JPS6154318B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for detecting the amount of misconvergence on a fluorescent surface of an electron beam in a color picture tube.

Conventionally, this type of device has the configuration shown in Figure 1, but when this conventional device is used to test the amount of misconvergence of a three-electron gun in-line arrangement picture tube, it is difficult to There is a drawback that the detected amount of misconvergence varies depending on which color of the phosphor on the phosphor surface the baseline is facing. The apparatus shown in FIG. 1 will be explained below.

In the figure, 1 is a picture tube (hereinafter abbreviated as CPT) of a color television receiver 2 (hereinafter abbreviated as CTV), 3 is a beam spot or bright spot on the CPT fluorescent surface, and 4 is an image The signal input terminal 5 is a color designation signal input terminal. Reference numeral 6 denotes a photoelectric detector consisting of a plurality of photoelectric conversion elements, and as shown in FIG. ,73,7
Electrical output V ₁ proportional to the amount of incident light for every 4,
Sends V ₂ , V ₃ , and V ₄ . In the figure, γ is a resistance and AMP is an amplifier. Reference numeral 8 denotes an optical lens system, through which a bright spot 3 is imaged onto a photoelectric detection surface 7 placed opposite to the CPT tube surface. Reference numeral 9 denotes an arithmetic circuit, which is configured, for example, as shown in Figure 4 (OP is an arithmetic unit), and by switching the color designation signal c, a red bright spot R, a green bright spot G, and a blue bright spot B are displayed in sequence. For example, the base point Q (coordinate origin) of the respective images 31 _R , 31 _G , 31 _B shown in FIG.
Horizontal position and vertical position deviation amount △H (△H
_R , △H _G , △H _B ) and △V (△V _B , △V _G , △
V _B ), the brightness I of the image formation, and the above electric output
The following calculation is performed from V ₁ to _{V 4} and the horizontal and vertical position deviation signals ΔH and ΔV (FIG. 3) are sent out.

△H = (V ₁ + V ₄ ) - (V ₂ + V ₃ ) △V = (V ₁ + V ₂ ) - (V ₃ + V ₄ ) I = (V ₁ + V ₂ + V ₃ + V ₄ ) 10 is video signal generation control The control circuit of the device 11 receives the horizontal and vertical position deviation signals △H, △V and the brightness signal I, and uses the sampling signal S _a (Fig. 3) generated using the brightness signal I to generate a bright spot. 3, the horizontal and vertical position deviation signals △H and △V are held until the next light emission timing, and the horizontal and vertical position correction signals H _P and V are controlled until the absolute values of both signals become zero. Send _P while repeatedly modifying it. Reference numeral 12 denotes a video signal generation circuit of the video signal generation control device 11, which sends a video signal p having the luminance signal a as video information to the video signal input terminal 4, as shown in FIG. Horizontal synchronization signal b of luminance signal a
The position (time) H _b from 1 to 2 is controlled in accordance with the horizontal position correction signal H _P , and the scanning line where the luminance signal a exists is given by the vertical position correction signal V _P .

In the above configuration, by sequentially switching the color designation signal c from the control circuit 10 to designate red, green, and blue, the CPT of the corresponding electron beam is
When a beam spot, that is, a bright spot 3 on the fluorescent surface is imaged on the divided photoelectric detection surface 7 as shown by 31 _R , 31 _G or 31 _B in FIG. 2, these red, green and blue bright spots The position of the bright spot 3 is corrected until the center of the images 31 _R , 31 _G , 31 _B moves onto the detection base point Q. These position correction amounts, ie, misconvergence amounts, are determined by the red, green, and blue position indicators 13 _R and 1 connected to the control circuit 10, respectively.
Displayed on _3G and _13B .

If the color picture tube is a three-electron gun in-line arrangement picture tube, the phosphors may be red, green, red, green, etc.
They are coated on the fluorescent surface in the order of blue in parallel horizontally as shown in FIG. Therefore, when detecting the amount of horizontal misconvergence using the above device, the Y axis of the photoelectric detection surface 7 is aligned with the fluorescent surface 14 as shown in FIG.
A bright spot ₃ (P _x
( _Fig . 5 shows the case where three color phosphors are emitting light at the same time, but in the above detection, each color phosphor is sequentially emitted.) ), the arrangement of the phosphors 16 is defined as described above, and the phosphors 16 are emitted by the corresponding electron beams for each color from the three electron guns arranged in-line laterally, so that the phosphors 16 are arranged on opposite sides of the Y-axis of the photoelectric detection surface 7. When the position is shifted from P _A to P _B by a distance corresponding to the pitch between phosphors 1S, the corrected position of the blue bright spot B is 3S.
This results in a pitch shift. The above Y-axis opposing position is P
When shifted to _C , the corrected positions of the blue and green bright spots are shifted to the left by 3S.

In this way, in the conventional misconvergence amount detection device, the amount of position correction of the bright spot changes depending on whether the Y-axis of the photoelectric detection surface 7 is placed opposite to any of the phosphors 16 on the phosphor surface 14. There are drawbacks. Therefore, during detection, it is necessary to correct the detection result by detecting which color phosphor the Y-axis of the photoelectric detection surface 7 is facing, but this is done by using CPT as in CPT inspection. When it is necessary to replace the phosphor, or when adjusting the CTV, it is difficult to specify the alignment of the phosphor as a result of the adjustment from the perspective of visibility of the phosphor.

Additionally, in order to confirm the phosphors facing each other on the Y-axis, it is possible to slightly move the Y-axis position laterally and detect the color that shows the maximum change in bright spot position correction amount. In addition, the measurement time becomes long, and the movement of the photoelectric detector 6 requires a resolution of 0.1 mm, which makes the configuration of the device complicated and is not practical.

This invention was made in order to eliminate the drawbacks of the conventional device as described above. By specifying a color, the detection coordinates and hence the detection base point for each specified color are displayed on the divided photoelectric detection surface of the photoelectric detector. The misconvergence amount of a three-electron gun in-line picture tube can be detected by arranging them in-line, that is, paralleling each other at a predetermined interval in the horizontal direction, in the same order as the phosphor array in which the detection base points are selected and arranged in the same order as the defined phosphor arrangement order. It is an object of the present invention to provide a suitable misconvergence amount detection device.

Hereinafter, the present invention will be explained with reference to the illustrated embodiments.

In FIG. 6, 17 is the photoelectric detector 6 of FIG.
Similarly, it is a photoelectric detector consisting of a plurality of photoelectric detection elements, and is electrically divided into an X-Y coordinate system for a red bright spot, a green bright spot, and a blue bright spot, with the same X axis as shown in Figure 7. It has a photoelectric detection surface 18 that can be divided, and sends out electrical outputs V ₁ to V ₈ proportional to the amount of incident light for each of the divided regions 18 ₁ to 18 ₈ . The distance between the vertical axes of the above coordinate systems, that is, the Y _R axis, the Y _G axis, and the Y _B axis corresponds to the phosphor pitch 1S and is a distance corrected by the optical lens system 8. Electrical output V ₁ of each division area
~ _V8 is supplied to the arithmetic circuit 19. Arithmetic circuit 1
9 is configured as shown in FIG. 8, and a color designation signal c
Select the corresponding coordinate system based on the above electrical output
A first calculation unit (AMP is an amplifier) that calculates the amount of incident light in each quadrant from V ₁ to V ₈ and sends out electrical outputs V ₁ to V ₄ for each quadrant is connected to the above electrical outputs V ₁ to V ₄ , the horizontal and vertical position deviations of bright spot 3 △H, △V
It is also connected to the arithmetic circuit shown in FIG. 4 (referred to as the second arithmetic section) which calculates the brightness I. R ₁ and R ₂
is a relay that switches the arithmetic unit 19 for each color, and is controlled to open and close by the color designation signal c.
However, if the red designation is specified, relays R ₁ and R ₂ are both opened (referring to the opposite connection from what is shown in the diagram); in the case of the green designation, only relay R ₂ is opened, and in the case of the blue designation, relays R ₁ and R 2 are opened. ₂ are both closed.

The other configurations are the same as the configuration of the conventional device shown in FIG. 1, so the explanation will be omitted.

In the above configuration, the bright spot 3 imaged on the fluorescent surface of FIG. 5 forms an image (31
The misconvergence detection function will be explained for the case where _R : red, 31 _G : green, 31 _B : blue).

First, when a red bright spot is projected on the tube surface of the CPT 1, relays R ₁ and R ₂ of the calculation circuit 19 are connected as shown in FIG. 8 by the color designation signal c, and an image is formed on the divided photoelectric detection surface 18 31 _R occurs. This results in
Each quadrant output V ₁ to _{V 4} of the first calculation section of the calculation circuit 19
is as follows, V ₁ = V ₁ (18 ₁ ) + V ₅ (18 ₅ ) + V ₆ (18 ₆ ) V ₂ = V ₂ (18 ₂ ) V ₃ = V ₃ (18 ₃ ) V ₄ = V ₄ (18 ₄ ) + V ₇ (18 ₇ ) + V ₈ (18 ₈ ) The above output is supplied to the arithmetic circuit shown in FIG. Signals ΔH, ΔV and sum signal I are output. Therefore, as in the case of the conventional device, the position of the bright spot 3 on the tube surface is determined based on the deviation signals ΔH and ΔV, and its imaging center is aligned with the Y _B axis of the detection surface 18 and the X It is corrected until it is located on the intersection point Q _R with the axis, and its horizontal and vertical position correction amount △H _R
and △V _R are displayed on the red position indicator _13R .

Next, when the color designation signal c is switched to green G, a green bright spot image _31R is formed on the divided photoelectric detection surface 18, and on the other hand, the relay _R2 is closed. Arithmetic circuit 1
9, V ₁ = V ₁ (18 ₁ ) + V ₅ (18 ₅ ) V ₂ = V ₂ (18 ₂ ) + V ₆ (18 ₆ ) V ₃ = V ₃ (18 ₃ ) + V ₇ ( 18 ₇ ) V ₄ =V ₄ (18 ₄ )+V ₈ (18 ₈ ) is obtained, and the arithmetic circuit 19 outputs horizontal and vertical position deviation signals ΔH and ΔV. Along with this, the bright spot on the tube surface of the CPT 1 is corrected until its imaging center is located on the intersection Q _G of the Y _G axis and the X axis of the photoelectric detection surface 18, and this horizontal and vertical position correction amount ΔH _G and ΔV _G are displayed on the green position indicator _13G . Similarly, when blue is designated by color designation signal c, relays R ₁ and R ₂ are closed, and the following V ₁ to V ₄
is output from the first arithmetic unit. That is, V ₁ = V ₁ (18 ₁ ) V ₂ = V ₂ (18 ₂ ) + V ₅ (18 ₅ ) + V ₆ (18 ₆ ) V ₃ = V ₃ (18 ₃ ) + V ₇ (18 ₇ ) + V ₈ (18 ₈ ) V ₄ = V ₄ (18 ₄ ) Therefore, as in the case of red and green bright spots, CPT
The position of the blue bright spot on the fluorescent surface 1 is located at the intersection Q B of the Y _axis and the X axis of the divided photoelectric detection surface 18 _B.
The horizontal and vertical position correction amounts △H _B and △V _B are controlled until the position is at the top of the blue position indicator 13.
displayed on _B.

In this way, the amount of misconvergence after defining the arrangement order of the phosphors is detected regardless of the relative position of the divided photoelectric detection surface and the phosphors.

It is obvious that the same effect can be obtained even if the divided photoelectric detection surface 17 of this embodiment can be used as a divided surface whose entire surface can be electrically divided at predetermined intervals (corresponding to 1S pitch).

As described above, in the present invention, the divided photoelectric detection surface of the photoelectric detector can be electrically divided into a plurality of X-Y coordinate systems having a common X axis, and by specifying a color, the divided photoelectric detection surface of the photoelectric detection body can be electrically divided into a plurality of One XY coordinate system is selected, the amount of incident light in each quadrant of the coordinate is calculated, and the positional deviation amount of the image formation with respect to the coordinate origin, that is, the detection base point is detected, so the arrangement of the detection base points is By specifying the arrangement order to be the same as the arrangement order of the phosphors, simply by switching the color designation signal, regardless of which phosphor the detection axis of the split photoelectric detection surface faces, It is possible to reliably detect the amount of misconvergence of the electron beams for each color of the three-electron gun in-line arrangement type color picture tube.

Further, the present invention can be easily applied to static convergence, dynamic convergence adjustment, deflection yoke adjustment, etc. of CTV.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing a conventional misconvergence amount detection device, Figure 2 is a diagram showing the photoelectric detection surface of the conventional device, Figure 3 is a waveform diagram, Figure 4 is a circuit diagram of the arithmetic circuit, and Figure 5. 6 is a block diagram showing the misconvergence amount detection device according to the present invention, FIG. 7 is a diagram showing the detection surface of the photoelectric detector in FIG. 6, and FIG. 8 is a diagram showing the fluorescent surface of a color picture tube. is a circuit diagram of an arithmetic unit. In the figure, 1 is a color picture tube, 3 is a bright spot, and 8
10 is an optical lens system, 10 is an arithmetic circuit, 11 is a video signal generation control device, 13 _R , 13 _G and 13 _B are position indicators, 17 is a photoelectric detector, and 18 is a photoelectric detection surface. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A video signal generation control device that projects a colored bright spot on the surface of a color picture tube by transmitting a video signal and a color designation signal, and corrects the position of the colored bright spot by an amount corresponding to the input; a position indicator for displaying the amount of position correction of the colored bright spot;
It has a divided photoelectric detection surface that can be electrically divided into three orthogonal coordinate systems with a common axis and whose Y-axis pitch corresponds to the picture tube phosphor pitch, and each divided area sends out an electrical output proportional to the amount of incident light. a photoelectric detector, an optical lens system that images the colored bright spot on the photoelectric detection surface;
A first circuit that receives the electrical output, selects the predetermined electrical coordinate system in accordance with the input color designation signal, and calculates the amount of incident light in each quadrant of the coordinate system.
an arithmetic circuit comprising an arithmetic section and a second arithmetic section that receives the output of the first arithmetic section and calculates and outputs the amount of positional deviation of the image with respect to the origin of the coordinate system; A misconvergence amount detection device for a color picture tube, characterized in that an output is input to the video signal generation control device.