JP2003142290A - Discharge lamp lighting device and bulb-type fluorescent lamp - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a discharge lamp lighting device which prevents flickering of brightness at the time of dimming. SOLUTION: When dimming is performed too much due to deep dimming, the phase angle of diac Q2 of dimmer 71 becomes larger than a predetermined value and the voltage of electrolytic capacitor C8 of partial smoothing circuit 76 decreases. I do. The Zener diode ZD3 is turned off, the electrolytic transistor Q7 is turned off, and the field effect transistor Q8 is turned on, so that the gates of the field effect transistor Q4 and the field effect transistor Q5 drop to the negative potential of the full-wave rectifier circuit 74. The field effect transistor Q4 turns off, the oscillation of the inverter circuit 77 stops, and the arc tube 18 turns off. When the field effect transistor Q8 turns on, the diode D13
, A current partially smoothed by the partial smoothing circuit 76 flows through the incandescent lamp 19, and the incandescent lamp 19 is turned on.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp lighting device and a bulb-type fluorescent lamp which prevent flicker even when dimming and lighting.

[0002]

2. Description of the Related Art Generally, a discharge lamp lighting device using a smoothing circuit is connected to a phase control type dimmer for controlling the phase of an AC voltage of a commercial AC power source by a triac or the like, and an AC voltage input to the discharge lamp lighting device. Is controlled by a phase control type dimmer, and the average voltage is changed, so that the discharge lamp can be controlled from the dimming phase of 90 ° to 180 ° without being turned off.

[0003]

However, in the dimming lower limit of the phase control dimmer, that is, when the average voltage is low, the triac has a hysteresis characteristic that the positive and negative conduction times are different because the load is light. The peak value of the lamp current is different depending on whether it is positive or negative, and there is a problem that the brightness of the discharge lamp may flicker.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a discharge lamp lighting device and a bulb-type fluorescent lamp that prevent flicker of brightness even during dimming.

[0005]

A discharge lamp lighting device according to claim 1 is a discharge lamp lighting circuit for lighting a discharge lamp; a dimming amount detecting means for detecting a dimming amount of the discharge lamp; The discharge lamp is provided with switching means for turning off the discharge lamp and turning on a lamp different from the discharge lamp when the quantity detecting means detects that the quantity of dimming is less than a predetermined value. When the dimming amount of the discharge lamp is detected and the dimming amount is detected to be less than or equal to a predetermined value, the switching means switches from the discharge lamp to a separate lamp. Lights up.

A discharge lamp lighting device according to a second aspect is the discharge lamp lighting device according to the first aspect, wherein the dimming amount detecting means is
The voltage applied to the discharge lamp lighting circuit is detected, and the dimming amount can be easily detected by detecting the voltage.

A discharge lamp lighting device according to a third aspect is the discharge lamp lighting device according to the first or second aspect, further comprising a rectifying circuit that rectifies the AC voltage of the AC power supply and supplies the rectified AC voltage to the discharge lamp lighting circuit. The lamp is lit by the output of the rectifier circuit, and flicker does not easily occur.

A discharge lamp lighting device according to a fourth aspect of the present invention is the discharge lamp lighting device according to the first or second aspect, in which the separate lamp is lit by the AC voltage of the AC power supply and does not pass through another circuit. Since a separate lamp is lit, the efficiency loss is small.

A compact fluorescent lamp according to claim 5 includes a fluorescent lamp; a lamp separate from the fluorescent lamp; a discharge lamp lighting device according to any one of claims 1 to 4; and a discharge lamp lighting device. In addition, a cover that supports the fluorescent lamp and a cap that is electrically connected to the discharge lamp lighting device and that is provided at the base end of the cover have their respective functions.

The light bulb shaped fluorescent lamp according to claim 6 is the light bulb shaped fluorescent lamp according to claim 5, wherein the fluorescent lamp is
The separate lamp, which is composed of a plurality of U-shaped tubes and is located between the U-shaped tubes, can efficiently arrange the discharge lamp and the separate lamp.

According to a seventh aspect of the present invention, in the light bulb type fluorescent lamp according to the sixth aspect, the separate lamp is located so as to protrude from the tip of the U-shaped tube.
It is possible to prevent the adverse effect of the fluorescent lamp tube when the separate lamp is turned on.

According to the eighth aspect of the present invention, in the compact fluorescent lamp according to any one of the fifth to seventh aspects, the fluorescent lamp and the separate lamp have substantially the same emission color. Even if the lamp is switched to a separate lamp, the emission color is almost the same, so there is little discomfort.

The light bulb type fluorescent lamp according to a ninth aspect is the light bulb type fluorescent lamp according to any one of the fifth to eighth aspects, wherein the separate lamp is an incandescent light bulb and can be illuminated with low brightness.

A light bulb shaped fluorescent lamp according to a tenth aspect is the light bulb shaped fluorescent lamp according to the ninth aspect, wherein the incandescent light bulb is
The power consumption is 1.5 times or less of the power consumption of the discharge lamp at the time of full light output, and it prevents a bad effect of heat generation by the incandescent light bulb even if it is switched to an incandescent light bulb.

According to the eleventh aspect of the present invention, in the light bulb type fluorescent lamp according to any one of the fifth to tenth aspects, the separate lamp is a light emitting diode and can be illuminated with low brightness.

