| 摘要 |
To provide a lenticular lens sheet where separation, or wrinkling or undulation is prevented from occurring in a manufacturing stage and a projection screen with the lenticular lens sheet. Constructed is a composite lenticular lens sheet that is disposed on a light-emission surface side of the Fresnel lens sheet and on the light-incidence surface side and on the light-emission surface side of that there are used respectively different plastic materials. In this composite lenticular lens sheet, the following assumption is made. Regarding the light emission surface side material, Ta (° C.) represents the glass transition point; Am (1/° C.) represents the coefficient of linear expansion at a temperature equal to or higher than Ta; and As (1/° C.) represents the coefficient of linear expansion at a temperature equal to or lower than Ta, while, regarding the light-incidence surface side material, Tb (° C.) represents the glass transition point; Bm (1/C°) represents the coefficient of linear expansion at a temperature equal to or higher than Tb; and Bs (1°/C) represents the coefficient of linear expansion at a temperature equal to or lower than Tb; and Tx (° C.) represents a predetermined temperature equal to or higher than each of the Ta and Th. Under this assumption that the light-emission surface side and light-incidence surface side materials are selected so that the following relations may hold true. (Tx-Ta) Am+(Ta-25) As>(Tx-Th) Bm+(Th-25) Bs
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