JPH1167149A - Compact self-ballasted fluorescent lamp and luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact self-ballasted fluorescent lamp which has almost the same shape as a general illumination lamp, such as an incandescent lamp by making a diameter dimension small in the neighborhood of a base. SOLUTION: A lighting circuit 16 is contained inside a cover 14 provided with a base. A large circuit board 24 of the lighting circuit 16 is formed inside the cover 14 and arranged opposite to an end part of an arc tube 18. Electrical components 25, 26 are arranged on both sides of the circuit board 24. An electrical component 26 in a chip shape is arranged on the side of the arc tube 18 of the circuit board 24. This electrical component 26 is arranged with a shift in location from an end part of the arc tube 18 and a slender tube 41. In addition, this electrical component 26 is arranged at a position away from an electrode of the arc tube 18.

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 cover having a base mountable to a socket of a general lighting bulb such as an incandescent lamp is provided, and a lighting circuit is housed inside the cover.
A bulb-type fluorescent lamp in which an arc tube is bent and stored in a glove is known.

[0003] Such a bulb-type fluorescent lamp is formed in an outer shape larger than that of a general lighting bulb, so that further miniaturization is desired. However, when the compact fluorescent lamp is miniaturized, there is a concern that a lighting circuit housed inside the cover may have a thermal influence from the arc tube. Therefore, for example, a configuration is known in which a circuit board for mounting components of a lighting circuit is disposed at a position avoiding an electrode side end of a light emitting tube, such as a fluorescent lamp described in Japanese Patent Application Laid-Open No. 8-273615. ing. However, with the miniaturization of the bulb-type fluorescent lamp, the circuit board is also miniaturized, so that there is a problem that the mounting space for components is reduced.

Further, for example, Japanese Patent Application Laid-Open No. 63-245803
As described in Japanese Patent Application Laid-Open Publication No. H10-209, there is known a configuration in which a circuit board is arranged to face an end of an arc tube, and electric components are arranged on both surfaces of the circuit board. In this configuration, the horizontal position between the end of the arc tube and the circuit board is shifted,
The planar shape at the position of the cover can be reduced.

[0005]

As described above, in the bulb-type fluorescent lamp described in Japanese Patent Application Laid-Open No. 63-245803, a circuit board is arranged opposite to an end of an arc tube. With the configuration in which the electric components are arranged on both sides of the arc tube, the planar shape at the cover position can be reduced compared to the configuration in which the horizontal position between the end of the arc tube and the circuit board is shifted, but particularly at the end of the arc tube In addition, since the electric component interferes with the arc tube, there is a problem that the thermal effect on the electric component is increased and the length of the lamp including the base is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a bulb-type fluorescent lamp and a lighting apparatus capable of reducing the diameter of a portion in the vicinity of a base and shortening the lamp length including the base. I do.

[0007]

According to a first aspect of the present invention, there is provided a bulb-type fluorescent lamp comprising: an arc tube; a cover having a base; a circuit board housed in the cover and facing an end of the arc tube; Mounted on both sides, and on the side facing the arc tube,
A lighting circuit including an end of the arc tube and electric components arranged at a shifted position.

In this configuration, the circuit board is opposed to the end of the arc tube, and electrical components are mounted on both sides of the circuit board, so that the circuit board can be downsized. Becomes possible. Furthermore, on the surface facing the arc tube, by disposing the electric component at a position shifted from the end of the arc tube, the arc tube does not interfere with the electric component, thermal effects are suppressed, and the length of the lamp including the base is reduced. Shortening is possible.

A bulb-type fluorescent lamp according to a second aspect of the present invention is: a light emitting tube; a cover having a base; a circuit board housed in the cover and facing an end of the light emitting tube; and mounted on both sides of the circuit board; And a lighting circuit having a thin tube of the arc tube and electric components arranged at a shifted position on the surface facing the arc tube.

In this configuration, the circuit board is opposed to the end of the arc tube, and electrical components are mounted on both sides of the circuit board, so that the circuit board can be downsized. Becomes possible. Furthermore, on the surface facing the arc tube, by disposing the electric components at a position shifted from the thin tube of the arc tube, the thin tubes further projecting from the arc tube do not interfere with the electric components, the thermal effect is suppressed, and the base is closed. Including the lamp length can be shortened.

