| 摘要 |
PURPOSE: A pattern molding method of light guide pattern is provided to achieve even brightness by performing scattering and diffusion of light in a concentric circle form and to improve quality. CONSTITUTION: An In-line recess(2) is molded at the plate side of light guide pattern(1) using a ring shape cutter. Another In-line recess is molded using a cutter at the plate side of light guide pattern in an orthogonal direction with the in-line recess. The depth of the in-line recess is controlled according to position. [Reference numerals] (AA) One diagonal pattern groove forming process |
