JP2001028255A - Bulb-type fluorescent lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bulb-type fluorescent lamp allowing miniaturization of not only a cover but also the whole, by miniaturizing a wiring board mounted with a lighting circuit. SOLUTION: This bulb-type fluorescent lamp having a rated electric power consumption of 20-25W has a fluorescent lamp 1 formed compactly, such that a curved discharge path is formed inside the fluorescent lamp 1, having a pair of electrodes 1b sealed in both ends of a translucent discharge vessel 1a provided with a phosphor layer on the inside face side, and charged with an ionization medium including mercury and a rare gas inside it, a lighting circuit 2 mounted in a wiring board 2a of a maximum diameter of 35-42 mm, for lighting the fluorescent lamp 1 at a high frequency, a cover 3 storing the lighting circuit 2, and a base 4. Instead of the above wiring board 2a, the wiring board 2a can have an area 50-60 mm2 per rated electric power watt consumption (W) of the bulb-type fluorescent lamp.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a compact fluorescent lamp.

[0002]

2. Description of the Related Art A bulb-type fluorescent lamp has a structure in which a compact fluorescent lamp and a lighting circuit thereof are integrated. It has been widely used in place of incandescent lamps because it is a light source having both high lamp efficiency and long life.

A compact fluorescent lamp has a compact fluorescent lamp, a lighting circuit for lighting the fluorescent lamp, a cover for housing the lighting circuit therein, and a base provided at a base end of the cover. And a configuration in which a globe surrounding the fluorescent lamp is fixed to the cover, and a configuration without the globe. In addition, the shape of the glove is A-shaped bulb-shaped A
There are a G-shaped globe, a T-shaped globe with a T-shaped bulb, and a G-shaped globe with a G-shaped bulb.

The A-shaped globe has recently been employed in a more compact bulb-type fluorescent lamp ("Neoball ZA-type" manufactured and sold by the present applicant). This bulb-type fluorescent lamp has a rated power consumption of 14 W, an outer diameter of 60 mm, and a total length of 1
23 mm. This is a size and an appearance considerably close to a maximum diameter of 60 mm and a total length of 109 mm of a 60 W incandescent lamp for general lighting, thereby significantly improving the adaptability to an incandescent lamp lighting fixture.

By the way, in order to increase the adaptability to the incandescent lamp luminaire, not only the outer diameter and the overall length of the bulb-type fluorescent lamp are made as close as possible to the incandescent lamp, but also the cover part is reduced in size, that is, the diameter is reduced. It is important to.

However, since the lighting circuit is housed inside the cover and the lighting circuit is mounted on the wiring board, it is necessary to downsize the wiring board in order to reduce the size of the cover.

[0007]

However, a lighting circuit is mounted on the wiring board, and the lighting circuit causes a circuit loss such as a high-frequency conversion loss and generates heat due to the circuit loss. Come. Therefore, it is necessary to keep the temperature within the allowable temperature rise in order to perform the required circuit operation on the circuit components normally, and thus there is a limit to the miniaturization of the wiring board.

Further, when the rated power consumption of the bulb-type fluorescent lamp is increased to 23 to 25 W to obtain a high light output corresponding to a 100 W incandescent lamp for general lighting, the circuit loss of the lighting circuit increases. In addition, it is difficult to downsize the wiring board of the lighting circuit.

The inventor has found that the rated power consumption is 20 to 25 W
As a result of various investigations and investigations to reduce the size of the wiring board of the lighting circuit in a large range, the limit of miniaturization of the wiring board is proportional to the input power of the lighting circuit, that is, the rated power consumption of the bulb-type fluorescent lamp. Although the wiring board becomes large, the wiring board in the high light output bulb-type fluorescent lamp corresponding to the conventional 100 W-type incandescent lamp for general lighting requires 70 W
Although it was about mm ² , it was found that further miniaturization was possible.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a compact fluorescent lamp in which the cover is downsized by reducing the size of the wiring board on which the lighting circuit is mounted, and thus the overall size is downsized.

[0011]

According to a first aspect of the present invention, there is provided a light-bulb-shaped fluorescent lamp having a compact shape such that a bent discharge path is formed therein.
Including a phosphor layer disposed on the inner surface side of the translucent discharge vessel, a pair of electrodes sealed at both ends of the translucent discharge vessel, and mercury and a rare gas sealed inside the translucent discharge vessel A fluorescent lamp with an ionizing medium; maximum diameter of 35-4
A lighting circuit mounted on a 2 mm wiring board for lighting a fluorescent lamp at a high frequency; a lighting circuit housed inside;
A cover for supporting the fluorescent lamp; and a base provided at a base end of the cover, wherein a rated power consumption is 20 to 25 W.

In the present invention and each of the following inventions, definitions and technical meanings of terms are as follows unless otherwise specified.

<Regarding the Fluorescent Lamp> (Regarding the Translucent Discharge Vessel) The translucent discharge vessel has an outer diameter of 11 mm or less, preferably 8 to 11 mm, and more preferably 3 to 9 mm for further miniaturization. Are formed in a compact shape such that a bent discharge path is formed therein. For example, a single elongated glass tube is bent in a saddle shape, or a plurality of U-shaped glass tubes bent in a U-shape are connected by a connecting tube, and a portion of each U-shaped glass tube is placed on the circumference. By arranging or arranging the gaps formed between the U-shaped glass tubes back and forth so that they can be seen from one direction, and further by spirally winding the glass tubes, The light discharge vessel can be formed in a compact shape. The connecting pipe can be formed by a blow-off method, or can be formed by glass welding using a separately prepared pipe.

The outer diameter of the translucent discharge vessel can be freely selected within the above numerical range. However, if the outer diameter is less than 3 mm, the lamp current is excessively reduced, so that the desired lamp input can be reduced. In order to ensure this, it is necessary to compensate for the decrease in lamp current by increasing the length of the discharge path, making it impossible to reduce the size. In addition, since the lamp voltage increases along with this, the starting voltage also increases, the lighting circuit becomes large, and the cost increases.

Conversely, the outer diameter of the translucent discharge vessel is 11 mm.
Is exceeded, the translucent discharge container becomes too large, making it difficult to obtain a compact fluorescent lamp.

