JP2004303662A - Compact self-ballasted fluorescent lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact self-ballasted fluorescent lamp wherein thermal effect on an electronic components is suppressed by at least lessening influence of heat radiated from a connecting pin, and an inverter circuit can be miniaturized. <P>SOLUTION: This compact self-ballasted fluorescent lamp 1 has a discharge lamp 8; and a circuit board 14 to which a connecting pin 16 connected to a lead wire 18 derived from the discharge lamp 8, and electronic components 13 composing a high frequency lighting circuit to light the discharge lamp 8 are mounted, and is equipped with an inverter circuit 6 in which the connecting pin 16 is provided on one surface on the side facing the discharge lamp 8 of the circuit board 14; a cover 4 storing the inverter circuit 5 while supporting the discharge lamp 8; and a base 2 attached to the cover 4. Since the connecting pin 16 is provided on one surface of the circuit board 14 where too many electronic components 13 of the inverter circuit 6 are not mounted, the connecting pin 16 can be efficiently disposed on the circuit board 14, and the inverter circuit 6 can be miniaturized. In addition, it is prevented to thermally influence the electronic components 13 mounted on the other surface side, even if the temperature of the connecting pin 16 rises when the lead wire 18 is connected to the electrode of the discharge lamp 8. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bulb-type fluorescent lamp provided with an inverter circuit having a circuit board provided with connection pins connected to lead wires derived from a discharge lamp.
[0002]
[Prior art]
The bulb-type fluorescent lamp has a lighting circuit for lighting the discharge lamp, and since the inverter circuit has been used in this lighting circuit, the compact and high efficiency of the bulb-type fluorescent lamp has been promoted, and the incandescent lamp has been developed. The replacement with a compact fluorescent lamp has been further promoted.
[0003]
However, with the miniaturization of compact fluorescent lamps, the temperature inside the cover tends to increase during lighting, and measures such as improving the heat resistance of the electronic components that make up the inverter circuit, which are easily affected by heat, are taken. Was needed.
[0004]
In order to reduce the thermal effects on the circuit components, mount the high heat-resistant components on one side of the circuit board facing the discharge lamp, and mount the low heat-resistant electronic components on the other side on the opposite side. 2. Description of the Related Art A bulb-type fluorescent lamp including an inverter circuit on which components are mounted is known (for example, see Patent Document 1). In this conventional bulb-type fluorescent lamp, since the heat of the discharge lamp is blocked by the circuit board and the temperature inside the cover on the other side is lower than that on one side, the heat resistance of an electrolytic capacitor etc. By mounting an electronic component having a low temperature, thermal effects on circuit components are suppressed.
[0005]
[Patent Document 1]
JP 2000-173536 A
[Problems to be solved by the invention]
However, miniaturization and high output of the bulb-type fluorescent lamp are further progressing, and it is difficult to sufficiently suppress the thermal effect only by the mounting structure of the electronic component like the above-mentioned conventional bulb-type fluorescent lamp. ing. In particular, the temperature of the connection pins mounted on the circuit board may increase, and it is necessary to prevent the heat radiated from the connection pins from affecting the electronic components. The rise in the temperature of the connection pin is due to the fact that the heat of the discharge lamp is transmitted to the connection pin by heat conduction via a lead wire connected to the connection pin.
[0007]
On the other hand, a connection pin to which a lead wire derived from a discharge lamp of a bulb-shaped fluorescent lamp is connected is mounted on a circuit board, and this connection pin is connected to the other side of the circuit board on which most of the electronic components are mounted. Therefore, it is necessary to reduce the size of the connection pins in order to secure a space for mounting the circuit board on the other side.
[0008]
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a light bulb that can reduce the influence of heat radiated from a connection pin, suppress the heat influence on electronic components, and reduce the size of an inverter circuit. It is an object of the present invention to provide a shaped fluorescent lamp.
