Agc Inc.

Optical Coatings Japan

Naoto Tatsuoka

Atsushi Koyanagi

Yasuyuki Takimoto

Takahiro Mashimo

Kazuya Takemoto

Hideaki Takahoshi

Masaaki Miyake

Yosuke Sugihara

An optical filter includes a substrate and a dielectric multilayer film laid as an outermost layer on at least one major surface of the substrate. The dielectric multilayer film includes a low-refractive index film and a high-refractive index film provided alternately. At least one film selected from the group consisting of the low-refractive index film and the high-refractive index film satisfies the following optical characteristics (i-1) and (i-2A): (i-1) an extinction coefficient kat a wavelength of 600 nm is 0.12 or larger; and (i-2A) a minimum extinction coefficient kin a wavelength range of 1530 to 1570 nm is 0.01 or smaller; and the optical filter satisfies the following optical characteristic (ii-1A): (ii-1A) light in a wavelength range of 400 to 680 nm is blocked and light in the wavelength range of 1530 to 1570 nm is transmitted.

Optical filter

A sensor cover, provided in an opening of a housing that houses a sensor, includes a conductor; a dielectric multilayer film; and a heating film, in a desired order from an outside of the housing toward an inside of the housing. The conductor and the heating film are insulated from each other. A shortest distance between the conductor and the heating film is 2.0 μm or more.

Sensor cover and sensor module

Growing community of inventors

Tokyo, Japan

Naoto Tatsuoka