Device for inspecting a portion of the human body and associated method

Abstract

Device for inspecting a portion of a human body and associated method This device for inspecting a portion of a human body (12), comprises: - a frame (14), defining an observation window (26); - an optical sensor, configured to capture a measurement light radiation (C) coming from the portion of the human body (12), and - an illumination arrangement, configured to illuminate the portion of the human body (12), the illumination arrangement comprising at least one light source (30), each light source (30) being configured to produce an emitted light radiation (A). The illumination arrangement comprises at least one concave mirror (32) configured to reflect the emitted light radiation (A) produced by at least one of the light sources (30) into a reflected light radiation (B), the reflected light radiation (B) being collimated towards the observation window (26) so as to illuminate the portion of the human body (12). Figure for abstract: Figure 3

Description

Title of the invention: Device for inspecting a portion of the human body and associated method

[0001] The present invention relates to a device for inspecting a portion of the human body comprising:

[0002] - a frame, defining an observation window of the portion of the human body,

[0003] - an optical sensor, configured to capture a measuring light radiation coming from the portion of human body, and

[0004] - an illumination arrangement, configured to illuminate the body portion human, the illumination arrangement comprising at least one light source, each light source being configured to produce emitted light radiation.

[0005] In order to determine the visual properties of a portion of the human body, and the characteristics associated with such properties, it is customary to use devices for inspecting a portion of the human body. Such devices are, for example, intended for inspecting the skin of a human body or even the hair of a human body.

[0006] Such devices generally comprise an illumination arrangement configured to illuminate the portion of the human body to be inspected. In order to obtain a precise inspection, it may be advantageous for the illumination arrangement to project collimated light radiation, i.e. the rays of which are substantially parallel to each other, onto the portion of the human body to be inspected.

[0007] The known devices then comprise a plurality of light sources, 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.

[0008] However, such devices are not entirely satisfactory. Indeed, the integration of lenses to collimate the light from each light source proves to be expensive and cumbersome. Thus, such a device, although allowing precise inspection, proves to be expensive and cumbersome.

[0009] An aim of the invention is then to obtain a device for inspecting a portion of the human body which is precise, while being less expensive and less bulky.

[0010] To this end, the invention relates to an inspection device as mentioned above, in which the illumination arrangement comprises at least one concave mirror, the at least one concave mirror being configured to reflect the emitted light radiation produced by at least one of the light sources into reflected light radiation, the reflected light radiation being collimated towards the observation window. so as to illuminate the portion of the human body.

[0011] The use of a concave mirror configured to reflect light radiation emitted by collimating such radiation is particularly interesting since it ensures illumination allowing precise inspection of the portion of the human body, while limiting the size and cost of the collimation device. The reflected light radiation thus collimated is particularly suitable for limiting specular reflections. Such light radiation also allows good color rendering, which is particularly advantageous in the case where the light radiation captured by the sensor is processed, for example, to extract colorimetric information.

[0012] According to other advantageous aspects of the invention, the device for inspecting a portion of the human body comprises one or more of the following characteristics, taken in isolation or in any technically possible combination:

[0013] - the at least one concave mirror defines at least one optical convergence region, the or each light source being arranged in the or one of the optical convergence region(s);

[0014] - the observation window defines a window plane, the light radiation reflected crossing the window plane at an angle of between 30° and 60°, preferably between 40° and 50° and more preferably between 42° and 48°, relative to the window plane;

[0015] - the frame extends along an observation axis, the optical sensor being arranged on the observation axis, the measuring light radiation being parallel to the observation axis;

[0016] - the device comprises a control module configured to control the or each light source;

[0017] - the illumination arrangement comprises between four and twelve light sources;

[0018] - the device comprises at least two light sources, the frame extending along of an observation axis, the observation axis crossing the observation window, each light source being radially at the same non-zero distance from the observation axis;

[0019] - the device comprises at least four light sources, the orthoradial spacing between two light sources of two pairs of adjacent light sources being greater than the orthoradial distance of the other pairs of adjacent light sources, the light sources being symmetrical along a plane of symmetry comprising the observation axis;

[0020] - the at least one concave mirror is the only concave mirror of the arrangement of illumination, the concave mirror being a mirror of revolution and being configured to reflect the emitted light radiation produced by the or each light source in reflected light radiation;

[0021] - each light source is a light-emitting diode;

[0022] - the at least one concave mirror comprises a distal edge, the distal edge being proxi- badly offset from the observation window by a distance between 0 mm and 50 mm; and

[0023] - the device comprises an inner window housed in support on the distal edge of the mirror.

