JPH032067B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a curved surface printing transfer body used for curved surface printing in which thick film paste is printed on the edge of a substrate of an electronic component such as a hybrid integrated circuit.

Configuration of conventional examples and their problems Conventional methods of printing on the curved surfaces of electronic components such as hybrid integrated circuits have been carried out using transfer paper, but since the transfer material is simply a sheet, the transfer position cannot be adjusted. The accuracy was poor, and those using paper as a material had the disadvantage that they could only be used once because the transfer was carried out by heat or moisture. A transfer body made of a non-stretchable material has poor elasticity and cannot be transferred with good adhesion to a sharply curved surface such as a corner of a substrate. Furthermore, transfer bodies made of highly elastic materials have the disadvantage of being difficult to position and transport.

Purpose of the Invention In view of the above-mentioned drawbacks, the present invention is designed to print a thick film paste on curved surfaces including corners such as the edges of electronic component substrates with high precision, good adhesiveness, and little change in film thickness, and to reuse the paste. The present invention provides a transfer body for curved surface printing that is possible and highly mass-producible.

Structure of the Invention The present invention has feed holes for transportation provided at a constant pitch on one or both sides, and a non-extendable relief hole provided at a constant pitch in the center to prevent the transfer device from hitting during printing. The rubber band is made up of a thin strip made of rubber, and rubber attached to one or both sides of the thin strip so as to cover the relief hole in the center with the thin strip as a core. Due to the non-stretchability of the ribbon used as the core,
The positioning accuracy is good, and the transport holes provided on one or both sides make transport and positioning easy. In addition, since the thick film paste is printed, pressed onto the substrate, and only the rubber is transferred, it follows the curved surface well, and the thick film paste has good adhesion to the substrate, and the transferred thick film paste It has a unique effect that the film thickness is uniform, it can be reused, and further, by making it endless, it is more suitable for mass production.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a front view of a transfer body for curved surface printing in an embodiment of the present invention. In FIG. 1, 1 is a non-stretchable ribbon. In this example, a 125 μm thick polyester film was used. 2
is a sprocket hole. The feed holes 2 are square holes provided at a constant pitch on both sides of the ribbon 1. 3 is an escape hole. The escape hole 3 is a square hole provided in the center of the ribbon 1 with a pitch four times the pitch of the sprocket holes 2,
In FIG. 1, it is indicated by a broken line. The size of the escape hole 3 is larger than the printing pattern and also larger than the tip of the transfer device that presses the transfer body against the printing target, so that the thin strip 1 does not come into contact with the printing target and the transfer device during transfer. It's becoming like that. 4 is rubber. The rubber 4 is attached to both sides of the ribbon 1 with adhesive so as to completely cover the escape hole 3, and the rubber on both sides is integrated at the escape hole 3. Moreover, it is not attached to the parts of the ribbon 1 where the sprocket holes 2 on both sides are provided. In this example, silicone rubber was used as the rubber 4. Figure 2 is A- in Figure 1.
It is an A sectional view. As can be seen in FIG. 2, there is no thin strip 1 in the central part of the transfer body used for printing and transfer, but only rubber 4.

The usage of the curved surface printing transfer constructed as described above will be explained below. FIG. 3 shows a front view of the transfer body printed with the thick film paste. 5 is a transfer body. The transfer body is made up of the ribbon 1 and the rubber 4 as explained above. 6 is a thick film paste. The transfer body 5 is positioned using the feed hole 2, and a thick film paste 6 is printed in a predetermined pattern on the surface of the rubber 4 in the center of the relief hole 3 by screen printing or the like. In this embodiment, there are four rectangular patterns arranged vertically. FIG. 4 shows a top view of the transfer body during transfer. 7 is a substrate, which is a printing target. 8 is a transfer device. The transfer body with the thick film paste printed on the surface of the rubber 4 is transferred and positioned to the transfer position using a feed hole. Board 7
The transfer device 8, which faces the transfer member with the transfer member in between, enters the escape hole of the transfer member, presses only the rubber 4 against the substrate 7, and transfers the thick film paste on the surface of the rubber 4 to the substrate 7.

As described above, according to this embodiment, since a non-stretchable ribbon is used for transportation and positioning, positioning accuracy is high and curved surface printing can be performed with high precision. In addition, since the rubber part is used for transfer and the printed thick film paste is transferred to the printing object in a suitably dry state, there is little change in the thickness of the transferred thick film paste. Since it is rubber that is pressed against the printing object during transfer, it stretches easily and the thick film paste has good adhesion to the printing object, even on sharply curved surfaces. Furthermore, since the transfer body is endless,
The printing process, the process of providing appropriate drying, and the transfer process can be repeated continuously, making it highly suitable for mass production.

In this embodiment, the thin strip 1 is made of polyester, but it may be made of other non-stretchable resin or metal. Also, although the feed hole 2 is a square hole, it goes without saying that it may also be a round hole.

Effects of the Invention As described above, the present invention uses a non-stretchable thin strip as the core of the transfer body, thereby achieving high printing accuracy and
In addition, by providing a feed hole in the thin strip for transportation,
It is easy to transport and has good positioning accuracy. Furthermore,
During transfer, the part that expands and contracts and comes into contact with the printing target is rubber, so thick film paste can be transferred to sharply curved surfaces, including corners such as the edges of electronic component boards, with good adhesion and little change in film thickness. It is reusable and highly mass-producible. Its practical effects are significant.

[Brief explanation of drawings]

FIG. 1 is a front view of a transfer body for curved surface printing according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line A-A in FIG. The front view and FIG. 4 are plan views of the transfer body during transfer. 1...Thin film, 2...Spread hole, 3...Escape hole,
4...Rubber, 5...Transfer body, 6...Thick film paste, 7...Substrate, 8...Transfer device.

Claims (1)

[Claims] 1. The core is a non-stretchable thin strip that has feed holes at a constant pitch on one side or both sides, and relief holes at a constant pitch in the central part used for printing. 1. A transfer body for curved surface printing, characterized in that rubber is attached to one or both sides of the ribbon so as to cover the relief holes of the part to be used, and a paste is formed on the rubber.