Patent ID: 7619202

Claim:
A remote-controllable electronic device, comprising: a casing with a hole; a filter having a U-shape cross-section with an inner edge and an outer edge, a flat surface area of said outer edge of said filter being substantially the same size of and being embedded to said hole of said casing, wherein said flat surface area of said outer edge of said filter is substantially coplanar with an outer surface of said casing; a sensor disposed within said casing and configured to receive a light signal filtered by said filter; and a shielding element disposed on said inner edge of said filter by at least portion of the outer rim of said shielding element wedged with said inner edge of said filter and disposed in front of said sensor so as to specify a receiving range for said light signal received by said sensor in a specific direction; wherein an open angle is defined as the maximum angle of said light signal filtered by said filter and received by said sensor while in the absence of said shielding element in the specific direction, and a specific open angle of the specified receiving range is defined as the maximum angle of said light signal passed through said shielding element and received by said sensor in the specific direction, wherein said specific open angle is smaller than said open angle.