JPH01255199A - Lighting equipment - Google Patents

Abstract

PURPOSE:To obtain a high work-plane illuminance with an identical demand by providing a light increasing means for enlarging the light increasing rate of a round fluorescent lamp most contributing to an illuminance just under a light equipment more than that of other round fluorescent lamp. CONSTITUTION:When the movable contact 8d of a switch 8 is connected to contacts 8b1 and 8b2, operation of a relay 13 closes other contacts 14 and 15. A lamp 4 is lit with almost whole flux at a lower light increasing rate than that in the case that both lamps 4 and 5 are lit at the same rate. Light of the lamp 5 is increased, and an inductance 18 is adjusted in such a way as to provide the same work-plane illuminance of a lighting equipment as that in the case that both lamps 4 and 5 are lit at the same light increasing rate. Therefore, the light increasing rate of the lamp 5 much contributing to an illuminance just under the equipment is remarkably high while that of the lamp 4 nearly contributing thereto is low so that it will do that the total demand of the lamps 4 and 5 is smaller compared with that in the case that both lamps 4 and 5 are set at the same light increasing rate. This allows the same work- plane illuminance to be obtained with a smaller demand than that in the case that two lamps 4 and 5 are set at the same light increasing rate.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a lighting fixture that lights a plurality of circular (ring-shaped) fluorescent lamps.

[Conventional technology]

As an example of conventional lighting equipment of this type,
FIG. 5 shows a cross-sectional side view of the lighting fixture disclosed in Publication No. 4202.

(Structure) In the figure, 1 is the main body of the lighting equipment, 2 is the reflector attached to the bottom surface of the main body 1, 3 is the shade attached to the reflector l, and 415 is a large/small circular fluorescent lamp, respectively. ,
They are arranged concentrically in the horizontal direction with steps in the vertical direction. The lamp 4 has a larger rated power and a larger outer diameter than the lamp 5, and therefore has a larger total luminous flux.The lamp 4 is arranged concentrically close to the reflector plate 2. 6/7 is a ballast for lighting the lamp 415; 8 is a switch for switching/blinking the lamp 415; these lighting devices as a whole are connected to a hanging cord fixed to the main body 1; ! It is usually suspended from the ceiling by a.

(Lighting Circuit) Figure 56 is a diagram showing an example of a conventional lighting circuit for the lighting fixture shown in Figure 5, and Figure 7 (A).

(b) is a voltage waveform diagram for explaining the operation.

In FIG. 6, the ballast 6 and the lamp 4 are connected in series, the other end of the ballast 9r6 is connected to the contact 8a of the switch 8, and the other end of the lamp 4 is connected to one end of the commercial type a9. A glow lamp 4a is connected to the lamp 4 in parallel via a filament.
The tube 7 is connected in series with the lamp 5, the other end of the ballast 7 is connected to the contact 8a2 of the switch 8, and the other end of the lamp 5 is connected to one end of the power source 9 together with the one end of the lamp 4. has been done. A glow lamp 5a is connected in parallel to the lamp 5 via a filament.

The other end of the power source 9 is connected to a contact piece 8d of the switch 8.

11/12 each surrounded by a broken line is each lamp 415
Each dimmer is a dimming means. bidirectional thyristor
la/12a are contacts 8a 2/8b respectively
Further, the connection point between the ballast 7 and the bidirectional thyristor 12a is connected to a contact point 8a2. Since the internal configuration of each dimmer 311/12 is similar, only the dimmer 11 will be described.

The gate of the bidirectional thyristor lla is connected to t' through a series circuit of the bidirectional triggering thyristor flb and the resistor lid.
It is connected to one end of the source 9. A capacitor I is connected between the contact 8a2 and the anode of the bidirectional trigger thyristor ttb.
A series circuit of ff and variable resistor 11e is connected, and a trigger element 11c is connected between the connection point of capacitor llf and variable resistor 11e and the gate of bidirectional trigger thyristor llb. On the other hand, the other end of the cable #i9 is connected to the contact piece 8d of the switch 8, as described above.

(Operation) In the device configured as described above, when the contact piece 8d of the switch 8 is connected to the contacts 8al and 8a2, the power source 9
is applied to the series circuit of lamp 4 and ballast 6 and lamp 5 and ballast 7, and lamps 4 and 5 are fully lit. In addition, when the switch 8 is operated, the contact piece 8d changes to the contacts 8bl and 8b2.
When connected to the dimmer 12, the power source 9 is applied to the dimmer 12 via the contact 8b2. The dimmer 12 includes a bidirectional thyristor 1
2a is the phase θ2 to θ shown in FIG. 7(a). The voltage shown in FIG. 7(A) is applied to the series circuit of the lamp 5 and the ballast 7, and the lamp 5 is dimmed and turned on. On the other hand, dimming 5
11 is applied with the output voltage of the dimmer 12, which is the voltage shown in FIG. The phase θ3 to θ.