A bulb-type fluorescent lamp according to a third aspect of the present invention includes: a light emitting tube; a cover having a base; a circuit board housed in the cover and facing an end of the light emitting tube; Components, a relatively small electric component is arranged near the thin tube of the arc tube on the surface facing the arc tube, and a relatively large electric component is arranged at a position separated from the thin tube of the arc tube. A lighting circuit;

In this configuration, the circuit board is opposed to the end of the arc tube, and electrical components are mounted on both sides of the circuit board, so that the circuit board can be downsized. Becomes possible. Furthermore, a relatively small electric component is arranged near the thin tube of the arc tube on the surface facing the arc tube, and a relatively large electric component is arranged at a position separated from the thin tube of the arc tube. The space on the side facing the arc tube can be effectively used without interfering with the electric components, and the mounting density of the electric components increases, so that the compact fluorescent lamp can be further reduced in size. .

According to a fourth aspect of the present invention, there is provided the bulb-type fluorescent lamp according to any one of the first to third aspects, wherein the electric component disposed on the surface facing the arc tube is separated from the electrode of the arc tube. It is arranged on the side.

With this configuration, the thermal effect on the electric components due to the heat generated from the electrodes is suppressed.

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 at least a switching element among the electric components arranged on the surface facing the arc tube is the arc tube. Are disposed at positions close to the electrodes.

In this configuration, among the electrical components arranged on the surface facing the arc tube, at least the switching element is arranged at a position close to the electrode of the arc tube, so that the thermal effect of the electric components is suppressed. In addition, at the end of the lamp life, the electrodes of the arc tube generate excessive heat, so that the switching element is destroyed by the influence of the heat generation and the operation of the lighting circuit is stopped. The switching element includes an element such as a transistor, an FET, and an IGBT.

According to a sixth aspect of the present invention, there is provided a bulb-type fluorescent lamp according to any one of the first to fifth aspects, wherein the outer diameter of the circuit board is substantially equal to the inner diameter of the cover. is there.

In this configuration, parts can be arranged by making maximum use of the storage space in the cover,
The diameter near the base can be reduced.

According to a seventh aspect of the present invention, there is provided a lighting apparatus including the bulb-type fluorescent lamp according to any one of the first to sixth aspects.

In this configuration, the diameter of the portion near the base of the bulb-type fluorescent lamp can be reduced, and the length of the lamp including the base can be shortened. Therefore, it is possible to use a general lighting bulb socket without a sense of incongruity. Thus, the cost is reduced and the appearance is improved.

[0021]

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 4 show a first embodiment, FIG. 1 is a cross-sectional view of a part of a bulb-shaped fluorescent lamp, FIG. 2 is a side view of a globe of the bulb-shaped fluorescent lamp, and FIG. FIG. 4 is an exploded perspective view of a part of the bulb-type fluorescent lamp, and FIG. 4 is an explanatory view seen from the bottom of the bulb-type fluorescent lamp.

1 to 4, 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 constituted by the globe 17 and the cover 14 is formed to have an outer shape that is close to the standard size of a general lighting bulb such as an incandescent bulb having a rated power of 60 W, for example. That is, base 12
Is about 110 to 125 mm, the diameter, ie, the outer shape D1 of the globe 17 is about 50 to 60 mm, and the cover 14 has
Has a maximum diameter D2 of about 40 mm. Hereinafter, the description will be made with the base 12 side being the upper side and the glove 17 side being the lower side.

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

The globe 17 is made of a transparent or light-diffusing milky white or the like, and is formed of glass or synthetic resin into a smooth curved surface having substantially the same shape as a glass bulb of a general lighting bulb such as an incandescent bulb. At the same time, 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, or can be omitted.

The lighting circuit 16 housed in the cover 14
Is provided with a circuit board (PC board) 24 arranged horizontally, that is, perpendicular to the longitudinal direction of the arc tube 18, and on both sides of the circuit board 24, that is, on the upper surface on the base 12 side and on the lower surface on the arc tube 18 side A plurality of electrical components 25 and 26 are mounted to constitute an inverter circuit (high-frequency lighting circuit) that performs high-frequency lighting. Further, on the upper surface of the circuit board 24, electric components 25 such as an electrolytic capacitor and a film capacitor, which are relatively weak to heat (relatively low in heat resistance), are arranged.
On the lower surface, a chip-shaped electric component (chip component) 26 which is relatively resistant to heat (has relatively high heat resistance) and has a small height is arranged. The chip-shaped electric component 26 is a REC (rectifier, diode bridge), transistor, resistor, or the like, and the thickness of the package is formed to be about 2 mm to 3 mm. The circuit board 24 has a substantially disk shape and a diameter dimension smaller than a substantially circle of about 40 mm. The wire led out of the circuit board 24 is connected to the electrode 28 of the arc tube 18.

