Abstract— A new projection optical system with an exceptionally wide field angle of 160° and a short projection distance of 125 mm for a 62‐in. screen has been developed. It is constructed based on the Direct Projection Method which does not require a back mirror. This paper presents a new optical design concept and the characteristics of a prototype optical system.
We have developed a new projection optics with the exceptionally wide field angle of 160 degrees and the short projection distance of 125 mm with a 62 inch screen. It is constructed based on the Direct Projection Method which does not need a back mirror. In this paper, we will describe our new optical design concept and the characteristics of a prototype optical system.
We have developed a lens‐shiftable front projector of DLP™ system adopting a nontelecentric system that uses no prisms. The f‐number of projection lens was composed smaller than the f‐number of illumination optical system, and that, a fixed aperture was provided on the incidence side of the projection lens. This arrangement allowed us to realize a bright and high‐contrast optical system with a compact structure.
-A microcapsule diffuser of the transparent type is proposed to reduce the speckle noise generated on a laser display. This diffuser has a microcapsule that is secured between two transparent electrodes. The microcapsule contains light diffusion particles that are electrically charged. Because the particles in the microcapsules are moved by the electric field, the proposed device reduces speckle noise. This paper reports the results of one study of the device reliability.
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