EP3416521B1 - Séchage et coiffure des cheveux par ultrasons - Google Patents

Séchage et coiffure des cheveux par ultrasons Download PDF

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Publication number
EP3416521B1
EP3416521B1 EP17704502.8A EP17704502A EP3416521B1 EP 3416521 B1 EP3416521 B1 EP 3416521B1 EP 17704502 A EP17704502 A EP 17704502A EP 3416521 B1 EP3416521 B1 EP 3416521B1
Authority
EP
European Patent Office
Prior art keywords
hair
ultrasound
styling
mhz
drying
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP17704502.8A
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German (de)
English (en)
Other versions
EP3416521A1 (fr
Inventor
Tim TIELEMANS
Marco Baragona
Babu Varghese
Jonathan Alambra PALERO
Wouter Hendrik Cornelis SPOORENDONK
Johan Lub
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips NV
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Publication date
Application filed by Koninklijke Philips NV filed Critical Koninklijke Philips NV
Priority to PL17704502T priority Critical patent/PL3416521T3/pl
Publication of EP3416521A1 publication Critical patent/EP3416521A1/fr
Application granted granted Critical
Publication of EP3416521B1 publication Critical patent/EP3416521B1/fr
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Classifications

    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D1/00—Curling-tongs, i.e. tongs for use when hot; Curling-irons, i.e. irons for use when hot; Accessories therefor
    • A45D1/28—Curling-tongs, i.e. tongs for use when hot; Curling-irons, i.e. irons for use when hot; Accessories therefor with means for controlling or indicating the temperature
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D1/00—Curling-tongs, i.e. tongs for use when hot; Curling-irons, i.e. irons for use when hot; Accessories therefor
    • A45D1/06—Curling-tongs, i.e. tongs for use when hot; Curling-irons, i.e. irons for use when hot; Accessories therefor with two or more jaws
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D20/00—Hair drying devices; Accessories therefor
    • A45D20/04—Hot-air producers
    • A45D20/08—Hot-air producers heated electrically
    • A45D20/10—Hand-held drying devices, e.g. air douches
    • A45D20/12—Details thereof or accessories therefor, e.g. nozzles, stands
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D7/00—Processes of waving, straightening or curling hair
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D2200/00—Details not otherwise provided for in A45D
    • A45D2200/20—Additional enhancing means
    • A45D2200/207—Vibration, e.g. ultrasound