The inner diameter of the light-transmitting discharge vessel is substantially proportional to the outer diameter, and is an average value obtained by subtracting twice the thickness of the light-transmitting discharge vessel from the outer diameter.

Further, a seal portion, for example, a pinch seal portion is formed on at least both ends of the translucent discharge container, and if necessary, a pinch seal portion is also formed in the middle in addition to this. For example, in the case where a plurality of U-shaped glass tubes are connected by a connecting tube to form a light-transmitting discharge vessel, a seal portion may be formed in the middle of the light-transmitting discharge vessel. That is, seal portions are formed at both ends of each U-shaped glass tube, and intermediate portions near the ends are connected to each other by a connection tube to form one bent discharge path.

On the other hand, the outer diameter of the length of the translucent discharge vessel, that is, the length of the discharge path formed between a pair of electrodes sealed at both ends of the translucent discharge vessel, that is, the discharge path length, is within the above range. Within this range, it can be set to 400 to 500 mm according to the lamp power of the bulb-type fluorescent lamp.

Further, as long as the translucent discharge vessel has the above-mentioned structure, its material is not limited, but it can be generally made of glass. In this case, it is economical to use soft glass such as soda lime glass or lead glass as the glass, but if necessary, hard or semi-hard glass such as borosilicate glass can be used.

Further, the cross-sectional shape of the light-transmitting discharge vessel is generally circular, but may be non-circular, for example, elliptical or any other cross-sectional shape, if necessary.

(Regarding Phosphor Layer) The phosphor layer is used for converting the wavelength of ultraviolet light generated by electric discharge to obtain visible light in a desired wavelength range. The type of phosphor used is not limited, but a three-wavelength light-emitting phosphor is preferable because it can obtain excellent heat resistance and load characteristics and has excellent color rendering properties.

In the present invention, the phrase “the phosphor layer is disposed on the inner surface side of the light-transmitting discharge vessel” means that the phosphor layer is directly formed on the inner surface of the light-transmittable discharge vessel. It means that it may be formed indirectly via a protective film, a reflective film, or the like.

Further, as the protective film, Al₂O₃Fine
A film configuration mainly composed of particles can be used. Crystal structure
The structure may be either β-form or α-form. However, α-form
Al ₂O₃By using a protective film made of
Light flux rising characteristics can be obtained.

(Electrode) A pair of electrodes are sealed at both ends of the translucent discharge vessel via seal portions, and the electrode structure may be any of a filament electrode and a ceramic electrode.

When the electrode is a filament electrode and the seal portion has a pinch seal structure, a bead mount structure is employed to prevent the shape of the filament from being disturbed during sealing. Both ends can be pinch sealed.

When a ceramic electrode is used, the ceramic electrode has the following configuration. That is, the ceramic electrode comprises a composite oxide semiconductor ceramic,
A conductive base supporting the composite oxide semiconductor ceramics.

The composite oxide semiconductor ceramic is a composite oxide semiconductor ceramic of an oxide containing an alkaline earth element and a transition metal element as main components. The surface of the composite oxide semiconductor ceramic is coated with a carbide such as TaC and / or a nitride such as TiN. Forming these coatings on the surface has an effect of preventing sputtering of a thermionic emission material such as Ba. However, there is no problem because the thermionic emission material reaches the surface by thermal diffusion from the inside. Further, the coating also has a function of assisting electric conduction when the temperature of the composite oxide semiconductor ceramic is low, such as at the time of starting.

The “conductive base” may be made of any material as long as it is a member having appropriate conductivity and supporting the composite oxide semiconductor ceramics.

(Ionizing Medium) The ionizing medium enclosed in the translucent discharge vessel contains mercury and a rare gas.

Since the temperature of the mercury is high during the operation of the bulb-type fluorescent lamp, mercury is generally supplied by amalgam in order to optimally control the mercury vapor pressure at a high temperature. By using amalgam, it is possible to stably control the mercury vapor pressure even when the ambient temperature changes, and thus to obtain a stable light output. Further, by arranging the auxiliary amalgam in the vicinity of the electrode, mercury vapor can be supplied at the initial stage of lighting, and the luminous flux rising characteristics can be improved. In order to distinguish the former amalgam from the auxiliary amalgam, it is hereinafter referred to as "main amalgam".

The main amalgam releases mercury necessary for low-pressure mercury vapor discharge and supplies mercury vapor into the translucent discharge vessel, and is preferably housed in a thin tube. And the main amalgam is Bi-In-Hg, Bi-In-Sn-H.
In addition to the composition such as g, a material containing 4.5% by weight or more, preferably 6% by weight of mercury can be used in order to improve the light flux rising.

However, when the content of mercury reaches the above-mentioned content, care should be taken because mercury easily oozes out on the surface of the amalgam and causes stickiness. That is, when producing amalgam, it is possible to rapidly reduce the size of the crystal particles by cooling and to perform a non-sticky treatment on the surface of the amalgam.

The amount of main amalgam to be enclosed is 40 to 1
About 20 mg is good.

Further, the main amalgam is preferably processed into particles of an appropriate size, and a plurality of particles are preferably enclosed in a capillary so that a required amount is enclosed.

Furthermore, as the outer diameter of the light-transmitting discharge vessel becomes smaller, it takes more time for the mercury vapor pressure in the discharge space of the light-transmitting discharge vessel to be evenly distributed during lighting. It can be supplied at a plurality of locations on the translucent discharge vessel.

The auxiliary amalgam is configured such that by placing an amalgam-forming metal, for example, indium In, at a required position, mercury moves in the translucent discharge vessel to form an amalgam. The amalgam-forming metal can be applied to a metal substrate such as stainless steel by vapor deposition or the like.

Further, when the auxiliary amalgam is disposed near the electrode, it can be supported by welding to the lead wire of the electrode. When the auxiliary amalgam is provided at a position remote from the electrode, the auxiliary amalgam can be supported by a member such as an appropriate lead wire having a base end sealed to the seal portion.

The rare gas can be filled with one or more of argon, krypton, xenon, neon and the like and mixed at a pressure of several thousand to several tens of thousands Pa.

