Focusing apparatus for adjusting focus of an optical instrument

Details Focusing apparatus for adjusting focus of an optical instrument Focusing apparatus for adjusting focus of an optical instrument

2005-03-08

2005-03-08

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

Reexamination Certificate

active

06864474

ABSTRACT:
A focusing apparatus adjusting the focus of an optical apparatus includes an optical unit for forming a subject image, a contrast detecting unit for detecting contrast value of subject image acquired by the optical unit, a distance measuring unit for computing distance information indicating a distance to the subject, an adjustment command receiving unit for receiving command information indicating a request to adjust a focus of the optical unit, a focus control unit for performing contrast detection by hill-climbing method when the adjustment command receiving unit receives the command information, a difference information computing unit for computing difference information indicating a difference between a focusing position detected by the focus control unit, which performs the contrast detection by hill-climbing method, and an adjustment position of the optical unit corresponding to the distance information computed by the distance measuring unit, and a difference information storing unit for storing the difference information computed by the difference information computing unit, wherein the focus control unit determines a condition of the contrast detection by hill-climbing method on the basis of the difference information stored in the difference information storing unit and distance information.

REFERENCES:
patent: 6473228 (2002-10-01), Toshimitsu
patent: 10-293245 (1998-11-01), None

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