SU711646A1 - Method of regulating the brightness of images of objects on the screen of image amplifier - Google Patents

Description

one

FIELD OF THE INVENTION The invention relates to radio engineering and can be used in i-fusion amplifiers when observing light-emitting objects of varying brightness.

A known method of adjusting the brightness of the image, concluding in converting the brightness of the screen into an electrical signal and changing the supply voltage of the image amplifier l.

However, with the known method, the possibilities of adjusting the luminance at the output of the amplifier are limited, and the image quality when using luminance amplifiers with electromagnetic focusing is not good enough.

The purpose of the invention is to enhance the image quality.

For this, the method of adjusting the brightness of the image of objects on the screen of the image amplifier, which consists in converting the brightness of the screen to an electrical signal and changing the voltage of the power of the image amplifier, form the maximum and minimum

the values of the electrical signal, compare the current values of the electrical signal with its maximum and minimum values and, at the moments of their equality, form the first and second control signals, each of which jumpwise, respectively, reducing or increasing the supply voltage. nor an image amplifier by an amount that provides a predetermined resolution of the image amplifier.

The drawing shows the structural electrical circuit of the device for implementing the proposed method. .

Claims (1)

The device contains an image brightness sensor 1, sensors of the upper 2 and lower 3 levels, a counter 4, an initial code setting device 5, a code 6 analogue converter, a power source 7 and an electron-optical converter (EOC) 8. The output of the image brightness sensor 1 is connected to the inputs of the sensors of the upper 2 and lower 3 levels of image luminance, the outputs of which are connected respectively to the inputs -1 and + of the counter 4 codes, the inputs of which are connected to the code inputs of the converter 6 code - analog, the analog inputs of which are connected to the source 7 p Tani, while the output - to the image intensifier 8. The method is carried out about once sledugsschim. Set the limits of intervals for allowable fluctuations in the output screen of the amplifier, record the brightness of the glow, and as the brightness value coincides with one of the boundary values, the values of the power supply voltage and magnetic field change impulsely, returning the brightness value to within the interval. In order to make the brightness of the screen, for example, with the lower margin of the interval of permissible fluctuations of 1fcc. M increased by some fraction of the interval (VI - Id), where h - the value of the upper limit of the interval, equal to t. I., Became equal to HQ-vdCn -MoX, you need the coefficient 4) I1shent gain increased in ISJidOljllb), i.e. increase power supply amplifier with the number of cascades P1 at times. W /, / H vd () To change the luminance of the glow of the upper limit of the screen to the same fraction of the interval d, i.e., to the value of I -b (I -, - Id), the gain must be reduced by nW times, t, e Reduce the voltage of the power amplifier with the number of cascades | n in the upper-C - times. In order to preserve the focusing of electrons in the case of amplifiers with an electromagnetic system of focusing, the magnitude of the magnetic field is also changed so many times. Moreover, due to the potential for the phase of the magnetic field to lag behind the phase of the electric field when the magnetic field changes rapidly, Turn off the power supply and the monitor system 1 of the screen. The method allows to maintain the luminosity of the output screen of the amplifier within the specified limits and to adjust the brightness at the output of the amplifiers, have an electromagnetic focusing system with preservation of the resolution of the fxx rasreshen amplifier, image clarity and the size of the effective area of the output screen. The device works as follows. The converter 6 code-analog converts the voltage of the power source 7 to the analog signal corresponding to the code set at the outputs of counter 4, and supplies it to the image intensifier 8. At that, the electro-optical converter 8 works and creates an image on the input screen, 5 which is proportional to the object brightness observation, and the output of the sensor 1 luminance appears signal corresponding to the integral luminance of the image. When the signal from the brightness sensor 1 changes from the bottom to the value corresponding to the sensor trigger of the upper 2 image brightness level, or from above to the trigger of the lower luminance sensor 3, the sensors change the code value at the output of the counter 4 by -1 or -fl, respectively. which leads to a decrease or increase in the analog signal at the output of the converter cuffer 6, the code-analogue supplied to the image intensifier 8, as a result of which the gain factor of the converter 8 is changed on the image brightness on the screen It is up to the values located between the values of the sensors of the upper 2 and the third levels of image brightness. Thus, the image brightness of the converter is maintained within the specified limits. The initial position of the parallel output of the converter b code-analogue is set by the initial code setting device 5. Necessary changes . The voltage applied to the converter 8 when switching the switch is determined by the law of functional correspondence between the code signals of the counter 4 and the analog signals of the converter 6 - the code is analog. In this way, the voltage change mode is set at .por.shtochen. The invention method of adjusting the brightness of images of objects on the screen of the amplifier 57 of the image, which consists in converting the screen luminosity 5 into an electrical signal and changing the voltage of the image intensifier, which is caused by the fact that, in order to improve the quality of izfazheniya objects, they form the maximum and minimum values of the electric signal with its maximum and minimum value, and at the moments of their equality, the first and second 6 control signals, each of which jumply from responsibly reduce or increase the supply voltage of the amplifier image by an amount providing a predetermined resolution image intensifier. Sources of information taken into account in examination 1, the Federal Patent of Germany No. 1957481, cl. 21 G-29/40, 1972, (prototype).