JP2000277281A - Electrodeless discharge lamp device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrodeless discharge lamp device which is superior in mass-productivity and has an inexpensive and rational configuration. SOLUTION: An electrodeless discharge lamp device is structured, so that a discharge gas is encapsulated in an arc tube 1 and a phosphor is applied to the inner surface. A print coil 2 consisting of a coil conductor 6, provided on the surface and a printed circuit board furnished with peripheral circuits, is installed near the arc tube 1, and inside the tube 1, a high-frequency plasma tube is produced by a high-frequency electromagnetic field generated around the print coil 2, and the ultraviolet rays emitted causes the phosphor to excite and emit light.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrodeless discharge lamp device having good mass productivity, and in particular, to manufacture a discharge lamp driving coil by a printed circuit board technology and to form a peripheral circuit on the same substrate. The present invention relates to an electrodeless discharge lamp device having improved mass productivity by configuring the above.

[0002]

2. Description of the Related Art FIG. 15 is a view showing a conventional example of an electrodeless discharge lamp device. In FIG. 15, reference numeral 1 denotes an arc tube 1 (electrodeless discharge lamp), 201 denotes an arc tube lighting coil, 203 denotes a power supply line of the arc tube lighting coil 201, and 202 denotes an arc tube lighting coil 201, which is fixed to the arc tube 1. The adhesive used to
Reference numeral 5 denotes a housing for a high-frequency power supply and a matching circuit. The arc tube lighting coil 201 constitutes a resonance circuit that resonates with the (basic) frequency of the high-frequency power supply together with the capacitor provided in the storage section 5. A discharge gas is sealed in the inside of the arc tube 1 and a phosphor is applied to the inner surface, and a high-frequency electromagnetic field induced in the arc tube lighting coil 201 arranged close to the arc tube 1 causes A high-frequency plasma ring is generated inside the arc tube 1, and ultraviolet rays emitted from the ring excite the phosphor to emit light.

[0003]

As described above, the arc tube lighting coil 201 is formed by using the printed circuit board technology, and a thin coil is used to reduce the shielding area of the lamp light emitting portion. Japanese Patent Application Laid-Open No. 6-251753 suggests that heat is more efficiently dissipated using an expensive aluminum nitride substrate. However, although the coil is formed on the aluminum nitride substrate in the conventional example, it is necessary to provide a peripheral circuit separately, and this substrate is not used effectively, which is irrational because the cost is increased.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electrodeless discharge lamp device which is excellent in mass productivity, inexpensive and has a reasonable configuration.

[0005]

According to the first aspect of the present invention, a discharge gas is sealed therein.
A light-emitting tube having an inner surface coated with a phosphor, a light-emitting tube lighting coil disposed in close proximity to the light-emitting tube, and a high-frequency power supply for supplying a high-frequency current to the light-emitting tube lighting coil; Due to the high frequency electromagnetic field generated in the tube lighting coil,
In an electrodeless discharge lamp device in which ultraviolet light emitted from a high-frequency plasma ring generated inside the arc tube excites the phosphor to emit light, a conductor foil is formed on a dielectric substrate as the arc tube lighting coil. Wherein a printed circuit board on which a coil conductor is formed is used, and at least a part of a pattern of an impedance matching circuit or a circuit element pattern is formed on the printed circuit board.

For this reason, it is possible to suppress the variation of the coil which causes the variation of the tuning frequency tuned to the fundamental frequency of the high-frequency power source, so that the mass productivity is improved and the area of the arc tube for shielding heat or light. In addition, by mounting a matching circuit on a printed circuit board, it is possible to minimize the area of the circuit section through which the main resonance current flows, and thus reduce the circuit loss.
At the same time, unnecessary radiation from the coil conductor can be reduced, and by forming the coil conductor and a pattern such as a matching circuit on the same substrate, it is reasonable and the cost can be reduced.

According to a second aspect of the present invention, in the first aspect of the present invention, the arc tube lighting coil is formed of a resin dielectric multilayer printed board. For this reason, a coil that is highly accurate and suitable for mass production can be realized using a lightweight resin dielectric multilayer printed circuit board with low high-frequency loss.

According to a third aspect of the present invention, in the first aspect of the present invention, the arc tube lighting coil is formed of an inorganic dielectric multilayer printed circuit board. For this reason, it is possible to realize a coil that is highly accurate and suitable for mass production using a printed circuit board that is inexpensive and has a high dielectric constant.

Further, the present invention does not use an expensive aluminum nitride substrate having good thermal conductivity as in the prior art, but uses a substrate according to the second and third aspects of the present invention to rationalize the driving circuit of the electrodeless discharge lamp. I'm trying.

