JP3262167B2 - Compact fluorescent lamps and lighting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, for example, a light bulb provided with a cover which can be attached to a socket of a general lighting bulb, a lighting circuit is stored inside the cover, and a light emitting tube is bent and stored in a glove. Shaped fluorescent lamps are known.

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, and 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 a fluorescent lamp having such an arc tube so as to correspond to a general lighting bulb, and further reduction in size is desired.

On the other hand, for example, as described in Japanese Patent Application Laid-Open No. Sho 62-12051, a fluorescent lamp having three U-shaped bent bulbs arranged so as to be substantially on each side of an equilateral triangle. Lamps are known. However, in this fluorescent lamp, the size and shape of the arc tube and the lighting conditions of the arc tube have not been studied in detail, so that an optimal configuration for miniaturization has not been realized.

In the fluorescent lamp described in Japanese Patent Application Laid-Open No. 62-12051, the arc tube is formed in a substantially U-shape with a corner bent at about 90 degrees.
As described above, in the configuration in which the arc tube is provided with corners, when the arc tube is housed in a small globe similar to a general lighting bulb, the corners are close to the globe, which causes problems such as uneven brightness. Have.

[0006] For example, a fluorescent lamp described in JP-A-9-69309 is known. In this fluorescent lamp, the arc tube is bent into a spiral shape or the like, and the same shape and size as those of a general lighting bulb are realized. However, such a configuration in which the arc tube is bent into a complicated shape such as a spiral has a problem that the manufacturing process is complicated and it is difficult to reduce the manufacturing cost. Therefore, adoption of such an arc tube is substantially difficult, and an arc tube having a U-shaped bent bulb is generally adopted.
The miniaturization of the fluorescent lamp has various restrictions on the shape and dimensions of the U-shaped bent bulb, and therefore, there is also difficulty in realizing it.

[0007] Further, 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. Then, for example, Japanese Patent Application Laid-Open No. 8-27361
There is known a configuration in which a circuit board on which components of a lighting circuit are mounted is located at a position avoiding an electrode side end of an arc tube, as in a fluorescent lamp described in Japanese Patent Application Laid-Open Publication No. 5 (1993) -205. 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.

[0008]

As described above, a conventional fluorescent lamp has a larger outer dimension than a general lighting bulb, and is therefore replaced with a general lighting bulb. There is a problem that it cannot be applied to the lighting equipment used.

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

[0010]

Means for Solving the Problems] self-ballasted fluorescent lamp according to claim 1, wherein the linear portions a plurality of U-shaped bent-shaped valve tube outer diameter having a linear portion and a bent portion a 8~11mm
The straight line of each U-shaped bent valve arranged along the circumference
Between the interval w1 of the section and the interval w2 of the adjacent U-shaped bent valve
Are approximately equal, and the distances w1 and w2 are in the range of 1 to 5 mm.
One discharge path is formed by the communication pipe when it is in the enclosure
So that the straight parts of the U-shaped bent valve are connected
And the maximum width in the valve side-by- side direction is 32 to 43 mm
Configured so that the light emitting tube; total end of the linear portion of the arc tube
It has a mounting hole into which the part is inserted.
The arc tube is installed with all the ends of the wire inserted.
Dimension to all ends of the linear portion of the arc tube are opposed; partition plate and that
Together it is attached to the partition plate provided with a single round <br/> circuit board having a maximum width dimension of 1.2 times the maximum width of the valve arrangement direction, the arc tube opposite to the side of the circuit board so that relatively a lighting circuit relatively low heat resistance parts are accommodated is mounted in the cover surface on the opposite with a highly heat-resistant chip-like components are mounted on a surface; cover the lighting circuit
A cover for fixing the partition plate and having a base;
Is provided.

In this configuration, the outer diameter of the pipe is 8 to 11 mm.
The number of U-shaped bent valves is equal to the straight line of each U-shaped bent valve.
Between the interval w1 of the section and the interval w2 of the adjacent U-shaped bent valve
Are approximately equal, and the distances w1 and w2 are in the range of 1 to 5 mm.
Within the enclosure, the maximum width in the valve juxtaposition direction is 32 to 43 mm.
And the maximum width of the circuit board
Keep the dimensions no more than 1.2 times the maximum width in the direction
One, because the implementation of the relatively low heat resistance parts on the surface of the opposite with mounting the light emitting tube side facing the relatively high heat resistance chip-like parts on the surface of the circuit board, the shorter the arc tube
Formulated is miniaturized circuit board while suppressing the thermal influence of the components mounted on the circuit board with allows, it enables miniaturization in dimensions corresponding to General lighting bulb. The circuit board preferably has a circular shape because a mounting space can be efficiently secured, but may have a polygonal shape such as a square shape or an elliptical shape.

