Appeal No. 1998-1088 Page 2
Application No. 08/523,809
light from an image source behind the screen is projected
along a projection axis to the front of the screen. When
there are many viewers, the horizontal viewing angle must be
large to allow them all to see a bright image. Also, a large
horizontal viewing angle permits viewers to be situated
somewhere other than directly in front of the screen.
A conventional projector screen features a Fresnel lens
that collimates light received from and magnified by a
projection lens. In front of the Fresnel lens, parallel
lenticular lenses form a lenticular lens system. The
lenticular lenses form an image by spreading the collimated
light. A projection panel is positioned on the viewing side
of the lenticular system. Between the rear of the panel and
the front of the lenticular lenses, projecting parts absorb
part of the light spread from the lenticular lenses. The
projecting parts comprise black stripes painted between
adjacent lenticular lenses and extend outwardly from the
surface of the lenticular system. Such extension limits the
light-scattering angle of the individual lenticular lenses,
thereby restricting the horizontal viewing angle.
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