KR100460329B1 - electrodeless discharge lamp - Google Patents

Abstract

The electrodeless discharge lamp of the present invention includes an envelope having a substantially hemispherical dome shape. The envelope is filled with an ionizable gas medium, and the inner surface is coated with a fluorescent layer. At least one magnetic core is located proximate to the outer lower portion of the flat bottom of the envelope. The magnetic flux entrance of the magnetic core is positioned to face a flat bottom, and the magnetic core is generally located within the flat bottom of the envelope. The winding is wound several times on the magnetic core, and both ends of the winding are electrically connected to a power source providing RF. When RF is applied from the power source to the winding, an induction magnetic field is generated and transmitted to the inside of the envelope through the magnetic core.Induction electric field is generated inside the envelope by the induction magnetic field, and the inert gases charged therein accelerate and collide with the electrodeless discharge. Is done. The electrodeless discharge lamp of the present invention can maximize the ionization energy transfer efficiency delivered to the ionizable gas medium filled inside the envelope, and is designed so as not to interfere with the light transmission region of the envelope to provide a high intensity induction lamp. It is possible to effectively dissipate heat generated by the magnetic core to obtain a stable effect.

Description

Electrodeless discharge lamp

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrodeless discharge lamp, and more particularly to an electrodeless discharge lamp having an improved structure of an envelope and a magnetic core so as to increase the discharge efficiency of the lamp. will be.

In general, an electrodeless discharge lamp has a lifespan of approximately 60,000 hours or more and is known to have a very long lifespan compared to a conventional fluorescent lamp. Therefore, it is mainly used in places where lamp replacement is expensive, for example, outdoor lighting, tunnel lighting, and industrial lighting.

As for the technology of the electrodeless discharge lamp, the patent registration number No. 1980-0001141 registered in Korea as of October 12, 1980, the electrodeless discharge lamp was published in Korea as of December 28, 1995, Publication No. 1995-0034396 Electrode fluorescent lamps; Such a conventional electrodeless discharge lamp is largely provided with a sealed spherical envelope including an ionizable gas medium and an induction winding for providing the gas medium with energy required for ionization (hereinafter referred to as ionization energy). The induction winding is inserted into a cavity formed in the center of the envelope to transfer ionization energy to the gas medium within the envelope.

The efficiency of an electrodeless discharge lamp depends on the ionization energy provided from the induction winding being effectively transferred to the gas medium in the envelope. Therefore, the set makers of electrodeless discharge lamps are trying to obtain the structure and circuit of the electrodeless discharge lamp that can transfer the ionization energy to the gas medium in the envelope as much as possible, and the structure of the envelope and the magnetic core is continuously improving. .

However, most of the electrodeless discharge lamps using the magnetic core have a structure in which only one direction of the magnetic core faces the inside of the envelope, resulting in low ionization energy transfer efficiency. In addition, since the magnetic core is inserted into the pupil formed in the envelope, heat generation of the magnetic core has been pointed out as a problem.

As disclosed in Korean Utility Model Publication No. 95-10169, an electrodeless discharge lamp, a winding may be wound around the outer circumferential surface of the envelope without using a magnetic core. However, in this case, a problem arises in which a part of the outer circumferential surface of the envelope is covered by the winding.

As such, the electrodeless discharge lamp is required to have a structure in which the structure can maximize the transfer efficiency of ionization energy, can effectively dissipate heat generated by the magnetic core, and does not interfere with the light transmission region of the envelope.

An object of the present invention is to provide an electrodeless discharge lamp having an envelope and a magnetic core structure capable of maximizing the ionization energy transfer efficiency transferred from the induction winding to the ionizable gas medium in the envelope.

Another object of the present invention is to provide an electrodeless discharge lamp having an envelope and a magnetic core structure capable of effectively releasing heat generated by the magnetic core.

It is still another object of the present invention to provide an electrodeless discharge lamp having an envelope and a magnetic core structure having a structure that does not interfere with the light transmitting region of the envelope.

1 is a perspective view of an electrodeless discharge lamp according to a first embodiment of the present invention;

2 and 3 are side and plan views of the electrodeless discharge lamp of FIG. 1;

4 is a perspective view of an electrodeless discharge lamp according to a modification of the first embodiment of FIG. 1;

5 and 6 are side and plan views of the electrodeless discharge lamp of FIG. 4;

7 is a view showing an example in which the electrical connection of the winding is modified in the electrodeless discharge lamp of FIG.

