Kuraray Co., Ltd.

Ken Abe

Ichiro Matsuzaki

Hiroshi Kuwada

Masao Otaki

A double-sided lenticular lens sheet has an entrance lens layer and an exit lens layer, at least said exit lens layer containing light-diffusing fine particles, and has parameters satisfying the following expressions (I) and (II). ##EQU1## wherein t.sub.1 represents a thickness of the entrance lens layer; t.sub.2, a thickness of the exit lens layer; .DELTA.n.sub.1, a difference in refractive index between the thermoplastic resin and the light-diffusing fine particles in the entrance lens layer; .DELTA.n.sub.2, a difference in refractive index between the thermoplastic resin and the light-diffusing fine particles in the exit lens layer; c.sub.1, a weight concentration of the light-diffusing fine particles in the entrance lens layer; c.sub.2, a weight concentration of the light-diffusing fine particles in the exit lens layer; .rho..sub.1, a gravity of the light-diffusing fine particles in the entrance lens layer; .rho..sub.2, a gravity of the light-diffusing fine particles in the exit lens layer; d.sub.1, an average particle diameter of the light-diffusing fine particles in the entrance lens layer; and d.sub.2, an average particle diameter of the light-diffusing fine particles in the exit lens layer. The lenticular lens sheet of the present invention can be used in transmission-type projection screens. It can be stably manufactured even when its pitch is made very small, and yet can ensure a sufficient visual field angle, and also can improve the transmission efficiency of light to obtain a bright picture.

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Nakajo, Japan

Ken Abe