Title:
PHOTOGRAPHIC OPTICAL SYSTEM
Document Type and Number:
Japanese Patent JP3781394
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a photographing optical system capable of improving chromatic aberration and obtaining high image quality, reduced in the number of composing lenses, small in size, light in weight, and low in cost.
SOLUTION: This photographing optical system has a negative lens arranged closest to an image side, and a positive lens, a negative lens, and a positive lens in order from a subject side which are arranged on the subject side from the negative lens arranged closest to the image side; and the negative lens arranged closest to the image side satisfies next conditional expressions. 75.0≥νa, 0.8≤SG≤2.2. Provided that νa and SG are the Abbe number and lens specific gravity (g/cm3) of the negative lens arranged on the side closest to the image respectively.
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Inventors:
Seiji Shimizu
Application Number:
JP33160397A
Publication Date:
May 31, 2006
Filing Date:
December 02, 1997
Export Citation:
Assignee:
Olympus Endo Technology America Inc.
International Classes:
G02B9/34; G02B13/00; G02B15/16; G02B15/177; (IPC1-7): G02B15/16; G02B9/34
Domestic Patent References:
| JP495912A | ||||
| JP5173069A |
Attorney, Agent or Firm:
Hiroshi Nagisawa
Ryukichi Abe
Hirukawa Masanobu
Norihiko Uchida
Hideo Sugai
Kenji Aoki
Akira Yonezawa
Ryukichi Abe
Hirukawa Masanobu
Norihiko Uchida
Hideo Sugai
Kenji Aoki
Akira Yonezawa