JPS6332829A - Regulating device for color television - Google Patents

Abstract

PURPOSE:To perform exact position alignment without artificial correction, by automatically measuring the deflection amount of electron beams of a cathode-ray tube by means of a video signal outputted from a photographing camera and by displaying it so as to make the photographing camera properly face the display screen of a CTV cathode-ray tube which is an object for inspection. CONSTITUTION:An image on a display screen of a cathode-ray tube in a color television (CTV) 11a photographed by an industrial television (ITV) camera 1 is converted into a digital signal and written in an image memory 7. A CPU 10 measures brightness on a specific position of the image screen written in the image memory 7, computes the direction and size of a positional shift of the ITV camera 1 properly facing the cathode-ray tube of the CTV 11a by using the measured value of this brightness and a reference value of brightness distribution every type of the CTV cathode-ray tube, which is memorized beforehand in a memory 10a connected with the CPU 10, and then sends a correction command signal to a position-correcting mechanism 5. The position correction of the ITV camera 1 is performed by controlling regulation boards 2, 3, and 4 in the position-correcting mechanism 5 so that the display screen of the cathode-ray tube in the CTV 11a comes on the prescribed position within the photographing range of the ITV camera 1.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to color television (hereinafter referred to as CTV).
The present invention relates to a CTV adjustment device installed in an inspection line that performs various inspections and adjustments of cathode ray tubes.

[Prior Art] Generally, a CTV color picture tube emits electron beams of R (red), G (green), and B () as shown in FIG.
3 types of electron guns 2 for blue)! and about 10ff just before the fluorescent screen.
It is installed parallel to the fluorescent screen at a position of about iI11, and the R-C
A shadow mask 22 for applying the three types of electron beams -H only to the corresponding fluorescent points, and point-shaped phosphors that emit light in each color of R, G, and B, as shown in the enlarged view of FIG. 11(b). is 9
0 to 1 million fluorescent screens arranged in regular order 23
It consists of. Further, as shown in a side sectional view of the color picture tube in FIG. 12, a purity magnet 25, a deflection coil 26, etc. are provided in the neck portion 24 of the color picture tube.

As is well known, this utility magnet 25 is composed of a set of two annular magnets, and by applying a magnetic field to the electron beam passing through the magnet, the trajectory of the electron beam can be arbitrarily set. can be modified by any amount in the direction of . In addition, the deflection coil 26 generates a magnetic field,
This magnetic field greatly bends the electron beam emitted from the electron gun 21, causing the electron beam to spread over the entire surface of the phosphor screen 23 to form an image.

In the above color picture tube, it is important to accurately irradiate each fluorescent point with the electron beam in order to ensure color purity, and if the electron beam deviates from the fluorescent point that should be irradiated, This is called a mislanding, and when this happens, color mixing occurs and the image becomes difficult to see.

Conventionally, in the above-mentioned electron beam deviation correction work, the CTV cathode ray tube to be inspected is placed on a conveyor line, the conveyor line is driven, and the CTV cathode ray tube is transferred.
When the cathode ray tubes that are being sequentially transferred reach a predetermined position corresponding to the inspection/adjustment device, the transfer is stopped, and then
A skilled worker uses a microscope (50 to 100x magnification) to visually measure whether or not the center of the electron beam and the center of the fluorescent dot are exactly aligned, and the shadow projected by the electron beam on the phosphor is measured. Adjustments were made by empirically estimating the amount of deflection of the electron beam based on the edge shape of the mask.

[Problems to be Solved by the Invention] In the above-mentioned electron beam deviation correction work, the CTV cathode ray tube to be inspected is first transferred by a transfer device such as a belt conveyor, and stopped at a predetermined position facing an inspection adjustment device. However, the stopping position is not accurate enough, and for example, accurate positioning is not possible due to the position of the CRT and the transfer pallet on which the CRT is placed, play in the transfer device, inertia, etc. Therefore, it was actually necessary to manually correct it after the transfer device was stopped.

