JP3855699B2 - lighting equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lighting fixture having a light guide that can be applied to a railing lighting fixture or the like.
[0002]
[Prior art]
Conventionally, as shown in FIG. 5 (a), the opening angle of the light emitting portion 35 of the standard light guide 30 is a reflector in consideration of the light distribution as the base light illumination and the uniformity of the emitted light quantity in the longitudinal direction. The opening angle of 31 is set to approximately 120 °. 32 is the light distribution.
[0003]
When this standard light guide has a narrow-angle light distribution, the aperture angle is controlled by changing the size of the opening angle of the reflector 31 of the light emitting portion 35 to reduce the narrow-angle light distribution as shown in FIG. Can be realized. Reference numeral 33 denotes a narrow-angle light distribution in this case.
[0004]
This narrow-angle light distribution light guide is effective for illuminating directly under a space where the illuminance is directly underneath, such as corridor lighting, road lighting such as plant factories, railing lighting, wall washer lighting for museums, museums, etc. It is effective for.
[0005]
[Problems to be solved by the invention]
However, this narrow-angle light distribution is very inefficient because the aperture area is small. For this reason, when it is desired to increase the amount of emitted light with the narrow-angle light distribution light guide, or when it is desired to ensure the brightness of the road surface with the balustrade illumination, it becomes difficult to apply to applications such as tunnel lighting, road sign lights, and sign lighting.
[0006]
Accordingly, an object of the present invention is to provide a luminaire that can efficiently perform narrow-angle light distribution and increase the amount of emitted light.
[0007]
[Means for Solving the Problems]
The lighting fixture according to claim 1, comprising: a cylindrical light guide having a light emitting portion; and a light distribution angle control member provided in the light emitting portion along a central axis direction of the light guide, and the light distribution. The angle control member is erected toward the outside of the light guide at both side positions of the light emitting portion opposed to the circumferential direction of the light guide and inclined so that the tip approaches the central portion of the light emitting portion. It is a plate-like reflecting member that reflects light emitted from the light emitting portion.
[0008]
According to the lighting apparatus of the first aspect, the light distribution angle control member controls the light direction emitted from the light emitting portion of the light guide to be a narrow angle, so that the narrow angle light distribution is performed without reducing the efficiency. realizable.
[0009]
According to a second aspect of the present invention, in the lighting device according to the first aspect, the opening angle of the light emitting portion of the light guide is approximately 120 degrees to approximately 180 degrees.
[0010]
According to the lighting apparatus of the second aspect, in addition to the same effect as that of the first aspect, since the opening area can be increased, the amount of emitted light can be increased and the efficiency can be increased.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the present invention will be described with reference to FIG. That is, in this luminaire, the light distribution angle control member 3 is provided in the light emitting portion 2 of the cylindrical light guide 1 along the central axis direction of the light guide 1.
[0012]
In the light guide 1, a reflector 1b is disposed in a cylindrical tube 1a, and an opening having an opening angle α of approximately 120 ° is formed in the reflector 1b as a light emitting portion 2. The light incident from the end of the light guide 1 is reflected in the tube 1a and guided in the axial direction, and is emitted to the outside from the light emitting portion 2 serving as the opening of the reflector 1b. This configuration is the same as that of the conventional standard light guide.
[0013]
The light distribution angle control member 3 is a member that changes the direction of light. In the embodiment, a mirror-like reflection member is used, and is provided on both sides of the light emitting portion 2 on the outer surface of the tube 1a. The installation angle β with the vertical axis T of the reflection member when the reflection member is installed on the light guide 1 is set to be substantially the same as the narrow angle for which light distribution control is desired as shown in FIG. For example, when the beam angle is controlled to 20 degrees, β is set to about 20 degrees. L is a light beam.
[0014]
According to this embodiment, the light distribution angle control member 3 controls the light emission part 2 of the light guide 1 so that the direction of light emitted from the light emission part 2 is a narrow angle. . Further, uniform light emission is possible within a standard length of 20 m.