According to a twelfth aspect of the present invention, in the light bulb type fluorescent lamp according to any one of the fifth to eleventh aspects, the fluorescent lamp is housed and a light diffusion treatment for forming a substantially light bulb shape is performed together with the cover. It is provided with a globe, and the globe is processed to diffuse light, and the entire globe emits light uniformly and can be used in place of the bulb with lower power consumption than the bulb.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a light bulb type fluorescent lamp of the present invention will be described below with reference to the drawings.

FIG. 2 is a side view in which a part of an embodiment of a light bulb type fluorescent lamp is cut away and a globe is seen through, and FIG. 3 is an exploded view of a bulb of the embodiment of the light bulb type fluorescent lamp and the bulb is shown. Is an explanatory view showing an electric circuit for lighting up, and FIG. 4 is a plan view showing a partition of the arc tube in a transparent manner.

First, as shown in FIG. 2, 11 is a light bulb type fluorescent lamp. This light bulb type fluorescent lamp 11 has a cover 14 having a base 12, and a lighting circuit housed in the cover 14 as a discharge lamp lighting device. 16, a globe 17 having translucency, an arc tube 18 as a discharge lamp housed in the globe 17, and an incandescent lamp 19 as a separate lamp. The power consumption of the arc tube 18 is 22 W, and the power consumption of the incandescent lamp 19 is 1.5% of the power consumption of the arc tube 18 in consideration of the influence of the surroundings due to the heat generation of the incandescent lamp 19 and the stress of the lighting circuit 16.
33W or less, which is double or less. The envelope including the base 12, the cover 14, and the globe 17 is formed in an outer shape that is close to the standard size of a general lighting bulb such as an incandescent bulb. For example, the cover 14 has a different shape depending on the shape of the globe 17, and when the globe 17 is A-shaped, the cover 14 cooperates with the globe 17 so as to have a shape close to an A-shaped valve, and when it is G-shaped, Shaped like a part of a sphere close to a bulb. The general lighting bulb is JIS C
7501.

The cover 14 is provided with a cover body 21 made of a heat resistant synthetic resin such as polybutylene terephthalate (PBT). This cover body 21
Has a substantially cylindrical shape with an opening that expands downward, and is formed thin from the middle part to the base end to increase the compatibility with lighting equipment for incandescent bulbs, and the Edison type E26 type etc. at the top end A cap 12 having a center contact and a cap shell that functions as a power receiving means is covered, and is fixed by an adhesive or a supporting means such as caulking which is a mechanical fixing by a punch. The lighting circuit 16 is connected to the eyelet fitting of the base 12 and the base shell.

The globe 17 is made of transparent or light diffusive milky white or sandblasted, and is made of glass or synthetic resin, and has a smooth curved surface shape substantially the same as the glass bulb of a general lighting bulb such as an incandescent bulb. In addition, a fitting edge portion (not shown) that fits inside the lower end opening portion of the cover 14 is formed at the edge portion of the opening portion. The globe 17 can be combined with another member such as a diffusion film to improve the uniformity of brightness.
Alternatively, it can be omitted.

The lighting circuit 16 is a circuit board (PC) arranged horizontally, that is, vertically to the longitudinal direction of the arc tube 18.
A board 24 is provided, and a plurality of electric components 25 and 26 are mounted on both surfaces of the circuit board 24, that is, the upper surface on the side of the base 12 and the lower surface on the side of the arc tube 18.

The circuit board 24 is substantially disc-shaped and is formed to have a diameter dimension of about 50 mm, which is equal to or smaller than that of the disc. Further, on the upper surface of the circuit board 24, an electric component 25 such as an electrolytic capacitor and a film capacitor having relatively low heat resistance, that is, relatively low heat resistance is arranged, and on the lower surface, relatively heat resistant, That is, the electric component 26, which is a chip component having a relatively high heat resistance and a small height, is arranged. Further, they are arranged in an inverted conical shape with the tall electric component as the apex.

Further, as shown in FIGS. 2 to 4, the arc tube 18 is a compact translucent discharge vessel formed by bending a discharge path inside, for example, soda lime glass, lead glass or It has a glass bulb 31 of economical soft glass such as barium silicate glass or hard or semi-hard glass such as borosilicate glass. The crystal structure on the inner surface of the glass bulb 31 is γ-type or α-type.
A three-wavelength phosphor with excellent heat resistance, load characteristics, and color rendering that converts the wavelength of ultraviolet rays generated by discharge to obtain visible light in the desired wavelength range through a protective film mainly composed of alumina fine particles. An unillustrated phosphor layer is formed, whereby the arc tube 18 constitutes a fluorescent lamp. Further, a sealed gas serving as a discharge gas containing a rare gas such as argon serving as an ionization medium and mercury serving as an ionization medium is sealed inside the glass bulb 31, and a pair of electrodes 32 is sealed at both ends of the glass bulb 31 by pinch seals. . Also,
As the rare gas, one or more kinds of argon, krypton, xenon, neon and the like are mixed and several hundreds are mixed.
It is sealed at a pressure of 0 Pa to several 10,000 Pa. It should be noted that if α-type alumina fine particles are used for the protective film, excellent luminous flux rising characteristics are obtained. Further, the phosphor layer may be formed directly on the inner surface without a protective film, or indirectly via a reflective film or the like.

The glass bulb 31 has a plurality of, for example, four U-shaped tubes 33a, 33b, 33c, 33d having substantially the same shape, and these tubes 33a to 33d have, for example, outer diameters. 13m
m or less, preferably 8 mm to 11 mm, and a miniaturized product having a size of 3 mm to 9 mm, for example, a 10 mm glass cross-section having a substantially cylindrical shape, and having a length dimension of 110 mm to 13 mm.
A 0 mm tube is formed in a substantially U shape having a top portion that is smoothly curved at the middle portion. That is, each tube 33a-3
The 3d includes a bent portion 34 that smoothly inverts, and a pair of parallel straight pipe portions 35 that are continuous with the bent portion 34 and are parallel to each other. If the outer diameter of the glass bulb 31 is smaller than 3 mm, the lamp current is excessively reduced, and the lamp current becomes small in order to secure a desired lamp input. Since it is necessary to increase the length of the discharge path to compensate for this, downsizing cannot be achieved, and since the lamp voltage becomes high, the starting voltage also becomes high, the lighting circuit becomes large, and the cost increases. On the contrary, glass bulb
If the outer diameter of 31 exceeds 13 mm, it becomes too large, and it becomes difficult to obtain a compact fluorescent lamp. The inner diameter of the glass bulb 31 is an average value of values obtained by subtracting twice the wall thickness, which is approximately proportional to the outer diameter, from the outer diameter.

Further, each tube body 33 in the middle portion of the glass bulb 31
Tubes 33a, 3 at both ends of b, 33c and both ends of the glass bulb 31
One continuous discharge path 37 is formed by sequentially connecting one end of 3d through three communicating pipe parts 36 that serve as a connecting part. The communication pipe portion 36 is formed by connecting the openings formed by blowing and blowing the ends of the pipe bodies 33a to 33d after heating and melting the ends with a burner. The glass bulb 31 has a length of the discharge path 37 of 25 depending on the lamp power.
It is formed to have a thickness of about 0 mm to 500 mm.

In the state where the glass bulb 31 is incorporated in the light bulb type fluorescent lamp 11, the bent portion 34, which is the top of each of the tubes 33a to 33d, is the center with the vertical direction of the light bulb type fluorescent lamp 11 as the longitudinal direction. Located at equal intervals on a predetermined circumference centered on the axis, the straight pipe portions 35 of each of the tubes 33a to 33d are also arranged on a predetermined circumference centered on the central axis of the bulb-shaped fluorescent lamp 11. Positioned at equal intervals, that is, straight pipe parts of each pipe body 33a to 33d
35 are arranged corresponding to each side of the quadrangular cross section.

Further, cylindrical thin tubes 38a, 38b, 38c and 38d, which are also called exhaust pipes, are provided at one end of each of the tubular bodies 33a to 33d so as to communicate with each other. However, the thin tubes 38a, 38d of the tubular bodies 33a, 33d at both ends of the glass bulb 31 are provided so as to project at the end on the non-electrode side opposite to the end where the electrode 32 is sealed. Each of these thin tubes 38a to 38d is sequentially sealed by fusing in the manufacturing process of the glass bulb 31, and the inside of the glass bulb 31 is exhausted through an unsealed part of each thin tube 38a to 38d, and the enclosed gas is filled. Is sealed and replaced, and then the unsealed part of each of the thin tubes 38a to 38d, for example, the thin tube 38b, is sealed by fusing.

Further, each electrode 32 has a filament coil 41 in which, for example, a tungsten (W) wire is double-wound and an oxide of an electron emitting substance of an alkaline earth metal is applied. It is supported by wells 42 for the linear electrodes of the book. Each Wells 42
The glass bulb 31 is connected to a wire 44 led to the outside of the tube bodies 33a, 33d through unillustrated Dumet wires sealed by pinch seals at the ends of the tube bodies 33a, 33d at both ends. The dumet wire is sealed by a pinch seal portion 45 at the end of the valve. And glass bulb
When the 31 is assembled into the bulb fluorescent lamp 11, the wire 44
Is connected to the lighting circuit 16. Further, each electrode 32 may have a bead mount structure in order to prevent the shape of the filament coil 41 from being disturbed during sealing.

A pinch seal portion 45 sealed by a pinch seal is formed at the ends of the pipes 33a to 33d.

In addition, a main amalgam 51, which serves as a source for releasing mercury as an ionization medium when the thin tube 38a is sealed, is enclosed in the thin tube 38c of the one tube 33c in the middle portion.
The main amalgam 51 is a Bi-In-Hg alloy composed of bismuth, indium and mercury, and is approximately spherical and has a particle size of 2.5 mm.
The mercury vapor pressure in the glass bulb 31 is controlled to be within an appropriate range. The main amalgam 51 may be, for example, Bi-In-Sn in addition to bismuth and indium.
You may use what was formed with the alloy which combined tin, lead, etc. like -Hg. Further, when the content of mercury is about 6% by mass, the mercury easily exudes to the surface of the amalgam to cause stickiness. Therefore, when the amalgam is produced, it is rapidly cooled to reduce the crystal particles or the surface of the amalgam. It is preferable to perform stickiness prevention treatment.
Further, as the outer diameter of the glass bulb 31 becomes smaller, it tends to take time until the mercury vapor pressure in the discharge space is evenly distributed at the time of lighting, so the main amalgam 51 may be supplied at a plurality of positions of the glass bulb 31. .