[0009]
[Means for Solving the Problems]
The bulb-type fluorescent lamp according to claim 1 includes a discharge lamp; a connection pin connected to a lead wire derived from the discharge lamp; and a circuit board on which electronic components constituting a high-frequency lighting circuit for lighting the discharge lamp are mounted. An inverter circuit provided on one side of the circuit board facing the discharge lamp; a cover supporting the discharge lamp and accommodating the inverter circuit; and a base attached to the cover. It is characterized by doing.
[0010]
In this claim and the following claims, the definitions of terms are as described below.
[0011]
The discharge lamp has an arc tube, is formed by bending a straight tubular bulb, and has at least one discharge path formed therein in parallel to communicate a plurality of U-shaped bent bulbs. In addition to the above, an arc discharge tube of an electrodeless discharge type constituted by a hollow rotating body may be used. In the case of an arc tube in which a discharge path is formed, an electrode for generating a discharge is sealed at an end of the discharge path. Examples of the electrode include a hot cathode composed of a filament, a ceramic electrode carrying an electron-emitting substance, and a cold cathode formed of nickel or the like.
[0012]
The arc tube is preferably made of glass such as lead glass, soda lime glass, borosilicate glass or the like, but other materials such as ceramics may be used as long as they are translucent. In particular, considering the effect on the environment, it is optimal to form with lead-free glass. Lead-free glass is glass that does not substantially contain lead, and may contain lead of an impurity level. For example, Na ₂ O is 0 to 10 mass%, _{K 2} O is 1 to 10 mass%, Li ₂ O 0 to 3 wt% (provided _that the total amount of Na 2 O, _{K 2} O and Li ₂ O 5 -20% by mass) and a glass having a softening temperature of 685 ° C or lower. Glass using K ₂ O and Li ₂ O together with Na ₂ O as a flux has a composition substantially free of lead and can lower the softening temperature to 685 ° C. or lower as compared with conventional soda-lime glass. . By applying such a glass having a low softening point to a glass bulb, the heating temperature at the time of bulb processing can be reduced, and based on the decrease in the heating temperature, thermal degradation of the phosphor layer and, consequently, reduction of the total luminous flux. Can be suppressed. Further, by setting the amount of Na ₂ O to 10% by mass or less, it becomes possible to suppress coloring caused by the Na component in the glass and, consequently, decrease in the luminous flux maintenance factor.
[0013]
A phosphor layer may be directly or indirectly applied to the inner surface of the arc tube of the discharge lamp. As the phosphor, a three-wavelength emission type rare earth metal oxide phosphor, a calcium halophosphate phosphor, or the like can be used. In addition, an inert gas such as argon, neon, or krypton, or a discharge medium such as mercury or xenon gas is sealed inside the arc tube. The arc tube may use a rare gas discharge that does not encapsulate mercury or may have an electrode outside.
[0014]
When mercury is sealed in the arc tube, it is preferable to seal amalgam, but not limited to this. The amalgam may have a characteristic that the vapor pressure is higher than that of pure mercury sealed for efficient lighting even at high temperature, or may be used for quantitatively sealing mercury in the bulb. In particular, when the lamp is turned on, the arc tube becomes hot. Therefore, it is necessary to select an amalgam having a vapor pressure characteristic corresponding to the lighting temperature. Examples of amalgam considering vapor pressure characteristics include bismuth (Bi) -indium (In) -mercury (Hg), bismuth (Bi) -tin (Sn) -lead (Pb) -mercury (Hg), and bismuth (Bi). ) -Indium (In) -Lead (Pb) -Mercury (Hg), but are not limited thereto. Examples of the amalgam for quantitative encapsulation include, but are not limited to, zinc (Zn) -mercury (Hg). In addition, although not amalgam, a pellet in which mercury is supported on a substance such as ceramics may be held in the thin tube.
