GB1513148A - Polarization headlamps - Google Patents
Polarization headlampsInfo
- Publication number
- GB1513148A GB1513148A GB22478/75A GB2247875A GB1513148A GB 1513148 A GB1513148 A GB 1513148A GB 22478/75 A GB22478/75 A GB 22478/75A GB 2247875 A GB2247875 A GB 2247875A GB 1513148 A GB1513148 A GB 1513148A
- Authority
- GB
- United Kingdom
- Prior art keywords
- polarizer
- mirror
- polarization
- light
- films
- 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
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/12—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of emitted light
- F21S41/135—Polarised
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Polarising Elements (AREA)
Abstract
1513148 Vehicle headlamps ROBERT BOSCH GmbH 23 May 1975 [24 Oct 1974] 22478/75 Heading F4R A polarized headlamp comprises a light source not shown, disposed at the focus F o of a parabolic mirror 10 and an interference polarizer 12 arranged across the mouth of the mirror, the polarizer having a series of ridges or steps 121- 132 and means being provided for rotating the direction of polarization of that component of the light which is reflected by the polarizer back towards the mirror and is returned by the mirror to the polarizer. The light reflected by the polarizer is polarized at 90 degrees to the direction of polarization of the light transmitted by the polarizer, and the rotation may be effected by two #/2 films F 1 , F 2 which are semicircular in shape and are dispoed over the upper and lower halves, respectively, of the polarizer. The polarizer is encased in glass bodies 9a, 9b and the front of the lamp is covered by an absorption polarizer P. In a modification (Fig. 2, not shown) the two #/2 films are superimposed in the upper half of the lamp. In an alternative embodiment (Figs. 3 and 4, not shown) the upper half (12a) of the interference polarizer has horizontal ridges and the lower half (12b) has vertical ridges, the #/2 films being disposed on the side of the polarizer remote from the mirror so that all the emitted light has 45 degrees polarization. Reference has been directed by the Comptroller to Specification 1,421,404.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19742450457 DE2450457A1 (en) | 1974-10-24 | 1974-10-24 | POLARIZING HEADLIGHTS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1513148A true GB1513148A (en) | 1978-06-07 |
Family
ID=5929012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB22478/75A Expired GB1513148A (en) | 1974-10-24 | 1975-05-23 | Polarization headlamps |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE2450457A1 (en) |
| FR (1) | FR2289841A1 (en) |
| GB (1) | GB1513148A (en) |
| IT (1) | IT1043622B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3010266A1 (en) * | 1980-03-18 | 1981-09-24 | Gyözö 7500 Karlsruhe Schubert | Antidazzle system using magnetic compass - rotating optical polarisers of two vehicles approaching each other until orthogonal |
-
1974
- 1974-10-24 DE DE19742450457 patent/DE2450457A1/en active Pending
-
1975
- 1975-05-23 GB GB22478/75A patent/GB1513148A/en not_active Expired
- 1975-10-23 IT IT28622/75A patent/IT1043622B/en active
- 1975-10-24 FR FR7532677A patent/FR2289841A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| FR2289841A1 (en) | 1976-05-28 |
| IT1043622B (en) | 1980-02-29 |
| DE2450457A1 (en) | 1976-05-06 |
| FR2289841B1 (en) | 1980-01-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed |