JPH08190894A - Fluorescent lamp device, and lighting system and bulb type fluorescent lamp using the same - Google Patents

Abstract

PURPOSE: To provide a fluorescent lamp device, a lighting device and a bulb type fluorescent lamp in which flickering can be suppressed even when the afterglow time is short. CONSTITUTION: This device has a fluorescent lamp 10 having a film 5 consisting of a phosphor and having emission peaks at least in three wavelength areas of red, green and blue and an afterglow time less than 6.8ms, the film being formed on the inner surface of a bulb, and a high frequency lighting device 22 for lighting the fluorescent lamp 10 at a high frequency of 20kHz or more. Since the lamp is thus lighted at high frequency even when the afterglow time of the lamp is short, redischarge is started before the light output is reduced, and flickering can be suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent lamp device, an illuminating device, and a light bulb, which are capable of high-frequency lighting of a fluorescent lamp having a coating of a phosphor having emission peaks in at least three wavelength regions of red, green and blue. Shape fluorescent lamp.

[0002]

2. Description of the Related Art Recently, as a fluorescent lamp for general lighting,
Fluorescent lamps having improved color rendering properties have been developed by using a phosphor coating having emission peaks in at least three wavelength regions of red, green and blue.

This type of three-wavelength fluorescent lamp is constructed by mixing a red phosphor, a green phosphor and a blue phosphor at a predetermined ratio and applying the mixed phosphor to the inner surface of the bulb. Each of the phosphors is excited by the 185 nm and 254 nm ultraviolet rays emitted from the mercury enclosed in the bulb, and the respective phosphors become 440 to 460 nm and 520 to 575 nm.
Since light having an emission peak in the wavelength region of 600 nm to 600 to 620 nm is emitted, these lights are combined to emit white light, and the lamp has high efficiency and excellent color rendering.

By the way, recently, studies have been conducted on phosphors applied to bulbs for the purpose of improving emission color, and various phosphors have been developed. However, when the three-wavelength fluorescent lamp is turned on by a commercial power source, flicker may be felt. There are various possible causes for the flicker of the light emitted from the lamp during stable lighting, and the main cause is that the afterglow time is short. The afterglow time means the time until the light output of the lamp is reduced to 1/10 when the lighting of the lamp is stopped. If the afterglow time is long, the next discharge light emission starts before the light emission is extinguished, so that the change in the light output is reduced and the flicker feeling is reduced.

[0005]

However, in the three-wavelength emission type fluorescent lamp, phosphors having different emission wavelengths are used, and these phosphors have different afterglow characteristics. In particular, green-based phosphors have various afterglow times, and when a phosphor having a short afterglow time is used, flicker is noticeable. This is because the green sensitivity is the most excellent among the three wavelengths in terms of human eye sensitivity, and thus the afterglow time of the green fluorescent material greatly affects the flicker feeling.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a fluorescent lamp device capable of suppressing the occurrence of flicker even in a lamp having a short afterglow time, and a fluorescent lamp device for the same. It is intended to provide a lighting device and a bulb-type fluorescent lamp used.

[0007]

The invention of claim 1 uses a phosphor having an emission peak in at least three wavelength regions of red, green and blue on the inner surface of the bulb and having an afterglow time of 6.8 ms or less. And a high-frequency lighting device that lights the fluorescent lamp at a frequency of 20 kHz or higher.

According to a second aspect of the present invention, a phosphor coating is formed on the inner surface of the bulb, which has a luminescence peak in at least three wavelength bands of red, green and blue and has an afterglow time of 6.8 ms or less. Fluorescent lamp and this fluorescent lamp 40kH
A high-frequency lighting device for lighting at a frequency of z or higher, and a fluorescent lamp device.

According to a third aspect of the present invention, the phosphor coating having an emission peak in at least three wavelength bands of red, green and blue is
The fluorescent lamp device according to claim 1 or 2, wherein the phosphor that emits green light is a terbium-activated green phosphor.

