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Title:
OPTICAL FILTER, IR SENSOR, AND LIGHT-EMITTING DEVICE
Document Type and Number:
WIPO Patent Application WO/2022/176769
Kind Code:
A1
Abstract:
In the present invention, an optical filter (1) is provided with a matrix (10) constituted from an inorganic substance in which the solubility in water is 0.4 g/100 g-H2O or below, and a wavelength-selective absorption material (20) distributed in the matrix (10). The optical filter (1) absorbs a light component having wavelengths in a band in a target wavelength band of 0.8 μm to 20 μm. The temperature at which the mass decrease ratio of the wavelength-selective absorption material (20) when heated at a speed of 10 °C/minute from 100°C in air is 10 mass% is 900°C or below. The apparent density of the optical filter (1) with respect to the true density of the matrix (10) is 80% or above. In the target wavelength band, the wavelength band width at which the linear transmittance of the optical filter (1) per 1 mm thickness is 30% or above is 50 nm or above.

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Inventors:
YOSHIOKA TATSURO
SATO NATSUKI
KURIZOE NAOKI
SAWA RYOSUKE
Application Number:
PCT/JP2022/005316
Publication Date:
August 25, 2022
Filing Date:
February 10, 2022
Export Citation:
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Assignee:
PANASONIC IP MAN CO LTD (JP)
International Classes:
G01J1/02; G02B5/22
Domestic Patent References:
WO2020195183A12020-10-01
Foreign References:
JP2004240289A2004-08-26
JPS6373203A1988-04-02
JP2015196622A2015-11-09
JPS6373203A1988-04-02
JP2021025009A2021-02-22
Attorney, Agent or Firm:
ITO Masakazu et al. (JP)
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