JP2008204661A - Fluorescent lamp, and luminaire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluorescent lamp with a squeezed and sealed electrode, which can be easily manufactured and can prevent in an early stage the malfunction caused by abnormal discharge which occurs at the last stage of its lifetime. <P>SOLUTION: This fluorescent lamp 1 is equipped with a pair of lead-in wires 2, 2 supporting both end sides of a filament 8, a bulb 10 of glass which is crookedly bent so that end parts 10a, 10b are placed parallel with each other, and an arc tube 3 having a swelling part 13, which is formed so that it swells from the peripheral surface of the bulb, and its tip is positioned in the inside of a virtual tangent A touching the peripheral surfaces of the end parts 10a, 10b of an adjacent bulb 10, in the end part 10a of the bulb 10 where a pair of the lead-in wires 2, 2 are squeezed and sealed, and at least a part of the thickness D1 of which is thinner than the thickness of the bulb 10. <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, in the electrode on the consumption side of the electron emitting material, electrons concentrate in and out of a part of the filament, for example, and the temperature of the part rises abnormally. For this reason, problems such as melting of a resin member 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 has been proposed in which a thin glass portion is formed by reducing the thickness of a portion of the glass forming the flare stem (see Patent Document 1). In this conventional fluorescent lamp, near the head of the flare stem is abnormally overheated due to abnormal discharge at the end of life, and the glass of the thin glass portion of the flare stem is broken due to this abnormal overheating, from which air flows into the arc tube, The filament breaks, and the fluorescent lamp stops energizing.

By the way, in the fluorescent lamp in which the end portion of the glass bulb is crushed and sealed, forming a thin glass portion with high accuracy at the end portion requires an advanced manufacturing process and is complicated to manufacture. As a solution to this problem, for example, a rough texture that is structurally weaker than the rest of the glass bulb is formed over the majority of the pinched seal region of the glass bulb, and a temperature state higher than a predetermined level. There has been proposed a fluorescent lamp that is damaged by the rough texture and turns off when this occurs (see Patent Document 2). 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 Laid-Open No. 2003-331787 (page 3, FIG. 1) Japanese Patent Laid-Open No. 7-153425 (page 3, FIG. 1)

  In the fluorescent lamp of Patent Document 2, 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 resin members such as a base and a socket may be thermally damaged.

  An object of the present invention is to provide a fluorescent lamp in which an electrode that can be easily manufactured and can prevent a malfunction due to an abnormal discharge at the end of its life at an early stage, and a lighting fixture in which the fluorescent lamp is disposed. And

  The invention of the fluorescent lamp according to claim 1 includes a pair of lead wires supporting both ends of the filament; a bulb made of glass bent so that each end is parallel; and at least one of the bulbs The other valve end portions are sealed except for the crush sealing portion formed by crushing and sealing each of the pair of lead wires at the pair of end portions, and the valve end portion where the crush sealing portion is formed. A joint portion formed so that the end portions communicate with each other and the valves are connected to each other, an end portion of the valve in which the pair of introduction lines are crushed and sealed, and an outer peripheral surface of an end portion of an adjacent valve, respectively An arc tube having a bulging portion formed so as to bulge from the outer peripheral surface of the bulb so that the tip is located on the inner side of the tangential virtual tangent, and at least a portion of which is thinner than the thickness of the bulb And formed on the inner surface of the bulb of the arc tube Characterized in that it comprises a; has been a phosphor film; a discharge medium is sealed in the arc tube.

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

  Each valve includes a valve in which a plurality of valves are connected in addition to a single straight pipe-type valve bent into, for example, a U shape. For example, an H-shaped valve is also included in which the other end portions are sealed and communicated so that one end portions of two straight tube valves are parallel to each other. Each bulb is connected to form an arc tube.

  “Parallel” indicates not a mathematical parallel but a state in which each end of the valve is lined up. And the end surface of each edge part of a valve | bulb is not limited to being located in the same plane shape.

  Sealing of the valve end other than the valve end where the pair of lead-in wires is crushed and sealed may be performed by crushing, or may be performed by other sealing such as burnout or molding.

