DE293820C - - Google Patents
Info
- Publication number
- DE293820C DE293820C DENDAT293820D DE293820DA DE293820C DE 293820 C DE293820 C DE 293820C DE NDAT293820 D DENDAT293820 D DE NDAT293820D DE 293820D A DE293820D A DE 293820DA DE 293820 C DE293820 C DE 293820C
- Authority
- DE
- Germany
- Prior art keywords
- canvas
- production
- projection
- transparent liquid
- painter
- 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
- 239000007788 liquid Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 229920002160 Celluloid Polymers 0.000 claims description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Inorganic materials [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 2
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 claims description 2
- 239000004568 cement Substances 0.000 claims description 2
- 239000011507 gypsum plaster Substances 0.000 claims description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000000875 corresponding Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Moulds, Cores, Or Mandrels (AREA)
Description
KAISERLICHESIMPERIAL
PATENTAMT.PATENT OFFICE.
Den Gegenstand des Hauptpatents bildet ein Verfahren zur Herstellung von biegsamen Pro jektionsschirmen für diaskopische Projektion, welches sich im wesentlichen dadurch kennzeichnet, daß auf ein straff aufgespanntes Gewebe von gleichförmiger Struktur, z. B. Maler-' leinwand, eine durchsichtige Flüssigkeit in dünner Schicht aufgegossen wird, die nach dem Erstarren von der Leinwand abgelöst wird und dann eine dünne durchsichtige Platte ergibt, die auf der einen Seite vollkommen glatt ist und auf der anderen Seite eine der Struktur der Leinwand entsprechende feine Rasterung aufweist.The subject of the main patent is a process for the production of flexible products projection screens for diascopic projection, which is essentially characterized by that on a tightly stretched fabric of uniform structure, z. B. painter canvas, a transparent liquid is poured in a thin layer, which after as it solidifies, it is detached from the canvas and then a thin transparent plate results, which is perfectly smooth on one side and one of the other on the other The structure of the canvas has a corresponding fine grid.
Versuche haben ergeben, daß es nicht unbedingt notwendig ist, den Projektionsschirm direkt von der Leinwand abzuziehen. Man kann vielmehr auch in der Weise vorgehen, daß man mit Hilfe der straff ausgespannten Leinwand zunächst eine Matrize herstellt und von dieser Matrize dann Abgüsse aus Gummi oder Zelluloid oder aus Zement bzw. Gips herstellt, worauf man von dieser Matrize unter Anwendung des Verfahrens des Hauptpatents, d. h. unter Benutzung einer durchsichtigen Flüssigkeit, den Projektionsschirm erzeugt.Tests have shown that it is not absolutely necessary to use the projection screen peel off directly from the canvas. Rather, one can proceed in the same way that with the help of the tightly stretched canvas, a matrix is first made and from this matrix then castings made of rubber or celluloid or of cement or plaster of paris manufactures what one of this die using the process of the main patent, d. H. using a transparent liquid, creates the projection screen.
Claims (1)
Publications (1)
Publication Number | Publication Date |
---|---|
DE293820C true DE293820C (en) | 1900-01-01 |
Family
ID=548452
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DENDAT293820D Expired DE293820C (en) |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE293820C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7037880B2 (en) | 1996-04-25 | 2006-05-02 | Nissan Chemical Industries, Ltd. | Ethylene derivatives and pesticides containing said derivatives |
-
0
- DE DENDAT293820D patent/DE293820C/de not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7037880B2 (en) | 1996-04-25 | 2006-05-02 | Nissan Chemical Industries, Ltd. | Ethylene derivatives and pesticides containing said derivatives |
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