JP2003123701A - Cold cathode fluorescent lamps and lighting devices - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the winding structure of a light-transmitting resin sheet formed so as to cover an outer electrode provided on an outer surface of a glass tube bulb having an aperture, thereby improving the outer electrode. It is an object of the present invention to provide a highly safe cold cathode fluorescent lamp which ensures insulation protection and prevents creeping discharge and electric shock accident, and a lighting device using the fluorescent lamp. SOLUTION: A phosphor coating 2 formed on an inner surface of a glass tube bulb 1 along an axis of a tube while leaving an aperture 2A, and a pair of strip-shaped outer surfaces arranged on an outer surface of the bulb 1 along the axis of the tube so as to be separated from each other. Electrodes 3A, 3B and translucent resin sheet 4
And a cold cathode cold cathode fluorescent lamp L1 including a translucent heat-shrinkable tube, and a holder joined to the translucent resin sheet 4 at the end of the bulb 1 via an adhesive, and using the fluorescent lamp L1. Lighting equipment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold cathode fluorescent lamp having an improved outer electrode covering structure of a cold cathode fluorescent lamp having an outer electrode which is widely used in office automation equipment and the like, and an illuminating device using the fluorescent lamp. .

[0002]

2. Description of the Related Art A general fluorescent lamp is a hot cathode having a phosphor coating on the inner surface of a glass tube bulb and having coiled filaments at both ends thereof, or a plate-shaped, cylindrical or cylindrical cold cathode, etc. The internal electrode made of is sealed, and a low-pressure rare gas and mercury, if necessary, are sealed in the bulb.

However, the lamp having such a structure requires a special electrode in the bulb, and needs an airtight structure for sealing the internal electrode. Therefore, the number of parts is large and the manufacturing cost is complicated and the manufacturing cost is low. Get higher In addition, this internal electrode may be a main factor affecting the life of the lamp, and the amount of light emitted from the bulb end portion where the electrode portion is located may be low.

Under these circumstances, instead of the internal electrodes, a band-shaped outer surface electrode is formed on the outer surface of the glass tube bulb along the bulb axis, and high-frequency power is supplied between these outer surface electrodes.
There is an external electrode type fluorescent lamp in which a high frequency discharge is generated in the bulb by this, and a rare gas is ionized and excited to emit a fluorescent substance.

In this external electrode type lamp, a pair of strip-shaped electrodes are formed along the bulb axis and a phosphor coating is applied along the bulb axis leaving an aperture (opening). It has an aperture shape.

The aperture type fluorescent lamp having such a structure is capable of reducing the deterioration of the phosphor coating, preventing an abnormal rise in the bulb temperature, and allowing the entire bulb to emit light, thereby providing a stable discharge. As a result, a sufficient luminous flux and good working characteristics (decrease of luminous flux due to lighting progress) are obtained, and a uniform light distribution is obtained from the aperture (opening) formed in the bulb axis direction, which is excellent in light emission characteristics. ing.

This external electrode type fluorescent lamp is
It is widely used as a light source for exposure of a copying machine, a facsimile, an image scanner or the like or a backlight of a liquid crystal display device because light having directivity and high efficiency is emitted from an aperture (opening).

The conventional aperture type fluorescent lamp has a structure as shown in FIGS. 6 to 8, for example. That is, FIG. 6 is a front view of the one-end-capacity fluorescent lamp L, and FIG.
6A is a cross-sectional view taken along the arrow cc line at the valve middle portion in FIG. 6, FIG. 8B is a cross-sectional view taken along the arrow dd line at the valve end, and FIG. It is a development view of the attached translucent resin sheet.

In this fluorescent lamp L, a rare gas containing xenon Xe as a main component is enclosed in a glass tube bulb B whose both ends are hermetically sealed, and the inner surface thereof extends along the longitudinal direction of the tube axis. A phosphor coating P is formed leaving an aperture (opening) A.

