Title:
OPTICAL FILTER, AND DEVICE USING SAID FILTER
Document Type and Number:
WIPO Patent Application WO/2014/192715
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 even in the vicinity of a lower end of a transmission wavelength range, and which exhibits excellent visible light transmittance and excellent infrared-beam cut-off properties. [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 (C): (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 transmittance of the filter measured from the orthogonal direction be not more than 20% for wavelengths in the range 800-1000 nm; and (C) that the absolute value of the difference between the value (Za) of the longest wavelength at which the transmittance of the filter measured from the orthogonal direction is 10% for wavelengths in the range 560-800 nm, and the value (Zb) of the longest wavelength at which the transmittance of the filter measured from an angle of 30˚ with respect to the orthogonal direction is 10% for wavelengths in the range 560-800 nm, be less than 25 nm.
Inventors:
NAGAYA KATSUYA (JP)
OOHASHI YUKIE (JP)
OOHASHI YUKIE (JP)
Application Number:
PCT/JP2014/063908
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:
| WO2013054864A1 | 2013-04-18 | |||
| WO2012169447A1 | 2012-12-13 |
Foreign References:
| JP2012008532A | 2012-01-12 |
Attorney, Agent or Firm:
SSINPAT PATENT FIRM (JP)
Patent business corporation SSINPAT (JP)
Patent business corporation SSINPAT (JP)
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