In addition, when correcting electron beam deviation using conventional methods, ■ there is a large influence due to variations in the edge shape of the shadow mask; ■ measurement results cannot be determined by the operator who performs the measurement because the measurement method is not quantitative. There have been problems in that there are large individual differences in measurement, and ■ In order to perform accurate measurements, operators are required to have a high degree of skill, resulting in large levels of worker fatigue.

[Object of the Invention] An object of the present invention is to solve the above-mentioned problems, and to correct the deviation of the electron beam of a CTV cathode ray tube by directly facing the display surface of the CTV cathode ray tube to be inspected by a photographing camera, and outputting the output from the photographing camera. CT that can automatically measure and display the amount of deflection of the electron beam of the cathode ray tube from the video signal
An object of the present invention is to provide a V adjusting device.

[Structure of the Invention] The present invention includes a photographing camera that photographs the display surface of a cathode ray tube of a color television to be inspected and outputs a video signal; a moving means for moving the position of the photographing camera so that it can take a photograph; a deflection means for selectively deflecting the electron beam of the cathode ray tube in opposite directions; and a deflection means for selectively deflecting the electron beam of the cathode ray tube in opposite directions, color density measuring means for measuring the density of each color from the video signal; calculation means for calculating the amount of deflection of the electron beam from a predetermined fluorescent point of the cathode ray tube from the density of each color; and display means for displaying the amount of deflection. It is characterized by being equipped.

The CTV adjustment device described above measures the amount of deflection of the electron beam, and the adjuster can adjust the CTV's purity magnet and deflection coil based on the deflection amount to correct the deviation of the CTV's electron beam. can.

[Embodiment] FIG. 1 is a perspective view showing a cTV adjusting device which is an embodiment of the present invention and is equipped with a CTV cathode ray tube automatic position correction device and a CTV cathode ray tube electron beam deflection amount measuring device.

In FIG. 1, lla and flb are the CTVs to be inspected.
The CTVs 1a and 1lb are placed on each pallet 12 of an intermittent transfer device 13 that is installed in the CTV adjustment and inspection line and that intermittently transfers the CTVs 11a and Ilb. The CTV I Ia placed on the pallet 12 is sent in the transfer direction of the arrow P by the intermittent transfer device 13, and after reaching a predetermined position where an adjustment device is provided, it is automatically stopped by a predetermined known method, which will be described in detail later. It faces the position correction mechanism 5.

I5 is a main controller that controls the position correction mechanism 5, and the main controller 15 controls the position correction mechanism 5, IT
A monitor television 16 that displays images shot by the V camera l
, and the operation box 18, and when the operator turns on the start switch of the operation box 18, the position correction mechanism 5 is started and the IT provided in the position correction mechanism 5 is connected.
CTV to be inspected within the shooting range of V camera l la
The adjustment tables 2.3 and 4 of the position correction mechanism 5 are operated and adjusted so that the cathode ray tube surface is inserted. 16 is ITV camera,
ITV camera 1h is connected to 1h, and 17 is a monitor TV that displays images to be shot. 17 is C, where various adjustment results are displayed.
It is an RT display, and 34 is a CTV which will be described in detail later.
This is a CRT display on which measurement calculation results regarding the amount of deflection of the electron beam 11a are displayed.

FIG. 2 is a block diagram of the CTV cathode ray tube automatic position correction device shown in FIG. 1. In FIG. The CTV IIa is moved at a constant speed in the direction of the arrow P, and the CTV IIa faces the position correction mechanism 5.
When reaching a predetermined inspection position where an adjustment device is provided, the movement of the pallet is stopped for a certain period of time. Position correction mechanism 5
is provided on the side of the intermittent transfer device 13 at a position facing the display surface of the cathode ray tube of the CTV la placed on the stopped pallet 12, and is equipped with a central processing circuit (hereinafter referred to as It is called CPU.

