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Patent Searching and Data

Document Type and Number:
WIPO Patent Application WO/2008/072410
Kind Code:
An imaging lens (6) is provided with, sequentially from the side where light enters from an object, an aperture diaphragm (1), a first lens (2) of meniscus shape having a positive refractive index and directing the convex surface toward the light entering side of light, and a second lens (3) of nonspherical shape having a positive or negative refractive index and directing the convex surface toward the incident side of light. The imaging lens is arranged, within the range of 70% of image height around the optical axis, such that the incident angle θin and the exit angle θout of a main light beam passing through the second lens (3) satisfy a relation of |θout-θin|<5 (degrees). With such an arrangement, an imaging lens (6) having a small overall length of lens and capable of correcting astigmatism is provided.

IMAOKA, Takuya (())
今岡 卓也 (())
Application Number:
Publication Date:
June 19, 2008
Filing Date:
October 02, 2007
Export Citation:
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MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. (1006, Oaza Kadoma Kadoma-shi Osaka, 01, 5718501, JP)
松下電器産業株式会社 (〒01 大阪府門真市大字門真1006番地 Osaka, 5718501, JP)
IMAOKA, Takuya (())
International Classes:
G02B13/00; G02B13/18
Attorney, Agent or Firm:
OHNO, Seiji et al. (OHNO & PARTNERS, Kasumigaseki Building 36F2-5, Kasumigaseki 3-chom, Chiyoda-ku Tokyo 36, 1006036, JP)
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