Auto-focusing system for cameras with in interchangeable objecti

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G03B 1336

Patent

active

052490122

ABSTRACT:
An auto-focusing system includes a focus condition detector which detects focus condition based on the infrared light. A data producer is provided for producing a deflection signal indicating a difference between an image forming distance for the infrared light and that for the visible light, due to aberration. In accordance with the detected focus condition and deflection signal, an objective lens is shifted to a position for properly focusing an image of visible light on an image forming plane.

REFERENCES:
patent: 4509842 (1985-04-01), Taniguchi et al.
patent: 4602861 (1986-07-01), Taniguchi et al.

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