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WO2024245655A1 - Dispositif d'inspection d'une partie du corps humain comprenant deux types de sources de lumière - Google Patents

Dispositif d'inspection d'une partie du corps humain comprenant deux types de sources de lumière Download PDF

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Publication number
WO2024245655A1
WO2024245655A1 PCT/EP2024/061462 EP2024061462W WO2024245655A1 WO 2024245655 A1 WO2024245655 A1 WO 2024245655A1 EP 2024061462 W EP2024061462 W EP 2024061462W WO 2024245655 A1 WO2024245655 A1 WO 2024245655A1
Authority
WO
WIPO (PCT)
Prior art keywords
light source
light
human body
radiation
observation window
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.)
Pending
Application number
PCT/EP2024/061462
Other languages
English (en)
Inventor
Benjamin ASKENAZI
Emmanuel Malherbe
Thierry Wasserman
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.)
LOreal SA
Original Assignee
LOreal SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by LOreal SA filed Critical LOreal SA
Publication of WO2024245655A1 publication Critical patent/WO2024245655A1/fr
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
    • A61B5/0075—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence by spectroscopy, i.e. measuring spectra, e.g. Raman spectroscopy, infrared absorption spectroscopy
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/44—Detecting, measuring or recording for evaluating the integumentary system, e.g. skin, hair or nails
    • A61B5/448—Hair evaluation, e.g. for hair disorder diagnosis
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
    • G02B19/0019—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having reflective surfaces only (e.g. louvre systems, systems with multiple planar reflectors)
    • G02B19/0023—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having reflective surfaces only (e.g. louvre systems, systems with multiple planar reflectors) at least one surface having optical power
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
    • G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
    • G02B19/0061—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a LED
    • 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
    • A45D44/00—Other cosmetic or toiletry articles, e.g. for hairdressers' rooms
    • A45D2044/007—Devices for determining the condition of hair or skin or for selecting the appropriate cosmetic or hair treatment

