DE271520C - - Google Patents
Info
- Publication number
- DE271520C DE271520C DENDAT271520D DE271520DA DE271520C DE 271520 C DE271520 C DE 271520C DE NDAT271520 D DENDAT271520 D DE NDAT271520D DE 271520D A DE271520D A DE 271520DA DE 271520 C DE271520 C DE 271520C
- Authority
- DE
- Germany
- Prior art keywords
- projection screen
- projection
- metal
- cardboard
- paper
- 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
- 241000031711 Cytophagaceae Species 0.000 claims 1
- 239000002184 metal Substances 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000011521 glass Substances 0.000 description 4
- 229910000906 Bronze Inorganic materials 0.000 description 3
- 239000011324 bead Substances 0.000 description 3
- 239000010974 bronze Substances 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 239000000123 paper Substances 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 2
- -1 canvas Substances 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 231100000486 side effect Toxicity 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Overhead Projectors And Projection Screens (AREA)
Description
Projektionsschirm. Patentiert im Deutschen Reiche vom 26. Juli 1911 ab.Projection screen. Patented in the German Empire on July 26, 1911.
Der Projektionsschirm gemäß der vorliegenden Erfindung soll das Bild klar und deutlich' wiedergeben unter Verwendung von nur geringen Mengen elektrischen Stromes für die Projektion infolge der Verwendung von Glasperlen in geeigneter Körnung.The projection screen according to the present invention is intended to make the image clear and precise reproduce using only small amounts of electric current for the Projection as a result of the use of glass beads with a suitable grain size.
Der Schirm besteht aus einem Grundstoff, wie Papier, Leinwand, Karton, Pappe, Holz ο. dgl., auf welchem Metallstaub, Metallbronze o. dgl.,The screen consists of a basic material such as paper, canvas, cardboard, cardboard, wood ο. like., on which metal dust, metal bronze or the like,
ίο in entsprechender Form aufgebracht, die spiegelnde Fläche ergibt. Zwecks Verminderung des Reflexionsvermögeris wird der soweit fertiggestellte Projektionsschirm mit Glasperlen in entsprechend großer Körnung vermittels eines Bindemittels aufgebracht.ίο applied in the appropriate form, the reflective Area results. In order to reduce the reflectivity, the one that has been completed so far Projection screen with glass beads in a correspondingly large grain size a binder applied.
Je nach der Verwendung des Projektionsschirmes, ob das projizierte Bild von vorn oder auch von der Seite gesehen werden soll, richtet sich die Art der Körnung, und Versuche ergaben, daß, je kleiner die Körnung und je mattwirkender das Bindemittel, welches die Glasteilchen mit dem Spiegel verbindet, sind, um so besser die Seiten wirkung des Projektionsschirmes in- die Erscheinung tritt.Depending on how the screen is used, whether the projected image is from the front or to be seen from the side, depends on the type of grain, and attempts showed that the smaller the grain size and the more matt the binding agent, which The glass particles that connect with the mirror are, the better the side effect of the projection screen appears.
Der Projektionsschirm gemäß der Erfindung hat die bereits angegebenen Vorteile der, guten Wirkungsweise der Projektion sowie des Ersparens von Projektionslicht, und ferner, durch die Verwendung von Metallstaub, Metallbronze oder Metallschliff, welch letztere bedeutend billiger als die bisher verwandten Blattmetalle sind, ist ein derartiger Projektionsschirm auch bedeutend billiger herzustellen als die bisher bekannten Schirme ähnlicher Art.The projection screen according to the invention has the advantages already indicated, the good Effect of the projection and the saving of projection light, and further, by the use of metal dust, metal bronze or ground metal, the latter being significant Such a projection screen is also cheaper than the previously used sheet metals Significantly cheaper to manufacture than the previously known umbrellas of a similar type.
3535
Pate ν τ-AisTsprüch ε:Godfather ν τ-AisTsprch ε:
1. Projektionsschirm, dadurch gekennzeichnet, daß auf eine Unterlage von Papier, Leinwand, Karton, Pappe, Holz 0. dgl. Glasperlen mittels eines geeigneten Klebemittels aufgebracht sind.1. Projection screen, characterized in that on a backing of paper, Canvas, cardboard, cardboard, wood, etc. Glass beads using a suitable adhesive are upset.
2. Proj ektionsschirm nach Anspruch 1, dadurch gekennzeichnet, daß auf die Unterlage von Papier u. dgl. Metallstaub, Metallbronze ο. dgl. aufgebracht ist. -2. projection screen according to claim 1, characterized in that paper and the like metal dust, metal bronze ο. Like. Is applied. -
BERLIN. GEDRUCKT IN DER REICHSDRUCKEREI.BERLIN. PRINTED IN THE REICHSDRUCKEREI.
Claims (1)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE271520C true DE271520C (en) | 1900-01-01 |
Family
ID=528163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT271520D Expired DE271520C (en) |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE271520C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5811488A (en) * | 1996-05-31 | 1998-09-22 | Kuraray Co., Ltd. | Polyvinyl alcohol powder |
-
0
- DE DENDAT271520D patent/DE271520C/de not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5811488A (en) * | 1996-05-31 | 1998-09-22 | Kuraray Co., Ltd. | Polyvinyl alcohol powder |
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