Skin treatment device

A skin treatment device, comprising:

• a skin treatment member for performing a skin treatment on skin to be treated, wherein the skin treatment member comprises a blade adapted for cutting hair present on an area of the skin to be treated;
• a first sensor configured to sense a motion direction of the skin treatment member;
• a skin contacting surface, separate from the blade, for contacting the skin;
• a mount for mounting the skin treatment member and the skin contacting surface in the skin treatment device;
• and
• a friction controlling device comprising a reciprocating strip that reciprocates at a set frequency, the friction controlling device being configured and arranged to control friction between the skin contacting surface and the skin to be treated in a controlled friction area of the skin contacting surface during use when the skin contacting surface is moved over the skin, wherein the controlled friction area excludes the blade;
• wherein the friction controlling device is adapted to introduce a slip motion of the controlled friction area relative to the mount in a direction corresponding to a local direction of extension of the skin contacting surface and deviating from the motion direction, wherein the slip motion causes a slip between the controlled friction area and the skin to reduce friction between the controlled friction area and the skin;
• wherein the skin treatment device further comprises a second sensor configured and arranged for detecting a first parameter, the first parameter being related to the friction between the skin contacting surface and the skin to be treated, during use, wherein the friction controlling device is adapted to control a second parameter of the slip motion in dependence on a value of the first parameter detected by the second sensor,
• wherein the skin contacting surface is provided with a hair-entry aperture via which the hair is provided to the blade, and wherein the first parameter is an amount of skin doming in the hair-entry aperture during use.

A skin treatment device, comprising:

• a skin treatment member for performing a skin treatment on skin to be treated, wherein the skin treatment member includes a blade adapted for cutting hair present on an area of the skin to be treated;
• at least one sensor configured to sense a motion direction of the skin treatment member;
• a skin contacting surface, separate from the blade, for contacting the skin;
• a mount for mounting the skin treatment member and the skin contacting surface in the skin treatment device;
• a friction controlling device comprising a reciprocating strip and configured and arranged to control friction between the skin contacting surface and the skin to be treated in a controlled friction area of the skin contacting surface during use when the skin contacting surface is moved over the skin to be treated, wherein the reciprocating strip is movable relative to the mount in a longitudinal direction of the reciprocating strip;
• and
• a responsive-material actuating device for realizing a reciprocating motion of the reciprocating strip relative to the mount in the longitudinal direction,
• wherein the friction controlling device is adapted to introduce a slip motion of the controlled friction area relative to the mount in a direction corresponding to a local direction of extension of the skin contacting surface and deviating from the motion direction;
• wherein the at least one sensor configured and arranged for detecting a first parameter, the first parameter being related to the friction between the skin contacting surface and the skin to be treated, during use, wherein the friction controlling device is adapted to control a second parameter of the slip motion in dependence on a value of the first parameter detected by the at least one sensor,
• wherein the responsive-material actuating device comprises two elongated electro-active polymer strips of an expandable material, wherein first end portions of the two elongated electro-active polymer strips are connected to, respectively, a first end portion of the reciprocating strip and a second end portion of the reciprocating strip, and wherein second end portions of the two elongated electro-active polymer strips are connected to the mount of the skin treatment device in positions in a vicinity of, respectively, the second end portion of the reciprocating strip and the first end portion of the reciprocating strip.