JP4026072B2 - Light bulb-type fluorescent lamp and lighting fixture - Google Patents

Description

  The present invention relates to a light bulb shaped fluorescent lamp and a lighting fixture.

  Conventionally, for example, a bulb-type fluorescent lamp having a cover having a base that can be attached to a socket of a general lighting bulb, storing a lighting circuit inside the cover, and bending the arc tube into a globe is known. It has been.

  The specifications of the main light bulb-type fluorescent lamps currently on the market are as follows: the height including the base is about 130 mm, the outer diameter is about 70 mm, the arc tube outer diameter is about 12 mm, the discharge path length is about 280 mm, The wall thickness is 1.1 mm or more, and the lamp power is about 13 W. However, in the configuration of the fluorescent lamp in which such an arc tube is arranged, it is difficult to reduce the size so as to correspond to a general lighting bulb, and further downsizing is desired.

  On the other hand, for example, there is known a fluorescent lamp in which an arc tube having three U-shaped bent bulbs is arranged so as to be on each side of a regular triangle. However, in this fluorescent lamp, details about the size and shape of the arc tube and the lamp lighting conditions associated with the miniaturization have not been studied, and thus an optimum configuration for miniaturization has not been realized (for example, Patent Document 1). reference).

  Further, in the fluorescent lamp described in Patent Document 1, the arc tube is formed in a substantially U shape with a corner portion bent about 90 degrees. When the arc tube is housed in a small glove similar to a general lighting bulb, the corner portion is close to the glove, resulting in problems such as uneven brightness.

Further, when the fluorescent lamp is downsized, there is a concern about the thermal influence from the arc tube on the lighting circuit housed inside the cover. Therefore, for example, a configuration is known in which a circuit board on which components of a lighting circuit are mounted is disposed at a position avoiding the electrode side end of the arc tube, such as a fluorescent lamp (see, for example, Patent Document 3). However, since the circuit board is also miniaturized with the miniaturization of the fluorescent lamp, there is a problem that the mounting space for components is reduced.
Japanese Patent Laid-Open No. Sho 62-12051 JP-A-8-273615

  As described above, since the conventional fluorescent lamp has a larger outer dimension than a general lighting bulb, it cannot be applied to a lighting fixture that uses a general lighting bulb instead of the general lighting bulb. Have a problem.

  This invention is made | formed in view of such a point, and it aims at providing the light bulb-type fluorescent lamp and lighting fixture corresponded to the light bulb for general illumination.

The bulb-type fluorescent lamp according to claim 1 is a cover having a base at the top ; a substrate portion having a disk shape and an attachment hole formed in a cylindrical shape projecting upward from the periphery of the substrate portion A partition plate having a piece; a substantially disk-shaped circuit board that is attached so as to be fitted to the attachment piece of the partition plate; a plurality of circuit components mounted on the circuit board; was made a circuit side wire, and a lighting circuit housed in the cover; and the general incandescent bulb and globe attached to cover substantially a same shape; end is inserted and fixed in the mounting hole of the partition plate, An arc tube having a lamp-side wire led out from an end portion, twisted together with the circuit-side wire and connected so that each tip is located on the base side of the circuit board surface, and housed in a globe ; not include the It is characterized in.

  The bulb-type fluorescent lamp according to claim 2 is the bulb-type fluorescent lamp according to any one of claims 1 to 3, wherein the lighting circuit includes an N-channel transistor and a P-channel connected in series to the input power source. Half-bridge inverter main circuit having at least a pair of transistors as a main switching element for generating a high-frequency voltage, a ballast choke for stably lighting an arc tube connected to the inverter main circuit, and a magnet for the ballast choke And a control means for driving each transistor by the secondary winding, which has a secondary winding common to the N-channel and P-channel transistors connected to each other.

  With this configuration, the N-channel transistor and the P-channel transistor are operated by the control means, so that the circuit configuration can be simplified by controlling each to a different state by the output of one control means. And by using such a lighting circuit with a small number of parts, miniaturization of the light bulb-type fluorescent lamp is further promoted.

  According to a third aspect of the present invention, there is provided a lighting fixture comprising the bulb-type fluorescent lamp according to the first or second aspect.

According to the bulb-type fluorescent lamp of claim 1, the lamp-side wire led out from the end of the arc tube is twisted together with the circuit-side wire so that the respective tips are located on the base side of the circuit board surface. Compared to the configuration in which the lamp-side wire is connected to the columnar pin protruding from the circuit side derived from the lighting circuit, it can be reduced in size without occupying a relatively large space. In addition, since there is no need for dedicated parts, it can be connected easily and reliably at low cost.

  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, the control means operates the N-channel transistor and the P-channel transistor. Each of the outputs can be controlled to be in different states, the circuit configuration can be simplified, and the use of such a lighting circuit with a small number of components further promotes downsizing of the bulb-type fluorescent lamp.

  According to the lighting fixture according to claim 3, since the light bulb shaped fluorescent lamp according to claim 1 or 2 is provided, it is possible to use a lighting fixture in which a general lighting bulb is used.

  Hereinafter, an embodiment of a light bulb shaped fluorescent lamp and a lighting fixture of the present invention will be described with reference to the drawings.

