KR100806361B1 - Electrodeless lamp - Google Patents

Abstract

An electrodeless lamp is provided to improve heat radiating efficiency of a base structure by forming the base structure using a single material with high heat conductivity. An electrodeless lamp includes an envelope, a base structure(40), a rod(50), a magnetic material(60), and a coil(80). A fluorescent material is applied on an inner wall of the envelope, which includes a discharge tube at an inner center thereof. Discharge gas fills in the envelope. The base structure includes a cylinder and a mount. The cylinder is tightly contacted with a side end of the envelope. The mount is connected to the cylinder. The rod is coupled with the mount and arranged on an inner center axis of the discharge tube. The magnetic material is formed on an outer surface of the rod inside the discharge tube. The coil is arranged to be wound around the magnetic material. The cylinder and the mount are integrated into one entity. The base structure is made of a heat conductive material. A power line hole is formed on the mount of the base structure.

Description

Electrodeless lamp {Electrodeless lamp}

1 is a schematic exploded perspective view showing a base structure of an electrodeless lamp according to an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of the base structure of FIG. 1. FIG.

3 is a schematic cross-sectional view taken along line III-III of FIG. 1.

4 is a schematic enlarged perspective view illustrating a base structure of an electrodeless lamp according to another embodiment of the present invention.

5 is a schematic cross-sectional view showing an electrodeless lamp including the base structure shown in FIG. 1 of the present invention.

6 is a schematic cross-sectional view showing an electrodeless lamp according to still another embodiment of the present invention.

<Brief description of symbols for the main parts of the drawings>

40, 140: base structure 41, 141, 1041, 2041: cylindrical portion

42, 142, 1042, 2042: base 43, 143: power cable outlet

44, 144, 1044, 2044: fastener 45, 145, 1045, 2045: fastener

46, 1046, 2046: fixing part 47, 1047, 2047: heat dissipation space

50, 1050, 2050: Rod 60, 1060, 2060: Magnetic material

65, 1065: spring 70, 1070: sleeve

80, 1080, 2080: coil 1000, 2000: electrodeless lamp

1100 and 2100: envelopes 1105 and 2105: discharge tubes

The present invention relates to an electrodeless lamp, and more particularly, to an electrodeless lamp in which heat dissipation characteristics are improved, durability is improved, and assembly is easy.

The electrodeless lamp includes an envelope coated with a fluorescent material on an inner wall, and includes a rare gas containing a rare gas, and a discharge tube in the center of the envelope. And a magnetic body structure is arrange | positioned at a discharge tube. The magnetic body structure includes a magnetic body and a coil. When a predetermined voltage is applied to the coil, an induction magnetic field is formed between the coil and the magnetic body. This induced magnetic field discharges the rare gas in the envelope to produce visible light by the inductively coupled plasma.

Induction lamps have a high lamp efficiency and a long lifespan compared to conventional hot cathode lamps using heating filaments.

When the electrodeless lamp is used, the discharge occurs internally, so that the temperature of the electrodeless lamp increases as a whole. At this time, heat is transferred to the base structure surrounding the envelope of the electrodeless lamp. The base structure is formed by combining a plurality of members, and each of the plurality of members is formed of different materials. That is, the disk portion that is coupled to the rod of the member of the base structure is made of a metal material, the cylindrical portion is coupled to the envelope is formed of a synthetic resin material. In this case, heat is not easily released through the synthetic resin material, so most of the heat is released to the disk portion of the metal material. However, the disk portion has a relatively small area and the effect of heat dissipation using only the disk portion is small because the separate parts for installing the air and the outside during the subsequent process are combined. As a result, when the electrodeless lamp is used, the heat dissipation of the electrodeless lamp is not properly achieved only through the disc portion. Since the heat dissipation is not smooth, the temperature of the electrodeless lamp is increased. The electrodeless lamp uses a gas discharge by an induction magnetic field, so a large amount of heat is generated when generating visible light. The electrodeless lamp contains a magnetic material for discharge. If the magnetic material rises above the Curie point temperature, which is a critical temperature, it is difficult to exhibit performance. When the temperature rises, the performance of the magnetic body is degraded and the efficiency of the electrodeless lamp is decreased, thereby decreasing the luminance characteristics of the electrodeless lamp and increasing the power consumption. In addition, when the temperature of the electrodeless lamp increases, the cylindrical portion made of synthetic resin is deformed. In this case, the joint between the cylindrical portion and the envelope is loosened, and the bonding force between the members is weakened, and the electrodeless lamp is easily damaged.