Further, the thin tubes 38 of the tubes 33b and 33c in the middle part
The end of the side opposite to b and 38c where the thin tubes 38b and 38c are not provided is located in the middle of the discharge path 37, adsorbs the floating mercury in the glass bulb 31 when the lamp is turned off, and starts at the time of starting. An auxiliary amalgam (not shown) is disposed in the middle of the two discharge paths that release the mercury that has been adsorbed in the initial stage of lighting. That is, a tube body 33c sandwiched between two auxiliary amalgams serving as a source for releasing mercury as an ionizing medium in the discharge path of the glass bulb 31.
The main amalgam 51 is arranged at the end of the.

Further, the auxiliary amalgam has a rectangular plate shape which is long in the axial direction of the tubular bodies 33b and 33c, and has a substrate made of, for example, SUS, and one end of this substrate is made of nickel (Ni) and one linear support is provided. It is attached to the wells 54 for auxiliary amalgam as a member by welding. The substrate is plated with a metal such as indium (In) that adsorbs mercury at a position separated from the welded portion with the wells 54. Then, by applying metal plating to the part away from the welded part with the wells 54, the indium of the metal plating melts and reaches the wells 54 when the lamp is lit, and an alloy is formed by the reaction of nickel and indium in the wells 54. Thus, the mercury vapor pressure characteristic is not impaired, and the deterioration of the rising characteristic of the luminous flux at the time of starting due to use over time can be prevented.

An auxiliary amalgam (not shown) on the electrode side, which serves as an auxiliary conductor, is attached to one well 42 of the electrode 32 of each of the tubular bodies 33a and 33d at both ends. The auxiliary amalgam is constructed similarly to the auxiliary amalgam and has similar mercury vapor pressure characteristics.

The distance L between the pinch seal portion 45, which is the end portion of the intermediate pipe body 33b, 33c in which the auxiliary amalgam of the glass bulb 31 is arranged, and the communication pipe portion 36 is formed in the range of 8 to 15 mm. There is. By doing this, the pipes 33a to 33d
At the time of connection processing for connecting the wells 54 with the communication pipe portion 36, the influence of heat on the wells 54 is reduced to prevent the wells 54 from reaching a high temperature and cracking in the pinch seal portion 45 which is a sealing portion.

The arc tube 18 is attached to a partition plate 61 as a supporting means which is a fluorescent lamp fixing member and a lighting circuit fixing member, and the partition plate 61 is fixed to the cover 14. That is, the partition plate 61 is a disc-shaped substrate portion.
62, and the arc tube 18 is fixed to the partition plate 61 by inserting the end portions of the respective tube bodies 33a to 33d into the mounting holes 62a formed in the substrate portion 62 and then adhering them with, for example, a silicone adhesive. Has been done. An incandescent light bulb 19 is attached to the partition plate 61. The incandescent light bulb 19 is a tube body 33a of the arc tube 18.
Aluminum or silver is vapor-deposited on the periphery of the portion facing to 33d, and a light irradiation unit 66 is provided on the tip of a mirror-shaped cylindrical substrate 65.
Is attached to the center of the four tubes 33a to 33d, and the light irradiating section 66 at the tip is in the irradiation direction.
~ 33d is located at the highest position of the globe 17 so as not to be shaded and to project from the tips of the tubes 33a to 33d.

Further, from the outer peripheral portion of the base plate portion 62, there is formed a fitting step portion 63 which extends upward and further outward. Then, the fitting step 63 is fitted inside the cover 14, and the fitting edge of the globe 17 is fitted between the fitting step 63 and the cover 14. Part 63 and cover
These members are fixed to each other by filling with silicone adhesive, for example. A cylindrical mounting piece (not shown) is provided on the upper side of the fitting step portion 63, and the circuit board 24 of the lighting circuit 16 is mounted on the mounting piece by fitting or bonding. Has been.

Next, the lighting circuit 16 will be described with reference to FIG.

FIG. 1 is a circuit diagram showing a lighting circuit.
As shown in, the two-wire dimmer 71 is connected to the commercial AC power supply e, and the commercial AC power supply e and this dimmer 71 constitute an AC power supply 72 whose output voltage is variable by phase control. The two-wire dimmer 71 includes a triac Q1, a noise absorbing capacitor C1 is connected in parallel to the triac Q1, and a triac Q2 has a gate connected to a trigger diac Q2. The diac Q2 is connected to one end of the triac Q1 via a variable resistor R1 for setting a phase angle, and is also connected to the other end of the triac Q1 via a capacitor C2. Then, by changing the resistance value of the variable resistor R1 to change the time constants of the variable resistor R1 and the capacitor C2, the phase at which the triac Q1 is turned on is changed, and the average voltage is changed to turn on all-lighting and dimming lighting. To set.

An impedance element Z1 is connected to the commercial AC power source e via the dimmer 71, and a capacitor C3 is connected in parallel to the impedance element Z1. The commercial AC power source e via the dimmer 71 is connected to the input terminal of a full-wave rectifier circuit 74 composed of four diodes D1 to D4.

Furthermore, the output terminal of the full-wave rectification circuit 74 is
A series circuit of a noise removing inductor L1 and a resistor R2 is connected to form a filter circuit 75 for removing generated high frequency noise so as not to flow out to the commercial AC power supply e.

