JP2008140699A - Fluorescent lamp, and lighting fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluorescent lamp which is hardly broken by a shock or the like, can be manufactured inexpensively, and can prevent a failure due to an abnormal discharge at the end of lifetime, and to provide a lighting fixture installed with this fluorescent lamp. <P>SOLUTION: The fluorescent lamp 1 is equipped with a pair of lead wires 2, 2 supporting both end sides of a filament 8, an arc tube 3 made of glass which has respectively a squeezed sealing part 11 with the pair of lead wires 2, 2 sealed at both end parts 9a, 9a and in which the pair of lead wires 2, 2 are respectively led out from the both end part 9a, 9a, and recessed parts 15, 15 recessed toward the lead wires 2, 2 are formed at a part of the outer face 11a of the squeezed part 11 so as to be opposed to the lead wires 2, 2, a phosphor film 4 formed on the inner face side of the arc tube 3, and a discharge medium filled inside the arc tube 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fluorescent lamp capable of preventing problems due to abnormal discharge occurring at the end of its life and a lighting fixture including the fluorescent lamp.

  A fluorescent lamp that is lit at a high frequency has advantages such as improved luminous efficiency and no flickering of brightness. However, when the electron emitting material of one electrode is consumed due to long-time lighting, a direct-current lighting (half-wave discharge) state is likely to occur. When this direct current lighting state is set, electrons in and out of the filament concentrate on a part of the filament, and the temperature of the part rises abnormally. For this reason, problems such as melting of a resin material such as a base or a socket located near the electrode due to heat may occur.

  Conventionally, in order to prevent the above-described problems, in a lighting device, it is performed to detect abnormal lighting of a fluorescent lamp and forcibly turn off the fluorescent lamp. However, in the lighting device that does not have such a function, the above-described problem cannot be prevented.

In view of this, it has been attempted to prevent a problem that occurs with the fluorescent lamp itself due to an abnormal temperature rise of the electrode at the end of its life. For example, a thermal fuse is attached to the inside of the base, and the fluorescent lamp is turned off by fusing the thermal fuse at an abnormal temperature. Further, a fluorescent lamp has been proposed in which the thickness of the glass forming the stem is reduced (see, for example, Patent Document 1). In this conventional fluorescent lamp, the glass in the thin glass portion of the stem is broken due to abnormal overheating accompanying an abnormal temperature rise of the electrode, and the discharge stops when the atmosphere flows into the arc tube.
Japanese Patent Laid-Open No. 2003-331787 (page 3, FIG. 1)

  In the fluorescent lamp of Patent Document 1, since the thickness of the thin glass portion of the stem is formed to be 0.2 to 0.5 mm, it takes time and effort to manage processes such as a manufacturing process for accurately forming the thickness. As a result, the cost is high. Further, since the thin glass portion of the stem is a space on both sides thereof, there is a risk that breakage such as cracks may occur when an impact or the like is applied to the fluorescent lamp.

  An object of the present invention is to provide a fluorescent lamp that can be manufactured inexpensively and is less likely to be undesirably destroyed by an impact or the like, and that can prevent problems due to abnormal discharge at the end of its life, and a lighting fixture that includes the fluorescent lamp.

  The invention of the fluorescent lamp according to claim 1 has a pair of lead wires supporting both ends of the filament; and a crushing sealing portion in which the pair of lead wires are sealed at both ends. The pair of lead-in wires are led out from both end portions, and a concave portion is formed on a part of the outer surface of the crushing sealing portion so as to face the lead-in wire so as to face the lead-in wire. A phosphor film formed on the inner surface side of the arc tube; and a discharge medium sealed inside the arc tube.

  In the present invention and each of the following inventions, each configuration is as follows unless otherwise specified.

  The arc tube may have any shape such as a straight tube shape, a ring shape or a bent shape.

  The crushing sealing part may be formed in flare glass, or may be formed by crushing the end of the glass bulb with a pincher.

  “The concave portion faces the introduction line” means that when the concave portion is projected from a direction orthogonal to the virtual plane onto the virtual plane formed including the pair of introduction lines, the introduction line is applied to the projected portion. Means that at least a part of is located.

  The concave portion can be formed immediately after the crushing sealing portion is formed or simultaneously with the formation of the crushing sealing portion by pressing the outer surface of the crushing sealing portion with a pincher. And the shape of a recessed part may be arbitrary, such as columnar shape, square shape, groove shape, and dish shape. Moreover, although the recessed part may be formed with respect to one of a pair of introductory lines, it is desirable to be formed with respect to both, respectively.