[0024] The invention further relates to a method for inspecting a portion of the human body implemented by means of an inspection device as mentioned above, the method comprising the following steps:

[0025] - positioning of the portion of the human body opposite the observation window of the building,

[0026] - production of light radiation emitted by the at least one light source;

[0027] - reflection of the light ray emitted by the at least one concave mirror, the reflected light radiation being collimated towards the observation window;

[0028] - reflection of the light ray reflected by the portion of the human body, the ray reflected by the portion of the human body forming a measuring light radiation; and

[0029] - capture of the measuring radiation coming from the portion of the human body by the optical sensor of the inspection device.

[0030] The invention further relates to a method of manufacturing a device for inspecting a portion of the human body as mentioned above, the manufacturing method comprising the following steps:

[0031] - provision of a model of a device for inspecting a portion of a body unadapted human, each light source of the modeling being configured to produce a modeling of emitted light radiation, the at least one concave mirror of the modeling being configured to reflect the modeling of the emitted light radiation into a modeling of reflected light radiation, the modeling of reflected light radiation being reflected towards the modeling of the observation window without being collimated;

[0032] - adaptation of the geometry of the at least one concave mirror of the modeling, of such that the reflected light radiation model is collimated by the concave mirror model to the observation window model; and

[0033] - manufacturing of the device for inspecting a portion of the human body, said device comprising at least one concave mirror manufactured on the basis of the adapted geometry of the at least one concave mirror of the modeling.

[0034] The invention will be better understood on reading the description which follows, given solely by way of non-limiting example and made with reference to the drawings on which:

[0035] [Fig.l] [Fig.l] is a schematic perspective view of a device for inspecting a portion of the human body;

[0036] [Fig.2] [Fig.2] is a schematic perspective view of the inspection device of [Fig.l], in which a frame of the device is not shown;

[0037] [Fig.3] [Fig.3] is a schematic diagram of the inspection device of Figures 1 and 2.

[0038] In the remainder of the description, the term "distal" is used to designate a position far from the user holding the device and the term proximal is used to designate a position close to the user holding the device, a distal element thus being further from the user holding the device than a proximal element.

[0039] With reference to [Fig.l], a device 10 for inspecting a portion of the human body 12, comprises a frame 14. As illustrated in [Fig.2], the device further comprises an optical sensor 16, an illumination arrangement 18 and comprises for example a control module 20.

[0040] The inspection device 10 is intended to evaluate parameters specific to the portion of the human body 12.

[0041] The portion of human body 12 is for example a portion of skin of an individual or a set of keratin fibers of an individual, such as for example a lock of hair of the individual. The inspection device 10 is then for example intended to inspect a lock of hair, and is for example configured to determine the color and / or the shine of such a lock of hair.

[0042] As visible in [Fig.l], the frame 14 comprises for example a handle 22 and a head 24.

[0043] The handle 22 preferably forms a gripping handle of the inspection device 10, the handle then being configured to be held in the hand of a user of the inspection device 10. The handle 22 is for example elongated and defines a gripping axis P-P' of the frame 14.

[0044] The head 24 extends in the extension of the handle 22. The head 24 is for example intended to be affixed to a portion of the human body to be inspected. The head 24 is for example elongated and defines an observation axis O-O' of the frame 14. The frame 24 thus extends at least partially along the observation axis O-O'. In the variant presented in FIGS. 1 and 2, the observation axis O-O' is substantially perpendicular to the gripping axis P-P'.

[0045] The frame 14 defines an observation window 26 of a portion of the human body. The observation window 26 is for example defined by the head 24 of the frame. The observation window 26 is intended to be arranged opposite the portion of the human body. 12 to inspect.

