JP4946552B2 - External electrode type rare gas fluorescent lamp - Google Patents

Description

  The present invention relates to a rare gas fluorescent lamp for backlights of liquid crystals and advertisements / signboards, and more particularly to an external electrode type rare gas fluorescent lamp in which an electrode is provided on the outer peripheral surface of an arc tube.

  As an original reading light source, there was an external electrode type rare gas fluorescent lamp described in Patent Document 1. As will be described later with reference to FIG. 11, an external electrode type rare gas fluorescent lamp as a light source for reading a document has a rare gas and a phosphor enclosed in an arc tube, and a pair of external electrodes on the outer surface of the arc tube. It is arranged along the axial direction. Further, as a document reading light source, a heat shrinkable tube is provided so as to cover the entire external electrode. In the external electrode type rare gas fluorescent lamp, a rare gas is excited by the occurrence of discharge between the external electrodes during lamp operation, and the phosphor is excited by the excitation light of the rare gas. When this external electrode type rare gas fluorescent lamp as a document reading light source is used as a backlight light source, there is a problem in that the heat shrinkable tube covering the external electrode is heated and colored by discharge. There was a problem. This is because the original reading light source is required to turn on the lamp for 1000 hours, whereas the backlight light source is required to use the lamp for tens of thousands of hours for a long time. The problem of decline began to occur.

  For this reason, an external electrode type rare gas fluorescent lamp 9 as shown in FIG. 11 has been devised. An external electrode type rare gas fluorescent lamp that prevents a decrease in illuminance due to coloring of the heat shrinkable tube will be described with reference to FIG. FIG. 11A is a perspective view of a conventional external electrode type rare gas fluorescent lamp 9, and FIG. 11B is a view perpendicular to the tube axis direction of the conventional external electrode type rare gas fluorescent lamp 9 of FIG. It is sectional drawing (GG sectional drawing of (a)). FIG. 11C is a cross-sectional view (HH cross-sectional view of FIG. 11A) perpendicular to the tube axis direction of the conventional external electrode type rare gas fluorescent lamp 9 of FIG.

A conventional external electrode type rare gas fluorescent lamp 9 shown in FIG. 11 includes a tubular arc tube 91, a phosphor 92, an external electrode 93, a power supply terminal 95, and a heat shrinkable tube 96.
As shown in FIG. 11 (b), a phosphor 92 is applied to the inner peripheral surface of the tubular arc tube 91. The arc tube 91 is filled with a rare gas such as xenon gas as the luminescent gas, and both ends of the arc tube 91 in the tube axis direction are sealed.
The pair of external electrodes 93 are arranged so as to be separated from each other along the longitudinal direction of the outer peripheral surface of the arc tube 91. As for the external electrode 93 arrange | positioned at the outer peripheral surface of the arc_tube | light_emitting_tube 91, the electric power feeding terminal 95 is electrically connected to the edge part of the longitudinal direction using a conductive adhesive (patent document 1).
In order to maintain the connection between the external electrode 93 and the power supply terminal 95, the conductive adhesive alone is insufficient. Therefore, at the end of the arc tube 91 in the tube axis direction, the ring-shaped heat shrinkable tube 96 covers the outside of the feed terminal 95 at the surface where the external electrode 93 and the feed terminal 95 are in contact, and the outer peripheral surface of the arc tube 91. Cover the entire circumference in the circumferential direction. Thereby, the connectivity between the external electrode 93 and the power supply terminal 95 can be improved.
A power supply (not shown) is connected to the power supply terminal 95 disposed at the longitudinal end of the external electrode 93.
The conventional external electrode type rare gas fluorescent lamp 9 as described above is supplied with power from a power source (not shown), and due to the potential difference between the external electrodes 93, vacuum ultraviolet rays are emitted by the xenon gas, which is a luminescent gas, The phosphor 92 is excited. The arc tube 91 between the external electrodes 93 functions as a dielectric.

Japanese Patent Laid-Open No. 03-269950

  When the conventional external electrode type rare gas fluorescent lamp 9 is used indoors as a liquid crystal backlight, when the room is heated in an environment such as a cold region, the external electrode type rare gas fluorescent lamp disposed in the room due to the difference in temperature and temperature. Condensation sometimes occurred on the surface of 9. Water droplets generated by this condensation may collect at the interface 97 of the heat-shrinkable tube 96 and continuously accumulate at the interface 97 of the heat-shrinkable tube 96. Since the heat shrinkable tube 96 covers the external electrode 93 and the power supply terminal 95 and covers the outer peripheral surface of the arc tube 91 in the circumferential direction, it continues to the interface 97 of the heat shrinkable tube 96 so as to connect the pair of external electrodes 93. Water drops will accumulate. For this reason, there is a problem that creeping discharge in which electricity flows through water droplets continuously connecting the external electrodes 93 due to power feeding to the external electrodes 93 when the lamps 9 are lit, and the lamps 9 are not lit. Further, when the heat shrinkable tube 96 is made of an organic material, it has a problem that it is carbonized by creeping discharge and sometimes ignites. Such problems of the external electrode type rare gas fluorescent lamp 9 are not limited to indoors, but moisture adheres to the outer peripheral surface of the arc tube 91 of the external electrode type rare gas fluorescent lamp 9 as in the case where it is exposed to rain outdoors. What happens in the environment.

  Accordingly, an object of the present invention is to provide an external electrode type rare gas fluorescent lamp which improves the connectivity between an external electrode and a power supply terminal and prevents creeping discharge.

An external electrode type rare gas fluorescent lamp according to a first aspect of the present invention is an arc tube in which a rare gas is enclosed and a phosphor is provided on the inner surface thereof, and one of the outer tube provided in the tube axis direction of the arc tube on the outer surface of the arc tube. An external electrode; one feeding terminal electrically connected to the one external electrode at an end of the arc tube; and the arc tube at a position away from the one external electrode in the circumferential direction of the arc tube. and the other external electrode provided in the axial direction of the tube, and the other power supply terminal electrically connected to the other external electrode at the end of the arc tube, the external electrode type rare gas fluorescent lamp made of the A first adhesive body having electrical insulation is provided so as to cover the one power supply terminal and the one external electrode at the end of the arc tube, and the other power supply terminal at the end of the arc tube Cover the other external electrode A second adhesive body having electrical insulation is provided, and the first adhesive body and the second adhesive body are separated from each other on the outer surface of the arc tube.

An external electrode type rare gas fluorescent lamp according to a second aspect of the present invention is an arc tube in which a rare gas is sealed and a phosphor is provided on the inner surface, and one of the outer tube and the outer surface of the arc tube provided in the direction of the tube axis of the arc tube. An external electrode; one feeding terminal electrically connected to the one external electrode at an end of the arc tube; and the arc tube at a position away from the one external electrode in the circumferential direction of the arc tube. and the other external electrode provided in the axial direction of the tube, and the other power supply terminal electrically connected to the other external electrode at the end of the arc tube, the external electrode type rare gas fluorescent lamp made of the A first covering body is provided so as to cover the one feeding terminal at an end of the arc tube, and a first adhesive body having electrical insulation is provided in a gap between the first covering body and the arc tube. It is provided, the other at the end of the arc tube A second cover is provided so as to cover the power supply terminal, and a second adhesive having electrical insulation is provided in a gap between the second cover and the arc tube, and the first cover is provided. The body and the second covering body, and the first adhesive body and the second adhesive body are separated from each other on the outer surface of the arc tube.