[0015]
A part or the whole of the reflecting member may be provided inside the light guide.
[0016]
A second embodiment of the present invention will be described with reference to FIG. That is, in this lighting apparatus, in the first embodiment, the light distribution control member 3 includes a reflection member in a louver shape and is installed on the inner surface of the light guide 1. The installation angle with the vertical axis of the louver piece constituting the louver of the reflecting member in this case is the same as that of the first embodiment.
[0017]
A third embodiment of the present invention will be described with reference to FIG. That is, this lighting fixture is provided with a sheet-like louver on the inner surface or outer surface of the light emitting portion 2 of the light guide 1 as the light distribution control member 3 in the first embodiment. This louver sheet is a film sheet 5 having a thickness of about 1 mm, in which a small number of highly reflective materials 6 are inclined at predetermined intervals so as to form a louver shape. Therefore, narrow-angle light distribution can be realized by the inclination of the reflector 6.
[0018]
A fourth embodiment of the present invention will be described with reference to FIG. That is, this lighting fixture has a microprism sheet installed on the inner surface or outer surface of the light emitting portion 2 of the light guide 1 as the light distribution control member 3 in the first embodiment. The microprism sheet is a flexible sheet whose surface is formed in a triangular shape as shown in FIG. As shown in FIG. 4D, the prism sheet is installed on the inner surface or outer surface of the light emitting portion 2 of the light guide 1 so that the prism direction is substantially perpendicular to the optical axis. Although it is desirable that the surface with the prism be installed outwardly on the light guide 1, it is also effective if it is installed inward.
[0019]
As another embodiment, for example, the opening angle of the reflector 1b of the light guide 1 of each of the above embodiments can be increased to increase the opening area of the light emitting portion 2. The lower limit of the range is approximately 120 degrees in order to make the opening area larger than that of the standard light guide, and the upper limit is approximately 180 degrees for the light guide 1 of the embodiment to control the bottom emission. Thereby, it is possible to further increase the emitted light flux while realizing narrow-angle light distribution.
[0020]
【The invention's effect】
According to the lighting apparatus of the first aspect, the light distribution angle control member controls the light direction emitted from the light emitting portion of the light guide to be a narrow angle, so that the narrow angle light distribution is performed without reducing the efficiency. realizable.
[0021]
According to the lighting apparatus of the second aspect, in addition to the same effect as that of the first aspect, since the opening area can be increased, the amount of emitted light can be increased and the efficiency can be increased.
[Brief description of the drawings]
FIG. 1A is a schematic cross-sectional view of a first embodiment of the present invention, and FIG. 1B is a schematic cross-sectional view showing an emitted light beam thereof.
FIG. 2 is a schematic sectional view of a second embodiment.
3A is a schematic sectional view of a third embodiment, and FIG. 3B is a schematic sectional view of a louver sheet.
4A is a schematic sectional view of a fourth embodiment, FIG. 4B is a perspective view of a triangular microprism sheet, FIG. 4C is a perspective view of a kamaboko-shaped microprism sheet, and a microprism. It is a partial side view of the light guide in a state where a seat is installed.
5A is a schematic cross-sectional view of a conventional example, and FIG. 5B is a schematic cross-sectional view of a state in which a reflector having a narrow-angle light distribution is configured.
[Explanation of symbols]
1 Light Guide 2 Light Output Part 3 Light Distribution Angle Control Member

Claims (2)

A cylindrical light guide having a light emitting portion; and a light distribution angle control member provided in the light emitting portion along a central axis direction of the light guide, wherein the light distribution angle control member is formed of the light guide. Reflects light emitted from the light emitting portion by being inclined toward the outer side of the light guide at both sides of the light emitting portion facing in the circumferential direction and having a tip approaching the central portion of the light emitting portion. A lighting fixture that is a plate-like reflecting member. The lighting fixture according to claim 1, wherein an opening angle of the light emitting portion of the light guide is approximately 120 degrees to approximately 180 degrees.

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