JPH02236996A - Lighting fitting for multiple lamp - Google Patents

Abstract

PURPOSE:To achieve light adjustment for whole lamp different in the degree of light adjustment, and to achieve lighting accompanied by fine view and comfortableness by placing a predetermined means of light adjustment of a certain degree of light adjustment, in parallel for each lamp, and by preferentially using this. CONSTITUTION:Light adjustment means 14a-14d of predetermined degrees of light adjustment are connected in parallel with lamps of not less than three, or with lamps 2a-2d. Each lamp is energized by oscillation power of an inverter 5, and is driven in either mode of whole light burning or of light adjustment burning, a relay 15K, by which each lamp is actuated at a predetermined preferential mode according to the actuation of a multistep switch 18. In a light adjustment mode, fine view is retained for each lamp without its being put out, and the generation of uncomfortableness can be prevented by employing a predetermined mode, for example, by setting luminous intensity of at least one lamp lower than the other lamp.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a multi-light lighting fixture having a dimming function for lighting three or more discharge lamps. (Prior Art) Examples of lighting equipment that lights up a plurality of discharge lamps such as fluorescent lamps include chandeliers and lighting equipment that are equipped with three or four straight tube fluorescent lamps of about 20 W. FIG. 4 is a perspective view showing the appearance of such a general lighting fixture equipped with four discharge lamps, in which four discharge lamps 21 to 2d are arranged in parallel in the fixture body 1. There is. Conventionally, in such lighting equipment, a lighting device is provided for each discharge lamp, and each discharge lamp 2. ~2d lighting is controlled. For example, the first stage of the changeover switch turns on all lights (all four lights are on), the second stage turns on only the two central lights as shown in Figure 5, and the third stage turns off the lights. Therefore, when dimming, some of the discharge lamps are turned off.

On the other hand, lighting equipment is also known that uses an inverter that generates a high-frequency voltage as a lighting device to perform dimming control of each discharge lamp. Figure 6 shows, for example, JP-A-57-
FIG. 1 is a circuit diagram of a conventional multi-light lighting fixture of this type shown in Publication No. 13605. In the figure, 3 is an AC power supply, 4 is a rectifier circuit that converts the AC into DC, 5 is an inverter that generates a high frequency voltage, and here a pair of transistors 6
a. It is configured as a push-pull type transistor inverter using 6b. 7 is a constant current control coil;
8a, 8b are starting resistors, 9 is a resonance capacitor, 10
is an output transformer of the inverter 5, which has a primary winding 1l, a secondary winding 1i112, and a feedback winding 13. 14 is a dimming means consisting of an inductor, 15 is a dimming switch, 1
6 is a balancer, and 17a to 17d are filament transformers of each of the discharge lamps 2a to 2d.

In the illuminator No. 1 constructed as described above, when the dimmer switch 15 is closed, the state becomes full light, and when the dimmer switch 15 is opened, the inductor of the 1,000 dimmer stage 14 is inserted into the lighting circuit. The light is dimmed.

In this dimming state, the current flowing through each of the discharge lamps 2a to 2d is reduced by the inductor, and the discharge lamps 2a to 2d are in a dimming state. At this time, due to the action of the balancer 16,
Approximately equal discharge currents flow through the four discharge lamps 2a to 2d,
The brightness will be approximately the same. In this way, each discharge lamp 2a to 2d
The system dims the light uniformly as a whole without turning off the lights.

(Problem to be Solved by the Invention) Conventional multi-light lighting fixtures have deteriorated as described above, so when turning off the discharge lamps in the - section when dimming the light, it is difficult to disturb the aesthetics or cause discomfort. Furthermore, even when each discharge lamp is dimmed uniformly, there is a problem in that the overall appearance of the discharge lamp is dark.

This invention was made in order to solve the above problems, and it does not spoil the aesthetic appearance or cause discomfort.
It is also an object of the present invention to obtain a multi-light lighting fixture with a bright appearance using the same amount of human power.

[Means to solve the problem]

A multi-lamp lighting fixture according to the present invention includes three or more dimmable discharge lamps, and when dimming, dims each discharge lamp without turning off the light, and adjusts the dimming degree of at least 1 discharge lamps to another level. It is designed to be lower than other discharge lamps.

(Function) In the multi-light lighting fixture of the present invention, each discharge lamp is dimmed without being extinguished during dimming, and some of the discharge lamps are dimmed to a lower level than the multiple lights, so the same amount of power is used. However, the exterior looks bright.