Definitions

  • Such devices generally comprise an illumination arrangement configured to illuminate the portion of the human body to be inspected.
  • the illumination arrangement can be advantageous for the illumination arrangement to project collimated light radiation, i.e., radiation with rays that are substantially parallel to one another, onto the portion of the human body to be inspected.
  • Known devices then comprise a plurality of light sources, with each light source being associated with at least one lens for collimating the light from the light source towards the portion of the human body to be inspected.
  • Patent application WO 2018/127784 A1 discloses a system for optically acquiring data from hair.
  • the system comprises an LED as the light source, as well as a spectrometer or camera as the optical measurement instrument.
  • Patent US 7508508 B2 discloses a device for inspecting a hair, skin or scalp sample.
  • the device comprises a measurement area configured to receive a sample and an imaging unit for receiving the light flux reflected from the measurement area.
  • the imaging unit produces an image of the hair sample located in the measurement area.
  • the device further comprises a spectral analysis unit configured to receive the light flux.
  • the spectral analysis unit delivers spectral analysis measurements of the hair sample as a function of the received light flux.
  • Patent application WO 2020/173628 A1 discloses a device for inspecting a keratin surface of a user, preferably a hair sample, comprising a housing, in which an image sensor is arranged for receiving measurement light emitted from a measurement area configured to receive the keratin surface, through a measurement window in a front wall of the housing, onto a corresponding imaging light path, with the device also being equipped with a lighting ring arranged in the rear of the housing for the measurement window around the imaging light path, said lighting ring having two opposed partially peripheral lighting parts separated by two opposed additional partially peripheral non-lighting parts, with the lighting parts also being configured to illuminate the measurement area through the measurement window on a lighting light path, with said lighting light path having an angle of incidence ranging between 30° and 60°, preferably of approximately 45°.
  • the lighting parts can be controlled independently; by taking photos with light sources that can be illuminated separately, additional information can be extracted, such as hair damage, by comparing the two images. For example, raised hair cuticles would result in different light levels being scattered in each direction.
  • having independently controlled LEDs allows different lighting to be provided when imaging the keratin surface.
  • the light sources can be LEDs, more specifically High-CRI white LEDs were used to cover the entire visible spectrum as well as possible.
  • a controlled beam and stable lighting are extremely important.
  • the light sources must maintain the same power and spectrum over time and on different instruments. In order to ensure consistency over time, most devices correct any drift using daily or weekly calibrations.
  • one aim is to propose more eco-responsible devices by reducing the number of LEDs used.
  • the invention relates to a cosmetic device for inspecting a portion of the human body, comprising a frame defining an observation window for observing the portion of the human body, an optical sensor, configured to pick up measurement light radiation originating from the portion of the human body, and an illumination arrangement, configured to illuminate the portion of the human body through the observation window, with the illumination arrangement comprising a first lighting part formed by at least one first light source producing a first emitted light radiation and a second lighting part formed by at least one second light source producing a second emitted light radiation;
  • control module configured to control the first lighting part and the second lighting part independently of each other
  • the illumination arrangement comprises at least one optical system capable of generating collimated radiation towards the observation window so as to illuminate the portion of the human body, and the control module independently controls the first lighting part and the second lighting part,
  • the second light source has a second proximal colour temperature varying by less than 1 % after 1000 hours of use.
  • the second light source comprises features that are calibrated and stable over time. These features are basically represented by the digital value of the second proximal colour temperature, the variation of which after 1000 hours of use represents its stability over time. A small time variation in the proximal colour temperature represents a stable second light source.
  • the first light sources can be stable over time.
  • they can be identical to the second light sources.
  • the first light sources nevertheless generate a less controlled beam and less stable lighting than the second light sources, so that the first light sources can be mainly used in the “standby” mode of the device in order to save the second light sources, which are reserved for the “measurement” mode of the device.
  • This particular choice of first and second light sources constitutes a preferred embodiment of the device according to the invention.
  • the proximal colour temperature is defined as follows:
  • the device according to the invention provides a direct view of the first light sources, notably of the LEDs, which are advantageously selected so as to be inexpensive, preferably with a low colour rendering index and producing an uncontrolled beam, while saving on the second light sources, notably high-end LEDs, calibrated for short bursts targeted at precise measurements and used during the measurements.
  • At least one second calibrated and stable light source producing a controlled beam of light is used.
  • the Applicant has selected second light sources, notably high-end LEDs, that are properly calibrated and laboratory-tested, and has advantageously added other first light sources, notably LEDs, which the device will use for all the applications that do not require colorimetric precision.
  • the second light sources notably the high-end LEDs, will only be used in short bursts for image capturing and will age extremely slowly over the lifetime of the instrument.
  • the lifetime of the second light sources should be high with this method, i.e., approximately 5 years of average use of the device.
  • Another advantage of the device according to the invention is to provide a second light path in the device, which can be used for other applications, such as comparing the “scattering” and directional response of the material, and computing properties therefrom, such as the sheen of the material, which can be useful for deriving fat, for example.
  • the invention also relates to a method for inspecting a portion of the human body implemented by means of an inspection device as described above, the method comprising the following steps: placing the portion of the human body opposite the observation window of the frame, the first light source producing emitted light radiation, the first light source extinguishing the emitted light radiation and the second light source producing emitted light radiation.
  • the invention also relates to a method for manufacturing a device for inspecting a portion of the human body as defined above, with the manufacturing method comprising the following steps: providing a model of a device for inspecting a portion of the human body that is not adapted, an illumination arrangement comprising a first lighting part formed by at least one first light source of the model being configured to produce a model of emitted light radiation and a reflecting surface of the model being disposed between the first lighting part and an observation window, adapting the illumination arrangement by adding a second lighting part formed by at least one second light source producing a second emitted light radiation, the reflecting surface being disposed between the second lighting part and the observation window, manufacturing the device for inspecting a portion of the human body, said device comprising an illumination arrangement manufactured based on that of the model.
