EP3491960B1 - Fer à friser et procédé de commande de température - Google Patents

Fer à friser et procédé de commande de température Download PDF

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Publication number
EP3491960B1
EP3491960B1 EP17204511.4A EP17204511A EP3491960B1 EP 3491960 B1 EP3491960 B1 EP 3491960B1 EP 17204511 A EP17204511 A EP 17204511A EP 3491960 B1 EP3491960 B1 EP 3491960B1
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EP
European Patent Office
Prior art keywords
hair
plates
temperature change
threshold
hair iron
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.)
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Application number
EP17204511.4A
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German (de)
English (en)
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EP3491960A1 (fr
Inventor
Hüseyin Ílker TURGUT
Tugçe ÍHAN
Sergen BILGIÇ
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.)
Vestel Elektronik Sanayi ve Ticaret AS
Original Assignee
Vestel Elektronik Sanayi ve Ticaret AS
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Priority to EP17204511.4A priority Critical patent/EP3491960B1/fr
Publication of EP3491960A1 publication Critical patent/EP3491960A1/fr
Application granted granted Critical
Publication of EP3491960B1 publication Critical patent/EP3491960B1/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
    • A45D6/00—Details of, or accessories for, hair-curling or hair-waving devices
    • A45D6/20—Devices for controlling the temperature of hair curlers

