Kuraray Co., Ltd.

Matsushita Electric Industrial Co., Ltd.

Matsushita Electric Co., Ltd.

Hiroshi Kuwada

Ichiro Matsuzaki

Katsuaki Mitani

Noboru Yasumatsuya

Ken Abe

Masao Otaki

A lenticular lens provided on the viewer side of a transmission type screen is composed of at least two layers, that is, a surface layer and a base layer at least one of which contains a light dispersing material, and a visible light absorbing material is mingled in at least one of these two layers, or in the light dispersing material, thereby enhancing the image contrast of the transmission type screen.

Transmission type screen and method of manufacturing thereof

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.

Lenticular lens sheet

Growing community of inventors

Niigata, Japan

Hiroshi Kuwada