Optical system for TTL automatic focusing video camera

Details Optical system for TTL automatic focusing video camera Optical system for TTL automatic focusing video camera

1984-11-21

1987-03-24

Rubinson, Gene Z.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358225, 354406, 250201, G03B 300, G03B 1318

Patent

active

046529314

ABSTRACT:
An optical system for a TTL automatic focusing video camera in which a beam splitter employed in the optical system is formed of at least two totally reflecting surfaces disposed on opposite sides of an optical axis of a main image pickup lens forming an angle with respect thereto of 90.degree. in the lateral direction and 45.degree. in the longitudinal direction., An abberation correction lens is arranged on opposite sides of the optical axis form the main image pickup lens. A light beam reflected and converged by a totally reflecting surface provided at a rear of the aberration correction lens is allowed to pass by the totally reflecting surfaces of the beam splitter to reach the automatic focusing sensor.

REFERENCES:
patent: 4148584 (1979-04-01), Roelants
patent: 4197006 (1980-04-01), Maillet
patent: 4272684 (1981-06-01), Seachman
patent: 4336997 (1982-06-01), Ross et al.
patent: 4435079 (1984-03-01), Hennick
Johnathan Maxwell, "Monographs on Applied Optics #6-Catadioptric Imaging Systems", Adam Hilger, Ltd. (1972).

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