Aluminum Al is formed on the outer surface of the valve B.
A pair of strip-shaped outer electrodes E made of a conductor such as tape
1 and E2 are separated from each other, and the side edge thereof and the side edge of the aperture (opening) A are arranged so as to substantially correspond to each other.
This is because when the strip-shaped outer surface electrodes E1 and E2 enter into the aperture (opening) A, the light emission from the aperture (opening) A is blocked.

Further, R is a translucent resin sheet made of a fluororesin or the like, and the aperture (opening) A is provided in order to ensure the insulation protection of the outer electrodes E1 and E2 and prevent the creeping discharge and the electric shock accident. Except for the valve outer surface and outer surface electrode E
1, E2 surface is wrapped and adhered. The reason why the translucent resin sheet R is not provided in the aperture (opening) A is that when the lamp L is turned on for a long time, the adhesive agent such as silicone or acrylic resin formed on the resin sheet R is deteriorated by ultraviolet rays. This is to prevent the light transmittance from lowering due to the color change and the light emission amount from the aperture (opening) A from decreasing.

Further, the transparent resin sheet R including the outer electrodes E1 and E2 on the surfaces of the transparent resin sheet R and the aperture (opening) A except for the vicinity of the end portion of the bulb B.
Is covered with a translucent heat-shrinkable tube T made of a fluororesin that is flame-retardant and heat-resistant and has excellent electrical insulation so that it closely contacts the outer surface of the valve B. It is as shown in (a). In the figure, E and E
Is a conductive member connected to the ends of the outer electrodes E1 and E2.

The outer electrodes E1 and E2, the translucent resin sheet R and the heat-shrinkable tube T are formed first by
On the surface of the translucent resin sheet R on which the adhesive is formed, a pair of strip-shaped outer surface electrodes E1 and E2 are attached at approximately the same interval as the width of the aperture (opening) A.

Next, the translucent resin sheet R is wound around the outer surface of the bulb B, with the resin sheet R unfolded as shown in FIG. 8 and an aperture (opening) formed in the longitudinal direction of the glass tube bulb B. Part) A and the side edges of the outer surface electrodes E1 and E2 are positioned substantially parallel to each other, and the resin sheet R is attached to the outer peripheral surface of the valve B other than the aperture (opening) A by winding. I'm wearing it.

Further, a translucent heat-shrinkable tube T made of a fluororesin or the like having a diameter slightly larger than the outer diameter of the bulb 1 is wound around a portion of the bulb B excluding the vicinity of the end thereof, and the bulb T is heated. By contracting, the outer electrodes E1, E2
Is adhered to the surface of the translucent resin sheet R containing.

After this, the holder H has two kinds of adhesives on one end of the valve B (a silicone adhesive for long-term bonding on the bottom side of the holder H (for example, Shin-Etsu Chemical Co., Ltd .:
The product model number-KE-3490) has an adhesive such as a polyamide-based jet melt (Sumitomo 3M Co., Ltd .: product model number-JA-7375) that controls the initial joining on the opening side. ) And the conductive members E, E are connected to the power supply line F and the power supply terminal to form the fluorescent lamp L.

The reason why the end portion of the bulb B of the fluorescent lamp L is not covered with the heat-shrinkable tube T is that the fluorine-based resin has high chemical resistance and the bonding strength is weak no matter which adhesive is used. Usually 5 to 30 from the end of valve B
The heat-shrinkable tube T is not provided for about mm, and the surface portion of the translucent resin sheet R and the holder H portion are joined by the latter jet melt adhesive to obtain a strong joining strength.

However, the cross section of the vicinity of the end of the valve B which is not covered with the heat-shrinkable tube T is shown in FIG.
As shown in (b), the resin sheet R covering the vicinity of the end portions of the outer surface electrodes E1, E2 has a small amount of the vicinity X, Y (linear since it is in the axial direction) of the resin sheet R. When the holder H is joined with a jet melt adhesive, the adhesive penetrates into the outer surface electrodes E1 and E2 at the time of joining to cause dielectric breakdown, short-circuits between the outer surface electrodes E1 and E2, and the fluorescent lamp L becomes defective. There was a risk of becoming.