Definitions

  • the present disclosure relates to a hair iron and a method of controlling the temperature of a hair iron to prevent damage to hair being ironed by the hair iron.
  • Hair irons generally include any tools that change the appearance of a person's hair through the application of heat.
  • curling irons are used to make the hair curly
  • straightening irons or flat irons
  • crimping irons are used to create crimps of the desired size in the hair.
  • Most hair irons today use electric heating, with power being supplied to heat the hair iron heating elements.
  • the heating elements, or plates, of the hair iron are heated to high temperatures during use.
  • the application of the high temperature plates to a person's hair during use is known to cause (temporary or permanent) damage to the hair.
  • US2012312320A1 discloses a hair tool for styling hair, the hair tool having at least one heatable element, a temperature regulator associated with the heatable element to control the temperature of the heatable element, a temperature sensor for measuring the temperature of the heatable element, and a compensation means operatively connected to the temperature regulator for compensating temperature drops or increases to which the heatable element is subjected when styling a hair lock.
  • a method of controlling the temperature of a hair iron to prevent damage to hair being ironed by the hair iron comprising: whilst the hair iron is being applied to the hair, determining a temperature change of one or more plates of the hair iron over a time period starting from an initial application of the hair iron to the hair being ironed; and if the temperature change of the one or more plates over the time period is larger than a threshold, reducing the power supplied to the one or more plates.
  • the method comprises reducing the power supplied to the one or more plates by an amount based on the determined temperature change.
  • the threshold is based on an expected temperature change of the one or more plates due to the hair being ironed containing an amount of moisture.
  • the method comprises: if the temperature change of the one or more plates over the time period is less than the threshold, determining a temperature change of the one or more plates over a second time period starting from the initial application of the hair iron to the hair; and if the temperature change of the one or more plates over the second time period is larger than a threshold, reducing the power supplied to the one or more plates.
  • the method comprises preventing power from being supplied to the one or more plates if the determined temperature change over the time period is larger than a second threshold.
  • a hair iron comprising: one or more plates; at least one temperature sensor configured to monitor a temperature of at least one of the one or more plates whilst the hair iron is being applied to the hair; and a controller configured to: determine a temperature change of at least one of the one or more plates of the hair iron over a time period starting from an initial application of the hair iron to the hair being ironed; and reduce the power supplied to the one or more plates if the temperature change of the one or more plates over the time period is larger than a threshold.
  • the controller is configured to reduce the power supplied to the one or more plates by an amount based on the determined temperature change.
  • the hair iron is configured such that the threshold is based on an initial temperature of the one or more plates of the hair iron.
  • the hair iron is configured such that the threshold is based on an expected temperature change of the one or more plates due to the hair being ironed containing an amount of moisture.
  • the controller is configured to: determine a temperature change of the one or more plates over a second time period starting from the initial application of the hair iron to the hair if the temperature change of the one or more plates over the time period is less than the threshold; and reduce the power supplied to the one or more plates if the temperature change of the one or more plates over the second time period is larger than a threshold.
  • the controller is configured to prevent power from being supplied to the one or more plates if the determined temperature change over the time period is larger than a second threshold.
  • the hair iron is at least one of: a hair straightening iron; a hair crimping iron; and a hair curling iron.
  • Hair irons are designed to temporarily change the shape and/or texture of the hair through the application of heat to the hair.
  • hair straighteners are used to achieve a straightened effect by applying high temperature plates (e.g. at 250°C) to the hair.
  • the heat applied to the hair by the high temperature plates breaks down the hydrogen bonds in the hair and temporarily prevents the hair from taking a natural curly form.
  • the high temperatures to which the hair is exposed can cause short or long term damage to the hair.
  • the short term damage caused by hair straighteners can make the hair frizzier and curlier, causing the hair to appear thin and dull.
  • Long term damage known as “heat damage” is irreversible, requiring heat damaged hair to be cut off.