The peak value of the non-smoothed DC voltage remains in the resistor R2 and the valley of the non-smoothed DC voltage output from the full-wave rectifier circuit 74 is filled to form a partial smoothed voltage. The smoothing circuit 76 is connected. In this partial smoothing circuit 76, a high-frequency bypass capacitor C6 is connected in parallel with the resistor R2, and a series circuit of an electrolytic capacitor C7, a diode D7, a resistor R3, and an electrolytic capacitor C8 is connected in parallel with the capacitor C6. Connected and electrolytic capacitor C7
A diode D8 is connected between the connection point of the diode D7 and the negative electrode of the full-wave rectification circuit 74 in the opposite polarity to the diode D7, and the diode D8 is connected in parallel to the series circuit of the electrolytic capacitor C7, the diode D7 and the resistor R3. The diode D9 is connected.

The partial smoothing circuit 76 is connected with an inverter circuit 77 as a half-bridge type discharge lamp lighting circuit. In this inverter circuit 77, two complementary N-channel MOS field effect transistors Q4 and P-channel MOS field effect transistors Q5 are connected in series, and a frequency of 10 kHz or more, preferably a frequency of 2 kHz is used.
It outputs a high frequency AC of 0 to 200 kHz. Further, the field effect transistor Q4 and the field effect transistor Q5 are connected to one end of the commercial AC power source e via the dimmer 71 via the starting resistor R4, and the field effect transistor Q4 is also connected.
A starting resistor R5 and a capacitor C10 are connected in parallel between the drain and source of Q5. The connection point of the resistor R5 and the capacitor C10 is connected to the inductor L1 via the series circuit of the resistor R6 and the resistor R7, and the capacitor C11 is connected in parallel to the resistor R6. Furthermore, the Zener diode ZD1 and the Zener diode ZD connected in reverse polarity between the gate and source of the field effect transistor Q4.
The series circuit of D2 is connected, and the capacitor C12 and the secondary winding Tr1b of the feedback transformer Tr1 are connected. The capacitor C13 and the field effect transistor Q6 are connected in parallel to the secondary winding Tr1b of the feedback transformer Tr1.
The series circuit of is connected.

Further, there is a protection circuit 78 for stopping the oscillation when the dimming becomes lower than the lower limit value. The protection circuit 78 is connected to the connection point of the resistor R3 and the electrolytic capacitor C8 and the negative side of the full-wave rectification circuit 74. A series circuit of a Zener diode ZD3, a resistor R9 and a resistor R10 as a dimming amount detection means is connected between the resistor R8, a capacitor C14 is connected in parallel with the resistor R10, and a connection point of the resistor R9 and the resistor R10. The gate of field effect transistor Q7 is connected to, the drain of field effect transistor Q7 is connected to the connection point of resistor R3 and electrolytic capacitor C8 via resistor R11, and the gate of field effect transistor Q7 is connected to resistor R15 via capacitor C15. It is connected between R4 and the negative electrode of the full-wave rectification circuit 74. Further, the connection point of the resistors R9 and R10 is connected to the drain of the field effect transistor Q8 through the resistor R13 and the diode D11, and the drain of the field effect transistor Q8 is connected through the diode D12 to the field effect transistor Q4 and the field effect transistor Q8. Connected to the gate of transistor Q5. Further, the drain of the field effect transistor Q8 as the switching means is connected to the inductor L1 via the series circuit of the diode D13 and the incandescent lamp 19. Furthermore, the connection point of the resistors R7 and R8 is connected to the connection point of the field effect transistor Q4 and the field effect transistor Q5 via the series circuit of the Zener diode ZD4 and the resistor R17,
A capacitor C16 is connected in parallel with R17, and the connection point of the Zener diode ZD4 and the resistor R17 is connected to the gate of the field effect transistor Q6.

Further, a load circuit 79 is connected between the drain and source of the field effect transistor Q5, and this load circuit 79 is a series winding of the primary winding Tr1a of the feedback transformer Tr1 to the step-up transformer Tr2 of the single winding transformer. The common winding Tr2a of the step-up transformer Tr2 is connected to the series circuit of the Tr2b and the DC cut capacitor C17, and the filament coil 41, 41 of the arc tube 18 is connected via the series winding Tr2b and the current limiting inductor L2.
This filament coil connected to one end of each
Capacitor C18 and resistor R for starting are connected between the other ends of 41 and 41.
19 series circuits are connected.

Next, the operation of the lighting circuit 16 of the above embodiment will be described.

First, the case where the dimmer 71 is not connected or the dimmer 71 is set to the full-light lighting state will be described. The lighting circuit 16 is compatible with either the commercial AC power supply e to which the dimmer 71 is connected or the commercial AC power supply e to which the dimmer 71 is not connected.

A current flows from the commercial AC power source e to the resistor R4, the zener diodes ZD1 and ZD2, and the resistor R8 to charge the capacitor C10 and turn on the field effect transistor Q4.

When the field effect transistor Q4 is turned on, the partial smoothing circuit 76 causes the field effect transistor Q4, the primary winding Tr1a of the feedback transformer Tr1 and the series winding Tr of the step-up transformer Tr2.
2b, current limiting inductor L2, filament coil 41, capacitor C18, resistor R19, filament coil 41, capacitor
Voltage is applied to C16 and resistor R4, and mainly capacitor C17
The resonance of the current limiting inductor L2 and the like turns off the field effect transistor Q4 and turns on the field effect transistor Q5. By these operations, the field effect transistor Q4 and the field effect transistor Q5 are alternately turned on and off repeatedly.

This operation is repeated to generate a high-frequency AC voltage, preheat the filament coils 41, 41, and when the voltage between the filament coils 41, 41 becomes a voltage higher than a predetermined value, the arc tube 18 is started and turned on.

