JP2007042294A - Compact self-baallasted fluorescent lamp and illumination device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve efficiency of light flux emitted from a light emitting tube by preventing the light flux from being blocked by a cover by using a T-shaped globe, and to reduce adverse effect of a heat generated by the light emitting tube on a lighting device. <P>SOLUTION: The fluorescent lamp is composed of a light emitting tube 14 in which a bulb of tube diameter of 3-8 mm is bent and which has maximum diameter of 30 mm; a lighting device 17 lighting the light emitting tube 14; a globe 16 with maximum diameter of 50 mm, enveloping the light emitting tube, having an opening with a diameter of 20 to 35 mm at one end, of which the part between the opening and an apex part at the other side is formed into nearly cylinder shape; and a cover 13 housing the lighting device 17, having a metal fitting arranged at one end thereof, having an externally exposed part of which the length against the length of the lamp excluding the metal fitting is 0 to 25%, communicating with the opening of the globe at the other side. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a bulb-type fluorescent lamp and a lighting device having a globe covering an arc tube.

As a conventional light bulb-type fluorescent lamp, as shown in Patent Document 1, a lamp having a normal light bulb-type globe that covers an arc tube formed by joining a plurality of glass bulbs bent in a U shape is known. ing.
Japanese Patent Laid-Open No. 2000-21351 (FIGS. 1, 18, etc.)

  In the above conventional lamp, a cover is provided for the purpose of housing the lighting device. As an example of the cover outer diameter, the cover has an outer diameter of about 80% of the maximum outer diameter of the globe, and the outer diameter is about 1.7 to 1.8 times the outer diameter of the base. The cover has. For this reason, the above-mentioned cover portion occupies a large proportion of the entire lamp, and the luminous flux emitted from the arc tube is blocked by the cover, and in particular, the light output to the base side cannot be obtained, resulting in poor efficiency. Met.

  Also, since the maximum outer diameter of the cover is large, heat radiated from the arc tube in the globe is easily transferred by convection, conduction, etc. through the large diameter portion of the cover, and heat is applied to the lighting device housed in the cover. Adversely affected. In particular, when a T-shaped glove in the JIS standard is adopted, this problem may become prominent if the glove is downsized.

  The problem to be solved by the invention is that the luminous flux emitted from the arc tube is blocked by the cover and the efficiency is low, and the heat generated by the arc tube is stored in the cover via the large diameter portion of the cover. It is a point which gives a thermal bad influence to a lighting device. In the present invention, in order to solve this, even when a T-shaped glove in the JIS standard is adopted, the efficiency is improved by reducing the rate at which the luminous flux emitted from the arc tube is blocked by the cover, It is another object of the present invention to provide a bulb-type fluorescent lamp in which adverse effects on the lighting device caused by heat generated by the arc tube are reduced, and an illumination device using the bulb-type fluorescent lamp.

The bulb-type fluorescent lamp according to the present invention is formed by bending a bulb having a tube diameter of 3 to 8 mm, a luminous tube having a maximum diameter of 30 mm, a lighting device for lighting the luminous tube, and a diameter of 20 to 35 mm. A glove having an opening on one end, a portion between the opening and the top on the other end being formed in a substantially cylindrical shape and having a maximum outer diameter of 50 mm containing the arc tube; And a cover that has an external exposure length of 0 to 25% with respect to the lamp length excluding the base and communicates with the opening of the glove on the other end side.
A state in which the external exposure length is 0% with respect to the lamp length excluding the base means a state in which the cover is almost contained in the globe and the entire cover cannot be seen from the outside. A preferable range of the external exposure length is 5 to 15%.

The bulb-type fluorescent lamp according to the present invention is formed by bending a bulb having a tube diameter of 3 to 8 mm, and has a maximum diameter of 30 mm; a lighting device for lighting the arc tube; and an opening on one end side A globe between the opening and the top of the other end is formed in a substantially cylindrical shape, and includes a globe having a maximum outer diameter of 50 mm containing the arc tube; a lighting device is housed, and a base is attached to one end, Cover whose outer diameter is 0.6 to 1.0 times the maximum outer diameter of the globe, 1.1 to 1.5 times the outer diameter of the base, and the other end is attached to the opening of the glove And characterized by comprising: and.
The cover is attached to the opening of the globe, and the diameter of the opening of the globe is not more than the maximum diameter of the cover.

  The bulb-type fluorescent lamp according to the present invention is characterized in that the maximum outer diameter of the globe is formed to be 1.0 to 1.6 times the outer diameter of the base.

  The lighting device according to the present invention comprises: a lighting fixture body; a socket attached to the lighting fixture body; and the bulb-type fluorescent lamp according to any one of claims 1 to 3 attached to the socket. It is characterized by that.