  • a cause of temporary or permanent damage to the hair is the deterioration of the hair structure due to the large difference in temperature between the hair being ironed and the heating elements (plates) of the hair iron. This problem of heat damage is particularly compounded by applying the hot plates to wet or damp hair.
  • FIG. 1 shows schematically an example hair iron 100.
  • the hair iron 100 has one or more heating plates or other heating elements 102.
  • the plates 102 may be made of or coated with, for example, PTFE (polytetrafluoroethylene), ceramic, tourmaline, titanium, silicone, etc.
  • the plates 102 may consist of a single layer of material, e.g. a single layer of ceramic.
  • the plates 102 may consists of multiple layers of the same or different material(s), e.g. a ceramic-coated metal plate.
  • the hair iron 100 has a power supply 104.
  • the power supply 104 may be, for example, an internal power supply 104 such as a single use or rechargeable battery. Alternatively or additionally, the power supply 104 may be a mains power supply in which case the hair iron 100 comprises a connection to the mains power supply.
  • the one or more plates 102 are operatively coupled to the power supply 104 such that power may be supplied to the one or more plates 102.
  • the hair iron 100 may have a user interface 106.
  • the user interface 106 may be a display in the form of a screen for receiving inputs from a user. Additionally or alternatively, the user interface 106 may have a control panel or actuator which can be operated by the user, e.g. by using one or more buttons, sliders, switches and/or dials of the control panel.
  • FIG. 2 shows schematically an example control system for controlling the temperature of the hair iron 200.
  • the hair iron 200 has a controller 202, such as a processor, operatively coupled to the user interface 204.
  • the controller 202 is also operatively coupled to the power supply 206 such that the power being supplied to the one or more plates 208 of the hair iron 200 can be controlled.
  • the hair iron 200 also has at least one temperature sensor 210 for monitoring the temperature of one or more of the one or more plates 208.
  • the at least one temperature sensor 210 is operatively coupled to the controller 202 to provide the controller 202 with temperature measurements of the one or more plates 208.
  • the temperature of a hair iron 100 is controlled to prevent damage to hair being ironed by the hair iron 100. Whilst the hair iron 100 is being applied to the hair, a temperature change of at least one of the one or more plates 102 of the hair iron 100 is determined over a time period starting from an initial application of the hair iron 100 to the hair being ironed. That is, each time the hair iron 100 is applied to the hair during use, a temperature change over the time period is determined. For example, when the hair iron 100 is removed from the hair, e.g. the user removes the hair iron 100 when completing a stroke of the hair iron 100 through their hair, and then reapplied to the hair, a temperature change is determined from the time of reapplying the hair iron 100. If the temperature change of the one or more plates 102 is larger than a threshold, the power supplied to the one or more plates 102 is reduced.
  • the temperature of the one or more plates 102 may be monitored by one or more temperature sensors whilst the hair iron 100 is being applied to the hair.
  • Each plate 102 may be monitored by a respective temperature sensor.
  • the time period may be less than one second, e.g. half a second or so. In some cases it may be desirable to reduce the power supplied to the one or more plates 102 if a large difference in temperature is detected upon the immediate application of the hair iron 100. This may indicate that the hair iron 100 is being applied to relatively very wet hair.
  • the time period may be one second or more than one second. That is, the time period may be set such that the power is only reduced if the temperature change occurs over a longer time period. This may indicate that only an isolated patch of hair was damp. That is, the temperature of the one or more plates may return to close to the initial temperature when applied to drier hair.
  • the time period may be configured by the user. Alternatively, the time period may be predetermined by the manufacturer of the hair iron 100.
  • the time period may be based on the initial temperature of the one or more plates 102 of the hair iron 100.
  • the higher the initial temperature of the one or more plates 102 of the hair iron 100 the smaller the time period over which the temperature change is determined.
  • the initial temperature is relatively high, e.g. at 250°C, it is desirable to reduce the temperature as quickly as possible.
  • the lower the initial temperature of the one or more plates 102 of the hair iron 100 the smaller the time period over which the temperature change is determined. For example, a large temperature change at a lower temperature change may indicate that the hair is relatively very wet as cooler, drier hair would not cause a large temperature change.
  • the power supplied to the one or more plates 102 is reduced by an amount based on the determined temperature change.
