JP2010192340A - Electrode mount and hot-cathode lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrain a contact at a spiral section of a filament when using the spiral filament. <P>SOLUTION: In an electrode mount 3 where the filament 32 is connected to first and second leads 31a, 31b, the first and second leads 31a, 31b respectively have first and second flat sections 311a, 311b, and the filament 32 has first and second leg sections 321a, 321b, and the spiral section 322 connected to the first and second sections 321a, 321b. The first leg section 321a is connected to the first flat section 311a, and the second leg section 321b is connected to the second section 311b. When the center of the spiral section 322 is set up to be O, the first leg section 321a and the second leg section 321b are arranged so as to be approximate point-symmetry to the center O. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electrode mount for a hot cathode lamp.

  Conventionally, hot cathode lamps have been used in the field of general lighting such as room lamps. Recently, attempts have been made to use the hot cathode lamps as light sources for backlights of monitors of liquid crystal televisions and personal computers.

  A hot cathode lamp used for such an application is required to have a small diameter in order to reduce the thickness of a backlight or the like. However, when the diameter of the lamp is reduced, there is a problem that it is difficult to extend the life because the amount of the emitter that can be applied to the filament is reduced. Therefore, in order to realize a narrow tube and a long service life, a filament wound spirally in the tube axis direction as shown in Patent Document 1 is used in a hot cathode lamp.

  Here, as shown in Patent Document 2, for the connection between the spiral filament and the lead, a connection different from the case of the conventional linear filament is adopted.

Japanese Patent Laid-Open No. 2005-235749 JP 2008-117632 A

  However, when a spiral filament as in Patent Document 1 or Patent Document 2 is used, there is a problem that the spiral portion is deformed and adjacent metal wires come into contact with each other.

  An object of the present invention is to provide an electrode mount and a hot cathode lamp capable of suppressing contact at a spiral portion of a filament when a spiral filament is used.

  In order to achieve the above object, an electrode mount of the present invention is an electrode mount in which a filament is connected to first and second leads, and the first and second leads are first and second flat surfaces. Part, the filament comprises first and second leg parts, and a spiral part connected to the first and second leg parts, the first leg part on the first flat part, The second leg portion is connected to the second flat portion, and when the center of the spiral portion is O, the first leg portion and the second leg portion are the center O. Are arranged so as to be substantially point-symmetric with respect to each other.

  According to the present invention, when a spiral filament is used, contact at the spiral portion of the filament can be suppressed.

The figure for demonstrating the hot cathode lamp of the 1st Embodiment of this invention. The enlarged view of a hot cathode lamp. The perspective view of an electrode mount. Explanatory drawing of a filament. The figure for demonstrating the hot cathode lamp of the 2nd Embodiment of this invention. The figure for demonstrating the hot cathode lamp of the 3rd Embodiment of this invention. The figure for demonstrating the modification of this invention.

(First embodiment)
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an overall view of a hot cathode lamp according to a first embodiment of the present invention, FIG. 2 is an enlarged view of the hot cathode lamp, (a) is a side view, and (b) is a straight line X in FIG. It is the figure which looked at the cross section of -X 'from the arrow direction.

  As shown in FIG. 1, the hot cathode lamp according to the present embodiment includes a glass bulb 1 made of hard glass, for example. The glass bulb 1 includes a light emitting unit 11 and a sealing unit 12. The light emitting unit 11 is a glass tube having an outer diameter R1 = 3 mm to 8 mm and an inner diameter R2 = 2 mm to 7 mm, and is located in the center portion of the glass bulb 1. The sealing part 12 is a glass reservoir for forming an airtight internal space in the glass bulb 1, and is located at both ends of the light emitting part 11.

  A discharge medium is sealed in the internal space of the glass bulb 1. The discharge medium is composed of mercury and a gas formed by mixing or mixing rare gases such as neon, argon, xenon, and krypton. Further, on the inner surface of the light emitting unit 11, for example, a phosphor layer 2 made of RGB three-wavelength phosphor is formed.

  An electrode mount 3 as shown in FIG. 3 is sealed on the sealing portion 12. The electrode mount 3 includes first and second leads 31a and 31b, a filament 32, an emitter 33, and beads 34.

  The first and second leads 31a and 31b are, for example, metal wires made of Kovar with a wire diameter of 0.2 mm to 1.0 mm, sealed to the sealing portion 12 part, and one end in the glass bulb 1. The other end is led out of the glass bulb 1. First and second flat portions 311a and 311b are formed by pressing at the tip portions of the first and second leads 31a and 31b disposed inside the glass bulb 1.