) 10 in the X-X direction, Y
- Adjustment table 2 movable in Y direction and Z-X direction respectively
．． 3 and 4. Here, the X-X direction is a horizontal direction parallel to the moving direction of the pallet 12, and the Y-Y
The direction is perpendicular to the horizontal plane and perpendicular to the X-X direction, and the Z-X direction is perpendicular to the X-X direction and the Y-Y direction. In addition, in the position correction mechanism 5, an ITV camera l is installed on the side of the adjusting table 3 in the Y-Y direction of the mechanism 5 facing the CTV lla's cathode ray tube so that the display surface of the cathode ray tube is included in the camera's shooting w1@. It will be done. The image captured by the ITV camera 1 on the display surface of the cathode ray tube of the CTV 1a is converted into an analog image signal, and this analog image signal is sent to the A/D in the main controller 15.
It is output to converter 6. The A/D converter 6 converts the input analog video signal into a digital signal and writes it into the image memory 7.

CPU10 is connected to this image memory 7, and CPU10 is connected to this image memory 7.
0 measures the brightness at a specific position on the image plane written in the image memory 7, and combines this measured brightness value with the CPU l
ITV camera! The direction and magnitude of the deviation from the position where the CTV Ila should face the cathode ray tube are calculated, a correction command signal is sent to the position correction mechanism 5, and the CTV Ila's cathode ray tube is moved to a predetermined position within the photographing range of the ITV camera l. The position of the ITV camera 1 is corrected by controlling the adjustment tables 2, 3 and 4 of the position correction mechanism 5 so that the display surface of the ITV camera 1 is adjusted.

In this way, when the position of the ITV camera 1 is inappropriate with respect to the stop position of the CTV 11a and Ilb, the position of the ITV camera 1 is corrected by the adjustment tables 2.3 and 4 of the position correction mechanism 5. CTVl 1a and llb
and is corrected to the above-mentioned predetermined position state directly facing the ITV camera l.

FIG. 3 is a front view showing the display screen 8 of the screen that monitors the contents of the image memory 7. In FIG.
An image 9 showing the display surface of the cathode ray tube of TVl 1a is located within the display surface 8. On the display surface 8, the area inside the image 9 has high brightness, while the area outside the image 9 has low brightness. It has become. Therefore, the brightness distribution characteristic measured by the CPU10 along the x'-x' line horizontally crossing the substantially central position of the display surface 8 is as shown in FIG.

In FIG. 3, a is the distance between the leftmost vertical line of the display surface 8 of the screen that monitors the contents of the image memory 7 and the leftmost horizontal line of the image 9, and b is the distance between the rightmost vertical line of the display surface 8 and the image 9. is the distance from the rightmost vertical line. Also, C
is the distance between the upper horizontal line of the display surface 8 and the upper horizontal line of the image 9, and d is the distance between the lower horizontal line of the display surface 8 and the lower horizontal line of the image 9.

As mentioned above, the image 9 corresponds to the display surface of the CTV cathode ray tube, and whether or not the display surface 8 and the image 9 are in the correct position is measured in units of pixels. . That is, the CPU10 measures the values of a, b, c, and d in the image memory 7, and when a=b and c=d, the photographing range of the ITV camera 1 is CTV1.
This means that it is at a predetermined position directly facing the display surface of the cathode ray tube 1a.

Therefore, at this time, the CPU10 does not output a correction command signal, and the position correction mechanism 5 is in a stationary state.

On the other hand, when af-b or cf-d, the CPU 10 outputs a correction command signal to the position correction mechanism 5 such that a=b or c=d, and in response, the position correction mechanism 5 Adjustment tables 2, 3 and 4 are controlled so that c=d. Here, as long as the CTV model and the size of the cathode ray tube do not change, the height at which the CTV is supported is constant in any case, so check the vertically opposing positional relationship between the ITV camera l and the cathode ray tube of the CTV 11a. If adjusted before, the positional relationship can be kept unchanged, and therefore,
c=d. The following description will be made assuming that c=d can be kept unchanged.

Next, as shown in FIG. 5, if the image 9 input to the image memory 7 is shifted to the left with respect to the display surface 8 by the value of g, the brightness on the center line x' - x' of the display surface 8 When measured by the CPU10 as described above, a luminance distribution corresponding to the deviation between the display surface 8 and the image 9 as shown in FIG. 6 can be obtained. CPU10 connects the rightmost vertical line of image 9 and display surface 8
As soon as the deviation value g, which is the distance from the appropriate line, is measured, calculation of the correction amount is started to correct the condition shown in FIG. 3, where a=b and c=d. The proper line of the display surface 8 is a vertical line that is at a distance b from the vertical line at the right end of the display surface 8 and is parallel to the vertical line.

Here, ff1 (hereinafter referred to as movement correction amount) for moving the ITV camera in the x'-x' axis direction is G, and the CTV
If the vertical dimension of the cathode ray tube image screen is E, the value of the deviation in the x'-x' axis direction between the display surface 8 of the image memory 7 and the image 9 is g1, and the vertical dimension of the image 9 is e. , E:G=e:g Kōsha Ken ・
(1), and from equation (1), the movement correction ff1G is G=
(E/e)・g...(2). Therefore, after the CPU10 measures the deviation value g and calculates the movement correction ff1G by calculating the equation 2), a=b shown in FIG.
Move correction in the Xo-X′ axis direction so that
A correction command signal for moving by 1G is output to the position correction mechanism 5. In response to this, the position correction mechanism 5 moves the XX adjustment table 2 in the XX axis direction and in the opposite direction to the arrow P by a movement correction amount G to correct the position of the ITV camera 1.

FIG. 7 shows a case where the position of the image 9 on the image memory 7 is shifted by the value r to the right in the opposite direction from that in FIG. 5 with respect to the display surface 8 of the image memory 7. The luminance distribution along the x'-x' line, which is the approximately central horizontal line of the display surface 8, is as shown in FIG. In this case, the value of g in the correction calculation formula (2) is replaced with r to calculate the movement correction amount G, and the correction direction is reversed and a correction command signal is sent from the CPU10 to the position correction mechanism 5. The position of camera l can be corrected accurately.

Next, a CTV electron beam deflection measuring device will be described with reference to the drawings.

FIG. 9 shows a configuration explanatory diagram of an embodiment of a CTV electron beam deflection amount measuring device according to the present invention. In Figure 9, 27
is an NTSC pattern generator, and a green monochromatic image signal is created by the pattern generator 27 and CT
The signal is output to the CTV cathode ray tube 29 in Vl 1c. As a result, the electron beam emitted from the electron gun 21 of the CTV cathode ray tube 29 is irradiated onto the display phosphor screen 29a of the c'rv cathode ray tube 29, and a green monochromatic image is displayed on the display section 29a of the CTV cathode ray tube 29.

35 is a measurement deflection coil;
is the neck portion 24 of the cathode ray tube 29 of the CTVllc, in which the electron beam output from the electron gun 21 is placed between the utility magnet 25 and the deflection coil 26, and is displayed on the cathode ray tube by applying a predetermined DC voltage E to the deflection coil 35. It is attached using fixing screws (not shown) so as to be deflected horizontally to the left and right on the phosphor screen 29a.

One end of this deflection coil 35 is connected to the common side of a switch 70, and the a side of the switch 70 is connected to the positive terminal of a DC i source 7I of a predetermined DC voltage E.
The negative pole of I is connected to the other end of the deflection coil 35. The b side of the switch 70 is connected to ground, the a side of the switch 70 is connected to the negative pole of a DC power supply 72 with a predetermined DC voltage E,
The positive pole of the DC power supply 72 is connected to the other end of the deflection coil 35. Note that the switch 70 is controlled by the CPU 62 of the image processing device 33, which will be described in detail later.

