JP2005285478A - Compact self-ballasted fluorescent lamp and lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact self-ballasted fluorescent lamp wherein the an arc tube protrusion is protruded toward the base side, and two or more smoothing electrolytic capacitors are housed in a space having comparatively low temperatures to prevent them from being damaged by mutual contact, and a lighting system equipped with the compact self-ballasted fluorescent lamp. <P>SOLUTION: Since an arc tube protrusion extended in a cover body is positioned in a region in the direction on which two lead wires to support the adjacent smoothing electrolytic capacitors are provided side by side, the arc tube protrusion can be prevented from being broken or cracked by mutual contact with the capacitors. In addition, the compact self-ballasted fluorescent lamp having excellent luminous flux build-up characteristics can be obtained. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bulb-type fluorescent lamp and a lighting device including a high-frequency lighting device having at least two smoothing electrolytic capacitors.

  Light bulb-type fluorescent lamps have been reduced in size to the extent equivalent to general incandescent light bulbs, and are almost meeting the demand for replacing light sources of general incandescent light bulbs with light bulb-type fluorescent lamps.

  The bulb-type fluorescent lamp thus miniaturized has improved lamp efficiency due to the development of lamp technology and lighting circuit technology. In general, an electrolytic capacitor having a relatively large shape and a low heat-resistant temperature is used as an indispensable component for a high-frequency lighting device (inverter) for lighting a bulb-type fluorescent lamp. However, the bulb-type fluorescent lamp has a smaller surface area as it becomes smaller, and has become so hot that it exceeds the heat resistance temperature of the electric parts used. Therefore, a smoothing electrolytic capacitor that smoothes the pulsating rectified voltage is greatly related to the life of the lighting device. Therefore, the lead wire for supporting the smoothing electrolytic capacitor is extended and separated from the fluorescent lamp at a relatively high temperature. It is accommodated in the cylindrical part of the cover body having a low height.

  In addition, in order to respond to market demands for further miniaturization and higher efficiency, there is a tendency to reduce the lamp tube diameter and increase the lamp discharge path length. When the lamp voltage exceeds a predetermined voltage value obtained from the above, it is difficult to maintain the lamp. For this reason, it is necessary to increase the smooth DC voltage input to the inverter or increase the inverter output voltage. In order to increase the inverter output voltage, it is conceivable to use a transformer as the boosting means. However, using a transformer such as an autotransformer is contrary to the purpose because it causes an increase in size and a decrease in efficiency.

From such a technical background, a bulb-type fluorescent lamp that efficiently accommodates an electrolytic capacitor using a voltage doubler rectifier circuit system using two or more electrolytic capacitors has been disclosed (for example, see Patent Document 1).
JP 2000-106028 A

  However, when the bulb-type fluorescent lamp described in Patent Document 1 is lit in a high temperature environment and the arc tube is covered with a glove in order to have an appearance similar to a general incandescent bulb, the temperature of the arc tube exceeds 100 ° C. It may end up. In addition to using the voltage doubler rectifier circuit system, the heat-resistant temperature can be ensured while accommodating the smoothing capacitor in the cover body in a compact manner. However, since it becomes high temperature during lighting, it is difficult to use pure mercury. Therefore, instead of mercury, it is necessary to seal the amalgam, which is an alloy with mercury, in an arc tube and control the mercury vapor pressure to be low, thereby improving luminous efficiency. In such a bulb-type fluorescent lamp encapsulating amalgam in this way, the conventional mercury vapor can be obtained by projecting the protruding portion of the arc tube toward the base side and setting the temperature to a portion having a mercury vapor pressure that maximizes the luminous efficiency. As compared with the case where an amalgam having a low pressure is used, a proposal has been made that the light beam rise characteristic immediately after lighting is improved and that the light emission efficiency during lighting is suppressed from being lowered.

  The bulb-type fluorescent lamp having the arc tube projection extended to the base side in this way is a smooth electrolytic capacitor disposed on the base side inside the long arc tube projection and the cover body when vibration is applied during transportation or handling. Collide with each other and cracks are likely to occur in the protruding portion of the arc tube.

The present invention has been made in view of the above problems. In a lamp in which an arc tube protruding portion protrudes toward the base and two or more smoothing electrolytic capacitors are accommodated in a relatively low temperature space, An object of the present invention is to provide a light bulb-type fluorescent lamp in which damage due to contact is suppressed and a lighting device including the light bulb-type fluorescent lamp.

  The bulb-type fluorescent lamp according to claim 1 is an arc tube having a bent bulb; and a capacitor body and a pair of lead wires provided on one end face of the body on a substrate, for two or more relatively tall flats A lighting device that mounts electrical components including an electrolytic capacitor and outputs high-frequency power to light the arc tube; a base is provided in a cylindrical portion formed in a cylindrical shape on one end side, and light is emitted on the other end side A cover body having a holding portion for holding the tube, and housing the lighting device while positioning at least two smoothing electrolytic capacitors among the electric parts in the cylindrical portion; and communicating with the inside of the bent valve and of the bent valve A tip portion extending from at least one end portion is located in the base-side cylindrical portion in the cover body, and the tip portion is a pair of lead wires of at least one smoothing electrolytic capacitor disposed adjacent to each other. Those that include a; and a light emitting tube protruding portion disposed juxtaposed direction of the capacitor body region.

