Retro-focus type lens and projection-type display apparatus

Details Retro-focus type lens and projection-type display apparatus Retro-focus type lens and projection-type display apparatus

1992-12-30

1995-08-15

Sugarman, Scott J.

Optical: systems and elements

Lens

With field curvature shaping

359682, 359689, 359716, 359726, 359740, 359753, G02B 912, G02B 1304

Patent

active

054424844

ABSTRACT:
A retro-focus-type lens is provided from a large conjugate side with a first lens group having a negative refracting power, a second lens group having a positive refracting power which is spaced away from the first lens group at an air interval D1, and a third lens group having a positive refracting power. The following conditions are satisfied when focal lengths of the first lens group, the second lens group, the third lens group, and a total lens system are assumed respectively as f1, f2, f3, and f:

REFERENCES:
patent: 4699477 (1987-10-01), Clarke
patent: 4950055 (1990-08-01), Tatsuno
patent: 5042929 (1991-08-01), Tanaka et al.
patent: 5278698 (1994-01-01), Iizuka et al.

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