In the luminous tube 18, three tubes 31 having substantially the same shape are arranged at predetermined positions, and are sequentially connected by a communication tube 32 to form one discharge path. An electrode 28 having a filament coil or the like is provided at an end of the discharge path. Each tube 31 has a phosphor film formed on the inner surface and a rare gas such as argon and mercury sealed inside. And each tube 31
This is a glass cylindrical valve with a tube outer diameter of about 8 to 11 mm, a pipe inner diameter of about 6 to 9 mm, and a wall thickness of about 0.7 to 1.0 mm. And is formed into a substantially U-shape having a top P which is smoothly curved. That is, each pipe body 31 has a bent portion that smoothly reverses.
31a and a pair of straight pipe portions 31b parallel to each other and continuing to the bent portion 31a. The arc tube 18 has a lamp height of about 50 to 60 mm and a discharge path length of 200 to 300 mm.
mm, and the maximum width in the valve juxtaposition direction is about 32 to 43 mm.

The luminous tube 18 is attached to a partition plate 33 as a support means, 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 tube 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. And this mating step
35 is fitted to the inside of the cover 14, and furthermore, this fitting step 35
By filling the adhesive 37 between the fitting step 35 and the cover 14 while the fitting edge 17a of the glove 17 is fitted between the cover and the cover 14, these members are fixed to each other. ing. A mounting piece 38 having a cylindrical shape or the like is protruded above the fitting step 35, and the circuit board 24 of the lighting circuit 16 is attached to the mounting piece 38 by fitting or bonding. Have been.

Each tube 31 has one end sealed by a line seal using a mount or a pinch seal without using a mount, and a thin tube 41 also called an exhaust pipe at the other end. Welded, exhausted,
Alternatively, amalgam is provided as needed. The electrodes 28 formed at the ends of the respective tubes 31 located at both ends of the discharge path of the arc tube 18 are arranged such that a filament coil is supported by a pair of wells (introduction lines). Each well is connected to a lamp-side wire led out of the tube 31 via a dumet wire sealed to glass at an end of the tube 31, and this lamp-side wire is connected to a lighting circuit. It is electrically connected. Note that one of the wells is provided with an auxiliary amalgam as needed.

With the bulb-type fluorescent lamp 10 assembled in this way, as shown in FIG. 4, a circuit is applied to each end of the tube 31 of the arc tube 18, particularly to the projecting thin tube 41. The chip-shaped electric components 26 on the lower surface of the substrate 24 are arranged at shifted positions, and these electric components 26 are located at a position away from the electrodes 28, that is, a tubular body 31 not provided with the electrodes 28.
Are arranged in the vicinity.

Further, with the bulb-type fluorescent lamp 10 assembled in this manner, the arc tube 18 is housed at a predetermined position in the globe 17. That is, in this state, the tops P of the respective tubes 31 are positioned at equal intervals on one circumference centered on a central axis whose longitudinal direction is the vertical direction of the bulb-shaped fluorescent lamp 10, and The straight pipe portions 31b of the tube body 31 are also arranged at substantially equal intervals on a predetermined circumference centered on the central axis of the lamp. Further, each straight pipe portion 31b is formed such that the distance between the adjacent straight pipe portions 31b in the circumferential direction is smaller than the outer diameter of the pipe body 31.

The bulb-shaped fluorescent lamp 10 thus configured has an input power rating of 14 W and the arc tube 18 has 1 bulb.
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.

According to this embodiment, the circuit board
By mounting the electric components 25 and 26 on both sides of the circuit board 24, the circuit board 24 can be miniaturized and the cover 14
Can be reduced in diameter.

The outer diameter of the circuit board 24 is
Is formed so as to cover the inside of the cover 14 so as to maximize the storage space in the cover 14 and reduce the diameter of the portion near the base 12.

In this state, the circuit board 24 and the arc tube 18 are arranged so that the planar positions thereof overlap each other.
On the surface of the circuit board 24 facing the arc tube 18, the chip-shaped electric component 26 is arranged at a position shifted from the end of the arc tube 18, particularly the projecting thin tube 41, so that the electric component 26
Interference can be prevented, thermal effects can be suppressed,
The lamp length H can be further reduced by 2 to 3 mm, which is the thickness of the chip-shaped electric component 26.

