to the existing utility pole 104 in order to reduce costs. The interval between the utility poles 104 is approximately 40 m, and the vertical illuminance directly below the appliance is not affected by the appliance, and is determined by the luminous intensity of the appliance adjacent to 40 m.
[0004]
If the installation interval is 40m and the installation height is 4.5m, the light intensity affecting the vertical surface illuminance at the 1.5m point directly below the adjacent instrument is light in the horizontal direction of θ = 85 ° from directly below the instrument. Since the illuminance attenuates in inverse proportion to the square of the distance, it is difficult to satisfy the above illuminance standard when installing instruments at intervals of 40 meters.
[0005]
[Problems to be solved by the invention]
As shown in FIG. 9A, an illumination device that generally realizes a batwing light distribution in a road light or a crime prevention light conventionally uses a concave reflecting mirror (cross light distribution) 101 toward the lamp 100. It is. With a light source of W (watt) number that is usually used as a security light, it is difficult to achieve the target value with the direct light L alone. In order to compensate for this, the reflecting mirror 102 is used as shown in FIG. 9B. However, in order to control light distribution in a substantially horizontal direction, the conventional reflecting mirror shape has only the reflected light La, and the direct light L is used. Can not be. Further, the shape of the conventional reflecting mirror can use only a part of the light beam emitted from the lamp 100, and in particular, the light beam to the upper part of the lamp 100 cannot be used.
[0006]
Further, in order to use both the direct light L and the reflected light La as shown in FIG. 9C, an instrument having a long distance between the lamp 100 and the reflecting mirrors 101 and 102 is required.
[0007]
If a high-output light source is used, the target can be achieved with a conventional reflector. However, it is desirable to use a light source with a low W number as much as possible in consideration of energy saving.
[0008]
Accordingly, the object of the present invention is to be able to efficiently control light distribution in a substantially horizontal direction with a light source having the same size and the same W number as that of a conventional instrument, and satisfying a safe illuminance level for crime prevention. It is providing the illuminating device which can be performed.
[0009]
[Means for Solving the Problems]
The illumination device according to claim 1 , wherein a light source having a substantially horizontal posture in a longitudinal direction and a protruding portion of a streak that is a butterfly wing and forms a vertical bending line at the center of the light source have a central axis in the longitudinal direction of the light source. In an illuminating device comprising: a side-surface reflecting mirror that is positioned on an extension and facing the light source; and a light distribution control member that is disposed on at least one of an upper part and a lower part of the light source and distributes light in a substantially horizontal direction. The side reflecting mirror is a polyhedron combining a small paraboloid focusing on each point on the central axis of the light source .
[0010]
According to the illuminating device of the first aspect, the side reflector having the convex portion toward the light source is arranged on the side surface of the light source and the light is blown away, so that the size is about the same as that of the conventional instrument. Light distribution control can be efficiently performed in a substantially horizontal direction with a W number of light sources, thereby achieving a target value and providing a crime prevention light that satisfies a safe illuminance level for crime prevention.
[0011]
According to a second aspect of the present invention, in the lighting device according to the first aspect, the light distribution control member is disposed above and below the light source, and the lower light distribution control member is slightly smaller than the upper light distribution control member. Is.
[0012]
According to the lighting device of the second aspect, the efficiency is further improved than that of the first aspect.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the present invention will be described with reference to FIGS. That is, the illumination device includes a light source 1 having a longitudinal direction, a side reflecting mirror 3 having a convex portion 2 toward the light source 1, and a light distribution control member 4.
[0016]
The light source 1 has a longitudinal direction. For example, a cylindrical or rod-like lamp such as a straight tube fluorescent lamp, a twin lamp, or a ceramic lamp is used, and the longitudinal direction is substantially horizontal in the drawing.
[0017]
The side reflecting mirror 3 has a convex portion 2 located on a central axis 5 in the longitudinal direction of the light source 1, and is arranged at one end of the light source 1 in the embodiment. The overall shape is a butterfly wing shape, and the central bent line is a straight protrusion 2 extending vertically downward, and each wing has a concave curved surface toward the light source 1. The shape of the curved surface is a paraboloid focusing on the center of the light source 1 or a point on the central axis of the light source 1, or a polyhedron combining small paraboloids focusing on each point. By using a curved surface shape for the convex side reflector 3, the light beam along the vertical plane including the central axis 5 of the light source 1 is reflected in the substantially horizontal direction, that is, the light distribution is controlled in the above-described θ = approximately 85 ° direction. .
[0018]
The light distribution control member 4 distributes light in a substantially horizontal direction, that is, in the above-described θ = approximately 85 ° direction. In the embodiment, an upper reflecting mirror located on the upper side of the light source 1 is used. The upper reflecting mirror is bent at the center of the flat plate into a substantially U shape along the bending line 4 a, the convex side thereof is directed to the light source 1, and the bending line 4 a is parallel to the central axis 5 of the light source 1.
[0019]
