JP2008181780A - Fluorescent lamp and lighting fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluorescent lamp enabled to easily manufacture and capable of preventing defects by abnormal discharge at the end of life in an early stage without giving bad influence to a normal discharge condition, and a lighting fixture with above the fluorescent lamp. <P>SOLUTION: The fluorescent lamp 1 is provided with a pair of lead-in wires 2, 2 supporting both end sides of a filament 9, a glass bulb 3 mutually having squeezed seal parts 11, 11 with a pair of lead-in wires 2, 2 sealed at both end parts 3a, 3a, a narrow tube 4 made of a glass of which one end side 4a is sealed and protruded from the squeeze seal part 11 to inside the glass bulb 3 as well as the other end side 4b is welded to the squeeze seal part 11 between the pair of lead-in wires 2, 2, and with impurity gas or impurity gas discharge substance 12 sealed inside, a phosphor film 5 formed on an inner face side of the glass bulb 3, and a discharge media sealed inside the glass bulb 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. In this direct current lighting state, for example, electrons enter and exit the electrode from a part of the filament, and the temperature of the electrode 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 fluorescent lamp including a glass bead that emits an impure gas disposed on at least one of a pair of inner lead wires has been proposed (see Patent Document 1). This prior art fluorescent lamp is made of a glass material whose glass bead has a softening point lower than the softening point of the flare stem and releases a large amount of impure gas such as hydrogen and carbon dioxide into the glass bulb when softened and melted. ing. And the density | concentration of the impure gas in a glass bulb | bulb becomes high, and when a lamp voltage rises, it becomes impossible to maintain a discharge state and it extinguishes.

  Further, there has been proposed a fluorescent lamp that contains an impure gas releasing substance and includes a gas releasing base disposed on at least one inner lead (see Patent Document 2). In this prior art fluorescent lamp, since the impure gas is released from the impure gas discharge material contained in the gas discharge base at the end of the lamp life, the lighting sustaining voltage is higher than the lamp voltage supplied by the lighting circuit. The light is turned off.

  In addition, a fluorescent lamp has been proposed in which the thickness of a portion of the glass forming the flare stem is reduced, the thin portion is destroyed when the abnormal temperature rises, and the abnormal discharge is stopped by flowing air into the glass bulb (patent) Reference 3). In this conventional fluorescent lamp, a thin portion is formed at the sealing portion of the proximal end of the thin tube to the crush sealing portion. The thin-walled portion softens due to abnormal temperature and breaks down due to the pressure difference between the inside and outside, so that the air flows from the narrow tube into the glass bulb, and the fluorescent lamp cannot maintain the discharge state and is extinguished.

In addition, a rough texture that is structurally weaker than the rest of the glass bulb is formed over the majority of the pinched sealing region of the glass bulb, and when a temperature state higher than a predetermined level occurs, the rough texture A fluorescent lamp that is broken and extinguishes has been proposed (see Patent Document 4). In this prior art fluorescent lamp, the rough texture is formed by grit blasting using non-silica grit, the breakage starts from the outside of the pinch sealed area and goes inward, and the inside of the glass bulb is exposed to the outside air By leaking, the discharge state cannot be maintained and the light is turned off.
Japanese Patent Laying-Open No. 2005-302386 (5th page, FIG. 2) JP 2001-101998 A (page 5, FIG. 1) Japanese Patent Laid-Open No. 10-31975 (page 5, FIG. 4) Japanese Patent Laid-Open No. 7-153425 (page 3, FIG. 1)

  In the fluorescent lamp of Patent Document 1, even if the glass bead does not soften and melt, that is, even in a normal lighting state, a minute amount of impure gas may be generated from the glass bead. As the cumulative lighting time elapses, there is a problem that the concentration of impure gas increases and the lamp voltage increases.

  The fluorescent lamp of Patent Document 2 has the disadvantages that it requires labor for manufacturing and is expensive because the gas releasing substrate is fixed to the lead wire. In addition, the fluorescent lamp of Patent Document 3 has a drawback in that since the base end of the thin tube is formed in the thin portion of the flare stem, an advanced manufacturing process is required and the manufacturing becomes complicated.

