04350411 is referenced by 6 patents and cites 7 patents.

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.

Title
Transfer lens and head-down display using the same
Application Number
6/143532
Publication Number
4350411
Application Date
April 25, 1980
Publication Date
September 21, 1982
Inventor
Philip J Rogers
Clwyd
GB
Agent
F Eugene Davis IV
Assignee
Pilkington P E
GB
IPC
F02B 9/64
G02B 9/62
G02B 27/10
G02B 13/24
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