DICHROIC CUT-OFF FILTER FOR OBTAINING IMAGES Russian patent published in 2014 - IPC H04N5/225 G02B5/28 

FIELD: physics, optics.

SUBSTANCE: device for obtaining a wide-angle image comprises an optical system and a wide-angle dichroic cut-off filter situated near the surface of the lens in the optical system. The lens receives principal light rays essentially at the same angle of incidence on its surface. A device for reducing glare in the image former comprises an absorption ultraviolet (UV) cut-off filter and a dichroic infrared cut-off filter, situated on the lens in the optical system, which receives reflected light from the surface in the optical system at an angle of incidence which is greater than the angle of incidence of light from the object falling on the dichroic infrared cut-off filter. In another version, the device comprises an absorption infrared cut-off filter and a dichroic UV cut-off filter, situated on the lens in the optical system, which receives reflected light from the surface in the optical system, at an angle of incidence which is less than the angle of incidence of light from the imaged object, falling on the dichroic UV cut-off filter.

EFFECT: reducing transmission of undesirable wavelengths of optical radiation and/or glare in the image former.

23 cl, 20 dwg