  The bulging portion can be formed by partially heating the outer peripheral surface of the valve in the vicinity of the crushing sealing portion and inflating with air blown into the valve when crushing and sealing. And it is so preferable that a bulging part is near the boundary of a crushing sealing part and the inside of a valve | bulb.

  In a fluorescent lamp having a flare stem at the bulb end, the vicinity of the head of the flare stem is abnormally overheated due to heat accompanying the abnormal discharge when the electrode is abnormally discharged. Here, since the bulging portion is formed on the sealing portion side where the flare stem at the valve end is sealed, even if the vicinity of the head of the flare stem is abnormally overheated, the bulging portion is unlikely to be abnormally overheated. . On the other hand, according to the present invention, the crushing sealing part in which the pair of lead wires are crush-sealed is abnormally overheated, and the bulging part located near the crushing sealing part is abnormally overheated. That is, the bulging portion is formed in the vicinity of the end portion of the valve where the pair of lead wires are crushed and sealed so that the temperature of the crushed and sealed portion is easily received.

  The term “adjacent valve end” means each end of the valves that are connected in parallel by the U-shaped or H-shaped valves and the valve connected by the joint. And “inside the virtual tangent” means the inner side of the connected valves.

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

  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 sealed in the form of amalgam in addition to liquid mercury.

  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 crushing sealing portion that crushes and seals the pair of lead wires is heated by the heat. As a result, the temperature of the crushing and sealing portion rapidly increases, and the crushing and sealing portion is abnormally overheated. Thereby, the bulging part located near the crushing and sealing part is heated by the heat from the crushing and sealing part, and becomes abnormally overheated, and the outer surface gradually melts. The wall thickness of the bulging part gradually decreases, and the thin part breaks due to the pressure difference between the inside and outside of the valve. Then, air flows into the valve from the broken part. In the bulb, the lamp voltage rises and abnormal discharge cannot be maintained in the filament or the pair of lead wires, and abnormal discharge stops.

  In addition, the bulging part is formed so that the tip is located inside the virtual tangent line that is in contact with the outer peripheral surface of the end part of the adjacent bulb. For example, when a base is provided at each end part of the bulb When handling fluorescent lamps, etc., it is difficult to hit interference.

  The fluorescent lamp according to a second aspect of the present invention is the fluorescent lamp according to the first aspect, wherein the bulb has a thickness of 0.7 to 2.0 mm, and the bulging portion has a thickness of a thin portion. The protrusion length from the outer peripheral surface of the valve is 0.28 to 0.4 mm, and is 1.5 to 4.0 mm.

  The wall thickness of 0.7 to 2.0 mm is a typical thickness of a glass bulb used in a fluorescent lamp. That is, when the wall thickness is less than 0.7 mm, for example, the bulb is easily broken when grasped by hand, and when the wall thickness exceeds 2.0 mm, the visible light transmittance decreases, Luminous efficiency is lowered due to difficulty in obtaining a luminous flux.

  If the thickness of the thin portion of the bulging portion is less than 0.28 mm, a crack may occur in the thin portion when an impact is applied to the fluorescent lamp, and from the filament or lead wire when the fluorescent lamp is normally lit. The thin-walled portion may melt and be broken by the heat. Further, if the thickness of the thin portion exceeds 0.4 mm, it takes time to melt the thin portion when abnormal discharge occurs, and the thin portion may not be broken at an early stage. Therefore, the thickness of the thin portion is 0.28 to 0.4 mm.

  If the protruding length of the bulging portion from the outer peripheral surface of the valve is less than 1.5 mm, it is difficult to form the thickness of the thin portion within the above numerical range. Further, when the protruding length exceeds 4.0 mm, for example, when the valves are connected to face each other, the bulging portion is likely to come into contact with the other valve, and the bulging portion becomes large. There is a possibility that the area on the outer peripheral surface of the valve becomes large, the bulging portion becomes conspicuous on the valve end side, and the design property is impaired. Therefore, the protrusion length is set to 1.5 to 4.0 mm.

  According to the present invention, since the bulging portion has a thickness of the thin portion of 0.28 to 0.4 mm and a protruding length from the outer peripheral surface of the bulb of 1.5 to 4.0 mm, abnormal discharge occurs in the fluorescent lamp. It is damaged at an early stage when this occurs, and is formed on the outer peripheral surface of the valve end with an appropriate size.