[0015]
The arc tube can be formed by connecting a plurality of tubular bulbs bent in a U-shape so as to communicate with one discharge path. Therefore, it is allowed to use arc tubes having various shapes such as double U, triple U, and four U. In the case of a double U-shaped arc tube, an electrode is sealed at one end of a U-shaped bulb and the other end is connected to form an electric discharge between the electrodes sealed at each end of the two tubular bulbs. It will be. In the case of a triple U-shaped arc tube, an electrode is sealed at one end of two U-shaped bulbs, and the other end is connected to the end of an intermediate bulb where the electrode is not sealed, thereby forming three tubular bulbs. A discharge is generated between the electrodes sealed at one end of each of the U-shaped bulbs on both sides. In the case of four U, a plurality of U-shaped bent tubular valves can be arranged side by side so as to be parallel to each other. Regardless of the case of double U, triple U, or four U, the place where the thin tube is sealed may be either the end where the electrode is sealed or the end formed by connecting. Further, the sealing of the thin tube may be performed by either a stem seal or a pinch seal.
[0016]
A lead wire for power supply is led out of the discharge lamp, and this lead wire is wound around a connection pin of the inverter circuit and connected by means such as welding or caulking. The lead wire is connected to this electrode when the arc tube is sealed with an electrode, and is connected to an electromagnetic field generating means such as a coil in the case of an electrodeless discharge lamp. It is.
[0017]
The cover directly or indirectly supports the arc tube of the discharge lamp. As means for indirectly supporting the arc tube, it is preferable to mount a holder having a shape capable of attaching the arc tube of the discharge lamp to a portion of the cover opposite to the direction in which the base is attached. This holder may be either integral with or separate from the cover. Further, the holder can have a blocking action so that radiant heat or ultraviolet rays from the arc tube does not reach the inverter circuit inside the cover.
[0018]
The cover has a base, and is configured such that the entire bulb-type fluorescent lamp has a height of 75 to 140 mm including the base. A glove covering the discharge lamp may be attached to the cover. This glove may be light-diffusing or transparent as long as it has light-transmitting properties, and may be patterned or colored. The material of the glove may be either glass or plastic. The shape of the globe is arbitrary, but a so-called A-shape similar to a commonly used incandescent lamp, a so-called G-shape similar to a sphere, and a so-called T-shape with a spherical tip and a cylindrical shape. A so-called shape or the like can be adopted. The overall height of the bulb-type fluorescent lamp when the glove is attached is defined by the height including the glove.
[0019]
The inverter circuit mainly includes an electronic component for applying a high frequency power of 10 kHz or more to the discharge lamp to light the discharge lamp, and the electronic component and the above-described connection pins are mounted on a circuit board. The circuit board is large enough to be disposed inside the cover such that one surface of the circuit board faces the discharge lamp, and has a circular or polygonal shape. In addition, most of the electronic components mounted on the circuit board are mounted on the other surface, which is the surface opposite to the surface facing the discharge lamp, but a part is mounted on one surface of the circuit board. May be.
[0020]
Connection pins are provided on one surface side of the circuit board. The connection pins need to have a relatively large mounting space because it is necessary to secure a space around the connection pins for inserting the wrapping or welding jig during the connection work. There is. Therefore, the connection pins must be efficiently arranged on the circuit board. However, on one side of the circuit board, the electronic components are not mounted much more than on the other side, so that a mounting space is secured. be able to.
[0021]
When the lead wire is connected to the electrode of the discharge lamp, heat of the discharge lamp is conducted to the connection pin via the lead wire, and the temperature of the connection pin may increase. However, since the connection pins are provided on one side of the circuit board, even if the temperature of the connection pins rises, it is possible to prevent the electronic components mounted on the other side from being thermally affected.
[0022]
On one surface side of the circuit board, in addition to the connection pins, an electronic component whose characteristics do not significantly change even when affected by heat from the arc tube may be mounted. For example, winding parts such as a choke ballast and a transformer, a transistor, a diode, a resistor, and the like can be given.
[0023]
As the base, a screw-in type called an E shape is usually used, but the present invention is not limited to this as long as it can be attached to a socket to which an incandescent lamp is mounted. The base does not need to be directly attached to the cover, but may be indirectly attached to the case or a part of the cover may constitute the base.