  In the present invention, the outer diameter of the opening in the glove is 20 to 35 mm, the maximum outer diameter of the glove is 50 mm, and the opening of the glove and the cover are configured to communicate with each other. The diameter is narrowed in the vicinity of the opening, and heat generated by the arc tube does not easily flow from the vicinity of the opening to the lighting device side, thereby reducing the thermal influence on the lighting device. In addition, since the cover has a length of 0 to 25% with respect to the lamp length excluding the base, the range in which the light emitted from the arc tube is blocked by the cover is reduced, and efficient illumination is achieved. Is possible.

  In the present invention, the maximum outer diameter of the cover is 0.6 to 1.0 times the maximum outer diameter of the globe, and is 1.1 to 1.5 times the outer diameter of the base. Therefore, the cover portion can be reduced in size, and the thermal influence on the lighting device is reduced.

  Furthermore, in the present invention, since the maximum outer diameter of the glove is formed to be 1.0 to 1.6 times the outer diameter of the base, the outer diameter is held down until reaching the glove from the base. It is possible to arrange the lamp in a narrow space, and the range of application is widened.

  The present invention achieves the object of reducing the diameter in the vicinity of the opening of the globe to reduce the thermal influence on the lighting device, and in the cover, the length relative to the lamp length excluding the base is compared with the conventional one. It is configured to be short, so that the light emitted from the arc tube is not easily blocked by the cover, and the object of enabling efficient illumination is achieved.

  Embodiments of a light bulb shaped fluorescent lamp and a lighting device according to the present invention will be described below with reference to the accompanying drawings. In each figure, the same components are denoted by the same reference numerals, and redundant description is omitted. 1 and 2 are cross-sectional views of a bulb-type fluorescent lamp according to an embodiment. In FIG. 1, a cross section is obtained so that one U-shaped glass bulb is a vertical cross section, and in FIG. The cross section is obtained so that the U-shaped glass bulb of the book has a vertical cross section at the top of the U-shape. 3 shows a cross-sectional view seen from the holder side with the cover and the globe removed, and FIG. 4 shows a perspective view of the holder. FIG. 5 shows an inner perspective view of the holder combined with the arc tube.

  The bulb-type fluorescent lamp 11 in FIG. 1 and FIG. 2 is drawn such that a base 12 is located on the lower side of the figure, and a cover 13 is provided at the upper end of the base 12. A globe 16 is provided on the large-diameter opening side of the cover 13, and the globe 16 includes an arc tube 14 supported by a holder 15. A lighting device 17 for lighting the arc tube 14 is housed and provided inside the base 12 and the cover 13.

  The globe 16 has an opening on one end side, the top on the other end side is a substantially hemispherical portion, and the portion from the opening to the hemispherical portion is formed in a substantially straight cylindrical shape.

  As the base 12, Edison type E26 or the like can be used, or E17 can be used. The base 12 is provided with a cylindrical shell 21 having a screw thread and an eyelet 23 surrounded by an insulating portion 22 on one end side of the shell 21. A cover 13 is placed on the other end of the shell 21 and fixed by caulking or an adhesive.

  The cover 13 is made of a heat resistant synthetic resin such as polybutylene terephthalate (PBT). A cylindrical base mounting portion 26 to which the shell 21 of the base 12 is attached is formed on one end side of the cover 13, and an annular cover that is tapered toward the opening side on the other end side. A portion 27 is formed. Furthermore, a holder attachment portion 28 for attaching the holder 15 is formed inside the cover 13.

  The arc tube 14 is configured such that three U-shaped bulbs 31 to 33 are formed in a U-shape by bending the bulb. These U-shaped bulbs 31 to 33 are sequentially connected by a communication pipe 34 and have one continuous discharge path 35. Each communication pipe 34 is configured by heating and melting and blowing off the wall portion of the pipe connected in the valves 31 to 33, and connecting the openings generated thereby.

  The valves 31 to 33 are made of glass with a tube diameter of 3 to 8 mm, and the cross section thereof is substantially cylindrical. The valves 31 to 33 each have a bent portion that is curved in a U shape and a pair of straight pipe portions that are continuous with the bent portion and are parallel to each other. The height of the valve 32 bent in a U-shape located in the center is configured to be higher than the height of the valves 31 and 33 on both sides thereof. Furthermore, in the valves 31 to 33, the side surfaces that appear to be U-shaped are arranged so as to be adjacent to each other in parallel.

  For example, a three-wavelength phosphor is formed on the inner surface of the arc tube 14, and a rare gas such as argon (Ar) or krypton (Kr), or a gas containing mercury is contained in the arc tube 14. It is enclosed.

  The arc tube 14 has a discharge path 35 to which a bulb 31, a bulb 32, and a bulb 33 are connected. A pair of electrodes 36 is sealed by a stem seal or a pinch seal at one end of each of the bulb 31 and the bulb 33 located at both ends of the discharge path 35. Each electrode 36 has a filament coil, and this filament coil is supported by a pair of linear wells. Each well is, for example, a pair of wires 37 (which are led out from one end of both bulbs 31 and 33 to the outside and connected to the lighting device 17 via a jumet wire sealed at one end of the bulbs 31 and 33 on both sides. 5).

