Image pickup optical system and image pickup apparatus using the same
AssigneeOlympus Corporation
InventorTakuya Ohtsu
Life of this patent
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Abstract
The image pickup optical system comprises: an aperture is placed on the most object side, the image pickup optical system comprises, in order from the object side: a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a positive refractive power; a fourth lens having a positive refractive power; and a fifth lens having a negative refractive power, and the following conditional expression is satisfied: −1.49<(r6+r7)/(r6−r7)<1.24 (1) where r6 is the paraxial radius of curvature of an object side surface of the third lens, and r7 is the paraxial radius of curvature of an image plane side surface of the third lens.
Claims13
An image pickup optical system wherein
- an aperture is placed on the most object side,
- the image pickup optical system comprises, in order from the object side:
- a first lens having a positive refractive power;
- a second lens having a negative refractive power;
- a third lens having a positive refractive power;
- a fourth lens having a positive refractive power;
- and
- a fifth lens having a negative refractive power, and
- the following conditional expression is satisfied:
- −1.49<(r6+r7)/(r6−r7)<1.24 (1)
- where
- r6 is a paraxial radius of curvature of an object side surface of the third lens, and
- r7 is a paraxial radius of curvature of an image plane side surface of the third lens.
Dependencies are inferred from the claim text.