Focus adjustable optical system

Details Focus adjustable optical system Focus adjustable optical system

2007-04-24

2008-10-21

Thompson, Timothy J (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S772000, C359S773000

Reexamination Certificate

active

07440198

ABSTRACT:
A focus adjustable optical system includes a first lens unit and a second lens unit arranged on an optical axis in direction from the object side to the image side. The two opposite surfaces of each of the lenses of the first lens unit and second lens unit are non-spherical surfaces. Each lens of the first lens unit defines with the image side a fixed distance. The second lens unit has one lens movable by a low-power small-sized driving source along the optical axis to adjust its distance relative to the image side and to further adjust the focal distance while the distance between the first lens unit and the image plane remains unchanged.

REFERENCES:
patent: 7072119 (2006-07-01), Kawasaki
patent: 7079327 (2006-07-01), Takatsuki
patent: 7218457 (2007-05-01), Sensui

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