SU1509810A1 - Arrangement for automatic control of air photography apparatus exposure time - Google Patents

Abstract

This invention relates to a photo kinetic and can be used to control exposure in aerial cameras. The purpose of the invention is to improve the quality of exposure control in any conditions of the aerial camera. The goal is achieved in that the device additionally contains an amplitude analyzer, a probability density calculator, a differentiating device, a max position detector, a delay line, a sawtooth voltage generator, a pulse amplitude modulator, a pulse counter, a decoder, keys, a mode switch, a device sample storage, exposure level adjuster, comparison circuit and actuator for controlling the light flux of the camera. The introduction of additional elements makes it possible to increase the amount of information on aerial photographs in any conditions of the aerial camera. 3 il.

Description

The invention relates to a photo-cinema technique, in particular, to controlling exposure in aerial photographic cameras when shooting from high and low altitudes, both under cloudless conditions and when images of clouds get in the field of view of an aerial photographic device.

The aim of the invention is to improve the accuracy of exposure control.

Figure 1 shows the overall functional diagram of the device; figure 2 - timing charts of his work; on fig.Z - one of the options for the implementation of the amplitude analyzer.

The proposed device (Fig. 1) contains a light-receiving device.

consisting of a lens 1, a scanning unit 2 and a photoelectric luminance sensor 3, a differentiating device 4, an amplitude analyzer 5, a calculus of probability density calculator 6, a peak position detector 7, a delay line 8, a sawtooth 9 generator, an amplitude-impulse module a torus 10, a pulse counter 11, a decoder 12, an operation mode switch 13, keys 14, a sampling-storage device 15, a comparison circuit 16, an exposure level adjuster 17, an actuator 18 for controlling the light flux of an aerial camera.

A photo sensor of 3 brightness connected to the scanning unit 2 is installed in the focal plane SP

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Date: 31/07/2000

Number of pages: 4

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union of soviet

Sotsia. The natural

REPUBLIC

(nineteen)

1509811 A

(5D 4 G 03 B 21 / .32

STATE COMMITTEE ON INVENTIONS AND OPENINGS AT GCCT USSR

DESCRIPTION OF THE INVENTION

TO AUTHOR'S CERTIFICATE

one

(21) 4303164 / 24-10

(22) 09/02/87

(46) 23.09.89. Bul No. 35

(71) All-Union Research and Development Film and Photo Institute

(72) I.M.Aizman, A.M. Zotov, R.G.Kuliev and B.E.Spektor

(53) 353.881 (088.8)

(56) U.S. Patent No. 2135357, Cl. 88-18.7, 1938.

(54) FAST ACCESSORIES

(57) The invention relates to kinotekhnika and allows for the KI projection of films in rolled rolls (300 and 600 m each), wound if there are 3 slots / subframes.

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on standard cores (56.75 and 100 mm) with an initial lead inward without rewinding. The purpose of the invention is to increase reliability when working with small capacity rolls by introducing into the main kinematic connection between the shafts of the winding and unwinding rolls of a conical variator. An intermediate link of the variator is controlled by an autonomous electric motor of the executive electromechanical device according to a signal produced by the sensors for the speed of rotation of the shaft of the coil to be wound. To eliminate slips - 8 paths of film projects / pore,

12

23

1 22

31

When the device starts and accelerates, the electromagnetic drive 21 closes the coupling 20 and drives an additional rigid kinematic connection of the shaft of the unwinding roll 12 through the gears 18 and 19 with the shaft of the roll up roll 6. After the need for the time of acceleration of the roll 12 of the Invention relates to film technology primarily for use in cinemas used in film projection for rolling rolls wound on standard cores.

The aim of the invention is to increase the reliability and stability of the device with rolls wound on standard cores.

FIG. Figure 1 shows the kinematic scheme of the unwinding device in Figure 2 — the structure of the electrical connections.

The device consists of an electromotor 1 winder, a gear 2-5 gear reducer coiler, a coiled roll 6 mounted on the same shaft with the drive cylinder 7 of the variator. In addition, the variator link 8 of the variator is located in the kinematic friction coupling with the driving cylinder 7 and the driven cone 9. On the shaft of the cone 9 there is a gear wheel 10, which engages with the wheel 11 of the shaft of the unwinding roll 12. The cone 9 of the variator with its own The scrap and gear wheel 10 are installed in frame 13, which can be rotated around the axis of gear wheel 11. A spring 14 is used for force closure of the variator. Intermediate link 8 is installed on the lead screw 15 connected to an autonomous electric drive 16. The link 8 with the lead screw 15 is housed in the swing frame 17. An additional kinematic connection of the shaft of the namati; your roll 6, which carries the drive cylinder 7 of the variator with the shaft, the expandable roll 12, consists of gear wheels 18 and 19 and the gear clutch 20. Leading the coupling element is movable and coupled with an electromagnetic actuator 21. At the second end of the shaft of the electric motor 1,

,

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The electromagnetic actuator 21 is turned on and the clutch 20 is opened. The fixed positions of the intermediate link 8 of the variator are encoded on the code plate 24, moving together with link 8, the Code plate 24 interacts with the optical sensor 25 of the gear ratio of the variator; to 2 il.

