RU1783464C - Device for film indication in film-pulling section of photocamera - Google Patents

Abstract

The invention relates to the field of photography, and in particular to structural elements of cameras, and can be used in cameras whose shutters are controlled by electric current pulses, and mainly in frame aerial cameras. The invention allows to solve the following problems: to improve the quality of aerial photography materials by providing aerial photography with longitudinal overlapping of aerial photographs that are minimally different from the set, at intervals shorter than the work cycle, to exclude aerial photographing with overlapping frames on the frame. Make it easy

Description

structure and simplify maintenance; to increase the reliability of operation, to extend the life of the aerial camera and to increase the automation of the aerial photography process. The device contains 1 photoelectric sensor (1). 1 amplifier-driver (2), 1 frequency divider (3), five electronic keys (4-8), three circuits (9-1), pulse delays, two circuits (13, 14), pulse width extensions, switch ( 15) electronic, 1 counting unit (27) and 1 indication unit (16), 1 pulse generator (17), two triggers (18, 19), 1 power amplifier (20), 1 time relay (21), 1 engine ( 22) electric, 1 decoder (24), four match circuits 25-28, two setters (29, 30), frames with encoders, 1 end-of-life sensor (31), 1 multivibrator (32), 1 discriminator (33), 1 block (34), controls, 1 block (3) exhibit Avani, 1-2-9, 2-28-18-20-22, 2-3-18, 3-23, 3-4-16, 23-24-26-6-16. 24-25-5-16, 29-25, 30-26.17-9-28.15-13-10-21-22.34-15.15-15-10-21-22, 34-15, 15-13-33-14-16: 31-32-33, 32-27, 13-27-7-35, 27-11-19-8-12, 15-19. 2 silt

The invention relates to the field of photography, and in particular to structural elements of cameras, and can be used in cameras whose shutters are controlled by electric current pulses, and mainly in frame aerial cameras.

Known devices for indicating the movement (rewind) of aerial film in the tape path of an aerial camera. Mechanical and electrical signaling devices are used to indicate normal rewind of aerial film

The most advanced technical solutions are electrical signaling devices, which are various designs, making and breaking contacts when rewinding aerial film. Through the contacts, pulses are sent to the electric incandescent lamp, signaling the rewind of the aerial film. During the shutdown of the aerial film or when it breaks, the lamp burns continuously or goes out depending on the position of the contacts in the cartridge. The main disadvantages of existing aerial rewind signaling devices are the lack of indication of insufficient rewind of aerial film, which leads to overlapping of the frame when taking photographs, and lack of information about a breakage or jamming of aerial film.

Rewinding aerial film, leading to the overlapping of the frame on the frame, creates the illusion of the normal operation of the aerial camera and causes the unproductive expenditure of expensive aerial film, means, forces and time for its chemical-photographic processing and to failure to complete the task, because the resulting air photography materials are not of practical value due to their poor quality. In this case, it is necessary to take into account the costs associated with the rental of the aircraft and its operation, which has become especially important in the current economic conditions.

In existing designs of aerial cameras, photo shutters, as a rule, are triggered by electrical impulses coming from a command device (control panel) regardless of the presence of aerial heating in the cassette (1, 2). In the absence of aerial film in the cassette or during its breakage, as well as during rewinding with the overlay on the frame, the shutter release electromagnet will still work when the pulse comes from the control panel. This leads to premature wear of the shutter mechanism and other parts, which significantly reduces the lifetime of the aerial camera .

With known and constant parameters of the aerial camera and the flight of the carrier of the camera, the aerial photography interval is determined by the known dependence

where T is the aerial photography interval, s;

I is the length of the longitudinal side of the aerial photograph, cm;

f is the focal length of the lens, I, M;

H — photographing height, m;

W is the travel speed of the carrier photo equipment, m / s;

P is a given longitudinal overlap equal to one hundredth of a percent.