  In the external electrode type rare gas fluorescent lamp according to the present invention, the first cover is extended in the tube axis direction beyond the end surface of the tube in the tube axis direction, and the second cover is formed in the tube. A second connection body is provided that extends in the tube axis direction beyond the end surface in the tube axis direction and connects the extended first covering body and the second covering body. It is an external electrode type rare gas fluorescent lamp described in the invention.

  The external electrode type rare gas fluorescent lamp according to the present invention is characterized in that a pressing body is provided so as to press the first covering body or the second covering body so as not to continue on the outer surface of the arc tube. An external electrode type rare gas fluorescent lamp according to the second invention.

  An external electrode type rare gas fluorescent lamp according to a first aspect of the present invention includes an arc tube in which a rare gas is sealed and a fluorescent material is provided on the inner surface, and one of the outer surfaces of the arc tube provided in the tube axis direction of the arc tube. An external electrode, one power supply terminal electrically connected to the one external electrode, and a tube axis direction of the arc tube at a position away from the one external electrode in the circumferential direction of the arc tube In an external electrode type rare gas fluorescent lamp comprising the other external electrode and the other power supply terminal electrically connected to the other external electrode, the other power supply terminal crosses the arc tube from the one power supply terminal and the other power supply terminal. A first adhesive body having electrical insulation is provided so as not to be continuous with the external electrode, and extends from the other feeding terminal to the arc tube and is not continuous with the one external electrode and the first adhesive body. Second having electrical insulation By providing the attachment body, one power supply terminal and the arc tube are bonded by the first adhesive body, and the other power supply terminal and the arc tube are bonded by the second adhesive body. The connectivity between the power supply terminal and the external electrode between the arc tube and the arc tube can be improved. Further, since the first adhesive body was not continuous with the other external electrode and the second adhesive body was not continuous with the one external electrode and the first adhesive body, moisture adhered to the outer peripheral surface of the arc tube. Even so, it is possible to prevent moisture from being continuously connected between the external electrodes. For this reason, the external electrode type rare gas fluorescent lamp according to the present invention can prevent the occurrence of creeping discharge between the external electrodes in an environment where moisture adheres to the outer peripheral surface of the arc tube.

  An external electrode type rare gas fluorescent lamp according to a second aspect of the present invention is an arc tube in which a rare gas is sealed and a phosphor is provided on the inner surface, and one of the outer tube and the outer surface of the arc tube provided in the direction of the tube axis of the arc tube. An external electrode, one power supply terminal electrically connected to the one external electrode, and a tube axis direction of the arc tube at a position away from the one external electrode in the circumferential direction of the arc tube In an external electrode type rare gas fluorescent lamp comprising the other external electrode and the other power supply terminal electrically connected to the other external electrode, it covers the one power supply terminal and is not continuous with the other external electrode. A first covering body is provided, and a first adhesive body having electrical insulation is provided in a gap between the first covering body and the arc tube so as not to be continuous with the other external electrode, One of the external electrodes covering the other feeding terminal and The second covering body is provided so as not to be continuous with the first adhesive body, and the second adhesive body having electrical insulation in the gap between the second covering body and the arc tube is the one external electrode. And the first covering body so as not to be continuous with the first covering body, the first covering body covers one feeding terminal and the second covering body serves as the other feeding terminal. Since it is covered, the mechanical strength outside the power supply terminal on the surface where the external electrode and the power supply terminal are in contact can be improved. Further, since the first adhesive body is provided in the gap between the first covering body and the arc tube and the second adhesive body is provided in the gap between the second covering body and the arc tube, The connectivity between the power supply terminal between the arc tube and the external electrode can be improved. In addition, the first cover is not continuous with the other external electrode, the first adhesive is not continuous with the other external electrode, and the second cover is one of the external electrode and the first adhesive. Since the second adhesive body was not continuous with one of the external electrodes, the first adhesive body, and the first covering body, even if moisture adheres to the outer peripheral surface of the arc tube, the gap between the external electrodes is not continuous. It is possible to prevent moisture from being continuously tied. For this reason, the external electrode type rare gas fluorescent lamp according to the present invention can prevent the occurrence of creeping discharge between the external electrodes in an environment where moisture adheres to the outer peripheral surface of the arc tube.

  In the external electrode type rare gas fluorescent lamp according to the present invention, the first cover is extended in the tube axis direction beyond the end surface of the tube in the tube axis direction, and the second cover is formed in the tube. By providing a connection body that extends in the tube axis direction beyond the end surface in the tube axis direction and connects the extended first covering body and the second covering body, the first covering body is provided. Alternatively, even when a load is applied to the second covering body, the load is dispersed by the connecting body, so that the mechanical strength of the connected external electrode and the power feeding terminal can be improved. Furthermore, it is possible to prevent water from being continuously accumulated between the connection body and the arc tube. For this reason, the external electrode type rare gas fluorescent lamp according to the present invention can prevent the occurrence of creeping discharge between the external electrodes in an environment where moisture adheres to the outer peripheral surface of the arc tube.

  In the external electrode type rare gas fluorescent lamp according to the present invention, the pressing body is provided so as to press the first covering body or the second covering body so as not to continue on the outer surface of the arc tube. Presses the first covering body or the second covering body, so that the fixing of the covering body to the power feeding terminal by the bonding function of the adhesive body can be supplemented, and the fixing of the covering body to the power feeding terminal can be strengthened. Furthermore, by providing the pressing body so as not to be continuous on the outer surface of the arc tube, it is possible to prevent moisture from being continuously accumulated between the arc tube and the pressing body. For this reason, the external electrode type rare gas fluorescent lamp according to the present invention can prevent the occurrence of creeping discharge between the external electrodes in an environment where moisture adheres to the outer peripheral surface of the arc tube.

  A first embodiment of an external electrode type rare gas fluorescent lamp 1 according to the present invention will be described with reference to FIGS.

  FIG. 1 is an explanatory view of an external electrode type rare gas fluorescent lamp 1 according to the present invention. FIG. 1A is a perspective view of the external electrode type rare gas fluorescent lamp 1, and FIG. 1B is a cross-sectional view perpendicular to the tube axis direction of the external electrode type rare gas fluorescent lamp 1 of FIG. It is AA sectional drawing of a). FIG. 1 (c) is a diagram for explaining the adhesive bodies 51 and 52 that connect the external electrodes 41 and 42 and the power supply terminals 43 and 44 with respect to the tube axis direction of the external electrode type rare gas fluorescent lamp 1. It is sectional drawing (BB sectional drawing of (a)) of a perpendicular direction.

  As shown in FIG. 1B, the phosphor 3 is applied to the inner peripheral surface of the tubular arc tube 2. That is, in the phosphor 3, a layer of the phosphor 3 is formed over the entire axial length of the inner surface of the arc tube 2. The inside 21 of the arc tube 2 is filled with, for example, a rare gas mainly composed of xenon gas as a luminescent gas, and both ends of the arc tube 2 are sealed.

On the outer peripheral surface of the arc tube 2, a pair of external electrodes 41, 42 are disposed so as to be separated in the longitudinal direction of the outer surface of the arc tube 2. That is, the pair of external electrodes 41 and 42 are provided in the tube axis direction of the arc tube at positions separated in the circumferential direction of the arc tube 2.
The external electrodes 41 and 42 are formed in a film shape by, for example, applying a paste in which silver and frit glass are mixed to a desired position on the outer peripheral surface of the arc tube 2 and baking it in the atmosphere of 400 ° C. or higher.

