JPH05275071A - Fluorescent lamp - Google Patents

Abstract

PURPOSE:To prevent a nonuniformity phenomenon, and to reduce starting voltage by preventing concentration of electric fields on the boundary parts between a notched part and a phosphor layer. CONSTITUTION:Mercury particles are filled and sealed into an internal space 15 of a straight glass tube 12 and a fluorescent lamp 11 is formed. A transparent conductive film 21 is formed on the inner surface of the glass tube 12, and a phosphor layer 22 is formed on the inner surface of the transparent conductive film 21. A linear band-shaped notched part 24 is formed on the phosphor layer 22 in the longitudinal direction of the glass tube 12, and the transparent conductive film 21 is exposed to the internal space 15 of the glass tube 12. A copper foil tape 27 (conductor) is adhered to the outer surface of the glass tube 12 by using a conductive adhesive agent 29 so that the notched part 24 is covered by the tape. The conductive adhesive agent 29 is formed out of acrylic adhesive agent with which metal particles of copper and nickel are mixed together.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rapid start type fluorescent lamp.

[0002]

2. Description of the Related Art Conventionally, in a fluorescent lamp provided with a phosphor layer on the inner surface of a glass tube, a transparent conductive film (EC film) is provided between the inner surface of the glass tube and the phosphor layer in order to shorten the starting time. A so-called rapid start type fluorescent lamp, which is provided with a conductive strip on the outer surface of the glass tube, is used.

In a fluorescent lamp provided with a transparent conductive film, the thermoelectrons emitted from the negative electrode reach the positive electrode via the transparent conductive film when the fluorescent lamp is started,
Since the discharge path is formed, the starting time of the fluorescent lamp can be shortened.

However, in such a fluorescent lamp provided with a transparent conductive film, the fluorescent lamp is lit for a long time.
There is a problem that a so-called pockmark phenomenon (EC blackening) occurs, in which minute discharge occurs between mercury particles inside the glass tube and the transparent conductive film, and the phosphor layer is blackened in a spotted manner due to dielectric breakdown or the like. have.

In order to prevent such pockmark phenomenon, for example, as described in Japanese Utility Model Publication No. 39-35033, a part of the phosphor layer is removed to form a band-shaped notch. , A structure in which the potential of the inside of the glass tube and the potential of the transparent conductive film are made to be equal via this notch,
As described in Japanese Patent No. 93656, a structure has been proposed in which a depression is formed in a part of the phosphor layer and the breakdown voltage is reduced by this depression.

Further, in a fluorescent lamp having a conductive strip on the outer surface of a glass tube, for example, Japanese Patent Application Laid-Open No. 51-78588.
As described in Japanese Patent Publication, a conductive coating film is formed on one surface of a plastic strip, and a strip-shaped activation linear article in which an adhesive is applied to the conductive coating film is used. A configuration has been proposed in which the glass tube is attached to the outer surface of the glass tube along the longitudinal direction.

[0007]

However, in the structure described in Japanese Utility Model Publication No. 39-35033, the fluttering phenomenon does not occur except around the notch portion where the phosphor layer is removed. There is a problem that the part becomes a problem in appearance and the luminous flux of the lamp is also reduced. Further, since the electric field is concentrated on the boundary between the notch and the phosphor layer, there is a problem that many patters are concentrated on this boundary.

Also, in the structure disclosed in the above-mentioned Japanese Patent Laid-Open No. 55-93656, in addition to the problem of appearance, there are problems of uneven brightness and reduction of luminous flux of the lamp.
Further, there are problems that stable production is difficult and production efficiency is poor.

Further, in the structure described in Japanese Patent Laid-Open No. 51-78588 mentioned above, since the insulating adhesive is present between the conductive coating of the starting filament and the glass tube, the starting voltage is increased. There is a problem that the decrease of is not sufficient.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rapid start type fluorescent lamp that has a low patter phenomenon and a low starting voltage.

[0011]

According to a first aspect of the present invention, there is provided a fluorescent lamp including: a lamp bulb; a transparent conductive film provided on an inner surface of the lamp bulb; and a phosphor layer provided on an inner surface of the transparent conductive film. A notch portion provided on the phosphor layer to expose the transparent conductive film inside the lamp bulb, and a conductor provided outside the lamp bulb so as to cover the notch portion. ..