  The bulb-type fluorescent lamp according to claim 2 is mounted with a plurality of electrical components including an arc tube having a bent bulb and two or more relatively smooth electrolytic capacitors having a pair of lead wires on a substrate. A lighting device that outputs high-frequency power to light the arc tube; a cap is provided in a cylindrical portion formed in a cylindrical shape on one end side, and a holding portion that holds the arc tube on the other end side A cover body containing the lighting device while disposing at least two smoothing electrolytic capacitors among the electric parts in the cylindrical portion; communicating with the inside of the bent valve and extending from one end of the bent valve And an arc tube protruding portion positioned in the cylindrical portion of the cover body together with the smoothing electrolytic capacitor, and an electric component and an arc tube protruding portion positioned in the cylindrical portion of the cover body, Electrical component And it is characterized in that it is arranged a light emitting tube protruding portion at a position away from falling down in a direction substantially perpendicular virtual plane including the pair of lead wires.

  As long as the lighting device has at least two or more smoothing electrolytic capacitors, the circuit configuration is not limited, and any circuit configuration can be adopted. For example, what is comprised from the diode bridge which carries out full wave rectification of commercial power supply, a voltage doubler rectifier circuit, a half bridge type inverter, etc. is mentioned.

  The smoothing electrolytic capacitor includes a case body covering an impregnating element formed in a substantially cylindrical shape, and a pair of lead wires for supporting the case body provided on one end surface of the case body.

  Since the electrolytic capacitor for smoothing has a relatively low heat-resistant temperature, it needs to be separated from the fluorescent lamp which is a heat source during lighting. Further, since the electrolytic capacitor for smoothing is a relatively large component, it is necessary to arrange it in the direction of the central axis having the space in the height direction in order to be compactly accommodated in the substantially conical cover body. Therefore, it can be efficiently accommodated in a limited space in the cover body by being accommodated in the cylindrical portion located above the cover body in a state of being erected in the central axis direction of the cover body, and is also affected by the heat of the fluorescent lamp. It becomes suppressed that it becomes high temperature.

  Furthermore, in order to improve the luminous flux rise characteristics, it is necessary to lower the amalgam temperature or the coldest part temperature at the time of stable lighting, so by extending the arc tube protruding part to be located on the lighting device side, The mercury vapor pressure is close to that of pure mercury, and the mercury vapor pressure during stable lighting can be controlled to an appropriate value.

  The smoothing electrolytic capacitor and the arc tube protruding portion are located in the base-side cylindrical portion. It is not necessary that all the cases constituting the smoothing electrolytic capacitor are arranged in the cylindrical portion, and they are formed on one end surface of the case body. It includes those in which only the safety valve portion is disposed in the cylindrical portion. Furthermore, even if the straight tube portion of the arc tube protruding portion is not disposed in the cylindrical portion, only the tip, that is, the sealing portion, needs to be positioned in the cylindrical portion.

  When the product of the outer diameters of the two or more smoothing electrolytic capacitors and the arc tube protrusions is smaller than or equal to the inner diameter of the cover cylindrical part, the cover connecting the central axis is a straight line. It can be placed in the body cylinder. However, when the product of the outer diameters of the two or more smoothing electrolytic capacitors and the arc tube projection is larger than the inner diameter of the cover cylindrical portion, the respective central axes are arranged so as to be located at respective points of the polygon. It will be. As described above, the positional relationship is not particularly limited as long as the smoothing electrolytic capacitor and the arc tube protruding portion can be arranged in the cover body cylindrical portion.

  The arc tube protrusion is disposed in the capacitor body region in the direction in which the two lead wires for mounting the smoothing electrolytic capacitor on the circuit board are aligned. In this case, it is on a straight line connecting two (a pair of) lead wires, and the region indicates a region including the width of the case body constituting the electrolytic capacitor. In short, in a cross-sectional view of the smoothing electrolytic capacitor, it means that the arc tube protrusion is located on the line region in the width direction of the electrolytic capacitor extending in the direction connecting the two lead wires supporting the electrolytic capacitor. When the region on the straight line connecting the pair of lead wires that support the electrolytic capacitor deviates from the region, the electrolytic capacitor supported by the relatively long lead wire falls. Therefore, among the two or more smoothing electrolytic capacitors, at least the smoothing electrolytic capacitor adjacent to the arc tube projection and the arc tube projection need to have the above relationship. That is, when the arc tube protrusion is disposed in a direction in which the electrolytic capacitor is easy to fall, which is a planar direction including a pair of lead wires of the electrolytic capacitor, it tilts while deforming into a thin and long arc tube protrusion due to mutual contact, There is a risk that the arc tube protrusion may be damaged due to the pressure. Therefore, the arc tube protrusion has a virtual plane direction including at least two lead wires of the smoothing electrolytic capacitor adjacent to the arc tube protrusion, that is, a direction in which the arc tube protrusion easily falls down substantially perpendicular to the virtual plane including the two lead wires. It is necessary to avoid the position.

  In addition, the arc tube protrusion needs to lower the amalgam temperature or the coldest part temperature at the time of stable lighting in order to improve the luminous flux rise characteristic, so the tip is extended to a relatively low temperature region on the lighting device side. It is necessary to exist. As a result, it is possible to use a mercury vapor pressure that is close to that of pure mercury immediately after lighting, and that can control the mercury vapor pressure during stable lighting to an appropriate value. In addition, in a lamp in which an amalgam is enclosed in the protruding portion of the arc tube, it is preferable to arrange the auxiliary amalgam in the arc tube in order to compensate for mercury vapor diffusion immediately after lighting. As long as the arc tube is configured under the condition that moderate mercury vapor diffusion occurs in the tube, the tube may contain only amalgam.