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The sprocket 22 has an inductive coupling with two sensors 23 of the speed of rotation of the shaft of the coiler. On the intermediate link 8 of the variator, the code plate 24 is rigidly fixed, which interacts with the optocoupler sensor 25 of the gear ratio of the variator.

The control circuit (Fig. 2) consists of three functional units interconnected with each other and with a film projector: power supply unit 26, control unit 27 and processing unit 28. The processing unit 28 is connected to sensors 23 for the speed of rotation of the shaft of the coiled roll 6, sensor 25 for the gear ratio of the variator and limit switches 29 and 30, which limit the movement of the intermediate link 8 of the variator. A motor 1, an autonomous electric drive 16, and an electromagnetic drive 21 are connected to the control unit 27.

The operation of the device is as follows.

From the inner hole of the unwinding roll 12, the required number of turns of the film is removed, the tape path of the film projector (not shown) is charged, and the end of the film is fixed to the core of the reel.

When turning on the film projector,. electrically connected to the control unit 27, the winder motor 1 is turned on from the latter and, through the gears 2-5, begins to rotate the shaft of the winding roll 6 and the variator drive cylinder 7, from which the variator and gears 10 and 11 lead through intermediate link 8 the rotation is transmitted to the shaft of the unwinding roll 12.

during the start-up period, the reel 12 has a large moment of inertia and during acceleration there is slippage between the links 7-9 of the variator, and the unwinding roll 12 takes a very long rotational speed for a very long time, which causes the coils of the unwinding reel 12 to twist. switching on the electric motor 1 by the control unit 27 turns on the electromagnetic drive 21 and the clutch 20 closes, creating a rigid connection of the shaft of the expandable roll 12 through gears 18 and 19 with the shaft roll out roll 6 for the required acceleration time. After a brief acceleration of the roll 12, the control unit 27 opens the sleeve 20 by turning off the electromagnetic drive 21.

Further operation of the device occurs through the variator 7, 8, 9. In the process of the device operation, the required gear ratio between the shafts of the wadding roll 6 and the wickable roll 12, determined by the ratio of the inner diameter of the crushable and the outer diameter of the worn rolls, changes. A step change in the gear ratio is adopted in the device. To control the change in gear ratio, the processing unit 28 is used, using the information about the rotational speed of the shaft of the following roll 6, received from the proximity sensors 23, has an inductive coupling with an asterisk 22.

When the shaft reaches a predetermined rotational speed, the comparison circuit of the processing unit 28 generates a control signal from the output of the processing unit 28 to the input of the control unit 27. The control unit 27 turns on the electric motor 16, which rotates the lead screw 15 and moves the intermediate link 8 of the variator to the next fixed position encoded on the code plate rigidly connected to it 24. The signal from the gear ratio sensor 25 is written to the code plate 24, is fed to the input of the processing unit 28, and from the output of the processing unit 28 to the input of the control unit 27, which turns off the electric motor 16.

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With an increase in the diameter of the coil 6 of the coiler, the speed of its rotation decreases, and consequently, the speed of rotation of the sprocket 22 and the frequency

 pulses from sensors 23 that are installed in antiphase with respect to the sprocket 22 in the processing unit 28. When this frequency reaches the Qth of the threshold corresponding to the next control stage, the electric motor 16 is turned on and moves the intermediate link 8 to the next position. Simultaneously moving

and code plate 24, the signal corresponding to the next position, from the gear ratio sensor 25 enters the processing unit 28, and the electric motor 16 goes off through the control unit 272. The variator continues to operate with a constant gear ratio to the next control step. During this time, the loop of the film in

25, the inner bore of the spreadable roll 12 retains the allowable length.

Claims (1)

Invention Formula An unwinding device for a roll of a tape carrier with its unwinding from the middle, containing holders of unwinding and winding rolls mounted on shafts kinematically interconnected and driving a roll to be worn, characterized in that, in order to increase the reliability of the device operation with rolls wound on the standard cores, the kinematic connection between the shafts of the windable and unwinding rolls is made in the form of a conical variator, and additional device is additionally introduced into the device kinematic connection between the shafts, sensors of rotational speed of the shaft of a reel to be wound, a variator gear ratio sensor, a control circuit and an actuating electromechanical device, the leading link of the variator connected to the shaft of the reel to be rolled conical, and on the intermediate link, in contact with the master and the slave units and connected with the autonomous electric drive, the code plate is rigidly fixed thirty 35 40 45 50 55