Electric shavers

Inventors: Babu Varghese (Eindhoven, NL); Jonathan Alambra Palero (Waalre, NL); Gerardus Johannes Nicolaas Doodeman (Veldhoven, NL); Cornelis Gerardus Visser (Eindhoven, NL); Bruno Jean François Frackowiak (The Hague, NL); Peter Johannes Antonius Raedts (Sevenum, NL)

Assignee: KONINKLIJKE PHILIPS N.V.

B26B19/143 B26B19/28 B26B19/384

View Patent ↗

Loading inventors, assignments & file history…

Monitor This Case

Get email alerts when status or documents change.

Order Certified Copies

Most orders are placed with the USPTO same day — all within 24 business hours.

Order via The Patent Place →

Pre-filled with this patent's details

Quick Facts

Patent No.: US 12709034
App. No.: 18/728,501
Granted: Aug 18, 2026
Kind: B2

External Links

USPTO Patent Center↗ Full Patent PDF↗

Abstract

An electric shaver includes a first hair-cutting unit that includes a first internal cutting member; and a first external cutting member arranged to cover the first internal cutting member, where the first internal cutting member is movable relative to the first external cutting member, where the first external cutting member includes a first skin-contacting area including first hair-entry openings, where the first skin-contacting area is arranged to contact skin during shaving. The electric shaver further includes a second skin-contacting area arranged to contact the skin during shaving, and a bi-polar radio frequency (RF) generator unit configured to apply a first polarity RF voltage to the first external cutting member, where the entirety of the first external cutting member is configured to conduct the first polarity RF voltage, and where the bi-polar RF generator unit is further configured to apply a second polarity RF voltage to the second skin-contacting area.

Claims (35)

1 . An electric shaver comprising:

a first hair-cutting unit comprising:

a first internal cutting member; and

a first external cutting member arranged to cover the first internal cutting member, wherein the first internal cutting member is movable relative to the first external cutting member, wherein the first external cutting member comprises a first skin-contacting area comprising a first plurality of hair-entry openings, wherein the first skin-contacting area is arranged to contact skin during shaving;

a second skin-contacting area arranged to contact the skin during the shaving; and

a bi-polar radio frequency (RF) generator unit configured to apply a first polarity RF voltage to the first external cutting member for inducing a warming sensation across an area of the skin, and wherein an entirety of the first external cutting member is configured to conduct the first polarity RF voltage; and wherein the bi-polar RF generator unit is further configured to apply a second polarity RF voltage to the second skin-contacting area; a second hair-cutting unit comprising: a second internal cutting member; and a second external cutting member arranged to cover the second internal cutting member, wherein the second internal cutting member is movable relative to the second external cutting member wherein the second external cutting member comprises the second skin-contacting area.

2 . The electric shaver according to claim 1 , wherein a second plurality of hair-entry openings provided in the second skin-contacting area, and wherein an entirety of the second external cutting member is configured to conduct the second polarity RF voltage.

3 . The electric shaver according to claim 2 , further comprising a third hair-cutting unit comprising:

a third internal cutting member;

a third external cutting member arranged to cover the third internal cutting member, wherein the third internal cutting member is movable relative to the third external cutting member, and

wherein the third external cutting member comprises a third skin-contacting area comprising a third plurality of hair-entry openings; and

wherein the bi-polar RF generator unit is configured to apply the first polarity voltage to the third external cutting member, and wherein an entirety of the third external cutting member is configured to conduct the first polarity RF voltage.

4 . The electric shaver according to claim 3 , wherein the second hair-cutting unit is arranged between the first hair-cutting unit and the third hair-cutting unit.

5 . The electric shaver according to claim 2 , wherein the first external cutting member and the second external cutting member each comprise a shaving foil extending parallel to a longitudinal direction; and the first internal cutting member and the second internal cutting member are configured to linearly reciprocate parallel to the longitudinal direction relative to the first external cutting member and the second external cutting member, respectively.

6 . The electric shaver according to claim 3 , wherein the third external cutting member comprises a shaving foil extending parallel to the longitudinal direction, and the third internal cutting member is configured to linearly reciprocate parallel to the longitudinal direction relative to the third external cutting member.

7 . The electric shaver according to claim 2 , wherein the first skin-contacting area is annular shaped, wherein the first internal cutting member is rotatable relative to the first external cutting member; and

wherein the second skin-contacting area is annular shaped, wherein the second internal cutting member is rotatable relative to the second external cutting member.

8 . The electric shaver according to claim 1 , wherein the first and second polarity RF voltages have a frequency in a range from 0.5 MHz to 4 MHz.

9 . The electric shaver according to claim 1 , wherein the first polarity RF voltage and the second polarity RF voltage comprise a peak-to-peak voltage in a range from 10 Volts to 100 Volts.

10 . An electric shaver, comprising:

a first hair-cutting unit comprising:

a first internal cutting member; and

a first covering element that comprises a second skin-contacting area arranged to contact the skin during the shaving, wherein the first covering element is arranged on the first external cutting member in a central position relative to the first skin-contacting area such that the first skin-contacting area surrounds the second skin-contacting area, and wherein the first covering element is electrically isolated from the first external cutting member; and

a bi-polar radio frequency (RF) generator unit configured to apply a first polarity RF voltage to the first external cutting member, wherein an entirety of the first external cutting member is configured to conduct the first polarity RF voltage, and wherein the bi-polar RF generator unit is further configured to apply a second polarity RF voltage to the second skin-contacting area.

11 . The electric shaver according to claim 10 , wherein the first covering element is disc-shaped.

12 . The electric shaver according to claim 10 , wherein an entirety of the first covering element is configured to conduct the second polarity RF voltage.

13 . The electric shaver according to claim 10 , further comprising a second hair-cutting unit, wherein the second hair-cutting unit comprises a second internal cutting member and a second external cutting member arranged to cover the second internal cutting member, and wherein the second internal cutting member is rotatable relative to the second external cutting member;

wherein the second external cutting member comprises an annular shaped third skin-contacting area comprising a second plurality of hair-entry openings, wherein the third skin-contacting area is arranged to contact the skin during the shaving; and

wherein the second hair-cutting unit further comprises a second covering element that comprises a fourth skin-contacting area arranged to contact the skin during the shaving, and wherein the second covering element is arranged on the second external cutting member in a central position relative to the third skin-contacting area such that the third skin-contacting area surrounds the fourth skin-contacting area, wherein the second covering element is electrically isolated from the second external cutting member; and

wherein the bi-polar RF generator unit is configured to apply the first polarity RF voltage to the second external cutting member, and wherein an entirety of the second external cutting member is configured to conduct the first polarity RF voltage; and wherein the bi-polar RF generator unit is further configured to apply the second polarity RF voltage to the fourth skin-contacting area.

14 . The electric shaver according to claim 13 , wherein the second covering element is disc shaped.

15 . The electric shaver according to claim 13 , wherein an entirety of the second covering element is configured to conduct the second polarity RF voltage.

16 . The electric shaver according to claim 10 , wherein the first and second polarity RF voltages have a frequency in a range from 0.5 MHz to 4 MHz.

17 . The electric shaver according to claim 10 , wherein the first polarity RF voltage and the second polarity RF voltage comprise a peak-to-peak voltage in a range from 10 Volts to 100 Volts.