JP2001338788A - Luminaire using electrodless discharge lamp as light source - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a luminaire using electrodeless discharge lamp as the light source, in which the power loss by the induced current by electromagnetic induction from an induction coil to a reflecting mirror is reduced. SOLUTION: A clearance 26a is provided between an induction coil 11 and a reflecting mirror 20 arranged adjacently thereto. The current 27 induced by electromagnetic induction, from the induction coil 11 to the reflecting mirror 20, is interrupted by a clearance 26a and suppressed. Consequently, the loss of the supply of power from a high-frequency power source 12 due to flow of the induced current 17 to the reflecting mirror 20 can be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting apparatus using an electrodeless discharge lamp as a light source.

[0002]

2. Description of the Related Art Conventionally, there has been proposed a lighting apparatus using a non-electrode discharge lamp in which a discharge gas is sealed and an induction coil is arranged in close proximity as a light source (for example, see JP-A-11-3604). FIG. 20 shows a lighting apparatus described in Japanese Patent Application Laid-Open No. 11-3604, in which a discharge gas is sealed inside a bulb made of a light-transmitting material in an airtight manner. Electrode discharge lamp 10, an induction coil 11 provided on the outer periphery of the electrodeless discharge lamp 10, and a high frequency power supply connected to the induction coil 11 to form a high frequency electromagnetic field around the induction coil 11 to excite a discharge gas. 12 and a metal reflector 50 that reflects light from the electrodeless discharge lamp 10.

In this luminaire, a high-frequency current is supplied from a high-frequency power supply 12 to an induction coil 11 to generate a high-frequency electromagnetic field in the induction coil 11 to excite the discharge gas in the electrodeless discharge lamp 10 to discharge the electrodeless electrode. The electric lamp 10 is turned on.

[0004]

However, in the above-described lighting fixture, the reflector 50 is disposed close to the induction coil 11, and the reflector 50 is formed in a bowl shape. Due to the magnetic field 54 formed around the coil 11, the induced current 27 caused by electromagnetic induction from the induction coil 11 flows through the reflector 50 in a loop. Therefore, there has been a problem that the power from the high-frequency power supply 12 has a loss.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object the purpose of providing a conductive member by electromagnetic induction from an induction coil even when a conductive member is disposed in proximity to the induction coil. It is an object of the present invention to provide a lighting apparatus using an electrodeless discharge lamp as a light source, which can suppress power loss caused by an induced current flowing in a loop in a member.

[0006]

According to a first aspect of the present invention, there is provided an electrodeless discharge lamp filled with a discharge gas, an induction coil disposed in close proximity to the electrodeless discharge lamp, and the induction coil connected to the induction coil. A high-frequency power source that forms a high-frequency electromagnetic field around the coil to excite the discharge gas to emit light, and a lamp body made of a conductor disposed in proximity to the induction coil, and that is provided by electromagnetic induction from the induction coil. At least one gap that suppresses the induction current from flowing through the lamp body member is provided in the lamp body member. The gap restricts the path of the induction current and makes it difficult for the induction current to flow. Loss of power supplied from the power supply can be suppressed.

According to a second aspect of the present invention, there is provided an electrodeless discharge lamp filled with a discharge gas, an induction coil disposed in close proximity to the electrodeless discharge lamp, and a high-frequency electromagnetic wave connected to the induction coil and surrounding the induction coil. A high-frequency power supply that forms a field to excite the discharge gas to emit light, and a lamp body member in which a conductive film disposed close to the induction coil is adhered to a non-conductive base material; The conductive film is provided with at least one gap for suppressing an induced current caused by electromagnetic induction of the conductive film from flowing through the conductive film, and the gap restricts a flow path of the induced current, so that the induced current hardly flows. Loss of power supplied from the high-frequency power supply can be suppressed.

[0008] The invention of claim 3 is claim 1 or claim 2.
In the above, the gap is provided close to the induction coil, and the induction current is blocked at a portion where the degree of coupling with the induction coil is large and the induction current is likely to flow. The effect of suppressing the power loss caused by flowing through the power supply can be further enhanced.

[0009] The invention of claim 4 is the invention of claim 1 or claim 3.
Wherein the lamp body member is a reflecting mirror for reflecting light from the electrodeless discharge lamp in a target direction.

According to a fifth aspect of the present invention, in the second aspect, the conductive film is made of a metal film, and forms a reflector for reflecting light from the electrodeless discharge lamp in a target direction.

The invention of claim 6 is the invention of claim 4 or claim 5.
In the above, the reflecting mirror is made of aluminum.

[0012] The invention of claim 7 is the invention of claim 1 or claim 3.
, Wherein the lamp body member is at least a part of a fixture main body that houses the electrodeless discharge lamp, the induction coil, and the high-frequency power supply.

[0013] The invention of claim 8 is the invention of claim 1 or claim 2.
, The lamp body member is provided on a side from which light is extracted from the electrodeless discharge lamp, and has a light transmitting property.

