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    Lenticular lens sheet
    1.
    发明授权
    Lenticular lens sheet 失效
    透明镜片

    公开(公告)号：US5196960A

    公开(公告)日：1993-03-23

    申请号：US784513

    申请日：1991-10-29

    Applicant: Ichiro Matsuzaki ,  Hiroshi Kuwada ,  Masao Otaki ,  Ken Abe

    Inventor： Ichiro Matsuzaki ,  Hiroshi Kuwada ,  Masao Otaki ,  Ken Abe

    IPC: G03B21/62

    CPC classification number: B29D11/00288 ,  G03B21/625

    Abstract: 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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