According to a second aspect of the present invention, there is provided a bulb-type fluorescent lamp according to the first aspect, wherein the chip-shaped parts having relatively high heat resistance are rectifying elements and transistors, and the parts having relatively low heat resistance. Is an electrolytic capacitor.

In this configuration, since the chip-shaped components having relatively high heat resistance are rectifying elements and transistors, and the components having relatively low heat resistance are electrolytic capacitors, the thermal influence from the arc tube can be suppressed.

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

According to this configuration, the N-channel transistor and the P-channel transistor are operated by the control means, so that the respective outputs are controlled to be in different states by one control means, thereby simplifying the circuit configuration. By using such a lighting circuit having a small number of components, downsizing of the compact fluorescent lamp is further promoted.

According to a fourth aspect of the present invention, there is provided a lighting apparatus including the light bulb-shaped fluorescent lamp according to any one of the first to third aspects.

With this configuration, it is possible to use a lighting fixture using a general lighting bulb.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a compact fluorescent lamp and a lighting device according to the present invention.

FIGS. 1 to 11 show a first embodiment. FIG. 1 is a side view of a globe of a bulb-type 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 a sectional view of a part of a bulb-type fluorescent lamp, 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. FIG. 7 is an explanatory diagram showing a connection state between the lighting circuit and the arc tube,
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, FIG. 9 is an explanatory diagram showing the arrangement relationship of the U-shaped bent bulb, and FIG. And FIG. 11 is a circuit diagram of a lighting circuit.

1 to 3, reference numeral 10 denotes a bulb-shaped fluorescent lamp.
, A lighting circuit 16 housed in the cover 14, a translucent glove 17, and a glove 17
And a luminous tube 18 housed therein. The envelope composed of the glove 17 and the cover 14 has a rated power of 6
It is formed in an outer shape that is close to the standard dimensions of a general lighting bulb such as an incandescent bulb equivalent to a 0 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,
Is formed to have a size of about 40 mm. The general lighting bulb is defined in JIS C7501. In the following, the base 12 side is the upper side, the glove 17
The description will be made with the 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 body 21 has a substantially cylindrical shape that expands downward, and has
A base 12 such as an E26 type is covered and fixed with an adhesive or a caulking.

The globe 17 is transparent or milky white having light diffusivity, 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. 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 the uniformity of luminance.

The lighting circuit 16 housed in the cover 14
As shown in FIG. 1, FIG. 3 and FIG. 4, a circuit board 24 is provided in a horizontal shape, that is, a disc shape arranged perpendicular to the longitudinal direction of the arc tube 18.
A plurality of components (electric components) 25 and 26 are mounted on the upper surface on the side and the lower surface on the side of the arc tube 18 to constitute an inverter circuit (high-frequency lighting circuit) that performs high-frequency lighting.

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. A component 26, such as a chip-shaped REC (rectifier, rectifying element, diode bridge), a transistor, a resistor, and the like, having a small thickness and a thickness of about 2 to 3 mm is mounted. .

The circuit board 24 is substantially disk-shaped and has 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. The circuit side wire
Instead of 28, a wrapping pin may be implanted on the circuit board 24.

An arc tube 18 housed in a globe 17
As shown in FIG. 1 to FIG. 6, three U-shaped
The V-shaped bent bulb 31 is arranged at a predetermined position, and is sequentially connected by a communication pipe 32 to form one discharge path.

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 of the U-shaped bent valves 31 is a glass cylindrical valve having a pipe outer diameter d1 of 8 to 11 mm, a pipe inner diameter d2 of 6 to 9 mm, and a wall thickness of 0.7 to 1.0 mm. Approximately U having a top P by bending a valve of about 110 to 130 mm smoothly in the middle.
It is formed in a character shape. That is, each U-shaped bent valve 31 includes a bent portion 31a that smoothly reverses and a bent portion 31a.
And a pair of parallel linear portions 31b that are continuous with each other. The arc tube 18 has a bulb height H2 of 50-6.
0 mm, the discharge path length is 200 to 300 mm, and the maximum width D3 in the bulb side-by-side direction is 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 a mounting hole 34a formed in the substrate portion 34.
The arc tube 18 is fixed to the partition plate 33 by inserting the end of each of the U-shaped bent bulbs 31 and bonding it with an adhesive. In addition, a fitting step portion 35 is formed from the outer peripheral portion of the substrate portion 34 toward the upper side and further outward. Then, the fitting step 35 is fitted inside the cover 14, and further, the fitting edge 17a 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. Also, on the upper side of the fitting step 35,
A mounting piece 38 having a cylindrical shape or the like is protrudingly provided.
The circuit board 24 of the lighting circuit 16 is attached to 38 by fitting or bonding.

