JP2009135036A - Compact self-ballasted fluorescent lamp, and lighting fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact self-ballasted fluorescent lamp 11 capable of reducing that a lighting device 16 receives a thermal effect from an electrode 38 to generate heat most intensely when a light-emitting tube 14 is lighted while downsizing a cover. <P>SOLUTION: As for the light-emitting tube 14, three pieces of U-shaped tube bodies 31, 32, 33 are sequentially connected and aligned surrounding the center part of a bulb in a triangular, and the bent shape bulb 36 is formed. A pair of bulb end parts 31a, 33b positioned at both ends of the bulb 36 are arranged side by side and a pair of the electrodes 38 are sealed and mounted in the pair of the bulb end parts 31a, 33b. A substrate 51 of the lighting device 16 is longitudinally arranged along the direction of the center line of the base inside the cover including a base, and the cover is downsized. The substrate 51 is arranged in the vicinity of the tube body 32 most separated from the pair of the bulb end parts 31a, 33b positioned at both ends of the bulb of the light-emitting tube 14, and it is reduced that the lighting device 16 receives the thermal effect from the electrode 38 to generate heat most intensely when the light-emitting tube 14 is lighted on. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a bulb-type fluorescent lamp that can be used in place of a general lighting bulb, and a lighting fixture using the bulb-type fluorescent lamp.

  Conventionally, a bulb-type fluorescent lamp has an arc tube having a bent bulb in which a pair of electrodes are sealed at a pair of bulb ends arranged at one end in the height direction, and a base attached to one end. In addition, a cover that supports the bulb end side of the arc tube on the other end side, and a lighting device that is housed in the cover and lights the arc tube are provided (for example, see Patent Document 1).

In addition, there is a bulb-type fluorescent lamp in which the substrate of the lighting device housed in the cover is vertically arranged along the height direction, a part of this substrate is arranged inside the base, and the cover is miniaturized (for example, Patent Documents) 2).
Japanese Patent Laying-Open No. 2006-4728 (page 7-8, FIG. 1-2) JP 2007-48728 A (Page 6-9, FIG. 1-2)

  As described above, the cover of the lighting device to be housed in the cover can be vertically arranged, and a part of this substrate can be placed inside the base, so that the cover can be miniaturized. The heat generated by the arc tube tends to affect the lighting device.

  In other words, the arc tube at the time of lighting is the temperature of the pair of electrodes that generate the most heat, and the temperature rises. There is a problem that the lighting device substrate and circuit components mounted on the substrate are easily arranged, and the lighting device is easily affected by heat from the electrodes.

  The present invention has been made in view of such points, and a bulb-type fluorescent lamp capable of reducing the influence of the lighting device from the heat effect from the electrode that generates the most heat when the arc tube is turned on, while reducing the size of the cover, And it aims at providing the lighting fixture using this bulb-type fluorescent lamp.

  The bulb-type fluorescent lamp according to claim 1 has three U-shaped tubes each having a pair of bulb ends provided at one end in the height direction, which are sequentially connected, and these tubes are arranged around the central portion of the bulb. A valve formed in a bent shape in which a pair of valve end portions arranged in a triangular shape and positioned at both ends of the valve are arranged adjacent to each other, and a pair of electrodes sealed at the pair of valve end portions at both ends of the valve An arc tube; a cover with a base attached at one end and a bulb end side of the arc tube supported at the other end; and a vertically arranged inside the cover including the base along the center line of the base The inner side between the valve end of the tube that is parallel to the direction in which the pair of valve ends at both ends of the valve are aligned and is farthest from the pair of valve ends at both ends of the valve and the valve end adjacent to the valve end Insertion between Those that include a; is has a substrate is a lighting device for lighting a luminous tube.

  The arc tube is a bent arc tube in which three U-shaped tubes are juxtaposed to form one discharge path, and a pair of bulb ends at both ends of the bulb, which are both ends of the discharge path, are heightened. A pair of electrodes are sealed at one end of the pair of valves and at the ends of the pair of valves. The height direction is the direction in which the base, the cover, and the arc tube are arranged, and is the longitudinal direction of the bulb-type fluorescent lamp.

  A screw-in type referred to as an E-type is normally used as the base, but it is not limited to this as long as it can be attached to a socket to which a general lighting bulb is attached.

  The cover may be either for supporting the arc tube indirectly or directly. In the case of indirectly supporting the arc tube, it is preferable to use a holder to which the arc tube can be attached to the other end side of the cover.

  For example, the lighting device may be configured by an inverter circuit mainly composed of electronic components that turn on the arc tube by applying high-frequency power of 10 kHz or more to the arc tube. The portion of the substrate that is inserted into the bulb is positioned inside the bulb end.