  In the fluorescent lamp of Patent Document 4, since a rough texture is formed in the pinch sealing region, the progress of breakage after an abnormal discharge occurs is slow, and it takes time until the inside of the glass bulb leaks to the outside air. Until then, there is a drawback that the resin material such as the base and the socket may be thermally damaged.

  The present invention provides a fluorescent lamp that can be easily manufactured and can prevent a malfunction due to abnormal discharge at the end of its life at an early stage without adversely affecting a normal discharge state, and a lighting fixture provided with the fluorescent lamp. With the goal.

  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. A glass bulb in which the pair of lead-in wires are respectively led out from a portion; between the pair of lead-in wires, one end side is sealed and protrudes into the glass bulb from the crush-sealed portion, and the other end side is the crush-sealed A thin tube made of glass that is welded to the inside and in which an impure gas or an impure gas releasing substance is sealed; a phosphor film formed on the inner surface side of the glass bulb; a discharge sealed in the glass bulb And a medium.

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

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

  A crushing sealing part is formed by crushing the edge part of a glass bulb with a pincher.

  The impure gas is a gas (gas) that increases the lamp voltage in the glass bulb, and can be, for example, air, hydrogen, carbon dioxide, nitrogen dioxide, or the like. Further, the impure gas releasing substance is a substance that releases an impure gas when heated, and may be, for example, a plastic material or a glass material.

  The discharge medium can be a combination of mercury and a noble gas. What is necessary is just to set the kind of rare gas, and enclosure pressure suitably. In addition, mercury can be encapsulated in the form of amalgam or zinc mercury pellets in addition to encapsulating mercury with a liquid.

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

  According to the present invention, when abnormal discharge occurs in the filament or the pair of lead wires at the end of the life and the portion abnormally generates heat, the thin tube located between the pair of lead wires is heated by the heat, and the temperature of the thin tube is increased. Rises rapidly. As the internal gas expands, the thin tube is distorted due to a temperature difference, and cracks are generated. Then, the impure gas released from the impure gas releasing material sealed in the narrow tube is diffused into the glass bulb. In the glass bulb, the lamp voltage rises, the abnormal discharge cannot be maintained in the filament or the pair of lead wires, and the abnormal discharge stops.

  The invention of the fluorescent lamp according to claim 2 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. A glass bulb from which the pair of lead-in wires are respectively led out from a portion; between the pair of lead-in wires, one end side is sealed and protrudes into the glass bulb from the crushing sealing portion, and the other end side is opened A thin tube made of glass positioned on the outer surface side of the crushing sealing portion and sealed to the crushing sealing portion so that one end side and the other end side communicate with each other; and a phosphor film formed on the inner surface side of the glass bulb And a discharge medium enclosed in a glass bulb.

  The pincher that crushes the end portion of the glass bulb is provided with a concave groove into which the other end of the thin tube can be inserted.

  “The other end of the thin tube is positioned on the outer surface side of the crushing sealing portion” means that the opening on the other end side of the thin tube may be exposed on the outer surface of the crushing sealing portion, and the other end side of the thin tube is crushing sealed. It means that it may protrude outward from the outer surface of the stop.

  The other end of the capillary tube may be crushed and deformed as long as it communicates with the one end. Moreover, you may insert a metal wire, a ceramic fiber, etc. in a thin tube so that the opening which connected may not be crushed at the time of manufacture.

  According to the present invention, when abnormal discharge occurs in the filament or the pair of lead wires at the end of the life and the portion abnormally generates heat, the other end of the thin tube located between the pair of lead wires is heated by the heat, The temperature at the other end of the capillary tube increases rapidly. The thin tube is distorted by a sudden temperature difference generated in the heating portion on the other end side, and cracks (cracks) are generated. Then, air flows into the glass bulb from the other end of the thin tube. As a result, the abnormal discharge cannot be maintained in the filament or the pair of lead wires, and the abnormal discharge is stopped.

  According to a third aspect of the present invention, there is provided the fluorescent lamp according to the first or second aspect, wherein the glass bulb is provided with a glass bead that spans a pair of lead-in wires, and one end of the thin tube is the glass. It is characterized by being close to or in contact with the bead.

