| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a plane light source device using a point light source capable of effectively emitting plane irradiating light of uniform brightness distribution suppressing light loss and with the smaller number of parts advantageous for downsizing. <P>SOLUTION: LED elements 1 as point light sources are arranged tightly on a light-incident face 2a of a light guide plate 2. An end face 2b opposing the light-incident face 2a of the light guide plate 2 is formed in a paraboloid curved face, to which a metal reflecting film 3 is fitted. One of a pair of main faces of the light guide plate 2 is a light-emitting face 2c and formed flat. On the other main face 2d opposite to the light-emitting face 2c, a light-path control pattern P made by arraying a plurality of protrusions 2d1 extended in parallel is formed. The light-path control pattern P totally reflects incident light toward a metal reflecting film 3 side, and totally reflects reflected light from the reflecting film 3 toward the light-emitting face 2c. <P>COPYRIGHT: (C)2004,JPO |