  • the amount may be proportional to the determined temperature change. That is, the higher the temperature change, the more the power is reduced from being supplied to the one or more plates 102.
  • a large temperature change indicates that the hair is relatively very wet. In such a case it may be desirable to reduce the power supplied by a large amount quickly.
  • the amount of power supplied to the one or more plates 102 is reduced based on the initial temperature of the one or more plates 102. For example, the higher the initial temperature of the one or more plates 102, the more the power supplied to the one or more plates 102 is reduced by.
  • damp or wet hair is subjected to high temperatures it is likely to become damaged. Therefore upon detection of a relatively large temperature change indicative of damp or wet hair, it is desirable to reduce the temperature to which the hair is subjected.
  • the threshold is based on an initial temperature of the one or more plates 102 of the hair iron 100.
  • the higher the initial temperature of the one or more plates 102 the smaller the threshold for which the determined temperature change must be higher in order to cause a reduction in power supplied to the one or more plates 102. That is, a smaller threshold may be beneficial when the initial temperature is relatively high so that the reduction of power is triggered more quickly. This advantageously prevents the one or more plates 102 from having to be cooled down by a large amount before the power is reduced, which in turn minimizes the damage to the hair.
  • the change in the threshold temperature may be 10°C.
  • the change in the threshold temperature may be greater or less than 10°C.
  • the higher the initial temperature of the one or more plates 102 the larger the threshold which the determined temperature change must exceed in order to cause a reduction in power to the one or more plates 102. This may prevent the power being reduced when the one or more plates 102 are applied to dry hair that happens to be cooler than the one or more degrees by a large amount, e.g. due to environmental factors.
  • the threshold may be based on the time period over which the temperature change is determined. For example, the threshold may be greater for greater time periods. This may account for small fluctuations in the determined temperature that are not caused by damp or wet hair. In another example, the threshold may be smaller for greater time periods. Advantageously, this may result in the detection of a damp or wet patch of hair amongst an otherwise dry head of hair.
  • the threshold may be based on both the initial temperature of the one or more plates 102 and the time period over which the temperature change is to be determined.
  • the threshold is based on an expected temperature change of the one or more plates 102 due to the hair being ironed containing an amount of moisture. For example, empirical data may show that the temperature of the one or more plates 102 of the hair iron 100 change by (approximately) 20°C in (approximately) half a second when applied to damp or wet hair. The threshold may then be set at this temperature such that the power reduction occurs when the hair iron 100 is applied to damp or wet hair. In another example, the data may show that damp or wet hair is damaged if the one or more plates 102 are subjected to a change in temperature of more than 15°C over a time period of one second. The threshold may then be set at 15°C.
  • the power may be reduced when conditions known to result from damp or wet hair are detected.
  • a temperature change of the one or more plates 102 is determined over a second time period starting from the initial application of the hair iron 100 to the hair; and if the temperature change of the one or more plates 102 over the second time period is larger than a threshold, the power supplied to the one or more plates 102 is reduced.
  • the section(s) of hair that have been e.g. straightened by the hair iron 100 may have been dry during the first time period. However, sections of damp or wet hair may be straightened during the second time period.
  • the temperature of the one or more plates 102 is monitored for a second time period (e.g. the temperature is continuously monitored from the initial application).
  • the threshold to cause a reduction in power after monitoring for the second time period may be smaller than, equal to, or greater than the threshold to cause a reduction in power after monitoring for the (first) time period.
  • power is prevented from being supplied to the one or more plates 102 if the determined temperature change is larger than a second threshold.
  • the hair is prevented from being exposed to relatively high temperatures if the hair is extremely wet.
  • the second threshold may be based on a temperature change known to cause damage to damp or wet hair.
  • the second threshold may be based on a temperature change indicative of the hair iron 100 being applied to a substance other than the user's hair, e.g. fabric. This advantageously prevents damage to the hair iron 100 and/or the substance. This may also reduce the risk of the substance catching fire.