  Cylindrical narrow tubes 38 called exhaust pipes, which are sealed by stem seals or pinch seals, project from one end of the valves 31 and 33 where the electrodes are sealed and both ends of the central valve 32. The valves are in communication. The above-mentioned narrow tube 38 is sealed by fusing in the manufacturing process of the arc tube 14, the inside of the arc tube 14 is exhausted through an unsealed part of each narrow tube 38, and the sealed gas is sent to replace the tube. Then, sealing is performed by fusing an unsealed part of each capillary tube 38.

  Of the narrow tubes 38 at both ends of the valve 32 positioned at the center, one narrow tube 38 is formed long so that the tip portion extends to the inside of the base 12 and is parallel to the straight tube portion of the valve 32. It is formed in a straight line, and a main amalgam 39 as an amalgam is enclosed at the tip thereof when sealed. The main amalgam 39 is an alloy composed of bismuth, tin and mercury, and 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 39, what was formed with the alloy which combined indium, lead, etc. other than bismuth and tin can also be used. In addition, auxiliary amalgam having mercury adsorption / release action is attached and sealed in the electrode wells of the bulbs 31 and 33. Further, an auxiliary amalgam similar to the auxiliary amalgam provided in the valves 31 and 33 is attached and enclosed at the other end of the valve 32 located at the center.

  In the arc tube 14, the pair of electrode side end portions 40 in which the pair of electrodes in the bulbs 31 to 33 are sealed are located on one end side in the height direction. The bulb outer diameter of the bulbs 31 to 33 is set to 3 to 8 mm in consideration of an increase in lamp voltage, and the maximum diameter b1 is 15 to 30 mm (preferably in the arc tube 14 which is a set of the bulbs 31 to 33). 20 to 28 mm). Although it is preferable that the maximum diameter b1 is narrow, the above-mentioned dimensions are used from the viewpoint of manufacturing technology.

  As shown in FIGS. 1 to 5, the holder 15 is formed of a heat-resistant synthetic resin material such as polybutylene terephthalate (PBT), for example, and includes a disk-shaped substrate portion 42 and the substrate portion 42. And a cylindrical tube portion 43 protruding from the peripheral edge to one end side. A protrusion 44 is formed at the center of the substrate portion 42 so as to be inserted between the bulbs 31 to 33 of the arc tube 14. The peripheral surface of the projecting portion 44 is a valve mounting portion 45 formed of a recessed portion for mounting the valve on each end portion side of each of the bulbs 31 to 33 and the peripheral surface portion facing the center side of the arc tube 14 is fitted. Is formed. Each of these valve mounting portions 45 is formed with a mounting hole 46 communicating with the inside of the holder 15.

  Further, through holes 47 are formed in the substrate portion 42 so as to face the end faces of the valves 31 to 33, and the wires 37 protruding from the end portions of the valves 31 to 33 are inserted into the insertion holes 47. Each thin tube 38 is inserted. The diameter of the insertion hole 47 is smaller than the diameter of the valves 31 to 33, and the end portions of the valves 31 to 33 do not enter the insertion hole 47.

  Then, after the arc tube 14 is combined with the holder 15, a process of injecting an adhesive such as silicone resin or epoxy resin from the inside of the holder 15 through the attachment holes 46 and the insertion holes 47 is performed. Accordingly, the inner peripheral surface side corresponding to the end side of each bulb 31 to 33 and corresponding to the center side of the arc tube 14 and the end surface of each bulb 31 to 33 are bonded and fixed to the holder 15.

  A claw portion 48 attached to the holder attachment portion 28 of the cover 13 is formed at one end portion of the cylindrical portion 43. A pair of substrate mounting portions 50 having a pair of substrate mounting grooves 49 facing each other at positions offset from the center line of the holder 15 are formed inside the cylindrical portion 43. The substrate mounting groove 49 is formed in parallel with the center line of the holder 15 and is formed to open to one end side of the cylindrical portion 43. In addition, a pair of notches 51 are formed in the cylinder portion 43 on the opposite side to the side where the pair of substrate mounting portions 50 are formed offset.

  Further, the globe 16 has a material such as transparent or light diffusing glass or synthetic resin, has an opening 54 with an outer diameter of 20 to 35 mm on one end side, and the other end is a hemispherical portion, The space from the opening to the hemispherical portion is formed in a cylindrical shape, and the maximum outer diameter is 30 to 50 mm (preferably 35 to 40 mm). The edge portion 55 of the opening 54 is fitted inside the cover portion 27 of the cover 13 and is bonded and fixed by an adhesive such as silicone resin or epoxy resin.

