GB413572A - Improvements in or relating to screens for the reception of optically projected images - Google Patents
Improvements in or relating to screens for the reception of optically projected imagesInfo
- Publication number
- GB413572A GB413572A GB3566333A GB3566333A GB413572A GB 413572 A GB413572 A GB 413572A GB 3566333 A GB3566333 A GB 3566333A GB 3566333 A GB3566333 A GB 3566333A GB 413572 A GB413572 A GB 413572A
- Authority
- GB
- United Kingdom
- Prior art keywords
- elements
- coloured
- screens
- colours
- relating
- 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
- G03B21/567—Projection screens for colour projection
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Paper (AREA)
Abstract
413,572. Projection screens. ANDERSEN, A. C., 50, Set. Knudsvej, Copenhagen. Dec. 19, 1933, No. 35663. Drawings to Specification. [Class 97 (i).] The surface of a projection screen is divided into differently coloured elements of uniform size, shape, and arrangement, the elements being so small as not to be individually distinguishable from the normal position of a spectator. The colours may be printed on a white paper base, or the screen may be woven with coloured threads. The elements may be alternately arranged red and green squares, red, blue, and yellow hexagons, or other coloured polygons. Their colours may be complementary or such as to produce a slight preponderance of one colour. The elements may be separated by dark lines, and perforations for sound transmission may be provided in the separating lines.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3566333A GB413572A (en) | 1933-12-19 | 1933-12-19 | Improvements in or relating to screens for the reception of optically projected images |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3566333A GB413572A (en) | 1933-12-19 | 1933-12-19 | Improvements in or relating to screens for the reception of optically projected images |
Publications (1)
Publication Number | Publication Date |
---|---|
GB413572A true GB413572A (en) | 1934-07-19 |
Family
ID=10380201
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3566333A Expired GB413572A (en) | 1933-12-19 | 1933-12-19 | Improvements in or relating to screens for the reception of optically projected images |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB413572A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0421809A2 (en) * | 1989-10-05 | 1991-04-10 | THORN EMI plc | A screen and projector for use in a front projection system |
WO2002048790A1 (en) * | 2000-12-11 | 2002-06-20 | Seppo Lappalainen | Projection surface |
-
1933
- 1933-12-19 GB GB3566333A patent/GB413572A/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0421809A2 (en) * | 1989-10-05 | 1991-04-10 | THORN EMI plc | A screen and projector for use in a front projection system |
EP0421809A3 (en) * | 1989-10-05 | 1992-04-08 | Thorn Emi Plc | A screen and projector for use in a front projection system |
US5193015A (en) * | 1989-10-05 | 1993-03-09 | Thorn Emi Plc | Cholesteric liquid crystal screen which reflects substantially all of the projected light |
WO2002048790A1 (en) * | 2000-12-11 | 2002-06-20 | Seppo Lappalainen | Projection surface |
US6980361B2 (en) | 2000-12-11 | 2005-12-27 | Seppo Lappalainen | Projection surface |
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