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US 2008/0074760 A1Published application
Imaging lens
AssigneeFujinon Corporation
InventorKenichi SATO
Life of this patent
Estimating the term…
Abstract
A single focus imaging lens comprises: a front lens group including one or two lenses and having a positive refractive power as a whole; a rear lens group including two or three lenses and having a negative refractive power as a whole; and a focusing lens, disposed between the front lens group and the rear lens group, that has a positive refractive power and moves on an optical axis for adjusting focus, wherein the following conditional expression is satisfied: 1.0<FL/f<5.0 (X) where f: focal length of the single focus imaging lens; FL: focal length of the focusing lens.
Claims5
A single focus imaging lens comprising:
- a front lens group including one or two lenses and having a positive refractive power as a whole;
- a rear lens group including two or three lenses and having a negative refractive power as a whole;
- and
- a focusing lens, disposed between the front lens group and the rear lens group, that has a positive refractive power and moves on an optical axis for adjusting focus,
- wherein the following conditional expression is satisfied:
- 1.0<FL/f<5.0 (X)
- where
- f:
- focal length of the single focus imaging lens;
- FL:
- focal length of the focusing lens.
8 more elements
Dependencies are inferred from the claim text.