Here, when the switch 70 is on the b side, no voltage is applied to the deflection coil 35, and the electron beam emitted from the electron gun 21 is not deflected. Further, when the switch 70 is switched to the a side, the DC voltage E is applied to the deflection coil 35, and the magnetic field generated by the deflection coil 35 causes the electron gun 2! The electron beam emitted from the CTV cathode ray tube 29
is deflected in the left horizontal direction on the display phosphor screen 29a.

Further, when the switch 70 is switched to the a side, a DC voltage E is applied to the deflection coil 35 in the opposite direction compared to when the switch 70 is switched to the a side, and the magnetic field generated by the deflection coil 35 is As a result, the electron beam emitted from the electron gun 21 is deflected in the right horizontal direction on the display phosphor screen 29a of the CTV cathode ray tube 29.

In the CTVl lc shown in FIG.
9a, there are three measurement points 51.5 in the vertical direction along the left edge near the left edge of the display phosphor screen 29a.
2 and 53 are set at predetermined equal intervals from each other, and on the other hand, three measurement points 54, 55 and 56 are set at predetermined equal intervals from each other in the vertical direction near the right end of the display phosphor screen 29a and along the right end. Set. Here, measurement points 52 and 55
are set at approximately midpoint positions near the left and right ends of the display phosphor screen 29a. Furthermore, three measurement points 57, 58 and 59 are provided horizontally between the measurement points 52 and 55 on the display phosphor screen 29a at predetermined equal intervals. In FIG. 9, for convenience, the measurement area is shown for the measurement points 51 to 59 as large squares, but the actual measurement points are CTV
This is a fluorescent black area of a predetermined area on the display fluorescent screen 29a of the cathode ray tube 29.

The image on the display phosphor screen 29a of the CTV cathode ray tube 29 is
The image is photographed by the ITV camera l provided in the position correction mechanism 5 through a green transmission filter 30 attached to the front surface of the photographing lens of the TTV camera l. Here, the green transmission filter 30 is a filter that allows only green light to pass through. The image signal obtained by the TV camera 1 is sent to the camera controller unit 32, converted into a predetermined video signal, and then written to the image memory 61 in the image processing device 33 as grayscale data.

This image memory 61 is connected to the CPU 62 of the image processing device 33, and the CPU 62 switches the switch 70 to store image memories at positions corresponding to the nine measurement points 51 to 59 of the CTV cathode ray tube 29 in the above deflection state of each electron beam. Based on the concentration value of the memory address 61, calculations to be described in detail later are performed to determine the deflection direction and amount of deflection of the electron beam from a predetermined fluorescent point at each measurement point 51 to 59, and the calculation results are stored in the memory 63. At the same time,
CP to display the above calculation result on the display 34.
It is output to the display 34 via the display control unit 64 connected to U62. Note that the memory 63 stores the above calculation results of the CPU 62 and a system program for controlling the CPU 62.

Furthermore, the principle of measuring the deflection amount of the electron beam described above in FIG. 9 will be explained in detail with reference to FIG. 10. 1st
In FIG. 0, the connection between the switch 7Q and the 271 side and one end of the deflection coil 35 is cut, and the ammeter 75 is inserted between them. A, B, and C in Fig. 1O indicate the ammeter 7 when the switch 70 is switched to the a side, the b side, and the C side, respectively.
5, and A', B' and B' of Fig. 1O.
are the display phosphor screen 29a of the CTV cathode ray tube 29 when the switch 70 is switched to the a side, b side, and C side, respectively.
Bright spots 37 of green G at each measurement point 51 to 59 above
FIG. 3 is a diagram showing the positional relationship between G and guard punts 36a to 36d. As shown in FIG. 10, since a green monochromatic image signal is supplied from the pattern generator 27, only the green fluorescent dots light up. Note that these figures show the case where the center of the electron beam output from the electron gun 21 coincides with the center of the fluorescent spot on the display fluorescent screen 29. 1st O
In the figure, the guard bands 36a to 36d are band-shaped, and as is known in the art, the guard bands 36a to 36d are band-shaped.
The longitudinal direction of the display phosphor screen 29a is angled vertically.

