Patent ID: 9274330
Filing Date: 2016-03-01
CPC Classification: G02B

Claim Text:
1. An optical filter arrangement, having a cut wavelength for light passing there through, configured to be positioned in a wireless device relative to a light detecting unit, the optical filter arrangement comprising a stack of a first optical layer and a second optical layer, and an electro active polymer material arranged between the first and second optical layers such that the cut wavelength is adjusted upon application of an electrical voltage to the electro active polymer material; wherein the optical filter arrangement is a switchable band pass filter in an infrared spectrum, and the optical filter arrangement is positioned in front of the light detecting unit relative to a direction of the passing light; wherein a thickness of the electro active polymer material changes upon the application of the electrical voltage, which changes a distance between the first optical layer and the second optical layer to adjust the cut wavelength; and wherein the electro active polymer material is in a shape of a helix and arranged at a periphery of the first and second optical layers to define an air gap between the first and second optical layers.