<Lighting Circuit> In the present invention, the lighting circuit is a circuit means for starting the fluorescent lamp and lighting it at a high frequency, and is mounted on a wiring board having a maximum diameter of 35 to 42 mm. In addition, a power supply function for supplying electric energy for discharge to the fluorescent lamp and a current limiting impedance function for compensating for the negative characteristics of the fluorescent lamp are provided. A starting voltage supply function for starting discharge by applying a voltage can be provided.

(Regarding the Wiring Board) The wiring board may have any shape as long as the maximum diameter is 35 to 42 mm, but in order to obtain the largest mounting area among the limited maximum diameters as described above, Preferably, it is substantially circular.

The reason why the maximum diameter of the wiring board is set in the above range is that the rated power consumption of the bulb-type fluorescent lamp is 20%.
This is because the minimum diameter is allowed in the range of ２５25 W. Therefore, when the rated power consumption is about 20 to 22 W, the maximum diameter can be made about 35 to 38 mm. When the rated power consumption is 23 to 25 W, 39 to 4
It is preferable to set it to about 2 mm.

Further, in order to reduce the maximum diameter of the wiring board as described above and to mount necessary circuit components as required, it is effective to reduce the circuit loss of the lighting circuit as much as possible. Efficiency is 88% or more, preferably 90%
%.

Another means is to reduce the size of circuit components as much as possible, and in particular, it is effective to reduce the size of inductors, which are winding components. To reduce the inductor, the operating frequency of the lighting circuit must be as high as possible. However, it should be noted that high-frequency noise increases as the operating frequency increases.

Another different means is to use a drain-exposed molded package MOSFET having a DIP terminal as a switching means of the lighting circuit. In configuring a half-bridge inverter using a pair of the MOSFETs, a MOSFE
T can be DIP-mounted adjacent to each other in an upright position, thereby increasing the mounting density. But MOSFET
In this case, short-circuiting due to contact between the drains due to the falling down is likely to occur. In order to deal with this, the drains may be arranged so that the drains do not contact each other.

Another different means is that the lighting circuit has a simple circuit configuration with a small number of circuit components. For example, when a half-bridge inverter using a pair of complementary (P-channel and N-channel) MOSFETs is used, a single gate drive circuit can be commonly used for a pair of MOSFETs. Although a pair of N-channel MOSFETs is used, the gate drive circuit can be simplified by forming a half-bridge inverter using a common feedback circuit for the gate drive circuits.

(Regarding Power Supply Function) As a power supply for the fluorescent lamp, a high-frequency AC that is small, lightweight, easy to control, and capable of efficient lighting is used.

For lighting the fluorescent lamp by high-frequency alternating current, it is preferable to use a high-frequency inverter.

(Regarding the Current-Limiting Impedance Function) The current-limiting impedance is the inductance,
Any one or a combination of a plurality of capacitances and resistances can be used. However, although the inductance and the capacitance are good in that the power loss is small, the inductance is optimal in consideration of the fact that the control is easier and the size can be reduced in high-frequency AC lighting.

When the inductance is at least a part of the current limiting impedance, the inductance can be secured by the leakage inductance of the choke coil and the leakage transformer.

(Regarding the starting voltage supply function) The starting voltage supply function is a function of applying a high starting voltage between the electrodes when the fluorescent lamp is started to start discharging the fluorescent lamp.

When the electrode is made of a ceramic electrode, a glow discharge occurs at the time of starting, and the glow discharge is transferred to an arc discharge, and the fluorescent lamp becomes a so-called lighting state. The power supplied to the power supply increases, the glow-arc transition time is shortened, and the starting time is shortened.

In order to increase the starting voltage at the time of starting, for example, a capacitor is connected in parallel with the fluorescent lamp so that the capacitor resonates in series with the current limiting inductance at the time of starting. Further, the output voltage of the high-frequency inverter may be increased for a predetermined time at the time of starting.

When a filament electrode is used as the electrode, a pair of one or one of the filament electrodes is connected in series with a current limiting inductor and a capacitor that resonates in series, so that the filament is heated to emit thermionic electrons. It can make it easier to start. In this case, the capacity of the capacitor is divided into a first capacitor passing through the filament electrode and a second capacitor not passing through the filament electrode, and the first capacitor is opened by breaking the filament electrode. By setting the second capacitor in such a state that the terminal voltage of the second capacitor is reduced to such an extent that the discharge of the fluorescent lamp cannot be maintained in the state where the fluorescent lamp is kept, the discharge of the fluorescent lamp can be prevented.

<Regarding the Cover> The cover accommodates at least the lighting circuit therein, supports the fluorescent lamp, and supports the base at the base end. Furthermore, in a bulb-type fluorescent lamp provided with a globe, the globe is fixed to the cover.

An auxiliary member such as a partition plate can be used to house and fix the lighting circuit inside the cover. That is, the wiring board can be housed in the cover by supporting the wiring board on the partition plate and mounting the partition plate on the cover so as to close the opening end of the cover. In this case, the partition plate can be further fixed to the cover together with the glove.

However, it is needless to say that the wiring board can be directly supported and stored in the cover if necessary.

A partition plate can also be used to support the fluorescent lamp on the cover. That is, the fluorescent lamp is supported by the partition plate, and the partition plate is fixed to the opening end of the cover.

By attaching a partition plate to the opening end of the cover, unnecessary opening can be prevented from being formed in the cover.

Further, the cover is preferably formed thin from the middle part to the base part in order to support the base at the base end and to increase the adaptability to the lighting fixture for incandescent lamps.

However, the shape of the entire cover should be determined in consideration of the design as a compact fluorescent lamp. That is, a cover with gloves,
It is natural that the shape of the cover differs greatly from the cover in which the fluorescent lamp is exposed without gloves, mainly due to design considerations.

The shape of the cover should be different depending on the shape of the glove. For example, in the case of a G-shaped globe, the cover can be shaped like a portion of a sphere so that it cooperates with the glove to form a shape close to a G-shaped valve. Also, in the case of an A-shaped globe, the cover can be formed into a shape as close to an A-shaped valve as possible in cooperation with the glove.

