IMAGING LENS AND IMAGING DEVICE USING THE LENS

WIPO Patent Application WO/2010/026689

A1

Provided is an imaging lens having a three lens structure which can be more compact (smaller, thinner), reduce costs, and be applied to a high-resolution imaging element of at least megapixel order mounted in a small mobile product such as a portable telephone. An imaging lens (6) comprises an aperture diaphragm (4), a first lens (1) which has positive refractive power and is formed with a diffraction optical element in the lens surface on the image side, a second lens (2) which has positive refractive power and is composed of a meniscus lens having a convex lens surface on the image side, and a third lens (3) which has negative refractive power, these parts being positioned in order from the subject side toward the image surface side. If the focal length of the entire optical system is f, the focal length of the first lens (1) is f1, the focal length of the second lens (2) is f2, the focal length of the third lens (3) is f3, and the refractive power of the diffraction optical element is φDOE, then the following conditions (1) to (4) are satisfied. 0.9 < f1/f < 1.3   (1) 0.7 < f2/f < 1.1   (2) -0.8 < f3/f < -0.6 (3) -0.3 < f⋅φDOE < 0.5 (4)

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IBA, Takumi (())
井場拓巳 (())

JP2009/003050

March 11, 2010

July 01, 2009

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PANASONIC CORPORATION (1006, Oaza Kadoma Kadoma-sh, Osaka 01, 〒5718501, JP)
パナソニック株式会社 (〒01 大阪府門真市大字門真１００６番地 Osaka, 〒5718501, JP)
IBA, Takumi (())

G02B13/00

IKEUCHI SATO & PARTNER PATENT ATTORNEYS (26th Floor, OAP TOWER 8-30, Tenmabashi 1-chome, Kita-ku, Osaka-sh, Osaka 26, 〒5306026, JP)

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