  Further, the lighting device 17 includes a substrate 58 on which a plurality of electronic components 60 constituting the lighting circuit 59 are mounted. The substrate 58 has a width dimension that allows insertion into the inner side of the base 12 and has a rectangular shape in which the height dimension is increased with respect to the width dimension. Both side edges of the substrate 58 are inserted into and engaged with a pair of substrate mounting grooves 49 in the holder 15, are arranged vertically along the central axis direction of the holder 15, and are offset with respect to the center line of the holder 15. Placed in position. That is, in a state where the base 12, the cover 13, and the holder 15 are combined, the substrate 58 is arranged vertically along the center line direction of the base 12 with respect to the inner side of the base 12, and is aligned with the center line of the base 12. It is arranged at an offset position. The position of the substrate 58 in the horizontal direction in FIG. 1 is temporarily fixed by the substrate mounting portion 50 of the holder 15, and the connection between the wire 37 of the arc tube 14 and a wrapping pin 61 described later, or between the base 12 and the holder 15. The position in the height direction is positioned by the pinching.

  Electronic components 60 are mounted on both sides of the substrate 58. Among these electronic components, large electronic components such as a transformer CT such as a ballast choke as a current limiting inductor, a capacitor C1, and an electrolytic capacitor C2 as a smoothing capacitor. The component 60 is mounted on one surface of the substrate 58 on the side where the distance from the base 12 is wide. Also, on the other surface of the substrate 58 where the distance between the substrate 58 and the base 12 is narrow, among the electronic components 60, surface mount type electronic components 60 such as low-profile transistors, chip-type capacitors and rectifiers. Is implemented. The MOS type N-channel field effect transistor Q1 and the MOS type P-channel field effect transistor Q2 which are transistors are mounted on the other surface of the substrate 58 as one package component.

  The smoothing electrolytic capacitor C <b> 2 is mounted in a direction perpendicular to the substrate 58 in a central region in the width direction of one surface of the substrate 58. Thereby, the mounting efficiency of the substrate 58 is improved, and the substrate 58 can be downsized.

  For example, the capacitor C <b> 1 in the electronic component 60 located on the side in the width direction of the substrate 58 close to the base 12 is inclined toward the center in the width direction of the substrate 58. Accordingly, the capacitor C1 can be inserted without contacting the inside of the base 12, and the lighting device 17 can be efficiently stored inside the base 12. The electronic component 60 to be inclined, such as the capacitor C1, is a discrete component, and is a radial component that is mounted on the substrate 58 with two lead wires.

  The substrate 58 is provided with four wrapping pins 61 projecting from the other end, which is the arc tube 14 side, by wrapping and connecting a pair of wires 37 in each electrode 36 of the arc tube 14. Further, a narrow tube 38 enclosing the main amalgam 39 is arranged on the side of the substrate 58 where the distance from the base 12 is narrow. Thereby, the lighting device 17 and the thin tube 38 are efficiently arranged inside the base 12.

  The offset amount of the substrate 58 with respect to the central axis in the base 12 is preferably in a range up to a position that is 3/4 of the inner diameter of the base 12. When the offset amount is closer to the inner surface of the base 12 than the position of 3/4, the width of the substrate 58 is narrowed, the mounting area of the substrate 58 is reduced, and the mounting efficiency of the electronic component 60 is reduced. Absent.

  In addition, a heat conductive member such as a heat conductive silicone resin is injected inside the base 12, and at least the electronic component 60 such as a transformer CT having a large calorific value and the base 12 side are heated by the heat conductive member. Connected. The heat conductive member may be filled in the entire inner side of the base 12 so as to cover the substrate 58 and the electronic component 60 of the lighting device 17.

  Next, FIG. 6 shows a circuit diagram of the lighting device 17. 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 circuit E. The smoothing electrolytic capacitor C2 in the input power circuit E is connected to an inverter main circuit 73 of a half-bridge inverter circuit 72 that is an AC power source that generates a high frequency.

  In the inverter main circuit 73, MOS-type N-channel field effect transistor Q1 and MOS-type P-channel field effect transistor Q2 which are complementary to each other, which are switching elements, are connected in series to a smoothing electrolytic capacitor C2. The sources of the N-channel field effect transistor Q1 and the P-channel field effect transistor Q2 are connected to each other.

