FR2708739A1 - Method and device making it possible to facilitate angular calibration of an apparatus used for adjusting the headlights of a vehicle - Google Patents

Method and device making it possible to facilitate angular calibration of an apparatus used for adjusting the headlights of a vehicle Download PDF

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Publication number
FR2708739A1
FR2708739A1 FR9309642A FR9309642A FR2708739A1 FR 2708739 A1 FR2708739 A1 FR 2708739A1 FR 9309642 A FR9309642 A FR 9309642A FR 9309642 A FR9309642 A FR 9309642A FR 2708739 A1 FR2708739 A1 FR 2708739A1
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Prior art keywords
light
point
headlights
adjusting
screen
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Granted
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FR9309642A
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French (fr)
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FR2708739B1 (en
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Sdika Leon
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Individual
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Individual
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/02Testing optical properties
    • G01M11/06Testing the alignment of vehicle headlight devices

Abstract

The present invention may be produced with a laser or any other light ray which can project a cross or an "S" point onto the light reception screen of the apparatus, orthogonally to the lens and passing through its optical centre. On this screen there is an "H" point which is the origin of the measurements. This laser or light source will be arranged on a mechanical assembly capable of being moved horizontally and vertically. Angular calibration is carried out by moving the light reception screen until the "H" and "S" are superimposed.

