G - Physics – 02 – B
Patent
G - Physics
02
B
G02B 27/18 (2006.01) G02B 27/14 (2006.01)
Patent
CA 2203266
A projection system (18) is described which efficiently combines the output from multiple lamps (19A, 19B) images of which are focused to a common point. The projected screen brightness is multiplied over that of a conventional single lamp of equivalent wattage. The screen brightness can be increased or diminished by switching individual lamps (19A, 19B) on or off, adjusting the light level for conventional overhead transparencies, or low transmission liquid crystal display projection panels.
La présente invention concerne un système de projection (18) qui combine de manière efficace la lumière fournie par plusieurs lampes (19A, 19B) dont les images sont concentrées en un point commun. La luminosité projetée sur l'écran est multipliée par rapport à celle d'une lampe unique classique de puissance équivalente. On peut accroître ou réduire la luminosité de l'écran en mettant en marche ou à l'arrêt des lampes individuelles (19A, 19B), ce qui règle le niveau de lumière pour les diapositives classiques de rétroprojection ou les panneaux d'affichage par projection à cristaux liquides, à faible taux de transmission.
Dreyer John Frederick
Fesler Robert Merl
Vanderwerf Dennis Frank
Minnesota Mining And Manufacturing Company
Smart & Biggar
The Minnesota Mining & Manufacturing Company
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