  FIG. 1 to FIG. 11 show a first embodiment, FIG. 1 is a side view through which a globe of a bulb-type fluorescent lamp is seen through, FIG. 2 is a bottom view through which the globe of a bulb-type fluorescent lamp is seen through, and FIG. FIG. 4 is an explanatory view showing a lighting circuit and an arc tube, FIG. 5 is a side view of a U-shaped bent bulb, and FIG. 6 is a sectional view of a portion of a U-shaped bent bulb. 7 is an explanatory view showing the connection state of the lighting circuit and the arc tube, FIG. 8 is a graph showing the relationship between the tube outer diameter of the U-shaped bent bulb, the lamp efficiency, and the maximum width of the arc tube, and FIG. FIG. 10 is a light distribution diagram of a bulb-type fluorescent lamp, and FIG. 11 is a circuit diagram of a lighting circuit.

  1 to 3, reference numeral 10 denotes a bulb-type fluorescent lamp. The bulb-type fluorescent lamp 10 has a cover 14 having a base 12, a lighting circuit 16 accommodated in the cover 14, and translucency. A globe 17 and an arc tube 18 housed in the globe 17 are provided. The envelope composed of the globe 17 and the cover 14 is formed in an outer shape that approximates the standard size of a general lighting bulb such as an incandescent bulb equivalent to a rated power of 60 W type. That is, the height H1 including the base 12 is about 110 to 125 mm, the diameter, that is, the outer shape D1 of the globe 17 is about 50 to 60 mm, and the outer shape D2 of the cover 14 is about 40 mm. The general lighting bulb is defined in JIS C 7501. In the following description, the base 12 side is the upper side and the globe 17 side is the lower side.

  The cover 14 includes a cover main body 21 formed of a heat resistant synthetic resin such as polybutylene terephthalate (PBT). The cover main body 21 has a substantially cylindrical shape that expands downward, and has a top 12 covered with a base 12 such as an E26 type, and is fixed by an adhesive or caulking.

  The globe 17 is transparent or light diffusing milky white or the like, and is formed of glass or synthetic resin into a smooth curved surface having substantially the same shape as a glass bulb of a general lighting bulb equivalent to a rated power of 60 W type. In addition, a fitting edge 17a that fits inside the opening at the lower end of the cover 14 is formed at the edge of the opening. The globe 17 can be combined with another member such as a diffusion film to improve luminance uniformity.

  As shown in FIGS. 1, 3 and 4, the lighting circuit 16 accommodated in the cover 14 includes a disk-like circuit board 24 arranged horizontally, that is, perpendicular to the longitudinal direction of the arc tube 18. Inverter circuit (high-frequency lighting circuit) that performs high-frequency lighting by mounting a plurality of components (electrical parts) 25 and 26 on both surfaces of the circuit board 24, that is, the upper surface on the base 12 side and the lower surface on the arc tube 18 side ) Is configured.

  Among the plurality of components 25 and 26, the upper surface of the circuit board 24 is mounted with components 25 such as an electrolytic capacitor and a film capacitor having relatively low heat resistance, and the lower surface of the circuit board 24 has relatively high heat resistance. In addition, a chip-shaped REC (rectifier, rectifier, diode bridge), transistor, resistor, and other components 26 having a thickness of about 2 to 3 mm are mounted.

  The circuit board 24 is substantially disc-shaped and has a diameter (maximum width dimension) that is not more than 1.2 times the maximum width D3 in the direction in which the U-shaped bent valves 31 are arranged in parallel. From the circuit board 24, two pairs, that is, four circuit-side wires 28 serving as output portions are led out. Note that wrapping pins may be implanted in the circuit board 24 instead of the circuit-side wire 28.

  As shown in FIGS. 1 to 6, the arc tube 18 accommodated in the globe 17 has three U-shaped bent bulbs 31 having substantially the same shape arranged at predetermined positions and sequentially connected by a communication tube 32. Connected to form one discharge path.

  Each U-shaped bent bulb 31 has a phosphor film formed on the inner surface, and is filled with a rare gas such as argon and mercury. Each U-shaped bent valve 31 is a glass cylindrical valve having a tube outer diameter d1 of 8 to 11 mm, a tube inner diameter d2 of 6 to 9 mm, and a wall thickness of 0.7 to 1.0 mm. A valve of about 110 to 130 mm is smoothly curved at the middle portion, and is formed in a substantially U shape with a top portion P. That is, each U-shaped bent valve 31 includes a bent portion 31a that smoothly inverts and a pair of parallel straight portions 31b that are continuous with the bent portion 31a. The arc tube 18 has a bulb height H2 of 50 to 60 mm, a discharge path length of 200 to 300 mm, and a maximum width D3 in the bulb parallel direction of 32 to 43 mm.

  The arc tube 18 is attached to a partition plate 33 as a support member which is a fluorescent lamp fixing member and a lighting circuit fixing member, and the partition plate 33 is fixed to the cover 14. That is, the partition plate 33 includes a disk-shaped substrate portion 34, and an end portion of each U-shaped bent valve 31 is inserted into an attachment hole 34a formed in the substrate portion 34 and then adhesive is used. The arc tube 18 is fixed to the partition plate 33 by bonding or the like. A fitting step 35 is formed from the outer peripheral portion of the substrate portion 34 toward the upper side and further toward the outer side. Then, the fitting step 35 is fitted inside the cover 14, and the fitting edge portion 17a of the globe 17 is fitted between the fitting step 35 and the cover 14. These members are fixed to each other by filling the adhesive 37 between the step portion 35 and the cover 14. Further, a mounting piece 38 having a cylindrical shape or the like is projected on the upper side of the fitting step 35, and the circuit board 24 of the lighting circuit 16 is attached to the mounting piece 38 by fitting or bonding. It has been.