<Regarding the base> The base is a power receiving means and functions as a means for mechanically supporting the light bulb-shaped fluorescent lamp. A known base can be appropriately selected and used, but an E26 screw base, which is widely used as a bulb-type fluorescent lamp, is appropriate.

The means for supporting the base on the cover is not particularly limited, and may be supported by known support means, for example, mechanically fixed with a punch, ie, caulking.

<Operation of the Present Invention> In the present invention, since the maximum diameter of the wiring board of the lighting circuit is 35 to 42 mm, the maximum diameter of the cover is set to a small size corresponding to the maximum diameter of the wiring board, for example, the size of the cover. The maximum diameter can be 50 mm. Accordingly, the overall length and outer diameter of the bulb-type fluorescent lamp can be reduced. For example, a bulb-type fluorescent lamp equipped with an A-shaped globe has a total length of 125 to 145 mm, an outer diameter of 55 to 75 mm, a rated power consumption of 20 to 25 W, and emits a large amount of light such as a 100 W incandescent lamp. You can get a lamp.

According to a second aspect of the present invention, there is provided a light-bulb-shaped fluorescent lamp according to the first aspect, wherein the light-transmitting bulb is formed in a compact shape so that a bent discharge path is formed therein. A discharge vessel, a phosphor layer disposed on the inner surface side of the light-transmitting discharge vessel, a pair of electrodes sealed at both ends of the light-transmitting discharge vessel, and mercury and rare earth sealed in the light-transmitting discharge vessel. A fluorescent lamp provided with an ionizing medium containing a gas; and the area of one surface is 50 per watt of rated power consumption.
A lighting circuit mounted on a wiring board of ６０60 mm ² for lighting a fluorescent lamp at a high frequency; a cover accommodating the lighting circuit therein and supporting the fluorescent lamp; and a base provided at a base end of the cover. Equipped with rated power consumption of 20 to 2
5 W.

According to the present invention, the area of the wiring board is defined per 1 W of rated power consumption of the bulb-type fluorescent lamp. Therefore, the area of the wiring board is 1000 to 1200 mm ² when the rated power consumption is 20 W, and 1150 when the rated power consumption is 23 W.
In the case of ~1380mm ^2, 25W 1250~1500
a mm ^2. When the wiring board is circular, 20 W has a diameter of 35.7 to 39.1 mm, 23 W has a diameter of 38.3 to 41.9 mm, and 25 W has a diameter of 39.9 to 43.
7 mm.

The "one surface" of the wiring board refers to the main mounting surface of the circuit component. Even when both sides are used for mounting, the area of one side of the wiring board is defined.

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 has an operating frequency of 70 kHz or more.

The present invention specifies a configuration for miniaturizing circuit components effective for miniaturizing a wiring board.

That is, the inductive impedance and the capacitive impedance are functions of the frequency, and the higher the frequency, the smaller the circuit components.

In the conventional bulb-type fluorescent lamp, the operating frequency is on the order of 50 kHz, but in the present invention,
Since the frequency is higher as described above, circuit components, particularly winding components, are reduced in size.

However, since the high frequency noise increases as the frequency increases, the necessity of noise removal increases.

Therefore, the operating frequency of the lighting circuit is 7
A range of 0 to 90 kHz is preferred.

Thus, in the present invention, by increasing the operating frequency, it is possible to reduce the size of circuit components, particularly winding components, and to use a small-sized wiring board.
Accordingly, a compact compact fluorescent lamp can be obtained.

According to a fourth aspect of the present invention, there is provided a light bulb-type fluorescent lamp according to any one of the first to third aspects, wherein the wiring substrate is substantially circular.

When the wiring board is circular, the minimum outer diameter is obtained when the area of the wiring board is constant.

That is, the substantially circular wiring board effectively contributes to downsizing of the compact fluorescent lamp.

According to a fifth aspect of the present invention, there is provided the bulb-type fluorescent lamp according to any one of the first to fourth aspects, wherein the lighting circuit is in an upright state so that the wiring substrate and the drain do not come into contact with each other when falling down. It is characterized in that it includes a pair of drain-exposed molded package MOSFETs that are adjacently disposed and DIP-mounted on a wiring board.

The present invention specifies a configuration in which the mounting density of the switching means of the lighting circuit is increased so that a small-sized wiring board can be used.

That is, the drain-exposed molded package type MOSFET has a DIP terminal and can be mounted in an upright state. This MOSFET is flat and has a drain exposed on one flat surface, and the other surface is a mold package portion. And DIP
The terminal extends in a direction parallel to the bias plane.

In a lighting circuit such as a half-bridge type inverter using a pair of switching means that alternately turn on and off, mounting the switching means in an upright state can increase the mounting density.

However, since the drain is exposed,
If a pair of switching means are placed inadvertently close to each other and the switching means falls down for some reason,
The drains may come into contact with each other to cause a short circuit.

Therefore, in the present invention, the drains are arranged so that the drains do not short-circuit while the pair of switching means approach each other. For example, they may be arranged as listed below. (1) The drain of the other switching means is opposed to the mold package portion of one of the switching means. (2) Both mold package portions are opposed to each other. (3) One drain is lined up so as to face the other mold package portion. (4) The other surface is adjacent to the surface of one mold package portion at an appropriate angle, for example, a right angle.

Note that "DIP mounting" means that DIP terminals are inserted into wiring holes of a wiring board and mounted in an upright state.

[0085]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of a compact fluorescent lamp of the present invention.
It is a partial sectional front view showing the embodiment.

FIG. 2 is a plan view of the glove as seen through.

FIG. 3 is an exploded perspective view.

FIG. 4 is a plan view showing a mounting state of the lighting circuit on the wiring board.

FIG. 5 is a plan view of the wiring board.

In each figure, 1 is a fluorescent lamp, 2 is a lighting circuit, 3 is a cover, 4 is a base, 5 is a globe, and 6 is a partition plate.

<About Fluorescent Lamp 1> Fluorescent Lamp 1
Includes a light-transmitting discharge vessel 1a and an electrode 1b.

The translucent discharge vessel 1a has four outer diameters of 10 m.
The U-shaped glass tubes 1a1 of m are connected by three connecting tubes 1a2, and the U-shaped glass tubes 1a1 are formed so as to be equally distributed on the circumference.

