DICHROIC CUT FILTER FOR IMAGING

摘要

An image device for wide-angle imaging may include an integrated optical system with a wide-angle dichroic cut filter. The dichroic cut filter may be an ultra-violet/infrared (UV/IR) cut filter to block UV and IR wavelengths of light and to transmit visible light. The dichroic cut filter is positioned adjacent to a surface of a lens in the optical system that receives rays of light at a substantially uniform angle of incidence along its surface. For example, the lens having the dichroic cut filter may receive all rays of light at an angle of incidence normal to the lens surface. The passband characteristics of the dichroic cut filter thus remain consistent for all rays of light. The dichroic cut filter may also be positioned near an aperture of the image device so as to direct retroreflected light away from the image sensor.