A fluorescent lamp according to a second aspect of the present invention is the fluorescent lamp according to the first aspect, wherein a conductor is attached to the outer surface of the lamp bulb with a conductive adhesive.

[0013]

In the fluorescent lamp according to the first aspect of the present invention, the starting time is shortened because the transparent conductive film serving as a discharge path at the time of starting is provided on the inner surface of the lamp bulb. Since the transparent conductive film is exposed inside the lamp bulb by providing the notch in the phosphor layer and the conductor is provided outside the lamp bulb so as to cover the notch, the potential inside the lamp bulb and the transparent conductive film The potential difference with respect to the potential is reduced, and the electric field is prevented from concentrating on the boundary portion between the phosphor layer and the notch, and the patter phenomenon is prevented from occurring.

In the fluorescent lamp according to the second aspect, since the conductor is adhered to the outer surface of the lamp bulb with the conductive adhesive, in addition to the function of the fluorescent lamp according to the first aspect, the phosphor layer and the notch portion are formed. The concentration of the electric field at the boundary is weakened to prevent the occurrence of the pockmark phenomenon, and the starting voltage of the fluorescent lamp is lowered.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of one embodiment of the fluorescent lamp of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, 11 is the rated power 4
This is a 0 W straight tube type fluorescent lamp. This fluorescent lamp 11 has a longitudinal dimension of about 1200 mm and a tube diameter of about 32.5 mm, and both ends of a straight tube-shaped glass tube 12 as a lamp bulb are sealed to form a base 14. It is attached and is configured by enclosing mercury particles in the internal space 15.

A filament coil 16 is provided inside each of the ferrules 14, and a pair of ferrule pins 18 connected to a socket or the like (not shown) is provided outside the ferrules 14, respectively.

On the inner surface of the glass tube 12, a transparent conductive film (EC) of one or more layers made of metal oxide or the like is formed.
A coating film 21 is formed, and a phosphor layer 22 is formed on the inner surface of the transparent conductive film 21.

Then, the phosphor layer 22 is formed on the glass tube 12 at a position 15 cm apart from both ends of the glass tube 12.
Along the longitudinal direction of 12, strips each having a length dimension of 10 cm and a width dimension of 3 mm are peeled off to form a pair of linear strip-shaped notches 24.
Is formed, and the transparent conductive film is formed through the cutout portion 24.
21 is exposed in the internal space 15 of the glass tube 12.

The cutout 24 is formed on the opposite side of the fluorescent lamp 11 from which the lamp mark is formed, and in the direction perpendicular to the line connecting the base pins 18.

Furthermore, on the outer surface of the glass tube 12,
A copper foil tape 27 as a conductor is provided so as to cover the cutout portion 24. This copper foil tape 27 has a width of 1 cm,
As shown in FIG. 3, a conductive adhesive 29, such as an acrylic adhesive mixed with metal particles such as copper and nickel, is used to adhere to the outer surface of the glass tube 12.

In the fluorescent lamp 11 of this embodiment, since the transparent conductive film 21 is formed on the inner surface of the glass tube 12, the thermoelectrons emitted from the filament coil 16 serving as the negative electrode when the fluorescent lamp 11 is started. Reaches the filament coil 16 that becomes the positive electrode through the transparent conductive film 21,
Since the discharge path is formed, the starting time of the fluorescent lamp 11 can be shortened.

Further, since the notch 24 is formed in the phosphor layer 22, as shown in FIG. 4, the mercury ion H passes through the notch 24.
Electrons are transferred between g ⁺ and the transparent conductive film 21, and the mercury ions Hg ⁺ are present as charge-stable mercury Hg. Further, as shown in the equivalent circuit diagram of FIG. 5, since the capacity of the pseudo capacitor formed by the transparent conductive film 21 and the phosphor layer 22 increases, the potential difference between both ends of this pseudo capacitor is increased. Vc decreases. In the figure, D indicates the positive column voltage.

Therefore, the minute discharge E as shown in FIG. 6 which is generated between the mercury ion Hg ^{+ in the} internal space 15 and the transparent conductive film 21 through the phosphor layer 22 is reduced, and the phosphor layer 22 Even if the fluorescent lamp 11 is turned on for a long time, it is possible to prevent a so-called fluttering phenomenon, which is a speckled blackening, by preventing dielectric breakdown or the like.

Further, since the copper foil tape 27 is attached to the outer surface of the glass tube 12 with the conductive adhesive 29 so as to cover the cutout portion 24, the transparent conductive film 21 and the copper foil tape 27 around the cutout portion 24 are attached.
And, because they are coupled as a capacitor via the glass tube 12, it is possible to prevent the electric field from concentrating in the boundary portion between the cutout portion 24 and the phosphor layer 22, it is possible to prevent the occurrence of flapping phenomenon, The starting voltage can be reduced.

Since the copper foil tape 27 is non-translucent, the copper foil tape 27 can cover the cutout portion 24 to have a good appearance, and can be mounted on the socket of the fluorescent lamp 11 because it is located on the back surface of the fluorescent lamp 11. It also has the function of indicating the direction.

According to the experiment, even if the fluorescent lamp 11 of the present embodiment was turned on for 10,000 hours or more, no pockmark phenomenon was observed. Further, the lamp characteristics are almost the same as those of the fluorescent lamp in which only the transparent conductive film 21 is formed without providing the cutout portion 24 and the copper foil tape 27, and due to reflection by the copper foil tape 27, a decrease in the lamp luminous flux is almost recognized. There wasn't.

The cutout portion 24 of the phosphor layer 22 is a glass tube.
Even if the glass tube 12 is not provided over the entire length of the glass tube 12 and is provided at a position of about 10 cm to 30 cm from both ends of the glass tube 12 where the pitting phenomenon is likely to occur, the pitting phenomenon can be effectively prevented.

Next, the structure of another embodiment of the fluorescent lamp of the present invention will be described with reference to FIG.

The fluorescent lamp 31 of this embodiment is similar to the fluorescent lamp 11 of the above embodiment except that the notch 32 of the phosphor layer 22 is
3mm width along the length of the glass tube 12
This cutout is formed on the outer surface of the glass tube 12 as well.
A conductive strip 33 having a width of 8 mm is attached so as to cover 32.

The conductive strip 33 is formed by forming a vapor deposition surface of aluminum (Al) on one surface of a plastic tape, and the vapor deposition surface has conductivity and reflects light rays. Then, a pressure sensitive adhesive is applied on the vapor deposition surface, and the conductive strip 33 is made into a glass tube by this pressure sensitive adhesive.
Affixed to 12 outer surfaces.

In the state where the adhesive is removed, the conductive strip 33
When the electric resistance of the vapor deposition surface of was measured, it was several Ω / cm or less.

Also in the fluorescent lamp 31 of this embodiment, the internal space 15 of the glass tube 12 and the vapor deposition surface of the conductive strip 33 are
Since the capacitor is coupled via the glass tube 12 and the adhesive, it is possible to prevent the electric field from concentrating on the boundary between the notch 32 and the phosphor layer 22 and prevent the occurrence of the pockmark phenomenon. According to the experiment, the fluorescent lamp 31 of the present embodiment is
Even after lighting for 0000 hours or more, no pockmark phenomenon was observed. Further, the lamp characteristics are almost the same as those of the fluorescent lamp in which only the transparent conductive film 21 is formed without providing the cutout portion 32 and the conductive strip 33, and almost no reduction in the luminous flux of the lamp is recognized due to reflection by the vapor deposition surface of aluminum. It was

Next, the transparent conductive film 21 and the notch 32 are provided, and a non-translucent thin metal foil film is adhered or coated on the glass tube 12 as a conductor to form a conductor. Using a straight tube type fluorescent lamp (longitudinal dimension of about 1200 mm, tube diameter of about 32.5 mm) with power of 40 W, ambient temperature of 25 ° C., continuous lighting (lighting for 2 hours and 50 minutes, lighting for 10 minutes) Table 1 shows the results of the lighting test, in which the occurrence of the fluorescent lamp was examined and compared with a conventional fluorescent lamp provided with a transparent conductive film and not provided with a notch.

[0035]

[Table 1] The numerical values in this table are based on a 10-step evaluation, where 10 is a state where the fluttering phenomenon does not pose any problem in practical use, and the occurrence of the fluttering phenomenon occurs in the fluorescent lamp of this example as compared with the conventional fluorescent lamp. It was shown that it is hard to generate and has excellent characteristics.

Further, in this embodiment, since the discharge path is easily formed, the discharge stability at low temperature can be improved.

