1
Adrianus H J van den Brandt, Wilhelmus A G Timmers: Optical illumination system and projection apparatus comprising such a system. U S Philips Corporation, Norman N Spain, March 24, 1992: US05098184 (136 worldwide citation)

An efficient illumination system for an image projection apparatus is described, which system comprises a radiation source (20), a concave reflector (21) and a first and a second lens plate (25, 28) each being provided with a matrix of lenses (26, 29) for forming superimposed images of the radiation ...


2
Wilhelmus A G Timmers: Image projection system with autofocusing. U S Philips Corporation, Norman N Spain, March 21, 1995: US05400093 (52 worldwide citation)

An image projection device comprising at least one display panel (26, 27, 28), a projection lens system (C) and a focus error detection system (FS) is described. Since the radiation source (50) and the radiation-sensitive detector (51) of the focus error detection system are arranged in planes which ...


3
Jill F Goldenberg, Wilhelmus A G Timmers: Modulation system for projection display. U S Philips Corporation, Bernard Tiegerman, October 22, 1991: US05060058 (49 worldwide citation)

In a liquid crystal projection t.v. system the color gradient over the projected image, which is due to angular sensitivity of the dichroic mirrors, is minimized by introducing a field lens (61,62,63) next to the light values or LC-panels (21, 22, 23) in the light paths of the blue (b.sub.B), green ...


4

5
Tako K A M Bronswijk, Karianne H Lindenhovius, Wilhelmus A G Timmers: Multi-function monitoring module for a printer. Koninklijke Philips Electronics, Aaron Waxler, September 27, 2005: US06948793 (3 worldwide citation)

In a module for monitoring the print quality of a dot printer (10), comprising a radiation source (41), a condenser lens system (43′) for forming an illuminated area (45) on a printing medium (13) and an imaging lens system (87,89) for imaging the illuminated area on a detector (49′), the detector c ...