JP2004063175A - Lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting device which can efficiently control a light distribution in a near-horizontal direction with a size comparable with a conventional apparatus and a light source of a comparable wattage, and satisfy a safety illumination level for security. <P>SOLUTION: The lighting device is equipped with a light source 1 provided in a longitudinal direction, a side view reflecting mirror 3 having a convex part 2 towards the light source 1, and an upper part reflecting mirror 4 arranged on an upper part of the light source 1 and distributing light in a near-horizontal direction. The convex part 2 of the side view reflecting mirror 3 is positioned on a central axis 5 in the longitudinal direction of the light source 1. The side view reflecting mirror 3 is either of a curved shape or a flat plate. Since light is cast in the distance by arranging the side view reflecting mirror 3 having the convex part 2 towards the light source 1 at a side surface of the light source 1, an outdoor security light satisfying a safety illumination level for security can be provided. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a lighting device applied to a security lighting device or the like that can realize high illuminance in horizontal illuminance and vertical illuminance.
[0002]
[Prior art]
As shown in FIG. 8, in a security lighting device, it is desirable that the behavior and posture of a pedestrian at a distance of 4 m be understood as a lighting effect on security. The illuminance is preferably 3 (lx) or more, and the minimum vertical illuminance at a height of 1.5 m is preferably 0.5 (lx) or more.
[0003]
In addition, security lighting fixtures are often attached to existing telephone poles 104 to reduce costs. The interval between the electric poles 104 is about 40 m, and the vertical illuminance immediately below the appliance is determined by the luminous intensity of the appliance 40 m adjacent without being affected by the appliance.
[0004]
When the installation interval is 40 m and the installation height is 4.5 m, the luminous intensity that affects the vertical illuminance at 1.5 m immediately below the adjacent appliance is substantially horizontal light θ = 85 ° from immediately below the appliance, Since the illuminance attenuates in inverse proportion to the square of the distance, it is difficult to satisfy the above illuminance criterion when instruments are installed at intervals of 40 m.
[0005]
[Problems to be solved by the invention]
As shown in FIG. 9A, a lighting device that generally implements a batwing light distribution in a road light or a security light conventionally uses a reflecting mirror (cross light distribution) 101 that is concave toward the lamp 100. It is. With a light source of W (wattage) usually used as a security light, it is difficult to achieve a target value only with the direct light L alone. To compensate for this, a reflecting mirror 102 is used as shown in FIG. 9 (b). However, in order to control the light distribution in a substantially horizontal direction, in the conventional reflecting mirror shape, only the reflected light La is used and the direct light L is used. Can not be done. In addition, in the case of the shape of the conventional reflecting mirror, only a part of the light beam emitted from the lamp 100 can be used, and in particular, the light beam to the upper part of the lamp 100 cannot be used, which is very inefficient.
[0006]
Further, as shown in FIG. 9C, in order to use both the direct light L and the reflected light La, 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 reflecting mirror, but it is desirable to use a light source with the lowest possible W number in consideration of energy saving.
[0008]
Therefore, an object of the present invention is to be able to efficiently control the 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 appliance, and satisfy a safe and secure illuminance level. It is to provide a lighting device capable of.
[0009]
[Means for Solving the Problems]
The illumination device according to claim 1, wherein the light source has a longitudinal direction, a side reflector having a convex portion facing the light source, and is disposed at least one of an upper portion and a lower portion of the light source to distribute light in a substantially horizontal direction. In a lighting device including a light distribution control member, a convex portion of the side reflector is located on a central axis in a longitudinal direction of the light source.
[0010]
According to the lighting device of the first aspect, by arranging the side reflector having the convex portion toward the light source on the side surface of the light source and causing the light to fly far, the same size and the same size as those of the conventional fixture are achieved. Light distribution control can be efficiently performed in a substantially horizontal direction with a light source of W number, thereby providing a security light that achieves a target value and satisfies a safe and secure illuminance level.
[0011]
According to a second aspect of the present invention, in the lighting device according to the first aspect, the side reflecting mirror has a curved shape.
[0012]
According to the lighting device of the second aspect, the same effect as that of the first aspect is obtained.
[0013]
According to a third aspect of the present invention, in the lighting device according to the first aspect, the side reflecting mirror is a flat plate.
[0014]
According to the lighting device of the third aspect, the same effect as that of the first aspect is obtained.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
A first embodiment of the present invention will be described with reference to FIGS. That is, this lighting 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-shaped lamp such as a straight tube fluorescent lamp, a twin lamp, and a cerameter lamp is used, and the longitudinal direction is substantially horizontal in the drawing.
[0017]
The side reflector 3 has the convex portion 2 located on the central axis 5 in the longitudinal direction of the light source 1, and is disposed at one end of the light source 1 in the embodiment. The overall shape is a butterfly wing shape, and the center bending line is a streak convex portion 2 extending vertically downward, and each wing portion 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 flux along a vertical plane including the central axis 5 of the light source 1 is reflected in a substantially horizontal direction, that is, the light distribution control is performed in the above-mentioned θ = approximately 85 ° direction. .