  “The phosphor film formed on the inner surface side of the arc tube” means that the phosphor film may be formed directly on the inner surface of the arc tube, and on an intermediate layer such as a protective film formed on the inner surface of the arc tube. It means that it may be formed.

  According to the present invention, when an abnormal discharge occurs in the filament or the pair of lead wires at the end of the life and the part abnormally generates heat, the temperature of the crushing sealing part rapidly increases, and the outer surface (surface) of the crushing sealing part Gradually melts, and the size (depth) of the recesses increases. Then, when the space between the introduction line and the concave portion having a relatively small thickness is melted and the outer surface of the introduction line is exposed to the extent that the concave portion reaches the introduction line and the outer surface of the introduction line is exposed, for example, the glass of the crushing sealing portion by abnormal heating When the temperature difference between the lead and the lead wire increases, the sealing property between the glass and the lead wire is impaired, and a gap is formed between the glass and the lead wire. This gap expands along the lead-in line, eventually reaches the sealing end of the crushing sealing portion and vents to the atmosphere and the inside of the arc tube. Thereby, the inside of the arc tube is vented to the atmosphere, and the abnormal discharge of the fluorescent lamp is stopped.

  And since the recessed part is formed so that it may oppose an introductory line, even if an impact etc. are added to an arc_tube | light_emitting_tube without a thin part being formed in a crushing sealing part, destruction of a crushing sealing part is prevented. .

  According to a second aspect of the present invention, there is provided the fluorescent lamp according to the first aspect, wherein the recess is formed so that the minimum thickness up to the lead-in line is 0.3 to 1.5 mm. And

  If the minimum wall thickness is less than 0.3 mm, it is difficult to manufacture with the wall thickness. Further, if the minimum thickness exceeds 1.5 mm, it takes time for the glass of the crushing sealing portion to melt and the concave portion to expand to the lead-in line. During this period, due to abnormal heat generation due to abnormal lighting, the base or socket There is a risk of thermal damage. Therefore, the minimum wall thickness is 0.3 to 1.5 mm. Further, from the viewpoint of facilitating the manufacture of the recess and turning off abnormal lighting earlier, it is preferable that the minimum thickness is formed to be 0.5 to 1.0 mm.

  According to the present invention, the concave portion is formed so that the minimum wall thickness up to the lead-in line is 0.3 to 1.5 mm, so that it is easily formed by pressing, for example, a pincher on the outer surface of the crushing sealing portion. At the same time, it melts and expands to the outer surface of the lead-in line at the time of abnormal lighting.

  According to a third aspect of the present invention, there is provided a fluorescent lamp according to the first or second aspect, wherein a plurality of recesses are formed so as not to face each other across the lead-in line.

  “A plurality of recesses are formed” means that a plurality of recesses are formed for one lead-in line.

  When the recesses are formed so as to face each other across the lead-in line, depending on the depth of the recess from the outer surface of the crush sealing part, a thin part with a small thickness is formed in the crush sealing part. If a thin portion is formed in the crushing sealing portion, there is a possibility that a crack or the like may occur in the thin portion when an impact or the like is applied to the arc tube. In addition, even during normal lighting, the thin-walled portion is likely to melt, so that the concave portion may melt and expand to reach the lead-in line. Therefore, the plurality of recesses are formed so as not to face each other across the lead-in line.

  According to the present invention, among the plurality of recesses, the recesses formed at the high temperature portion of the crushing sealing portion melt and expand earlier than the other recesses to reach the lead-in line. Since any one of the plurality of recesses is made to reach the lead-in line quickly, the abnormal lighting of the fluorescent lamp can be rapidly turned off.

  The invention of the lighting fixture according to claim 4 includes the fluorescent lamp according to any one of claims 1 to 3; a lighting device for lighting the fluorescent lamp; a fixture main body provided with the fluorescent lamp and the lighting device; It is characterized by comprising;

  According to the present invention, since the fluorescent lamp according to any one of claims 1 to 3 is provided, there is provided a lighting apparatus capable of quickly turning off the abnormal lighting of the fluorescent lamp with the fluorescent lamp itself.