Plate-shaped power supply terminals 43 and 44 are arranged at the longitudinal ends of the pair of external electrodes 41 and 42 so that the external electrodes 41 and 42 are sandwiched between the arc tube 2. One external electrode 41 and one power supply terminal 43 connected thereto are outside the power supply terminal 43 on the surface where the external electrode 41 and the power supply terminal 43 are in contact (outward in the radial direction of the arc tube 2). The first adhesive 51 is covered. Similarly, the other external electrode 42 and the other power supply terminal 44 connected to the external electrode 42 are located outside the power supply terminal 44 on the surface where the external electrode 42 and the power supply terminal 44 are in contact (outside of the radial direction of the arc tube 2). 1), it is covered by the second adhesive body 52. As described above, the external electrodes 41 and 42 and the power supply terminals 43 and 44 are covered with the first adhesive body 51 and the second adhesive body 52, so that the external electrodes 41 and 42 and the power supply terminals 43 and 44 are connected. It can be held on the outer surface of the arc tube 2, and the connectivity between the external electrodes 41 and 42 and the power supply terminals 43 and 44 is improved by the adhesiveness of the first adhesive body 51 and the second adhesive body 52. Can do.
The pair of adhesive bodies 51 and 52 also covers the outer surface of the arc tube 2, but the first adhesive body 51 and the second adhesive body 52 are separated from each other. That is, since the adhesive bodies 51 and 52 are not continuously provided in the circumferential direction of the outer surface of the arc tube 2, the moisture on the outer surface of the arc tube 2 is circumferential in the environment where moisture adheres to the outer circumferential surface of the arc tube 2. It is possible to prevent continuous tying.

  As shown in FIG. 1A, the power supply terminals 43 and 44 protrude in the tube axis direction from the outer surface of the end portion of the arc tube 2 in the tube axis direction. Feed lines 45 and 46 are electrically connected to the inside of the protruding portions of the feed terminals 43 and 44. A connector 47 is connected to the ends of the power supply lines 45 and 46, and the connector 47 is connected to a power supply device (not shown).

  FIG. 2 is an explanatory diagram of a structure for connecting the external electrode 41 and the power supply terminal 43, and is an enlarged view of one external electrode 41 in FIG. The same reference numerals are given to the same components as those shown in FIG.

  The power supply terminal 43 is, for example, a plate-like phosphor bronze surface plated with nickel, and is disposed outside the external electrodes 41 and 42 (outward in the radial direction of the arc tube 2) as described above. A conductive joined body 48 is provided between the external electrode 41 and the power supply terminal 43 to electrically connect them. Examples of the conductive bonded body 48 include a solder 48 containing Bi-Sn as a main component, and a solder 48 to which silver (Ag), copper (Cu), aluminum (Al) or the like is added as required is used. it can. The conductive bonded body 48 is not limited to the solder 48, and a conductive adhesive 48 in which a metal such as silver (Ag) is mixed with a resin material such as an epoxy resin can also be used.

  As shown in FIG. 2, in the cross section perpendicular to the tube axis direction of the arc tube 2, the external electrode 41 and the power supply terminal 43 that are electrically connected by the conductive joined body 48 are bonded with an adhesive function. Covered by the body 51. Furthermore, the adhesive 51 covers a part of the outer peripheral surface of the arc tube 2 and adheres, whereby the adhesion between the external electrode 41 and the power supply terminal 43 on the outer surface of the arc tube 2 can be improved.

  For the adhesive bodies 51 and 52, for example, an adhesive resin mainly composed of an epoxy resin, a phenol resin, or a silicone resin can be used as a resin having an adhesive function, and a phosphoric acid based adhesive is used as a ceramic adhesive. An agent or the like can be used. Such a resin or adhesive has electrical insulation. By using these as the adhesive bodies 51 and 52, it is possible to improve electrical insulation outside the power supply terminals 43 and 44 on the surface where the external electrodes 41 and 42 and the power supply terminals 43 and 44 are in contact with each other.

  In the external electrode type rare gas fluorescent lamp 1 described above, when the lamp 1 is turned on, power is supplied to the power supply terminals 43 and 44 from a power supply device (not shown), and a pair of spaced apart external electrodes 41 and 42 electrically connected thereto are connected. Power is supplied. Since the adhesive bodies 51 and 52 covering the power supply terminals 43 and 44 and the external electrodes 41 and 42 are separated in the circumferential direction of the outer surface of the arc tube 2, moisture due to condensation or the like is generated on the outer surface of the arc tube 2. However, moisture does not continuously connect between the pair of external electrodes 41 and 42. That is, since the adhesive bodies 51 and 52 are not continuously provided in the circumferential direction of the outer surface of the arc tube 2, creeping discharge due to moisture on the outer surface of the arc tube 2 can be prevented.

  An external electrode type rare gas fluorescent lamp 1 according to the present invention is provided in a tube axis direction of the arc tube 2 on the outer surface of the arc tube 2 and an arc tube 2 in which a rare gas is sealed and a phosphor 3 is provided on the inner surface. One external electrode 41, one power supply terminal 43 electrically connected to the one external electrode 41, and the arc tube at a position away from the one external electrode 41 in the circumferential direction of the arc tube 2. In the external electrode type rare gas fluorescent lamp 1, which includes the other external electrode 42 provided in the direction of the tube axis 2 and the other power supply terminal 44 electrically connected to the other external electrode 42. A first adhesive body 51 having electrical insulation is provided so as not to be continuous with the other external electrode 42 from the power supply terminal 43 to the arc tube 2, and from the other power supply terminal 44 to the arc tube 2. And the one external electrode 4 In addition, since the second adhesive body 52 having electrical insulation is provided so as not to be continuous with the first adhesive body 51, one power supply terminal 43 and the arc tube 2 are bonded by the first adhesive body 51. Since the other power supply terminal 44 and the arc tube 2 are bonded together by the second adhesive body 52, the power supply terminals 43 and 44 and the external electrode 41 between the adhesive bodies 51 and 52 and the arc tube 2 are connected. Connectivity with 42 can be improved. Furthermore, since the first adhesive body 51 was not continuous with the other external electrode 42 and the second adhesive body 52 was not continuous with the one external electrode 41 and the first adhesive body 51, Even if moisture adheres to the outer peripheral surface, it is possible to prevent moisture from being continuously connected between the external electrodes 41 and 42. Therefore, the external electrode type rare gas fluorescent lamp 1 according to the present invention can prevent the occurrence of creeping discharge between the external electrodes 41 and 42 in an environment where moisture adheres to the outer peripheral surface of the arc tube 2.

  Another embodiment of the first embodiment of the external electrode type rare gas fluorescent lamp 1 according to the present invention will be described with reference to FIG.

FIG. 3 is an explanatory view of the external electrode type rare gas fluorescent lamp 1 according to the present invention. FIG. 3A is a perspective view of one end of the external electrode type rare gas fluorescent lamp 1 where the power supply terminals 43 and 44 are disposed. 3B is a cross-sectional view perpendicular to the tube axis direction of the external electrode type rare gas fluorescent lamp 1 in FIG. 3A (a cross-sectional view taken along the line CC in FIG. 3A). FIG. 3, the same components as those shown in FIG. 1 are denoted by the same reference numerals.
FIG. 3 is different from FIG. 2 in that the feeding terminal 43 is wider than the external electrode 41 in the circumferential direction of the arc tube 2 and a gap is formed between the arc tube 2 and the feeding terminal 43. As an explanation of FIG. 3, differences from FIG. 2 will be described.