[0046] The observation window 26 is for example arranged along the observation axis O-O', the observation axis 0-0' passing through the observation window 26, preferably through the center of the observation window 26.

[0047] As visible in [Fig.l], the observation window 26 is for example substantially flat and defines a window plane F.

[0048] In the example of [Fig.l], the observation window is rectangular. The observation window is for example elongated in a direction perpendicular to the gripping axis P-P'.

[0049] As illustrated in [Fig.l], the frame comprises for example an observation window 28 housed in the observation window 26.

[0050] The optical sensor 16 is configured to capture a measurement light radiation C. The optical sensor comprises, for example, or is formed by, a camera.

[0051] The measuring light radiation C is a light radiation coming from the portion of the human body 12. The measuring radiation C passes for example through the observation window 26 before reaching the optical sensor 16. The measuring radiation C is then for example parallel to the observation axis O-O'.

[0052] The optical sensor 16 is then, for example, arranged on the observation axis O-O'.

[0053] The optical sensor 16 is then configured to, from the measurement radiation C captured, evaluate a parameter specific to the portion of the human body 12.

[0054] The illumination arrangement 18 is configured to illuminate the human body portion 12, in particular so that the human body portion 12 emits the measurement light radiation C, for example by reflection of the light emitted by the illumination arrangement 18.

[0055] The illumination arrangement 18 comprises at least one light source 30 and a concave mirror 32.

[0056] The illumination arrangement 18 comprises, for example, between four and twelve light sources 30. In the example of [Fig. 2], the illumination arrangement 18 comprises eight light sources 30. In certain variants, the illumination arrangement 18 comprises more than twelve light sources 30.

[0057] When the device 10 comprises at least two light sources 30, each light source is for example arranged radially at the same non-zero distance from the observation axis.

[0058] When the device 10 comprises at least two light sources 30, the light sources are for example symmetrical along at least one plane of symmetry S.

[0059] The at least one plane of symmetry S comprises for example the observation axis O-O'.

[0060] When the device 10 comprises at least four light sources, the orthoradial distance between two light sources 30 of two pairs of light sources 30 adjacent is greater than the orthoradial distance of the other pairs of adjacent light sources 30 (not shown). At least one plane of symmetry S then extends, for example, between the two light sources 30 of the two pairs of adjacent light sources 30 whose orthoradial distance is greater than the orthoradial distance of the other pairs of adjacent light sources 30.

[0061] The light sources are then divided into two distinct groups of light sources, for example arranged on either side of the plane of symmetry S.

[0062] By way of example, in a variant in which the device comprises at least six light sources, the orthoradial spacing between two light sources of two pairs of adjacent light sources 30 is for example equal to 90° while the orthoradial spacing between the other pairs of adjacent light sources is for example equal to 45°. One of the planes of symmetry S then extends for example between the two light sources 30 of the two pairs of adjacent light sources 30 whose orthoradial spacing is greater than the orthoradial spacing of the other pairs of adjacent light sources 30.

[0063] Each light source 30 is configured to produce an emitted light radiation A.

[0064] The emitted light radiation A produced by the or each light source 30 diverges from said at least one light source 30. In other words, the rays emitted by each light source 30 are not collimated and diverge from the light source 30 from which they were emitted.

[0065] Each light source 30 is for example a light-emitting diode, also known as a LED (light-emitting diode). In particular, each light source 30 is for example a white diode and more particularly a diode with a high color rendering index.

[0066] The color rendering index of the light sources 30 is for example greater than 90.

[0067] In a particular embodiment (not shown), at least one of the light sources 30 comprises a light-emitting diode as previously described and additionally comprises a converging lens. The converging lens then reduces in this variant the divergence of the light radiation emitted by the light-emitting diode, the emitted light ray A produced by such a light source 30 thus being less divergent than the light ray which would have been emitted by a light-emitting diode alone.

[0068] The control module 20 is configured to control the or each light source 30. The control module 20 is for example connected to a power supply (not shown) and is configured to switch the at least one light source 30 between an on state, in which the light source 30 emits radiation emitted light A, and an off state in which the light source does not emit emitted light radiation A.

