GB429340A - Optical device suitable for selectively transmitting non-parallel light rays - Google Patents

Optical device suitable for selectively transmitting non-parallel light rays

Info

Publication number
GB429340A
GB429340A GB2094633A GB2094633A GB429340A GB 429340 A GB429340 A GB 429340A GB 2094633 A GB2094633 A GB 2094633A GB 2094633 A GB2094633 A GB 2094633A GB 429340 A GB429340 A GB 429340A
Authority
GB
United Kingdom
Prior art keywords
faces
prisms
face
light
ray
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
GB2094633A
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.)
ANDRIES CARL CILLIERS
Original Assignee
ANDRIES CARL CILLIERS
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 ANDRIES CARL CILLIERS filed Critical ANDRIES CARL CILLIERS
Priority to GB2094633A priority Critical patent/GB429340A/en
Publication of GB429340A publication Critical patent/GB429340A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/14—Mirrors; Prisms
    • 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
    • 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
    • F21S41/285—Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24 - F21S41/2805
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/10—Filters, e.g. for facilitating adaptation of the eyes to the dark; Sunglasses
    • G02C7/105—Filters, e.g. for facilitating adaptation of the eyes to the dark; Sunglasses having inhomogeneously distributed colouring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2107/00—Use or application of lighting devices on or in particular types of vehicles
    • F21W2107/10—Use or application of lighting devices on or in particular types of vehicles for land vehicles

Landscapes

  • Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Light Control Or Optical Switches (AREA)

Abstract

429,340. Vehicle anti-dazzle screens. CILLIERS, A. C., University of Stellenbosch, Stellenbosch, Cape Province, South Africa. Aug. 25, 1933, No. 20946. [Class 103 (ii)] [See also Groups XX, X, XI, and XVIII] An optical device for modifying a beam of light consists of a transparent plate comprising a series of similar prisms having their light-entrance and light-exit faces respectively parallel with one another, transparent means spaced from the exit faces to recompose the rays leaving the said faces, a rarer transparent medium between the exit faces and the recomposing means, and means at the third faces of the prisms to intercept light rays reaching the said faces. In the form shown the plate 5 consists of a number of prisms 7 having a common light-entrance face 9 and parallel light-exit faces 10, and the recomposing means consists of a plate 6 having a series of prisms 8 inverted relatively to, and interdigitated with, the prisms 7. Air spaces 14 are left between the exit faces 10 of the prisms 7 and the entrance faces 12 of the prisms 8. Light-intercepting means are provided at the base faces 20, 21 of the prisms to prevent the passage of light across the faces, for example the faces 21 may be silvered or the faces 20 coated, or a strip of material 22 may be inserted between the faces, the coating or strip being continued around the angles 23 and being either opaque or translucent and coloured. A ray such as 19 incident on the face 9 in such a direction that it becomes incident on the face 10 at an angle greater than the critical angle is totally reflected at the face 10, and a ray such as 15 incident on the face 10 at an angle less than the critical angle is refracted at the said face and emerges from the plate 6 as a ray 15<a> parallel to the ray 15. If the refracting angle a of the prisms is equal to the critical angle and the face 9 is vertical, then all upwardly-inclined rays incident on the face 9 will undergo total reflection at the faces 10. The device may be used as a visor through which the driver of a vehicle looks to prevent glare from the lights of oncoming vehicles, the visor being mounted so as to be rotatable about an axis parallel to the refracting edges of the prisms so that the limiting inclination of transmitted rays can be varied.
GB2094633A 1933-08-25 1933-08-25 Optical device suitable for selectively transmitting non-parallel light rays Expired GB429340A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2094633A GB429340A (en) 1933-08-25 1933-08-25 Optical device suitable for selectively transmitting non-parallel light rays

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2094633A GB429340A (en) 1933-08-25 1933-08-25 Optical device suitable for selectively transmitting non-parallel light rays

Publications (1)

Publication Number Publication Date
GB429340A true GB429340A (en) 1935-05-27

Family

ID=10154505

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2094633A Expired GB429340A (en) 1933-08-25 1933-08-25 Optical device suitable for selectively transmitting non-parallel light rays

Country Status (1)

Country Link
GB (1) GB429340A (en)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2722862A (en) * 1949-09-12 1955-11-08 Otto G Schwede Angular discriminating optical device
US2731872A (en) * 1956-01-24 schwede
US2878714A (en) * 1956-10-30 1959-03-24 John W Van Denburg Glare reducing device
US2963936A (en) * 1952-11-06 1960-12-13 Gen Motors Corp Rear vision means having prismatic window
US2976759A (en) * 1958-07-30 1961-03-28 Keith T Bleuer Anti-glare device for vehicles
US3004470A (en) * 1956-07-28 1961-10-17 Zeiss Ikon A G Stuttgart Multiple focal length lens
US3134021A (en) * 1959-08-01 1964-05-19 Zeiss Ikon Ag Photoelectric exposure meters with light ray limiters
US3393034A (en) * 1964-05-25 1968-07-16 Imai Senzo Light transmitting panel
US3438699A (en) * 1965-10-21 1969-04-15 Bernard I Seeger Optical control of sunlight at window and door openings with controlled positioning of composite transparent materials to eliminate glaring sunlight rays while providing normal daylight illumination
US3791722A (en) * 1972-01-12 1974-02-12 Minnesota Mining & Mfg Lenses
US4146306A (en) * 1977-06-27 1979-03-27 Wallach David L Optical lens
US4514040A (en) * 1982-03-11 1985-04-30 Societa' Italiana Vetro-Siv-S.P.A. Prismatic refractor for concentrating solar energy on a suitable collecting surface, of fixed position with respect to time
US4669034A (en) * 1985-02-13 1987-05-26 Semperlux Gmbh Non-glare device for large surface light emitting means
GB2385627A (en) * 2002-02-23 2003-08-27 Duncan Mchardy Window with triangular prisms
GB2443189A (en) * 2006-10-27 2008-04-30 Jonathan Adam Kalmus One way viewing partition

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2731872A (en) * 1956-01-24 schwede
US2722862A (en) * 1949-09-12 1955-11-08 Otto G Schwede Angular discriminating optical device
US2963936A (en) * 1952-11-06 1960-12-13 Gen Motors Corp Rear vision means having prismatic window
US3004470A (en) * 1956-07-28 1961-10-17 Zeiss Ikon A G Stuttgart Multiple focal length lens
US2878714A (en) * 1956-10-30 1959-03-24 John W Van Denburg Glare reducing device
US2976759A (en) * 1958-07-30 1961-03-28 Keith T Bleuer Anti-glare device for vehicles
US3134021A (en) * 1959-08-01 1964-05-19 Zeiss Ikon Ag Photoelectric exposure meters with light ray limiters
US3393034A (en) * 1964-05-25 1968-07-16 Imai Senzo Light transmitting panel
US3438699A (en) * 1965-10-21 1969-04-15 Bernard I Seeger Optical control of sunlight at window and door openings with controlled positioning of composite transparent materials to eliminate glaring sunlight rays while providing normal daylight illumination
US3791722A (en) * 1972-01-12 1974-02-12 Minnesota Mining & Mfg Lenses
US4146306A (en) * 1977-06-27 1979-03-27 Wallach David L Optical lens
US4514040A (en) * 1982-03-11 1985-04-30 Societa' Italiana Vetro-Siv-S.P.A. Prismatic refractor for concentrating solar energy on a suitable collecting surface, of fixed position with respect to time
US4669034A (en) * 1985-02-13 1987-05-26 Semperlux Gmbh Non-glare device for large surface light emitting means
GB2385627A (en) * 2002-02-23 2003-08-27 Duncan Mchardy Window with triangular prisms
GB2443189A (en) * 2006-10-27 2008-04-30 Jonathan Adam Kalmus One way viewing partition

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