JPS59230203A - 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 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.

BACKGROUND ART Conventionally, multi-light lighting equipment has been shown in the cross-sectional view of FIG. 1 and the circuit diagram of FIG. 2.

In the figure, (1) is a hanging cord, and (2) is a lighting fixture body containing a lighting device, etc., which is suspended and supported by the cord (1). (3) The lighting fixture body (2) with a shade
A large annular fluorescent lamp (4) with a circular light distribution is located on the side far from the center of the illuminated surface, that is, above, and a large annular fluorescent lamp (4) is located on the side near the center of the illuminated surface, that is, below. A small annular fluorescent lamp (5) is installed.

The lamps +41 (51 are arranged close to each other in a substantially concentric circle).

The lighting fixture main body (2) is connected in series to the lamps (4) and (5) through the changeover switch (7) and the switch (7), respectively, which are connected to the AC power source (6) as shown in Fig. 2. The choke coil (91 (consists of IG, glow lamp αnoz, etc.) as a ballast that lights up the lamp +41 (51) at the rated value. Note that (soa) < 5ob) is the movable contact of the switch (7), and the It works. (
81a) (s2a) of lamp (5), also (slb)
are fixed contacts for lighting each lamp (4). Note that (85a) is the lamp (51, also (821)) (83
b) is a fixed contact for turning off the lamp +41.

In this case, the movable contacts (80a) (80a) of the changeover switch (7)
When the AC power supply (6) is turned on with the contacts (81a) and (81b) switched to the contacts (81a) and (81b), current flows through the choke coil (91(1(1) and the glow lamp aυα2, causing the glow lamps to (13 works,
Choke coil +91 (induces high voltage to IG, lamp (41+51) lights up. Next, switch (7) contact (
80a) (8ob) are contacts (82a) (82b), respectively.
), the lamp (4) goes out and only the lamp (5) lights up. In these lighting conditions, the lamp +41
(Each of 51 consumes rated power and generates rated luminous flux. This rated luminous flux is higher than that of lamp (5).
4) is increasing.

However, in such conventional multi-lamp lighting equipment, although the luminous flux value of the upper large lamp (4) is greater than that of the lamp (4), the distance from the center point of the illuminated surface is long, and It is difficult for the light generated by the lamp (4) to reach the illuminated surface effectively due to the lamp (5) being an obstacle, and the light from the lamp (4) does not affect the illuminance of the illuminated surface efficiently, and the per unit luminous flux is The illuminated illuminance of lamp (5) was lower than that of lamp (5). Therefore, the luminaire efficiency of the lamp (4) is lowered, resulting in a disadvantage that the luminaire efficiency as a whole is lowered.

This invention was made with the aim of improving the above-mentioned drawbacks, and among a plurality of annular fluorescent lamps arranged close to each other concentrically, a lamp arranged at a position closest to the center point of the object to be illuminated is is turned on at a brightness increase rate that is higher than the rated luminous flux value, while the remaining lamps are configured so that the ratio of the set luminous flux value to the rated luminous flux value is less than the above brightness increase rate, thereby providing a multi-lamp lighting fixture with high fixture efficiency. It is something to do.

(3) Examples of the present invention will be described below.

FIG. 3 is a circuit diagram showing one embodiment of the present invention.

The same reference numerals are given to the same or corresponding parts as in the conventional example, and the explanation thereof will be omitted. In the figure, 0 is a high frequency power supply device, 64 is a rectifier circuit that performs full-wave rectification, and includes a smoothing circuit if necessary. α! 9 is an inverter that converts DC power into high frequency power, (15A) and (15B) are a pair of transistors, and (150) is a high frequency choke coil.

(15D) (15K) is the base resistor, (15F) is the resonant capacitor, and (15G) is the output transformer, which is made of a beam transformer. (15H)
is the feedback winding.

(15K) (15J) is the negative winding, (15I) is the secondary winding, aS has an input tap (16EX11SF), and the windings (16a) (115D) are wound with the same polarity.
and an output terminal (1 (SAX16B)), the wholesale is a current limiting choke, and the Os is a changeover switch (18a) (1
8b) are all party and dimming contacts, respectively.

Although not shown in this figure, the electrodes of the lamp +41 (51) are preheated as necessary, for example, by a preheating winding installed in the output transformer (15G). The lamps are arranged as shown in Figure 1 (4).
The cases of W and 32W will be explained.

