TRANSFER MOLDING METHOD OF LIGHT GUIDE PLATE, LIGHT GUIDE PLATE, AND SURFACE LIGHT SOURCE DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a transfer molding method in which positional deviation upon molding between periodical patterns hardly offer a problem, in the transfer molding method of a light guide plate having at least two kinds of periodical patterns (shapes).SOLUTION: Light sources 32 are arrayed with a prescribed array pitch P on a portion opposite to a light incident surface of a light guide plate 33. A first shape 18 (directional conversion pattern) is provided on an area adjacent to the light incident surface, of the upper surface of the light guide plate 33. The first shape 18 has the same period as the pitch P of the light sources 32. Second shapes 19a (light emission part) is provided on an area in close vicinity to the first shape 18 of the upper surface of the light guide plate 33. The second shapes 19a are collected between the light sources and are arranged with the same period as the pitch P. Third shapes 19b (light emission part) are provided on the lower surface of the light guide plate 33. The third shapes 19b are arranged side by side with a period of one by an integer of the pitch P in the width direction.