DISPOSITIF D'ECLAIRAGE FRONTAL PERMETTANT O'OBSERVER DES CAVITES
ETROITES ET PROFONDES
L'invention concerne un dispositif d'éclairage frontal portatif pouvant être fixé à la tête de l'utilisateur et permettant d'observer à courte distance des cavités étroites et profondes en fournissant un faisceau de rayons lumineux sensiblement parallèles et une tache de lumière intense, notamment pour examens médicaux.FRONTAL LIGHTING DEVICE FOR OBSERVING CAVITIES
NARROW AND DEEP
The invention relates to a portable front lighting device which can be fixed to the head of the user and makes it possible to observe narrow and deep cavities at a short distance by providing a beam of substantially parallel light rays and a spot of intense light, especially for medical examinations.
On connaît déjà de tels dispositifs d'éclairage. On connaît en particulier du brevet français N' 1 304 682, un dispositif d'éclairage qui comporte un miroir concave de faible courbure couvrant substantiellement la partie supérieure du nez, les dimensions transversales étant telles que le champ visuel n'est pas limité ni en hauteur ni latéralement, une source lumineuse mobile étant disposée devant le miroir. La position de la source lumineuse est-décalée en hauteur par rapport à l'axe du miroir. Le problème posé par de tels dispositifs réside dans le fait que l'ampoule étant disposée devant le miroir pertube le faisceau lumineux réfléchi, l'ombre de l'ampoule étant en général projetée. La tache lumineuse n'est donc pas parfaitement symétrique ni d'intensité régulière. De plus, le miroir étant d'une faible courbure, la puissance lumineuse projetée est faible.Such lighting devices are already known. We know in particular from French patent N 1 304 682, a lighting device which comprises a concave mirror of small curvature covering substantially the upper part of the nose, the transverse dimensions being such that the visual field is not limited nor in height or laterally, a mobile light source being disposed in front of the mirror. The position of the light source is offset in height relative to the axis of the mirror. The problem posed by such devices lies in the fact that the bulb being arranged in front of the mirror disturbs the reflected light beam, the shadow of the bulb being generally projected. The light spot is therefore not perfectly symmetrical or of regular intensity. In addition, the mirror being of a small curvature, the projected light power is low.
On connaît également d'autres dispositifs d'éclairage similaires pour lesquels on cherchait à obtenir une tâche lumineuse aussi étroite que possible afin d'obtenir une intensité maximale en fonction des dimensions de la cavité à observer. Mais celà nécessite une plage de réglages. importante de la taille de la tâche lumineuse au détriment de son homogénéité et de son intensité. Dans tous les dispositifs antérieurs à miroir on constate des aberrations sur la tâche lumineuse et la puissance projetée n'est pas suffisante.Other similar lighting devices are also known for which it was sought to obtain a light task as narrow as possible in order to obtain a maximum intensity as a function of the dimensions of the cavity to be observed. But this requires a range of settings. significant size of the light spot at the expense of its homogeneity and intensity. In all prior mirror devices, there are aberrations in the light spot and the projected power is not sufficient.
L'invention vise à remédier aux inconvénients pré-cités des dispositifs d'éclairage connus, et propose un tel dispositif qui fournisse une tâche lumineuse intense et d'intensité parfaitement régulière et homogène, sur une surface de diamètre de l'ordre de 5cm pour une' distance d'observation de 25cm à 50cm, l'ombre de la source lumineuse n'étant pas projetée, et ce avec un faisceau de lumière
Un autre objet de l'invention est de procurer un tel dispositif d'éclairage fournissant une tache de lumière plus intense que les dispositifs de l'art antérieur. Un autre objet de l'invention est de procurer un tel dispositif qui soit de plus simple à utiliser, léger, facilement transportable et de faible prix de revient.The invention aims to remedy the aforementioned drawbacks of known lighting devices, and proposes such a device which provides an intense light task and of perfectly regular and homogeneous intensity, on a surface of diameter of the order of 5 cm for an observation distance of 25cm to 50cm, the shadow of the light source not being projected, and this with a beam of light
Another object of the invention is to provide such a lighting device providing a spot of more intense light than the devices of the prior art. Another object of the invention is to provide such a device which is more simple to use, light, easily transportable and of low cost price.
