JPS60101801A - Illuminator for multiple lamps - 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 multi-lamp lighting fixture with good fixture efficiency, in which a plurality of annular fluorescent lamps are lit with different luminous flux ratios.

[Prior art]

BACKGROUND ART Conventionally, as this type of multi-lamp lighting fixture, there has been one shown in the cross-sectional view of FIG. 1 and the circuit diagram of FIG. 2. In these figures, 1 is a hanging cord, and 2 is a lighting fixture body containing a lighting device and the like, which is suspended and supported by the cord 1. Reference numeral 3 denotes a shade, which is disposed in the luminaire main body 2, and has a large-diameter annular fluorescent lamp 4 and a small-diameter annular fluorescent lamp 5 arranged concentrically and close to each other in the same plane.

As shown in FIG. 2, the lighting fixture main body 2 is connected in series to the lamps 4 and 5 via a changeover switch 7 connected to an AC power source 6 and the switch 7, respectively, to provide a rating for the lamps 4 and 5. It consists of choke coils 9, 10, glow lamps 11, 12, etc., which serve as ballasts that turn on depending on the value. In addition.

80a and 80b are movable contacts of the switch 7.

81a and 82a operate in conjunction with each other, and 81a and 82a are the lamps 5 and 8.
2b and 83b are fixed contacts for turning off the lamp 4.

In the lighting fixture configured in this way, first, the changeover switch 7
The movable contacts 80a and 80b are contacts 81a and 81, respectively.
When the alternating current power supply 6 is turned on while the switch is switched to B, current flows through the choke coils 9 and 1o and the four lamps 11 and 12, and the choke coils 9 and 11 operate and the choke High voltage is introduced into the coil 9.10, and the lamp 4,
5 lights up. Next, contacts 80a and 80b of switch 7
are connected to the contacts 82a and 82b, respectively, the lamp 4 goes out and only the lamp 5 lights up. In these lighting states, each of the lamps 4 and 5 consumes the rated power and generates the rated luminous flux.

Incidentally, the luminous flux generated per unit lamp power of an annular fluorescent lamp, that is, the luminous efficiency, increases as the outer diameter becomes larger, as shown in the following table.

In such conventional lighting equipment, the small lamp 5 with low luminous efficiency consumes its rated power in the same way as the large lamp 4 with high luminous efficiency, and the light emitted by the small lamp 5 inside is This has the disadvantage that the large outer lamp 4 acts as an obstacle, making it difficult to irradiate the lighting fixture effectively in the lateral direction, and that the efficiency of the lighting fixture as a whole is low.

[Summary of the invention]

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional technology, and among a plurality of annular fluorescent lamps arranged concentrically close to each other, the lamp with the largest outer diameter is turned on at a brightness increase rate higher than the rated luminous flux value. On the other hand, it is an object of the present invention to provide a multi-lamp lighting fixture with high fixture efficiency by configuring the remaining lamps so that the ratio of the set luminous flux value to the rated luminous flux value is less than the above-mentioned brightness increase rate.

[Embodiments of the invention]

Examples of the present invention will be described below. FIG. 3 is a circuit diagram showing an embodiment of the present invention, in which the same or corresponding parts as in the conventional example are given the same reference numerals and the explanation thereof will be omitted. In this figure, 13 is a high frequency power supply device, and 14 is a rectifier circuit that performs full-wave rectification, and includes a smoothing circuit if necessary. 15
is an inverter that converts DC power to high frequency power, 15A
, 15B is a pair of transistors, 15C is a high frequency choke coil, 15D and 15E are pace resistors, 15F is a resonant capacitor, and 15G is an output transformer, which is a leakage transformer here. 15H is the feedback winding, 15
, 15J is a primary winding, 15I is a secondary winding, 16 is a shunt having input taps 16F, 16F, windings 16C, 16D wound with the same polarity, and output terminals 16A, 16B; 17 is the current limiting choke, 18 is the changeover switch 18
A.