Description

PROCEDE ET DISPOSITIF PERMETTANT DE FACILITERMETHOD AND DEVICE FOR FACILITATING

L'ETALONNAGE ANGULAIRE D'UN APPAREILANGULAR CALIBRATION OF A DEVICE

UTILISE POUR LE REGLAGE DES PHARES D'UN VEHICULE
Note : II sera indifféremment utilisé les verbes "étalonner" et "calibrer" pour désigner la même opération.
La présente invention concerne un procédé et un dispositif qui permettent de faciliter l'étalonnage angulaire de tout appareil utilisé pour le contrôle technique ou le réglage des phares automobiles.
On règle aujourd'hui les phares à l'aide de systèmes optiques simples, constitués d'un ensemble monté sur roulettes et qui comprend généralement un boitier optique muni d'une lentille convergente à l'avant et d'un écran récepteur de lumière à l'arrière, généralement localisé au foyer de la lentille (Fig 1).
Les fabricants d'appareils, ainsi que les utilisateurs ne se soucient pas de savoir si leurs appareils utilisés pour le réglage des phares sont étalonnés. Ils ne disposent d'aucun moyen ni instrument pour vérifier leur étalonnage. De plus, aucun service technique spécialisé n'est en mesure de proposer une telle opération.
La présente invention a pour but la mise au point d'un système permettant l'étalonnage de tous les appareils optiques on optoélectronique également appelés "REGLOSCOPES", utilisés pour le réglage des phares. Les erreurs techniques ou déréglages sont généralement dus aux diverses contraintes mécaniques auxquelles sont soumis durant leurs vies, les appareils de réglage et de contrôle des phares.
Le procédé selon la présente invention, qui permet de faciliter et de vérifier l'étalonnage angulaire et mécanique d'un appareil utilisé pour le réglage des phares d'automobiles est tel qu'il consiste à positionner très correctement devant la lentille un système envoyant un faisceau lumineux, laser ou autre, constitué soit d'un point lumineux soit de deux rayons lumineux perpendiculaires passant par ce point, les deux directions étant respectivement parallèle et perpendiculaire au sol de référence.
Pour simplifier, il suffit de se placer dans les conditions d'un sol horizontal, pour que les deux faisceaux soient l'un horizontal, l'autre vertical.
La présente invention peut être réalisée avec un laser ou tout autre système lumineux pouvant projeter une croix ou un point sur l'écran récepteur de lumière (Fig 2 & Fig 3). Ce laser, ou source lumineuse, sera disposé sur un ensemble mécanique (Fig 6). Deux vis (h) et (v) déplacent le faisceau laser ou la source lumineuse respectivement dans le sens horizontal et vertical. Ces deux mouvements sont nécessaires pour agir sur l'orientation du rayon incident de la source lumineuse.
Pour réaliser la présente invention, il est nécessaire. de réaliser l'alignement parfait de l'appareil à régler les phares automobiles avec le dispositif lumineux envoyant une croix ou un point (S) pour éclairer l'écran récepteur de lumière. Ces écrans sont tous pourvus d'un point caractéristique (H) qui constitue l'origine de toutes les mesures.
Il suffit donc que le point lumineux (S) ou l'intersection des axes de la croix lumineuse coïncident avec le point (H) (Fig 3) de l'écran récepteur de lumière pour que l'appareil à régler les phares automobiles soit étalonné.
Si l'écran présente le point (S) comme indiqué sur la Fig 2, l'appareil de réglage de phares n'est pas étalonné.
Selon la présente invention, le positionnement de l'étalon est tel que le faisceau lumineux en croix ou en point incident se superpose avec le rayon réfléchi si l'on dispose d'un miroir parallèle à la lentille devant la lentille (Fig 5). On a alors réalisé la superposition des axes de l'appareil de réglage de phares avec le dispositif envoyant le point ou la croix.
En pratique, il suffit de poser sur l'appareil de réglage de phares une équerre où l'on colle sur l'un de ses côtés un miroir plan. Le parallélisme lentille - miroir est obtenu dès l'instant où le côté de l'équerre ne supportant pas le miroir est posé sur le dessus de l'appareil (Fig 1).
- Si le rayon incident de la somme lumineuse a une direction différente du rayon réfléchi, le positionnement est mauvais, (Fig 4). - Si les rayons incident et réfléchi se confondent, l'alignement est parfait (Fig 5). Une fois obtenue la superposition des rayons incident et réfléchi, on retire l'équerre-miroir pour permettre au rayon lumineux de traverser la lentille et d'arriver sur l'écran.
On procède alors au calibrage en déplaçant l'écran jusqu'à obtenir une superposition des points (H) et (S).
La présente invention sera mieux comprise à l'étude de dispositifs permettant d'étalonner les appareils de réglages de phares automobiles, décrits à l'aide d'exemples non limitatifs et illustrés sur les dessins sur lesquels :
* La figure 1 représente très schématiquement une vue du dispositif de réglage tel qu'il se présente en état de fonctionnement normal devant un phare. Seule l'équerre posée dessus ne fait pas partie de l'appareil original.
* La figure 2 représente le faisceau laser ou autre dispositif lumineux directif, en croix ou en point (H) quand l'appareil à régler les phares n'est pas étalonné correctement. * Lafigure 3 représente le même faisceau que la figure 2, quand l'appareil à régler les phares est étalonné correctement.
* La figure 4 représente un mauvais positionnement de la source lumineuse. * La figure 5 représente un bon positionnement de la source lumineuse. * La figure 6 représente l'ensemble mécanique (table goniométrique) permettant le déplacement du laser ou source lumineuse dans l'horizontal (h) et vertical (v). Dans la technique actuelle, les constructeurs d'appareils de réglage de phares se fient à la seule orthogonalité de la construction mécanique, sans aucune vérification optique possible. Le seul moyen de calibrage existant est constitué par un phare étalon en position de feu de croisement face à un mur situé à 10 mètres. Ce moyen est aléatoire, peu précis et subjectif.Dans la présente invention, l'intersection du faisceau lumineux à deux axes ou le point touchant l'écran au point S permet donc, de déterminer la position vraie du point (H) en le faisant coïncider par des moyens mécaniques par la translation de l'écran récepteur de lumière pour arriver à superposer les points H et S.
USED FOR ADJUSTING THE HEADLIGHTS OF A VEHICLE
Note: The verbs "calibrate" and "calibrate" will be used interchangeably to designate the same operation.
The present invention relates to a method and a device which make it possible to facilitate the angular calibration of any device used for technical inspection or adjustment of automobile headlights.
Headlights are now adjusted using simple optical systems, consisting of an assembly mounted on casters and which generally includes an optical unit provided with a converging lens at the front and a light-receiving screen at the back, usually located at the focal point of the lens (Fig 1).
Device manufacturers, as well as users, don't care whether their devices used for headlight adjustment are calibrated. They have no means or instrument to verify their calibration. In addition, no specialized technical service is able to offer such an operation.
The present invention aims to develop a system for the calibration of all optical devices on optoelectronics also called "REGLOSCOPES", used for adjusting the headlights. Technical errors or misadjustments are generally due to the various mechanical stresses to which the headlight adjustment and control devices are subjected during their lives.
The method according to the present invention, which makes it possible to facilitate and verify the angular and mechanical calibration of a device used for adjusting automobile headlights, is such that it consists in very correctly positioning a system sending in front of the lens. light beam, laser or other, consisting either of a light point or of two perpendicular light rays passing through this point, the two directions being respectively parallel and perpendicular to the reference ground.
To simplify, it is enough to place oneself in the conditions of a horizontal ground, so that the two beams are one horizontal, the other vertical.
The present invention can be implemented with a laser or any other light system capable of projecting a cross or a point on the light receiving screen (Fig 2 & Fig 3). This laser, or light source, will be placed on a mechanical assembly (Fig 6). Two screws (h) and (v) move the laser beam or the light source respectively in the horizontal and vertical direction. These two movements are necessary to act on the orientation of the incident ray of the light source.
To carry out the present invention, it is necessary. to achieve perfect alignment of the device for adjusting automobile headlights with the light device sending a cross or a point (S) to illuminate the light-receiving screen. These screens are all provided with a characteristic point (H) which constitutes the origin of all the measurements.
It is therefore sufficient that the light point (S) or the intersection of the axes of the light cross coincide with the point (H) (Fig 3) of the light receiving screen for the device to adjust the car headlights to be calibrated .
If the screen shows point (S) as shown in Fig 2, the headlight adjustment device is not calibrated.
According to the present invention, the positioning of the standard is such that the light beam in cross or in incident point is superimposed with the reflected ray if there is a mirror parallel to the lens in front of the lens (Fig 5). The axes of the headlight adjustment device were then superimposed with the device sending the point or the cross.
In practice, it suffices to place on the headlight adjustment device a square where a flat mirror is glued on one of its sides. The lens-mirror parallelism is obtained from the moment when the side of the bracket that does not support the mirror is placed on the top of the device (Fig 1).
- If the incident ray of the light sum has a direction different from the reflected ray, the positioning is bad, (Fig 4). - If the incident and reflected rays merge, the alignment is perfect (Fig 5). Once the incident and reflected rays have been superimposed, the mirror square is removed to allow the light ray to pass through the lens and reach the screen.
Calibration is then carried out by moving the screen until the points (H) and (S) are superimposed.
The present invention will be better understood from the study of devices making it possible to calibrate the headlight adjustment apparatuses, described with the aid of nonlimiting examples and illustrated in the drawings in which:
* Figure 1 very schematically shows a view of the adjustment device as it appears in normal operating state in front of a headlight. Only the bracket placed on it is not part of the original device.
* Figure 2 shows the laser beam or other directional light device, cross or point (H) when the device to adjust the headlights is not calibrated correctly. * Figure 3 shows the same beam as Figure 2, when the headlight adjustment device is calibrated correctly.
* Figure 4 represents a bad positioning of the light source. * Figure 5 shows a good positioning of the light source. * Figure 6 represents the mechanical assembly (goniometric table) allowing the movement of the laser or light source in the horizontal (h) and vertical (v). In the current technology, manufacturers of headlight adjustment devices rely solely on the orthogonality of mechanical engineering, without any possible optical verification. The only existing means of calibration consists of a standard lighthouse in the low beam position facing a wall located 10 meters away. This means is random, imprecise and subjective. In the present invention, the intersection of the two-axis light beam or the point touching the screen at point S therefore makes it possible to determine the true position of point (H) by doing so. coincide by mechanical means by the translation of the light receiving screen to arrive at superimposing the points H and S.