Pour ce faire, l'invention propose un dispositif d'éclairage frontal portatif pouvant être fixé à la tête de l'utilisateur et permettant d'observer à courte distance des cavités étroites et profondes en fournissant un faisceau. de rayons lumineux sensiblement parallèles et une tache de lumière intense et homogène -notamment de diamètre de l'ordre de 5cm pour une distance d'observation de 25 à 50cm-, du type comportant un miroir concave solidaire d'un support de miroir associé à un dispositif de fixation de l'ensemble sur la tête de l'utilisateur une source lumineuse placée en regard de la face réfléchissante du miroir des des moyens de réglage de la distance séparant la source lumineuse du miroir ; la position et les dimensions du miroir étant telles que le miroir recouvre substantiellement la partie supérieure du nez pour une observation binoculaire, le faisceau de lumière réfléchie étant orienté selon l'axe visuel, caractérisé en ce que le miroir est un miroir concave symétrique autour d'un grand axe et ayant un rayon de courbure moyen inférieur à 30mm -notamment de l'ordre de 27mm- pour une dimension transversale maximale de l'ordre de 30mm, et en ce que la source lumineuse est placée sur le grand axe optique du miroir. Les moyens de réglage de la distance séparant la source du miroir permettent de placer cette source lumineuse sur le grand axe du miroir à une distance d du sommet S du miroir inférieure à 15mm -notamment de l'ordre de 13,5mm-. De préférence, le miroir est sphérique et son demi-angle d'ouverture est supérieur à 30'.To do this, the invention provides a portable front lighting device which can be fixed to the head of the user and makes it possible to observe narrow and deep cavities at a short distance by providing a beam. of substantially parallel rays of light and a spot of intense and homogeneous light - in particular of diameter of the order of 5 cm for an observation distance of 25 to 50 cm -, of the type comprising a concave mirror secured to a mirror support associated with a device for fixing the assembly on the head of the user a light source placed opposite the reflecting face of the mirror means for adjusting the distance separating the light source from the mirror; the position and dimensions of the mirror being such that the mirror substantially covers the upper part of the nose for binocular observation, the beam of reflected light being oriented along the visual axis, characterized in that the mirror is a concave mirror symmetrical around d '' a major axis and having an average radius of curvature less than 30mm - notably of the order of 27mm - for a maximum transverse dimension of the order of 30mm, and in that the light source is placed on the major optical axis of the mirror. The means for adjusting the distance separating the source from the mirror make it possible to place this light source on the long axis of the mirror at a distance d from the apex S of the mirror of less than 15mm -in particular of the order of 13.5mm-. Preferably, the mirror is spherical and its half-opening angle is greater than 30 '.
L'inventeur a constaté qu'avec de telles dispositions, on obtient de façon surprenante une tache lumineuse extrêmement intense, homogène, et dont le diamètre est de l'ordre de 5cm à une distance de projection comprise entre 25 et 50cm. Par ailleurs, les faisceaux lumineux étant sensiblement parallèles, l'observation peut être faite à plus grande distance sans inconvénient, et des cavités très étroites et très profondes peuvent être éclairées. Contrairement à ce qui était prévu dans l'art antérieur, l'inventeur a montré que le fait que les dimensions de la tâche lumineuse soient supérieures à celles de la cavité à observer né nuit pas l'observation, dès lors que la puissance lumineuse est suffisante. il n'est donc pas nécessaire de prévoir une large plage de focalisation.The inventor has found that, with such arrangements, an extremely intense, homogeneous light spot is obtained, surprisingly, and whose diameter is of the order of 5 cm at a projection distance between 25 and 50 cm. Furthermore, the light beams being substantially parallel, the observation can be made at greater distance without inconvenience, and very narrow and very deep cavities can be illuminated. Contrary to what was provided in the prior art, the inventor has shown that the fact that the dimensions of the light spot are greater than those of the cavity to be observed is not detrimental to the observation, since the light power is sufficient. it is therefore not necessary to provide a wide focusing range.
D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description suivante qui se réfère aux figures annexées dans lesquelles
La figure 1 est une vue schématique en perspective d'un dispositif
selon l'invention, , .La figure 2 est une vue latérale du même dispositif monté sur la
tête d'un observateur.Other characteristics and advantages of the invention will appear on reading the following description which refers to the appended figures in which
Figure 1 is a schematic perspective view of a device
according to the invention,,. Figure 2 is a side view of the same device mounted on the
head of an observer.
L'invention concerne un dispositif d'éclairage frontal portatif pouvant être fixé à la tête de l'utilisateur et permettant d'observer à courte.distance des cavités étroites et profondes en fournissant un faisceau de rayons lumineux sensiblement parallèles et formant une tache de lumière intense et homogène -notamment de diamètre de l'ordre de 5cm pour une distance d'observation de 25 à 50cm- r du type comportant un miroir concave 1 solidaire d'un support de miroir 2 associé à un dispositif de fixation 3 de l'ensemble sur la tête de l'utilisateur. Ce dispositif de fixation 3 peut par exemple être constitué d'un bandeau de tête. Une source lumineuse 4 est placée en regard de la face réfléchissante du miroir 1, elle-même orientée vers l'avant. Des moyens 5 de réglage de la distance d séparant la source lumineuse 4 du miroir 1 sont prévus. La position et les dimensions du miroir 1 sont telles que ce miroir 1 recouvre substantiellement la partie supérieure du nez de l'utilisateur pour une observation binoculaire, le faisceau de lumière réfléchie étant orienté selon l'axe visuel de l'utilisateur.The invention relates to a portable front lighting device which can be fixed to the head of the user and which makes it possible to observe narrow and deep cavities at short distance by providing a beam of light rays which are substantially parallel and form a spot of light. intense and homogeneous - in particular of a diameter of the order of 5 cm for an observation distance of 25 to 50 cm - of the type comprising a concave mirror 1 secured to a mirror support 2 associated with a fixing device 3 of the together on the user's head. This fixing device 3 can for example consist of a headband. A light source 4 is placed opposite the reflecting face of the mirror 1, itself oriented towards the front. Means 5 for adjusting the distance d separating the light source 4 from the mirror 1 are provided. The position and dimensions of the mirror 1 are such that this mirror 1 substantially covers the upper part of the user's nose for binocular observation, the beam of reflected light being oriented along the user's visual axis.
Selon l'invention, le miroir 1 est un miroir concave symétrique autour d'un grand axe 6 et ce miroir 1 a un rayon de courbure moyen inférieur à 30mm -notamment de l'ordre de 27mm- pour une direction transversale maximale de l'ordre de 30mm et la source lumineuse 4 est placée sur le grand axe optique 6 du miroir 1. De plus, les moyens 5 de réglage de la distance d séparant la source lumineuse 4 du miroir 1 permettent de placer cette source lumineuse 4 sur le grand axe 6 du miroir 1 à une distance d du sommet S du miroir 1 inférieure à 1Smm -notamment de l'ordre de 13,5mm-.According to the invention, the mirror 1 is a concave mirror symmetrical about a major axis 6 and this mirror 1 has an average radius of curvature less than 30mm - in particular of the order of 27mm - for a maximum transverse direction of the order of 30mm and the light source 4 is placed on the long optical axis 6 of the mirror 1. In addition, the means 5 for adjusting the distance d separating the light source 4 from the mirror 1 allow this light source 4 to be placed on the large axis 6 of mirror 1 at a distance d from the vertex S of mirror 1 less than 1 mm - in particular of the order of 13.5 mm -.
De préférence, le miroir 1 est un miroir sphérique concave dont le plus grand diamètre est de l'ordre de 30mm, et dont le rayon de courbure est de l'ordre de 27mm. Le demi-angle d'ouverture a (entre le grand axe 6 et la droite joignant le bord extrême 7 du miroir 1 et son centre de courbure C) d'un miroir 1 selon l'invention est supérieur à 30 -notamment de l'ordre de 35' plus ou moins 3'-.Preferably, the mirror 1 is a concave spherical mirror whose largest diameter is of the order of 30mm, and whose radius of curvature is of the order of 27mm. The half-angle of opening a (between the major axis 6 and the straight line joining the extreme edge 7 of the mirror 1 and its center of curvature C) of a mirror 1 according to the invention is greater than 30, in particular the order of 35 'plus or minus 3'-.
La source lumineuse 4 est avantageusement constituée du filament 8 d'une ampoule dont le culot 9 est tourné vers l'avant et a un diamètre inférieur à 15mm -notamment de l'ordre de IOmm-. Le bord avant 10 du culot 9 est placé de préférence à environ IOmm du filament 8 de l'ampoule. Le filament 8 a une longueur comprise de préférence entre 1 et 5mm -notamment de l'ordre de 3mm-.The light source 4 is advantageously made up of the filament 8 of a bulb, the base 9 of which faces forward and has a diameter of less than 15 mm, in particular of the order of 10 mm. The front edge 10 of the base 9 is preferably placed approximately 10 mm from the filament 8 of the bulb. The filament 8 has a length preferably between 1 and 5mm - in particular of the order of 3mm -.
