JPS60175304A - Illuminator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a lighting fixture, and relates to a reflector plate for a fixture installed on an indoor ceiling, for example, which is designed to provide rectangular light distribution.

[Technical background of the invention]

In conventional lighting equipment of this kind, one reflecting plate is formed of a parabolic line rotating body, and the pattern of irradiation onto the floor from the irradiation port of such a reflecting plate is circular.

A rectangular irradiation pattern cannot be obtained, and the irradiation pattern.

It has the disadvantage of poor uniformity, with shadows appearing at the corners.

For example, Japanese Patent Application Laid-Open No. 58-57205,
Like the lighting equipment described in Publication No. 8-166602, a light control prism is provided at the irradiation port, and the prism controls light so that the source output from the irradiation port forms an internal illumination pattern. It has been known.

[Problems with background technology]

Conventional equipment that uses the above-mentioned light-control prism to obtain a rectangular plate pattern requires a prism cover.
It has the disadvantage of being expensive.

[Purpose of the invention]

The present invention has been made in view of the above drawbacks, and is an illumination device that uses a reflector to produce a square-shaped irradiation pattern from the irradiation port onto the floor surface without using a prism cover or the like, thereby providing well-balanced illumination. It provides equipment.

[Summary of the invention]

The present invention increases the number of reflection sources at the corners of the irradiation pattern by changing the horizontal cross-sectional shape of the reflector, and uses a light source such as a mercury lamp and a reflector that includes the light source and has an irradiation port opening on the bottom surface. The reflecting plate has a vertical cross-sectional shape that is a quadratic curved surface, and a horizontal cross-sectional shape that is a part of a circle that is symmetrical in four directions, with the center point of the circle being located at the center of the light source with respect to the reflecting plate. F) It is characterized by having a shape that is spaced apart, and the angle between the reflected light in the circular part of the horizontal cross section of the reflector and the original axis is made large.

[Embodiments of the invention]

Next, the configuration of an embodiment of the present invention will be explained with reference to the drawings.

(1) The light source is a high-intensity discharge lamp (H
ID) and other lamps.

Further, (2) is a reflector plate containing the lamp (1), which has an irradiation port (3) opened on the lower surface and whose vertical cross section is formed into a quadratic curved surface 14) such as a parapet surface. Also, this reflector (
The horizontal cross-sectional shape of 2) is a circular part of a curve that is symmetrical in four directions [
51 (51+51 +51), and a part of this circular curve (51151i51 (the center point (0) of 51 is located at the center of the lamp (2) located at the center of the light emitting part of 11 (g) Position (shaped as Q).

Furthermore, a substantially cylindrical base (6) is provided at the top of the reflector (2).
are integrally formed, and a lamp il+ is provided on the top surface of the base (61).
A socket (7) is provided for mounting the.

Next, the operation of this embodiment will be explained.

The lamp moves from the lamp (1) to the reflector plate (2) when l lights up.
[The emitted light is reflected by the mirror-like reflective surface of the reflector plate (2), and the light is output from the irradiation port (3). As shown in Figure 5, in the horizontal section of the reflector plate (2), the direction of reflection at the reflective surface (8) above the light emission center of the lamp ill (θ=0°) is 0°, but the angle θ0 is large. I see that the line connecting the light emission center (goods) of the light-emitting center (goods) of the angle formed with the optical axis (in other words, the lamp +1) and the reflection point (S) of the reflector plate (2) and the curve (5) of a part of the circle Center point and reflector (2)
The angle formed by the line connecting the reflection point ■ is (A), the radius of the curve (5) of a part of the circle is ■, and the distance from the light emitting center [F] of the lamp ill to the reflector (2) is ( α), then Sinθ(R-a) 1st nβ=□□ α=θ-2β, and in the horizontal section of the reflector (2), the incident angle (θ) of the light to the reflector (2) becomes large. The angle formed with the optical axis of the root bark light (the angle becomes larger, so the reflected light Q light distribution at the center of the curve (5) of the horizontal cross section of the reflector (2) expands, The reflection angle at each point is as shown in the irradiation pattern (9) shown in Figure 1.

This results in a rectangular horizontal illuminance distribution.

〔Effect of the invention〕

According to the present invention, the horizontal cross-sectional shape of the reflector whose vertical cross-sectional shape is a quadratic curved surface is formed by a partial curved surface of a circle symmetrical in four directions, and the center point of this circle is spaced apart from the center of the light source with respect to the reflector. Because of the position, the horizontal illuminance distribution can be made into a rectangular shape without using a prism cover for the irradiation port of the single reflector, and rectangular illumination can be performed with good precision and can be obtained at low cost.

[Brief explanation of the drawing]

Figure 1 is a bottom view of a lighting fixture showing one embodiment of the present invention, Figure 2 is a vertical cross-sectional side view of the same, Figure 5 is an explanatory view of the same, and Figure 4 is an irradiation pattern diagram of the same. +11.11 source lamp, (2)...reflector, (3)
+111 irradiation port.

Claims (1)

[Claims] 111 Consists of a light source and a reflecting plate that contains the light source and has an irradiation port opening on the bottom surface, and the reflecting plate has a vertical cross-sectional shape as a quadratic curved surface, and a horizontal cross-sectional shape as a part of a circular shape symmetrical in four directions. A lighting fixture characterized in that the center point of the circle forming the shadow is located at a position spaced apart from the center of the light source with respect to the reflecting plate.