Title:
光学系及びそれを有する光学機器
Document Type and Number:
Japanese Patent JP5388446
Kind Code:
B2
Abstract:
An optical system in which a maximum value of a height from an optical axis of a paraxial marginal ray closer to an expanded side than a point of intersection between an optical axis and a paraxial chief ray, includes a lens unit Lr including at least one refractive optical element Gn of a negative refractive power. In the optical system, nud (Gn) as an Abbe number of a material of the refractive optical element Gn, thetagF (Gn) as a partial dispersion ratio regarding g and F-lines, FGn as a focal lengths of the refractive optical element Gn, and Fr as focal lengths of the lens unit Lr are set appropriately.
Inventors:
Takayama Yokoyama
Application Number:
JP2007314595A
Publication Date:
January 15, 2014
Filing Date:
December 05, 2007
Export Citation:
Assignee:
Canon Inc
International Classes:
G02B13/00; G02B1/00; G02B1/04; G02B13/02; G02B13/18; G02B15/22
Domestic Patent References:
| JP2007065590A | ||||
| JP2007279184A | ||||
| JP2004333770A | ||||
| JP2005181392A | ||||
| JP2009042700A | ||||
| JP2009115874A | ||||
| JP2009092836A | ||||
| JP2009042377A | ||||
| JP2008257179A | ||||
| JP2008122874A | ||||
| JP2009031757A |
Attorney, Agent or Firm:
Yukio Takanashi