Focus detecting device

Details Focus detecting device Focus detecting device

1984-06-01

1985-06-18

Perkey, William B.

G03B 708

Patent

active

045238286

ABSTRACT:
A focus detecting device of the type in which infrared light is projected onto an object, and the reflected light from the object is detected through an objective lens. Focusing conditions of the objective lens are distinquished from each other. The infrared light includes rays of different wavelength with which respective object images are formed by the objective lens and are evaluated by the degree of sharpness. By computing the degrees of sharpness of these infrared images based on an important formula, the focusing condition of the objective lens is determined with respect to visible light. This assures accurate focusing adjustment as the objective lens is interchanged.

REFERENCES:
patent: 3443502 (1969-05-01), Harvey
patent: 4065778 (1977-12-01), Harvey
patent: 4357085 (1982-11-01), Niwa et al.

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