  The invention of a lighting fixture according to claim 3 comprises the fluorescent lamp according to claim 1 or 2; a lighting device for lighting the fluorescent lamp; and a fixture body in which the fluorescent lamp and the lighting device are disposed. It is characterized by that.

  According to the present invention, since the fluorescent lamp according to claim 1 or 2 is provided, there is provided a lighting apparatus 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 portion of the bulge portion is immediately broken, and air flows from the bulge portion into the bulb to stop the abnormal discharge. Therefore, at an early stage after the occurrence of the abnormal discharge, it is possible to suppress thermal damage as much as possible to the base disposed on each end side of the bulb and the socket to which the base is attached. Further, the bulging portion is formed so as to bulge from the outer peripheral surface at the end portion of the bulb, and is formed such that the tip is located inside the virtual tangent line that is in contact with the outer peripheral surface of the end portion of the adjacent bulb. Therefore, the fluorescent lamp can be easily manufactured, and the fluorescent lamp can be made inexpensive. In addition, the fluorescent lamp is hardly brought into contact with an interference object during assembly and handling, and damage can be prevented as much as possible.

  According to the invention of claim 2, since the bulging portion has a thickness of the thin portion of 0.28 to 0.4 mm and a protruding length from the outer peripheral surface of the valve of 1.5 to 4.0 mm, The thin-walled portion of the fluorescent lamp can be broken at an early stage when abnormal discharge occurs to stop the abnormal discharge, and a bulging portion that does not impair the design of the fluorescent lamp is formed. be able to.

  According to the invention of claim 3, since the fluorescent lamp according to claim 1 or 2 is provided, there is provided a lighting apparatus capable of stopping abnormal lighting of the fluorescent lamp at an early stage of abnormal lighting by the fluorescent lamp itself. can do.

  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 to 4 show a first embodiment of the present invention, in which FIG. 1 is a partially cutaway schematic front view on the end side of a fluorescent lamp, and FIG. FIG. 3 is a layout view of each bulb of the fluorescent lamp, FIG. 4 is a fluorescent lamp, (a) is a schematic front view, and (b) 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. 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 6 is made of, for example, a copper wire having an outer diameter of 0.6 mm.

  The inner wires 5 and 5 support the both ends of the filament 8 by sandwiching them, for example. The filament 8 is made of a tungsten (W) wire and is formed of a double coil or a triple coil. Further, a glass bead 9 formed in a substantially rectangular parallelepiped is stretched around the inner wires 5 and 5. The glass bead 9 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-like glass materials so as to sandwich the inner wires 5 and 5. Is formed.

  The arc tube 3 has two bulbs 10, 10, a crushing sealing portion 11, a joint portion 12 (shown in FIG. 3), and a bulging portion 13. Each bulb 10 is made of lead-free glass having a tube outer diameter of 12 to 20 mm and a wall thickness of 0.7 to 2.0 mm. For example, a straight glass tube having a tube outer diameter of 18 mm and a wall thickness of 1.0 mm is shown in FIG. As shown in b), it is bent into a U shape. As shown in FIG. 1, each valve 10 crushes and seals a pair of lead-in wires 2 and 2 at one end 10 a. 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 7. In this way, the filament 8 is disposed by the pair of inner wires 5 and 5 inside the one end portion 10a side of the different bulbs 10, and the outer wires 6 of the pair of lead-in wires 2 and 2 from the one end portion 10a of the different bulbs 10 respectively. , 6 are derived.

  As shown in FIG. 3, the other end portion 10 b of each valve 10 is crushed and sealed, and a thin tube 14 is attached so as to communicate with the valve 10 in the crushed seal. At least one of the thin tubes 14 is used as an exhaust pipe. The thin tube 14 is made of, for example, lead-free glass or lead glass having an outer diameter of 5.0 mm and an inner diameter of 3.8 mm, and the tip side is chipped off. The other end portions 10 b of each valve 10 are communicated with each other by a joint portion 12. The joint portion 12 is formed by heating and blowing a part of the outer peripheral surface of each other end portion 10b, and then joining the blown portions with an outer diameter of 7 to 20 mm. It has become. Moreover, the joint part 12 is formed in the predetermined | prescribed site | part of the outer peripheral surface of the other end part 10b so that valve | bulb 10 and 10 may connect and oppose.