8 is a perspective view showing another modification of the electrodeless discharge lamp according to the first embodiment of the present invention;

9 and 10 are side and top views of the electrodeless discharge lamp of FIG. 8;

FIG. 11 is a perspective view illustrating an example in which a position of a magnetic core is modified in the electrodeless discharge lamp of FIG. 8; FIG.

12 and 13 are side and plan views of the electrodeless discharge lamp of FIG. 11;

14 is a perspective view of an electrodeless discharge lamp according to a second embodiment of the present invention;

15 and 16 are side and top views of the electrodeless discharge lamp of FIG. 14; And

17 is a top view of the magnetic core of FIG. 14.

* Description of the symbols for the main parts of the drawings *

10: Envelope 16: Reflective Layer

20: magnetic core 28: winding

30: RF power

According to a feature of the present invention for achieving the object of the present invention as described above, an envelope having a hemispherical dome shape, a fluorescent layer coated therein and filled with an ionizable gas medium, and an outer side of the flat bottom of the envelope. In the electrodeless discharge lamp having at least one magnetic core located below, a winding for magnetic induction wound around the magnetic core and a power supply electrically connected to both ends of the winding to provide a radio frequency (RF). The reflective layer is provided between the flat bottom surface of the envelope and the fluorescent layer, and the magnetic core has a horseshoe shape in which two magnetic flux entrances and exits face the flat bottom surface of the envelope, respectively.

(Example)

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are given to the components of the same function. In each of the drawings, parts other than the main elements for describing the present invention are briefly omitted or omitted, and parts of the present invention that are basically applicable to those skilled in the art are omitted. It is shown in the center. In particular, there are parts in which the size ratio between each component is somewhat different or the size between components coupled to each other is different. However, the difference in representation of the drawings may be easily understood by those skilled in the art. Since the parts can be understood, a detailed description thereof will be omitted.

The embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be construed as being limited by the embodiments described below. This embodiment is provided to explain more clearly the present invention to those skilled in the art.

(Basic example of Example 1)

1 is a perspective view of an electrodeless discharge lamp according to a first embodiment of the present invention, Figures 2 and 3 are a side view and a plan view of the electrodeless discharge lamp of Figure 1;

Referring to the drawings, the electrodeless discharge lamp according to the first embodiment of the present invention includes an envelope 10 having a hemispherical dome shape. The envelope 10 is filled with an ionizable gas medium, for example, an inert gas such as mercury, argon, halogen, or the like. A fluorescent layer 12 is coated on an inner surface of the envelope 10, and a reflective layer 16 may be formed between the flat bottom surface 14 of the envelope 10 and the fluorescent layer 12.

A horseshoe-shaped magnetic core 20 is located close to the outer bottom of the flat bottom surface 14. The magnetic flux entrances 22, 24 of the magnetic core 20 are located facing the flat bottom 14, and the length a and width b of the magnetic core 20 are smaller than the diameter of the flat bottom 14. . The winding 28 is wound several times on the central body 26 of the magnetic core 20. Both ends of the winding 28 are electrically connected to a power supply 30 that provides a radio frequency (RF).

In the electrodeless discharge lamp as described above, when RF is applied from the power supply 30 to the winding 28, an induction magnetic field is generated and transferred to the envelope 10 through the magnetic core 20. The induced magnetic field generates an induction electric field in the envelope 10, thereby causing ionization, that is, an electrodeless discharge, while the inert gases charged in the envelope 10 are accelerated and collided with each other.

The electrodeless discharge lamp according to the first embodiment of the present invention has a structure in which the magnetic core 20 is exposed to the outside of the envelope 10, so that the magnetic core 20 may be easily dissipated even when the magnetic core 20 generates heat. In addition, since the two magnetic flux entrances 22 and 24 of the magnetic core 20 are located in close proximity to the envelope 10, the magnetic flux 20 has an efficient structure to prevent the loss of magnetic flux as much as possible. That is, compared to the conventional structure in which a magnetic core is inserted into the envelope of the electrode, a heat generation problem generated in the case of the electrodeless discharge lamp and only one side of the magnetic flux entrance and exit face the envelope, so that magnetic flux loss occurs. The heat dissipation effect and the flux loss prevention effect can be obtained.