In the circumferential direction of the arc tube 2, as shown in FIG. 3B, the power supply terminal 43 wider than the external electrode 41 is disposed outside the external electrode 41 (outside in the radial direction of the arc tube 2). . For this reason, a gap is formed between the power supply terminal 43 and the arc tube 2. Outside the power supply terminal 43 (outward in the radial direction of the arc tube 2), the power supply terminal 43 is covered with the first adhesive 51. At this time, as shown in FIG. 3B, the first adhesive 51 crosses from the power supply terminal 43 to the arc tube 2 while the gap formed between the power supply terminal 43 and the arc tube 2 remains. May be provided. Even if a gap remains between the power supply terminal 43 and the arc tube 2, the power supply terminal 43 can be held outside the arc tube 2 by being provided from the power supply terminal 43 to the arc tube 2. The external electrode 41 sandwiched between the power supply terminal 43 and the arc tube 2 can also be held on the outer surface of the arc tube 2.
The external electrode type rare gas fluorescent lamp 1 according to the present embodiment has the external electrode type described in the first embodiment even if a gap is formed between the power supply terminal 43, the arc tube 2, and the first adhesive body 51. The same effect as the rare gas fluorescent lamp 1 can be obtained.

  Another embodiment of the first embodiment of the external electrode type rare gas fluorescent lamp 1 according to the present invention will be described with reference to FIG.

FIG. 4 is an explanatory view of the external electrode type rare gas fluorescent lamp 1 according to the present invention, and is a perspective view of the external electrode type rare gas fluorescent lamp 1. 4, the same components as those shown in FIG. 1 are denoted by the same reference numerals.
4 is different from FIG. 1 in the positions where the power supply terminals 43 and 44 are arranged. As an explanation of FIG. 4, differences from FIG. 1 will be described.

Of the pair of external electrodes 41, 42, one power supply terminal 43 is disposed at one end in the longitudinal direction of one external electrode 41, and the other power supply is disposed at the other end in the longitudinal direction of the other external electrode 42. A terminal 44 is disposed. That is, one feeding terminal 43 is disposed at one end in the longitudinal direction of the arc tube 2 and the other feeding terminal 44 is disposed at the other end. They are spaced apart in the longitudinal direction.
One external electrode 41 and one power supply terminal 43 connected thereto are outside of one power supply terminal 43 on the surface where the one external electrode 41 and one power supply terminal 43 are in contact (the diameter of the arc tube 2). In the direction outward), it is covered by the first adhesive body 51. Similarly, the other external electrode 42 and the other power supply terminal 44 connected thereto are located outside the other power supply terminal 44 (the arc tube) on the surface where the other external electrode 42 and the other power supply terminal 44 are in contact. 2 in the outer radial direction), it is covered by the second adhesive body 52. As described above, the external electrodes 41 and 42 and the power supply terminals 43 and 44 are covered with the first adhesive body 51 and the second adhesive body 52, so that the external electrodes 41 and 42 and the power supply terminals 43 and 44 are connected. It can be held on the outer surface of the arc tube 2, and the connectivity between the external electrodes 41 and 42 and the power supply terminals 43 and 44 is improved by the adhesiveness of the first adhesive body 51 and the second adhesive body 52. Can do.
The pair of adhesive bodies 51 and 52 also covers the outer surface of the arc tube 2, but the first adhesive body 51 and the second adhesive body 52 are separated in the longitudinal direction of the arc tube 2. Furthermore, the first adhesive 51 provided outside the one power supply terminal 43 on the surface where the one external electrode 41 and the one power supply terminal 43 are in contact (outward in the radial direction of the arc tube 2) The external electrode 42 is not continuously provided. Further, the second adhesive body 52 provided outside the other power supply terminal 44 on the surface where the other external electrode 42 and the other power supply terminal 44 are in contact (outward in the radial direction of the arc tube 2) The external electrode 41 is not continuously provided. That is, since the adhesive bodies 51 and 52 are not continuously provided between the pair of external electrodes 41 and 42, the moisture on the outer surface of the arc tube 2 is circumferential in the environment where moisture adheres to the outer peripheral surface of the arc tube 2. Can be prevented from being tied continuously.

In the external electrode type rare gas fluorescent lamp 1 described above, when the lamp 1 is turned on, power is supplied to the power supply terminals 43 and 44 from a power supply device (not shown), and a pair of spaced apart external electrodes 41 and 42 electrically connected thereto are connected. Power is supplied. The adhesive bodies 51 and 52 covering the power supply terminals 43 and 44 and the external electrodes 41 and 42 are spaced apart in the longitudinal direction of the arc tube 2 and are not continuously provided between the pair of external electrodes 41 and 42. For this reason, even if moisture due to condensation or the like is generated on the outer surface of the arc tube 2, the moisture is not continuously connected between the pair of external electrodes 41 and 42. That is, one adhesive body 51 and the other adhesive body 52 are separated in the longitudinal direction of the outer surface of the arc tube 2 and are not continuously provided in the circumferential direction connecting the pair of external electrodes 41, 42. Further, creeping discharge due to moisture on the outer surface of the arc tube 2 can be prevented.
The external electrode type rare gas fluorescent lamp 1 according to the present embodiment can obtain the same effects as the external electrode type rare gas fluorescent lamp 1 described in the first embodiment.

  A second embodiment of the external electrode type rare gas fluorescent lamp 1 according to the present invention will be described with reference to FIG.

FIG. 5 is an explanatory diagram of the external electrode type rare gas fluorescent lamp 1 according to the present invention. FIG. 5A is a perspective view of one end portion where the power supply terminals 43 and 44 of the external electrode type rare gas fluorescent lamp 1 are arranged. FIG. 5B is a cross-sectional view (DD cross-sectional view of FIG. 5A) perpendicular to the tube axis direction of the external electrode type rare gas fluorescent lamp 1 of FIG. FIG. 5, the same components as those shown in FIG. 1 are denoted by the same reference numerals.
FIG. 5 differs from FIG. 1 in that the coverings 61 and 62 are used. As an explanation of FIG. 5, differences from FIG. 1 will be described.

Plate-shaped power supply terminals 43 and 44 are arranged at the longitudinal ends of the pair of external electrodes 41 and 42 so that the external electrodes 41 and 42 are sandwiched between the arc tube 2. One external electrode 41 and one power supply terminal 43 connected thereto are outside of one power supply terminal 43 on the surface where the one external electrode 41 and one power supply terminal 43 are in contact (the diameter of the arc tube 2). In the direction outward), it is covered by the first covering body 61. Similarly, the other external electrode 42 and the other power supply terminal 44 connected thereto are located outside the other power supply terminal 44 (the arc tube) on the surface where the other external electrode 42 and the other power supply terminal 44 are in contact. 2 in the outer radial direction), it is covered by the second covering body 62.
The pair of covering bodies 61 and 62 also covers the outer surface of the arc tube 2, but the first covering body 61 and the second covering body 62 are separated from each other on the outer surface of the arc tube 2. That is, the coverings 61 and 62 are not continuously provided in the circumferential direction of the outer peripheral surface of the arc tube 2.

As shown in FIG. 5B, a pair of external electrodes 41 (42 is not shown in FIG. 5B) provided on the outer surface of the arc tube 2 (outside in the radial direction of the arc tube 2). Is provided with a conductive joined body 48 that electrically connects the power supply terminal 43 and the external electrode 41.
In a cross section perpendicular to the tube axis direction of the arc tube 2 (FIG. 5B), the external electrode 41, the conductive joint 48, and the feed terminal 43 stacked on the outer peripheral surface of the arc tube 2 are covered. A covering 61 having a substantially U-shaped cross section is disposed. That is, the concave portion forming a substantially U shape in the cross section of the covering 61 is arranged to engage with the external electrode 41, the conductive joint 48 and the power supply terminal 43.