  The cover body has a cylindrical portion to which the base is attached at one end, and a holding body that holds the arc tube at the other end opposite to the direction in which the base is attached. It has the shape of a substantially conical rotator that is extended in the shape of a lamp, and has a substantially conical lighting device housing space. The holding body is preferably a separate structure from the cover body as a holder having a shape into which the end of the arc tube can be inserted, but may be an integral structure with the cover body.

  The bent bulb that constitutes the arc tube held by the cover body is formed into a U-shaped bent shape by heating and melting the central part of the straight tubular glass bulb and bending or molding the glass bulb. Is done. Here, “bently formed in a U shape” means that the glass bulb is formed such that the discharge path is folded at the bent portion and the discharge is bent, and the bent portion is curved or circular. It is not limited to those formed in an arc shape, and includes a shape in which a bent portion is formed in a square shape or a sharp shape. In short, it means a bulb formed so that one ends of the straight portions are continuous so that the discharge path is bent. Further, the bent valve may be connected by a communication pipe formed by blowing one end of two substantially parallel straight portions, or may be formed in a spiral shape. The bending valve may not be made of glass, and is allowed to be formed of a material such as ceramic that can form a light-transmitting airtight container.

  The arc tube is composed of a single bent bulb, and the glass bulbs communicate with each other so that at least one discharge path is formed inside by connecting the ends of a plurality of bent bulbs via a communicating tube. It may be arranged in parallel.

  When the linear portions constituting each bulb are arranged on the circumference and arranged in parallel, the arc tube projections that project from the bulb ends project from the circumferential direction of the circuit board toward the base side. become. The space inside the cover that accommodates the protruding portion that protrudes from the circumferential direction of the circuit board toward the base side has a substantially conical rotating body shape, so that the height of the circle center portion of the circuit board, that is, the vicinity of the base The distance in the height direction becomes the maximum, and the dimension in the height direction becomes smaller as it goes in the circumferential direction of the circuit board. Therefore, in order to separate the narrow tube protruding from the bulb end from the arc tube as a heat source and extend to the vicinity of the mouthpiece of the cover body space, the narrow tube protruding from the circumferential direction of the circuit board should not be brought into contact with the cover body wall. In addition, it is necessary to bend toward the center of the circle. However, in the case where the arc tube end portion is formed so as to be in the direction of the cover body central axis, it is not necessary to bend the protruding portion protruding from the end portion.

  A phosphor layer is applied directly or indirectly to the inner surface of the arc tube. Examples of the phosphor layer include, but are not limited to, rare earth metal oxide phosphors and halophosphate phosphors. However, in order to improve luminous efficiency, it is preferable to use a three-wavelength emission type phosphor in which phosphors emitting red, blue and green light are mixed.

  In the arc tube, electrodes are sealed at both ends of a discharge path formed in the arc tube. Examples of the electrode include a hot cathode made of a filament, a ceramic electrode carrying an electron emitting material, and a cold cathode made of nickel.

  A discharge medium is sealed inside the arc tube. The discharge medium is made of an inert gas such as argon, neon, krypton, or xenon and mercury.

  The protruding portion of the arc tube may be the same diameter as the inner diameter of the arc tube, may be smaller than the arc tube, or may have a small diameter glass bulb, that is, a thin tube sealed to the end of the arc tube. Good. Furthermore, the part where the end of a part of the valve extends may be used for enclosing the main amalgam or may be used as an exhaust pipe.

  As the base, a screw-in type called an E-type for an incandescent lamp is usually used, but it is not limited to this. Further, the base need not be directly attached to the cover body, but may be indirectly attached to the case or a part of the cover body may constitute the base.

  According to the first and second aspects of the present invention, the arc tube protrusions extending into the cover body are located in the juxtaposed direction region of the two lead wires that support the adjacent smoothing electrolytic capacitor, and thus are mutually connected. It is possible to suppress the occurrence of breakage or cracking of the arc tube protrusion due to contact with the light source. In addition, since the arc tube protrusion is disposed at a position that avoids falling in a direction substantially orthogonal to a virtual plane including two lead wires that support the adjacent smoothing electrolytic capacitor, the arc tube protrusion Damage can be suppressed. Furthermore, it is possible to provide a bulb-type fluorescent lamp having a good luminous flux rising characteristic.

  According to a third aspect of the present invention, in the bulb-type fluorescent lamp, all the lead wires and the arc tube protrusions for mounting the electrolytic capacitor for smoothing the bulb-type fluorescent lamp according to the first or second embodiment are arranged on the same straight line. It is characterized by this.

  All lead wires and arc tube projections for mounting the electrolytic capacitor for smoothing are arranged on a straight line. The arc tube projections are positioned on an extension of at least four lead wires in the juxtaposition direction. Indicates that Furthermore, the straight line and the width direction of the straight line include the inside of the width region of the case body constituting the electrolytic capacitor. In short, it means that the arc tube protrusion is located on the width line of the electrolytic capacitor extending in the direction connecting the four lead wires supporting two or more smooth electrolytic capacitors.

  According to the light bulb shaped fluorescent lamp of claim 3, in addition to the effects of claim 1 or 2, since all the lead wires of the smoothing electrolytic capacitor and the arc tube protrusions are arranged on the same straight line, Even if the part and the electrolytic capacitor come into contact with each other during assembly or transportation, it is possible to further suppress tilting while easily deforming in a straight direction connecting the lead wires. Therefore, since it is difficult to give stress to the arc tube protrusion, it is possible to suppress breakage and occurrence of cracks.

