Title:
結像光学系及びそれを用いた電子機器
Document Type and Number:
Japanese Patent JP4623993
Kind Code:
B2
Abstract:
An imaging optical system includes, in order from an object side, a first lens having positive refracting power, a concave surface of which is directed toward the object side, a third lens having positive refracting power, a convex surface of which is directed toward an image side and a fourth lens having negative refracting power, wherein the second lens and the third lens are cemented together. Having such a configuration, an angle made by the incident light and the exiting light to the cemented lens can be kept small, and accordingly, the generation of aberrations at the refracting surface and performance change of lenses when these are in a relative decentering position can be suppressed.
Inventors:
Takahiro Tennai
Application Number:
JP2004111986A
Publication Date:
February 02, 2011
Filing Date:
April 06, 2004
Export Citation:
Assignee:
Olympus Endo Technology America Inc.
International Classes:
G02B13/18; G02B9/34; G02B13/00; G02B15/14
Domestic Patent References:
| JP4095912A | ||||
| JP2002365530A | ||||
| JP2001281539A | ||||
| JP9281388A | ||||
| JP2003241081A |
Attorney, Agent or Firm:
Yasushi Shinohara
Masayuki Fujinaka
Masayuki Fujinaka