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Patent Searching and Data


Title:
OPTICAL FILTER AND IMAGING DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/049884
Kind Code:
A1
Abstract:
Provided is an optical filter that has excellent near-infrared light shielding properties, and, in order to suppress, in a wide wavelength range, the incident angle dependence for light incident at a high angle, has a high transmittance of visible light, including blue light, and excellent light resistance as the degree of freedom of a reflective layer design increases. Also provided is an imaging device that uses said optical filter and has excellent color reproducibility. This optical filter comprises: a first near-infrared absorbing dye (D1) and a second near-infrared absorbing dye (D2) that are a squarylium compound of 1 to 3; an absorption layer that contains a transparent resin; and a reflective layer. 1. The dye (D1) has a maximum absorption wavelength λmax (D1) of 680 to 730 nm, and when the transmittance of λ max (D1) is density adjusted to 10%, the difference between λmax (D1) and a wavelength that exhibits a transmittance of 80% on a side having a shorter wavelength than λ max (D1) is no more than 100 nm. 2. The dye (D2) has a maximum absorption wavelength λmax (D2) of 720 to 770 nm. 3. The value obtained by subtracting λ max (D1) from λ max (D2) is between 30 nm and 85 nm, inclusive.

Inventors:
SHIONO Kazuhiko (8, Machiikedai 1-chome, Koriyama-sh, Fukushima 15, 〒9630215, JP)
NISHIMOTO Nanako (8, Machiikedai 1-chome, Koriyama-sh, Fukushima 15, 〒9630215, JP)
HIGASHITAMORI Sayuri (8, Machiikedai 1-chome, Koriyama-sh, Fukushima 15, 〒9630215, JP)
HOTAKA Hiroki (8, Machiikedai 1-chome, Koriyama-sh, Fukushima 15, 〒9630215, JP)
OKADA Satoshi (5-1 Marunouchi 1-chome, Chiyoda-k, Tokyo 05, 〒1008405, JP)
MATSUURA Keigo (5-1 Marunouchi 1-chome, Chiyoda-k, Tokyo 05, 〒1008405, JP)
Application Number:
JP2018/032845
Publication Date:
March 14, 2019
Filing Date:
September 05, 2018
Export Citation:
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Assignee:
AGC INC. (5-1 Marunouchi 1-chome, Chiyoda-ku Tokyo, 05, 〒1008405, JP)
International Classes:
G02B5/22; C09K3/00; G02B5/26; C09B23/00
Domestic Patent References:
WO2017051867A12017-03-30
WO2016181987A12016-11-17
WO2017135359A12017-08-10
Foreign References:
CN107533171A2018-01-02
JP2016142891A2016-08-08
JP2016200771A2016-12-01
JP2008308602A2008-12-25
Attorney, Agent or Firm:
SAKURA PATENT OFFICE, P.C. (Yoshizawa Bldg, 18-14 Uchikanda 1-chome, Chiyoda-k, Tokyo 47, 〒1010047, JP)
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