Variable focal distance lens system and imaging device

Details Variable focal distance lens system and imaging device Variable focal distance lens system and imaging device

2011-04-05

2011-04-05

Choi, William C (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

07920333

ABSTRACT:
A variable focal distance lens system includes a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, and a fourth lens group having positive refractive power, which are sequentially disposed from an object side to an image side. The system satisfies −0.65<(R33−R34)/(R33+R34)<−0.25 and −1.0<(R22−R23)/(R22+R23)<−0.6, wherein R33 represents the radius of curvature of the most image-side surface of a cemented lens of the third lens group, R34 represents the radius of curvature of the object-side surface of a positive lens of the third lens group disposed on the most image side, R22 represents the radius of curvature of the image-side surface of a negative lens of the second lens group disposed on the most object side, and R23 represents the radius of curvature of the most object-side surface of a cemented lens of the second lens group.

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