  Between the drain and source of the field effect transistor Q2, a series circuit of the primary winding L2 of the unsaturated current transformer CT constituting the ballast choke of the resonant inductor, the DC cut capacitor C3, and the resonant capacitor C4 is connected. . One end of each of the electrode filament coils FLa and FLb in the fluorescent lamp FL which is the arc tube 14 is connected to the resonance capacitor C4, and between the other end of one electrode filament coil FLa and the other electrode filament coil FLb. A similar capacitor C5 that contributes to resonance is connected to the resonance capacitor C4. 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. A series circuit of a capacitor C6 and a capacitor C7 is connected between the gate of the field effect transistor Q1 and the gate of the field effect transistor Q2 and the source of the field effect transistor Q1 and the field effect transistor Q2. In parallel to the series circuit of the capacitor C6 and the capacitor C7 of the gate control circuit 76 constituting the gate control means, the zener diode ZD1 and the zener diode ZD2 for protection at the gate of the field effect transistor Q1 and the gate of the field effect transistor Q2 are connected. A series circuit is connected. Further, a secondary winding L3 is magnetically coupled to the primary winding L2 of the transformer CT, and the secondary winding L3 is an inductor having one end connected to a connection point between the capacitor C6 and the capacitor C7. It is connected to the connection point between the other end of L4 and the discharging resistor R2. The capacitor C6 also constitutes a trigger element of the starting circuit 75, and the discharging resistor R2 of the starting circuit 75 is connected in parallel to the series circuit of the capacitor C6 and the inductor L4.

  Between the drain and source of the field effect transistor Q2, a parallel circuit of the resistor R3 of the starting circuit 75 and a capacitor C8 for improving switching is connected. Further, negative temperature characteristic resistance elements (Negative Temperature Coefficients) NTC1 and NTC2 are connected to one end and the other end of each of the electrode filament coils FLa and FLb of the fluorescent lamp FL. The positive temperature characteristic resistance element PTC1 and the negative temperature characteristic resistance elements NTC1, NTC2 and the like may be connected so as to be wound around the wrapping pin 61 of the substrate 58 so as to be close to the arc tube 14.

  Next, the operation of the lighting device 17 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 through 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, the capacitor C3, the resonant capacitor C4, and the capacitor C5 of the transformer CT, and the primary winding L2, the capacitor C3, the resonant capacitor C4, and the 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, the inductance component of the primary winding L2 of the transformer CT has a magnitude that can be almost ignored as a resonance synthesis component. A voltage 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 inherently resonates to turn on the field effect transistor Q1 at a substantially constant frequency. A voltage for turning off the effect transistor Q2 is generated.

  Next, when the resonance voltage of the primary winding L2, the capacitor C3, the resonance capacitor C4, and the 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 uses the 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 thus 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.

  Part of the resonance current also flows through the capacitor C5, which is a part of the resonance capacitor, via the electrode filament coils FLa and FLb of the fluorescent lamp FL, so that the electrode filament coils FLa and FLb are sufficient until the resonance voltage rises. It is preheated directly over a long time. Further, by providing a resonance capacitor C5 separately from the resonance capacitor C4, the capacitance for resonance is divided. The capacitance of the capacitor C5 is preheated to the electrode filament coils FLa and FLb and the fluorescent lamp FL is turned on. It is possible to make the current flowing occasionally appropriate, and the electrode filament coils FLa and FLb can be preheated efficiently, and the current flowing to the capacitor C5 can be reduced after the fluorescent lamp FL is turned on. Can also be prevented.

  Further, when 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 voltage rises to a voltage necessary for starting the lamp, the fluorescent lamp FL starts to discharge, starts and lights up. To do.

  After the fluorescent lamp FL is lit, the resonance voltage decreases because the resistance value of the positive temperature characteristic resistance element PTC1 is about several tens kΩ and the equivalent resistance value of the fluorescent lamp FL is sufficiently smaller than the resistance value of the positive temperature characteristic resistance element PTCI. Thus, the fluorescent lamp FL 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 as described above, the current flowing through the electrode filament coils FLa and FLb can be reduced, so that the power loss can be reduced accordingly. Can be suppressed.

  Thus, since the preheating of the electrode filament coils FLa and FLb of the fluorescent lamp FL can be made appropriate by the change in 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 fluorescent lamp FL can be improved.

  In addition, when the temperature of the negative temperature characteristic resistance elements NTC1 and NTC2 before the start of the fluorescent lamp FL is low, the resistance values of the negative temperature characteristic resistance elements NTC1 and NTC2 are high. Flows through the electrode filament coils FLa and FLb, and preheats the electrode filament coils FLa and FLb appropriately. Further, 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 fluorescent lamp FL. The temperature rises under the influence of the heat and the resistance values of the negative temperature characteristic resistance elements NTC1, NTC2 decrease. As a result, the current flowing in the electrode filament coils FLa and FLb gradually flows in the negative temperature characteristic resistance elements NTC1 and NTC2.

  Further, when the temperature of the negative temperature characteristic resistance elements NTC1 and NTC2 is increased after the fluorescent lamp FL is turned on and the resistance value is lowered as much as possible, most of the resonance current flows to the negative temperature characteristic resistance elements NTC1 and NTC2, and the electrode filaments. Since almost no current flows through the coils FLa and FLb, the power loss due to the electrode filament coils FLa and FLb can be reduced as much as possible.

