JP2000331648A - Adhesive insulating sheet for electrode sheet and electrode sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesive insulating sheet for an electrode sheet and an electrode sheet preventing heat resistant PEN(polyethylene naphthalate) sheet from discoloring by absorbing an ultraviolet ray around a wave length of 350 nm included in light emitted from a rare gas discharge lamp under operation. SOLUTION: An adhesive insulating sheet for an electrode sheet 4 is constituted by forming a silicone adhesive layer 2 containing an ultraviolet ray absorbing agent on a transparent PEN sheet 1, and affixing a film like separator 3 on the layer. An electrode sheet having individual pairs of electrode layers with a adhesive layer on the silicone adhesive layer 2 containing the ultraviolet ray absorbing agent on the transparent PEN sheet 1, and having the film like separator 3 covering the individual pairs of electrode layers is manufactured using the adhesive insulating sheet. This electrode sheet is used for adding an external electrode for a rare gas discharge lamp applicable to a usage exposed to a high temperature such as an automobile.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an adhesive insulating sheet for an electrode sheet and an electrode sheet, and more particularly to an adhesive insulating sheet for an electrode sheet and an electrode sheet used for mounting an external electrode of a rare gas discharge lamp.

[0002]

2. Description of the Related Art In recent years, a phosphor layer has been applied to the inner wall of a tubular glass bulb, and a rare gas containing xenon gas as a main component has been sealed therein. A rare gas discharge lamp provided with a pair of opposed strip-shaped external electrodes over substantially the entire length is a facsimile, O
It has been used as a light source for reading originals of OA equipment such as a CR and a copier, and as a backlight of a liquid crystal display device (JP-A-3-225745). This rare gas discharge lamp applies high frequency voltage between both external electrodes,
In the discharge space inside the bulb, a discharge is generated by xenon gas in a direction perpendicular to the bulb axis, and the phosphor film deposited on the bulb inner wall is excited to emit light. The discharge gas does not contain metal vapor such as mercury, the phosphor film is efficiently excited by the excitation light (147 nm) of xenon gas, and a high luminous intensity is obtained.
A stable discharge is obtained with uniform illuminance distribution in the axial direction, and since the phosphor film is not affected by metal ions, the deterioration of the film is reduced and the light output is prevented from lowering.

[0003] An electrode sheet is used to attach the pair of strip-shaped external electrodes. One example of a conventional electrode sheet includes, in this order, a pair of strip-shaped electrode layers having an adhesive layer to be attached to a glass bulb, a silicone-based adhesive insulating layer, and a transparent resin film. A film separator is provided on the exposed portion of the adhesive insulating layer. This electrode sheet is attached to the glass bulb via the exposed portions of the adhesive layer and the silicone-based adhesive insulating layer, and a brazing agent or conductive adhesive is attached to one end portion of the pair of strip-shaped electrode layers exposed from the transparent resin film. A terminal component is attached using an agent, and a wire of a cord is connected to the terminal component to manufacture a rare gas discharge lamp. When the electrode sheet as described above is used, the productivity of the rare gas discharge lamp is inferior. Therefore, an electrode sheet having a terminal portion provided on the electrode layer itself has been put to practical use (Japanese Patent Laid-Open No. 9-129188).
No.).

As the transparent resin film of the electrode sheet, a PET (polyethylene terephthalate) film is usually used.
Deterioration is likely to occur at high temperatures of ℃ or higher, and therefore, there is a problem in using rare gas discharge lamps manufactured using electrode sheets made of PET films in applications such as automobiles that are exposed to high temperatures. Was.

[0005]

Therefore, attempts have been made to use a heat-resistant PEN (polyethylene naphthalate) film instead of a PET film. However, the PEN film has a drawback that it absorbs ultraviolet light having a wavelength of about 350 nm included in light emitted when the rare gas discharge lamp is turned on and changes its color. An object of the present invention is to provide an adhesive insulating sheet for an electrode sheet and an electrode sheet which have solved the above-mentioned drawbacks of a PEN film.

[0006]

According to the present invention, there is provided a transparent polyethylene naphthalate (PEN) film having a silicone-based pressure-sensitive adhesive layer containing an ultraviolet absorbent, and a film-like separator thereon. An adhesive insulating sheet for an electrode sheet, and a transparent polyethylene naphthalate (PEN) film having a silicone-based pressure-sensitive adhesive layer containing an ultraviolet absorber, and a pair of electrode layers each having a pressure-sensitive adhesive layer thereon. And an electrode sheet having a film-like separator so as to cover the pair of electrode layers.

