JPH0120800Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention relates to a thermocompression sealing machine, and more specifically, is suitable for thermocompression sealing, for example, of an electroluminescent lamp element in an organic electroluminescent lamp with a resin outer film. .

BACKGROUND OF THE INVENTION Organic electroluminescent lamps (hereinafter abbreviated as EL) are used as backlights for liquid crystal display devices and the like because of their thinness, uniform brightness, and light weight. Figure 1 is disclosed in, for example, Japanese Patent Publication No. 40-8575.
A plan view of the EL is shown, and FIG. 2 is a cross-sectional view in which a part of the cross section taken along the line - in FIG. 1 is enlarged in a circle. In the figure, 1 is an EL element, which is sandwiched between two transparent resin outer films 2 and 3 made of polyethylene etc. from above and below, and the peripheral edges of both resin outer films 2 and 3 protruding from the EL element 1 are heated. It is crimped and sealed. As is clear from FIG. 2, the EL element 1 includes a back electrode 4 made of aluminum foil or the like, and a reflective insulator made of a mixture of white high dielectric constant powder such as barium titanate in a high dielectric constant organic material such as cyanoethyl cellulose. Layer 5: Zns activated with copper in a high dielectric constant organic material such as cyanoethyl cellulose
It is formed by sequentially laminating a light-emitting layer 6 in which a phosphor powder such as phosphor powder is dispersed, and a transparent resin sheet 8 on which a transparent electrode 7 is formed on the lower surface. The back electrode 4 and the transparent electrode 7 are each electrically connected to leads 10 and 11 made of a phosphor bronze plate or the like.

The above EL is usually manufactured as shown in FIGS. 3 to 7. First, as shown in FIG. 2, a back electrode 4, a reflective insulating layer 5, a light emitting layer 6, a transparent electrode 7, and a transparent resin sheet 8 are sequentially laminated. are connected to produce an EL element assembly 12 in which a large number of EL elements 1, 1, ... are formed in series (the third
), a large number of EL elements 1, 1, ... are manufactured by cutting and separating the parts adjacent to each current collecting band 9 (the fourth
), these EL elements 1, 1, ... are sandwiched between two long resin outer films 2, 3 at a predetermined interval (Fig. 5), and the EL elements of both resin outer films 2, 3 are
The parts protruding from the elements 1, 1, ... (shaded areas in the figure) are sealed by thermocompression (Fig. 6), and each EL element 1,
1. Cut the middle part of... (Figure 7).

Incidentally, in the thermocompression sealing process shown in FIG. 6, a thermocompression sealing machine as shown in FIG. 8 has conventionally been used. In the figure, reference numerals 13 and 14 denote a pair of thermocompression rollers, each having heat-resistant rubber 17 and 18 fixed around rigid core rods 15 and 16 made of metal cylinders each containing a built-in heater. The length L of the heat-resistant rubbers 17 and 18 is set to be larger (L>) than the maximum width of the EL element 1 and the resin outer films 2 and 3, which are the thermocompression sealing objects a.

Then, as shown in FIG. 9, both thermocompression rollers 13 and 14 are rotated at a constant speed in the direction of the arrow, and the heaters are energized to bring the surface temperature of the heat-resistant rubbers 17 and 18 to a predetermined value. , both thermocompression rollers 1
The EL element 1 and the resin outer films 2 and 3 are inserted between 3 and 14. Then, heat-resistant rubber 17, 18
is deformed to accept the thermocompression bonded sealing material a, and
Resin outer films 2 and 3 protruding from EL element 1
is sealed by thermocompression. However, heat-resistant rubber 17,
18 has a certain hardness, it does not deform in response to the step of the thermocompression sealing object a, and as shown in FIG. 9, gaps 19, 19 are formed at both ends of the EL element 1, As shown in FIG.
is packed. If the air bubbles 21, 21 are packed along the EL element 1, not only will the thermocompression sealing of the resin outer films 2, 3 be insufficient, but also the moisture contained in the air bubbles 21, 21 may be harmful. There was a problem in that the lifespan of EL was significantly shortened depending on the material.

Purpose of the invention Therefore, the object of this invention is to provide a thermocompression sealing machine that does not cause air bubbles to be packed in the stepped portion of the thermocompression sealed object.

Structure of the invention This invention is characterized in that a heat-resistant elastic body made of heat-resistant rubber or the like is divided into a plurality of pieces by forming slits at positions corresponding to the step portions of the sealed object to be sealed by thermocompression.

That is, according to the above configuration, the heat-resistant elastic body can be deformed independently using the slit corresponding to the stepped portion of the thermocompression sealing object as a boundary, so that the thermocompression sealing of the resin outer film is completely achieved. Air bubbles are no longer packed in the step portion of the thermocompression-bonded object, and it is possible to prevent a reduction in the sealing interface length and deterioration of the thermocompression-bondable object due to harmful substances contained in the bubbles.

Embodiment Hereinafter, a thermocompression sealing machine according to an embodiment of this invention will be described with reference to the drawings.

