JPH0982281A - Fluorescent lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively improve the brightness of the afterglow of a phosphor screen at the time of turning off power by forming a layer near a bulb mainly out of a long-persistence layer among the luminous layers made of a phosphor, and stacking an ordinary luminous layer on the long-persistence layer. SOLUTION: A reflecting layer 2 is formed on the inner surface of a bulb 1 at the prescribed angular aperture of θ and, therefore, light emitted from an aperture 2a is a synthesis of direct light from the first and second luminous layers 3 and 4, and reflected light emitted from the reflecting layer 2 through a reflection process. As a result, the brightness of the aperture 2a increases along a normal line, and an afterglow at the time of turning off power extends. In particular, the first luminous layer 3 is stacked on the reflecting layer 2, and has a sufficient amount of a long-persistence phosphor deposited. Thus, emitted light at the time of turning off power is discharged from the aperture 2a in a concentrated form, thereby providing a bright afterglow.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent lamp, and more particularly, to an improvement of a fluorescent lamp that exhibits afterglow capable of identifying an object even after 10 minutes or more have passed since the lamp was turned off.

[0002]

2. Description of the Related Art Generally, a fluorescent lamp for illumination is constructed by forming a light emitting layer made of a halophosphate phosphor, a rare earth phosphor or the like on the inner surface of a glass bulb.

For example, in a straight tube 40 watt type fluorescent lamp using a halophosphate phosphor, 2700 to 310 are used.
The brightness of 0 (lm) is obtained, and it is used not only in offices but also in large fields such as large stores, theaters, bathhouses, and underground malls.

In particular, in a large store, a theater, an underground mall, etc. where many people gather, it is necessary to evacuate safely and quickly even if a power failure occurs due to a disaster such as a fire or an earthquake.

Therefore, according to the Fire Defense Law and the Building Standards Law, in addition to general lighting fixtures, large-scale stores, theaters, underground malls, etc. that have a certain space or more and meet a large number of people It is obligatory to install lights and emergency lights.

[0006] For these guide lights and emergency lights, for example, the fluorescent lamp is turned on by a commercial power supply in a normal state, and the illuminance of a fluorescent lamp or a bulb is 1 (Lx) using an internal battery as a power supply in an emergency (during a power failure). The lamp is turned on for at least 20 to 30 minutes.

Therefore, in the event of a disaster such as an earthquake or fire, even if the commercial power supply is cut off and general lighting equipment is turned off, the illuminance on the floor is at least 1 (Lx) or more. Therefore, safe and quick evacuation is possible.

However, since these guide lights and emergency lights are expensive, the number of installations thereof is smaller than that of general lighting equipment. For example, in the case of being placed below a wall, such as a guideway light, if it is congested, there is a significant difference in visibility of the guideway light between people close to the wall and people far away. The effect will appear.

On the other hand, in a general home where there is no duty to install a guide light or an emergency light, when a power failure occurs due to a disaster, it is not easy to evacuate smoothly and quickly in the dark, and evacuation of children and the elderly is difficult. May be delayed.

[0010]

Therefore, the applicant of the present invention is
First, in the fluorescent lamp having the first and second light emitting layers made of one or more phosphors on the inner surface of the glass bulb, the first light emitting layer near the glass bulb has a long afterglow property. It is made of phosphor, and the amount of adhesion is at least 1.
A fluorescent lamp set at 0.2 mg or more per cm ² was proposed.

According to this proposal, by using this fluorescent lamp in the same manner as a general fluorescent lamp for illumination, even if 500 seconds have passed since the fluorescent lamp was turned off, an illuminance that enables object identification can be obtained. Therefore, it has a function similar to a guide light and a function like a night light during a power failure.

[0012] However, the brightness when the light is turned off is only to the extent that it is possible to discriminate the object, and it is much darker than the brightness when it is normal, which is unsatisfactory in achieving a smoother and quicker evacuation. Sufficient and higher afterglow brightness is desired.

Moreover, since the brightness of this fluorescent lamp under normal conditions is smaller than that of general fluorescent lamps for illumination, it is necessary to increase the number of lighting fixtures installed in order to satisfy a predetermined floor surface illuminance. However, there is also a problem that the financial burden increases.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a fluorescent lamp which can effectively improve not only the brightness at the normal time but also the afterglow brightness at the time of turning off by a relatively simple structure. .

[0015]

Therefore, in order to achieve the above-mentioned object, the present invention forms a reflective layer with an opening angle of a predetermined angle on the inner surface of a glass bulb, and at least one kind or a reflective layer is formed on the reflective layer. In a fluorescent lamp having a light emitting layer formed of two or more kinds of phosphors, the first light emitting layer includes a first light emitting layer and a second light emitting layer, and a first light emitting layer close to a glass bulb side.
The light-emitting layer is mainly composed of a phosphor having a long afterglow property.
The second light-emitting layer laminated on the light-emitting layer is formed of a normal phosphor, and the second invention of the present invention is:
The adhered amount of the phosphor having a long afterglow property in the first light emitting layer is set to 0.2 mg or more per cm ² .

