SU1413585A1 - Device for monitoring and correcting film position in cine camera film channel - Google Patents

Abstract

The invention relates to film technology and permits an increase in the quality of recording and reproducing an image in movie cameras. An image of the vertical borders of the perforation hole 3, characterizing the possible horizontal displacement of the film 1 in the film channel 4 relative to the nominal value, is obtained. The error signal is integrated over several operation cycles of the camera, displayed on the control unit and fed to the actuator 28, which causes the horizontal displacement of the film 1 in the movie channel 4.

Description

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The invention relates to a film technician, namely, control devices for correcting camera parameters, and can be used to monitor and correct the stability of a film in a movie camera channel.

The purpose of the invention is to enhance the recording and reproduction of the image by stabilizing the spatial position of the film.

Fig, 1 shows a block diagram of the device; 2 shows an example of a KOHCTPJTK-active execution of an actuator; on fig.Z - registogram horizontal displacements of the basic elements of film (perforation) in the movie channel of the camera.

The device contains a film J, a light source 2, a controlled perforation segment 3, a film channel 4, a focusing lens 5, a board (plane) 6, on which photoreceivers 7 and 8 are located, a comparison device 9, an amplifier 10, a sampling-storage device 11, synchronization device 12, jumper phase sensor 33, integrator 14, threshold device 5, limiter 16, switch 17 second amplifier 18, actuator 28 consisting of stepper motor J9, coupling 20, shaft 21, roller 22, keys 23, nuts 24 and washers 25, analog-to-digital converter 26 and display unit 27.

The device works as follows.

The film J is charged and the source 2 is light. The luminous flux emitted by the source 2 light illuminates the edges of the controlled perforations 3 films J charged in the film channel 4, Lens 5 builds an enlarged image of the perforations 3 in plane 6 of the location of the photodetectors 7 and 8, The signals from the photodetectors 7 and 8 are fed to the comparison device 9. At the nominal position of the controlled perforation of 3 films 1, fixed by the basic element of the cinematographic mechanism of the camera, the signals from photo receiving devices 7 and 8 are equal. due to the fact that the same area of the illuminated areas. At the nominal position of the controlled perforation 3, the signal at the output of the comparison device 9 is equal to 0. The horizontal displacement of the controlled perforation 3 of the film I causes a corresponding displacement of its image relative to the photodetectors 7 and 8, while the illuminated area; one of the photodetectors increases, the other S decreases, causing proportional changes in the currents at the output of the device 9. comparison. In this case, the signal at the output of the device.9 of the comparison will become different from zero, and the magnitude of the output signal depends on the magnitude of the offset of the perforation 3 of the film J, and the sign of the output signal depends on the direction of the displacement. A signal from the output of the comparison device 9 is supplied to the amplifier JO and from its output is fed to the input of the sample-storage device 11. The operation of the sampling-storage device J is performed by a strobe signal from the output of the synchronization device 12 at predetermined moments of the camera cycle, for which the input of the synchronization device 32 is sent from the sensor J3 of the phase of the camcorder's hopping mechanism. The supply of the building signal for controlling the device J1 of the sample-storage is carried out at the moments when the intermittent transport phase A of the film. 1 is completed, and the basic elements of the hopping mechanism, which fix it in the film channel 4 of the camera during the resting phase B (Fig. 3), still do not affect the film J. The value of the signal, depending on the spatial shift of the film 1 relative to the nominal value at the time of gating B, is memorized with the aid of the sampling-storage device L1 and stored for the entire period of the operation of the hopping mechanism until the next building pulse. The signal from the output of the sampling-storage device JJ is sent to the input of the integrator 14, with which the averaging is performed. signal for a given time interval corresponding to several periods T of film frame change, signal S from the output of integrator J4 is fed to the input of threshold device J5, where its value is compared with the reference value (threshold) The signal from the output of threshold device 15 is fed to input the amplifier limiter 16, which generates a constant level signal in the case of a signal with a signal at the input of the threshold device 15 of the reference value, and the sign of the output voltage is equal to the sign of the signal at the input of the threshold device va 15, the signal from the output of the limiter amplifier 16 is fed to the input of the switch 17, the signal at the output of the switch 17 is equal to the input one in the case of the presence of a correction resolution signal at the second (control) input of the switch 17. The correction resolution signal is generated by the synchronization device 12. The duration and temporal position of the correction resolution signal corresponds to the transport phase of the film by jumping meganism. The signal from the output of the switch 17 is fed to the input of the second amplifier 18, from the output of which is fed to the actuator 28. The actuator 28 can be made in the form of a stepper motor 19, which is turned into a voltage corresponding to the sign and by the value proportional to the value of the control channel and in the vertical direction. the board.

Claims (1)

The correction signals generated by the camera operation from the output of the sampling-storage circuit JJ, portioned to the deviations of the position of the film J from the nominal, are digitized by an analog-to-digital converter 26 for further registration in the display block 27 to correct these deviations at subsequent stages end-to-end kinographic process. As a carrier of the recorded information can also be used magnetic tape or transported in a movie camera film 1. Formula invented A control device for correcting the position of a film in a film camera channel, containing a source, a photo-receiver device optically connected to a light source and electrically connected to an amplifier electrically connected to a control unit and an actuator, characterized in order to improve the recording quality and reproduce from the output of the second usi-gg image to the device 35 IS, and transmitting rotation through sleeve 20 onto shaft 21 together with roller 22 freely mounted on it, which moves along the axis due to the inclined groove and key 23 entering it. When moving roller 22 along the axis, with its shoulder the roller displaces the film 1 in film channel 4 in the horizontal direction. The roller 22 is mounted on shaft 21 with JQ using nut 24 and washer 25 (Fig. 2). The number of steps is determined by the total amount of correction of the position of the film 1. The shift direction of the film 1 is achieved by changing the current direction in the winding of the stepper motor 9i, for a period T frame changes in the movie channel 4 of the camcorder, the adjustment mechanism 28 is processed by the adjustment step, and the time of the correction of the current impulse corresponds to the time of the presence of the pulse from the synchronization device J2. Similarly, an adjustment may be made; stability of the film in the second photoreceiver is entered, the comparison device, the inputs connected to the photoreceivers, and the output to the amplifier, the sampling-storage device, the first to the house connected to the output of the amplifier and the first output to the sequence connected by the integrator, the thresholds by the device, amplifier-limit The lem, the switch and the second amplifier whose output is connected to the executor by the mechanism, the sensor of the phase of the jump mechanism, the output of which is connected to the input of the synchronization device, the first output of which is connected to the second input the storage selection device, the switch and the cone unit, while the control unit is output as a series-connected analog-digital converter and a digital indicator, and the first input of the analog-digital converter is connected to the second output of the sample-storage device, Photoelectric photoglasses are mounted opposite the image of the vertical boundaries of the perforation hole, 50 image capture in device a second photoreceiver, a comparison device, inputs connected to photoreceivers, and an output amplifier, a sampling-storage device, a first input connected to the amplifier output, and a first output serially connected by an integrator, a threshold device, a limiting amplifier, a switch, and the second amplifier, the output of which is connected to the executive mechanism, the phase sensor of the jump mechanism, the output of which is connected to the input of the synchronization device, the first output of which is connected It is connected to the second inputs of the sample-storage device, the switch and the control unit; the control unit is made in the form of serially connected analog-digital converter and digital indicator, and the first input of the analog-digital converter is connected to the second output of the sample-storage device Photoelectric sensors are installed opposite the image of the vertical borders of the perforation hole, G9 20 21 mm 0.2 0.1 CHCHCHCHCHCHCHC xs 23 22 25 2 FIG. 2 1112 Fi.Z