  According to a fourth aspect of the present invention, there is provided an illuminating device comprising: the fluorescent lamp according to any one of the first to third aspects; and an instrument body on which the fluorescent lamp is mounted.

  According to the illuminating device of the fourth aspect, it is possible to provide an illuminating device having the action of the bulb-type fluorescent lamp according to any one of the first to third aspects.

  Hereinafter, a bulb-type fluorescent lamp according to a first embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a partial cross-sectional view showing a light bulb-type fluorescent lamp according to the present embodiment, FIG. 2 is a schematic diagram showing the positional relationship between a smoothing electrolytic capacitor and a light emitting tube protrusion in the cylindrical part of the cover body in FIG. These are the schematic diagrams which show another positional relationship of the electrolytic capacitor for smoothing in a cover body cylindrical part, and an arc_tube | light_emitting_tube protrusion part.

  As shown in FIG. 1, the bulb-type fluorescent lamp of the present embodiment includes an arc tube 10, a thin tube 11 as an arc tube projection, a cover body 20, a lighting device 30, and a globe 40. . The cover body 20 includes a cover body 21, a cylindrical portion 22 with a cap 50 on one end side of the cover body 21, and a holder 23 as a holding portion provided on the other end side of the cover body 21. Yes.

  The cover body 21 and the holder 23 are made of a heat-resistant synthetic resin such as polybutylene terephthalate (PBT). The cover body 21 has a substantially conical rotator shape extending from the upper end to the lower end so as to expand, and a cylindrical portion 22 is integrally provided at the upper end. The cylindrical portion 22 on the upper end side of the cover body 21 is covered with a cap 50 and fixed by adhesion or caulking. Further, the inside of the cover body 20 has a lighting device housing space formed in a substantially conical shape.

  The envelope composed of the cover body 20 and the globe 40 is formed in an outer shape that approximates the standard size of a general lighting bulb such as an incandescent bulb having a rated power equivalent to the 60 W type. That is, the height H1 including the base 50 is about 110 to 125 mm, the diameter, that is, the outer shape D1 of the globe 40 is about 50 to 60 mm, and the outer shape D2 of the cover body is about 40 mm. The general lighting bulb is defined in JIS C 7501.

  A holder 23 that is an arc tube fixing member and a lighting device fixing member is attached to the other end of the cover body 21. This holder has an arc tube insertion portion through which an end of the arc tube 10 (not shown) can be inserted. The arc tube 10 is attached to the holder 23, and the holder 23 is attached to the cover body 21 so as to cover the opening of the cover body 21. A circuit board 31 constituting the lighting device 30 is attached to the holder 23 by fitting means (not shown).

  The lighting device 30 includes a substrate 31 disposed substantially perpendicular to the central axis of the base 50 and a plurality of electrical components 32 mounted on the substrate 31, and an inverter circuit (high-frequency lighting circuit) that performs high-frequency lighting. Is configured.

  The lighting device 30 is electrically connected to the base 50 and the arc tube 10 and operates by being supplied with power through the base 50 to output high-frequency power, and this output is applied to the arc tube 10 for lighting. .

  The substrate 31 is substantially disk-shaped and has a diameter (maximum width dimension) that is 1.2 times or less the maximum width of the arc tube 10. On one surface of the substrate 31 on the base 50 side, most of the electrical components 32 including a smoothing 32a electrolytic capacitor, an inductor, a transformer, a resistor, a film capacitor, and the like are mounted. The two smoothing electrolytic capacitors 32a and 32b are erected substantially at the center of the substrate 31 in a state where they are electrically connected to other electrical components 32 via a pair of lead wires 33a and 33b, respectively. Note that all the lead wires 33a, 33b that support the smoothing electrolytic capacitors 32a, 32b are arranged on substantially the same straight line in a sectional view, and the upper half of the case body constituting the electrolytic capacitors 32a, 32b is the cover body. It is located in 20 cylindrical portions 22.

  Further, the substrate 31 is formed with an insertion portion 31a formed in a sector shape so that the thin tubes 11 can be communicated with each other. The thin tube insertion portion 31a is located in a region in which all the lead wires 33a and 33b of the two smoothing electrolytic capacitors 32a and 32b mounted on the circuit board 31 are arranged in parallel.

  On the other surface of the substrate 31 on the arc tube 10 side, a small electronic element having a relatively low heat temperature such as a field effect transistor (FET), a rectifier diode (REC), and a chip resistor is mounted.

  The upper part of the case body of the smoothing electrolytic capacitors 32a and 32b protrudes toward the base 50 side from the electrical component 32 that generates a relatively large amount of heat, such as a current limiting inductor, transformer, resistor, and resonant capacitor, and is located in the cylindrical portion 22. ing.

  The globe 40 is translucent or milky white having light diffusibility or the like. The globe 40 is formed of glass, synthetic resin, or the like into a smooth curved surface that is substantially the same shape as a glass bulb of a general lighting bulb. The globe 40 is enclosed in the arc tube 10 and attached to the other end side of the cover body 20 with an opening fitted to the other end side of the cover body 20. Note that the globe 40 can be combined with another member such as a diffusion film to improve luminance uniformity.