  The bulb-type fluorescent lamp according to claim 2 is the bulb-type fluorescent lamp according to claim 1, wherein the arc tube has a pair of lead wires connected to electrodes from a pair of bulb ends at both ends of the bulb. Are pulled out in parallel with the direction in which the valve ends are arranged.

  A pair of lead wires drawn out from a pair of bulb ends at both ends of the bulb are connected by being wrapped around a wrapping pin protruding from the substrate or soldered to a land provided on the substrate.

  The light bulb shaped fluorescent lamp according to claim 3 is the light bulb shaped fluorescent lamp according to claim 1 or 2, wherein the lighting device has a positive temperature characteristic resistance element arranged in the base.

  The positive temperature characteristic resistance element is connected in parallel with the arc tube, makes the preheating of the electrode of the arc tube appropriate, and improves the blinking performance, and may be either a discrete component or a chip component. The positive temperature characteristic resistance element may be disposed in the vicinity of the switching element mounted on the substrate, and the switching element may be destroyed and circuit operation may be stopped when the heat generation is abnormal due to the malfunction of the positive temperature characteristic resistance element.

  The bulb-type fluorescent lamp according to claim 4 is the bulb-type fluorescent lamp according to any one of claims 1 to 3, wherein the lighting device has a negative temperature characteristic resistance element arranged in the vicinity of the bulb end. .

  The negative temperature characteristic resistance element is connected in parallel to each electrode of the arc tube to reduce power loss at the electrode, and may be either a discrete component or a chip component.

  The lighting fixture according to claim 5 comprises: a fixture main body; a socket attached to the fixture main body; and the light bulb shaped fluorescent lamp according to any one of claims 1 to 4 connected to the socket. is there.

  The instrument body is, for example, a downlight, but is not limited to this as long as the instrument body uses a general lighting bulb. As the socket, a screw-in type called E-type is usually used, but the socket is not limited to this as long as it is a socket to which a general lighting bulb is attached.

  According to the bulb-type fluorescent lamp of claim 1, the substrate of the lighting device is arranged vertically along the direction of the center line of the base inside the cover including the base, and a pair of bulb ends at both ends of the bulb are provided. Since it is inserted between the valve end of the pipe body that is parallel to the direction of the line and that is farthest from the pair of valve ends at both ends of the valve, and the valve end adjacent to this valve end, It is possible to reduce the influence of the lighting device from the heat generated by the electrode that generates the most heat when the arc tube is turned on, and the wiring between the pair of electrodes sealed at the pair of bulb ends at both ends of the bulb and the substrate Easy connection handling.

  According to the light bulb shaped fluorescent lamp of claim 2, in addition to the effect of the light bulb shaped fluorescent lamp of claim 1, a pair of lead wires connected to the electrodes from a pair of bulb end portions at both ends of the bulb of the arc tube. Is pulled out in parallel with the direction in which the pair of valve ends at both ends of the valve is aligned, the distance between each lead wire lead-out position from each valve end and the substrate becomes constant, and the lead wire is connected to the substrate. Easy handling.

  According to the light bulb shaped fluorescent lamp according to claim 3, in addition to the effect of the light bulb shaped fluorescent lamp according to claim 1 or 2, the positive temperature characteristic resistance element of the lighting device is arranged in the base. When abnormal heat is generated due to a failure of the resistance element, it is possible to reduce, for example, a resin component used for a cover or the like from being affected by heat.

  According to the bulb-type fluorescent lamp according to claim 4, in addition to the effect of the bulb-type fluorescent lamp according to any one of claims 1 to 3, the negative temperature characteristic resistance element of the lighting device is arranged in the vicinity of the bulb end. Therefore, even when the arc tube is exposed and the temperature in the cover where the lighting device is disposed does not become relatively high, the temperature of the negative temperature characteristic resistance element can be sufficiently increased to obtain a power saving effect.

  According to the lighting fixture of Claim 5, the lighting fixture which has an effect | action of the bulb-type fluorescent lamp of any one of Claim 1 thru | or 4 can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 to FIG. 5 show a first embodiment, FIG. 1 is a bottom view showing the positional relationship between a light emitting tube and a substrate of a bulb-type fluorescent lamp, and FIG. 2 is a direction parallel to the substrate surface of the bulb-type fluorescent lamp. 3 is a cross-sectional view seen from a direction perpendicular to the substrate surface of the light bulb-type fluorescent lamp, FIG. 4 is a circuit diagram of a lighting device for the light bulb-type fluorescent lamp, and FIG. 5 is a light bulb-type fluorescent lamp. It is sectional drawing of a lighting fixture.

