JP2006012630A - Electrodeless discharge lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrodeless discharge lamp capable of protecting an exhaust pipe and a bobbin. <P>SOLUTION: The electrodeless discharge lamp comprises a bulb 10 made of translucent material having a hollow part 11 of bottomed cylindrical shape along one axis in which a discharge gas is filled; an exhaust pipe 12 evacuating the bulb 10, communicating with the bulb at the bottom pare 11a of the hollow part 11, arranged at the hollow part 11 along the one axis; a base 13 of which one part has a gap 14 between the peripheral part of the opening part 11b of the hollow part 11 and itself, and the other part supports and fixes the bulb 10; a coil 21 generating a high frequency electromagnetic field in the bulb 10 by being supplied with electrical current and exciting the discharge gas; and a bobbin 20 comprising a cylindrical main part 201 making the coil 21 contact the outer periphery, an annular flange part 202 provided at one end of the outer periphery, and a projection part 203 of cylindrical shape protruding from the flange part 202 in the axial direction of the main part 201 with a length longer than the gap 14, freely inserted into and taken out from the hollow part 11 so as to allow the exhaust pipe 12 come in and out inside the main part 201. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electrodeless discharge lamp that emits light by exciting a discharge gas by generating a high-frequency electromagnetic field in the bulb by energizing a coil without having an electrode in the bulb enclosing the discharge gas, for example. is there.

  Conventionally, this type of electrodeless discharge lamp is composed of a lamp part and a coupler (induction coil device), and for example, by applying a high-frequency electromagnetic field to the discharge gas sealed in a bulb (airtight container), Exciting and emitting light are known. The electrodeless discharge lamp has features such as small size, high output, and long life, and therefore research and development are actively conducted.

  The coupler used in such an electrodeless discharge lamp has a structure as shown in Patent Document 1, and it is very difficult to determine the winding position of the coil (induction coil) when manufacturing the coupler. There was a problem of being. Therefore, the authors improved the structure in which the resin bobbin 20 is provided in the coupler 2 and the coil 21 is attached to the recess 201a of the bobbin 20 as shown in FIG. The strength of 2 could be increased.

In addition, a flange 202 is provided at one end of the main body 201 of the bobbin 20 in order to prevent axial misalignment between the central axis of the cavity 11 (see FIG. 1) of the lamp unit 1 and the central axis of the coupler 2. It was.
Japanese Unexamined Patent Publication No. 2004-119038 (pages 4 to 8 and FIG. 1)

  However, in the above conventional electrodeless discharge lamp or the like, when the bulb (airtight container) 10 is inserted into the bobbin 20, as shown in FIG. There is a problem that the flange 202 contacts the base 13 or the exhaust pipe 12 contacts the inner wall of the bobbin 20 by entering the gap 14 between the base and the base (fitting member) 13.

  The present invention has been made in view of the above points, and an object thereof is to provide an electrodeless discharge lamp capable of protecting an exhaust pipe and a bobbin.

  According to the first aspect of the present invention, an airtight container having a bottomed cylindrical cavity along one axis, which is formed of a light-transmitting material and in which discharge gas is enclosed, and a bottom of the cavity An exhaust pipe that communicates with the hermetic container and is disposed in the hollow portion along the one axis, and that evacuates the hermetic container, a part of the peripheral portion on the opening side of the hollow portion, and the one shaft A base having a separation distance in the direction, the other part supporting and fixing the hermetic container, and a coil that generates a high-frequency electromagnetic field in the hermetic container when energized to excite the discharge gas, A cylindrical main body that circumscribes the coil on the outer peripheral surface, an annular flange that is provided around one end of the outer peripheral surface, and a cylindrical protrusion that protrudes from the flange longer than the separation distance in the axial direction of the main body. And the exhaust pipe enters and exits the inside of the main body. Manner, characterized in that it comprises a bobbin removably inserted into the cavity.

  In this configuration, when the hermetic container is inserted into the bobbin, the bobbin's collar or protrusion can be prevented from entering between the hermetic container and the base, so that the exhaust pipe and the bobbin can be protected. it can.

  According to a second aspect of the present invention, in the first aspect of the present invention, the outer diameter of the protruding portion is longer than the outer diameter of the coil. In this configuration, when the hermetic container is inserted into the bobbin, the hermetic container is not in contact with the coil, so that the coil can be protected without being damaged.

  According to the present invention, the exhaust pipe and the bobbin can be protected.

  First, the basic configuration of the present embodiment will be described with reference to FIGS. The electrodeless discharge lamp of the present embodiment is lit by a discharge gas being excited by a high frequency electromagnetic field, and includes a lamp unit 1 and a coupler 2 as shown in FIG.

