Underwater camera focus adapter

Details Underwater camera focus adapter Underwater camera focus adapter

1978-11-17

1979-09-25

Hix, L. T.

354 64, G03B 1712

Patent

active

041688970

ABSTRACT:
An adapter for an underwater camera which provides an extension to move the lens outward and increase the lens to film plane distance, so that the camera can focus on a close object. An alignment frame is attached to the adapter to aid in positioning the camera relative to the object. Pressure differential between the inside of the camera and the surrounding water, which normally distorts the camera body and throws the lens out of precise focus, is accommodated by a floating sealing ring which seals the lens barrel to the camera body. Within the sealing ring the lens barrel is locked firmly to the adapter and the adapter is locked firmly to the camera body. The structure is adaptable to various types of lens mountings.

REFERENCES:
patent: 3001462 (1961-09-01), D'Oplinter
patent: 3162106 (1964-12-01), D'Oplinter
patent: 3498695 (1970-03-01), Brouwer
patent: 3682069 (1972-08-01), Lecoeur
patent: 3906534 (1975-09-01), Shirasaki
Eastman Kodak Research Disclosure: "Focus Compensated Lens", p. 86, 6-1973.

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