JPH10144121A - Luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To change light distribution shape easily and to attempt uniformity of illuminance distribution on an illuminated screen. SOLUTION: This luminaire has a light transmitting aperture in the front and is provided with a reflection plate 4 which has a circular light distribution shape to be arranged covering almost whole area around a light source 2. In this case an anisotropic diffusion film 5 which has a property at one direction to diffuse and transmit light of which angle of incidence is smaller than a prescribed angle and also to transmit light of which angle of incidence is larger than the prescribed angle without diffusion and on the other direction lying at right angles to one direction has an uniform property to correspond with one direction is pasted in front of the light transmitting aperture.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a lighting fixture.

[0002]

2. Description of the Related Art FIGS. 6 and 7 show a conventional lighting fixture (first conventional example). This lighting fixture is a spotlight, and includes a fixture body 1, a light source 2, and a transparent filter. It is provided with a plate 3 and a reflection plate 4.

[0003] The appliance body 1 is fixed to the ceiling, and is formed in a substantially cylindrical shape with a bottom having a circular light-transmitting opening on one side.
A light source 2 is mounted inside the light source 2 so as to face the light-transmitting opening side, and a substantially bowl-shaped reflecting plate that controls light emitted from the light source 2 so as to substantially cover the periphery of the light source 2 to obtain a circular light distribution. 4 are accommodated. As shown in FIG. 7, a ring-shaped light-shielding plate is provided in front of the light source 2 so as to prevent light from the light source 2 from leaking to the side of the light-transmitting opening. , A transparent filter plate 3 such as a color filter that transmits light from the light source 2 so as to cover the light transmitting opening side.
a.

FIG. 8 shows another conventional lighting apparatus (second lighting apparatus).
This lighting fixture is disclosed in Japanese Utility Model Laid-Open No. 5-48106, and includes a substantially bowl-shaped reflecting plate 4 which is disposed so as to substantially cover the light source 2. An anisotropic diffusion film (anisotropic diffusion plate in the publication) 5 is arranged in a light-transmitting opening (light-emitting opening in the publication) on the front side. The anisotropic diffusion film 5 has a property of refracting and transmitting light having an incident angle smaller than a predetermined angle in one direction, and diffusing and transmitting light having an incident angle equal to or more than a predetermined angle, and is orthogonal to one direction. The other direction has a uniform property corresponding to one direction. For this reason, light that is transmitted in the front direction substantially perpendicular to the light-transmitting opening of the lighting fixture is transmitted, and light whose incident angle is larger than that, that is, light that is directed diagonally forward is diffused and transmitted, and the lighting fixture is It is designed to reduce glare when viewed obliquely from the front.

[0005]

However, in the lighting device shown in the first conventional example as described above, when it is desired to change the light distribution shape, it is necessary to replace the reflecting plate 4 according to the light distribution shape. There is a problem that it is necessary to design and manufacture the reflection plate 4 for the type of the light distribution shape, and a mold or the like is required accordingly.

When a mask is attached to the light-transmitting aperture side to make the light distribution different from the circular light distribution, the light from the light source 2 is partially shielded by the mask. However, there has been a problem that the efficiency of the apparatus is reduced.

[0007] Further, in the lighting equipment shown in the second conventional example,
The light projected in the direction perpendicular to the light-transmitting aperture of the lighting fixture is transmitted, and the other light is diffused and transmitted. Weakened,
There is a problem that the illuminance on the irradiation surface becomes uneven.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a lighting device capable of easily changing a light distribution shape and achieving a uniform illuminance distribution on an irradiation surface. It is to provide a device.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to the first aspect of the present invention, which has a light-transmitting opening on the front side and substantially covers the periphery of the light source. In a lighting apparatus having a reflecting mirror provided, light having an incident angle smaller than a predetermined angle is diffused and transmitted in one direction, and light having an incident angle equal to or more than the predetermined angle is transmitted in one direction. An anisotropic diffusion film having a property of transmitting light without being diffused and having a uniform property corresponding to the one direction is provided in another direction orthogonal to the one direction.

According to the second aspect of the present invention, the first aspect is provided.
The lighting device according to any one of the preceding claims, wherein the reflector is a circular light distribution reflector.

[0011]

1 to 5 show an embodiment of a lighting fixture according to the present invention. The lighting fixture comprises a fixture body 1, a light source 2, a transparent filter plate 3, and a reflecting plate. 4 and an anisotropic diffusion film 5.