[0019]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a fluorescent lamp in which an outer surface electrode is provided on the outer surface of a glass tube bulb having an aperture formed along the tube axis so as to correspond to the aperture. In the above, by improving the winding structure of the translucent resin sheet formed so as to cover the outer surface electrode, it is possible to ensure the insulation protection of the outer surface electrode and to prevent a creeping discharge or an electric shock accident and a highly safe fluorescent lamp and It is an object of the present invention to provide an illumination device using this fluorescent lamp.

[0020]

The cold cathode fluorescent lamp according to claim 1 of the present invention comprises a glass tube bulb, a phosphor coating formed on the inner surface of the bulb along the tube axis leaving an aperture, and Excluding the discharge medium enclosed in the bulb, a pair of strip-shaped outer electrodes arranged apart from each other along the tube axis direction on the outer surface of the bulb excluding the portion corresponding to the aperture, and the portion corresponding to the aperture. A translucent resin sheet formed so as to cover the outer surface of the valve and the surface of the outer electrode and the entire peripheral surface of the valve end where the end of the outer electrode is located, and the valve corresponding to the above-mentioned aperture except the vicinity of the end of the valve. A light-transmitting heat-shrinkable tube formed to cover the outer surface portion and the resin sheet portion, and a holder joined to the light-transmitting resin sheet at the valve end portion with an adhesive agent. And wherein the Rukoto.

The fluorescent lamp having the outer electrode of the present invention is
Even if the holder is joined with an adhesive such as jet melt (Sumitomo 3M Co., Ltd .: product model number-JA-7375), the adhesive does not penetrate into the outer surface electrode portion and short-circuit between both outer surface electrodes. There are no defects in the lamp due to dielectric breakdown of the part.

Further, the resin sheet covering the aperture (opening) has only a very small area at the end, and the light transmittance is not deteriorated even if the adhesive due to the presence of the resin sheet is deteriorated and discolored by ultraviolet rays. Few.

Further, since the adhesive bonding area between the heat shrinkable tube and the holder is increased, the holder can be firmly bonded to the end portion of the valve.

In the present invention and the following inventions, the definitions and technical meanings of terms are as follows unless otherwise specified.

The cold cathode fluorescent lamp includes a lamp filled with mercury and a rare gas, and a lamp based on the emission of a rare gas not filled with mercury. The rare gas used as a discharge medium is xenon Xe or neon Ne. One or more kinds of rare gases such as krypton Kr and argon Ar may be enclosed. Further, the use of the lamp is not limited to the backlight, and it can be applied not only to the illumination but also to the display lamp.

The material of the glass tube bulb used in the present invention is soft glass such as soda lime glass or lead glass or quartz glass, or hard glass such as aluminosilicate glass or borosilicate glass. Further, the shape of the glass tube bulb is not limited to the straight tube shape, and the U-shaped, W-shaped,
It may be bent in a ring shape or a shape in which a plurality of straight pipes are connected in series, and a reflective coating may be formed on the inner surface or the outer surface of the bulb.

Further, as for the shape of the translucent resin sheet, even if the projecting piece is formed by extending both ends of the rectangular shape, the projecting piece is formed separately from the rectangular body and the projecting piece is formed. The strip may be wrapped around the end of the bulb.

Further, at least one pair of external electrodes are formed, and internal electrodes may be provided together. Further, the outer electrode is not limited to the aluminum tape, but a thin metal plate such as aluminum Al, nickel Ni, gold Au, platinum Pt, silver, or a good conductive metal material such as silver / platinum Ag / Pt alloy in a tape or foil shape. It may be a body or a thin plate such as a tape or foil formed or attached by vapor deposition or printing.

The outer surface electrode may be formed of an opaque material such as a Nesa (tin oxide) film or of a material having light reflectivity.

Further, the lighting device is not limited to the configuration of the embodiment.

