JP2002231024A - Lighting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a lighting without unevenness with which emergence of shade is prevented by controlling the light from multiple light sources such as fluorescent lamp. SOLUTION: It is composed of an umbrella-shaped reflecting plate 1 which covers a plurality of rod-like fluorescent lamps F. At the front part of the inner face of the reflecting plate 1, a helical and continuous strip-shaped convex part 3 is formed around the light axis X and with that convex part 3 the light from the plurality of fluorescent lamps F is turned askew to the light axis X and eliminates the shaded part generated by the fluorescent lamps F by surrounding it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting apparatus for reflecting and radiating light emitted from a light source such as a fluorescent lamp, an incandescent lamp, and a discharge tube.

[0002]

2. Description of the Related Art As shown in FIG. 6, a fluorescent lamp 52 and a reflecting plate 53 are arranged on a lamp body 51, and a lamp body 51 is attached to the other end of an arm 54 having one end attached to a mounting surface such as a ceiling C.
Are connected. The lamp body 51 has an opening window 51a on the front surface, and emits light from the fluorescent lamp 52 through the opening window 51a. The fluorescent lamps 52 are rod-shaped, and are arranged in the lamp body 51 in the order of two to six.

The reflecting plate 53 is a concave mirror formed in a bowl shape around a light emitting portion of the fluorescent lamp 52, and is used to reflect and radiate light emitted from the plurality of fluorescent lamps 52. is there. However, in the case of a lighting apparatus in which a plurality of fluorescent lamps 52 are arranged as described above, the light from each of the fluorescent lamps 52 reflected by the reflection plate 53 is separated from each other by the fluorescent lamps 5.
2 makes it easy for shadows to appear, and as a result, the light emitted from the lighting equipment becomes uneven.

Conventionally, in order to prevent this, as shown in FIG. 7A, an auxiliary reflecting mirror 55 having a shape conforming to the shape of the fluorescent lamp 52 is added to the reflecting plate 53, and FIGS. )
As shown in the figure, a horizontal groove 56 and a vertical groove 57 are provided on the inner surface of the reflection plate 53, respectively. FIG. 8A shows the details of the reflector 53 provided with the lateral groove 56 shown in FIG. 7B, and FIG. 8B shows the state of light distribution control at this time. As shown in FIG. 8A, the light from the fluorescent lamp 52 is reflected and diffused by a lateral groove 56 provided on the inner surface of the reflector 53. The lateral groove 56 is intended to prevent the generation of a shadow due to the diffusion.

[0005]

However, FIG. 8 (b)
As shown in FIG. 7, even when the lateral groove 56 is provided on the inner surface of the reflection plate 53, the lateral groove 56 is formed uniformly on a circumference perpendicular to the light extraction direction (downward in FIG. , The light is reflected only in a certain direction and
Cannot be completely surrounded and erased. FIG.
The same applies to the vertical groove 57 shown in FIG.

In the case of the auxiliary reflector 55 shown in FIG. 7 (a), light can be diffused to some extent by adjusting the mounting angle thereof, but light can be reflected only in some directions. Therefore, light distribution control cannot be performed completely. Further, the added auxiliary reflection plate 55
Therefore, the number of parts is increased by this amount, which leads to an increase in manufacturing costs such as material costs and man-hours for assembly, and makes it impossible to realize an inexpensive lighting device.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lighting apparatus which controls light emitted from a plurality of light sources such as fluorescent lamps to prevent shadows from occurring and to provide uniform illumination. I do.

[0008]

A lighting device according to the present invention is a lighting device comprising an umbrella-shaped reflecting plate for covering a light source. Is provided. The light radiated from the light source is diffused so as to be obliquely wrapped around by the band-shaped auxiliary reflection portion that is oblique to the light extraction direction provided on the inner surface of the reflection plate, and thus surrounds a portion that has conventionally caused a shadow. Then, the shadow can be removed.

[0009] Here, it is desirable that the auxiliary reflecting plate is a spiral convex. Thereby, the light emitted from the light source is diffused so as to continuously and diagonally circulate obliquely by a spiral convex portion which is obliquely continuous with respect to the light extraction direction, so that it is possible to further remove the shadow. Become.

Here, since the convex portion of the reflector can be formed integrally with the reflector, it is possible to reduce the number of parts and the production cost. Further, the reflection plate can be made of metal or resin, and the convex portion according to the present invention can be easily formed by a mold or the like.

[0011]

FIG. 1 is a perspective view of a lighting apparatus according to an embodiment of the present invention, FIG. 2 is a sectional view of the lighting apparatus of FIG. 1 taken along an optical axis, and FIG. It is.

In FIG. 1, an illuminating device according to an embodiment of the present invention comprises an umbrella-shaped reflector 1 covering a plurality of rod-shaped fluorescent lamps F as light sources, and reflects light emitted from the plurality of fluorescent lamps F. The light is reflected by the inner surface of the plate 1 and is distributed over a wide range with the center of the front opening 2 as the light extraction direction (optical axis) X. Further, a continuous band-shaped convex portion 3 spirally formed around an optical axis X as an auxiliary reflecting portion for reflecting and diffusing light from the fluorescent lamp F is formed in front of the inner surface of the reflecting plate 1. ing.