[0024]
According to the first aspect of the present invention, since the connection pins are provided on one surface of the circuit board on which the electronic components of the inverter circuit are not mounted so much, the connection pins can be efficiently arranged on the circuit board. In addition, the inverter circuit can be downsized. Further, even when the temperature of the connection pin rises when the lead wire is connected to the electrode of the discharge lamp, it is possible to prevent the electronic components mounted on the other surface from being thermally affected.
[0025]
According to a second aspect of the present invention, in the light bulb-shaped fluorescent lamp according to the second aspect, the connection pin protrudes from one surface of the circuit board, and is bent so that its tip is substantially parallel to the one surface of the circuit board. .
[0026]
According to the second aspect of the present invention, since the tip of the connection pin is bent so as to be substantially parallel to one surface of the circuit board, the height dimension of the inverter circuit can be reduced.
[0027]
According to a third aspect of the present invention, in the bulb-type fluorescent lamp according to the first or second aspect, the connection pin is bent so that the tip thereof is directed to the outside of the circuit board, and the lead wire is wound around the connection pin and connected. Features that have.
[0028]
According to the invention of claim 3, when the lead wire is connected to the connection pin, a jig for wrapping or welding can be inserted from the side, for example, in a state where the discharge lamp is temporarily fixed to the cover side. Connection work can be performed.
[0029]
According to a fourth aspect, in the light-bulb-shaped fluorescent lamp according to any one of the first to third aspects, the connection pin is formed by projecting a lead wire of an electronic component mounted on the other surface of the circuit board to one surface side. It is characterized by the following.
[0030]
According to the fourth aspect of the present invention, since the lead wire of the electronic component is formed as a connection pin by protruding to one surface side, no separate connection pin is required, and the number of components can be reduced.
[0031]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, one embodiment of a bulb-type fluorescent lamp of the present invention will be described with reference to the drawings.
[0032]
1 is a partially cutaway side view of a light bulb shaped fluorescent lamp, FIG. 2 is an enlarged exploded side view showing a cover and a base of the light bulb shaped fluorescent lamp, and FIG. 3 is an enlarged perspective view showing an inverter circuit portion. It is.
[0033]
In FIG. 1, is a bulb-type fluorescent lamp, and the bulb-type fluorescent lamp 1 has a cover 4 having a base 2, an inverter circuit 6 as a discharge lamp lighting device housed in the cover 4, and a light-transmitting property. A globe 7 and an arc tube 8 as a discharge lamp housed in the globe 7 are provided. Further, the envelope composed of the base 2, the cover 4 and the globe 7 is formed in an outer shape whose rated power is close to the standard dimensions of a general lighting bulb such as a 60W type or 100W type incandescent bulb. The general lighting bulb is defined in JIS C7501.
[0034]
The cover 4 includes a cover main body 11 formed of a heat-resistant synthetic resin such as polybutylene terephthalate (PBT). The cover main body 11 is formed in a substantially cylindrical shape having an opening that expands downward, and a base 2 such as an Edison type E26 is placed on the upper end and fixed with an adhesive or a caulk. I have.
[0035]
Further, the globe 7 is transparent or milky white having a light diffusing property, and is formed of glass or synthetic resin into a smooth curved surface having substantially the same shape as a glass bulb of a general lighting bulb such as an incandescent bulb. At the edge of the opening of the glove 7, a fitting edge (not shown) that fits inside the lower end opening of the cover 4 is formed. The globe 7 may be combined with another member such as a diffusion film to improve the brightness uniformity or may be omitted.
[0036]
In addition, the inverter circuit 6 includes a circuit board 14 that is arranged horizontally, that is, perpendicular to the longitudinal direction of the arc tube 8. Inverter circuit 6 is a half-bridge inverter in which a pair of complementary N-channel and P-channel MOS field effect transistors (FETs), which are switching elements, are connected in series with electrolytic capacitor 15 in parallel. Is composed.