Each U-shaped glass tube 1a1 has seal portions 1a3 formed at both ends thereof, and one thin tube 1a4 projects from one seal portion 1a3 to the outside.

The thin tube 1a4 communicates with the inside of the translucent discharge vessel 1a. The thin tube 1a4 is used for evacuating the inside of the translucent discharge container 1, storing main amalgam (not shown), and filling a rare gas.

The connecting pipe 1a2 is formed by a blow-down method.

The phosphor layer is mainly composed of a three-wavelength phosphor, and is formed on the inner surface side of the translucent discharge vessel 1a via a protective film mainly composed of alumina fine particles (not shown). Have been.

The electrode 1b is constituted by a filament electrode. The electrode 1b is formed by coating a double coil made of a tungsten wire with an oxide of an electron emitting material made of an alkaline earth metal.

The main amalgam is housed in the thin tube 1a4 of the translucent discharge vessel 1. And the main amalgam,
Hg consists of 6% by weight of Bi-In-Hg, and encapsulates three particles having a particle size of about 2.5 mm.

The auxiliary amalgam (not shown) is formed by plating a thin plate of stainless steel with indium In, and is welded to the lead wire so as to be located near the main amalgam.

<Regarding Lighting Circuit 2> The lighting circuit 2 is mainly composed of a half-bridge type inverter, and energizes and lights the fluorescent lamp 1 and is housed in a cover 3 described later. The high-frequency output terminal is connected to the fluorescent lamp 1 as required, as will be described later.

The lighting circuit 2 includes a wiring board 2a and circuit components 2b mounted thereon. The main circuit component 2b is mounted on the lower surface of the wiring board 2a in the figure.

As shown in FIG. 5, the wiring board 2a is made of glass epoxy resin having a maximum diameter R of 40.5 mm, and has a substantially circular shape. Four wrapping pins P1, P2, P3, and P4 are implanted as high-frequency output terminals, and wire guiding notches n1, n2, and n are provided near each of the wrapping pins.
3, n4 are formed on the wiring board 2a. Four external lead wires (not shown) derived from a pair of electrodes 1b at both ends of the fluorescent lamp 1 are configured to be lap-connected to lap pins. The lapping connection mode will be described later.

On the other hand, as shown in FIG. 4, the insulation-coated conductor 2c is led out directly from the AC input terminal of the wiring board 2a, and is connected to the base 4.

On the other hand, since the cavity inside the cover 3 has an inverted truncated conical shape, the circuit component 2b has a generally inverted conical shape having a smooth capacitor C1 formed of an electrolytic capacitor having a tall profile as a vertex. Wiring board 2
a.

A pair of switching means Q1, Q2
Consists of a drain-exposed molded package MOSFET having a DIP terminal. Then, when the switching means Q1 and Q2 fall down in the mounted state, the drains D are arranged in a staggered position so that the drains D do not come into contact with each other so as not to be short-circuited. I have.

Note that the circuit configuration of the lighting circuit will be described later. The symbol p in the figure indicates a mold package portion.

<Cover 3> The cover 3 is formed by molding a white light-shielding heat-resistant synthetic resin into a cup-shaped cylinder. Then, the base end 3a is narrowed narrowly,
b is open and the inside forms a cavity for housing circuit components.

<Regarding the base 4> The base 4 is made of an E26 type screw base, and is attached to the base end 3a of the cover 3 by caulking with a punch. The input end of the lighting circuit 2 is connected to the center contact of the base 4 and the base shell.

<Regarding Globe 5> The globe 5 has a milky white light diffusion property by applying light diffusing fine particles to the inner surface of a transparent glass bulb, has an A shape, and has a fluorescent lamp 1.
Siege. And the base end of the glove 5 is the cover 3
Glove 5 and cover 3
Form an envelope AJ.

<About the Partition Plate 6> The partition plate 6 supports the fluorescent lamp 1 and the wiring board 2a, and divides the inside of the envelope AJ into a light emitting room A and a lighting circuit storage room B.

The partition plate 6 has the following structure for supporting the fluorescent lamp 1 and the lighting circuit 2 and for fixing it to the cover 3 together with the globe 5.

That is, the partition plate 6 includes a cylindrical portion 6a which is open downward in the figure and whose top is closed, and a flange portion 6b which protrudes outside the cylindrical portion 6a. And the cylindrical part 6a
Of the translucent discharge vessel 1a of the fluorescent lamp 1
An insertion hole 6a2 for inserting the vicinity of the seal portion at both ends of the U-shaped glass tube 1a1 is formed, and the vicinity of the seal portion of the U-shaped glass tube 1a1 is inserted and bonded with a silicone adhesive (not shown). The fluorescent lamp 1 is supported and fixed on a partition plate 6.

The wiring board 2a is inserted and supported inside the lower end of the cylindrical portion 6a of the partition plate 6.

Further, the flange 6b of the partition plate 6 is
The partition plate 6 is inserted into the cover 3 so as to be in contact with the inner surface near the opening, and is fixed with a silicone adhesive (not shown) with the open end of the glove 5 inserted into the open end of the cover 3 from above. Have been.

FIG. 6 shows a first embodiment of the compact fluorescent lamp of the present invention.
It is a circuit diagram showing a lighting circuit in the embodiment.

In the figure, the same parts as those in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted.

Hereinafter, the circuit configuration will be described.

In the figure, AS is a low-frequency AC power supply, f is an overcurrent fuse, NF is a noise filter, RD is a rectified DC power supply, HFI is a high-frequency inverter, LC is a load circuit, and FL is a fluorescent lamp.

The low-frequency AC power supply AS comprises a commercial 100 V AC power supply.

The overcurrent fuse f is formed of a pattern fuse integrally formed on the wiring board 2a, and is protected from being blown when an overcurrent flows, so that the lighting circuit 2 is not burned.

The noise filter NF includes a low-frequency AC power supply A.
Interposed between S and the rectified DC power supply RD, high-frequency noise generated by switching in the high-frequency inverter HFI is removed so as not to flow to the low-frequency AC power supply AS.

The rectified DC power supply RD includes a bridge rectifier circuit BRC and a smoothing capacitor C1, and converts a low-frequency AC voltage into a smoothed DC power supply voltage.

