| 摘要 |
PURPOSE:To provide an easily visible mark on a surface of a molded article with favorable productivity, by a method wherein capsules containing a coloring matter are incorporated into a material for a molded article, and after molding, the surface of the molded article is irradiated with energy to break capsule films. CONSTITUTION:The capsules 2 each of which has a coloring matter 3 such as a pigment or a dye sealed in the film 4 are mixed into a resin which is a molding material for obtaining the molded article 1. The film 4 has the same color as that of the resin, so that the capsules mixed in the resin can not be distinguished from the resin. The resin containing the capsules 2 is molded by a transfer molding method or the like, for example to produce a non-airtight sealed package of a semiconductor device, and then the molded article 1 is irradiated with laser light 6 through a mask 8 and a lens 10. Accordingly, a projected image analogous to a pattern 9 formed in the mask 8 is produced on the surface of the article 1, whereby the films 4 of the capsules 2 contained in the resin are broken, the coloring matter 3 is exposed to produce the mark 5. |
