IMAGING LENS, CAMERA DEVICE, AND SENSING DEVICE

Japanese Patent JP2017156570

A

PROBLEM TO BE SOLVED: To provide a compact imaging lens that has a wide view angle, a small F-number, and high performance.SOLUTION: The imaging lens comprises, in order from the object side, a first lens L1 having negative refractive power, a second lens L2 having negative refractive power, a third lens L3 having positive refractive power, an aperture stop S, a fourth lens L4 having positive refractive power, a fifth lens L5 having negative refractive power, and a sixth lens L6 having positive refractive power. The first lens L1 has object-side and image-side surfaces that are both concave. The second lens L2 has a concave surface on the object side, and is configured in such a way that a curvature radius of the object-side surface is greater than that of an image-side surface in absolute terms. The third lens L3 has a convex surface on the image side, and is configured in such a way that an absolute value of a curvature radius of the image-side surface is greater than that of an object-side surface. The image-side surface of the second lens L2 and the object-side surface of the third lens L3 are cemented together.SELECTED DRAWING: Figure 1

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OHASHI KAZUYASU

JP2016040192A

September 07, 2017

March 02, 2016

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RICOH CO LTD

G02B13/00

JP5750618B2	2015-07-22
JP2012093730A	2012-05-17
JP2004348082A	2004-12-09
JP2010276923A	2010-12-09
JP2004054013A	2004-02-19
JPH1020189A	1998-01-23
JP2014134563A	2014-07-24

WO2012127826A1	2012-09-27
US20120056976A1	2012-03-08

Tamio Nishiwaki

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