US3746449A - Headlight tester - Google Patents

Headlight tester Download PDF

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Publication number
US3746449A
US3746449A US00078367A US3746449DA US3746449A US 3746449 A US3746449 A US 3746449A US 00078367 A US00078367 A US 00078367A US 3746449D A US3746449D A US 3746449DA US 3746449 A US3746449 A US 3746449A
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United States
Prior art keywords
pair
light
light sensitive
edge
meter
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US00078367A
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English (en)
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F Schick
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TA ACQUISITION CORP
WEAVER Corp A MI CORP
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DURO CORP
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Assigned to WEAVER CORPORATION, A MI CORP. reassignment WEAVER CORPORATION, A MI CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: DURA CORPORATION
Assigned to WEAVER CORPORATION, A DE CORP. reassignment WEAVER CORPORATION, A DE CORP. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WEAVER CORPORATION
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/02—Testing optical properties
    • G01M11/06—Testing the alignment of vehicle headlight devices

Definitions

  • ABSTRACT 75 lnvemor; Frederick Schick Springfield L A device for use in determining the location of an edge of a pattern of a light source while either testing the alignment or aiming the low beam of a light source such [73 ⁇ Asslgnee' Dura corporatlon Springfield as a No. 2 headlight, characterized by a pair of verti- [22] Fil d; O 6, 1970 cally spaced photoelectric devices which are located on a support such as a screen or board with one device [21 1 Appl. No.: 78,367 above and one device below a predetermined desired position for the upper edge of the high intensity zone of a pattern of the light source and a second pair of [52] US.
  • 350/2l9 WD photoelectric devices either by aiming the headlight or yi i g g by moving the support for the pairs of photoelectric de- 310771139 2/1963 rzdh et al. .11: .11: 356/121 vices produce the greatest indium the mmiam Primary Examiner-R0nald L. Wibert Assistant Examiner-Conrad Clark At!0rney-Hill, Sherman, Meroni, Gross & Simpson meter, the edge, either the upper edge or the left edge of the high intensity zone, is aimed to coincide with the predetermined desired position.
  • the present invention is directed to an aiming or testing device and particularly to the photoelectric means used therewith.
  • One lighting inspection code requires alignment of the low beam light pattemsuch as that of a number 2 type headlight so the upper horizontal edge of the high intensity zone of the headlight is at the height of the horizontal centerline of the headlight whenthe pattern is projected on a screen at a distance of 25 feet.
  • the code also requires that the left edge of the high intensity zone of the pattern be displaced approximately 2 inches to the right of the vertical centerline of the headlight to minimize glare to oncoming drivers during nighttime driving conditions.
  • One method utilizes mechanical devices mounted on the built in aiming pads around the edge of the face of the headlight lens to position the plane of the aiming pads in correct relationship with the horizontal and vertical axes of the headlamp.
  • One method utilizes mechanical devices mounted on the built in aiming pads around the edge of the face of the headlight lens to position the plane of the aiming pads in correct relationship with the horizontal and vertical axes of the headlamp.
  • manufacturing tolerances such as irregular beam patterns and variations in alignment of the plane of the aiming pads with the beam pattern edges, considerable variations in heart! aim can result.
  • a second method for either aiming headlights or testing headlight alignment utilizes a screen having reference marks or lines and the operator visually locates the edges of the high intensity zone of the light beam with respect to the predetermined reference lines.
  • a method requires a darkened work area and is subject to operator errorsdue to judgment variations between operators as to the position of the edge of the high intensityzone.
  • a third method utilizes a device having photoelectric sensitive cells arranged in a pattern to indicate the center of the high intensity zone of the lamp.
  • the aiming of the center of the high intensity zone is believed to properly aim the left-hand vertical edge and the upper horizontal edge.
  • This method can use an apparatus which is positioned adjacent to the headlight and examples of the type of apparatus are illustrated in U.S. Pat. No.2,29l,l l4, Pat. No. 2,308,095 and U.S. Pat. No. 2,714,327.
  • This method has also been used with an aiming screen such as disclosed in US. Pat. No. 3,077,139.
  • a fourth method for aligning the left-hand vertical edge and the upper horizontal edge of high intensity zone of a headlight beam utilizes a projection board and an arrangement of photoelectric cells such as disclosed in U.S. Pat. Nos. 3,386,333 and 3,467,473.
  • three cells are aligned on a vertical line and three cells are placed on a horizontal line in a particular arrangement with regard to the desired reference lines for both the upper horizontal edge and the left-hand edge of the high intensity zone.
  • the. output of each of the three cells is connected to a computer amplifier which obtains a factor or quantity by dividing the output of the cell disposed furthest in the high intensity zone by the difference of the intermediate cell minus the output of the cell disposed on the reference line.