  Further, the arc tube 18 is housed in a predetermined position in the globe 17 with the bulb-type fluorescent lamp 10 assembled in this manner. That is, in this state, the tops P of the U-shaped bent bulbs 31 are positioned at equal intervals on one circumference centered on the central axis whose longitudinal direction is the vertical direction of the bulb-shaped fluorescent lamp 10. Further, the straight portions 31b of the U-shaped bent bulbs 31 are also positioned at substantially equal intervals on a predetermined circumference centered on the central axis of the lamp. That is, as shown in FIG. 9, the tube axis of the straight portion 31b of the three U-shaped bent bulbs 31 of the arc tube 18 is positioned substantially at the apex P of the regular hexagon. The interval w1 between the straight portions 31b of the U-shaped bent valve 31 is substantially equal to the interval w2 between the adjacent U-shaped bent valves 31, and this interval w (w1, w2) is defined within a range of 1 to 5 mm. ing. The interval w (w1, w2) is in the range of 1 to 5 mm, but 2 to 3 mm is preferable in production, and if it exceeds 5 mm, it may not contribute to miniaturization.

  With reference to FIGS. 8 and 9, the meaning of the numerical values where the maximum width a of the arc tube 18 is 32 to 43 mm and the outer diameter d1 of the U-shaped bent bulb 31 is 8 to 11 mm will be described. .

  In FIG. 8, when the arc tube 18 has a wall thickness of 0.8 mm, a gas pressure of 400 Pa, a discharge path length of 250 mm, and a lamp current of 0.2 A, the lamp efficiency is shown and the interval w is 5 mm. The relationship between the pipe outer diameter d1 and the maximum width a is shown for the example and the 2 mm example.

  In order to approximate the appearance of a general lighting bulb and increase the adaptability to a luminaire using the general lighting bulb, the outer diameter of the globe 17 must be 45 mm or less (preferably about 40 mm), Considering the clearance between the inner surface of the globe 17 or the cover 14 and the outer periphery of the arc tube 18, the upper limit of the maximum width a of the arc tube 18 is set to 43 mm.

  The lower limit of the tube outer diameter d1 was 8 mm at which the relative lamp efficiency was 97% or more.

  The upper limit of the tube outer diameter d1 was defined based on the equation of a = 3d1 + 2w from the upper limit 43 mm of the maximum width a of the arc tube 18. At this time, the tube axes of the straight portions 31b of the three U-shaped bent bulbs 31 of the arc tube 18 are positioned substantially at the apex of the regular hexagon (w1 and w2 are substantially equal). Therefore, by applying the maximum value (a: 43, w: 5) to the equation of a = 3d1 + 2w and obtaining the value of d1 from 43 = 3d1 + 2 × 5, the upper limit of the tube outer diameter d1 is 11 mm. It was.

  The lower limit of the maximum width a of the arc tube 18 is obtained by calculating the value of a from a = 3 × 8 + 2 × 2 by applying the formula of a = 3d1 + 2w and the minimum value (d1: 8, w: 2). 28 mm.

  The reason why the lower limit of the inner diameter of the tube is 6 mm is that the starting voltage is increased below 6 mm, which is not practical.

  Furthermore, when the thickness is 1.1 mm or more, a glass pool is generated inside the bent portion 31a bent in a U-shape, and cracks are easily generated from the inside of the bent portion 31a. By setting the thickness to 1.0 mm, it is possible to suppress the occurrence of the accumulation of glass inside the bent portion 31a.

  The minimum gap between the globe 17 and the top P of the arc tube 18 is A1, the minimum gap between the maximum outer diameter of the globe 17 and the arc tube 18 is A2, and the minimum gap between the end of the globe 17 and the arc tube 18 is A2. When A3 is assumed, the relationship is defined as A2> A1 ≧ A3. A1 is about 2 to 8 mm, A2 is about 3 to 13 mm, and A3 is about 2 to 8 mm.

  In FIG. 10, the light distribution S1 of the bulb-type fluorescent lamp 10 having a relationship of A2> A1.gtoreq.A3 and the light distribution S2 of a conventional bulb-type fluorescent lamp having a cylindrical envelope and a relationship of A2 = A3. It shows. The 0 ° direction corresponds to the top direction of the arc tube 18, the 180 ° direction corresponds to the base 12 direction, and the 90 ° direction corresponds to the side surface direction of the arc tube 18.

  The light distribution S1 in the case of A2> A1 ≧ A3 increases the light distribution in the direction of the base 12 compared to the light distribution S2 in the case of A2 = A3, and approximates the light distribution of a general lighting bulb. That is, since A2 is larger than A3, the amount of light diffused from the side surface of the globe 17 toward the base 12 increases, and the light distribution illuminance in the direction of the base 12 increases. In addition, by making A1 a relationship of A2> A1 ≧ A3, that is, a relationship of 2 mm> A1> 8 mm, the light distribution in the top portion direction of the arc tube 18 can be enhanced. Therefore, by defining the relationship of A2> A1 ≧ A3 of the bulb-type fluorescent lamp 10, the optimum condition of the light distribution characteristic approximate to that of a general lighting bulb can be defined.

  When the bulb-type fluorescent lamp 10 defined in this way is used in a lighting fixture for a general lighting bulb, the light distribution of the bulb-type fluorescent lamp 10 approximates the light distribution of a general lighting bulb, so that A sufficient amount of light is applied to the reflector in the vicinity of the socket disposed in the socket, and the instrument characteristics as the optical design of the reflector can be obtained. Moreover, even in a lighting fixture where the image of the internal light source is projected on a cloth or other light diffusing cover, such as a light bulb stand, the light distribution of the bulb-type fluorescent lamp 10 should be close to that of a general lighting bulb. So it can be used without a sense of incongruity.