  The bulging portion 13 is one end portion 10 a of the valve 10 in which the pair of lead-in wires 2 and 2 are crushed and sealed, and is formed in the vicinity of the crushed and sealed portion 11. The bulging portion 13 is connected more than the virtual tangent line A that is in contact with the outer peripheral surfaces of the one end portion 10a of the adjacent valve 10 and the other end portion 10b of the valve 10 when the valves 10 and 10 are connected by the joint portion 12. It is formed so that a tip may be located inside the formed valves 10 and 10. And as shown in FIG. 1, it forms so that it may have the thin part 13a thinner than the thickness of the valve | bulb 10. As shown in FIG. 1 and 2, the bulging portion 13 is shown at a position different from the position shown in FIG. 3 in order to clarify the protruding length L1 and the thickness D1 of the thin portion 13a.

  For example, the bulging portion 13 can be formed simultaneously with the introduction wires 2 and 2 supporting the filament 8 at one end portion 10a of the bulb 10 and the thin tube 14 at the other end portion 10b. That is, the formation part of each of the crushing sealing part 11 and the bulging part 13 of the one end part 10a of the valve 10 forming the bulging part 13 and the forming part of the sealing part of the other end part 10b are heated with, for example, a burner, Immediately after crushing the one end 10a and the other end 10b, air can be blown from the thin tube 14 to bulge the heated portion. Then, by setting the heating time and heating temperature in the burner and the amount of air blown in advance, a thin portion 13a having a predetermined thickness D1, for example 0.30 mm, is formed, and a predetermined protruding length from the outer peripheral surface of the valve 10 L1 can be formed to have, for example, 3.0 mm.

  The bulging portion 13 is formed so that the thickness D1 of the thin portion 13a is 0.28 to 0.4 mm. That is, if the thickness D1 is less than 0.28 mm, a crack may occur in the thin portion 13a when an impact is applied to the valve 10. Further, even when the fluorescent lamp 1 is normally lit, the thin portion 13a may be melted and broken by heat from the filament 8 or the inner wires 5 and 5. If the thickness D1 exceeds 0.4 mm, it takes time to melt the thin portion 13a when abnormal discharge occurs in the filament 8 or the inner wires 5 and 5, and the thin portion 13a is not broken at an early stage. There is a fear.

  Moreover, the bulging part 13 is formed so that the protrusion length L1 from the outer peripheral surface of the valve | bulb 10 may be 1.5-4.0 mm. That is, when the protrusion length L1 is less than 1.5 mm, the bulging amount of the heated portion of the bulb 10 is small, and it is difficult to form the thin portion 13a having the predetermined thickness D1. Further, if the protruding length L1 exceeds 4.0 mm, depending on the position where the bulging portion 13 is formed, the bulging portion 13 may come into contact with the other valve 10 and be damaged when the valves 10 are connected to each other. is there. Moreover, as a result of the enlargement of the bulging portion 13, the area of the bulging portion 13 on the outer peripheral surface of the valve 10 is increased, which may impair the appearance and design of the valve end 10 a side.

As described above, the arc tube 3 is formed, and a discharge path is formed between the filaments 8 and 8 in the connected bulbs 10 and 10. On the inner surface of the bulb 10, for example, a three-wavelength light emitting phosphor film 4 is formed. Here, the phosphor film 4 may be formed on a protective film made of, for example, alumina (Al ₂ O ₃ ) fine particles formed on the inner surface of the bulb 10. The arc tube 3 is sealed with a rare gas such as mercury and argon (Ar), krypton (Kr), neon (Ne), and xenon (Xe) as a discharge medium.

  A base 16 having four connection pins 15 is disposed at both ends 10a and 10b of each connected valve 10 as shown in FIG. The base 16 is, for example, a GX10q-4 type for a compact fluorescent lamp, and is formed of polybutylene terephthalate (PBT) resin, polyethylene terephthalate (PET) resin, polyether imide (PEI) resin, or the like. The outer wires 6 and 6 led out from the crushing sealing portion 11 of the arc tube 3 are connected to the connection pins 15.

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

  In the fluorescent lamp 1, when a high frequency voltage is applied to the four connection pins 15 of the base 16, a discharge is generated between the pair of filaments 8 and 8 in the arc tube 3, and visible light is emitted from the phosphor film 4. Is done. In this normal lighting state, the glass bead 9 is not abnormally overheated by the heat from the filament 8, and the crushing sealing portion 11 is not abnormally overheated. That is, in the normal lighting state of the fluorescent lamp 1, the thin portion 13a of the bulging portion 13 is not broken.

  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 and a half-wave discharge state is generated, and the filament 8 generates abnormal heat. Further, as shown in FIG. 2, when the filament 8 is melted and evaporated due to the abnormal heat generation, the half-wave discharge is transferred from the inner wire 5 to the support portion 5a of the glass bead 9 of the inner wire 5, This part of 5 generates abnormal heat. Due to this abnormal heat generation, the glass bead 9 may melt and hang down in the lighting direction.

  Thereafter, the half-wave discharge shifts to the crushing sealing portion side 5b of the inner wire 5, and the crushing sealing portion side 5b generates abnormal heat. Due to the abnormal heat generation on the crushing and sealing part side 5b of the inner wire 5, the crushing and sealing part 11 around the crushing and sealing part side 5b is heated, and the temperature rises rapidly. As the temperature of the crushing sealing portion 11 rises, the temperature of the bulging portion 13 rises and the outer surface of the bulging portion 13 gradually melts. Then, the melting of the outer surface of the bulging portion 13 proceeds, and the crack 17 enters and breaks due to the pressure difference between the inside and outside of the valve 10 in the thin portion 13a.

  When a crack 17 enters the thin portion 13 a of the bulging portion 13, air flows into the arc tube 3 from the crack 17. As a result, the lamp voltage between the filaments 8 and 8 in the arc tube 3 is increased, and the half-wave discharge cannot be maintained in the filament 8 or the inner wire 5 and the half-wave discharge is stopped. That is, the fluorescent lamp 1 is turned off.

  Thus, when half-wave discharge occurs in the filament 8 or the inner wire 5 and abnormal heat is generated, a crack 17 enters the thin portion 13a of the bulging portion 13a, and air flows into the arc tube 3 from the crack 17. Therefore, half-wave discharge (abnormal discharge) stops at an early stage. Thereby, the thermal damage to the resin member of the base 16 provided at the both end portions 10a and 10b of each valve 10 and the socket to which the base 16 is mounted can be suppressed as much as possible.

  And the bulging part 13 heats the outer peripheral surface near the crushing sealing part 11 of the one end part 10a of the valve | bulb 10 with a burner, for example, then blows air from the thin tube 14 arrange | positioned at the other end part 10b, and heats it. Therefore, the fluorescent lamp 1 can be manufactured at low cost without requiring an advanced manufacturing process and as a result.

  And the bulging part 13 sets the valve | bulb 10 so that the thickness D1 of the thin part 13a may be set to 0.28-0.4mm by presetting the heating time in a burner, heating temperature, and the blowing amount of air. The protrusion length L1 from the outer peripheral surface of the film can be formed to be 1.5 to 4.0 mm. As a result, the crack 17 can be prevented from entering the thin portion 13a of the bulging portion 13 during normal lighting of the fluorescent lamp 1, and the crack 17 can be generated in the thin portion 13a at an early stage during abnormal lighting. It is possible to prevent the protruding portion 13 from being conspicuous and impairing the design on the one end portion 10a side of the valve 10.

  In addition, the bulging portion 13 is formed so that the tip is located inside the virtual tangent line A that contacts the outer peripheral surfaces of the one end portion 10a of the adjacent valve 10 and the other end portion 10b of the valve 10, respectively. It is located inside the outer shape of the bulbs 10, 10. As a result, it is possible to prevent the bulging portion 13 from being damaged by colliding with the interference object when assembling such as attaching the arc tube 3 to the base 16 or handling the fluorescent lamp 1 and to form the bulb 10 by forming the bulging portion 13. It can prevent that the design property by the side of one end part 10a is impaired.