A third invention of the present invention is that the first light emitting layer is formed of a plurality of phosphors including a phosphor having a long afterglow property, and a fourth invention is The second light emitting layer is formed of one kind or two or more kinds of rare earth phosphors, and a fifth invention is to provide the first and second light emitting layers on an inner surface of a glass bulb including a reflecting layer. It is characterized in that the first light emitting layer is formed mainly of a phosphor having a long afterglow property.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS. In the figure, 1 is a glass bulb, the inner surface of which has an opening angle θ of a predetermined angle.
Thus, the reflective layer 2 is formed. The reflective layer 2 is made of a light-reflective material such as titanium oxide (TiO ₂ ), and the opening angle θ thereof is set to 120 degrees, for example. It can be set to an appropriate opening angle. Then, the first light emitting layer 3 is formed on the inner surfaces of the reflective layer 2 and the opening portion (portion where the reflective layer 2 is not formed) 2a. The light-emitting layer 3 is mainly composed of a phosphor having a long afterglow property, and the adhered amount thereof is set to 0.2 mg or more per cm ² .

As the above-mentioned phosphor having a long afterglow property,
For example, the compound represented by the general formula MAl ₂ O ₄ , M is a phosphorescent phosphor having a mother crystal of a compound consisting of one or more metal elements selected from the group consisting of calcium, strontium and barium, Europium (Eu) is used as the activator, and dysprosium (Dy), neodymium (Nd) or the like is used as the coactivator. The average particle size of this phosphor is, for example, 2 to 12 μm (FSSS.
-It is set to "Fisher / Sub / Sheave / Size".

The first light emitting layer 3 has one or more kinds of fireflies.
A second light emitting layer 4 made of an optical body is laminated. This first
The light emitting layer 4 of 2 is, for example, a halophosphate phosphor (Ca
_Ten(PO _Four )₆ FCl: Sb / Mn etc.) and rare earth fluorescence
Body (Y₂ O_Three : Eu, LaPO_Four: Ce / Tb, (Sr
CaBaMg)_Five (PO_Four )_Three Cl: Eu, etc.)
It is formed of one kind or a mixture of two or more kinds. these
In forming the light emitting layers 3 and 4, the second light emitting layer 4 is formed.
When the first light emitting layer 3 is formed, the coating direction when forming the first light emitting layer 3
By setting the direction opposite to the coating direction, the overall film thickness can be compared.
It can be made relatively uniform. In addition, 5 is on both ends of the glass bulb 1.
The electrodes are arranged.

According to this embodiment, since the reflection layer 2 is formed on the inner surface of the glass bulb 1 with the opening angle θ of a predetermined angle, the light emitted from the opening 2a is the first and second light.
The direct light from the light emitting layers 3 and 4 and the reflected light emitted by being reflected by the reflective layer 2 are combined. For this reason, the brightness (luminance) in the normal direction of the opening 2a is 130 to
It increases to about 170%, and the afterglow brightness when the light is turned off also increases. Therefore, quick and accurate guidance is possible especially in an emergency.

Of the at least first and second light emitting layers 3 and 4 formed in a laminated state on the inner surface of the glass bulb 1,
The second light-emitting layer 4 on the discharge path side is composed of a phosphor used in a general fluorescent lamp for illumination, such as a rare earth phosphor, so that when the lamp is turned on, it is exposed to ultraviolet rays of 253.7 nm or the like. It can be excited efficiently and the brightness can be greatly increased.

In particular, the first light emitting layer 3 is formed by laminating it on the reflective layer 2 and the amount of the phosphor having a long afterglow is set to 0.2 mg or more per cm ² . Then, the radiated light when the fluorescent lamp is turned off is emitted in a state of being collected from the opening 2a. Therefore, a bright afterglow is obtained, and it becomes easier to identify the object for a long time. Therefore, if it is applied to general lighting equipment in places where guidance lights and emergency lights are required to be installed by the Fire Defense Law and Building Standards Law and lighting equipment for general households, even if a power failure occurs due to a disaster,
It will be possible to evacuate smoothly and quickly.

Further, a home lighting fixture is equipped with a miniature ball of about 5 W for a night light, but if the fluorescent lamp of the present invention is used, the miniature ball can be omitted and the cost of the fixture can be reduced. In addition, power saving is possible.