According to a fourth aspect of the invention, the phosphor coating having an emission peak in at least three wavelength bands of red, green and blue is
20. The fluorescent lamp device according to claim 1, wherein 20% or more of the entire phosphor is a terbium-activated green phosphor.

A fifth aspect of the present invention is an illuminating device comprising the fluorescent lamp device according to the first aspect and a lighting fixture body in which the fluorescent lamp device is incorporated.

According to a sixth aspect of the present invention, a cover having a screw-type base at one end and a valve attached to the other end of the cover and bent, have at least a red, green and blue system on the inner surface. Has an emission peak in three wavelength regions and an afterglow time of 6.
A fluorescent lamp formed with a phosphor coating using a phosphor of 8 ms or less, and the fluorescent lamp housed in the cover,
A high-frequency lighting device for lighting at a frequency of not less than kHz, and a compact bulb-shaped fluorescent lamp.

[0013]

According to the invention of claim 1, even a lamp using a phosphor having an afterglow time until the light output is reduced to 1/10 is 6.8 ms or less, it is lit at a high frequency of 20 kHz or more. Therefore, the next discharge emission starts before the light output decreases to 1/10 or less, and the occurrence of flicker can be suppressed.

According to the second aspect of the present invention, since the lighting device for supplying a high frequency supplies a high frequency of 40 kHz or more, the existing high frequency lighting device can be used. Claim 3
According to the invention, the phosphor coating having an emission peak in the three wavelength region is a terbium-activated green phosphor, so that the afterglow time of the entire lamp is 6.8 ms or less. It becomes short. That is, the visual sensitivity of the human eye is 3
Among the wavelengths, green is excellent, and therefore the afterglow time of the green phosphor has a great influence when flicker is felt. And it is known that the afterglow time of the terbium-activated type is shorter than that of the manganese-activated type in the green-based phosphor. Easier to do.
Therefore, when such a phosphor is used, it is possible to prevent the occurrence of flicker by performing high frequency lighting.

According to the fourth aspect of the invention, the total amount of the phosphor is 2
Since 0% by weight or more is used as a terbium-activated green phosphor,
For the same reason as above, the afterglow time of the green phosphor has a great influence on the flicker, so that the flicker suppressing effect becomes large when the terbium-activated green phosphor having a short afterglow time is used. According to the fifth and sixth aspects of the present invention, it is possible to provide a lighting device and a bulb-type fluorescent lamp with less flicker.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. In the figure, reference numeral 10 indicates a straight tube type fluorescent lamp, and 1 is an arc tube bulb made of soda lime glass. The end of this valve 1 has stems 2, 2
The stems 2 and 2 are airtightly penetrated by the wells 3 ... Electrodes 4 and 4 are attached to each well 3 ..., and these electrodes 4 and 4 are formed by a double or triple coil made of a tungsten filament. Electrons (emitters) (not shown) made of BaO, SrO, CaO or the like are applied to these electrodes 4 and 4.

A phosphor coating 5 is formed on the inner surface of the bulb 1. This phosphor coating 5 is at least 440-4
60nm (blue), 520-575nm (green) and 600-
It is formed of a three-wavelength light emitting phosphor having an emission peak in the 620 nm (red) region. This three-wavelength light-emitting phosphor is a mixture of three types of phosphors that emit light in the respective wavelength regions of blue, green, and red.
_The trivalent europium-activated yttrium oxide phosphor represented by ₂ O ₃ : Eu and the blue phosphor include BaMg ₂
Al ₁₆ O ₂₇ : Eu divalent europium activated barium, magnesium, aluminate phosphor, and (LaCe) PO ₄ : Tb trivalent terbium activated lanthanum represented by green emitting phosphor, A cerium phosphate phosphor is used.

Bases 6, 6 are attached to the ends of the valve 1, and base pins 7 projecting from the bases 6, 6 are provided.
Are electrically connected to the wells 4 described above. The bulb 1 is filled with a predetermined amount of mercury and a rare gas having a predetermined pressure such as argon.

