JP3879299B2 - Electrodeless discharge lamp device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention does not have an electrode in a bulb in which a discharge gas is sealed, and causes the discharge gas to act by applying a high-frequency electromagnetic field formed by energizing a high-frequency current to an induction coil disposed in the vicinity of the bulb. The present invention relates to an electrodeless discharge lamp device for discharging.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, an electrodeless discharge lamp is known that excites a discharge gas by applying a high-frequency electromagnetic field to the discharge gas sealed in the bulb. This type of electrodeless discharge lamp has features such as small size, high output, and long life, and has been researched and developed in various places.
[0003]
As an electrodeless discharge lamp device for lighting this type of electrodeless discharge lamp, one having a configuration as shown in FIG. 6 is known. The electrodeless discharge lamp 1 includes a bulb 1a made of a translucent material such as glass in which a discharge gas of several Torr made of mercury vapor and a rare gas (for example, argon) is sealed, and several turns on the outer peripheral surface of the bulb 1a. The induction coil 2 is wound in close proximity.
[0004]
The induction coil 2 is supplied with a high frequency current from a high frequency power source (not shown). Here, the frequency of the high-frequency current supplied to the induction coil 2 is mainly set to 13.56 MHz. The discharge gas is adjusted so as to mainly generate (emit light) ultraviolet rays (main wavelength 254 nm), and the phosphor layer 4 is formed on the inner peripheral surface of the bulb 1a.
[0005]
In this electrodeless discharge lamp device, a high frequency current is passed through the induction coil 2 by a high frequency power source to generate a high frequency electromagnetic field around the induction coil 2 and the discharge gas in the bulb 1a is excited and discharged. Ultraviolet light generated by the discharge is converted into visible light by the phosphor layer 4 and emitted.
[0006]
By the way, between the high frequency power source and the induction coil 2, in order to efficiently supply the high frequency current generated by the high frequency power source to the induction coil 2, the high frequency power source and the lamp unit including the induction coil 2 and the bulb 1 a are matched. For this purpose, a matching circuit (not shown) for matching the impedance between the high-frequency power source and the induction coil 2 is inserted. The matching circuit is designed in consideration of variations in the characteristics of the high-frequency power supply and the characteristics of the lamp portion, and is adjusted when the electrodeless discharge lamp device is manufactured. Here, a change in the impedance of the induction coil 2 is one of the factors that change the characteristics of the lamp portion including the induction coil 2 and the bulb 1a. The impedance of the induction coil 2 varies depending on the winding diameter, the number of turns, the winding method, the winding shape, etc. of the coil wire of the induction coil 2.
[0007]
The above-described high-frequency power supply and matching circuit are housed in a metal case 6 ′ to which the lamp portion is mounted, and a hemispherical shield cage 10 surrounding the lamp portion is attached to the case 6 ′.
[0008]
[Problems to be solved by the invention]
By the way, in the electrodeless discharge lamp device having the above-described conventional configuration, impedance matching between the high frequency power source and the lamp unit is achieved by adjusting the matching circuit at the time of manufacture, but a member for holding the induction coil 2 is provided. Therefore, depending on the external force, the weight of the induction coil 2 or the installation state, the winding diameter and the winding shape of the induction coil 2 may change depending on the weight of the valve 1a, and the characteristics of the induction coil 2 may change. there were. On the other hand, the matching circuit is designed in consideration of variations in the characteristics of the high-frequency power supply and the lamp unit as described above. However, if the variation in the characteristics of the induction coil 2 is large, the variable range of the characteristics of the matching circuit is increased. In other words, there is a problem that the size of the apparatus is increased and the cost is increased, and further, the design of the matching circuit becomes difficult.
[0009]
The present invention has been made in view of the above reasons, and an object of the present invention is to provide an electrodeless discharge lamp device in which the characteristics of the induction coil are small and the matching circuit can be easily designed.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the invention of claim 1 provides a light-transmitting bulb in which a discharge gas is sealed, a bobbin whose inner surface is disposed close to the outer peripheral surface of the bulb, and the bobbin. A wound induction coil; a high-frequency power source that supplies a high-frequency current to the induction coil to excite the discharge gas to emit light; and a matching circuit that matches impedances of the high-frequency power source and the induction coil. The induction coil is provided with a notch through which the part of the coil wire is passed so that a part of the coil wire is in contact with the valve at a portion where the coil wire of the induction coil is wound. Is wound around the bobbin, so that changes in the winding diameter and winding shape of the induction coil can be prevented, and variations in the characteristics of the induction coil are reduced. In addition, since a part of the coil wire of the induction coil contacts the bulb through the notch provided in the bobbin, the discharge start voltage, which is the voltage at both ends of the induction coil when the discharge starts, increases due to the influence of the bobbin. Can be prevented.