The present invention can provide an electrodeless lamp having improved heat dissipation and improved robustness.

The present invention is an envelope coated with a fluorescent material on the inner wall and filled with a discharge gas and having a discharge tube in the inner center, a cylindrical portion closely attached to the side end portion of the envelope, a support portion connected to the cylindrical portion on one side of the cylindrical portion The cylindrical portion and the support portion is provided with a base structure formed of a thermally conductive member, a rod coupled to the support portion, disposed on the inner central axis of the discharge tube, a magnetic body formed on the outer surface of the rod to be located inside the discharge tube And a coil disposed to be wound around the outside of the magnetic material.

In the present invention, the cylindrical portion and the support portion may be formed as an integral member.

In the present invention, the cylindrical portion and the support portion may include a metal, and may include any one selected from the group consisting of copper, aluminum, stainless, and brass.

In the present invention, a plurality of heat dissipation protrusions may be formed on the outer circumferential surface of the cylindrical portion.

In the present invention further comprises a rod, the rod and the support may be coupled.

In the present invention may further include a sleeve surrounding the rod.

Hereinafter, with reference to the embodiments of the present invention shown in the accompanying drawings will be described in detail the configuration and operation of the present invention.

1 is a schematic exploded perspective view illustrating a base structure of an electrodeless lamp according to an embodiment of the present invention, and FIG. 2 is an enlarged perspective view illustrating the base structure of FIG. 1. 3 is a schematic cross-sectional view taken along line III-III of FIG. 1.

The base structure 40 of the electrodeless lamp includes a cylindrical portion 41 and a support portion 42. The cylindrical portion 41 and the supporting portion 42 are formed of a thermally conductive member. The cylindrical portion 41 and the support portion 42 may be formed of a metal having good thermal conductivity so that heat dissipation is easily performed by the base structure 40. The cylindrical portion 41 and the support portion 42 may be formed to include any one selected from the group consisting of copper, aluminum, stainless steel, and brass.

The cylindrical portion 41 and the support portion 42 can be formed in an integral structure. The cylindrical portion 41 and the support portion 42 may be integrally formed using a casting or pressing method, but may be integrally formed using various other methods.

Conventionally, the cap portion corresponding to the cylindrical portion 41 of the base structure 40 is formed of synthetic resin, and the disk portion corresponding to the support portion 42 is formed of metal. However, in the present invention, since the cylindrical portion 41 and the supporting portion 42 are formed of a thermally conductive member, heat generated from the electrodeless lamp is discharged through the cylindrical portion 41 and the supporting portion 42, thereby increasing the heat dissipation effect.

In addition, when the cylindrical portion 41 and the supporting portion 42 are integrally coupled, the coupling between the cylindrical portion 41 and the supporting portion 42 may be loosened and prevented from being broken.

A power line outlet 43, a fixing hole 44, a fastening hole 45, and a fixing part 46 are formed in the lower portion of the base structure 40, that is, the supporting part 42. The rod 44 to be described later is coupled to the fixing hole 44 and the fixing portion 46. The fastening hole 45 is for coupling with other members such as an external heat sink in a subsequent lamp forming process. The power line outlet 43 is a space for an external power line for applying a voltage to a coil to be described later.

The base structure 40 of the present invention is coupled to the rod 50. The rod 50 may be formed in the form of a circular rod. The rod 50 is formed of a material that can conduct heat well. The rod 50 may be formed of aluminum, brass or copper. The present invention is not limited to this, and can be formed using various materials having good thermal conductivity. The rod 50 consists of a lower end 51, a stop 52, and an upper end 53. The lower end 51 of the rod 50 is coupled to the fixing portion 46 of the base structure 40. To this end, the diameter of the lower end 51 of the rod 50 may be equal to the diameter of the fixing hole 44 or smaller than the diameter of the fixing hole 44. The diameter of the stop portion 52 of the rod 50 may be larger than the diameter of the lower end 51 of the rod 50 and larger than the diameter of the fixing hole 44. Through this, the rod 50 is easily coupled to the fixing part 46.

The base structure 40 may be connected to the magnetic body 60, the sleeve 70, and the coil 80 for use in an electrodeless lamp. The magnetic body 60 is coupled to the rod 50. Magnetic material 60 is a soft magnetic material may be a permanent magnet. To facilitate coupling with the rod 50, the magnetic body 60 may be formed in a hollow cylindrical shape. One end of the rod 50 is inserted into the hollow magnetic body 60 to be coupled. Specifically, the upper end 53 and the magnetic body 60 of the rod 50 is coupled. To this end, the diameter of the upper end 53 of the rod 50 may be less than or equal to the diameter of the inner peripheral surface of the magnetic body (60). In consideration of thermal expansion of the rod 50 during discharge, it is preferable to maintain a gap between the magnetic body 60 and the upper end 53 of the rod 50. The diameter of the stop 52 may be larger than that of the upper end 53 of the rod 50 so that the magnetic body 60 does not flow in the state in which the magnetic body 60 is coupled to the rod 50. In addition, referring to FIG. 3, one more jaw may be formed at the upper end 53.

The heat dissipation space 47 is disposed between the base structure 40 and the rod 50. Convection occurs in this space, which can improve heat dissipation.

The spring 65 is first inserted into the rod 50 before the magnetic body 60 and the rod 50 are coupled. In particular, the spring 65 adjusts its diameter to be arranged at the upper end 53 of the rod 50.

After coupling the spring 65 and the magnetic body 60 to the rod 50, the sleeve 70 is disposed. The sleeve 70 has an outer diameter surrounding the magnetic body 60 and is formed to cover the fixing portion 46 of the base 42 of the base structure 40 from one end of the magnetic body 60. The sleeve 70 can be formed of a synthetic resin material. Sleeve 70 has a fixed disk 71, the closing plate 72, the column portion 73 is formed of an integral structure.

The fixed disk 71 may contact the base 42 of the base structure 40. The fixed disk 71 is formed to be disposed on the inner ring of the cylindrical portion 41 of the base structure 40. The coil 80 is disposed on the outer surface of the pillar portion 73 of the sleeve 70 to be closely wound a predetermined number of times. At this time, the coil 80 is wound so as to correspond to the magnetic material 60. The voltage is applied to the coil 80 from the outside. The power line 82 is connected to one end of the coil 80 to apply a voltage therethrough. The coil 80 is wound around the magnetic body 60 to maintain a predetermined interval. As the number of turns of the coil 80 per unit area increases, the strength of the magnetic field increases, so that the coil 80 is wound as closely as possible. The coil 80 may be formed by coating a conductive wire made of metal. The power line 82 is connected to an external power source through the power line outlet 42 of the base structure 40 described above.

The closing plate 72 of the sleeve 70 supports the rod 50 and the magnetic body 60 at the inner end of the sleeve 70.

4 is a schematic enlarged perspective view illustrating a base structure of an electrodeless lamp according to another embodiment of the present invention. In the present embodiment, description will be made focusing on differences from the above-described embodiment.

The base structure 140 of the electrodeless lamp includes a cylindrical portion 141 and a supporting portion 142. The cylindrical portion 141 and the supporting portion 142 are integrally formed. The cylindrical portion 141 includes a plurality of heat dissipation protrusions 141a and a plurality of heat dissipation grooves 141b. Through this, the outer area of the cylindrical portion 141 increases. As a result, the area in which the cylindrical portion 141 is in contact with the outside air increases, so that the heat dissipation effect of the base structure 140 is improved. 4 illustrates that the heat dissipation protrusion 141a is formed at regular intervals in the vertical direction, but the present invention is not limited thereto. That is, if it can serve as a heat sink, the formation direction and shape of the heat radiation protrusion 141a is not limited.

