SU135757A1 - High speed movie camera - Google Patents

Description

High-speed filming cameras are known using a rotating geocamera, accelerating the movement of the light beam and rotating the image of an object on the foil along the arc of moving the beam through a system of lens inserts. The disadvantage of such devices is rala speed.

The camera described is different from the known topics. that in it a prism block, a parallel beam of rays emanating from the lens 9 and four parts, forms a system of lens inserts forming two lock rings and four rotating flat mirrors are out of phase and fixed on a common axis.

Such an embodiment of the camera makes it possible to turn it into "waiting." Fig. 1 schematically shows a high-speed imaging camera, and figs 2 and 3 show prism separation blocks.

The lens / and 2 builds the image of the subject in the plane of the diaphragm 3. By the lens 4 through the diaphragm 5 and by means of the separation prism 6, as well as intermediate mirrors 7, 8, 9 and lens 10, as well as the mirror // the image of the removed object is built on the central mirror 12, which is mounted on the "mirror shaft

From the central rotating mirror, the image of the object is projected through the crown lenses 13 onto the film 14 with the image enhanced. At the same time, the lens 10 is used to create an image of the aperture 5 with a certain decrease on the entrance pupil of the lens 13. When the central mirror rotates, the light beam moves successively to the crown of the lens 13, forming a series of consecutive frames on a fixed film. In order to eliminate the interruption in the photographing at the required moment, the fillet is transferred from the first channel and the second one, which will produce as many frames as are required to eliminate the interruption and block the "dead zone." Then the film goes back to the first channel, the photographing continues until the first channel penetrates the "dead zone of the lens of the second channel." In the future, the film

No. 135757 2 switches to the second channel, and photographing continues until the complete loop of the film is closed. After that, the film passes to the third channel, which together with the fourth channel form the second closed loop of the film. The projection of the diaphragm 5 at the entrance pupil of the lens 13 serves as a shutter. The travel time of the light beam over the entrance pupil of lens 3 is the estimated frame exposure time. The described image transmission is the same in all four channels. During one revolution of the mirror shaft, the film is shot on two closed turns of the film, with the beginning of the first turn of the film and the end of the second.

Such an arrangement of the film turns and a constantly rotating shaft with four mirrors allow the survey to start at any time, for which the control pulse synchronizes the start of the process development with the start of opening the electrodynamic shutter placed in the plane of the diaphragm 3.

In the described camera, the speed or frequency of shooting depends on the number of revolutions of the mirror shaft, the diameter of the camera and the size of the schaga between frames. The camera is equipped with two interchangeable prism separation units for dividing the exit pupil in two ways: in the first exit, the pupil of the lens is divided into four rectangles (Fig. 2) into four rectangles, which are shown on the entrance pupils of the coring lenses. In this case, the camera has a high-speed aperture, being a four-pupillary; in the second, the central rectangle is cut out of the exit pupil of the lens by a prism unit (Fig. 3). The division into four channels occurs by the method of percentage aluminizing of the dividing faces of the block, which reduces the aperture ratio of the chamber. When using the second block (Fig. 3), the camera has a single central pupil and can be used to capture processes in conjunction with shadow instruments and interferometers to study phenomena that occur, for example, in wind tunnels. A reference grid can be placed in the plane (intermediate image) of the aperture to be photographed by the camera along with the object to be photographed.

In order to charge the camera with a film in the light, the camera is equipped with a feed 15 and a receiving 16 cassettes. The feed cassette holds a film that provides sixteen shots. The end of the film coming out of the feeding cassette is placed in the rim channel and through the rollers passes from one channel to another, pressing the fixed rim with two closed coils and the entrance to the receiving cassette 16. After shooting the process under study, the film is rewound with the receiving cassette, cut off and transferred to processing in the photo lab. Processed film is projected onto the screen with standard film projectors.

Subject invention

Kryzhanovsky's high-speed movie camera with a lens that transfers an image of an object through reflective surfaces onto rotating mirrors that accelerate the movement of the light beam and expand the image on the film along an arc of beam movement through a system of lens inserts, so that the camera becomes “waiting” It uses a prism block that divides a parallel beam of rays emanating from the lens into four parts, the system of lens inserts forms two closed rings, and four rotating flat Erkaev phase shifted and fastened on a common axis.

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