JP2004087502A - Compact self-ballasted fluorescent lamp and luminaire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact self-ballasted fluorescent lamp corresponding to a conventional lighting bulb. <P>SOLUTION: The fluorescent lamp comprises an arc bulb 18, a cover 14, a glow starter circuit 16, and a globe 17. A plurality of U-shaped bent bulbs 31 having an inner diameter of 6 to 9mm are juxtaposed to form the arc bulb 18 that has a bulb height of 50-60 mm, a discharge path of 200 to 300 mm, a lamp electric power of 7 to 15W, a luminous flux of not less than 700 lm, and a lamp efficiency of 60 lm/w or more. The cover 14 fixing the arc bulb 18 has a base 12. The height of the cover 14 including the base 12 is 110 to 125 mm. The glow starter circuit 16 is contained in the cover 14. The globe 17 has a shape formed similar to the standard dimension of the conventional lighting bulb. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to a compact fluorescent lamp and a lighting device.

2. Description of the Related Art Conventionally, for example, a bulb-type fluorescent lamp including a cover having a base that can be attached to a socket of a general lighting bulb, a lighting circuit accommodated inside the cover, and an arc tube bent and stored in a glove is known. Have been.

At present, the specifications of the main bulb-type fluorescent lamps on the market are that the height including the base is about 130 mm, the outer diameter is about 70 mm, the outer diameter of the arc tube 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, it is difficult to reduce the size of the fluorescent lamp in which such an arc tube is arranged to correspond to a general lighting bulb, and further downsizing is desired.

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

Further, in the fluorescent lamp described in Patent Literature 1, the arc tube is formed in a substantially U-shape with a corner bent at about 90 degrees. Has a problem that when the arc tube is housed in a small globe similar to a general lighting bulb, the corners are close to the globe, causing uneven brightness.

In addition, when the fluorescent lamp is miniaturized, there is a concern that the lighting circuit housed inside the cover may have a thermal influence from the arc tube. Therefore, for example, there is known a configuration in which a circuit board for mounting components of a lighting circuit is disposed at a position avoiding an electrode side end of an arc tube, such as a fluorescent lamp (for example, see Patent Document 3). However, as the size of the fluorescent lamp is reduced, the size of the circuit board is also reduced, so that there is a problem that a space for mounting components is reduced.
JP-A-62-12051 JP-A-8-273615

As described above, the conventional fluorescent lamp has a larger outer dimension than the general lighting bulb, and therefore cannot be applied to a lighting fixture using the general lighting bulb instead of the general lighting bulb. Have a problem.

The present invention has been made in view of the above points, and an object of the present invention is to provide a bulb-shaped fluorescent lamp and a lighting fixture corresponding to a general lighting bulb.

The light bulb-shaped fluorescent lamp according to claim 1, wherein the cover has a base; a lighting circuit accommodated in the cover; a glove which is attached to the cover in substantially the same shape as a general incandescent light bulb; A lamp-side wire derived from the arc tube is connected by being twisted with a circuit-side wire derived from the lighting circuit.

According to a second aspect of the present invention, there is provided the bulb-type fluorescent lamp according to any one of the first to third aspects, wherein the lighting circuit comprises an N-channel transistor and a P-channel connected in series to an input power supply. A half-bridge type inverter main circuit that has at least one pair of transistors and is a main switching element that generates a high-frequency voltage, a ballast choke for stably lighting an arc tube connected to the inverter main circuit, and a magnetic ballast choke A secondary winding common to the N-channel and P-channel transistors which are connected to each other, and control means for driving each transistor by the secondary winding.

(4) With this configuration, the N-channel transistor and the P-channel transistor are operated by the control means, so that the output of one control means controls each to a different state, thereby simplifying the circuit configuration. By using such a lighting circuit having a small number of components, downsizing of the bulb-type fluorescent lamp is further promoted.

照明 A lighting apparatus according to a third aspect is provided with the bulb-type fluorescent lamp according to the first or second aspect.

