DE350473C - Locking disc for cinematographs designed as fire protection means - Google Patents
Locking disc for cinematographs designed as fire protection meansInfo
- Publication number
- DE350473C DE350473C DE1920350473D DE350473DD DE350473C DE 350473 C DE350473 C DE 350473C DE 1920350473 D DE1920350473 D DE 1920350473D DE 350473D D DE350473D D DE 350473DD DE 350473 C DE350473 C DE 350473C
- Authority
- DE
- Germany
- Prior art keywords
- designed
- picture window
- cinematographs
- fire protection
- protection means
- 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
- G03B21/14—Details
- G03B21/18—Fire preventing or extinguishing
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Special Wing (AREA)
Description
Als Feuerschutzmittel ausgebildete Verschlußscheibe für Kinematographen. Werden Filmteile in stehender Projektion vorgeführt, so muß das im Bildfenster stehende Bildbandstück möglichst ausgedehnt gegen die Wärmewirkung der Lichtquelle geschützt werden. In weitestem Maße scheint eine Vorrichtung dieser Aufgabe gerecht werden zu können, die in sich die Verschlußscheibe zum Abdecken des Bildwechsels und kurzem Verdunkeln des stehenden Bildes mit einem 'Wärmefilter und einer Kühlvorrichtung- für das Bildfenster vereint und zudem sich selbst kühlt. Dies wird dadurch ermöglicht, daß man die als Ventilator ausgebildete, zwischen Kondensor und Bildfenster diesem tunlichst nahe angebrachte umlaufende Verschlußscheibe so ausbildet, daß sie r. den ganzen Strahlengang des Kondensors bis auf das dem Bildfenster zugeordnete Bündel abdeckt, also nur ringförmige Stücke lichtdurchlässig sind, daß 2. die lichtdurchlässigen Teile als Wärmefilter ausgebildet sind, etwa indem sie aus einem die Wärmestrahlen stark absorbierenden, aber lichtdurchlässigen Körper, wie z. B. Eisenoxydulglas, hergestellt sind, daß 3. die lichtundurchlässigen Teile einschließlich der den Verschlußfiügeln entsprechenden Sektoren als Spiegel hergerichtet sind, und daß q.. auf einer Seite der Verschlußscheibe taschenartige Luftfänger aufgesetzt sind, die die sich fangende Luft als Kühlstrom gegen die lichtdurchlässigen Teile leiten.Shutter for cinematographs designed as fire protection means. If parts of the film are shown in a standing projection, it must be in the picture window Part of the illustrated book protected against the heat of the light source as extensively as possible will. To a large extent, a device seems to do justice to this task to be able to use the shutter disc to cover the picture change and briefly Darken the still image with a 'heat filter and cooling device- united for the picture window and also cools itself. This is made possible by that one designed as a fan, between the condenser and the image window as close as possible attached circumferential locking disc so that it r. the entire beam path of the condenser except for the bundle assigned to the image window covers, so only ring-shaped pieces are translucent, that 2. the translucent Parts are designed as heat filters, for example by taking out the heat rays highly absorbent, but translucent body, such as. B. iron oxide glass, are made that 3. the opaque parts including the locking wings corresponding sectors are prepared as a mirror, and that q .. on one side pocket-like air catchers are placed on the closure disc, which catches Direct air as a cooling flow against the translucent parts.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE350473T | 1920-02-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
DE350473C true DE350473C (en) | 1922-03-18 |
Family
ID=6262289
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1920350473D Expired DE350473C (en) | 1920-02-17 | 1920-02-17 | Locking disc for cinematographs designed as fire protection means |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE350473C (en) |
-
1920
- 1920-02-17 DE DE1920350473D patent/DE350473C/en not_active Expired
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