FIG. 3 shows another embodiment of the present invention.
So, the inner surface of the glass bulb 1 has a transparent ultraviolet light.
The line reflection layer 6 is formed. This ultraviolet reflective layer 6 is
For example, the average particle size is 0.1 μm or less, preferably 30 to 50
mμm alumina (Al₂ O _Three ), Magnesia (Mg
O) or the like. On this UV reflective layer 6
The reflective layer 2 and the first and second light emitting layers 3 and 4 are laminated on the
This configuration is the same as in FIG.

By the way, the first and second light emitting layers 3 and 4 are excited by ultraviolet rays of 253.7 nm or the like generated by the discharge between the electrodes, but the phosphors located on the discharge path side are efficiently excited. However, the excitation efficiency of the phosphor located on the glass bulb side away from the discharge path tends to decrease. However, according to this embodiment, the first and second
Since the ultraviolet rays transmitted through the light emitting layers 3 and 4 are reflected by the ultraviolet reflecting layer 6, the phosphor located on the glass bulb side is excited by the ultraviolet rays at the time of transmission and the reflected ultraviolet rays. Therefore, luminous efficiency can be improved.
In addition, in particular, if the ultraviolet reflection layer 6 is formed after the formation of the reflection layer 2, the above-mentioned effect can be further enhanced.

The ultraviolet reflecting layer 6 made of alumina, for example.
By forming the above, since the contact of mercury with the glass bulb 1 can be suppressed, discoloration due to solarization can be prevented or reduced. In particular, when the conductive coating 6 is formed on the inner surface of the glass bulb 1, it is possible to prevent or reduce the snag phenomenon caused by the contact of mercury with tin of the coating 6 and improve the appearance of the fluorescent lamp. it can.

FIG. 4 shows a further different embodiment of the present invention, in which a protective layer 7 is formed on the outer peripheral surface of the glass bulb 1. The protective layer 7 is made of a resin material such as polyethylene terephthalate (PET),
The thickness is set to 100 to 150 μm, for example. This protective layer 7 is preliminarily formed in a tube shape, and after inserting the glass bulb 1 therein, 150 to 200
It is formed by heating the glass bulb 1 to shrink it, and bringing it into close contact with the outer peripheral surface of the glass bulb 1. In particular, if an ultraviolet absorbing material such as titanium oxide (TiO ₂ ) is mixed in the protective layer 7, not only can the light resistance of the protective layer 7 be improved, but it also functions as an ultraviolet ray blocking layer. The configuration of this embodiment is shown in FIG.
It can also be applied to the fluorescent lamp shown in.

According to this embodiment, since the protective layer 7 made of resin or the like is formed on the outer peripheral surface of the glass bulb 1,
In an emergency, even if the glass bulb 1 is broken, not only the scattering can be prevented, but also the illuminance enough to identify the object in the broken state can be obtained. Therefore, it is possible to evacuate smoothly and quickly.

Furthermore, if this fluorescent lamp is detached from the lighting fixture, it can be used as a substitute for a flashlight, so it is presumed that it exerts irresistible power not only in guiding evacuation but also in various aspects. .

The present invention is not limited to the above-mentioned embodiment at all. For example, a fluorescent lamp may be a straight tube fluorescent lamp other than a 40 watt type fluorescent lamp, or a ring fluorescent lamp.
It can also be applied to compact fluorescent lamps and compact fluorescent lamps. Examples of the phosphor having a long afterglow include those described in the above examples, as well as europium, neodymium, and yttrium-activated calcium aluminate phosphors (CaAl ₂ O ₄ :
Any material having a long afterglow characteristic such as Eu / Nd / Y) can be used. In the three-wavelength fluorescent lamp, among the three or more types of phosphors in the second light emitting layer,
One or more types can be replaced with a phosphor having a long persistence. Further, the first light emitting layer may be composed of a plurality of phosphors having a long afterglow property, or may be composed by appropriately mixing a phosphor other than the phosphor having a long afterglow property. Further, although the first and second light emitting layers are formed in the opening 2a, it is also possible to stack the layers only on the reflective layer and not form the light emitting layer in the opening.

[0031]

Next, an experimental example will be described. The FL40 having the structure shown in FIG. 1 in which the opening angle θ of the reflective layer is set to 125 degrees.
In the S fluorescent lamp, 490n as the first light emitting layer 3
europium and dysprosium activated strontium aluminate phosphor (Sr ₄ Al ₁₄ O) having a light emitting peak at m
₂₅ : Eu / Dy) and used as the second light emitting layer 45.
3nm to emission peak - yu having click - europium activated strontium phosphate, calcium barium magnesium phosphor _{((SrCaBaMg) 5 (PO 4} ) 3 Cl: E
u) and a cerium- and terbium-activated lanthanum phosphate phosphor (LaPO ₄ : Ce) having an emission peak at 544 nm.
/ Tb) and a europium-activated yttrium oxide phosphor (Y ₂ O ₃ : Eu) having an emission peak at 612 nm in a weight ratio of 43.9%, 23.9%, and 32.2%. The mixture used was a ratio. In addition, the adhesion amounts of the first and second light emitting layers were 3.2 and 2.7 mg / cm ² , respectively.