Further, the electrolytic capacitor C of the partial smoothing circuit 76
The smoothed DC voltage from the full-wave rectifier circuit 74 is charged in each of 7 and C8 with a voltage half the peak value of the unsmoothed DC voltage. On the other hand, at the time of discharging, the electrolytic capacitors C7 and C8 are discharged in parallel by the diodes D7 to D9. Therefore, the valley portion in the half-wave rectified waveform of the commercial AC power supply e is filled up, and so-called partial smoothing voltage is generated in the electrolytic capacitors C7 and C8. By using the partial smoothing circuit 76 in this way, the conduction angle of the non-smoothed DC voltage changes due to dimming, but in the partial smoothing circuit 76, the partial wave from the full-wave rectification circuit 74 is changed according to the conduction angle of the non-smoothed DC voltage. As the magnitude of the input current flowing into the smoothing circuit 76 changes, the smoothed DC voltage also changes. Therefore, the change in the conduction angle due to the dimming and the magnitude of the lamp current supplied to the arc tube 18 show a correlation, and the dimming becomes smooth and the dimming characteristic becomes good. Further, the use of the partial smoothing circuit 76 can prevent the inrush current. In addition, the capacitor C11
Since the voltage between both terminals of the FET rises and the Zener diode ZD4 turns on and the field effect transistor Q6 turns on, the capacitor C13 is electrically connected and the field effect transistor Q4
Also, the oscillation frequency of the field effect transistor Q5 becomes lower, the lamp current increases, and the arc tube 18 becomes brighter.

Further, since the periphery of the base 65 of the incandescent lamp 19 is a mirror surface and the periphery of the base 65 faces the inner surface side of the arc tube 18, the light directed toward the inside of the arc tube 18 is not reflected. The luminous efficiency is also improved by being reflected by the surroundings and being irradiated to the outside.

Next, the case where the dimmer 71 is connected for dimming will be described.

First, by operating the variable resistor R1 of the dimmer 71, the operating phase angle of the diac Q2 is changed, the conduction phase angle of the triac Q1 is changed, and the average voltage is lowered to adjust the arc tube 18. Glow. That is, when the input voltage decreases due to dimming, the voltage across the capacitor C11 decreases, the Zener diode ZD4 turns off, and the field effect transistor Q6 turns off.Therefore, the capacitor C13 is not electrically connected. The oscillation frequencies of the field effect transistor Q4 and the field effect transistor Q5 increase, the lamp current decreases, and the arc tube 18 becomes dark.

If, for example, deep dimming is performed excessively and dimming is performed above the lower limit value, if the phase angle of the diac Q2 of the dimmer 71 becomes greater than a predetermined value and the rest period becomes long, the partial smoothing circuit 76 The voltage of the electrolytic capacitor C8 drops, the Zener diode ZD3 turns off, the electrolytic transistor Q7 turns off, and the field-effect transistor Q8 turns on, so that the gates of the field-effect transistor Q4 and the field-effect transistor Q5 become the full-wave rectifier circuit 74. Since it falls to the negative potential, the field effect transistor Q4 is turned off, the oscillation of the inverter circuit 77 is stopped, and the arc tube 18 is turned off.

When the field effect transistor Q8 is turned on, a current partially smoothed by the partial smoothing circuit 76 flows to the incandescent light bulb 19 through the diode D13, and the incandescent light bulb 19 is generated.
Lights up. Then, at this time, hunting by the partial smoothing circuit 76 does not occur, so that the switching from the arc tube 18 to the incandescent lamp 19 becomes good. Since the current flowing through the incandescent lamp 19 is partially smoothed, there is no large flicker. Further, since the light emitting portion 66 of the incandescent lamp 19 projects from the tip of the arc tube 18 and the base 65 around the portion of the arc tube 18 facing each of the tubes 33a to 33d is a mirror surface, the light emitting portion. Since there is little shielding of light by the arc tube 18 when 66 is turned on, it is possible to prevent the shadow of the arc tube 18 due to lighting of the incandescent lamp 19.

As described above, when the light emitting tube 18 is dimmed, and the dimming degree becomes the lower limit value or more, the phase conduction angle becomes large and the current quiescent period becomes long, the light emitting tube 18 is turned off and the incandescent lamp 19 is provided. By turning on, the brightness is adjusted without causing flicker and the phase angle of the dimmer 71 becomes 180 °.
% Dimming can be reduced. If the light emission color of the arc tube 18 is set to be substantially the same according to the light emission color of the incandescent light bulb 19, there will be no discomfort when switching from the light emission tube 18 to the incandescent light bulb 19.
Also, if the emission color of the arc tube 18 is white, day white or daylight color, it approaches the daytime color when all lights are on, and becomes the nighttime emission color in the case of deep dimming, compared with conventional fluorescent lamps and nightlights. It has the same function and effect as a lighting fixture equipped with, and is effective for bedside lights in bedrooms.

Next, the lighting circuit 16 of another embodiment is shown in FIG.
Will be described with reference to.

FIG. 5 is a circuit diagram showing the lighting circuit. In the lighting circuit 16 shown in FIG. 1, the incandescent light bulb 19 is lit by the output of the partial smoothing circuit 76, while the commercial circuit via the dimmer 71 is used. The incandescent light bulb 19 is turned on by the AC voltage of the AC power supply e. That is, instead of the diode D13 shown in FIG. 1, the diode D15 and the diode D16 are connected to both ends of the commercial AC power source e via the dimmer 71, and the incandescent light bulb 19 is connected to the connection point of the diode D15 and the diode D16. It was done. That is, the AC voltage of the commercial AC power supply e is half-wave rectified and full-wave rectified by the diode D15 and the diode D16, respectively, and the incandescent lamp 19 is lit by the full-wave rectified AC voltage.