In the cold cathode fluorescent lamp according to claim 2 of the present invention, the transparent resin sheet has a rectangular shape having an adhesive formed on the surface thereof, and the entire peripheral surface of the bulb end is provided at both ends in the longitudinal direction. And a pair of foil-shaped outer electrodes are attached to the sheet and wound around the outer surface of the valve.

The light-transmissive resin sheet has a shape in which both ends of a rectangular shape are extended to form protrusions, and the resin sheet is wound around a valve to widen the end of the valve. The same operation as described in claim 1 is achieved by winding the projecting piece so as to cover the entire peripheral surface of the valve with the resin sheet.

In the cold cathode fluorescent lamp according to claim 3 of the present invention, the translucent resin sheet is made of a silicone resin, a polyester resin or a polyethylene resin material, and the translucent heat-shrinkable tube is a fluorine resin. It is characterized by being made of resin.

By setting the materials of the light-transmitting resin sheet and the light-transmitting heat-shrinkable tube to the above, the light transmittance and the light emitting characteristics are less deteriorated, and the bonding strength with the holder can be improved.

An illumination device according to a fourth aspect of the present invention is a case, the cold cathode fluorescent lamp according to any one of the first to third aspects provided in the case, and lighting of the lamp. And a circuit device.

Since the fluorescent lamp, which has the operation described in any one of claims 1 to 3 and which prevents a defect caused by dielectric breakdown without causing a short circuit between the outer electrodes by an adhesive, is used as a light source, a short circuit occurs. As a result, it is possible to obtain an illuminating device that does not cause a defect.

[0037]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 is a front view showing a straight tube type cold cathode fluorescent lamp L1, and FIG. 2 (a) is a cross-sectional view of a portion of the central portion of the lamp L1 of FIG. FIG. 3B is a lateral cross-sectional view of a portion similarly cut along the line bb of the end, and FIG. 3 is a development view of the external electrode and the translucent resin sheet attached to the lamp L1 of FIG. .

In the figure, reference numeral 1 is made of soda lime glass, lead glass or the like and has an outer diameter of about 8.0 mm and an inner diameter of about 7.0 mm.
This is a straight tube-shaped transparent glass tube bulb having a length of about 366 mm, and both ends are hermetically closed. Reference numeral 2 denotes a phosphor coating formed on the inner surface of the bulb 1, and the phosphor coating 2 has an aperture 2A which is not coated with the phosphor and extends along the tube axis direction of the bulb. Also, valve 1
Xenon (Xe) is about 70 Tor as a discharge medium.
r is included.

3A and 3B are a pair of aluminum Al formed on the outer surface of the bulb 1 in parallel along the tube axis direction.
It is an outer electrode that forms a strip-shaped cold cathode made of tape or the like, and the side edge of the aperture (opening) 2A of the phosphor coating 2 and the side edge of the tape are provided so as to be optically and electrically separated from each other. There is.

Reference numeral 4 is a translucent resin sheet made of a silicon resin or the like, and the outer surface electrodes 3A, 3 excluding the surfaces of the outer surface electrodes 3A, 3B and the aperture (opening) 2A.
The outer surface of the bulb 1 between B and the outer peripheral electrodes 3A, 3B are wrapped and adhered so as to cover the entire peripheral surface of the end portion of the bulb 1 where the vicinity of the end portions of the outer electrode 3A, 3B are located, and ensure the insulation protection of the outer electrode 3A, 3B. Therefore, it is possible to prevent creeping discharge and electric shock accidents.

The surfaces of the translucent resin sheet 4 and the aperture (opening) 2A except for the vicinity of the end of the bulb 1 which is the crowned portion of the holder, which will be described later, are made of fluorine-based resin or the like having electrical insulation properties. The translucent heat-shrinkable tube 5 is covered, and the translucent resin sheet 4 including the external electrodes 3A and 3B is firmly adhered to the outer surface of the bulb 1, and the lamp L1 is protected from electrical safety and external impact. It is designed to prevent damage.

