JPS5923402A - 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 having a plurality of annular lamps arranged concentrically in the vertical direction.

[Technical background of the invention and its problems]

Generally, lighting equipment is designed to reflect light emitted from a lamp downward by a reflector. Examples of lighting equipment that uses a reflector to reflect light from a lamp downward include those disclosed in Japanese Unexamined Patent Publication No. 55-113202 and Japanese Utility Model Publication No. 5
There are those described in JP-A No. 5-36564, JP-A-55-104003, and JP-A-56-28404.

However, the devices described in Japanese Unexamined Patent Publication No. 55-113202 and Japanese Utility Model Application No. 55-36564 are for one light, and the former cannot be used for multiple lights due to the shape of the reflector, and the latter However, in this case, the disadvantage is that the light reflected from one lamp is likely to be blocked by the other lamp.

Furthermore, in the one described in JP-A-55-104003, since the reflector is formed of two different curved surfaces,
Manufacturing becomes complicated and the shape becomes large.

Additionally, conventional multi-lamp lighting fixtures are usually designed to allow one lamp to be lit in order to save energy, and in the case of one lamp being lit, the lowest lamp whose light is not blocked by other lamps must be turned on. It is most efficient to use this lamp to illuminate the area directly below the lighting fixture. However, in the devices described in JP-A-55-104003 and JP-A-56-28404, the light from the lamp positioned above is controlled by a reflector, and the area directly below is illuminated by this light. Due to this structure, when one lamp is lit, the area directly below it is not much brighter than the others, which has the disadvantage of poor efficiency.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned drawbacks, and it is an object of the present invention to provide a lighting fixture that is efficient, easy to manufacture, and can increase the illuminance in the direction directly below the lighting fixture, not only when it is normally lit, but especially when a single lamp is lit. be.

[Summary of the invention]

The lighting equipment of the present invention includes a plurality of annular lamps arranged concentrically and spaced apart in the vertical direction, and a rotating lamp 2 that is provided inside these lamps and has a focal point within the lamp located at the bottom.
This structure is characterized by having a curved reflector, and the reflector guides the light from the lamp located at the bottom to illuminate the direction directly below the lighting fixture.

[Embodiments of the invention]

Next, one embodiment of the present invention will be described based on FIGS. 1 to 173.

(1) is the main body of the device, and a shade (2) with an open bottom,
Two annular fluorescent lamps with different ring diameters +31 (4);
It is formed of a reflector (5).

The lamp +3) f4) is supported by a support (not shown) with the lamp (4) having a small ring diameter on the lower side and the lamp (3) having a large ring diameter on the upper side, and is concentrically arranged inside the shade (2). They are spaced apart.

The reflector (5) is located inside the lamp +31 f41 and is formed to protrude downward in a substantially conical shape. The reflective surface (6) of this reflector (5) is formed of a rotational quadratic curved surface consisting of an aluminum mirror surface or an aluminum leather-covered surface, and no matter which plane passes through the axis of rotation, the reflective surface (6) forms a parabola. It has an eggplant shape. The horizontal axis of this parabola and the reflective surface (6
) is perpendicular to the axis of rotation.

The focus of this parabola is the lamp (4) with a small ring diameter.
It is located at the center of the cross section.

Next, the operation of this embodiment will be explained.

From the center of the cross section of the lamp (4) with a small ring diameter to the reflective surface (6)
Since the cross-section of the reflective surface (6) is a parabola, the 5-directed light is reflected vertically downward at the reflective surface (6).

Light from the upper and lower edges of the lamp (4) toward the reflective surface (6) is reflected by the reflective surface (6) K, and is reflected at an angle of 0° with respect to the direction directly below. Therefore, this lamp (4)
The light distribution is as shown in Fig. 2. In this figure, the vertically downward direction of the instrument body (1) is 06.

In addition, the light traveling from the lamp (3) with a large ring diameter to the reflective surface (6) is connected to the light from the center of the cross section of the lamp (4) at the reflective surface (6) at an angle θ, which is the same as the angle θ. It is reflected with .