In the measurement shown in FIG. 1O, when the switch 70 is switched to side b, no current flows through the deflection coil 35 as shown in B of FIG. The electron beam is irradiated onto a predetermined fluorescent point on the display fluorescent screen 29a of the cathode ray tube 29, and at this time, as shown in B' in FIG. arise.

Next, when the switch 70 is switched to the a side, the first
As shown at A in Figure O, a predetermined negative current flows through the deflection coil 35, and the magnetic field generated by the deflection coil 35 deflects the electron beam to the left from a predetermined fluorescent point on the display fluorescent screen 29a of the cathode ray tube 29. be done. At this time, the first
As shown at A' in Figure 1O, the substantially central portion of the bright spot 37G is shifted toward the girt band 36b compared to B' in Figure 1O, and overlaps with the girt band 36b.

Furthermore, when the switch 70 is switched to the C side, a predetermined positive current flows through the deflection coil 35 as shown in C in FIG. Fluorescent screen 29a
It is deflected to the right from a predetermined fluorescent point above. At this time, as shown at B' in FIG. 1O, the approximate center of the bright spot 37G is shifted toward the guard band 36c compared to B' in FIG.
It will overlap with the guard band 36c.

Here, at the time of B in FIG. Each density value of the image data at the address is set to Ln++ to Lm, respectively.
It is stored in the memory 63. Next, at A in FIG. 10, that is, when the switch 70 is switched to the a side and a predetermined negative current -K flows through the deflection coil 35, CI'U
62 is an image memory 6 corresponding to each measurement point 51 to 59;
Each density value of the image data at address 1 is stored as L+)+ to Lp in the memory 63.Furthermore, at C in FIG. 10, that is, the switch 70 is set to C.
When the deflection coil 35 is switched to the side, a predetermined positive current of 10 K is applied to the deflection coil 35.
, the CPU 62 stores each density value of the image data at the address of the image memory 61 corresponding to each measurement point 51 to 59 as Lnl to L'ns, respectively, in the memory 631 a2.

At each of the measurement points 51 to 59 described above, if the center of each electron beam spot and the center of the fluorescent point on the display fluorescent screen 29a of the c'rv cathode ray tube 29 match, Lpi/l, @1= Lni/Lmi.

i=1.2. ..., 9... (3), and if the center of each electron beam spot is shifted to the left or right from the center of the fluorescent point, Lpi/L+ni>Lni, respectively.
/Lii.

i=1.2. ..., 9... (4) L pi/
Lll1i<Lni/Lmi.

i=1, 2. ..., 9... (5). At this time, the amount of deviation between the center of the electron beam spot and the center of the fluorescent point, that is, the amount of deflection, is as follows: ΔL=Lpi/Lmi−Lni/Lmi.

i=1, 2. ..., 9... (6).

Therefore, the CPU 62 executes the calculation of equation (6) based on the value stored in the memory 63 and displays the calculation result on the display 34 via the display control section 64. Based on the displayed deflection amounts at each of the measurement points 5I to 59, the adjuster makes predetermined adjustments to the purity, magnet 25, and deflection coil 2G.

The operating method and operation of the c Tv n adjustment device according to the present invention configured as above will be explained.

First, when the CTVlla to be inspected is placed at a predetermined position on the pallet 12 of the intermittent transfer device 13, the CTVlla
a is sent in the direction of arrow P by the intermittent transfer bag g113, and is automatically stopped after reaching a predetermined position where it faces the position correction mechanism 5 and where the adjustment device is provided. Next, the adjuster
A measuring deflection coil J5 is attached between the purity magnet 25 and the deflection coil 26 in the neck portion 24 of the cathode ray tube 29 of lla using a fixing screw (not shown). Furthermore, when the adjuster turns on the start switch of the operation box 18, the cputo built in the main controller I5 is activated, and the image taken by the ITV camera I is stored in the image memory 7 via the A/D converter and the bartaro. be done. The CPU performs the above-mentioned predetermined calculation based on the image information stored in the image memory 7, outputs the correction command signal to the position correction mechanism 5, and operates the x-xi alignment table 2 of the position correction mechanism s. , the display phosphor screen 29a of the cathode ray tube 29 of the CTVlla and the photographing lens of the ITV camera 1 are made to directly face each other. CTVlla at this time
It can be confirmed on the monitor television 16 whether the surface of the cathode ray tube 29 is correctly within the field of view of the ITV camera l.

Next, when the adjuster turns on the measurement start switch of the operation box 18, the CTVlla's cathode ray tube 2
9, the amount of deflection of the electron beam is measured, and the display 34
The amount of deflection of the electron beam at the nine measuring points 51 to 59 set in advance is displayed in a number corresponding to the measuring points. The adjuster checks whether the data displayed on the display 34 is adjusted within a preset tolerance range. At this time, if the displayed data is not within the above tolerance range, the purity magnet 25 and the deflection coil 2
After making the predetermined adjustment for 6, the amount of deflection of the electron beam is measured again, and it is confirmed that the displayed data is within the above-mentioned allowable range.

When the displayed data falls within the above-mentioned allowable range, the measurement deflection coil 26 is connected to the cathode ray tube 29 of the CTV I la.
By turning on the adjustment completion switch of the operation box 18, the CTV 11a is ejected from the predetermined adjustment position in the direction of arrow P, and a new CTV to be inspected is placed next.
TVllb is transferred by the intermittent transfer device 13.

In the above embodiment, nine measurement points for the deflection of the electron beam on the display phosphor screen 29a of the CTV 29 are provided as shown in FIGS. 9 and 10.
The present invention is not limited to this, and any number of measurement points may be set at any location on the display phosphor screen 29a.

In addition, in the above embodiment, the amount of deflection of the electron beam in the horizontal direction on the display phosphor screen 29a is measured, but instead of the measurement deflection coil 35, a deflection means having two sets of deflection coils is used to It is also possible to perform two-dimensional deflection of the electron beam, measure the direction and amount of deflection of the electron beam on the display phosphor screen 29a of the cathode ray tube 29, and display it on the display 34.

As described above, the CTV cathode ray tube automatic position correction device according to the present invention can
When inspecting the cathode ray tube 29 of Ila, the ITV camera l
By moving the photographing direction of the images, the positions can be easily and accurately corrected so that they face each other.

Further, there is no need to accurately position the CTV on the pallet 12, and therefore it is sufficient to simply place the CTV in a predetermined position, making work easier and improving work efficiency. Furthermore, in addition to using ITV camera I for position correction, C
Measurement of the brightness at a predetermined point on the display phosphor screen 29a of the TV's cathode ray tube 29, measurement of patterns, etc., and associated adjustments can be performed immediately while the CTV is stopped and placed.

Other excellent effects include the ability to use the existing conveyor as it is to perform various functional tests without modifying the conveyor mechanism as a transfer device or increasing the stopping accuracy.

Further, since the CTV adjustment device according to the present invention can quantitatively measure the deviation of the electron beam, it is possible to accurately adjust the deviation. Furthermore, since the deviation can be measured more quickly and accurately than in the conventional empirical method by an operator, the time required for adjustment can be significantly shortened.

