Variable focal length lens system and imaging apparatus

Details Variable focal length lens system and imaging apparatus Variable focal length lens system and imaging apparatus

2007-10-23

2007-10-23

Thompson, Timothy (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S687000, C359S686000, C359S772000

Reexamination Certificate

active

11783797

ABSTRACT:
A variable focal length lens system includes: a first lens group having a positive refractive power; a second lens group having a negative refractive power; a third lens group having a positive refractive power; and a fourth lens group having a positive refractive power. As the lens position state changes from a wide-angle end state to a telephoto end state, at least each of the lens groups is mobile, the second lens group moves towards the image side and the third lens group moves towards the object side such that the gap between the first and the second lens group increases, and the gap between the second and the third lens group decreases, while the fourth lens group moves in the direction of the optical axis so as to compensate for changes in the position of the image plane which accompany movements of each of the lens group.

REFERENCES:
patent: 7206137 (2007-04-01), Nakatani et al.
patent: 2003-295059 (2003-10-01), None
patent: 2005-128186 (2005-05-01), None
patent: 2005-215385 (2005-08-01), None

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