SU824110A1 - Method and device for fast frame-by-frame filming - Google Patents

Description

The invention relates to motion pictures, in particular, to high-speed film shooting. Methods of accelerated film shooting and devices for their implementation are known, comprising an optical input unit, a switching device and a film moving mechanism l. . The disadvantage of these methods and devices is the difficulty of obtaining high-speed, high-quality shooting, since the shooting is carried out on a fixed photosensitive material. The closest in technical essence to the present invention is a method of accelerated cropped filming based on fixing successive phases of the object to be shot onto an intermittently moving film, and a device for its implementation containing an input optical unit and a mechanism of intermittent motion of film 2. The disadvantage of the known method and device is The fact that the shooting frequency cannot exceed 250300 fps. The purpose of the invention is to increase the frequency of filming. This goal is achieved by the fact that in the method of accelerated cropping, based on fixing the successive phases of the object to be shot onto an intermittently moving film, sequential cyclic switching and continuous fixation of the images of consecutive phases of the object being shot: on a number of films intermittently moving with a phase shift, consistently relative to each other, by an amount equal to, where n is the number of films. 3 An apparatus for carrying out an accelerated cropping film method, comprising an input from: a static unit and a mechanism for intermittent motion of a film, is provided with additional mechanisms for intermittent motion of films, kinemati, connected with each other and the main mechanism for intermittent film displacement with phase shift on commuting. made in the form of kinematically connected with each other. central and channel disk mirror covers and a system of movably fitted reflecting mirrors; the central obturator is made with an opening angle, and the fixed reflecting mirror corresponding to it is located in a plane perpendicular to the central obturator plane along the optical axis; channel obturators are made two-blade with an angle open 90 and are shifted relative to each other in phase 90 °, and the corresponding fixed reflecting mirrors are located in a plane parallel to the plane and channel shutters along the optical axes in FIG. 1 A schematic diagram of the device for implementing the method of accelerated cropped filming is shown; in fig. 2 is a view. And FIG. 1. The device contains an input optical unit 1, behind which there is a switching device consisting of a central obturator 2, the First channel obturator 3 and a fixed mirror 4, a stationary central mirror 5, a second channel obturator 6 and a fixed mirror 7 and mechanism 8-11 for intermittent film movement (not shown). Here, the mechanisms of the 8th intermittent film movement are kinematically connected between the central 2 and the channel 3 and 6 shutters with gear ratios, for example, 1: 1. The central obturator 2 is single-bladed with an opening angle of .180, and the channel obturators Zb are double-bladed with an opening angle of 90 ° and rotated relative to each other by 9O (Fig. 2), with the phases of the central 2 and channel 3 obturator coinciding. 104. The device works as follows. The input optical unit 1 forms an optical image of successive phases of change of the subject, which is distributed by the switching device through the channels, to the photosensitive film material. The input optical unit builds an image of the subject (not shown) in the frame windows of the film channels (not shown) of the intermittent movement mechanisms 8-11. During shooting, the shutters 2, 3 and 6 rotate at a constant speed. Due to their in-phase operation, the luminous flux is first divided into two parts by a central obturator 2, then each part in turn is divided by channel obturators 3 and 6 again into two. When the luminous flux intersects the blade of the central obturator 2, it reflects the first channel obturator 3, one blade of which half a period reflects the luminous flux in the film channel of the intermittent movement mechanism 9, the second half of the period passes the static obturator to the fixed inclined mirror 4 which directs the light the flow into the film channel of intermittent movement 8. When the central obturator is rotated 2 by 180, the light beam falls on a fixed, inclined mirror 5, which directs the light beam at volts swarm obturator channel 6. The channel 6 obturator divide the incident beam into two channels directly svo-. it has a blade and a fixed inclined mirror 7 on the mechanisms 11 and 10 of the extreme gear. Since the phases of operation of the clamshell mechanisms 8-1 i (not shown) of the intermittent movement of films are shifted by 90, the appearance of the image in each film channel will occur at the moment when the film is stationary. Thus, while providing intermittent movement, the films of the c. At a frequency of 250 fps, the total shooting frequency of the object under study is 4x250 1000 fps. In this case, this method is carried out. continuous recording in time of all fixed movements. The proposed method of cropping shooting allows you to capture fast-moving processes on interrupted moving film at high speed and with high technical parameters characteristic of motion-picture cameras with intermittent film movement, with the achievement of physical non-exclusion. fixation in time of the object being shot.

The proposed device differs from the already known similar cameras by splitting out the commutating device and the kinematic connection of the mechanisms of intermittent film transport, these features of the device allow to obtain high shooting speeds, with a relatively simple design and low speeds of rotation, with intermittent movement of the film.

To project an image of the resulting film onto the screen, it is imperative to use a projector that is made according to the concept of a movie camera with independent illuminators.

Formula: Inventions

1, A method of accelerated cropped filming based on fixation of successive phases of the subject on the intermittently movable film, characterized in that, in order the Enhance frequency filming, osU1tsestvl dissolved consistent cyclic switching and continuous image capturing successive phases of the subject into a number of films, prershistoe movement which are carried out with a phase shift, sequentially relative to each other, by a value equal to 360 n, where n is the number of films.

2. A device for carrying out

The method of accelerated cropping film according to claim 1, comprising an input optical unit and a mechanism for intermittent motion of a film, characterized in that

it is equipped with additional mechanisms of intermittent movement of films, kinematically connected with each other and with the basic 1m mechanism of intermittent movement of film films | Ki with a phase shift of 90, and with a kommutiruyuschim unit, made in the form of kinematically connected — between a central and channel disk mirror mirrors. and non-binding systems (but installed reflecting mirrors, with the central obturator made with an opening angle of 180®, and the corresponding fixed reflecting mirror

located in a plane perpendicular to the plane of the central obturator along the optical axis, the channel obturators are two-bladed with an opening angle of 9O and offset from each other in phase 90, and the corresponding (and it has non-moving reflecting mirrors located in a plane parallel to the plane of the channel obturators along the optical axis .

Sources of information taken into account in the examination

1. USSR author's certificate number 463090, cl. e 03 B. 39/02, 1973.

2. Sakharov A.A. High-speed filming, Roskinoizdat, M., 1950, p. 39-45 (prototype).

Claims (2)

The claims of the invention 1. The method of accelerated framed filming, based on the fixation of successive phases of a filmed object on an intermittently movable film, characterized in that, in order to increase the frequency of filming, sequential cyclic switching and continuous fixation of the image of successive phases of the filmed object on a series of films, intermittent movement of which carried out with a phase shift, after 10. 6 clearly relative to each other, by an amount equal to 360 ° ή, where η is the number of films. 2. A device for implementing the method of accelerated cropped filming in π. 1, comprising an input optical unit and a mechanism for discontinuous movement of a film, characterized in that it is equipped with additional mechanisms for discontinuous movement of a film kinematically coupled to each other and with the main mechanism of discontinuous movement of a film with a phase shift of 90, and a cocommuting block made in the form of kinematically connected -. · between themselves of the central and channel disk mirror obturators and the system of stationary installations of reflecting mirrors, while the central obturator disclosure is made with an angle 180®, and the corresponding fixed reflecting mirror is arranged in a plane perpendicular to the central plane of the obturator along the optical axis, channel bladed obturators are made with an opening 90 ^e and offset from each other in phase 90®, and the corresponding fixed reflecting mirrors located in a plane parallel to the plane of the channel obturators along the optical axis.