The cylindrical portion 141 and the support portion 142 may be formed of a thermally conductive member and may be formed of a metal so as to facilitate heat dissipation to the base structure 140. The cylindrical portion 141 and the support portion 142 may be formed to include any one selected from the group consisting of copper, aluminum, stainless, and brass. The cylindrical portion 141 and the support portion 142 may be integrally formed using a casting or pressing method, but may be formed in an integral structure using various other methods.

The lower portion of the base structure 140, that is, the supporting portion 142, has a power line outlet 143, a fixing hole 144, a fastening hole 145, and a fixing portion (not shown). The rod is coupled to the fixing hole 144 and the fixing portion (not shown) as in the above-described embodiment. The fastening hole 145 is for coupling with other members such as an external heat sink when forming a subsequent lamp.

5 is a schematic cross-sectional view showing an electrodeless lamp including the base structure shown in FIG. 1 of the present invention. Although not shown, the structure of FIG. 4 may be applied.

 The electrodeless lamp 1000 includes an envelope 1100, a magnetic body 1060, a coil 1080, a base structure 1040, and a rod 1050. The base structure 1040 includes a cylindrical portion 1041 and a base 1042. The cylindrical portion 1041 and the supporting portion 1042 are formed of a thermally conductive member. A power line outlet (not shown), a fixing hole 1044, a fastening hole 1045, and a fixing part 1046 are formed in the lower portion of the base structure 1040, that is, the support part 1042. The rod 1050 is coupled to the fixing hole 1044 and the fixing portion 1046. The fastening hole 45 is for coupling with other members such as an external heat sink (not shown). The rod 1050 consists of a lower portion 1051, a stop portion 1052, and an upper portion 1053. The lower portion 1051 of the rod 1050 couples to the fixing portion 1046 of the base structure 1040. To this end, the diameter of the lower portion 1051 of the rod 1050 may be equal to the diameter of the fixing hole 1044 or smaller than the diameter of the fixing hole 1044. The diameter of the stop portion 1052 of the rod 1050 may be larger than the diameter of the bottom portion 1051 of the rod 1050. Through this, the rod 1050 is easily coupled to the fixing portion 1046. Hereinafter, descriptions of configurations, materials, and the like of the base structure 1040 and the rod 1050 will be omitted since they are the same as described above.

The rod 1050 is coupled to the magnetic material 1060. Magnetic material 60 is a soft magnetic material may be a permanent magnet. The heat dissipation space 1047 is disposed between the base structure 1040 and the rod 1050. Convection in this space improves heat dissipation.

The spring 1065 is first inserted into the rod 1050 before the magnetic body 1060 and the rod 1050 are coupled. In particular, the spring 1065 adjusts its diameter to be disposed at the upper end 1053 of the rod 1050.

The sleeve 1070 is disposed after coupling the spring 1065 and the magnetic body 1060 to the rod 1050. The sleeve 1070 has an outer diameter surrounding the magnetic body 60 and is formed in a form of covering the fixing portion 1046 of the support portion 1042 of the base structure 1040 from one end of the magnetic body 1060. The sleeve 1070 may be formed of a synthetic resin material. A fixed disk 1071 is formed below the sleeve 1070.

The fixed disk 1071 may contact the support 1042 of the base structure 1040. The fixed disk 1071 is formed to be disposed at the inner ring of the cylindrical portion 1041 of the base structure 1040. The coil 1080 is disposed on the outer surface of the sleeve 70 to be closely wound a predetermined number of times. At this time, the coil 1080 is wound to correspond to the magnetic material 1060. The voltage is applied to the coil 1080 from the outside.

Envelope 1100 includes an ionizable filler including a rare gas and a fluorescent material applied to the inner wall. The envelope 1100 may be formed in a bulb shape in a glass material.

