Transfer lens and head-down display using the same

Details Transfer lens and head-down display using the same Transfer lens and head-down display using the same

1980-04-25

1982-09-21

Stern, Ronald J.

350 45, 350412, 350463, 350464, G02B 1324, G02B 2710, G02B 962, F02B 964

Patent

active

043504116

ABSTRACT:
A transfer lens comprises a first field-flattening component of negative power, a second component of positive power providing overcorrect astigmatism, a third component of positive power consisting of a plurality of positive members providing most of the power of the overall lens and whose undercorrect astigmatism is corrected by the overcorrect astigmatism of the second component, and a fourth component of negative power which increases the field angle. The lens is particularly useful in a head-down display having two primary displays from which light travels to a combiner so that the transfer lens produces a combined image. A Fresnel field lens is preferably located at the image position.

REFERENCES:
patent: 2721499 (1955-10-01), Bertele
patent: 3297822 (1967-01-01), Braid
patent: 3366436 (1968-01-01), Rickless
patent: 3537771 (1970-11-01), Trufanoff
patent: 3732428 (1973-05-01), Spangler
patent: 4206975 (1980-06-01), Maeda

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