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Electric shaver

Electric shavers are commonly used to shave facial and body hair. Many people prefer electric shavers to razors because the cutting blades of electric shavers do not contact the skin, thereby reducing the risk of nicks, cuts and other skin irritations. Electric shavers are generally constructed from a main body case and a cutter head section. The main body case is held in hand during shaving, and it contains an electric motor, a power supply switch and a power supply that supplies power to the electric motor. The cutter head section is mounted on the upper portion of the main body case, and it contains an outer cutter and inner cutter. In electric shavers, hair is introduced into outer cutters in which hair introduction openings are formed, and the hair that has been introduced into the areas inside the outer cutters is cut by inner cutters disposed inside the outer cutters. In an electric shaver that has a plurality of cutter units in the cutter head, a single oscillator (oscillating member) is connected to an eccentric pin that is eccentrically disposed on a motor joint portion. Generally, a blade of an electric shaver is provided with an exterior blade formed in a sheet-shape having a plurality of apertures, and an interior blade which slides on the bottom surface of the exterior blade relative to the exterior blade. In reciprocating-type electric shavers, an inner cutter reciprocates while making sliding contact with the inside surface of an outer cutter which has substantially an inverted U shape when seen from the side, thus cutting hair entered in the slits formed in the outer cutter. In the reciprocating electric shaver, a cutter head is installed on the upper portion of a shaver main body that includes a driving source (motor), a driving mechanism, a power supply, an operating switch, etc. The cutter head is comprised of one or more main cutter units and an auxiliary cutter unit, which are installed side by side. Each of the main cutter units comprises a combination of a foil-form outer cutter and an inner cutter that makes a reciprocating motion while making sliding contact with the inside surface of the outer cutter. The auxiliary cutter unit comprises a combination of a slit-form outer cutter and an inner cutter that makes a reciprocating motion while making sliding contact with the inside surface of the outer cutter. Rotary electric shavers rely primarily upon the rotation of circular cutting elements within the shaver heads and hand movements of the entire shaver across the surface of facial skin in order to maximize the volume of hair shaved and how closely the hair is shaved. In electric rotary shavers, inner cutters are rotated on the under surface of outer cutters; and the hair is cut by the shearing force generated between these two cutters. Rotary type shavers and reciprocating type shavers are used, for example, depending on skin and beard conditions. Further, these different types of electric shavers are provided with trimmer blades for cutting hair such as sideburns, and with outer blade slits for pulling in and cutting curled whiskers.

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