Projection lenses for display elements and projection systems co

Details Projection lenses for display elements and projection systems co Projection lenses for display elements and projection systems co

1997-03-21

1998-10-13

Sugarman, Scott J.

Optical: systems and elements

Lens

With field curvature shaping

359651, G02B 934, G02B 912

Patent

active

058221280

ABSTRACT:
Telecentric retrofocus lenses and projection systems comprising such lenses are disclosed. The lenses are compact and provide a wide field of view (>70.degree.) with effective distortion correction. The lenses comprise, in order from the image side, a first lens group G1, comprising an aspheric lens having a negative focal length, an aperture, and a second lens group having a positive focal length and having a lens that has maximum refractive power among the lenses of the second lens group. Conditions apply to the ratio of the focal lengths of the first and second lens groups and the distance between the aperture and the focal length of the lens within the second lens group having maximum refractive power. The conditions effectively provide compact, wide-field, low-aberration images. Projection systems using these lenses are also disclosed.

REFERENCES:
patent: 4697892 (1987-10-01), Betensky
patent: 5519537 (1996-05-01), Shikama
patent: 5633757 (1997-05-01), Park

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