The fluorescent lamp 10 having such a structure is shown in FIG.
As shown in, a lighting device is configured by being attached to a lighting fixture. The lighting fixture is provided with sockets 21 and 21 at both ends of the lighting fixture body 20, and the fluorescent lamp 10 is mounted between the sockets 21 and 21. A high-frequency lighting device for turning on the fluorescent lamp 10 at a high frequency, that is, a high-frequency lighting circuit (inverter) 22 is housed in the lighting fixture body 20.

The high frequency lighting circuit 22 has a circuit structure which emits a high frequency of 20 kHz or more, and has a known 40 kHz.
It may be an inverter circuit that emits a high frequency equal to or higher than z.
The fluorescent lamp 10 and the high frequency lighting circuit 22 constitute the circuit shown in FIG.
It is connected to a commercial power supply 25 of 0 Hz.

In the fluorescent lamp 10 having such a structure, the afterglow time during lighting is 6.3 ms, and the fluorescent lamp 10 having such an afterglow characteristic emits afterglow when a choke coil type ballast is turned on. I feel flickering because the time is short,
Flickering can be suppressed by using in combination with the high frequency lighting circuit 22.

This has been confirmed by the experiments of the present inventors, and the experiments will be described below. Recently, the development of phosphor materials has made remarkable progress, and the development of phosphors that can be practically used for fluorescent lamps is under way. The present inventors paid attention to the afterglow time of the phosphor and investigated the afterglow time of the phosphor applicable to the fluorescent lamp. The results are shown in Table 1 below.
Shown in

[0023]

[Table 1]

Further, a 40 W straight tube fluorescent lamp using a combination of the phosphors shown in Table 1 above was manufactured, and the occurrence of flicker was examined. The results are shown in Table 2 below. For flicker, a white wall is illuminated with light emitted from a fluorescent lamp, and 24 observers observe the light on this wall to determine whether or not the flicker is felt, and more than half of the observers flicker. When it was evaluated as not feeling, it was judged that the flicker was suppressed.

[0025]

[Table 2]

In Table 1, the white phosphor indicated by W1 is a calcium halophosphate phosphor used alone in a conventional fluorescent lamp, and 1/10 of the calcium halophosphate phosphor remains. The light time is 29 ms. Even if this 40 W straight tube fluorescent lamp using this calcium halophosphate phosphor is used in combination with a choke coil type ballast, flicker is not recognized as shown in Conventional Example 2 in Table 2. In addition, the green light-emitting phosphor shown as G2 in Table 1 has an afterglow time of 28 ms, and a fluorescent lamp using a three-wavelength light-emitting phosphor mixed with this is shown as Conventional Example 1 in Table 2. As stated, the afterglow time of the entire lamp is 20
Since it was ms, more than half of the observers did not recognize the occurrence of flicker.

On the other hand, the green light-emitting phosphor shown as G1 in Table 1 has an afterglow time of 6.8 ms, and the fluorescence using the three-wavelength light-emitting phosphor mixed with this green phosphor is used. As shown in Example 1 of Table 2, the lamp had an afterglow time of 6.3 ms as a whole, and flicker was observed when used in combination with a choke coil type ballast.

However, when the lamp of Example 1 is lit at high frequency, no flicker is observed. A 40 W straight tube fluorescent lamp using the mixed phosphor of Example 1 is shown in FIG.
The total luminous flux after 100 hours of lighting is 3500 lm, the average color rendering index Ra is 84, and this lamp has a spectral distribution characteristic shown in It was confirmed that both the luminous flux lm and the average color rendering index Ra were excellent. The lamp shown in Example 2 of Table 2 has a plurality of green phosphors G1 and G2.
This is the case when they are mixed and used. In this case, since the green light emitting phosphor of G1 having a short afterglow time is used in an amount of 20% by weight or more, the overall afterglow time becomes as short as 6.8 ms. However, even in this case, if high frequency lighting of 20 kHz or more is performed,
It was possible to prevent flickering.