As described above, by directly applying the voltage from the commercial AC power source e and not using the full-wave rectifier circuit 74 and the partial smoothing circuit 76 when the incandescent lamp 19 is turned on, it is possible to prevent a decrease in efficiency. Since the power consumption when the incandescent light bulb 19 is turned on is higher than when the arc tube 18 is turned on, the stress of the full-wave rectification circuit 74 and the partial smoothing circuit 76 can be prevented.

Next, a bulb-shaped fluorescent lamp according to another embodiment.
11 will be described with reference to FIGS. 6 and 7.

FIG. 6 is a side view in which a part of an embodiment of a light bulb type fluorescent lamp is cut out and a globe is seen through, and FIG. 7 is a plan view in which a partition of an arc tube is seen through. And
The bulb-type fluorescent lamp 11 shown in FIGS.
Or a partition plate 61 similar to the bulb-type fluorescent lamp 11 shown in FIG.
The incandescent light bulb 19 is attached to, but the incandescent light bulb 19 is different. This incandescent light bulb 19 has a light irradiation unit 91 that is lower than the height of each of the tube bodies 33a to 33d of the arc tube 18 and that has a clear light irradiating portion around the portion of the arc tube 18 facing each of the tube bodies 33a to 33d. The tip has a tip portion 92 which is located closer to the base end than the tip of each of the tubes 33a to 33d and which has been subjected to light diffusion processing such as milky white.

The U-shaped pipes 33a to 33d and the pipes 33a to 33d adjacent to each other are provided with the pipes.
Silicone resin 94 having substantially the same light transmittance as 33a to 33d is filled. The silicone resin 94 is used for the pipes 33a to 33d.
It also has the function of holding and fixing.

When the incandescent light bulb 19 is turned on,
As for the tip direction, since the tip portion 92 is subjected to the light diffusion process, the tip direction of the globe 17 can be uniformly irradiated, and the light emitted from the light irradiating portion 91 is the respective tubes 33a to 33d of the arc tube 18 or the silicon resin. Incandescent light bulb 19 because it is illuminated through 94
It is possible to prevent the arc tube 18 from being shaded due to lighting, and to uniformly illuminate the surrounding area.

Even if a silicone resin 94 having a light shielding property is used, there is no light directly radiated around the tubes 33a to 33d of the arc tube 18, and at least the U-shaped tubes are provided. Since the light is diffused through the tubes 33a to 33d and diffused by the respective tubes 33a to 33d, it is possible to prevent the arc tube 18 from being shaded due to the lighting of the incandescent lamp 19, and to uniformly irradiate the surroundings.

Note that the dimmer 71 does not generally form the bulb-type fluorescent lamp 11 but is used by being embedded in the wall surface of the room or built in a lighting fixture. It can be incorporated into the lamp 11.

In any case, a light emitting diode may be used instead of the incandescent lamp 19. When this light emitting diode is used, if it is arranged circumferentially around the base end side of the light emitting tube 18, the whole can be made evenly bright.

[0068]

According to the discharge lamp lighting device of the first aspect, the dimming amount detecting means detects the dimming amount of the discharge lamp, and when the dimming amount is detected to be equal to or less than the predetermined value, switching is performed. Since the means switches from the discharge lamp to the separate lamp, the separate lamp can be turned on without flicker of the discharge lamp due to deep dimming.

According to the discharge lamp lighting device of the second aspect,
In addition to the discharge lamp lighting device according to the first aspect, since the dimming amount detection means detects the voltage applied to the discharge lamp lighting circuit, the dimming amount can be easily detected by detecting the voltage.

According to the discharge lamp lighting device of the third aspect,
In addition to the discharge lamp lighting device according to the first or second aspect, the separate lamp is lit by the output of the rectifying circuit that rectifies the AC voltage of the AC power source, and thus flicker can be less likely to occur.

According to the discharge lamp lighting device of the fourth aspect,
In addition to the discharge lamp lighting device according to the first or second aspect, since the separate lamp is lit by the AC voltage of the AC power source, the separate lamp is lit without passing through another circuit, so that the efficiency reduction can be reduced.

According to the bulb-type fluorescent lamp of the fifth aspect, the cover for housing the discharge lamp lighting device according to any one of the first to fourth aspects and supporting the fluorescent lamp and the discharge lamp lighting device are electrically connected. Since it is provided with the base which is connected and is provided at the base end of the cover, each effect can be exhibited.

According to the compact fluorescent lamp of the sixth aspect, in addition to the compact fluorescent lamp of the fifth aspect, the fluorescent lamp is located between the U-shaped tubes, and the discharge lamp and the separate lamp are provided. Can be arranged efficiently.

According to the self-ballasted fluorescent lamp of the seventh aspect, in addition to the self-ballasted fluorescent lamp of the sixth aspect, the separate lamp is located so as to project from the tip of the U-shaped tube.
It is possible to prevent the adverse effect of the fluorescent lamp tube when the separate lamp is turned on.