According to a ninth aspect of the present invention, in the second aspect, the lamp body member is provided on a side from which light is extracted from the electrodeless discharge lamp, and the conductive film is made of a transparent conductive oxide.

According to a tenth aspect of the present invention, in the eighth or ninth aspect, the lamp body member is formed in a planar shape.

According to an eleventh aspect of the present invention, in the eighth or ninth aspect, the lamp body is formed in a shape surrounding the electrodeless discharge lamp and the induction coil.

According to a twelfth aspect of the present invention, in accordance with the eighth or ninth aspect, the lamp body member surrounds the electrodeless discharge lamp and the induction coil and disperses light from the electrodeless discharge lamp. It has become.

According to a thirteenth aspect of the present invention, in the first to twelfth aspects, the gap is formed in a single strip shape, and the gap restricts the path of the induced current, thereby reducing the induced current. Since the flow becomes difficult, loss of power supplied from the high-frequency power supply can be suppressed.

According to a fourteenth aspect of the present invention, in any of the first to twelfth aspects, the gap is formed radially about a center axis of the induction coil, and the radial gap defines an induction current path. Since this portion is divided into a plurality of regions, the path through which the induced current flows is further restricted, and the induced current becomes difficult to flow. Therefore, the effect of suppressing the power loss due to the flow of the induced current can be further enhanced.

According to a fifteenth aspect of the present invention, in any one of the first to twelfth aspects, the gap formed by the radially centered portion centering on the center axis of the induction coil intersects with the annularly formed portion. Thus, the portion serving as the path of the induced current is divided into more areas than the configuration of claim 14, and the path through which the induced current flows is further restricted, so that the induced current flows. It will be difficult
The effect of suppressing the power loss due to the induced current flowing through the lamp body member can be further enhanced.

According to a sixteenth aspect of the present invention, in any of the first to fifteenth aspects, the gap is formed so as to intersect a direction in which the induced current flows, and the induced current flows through the lamp body member. , Power loss from the high-frequency power supply can be effectively suppressed.

According to a seventeenth aspect of the present invention, in any of the first to sixteenth aspects, at least one end of the gap is open.

According to an eighteenth aspect, in the seventeenth aspect, one end of the gap close to the induction coil is opened.

According to a nineteenth aspect, in the seventeenth aspect, both ends of the gap are open.

According to a twentieth aspect, in the fifth aspect,
The gap is formed by performing masking when depositing a metal film, so that the gap can be formed accurately and narrowly.

According to a twenty-first aspect of the present invention, there is provided an electrodeless discharge lamp filled with a discharge gas, an induction coil disposed in close proximity to the electrodeless discharge lamp, and a high-frequency electromagnetic wave connected to the induction coil and surrounding the induction coil. A high-frequency power supply that forms a field to excite the discharge gas to emit light, and a lamp body member having a conductive material disposed in proximity to the induction coil; The conductive material is provided with a gap that intersects the direction in which the conductive material flows and at least one end of the conductive material is opened, and the gap restricts the flow path of the induced current and makes it difficult for the induced current to flow. Loss of power supplied from the power supply can be suppressed.

[0027]

(Embodiment 1) FIG. 3 is a circuit diagram showing a lighting device used in the present embodiment, which shows an electrodeless discharge lamp 10 in which a discharge gas is sealed, and an outer periphery of the electrodeless discharge lamp 10. An induction coil 11 arranged in close proximity to the coil and a high-frequency power supply 12 connected to the induction coil 11 via a coaxial cable 17 to form a high-frequency electromagnetic field around the induction coil 11 to excite the discharge gas; A matching circuit 1 that efficiently supplies high frequency power to the induction coil 11 by matching impedance between the induction coil 11 and the high frequency power supply 12
8 is provided. As is well known, the matching circuit 18 is provided to match the induction coil 11 and the high-frequency power supply 12 to reduce reflection loss.

The electrodeless discharge lamp 10 is one in which an inert gas or metal vapor is sealed as a discharge gas in a spherical glass bulb. As the discharge gas, for example, a mixed gas of mercury and a rare gas is used, and a phosphor is applied to the inner surface of the glass bulb as needed. The high frequency power supply 12 is a DC power supply E
1 as a driving power supply, and a DC power supply E2
And a drive device 13 using the as a driving power source. The DC power supply E1 is generated from a voltage obtained by rectifying an AC power supply such as a commercial power supply, and the DC power supply E2 is generated from the DC power supply E1. The main amplifier 16 constitutes a so-called class D amplifier circuit including a series circuit of two field effect transistors (MOSFETs) Q1 and Q2. On the other hand, the drive device 13
Are the oscillation circuit 14 using the crystal oscillator X and the oscillation circuit 1
4 and a preamplifier 15 that amplifies the oscillation output of No. 4. That is, the output of the oscillation circuit 14 is
Then, the high frequency power amplified by the main amplifier 16 is output from the high frequency power supply 12.

When the power is turned on, a high-frequency current of several hundred KHz to several hundred MHz flows from the high-frequency power supply 12 to the induction coil 11, so that a high-frequency electromagnetic field is formed around the induction coil. The discharge gas sealed in the electrodeless discharge lamp 10 is excited, and the electrodeless discharge lamp 10 is excited.
A high-frequency plasma current is generated inside. At this time, ultraviolet light or visible light is emitted from the electrodeless discharge lamp 10.

FIG. 1A is a schematic sectional view showing the present embodiment. As shown in FIG. 1A, a high-frequency power supply 12 is housed inside the apparatus main body 22 together with the electrodeless discharge lamp 10 and the induction coil 11, and further controls the light distribution of the light from the electrodeless discharge lamp 10. Mirror 20 is housed as a lamp body member. The reflecting mirror 20 is formed of a metal (preferably aluminum) in a bowl shape having an open upper surface in FIG. 1A, and the electrodeless discharge lamp 10 is disposed inside the reflecting mirror 20 so that the electrodeless discharge lamp is formed. The light from 10 is extracted by the reflecting mirror 20 upward in FIG.
Further, a disc-shaped panel 21 having a light-transmitting property is provided inside the apparatus main body 10 on the side from which light is extracted from the electrodeless discharge lamp 10, that is, on the opening side of the reflecting mirror 20 with respect to the electrodeless discharge lamp 10.
Is arranged. The panel 21 is made of transparent or milky glass or acrylic. The high-frequency power supply 12 is disposed in the lower part of the appliance body 22 in FIG. 1A and on the opposite side of the reflector 20 from the electrodeless discharge lamp 10.

As shown in FIGS. 1B and 2, the reflecting mirror 20 has a through hole 23 formed in the center thereof, and the through hole 23 has a mount 24 for holding and fixing the electrodeless discharge lamp 10. Part is inserted. A matching circuit 1 is provided inside the mount 24.
8 is housed and connected via a coaxial cable 17 to a high-frequency power supply 12 arranged below a mount 24 in the instrument body 22. A single band-shaped gap 26 a is formed in the reflecting mirror 20, one end of which is open to the through hole 23 and the other end of which is open to the opening edge 25 of the reflecting mirror 20. The gap 26 a penetrates the front and back of the reflecting mirror 20 and is formed narrow in the circumferential direction of the reflecting mirror 20. Further, the electrodeless discharge lamp 10 and the reflecting mirror 20 mounted on the mount 24 are arranged such that the opening surface of the through hole 23 and the central axis of the induction coil 11 (the axis orthogonal to the winding direction of the induction coil 11) are substantially orthogonal. Placed in

In the above-described configuration, when the power is turned on and the electrodeless discharge lamp 10 is turned on, an induction current 27 flows through the reflecting mirror 20 disposed close to the induction coil 11 due to electromagnetic induction from the induction coil 11. To try. Here, when the gap 26a is not formed in the reflecting mirror 20 as in the conventional configuration, the induced current flows through the reflecting mirror 20 in a loop shape.
A gap 26a is formed in the gap, and the gap 26a extends in a direction intersecting the direction in which the induced current 27 flows, and the gap 26a is formed over the entire length from the through hole 23 to the opening edge 25. Induction current 27 is reflected mirror 20
Does not flow in a loop, and as a result, the induced current 27
Can be suppressed. As a result, the induction coil 1
Loss due to the induced current 27 due to electromagnetic induction from the first to the reflecting mirror 20 is reduced, and loss of power supplied from the high-frequency power supply 12 can be suppressed.

As described above, the gap 2 is
6a, the reflecting mirror 20 is connected to the induction coil 1
1 can be reduced. Therefore, the power supplied from the high-frequency power supply 12 required to obtain a desired light output from the electrodeless discharge lamp 10 does not change significantly depending on the presence or absence of the reflecting mirror 20. When the power is constant, the light output from the electrodeless discharge lamp 10 does not greatly change depending on the presence or absence of the reflecting mirror 20. Here, since the gap 26a is formed in the reflecting mirror 20, the area of the reflecting surface of the reflecting mirror 20 is reduced and the reflection efficiency is reduced. Keep it narrow. By forming the reflecting mirror 20 of aluminum, the reflecting mirror 20 having a high reflectivity can be formed relatively inexpensively, and since the workability is excellent, the gap 26a can be easily formed.

(Embodiment 2) In this embodiment, the reflecting mirror 20
Other configurations and operations are the same as those of the first embodiment, and the description of the other members will be omitted.