  • the present invention comprises an arrangement of photoelectric cells for determining the location of an edge of a beam pattern from a light source and is utilized while either testing the alignment of a light source such as a headlight or aiming an edge of a beam pattern from the light source.
  • the photoelectric cells are arranged on a support means such as'a screen or board as a spaced pair with a desired reference line or desired position for the edge extending therebetween and a pair of photoelectric cells is connected to a meter means, such as a milliammeter, which is connected in a manner to determine the difference in the output of the two photoelectric cells which difference is at a maximum when the edge of the high intensityzone coin cides with the predetermined reference line or desired position.
  • Another object of the presentinvention is to provide a device for headlight aimingand testing which determines the location of theedges of a headlight high intensity zone regardless of variations in the structure of the headlight.
  • a still further object of the present invention is a device for locating the edges of a highintensity zone of a headlight regardless of the operator's skill.
  • Yet another object of the present invention is to provide a device for locating the edges of the high intensity zoneof a light source which device is relatively inex pensive to manufacture.
  • FIG. 1 is a plan view of the aiming board of the present invention
  • FIG. 2 is a circuit diagram for the present invention
  • FIG. 3 is a diagrammatic view showing the invention as used with a condensing lens and a smaller board or screen;
  • FIG. 4 is a plan view of the board or screen of FIG. 3.
  • the principles of the present invention are particularly useful in a headlight aiming and testing system for an automotive vehicle headlight which includes an aiming board or screen generally indicated at in FIG. 1.
  • the board 10 has a horizontal line 1 1 which is a predetermined reference line for an upper horizontal edge 12 of the high intensity zone 13 of the light beam pattern.
  • a second reference line 14 is a vertical line placed on the board at the predetermined position for the left vertical edge 15 of the high intensity zone 13.
  • One method of using this system would be to have photoelectric cells supported by the board 10 in which the headlight of the vehicle is located 25 feet in front of the board 10 with the horizontal centerline of the headlight coinciding with the horizontal reference line 1 l and with its vertical centerline located at a predetermined distance to the left of the reference line 14.
  • the vertical centerline of the headlight should be 2 inches to the left of the reference line 14. According to this recommended procedure, a tolerance of plus or minus 2 inches is allowed on the location of the upper horizontal edge 12 with respect to the reference line 11 and a tolerance of 2 inches to the left and 4 inches to the right is allowable in the position of the edge 15 with respect to the reference line 14.
  • the light sensitive means are of a type that convert light energy into electromotive force or to state it in another manner create electrical energy when exposed to light which amount of energy is proportional to the intensity of light being projected on the cell.
  • the photoelectric devices 17 and 18 are arranged as a pair and are vertically spaced from each other on a line extending substantially transversely to the horizontal reference line 11. As illustrated, the device 17 is disposed below the line 1 l and the device 18 is positioned above the line 11. The devices 19 and 20 are arranged on a horizontally extending line which is transverse to the reference line 14 which extends therebetween. As illustrated, the reference lines 11 and 14 which pass between the pairs of photoelectric devices are at a predetermined distance from each of the photoelectric devices of their respective pairs.
  • a meter means such as a milliammeter 23 or 24 is provided.
  • the meter'23 is electrically connected to the photoelectric device 17 by leads 25 and 26 and is connected to the photoelectric device 18 by leads 27 and 28.
  • the meter 24 is connected to the photoelectric device 19 by leads 30 and 31 and to the photoelectric device 20 by leads 32 and 33.
  • each of the meters 23 and 24 has an indicating needle and preferably is a center null type meter.
  • FIG. 2 a circuit diagram show ing the electrical connection for the photoelectric devices 19 and 20 to the meter 24 is illustrated.
  • the photoelectric device 19 has its negative terminal connected to terminal of the milliammeter 24 by lines 41 and 42 and has a positive terminal connected to the terminal 43 of the meter 24 by lines 45 and 46.
  • the photoelectric device 20 has its negative terminal connected to the terminal 43 of the meter 24 by lines 46 and 47 and terminal 40 of the meter 24 is connected by lines 42 and 48 to the positive terminal of the device 20.
  • both photoelectric devices 19 and 20 are creating an electromotive force, the current flow from the device 19 through the milliammeter 24 is opposite to the current flow of the photoelectric device 20.
  • the device 19 With the photoelectric devices 19 and 20 arranged with respect to the reference line 14, the device 19 is located in the area of the high intensity zone 13 of the light beam and therefore is producing electromotive force.
  • the photoelectric device 20 is outside of the zone 13 and is thus producing either none or a very small amount of electrical current.
  • the edge 15 of the zone 13 is moved to the left, the amount of light projecting on the device 20 increases so that its current output increases.
