Optical: systems and elements – Projection screen – Unitary sheet comprising plural refracting areas
Patent
1999-03-25
2000-03-07
Gray, David M.
Optical: systems and elements
Projection screen
Unitary sheet comprising plural refracting areas
359460, G03B 2156, G03B 2160
Patent
active
060348178
ABSTRACT:
An image projection beam transmission apparatus includes a sheet of optical bulk material having a planar material exit surface and an optical surface. An optical axis is substantially perpendicular to a plane defined by said optical surface. The optical surface comprises a matrix of focusing lens units. Each focusing unit has separate and distinct optical refracting curvature in both a first principle axis, which is perpendicular to the optical axis and a second principle axis, also perpendicular to said optical axis. The first principal axis is perpendicular to the second principal axis. Each of the optical focusing elements is disposed in substantially contiguous and integral relation, and repeats along the first and second principle axes. Each lens unit comprises an optically transmitting refractive surface constructed by displacing in the optical axis with respect to the first principle axis a singularly distinct and constant second order curve residing in a plane defined by the optical axis and the second principle axis.
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Gray David M.
Mahoney Christopher
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