[0012]
Further, in the invention of claim 1, inductive coil, since the coil wire is wound to overlap in the radial direction of the bobbin, it is possible to reduce the axial dimension of the bobbin, the coil wire is of a bobbin If the overlapping in the axial direction are wound base ratio can be reduced eclipse by bobbin of light exiting from the valve, it is possible to increase the light extraction efficiency.
[0013]
Further, in the invention of claim 1, inductive coils, so connected to the hot line side of the high-frequency power supply via a matching circuit lead lines from the portion located inside in the radial direction, an increase in discharge starting voltage Can be prevented.
[0014]
The invention of claim 2 is the invention of claim 1, wherein the coil wire is made of stranded wire, so that the resistance of the induction coil can be reduced as compared with the case where the coil wire of the induction coil is a single wire, and the loss due to the resistance Can be reduced.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
(Reference example)
As shown in FIG. 1, the electrodeless discharge lamp apparatus of this reference example is made of a rare gas such as argon or krypton and mercury vapor in an airtight space inside a bulb-shaped bubble 1a made of glass (so-called PS type). A discharge gas is enclosed, and a phosphor layer 4 is formed on the inner surface of the bulb 1a. A bobbin 3 whose inner surface is close to the outer peripheral surface of the valve 1a is disposed outside the valve 1a. An induction coil 2 is wound around the bobbin 3. The bulb 1a and the induction coil 2 constitute a lamp part.
[0016]
Further, the electrodeless discharge lamp apparatus of the present reference example includes a metal case 6 in which a support 5 supporting the bobbin 3 is projected, and a high-frequency power source (not shown) that supplies a high-frequency current to the induction coil 2. I have. In addition, a matching circuit 7 for matching the impedance between the high frequency power source and the induction coil 2 is inserted between the high frequency power source and the induction coil 2 in order to efficiently supply the high frequency current generated by the high frequency power source to the induction coil 2. Has been. Here, the matching circuit 7 is housed in the case 6 described above, and is connected to a high frequency power source provided outside the case 6 by connection means such as a coaxial cable 11. The matching circuit 7 is connected to a lead wire 9 of the induction coil 2 wound around the bobbin 3.
[0017]
By the way, the bobbin 3 is formed of a non-metallic material, for example, PET (polyethylene terephthalate) or the like. As shown in FIG. 2, the bobbin 3 is cylindrical and has both ends of a winding drum portion 32 around which the induction coil 2 is wound. 2, that is, flanges 31 are provided at both ends of the bobbin 3 in the axial direction (vertical direction in FIG. 1). Here, the inner diameter of the bobbin 3 is formed to have a dimension substantially equal to the maximum diameter of the valve 1 a on the surface orthogonal to the axial direction of the bobbin 3.
[0018]
On the other hand, as shown in FIGS. 2 and 3, the induction coil 2 wound around the bobbin 3 is arranged in the axial direction of the bobbin 3 so that the coil wire does not overlap the radial direction of the bobbin 3 (left and right direction in FIG. 3). They are wound in layers (winded in a so-called single-layer solenoid). Further, as shown in FIG. 2, a notch portion 8 is formed in the winding body portion 32 of the bobbin 3 along the circumferential direction, and the coil wire of the induction coil 2 wound around the winding body portion 32 is formed. A part is straight and protrudes inside the bobbin 3. Here, the notch 8 is provided so that a part of the coil wire of the induction coil 2 can contact the valve 1a. The lead wire 9 from the portion wound around the bobbin 3 of the induction coil 2 is connected to the matching circuit 7 in the case 6 as described above.
[0019]
In this reference example, since the induction coil 2 is wound around the bobbin 3, the winding diameter or winding of the induction coil 2 depends on the external force, the weight of the induction coil 2, or the weight of the valve 1a depending on the installation state. The shape and the like can be prevented from changing, and variations in the characteristics of the induction coil 2 are reduced, so that the matching circuit 7 can be easily designed. Further, when the induction coil 2 is wound around a bobbin not provided with the above-described notch 8, the induction coil 2 does not come into contact with the bulb 1a, so that the discharge starts as a voltage across the induction coil 2 when the discharge starts. The voltage will rise. On the other hand, in this reference example, a part of the coil wire of the induction coil 2 comes into contact with the bulb 1a through the notch 8 provided in the bobbin 3, so that the discharge start voltage is prevented from rising due to the influence of the bobbin 3. It is possible to start the electrodeless discharge lamp 1 stably. In short, in this reference example, the induction coil 2 having stable characteristics can be produced without affecting the discharge start voltage, and as a result, the characteristics of the induction coil 2 are stabilized, and the matching circuit 7 can be easily designed. .
[0020]
In this reference example, since the coil wire is wound in the axial direction of the bobbin 3 in the induction coil 2, the winding diameter and shape of the induction coil 2 are stabilized, and the characteristics of the induction coil 2 are improved. Stabilize. Furthermore, since the bobbin 3 is supported (fixed) by the support column 5, the positional relationship between the induction coil 2 and the valve 1a is also stabilized, and the characteristics of the induction coil 2 are further stabilized.
[0021]
Note that the shape of the bobbin 3 is not limited to a cylindrical shape, and may be a cylindrical shape having a polygonal opening surface.
[0022]
(Embodiment 1 )
The basic configuration of the electrodeless discharge lamp device of the present embodiment is substantially the same as the reference example shown in FIG. 1, and as shown in FIGS. 4 and 5, the axial dimension of the winding body portion 32 of the bobbin 3 is set. It is characterized in that the coil wire is overlapped and wound in the radial direction of the bobbin 3 (left and right direction in FIG. 5) in accordance with the thickness of the coil wire of the induction coil 2. The other components are the same as those in the reference example shown in FIG. In addition , the same components as those in the reference example are denoted by the same reference numerals and description thereof is omitted.
[0023]
Of the pair of lead wires 9 of the induction coil 2, the lead wire 9 (the right lead wire 9 in FIG. 4) from the portion located inside in the radial direction is an insertion hole provided in the flange portion 31 of the bobbin 3. (Not shown) or through a notch (not shown). Here, the lead wire 9 from the portion located inside in the radial direction is connected to the live line side (non-grounded side) of the matching circuit 7 (see FIG. 1) described in the reference example . In short, the lead line 9 is connected to the live line side of the high-frequency power source via the matching circuit 7.
[0024]
In the present embodiment, since the induction coil 2 is wound around the bobbin 3, the winding diameter or winding of the induction coil 2 depends on the external force, the weight of the induction coil 2 or the weight of the valve 1a depending on the installation state. The shape and the like can be prevented from changing, and variations in the characteristics of the induction coil 2 are reduced, so that the matching circuit 7 can be easily designed. Further, when the induction coil 2 is wound around a bobbin not provided with the above-described notch 8, the induction coil 2 does not come into contact with the bulb 1a, so that the discharge starts as a voltage across the induction coil 2 when the discharge starts. The voltage will rise. On the other hand, in this embodiment, since a part of the coil wire of the induction coil 2 contacts the bulb 1a through the notch 8 provided in the bobbin 3, the discharge start voltage is prevented from rising due to the influence of the bobbin 3. The electrodeless discharge lamp 1 can be started stably. In short, in the present embodiment, the induction coil 2 having stable characteristics can be made without affecting the discharge start voltage. As a result, the characteristics of the induction coil 2 are stabilized, and the matching circuit 7 can be easily designed.
[0025]
In the present embodiment, the coil 2 is wound in the radial direction of the bobbin 3 in the induction coil 2, so that the axial dimension of the bobbin 3 can be reduced compared to the reference example . Compared with the reference example, the light emitted from the bulb 1a can be reduced by the bobbin 3, and the light extraction efficiency can be increased.
[0026]
In addition, the induction coil 2 is wound with the coil wires overlapped in the radial direction, and the lead wire 9 from the portion located inside in the radial direction is connected to the live line side of the high-frequency power source via the matching circuit 7. Since it is connected, the hot wire side of the induction coil 2 comes into contact with the bulb 1a, and an increase in the discharge start voltage can be prevented.
[0027]
(Embodiment 2 )
Electrodeless discharge lamp device of the present embodiment, in the configuration of Embodiment 1 is characterized in that it uses a stranded wire instead of a single wire as a coil wire of the induction coil 2, other configurations are the same as Embodiment 1 Therefore, illustration and description are omitted.
