JP2002184360A - Fluorescent lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deterioration and yellowing of the aperture due to the passing visible light generated in the glass bulb and improve transmittancy of the visible light by constructing the aperture 2 by glass only. SOLUTION: A fluorescent coating 3 is formed on the inner face of the glass bulb 1 having an aperture 2. A sheet structure 4 is wound on the outer circumference of the glass bulb 1 excluding the portion of the aperture 2 and is adhered by a bonding layer 12. The sheet structure 4 comprises a pair of belt-shape outer electrodes 6, 7 that are arranged mutually in parallel at a distance at the rear face of the translucent sheet 5 having insulation capability, and folds back at the outer edge of the outer electrodes 6, 7. A translucent sheet 5 covers and adheres the outer electrodes 6, 7 and a bonding layer 12 is formed on the outer face of the folding-back piece 5a of the translucent sheet 5. This bonding layer 12 is wound and adhered on the outer circumference of the glass bulb 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aperture having an external electrode used for a document reading light source used for OA equipment such as an image scanner, a copying machine, a facsimile, and a backlight of a liquid crystal display panel. Shape fluorescent lamp.

[0002]

2. Description of the Related Art Conventionally, an example of a fluorescent lamp of this type having an insulating and translucent sheet on the outer surface of a bulb will be described with reference to FIGS. In FIG. 7, a fluorescent film 103 having an aperture 102 for projecting light along the axis of the bulb is formed on the inner surface of a glass bulb 101 in which a rare gas mainly containing xenon gas is sealed. A pair of strip-shaped external electrodes 106 and 107 provided with terminals 104 and 105 are disposed in parallel at the positions corresponding to the portions where the phosphor coating 103 is formed on the outer surface thereof, and are disposed in parallel along the bulb axis. Belt-shaped external electrode 10
6, 107 and the surface of the glass bulb 101 are provided with a light-transmitting sheet 108 having an insulating property.
Between the external electrodes 106 and 107
The light-transmitting sheet 108 is positioned so that
01 to prevent a short circuit accident between the external electrodes 106 and 107. This fluorescent lamp is a glass bulb 101
The sheet structure 109 is wound in close contact with the outer peripheral surface of, and is manufactured by bonding. As shown in FIG. 8, the sheet structure 109 is provided with an adhesive layer 110 having an adhesive or an adhesive function on the back surface of a translucent sheet 108 having a length substantially equal to the entire length of the glass bulb 101. A pair of flat band-shaped external electrodes 106 and 107 made of a metal member having light-transmitting and conductive properties are arranged on the back surface of the light-transmitting sheet 108 at a predetermined distance from each other;
Further, an adhesive layer 111 is formed on the back surfaces of the strip-shaped external electrodes 106 and 107. Then, the sheet structure 109
In the expanded state, the glass bulb 101 is positioned on the side edge of the sheet structure 109 in the longitudinal direction in parallel with the external electrodes 106 and 107, and the glass bulb 101 is slightly pressed against the translucent sheet 108. , The sheet structure 109 is wound around the outer peripheral surface of the glass bulb 101, and the sheet structure 1 is bonded by the adhesive layers 110 and 111.
09 is adhered to the glass bulb 101.

[0003]

However, the aperture-type fluorescent lamp having the external electrodes of the above-mentioned conventional example has the following problems.
A light-transmitting sheet is also adhesively coated with an adhesive layer on the outer peripheral surface of the glass bulb at the aperture part, which is the light projection window, and visible light passes through the glass bulb, the adhesive layer, and the light-transmitting sheet during lighting. Radiation to the outside. With the visible light emitted from the aperture, the adhesive and the translucent sheet gradually cure and discolor with the lighting time, the transmittance of the visible light from the aperture decreases with time, and the lamp illuminance decreases. There was a problem.