According to a fourth aspect of the present invention, in the second or third aspect of the present invention, an insulator layer of the multilayer printed board is disposed on an outermost layer of the multilayer printed board constituting the arc tube lighting coil; It is characterized in that the coil conductor is used as protection means. Since the outermost layer is used as an insulator layer and used as a rust-proof, moisture-proof, and other protective layer for the coil conductor using a multilayer substrate structure, there is no need for insulating coating or the like, and mass productivity is improved.

According to a fifth aspect of the present invention, in the second or third aspect of the present invention, a resin solder resist material is disposed on the outermost layer of the multilayer printed circuit board constituting the arc tube lighting coil to form an insulator layer. And a protection means for the coil conductor. Therefore, protection of the coil conductor can be realized at low cost.

According to a sixth aspect of the present invention, in the first aspect of the present invention, the tuning circuit tunes at least to the fundamental frequency of the high frequency power supply together with the coil conductor on a printed circuit board constituting the arc tube lighting coil. Is constituted. For this reason, the area of the circuit section through which the main resonance current flows can be minimized, so that the circuit loss is reduced, and at the same time, unnecessary radiation from the coil conductor can be reduced.

According to a seventh aspect of the present invention, in the sixth aspect of the present invention, as the means for adjusting the tuning frequency of the tuning circuit, a laser trimmable capacitor capable of laser trimming is mounted on the printed circuit board. Features. Therefore, the tuning frequency can be easily adjusted.

In the invention of claim 8, in the invention of claim 6, as means for adjusting a tuning frequency of the tuning circuit, a part of a coil conductor pattern or a capacitor pattern constituting the tuning circuit is selectively provided. A selective connection portion is provided on the printed conductor pattern of the printed circuit board so as to enable removal or connection. Therefore, the tuning frequency can be adjusted.

According to a ninth aspect of the present invention, in the first aspect of the present invention, the unbalanced output circuit of the high-frequency power source is converted to a balanced type on a printed circuit board constituting the arc tube lighting coil. A balance-unbalance conversion circuit for connecting to an arc tube lighting coil is provided. For this reason, it becomes difficult for the common mode noise current to flow through the arc tube lighting coil, and unnecessary radiation of the noise component can be suppressed.

According to a tenth aspect of the present invention, in the ninth aspect of the present invention, the lead line from the coil conductor pattern is led out to a convex portion provided on a part of the printed circuit board, and A common mode choke coil is formed through a ferrite core. For this reason, unnecessary radiation due to the normal mode current of the coil conductor can be suppressed to a minimum, and drive power can be transmitted by a coaxial cable that is inexpensive and has stable characteristics. Become.

According to the eleventh aspect of the present invention, in the first aspect of the present invention, the impedance matching circuit is provided in an empty area on the same substrate surrounded by a coil conductor of a printed circuit board constituting the arc tube lighting coil. An independent matching circuit board including at least a part thereof is arranged and configured to be shared. For this reason, the space inside the coil conductor of the printed circuit board that constitutes the coil is unnecessary and is unused space, but this space can be effectively used as an independent matching circuit board and low cost is realized. it can.

According to the twelfth aspect of the present invention, the eleventh aspect is provided.
In the invention, a holding portion for inserting and holding a ferrite core is provided in at least a part of the impedance matching circuit so as to form a common mode choke coil. For this reason, it is possible to effectively block the common mode current to the coil conductor.

[0019]

(Embodiment 1) FIG. 1 (a) shows the overall configuration of an electrodeless discharge lamp device corresponding to Embodiment 1 of the present invention. In FIG. 1A, reference numeral 2 denotes a printed coil which is an arc tube lighting coil formed of an alumina ceramic multilayer substrate, and reference numeral 3 denotes a substantially U-shaped silicone rubber pad shown in FIG. It is inserted between the arc tube 1 and the print coil 2 to prevent the arc tube 1 from being damaged and to fix the relative position between the arc tube 1 and the print coil 2. Reference numeral 4 denotes a coaxial cable for feeding power from the storage unit 5 to the print coil 2. The coil conductor 6 is formed on the printed coil 2 by a conductor foil as described later. In FIG. 1, the same components as those in FIG. 15 showing the conventional example are denoted by the same reference numerals.

With such a configuration, the deformation of the coil can be prevented as compared with the case of using a wound coil as shown in FIG. 15, so that the inductance of the coil is stabilized and the appearance is elegant. Furthermore, the printed coil 2 is characterized by high precision and good mass productivity because the coil conductor is manufactured by a precision etching technique. Further, since the end surface (thickness portion) of the substrate of the printed coil 2 faces the arc tube 1, the amount of light shielding from the arc tube 1 can be reduced.