  The lamp unit 1 includes a bulb 10 and a base 13. The bulb 10 is formed of a translucent material such as translucent glass, and has a bottomed cylindrical cavity (cavity) 11 along one axis (vertical direction in FIG. 1). The peripheral portion of the opening portion 11b of the hollow portion 11 has a sealing portion 100 where the outer surface 10a of the bulb 10 and the inner wall 11c of the hollow portion 11 are joined, and the inside of the bulb 10 is hermetically sealed. Yes. The inside of the bulb 10 is filled with a discharge gas. When a high-frequency electromagnetic field is generated, the discharge gas is discharged and plasma is generated. The discharge gas is an ionizable gas including, for example, mercury, a rare gas, a metal halide, and the like. The inside of the bulb 10 is coated with a phosphor and a protective film. The discharge gas is not limited to the above, and other gases and metals may be used.

  Moreover, the valve | bulb 10 forms the groove part 101 for engaging with the claw part 131 of the nozzle | cap | die 13 mentioned later on the outer periphery. The groove portion 101 is manufactured with a constant length t from the valve top 10b to the end portion 101a. However, the length x from the end portion 101a to the sealing portion 100 generally recognizes a variation in a predetermined range in consideration of mass productivity. Ideally, the length x may be equal to the distance D from the end portion 101a of the groove portion 101 to the protrusion 130 of the base 13 described later, and in this case, the gap 14 having a separation distance is reduced. . However, when the length x is longer than the distance D, the groove portion 101 and the pawl portion 131 cannot be engaged with each other. Therefore, the length x is designed to be shorter than the distance D in consideration of the variation.

  When a high-frequency electromagnetic field is generated inside the bulb 10, the discharge gas is ionized by the high-frequency electromagnetic field to generate electrons, the electrons collide with the atoms of the discharge gas, and the discharge gas is ionized. New electrons are generated. The electrons generated in this way receive energy by a high-frequency electromagnetic field and collide with the atoms of the discharge gas to give energy. Due to such collision, the atoms of the discharge gas repeat excitation and relaxation, and emit light when the excited atoms relax.

  The exhaust pipe 12 communicates with the valve 10 at the bottom part 11a of the cavity part 11 by welding or the like, and is disposed along one axis in the cavity part 11. When the valve 10 is manufactured, the valve 10 is evacuated.

  The base 13 is formed of, for example, a resin, a metal material, or the like, includes a protrusion 130 and a claw 131, and is provided at a lower portion of the valve 10. The base 13 forms a gap 14 having a separation distance in the axial direction (vertical direction in FIG. 1) with the sealing portion 100 in the protrusion 130. The claw 131 protrudes from a plurality of locations (for example, a location that divides the inner circumference into three equal parts) on the inner peripheral surface of the base 13, and engages with the groove 101 to support and fix the valve 10. Further, the base 13 includes a fitting portion 132 having a notch (not shown) in part. The fitting portion 132 is fitted to a fitting portion 200a of the bobbin 20 described later by rotating the base 13.

  The coupler 2 has high-frequency electromagnetic field generating means including a coil 21, a core 22, and a heat conductor (cylinder) 23. The coupler 2 is inserted into the cavity 11 and energizes a high-frequency current from a high-frequency power source (not shown) including a lighting circuit, thereby generating a high-frequency electromagnetic field inside the bulb 10, thereby exciting the discharge gas. To emit light.

  The coil 21 is formed, for example, by winding a conductive wire such as copper or copper alloy a plurality of times, supported by a body portion 201 of a bobbin 20 described later, and energized with a high-frequency current from the high-frequency power source (not shown). Then, a high frequency electromagnetic field is generated inside the bulb 10, and the discharge gas in the bulb 10 is ionized and thereby excited. Here, the frequency of the high-frequency electromagnetic field is not limited and is appropriately set according to the application, and is 13.65 MHz in the present embodiment.

  The core 22 is formed of a material having good high-frequency magnetic characteristics, such as a soft magnetic material, and has a cylindrical shape in which two pairs of crescent-shaped strips are combined vertically, and the main body of the bobbin 20 described later. It is installed in the part 201 and efficiently generates a high frequency electromagnetic field from the coil 21. Specific examples of the material include Mn—Zn ferrite and NiZn ferrite. The core 22 is in contact with the heat conductor 23 in a substantially planar shape. The core 22 is not limited to the above-described configuration and shape as long as it efficiently generates a high-frequency electromagnetic field from the coil 21, and may be one cylindrical shape, or a number different from the above. It may be composed of these parts.

