JP2007214091A - Compact self-ballasted fluorescent lamp, and luminaire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact self-ballasted fluorescent lamp wherein a globe can be formed so as to have an identical or an approximate size to that of an electric bulb for general illumination, and deterioration of light emitting efficiency can be suppressed, and to provide a luminaire to which this compact self-ballasted fluorescent lamp is mounted. <P>SOLUTION: This compact self-ballasted fluorescent lamp 1 has a bulb 11 formed by connecting a plurality of U-shaped tubes 7, 8, 9 the tube diameters of which are 3 to 8 mm, and a capillary tube 13 is connected to the top part 8a of at least the U-shaped tube 8. The compact self-ballasted fluorescent lamp is also equipped with an arc tube 2 having the maximum diameter D1, D2 of 30 mm or less in the direction perpendicular to the longitudinal direction of the bulb 11, a lighting circuit 3, a support member 4 which supports the arc tube 2 and is directly and indirectly fixed to a base 5, and a globe 6 which is directly and indirectly mounted to the base 5 and the opening end part 6a of which has the maximum diameter D3 of 35 mm or less. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a light bulb-type fluorescent lamp having an arc tube having a bulb connected with a plurality of U-shaped tubes, and a lighting fixture equipped with the light bulb-type fluorescent lamp.

  In a bulb-type fluorescent lamp having a globe that covers the arc tube, heat emitted from the arc tube during lighting is trapped in the globe, and the temperature of the arc tube tends to rise excessively. When the temperature of the arc tube rises, the mercury vapor pressure in the arc tube increases and the luminous efficiency decreases, so that the mercury vapor pressure in the arc tube during lighting is maintained within a predetermined range. And the conventional bulb-type fluorescent lamp has a thin tube provided at the end of the arc tube, and amalgam is enclosed in the inside (see, for example, Patent Document 1). That is, the amalgam inside the narrow tube, the temperature of which is lower than that of the arc tube, is controlled so as to suppress the mercury vapor pressure in the arc tube at a high temperature to prevent a decrease in luminous efficiency.

  In addition, a bulb-type fluorescent lamp has been proposed in which a protrusion is provided at the tip of a double spiral arc tube, and the protrusion is brought into contact with a globe (for example, see Patent Document 2). In this conventional bulb-type fluorescent lamp, the protrusion is disclosed as having a height of 3 mm and a thickness of about 0.06 mm, and its outer surface is in contact with a globe (outer tube). By this contact, the heat of the arc tube is transferred to the globe through the projecting portion, and the projecting portion becomes the place (the coldest portion) where the temperature of the tube wall of the arc tube is the lowest.

In addition, a bulb-type fluorescent lamp has been proposed in which a protrusion is provided at the tip of a double spiral arc tube, and the protrusion is embedded in a thermally conductive medium and thermally connected to the globe (for example, , See Patent Document 3). In this prior art bulb-type fluorescent lamp, the protrusion is 3 mm high and about 0.06 mm thick, and its outer surface is separated from the glove (outer tube) by about 1.7 mm. It is disclosed that it is embedded in a filled thermally conductive medium. As the heat conductive medium, a normal silicone resin or a mixture of a silicone resin and a metal powder such as an aluminum powder is used. The heat of the arc tube is transferred to the globe through the protrusion and the heat conductive medium, and the protrusion becomes the coldest part of the arc tube.
JP 2000-21351 (page 7, FIG. 6) Japanese Patent Laying-Open No. 2005-251448 (page 4, FIG. 1) Japanese Patent Laying-Open No. 2005-251449 (page 4-5, FIG. 1)

  Since the bulb-type fluorescent lamp of Patent Document 1 has a thin tube at the end of the arc tube, the thin tube is located in the base or the cover, and the arrangement of the lighting circuit components in the base or the cover is limited. In other words, the design margin is limited. In particular, the bulb-type fluorescent lamp that reduces the outer diameter of the arc tube increases the temperature rise of the arc tube as the outer surface area of the arc tube decreases, so the total length of the narrow tube extending to the base side is lengthened, It is necessary to make the temperature of the tip as low as possible by separating the tip from the end of the arc tube. In other words, the longer the full length of the narrow tube, the larger the space of the narrow tube in the base or the cover, which has the disadvantage of hindering miniaturization of the bulb-type fluorescent lamp.

  In addition, each of the bulb-type fluorescent lamps of Patent Document 2 and Patent Document 3 is easily affected by heat due to discharge because the protruding portion where the coldest portion is formed is close to the discharge path of the arc tube, and mercury vapor in the arc tube It has the disadvantage that it is difficult to control the pressure properly. In particular, as the outer diameter of the arc tube becomes thinner, the amount of heat generated per unit area on the outer surface increases, making it difficult to control the mercury vapor pressure in the arc tube. That is, the bulb-type fluorescent lamps of Patent Literature 2 and Patent Literature 3 have a drawback that it is difficult to reduce the size of the bulb-type fluorescent lamp by reducing the outer diameter of the arc tube.

  By the way, in order to make the bulb-type fluorescent lamp the same shape as the incandescent bulb and to emit light to the vicinity of the base of the globe, the minimum outer diameter of the opening end portion on the base side of the globe is set to 35 mm or less, and It is necessary to arrange in the vicinity of the opening end. However, the arc tube formed in a double spiral shape needs to bend glass with a spiral diameter smaller than the inner diameter of the opening of the globe, and a bulb having a tube outer diameter of 3 to 8 mm has a small spiral diameter. The winding length will be shortened.