(First Modification of Example 1)

Next, an electrodeless discharge lamp according to a modification of the first embodiment of the present invention described above will be described in detail with reference to FIGS. 4 to 7. 4 is a perspective view of an electrodeless discharge lamp according to a modification of the first embodiment of FIG. 1, and FIGS. 5 and 6 are side and plan views of the electrodeless discharge lamp of FIG. 4.

Referring to the drawings, the electrodeless discharge lamp according to the modification of the first embodiment has an envelope 10 having a hemispherical dome shape as in the first embodiment described above. At least two horseshoe-shaped magnetic cores 40 and 44 are arranged in series close to the outer bottom of the flat bottom face 14. Each magnetic flux entrance 41, 42 (45, 46) of the two magnetic cores 40, 44 is located facing the flat bottom 14, and the overall length and width of the two magnetic cores 40, 44. Is smaller than the diameter of the flat bottom face 14.

Windings 48 are wound several times on the central bodies 43, 47 of each of the two magnetic cores 40, 44. Both ends of the winding 48 are then electrically connected to a power source 30 providing an RF frequency. In the electrodeless discharge lamp according to the modification of the first embodiment as described above, two magnetic cores 40 and 44 are exposed to the outside of the envelope 10 so that the two magnetic cores 40 and 44 easily dissipate heat even when the magnetic cores 40 and 44 generate heat. The magnetic flux entrances 41, 42, 45, 46 of the two magnetic cores 40, 44 are located in close proximity to the envelope 10 to prevent the loss of magnetic flux. Has

In addition, by arranging two magnetic cores 40 and 44 on the bottom of the envelope 10, ionization energy is dispersed and transferred to the inside of the envelope 10. Therefore, the effect of discharging evenly in the envelope 10 can be obtained.

Here, the windings 48 wound around the two magnetic cores 40 and 44 are respectively wound in the same direction, but may be wound in different directions to change the induction direction of the induction magnet. In this case, the collision efficiency between the inert gas particles can be made higher to increase the discharge efficiency.

In this embodiment, the windings 48 wound around the two magnetic cores 40 and 44 are electrically connected in series but may be connected in parallel. Furthermore, as shown in FIG. 7, windings 49a and 49b may be wound around two magnetic cores 40 and 44, respectively, and different power sources 32a and 32b may be connected to each other. As such, it is obvious to those skilled in the art that the electrical connection method of the windings and the power supply method can be variously modified.

(2nd modification of 1st Example)

8 is a perspective view illustrating another modified example of the electrodeless discharge lamp according to the first embodiment of the present invention, and FIGS. 9 and 10 are side views and plan views of the electrodeless discharge lamp of FIG. 8.

Referring to the drawings, the envelope 50 of the electrodeless discharge lamp according to another modification has a hemispherical dome shape extending in a long line. The envelope 50 is filled with an inert gas as described above. A fluorescent layer 52 is coated on the inner surface of the envelope 50, and a reflective layer 56 may be formed between the flat bottom surface 54 and the fluorescent layer 52 of the envelope 50.

The horseshoe-shaped magnetic cores 60, 70, and 80 are closely aligned at regular intervals in the longitudinal direction of the envelope 50, below the flat bottom surface 54. Each magnetic flux entrance 62, 64, 72, 74, 82, 84 of the magnetic cores 60, 70, 80 faces the flat bottom 54. A continuous winding 92 is wound several times on each central body 66, 76, 86 of the magnetic cores 60, 70, 80. Both ends of the winding 92 are electrically connected to a power supply 90 that provides RF.

In the electrodeless discharge lamp as described above, when RF is applied from the power supply 90 to the winding 92, an induction magnetic field is generated and transferred to the envelope 50 through the magnetic cores 60, 70, and 80. The induced magnetic field causes an induction electric field to be generated inside the envelope 50, thereby causing ionization, that is, electrodeless discharge, while the inert gases charged in the envelope 50 are accelerated to collide with each other.

In the electrodeless discharge lamp according to another modification described above, the magnetic cores 60, 70, and 80 may be arranged in parallel in a direction perpendicular to the longitudinal direction of the envelope 50, as shown in FIGS. 11 to 13. have.