Further, with the bulb-type fluorescent lamp 10 assembled as described above, the arc tube 18 is housed at a predetermined position in the globe 17. That is, in this state, each U
The bulb P-shaped fluorescent lamp 31 has a top P
The linear portions 31b of the U-shaped bent bulbs 31 are also located at equal intervals on one circumference centered on a central axis whose longitudinal direction is the vertical direction of the lamp 10. Are arranged at substantially equal intervals on a predetermined circumference. 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 1 to 3.
It is specified within a range of 5 mm. The interval w (w
1, w2) is in the range of 1 to 5 mm, but is preferably 2 to 3 mm in terms of production, and if it exceeds 5 mm, it may not contribute to miniaturization.

Referring 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 that the arc tube 18 has a thickness of 0.8.
mm, the gas pressure is 400 Pa, the discharge path length is 250 mm, and the lamp current is 0.2 A, the lamp efficiency is shown, and the tube outer diameter d1 and the maximum width a for the examples of the interval w of 5 mm and 2 mm are shown. Show the relationship.

The outer diameter of the globe 17 must be 45 mm or less (preferably about 40 mm) in order to approximate the appearance of a general lighting bulb and to increase the adaptability to lighting equipment using the general lighting bulb. However, 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 43
mm.

The lower limit of the tube outer diameter d1 is that the relative lamp efficiency is 9
8 mm, which is 7% or more.

The upper limit of the tube outer diameter d 1 is the maximum width a of the arc tube 18.
Is defined based on the equation of a = 3d1 + 2w from the upper limit of 43 mm. 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 located substantially at the vertices of a regular hexagon (w1 and w2 are substantially equal). Therefore, the maximum value (a: 43, w: 5) is applied to the equation of a = 3d1 + 2w, and 43 = 3d1 + 2w.
By calculating the value of d1 from × 5, the upper limit of the tube outer diameter d1 was set to 11 mm.

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

The reason why the lower limit of the inner diameter of the pipe is set to 6 mm is as follows.
If the thickness is 6 mm or less, the starting voltage becomes high, which is not practical.

Further, when the thickness is 1.1 mm or more, a glass pocket 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 0.7 to 1.0 mm, it is possible to suppress the occurrence of the 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 distance between the end of the globe 17 and the arc tube 18 is A1. When the minimum gap is A3, 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.

Then, in FIG. 10, A2> A1 ≧ A3
And a light distribution S2 of a conventional bulb-type fluorescent lamp having a relationship of A2 = A3 with a cylindrical envelope. The 0 ° direction is 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.

When A2> A1 ≧ A3, the light distribution S1 is A2 =
Compared to the light distribution S2 in the case of A3, the light distribution in the direction of the base 12 is increased and approximates the light distribution of a general lighting bulb. That is, 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, the optimum condition of the light distribution characteristics similar to the general lighting bulb can be defined.

The bulb-shaped fluorescent lamp 10 defined as above
Is used for a lighting fixture of a general lighting bulb, the light distribution of the bulb-shaped fluorescent lamp 10 approximates the light distribution of the general lighting bulb, and thus the light distribution to the reflector near the socket provided in the lighting fixture is improved. , The amount of light irradiation is sufficiently ensured, and the device characteristics according to the optical design of the reflector can be obtained. In addition, 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 with a luminance meter BM-8 manufactured by Topcon Corporation.
It was 0 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 has an exhaust pipe at the other end. The tube 41 is welded and evacuated or, if necessary, amalgam 42
Is provided. The ends of each of the U-shaped bent bulbs 31 located at both ends of the arc tube 18 are provided with a filament coil by a line seal using a mount or the like.
44 is arranged supported by a pair of wells (introduction lines) 45. Each well 45 is connected to a lamp-side wire 48 led out of the U-shaped bent bulb 31 through a dumet wire 46 sealed to glass at the end of the U-shaped bent bulb 31. Have been. In addition, one wells 45
Is provided with an auxiliary amalgam 49 as necessary.

As shown in FIGS. 3, 4 and 7, two pairs of lamp wires 48 led out of the arc tube 18 are connected to the circuit wires 28 led out of the lighting circuit 16. They are twisted and electrically and mechanically connected. The wires 28 and 48 are inserted into and guided by grooves formed in the rib-shaped mounting piece 38 of the partition plate 33. Therefore, a configuration in which a connector is provided in the lighting circuit 16 and the lamp side wire 48 is inserted and connected,
Compared to a configuration in which the lamp-side wire 48 is wound around and connected to a columnar pin protruding from the connector, it does not occupy a large space, can be downsized, and requires no dedicated parts, so it is cheap, easy and reliable. can do. At this time, if the diameter of the circuit-side wire 28 and the diameter of the lamp-side wire 48 are significantly different, the work of twisting 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,
By setting (0.9 × D28) <D48 <(1.1 × D28), it is possible to easily and surely connect 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 the wires 28, 48 may be connected by twisting around this portion.

For the narrow 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 becomes poor.
On the other hand, when the evacuation time needs to be extended, when the diameter of the thin tube 41 becomes large, it becomes impossible to secure a space between the outer surface of the thin tube 41 or the inner surface of the U-shaped bent valve 31 for the wells 45 that are sealed simultaneously with the thin tube 41. Therefore, there is a possibility that the quality of the arc tube 18 may be degraded due to a sealing failure or the like. 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 narrow tube for exhausting is often located at one end in the longitudinal direction of the arc tube. It was difficult to improve. In this regard, in the present embodiment, the thin tube 41
Is within the range of 2.0 <(d2 / d3) <2.8 with respect to the inner diameter d2 of the U-shaped bent valve 31, and the inner diameter d3 of the thin tube 41 is increased. As a result, the exhaust efficiency can be improved, the sealing performance can be ensured, and the quality of the arc tube 18 can be improved. It should be noted that the thin tube 41 serving as an exhaust pipe
Is provided in the middle part of the arc tube 18 in the longitudinal direction,
Exhaust efficiency can also be improved.

The bulb-shaped fluorescent lamp 10 thus configured has an input power rating of 14 W and the arc tube 18 has
At a high frequency of 2.5 W power, the lamp current is 280
mA, the lamp voltage is 65 V, and the total luminous flux is 810 lm by using a three-wavelength 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 the full-wave rectifier 101 is connected to the capacitor C1 via an inductor L1 constituting a filter. ing. A smoothing capacitor C2 is connected to an output terminal of the full-wave rectifier 101 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 a field effect transistor as a MOS type N-channel transistor which is a switching element in parallel with the capacitor C2.
A series circuit is connected to Q1 and a field effect transistor Q2 as a MOS P-channel transistor. 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 the source of the field effect transistor Q2, the filament coils 44, both ends of the arc tube 18 are connected via a ballast choke L2 (which also serves as a resonance function in this embodiment) and a DC cut capacitor C3. One end of each of the filament coils 44 is connected, and a starting capacitor C4 is connected between one end of one of the filament coils 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 a gate of the field effect transistor Q1 and a gate of the field effect transistor Q2. Q1
A series circuit of a capacitor C5 and a capacitor C6 is connected between the gate of the transistor and the gate of the field-effect transistor Q2 and the source of the field-effect transistor Q1 and the source of the field-effect transistor Q2. A series circuit of a Zener diode ZD1 and a Zener diode ZD2 for protecting the gates of the field effect transistors Q1 and Q2 is connected in parallel to the series circuit of the capacitor C6.
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, a resistor R3 of the starting circuit 103 is connected in parallel with the series circuit of the capacitor C5 and the inductor L4.

Between the drain and the 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 the switching is connected.

The field effect transistors Q1 and Q2 may be of a bipolar type. In addition, the inverter main circuit 10
2 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.

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. Field effect transistor Q1
Turns on, a voltage is applied to the circuit of ballast choke L2, capacitor C3 and capacitor C4, and ballast choke L2
And the capacitor C4 resonates. 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 undergo natural resonance to turn on the field effect transistor Q1, and the field effect transistor Q2
To generate a voltage to turn off. 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 the field effect transistor Q1 is turned off.
Generates a voltage that turns on Q2. Further, when the resonance voltage of the ballast choke L2 and the capacitor C4 is inverted, the field effect transistor Q1 turns on and the field effect transistor Q1 turns on.
Q2 turns off. Thereafter, similarly, the field-effect transistor Q1
And the field effect transistor Q2 is turned on and off alternately to generate a resonance voltage, and the arc tube 18 connected in parallel to the capacitor C4 is applied with a starting voltage while preheating one of the filament coils 44, and is started and lit. I do.