According to the bulb-type fluorescent lamp of the first aspect, a relatively large space can be occupied as compared with a configuration in which a lamp-side wire is connected to a column-shaped pin protruding from the circuit side derived from the lighting circuit. In addition, the size can be reduced, and there is no need for special parts.

According to the bulb-type fluorescent lamp of the second aspect, in addition to the effect of the bulb-type fluorescent lamp of the first aspect, the control means operates the N-channel transistor and the P-channel transistor. Outputs can be controlled to different states, the circuit configuration can be simplified, and by using such a lighting circuit with a small number of components, the miniaturization of the compact fluorescent lamp is further promoted.

According to the third aspect of the present invention, since the light bulb-shaped fluorescent lamp according to the first or second aspect is provided, a lighting apparatus using a general lighting bulb can be used.

Hereinafter, an embodiment of a compact fluorescent lamp and a lighting device according to the present invention will be described with reference to the drawings.

1 to 11 show a first embodiment, wherein FIG. 1 is a side view of a globe of a bulb-shaped fluorescent lamp seen through, FIG. 2 is a bottom view of a globe of a bulb-shaped fluorescent lamp 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 cross-sectional view of a part of a U-shaped bulb. , FIG. 7 is an explanatory diagram showing a connection state between 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 an explanatory diagram showing an arrangement relationship of the V-shaped bulb, 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-shaped fluorescent lamp. The bulb-shaped fluorescent lamp 10 has a cover 14 having a base 12, a lighting circuit 16 housed in the cover 14, and a light-transmitting property. 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 to have an outer shape that is close to the standard dimensions of a general lighting bulb such as an incandescent bulb with a rated power of 60 W. 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 C7501. Hereinafter, the description will be made with the base 12 side being the upper side and the glove 17 side being the lower side.

The cover 14 has a cover body 21 made 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 a base 12 such as an E26 type is put on an upper end portion thereof, and is fixed with an adhesive or a caulking.

The globe 17 is transparent or milky white having a light diffusing property, 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. At the edge of the opening, a fitting edge 17a that fits inside the opening at the lower end of the cover 14 is formed. The globe 17 can be combined with another member such as a diffusion film to improve the uniformity of luminance.

The lighting circuit 16 housed in the cover 14 has a disk-shaped circuit board 24 arranged horizontally, that is, perpendicular to the longitudinal direction of the arc tube 18, as shown in FIGS. A plurality of components (electric components) 25 and 26 are mounted on both surfaces of the circuit board 24, that is, on the upper surface on the base 12 side and on the lower surface on the arc tube 18 side, and perform an inverter circuit (high-frequency lighting circuit) for high-frequency lighting. ) Is configured.

Of the plurality of components 25 and 26, components 25 such as electrolytic capacitors and film capacitors having relatively low heat resistance are mounted on the upper surface of the circuit board 24, and relatively low heat resistance is mounted on the lower surface of the circuit board 24. At the same time, there are mounted components 26 such as chip-shaped RECs (rectifiers, rectifiers, diode bridges), transistors, resistors, etc., each having a small thickness and a thickness of about 2 to 3 mm.

The circuit board 24 has a substantially disk shape and a diameter (maximum width dimension) of 1.2 times or less the maximum width D3 in the direction in which the U-shaped bent valves 31 are juxtaposed. From the circuit board 24, two pairs, that is, four circuit-side wires 28 serving as output units are led out. Note that a wrapping pin may be implanted on the circuit board 24 instead of the circuit-side wire 28.

Also, as shown in FIGS. 1 to 6, the arc tube 18 housed in the globe 17 has three U-shaped bent bulbs 31 of substantially the same shape arranged at predetermined positions, and sequentially communicates with the communication tube 32. The connection forms one discharge path.

{Circle around (1)} Each U-shaped bent bulb 31 has a phosphor film formed on the inner surface and a rare gas such as argon and mercury sealed inside. 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 having a length of about 110 to 130 mm is smoothly curved at an intermediate portion, and is formed in a substantially U shape having a top portion P. That is, each U-shaped bent valve 31 has a bent portion 31a that smoothly reverses, 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 of 32 to 43 mm in the bulb side-by-side direction.

