GB2149489A - Dipped light headlamp for motor vehicles - Google Patents

Dipped light headlamp for motor vehicles Download PDF

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Publication number
GB2149489A
GB2149489A GB08426250A GB8426250A GB2149489A GB 2149489 A GB2149489 A GB 2149489A GB 08426250 A GB08426250 A GB 08426250A GB 8426250 A GB8426250 A GB 8426250A GB 2149489 A GB2149489 A GB 2149489A
Authority
GB
United Kingdom
Prior art keywords
light beam
objective
headlamp
shutter
coil
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.)
Granted
Application number
GB08426250A
Other versions
GB8426250D0 (en
GB2149489B (en
Inventor
Heinz Kretschmer
Gerhard Lindae
Peter Perthus
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of GB8426250D0 publication Critical patent/GB8426250D0/en
Publication of GB2149489A publication Critical patent/GB2149489A/en
Application granted granted Critical
Publication of GB2149489B publication Critical patent/GB2149489B/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/40—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
    • F21S41/43—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades characterised by the shape thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/162—Incandescent light sources, e.g. filament or halogen lamps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/162—Incandescent light sources, e.g. filament or halogen lamps
    • F21S41/166—Incandescent light sources, e.g. filament or halogen lamps characterised by the shape of the filament
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F21S41/255—Lenses with a front view of circular or truncated circular outline
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/321—Optical layout thereof the reflector being a surface of revolution or a planar surface, e.g. truncated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/323—Optical layout thereof the reflector having two perpendicular cross sections having regular geometrical curves of a distinct nature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/40—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/68—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on screens
    • F21S41/683—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on screens by moving screens
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/68—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on screens
    • F21S41/683—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on screens by moving screens
    • F21S41/692—Shields, i.e. screens not creating an image meant to be projected
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
    • F21W2102/10—Arrangement or contour of the emitted light
    • F21W2102/13—Arrangement or contour of the emitted light for high-beam region or low-beam region
    • F21W2102/135—Arrangement or contour of the emitted light for high-beam region or low-beam region the light having cut-off lines, i.e. clear borderlines between emitted regions and dark regions
    • F21W2102/155—Arrangement or contour of the emitted light for high-beam region or low-beam region the light having cut-off lines, i.e. clear borderlines between emitted regions and dark regions having inclined and horizontal cutoff lines

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

The dipped light headlamp for motor vehicles has an axial coil (17), which is located in front of the inner focal point (14) of the elliptical vertical meridian (12), and the coil axis (18) is arranged parallel to and above the optical axis (16). The optically effective edge (21) of the shutter (20) is arranged beneath and behind the outer focal point (15). A following objective (22) is a body of rotation, the axis of rotation (23) of which lies beneath and parallel to the optical axis (16). <IMAGE>

