JP2013235803A - Electrode for discharge lamp, fluorescent lamp for exclusive use for high-frequency lighting, and illuminating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrode for a discharge lamp, a fluorescent lamp for an exclusive use for high-frequency lighting, and an illuminating device, capable of increasing the electrode capacity to increase a deposition amount of an electronic radioactive substance, and of securing temperature rising of the electrode when a current flows.SOLUTION: With respect to an electrode 4 for a discharge lamp, a diameter of a main wire 10 is 0.050-0.063 mm, a diameter of a primary mandrel wire 11 is 0.07-0.13 mm, a diameter of a secondary mandrel wire 14 is 0.20-0.35 mm, and a first coil pitch Pby winding of a sub wire 12 is 0.07-0.13 mm. The electrode 4 is configured by a triple coil on which an electronic radioactive substance is deposited.

Description

  Embodiments described herein relate generally to an electrode for a discharge lamp, a fluorescent lamp dedicated to high-frequency lighting provided with the electrode, and a lighting device equipped with the fluorescent lamp.

  In recent years, as a discharge lamp for illumination, for example, a fluorescent lamp dedicated for high-frequency lighting has been widely used because of its high efficiency. In the case of such a fluorescent lamp, a longer life is expected in order to reduce the replacement frequency of the fluorescent lamp.

  In general, it is known that the lighting life of a fluorescent lamp is proportional to the amount of electron-emitting material (emitter) deposited on a filament as an electrode. The emitters are scattered and evaporated at the time of starting and lighting of the lamp and are consumed with the lighting time.

  Therefore, it is conceivable to increase the volume of the filament in order to increase the deposition amount of the emitter on the filament to extend the life. That is, the volume for holding the emitter in the filament is increased to increase the deposition amount of the emitter.

  On the other hand, in order to adapt such a fluorescent lamp to the current lighting device (inverter), it is desirable that the cold resistance value of the filament and the resistance value when a current is passed are values equal to the current values.

JP 2002-56805 A

  However, when the volume of the filament is increased as described above, the heat capacity increases, so that the temperature of the filament is insufficient when the same current as before is supplied, and it is difficult to start properly, and the characteristics of the filament However, there is a risk that the specified values defined in JIS (Japanese Industrial Standards) standard, JIS C 7617-2 and JIS C 7618-2 may not be satisfied.

  The present invention has been made in view of the above problems, and increases the volume of the electrode to increase the deposition amount of the electron-emitting material, and at the same time, ensures the temperature rise of the electrode when a current is passed, An object of the present invention is to provide a high-frequency lighting-only fluorescent lamp and a lighting device.

  The discharge lamp electrode according to the embodiment of the present invention has a main wire diameter of 0.050 to 0.063 mm, a primary mandrel wire diameter of 0.07 to 0.13 mm, and a secondary mandrel wire diameter of 0.20 to 0.03 mm. 35 mm, the first coil pitch by winding the sub wire is 0.07 to 0.13 mm, and it is composed of a triple coil to which an electron-emitting material is deposited.

  According to the embodiment of the present invention, the electrode volume is increased to increase the amount of the electron-emitting material, and the discharge lamp electrode capable of ensuring the temperature rise of the electrode when a current is passed, the high-frequency lighting dedicated fluorescence Lamps and lighting devices can be provided.

It is a front view which shows some cross sections of the fluorescent lamp only for high frequency lighting which concerns on embodiment of this invention. It is a perspective view of the principal part (electrode) which shows the fluorescent lamp for exclusive use of the high frequency lighting partially. It is a perspective view which shows the first coil of the electrode in the fluorescent lamp only for the high frequency lighting. It is a perspective view which shows the second coil of the electrode in the fluorescent lamp only for the high frequency lighting. It is a perspective view which shows the third coil of the electrode in the fluorescent lamp only for the high frequency lighting. It is a perspective view which shows a ceiling direct attachment type | mold fluorescent lamp fixture as embodiment of the illuminating device using the fluorescent lamp only for the same high frequency lighting.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 6. 1 and 2 show a high-frequency lighting-only fluorescent lamp, and FIGS. 3 to 5 show discharge lamp electrodes. FIG. 6 shows a lighting device.

  As shown in FIGS. 1 and 2, the fluorescent lamp 1 is, for example, a 32 W type “FHF32” which is a high-frequency lighting-only fluorescent lamp. The fluorescent lamp 1 includes a glass bulb 2, a phosphor layer 3, an electrode 4, and a base 5.