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 is provided with a disk-shaped substrate portion 34, and the end of each U-shaped bent valve 31 is inserted into a mounting hole 34a formed in the substrate portion 34, and is then bonded with an adhesive. The arc tube 18 is fixed to the partition plate 33 by bonding or the like. Further, a fitting step portion 35 is formed from the outer peripheral portion of the substrate portion 34 toward the upper side and further outward. The fitting step 35 is fitted inside the cover 14, and the fitting edge 17 a of the glove 17 is fitted between the fitting step 35 and the cover 14. By filling an adhesive 37 between the step portion 35 and the cover 14, these members are fixed to each other. A mounting piece 38 having a cylindrical shape or the like is protruded above the fitting step 35, and the circuit board 24 of the lighting circuit 16 is mounted on the mounting piece 38 by fitting or bonding. Have been.

In addition, the arc tube 18 is housed at a predetermined position in the globe 17 with the bulb-type fluorescent lamp 10 assembled as described above. That is, in this state, the tops P of the respective U-shaped bent bulbs 31 are positioned at equal intervals on one circumference centered on a central axis whose longitudinal direction is the vertical direction of the bulb-shaped fluorescent lamp 10. The straight portions 31b of each of the U-shaped bent bulbs 31 are also arranged 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 axes of the straight portions 31b of the three U-shaped bent bulbs 31 of the arc tube 18 are located substantially at the apex P of a regular hexagon. 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 w (w1, w2) is defined within the range of 1 to 5 mm. ing. Although the interval w (w1, w2) is in the range of 1 to 5 mm, it is preferably 2 to 3 mm from the viewpoint of manufacture, 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 in which 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. .

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

The outer diameter of the globe 17 must be 45 mm or less (preferably about 40 mm) in order to approximate the appearance of the general lighting bulb and to increase the adaptability to lighting equipment using the general lighting bulb. In consideration of 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.

下限 The lower limit of the tube outer diameter d1 was set to 8 mm so that the relative lamp efficiency became 97% or more.

上限 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 vertices of a 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. And

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 equation 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 pipe is set to 6 mm is that when the diameter is 6 mm or less, the starting voltage becomes high and the pipe is not practical.

Further, when the wall thickness is 1.1 mm or more, a glass wall is formed 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 accumulation of glass in the inside of 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 portion 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 A1. When A3, A2> A1≥A3 is defined. 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-shaped fluorescent lamp 10 having the relationship of A2> A1≥A3 and the light distribution S2 of the conventional bulb-shaped fluorescent lamp having the relationship of A2 = A3 having a cylindrical envelope. And The 0 ° direction corresponds to the top direction of the arc tube 18, the 180 ° direction corresponds to the cap 12 direction, and the 90 ° direction corresponds to the side direction of the arc tube 18.

The light distribution S1 in the case of A2> A1 ≧ A3 is larger than the light distribution S2 in the case of A2 = A3, and is closer to the light distribution of a general lighting bulb compared to the light distribution S2 in the case of A2 = A3. 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 base 12 direction increases. Moreover, by setting A1 to satisfy the relationship of A2> A1≥A3, that is, the relationship of 2 mm> A1> 8 mm, the light distribution toward the top of the arc tube 18 can be enhanced. Therefore, by defining the relationship of A2> A1 ≧ A3 of the bulb-type fluorescent lamp 10, it is possible to define the optimum condition of the light distribution characteristics similar to the general lighting bulb.

When the bulb-shaped fluorescent lamp 10 defined as described above is used for a lighting device of a general lighting bulb, the light distribution of the bulb-shaped fluorescent lamp 10 approximates the light distribution of a general lighting bulb, so that the inside of the lighting device is improved. The amount of light applied to the reflector in the vicinity of the socket provided in the reflector is sufficiently ensured, and the device characteristics according to the optical design of the reflector can be obtained. Moreover, even in the case of a lighting fixture in which the image of the internal light source is projected on a light diffusing cover made of cloth or the like, such as a light bulb stand, the light distribution of the bulb-type fluorescent lamp 10 should be similar to the light distribution of a general lighting bulb. It can be used without discomfort.