As can be seen from the above description, in the case of the three-wavelength emission type fluorescent lamp 10, when the afterglow time is 6.8 ms or less, the flicker is suppressed by using high frequency power of 20 kHz or more for lighting. You can

In this case, if the frequency is set to 40 kHz or higher, the existing high frequency lighting circuit emits a high frequency of 40 kHz or higher, so that the existing high frequency lighting circuit can be utilized. In the case of a terbium activated green phosphor, the afterglow time of the entire lamp is 6.8 ms or less for the phosphor that emits green light of the phosphor coating having an emission peak in three wavelength regions.
In other words, the human eye is highly sensitive to luminosity among the three wavelengths, and thus the afterglow time of the green-based phosphor is a major factor when flicker is felt. And Table 1
From this, it is confirmed that the afterglow time of the green phosphor is shorter in the terbium-activated type than in the manganese-activated type. Therefore, when the terbium-activated phosphor is used as the green phosphor, the afterglow time becomes short.
When 0 is used in combination with the high frequency lighting circuit 22, it is effective in preventing flicker.

Further, as can be understood from Examples 1 and 2 shown in Table 2, when the mixing ratio of the terbium-activated green phosphor is 20% by weight or more based on the whole phosphor, the same as above. For the reason, the afterglow time of the green phosphor becomes short, and the flickering of the lamp becomes noticeable. Therefore, if such a lamp and the high frequency lighting circuit 22 are used in combination, flicker can be suppressed.

According to the lighting device shown in FIG. 2, since the fluorescent lamp with less flicker is used as the light source, the lighting device with less flicker can be provided. The present invention is not limited to the structure of the above embodiment. That is, the present invention is not limited to the straight tube fluorescent lamp, but can be applied to the ring fluorescent lamp, the bulb fluorescent lamp shown in FIG. 5, and the like. The bulb-type fluorescent lamp 50 shown in FIG.
Will be described. In FIG. 5, reference numeral 51 is a cover made of a heat-resistant synthetic resin such as PBT resin.
A screw-type base 52 such as an E26 type is attached to one end of the, and the other end is closed by a partitioning plate 53. A lamp mounting cylinder 54 is integrally formed on the partition board 53, and a fluorescent lamp 55 is mounted on the lamp mounting cylinder 54.

The fluorescent lamp 55 may be U-shaped, W-shaped or the like, but a saddle-shaped fluorescent lamp is used in this embodiment. Electrodes 56 are sealed at both ends of the saddle type fluorescent lamp 55, and a three-wavelength emission type phosphor coating film (not shown) is formed on the inner surface of the bulb. A thin tube 57 projects from at least one end of the lamp 55.
An amalgam 58 is housed in 7. The amalgam 58 controls the mercury vapor pressure during lighting. The valve is filled with a rare gas such as argon.

Both ends of the saddle type fluorescent lamp 55 are inserted into the lamp mounting tube portion 54 of the partition board 53, and are fixed to the partition board 53 via a thermosetting adhesive 60 such as silicone. There is. The central bent portion of the lamp 55 is also fixed to the partition board 53 via another adhesive 61. Further, the partition board 53 is located in the space covered by the cover 51, and uses a transistor inverter. The high frequency lighting device 65 that has been used is housed. The high frequency lighting device
It is electrically connected to the electrodes of the bent fluorescent lamp 55.

The fluorescent lamp 55 is covered with a globe 70. The globe 70 is made of transparent or light-diffusing synthetic resin or glass, and has a cup shape with an open upper end. The upper end opening of the globe 70 is inserted between the inner surface of the cover 51 and the partition board 53, and is joined to the inner surface of the cover 51 and the partition board 53 by an adhesive 71.

Even if the afterglow time of the entire lamp is shortened by using the green light-emitting phosphor having a short afterglow time in the light bulb type fluorescent lamp 50 having such a structure,
Flickering can be prevented by lighting at a high frequency of 0 kHz or higher.

Moreover, such a bulb-shaped fluorescent lamp 50
Since it has its own high-frequency lighting device 65, it can be attached to an incandescent light bulb socket for lighting.
In the above embodiment, the lamp using the three-wavelength light emitting phosphor has been described, but a lamp using three or more wavelengths, for example, a five-wavelength light emitting phosphor can be used.