  • the projecting of light on the device 20 causes a reduction in the internal resistance of the device 20 which allows a portion of the current produced in the device 19 to flow through the device 20 and reduce the amount of current flowing through the meter 24.
  • the milliammeter 24 Since the milliammeter 24 is indicating the relative difference between the two currents which are flowing in opposite directions through the meter, its reading will be changed as the output of electromotive force from the device 20 increases. If the edge 15 of the zone 13 is moved to the right of the line 14, the amount of light being projected on the device 19 decreases causing a decrease in its electromotive force which causes a lowering of the current flow therefrom.
  • the operator moves the light beam horizontally to the left and then to the right and determines the maximum reading on the meter 24. At the maximum reading, the edge 15 will be aimed to coincide with the reference line 14. If the edge is moved to the left, the output from the device 20 is increased and causes a drop in the reading of the meter. If the edge 15 is movedto the right, the intensity of the light projected on the device 29 decreases causing a decrease in the output to cause a reduction in the meter reading or indication.
  • the electrical circuitry for the devices 17 and 18 and the meter 23 is exactly the same as the previously described circuitry.
  • the edge 12 is aimed at the desired line 11 when the reading of the meter 23 is at a maximum. If the edge 12 is moved upward from the desired position, the photoelectric device 18 will increase its output which passes through the meter 23 in a direction opposite to the output of the device 17 and will reduce the reading of the meter. If the edge 12 is moved below the line 11, the output of the device 17 decreases resulting in a decrease indication from the meter 23.
  • the operator of the system moves the high intensity zone 13 vertically up and down and determines the maximum meter reading and then resets the adjustment screws on the headlight to obtain that predetermined maximum reading.
  • the screen 10 is replaced by a small aiming board or screen 10a which is used in conjunction with a condensing lens C which reduces the size of the light pattern from a light source L (FIG. 3).
  • the screen is a support means for photoelectric devices 17a 20a (FIG. 4) which devices are arranged on the screen a in a manner similar to the arrangement of the photoelectric devices l7-20 in FIG. 1 with devices 17a and 18a on opposite sides of position or reference line 11a and connected to meter means 230 and the devices 19a and 20a on opposite sides of a reference or position line 14a and connected to meter means 24a.
  • the photoelectric devices may be mounted on the front surface of the screen or behind the screen and exposed to the light beam through suitable apertures 51-54 therein (FIG. 4).
  • the screen may be translucent so that light passing therethrough impinges on the photoelectric devices.
  • the screen 100 is positioned relatively close to the light source L which may be a headlight or other light source such as a fog light or spot light.
  • the distance between the screen 10a and light source L is determined by the characteristic of the condensing lens C and is adjusted to have the effect of the 25 feet as previously explained.
  • the screen 10a is positioned in a zero position with respect to the light source by support structure not illustrated, so that a properly aimed headlight will have its left vertical edge coincide with line 14a and upper horizontal edge coincide with the line 1 la.
  • the screen 10a is moved to the right and left and then up and down by appropriate means in the support structure to obtain the maximum readings on meter 24a and 230, respectively, which readings determine when the left vertical edge and upper horizontal edge of the high intensity zone of the headlight being tested coincide with the predetermined position. lines 140 and 11a respectively.
  • the amount of error in the alignment of the light source from a proper alignment can be determined. If an error exists, the screen 10a is returned to the zero position and the headlight adjusted to properly aim the left vertical edge and the upper horizontal edge at the position lines 14a and 1 la respectively.
  • the screen or board 10a can be used in a device for either testing the alignment of a light source alone or testing and correctly aiming the light source to be in the proper alignment.
  • the board or screen 10a acts as a support means for the two pairs of photoelectric devices 17a-20a which support means is movable in a support structure.
  • each pair of photoelectric devices can be mounted on a separate support means such as a bracket with the desired position or reference line disposed between the devices of each pair.
  • Each of the brakets is movably mounted in the support structure by means such as calibrated knobs with one bracket being movable along a horizontal line and the other bracket being movable along a vertical line.
  • the means for moving the brackets have an appropriate scale which is calibrated toshow the corresponding distance of movement at 25 feet and which scales provide the amounts of error of the alignment of both the horizontal edge and vertical edge of a light source from a proper aligned position.
  • the arrangement of the brackets with their pairs of photoelectric devices can be used either for testing the alignment of a light source alone or for testing and correcting a light source to be in a proper alignment as described hereinabove.
  • an advantage of the present system over those of the prior art is its simplicity and inexpensive manufacturing costs.
