JPH1154090A - Electrodeless discharge lamp device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lessen the possibility of damaging a bulb at the time of attachment/ detachment of the bulb. SOLUTION: This device is equipped with an air-tight bulb 1, which is formed of a translucent material and filled with discharge gas inside and on the side of whose one end a recessed part 1a is formed, a base 4 fastened on the one end side of this bulb 1, an induction coil 2 inserted into the recessed part 1a and carrying a high-frequency current, substantially cylindrical metallic shielding plates 5 disposed so as to approximately shield a space between the induction coil 2 and a circumferential side wall of the recessed part 1a, and a device body part 6 which holds mechanically the base 4 of the bulb 1 and houses a lighting circuit part 3 for supplying the high-friquency current to the induction coil 2. Discharge is generated in the bulb 1 by causing a high-frequency electromagnetic field formed by the induction coil 2 to act on the discharge gas. The base 4 is formed in one body with the metallic shielding plates 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an electrodeless discharge lamp device.

[0002]

2. Description of the Related Art Conventionally, there has been known an electrodeless discharge lamp in which a high-frequency electromagnetic field is applied to a discharge gas sealed in a bulb to excite the discharge gas in the bulb to emit light. This type of electrodeless lamp is small, high power,
Due to its long service life and other features, it has been researched and developed in various places and has been put to practical use.

FIG. 7 shows a conventional electrodeless discharge lamp of this type. This electrodeless discharge lamp has a substantially cylindrical concave portion 1a formed on one end side of a bulb 1 in which a fluorescent substance is coated on an inner surface and a discharge gas containing mercury vapor is sealed therein.
An induction coil 2 through which a high-frequency current flows in the recess 1a.
A base 4 is fixedly attached to a peripheral end of a concave portion 1a, which is one end of the bulb 1, via a lighting circuit section 3 for supplying high-frequency power to the induction coil 2. . Then, a high-frequency current is applied to the induction coil 2 to cause a high-frequency electromagnetic field formed by the induction coil 2 to act on the discharge gas in the bulb 2 to excite the discharge gas to emit ultraviolet rays. Is converted into visible light by a phosphor applied to the inner surface of the light emitting device, and emitted to the outside of the bulb 1 for illumination.

Incidentally, in the induction coil 2 used in such an electrodeless discharge lamp, a strong electric field is generated between the lines of the induction coil 2. Then, ions and the like in the plasma collide with the inner wall of the bulb 2 due to the strong electric field, blackening the bulb 2 and shortening its life. Further, the induction coil 2 becomes high temperature due to self-heating and radiation of heat from the bulb 2, and the wire of the induction coil 2 is deteriorated.

FIG. 8 and FIG. 9 show another conventional electrodeless discharge lamp which has solved the above-mentioned disadvantages. In this electrodeless discharge lamp, a phosphor is applied to the inner surface, and a substantially cylindrical concave portion 1a is formed at one end of a bulb 1 in which a discharge gas containing mercury vapor is sealed. As shown in FIG. 9, the induction coil 2 to which a current is supplied is inserted and the space between the induction coil 2 and the peripheral wall of the concave portion 1 a is shielded.
And a metal cover plate 5 provided with a plurality of slits 5a as shown in FIG. 1 and a base 4 fixed to a peripheral end of a concave portion 1a which is one end of the valve 1. I have. One end of the induction coil 2 is connected to the induction coil 2.
The lighting circuit unit 3 is connected to a lighting circuit unit 3 that supplies high-frequency power to the lighting unit 3. The lighting circuit unit 3 is provided with a receiving unit 6a on one surface side of which the base 4 of the bulb 1 is mechanically engaged and held. It is configured to be housed in the main body 6.

Since the metal shield plate 5 is grounded, the slit 5a is used to allow electric lines of force generated by the induction coil 2 to cross the discharge space in the bulb 1 outside the metal shield plate 5. Although provided, the magnetic field of the induction coil 2 suppresses the eddy current from flowing in the circumferential direction of the metal shielding plate 5, and also acts to reduce the loss caused by the eddy current.

A high-frequency current is applied to the induction coil 2 to cause a high-frequency electromagnetic field formed by the induction coil 2 to act on the discharge gas in the bulb 2 to excite the discharge gas to emit ultraviolet rays. Is converted into visible light by a phosphor applied to the inner surface of the bulb 1 and emitted to the outside of the bulb 1 for illumination. Further, the valve 1 is detachable from the apparatus main body 6, and is removed by removing the base 4 from the receiving portion 6 a of the apparatus main body 6. At this time, the induction coil attached to the apparatus main body 6 2 and the metal shielding plate 5
Drawn from. Further, the bulb 1 is mounted on the apparatus main body 6 by inserting the induction coil 2 and the metal shielding plate 5 into the concave portion 1a of the bulb 1 from the tip side thereof and engaging the base 4 with the receiving portion 6a.

[0008]

However, in another conventional electrodeless discharge lamp device configured as described above, when the bulb 1 is mounted on the device main body 6, the bulb 1 is inserted into the recess 1a of the bulb 1. Since the metal shielding plate 5 is inserted, the peripheral wall of the concave portion 1a of the bulb 1 may be rubbed on the tip side of the metal shielding plate 5, and the bulb 1 may be damaged. There was a problem that there was a possibility. This fear increased as the number of times the valve 1 was attached to and detached from the apparatus main body 6 increased.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an electrodeless discharge lamp device which does not damage the bulb when the bulb is attached or detached.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to the first aspect of the present invention, wherein a discharge gas is sealed in the inside and a first end is formed. A valve having a concave portion formed therein, a base fixed to one end of the valve, an induction coil inserted into the concave portion and supplied with a high-frequency current, and a peripheral side wall of the concave portion and the induction coil. A device main body containing a substantially cylindrical metal shielding plate disposed so as to substantially shield the space, and a lighting circuit unit that mechanically holds the base of the bulb and supplies a high-frequency current to the induction coil. Department and
An electrodeless discharge lamp device in which a high-frequency electromagnetic field formed by the induction coil is caused to act on the discharge gas to discharge in the bulb, wherein the base and the metal shielding plate are integrally formed.

According to the second aspect of the present invention, the first aspect is provided.
In the electrodeless discharge lamp device according to the above, the induction coil,
The apparatus is characterized in that it is configured to be detachable from the apparatus main body and is held by the base or the metal shielding plate, and that a contact point electrically connected to the induction coil is provided on a surface of the apparatus main body.

According to the third aspect of the present invention, there is provided the first aspect.
In the electrodeless discharge lamp device according to the above, the induction coil,
The device is configured to be detachable from the device main body and held by the base or the metal shielding plate, and the induction coil is configured to be supplied with power by electromagnetic coupling with the lighting circuit unit. I do.

According to a fourth aspect of the present invention, in the electrodeless discharge lamp device according to any one of the first to third aspects, the base integrally formed with the metal shielding plate includes:
A radiating fin is provided.

[0014]

FIG. 1 shows a first embodiment of an electrodeless discharge lamp device according to the present invention. This electrodeless discharge lamp device comprises a bulb 1, an induction coil 2, and a base 4; , A metal shielding plate 5, and a device main body 6.

The bulb 1 is formed in a substantially spherical shape from a light-transmitting material such as glass, and has a recess 1a which is recessed from the outer surface of the bulb 1 toward the center at one end thereof. Is provided with a tubular portion 1b having a height not protruding from the concave portion 1a and protruding toward one end of the bulb 1. That is, the valve 1 is closed by a bottom plate provided with an opening at one end of an outer tube 1c having a substantially spherical shape, and the other end of which is provided with a tubular portion 1b at a substantially central portion protruding toward one end. The cylindrical body 1d is inserted and the opening is closed, and an airtight space 1e is formed in a portion surrounded by the substantially spherical outer tube 1c and the cylindrical body 1d. I have.

Further, the distal end of the tubular portion 1b is provided so as to protrude from the opening side of the concave portion 1a, and communicates with the airtight space 1e of the valve 1 to be used for exhausting the airtight space 1e and filling discharge gas into the airtight space 1e. An exhaust pipe 1f which is closed thereafter is provided, and at least an inner surface of the substantially spherical outer pipe 1c is coated with a phosphor to form a phosphor layer 1g. A rare gas such as argon or krypton and at least mercury are sealed as a discharge gas in the hermetic space 1e inside the bulb 1.

The induction coil 2 is an air-core coil formed so as to protrude from one surface side of the apparatus main body 6, and is inserted into the concave portion 1a of the valve 1 so that the tubular portion of the valve 1 is inserted into the center of the coil. The portion 1b is formed to have a size that allows insertion, and a high-frequency current is made to flow therethrough.

The base 4 is mounted on one end side of the valve 1 and around the opening side of the concave portion 1a so that the valve main body 6 is mechanically held by the apparatus main body 6. The metal shielding plate 5 is formed integrally with the base 4 and is fixed to the bulb 1. The metal shielding plate 5 is inserted into the concave portion 1a to substantially shield between the peripheral side wall of the concave portion 1a and the induction coil 2. A plurality of slits 5a are provided in the axial direction from an end on the back side of the concave portion 1a on the tip side.

The metal shielding plate 5 causes ions in the plasma to be removed by the strong electric field generated by the induction coil 2.
This shield plate is provided to prevent the phosphor layer 1g and the bulb 1 from being degraded and blackened due to an impact upon collision. The metal shielding plate 5 is grounded. I have.
The metal shield plate 5 prevents the radiant heat from the bulb 1 to the concave portion 1a side and radiates the heat generated by the induction coil 2 inside the valve 1 so as to suppress the deterioration of the induction coil 2. Also, a slit 5a provided in the metal shielding plate 5
Is provided in order to allow the lines of electric force generated in the induction coil 2 to cross the discharge space in the bulb 1 outside the metal shield plate 5, but the eddy current is generated by the magnetic field of the induction coil 2. It also works to reduce the loss caused by the eddy current by suppressing the metal shield plate 5 from flowing in the circumferential direction.

The apparatus main body 6 is provided with a receiving portion for mounting the bulb 1 on one surface side, and has a lighting circuit portion 3 therein.
Is configured to be accommodated. This lighting circuit section 3
Is composed of a high-frequency power supply (not shown) for supplying high-frequency power to the induction coil 2 and a matching circuit section 3a provided between the high-frequency power supply and the induction coil 2, and is not particularly limited. In the embodiment, the matching circuit section 3a is housed in the apparatus main body section 6, and the high-frequency power supply is connected to the matching circuit section 3a by the electric wire 7.

With such a configuration, in the electrodeless discharge lamp device of the present embodiment, the metal shielding plate 5 inserted into the concave portion 1a of the bulb 1 is fixed to the bulb 1 integrally with the base 4. Therefore, the metal shielding plate 5 only needs to be inserted into the concave portion 1a only once at the time of manufacture of the lamp, so that it is not necessary to insert the metal shielding plate 5 into the concave portion 1a when replacing the bulb 1, and the possibility of damaging the bulb 1 is reduced. As a result, the reliability of the electrodeless discharge lamp is improved.

FIG. 3 shows a second embodiment of the electrodeless discharge lamp device according to the present invention.
This embodiment is different from the first embodiment in that the induction coil 2 is connected to the matching circuit section 3a of the lighting circuit section 3 via a contact 6b provided on one surface side of the apparatus main body 6. Electrically connected, and mechanically holding the induction coil 2 to the base 4 or a metal shielding plate 5 integrally formed with the base 4 so that the induction coil 2 can be detached from the apparatus main body 6.
The radiation fins 8 are provided so as to cover the periphery of the base 4 formed integrally with the metal shielding plate 5, and the other configuration is the same as that of the first embodiment.

With this configuration, the same effects as those of the first embodiment can be obtained, and the heat from the bulb 1 and the heat from the induction coil 2 are radiated by the radiating fins 8.
The heat can be hardly transmitted to the lighting circuit unit 3 side. Also,
Since the position and the shape of the induction coil 2 and the metal shielding plate 5 are fixed, the effect that the impedance is fixed and matching can be easily achieved is also achieved.

FIG. 4 shows a third embodiment of the electrodeless discharge lamp device according to the present invention.
This embodiment is different from the first embodiment in that the induction coil 2 is mechanically held by a base 4 or a metal shielding plate 5 formed integrally with the base 4 to form an apparatus main body. And the induction coil 2
In addition, power is supplied by electromagnetic coupling with the lighting circuit unit 3 housed in the device main body unit 6 via a part indicated by 9 in FIG. The configuration is the same as that of the embodiment.

With this configuration, the same effects as those of the first embodiment can be obtained, and the positions and shapes of the induction coil 2 and the metal shielding plate 5 are fixed, so that the impedance is fixed and the matching is achieved. Easy to take. In addition, since power is supplied to the induction coil 2 by electromagnetic coupling with the lighting circuit unit 3, there is no need to provide a contact for connecting the induction coil 2 to the device main unit 6, and the connection reliability of the induction coil 2 is improved. Is improved.