An organic material substrate can be used in addition to an inorganic material substrate. However, when an alumina ceramic substrate is used as in this embodiment, a high dielectric constant (ε ≒ 10) is required.
The interlayer capacitance of the coil can be selected to be large, and the opposing area of the coil can be adjusted to be used as all or part of the resonance capacitance. Alumina ceramic substrates are inexpensive. In addition, since the ceramic substrate withstands severe environmental conditions such as ultraviolet rays and heat, it is suitable for application to a long-life device such as an electrodeless discharge lamp.

FIG. 2 is a diagram showing the detailed configuration of the printed coil 2, in which the conductor foil portion and the base material portion of the printed board are separately illustrated. The printed coil 2 has a coil conductor 9 made of a conductor foil on the first layer from the top, and an alumina ceramic substrate 12 and 3, which are dielectric substrates on the second layer.
It is composed of a coil conductor 17 made of a conductor foil in the layer, and is composed of an alumina ceramic substrate which is an inorganic dielectric multilayer printed circuit board. Reference numeral 10 denotes a through-hole hole for externally connecting the lead line 9a of the coil conductor 9 formed in a hollow substantially circular shape, and 18 denotes a lead line 17a of the coil conductor 17 formed in a hollow substantially circular shape. Through hole for external connection.

Reference numeral 14 denotes external connection terminal tabs for the coil conductors 9 and 17 which are hollow and project from the periphery of the substantially circular alumina ceramic base material 12, and are electrically connected to the through-hole holes 10 and 18. And through holes 15 and 16 connected to the outside. The first-layer coil conductor 9 is provided with a through-hole 11, and the third-layer coil conductor 17 is provided with a through-hole 19. The second-layer alumina ceramic substrate is formed by the through-holes 11 and 19. The coil conductors 9 and 17 are electrically connected through through holes 13 provided in the material 12. In the illustrated example, a two-turn coil is formed using a double-sided board. However, in the case of an N-turn coil, a multilayer board having (N + 1) layers can be used in accordance with electrical conditions. Further, a resin dielectric multilayer printed board such as a fluororesin board may be used as the printed coil 2.

FIG. 3A is a view showing a cross section of the printed coil 2 shown in FIG. 2, wherein reference numeral 21 denotes a coil conductor made of a first-layer conductor foil, and reference numeral 20 denotes a second-layer dielectric alumina ceramic base material. The alumina ceramic layer 22 is a coil conductor made of a third-layer conductor foil. Coil conductors 21, 22
In the case where is copper, oxidation proceeds when exposed to a high temperature of 80 ° C. or more, so an example as shown in FIG. In FIG. 3B, reference numerals 23 and 24 denote insulating layers as protection means disposed on the outermost layer, and coil conductors 21 and 22 are provided on the inner layer. Since the coil conductors 21 and 22 disposed in the inner layer are protected around by the insulator layers 23 and 24, there is an advantage that there is no danger of oxidation and scratches. FIG. 3C shows another example of the printed coil 2. In order to realize the same effect as the example shown in FIG.
The coil conductors 21 and 22 are protected by an insulator layer composed of solder resist resin layers 25 and 26, which is a resin solder resist material as a protection means.

Next, FIG. 4 shows an electrical configuration of the printed coil and its peripheral circuits. In FIG. 4, reference numeral 27 denotes a coil portion formed of a coil conductor formed on a printed circuit board.
Reference numeral 28 denotes a semi-fixed capacitor that constitutes a parallel resonance circuit that is a tuning circuit that tunes to a fundamental frequency of a high-frequency power supply (not shown) together with the coil unit 27. Reference numerals 29, 30, and 31 denote capacitors for impedance matching, respectively. The semi-fixed capacitor 28 is used to compensate for variations in the etching of the print coil, variations in the stray capacitance during assembly, and the like.

The capacitor 30 connects the unbalanced coaxial cable mode of the coaxial cable 33 for supplying the high-frequency power to the balanced coil of the coil unit 27, that is, converts the unbalanced output circuit of the high-frequency power supply to a balanced type, and It is a capacitor for balance-unbalance conversion which constitutes a balance-unbalance conversion circuit provided for connection to the lighting coil. As described above, in the connection terminal 32 of the coaxial cable 33 which is a connection portion of the unbalanced power supply line from the high frequency power supply, an impedance element having a value substantially equal to the impedance element connected in series to the center conductor is connected in series to the ground. By inserting, the unbalanced conversion becomes possible, and the common mode noise current hardly flows through the coil unit 27, and the unnecessary radiation is reduced.