[Effects of the Invention] As detailed above, according to the present invention, there is provided a moving means for moving the position of the photographing camera so that the photographing camera can photograph the entire display surface of a color television cathode ray tube, and an output from the photographing camera. The camera is equipped with a calculation means for measuring the color density from a video signal and calculating from the color density the amount of deflection of the electron beam from a predetermined fluorescent point, and a display means for displaying the amount of deflection. The device can be directly opposed to the display surface of a color television cathode ray tube, and the amount of deflection of the electron beam of the cathode ray tube can be automatically measured and displayed from the video signal output from the camera. Therefore, there is an advantage that the corrector can quickly and accurately correct the deviation of the electron beam of the color television based on the amount of deflection of the electron beam.

Furthermore, based on the image information obtained by the photographing camera, both the positioning of the photographing camera itself and the inspection of the purity shift can be performed, and an efficient system can be constructed. Furthermore, automatic measurement can be achieved by automating manual operations.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a color television adjustment device that is an embodiment of the present invention, Fig. 2 is a perspective view of the automatic position correction device shown in Fig. 1, and Fig. 3 is a perspective view of the automatic position correction device shown in Fig. 1. il! showing an example of proper placement of images! Figure 4 is a front view of the monitor display surface of the image memory, x'-x of the monitor display surface of the image memory in Figure 3.
Figure 5 is a front view of the display surface of the image memory with the image captured by the ITV camera in Figure 1 shifted to the left; Figure 6 is a diagram of the display surface of the image memory in Figure 5. A brightness distribution diagram along the x'-x'line; Figure 7 is a front view of the display screen of the image memory with the image captured by the ITV camera in Figure 1 shifted to the right; Figure 8 is a diagram of Figure 7. 9 is a block diagram and perspective view of a device for measuring the amount of electron beam deflection of a cathode ray tube of a color television, and FIG.
A perspective view of a cathode ray tube, a front view of an ammeter, and a front view of a display phosphor screen of a cathode ray tube, showing the principle of measuring the amount of deflection of an electron beam by the device shown in the figure. FIG. 11(b) is an enlarged front view of the display phosphor screen of the cathode ray tube shown in FIG. 11(a), and FIG. 12 is a side sectional view of the cathode ray tube shown in FIG. 11(a). ! ...ITV camera, 2,3.4...Adjustment stand, 5.
...Position correction mechanism, 6...A/D converter, 7...
・Image memory, IO...Central processing circuit (CPU)
), 10 a-memory, 11a, 1 lb, I Ic
・-Color television (CTV), l 2...Pallet, 13...Intermittent transfer device, 15...Main controller, 16...Monitor TV, 17...CRT
Display, 18... Operation box, 21... Electron gun, 24... Neck of cathode ray tube, 25... Purity magnet, 26... Deflection coil, 27...
・NTSC pattern generator, 29...Color television cathode ray tube, 30...Green transmission filter, 3
2... Camera control unit, 33... Image processing device, 34... CRT display, 35...
Measurement deflection coil, 36a. 36b, 36c, 3 (3d-Gartband, 37rt
-... Red bright spot, 37G... Green bright spot, 37B.
...Blue bright spots, 51-59...Measurement points, 61...
Image memory, 62...Central processing circuit (CPU)
, 63... Memory, 64... Display control unit, 70...
・Switch, 71.72...DC power supply. Patent Applicant Sharp Co., Ltd. Agent Patent Attorney 2 people including Aohaku Ao, Figure 2, Figure 3, WE4 section □0 Figure 5 -------, --------255 □0 Figure 7 Evening 11 Figure (a) 111 I! ! (b)
Volume 12

Claims (1)

[Claims] (1) A photographing camera that photographs the display surface of the cathode ray tube of the color television to be inspected and outputs a video signal, and a camera capable of photographing the entire display surface in response to information of the video signal; a moving means for moving the position of the camera; a deflection means for selectively deflecting the electron beams of the cathode ray tube in opposite directions; A color density measuring means for measuring the color density from a predetermined fluorescent point of the cathode ray tube, a calculation means for calculating the amount of deflection of the electron beam from a predetermined fluorescent point of the cathode ray tube from each of the color densities, and a display means for displaying the amount of deflection. Color television adjustment device.