| 摘要 |
PURPOSE:To expand a range of a field of view, also to raise a balance of a light emission, and to secure a brightness by constituting so that a light which is made incident from a projection side and reflected by a total reflecting surface transmits through a part of a curved surface part, and forming a thin connecting surface between each lens unit. CONSTITUTION:In a back projection screen having a lenticular lens on an observation side, the lenticular lens is provided with a total refleting surface (1), and also constituted of a lens unit (1) provided with plural curves surface parts (12) so as to be connected between both side inclinations, more concretely speaking, from the tip of the total reflecting surface (11), and the screen is constituted by providing a thin and flat connecting surface between each lens unit (1). |
