| 摘要 |
A personal care device, such as a shaving apparatus, provided with at least one cutting unit (21) comprising an external cutting member (23) and an internal cutting member (22) which is moveable relative to the external cutting member (23) in at least one direction of movement. A virtual skin plane (10) is located on a side of the external cutting member (23) facing away from the internal cutting member (22). The virtual skin plane (10) extends parallel to said direction of movement and parallel to a skin surface when the cutting unit (21) is in an operational position relative to the skin surface. The internal cutting member (22) comprises a plurality of cutting elements (39) each comprising a first cutting edge (50). A projection of the first cutting edge (50) in the virtual skin plane (10) encloses at least a first shearing angle with said direction of movement. The external cutting member (23) comprises a plurality of hair-entry apertures (34) each comprising a second cutting edge (51) for cooperation with at least one of the first cutting edges (50). A projection of the second cutting edge (51) in the virtual skin plane (10) encloses at least a second shearing angle with the direction of movement. For at least 60% (per cent) of all hair-entry apertures (34) of the external cutting member (23) which comprise a second cutting edge (51) for cooperation with at least one of the first cutting edges (50) of the internal cutting member (22), projections of the first and second cutting edges (50, 51) in a plane extending perpendicularly to the direction of movement enclose, respectively, a first inclination angle and a second inclination angle with the virtual skin plane (10) of the cutting unit (21), wherein the first and second inclination angles and the first and second shearing angles are selected such that, at least in a starting position of cutting a virtual cylindrical hair (70) with a diameter of 150 microns, situated in a cutting position in the hair-entry aperture (34) and extending perpendicularly to the virtual skin plane(10), the first cutting edge (50) is in contact with the virtual cylindrical hair (70) in a first contact position (74) and the second cutting edge (51) is in contact with the virtual cylindrical hair (70) in a second contact position (75), wherein the first contact position (74) is closer to the virtual skin plane (10) than the second contact position (75). |