  The heat conductor 23 is formed of a material having high heat conductivity such as aluminum, copper, or an alloy thereof, and includes three cylindrical portions having different outer diameters, and extends along the inner peripheral surface of the bobbin 20. Provided to hold the core 22 while dissipating heat. Further, the lower side of the heat conductor 23 and the base 24 are screwed together by screws 240 at a plurality of places such as three places. The heat conductor 23 is not limited to the above shape as long as it holds the core 22 while radiating heat.

  The bobbin 20 is made of, for example, resin, and includes a base part 200, a main body part 201, a flange part 202, and a protruding part 203, and the hollow part 11 so that the exhaust pipe 12 enters and exits the inside of the main body part 201. It can be inserted and removed freely. The base portion 200 includes a fitting portion 200a that protrudes from the outer peripheral surface. When the fitting part 200 a is inserted into the bobbin 20, the fitting part 200 a sandwiches the fitting part 132 from a notch (not shown) of the fitting part 132 of the fitting 13 and rotates the fitting 13. The mating part 132 is fitted.

  The main body 201 has a cylindrical shape, and has a concave portion 201a that circumscribes and supports the coil 21 on the outer peripheral surface, and a concave portion 201b that indents and supports the core 22 on the inner peripheral surface. The collar portion 202 is provided around one end of the outer peripheral surface of the main body portion 201 to form an annular shape, and prevents axial misalignment between the central axis of the cavity portion 11 and the central axis of the coupler 2.

  As shown in FIG. 2, the protruding portion 203 protrudes from the flange portion 202 in the axial direction of the main body portion 201 (vertical direction in FIG. 2) to form a cylindrical shape. As shown in FIG. 3, the length a of the protrusion 203 in the axial direction of the main body 201 is longer than the length a ′ of the gap 14 in the axial direction of the main body 201 (a> a ′). Further, the outer diameter b of the protruding portion 203 is longer than the outer diameter b ′ of the coil 21 (b> b ′).

  Next, in the present embodiment, attachment of the lamp unit 1 to the coupler 2 will be described. First, as shown in FIG. 3, the opening portion 11 b of the cavity portion 11 is brought closer to the protruding portion 203 side of the coupler 2 so that the exhaust pipe 12 is located inside the bobbin 20 and the bobbin 20 is located in the cavity portion 11. The lamp unit 1 is inserted into the coupler 2. As shown in FIG. 1, the lamp portion 1 is inserted into the coupler 2 until the fitting portion 132 is at the same height as the position of the fitting portion 200 a, and then the base 13 is rotated to fit the fitting portion 132. The fitting is completed by fitting the joint portion 200a. At the time of attachment, the bobbin 20 includes the protruding portion 203, so that the flange portion 202 and the protruding portion 203 do not enter the gap 14.

  As described above, according to the present embodiment, when the lamp portion 1 is inserted into the coupler 2, it is possible to prevent the flange portion 202 or the protruding portion 203 of the bobbin 20 from entering the gap 14. 20 can be protected. Further, the outer diameter b of the protruding portion 203 is larger than the outer diameter b ′ of the coil 21, so that when the lamp portion 1 is inserted into the coupler 2, the bulb 10 does not contact the coil 21, so that the coil 21 is not damaged. Can be protected.

It is sectional drawing of the electrodeless discharge lamp of embodiment by this invention. It is a perspective view which shows a part of coupler same as the above. It is a figure for demonstrating attachment to the coupler of a lamp part same as the above. It is sectional drawing of a coupler in the conventional electrodeless discharge lamp. It is a figure for demonstrating attachment to the coupler of a lamp part same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lamp part 10 Valve | bulb part 11 Cavity part 12 Exhaust pipe 13 Base 14 Crevice 2 Coupler 20 Bobbin 201 Main body part 202 Gutter part 203 Projection part 21 Coil

Claims (2)

An airtight container that is filled with a discharge gas and is formed of a translucent material, and has a bottomed cylindrical cavity along one axis;
An exhaust pipe that communicates with the hermetic container at the bottom of the cavity and is disposed along the one axis in the cavity and evacuates the hermetic container;
A part of which has a separation distance in the one axial direction with the peripheral part on the opening side of the hollow part, and the other part supports and fixes the airtight container;
A coil that generates a high-frequency electromagnetic field in the hermetic container when energized and excites the discharge gas, and
A cylindrical main body that circumscribes the coil on the outer peripheral surface, an annular flange that is provided around one end of the outer peripheral surface, and a cylindrical protrusion that protrudes from the flange longer than the separation distance in the axial direction of the main body. An electrodeless discharge lamp comprising a bobbin including a bobbin that can be inserted into and removed from the cavity so that the exhaust pipe enters and exits the inside of the main body.   The electrodeless discharge lamp according to claim 1, wherein an outer diameter of the protruding portion is longer than an outer diameter of the coil.

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