  When the covering 61 is arranged so as to cover the external electrode 41, the conductive joint 48, and the power supply terminal 43, a gap is formed between the arc tube 2 and the covering 61 as shown in FIG. By filling the gap 51 with an adhesive 51 having an adhesive function, the covering 61 can be fixed in a state where the external electrode 41 and the power supply terminal 43 are covered. Further, the connectivity between the external electrode 41 and the power supply terminal 43 can be improved by the bonding function of the bonding body 51.

  As shown in FIG. 5A, one external electrode 41 and one power supply terminal 43 connected to the external electrode 41 are located outside the power supply terminal 43 on the surface where the external electrode 41 and the power supply terminal 43 are in contact (light emission). On the outer side of the tube 2 in the radial direction), the first adhesive body 51 is filled in a gap formed by the first cover body 61 and formed between the first cover body 61 and the arc tube 2. . Similarly, the other external electrode 42 and the other power supply terminal 44 connected to the external electrode 42 are located outside the power supply terminal 44 on the surface where the external electrode 42 and the power supply terminal 44 are in contact (outside of the radial direction of the arc tube 2). 1), the second adhesive body 52 is filled in the gap formed by the second covering body 62 and formed between the second covering body 62 and the arc tube 2. The first covering body 61 and the second covering body 62 are separated from each other on the outer surface of the arc tube, and the first adhesive body 51 and the second adhesive body 52 are separated from each other. That is, the coverings 61 and 62 are not continuously provided in the circumferential direction of the outer surface of the arc tube 2, and the adhesive bodies 51 and 52 are not continuously provided in the circumferential direction of the outer surface of the arc tube 2. For this reason, in the environment where moisture adheres to the outer peripheral surface of the arc tube 2, it is possible to prevent moisture on the outer surface of the arc tube 2 from being continuously tied in the circumferential direction.

  For the coverings 61 and 62, for example, ABS resin or acrylic resin can be used as the resin having electrical insulation, and mullite, calmlite, cordierite, alumina, or the like is used as the ceramic material having electrical insulation. What was shape | molded and baked can be used. The adhesive bodies 51 and 52 can use the adhesive resin or the ceramic adhesive described in the first embodiment. By using such a material as the coverings 61 and 62 and the adhesive bodies 51 and 52, the electrical insulation outside the power supply terminals 43 and 44 on the surface where the external electrodes 41 and 42 are in contact with the power supply terminals 43 and 44 can be obtained. Can be improved. Furthermore, by using the above-described materials as the coverings 61 and 62, the outer sides of the power supply terminals 43 and 44 on the surface where the external electrodes 41 and 42 are in contact with the power supply terminals 43 and 44 (in the radial direction of the arc tube 2). The mechanical strength of the outer side can be improved.

  In the external electrode type rare gas fluorescent lamp 1 described above, when the lamp 1 is turned on, power is supplied to the power supply terminals 43 and 44 from a power supply device (not shown), and a pair of spaced apart external electrodes 41 and 42 electrically connected thereto are connected. Power is supplied. The coverings 61 and 62 that cover the power supply terminals 43 and 44 and the external electrodes 41 and 42 are spaced apart in the circumferential direction of the outer surface of the arc tube 2 and are bonded to the coverings 61 and 62. , 52 are spaced apart from each other in the circumferential direction of the outer surface of the arc tube 2, even if moisture is generated on the outer surface of the arc tube 2 due to dew condensation or the like, the pair of external electrodes 4 is not continuously bound. That is, since the coverings 61 and 62 and the adhesive bodies 51 and 52 are not continuously provided in the circumferential direction of the outer surface of the arc tube 2, creeping discharge due to moisture on the outer surface of the arc tube 2 can be prevented.

  An external electrode type rare gas fluorescent lamp 1 according to the present invention is provided in a tube axis direction of the arc tube 2 on the outer surface of the arc tube 2 and an arc tube 2 in which a rare gas is sealed and a phosphor 3 is provided on the inner surface. One external electrode 41, one power supply terminal 43 electrically connected to the one external electrode 41, and the arc tube at a position away from the one external electrode 41 in the circumferential direction of the arc tube 2. In the external electrode type rare gas fluorescent lamp 1, which includes the other external electrode 42 provided in the direction of the tube axis 2 and the other power supply terminal 44 electrically connected to the other external electrode 42. A first cover 61 is provided so as to cover the power supply terminal 43 so as not to be continuous with the other external electrode 42, and the first cover 61 and the arc tube 2 have a first electric insulation. Adhesive body 51 is continuous with the other external electrode 42. A second covering body 52 is provided so as to cover the other power supply terminal 44 and not to be continuous with the one external electrode 41 and the first adhesive body 51, and the second covering body 62. A second adhesive body 52 having electrical insulation is provided in a gap between the arc tube 2 and the arc tube 2 so as not to be continuous with the one external electrode 41, the first adhesive body 51, and the first covering body 61. As a result, the first cover 61 covers one power supply terminal 43 and the second cover 62 covers the other power supply terminal 44, so that the external electrodes 41 and 42 and the power supply terminals 43 and 44 are connected. It is possible to improve the mechanical strength outside the power supply terminal on the contact surface. Further, the first adhesive 51 is provided in the gap between the first cover 61 and the arc tube 2, and the second adhesive 52 is provided in the gap between the second cover 62 and the arc tube 2. Therefore, the connectivity between the power supply terminals 43 and 44 and the external electrodes 41 and 42 between the coverings 61 and 62 and the arc tube 2 can be improved. In addition, the first covering 61 is not continuous with the other external electrode 42, the first adhesive 51 is not continuous with the other external electrode 42, and the second covering 62 is connected to the one external electrode 41 and Since the first adhesive body 51 is not continuous and the second adhesive body 52 is not continuous with the one external electrode 41, the first adhesive body 51, and the first covering body 61, the outer peripheral surface of the arc tube 2 Even if moisture adheres to it, moisture can be prevented from being continuously connected between the external electrodes 41 and 42. Therefore, the external electrode type rare gas fluorescent lamp 1 according to the present invention can prevent the occurrence of creeping discharge between the external electrodes 41 and 42 in an environment where moisture adheres to the outer peripheral surface of the arc tube 2.

  In addition, even if it is a case where a pair of electric power feeding terminals 43 and 44 are separated in the longitudinal direction of the arc_tube | light_emitting_tube 2 as shown in FIG. 4, the covering bodies 61 and 62 shown in the 2nd Example can be used. . At this time, the first covering 61 is not continuous with the other external electrode 42, the first adhesive 51 is not continuous with the other external electrode 42, and the second covering 62 is connected to the one external electrode 41 and Since the second adhesive body 52 is not continuous with the one outer electrode 41, the first adhesive body 51, and the first covering body 61 without being continuous with the first adhesive body 51, the outer peripheral surface of the arc tube 2 is formed. Even if moisture adheres, it is possible to prevent moisture from being continuously connected between the external electrodes 41 and 42. For this reason, even if the power feeding terminals 43 and 44 are separated in the longitudinal direction of the arc tube 2, the external electrode type rare gas fluorescent lamp 1 according to the present invention adheres moisture to the outer peripheral surface of the arc tube 2. In the environment, the occurrence of creeping discharge between the external electrodes 41 and 42 can be prevented.

  A third embodiment of the external electrode type rare gas fluorescent lamp 1 according to the present invention will be described with reference to FIG.