  1 to 3, reference numeral 11 denotes a light bulb-type fluorescent lamp. The light bulb-type fluorescent lamp 11 includes a cover 13 having a base 12 at one end in the height direction, and an arc tube supported at the other end of the cover 13. 14, a holder 15 that supports one end of the arc tube 14 and is attached to the other end of the cover 13, and a base 12, the cover 13, and a lighting device 16 that is housed inside the holder 15. .

  The base 12 is, for example, an Edison type E26 type, and includes a cylindrical shell 21 having a thread and an eyelet 23 provided on the top of one end side of the shell 21 via an insulating portion 22. .

  Further, the cover 13 is formed of a heat-resistant synthetic resin such as polybutylene terephthalate (PBT), and a cylindrical base mounting portion 26 to which the shell 21 of the base 12 is attached is formed on one end side, and the other end side is formed. An expanded annular cover portion 27 is formed in. A substrate holding part 28 is formed in parallel to the center line of the cover 13 at a position offset to one side from the center line of the cover 13 inside the base attachment part 26.

  The arc tube 14 has three U-shaped tubes 31, 32, 33, and these tubes 31, 32, 33 are sequentially connected by a communication tube 34 to form one continuous discharge path 35. A formed bent valve 36 is formed. Each communication pipe 34 is formed by joining the openings formed by blowing and breaking the vicinity of the end portions where the pipe bodies 31, 32, 33 are connected to each other.

  The tubular bodies 31, 32, and 33 have a substantially cylindrical cross section made of glass, and are formed in a U shape having a top portion that is curved at an intermediate portion. That is, each of the tubular bodies 31, 32, and 33 has a bent portion that is curved and a pair of straight pipe portions that are parallel to each other and are connected to the bent portion, and ends of the pair of straight pipe portions that are one end side in the height direction. Valve end portions 31a, 31b, 32a, 32b, 33a, 33b are formed in the portion. The tubular bodies 31, 32, 33 are a pair of valve end portions 31a, 33b in which the tubular bodies 31, 32, 33 are arranged along the triangular side around the central portion of the valve and located at both ends of the valve. A pair of electrode side valve end portions 37 are arranged adjacent to each other, that is, a plurality of valve end portions 31a, 31b, 32a, 32b, 33a, 33b of these pipe bodies 31, 32, 33 are arranged around the central portion of the valve. A pair of electrode side valve end portions 37 which are a pair of valve end portions 31a and 33b located at both ends of the valve are arranged adjacent to each other. Accordingly, the pair of electrode side bulb end portions 37 are arranged side by side so as to be adjacent to each other at a position closer to one side than the bulb center portion.

  For example, a phosphor of a three-wavelength emission type is formed on the inner surface of the bulb 36, and the inside of the bulb 36 is an enclosed gas containing a rare gas such as argon (Ar), neon (Ne), or krypton (Kr), or mercury. Is enclosed.

  A pair of electrodes 38 are sealed by, for example, a flare stem, a stem seal, or a pinch seal at a pair of electrode side valve ends 37 positioned at both ends of the valve. Each electrode 38 has a filament coil, and this filament coil is supported by a pair of linear wells. Each well is connected to a pair of lead wires 39 that are led out from the electrode side bulb end 37 via a jumet wire sealed to the electrode side bulb end 37 and connected to the lighting device 16, for example. . Each pair of lead wires 39 connected to the pair of electrodes 38 is led out from the pair of electrode side valve end portions 37 in parallel with the direction in which the pair of electrode side valve end portions 37 are arranged.

  At least one of the pair of valve ends 31a, 31b, 32a, 32b, 33a, 33b of the tubular bodies 31, 32, 33 is sealed by, for example, a flare stem, a stem seal, or a pinch seal and is also called an exhaust pipe These thin tubes are provided in a projecting state. Each of these capillaries is sequentially sealed by fusing in the manufacturing process of the arc tube 14, and the inside of the bulb 36 is exhausted through an unsealed part of each capillaries, and the sealed gas is sealed and replaced. After that, sealing is performed by fusing an unsealed part of each of the thin tubes.

  One of the narrow tubes 40a and 32b of the central tube 32 is formed long so that the tip extends to the inside of the base 12 and is parallel to the straight tube portion of the valve 36. It is a long tube formed in a straight line, and a main amalgam 41 as an amalgam is sealed at the tip of the long tube. The main amalgam 41 is an alloy composed of bismuth, tin and mercury, is formed in a substantially spherical shape, and has an action of controlling the mercury vapor pressure in the arc tube 14 within an appropriate range. In addition, as the main amalgam 41, what was formed with the alloy which combined indium, lead, etc. other than bismuth and tin may be used. Further, an auxiliary amalgam having a mercury adsorption / release action may be attached to the other of the wells of the electrode 38 and the narrow tube of the valve end 32b of the central tube 32.