  The substrate 58 includes an input power circuit E connected to the base 12, an inverter circuit 72 connected to the input power circuit E, and a light emission from one end side on the base 12 side to the other end side on the arc tube 14 side. The output part of the inverter circuit 72 connected to the pipe 14 is formed in order. Thereby, the wiring patterns formed on the substrate 58 are arranged in order in one direction from the input side to the output side, and the substrate 58 can be miniaturized.

  Next, the assembly of the bulb-type fluorescent lamp will be described. The one end side of the arc tube 14 and the holder 15 are combined, and an adhesive is injected from the inside of the holder 15 through the mounting holes 46 and the insertion holes 47 to bond and fix the one end side of the arc tube 14 and the holder 15. Subsequently, both side edges of the substrate 58 are inserted into the pair of substrate mounting grooves 49 of the holder 15, the substrate 58 is inserted inside the holder 15, and each wire 37 of the arc tube 14 drawn out inside the holder 15. Are wound around each wrapping pin 61 of the substrate 58 and connected (illustration of this wound state is omitted). Subsequently, the holder 15 and the cover 13 are combined and combined. Next, an electric wire (not shown) connected in advance from the input portion side of the substrate 58 is connected to the shell 21 and the eyelet 23 of the base 12, and the base 12 is fitted to the cover 13 and fixed by caulking or bonding. Subsequently, by injecting a heat conductive member into the base 12 through the notch 51 of the holder 15 with the base 12 facing down and the arc tube 14 facing upward, at least the notch 51 side of the holder 15 A heat conductive member is filled between the electronic component 60 such as a transformer CT located opposite to the base 12 and the cover 13 side, or the entire inside of the base 12 is filled with a heat conductive member. Subsequently, the luminous bulb 14 is covered with a globe 16 and the globe 16 is fixed to the cover 13 with an adhesive. With this configuration, light is emitted from a portion close to the base 12, and the light emission efficiency can be improved.

  As shown in FIG. 7, for example, a lighting device 81 that is a downlight has a lighting fixture body 82, and a socket 83 and a reflector 84 are attached to the lighting fixture body 82. A fluorescent lamp 11 is mounted. In this case, since the outer diameter of the globe 16 is smaller than that of the A-shaped bulb-type fluorescent lamp in the JIS standard, the inner diameter of the reflector 84 can be reduced, and the downsizing of the lighting fixture can be achieved. Various things can be provided according to the application. In addition, the lamp of the present invention can be mounted in a narrow portion where an A-shaped bulb-type fluorescent lamp cannot be attached.

  The bulb-type fluorescent lamp 11 configured as described above has a substrate 58 formed in a width dimension that can be inserted inside the base 12 in a vertical shape along the direction of the center line of the base 12 and Since the large electronic component 60 in the electronic component 60 can be disposed on one surface having a large distance from the base 12 of the substrate 58 by being disposed at a position offset with respect to the center line, the lighting device 17 is disposed inside the base 12. The cover 13 can be efficiently stored, and the cover 13 can be downsized.

  Since the electronic component 60 located on the width direction edge portion side of the substrate 58 approaching the base 12 is inclined toward the width direction center portion side of the substrate 58, the electronic component 60 is inserted without hitting the inside of the base 12 The lighting device 17 can be efficiently stored inside the base 12.

  The smoothing electrolytic capacitor C2 having a relatively high height among the electronic components 60 to be mounted on the substrate 58 can be mounted in the center region in the width direction on one surface of the substrate 58 in the direction perpendicular to the substrate 58. Mounting efficiency is improved, and the substrate 58 can be miniaturized.

  The input power supply circuit E, the inverter circuit 72, and the output portion of the inverter circuit 72 are formed in this order from one end side of the substrate 58 on the base 12 side to the other end side of the substrate 58 on the arc tube 14 side. The wiring patterns to be arranged can be arranged in one direction in order from the input side to the output side, and the substrate 58 can be miniaturized.

  The main amalgam 39 of the narrow tube 38 of the arc tube 14 is enclosed by arranging the substrate 58 formed in a width dimension that can be inserted inside the base 12 in a vertical shape along the direction of the center line of the base 12. The leading end portion can be arranged between the base 58 inside the base 12 and the lighting device 17 and the thin tube 38 inside the base 12 while reducing the thermal influence from the arc tube 14 during lighting on the main amalgam 39. Can be arranged efficiently, whereby the cover 13 can be miniaturized.

  Since the substrate 58 is disposed at a position offset with respect to the center line of the base 12 and the thin tube 38 is disposed between the surface of the substrate 58 and the base 12 where the distance from the base 12 is narrow, the distance between the base 58 and the base 12 is small. The large electronic component 60 can be disposed on the wide surface side, and the lighting device 17 and the thin tube 38 can be efficiently disposed inside the base 12.