  • the concave mirror 32 defines a different optical focal point, with said optical focal points together defining the region of optical convergence. Consequently, the concave mirror, even if it can be likened to a parabolic mirror, is not generally strictly parabolic.
  • the geometry of the concave mirror 32 is obtained by digital simulations, for example.
  • the geometry of the concave mirror is obtained, for example, following an iterative digital simulation taking into account the relative position of the at least one light source 30, the concave mirror 32 and the observation window 26, with the observation window allowing the position of the portion 12 of the human body to be determined.
  • the emitted light radiation A1, A2 diverging from a given light source 30, 300 is collimated by the concave mirror 32 by forming the reflected light radiation B1, B2.
  • Collimated is understood to mean that the rays forming the reflected light radiation B1, B2 substantially extend parallel to each other as far as the observation window 26.
  • the angle formed between any two rays of the collimated reflected radiation B1, B2 is less than 5° and preferably is less than 2°. It will be understood herein that only the portion of the emitted radiation A1, A2 reflected by the concave mirror 32, and forming the reflected light radiation B1, B2, is collimated.
  • the length of the reflected light radiation B1, B2, i.e., the length of the light radiation extending between the concave mirror 32 and the portion 12 of the human body preferably ranges between 20 mm and 60 mm, and even more preferably between 30 mm and 40 mm.
  • the vertical distance, i.e., along the observation axis O-O’, between the point where the emitted light ray A1, A2 is reflected as reflected radiation B1, B2, and the portion 12 of the human body ranges between 15 mm and 45 mm, and preferably between 20 mm and 35 mm.
  • the reflected light radiation B1, B2 is collimated towards the observation window 26 so as to illuminate the portion 12 of the human body, when the portion 12 of the human body is disposed opposite the observation window 26.
  • the reflected light radiation B1, B2 is particularly intended to pass through the observation window 26.
  • the reflected light radiation B1, B2 thus collimated is, for example, intended to be reflected by the portion 12 of the human body, with the light radiation thus reflected by the portion 12 of the human body forming the measurement radiation C1, C2, for example.
  • the reflected light radiation B1, B2 passes through, for example, the window plane F by forming an angle ranging between 30° and 60°, preferably between 40° and 50° and even more preferably between 42° and 48°, relative to the window plane F.
  • the reflected light radiation B1, B2 passes through the window plane F by forming an angle of 45° relative to the window plane F.
  • the second light sources 300 are switched off and the first light sources 30 are switched on, in standby mode, for example.
  • the illumination arrangement 18 preferably comprises a single concave mirror 32, as illustrated in .
  • the single concave mirror 32 is then configured to reflect the emitted light radiation A1, A2, successively produced by the one or each light source 30, respectively 300, into reflected light radiation B1, respectively B2.
  • the distal edge 36 extends, for example, in a plane, for example, in a plane substantially parallel to the observation window 26.
  • the concave mirror 32 is a mirror rotating about the observation axis O-O’
  • the distal edge 36 is, for example, circular in a plane substantially parallel to the observation window 26.
  • the illumination arrangement 18 comprises a plurality of concave mirrors 32
  • the distal edge 36 of each mirror 32 is, for example, a portion of a circle extending in a plane substantially parallel to the observation window 26.
  • the distal edge 36 is preferably proximally offset from the observation window 26 by a distance ranging between 0 mm and 50 mm, and preferably between 10 and 30 mm, with the distance preferably being measured perpendicular to the plane formed by the observation window 26.
  • the observation window 26 is offset along the observation axis O-O’, towards the portion 12 of the human body, by a distance ranging between 5 mm and 50 mm, and preferably between 10 and 30 mm.
  • the device 10 comprises an inner pane 40.
  • the inner pane 40 is housed in abutment against the distal edge 36 of the mirror 32, with the inner pane 40 then substantially extending, for example, in the plane formed by the distal edge 36.
  • a portion of the human body is firstly placed opposite the observation window 26 of the frame 14. For example, a lock of hair is placed opposite said observation window 26.
  • the portion 12 of the human body is then preferably aligned with the observation axis O-O’.
  • the emitted light radiation A2 is then produced by the at least one light source 300 ( ).
  • Each source 300 produces emitted light radiation, for example.
  • the source 300 which has a high colour rendering index, is switched on.
  • the emitted light radiation A2 is reflected by the concave mirror 32.
  • the reflected light ray B2 thus obtained by reflecting the emitted light ray A2 onto the concave mirror 32 is collimated towards the observation window 26.
  • reflecting the emitted light radiation A2 onto the concave mirror 32 collimates said emitted light ray A2 into reflected light radiation B2 reflected towards the observation window 26.
  • the measurement radiation C2 originating from the portion of the human body is then picked up by the optical sensor 16.
  • the optical sensor 16 and/or a processing module are then configured to determine the visual properties of the portion 12 of the human body based on the measurement radiation C2, and to determine the features associated with such properties.
  • the light source 300 can be switched off and the light source 30 is switched on ( ) before determining a new area of hair for taking a new measurement.
  • the light source 300 is switched on in order to take the measurement and the light source 30 is switched off.
  • the incline of the reflected radiation B1, B2 relative to the observation window plane F is particularly interesting for improving the lighting of the portion 12 of the human body, with such lighting limiting, for example, any undesirable reflections onto the portion 12 of the human body.
  • control module is particularly advantageous for adapting the use of the inspection device to different usage contexts.
  • the use of a number of light sources 30, 300, ranging between four and twelve light sources, allows lighting to be provided by collimated emitted light rays A1, A2 originating from several different orientations, which allows the precision of the device to be improved.
  • the particular orthoradial positioning of the light sources as described above also allows lighting to be obtained that is particularly suitable for elongated objects such as locks of hair, while limiting the specular reflection associated with such elongated objects.
  • the use of a single concave mirror means that the inspection device 10 is particularly easy to assemble and particularly economical to build.
  • light-emitting diodes is also particularly appropriate for limiting manufacturing costs, while having a light source 30, 300 with emitted light radiation A1, A2 properties that are adapted to be used in an inspection device 10.
  • FIG. 1 shows a printed circuit board with light-emitting diodes, optionally integrating power supply blocks and lights integrated into the optical system of the device.
  • An objective lens housing 77 fitted with a CMOS sensor board 78, is placed in the centre of the printed circuit board 79.
  • the printed circuit board is placed above the lighting zone 80 defining the field of vision 81.
  • the first light sources 30, eight in number, are equally distributed over an inner ring.
  • the second light sources 300, six in number, are equally distributed over an outer ring.
  • FIG. 1 shows another example of a printed circuit board with light-emitting diodes comprising eight first light sources 30 and four second light sources 300.
  • the board is mounted on a receiving platform 82.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Medical Informatics (AREA)
  • Surgery (AREA)
  • Biophysics (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Veterinary Medicine (AREA)
  • Molecular Biology (AREA)
  • Public Health (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Dermatology (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

