JP2004186059A - Discharge lamp lighting device and bulb-shaped fluorescent lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a discharge lamp lighting device improving start of luminous flux of a bulb-shaped fluorescent lamp. <P>SOLUTION: In this discharge lamp lighting device, a plurality of discharge lamps and a high-frequency lighting device are disposed integrally. Each of the plurality of discharge lamps has arc tubes 7a, 7b and electrodes 21, 22 and electrodes 23, 24 disposed on both ends of arc tubes 7a, 7b. The high-frequency lighting device 2 is connected with the electrodes 21, 22 and electrodes 23, 24 which each of the plurality of discharge lamps has in parallel and provides electric power. The arc tubes 7a, 7b which each of the plurality of discharge lamps has preferably have almost the same length. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a discharge lamp lighting device that improves the rising of a luminous flux of a bulb-type fluorescent lamp.
[0002]
[Prior art]
In a bulb-type fluorescent lamp, which emits a fluorescent discharge lamp in which a plurality of U-shaped arc tubes are joined at a high frequency, if the length of the discharge path becomes longer, the rise of the luminous flux immediately after lighting becomes slower, and it takes more time to become brighter. I needed to.
In addition, when the inner diameter of the arc tube is reduced for miniaturization, the same problem still occurs.
These are particularly remarkable when a mercury compound (mercury amalgam: hereinafter, referred to as amalgam) is arranged in the arc tube in order to reduce the size, and the diffusion of mercury is slowed, and the time required for the light flux to rise is increased. I needed it.
In order to improve the rise, in addition to the so-called amalgam, what is called an auxiliary amalgam is appropriately arranged in the arc tube.However, when the discharge path is long, the tube diameter is small, etc. The rise of the luminous flux was slow.
[0003]
[Problems to be solved by the invention]
Therefore, an object of the present invention is to provide a discharge lamp lighting device that improves the rising of the light flux of a bulb-type fluorescent lamp.
[0004]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2000-222903
[Means for Solving the Problems]
A discharge lamp lighting device according to the present invention is a discharge lamp lighting device in which a plurality of discharge lamps and a high-frequency lighting device are arranged integrally.
The high-frequency lighting device supplies power to the plurality of discharge lamps in parallel.
[0006]
Each of the plurality of discharge lamps has an arc tube and electrodes arranged at both ends of the arc tube,
The high-frequency lighting device is characterized in that the electrodes of the arc tubes of the plurality of discharge lamps are connected in parallel to supply power.
[0007]
The arc tubes included in each of the plurality of discharge lamps have substantially the same length and form a U-shape.
[0008]
A discharge lamp lighting device according to the present invention is a discharge lamp lighting device in which a discharge lamp and a high-frequency lighting device are arranged integrally.
The discharge lamp is
An arc tube,
Two electrodes (hereinafter, referred to as “two end electrodes”) disposed at both ends of the arc tube, and an electrode (hereinafter, referred to as “intermediate electrode”) disposed between the two end electrodes. With
The high-frequency lighting device is characterized in that the high-frequency lighting device is connected to a path connecting the two end electrodes and the intermediate electrode.
[0009]
The intermediate electrode is disposed substantially at the center of the arc tube.
[0010]
The arc tube has an even number of U-shaped portions,
The intermediate electrode is arranged so as to have the same number of U-shaped portions between each of the two end electrodes.
[0011]
The discharge lamp has amalgam near the electrodes.
[0012]
In the arc tube, the length (part) of the arc tube portion (part) sandwiched between the electrodes is L (cm: centimeter), and the cross-sectional area of the inner diameter of the arc tube portion is S (cm ² : square centimeter). , L / S <40 (cm ⁻¹ ).
[0013]
The high frequency lighting device includes a balancer having a boosting action.
[0014]
A bulb-type fluorescent lamp according to the present invention is a bulb-type fluorescent lamp having a discharge lamp lighting device in which a plurality of discharge lamps and a high-frequency lighting device are arranged integrally.
The high-frequency lighting device supplies power to the plurality of discharge lamps in parallel.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
A description will be given of a discharge lamp lighting device in which a discharge lamp and a high-frequency lighting device are integrally arranged, and the high-frequency lighting device supplies electric power to the discharge lamp in parallel.
In the following description of the embodiments, the definitions (meanings) of terms are as follows unless otherwise specified.
[0016]
The discharge lamp lighting device is a device that integrally includes at least a discharge lamp that emits light and a high-frequency lighting device that lights the discharge lamp. That is, the discharge lamp and the high-frequency lighting device are arranged in the same device and exist as a single unit. Further, the discharge lamp lighting device is used for a bulb-type fluorescent lamp.
[0017]
The discharge lamp includes an arc tube that emits fluorescent light and emits fluorescence when turned on, and at least two electrodes disposed at both ends of the arc tube. The discharge lamp is also called a fluorescent discharge lamp.
The arc tube is formed from a glass tube coated with a fluorescent paint. In the following embodiment, the shape of the arc tube will be described by taking a U-shape as an example, but the shape is not limited thereto.
The electrode is supplied with power from the high-frequency lighting device.
[0018]
The high-frequency lighting device supplies power supplied from a power supply to the discharge lamp. The high-frequency lighting device has at least two output terminals connected to the electrodes of the discharge lamp.
[0019]
Embodiment 1 FIG.
In this embodiment, a case will be described in which the discharge lamp lighting device includes two discharge lamps and a high-frequency lighting device.
FIG. 1 is a diagram illustrating an example of a configuration of the high-frequency lighting device according to the first embodiment.
FIG. 2 is a diagram illustrating an example of a configuration of the discharge lamp according to the first embodiment. FIG. 2 shows an expanded view of the discharge lamp.
FIG. 3 is a view of the discharge lamp mounted on the discharge lamp lighting device according to the first embodiment as viewed from the bottom. The bottom surface refers to the discharge lamp side (the side opposite to the base).
FIG. 1 shows a power supply 1 such as an AC power supply (commercial AC power supply), a high-frequency lighting device 2 for lighting a discharge lamp, and a discharge lamp (hereinafter, also referred to as a “discharge lamp A”) including an arc tube 7 a and electrodes 21 and 22. ), And a discharge lamp (hereinafter, also referred to as “discharge lamp B”) including the arc tube 7 b and the electrodes 23 and 24. No reference numeral is given to the discharge lamp. In the following description, the discharge lamp A and the discharge lamp B are referred to as “discharge lamps” unless particularly distinguished.
The high-frequency lighting device 2 includes switching means Q ₁ and Q ₂ , rectifying capacitors 3, coils 4 and 11, balancers 5, resonant capacitors 6 a and 6 b, coupling capacitors 8, a driving circuit 9, a capacitor 10, and a rectifying circuit 12. Here is an example.
[0020]
As shown in FIG. 2, the discharge lamp A has a U-shaped arc tube 7 a and electrodes 21 and 22. The arc tube 7 a has two U-shaped portions joined by a joint 25. Similarly, the discharge lamp B also has an arc tube 7b and electrodes 23 and 24, and the arc tube 7b has two U-shaped portions joined by a joint 26.
FIG. 2 shows the configuration of the discharge lamp in a plan view, while FIG. 3 shows the discharge lamp mounted on the high-frequency lighting device 2.
[0021]
1 and 2, the electrodes 21 and 22 and the electrodes 23 and 24 are connected in parallel, and the high-frequency lighting device 2 supplies electric power to the respective discharge lamps in parallel.
Specifically, in the high-frequency lighting device 2 of FIG. 1, the switching means Q ₁ and Q ₂ generate a high-frequency voltage to light (start) the arc tubes 7a and 7b. Therefore, the current passing through the resonance capacitors 6a and 6b and the coil 4 is divided by the balancer 5 and supplied to the arc tubes 7a and 7b.
The current supplied to the discharge lamps A and B becomes a discharge voltage via the electrodes 21 to 24 and starts the discharge of the arc tube 7a and the arc tube 7b.
[0022]
As described above, in this embodiment, the high-frequency lighting device includes a plurality of discharge lamps having a U-shaped arc tube and a high-frequency lighting device for lighting the discharge lamp at high frequency. (Discharge lamp lighting device) has been described to supply power in parallel to the arc tubes of the plurality of discharge lamps. The high-frequency lighting device has an output terminal for lighting the arc tubes in parallel.
[0023]
As described above, by supplying power to the discharge lamps in parallel, it is possible to improve so that the rising of the luminous flux becomes faster.
[0024]
Embodiment 2 FIG.
FIG. 4 is a diagram illustrating an example of a configuration of the discharge lamp according to the second embodiment. FIG. 2 shows a view in which a discharge lamp is developed.
FIG. 5 is a diagram illustrating an example of a configuration of the high-frequency lighting device according to the second embodiment.
FIG. 6 is a view of the discharge lamp mounted on the discharge lamp lighting device of Embodiment 2 as viewed from the bottom. The bottom surface refers to the discharge lamp side (the side opposite to the base).
FIG. 4 shows an example in which the two arc tubes are joined to form one discharge lamp without separating the arc tube 7a and the arc tube 7b as two discharge lamps.
The components denoted by the same reference numerals as those in FIGS. 1 and 2 are the same as those in FIGS.
Further, since the discharge lamp C shown in FIG. 4 is joined by the joint 27 and cannot be separated, it will be described as one discharge lamp C. However, in FIG. 4, FIG. 5, and FIG. 6, the corresponding portions of the discharge lamp C are denoted by the same reference numerals in order to make the correspondence between FIG. 1, FIG.
[0025]
In FIG. 4, the arc tube 7a and the arc tube 7b shown in FIG. 1 are joined by a joint 27 to form the arc tube 7 connected to one. The arc tube 7 is a combination of the arc tube 7a and the arc tube 7b. In FIG. 4, reference numerals are assigned so as to correspond to the arc tubes 7a and 7b in FIG.
The electrode 27 discharges to both the arc tube 7a and the arc tube 7b.
It is desirable that the arc tube 7 has the same length and shape as the arc tube 7a and the arc tube 7b. This is to ensure that the discharge voltage is transmitted evenly.
Further, the provision of the joint portion 27 makes it possible to reduce the number of electrodes.
[0026]
In FIG. 4, the electrodes 21 and 24 arranged at both ends of the arc tube 7 are also called end electrodes. The electrode 22 disposed between the electrode 21 and the electrode 24, that is, between the two end electrodes is also referred to as an intermediate electrode. The electrode 22 is preferably arranged substantially at the center of the arc tube 7.
The arc tube 7 has an even number of U-shaped portions, and the intermediate electrode is arranged between the two end electrodes so as to have the same number of U-shaped portions.
[0027]
Further, as shown in FIG. 5, the high-frequency lighting device 2 is connected to a path connecting the electrode 21 and the electrode 24 (a path connecting two end electrodes) and to the electrode 22. That is, the high-frequency lighting device 2 has an output terminal connected to the path and the electrode 22. Thus, the high-frequency lighting device 2 supplies power to the arc tube 7 in parallel using the two output terminals.
[0028]
As described above, in this embodiment, a description has been given of a discharge lamp lighting device in which a common electrode is provided at substantially the center of a plurality of U-shaped arc tubes of a discharge lamp, and the discharge lamps are lit in parallel.
[0029]
As described above, similarly to the first embodiment, it is possible to improve the light beam so that the light beam rises quickly. In particular, it is effective for a discharge lamp having a long arc tube length, that is, a large output (for example, 100 watts (W)).
[0030]
Embodiment 3 FIG.
FIG. 7 is a diagram illustrating an example of a configuration of the discharge lamp according to the third embodiment.
FIG. 7 shows an example in which the auxiliary amalgam is arranged near the three electrodes in the discharge lamp shown in FIG.
Similarly, in the discharge lamp shown in FIG. 2, the auxiliary amalgam can be arranged in the vicinity of the four electrodes. However, when the number of the auxiliary amalgams is equal to the number of the electrodes, compared with the discharge lamp of FIG. The discharge lamp of FIG. 7 can reduce the number of auxiliary amalgams. For this reason, cost can be reduced.
[0031]
As described above, in this embodiment, the discharge lamp (fluorescent discharge lamp) is formed from an even number of U-shaped arc tubes, is composed of two portions having substantially equal discharge lengths, and amalgam is formed in each of them. The arranged discharge lamp lighting device has been described.
[0032]
Embodiment 4 FIG.
The example in which the high-frequency lighting device 2 of FIGS. 1 and 5 includes the balancer 5 has been described.
The balancer 5 may be a diversion means having two windings as generally known. It may have a relatively large number of turns that does not saturate at the desired voltage value. In FIG. 1 and FIG. 5, it is indicated by a winding 5a and a winding 5b.
When such a balancer 5 is used, when one of the arc tubes, for example, the arc tube 7a starts discharging at the time of starting, a voltage is generated on the winding 5b side by the boosting action by the current flowing through the winding 5a, and the other arc tube 7b discharges. Getting started can be easier.
[0033]
FIGS. 1 and 5 use the balancer 5 as a means for performing parallel lighting. However, instead of the balancer 5, a parallel lighting in which one coil 4 is connected to each of the arc tubes 7a and 7b one by one corresponding to the arc tube 7a and the arc tube 7b, respectively. It may be a configuration. The high-frequency lighting device is not limited to the device of the embodiment, and may have a configuration other than the configuration to be illustrated as long as the configuration allows lighting of the arc tube at high frequency.
[0034]
As described above, in this embodiment, the discharge lamp lighting device including the balancer having the boosting action and lighting the arc tube in parallel has been described.
[0035]
Embodiment 5 FIG.
In the fifth embodiment, the relationship between the arc tube length and the tube diameter will be described.
The arc tube length refers to the length of the arc tube between one electrode and another electrode.
No electrodes are located between one electrode and the other.
As described in the second embodiment, when the intermediate electrode is provided, it refers to the length of the arc tube between the end electrode and the intermediate electrode.
FIG. 8 is a diagram showing the relationship among the arc tube length, the tube diameter (outer diameter), and the rise of the light flux.
The arc tube shown in FIG. 8 used was one in which amalgam (a mercury alloy) was sealed.
The arc tube length (arc tube length) and tube diameter are shown in the lower right of FIG.
The tube diameter shown in FIG. 8 was the outer diameter. The inner diameter was about 8 mm when the outer diameter was about 10 mm, and the inner diameter was about 9 mm when the outer diameter was about 11 mm.
[0036]
As shown in FIG. 8, as the arc tube length increases, it takes time for the light flux to rise.
This is because the time required for diffusion of the enclosed mercury (mercury contained in amalgam) is long.
On the other hand, when the tube diameter is large, the rise is improved even if the arc tube length is long.
This is considered to be because the cross-sectional area of the arc tube is large and the diffusion of mercury is promoted.
The above-mentioned results are changed by changing the composition of the amalgam, but in a practical amalgam composition, the tendency is almost the same.
Therefore, when the following (1) and (2) were satisfied, good results were obtained for the rise of the light flux.
(1) For an arc tube having an outer diameter of about 10 mm, the arc tube length should be up to about 200 mm.
(2) For an arc tube having an outer diameter of about 11 mm, the arc tube length should be up to about 250 mm.
In particular, when the arc tube length was 350 mm and the tube diameter was 10 mm, the rise of the luminous flux was poor, which was an undesirable result.
[0037]
From the above results (1) and ( ² ), the ratio of the arc tube length L (cm) to the inner diameter cross-sectional area S (cm ² ) of the arc tube is as follows.
In the above (1), L / S = 39.8 (cm ⁻¹ ) (3)
In the above (2), L / S = 39.3 (cm ⁻¹ ) (4)
(Cm ^-1 ) is a unit determined from (cm / cm ² ).
According to the above (3) and (4), the arc tube is divided and lit in parallel so that approximately L / S <40 (cm ^-1 ), so that even if the arc tube has a large output, good startup performance can be obtained. Can be realized.
In other words, by dividing the arc tube and lighting it in parallel so that the arc tube length satisfies the above condition, a good rise of the luminous flux can be obtained. Specifically, as described in Embodiment 1, a long arc tube is divided into a plurality of discharge lamps, or as described in Embodiment 2, an intermediate electrode is provided between the arc tubes. By arranging and so on, the arc tubes (discharge lamps) are lit in parallel.
[0038]
Embodiment 6 FIG.
In the above embodiment, the case where the arc tube is formed in a U-shape has been described, but the arc tube is not limited to this. Other shapes may be used. Further, it is desirable that the number of U-shapes is an even number in the arc tube of the entire discharge lamp. This is because it is desirable to make the power supplied by the electrodes connected in parallel equal and to make the arc tubes the same length. That is, it is desirable that the arc tube 7a disposed between the electrodes 21 and 22 and the arc tube 7b disposed between the electrodes 23 and 24 have substantially the same length. It is desirable that the number of U-shaped shapes be the same and that the shapes be the same in order to make the transmission manner the same.
[0039]
In the first embodiment, the case where the discharge lamp lighting device has two discharge lamps has been described. However, the discharge lamp lighting device may have three or more discharge lamps.
[0040]
【The invention's effect】
According to the present invention, since electric power is supplied to the discharge lamp (arc tube) in parallel, the voltage in the arc tube (discharge tube) can be reduced. In addition, it is easier to light the lamp stably than when the length of the arc tube (discharge path) is long. Furthermore, starting becomes easy because the discharge starting voltage is reduced. In addition, since the voltage can be reduced by the parallel lighting, even when the power supply voltage is low, even a large-power discharge lamp having a long discharge path can be stably lit.
[0041]
Further, by arranging the electrodes at an intermediate point of the arc tube of the discharge lamp, the number of electrodes can be reduced.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating an example of a configuration of a high-frequency lighting device according to a first embodiment.
FIG. 2 is a diagram illustrating an example of a configuration of a discharge lamp according to the first embodiment.
FIG. 3 is a bottom view of the discharge lamp mounted on the discharge lamp lighting device according to the first embodiment;
FIG. 4 is a diagram illustrating an example of a configuration of a discharge lamp according to a second embodiment.
FIG. 5 is a diagram illustrating an example of a configuration of a high-frequency lighting device according to a second embodiment.
FIG. 6 is a bottom view of the discharge lamp mounted on the discharge lamp lighting device according to the second embodiment;
FIG. 7 is a diagram illustrating an example of a configuration of a discharge lamp according to a third embodiment.
FIG. 8 is a diagram showing the relationship among the arc tube length, the tube diameter (outer diameter), and the rise of a light beam.
[Explanation of symbols]
1 power supply, 2 high frequency lighting device, 3 rectifying capacitor, 4,11 coil, 5 balancer, 5a, 5b winding, 6a, 6b resonance capacitor, 7a, 7b arc tube, 8 coupling capacitor, 9 drive circuit, 10 capacitor, 12 rectifier circuit, 21 to 24 electrodes, 25 to 27 junction, 31 to 33 auxiliary _amalgam, Q 1, _{Q 2} switching means.

Claims (10)

In a discharge lamp lighting device in which a plurality of discharge lamps and a high frequency lighting device are integrally arranged,
The high frequency lighting device supplies electric power to the plurality of discharge lamps in parallel. Each of the plurality of discharge lamps has an arc tube and electrodes disposed at both ends of the arc tube,
2. The discharge lamp lighting device according to claim 1, wherein the high-frequency lighting device supplies power by connecting electrodes of arc tubes included in each of the plurality of discharge lamps in parallel. 3. The discharge lamp lighting device according to claim 2, wherein the arc tubes of each of the plurality of discharge lamps have substantially the same length and form a U-shape. In a discharge lamp lighting device in which a discharge lamp and a high-frequency lighting device are arranged integrally,
The discharge lamp is
An arc tube,
Two electrodes (hereinafter, referred to as “two end electrodes”) disposed at both ends of the arc tube, and an electrode (hereinafter, referred to as “intermediate electrode”) disposed between the two end electrodes. With
The high-frequency lighting device is characterized in that the high-frequency lighting device is connected to a path connecting the two end electrodes and the intermediate electrode. The discharge lamp lighting device according to claim 4, wherein the intermediate electrode is disposed substantially at the center of the arc tube. The arc tube has an even number of U-shaped portions,
The discharge lamp lighting device according to claim 4, wherein the intermediate electrode is disposed so as to have the same number of U-shaped portions between each of the two end electrodes. The discharge lamp lighting device according to any one of claims 1 to 5, wherein the discharge lamp has amalgam near an electrode. The arc tube has a length L (cm: centimeter) and a cross-sectional area S (cm ² : square centimeter) of the arc tube portion between the electrodes. 8. The discharge lamp lighting device according to claim 2, wherein L / S <40 (cm ^-1 ). The discharge lamp lighting device according to any one of claims 1 to 8, wherein the high-frequency lighting device includes a balancer having a boosting action. In a bulb-type fluorescent lamp having a discharge lamp lighting device in which a plurality of discharge lamps and a high-frequency lighting device are integrally arranged,
The high-frequency lighting device supplies electric power to the plurality of discharge lamps in parallel.

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