FIG. 2A illustrates the light distribution by the illumination device N. The light distribution control of the φ = 0 ° cross section increases the luminous intensity value in the substantially horizontal direction, for example, θ = 85 °, and φ = approximately 45 °. The light distribution control of the ~ 90 ° cross section increases the luminous intensity value in the direction of θ = 85 ° around φ = 0 °, and the light distribution control of the φ = 90 ° cross section aims to cut glare light on the sidewalk. To do.
[0020]
FIG. 2B shows a recommended illuminance value by blowing a light flux of 200 cd / 1000 lm or more in the θ = 85 ° direction in the section A direction perpendicular to the central axis 5 of the light source 1 shown in FIG. Indicates that In this case, if the illuminance value of the direct light L is 100 cd / 1000 lm, 100 cd of light Lb other than the direct light is required. As shown in FIG. 2C, the light distribution near the cross-section B direction parallel to the central axis 5 of the light source 1 is controlled using the reflecting mirror 3 in the cross-section A direction θ = 85 ° direction.
[0021]
According to the above-described embodiment, the side reflector 3 having the convex portion on the side surface is attached and the light is blown far away, so that the light source having the same size and the same W number as that of the conventional instrument can be efficiently horizontal. Therefore, it is possible to provide a crime prevention light that achieves a target value and satisfies a safe illuminance level.
[0022]
The upper reflecting mirror is not limited to a flat surface but may be a curved surface. In addition, the light distribution control member 4 is not limited to the reflector, and light distribution control can be performed by using optical components such as a prism and a louver.
[0023]
A second embodiment of the present invention will be described with reference to FIG. That is, in the first embodiment, the side reflecting mirror 3 having the convex portion 2 is a planar reflecting mirror. As shown in FIG. 3B, the light distribution is controlled in the θ = 85 ° direction by using a planar shape for the convex side reflector 3. The plane reflecting mirror is arranged so as to be approximately 45 ° with respect to the plane P composed of the central axis 5 of the light source 1 and the convex portion 2 of the side reflecting mirror 3.
[0024]
A third embodiment of the present invention will be described with reference to FIG. In other words, in the first embodiment, the light distribution control member 4 is a lower reflecting mirror disposed below the light source 1 in place of the upper reflecting mirror. The lower reflecting mirror is a slightly smaller U-shaped bent plate than the upper reflecting mirror. The convex side of the lower reflecting mirror faces the light source 1 and the bent line 4 a extends along the central axis 5 of the light source 1.
[0025]
4A shows the case where the side reflector 3 is a curved surface, and FIG. 4B shows the case where the side reflector 3 is a plane. There is an effect similar to that of the first embodiment.
[0026]
A fourth embodiment of the present invention will be described with reference to FIG. In the first embodiment, the side reflector 3 that controls the light distribution in the direction of θ of approximately 85 °, and the lower reflector similar to the third embodiment in addition to the upper reflector 4b as the light distribution control member 4 4c is combined. Therefore, the efficiency is improved as compared with the first embodiment.
[0027]
A fifth embodiment of the present invention will be described with reference to FIG. In the fourth embodiment, a side reflecting mirror 3 a facing the side reflecting mirror 3 is provided on the opposite side of the light source 1 in the longitudinal direction. However, this side reflector is a plane mirror. Efficiency is improved as compared with the fourth embodiment.
[0028]
A sixth embodiment of the present invention will be described with reference to FIG. In the fifth embodiment, the side reflecting mirror 3 is a plane mirror. Efficiency is improved as compared with the fourth embodiment.
[0029]
【The invention's effect】
According to the illuminating device of the first aspect, the side reflector having the convex portion toward the light source is arranged on the side surface of the light source and the light is blown far away. Light distribution control can be efficiently performed in a substantially horizontal direction with a W number of light sources, thereby achieving a target value and providing a crime prevention light that satisfies a safe illuminance level for crime prevention.
[0030]
According to the lighting device of the second aspect, the efficiency is further improved than that of the first aspect.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an outline of a first embodiment of the present invention.
FIG. 2 is an explanatory diagram illustrating light distribution of the lighting device.
FIG. 3 is a perspective view showing an outline of a second embodiment.
FIG. 4 is a perspective view showing an outline of a third embodiment.
FIG. 5 is a perspective view showing an outline of a fourth embodiment.
FIG. 6 is a perspective view showing an outline of a fifth embodiment.
FIG. 7 is a perspective view showing an outline of a sixth embodiment.
FIG. 8 is an explanatory diagram for explaining illuminance on a vertical plane and a horizontal plane.
FIG. 9 is a schematic cross-sectional view illustrating direct light and reflected light of a conventional lighting device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Light source 2 Convex part 3 Side reflector 4 Light distribution control member 5 Center axis

Claims (2)

A light source having a substantially horizontal posture in the longitudinal direction and a convex portion of a streak that forms a butterfly wing and forms a vertical bending line at the center thereof are located on the extension of the central axis in the longitudinal direction of the light source and face the light source. and have sides reflector, the illumination apparatus comprising a light distribution control member for light distribution substantially horizontally top and bottom are arranged in at least one with the light source, the side reflector to the central axis of the light source A lighting device characterized by being a polyhedron combining a small paraboloid focusing on each of the above points . The lighting device according to claim 1, wherein the light distribution control member is disposed above and below the light source, and the light distribution control member at the lower part is slightly smaller than the light distribution control member at the upper part .

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