  According to the first aspect of the present invention, the abnormal lighting is immediately extinguished by the fluorescent lamp itself by melting and expanding quickly when the concave portion is abnormally illuminated and reaching the introduction line. It is possible to prevent thermal damage to the base, socket, etc. due to abnormal heat generation due to. Thereby, the marketability and reliability of the fluorescent lamp can be improved. Further, since the concave portion is formed, for example, by pressing with a pincher so as to face a part of the outer surface of the crushing sealing portion, the arc tube can be prevented from being undesirably damaged, and the arc tube can be It can be manufactured at low cost.

  According to the invention of claim 2, since the recess is formed so that the minimum thickness up to the lead-in line is 0.3 to 1.5 mm, the fluorescent lamp can be manufactured at low cost, and the fluorescent lamp Can be turned off immediately.

  According to the invention of claim 3, since the plurality of recesses are formed so as not to oppose each other across the lead-in line, even if the plurality of recesses are formed, the crushing sealing portion is While being able to prevent destruction, it is possible to quickly turn off the abnormal lighting of the fluorescent lamp by quickly reaching one of the plurality of recesses to the introduction line.

  According to the invention of claim 4, since the fluorescent lamp according to any one of claims 1 to 3 is provided, the fluorescent lamp itself can turn off abnormal lighting of the fluorescent lamp at an early stage of abnormal lighting. An instrument can be provided.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First, a first embodiment of the present invention will be described.

  1 and 2 show a first embodiment of the present invention. FIG. 1 is a schematic front view of a partially cut-out side of the fluorescent lamp, and FIG. 2 is a partially cut-out side of the fluorescent lamp. It is a schematic side view.

  In FIG. 1, a fluorescent lamp 1 is formed having a pair of lead-in wires 2, 2, an arc tube 3, a phosphor film 4, and a discharge medium (not shown).

  The pair of lead-in wires 2 and 2 are each composed of an inner wire 5, an outer wire 6 and a dumet wire 7. The inner wire 5 and the outer wire 6 are connected to both ends of the dumet wire 7. The inner wires 5 and 5 support the both ends of the filament 8 by sandwiching them, for example.

For example, the dumet wire 7 is formed by sequentially plating an outer surface of an iron (Fe) -nickel (Ni) wire with copper (Cu) and copper oxide (CuO), and further borax (Na ₂ [B ₄ O ₅ (OH)). ₄ ] · 8H ₂ O), and the outer diameter is 0.4 to 0.5 mm. The inner wire 5 is made of, for example, an iron-nickel wire having an outer diameter of 0.6 mm, and the outer wire is made of, for example, a copper wire having an outer diameter of 0.6 mm.

  The arc tube 3 has a flare stem 10 sealed at both ends 9a, 9a (only one end 9a is shown in the figure) of the glass bulb 9. The glass bulb 9 is made of, for example, soda lime glass having a tube outer diameter of 12 to 20 mm and a wall thickness of 0.8 to 1.5 mm, and is formed in a desired shape such as a straight tube shape, a ring shape, or a bent shape. The flare stem 10 is made of, for example, soda lime glass and is formed by being pressed from both sides by a pincher, and a flare portion that is conically expanded on the opening (end face) side of the glass bulb 9. 12 and a narrow tube (exhaust tube) 13 is sealed. The thin tube 13 is made of, for example, lead glass, communicates with the glass bulb 9 through the opening 14, and one end 13 a is chipped off after exhausting the inside of the glass bulb 9.

  The crushing sealing portion 11 is sealed with a pair of lead-in wires 2 and 2 so as to seal the entire jumet wire 7. Thereby, the filament 8 is arrange | positioned by a pair of inner wires 5 and 5 inside the both ends 9a and 9a side of the glass bulb 9 (the arc tube 3), respectively, and both ends 9a and the glass bulb 9 (the arc tube 3) are arranged. Outer wires 6 and 6 of a pair of lead-in wires 2 and 2 are led out from 9a. A discharge path is formed between the filaments 8 and 8 in the glass bulb 9. The outer wires 6 and 6 are electrically connected to connection pins of a base (not shown) disposed at the end 9a of the glass bulb 9, respectively.

  The crushing sealing portion 11 is formed with substantially columnar concave portions 15 and 15 that are recessed toward the jumet line 7 in a part of one planar outer surface 11a formed by being pressed by the pincher. The recesses 15 and 15 are formed so as to face the jumet lines 7 and 7, and as shown in FIG. 2, the minimum thickness D1 to the jumet lines 7 is 0.3 to 1.5 mm, for example, 1.0 mm. Is formed. The concave portion 15 is formed at the same time as the crushing sealing portion 11 is formed, for example, and is formed by pressing a pincher having a protrusion on one side against the outer surface 11a.

  The dumet wire 7 is in good contact with the glass at the crushing sealing portion 11 by forming borax on the outside. Thereby, even if the recessed part 15 is formed in the outer surface 11a of the crushing sealing part 11 so that it may oppose the dumet line 7, the sealing of the jumet line 7 (introduction line 2) in the crushing sealing part 11 is maintained without trouble. Is done.

As shown in FIG. 1, for example, a three-wavelength light emitting phosphor film 4 is formed on the inner surface of the glass bulb 9. Here, the phosphor film 4 may be formed on a protective film made of alumina (Al ₂ O ₃ ) fine particles formed on the inner surface of the glass bulb 9. The glass bulb 9 is sealed with a rare gas such as mercury and argon (Ar), krypton (Kr), neon (Ne), and xenon (Xe) as a discharge medium.

  Next, the operation of the first embodiment of the present invention will be described.

  In the fluorescent lamp 1, when the electron emitting material of one filament 8 is consumed due to high-frequency lighting for a long time, a hot spot is generated in the filament 8, a half-wave discharge state occurs, and the filament 8 generates abnormal heat. Further, when the filament 8 is melted by the abnormal heat generation, the half-wave discharge is transferred from the filament 8 to the inner wire 5 of the lead wire 2, and the inner wire 5 is abnormally heated.

  If the filament 8 or the inner wire 5 is abnormally heated, the heat causes the temperature of the crushing sealing portion 11 to rapidly increase, and the temperature becomes about 500 ° C., for example. And the outer surface of the crushing sealing part 11 (recessed part 15) melt | dissolves gradually, and the depth of the recessed parts 15 and 15 becomes large in connection with this.

  The recess 15 faces the jumet line 7 of the lead-in line 2 and is formed so that the minimum distance D1 to the dumet line 7 is 0.3 to 1.5 mm, for example 1.0 mm. When it melts, it immediately reaches the outer surface of the jumet wire 7. Then, in the said reach | attainment site | part, the temperature difference of the glass of the crushing sealing part 11 and the dumet wire 7 becomes large by abnormal heating, The sealing property of glass and the dumet wire 7 is impaired, and the crushing sealing part 11 of A gap is formed between the glass and the dumet wire 7.

  Since the crushing sealing part 11 is continuously heated by the abnormal heat generation of the filament 8 and the inner wire 5, the gap is reached by the temperature difference between the glass of the crushing sealing part 11 and the jumet wire 7. It expands along the jumet line 7 (introduction line 2) from the site. The gap reaches the sealing end of the crushing sealing portion 11 inside the glass bulb 9 and the sealing end of the flare portion 12 of the flare stem 10 and vents the atmosphere and the inside of the arc tube 3. Thereby, the inside of the arc tube 3 is vented to the atmosphere, and abnormal discharge of the fluorescent lamp 1 is stopped. That is, the fluorescent lamp 1 is turned off.

  As described above, the concave portion 15 is formed so that the minimum distance D1 to the jumet line 7 is 0.3 to 1.5 mm, for example, 1.0 mm. 7 (introduction wire 2) is melted to the outer surface, and a gap is formed between the glass of the crushing sealing portion 11 and the dumet wire 7 so that the inside of the arc tube 3 can be vented to the atmosphere. Therefore, even when the fluorescent lamp 1 is abnormally lit at the end of its life, the fluorescent lamp 1 itself becomes inconspicuous, and it is possible to prevent the resin material such as the base and the socket from being thermally damaged.

  And since the recessed part 15 is formed so that the dumet line 7 may be opposed, and also the minimum distance D1 to the dumet line 7 may be 0.3-1.5 mm, A thin part is not formed. Thereby, even if an impact etc. are added to the arc_tube | light_emitting_tube 3, destruction of the crushing sealing part 11 can be prevented.

  The concave portion 15 forms, for example, the crushing sealing portion 11 and at the same time forms a substantially columnar pincher having a protrusion on one side so that the minimum distance D1 is 0.3 to 1.5 mm. Since it is formed by pressing on the outer surface 11a, it can be formed easily. As a result, the fluorescent lamp 1 can be manufactured at low cost.

  Next, a second embodiment of the present invention will be described.

