Abstract
An off-axis flat-concave dual-mirror (FCDM) configuration
for an ultrashort focal length projection lens based on the digital light
processor (DLP) upright projection-type projector is proposed in this paper.
This projection lens is composed of two lens groups: the FCDM system and the
relay optical system. The flat mirror and the contour of the concave mirror
are determined according to the relationship between the chief ray from the
exit pupil of each field of view (FOV) and the corresponding assigned
position on the screen. A curved image is formed between exit pupil and
concave mirror, aiming to correct field curvature. The second lens group
consists of a set of conventional refractive lenses which convert a curved
object onto the image panel. Based on this method, a projection lens with an
ultrashort throw ratio (TR) of 0.34, including a full FOV 139.8
$^{\circ}$
and
distortion of less than 1%, is designed. Additionally, the colorimetric
performance, uniformity, optical efficiency and size of the designed
projector are analyzed. Results show that the proposed projector system with
high optical performance is compact and suitable for household or
educational applications.
© 2015 IEEE
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