| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for efficiently molding a light guide plate, with which various kinds of light guiding plates can be efficiently obtained and the change of light guide plate patterns is easy. SOLUTION: This light guide plate is obtained by injection-molding synthetic resin in a mold, on one side or both sides of a mold member consisting of the cavity of which a stamper or stampers having the optical pattern of the light guide plate thereon and the thickness of 0.1-0.6mm are installed. In the used mold, on the surface, on which the stamper is to be installed, of the mold member 2, grooves 3 or holes are formed so as to allow to suck the stamper onto the mold member by vacuumizing through the grooves 3 or the holes. The vacuumizing grooves or holes are preferably formed at the positions excluding the domain, within which the optical pattern of the light guide plate is formed. The surface roughness at the rear surface of the stamper is preferably finer than the roughness of the optical pattern of the light guide plate. |
