# US 12,178,306 B2 · Mask and skin care device including same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,178,306 B2 - Document ID: US12178306B2 - Status: Granted - Kind: B2 - Application number: 17/616,264 - Filed: 2020-05-29 - Published: 2022-10-06 - Granted: 2024-12-31 - Earliest claimed: 2019-06-14 - Assignees: LG Innotek Co., Ltd. - Applicants: LG Innotek Co., Ltd. - Inventors: Beom Sun Hong; Hae Rok Son; Joon Jae Oh; Gyu Lin Lee - Web page: https://patentgrep.com/patent/US12178306B2 ## CPC - A45D 44/002: {Masks for cosmetic treatment of the face} - A61F 7/02: Compresses or poultices for effecting heating or cooling - A61H 23/0245: {with ultrasonic transducers, e.g. piezoelectric} - A61M 35/10: {Wearable devices, e.g. garments, glasses or masks} - A61N 7/00: Ultrasound therapy (lithotripsy A61B17/22, A61B17/225; massage using supersonic vibration A61H23/00 {; using ultrasound for introducing media into the body A61M37/0092}) - A61N 7/02: Localised ultrasound hyperthermia - B06B 1/0276: {with simultaneous generation, e.g. with modulation, harmonics} - B06B 1/0629: {Square array} - B06B 1/0644: {using a single piezoelectric element (B06B1/0688 takes precedence)} - A45D 2200/155: Heating or cooling means, i.e. for storing or applying cosmetic products at a predetermined temperature - A45D 2200/207: Vibration, e.g. ultrasound - A61F 2007/0003: {Face} - A61F 2007/0095: {with a temperature indicator} - A61F 2007/0203: {Cataplasms, poultices or compresses, characterised by their contents; Bags therefor} - A61H 2201/0207: heated - A61H 2201/0214: cooled - A61H 2201/105: with means for delivering media, e.g. drugs or cosmetics - A61H 2201/1604: Head - A61H 2201/165: Wearable interfaces - A61H 2201/5005: for controlling frequency distribution, modulation or interference of a driving signal - A61H 2201/5058: Sensors or detectors - A61H 2201/5082: Temperature sensors - A61H 2205/022: Face - A61M 2037/0007: {having means for enhancing the permeation of substances through the epidermis, e.g. using suction or depression, electric or magnetic fields, sound waves or chemical agents} - A61N 2007/0034: {Skin treatment} - B06B 2201/76: Medical, dental - A45D: HAIRDRESSING OR SHAVING EQUIPMENT (wigs, toupees or the like A41G3/00, A41G5/00; hairdressers' chairs A47C1/04; hair cutting appliances, razors B26B); EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING - A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C) - A61H: PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY (electrotherapy, magnetotherapy, radiation therapy or ultrasound therapy A61N) - A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)} - A61N: ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY (measurement of bioelectric currents A61B; surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body A61B18/00; anaesthetic apparatus in general A61M; incandescent lamps H01K; infrared radiators for heating H05B) - B06B: METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, {e.g.} FOR PERFORMING MECHANICAL WORK IN GENERAL (for particular applications, see the relevant subclasses, e.g. B07B1/40, B23Q17/12, B24B31/06; measurement of mechanical vibrations G01H; in direction finding, locating, distance or velocity measuring G01S; {generating seismic energy G01V1/02}; control of mechanical vibrations in general G05D; sound-producing devices, e.g. bells, sirens, whistles G10K, {e.g. methods or devices for transmitting, conducting, or directing sound in general G10K11/00}; generation of electrical oscillations H03B; electromechanical resonators in general H03H; electromechanical transducers {for communication techniques, e.g. microphones, speakers} H04R) ## Abstract A mask, according to an embodiment, comprises: a first wiring disposed on a first base layer; a piezoelectric element disposed on the first wiring; a second wiring disposed on the piezoelectric element; a second base layer disposed on the second wiring; a protective layer disposed between the first and second base layers and surrounding the first wire, the second wire, and the piezoelectric element; and a control unit which controls a driving frequency of the piezoelectric element. The control unit controls the driving frequency of the piezoelectric element in a frequency band defined as a first range, and the temperature of the piezoelectric element changes by means of the control of the driving frequency of the control unit. ## Claims ### Claim 1 A mask comprising: a first wiring disposed on a first base layer; a piezoelectric element disposed on the first wiring; a second wiring disposed on the piezoelectric element; a second base layer disposed on the second wiring; a protective layer disposed between the first and second base layers and surrounding the first wiring, the second wiring, and the piezoelectric element; and a control unit for controlling a driving frequency of the piezoelectric element, wherein the control unit controls the driving frequency of the piezoelectric element in a frequency band defined as a first range, and a temperature of the piezoelectric element is changed by controlling the driving frequency by the control unit, wherein the frequency band of the first range includes a resonant frequency of the piezoelectric element, and is lower than an anti-resonant frequency of the piezoelectric element, and wherein a temperature of the piezoelectric element when the driving frequency is the resonant frequency of the piezoelectric element