In the figure, 6 and 6 are the outer surface electrodes 3A,
3B is a conductive member connected to the end portion, 7 and 7 are cylindrical holders made of metal or synthetic resin which are joined to both ends of the valve 1 via an adhesive and also serve as a base, inside the holder 7 on the left side. The terminal portion (not shown) in the holder 7 is connected to the conductive members 6 and 6.

The outer electrodes 3A, 3B, the transparent resin sheet 4, and the heat shrinkable tube 5 are formed on the glass tube bulb 1 as follows.

First, the width as shown in FIG.
A translucent resin sheet 4 having a rectangular shape having a length of 1 mm and a length of about 360 mm and having protrusions 4a having a width of about 4 mm and a length of about 40 mm at both ends is prepared.

Next, the side edges of the pair of strip-shaped outer surface electrodes 3A and 3B are attached in parallel to the surface portion of the translucent resin sheet 4 on which the adhesive has been formed close to the side edges in the longitudinal direction.

The translucent resin sheet 4 is wound around the outer surface of the bulb 1 in a state where the resin sheet 4 is unfolded, on the side of one aperture (opening) 2A formed in the longitudinal direction of the glass tube bulb 1. The edges and the side edges of the outer surface electrode 3A are positioned so as to be substantially parallel to each other, and the resin sheet 4 is attached by winding the resin sheet 4 on the outer peripheral surface of the valve 1 except the aperture (opening) 2A. At this time, the other aperture (opening)
The side edge of 2A and the side edge of the outer surface electrode 3B are in substantially parallel corresponding positions.

Further, the resin sheet 4 is provided on both ends of the valve 1.
Since both ends are projected to increase the width and length, the resin sheets 4 and 4a are wound and adhered over the entire outer circumference of the valve 1 to cover the aperture (opening) 2A.

Further, a translucent heat-shrinkable tube made of a fluororesin having a diameter slightly larger than the outer diameter of the bulb 1 is wound around a portion of the bulb 1 excluding the vicinity of the end thereof, and the tube is heated. The light-transmissive resin sheet 4 and the aperture (opening) 2 that contract and include the outer electrodes 3A and 3B.
The heat-shrinkable tube 5 adheres the entire circumference surface of A. The heat-shrinkable tube 5 and the translucent resin sheet 4
Is preferably polymerized over 1 mm or more.

After this, a holder 7 is provided on one end of the valve 1 with a jet melt adhesive (Shin-Etsu Chemical Co., Ltd .: product number-
KE-3490) and a silicon-based adhesive (Sumitomo 3M Co., Ltd .: product model number-JA-7375), and the fluorescent members L1 are formed by connecting the conductive members 6 and 6 to the terminals. The cross section of the intermediate portion of the valve 1 has the same structure as the conventional one as shown in FIG. 2 (a), and the cross section of the end portion has the entire outer peripheral surface of the valve 1 as shown in FIG. 2 (b). The resin sheets 4 and 4a are wound and adhered.

The above-mentioned two kinds of adhesives are used for joining, because the silicon-based adhesive with which the bottom portion of the inside of the holder 7 is filled has high adhesive strength, heat resistance and insulation, but is solidified and stable. Since it takes a long time and the workability is low, the holder 7 is temporarily fixed with a solvent-free jet-melt adhesive applied to the opening side in the holder 7, and the main fixing is performed with a silicon-based adhesive for strong bonding. To be done. (When the temperature of the valve 1 is raised to about 90 to 110 ° C., the above-mentioned jet melt adhesive has a low insulation property, and there is a risk of causing dielectric breakdown between X and Y in FIG. 7B.) In the fluorescent lamp L1 having the external electrodes of the present invention having various configurations, even if a polyamide-based jet melt adhesive is used for temporarily joining the holder 7, the adhesive penetrates into the external electrodes 3A and 3B and both external electrodes There is no short circuit between 3A and 3B, and there is no defect in the lamp L1 due to dielectric breakdown of this portion.