REVENDICATIONS
1)_ Procédé permettant de faciliter l'étalonnage angulaire de tout appareil de réglage ou contrôle de phares, caractérisé en ce qu'il comporte une source lumineuse en général et laser en particulier qui traverse l'appareil de réglage au centre de sa lentille et qui se projette sur son écran récepteur de lumière, et dont l'impact par rapport à un point " H " origine des mesures de cet écran récepteur de lumière, détermine la valeur de l'erreur de l'étalonnage de l'appareil, et la translation à faire subir à l'écran pour obtenir la superposition de "H" et de l'impact lumineux "S", de façon à étalonner le dit appareil de réglage et contrôle de phares.
2)_ Dispositif permettant de faciliter l'étalonnage angulaire de tout appareil de réglage ou de contrôle de phares, spécialement conçu pour la mise en oeuvre du procédé conforme 1) _ A process for facilitating the angular calibration of any adjustment or control device for headlights, characterized in that it comprises a light source in general and a laser in particular which passes through the adjustment device at the center of its lens and which is projected onto its light receiving screen, and whose impact with respect to a point "H" originates from the measurements of this light receiving screen, determines the value of the calibration error of the device, and the translation to be subjected to the screen to obtain the superimposition of "H" and the light impact "S", so as to calibrate the said headlight adjustment and control device.
2) _ Device to facilitate the angular calibration of any headlight adjustment or control device, specially designed for implementing the conforming process

