Abstract
This study presents a new optical system for a combiner-type
head-up display (HUD) with a cylindrical lens as an asymmetrical
aberration corrector, instead of a freeform mirror. In the initial design
process based on off-axial aberration analysis, we obtain an off-axis
two-mirror system corrected for linear astigmatism and spherical
aberration by adding a conic secondary mirror to an off-axis paraboloidal
mirror. Thus, since the starting optical system for an HUD is corrected
for dominant aberrations, it enables us to balance the residual
asymmetrical aberrations with a simple optical surface such as a cylinder,
not a complex freeform surface. From this design process, an optical
system for an HUD having good performance is finally obtained. The size of
the virtual image is 10 inches at 2 meters away from a combiner, and the
area of the eye box is 130×50
mm2.
© 2016 Optical Society of Korea
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