Image taking optical system and image pickup apparatus equipped with same
AssigneeOlympus Corporation
InventorSanae OHKI
Life of this patent
Estimating the term…
Abstract
An image taking optical system includes, in order from the object side, a stop, a first lens having a biconvex shape and having a positive refractive power, a second lens having a concave surface facing the image side and having a negative refractive power, a third lens having a convex surface facing the image side and having a positive refractive power, and a fourth lens having a negative refractive power. The image taking optical system satisfies the conditional expression “0.6<d5/(d5+d6)<0.8”, where d5 is the air distance between the second lens and the third lens on the optical axis, and d6 is the thickness of the third lens.
Claims13
An image taking optical system comprising, in order from the object side, a stop, a first lens having a biconvex shape and having a positive refractive power, a second lens having a concave surface facing the image side and having a negative refractive power, a third lens having a convex surface facing the image side and having a positive refractive power, and a fourth lens having a negative refractive power, wherein the image taking optical system satisfies the following conditional expression (1) :
- 0.6<d5/(d5+d6)<0.8 (1),
- where d5 is the air distance between the second lens and the third lens on the optical axis, and d6 is the thickness of the third lens.
Dependencies are inferred from the claim text.