The surface brightness of the globe 17 was 380 cd / m ² when measured with a luminance meter BM-8 manufactured by Topcon Corporation. The total luminous flux was 810 lm.

  On the other hand, each U-shaped bent valve 31 is sealed at one end by a line seal using a mount or a pinch seal not using a mount, and the other end is a narrow tube 41 called an exhaust pipe. Are welded, exhausted, or provided with amalgam 42 as required. In addition, a filament coil 44 is supported by a pair of wells (introduction lines) 45 at the ends of each U-shaped bent bulb 31 positioned at both ends of the arc tube 18 by a line seal using a mount or the like. Are arranged. Each well 45 is connected to a lamp-side wire 48 led out of the U-shaped bent bulb 31 through a jumet wire 46 sealed to the glass at the end of the U-shaped bent bulb 31. Has been. One well 45 is provided with an auxiliary amalgam 49 as needed.

  Then, the two pairs, that is, the four lamp-side wires 48 led out from the arc tube 18 are twisted with the circuit-side wires 28 led out from the lighting circuit 16 as shown in FIG. 3, FIG. 4, and FIG. Combined and electrically and mechanically connected. Further, the wires 28 and 48 are inserted and guided in grooves formed in the rib-like attachment piece 38 of the partition plate 33. Therefore, it occupies a large space compared to the configuration in which a connector is provided in the lighting circuit 16 and the lamp side wire 48 is inserted and connected, and the configuration in which the lamp side wire 48 is wound around and connected to the columnar pin protruding from the lighting circuit 16. In addition, since the size can be reduced and no special parts are required, the wiring can be easily and reliably made at low cost. At this time, if the diameters of the circuit-side wire 28 and the lamp-side wire 48 are greatly different, the work of twisting them becomes difficult. Therefore, regarding the relationship between the diameter D28 of the circuit side wire 28 and the diameter D48 of the lamp side wire 48, it is easy and reliable by setting (0.9 × D28) <D48 <(1.1 × D28). Can be connected by twisting together. Furthermore, the number of twists is 3 turns or more, so that electrical and mechanical connection can be ensured. In addition, for example, a columnar portion may be provided on the upper side from the partition plate 33 and torsionally connected around the portions of the wires 28 and 48.

  Further, with respect to the thin tube 41 for exhausting each U-shaped bent valve 31, if the tube inner diameter d3 is smaller than the tube inner diameter d2 of the U-shaped bent valve 31, the exhaust efficiency is poor and the exhaust time is lengthened. On the other hand, if the diameter of the narrow tube 41 is increased, the wells 45 that seals at the same time as the narrow tube 41 cannot be secured with the outer surface of the narrow tube 41 or the inner surface of the U-shaped bent valve 31, which causes a sealing failure. As a result, the quality of the arc tube 18 may be degraded. In particular, the tube inner diameter of the U-shaped bent valve is more than three times the tube inner diameter of the thin tube, and the thin tube for exhausting is often located at one end in the longitudinal direction of the arc tube, so that the exhaust efficiency is high. Improvement was difficult. In this regard, in this embodiment, the tube inner diameter d3 of the narrow tube 41 is set within the range of 2.0 <(d2 / d3) <2.8 with respect to the tube inner diameter d2 of the U-shaped bent valve 31. In addition, the exhaust efficiency can be improved by increasing the tube inner diameter d3 of the narrow tube 41, the sealing property can be secured, and the quality of the arc tube 18 can be improved. It is to be noted that exhaust efficiency can also be improved by providing the narrow tube 41 serving as an exhaust tube in the middle portion of the arc tube 18 in the longitudinal direction.

  The bulb-type fluorescent lamp 10 configured in this way has an input power rating of 14 W, and the arc tube 18 is applied at a high frequency of 12.5 W, with a lamp current of 280 mA and a lamp voltage of 65 V. The total luminous flux is 810 lm due to the use of the light emitting phosphor.

  FIG. 11 is a circuit diagram illustrating the configuration of the lighting circuit 16. The lighting circuit 16 has an input power supply device E first. In the input power supply device E, a capacitor C1 constituting a filter is connected to a commercial AC power source e via a fuse F1, and the input terminal of the full-wave rectifier 101 is connected to the capacitor C1 via an inductor L1 constituting the filter. ing. A smoothing capacitor C2 is connected to the output terminal of the full-wave rectifier 101 via a resistor R1, and a half-bridge inverter main circuit 102 is connected to the capacitor C2.

  Inverter main circuit 102 is connected in series with a capacitor C2, and a field effect transistor Q1 as a MOS type N-channel transistor as a switching element and a field effect transistor Q2 as a MOS type P channel transistor are connected in series. Has been. 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, one end of the filament coils 44, 44 at both ends of the arc tube 18 is connected via a ballast choke L2 (also used as a resonance function in the present embodiment) and a DC cut capacitor C3. Are connected, and a starting capacitor C4 is connected between one end of one filament coil 44 and the other end of the other filament coil 44.

