GB491097A - Improvements in anti-dazzle devices for head lamps - Google Patents
Improvements in anti-dazzle devices for head lampsInfo
- Publication number
- GB491097A GB491097A GB7216/37A GB721637A GB491097A GB 491097 A GB491097 A GB 491097A GB 7216/37 A GB7216/37 A GB 7216/37A GB 721637 A GB721637 A GB 721637A GB 491097 A GB491097 A GB 491097A
- Authority
- GB
- United Kingdom
- Prior art keywords
- elements
- sectors
- polarizing
- headlamp
- polarization
- 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)
- Polarising Elements (AREA)
Abstract
491,097. Polarizing devices for headlamps. WIEMER, K., and SCHNEIDER AKT.-GES., H. March 11, 1937, No. 7216. Convention date, March 16, 1936. Addition to 472,232, [Group XI]. [Class 97 (i)] [Also in Group XI] A polarizing element to be disposed, as described in the parent Specification, between the light source and the reflector of a headlamp, is tubular and comprises a plurality of polarizer elements arranged lengthwise with their longitudinal edges in contact with one another, the planes of polarization of the elements making different angles with the optical axis of the headlamp, and the angle changing progressively from one polarizer element to the next by such steps that the aggregate change amounts to 90‹ in each quadrant. The elements may be mounted on a cylindrical or polygonal transparent hollow base. The elements may be of synthetic dichroic foil, which is a transparent film with a thin layer of small crystals of iodoquinine sulphate, the crystals having their polarizing axes substantially parallel. In the form shown, two circular pieces of dichroic foil have each been divided into sectors which are placed around a glass cylinder A. The sectors 1, 2 ... 12 of one circular piece fit between the sectors 13, 14 ... of the other piece, and the planes of polarization are as indicated by the hatching. The elements may alternatively be narrow rectangular plates. Tourmaline plates may be used without a supporting base.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE491097X | 1936-03-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB491097A true GB491097A (en) | 1938-08-26 |
Family
ID=6544221
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7216/37A Expired GB491097A (en) | 1936-03-16 | 1937-03-11 | Improvements in anti-dazzle devices for head lamps |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB491097A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2453379A (en) * | 1943-09-28 | 1948-11-09 | Alvin M Marks | Multiply angle selective polarizer |
US2995981A (en) * | 1954-03-24 | 1961-08-15 | Bernard J Tamarin | Apparatus for displaying vectographic prints |
-
1937
- 1937-03-11 GB GB7216/37A patent/GB491097A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2453379A (en) * | 1943-09-28 | 1948-11-09 | Alvin M Marks | Multiply angle selective polarizer |
US2995981A (en) * | 1954-03-24 | 1961-08-15 | Bernard J Tamarin | Apparatus for displaying vectographic prints |
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