Projection lens system

Details Projection lens system Projection lens system

1992-12-30

1994-10-04

LaRoche, Eugene R.

Optical: systems and elements

Lens

With field curvature shaping

359634, 359650, 359708, G02B 1318, G02B 964

Patent

active

053531566

ABSTRACT:
A projection lens system includes a first lens group for correcting spherical aberration and coma aberration, a second lens group for correcting chromatic aberration, a third lens group for providing the main optical power for the whole system, and a fourth lens group for correcting petzval aberration. The first, second and third lens groups are sequentially disposed forward of a screen in front of a dichromatic mirror, and the fourth lens group is disposed between the CRTs and dichromatic mirror. Further, the fourth lens group and CRTs form an enclosure and are filled with transparent cooling oil, thereby accomplishing a high-resolution color image having no chromatic aberration and using a reduced number of lenses.

REFERENCES:
patent: 4764806 (1988-08-01), Altman
patent: 4842394 (1989-06-01), Buchroeder
patent: 4900139 (1990-02-01), Kreitzer
patent: 4963007 (1990-10-01), Moskovich
patent: 4976525 (1990-11-01), Matsumura et al.
patent: 4981352 (1991-01-01), Tejima et al.
patent: 5048940 (1991-09-01), Ueda et al.
patent: 5066113 (1991-11-01), Nakajima et al.
patent: 5168351 (1992-12-01), Bradley et al.

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