On the inner surface of the arc tube 10, an alumina (Al ₂ O ₃ ) protective film (not shown) and a phosphor layer (not shown) are formed thereon. The phosphor layer is composed of, for example, a three-wavelength phosphor that is a mixture of phosphors that emit red, blue, and green light. Examples of the red light emitting phosphor include europium activated yttrium oxide phosphor (Y ₂ O ₃ : Eu ³⁺ ) having a peak wavelength in the vicinity of 610 nm. Examples of the blue light emitting phosphor include europium activated barium magnesium aluminate / magnesium light emitter (BaMg ₂ Al ₁₆ O ₂₇ : Eu ²⁺ ) having a peak wavelength near 450 nm. Examples of the green light emitting phosphor include a cerium / terbium activated lanthanum phosphate phosphor ((La, Ce, Tb) PO ₄ ) having a peak wavelength in the vicinity of 540 nm. In addition to the above phosphors that emit red, blue, and green light, the three-wavelength phosphors are mixed with phosphors that emit other colors and are prepared to emit light with the desired chromaticity. May be. The luminous body layer of the arc tube is formed by coating after the bending bulbs 10a, 10b, and 10c described later are formed.

  The arc tube 10 includes a plurality of, for example, three bent bulbs 10a, 10b, and 10c having substantially the same outer shape. These bending bulbs 10a, 10b, 10c are arranged at predetermined positions and are sequentially connected via a connecting tube, thereby forming one discharge path.

  Each of the three bent valves 10a, 10b, and 10c is formed in a U shape having a pair of straight pipe portions that are substantially parallel to each other and a curved pipe portion that connects one end of the straight pipe portions. These bending valves 10a, 10b, and 10c are arranged in such a way that their straight pipe portions are positioned on the circumference, and are formed into a triple U shape in which three bent pipe portions form a triangular shape. In addition, you may form so that a bending pipe part may make square shape using four bending | flexion valves.

  Each of the bent valves 10a, 10b, and 10c is made of lead-free glass having a tube outer diameter of about 11 mm, a tube inner diameter of about 9.4 mm, and a wall thickness of about 0.8 mm. Is bent so as to be smoothly curved. The bent parts of the bent valves 10a, 10b, and 10c are bent by heating the middle part of the straight tube glass valve, and then the bent portions of the bent valves 10a, 10b, and 10c are put into a mold and the inside of the valve is pressurized. Thus, it is formed into a desired shape. Depending on the shape of the mold, it is possible to arbitrarily shape the bent tube portion.

  In addition, it is preferable that the pipe | tube outer diameter of bending valve | bulb 10a, 10b, 10c shall be 9.0-13 mm, and valve | bulb thickness shall be 0.5-1.5 mm. Further, the discharge path length of the arc tube 10 is preferably in the range of 250 to 500 mm, and the lamp input power is preferably 8 to 25 W. The bending valve is easily deformed due to heating or flashing temperature difference in the manufacturing process, and the condition that the mechanical strength of the communication pipe is weak depends greatly on the relationship between the outer diameter and the wall thickness of the glass bulb to be used. When the outer diameter of the tube is smaller than 9.0 mm or when the wall thickness is smaller than 0.5 mm, the arc tube itself is easily damaged based on factors other than the deformation of the bent bulb, which is not preferable. Moreover, when the pipe outer diameter exceeds 13 mm or the wall thickness exceeds 1.5 mm, the mechanical strength of the communication pipe can be ensured to some extent. An arc tube using a glass bulb having a tube outer diameter of 9.0 to 13 mm and a wall thickness of 0.5 to 1.5 mm should be designed with a discharge path length of 250 mm to 500 mm and a lamp input power of 8 to 25 W. Thus, it is possible to configure a bulb-type fluorescent lamp that approximates the shape of an incandescent bulb. Further, as a result of examining the lighting region in which the lamp efficiency of the arc tube is improved by increasing the discharge path length, if the discharge path length is in the range of 250 to 500 mm and the lamp input power is in the range of 8 to 25 W, the lamp efficiency Is particularly improved.

In order to facilitate heating processing of bending valves, it is common practice to reduce the glass softening temperature by mixing lead components in the glass used in bending valves. However, lead components are substances that affect the environment. Therefore, it is preferable to refrain from using it as much as possible. In addition, the glass used for the bending valve contains a large amount of sodium component (Na ₂ O) as an alkali component, but this sodium component precipitates and reacts with the fluorescent substance in the heating process of the bending valve, and the phosphor becomes It may be deteriorated. Therefore, the bent valve substantially does not contain a lead component, and by making Na ₂ O 10% by mass or less, the influence on the environment can be reduced, and the deterioration of the phosphor is suppressed and the luminous flux maintenance factor is improved. It becomes possible.

The glass used for the bending valve is 60 to 75% SiO ₂ , 1 to 5% Al ₂ O ₃ , 1 to 5% Li ₂ O, 5 to 10% Na ₂ O, and K by weight ratio. ₂ O is 1 to 10%, CaO is 0.5 to 5%, MgO is 0.5 to 5%, SrO is 0.5 to 5%, BaO is 0.5 to 7%, and SrO / The composition satisfies the conditions of BaO ≧ 1.5 and MgO + BaO ≦ SrO. Although the reason is not clear by using this glass, it was confirmed that the rise of the luminous flux is improved as compared with the arc tube formed under the same conditions except that it is formed from a bent bulb using lead glass.