Further, the electric component 26 arranged on the surface of the circuit board 24 facing the arc tube 18 is arranged on the side of the arc tube 18 away from the electrode 28, so that the electric component 26 is generated by the heat generated from the electrode 28. Can suppress the thermal effect and improve the reliability.

Further, since the arc tube 18 is constituted by juxtaposed substantially U-shaped tubes 31, the lamp length H can be reduced.

In this manner, a portion near the base 12, for example, a portion 30 mm from the vicinity of the base 12, is reduced in diameter to approximate a so-called general PS-type bulb size, and the lamp length H is shortened. A lamp shape equivalent to a general lighting bulb can be realized. Therefore, this compact fluorescent lamp 10
Can be widely mounted on lighting equipment for general lighting bulbs such as incandescent light bulbs, so that versatility can be improved, and uncomfortable feeling at the time of mounting can be eliminated, and the appearance can be improved.

Next, FIG. 5 shows a second embodiment, and FIG. 5 is a sectional view of a part of a bulb-type fluorescent lamp.

An electric component 26 such as a chip-shaped REC (rectifying element, diode bridge), a transistor or a resistor is mounted on the surface of the circuit board 24 facing the arc tube 18, and is opposite to the arc tube 18 of the circuit board 24. Are mounted with electrical components 25 such as an electrolytic capacitor and a film capacitor.

Of the electric components 26 mounted on the surface of the circuit board 24 facing the arc tube 18, an electric component 26 a such as a relatively small capacitor chip is located at a position facing or near the thin tube 41 of the arc tube 18. The electric component 26b which is larger than the electric component 26a (relatively large) is displaced at a position away from the thin tube 41 of the arc tube 18.

A relatively small electric component 26a is placed near the thin tube 41 of the arc tube 18 on the surface facing the arc tube 18.
Relatively large electric parts 26
b, the arc tube 18 is
The space on the side facing the arc tube 18 can be effectively used without interfering with the electric components 26a and 26b.
, 26b, the light bulb-shaped fluorescent lamp 1
Further miniaturization of 0 becomes possible.

Next, FIG. 6 shows a third embodiment, and FIG. 6 is a sectional view of a part of a bulb-type fluorescent lamp.

The circuit board 24 includes an inverter circuit, and has electric components 26 disposed on a surface facing the arc tube 18.
Of the electric components 26 arranged at a position shifted from the thin tube 41 of the arc tube 18, the thin tube at the end provided with the electrode 28 of the arc tube 18
An FET (field effect transistor) 26c as an oscillation switching element of the inverter circuit is arranged at a position close to 41.

As the electric component 26 disposed on the surface of the circuit board 24 facing the arc tube, one having relatively high heat resistance is used, but the electric component 26 is connected to the thin tube 41 at the end provided with the electrode 28 of the arc tube 18. By arranging the FET 26c at a close position, the electrode 28 of the arc tube 18 excessively generates heat at the end of the lamp life. it can.

The switching elements include elements such as transistors, FETs and IGBTs.

In the above embodiment, the arc tube 18 is formed by connecting three U-shaped tubes 31. However, the shape of the arc tube 18 is not limited to this. Two, three, or four H-shaped tubes are juxtaposed, that is, a four-, six-, or eight-axis discharge path is formed along the longitudinal direction to reduce the lamp length H. You can also plan.

Although the lighting circuit 16 has one circuit board 24 arranged horizontally, a plurality of circuit boards may be provided.

The bulb-type fluorescent lamp 10 having the above-described configuration is used.
Is mounted on a fixture body provided with a socket for a general lighting bulb such as an incandescent bulb, thereby forming a lighting fixture.
Then, with this configuration, a lighting fixture having the effects of the above-described bulb-type fluorescent lamp 10 can be configured.

Each of the above structures can also be applied to a curved tube-type fluorescent lamp provided in a ball-type fluorescent lamp or the like.

[0051]

According to the bulb-type fluorescent lamp of the first aspect, the circuit board can be miniaturized by making the circuit board face the end of the arc tube and mounting electric components on both sides of the circuit board. The diameter near the base can be reduced. Furthermore, on the surface facing the arc tube, by disposing the electric component at a position shifted from the end of the arc tube, interference with the electric component of the arc tube can be prevented, and the thermal effect can be suppressed.
The lamp length including the base can be shortened.

According to the bulb-type fluorescent lamp of the second aspect, the circuit board is opposed to the end of the arc tube and the electric parts are mounted on both sides of the circuit board, so that the circuit board can be downsized. The diameter of the vicinity can be reduced. Furthermore, on the surface facing the arc tube, by disposing the electric component at a position shifted from the thin tube of the arc tube, it is possible to prevent interference of the thin tube protruding further from the arc tube with the electric component and to suppress the thermal effect. The lamp length including the base can be shortened.

