Film reader

A film reader comprising:

• a housing having an observation aperture;
• means for illuminating a film having an image thereon;
• a screen disposed in said housing and in opposition to said observation aperture for allowing an observer to observe from outside said housing an image projected thereon, said screen including a diffusion layer having an internal structure comprising a mixture of at least two synthetic resin substance melts which are optically transparent and non-soluble with respect to each other and which have different refractive indexes, said diffusion layer diffusingly reflecting light incident thereinto at the interface between the synthetic resin substances having different refractive indexes, and said screen further including a Fresnel lens provided on the diffusion layer and a rough surface formed on said Fresnel lens;
• and
• optical means, located within said housing, for projecting the image of the film onto said screen.

A reflection type screen, usable with a film reader, for observing an image projected thereon, comprising:

• a diffusion layer having an internal structure comprising a mixture of at least two synthetic resin substance melts which are optically transparent and non-soluble with respect to each other and which have different refractive indexes, said diffusion layer diffusingly reflecting light incident thereinto at the interface between the synthetic resin substances having different refractive indexes;
• a Fresnel lens provided on one of the surfaces of the diffusion layer;
• and
• rough surface formed on said Fresnel lens.

A film reader comprising:

• a housing having an observation aperture;
• means for illuminating a film having an image recorded thereon;
• a screen disposed in said housing and in opposition to said observation aperture for allowing an observer to observe from outside said housing an image projected thereon, said screen having a number of concentrically arranged ring strip surfaces having different inclination angles and having increasing diameters away from a common center of said ring strip surfaces, which center is located off said screen, the plane of the surface of said screen being disposed at an inclination relative to the horizontal plane and an end of said screen nearest to said common center being located adjacent to the observation aperture;
• and
• optical means for projecting the image of the film onto said screen;
• said screen including a diffusion layer having an internal structure comprising a mixture of at least two synthetic resin substance melts which are optically transparent and non-soluble with respect to each other and which have different refractive indexes, said diffusion layer diffusingly reflecting light incident thereinto at the interface between the synthetic resin substances having different refractive indexes, and said screen further including a rough surface formed on the diffusion layer.