DE114920C

DE114920C -

Info

Publication number: DE114920C
Application number: DENDAT114920D
Authority: DE

Description

KAISERLICHESIMPERIAL

PATENTAMTPATENT OFFICE

Die meisten der bisher gebräuchlichen Einrichtungen zum Photographiren sich bewegender Objecte bzw. Projiciren derartiger Photographien arbeiteten intermittirend. Entweder wurde der Film selbst ruckweise fortbewegt oder aber der Film wurde mit gleichförmiger Geschwindigkeit fortgezogen und durch eine optische Compensationsvorrichtung wurde dafür gesorgt, dafs das auf dem Film bzw. dem Projectionsschirm entworfene Bild sich nicht gleichfalls bewegte, sondern dauernd auf demselben Punkte verharrte.Most of the devices in use hitherto for photographing are moving Objects or projections of such photographs worked intermittently. Either was the film itself jerked or the film became more uniform Speed was pulled away and an optical compensation device was used to ensure that this was on the film or on the The image designed on the projection screen did not move in the same way, but was constantly on the same Points persisted.

Dieser optische Ausgleich wurde meistens dadurch erreicht (s. die amerikanischen Patentschriften 588916 und 614366), dafs das Bild von einem oscillirenden Spiegel reflectirt wurde, so dafs trotz der Bewegung des Films das Bild annähernd immer auf derselben Stelle verharrte. This optical compensation was mostly achieved in this way (see American patents 588916 and 614366), that the image was reflected by an oscillating mirror, so that, in spite of the movement of the film, the picture remained almost always in the same place.

Die schnelle hin- und herschwingende'Bewegung des Spiegels verursachte nun mechanische Schwierigkeiten, auch War der optische Ausgleich nur unvollkommen, weil die Bewe-. gung des Spiegels nicht gleichmiifsig sein konnte, und weil aufserdem bei der Rückwärtsbewegung des Spiegels die Reflexion vollkommen unterbrochen war. ·The rapid to and fro movement of the mirror now caused mechanical difficulties, including the optical one Compensation only imperfectly because the moving. of the mirror cannot be uniform and because, in addition, when the mirror is moved backwards, the reflection is perfect was interrupted. ·

Eine ähnliche Ausgleichsvorrichtung wie die soeben geschilderte fand auch bei den sogen.. Praxinoskopen (s. die englische Patentschrift 4244/1877) Verwendung. Bei diesen Apparaten, welche zum Reconstruiren der Bewegung eines Körpers aus einer Reihe von Bildern des bewegten Körpers dienen, wurde eine gröfsere Anzahl '.. ebener Spiegel in einem regulären Polygon, welches um seinen Mittelpunkt drehbar war, angeordnet, während die Bilder auf einen ähnlichen Polygon, welches vom Centrum, doppelt so weit wie die Spiegel entfernt war_s sich befanden. Auch bei dieser Ausgleichsvorrichtung blieben nur die Mitten der Bilder unbewegt, während die seitlichen Theile sich für das Auge des Beobachters verschoben. Es wurde deswegen annähernd dieselbe Wirkung erzielt, wie bei den oscillirenden Spiegeln. Im Gegensatz zu den geschilderten Vorrichtungen wird nun bei der vorliegenden Erfindung, welche sich auf eine optische Ausgleichsvorrichtung beim Photographiren auf einen stetig vorwärtsbewegten Film oder beim Projiciren der Bilder von einem solchen bezieht, ein continuirlich sich drehender, ringförmiger Spiegel benutzt, der den optischen Ausgleich durch die eigenartige Gestaltung seiner spiegelnden Fläche bewirkt. 'A compensating device similar to the one just described was also used in the so-called praxinoscopes (see English patent specification 4244/1877). In these apparatuses, which serve a body of a series of images of the moving body to reconstruct the movement was a gröfsere number '.. plane mirror in a regular polygon which was rotated about its center, arranged, while the images to a similar polygon which _s was removed from the center, twice as much as the mirrors were located. With this compensating device, too, only the centers of the images remained motionless, while the lateral parts were displaced to the eye of the observer. For this reason, almost the same effect was achieved as with the oscillating mirrors. In contrast to the devices described, a continuously rotating, ring-shaped mirror is used in the present invention, which relates to an optical compensation device when photographing a continuously moving film or when projecting the images from such a film causes the peculiar design of its reflective surface. '

