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Patent Searching and Data


Title:
LENS WITH IR CUT FILTER, METHOD FOR MANUFACTURING SAME AND SMALL CAMERA
Document Type and Number:
WIPO Patent Application WO/2004/029676
Kind Code:
A1
Abstract:
A glass plano-convex lens (2a, 2c) in which one refractive surface is a flat face (21) and the other refractive surface is a convex face (22) is provided with an IR blocking dielectric multilayer film (3) for blocking infrared rays on one of the faces. A lens forming body (26) for multi-production is made of glass by integrally providing a surface of a flat plate (25) with convex portions (24) for convex lenses. After forming an IR blocking dielectric multilayer film (3) on one face of the lens forming body (26), the convex portions (24) are separated from each other by cutting portions of the flat plate (25) of the lens forming body (26). The thus-obtained lens (1c) with an IR cut filter is used as a condenser for a small camera. This lens with an IR cut filter enables reduction of the cost which has been a problem caused when a lens with an IR cut filter used as a condenser for a candid camera or the like is made of glass. A method for manufacturing the lens with IR cut filter and a candid camera are also disclosed.

Inventors:
Shimizu, Toshihiko c/o SEIKO EPSON CORPORATION (3-5 Owa 3-Chom, Suwa-Shi Nagano, 392-8502, JP)
Onishi, Ichiro c/o SEIKO EPSON CORPORATION (3-5 Owa 3-Chom, Suwa-Shi Nagano, 392-8502, JP)
Komatsu, Akira c/o SEIKO EPSON CORPORATION (3-5 Owa 3-Chom, Suwa-Shi Nagano, 392-8502, JP)
Kojima, Hiroshi c/o SEIKO EPSON CORPORATION (3-5 Owa 3-Chom, Suwa-Shi Nagano, 392-8502, JP)
Application Number:
PCT/JP2003/012110
Publication Date:
April 08, 2004
Filing Date:
September 22, 2003
Export Citation:
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Assignee:
SEIKO EPSON CORPORATION (4-1 Nishi-Shinjuku 2-Chome, Shinjuku-Ku, Tokyo, 163-0811, JP)
International Classes:
G02B5/26; G02B3/00; G02B5/28; G02B9/02; G02B13/00; G02B13/18; G03B11/00; (IPC1-7): G02B3/00; G03B11/00
Foreign References:
JP2000131521A
JP2002040234A
JPH11295576A
JPH1010394A
JP2000037787A
Other References:
See also references of EP 1536250A1
Attorney, Agent or Firm:
Kamiyanagi, Masataka c/o Intellectual, Property Division (SEIKO EPSON CORPORATION 3-5, Owa 3-Chom, Suwa-Shi Nagano, 392-8502, JP)
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