| 摘要 |
<p>A microprism matrix manufacturing method which is suitable for the production of a corner cube type retro reflector, especially, a thin, retro reflecting sheet, and which enables the production of a hexagonal prism type microprism having both a high luminance and a high pantoscopicity. This method of manufacturing corner cube type microprism matrices comprises the steps of laminating a plurality of flat plates each of which has two parallel surfaces, cutting V-shaped recesses at a predetermined pitch in one surface of the resultant laminate of flat plates so that the recesses are arranged in the direction at right angles to a side of the laminate, whereby continuous roof type projections with an apex angle of about 90° are formed, and thereafter moving each flat plate so that the apex portions of the roof type projections formed thereon agree with the bottom portions of the V-shaped recesses formed in the adjacent flat plate, characterized in that each of the flat plates comprises a synthetic resin plate with a thickness of 50-500 νm and a Rockwell hardness of not lower than 70.</p> |