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

On the other hand, each U-shaped bent valve 31 has one end sealed by a line seal using a mount or a pinch seal without using a mount, and a thin tube 41 also called an exhaust pipe at the other end. Are welded and exhausted, or provided with amalgam 42 as needed. A filament coil 44 is supported by a pair of wells (introduction lines) 45 at the ends of the U-shaped bent bulbs 31 located at both ends of the arc tube 18 by a line seal using a mount or the like. Is arranged. Then, each well 45 is connected to a lamp-side wire 48 led out of the U-shaped bent bulb 31 via a dumet wire 46 sealed to glass at the end of the U-shaped bent bulb 31. Have been. The one wells 45 is provided with an auxiliary amalgam 49 as necessary.

The two pairs of lamp wires 48 led out of the arc tube 18 are twisted with the circuit wires 28 led out of the lighting circuit 16 as shown in FIG. 3, FIG. 4 and FIG. They are mated and electrically and mechanically connected. The wires 28 and 48 are inserted and guided in grooves formed in the rib-shaped mounting piece 38 of the partition plate 33. Therefore, compared to a configuration in which a connector is provided in the lighting circuit 16 to insert and connect the lamp-side wire 48 or a configuration in which the lamp-side wire 48 is wound around and connected to a columnar pin protruding from the lighting circuit 16, a large space is occupied. In addition, the size can be reduced, and there is no need for special parts. At this time, if the diameter of the circuit-side wire 28 and the diameter of the lamp-side wire 48 are significantly different from each other, it becomes difficult to perform the twisting operation. Therefore, the relationship between the diameter D28 of the circuit-side wire 28 and the diameter D48 of the lamp-side wire 48 is set to (0.9 × D28) <D48 <(1.1 × D28), so that it is easy and reliable. Can be connected by twisting. Further, by setting the number of twists to three or more, electrical and mechanical connection can be ensured. Note that, for example, a columnar portion may be protruded upward from the partition plate 33, and a torsion connection may be made around the portions of the wires 28 and 48.

Further, as for the thin tube 41 for exhausting each U-shaped bent valve 31, if the inner diameter d3 of the tube is smaller than the 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 thin tube 41 becomes large, the wells 45 to be sealed at the same time as the thin tube 41 cannot secure a gap with the outer surface of the thin tube 41 or the inner surface of the U-shaped bent valve 31, and a sealing failure may occur. For example, the quality of the arc tube 18 may be deteriorated. In particular, conventionally, the inner diameter of the U-shaped bent valve is at least three times the 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 low. It was difficult to improve. In this regard, in this embodiment, the inner diameter d3 of the thin tube 41 is set to be within the range of 2.0 <(d2 / d3) <2.8 with respect to the inner diameter d2 of the U-shaped bent valve 31. As a result, the exhaust efficiency can be improved by increasing the inner diameter d3 of the thin tube 41, the sealing performance can be ensured, and the quality of the arc tube 18 can be improved. Note that the exhaust efficiency can be improved by providing the thin tube 41 serving as an exhaust tube at an intermediate portion in the longitudinal direction of the arc tube 18.

The bulb-shaped fluorescent lamp 10 thus configured has an input power rating of 14 W, and is applied to the arc tube 18 at a high frequency of 12.5 W, the lamp current is 280 mA, the lamp voltage is 65 V, and the three-wavelength lamp is used. The total luminous flux is 810 lm by using 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 supply e via a fuse F1, and an input terminal of a full-wave rectifier 101 is connected to the capacitor C1 via an inductor L1 constituting a filter. ing. The output terminal of the full-wave rectifier 101 is connected to a smoothing capacitor C2 via a resistor R1, and a half-bridge type inverter main circuit 102 is connected to the capacitor C2.

