| 摘要 |
Chip-type electronic devices are produced by providing a base board which is later to be cut into rectangular substrates, forming longitudinally and transversely aligned throughholes through the base board, forming electrode patterns on the base board, attaching semiconductor elements on the electrode patterns, filling the throughholes with a solder material, heating and cooling to solidify the solder material such that it shrinks to an intermediate height below the top surface of the base board, covering the top surface completely with a resin mold and then cutting the base board into the individual substrates. Each device thus produced has a substrate with a vertically extending groove formed on each of its mutually opposite edges. A solder material fills these grooves partially to a height which is below the top surface of the substrate. Electrode patterns are formed on these edges of the substrate including the inner surfaces of these grooves. A semiconductor electronic element is attached onto the top surface of the substrate. A resin mold seals the entire top surface of the substrate inclusive of the semiconductor element, extending to positions of the edges of the substrate and protruding partially into the grooves so as to serve as hooks to securely attach to the substrate.
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