As shown in FIG. 4, the reflecting mirror 20 used in the present embodiment has a through hole 23 as a center in the reflecting mirror 20 having the same outer shape as that of the first embodiment (that is, the center of the induction coil 11). The gap 26a is formed radially (centering on the intersection with the axis). Here, four gaps 26 a formed in a band shape are provided at equal intervals in the circumferential direction of the reflecting mirror 20. Further, one end of the gap 26 a is formed to be open to the through hole 23, and the other end is formed not to be opened on the opening edge 26 a side of the reflecting mirror 20. That is, the reflecting mirror 20 is located at the gap 2
It is formed in a shape that can be handled as one member without being separated by 6a. Moreover, the induction coil 1
A gap 26a is provided on the inner peripheral side of the reflecting mirror 20 where the path through which the induced current generated by 1 flows in a loop shape is relatively short, and the portion where the gap 26a is not formed is only on the outer peripheral side of the reflecting mirror 20. A gap 26 near the opening edge of 20
Although a is not formed, it can be said that the effect of suppressing the induced current from flowing in a loop is sufficiently large. Moreover, in the direction in which the induced current flows, a plurality of gaps 26 are formed.
Since “a” is provided, it is considered that the induced current becomes more difficult to flow than in the first embodiment, and the effect of suppressing the power loss by the reflecting mirror 20 is further higher than in the first embodiment. In addition,
In this embodiment, four gaps 26a are provided.
There is no particular limitation on the number of the gaps 26a as long as the gaps 26a are formed radially around the center 3.

(Embodiment 3) In this embodiment, the reflecting mirror 20 is used.
Other configurations and operations are the same as those of the first embodiment, and the description of the other members will be omitted.

As shown in FIG. 5, the reflecting mirror 20 used in this embodiment has a gap 26a radially formed around the through hole 23 in the reflecting mirror 20 having the same outer shape as that of the first embodiment. An annular (concentric) gap 26b formed around the through hole 23 is formed to intersect with each other. However, the reflecting mirror 20 of the present embodiment is formed by evaporating an aluminum metal film 29 to form a reflecting surface on the inner surface of a bowl-shaped support 28 which is a non-conductive base material. is there. That is, the reflecting mirror 20 having a structure in which the conductive film (metal film 29) is adhered to the base material (support 28) is formed. The gaps 26a and 26b are formed by performing masking when depositing a metal film.
In the illustrated example, twelve gaps 26a are formed, and two gaps 26b are formed.
By this formation, the metal film 29 is divided into 36 parts.

In the configuration of this embodiment, the metal film 29 formed on the reflecting mirror 20 is divided into a large number by the gaps 26a and 26b, and the divided regions are insulated independently of each other. A flowing path is not easily formed, and power loss due to the induced current can be further reduced as compared with the configuration of the second embodiment. In addition, in the reflecting mirror 20 used in the present embodiment, the gaps 26a and 26b are formed by masking the support 28 during the deposition of the metal film 29, so that the gaps 26a and 26b are formed narrow with good dimensional accuracy. As a result, it is possible to form a large number of gaps 26a and 26b while securing the area of the reflection surface of the reflection mirror 20. Note that the gaps 26a, 26 in the present embodiment are
The number of b is not particularly limited.

(Embodiment 4) This embodiment has basically the same configuration as that of the first embodiment. Therefore, the same components as those of the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

FIG. 6 is a schematic sectional view showing the present embodiment. As in the third embodiment, the reflecting mirror 20 is used to form a reflecting surface on the surface of a support 28 which is a non-conductive base material. A metal film (conductive film) 29 is used. However, as shown in FIG. 7, the metal film 29 has a single band-shaped gap 26 having an inner peripheral end and an outer peripheral end that are open.
is formed, and one annular gap 26c is formed so as to cross each other over the entire circumference of the reflecting mirror 20 in the circumferential direction. The gap 26c is formed in the reflecting mirror 20 at a portion closer to the induction coil 20 than other portions. These gaps 26a and 26c are formed by performing masking when depositing the metal film 29 on the support 28, respectively.

The gap 26a in the present embodiment functions in the same manner as in the first embodiment, and can suppress power loss due to generation of an induced current. Further, in the present embodiment, the gap 26
By forming c in the vicinity of the induction coil 11, the gap 26c is formed in a portion where the induction current due to the electromagnetic induction from the induction coil 11 easily flows, and the power loss due to the induction current is smaller than in the first embodiment. It can be further reduced.

(Embodiment 5) This embodiment has basically the same configuration as that of the first embodiment. Therefore, the same components and operations as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted. I do.

As shown in FIG. 8, in this embodiment, radiation noise from the induction coil 11 is shielded on one surface (a surface facing the reflecting mirror 20) of the disc-shaped panel 21 which is a non-conductive base material. A transparent conductive film 31 is formed as an electromagnetic shield. As shown in FIG. 9, a transparent conductive film 31 is laminated on the panel 21. The transparent conductive film 31 is a transparent conductive oxide film, and is made of ITO or SnO ₂ . Four gaps 26 a are formed in the transparent conductive film 31 so as to be radially formed from the center of the panel 31. These gaps 26a are formed by performing masking when the transparent conductive film 31 is formed on the panel 31 by coating.
The transparent conductive film 31 is divided into four regions,
In order to perform electromagnetic shielding, each region is grounded via a ground line 32. Note that the device main body 32 is formed of metal, and a ground wire 32 connected to the transparent conductive film 31.
Is connected to the instrument body 32.