Description

SPECIFICATION Dipped light headlamp for motor vehicles The invention relates to a dipped light headlamp for motor vehicles according to the precharacterising clause of Claim 1. Headlamps of this type are known, inter alia as so-called parabolicelliptical, polyelliptical or triaxial ellipsoids, in which at least the vertical meridian of the reflector is a part of an ellipse and also exhibits an inner and an outer focal point. These headlamps have various optical advantages compared to headlamps constructed with a paraboloid reflector. However, here again that part of the crude light beam which is shaded off by the shutter is not utilised optically, and the efficiency in this respect is also not improved.
Various proposals have been made to utilise optically the shaded out part of the crude light beam and thereby to improve the efficiency, however they did not find acceptance in practice, whether due to an unfavourable cost to usefulness ratio orto high temperatures in the region of the shutter.
The efficiency of the headlamp is considerably improved by the features of Claim 1, mainly without additional technical outlay, by a modified arrangement of the components which are present in any case, without utilising the shaded out part of the crude light beam.
By feature e), the zone of greatest brightness is shifted upwards in a projected image (test screen) and an improvement of efficiency is thereby achieved. By feature f), the light-dark limit is displaced upwards and produces an enlargement of the visible part of the crude light beam.
Advantageous further developments of the invention are described in the subordinate Claims.
By feature h), the dipped light beam is fanned more intensely sideways (speading, lateral scatter). By feature i), it is achieved that the objective encompasses the entire crude light beam.
By the conjoint displacement of the shutter and of the objective according to feature j), on the one hand the overall depth, that is to say the overall length relative to the x-axis referred to the system, is considerably shortened, and on the other hand the objective is brought closer to the light source (incandescent coil), whereby-for equal diameter of the objective-the angular lateral illumination is further improved. The above-mentioned advantages are achieved particularly by the use of an axial coil according to feature k), and by its arrangement according to feature 1).
An exemplary embodiment of the invention is illustrated in the drawing and described more fully in the description of the Figures, wherein: Fig. 1 shows the diagrammate arrangement, not drawn to scale, of a dipped light headlamp for motor vehicles in vertical section; and Fig. 2 shows the image of the crude light beam cast upon a test screen.
Description of the Exemplary Embodiment A motor vehicle headlamp for generating the dipped light for motor vehicles in Fig. 1 has a reflector 10, the horizontal meridian of which is a part of an ellipse of greater focal length, and the vertical meridian 12 of which is a part of an ellipse 13 of shorter focal length having the inner focal point 14 and the outer focal point 15. Both the focal points 14 and 15 lie upon the optical axis 16 (reflector axis, system axis) in which the horizontal and vertical meridians 11,12 intersect.
An incandescent coil 17 is constructed as an axial coil (longitudinal coil), which is arranged with its centre of gravity in front of the inner focal point 14 and in the direction 19 of the reflected rays. The spiral axis 18 is located parallel to the optical axis 16, and a shutter 20 with an optically effective edge 21 is arranged beneath the focal point 15 and counter to the ray direction 19 so that the crude light beam is formed with the light-dark limit (Fig. 2).
An objective 22 is constructed symmetrically of rotation with the axis of rotation 23, which is oriented beneath and parallel to the optical axis 16.
The interval of the objective 22 from the shutter 20 is determined by the required sharpness (blurring) of the dipped light beam which the objective 22 forms from the crude light beam.
Fig. 2 shows by sectors a test screen 24 used for testing the law with the dipped light beam 25 formed by the objective 22 (Fig. 1), in which isolux lines 26 (lines of equal brightness) are plotted. That part of the reflected light rays shaded out by the shutter 20 (Fig. 1) is designated 20', and the edge 21 of the shutter 20 forms a light-dark limit 21' of the shuttered light beam 25. W is the vertical plane and HH is the horizontal plane, relative to which the light beam 25 is to be adjusted. In order to obtain the adjustment illustrated, it is necessary interalia for the optical axis 16 (Fig. 1) to be inclined downwards into the new position 16'.
1. Dipped light headlamp for motor vehicles with: a) a reflector, the vertical meridian of which is a part of an ellipse, and at least the horizontal meridian of which is a part of a conic section line, b) an incandescent coil is arranged in the region of the inner focal point of the vertical meridian, c) a shutter having an optically effective edge forms the crude light beam with the light-dark limit, d) an objective is arranged in the ray path of the crude light beam and forms the dipped light beam, characterised by: : e) the incandescent coil (17) is located above the innerfocal point (14) ofthevertical meridian (12),f) the edge (21) of the shutter (20) is arranged in the region below the outer focal point (15) of the vertical ellipse (13), g) the objective (22) has a basic shape symmetrical of rotation.
2. Headlamp according to Claim 1, characterised by: h) the incandescent coil (17) is located with its centre of gravity in front of the inner focal point (14) of the vertical meridian (12) in the ray direction (19).
3. Headlamp according to Claim 1 or 2, characterised by: i) the axis of rotation (23) of the objective (22) is arranged beneath and parallel to the optical axis (16).
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Dipped light headlamp for motor vehicles The invention relates to a dipped light headlamp for motor vehicles according to the precharacterising clause of Claim 1. Headlamps of this type are known, inter alia as so-called parabolicelliptical, polyelliptical or triaxial ellipsoids, in which at least the vertical meridian of the reflector is a part of an ellipse and also exhibits an inner and an outer focal point. These headlamps have various optical advantages compared to headlamps constructed with a paraboloid reflector. However, here again that part of the crude light beam which is shaded off by the shutter is not utilised optically, and the efficiency in this respect is also not improved. Various proposals have been made to utilise optically the shaded out part of the crude light beam and thereby to improve the efficiency, however they did not find acceptance in practice, whether due to an unfavourable cost to usefulness ratio orto high temperatures in the region of the shutter. The efficiency of the headlamp is considerably improved by the features of Claim 1, mainly without additional technical outlay, by a modified arrangement of the components which are present in any case, without utilising the shaded out part of the crude light beam. By feature e), the zone of greatest brightness is shifted upwards in a projected image (test screen) and an improvement of efficiency is thereby achieved. By feature f), the light-dark limit is displaced upwards and produces an enlargement of the visible part of the crude light beam. Advantageous further developments of the invention are described in the subordinate Claims. By feature h), the dipped light beam is fanned more intensely sideways (speading, lateral scatter). By feature i), it is achieved that the objective encompasses the entire crude light beam. By the conjoint displacement of the shutter and of the objective according to feature j), on the one hand the overall depth, that is to say the overall length relative to the x-axis referred to the system, is considerably shortened, and on the other hand the objective is brought closer to the light source (incandescent coil), whereby-for equal diameter of the objective-the angular lateral illumination is further improved. The above-mentioned advantages are achieved particularly by the use of an axial coil according to feature k), and by its arrangement according to feature 1). An exemplary embodiment of the invention is illustrated in the drawing and described more fully in the description of the Figures, wherein: Fig. 1 shows the diagrammate arrangement, not drawn to scale, of a dipped light headlamp for motor vehicles in vertical section; and Fig. 2 shows the image of the crude light beam cast upon a test screen. Description of the Exemplary Embodiment A motor vehicle headlamp for generating the dipped light for motor vehicles in Fig. 1 has a reflector 10, the horizontal meridian of which is a part of an ellipse of greater focal length, and the vertical meridian 12 of which is a part of an ellipse 13 of shorter focal length having the inner focal point 14 and the outer focal point 15. Both the focal points 14 and 15 lie upon the optical axis 16 (reflector axis, system axis) in which the horizontal and vertical meridians 11,12 intersect. An incandescent coil 17 is constructed as an axial coil (longitudinal coil), which is arranged with its centre of gravity in front of the inner focal point 14 and in the direction 19 of the reflected rays. The spiral axis 18 is located parallel to the optical axis 16, and a shutter 20 with an optically effective edge 21 is arranged beneath the focal point 15 and counter to the ray direction 19 so that the crude light beam is formed with the light-dark limit (Fig. 2). An objective 22 is constructed symmetrically of rotation with the axis of rotation 23, which is oriented beneath and parallel to the optical axis 16. The interval of the objective 22 from the shutter 20 is determined by the required sharpness (blurring) of the dipped light beam which the objective 22 forms from the crude light beam. Fig. 2 shows by sectors a test screen 24 used for testing the law with the dipped light beam 25 formed by the objective 22 (Fig. 1), in which isolux lines 26 (lines of equal brightness) are plotted. That part of the reflected light rays shaded out by the shutter 20 (Fig. 1) is designated 20', and the edge 21 of the shutter 20 forms a light-dark limit 21' of the shuttered light beam 25. W is the vertical plane and HH is the horizontal plane, relative to which the light beam 25 is to be adjusted. In order to obtain the adjustment illustrated, it is necessary interalia for the optical axis 16 (Fig. 1) to be inclined downwards into the new position 16'. CLAIMS
1. Dipped light headlamp for motor vehicles with: a) a reflector, the vertical meridian of which is a part of an ellipse, and at least the horizontal meridian of which is a part of a conic section line, b) an incandescent coil is arranged in the region of the inner focal point of the vertical meridian, c) a shutter having an optically effective edge forms the crude light beam with the light-dark limit, d) an objective is arranged in the ray path of the crude light beam and forms the dipped light beam, characterised by:: e) the incandescent coil (17) is located above the innerfocal point (14) ofthevertical meridian (12),f) the edge (21) of the shutter (20) is arranged in the region below the outer focal point (15) of the vertical ellipse (13), g) the objective (22) has a basic shape symmetrical of rotation.
2. Headlamp according to Claim 1, characterised by: h) the incandescent coil (17) is located with its centre of gravity in front of the inner focal point (14) of the vertical meridian (12) in the ray direction (19).
3. Headlamp according to Claim 1 or 2, characterised by: i) the axis of rotation (23) of the objective (22) is arranged beneath and parallel to the optical axis (16).
4. Headlamp according to any of the abovementioned Claims, characterised by: j) the shutter (20) having the optically effective edge (21) is arranged behind the outer focal point (15) counter to the ray direction (19) relative thereto.
5. Headlamp according to any of the abovementioned claims, characterised by: k) the incandescent coil (17) is constructed as an axial coil (longitudinal coil), I) the coil axis (18) of the incandescent coil), is arranged parallel to the optical axis (16) of the reflector (10) and/or of the headlamp.
6. A headlamp substantially as herein described with reference to the accompanying drawing.
GB08426250A 1983-11-11 1984-10-17 Dipped light headlamp for motor vehicles Expired GB2149489B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19833340796 DE3340796A1 (en) 1983-11-11 1983-11-11 LOW BEAM HEADLIGHTS FOR MOTOR VEHICLES

Publications (3)

Publication Number Publication Date
GB8426250D0 GB8426250D0 (en) 1984-11-21
GB2149489A true GB2149489A (en) 1985-06-12
GB2149489B GB2149489B (en) 1987-07-08

Family

ID=6214051

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08426250A Expired GB2149489B (en) 1983-11-11 1984-10-17 Dipped light headlamp for motor vehicles

Country Status (5)

Country Link
JP (1) JPH063681B2 (en)
DE (1) DE3340796A1 (en)
GB (1) GB2149489B (en)
IT (1) IT1178633B (en)
SE (1) SE447016B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2600401A1 (en) * 1986-06-20 1987-12-24 Bosch Gmbh Robert DIAPHRAGM PROJECTOR, ESPECIALLY FOR MOTORIZED VEHICLES

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2566878B1 (en) * 1984-06-27 1986-07-18 Cibie Projecteurs IMPROVEMENTS ON AUTOMOTIVE PROJECTORS EMITTING A CUTTING BEAM, ESPECIALLY A CROSSING BEAM
JPH0789445B2 (en) * 1986-02-10 1995-09-27 市光工業株式会社 Projector headlight
US4825343A (en) * 1985-12-27 1989-04-25 Ichikoh Industries Limited Projector type headlamp for vehicles
KR920002682B1 (en) * 1987-03-11 1992-03-31 이스트만 코닥 컴퍼니 Vehicular headlight and method of producing an optically effective system of same
JPH0514404Y2 (en) * 1988-09-27 1993-04-16
CN102089854B (en) * 2008-07-07 2014-06-25 皇家飞利浦电子股份有限公司 Lamp

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB340904A (en) * 1930-04-14 1931-01-08 Mary Emeline Blackwood Improved means for preventing head light dazzle of motor road vehicles
GB441527A (en) * 1935-06-04 1936-01-21 John Day An improved vehicle head-lamp
GB1141984A (en) * 1966-02-11 1969-02-05 Claudine Marie Madeleine Wyss Motor vehicle headlights having single filament bulbs
GB2102934A (en) * 1981-07-10 1983-02-09 Cibie Projecteurs Dipped headlamp for vehicles
EP0089289A1 (en) * 1982-03-15 1983-09-21 Armand Laribe Headlamps for motor vehicles
GB2117502A (en) * 1981-12-08 1983-10-12 Bosch Gmbh Robert A headlamp for motor vehicles

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB178388A (en) * 1921-01-04 1922-04-04 Duncan James Ritchie Improvements in headlamps for automobiles
DE2125646A1 (en) * 1971-05-24 1972-12-14 Freitag J Automotive headlights
JPS5149584A (en) * 1975-07-07 1976-04-28 Tokyo Shibaura Electric Co
JPS58103701A (en) * 1981-12-08 1983-06-20 ロ−ベルト・ボツシユ・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング Headlight for automobile

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB340904A (en) * 1930-04-14 1931-01-08 Mary Emeline Blackwood Improved means for preventing head light dazzle of motor road vehicles
GB441527A (en) * 1935-06-04 1936-01-21 John Day An improved vehicle head-lamp
GB1141984A (en) * 1966-02-11 1969-02-05 Claudine Marie Madeleine Wyss Motor vehicle headlights having single filament bulbs
GB2102934A (en) * 1981-07-10 1983-02-09 Cibie Projecteurs Dipped headlamp for vehicles
GB2117502A (en) * 1981-12-08 1983-10-12 Bosch Gmbh Robert A headlamp for motor vehicles
EP0089289A1 (en) * 1982-03-15 1983-09-21 Armand Laribe Headlamps for motor vehicles

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2600401A1 (en) * 1986-06-20 1987-12-24 Bosch Gmbh Robert DIAPHRAGM PROJECTOR, ESPECIALLY FOR MOTORIZED VEHICLES

Also Published As

Publication number Publication date
DE3340796C2 (en) 1992-09-10
GB8426250D0 (en) 1984-11-21
IT1178633B (en) 1987-09-09
IT8423494A0 (en) 1984-11-08
DE3340796A1 (en) 1985-05-23
GB2149489B (en) 1987-07-08
SE8405622D0 (en) 1984-11-09
SE8405622L (en) 1985-05-12
SE447016B (en) 1986-10-20
JPH063681B2 (en) 1994-01-12
JPS60119001A (en) 1985-06-26

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