Also, this aperture type fluorescent lamp L1
Is a lamp that emits a rare gas, has a small influence of ambient temperature on the light emission characteristics, has good directivity, and has good light distribution distribution characteristics. Further, the resin sheet 4 covering the aperture (opening) 2A portion has only a very small area at the end portion, and due to the presence of the resin sheet 4 in this portion, the resin sheet 4 discolors due to the deterioration of ultraviolet rays and the light transmittance is lowered. Therefore, the amount of light emitted from the aperture (opening) 2A does not decrease.

Further, since the adhesive bonding area between the heat-shrinkable tube 5 and the holder 7 is increased, the holder 7 can be firmly bonded to the end portion of the valve 1.

Therefore, it is possible to provide the fluorescent lamp L1 in which the luminous efficiency is improved and the life is extended and the holder 7 is firmly joined.

The cold cathode fluorescent lamp L1 having the above structure
Is lit by, for example, supplying electric power from a pulse lighting circuit device (not shown) to the outer electrodes 3A and 3B through power supply lines (not shown) and conductive members 6 and 6. When pulse wave power having a duty ratio of 10% at a peak voltage of 1.6 kV and 60 kHz is applied to the outer surface electrodes 3A and 3B from this pulse lighting circuit device, a discharge is generated between the outer surface electrodes 3A and 3B separated in the bulb 1. Occur.
Due to this discharge, the rare gas is ionized and excited to generate ultraviolet rays, which are converted into visible light by the phosphor coating 2, and the visible light is the aperture (opening) 3 portion where the phosphor coating 2 is not formed. It is radiated to the outside through the bulb 1 of.

Although the holder 7 made of metal is used in the above-mentioned embodiment, the holder 7 may be made of an insulating synthetic resin such as polycarbonate, and a pair of conductive members may be provided in the holder 7 on one side. Members 6 and 6 and feeders 61 and 61
Even when and are connected, it is stable to hold only the holder 7 on the other side as shown in FIG. 4 (a) and hold the lamp L2 by the holders 7, 7 at both ends of the bulb 1. You may

According to the present invention, like the resin sheet 4 and the external electrodes 3A and 3B shown in FIG. 4B, the conductive members 6 and 6 are separately connected to the left and right of the valve 1 and connected to both ends of the valve 1. Power may be supplied through the joined holders 7, 7.

Further, holders 7 and 7 are provided on both ends of the valve 1 having the structure shown in FIG. 1 with the same structure as in the above-mentioned embodiment, and a jet melt adhesive (Sumitomo 3M Co., Ltd .: product number-J
A-7375) and a silicon-based adhesive (Shin-Etsu Chemical Co., Ltd .: product model number-KE-3490) were used to examine the bonding strength of the holder 7 of the fluorescent lamp L2, and the results shown in Table 1 were obtained. .

[Table 1] In Table 1, the product 1 of the present invention has no heat-shrinkable tube 5 in the crowned portion of the holder 7 at the end of the valve 1 and has an adhesive on the entire circumferential surface around which the projecting piece 4a and the resin sheet 4 are wound. A holder 7 is joined via a heat-shrinkable tube in which the projecting piece 4a and the resin sheet 4 are wound on the entire circumferential surface on the crowned portion of the holder 7 at the end of the valve 1. 52 to about 1
The lamp L2 has a holder 7 joined to the lamp L by projecting it by mm and covering the tip of the projection. In addition, conventional products are shown in Figs.
In the structure shown in FIG. 2, the difference from the products 1 and 2 of the present invention is that the resin sheet 4 is not wrapped around the entire peripheral surface of the crowned portion of the holder 7 and some of the adhesive is attached to the glass surface of the bulb 1. Are joined together.

The bonding strength is such that the holder 7 is attached and fixed to the socket-shaped receiving port, the valve 1 side is rotated, and the adhesive layer is broken or the boundary between the adhesive layer and the valve 1 or the adhesive layer and the holder. Peel off the boundary with 7 and turn torque (kgf
* Cm) was examined.