The apparatus main body 1 is fixed to a ceiling, and is formed in a substantially cylindrical shape with a bottom having a circular light-transmitting opening on one side.
A light source 2 is mounted inside the light source 2 so as to face the light transmitting opening side. A substantially bowl-shaped reflector 4 for controlling the light emitted from the light source 2 to obtain a circular light distribution is provided in the instrument body 1 so as to be disposed so as to substantially cover the periphery of the light source 2. In front of the light source 2, a ring-shaped light-shielding plate for preventing light from the light source 2 from leaking to the side of the light-transmitting opening is provided. A transparent filter plate 3 such as a color filter for transmitting light is attached via a mounting frame 3a so as to cover the light-transmitting opening with an anisotropic diffusion film 5 attached to the surface thereof.

FIG. 2 shows an anisotropic diffusion film 5 attached to a transparent filter plate 3. The anisotropic diffusion film 5 has an optical performance in one direction and an incident angle of a predetermined angle. In addition to diffusing and transmitting light smaller than θ, light having an incident angle equal to or larger than a predetermined angle θ is refracted and transmitted without diffusing, and the optical performance in the other direction orthogonal to one direction is uniform in one direction. That is, it has such a property that a part that diffuses and transmits and a part that refracts and transmits without diffusing are strip-shaped in the other direction. The predetermined angle θ is set to, for example, 15 °, 25 °, or the like. Therefore, when the light source 2 is placed at an arbitrary point with respect to the anisotropic diffusion film 5, the center of the intersection of the perpendicular line drawn from the arbitrary point to the anisotropic diffusion film 5 and the anisotropic diffusion film 5 is centered. Within the predetermined width is a diffuse transmission portion of light incident from an arbitrary point, and the outside thereof is not a diffusion transmission portion but a refraction transmission portion, and even if an arbitrary point is moved in one direction, it is always It has such a property.
In addition, as such an anisotropic diffusion film 5, for example, a front opaque type of a view control film “Lumisty” (registered trademark of Sumitomo Chemical Co., Ltd.) manufactured by Sumitomo Chemical Co., Ltd. is exemplified.

As described above, when the anisotropic diffusion film 5 is attached to the transparent filter plate 3 of a lighting device having a circular light distribution, the circular light distribution as shown in FIG. ), So that the light distribution becomes substantially elliptical. That is,
When the light from the light source 2 passes through the anisotropic diffusion film 5, it becomes elongated in one direction due to the anisotropy, and becomes an elliptical distribution in which the circular light distribution shape 7 a is elongated in one direction. The light shape 7b is obtained.

As described above, in the lighting fixture of the present embodiment, since the anisotropic diffusion film 5 is disposed in the light-transmitting opening on the front side of the lighting fixture, in the direction parallel to one direction of the anisotropic diffusion film 5, Light incident on the anisotropic diffusion film 5 at an angle smaller than the predetermined angle θ among the direct light from the light source 2 and the light reflected on the reflector 4 is diffused and transmitted, and is incident on the anisotropic diffusion film 5 at an angle equal to or larger than the predetermined angle θ. Is refracted and transmitted, and in the central part, which is directly below the light source 2 and has a large amount of incident light, a large amount of light having a small incident angle is transmitted. At the side, the angle of incidence increases and the light is refracted and transmitted. For this reason, the amount of light on the center side on the irradiation surface is smaller than that without the anisotropic diffusion film 5, while the amount of light incident on the side by light diffused on the center side increases, The illuminance distribution can be made uniform on the irradiation surface, and the anisotropic diffusion film 5 allows the anisotropic diffusion film 5 to easily transform the circular light distribution 7a in one direction into an elliptical light distribution 7b or the like. If the anisotropic diffusion film 5 is rotated, the direction of the irregular light distribution, which is the major axis direction of the light distribution, can be easily changed.

Further, since the light distribution shape can be changed by attaching the anisotropic diffusion film 5 to the transparent filter plate 3, it is not necessary to design and manufacture the reflection plate 4 according to the light distribution shape, and the mask can be used. Even if the light distribution is not used, the light distribution can be different from the circular light distribution, so that the efficiency of the apparatus does not deteriorate.

FIG. 4 shows an example of illuminating a picture displayed on a wall with the lighting fixture according to the present embodiment.
When the transparent filter plate 3 is rotated, an elliptical light distribution shape 7 is obtained.
b will also be rotated, so that the long axis direction of the light distribution shape can be changed according to the orientation of the painting 8 displayed on the wall surface, so that the entire painting 8 can be illuminated and the irradiation surface can be illuminated. Since the above illuminance can be made uniform, it leads to protection of the irradiation target such as the painting 8.

As shown in FIGS. 5A and 5B,
In the case of illuminating the passage, the lighting fixtures are buried in a row as ceiling lights in the ceiling, and are illuminated so as to cover the portion to be illuminated with the long axes of the respective elliptical light distribution shapes 7b of the respective lighting fixtures aligned. For example, the number of luminaires to be installed can be reduced as compared with the case where the illuminated portion is illuminated with the circular light distribution shape 7a, and the elongated illuminated surface can be efficiently illuminated. Further, for example, as shown in FIG. 5 (c), when it is desired to obtain a rectangular portion to be illuminated, the lighting fixtures are arranged in a plurality of rows, and the length of the elliptical light distribution shape 7b of each lighting fixture in each row. What is necessary is just to irradiate so that the direction of an axis may be matched and the irradiated part may be covered.

In each of the above embodiments, the light source 2 used may be any of a halogen bulb, a reflex bulb, a frost-based bulb, a fluorescent lamp, and the like.

[0020]

According to the first aspect of the present invention, since the anisotropic diffusion film is provided in the light-transmitting opening on the front side of the luminaire, the anisotropic diffusion film is provided. In the direction parallel to one direction, of the direct light from the light source and the light reflected by the reflector, light incident on the anisotropic diffusion film at a predetermined angle or less is diffused and transmitted, and light incident at an angle larger than that. Is refracted and transmitted, and in the central part under the light source where there is a lot of incident light, there is much light with a small incident angle. In this case, the incident angle becomes large and the light is refracted and transmitted. For this reason, the amount of light on the center side on the irradiation surface is smaller than when there is no anisotropic diffusion film, and on the other side, the amount of light incident on the center side due to the light diffused on the center side increases. In addition to achieving uniform illuminance distribution above, a light distribution shape in which the light distribution shape is extended in one direction due to the anisotropy of the anisotropic diffusion film can be easily obtained, and if the anisotropic diffusion film is rotated, The direction of light distribution can be easily changed.

Further, since the light distribution shape can be changed by attaching the anisotropic diffusion film to the transparent filter plate, there is no need to design and manufacture a reflector according to the light distribution shape, and without using a mask. Since the shape of the light distribution can be changed, the efficiency of the apparatus does not deteriorate.

According to the second aspect of the present invention, since the reflecting plate provided to substantially cover the periphery of the light source is a circular light distribution reflecting plate, a circular distribution is provided by the anisotropy of the anisotropic diffusion film. The light shape can be changed to an elliptical light distribution shape that is elongated in one direction, and the number of luminaires to be installed can be reduced compared to the case of illuminating an illuminated surface having an elongated shape with a circular light distribution shape. Can be irradiated.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a main part of an embodiment of a lighting fixture of the present invention.

FIG. 2 is a cross-sectional view for explaining the properties of the anisotropic diffusion film.

FIGS. 3A and 3B show a light distribution shape in the above, wherein FIG. 3A is a plan view of a circular light distribution shape, and FIG. 3B is a plan view of an elliptical light distribution shape.

FIG. 4 is a schematic view showing an example of use of the above.

FIG. 5 is a plan view showing an irradiation pattern when a passage is used as an irradiation surface;
(b) is a schematic diagram of the above, and (c) is a plan view showing an irradiation pattern when a rectangular irradiation surface is illuminated.

FIG. 6 is a perspective view showing a conventional lighting fixture (first conventional example).

FIG. 7 is an exploded perspective view showing a main part of the above.

FIG. 8 is a schematic diagram showing another conventional lighting fixture (second conventional example).

[Explanation of symbols]

 2 light source 4 reflector 5 anisotropic diffusion film

Claims (2)

[Claims] 1. A lighting apparatus having a light-transmitting opening on the front side and a reflecting mirror disposed so as to substantially cover the periphery of a light source, wherein an incident angle is set in one direction on the front side of the light-transmitting opening. It has a property of diffusing and transmitting light smaller than a predetermined angle and transmitting light having an incident angle equal to or larger than the predetermined angle without diffusing, and the other direction orthogonal to the one direction corresponds to the one direction corresponding to the one direction. A lighting device comprising an anisotropic diffusion film having similar properties. 2. The lighting apparatus according to claim 1, wherein the reflector is a circular light distribution reflector.