[0038]

As described above, according to the invention of claim 1, even a lamp using a phosphor having an afterglow time of 6.8 ms or less is lit at a high frequency of 20 kHz or more,
The next discharge light emission starts before the discharge is stopped and the light output is reduced, so that the occurrence of flicker can be suppressed.

According to the second aspect of the invention, the lighting device for supplying a high frequency supplies a high frequency of 40 kHz or more, so that the existing high frequency lighting device can be used. Claim 3
According to the invention, the phosphor coating having an emission peak in the three wavelength region is a terbium-activated green phosphor, so that the afterglow time of the entire lamp is 6.8 ms or less. It becomes short. That is, the visual sensitivity of the human eye is 3
Among the wavelengths, green is excellent, and therefore the afterglow time of the green phosphor has a great influence when flicker is felt. And it is known that the afterglow time of the terbium-activated type is shorter than that of the manganese-activated type in the green-based phosphor. Easier to do.
Therefore, when such a phosphor is used, it is possible to prevent the occurrence of flicker by performing high frequency lighting.

According to the invention of claim 4, the total amount of phosphors is 2
Since 0% by weight or more is used as a terbium-activated green phosphor,
For the same reason as above, the afterglow time of the green phosphor has a great influence on the flicker, so that the flicker suppressing effect becomes large when the terbium-activated green phosphor having a short afterglow time is used. According to the fifth and sixth aspects of the present invention, it is possible to provide a lighting device and a bulb-type fluorescent lamp with less flicker.

[Brief description of drawings]

FIG. 1 is a perspective view of a fluorescent lamp showing an embodiment of the present invention.

FIG. 2 is a front view of an illumination device using the fluorescent lamp of the embodiment as a light source.

FIG. 3 is a configuration diagram showing a fluorescent lamp and a high-frequency lighting circuit of the same embodiment.

FIG. 4 is a spectral distribution characteristic diagram of the fluorescent lamp of the same embodiment.

FIG. 5 is a sectional view of a bulb-type fluorescent lamp showing another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Bulb 4 ... Electrode 5 ... Phosphor coating 10 ... Fluorescent lamp 20 ... Lighting fixture body 21 ... Lamp socket 22 ... High frequency lighting circuit 25 ... Commercial power supply 50 ... Light bulb type fluorescent lamp

Claims (6)

[Claims] 1. The bulb has an emission peak in at least three wavelength regions of red, green and blue, and has an afterglow time of 6.8.
1. A fluorescent lamp device comprising: a fluorescent lamp having a phosphor coating using a phosphor of ms or less; and a high frequency lighting device for lighting the fluorescent lamp at a frequency of 20 kHz or higher. 2. The bulb has an emission peak in at least three wavelength bands of red, green and blue, and has an afterglow time of 6.8.
A fluorescent lamp device comprising: a fluorescent lamp having a phosphor coating formed of a phosphor of ms or less; and a high-frequency lighting device for lighting the fluorescent lamp at a frequency of 40 kHz or higher. 3. The phosphor coating having an emission peak in at least three wavelength bands of red, green and blue is characterized in that the phosphor emitting green light is a terbium activated green phosphor. The fluorescent lamp device according to claim 1 or 2. 4. The phosphor coating having an emission peak in at least three wavelength ranges of red, green and blue is 20% of the whole phosphor.
The fluorescent lamp device according to any one of claims 1 to 3, wherein the above is a terbium-activated green phosphor. 5. A lighting device comprising: the fluorescent lamp device according to claim 1; and a lighting fixture main body in which the fluorescent lamp device is incorporated. 6. A cover having a screw-type base at one end, and light emitted in at least three wavelength bands of red, green and blue on the inner surface of a bulb attached and bent to the other end of the cover. A fluorescent lamp having a peak and having an afterglow time of 6.8 ms or less, formed with a phosphor coating, and a high-frequency lighting device housed in the cover for lighting the fluorescent lamp at a frequency of 20 kHz or higher; A bulb-type fluorescent lamp comprising: