JPH0235401B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a lighting fixture equipped with three types of annular lamps having different diameters.

[Technical landscape of invention and its problems]

FIG. 2 shows the conventional structure of this type of lighting equipment, in which a is a chassis, a reflector b is attached to the lower surface of the chassis a, and three types of different diameters are attached to the lower surface of the reflector b, ie, for example, An annular lamp c1 with a maximum diameter of 40W, an annular lamp c2 with an intermediate diameter of 32W, and an annular lamp c3 with a minimum diameter with an output of 30W are arranged. In the state shown in FIG. 2a, the annular lamps c1, c2, and c3 are arranged stepwise in three upper and lower layers, and in the state shown in FIG. 2b, they are arranged concentrically on the same plane. In a lighting fixture with such a configuration, each annular lamp c
1, c2, c3 are all turned on, one of them is turned off and the other two are turned on, and all annular lamps c1, c2,
The device can be used by appropriately switching between turning off the c3 and turning on only the night light (not shown).

However, as shown in a, the annular lamps c1, c
2 and c3 are arranged in stages, for example, when the ring-shaped lamp c3 with the smallest diameter or the ring-shaped lamp c2 with the intermediate diameter is turned off, the ring-shaped lamps c3 and c2 in the unlit state are arranged above it. Not only does it block the illumination light of the annular lamps c2 and c3, which reduces the illumination effect on the floor, but also the unlit annular lamps c3 and c2 come directly into the user's field of view, creating an unsightly appearance. If the annular lamp c1 with the highest output is turned off, the illuminance will decrease too much. Furthermore, each annular lamp c1, c2, c3 is arranged in stages,
The overall height of lighting equipment has increased and it has become larger.
This causes inconvenience in handling such as transportation, and the annular lamp c1 on the top layer is far away from the floor, which reduces the efficiency in terms of illuminance.

On the other hand, when each of c1, c2, c3 is arranged concentrically on the same plane as shown in b, the overall height of the lighting fixture can be kept low, and each annular lamp c1, c2, c3 Since the distance between the lamps and the floor can be kept constant, it is possible to avoid a decrease in efficiency in terms of illuminance.However, since each ring lamp c1, c2, and c3 overlap on the same plane, This is particularly problematic when the lighting fixtures are suspended from the ceiling.
Further, since the annular lamps c1, c2, and c3 are adjacent to each other and overlapped, there is a problem in that it is troublesome to attach and detach them when replacing them.

[Purpose of the invention]

This invention was made with attention to these points, and its purpose is to be able to effectively illuminate the floor and surrounding areas, maintain a good appearance, and To provide a lighting fixture whose height can be kept as low as possible to achieve miniaturization, and whose annular lamp can be easily and efficiently attached and detached when replacing it.

[Summary of the invention]

That is, the present invention has three types of annular lamps each having a different diameter, that is, a maximum diameter, an intermediate diameter, and a minimum diameter. An annular lamp of the same diameter is arranged horizontally above the annular lamps of the largest diameter and the smallest diameter and in a portion facing each other in the middle.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

In the figure, reference numeral 1 denotes a chassis suspended from the ceiling or the like via a power cord 2. Inside the chassis 1, although not shown, a lighting ballast and control parts are housed. A reflector plate 3 is attached to the lower surface of the chassis 1, and an output signal, for example, is attached to the lower surface side of the reflector plate 3.
An annular lamp 4a with a maximum diameter of 40W, an annular lamp 4b with an intermediate diameter of 32W, and an annular lamp 4c with a minimum diameter of 30W are supported via lamp holders 5, respectively.

Here, the maximum diameter and the minimum diameter annular lamp 4
a and 4c are arranged concentrically on the same plane, and an annular lamp 4b having an intermediate diameter is arranged horizontally above the annular lamps 4a and 4c and at a portion facing each other in the middle. Therefore each annular lamp 4
In each cross-sectional portion of a, 4b, and 4c perpendicular to the circumferential direction, these are arranged in a triangular shape.