Until then, a voltage is applied to the lamp 4. This voltage causes the lamp 4 to be dimmed and turned on.

At this time, since the dimmer 11 controls the phase of the output voltage of the dimmer 12, the conduction start phase θ3 of the 5A dimmer 11 is always delayed from the conduction start phase θ2 of the dimmer 12. Therefore, the output voltage of the dimmer 12 is higher than the output voltage of the dimmer 11, and the dimming rate of the lamp 5 is always smaller than the dimming rate of the lamp 4. Here, the "attenuation rate" is the attenuation value (j!m)/total luminous flux (ffim).

The output voltage of the dimmer 12 is set so that the luminous flux of the lamp 5 is close to full lighting, and the output voltage of the dimmer 11 is
:JA! ! By reducing the luminous flux of lamp 4 so that the working LTn illuminance of the lighting equipment is equal to that of two lamps with the same attenuation rate, the attenuation rate of lamp 5, which greatly contributes to the direct illuminance, will be reduced. , the dimming rate of lamp 4, which does not contribute much, is quite large, so the total power consumption of lamps 4 and 5 is less compared to the case where two lamps have the same dimming rate, and lamp 4 also has a large dimming rate. Since the lights are on, the illuminance on the walls and ceiling is higher than in the conventional example, creating a relatively good viewing environment. In this way, lamp 4
By making a difference in the attenuation rate of the lamp 5 and the lamp 5, it is possible to obtain the same illuminance on the work surface as before with less power consumption, and also to increase the illuminance on the wall and ceiling surfaces, making it possible to create a relatively good viewing environment.

[Problem to be solved by the invention] However, since the conventional lighting equipment was configured as described above, by changing the dimming rate of the lamp when dimming the light, high illuminance on the work surface can be achieved with low power consumption. is obtained, but
There was a problem in that the illuminance on the work surface could not be made higher than when all lights were on.

This invention was made in order to solve the problems of the conventional example as described above, and when setting the work surface illuminance of this type of lighting device to be higher than when the lamp is fully lit, it is possible to improve power efficiency. The purpose is to provide a good circuit configuration.

[Means to solve the problem]

Therefore, the lighting equipment according to the present invention is equipped with an inverter device for lighting a plurality of circular fluorescent lamps arranged in a concentric manner at high frequency, and each lamp is controlled to have a higher rated value than the other lamps. By configuring the system to include a brightness increasing device for setting the power to a large amount, the above objective [J] is attempted to be achieved.

(Function) With the above configuration, the brightness increasing device of the present invention increases the brightness by setting the brightness increase rate of the lamp whose contribution rate of illuminance to the work surface illuminance is high compared to the brightness increase rate of other lamps. Since the illuminance of the work surface can be increased by using a lamp with a high efficiency, a high illuminance of the work surface can be obtained with the same consumed power.

〔Example〕

The present invention will be explained below based on examples. FIG. 1 shows an embodiment of a circuit diagram according to the present invention. In addition, Figures 2 and 3 are respectively explanatory diagrams of the operation in the circuit shown in Figure 1, Figure 2 is a diagram of each switch position vs. lamp power ratio, and Figure 3 is a diagram of lamp power increase rate vs. luminous efficiency characteristics. It is.

(Configuration) In the circuit configuration of FIG. 1, the same (equivalent) components as in FIG. 6 of the conventional example are represented by the same reference numerals, redundant explanations are omitted, and points different from FIG. 6 will be mainly explained. .

Reference numerals 6a and 7a indicate lighting devices for a plurality of circular fluorescent lamps 415, each of which is composed of a transistor inverter, and lights each lamp 415 at a high frequency. Note that each inverter 6 a / 7 a is configured to be able to light the lamp 415 with more power than the rated power. At this time, the ratio of the lamp power to the rated power is such that each inverter 6/7 is set so that the increase rate of the lamp 5 is greater than the increase rate of the lamp 4.

Inductances 17/18 and relay contacts 1 are connected between the output terminals of the bowl inverters 6/7 and the lamp 415, respectively.
4/15 parallel circuits are connected. Each of these inductances 17/18 is connected to a respective relay contact 14/1
The power consumption of each lamp 415 is set so that when the lamp 5 is opened, the power consumption of each lamp 415 reaches its rated value. 16 is a DC circuit for generating the DC voltage required for the operation of each inverter 6/7 from the commercial power supply 9; 13 is a relay connected between the contact 8b2 and one end of the commercial power supply 9; The relay contacts 14/15 are configured to open when voltage is applied. 8 is a changeover switch, which has contacts 8al/8a2, 8bl/8b2, 8c and a movable contact 8d. 9 is a commercial power supply.

(Operation) Next, the operation of the above circuit will be explained. When the movable contact 8d of the switch 8 is connected to the contacts 8a1 and 8a2,
Since the commercial i source 9 is applied to the DC circuit 16, each inverter 6/7 is operated and both lamps 415 are lit at high frequency. At this time, since the relay 13 is not operating, its contacts 14/15 are open. Therefore, since inductance 17/1B is connected between inverter 6/7 and lamp 415, both lamps 415 are lit with rated power.

Next, when the movable contact 9d is connected to each contact 8bl/8b2, the relay 13 is activated and closes each contact 14/15. At this time, as described above, as shown in FIG. 2, the lamp 415 has a larger increase rate with respect to the rated power in the lamp 5 than in the lamp 4. At this time, the lamp 415 is lit at a high frequency by the inverter 6/7, so as shown in FIG. Even when lit with high power, the luminous efficiency decreases little. Therefore,
The brightness increase rate of the lamp 5 is larger than that of the lamp 4. Here, the "brightness increase rate" is the brightness increase value in)/total luminous flux (2 m).

The lamp 4 is turned on with almost the full luminous flux, which is a smaller brightness increase rate than when both lamps 415 are turned on with the same brightness increase rate,
If the inductance 18 is adjusted so that the illuminance of the work surface of the lighting fixture is the same as when both lamps 415 are lit at the same brightness increase rate by increasing the brightness of the lamp 5, the brightness of the lamp 5 will be increased, which is much closer to the illuminance directly below. The ratio is quite large, too close! Since the brightness increase rate of lamp 4 that does not y is small, the total power consumption of lamps 4 and 5 is lower than when both lamps 415 are set to the same brightness increase rate, and lamp 4 is also lit with increased brightness. The illuminance of the walls and ceiling is also increased, providing a relatively good viewing environment.

In this way, by making a difference in the brightness increase rate of each lamp 415, there is less power consumption and less power consumption than when two lamps 415 are set to the same brightness increase rate! The same illuminance on the work surface can be obtained using electric power, and the illuminance on the walls and ceiling is also increased, creating a relatively good viewing environment.

(Other examples) FIG. 4 is a circuit diagram showing another embodiment of the present invention.

In this embodiment, compared to the first embodiment shown in FIG. 1, the output power of the inverter is set to the rated value of the lamp 5, so that only the lamp 4 is lit with increased brightness. This is what I did.

In the above explanation, an example was shown in which inductances 17/18 and relay contacts 14/l5 connected between each lamp 415 and inverter 6/7 were used as means for increasing brightness. The method is not limited to this, and may be a method that changes the impedance of the inverter or a method that changes the input voltage.

Furthermore, it goes without saying that a single inverter may be capable of lighting two lamps.

Furthermore, although the above two embodiments have described the case where two lamps with different rated power and outer diameter dimensions are lit in the same lighting equipment, the present invention is not limited to this, and multiple lamps of three or more lamps are lit in a substantially concentric circle. The same effect can be obtained even if the lights are arranged in a shape and turned on. Further, the lamp arrangement may be such that lamps with different outer diameters are arranged concentrically within the same plane, or furthermore, lamps with the same outer diameter may be arranged one above the other in substantially concentric circles. Of course, it has the same effect.

〔Effect of the invention〕

As explained above, according to the present invention, when a plurality of circular fluorescent lamps arranged concentrically within the same lighting fixture are lit with increased brightness, the fluorescent lamps are lit at high frequency and contribute most to the illuminance directly below the lighting fixture. By setting the brightness increase rate of the lamp to be lower than that of other lamps, the illuminance of the work surface can be set high with less power consumption, and the walls and ceiling can also be illuminated, providing good visibility. Can be in the environment.

[Brief explanation of the drawing]

FIG. 1 is a circuit configuration diagram of a lighting fixture according to one embodiment of the present invention, FIGS. 2 and 3 are respectively explanatory diagrams of the operation of the circuit in FIG. 1, and FIG. 4 is another embodiment of the present invention. FIG. 5 is a cross-sectional side view of an example of a conventional lighting fixture to which the present invention can be applied; FIG. 6 is an example of a circuit diagram of a conventional lighting fixture; FIG. 7 (A); (b) is each voltage waveform diagram for explaining the operation. 415... Each circular fluorescent lamp 6/7... Each inverter 8... Switch 14/15... Each relay contact (brightening means). The same reference numerals indicate the same or equivalent components.

Claims (1)

[Claims] A lighting fixture in which a plurality of circular fluorescent lamps are arranged concentrically and can be lit with a luminous flux larger than the rated luminous flux value of each fluorescent lamp, which is equipped with an inverter device for lighting each of the fluorescent lamps at a high frequency. A lighting fixture further comprising a brightness increasing means for making the brightness increasing rate of the circular fluorescent lamp that contributes most to the illuminance immediately below the luminaire larger than the brightness increasing rate of the other circular fluorescent lamps.