  • the at least one temperature sensor monitors the temperature of the one or more plates 102 whilst the hair iron 100 is being applied to the hair.
  • the controller determines a temperature change of the one or more plates 102 of the hair iron 100 over a time period starting from an initial application of the hair iron 100 to the hair being ironed. If the temperature change of the one or more plates 102 is larger than a threshold, the controller reduces the power supplied to the one or more plates 102.
  • the controller may reduce the power supplied to the one or more plates 102 by an amount based on the determined temperature change.
  • the threshold is based on an initial temperature of the one or more plates 102 of the hair iron 100.
  • the threshold is based on an expected temperature change of the one or more plates 102 due to the hair being ironed containing an amount of moisture.
  • the controller determines that the temperature change of the one or more plates 102 is less than the threshold, the controller determines a temperature change of the one or more plates 102 over a second time period starting from the initial application of the hair iron 100 to the hair. If the temperature change of the one or more plates 102 is larger than a threshold, the controller reduces the power supplied to the one or more plates 102.
  • the controller prevents power from being supplied to the one or more plates 102, e.g. by switching off the hair iron 100.
  • the hair iron 100 is at least one of: a hair straightening iron, a hair crimping iron, and a hair curling iron.
  • Figure 3 shows an example method for controlling the temperature of a hair iron 100 to prevent damage to hair being ironed by the hair iron 100.
  • the method starts at Step S02.
  • the controller determines a temperature change of the one or more plates 102 of the hair iron 100 over a time period starting from an initial application of the hair iron 100 to the hair being ironed.
  • Step S06 the controller determines if the determined temperature change is greater than a threshold. If the determined temperature change is less than the threshold, the method reverts back to S04.
  • Step S08 the controller determines if the determined temperature change is greater than a second threshold.
  • the controller reduces the power supplied to the one or more plates 102 if the determined temperature change is less than the second threshold but greater than the (first) threshold. Alternatively, if the determined temperature change is greater than the (first) threshold at Step S06, the controller may immediately reduce the power being supplied to the plates 102 instead of continuing to Step S08.
  • Step S12 the power is prevented from being supplied to the one or more plates 102 if the determined temperature change is greater than the second threshold.
  • controller and its components as shown in Figure 2 are represented as a schematic block diagram for the purposes of explaining the functionality of the controller only.
  • each component of the controller is a functional block for performing the functionality ascribed to it herein.
  • Each component may be implemented in hardware, software, firmware, or a combination thereof. Additionally, although described as separate components of the controller, some or all of the functionality may be performed by a single piece of hardware, software, or firmware.
  • processor or processing system or circuitry referred to herein may in practice be provided by a single chip or integrated circuit or plural chips or integrated circuits, optionally provided as a chipset, an application-specific integrated circuit (ASIC), field-programmable gate array (FPGA), digital signal processor (DSP), graphics processing units (GPUs), etc.
  • the chip or chips may comprise circuitry (as well as possibly firmware) for embodying at least one or more of a data processor or processors, a digital signal processor or processors, baseband circuitry and radio frequency circuitry, which are configurable so as to operate in accordance with the exemplary embodiments.
  • the exemplary embodiments may be implemented at least in part by computer software stored in (non-transitory) memory and executable by the processor, or by hardware, or by a combination of tangibly stored software and hardware (and tangibly stored firmware).
  • the invention also extends to computer programs, particularly computer programs on or in a carrier, adapted for putting the invention into practice.
  • the program may be in the form of non-transitory source code, object code, a code intermediate source and object code such as in partially compiled form, or in any other non-transitory form suitable for use in the implementation of processes according to the invention.
  • the carrier may be any entity or device capable of carrying the program.
  • the carrier may comprise a storage medium, such as a solid-state drive (SSD) or other semiconductor-based RAM; a ROM, for example a CD ROM or a semiconductor ROM; a magnetic recording medium, for example a floppy disk or hard disk; optical memory devices in general; etc.
  • SSD solid-state drive
  • ROM read-only memory
  • magnetic recording medium for example a floppy disk or hard disk
  • optical memory devices in general etc.