As is clear from Table 1, it was confirmed that the two types of the fluorescent lamp L2 of the present invention have a breaking strength improved by about 32% as compared with the fluorescent lamp L of the conventional structure.

The bonding strength of the lamps L2 of the products 1 and 2 of the present invention was increased because the fluorine-based resin used for the heat-shrinkable tube had high chemical resistance and the adhesive strength was weak with any adhesive. . Therefore, by eliminating the portion where the holder and the fluorine-based resin overlap, the overlapping area of the translucent resin sheet becomes large and the joining becomes easy.

The cold cathode fluorescent lamp L1 having the above structure
And L2 are used by being incorporated in a lighting device as shown in FIGS. 5 (a) and 5 (b).

FIG. 5A shows a light guide type illumination device 9A.
9 is a partial cross-sectional perspective view showing the embodiment of FIG.
A fluorescent lamp L1 holding the holders 7, 7 portions at both ends is arranged in the housing 91. Reference numeral 92 is a light guide plate made of acrylic resin, 93 and 94 are reflection sheets formed on the bottom and side surfaces of the light guide plate 92 and inside a light guide plate housing case (not shown), and 95 is provided on the upper surface side of the light guide plate 92. These are light diffusing plates, which are incorporated together with the lighting circuit device inside the housing case or the like that forms a fixture body (not shown).

In this light guide type, the light emitted from the aperture (opening) 2A of the lamp L1 enters the light guide plate 92, passes through the light guide plate 92, and reaches the bottom surface or the side surface. The light is reflected by 93, 94 and goes to the upper surface of the light guide plate 92. Then, the light that has entered the light diffusing plate 95 from the upper surface of the light guide plate 92 is diffused from the upper surface of the light diffusing plate 95 and is emitted toward, for example, the liquid crystal panel P.

FIG. 5B is an exploded perspective view of a reflector type illumination device 9B. A plurality of fluorescent lamps L1, ... Are mounted in a casing 91 which also serves as a reflecting mirror, and the casing 91 is provided.
The light diffusing plate 95 is placed in the opening of the device, and these are configured to be incorporated together with the lighting circuit device in the inside of the fixture body (not shown). In this case, the direct light from the aperture (opening) 2A of the lamp L1 is incident on the light diffusing plate 95, diffused and emitted from the upper surface of the light diffusing plate 95.

These illuminating devices 9A and 9B can be used as a backlight for a liquid crystal display device such as a personal computer or a television or a display plate on which a predetermined display device is formed, or as a general illuminating device.

Then, these illumination devices 9A and 9B
Is concentrated from the aperture (opening) 2A of the fluorescent lamp L1 without causing a decrease in luminous efficiency of the lamp L1,
In addition, it is possible to cause uniform light emission along the bulb 1 axis.

Further, the illumination devices 9A and 9B of the present invention are not limited to those described in the embodiment, and the housing 91 is the lamp L1.
If the phosphor coating 2 has low light reflectivity, it may also serve as a reflector. Also,
The light diffusion plate 95 is not essential, and the lighting device may be provided integrally with the lighting devices 9A and 9B or may be separately provided.

Further, the illumination devices 9A and 9B are used for stationary or on-vehicle liquid crystal display devices, backlights for liquid crystal televisions, decoration devices, etc., as well as for reading devices such as facsimiles, and for OA equipment such as exposure for copying machines. Alternatively, it goes without saying that it can be widely used by being attached to ordinary lighting equipment or lighting equipment.

[0069]

According to the structure described in claim 1 of the present invention, it is possible to provide a fluorescent lamp in which the luminous efficiency is improved and the life is extended and the holder is firmly joined.

According to the configuration of claim 2 of the present invention,
By forming the translucent resin sheet by forming the main body part and the separate projecting piece part by the same member, it is easy to perform dimensioning and sticking work, and to obtain the same effect as described in claim 1. According to the configuration of claim 3 of the invention, by selecting the materials of the translucent resin sheet and the translucent heat-shrinkable tube, the light transmittance and the light emission characteristics are less deteriorated, and the holder adhesive is bonded. The strength can be improved.