FIG. 6 is an explanatory diagram of the external electrode type rare gas fluorescent lamp 1 according to the present invention. FIG. 6A is a perspective view of one end of the external electrode type rare gas fluorescent lamp 1 where the power supply terminals 43 and 44 are disposed. FIG. 6B is a diagram (a diagram viewed from the Y direction of FIG. 6A) viewed from the direction perpendicular to the tube axis direction of the external electrode type rare gas fluorescent lamp 1 of FIG. FIG. In FIG. 6, the same components as those shown in FIG.
6 is different from FIG. 5 in that a connection body 63 that connects the pair of covering bodies 61 and 62 is provided. As an explanation of FIG. 6, differences from FIG. 5 will be described.

  As shown in FIG. 6A, the pair of covering bodies 61 and 62 protrude from the outer surface of the end portion in the tube axis direction of the arc tube 2 in the tube axis direction of the arc tube 2. A connecting body 63 is provided so as to connect the protruding pair of covering bodies 41. Thereby, for example, even when a load is applied to the coverings 61 and 62 and the power feeding terminals 43 and 44 when the lamp 1 is replaced, the load can be distributed by the connecting body 63. The mechanical strength against the load can be improved. The connecting body 63 is provided on the covering bodies 61 and 62 protruding in the tube axis direction of the arc tube 2, and the connecting body 63 is provided so as to be separated from the end portion of the arc tube 2 in the tube axis direction. Since the connecting body 63 is provided on the covering bodies 61 and 62 projecting in the tube axis direction of the arc tube 2, it is possible to prevent the arc tube 2 from projecting in the radial direction. Undesirable protrusions can be prevented.

  In the external electrode type rare gas fluorescent lamp 1 described above, when the lamp 1 is turned on, power is supplied to the power supply terminals 43 and 44 from a power supply device (not shown), and a pair of spaced apart external electrodes 41 and 42 electrically connected thereto are connected. Power is supplied. The coverings 61 and 62 covering the power feeding terminals 43 and 44 and the external electrodes 41 and 42 are spaced apart in the circumferential direction of the outer surface of the arc tube 2, and the connecting body 63 connected to the coverings 61 and 62 is the arc tube. 2 is separated from the end in the tube axis direction, even if moisture is generated on the outer surface of the arc tube 2 due to dew condensation or the like, the pair of external electrodes 4 is not continuously bound to the moisture. That is, the coverings 61 and 62 are not continuously provided in the circumferential direction of the outer surface of the arc tube 2, and the connection body is not continuously provided on the end surface of the arc tube 2. Creeping discharge due to can be prevented.

  In the external electrode type rare gas fluorescent lamp 1 according to the present invention, the first covering 61 extends in the tube axis direction beyond the end surface of the arc tube 2 in the tube axis direction, and the second covering 62 is A connection body 63 is provided that extends in the tube axis direction beyond the end surface of the arc tube 2 in the tube axis direction and connects the extended first covering body 61 and the second covering body 62. As a result, even if a load is applied to the first covering body 61 or the second covering body 62, the load is distributed by the connecting body 63, so that the machine of the connected external electrodes 41, 42 and the power feeding terminals 43, 44 is performed. Strength can be improved. Furthermore, it is possible to prevent water from being continuously accumulated between the connection body 63 and the arc tube 2. Therefore, the external electrode type rare gas fluorescent lamp 1 according to the present invention can prevent the occurrence of creeping discharge between the external electrodes 41 and 42 in an environment where moisture adheres to the outer peripheral surface of the arc tube 2.

  A fourth embodiment of the external electrode type rare gas fluorescent lamp 1 according to the present invention will be described with reference to FIG.

FIG. 7 is an explanatory view of the external electrode type rare gas fluorescent lamp 1 according to the present invention. FIG. 7A is a perspective view of one end portion where the power supply terminals 43 and 44 of the external electrode type rare gas fluorescent lamp 1 are arranged. FIG. 7B is a diagram (a diagram viewed from the Y direction in FIG. 7A) viewed from the direction perpendicular to the tube axis direction of the external electrode type rare gas fluorescent lamp 1 of FIG. FIG. In FIG. 7, the same components as those shown in FIG.
FIG. 7 differs from FIG. 5 in that a pressing body 64 is provided on the pair of covering bodies 61 and 62. As an explanation of FIG. 7, differences from FIG. 5 will be described.

  A U-shaped pressing body 64 as shown in FIG. 7B is disposed outside the pair of covering bodies 61 and 62 (outside in the radial direction of the arc tube 2). The pressing body 64 is formed so that it can be pressed when it is arranged so as to sandwich the pair of covering bodies 61 and 62. When the pair of covering bodies 61 and 62 are pressed by the pressing body 64, the fixing of the covering bodies 61 and 62 to the power supply terminals 43 and 44 by the bonding function of the adhesive bodies 51 and 52 can be complemented. The fixing of the power supply terminals 61 and 62 to the power supply terminals 43 and 44 can be strengthened.

  Since the pressing body 64 is provided outside the pair of covering bodies 61 and 62 (outward in the radial direction of the arc tube 2), the pressing body 64 is between the pair of external electrodes 41 and 42 in the circumferential direction of the arc tube 2. Are not continuously connected, and the pair of power supply terminals 43 and 44 are not continuously connected. Furthermore, the pressing body 64 that presses the pair of covering bodies 61 and 62 is disposed so as to extend outward from the end face of the arc tube 2 in the tube axis direction, as shown in FIG. The pressing body 64 is separated from the end surface of the arc tube 2 in the tube axis direction. That is, the pressing body 64 cannot be provided continuously between the pair of external electrodes 41, 42 on the outer surface of the arc tube 2, and cannot be provided with the pair of power supply terminals 43, 44 continuously. Therefore, the pressing body 64 can prevent the moisture on the outer surface of the arc tube 2 from continuously connecting the circumferential direction and the end surface in an environment where moisture adheres to the outer surface of the arc tube 2.

  For the pressing body 64, for example, an ABS resin or an acrylic resin can be used as an electrically insulating resin, and a mullite, calmlite, cordierite, alumina, or the like is formed as an electrically insulating ceramic material. What was baked can be used.

  In the external electrode type rare gas fluorescent lamp 1 described above, when the lamp 1 is turned on, power is supplied to the power supply terminals 43 and 44 from a power supply device (not shown), and a pair of spaced apart external electrodes 41 and 42 electrically connected thereto are connected. Power is supplied. On the outer surface of the arc tube 2, the pressing body 64 that presses the covering bodies 61 and 62 cannot be continuously provided between the pair of external electrodes 41 and 42, and the pair of power supply terminals 43 and 44 is continuously provided. I can't. For this reason, even if moisture due to condensation or the like is generated on the outer surface of the arc tube 2, the moisture is not continuously connected between the pair of external electrodes 41 and 42. That is, the pressing body 64 is separated in the circumferential direction of the outer surface of the arc tube 2 and is separated from the end surface of the arc tube 2, thereby preventing creeping discharge due to moisture on the outer surface of the arc tube 2.

  In the external electrode type rare gas fluorescent lamp 1 according to the present invention, a pressing body 64 is provided so as to press the first covering body 61 or the second covering body 62 so as not to continue on the outer surface of the arc tube 2. Thus, since the pressing body 64 presses the first covering body 61 or the second covering body 62, the fixing of the covering bodies 61 and 62 to the power supply terminals 43 and 44 by the bonding function of the bonding bodies 51 and 52 is complemented. It is possible to strengthen the fixing of the coverings 61 and 62 to the power supply terminals 43 and 44. Further, since the pressing body 64 is provided so as not to be continuous on the outer surface of the arc tube 2, it is possible to prevent moisture from being continuously accumulated between the arc tube 2 and the pressing body 64. Therefore, the external electrode type rare gas fluorescent lamp 1 according to the present invention can prevent the occurrence of creeping discharge between the external electrodes 41 and 42 in an environment where moisture adheres to the outer peripheral surface of the arc tube 2.

  Another embodiment of the fourth embodiment of the external electrode type rare gas fluorescent lamp 1 according to the present invention will be described with reference to FIG.

FIG. 8 is an explanatory diagram of the external electrode type rare gas fluorescent lamp 1 according to the present invention. FIG. 8A is a perspective view of one end of the external electrode type rare gas fluorescent lamp 1 where the power supply terminals 43 and 44 are disposed. FIG. 8B is a view as viewed from the direction perpendicular to the tube axis direction of the external electrode type rare gas fluorescent lamp 1 of FIG. 8A (viewed from the Y direction of FIG. 8A). FIG. In FIG. 8, the same components as those shown in FIG.
FIG. 8 is different from FIG. 7 in that one feeding terminal 43 is provided on one end side in the longitudinal direction of the arc tube 2 and a pressing body 64 is provided on one feeding terminal 43. As an explanation of FIG. 8, differences from FIG. 7 will be described.

One feed terminal 43 and the other feed terminal (not shown) of the external electrode type rare gas fluorescent lamp 1 according to the present embodiment are arranged in the longitudinal direction of the arc tube 2 as in the external electrode type rare gas fluorescent lamp 1 of FIG. The both ends are arranged apart from each other. FIG. 8 is a view showing one end of the arc tube 2 in the longitudinal direction.
A U-shaped pressing body 64 as shown in FIG. 8B is disposed on the covering body 61 disposed outside the one power supply terminal 43. Since the pressing body 64 is U-shaped, the pressing body 64 is disposed on the outer surface of the external electrode 42 provided on the opposite side of the covering body 61 in the circumferential direction of the arc tube 2. Further, an adhesive body 52 is provided between the pressing body 64 and the arc tube 2 to prevent the pressing body 64 from coming off the arc tube 2. The pressing body 64 is formed so that it can be pressed when it is disposed so as to sandwich the covering body 61 and the external electrode 42. By pressing the covering body 61 with the pressing body 64, the fixing of the covering body 61 to the power supply terminal 43 by the bonding function of the adhesive body 51 can be complemented, and the fixing of the covering body 61 to the power feeding terminal 43 is firmly performed. Can be.

  As shown in FIG. 8B, the pressing body 64 is disposed so as to extend outward from the end surface of the arc tube 2 in the tube axis direction. The pressing body 64 is separated from the end surface of the arc tube 2 in the tube axis direction. That is, the pressing body 64 is not continuously provided between the pair of external electrodes 41 and 42 on the outer surface of the arc tube 2, and is continuously provided with one power supply terminal 43 and the other power supply terminal (not shown). I can't. Therefore, the pressing body 64 can prevent the moisture on the outer surface of the arc tube 2 from continuously connecting the circumferential direction and the end surface in an environment where moisture adheres to the outer surface of the arc tube 2.

When the lamp 1 is lit, the external electrode type rare gas fluorescent lamp 1 described above is supplied with power from one power supply device (not shown) to one power supply terminal 43 and the other power supply terminal 44, and is electrically connected to a pair of spaced apart power supplies. Power is supplied to the external electrodes 41 and 42. On the outer surface of the arc tube 2, the pressing body 64 that presses the covering body 61 is not continuously provided between the pair of external electrodes 41 and 42, and the one feeding terminal 43 and the other feeding terminal 44 are continuously provided. Is not provided. For this reason, even if moisture due to condensation or the like is generated on the outer surface of the arc tube 2, the moisture is not continuously connected between the pair of external electrodes 41 and 42. That is, the pressing body 64 is separated in the circumferential direction of the outer surface of the arc tube 2 and is separated from the end surface of the arc tube 2, thereby preventing creeping discharge due to moisture on the outer surface of the arc tube 2.
The external electrode type rare gas fluorescent lamp 1 according to the present embodiment can obtain the same effects as those of the external electrode type rare gas fluorescent lamp 1 described in the fourth embodiment.

  Another embodiment of the fourth embodiment of the external electrode type rare gas fluorescent lamp 1 according to the present invention will be described with reference to FIG.

FIG. 9 is an explanatory diagram of the external electrode type rare gas fluorescent lamp 1 according to the present invention. FIG. 9A is a perspective view of one end portion where the power supply terminals 43 and 44 of the external electrode type rare gas fluorescent lamp 1 are arranged. 9B is a cross-sectional view perpendicular to the tube axis direction of the external electrode type rare gas fluorescent lamp 1 of FIG. 9A (cross-sectional view taken along line EE of FIG. 9A). FIG. In FIG. 9, the same components as those shown in FIG.
FIG. 9 is different from FIG. 7 in the shape of the pressing body 64 provided on the pair of covering bodies 61 and 62. As an explanation of FIG. 9, differences from FIG. 7 will be described.

  As shown in FIG. 9B, a semi-elliptical pressing body in which an ellipse is cut at a short diameter portion on the outside of the pair of covering bodies 61 and 62 (outside in the radial direction of the arc tube 2). 64 is arranged. The pressing body 64 is formed so that it can be pressed when it is arranged so as to sandwich the pair of covering bodies 61 and 62. When the pair of covering bodies 61 and 62 are pressed by the pressing body 64, the fixing of the covering bodies 61 and 62 to the power supply terminals 43 and 44 by the bonding function of the adhesive bodies 51 and 52 can be complemented. The fixing of the power supply terminals 61 and 62 to the power supply terminals 43 and 44 can be strengthened.

  The semi-elliptical pressing body 64 is separated from the outer surface in the circumferential direction of the arc tube 2 and is provided on the outer surfaces of the pair of covering bodies 61 and 61. Therefore, the pressing body 64 does not continuously connect the pair of external electrodes 41 and 42 in the circumferential direction of the arc tube 2 and does not continuously connect the pair of power supply terminals 43 and 44. For this reason, the pressing body 64 can prevent the moisture on the outer surface of the arc tube 2 from being continuously tied in the circumferential direction in an environment where moisture adheres to the outer surface of the arc tube 2.

In the external electrode type rare gas fluorescent lamp 1 described above, when the lamp 1 is turned on, power is supplied to the power supply terminals 43 and 44 from a power supply device (not shown), and a pair of spaced apart external electrodes 41 and 42 electrically connected thereto are connected. Power is supplied. On the outer surface of the arc tube 2, the pressing body 64 that presses the covering bodies 61 and 62 cannot be continuously provided between the pair of external electrodes 41 and 42, and the pair of power supply terminals 43 and 44 is continuously provided. I can't. For this reason, even if moisture due to condensation or the like is generated on the outer surface of the arc tube 2, the moisture is not continuously connected between the pair of external electrodes 41 and 42. That is, the pressing body 64 is separated in the circumferential direction of the outer surface of the arc tube 2, thereby preventing creeping discharge due to moisture on the outer surface of the arc tube 2.
The external electrode type rare gas fluorescent lamp 1 according to the present embodiment can obtain the same effects as those of the external electrode type rare gas fluorescent lamp 1 described in the fourth embodiment.

  Another embodiment of the fourth embodiment of the external electrode type rare gas fluorescent lamp 1 according to the present invention will be described with reference to FIG.

FIG. 10 is an explanatory diagram of the external electrode type rare gas fluorescent lamp 1 according to the present invention. FIG. 10A is a perspective view of one end portion where the power supply terminals 43 and 44 of the external electrode type rare gas fluorescent lamp 1 are arranged. 10B is a cross-sectional view perpendicular to the tube axis direction of the external electrode type rare gas fluorescent lamp 1 shown in FIG. 10A (a cross-sectional view taken along line FF in FIG. 10A). FIG. In FIG. 10, the same components as those shown in FIG. 1 are denoted by the same reference numerals.
10 is different from FIG. 7 in the shape of the pressing body 64 provided on the pair of covering bodies 61 and 62. As an explanation of FIG. 10, differences from FIG. 7 will be described.

  As shown in FIG. 10 (b), a shape in which a concave portion is formed on the outer surface of the pair of covering bodies 61, 62 toward the inner surface as shown in FIG. 10 (b). The pressing body 64 is arranged. The pressing body 64 is formed so that it can be pressed when it is arranged so as to sandwich the pair of covering bodies 61 and 62. When the pair of covering bodies 61 and 62 are pressed by the pressing body 64, the fixing of the covering bodies 61 and 62 to the power supply terminals 43 and 44 by the bonding function of the adhesive bodies 51 and 52 can be complemented. The fixing of the power supply terminals 61 and 62 to the power supply terminals 43 and 44 can be strengthened.

  A pressing body 64 having a shape in which a concave portion of an elliptical short diameter is formed toward the inner surface is provided on the outer surface of the pair of covering bodies 61, 61 and is separated from the outer surface in the circumferential direction of the arc tube 2. Therefore, the pressing body 64 does not continuously connect the pair of external electrodes 41 and 42 in the circumferential direction of the arc tube 2 and does not continuously connect the pair of power supply terminals 43 and 44. For this reason, the pressing body 64 can prevent the moisture on the outer surface of the arc tube 2 from being continuously tied in the circumferential direction in an environment where moisture adheres to the outer surface of the arc tube 2.

In the external electrode type rare gas fluorescent lamp 1 described above, when the lamp 1 is turned on, power is supplied to the power supply terminals 43 and 44 from a power supply device (not shown), and a pair of spaced apart external electrodes 41 and 42 electrically connected thereto are connected. Power is supplied. On the outer surface of the arc tube 2, the pressing body 64 that presses the covering bodies 61 and 62 cannot be continuously provided between the pair of external electrodes 41 and 42, and the pair of power supply terminals 43 and 44 is continuously provided. I can't. For this reason, even if moisture due to condensation or the like is generated on the outer surface of the arc tube 2, the moisture is not continuously connected between the pair of external electrodes 41 and 42. That is, the pressing body 64 is separated in the circumferential direction of the outer surface of the arc tube 2, thereby preventing creeping discharge due to moisture on the outer surface of the arc tube 2.
The external electrode type rare gas fluorescent lamp 1 according to the present embodiment can obtain the same effects as those of the external electrode type rare gas fluorescent lamp 1 described in the fourth embodiment.

In the external electrode type rare gas fluorescent lamp shown in the above embodiment, the external electrode is disposed on the outer surface of the arc tube, and the external electrode is exposed to the atmosphere. Since the external electrode includes a metal such as silver, the metal may be oxidized and deteriorated when exposed to the atmosphere. For this reason, the surface of the external electrode disposed on the outer surface of the arc tube is covered with an electrically insulating resin such as fluorine resin, acrylic resin or polyimide resin to prevent deterioration of the external electrode due to oxidation. can do.
Further, the means for preventing deterioration of the external electrode is not limited to coating with resin, and may be coating with a ceramic material or frit glass having electrical insulation. This coating is made by appropriately mixing an electrically insulating ceramic material or frit glass powder with an organic solvent or a binder, and this paste is applied to an external electrode disposed on the outer surface of the arc tube by a printing method or the like. It can be formed by coating the surface and firing at the melting or sintering temperature. As the frit glass, it is possible to use a glass composed mainly of bismuth (Bi), boron (B), zinc (Zn), etc., and silicon dioxide (SiO ₂ ) or the like as a filler.

It is explanatory drawing of the external electrode type rare gas fluorescent lamp which concerns on this invention. It is explanatory drawing of the external electrode type rare gas fluorescent lamp which concerns on this invention. It is explanatory drawing of the external electrode type rare gas fluorescent lamp which concerns on this invention. It is explanatory drawing of the external electrode type rare gas fluorescent lamp which concerns on this invention. It is explanatory drawing of the external electrode type rare gas fluorescent lamp which concerns on this invention. It is explanatory drawing of the external electrode type rare gas fluorescent lamp which concerns on this invention. It is explanatory drawing of the external electrode type rare gas fluorescent lamp which concerns on this invention. It is explanatory drawing of the external electrode type rare gas fluorescent lamp which concerns on this invention. It is explanatory drawing of the external electrode type rare gas fluorescent lamp which concerns on this invention. It is explanatory drawing of the external electrode type rare gas fluorescent lamp which concerns on this invention. It is explanatory drawing of the external electrode type rare gas fluorescent lamp which concerns on the past.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 External electrode type rare gas fluorescent lamp 2 Luminescent tube 21 Inside of luminous tube 3 Phosphor 41 One external electrode 42 The other external electrode 43 One power supply terminal 44 The other power supply terminal 45 One power supply line 46 The other power supply line 47 Connector 48 Conductive bonded body 51 First adhesive body 52 Second adhesive body 53 Gap 61 First insulating covering body 62 Second insulating covering body 63 Connecting body 64 Pressing body

Claims (3)

An arc tube in which a rare gas is sealed and a phosphor is provided on the inner surface;
One external electrode provided in the tube axis direction of the arc tube on the outer surface of the arc tube;
One power supply terminal electrically connected to the one external electrode at an end of the arc tube;
The other external electrode provided in the tube axis direction of the arc tube at a position away from the one external electrode in the circumferential direction of the arc tube;
The other feeding terminal electrically connected to the other external electrode at the end of the arc tube;
In the external electrode type rare gas fluorescent lamp consisting of
A first adhesive body having electrical insulation is provided so as to cover the one feeding terminal and the one external electrode at the end of the arc tube ,
A second adhesive having electrical insulation is provided so as to cover the other feeding terminal and the other external electrode at the end of the arc tube ;
The first adhesive body and the second adhesive body are separated from each other on the outer surface of the arc tube,
An external electrode fluorescent lamp characterized by that. An arc tube in which a rare gas is sealed and a phosphor is provided on the inner surface;
One external electrode provided in the tube axis direction of the arc tube on the outer surface of the arc tube;
One power supply terminal electrically connected to the one external electrode at an end of the arc tube;
The other external electrode provided in the tube axis direction of the arc tube at a position away from the one external electrode in the circumferential direction of the arc tube;
The other feeding terminal electrically connected to the other external electrode at the end of the arc tube;
In the external electrode type rare gas fluorescent lamp consisting of
A first covering body is provided so as to cover the one power supply terminal at an end of the arc tube, and a first adhesive having electrical insulation is provided in a gap between the first covering body and the arc tube. A body is provided,
A second cover is provided at the end of the arc tube so as to cover the other power supply terminal, and a second adhesive having electrical insulation is provided in the gap between the second cover and the arc tube. A body is provided,
The first covering body and the second covering body, and the first adhesive body and the second adhesive body are separated from each other on the outer surface of the arc tube,
An external electrode type rare gas fluorescent lamp characterized by that. The first cover is extended in the tube axis direction beyond the end surface of the arc tube in the tube axis direction;
The second covering body extends in the tube axis direction beyond the end surface of the arc tube in the tube axis direction;
The external electrode type rare gas fluorescent lamp according to claim 2, wherein a connection body that connects the extended first covering body and the second covering body is provided.

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