ES184589A1 - IMPROVEMENTS IN DIRECTIONAL SCREENS - Google Patents
IMPROVEMENTS IN DIRECTIONAL SCREENSInfo
- Publication number
- ES184589A1 ES184589A1 ES0184589A ES184589A ES184589A1 ES 184589 A1 ES184589 A1 ES 184589A1 ES 0184589 A ES0184589 A ES 0184589A ES 184589 A ES184589 A ES 184589A ES 184589 A1 ES184589 A1 ES 184589A1
- Authority
- ES
- Spain
- Prior art keywords
- curve
- inclination
- incident light
- slope
- screen
- 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
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/60—Projection screens characterised by the nature of the surface
- G03B21/62—Translucent screens
- G03B21/625—Lenticular translucent screens
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
Perfeccionamientos en pantallas direccionales para transmisión destinadas a usarse en sistemas ópticos lenticuladas total o parcialmente con lenticulaciones cilíndricas paralelas que pueden ser cóncavas o convexas hacia la luz incidente caracterizados porque las lenticulaciones están dispuestas en la superficie de la pantalla dirigida hacia la luz incidente y tiene un contorno en forma de curva por ejemplo de una parábola cuya proporción de cambio de pendiente o inclinación -pasando desde el vértice a la base de la curva y estando representada dicha pendiente o inclinación por el ángulo que una tangente a la curva forma con una normal al plano de la pantalla- decrece rápidamente al principio y luego con mayor lentitud hasta que la parte final se aproxima a una línea recta cuya pendiente o inclinación en la base no es superior al ángulo máximo que la luz incidente forma con la normal al plano de la curva.Improvements in directional screens for transmission intended for use in fully or partially lenticulated optical systems with parallel cylindrical lenticulations that can be concave or convex towards the incident light characterized in that the lenticulations are arranged on the surface of the screen directed towards the incident light and has a contour in the form of a curve, for example, of a parabola whose rate of change in slope or inclination - passing from the vertex to the base of the curve and said slope or inclination being represented by the angle that a tangent to the curve forms with a normal to the plane of the screen- decreases rapidly at the beginning and then more slowly until the final part approaches a straight line whose slope or inclination at the base is not greater than the maximum angle that the incident light forms with the normal to the plane of the screen. curve.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1970247A GB642133A (en) | 1947-07-23 | 1947-07-23 | Directional transmission projection screens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ES184589A1 true ES184589A1 (en) | 1948-12-16 |
Family
ID=10133773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES0184589A Expired ES184589A1 (en) | 1947-07-23 | 1948-07-16 | IMPROVEMENTS IN DIRECTIONAL SCREENS |
Country Status (2)
| Country | Link |
|---|---|
| ES (1) | ES184589A1 (en) |
| GB (1) | GB642133A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1101803B (en) * | 1954-06-28 | 1961-03-09 | Johan Sam Jacobson | Screen for projection |
| DE3162926D1 (en) * | 1980-04-08 | 1984-05-10 | Matsushita Electric Ind Co Ltd | Light-transmitting type screen for a color television projector |
-
1947
- 1947-07-23 GB GB1970247A patent/GB642133A/en not_active Expired
-
1948
- 1948-07-16 ES ES0184589A patent/ES184589A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB642133A (en) | 1950-08-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB423464A (en) | Improvements in light reflectors | |
| ES181370U (en) | Crystal for headlights. (Machine-translation by Google Translate, not legally binding) | |
| SE310157B (en) | ||
| ES184589A1 (en) | IMPROVEMENTS IN DIRECTIONAL SCREENS | |
| ES269597A1 (en) | Light projector | |
| US2542114A (en) | Prismatic dispersion lens | |
| US2311444A (en) | Light projecting device | |
| GB1067731A (en) | Improvements in or relating to projection systems | |
| GB562241A (en) | Optical sighting or viewing devices | |
| GB619360A (en) | Improvements in or relating to semi-transparent reflectors | |
| GB287729A (en) | Improvements in pavement and other lights | |
| US1837147A (en) | Floodlight | |
| US2131442A (en) | Lamp shade | |
| GB435053A (en) | Improvement of optical apparatus for lighthouses | |
| GB332134A (en) | Improvements in optical reflectors for signalling and other purposes | |
| USD87684S (en) | Design for a lamp shade | |
| SU75779A1 (en) | Reflective screen | |
| GB373052A (en) | Improvements in devices emitting intermittent light signals | |
| GB301260A (en) | Improvements relating to light reflecting devices for cycles and the like | |
| GB537896A (en) | Improvements in or relating to lamps | |
| GB426306A (en) | Improvements in reflecting lenses | |
| GB1129862A (en) | Apparatus for reducing the size of a collimated beam of radiant energy | |
| GB782611A (en) | Improvements in or relating to vehicle headlights | |
| GB523534A (en) | Improvements in reflectors for road lighting | |
| GB709562A (en) | Improvements relating to the optical projection of images |