The inverter main circuit 102 is connected in series with a capacitor C2 in parallel with a field-effect transistor Q1 as a MOS-type N-channel transistor and a field-effect transistor Q2 as a MOS-type P-channel transistor that are switching elements. Have been. The sources of the N-channel field-effect transistor Q1 and the P-channel field-effect transistor Q2 are connected to each other.

One end of each of the filament coils 44, 44 at both ends of the arc tube 18 is connected between the drain and the source of the field effect transistor Q2 via a ballast choke L2 (which also serves as a resonance function in this 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 a starting circuit 103 is connected between a 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. A series circuit of capacitors C5 and C6 is connected between the gate of the field-effect transistor Q2 and the sources of the field-effect transistors Q1 and Q2, and these capacitors C5 and the capacitor C6 of the control circuit 104 as control means are connected. Are connected in parallel with 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. Further, a secondary winding L3 is magnetically coupled to the ballast choke L2, and a resonance circuit 106 including an inductor L4 and a capacitor C6 is connected to the secondary winding L3. Further, a resistor R3 of the starting circuit 103 is connected in parallel with the series circuit of the capacitor C5 and the inductor L4.

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

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

(4) When the power is turned on to the lighting circuit 16, the voltage of the commercial AC power supply 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 turns 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. Then, 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 generate a voltage that turns on the field effect transistor Q1 and turns off the field effect transistor Q2 by natural resonance. . Next, when the resonance voltage of the ballast choke L2 and the capacitor C4 is reversed, 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. Occurs. Further, when the resonance voltages of the ballast choke L2 and the capacitor C4 are inverted, the field effect transistor Q1 turns on and the field effect transistor Q2 turns 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 one filament coil 44 is preheated. A voltage is applied to start and light up.

(4) The Zener diode ZD1 and the Zener diode ZD2 stabilize the gate voltages of the field effect transistors Q1 and Q2 and protect the gates from excessive voltages.

Therefore, 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. Q1 and Q2 can be controlled. Also, since the resonance 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 to reduce the size. Of the output voltage can be reduced. That is, when the output voltage of the secondary winding L3 is simply output without providing the resonance circuit of the inductor L4 and the capacitor C6, although it depends on the relationship between the starting voltage of the arc tube 18 and the lamp voltage, The output voltage of the secondary winding L3 has a difference of about 10 times or more between no load and load, and it is difficult to stabilize and protect the gate voltage with a Zener diode, or an expensive Zener diode is required. Sometimes.

According to the present embodiment, a plurality of U-shaped bent valves 31 having a tube inner diameter of 6 to 9 mm are juxtaposed to have a height H2 of 50 to 60 mm and a discharge path length of 200 to 60 mm. A height H1 of a cover 14 including a base 12 to which the luminous tube 18 is attached, the luminous tube 18 having a size of 300 mm and a total luminous flux when lit at a lamp power of 7 to 15 W is 700 lm or more. Is set to 110 to 125 mm, it is possible to define the dimensions of the general lighting bulb equivalent to the rated power of 60 W type and the optimum conditions of each configuration to correspond to the total luminous flux. The lower limit of the inner diameter of the tube is set to 6 mm because the starting voltage becomes high when the inner diameter is 6 mm or less, which is not practical.

Further, the arc tube 18 having a plurality of U-shaped bent bulbs 31 having a tube outer diameter of 8 to 11 mm, a wall thickness of 0.7 to 1.0 mm, and a top P having a curved shape is arranged in parallel. Since it is provided, it is possible to define the dimensions 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 make the inner diameter of the tube larger with the outer diameter of the tube and the thickness conditions that can secure the strength. Can be specified. When the wall thickness is 1.1 mm or more, the inner diameter of the pipe is relatively small with respect to the outer diameter of the pipe, so that the inner surface area of the pipe cannot be increased, and the wall of glass inside the bent portion 31a bent in a U-shape. , And cracks are easily generated from the inside of the bent portion 31a. However, by setting the thickness to 0.7 to 1.0 mm, it is possible to suppress the occurrence of glass accumulation inside the bent portion 31a.