FIG. 5 shows a specific configuration in which the electric circuit shown in FIG. 4 is mounted on a printed circuit board. In FIG. 5, reference numeral 34 denotes a ceramic multilayer substrate such as an alumina ceramic substrate constituting a printed coil. Although not shown, a coil conductor is provided as the coil portion 27 in FIG. 4 as shown in FIG. Reference numeral 36 denotes a through hole for connecting an interlayer coil of a multilayer coil conductor provided on both sides of the substrate as shown in FIG. Reference numeral 37 denotes a ceramic trimmer capacitor corresponding to the semi-fixed capacitor 28 in FIG.
Reference numerals 39 and 40 denote chip ceramic capacitors corresponding to the impedance matching capacitors 29, 30, and 31 in FIG. 4, and correspond to a part of the pattern of the impedance matching circuit and the circuit element pattern. Reference numerals 41 and 42 denote connection terminal holes for the coaxial cable 33. Reference numerals 43 and 44 denote mounting ears provided for holding the ceramic multilayer printed circuit board 34 horizontally, to which columns can be fixed.

Here, the semi-fixed capacitor 2 shown in FIG.
FIG. 6 shows an example in which a capacitor block composed of 8, capacitors 29, 30, and 31 is integrated into one and configured on a multilayer substrate.
Shown in Since the alumina substrate has a dielectric constant as large as about 10, an integrated capacitor can be formed using a multilayer substrate structure.

In FIG. 6A, A is a first common electrode plate, and B is a second common electrode plate. In the figure, the common electrode plates A and B are formed of conductor layers in the same plane. D is the third
Is a fourth common electrode plate, and each of the common electrode plates D and E is different from the common electrode plates A and B and is formed of a conductor layer in the same plane. 45, 46, 4
Reference numerals 7 and 48 denote external terminals, and reference numeral 49 denotes an alumina substrate having a multilayer substrate structure. FIG. 6B shows FIG.
FIG. 5A is a diagram showing an electrical relationship of the capacitor block shown in FIG. 5A, and shows that the electrode plates of the respective capacitors can be used as common electrode plates A, B, D, and E in a portion surrounded by an ellipse.

FIG. 7 shows a cross section of a conventionally used laser trimmable capacitor applied as the semi-fixed capacitor 28 constituting the tuning circuit shown in FIG. In the figure, reference numeral 50 denotes an electrode plate to be trimmed by a laser; 51, a dielectric ceramic; 52, an electrode plate connected to independent left and right electrodes 53, 54; And the electrode plates 50 and 5
2 produces a capacitance proportional to the opposing area. The laser trimmable capacitor is a means for adjusting the tuning frequency of the tuning circuit.

As another means for adjusting the tuning frequency of the tuning circuit, the structure of a variable capacitance element such as a selectively connectable capacitor is shown in FIG. FIG. 8B shows the electrical equivalent circuit of FIG. 8A, and the same components as those in FIG. 8A are denoted by the same reference numerals. In the figure, reference numeral 56 denotes one common electrode plate of the variable capacitance element,
Are connected to each other, and 57 is a dielectric of the variable capacitance element. The other electrode plate 5 of the variable capacitance element is sandwiched by the dielectric 57.
9, 60, 61 and 62 are arranged. In the example of this figure, the area of the electrode plates 59, 60, 61, 62 is 8: 4:
The electrode plates 59 and 6 have a ratio of 2: 1.
0, 61, 62 and selective connection portions 63,
By selectively separating 64, 65 and 66 respectively,
Sixteen variable capacitances represented by 4-bit binary numbers are obtained.

In this type of variable capacitance element, it is difficult to reconnect once the selective connection portions 63, 64, 65, 66 are disconnected once. For example, a connection portion to the external connection terminal 58 connected to the common line 68 is provided. After a gap 67 for separation is provided and adjusted in advance using another variable capacitance element (varicon, etc.), this capacitance value is normalized to a numerical value represented by 4 bits in a binary number, and for example, the capacitance value is represented by a binary number. Base 101
If it is 1, the selective connection portion 64 is cut off, and then the gap 67 is connected by solder or the like to make this variable capacitance element effective. As described above, a part of the capacitor pattern can be selectively removed or connected. However, in the coil conductor constituting the tuning circuit, the coil conductor pattern can be selectively removed or connected so that the tuning circuit can be removed. The tuning frequency may be adjusted.