  The glass bulb 2 is made of soft glass such as soda lime glass, and has dimensions of a tube outer diameter of 25.5 mm, a tube inner diameter of 24.0 mm, a wall thickness of 0.75 mm, and a tube length of 1198 mm. A pair of glass stems 21 are airtightly provided at both ends of the glass bulb 2 in the axial direction.

  The glass bulb 2 is formed of soft glass such as soda lime glass, but may be formed of hard glass such as borosilicate glass or quartz glass.

  The phosphor layer 3 is formed over substantially the entire length of the inner surface of the glass bulb 2. The phosphor layer 3 is formed of, for example, a three-wavelength emission type phosphor, and is colored by mixing phosphor fine particles of a red emission type phosphor, a green emission type phosphor, and a blue emission type phosphor. It is configured to generate white light emission by mixed light.

Specific examples of the three-wavelength emission type phosphor include Y ₂ O ₃ : Eu ³⁺ as a red emission type phosphor having a peak wavelength near 610 nm, and a green emission type phosphor having a peak wavelength around 540 nm ( La, Ce, Tb) PO ₄ , BaMg ₂ Al ₁₆ O ₂₇ : Eu ²⁺ , and the like are applicable as a blue light emitting phosphor having a peak wavelength near 450 nm.

A protective film may be interposed between the inner surface of the glass bulb 2 and the phosphor layer 3. The protective film is preferably composed of metal oxide fine particles, and alumina (Al ₂ O ₃ ), silica (SiO ₂ ), or the like can be used as the metal oxide fine particles.

  In addition, rare gas and mercury are sealed inside the glass bulb 2 as a discharge medium. In this embodiment, argon (Ar) is used as the rare gas, but neon (Ne) or krypton (Kr) may be mixed and sealed.

  Mercury encapsulates liquid mercury or an amalgam exhibiting mercury vapor pressure characteristics substantially similar to liquid mercury, such as Zn-Hg or Ti-Hg amalgam. When encapsulating as an amalgam, it can be formed into a pellet or amalgam can be supported on a metal plate.

  As will be described in detail later, the discharge lamp electrode 4 is a filament formed by winding a tungsten wire in triplicate, and is composed of a triple coil. The electrode 4 is a hot cathode type filament electrode in which an electron-emitting material is deposited on the coiled portion.

  A pair of electrodes 4 are sealed at both ends of the glass bulb 2 so as to cause a discharge in the glass bulb 2. Specifically, the electrode 4 is disposed so as to be laid between the distal end portions of a pair of internal introduction wires 41 that penetrates the stem 21 in an airtight manner and is introduced into the glass bulb 2, and both end portions thereof are internal. The lead wire 41 is clamped and held.

  The base 5 is a G13 type, and includes a base body 51 and a pair of base pins 52. The base body 51 has a cap shape and is bonded to both ends of the glass bulb 2. The pair of base pins 52 are insulated from each other by the base body 51 and are connected to external lead wires (not shown).

Next, the discharge lamp electrode 4 will be described in detail with reference to FIGS. 3 to 5 show an outline of the manufacturing situation of the electrode 4, FIG. 3 shows the first stage, FIG. 4 shows the second stage, and FIG. 5 shows the third stage (completion stage). . The electrode 4 is comprised by the triple coil with the tungsten wire. The manufacturing process is not limited to the following.
<First stage (first coil)>

As shown in FIG. 3, a main mandrel wire 11 made of molybdenum is disposed so that a main wire 10 made of tungsten follows a primary mandrel wire 11 made of molybdenum. On the outer circumferences of the main wire 10 and the primary mandrel wire 11, the wire diameter is smaller than these, and the sub-wire 12 formed of tungsten is wound in a coil shape with a predetermined first coil pitch P ₁ .
Thus, the first coil 13 is configured by winding the sub-wire 12 around the outer circumference of the main wire 10 and the primary mandrel wire 11.
<Second stage (second coil)>

As shown in FIG. 4, the first coil 13 configured as described above has a predetermined second coil pitch P on the outer periphery of the secondary mandrel wire 14 formed of molybdenum having a larger diameter than the primary mandrel wire 11. ₂ is wound into a coil.
Thus, the second coil 15 is formed by winding the first coil 13 around the outer periphery of the secondary mandrel wire 14.
<Third stage (third coil)>

As shown in FIG. 5, the second coil 15 configured as described above has a predetermined third coil pitch on the outer periphery of the tertiary mandrel wire 16 formed of a piano wire having a larger diameter than the secondary mandrel wire 14. is coiled form a P _3. The tertiary mandrel wire 16 formed from the piano wire is pulled out immediately after the second coil 15 is wound.

  Subsequently, the coil is immersed in an acid solution that dissolves molybdenum but does not dissolve tungsten, and the primary mandrel wire 11 and the secondary mandrel wire 14 formed from molybdenum are dissolved and removed, whereby the third coil 17 is removed. Composed.

  The third coil 17 formed in this way, that is, a triple coil, is erected between the tips of a pair of internal lead-in wires 41 introduced through the stem 21 in an airtight manner into the glass bulb 2, and an electron-emitting substance ( (Emitter) is deposited. The electron radioactive substance is composed mainly of oxides of barium (Ba), strontium (Sr), and calcium (Ca). This electron emitting material is filled and applied in the space formed by the first coil 13 and the second coil 15, that is, between the pitch and the winding turn, by immersing the triple coil in a carbonate solution of the electron emitting material. It is deposited by drying.

  In the electrode 4 configured as described above, when the volume of the inner space of the triple coil, that is, the so-called basket volume is increased to increase the amount of the electron-emitting material deposited on the coil, The dimensional relationship is set to a predetermined value so that the temperature of the electrode is ensured and the specified value defined by the JIS standard is satisfied in the characteristics of the filament.

Specifically, the wire diameter D ₁ of the main wire 10 is 0.050 to 0.063 mm, the wire diameter MD ₁ of the primary mandrel wire 11 is 0.07 to 0.13 mm, and the wire of the secondary mandrel wire 14 is. diameter MD ₂ is 0.20～0.35Mm, first coil pitch _{P 1} is set to 0.07～0.13Mm.

Incidentally, wire diameter _{D 1} of the auxiliary wire 12 is 0.016～0.020Mm, second coil pitch _{P 2,} the size range of 0.270~0.410mm is preferred. These values are derived based on the test and measurement results described later.

  Next, when manufacturing the electrode 4 according to the present embodiment, the inventors increase the basket volume to increase the amount of the electron-emitting material deposited on the coil, thereby realizing a longer life. Various dimensional relationships were set, and tests and measurements were performed.

  The results are shown in the following table, and Tables 1 to 4 show typical examples of the present embodiment and the comparative example. In the present embodiment and the comparative example, both attempt to increase the deposition amount of the electron-emitting material by increasing the basket volume as compared with the prior art.

The material data, have the same size in both the embodiment and the comparative example, the wire diameter _{D 1} of the main wire 10 0.0585Mm, wire diameter _{D 2} of the auxiliary wire 12 0.0182Mm, wire diameter of the primary mandrel wire 11 MD ₁ is 0.0935 mm, the wire diameter MD ₂ of the secondary mandrel wire 14 is 0.3379 mm, and the wire diameter MD ₃ of the tertiary mandrel wire 16 is 1 mm.

The coiling data, and the comparative example with the present embodiment, although first coil pitch P ₁ is different, the other dimensions and the like are the same. In the present embodiment, with respect to first coil pitch _{P 1} that is 0.0990Mm, in the comparative example, a 0.0600Mm. Second coil pitch _{P 2} is, 0.3125Mm, third coil pitch _{P 3} is, 1 mm, a third coil turn number N, i.e., the number of turns is four turns.

The mounting data is the same size in both the embodiment and the comparative example, clamp width _{L 1} is 7.5 mm, the emitter uncoated width _{L 2} is 1.5 mm. Clamp width L ₁ is a dimension between the internal lead wire 41 inside the coil is clamped to the internal lead wire 41 as shown in FIG. Emitter uncoated width L ₂ is a predetermined width emitter is not applied from the internal lead wire 41 inner end.

The comparative example with the present embodiment as described above, the dimensional have different only first coil pitch P _1, in the present embodiment, first coil pitch P ₁ is larger compared with the comparative example.

The electrode characteristic values are 2.35 Ω and 2.37 Ω for the cold resistance values Rc of the present embodiment and the comparative example, respectively, and the basket volume Bv is 5.49 mm ³ in the present embodiment as a calculated value. 41mm ^3. In this case, the difference is slight and may be considered equivalent.
The temperature resistance value Rh and the resistance ratio Rh / Rc are 11.1Ω and 4.72 in the present embodiment, and 9.76Ω and 4.12 in the comparative example.

  Here, the cold resistance value Rc is a resistance value when a minute current (for example, 5 mA) that does not change the resistance value of the electrode is passed. The temperature resistance value Rh is a resistance value when a current of 370 mA is passed through the electrode as a test current, and the resistance ratio Rh / Rc is a value obtained by dividing the temperature resistance value Rh by the cold resistance value Rc.