  The filament 32 includes a pair of leg portions 321 a and 321 b and a spiral portion 322. The leg portions 321a and 321b are single coils in which a metal wire made of, for example, a tungsten wire is formed in a spiral shape, and are extended in the tube axis direction so as to maintain a substantially parallel relationship. The spiral portion 322 has a so-called double helical shape in which single coils having different timings are spirally wound from the leg portions 321a and 321b. Specifically, as shown in FIG. 4, the first and second helical portions 322a and 322b whose timings are shifted from each other by a half pitch from the ends of the leg portions 321a and 321b are respectively turned one turn, two turns,. And the shape is connected to each other at the final end, and the final end is located inside the loop of the spiral portion 322. The first and second helical portions 322a and 322b are not in contact with each other.

  The emitter 33 is formed in a part of the first and second leg portions 321 a and 321 b and the spiral portion 322. The emitter 33 can be formed at a predetermined location of the filament 32 by applying and drying an emitter solution in which (Ba, Ca, Sr) O and a solvent are mixed, for example.

  The bead 34 is a spherical glass ball made of the same material as the glass bulb 1, and is uniaxial with each of the first and second leads 31a and 31b so as to straddle between the first and second leads 31a and 31b. The part is sealed. The beads 34 keep the distance between the first and second leads 31a and 31b constant and facilitate the sealing of the electrode mount 33 to the end of the glass bulb 1.

  The electrode mount 3 will be described in more detail with reference to FIG.

  The first and second flat portions 311a and 311b are arranged such that their longitudinal directions are located on a straight line YY ′ passing through the center O of the spiral portion 322, that is, each flat surface is parallel to the straight line YY ′. The first leg portion 321a is connected to the flat surface of the first flat portion 311a, and the second leg portion 321b is connected to the flat surface of the second flat portion 311b, respectively. Yes. At this time, the first leg portion 321a and the second leg portion 321b are connected to the flat surface of the first flat portion 311a and the flat surface of the second flat portion 311b respectively facing in different directions. As a result, the first leg portion 321a and the second leg portion 321b are substantially point-symmetric with respect to the center O. Therefore, even when the filament 32 is deformed by twisting or the like due to an external force or the like, the first and second helical portions 322a and 322b are deformed in the same manner, so that contact between adjacent portions is suppressed. be able to. Note that “substantially point symmetry” includes a deviation that does not cause the first and second helical portions 322a and 322b to be greatly different from each other when an external force is generated in the filament 32. It is permissible to allow such a displacement that one leg portion is connected to a flat surface so as to be slightly displaced from the point-symmetrical position.

  The electrode mount (Example) of the present invention as shown in FIG. 2 and an electrode mount (see Patent Documents 1 and 2) in which a pair of leads are respectively connected on a pair of flat surfaces facing the same direction. 50 of each of the conventional examples) were manufactured, and sealed with a glass bulb to obtain a lamp and subjected to a vibration test. When manufacturing the electrode mount, resistance welding was performed for the connection between the lead and the filament, and for the vibration test, an electrode mount without an emitter applied was sealed to the lamp.

  As a result, when the electrode mount is manufactured in the conventional example, the shape of the filament 32, particularly the shape of the spiral portion 322, has already changed in 45 pieces, and the adjacent portions are in contact with each other, whereas in the embodiment, Compared with the conventional example, the change in the shape of the filament 32 was small, and the contact between adjacent portions was about seven, showing a significant improvement. Furthermore, as a result of selecting only the electrode mount that did not come into contact after manufacture and sealing it to the glass bulb 1 and conducting a vibration test, in the conventional example, contact is generated at the spiral portion 322 in almost all cases. In the examples, about two were in contact.

  Thus, the large difference in the contact state of the filament between the conventional example and the embodiment is related to the connection between the lead and the filament. That is, as in the conventional example, one leg part is connected to the flat part so as to be in the winding direction of the spiral part, and the other leg part is connected to the flat part so that the winding direction is opposite to the spiral part. In this case, when an external force is generated in the filament, the amount of twist and the amount of displacement of the first and second helical portions 322a and 322b are different. As a result, the 1st cross and the 2nd cross that are most affected by the deformation. It is probable that contact occurred in the vicinity. On the other hand, in the embodiment, since both the leg portions are connected to the flat portion so as to be in the winding direction of the spiral portion, even if an external force is generated in the filament, the first and second helical portions 322a and 322b It is considered that contact is avoided because the deformation is such that the movements are relatively the same. In addition, even if both leg parts are connected to a flat part so that it may become the reverse winding direction of a helical part, a contact can be avoided similarly.

  Therefore, in the present embodiment, the first flat portion 311a and the second flat portion 311b are arranged so that their longitudinal directions are substantially aligned with each other, and the first leg portion 321a is the first flat portion 321a. The second leg portion 321b is connected to the flat surface of the flat portion 311a and the flat surface of the second flat portion 311b facing the direction different from the flat surface to which the first leg portion 321a is connected. Even when an external force is generated in the filament 32, contact in an adjacent portion of the spiral portion 322, particularly in the vicinity of the 1st cross or the 2nd cross, can be suppressed.

