JPS645288Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field] This invention relates to a lighting fixture that is embedded and fixed in a ceiling or the like.

[Background technology]

As shown in FIG. 4, in the conventional lighting equipment, a diffusion panel 2 is attached to the upper opening of a cylindrical concave reflector 1 with upper and lower openings, and a clear type lamp (HID lamp) 3 is installed behind this diffusion panel 2. are placed. In this case, the clear type lamp 3 is made up of a transparent glass tube 3a arranged parallel to the diffusion panel 2, and an arc tube 3b housed in the center of the tube axis, and is attached to a pair of sockets 4a and 4b. . Note that the illustration of the main body of the instrument is omitted.

Such lighting equipment creates a plane light source by diffusing the light from the arc tube 3b of the clear lamp 3, which is a point light source, with the diffusion panel 2, and reflects the light of this plane light source with the concave reflection plate 1. It is designed to illuminate the floor below.

However, such conventional lighting equipment
Since only the direct light from the arc tube (light source) 3b is irradiated onto the diffusion panel 2, the brightness of the panel surface of the diffusion panel 2 decreases as it moves away from the center of the light source. ₁ ,
The brightness is high as shown by A ₂ , but the peripheral area is marked by arrow B ₁ ,
As shown in B ₂ , the brightness decreases, and as a result, the fifth
As shown in FIG. 5A, there is a problem that the amount of light from the peripheral portion of the diffusion panel 2 is small (the length of the arrow indicates the amount of light), and therefore the light distribution is narrow as shown in FIG. 5B.

[Purpose of invention]

The purpose of this invention is to provide a lighting fixture that can widen the light distribution.

[Disclosure of invention]

The lighting equipment of this invention includes a cylindrical lower reflector with upper and lower openings, a diffusion panel attached to the upper opening of the lower reflector, and a diffusion panel placed behind the diffusion panel to irradiate light to the diffusion panel. The present invention is characterized in that it includes a light source and an upper reflecting plate that reflects light from the point light source and irradiates the peripheral edge of the diffusion panel.

In this way, a diffusion panel is attached to the upper opening of a cylindrical lower reflector with upper and lower openings, a point light source is placed behind the diffuser panel, and an upper reflector is placed to surround this point light source. Therefore, by irradiating the periphery of the diffuser panel with the light from the point light source, the brightness of the panel surface is made almost uniform by the direct light from the point light source and the indirect light from the upper reflector, and the light irradiated from the panel surface is distributed to the lower part. Since the light is reflected by the reflector and illuminated downward, the light distribution can be expanded.

Embodiment An embodiment of this invention will be explained based on FIGS. 1 to 3. As shown in FIGS. 1 and 2, in this lighting fixture, a diffusion panel 2 is attached to the upper opening of a cylindrical lower concave reflector 1 with upper and lower openings, and a clear lamp ( H.I.D.
A rotationally symmetrical upper concave reflection plate 5 is arranged so that the light from the arc tube 3b of the clear type lamp 3 is focused on the peripheral edge of the diffusion panel 2. In this case, the clear lamp 3 is constructed by housing a light emitting tube 3b in the center of a transparent glass tube 3a in the axial direction of the transparent glass tube 3a, which is arranged parallel to the diffusion panel 2.
It is attached to the sockets 4a and 4b with the upper concave reflecting plate 5 passed through in the lateral direction.

This lighting equipment reflects the light from the arc tube 3b of the clear lamp 3, which is a point light source, onto the periphery of the diffuser panel 2 by the upper concave reflector 5, so that direct light from the arc tube 3b is reflected. In addition, the light is irradiated almost uniformly onto the diffusion panel 2, and by diffusing this light, a flat light source with almost uniform brightness is created, and the light from this flat light source is reflected by the lower concave reflector 1 to illuminate the floor below. It is designed to illuminate surfaces, etc.

In this way, the light from the arc tube 3b is reflected onto the peripheral edge of the diffusion panel 2 as shown by the arrow C by the upper concave reflection plate 5, so that the light is almost uniformly irradiated onto the diffusion panel 2. , the brightness of the peripheral part of the panel surface of the diffusion panel 2 can be increased to the same level as the brightness of the central part, as shown by arrows D ₁ and D ₂ , and as a result, the brightness of the diffusion panel 2 can be increased as shown in FIG. 3A.
The amount of light from the periphery increases (the length of the arrow indicates the amount of light), and therefore the light distribution becomes wider as shown in FIG. 3B.

Further, the directionality of the light distribution characteristic due to the directionality of the arc tube 3b is relaxed by the diffusion panel 2, and the light shielding angle can be made almost the same over the entire circumference of the lower concave reflector 1. In addition, since the light is diffused by the diffusion panel 2, even if the reflective surface of the lower concave reflector 1 is mirror-finished, the illuminance of the floor surface, etc. can be made uniform, and therefore the lower concave reflector 1 It also reduces glare when looking at the screen.

[Effect of idea]

The lighting equipment of this invention reflects the light from the point light source with the upper reflector to irradiate the diffuser panel with light almost uniformly, making the brightness of the panel surface of the diffuser panel almost uniform, which improves the light distribution. Can be expanded.

[Brief explanation of drawings]

Figure 1 is a sectional view of a lighting fixture according to an embodiment of this invention, viewed from a direction perpendicular to the axis of the lamp tube;
The figure is also a cross-sectional view seen from a direction parallel to the lamp tube axis direction, and Figures 3A and 3B are explanatory diagrams of the light distribution of the embodiment.
FIG. 4 is a cross-sectional view of a conventional lighting device viewed from a direction perpendicular to the lamp tube axis direction, and FIGS. 5A and 5B are illustrations of light distribution in the conventional example. 1... Lower concave reflector, 2... Diffusion panel, 3
...Clear lamp (point light source), 5...Top concave reflector.

Claims (1)

[Scope of utility model registration request] The lighting fixture comprises a cylindrical lower reflector having upper and lower openings, a diffusion panel attached to the upper opening of the lower reflector, a point light source disposed behind the diffusion panel and irradiating light onto the diffusion panel, and an upper reflector that reflects the light from the point light source and irradiates it onto the peripheral portion of the diffusion panel.