Hair-stubble detector for an electrical shaver
Publication Date: 2005-May-17
The IP.com Prior Art Database
"Hair-stubble detector for an electrical shaver"
A hair-stubble detector for an electrical shaver is described. The detector comprises a carrier that is mounted to the shaver via at least one force sensor, for example a piezo- electric sensor. The carrier comprises a number of holes or other kind of openings wherein stubbles present on human skin can penetrate when the shaver is moved over the skin. The form and dimensions of said holes or openings are such that stubbles can penetrate in the holes or openings, but skin wrinkles cannot penetrate therein.
When a stubble penetrates into a hole present on the carrier, a force will be exerted on the carrier that is registrated by the force sensor. When the shaver is moved over the skin, stubbles will continuously enter the holes and leave the holes again. This process will be visible as a continuous series of peak signals in the output signal of the force sensor. The output signal is processed by an electrical processor to provide the user of the shaver with an indication of the density of the stubbles on the skin. Thus the user is immediately informed about the result of the shaving process. If no peak signals are measured anymore, this may be an indication that a certain portion of the skin is smooth enough.
The carrier may for example be in the form of a round disc having a pattern of hair catching slits.
The hair stubble detector may be used in any kind of shaver, including electrical rotary or vibratory shavers,...