Title:
PHOTOGRAPHIC LENS AND IMAGING APPARATUS USING THE SAME
Document Type and Number:
Japanese Patent JP2004361440
Kind Code:
A
Abstract:
To provide a compact high-performance photographic lens having sufficient back focus and short lens optical length.
The photographic lens has a 1st lens (L1) being a biconvex lens having positive power, both convex surfaces of which are aspherical, and a 2nd lens (L2) being a meniscus lens turning its concave surface to an object side and having negative power, both surfaces of which are aspherical. The 1st and the 2nd lenses are arranged in order from the object side, and the ratio of the back focus (bf) of the lens to the focal distance (f) of a lens entire system is regulated within 0.6 to 0.8.
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Inventors:
NIO JUNICHI
Application Number:
JP2003156080A
Publication Date:
December 24, 2004
Filing Date:
May 30, 2003
Export Citation:
Assignee:
SEIKO PRECISION KK
International Classes:
G02B13/00; G02B13/18; (IPC1-7): G02B13/00; G02B13/18
Attorney, Agent or Firm:
Shuhei Katayama