In this embodiment, as in the first embodiment, the induction current 27 tries to flow in a loop shape through the transparent conductive film 31 by electromagnetic induction from the induction coil 11, but the transparent conductive film 31 is divided by the gap 26a. And the gap 26a intersects the direction in which the induced current 27 flows, so that the induced current 27 is suppressed.

As described above, in the lighting fixture of the present embodiment, the induction current 27 due to the electromagnetic induction from the induction coil 11 to the panel 21 does not flow in the transparent conductive film 31 in a loop, but is supplied from the high frequency power supply 12. Power loss can be suppressed. Further, since the transparent conductive film 31 is laminated on the panel 21 and the gap 26 a is formed by masking, the width of the gap 26 a is accurately made narrow. The radiation noise from the coil 11 can be grounded. Furthermore, since the transparent conductive film 31 is transparent or milky white, the panel 21 can transmit light from the electrodeless discharge lamp 10 to the outside. Therefore, the lighting fixture of the present embodiment can output the light from the electrodeless discharge lamp 10 to the outside without blocking the radiation noise from the induction coil 11 and extremely lowering the light output efficiency.

(Embodiment 6) This embodiment has basically the same configuration as that of the first embodiment. Therefore, the same components and operations as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted. I do.

The apparatus main body 22 used in this embodiment is formed in a cylindrical shape (see FIG. 11). As shown in FIG. 10, the apparatus main body 22 has a light extraction side from the electrodeless discharge lamp 10 on the side thereof. A glass globe 36a is covered. Further, the inner diameter of the instrument body 20 is formed relatively small, and the reflecting mirror 20 is formed shallower than the other embodiments described above. Therefore, in this embodiment,
In the vicinity of the connecting portion 33 between the device main body 22 and the glass globe 36a, the distance between the induction coil 11 and the device main body 22 is smaller than in the configuration of the first embodiment. That is,
In the first embodiment, the reflecting mirror 20 is interposed between the induction coil 11 and the instrument main body 20, whereas in the present embodiment, the reflecting mirror 2 is interposed between the induction coil 11 and a part of the instrument main body 20.
A part where 0 does not exist is formed.

Therefore, in the present embodiment, as shown in FIG. 11, a plurality of gaps 26d are formed at the upper end of the instrument body 22 in the circumferential direction. Each of the gaps 26 d is open to the upper end edge of the appliance main body 22, and is formed to penetrate the front and back of the peripheral wall of the appliance main body 22. By adopting such a configuration, the induction current 2 is applied to the fixture body 22 as a lamp member by electromagnetic induction from the induction coil 11.
7, the gap 27d causes the induced current 27 to flow.
Is limited, the induced current 27 near the coupling portion 33 is
Does not flow in a loop, so that loss of power supplied from the high-frequency power supply 12 can be suppressed.

(Embodiment 7) Since this embodiment has basically the same configuration as that of the first embodiment, the same reference numerals are given to the same configurations and operations as those of the first embodiment, and the description will be omitted. I do.

As shown in FIGS. 12 and 13, the present embodiment is provided with a pole head type instrument body 22 surrounding the electrodeless discharge lamp 10 with a transparent or milky white translucent material. An inverted truncated conical prism 35 is arranged on a side surface of the instrument body 22. In addition, on the upper surface side of the appliance body 22, there is provided a reflecting mirror 34 as a lamp body member formed of a metal plate that reflects light from the electrodeless discharge lamp 10 downward. The upper and lower surfaces of the prism 35 are open, the electrodeless discharge lamp 10 is inserted through the lower surface opening 35 a, and the upper surface opening is covered with a reflecting mirror 34 fixed to the upper part of the instrument body 22. FIG. 14 shows the reflector 34 viewed upward from the point C in FIG.
The reflector is provided with a series of spiral gaps 26e.

Thus, the induction coil 11 and the reflecting mirror 34
The induced current 27 tends to flow in a loop shape due to electromagnetic induction to the mirror, but since the gap 26e is formed in the spiral shape in the reflecting mirror 34, a loop cannot be formed, and the induced current 27 is limited. Will be. As a result, the induced current 2
It is possible to suppress the power loss caused by the flow of 7 through the reflecting mirror 34.

(Embodiment 8) This embodiment has basically the same configuration as that of the seventh embodiment, and the configuration and operation having the same functions as those of the seventh embodiment are denoted by the same reference numerals. Is omitted.

As shown in FIG. 15, on the inner surface of the prism 35 used in the present embodiment, a transparent conductive film 31 as an electromagnetic shield for shielding radiation noise from the induction coil 11 is provided.
Are formed. The transparent conductive film 31 is made of ITO or SnO ₂
And the like. Also,
In the transparent conductive film 31, a gap 26a formed by performing masking at the time of coating is formed. The four gaps 26a are provided radially from the edge of the lower surface opening 35a of the prism 35 to the opening edge of the upper surface, and the inner surface of the prism 35 has four transparent conductive films which are insulated independently from each other. 31 are formed. Further, each of the divided transparent conductive films 34 is connected to the appliance body 2 via the ground line 32.
2 is grounded.