Definitions

  • the invention relates to an ultrasound hair care device and method for drying and styling hair.
  • hair styling as used herein is intended to encompass all actions such as hair crimping, curling, perming and straightening.
  • US 2012/0291797 discloses a hair styling apparatus that includes a hair-heating device for applying heat to hair.
  • the hair-heating device has a moisture-temperature setting and a dry-temperature setting less than moisture-temperature setting.
  • a moisture sensor detects a moisture-indicating parameter of the hair, and generates a moisture-indicating signal indicative of whether the hair is at or below a predetemlined moisture threshold level.
  • a control circuit adjusts the temperature of the hair-heating device from the moisture-temperature setting to the dry-temperature setting in response to the moisture sensor generating a moisture indicating signal indicative of the hair being at or below the predetermined moisture threshold level.
  • the hair-heating device is active in the dry-temperature setting.
  • US 2006/0272669 discloses hair styling appliances that utilize ultrasonic vibration for hair styling, and mentions that it is possible to atomize moisture inside hair to evaporate the moisture by ultrasonic vibration, even under room temperature. It is thus not necessary to use an extremely high temperature (e.g., 130° C) in order to evaporate moisture inside hair, which high temperature causes denaturation of protein and scald.
  • an extremely high temperature e.g. 130° C
  • the document EP1728450A2 discloses an ultrasound hair care device comprising an ultrasound unit.
  • the present invention is based on the new insight that nebulizing (the water for drying the hair) and styling with optimized but distinctively different ultrasound frequencies have significant benefits over using a single frequency range for both styling and drying with ultrasound. Moreover, styling can only be done in an optimal way when the hairs are dry. Drying the hairs before styling makes the styling to be performed at higher temperature which results in better retention of style and quicker styling so hairs will be exposed to high temperature for shorter periods of time. Both conventional and surface acoustic wave based ultrasound nebulization elements can be implemented in the haircare device.
  • a first aspect of the invention provides an ultrasound hair care device for drying and styling hair.
  • An ultrasound unit applies ultrasound to the hair.
  • a hair moisture measurement unit measures a moisture level of the hair.
  • a control unit controls the ultrasound unit based on the moisture level.
  • ultrasound is applied to the hair at a first frequency not exceeding 1 MHz for drying the hair, and/or at a second frequency of at least 1 MHz for styling the hair in dependence on the moisture level.
  • the first frequency does not exceed 0.5 MHz, and preferably does not exceed 0.4 MHz.
  • the second frequency is advantageously at least 5 MHz, and preferably between 6.4 MHz and 500 MHz.
  • An ultrasound intensity is advantageously at least 1 W/cm 2 , and preferably does not exceed 10 W/cm 2 .
  • the control unit may comprise a look-up-table for switching the ultrasound unit to operate at the first frequency and/or at the second frequency in dependence on the moisture level.
  • a second aspect of the invention provides a hair care method of drying and styling hair, using said ultrasound hair care device, the hair care method comprising measuring a hair moisture level; and applying ultrasound to the hair at a first frequency not exceeding 1 MHz for drying the hair and/or at a second frequency of at least 1 MHz for styling the hair in dependence of the hair moisture level.
  • ultrasound is applied during a period not exceeding 2 minutes, and preferably not exceeding 1 minute.
  • Fig. 1 shows an embodiment of an ultrasound hair care device 10 for drying hair and styling of hair.
  • a first ultrasound generator 12 generates ultrasound at a frequency between 20 kHz to 0.4 MHz.
  • a second ultrasound generator 14 generates ultrasound at a frequency between 6.4 MHz to 500 MHz.
  • a first ultrasound transducer 16 in electrical communication with the first ultrasound generator 12 applies ultrasound to the water in hair lock 20 for nebulizing the water in hair lock as to dry hair.
  • a second ultrasound transducer 18 in electrical communication with the second ultrasound generator 14 applies ultrasound to the hair lock 20 to style the hair.
  • a hair moisture measurement unit 22 measures the moisture level of the hair lock 20.
  • a control unit 24 controls a level of energy of the first ultrasound generator 12 and the second ultrasound generator 14 based on the measured hair moisture level as to provide optimum drying and styling to the hair.
  • Nebulization by means of ultrasound can be achieved within a frequency range of 20 kHz - 1 MHz. To prevent cavitation, a frequency range of 20 kHz - 0.4 MHz is preferably selected. Styling by means of ultrasound can be achieved within a frequency range of 1 MHz - 500 MHz. To prevent cavitation, a frequency range of 6.4 MHz - 500 MHz could be selected. Finally, moisture sensing by means of ultrasound can be achieved within a frequency range of 100 kHz to 1 MHz. The preferred range of intensity of an effective ultrasound-based hair styling device is between 1 W/cm 2 and 10 W/cm 2 measured at the transducer-hair interface.
  • Fig. 2 schematically represents how the ultrasound frequencies for drying D and styling S can be applied over time.
  • Starting with wet hair initially relatively much ultrasound energy is applied at the ultrasound frequency for drying D, and relatively little ultrasound energy is applied at the ultrasound frequency for styling S.
  • the amount of ultrasound energy applied at the ultrasound frequency for drying D becomes smaller, and the amount of ultrasound energy applied at the ultrasound frequency for styling S becomes larger.
  • ultrasound styling and drying can be accomplished with different as well as overlapping frequency ranges.
  • An average power limit of 10 W/cm 2 and application time was set to max 60 s to maintain practical relevance.
  • Fig. 3 illustrates ultrasound threshold intensities of the three identified main mechanisms involved in hair drying and styling as a function of ultrasound intensity.
  • the horizontal axis indicates frequencies in MHz, and the vertical axis indicates the threshold intensity in W/cm 2 .
  • Curve A shows the threshold for styling through ultrasound heating (assuming all power is absorbed by hairs, 60 s).
  • Curve B shows the threshold for styling through ultrasound heating (60% relative humidity, matched to experiments, 60 s).
  • Curve C shows the threshold for nebulization (typical water film thickness), and curves C1 - C2 show thresholds for nebulization (limits for 2-10 ⁇ m water film thickness).
  • Curve D shows the threshold for cavitation.
  • Region 1 is a preferred region for ultrasound based styling (heating + cavitation).
  • Region 2 is a preferred region for ultrasound based drying (nebulization).
  • Region 3 is a preferred region for ultrasound based styling & drying.
  • Region 4 is a preferred region for ultrasound based styling (heating).
  • cavitation For cavitation to take place at least a thin film of liquid has to be present on the hairs.
  • cavitation can play a role to enhance the drying process. Styling should preferably only take place once the hair has fully dried to prevent cavitation from happening. Especially at higher power cavitation can damage the hair structure. In this case two non-overlapping frequencies are preferred for several reasons: We favor styling through ultrasound heating and/or non-thermal without cavitation. (Region 1). Cavitation may decrease the power needed, but it also brings increased risk of damaging the hairs (Region 1). We do not exclude to use cavitation for styling, but preferably it is not used.
  • a combined ultrasound styling & drying effect requires a very narrow frequency range and a setup with little losses (Region 3).
  • the threshold for styling through ultrasound heating will lie somewhere between the threshold as predicted by 100% absorption of ultrasound power in hairs (Curve A) and less efficient absorption of ultrasound power in hairs as found in experiments (Curve B), thus significantly shrinking the preferred region for ultrasound based styling & drying (Region 3).
  • Variation in moisture content, relative humidity, hair density, hair diameter, volume etc. will all influence the preferred region for ultrasound based styling and drying, making it very hard to predict the right settings let alone to predetermine said parameters to fall in a viable frequency range for styling and drying. Therefore, in practice the preferred regions for styling (Region 2) or drying (Region 4) are better defined and more robust than the preferred region for styling and drying (Region 3).
  • Fig. 4 shows a second embodiment of an ultrasound hair care device for drying and styling hair in accordance with the present invention.
  • the main features of the ultrasound hair drying system of Fig. 4 include an ultrasound generator 100, an ultrasound amplifier 101, three ultrasound transducers 102A, 102B, 102C (one for styling, one for drying, one for moisture sensing), a droplet handler 105, water film and droplets 103, 103A, a control system 106, a user interface 107, and a thermal detector 108 to prevent overheating.
  • the ultrasound generator 100 generates fixed or variable low-voltage ultrasound pulses, with frequency, voltage and pulse duration controlled by the control system 106 depending on treatment settings selected through the user interface 107 and the moisture content of the hairs detected by the ultrasound receiver 102C. This will enable atomization of liquid (103A, 103B) from the hair surface 104.
  • the resulting droplets will be removed or extracted by the droplet handler 105, which could be a simple air blower/extractor or something more
  • the hair care device can then be made to be safe for use if it is carefully designed such that:
  • Piezoelectric crystals are used to produce ultrasound (> 20 kHz).
  • Non-piezoelectric techniques like Capacitance Micro-machined Ultrasonic Transducers (CMUT) can be used for higher frequencies (typically up to ⁇ 100 MHz) and can be used with this invention. These techniques use relatively small transducers and are cheaper, thereby making it attractive for both home use and semi-professional hair care applications.
  • CMUT Capacitance Micro-machined Ultrasonic Transducers
  • CMUT transducers are used, a single ultrasound transducer may be used for both ultrasound frequencies. It is possible to have a hard switch between the different ultrasound frequencies in that below a certain moisture level the first frequency is produced while above that moisture level the second frequency is produced. It is alternatively possible to have a soft switch allowing for a gradual reduction of the intensity of the ultrasound produced at the first frequency, and a gradual increase of the intensity of the ultrasound produced at the second frequency, as a result of a decreasing moisture level of the hair. In such a soft switching embodiment, a look-up table is preferably used in the control unit for determining the intensities of the ultrasound produced at the first and second frequencies in dependence of the moisture level.
  • any reference signs placed between parentheses shall not be construed as limiting the claim.
  • the word “comprising” does not exclude the presence of elements or steps other than those listed in a claim.
  • the word "a” or “an” preceding an element does not exclude the presence of a plurality of such elements.
  • the invention may be implemented by means of hardware comprising several distinct elements, and/or by means of a suitably programmed processor. In the device claim enumerating several means, several of these means may be embodied by one and the same item of hardware. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Landscapes

