GB1570814A - Headlights for motor vehicles - Google Patents
Headlights for motor vehicles Download PDFInfo
- Publication number
- GB1570814A GB1570814A GB11762/77A GB1176277A GB1570814A GB 1570814 A GB1570814 A GB 1570814A GB 11762/77 A GB11762/77 A GB 11762/77A GB 1176277 A GB1176277 A GB 1176277A GB 1570814 A GB1570814 A GB 1570814A
- Authority
- GB
- United Kingdom
- Prior art keywords
- headlight
- light
- screen
- bulb
- fog
- 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
Links
- 238000005286 illumination Methods 0.000 claims description 12
- 238000009826 distribution Methods 0.000 claims description 10
- 239000006185 dispersion Substances 0.000 claims description 9
- 230000005499 meniscus Effects 0.000 claims description 9
- 230000003287 optical effect Effects 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 2
- 238000012216 screening Methods 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
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
- F21S41/20—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
-
- 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
- F21S41/164—Incandescent light sources, e.g. filament or halogen lamps having two or more filaments
-
- 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
- F21S41/28—Cover glass
-
- 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
- F21S41/285—Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24 - F21S41/2805
-
- 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
- F21S41/40—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
- F21S41/40—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
- 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
- F21S41/435—Hoods or cap-shaped
-
- 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
- F21W2102/30—Fog lights
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Description
(54) IMPROVEMENTS IN OR RELATING TO HEADLIGHTS FOR
MOTOR VEHICLES
(71) We, AUTOPAL, NARODNI
PODNIK, a Czechoslovakian Body Corporate of Novy Jicin, Czechoslovakia, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed to be particularly described in and by the following statement:
This invention relates to headlights for motor vehicles consisting of a concave reflector, a headlight lens, a screen, and the sources of two light bundles, wherein one source is screened by an interior bulb screen to constitute the source of a fog-light beam, whilst the other source is unscreened to constitute the source of a distance light-beam.
The lighting systems for motor vehicles used in this country, particularly the distance light and fog light components of headlight systems, now have to meet internationallyagreed rules laid down by the EEC Committee on Motor Vehicle Traffic. These rules are referred to herein by the abbreviation "ECE", followed by the number of the rule.
For forming the light-beam of a fog light, the heretofore-known headlights use an independent optical system having a singlefilament bulb as the source, whereas for a distance light-beam these headlights make use of a further optical system, having either a single - or a twin-filament bulb as the source. In this way, the combination of both lights into one system has been prevented; consequently bringing about the production of separate headlights of each type for the two illuminating duties. Apart from an unfavourable economic effect, this also complicates the positioning of the double sets of headlights, in particular in case of those to be positioned on vehicles having a low bonnet and a front radiator.A further disadvantage arises from the necessity of maintaining spare bulbs for the additional headlights within the vehicle equipment, the fog light bulbs varying in construction from the bulbs used in the main headlights. An anlogous disadvantage also prevented more extensive use of the proposed headlight system based on a three-filament bulb.
Twin-filament headlamps using type H4 bulbs are known wherein one of the filaments is used to produce the dipped or passing light.
The differences between a fog light and a passing or dipped light are unequivocally specified by the respective ECE regulations.
The differences are in particular that: (a) a fog light is symmetrical whereas the dipped light is not; (b) the inclination of the upper boundary of the fog light below the horizontal line is at least double of that of the dipped light; (c) the lateral diffusion of the fog light is 3 to 5 fold of that of the dipped light; and (d) the light beam component of the fog lamp used to illuminate the roadway edges is more intense than that illuminating intermediate portions thereof, in contradistinction to the dipped light.
The construction of a fog light therefore reflects these differences.
The invention seeks to overcome the disadvantages of the headlights having a twinfilament bulb.
In accordance with the present invention there is provided a headlight for a motor vehicle combining the properties of a distance light and a fog light comprising a reflector, a headlight lens and a twin-filament bulb, one of the filaments being partially screened by an interior bulb screen to constitute the light source of the fog light component of the headlight whilst the other filament is unscreened by the interior bulb screen to constitute the light source of the distance light component of the headlight, wherein each filament is independently operable and is disposed along the optical axis of the reflector, wherein the distance of the nearer ends of both filaments from the reflector focus is less than 3.5 mm, and wherein at least a portion of the upper half of the headlight lens is arranged in form of a negative meniscus (as hereinafter defined).
PreferabIy when the negative meniscus is of a circular section, its focal distance is within the range of from 0.8 to 7 metres.