  A starting resistor R2 constituting the starting circuit 103 is connected between the connection point of the resistor R1 and the capacitor C2 and 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 are connected. Further, a series circuit of a capacitor C5 and a capacitor C6 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 C5 and the capacitor C6 of the control circuit 104 as a control means are connected. A series circuit of a Zener diode ZD1 and a Zener diode ZD2 for protecting the gates of the field effect transistor Q1 and the field effect transistor Q2 is connected in parallel to the series circuit. Further, a secondary winding L3 is magnetically coupled to the ballast choke L2, and a resonance circuit 106 of an inductor L4 and a capacitor C6 is connected to the secondary winding L3. Further, the resistor R3 of the starting circuit 103 is connected in parallel to the series circuit of the capacitor C5 and the inductor L4.

  Between the drain and source of the field effect transistor Q2, a parallel circuit of the resistor R4 of the starting circuit 103 and the capacitor C7 for improving switching is connected.

  The field effect transistors Q1 and Q2 may be bipolar. The inverter main circuit 102 may be, for example, a full bridge type having two or more pairs of switching elements connected in series with each other. Further, the arc tube 18 may be of a type in which both filament coils 44 are preheated or a type in which both filament coils 44 are not preheated.

  When the lighting circuit 16 is turned on, the voltage of the commercial AC power source e is full-wave rectified by the full-wave rectifier 101 and smoothed by the capacitor C2.

  First, a voltage is applied to the gate of the N-channel field effect transistor Q1 via the resistor R2, and the field effect transistor Q1 is turned on. When the field effect transistor Q1 is turned on, a voltage is applied to the circuit of the ballast choke L2, the capacitor C3, and the capacitor C4, and the ballast choke L2 and the capacitor C4 resonate. A voltage is induced in the secondary winding L3 of the ballast choke L2, and the inductor L4 and the capacitor C6 of the control circuit 104 inherently resonate to generate a voltage that turns on the field effect transistor Q1 and turns off the field effect transistor Q2. . Next, when the resonance voltage of the ballast choke L2 and the capacitor C4 is inverted, a voltage opposite to the previous voltage is generated in the secondary winding L3, and the control circuit 104 turns off the field effect transistor Q1 and turns on the field effect transistor Q2. Is generated. Further, when the resonance voltages of the ballast choke L2 and the capacitor C4 are 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 the arc tube 18 connected in parallel to the capacitor C4 starts while preheating one filament coil 44. When the voltage is applied, it starts and lights up.

  The Zener diode ZD1 and Zener diode ZD2 make the gate voltage of the field effect transistor Q1 and the field effect transistor Q2 constant and protect the gate from an excessive voltage.

  Therefore, since the N-channel and P-channel field effect transistors Q1 and Q2 are used and the N-channel field effect transistor Q1 is connected to the high potential side, the N-channel and P-channel field effect transistors are controlled by one control circuit 104. Q1 and Q2 can be controlled. Further, since the resonant circuit (inductor L4 and capacitor C6) is provided in the control circuit 104, the number of turns of the secondary winding L3 can be reduced, and the size can be reduced, and the control circuit 104 at no load and at load can be achieved. The change width of the output voltage can be reduced. That is, when the output voltage of the secondary winding L3 is simply output without providing the resonant circuit of the inductor L4 and the capacitor C6, depending on the relationship between the starting voltage of the arc tube 18 and the lamp voltage, The output voltage of the secondary winding L3 differs by almost 10 times or more between no load and load. With a Zener diode, it is difficult to stabilize the gate voltage and protect it, or an expensive Zener diode is required. Sometimes.

  According to this embodiment, a plurality of U-shaped bent bulbs 31 having a tube inner diameter of 6 to 9 mm are juxtaposed, the bulb height H2 is 50 to 60 mm, and the discharge path length is 200 to 200 mm. A height H1 of a cover 14 including an arc tube 18 that is 300 mm and configured so that a total luminous flux becomes 700 lm or more when the lamp power is lit at 7 to 15 W, and includes a base 12 to which the arc tube 18 is attached. By setting the distance to 110 to 125 mm, it is possible to define the optimum conditions of each component for making it correspond to the dimensions and total luminous flux of a general lighting bulb equivalent to a rated power of 60 W type. The reason why the lower limit of the inner diameter of the tube is 6 mm is that the starting voltage is increased below 6 mm, which is not practical.

  Further, an arc tube 18 having a tube outer diameter of 8 to 11 mm, a wall thickness of 0.7 to 1.0 mm, and a plurality of U-shaped bent bulbs 31 whose apex P has a curved shape is arranged in parallel. Therefore, it is possible to define the size of a general lighting bulb equivalent to a rated power of 60 W type and the tube diameter to be equivalent to the total luminous flux, and to increase the inner surface of the tube with the outer diameter of the tube and to ensure the strength. Can be defined. When the wall thickness is 1.1 mm or more, the inner diameter of the tube is relatively small with respect to the outer diameter of the tube, so that the surface area in the tube cannot be increased and the glass wall is accumulated inside the bent portion 31a bent in a U shape. Although cracks are likely to occur from the inside of the bent portion 31a, it is possible to suppress the occurrence of a glass pool inside the bent portion 31a by setting the thickness to 0.7 to 1.0 mm.

  Further, the circuit board 24 has a maximum width dimension that is 1.2 times or less the maximum width in the direction in which the U-shaped bent bulbs 31 of the arc tube 18 are arranged side by side, and the circuit board 24 on the side facing the arc tube 18 Since the component 26 with relatively high heat resistance is mounted on the surface and the component 25 with relatively low heat resistance is mounted on the opposite surface, the thermal effect of the components 25 and 26 mounted on the circuit board 24 is suppressed. The circuit board 24 can be downsized, and the portion of the cover 14 that accommodates the circuit board 24 can be downsized to a size corresponding to a general lighting bulb. The component 26 mounted on the surface of the circuit board 24 facing the arc tube 18 is arranged at a position away from the electrode of the arc tube 18, thereby suppressing the thermal effect on the component 26 due to heat generated from the electrode. it can. The circuit board 24 is preferably circular because the mounting space can be efficiently secured, but may be polygonal, such as a quadrangle, or an ellipse.