The high-frequency inverter HFI comprises a first switching means Q1, a second switching means Q2, a gate drive circuit GDC and a starting circuit ST to constitute a half-bridge type inverter.

The first switching means Q1 is composed of an N-channel MOSFET, the drain of which is connected to the positive electrode of the rectified DC power supply RD, and the source of which is connected to the source of the second switching means Q2.

The second switching means Q2 is composed of a P-channel MOSFET, and its drain is connected to the negative electrode of the rectified DC power supply RD.

The gate drive circuit GDC includes feedback means F
B, an LC resonance circuit RC, a gate voltage output means GVO, and a gate protection circuit GP.

The feedback means FB is constituted by an auxiliary winding magnetically coupled to a current limiting inductor L2 described later.

The LC resonance circuit RC is configured by connecting an inductor L1 and a capacitor C2 in series with the feedback means FB.

The gate voltage output means GVO is configured to extract the resonance voltage appearing across the capacitor C2 of the LC resonance circuit RC via the capacitor C3. One end of the capacitor C3 is connected to a connection point between the capacitor C2 and the inductor L1, and the other end of the capacitor C3 is connected to respective gates of the first and second switching means Q1, Q2.

Furthermore, the other end of the capacitor C2 is connected to the sources of the first and second switching means Q1, Q2.

The gate protection circuit GP is configured by connecting a circuit formed by connecting a pair of zener diodes in reverse series to the gate voltage output means GVO, and clamps an excessive gate voltage to a required value.

The gate drive circuit GDC has the above-mentioned circuit configuration. The resonance voltage appearing at both ends of the capacitor C2 is clamped to a constant value by the gate protection circuit and passes through the gate voltage output means GDO. It is applied between the gate and source of the first and second switching means Q1, Q2, and turns on the switching means Q1, Q2 alternately.

The starting circuit ST includes resistors R1, R2, R3
Consists of

The resistor R1 has one end connected to the positive electrode of the rectified DC power supply RD and the other end connected to the first switching means Q.
1 and one end of the resistor R2 and to the gate-side output terminal of the gate voltage output means GVO of the gate drive circuit GDC, that is, the other end of the capacitor C3.

The other end of the resistor R2 is connected to the connection point between the inductor L1 of the LC resonance circuit RC and the feedback means FB.

The resistor R3 has one end connected to the first and second resistors.
Are connected to the connection point of the switching means Q1, Q2, that is, the source and the output terminal on the source side of the gate voltage output means GVO, and the other end is connected to the negative electrode of the rectified DC power supply RD.

The load circuit LC includes a current limiting inductor L2, a DC cut capacitor C4, and a pair of resonance capacitors C.
In addition to the series circuit of 5A and C5B, the resonance capacitor C5
A and a fluorescent lamp FL connected in parallel to C5B.

The fluorescent lamp FL has the structure shown in FIGS.

One resonance capacitor C5A is connected to the load circuit LC via the filament of the pair of electrodes 1b of the fluorescent lamp FL.

On the other hand, the other resonance capacitor C5
B is directly connected to the load circuit LC by being connected in parallel to the fluorescent lamp F without using a filament.

Thus, the pair of resonant capacitors C5A and C5B are configured so that the load circuit LC resonates in series with the current-limiting inductor L2 with respect to the combined capacitance connected in parallel with each other.

Next, the circuit operation will be described.

When the low-frequency AC power supply AS is turned on, a DC voltage smoothed by the rectified DC power supply RD is obtained.
Then, a DC voltage is applied between both drains of the first and second switching means Q1 and Q2 connected in series. However, the first and first switching means Q1,
Q2 is in the off state because the gate voltage in the drive direction is not applied between the gate and the source.

Since the DC voltage is simultaneously applied to the starting circuit ST, both ends of the resistor R2 are mainly connected to the resistor R2.
A voltage appears in accordance with a proportional ratio of the resistance values of 1, R2, and R3. The terminal voltage of the resistor R2 is applied as a drive voltage between the gate and the source of the first switching means Q1 via the feedback means FB. As a result, the first switching means Q1 is turned on because it is set to exceed the threshold voltage.

On the other hand, the second switching means Q
The voltage applied between the gate and the source of the second transistor has the polarity opposite to the drive direction, and thus remains off.

When the first switching means Q1 is turned on, the load circuit LC, that is, the current limiting inductor L2, the DC cutoff, is connected between the positive electrode of the rectified DC power supply RD and the drain and source of the first switching means Q1. A current flows through the negative electrode path of the rectified DC power supply RD through the capacitor C4 and the resonance capacitors C5A and C5B. At this time, the current-limiting inductor L2 of the load circuit LC, the DC cut capacitor C4, and the resonance capacitors C5A and C5B resonate in series, so that the terminal voltages of the resonance capacitors C5A and C5B increase and are charged. However, since the DC cut capacitor C4 has a large capacitance, the resonance capacitors C5A and C5B mainly resonate with the current limiting inductor L2.

On the other hand, when the current flows through the current limiting inductor L2, the feedback means FB magnetically coupled to the current
In the figure, a terminal having a polarity symbol attached to the feedback means FB induces a high polarity voltage. At this time, the current limiting inductor L2
Is higher at the terminal with the polarity symbol in the figure.

When a voltage induced in the feedback means FB is applied to the LC resonance circuit RC, the LC resonance circuit RC resonates. Due to this resonance, the terminal voltage of the capacitor C2 increases, and is applied as a voltage in the drive direction between the gate and the source of Q1 via the gate voltage output means GV, so that the first switching means Q1 remains on.

On the other hand, the second switching means Q
The above voltage is also applied between the gate and the source of No. 2, but since the polarity is opposite to the drive direction, the voltage is still off.

However, the polarity of the resonance voltage of the LC resonance circuit RC is inverted next due to the vibration caused by the resonance.
At that time, the gate of the first switching means Q1 is turned off due to the reverse voltage, and conversely, the gate of the second switching means Q2 is turned on with the polarity in the drive direction.

Therefore, the first switching means Q1
Is determined by the inductance of the inductor L1 of the LC resonance circuit RC and the capacitance of the capacitor C2.