According to the self-ballasted fluorescent lamp of the eighth aspect, in addition to the self-ballasted fluorescent lamp of any one of the fifth to seventh aspects, even if the discharge lamp is switched to a separate lamp, the emission color is substantially the same. You can reduce discomfort.

According to the self-ballasted fluorescent lamp of the ninth aspect, in addition to the self-ballasted fluorescent lamp of any one of the fifth to eighth aspects, the separate lamp is an incandescent bulb and can be illuminated with low brightness.

According to the light bulb type fluorescent lamp of the tenth aspect, in addition to the light bulb type fluorescent lamp of the ninth aspect, the incandescent light bulb consumes less than 1.5 times the power consumption of the discharge lamp at the time of full light output. Therefore, even if the incandescent light bulb is switched to, it is possible to apply a great stress and prevent the harmful effect of heat generation by the incandescent light bulb.

According to the eleventh aspect of the light bulb type fluorescent lamp, in addition to the light bulb type fluorescent lamp according to any one of the fifth to tenth aspects, since the separate lamp is a light emitting diode, it can be illuminated with low luminance.

According to the light bulb shaped fluorescent lamp of the twelfth aspect, in addition to the light bulb shaped fluorescent lamp according to any one of the fifth to eleventh aspects, a light diffusion treatment for accommodating the fluorescent lamp and forming a substantially light bulb shape together with the cover is performed. Since the globe is provided, the globe is treated to diffuse light, so that the entire globe can emit light uniformly and can be used in place of the bulb with lower power consumption than the bulb.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a lighting circuit according to an embodiment of the present invention.

FIG. 2 is a side view in which a part of the bulb-type fluorescent lamp is cut out and the globe is seen through.

FIG. 3 is an explanatory view showing an expanded bulb of the same bulb-type discharge lamp and showing an electric circuit for lighting the bulb.

FIG. 4 is a plan view in which a partition of the arc tube is seen through.

FIG. 5 is a circuit diagram showing a lighting circuit according to another embodiment of the above.

FIG. 6 is a side view in which a part of a bulb-type fluorescent lamp of another embodiment of the above embodiment is cut away and a globe is seen through.

FIG. 7 is a plan view in which a partition of the arc tube is seen through.

[Explanation of symbols]

11 Light bulb type fluorescent lamp 12 mouthpiece 14 cover 16 Lighting circuit as a discharge lamp lighting device 17 gloves 18 Arc tube as a discharge lamp 19 Incandescent light bulb as a separate lamp 33a-33d tube 72 AC power supply 76 Partial smoothing circuit 77 Inverter circuit as discharge lamp lighting circuit Q8 Field effect transistor as switching means ZD3 Zener diode as a dimming amount detection means

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3K073 AA27 AA52 AA62 AA85 BA02                       BA09 BA20 CA01 CF01 CF10                       CF12 CF18 CG02 CG09 CG11                       CG16 CG22 CG28 CG55 CJ13                       CJ14 CJ16 CJ17 CL10 CM09                 3K098 CC12 CC15 CC23 CC41 CC60                       CC70 DD17 DD18 DD21 DD27                       DD35 DD37 DD43 EE03 EE08                       EE12 EE14 EE18 EE20 EE28                       EE40 FF04 FF09 FF14 GG02                       GG03

Claims (12)

[Claims] 1. A discharge lamp lighting circuit for lighting a discharge lamp; a dimming amount detecting means for detecting a dimming amount of the discharge lamp;
The discharge lamp is provided with switching means for turning off the discharge lamp and turning on a lamp separate from the discharge lamp when the dimming amount detecting means detects the dimming amount less than a predetermined value. Lighting device. 2. The discharge lamp lighting device according to claim 1, wherein the dimming amount detecting means detects a voltage applied to the discharge lamp lighting circuit. 3. A rectifying circuit for rectifying an AC voltage of an AC power source and supplying the rectified AC voltage to a discharge lamp lighting circuit, wherein a separate lamp is lit by the output of the rectifying circuit. Discharge lamp lighting device. 4. The discharge lamp lighting device according to claim 1, wherein the separate lamp is lit by an AC voltage of an AC power source. 5. A fluorescent lamp; a lamp separate from the fluorescent lamp; a discharge lamp lighting device according to any one of claims 1 to 4; and a cover for housing the discharge lamp lighting device and supporting the fluorescent lamp. A light bulb-shaped fluorescent lamp, comprising: a base which is electrically connected to a discharge lamp lighting device and which is disposed at a base end of a cover; 6. The fluorescent lamp according to claim 5, wherein the fluorescent lamp is composed of a plurality of U-shaped tubes, and the separate lamps are located between the U-shaped tubes. lamp. 7. The bulb-type fluorescent lamp according to claim 6, wherein the separate lamp is positioned so as to protrude from the tip of the U-shaped tube. 8. The bulb-type fluorescent lamp according to claim 5, wherein the fluorescent lamp and the separate lamp have substantially the same emission color. 9. The self-ballasted fluorescent lamp according to claim 5, wherein the separate lamp is an incandescent lamp. 10. The bulb-type fluorescent lamp according to claim 9, wherein the incandescent lamp consumes 1.5 times or less of the power consumption of the discharge lamp at the time of full light output. 11. The bulb-type fluorescent lamp according to claim 5, wherein the separate lamp is a light emitting diode. 12. The bulb-type fluorescent lamp according to claim 5, further comprising a globe in which the fluorescent lamp is housed and which is subjected to a light diffusion process to form a substantially bulb-shaped shape together with the cover.