De préférence, l'ampoule est supportée par deux fils conducteurs métalliques rigides 11 qui l'alimentent en électricité et qui sont articulés à deux bornes de connexion 12 solidaires du support de miroir 2, constituant ainsi des moyens de maintien de l'ampoule à la distance d du miroir 1, et les moyens 5 de réglage de la distance d.Preferably, the bulb is supported by two rigid metallic conductive wires 11 which supply it with electricity and which are articulated at two connection terminals 12 integral with the mirror support 2, thus constituting means for holding the bulb at the distance d from the mirror 1, and the means 5 for adjusting the distance d.
Deux fils d'alimentation 13 sont connectées aux bornes 12 pour alimenter l'ampoule en électricité.Two supply wires 13 are connected to terminals 12 to supply electricity to the bulb.
Il est préférable d'allonger au maximum la longueur des conducteurs de support de l'ampoule. Par exemple, la distance entre les bornes de connexion 12 et le grand axe 6 est comprise entre 30 et 50mm -notamment de l'ordre de 40mm-,
L'inventeur a déterminé que les caractéristiques précédentes d'un dispositif selon l'invention permettent de réaliser une tache lumineuse intense et homogène d'environ 5mm de diamètre pour les distances courantes d'observation de 25cm à 50cm. Aucune ombre n'est observée sur la tache lumineuse, du fait des caractéristiques géométriques et optiques du dispositif selon l'invention, et l'intensité lumineuse est très supérieure à celle obtenue avec les dispositifs de l'art antérieur.It is preferable to lengthen the length of the bulb support conductors as much as possible. For example, the distance between the connection terminals 12 and the major axis 6 is between 30 and 50 mm, in particular of the order of 40 mm,
The inventor has determined that the preceding characteristics of a device according to the invention make it possible to produce an intense and homogeneous light spot of approximately 5 mm in diameter for the current observation distances of 25 cm to 50 cm. No shadow is observed on the light spot, due to the geometrical and optical characteristics of the device according to the invention, and the light intensity is much higher than that obtained with the devices of the prior art.
Par ailleurs, le dispositif selon l'invention comporte avantageusement, associées au support de miroir 2, deux lentilles (non représentées) formant loupes qui, en positions déployées sur chaque côté du support de miroir 2, constituent des lunettes grossissantes pour l'utilisateur. De telles lentilles sont avantageusement articulées à la face arrière 15 du support de miroir 2 pour pouvoir être escamotables d'une position escamotée où elles sont disposées verticalement et n'interfèrent pas avec le champ de vision de l'utilisateur, à une position déployée où elles viennent horizontalement en regard des yeux de l'utilisateur.Furthermore, the device according to the invention advantageously comprises, associated with the mirror support 2, two lenses (not shown) forming magnifying glasses which, in deployed positions on each side of the mirror support 2, constitute magnifying glasses for the user. Such lenses are advantageously articulated on the rear face 15 of the mirror support 2 so that they can be retractable from a retracted position where they are arranged vertically and do not interfere with the field of vision of the user, in a deployed position where they come horizontally opposite the user's eyes.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8710412AFR2618211B1 (en) | 1987-07-15 | 1987-07-15 | FRONTAL LIGHTING DEVICE FOR OBSERVING NARROW AND DEEP CAVITIES. |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8710412AFR2618211B1 (en) | 1987-07-15 | 1987-07-15 | FRONTAL LIGHTING DEVICE FOR OBSERVING NARROW AND DEEP CAVITIES. |
| Publication Number | Publication Date |
|---|---|
| FR2618211A1true FR2618211A1 (en) | 1989-01-20 |
| FR2618211B1 FR2618211B1 (en) | 1991-11-15 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR8710412AExpired - LifetimeFR2618211B1 (en) | 1987-07-15 | 1987-07-15 | FRONTAL LIGHTING DEVICE FOR OBSERVING NARROW AND DEEP CAVITIES. |
| Country | Link |
|---|---|
| FR (1) | FR2618211B1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1304682A (en)* | 1961-07-27 | 1962-09-28 | Lighting device for observing narrow and deep cavities | |
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| Date | Code | Title | Description |
|---|---|---|---|
| CL | Concession to grant licences | ||
| ST | Notification of lapse | Effective date:20060331 |