  The bent valves 10a, 10b, and 10c are sealed at one end by a pinch seal or the like, and at the other end, a narrow tube 11 having a tube outer diameter of 2 to 5 mm and a tube inner diameter of 1.2 to 4.2 mm is pinched. It is sealed so as to protrude from the end of the arc tube 10 by a seal or the like. The narrow tube 11 of the bent valve 10a arranged on one side is a dummy and is used for exhausting. Further, the main amalgam 60 is sealed in the narrow tube 11 as the arc tube protruding portion sealed at the end of the bent bulb 10b disposed in the middle.

  The narrow tube 11 in which the main amalgam 60 is sealed protrudes from the end of the bending valve 10b so that the tip thereof is located on the base 50 side in the cover body. The protruding length of the narrow tube 11 from the end of the bent valve 10b is preferably 15 to 50 mm. In this embodiment, the straight line protrudes at about 45 mm. The intermediate portion of the thin tube 11 has a bent portion that is bent in two directions so as to bend in a direction approaching an axis passing through the center of the base 50 and bend in a direction substantially parallel to the axis again. The distal end portion of the bent portion is disposed closer to the axis with respect to the root portion on the arc tube 10 side than the bent portion. That is, the bent portion is for extending the distal end portion toward the base 50 while bringing the distal end portion toward the axis so that the thin tube 11 does not contact the inner wall surface of the cover body 20. . The length from the end of the bending valve 10b to the tip of the thin tube 11 is about 40 mm.

  The main amalgam 60 is an alloy containing 50 to 65% by weight of bismuth (Bi) and 35 to 50% by weight of tin (Sn) as a base, and 12 to 25% by weight of mercury in the alloy. is there.

  A filament coil as an electrode (not shown) is supported by a pair of wells at one end of the bent bulbs 10a and 10c located on both sides of the arc tube 10 on the non-communication tube side. The pair of wells is connected to a wire led out of the bending valve through a jumet line sealed by a pinch seal or the like not using a mount at the ends of the bending valves 10a and 10c on both sides. Two pairs, that is, four wires led out from the arc tube 10 are electrically connected to the lighting device 30.

  An auxiliary amalgam is provided at one end of the intermediate bending valve 10b and the wells near the electrodes. The auxiliary amalgam provided in the intermediate bent valve 10b is attached to the wells sealed by a pinch seal or the like, and is arranged at an intermediate position of the discharge path.

  In the case of a 12 W class bulb-type fluorescent lamp corresponding to an incandescent bulb 60 W, it is sufficient if it can adsorb mercury having a mass of about 10 times the mass converted value of mercury that gives the optimum mercury vapor pressure in the arc tube 10. In this embodiment, the auxiliary amalgam is formed by plating about 3 mg of gold (Au) on a stainless steel substrate having a length of 2 mm, a width of 7 mm, and a thickness of 40 μm. In the present embodiment, it is preferable to use an auxiliary amalgam that does not significantly reduce the mercury vapor pressure. That is, a metal such as indium (In) is unsuitable because it has a high ability to adsorb mercury and it is difficult to release an appropriate amount of mercury vapor pressure immediately after lighting.

  Optimal materials for this type of auxiliary amalgam include gold (Au), silver (Ag), palladium (Pd), platinum (Pt), lead (Pb), zinc (Zn), bismuth (Bi), or tin ( Sn) and the like. In particular, gold (Au) and silver (Ag) are suitable from the viewpoint of mercury adsorption power.

  In this embodiment, the arc tube 10 has a bulb height of 50 to 60 mm, a discharge path length of 200 to 350 mm, and a maximum width in the bulb juxtaposition direction of 32 to 43 mm. The arc tube is filled with argon gas having a filling gas ratio of 99% or more at a filling pressure of 400 to 800 Pa.

The lighting device 30 is configured to light at a current density (current per cross-sectional area) in the arc tube of 3 to 5 mA / mm ² with a lamp power of 7 to 15 W. The bulb-type fluorescent lamp of this embodiment has an input power standard of 12 W, the arc tube is applied at a high frequency of 10.5 W, the lamp current is 190 mA, the lamp voltage is 58 V, and the total luminous flux is generated by the light output from the arc tube. It is about 810lm.

  FIG. 4 shows another possible relationship between the two electrolytic capacitors 32a and the thin tube 11 described in the first embodiment of the present invention.

  The figure is a top view of the bulb-type fluorescent lamp with the base removed. FIG. 4A shows that the thin tube 11 is on the same straight line connecting the pair of lead wires 33a and 33a of one smoothing electrolytic capacitor 32a adjacent to the thin tube 11 out of the two smoothing electrolytic capacitors 32a and 32b. The two lead wires 33b and 33b of the other smoothing electrolytic capacitor 32b are mounted so as to intersect the straight line connecting the lead wires 33a and 33a of the one smoothing electrolytic capacitor 32a and the thin tubes. Yes. FIG. 4B shows that the thin tube 11 is located on the same straight line connecting the pair of lead wires 33a and 33a of one smoothing electrolytic capacitor 32a adjacent to the thin tube 11 out of the two smoothing electrolytic capacitors 32a and 32b. Although not, it is located in the case body width region A of the smooth electrolytic capacitor 32a adjacent to the thin tube 11.

  According to such a bulb-type fluorescent lamp, all the lead wires 33a, 33b of the smoothing electrolytic capacitors 32a, 32b and the tip of the thin tube 11 are arranged in the same line, so that the thin tube 11 and the smoothing electrolytic capacitor Even if 32a and 32b come into contact during assembly or transportation, the smooth electrolytic capacitors 32a and 32b can be prevented from tilting while being easily deformed toward the narrow tube 11, and the occurrence of breakage and cracking of the narrow tube 11 can be suppressed. it can.

  Further, even in a bulb-type fluorescent lamp in which the arc tube 10 is covered with the globe 40 and becomes hot during lighting, the thin tube 11 is extended without contacting the cover body 20 via the communicating portion 31a of the circuit board 31 so as to be separated from the electrodes. By being present, the temperature formed at its tip can be kept relatively low, so the amalgam 60 sealed at the tip of the capillary 11 can be located in a relatively cold space during lighting, It becomes possible to keep the mercury vapor pressure in the arc tube 10 at a desired pressure.

  Next, a bulb-type fluorescent lamp according to a second embodiment of the present invention will be described with reference to FIG.

  FIG. 4 is a partial cross-sectional view of a bulb-type fluorescent lamp according to the second embodiment of the present invention, and FIG. 5 is a cross-sectional view of the arc tube portion. FIG. 6 is a schematic diagram showing the positional relationship between the smoothing electrolytic capacitor and the thin tube in the cylindrical portion of the cover body of FIG.

  4 to 6, the same parts as those in FIG. 1 or FIG.

  The envelope composed of the globe 40 and the cover body 20 is formed in an outer shape that approximates the standard size of a general lighting bulb such as an incandescent bulb equivalent to a rated power of 100 W. That is, the height H1 including the base 50 is about 110 to 125 mm, and the diameter, that is, the outer shape D1 of the glove is about 50 to 60 mm. The general lighting bulb is defined in JIS C 7501.

  The arc tube 10 has six U-shaped bent bulbs 10a, 10b, 10c, 10d, 10e, and 10f having substantially the same shape, arranged in a predetermined position, and sequentially connected through a communication tube. The discharge path is formed.

  The six U-shaped bent valves 10a to 10f are configured to have a tube outer diameter of 6 to 11 mm, and approximately 8.15 mm in the present embodiment. If the outer diameter of the tube exceeds 11 mm, it is difficult to reduce the size while securing a sufficient discharge path, and if it is less than 6 mm, the starting voltage increases and the lamp efficiency decreases, and it becomes difficult to manufacture.

  The height of each U-shaped bent valve 10a to 10f is about 63mm, the distance from the valve end to the communication pipe is 14mm, and the straight portion interval and each valve interval are formed to about 2.5mm. .

  The six U-shaped bent bulbs 10a to 10f have three U-shaped bent bulbs, each of which has electrodes 10a and 10f arranged on the bottom when viewed from the transverse direction so as to be orthogonal to the axial direction of the arc tube 10. Two convex bottom surfaces connected so as to form a substantially convex shape by a valve are opposed to each other, and valve ends having no electrodes located on the bottom surface are opposed to the ends of valves 10a and 10f having electrodes. 10c and 10d are connected by a connecting tube to form one 650 mm discharge path. It should be noted that one of the U-shaped bent valves 10b, 10e located at the top of the three valves connected in a convex shape and one of the two U-shaped bent valves 10a, 10c, 10d, 10f located at the bottom. Of the pair of straight portions, the connecting pipes that connect the straight portions located inside are connected so as to be substantially parallel. That is, the two bending valves 10a, 10c, 10d, and 10f located on the bottom surface and the bending valves 10b and 10e located on the top are connected substantially at right angles. The six bent valves 10a to 10f are formed so that the maximum width in the valve juxtaposition direction is 32 to 43 mm.

  A filament coil 12 as an electrode is supported by a pair of wells at one end of the bent bulbs 10a and 10f located on both sides of the arc tube on the non-communication tube side. The pair of wells is connected to a lamp-side wire led out of the bending bulb through a jumet wire sealed by a pinch seal or the like that does not use a mount at both ends of the bending bulb. Then, two pairs, that is, four lamp-side wires led out from the arc tube are electrically connected to the lighting device 30.

  An auxiliary amalgam 61 is provided at a desired end of the intermediate bending valve 10b to 10e and a well in the vicinity of the electrode. The auxiliary amalgam 61 provided in the intermediate bent valve is attached to the wells sealed by a pinch seal or the like, and is disposed at an intermediate position of the discharge path. The auxiliary amalgam is formed by plating approximately 3 mg of gold (Au) or silver (Ag) on a stainless steel substrate having a length of 2 mm, a width of 7 mm, and a thickness of 40 μm.

  The narrow tube 11 sealed to the intermediate bending valve 10c has a protruding length L1 from the end of the bending valve 10c of 15 to 50 mm so that the tip is located on the base 50 side in the cover body 20. In this embodiment, it protrudes without being bent by about 45 mm. The thin tube 11 protrudes to the inner space of the cover body 20 through a holder 23 and a insertion portion 31a of the circuit board 31, which will be described later. The size of the narrow tube insertion part 31a is formed such that the tip side portion of the thin tube 11 can be inserted. At this time, in order not to reduce the heat shielding effect of the substrate as much as possible, it is preferable to form the thin tube insertion portion 31a so that the distance between the thin tube insertion portion 31a and the thin tube 11 is 1 mm or less.

  The thin tube insertion portion 31a avoids a direction that, after assembly, falls down in a direction substantially perpendicular to a virtual plane including a pair of lead wires 33a that support the smooth electrolytic capacitor 32a mounted adjacent to the thin tube insertion portion 31a. It is arranged on the position, that is, the virtual plane area A. Further, the thin tube 11 is arranged so that the shape connecting the two smoothing electrolytic capacitors 32a and 32b and the central axis in the longitudinal direction of the thin tube 11 is substantially triangular. Note that the arrangement relationship between the smoothing electrolytic capacitor and the thin tube as shown in FIG. 7 may be used.

  The main amalgam 60 is based on an alloy composed of 50 to 65% by mass of bismuth (Bi) and 35 to 50% by mass of tin (Sn), and contains 12 to 25% by mass of mercury in the alloy. is there.

The lighting device 30 is configured to light with a lamp power of 7 to 15 W at a current density (current per cross-sectional area) in the arc tube 10 of 3 to 5 mA / mm ² .

  According to the light bulb-type fluorescent lamp of the present embodiment, the virtual shape connecting the two top electrolytic capacitors 32a, 32b and the central axis in the longitudinal direction of the thin tube 11 with the top as a top is substantially triangular, Since the thin tube 11 is arranged on a straight line in a region avoiding a direction substantially perpendicular to the virtual plane including the two lead wires 33a and 33a of the smoothing electrolytic capacitor 32a adjacent to the thin tube 11, the thin tube 11 and the smooth tube 11 are smoothed. Even if the electrolytic capacitor 32a comes into contact during assembly or transportation, the smooth electrolytic capacitor 32a can be prevented from being tilted while being easily deformed toward the thin tube 11, and the occurrence of breakage or cracking of the thin tube 11 can be suppressed.

  The bulb-type fluorescent lamp shown in FIG. 4 can be used for the lighting fixture illustrated in FIG. 8, for example.

  The lighting fixture 70 is a downlight embedded in a ceiling, and a light bulb-type fluorescent lamp is attached to a socket 71 attached to the fixture body.

  When the bulb-type fluorescent lamp specified as described above is used in a lighting device for a general lighting bulb, the light distribution of the bulb-type fluorescent lamp approximates the light distribution of the general lighting bulb, so that A sufficient amount of light is applied to the reflector near the disposed socket 71, and the device characteristics as the optical design of the reflector can be obtained. Moreover, even if it is a lighting fixture where the image of the internal light source is projected on a light diffusing cover such as a cloth like a light bulb stand, the light distribution of the light bulb shaped fluorescent lamp approximates the light distribution of a general lighting bulb, so there is no sense of incongruity Can be used.

1 is a partial cross-sectional view showing a light bulb shaped fluorescent lamp of an embodiment. The schematic diagram which shows the positional relationship of the electrolytic capacitor for smoothing in a cover body cylindrical part of FIG. 1, and a thin tube. The schematic diagram which shows another positional relationship of the electrolytic capacitor for smoothing in a cover body cylindrical part, and a thin tube. The partial cross section figure of the bulb-type fluorescent lamp in the 2nd Embodiment of this invention. Cross section of arc tube section. The schematic diagram which shows the positional relationship of the electrolytic capacitor for smoothing in a cover body cylindrical part of FIG. 4, and a thin tube. Schematic diagram showing another positional relationship between the electrolytic capacitor for smoothing and the narrow tube in the cylindrical part of the cover body 1 is a partial cross-sectional side view showing an embodiment of an embedded lighting fixture of the present invention.

Explanation of symbols

10 ... arc tube, 11 ... thin tube, 20 ... cover body, 30 ... lighting device,
32a, 32b ... smooth electrolytic capacitor, 33a, 33b ... lead wire, 40 ... globe,
50 ... base, 60 ... main amalgam

Claims (4)

An arc tube having a bent bulb;
A board is mounted with electrical components including a capacitor body and two or more relatively smooth electrolytic capacitors having a pair of lead wires provided on one end face of the body, and outputs high-frequency power to emit light A lighting device for lighting the tube;
A cylindrical part formed in a cylindrical shape on one end side is provided with a base, and a holding part for holding the arc tube is provided on the other end side, and at least two smoothing electrolytic capacitors among the electric parts are positioned in the cylindrical part. A cover body containing the lighting device while;
A tip portion communicating with the inside of the bent valve and extending from at least one end portion of the bent valve is located in the base-side cylindrical portion in the cover body, and the tip portion is at least one adjacently arranged. An arc tube protrusion disposed in the capacitor body region in the direction in which the pair of lead wires of the smoothing electrolytic capacitor are arranged;
A bulb-type fluorescent lamp characterized by comprising: An arc tube having a bent bulb;
A lighting device that mounts a plurality of electrical components including two or more relatively smooth electrolytic capacitors having a pair of lead wires on a substrate and outputs high-frequency power to light the arc tube;
A cylindrical portion formed in a cylindrical shape on one end side is provided with a base, and a holding portion for holding the arc tube is provided on the other end side, and at least two smoothing electrolytic capacitors among the electric parts are placed in the cylindrical portion. A cover body that houses the lighting device while being disposed on;
An arc tube protruding portion communicating with the inside of the bent bulb and extending from one end portion of the bent bulb, the tip portion of which is located in the cylindrical portion of the cover body together with the smoothing electrolytic capacitor;
The electric parts and the arc tube protrusions located in the cylindrical part of the cover body emit light at positions where each electric part avoids falling in a direction substantially perpendicular to a virtual plane including a pair of lead wires. A bulb-type fluorescent lamp characterized in that a tube protrusion is arranged. 3. The bulb-type fluorescent lamp according to claim 1, wherein all the lead wires for mounting the smoothing electrolytic capacitor and the arc tube protruding portions are arranged on the same straight line. A fluorescent lamp according to any one of claims 1 to 3;
An instrument body equipped with this fluorescent lamp;
An illumination device comprising:

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