Compact lens system operable in different mediums

Details Compact lens system operable in different mediums Compact lens system operable in different mediums

1980-07-09

1982-08-31

Evans, F. L.

350463, G02B 964

Patent

active

043469663

ABSTRACT:
The present invention is directed to a compact lens system equally operable in both air and water, comprising a first lens group having a front surface directly facing the air or water medium, the center of the curvature of the front surface being located approximately at the entrance pupil of the lens system, and a second lens group located at the image side of the first lens group with an air space formed between the first and second lens groups. The air space and design parameters being selected in the lens system so that the field curvature of the lens system is mainly changed without any substantial change in other aberrations when the air space is changed, wherein the air space is changeable by a predetermined value in response to the change between use in air and use under water for maintaining a relatively flat image surface.

REFERENCES:
patent: 3586419 (1971-06-01), Wakimoto et al.
patent: 3904275 (1975-09-01), Noguchi et al.
Optical Problems Under Water by Y. Shimizu and Y. Matsui (Lens used with spherical shell).

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