  The holder 15 is formed of, for example, a heat-resistant synthetic resin such as polybutylene terephthalate (PBT), and has a disk-shaped holder portion 44 and a cylindrical shape that protrudes from the peripheral portion of the holder portion 44 to one end side. The cover part 45 is provided.

  The holder portion 44 has a plurality of insertion holes 46 into which the bulb end portions 31a, 31b, 32a, 32b, 33a, 33b of the tube bodies 31, 32, 33 of the arc tube 14 are inserted. It is formed side by side around. With the valve end portions 31a, 31b, 32a, 32b, 33a, 33b being inserted into the respective insertion holes 46 of the holder portion 44, an adhesive 47 such as silicone resin or epoxy resin is injected from the inside of the holder 15. Thus, the valve 36 is bonded and fixed to the holder 15.

  The cover portion 45 is fitted to the other end side of the cover portion 27 of the cover 13 at one end side to form a part of the appearance together with the cover 13, and the cover portion 45 is fitted to the cover portion 25 of the cover 13 at one end side thereof. A locking portion 48 for locking is formed.

  The lighting device 18 includes a substrate 51 on which a plurality of electronic components 53 constituting the lighting circuit 52 are mounted. The substrate 51 has a narrower width on the base 12 side than the cover 13 side, and is formed in a width dimension that allows the base 12 side to be inserted into the inner side of the base 12 and has a longer height dimension than the width dimension. It is formed in a substantially rectangular shape.

  The substrate 51 is vertically engaged along the direction of the center line of the cover 13 (that is, the center line of the bulb-shaped fluorescent lamp 11) by inserting and engaging the side edges of the substrate 51 with the pair of substrate holding portions 28 of the cover 13. It is arranged at a position offset with respect to the center line of the cover 13. That is, in a state where the base 12, the cover 13 and the holder 15 are combined, the substrate 51 is disposed vertically along the direction of the center line of the base 12 with respect to the inside of the base 12, and at both ends of the valve. A pair of valve end portions 31a and 33b, which are arranged at positions closer to the other side than the valve center portion away from the pair of electrode side valve end portions 37, and the center farthest from the pair of electrode side valve end portions 37 The tube body 32 is disposed at an offset position in the vicinity of the valve ends 32a and 32b.

  The substrate 51 is disposed in parallel with the direction in which the pair of electrode side valve ends 37 which are the pair of valve ends 31a and 33b at both ends of the valve are arranged. Further, both sides of the substrate 51 are connected to the valve ends 32a and 32b of the central tube 32 farthest from the pair of electrode side valve ends 37 which are the pair of valve ends 31a and 33b at both ends of the valve, and the valve ends. The pipe bodies 31 and 33 adjacent to 32a and 32b are inserted and arranged between the valve ends 32b and 33a. Further, a wrapping pin 54 as a pair of connecting portions for connecting and connecting a pair of lead wires 39 of each electrode 38 of the arc tube 14 is projected from the other end side of the substrate 51 on the arc tube 14 side. Yes.

  The position in the height direction of the substrate 51 is positioned and held by the connection between the lead wire 39 of the arc tube 14 and the wrapping pin 54 or by the pinching between the base 12 and the holder 15.

  In addition, electronic components 53 are mounted on both surfaces of the substrate 51. On the surface of the substrate 51 on the side where the distance from the base 12 is wide, the transformer CT, capacitor C1, electrolytic capacitor C2, etc. of the electronic components 53 are large. Type electronic component 53 is mounted, and on the surface of substrate 51 on the side where the distance from base 12 is narrow, field effect transistors Q1 and Q2 having a low height of electronic component 53, chip type capacitors and rectifiers are used. A surface mounting type electronic component 53 such as an element is mounted. As the field effect transistors Q1 and Q2, a MOS type N-channel field effect transistor Q1 and a MOS type P channel field effect transistor Q2 are used as one package component.

  Further, a narrow tube 40 enclosing the main amalgam 41 is disposed between the surface side of the substrate 51 where the distance from the base 12 is narrow.

  Further, inside the cover 13, a heat blocking member 57 that thermally blocks the base 12 side and the arc tube 14 side is disposed. For example, a silicone resin or an epoxy resin is used for the heat blocking member 57 and is injected so as to fill at least an opening between the inner peripheral surface of the cover 13 and the substrate 51 and the electronic component 53. Note that the heat shield between the base 12 side and the arc tube 14 side may mean that the opening between the vertically arranged substrate 51 and the inside of the cover 13 may be sealed without any gap, or there may be a gap if the heat can be blocked. May be. Further, the heat shielding member 57 may be provided up to the inside of the base 12 or the inside of the holder 15, and if it is provided to the inside of the base 12, the cover 13 and the base 12 are bonded and fixed. The strength of is improved. Further, if the inner side of the holder 15 is provided, the strength of the cover 13 and the holder 15 is improved for the same reason.