  • Another advantage is that although the pairs of photoelectric devices such as 17 and 18 should be of similar characteristics, manufacturing variations therein will not effect the re sults during either testing or aiming of a headlight. Therefore, there is no necessity for calibrating the photoelectric devices of each pair with respect to each other. Thus the frequently required calibration of some prior art systems is not required by the photoelectric system of the present invention.
  • each of said light sensitive means comprising a photoelectric device having a negative terminal and a positive terminal;
  • electromotive force current from the device which will be normally located in said intensity zone when the edge thereof is on said predetermined position is opposite to the current flow of the device which is normally outside of said intensity zone when said edge is on said position.
  • a headlight aiming device for use in a system to determine the location of an edge of a light source such as an edge of a high intensity zone of a light pattern of a headlight of an automotive vehicle, comprising:
  • a pair of light sensitive means for sensing the intensity of light projected thereon by converting light energy into electromotive forces
  • said pair of light sensitive means being disposed on said supporting means on a line extending transversely to the edge of said light high intensity zone and having a predetermined position located therebetween;
  • said pair of light sensitive means being coupled to each other and said meter means being connected to each of said pair of light sensitive means in a manner to register the difference of the electromotive forces produced thereby so that relative movement of thesupporting means and the edge of the high intensity zone to coincide with the predetermined position creates a maximum indication on the meter means;
  • each of said light sensitive means comprising a photoelectric device having a negative terminal and a positive terminal;
  • electromotive force current from the device which will be normally located in said intensity zone when the edge thereof is on said predetermined position is opposite to the current flow of the device which is normally outside of said intensity zone when said edge is on said position.
  • a system for determining the location of both a horizontal and a vertical edge of a high intensity zone of a light pattern of a light source such as a headlight of an automobile comprising:
  • said second means comprising a pair of light sensitive means for sensing the intensity of the light projected thereon;
  • the light sensitive means of both pairs converting light energy into electromotive force and wherein the indication of each of the meter means is a difference of the magnitude of the electromotive force created by the pair of light sensitive means connected thereto;
  • said light sensitive means of each pair comprising a photoelectric device having a respective negative terminal and a'respective positive terminal; the negative terminal of one of said devices in each pair being electrically connected with the positive terminal of its pairmate and to one terminal of the meter means associated with that respective pair;
  • a headlight aiming device for use in a system to determine the location of an edge of a light source such as an edge of a high intensity zone of a light pattern of a headlight of an automotive vehicle, comprising:
  • a pair of light sensitive means for sensing the intensity of light projected thereon by converting light energy into electromotive forces
  • said pair of light sensitive means being disposed on said supporting means on a line extending transversely to the edge of said light high intensity zone and having a predetermined position located therebetween;
  • said pair of light sensitive means being coupled to each other and said meter means being connected to each of said pair of light sensitive means in a manner to register the difference of the electromotive forces produced thereby so that relative movement of the supporting means and the edge of the high intensity zone to coincide with the predetermined position creates a maximum indication on the meter means;
  • a second pair of light sensitive means for sensing the intensity of light projected thereon by converting light energy to electromotive forces
  • said second pair of light sensitive means being mounted on the second supporting means on a line extending transversely to the first pair and being spaced apart with a second predetermined position located therebetween;
  • said second pair of light sensitive means being coupled to each other and said second meter means being connected to each of the light sensitive means of the second pair in a manner to indicate the difference in the electromotive forces generated therein so that the relative movement of the high intensity zone and the supporting means to have an edge coinciding with each of said firstmentioned position and a second position creates a maximum indication on each of said meter means;
  • the light sensitive means of both pairs converting light energy into electromotive force and the indication of each of the meter means is a difference of the magnitude of the electromotive force created by the pair of light sensitive means connected thereto;
  • said light sensitive means of each pair comprising a photoelectric device having a respective negative terminal and a respective positive terminal;
  • each respective pair of photoelectric devices being connected to another terminal of said meter means, each of said meter means being a center null type meter;
  • the arrangement being such that one of the devices of each pair is normally located within said high intensity light zone pattern when said edges are in substantial coincidence with said predetermined positions andthe remaining device of each pair is outside of said zone.

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  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Length Measuring Devices By Optical Means (AREA)
US00078367A 1970-10-06 1970-10-06 Headlight tester Expired - Lifetime US3746449A (en)

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US7836770A 1970-10-06 1970-10-06

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CA (1) CA949743A (cs)
DE (1) DE2149870C3 (cs)
FR (1) FR2109957A5 (cs)
GB (1) GB1320592A (cs)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4092071A (en) * 1975-04-01 1978-05-30 Cibie Projecteurs Photoelectric determination of the cut-off of a light beam from a motor vehicle headlamp
FR2580399A1 (fr) * 1985-04-15 1986-10-17 Automatisme Reglage Optique Procede et dispositif permettant de faciliter le reglage angulaire lateral d'un projecteur lumineux de vehicule
DE3700061A1 (de) * 1986-01-10 1987-07-16 Westinghouse Electric Corp Einrichtung zum bestimmen der charakteristiken eines optischen strahlenbuendels
US4907877A (en) * 1983-10-28 1990-03-13 Yutaka Fukuda Light destribution of headlight beam
US4973155A (en) * 1988-07-29 1990-11-27 Mazda Motor Corporation Method of aiming adjustment for headlights of automotive vehicles
US5164785A (en) * 1991-02-08 1992-11-17 Hopkins Manufacturing Corporation Headlight aiming apparatus and display
US5331393A (en) * 1992-12-11 1994-07-19 Hopkins Manufacturing Corporation Method and apparatus for locating a specific location on a vehicle headlamp
US5485265A (en) * 1994-09-02 1996-01-16 Hopkins Manufacturing Corporation Vehicle headlight aiming apparatus
US7876427B1 (en) 2009-01-17 2011-01-25 Stephen Waller Melvin Headlamp alignment detection using a network of independent sensor units
US8125628B1 (en) 2009-01-17 2012-02-28 Lones Joe J Light baffling apparatus for headlamp sensor
US8422004B1 (en) 2011-12-08 2013-04-16 Ford Global Technologies, Llc Automotive headlamp aiming insensitive to intensity variations
US10408706B2 (en) * 2017-06-30 2019-09-10 GM Global Technology Operations LLC Method and apparatus for aiming a vehicle lamp

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0185800A1 (en) * 1984-12-28 1986-07-02 Anzen Motor Car Co., Ltd. Apparatus for determining the irradiation direction of a headlight beam

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2643117A (en) * 1949-08-29 1953-06-23 Electric Eye Equipment Company Automatic control system
US2714327A (en) * 1950-06-03 1955-08-02 Weaver Mfg Co Photoelectric cell circuit
US3077139A (en) * 1958-05-09 1963-02-12 Gen Motors Corp Apparatus for aiming headlamps
US3532432A (en) * 1968-08-01 1970-10-06 Ford Motor Co Headlamp aiming apparatus and method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2643117A (en) * 1949-08-29 1953-06-23 Electric Eye Equipment Company Automatic control system
US2714327A (en) * 1950-06-03 1955-08-02 Weaver Mfg Co Photoelectric cell circuit
US3077139A (en) * 1958-05-09 1963-02-12 Gen Motors Corp Apparatus for aiming headlamps
US3532432A (en) * 1968-08-01 1970-10-06 Ford Motor Co Headlamp aiming apparatus and method

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4092071A (en) * 1975-04-01 1978-05-30 Cibie Projecteurs Photoelectric determination of the cut-off of a light beam from a motor vehicle headlamp
US4907877A (en) * 1983-10-28 1990-03-13 Yutaka Fukuda Light destribution of headlight beam
FR2580399A1 (fr) * 1985-04-15 1986-10-17 Automatisme Reglage Optique Procede et dispositif permettant de faciliter le reglage angulaire lateral d'un projecteur lumineux de vehicule
EP0200072A1 (fr) * 1985-04-15 1986-11-05 SOCIETE D'AUTOMATISME ET DE REGLAGE OPTIQUE Société à responsabilité limitée Procédé et dispositif permettant de faciliter le réglage angulaire latéral d'un projecteur lumineux de véhicule
US4744655A (en) * 1985-04-15 1988-05-17 Societe d'Automatisme et de Reglage Optique Method and device permitting facilitation of the lateral angular adjustment of a vehicle headlight
DE3700061A1 (de) * 1986-01-10 1987-07-16 Westinghouse Electric Corp Einrichtung zum bestimmen der charakteristiken eines optischen strahlenbuendels
FR2592953A1 (fr) * 1986-01-10 1987-07-17 Westinghouse Electric Corp Systeme et procede pour determiner les caracteristiques d'un faisceau optique.
US4712914A (en) * 1986-01-10 1987-12-15 Westinghouse Electric Corp. Device for characterizing wide angle beams
US4973155A (en) * 1988-07-29 1990-11-27 Mazda Motor Corporation Method of aiming adjustment for headlights of automotive vehicles
US5164785A (en) * 1991-02-08 1992-11-17 Hopkins Manufacturing Corporation Headlight aiming apparatus and display
US5373357A (en) * 1991-02-08 1994-12-13 Hopkins Manufacturing Corporation Headlight aiming method using pattern framing
US5331393A (en) * 1992-12-11 1994-07-19 Hopkins Manufacturing Corporation Method and apparatus for locating a specific location on a vehicle headlamp
US5485265A (en) * 1994-09-02 1996-01-16 Hopkins Manufacturing Corporation Vehicle headlight aiming apparatus
US7876427B1 (en) 2009-01-17 2011-01-25 Stephen Waller Melvin Headlamp alignment detection using a network of independent sensor units
US8004663B1 (en) 2009-01-17 2011-08-23 Stephen Waller Melvin Headlamp aim detection with sensors independent from host control unit
US8125628B1 (en) 2009-01-17 2012-02-28 Lones Joe J Light baffling apparatus for headlamp sensor
US8184275B1 (en) 2009-01-17 2012-05-22 Stephen Waller Melvin Vehicle headlamp monitoring using a network accessible user interface
US8422004B1 (en) 2011-12-08 2013-04-16 Ford Global Technologies, Llc Automotive headlamp aiming insensitive to intensity variations
US10408706B2 (en) * 2017-06-30 2019-09-10 GM Global Technology Operations LLC Method and apparatus for aiming a vehicle lamp

Also Published As

Publication number Publication date
DE2149870A1 (de) 1972-04-13
CA949743A (en) 1974-06-25
GB1320592A (en) 1973-06-13
DE2149870B2 (cs) 1974-10-10
FR2109957A5 (cs) 1972-05-26
DE2149870C3 (de) 1975-05-22

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