When the first switching means Q1 is turned off, the electromagnetic energy stored in the current limiting inductor L2 is released, and the direct current cut capacitor C4, a pair of resonance capacitors C5A, C5B,
The current continues to flow through the path of the parasitic diode of the second switching means Q2 and the current-limiting inductor L2, but when the current becomes zero, the resonance capacitor C5
A and C5B are charged DC cut capacitors C
4. Current limiting inductor L2, second switching means Q2
And discharge the path of the resonance capacitors C5A and C5B,
Current flows in the opposite direction. At this time, the voltage induced in the feedback means FB magnetically coupled to the current limiting inductor L2 is lower at the terminal to which the polarity symbol is attached in the figure and higher at the other terminal. The first switching means Q1 to which the resonance voltage is applied maintains the off state, and the second switching means Q2 maintains the on state.

However, when the resonance voltage of the LC resonance circuit RC oscillates and the polarity is reversed, the first switching means Q1 is turned on again, and the second switching means Q2 is turned off.

As a result, again from the rectified DC power supply RD,
A current flows through the load circuit LC as described first. Hereinafter, the operation described above is repeated to operate as a half-bridge type inverter.

When the high-frequency current of the half-bridge type inverter flows through the load circuit LC, the resonance capacitor C5
Since the current flowing through A also flows through the pair of electrodes 1b of the fluorescent lamp FL, the filament is heated and the electrode 1b enters a thermionic emission state, and the voltage applied to the fluorescent lamp FL increases due to series resonance. Fluorescent lamp F
L starts and goes on.

Note that, in the present embodiment, the lighting circuit 2
Is higher than the resonance frequency of the load circuit LC 70
Since the frequency is set in the range of up to 90 kHz, the fluorescent lamp FL lights up in a slow phase region in a normal state.

Next, a circuit operation when the electrode 1b of the fluorescent lamp FL is disconnected will be described.

If the filament of the electrode 1b is disconnected for some reason while the fluorescent lamp FL is lit, the resonance capacitor C5A is released from the load circuit LC, so that the resonance frequency of the load circuit LC increases, and therefore the lighting circuit Since the operating frequency is much lower than the resonance frequency, the terminal voltage of the resonance capacitor C5B remaining in the load circuit LC decreases, and the fluorescent lamp FL cannot sustain discharge,
Turns off. Therefore, it is possible to prevent the fluorescent lamp FL from being abnormally discharged due to the disconnection of the filament.
At this time, the first and second switching means Q1, Q
2 switches in the fast phase region, but there is no problem because the fluorescent lamp 1 is turned off.

FIG. 7 shows a second embodiment of the compact fluorescent lamp of the present invention.
It is a top view showing mounting arrangement of switching means in an embodiment.

In the figure, the same parts as those in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted.

In this embodiment, a pair of switching means Q
1. The arrangement of Q2 is different.

That is, the second switching means Q is attached to the mold package portion p of the first switching means Q1.
The two sides are opposed to each other, and are arranged at right angles.

Thus, even if the first and second switching means Q1 and Q2 fall down for some reason, it is possible to prevent the two drains D from contacting each other and causing a short circuit.

FIG. 8 shows a third embodiment of the compact fluorescent lamp of the present invention.
It is a side view which shows the mounting arrangement | positioning of the switching means in embodiment.

In the figure, the same parts as those in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted.

In this embodiment, a pair of switching means Q
1. The arrangement of Q2 is different.

That is, the second switching means Q is attached to the mold package portion p of the first switching means Q1.
The two drains D are opposed to each other and are arranged so as to overlap in the same direction.

Also in the present embodiment, even if the first and second switching means Q1 and Q2 fall down for some reason, it is possible to prevent the two drains D from coming into contact and short-circuiting.

FIG. 9 shows a fourth embodiment of the compact fluorescent lamp of the present invention.
It is a side view which shows the mounting arrangement | positioning of the switching means in embodiment.

In the figure, the same parts as those in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted.

In this embodiment, a pair of switching means Q
1. The arrangement of Q2 is different.

That is, the mold package portion p of the first switching means Q1 and the second switching means Q
The two mold package portions p face each other and are arranged so as to overlap each other.

Also in the present embodiment, even if the first and second switching means Q1 and Q2 fall down for some reason, it is possible to prevent the two drains D from contacting each other and causing a short circuit.

FIG. 10 is a conceptually enlarged plan view of a principal part of the wiring board for explaining the action of the wire guiding notch of the wiring board in the first embodiment of the bulb-type fluorescent lamp of the present invention.

In the figure, the same parts as those in FIG. 5 are denoted by the same reference numerals, and description thereof will be omitted.

[0177] In the figure, w is an external lead line of the fluorescent lamp.

The notches n2 and n4 for wire guidance are both the center c of the wiring board 2a and the notch n2 for wire guidance.
And a line L1 connecting the first side surfaces of the wrapping pins P2 and P4 on the n4 side and an tangent line L2 of the wiring board 2a on the side surface is formed at an angle α of approximately 90 °.

On the other hand, the second side face on the opposite side is n
2 is substantially parallel to the first side surface. Further, the second side surface of n4 forms an angle of less than 90 ° with the first side surface, such as two adjacent sides of a triangle.

Thus, when the external introduction line w is guided along the wire guiding notches n2 and n4 from below the wiring board 2a and wrapped on the wrapping pins P2 and P4, the external introduction line w is cut by the wire guiding notch. It is not possible to separate from n2 and n4.

Therefore, it is possible to prevent a problem that the external lead wire w is detached from the wire guiding notches n2 and n4 and comes into contact with the circuit components.

FIG. 11 is a conceptually enlarged plan view of a principal part of a wiring board for explaining the action of a notch for guiding a wire of the wiring board in a fifth embodiment of the bulb-type fluorescent lamp of the present invention.

In the figure, the same parts as those in FIG. 10 are denoted by the same reference numerals, and description thereof will be omitted.

In this embodiment, the wiring board 2a has a rectangular shape, and the angle formed between the side surface of the wire guiding notches n2 'and n4' on the wrapping pin side and the peripheral edge of the wiring board n2a is less than 90 °. Is different.