In each of the above embodiments, the glass tube
The outer surface of 12 can also be formed by applying a water-repellent silicon coating that prevents condensation and the like to increase impedance to facilitate discharge with a conductor and block ultraviolet rays. Also, together with this silicon coating or in place of this silicon coating, the conductors 27, 33
To cover the surface side of polytetrafluoroethylene,
A water-repellent and insulating water-repellent tape made of polyester or the like can also be attached.

By applying such a water-repellent tape, it is possible to suppress the rise of the starting voltage and keep it within the JIS standard even when the humidity is high outside. Then, by attaching a water repellent tape having a width sufficiently wider than that of the conductors 27 and 33, it becomes possible to omit the silicon coating even under a high external humidity condition.

As the conductor, in addition to the copper foil tape 27, the conductive strip 33, etc. shown in each of the above-mentioned embodiments, or those formed by coating, the conductive tape 41 shown in FIGS. 8 and 9 is used. It can also be used. In this conductive tape 41, a conductive or non-conductive adhesive 44 is applied on one surface of a conductive metal tape 42, and the metal tape 42 is cut and raised at a plurality of positions to form a contact piece 45. The contact piece 45 is folded back to the adhesive 44 side. In this conductive tape 41, a conductive metal tape 42 is provided on the adhesive 44 side.
Since the continuous contact piece 45 is exposed, even if the non-conductive pressure sensitive adhesive 44 is used, the same effect as when the conductive pressure sensitive adhesive is used can be obtained.

Further, in each of the above embodiments, the notch
The number of 24 is not limited to one, and a plurality of lines can be formed.

Next, a metal tape was used as a conductor, and a metal tape was applied to the outer surface of the glass tube of the fluorescent lamp using a conductive adhesive mixed with metal particles and a non-conductive adhesive, respectively. Table 2 shows the test results comparing the starting voltages of the fluorescent lamps when worn. The measured values in the table are
It is the average value of the measurement results of 10 times.

[0042]

[Table 2] The metal tape used in this test has a width of 4 mm, and both ends are adhered to the aluminum base of the fluorescent lamp. Also,
The base on one side is electrically connected to one side of the coil electrode via a resistor of about 2 MΩ. Further, a water-repellent silicon coating is applied and formed so as to cover the entire outer surfaces of the glass tube and the metal tape.

From the results of this test, when a non-conductive pressure sensitive adhesive was used as in the conventional case, the measurement temperature was 25 ° C.
However, when the conductive adhesive was used, both the measurement temperature of 5 ° C and 25 ° C met the JIS standard, and the conductive tape was used to attach the metal tape to the glass tube. It was shown that the starting voltage can be sufficiently reduced by sticking it on the outer surface.

In this test, a fluorescent lamp having no transparent conductive film formed on the inner surface of the glass tube was used.

Next, in the tests shown in Table 2 above, instead of the conductive adhesive and the metal tape, FIG. 8 and FIG.
Table 3 shows the test results using the non-conductive pressure sensitive adhesive 44 shown in FIG. 2 and the conductive tape 41 in which the contact piece 45 is folded back to the pressure sensitive adhesive 44 side. The other test conditions are the same as those shown in Table 2.

[0046]

[Table 3] Further, according to the test result, when the conductive tape 41 in which the contact piece 45 is folded back to the adhesive 44 side is used, even if the non-conductive adhesive 44 is used, the measurement temperature is 5 ° C. and 25 ° C. according to the JIS standard. Was satisfied, and it was shown that the starting voltage could be lowered sufficiently.

Next, in the tests shown in Tables 2 and 3 above, the test temperature was measured at 25 ° C. and only the external humidity was changed to measure the starting voltage of the fluorescent lamp. Shown in.

The vertical axis of the graph is the starting voltage [V] of the fluorescent lamp, and the horizontal axis is the external humidity [%].

The broken line a indicates that, in the fluorescent lamp used in the test shown in Table 2, the glass tube and the metal tape were not formed with a water-repellent silicon film, and the metal tape having a width of 4 mm was used as the water-repellent tape. It is a graph of the fluorescent lamp which was not covered with.

The broken line b represents the test result of the fluorescent lamp used in the test shown in Table 2 in which the glass tube and the metal tape are covered with a water-repellent silicon film.

The solid line c indicates that in the fluorescent lamp used in the test shown in Table 3, the metal tape is covered with a water-repellent tape made of polytetrafluoroethylene having a water-repellent and insulating property of 8 mm width. 7 is a graph of a fluorescent lamp having a water-repellent silicon film formed thereon.

