Zoom lens and image pickup apparatus

Details Zoom lens and image pickup apparatus Zoom lens and image pickup apparatus

2008-04-22

2008-04-22

Tieu, Benny Q. (Department: 4177)

Optical: systems and elements

Lens

With variable magnification

C359S642000, C359S676000, C359S683000, C359S686000, C396S072000, C396S079000

Reexamination Certificate

active

07362510

ABSTRACT:
A zoom lens with a reduced overall length having a color separating prism therein and a telecentric property with a first lens group (GI) having a positive refractive power and having a fixed position, a second lens group (GII) of the variable magnification type having a negative refractive power and having a position movable for magnification variation, a third lens group (GIII) having a positive refractive power and having a fixed position and a fourth lens group (GIV) having a positive refractive power and having a position variable for adjustment of a focal position upon magnification variation and upon focusing are disposed in order from an object side. At least one face of the two convex lenses in the fourth lens group is formed from an aspheric face.

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Form PCT/IB/338; International Application No.: PCT/JP/2005/003698 dated Apr. 20, 2004.

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