  According to the present invention, when abnormal discharge occurs in the filament or the pair of lead wires at the end of the life and the portion abnormally generates heat, the glass beads near the filament or lead wires are heated by the heat, and the temperature of the glass beads is increased. It rises rapidly and the glass bead melts. And the temperature of the one end side of the thin tube which adjoins or contacts the glass bead rises rapidly. The thin tube is broken by gradually melting the outer surface on one end side. Thereby, impure gas or air diffuses in the glass bulb, and abnormal discharge cannot be maintained in the filament or the pair of lead wires, and abnormal discharge stops.

  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 fixture capable of stopping abnormal lighting of the fluorescent lamp at an early stage with the fluorescent lamp itself.

  According to the first aspect of the present invention, when an abnormal discharge occurs in the filament or the pair of lead wires, the thin tube is cracked immediately, and impure gas is released from the thin tube into the glass bulb, and the abnormal discharge stops at an early stage. In addition, it is possible to suppress thermal damage of the base disposed on both ends of the glass bulb and the socket to which the base is mounted as much as possible. In addition, the narrow tube in which the impure gas or the impure gas releasing substance is sealed is easily manufactured because the other end is welded to the crushing sealing portion and disposed between the pair of lead wires in the glass bulb. Thus, the fluorescent lamp can be made inexpensive, and the normal lighting state can be prevented from being adversely affected.

  According to the invention of claim 2, when an abnormal discharge occurs in the filament or the pair of lead wires, the other end side of the thin tube is cracked immediately, and air flows into the glass bulb from the other end side, so that the abnormal discharge is an early stage. Therefore, it is possible to suppress thermal damage to the caps disposed on both ends of the glass bulb and the sockets to which the caps are mounted as much as possible. Further, the narrow tube is sealed to the crushing sealing portion so that one end side is located between the pair of lead wires in the glass bulb and the other end side is in communication with the one end side and located on the outer surface side of the crushing sealing portion. Therefore, the fluorescent lamp can be easily manufactured, the cost of the fluorescent lamp can be reduced, and the normal lighting state can be prevented from being adversely affected.

  According to the invention of claim 3, since the narrow tube is disposed so that one end side is close to or in contact with the glass bead close to the filament or the pair of lead wires, abnormal discharge occurs in the filament or the pair of lead wires. Sometimes, at an earlier stage, one end side of the narrow tube can be melted and broken to stop abnormal discharge.

  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 stop the 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 partially cutaway schematic front view on the end side of a fluorescent lamp, and FIG. It is a part notch schematic front view.

  In FIG. 1, a fluorescent lamp 1 is formed having a pair of lead-in wires 2, 2, a glass bulb 3, a thin tube 4, a phosphor film 5, and a discharge medium (not shown).

The pair of lead-in wires 2 and 2 are each composed of an inner wire 6, an outer wire 7 and a jumet wire 8. The inner wire 6 and the outer wire 7 are connected to both ends of the jumet wire 8. For example, the jumet wire 8 is formed by sequentially plating copper (Cu) and copper oxide (CuO) on the outer surface of an iron (Fe) -nickel (Ni) wire, 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 6 is made of, for example, an iron-nickel wire having an outer diameter of 0.6 mm, and the outer wire 7 is made of, for example, a copper wire having an outer diameter of 0.6 mm.

  The inner wires 6 and 6 support the both ends of the filament 9 by sandwiching them, for example. The filament 9 is made of a tungsten (W) wire and is formed of a double coil or a triple coil. Further, a glass bead 10 formed in a substantially rectangular parallelepiped is stretched around the inner wires 6 and 6. The glass bead 10 is made of soft glass such as lead glass, soda lime glass, or barium silicate glass, and heats and melts one surface of each of the two plate-shaped glass materials so as to sandwich the inner wires 6 and 6. Is formed.

  The glass bulb 3 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 into a desired shape such as a straight tube shape, a ring shape, or a bent shape, and both end portions 3a, A pair of lead-in wires 2 and 2 are crushed and sealed at 3a (only one end 3a is shown in the figure). The sealing portion is a substantially plate-like crushing sealing portion 11. That is, the pair of lead-in wires 2 and 2 are sealed in the crushing sealing portion 11 so as to seal the entire jumet wire 8. Thereby, the filament 9 is arrange | positioned by a pair of inner wires 6 and 6 inside the both ends 3a and 3a side of the glass bulb 3, respectively, and a pair of lead-in wires 2 and 2 are provided from both ends 3a and 3a of the glass bulb 3, respectively. Outer wires 7 and 7 are derived. A discharge path is formed between the filaments 9 in the glass bulb 3. The outer wires 7 and 7 are electrically connected to connection pins of a base (not shown) disposed at both ends 3a and 3a of the glass bulb 3, respectively.

  The thin tube 4 is made of, for example, soda lime glass having a tube outer diameter of 3 to 5 mm and a wall thickness of 0.3 to 0.8 mm, and between the pair of inner wires 6 and 6 (introduction wires 2 and 2) in the glass bulb 3. The crushing sealing portion 11 is provided so as to protrude into the glass bulb 3. The thin tube 4 has a glass tube in which one end side 4a is sealed and the other end side 4b is closed, and an impure gas releasing substance 12 is sealed inside the one end side 4a. It is formed by crushing the end 3a. Thereby, the one end side 4a of the thin tube 4 protrudes from the crushing sealing portion 11 into the glass bulb 3, and the other end side 4b is welded to and supported by the crushing sealing portion 11. Further, the one end side 4 a is separated from the glass bead 10 spanned between the pair of inner wires 6 and 6.

The impure gas releasing substance 12 is a bead made of a glass material that emits an impure gas such as carbon dioxide (CO ₂ ) or nitric oxide (NO). The impure gas releasing material 12 is heated through the thin tube 4, thereby releasing the impure gas into the thin tube 4. The narrow tube 4 may be filled with an impure gas instead of the impure gas releasing material 12. In this case, the glass tube in which the impure gas is supplied is crushed to the end portion 3 a of the glass bulb 3 together with the pair of introduction wires 2 and 2.

On the inner surface of the glass bulb 3, for example, a three-wavelength phosphor type phosphor film 5 is formed. Here, the phosphor film 5 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 3. Further, inside the glass bulb 3, rare gases such as mercury and argon (Ar), krypton (Kr), neon (Ne), xenon (Xe), etc. are enclosed as a discharge medium, either alone or mixed.

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

  When a high frequency voltage is applied to the pair of lead-in wires 2 and 2 sealed in the crushing sealing portions 11 and 11 at both ends 3a and 3a, the fluorescent lamp 1 discharges between the pair of filaments 9 and 9, respectively. Is generated, and visible light is emitted from the phosphor film 5. In this normal lighting state, the glass bead 10 is not abnormally heated by the heat from the filament 9, and the thin tube 4 is not abnormally heated. That is, even if the impure gas releasing substance 12 is enclosed in the narrow tube 4, it does not adversely affect the normal lighting state.

  In the fluorescent lamp 1, when the electron emitting material of one filament 9 is consumed due to high-frequency lighting for a long time, a hot spot is generated in the filament 9 and a half-wave discharge state occurs, and the filament 9 generates abnormal heat. Further, when the filament 9 is melted by the abnormal heat generation, the half-wave discharge is transferred from the filament 9 to the support portion 6a of the glass bead 10 of the inner wire 6, and the portion of the inner wire 6 is abnormally heated. Thereafter, the half-wave discharge shifts to the crushing sealing portion side 6b of the inner wire 6, and the crushing sealing portion side 6b generates heat. Due to this heat generation, the thin tube 4 is heated, and the temperature of the other end 4b of the thin tube 4 rises rapidly, and the temperature becomes about 500 ° C., for example. Then, the outer surface of the other end 4b of the thin tube 4 is gradually melted, and the impure gas is gradually released from the impure gas releasing material 12, and the impure gas filling pressure in the thin tube 4 is increased. Then, due to the temperature difference between the other end 4b of the thin tube 4 and its surroundings, the other end 4b of the thin tube 4 is distorted, cracked, and cracks 13 are formed as shown in FIG. The impure gas in the narrow tube 4 is released from the crack 13 into the glass bulb 3 and diffuses.

  As impure gas diffuses into the glass bulb 3, the lamp voltage between the pair of filaments 9, 9 increases, so that the half-wave discharge state cannot be maintained, and half-wave discharge stops. That is, the fluorescent lamp 1 is turned off.

  Thus, when half-wave discharge occurs in the filament 9 or the inner wire 6 and abnormal heat is generated, the thin tube 4 is immediately cracked to form a crack 13, and the impure gas released from the impure gas releasing material 12 is discharged from the thin tube 4 to the glass bulb 3. As it diffuses in, the half-wave discharge (abnormal discharge) stops at an early stage. Thereby, the thermal damage to the resin material of the nozzle | cap | die arrange | positioned at the both ends 3a and 3a side of the glass bulb | bulb 3 or the socket with which this nozzle | cap | die was mounted can be suppressed as much as possible.

  Further, the narrow tube 4 can be formed by crushing and sealing a glass tube in which an impure gas releasing substance 12 is sealed at one end side 4a sealed together with a pair of lead wires 2 and 2 at an end portion 3a of the glass bulb 3. Therefore, the fluorescent lamp 1 can be easily manufactured. As a result, the fluorescent lamp 1 can be manufactured at low cost.

  The fluorescent lamp 1 is configured to have a glass bead 10 between the inner wires 6 and 6, but even if the glass bead 10 is not provided, the thin tube is caused by abnormal heating of the filament 9 or the inner wire 6. The other end side 4b of 4 cracks and the crack 13 enters.

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

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

  A fluorescent lamp 14 shown in FIG. 3 is obtained by providing a thin tube 15 between a pair of lead-in lines 2 and 2 in place of the thin tube 4 in the fluorescent lamp 1 shown in FIG. The thin tube 15 is made of, for example, soda lime glass having a tube outer diameter of 3 to 5 mm and a wall thickness of 0.3 to 0.8 mm, and a pair of glass tubes in which one end side 15a is sealed and the other end side 15b is opened. When the wires 2 and 2 are crushed and sealed to the end portion 3a of the glass bulb 3, they are formed by sealing the crushing and sealing portion 11 so that the one end side 15a and the other end side 15b communicate with each other. The pincher that crushes the end portion 3a of the glass bulb 3 is formed in a planar shape in a portion facing the pair of lead-in wires 2 and 2, and a portion facing the other end side 15b of the thin tube 15 It is formed in an insertable groove.

  That is, one end side 15 a of the thin tube 15 protrudes from the crushing sealing portion 11 into the glass bulb 3, and the other end side 15 b is sealed to the crushing sealing portion 11, and its opening 16 is the crushing sealing portion 11. The outer surface 11a is cut so as to protrude somewhat from the outer surface 11a. In addition, you may insert metal wires, ceramic fiber, etc. in the thin tube 15 so that the opening 16 of the thin tube 15 may not be crushed at the time of manufacture. Further, the one end side 15 a is separated from the glass bead 10 spanned between the pair of inner wires 6 and 6.

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

  When the fluorescent lamp 14 reaches the end of its life, it enters a half-wave discharge state, and the filament 9 generates abnormal heat. Further, when the filament 9 is melted by the abnormal heat generation, the half-wave discharge is transferred from the filament 9 to the support portion 6a of the glass bead 10 of the inner wire 6, and the portion of the inner wire 6 is abnormally heated. Thereafter, the half-wave discharge shifts to the crushing sealing portion side 6b of the inner wire 6, and the crushing sealing portion side 6b generates heat. The other end 15b of the thin tube 15 is heated by the heat generation on the crushing and sealing portion side 6b, the temperature of the other end 15b is rapidly increased, and the outer surface of the thin tube 15 is gradually melted.

  When the abnormal heat generation of the inner wire 6 is continued, the thin tube 15 is heated at the other end 15b by the discharge by the discharge on the crushing sealing portion side 6b of the inner wire 6, and the distortion occurs due to the temperature difference around it. As shown in FIG. 2, the crack 13 is cracked.