18B are all-light and dimming contacts, respectively. Although not shown in this figure, the electrodes of the lamps 4 and 5 are preheated, if necessary, by a preheating winding provided on the output transformer 15G, for example. Furthermore, the lamps 4 and 5 are
The lamps 4 and 5 are arranged in the same manner as shown in the figure.
For example, the case of annular fluorescent lamps 40W and 32W will be explained.

In the device configured as described above, when the AC power supply 6 is turned on, the inverter 15 is turned on by the action of the return winding 15H to turn on the transistor 15A as is well known.

15B alternately opens and closes to generate a sinusoidal high frequency voltage in the output transformer 15G. At this time, the resonant capacitor 15
F forms a resonance circuit with the winding inductance of the output transformer 15G, and controls the frequency of the inverter 15. At this time, if the changeover switch 18 is connected to the all-optical contact 18A, a lamp with a low starting voltage, for example, the 32W lamp 5, is lit by the high frequency voltage. The voltage generated in the winding 16D by the discharge current of the lamp 5 is stepped up according to the turns ratio with the winding 16C, and is applied to the 40W lamp 4 to light it. Further, at this time, the output current of the secondary winding 15I is shunted in inverse proportion to the turns ratio of the windings 16C and 16D of the shunt 16 to become lamp currents of the respective lamps 4 and 5. Since these lamps 4 and 5 have the same lamp current rating, the output current of the secondary winding 15I is set to twice the rated current of the lamps 4 and 5, and the number of turns of the winding 16C is set to be the same as the number of turns of the winding 16D. If the lamp current of the 40W lamp 4 is decreased, the lamp current of the 40W lamp 4 will increase more than the rated value, and the luminous flux will increase by a brightness increase rate (set luminous flux value/
rated luminous flux value). On the other hand, the current of the lamp 5 decreases beyond its rated value, and the luminous flux also decreases, resulting in dimming lighting.

In this way, the efficiency of the appliance can be improved by reducing the power of the 32W lamp 5, which has a low luminous efficiency, and increasing the power of the 40W lamp 4, which has a high luminous efficiency.

Furthermore, by setting the total value of the set luminous flux values of the lamps 4 and 5 that have been brightened and dimmed to be equal to the sum of the rated luminous flux values of the two lamps 4 and 5, the illuminance of the illuminated surface can be efficiently increased with approximately the same electric power. I can do it.

When the changeover switch 18 is connected to the dimming contact 18B, the number of turns of the winding 16C is further reduced to further increase the lamp current of the lamp 4, but the current limiting choke 17
By setting the values appropriately, it is possible to obtain the same lamp current and luminous flux values as in the above-mentioned full-light lighting mode. -1 volume 1i! 1
The number of turns of the lamp 6D is increased, and the output current of the secondary winding 15I is also reduced by the current limiting choke 17, so that the lamp current of the lamp 5 is further reduced, and the dimming degree becomes deeper. In this case, as in the case of full-light lighting, the reduction in illuminance on the illuminated surface is smaller than the rate of reduction in the sum of the rated luminous fluxes of the two lamps, and the efficiency of the fixture can be increased. Also, the luminous flux value of the lamp 4 during dim lighting does not necessarily have to be the same as when the lamp is lit at full brightness, but the same can be achieved by appropriately increasing the rated luminous flux value using the current limiting choke 17 and the input tap 16g. There is an effect.

Furthermore, in all-light lighting with all-light contact 18A connected,
The lamp 5 does not necessarily have to be lit at a dimming rate below the rated luminous flux, and even if the brightness increase rate is lower than that of the lamp 4, the same effect can be achieved.

In the above embodiment, the two fluorescent lamps in the lighting fixture were arranged on the same plane as shown in FIG.
In some cases, such as a combination of 20W and 30W fluorescent lamps, it is not possible to arrange them on the same plane.In this case, we tried an example in which small lamps were arranged either above or below, but if the distance between the lamps was 10cIIL or less, A similar effect was obtained.

Further, in the above-mentioned embodiment, a case has been described in which the lamp is lit with a high frequency voltage, but the lamp is not limited to this, for example, as shown in FIG. The same effect can be obtained when the lamp is lit at a high frequency, but since the luminous efficiency of the lamp improves when the lamp is lit at a high frequency, the lamp current is less than that for commercial lighting even when the brightness is turned on. If the brightness is less than about 150% of what it would be when the lamp is lit, the effect of enhanced lighting on the lamp life will be small.

In addition, when brightness is increased by high-frequency lighting, the decrease in luminous efficiency is smaller than when brightness is increased by commercial frequency, as previously announced by the present inventors (Proceedings of the National Conference of the Illuminating Engineering Society of Japan in 1978, p. 27). There is also an advantage.

Furthermore, if the sum of the luminous flux of the two lamps during dimming lighting is not large,
The brightness increase rate of the lamp 4 is increased to generate a predetermined luminous flux, and the lamp 5 is turned off by, for example, providing a contact that short-circuits the lamp 5 when dimmed and turned on in conjunction with the changeover switch 17 shown in FIG. By doing so, even more efficient and diverse lighting is possible.

The difference in lamp brightness caused by increasing or dimming the lamps 4 and 5 is that the inner lamp 5 is different from the outer lamp 4.
Because the brightness of the outside lamp 4 is high, it cannot be distinguished from outside the shade 3, and because the brightness of the outer lamp 4 is high, the shade 3
The design is clear and the appearance is improved.

Note that the circuit for lighting the lamps 4 and 5 at high frequency is not limited to that in the embodiment, and may be any circuit as long as it can light the lamp 5 in an increased brightness state. Furthermore, although the number of fluorescent lamps is limited to two, similar effects can be obtained with three or more fluorescent lamps.

〔Effect of the invention〕

As explained above, according to the present invention, the largest annular fluorescent lamp is lit with a brightness increase rate higher than the rated luminous flux, and the ratio of the set luminous flux value to the rated luminous flux value of the remaining fluorescent lamps becomes less than the brightness increase rate. This configuration has the effect of improving the efficiency of the lighting equipment.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a general lighting fixture for multiple lights, FIG. 2 is a circuit diagram of the lighting fixture for multiple lights, and FIG. 3 is a circuit diagram of a fixture for multiple lights according to an embodiment of the present invention. . 2...Lighting equipment body, 3...Sade, 4, 5...
Annular fluorescent lamp, 9.10...Choke coil, 13
... High frequency power supply device, 15 ... Inverter, 16.
... Shunt switch, 18... Selector switch. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Masuo Oiwa Procedural amendment (voluntary) 20 Name of the invention: Multi-light lighting fixture 3, Representative of the person making the amendment: Hitoshi Katayama Section 5, Detailed explanation of the invention in the specification subject to amendment 6, "Lamp 5" on page 10, line 17 of the detailed statement of amendment is corrected to "1 lamp 4."

Claims (3)

[Claims] (1) In a multi-lamp lighting fixture in which a plurality of annular fluorescent lamps with different outer diameters are concentrically arranged in close proximity, the rating of the largest annular fluorescent lamp with the largest outer diameter among the plurality of annular fluorescent lamps is 1. A multi-lamp lighting fixture, characterized in that it is turned on at a brightness increase rate that is greater than or equal to the luminous flux value, and that the ratio of the set luminous flux value to the rated luminous flux value of the remaining annular fluorescent lamps is less than the brightness increase rate. (2) A system according to claim 1, characterized in that the sum of the set luminous flux values of the all-annular fluorescent lamps is set to be approximately equal to the sum of the rated luminous flux values of the all-annular fluorescent lamps. Lighting equipment for lights. (3) A multi-light lighting fixture according to claim 1 or 2, characterized in that at least the largest annular lamp is lit at high frequency.