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Claims (15)

  1. Procédé de contrôle de la température d'un fer à cheveux (100) pour éviter d'endommager des cheveux en train d'être repassés par le fer à cheveux (100), le procédé consistant à :
    tandis que le fer à cheveux (100) est en train d'être appliqué sur les cheveux, déterminer un changement de température d'une ou plusieurs plaques (102) du fer à cheveux (100) au cours d'une période de temps démarrant à partir d'une application initiale du fer à cheveux (100) sur les cheveux en train d'être repassés ; et
    si le changement de température desdites une ou plusieurs plaques (102) au cours de la période de temps est supérieur à un seuil, réduire la puissance fournie auxdites une ou plusieurs plaques (102).
  2. Procédé selon la revendication 1, consistant à réduire la puissance fournie auxdites une ou plusieurs plaques (102) d'une quantité sur la base du changement de température déterminé.
  3. Procédé selon la revendication 1 ou 2, dans lequel le seuil est basé sur une température initiale desdites une ou plusieurs plaques (102) du fer à cheveux (100).
  4. Procédé selon l'une quelconque des revendications 1 à 3, dans lequel le seuil est basé sur un changement de température attendu desdites une ou plusieurs plaques (102) en raison des cheveux en train d'être repassés qui contiennent une quantité d'humidité.
  5. Procédé selon l'une quelconque des revendications 1 à 4, consistant à :
    si le changement de température desdites une ou plusieurs plaques (102) au cours de la période de temps est inférieur au seuil, déterminer un changement de température desdites une ou plusieurs plaques (102) au cours d'une deuxième période de temps démarrant à partir de l'application initiale du fer à cheveux (100) sur les cheveux ; et
    si le changement de température desdites une ou plusieurs plaques (102) au cours de la deuxième période de temps est supérieur à un seuil, réduire la puissance fournie auxdites une ou plusieurs plaques (102).
  6. Procédé selon l'une quelconque des revendications 1 à 5, consistant à :
    empêcher la fourniture de puissance auxdites une ou plusieurs plaques (102) si le changement de température déterminé au cours de la période de temps est supérieur à un deuxième seuil.
  7. Fer à cheveux (100) comprenant :
    une ou plusieurs plaques (102) ;
    au moins un capteur de température (210) configuré de manière à surveiller une température d'au moins une desdites une ou plusieurs plaques (102) tandis que le fer à cheveux (100) est en train d'être appliqué sur les cheveux ; et
    un contrôleur (202) configuré de manière à :
    déterminer un changement de température d'au moins une desdites une ou plusieurs plaques (102) du fer à cheveux (100) au cours d'une période de temps démarrant à partir d'une application initiale du fer à cheveux (100) sur les cheveux en train d'être repassés ; et
    réduire la puissance fournie auxdites une ou plusieurs plaques (102) si le changement de température desdites une ou plusieurs plaques (102) au cours de la période de temps est supérieur à un seuil.
  8. Fer à cheveux (100) selon la revendication 7, le contrôleur (202) étant configuré de manière à réduire la puissance fournie auxdites une ou plusieurs plaques (102) d'une quantité sur la base du changement de température déterminé.
  9. Fer à cheveux (100) selon la revendication 7 ou 8, configuré de telle sorte que le seuil est basé sur une température initiale desdites une ou plusieurs plaques (102) du fer à cheveux (100).
  10. Fer à cheveux (100) selon l'une quelconque des revendications 7 à 9, configuré de telle sorte que le seuil est basé sur un changement de température attendu desdites une ou plusieurs plaques (102) en raison des cheveux en train d'être repassés qui contiennent une quantité d'humidité.
  11. Fer à cheveux (100) selon l'une quelconque des revendications 7 à 10, configuré de telle sorte que le seuil est basé sur la période de temps au cours de laquelle le changement de température est déterminé.
  12. Fer à cheveux (100) selon l'une quelconque des revendications 7 à 11, configuré de telle sorte que la période de temps est basée sur la température initiale desdites une ou plusieurs plaques (102).
  13. Fer à cheveux (100) selon l'une quelconque des revendications 8 à 12, le contrôleur (202) étant configuré de manière à :
    déterminer un changement de température desdites une ou plusieurs plaques (102) au cours d'une deuxième période de temps démarrant à partir de l'application initiale du fer à cheveux (100) sur les cheveux, si le changement de température desdites une ou plusieurs plaques (102) au cours de la période de temps est inférieur au seuil ; et
    réduire la puissance fournie auxdites une ou plusieurs plaques (102) si le changement de température desdites une ou plusieurs plaques (102) au cours de la deuxième période de temps est supérieur à un seuil.
  14. Fer à cheveux (100) selon l'une quelconque des revendications 8 à 13, le contrôleur (202) étant configuré de manière à empêcher la fourniture de puissance auxdites une ou plusieurs plaques (102) si le changement de température déterminé au cours de la période de temps est supérieur à un deuxième seuil.
  15. Fer à cheveux (100) selon l'une quelconque des revendications 8 à 14, dans lequel le fer à cheveux (100) est au moins l'un parmi :
    - un fer à lisser les cheveux ;
    - un fer à crêper les cheveux ; et
    - un fer à friser les cheveux.
EP17204511.4A 2017-11-29 2017-11-29 Fer à friser et procédé de commande de température Active EP3491960B1 (fr)

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EP17204511.4A EP3491960B1 (fr) 2017-11-29 2017-11-29 Fer à friser et procédé de commande de température

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EP17204511.4A EP3491960B1 (fr) 2017-11-29 2017-11-29 Fer à friser et procédé de commande de température

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EP3491960A1 EP3491960A1 (fr) 2019-06-05
EP3491960B1 true EP3491960B1 (fr) 2020-08-26

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GB2615804A (en) * 2022-02-21 2023-08-23 Dyson Technology Ltd A haircare appliance

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KR20140058494A (ko) * 2011-06-13 2014-05-14 쿨웨이 인코포레이티드 동적이고 최적인 모발 스타일링 온도 제어를 위한 모발 관리 도구 및 방법
JP6628504B2 (ja) * 2015-06-16 2020-01-08 向井　孝 ヘアーアイロン

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