From formula (1) it can be seen that the main variables that affect the value of the aerial photography interval for a given percentage overlap are the height and ground speed of the carrier of the camera, or rather their ratio

H / w. The principle of measuring this ratio and, therefore, determining the interval is the basis for the construction of various semi-automatic command devices (control panels) (3, 4),

A decrease in the photographing height or an increase in the traveling speed of the carrier of the photographic equipment causes a decrease in the photographing interval T, which can become comparable to or even shorter than the cycle time of the aerial camera Tc. If T becomes less than Tc, this will lead to a decrease in the specified longitudinal overlap of aerial photographs P, which is one of the indicators determining the accuracy of stereophotogrammetric measurements and the quality of aerial photographs. For topographic purposes, the longitudinal overlap P is set at 60%, 80% and 90% with tolerances of units of percent. For non -ographic purposes, in order to avoid a gap between aerial photographs, due to errors in piloting the photo equipment carriers, the longitudinal overlap is set to 20-30%. The gap between aerial photographs can lead to the fact that a small-sized selectable object is not displayed on the aerial photograph, which would be tantamount to a task failure.

If aerial photography is performed with an aerial photography interval T greater than or equal to the cycle time of the aerial camera Tc, i.e. T Tc (Figs. 1a, 1b), the longitudinal overlap value will be maintained at a predetermined value (n is the number of revolutions of the aerial camera electric motor). If (Fig. 1, c), then the longitudinal overlap will become less than the specified value.

Let us estimate how much the predetermined value of the longitudinal overlap changes at. Let aerial photography be performed with an AFA-41/20 type aerial camera with a focal length of the lens cm, length of the longitudinal side of the aerial photograph, cm, aerial photography interval s,, aerial photography height m.

Under these conditions, the traveling speed of the carrier of the camera, taking into account formula (1), will be equal to

| Ј1

Tf

P) N 18 (1-0.6) 500 2-20

 90 m / s 324 km / h. While aerial photography, the track speed increased and became equal

341 .7 m / s. The shooting interval was reduced to a value of T-1.9 s. In this case, part of the pulses will come from the control panel into the camera of the aerial camera during its operation cycle, i.e.

shutter release solenoid

will occur through 1 pulse of FIG. 1.

at). This will lead to a two-fold increase.

times the aerial photography interval and the reduction of longitudinal overlap. Let us estimate the value of the longitudinal overlap P at an aerial photography interval T shorter than the duration of the cycle of work of TC.

By account (1) for our example, we can

write down

P 1 TW f

13, 8-94.7-20

W 18-500 1-0.8 0.2 20%.

Therefore, in this case, aerial photography will be performed with longitudinal overlapping of aerial photographs, i.e. three times less than the set.

An analysis of the results of the performed calculations confirms that at intervals of aerial photography shorter than the duration of the aerial camera’s cycle of operation and given longitudinal overlaps

aerial photographs 60; 80; 90%, the actual longitudinal overlap of aerial photographs will be 20; 60 and 80% respectively.

Studies show that for

to stabilize the longitudinal overlap of aerial photographs P at aerial photography intervals shorter than the work cycle, it is necessary to increase the aerial photography interval artificially by

DT, such (Fig. 1, d), so that T +. (2)

Indeed, if in our example we delay the impulse coming from the control panel until the end of the operation cycle of the zerophotocamera T (1.9 + 0,, 0 s), then the longitudinal overlap will be equal to

P 1 TW f

IH 1 - 0.42 0.58

12-94 .7-20

18-500 58%,

those. accounts for 97% of a given longitudinal overlap of aerial photographs. At present, there are no devices that ensure preservation of a given longitudinal overlap of aerial photographs with such accuracy at aerial photographing intervals smaller than the operation cycle of the aerial camera.

Information on the number of frames of the remaining unexposed aerial film is very significant. Devices are known for determining this parameter using various counters. The most widely used devices are mechanical meter meters (1) and electromechanical meters of unexposed frames (2). The existing disadvantages of these devices do not meet the requirements for determining this important parameter at present.

Existing aerial camera designs do not have devices informing operators that the planned number of frames has been exposed, and aerial photography with this aerial camera must be stopped.

The closest in technical essence to the proposed invention (its prototype) is a device according to ed. ev, USSR N 1307433, 1987. It includes the following elements: photoelectric sensor, amplifier driver, frequency divider, five electronic keys, three delay circuits, pressure table control unit, pulse width extension circuit, display unit, switch, pulse generator, a trigger unit, a comparator, a power amplifier, a time relay, an engine, a counting unit, a decoder, two match circuits and two frame encoders with encoders.

The main disadvantages inherent in this device are: the lack of signaling about the start of aerial photography with a longitudinal overlap of aerial photographs less than a predetermined one; the inability to stabilize the longitudinal overlap of aerial photographs at aerial photography intervals shorter than the cycle of operation of the aerial photograph; shutting down the aerial camera after exposing a certain number of frames, which is not always advisable.