  When the spiral winding length is shortened, the bulb length is also shortened, and consequently the discharge path length is also shortened, so that the light emission efficiency tends to be lowered. Further, if the spiral diameter is small, the curvature of the bent portion is small, so that it is difficult to process the valve and it is difficult to ensure the strength. For this reason, in order to make the globe emit light to the vicinity of the base with the same size as the incandescent bulb, the spiral arc tube is not suitable.

  An object of the present invention is to provide a bulb-type fluorescent lamp in which a globe is formed to be the same size or approximate size as a general lighting bulb, and to suppress a decrease in luminous efficiency, and a lighting fixture equipped with the bulb-type fluorescent lamp. To do.

  The invention of the bulb-type fluorescent lamp according to claim 1 has a bulb in which a plurality of U-shaped tubes having a tube outer diameter of 3 to 8 mm are connected, and the maximum diameter in a direction perpendicular to the longitudinal direction of the bulb is 30 mm or less. An arc tube having a thin tube connected to the top of at least one of a plurality of U-shaped tubes; a lighting circuit for lighting the arc tube; a support member for supporting the arc tube; A base having a base shell portion that accommodates at least a part of the lighting circuit, and a support member fixed directly or indirectly to the opening end side of the base shell portion; directly covering the arc tube Or a glove that is indirectly attached to the base and has a maximum outer diameter of 35 mm or less at the open end.

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

  In the arc tube, electrodes are sealed at a pair of ends, and a phosphor film is formed on the inner surface of the bulb (the inner surface of the U-shaped tube) to constitute a fluorescent lamp.

  The “top portion of the U-shaped tube” is, for example, a portion side that is formed at a bent portion when a straight tubular valve is bent by heating and softening, and is farthest from the end portion of the valve.

  One end side (tip portion) of the thin tube is melted (chip-off), and communicates with the valve on the other end side. It is preferable that no phosphor film is formed on the inner surface side of the thin tube. That is, if a phosphor film is formed on the inner surface side of the narrow tube that is separated from the discharge path, the luminous flux is blocked by the phosphor film, and the narrow tube portion looks dark, which is not desirable.

  When the outer diameter of the U-shaped tube is smaller than 3 mm, the starting voltage of the arc tube increases, the luminous efficiency decreases, and the connection of the bulbs becomes difficult. Further, if the tube outer diameter of the U-shaped tube is larger than 8 mm, it is difficult to make the maximum diameter in the direction orthogonal to the longitudinal direction of the bulb 30 mm or less. Therefore, the tube outer diameter of the U-shaped tube is defined as 3 to 8 mm.

  When the maximum outer diameter of the opening end of the globe is larger than 35 mm, it is difficult to obtain an appearance and light distribution characteristics close to those of a general lighting bulb. Therefore, the maximum outer diameter of the opening end of the globe is 35 mm or less. The lower limit value of the maximum outer diameter is appropriately determined depending on the maximum diameter of the valve, the size of the support member, and the like.

  If the maximum diameter in the direction perpendicular to the longitudinal direction of the bulb is larger than 30 mm, it is difficult to accommodate the arc tube inside the opening end side of the globe. Therefore, the maximum diameter is 30 mm or less. Further, the lower limit value of the maximum diameter is appropriately determined depending on the outer diameter of the U-shaped tube, the arrangement of a plurality of U-shaped tubes, and the like.

  “The base directly fixing the support member” means, for example, that the support member is fixed to the base by a fixed object such as an adhesive, or that the support member is held and fixed by the base. Means.

  In addition, “the base indirectly fixing the support member” means that an intermediate member is interposed between the support member and the base. For example, the support member is fixed to a cover (base) or the like. This means that the cover (base) or the like is fixed to the base.

  “Glove that is directly attached to the base” means, for example, that the glove is fixed to the base by a fixed object such as an adhesive, or that the glove is held and fixed by the base. To do.

  The term “indirectly attached glove” means that an intermediate member is interposed between the glove and the base. For example, the glove is attached to a cover (base) or the like. This means that a cover (base) is attached to the base.

  When the globe covers the arc tube, the thin tube may or may not be in contact with the inner surface.

  According to the present invention, the portion (tip portion) on the globe side of the thin tube connected to the top of the U-shaped tube is close to the globe and is separated from the discharge path of the arc tube. The difference is large and becomes the coldest spot of the arc tube. Depending on the temperature at the coldest spot, mercury moves (diffuses) from the inside of the thin tube to the inside of the arc tube or moves (aggregates) from the inside of the arc tube to the inside of the thin tube, and the mercury vapor pressure in the arc tube is maintained within a predetermined range. Since the bulb is formed of a U-shaped tube, the bulb processing is easier than the double spiral arc tube, and a longer discharge path length can be secured. Can be emitted. Thereby, the luminous efficiency at the time of lighting improves.

  In addition, since a thin tube is used as the formation part of the coldest part, a glass tube having a predetermined thickness can be used, and the formation part of the coldest part can be compared with the case where a protruding part that tends to be thin is provided. The strength is prevented from decreasing and the diameter of the narrow tube is small, so the internal mercury is less noticeable.