[0069] The control module 20 is for example, in addition, configured to control the intensity of the emitted light radiation A produced by the at least one light source 30 and / or the color, or in other words the wavelength, of the emitted light radiation A produced by the at least one light source 30.

[0070] The control module 20 is for example configured to control the polarization of the emitted light radiation A produced by the at least one light source 30.

[0071] The control module 20 is furthermore, for example, configured to control the general direction of the emitted light radiation A produced by the at least one light source 30.

[0072] The device 10 comprises for example a control member (not shown) forming a human-machine interface, the control member being configured to control the command member.

[0073] When the device 10 comprises at least two light sources 30, the control module 20 is configured to control each light source 30 independently of one another.

[0074] The concave mirror 32 is configured to reflect the emitted light radiation A produced by at least one of the light sources 10 into reflected radiation B.

[0075] By concave, it is meant that the mirror is hollow on its reflecting face, that is to say that a straight line tangent to the mirror extends on the side of the mirror opposite the reflecting face of the mirror. Thus, the term concave mirror 32 does not only designate a mirror of constant concavity, the concavity of the concave mirror 32 being for example variable.

[0076] The concave mirror 32 preferably defines at least one optical convergence region. In particular, the optical convergence region corresponds to a region of convergence of collimated light rays if the collimated light rays are emitted from the observation window 26 towards the concave mirror 32. The at least one optical convergence region is then comparable to an optical focus of the concave mirror 32 and can therefore be described as a pseudo-optical focus.

[0077] The or each light source 30 is then arranged at the or one of the optical focus(es), so that the emitted light radiation A produced by the light source 30 that the concave mirror 32 reflects, is reflected into reflected light radiation B collimated towards the observation window 26.

[0078] The concave mirror 32 is then comparable to a pseudo-parabolic mirror. The concave mirror 32 is for example formed by a pseudo-parabolic mirror of revolution or by a portion of a pseudo-parabolic mirror of revolution. By pseudo-parabolic, it is meant here that the general shape of the concave mirror 32 seen in section along a plane passing through the observation axis O-O', as illustrated in [Fig.3], is of a shape similar to a parabola, that is to say a curve defined by a second-degree polynomial function. However, as visible in [Fig.3], and for each given angular section around the axis 0-0', the concave mirror 32 defines a different optical focus, said optical foci together defining the optical convergence region. Therefore, the concave mirror, even if it can be assimilated to a parabolic mirror, is generally not strictly parabolic.

[0079] The geometry of the concave mirror 32 is for example obtained following numerical simulations. The geometry of the concave mirror is for example obtained following an iterative numerical simulation taking into account the relative position of the at least one light source 30, the concave mirror 32 and the observation window 26, the observation window making it possible to determine the position of the portion of the human body 12.

[0080] During the iterative digital simulation aimed at obtaining the geometry of the concave mirror 32, the geometry of a model of the concave mirror is iteratively modified until the light rays emitted from a model of the at least one light source 30 pass through a model of the observation window while being collimated so as to illuminate a model of the portion of the human body 12. In other words, the geometry of the model of the concave mirror is iteratively modified until the geometry of the concave mirror 32 allows the collimation of the light rays through the observation window so as to illuminate the portion of the human body 12 using collimated light rays.

[0081] During the iterative numerical simulation, the concavity of the concave mirror 32 is more particularly calculated so that the concave mirror 32 allows the collimation of the light rays through the observation window 26. In particular variants not illustrated, the mirror 32 comprises for example locally a convex region, the term concave thus having to be understood as generally concave.

[0082] The emitted light radiation A, diverging from a given light source 30 is collimated by the concave mirror 32, forming the reflected light radiation B.

[0083] By collimated, it is meant that the rays forming the reflected light radiation B extend substantially parallel to each other up to the observation window 26. It is thus meant that the angle formed between any two rays of the collimated reflected radiation B is less than 5° and preferably less than 2°. It will be understood here that only the portion of the emitted radiation A reflected by the concave mirror 32, and forming the reflected light radiation B, is collimated.

