DE584277C - Device to compensate for differences in length of films during contact copying, especially for sound film copying machines - Google Patents

Device to compensate for differences in length of films during contact copying, especially for sound film copying machines

Info

Publication number
DE584277C
DE584277C DENDAT584277D DE584277DD DE584277C DE 584277 C DE584277 C DE 584277C DE NDAT584277 D DENDAT584277 D DE NDAT584277D DE 584277D D DE584277D D DE 584277DD DE 584277 C DE584277 C DE 584277C
Authority
DE
Germany
Prior art keywords
copying
compensate
differences
length
negative
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
Application number
DENDAT584277D
Other languages
German (de)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Geyer Werke A G
Original Assignee
Geyer Werke A G
Publication date
Application granted granted Critical
Publication of DE584277C publication Critical patent/DE584277C/en
Expired legal-status Critical Current

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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
    • G03B27/00—Photographic printing apparatus
    • G03B27/02—Exposure apparatus for contact printing
    • G03B27/04—Copying apparatus without a relative movement between the original and the light source during exposure, e.g. printing frame or printing box
    • G03B27/08—Copying apparatus without a relative movement between the original and the light source during exposure, e.g. printing frame or printing box for automatic copying of several originals one after the other, e.g. for copying cinematograph film

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)

Description

Beim Kopieren «ines Negativfilms auf einen Positivfilm ist es nötig, um ein scharfes Bild zu erhalten, daß jeder Bildpunkt des Negativs während der Belichtung seine Lage relativ zum Positiv nicht ändert. Bei Kopiermaschinen, die bildweise kopieren, ist Gewähr dafür geleistet, da Negativ und Positiv während der Belichtung stillstehen. Bei kontinuierlich laufenden Kopiermaschinen aber, die notwendig sind, um Tonaufzeichnungen zu kopieren, wird das Negativ und Positiv ständig am Kopierfenster vorbeigezogen. Da das Po-sitivmaterial frisch ist und eine Teilung von 4,75 mm hat, das Negativmaterial aber schon »5 behandelt und getrocknet worden ist und in der Teilung kleiner ist, ist es schwierig, eine vollkommen scharfe Kopie, die auch noch die höchsten Tonfrequenzen aufzeichnet, herzustellen. When copying a negative film on a positive film, it is necessary to have a sharp image to get that each pixel of the negative during the exposure its position relative does not change for the better. This is guaranteed for copier machines that copy image by image done because negative and positive stand still during the exposure. With continuously but running copier machines that are necessary to copy sound recordings, the negative and positive is constantly pulled past the copy window. Since the positive material is fresh and has a pitch of 4.75 mm, but the negative material is »5 has been treated and dried and in As the pitch is smaller, it is difficult to get a perfectly sharp copy that still has the records the highest audio frequencies.

ao Durch die vorliegende Erfindung wird diese Schwierigkeit beseitigt.ao By the present invention this Difficulty eliminated.

Das Wesen der Erfindung besteht darin, daß die Kopierzahntrommel durch Wahl eines bestimmten Durchmessers sowohl der Teilung S5 des auf sie aufgelegten Negativs als auch der Teilung des auf das Negativ aufgelegten Positivs angepaßt ist.The essence of the invention is that the copy toothed drum by choosing one certain diameter of both the pitch S5 of the negative placed on it and the Division of the positive placed on the negative is adapted.

In der Zeichnung ist beispielsweise der Lauf des Negativs iV und des Positivs/3 über die Zahntrommel Z an dem Belichtungsfenster B vorüber dargestellt. In the drawing, for example, the run of the negative iV and the positive / 3 over the toothed drum Z past the exposure window B is shown.

Radius und Teilung dieser Transporttrommel sind nun so bestimmt, daß der längere Positivfilm auch den längeren Weg zu durchlaufen hat und daß trotzdem die Schichten des Negativs mit denjenigen des Positivs auf der Zahntrommel während des Vorbeilaufens am Belichtungsfenster ohne relatives Gleiten ' zueinander in innigem Kontakt bleiben.The radius and division of this transport drum are now determined so that the longer one Positive film also has to go the longer way and that still the layers of the negative with those of the positive on the toothed drum as it passes by remain in intimate contact with one another at the exposure window without relative sliding.

Aus der Zeichnung geht hervor, daß, um dies zu erreichen, die GleichungIt can be seen from the drawing that in order to achieve this, the equation

'Neg ?n ^n 'Neg ? N ^ n

t Pos t item

1Tn + 0,15 1 T n + 0.15

(unter Voraussetzung einer bestimmten Filmdicke) eingehalten werden muß. Es kann also der Radius/·« der ZahntrommelZ aus dieser Gleichung so ermittelt werden, daß Negativ und Positiv trotz verschiedener Teilung ohne relatives Gleiten zueinander im Bereich des Belichtungsfensters über die Zahntrommel laufen. Durch Auswechseln der Trommel mit verschiedenem Durchmesser läßt sich auf diesem Wege jedes Tonnegativ unabhängig von der Teilung mit vollständiger Schärfe kon- 55, tinuierlich kopieren.(assuming a certain film thickness) must be adhered to. So it can the radius / · «of the toothed drumZ from this Equation can be determined so that negative and positive despite different division without relative sliding to one another in the area of the exposure window over the toothed drum to run. By replacing the drum with In this way, each tone negative can be made independent of different diameters the division with complete sharpness 55, copy continuously.

Claims (2)

Patentansprüche:Patent claims: 1. Vorrichtung zum Ausgleich von Langenunterschieden der Filme beim Kontaktkopieren, insbesondere für Tonfilmkopiermaschinen, dadurch gekennzeichnet, daß die Kopierzahntrornmel durch Wahl eines bestimmten Durchmessers sowohl der Teilung des auf sie aufgelegten Negativs als auch der Teilung des auf das Negativ aufgelegten Positivs angepaßt ist.1. Device to compensate for differences in length of films in contact copying, especially for sound film copying machines, characterized in that, that the Kopierzahntrornmel by choosing a certain diameter of both the Division of the negative placed on it as well as the division of the negative on top applied positive is adapted. 2. Vorrichtung nach Anspruch r, dadurch gekennzeichnet, daß zwecks Anpassung an verschiedene Negative die Kopierzahntrommel auswechselbar angeordnet ist.2. Apparatus according to claim r, characterized in that for the purpose of adaptation The copier toothed drum is arranged interchangeably on different negatives. Hierzu 1 Blatt Zeichnungen1 sheet of drawings
DENDAT584277D Device to compensate for differences in length of films during contact copying, especially for sound film copying machines Expired DE584277C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE584277T

Publications (1)

Publication Number Publication Date
DE584277C true DE584277C (en) 1933-09-19

Family

ID=6571656

Family Applications (1)

Application Number Title Priority Date Filing Date
DENDAT584277D Expired DE584277C (en) Device to compensate for differences in length of films during contact copying, especially for sound film copying machines

Country Status (1)

Country Link
DE (1) DE584277C (en)

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