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Patent Searching and Data


Title:
OPTICAL SYSTEM AND IMAGING APPARATUS HAVING THE SAME
Document Type and Number:
Japanese Patent JP2017191160
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To obtain an optical system in which high optical performance can be easily obtained in the whole screen range while the system is small in size as a whole and has a wide angle of view.SOLUTION: The optical system comprises, successively disposed from an object side to an image side, a front group having a negative refractive power, an aperture stop, and a rear group having a positive refractive power. The front group is composed of, successively disposed from the object side to the image side, a first lens having a negative refractive power and having a concave surface on the image side, a second lens having a negative refractive power and having a concave surface on the image side, and a third lens having a positive refractive power. The rear group is composed of, successively disposed from the object side to the image side, a fourth lens having a positive refractive power and a cemented lens having a positive lens and a negative lens cemented to each other. A distance DFG from the lens surface on the object side of the first lens to the lens surface on the image side of the third lens, a focal distance f3 of the third lens, and a focal distance f of the whole system are each appropriately set.SELECTED DRAWING: Figure 1

Inventors:
IKETANI MASAKI
Application Number:
JP2016079395A
Publication Date:
October 19, 2017
Filing Date:
April 12, 2016
Export Citation:
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Assignee:
CANON KK
International Classes:
G02B13/04; G02B13/18
Attorney, Agent or Firm:
高梨 幸雄