  • Cleaning And Drying Hair (AREA)
  • Cosmetics (AREA)

Claims (8)

  1. Dispositif de traitement des cheveux par ultrasons (10) pour sécher et coiffer les cheveux (20, 104), le dispositif de traitement des cheveux par ultrasons (10) comprenant:
    une unité à ultrasons (12-18; 100-102B) pour appliquer les ultrasons aux cheveux (20; 104);
    une unité de mesure de l'humidité des cheveux (22, 102C) pour mesurer un niveau d'humidité des cheveux (20; 104); et
    une unité de contrôle (24; 106) pour contrôler l'unité à ultrasons (12-18, 100-102B) sur la base du niveau d'humidité, dans laquelle, en fonction du niveau d'humidité, les ultrasons sont appliqués aux cheveux (20; 104) à une première fréquence ne dépassant pas 1 MHz pour sécher les cheveux (20; 104), et/ou à une deuxième fréquence d'au moins 1 MHz pour coiffer les cheveux (20; 104).
  2. Dispositif de traitement des cheveux par ultrasons (10) selon la revendication 1, dans lequel la première fréquence ne dépasse pas 0.5 MHz, et de préférence, ne dépasse pas 0.4 MHz.
  3. Dispositif de traitement des cheveux par ultrasons (10) selon la revendication 1 ou 2, dans lequel la deuxième fréquence est au moins de 5 MHz, et de préférence entre 6.4 MHz et 500 MHz.
  4. Dispositif de traitement des cheveux par ultrasons (10) selon l'une des revendications précédentes, dans lequel une intensité des ultrasons est au moins de 1 W/cm2.
  5. Dispositif de traitement des cheveux par ultrasons (10) selon l'une des revendications précédentes, dans lequel une intensité des ultrasons ne dépasse pas 10 W/cm2.
  6. Dispositif de traitement des cheveux selon l'une des revendications précédentes, dans lequel l'unité de contrôle (24, 106) comprend une table de consultation pour commuter l'unité à ultrasons (12-18; 100-102B) afin qu'elle fonctionne à la première fréquence et/ou à la deuxième fréquence en fonction du niveau d'humidité.
  7. Procédé de traitement des cheveux pour le séchage et la coiffure des cheveux, en utilisant un dispositif de traitement des cheveux par ultrasons (10) selon l'une des revendications précédentes, le procédé de traitement des cheveux comprenant:
    mesurer un niveau d'humidité des cheveux ; et
    appliquer, en fonction du niveau d'humidité des cheveux, des ultrasons aux cheveux à une première fréquence ne dépassant pas 1 MHz pour le séchage des cheveux et/ou à une deuxième fréquence d'au moins 1 MHz pour la coiffure des cheveux.
  8. Procédé de coiffure des cheveux selon la revendication 7, dans lequel les ultrasons sont appliqués pendant une durée ne dépassant pas 2 minutes, et de préférence, ne dépassant pas 1 minute.
EP17704502.8A 2016-02-17 2017-02-16 Séchage et coiffure des cheveux par ultrasons Active EP3416521B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL17704502T PL3416521T3 (pl) 2016-02-17 2017-02-16 Suszenie i stylizacja włosów ultradźwiękami

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP16156168.3A EP3207817A1 (fr) 2016-02-17 2016-02-17 Séchage et coiffure des cheveux par ultrasons
PCT/EP2017/053461 WO2017140757A1 (fr) 2016-02-17 2017-02-16 Séchage et coiffure de cheveux à ultrasons

Publications (2)

Publication Number Publication Date
EP3416521A1 EP3416521A1 (fr) 2018-12-26
EP3416521B1 true EP3416521B1 (fr) 2020-04-08

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Family Applications (2)

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EP16156168.3A Withdrawn EP3207817A1 (fr) 2016-02-17 2016-02-17 Séchage et coiffure des cheveux par ultrasons
EP17704502.8A Active EP3416521B1 (fr) 2016-02-17 2017-02-16 Séchage et coiffure des cheveux par ultrasons

Family Applications Before (1)

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EP16156168.3A Withdrawn EP3207817A1 (fr) 2016-02-17 2016-02-17 Séchage et coiffure des cheveux par ultrasons

Country Status (6)

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US (1) US20210204667A1 (fr)
EP (2) EP3207817A1 (fr)
CN (1) CN108697217B (fr)
ES (1) ES2792081T3 (fr)
PL (1) PL3416521T3 (fr)
WO (1) WO2017140757A1 (fr)

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EP3935993A1 (fr) 2020-07-07 2022-01-12 Koninklijke Philips N.V. Sèche-cheveux

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Also Published As

Publication number Publication date
ES2792081T3 (es) 2020-11-10
CN108697217A (zh) 2018-10-23
EP3416521A1 (fr) 2018-12-26
EP3207817A1 (fr) 2017-08-23
CN108697217B (zh) 2022-08-12
US20210204667A1 (en) 2021-07-08
WO2017140757A1 (fr) 2017-08-24
PL3416521T3 (pl) 2020-11-02

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