FORMED BODY HAVING RECESSES AND PROTRUSIONS

摘要

According to the present invention, a resin plate is irradiated with a laser to thereby form recessed parts and protruding parts in a groove formed body. The resin plate is irradiated with the laser a plurality of times when the recessed parts and the protruding parts are formed in the resin plate. Consequently, because the resin plate is cooled when the irradiation from the laser onto the resin plate is temporarily stopped, ignition of the laser-irradiated portion of the resin plate can be suppressed and the depth dimensions of the recessed parts and the height dimensions of the protruding parts can be increased.