[0037]
The lighting component 13 is mounted on the circuit board 14. On one surface of the circuit board 14 facing the arc tube 8, a wrapping pin 16 as a connection pin is provided so as to protrude toward the arc tube 8. The tip of the wrapping pin 16 is bent at an angle of about 90 ° in the horizontal direction of the circuit board 14 so as to face outward.
[0038]
On the other surface of the circuit board 14 (the base 2 side), a circuit component 15 such as an electrolytic capacitor which is relatively weak to heat, that is, has relatively low heat resistance is arranged. A chip component 17 such as a rectifier diode chip having relatively high heat resistance is mounted on one surface of the lighting component 13 in addition to the wrapping pin 16.
[0039]
On the inner surface of the arc tube 8, a phosphor layer (not shown) coated with a phosphor is formed. Further, the inside of the arc tube 8 is filled with a filling gas serving as a discharge gas containing a rare gas such as argon or mercury.
[0040]
The arc tube 8 has three tubes of substantially the same shape formed in a substantially U-shape. Both ends of each tube in the middle of these tubes, and one end of each tube at both ends. One continuous discharge path is formed in the arc tube 8 by being sequentially connected via a communication tube portion (not shown) serving as a connection portion.
[0041]
At both ends of the discharge path formed by the arc tube 8, a pair of electrodes (not shown) are sealed, and lead wires 18 are led out of the electrodes. The lead wire 18 is connected by being wound around a wrapping pin of the circuit board 14, and the arc tube 8 and the inverter circuit 6 are electrically connected.
[0042]
The arc tube 8 is attached to a bottomed cylindrical partition plate 31 as a support means, which is a discharge lamp fixing member and a lighting circuit fixing member. Further, the partition plate 31 is fixed to the cover 4. The partition plate 31 includes a disk-shaped substrate portion 32. The end portion of the arc tube 8 is inserted into the substrate portion 32, and the end portion of the arc tube 8 is bonded with an adhesive to form the arc tube 8. It is fixed to the partition plate 31.
[0043]
Then, the partition plate 31 is fitted to the inside of the cover 4, and furthermore, the partition plate 31 and the cover 4 are fitted with the fitting edge of the glove 7 fitted between the partition plate 31 and the cover 4. The partition plate 31 and the cover 4 are fixed to each other by filling an adhesive therebetween. On the upper side of the partition plate 31, a mounting piece 34 is provided in a protruding manner. The circuit board 14 of the lighting circuit 6 is attached to the attachment piece 34 by fitting or bonding.
[0044]
An opening 35 is provided at a position corresponding to the wrapping pin 16 on the side surface of the partition plate 31. A mounting piece 34 is provided to protrude. The circuit board 14 of the lighting circuit 6 is mounted by being fitted to the mounting piece 34, and the partition plate 31 is mounted on the inner surface of the cover body 11 using the mounting piece 34.
[0045]
Next, the operation of the present embodiment will be described. In assembling the bulb-type fluorescent lamp 1, first, the inverter circuit 6 is attached to the partition plate 31, and the inverter circuit 6 and the base 2 are electrically connected by a lead wire or the like, and then the partition plate 31 is attached to the cover body 11. . At this time, the cover body 11 may be filled with an insulating heat radiating material such as a silicone resin in order to enhance the heat radiating action of the inverter circuit 16.
[0046]
Next, with the lead wire 18 of the arc tube 8 being led out of the opening 35 of the partition plate 31, the arc tube 8 is attached to a predetermined mounting hole of the partition plate 31 and fixed. When connecting the lead wire 18 to the wrapping pin 16, a jig for wrapping is inserted from the opening 35, and the lead wire 18 is wound around the wrapping pin 16 for connection. Finally, the globe 7 is attached to the cover 4, and the assembly of the bulb-type fluorescent lamp 1 is completed.
[0047]
In the bulb-type fluorescent lamp 1 of the present embodiment, the wrapping pins 16 are provided on the other surface of the circuit board 14 on which many electronic components 13 are not mounted, so that the mounting space of the circuit board 14 is efficiently used, and the inverter circuit 6 Can be downsized.