When various characteristics of this fluorescent lamp were measured, the luminous intensity (A) directly below the opening 2a in the normal direction was 390 (cd) as shown in FIG. This was 140% of the conventional fluorescent lamp (B) in which the first light emitting layer 3 was not provided. Also, the illuminance (afterglow characteristics) with respect to the elapsed time after the light is turned off.
Is shown in FIGS. Note that FIG. 7 is almost the same as FIG. 6, except that the illuminance scale on the vertical axis is enlarged. As is clear from FIGS.
Even after a lapse of seconds, the afterglow illuminance at a point 10 mm away from the lamp is 0.25 (Lx), and it is presumed that objects can be sufficiently identified and smooth evacuation is possible.

[0033]

As described above, according to the present invention, since the reflection layer is formed on the inner surface of the glass bulb 1 with the opening angle θ of a predetermined angle, the light emitted from the opening is the first light. , The direct light from the second light emitting layer and the reflected light reflected and emitted by the reflective layer are combined. Therefore, not only the brightness in the normal direction of the opening but also the afterglow brightness when the light is turned off can be increased. Therefore, it can be effectively used as a guide light especially in an emergency or as a light of a night light.

Further, among the at least first and second light emitting layers formed in a laminated state on the inner surface of the glass bulb 1, the second light emitting layer on the discharge path side is a general illumination such as a rare earth phosphor. Since it is composed of a phosphor used in a fluorescent lamp for use in a vehicle, it can be efficiently excited by ultraviolet rays of 253.7 nm or the like when the lamp is turned on, and the brightness can be greatly increased.

In particular, the first light-emitting layer is formed by laminating it on the reflective layer, and the amount of the phosphor having a long afterglow is 1 or less.
Since it is set to 0.2 mg or more per cm ² ,
The emitted light when the fluorescent lamp is turned off is emitted in a state of being collected from the opening. Therefore, a bright afterglow is obtained, and it becomes easier to identify the object for a long time. Therefore, if it is applied to general lighting equipment in places where guidance lights and emergency lights are required to be installed by the Fire Defense Law and Building Standards Law and lighting equipment for general households, even if a power outage occurs due to a disaster, etc., it will be smooth and prompt. Evacuation is possible.

Further, if a protective layer made of resin or the like is formed on the outer peripheral surface of the glass bulb, not only can the glass bulb be prevented from scattering in the event of an emergency, but it is also possible to protect the material in the damaged state. It gives a recognizable level of illuminance, and can be used as a substitute for a flashlight by removing it from the lighting fixture.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.

FIG. 2 is a side sectional view of FIG.

FIG. 3 is a longitudinal sectional view showing a second embodiment of the present invention.

FIG. 4 is a longitudinal sectional view showing a third embodiment of the present invention.

FIG. 5 is a diagram showing light distribution characteristics.

FIG. 6 is a diagram showing afterglow illuminance with respect to an elapsed time after turning off the light.

FIG. 7 is an enlarged view of the illuminance scale of FIG.

[Explanation of symbols]

 1 Glass Bulb 2 Reflective Layer 2a Opening 3 First Light Emitting Layer 4 Second Light Emitting Layer 5 Electrode 6 Ultraviolet Reflecting Layer 7 Protective Layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Norimasa Mizobe 1-4-24 Jomi, Chuo-ku, Osaka-shi, Osaka NEC Home Electronics Co., Ltd.

Claims (5)

[Claims] 1. A fluorescent lamp in which a reflective layer is formed on an inner surface of a glass bulb with an opening angle of a predetermined angle, and a light emitting layer made of at least one kind of phosphor is formed on at least the reflective layer. The layer is composed of a first light emitting layer and a second light emitting layer, and the first light emitting layer near the glass bulb side is laminated on the first light emitting layer mainly by a phosphor having a long afterglow property. A fluorescent lamp in which the second light-emitting layer is formed of an ordinary phosphor, respectively. 2. The fluorescent lamp according to claim 1, wherein the adhered amount of the phosphor having a long afterglow property in the first light emitting layer is set to 0.2 mg or more per cm ² . 3. The fluorescent lamp according to claim 1, wherein the first light emitting layer is formed of a plurality of phosphors including a phosphor having a long afterglow property. 4. The fluorescent lamp according to claim 1, wherein said second light emitting layer is formed of one or more rare earth phosphors. 5. The first and second light emitting layers are formed on an inner surface of a glass bulb including a reflective layer, and the first light emitting layer is mainly formed of a phosphor having a long afterglow property. The fluorescent lamp according to claim 1.