  The arc tube 18 is provided with three or more U-shaped bent bulbs 31 provided with a smoothly curved top portion P and sequentially connected, and the top portions P are arranged on the same circumference facing the inner surface of the globe 17. In addition, since the U-shaped bent bulbs 31 are arranged with an interval less than or equal to the outer diameter dimension, the arc tube 18 can be housed in the globe 17 that is miniaturized to have approximately the same shape as a general lighting bulb. At the same time, even when the arc tube 18 is housed in such a miniaturized globe 17, uneven brightness can be reduced and the illumination effect can be improved.

  Further, the arc tube 18 does not need to be bent into a complicated shape, and it is only necessary to form and connect three U-shaped bent bulbs 31 having substantially the same shape, so that the manufacturing cost can be reduced.

  Further, a plurality of U-shaped U-shaped bent valves 31 having an outer diameter of 8 to 11 mm are arranged in parallel, and the maximum width in the direction in which the U-shaped bent valves 31 are arranged in parallel is 32 to The arc tube 18 is 43 mm, the maximum outer diameter is in the range of 55 to 60 mm, the minimum gap between the top P of the arc tube 18 is A1, and the minimum gap between the maximum outer diameter portion and the arc tube 18 is When the minimum gap between the end portion and the arc tube 18 is A3, and the globe 17 is provided to cover the arc tube 18 so as to satisfy the relationship of A2> A1 ≧ A3, the light distribution in the base direction and the top direction increases. In addition, it is possible to define the optimum conditions for the light distribution characteristics similar to those for general lighting bulbs. If A1 is 2 to 8 mm, A2 is 3 to 13 mm, and A3 is 2 to 8 mm, the optimum conditions for the light distribution characteristics approximate to those for general lighting bulbs are defined.

  Further, since the partition plate 33, the arc tube 18 and the globe 17 are bonded to each other with an adhesive, the heat of the arc tube 18 is efficiently radiated through the globe 17, the structure can be simplified, and the manufacturing cost can be reduced.

  Further, since the U-shaped bent bulbs 31 of the arc tube 18 are arranged side by side in a triangular shape, the arc tube 18 can be arranged in a small size.

  Further, the interval w1 between the straight portions 31b of the U-shaped bent valve 31 and the interval w2 between the adjacent U-shaped bent valves 31 are substantially equal, and the interval w1 and the interval w2 are within the range of 1 to 5 mm. The arc tube 18 can be arranged in a small size.

  Further, since the lighting circuit 16 operates the N-channel field effect transistor Q1 and the P-channel field effect transistor Q2 by the control circuit 104, each of the lighting circuits 16 is controlled to a different state by the output of one control circuit 104, and the circuit configuration is changed. By using the lighting circuit 16 that can be simplified and has a small number of parts, downsizing of the bulb-type fluorescent lamp 10 is further promoted.

  In this way, an external shape approximating that of a general lighting bulb equivalent to a rated power of 60 W can be realized, so that it can be widely installed in lighting fixtures using a general lighting bulb, and versatility can be improved. There is no sense of incongruity of time, and the appearance can be improved.

  In the above embodiment, as shown in FIG. 3, the adhesive 37 is injected into the groove formed between the fitting step 35 and the cover 14, and the fitting edge 17a of the globe 17 is fixed. However, each member can be fixed by various methods.

  FIG. 12 is a partial cross-sectional view of a light bulb-type fluorescent lamp showing the second embodiment, FIG. 13 is a cross-sectional view of a part of the light bulb-type fluorescent lamp showing the third embodiment, and FIG. 3 is a perspective view of a part of a bulb-type fluorescent lamp.

  That is, as shown in FIG. 12, a groove 51 is formed along the outer periphery of the partition plate 33 that fixes the arc tube 18, and the fitting edge 17a of the globe 17 is fitted into the groove 51 and the silicon-based The glove 17 is fixed by injecting an adhesive 37 such as. Further, the cover 14 is provided with the engaging portion 53, the partition plate 33 is formed with the engagement receiving portion 54, and the partition plate 33 is inserted inside the cover 14, or the inside of the cover 14 is partitioned. By inserting 33 and rotating it in a predetermined direction, the engaging portion 53 and the engagement receiving portion 54 are engaged, and the partition plate 33 and the cover 14 are fixed.

  In the configuration shown in FIG. 12, since the globe 17 is fixed only to the partition plate 33, the globe 17 is fixed with the arc tube 18 and the lighting circuit 16 incorporated in the partition plate 33 and the cover 14 attached. Compared to the configuration, the member on the arc tube 18 side and the member on the lighting circuit 16 side can be easily separated and recovered. Further, in this configuration, the structure of the portion exposed to the outside is simplified, the appearance can be improved, and, for example, a configuration in which the globe 17 is not used can be dealt with.

