Projection screen and apparatus for the fabrication thereof

Details Projection screen and apparatus for the fabrication thereof Projection screen and apparatus for the fabrication thereof

G - Physics

03

B

90/2, 88/90, 342

G03B 21/60 (2006.01)

Patent

CA 1048316

ABSTRACT OF THE DISCLOSURE A projection screen of improved aesthetic quality. The screen comprises a plurality of rectilinear rows of pre- cisely contoured optical microelements each adapted to re- distribute substantially all of the incident image flux through a predefined audience angle with uniform luminance. The microelements are formed in a surface of a work piece by applying an electrical signal of predefined waveform but of random frequency to the input of the cutting stylus of a sound recording head which moves relative to the work piece in a series of parallel traverses. The electrical signal is recorded on a memory element which moves with the work piece past a stationary pickup head as each row is cut. Because the same signal from the memory element is used to cut each row, an identical phase relationship is maintained between the microelements in adjacent rows.

248575

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