JPH03196405A - Reflecting mirror for illumination apparatus - Google Patents

Abstract

PURPOSE:To unify the illuminance on a radiated surface by arranging rectangular or turtle shell-shaped fine reflection sections continuously and radially in a line so that the centers of the fine reflection sections are aligned in a straight line in the cross section direction containing the center axis of a reflecting mirror. CONSTITUTION:Fine reflection sections 2 with a rectangular or turtle shell-shaped contour are concentrically arranged on a reflecting mirror 1 made of an Al material and opened upward and downward so that the peripheral angle between centers of the adjacent reflection sections 2 as seen from the center toward the peripheral direction of the reflecting mirror 1 is made equal for all adjacent reflection sections 2, and the fine reflection sections 2 are arranged in zigzag so that the peripheral angle between centers of the adjacent reflection sections 2 in the cross section direction containing the center axis of the reflecting mirror 1 is made 1/2 of the peripheral angle between centers of the adjacent reflection sections 2 in the peripheral direction. A drift occurs by a half of the stripe occurrence pitch between the strength of the light generated on a certain reflection section 2 and the strength of the light generated on the adjacent reflection section 2 in the cross section direction, a portion with the strong light and a portion with the weak light are nearly overlapped, the strength of the light is offset, and the light distribution in a pattern 4 is unified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to the structure of a reflecting mirror for lighting equipment used in spotlights, downlights, and the like.

[Conventional technology]

Generally, in lighting equipment such as spotlights and downlights used for stores, etc., a rotating reflector with a smoothly curved cross section, such as a parabolic cross section, is used to control light distribution. , has a structure in which a light source is arranged on the central axis of the inner surface of the reflecting mirror. In this type of lighting equipment, in order to display a beautiful irradiation pattern on the irradiated surface through light distribution control, uneven light and light concentration caused by the shape of the lamp filament (for example, coil shape) on the irradiation pattern are a problem. It has been said that

Therefore, in order to reduce the light unevenness and light concentration unevenness, conventionally, a large number of rectangular or tortoise-shaped minute reflection parts made of minute convex, concave, or flat surfaces are provided on the inner surface of the reflecting mirror to appropriately scatter the reflected light. Reflectors have been used. However, the micro-reflecting parts are randomly arranged on the reflector by determining only the specifications of the micro-reflecting parts themselves, such as their curvature and size, so that the density of the micro-reflecting parts is uniform throughout the reflector. Not only was it not possible to ensure quality, but processing using automatic machines was also problematic.

In order to solve the above problem, as shown in another conventional example shown in FIGS.
Reflecting mirrors 1 have come to be used in which the centers of the minute reflecting portions 2 are arranged in a continuous line radially in a cross-sectional direction including the central axis of the reflecting mirror 1.

[Problem to be solved by the invention]

By the way, in the conventional reflecting mirror 1 for a lighting device having such a configuration, the minute reflecting portions 2 are continuously arranged in a line in a cross-sectional direction including the central axis of the reflecting mirror 1, and the lamp 3 is on the central axis of the reflecting mirror 1, each of the minute reflection parts 2 in the row in the cross-sectional direction has approximately the same intensity of light in the circumferential direction, and the minute reflection in the - row The row adjacent to section 2 also has substantially the same intensity of light in the circumferential direction. Furthermore, considering the above-mentioned groups of two adjacent rows of minute reflecting portions 2 as one set, the reflecting mirror 1 is formed by repeating this set at a constant pitch in the circumferential direction. Now, as shown in FIG. 3(b), the light distribution in the circumferential direction ( If the light intensity (intensity and weakness of light) is curve A, and the light distribution at the same position generated by a group of minute reflection parts 2 next to it is curve B, the overall light distribution is a combination of these curves and becomes like curve C. .

At this time, even if the position at which the light distribution is measured is shifted concentrically inward or outward within the irradiated surface, the peaks and valleys of curve C will occur at the same position in the circumferential direction, and these peaks will be the bright areas where the light is strong. The valley becomes a dark part. Since these peaks or valleys occur at the same position in the circumferential direction within the irradiation pattern 4 as described above,
These interfere with each other and strengthen each other, creating radial strengths and weaknesses.
As shown in FIG. 3(b), this appears as radial unevenness (bright and dark images) within the irradiation pattern 4. This unevenness is caused by the minute reflection part 2.
There is a problem that the number of lines generated is an integral multiple of the number of lines or a divisor thereof, which is unsightly and uncomfortable.

The present invention has been made in view of the above-mentioned background, and its purpose is to equalize the illuminance of the irradiated surface and eliminate unpleasant radial light unevenness that occurs within the irradiation pattern of the irradiated surface. To provide a reflecting mirror for lighting equipment that eliminates unevenness and presents a beautiful irradiation pattern.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention provides a reflector 1 for lighting equipment, in which a substantially bowl-shaped reflector 1 with vertical openings is provided with a large number of minute reflectors 2 having a rectangular or hexagonal outline at least on the inner surface side. , the minute reflection portions 2 of the reflecting mirror 1 are arranged such that all angles formed in the circumferential direction between the centers of adjacent minute reflection portions 2 viewed from the center thereof are equal with respect to the circumferential direction of the reflection mirror 1. They are arranged concentrically so that, with respect to the cross-sectional direction including the central axis of the reflecting mirror l, the angles formed by the centers of adjacent minute reflecting parts 2 in the circumferential direction are adjacent to each other in the circumferential direction. It is characterized in that it is arranged in a staggered manner so that the center of the minute reflection part 2 forms 1/2 of the angle made in the circumferential direction.

[Effect]

Because of the above structure, the strength and weakness of the light generated on one step of the micro reflective surface 2 in the cross-sectional direction of the reflecting mirror 1 and its -
There is a difference of just half the pitch of line generation due to interference between the intensity of the light generated on the minute reflective surface 2 adjacent to the upper or lower side, and therefore, these differ in light distribution (light distribution) in the circumferential direction. The strong and weak parts of the light are different from each other, and these cancel out the strength of the light, making the light distribution uniform on the irradiation pattern 4 within the irradiated surface, and eliminating radial light unevenness and concentration. Eliminate uneven light.

〔Example〕

FIG. 1 shows an embodiment of the present invention, in which (a) is a perspective view of a reflector 1, (b) is a bottom view of the reflector 1 seen from below, and (C) is a view of the reflector I. A perspective view showing the arrangement of the minute reflection sections 2 in a partial view, and (d) a side view showing the arrangement of the minute reflection sections 2.

In this embodiment, a reflecting mirror 1 made of an aluminum material having a substantially bowl-like shape with an opening at the top and bottom has a micro reflecting section 2 having a rectangular or tortoiseshell outline.
As shown in FIG. 1(d), with respect to the circumferential direction of the reflecting mirror 1, the angle formed in the circumferential direction between the centers of adjacent minute reflection parts 2 viewed from the center (for example, minute reflection Part 2a, 2
1) each center 0. ．． 02 to the central axis of the reflecting mirror 1 in the circumferential direction) are arranged concentrically so that the angle made by the perpendicular line drawn from 02 to the central axis of the reflecting mirror 1 is equal between all adjacent minute reflecting parts 2, and the central axis of the reflecting mirror 1 is With respect to the cross-sectional direction including the angle between the centers of adjacent minute reflection sections 2 in the circumferential direction (for example, the center of each minute reflection section 2a, 2c, 0+, 03
so that the angle made by the perpendicular line drawn to the central axis of the reflecting mirror 1 in the circumferential direction) is 1/2 of the angle made by the center of the adjacent minute irregularity part 2 in the circumferential direction. They are arranged in a staggered pattern.

” - Because of the configuration as described above, the difference between the intensity of light generated at a certain minute reflection section 2 and the intensity of light generated at the minute reflection section 2 adjacent to it in the cross-sectional direction is just half the pitch of line generation. Therefore, in the circumferential direction of these minute reflection parts 2, the strong and weak parts of the light almost overlap, and these cancel out the strength and weakness of the light, making the light distribution in the irradiation pattern 4 uniform, and making it radial. Eliminate uneven light.

In addition, in the embodiment, an example was shown in which aluminum material was used as the reflecting mirror 1, but the present invention is not limited to this, and it may be made of a translucent material such as glass material or brass, and a reflective film may be deposited on at least the inner surface thereof. Of course, the minute reflection portions may also be formed by a method such as vapor deposition of a selective transmission or selective reflection thin film.

(Effects of the Invention) Since the present invention is configured as described above, the reflecting mirror of the present invention uniformizes the illuminance of the irradiated surface and eliminates radial light unevenness and light condensing unevenness that occur within the irradiation pattern of the irradiated surface. It is possible to solve this problem and present a beautiful irradiation pattern.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the present invention, in which (a) is a perspective view of a reflecting mirror, (b) is a bottom view of the reflecting mirror seen from below, and (C)
) is a partial view of the reflector, which is a perspective view showing the arrangement of the minute reflection parts, (d) is a side view showing the arrangement of the minute reflection parts, and Figure 2 shows a conventional example, and (a) is a perspective view of the reflector. Figure 3 (b) is a bottom view of the reflector viewed from below, (C) is a partial view of the reflector and a perspective view showing the arrangement of minute reflection parts, and Figure 3 shows the irradiation pattern of a conventional example. (a) is a perspective view of the reflecting mirror and the irradiation pattern, and (b) is a graph showing the illuminance distribution in the circumferential direction. ■-Reflector 2-Microreflector Applicant Matsushita Electric Works Co., Ltd.

Claims (1)

[Claims] (1) In a reflector for a lighting device, which has a substantially bowl-shaped reflector that is open upwardly and downwardly and has a large number of minute reflectors having a rectangular or tortoiseshell outline on at least the inner surface thereof, the minute reflector of the reflector is , with respect to the circumferential direction of the reflecting mirror, the centers of adjacent minute reflecting parts viewed from the center are arranged concentrically so that all angles in the circumferential direction are equal, and the center of the reflecting mirror is With respect to the cross-sectional direction including the axis, staggered so that the angle formed between the centers of adjacent minute reflection parts is 1/2 of the angle made in the circumferential direction between the centers of the minute reflection parts adjacent in the circumferential direction. A reflector for lighting equipment characterized by being arranged in a shape.