L'invention concerne un dispositif cosmétique (10) pour inspecter une partie (12) du corps humain, comprenant : un cadre (14) définissant une fenêtre d'observation (26) pour observer la partie (12) du corps humain ; un capteur optique (16) et un agencement d'éclairage (18), configuré pour éclairer la partie (12) du corps humain à travers la fenêtre d'observation (26), l'agencement d'éclairage (18) comprenant au moins une première source de lumière (30) et une seconde partie d'éclairage (400) formée par au moins une seconde source de lumière (300), ainsi qu'au moins une surface réfléchissante (34), la seconde source de lumière (300) ayant un second indice de rendu de couleur supérieur à un premier indice de rendu de couleur de la première source de lumière (30).
PCT/EP2024/061462 2023-06-02 2024-04-25 Dispositif d'inspection d'une partie du corps humain comprenant deux types de sources de lumière Pending WO2024245655A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR2305522A FR3149383A1 (fr) 2023-06-02 2023-06-02 Dispositif d’inspection d’une portion de corps humain comportant deux types de sources lumineuses
FRFR2305522 2023-06-02

Publications (1)

Publication Number Publication Date
WO2024245655A1 true WO2024245655A1 (fr) 2024-12-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2024/061462 Pending WO2024245655A1 (fr) 2023-06-02 2024-04-25 Dispositif d'inspection d'une partie du corps humain comprenant deux types de sources de lumière

Country Status (2)

Country Link
FR (1) FR3149383A1 (fr)
WO (1) WO2024245655A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1277436A1 (fr) * 2001-07-09 2003-01-22 L'oreal Instrument pour observer la peau ou les cheveux
US7508508B2 (en) 2006-09-19 2009-03-24 Seethrough Ltd. Device and method for inspecting a hair sample
WO2017025613A1 (fr) * 2015-08-13 2017-02-16 Philips Lighting Holding B.V. Lampe veilleuse
EP3315060A1 (fr) * 2015-06-16 2018-05-02 LG Electronics Inc. Dispositif électronique
WO2018127784A1 (fr) 2017-01-06 2018-07-12 Coloright Ltd. Porte-cheveux, lecteur de cheveux comprenant celui-ci, et procédés d'acquisition optique de données à partir de cheveux
WO2020173628A1 (fr) 2019-02-27 2020-09-03 L'oreal Dispositif et procédé d'inspection d'échantillon capillaire
US20200375466A1 (en) * 2018-02-27 2020-12-03 Koninklijke Philips N.V. Obtaining images for use in determining one or more properties of skin of a subject
WO2021141804A1 (fr) * 2020-01-06 2021-07-15 Optimum Semiconductor Technologies Inc. Amélioration de la précision du rendu de couleurs d'un dispositif d'éclairage à del grâce à l'ajout d'éléments de lumière monochromatique

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1277436A1 (fr) * 2001-07-09 2003-01-22 L'oreal Instrument pour observer la peau ou les cheveux
US7508508B2 (en) 2006-09-19 2009-03-24 Seethrough Ltd. Device and method for inspecting a hair sample
EP3315060A1 (fr) * 2015-06-16 2018-05-02 LG Electronics Inc. Dispositif électronique
WO2017025613A1 (fr) * 2015-08-13 2017-02-16 Philips Lighting Holding B.V. Lampe veilleuse
WO2018127784A1 (fr) 2017-01-06 2018-07-12 Coloright Ltd. Porte-cheveux, lecteur de cheveux comprenant celui-ci, et procédés d'acquisition optique de données à partir de cheveux
US20200375466A1 (en) * 2018-02-27 2020-12-03 Koninklijke Philips N.V. Obtaining images for use in determining one or more properties of skin of a subject
WO2020173628A1 (fr) 2019-02-27 2020-09-03 L'oreal Dispositif et procédé d'inspection d'échantillon capillaire
WO2021141804A1 (fr) * 2020-01-06 2021-07-15 Optimum Semiconductor Technologies Inc. Amélioration de la précision du rendu de couleurs d'un dispositif d'éclairage à del grâce à l'ajout d'éléments de lumière monochromatique

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"The voice of the lighting industry", January 2019, LIGHTING EUROPE, article "Guide for evaluating the performance capabilities of LED lights"

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