The gate voltages of the field effect transistors Q1 and Q2 are made constant by the Zener diodes ZD1 and ZD2.
The gate is protected from 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 The field effect transistors Q1 and Q2 can be controlled. Also, since the resonance circuit (the inductor L4 and the 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, the inductor L4 and the capacitor C6
When the output voltage of the secondary winding L3 is simply output without providing the resonance circuit of the secondary winding L3, the output voltage of the secondary winding L3 depends on the relationship between the starting voltage of the arc tube 18 and the lamp voltage. There is a difference of about 10 times or more in the voltage between when no load is applied and when the load is applied, and it may be difficult to stabilize and protect the gate voltage of the Zener diode or may require an expensive Zener diode.

According to the present embodiment, the pipe inner diameter 6
A plurality of U-shaped bent bulbs 31 of up to 9 mm are arranged in parallel, and the height H2 of the bulbs is 50 to 60 mm and the discharge path length is 2
A light emitting tube 18 having a size of 100 to 300 mm and a total luminous flux of 700 lm or more when lit at a lamp power of 7 to 15 W, and a height of a cover 14 including a base 12 to which the light emitting tube 18 is attached. By setting the height H1 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.

The outer diameter of the tube is 8 to 11 mm and the wall thickness is 0.7
A plurality of U having a curved shape with a top P of about 1.0 mm
Since the light-emitting tube 18 is formed by arranging the V-shaped bent bulbs 31 side by side, 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 correspond to the total luminous flux. The thickness of the tube can be specified so that the inner surface of the tube can be increased by the outer diameter and the strength can be secured. In addition, thickness 1.1m
m or more, the inner diameter of the pipe relative to the outer diameter of the pipe becomes relatively small, so that the inner surface area of the pipe cannot be increased, and the glass wall is formed inside the bent portion 31a bent in a U-shape, and the bent portion is formed. Cracks are likely to occur from the inside of 31a, but by setting the wall thickness to 0.7 to 1.0 mm, it is possible to suppress the occurrence of glass accumulation inside the bent portion 31a.

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. Since the relatively high heat resistant component 26 was mounted on the surface of the substrate 24 and the relatively low heat resistant component 25 was mounted on the opposite surface,
The circuit board 24 can be miniaturized while suppressing the thermal effects of the components 25 and 26 mounted on the circuit board 24, and the cover 14 that houses the circuit board 24 can be miniaturized 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 separated 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 a smoothly curved top P
Are provided, and three or more U-shaped bent valves 31 are sequentially connected. Each of the apexes P is arranged on the same circumference facing the inner surface of the globe 17, and each U-shaped bent valve 31 is connected to each other. Since the lamps are arranged at intervals equal to or less than the outer diameter, the arc tube 18 can be stored in the globe 17 miniaturized to have substantially the same shape as the general lighting bulb, and the globe 17 thus miniaturized Even when the arc tube 18 is housed, uneven brightness can be reduced and the lighting effect can be improved.

Further, the arc tube 18 does not need to be bent into a complicated shape. It is sufficient to form and connect three U-shaped bent bulbs 31 having substantially the same shape. Can be reduced.

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 provided. Is 32-43
mm and a maximum outer diameter of 55 to 6 mm.
When the minimum gap between the arc tube 18 and the top P is A1, the minimum gap between the maximum outer diameter portion and the arc tube 18 is A2, and the minimum gap between the end portion and the arc tube 18 is A3. , A2> A1 ≧
Since the globe 17 covering the arc tube 18 is provided so as to satisfy the relationship of A3, the light distribution in the base direction and the top direction increases,
Optimum conditions of light distribution characteristics similar to general lighting bulbs can be defined. And A1 is 2 to 8 mm, A2 is 3 to 13 mm,
If A3 is 2 to 8 mm, the optimum condition of the light distribution characteristics similar to the general lighting bulb is defined.

Further, the partition plate 33, the arc tube 18 and the glove
Since the members 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.

