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Title:
OPTICAL ELEMENT, OPTICAL SYSTEM, AND IMAGE PICKUP DEVICE
Document Type and Number:
WIPO Patent Application WO/2014/115689
Kind Code:
A1
Abstract:
An optical elements, wherein the transmissivity of visible light is reduced from a center portion towards a peripheral portion. Provided is an optical element having the following: a visible light absorbing section that is formed from a material which absorbs some or all of visible light, and the thickness of the visible light absorbing section increases from a center portion towards a peripheral portion; and a visible light transmitting section that is stacked on the visible light absorbing section and is formed from a material which transmits visible light. The abovementioned problem is solved by providing the optical element which is characterized in that in a case where the transmissivity of light having a wavelength of 420nm is T420, the transmissivity of light having a wavelength of 360nm is T360, and the average transmissivity of light having a wavelength from 400nm to 700nm is Tave, T420/T360≥3 in a region where Tave≥50%.

Inventors:
ISHIDO, So (Koriyama Seibu Dai-2 Kogyo Danchi, 1-8, Machiikedai, Koriyama-sh, Fukushima 15, 〒9630215, JP)
NAGAYAMA, Hiromichi (Koriyama Seibu Dai-2 Kogyo Danchi, 1-8, Machiikedai, Koriyama-sh, Fukushima 15, 〒9630215, JP)
SHIOYA, Kenichi (Koriyama Seibu Dai-2 Kogyo Danchi, 1-8, Machiikedai, Koriyama-sh, Fukushima 15, 〒9630215, JP)
HOTAKA, Hiroki (Koriyama Seibu Dai-2 Kogyo Danchi, 1-8, Machiikedai, Koriyama-sh, Fukushima 15, 〒9630215, JP)
Application Number:
JP2014/051012
Publication Date:
July 31, 2014
Filing Date:
January 20, 2014
Export Citation:
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Assignee:
ASAHI GLASS COMPANY, LIMITED (5-1 Marunouchi 1-chome, Chiyoda-ku Tokyo, 05, 〒1008405, JP)
International Classes:
G02B5/00; G02B5/22; G03B11/00
Foreign References:
JP2004536341A2004-12-02
JP2007219210A2007-08-30
JP2005266096A2005-09-29
JP2009521722A2009-06-04
JP2013254154A2013-12-19
Attorney, Agent or Firm:
ITOH, Tadashige et al. (16th Floor, Marunouchi MY PLAZA 1-1, Marunouchi 2-chome, Chiyoda-k, Tokyo 05, 〒1000005, JP)
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