  As shown in FIG. 1, the bulb-type fluorescent lamp 11 configured in this way has a maximum width b1 in the width direction of the arc tube 14 having bulbs 31 to 33 having a tube outer diameter of 3 to 8 mm, which is 30 mm or less. The ratio of the externally exposed length (height dimension) h2 of the cover 13 exposed from the base 12 to the lamp length h1 excluding the base 12 can be formed at 0 to 25%. If this ratio is greater than 25%, the light emitted from the arc tube 14 is blocked, and the overall height of the bulb-type fluorescent lamp is increased. Further, the maximum outer diameter b2 of the cover 13 is 1.1 to 1.5 times the outer diameter dimension b3 of the base 12, or 0.6 to 1.0 times the maximum outer diameter b4 of the globe 16, and The outer diameter of the opening can be 20 to 35 mm (preferably 25 to 30 mm). Thereby, it becomes difficult for the heat radiated from the arc tube to be transferred to the lighting device 17 through the opening 54 of the globe 16, and the temperature rise of the lighting device 17 can be suppressed. Further, by setting the maximum outer shape of the globe 16 to a predetermined value or less, a slim appearance can be obtained as compared with an incandescent bulb or the like. Note that the ratio of the externally exposed length (height dimension) h2 of the cover 13 exposed from the base 12 to the lamp length h1 excluding the base 12 is 0% when the bulb-type fluorescent lamp 11 is viewed from the width direction. In this case, the edge 55 of the opening 54 of the globe 16 is fitted to the shell 21 of the base 12.

  Furthermore, the bulb-type fluorescent lamp 11 is fixed to the bulb mounting portion 45 of the holder 15 facing the bulbs 31 to 33 from the center side of the arc tube 14 with the inner peripheral surface side of one end side of the bulbs 31 to 33 with an adhesive. Therefore, the outer peripheral surface side of one end side of the bulbs 31 to 33 is not blocked by the holder 15, and the light emitted from the outer peripheral surface side of the one end side of the bulbs 31 to 33 can be used, and the light emission efficiency can be improved.

  In FIG. 8, the light distribution curve of the light bulb-type fluorescent lamp 11 according to the present embodiment is A, the light distribution curve of the conventional light bulb-type fluorescent lamp is B, the light distribution curve of the incandescent light bulb is C, and the base 12 is moved upward. The light distribution characteristic figure when it is made to turn on is shown. In the light distribution curve A of the bulb-type fluorescent lamp 11 according to the present embodiment, the light distribution toward the base 12 is improved to be close to the light distribution curve B of the conventional product, and is close to the light distribution curve C of the incandescent lamp. It was. Further, as apparent from the light distribution curve A of the bulb-type fluorescent lamp 11 according to the present embodiment, a large value is continuously obtained in the cylindrical portion of the globe 16, and light irradiation from the cylindrical portion of the globe 16 is performed. It is possible to configure the luminaire used.

  Thus, the bulb-type fluorescent lamp 11 is thinner and smaller than an incandescent bulb and the like, can be applied to a narrow space, has a light distribution characteristic that can use light irradiation from the cylindrical portion of the globe 16, and an incandescent bulb. Thus, it is possible to improve the application rate to a lighting fixture in which a lamp is mounted in a narrow space where a general lighting bulb cannot be used.

  In addition, a heat conductive member is injected inside the base 12, and the electronic component 60 such as a transformer CT having a large calorific value is thermally connected to the base 12 side by this heat conductive member. Heat can be dissipated efficiently.

  Note that the number of bulbs 31 to 33 of the arc tube 14 is not limited to three, and two or four or more may be provided in parallel to increase the discharge path length.

  FIGS. 9 to 11 show a second embodiment, FIG. 9 is a side view of an arc tube of a bulb-type fluorescent lamp, FIG. 10 is a perspective view showing a holder of the bulb-type fluorescent lamp, and FIG. It is a perspective view which shows another example about the holder of a fluorescent lamp. As shown in FIG. 9, the arc tube 14 uses a bulb 91 having a discharge path length of 250 to 500 mm and a tube outer diameter of 3 to 8 mm, and a pair of electrode side ends where the pair of electrodes 36 are sealed. The portion 40 is bent in a spiral shape so as to be positioned on one end side in the height direction.

  The pair of electrode-side end portions 40 are projected in parallel to the height direction, and a pair of wires 37 and a thin tube 38 are respectively projected from the tip. One narrow tube 38 extends long so as to be disposed inside the base 12, and a main amalgam 39 is enclosed at the tip thereof.

  As shown in FIG. 10, the holder 15 has an arcuate bulb attachment in which the peripheral surface of the projection 44 is fitted to the end surface side of the bulb 91 and the inner peripheral surface side facing the center side of the arc tube 14. A portion 45 is formed, and each valve attachment portion 45 is formed with an attachment hole 46 communicating with the inside of the holder 15.