An object of the invention is to increase the accuracy and reliability of an indication.

This goal is achieved by the fact that the proposed device contains a photoelectric sensor, the output of which is connected to the input of the amplifier-former, the output of the amplifier-former is connected to the first inputs of the first delay circuit, the fourth matching circuit, the input of the frequency divider, the output of the pulse generator is connected to the second input of the first circuit delays, the output of which is connected to the first inputs of the electronic switch,

the display unit and the second input of the fourth matching circuit, the output of which is connected in series with the first input of the first trigger, the inputs of the power amplifier and the electric rewind motor, the output of the frequency divider is connected to the second input of the first electronic key, the second input of the display unit and connected in series with the inputs

0 block counting, decoder, the first inputs of the first and second matching circuits, the second inputs of which are connected to the outputs of the first and second frame adjusters, respectively, the output of the first circuit coincides 5 in series with the input of the second electronic and third input of the display unit, the output of the second matching circuit in series connected to the input of the third electronic key and the fourth input of the display unit, the output of the control panel of the aerial camera is connected in series with the second input of the electronic switch onnogo first vho- g house second flip-flop, the inputs of the fifth key

5 of the electronic and the pressure table unit, the second output of the electronic switch c is connected to the input of the first pulse width extension circuit, the output of which is connected in series with the inputs

0 of the second delay circuit, the time relay and the electric film rewind motor, is connected in series with the first input of the discriminator, the input of the second extension circuit duration

5 pulses, the fifth input of the display unit, is connected to the first input of the third matching circuit, the output of the end of cycle sensor is connected to the input of the multivibrator, the output of which is connected to the second

With the inputs of the discriminator and the third matching circuit, the output of the third matching circuit is connected in series with the input of the third delay circuit and the second input of the second trigger, sequentially connected with the inputs of the fourth electronic key and exposure unit.

The difference between the proposed device from the prototype is that additionally introduced scheme.

0 pulses, two matching circuits, aerial camera end-of-life sensor, multivibrator and discriminator.

The use of new elements and connections gives the proposed device new

5 properties leading to an increase in the quality of aerial photographing materials, expansion of operational capabilities, simplification of the design of the tape path by eliminating the friction of the receiving coil, reducing the time, C1 l and

costs of its maintenance, signaling the start of aerial photography with aerial photography intervals shorter than the work cycle, while maintaining a longitudinal overlap of aerial photographs that is minimally different from the set, increasing the life of the aerial camera and increasing reliability.

Improving the quality of aerial photography materials is ensured by maintaining a longitudinal overlap of aerial photographs, which is minimally different from the set, at intervals of aerial photographing shorter than the aerial camera’s operating cycle, which excludes aerial photography with gaps between aerial photographs and ensures high accuracy stereophotogrammetric measurements.

The expansion of operational capabilities and the service life of the aero camera is ensured by eliminating the operation of the pressure table, the shutter and the electric rewind motor of the aerial film in the absence or jamming of the aerial film in the tape path of the aerial camera. This is ensured by the joint operation of the pulse generator, the first delay circuit, the electronic switch, opening the electrical circuits from the control panel of the aerial camera to the shutter release electromagnet and the electromagnetic pressure table in the absence, breakage or jamming of aerial film, and the fourth matching circuit and the first trigger shut off the electric rewind engine aerial films

Simplification of the design of the aerial camera and reduction of time, effort and maintenance costs are ensured due to the rigid connection of the electric rewind motor of the aerial film with the flange of the receiving coil, which made it possible to exclude friction from the design, and therefore its adjustment and tuning during operation

The signaling of the beginning of aerial photography with an aerial photography interval shorter than the aerial camera’s operating cycle is carried out by means of a discriminator and a second pulse width extension circuit that illuminates the red LED in the display unit and stabilizes a given longitudinal overlap of aerial photographs under the same aerial photography conditions due to the connection of the end of cycle sensor, multivibrator and the third

matching circuits providing a delay of the pulse coming from the output of the control panel for the time necessary to complete the cycle of operation of the aircraft 5.

In FIG. 2 is a structural diagram of a device.