As in the above-described embodiment, the winding 92 wound on the magnetic cores 60, 70, 80 of the electrodeless discharge lamp is wound in the same direction, but is wound in different directions to induce the induced magnetic. The directions of can be different. In this case, the collision efficiency between the inert gas particles can be made higher to increase the discharge efficiency.

In this embodiment, the windings 92 wound on the magnetic cores 60, 70, and 80 are electrically connected in series, but may be connected in parallel, and further, different power sources (not shown) in parallel. You can also connect As such, it is obvious to those skilled in the art that the electrical connection method of the windings and the power supply method can be variously modified.

(2nd Example)

14 is a perspective view of an electrodeless discharge lamp according to a second embodiment of the present invention, and FIGS. 15 and 16 are side and plan views of the electrodeless discharge lamp of FIG. 14. 17 is a plan view of the magnetic core of FIG. 14.

Referring to the drawings, the electrodeless discharge lamp according to the second embodiment of the present invention includes an envelope 100 having a hemispherical dome shape as in the first embodiment described above, and an inert gas therein. Is filled. In addition, a fluorescent layer 102 may be coated on an inner surface of the envelope 100, and a reflective layer 106 may be formed between the flat bottom surface 104 of the envelope 100 and the fluorescent layer 102.

A magnetic core 110 having a generally cylindrical shape is proximal to the lower portion outside the flat bottom surface 104. The diameter of the magnetic core 110 is smaller than the diameter of the flat bottom face 14 of the envelope 100. The magnetic core 110 includes a cylindrical first magnetic flux inlet 112 having a predetermined thickness and a second magnetic flux inlet 114 having a circular columnar shape formed inside the first magnetic flux inlet 112. The first and second magnetic flux entrances 112 and 114 are integrally formed. The winding 122 is wound several times on the outer surface of the second magnetic flux entrance 114, and a power supply for supplying RF through holes 118a and 118b formed between the first and second magnetic flux entrances 112 and 114. 120 is electrically connected.

Here, the top surface areas of the first and second magnetic flux entrances 112 and 114 are the same. That is, the radius of the second magnetic flux doorway 114 is r 1, the radius from the center of the second magnetic flux doorway to the inner circumferential surface of the first magnetic flux doorway 112 is r 2 and the first magnetic flux doorway ( When the radius to the outer circumferential surface of 112) is r 3, the following equation is established.

S_r1 = 2pir1 ^ 2, S_r2 = 2pir2 ^ 2, S_r3 = 2pir3 ^ 2,

S_r1 = S_r3-S_r2

In the electrodeless discharge lamp according to the second exemplary embodiment, when RF is applied from the power supply 110 to the winding 122, an induction magnetic field is generated and transferred to the envelope 100 through the magnetic core 110. As the induction field is generated inside the envelope 100 by the magnetic field, the charged inert gases accelerate and collide, resulting in ionization, that is, electrodeless discharge.

The electrodeless discharge lamp according to the second embodiment of the present invention also has a structure in which the magnetic core 110 is exposed to the outside of the envelope 100, as in the first embodiment described above. Even if it generates heat, it has a structure that can be easily radiated. In addition, since the two magnetic flux entrances 112 and 114 of the magnetic core 110 are located in close proximity to the envelope 100, the magnetic flux 110 has an efficient structure to prevent magnetic flux loss as much as possible.

Although the configuration and operation of the electrodeless discharge lamp according to the preferred embodiment of the present invention as described above are illustrated according to the above description and drawings, this is merely an example and is within the scope not departing from the technical spirit of the present invention. It will be understood by those skilled in the art that various changes and modifications are possible in the art.

According to the present invention as described above, it is possible to maximize the ionization energy transfer efficiency delivered to the ionizable gas medium filled inside the envelope, it is designed not to interfere with the light transmission region of the envelope to provide a high-intensity electrodeless lamp. Can effectively dissipate heat generated by the magnetic core can be used to obtain a stable effect.

Claims (6)

An envelope having a hemispherical dome shape and having a fluorescent layer coated therein and filled with an ionizable gas medium; In the electrodeless discharge lamp having a winding for induction and a power source electrically connected to both ends of the winding to provide a radio frequency (RF), And a reflective layer provided between the flat bottom surface of the envelope and the fluorescent layer, wherein the magnetic core has a horseshoe shape in which two magnetic flux entrances are respectively faced to the flat bottom surface of the envelope. delete delete delete delete delete