Title:
INFRARED BLOCKING FILTER
Document Type and Number:
WIPO Patent Application WO/2011/158635
Kind Code:
A1
Abstract:
Disclosed is an infrared blocking filter which is capable of blocking light having a wavelength more than 700 nm, while sufficiently transmitting red visible light having a wavelength of 600-700 nm and suppressing occurrence of ghosting. Specifically disclosed is an infrared blocking filter (1) which is configured of an infrared absorber (2) and an infrared reflector (3). The infrared absorber (2) has such light transmission characteristics that the transmittance at wavelengths within the wavelength range of 620-670 nm is 50%, and the infrared reflector (3) has such light transmission characteristics that the transmittance at wavelengths within the wavelength range of 670-690 nm is 50%. The wavelengths at which the infrared reflector (3) has a transmittance of 50% are longer than the wavelengths at which the infrared absorber (2) has a transmittance of 50%. By combining the infrared absorber (2) and the infrared reflector (3), the infrared blocking filter (1) has such light transmission characteristics that the transmittance at wavelengths within the wavelength range of 620-670 nm is 50% and the transmittance at a wavelength of 700 nm is less than 5%.
Inventors:
SAITOH, Hideshi (1389 Aza-Kono, Shinzaike, Hiraoka-cho, Kakogawa-sh, Hyogo 94, 〒6750194, JP)
齊藤 秀史 (〒94 兵庫県加古川市平岡町新在家字鴻野１３８９番地株式会社大真空内 Hyogo, 〒6750194, JP)
齊藤 秀史 (〒94 兵庫県加古川市平岡町新在家字鴻野１３８９番地株式会社大真空内 Hyogo, 〒6750194, JP)
Application Number:
JP2011/062225
Publication Date:
December 22, 2011
Filing Date:
May 27, 2011
Export Citation:
Assignee:
DAISHINKU CORPORAITON (1389, Aza-Kono Shinzaike, Hiraoka-cho, Kakogawa-sh, Hyogo 94, 〒6750194, JP)
株式会社大真空 (〒94 兵庫県加古川市平岡町新在家字鴻野１３８９番地 Hyogo, 〒6750194, JP)
SAITOH, Hideshi (1389 Aza-Kono, Shinzaike, Hiraoka-cho, Kakogawa-sh, Hyogo 94, 〒6750194, JP)
株式会社大真空 (〒94 兵庫県加古川市平岡町新在家字鴻野１３８９番地 Hyogo, 〒6750194, JP)
SAITOH, Hideshi (1389 Aza-Kono, Shinzaike, Hiraoka-cho, Kakogawa-sh, Hyogo 94, 〒6750194, JP)
International Classes:
G02B5/20; B32B7/02; G02B5/22; G02B5/28
Attorney, Agent or Firm:
ARC PATENT ATTORNEYS' OFFICE (Sumitomoseimei Midosuji Bldg, 14-3 Nishitemma 4-chome, Kita-ku, Osaka-sh, Osaka 47, 〒5300047, JP)
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Claims:
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