The envelope 1100 is disposed to engage with the interior of the cylindrical portion 1041 of the base structure 1040. Cylindrical portion 1041 is fixed to the side end portion of the envelope 1100 by receiving inward. The cylindrical portion 1041 and the envelope 1100 of the base structure 1040 may be coupled to an inner surface of the cylindrical portion 1041 using an adhesive member. The area in which the envelope 1100 and the cylindrical portion 1041 contact each other may be adjusted such that the magnetic body 1060 is disposed in the internal discharge tube 1105 of the envelope 1100. Envelope 1100 includes a cylindrical inner discharge tube 1105 concavely fused so as to reach an inner central portion from one side of envelope 1100. The internal discharge tube 1105 is formed on the central axis of the envelope 1100. The magnetic body 1060 is disposed to correspond to the internal discharge tube 1105. Exhaust ports 1110 may be formed at both sides of the lower end of the envelope 1100. The exhaust port 1110 contains a small amount of mercury. Mercury can emit ultraviolet light when discharged. When rare gases such as argon and krypton, etc., present inside the envelope 1100 are mixed with mercury, ultraviolet rays emitted from mercury are discharged from mercury during discharge due to an induced magnetic field, and visible light is emitted through the phosphor coated on the inner surface of the envelope 1100. Will be released.

In the electrodeless lamp 1000 according to the present embodiment, the cylindrical portion 1041 and the supporting portion 1042 are formed of a thermally conductive member, so that the heat generated from the electrodeless lamp 1000 during discharge is the cylindrical portion 1041 and the supporting portion 1042. Easily discharged through) increases the heat dissipation effect. As a result, the magnetic body 1060 having a large influence on the discharge characteristics of the electrodeless lamp 1000 may be easily maintained at or below the Curie point temperature. As a result, the luminance characteristic of the electrodeless lamp 1000 is improved.

In addition, since the cylindrical portion 1041 is formed integrally with the supporting portion 1042, the coupling between the cylindrical portion 1041 and the supporting portion 1042 can be prevented from being loosened and broken.

Operation of the electrodeless lamp 1000 according to an embodiment of the present invention is as follows. When power is applied to the coil 1080 from an external power source such as an inverter, an induced magnetic field corresponding thereto is generated around the coil 1080. The induced magnetic field discharges the ultraviolet rays by discharging an ionizable filler including the rare gas filled in the envelope 1100. Ultraviolet rays impinge on the fluorescent material applied to the inner wall of the envelope 1100 so that visible light is emitted outside the envelope 1100. In this case, the base structure 1040 supporting the envelope 1100 is integrally formed so that the cylindrical portion 1040 and the support portion 1041 are firmly coupled, and the base structure 1040 is integrally formed with good thermal conductivity. In this case, the heat dissipation effect to the base structure 1040 may be improved during plasma discharge, thereby improving luminance characteristics of the electrodeless lamp 1000.

6 is a schematic cross-sectional view showing an electrodeless lamp according to still another embodiment of the present invention.

The electrodeless lamp 2000 includes a magnetic body 2060, a coil 2080, an envelope 2100, and a base structure 2040. The electrodeless lamp shown in FIG. 6 differs from the above-described embodiment in that it does not include a sleeve.

The magnetic body 2060 may be a permanent magnet. Specifically, it may be formed using a nickel-zinc (Ni-Zn) -based ferrite. The magnetic body 2060 may be formed in a cylindrical shape having a hollow portion therein. In this case, the outer circumferential surface of the magnetic body 2060 may be smoothly formed.

A coil 2080 is disposed on an outer circumferential surface of the magnetic body 2060 to wind the magnetic body 2060. The voltage is applied to the coil 2080 from the outside. The present invention has a structure in which the coil 2080 is wound around the outer circumferential surface of the magnetic body 2060. Therefore, no sleeve is interposed between the coil 2080 and the magnetic body 2060. In the present embodiment, since the magnetic body 2060 and the coil 2080 are wound closer than when the other member such as the sleeve is interposed, the intensity of the induced magnetic field is increased. In addition, the magnetic body 2060 of the present embodiment includes an outer circumferential surface of the smooth surface and the coil 2080 is wound around the smooth outer circumferential surface of the magnetic body 2060 so that an induction magnetic field is uniformly formed. When the induced magnetic field is uniform, the discharge characteristics of the electrodeless lamp are uniform, and uniform light can be extracted.

