Focusing system for videoprojector

Details Focusing system for videoprojector Focusing system for videoprojector

2006-04-11

2006-04-11

Perkey, W. B. (Department: 2851)

Optics: image projectors

Particular condenser

C353S031000

Reexamination Certificate

active

07025465

ABSTRACT:
Abstract Focusing system of the light beam for a videoprojector or comprising at least an image microforming device DMD (Digital Micromirror Device); the main feature of the system consisting in that it comprises at least an aspheric lens associated to at least an achromatic doublet. This configuration allows a substantial reduction of chromatic aberration, spherical aberration, curvature of field and the distortions, obtaining a more homogeneous illumination of the image microforming device.

REFERENCES:
patent: 5210646 (1993-05-01), Mercado et al.
patent: 6315415 (2001-11-01), Hayashi et al.
patent: 6439726 (2002-08-01), Piehler
patent: 6552740 (2003-04-01), Wong et al.
patent: 2002/0118310 (2002-08-01), DeLong

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