(Embodiment) Fig. 1 is a circuit diagram of a lighting device for a multi-lamp lighting device according to an embodiment of the present invention, and the same reference numerals as in the conventional Fig. 6 indicate the same constituent parts. ~2d is a dimmable discharge lamp such as a fluorescent lamp, 3 is an AC power supply, 4 is a rectifier circuit, 5 is an inverter, 6a and 6b are a pair of transistors, 7 is a constant current i'tllI control coil, 8a and 8b are Starting resistor, 9 is resonance capacitor, 10 is inverter 5
The output transformers 11, 12, and 13 are the primary winding, secondary winding, and feedback winding of the output transformer 10, respectively, and 14a to
14d is a dimming means consisting of an inductor for setting the dimming level of each of the discharge lamps 2a to 2d, and 15K is a relay for switching between full-light lighting and dimming (dimming) lighting, which has four contacts 15a to 2d. 15d are the light control means 14a to 14d, respectively.
is inserted in parallel with. 16a to 16d are each discharge lamp 2
The impedance element l8 is used to set the current values of a to 2d, and is a multi-stage switch that doubles as a power switch and a dimming switch.Here, it is assumed to be a two-stage switch, and the contact is switched to the side of the dashed arrow in the figure. Possibly the above relay 32K
It is designed to turn on/off. This switch 1
8, the first stage is full light, the second stage is dimmed, the third stage is a light bulb, and the fourth stage is completely off.

Although not shown, it is assumed that the electrodes of each of the discharge lamps 2a to 2d are preheated as necessary, for example, by a preheating winding provided in the output transformer 10.

In the lighting equipment configured as described above, AC power #i
3 is turned on, a DC voltage is generated from the rectifier circuit 4 and input to the inverter 5. As is well known, the inverter 5 self-oscillates due to the action of the feedback winding 13 and generates a high frequency voltage in the output transformer 10. And this high frequency 7'
The waste discharge lamps 2a to 2d are turned on by the pressure. At this time, if relay 15K is energized, its contacts 15a to 15
d is closed, and each discharge lamp 2a to 2d is lit by a discharge current set by each impedance element 16a to 16d. This state is referred to as a full-light state. next,
When the switch 18 is switched to stop the excitation of the relay 15K, its contacts 15a and N15d open, and each discharge lamp 2a
-2d, the light control means 14a to 14d are connected in series. Here, each light control means 14a to 1
If the values of the inductances 4d are not the same but different values, the discharge lamps 2a to 2d are lit at different dimming degrees instead of the same dimming level in this dimming state. For example, if the discharge lamps 2a and 2d on both sides are set to have a shallower dimming level (brighter) than the discharge lamps 2b and 20 in the center,
The central discharge lamps 2b and 20 shown in Figure 2 have deep dimming levels (
Even though it is dark), when viewed from the outside of the instrument body 1, it looks like the one shown in Figure 3, and the shade of the instrument body 1! a
Due to the presence of the discharge lamps 2a and 2d on both sides, the brightness is approximately uniform, giving a bright appearance. Therefore, compared to the conventional dimming-like frame in which two discharge lamps are turned off, the aesthetic appearance and design are not spoiled, and the lamp does not cause discomfort. In this way, when there is a shade 1a on the wooden body 1 of the vessel A, the above-described light control is particularly suitable. Further, although the number of discharge lamps having different dimming degrees is two in the explanation in Section 3, it may be i lamp or more.

In the above explanation, one inverter lights up four discharge lamps (plurality), but one inverter lights one discharge lamp, and by providing multiple devices, each The power of the inverter may not be the same, but may be set so that at least one inverter can be changed (lower the degree of dimming). Further, the dimming means is not by inserting an impedance element as in the embodiment, but by changing the output frequency of an inverter or by other means, and switching between golden light and dimming state is also possible by the switch 18. There is no limitation to the method of operating the relay 15K. Furthermore, it is better to place discharge lamps with deeper dimming levels inside the appliance body 1 than discharge lamps with shallower dimming levels.
＜, Suitable for aesthetic reasons when the light is dimmed.

Although the explanation has been made assuming that there are four discharge lamps, in the case of three or more lamps, five lamps or the like may be used. Further, although it is preferable that the discharge lamps are arranged in a plane, it is also possible to arrange the discharge lamps in a plane, even if they are slightly deviated from the plane, for example, in a case of three lamps, one lamp in the center may be arranged either high or low.

〔Effect of the invention〕

As described above, according to the present invention, at least one discharge lamp is dimmed to a lower level than other lamps during dimming, so it is possible to do so without spoiling the aesthetic appearance or causing discomfort. This has the effect of making the exterior appear brighter with the same amount of human power.

[Brief explanation of drawings]

1 to 3 are circuit diagrams showing one embodiment of the present invention, in which FIG. 1 is a circuit diagram of a lighting device, FIGS. 2 and 3 are explanatory diagrams showing states during dimming, and FIG. FIG. 5 is a perspective view showing the appearance of a general multi-lamp lighting fixture, FIG. 5 is an explanatory diagram showing a conventional dimming state, and FIG. 6 is a circuit diagram showing a conventional example using an inverter. 2a to 2d - Discharge lamps 14a to 14d - Light control means In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] In multi-lamp lighting equipment equipped with three or more dimmable discharge lamps, when dimming, each discharge lamp is dimmed without turning off, and at least one discharge lamp is dimmed more than the other discharge lamps. This is a multi-light lighting fixture that is characterized by a low light intensity.