The linear portion 31b of the U-shaped bent valve 31
And the interval w2 between the adjacent U-shaped bent bulbs 31 are substantially equal, and the interval w1 and the interval w2 are within the range of 1 to 5 mm, so that 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 different states. The circuit configuration can be simplified, and by using the lighting circuit 16 having such a small number of parts, the bulb-type fluorescent lamp 10 can be used.
Is further promoted.

In this way, an external shape similar to a general lighting bulb equivalent to a rated power of 60 W can be realized, so that it can be widely mounted on lighting fixtures using the general lighting bulb, and versatility can be improved. At the same time, discomfort at the time of mounting is eliminated, and the appearance can be improved.

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

FIG. 12 is a partial cross-sectional view of a bulb-type fluorescent lamp according to a second embodiment, FIG. 13 is a partial cross-sectional view of a bulb-type fluorescent lamp according to a third embodiment, and FIG. It is a perspective view of a part of same as the above (third embodiment).

That is, as shown in FIG.
A groove 51 is formed along the outer peripheral portion of the partition plate 33 for fixing the glove 17, the fitting edge 17 a of the glove 17 is fitted into the groove 51, and an adhesive 37 such as a silicon-based material is injected into the groove 51.
Fix 17 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
By inserting the partition plate 33 inside the inside 14 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 luminous tube 18 and the lighting circuit 16 are incorporated into the partition plate 33, and the globe 17 is mounted with the cover 14 attached. The arc tube 18
The member on the 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 not using the globe 17 can be supported.

As shown in FIGS. 13 and 14,
The globe 17 and the arc tube 18 such as the fitting step 35 of the partition plate 33
A notch 57 or a groove is formed in a portion adjacent to the light emitting tube, and an adhesive 37 such as a silicon-based adhesive for bonding the cover 14, the globe 17, and the partition plate 33 is further used.
18 can also be bonded and fixed together. And
This configuration simplifies the manufacturing process and structure and reduces manufacturing costs compared to 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 glove 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. Therefore, while being able to suppress the deterioration of the luminous flux,
An increase in the temperature of the lighting circuit 16 can also be suppressed, and the reliability of the circuit can be improved.

In the above embodiment, the lighting circuit 16
Although one circuit board 24 is arranged horizontally, that is, perpendicular to the insertion direction of the base 12, a plurality of circuit boards 24 may be provided.
Can be arranged in parallel with the direction of insertion.

FIG. 15 is a partially cutaway side view of a light bulb shaped fluorescent lamp according to the fourth embodiment.

As shown in FIG. 15, in this embodiment, 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 components 25 mounted on the upper surface, and the second circuit board 62 located on the lower side has the components 25 mounted on the lower surface. And the second circuit board 62 are arranged with their solder surfaces facing each other. And
The first circuit board 61 located on the base 12 side has components 25 such as electrolytic capacitors and film capacitors which are relatively weak to heat.
Is disposed, and the second circuit board 62 is relatively resistant to 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
These are electrically connected by a jumper wire 65 composed of a plurality of tin-plated electric wires such as three or three, or a film-like flexible cable.
The circuit boards 61 and 62 of this
The first and second circuit boards 61 and 62 are mounted such that the solder surfaces of the first and second circuit boards 61 and 62 face each other. In addition, these first
Between the solder surfaces of the second circuit boards 61 and 62, an insulating sheet 64 having a thickness of about 1 mm, which is a silicon-based film having insulation and heat resistance and having good heat insulation, is disposed. The solder surfaces are insulated from each other and the arc tube 18
From the heat to the first circuit board 61 is suppressed.

In the configuration shown in FIG. 15, the circuit components are divided into two substrates to reduce the size of the lighting circuit 16 on the plane, thereby reducing the size of the circuit mounting structure. In addition, a lamp shape equivalent to a general lighting 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 structure shown in FIG. 15, so-called silicon potting for mounting a silicon adhesive is performed on a film capacitor which is weak to heat, a ballast choke which generates a lot of heat, and the like.
Silicon-based resin rubber may be interposed in the air layer 68 between the partition plate 33 and the air layer 68. 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 hardly transmitted to the component 25, so that the temperature of the component 25 can be reduced.

In the above embodiment, the end of the arc tube 18 is sealed with a line seal using a mount. However, the end of the arc tube 18 is sealed with a pinch seal without using a mount to simplify the mounting manufacturing process. Manufacturing costs can be reduced.

