公开(公告)号：JP2002050219A

公开(公告)日：2002-02-15

申请号：JP2000223484

申请日：2000-07-25

Applicant: IBM ,  STANLEY ELECTRIC CO LTD

Inventor： KATSU YOSHIHIRO ,  OSHIMA MASAKI ,  SUZUKI MASARU ,  OKI YOJI ,  OKI YASUYUKI

IPC: F21V8/00 ,  F21Y103/00

Abstract: PROBLEM TO BE SOLVED: To solve problems associated with prior surface light source apparatus, that when a light guide plate is provided with a prism to achieve slimming sown and cost reduction, irregular light is generated to decrease its performance. SOLUTION: The surface light source apparatus 10 includes a lamp 18 and a light guide plate 22. A light emission face 26 or its opposed face 28 of the light guide plate 22 has plural convex and concave parts which extend in the direction facing a light incident face 25 and spread over the light guide plate 22. The convex and concave parts have flat faces 32 on the bottoms of the concave parts or on the tops of the convex parts. In this configuration, the surface, light source apparatus 10 can transmit light in the axis direction of the light 18 and the problem associated with prior prism cut light guide plate such as low light at both end parts can be solved.