In one embodiment the interior bulb screen has an asymmetrical cut-out portion and wherein the headlight lens includes a refractory portion extending away from the centre of the reflector towards the far-side edge of the headlight lens, with respect to the direction of traffic, one edge of the reflecting portion being horizontally disposed whilst the other edge lies on a line passing through the centre of the headlight lens at an angle of from 10 to 200 to the horizontal, the said refracting portion comprising either a plurality of vertically disposed band prisms to direct light rays passing through this refracting portion towards the nearside or a single vertical wedge whose base lies in the lower portion of the refracting portion, optionally including at least one vertically disposed lens or prisms, to direct light rays passing through this refracting portion below the horizontal plane passing through the centre of the headlight lens.
In another embodiment the interior bulb screen has an asymmetrical cut-out portion and wherein a circular dispersion screen is positioned on the asymmetrical cut-out side of the interior bulb screen and includes an asymmetrical projection limited by a horizontal plane and by a half-plane, the latter being rotated below the dispersion screen around the optical axis of the reflector by an angle of from 10 to 20 .
By the term "negative meniscus as used herein is meant a concavo-convex lens, i.e. its opposite surfaces are both curved in the same direction, wherein since the radius of curvature of the convex surface is greater than the radius of curvature of the concave surface the focal length of the lens is negative.
A fog light beam formed in this way has in comparison with those of the present fog lights, a greater vertical dispersion, due to the axial positioning of the filament, and also improves the illumination of the carriageway, by virtue of an increase in carriage-way illumination both at the edges thereof, as well as in front of the vehicle. Another improvement is the production of a sharper boundary between light and dark than previously obtained, resulting from an optimal light-beam cut-off, by means of the interior bulb screen, which decreases the danger of blinding the on-coming driver. With this invention, the illuminating fog light beam has, when compared with the existing headlights, a larger light-intensity gradient away from the light/dark boundary, thus improving the homogeneity of the illumination and the penetration of the fog light beam.
The headlight according to the present invention fully complies with ECE 19 in combining the distance and fog lights into one single headlight. This rule states that the upper limit of the fog light beam must be horizontally declined by at least 10 9', whereas the axial luminous intensity of the distance lightbeam must be at least 90% (ECE 1), or 80% (ECE 20) of the maximum luminous intensity of the beam. The mutual positioning of both the light beams is decisively influenced by the position of each filament, with respect to the focal point of the distance and of the fog lights.The position of the filaments may give preference either to a higher axial intensity of the distance beam or to a broader dispersion of the fog light, but by means of the axial arrangement of the two filaments of the headlight of the invention the difficulty of meeting these requirements with a single headlight unit is overcome. In the meniscus area, the fog light beam is focused and refracted towards the optical axis of the light which prevents the forming of an unlit annulus around the axis, a situationwhich is well known with converging light rays, and hence also prevents the forming of a sharp division between light and dark in the fog light beam. In this way, the intensity of the upper portion of the fog light is increased, without its upper limit being moved upwards.However, the distance light beam passing through the meniscus area is refracted upwards, so that the headlight unit fully complies with all the requirements of the ECE rules for distance slights.
The light beam from the distance bulb filament makes use of the whole of the reflective surface of the reflector and, due to the effective application of the fog light design to a part of the headlight lens, the distance light beam is characterised by an extensive sideways dispersion, thus giving a guarentee of good visibility even w en being into very sharp bends. The overall intensity of the distance light beam may also be increased by switching on both filaments. Here an interaction occurs between the two light beams, together with a simultaneous improvement of the side carriage-way illumination, whereby no significant increase in the axial luminous intensity of the distance light beam takes place.
Furthermore, the present invention also solves the problem of using the usual twinfilament asymmetrical bulbs in the headlight of the invention. The bulbs known as "type
R2" as per ECE 1, and the bulbs known as "type H 4", as per ECE 20, which emit an asymmetric beam of light have in their inner bulb screen a cut-out portion through which penetrates a light beam from the dipped headlight filament in an arc of 15 above the horizontal. In order to achieve better defini tion of the upper limit of the fog light beam, the bulb is rotated within the reflector in such a way that the fog light beam passes through the cut-out portion of the bulb screen in an area of from 10 to 20 above the horizontal.