  When the crack 13 enters the other end side 15 b of the thin tube 15, air flows into the glass bulb 3 from the crack 13 because the opening 16 on the other end side 15 b communicates with the atmosphere. As a result, the half-wave discharge cannot be maintained in the filament 9 or the inner wire 6 and the half-wave discharge is stopped. That is, the fluorescent lamp 14 is turned off.

  Thus, when half-wave discharge occurs in the filament 9 or the inner wire 6 and abnormal heat is generated, the other end 15b of the thin tube 15 is cracked immediately to form a crack 13 from which air flows into the glass bulb 3. Therefore, half-wave discharge (abnormal discharge) stops at an early stage. Thereby, the thermal damage to the resin material of the nozzle | cap | die arrange | positioned at the both ends 3a and 3a side of the glass bulb | bulb 3 or the socket with which this nozzle | cap | die was mounted can be suppressed as much as possible.

  The narrow tube 15 has one end side when the pair of lead-in wires 2 and 2 are crushed and sealed to the end portion 3a of the glass bulb 3 with the one end side 15a sealed and the other end side 15b opened. 15a and the other end side 15b communicate with each other, and the other end side 15b is positioned on the outer surface 11a side of the crushing sealing portion 11 so that the other end side 15b is sealed to the crushing sealing portion 11 so that it is formed. As a result, the fluorescent lamp 14 can be manufactured at low cost.

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

  4 and 5 show a third embodiment of the present invention, in which FIG. 4 is a partially cutaway schematic front view on the end side of a fluorescent lamp, and FIG. 5 is a part on the end side of another fluorescent lamp. It is a notch schematic front view. The same parts as those in FIG. 1 and FIG.

  The fluorescent lamp 17 shown in FIG. 4 is a fluorescent lamp 1 shown in FIG. 1 that protrudes from the crushing sealing portion 11 into the glass bulb 3 so that one end side 4a of the thin tube 4 contacts the glass bead 10. . Further, the fluorescent lamp 18 shown in FIG. 5 is the same as the fluorescent lamp 14 shown in FIG. 3, but protrudes from the crushing sealing portion 11 into the glass bulb 3 so that one end side 15 a of the thin tube 15 contacts the glass bead 10. It is.

  In the fluorescent lamp 17, when the half-wave discharge (abnormal discharge) occurs in the filament 9 or the inner wire 6 at the end of the life and the filament 9 or the inner wire 6 generates abnormal heat, the glass bead 10 is heated by the heat generated by the abnormal heat generation. The temperature of the glass bead 10 increases rapidly. And since the one end side 4a of the thin tube 4 is contacting the glass bead 10, heat is transferred from the glass bead 10 and temperature rises rapidly with the rapid temperature rise of the glass bead 10. FIG. As a result, the impure gas is quickly released from the impure gas releasing substance 12 in the narrow tube 4, and the outer surface of the one end side 4a is rapidly melted and broken. Therefore, half-wave discharge stops at an earlier stage after half-wave discharge occurs, and thermal damage to the cap and socket of the fluorescent lamp 17 can be prevented.

  The fluorescent lamp 18 rapidly rises in temperature with a rapid rise in the temperature of the glass bead 10 because the one end 15a of the thin tube 15 is in contact with the glass bead 10. As a result, the outer surface of the one end side 15 a of the thin tube 15 is rapidly melted and broken, and air flows into the glass bulb 3. Therefore, half-wave discharge stops at an earlier stage after half-wave discharge occurs.

  The one end side 4a of the thin tube 4 and the one end side 15a of the thin tube 15 may be close to the glass bead 10, respectively. Even in this case, the one end side 4a of the thin tube 4 or the one end side 15a of the thin tube 15 is rapidly heated from the glass bead 10 as the temperature of the glass bead 10 rises.

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

  FIG. 6 is a partially cutaway schematic side view of a luminaire showing a fourth embodiment of the present invention. Note that the same parts as those in FIG.

  A lighting fixture 19 shown in FIG. 6 is a downlight embedded in a construction such as a ceiling (not shown), and includes a fixture main body 20, a fluorescent lamp 21, and a lighting device 22. The instrument body 20 has a top plate 23 on the upper surface side and a lamp socket 24 on the lower surface side. A lighting device 22 is disposed on the upper surface 23 a of the top plate 23. A fluorescent lamp 21 is attached to the lamp socket 24.

  The fluorescent lamp 21 is formed in the same manner as the fluorescent lamp 1 shown in FIG. 1 by connecting, for example, two U-shaped glass bulbs 25 with joints (not shown), and is attached to each end 25a. A base 26 having a connected pin is provided. A connection pin of the base 26 is inserted into the lamp socket 24.

  The lighting device 22 is configured to apply a high-frequency voltage to the connection pin of the base 26 via the lamp socket 24. Thereby, the fluorescent lamp 21 is lit at high frequency.

  The top plate 23 is attached with a pair of support fittings 27, 27 having a spring property. Then, a reflection mirror 28 formed in a substantially rectangular shape is attached to the support fittings 27 and 27 so as to cover the fluorescent lamp 21. A decorative frame 29 having a circular outer shape is disposed around the lower portion of the reflecting mirror 28.

  In addition, the fixture body 20 is provided with a connection fitting 30 from the top plate 23 to the decorative frame 29, and the attachment fitting 31 for fixing the appliance body 20 to a construction such as a ceiling is provided on the connection fitting 30. Yes.

  When the fluorescent lamp 21 is turned on, the radiated light from the fluorescent lamp 21 becomes direct light and reflected light reflected by the inner surface of the reflecting mirror 28, and is emitted from the opening 28 a of the reflecting mirror 28 to the external space. When the fluorescent lamp 21 is abnormally turned on such as half-wave discharge, the fluorescent lamp 21 is turned off at the early stage of the fluorescent lamp 21 itself and abnormal lighting. Therefore, it is possible to provide a lighting fixture 19 in which thermal damage to the cap 26 and the lamp socket 24 of the fluorescent lamp 21 is suppressed.

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 partial notch schematic front view in the edge part side of the lifetime end of a fluorescent lamp. The partial notch schematic front view in the edge part side of the fluorescent lamp which shows the 2nd Embodiment of this invention. The partial notch schematic front view in the edge part side of the fluorescent lamp which shows the 3rd Embodiment of this invention. Similarly, the partially notched schematic front view in the edge part side of another fluorescent lamp. The partial notch schematic side view of the lighting fixture which shows the 4th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,14,17,18,21 ... Fluorescent lamp 2 ... Lead-in line 3 ... Glass bulb 4,15 ... Thin tube 5 ... Phosphor film 19 ... Lighting fixture 20 ... Appliance main body 22 ... Lighting device

Claims (4)

A pair of lead wires supporting both ends of the filament;
A glass bulb having a crushing sealing portion in which the pair of introduction lines are sealed at both ends, and the pair of introduction lines are respectively led out from both ends;
Between the pair of lead-in wires, one end side is sealed, protrudes into the glass bulb from the crushing sealing portion, and the other end side is welded to the crushing sealing portion, and impure gas or impure gas is released inside. A tubule made of glass encapsulating a substance;
A phosphor film formed on the inner surface of the glass bulb;
A discharge medium enclosed in a glass bulb;
A fluorescent lamp characterized by comprising: A pair of lead wires supporting both ends of the filament;
A glass bulb having a crushing sealing portion in which the pair of introduction lines are sealed at both ends, and the pair of introduction lines are respectively led out from both ends;
Between the pair of lead-in wires, one end side is sealed and protrudes into the glass bulb from the crushing sealing portion, and the other end side is opened and is positioned on the outer surface side of the crushing sealing portion, one end side and the other A thin tube made of glass sealed on the crushing sealing part so that the end side communicates;
A phosphor film formed on the inner surface of the glass bulb;
A discharge medium enclosed in a glass bulb;
A fluorescent lamp characterized by comprising:   3. The fluorescent lamp according to claim 1, wherein a glass bead spanned between a pair of lead-in wires is provided in the glass bulb, and one end side of the thin tube is close to or in contact with the glass bead. 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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