  The arc tube is formed so that the maximum diameter in the direction perpendicular to the longitudinal direction of the bulb is 30 mm or less, and the globe is formed so that the maximum outer diameter of the opening end is 35 mm or less. The size of the supporting member to be supported is limited, and the size of the intermediate member such as a cover (base) for fixing the supporting member to the base is also limited, so that the globe can be formed to the same size or approximate size as a general lighting bulb It becomes. And by restrict | limiting the magnitude | size of the said intermediate member, the base part of a glove | globe is formed to the vicinity of a nozzle | cap | die, and the glove | light is output to the vicinity of a nozzle | cap | die at the time of lighting.

  The invention of the light bulb shaped fluorescent lamp according to claim 2 is the light bulb shaped fluorescent lamp according to claim 1 or 2, wherein the thin tube connected to the top of the U-shaped tube is connected to the inner surface side of the globe via a heat conductive material. It is characterized by being connected to.

  The heat conductive part only has to have heat resistance and heat conductivity and can be solidified, for example, a silicone resin, a silicone resin containing a metal powder such as an aluminum powder, or the like. Further, it is desirable that the heat conductive material has translucency. By having translucency, loss of radiated light from the arc tube due to the heat conductive material is reduced.

  According to the present invention, the heat of the glove-side portion (tip portion) of the thin tube connected to the top of the U-shaped tube is transferred to the globe via the thermally conductive material and released from the globe to the outside air. . In addition, since the tip of the thin tube is separated from the discharge path of the arc tube, the temperature difference from the arc tube becomes even larger than when no thermally conductive material is present, and it becomes the coldest spot of the arc tube. . Depending on the temperature at the coldest spot, mercury moves (diffuses) from the inside of the narrow tube to the arc tube or moves (aggregates) from the inside of the arc tube to the inside of the thin tube, and the mercury vapor pressure in the arc tube is maintained within a predetermined range. The Thereby, the luminous efficiency at the time of lighting is further improved as compared with the case where no thermally conductive substance is present.

  The bulb-type fluorescent lamp according to claim 3 is the bulb-type fluorescent lamp according to claim 1 or 2, wherein the globe has a small hole portion and is connected to the top of the U-shaped tube. Is arranged inside the small hole portion.

  According to the present invention, since the narrow tube communicates with the outside air through the small hole portion of the globe, the coldest spot is more easily formed by releasing heat to the outside air. Thereby, the luminous efficiency of the arc tube is further improved. In addition, the appearance of the globe is well maintained by disposing the narrow tube inside the small hole portion.

  The invention of the lighting fixture according to claim 4 is the light bulb shaped fluorescent lamp according to any one of claims 1 to 3; a fixture main body provided with a light bulb socket to which the light bulb shaped fluorescent lamp is mounted; It is characterized by comprising.

  According to the present invention, there is provided a lighting fixture in which the light bulb shaped fluorescent lamp according to any one of claims 1 to 3 is disposed.

  According to the first aspect of the present invention, the bulb-type fluorescent lamp can form the globe in the same size or approximate size as the general lighting bulb, and the globe is optically output (emitted) to the vicinity of the base, and the luminous efficiency is high. Since it improves, the external appearance, light distribution characteristic, and brightness (luminous flux) close to those of a general lighting bulb can be obtained, and it can be applied to a luminaire using the general lighting bulb. In addition, since the thin tube is connected to the top of the U-shaped tube constituting the arc tube, the lighting circuit component housed in the base shell portion is not interfered with the thin tube, and the lighting circuit component in the base shell portion The arrangement space is increased, and as a result, the design margin of the lighting circuit can be improved.

  Since the bulb is formed of a U-shaped tube, the bulb processing is easier than the double spiral arc tube, and a longer discharge path length can be secured. You can

  According to the invention of claim 2, since the thin tube is connected to the inner surface side of the globe via the heat conductive material, the thin tube becomes the coldest spot of the arc tube than when no heat conductive material is interposed. The temperature difference between the tip of the lamp and the arc tube further increases, and as a result, the mercury vapor pressure in the arc tube can be further controlled, and the luminous efficiency during lighting can be further improved. A predetermined light beam can be stably output.

  According to the invention of claim 3, since the coldest spot is more easily formed by releasing the heat of the narrow tube to the outside air through the small hole portion of the globe, the luminous efficiency of the arc tube is further improved. A predetermined luminous flux can be stably output from the bulb-type fluorescent lamp.

  According to invention of Claim 4, the lighting fixture which arrange | positions the lightbulb-type fluorescent lamp as described in any one of Claim 1 thru | or 3 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.

  FIG. 1 is a light bulb shaped fluorescent lamp showing a first embodiment of the present invention, FIG. 1 (a) is a longitudinal sectional front view, and FIG. 1 (b) is a longitudinal sectional side view.

  The bulb-type fluorescent lamp 1 includes a light emitting tube 2, a lighting circuit 3, a support member 4, a base 5, and a globe 6.

  The arc tube 2 has one bent bulb 11 in which three U-shaped tubes 7, 8, 9 are connected by joints 10, 10. Each of the U-shaped tubes 7, 8, 9 is made of, for example, soda lime glass (LM glass) or barium silicate glass (lead-free glass), and is bent to have the same surface shape. The imaginary planes formed by connecting the center points when the straight pipe portions of 8 and 9 are cut in the direction orthogonal to the longitudinal direction are connected by the joint portions 10 and 10 so as to be substantially parallel to each other. Here, the U-shaped tube 8 is positioned between the U-shaped tube 7 and the U-shaped tube 9.