(Embodiment 2) FIG. 9 shows an electrical configuration of a printed coil of an electrodeless discharge lamp device corresponding to Embodiment 2 and its peripheral circuits. In the figure, reference numeral 78 denotes a coil portion made of a coil conductor formed on a printed circuit board, and 69
Denotes a ferrite core 69 for blocking common mode noise described later. The coil portion 78 is connected to a tuning variable capacitor 71 via a coaxial cable 70 and connection terminals 76 and 77.
, And a series circuit of impedance matching capacitors 72 and 73 is connected to both ends. Also,
74 and 75 are connection terminals to a high-frequency power source (not shown) connected to both ends of the impedance matching capacitor 73.

FIG. 10 shows a printed circuit board on which the electric circuit shown in FIG. 9 is mounted. Numeral 88 denotes a multilayer printed board such as an alumina ceramic board, and a hollow circular coil board 88a provided with a coil conductor, not shown, such as a printed coil shown in FIG. A matching circuit board 83 provided with a matching circuit is provided in a vacant space in the inner central portion thereof. Also,
In order to mechanically connect the coil substrate 88a on the outer periphery of the multilayer printed circuit board 88 and the matching circuit substrate 83 on the inner side, four bridge portions 81 are provided at an intermediate portion. Reference numeral 82 denotes a through hole for connecting an interlayer coil of a multilayered coil conductor provided on both surfaces of the substrate as shown in FIG.

A protruding portion 79 protrudes from a part of the periphery of the multilayer printed board 88, and a ferrite core 69 shown in FIG. 9 is inserted into the protruding portion 79 to form a common mode choke coil serving as a common mode filter. . In this embodiment, different from those shown in FIGS. 4 and 5, the matching circuit including the impedance matching capacitors 72 and 73 is an unbalanced type, and the coil unit 78 is also driven unbalanced. In the case of such a driving method, the entire coil unit 78 operates as a grounded antenna, and the noise radiation increases. Such common mode noise is blocked by the common mode choke coil. That is, by inserting an element exhibiting high impedance with respect to the common mode into the convex portion 79, which is the neck portion of the multilayer printed circuit board 88, the noise emission from the coil portion 78 is prevented. Reference numeral 80 denotes a terminal portion for connecting the coaxial cable 70 shown in FIG. As shown in FIG. 2, the lead line of the coil conductor is led out to the terminal portion 80 from the convex portion 79, and is connected to the outside at the terminal portion 80.
Since the lead line passes through the ferrite core 69, a common mode filter is formed.

In FIG. 10, the matching circuit board 83 is co-produced from the same board by utilizing the sparse space at the center of the multilayer printed circuit board 88 as described above. Then, the above-mentioned bridge portion 81 is cut off and separated into two substrates. The matching circuit of the matching circuit board 83 at the center is shown in FIG.
The common part of the electrode plates of the tuning variable capacitor 71 and the impedance matching capacitor 72 shown in FIG.
The common portion of the electrode plates of the impedance matching capacitors 72 and 73 is formed by an electrode plate 85, and the common portion of the tuning variable capacitor 71 and the electrode plate of the impedance matching capacitor 73 is formed by an electrode plate 86. Also, as in FIG.
4,75,76,77 are connection terminals. The illustrated multilayer printed board 88 is a double-sided board, the electrode plates 85 and 87 are on the front surface of the multilayer printed board 88, and the electrode plate 86 is on the back surface of the multilayer printed board 88. Although the means for varying the capacitance of the tuning circuit is not shown in this figure,
For example, a means may be adopted in which a part of the electrode plate on the surface is cut off, and the capacitance is reduced and adjusted.

(Embodiment 3) FIG. 11 shows an electric configuration of a printed coil of an electrodeless discharge lamp device corresponding to Embodiment 3 and its peripheral circuits. FIG. 11 is different from FIG. 9 in that a capacitor 89 is inserted on the ground side of the matching circuit between the tuning variable capacitor 71 and the impedance matching capacitor 73 to form a balanced-unbalanced conversion circuit. Is converted to a balanced type, and the matching circuit section having the impedance matching capacitors 72 and 73 and the coil section 90 are formed into a balanced circuit configuration. The tuning variable capacitor 71 shown in FIG. 9 has a capacitor 84 in which a capacitor 92 is separated and added in order to explain one of means for adjusting the tuning circuit. Reference numeral 91 denotes a ferrite core provided to block noise as described later. Reference numerals 95 and 96 are connection terminals for connecting the coil section 90 and the matching circuit section, and 93 and 94 are connection terminals for connecting the matching circuit section to a high-frequency power supply via a coaxial cable.