FIG. 16 is a sectional view of a part of an arc tube according to a fifth embodiment, and FIG. 17 is a sectional view of a part of an arc tube according to a 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, two wells 45 are used to directly mount filament coils on mounts used at both ends of a hot cathode fluorescent lamp.
By clamping 44 and making the clamp width 7 mm or less, sophisticated management of the position and inclination required when using bead glass becomes unnecessary, and the manufacturing process of the arc tube 18 is simplified and the manufacturing cost is reduced. And the quality of the arc tube 18 can be improved. 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 is directly pinched and sealed with the arc tube 18, so that the dumet wire 46 made of metal and the glass of the arc tube 18 are sealed. It is difficult to set the heating conditions such as time and temperature to bring the two into close contact with each other, it is necessary to use advanced manufacturing technology, and it is difficult to reduce the manufacturing cost. There is a problem that causes a decrease. Therefore, as shown in FIG.
By sealing the dumet wire 46 with the arc tube 18 by pinching in a state where glass has been welded to the 45 dumet wire (dumet portion) 46 in advance, the sealing property of the arc tube 18 can be easily improved. In addition, the quality of the arc tube 18 can be improved, the yield can be improved, and the manufacturing cost can be reduced. In the structure 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. The shape is not limited to the glass bulb of the electric bulb, and various shapes can be applied, or the globe 17 may 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 part in which a part of the bulb-shaped fluorescent lamp according to the eighth embodiment is cut out. It is a side view.

That is, in the embodiment shown in FIG.
The arc tube 18 is arranged so as to be exposed from the cover 14 without using the globe 17. With this configuration, a more compact bulb-shaped fluorescent lamp can be realized, and the compatibility with lighting equipment using a general lighting bulb can be further increased,
The total luminous flux can be improved.

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

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 bulb-type fluorescent lamp 10 of each of the above-described configurations is used.
Is mounted on a fixture main body provided with a socket used for a general lighting bulb to constitute a lighting fixture. And
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 embodiments, the arc tube 18 is formed by connecting three U-shaped bent bulbs 31 in a U-shape. However, the shape of the arc tube 18 is not limited to this. Two, three, or four U-shaped or H-shaped U-shaped bent valves are juxtaposed, that is, four in the longitudinal direction.
An axial, six-axis, or eight-axis discharge path can be formed to shorten the lamp length.

[0089]

According to the bulb-type fluorescent lamp of the first aspect, a plurality of U-shaped bent bulbs having a tube outer diameter of 8 to 11 mm.
Is adjacent to the interval w1 between the straight portions of each U-shaped bent valve.
The interval w2 of the U-shaped bent valve is substantially equal, and the interval w1
And how the valves are arranged side by side when the distance w2 is within the range of 1 to 5 mm
The arc tube is configured so that the maximum width in the direction is 32 to 43 mm
The maximum width of the circuit board in the direction
A chip-shaped component having relatively high heat resistance is mounted on the surface of the circuit board opposite to the arc tube while having a maximum width of 1.2 times or less the maximum width of the light-emitting tube, and a component having relatively low heat resistance is mounted on the opposite surface. Is implemented , which makes it possible to reduce the size of the arc tube.
The circuit board can be miniaturized, it can be compact in size, which corresponds to General illumination bulb while suppressing the thermal influence of the components mounted on the circuit board.

According to the compact fluorescent lamp of the second aspect, in addition to the effect of the compact fluorescent lamp of the first aspect,
Since the chip-shaped components having relatively high heat resistance are rectifying elements and transistors, and the components having relatively low heat resistance are electrolytic capacitors, the thermal influence from the arc tube can be suppressed.

According to the bulb-type fluorescent lamp of the third aspect, in addition to the effect of the bulb-type fluorescent lamp of the first or second aspect, the N-channel transistor and the P-channel transistor are operated by the control means. 1
Control each to a different state with the output of the two control means,
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 compact fluorescent lamp.

According to the lighting apparatus of the fourth aspect, since the light bulb-shaped fluorescent lamp of any one of the first to third aspects is provided, a lighting apparatus using a general lighting bulb can be used.

[Brief description of the drawings]

FIG. 1 is a side view of a globe of a light-bulb-shaped fluorescent lamp according to a first embodiment of the present invention, as seen through a globe.

FIG. 2 is a bottom view of the globe of the bulb-type fluorescent lamp as seen through;

FIG. 3 is a cross-sectional view of a part of the bulb-type fluorescent lamp.