FIG. 5 shows a fourth embodiment of the electrodeless discharge lamp device according to the present invention.
This embodiment is different from the first embodiment in that a gap 10 is secured between the base 4 and a metal shielding plate 5 formed integrally with the base 4 and the apparatus main body 6. hand,
The point is that the base 4 is fixed to the apparatus main body 6 with, for example, screws 11 and the like, and that the radiation fins 8 are provided so as to cover the circumference of the base 4 formed integrally with the metal shielding plate 5. The configuration is the same as that of the first embodiment.

With this configuration, the same effects as those of the first embodiment can be obtained, and the heat from the bulb 1 and the heat from the induction coil 2 are radiated by the radiating fins 8.
The heat can be hardly transmitted to the lighting circuit unit 3 side. Also,
Since there is a gap 10 between the induction coil 2 or the metal shield plate 5 and the apparatus main body 6, the gap 10 makes it easier for the base 4 and the metal shield plate 5 to be cooled, thereby improving the heat radiation from the radiation fins 8. In addition, heat from the bulb 1 and heat from the induction coil 2 can be hardly transmitted to the lighting circuit unit 3 side.

[0028]

According to the present invention, the metal shielding plate inserted into the concave portion of the valve is fixed to the valve integrally with the base. Therefore, the metal shield plate only needs to be inserted into the recess once when manufacturing the lamp, eliminating the need to insert the metal shield plate into the recess when replacing the bulb, reducing the risk of damaging the bulb and reducing the reliability of the electrodeless discharge lamp. The performance is improved.

According to the second aspect of the present invention, the first aspect is provided.
In addition to the effects of the described invention, the positions and shapes of the induction coil and the metal shielding plate are fixed, so that the impedance is fixed and matching can be easily achieved.

[0030] According to the third aspect of the present invention, the first aspect is provided.
In addition to the effects of the described invention, since power is supplied to the induction coil by electromagnetic coupling with the lighting circuit unit, there is no need to provide a contact for connecting the induction coil to the device main body, and the connection of the induction coil is not required. Reliability is improved.

According to the fourth aspect of the present invention, in addition to the effects of the first to third aspects, heat from the bulb and heat from the induction coil are radiated by the heat radiation fins. Thus, the heat can be hardly transmitted to the lighting circuit portion side.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a first embodiment of an electrodeless discharge lamp device of the present invention.

FIG. 2 is a schematic diagram showing a state in which the valve is removed from a main body of the apparatus.

FIG. 3 is a schematic view showing a second embodiment of the electrodeless discharge lamp device of the present invention.

FIG. 4 is a schematic view showing a third embodiment of the electrodeless discharge lamp device of the present invention.

FIG. 5 is a schematic view showing a fourth embodiment of the electrodeless discharge lamp device of the present invention.

FIG. 6 is a schematic view showing a conventional electrodeless discharge lamp device.

FIG. 7 is a schematic view showing another conventional electrodeless discharge lamp device.

FIG. 8 is a perspective view showing a main part of the metal shielding plate according to the third embodiment.

FIG. 9 is a schematic diagram showing a state where the valve is removed from the apparatus main body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve 1a recess 2 Induction coil 3 Lighting circuit part 4 Base 5 Metal shielding plate 6 Device main body 6b Contact 8 Radiation fin

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Jun Matsuura 1048 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Works Co., Ltd. 72) Inventor Kenji Kawano 1048 Kazuma Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Works, Ltd.

Claims (4)

[Claims] 1. A bulb formed of a translucent material, in which a discharge gas is sealed and a recess is formed at one end, a base fixed to one end of the bulb, and a bulb inserted into the recess. An induction coil through which a high-frequency current is supplied, a substantially cylindrical metal shielding plate disposed so as to substantially shield between a peripheral side wall of the recess and the induction coil, and a base of the valve, And a lighting device for supplying a high-frequency current to the induction coil. The device main body includes a lighting circuit unit for supplying a high-frequency current to the induction coil. An electrodeless discharge lamp device in which discharge is performed inside, wherein the base and the metal shielding plate are integrally formed. 2. The induction coil is configured to be detachable from the apparatus main body and held by the base or the metal shielding plate, and is electrically connected to the induction coil on the surface of the apparatus main body. The electrodeless discharge lamp device according to claim 1, wherein a contact is provided. 3. The induction coil is configured to be detachable from the apparatus main body and held by the base or the metal shield plate, and power is supplied to the induction coil by electromagnetic coupling with the lighting circuit unit. The electrodeless discharge lamp device according to claim 1, wherein the electrodeless discharge lamp device is configured to be operated. 4. The electrodeless discharge lamp device according to claim 1, wherein a radiation fin is provided on a base formed integrally with the metal shielding plate.