  Further, inside the base 12, a heat conductive member 58 that thermally connects the tip of the thin tube 40 enclosing the main amalgam 41 disposed in the base 12 and the base 12 is disposed. Some of the electronic components 53 such as the electrolytic capacitor C2, which is a heat generating component, may be further thermally connected to the heat conductive member 58. For example, silicone resin or epoxy resin is used for the heat conductive member 58. For example, before the base 12 is combined, the heat conductive member 58 is thermally conductive to the tip of the thin tube 40 accommodated in the base 12, the substrate 51, the electronic component 53, and the like. Each component can be connected by the heat conductive member 58 by injecting the conductive member 58 or combining the base 12 into which the heat conductive member 58 is injected. The heat conductive member 58 may fill the entire inside of the base 12, that is, may be in contact with the heat blocking member 57.

  FIG. 4 shows a circuit diagram of the lighting device 16. A capacitor C1 constituting a filter is connected to the commercial AC power source e via a fuse F1, and an input terminal of a full-wave rectifier 71 is connected to the capacitor C1 via an inductor L1 constituting the filter. Further, a smoothing electrolytic capacitor C2 is connected to the output terminal of the full-wave rectifier 71 to constitute an input power supply circuit E. The smoothing electrolytic capacitor C2 of the input power supply circuit E has an AC power supply that generates a high frequency. The inverter main circuit 73 of the half bridge type inverter circuit 72 is connected.

  This inverter main circuit 73 is parallel to the smoothing electrolytic capacitor C2, and is a field effect transistor Q1 as a MOS-type N-channel transistor that is complementary to each other as a switching element, and a MOS-type P-channel transistor. Field effect transistors Q2 are connected in series. The sources of the N-channel field effect transistor Q1 and the P-channel field effect transistor Q2 are connected to each other.

  A series circuit of a primary winding L2 of a transformer CT constituting a ballast choke as a resonant inductor, a DC cut capacitor C3, and a resonant capacitor C4 is connected between the drain and source of the field effect transistor Q2, and this resonant capacitor C4 Are connected to one ends of filament coils FLa and FLb at both ends of the arc tube 14, and between the other end of one electrode filament coil FLa and the other end of the other electrode filament coil FLb, contributes to resonance together with a resonance capacitor C4. A starting capacitor C5 is connected. An emitter is applied to the electrode filament coils FLa and FLb. In addition, a positive temperature characteristic resistive element (Positive Temperature Coefficient) PTC1 is connected in parallel to the resonant capacitor C4.

  A starting resistor R1 constituting the starting circuit 75 is connected between the smoothing electrolytic capacitor C2, the gate of the field effect transistor Q1 and the gate of the field effect transistor Q2, and the gates of these field effect transistors Q1. And a series circuit of a capacitor C6 and a capacitor C7 is connected between the gate of the field effect transistor Q2 and the source of the field effect transistor Q1 and the field effect transistor Q2, and the capacitor C6 and the gate control circuit 76 as a gate control means A series circuit of a Zener diode ZD1 and a Zener diode ZD2 for gate protection of the field effect transistor Q1 and the field effect transistor Q2 is connected in parallel to the series circuit of the capacitor C7. The primary winding L2 of the transformer CT is provided with a secondary winding L3 that is magnetically coupled. The secondary winding L3 has an inductor L4 having one end connected to the connection point of the capacitors C6 and C7. Is connected to the connection point between the other end of the capacitor and the discharging resistor R2. The capacitor C6 also constitutes a trigger element of the start circuit 75, and the discharge resistor R2 of the start circuit 75 is connected in parallel to the series circuit of the capacitor C6 and the inductor L4.

  In addition, a parallel circuit of the resistor R3 of the starting circuit 75 and the capacitor C8 for improving switching is connected between the drain and source of the field effect transistor Q2.

  Negative temperature coefficient resistors NTC1 and NTC2 are connected between one end and the other end of each of the filament coils FLa and FLb of the arc tube 14.

  The operation of the lighting device 16 will be described.

  First, when the power is turned on, the voltage of the commercial AC power source e is full-wave rectified by the full-wave rectifier 71 and smoothed by the smoothing electrolytic capacitor C2.