FIG. 11 shows a cross-sectional view. In the figure, 30,
Reference numeral 31 denotes a pair of thermocompression bonding rollers, each of which has heat-resistant elastic bodies 34, 35 such as heat-resistant rubber fixed around rigid core rods 32, 33 such as metal cylinders each having a built-in heater. 35 is divided into relatively long central portions 34a, 35a and end portions 34b, 34c and 35b, 35c on both sides thereof by circumferential slits 36, 36, 37, 37. The length dimension M of each heat-resistant elastic body 34, 35 is set larger than the maximum width dimension m of the EL element 1 and the resin outer film 2, 3, which are the thermocompression sealing objects a, and the respective central portions 34a, 35a
The length dimension N is slightly larger than the width dimension n of the EL element 1 corresponding to the stepped portion of the thermocompression sealing object a,
That is, the size is set to be the width dimension n of the EL element 1 plus the thickness dimension of the resin outer films 2 and 3. The central portions 34a, 35a and both end portions 34b, 34c and 35b, 35c are constructed such that each portion can be deformed independently by slits 36, 37, respectively.

In the above configuration, as shown in FIG.
Both thermocompression rollers 30 and 31 are rotated at a constant speed in the direction of the arrow, and after energizing the heater to bring the surface temperature of the heat-resistant elastic bodies 34 and 35 to a predetermined value, a , thermocompression sealing object a
EL element 1 and resin outer film 2, 3
Insert. Then, the heat-resistant elastic bodies 34 and 35 are deformed to accept the thermocompression sealing object a, and the resin outer films 2 and 3 protruding from the EL element 1 are thermocompression sealed. Here, each heat-resistant elastic body 34, 35
is divided by the slits 36, 37 into the central portions 34a, 35a and both end portions 34b, 34c and 35b, 35c, as described above, and the length N of the central portions 34a, 35a is equal to the EL element 1.
By setting the width slightly larger than the width dimension of the center portions 34a, 35a and both end portions 34
b, 34c and 35b, 35c are the slits 36, 3, depending on the thickness of the thermocompression sealed object a.
Transform separately using 7 as a boundary. For this reason, EL
The part of the element 1 is firmly sealed by thermocompression by the central parts 34a, 35a, and the parts of the resin outer films 2, 3 protruding from the EL element 1 are sealed by the end parts 34b, 34c and 35b, 35c. The entire surface is tightly sealed by thermocompression, and gaps 19, 19 as shown in FIG. 9 are not formed on both sides of the EL element 1, so that the EL after sealing has no gaps 19, 19 as shown in FIG. 10. The bubbles 21, 21 are not packed together.

In addition, in the above embodiment, each heat-resistant elastic body 34, 35
Although the explanation has been made on the assumption that the material is uniform, the elastic force of the center portions 34a and 35a corresponding to the thick portions of the thermocompression sealing object a is expressed as ,35
The elastic force c may be set to be larger than the elastic force c so that a substantially uniform pressing force is applied to the entire surface of the object a to be sealed by thermocompression.

Further, in the above embodiment, both thermocompression rollers 30,
Although the case where the heater is built into the core rods 32 and 33 of 31 has been described, it is also possible to fill the core rods 32 and 33 with graphite or the like and perform high frequency induction heating from an external high frequency power source.

Furthermore, this invention can be used not only for thermocompression sealing of ELs, but also for thermocompression sealing of other electronic components, foods, etc.

Effects of the invention As described above, this invention divides the heat-resistant elastic body into a plurality of pieces by forming slits at positions corresponding to the step portions of the thermocompression-bonded sealing material. As a result of the corresponding deformation of the heat-resistant elastic body, air bubbles are not packed along the stepped portion, and a reduction in the sealing interface length and deterioration due to harmful substances such as moisture contained in the air bubbles can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an organic electroluminescent lamp, and FIG. 2 is a cross-sectional view showing a part of the cross section taken along the line - in FIG. 1, enlarged within a circle. FIGS. 3 to 7 are plan views of each stage for explaining a method of manufacturing a general organic electroluminescent lamp. FIG. 8 is a sectional view of a conventional thermocompression sealing machine used in the thermocompression sealing process of FIG. 6, and FIG. 9 is a sectional view during thermocompression sealing. FIG. 10 is a plan view of an organic electroluminescent lamp for explaining the drawbacks of the conventional thermocompression sealing machine. FIG. 11 is a sectional view of a thermocompression sealing machine according to an embodiment of this invention, and FIG. 12 is a sectional view during thermocompression sealing. 1... EL element, 2, 3... resin outer film,
30, 31... Heat compression roller, 32, 33... Core rod, 34, 35... Heat resistant elastic body (heat resistant rubber), 3
4a, 35a... central part, 34b, 34c, 3
5b, 35c...both end portions, 36, 37...slit, a...thermocompression sealing object.

Claims (1)

[Claims for Utility Model Registration] 1. The object to be sealed by heat and pressure is passed between a pair of heat and pressure rollers, each of which is formed by covering the outer periphery of a rigid core rod with a built-in heating element with a heat-resistant elastic material, to seal it by heat and pressure. A thermocompression sealing machine, characterized in that the heat-resistant elastic body is divided into a plurality of pieces by forming slits at positions corresponding to step portions of the thermocompression sealing object. 2 Among the heat-resistant elastic bodies divided by the slits, the elastic force of the portion corresponding to the thick portion of the thermocompression-bonded sealing material is set to be larger than the elastic force of the portion corresponding to the thin portion. A thermocompression sealing machine according to claim 1 of the utility model registration claim.