Those light rays passing through the asymmetric portion of headlight which would have been radiated upwards during the headlight operation in a fog are either screened off by means of a projection of the circular dispersion screen at the side of the asymmetric cut-out portion of the bulb screen or, alternatively, are refracted and used with advantage to intensify the carriage-way illumination on the nearside edge thereof. In this latter case, a series of vertical band prisms are arranged suitably within the area of the headlight lens where the light penetrates above the horizontal, whereby these light rays are refracted in a direction towards the edge of the carriage-way.A simple horizontal shift can be achieved using an overall wedge shape which is chamfered in the dowards direction, or this whole area of the headlight lens can comprise both vertical band prisms and lenses, whereby the light rays from this area are lowered and are coupled with the main fog light beam, while at the same time are reflected towards the nearside edge of the carriage-way. Thus, the driver's orientation in a heavy fog and during his approach to sharp bends can be substantially improved, especially with respect to the nearside kerb.
One embodiment of the present invention will now be described, by way of example, with reference to the accompanying drawing, in which:
Figure 1 is a front elevational view and a cut-away side elevational view of a headlight according to the invention.
Figure 2 is a diagrammatic representation of the distribution of light from the fog light component of the headlight of Figure 1;
Figure 3 is a diagrammatic representation of the distribution of light from the distance light component of the headlight of Figure 1.
In Figure 1 the headlight assembly consists of a concave reflector 2, a headlight lens 3, a screen 7 and a bulb 1. A filament 6 in the bulb I, which is screened by the interior bulb screen 5, acts as the light source for the fog light component of the headlight of the invention, whilst filament 4 which is unscreened acts as the light source of the distance light component of the headlight of the invention.
A portion (not shown) of the upper half ofthe lens 3 is formed as a negative meniscus (as hereinbefore defined).
The screen 7 consists of a bowl-shaped member shown in Figure 1 in cross-section as having a "L-shaped" profile and of a holdin arm to which it is secured either mechani ca y or by spot-welding. The entire screen assembly which is indicated by reference numeral 7 is affixed to the reflector e.g. by riveting. The bowl-shaped member is substantially symmetrical about its axis of rotation and is designed to screen off all light coming direct from the bulb filament 6 above the horizontal plane. The screening function of the arm is negligible since its surface when viewed in a frontal projection - is only given by the thickness of the material.
The headlight lens 3 includes an area marked Q for when an asymmetric bulb is used, wherein the prism band elements refract the light rays being emitted above the horizontal in the direction of the arrow towards the nearside kerb taken in the direction of the traffic. Figure 2 diagrammaticaly represents the distribution of a fog light being emitted from a filament 6, the upper limit of which beam is declined from the horizontal by at least 10 9'. The path of the light beam passing through the asymmetric cut-out of the interior screen 5 of the bulb 1 is hatch-marked before the actual prism shift out of the area Q of the headlight lens 3 and dash-marked after the shift.Curve 1 shows the variation of luminous intensity with respect to angle to the focal axis for an existing fog light taken in the vertical plane, and curve 2 shows the corresponding variation for a headlight of the present invention. As is evident from the comparison, the headlight of the invention has a lower level of dazzling luminous intensity above the horizontal, and a steeper gradient in luminous intensity across the light/dark divisions whereby the headlight attains an increased effective range and homogeneity of its illumination. By means of a solid line, Figure 3 illustrates the light distribution from filament 4, with points measured in accordance with ECE 1, ECE 8 and ECE 20.The dashed line shows distribution of light from the fog light from filament 6, by means which the illumination of the distant traffic and, in particular, the illumination of the edges of the carriage-way may be increased, thus providing a wide-angled distance light beam which helps to increase the safety of driving a vehicle into bends.
WHAT WE CLAIM IS:
1. A headlight for a motor vehicle combining the properties of a distance light and a fog light comprising a reflector, a headlight lens and a twin-filament bulb, one of the filaments being partially screened by an interior bulb screen to constitute the light source of the fog light component of the headlight whilst the other filament is unscreened by the interior bulb screen to constitute the light source of the distance light component of the headlight, wherein each filament is independently operable and is disposed along the optical axis of the reflector, wherein the distance of the nearer ends of both filaments from the reflector
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (5)
1. A headlight for a motor vehicle combining the properties of a distance light and a fog light comprising a reflector, a headlight lens and a twin-filament bulb, one of the filaments being partially screened by an interior bulb screen to constitute the light source of the fog light component of the headlight whilst the other filament is unscreened by the interior bulb screen to constitute the light source of the distance light component of the headlight, wherein each filament is independently operable and is disposed along the optical axis of the reflector, wherein the distance of the nearer ends of both filaments from the reflector
focus is less than 3.5 mm, and wherein at least a portion of the upper half of the headlight lens is arranged in form of a negative meniscus (as herembefore defined).
2. A headlight as claimed in claim 1 wherein the negative meniscus is in form of the sector of a circle whose focal length is from 0.8 to 7 metres.
3. A headlight as claimed in claim 1 or claim 2 wherein the interior bulb screen has an asymmetrical cut-out portion and wherein the headlight lens includes a refractory portion extending away from the centre of the reflector towards the far-side edge of the headlight lens, with respect to the direction of traffic, one edge of the refracting portion being horizontally disposed whilst the other edge lies on a line passing through the centre of the headlight lens at an angle of from 10 to 200 to the horizontal, the said refracting portion comprising either a plurality of vertically disposed band prisms to direct light rays passing through this refracting portion towards the nearside or a single vertical wedge whose base lies in the lower portion of the refracting portion, optionally including at least one vertically disposed lens or prisms, to direct light rays passing through this refracting portion below the horizontal plane passing through the centre of the headlight lens.
4. A headlight as claimed in claim 1 or claim 2 wherein the interior bulb screen has an asymmetrical cut-out portion and wherein a circular dispersion screen is positioned on the asymmetrical cut-out side of the interior bulb screen and includes an asymmetrical projection limited by a horizontal plane and by a half-plane, the latter being rotated below the dispersion screen around the optical axis of the reflector by an angle of from 10" to 200.
5. A headlight for a motor vehicle substantially as hereinbefore described with reference to and as illustrated in the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CSPV1831/76A CS199055B1 (en) | 1976-03-23 | 1976-03-23 | Hadlight |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1570814A true GB1570814A (en) | 1980-07-09 |
Family
ID=5353661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB11762/77A Expired GB1570814A (en) | 1976-03-23 | 1977-03-21 | Headlights for motor vehicles |
Country Status (6)
| Country | Link |
|---|---|
| CS (1) | CS199055B1 (en) |
| DD (1) | DD129017A1 (en) |
| DE (1) | DE2712322A1 (en) |
| FR (1) | FR2345659A1 (en) |
| GB (1) | GB1570814A (en) |
| IT (1) | IT1076881B (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1071621B (en) * | 1959-12-24 | Robert Bosch G.M.B.H., Stuttgart | Electric vehicle headlight for asymmetrical light distribution | |
| FR1035090A (en) * | 1951-04-04 | 1953-08-14 | Machal Projecteurs | Additional projector for road vehicle lighting |
| DE934991C (en) * | 1954-07-07 | 1955-11-10 | Westfaelische Metall Ind G M B | Fog lights for automobiles |
| DE1110583B (en) * | 1959-04-15 | 1961-07-13 | Fahrzeugelek K Karl Marx Stadt | Diffuser for headlights of motor vehicles with asymmetrical light distribution of the low beam |
| FR79880E (en) * | 1961-05-30 | 1963-02-08 | Bosch Gmbh Robert | Electric headlight for vehicle |
| DE1580276A1 (en) * | 1966-05-20 | 1971-03-25 | Edwin Liebig | Fog light device for car headlights |
| DE1597912A1 (en) * | 1966-11-17 | 1969-11-27 | Autopal Np | Headlights with asymmetrical distribution of the low beam, especially for motor vehicles |
| DE1622004B2 (en) * | 1968-02-08 | 1976-12-23 | Robert Bosch Gmbh, 7000 Stuttgart | VEHICLE HEADLIGHT WITH A HALOGEN TWIN-WIRE LAMP |
-
1976
- 1976-03-23 CS CSPV1831/76A patent/CS199055B1/en unknown
-
1977
- 1977-03-21 DE DE19772712322 patent/DE2712322A1/en not_active Ceased
- 1977-03-21 GB GB11762/77A patent/GB1570814A/en not_active Expired
- 1977-03-22 DD DD7700197988A patent/DD129017A1/en unknown
- 1977-03-22 IT IT21530/77A patent/IT1076881B/en active
- 1977-03-22 FR FR7708529A patent/FR2345659A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| FR2345659A1 (en) | 1977-10-21 |
| DE2712322A1 (en) | 1977-10-06 |
| CS199055B1 (en) | 1980-07-31 |
| FR2345659B1 (en) | 1981-12-18 |
| DD129017A1 (en) | 1977-12-21 |
| IT1076881B (en) | 1985-04-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |