DE523407C - Cinema projector with optical compensation - Google Patents
Cinema projector with optical compensationInfo
- Publication number
- DE523407C DE523407C DEI39808D DEI0039808D DE523407C DE 523407 C DE523407 C DE 523407C DE I39808 D DEI39808 D DE I39808D DE I0039808 D DEI0039808 D DE I0039808D DE 523407 C DE523407 C DE 523407C
- Authority
- DE
- Germany
- Prior art keywords
- optical compensation
- mirror
- roller
- picture
- cinema projector
- 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
- G03B41/00—Special techniques not covered by groups G03B31/00 - G03B39/00; Apparatus therefor
- G03B41/02—Special techniques not covered by groups G03B31/00 - G03B39/00; Apparatus therefor using non-intermittently running film
- G03B41/04—Special techniques not covered by groups G03B31/00 - G03B39/00; Apparatus therefor using non-intermittently running film with optical compensator
- G03B41/10—Special techniques not covered by groups G03B31/00 - G03B39/00; Apparatus therefor using non-intermittently running film with optical compensator with oscillating reflecting member
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Projection Apparatus (AREA)
Description
Bei Kinoprojektoren mit optischem Ausgleich der Bildwanderung durch einen Schwingspiegel zwischen Bildfenster und Objektiv ist es bekannt, diesen Schwingspiegel durch ein Kurvenelement zu steuern. Der Antrieb des Kurvenelements erfolgt dabei zwangsläufig mit dem Antrieb der Transporttrommel. Außerdem ist es bekannt, die optischen Ausgleichsmittel an einer frei drehbaren Zahntrommel anzuordnen, die durch das Bildband selbst, und zwar durch dessen Lochungen, also abhängig von der Perforation, bewegt wird. In der Praxis hat sich gezeigt, daß eine genaue Übereinstimmung der Bildbandbewegung mit der dazu gehörenden Spiegelbewegung durch derartige Antriebsmittel nicht immer erzielt wird. Insbesondere ruft eine geringe Ungenauigkeit in den Abständen der Perforationen oder eine Beschädigung-der Lochun-In the case of cinema projectors with optical compensation of the image wandering through a Oscillating mirror between the image window and the lens is known, this oscillating mirror controlled by a curve element. The drive of the cam element inevitably takes place with the drive of the Transport drum. It is also known to use the optical compensation means a freely rotatable toothed drum to be arranged by the picture book itself, namely is moved through its perforations, i.e. depending on the perforation. In practice has been shown that an exact match of the picture tape movement with the associated mirror movement is not always achieved by such drive means will. In particular, there is a slight inaccuracy in the spacing of the perforations or damage to the perforation
ao gen eine Ungleichförmigkeit in der Bewegung beider Elemente hervor, so daß sichtbare Fehler bei der Projektion entstehen können.ao produce a non-uniformity in the movement of both elements, so that visible Projection errors can occur.
Dieser Übelstand wird dadurch vermieden,This disadvantage is avoided by
daß der Schwingspiegel zwar auch vom BiIdband selbst, gemäß der Erfindung jedoch unabhängig von dessen Perforation gesteuert wird. In einfacher Weise wird dies dadurch erreicht, daß zwischen Bildfenster und Transporttrommel eine ungezahnte Walze angeordnet wird, welche vom Bildband bewegt wird und den Schwingspiegel steuert.that the oscillating mirror is also independent of the image tape itself, but according to the invention is controlled by its perforation. This is done in a simple manner achieved that between the picture window and the transport drum, an toothless roller is arranged, which is moved by the picture tape and controls the oscillating mirror.
In der Zeichnung ist ein optischer Ausgleich dargestellt, an dem eine Ausführungsform der Erfindung erkennbar ist. In the drawing, an optical compensation is shown, from which an embodiment of the invention can be recognized.
Das über das Bildfenster 1 geführte Bildband 2 wird von der gezahnten Transporttrommel 3 in üblicher Weise fortbewegt. Zwischen Bildfenster und Transporttrommel befindet sich eine ungezahnte Walze/]., an deren Umfang das Bildband anliegt. Die Walze ist unabhängig vom Antriebswerk frei drehbar. Gegendruckrollen 5 sorgen dafür, daß einerseits beim Stillstand das Bildband nicht von der Walze abgehoben wird und andererseits die Walze 4 durch das sich ' bewegende Bildband in sicherer Weise mitgedreht wird. Zweckmäßigerweise wird bei dieser Ausführung der Durchmesser der Walze so groß gemacht, daß die Winkelgeschwindigkeit der Walze und des Spiegels gleich ist, so daß die Steuerung des Spiegels zum Ausgleich der Bildbandbewegung unmittelbar von der Achse der Walze auf die Spiegelachse übertragen werden kann. Die Rückbewegung des Spiegels erfolgt in bekannter Weise durch einen Nocken- bzw. Kurbeltrieb, der mit der gezahnten Transporttrommel oder einem anderen Teil des Antriebswerkes in Verbindung steht.The illustrated book guided over the image window 1 2 is moved by the toothed transport drum 3 in the usual way. There is an toothless roller /]., On between the image window and the transport drum the scope of which is attached to the illustrated book. The roller is independent of the drive mechanism freely rotatable. Counterpressure rollers 5 ensure that, on the one hand, the picture book is at a standstill is not lifted off the roller and on the other hand the roller 4 through the ' moving picture tape is rotated in a safe manner. Appropriately at this design made the diameter of the roller so large that the angular velocity the roller and the mirror is the same, so that the control of the mirror can be transferred directly from the axis of the roller to the mirror axis to compensate for the movement of the picture tape. the The mirror is moved back in a known manner by means of a cam or Crank mechanism that is connected to the toothed transport drum or another part of the drive mechanism.
Der unabhängig von der Perforation des Bildbandes gesteuerte Antrieb des Ausgleichsspiegels gewährleistet eine genaue Übereinstimmung der Spiegelbewegung mit der Bildbandbewegung und dadurch fehlerfreie Wie- 6§ dergabe des Films.The drive of the compensating mirror, which is controlled independently of the perforation of the illustrated book, ensures an exact match the mirror movement with the picture tape movement and thus error-free weighing 6§ rendering of the film.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEI39808D DE523407C (en) | Cinema projector with optical compensation |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEI39808D DE523407C (en) | Cinema projector with optical compensation |
Publications (1)
Publication Number | Publication Date |
---|---|
DE523407C true DE523407C (en) | 1931-11-24 |
Family
ID=7190154
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEI39808D Expired DE523407C (en) | Cinema projector with optical compensation |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE523407C (en) |
-
0
- DE DEI39808D patent/DE523407C/en not_active Expired
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