  Further, as shown in FIGS. 13 and 14, the cover 14 is formed by forming a cut portion 57 or a groove portion in a portion close to the globe 17 and the arc tube 18 such as the fitting step portion 35 of the partition plate 33. The arc tube 18 can also be integrally bonded and fixed by an adhesive 37 such as a silicon-based adhesive that bonds the globe 17 and the partition plate 33. In this configuration, the manufacturing process and structure are simplified and the manufacturing cost is reduced as compared with the configuration in which the cover 14, the globe 17, and the partition plate 33 are bonded and the arc tube 18 is bonded and fixed to the partition plate 33 in a separate process. In addition, the arc tube 18 can be firmly fixed to the globe 17 side, and the heat of the arc tube 18 can be transmitted to the globe 17 via the adhesive 37 so that heat can be efficiently radiated through the globe 17. Therefore, the deterioration of the luminous flux can be suppressed, and the temperature rise of the lighting circuit 16 can be suppressed, so that the reliability of the circuit can be improved.

  In the above embodiment, the lighting circuit 16 has one circuit board 24 arranged horizontally, that is, perpendicular to the insertion direction of the base 12. However, a plurality of circuit boards 24 may be provided. Further, in addition to horizontal, it can also be arranged vertically, that is, parallel to the insertion direction of the base 12.

  FIG. 15 is a side view in which a part of a bulb-type fluorescent lamp showing the fourth embodiment is cut away.

  As shown in FIG. 15, in this embodiment, the first circuit board 61 and the second circuit board 62 are arranged horizontally in the vertical direction. The first circuit board 61 located on the upper side has the component 25 mounted on the upper surface, and the second circuit board 62 located on the lower side has the component 25 mounted on the lower surface. And the second circuit board 62 are arranged with their solder surfaces facing each other. The first circuit board 61 located on the base 12 side is provided with components 25 such as an electrolytic capacitor and a film capacitor that are relatively weak against heat, and the second circuit board 62 is relatively resistant to heat. Further, a large number of components 25 having a small height, for example, chip components for resistance or rectification are arranged. Furthermore, the first and second circuit boards 61 and 62 are electrically connected to each other by a jumper wire 65 made of a plurality of tin-plated wires such as two or three, or a flexible cable in the form of a film. When the first and second circuit boards 61 and 62 are assembled, the jumper wire 65 is bent and the solder surfaces of the two first and second circuit boards 61 and 62 are mounted to face each other. In addition, between the solder surfaces of the first and second circuit boards 61 and 62, a silicon film having an insulating property and a heat resistance and a good heat insulating property is about 1 mm thick. The insulating sheet 64 is disposed, the solder surfaces are insulated from each other, and heat is prevented from being transmitted from the arc tube 18 to the first circuit board 61.

  In the configuration shown in FIG. 15, the circuit components are divided into two substrates, thereby reducing the size of the lighting circuit 16 on the plane and reducing the size of the circuit mounting structure. A lamp shape equivalent to a commercial light bulb can be realized, and the heat-sensitive component 25 can be easily protected, improving reliability and mass productivity.

  In the configuration shown in FIG. 15, so-called silicon potting on which a silicon adhesive is placed is performed on a film capacitor that is weak against heat, a ballast choke that generates a lot of heat, and the like between the second circuit board 62 and the partition plate 33. A silicon-based resin rubber can be interposed in the air layer 68 in between. By using these silicon potting and resin rubber, heat dissipation of the component 25 is promoted, and heat from the arc tube 18 is not easily transmitted to the component 25, so that the temperature of the component 25 can be lowered.

  In the above embodiment, the end of the arc tube 18 is sealed with a line seal using a mount, but it is sealed with a pinch seal that does not use a mount, simplifying the mount manufacturing process and reducing the manufacturing cost. Can be reduced.

  FIG. 16 is a partial cross-sectional view of the arc tube showing the fifth embodiment, and FIG. 17 is a partial cross-sectional view of the arc tube showing the sixth embodiment.

  For example, as in the embodiment shown in FIG. 16, the end of the arc tube 18 can be sealed by pinching using a jig. At this time, since the filament coil 44 is clamped and supported by two wells 45 fixed to the bead glass (mount beat), the mount manufacturing process becomes complicated, and depending on the position and inclination of the bead glass, The fluorescent film applied to the inner surface of the arc tube 18 may be damaged, and the quality of the arc tube 18 may be deteriorated. In this embodiment, for the mounts used at both ends of the hot cathode fluorescent lamp, the filament coil 44 is directly clamped by the two wells 45, and the clamp width is set to 7 mm or less so that the bead glass is used. This eliminates the need for advanced management of the position and inclination required for the arc tube 18, simplifies the manufacturing process of the arc tube 18, reduces the manufacturing cost, and improves the quality of the arc tube 18. Also in this embodiment, the auxiliary amalgam 49 is provided in the wells 45 on one side.

  In addition, when sealing by pinching, the dumet wire 46 of the wells 45 has been pinched and sealed directly by the arc tube 18 in the past, so that the metal dumet wire 46 and the glass of the arc tube 18 are sufficient. It is difficult to set the heating conditions such as the time and temperature to be in close contact with each other, and advanced manufacturing technology is required. It is difficult to reduce the manufacturing cost, and if the sealing is defective, the quality of the arc tube 18 is deteriorated. Has a problem. Therefore, as shown in FIG. 17, in a state where glass is pre-welded to a jumet line (jumet part) 46 of a wells 45, the jumet line 46 is sealed with the arc tube 18 by pinching. The sealing performance can be easily improved, the quality of the arc tube 18 can be improved, the yield can be improved, and the manufacturing cost can be reduced. In the configuration shown in FIG. 17, bead glass that supports two wells 45 may be used.