is higher than a temperature of the piezoelectric element when the driving frequency is higher than the resonant frequency of the piezoelectric element and is lower than a temperature of the piezoelectric element when the driving frequency is lower than the resonant frequency of the piezoelectric element. ### Claim 2 (depends on 1) The mask of claim 1, wherein the first range satisfies the following [Equation 1], and a constant k value below is 0.2 to 0.3 fo=fr±k*(fa−fr) [Equation 1] (fo: driving frequency of piezoelectric element, fr: resonant frequency of piezoelectric element, k: constant, fa: anti-resonant frequency of piezoelectric element). ### Claim 3 (depends on 2) The mask of claim 2, wherein the constant k value is 0.22 to 0.27. ### Claim 4 (depends on 1) The mask of claim 1, wherein the control unit sets a first frequency defined as a frequency band higher than the resonant frequency of the piezoelectric element as the driving frequency to reduce the temperature of the piezoelectric element. ### Claim 5 (depends on 1) The mask of claim 1, wherein the control unit sets a second frequency defined as a frequency band lower than the resonant frequency of the piezoelectric element as the driving frequency to increase the temperature of the piezoelectric element. ### Claim 6 (depends on 1) The mask of claim 1, further comprising a sensing unit for sensing a temperature of the mask. ### Claim 7 (depends on 1) The mask of claim 1, further comprising: a first substrate disposed between the first base layer and the first wiring; and a second substrate disposed between the second base layer and the second wiring. ### Claim 8 (depends on 1) The mask of claim 1, wherein the first base layer, the second base layer, and the protective layer include the same material. ### Claim 9 (depends on 1) The mask of claim 1, wherein a thickness of the first base layer is equal to or smaller than a thickness of the second base layer. ### Claim 10 (depends on 9) The mask of claim 9, wherein the thickness of the first base layer and the second base layer is 50 μm to 10 mm. ### Claim 11 (depends on 1) The mask of claim 1, wherein at least one of the first wiring and the second wiring includes a curvature pattern of 3R to 20R (mm). ### Claim 12 (depends on 1) The mask of claim 1, wherein the piezoelectric element generates ultrasonic energy of 10 KHz to 1 MHz. ### Claim 13 A temperature control method of a mask including a plurality of operation modes, wherein the mask includes: a control unit for controlling a driving frequency of a piezoelectric element; and a sensing unit for sensing a temperature of the mask, the temperature control method comprising: setting the operation mode; setting the driving frequency of the piezoelectric element; and operating at the set driving frequency, wherein the control unit controls the driving frequency of the piezoelectric element in a frequency band defined as a first range, a temperature of the piezoelectric element is changed by controlling the driving frequency by the control unit, wherein the frequency band of the first range includes a resonant frequency of the piezoelectric element, and is lower than an anti-resonant frequency of the piezoelectric element, and wherein a temperature of the piezoelectric element when the driving frequency is the resonant frequency of the piezoelectric element is higher than a temperature of the piezoelectric element when the driving frequency is higher than the resonant frequency of the piezoelectric element and is lower than a temperature of the piezoelectric element when the driving frequency is lower than the resonant frequency of the piezoelectric element. ### Claim 14 (depends on 13) The method of claim 13, wherein the first range satisfies the following [Equation 1], and a constant k value below is 0.2 to 0.3 fo=fr±k*(fa−fr) [Equation 1] (fo: driving frequency of piezoelectric element, fr: resonant frequency of piezoelectric element, k: constant, fa: anti-resonant frequency of piezoelectric element). ### Claim 15 (depends on 14) The method of claim 14, wherein when a heating mode is set in the setting of the operation mode, the control unit sets a frequency band lower than the resonant frequency of the piezoelectric element as the driving frequency in the setting of the driving frequency. ### Claim 16 (depends on 14) The method of claim 14, wherein when a cooling mode is set in the setting of the operation mode, the control unit sets a frequency band higher than the resonant frequency of the piezoelectric element as the driving frequency in the setting of the driving frequency. ### Claim 17 (depends on 15) The method of claim 15, wherein the operating at the driving frequency includes sensing the temperature of the mask, and when the temperature of the mask is greater than or equal to a set temperature in the sensing of the temperature, the control unit corrects the driving frequency of the piezoelectric element to a frequency band greater than the driving frequency currently in operation. ### Claim 18 (depends on 13) The method of claim 13, wherein the sensing unit senses a surface temperature of the mask in contact with a user's skin. ### Claim 19 (depends on 1) A skin care device comprising: a main body in which one side thereof is open and including an accommodation space inside the open region; and a mask disposed in the open region and connected to the main body, wherein the mask includes a mask according to claim 1.