GB491097A - Improvements in anti-dazzle devices for head lamps - Google Patents

Improvements in anti-dazzle devices for head lamps

Info

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
Application number
GB7216/37A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HUGO SCHNEIDER AG
Original Assignee
HUGO SCHNEIDER AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by HUGO SCHNEIDER AG filed Critical HUGO SCHNEIDER AG
Publication of GB491097A publication Critical patent/GB491097A/en
Expired legal-status Critical Current

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.
GB7216/37A 1936-03-16 1937-03-11 Improvements in anti-dazzle devices for head lamps Expired GB491097A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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