  Further, as shown in FIG. 1A, the U-shaped tubes 7, 8, and 9 are formed in substantially the same size in the longitudinal direction. ), The length between the straight pipe portions is larger than that of the U-shaped tube 7 and the U-shaped tube 9. Each U-shaped tube 7, 8, 9 is a glass tube having a tube outer diameter of 3 to 8 mm, for example, an 8 mm glass tube.

  The valve 11 has a maximum diameter D1, D2 of 30 mm or less in the direction orthogonal to the longitudinal direction of the valve 11 (U-shaped tubes 7, 8, 9) when the U-shaped tubes 7, 8, 9 are connected by the joint portions 10, 10. It is trying to become. As shown in FIG. 1B, the U-shaped tube 8 is formed so that the size (the maximum diameter) D2 in the direction orthogonal to the longitudinal direction is 30 mm or less.

  The bulb 11 is filled with a discharge medium such as mercury and argon gas as a rare gas, and a phosphor layer 12 that emits visible light is formed on the inner surface of each U-tube 7, 8, 9. .

  A thin tube 13 is connected to the top 8 a of the U-shaped tube 8 among the U-shaped tubes 7, 8, 9. The thin tube 13 is made of lead glass having a tube outer diameter of 2 mm and a wall thickness of 0.5 mm, for example, and protrudes from the top 8 a of the U-shaped tube 8 by a predetermined length, for example, 8 to 10 mm. For example, after the phosphor film 12 is formed on the inner surface of the U-shaped tube 8, the narrow tube 13 is welded to an opening formed by heating and blowing the other end 13 a to the top 8 a of the U-shaped tube 8, One end side 13b is sealed (chip-off). Mercury 14 that moves (diffuses) from the narrow tube 13 to the inside of the valve 11 or moves (aggregates) from the inside of the valve 11 to the inside of the narrow tube 13 stays inside the narrow tube 13.

  Further, at one end portions 7b, 8b, and 9b of the U-shaped tubes 7, 8, and 9, thin tubes 15, 16, and 17 for exhausting or connecting the U-shaped tubes are provided. An auxiliary amalgam (not shown) is sealed at predetermined ends of the U-shaped tubes 7, 8, 9.

  A pair of filament electrodes (not shown) are sealed at both ends of the bulb 11, that is, at one end 7b, 9b of each of the U-shaped tube 7 and the U-shaped tube 9. Then, a pair of lead wires (not shown) connected to both ends of the filament electrode are drawn out from the one end portions 7 b and 9 b, and the lead wires are connected to the lighting circuit 3. Thus, the arc tube 2 forms a fluorescent lamp that emits visible light. One end 7b, 8b, 9b of each U-shaped tube 7, 8, 9 and the other end 7c, 8c, 9c. Is supported by the support member 4. In FIG. 1B, the U-shaped tube 9 is not shown.

  The support member 4 is formed of a heat-resistant synthetic resin such as polybutylene terephthalate (PBT) and has a circular engagement claw 4a at the upper end of the side wall and is formed in a substantially cylindrical shape with a bottom. The bottom portion 4b is formed with through holes (not shown) through which the one end portions 7b, 8b, 9b of the U-shaped tubes 7, 8, 9 of the valve 11 and the other end portions 7c, 8c, 9c pass. ing. The valve 11 is fixed to the bottom portion 4b with an adhesive in a state where the respective one end portions 7b, 8b, 9b and the respective other end portions 7c, 8c, 9c of the U-shaped tubes 7, 8, 9 are penetrated through the through holes. Has been. Thus, the support member 4 supports the arc tube 2. The support member 4 is attached to a cover (base body) 18.

  The cover 18 is made of a heat-resistant synthetic resin such as polybutylene terephthalate (PBT), for example, and has a substantially cylindrical shape from the upper side of the cover body 18a. It is formed in a base attaching portion 18b extending to the base. A screw thread 19 is formed on the outer surface of the base mounting portion 18b, and an engagement groove 20 is formed on the inner surface of the cover main body portion 18a. Then, the base shell portion 5a of the base 5 that can be mounted on the socket for the light bulb is screwed to the screw thread 19 on the base mounting portion 18b, and the base 5 is fixed to the base mounting portion 18b by caulking on the opening end side 5aa. . Further, the engagement claw 4a of the support member 4 is fitted in the engagement groove 20 on the inner surface of the cover main body 18a. The support member 4 is fixed to the cover 18 by this fitting.

  Further, the cover 18 has a substantially disc-shaped holding member 21 fixed to the inside of the cover main body portion 18a by an adhesive. The holding member 21 is provided with a through hole (not shown) through which a lead wire led out from at least both ends 7c and 9c of the arc tube 5 is inserted. Further, the holding member 21 fixes the substrate 22 to the surface on the side of the base attaching portion 18b with an adhesive. The substrate 22 is attached to the inner surface of the cover 18.

  The substrate 22 is made of a heat-resistant synthetic resin such as polybutylene terephthalate (PBT), is formed in a substantially disk shape, and is mounted with circuit components (not shown) of the lighting circuit 3. The circuit components of the lighting circuit 3 are arranged inside the base attaching part 18b and further inside the base shell part 5a as shown by the hatched lines in FIG. A pair of lead wires (not shown) is drawn from the substrate 22 and connected to the base shell portion 5a and the base eyelet portion 5b of the base 5 respectively. The lighting circuit 3 is configured to operate when power is supplied to the substrate 22 through the base 5 and the lead wires, and to light the arc tube 2 at a high frequency.

  The base 5 constitutes an Edison-type base such as E26 type, and has a base shell portion 5a and a base eyelet portion 5b. The base 5 fixes the cover 18 to the opening end side 5aa of the base shell portion 5a. The cover 18 fixes the support member 4 in an engagement groove 20 formed on the inner surface of the cover main body 18a. That is, the base 5 indirectly fixes the support member 4 to the opening end side 5aa of the base shell portion 5a.

  The base 5 accommodates the circuit components of the lighting circuit 3 in the base shell portion 5 a via the base mounting portion 18 b of the cover 18. A pair of lead wires that are electrically connected to the lighting circuit 3 drawn from the substrate 22 are connected to the base shell portion 5a and the base eyelet portion 5b.

  Since the substrate 22 is disposed near the boundary between the cover main body 18a and the base attaching part 18b in the cover 18, all circuit components of the lighting circuit 3 are connected to the base shell of the base 5 via the base attaching part 18b. It is accommodated in the part 5a. However, depending on the arrangement position of the substrate 22 in the cover 18, some circuit components of the lighting circuit 3 are accommodated in the cover body 18b. That is, the cover 18 or the like may be formed so that the base shell portion 5 a accommodates a part of the circuit components of the lighting circuit 3.

  The globe 6 is formed in a smooth curved surface close to the shape of a glass bulb of a general lighting bulb such as an incandescent bulb by using transparent or light diffusing glass or synthetic resin. That is, it is formed in the same or approximate dimensions as a general lighting bulb defined in Japanese Industrial Standards (JIS C 7501). And the maximum outer diameter D3 of the opening edge part 6a in which the opening of the globe 6 is formed is 35 mm or less, for example, 32 mm.

  The globe 6 is fitted to the inner side of the lower end side of the cover body 18a of the cover 18 so as to cover the arc tube 2, and for example, an adhesive (not shown) such as silicone resin or epoxy resin. ). At this time, the other end portion (tip portion) 13b of the thin tube 13 formed on the top portion 8a of the U-shaped tube 8 of the arc tube 2 is in contact with or close to the inner surface of the globe 6 on the top portion 6b side. The globe 6 is indirectly attached to the base 5 via a cover 18.

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

  When the power supply voltage is applied to the base 5, the lighting circuit 3 mounted on the substrate 22 is supplied with power through the lead wires and operates. The lighting circuit 3 lights the arc tube 2 at high frequency.

  When the arc tube 2 is turned on, visible light is emitted from the bent bulb 11. That is, discharge is generated between a pair of electrodes sealed at the respective one end portions 7c and 9c of the U-shaped tubes 7 and 9, and ultraviolet rays are radiated from mercury vapor constituting the discharge medium. The phosphor film 12 is excited by the ultraviolet rays to emit visible light, and is emitted from the U-tubes 7, 8, and 9. The mercury vapor pressure in the valve 11 is controlled by the mercury 14 in the narrow tube 13.

  Since the thin tube 13 protrudes from the top 8 a of the U-shaped tube 8 by a predetermined length, for example, 8 to 10 mm, one end side (tip portion) 13 b is separated from the discharge path of the bulb 11. One end side (tip portion) 13b is in contact with or close to the inner surface of the globe 6 on the top portion 6b side. Thereby, one end side (tip portion) 13b of the thin tube 13 approaches the temperature of the globe 6 and the temperature difference with the U-shaped tube 8 becomes large, and becomes the coldest spot (coldest part) of the bulb 11.

  Then, the mercury 14 in the narrow tube 13 becomes mercury vapor and moves (diffuses) into the valve 11 according to the temperature of the valve 11 and the temperature of one end side (tip portion) 13b of the narrow tube 13, and the mercury in the valve 11 The vapor moves into the narrow tube 13 and aggregates as mercury 14. That is, excessive mercury vapor in the valve 11 moves into the narrow tube 13, and when the mercury vapor is insufficient in the valve 11, mercury vapor is supplied from the inside of the thin tube 13. Thereby, the mercury vapor pressure in the bulb 11 (the arc tube 2) is maintained within a predetermined range (appropriate range), and a decrease in luminous efficiency when the arc tube 2 is turned on is suppressed. The bulb-type fluorescent lamp 1 can obtain brightness (light flux) equivalent to that of a general lighting bulb.

  And the maximum diameter D1, D2 of the direction orthogonal to the longitudinal direction of the bulb | ball 11 (arc_tube | light_emitting_tube 2) is formed in 30 mm or less, The support member 4 which supports the arc_tube | light_tube 2 is the maximum diameter of the opening edge part 6a. D3 can be formed in a size to be inserted into the globe 6 having a diameter of 35 mm or less. And the glove | globe 6 can be formed in the same size or the approximate size with the light bulb for general illumination by forming the largest diameter D3 of the opening edge part 6a of the glove | globe 6 to 35 mm or less. Then, the cover main body portion 18a of the cover 18 that supports (adheres) the opening end 6a side of the globe 6 is limited to the minimum necessary size that can be supported, and extends from the opening end 5aa of the base 5. The thickness can be reduced.

  The bulb-type fluorescent lamp 1 has an appearance close to that of a general lighting bulb by forming the globe 6 to be the same or approximately the same size as the general lighting bulb and limiting the size of the cover body portion 18a of the cover 18. As described above, brightness (light flux) equivalent to that of a general lighting bulb can be obtained. Therefore, the present invention can be applied to a lighting fixture that uses a general lighting bulb.