Further, the circuit board 24 has a maximum width of 1.2 times or less the maximum width of the arc tube 18 in the direction in which the U-shaped bent bulbs 31 are juxtaposed, and the circuit board 24 on the side facing the arc tube 18 A relatively high heat-resistant component 26 is mounted on the surface and a relatively low heat-resistant component 25 is mounted on the opposite surface, so that the thermal effects of the components 25 and 26 mounted on the circuit board 24 are suppressed. The circuit board 24 can be downsized, and the portion of the cover 14 that houses 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 to suppress the thermal effect on the component 26 due to heat generated from the electrode. it can. In addition, the circuit board 24 is preferably circular in shape because a mounting space can be efficiently secured, but may be polygonal such as a square or elliptical.

The arc tube 18 has three or more U-shaped bent bulbs 31 which are provided with smoothly curved tops P and are sequentially connected, and each top P is arranged on the same circumference facing the inner surface of the globe 17. Since the respective U-shaped bent bulbs 31 are arranged with an interval equal to or less than the outer diameter of each other, the arc tube 18 can be housed in the globe 17 miniaturized to have substantially the same shape as a general lighting bulb. In addition, even when the arc tube 18 is stored in such a miniaturized globe 17, luminance unevenness can be reduced and the lighting effect can be improved.

The arc tube 18 does not need to be bent into a complicated shape, and it is sufficient 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 bent valves 31 having a tube outer diameter of 8 to 11 mm are juxtaposed, and the maximum width in the direction in which the U-shaped bent valves 31 are juxtaposed is 32 to The arc tube 18 having a diameter of 43 mm and a maximum outer diameter in the range of 55 to 60 mm, a minimum gap between the top P of the arc tube 18 and the minimum gap between the maximum outer diameter portion and the arc tube 18 A2, when the minimum gap between the end portion and the arc tube 18 is A3, since the globe 17 covering the arc tube 18 is provided so as to satisfy the relationship of A2> A1 ≧ A3, the light distribution in the direction of the base and the top is increased. In addition, it is possible to define the optimum condition of the light distribution characteristics similar to the general lighting bulb. If A1 is 2 to 8 mm, A2 is 3 to 13 mm, and A3 is 2 to 8 mm, the optimum condition of the light distribution characteristics similar to a general lighting bulb is 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 can be efficiently radiated through the globe 17, and 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 cross section, the arc tube 18 can be arranged in a small size.

Further, since 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, 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, so that the output of one control circuit 104 controls each of them to a different state, and the circuit configuration is changed. By using the lighting circuit 16 which can be simplified and has such a small number of parts, the miniaturization of the compact fluorescent lamp 10 is further promoted.

In this way, since an external shape similar to a general lighting bulb equivalent to a rated power of 60 W can be realized, it can be widely mounted on lighting fixtures using the general lighting bulb, and versatility can be improved and mounting can be improved. The sense of discomfort at the time is also eliminated, 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 cross-sectional view of a part of a compact fluorescent lamp according to a second embodiment, FIG. 13 is a partial cross-sectional view of a compact fluorescent lamp according to a 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 portion 51 is formed along the outer peripheral portion of the partition plate 33 for fixing the arc tube 18, and the fitting edge portion 17a of the globe 17 is fitted into the groove portion 51 and the silicon-based material is formed. The glove 17 is fixed by injecting an adhesive 37 such as an adhesive. Further, the cover 14 is provided with the engaging portion 53, the partition plate 33 is formed with the engaging receiving portion 54, and the partition plate 33 is inserted inside the cover 14 or the partition plate is formed inside the cover 14. By inserting and rotating in a predetermined direction, the engagement 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 in a state where the arc tube 18 and the lighting circuit 16 are incorporated in the partition plate 33 and the cover 14 is attached. As compared with the configuration, the member on the arc tube 18 side and the member on the lighting circuit 16 side can be easily separated and collected. 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 without using the globe 17 can be supported.