The projection 3 in the present embodiment has a width of 5 mm and a width of 5 mm with respect to the reflector 1 having a diameter of 136 mm of the opening 2.
The angle of inclination from the helical optical axis is 10 °, and four ridges are formed around the optical axis X at 90 ° intervals. Convex part 3
When press forming the reflector 1 from a stainless steel plate,
It is molded simultaneously with a mold.

As described above, according to the helical convex portion 3 continuous in the oblique direction with respect to the optical axis X, as shown in FIG. The light is reflected and diffused obliquely around it. That is, the light from the plurality of fluorescent lamps F can be obliquely wrapped around the optical axis X by the helical projections 3 to surround and remove the shaded portions generated by the lights of the fluorescent lamps F.

Here, the luminous intensity distribution by the reflector 1 in this embodiment and the conventional reflector 53 will be described with reference to FIG. FIG. 4A is a diagram illustrating the luminous intensity distribution of the reflector 1 in the present embodiment, and FIG. 4B is a diagram illustrating the luminous intensity distribution of the conventional reflector 53.

As shown in FIG. 1B, the conventional reflector 5
In 3, the light intensity distribution of the reflection plate 53 in the light extraction direction (downward in the figure) has a depression. This depression is
This is a shaded portion caused by the plurality of fluorescent lamps F in the reflection plate 53, and the illumination is uneven. On the other hand, as shown in FIG. 2A, the luminous intensity distribution in the case of the reflector 1 in the present embodiment is smooth in any direction,
It can be seen that the occurrence of shading is prevented and illumination without unevenness is obtained.

As described above, in the lighting device according to the present embodiment, the light emitted from the plurality of fluorescent lamps F
Is continuously reflected and diffused obliquely with respect to the optical axis X by the continuous helical projections 3 provided on the inner surface thereof, and is sent to a portion where a shadow is conventionally generated, thereby preventing the generation of a shadow. Further, since the convex portion of the reflecting plate 1 is formed integrally with the reflecting plate 1, the number of parts is reduced, the manufacturing cost is reduced, and an inexpensive lighting fixture can be realized.

In the lighting device according to the present embodiment,
Since the convex portion 3 is formed as a continuous spiral around the optical axis and the light from the light source X can be continuously and uniformly diffused around the optical axis X, various shapes other than the rod-shaped fluorescent lamp F can be used. It is also effective for light sources.

In this embodiment, the reflection plate 1 is described as being conical as shown in the figure, but may be formed in another shape such as a pyramid. In addition, the convex portion 3 may be a concave portion, and the auxiliary reflecting portion according to the present invention may have the optical axis
Other shapes may be used as long as they are asymmetrical and continuous with respect to the center.

FIG. 5 shows another example of the auxiliary reflection section.
The reflecting plate 1a shown in FIG. 5 includes a band-shaped convex portion 3a formed obliquely to the optical axis X as an auxiliary reflecting portion. Convex part 3
“a” is formed such that the width of the band is 5 mm and the inclination angle from the optical axis X is 10 ° with respect to the reflection plate 1a having a diameter of 136 mm of the opening 2a. Also in such a convex portion 3a, the light emitted from the plurality of fluorescent lamps F is reflected and diffused so as to go obliquely with respect to the optical axis X, and a shadow portion generated by the light of the fluorescent lamps F is formed. It can be surrounded and removed.

[0021]

According to the present invention, the following effects can be obtained.

(1) By arranging a band-shaped auxiliary reflection portion continuous in a diagonal direction to the light extraction direction on the inner surface of the reflection plate, the light radiated from the light source is diffused so as to go obliquely, and a shadow This prevents occurrence and enables illumination without unevenness.

(2) By forming the belt-like convex portion in a spiral shape, the light from the light source is diffused so as to continuously go around obliquely, further preventing the generation of shadows and enabling uniform illumination. Becomes

(3) By forming the projection integrally with the reflector, the number of parts can be reduced, the manufacturing cost can be reduced, and an inexpensive lighting fixture can be realized.

[Brief description of the drawings]

FIG. 1 is a perspective view of a lighting device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the lighting apparatus of FIG. 1 cut along an optical axis.

FIG. 3 is a detailed view of a part A in FIG. 2;

FIG. 4A is a diagram illustrating a luminous intensity distribution of a reflector in the present embodiment, and FIG. 4B is a diagram illustrating a luminous intensity distribution of a conventional reflector.

FIG. 5 is a diagram showing another example of the auxiliary reflection unit according to the embodiment of the present invention.

FIG. 6 is a diagram showing an example of a conventional lighting fixture.

FIG. 7 is a diagram showing an example of a conventional auxiliary reflecting mirror and the like.

8A and 8B are examples of conventional light distribution control, in which FIG. 8A is a cross-sectional view of a reflector, and FIG.

[Explanation of symbols]

 1, 1a Reflector 2, 2a Opening 3, 3a Convex

Claims (3)

[Claims] 1. An illuminating device comprising an umbrella-shaped reflector for covering a light source, wherein a belt-like auxiliary reflector is provided on an inner surface of the reflector in a direction oblique to a light extraction direction. lighting equipment. 2. The lighting apparatus according to claim 1, wherein the auxiliary reflecting section is a spiral convex. 3. The lighting apparatus according to claim 1, wherein the auxiliary reflection section is integrated with the reflection plate.