[0018]
The light distribution control member 4 distributes light in a substantially horizontal direction, that is, in the above-mentioned θ = approximately 85 ° direction. In the embodiment, an upper reflecting mirror located above the light source 1 is used. The upper reflecting mirror bends the center of the flat plate into a substantially rectangular shape along the bending line 4 a, the convex side thereof faces the light source 1, and makes the bending line 4 a parallel to the central axis 5 of the light source 1.
[0019]
FIG. 2A illustrates the light distribution by the lighting device N. In the light distribution control of the section of φ = 0 °, the luminous intensity value in a substantially horizontal direction, for example, the direction of θ = 85 ° is increased, and φ = about 45 °. Light distribution control of ~ 90 ° cross section increases the luminous intensity value in the θ = 85 ° direction near φ = 0 °, and light distribution control of φ = 90 ° cross section aims to cut glare light to the sidewalk facing surface. I do.
[0020]
FIG. 2B shows a recommended illuminance value in which a light flux of 200 cd / 10001 m or more is emitted in the direction of θ = 85 ° in the section A direction perpendicular to the central axis 5 of the light source 1 shown in FIG. Is satisfied. 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 flux near the section B direction parallel to the central axis 5 of the light source 1 is controlled in the section A direction θ = 85 ° direction using the reflecting mirror 3.
[0021]
According to the above-described embodiment, by attaching the side reflector 3 having a convex portion on the side surface and causing the light to travel far, the light source having the same size and the same W number as the conventional device can be efficiently used in the substantially horizontal direction. It is possible to provide a security light that achieves a target value and satisfies a safe and secure 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 a reflection plate, 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 surface reflecting mirror 3 having the convex portion 2 is a plane reflecting mirror. As shown in FIG. 3B, the light distribution is controlled in the direction of θ = 85 ° by using a planar shape for the convex side reflector 3. The plane reflecting mirror is disposed so as to be approximately 45 ° with respect to a plane P formed by the central axis 5 of the light source 1 and the projection 2 of the side reflecting mirror 3.
[0024]
A third embodiment of the present invention will be described with reference to FIG. That is, in the first embodiment, the light distribution control member 4 is a lower reflecting mirror disposed below the light source 1 instead of the upper reflecting mirror. The lower reflecting mirror is a bent-shaped plate slightly smaller than the upper reflecting mirror, and has a convex surface directed toward the light source 1 and a bent line 4 a along the central axis 5 of the light source 1.
[0025]
4A shows a case where the side reflector 3 is a curved surface, and FIG. 4B shows a case where the side reflector 3 is a flat surface. 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, in addition to the side reflector 3 for controlling the light distribution in the direction in which θ is approximately 85 ° and the upper reflector 4b as the light distribution control member 4, a lower reflector similar to that of the third embodiment 4c. 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 reflector 3a facing the side reflector 3 is provided on the opposite side of the light source 1 in the longitudinal direction. However, this side reflector is a plane mirror. The efficiency is higher than in 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. The efficiency is higher than in the fourth embodiment.
[0029]
【The invention's effect】
According to the lighting device of the first aspect, by arranging the side reflector having the convex portion toward the light source on the side surface of the light source and causing the light to fly far, the same size and the same size as those of the conventional fixture are achieved. Light distribution control in a substantially horizontal direction can be efficiently performed with a light source having a W number, whereby a security light that achieves a target value and satisfies a safe and secure illuminance level can be provided.
[0030]
According to the lighting device of the second aspect, the same effect as that of the first aspect is obtained.
[0031]
According to the lighting device of the third aspect, the same effect as that of the first aspect is obtained.
[Brief description of the drawings]
FIG. 1 is a perspective view schematically showing a first embodiment of the present invention.
FIG. 2 is an explanatory diagram illustrating light distribution of a lighting device.
FIG. 3 is a perspective view schematically showing a second embodiment.
FIG. 4 is a perspective view schematically showing a third embodiment.
FIG. 5 is a perspective view schematically showing a fourth embodiment.
FIG. 6 is a perspective view schematically showing a fifth embodiment.
FIG. 7 is a perspective view schematically showing a sixth embodiment.
FIG. 8 is an explanatory diagram illustrating 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 reflection mirror 4 Light distribution control member 5 Central axis

Claims (3)

A light source having a longitudinal direction, a side reflector having a convex portion facing the light source, and a light distribution control member disposed on at least one of an upper part and a lower part of the light source and distributing light in a substantially horizontal direction. The lighting device according to claim 1, wherein a convex portion of the side reflector is located on a central axis in a longitudinal direction of the light source. The lighting device according to claim 1, wherein the side reflector has a curved shape. The lighting device according to claim 1, wherein the side reflector is a flat plate.

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