Title:
IMAGE PICKUP LENS
Document Type and Number:
Japanese Patent JP3908700
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To realize an image pickup lens whose constitution is simple and whose optical performance is excellent.
SOLUTION: The image pickup lens is constituted of a doublet obtained by bonding a concave-plane homogeneous lens and a radial type GRIN lens whose both surfaces are plane and having positive refractive power, and a brightness diaphragm to restrict luminous flux is arranged near the surface of the doublet on an object side. By satisfying a condition (-1<&phiv sh1/&phiv <0), a condition (-2<d×&phiv <0.5) and a condition (-0.015<1/V1<0.015), the lens system whose constitution is simple and whose optical performance is excellent is realized.
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Inventors:
Hirofumi Makita
Application Number:
JP2003200368A
Publication Date:
April 25, 2007
Filing Date:
July 23, 2003
Export Citation:
Assignee:
Olympus Endo Technology America Inc.
International Classes:
G02B13/04; (IPC1-7): G02B13/04
Domestic Patent References:
| JP1155016U |
Attorney, Agent or Firm:
Kanji Mukai
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