According to the configuration of claim 4 of the present invention,
It is possible to provide a lighting device that includes the fluorescent lamp that achieves the effects described in claims 1 to 3, and that can improve the luminous efficiency and extend the life of the fluorescent lamp.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a straight tube type cold cathode fluorescent lamp according to the present invention.

FIG. 2 (a) is an arrow view a of a central portion of the lamp shown in FIG.
A cross-sectional view of a portion cut along line -a, and (b) is a cross-sectional view of a portion cut along line bb of the same end.

FIG. 3 is a development view of an outer surface electrode and a translucent resin sheet attached to the lamp shown in FIG.

4A and 4B show another embodiment of the cold cathode fluorescent lamp according to the present invention, wherein FIG. 4A is a front view of the fluorescent lamp, and FIG. 4B is a development view of an outer electrode and a transparent resin sheet. .

5A and 5B show an embodiment of an illumination device (backlight) according to the present invention, FIG. 5A is a perspective view of a light guide type backlight, and FIG. 5B is a reflection type backlight of the same. It is an exploded perspective view.

FIG. 6 is a front view showing a conventional straight tube type cold cathode fluorescent lamp.

7 (a) is a view c of the central portion of the lamp shown in FIG.
A cross-sectional view of a portion cut along the line -c, and (b) of the figure are cross-sectional views of a portion cut along the line dd of the end of the same.

8 is a development view of an external electrode and a translucent resin sheet attached to the lamp shown in FIG.

[Explanation of symbols]

L1, L2: Cold cathode fluorescent lamp 1: Glass tube bulb 2: Phosphor coating 2A: Aperture (opening) 3A, 3B: External electrodes 4: Translucent resin sheet 4A: Protrusion 5: Heat shrinkable tube 9A, 9B: Lighting device 91: Case

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Ryuji Tsuchiya             1 Hari, 5-2 Asahi-cho, Imabari-shi, Ehime Prefecture             Son Toshiba Lighting Co., Ltd. (72) Inventor Naoki Tsutsui             1 Hari, 5-2 Asahi-cho, Imabari-shi, Ehime Prefecture             Son Toshiba Lighting Co., Ltd.

Claims (4)

[Claims] 1. A bulb excluding a glass tube bulb, a phosphor coating formed on the inner surface of the bulb along the tube axis leaving an aperture, a discharge medium enclosed in the bulb, and a portion corresponding to the aperture. A pair of strip-shaped outer electrodes arranged on the outer surface along the tube axis direction so as to be spaced apart from each other, a valve outer surface excluding a portion corresponding to the aperture, a surface of the outer electrode, and a valve near the end portion of the outer electrode. A translucent resin sheet formed so as to cover the entire peripheral surface of the end, and a translucent heat-shrinkable tube formed so as to cover the valve outer surface portion corresponding to the aperture except the vicinity of the valve end portion and the resin sheet portion. And a holder joined to the light-transmissive resin sheet at the end of the bulb via an adhesive agent. 2. The translucent resin sheet has a rectangular shape having an adhesive formed on the surface thereof, and has protrusions extending at both ends in the longitudinal direction so as to cover the entire peripheral surface of the valve end portion. The cold cathode fluorescent lamp according to claim 1, wherein a pair of thin plate-shaped outer surface electrodes are attached to the upper surface of the bulb and the outer surface of the bulb is wound and attached to the outer surface of the bulb. 3. The translucent resin sheet is made of a silicone resin, a polyester resin, or a polyethylene resin material, and the translucent heat-shrinkable tube is made of a fluororesin. The cold cathode fluorescent lamp described. 4. A housing, a cold cathode fluorescent lamp according to any one of claims 1 to 3 provided in the housing, and a lighting circuit device for the lamp. Characteristic lighting device.