GB429340A - Optical device suitable for selectively transmitting non-parallel light rays - Google Patents
Optical device suitable for selectively transmitting non-parallel light raysInfo
- 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
Links
- 230000003287 optical effect Effects 0.000 title abstract 2
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 230000004313 glare Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
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.
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)
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 |
-
1933
- 1933-08-25 GB GB2094633A patent/GB429340A/en not_active Expired
Cited By (15)
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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