Title:
OPTICAL FILTER, AND DEVICE USING SAID FILTER
Document Type and Number:
WIPO Patent Application WO/2014/192714
Kind Code:
A1
Abstract:
[Problem] To provide an optical filter with which improvements are made with respect to problems of conventional optical filters such as near infrared cut-off filters, which has a broad angular field of view and a high visible light transmittance, and which exhibits excellent ray cut-off properties even with respect to a relatively long wavelength range, namely wavelengths in the range 1100-1200 nm. [Solution] Provided is an optical filter provided with: a transparent resin substrate including a near-infrared absorption pigment; and a near-infrared reflective film formed upon at least one surface of the substrate. The optical filter satisfies conditions (A) to (D): (A) that the average transmittance of the filter measured from an orthogonal direction be at least 75% for wavelengths in the range 430-580 nm; (B) that the average reflectance of the filter measured from at least one surface thereof when measured from an angle of 5˚ with respect to the orthogonal direction be at least 80% for wavelengths in the range 800-1000 nm; (C) that the average reflectance of the filter measured from at least one surface thereof when measured from an angle of 5˚ with respect to the orthogonal direction be at least 70% for wavelengths in the range 1100-1200 nm; and (D) that the absolute value of the difference between the value (Xa) of the longest wavelength at which the transmittance of the filter measured from the orthogonal direction is 50% for wavelengths in the range 560-800 nm, and the value (Xb) of the longest wavelength at which the transmittance of the filter measured from an angle of 30˚ with respect to the orthogonal direction is 50% for wavelengths in the range 560-800 nm, be less than 15 nm.
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Inventors:
NAGAYA KATSUYA (JP)
ASANO TAKAYUKI (JP)
TSUBOUCHI TAKASHI (JP)
OTSUKI TOSHIHIRO (JP)
ASANO TAKAYUKI (JP)
TSUBOUCHI TAKASHI (JP)
OTSUKI TOSHIHIRO (JP)
Application Number:
PCT/JP2014/063907
Publication Date:
December 04, 2014
Filing Date:
May 27, 2014
Export Citation:
Assignee:
JSR CORP (JP)
International Classes:
B32B7/023; G02B5/22; C08L101/00; G02B5/26; G02B5/28; G03B7/18; G03B11/00
Domestic Patent References:
| WO2012169447A1 | 2012-12-13 | |||
| WO2013054864A1 | 2013-04-18 |
Foreign References:
| JP2012008532A | 2012-01-12 | |||
| JP2011133532A | 2011-07-07 |
Attorney, Agent or Firm:
SSINPAT PATENT FIRM (JP)
Patent business corporation SSINPAT (JP)
Patent business corporation SSINPAT (JP)
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