Da bei dieser Vorrichtung keinerlei oscillirende Bewegung vorkommt, so nehmen auch die xeflectirten Bilder dauernd dieselbe Stelle'ein und werden nicht hin- und hergerückt.Since with this device there is no oscillating movement, the xeflected ones also take Images are always in the same place and are not shifted back and forth.

Auf der beiliegenden Zeichnung stellt Fig. 1 einen Längsschnitt und Fig. 2 einen Querschnitt eines Apparates zum Photographiren mit bewegtem Film bzw. zum Projiciren von bewegtem Film dar. Es sei zur Vereinfachung der Erklärung zuerst die Anwendung des Apparates zur Aufnahme von Photographien auf einen sich bewegenden Film beschrieben.In the accompanying drawing, FIG. 1 shows a longitudinal section and FIG. 2 shows a cross section an apparatus for photographing with moving film or for projecting moving film Film. To simplify the explanation, let us first consider the use of the apparatus for taking photographs written on a moving film.

Eine Welle α, welche durch eine beliebige Vorrichtung in schnelle Umdrehung (beispielsweise 10 bis 20 Umdrehungen in der Secunde) versetzt wird, trägt einen ringförmigen Spiegel b, dessen reflectirende Fläche aus der Ebene A shaft α, which is set in rapid rotation (for example 10 to 20 revolutions per second) by any device, carries an annular mirror b, the reflecting surface of which is out of the plane

Claims

and has an approximately helical shape, that is, the surface goes steadily and evenly down from the highest point of the circumference c to the lowest point at the same point of the circumference reflecting surface at c, depends on the. Length of the image on the film and must be chosen accordingly.

A gripping wheel d provided with projections is driven from the shaft α by means of a screw or some other suitable drive, which , as it rotates, unrolls the film f from a roll e over suitably arranged guide rolls, so that it moves continuously past the opening g .

In the upper wall of the darkroom there is an opening which is closed by a lid h when the apparatus is used to take photographs. In this case the rays of light, of which only the central ray k is drawn in the figure, may come from an object on the outside and be thrown onto the mirror through suitable objective lenses. They are then reflected, and indeed, as shown in the figure, first from a higher point i of the mirror in line j, so that they fall on the right side of opening g. Then, with the advancing movement of the mirror, the ray k is thrown back from ever deeper points of the reflecting surface, so that the reflected ray gradually moves uniformly and steadily until it falls into the line indicated and thus the left edge the opening g grazes. The film has moved along with the beam, so that the beam continuously hits the same spot on the film. So while the. When the film moves past the opening g , every point of the same always receives a ray from the same point on the object. The film exposed in this way, the images of which are all closely connected to one another, is developed and fixed in the usual way.

In order to project the images outwards from a film provided with images on these catfish, it is only necessary to remove the cover h and to send a bundle of parallel rays of light from any source through the opening.

Then each point of the illuminated film first emits a ray in line j of the figure and this ray finally comes into line / as the film moves forward; because while balancing the reflectirende mirror surface is lowered more and more, so the beam from any point of the film is' constantly thrown ο on the center of the lenses, which are of course set in this case for the projection.

In spite of the uninterrupted movement of the film, it becomes the image of something The point of the photograph on the film has a fixed position on the screen maintained. .

Pa ten τ-An Proverbs:

A series apparatus with constantly moving picture tape and optical compensation of the image wandering through a mirror of ring-like shape inserted into the beam path, which rotates around the ring axis and is bent out of the "ring plane" in such a way that when it rotates, a steady wandering of the radiation emanating from a fixed radiation source is reflected Bundle of rays arises.
.Series apparatus of the under i. protected type in which the surface of the mirror forms a ring-like section of a helical surface. -. ·. . ··.

, "■; For this purpose ι sheet of drawings.