SU1661712A1 - Motion-picture camera with continuous film movement - Google Patents

Abstract

The invention relates to film technology and allows an increase in the resolution of a movie camera with optical compensation of continuous motion of a film. In the filming chamber, the mirror 6 of the wrapping system is rotatably mounted about an axis parallel to the axis of rotation of the prism compensator 3 by means of an actuator 16, 17 connected through an amplifier 15 to a photo-receiver 14 mounted in the opening of the field diaphragm 2 and optically coupled through the wrapping system perforations 11 of the film 10 placed in the film channel 9, behind which the illuminator 12, 13 is installed. When the compensator 3 is rotated, the image of the object formed by the objective 1 is displaced through to mpensator relaying system 3 and 4, 5, 6, 7, 8 in the plane of the film channel 9, to the speed equal to the speed of movement of the film 10, but not constant. The shift of the image is corrected by illuminating the perforations 11 of the illuminators 12, 13 and in the course of the rays, reversed during the formation of the image, by applying a signal from the photodetector 14 proportional to the displacement of the image of the perforation 11 to the actuator 16, 17 of the mirror 6. 1 z. . f-ly, 1 ill.

Description

The invention relates to film engineering, specifically to film cameras with optical compensation for the continuous motion of a film.

The purpose of the invention is to increase the spreading ability of the camera by correcting image shift relative to film.

The drawing shows a diagram of the camera

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The filming camera contains a shooting lens 1 successively along the optical axis, a shooting diaphragm 2, a rotating compensating compensator in the form of a transparent hexagon 3, a mirror 4 at an angle of 45 ° to the optical axis, the first lens of the 5 wrapping system, the mirror 6 coinciding with the back focus lens 5, deflecting the optical axis by 60 ° and installed with the possibility of rotation relative to this position at a small angle, the second ch-lens 7 of the wrapping system, whose front focus coincides with With the focus of lens 5 and mirror 6, mirror D deflecting the optical axis by 90 °, ensuring the axis passes through the prism compensator 3 a second time, film channel 9 with frame window a, film 10 with perforations 11, lighting device including a condenser 12 and the source 13 of the light, the coordinate receiver 14, located in the plane of the field diaphragm 2 and optically coupled through the wrapping system with the personnel window a, where the zone of perforations 11 is located, the differential amplifier 15 and the drive along Orochi mirror 6j formed, for example, in the form of two piezoelectric elements 16 and 17 blocks.

Movie camera works as follows.

The shooting lens 1 builds an image of the object to be shot in the plane of the field diaphragm 2 and the front focal plane of the first objective 5 of the reversing system aligned with it. Next, the rays that build the image of the object being shot, pass through the prism-compensator 3, are reflected from the mirror 4 and fall: In the first lens 5 of the wrapping System. The 5 output from the lens are parallel for each image point.

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The object beam enters the turning mirror 6 and, having reflected from it, get into the second lens 7 of the reversing system. The past lens 7 is reflected by the mirror 8 and, the passage a second time, the prism-compensator 3, builds an image of the object to be shot on film 10, located in the film channel 9, combined with the rear focal plane of the lens 7.

To provide a telecentric beam path, the back focus of the first lens 5 of the wrapping system is aligned with the front focus of its second lens 7. When the prism-compensator 3 rotates uniformly, the image of the object to be removed is displaced at an average speed equal to the motion speed of the film 10, but not constant, as a result what happens is the image shift relative to the film. To correct this shift, the perforations 11 are illuminated with the help of a source 13 of light and a condenser 12 and, in the course of the rays considered opposite, are projected into the plane of the field diaphragm 2, where a coordinate photodetector 14 is installed at the location of one of the holes. The latter produces a signal proportional to the displacement of the image of this aperture relative to the aperture of the field diaphragm 2, or, conversely, a signal proportional to the displacement of the image of the object being photographed relative to the film 10. Amplified diff A power amplifier 15 sends a signal to the drive, which reverses mirror 6 until the error signal is removed, i.e. before the image is shifted relative to the film 10, the most fast is the drive, made in the form of two blocks of piezoelectric elements 16 and 17, one of which is lengthened, and the other due to antiphase inclusion, is compressed, rotates the mirror 6, however this is not the only possible option . You can use the drive, made in the form of a galvanometer frame.

Claims (2)

1. A high-speed film camera with continuous motion of a film containing a shooting lens arranged in series along the optical axis, the entrance pupil of which is located in its front focus, a field diaphragm, a prismatic compensator in the form of a transparent polyhedron, mounted to rotate around the axis of rotation passing through it the center is parallel to the side face, a wrapping system of two lenses and three flat mirrors, while placed on the optical axis behind the prism compensator p The first mirror and the first lens of the inverting system are located symmetrically to the third mirror and the second lens, respectively, relative to the normal to the second mirror, passing through the center of the transparent polyhedron and the alignment point of the back focus of the first lens of the inverting system, coinciding with the reflecting surface second mirror, characterized in that, in order to improve Q 5 five 0 resolution of the camera relative to the film, the second mirror of the inverting system is installed to rotate around an axis parallel to the axis of rotation of the transparent polyhedron and is connected to an inserted drive associated with an inserted differential amplifier whose inputs are connected to an input coordinate photoreceiver located in field diaphragm plane and optically conjugated through a wrap system with a frame window of the film channel, beyond which The inserted illumination device is located at the same axis. 2. The filming camera according to claim 1, characterized in that the drive is made in the form of two blocks of piezoelectric elements connected in phase with the output of the differential amplifier.