However, the wire guiding notches n2 'and n4'
Is basically the same as that of FIG.

[0186]

According to the first aspect of the present invention, there is provided a light-transmitting discharge in which a bent discharge path is formed in a compact shape so as to be formed therein, and a phosphor layer is disposed on the inner surface side. A fluorescent lamp in which a pair of electrodes are sealed at both ends of a container and an ionization medium containing mercury and a rare gas is sealed therein;
A lighting circuit mounted on a wiring board of 5 to 42 mm for high frequency lighting of a fluorescent lamp, a cover for housing the lighting circuit inside, and a base, and having a rated power consumption of 20 to 25 W, provide high light output. However, a compact compact fluorescent lamp can be provided.

According to the second aspect of the present invention, there is provided a light-transmitting discharge vessel having a compact shape such that a bent discharge path is formed therein and having a phosphor layer provided on an inner surface side. A fluorescent lamp in which a pair of electrodes are sealed at both ends and an ionizing medium containing mercury and a rare gas is sealed inside, and a lighting device mounted on a wiring board having an area of 50 to 60 mm ² per 1 W of rated power consumption to light the fluorescent lamp at high frequency. A compact light-bulb-shaped fluorescent lamp having high light output while having a circuit, a cover for accommodating a lighting circuit therein, and a base and having a rated power consumption of 20 to 25 W can be provided.

According to the third aspect of the present invention, in addition to the first and second aspects, the operating frequency is 70 kHz or more, so that it is possible to provide a compact fluorescent lamp which can be easily downsized.

According to the fourth aspect of the present invention, in addition, since the wiring substrate is substantially circular, it is possible to provide a compact fluorescent lamp which has a large mounting area and is easily miniaturized.

According to the fifth aspect of the present invention, in addition, the lighting circuit includes a pair of drain-exposed molded package MOSFETs which are arranged adjacent to each other in an upright state so that the drains do not come into contact with each other when they fall down and are mounted on the wiring board. By including the same, it is possible to provide a compact fluorescent lamp that can be easily miniaturized with a high mounting density.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional front view showing a first embodiment of a bulb-type fluorescent lamp of the present invention.

FIG. 2 is a plan view of the same glove.

FIG. 3 is an exploded perspective view of the same.

FIG. 4 is a plan view showing a state where the lighting circuit is mounted on a wiring board.

FIG. 5 is a plan view showing the same wiring board.

FIG. 6 is a circuit diagram showing a lighting circuit of the bulb-type fluorescent lamp according to the first embodiment of the present invention.

FIG. 7 is a plan view showing a mounting arrangement of switching means in a bulb-type fluorescent lamp according to a second embodiment of the present invention.

FIG. 8 is a side view showing a mounting arrangement of switching means in a third embodiment of the bulb-type fluorescent lamp of the present invention.

FIG. 9 is a side view showing a mounting arrangement of switching means in a fourth embodiment of the bulb-type fluorescent lamp of the present invention.

FIG. 10 is a conceptual enlarged plan view of a principal part of the wiring board for explaining the action of the wire guiding notch of the wiring board in the first embodiment of the bulb-type fluorescent lamp of the present invention.

FIG. 11 is a conceptual enlarged plan view of a principal part of a wiring board for explaining the function of a notch for guiding a wire of the wiring board in a fifth embodiment of the bulb-type fluorescent lamp of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Fluorescent lamp 1a ... Translucent discharge container 1a1 ... U-shaped glass tube 1a2 ... Connecting tube 1a3 ... Seal part 1a4 ... Thin tube 1b ... Electrode 2 ... Lighting circuit 2a ... Wiring board 2b ... Circuit components C1 ... Smoothing capacitor 3 ... Cover 3a ... Basic end 3b ... Top end 4 ... Base 5 ... Glove AJ ... Envelope A ... Emitting room B ... Lighting circuit housing room 6 ... Partition plate 6a ... Cylinder 6a1 ... Top surface 6b ... Flange

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shinya Shirata F-term in Toshiba Litec Co., Ltd. 3-3-1 Higashishinagawa, Shinagawa-ku, Tokyo 3K072 AA02 AA06 BA03 BB01 BC01 BC03 DB03 DD04 GA03 GB12 GC02 5C043 AA12 CC09 CD06 CD10 DD39 EA01 EC20

Claims (5)

[Claims] A light-transmitting discharge vessel formed in a compact shape such that a bent discharge path is formed therein; a phosphor layer disposed on an inner surface side of the light-transmitting discharge vessel; A fluorescent lamp including a pair of electrodes sealed at both ends of a light-emitting discharge vessel, and an ionizing medium containing mercury and a rare gas sealed in the light-transmitting discharge vessel;
a lighting circuit mounted on a wiring board having a thickness of 2 mm and lighting the fluorescent lamp at a high frequency; a cover accommodating the lighting circuit therein and supporting the fluorescent lamp; and a base provided at a base end of the cover. And a bulb-shaped fluorescent lamp having a rated power consumption of 20 to 25 W. 2. A light-transmitting discharge vessel formed in a compact shape such that a bent discharge path is formed therein, a phosphor layer disposed on the inner surface side of the light-transmitting discharge vessel, A fluorescent lamp including a pair of electrodes sealed at both ends of a light-emitting discharge vessel, and an ionizing medium containing mercury and a rare gas sealed in the light-transmitting discharge vessel; A lighting circuit mounted on a wiring board of 50 to 60 mm ² per watt for lighting a fluorescent lamp at a high frequency; a cover accommodating the lighting circuit therein and supporting the fluorescent lamp; a base provided at a base end of the cover And a rated power consumption of 20 to 25 W. 3. The compact fluorescent lamp according to claim 1, wherein the lighting circuit has an operating frequency of 70 kHz or more. 4. The bulb-type fluorescent lamp according to claim 1, wherein the wiring board is substantially circular. 5. The lighting circuit includes a pair of drain-exposed molded package MOSFETs which are disposed adjacent to each other in a standing state so as to prevent the drain from coming into contact with the wiring board when falling down, and which are DIP-mounted on the wiring board. The bulb-type fluorescent lamp according to any one of claims 1 to 4, wherein: