CA2185387C - Headlight aiming apparatus and method - Google Patents
Headlight aiming apparatus and method Download PDFInfo
- Publication number
- CA2185387C CA2185387C CA002185387A CA2185387A CA2185387C CA 2185387 C CA2185387 C CA 2185387C CA 002185387 A CA002185387 A CA 002185387A CA 2185387 A CA2185387 A CA 2185387A CA 2185387 C CA2185387 C CA 2185387C
- Authority
- CA
- Canada
- Prior art keywords
- headlight
- matrix
- housing
- offset sample
- support
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract 9
- 239000011159 matrix material Substances 0.000 claims 42
- 230000002093 peripheral effect Effects 0.000 claims 3
- 230000003213 activating effect Effects 0.000 claims 2
- 230000004913 activation Effects 0.000 claims 2
- 238000013459 approach Methods 0.000 claims 2
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 230000007423 decrease Effects 0.000 claims 1
- 238000006073 displacement reaction Methods 0.000 claims 1
Classifications
-
- 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
- G01M11/064—Testing the alignment of vehicle headlight devices by using camera or other imaging system for the light analysis
- G01M11/065—Testing the alignment of vehicle headlight devices by using camera or other imaging system for the light analysis details about the image analysis
-
- 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
- G01M11/064—Testing the alignment of vehicle headlight devices by using camera or other imaging system for the light analysis
-
- 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
- G01M11/067—Details of the vehicle positioning system, e.g. by using a laser
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/401—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by control arrangements for measuring, e.g. calibration and initialisation, measuring workpiece for machining purposes
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D3/00—Control of position or direction
- G05D3/12—Control of position or direction using feedback
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/42—Servomotor, servo controller kind till VSS
- G05B2219/42222—Compare reflected image from object with reference image, adjust object
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/45—Nc applications
- G05B2219/45023—Align head lamps of car
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Automation & Control Theory (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Optics & Photonics (AREA)
- Human Computer Interaction (AREA)
- Manufacturing & Machinery (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
Abstract
An apparatus and method for aiming a vehicle headlight to a standard image pattern includes a frame movable relative to the vehicle. A housing carried on a vertically adjustable housing includes a lens focusing a headlight beam onto a reflective screen which reflects the beam image to a camera. A control compares the digitized image output from the camera with a standard image pattern and generates a correlation factor based on the difference between the reflected image and a standard image. Based on the difference, the control generates output signals to an adjustment device engagable with the headlight mounting frame to adjust the position of the mounting frame to reduce the difference to zero.
Claims (28)
1. An apparatus for aiming a vehicle headlight to a standard aiming image, the apparatus comprising:
means for storing standard headlight aiming image pattern as a standard image matrix;
means for sensing light emitted from a headlight, the sensing means generating an output on a pixel-by-pixel basis proportional to the sensed light intensity of each pixel;
means, responsive to the output from the sensing means, for converting the output to an intensity magnitude value for each pixel in a sensed image matrix;
means for forming a plurality of offset sample matrices, each formed of a portion of the sensed image matrix and a plurality of corresponding standard image sub-matrices each formed of a portion of the standard image matrix;
means for determining the offset sample matrix having the highest correlation to a corresponding standard image sub-matrix;
means for determining the center of the offset sample matrix having the highest correlation;
means, responsive to the means for determining the center of the offset sample matrix, for determining the difference between the center of said offset sample matrix and the center of the corresponding standard image sub-matrix, the difference determining means generating a difference output signal having a magnitude proportional to the difference; and means, responsive to the difference output, for activating an adjustment means engagable with headlight support to adjust the support to reduce the difference to zero.
means for storing standard headlight aiming image pattern as a standard image matrix;
means for sensing light emitted from a headlight, the sensing means generating an output on a pixel-by-pixel basis proportional to the sensed light intensity of each pixel;
means, responsive to the output from the sensing means, for converting the output to an intensity magnitude value for each pixel in a sensed image matrix;
means for forming a plurality of offset sample matrices, each formed of a portion of the sensed image matrix and a plurality of corresponding standard image sub-matrices each formed of a portion of the standard image matrix;
means for determining the offset sample matrix having the highest correlation to a corresponding standard image sub-matrix;
means for determining the center of the offset sample matrix having the highest correlation;
means, responsive to the means for determining the center of the offset sample matrix, for determining the difference between the center of said offset sample matrix and the center of the corresponding standard image sub-matrix, the difference determining means generating a difference output signal having a magnitude proportional to the difference; and means, responsive to the difference output, for activating an adjustment means engagable with headlight support to adjust the support to reduce the difference to zero.
2. The headlight aiming apparatus of claim 1 wherein:
the means for sensing, the means for forming a plurality of offset sample matrices and corresponding standard image sub-matrices and the means for determining the offset sample matrix having the highest correlation, the means for determining the center of said offset sample matrix with the highest correlation and the means for determining the difference between the center of said offset sample matrix and the corresponding standard image sub-matrix cooperate during activation of the adjustment means to vary the difference output generated by the difference determining means.
the means for sensing, the means for forming a plurality of offset sample matrices and corresponding standard image sub-matrices and the means for determining the offset sample matrix having the highest correlation, the means for determining the center of said offset sample matrix with the highest correlation and the means for determining the difference between the center of said offset sample matrix and the corresponding standard image sub-matrix cooperate during activation of the adjustment means to vary the difference output generated by the difference determining means.
3. The headlight aiming apparatus of claim 1 further comprising:
means for varying the speed of operation of the adjusting means in proportion to the magnitude of the difference output.
means for varying the speed of operation of the adjusting means in proportion to the magnitude of the difference output.
4. The aiming apparatus of claim 3 wherein:
the means for varying the operation speed of the adjustment means gradually decreases the speed of rotation of the adjustment means as the difference approaches zero.
the means for varying the operation speed of the adjustment means gradually decreases the speed of rotation of the adjustment means as the difference approaches zero.
5. The headlight aiming apparatus of claim 1 wherein the means for determining the offset sample matrix having the highest correlation to a corresponding standard image sub-matrix comprises:
means for multiplying the intensity magnitude value of each pixel in each sample matrix with the intensity magnitude value of the corresponding pixel in the corresponding image matrix;
means for summing all of the products for each sample matrix, the highest product signifying the sample matrix having the highest correlation with a corresponding image sub-matrix.
means for multiplying the intensity magnitude value of each pixel in each sample matrix with the intensity magnitude value of the corresponding pixel in the corresponding image matrix;
means for summing all of the products for each sample matrix, the highest product signifying the sample matrix having the highest correlation with a corresponding image sub-matrix.
6. The headlight aiming apparatus of claim 1 wherein the means for sensing light comprises:
a housing alignable with a headlight;
means, mounted in the housing, for detecting the intensity of light emitted from a headlight and entering the housing.
a housing alignable with a headlight;
means, mounted in the housing, for detecting the intensity of light emitted from a headlight and entering the housing.
7. The headlight aiming apparatus of claim 6 further comprising:
a reflective surface carried in the housing; and means for focusing light emitted from a headlight onto the reflective surface, the light incident on the reflective surface reflecting to the light detecting means.
a reflective surface carried in the housing; and means for focusing light emitted from a headlight onto the reflective surface, the light incident on the reflective surface reflecting to the light detecting means.
8. The headlight aiming apparatus of claim 7 further comprising:
means for adjusting the relative position of the focusing means and the reflective surface to each other.
means for adjusting the relative position of the focusing means and the reflective surface to each other.
9. The headlight aiming apparatus of claim 8 wherein the adjustment means comprises:
a fixed lens support mounted in the housing;
means, engagable with the lens and the fixed lens support, for adjusting the distance of the lens relative to the fixed lens support.
a fixed lens support mounted in the housing;
means, engagable with the lens and the fixed lens support, for adjusting the distance of the lens relative to the fixed lens support.
10. The headlight apparatus of claim 9 further comprising:
a plurality of fixed lens supports mounted in the housing, each fixed lens support disposed adjacent a peripheral portion of the lens;
a plurality of independently adjustable means engagable with each fixed lens support and spaced peripheral portions of the lens.
a plurality of fixed lens supports mounted in the housing, each fixed lens support disposed adjacent a peripheral portion of the lens;
a plurality of independently adjustable means engagable with each fixed lens support and spaced peripheral portions of the lens.
11. The headlight aiming apparatus of claim 10 wherein the adjustable mean comprises:
a threaded rod extendable through the lens and into adjustable threading engagement with each fixed lens support.
a threaded rod extendable through the lens and into adjustable threading engagement with each fixed lens support.
12. The headlight aiming apparatus of claim 11 further comprising:
biasing means, disposed between each fixed lens support and the lens, for biasing the lens away from the fixed lens supports.
biasing means, disposed between each fixed lens support and the lens, for biasing the lens away from the fixed lens supports.
13. The headlight aiming apparatus of claim 8 wherein the adjustment means comprises:
a fixed reflective surface support mounted in the housing;
means, engagable with the reflective surface and the fixed reflective surface support, for adjusting the distance between they fixed reflective surface support and the reflective surface.
a fixed reflective surface support mounted in the housing;
means, engagable with the reflective surface and the fixed reflective surface support, for adjusting the distance between they fixed reflective surface support and the reflective surface.
14. The aiming apparatus of claim 13 wherein the adjustment means comprises:
a threaded rod fixed to the housing and extending through a peripheral portion of the reflective surface and through one fixed reflective surface support;
a fastener engagable with the rod and disposed in registry with the reflective surface to fix the position of the reflective surface relative to the housing.
a threaded rod fixed to the housing and extending through a peripheral portion of the reflective surface and through one fixed reflective surface support;
a fastener engagable with the rod and disposed in registry with the reflective surface to fix the position of the reflective surface relative to the housing.
15. The headlight aiming apparatus of claim 1 further comprising:
a frame extending transverse to a longitudinal axis of the vehicle;
means for movably mounting the housing on the frame for movement between a home position and an aiming position.
a frame extending transverse to a longitudinal axis of the vehicle;
means for movably mounting the housing on the frame for movement between a home position and an aiming position.
16. The headlight aiming apparatus of claim 15 further comprising:
means for calibrating the position of the housing when the housing is at the home position.
means for calibrating the position of the housing when the housing is at the home position.
17. The headlight aiming apparatus of claim 16 wherein the means for calibrating comprises:
an aimed headlight mounted at the home position of the housing.
an aimed headlight mounted at the home position of the housing.
18. The headlight aiming apparatus of claim 16 wherein the means for calibrating comprises:
a laser mounted at the home position of the housing.
a laser mounted at the home position of the housing.
19. The headlight aiming apparatus of claim 15 further comprising:
means for storing the coordinate positions of the aiming position of the housing; and means, responsive to the stored coordinates, for moving the housing from the home position to the aiming position.
means for storing the coordinate positions of the aiming position of the housing; and means, responsive to the stored coordinates, for moving the housing from the home position to the aiming position.
20. The headlight aiming apparatus of claim 15 wherein the means for movably mounting the housing on the frame comprise:
an electrical motor having a bi-directional rotatable output shaft;
a motor support movably carried on the frame;
translation means, mounted on the frame transverse to a longitudinal axis of the vehicle, for translating the motor support; and drive means, engagable with the output shaft of the motor and the translation means, for driving the motor support horizontally along the translation means.
an electrical motor having a bi-directional rotatable output shaft;
a motor support movably carried on the frame;
translation means, mounted on the frame transverse to a longitudinal axis of the vehicle, for translating the motor support; and drive means, engagable with the output shaft of the motor and the translation means, for driving the motor support horizontally along the translation means.
21. The headlight aiming apparatus of claim 20 wherein the means for movably mounting the housing further comprises:
a vertical drive motor having a bi-directionally rotatable output shaft;
screw means, mounted on the support and extending from the support;
means for coupling the output shaft of the motor to the screw means; and receiver means, mounted on the housing and engagable with the screw means, for extending and retracting the housing relative to the support upon rotation of the screw means
a vertical drive motor having a bi-directionally rotatable output shaft;
screw means, mounted on the support and extending from the support;
means for coupling the output shaft of the motor to the screw means; and receiver means, mounted on the housing and engagable with the screw means, for extending and retracting the housing relative to the support upon rotation of the screw means
22. The headlight aiming apparatus of claim 21 further comprising:
guide means, carried on and extending between the housing and the support, for guiding the vertical displacement of the housing relative to the support.
guide means, carried on and extending between the housing and the support, for guiding the vertical displacement of the housing relative to the support.
23. A method of aiming a vehicle headlight to a standard image pattern, the method comprising the steps of:
storing a standard image pattern as a standard image matrix;
focussing a light beam from a vehicle headlight onto a reflective surface;
sensing the intensity of the reflected light beam from the surface on a pixel-by-pixel basis in a sensed image matrix;
assigning a magnitude value to each pixel in the sensed image matrix;
forming a plurality of consecutively offset sample matrices, each formed of a portion of the sensed image matrix;
forming a plurality of corresponding standard image sub-matrices, each formed of a portion of the standard image matrix;
determining the offset sample matrix having the highest correlation to a corresponding standard image sub-matrix;
determining the center of the offset sample matrix having the highest correlation;
determining a difference between the center of the offset sample matrix having the highest correlation with the center of the corresponding standard image sub-matrix; and activating an adjustment means engagable with a headlight adjustment frame to adjust the headlight position in at least one axis.
storing a standard image pattern as a standard image matrix;
focussing a light beam from a vehicle headlight onto a reflective surface;
sensing the intensity of the reflected light beam from the surface on a pixel-by-pixel basis in a sensed image matrix;
assigning a magnitude value to each pixel in the sensed image matrix;
forming a plurality of consecutively offset sample matrices, each formed of a portion of the sensed image matrix;
forming a plurality of corresponding standard image sub-matrices, each formed of a portion of the standard image matrix;
determining the offset sample matrix having the highest correlation to a corresponding standard image sub-matrix;
determining the center of the offset sample matrix having the highest correlation;
determining a difference between the center of the offset sample matrix having the highest correlation with the center of the corresponding standard image sub-matrix; and activating an adjustment means engagable with a headlight adjustment frame to adjust the headlight position in at least one axis.
24. The method of Claim 23 further comprising the step of:
varying the speed of operation of the adjustment means to zero as the difference approaches zero.
varying the speed of operation of the adjustment means to zero as the difference approaches zero.
25. The method of claim 23 further comprising the step of:
repeating the steps of forming and determining during activation of the adjustment means.
repeating the steps of forming and determining during activation of the adjustment means.
26. The method of claim 23 further comprising the steps of:
mounting a reflective surface in a housing;
mounting a focusing lens in the housing for focusing the light beam onto the reflective surface; and moving the housing from a home position to a vehicle headlight aiming position.
mounting a reflective surface in a housing;
mounting a focusing lens in the housing for focusing the light beam onto the reflective surface; and moving the housing from a home position to a vehicle headlight aiming position.
27. The method of claim 26 further comprising the steps of:
disposing a frame transverse to a longitudinal axis of the vehicle;
movably mounting the housing on the frame for movement of the housing between the home position and the aiming position.
disposing a frame transverse to a longitudinal axis of the vehicle;
movably mounting the housing on the frame for movement of the housing between the home position and the aiming position.
28. The method of claim 23 further comprising the steps of:
generating the product of the magnitude intensity value of each pixel in one offset sample matrix with the corresponding magnitude intensity value of the corresponding pixel in the corresponding standard image sub-matrix;
summing the products for each pixel in one offset sample matrix to form a correlation value for one offset sample matrix;
forming a second offset sample matrix offset from the first offset sample matrix by at least one pixel;
forming the product of the magnitude intensity value of each pixel in the second offset sample matrix with the corresponding magnitude intensity value of the corresponding pixel in a corresponding standard image sub-matrix;
summing the products for the second offset sample matrix to form a correlation value for the second offset sample matrix;
determining the highest correlation value between all of the offset sample matrices and the corresponding standard image sub-matrices;
determining the center of the offset sample matrix having the highest correlation value.
generating the product of the magnitude intensity value of each pixel in one offset sample matrix with the corresponding magnitude intensity value of the corresponding pixel in the corresponding standard image sub-matrix;
summing the products for each pixel in one offset sample matrix to form a correlation value for one offset sample matrix;
forming a second offset sample matrix offset from the first offset sample matrix by at least one pixel;
forming the product of the magnitude intensity value of each pixel in the second offset sample matrix with the corresponding magnitude intensity value of the corresponding pixel in a corresponding standard image sub-matrix;
summing the products for the second offset sample matrix to form a correlation value for the second offset sample matrix;
determining the highest correlation value between all of the offset sample matrices and the corresponding standard image sub-matrices;
determining the center of the offset sample matrix having the highest correlation value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002349881A CA2349881A1 (en) | 1995-09-29 | 1996-09-12 | Headlight aiming apparatus and method |
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US457195P | 1995-09-29 | 1995-09-29 | |
| US60/004,571 | 1995-09-29 | ||
| US1685596P | 1996-05-03 | 1996-05-03 | |
| US60/016,855 | 1996-05-03 | ||
| US08/699,521 | 1996-09-04 | ||
| US08/699,521 US5751832A (en) | 1996-09-04 | 1996-09-04 | Headlight aiming apparatus |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002349881A Division CA2349881A1 (en) | 1995-09-29 | 1996-09-12 | Headlight aiming apparatus and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2185387A1 CA2185387A1 (en) | 1996-11-04 |
| CA2185387C true CA2185387C (en) | 2002-04-30 |
Family
ID=27357663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002185387A Expired - Fee Related CA2185387C (en) | 1995-09-29 | 1996-09-12 | Headlight aiming apparatus and method |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPH09170965A (en) |
| CA (1) | CA2185387C (en) |
| DE (1) | DE19639986A1 (en) |
| GB (1) | GB2307312B (en) |
| IT (1) | ITMI961988A1 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1640700A1 (en) * | 2004-09-24 | 2006-03-29 | VisiCon Automatisierungstechnik GmbH | Device for adjusting vehicle headlights |
| JP4531658B2 (en) * | 2005-08-24 | 2010-08-25 | 三栄工業株式会社 | Headlight tester |
| JP5070260B2 (en) * | 2009-08-19 | 2012-11-07 | 三栄工業株式会社 | Headlight tester |
| CN103674503A (en) * | 2012-08-31 | 2014-03-26 | 弥荣(成都)实业有限公司 | Cylinder-propelled automobile aligning device |
| KR101941071B1 (en) * | 2012-12-04 | 2019-04-12 | 대우조선해양 주식회사 | Method and system for measuring of navigation light install degree of ship |
| CN106197955A (en) * | 2016-06-23 | 2016-12-07 | 重庆长安汽车股份有限公司 | A kind of fixed support for the test of automobile interior exterior portion light |
| DE102020206275A1 (en) | 2020-05-19 | 2021-11-25 | TechnoTeam Holding GmbH | Method and device for photometric measurement of a license plate number for a vehicle |
| EP3945300A1 (en) | 2020-07-28 | 2022-02-02 | Mahle International GmbH | Adas calibration system for calibrating at least one headlamp of a vehicle |
| USD977351S1 (en) * | 2020-09-11 | 2023-02-07 | Autel Intelligent Technology Corp., Ltd. | Vehicle calibrating and aligning apparatus |
| DE102022211933A1 (en) * | 2022-11-10 | 2024-05-16 | Maha Maschinenbau Haldenwang Gmbh & Co. Kg | DEVICE AND METHOD FOR ALIGNMENT OF A HEADLAMP ALIGNMENT TESTING DEVICE |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1360619A (en) * | 1972-03-30 | 1974-07-17 | Hartridge Ltd Leslie | Apparatus for testing beams of light |
| EP0185800A1 (en) * | 1984-12-28 | 1986-07-02 | Anzen Motor Car Co., Ltd. | Apparatus for determining the irradiation direction of a headlight beam |
| US4948249A (en) * | 1987-06-23 | 1990-08-14 | Hopkins Manufacturing Corporation | Headlight aiming and light pattern testing apparatus and method |
| US5164785A (en) * | 1991-02-08 | 1992-11-17 | Hopkins Manufacturing Corporation | Headlight aiming apparatus and display |
| US5210589A (en) * | 1991-12-16 | 1993-05-11 | Chuo Electronic Measurement Co., Ltd. | Apparatus for measuring optical-axis deflection angle of headlight |
| US5331393A (en) * | 1992-12-11 | 1994-07-19 | Hopkins Manufacturing Corporation | Method and apparatus for locating a specific location on a vehicle headlamp |
| US5426500A (en) * | 1994-01-04 | 1995-06-20 | Chuo Electronic Measurement Co., Ltd. | Illuminance measurement of vehicle lamp |
-
1996
- 1996-09-12 CA CA002185387A patent/CA2185387C/en not_active Expired - Fee Related
- 1996-09-17 DE DE19639986A patent/DE19639986A1/en not_active Withdrawn
- 1996-09-26 JP JP8254374A patent/JPH09170965A/en active Pending
- 1996-09-27 IT IT001988A patent/ITMI961988A1/en not_active IP Right Cessation
- 1996-09-30 GB GB9620347A patent/GB2307312B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE19639986A1 (en) | 1997-04-03 |
| GB9620347D0 (en) | 1996-11-13 |
| JPH09170965A (en) | 1997-06-30 |
| GB2307312A (en) | 1997-05-21 |
| ITMI961988A0 (en) | 1996-09-27 |
| GB2307312A8 (en) | 1997-09-11 |
| GB2307312B (en) | 1999-06-16 |
| ITMI961988A1 (en) | 1997-03-30 |
| CA2185387A1 (en) | 1996-11-04 |
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| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |