SU699316A1 - Method of determining transverse oscillations of moving record carrier at recording - Google Patents

Claims (2)

writing gryvki, which can not be given by this method. to determine. The purpose of the invention is to improve the accuracy of determining the lateral vibrations of the carrier during recording. This is achieved by the method of determining the transverse oscillations of a moving information carrier during recording, scan the carrier with a beam of a cathode ray tube (CRT) of the carrier during recording, measure the time of scanning the beam across a fixed information carrier, then during movement of the carrier after recording the control electrostatic signal in the form of two straight-lines, the scan time of the EJ beam across the moving information carrier, the scan time of the beam from the edge of the carrier to the control signal, and the scan time Neither the beam between the control signals and the magnitudes of oscillations perpendicular to the carrier plane and in the carrier plane are determined, respectively, according to the formula - / 7 I. - 2 2 -С Where Ud is the E.PT beam scanning speed; T is the scan time of a CRT beam across a fixed carrier; T is the scan time of a CRT beam across a moving carrier; - scan time of a CRT beam from the edge of the carrier to the control signal; 7, is the scan time of a CRT beam between control signals. FIG. 1 is a diagram implementing the proposed method; in fig. 2 - time diagrams. The cathode ray tubes of EJ1 and ELT2 with metal fiber screens are installed perpendicular to counter electrodes 3 and 4 and a moving electrostatic tape carrier 5, on which the control signal is recorded in the form of a straight line using EJ1. The outputs of the sawtooth voltage generator 6 are connected to the deflecting system ELT2 and to the generator 7 of a constant voltage. The outputs of the latter are connected to the cathodes ELT1 and ELG2. A constant-voltage generator 8 is connected to a CRT1 deflection system. The counter-electrode 4 grounded through the resistor 9 is connected via amplifier 10 to the input of a pulse selector 11, three outputs of which are connected to the input of an electronic computational interface (COMPUTER) 13 through converters PWM-KIM 13. The recording transverse oscillations of the moving information carrier are written as follows . When the carrier tape 5 is stationary, the beam is scanned to the ELG2 screen by applying to the deflecting system of the ELT2 a voltage sweep from the generator 6 output and to a constant voltage cathode from the generator 7. When the electron beam from the EF2 to the counter electrode 4 passes through the latter and the resistor 9 flows current, on the resistor 9 is formed zero voltage level. When a CRT2 beam hits a carrier, a counter electrode 4 and a resistor 9 flow a current smaller in magnitude than in the first case, which creates a level of voltage AI at resistor 9. After the CRT2 beam passes through the entire width of the carrier, the beam again goes directly to the counter-electrode 4, causing a zero voltage level. Thus, when scanning the ELT2 beam on a resistor, a pulse of duration T and voltage level Аi was formed (see Fig. 2a). This pulse, passed through amplifier 10 and selector 11, is converted into code in one of converters 12 and entered into computer memory 13. Then the carrier 5 is set in motion. The CRT1 beam is fixed in the middle of the screen by applying a constant voltage level equal to the average amplitude voltage of the oscillator generator 6 to the deflecting system CRT1 from the generator 8. A constant voltage level of the generator 7 gives the beam CRT G to a constant open. The pilot signal is recorded as a straight line. However, in reality, due to transverse oscillations perpendicular to the plane of the carrier when recording the carrier tape, the control signal takes the form of a wavy line iL (see Fig. 1). The width of the wavy line is directly proportional to the vibrations perpendicular to the plane of the carrier, and the position of the center line of this wavy line L is directly proportional to the vibrations of the carrier transverse to the plane of the carrier during recording. The recorded congress signal is read from the moving carrier tape 5 by supplying a sweep signal from the sawtooth generator 6 to the deflecting system E2 and a constant signal level from the generator 7 of the constant voltage to the cathode CRT2. When a CRT2 beam is shown on a counter electrode, a zero potential is formed on the resistor 9, and when a readout is on a carrier, a pulse of amplitude A, is formed. When the beam hits the parts of the control signal, a pulse is generated with amplitude A and duration g-. After the passage of the entire Shchirin by a beam of a beam of 5 liters, the leading edge of the pulse is formed with the amplitude AI and the total duration t (see Fig. 26). After the passage of the generated signal (see Fig. 26) of the amplifier 10, the signal enters the pulse selector 11, where three pulses are formed from this pulse: TI (see Fig. 2c), duration r2 (see Fig. 2d), duration t (see fig.2d. These pulses are fed to the corresponding PWM to kodoimpulnye converters. Codes corresponding to three signals are input to the computer 13. JL computer 13 by the formula a V -T2i t. (where t is 1,2 ... n - the number of points at which oscillations are determined. along the length of the tape carrier), calculates the width of the signal and the string U It is the dependence by which the carrier oscillations perpendicular to the carrier plane are judged, and by formula b, the DCAP calculates the displacement and builds the dependence by which the carrier x 25 is measured, in the carrier plane, with The introduction of the coefficient eliminates the transverse oscillations of the carrier when read at each point. Perpendicular oscillations of the carrier of the carrier when read are not affected by the accuracy of determining the oscillations in the recording. The application of the proposed method makes it possible to measure carrier oscillations transverse and perpendicular to the carrier plane 5 when recording with greater accuracy, and with the separation of information about carrier oscillations in the latter plane and perpendicular to it. Claim 40 A method for determining lateral vibrations of a moving information carrier during recording. which consists in recording and recording (a control signal, according to which changes transverse oscillations of the carrier are judged, only because, in order to improve accuracy, the carrier is scanned by the carrier's electron-beam tube during recording) scanning the beam across a fixed media, then during movement after recording the reference electrostatic signal in the form of two straight lines, the scan time of a CRT beam across a moving media is measured, the scanning time of the beam is about the edges of the carrier to the control signal and the scan time of the beam between the control signals and the magnitudes of the oscillations perpendicular to the carrier plane and in the carrier plane are determined respectively by the formulas .1 (.-iT-Vit :) —Esh Beam Scanning Speed, V. T scan time of a CRT beam across a fixed carrier; -the scan time of an ETP beam; sweep across a moving carrier; -the scanning time of an ETP beam from the i edge of the carrier to the control signal; - during the scanning of the ELG beam between the Tji control signals. Sources of information taken into account in the examination 1. USSR author's certificate number 470205, G 01 B 7/00, 1972. 2. USSR author's certificate No. 442381, G 01 B 7/00, 1973 (prototype).