The solid line d is a graph of the fluorescent lamp used in the test shown in Table 2 in which the metal tape is covered with an 8 mm wide water repellent tape without forming a water repellent silicon film. Is.

From these test results, the starting voltage of the fluorescent lamp rises as the external humidity rises,
In particular, when neither the silicon coating nor the water-repellent tape is used (broken line a), the starting voltage rises sharply at a humidity of about 70% and the JIS standard cannot be satisfied. It was found that by covering the metal tape with a water-repellent silicon coating or by covering the metal tape with a water-repellent tape having a width of 8 mm, it is possible to suppress an increase in the starting voltage and satisfy the JIS standard at least at a humidity of 90% or less.

Next, in the test shown in the graph of FIG. 10 described above, a water-repellent tape was used to form 4 without forming a silicon film.
In a test example in which a metal tape having a width of mm is covered, the humidity is kept constant and the width dimension of the water-repellent tape is changed, and the test result of measuring the starting voltage of the fluorescent lamp is shown in the graph of FIG.

The vertical axis of the graph is the starting voltage [V] of the fluorescent lamp, and the horizontal axis is the protruding width [mm] of the water-repellent tape on both sides of the metal tape.

From this test result, the larger the protrusion width, the greater the effect of lowering the starting voltage. If a water repellent tape having a sufficient width dimension is used, it is not necessary to form a silicon film, but It has been found that the same width dimension as the tape does not have the effect of lowering the starting voltage.

The water-repellent tape covering the metal tape is
The same effect can be obtained with a tape having water repellency and insulation such as a polyester tape.

[0058]

According to the fluorescent lamp of the first aspect, since the transparent conductive film serving as the discharge path at the time of starting is provided on the inner surface of the lamp bulb, the starting time can be shortened. Since the transparent conductive film is exposed inside the lamp bulb by providing the notch in the phosphor layer and the conductor is provided outside the lamp bulb so as to cover the notch, the potential inside the lamp bulb and the transparent conductive film It is possible to reduce the potential difference with respect to the potential and to prevent the electric field from concentrating on the boundary portion between the phosphor layer and the cutout portion, thereby preventing the fluttering phenomenon from occurring.

In the fluorescent lamp according to the second aspect, the conductor is adhered to the outside of the lamp bulb with the conductive adhesive, so that in addition to the effect of the fluorescent lamp according to the first aspect, the fluorescent layer and the cutout portion are formed. The concentration of the electric field at the boundary portion can be weakened to prevent the occurrence of the pockmark phenomenon, and the starting voltage of the fluorescent lamp can be lowered.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a fluorescent lamp of the present invention.

FIG. 2 is a perspective view of a part of the above fluorescent lamp.

FIG. 3 is a longitudinal sectional view of a part of the above fluorescent lamp.

FIG. 4 is an explanatory view showing the operation of the above fluorescent lamp.

FIG. 5 is an equivalent circuit diagram showing the operation of the above fluorescent lamp.

FIG. 6 is an explanatory view showing the operation of the above fluorescent lamp.

FIG. 7 is a partial perspective view showing another embodiment of the fluorescent lamp of the present invention.

FIG. 8 is a partial plan view showing another embodiment of the conductor of the fluorescent lamp of the present invention.

FIG. 9 is a sectional view of a part of the same conductor.

FIG. 10 is a graph showing the test results of measuring the starting voltage by changing the humidity outside the fluorescent lamp.

FIG. 11 is a graph showing the test results of measuring the starting voltage by changing the width dimension of the water-repellent tape covering the metal tape of the fluorescent lamp.

[Explanation of symbols]

 11 Fluorescent lamp 12 Glass tube as lamp bulb 21 Transparent conductive film 22 Phosphor layer 24 Notch 27 Copper foil tape as conductor 29 Conductive adhesive

Claims (2)

[Claims] 1. A lamp bulb, a transparent conductive film provided on the inner surface of the lamp bulb, a phosphor layer provided on the inner surface of the transparent conductive film, and the transparent conductive film provided on the phosphor layer. A fluorescent lamp comprising: a notch exposed inside the lamp bulb; and a conductor provided outside the lamp bulb so as to cover the notch. 2. The fluorescent lamp according to claim 1, wherein a conductor is adhered to the outer surface of the lamp bulb with a conductive adhesive.