[0028]
By the way, in the electrodeless discharge lamp apparatus, a large high-frequency current flows through the induction coil 2, so that the current density of the induction coil 2 increases due to the skin effect. Therefore, in order to reduce the loss due to the resistance of the induction coil 2, it is desirable to make the thickness of the coil wire as thick as possible. However, when the coil wire becomes thick, there is a problem that it is difficult to form the induction coil 2 with a single wire. Further, in the electrodeless discharge lamp device having the conventional configuration described with reference to FIG. 6, it is conceivable to use a stranded wire that is thick and has a small resistance component and is easy to mold, as the coil wire of the induction coil 2. There is a problem that the shape of the induction coil 2 is not stable.
[0029]
On the other hand, in this embodiment, by using a stranded wire as the coil wire of the induction coil 2, the resistance of the induction coil 2 is reduced as compared with the case where the coil wire is a single wire without impairing the formability of the induction coil 2. Since the coil wire is wound around the bobbin 3, the shape of the induction coil 2 is stable, and the same effect as in the first embodiment can be obtained.
[0030]
Incidentally, it is needless to say that may be used stranded wire as a coil wire of the induction coil 2 which definitive Reference Example.
[0031]
【The invention's effect】
The invention of claim 1 is a light-transmitting bulb in which a discharge gas is enclosed, a bobbin having an inner surface disposed close to the outer peripheral surface of the bulb, an induction coil wound around the bobbin, A high-frequency power source that supplies a high-frequency current to the induction coil to excite and emit the discharge gas; and a matching circuit that matches impedances of the high-frequency power source and the induction coil, and the bobbin is wound by the coil wire of the induction coil Since the notched portion through which the part of the coil wire passes is provided so that a part of the coil wire is in contact with the valve, the winding diameter of the induction coil is reduced when the induction coil is wound around the bobbin. Since the variation in the characteristics of the induction coil is reduced, the matching circuit can be easily designed, and a part of the coil wire of the induction coil is provided on the bobbin. Since contact with the valve through the notch, the voltage across which the discharge start voltage of the induction coil when the discharge starts there is an effect that it is possible to prevent the increase in the influence of the bobbin.
[0033]
Further, in the invention of claim 1, inductive coil, since the coil wire is wound to overlap in the radial direction of the bobbin, it is possible to reduce the axial dimension of the bobbin, the coil wire is of a bobbin If the overlapping in the axial direction are wound base ratio can be reduced eclipse by bobbin of light exiting from the valve, there is an effect that it is possible to enhance the light extraction efficiency.
[0034]
Further, in the invention of claim 1, inductive coils, so connected to the hot line side of the high-frequency power supply via a matching circuit lead lines from the portion located inside in the radial direction, an increase in discharge starting voltage There is an effect that it can be prevented.
[0035]
The invention of claim 2 is the invention of claim 1, wherein the coil wire is made of stranded wire, so that the resistance of the induction coil can be reduced as compared with the case where the coil wire of the induction coil is a single wire, and the loss due to the resistance There is an effect that can be reduced.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing a reference example .
FIG. 2 is a perspective view of the bobbin shown above and wound with an induction coil.
3 is a cross-sectional view of the main part of FIG. 2, showing the same as above. FIG.
Figure 4 shows an embodiment 1 is a perspective view of a bobbin which induction coil is wound.
5 is a cross-sectional view of the main part of FIG. 4, showing the same as above. FIG.
FIG. 6 is a schematic configuration diagram showing a conventional example.
[Explanation of symbols]
1a valve 2 induction coil 3 bobbin 4 phosphor layer 5 support 6 case 7 matching circuit

Claims (2)

A light-transmitting bulb in which discharge gas is sealed; a bobbin whose inner surface is disposed close to the outer peripheral surface of the bulb; an induction coil wound around the bobbin; and a high-frequency current applied to the induction coil A high-frequency power supply for exciting the discharge gas to emit light and a matching circuit for matching impedances of the high-frequency power supply and the induction coil, and the bobbin is provided with a coil wire at a portion around which the coil wire of the induction coil is wound. partially cutout portion through which the portion of the coil wire is provided et been in contact with the valve, the induction coil, the coil wire is wound to overlap in the radial direction of the bobbin, positioned inside in the radial direction An electrodeless discharge lamp device comprising: a lead- out line from a portion connected to a live line side of a high-frequency power source through a matching circuit . 2. The electrodeless discharge lamp device according to claim 1, wherein the coil wire is made of a stranded wire .

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