[0084] The length of the reflected light radiation B, that is to say the length of the light radiation extending between the concave mirror 32 and the portion of the human body 12, is preferably between 20 mm and 60 mm, more preferably between 30 and 40 mm. In other words, the vertical distance, that is to say along the axis observation point O-O', between the point where the emitted light ray A is reflected into the reflected radiation B, and the portion of the human body 12, is between 15mm and 45mm, and preferably between 20mm and 35mm.

[0085] The reflected light radiation B is collimated towards the observation window 26 so as to illuminate the portion of the human body 12, when the portion of the human body 12 is arranged opposite the observation window 26. The reflected light radiation B is in particular intended to pass through the observation window 26. The reflected light radiation B thus collimated is for example intended to be reflected by the portion of the human body 12, the light radiation thus reflected by the portion of the human body 12 forming for example the measurement radiation C.

[0086] The reflected light radiation B passes through, for example, the window plane F at an angle of between 30° and 60°, preferably between 40° and 50° and more preferably between 42° and 48°, relative to the window plane F. In the example of [Fig. 3], the reflected light radiation B passes through the window plane F at an angle of 45° relative to the window plane F.

[0087] The measuring radiation C passes through, for example, the window plane F at an angle of between 85° and 95° relative to the window plane F, and preferably at an angle equal to 90° relative to the window plane.

[0088] Thus, as visible in [Fig. 3], the portion of human body 12 is illuminated by means of the reflected light radiation B passing through the observation window 26 while being inclined relative to the window plane F, the optical sensor 16 capturing the measurement radiation C vertically above the portion of human body 12.

[0089] The illumination arrangement 18 preferably comprises a single concave mirror 32, as illustrated in [Fig.2]. The single concave mirror 32 is then configured to reflect the emitted light radiation A, produced by the or each light source 30, into a reflected light radiation B.

[0090] In a variant not shown, the illumination arrangement 18 comprises a plurality of concave mirrors 32. Each concave mirror 32 is for example arranged opposite a light source 30 so as to reflect the emitted light radiation A produced by said light source into reflected light radiation B. As seen above, the geometry of these concave mirrors 32 is calculated so that the concave mirror 32 allows the collimation of the light rays through the observation window 26. Such concave mirrors 32 are for example independent of each other. Alternatively, the concave mirrors 32 are linked to each other by a connecting mirror (not shown).The concave mirrors are then comparable to concave regions of a mirror formed by said concave mirrors and by the connecting mirror, the geometry of such a mirror being, as seen above, adapted to allow the collimation of the light radiation B reflected through the window. observation 26.

[0091] In the embodiment of [Fig.2], the concave mirror 32 is a mirror of revolution around the observation axis O-O'.

[0092] The or each concave mirror 32 comprises at least one proximal edge 34 and at least one distal edge 36. The proximal edge 34 is radially wider than the distal edge 36.

[0093] The distal edge 36 extends for example in a plane, for example in a plane substantially parallel to the observation window 26. When the concave mirror 32 is a mirror of revolution around the observation axis O-O', the distal edge 36 is for example circular in a plane substantially parallel to the observation window 26. When 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.

[0094] The distal edge 36 is preferably proximally offset from the observation window 26 by a distance of between 0 mm and 50 mm and preferably between 10 and 30 mm, the distance preferably being measured perpendicular to the plane formed by the observation window 26. In other words, the observation window 26 is offset along the observation axis O-O', in the direction of the human body portion 12, by a distance of between 5 mm and 50 mm and preferably between 10 and 30 mm.

[0095] In a particular variant illustrated in [Fig.3], the device 10 comprises an inner window 40. The inner window 40 is housed in abutment on the distal edge 36 of the mirror 32, the inner window 40 then extending for example substantially in the plane formed by the distal edge 36.

[0096] A method for inspecting a portion of the human body 12 implemented by means of an inspection device 10 as previously described will now be presented.

[0097] A portion of the human body is first presented opposite the observation window 26 of the frame 14. For example, a lock of hair is presented opposite said observation window 26. The portion of the human body 12 is then preferably aligned on the observation axis O-O'.

[0098] The emitted light radiation A is then produced by the at least one light source 30. Each source 30 produces, for example, emitted light radiation.

