GB178388A - Improvements in headlamps for automobiles - Google Patents
Improvements in headlamps for automobilesInfo
- Publication number
- GB178388A GB178388A GB33990/21A GB3399021A GB178388A GB 178388 A GB178388 A GB 178388A GB 33990/21 A GB33990/21 A GB 33990/21A GB 3399021 A GB3399021 A GB 3399021A GB 178388 A GB178388 A GB 178388A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lens
- light
- reflector
- zone
- transmitted
- 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
- F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
- F21S41/32—Optical layout thereof
- F21S41/33—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature
- F21S41/331—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of complete annular areas
- F21S41/332—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of complete annular areas with continuity at the junction between adjacent areas
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
178,388. Ritchie, D. J. Jan. 4, 1921. Vehicle lamps.- In a head-lamp having a source of light, a reflector and a projecting lens, the central area r<1> of the reflector R is of ellipsoidal form and the zones r<2>, r<3>, r<4> are formed according to one or more curves which lie off the main part r', so as to produce in the beam transmitted by the lens P a region of lesser illumination outside the region of bright illumination produced by the part r<1>, all the light reflected by the reflector being projected through the lens. The zone r' is ellipsoidal, the zone r' conical and the zone r' a curve maintaining the continuity between the adjoining zones. The light in the outer part of the projected beam is transmitted through the central part of the lens and the light in the concentrated region of the beam is transmitted chiefly through the outer zones of the lens.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB33990/21A GB178388A (en) | 1921-01-04 | 1921-01-04 | Improvements in headlamps for automobiles |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB33990/21A GB178388A (en) | 1921-01-04 | 1921-01-04 | Improvements in headlamps for automobiles |
Publications (1)
Publication Number | Publication Date |
---|---|
GB178388A true GB178388A (en) | 1922-04-04 |
Family
ID=10359963
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB33990/21A Expired GB178388A (en) | 1921-01-04 | 1921-01-04 | Improvements in headlamps for automobiles |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB178388A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3340796A1 (en) * | 1983-11-11 | 1985-05-23 | Robert Bosch Gmbh, 7000 Stuttgart | LOW BEAM HEADLIGHTS FOR MOTOR VEHICLES |
WO1992012379A1 (en) * | 1991-01-09 | 1992-07-23 | Robert Bosch Gmbh | Headlamp for motor vehicles |
-
1921
- 1921-01-04 GB GB33990/21A patent/GB178388A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3340796A1 (en) * | 1983-11-11 | 1985-05-23 | Robert Bosch Gmbh, 7000 Stuttgart | LOW BEAM HEADLIGHTS FOR MOTOR VEHICLES |
WO1992012379A1 (en) * | 1991-01-09 | 1992-07-23 | Robert Bosch Gmbh | Headlamp for motor vehicles |
US5400226A (en) * | 1991-01-09 | 1995-03-21 | Robert Bosch Gmbh | Headlamp for motor vehicle |
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