Patent ID: 9379157
Filing Date: 2016-06-28
CPC Classification: G06K,H01L

Claim Text:
1. An image acquisition device comprising: a light source which irradiates an object with light; and a band pass filter on a path on which the light from the object is input to light receiving elements, the band pass filter being configured by two mirror layers and a spacer layer, the spacer layer being pinched by the two mirror layers, each of the two mirror layers having a structure including amorphous silicon thin films and a thin film, the thin film being alternately laminated with an amorphous silicon thin film, each of the amorphous silicon thin films having an optical path length of approximately λ/4 in the peak wavelength (λ) of the light source, the thin film being formed of a material having a different refractivity from the amorphous silicon thin films, and the spacer layer being the amorphous silicon thin film which has an optical path length of approximately λ/2 in the peak wavelength (λ) of the light source, or a thin film which is formed of a material with a different refractivity from the amorphous silicon thin films.