To provide a method for making optical parts (for example, surface light source elements) which is capable of unifying the sizes of projecting parts of an optical film formed with fine rugged patterns on its front surface and a base material film, such as a light transmission body, or the adhered parts to the base material film.
(1) The projecting parts of the optical film provided with the fine rugged patterns on its front surface and the base material film are adhered by using an adhesive of a hot melt type which causes phase transition between solid and liquid according to a temperature change or (2) the projecting parts of the optical film and the base material film are adhered by using an adhesive of a sol-gel transition type which causes sol-gel transition according to a temperature change.
HIRAMATSU SHINJI
FUJISAWA KATSUYA
Next Patent: LENS ADHERING METHOD AND LENS HOLDING METHOD