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202results about How to "Reduce skin irritation" patented technology

Detector for birefringent objects

InactiveUS20120002204A1Improving hair detection efficiencyHigh shaving efficacyMaterial analysis by optical meansLight polarisation measurementHuman bodyOptical radiation
The invention relates to a detector and a method, adapted for detecting a birefringent object near a surface, and to a shaving device adapted for detecting and for cutting a hair near a skin surface of a human body part or an animal body part. The detector (26) comprises a source (27) adapted for emitting optical radiation comprising at least a first wavelength, a second wavelength and an incident polarization state, and an imaging unit (28) adapted for imaging the birefringent object near the surface, wherein the imaging unit (28) comprises a detection unit (29) adapted for detecting optical radiation scattered and/or reflected by the birefringent object and/or the surface at the first wavelength and at the second wavelength, and a control unit adapted for processing a signal from the detection unit (29) for discrimination between the birefringent object and the surface, wherein the detection unit (29) is arranged for detecting scattered and/or reflected optical radiation coming from the birefringent object and/or the surface, comprising a first polarization state corresponding to the incident polarization state and a second polarization state being different from the first polarization state. In this way, detection efficiency and thus shaving quality are increased, at the same time energy consumption is reduced and also shaving safety is improved.
Owner:KONINKLIJKE PHILIPS ELECTRONICS NV
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