Hereinafter, the present invention will be described in detail. In the present invention, a PEN film is used as the transparent resin film.
The EN film is a film obtained by melt-extruding a crystalline resin PEN obtained by polycondensing naphthalene-2,6-dicarboxylic acid or an ester thereof and ethylene glycol, and biaxially stretching the film. In the present invention, the silicone pressure-sensitive adhesive layer contains an ultraviolet absorber, which absorbs ultraviolet light having a wavelength around 350 nm contained in light emitted when the rare gas discharge lamp is turned on, thereby preventing discoloration of the PEN film. I do. The silicone-based pressure-sensitive adhesive layer is usually cross-linked, and also serves as an insulating layer. The pressure-sensitive adhesive layer on the electrode layer is usually an acrylic pressure-sensitive adhesive layer, which is usually crosslinked. Since the film-like separator comes into contact with the silicone pressure-sensitive adhesive layer, a fluorine-containing silicone-treated film-like separator is usually used.

Examples of the ultraviolet absorber contained in the silicone-based pressure-sensitive adhesive layer include benzotriazole-based, triazine-based, oxalic anilide-based and benzophenone-based ultraviolet absorbers, and may be used alone or in combination. It can be selected, but may be selected in consideration of compatibility and the like according to the type of the silicone pressure-sensitive adhesive to be used.

The electrode layer is formed of, for example, aluminum foil, but is not limited to this as long as it is conductive, and may be formed of metal foil such as copper or silver. Each pair of electrode layers having an adhesive layer, in the process of manufacturing the electrode sheet, for example, leaving each pair of electrode layers having an adhesive layer by half-punching an aluminum foil adhesive sheet so as not to punch the separator, The excess aluminum foil is scraped and formed. The shape of the electrode layer is a shape such as a substantially square or a substantially rectangular shape corresponding to the shape of the discharge lamp, and as described above, is usually a strip-like substantially rectangular shape.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings, but it goes without saying that the present invention is not limited to these embodiments. In addition, each drawing is a conceptual diagram for facilitating understanding of the present invention, and the dimensions and ratios of each member in each drawing do not represent actual ones. It should be noted that these are given as examples and are not intended to be limiting.

FIG. 1 is a sectional view of an example of the pressure-sensitive adhesive insulating sheet for an electrode sheet of the present invention. On a PEN film 1 having a thickness of about 75 μm, an insulating silicone-based pressure-sensitive adhesive layer 2 containing a UV absorber having a dry thickness of about 30 μm is applied and formed, and a fluorine-containing silicone-treated PET separator 3 is laminated thereon, and an electrode sheet is formed. The adhesive insulating sheet 4 is formed. It is preferable that the insulating silicone pressure-sensitive adhesive layer 2 is cross-linked because it is heated when the rare gas discharge lamp is used.

An electrode sheet is manufactured using such an adhesive insulating sheet for an electrode sheet 4 of the present invention. For example, an aluminum foil having a thickness of about 50 μm and a dry thickness of about 35
A part of the aluminum foil pressure-sensitive adhesive sheet comprising an acrylic pressure-sensitive adhesive layer having a thickness of μm and a fluorine-containing silicone-treated separator is partially cut out from above the aluminum foil so as not to punch out only the separator in accordance with the shape of each pair of electrodes. The aluminum foil is scraped off to form a sheet in which the aluminum foil is punched into the shape of the electrode layer. The acrylic pressure-sensitive adhesive layer of the aluminum foil pressure-sensitive adhesive sheet is usually cross-linked, and the separator can also function as a sheet for transport in each step in the case of continuous production. The electrode layer may have, for example, a shape having a convex tongue-shaped terminal portion having no pressure-sensitive adhesive layer (JP-A-9-129).
188 publication). The fluorine-containing silicone-treated PET separator 3 is peeled off from the adhesive insulating sheet 4, and an insulating silicone-based material containing an ultraviolet absorber is formed on a sheet obtained by punching aluminum foil in the shape of an electrode layer so that the adhesive insulating sheet 4 covers the electrode layer. The adhesive insulating sheet 4 is attached via the adhesive layer 2. Next, the part of the adhesive insulating sheet 4 of the obtained sheet is half-cut so as not to punch out only a separator (a separator of an aluminum foil adhesive sheet) in a range larger than the part of each pair of electrode layers. An electrode sheet is obtained by scraping portions other than those covering the pair of electrode layers of No. 4 (Japanese Patent Application No. 11-136577). FIG. 2 shows an example of the electrode sheet created in this way, but in this figure, the drawing of the thickness is omitted. In FIG. 2, reference numeral 4 'denotes an adhesive insulating sheet 4 punched in half-punching, reference numerals 5 and 5' denote a pair of electrode layers with terminal portions, and reference numeral 6 denotes a separator (a separator of an aluminum foil adhesive sheet).

The terminal portion is preferably reinforced in terms of strength. For this purpose, the aluminum foil pressure-sensitive adhesive sheet is made by peeling off the separator of the pressure-sensitive adhesive sheet comprising an aluminum foil, an acrylic pressure-sensitive adhesive layer and a separator. A reinforcing tape such as a tape is bonded to one end of an aluminum foil through the acrylic pressure-sensitive adhesive layer, and a separator is bonded to the separator again through the remaining pressure-sensitive adhesive layer. Preferably, there is. In this case, of course, at least a part of the reinforcing aluminum foil portion is configured as a terminal portion (Japanese Patent Application No. 11-13 / 1999).
No. 6477). The reinforcing terminal portion is used to secure the strength of the terminal portion when the terminal portion and the wire of the cord are wound by a caulking member or when the discharge lamp is used, but depending on the material and thickness of the metal foil, It is necessary to determine the necessity.

When the electrode sheet of FIG. 2 is used, when the adhesive insulating sheet 4 'is turned up, a pair of electrode layers 5 and 5' stick together with the sheet 4 'and come off from the separator. Is attached to the outer surface of the rare gas discharge lamp along the axial direction of the tubular glass bulb. In addition,
The light of the rare gas discharge lamp is transmitted from the glass bulb to both electrode layers 5 and 5 '.
Then, it comes out through the adhesive insulating sheet 4 'between the portions and is used for lighting. The wires of the pair of cords are wound together with the respective terminal portions by a conductive caulking member and caulked to connect the wires and the electrodes.

[0015]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but it goes without saying that the present invention is not limited to the examples.

Example 1 An oxalic anilide type ultraviolet absorber was dissolved in toluene to prepare an ultraviolet absorber solution having a solid content of 50% by weight. This solution and a toluene solution of a silicone-based pressure-sensitive adhesive having a solid content concentration of 40% by weight were mixed so that the weight ratio of the solid content (silicone-based pressure-sensitive adhesive: ultraviolet absorber) was 100: 1. The obtained mixed solution is applied on a PEN film 1 having a thickness of about 75 μm to form an insulating silicone-based pressure-sensitive adhesive layer 2 containing an ultraviolet absorber having a dry thickness of about 30 μm, and a fluorine-containing silicone-treated PET is formed thereon. The separator 3 was stuck to form an adhesive insulating sheet 4 as shown in FIG.

Using this adhesive insulating sheet 4, an electrode sheet as shown in FIG. 2 was prepared in the same manner as described in the "Embodiment of the invention" section. A rare gas discharge lamp was assembled using this electrode sheet, and the rare gas discharge lamp was turned on for 400 hours, but little discoloration of the PEN film was observed.

[0018]

According to the present invention, the silicone pressure-sensitive adhesive layer of the electrode sheet contains an ultraviolet absorber, which has a wavelength of 350 nm contained in the light emitted when the rare gas discharge lamp is turned on.
By absorbing near ultraviolet rays and preventing discoloration of the PEN film, it is possible to provide a rare gas discharge lamp that can be used in applications such as automobiles that are exposed to high temperatures by utilizing the heat resistance of the PEN film.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an example of an adhesive insulating sheet for an electrode sheet of the present invention.

FIG. 2 is a conceptual perspective view of an example of the electrode sheet of the present invention.

[Explanation of symbols]

 Reference Signs List 1 PEN film 2 Insulating silicone pressure-sensitive adhesive layer 3 Fluorine-containing silicone-treated separator 4, 4 'Adhesive insulating sheet 5, 5'

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C09J 7/02 C09J 7/02 Z H01J 61/35 H01J 61/35 F (72) Inventor Yukio Takamizawa Tokyo 2-1-1-10 Hagoromocho, Tachikawa-shi Cosmotec Co., Ltd. (72) Inventor Makoto Kuwahara 2-1-110 Hagoromocho, Tachikawa-shi, Tokyo F-term in Cosmotec Co., Ltd. 4F100 AK41A AK52B AK52B AR00C AR00D BA03 BA04 BA07 BA10A BA10D CA07B CB05 EJ91D GB41 JD09 JG01C JJ03 JL13B JN01A JN28 4J004 AA11 AA17 AB01 CA06 CC02 CE01 DA04 DB02 FA05 5C043 AA06 BB03 BB04 CC16 DD01 DD34 DD39 EB07

Claims (2)

[Claims] Claims: 1. A transparent polyethylene naphthalate film having a silicone-based pressure-sensitive adhesive layer containing an ultraviolet absorber,
An adhesive insulating sheet for an electrode sheet, comprising a film-like separator thereon. 2. A transparent pressure-sensitive adhesive comprising a silicone pressure-sensitive adhesive layer containing an ultraviolet absorber on a transparent polyethylene naphthalate film,
An electrode sheet comprising: a pair of electrode layers each having an adhesive layer thereon; and a film separator covering the pair of electrode layers.