[0048]
Further, since the lead wire 18 is connected to the electrode of the arc tube 8, heat of the arc tube 8 is transmitted to the wrapping pin 16 via the lead wire 18, and the temperature of the lapping pin 16 may increase. Since the wrapping pins 16 are provided on one surface side of the circuit board 14, it is possible to prevent the temperature rise of the wrapping pins 16 from thermally affecting mainly the electronic components 13 mounted on the other surface side.
[0049]
Furthermore, since the tip of the wrapping pin 16 is bent so as to be substantially parallel to one surface of the circuit board 14, the height dimension of the inverter circuit 6 can be reduced. Further, since the tip of the wrapping pin 16 is bent so as to face the outside of the circuit board 14, when the lead wire 18 is connected to the wrapping pin 16, the jig for wrapping is attached to the partition plate 31. Insertion can be performed from the side, and connection work can be performed with the arc tube 8 temporarily fixed to the cover 1 side.
[0050]
Next, another embodiment of the present invention will be described with reference to FIG. The configuration of the bulb-type fluorescent lamp of the embodiment shown in FIG. 4 is the same as that of the embodiment shown in FIG. 1 except for the connection pins 16, and a detailed description of the same configuration will be omitted.
[0051]
FIG. 4 is an enlarged side view showing an inverter circuit portion of a bulb-type fluorescent lamp according to another embodiment of the present invention. The connection pin 16 of the present embodiment is formed by projecting a lead wire of the electronic component 13 mounted on the other surface of the circuit board 14 to one surface side.
[0052]
According to the present embodiment, since the connection wires 16 are formed by projecting the lead wires of the electronic component 13 to one surface side, there is no need for a separate connection pin, and the number of components can be reduced. Have.
[0053]
【The invention's effect】
According to the present invention, since the connection pins are provided on one surface of the circuit board on which the electronic components of the inverter circuit are not mounted so much, the connection pins can be efficiently arranged on the circuit board, and the inverter circuit Can be miniaturized. Further, even if the temperature of the connection pin rises when the lead wire is connected to the electrode of the discharge lamp, it is possible to prevent the electronic components mounted on the other surface from being thermally affected.
[Brief description of the drawings]
FIG. 1 is a partially cutaway side view of a bulb-type fluorescent lamp according to an embodiment of the present invention.
FIG. 2 is an enlarged exploded side view showing a cover and a base of the compact fluorescent lamp of FIG. 1;
FIG. 3 is an enlarged perspective view showing an inverter circuit part of FIG. 1;
FIG. 4 is an enlarged side view showing an inverter circuit portion of a bulb-type fluorescent lamp according to another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Light bulb type fluorescent lamp, 2 ... Base, 4 ... Cover, 8 ... Arc tube as discharge lamp, 6 ... Inverter circuit, 16 ... Wrapping pin as connection pin, 18 ... Lead wire.

Claims (4)

A discharge lamp;
A connection pin connected to a lead wire derived from the discharge lamp, a circuit board on which electronic components constituting a high-frequency lighting circuit for lighting the discharge lamp are mounted, and the connection pin faces the discharge lamp of the circuit board An inverter circuit provided on one side of the side;
A cover for supporting the discharge lamp and containing the inverter circuit;
A base attached to the cover;
A bulb-type fluorescent lamp comprising: 2. The light bulb-shaped fluorescent lamp according to claim 1, wherein the connection pin protrudes from one surface of the circuit board, and a tip of the connection pin is bent so as to be substantially parallel to one surface of the circuit board. 3. The light bulb-type fluorescent lamp according to claim 2, wherein the connection pin is bent so that a tip thereof is directed outward of the circuit board, and a lead wire is wound around the connection pin and connected. The bulb-type fluorescent lamp according to any one of claims 1 to 3, wherein the connection pin is formed by projecting a lead wire of an electronic component mounted on the other surface of the circuit board to one surface side.

Images