However, even if the induction current 27 tries to flow in a loop into the transparent conductive film 31 formed on the prism 35 by electromagnetic induction from the induction coil 11, the induction current 27 is blocked by the gap 26a. 27 will be suppressed. As a result, it is possible to suppress the power loss caused by the induction current 27 caused by electromagnetic induction from the induction coil 11 to the transparent conductive film 31 formed on the inner surface of the prism 35 flowing in a loop. Also, the prism 35
Is coated with a transparent conductive film 31, the transparent conductive film 31 functions as an electromagnetic shield, and radiation noise from the induction coil 11 can be reduced. The transparent conductive film 31 may be formed on the outer surface of the prism 35 instead of the inner surface.

(Embodiment 9) This embodiment has basically the same configuration as the embodiments 7 and 8, and operates similarly.

As shown in FIGS. 16 and 17, the instrument body 22 is formed in a cylindrical shape, and has a cylindrical glass glove 36b made of a transparent or milky transparent material on the side surface. The appliance body 22 houses the electrodeless discharge lamp 10, the induction coil 11, the high-frequency power supply 12, and an inverted truncated conical prism 35. A transparent conductive film 31 for shielding radiation noise from the induction coil 11 is formed on the inner surface of the glass globe 36b as a lamp body member. A gap 26a is formed in the transparent conductive film 31,
The gap 26a is formed by performing masking when coating the transparent conductive film 31. The gap 26a is formed in the vertical direction, and only one end reaches the upper or lower edge of the glass globe 36b. A plurality of gaps 26a are formed along the circumferential direction on the inner surface of the glass globe 36b, and one end reaches the lower end edge next to the gap 26a whose one end reaches the upper end edge of the glass globe 36b. Gap 26b is formed. That is, the transparent conductive film 31 coated on the inner surface of the glass globe 36b
Are not completely separated by the gap 26a and form one continuous surface. The transparent conductive film 31 is connected to the appliance main body 22 made of a conductor (metal) via a ground wire 32, so that leakage of radiation noise to the outside is suppressed.

In the present embodiment, the induction current 27 tries to flow in a loop into the transparent conductive film 31 provided on the inner surface of the glass globe 36b by electromagnetic induction from the induction coil 11, but the induction current 27 is caused by the gap 26a. , The induced current 27 is suppressed. Further, in the present embodiment, since only one ground line 32 is required, connection of the ground line 32 is easy. Other configurations and operations are the same as those of the eighth embodiment. The transparent conductive film 3
Although 1 is formed on the inner side surface of the glass globe 36b, the same effect can be expected when formed on the outer side surface.

(Embodiment 10) The basic configuration and operation of this embodiment are the same as those of Embodiment 1, and the members having the same functions are denoted by the same reference numerals and their description is omitted.

In this embodiment, as shown in FIGS. 18 and 19, the device main body 22 is formed in a semi-cylindrical shape, and is cantilevered by a column with the arc-shaped portion on the upper side (that is, cantilever type illumination). Instrument). In addition, the apparatus body 22 includes the electrodeless discharge lamp 10, the induction coil 11, and the high-frequency power supply 12, and the reflecting mirror 3 as a lamp body member.
7 is stored. At one end 38 of the reflecting mirror 37, a band-shaped gap 26a is formed radially around an appropriate position.
The book is formed. A round hole 41 is formed at the other end of the reflecting mirror 37, and the electrodeless discharge lamp 1 is passed through the round hole 41.
A part of the mount 24 holding 0 is inserted. An opening is formed on one surface of the instrument body 22, and a reflecting mirror 37 is arranged corresponding to the opening.

Thus, the induction current 27 tends to flow in a loop at the end of the reflector 37 due to the electromagnetic induction from the induction coil 11, but the reflector 37 is provided with a radially formed gap 26a. Therefore, the path through which the induced current 27 flows is restricted, and as a result, power loss supplied from the high-frequency power supply 12 can be suppressed. Other configurations and operations are the same as those of the first embodiment.

[0061]

According to the first aspect of the present invention, there is provided an electrodeless discharge lamp in which a discharge gas is sealed, an induction coil disposed in close proximity to the electrodeless discharge lamp, and an induction coil connected to the induction coil and surrounding the induction coil. A high-frequency power supply that forms a high-frequency electromagnetic field to excite the discharge gas to emit light, and a lamp body member made of a conductor disposed in proximity to the induction coil, wherein an induction current due to electromagnetic induction from the induction coil is At least one gap is provided in the lamp body member for suppressing the flow to the lamp body member. Since the gap restricts the path of the induced current and makes it difficult for the induced current to flow, it is supplied from the high frequency power supply. There is an advantage that power loss can be suppressed, and a decrease in light output from the electrodeless discharge lamp can be suppressed even when the power supplied to the high-frequency power supply is constant.

According to a second aspect of the present invention, there is provided an electrodeless discharge lamp filled with a discharge gas, an induction coil disposed in close proximity to the electrodeless discharge lamp, and a high-frequency electromagnetic wave connected to the induction coil and surrounding the induction coil. A high-frequency power supply that forms a field to excite the discharge gas to emit light, and a lamp body member in which a conductive film disposed close to the induction coil is adhered to a non-conductive base material; At least one gap that suppresses the induction current caused by electromagnetic induction from flowing into the conductive film is provided in the conductive film. Since the gap restricts the path of the induced current, the induced current becomes difficult to flow. The advantage is that the loss of the power supplied from the high-frequency power supply can be suppressed, and the reduction in the light output from the electrodeless discharge lamp can be suppressed even when the power supplied to the high-frequency power supply is constant. That.

The invention of claim 3 is the invention of claim 1 or claim 2.
In the above, the gap is provided close to the induction coil, and the induction current is blocked at a portion where the degree of coupling with the induction coil is large and the induction current is likely to flow. There is an advantage that the effect of suppressing the power loss caused by flowing into the air can be further enhanced.

According to a thirteenth aspect of the present invention, in the first to twelfth aspects, since the gap is formed in a single band shape, the gap restricts a path through which the induced current flows, so that the induced current hardly flows. In addition, there is an advantage that loss of power supplied from the high-frequency power supply can be suppressed.

According to a fourteenth aspect, in the first to twelfth aspects, the gap is formed radially about the center axis of the induction coil. Is divided into a plurality of regions, and the path through which the induced current flows is further restricted, making it difficult for the induced current to flow. Therefore, the effect of suppressing the power loss due to the flow of the induced current can be further enhanced. There are advantages.

According to a fifteenth aspect of the present invention, in any of the first to twelfth aspects, the gap formed between the radially centered portion and the annularly shaped portion around the central axis of the induction coil intersects with each other. Thus, the portion serving as the path of the induced current is divided into more areas than the configuration of claim 14, and the path through which the induced current flows is further restricted, so that the induced current flows. It will be difficult
There is an advantage that the effect of suppressing the power loss due to the induced current flowing through the lamp body member can be further enhanced.

According to a sixteenth aspect of the present invention, in the first to fifteenth aspects, the gap is formed so as to intersect with a direction in which the induced current flows, and the induced current flows through the lamp body member. Therefore, there is an advantage that power loss from the high-frequency power supply can be effectively suppressed.

According to a twentieth aspect, in the fifth aspect,
The gap is formed by performing masking when depositing a metal film, and has the advantage that the gap can be formed accurately and narrowly.

According to a twenty-first aspect of the present invention, there is provided an electrodeless discharge lamp filled with a discharge gas, an induction coil disposed in close proximity to the electrodeless discharge lamp, and a high-frequency electromagnetic wave connected to the induction coil and surrounding the induction coil. A high-frequency power supply that forms a field to excite the discharge gas to emit light, and a lamp body member having a conductive material disposed in proximity to the induction coil; The conductive material is provided with a gap that intersects the direction in which the conductive material flows and at least one end of the conductive material is opened, and the gap restricts the flow path of the induced current and makes it difficult for the induced current to flow. The loss of the power supplied from the power supply can be suppressed, and the decrease in the light output from the electrodeless discharge lamp can be suppressed even when the power supplied to the high-frequency power supply is constant. There is an advantage to say.

[Brief description of the drawings]

FIG. 1A is a schematic sectional view showing a first embodiment,
(B) It is a perspective view which shows the reflecting mirror used above.

FIG. 2 is a plan view of the same.

FIG. 3 is a circuit diagram of the same.

FIG. 4 is a plan view showing a reflecting mirror used in a second embodiment.

FIG. 5 is a plan view showing a reflecting mirror used in a third embodiment.

FIG. 6 is a schematic sectional view showing a fourth embodiment.

FIG. 7 is a plan view showing a reflecting mirror used in the embodiment.

FIG. 8 is a schematic sectional view showing a fifth embodiment.

FIG. 9 is a plan view showing a panel used in the above.

FIG. 10 is a schematic sectional view showing a sixth embodiment.

FIG. 11 is a perspective view showing a device main body used in the above.

FIG. 12 is a schematic sectional view showing a seventh embodiment.

FIG. 13 is an external view of the above.

FIG. 14 is a plan view showing a reflecting mirror used in the above.

FIG. 15 is a plan view showing a prism used in the eighth embodiment.

FIG. 16 is a schematic sectional view of a main part showing a ninth embodiment;

FIG. 17 is an external view of the above.

FIG. 18 is a schematic sectional view showing a tenth embodiment.

FIG. 19 is an external view of the above.

FIG. 20 is a schematic sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Electroless discharge lamp 11 Induction coil 12 High frequency power supply 20 Reflector 22 Instrument body 26a Gap 26b Gap 26c Gap 26d Gap 26e Gap 27 Induction current 28 Support 31 Transparent conductive film 34 Reflector 35 Prism 37 Reflector

Continuing from the front page (72) Inventor Shingo Masumoto 1048 Okadoma Kadoma, Kadoma, Osaka Prefecture Inside the Matsushita Electric Works, Ltd. Person Shigeki Matsuo 1048 Kazuma Kadoma, Kadoma City, Osaka Prefecture F-term in Matsushita Electric Works, Ltd. (reference) 3K072 AA16 BA05 CA11 DD05 GA03 GB03 GB12 HA05

Claims (21)

[Claims] 1. An electrodeless discharge lamp filled with a discharge gas,
An induction coil disposed in proximity to the electrodeless discharge lamp, a high-frequency power source connected to the induction coil, forming a high-frequency electromagnetic field around the induction coil to excite the discharge gas to emit light, and A lamp member made of a conductive material disposed therein, wherein at least one gap for suppressing an induction current caused by electromagnetic induction from the induction coil to flow into the lamp member is provided in the lamp member. A lighting fixture using an electrodeless discharge lamp as a light source. 2. An electrodeless discharge lamp filled with a discharge gas,
An induction coil disposed in proximity to the electrodeless discharge lamp, a high-frequency power source connected to the induction coil, forming a high-frequency electromagnetic field around the induction coil to excite the discharge gas to emit light, and A lamp member attached to a non-conductive base material, wherein the conductive film is disposed, and at least one gap for suppressing an induced current caused by electromagnetic induction from the induction coil to flow through the conductive film is provided. A lighting fixture using an electrodeless discharge lamp as a light source, the lighting fixture provided on a conductive film. 3. The lighting apparatus according to claim 1, wherein the gap is provided near the induction coil. 4. The electrodeless discharge lamp according to claim 1, wherein the lamp body member is a reflecting mirror that reflects light from the electrodeless discharge lamp in a target direction. And lighting equipment. 5. The electrodeless discharge lamp according to claim 2, wherein the conductive film is formed of a metal film and forms a reflector for reflecting light from the electrodeless discharge lamp in a target direction. And lighting equipment. 6. The lighting fixture according to claim 4, wherein the reflector is made of aluminum. 7. The lamp body member according to claim 1, wherein the lamp body member is at least a part of an appliance body that houses the electrodeless discharge lamp, the induction coil, and the high-frequency power supply. Lighting equipment using the electrodeless discharge lamp as a light source. 8. The electrodeless discharge lamp according to claim 1, wherein the lamp body member is provided on a side from which light is extracted from the electrodeless discharge lamp, and has a light transmitting property. Lighting equipment with a light source. 9. The electrodeless discharge lamp according to claim 2, wherein the conductive film is provided on a light extraction side of the electrodeless discharge lamp and is made of a transparent conductive oxide. Lighting equipment. 10. The lighting fixture using an electrodeless discharge lamp as a light source according to claim 8, wherein the lamp body member is formed in a planar shape. 11. The electrodeless discharge lamp according to claim 8, wherein the lamp body member is formed in a shape surrounding the electrodeless discharge lamp and the induction coil. And lighting equipment. 12. The lamp body member according to claim 8, wherein the lamp body member is a prism surrounding the electrodeless discharge lamp and the induction coil and dispersing light from the electrodeless discharge lamp. A lighting fixture using the electrodeless discharge lamp according to 1 above as a light source. 13. The lighting apparatus according to claim 1, wherein the gap is formed in a single band. 14. The electrodeless device according to claim 1, wherein the gap is formed radially around an intersection with a center axis of the induction coil. Lighting equipment using discharge lamps as light sources. 15. The gap is formed such that a portion formed radially and a portion formed in an annular shape centering on an intersection with a center axis of the induction coil intersect with each other. A lighting fixture using the electrodeless discharge lamp according to any one of claims 1 to 12 as a light source. 16. The electrodeless discharge lamp according to claim 1, wherein the gap is formed so as to intersect a direction in which the induced current flows. And lighting equipment. 17. An illuminating apparatus using an electrodeless discharge lamp as a light source according to any one of claims 1 to 16, wherein at least one end of the gap is open. 18. An apparatus according to claim 1, wherein one end of the gap close to the induction coil is open.
A lighting fixture using the electrodeless discharge lamp according to 7 as a light source. 19. The lighting apparatus according to claim 17, wherein both ends of the gap are open. 20. The electrodeless discharge lamp according to claim 5, wherein the gap is formed by performing masking when depositing a metal film forming the conductive film. And lighting equipment. 21. An electrodeless discharge lamp filled with a discharge gas, an induction coil disposed in proximity to the electrodeless discharge lamp,
A high-frequency power source connected to the induction coil to form a high-frequency electromagnetic field around the induction coil to excite and emit the discharge gas; and a lamp body member having a conductive material disposed close to the induction coil. An electrodeless discharge lamp, wherein a gap intersecting with a direction in which an induction current caused by electromagnetic induction from the induction coil flows through the conductive material and having at least one end opened is provided in the conductive material. Lighting equipment used as a light source.