| 摘要 |
<p>PURPOSE:To enable the forming of the title mark clearly indicating characteristics by burying a metal film in an external covering film, and exposing a part of the metal film so as to have a specified shape, by projecting laser light. CONSTITUTION:The surface part of a chip resistor 1 is covered with an external covering film 5 composed of resin, except electrodes 2, 2 on both ends. In the inside of the external covering film 5, an aluminum deposited film 3 as a metal film is buried. In order to form an indicating mark, the upper surface of the central part of the chip resistor 1 covered with the aluminum deposited film 3 and the external covering film 5 is irradiated via a mask 13 by laser light 15 such as CO2, YAG. Since the aluminum deposited film 3 reflects the laser light, it is left without damage, and exposed on the surface, so that characteristics indicating mark 7 is formed by said exposed aluminum deposited film 3. Thereby, the label mark is made distinct, and the reading error and illegibleness thereof can be eliminated.</p> |
