Systems for in-process inspection of CRT (TV picture tubes) components
Misalignment control systems
The systems are designed for in-process detection of axis misalignment and non-perpendicularity of CRT funnel neck. They consist of two RF200 Series raster-type transducers (when checking is effected by the funnel outer surface) or two RF600 Series laser triangulation sensors (for non-contact checking by the funnel inner surface), a rotation angle sensor and a three-co-ordinate RF300 Series numeric display. The systems enable measurement of runout of cylindrical surface rotating about the basic axis in two planes, recording of runout values in three angular sections, and computation of axis misalignment and non-perpendicularity parameters.
|Parameter control error, um
Screen-mask spacing control systems
The systems are designed for non-contact gauging of the screen-mask spacing without any component disassembly. They consist of five or nine dual RF600 Series sensors located at gauge points of the screen-mask assembly, a microprocessor system for measurement data pre-processing, and PC software package. The screen-mask spacing is calculated from the distances measured to the outer and inner surface of the screen and to the mask.
|Control error, um
Multi-channel systems for control of form and spacing
8-channel systems designed for measuring the Z-point – TV tube ‘ear’ distance consist of 8 RF200 Series sensors located at gauge points on the tube and an 8-coordinate RF300 Series numeric display.
64 – channel systems intended for inspection of the form of the tube screen inner surface consist of 64 RF200 Series sensors located at gauge points on the screen, a numeric display and a PC. The systems perform calculation of the screen sphere parameters and compare them with the standard sphere parameters
Sensors for control of electron-optic systems (EOS) mounting
The sensors are designed for non-contact checking of the ‘accelerating electrode - cathode’ and ‘accelerating electrode - modulator’ distance in the process of assembly based on the confocal microscopy method which consists in formation of a mask on the object surface and determination of the distance to that surface from the value of the image contrast.
1. guides for EOS mounting;
|Distance control range,mm
|Control error, um
|Time of full distance measurement cycle, s
Upgrading of machines for mounting EOS (similar to RSA or Б1002.15-84)
Following the upgrading with the RF610К sensor the machine performs the following operations in automatic cycle:
measurement of the "accelerating electrode-modulator" distance;
optimisation of the cathode-modulator assembly geometry (separately for each cathode);
mounting of assembly (press-fit of cathodes);
measurement of the "accelerating electrode-modulator "distance (modulator-cathode) following mounting;
storing of measurement data into the data-base.
|Full mounting cycle, s, c
|Accuracy of cathode mounting compared to design values, um
|Overall accuracy of assembly mounting, um