  FIG. 3 is a partially cutaway schematic side view on the end side of the fluorescent lamp showing the second embodiment of the present invention. The same parts as those in FIG. 1 and FIG.

  The fluorescent lamp 16 shown in FIG. 3 is different from the fluorescent lamp 1 shown in FIG. 2 on each of the flat outer surfaces 11a and 11b of the crushing sealing portion 11 with respect to each of the pair of jumet wires 7 and 7, respectively. Recesses 15 and 15 are formed. And the recessed parts 15 and 15 are formed so that it may not mutually oppose on both sides of the dumet wires 7 and 7. FIG.

  By forming the recesses 15 and 15 so as not to face each other across the dumet wires 7 and 7, it is possible to prevent a thin portion from being formed between the outer surfaces 11 a and 11 b of the crushing sealing portion 11. Thereby, even if an impact etc. are added to the arc_tube | light_emitting_tube 3, destruction of the crushing sealing part 11 can be prevented.

  When the fluorescent lamp 16 is abnormally lit, the crushing sealing portion 11 is heated by the abnormal heat generation of the filament 8 and the inner wire 5 of the lead-in wire 2, and the temperature of the crushing sealing portion 11 rises. And the recessed part 15 currently formed in the high temperature site | part of the crushing sealing part 11 among several recessed parts 15 and 15 fuse | melts earlier than the other recessed part 15, and a magnitude | size and depth expand, and the jumet line 7 To reach. As a result, a gap is quickly generated between the glass of the crushing sealing portion 11 and the dumet wire 7, and the inside of the arc tube 3 is vented to the atmosphere.

  Thus, the abnormal lighting of the fluorescent lamp 16 is quickly turned off. Accordingly, the fluorescent lamp 16 itself can further prevent the resin material such as the base and the socket from being thermally damaged.

  Next, a third embodiment of the present invention will be described.

  FIG. 4 is a schematic external view of a luminaire showing a third embodiment of the present invention. Note that the same parts as those in FIG.

  The lighting fixture 17 shown in FIG. 4 is a direct-mounted lighting fixture installed on a construction such as a ceiling, and a lighting fixture body 18 is attached to the construction. The lighting fixture body 18 is provided with a cover 19 having a reflective surface 19a, and a pair of lamp sockets 20 and 20 are provided at both ends thereof. Further, the lighting fixture body 18 has a discharge lamp lighting device 21 as a lighting device disposed in a cover 19. The discharge lamp lighting device 21 lights the fluorescent lamp 1 at a high frequency. The fluorescent lamp 1 is mounted on the lamp sockets 20 and 20.

  When the fluorescent lamp 1 is abnormally lit, the lighting fixture 17 turns off the fluorescent lamp 1 by itself and at an early stage of abnormal lighting. Therefore, by providing the fluorescent lamp 1, it is possible to provide the lighting fixture 17 that is improved in reliability and marketability.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway schematic front view on an end side of a fluorescent lamp showing a first embodiment of the present invention. Similarly, the partially cutaway schematic side view on the end side of the fluorescent lamp. The partial notch schematic side view in the edge part side of the fluorescent lamp which shows the 2nd Embodiment of this invention. The schematic external view of the lighting fixture which shows the 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,16 ... Fluorescent lamp 2 ... Lead-in line 3 ... Light-emitting tube 4 ... Phosphor film 17 ... Lighting fixture 18 ... Appliance main body 21 ... Lighting device for discharge lamp as lighting device

Claims (4)

A pair of lead wires supporting both ends of the filament;
Each of the crushing sealing portions has a crushing sealing portion in which the pair of introduction lines are sealed at both ends, the pair of introduction lines are led out from the both end portions, and are opposed to the introduction lines. An arc tube made of glass having a recess recessed toward the lead-in line on a portion of the outer surface of the tube;
A phosphor film formed on the inner surface of the arc tube;
A discharge medium sealed inside the arc tube;
A fluorescent lamp characterized by comprising:   2. The fluorescent lamp according to claim 1, wherein the concave portion is formed so that a minimum wall thickness up to the lead-in line is 0.3 to 1.5 mm.   3. The fluorescent lamp according to claim 1, wherein a plurality of recesses are formed so as not to face each other across the lead-in wire. A fluorescent lamp according to any one of claims 1 to 3;
A lighting device for lighting the fluorescent lamp;
An instrument body having a fluorescent lamp and a lighting device;
The lighting fixture characterized by comprising.

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