  A voltage is applied to the gate of the N-channel field effect transistor Q1 via the resistor R1, and the field effect transistor Q1 is turned on. When the field effect transistor Q1 is turned on, a voltage is applied to the closed circuit of the primary winding L2, transformer C3, resonant capacitor C4, and capacitor C5 of the transformer CT, and the primary winding L2, transformer C3, resonant capacitor C4, and capacitor C5 of the transformer CT Resonates. At this time, the impedance component of the positive temperature characteristic resistance element PTC1 is also included as part of the resonance synthesis component. In addition, a voltage corresponding to the resonance waveform of the inductance component of the primary winding L2 of the transformer CT is induced in the secondary winding L3 of the transformer CT, and the LC series circuit of the capacitor C7 and the inductor L4 of the gate control circuit 76 is inherently resonant. Thus, a voltage is generated to turn on the field effect transistor Q1 and turn off the field effect transistor Q2 at a substantially constant frequency.

  Next, when the resonance voltage of the primary winding L2, transformer C3, resonant capacitor C4, and capacitor C5 of the transformer CT is inverted, a voltage opposite to the previous voltage is generated in the secondary winding L3, and the gate control circuit 76 generates a field effect transistor Q1. Is turned off, and a voltage for turning on the field effect transistor Q2 is generated. Further, when the resonant voltage of the primary winding L2, transformer C3, resonant capacitor C4, and capacitor C5 of the transformer CT is inverted, the field effect transistor Q1 is turned on and the field effect transistor Q2 is turned off. Thereafter, similarly, the field effect transistor Q1 and the field effect transistor Q2 are alternately turned on and off, a resonance voltage is generated, and a resonance current flows.

  In a state where this resonance current has flowed out, the positive temperature characteristic resistance element PTC1 has a low temperature and therefore has a resistance value as low as, for example, about 3 kΩ to 5 kΩ, and a large current flows through the positive temperature characteristic resistance element PTC1. At this time, the resonance voltage generated between both ends of the resonance capacitor C4 becomes low.

  When current flows through the positive temperature characteristic resistance element PTC1, Joule heat is generated, and when the resistance value of the positive temperature characteristic resistance element PTC1 increases and the current flowing through the positive temperature characteristic resistance element PTC1 decreases, the resonance composite component changes. Therefore, the resonance operation changes so that the current flowing through the resonance capacitor C4 increases, and the soft start operation is performed so that the resonance voltage gradually increases.

  A part of the resonance current also flows through the capacitor C5, which is a part of the resonance capacitor C4, via the filament coils FLa and FLb of the arc tube 14, so that the filament coils FLa and FLb are sufficient until the resonance voltage rises. Directly preheated over time. In addition, by providing the resonance capacitor C5 separately from the resonance capacitor C4, the capacity for resonance is divided, and the capacity of the capacitor C5 is reduced during preheating of the filament coils FLa and FLb and lighting of the arc tube 14. The current that flows can be set to an appropriate value, the filament coils FLa and FLb can be preheated efficiently, and the current that flows to the capacitor C5 can be reduced after the arc tube 14 is turned on, preventing a decrease in efficiency after lighting. it can.

  Furthermore, the resistance value of the positive temperature characteristic resistance element PTC1 increases and the resonance current increases due to the change of the resonance component, and the primary winding L2 of the transformer CT constituting the ballast choke is saturated, and the voltage required for starting the lamp is reached. When the voltage rises, the arc tube 14 starts discharging, starts and lights up.

  After the arc tube 14 is turned on, the resistance value of the positive temperature characteristic resistance element PTC1 is about several tens of kΩ, and the equivalent resistance value of the arc tube 14 is sufficiently smaller than the resistance value of the positive temperature characteristic resistance element PTC1, so that the resonance voltage decreases. Thus, the arc tube 14 is kept on. In addition, by connecting the positive temperature characteristic resistance element PTC1 in parallel to the resonant capacitor C4 instead of the capacitor C5, the current flowing through the filament coils FLa and FLb can be reduced, thereby reducing power loss accordingly. it can.

  Thus, since the preheating of the filament coils FLa and FLb of the arc tube 14 can be made appropriate by changing the resistance value of the positive temperature characteristic resistance element PTC1, it is possible to prevent the emitter from scattering (sputtering) undesirably. The number of flashing lifetimes of the arc tube 14 can be improved.

  In addition, when the temperature of the negative temperature characteristic resistance elements NTC1 and NTC2 before the arc tube 14 is started is low, the resistance values of the negative temperature characteristic resistance elements NTC1 and NTC2 are high. Flows through the filament coils FLa and FLb and preheats the filament coils FLa and FLb appropriately. Furthermore, as the resonance current increases, the negative temperature characteristic resistance elements NTC1 and NTC2 generate heat due to Joule heat due to a part of the resonance current that has also flowed in the negative temperature characteristic resistance elements NTC1 and NTC2, and further, from the arc tube 14 The temperature rises under the influence of heat, and the resistance value of the negative temperature characteristic resistance elements NTC1, NTC2 decreases. As a result, the current flowing in the filament coils FLa and FLb gradually flows in the negative temperature characteristic resistance elements NTC1 and NTC2.

  Furthermore, when the temperature of the negative temperature characteristic resistance elements NTC1 and NTC2 rises after the arc tube 14 is turned on and the resistance value decreases as much as possible, most of the resonance current flows to the negative temperature characteristic resistance elements NTC1 and NTC2, and the filament coil Since it hardly flows to FLa and FLb, the power loss due to the filament coils FLa and FLb can be reduced as much as possible.

  Further, as shown in FIG. 5, for example, a lighting fixture 81 which is a downlight has a fixture main body 82, and a socket 83 and a reflector 84 are attached in the fixture main body 82. 11 is installed.

  In the bulb-type fluorescent lamp 11, the substrate 51 formed in a width dimension that can be inserted into the inside of the base 12 is arranged vertically along the direction of the center line of the base 12, so that the substrate 51 and the electronic component The cover 13 can be downsized by arranging 53 inside the base 12.

  Further, the substrate 51 is disposed at a position closer to the other side than the central portion of the valve that is separated from the pair of electrode side valve ends 37 that are the pair of valve ends 31a and 33b at both ends of the valve, Since it is disposed at an offset position in the vicinity of the valve ends 32a and 32b of the central tube 32 farthest from the valve end 37, the pair of electrode side valve ends 37 and the substrate 51 can be moved away from each other. . Therefore, it is possible to reduce the lighting device 16 from being affected by heat from the electrode 38 that generates the most heat when the arc tube 14 is lit while reducing the size of the cover 13.

  Further, the substrate 51 is arranged in parallel to the direction in which the pair of electrode side valve ends 37, which are the pair of valve ends 31a and 33b at both ends of the valve, and is connected to the pair of electrodes 38. Since the wire 39 is drawn from the pair of electrode side valve ends 37 in parallel with the direction in which the pair of electrode side valve ends 37 are arranged, the lead wires 39 are drawn from the pair of electrode side valve ends 37. The distance relationship between the position and the substrate 51 becomes constant, and the handling of connecting the lead wires 39 around the wrapping pins 54 of the substrate 51 can be facilitated.

  Further, both sides of the substrate 51 are connected to the valve ends 32a and 32b of the central tube 32 farthest from the pair of electrode side valve ends 37 and the valves of the tubes 31 and 33 adjacent to the valve ends 32a and 32b. Since the light emitting tube 14 and the substrate 51 are overlapped in the height direction by being inserted between the ends 32b and 33a, the cover 13 can be miniaturized in the height direction.

  Next, FIG. 6 shows a second embodiment, and FIG. 6 is a cross-sectional view of a part of the bulb-type fluorescent lamp.

  The positive temperature characteristic resistance element PTC1 is disposed in the base 12. The positive temperature characteristic resistance element PTC1 is a discrete component, and a lead wire is wound around the wrapping pin 54 and arranged on the side where the distance from the base 12 of the substrate 51 is narrow via the lead wire.

  Thereby, it is possible to reduce the influence of heat on the cover 13 which is a resin component during abnormal heat generation due to a failure of the positive temperature characteristic resistance element PTC1, and to prevent the cover 13 from melting.

  Further, the positive temperature characteristic resistance element PTC1 may be disposed close to the field effect transistors Q1 and Q2, so that when the abnormal temperature is generated due to the malfunction of the positive temperature characteristic resistance element PTC1, the field effect transistor is caused by the heat. Q1 and Q2 can be destroyed and circuit operation can be stopped.

  The positive temperature characteristic resistance element PTC1 may be surface-mounted on the substrate 51 using a chip component.

  Next, FIG. 7 shows a third embodiment, and FIG. 7 is a partial cross-sectional view of a bulb-type fluorescent lamp.

  Negative temperature characteristic resistance elements NTC1 and NTC2 are arranged in the vicinity of the bulb end 32b of the arc tube 14. The negative temperature characteristic resistance elements NTC1 and NTC2 are chip parts and are surface-mounted on the substrate 51.

  Thus, even when the arc tube 14 is exposed and the temperature in the cover 13 where the lighting device 16 is disposed does not become relatively high, the temperature of the negative temperature characteristic resistance elements NTC1 and NTC2 is generated by the heat generated when the arc tube 14 is turned on. Can be sufficiently increased, and a power saving effect can be obtained.

  Next, FIG. 8 shows a fourth embodiment, and FIG. 8 is a sectional view of a bulb-type fluorescent lamp.

  The arc tube 14 also emits light from the end face sides of the bulb end portions 31a, 31b, 32a, 32b, 33a, 33b.

  For example, as shown in FIG. 2, when all the bulb end portions 31a, 31b, 32a, 32b, 33a, 33b of the arc tube 14 are inserted into the respective insertion holes 46 of the holder 15 and face the cover 13 The light emitted from the end faces of the bulb end portions 31a, 31b, 32a, 32b, 33a, and 33b is irradiated inside the cover 13 and is not extracted to the outside, and light loss occurs.

  Therefore, as shown in FIG. 8, the holder 15 corresponds to the bulb end portions 31a, 33b from which the lead wire 39 of the arc tube 14 is drawn out, the bulb end portion 32a, etc. from which the narrow tube 40 is projected. Although the insertion hole 46 is provided at a position, the insertion hole 46 is not provided at a position corresponding to the other valve end portions 31b, 32b, and 33a, and the holder portion 44 is closed. Thereby, the light emitted from the end faces of the bulb end portions 31b, 32b, 33a is reflected by the holder 15 and can be extracted to the outside, so that the light extraction efficiency can be improved.

  Next, FIG. 9 shows a fifth embodiment, and FIG. 9 is a cross-sectional view of a bulb-type fluorescent lamp.

  In FIG. 8, in the fourth embodiment, a protrusion 44 a that fits between the insides of the valve end portions 31 a, 31 b, 32 a, 32 b, 33 a, and 33 b is further projected at the center of the outer surface of the holder portion 44 of the holder 15. Set up. Thereby, the attachment area of the holder 15 and valve | bulb edge part 31a, 31b, 32a, 32b, 33a, 33b can be increased, and attachment strength can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1, showing a first embodiment of the present invention, is a bottom view showing a positional relationship between an arc tube and a substrate of a bulb-type fluorescent lamp. It is sectional drawing seen from the direction parallel to the board | substrate surface of a bulb-type fluorescent lamp same as the above. It is sectional drawing seen from the direction perpendicular | vertical to the board | substrate surface of a bulb-type fluorescent lamp same as the above. It is a circuit diagram of the lighting device of the same bulb-type fluorescent lamp. It is sectional drawing of the lighting fixture using a bulb-type fluorescent lamp same as the above. It is sectional drawing of a part of bulb-type fluorescent lamp which shows 2nd Embodiment. It is sectional drawing of a part of bulb-type fluorescent lamp which shows 3rd Embodiment. It is sectional drawing of the lightbulb-type fluorescent lamp which shows 4th Embodiment. It is sectional drawing of the bulb-type fluorescent lamp which shows 5th Embodiment.

Explanation of symbols

11 Bulb-type fluorescent lamp
12 base
13 Cover
14 arc tube
16 Lighting device
31, 32, 33 tube
31a, 31b, 32a, 32b, 33a, 33b Valve end
36 Valve
38 electrodes
39 Lead wire
51 PCB
81 Lighting equipment
82 Instrument body
83 socket
NTC1, NTC2 Negative temperature characteristic resistance element
PTC1 Positive temperature characteristic resistance element

Claims (5)

Three U-shaped tubes having a pair of valve ends provided at one end in the height direction are sequentially connected, and these tubes are arranged in a triangular shape around the center of the valve and positioned at both ends of the valve. A bulb formed in a bent shape in which a pair of bulb ends are arranged adjacent to each other, and an arc tube having a pair of electrodes sealed at a pair of bulb ends at both ends of the bulb;
A cover having a base attached to one end and a bulb end side of the arc tube supported on the other end;
Inside the cover including the base, it is arranged vertically along the direction of the center line of the base, and is parallel to the direction in which the pair of valve ends at both ends of the valve are aligned and farthest from the pair of valve ends at both ends of the valve A lighting device having a substrate inserted between the bulb end of the tubular body and the bulb end adjacent to the bulb end and lighting the arc tube;
A bulb-type fluorescent lamp characterized by comprising: The arc tube is characterized in that a pair of lead wires connected to the electrodes are drawn out from a pair of bulb ends at both ends of the bulb in parallel with a direction in which the pair of bulb ends at both ends of the bulb are arranged. The described bulb-type fluorescent lamp. The bulb-type fluorescent lamp according to claim 1 or 2, wherein the lighting device has a positive temperature characteristic resistance element disposed in the base. The light-emitting fluorescent lamp according to any one of claims 1 to 3, wherein the lighting device includes a negative temperature characteristic resistance element disposed in the vicinity of the bulb end. An instrument body;
A socket attached to the instrument body;
A bulb-type fluorescent lamp according to any one of claims 1 to 4 connected to a socket;
The lighting fixture characterized by comprising.

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