Patent ID: 8861088
Filing Date: 2014-10-14
Classification: G02B

Abstract:
1. An optical filter for providing in an imaging device, comprising: a transparent substrate; and a filter group formed on the transparent substrate and having transmission characteristics consisting of two wavelength bands in a visible region and in an infrared region, wherein a width of the wavelength bands at 50% transmission is between approximately 65 nm to approximately 200 nm, and the wavelength band in the infrared region is between approximately 800 nm to approximately 1000 nm, wherein the two wavelength bands are separated by a blocking characteristics band, wherein the filter group is constituted by combining a first filter having a continuous transmission band in the visible region and one preset band of the infrared region, and a plurality of filters each having transmission characteristics in the visible region and another preset band of the infrared region and each having a blocking wavelength band between the visible region and the another preset band of the infrared region, and wherein, in the plurality of filters, each of the blocking wavelength bands has a bandwidth of approximately 150 nm or less, and the blocking characteristics band is obtained by an overlap of the blocking wavelength bands of each of the plurality of filters.