Next, Table 1 shows the luminous intensity directly below the floor when 32W and 30W are used as the lamp +3) (4) and the fixture body (1) is placed at a position 51.8 cm from the floor. Table 2 shows the illuminance directly below.

Table 1 Table 2 As shown above, when the reflector (5) is provided, the luminous intensity in the direct downward direction increases by 52.0% when one lamp is lit without a shade, and by 18.3% when two lamps are lit with a shade. It will rise. Also,
The illuminance directly below is 21 when two lamps are lit with a shade.
．． This is an increase of 1 inch. In addition, as shown in Figure 3, the illuminance is not only directly below, but also from the reflector (5
) showed a very significant increase compared to those without.

In addition, although the purpose of the above embodiment was to increase the illuminance directly below,
It is also possible to uniformly illuminate a predetermined area with a constant illuminance centered directly below. In this case, as shown in FIG. 4, the reflective surface (6a) of the reflector (5) is formed by a quadratic curved surface of rotation, and no matter which plane passes through the rotation axis, it forms a parabola. The horizontal axis of this parabola is at a predetermined angle θ2, with respect to a line perpendicular to the rotation axis r.
For example, it has a shape having an inclination of 45 degrees.

Therefore, the light from the center of the cross section of the lamp (4) with a small ring diameter located at the focal point of the parabola has an inclination of θ = 90° = 02 = 45° with respect to the direction directly below the reflecting surface (6a) K. The reflected light from the lamp (4) produces a light distribution as shown in FIG.

In this way, the light distribution state from the lamp (4) is adjusted to the fixture body (
1) Since the illuminance is approximately uniform from the direction directly below to an angle of 45 degrees, the illuminance on the floor surface is uniform over a wide range.

In both of the above embodiments, an annular fluorescent lamp +31 (41) having two different ring diameters of 32W and 30W was used, but the present invention is not limited to this.
Lamps with the same ring diameter like W and 30W, 40W and 30
Lamps with greatly different ring diameters like W, 40W and 32W
A similar effect can be obtained by combining three or more lamps such as 30W and 30W.

〔Effect of the invention〕

According to the present invention, since the focal point of the rotating quadratic curved reflector is located inside the annular lamp located at the lowest position, the light directed from the lamp to the reflector is reflected vertically downward by this reflector, and is reflected directly below. The illuminance can be increased. Even when only the lamp located at the bottom is turned on to save power, the illuminance directly below is high due to this lamp, and efficient illumination can be performed.

In addition, by making the reflector a rotating quadratic curved surface with an inclined axis, the light from the lamp located at the bottom toward the reflector is diffused at a predetermined angle with respect to the vertically downward direction, so it is not only diffused vertically downward. , uniform illuminance can be achieved over any range.

Furthermore, since the reflector is formed of a single rotational quadratic curved surface, the structure is simple, and manufacturing and assembly are also easy.
Productivity can be improved.

[Brief explanation of drawings]

Fig. 1 is a plan view showing an embodiment of the lighting device of the present invention, Fig. 2 is the light distribution curve of the above, Fig. 3 is the characteristic showing the relationship between the distance diagram of the above and the illuminance, and Fig. The cross-sectional view showing the embodiment shown in the other figures, and FIG. 315, are the same light distribution curves. (31(4)...ring-shaped lamp, (5) fist/reflector. July 28, 1981 Inventor Fumi Iwasaki Same as Nobuo Matsushita Tokuken Applicant Toshiba Electric Materials Corporation No. 45 6-

Claims (1)

[Claims] fi+ A plurality of annular lamps arranged in a concentric circle spaced apart from each other in the vertical direction, and a rotating quadratic curved reflector having a focal point within the lamp, which is provided inside these lamps and located at the lowest position. A lighting device characterized by comprising: (2) The lighting device according to claim 1, wherein the reflector is formed of a rotating quadratic curved surface with an inclined axis.