It is indicated on it: 1 - photoelectric sensor, 2 - amplifier-driver, 3 - frequency divider, 4-8 - first, second, third, fourth and fifth electronic keys, respectively, 9-11 - first, second and third of the delay, respectively 12 - b / tk of the pressure table, 13-14 - first

5 and the second pulse duration extension circuit, respectively, 15 — electronic switch, 16 — display unit, 17 — pulse generator, 18-19 — first and second triggers, respectively, 20 — power amplifier, 21 — time relay, 22 — electric motor, 23 - counting unit, 24 - decoder, 25-28 - first, second, third and fourth matching schemes, respectively, 29-30 - first and second frame encoders with encoders, respectively, 31 - end-of-life camera aerial sensor, 32 - multivibrator, 33 - discriminator, 34 - remote control aerof toapparata, 35 - unit

0 exposure.

The photoelectric sensor 1 is designed to generate electrical signals when rewinding aerial film in the tape path of the aerial camera.

5 The driver amplifier 2 is used to generate rectangular pulses of the required amplitude from the signals coming from the output of the photoelectric sensor 1,

0 Frequency divider 3 is designed to form one pulse from ten pulses coming from the output of the amplifier-former 2.

The first electronic key 4 serves to

5 to provide a green LED in the display unit 16, indicating normal rewind of the aerial film.

The second electronic key 5 is designed to illuminate the orange LED in the display unit 16, indicating a limited frame remaining of unexposed aerial film.

5 The third electronic key 6 serves to illuminate the red LED and the audible siren, indicating that the planned number of frames is exposed and the aerial camera must be stopped.

The fourth electronic switch 7 is designed to match the low-current circuit of the third matching circuit 27 to the trigger circuit of the photo-shutter in the exposure unit 35.

The fifth electronic key 8 is used to turn on the electromagnet lowering the pressure table in block 12 upon receipt of a pulse from the output of the second trigger 19.

The first delay circuit 9 is designed to operate the fourth matching circuit 28 during normal rewinding of the aerial film, and also to turn off the switch 15 of the electronic and intermittent illumination of the red LED in the indication unit 16 when the aerial film breaks or seizes.

The second delay circuit 10 serves to provide a delay in starting the motor. l 22 electrically rewind the aerial film for the time necessary for the electromagnet to operate the shutter in the exposure unit 35 and to raise the pressure table in the unit 12.

The third delay circuit 11 is designed to delay the action of the lowering signal of the presser table for the time required to trigger the electromagnet in the exposure unit 35.

The presser block 12 serves to fix the aerial film in the tape path of the aerial camera relative to the leveling glass.

The first pulse width extension circuit 13 is designed to enable the release of the shutter electromagnet after the time required to lower the pressure table has expired.

The second pulse duration extension circuit 14 serves to increase the pulse duration to a value necessary for normal illumination in the red LED indication unit 16, indicating the start of aerial photography with an aerial photography interval shorter than the aerial camera operation cycle.

The electronic switch 15 is designed to allow the signal to pass from the output of the aerial camera control panel 34 to the exposure unit 35 during normal rewind of the aerial film and to prevent its passage when the aerial film breaks or seizes.

The indicating unit 16 serves to accommodate four LEDs, an audible siren and a multivibrator. Multivibrator

provides a change in the duration of the glow of the LEDs. The green LED indicates normal rewind of the aerial film, and the orange LED indicates a limited remaining frame of unexposed aerial film. One of the red LEDs indicates the beginning of aerial photography with aerial photography interval T,

0 less than the duration of the operation cycle of the aerial camera TC, i.e. about aerial photography with a longitudinal overlap P less than the specified R. Another red LED and a sound siren signal 5 indicate that the planned number of frames is exposed, and aerial photography with this aerial camera must be stopped.

The pulse generator 17 is designed

0 to generate pulses of a certain amplitude and frequency.

The first trigger 18 is used to generate signals for controlling the operation of the aerial film rewind motor 22.

The second trigger 19 is designed to generate signals that control the operation of the pressure table in the block 12 of the pressure table,

0 A power amplifier 20 serves to ensure the operation of the aerial film rewind motor 22 by amplifying the electrical signals from the output of the first trigger 18.

5 The time relay 21 is designed to keep the aerial film rewind engine 22 in operation until a signal appears at the output of the first trigger 18.

0 Electric motor 22 is used to rewind aerial film. A counting unit 23 is used to set the total and count the remaining number of unexposed frames. In him

5, a pulse generator is provided for setting the total number of frames to be exposed; a counter and a counter indicator showing the current value of the remaining unexposed frames.

The decoder 24 serves to translate the binary decimal counter code into the decimal indicator code and supply it to the inputs of the first and second circuits 25, 26 in coincidence.

The first and second coincidence circuits 25, 26 are intended for selection of decimal numbers in accordance with the data set on the first and second sensors 29-30 frames, respectively.

The third matching circuit 27 serves to delay the pulse coming from the output of the aerial camera control panel 34 until the end of the aerial camera cycle.

A fourth matching circuit 28 is provided to enable the electric film rewinding engine 22 to function normally during normal rewinding.

The first frame adjuster 29 serves to set the number corresponding to the number of frames, upon reaching which an orange LED will light up in the display unit 16, indicating the remainder of a limited number of frames of unexposed aerial film.

The second frame adjuster 30 is designed to set the number corresponding to the number of frames, upon reaching which the audible siren will turn on in the display unit 1b and the red LED will light up, indicating that the planned number of frames has been exposed and the aerial photography with this aerial camera needs to be stopped.

The end-of-life sensor 31 is used to generate a signal after the end of the operation of the aerial camera.

The multivibrator 32 is designed to convert the signal from the output of the end-of-life sensor 31 into a short pulse of a rectangular shape.

The discriminator 33 serves to determine the time sequence for the arrival of signals from the outputs of the control panel 34 and the end-of-life sensor 31 of the aerial camera.

The control panel 34 of the aerial camera is designed to generate control signals at intervals that are determined by the parameters of the flight and the photographing system.

The exposure unit 35 serves to expose the aerial film by triggering a photo shutter controlled by pulses from the output of the control panel 34 of the aerial camera through the electronic circuit of the device of the invention.

The photoelectric sensor 1 consists of an optocoupler pair and a modulator, which is a disk with holes located at its periphery. The modulator is rigidly connected to the axis of the metering roller. The diameter of the disk and the number of holes in it are selected so that when rewinding the aerial film to a length equal to

the size of one frame with an interframe gap, ten pulses were input to the frequency divider 3. This number of pulses provides the simplest

the execution of the subsequent part of the electronic circuit.

In addition to the above, the remaining elements of the proposed device can be performed using

0 standard microcircuits, transistors, switches and microswitches:

amplifier-driver, frequency divider, delay circuits, pulse generator, estimated unit, decoder, circuits

5 coincidence, pulse width extension circuits and triggers are assembled using the appropriate chip types;

electronic keys and switch,

0, an indication unit, a power amplifier, a time relay, and a multivibrator are assembled on transistors, and frame adjusters are assembled on switches x;

the end-of-life sensor of the aerial camera 5 is assembled on the microswitch;

discriminator can be performed using logical elements of the type AND-OR;

0 presser table and exposure units are aerial camera units

a control panel is included with the aerial camera;

as an aerofo5 rewinder, a direct current electric motor is used.

The nodes of the device discussed above have the following connections in a static state.

0 The output of the photoelectric sensor 1 is connected to the input of the amplifier-former 2, the output of which is connected to the first inputs of the first delay circuit 9, the fourth circuit 28, and the input of the frequency divider 3.

5, the output of the pulse generator 17 is connected to the second input of the first delay circuit 9, the output of which is connected to the first inputs of the electronic switch 15, the indication unit 16, and the second input of the fourth circuit 0 of coincidence 28, the output of which is connected in series with the first input of the first trigger 18, amplifier 20 power and motor 22 electric rewind aerial film, output divider 3

5, the frequency is connected to the second input of the first trigger 18, connected in series with the input of the first electronic key 4, the second input of the display unit 16, connected in series with the inputs of the counting unit 23, the decoder 24, the first inputs of the first and second matching circuits 25-26, the second inputs of which connected to the outputs of the first and second setters 29-30 frames, respectively, the output of the first matching circuit 25 is connected in series with the input of the second electronic key 5 and the third input of the display unit 16, the output of the second matching circuit 26 it is connected to the input of the third electronic key 6 and the fourth input of the display unit 16, the output of the aerofactor control unit 34 is connected in series with the second input of the electronic switch 15, the first input of the second trigger 19, and the inputs of the fifth electronic. the key 8 and the block 12 of the pressure table, the second output of the electronic switch 15 is connected to the input of the first pulse width extension circuit 13, the output of which is connected in series with the inputs of the second delay circuit 10, the time relay 21 and the aerial film rewind motor 22, connected in series with the first the input of the discriminator 33, the input of the second pulse width extension circuit 14, the fifth input of the display unit 16, is connected to the first input of the third match circuit 27, the output of the end of operation cycle sensor 31 is connected to the input of the multivibrator 32, the output of which is connected to the second inputs of the discriminator 33 and the third coincidence circuit 27, the output of the third coincidence circuit 27 SEQUENTIAL 6s is connected to the input of the third delay circuit 11 and the second input of the second trigger 19, connected in series with the inputs of the fourth electronic key 7 and exposure unit 35.

The operation of the proposed device is as follows.

During pre-flight preparation of aerial equipment or in flight, before the aerial photography starts, the number corresponding to the number of frames that can be exposed during aerial photography is set on the frame counter located in the counting unit 23.

A number corresponding to the number of unexposed frames is set on the second frame master 30, upon reaching which the sound siren will turn on in the display unit 16 and the red LED will start to light, indicating a predetermined amount of unexposed frames. This balance is the sum of the number of unexposed frames necessary for: testing the operation of the aerial camera at

post-flight preparation, imprinting of the sensitometric wedges after discharging the cartridge; test manifestation before chemical photographic treatment of exposed aerial film.

On the first frame setter 29, a number corresponding to the number of frames is set, upon reaching which the orange LED will start to light in the display unit 16, indicating a limited remnant of aerial film that can still be exposed by this aerial camera

When performing aerial photography, two modes of operation are possible:

the aerial photography interval is greater than or equal to the operating cycle of the aerial camera, i.e., T TC;

the aerial photography interval is less than the cycle of the aerial camera, i.e.

Consider the operation of the device in each of these modes

If the aerial photography interval is greater than or equal to the aerial camera’s operating cycle, then when the aerial camera is turned on, the signal from the output of the ejector 31 ending the work cycle through the multivibrator 32 will be the first to arrive at one of the inputs of the third matching circuit 27 and discriminator 33. The pulse from the output of the aerial camera’s control panel 34 through an open electronic switch 15 will go to one of the inputs of the second trigger 19 and to the input of the first pulse width extension circuit 13. At the output of the second trigger 19, a signal is received which is open through e key 8 electronic will provide the operation of the electromagnet in the block 12 of the pressure table. Because in the initial state, the pressing table was in the raised state, then when the electromagnet is triggered, the pressing table will lower and press the aerial film tightly against the leveling glass, thereby ensuring its alignment. Another input of the third coincidence circuit 27 will receive a pulse from the output of the first circuit 13 for expanding the pulse duration by the time necessary to lower the pressure table, which excludes the release of the shutter release electromagnet when the pressure table is raised. At the output of the third matching circuit 27, a signal of a logical unit arrives to the shutter release electromagnet in the exposure unit 35 through the fourth key 7 is electronic, thereby providing exposure of the aerial film. Simultaneously with the release of the third

match circuit 27, this signal through the third delay circuit 11 is fed to another input of the second trigger 19 and puts it in its original (initial) position. In this case, the electromagnet in the block 12 is de-energized and the pressure table returns to the (lower) state under the action of the spring.

The pulse from the output of the first pulse width extension circuit 13 is supplied to another input of the discriminator 33 and to the input of the second delay circuit 10. This pulse arrives at the discriminator 33 after the pulse arrives from the sensor 31 of the end of the aerial camera operation cycle. Such a pulse arrival sequence eliminates the glow of the LED in the display unit 16, signaling a decrease in the longitudinal overlap of the aerial photographs. The pulse from the output of the second delay circuit 10 is supplied through the time relay 21 to the aerial film rewind electric motor 22. Relay response time

21 time is set for a period of time equal to the duration of the passage of an opaque portion between two adjacent holes in the disk of the photoelectric sensor 1. Upon receipt of the signal, the electric motor 22 will begin to rewind the aerial film through the measuring roller, the rotation of which is transmitted to a rigidly connected disk with holes (modulator), which modulates the light flux in the optocoupler pair of the photoelectric sensor 1. Generated in this case in the sensor 1 signals, the amount of which is proportional to the length of the rewound aerial film, is fed to the input of the amplifier-former 2. The pulses from the output of the amplifier-former 2 are applied to one of the inputs of the first delay circuit 9, to the input of the frequency divider 3 and to one of the inputs of the fourth matching circuit 28, the other input of which receives a signal from the output of the first delay circuit 9. At the output of the fourth matching circuit 28, a signal arrives at one of the inputs of the first flip-flop 18, which provides operation of the aerial rewind electric motor 22 through the power amplifier 20. Electric motor operation

22 rewinding of aerial film will continue until rewinding aerial film of a length equal to the size of one frame with an inter-frame gap. During this time, ten pulses are received from the output of the amplifier-former 2 to the input of the frequency divider 3.

After the arrival of the tenth pulse, a pulse is generated at the output of the frequency divider 3, which will be transmitted to the other input of the first trigger 18 and to the inputs of the first key 4 of the electronic and counter unit 23. The first trigger 18 is reset to this initial state, which causes the control circuit of the aerial film rewind electric motor 22 to open. The electric motor 22 will stop, rewinding of the aerial film will stop. The pulse from the output of the frequency divider 3 will ensure that the first electronic key 4 is triggered, and in the display unit 16 the green LED lights up, signaling that the film is normally rewound in the tape path of the aerial camera. The pulse from the output of the frequency divider 3 to the input of the counter unit 23 reduces the counter reading by one, which corresponds to the exposure of the next frame, as indicated by the counter indicator. From the output of the block 23, the counting information in binary code is input to the decoder 24, and from the output of the last to the inputs of the first and second match circuits 25, 26.

The pulses from the output of the frequency divider 3 are also transferred (zeroing) the entire electronic circuit to its original state, i.e. it is prepared for a new cycle of work.

If the remaining number of unexposed frames is equal to the value set on the frame master 29, the first matching circuit 25 will work, the second key 5 will open, the electronic key 5 will open, and the orange LED will light up in the display unit 16, indicating the limited remaining unexposed frames.

If the remaining number of unexposed frames is equal to the value set on the frame master 30, the second matching circuit 26 will work, the third key 6 will open, the electronic key 6 will open, and the audible siren will turn on and the red LED will light up, signaling that the planned the number of frames is exposed, and aerial photography with this aerial camera must be stopped.

If the aerial film is broken or stuck in the tape drive path of the aerial camera, pulses from the output of the amplifier-former 2 will stop. Therefore, after the arrival of the third pulse from the output of the pulse generator 17 to the synchronization input of the first delay circuit 9, a logic zero signal is received at its output. This signal will disable the electronic switch 15 open

the electric circuit from the control panel 34 of the aerial camera to the trigger electromagnet of the photo shutter and will provide an intermittent glow of the red LED in the display unit 16, which is signaled of a broken or jammed aerial film. At the output of the fourth matching circuit 28, a logic zero signal also appears, the first trigger 18 will remain in its original state, and the aerial film rewind motor 22 will not turn on.

If the aerial photography interval becomes less than the aerial camera operation cycle, then when the aerial camera is turned on, the pulse from the output of the control panel 34 through the open switch 15 will go to one of the inputs of the second trigger 19 and to the input of the first pulse width extension circuit 13. At the output of the second flip-flop 19, a signal is received which, through the open fifth electronic key 8, will ensure the operation of the electromagnet in the block 12 of the pressure table. The presser table lowers and presses the aerial film firmly against the leveling glass. One of the inputs of the third match circuit 27 and discriminator 33 receives a pulse from the output of the first pulse width extension circuit 13. This pulse will be recorded in the third match circuit 27. After the end of the aerial camera’s operating cycle, the signal from the output of the end-of-cycle sensor 31 through the multivibrator 32 will go to the other inputs of the third match circuit 27 and the discriminator 32. With this sequence of pulses arriving at the inputs of the discriminator 32, a signal closes the red LEDs supply circuit, located in the display unit 16. The LED will begin to light, indicating that aerial photography is being performed with a longitudinal overlap of aerial photographs less than a predetermined one. At the output of the third match circuit 27, a logic unit signal is generated. This signal through the fourth key 7, the electronic will go to the shutter release electromagnet, the operation of which will provide exposure of the next frame.

Therefore, at aerial photography intervals shorter than the operation cycle of the aerial camera, the proposed device artificially increases the aerial photography interval by an amount such that their sum becomes equal to the operation cycle of the aerial camera, i.e.

T +.

As noted above, this ensures a minimum deviation of the values of the resulting longitudinal overlap of aerial photographs from a predetermined one.

After the exposure of the next aerial film frame, the further operation of the device is similar to that in the first mode, i.e. when T TT.

0 This mode and the LED on the display unit 16 indicating aerial photography with longitudinal overlapping of aerial photographs less than the specified one will continue until the aerial photography interval is equal to or greater than the aerial camera operation cycle. This can happen when the speed of the carrier of the photo equipment decreases or the altitude increases.

0 aerial photography. Then the work of the proposed device will correspond to the work in the first mode.

The device is returned to its initial state using the button

5 in the counter unit 23, grounding the frame counter circuit. The device provides for checking the operability of LEDs and sirens in the sound and light alarm circuits. Such verification is carried out at

0 preparing photographic equipment for flight and, if necessary, in flight.

The proposed technical device compares favorably with the prototype (ed. Certificate No. 1307433, USSR) with new elements and

5 communications, the implementation of which allows signaling the onset of the aerial camera operation cycle, while ensuring a minimum deviation of the longitudinal overlap of aerial photographs from

0 given; to expand the operational capabilities of the aerial camera by eliminating the operation of the pressure table, photo shutter and electric motor in the absence or jamming of aerial photos5 in the tape path of the aerial camera; to simplify the design of the aerial camera by eliminating the clutch of the receiving coil, and therefore to reduce time, effort and cost,

0 necessary for its adjustment, adjustment and maintenance during operation.

The achieved technical effects can significantly improve the quality of aerial photographs due to

5 timely informing about the start of aerial photography with longitudinal overlap of aerial photographs less than the specified one, and providing aerial photographs with the minimum deviation of the longitudinal overlapping of aerial photographs from the set at aerial photography intervals shorter than the work cycle; to simplify the design of the aerial camera and to facilitate the conditions of its maintenance and operation; increase reliability and increase the lifespan of the aerial camera; to further enhance automation of the airbrushing process.

The expected technical and economic effect of the use of the proposed device can be judged at least on the basis of the example considered below, based on real data.

Let aerial photography be carried out with an AFA-41/20 aerial camera. charged aerial film type 22 measuring 19 6000 cm. Flight duration is two hours. In ground preparation, the aerial photography interval was determined to be 2.0 s. and this value was installed on the command device. The actual aerial photography interval was 1.9 s. So, based on the previously given calculations, the actual longitudinal overlap of aerial photographs is not specified (60%). but only (20%) Such material will not be accepted by the customer due to its poor quality.

The device is designed to work in low temperature conditions, provides remote indication and can be installed on existing cameras designed for space and aerial photography, without significant changes in their design

Claims (1)

The claims A film indicating device in the tape path of the camera, comprising a series-connected photoelectric sensor, a driver amplifier, a first delay element, a switch, a first pulse resolution unit and a second delay element, a pulse generator connected to another input of the first delay element, a control unit, an output which is connected to the second input switch: 1 antenna, the first input of which is connected to the third input of the display unit, a time relay connected between the output of the second element delays and one input of the rewind motor, the other input of which is connected to the output of the power amplifier, the pressure table unit, the input connected to the output of the first key, the frequency divider, the output connected to the input of the second key, the first input of the first trigger and through the counting unit and decoder with the first the inputs of the first and second elements And, the outputs of which are connected to the corresponding two inputs of the display unit, and the second inputs to the outputs of the first and second frame adjusters, the second trigger, third key and third e a delay element, characterized in that, in order to increase the accuracy and reliability of the indication, the third and fourth elements And, serially connected end-of-camera sensor, a multivibrator, a discriminator and a second pulse expansion unit, the output of which is connected to the fourth input of the indication unit, are introduced into it , exposure unit, the input of which is connected through the third key to the output of the third AND element and through the third delay element - with one input of the second trigger, the other input of which is connected to the second output at the switch, and the output is to the output of the first key, while one input of the third AND element is connected to the output of the multivibrator, the other input is to the output of the first pulse expansion unit, to the other input of the discriminator and to the input of the second delay element, the output of the first delay element is connected through the fourth element And with the second input of the first trigger, the output of which is connected to the input of the power amplifier, the output of the amplifier-former is connected to another input of the fourth element And to the input of the frequency divider, and the output of the second key is connected with the fifth input of the display unit. MF