  In the above-described embodiment, the bulb-type fluorescent lamp includes the globe 17 corresponding to the shape of a glass bulb of a general illumination bulb equivalent to a rated power of 60 W, but the shape of the globe 17 is the same as that of a general illumination bulb. Various shapes can be applied without being limited to the glass sphere, or the globe 17 may not be used.

  FIG. 18 is a side view in which a part of a light bulb shaped fluorescent lamp showing the seventh embodiment is cut out, and FIG. 19 is a side view in which a part of the light bulb shaped fluorescent lamp showing the eighth embodiment is cut out. is there.

  That is, in the embodiment shown in FIG. 18, the arc tube 18 is exposed from the cover 14 without using the globe 17. With this configuration, a further miniaturized light bulb-type fluorescent lamp can be realized, and the adaptability to a lighting fixture using a general lighting bulb can be further increased, and the total luminous flux can be improved.

  Further, in the embodiment shown in FIG. 19, by forming the globe 17 in a ball shape, it can be configured to approximate a ball-shaped glass bulb of a general lighting bulb.

  In each of the above embodiments, the glove 17 such as milky white is provided, but a transparent (clear type) glove may be provided.

  Then, the lighting fixture is configured by mounting the bulb-type fluorescent lamp 10 having the above-described configuration on a fixture body provided with a socket used for a general lighting bulb. And in this structure, while a brightness nonuniformity is reduced and a lighting effect improves, a manufacturing cost can be reduced, and the lighting fixture provided with said each effect can be comprised.

  In each of the above-described embodiments, the arc tube 18 is configured by connecting three U-shaped bent bulbs 31. However, the shape of the arc tube 18 is not limited to this, for example, a U-shape. Alternatively, two, three, or four H-shaped bent bulbs are juxtaposed, that is, a 4-axis, 6-axis, or 8-axis discharge path is formed along the longitudinal direction, and the lamp length Can be shortened.

It is the side view which saw through the glove of the bulb-type fluorescent lamp which shows the 1st embodiment of the present invention. It is the bottom view which saw through the glove of the bulb-type fluorescent lamp same as the above. It is sectional drawing of a part of a bulb-type fluorescent lamp same as the above. It is explanatory drawing which shows a lighting circuit and a luminous tube same as the above. It is a side view of a U-shaped bent valve same as the above. It is sectional drawing of a part of U-shaped bending-shaped valve | bulb same as the above. It is explanatory drawing which shows the connection state of a lighting circuit same as the above and an arc tube. It is a graph which shows the relationship between the tube outer diameter of a U-shaped bending | flexion shaped bulb same as the above, lamp efficiency, and the maximum width | variety of an arc tube. It is explanatory drawing which shows the arrangement | positioning relationship of a U-shaped bending valve | bulb same as the above. It is a light distribution diagram of a bulb-type fluorescent lamp. It is a circuit diagram of a lighting circuit same as the above. It is sectional drawing of a part of bulb-type fluorescent lamp which shows the 2nd Embodiment of this invention. It is sectional drawing of a part of bulb-type fluorescent lamp which shows the 3rd Embodiment of this invention. It is a perspective view of a part of the same bulb-type fluorescent lamp. It is the side view which notched a part of bulb-type fluorescent lamp which shows the 4th Embodiment of this invention. It is a partial cross section figure of the arc tube which shows the 5th Embodiment of this invention. It is a partial cross section figure of the arc tube which shows the 6th Embodiment of this invention. It is the side view which notched a part of bulb-type fluorescent lamp which shows the 7th Embodiment of this invention. It is the side view which notched a part of bulb-type fluorescent lamp which shows the 8th Embodiment of this invention.

Explanation of symbols

10 bulb-type fluorescent lamp, 12 base, 14 cover, 16 lighting circuit,
17 globe, 18 arc tube, 25, 26 parts, 31 U-shaped bent bulb,
31a bent part, 31b linear part, 33 partition plate as support member, 37 adhesive,
102 Inverter main circuit, 104 Control circuit as control means, P top,
Q1 Field effect transistor as N-channel transistor,
Q2 Field effect transistor as P-channel transistor,
L2 ballast choke, L3 secondary winding

Claims (3)

A cover having an upper base;
A partition plate having a disk-shaped substrate portion having a mounting hole and a cylindrical mounting piece projecting upward from the periphery of the substrate portion;
A substantially disk-shaped circuit board that is attached so as to be fitted to the attachment piece portion of the partition plate, a plurality of circuit components mounted on the circuit board, and a circuit-side wire led out above the circuit board A lighting circuit housed in the cover;
A glove attached to the cover in substantially the same shape as a general incandescent bulb;
The end portion is inserted and fixed in the mounting hole of the partition plate, and has a lamp side wire led out from the end portion, and is twisted together with the circuit side wire so that each tip is positioned on the base side with respect to the circuit board surface. An arc tube connected in a globe and housed in a globe;
Compact fluorescent lamp, characterized in that it comprises a.   The lighting circuit includes at least a pair of an N-channel transistor and a P-channel transistor connected in series to the input power supply, and a half-bridge inverter main circuit as a main switching element that generates a high-frequency voltage; A ballast choke for stably lighting the arc tube connected to the inverter main circuit, and a secondary winding common to the N-channel and P-channel transistors magnetically connected to the ballast choke. 2. The bulb-type fluorescent lamp according to claim 1, further comprising a control means for driving each transistor.   A lighting fixture comprising the bulb-type fluorescent lamp according to claim 1.

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