In view of the above, according to the present invention, a portion corresponding to the aperture in the outer peripheral surface of the glass bulb is formed only of glass without providing an adhesive layer or a translucent sheet at all, and the aperture is deteriorated by light radiated from the aperture to the outside. Improve illuminance reduction by preventing yellowing, wrap the external electrode with a translucent sheet having insulating properties and attach it to the outer peripheral surface of the glass bulb by attaching it to ensure the insulation of the external electrode, thus ensuring a fluorescent lamp. The purpose is to extend the life of the battery.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a phosphor film having a discharge medium sealed therein and having an aperture extending along a bulb axis. A pair of external electrodes are spaced apart and parallel to each other on a straight tubular glass bulb formed on a transparent glass sheet having an insulating property whose longitudinal direction is substantially the same as the entire length of the glass bulb. And a sheet structure in which the translucent sheet covers the external electrodes.
The seat structure is provided on a portion of the outer peripheral surface of the glass bulb except for the aperture. As in the invention according to claim 2, the sheet structure has an adhesive layer having an adhesive or adhesive function formed on the back surface of the translucent sheet having an insulating property, and further comprises a pair of external electrodes separated from each other and parallel to each other. And, it is disposed and adhered along the longitudinal direction of the translucent sheet, and the outer edge in the longitudinal direction of the external electrode in the translucent sheet is a fold. The folded back piece of the light-transmitting sheet is folded back to the back side of the light-transmitting sheet, and the folded-back piece of the light-transmitting sheet is polymerized and adhered to the back surface of the light-transmitting sheet between the external electrodes and the external electrodes, thereby bonding the external electrodes. Wrapped with a light-transmitting sheet, an adhesive layer is formed on the outer surface of the folded piece of the light-transmitting sheet, and the sheet structure is wound around a portion of the outer peripheral surface of the glass bulb except for the aperture, The translucency Characterized in that the adhesive in the adhesive layer formed on the outer surface of the over bets folded piece.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 is a longitudinal sectional view showing a fluorescent lamp, FIG. 2 is a developed rear view of the sheet structure, FIG. 3 is an enlarged sectional view taken along line AA of FIG. 2, FIG.
FIG. 5 is an explanatory diagram showing a method for manufacturing a fluorescent lamp. First, in FIG. 1, reference numeral 1 denotes a transparent glass bulb having a straight tubular shape, both ends of which are hermetically closed, and a rare gas containing xenon (Xe) gas as a main component as a discharge medium is sealed in a predetermined manner. Sealed with pressure. On the inner surface of the glass bulb 1, a phosphor coating 3 having an aperture 2 as a light projection window is formed along the bulb axis.

A sheet structure 4 is wound and adhered to a portion of the outer peripheral surface of the glass bulb 1 except for the aperture 2.
The sheet structure 4 includes a light-transmitting sheet 5 having a length substantially equal to the entire length of the glass bulb 1, and a pair of band-shaped external electrodes 6 and 7 having a shorter length than the light-transmitting sheet 5. And terminals 8, 9 attached to the ends of these external electrodes 6, 7.
And adhesive layers 10 and 11 having an adhesive or adhesive function
The light-transmitting sheet 5 and the folded-back piece 5a of the light-transmitting sheet are separated from each other and adhered in parallel to each other.
The pair of band-shaped external electrodes 6 and 7 are covered, and the back surface of the light-transmitting sheet 5 is formed between the external electrodes 6 and 7 by polymerizing and bonding to each other. The light-transmitting sheet 5 needs to be made of a material having an insulating property and a light-transmitting property. For example, a polyethylene terephthalate (PET) resin is preferable, but a polyester resin may be used. The external electrodes 6 and 7 may be made of a metal member that is excellent in conductivity and is opaque. For example, an aluminum tape, a copper tape that is subjected to a reflective plating treatment, or a silver tape is used. The terminals 8 and 9 are made of a metal member having excellent conductivity, such as copper, and are attached to the surface-side ends of the external electrodes 6 and 7 by soldering or the like. Further, a power supply harness (not shown) is soldered or the like. It is attached by means. As the adhesive layers 10, 11, and 12, a silicone-based adhesive is suitable, but an acrylic-based adhesive or the like may be used.

An example of a method for manufacturing the sheet structure 4 will be described with reference to FIGS. First, as shown in FIGS. 2 and 3, an adhesive layer 10 is formed on the back surface of the translucent sheet 5 in a state where the translucent sheet 5 having an insulating property is developed. On the back surface of the light-transmitting sheet 5, external electrodes 6, 7 having terminals 8, 9 are spaced apart from each other, arranged in parallel and along the longitudinal direction of the light-transmitting sheet 5, and the front surfaces of the external electrodes 6, 7 are arranged. Adhesive layer 1
0. The distance between the external electrodes 6 and 7 is determined by the outer diameter of the glass bulb 1, the opening angle of the aperture 2, and the width of the external electrodes 6 and 7. That is, the distance 1 between the outer edges of the external electrodes 6 and 7 is set to be substantially the same as the length of a superior arc determined by the opening angle θ of the aperture 2 on the outer periphery of the glass bulb 1. External electrodes 6, 7
An adhesive layer 11 is formed on the back surface of the light-transmitting sheet 5, and an adhesive layer 12 is formed on a portion of the surface of the translucent sheet 5 outside the outer edges of the external electrodes 6 and 7. Next, a portion of the translucent sheet 5 outside the outer edges of the external electrodes 6 and 7 is folded back to the back side of the translucent sheet 5 and the external electrodes 6 and 7 using the outer edges of the external electrodes 6 and 7 as folds. The folded piece 5a of the translucent sheet is connected to the back surfaces of the external electrodes 6, 7 and the external electrodes 6,
4 and 5 by superimposing with the back surface of the translucent sheet 5 located between 7, and further bonding with the adhesive layers 10 and 11, sandwiching the external electrodes 6 and 7 with the translucent sheet 5 and covering them. The seat structure 4 is manufactured.