The magnetic body 2060 is coupled to the rod 2050. The rod 2050 is formed of a material that can conduct heat well. The rod 2050 may be formed of aluminum, copper, and brass. The present invention is not limited to this, and can be formed using various materials having good thermal conductivity. In order to facilitate coupling of the rod 2050 and the magnetic body 2060, one end of the columnar rod 2050 may be inserted into the hollow cylindrical magnetic body 2060. The rod 2050 includes an upper portion 2053, a stop portion 2052, and a lower portion 2051. The magnetic body 2060 is coupled to the upper end 2053 of the rod 2050. To this end, the diameter of the inner circumferential surface of the magnetic body 2060 may be greater than or equal to the diameter of the upper end portion 2053 of the rod 2050. The diameter of the stop portion 2052 of the rod 2050 is larger than the diameter of the inner circumferential surface than the diameter of the magnetic body 2060. As a result, as shown in FIG. 6, the magnetic body 2060 may be coupled to the upper end 2053 of the rod 2050 and does not flow down to the stop portion 2052 of the rod 2050.

The lower end 2051 of the rod 2050 couples to the fixing portion 2046 of the base structure 2040. To this end, the diameter of the lower portion 2051 of the rod 2050 may be equal to the diameter of the fixing hole 2044 or smaller than the diameter of the fixing hole 2044. The diameter of the stop portion 2052 of the rod 2050 may be larger than the diameter of the bottom portion 2051 of the rod 2050. Through this, the rod 2050 is easily coupled to the fixing portion 2046.

The envelope 2100 is disposed to engage with the interior of the cylindrical portion 2041 of the base structure 2040.

Envelope 2100 includes an ionizable filler containing a rare gas and a fluorescent material applied to the inner wall. The envelope 2100 may be formed in a bulb shape in a glass material.

Cylindrical portion 2041 is to receive the side end portion of the envelope 2100 to the inside to fix and finish. The cylindrical portion 2041 and the envelope 2100 of the base structure 2040 may be coupled to an inner surface of the cylindrical portion 2041 using an adhesive member. The area between the envelope 2100 and the cylindrical portion 2041 may be adjusted such that the magnetic body 2060 is disposed in the inner discharge tube 2105 of the envelope 2100. The envelope 2100 includes a cylindrical inner discharge tube 2105 that is concavely fused so as to reach an inner center portion from one side of the lower portion of the envelope 2100. The internal discharge tube 2105 is formed on the central axis of the envelope 2100. The magnetic body 2060 is disposed to correspond to the internal discharge tube 2105. Exhaust ports 2110 may be formed at both sides of the lower end of the envelope 2100. The exhaust port 2110 contains a small amount of mercury. Mercury can emit ultraviolet light when discharged. When rare gases such as argon and krypton, etc., present in the envelope 2100 are mixed with mercury, ultraviolet rays emitted from mercury during the discharge due to an induced magnetic field are visible through a phosphor coated on the inner surface of the envelope 2100. Will release the room.

The electrodeless lamp according to the present invention can improve heat dissipation efficiency and improve durability.

Although described with reference to the embodiment shown in the drawings it is merely exemplary, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (6)

An envelope coated with a fluorescent material on an inner wall, filled with a discharge gas, and provided with a discharge tube at an inner center thereof; A base structure having a cylindrical portion closely attached to a side end portion of the envelope, and a support portion connected to the cylindrical portion on one side of the cylindrical portion; A rod coupled to the support part and disposed on an inner central axis of the discharge tube; A magnetic material formed on an outer surface of the rod to be located inside the discharge tube; And A coil disposed to be wound outside the magnetic material, The base structure is made of a thermally conductive member made of the same material as the cylindrical portion and the support portion are formed in an integral structure, The base of the base structure is an electrodeless lamp having a power line outlet. delete According to claim 1, The cylindrical portion and the support portion is an electrodeless lamp formed of a material containing a metal. According to claim 1, And the cylindrical portion and the supporting portion include any one selected from the group consisting of copper, aluminum, stainless steel, and brass. According to claim 1, An electrodeless lamp having a plurality of heat dissipation protrusions formed on an outer circumferential surface of the cylindrical portion. According to claim 1, The electrodeless lamp further comprises a sleeve surrounding the rod.

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