A cord canopy 6 is provided on the upper surface of the chassis 1. A support tube 7 is attached to the outer periphery of the cord cover 6 via screws 8, and heat radiation holes 9 and a support collar 10 are provided on the circumferential surface of the support tube 7. have. 11
is a shade integrally formed of synthetic resin, and this shade 11 has an opening tube 12 projecting inward at the center of the upper surface, and the lower end edge of this opening tube 12 is connected to the support collar 10 of the support tube 7. The shade 11 abuts the upper surface of the chassis 1 and each annular lamp 4.
It is supported horizontally so as to cover parts a, 4b, and 4c.

The shade 11 is generally molded by blow molding of synthetic resin, but in the case of such a molding method, the thickness of the open tube 12 is usually thinner than other parts, and the strength is reduced. Conventionally, the lower end edge of the open tube 12 is connected to the chassis 1.
However, in such a state, the heat of the chassis 1 is transmitted to the open tube 12, causing early deterioration or deformation. Therefore, if the thickness of the open tube 12 is increased to increase its strength,
Accordingly, due to the nature of blow molding, the wall thickness of the parts other than the open tube 12 becomes unnecessarily thick, which increases material costs and weight.

However, in this embodiment, a support tube 7 is provided on the upper surface of the chassis 1, and a support collar 10 of this support tube 7 is provided.
Since the lower end edge of the open tube 12 is supported through the support tube 7, the influence of heat on the open tube 12 can be suppressed, and the wall thickness of the open tube 12 can be kept thin. Because of the support relationship, the protruding height of the open cylinder 12 can be made short, which has the advantage that the strength of the open cylinder 12 can be increased.

Now, among the annular lamps 4a, 4b, 4c,
When the annular lamp 4b with the intermediate diameter is turned off and the others are turned off, the annular lamp 4b with the maximum diameter and the minimum diameter on the floor surface
It is effectively illuminated by lights a and 4c. In other words, the floor surface can be effectively illuminated without being obstructed by the intermediate diameter annular lamp 4b which is in the off state. The annular lamp 4b in the off state is covered by the other two annular lamps 4a and 4c in the on state, that is, the annular lamps 4a and 4c have a so-called louver effect, and therefore the annular lamp 4b in the off state This makes it difficult for the user to see the user's vision, so the user can maintain a good appearance without looking unsightly.

Since the annular lamps 4a, 4b, and 4c are arranged in two layers, upper and lower, the height of the lighting equipment can be kept lower than in the state shown in Fig. 2a, and therefore the size can be reduced. In addition, the distance between the annular lamp 4b on the top layer and the floor surface can be reduced, so that when the annular lamp 4b is turned on, the light can be effectively irradiated onto the floor surface. Illumination of the surroundings of the luminaire can also be effectively achieved by the annular lamp 4b and the other annular lamp 4a. Furthermore, since the annular lamps 4a, 4b, 4c are arranged in a triangular shape and do not overlap each other as shown in FIG. Attachment and detachment can be carried out easily and efficiently.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to effectively illuminate both the floor surface and the surrounding area, maintain a good appearance, and achieve miniaturization by keeping the height as low as possible. Furthermore, when replacing the annular lamp, the annular lamp can be easily and efficiently attached and detached.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG. 2 is a sectional view showing a conventional technique. 4a, 4b, 4c... annular lamps.

Claims (1)

[Claims] 1.In a device equipped with three types of annular lamps each having a different diameter, that is, a maximum diameter, an intermediate diameter, and a minimum diameter, the annular lamps with the maximum diameter and the minimum diameter are arranged concentrically on the same plane, and the annular lamp with the intermediate diameter is arranged concentrically on the same plane. are arranged horizontally above the annular lamps having the largest diameter and the smallest diameter and facing each other in the middle.