The fluorescent lamp of the present invention is manufactured, for example, as follows. The above-mentioned sheet structure 4 is placed at a predetermined position with the folded piece 5a of the translucent sheet facing upward, as shown in FIG.
For example, it is mounted on an assembly stage. Next, the bulb axis of the glass bulb 1 is parallel to the longitudinal direction of the sheet structure 4 and the external electrodes 6 and 7, and one side edge of the sheet structure 4 (the fold of the translucent sheet 5) coincides with the opening edge of the aperture 2. Position to be. In this state, the glass bulb 1 is rolled in the direction indicated by the arrow in FIG. 5 by slightly pressing the glass bulb 1 against the sheet structure 4, and the sheet structure 4 is wound around the outer peripheral surface of the glass bulb 1 excluding the aperture 2, and the adhesive layer is formed. 12 is adhered.

The relationship between the lamp operating time and the illuminance of the fluorescent lamp of this embodiment was tested, and the results are shown by the solid line in FIG. For comparison, the same test was performed on the fluorescent lamps shown in FIGS. 7 to 9 using a PET resin sheet for the light-transmitting sheet 108 and using a silicone-based adhesive for the adhesive layers 110 and 111. The result is shown by a dotted line in FIG.
As a result of the test, the illuminance was improved by 5% as compared with the conventional fluorescent lamp 1000 hours after the start of lighting.

Since the aperture 2 is not covered with the PET resin sheet and the adhesive, and is made of only glass, curing of the PET resin sheet, yellowing and coloring of the adhesive are completely eliminated, and visible light is not emitted. Transmittance improved. Further, since the external electrodes 6 and 7 are covered with one translucent sheet 5 which is folded and adhered, insulation from the outside is secured. In addition, the external electrodes 6 and 7 are connected to the glass bulb 1 only by rolling the glass bulb 1 on the seat structure 4.
Can be adhered to the outer peripheral surface except for the aperture 2, and since the external electrodes 6, 7 are arranged in the sheet structure 4 at a predetermined interval in advance, the work of adjusting the positions of the external electrodes 6, 7 is unnecessary, and the work efficiency is remarkably improved. can do.

[0012]

According to the present invention, since the aperture is made of only glass, the material constituting the aperture is not deteriorated by visible light, and the transmittance of visible light is lower than that of a conventional fluorescent lamp of this type. This has the effect of improving.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of a fluorescent lamp.

FIG. 2 is a developed rear view of the seat structure.

FIG. 3 is an enlarged sectional view taken along line AA of FIG. 2;

FIG. 4 is a front view of a sheet structure.

FIG. 5 is an explanatory view showing a method of manufacturing a fluorescent lamp by rolling a glass bulb on the back surface of a seat structure.

FIG. 6 is a diagram showing a relationship between a lighting time of a fluorescent lamp and a relative illuminance.

FIG. 7 is a longitudinal sectional view of a conventional example.

FIG. 8 is a developed rear view of a conventional seat structure.

FIG. 9 is an enlarged sectional view taken along line BB of FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Glass bulb 2 Aperture 3 Phosphor coating film 4 Sheet structure 5 Translucent sheet 5a Folded piece of translucent sheet 6, 7 External electrode 10, 11, 12 Adhesive layer

Claims (2)

[Claims] 1. A straight tube-shaped glass bulb in which a discharge medium is sealed and a phosphor film having an aperture along an axis of the bulb is formed on an inner surface, and a length substantially equal to the entire length of the glass bulb is set to be long. A light-transmitting sheet having an insulating property in a direction, a pair of external electrodes being spaced apart from each other and arranged in parallel with each other, and a sheet structure in which the light-transmitting sheet covers the external electrodes. A fluorescent lamp, wherein the seat structure is provided in a portion of the outer peripheral surface of the glass bulb other than the aperture. 2. The sheet structure according to claim 1, wherein an adhesive layer having an adhesive or adhesive function is formed on a back surface of the light-transmitting sheet having an insulating property, and a pair of external electrodes are spaced apart from each other in parallel to form the light-transmitting sheet. Place and bond along the longitudinal direction of the sheet,
The outer edge of the external electrode in the translucent sheet in the longitudinal direction is a fold, and a portion of the translucent sheet outside the fold is folded back to the back side of the translucent sheet. The folded piece of the transparent sheet is polymerized and adhered to the external electrode and the back surface of the translucent sheet between these external electrodes to cover the external electrode with the translucent sheet, and to fold the translucent sheet. An adhesive layer is formed on the outer surface of the piece, and this sheet structure is wound around a portion of the outer peripheral surface of the glass bulb except for the aperture, and is formed with an adhesive layer formed on the outer surface of the folded piece of the translucent sheet. The fluorescent lamp according to claim 1, wherein the fluorescent lamp is bonded.