Further, as shown in FIGS. 13 and 14, a notch 57 or a groove is formed in a portion close to the globe 17 and the arc tube 18, such as the fitting step 35 of the partition plate 33, so that the cover 14 The arc tube 18 can be further bonded and fixed integrally with an adhesive 37 such as a silicon-based material for bonding 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 a 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 step. 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, and the heat can be efficiently radiated through the globe 17. Thus, the deterioration of the luminous flux can be suppressed, and the rise in the temperature of the lighting circuit 16 can be suppressed, so that the reliability of the circuit can be improved.

Further, in the above-described embodiment, the lighting circuit 16 arranges one circuit board 24 horizontally, that is, perpendicularly to the insertion direction of the base 12, but a plurality of circuit boards 24 may be provided. In addition to being horizontal, they can be arranged vertically, that is, in parallel with the direction in which the base 12 is inserted.

FIG. 15 is a side view in which a part of a bulb-shaped fluorescent lamp according to a fourth embodiment is cut away.

In this embodiment, as shown in FIG. 15, a first circuit board 61 and a second circuit board 62 are vertically arranged horizontally. 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. Then, components 25 such as an electrolytic capacitor and a film capacitor which are relatively weak to heat are arranged on the first circuit board 61 located on the base 12 side, and the second circuit board 62 is relatively strong against heat, In addition, many components 25 having small height dimensions, for example, chip components for resistance or rectification are arranged. Further, 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 electric 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 so that the solder surfaces of the two first and second circuit boards 61 and 62 face each other. In addition, between the solder surfaces of the first and second circuit boards 61 and 62, a silicon-based film having insulation and heat resistance and good heat insulation and having a thickness of about 1 mm is provided. The insulating sheet 64 is provided, so that the solder surfaces are insulated from each other, and the conduction of heat from the arc tube 18 to the first circuit board 61 is suppressed.

In the configuration shown in FIG. 15, by dividing the circuit components into two substrates, the dimensions of the lighting circuit 16 on the plane are reduced, and the size of the circuit mounting structure is reduced. A lamp shape equivalent to an electric bulb can be realized, and the heat-sensitive component 25 can be easily protected, so that reliability and mass productivity can be improved.

In the configuration shown in FIG. 15, for a film capacitor weak to heat, a ballast choke that generates a large amount of heat, etc., so-called silicon potting on which a silicone adhesive is placed is performed. A silicon-based resin rubber can also be interposed in the air layer 68 therebetween. By using the silicon potting and the resin rubber, the heat radiation of the component 25 is promoted, and the heat from the arc tube 18 is not easily transmitted to the component 25, so that the temperature of the component 25 can be reduced.

In the above-described embodiment, the end of the arc tube 18 is sealed with a line seal using a mount, but is sealed with a pinch seal without using a mount, which simplifies the mount manufacturing process and reduces manufacturing costs. Can be reduced.

FIG. 16 is a cross-sectional view of a part of the arc tube according to the fifth embodiment, and FIG. 17 is a cross-sectional view of a part of the arc tube according to 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, conventionally, since the filament coil 44 is clamped and supported by two wells 45 fixed to the bead glass (mount beat), the mounting manufacturing process becomes complicated, and depending on the position and inclination of the bead glass. There is a possibility that 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 the present 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 sophisticated management of the position and inclination required for the luminous vessel, simplifies the production process of the luminous bulb 18, reduces the production cost, and improves the quality of the luminous bulb 18. In this embodiment, an auxiliary amalgam 49 is provided on one side of the wells 45 as well.