  And in the cover main-body part 18, since the magnitude | size extended from opening end part 5aa of the nozzle | cap | die 5 is formed small, the opening edge part 6a side (root part) of the globe 6 becomes close to the nozzle | cap | die 5, and an arc tube When 2 is turned on, visible light radiated (light output) from the base portion of the globe 6 near the base 5 is irradiated to the socket side of the bulb for mounting the base 5. That is, the light bulb socket side can be illuminated with visible light emitted from the root portion of the globe 6, or the visible light irradiated to the light bulb socket side can be reflected to a desired location.

  The narrow tube 13 is connected to the top portion 8a of the U-shaped tube 8 and is not interposed in the base attachment portion 18b of the cover 18 and in the base shell portion 5a of the base 5, so that the inside of the base attachment portion 18b and the base shell portion The installation space for the circuit components of the lighting circuit 3 in 5a is increased, and the degree of freedom in installation is increased by the absence of interference by the thin tubes 13. As a result, the design margin of the lighting circuit 3 can be improved.

  And since the bulb | ball 11 is formed with the U-shaped tubes 7, 8, and 9, bulb processing is easier than a double spiral arc tube, and a longer discharge path length can be secured. As described above, the arc tube 2 is capable of emitting a predetermined light flux from the arc tube 2 because a decrease in luminous efficiency is suppressed. That is, the light bulb-type fluorescent lamp 1 can obtain a luminous flux substantially equivalent to that of a general lighting bulb.

  Further, since the thin tube 13 is as thick as, for example, 0.5 mm, the strength is hardly reduced, and the inner diameter is as thin as, for example, 1 mm, so that the mercury 14 staying inside is not noticeable.

  The narrow tube 13 may be provided on at least one of the top portions of the other U-shaped tubes 7 and 9 in addition to the top portion 8 a of the U-shaped tube 8. Of the plurality of thin tubes 13, one end side (tip portion) 13b of at least one thin tube 13 is the coldest spot (cold portion).

  Further, the thin tube 13 is folded at the approximate center of the glass tube, and both ends thereof are connected to the folded portion (top portion) of the arc tube formed in a double spiral shape (helical shape) turning around the turning axis. Also, the same operation and effect as described above can be obtained. One end side (tip portion) 13b of the thin tube 13 becomes the coldest spot (coldest portion) separated from the folded portion (top), and the temperature difference from the arc tube becomes large. Even if it becomes longer, the mercury vapor pressure in the arc tube can be maintained within a predetermined range.

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

  FIG. 2 is a longitudinal sectional front view of a light bulb shaped fluorescent lamp showing a second embodiment of the present invention. Note that the same parts as those in FIG.

  A light bulb shaped fluorescent lamp 23 shown in FIG. 2 includes a light emitting tube 24 instead of the light emitting tube 2 in the light bulb shaped fluorescent lamp 1 shown in FIG. The arc tube 24 is formed by connecting three U-shaped tubes 25, 26, and 27 having the same shape and size by the joint portions 10 and 10 so that the end faces of the both ends are located at the sides of substantially equilateral triangles. The valve 28 is provided. Through holes (not shown) corresponding to both ends of the U-shaped tubes 25, 26, 27 are formed in the bottom 4 b of the support member 4, and the U-shaped tubes 25, 26, 27 are formed in the through holes. The both ends of each are fixed by an adhesive.

  The narrow tube 13 is connected to the top portion 26 a of one U-shaped tube 26. The arc tube 24 is formed so that the maximum diameter D1 in the direction orthogonal to the longitudinal direction of the bulb 28 is 30 mm or less, for example, 28 mm.

  By forming the coldest spot (coldest part) on one end side (tip part) 13b of the thin tube 13, the mercury vapor pressure in the arc tube 24 (bulb 28) is maintained within a predetermined range. The U-shaped tubes 25, 26 and 27 of the arc tube 24 are connected to the substantially equilateral triangle, so that substantially uniform visible light is emitted in the entire circumferential direction of the globe 6.

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

  FIG. 3 is a longitudinal sectional front view of a light bulb shaped fluorescent lamp showing a third embodiment of the present invention. Note that the same parts as those in FIG.

  The bulb-type fluorescent lamp 29 shown in FIG. 3 is the same as the bulb-type fluorescent lamp 1 shown in FIG. 1A. For example, three U-shaped tubes 30, 31, 32 having a tube outer diameter of 6 mm are connected by joint portions 10, 10. The arc tube 34 is formed so that the maximum diameters D1 and D2 in the direction orthogonal to the longitudinal direction of the bulb 33 are, for example, 24 mm or less. The narrow tube 13 is connected to the top 31 a of the U-shaped tube 31.

  The globe 35 covering the arc tube 34 has a maximum outer diameter D3 of the opening end 35a of, for example, 30 mm or less, and has a shape similar to a general lighting bulb.

  The support member 36 is formed in the same manner as the support member 4 shown in FIG. 1, and the bottom 36 b side to which the arc tube 34 is fixed with an adhesive is inserted into the globe 35 from the opening end 35 a side of the globe 35. It is formed in a size that can be done. And the board | substrate 37 is arrange | positioned in the collar part 36a. The circuit board of the lighting circuit 3 is provided on the substrate 37.

  The flange portion 36 a side of the support member 36 and the opening end portion 35 a side of the globe 35 are inserted into the opening end side 5 aa of the base shell portion 5 a of the base 5. At least the engaging claw 36 a of the support member 36 and the opening end 35 a of the globe 35 are fixed by an adhesive 38. That is, the base 5 has the support member 36 directly fixed to the opening end side 5aa of the base shell portion 5a, and the globe 35 is directly attached.

  The maximum diameter D1 of the arc tube 34 is formed to be, for example, 24 mm or less, and the supporting member 36 and the globe 35 are directly fixed to the opening end side 5aa of the base shell portion 5a, thereby reducing the size of the bulb-type fluorescent light. A lamp 29 is provided.

  Due to the restriction of the maximum diameter D1 of the arc tube 34, the outer diameters of the U-shaped tubes 30, 31, 32 are 6 mm, for example, smaller than the U-shaped tubes 7, 8, 9 shown in FIG. As the amount of heat generated increases, the temperature of the U-shaped tubes 30, 31, 32 (valve 33) rises higher than that of the U-shaped tubes 7, 8, 9 (valve 11) shown in FIG.

  Here, the narrow tube 13 extends a predetermined length, for example, 8 to 10 mm from the top portion 31 a of the U-shaped tube 31, separates one end side (tip portion) 13 b from the discharge path, and contacts the inner surface of the globe 35 on the top portion 35 a side. Or close. Therefore, even if the temperature of the U-shaped tubes 30, 31, 32 (valve 33) rises, the temperature on the one end side (tip portion) 13 b becomes close to the temperature of the globe 35. One end side 13b of the narrow tube 13 is the coldest spot (coldest part) of the bulb 33 (the arc tube 34), and the mercury vapor pressure in the bulb 35 is set within a predetermined range according to its own temperature and the temperature of the bulb 33. Control. Thereby, the fall of the luminous efficiency of the arc_tube | light_emitting_tube 34 is suppressed.

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

  FIG. 4 is a longitudinal sectional front view of a light bulb shaped fluorescent lamp showing a fourth embodiment of the present invention. Note that the same parts as those in FIG.

  A bulb-type fluorescent lamp 39 shown in FIG. 4 is provided with a heat conductive material 40 on the inner surface of the globe 6 on the top 6b side in the bulb-type fluorescent lamp 1 shown in FIG. One end side (tip end) 13b of the thin tube 13 is covered. That is, one end side (tip portion) 13 b of the thin tube 13 is connected to the inner surface on the top portion 6 b side of the globe 6 through the heat conductive material 40.

  The viscous heat conductive material 40 is dropped on the inner surface of the globe 6 on the top portion 6 b side, and the globe 6 is attached to the lower surface of the cover body 18 a of the cover 18. At this time, one end side (tip portion) 13 b of the thin tube 13 is embedded in the heat conductive material 40. Then, as the heat conductive material 40 is solidified, one end side (tip portion) 13a of the thin tube 13 is fixed to the inner surface of the globe 6 on the top portion 6b side. The heat conductive material 40 is, for example, a transparent silicone resin.

  When the arc tube 2 is lit, the temperature of the bulb 11 rises and the temperature of the narrow tube 13 rises due to the heat from the bulb 11. The heat of the narrow tube 13 is transferred to the globe 6 through the heat conductive material 40 and is released from the globe 6 to the outside air. Thereby, the temperature of the one end side (tip part) 13a of the thin tube 13 is closer to the temperature of the globe 6 than when the thermally conductive substance 40 is not interposed, and the temperature at the coldest spot (coldest part temperature). Is optimized.

  By optimizing the coldest part temperature, the mercury vapor pressure in the bulb 11 (the arc tube 2) is maintained within a predetermined range. Thus, a decrease in luminous efficiency of the arc tube 2 at the time of lighting is further suppressed and stable visible light is emitted from the arc tube 2 than when the heat conductive material 40 is not interposed.

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

  FIG. 5 is a longitudinal sectional front view of a light bulb shaped fluorescent lamp showing a fifth embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the part equivalent to the same part and FIG. 1 as FIG. 1, and description is abbreviate | omitted.

  A bulb-type fluorescent lamp 41 shown in FIG. 4 is the same as the bulb-type fluorescent lamp 1 shown in FIG. 1B, but a hole 42 as a small hole is formed on the top 6b side of the globe 6, One end side (tip portion) 13b of 13 is extended. The hole 42 is formed to be somewhat larger than the tube outer diameter (for example, 2 mm) of the thin tube 13, and exposes one end side (tip portion) 13b of the thin tube 13 to the outside air. Here, one end side (tip portion) 13 b of the thin tube 13 is not projected outward from the outer surface of the globe 6. That is, the narrow tube 13 is disposed in the globe 6 inside the hole 42.

  Since one end side (tip portion) 13b of the narrow tube 13 is exposed to the outside air through the hole 42, the heat of the narrow tube 13 is directly released to the outside air. One end side (tip portion) 13b is separated from the discharge path of the arc tube 2 by a predetermined length. Thereby, the temperature of the one end side (front-end | tip part) 13b of the thin tube 13 falls, and the coldest spot location (coldest part) of appropriate coldest part temperature is formed.

  And the mercury vapor pressure in the bulb | bulb 11 (luminous tube 2) is maintained in a predetermined range by optimizing the coldest part temperature of the one end side (tip part) 13b of the thin tube 13. FIG. Thus, a decrease in luminous efficiency of the arc tube 2 during lighting is further suppressed than when the hole 42 is not formed, and stable visible light is emitted from the arc tube 2.

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

  6 and 7 show a sixth embodiment of the present invention. FIG. 6 is a partially cut schematic front view of a lighting fixture, and FIG. 7 is a partially cut schematic front view of another lighting fixture. Note that the same parts as those in FIG.

  A lighting fixture 43 shown in FIG. 6 is a hanging type lighting fixture that is suspended from a ceiling 44, and the bulb-type fluorescent lamp 1 or a general lighting bulb is attached to a fixture main body 45 having a bottomed cylindrical shape. A light bulb socket 46 is provided. The instrument body 45 is connected to a power cord 48 having a hooking sealing cap 47 at the tip.

  The hook ceiling cap 47 is attached to a hook ceiling body 49 disposed on the ceiling 44. As a result, external power is supplied to the socket for light bulb 46 via the power cord 48 and the like. The hook sealing cap 47 and the hook sealing body 49 are covered with a sealing cover 50. The light bulb shaped fluorescent lamp 1 is attached to a light bulb socket 46 in place of a general light bulb.

  Since the light bulb-type fluorescent lamp 1 also outputs light from the base portion of the globe 6 close to the base 5, the whole light bulb-type fluorescent lamp 1 appears to emit light. Therefore, it is suppressed that it looks dazzling when the light bulb-type fluorescent lamp 1 is visually recognized. Moreover, the instrument main body 45 side in which the bulb socket 46 is disposed can be illuminated by the radiated light from the root portion.

  Moreover, the lighting fixture 51 shown in FIG. 6 is a downlight embedded in the ceiling 44, and either the light bulb-shaped fluorescent lamp 1 or the general lighting bulb is attached to the fixture main body 52 having a bottomed cylindrical shape. A light bulb socket 53 is provided. The instrument body 52 is fixed to the ceiling 44 with the ceiling 44 sandwiched between a cover body 54 and plate springs 55, 55 provided integrally with the instrument body 52. The light bulb shaped fluorescent lamp 1 is attached to the light bulb socket 53 instead of the general illumination light bulb.

  The emitted light from the bulb-type fluorescent lamp 1 is emitted directly from the opening 56 of the cover body 54 to the lower surface side as direct light and reflected light reflected from the inner surface of the instrument body 52. And the radiated light from the base part close | similar to the nozzle | cap | die 5 of the globe 6 is reflected by the inner surface of the back | inner side of the instrument main body 52, and is radiate | emitted from the opening 56 of the cover body 54. FIG.

  Since the light-emitting fluorescent lamp 1 emits radiated light from the globe 6 to the base portion close to the base 5, it is possible to obtain a light distribution characteristic close to that of a general lighting bulb. Further, one end side (tip portion) 13b of the narrow tube 13 connected to the top portion 8a of the U-shaped tube 8 becomes the coldest spot (cold portion), and the mercury vapor pressure in the arc tube 2 is controlled within a predetermined range. Therefore, brightness (luminous flux) substantially equivalent to that of a general lighting bulb can be obtained by suppressing a decrease in luminous efficiency during lighting.

BRIEF DESCRIPTION OF THE DRAWINGS It is a lightbulb-type fluorescent lamp which shows the 1st Embodiment of this invention, (a) is a longitudinal cross-section front view, (b) is a vertical cross-section side view. The longitudinal cross-sectional front view of the lightbulb-type fluorescent lamp which shows the 2nd Embodiment of this invention. The longitudinal cross-sectional front view of the lightbulb-type fluorescent lamp which shows the 3rd Embodiment of this invention. The longitudinal cross-sectional front view of the lightbulb-type fluorescent lamp which shows the 4th Embodiment of this invention. The longitudinal cross-sectional front view of the lightbulb-type fluorescent lamp which shows the 5th Embodiment of this invention. The partial notch schematic front view of the lighting fixture which shows the 6th Embodiment of this invention. Similarly, the partially cut away schematic front view of another lighting fixture.

Explanation of symbols

1,23,29,39,41 ... bulb-shaped fluorescent lamp
2, 24, 34 ... arc tube
3 ... Lighting circuit
4, 36 ... support member
5 ... Clasp
6,35 ... Glove
40: Conductive substance
42: Hole as small hole
43, 51 ... Lighting equipment
45, 52 ... Lighting equipment body

Claims (4)

It has a valve that connects a plurality of U-shaped tubes with a tube outer diameter of 3 to 8 mm, and is formed so that the maximum diameter in the direction perpendicular to the longitudinal direction of this valve is 30 mm or less. An arc tube having a capillary connected to at least one top of the tube;
A lighting circuit for lighting the arc tube;
A support member for supporting the arc tube;
A base having a base shell portion that houses at least a part of the lighting circuit, and a support member fixed directly or indirectly to the opening end side of the base shell portion;
A glove that is directly or indirectly attached to the base so as to cover the arc tube, and has a maximum outer diameter of an opening end of 35 mm or less;
A bulb-type fluorescent lamp characterized by comprising:   The bulb-type fluorescent lamp according to claim 1, wherein the thin tube connected to the top of the U-shaped tube is connected to the inner surface side of the globe via a heat conductive material.   3. The light bulb shape according to claim 1, wherein a small hole is formed in the globe, and a thin tube connected to the top of the U-shaped tube is disposed inside the small hole. Fluorescent lamp. A bulb-type fluorescent lamp according to any one of claims 1 to 3;
An instrument body having a light bulb socket to which the light bulb shaped fluorescent lamp is mounted;
The lighting fixture characterized by comprising.

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