JP6553389B2 - Discharge tube lighting device and discharge tube lighting method - Google Patents

Description

  The present invention particularly relates to a discharge tube lighting device and a discharge tube lighting method provided with a preheating circuit.

There is a preheating type discharge lamp in which a filament electrode is preheated and then turned on.
The discharge lamp lighting device disclosed in Patent Document 1 includes a lighting circuit for lighting a discharge lamp by outputting an AC voltage between filament electrodes of the discharge lamp, and between both ends of each filament electrode of the discharge lamp connected to the lighting circuit. And a preheating switch for switching the power supply from the lighting circuit to the preheating circuit. With this configuration, when starting the lighting of the discharge lamp, each filament electrode of the discharge lamp is preheated, and when the preheating is not required, the preheating switch is turned off, so that each filament electrode of the discharge lamp It avoids unnecessary power consumption and electrical stress in the preheating circuit.

JP 2005-19142 A

  According to the lighting device disclosed in Patent Document 1, since the preheating circuit is disconnected while the discharge lamp is turned on, power consumption can be reduced. However, since the lighting and preheating are performed by the filament electrode, aging of the filament electrode is likely to progress. If the filament electrode is deteriorated, the discharge lamp can not be turned on.

  SUMMARY OF THE INVENTION In view of the above-described problems of the prior art, it is an object of the present invention to provide a discharge tube lighting device and a discharge tube lighting method capable of achieving energy saving by reducing aged deterioration.

As a first means for solving the above problems, the present invention relates to a discharge tube having a filament electrode at each end of a cylindrical body and a pair of ring electrodes between the filament electrodes, and the ring electrode electrically A lighting circuit comprising: a discharge circuit that is connected to the output of an alternating voltage and is lit; and a preheating circuit that is electrically connected to the filament electrode and is disconnected when the color temperature of the filament electrode reaches 700 to 750K It is providing the discharge tube lighting device characterized by comprising.

As a second means for solving the above-mentioned problems, the present invention is characterized in that a discharge tube having a filament electrode at each end of a cylindrical body and a pair of ring electrodes between the filament electrodes, and the ring electrode electrically A lighting circuit comprising: a discharge circuit that is connected to the output of an alternating voltage and is lit; and a preheating circuit that is electrically connected to the filament electrode and is disconnected when the color temperature of the filament electrode reaches 700 to 750K A preheating step of preheating the discharge tube by energizing the filament electrode by the preheating circuit of the discharge tube lighting device comprising: a discharging step of outputting an alternating voltage to the ring electrode by the discharge circuit and lighting the discharge electrode; a cutting step in which the color temperature of the filament electrode by preheating circuit disconnects the power supply of the filament electrode upon reaching a 700～750K, the And to provide a discharge lamp lighting method which is characterized in that.

  According to the present invention configured as described above, since the filament electrode is preheated and the ring electrode is lit, the discharge tube can be lit by the ring electrode even when the filament electrode is aged.

  Further, since the filament electrode is preheated and cut after being energized for a predetermined time, it is possible to reduce the aging of the filament electrode and reduce the power consumption of the entire apparatus.

It is the structure schematic of the discharge tube lighting device of this invention.

DESCRIPTION OF EMBODIMENTS Embodiments of a discharge tube lighting device and a discharge tube lighting method of the present invention will be described in detail below with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a discharge tube lighting device according to the present invention. As shown in the figure, the discharge tube lighting device 10 of the present invention has a discharge tube 20 and a lighting unit 40 as the main basic components.

[Discharge tube 20]
The discharge tube 20 has a cylindrical main body 22, a filament electrode 24, and a ring electrode 26 as a main basic configuration.
The cylindrical body 22 is a long quartz glass tube having a predetermined strength. The cylindrical body 22 is filled with an inert gas such as argon at a predetermined pressure and a small amount of mercury. In addition, a pair of filament electrodes 24 and a pair of ring electrodes 26 are attached to the metal mouth sides of both ends of the cylindrical body 22.

The filament electrode 24 is formed in a coil shape using tungsten as a material, and a pair of lead wires 24a and 24b are connected to both ends. The lead wires 24a and 24b are electrically connected to a preheating circuit 44 described later.
The ring electrode 26 is an electrode made of a metallic material such as tungsten or molybdenum and having a crown shape. The ring electrode 26 of this embodiment is attached between a pair of filament electrodes 24. Lead wires 26 a and 26 b are connected to the ends of the pair of ring electrodes 26. The lead wires 26a and 26b are electrically connected to a discharge circuit 42 described later.

  In the discharge tube 20 having such a configuration, the lead wires 24a and 24b from the filament electrode 24 and the lead wires 26a and 26b from the ring electrode 26 are connected from the metal ports at both ends, respectively. . The discharge tube 20 is a hot cathode low-pressure discharge tube capable of emitting ultraviolet light whose main wavelength is 254 nm and 185 nm.

[Lighting unit 40]
The lighting unit 40 has a discharge circuit 42 and a preheating circuit 44 as main basic configurations.
The discharge circuit 42 comprises a primary winding 42a connected to the lead wires 26a and 26b of the pair of ring electrodes 26, and capacitors 42b and 42c.
The preheating circuit 44 includes a primary winding 44a and a secondary winding 44b connected to the leads 24a and 24b of the pair of filament electrodes 24.
The main power supply 50 includes a primary winding 50a.

[Effect]
The operation of the discharge tube lighting device of the present invention having the above configuration will be described below.
In the preheating process, first, the filament electrode 24 is energized by the preheating circuit 44. The preheating circuit 44 increases the voltage to such an extent that discharge can be started and maintained. That is, a voltage is applied to the primary winding 50a of the main power supply 50, and the induced voltage generated in the primary winding 44a and the secondary winding 44b of the preheating circuit 44 is applied to the filament electrode 24 as a preheating voltage. When the filament electrode 24 is sufficiently heated, thermoelectrons are emitted. The ionization is improved by ionizing the excessive amount of thermionic electrons inside the discharge tube 20.

  In the discharging process, an AC voltage is output to the ring electrode 26 by the discharging circuit 42. That is, when an induced voltage generated in the primary winding 42a of the discharge circuit 42 by applying a voltage to the primary winding 50a of the main power supply 50 is applied to the ring electrode 26 as a high voltage, the thermoelectrons are moved to the anode side. It is pulled, moves at high speed, collides with an inert gas such as argon, and discharge starts. Then, electrons moving by the discharge collide with mercury atoms to generate ultraviolet light.

  In the cutting step, the energization to the filament electrode 24 by the preheating circuit 44 is cut off after energization for a predetermined time by the preheating circuit 44. As a standard after energization for a predetermined time in this embodiment, the filament electrode is cut when the color temperature reaches 700 to 750K. A standard when the color temperature of the filament electrode reaches 700 to 750K is, for example, about 10 seconds after the voltage of the preheating circuit 44 is applied.

[Example]
A voltage was output to the filament electrode 24 for preheating by the preheating circuit 44 of the discharge tube lighting device 10 of the present invention, and the preheating circuit 44 was disconnected 10 seconds after the color temperature of the filament electrode 24 reached 750K. Before and after cutting, the discharge circuit 42 outputs a voltage of 500 V to the ring electrode 26. After 30 seconds, the rated lamp voltage can be discharged at 150V.

  According to such a discharge tube lighting device of the present invention, a withstand voltage cable that can withstand a high voltage as compared with a configuration in which a high voltage (2000 V) is output to an igniter and discharged as in a conventional cold cathode discharge tube. There is no need to use it, and the cost reduction of the device configuration can be realized. In addition, even in an environment such as a cold district where it is difficult to discharge even if a high voltage is output, preheating is performed to ionize thermionic electrons inside the discharge tube in an excessive amount, thereby improving ionization. It can be discharged.

Further, since the filament electrode 24 is preheated and the ring electrode 26 is lit, the discharge tube 20 can be lit by the ring electrode 26 even when the filament electrode 24 is deteriorated with age.
In addition, since the filament electrode 24 is preheated and cut after being energized for a predetermined time, deterioration of the filament electrode 24 with age can be reduced and power consumption of the entire apparatus can be reduced.

  The discharge tube lighting device and the discharge tube lighting method of the present invention are particularly useful in the field of hot cathode type low pressure discharge tubes.

DESCRIPTION OF SYMBOLS 10 ......... Discharge tube lighting device, 20 ......... Discharge tube, 22 ......... Cylinder body, 24 ......... Filament electrode, 24a, 24b ......... Lead wire, 26 ......... Ring electrode, 26a, 26b ... ...... Lead wire, 40... Lighting section, 42... Discharge circuit, 44... Preheating circuit, 50 .... Main power supply, 50 a.

Claims (2)

A discharge tube having a filament electrode at each end of the cylindrical body and a pair of ring electrodes between the filament electrodes;
A discharge circuit electrically connected to the ring electrode to output an alternating voltage and lit, and a preheat circuit electrically connected to the filament electrode and cut off when the color temperature of the filament electrode reaches 700 to 750 K. What is claimed is: 1. A discharge tube lighting apparatus comprising: a lighting unit comprising: A filament electrode at each end of a cylindrical body; a discharge tube having a pair of ring electrodes between the filament electrodes; a discharge circuit that is electrically connected to the ring electrode and outputs an alternating voltage; and the filament A preheating circuit that is electrically connected to the electrode and cuts when the color temperature of the filament electrode reaches 700 to 750K, and the filament electrode is energized by the preheating circuit of the discharge tube lighting device having a lighting unit. A preheating step for preheating the discharge tube;
A discharge step of turning on and outputting an alternating voltage to the ring electrode by the discharge circuit;
A cutting step of cutting the energization of the filament electrode when the color temperature of the filament electrode reaches 700 to 750 K by the preheating circuit;
A discharge tube lighting method comprising:

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