Photo-taking lens for an underwater camera

Details Photo-taking lens for an underwater camera Photo-taking lens for an underwater camera

1992-03-23

1993-10-26

Arnold, Bruce Y.

Optical: systems and elements

Lens

Multiple component lenses

359684, 359686, G02B 934, G02B 1514

Patent

active

052571378

ABSTRACT:
A lens for an underwater camera is comprised of a first lens unit having no refractive power or having weak refractive power, a second lens unit comprising a forward unit having negative refractive power and a rearward unit having positive refractive power, and having weak refractive power, a third lens unit having positive refractive power, and a fourth lens unit having negative refractive power, the first lens unit being fixed relative to the image plane, the second lens unit and the third lens unit being axially moved together on the optical axis toward the object side relative to the fourth lens unit.

REFERENCES:
patent: 5168402 (1992-12-01), Mihara

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