  The fluorescent lamp 1 has a glass bead 9 between the inner wires 5 and 5, but even if the glass bead 9 is not provided, the fluorescent lamp 1 swells due to abnormal heat generation of the filament 8 or the inner wire 5. The outer surface of the protruding portion 13 is melted and cracks 17 enter the thin portion 13a.

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

  FIG. 5 is a layout diagram of each bulb of a fluorescent lamp showing a second embodiment of the present invention, and FIG. 6 is a layout diagram of each bulb of another fluorescent lamp. Note that the same parts as those in FIG.

  The fluorescent lamp 18 shown in FIG. 5 has three bulbs 19a, 19b, and 19c, and an arc tube 20 is formed. The valves 19a and 19c on both sides are formed in the same manner as the valve 10 shown in FIG. 1, and the crushing and sealing portions 11 are formed by crushing and sealing the pair of lead wires 2 and 2 to the one end portions 19aa and 19ca, respectively. And the thin tubes 14 are disposed at the other end portions 19ab and 19cb, respectively. In the middle valve 19b, a crushing sealing portion 21 that does not crush and seal the pair of lead-in wires 2 and 2 is formed at one end portion 19ba, and the narrow tube 14 is disposed at the other end portion 19bb. The rest of the valve 19b is formed in the same manner as the valves 19a and 19b.

  The other end portion 19ab of the valve 19a and one end portion 19ba of the valve 19b are communicated by the joint portion 12, and the other end portion 19cb of the valve 19c and the other end portion 19bb of the valve 19b are communicated by the joint portion 12. That is, the valve end portions 19ab, 19ba, 19bb, 19cb are communicated with each other by the joint portion 12, except for the valve end portions 19aa, 19ca having the crushing sealing portion 11 from which the pair of lead-in wires 2, 2 are led out. The valves 19a, 19b, 19c are connected so as to have a substantially hexagonal outer shape.

  And the bulging part 13 is a site | part of the outer peripheral surface which is the vicinity of the crushing sealing part 11 of valve | bulb edge part 19aa, 19ca and is orthogonal to the longitudinal direction of the filament 8, and adjoining valve | bulb edge part 19aa, 19ab The valve end portions 19ca, 19cb and the valve end portions 19aa, 19ca are formed on the outer peripheral surface of the valve 19a, 19b, 19c, the tip of which is connected to the inner side of the virtual tangent line A. . Thereby, the bulging part 13 becomes difficult to contact | abut to an interference object. Therefore, damage to the bulging portion 13 can be prevented as much as possible, and the design of the valve end portions 19aa, 19ca can be prevented from being damaged by the bulging portion 13.

  When an abnormal discharge occurs at the end of the life of the fluorescent lamp 18, a crack 17 enters the thin portion 13 a of the bulging portion 13 at an early stage, and air flows into the arc tube 20 from the crack 17. Stop. As a result, thermal damage to the base 16 and the socket to which the base 16 is mounted can be prevented as much as possible.

  Moreover, the fluorescent lamp 22 shown in FIG. 6 is provided with a bulb 23a and a bulb 23b in place of the intermediate bulb 19b in the fluorescent lamp 18 shown in FIG. That is, the bulb end portions 19aa, 19ca having the crushing sealing portion 11 in which the arc tube 24 is formed with the four bulbs 19a, 23a, 23b, 19c and the pair of lead-in wires 2, 2 are led out. In addition, the valve end portions 19ab, 23aa, 23ab, 23ba, 23bb, and 19cb are communicated with each other by the joint portion 12, and the valves 19a, 23a, 23b, and 19c are connected to each other to have a substantially octagonal outer shape. .

  And the bulging part 13 is the site | part of the outer peripheral surface of the vicinity of the crushing sealing part 11 of valve | bulb edge part 19aa and 19ca, and the same direction as the longitudinal direction of the filament 8, and adjacent valve | bulb edge part 19aa, 19ab, It is formed in a portion of the outer peripheral surface where the tip is located inside the valves 19a, 23a, 23b, 19c connected to the valve end portions 19ca, 19cb and the virtual tangent line A contacting the outer peripheral surfaces of the valve end portions 19aa, 19ca, respectively. Yes. As a result, the bulging portion 13 can be prevented as much as possible from being damaged due to difficulty in contact with the interference. Moreover, it can prevent that the design property of valve | bulb edge part 19aa and 19ca is impaired by the bulging part 13. FIG.

  Then, similarly to the fluorescent lamp 18, the fluorescent lamp 22 can prevent thermal damage to the base 16 and the socket to which the base 16 is attached as much as possible.

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

  FIG. 7 is a partially cutaway schematic side view of a luminaire showing a third embodiment of the present invention. The same parts as those in FIG.

  The lighting fixture 25 shown in FIG. 7 is a downlight embedded in a construction such as a ceiling (not shown), and has a fixture main body 26, the fluorescent lamp 1 and the lighting device 27 shown in FIG. The appliance body 26 has a top plate 28 on the upper surface side and a lamp socket 29 on the lower surface side. A lighting device 27 is disposed on the upper surface 28 a of the top plate 28. The fluorescent lamp 1 is attached to the lamp socket 29. That is, the four connection pins 15 of the base 16 of the fluorescent lamp 1 are inserted into the lamp socket 29.

  The lighting device 27 is configured to apply a high-frequency voltage to the connection pin 15 of the base 16 via the lamp socket 29. Thereby, the fluorescent lamp 1 is lit at a high frequency.

  The top plate 28 is attached with a pair of support fittings 30, 30 having spring properties. A reflective mirror 31 formed in a substantially rectangular shape is attached to the support fittings 30 and 30 so as to cover the fluorescent lamp 1. A decorative frame 32 having a circular outer shape is disposed around the lower portion of the reflecting mirror 31.

  In addition, the appliance body 26 is provided with a connection fitting 33 extending from the top plate 28 to the decorative frame 32, and the attachment fitting 34 for fixing the appliance body 26 to a construction such as a ceiling is provided on the connection fitting 33. Yes.

  When the fluorescent lamp 1 is turned on, the radiated light from the arc tube 3 becomes direct light and reflected light reflected by the inner surface of the reflecting mirror 31, and is emitted from the opening 31a of the reflecting mirror 31 to the external space. When the fluorescent lamp 1 is abnormally turned on such as half-wave discharge, the fluorescent lamp 1 is turned off at the early stage of the fluorescent lamp 1 itself and abnormal lighting. Therefore, it is possible to provide the lighting fixture 25 in which thermal damage to the cap 16 and the lamp socket 29 of the fluorescent lamp 1 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. Similarly, the layout of each bulb of the fluorescent lamp. Similarly, it is a fluorescent lamp, (a) is a schematic front view, (b) is a schematic side view. The layout of each bulb | ball of the fluorescent lamp which shows the 2nd Embodiment of this invention. Similarly, the layout of each bulb of another fluorescent lamp. The partial notch schematic side view of the lighting fixture which shows the 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,18,22 ... Fluorescent lamp 2 ... Introductory line 3, 20, 24 ... Arc tube 4 ... Phosphor film 25 ... Lighting fixture 26 ... Appliance main body 27 ... Lighting device

Claims (3)

A pair of lead wires supporting both ends of the filament;
A bulb made of glass bent so that each end portion is parallel, a crushing sealing portion formed by crushing and sealing each of the pair of lead wires to at least a pair of end portions of the bulb, A joint portion formed such that the other valve ends excluding the valve end portion where the crushing sealing portion is formed are sealed, the end portions communicate with each other, and the valves are connected to each other, and the pair of lead wires Is formed so as to bulge from the outer peripheral surface of the valve so that the tip is located on the inner side of the virtual tangent line that contacts the outer peripheral surface of the adjacent valve end. An arc tube having a bulge with a wall thickness less than that of the bulb;
A phosphor film formed on the inner surface of the bulb of the arc tube;
A discharge medium sealed inside the arc tube;
A fluorescent lamp characterized by comprising:   The bulb has a wall thickness of 0.7 to 2.0 mm, and the bulging portion has a thin wall portion with a thickness of 0.28 to 0.4 mm and a protrusion length from the outer peripheral surface of the bulb of 1.5 to The fluorescent lamp according to claim 1, wherein the fluorescent lamp is 4.0 mm. A fluorescent lamp according to claim 1 or 2;
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.

Images