Claims (1)

à la revendication 1, caractérisé en ce qu'il comporte un rayon lumineux émis par une source positionnée sur un support à deux degrés de liberté de mouvement : l'un qui produit un balayage vertical du faisceau, l'autre un balayage horizontal, qui traverse d'après un principe physique connu, orthogonalement et sans déviation la lentille convergente frontale de l'appareil de réglage et contrôle de phares en son centre optique, permettant de visualiser l'impact "S" du rayon lumineux et le point "H" origine des mesures sur l'écran récepteur de lumière, et de déplacer cet écran lumineux par translations verticale et horizontale de façon à superposer de ces deux points "S" et "H" pour obtenir l'étalonnage final parfait de l'appareil de réglage et de contrôle des phares.in claim 1, characterized in that it comprises a light ray emitted by a source positioned on a support with two degrees of freedom of movement: one which produces a vertical scanning of the beam, the other a horizontal scanning, which crosses, according to a known physical principle, orthogonally and without deviation, the front converging lens of the headlight adjustment and control device at its optical center, making it possible to visualize the impact "S" of the light ray and the point "H" origin of the measurements on the light receiving screen, and to move this luminous screen by vertical and horizontal translations so as to superimpose these two points "S" and "H" to obtain the perfect final calibration of the adjustment device and headlight control.
FR9309642A 1993-07-30 1993-07-30 Method and device for facilitating the angular calibration of an apparatus used for adjusting the headlights of a vehicle. Expired - Fee Related FR2708739B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR9309642A FR2708739B1 (en) 1993-07-30 1993-07-30 Method and device for facilitating the angular calibration of an apparatus used for adjusting the headlights of a vehicle.

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FR9309642A FR2708739B1 (en) 1993-07-30 1993-07-30 Method and device for facilitating the angular calibration of an apparatus used for adjusting the headlights of a vehicle.

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FR2708739B1 FR2708739B1 (en) 1997-05-30

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19636520A1 (en) * 1996-09-09 1998-03-12 Hella Kg Hueck & Co Testing device for automobile headlamps
DE19817139A1 (en) * 1998-04-17 1999-10-21 Bayerische Motoren Werke Ag System for testing vehicle facilities which ideally transmit beam parallel to longitudinal axis of vehicle
FR2908883A1 (en) * 2006-11-21 2008-05-23 Peugeot Citroen Automobiles Sa Headlight adjustment device's measurement accuracy verifying method for motor vehicle, involves measuring precision of given measurement by headlight adjustment device by using calibrated cut-off line
EP3940364A1 (en) * 2020-07-17 2022-01-19 Dekra Automobil GmbH Alignment device and alignment method for a headlamp adjuster

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Publication number Priority date Publication date Assignee Title
US4273468A (en) * 1978-03-23 1981-06-16 Balfour Beatty Limited Tunnelling shields and like moveable apparatus
JPS56103302A (en) * 1980-01-21 1981-08-18 Fuji Photo Film Co Ltd Method for positioning lens in photodetector array
JPS5759125A (en) * 1980-09-26 1982-04-09 Nissan Motor Co Ltd Measuring device for luminous intensity distribution of car lamp
JPS57164703A (en) * 1981-04-03 1982-10-09 Nec Corp Adjusting method for bore sight
JPS57179703A (en) * 1981-04-30 1982-11-05 Mitsubishi Heavy Ind Ltd Centering method for laser measuring device
FR2644715A1 (en) * 1989-03-23 1990-09-28 Siderurgie Fse Inst Rech Method and device for aligning the members of a machine for the continuous horizontal casting of metals
US5164785A (en) * 1991-02-08 1992-11-17 Hopkins Manufacturing Corporation Headlight aiming apparatus and display

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4273468A (en) * 1978-03-23 1981-06-16 Balfour Beatty Limited Tunnelling shields and like moveable apparatus
JPS56103302A (en) * 1980-01-21 1981-08-18 Fuji Photo Film Co Ltd Method for positioning lens in photodetector array
JPS5759125A (en) * 1980-09-26 1982-04-09 Nissan Motor Co Ltd Measuring device for luminous intensity distribution of car lamp
JPS57164703A (en) * 1981-04-03 1982-10-09 Nec Corp Adjusting method for bore sight
JPS57179703A (en) * 1981-04-30 1982-11-05 Mitsubishi Heavy Ind Ltd Centering method for laser measuring device
FR2644715A1 (en) * 1989-03-23 1990-09-28 Siderurgie Fse Inst Rech Method and device for aligning the members of a machine for the continuous horizontal casting of metals
US5164785A (en) * 1991-02-08 1992-11-17 Hopkins Manufacturing Corporation Headlight aiming apparatus and display

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 5, no. 175 (P - 88)<847> 11 November 1981 (1981-11-11) *
PATENT ABSTRACTS OF JAPAN vol. 6, no. 137 (P - 130) 24 July 1982 (1982-07-24) *
PATENT ABSTRACTS OF JAPAN vol. 7, no. 26 (P - 172)<1171> 2 February 1983 (1983-02-02) *
PATENT ABSTRACTS OF JAPAN vol. 7, no. 6 (P - 167)<1151> 11 January 1983 (1983-01-11) *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19636520A1 (en) * 1996-09-09 1998-03-12 Hella Kg Hueck & Co Testing device for automobile headlamps
BE1010978A3 (en) * 1996-09-09 1999-03-02 Hella Kg Hueck & Co Test device for vehicle headlights.
DE19636520C2 (en) * 1996-09-09 1999-06-02 Hella Kg Hueck & Co Test device for vehicle headlights and method for aligning a test device with the center of the headlights
DE19817139A1 (en) * 1998-04-17 1999-10-21 Bayerische Motoren Werke Ag System for testing vehicle facilities which ideally transmit beam parallel to longitudinal axis of vehicle
FR2908883A1 (en) * 2006-11-21 2008-05-23 Peugeot Citroen Automobiles Sa Headlight adjustment device's measurement accuracy verifying method for motor vehicle, involves measuring precision of given measurement by headlight adjustment device by using calibrated cut-off line
EP3940364A1 (en) * 2020-07-17 2022-01-19 Dekra Automobil GmbH Alignment device and alignment method for a headlamp adjuster

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