FIG. 4 is an explanatory diagram showing a lighting circuit and an arc tube according to the first embodiment;

FIG. 5 is a side view of the U-shaped bent valve.

FIG. 6 is a sectional view of a part of the U-shaped bent valve;

FIG. 7 is an explanatory diagram showing a connection state between the lighting circuit and the arc tube according to the first embodiment;

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.

FIG. 9 is an explanatory diagram showing an arrangement relationship of the U-shaped bent valve according to the first embodiment.

FIG. 10 is a light distribution diagram of the above bulb-type fluorescent lamp.

FIG. 11 is a circuit diagram of a lighting circuit according to the embodiment.

FIG. 12 is a cross-sectional view of a part of a bulb-type fluorescent lamp showing a second embodiment of the present invention.

FIG. 13 is a cross-sectional view of a part of a bulb-type fluorescent lamp according to a third embodiment of the present invention.

FIG. 14 is a perspective view of a part of the bulb-type fluorescent lamp;

FIG. 15 is a partially cutaway side view of a light bulb-shaped fluorescent lamp showing a fourth embodiment of the present invention.

FIG. 16 is a sectional view of a part of an arc tube showing a fifth embodiment of the present invention.

FIG. 17 is a sectional view of a part of an arc tube showing a sixth embodiment of the present invention.

FIG. 18 is a partially cutaway side view of a light bulb-shaped fluorescent lamp showing a seventh embodiment of the present invention.

FIG. 19 is a side view in which a part of a light bulb shaped fluorescent lamp according to an eighth embodiment of the present invention is cut away.

[Explanation of symbols]

10 Bulb-type fluorescent lamp 12 Cap 14 Cover 16 Lighting circuit 18 Arc tube 24 Circuit board 25 (Chip-like with relatively high heat resistance) Parts 26 (Comparatively low heat resistance) Parts 31 U-shaped bent bulb 32 communication Tube 31a Bent portion 31b Straight portion 33 Partition plate 34a Mounting hole 102 Inverter main circuit 104 Control circuit as control means Q1 Field effect transistor as N channel transistor Q2 Field effect transistor as P channel transistor L2 Ballast choke L3 Secondary Winding

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Takayuki Fujita 4-3-1 Higashishinagawa, Shinagawa-ku, Tokyo Inside Toshiba Lighting & Technology Corporation (56) References JP-A-9-238474 (JP, A) 58-192457 (JP, U) Japanese Utility Model 7-11716 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01J 61/30-61/34 F21S 5/00 F21V 23 / 00

Claims (4)

(57) [Claims] 1. A plurality of U-shaped bent valves having a tube outer diameter of 8 to 11 mm and having a straight portion and a bent portion are connected to a straight portion.
Are arranged along the circumference, and each U-shaped bent valve is
The interval w1 between the line portions and the interval w2 between the adjacent U-shaped bent valves
And the distance w1 and the distance w2 are 1 to 5 mm.
Within the range, one discharge path is formed by the communication pipe
Connect the straight parts of the U-shaped bent valve to form
And the maximum width in the valve side-by-side direction is 32-43 mm
And a mounting hole into which the entire end of the linear portion of the arc tube is inserted.
With the entire end of the straight part of the arc tube inserted into the mounting hole of
The arc tube is attached and the partition plate; partition plate as one side all the ends of the linear portion of the arc tube facing
A circuit board having a maximum width dimension not more than 1.2 times the maximum width in the direction in which the bulbs are arranged and having a relatively high heat resistance on the surface of the circuit board facing the arc tube. A lighting circuit in which a component having a relatively low heat resistance is mounted on the opposite surface and a component having a relatively low heat resistance is accommodated in a cover; a partition plate is fixed so as to cover the lighting circuit and
A fluorescent lamp comprising : a cover having gold; 2. A chip-shaped component having relatively high heat resistance is a rectifying element and a transistor, and a component having relatively low heat resistance is an electrolytic capacitor.
A bulb-shaped fluorescent lamp as described. 3. A lighting circuit includes an N-channel transistor and a P-channel transistor connected in series to an input power supply.
A half-bridge type inverter main circuit having at least one pair of channel transistors 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 ballast choke. 2. A magnetic head according to claim 1, further comprising a secondary winding common to the N-channel and P-channel transistors magnetically connected, and control means for driving each transistor by the secondary winding. Or 2
A bulb-shaped fluorescent lamp as described. 4. A lighting fixture comprising the light bulb-shaped fluorescent lamp according to claim 1.