Title:
単焦点レンズ
Document Type and Number:
Japanese Patent JP4932105
Kind Code:
B2
Abstract:
A single focus lens is disclosed that is formed of only four lens elements. In order from the object side, these are: a first lens element of positive refractive power and having either a concave surface or planar surface on the object side; a second lens element of weak refractive power and meniscus shape that is made of plastic with at least one surface aspheric; a third lens element which has positive refractive power and a convex surface on the image side; and a fourth lens element of weak refractive power and meniscus shape that is made of plastic with at least one surface aspheric and with its concave surface on the image side. Preferably, various conditions are satisfied in order that the single focus lens be compact and favorably correct aberrations so as to provide a high quality image.
Inventors:
Kenichi Sato
Application Number:
JP2001293223A
Publication Date:
May 16, 2012
Filing Date:
September 26, 2001
Export Citation:
Assignee:
FUJIFILM Corporation
International Classes:
G02B13/00; G02B9/34; G02B11/12; G02B13/18
Domestic Patent References:
| JP3288811A |
Attorney, Agent or Firm:
Yanagita Seiji
Go Sakuma
Go Sakuma