[0099] The emitted light radiation A is then reflected by the concave mirror 32. The reflected light ray B thus obtained by the reflection of the emitted light ray A on the concave mirror 32 is collimated towards the observation window 26. In other words, the reflection of the emitted light radiation A on the concave mirror 32 collimates said emitted light ray A into a reflected light radiation B towards the observation window 26.

[0100] The reflected radiation B is then reflected by the portion of the human body 12. The radiation resulting from the reflection of the reflected radiation B on the portion of the human body 12 forms a measurement light radiation C, the measurement light radiation C making it possible to characterize the portion of the human body 12.

[0101] The measurement radiation C coming from the human body portion is then captured by the optical sensor 16. The optical sensor 16 and / or a processing module (not shown) are then configured to determine the visual properties of the human body portion 12 from the measurement radiation C, and determine the characteristics associated with such properties.

[0102] A method of manufacturing a device 10 for inspecting a portion of the human body 12 as previously described will now be presented.

[0103] The manufacturing method comprises a step of providing a model of a device for inspecting a portion of the human body 12 that is not adapted, followed by a step of adapting the model and more particularly the modeling of the concave mirror 32, followed by a step of manufacturing the device on the basis of the adapted model.

[0104] During the providing step, the modeling of the device 10 for inspecting a portion of the human body 12 is provided that is not adapted. Each light source 30 of the modeling is configured to produce a modeling of emitted light radiation A. The at least one concave mirror 32 of the modeling is configured to reflect the modeling of the emitted light radiation A into a modeling of reflected light radiation B. The modeling of reflected light radiation is reflected towards the modeling of the observation window 26 without being collimated. In other words, the modeling of the device 10 for inspecting a portion of the human body 12 is not adapted in that the geometry of the at least one concave mirror 32 of the modeling does not make it possible to obtain a collimated modeling of reflected light radiation B.

[0105] During the adaptation step, the geometry of the at least one concave mirror 32 of the modeling is adapted so that the modeling of reflected light radiation B is collimated by the modeling of the concave mirror 32 towards the modeling of the observation window 26. The adaptation step comprises for example an iterative calculation of a modified geometry of the at least one concave mirror 32 of the modeling, a new modified geometry of the at least one concave mirror 32 being calculated until a concave mirror geometry 32 adapted so that the reflected light radiation B is collimated is obtained.

[0106] During the manufacturing step, the device 10 for inspecting a portion of the human body is manufactured on the basis of the adapted geometry of the modeling of said device 10 and more particularly on the basis of the adapted geometry of the at least a concave mirror 32 of the modeling. In particular, the concavity of the concave mirror 32 corresponds to the concavity of the adapted concave mirror 32 modeling.

[0107] The inclination of the reflected radiation B relative to the plane F of the observation window is particularly interesting for improving the illumination of the portion of the human body 12, such illumination limiting, for example, undesirable reflections on the portion of the human body 12.

[0108] The use of a control module is particularly advantageous for adapting the use of the inspection device to different contexts of use.

[0109] The use of a number of light sources 30 between four and twelve light sources allows illumination by collimated emitted light rays A coming from several different orientations, which makes it possible to improve the precision of the device.

[0110] The particular orthoradial positioning of the light sources as described above also makes it possible to obtain lighting that is particularly suitable for elongated objects such as locks of hair, by limiting the specular reflection associated with such elongated objects.

[0111] The use of a single concave mirror allows for particularly simple mounting and particularly economical construction of the inspection device 10.

[0112] The use of light-emitting diodes is furthermore particularly relevant for limiting the manufacturing cost while having a light source 30 whose properties of the emitted light radiation A are adapted to their use in an inspection device 10.

[0113] Those skilled in the art will understand that the previously described embodiments and variations may be combined to form new embodiments provided that they are technically compatible.

