Patent ID: 6900945
Filing Date: 2005-05-31
Classification: G03B

Abstract:
1. A lenticular lens sheet for use in a rear projection screen that allows imaging light emitted from an image source, the imaging light being incident on a rear of the screen, to emerge toward a viewer's side, comprising: a plurality of lens elements of incidence arranged on an incidence side; and a plurality of lens elements of emergence arranged on an emergence side, wherein a light that has passed through each of the lens elements of incidence converges via a protruding apex of a corresponding lens element of emergence; a lens plane of a center portion of each of the lens elements of emergence, a width of the center portion being a half of a total lens width, is in a shape defined by a curved line fulfilling the conditions expressed by the following numerical formulae (1) to (4): a lens plane of each side portion of each of the lens elements of emergence, a width of the each side portion being a quarter of the total lens width, is in a shape defined by a curved line fulfilling the conditions expressed by the following numerical formulae (5) to (8): the curved lines defining the shape of the lens plane of each of the lens elements of emergence, given by the above numerical formulae (1) to (8), are on the x-y coordinates, and in these numerical formulae,