In the device configured as described above, when the AC power supply (6) is turned on, the inverter (L!9) connects the return winding (15
As is well known, the transistor (15A
) (15B) alternately open and close, and the output Lance (15G)
generates a sinusoidal high-frequency voltage. At this time, the resonant capacitor (15F) forms a resonant circuit with the winding inductance of the output transformer (15G), and controls the frequency of the inverter 09. At this time, the changeover switch or all-party contact (1
8A) is connected, the high frequency voltage lights up a lamp with a low starting voltage, for example a 32W lamp (5). The voltage generated in the winding (6C) by the discharge current of the lamp (5) is stepped up according to the turns ratio of the winding (16D) (!) and applied to the 40W lamp (4) to light it. The output current of the wire (15 wires) is shunted in inverse proportion to the turns ratio of the windings (160) (16D) of the shunt circuit, resulting in a lamp current of +41 (51) for each lamp.These lamps +41 (51 are lamp currents) Since the ratings of the lamps (4) and (5) are the same, the output current of the secondary winding (151) is
), and the number of turns of the 9th winding (160) is less than the number of turns of the winding (16D), the lamp current of the 32W lamp (5) will increase more than the rated value, and the luminous flux will decrease. is also lit at a brightness increase rate (set luminous flux value/rated luminous flux value) that is greater than the rated luminous flux value. On the other hand, the current of the lamp (4) decreases below the rated value, and the luminous flux also decreases, resulting in dimming lighting.

In this way, the efficiency of the appliance can be increased by reducing the power of the 40W lamp (4), which has a low contribution rate per lamp power, and increasing the power of the 32W lamp (5), which has a high contribution rate, to the illuminated surface illuminance. can.

In addition, if you set the total value of the set luminous flux values of the lamps 141 + 51 that have been intensified and dimmed to be equal to the sum of the rated luminous flux values of the two lamps 141 (51), it will be possible to efficiently increase the illuminance of the illuminated surface with the same power. This phenomenon can also be considered as follows: the luminous flux value of the lamp (5), which has a high illuminated surface illuminance with unit luminous flux, increases, while the light emitted at a long distance from the illuminated surface increases. The lamp (51) becomes an obstacle and does not effectively affect the illuminance of the illuminated surface (because the luminous flux of the lamp (4), which has a low illuminance of the illuminated surface per unit luminous flux, decreases, the illuminance of the illuminated surface increases.

(Mound) Equipment efficiency also increases. The short answer is lamp + 41 ((luminous flux of lamp (5) when 51 is lit) / (lamp (4)
If the luminous flux value is set so that the ratio is larger than the luminous flux of ), the efficiency of the appliance will be the same as above.

Also, when the changeover switch α is connected to the dimming contact (18B), the number of turns of the winding @ (160) is further decreased and the lamp (
Although it is attempted to further increase the lamp current in step 5), by appropriately setting the current limiting choke αη, the lamp current and luminous flux values can be made the same as in the above-mentioned full-light lighting. On the other hand, the number of turns of the winding (16D) increases, and the output current of the secondary winding (15D) also decreases due to the current limiting current, so the lamp current of the lamp (4) further decreases and the dimming level deepens. Become. In this case as well, as in the case of full-light lighting, the reduction in the illuminance of the illuminated surface is smaller than the rate of decrease 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 (5) during dim lighting does not necessarily have to be the same as when full light is lit, and the current limiting choke +171 and the input tap (16
A similar effect can be obtained by setting the luminous flux appropriately larger than the rated luminous flux value according to B). In addition, in full-bright lighting where the all-party contact (18A) is connected 8), the lamp (4) does not necessarily have to be lit at a dimming rate below the rated luminous flux, and may have a brightness increase rate lower than that of the lamp (5). has the same effect.

In the above embodiment, two annular fluorescent lamps (4) are used.

As shown in Figure 1, the arrangement of (5) is shown in which the annular fluorescent lamp (5) with a small outer diameter is arranged concentrically with a step at the bottom. Combinations of light lamps are also possible. For example, when a combination of 30W type and :J GW type annular fluorescent lamps are arranged on the same plane, an annular fluorescent lamp with a small outer diameter is arranged above and an annular fluorescent lamp with a large outer diameter is arranged on the same plane. Even when the lamp is placed on the lower side, the same effect as described above can be achieved by making the dimming rate of the annular fluorescent lamp whose distance from the lower illuminated surface is the smallest smaller than that of other annular fluorescent lamps. It becomes possible to obtain the effect. The same effect can be obtained by arranging annular fluorescent lamps having the same outer diameter one above the other with a step on the same axis.

Furthermore, in the above-mentioned embodiment, the case where the lamp is lit with a high frequency voltage was explained, but the present invention is not limited to this.
As shown in the figure, the same effect can be obtained when the choke coil (9) αO is used as a ballast and the violet is lit using a commercial power supply, but when the lamp is lit at a high frequency, the luminous efficiency of the lamp is the same, so the brightness is increased. In addition, the lamp current may be lower than that for commercial lighting, and therefore, if the luminous flux during enhanced lighting is about 150% or less of that when lit with commercial power, the effect of enhanced lighting on the lamp life will be small.

Furthermore, when brightness is increased by high-frequency lighting,9 as previously announced by the present inventors (Proceedings of the Illuminating Engineering Society of Japan in 1972, p.27), there is an advantage that the decrease in luminous efficiency is less than when brightness is increased by commercial frequency. be.

Furthermore, if the sum of the luminous flux of the two lamps is not large when the dimming is turned on, the brightness increase rate of the lamp (51) is increased to generate a predetermined luminous flux, and the dimming is performed in conjunction with, for example, the changeover switch 11 shown in Fig. 3. By turning off the lamp (4) by providing a contact point that short-circuits the lamp (41) when it is turned on, more efficient and diverse illumination is possible.

The difference in lamp brightness due to how hard the lamp +41 +51 is turned on and dimmed is that from outside the shade (3)
1 cannot be discerned due to the diffusion of light, and even when looking up at the multi-lamp lighting equipment, the high brightness lamp (5) is on the lower side and illuminates the lower surface of the upper lamp (4), so it does not spoil the aesthetic appearance.

The circuit for lighting the lamps +41 and +51 at high frequency is not limited to the embodiment, and may be any circuit as long as it can light the lamp (5) in an increased brightness state.

Furthermore, the same effect can be obtained not only with two fluorescent lamps but also with three or more fluorescent lamps.

As explained above, according to the present invention, the center of the illuminated surface is provided in a multi-lamp lighting fixture including a plurality of annular fluorescent lamps that are arranged close to each other in a concentric manner and have different distances from the center point of the illuminated surface. The efficiency of the fixture can be improved by lighting the fluorescent lamp closest to the point at a brightness increase rate higher than the rated luminous flux, and by making sure that the ratio of the set luminous flux value to the rated luminous flux value of the remaining fluorescent lamps is less than the above luminous flux value. The same effect as above can be obtained.

Fig. 1 is a cross-sectional view of a conventional multi-lamp lighting fixture to which the present invention can be applied, Fig. 2 is a circuit diagram of the multi-lamp lighting equipment shown in Fig. 1, and Fig. 3 is an embodiment according to the present invention. FIG. 2 is a circuit diagram of a multi-light lighting fixture.

(2) is the lighting equipment body, (3: is the shade, +4145
1 is an annular fluorescent lamp, (91M is a choke coil, αj
is a high frequency power supply device, aS is an inverter, aυ is a shunt, and U is a changeover switch.

Note that the same reference numerals in each figure indicate the same or corresponding parts.

Agent Masuo Oiwa (12) Figure 1 Figure 2

Claims (1)

[Claims] 0) is a device in which a plurality of annular fluorescent lamps are arranged close to each other concentrically and have different distances from the center point of the illuminated surface, and the distance from the center point of the illuminated surface is the closest to the center point of the illuminated surface. The ring-shaped fluorescent lamps located nearby are lit at a brightness increase rate that is equal to or higher than their rated luminous flux value, and the ratio of the set luminous flux value to the rated luminous flux value of the remaining ring-shaped fluorescent lamps is configured to be less than the above-mentioned brightness increase rate. A multi-light lighting fixture characterized by: (2) Claim (1) characterized in that the sum of the set luminous flux values of the all-annular fluorescent lamps is set to be equal to the sum of the rated luminous flux values of the all-annular fluorescent lamps. Multi-light lighting equipment as described. (31) The multi-lamp lighting device according to claim (1) or (2), characterized in that at least the ring-shaped fluorescent lamp closest to the center point of the illuminated surface is lit at high frequency. (4) The inclination of claims (1) to (3), characterized in that annular fluorescent lamps other than the annular fluorescent lamp closest to the center point of the illuminated surface are configured to be extinguished. Multi-light lighting equipment described in the above.