Claims

Claims

1. Device (10) for inspecting a portion of the human body (12), comprising: - a frame (14), defining an observation window (26) of the portion of the human body (12);- an optical sensor (16), configured to capture a measurement light radiation (C) coming from the human body portion (12), and - an illumination arrangement (18), configured to illuminate the human body portion (12), the illumination arrangement (18) comprising at least one light source (30), each light source (30) being configured to produce an emitted light radiation (A), characterized in that the illumination arrangement (18) comprises at least one concave mirror (32), the at least one concave mirror (32) being configured to reflect the emitted light radiation (A) produced by at least one of the light sources (30) into a reflected light radiation (B), the reflected light radiation (B) being collimated towards the observation window (26) so as to illuminate the human body portion (12).;

2. An inspection device (10) according to claim 1, wherein the at least one concave mirror defines at least one optical convergence region, the or each light source (30) being arranged in the or one of the optical convergence regions.

3. Inspection device (10) according to claim 1 or 2, wherein the observation window (26) defines a window plane (F), the reflected light radiation (B) passing through the window plane (F) at an angle of between 30° and 60°, preferably between 40° and 50° and more preferably between 42° and 48°, relative to the window plane (F).

4. Device according to any one of the preceding claims, in which the frame (14) extends along an observation axis (O-O'), the optical sensor (16) being arranged on the observation axis (O-O'), the measuring light radiation (C) being parallel to the observation axis.

5. Inspection device (10) according to any one of the claims previous, wherein the device (10) comprises a control module (20) configured to control the or each light source (30).

6. An inspection device (10) according to any preceding claim, wherein the illumination arrangement (18) comprises between four and twelve light sources (30).

7. Inspection device (10) according to any one of the preceding claims, wherein the device (10) comprises at least two light sources (30), the frame (14) extending along an observation axis (O-O'), the observation axis (O-O') passing through the observation window (26), each light source (30) being radially at the same non-zero distance from the observation axis (O-O').

8. Inspection device (10) according to claim 7, wherein the device (10) comprises at least four light sources (30), the orthoradial distance between two light sources (30) of two pairs of adjacent light sources (30) being greater than the orthoradial distance of the other pairs of adjacent light sources (30), the light sources (30) being symmetrical along a plane of symmetry (S) comprising the observation axis (O-O').

9. An inspection device (10) according to any preceding claim, wherein the at least one concave mirror (32) is the only concave mirror (32) of the illumination arrangement (18), the concave mirror (32) being a mirror of revolution and being configured to reflect the emitted light radiation (A) produced by the or each light source into reflected light radiation (B).

10. An inspection device (10) according to any preceding claim, wherein each light source (30) is a light-emitting diode.

11. An inspection device (10) according to any preceding claim, wherein the at least one concave mirror (32) comprises a distal edge (36), the distal edge (36) being proximally offset from the viewing window (28) by a distance of between 0 mm and 50

12. mm. Inspection device (10) according to claim 11, wherein the device (10) comprises an inner window (40) housed in abutment on the distal edge (36) of the mirror (32).

13. Method for inspecting a portion of human body (12) implemented by means of an inspection device (10) according to any one of the claims 1 to 12, the method comprising the following steps: - placing the portion of the human body (12) opposite the observation window (26) of the frame (14), - production of light radiation emitted (A) by the at least one light source (30); - reflection of the emitted light ray (A) by the at least one concave mirror (32), the reflected light radiation (B) being collimated towards the observation window (26); - reflection of the reflected light ray (B) by the portion of human body (12), the ray reflected by the portion of human body (12) forming a measuring light radiation (C); and - capture of the measuring radiation (C) coming from the portion of the human body (12) by the optical sensor (16) of the inspection device (10).

14. A method of manufacturing a device (10) for inspecting a portion of a human body (12) according to any one of claims 1 to 12, the manufacturing method comprising the following steps: - providing a model of a device for inspecting a portion of the human body (12) that is not adapted, each light source (30) of the model being configured to produce a model of emitted light radiation (A), the at least one concave mirror (32) of the model being configured to reflect the model of the emitted light radiation (A) into a model of reflected light radiation (B), the model of reflected light radiation being reflected towards the model of the observation window (26) without being collimated; - adaptation of the geometry of the at least one concave mirror (32) of the modeling, so that the modeling of reflected light radiation (B) is collimated by the modeling of the concave mirror towards the modeling of the observation window (26); and - manufacturing the device for inspecting a portion of the human body (12), said device comprising at least one concave mirror (32) manufactured on the basis of the adapted geometry of the at least one concave mirror (32) of the modeling.

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