  By the way, in the case of FHF32, according to JIS standard JIS C 7617-2 (straight tube fluorescent lamp-part 2: performance specification), the temperature resistance value Rh at a test current of 370 mA is defined as 8 to 14Ω. Although not standardized at present, the resistance ratio Rh / Rc is determined to be 4.75 ± 0.5 in JIS C 7618-2 (single-piece fluorescent lamp-part 2: performance specifications). Standardization is also assumed in JIS C 7617-2, which is a standard for straight tube fluorescent lamps. In order to conform to the JIS standard in the future, it is considered necessary to be within these ranges.

  Therefore, when comparing this embodiment and the comparative example with the JIS standard and the resistance ratio range where JIS standardization is assumed, in the comparative example, the resistance ratio Rh / Rc is within the range where JIS standardization is expected. Not in. On the other hand, in the present embodiment, the resistance ratio Rh / Rc is within the range where JIS standardization is assumed, and it will conform to the JIS standard in the future.

This is a comparative example with the present embodiment, the basket volume Bv is equivalent, material data, coiling and from the data and mounting data due because except first coil pitch P ₁ is the same as first coil pitch P ₁ I understand that

In other words, by increasing the first coil pitch P ₁ in the filament as the electrode, to reduce the heat capacity of the filament, ensuring the Atsushi Nobori by suppressing the heat absorption by the auxiliary wire 12, temperature resistance value Rh is greater as the temperature increase As a result, the resistance ratio Rh / Rc falls within the range defined by the JIS standard and can be adapted.

Therefore, in this embodiment, even when the basket volume Bv is increased and the deposition amount of the electron radioactive material deposited on the coil is increased, the first coil pitch P ₁ is set to a predetermined value (0.07 to 0). .13 mm), a configuration that can be adapted to the JIS standard has been found.

  Next, the illumination device 20 to which the fluorescent lamp 1 is mounted will be described with reference to FIG. The illuminating device 20 is a ceiling-mounted fluorescent lamp fixture, and has a device main body 21, and lamp sockets 22 are provided opposite to both end portions on the lower surface side of the device main body 21. Two fluorescent lamps 1 are electrically and mechanically mounted between the lamp sockets 22. A lighting device 23 for lighting the fluorescent lamp 1 is housed in the device main body 21.

  The lighting device 23 is configured, for example, by connecting an inverter circuit that generates a high frequency of 40 kHz or more to a DC power source obtained by rectifying and smoothing a commercial AC power source. This inverter circuit is connected to the electrode 4 of the fluorescent lamp 1 via an inverter transformer or the like.

  When the fluorescent lamp 1 is lit, the DC voltage of the DC power supply is converted into high frequency alternating current by an inverter circuit, and the voltage 4 is applied between the electrodes 4 of the fluorescent lamp 1 while the electrodes 4 of the fluorescent lamp 1 are preheated. .

When the fluorescent lamp 1 is turned on, the lamp current is 0.25 to 0.45 A. For example, the lamp power is 32 W during rated lighting, the lamp current is 0.255 A, and the lamp power is 45 W during high output lighting. The lamp current is 0.425A.
In addition, such a fluorescent lamp 1 can have a rated life of 18000 hours or more, and can extend its life.

  As described above, according to the present embodiment, the volume of the electrode 4 is increased to increase the deposition amount of the electron radioactive substance, and the temperature rise of the electrode 4 when a current is passed can be secured, thereby extending the life. It is possible to provide the discharge lamp electrode 4, the high-frequency lighting-use fluorescent lamp, and the lighting device 20 that can be achieved and can be adapted to the JIS standard.

1 ... fluorescent lamp, 2 ... glass bulb,
3 ... phosphor layer, 4 ... electrode, 5 ... base,
10 ... main wire, 11 ... primary mandrel wire,
12 ... subwire, 13 ... first coil,
14 ... secondary mandrel wire, 15 ... second coil,
16 ... tertiary mandrel wire, 17 ... third coil,
21 ... Stem, 41 ... Internal lead-in wire

Claims (3)

  The main wire diameter is 0.050 to 0.063 mm, the primary mandrel wire diameter is 0.07 to 0.13 mm, the secondary mandrel wire diameter is 0.20 to 0.35 mm, and the first coil pitch by winding the sub wire is 0. An electrode for a discharge lamp having a thickness of 0.07 to 0.13 mm and comprising a triple coil to which an electron-emitting material is deposited.   A fluorescent lamp for high-frequency lighting, comprising the discharge lamp electrode according to claim 1, wherein the lamp is lit at a rated lamp current of 0.25 to 0.45 A and a frequency of 40 kHz or more. A lighting device body;
The high-frequency lighting-only fluorescent lamp according to claim 2 attached to the main body;
A lighting device for lighting this high-frequency lighting dedicated fluorescent lamp;
An illumination device comprising:

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