(Second Embodiment)
FIG. 5 is a diagram for explaining a hot cathode lamp according to a second embodiment of the present invention. About each part of subsequent embodiment, the same part as each part of 1st Embodiment is shown with the same code | symbol, and the description is abbreviate | omitted.

  In the second embodiment, the first flat portion 321a and the second flat portion 321b are arranged so that the flat surfaces thereof are opposed to each other, and the first and second leg portions 311a and 311b are first and second. The flat portions 321a and 321b are respectively connected to the inward flat surfaces. The first and second leg portions 311a and 311b are arranged on the straight line Y-Y '.

  In this embodiment as well, as in the first embodiment, even when an external force is generated in the filament 32, it is possible to suppress contact between adjacent portions of the spiral portion 322, particularly in the vicinity of the 1st cross or the 2nd cross. In addition, since the first and second leg portions 311 a and 311 b are arranged on the straight line YY ′, the filament 32 can be arranged concentrically with the light emitting unit 11, and thus a part of the spiral portion 322. The temperature of the filament 32 can be kept uniform without approaching the inner wall of the lamp.

(Third embodiment)
FIG. 6 is a diagram for explaining a hot cathode lamp according to a third embodiment of the present invention.

  In the third embodiment, the first flat portion 321a and the second flat portion 321b are arranged so that the flat surfaces thereof are opposed to each other, and the first and second leg portions 311a and 311b are first and second. The flat portions 321a and 321b are respectively connected to the flat surfaces on the outward side. The first and second leg portions 311a and 311b are arranged on the straight line Y-Y '.

  In this embodiment, the same effects as those of the second embodiment can be obtained, and the distance between the first and second leads 31a and 31b can be shortened compared to the other embodiments. Contact between the leads 31a and 31b and the inner wall of the lamp can be suppressed.

  The embodiment of the present invention is not limited to the above, and may be modified as follows, for example.

  The sealing portion 12 is not limited to the bead seal but may be formed by a sealing method such as a pinch seal, a stem seal, or a button seal.

  The first and second leads 31a and 31b are not limited to those of a single member. For example, the part located in the light emitting part 11 is nickel, the part sealed in the sealing part 12 and the part led out to the outside is used. You may use what combined multiple members, such as a member comprised with jumet.

  The first and second flat portions 311a and 311b are not limited to being integrated with the first and second leads 31a and 31b, and may be separate from each other, that is, a flat plate-like flat plate-like lead. The part may be welded.

  The filament 32 is not limited to a single coil, and may be a double coil, a triple coil, or the like.

  Regarding the connection between the first and second leads 31a and 31b and the filament 32, after the first and second leg portions 321a and 321b are welded to the first and second flat portions 311a and 311b, as shown in FIG. The first and second leads 31a and 31b may be bent in the direction of 0.25 turns. Thereby, since the distance of the 1st, 2nd helical parts 322a and 322b of a 1st cross part leaves | separates, a contact can be suppressed. Note that only the first and second flat portions 311a and 311b may be bent.

  The connection between the first and second leads 31a and 31b and the filament 32 is not limited to resistance welding, and may be laser welding or the like.

DESCRIPTION OF SYMBOLS 1 Glass bulb 2 Phosphor layer 3 Electrode mount 31a, 31b 1st, 2nd lead 311a, 311b 1st, 2nd flat part 32 Filament 321a, 321b 1st, 2nd leg part 322 Spiral part 322a, 322b First and second helical parts 33 Emitter 34 Bead

Claims (5)

An electrode mount in which a filament is connected to first and second leads,
The first and second leads include first and second flat portions, the filament includes first and second leg portions, and a spiral portion connected to the first and second leg portions. The first leg portion is connected to the first flat portion, and the second leg portion is connected to the second flat portion, respectively.
When the center of the spiral portion is O, the first leg portion and the second leg portion are arranged so as to be substantially point-symmetric with respect to the center O. mount. An electrode mount in which a filament is connected to first and second leads,
The first and second leads include first and second flat portions, the filament includes first and second leg portions, and a spiral portion connected to the first and second leg portions. ,
The first flat part and the second flat part are arranged so that their longitudinal directions are positioned substantially on a straight line, and the first leg part is on the flat surface of the first flat part. The electrode mount is characterized in that the second leg portion is connected to the flat surface of the second flat portion facing in a direction different from the flat surface to which the first leg portion is connected. An electrode mount in which a filament is connected to first and second leads,
The first and second leads include first and second flat portions, the filament includes first and second leg portions, and a spiral portion connected to the first and second leg portions. ,
The first flat portion and the second flat portion are arranged so that their flat surfaces face each other, and the first and second leg portions are inward of the first and second flat portions. An electrode mount connected to a flat surface on the side or outward side.   The electrode mount according to claim 3, wherein the first and second leg portions and the center O are arranged on a straight line. A valve,
A hot cathode lamp comprising: the electrode mount according to any one of claims 1 to 4, which is sealed to an end of the bulb.

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