According to the third aspect of the present invention, the circuit board is opposed to the end of the arc tube, and the electric parts are mounted on both sides of the circuit board. The diameter of the vicinity can be reduced. Furthermore, a relatively small electric component is arranged near the thin tube of the arc tube on the surface facing the arc tube, and a relatively large electric component is arranged at a position separated from the thin tube of the arc tube. The space on the side facing the arc tube can be effectively used without interfering with the electric components, and the mounting density of the electric components is increased, so that the compact fluorescent lamp can be further miniaturized.

According to the bulb-type fluorescent lamp of the fourth aspect, in addition to the effect of any one of the first to third aspects, the electric component disposed on the surface facing the arc tube is separated from the electrode of the arc tube. By arranging it on the side, it is possible to suppress the thermal influence on the electrical components due to the heat generated from the electrodes.

According to the bulb-type fluorescent lamp of the fifth aspect, in addition to the effects of any one of the first to fourth aspects, at least the switching element among the electric components arranged on the surface facing the arc tube is replaced with the arc tube. In addition to suppressing the thermal effects of electrical components by arranging them close to the electrodes, the electrodes of the arc tube generate excessive heat at the end of the lamp life. Is destroyed and the operation of the lighting circuit can be stopped.

According to the bulb-type fluorescent lamp of the sixth aspect, in addition to the effect of any one of the first to fifth aspects, by forming the outer diameter of the circuit board substantially equal to the inner diameter of the cover, Parts can be arranged by maximizing the storage space in the cover, and the diameter in the vicinity of the base can be reduced.

According to the lighting apparatus of the present invention, since the light bulb-shaped fluorescent lamp according to any one of the first to sixth aspects is provided, the diameter of the bulb-shaped fluorescent lamp near the base is reduced, and the lamp length including the base is provided. This makes it possible to use a general lighting bulb socket without a sense of incongruity, thereby reducing costs and improving the appearance.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a part of a bulb-type fluorescent lamp according to a first embodiment of the present invention.

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

FIG. 3 is an exploded perspective view of a part of the bulb-type fluorescent lamp;

FIG. 4 is an explanatory diagram viewed from a bottom surface of the bulb-type fluorescent lamp.

FIG. 5 is a cross-sectional view of a part of a light bulb-shaped fluorescent lamp showing a second embodiment of the present invention.

FIG. 6 is a cross-sectional view of a part of a bulb-type fluorescent lamp showing a third embodiment of the present invention.

[Explanation of symbols]

 10 Bulb-type fluorescent lamp 12 Cap 14 Cover 16 Lighting circuit 18 Arc tube 24 Circuit board 25, 26 Electrical components 26a Relatively small electrical components 26b Relatively large electrical components 26c FET as a switching element 28 Electrode 41 Thin tube

Claims (7)

[Claims] An arc tube; a cover having a base; a circuit board housed in the cover and facing an end of the arc tube; and a light emitting surface mounted on both sides of the circuit board and facing the arc tube. A lighting circuit comprising: an end part of a tube; and an electric component disposed at a position shifted from the end part of the tube. An arc tube; a cover having a base; a circuit board housed in the cover and facing an end of the arc tube; and a light emitting surface mounted on both sides of the circuit board and facing the arc tube. A lighting circuit comprising: a thin tube of a tube; and an electric component arranged at a shifted position. An arc tube; a cover having a base; a circuit board housed in the cover and facing an end of the arc tube; and electric components mounted on both sides of the circuit board. A lighting circuit in which a relatively small electric component is disposed near the thin tube of the arc tube on the surface, and a relatively large electric component is disposed at a position spaced apart from the thin tube of the arc tube. A light bulb-type fluorescent lamp, characterized in that: 4. The bulb-type fluorescent lamp according to claim 1, wherein the electric component disposed on the surface facing the arc tube is arranged on a side of the arc tube that is separated from the electrode. . 5. An electric component arranged on a surface facing an arc tube, wherein at least a switching element is arranged at a position close to an electrode of the arc tube. Light bulb shaped fluorescent lamp. 6. The light bulb-shaped fluorescent lamp according to claim 1, wherein an outer diameter of the circuit board is substantially equal to an inner diameter of the cover. 7. A lighting fixture comprising the light bulb-shaped fluorescent lamp according to any one of claims 1 to 6.