SU809030A1

SU809030A1 - Device for monitoring film axial instability in motoion picture cameras

Info

Publication number: SU809030A1
Application number: SU792750349A
Authority: SU
Inventors: Олег Николаевич Раев; Лев Иванович Офицеров; Владимир Васильевич Лысенко
Original assignee: Предприятие П/Я В-8589
Priority date: 1979-03-16
Filing date: 1979-03-16
Publication date: 1981-02-28

Description

Изобретение относится к кинотехнике, а более конкретно к устройствам для контроля продольной неустойчивости кинопленки в киноаппарате.The invention relates to film technology, and more particularly to devices for controlling the longitudinal instability of a film in a movie camera.

Известны устройства для контроля ' продольной неустойчивости кинопленки, в которых по поверхности пленки в плоскости кадрового окна скользит щуп электромеханического преобразователя [1] . ίKnown devices for monitoring 'longitudinal instability of a film, in which the probe of an electromechanical converter slides on the surface of the film in the plane of the frame window [1]. ί

Недостатками этих устройств являются погрешность, вносимая в измерения скользящим контактом щупа с пленкой, и невозможность применения в киносъемочных аппаратах, обусловленная 1 наличием обтюратора со стороны эмульсии пленки в зоне кадрового окна.The disadvantages of these devices are the error introduced into the measurements by the sliding contact of the probe with the film, and the inability to use in movie cameras, due to the presence of a shutter from the side of the film emulsion in the area of the frame window.

Наиболее близким по технической сущности является устройство для контроля продольной неустойчивости кино-2 пленки, содержащее осветительную систему со щелью и измерительное устройство (микроскоп), снабженное окулярной микрометрической сеткой, при этом оптические оси осветительной 2. системы и измерительного устройства расположёны под углом к плоскости кинопленки в кадровом окне [2] .The closest in technical essence is a device for controlling the longitudinal instability of a film-2 film containing a lighting system with a slit and a measuring device (microscope) equipped with an ocular micrometric grid, while the optical axis of the lighting 2. system and measuring device are located at an angle to the plane of the film in the frame window [2].

Недостатками этого устройства являются низкая точность измерений, обус-3( ловленная керезкостью изображения щели (светового штриха) в измерительном микроскопе, что вносит субъективность в рценку продольной неустойчивости, и невозможность покадрового контроля продольной неустойчивости кинопленки.The disadvantages of this device are the low accuracy of measurements, caused by 3 (caught by the sharpness of the image of the slit (light line) in the measuring microscope, which introduces subjectivity in the evaluation of longitudinal instability, and the inability to frame-by-frame control of the longitudinal instability of the film.

Цель изобретения - повышение точности измерений и осуществление по- . •кадрового контроля.The purpose of the invention is improving the accuracy of measurements and the implementation of. • personnel control.

Указанная цель достигается тем, что в устройстве для контроля продольной неустойчивости кинопленки, в киноаппарате, содержащем осветительную систему со щелью и измерительный блок с блоком регистрации, причем оптические оси измерительного блока и осветительной системы расположены под углом к плоскости кинопленки, измерительный блок выполнен в виде двух расположенных в плоскости изображения щели фотоэлементов, подключенных соответственно к входам двух усилителей, выходы которых соединены с входом алгебраического сумматора, связанного с блоком регистрации; изображение щели расположено между центрами светочувствительных площадок фотоэлементов; в качестве блока регистрации использован самописец.This goal is achieved by the fact that in the device for controlling the longitudinal instability of the film, in the movie camera containing a lighting system with a slit and a measuring unit with a recording unit, the optical axes of the measuring unit and the lighting system are located at an angle to the plane of the film, the measuring unit is made in the form of two located in the image plane of the slit of the photocells, respectively connected to the inputs of two amplifiers, the outputs of which are connected to the input of the algebraic adder connected about with the registration unit; the image of the slit is located between the centers of the photosensitive areas of the photocells; A recorder was used as a registration unit.

На Фиг. 1 представлена оптическая схема устройства; на Фиг. 2 - расположение изображения щели между свето· чувствительными площадками Фотоэлементов.In FIG. 1 is an optical diagram of a device; in FIG. 2 - the location of the image of the gap between the light sensitive areas of the photocells.

Устройство состоит из осветительной системы, содержащей источник 1 света и конденсор 2, узкой щели 3, объективов 4 и 5, зеркал 6 и 7, Φοτο-ιθ элементов 8 и 9, усилителей 10 и 11, алгебраического сумматора 12 и блока 13 регистрации.The device consists of a lighting system containing a light source 1 and a condenser 2, a narrow slit 3, lenses 4 and 5, mirrors 6 and 7, Φοτο-ιθ elements 8 and 9, amplifiers 10 and 11, an algebraic adder 12 and a recording unit 13.

Узкая щель 3, освещаемая источником 1 света с помощью конденсора 2, проецируется объективом 4 и зеркалом '5 6 на поверхность кинопленки 14 в центр кадрового окна Фильмового канала (не показано). Отраженный от поверхности кинопленки 14 световой пучок'попадает на зеркало 7. Объектив 5 формирует 20 изображение щели 15 в плоскости фотоэлементов 8 и 9, которые установлены перпендикулярно оптической оси объектива 5 таким образом, что изображение щели 15 расположено между центрами 25 светочувствительных площадок 16 и .17 фотоэлементов 8 и 9 (в качестве которых может быть использован, например, двухплощадочный фотодиод). Сигналы с фотоэлементов .8 и 9 после усилите- jq лей 10 и 11 через прямой выход одного и инверсный выход другого поступают на алгебраический сумматор 12 и затем на блок 13 регистрации, в качестве которого может быть использован быстродействующий самописец.A narrow slit 3, illuminated by a light source 1 by means of a condenser 2, is projected by a lens 4 and a mirror '5 6 onto the surface of film 14 to the center of the frame window of the Film channel (not shown). The light beam reflected from the surface of the film 14 hits the mirror 7. The lens 5 forms a 20 image of the slit 15 in the plane of the photocells 8 and 9, which are mounted perpendicular to the optical axis of the lens 5 so that the image of the slit 15 is located between the centers 25 of the photosensitive areas 16 and. 17 photocells 8 and 9 (for which, for example, a two-site photodiode can be used). The signals from photocells .8 and 9 after amplification jq lei 10 and 11 through the direct output of one and the inverse output of the other are fed to the algebraic adder 12 and then to the recording unit 13, which can be used as a high-speed recorder.

При изменении положения поверхности кинопленки 14 происходит соответствующее смещение изображения щели 17 в сторону одного или другого Фотоэлемента в зависимости от направле- 40 ния смещения кинопленки 14. При этом блок 13 регистрации фиксирует им-, пульс, амплитуда которого содержит информацию о величине продольного смещения, а Фаза - о направлении сме- 45 щенйя кинопленки 14.When changing the position of the surface of the film film 14, a corresponding shift of the image of the slit 17 towards one or the other photocell occurs, depending on the direction of the bias of the film 14. In this case, the recording unit 13 fixes the pulse, the amplitude of which contains information about the longitudinal displacement, and Phase - about the direction of the shift of the film film 14.

Описанное устройство позволяет повысить точность измерений и осуще ствить покадровый контроль, продольной неустойчивости кинопленки, исключив при этом процессы Фотохимической обработки кинопленки и разборки киноаппарата, что в свою очередь повышает производительность и уменьшает . трудоемкость контроля.The described device makes it possible to increase the accuracy of measurements and carry out frame-by-frame control of the longitudinal instability of the film, eliminating the processes of photochemical processing of the film and disassembling the film camera, which in turn increases productivity and decreases. the complexity of control.

Claims

The invention relates to motion picture technology, and more specifically to devices for controlling the longitudinal instability of a film in a movie camera. Devices are known for controlling the longitudinal instability of a film in which the probe of the electromechanical transform of the body l slides along the surface of the film in the plane of the personnel window. The disadvantages of these devices are the error introduced into the measurements by sliding contact of the probe with the film, and the impossibility of using in film cameras, due to the presence of a shutter on the emulsion side of the film in the area of the cad window. The closest in technical essence is a device for controlling a longitudinal instability of a cinema film containing an illumination system with a slit and a measuring device (microscope) equipped with an ocular micrometric grid, while the optical axes of the illumination system and measuring device are located at an angle to the film plane frame window 2. The disadvantages of this device are low measurement accuracy, due to the sharpness of the slit image (light bar) in the measuring microscope That introduces subjectivity rtsenku longitudinal instability and inability to control the longitudinal flipping film instability. The purpose of the invention is to improve the accuracy of measurements and the implementation of frame-by-frame control. This goal is achieved by the fact that in a device for controlling the longitudinal instability of a film, in a camera containing a lighting system with a slit and a measuring unit with a recording unit, the optical axes of the measuring unit and the lighting system are angled to the film plane, the measuring unit is made in the form of two located in the plane of the image of the slit of photocells connected respectively to the inputs of two amplifiers, the outputs of which are connected to the input of the algebraic adder, nnogo a recording unit; the image of the slit is located between the centers of the photosensitive areas of photocells; A recorder was used as a recording unit. FIG. Figure 1 shows the optical layout of the device; in fig. 2 - location of the image of the slit between the light-sensitive areas of the photocells. The device consists of a lighting system containing a source of light 1 and a condenser 2, a narrow slot 3, lenses 4 and 5, mirrors 6 and 7, photocells 8 and 9, amplifiers 10 and 11, an algebraic adder 12 and a recording unit 13. A narrow slit 3, illuminated by light source 1 using a condenser 2, is projected by lens 4 and mirror 6 onto the surface of film 14 in the center of the frame window of the Film Channel (not shown). The light beam reflected from the film 14 surface hits the mirror 7. Lens 5 forms an image of the slit 15 in the plane of the photo elements B and 9, which are installed perpendicular to the optical axis of the lens 5 so that the image of the slit 15 is located between the centers of the photosensitive pads 16 and 17 photo cells 8 and 9 (for which, for example, a two-site photodiode can be used). The signals from photocells .8 and 9 after amplifiers 10 and 11 through the direct output of one and the inverse output of the other go to an algebraic adder 12 and then to a block 13 of registration, as which can be used a high-speed recorder. When the position of the surface of the film 14 changes, the image of the slit 17 J3 corresponding to the displacement of one or the other Photocell occurs depending on the direction of displacement of the film 14. At the same time, the registration unit 13 captures the pulse, the amplitude of which contains information about the magnitude of the longitudinal displacement, and the phase - on the direction of the displacement of the film 14. The described device allows to increase the measurement accuracy and to implement frame-by-frame control of the longitudinal instability of the film, while excluding photochemical processes film processing and disassembly of the camera, which in turn improves performance and reduces. the complexity of the control. Claim 1. A device for controlling the longitudinal instability of a film in a movie camera, containing an illumination system with a slit and a measuring unit with a recording unit, the optical axes of the measuring unit and the illumination system located at an angle to the film plane, in t-l. a yi ee. By the fact that, in order to increase the accuracy of measurements and perform frame-by-frame monitoring, the measuring unit is made in the form of two photo cells located in the image plane of the slit, connected respectively to the inputs of two amplifiers, the outputs of which are connected to the input of the algebraic adder connected to the recording unit. 2. The device according to claim 1, characterized in that the image of the slit is located between the centers of the photosensitive areas of the photocells. 3. The device according to claim 1, characterized in that a recorder is used as a recording unit. Sources. Information taken into account in the examination 1.Farner I.M. et al. A universal instrument for measuring film pulsations in a personnel window of a film projector, works NIKFI, vol. 49, 1962.

2. Development of a technique and a design of devices for control testing of film-making devices (report) TSSDF, M., 1951,. P. 45-47 (prototype).

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