JPH034402A - Lighting apparatus - Google Patents

Abstract

PURPOSE:To strictly control light distribution and illuminate a required place by reflecting all the light irradiated to an upper reflecting plate with a lower reflecting plate, irradiating light downward, reflecting light downward from the lower reflecting plate because the light source is located at the focus of the parabolic lower reflecting plate, and irradiating light directly through part of the upper portion of an opening of the reflector. CONSTITUTION:All the light irradiated to an upper reflecting plate 13 constituted with a plurality of arcuate cylindrical reflecting plates of different curvatures is reflected with a lower reflecting plate 14. The light is further reflected downward with the lower reflecting plate 14 formed in a parabolic surface. Because a light source 18 is located at the focal point of the lower reflecting plate 14, reflected light is directed horizontally in a specified direction. Direct light from the light source 18 is irradiated through part of the upper portion of a front opening of a reflector 12. Embedding the lighting apparatus in a ceiling for purposes of illuminating wall surfaces, etc., light distribution may be strictly controlled to illuminate a desired place.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to the improvement of lighting equipment, particularly for wall lighting embedded in the ceiling of a building, road lighting from a low position, etc., where light distribution is strictly controlled. Concerning necessary improvements to lighting equipment.

[Conventional technology]

Conventionally, in order to illuminate paintings mounted on the walls of galleries, etc.,
Illumination is carried out either by direct-mounted lighting fixtures directly supported on the ceiling surface or by recessed lighting fixtures.

When illuminating with a built-in lighting device, for example, as shown in Fig. 6, an arcuate reflector 1 whose origin is at the center of the light source and a parabolic reflector 2 whose focal point is the light source are placed above the light source. Lighting equipment that has a reflector that combines these has been implemented.

[Problem to be solved by the invention]

However, since the light reflected by the arc with the origin at the center of the light source returns to the light source, the temperature of the light source rises, which has the disadvantage of shortening the life of the lamp, especially when using an HID lamp.

In addition, the reflected light from the arcuate reflector is projected in front of the lighting fixture as diffused light, which increases the illuminance directly in front of the lighting fixture, making this area particularly bright, resulting in uneven illuminance overall. There is.

In order to solve this unevenness of illumination, it is possible to install a louver over the entire front opening of the lighting fixture to cut out the diffused light, but this structure has the drawback of lowering the efficiency of the fixture and causing insufficient illuminance. be.

[Purpose of the invention]

The present invention was invented in view of the above points, and it is possible to strictly control the light distribution of the lighting equipment to illuminate the illuminated surface relatively uniformly, and to reduce the amount of reflected light returning to the light source. It can suppress the temperature rise of the light source and prevent shortening of the lamp life.

Another object of the present invention is to provide a lighting fixture that does not cause a decrease in fixture efficiency or lack of illuminance.

[Means to solve the problem]

In order to solve the above problems, the present invention has the following configuration. That is, for example, a reflector is housed inside a box-shaped lighting device body, and a high-pressure sodium lamp, metal halide lamp, or the like is mounted inside the reflector so as to face laterally.

Further, the reflector is composed of reflecting plates having different shapes above and below the center of the light source.

The upper reflector is composed of an arc-shaped cylindrical reflector and an arc-shaped cylindrical reflector with a large curvature that is connected to the cylindrical reflector. The lower reflector is a parabolic reflector whose focal point is the light source.

Furthermore, the center of the arc of the upper reflector is set at a location other than the center of the light source, and the reflected light from the light source of the arc of the upper reflector is
All of the light is reflected by the lower parabolic reflector, and the light is irradiated in front of the illumination device by secondary reflection. Further, the structure is such that the reflected light from the tube that is projected from the light source onto the lower parabolic reflector plate is irradiated directly forward.

In addition, a light shielding body or semi-transparent body is placed in front of the lower side of the light source.
The reflector is configured to cut or attenuate direct light from the light source except for a part of the upper part of the front opening of the reflector.

[Effect]

According to the above-described lighting equipment, all the light projected onto the upper reflector formed by connecting a plurality of arc-shaped cylindrical reflectors with different curvatures is reflected by the lower reflector; Irradiation is directed downward from the horizontal direction from the lower reflector configured in a parabolic shape.

On the other hand, since the lower reflector focuses on the light source, the reflected light is reflected horizontally in a set direction.

In addition, since the direct light from the light source is emitted from a part of the upper part of the front opening of the reflector, for example, the same lighting equipment may be embedded in the ceiling of a building and used as a wall lighting equipment to illuminate the wall, so that the light distribution is strictly controlled. It can be controlled and illuminate desired areas.

Furthermore, since the center of the upper reflector is located behind the light source, the reflected light from the upper reflector passes through the upper part of the light source and does not return to the light source, thereby suppressing the temperature rise of the light source.

In addition, the light directed directly below is controlled by a light blocking body or semi-transparent body placed in front of the lower side of the light source, and the reflected light from one reflector is directed downward, so if it is installed in a low place on the road, for example, A driver can drive safely without feeling glare.

〔Example〕

The present invention will be explained below with reference to FIGS. 1 to 5. In FIG. 1, 11 is a box-shaped lighting fixture body, 12 is a reflector configured to be housed inside the lighting fixture body 11, It consists of an upper reflector 13 located above the center of the light source and a lower reflector 14 located below the center of the light source.

Further, the upper reflecting plate 13 includes an arc-shaped cylindrical reflecting plate 15,
It is composed of a sympathic reflecting plate 15 and an arc-shaped cylindrical reflecting plate 16 with a large curvature.

Although the upper reflector 13 is constructed by connecting two cylindrical reflectors with different curvatures, it may also be constructed using two to four cylindrical reflectors with different curvatures. The lower reflector 14 is composed of a parabolic reflector 17 whose focal point is the light source.

Furthermore, the center of each arc of the upper reflector 13 is set at a location other than the center of the light source, and as shown in FIG. The center of the arc is set so that the light is reflected by the shaped reflection plate 14 and irradiated in front of the lighting equipment by secondary reflection.

Further, as shown in FIG. 4, the light reflected from the recirculation portion projected from the light source onto the lower parabolic reflector 14 is configured to be irradiated directly forward.

The center R1 of the arc of the reflector 12 is set behind the center 0 of the light source, as shown in FIG. ZOCR2=α, 1R2CB=β created by the lower part B of the paraboloid
Then, R2 is set so that α≧β.

Reference numeral 18 denotes a light source, the upper half of which is housed in the inner part of the upper reflector and arranged at the focal point of the lower reflector 14. The light source is, for example, a high pressure sodium lamp or a metal halide lamp.

Reference numeral 19 denotes a light shielding body or a semi-transparent body provided below and in front of the light source 18. The light shielding body is constructed using, for example, a louver, and the semi-transparent body is, for example, a punched metal plate having a large number of holes. Configure using.

According to the lighting fixture with the above configuration, by placing the light source at the 0 point in Figure 2, all of the reflected light from the arc-shaped portion of the upper reflector will be directed to the paraboloid of the lower reflector as shown in Figure 3. incident.

Further, since the center R1 of the upper reflector is located behind the center of the light source, the reflected light does not return to the light source, the temperature rise of the light source is suppressed, and the reflected light always enters the paraboloid of the lower reflector.

Furthermore, since the center of the arc of the upper reflector 12 is set so that α≧β, all reflected light from the light source passes through the rear of the light source and is always incident on the paraboloid of the lower reflector.

Further, since the lower reflector located below and behind the light source focuses on the light source, the reflected light is reflected in a set direction as shown in FIG.

On the other hand, since all the light that enters the paraboloid of the lower reflector from the arc-shaped part of the upper reflector passes above and behind the light source, the secondary reflected light from the paraboloid of the lower reflector is the third As shown in the figure, the light is reflected downward from the light directly reflected by the paraboloid of the lower reflector from the light source.

Further, the direct light radiated directly forward from the light source has an angle of θ, as shown in FIG. = ZAOB, but by placing the light shielding body or semi-transparent body in front of the line connecting 4 and OB, the direct light is θ'. Direct light directly below can be controlled by changing the size of the light shield or semi-transparent body.

Next, an example of mounting the above-mentioned lighting equipment will be explained with reference to FIG.

In FIG. 5, reference numeral 11 indicates a lighting fixture embedded in the ceiling of a gallery or the like, and is installed at a location approximately 50a1 from the wall.

With this configuration, the person viewing the painting is generally at least 50 meters away from the wall, so the light from the lighting equipment does not directly enter the viewer's eyes, and the viewer perceives glare due to relatively averaged illuminance. It can be admired.

In addition, if the lighting equipment is located at a relatively low point on both sides of the road, there will be no direct light or reflected light directed upwards from the lighting equipment, so the light will not enter the vision of the car driver. , can reduce glare and drive safely.

〔Effect of the invention〕

According to the present invention described above, all of the light projected onto the upper reflector is reflected by the lower reflector, and further irradiated from the lower reflector in a downward direction from the horizontal direction, while the lower reflector focuses on the light source. Therefore, the reflected light is reflected downward to the set point, and the direct light from the light source is irradiated from the upper part of the front opening of the reflector, so the light distribution is strictly controlled and the rate of device change is reduced. It is possible to illuminate a desired location without any overhead, and is useful as wall lighting or road lighting from a relatively low location.

In addition, since the center of the upper reflector is located behind the light source, the reflected light from the upper reflector passes through the top of the light source and does not return to the light source, which suppresses the temperature rise of the light source and shortens the life of the light source. It can be prevented.

In addition, the light directly below is controlled by a light blocking body or a semi-transparent body provided below and in front of the light source, and the illumination intensity can be adjusted depending on the location of use.

[Brief explanation of drawings]

Figure 1 is a side view of the lighting fixture according to the present invention, Figures 2 to 4 are examples of the reflector in Figure 1, Figure 5 is an example of the use of Figure 1, and Figure 6 is a conventional It is a side view of the reflective plate of a lighting fixture. 11...Lighting device main body 12...Reflector 13...Upper reflector 14...Lower reflector 18...Light source 19... Light shielding body or semi-transparent body FIG.

Claims (1)

[Claims] 1. A lighting device in which a reflector is housed inside a box-shaped lighting device body and a light source is mounted inside the reflector, wherein the reflector is located from the center of the light source. The upper and lower parts are composed of reflectors of different shapes, and the upper reflector is composed of an arc-shaped cylindrical reflector and an arc-shaped cylindrical reflector with a large curvature connected to the cylindrical reflector, The lower reflector is composed of a parabolic reflector with the light source as its focus, and the center of the arc of each cylindrical reflector of the upper reflector is set at a location other than the center of the light source. All of the reflected light from the light source in the arc-shaped part of the lamp is irradiated onto the parabolic reflector at the bottom, is configured so that it is irradiated in front of the lighting equipment by secondary reflection, and is further projected from the light source to the lower reflector. A lighting device characterized in that the light reflected from the same part is directly irradiated forward. 2. Place a light shielding body or semi-transparent body in front of the lower side of the light source,
2. The lighting device according to claim 1, wherein the lighting device is configured to cut or attenuate direct light from the light source except for a part of the upper part of the front opening of the reflector.