Systems for in-process inspection of CRT (TV picture tubes)
components |
Misalignment control systems |
Application domain
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. |
Perfomance specification
|
screen-mask spacing control systems |
Application domain
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. |
Performance specification
|
Control error, um
|
±50
|
|
Control range,mm
|
±1
|
|
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 |
 Application
domain
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;
2. illuminators;
3. micro-lenses;
4. analyser;
5. drive. |
Performance specification
|
Distance control range,mm
|
5
|
|
Control error, um
|
±1
|
|
Time of full distance measurement cycle, s
|
1
|
|
|
|
Upgrading of machines for mounting EOS
(similar to RSA or Á1002.15-84)
|
|
Following the upgrading with the RF610Ê 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.
|
Performance specification
|
Full mounting cycle, s, c
|
36 |
|
Accuracy of cathode mounting compared to design values, um
|
±1
|
|
Overall accuracy of assembly mounting, um
|
±5
|
|
|
|
|
All systems feature self-calibration and self-testing modes,
detection of object in the position of control, digital readout
or light signal indication of measurement results, acceptance
control, sorting, data storage and transmission to PC, and networking capability. |
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