  As shown in FIG. 11, when the arc tube 14 is spirally bent up to the pair of electrode side end portions 40, each spiral electrode side is provided on the peripheral surface of the protrusion 44 of the holder 15. A valve mounting portion 45 and a mounting hole 46 that are engaged with the inner peripheral side of the end portion 40 are formed.

  Then, after the arc tube 14 is combined with the holder 15, an adhesive such as silicone resin or epoxy resin is injected from the inside of the holder 15 through each mounting hole 46, so that the arc tube on the end side of the bulb 91. A peripheral surface portion facing the center side of 14 is bonded and fixed to the holder 15.

  Even the bulb-type fluorescent lamp 11 using the spiral arc tube 14 can be formed in the same dimensional relationship as that of the first embodiment described above, and is thinner and smaller than an incandescent bulb and can be applied to a narrow space. The light distribution characteristic that can use the light irradiation from the cylindrical portion of the globe 16 is obtained, and it is applied to a lighting fixture that mounts a lamp in a narrow space where a general lighting bulb such as an incandescent bulb cannot be used. The rate can be improved.

  In each of the above embodiments, the globe 16 can be omitted and the arc tube 14 can be exposed. In this case, the same effect as that of the bulb-type fluorescent lamp using the globe 16 can be obtained. .

  Further, in each of the above embodiments, the cover 13 is omitted, the lighting device 17 is accommodated in the base 12, and the edge 55 of the opening 54 of the globe 16 is fitted and bonded to the inside of the shell 21 of the base 12. You may fix using an agent.

Sectional drawing seen from the juxtaposition direction of the bulb | bulb in the lightbulb-type fluorescent lamp which shows 1st Embodiment based on this invention. Sectional drawing seen from the direction which cross | intersects with the juxtaposition direction of the bulb | bulb in the lightbulb-type fluorescent lamp which shows 1st Embodiment based on this invention. Sectional drawing which removed the cover and globe of the bulb-type fluorescent lamp which shows 1st Embodiment based on this invention, and was seen from the holder side. 1 is a perspective view of a holder for a bulb-type fluorescent lamp showing a first embodiment according to the present invention. FIG. The perspective view inside the holder combined with the arc tube of the lightbulb-type fluorescent lamp which shows 1st Embodiment based on this invention. BRIEF DESCRIPTION OF THE DRAWINGS The circuit diagram of the lighting device of the lightbulb-type fluorescent lamp which shows 1st Embodiment based on this invention. BRIEF DESCRIPTION OF THE DRAWINGS Schematic of the illuminating device using the lightbulb-type fluorescent lamp which shows 1st Embodiment based on this invention. The light distribution characteristic view of the lightbulb-type fluorescent lamp which shows 1st Embodiment based on this invention. The side view of the arc tube of the lightbulb-type fluorescent lamp which shows 2nd Embodiment concerning this invention. The perspective view which shows the holder of the lightbulb-type fluorescent lamp which shows 2nd Embodiment based on this invention. The perspective view which shows the other example of the holder in the lightbulb-type fluorescent lamp which shows 2nd Embodiment based on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Light bulb-type fluorescent lamp 12 Base 13 Cover 14 Light emission tube 15 Holder 16 Globe 17 Lighting device 31, 32, 33, 91 Valve 40 Electrode side edge 45 Valve attachment part 81 Illuminating device 82 Lighting fixture main body 83 Socket

Claims (4)

An arc tube having a maximum diameter of 30 mm formed by bending a bulb having a tube diameter of 3 to 8 mm;
A lighting device for lighting the arc tube;
A glove having an opening having a diameter of 20 to 35 mm on one end side and a substantially cylindrical shape between the opening and the top of the other end, and having a maximum outer diameter of 50 mm including the arc tube;
A cover that houses the lighting device, has a base attached to one end, has an external exposure length of 0 to 25% with respect to the lamp length excluding the base, and communicates with the opening of the globe on the other end;
A bulb-type fluorescent lamp characterized by comprising: An arc tube having a maximum diameter of 30 mm formed by bending a bulb having a tube diameter of 3 to 8 mm;
A lighting device for lighting the arc tube;
A glove having an opening on one end side, formed in a substantially cylindrical shape from the opening to the top on the other end, and having a maximum outer diameter of 50 mm including the arc tube;
The lighting device is housed, the base is attached to one end, the maximum outer diameter is 0.6 to 1.0 times the maximum outer diameter of the glove, and it is 1.1 to 1.5 times the outer diameter of the base And a cover whose other end is attached to the opening of the glove;
A bulb-type fluorescent lamp characterized by comprising: The bulb-type fluorescent lamp according to claim 1 or 2, wherein the maximum outer diameter of the globe is 1.0 to 1.6 times the outer diameter of the cap. A lighting fixture body;
A socket attached to the luminaire body;
The bulb-type fluorescent lamp according to any one of claims 1 to 3, which is attached to a socket;
An illumination device comprising:

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