Further, in the case of sealing by pinching, conventionally, the dumet wire 46 of the wells 45 was directly pinched and sealed with the arc tube 18, so that the jumet wire 46 made of metal and the glass of the arc tube 18 were sufficiently sealed. It is difficult to set heating conditions such as time and temperature to adhere to the surface, and it is necessary to use advanced manufacturing technology, and it is difficult to reduce the manufacturing cost, and if the sealing fails, the quality of the arc tube 18 deteriorates. Has problems. Therefore, as shown in FIG. 17, the glass is welded in advance to the dumet wire (dumet portion) 46 of the wells 45, and this dumet wire 46 is sealed to the arc tube 18 by pinching to thereby form the arc tube 18. Of the arc tube 18 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, a bead glass supporting two wells 45 can be used.

In the above embodiment, the bulb-type fluorescent lamp has the globe 17 corresponding to the shape of a glass bulb of a general lighting bulb equivalent to a rated power of 60 W. However, the shape of the globe 17 is the same as that of the general lighting bulb. The shape is not limited to the glass sphere, and various shapes can be applied, or the globe 17 need not be used.

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

That is, in the embodiment shown in FIG. 18, the globe 17 is not used, and the arc tube 18 is arranged so as to be exposed from the cover 14. With this configuration, a more compact 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 into a ball shape, the globe 17 can be configured to have a shape approximating a ball-shaped glass ball of a general lighting bulb.

Further, in each of the above embodiments, the glove 17 of milky white or the like 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 of each configuration described above on a fixture main body having a socket used for a general lighting bulb. With this configuration, it is possible to configure a lighting fixture having each of the above-described effects, such as reduced luminance unevenness, improved lighting effects, and reduced manufacturing costs.

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

It is the side view which saw through the globe of the electric bulb type fluorescent lamp showing a 1st embodiment of the present invention. It is the bottom view which saw through the globe of the same light bulb shaped fluorescent lamp. FIG. 2 is a cross-sectional view of a part of the light bulb-type fluorescent lamp. It is explanatory drawing which shows a lighting circuit and an arc tube same as the above. It is a side view of a U-shaped bent valve same as the above. FIG. 3 is a cross-sectional view of a part of the U-shaped bent valve. It is explanatory drawing which shows the connection state of a lighting circuit and an arc tube same as the above. 3 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. It is explanatory drawing which shows arrangement | positioning relationship of a U-shaped bent valve same as the above. FIG. 3 is a light distribution diagram of the above-described light bulb-type fluorescent lamp. It is a circuit diagram of a lighting circuit same as the above. FIG. 6 is a partial cross-sectional view of a light bulb-shaped fluorescent lamp according to a second embodiment of the present invention. FIG. 9 is a partial cross-sectional view of a light bulb shaped fluorescent lamp according to a third embodiment of the present invention. FIG. 2 is a perspective view of a part of the light bulb-type fluorescent lamp. It is the side view which notched some electric bulb type fluorescent lamps which show 4th Embodiment of this invention. FIG. 11 is a partial cross-sectional view of an arc tube showing a fifth embodiment of the present invention. It is a sectional view of a part of an arc tube showing a 6th embodiment of the present invention. It is the side view which notched some electric bulb type fluorescent lamps showing a 7th embodiment of the present invention. FIG. 16 is a side view of a light bulb shaped fluorescent lamp according to an eighth embodiment of the present invention, with a portion cut away.

Explanation of reference numerals

10 bulb-type fluorescent lamp, 12 bases, 14 cover, 16 lighting circuit,
17 globe, 18 arc tube, 25, 26 parts, 31 U-shaped bent valve,
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 a base;
A lighting circuit housed in the cover;
A glove attached to the cover in substantially the same shape as a general incandescent light bulb;
An arc tube housed in a glove;
And a lamp-side wire derived from the arc tube is connected by being twisted and connected to a circuit-side wire derived from a lighting circuit. A lighting circuit, a half-bridge type inverter main circuit having at least one pair of an N-channel transistor and a P-channel transistor connected in series to an input power supply and serving 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 secondary winding common to N-channel and P-channel transistors magnetically connected to the ballast choke; 2. The light bulb-shaped fluorescent lamp according to claim 1, further comprising control means for driving each of the transistors. A lighting fixture comprising the bulb-type fluorescent lamp according to claim 1.

Images