| 摘要 |
PURPOSE:To expand a view angle by constituting a titled screen so that incident light is totally reflected once, and thereafter, transmits through the top face and is emitted, and constituting a lenticular by using two or more lens elements whose inclined angles of the total reflecting surface are different from each other, as a unit. CONSTITUTION:A titled screen consists mainly of a lens 11 provided with a total reflecting surface T by which light made incident as a lenticular 1 on a surface A of an observation side is totally reflected once, and thereafter, transmits through a top face P and is emitted, and is formed by combining a cylindrical lens 12 whose section is circular or non-circular, with said lens. According to such a constitution, a range of emission is determined by an inclined angle theta of its set total reflecting surface T, two or more lens elements whose inclined angles theta are different from each other, for instance, a lens 11 is constituted of two lens elements 11a, 11b, and it is formed by placing the cylindrical lens 12 between these lenses 11. In this way, the lens having the total reflecting surface for constituting the lenticular in the vertical direction is constituted as two or more lens element units whose inclined angles of the total reflecting surface are different from each other, therefore, the view range can be further expanded. |
