Title:
PHOTOGRAPHIC LENS
Document Type and Number:
Japanese Patent JP3239520
Kind Code:
B2
Abstract:
PURPOSE: To provide a photographic lens which is excellently assembled in the main body part of a film unit or a camera and small in spherical aberration and has high performance from the periphery to the center in spite of an asymmetrical lens by employing two-lens constitution for the improvement of picture quality and arranging a stop on an image field side.
CONSTITUTION: A 1st lens L1 and a 2nd lens L2 are arranged from the object side and the stop D is arranged more on the image field side than the 2nd lens L2 to constitute what is called a back-end type, and, the 1st lens L1 is a positive meniscus lens and arranged having its convex surface facing the object side and the 2nd lens L2 is a positive meniscus lens having its convex surface facing the image field side by using a biconvex lens as the 2nd lens L2 or forming the 1st lens L1 of a biconvex lens. Further, an image formation plane 9 is curved so that its object side is concave.
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Inventors:
Kazunori Ohno
Application Number:
JP6917693A
Publication Date:
December 17, 2001
Filing Date:
March 05, 1993
Export Citation:
Assignee:
Fuji Photo Optical Co., Ltd.
International Classes:
G02B13/18; G02B9/06; (IPC1-7): G02B13/18
Domestic Patent References:
| JP1245212A | ||||
| JP3242608A | ||||
| JP5281468A | ||||
| JP4211215A | ||||
| JP667089A |
Attorney, Agent or Firm:
Shunji Kagei