FIG. 12 is a top view when the electric circuit shown in FIG. 11 is provided on a multilayer printed circuit board 100 such as an alumina ceramic substrate. In FIG. 12 as well as in FIG. 10, the coil portion 90, like the printed coil shown in FIG.
Board 100a provided with a coil conductor constituting
Are provided, and the matching circuit portion substrate 97 is co-produced from a vacant area in the inner central portion thereof. Also, 100
“b” is a through hole for connecting an interlayer coil of a multilayer coil conductor provided on both sides of the substrate as shown in FIG.

As described above, since the coil section 90 operates as a balanced coil, the noise emission from the coil section 90 due to the unbalanced mode (grounded antenna mode) is small, but in order to further reduce the noise level, Coil section 9
The ferrite core 91 is inserted into the protrusion 101 protruding from the coil substrate 100a provided with the "0" to prevent a common mode noise current.

Numerals 93, 94, 95 and 96 are connection terminals shown in FIG. 11, and 98, 99, 104 and 105 are impedance-matching capacitors 72 and 98 shown in FIG.
73, a common electrode plate for the capacitors 84 and 89; Reference numeral 103 denotes a cutoff portion of the common electrode plate corresponding to the above-described capacitor 92, and FIG. 12 shows a state where the capacitor 92 is cut off. The groove 102 for separating the common electrode plate 99 from the separation portion 103 can be separated by an arbitrary area using a laser, an ultrasonic cutter, a file, or the like. In the actual adjustment, the adjustment is finished at a point slightly separated from the optimum point by separating small amounts.

FIG. 13 shows an example in which a coil substrate and a matching circuit substrate are taken together from the same substrate as shown in FIGS. That is, as shown in FIG. 2, the coil substrate 113 provided with the coil conductor and the substantially disc-shaped matching circuit substrate 114 taken together from the center thereof are separated. FIG. 14 shows an electric circuit mounted on each substrate of FIG. 14, the same components as those in FIG. 13 are denoted by the same reference numerals.

In FIG. 13, a tongue piece 116 serving as a holding portion having a concave portion recessed toward the center is provided on a part of the periphery of the matching circuit board 114 instead of the convex portion 115 protruding from the coil substrate 113. The ferrite core 108 is arranged on the tongue piece 116. The tip of the tongue 116 has a coil portion 1 made of a coil conductor of the coil substrate 113.
11 are provided and inserted and held so as to penetrate the ferrite core 108, so that a common mode choke coil serving as a common mode filter for the coil conductor and the coil substrate 113 is formed. The radiation of the common mode noise from the coil conductor can be prevented.

FIGS. 13 and 14 show a countermeasure for a case where the capacity of the matching capacitor constituted by the dielectric constant (about 10) of the alumina substrate is insufficient. That is, using a ceramic substrate having a high dielectric constant (20, 40, 90, or the like), the collective capacitor block 109 is formed in a structure as shown in FIG. The surface is mounted on the matching circuit board 114.
Reference numeral 110 denotes a laser-trimmable capacitor similarly mounted on the surface. Reference numerals 111 and 112 denote connection terminals for connecting the collective capacitor block 109 to a high-frequency power supply via a coaxial cable. In this manner, it is possible to cope with a case where the area of the matching circuit board 114 is insufficient, particularly when the coil is driven at a relatively low frequency and a large-capacity capacitor is required.

[0044]

As described above, according to the first aspect of the present invention,
An arc tube in which a discharge gas is sealed and a phosphor is coated on the inner surface, an arc tube lighting coil arranged close to the arc tube, and a high-frequency current flowing through the arc tube lighting coil A high-frequency power supply, and a high-frequency electromagnetic field generated in the arc tube lighting coil causes an ultraviolet ray emitted from a high-frequency plasma ring generated inside the arc tube to excite the phosphor to emit light. In the electric lamp device, as the arc tube lighting coil, a printed circuit board in which a coil conductor is formed by a conductor foil on a dielectric substrate is used, and an impedance matching circuit pattern or a circuit element pattern is formed on the printed circuit board. Since at least a part of the coil is formed, it is possible to suppress the variation of the coil which causes the variation of the tuning frequency tuned to the fundamental frequency of the high frequency power supply. In addition, it is possible to realize a coil having a small area for shielding the heat or light of the arc tube, and by mounting a matching circuit on a printed circuit board, it is possible to reduce a circuit area where a main resonance current flows. It is possible to minimize the circuit loss and, at the same time, to reduce unnecessary radiation from the coil conductor, and it is reasonable to form the coil conductor and a pattern such as a matching circuit on the same substrate. And cost can be reduced.

According to a second aspect of the present invention, in the first aspect of the invention, since the arc tube lighting coil is formed of a resin dielectric multilayer printed circuit board, the resin dielectric multilayer printed circuit board is light in weight and low in high frequency loss. , A coil which is highly accurate and suitable for mass production can be realized.

According to a third aspect of the present invention, in the first aspect of the present invention, since the arc tube lighting coil is formed of an inorganic dielectric multilayer printed circuit board, a high-cost printed circuit board having a high dielectric constant is used. A coil with high accuracy and suitable for mass production can be realized.

According to a fourth aspect of the present invention, in the second or third aspect of the present invention, an insulator layer of the multilayer printed board is disposed on an outermost layer of the multilayer printed board constituting the arc tube lighting coil. Since the coil conductor is used as protection means, the outermost layer is used as an insulator layer using a multi-layer substrate structure to prevent rust, moisture, etc., and is used as a protection layer for the coil conductor. The performance is improved.

According to a fifth aspect of the present invention, in the second or third aspect of the present invention, a resin solder resist material is disposed on the outermost layer of the multilayer printed board constituting the arc tube lighting coil to form an insulator layer. Since the coil conductor is configured and used as the coil conductor protection means, protection of the coil conductor can be realized at low cost.

According to a sixth aspect of the present invention, in the first aspect of the present invention, the tuning circuit tunes at least to the fundamental frequency of the high-frequency power supply together with the coil conductor on a printed circuit board constituting the arc tube lighting coil. With this configuration, the area of the circuit section through which the main resonance current flows can be minimized, so that the circuit loss can be reduced and, at the same time, unnecessary radiation from the coil conductor can be reduced.

According to a seventh aspect of the present invention, in the sixth aspect of the present invention, as a means for adjusting a tuning frequency of the tuning circuit, a laser trimmable capacitor capable of laser trimming is mounted on the printed circuit board. The tuning frequency can be adjusted.

According to an eighth aspect of the present invention, in the sixth aspect of the present invention, as means for adjusting a tuning frequency of the tuning circuit, a part of a coil conductor pattern or a capacitor pattern constituting the tuning circuit is selectively provided. Since a selective connection portion is provided in the printed conductor pattern of the printed circuit board so as to enable removal or connection, the tuning frequency can be adjusted.

According to a ninth aspect of the present invention, in the first aspect of the present invention, the unbalanced output circuit of the high-frequency power source is converted to a balanced type on a printed circuit board constituting the arc tube lighting coil. Since the balanced-unbalanced conversion circuit for connecting to the arc tube lighting coil is configured, it becomes difficult for the common mode noise current to flow through the arc tube lighting coil, and unnecessary radiation of noise components can be suppressed.

According to a tenth aspect of the present invention, in the ninth aspect of the present invention, the lead-out line from the coil conductor pattern is led out to a convex portion provided on a part of the printed circuit board. Since the common mode choke coil is formed through a ferrite core, unnecessary radiation due to the normal mode current of the coil conductor can be minimized, and the drive power can be transmitted by a coaxial cable that is inexpensive and has stable characteristics. The support for the core is unnecessary and the cost is low.

According to an eleventh aspect of the present invention, in the first aspect of the present invention, the impedance matching circuit is provided in a vacant area on the same substrate surrounded by a coil conductor of a printed circuit board constituting the arc tube lighting coil. Since an independent matching circuit board including at least a part is arranged, configured and shared, the inner space surrounded by the coil conductors of the printed circuit board constituting the coil is unnecessary and is unused space. This space can be effectively used as an independent matching circuit board, and low cost can be realized.

According to the twelfth aspect, the eleventh aspect is provided.
In the invention according to the invention, at least a part of the impedance matching circuit is provided with a holding portion for inserting and holding a ferrite core in order to constitute a common mode choke coil, so that a common mode current to the coil conductor is effectively prevented. Becomes possible.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an overall configuration of an electrodeless discharge lamp device according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a configuration of a print coil used in the electrodeless discharge lamp device of the above.

FIG. 3 is a diagram showing a structure of each example of a print coil used in the electrodeless discharge lamp device of the above, and FIG.
(B) and (c) are cross-sectional views.

FIG. 4 is a circuit diagram showing an electrical configuration of a print coil and peripheral circuits used in the electrodeless discharge lamp device of the above.

FIG. 5 is a top view showing a state where the circuit shown in FIG. 4 is mounted on a substrate.

FIG. 6 is a diagram showing a capacitor block used in the electrodeless discharge lamp device according to the first embodiment of the present invention,
(A) is a structural diagram showing a structure, (b) is a circuit diagram showing an electrical relationship.

FIG. 7 is a sectional view showing a structure of a laser trimmable capacitor used in the electrodeless discharge lamp device of the above.

FIG. 8 is a view showing a variable capacitance element used in the electrodeless discharge lamp device of the above, wherein (a) is a perspective view showing a structure;
(B) is a circuit diagram showing a configuration.

FIG. 9 is a circuit diagram illustrating an electrical configuration of a print coil and peripheral circuits used in an electrodeless discharge lamp device according to a second embodiment of the present invention.

FIG. 10 is a top view showing a state where the circuit shown in FIG. 9 is mounted on a substrate.

FIG. 11 is a circuit diagram showing an electrical configuration of a print coil and peripheral circuits used in an electrodeless discharge lamp device according to a third embodiment of the present invention.

FIG. 12 is a top view showing a state where the circuit shown in FIG. 11 is mounted on a substrate.

FIG. 13 is a perspective view showing a state where a coil board and a matching circuit board corresponding to Embodiment 3 of the present invention are separated.

FIG. 14 is a circuit diagram showing an electric circuit configuration on the printed circuit board shown in FIG.

FIG. 15 is a perspective view showing the overall configuration of a conventional electrodeless discharge lamp device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Arc tube 2 Print coil 3 Silicon rubber pad 4 Coaxial cable 5 Housing 6 Coil conductor

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shinichi Anan 1048 Odakadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd. F-term (reference) 3K072 AA16 GB01 5C039 NN04 NN09

Claims (12)

[Claims] 1. An arc tube in which a discharge gas is sealed and a phosphor is coated on the inner surface, an arc tube lighting coil disposed close to the arc tube, and an arc tube lighting coil A high-frequency power supply that supplies a high-frequency current to the light-emitting tube, and a high-frequency electromagnetic field generated in the arc tube lighting coil causes ultraviolet rays emitted from a high-frequency plasma ring generated inside the arc tube to excite the phosphor to emit light. In the electrodeless discharge lamp device, a printed circuit board having a coil conductor formed of conductive foil on a dielectric base material is used as the arc tube lighting coil, and a pattern of an impedance matching circuit is formed on the printed circuit board. Alternatively, an electrodeless discharge lamp device wherein at least a part of a circuit element pattern is formed. 2. The electrodeless discharge lamp device according to claim 1, wherein the arc tube lighting coil is formed of a resin dielectric multilayer printed circuit board. 3. The electrodeless discharge lamp device according to claim 1, wherein the arc tube lighting coil is formed of an inorganic dielectric multilayer printed circuit board. 4. The protection means for protecting the coil conductor, wherein an insulating layer of the multilayer printed circuit board is arranged on the outermost layer of the multilayer printed circuit board constituting the arc tube lighting coil, and the coil conductor is protected. Or the electrodeless discharge lamp device according to 3. 5. An insulating layer formed by arranging a resin solder resist material on the outermost layer of a multilayer printed circuit board constituting the arc tube lighting coil, and serving as protection means for the coil conductor. The electrodeless discharge lamp device according to claim 2. 6. A tuning circuit according to claim 1, wherein a tuning circuit for tuning to a fundamental frequency of said high-frequency power source is formed on at least a printed circuit board constituting said arc tube lighting coil together with said coil conductor. Electrode discharge lamp device. 7. The electrodeless discharge lamp device according to claim 6, wherein a laser trimmable capacitor capable of laser trimming is mounted on the printed circuit board as means for adjusting a tuning frequency of the tuning circuit. 8. A means for adjusting a tuning frequency of the tuning circuit, a printed conductor pattern on the printed circuit board so that a part of a coil conductor pattern or a capacitor pattern constituting the tuning circuit can be selectively removed or connected. 7. The method according to claim 6, wherein a selective connection portion is provided.
The electrodeless discharge lamp device as described in the above. 9. An unbalanced conversion for converting an unbalanced output circuit of the high-frequency power supply into a balanced type on a printed circuit board constituting the arc tube lighting coil and connecting the circuit to the arc tube lighting coil. The electrodeless discharge lamp device according to claim 1, wherein a circuit is configured. 10. A common mode choke coil in which a lead line from the coil conductor pattern is led out to a protrusion provided on a part of the printed circuit board, and a ferrite core is passed through the protrusion. The electrodeless discharge lamp device according to claim 9, wherein 11. An independent matching circuit board including at least a part of the impedance matching circuit is disposed in an empty region on the same substrate surrounded by a coil conductor of a printed circuit board constituting the arc tube lighting coil. The electrodeless discharge lamp device according to claim 1, wherein the electrodeless discharge lamp device is configured to be shared. 12. The electrodeless discharge lamp according to claim 11, wherein a holding portion for inserting and holding a ferrite core is provided in at least a part of the impedance matching circuit to form a common mode choke coil. apparatus.