GB1347357A - Motor vehicle headlamps - Google Patents
Motor vehicle headlampsInfo
- Publication number
- GB1347357A GB1347357A GB2642871*A GB2642871A GB1347357A GB 1347357 A GB1347357 A GB 1347357A GB 2642871 A GB2642871 A GB 2642871A GB 1347357 A GB1347357 A GB 1347357A
- Authority
- GB
- United Kingdom
- Prior art keywords
- horizontal
- prismatic
- cover glass
- lamp
- reflector
- 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
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
- F21S41/28—Cover glass
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
Abstract
1347357 Motor vehicle headlamps CIBIE PROJECTEURS 19 April 1971 [14 May 1970] 26428/71 Heading F4R A dipped-beam motor vehicle headlamp comprising a parabolic reflector, a light source having a filament located in the vicinity of the principal focus of the reflector and masking means so associated with the filament that without further optical means the light emitted by the headlamp would be bounded by a single upper horizontal plane, is also provided with a number of prismatic reflecting or refractory surfaces which cause part of the emitted light to be deflected upwards and horizontally away from the central axis of the lamp so that the emitted light is bounded at its upper surface by two horizontal half-planes AB, CD on either side of the central axis which are of different heights and are joined by an inclined planar segment BD. The half-plane of greater height DC, coinciding with the horizontal plane through the central axis H of the lamp, is directed to the near-side of the roadway and the inclined plane is preferably inclined at an angle of 45 degrees. The prismatic surfaces are preferably moulded into the surface of the cover glass for the lamp, though they may alternatively be preformed and secured to the inner surface of the cover glass by adhesive or they may be located between the cover glass and the reflector. Alternatively suitable prismatic formations may be made in the surface of the reflector. Fig. 4 shows a front view of a headlamp designed for use with a light source having an axial filament partially surrounded by a hemicylindrical mask. The prismatic formations are arranged on the horizontal axis of the cover glass; the line of greatest slope of each prismatic formation is inclined both to its horizontal and vertical edges so as to produce the appropriate horizontal and vertical displacement of the beam. In the case of a lamp using a source having a horizontal transverse filament the prismatic formations are arranged adjacent to the vertical axis of the cover glass, Fig. 7 (not shown).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7017586A FR2087317A5 (en) | 1970-05-14 | 1970-05-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1347357A true GB1347357A (en) | 1974-02-27 |
Family
ID=9055522
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2642871*A Expired GB1347357A (en) | 1970-05-14 | 1971-04-19 | Motor vehicle headlamps |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US3858040A (en) |
| JP (1) | JPS555201B1 (en) |
| DE (1) | DE2123844C3 (en) |
| FR (1) | FR2087317A5 (en) |
| GB (1) | GB1347357A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2810670A1 (en) * | 1978-03-11 | 1979-09-13 | Westfaelische Metall Industrie | Vehicle headlight unit with prismatic lens - has divided prisms ensuring correct light intensity in all zones |
| GB2121947A (en) * | 1982-06-09 | 1984-01-04 | Cibie Projecteurs | Dipped headlamp for automobiles |
| GB2311364A (en) * | 1996-03-20 | 1997-09-24 | Bosch Gmbh Robert | Low beam headlamp for vehicles |
| GB2510652A (en) * | 2013-02-07 | 2014-08-13 | Paul Ivor Harper | Method for fitting a vehicle headlamp converter |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2256369B2 (en) * | 1973-12-26 | 1976-04-30 | Cibie Projecteurs | |
| US4173034A (en) * | 1977-04-01 | 1979-10-30 | Schemitz Sylvan R | Lighting system with baffle |
| FR2392322A1 (en) * | 1977-05-25 | 1978-12-22 | Ducellier & Cie | PROCESS FOR OBTAINING A NEW CROSSING BEAM |
| US4246631A (en) * | 1978-05-23 | 1981-01-20 | Lucas Industries Limited | Vehicle headlamp |
| CS229071B1 (en) * | 1981-10-28 | 1984-05-14 | Milan Cejnek | Headlight for motor vehicles |
| FR2536502B1 (en) * | 1982-11-19 | 1987-01-09 | Cibie Projecteurs | CROSSING PROJECTOR FOR MOTOR VEHICLE |
| FR2583139B1 (en) * | 1985-06-07 | 1989-02-03 | Cibie Projecteurs | CROSSING PROJECTOR FOR MOTOR VEHICLE |
| DE3531224A1 (en) * | 1985-08-31 | 1987-03-05 | Bosch Gmbh Robert | HEADLIGHTS FOR LOW BEAM OR FOG LIGHTS OF MOTOR VEHICLES |
| JP2622564B2 (en) * | 1986-12-30 | 1997-06-18 | ヴァレオ ヴイジョン | Automotive headlamp with deformed bottom that emits a beam defined by a cut-off |
| GB8927903D0 (en) * | 1989-12-09 | 1990-02-14 | Carello Lighting Plc | Lamp assembly |
| FR2732747B1 (en) * | 1995-04-06 | 1997-06-20 | Valeo Vision | MOTOR VEHICLE PROJECTOR CAPABLE OF TRANSMITTING A BEAM DELIMITED BY A CUT TO TWO HALF PLANS OFFSET IN HEIGHT |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1322776A (en) * | 1919-11-25 | And frederick p | ||
| US1430580A (en) * | 1920-12-31 | 1922-10-03 | Old James Harlan | Lens |
| US1916514A (en) * | 1931-05-09 | 1933-07-04 | Guide Lamp Corp | Auxiliary driving light |
| US1950978A (en) * | 1932-12-07 | 1934-03-13 | Gen Motors Corp | Lens for head lamps |
| US2122465A (en) * | 1934-03-20 | 1938-07-05 | Graves Arnold | Light-projection system particularly for vehicle lamps |
| US2142964A (en) * | 1935-11-27 | 1939-01-03 | United Lens Corp | Head lamp and lens construction |
-
1970
- 1970-05-14 FR FR7017586A patent/FR2087317A5/fr not_active Expired
-
1971
- 1971-04-19 GB GB2642871*A patent/GB1347357A/en not_active Expired
- 1971-05-13 DE DE2123844A patent/DE2123844C3/en not_active Expired
- 1971-05-14 JP JP3290071A patent/JPS555201B1/ja active Pending
-
1973
- 1973-07-23 US US00381555A patent/US3858040A/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2810670A1 (en) * | 1978-03-11 | 1979-09-13 | Westfaelische Metall Industrie | Vehicle headlight unit with prismatic lens - has divided prisms ensuring correct light intensity in all zones |
| GB2121947A (en) * | 1982-06-09 | 1984-01-04 | Cibie Projecteurs | Dipped headlamp for automobiles |
| GB2311364A (en) * | 1996-03-20 | 1997-09-24 | Bosch Gmbh Robert | Low beam headlamp for vehicles |
| GB2311364B (en) * | 1996-03-20 | 1998-04-29 | Bosch Gmbh Robert | Low beam headlamp for vehicles |
| GB2510652A (en) * | 2013-02-07 | 2014-08-13 | Paul Ivor Harper | Method for fitting a vehicle headlamp converter |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2123844B2 (en) | 1975-05-07 |
| US3858040A (en) | 1974-12-31 |
| DE2123844A1 (en) | 1971-11-18 |
| JPS555201B1 (en) | 1980-02-05 |
| FR2087317A5 (en) | 1971-12-31 |
| DE2123844C3 (en) | 1975-12-11 |
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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 |