Autofocusing zoom lens system with beam splitter prism for singl

Details Autofocusing zoom lens system with beam splitter prism for singl Autofocusing zoom lens system with beam splitter prism for singl

1985-06-17

1987-09-15

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

350429, 350445, 354402, 354406, G03B 310

Patent

active

046941517

ABSTRACT:
An autofocusing zoom lens, comprising a half-mirror prism and a sensor capable of detecting light in conjunction with the half-mirror prism, is formed by inserting the half-mirror prism between the front-lens and rear-lens groups of the master-lens groups of the lens system. The insertion of the half-mirror prism has the advantages that the back focus may be shortened, the lens aperture need not be enlarged, and that the lens length in effect may be shortened. Additional use of a sensor-related lens makes autofocus available even when the angle of exit pupil of the imaging optical system is small.

REFERENCES:
patent: 3972056 (1976-07-01), Tsujimoto et al.
patent: 4185191 (1980-01-01), Stauffer
patent: 4333007 (1982-06-01), Langlais et al.
patent: 4506970 (1985-03-01), Fujibayashi
patent: 4529286 (1985-07-01), Fujii
patent: 4609944 (1986-09-01), Nakada et al.

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