JP2751182B2 - Landing measurement apparatus and method for color picture tube - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color picture tube landing measurement apparatus and a measurement method suitable for measuring the color picture tube landing.

[Summary of the Invention]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color picture tube landing measuring device and a measuring method suitable for measuring a color picture tube landing, and relates to a color image pickup means which is opposed to a color picture tube to be measured so as to take an image as a field of view. A stair-wave current generating means for supplying a stair-wave current for changing the deflection angle of the beam of the color picture tube in a predetermined field unit to a sub-deflecting means provided in the color picture tube; and The obtained data is the staircase current 1
It has signal processing means for calculating the landing amount by calculating over a cycle, and display means for displaying the calculation result of the signal processing means. It is an object of the present invention to obtain a landing measurement device and a measurement method thereof that can easily change a measurement point according to a type.

[Conventional technology]

Conventionally, in a color picture tube, a state in which an electron beam emitted from an electron gun passes through an aperture grill or a shadow mask and stimulates a predetermined phosphor to emit light is called an electron beam landing, and is called an electron beam center. When the center of the dot or stripe of the phosphor is shifted, the amount of the shift is called the landing amount. As a conventional measuring method for measuring such a landing amount, a null method using a sub deflection unit in addition to the main deflection unit is known. The zero-point method is described in detail in Japanese Patent Publication No. Sho 57-10632, and the details thereof will be omitted. The outline of the method will be described with reference to FIG. 10. In FIG. Now consider the fluorescent pattern (1B) in the form of blue dots or stripes on the phosphor screen with the body applied. M is Apachaguriru or shadow mask, D _M is the deflecting surface of the main deflection means, D _S is the deflection surface of the auxiliary deflection means, the distance between the fluorescent pattern (1B) inside and Apachaguriru Q, the main deflection means When the distance to the deflecting surface D _M and fluorescent pattern (1B) inside L, and the distance between the deflecting surface D _S of the deflecting surface D _M and the sub deflecting section of the main deflection means and Z, emitted from the blue electron gun and the blue electron beam (2B) is deflecting surface D _S of the deflecting surface D _M unless if the sub main deflection means magnetic field of the main deflection means, D _M
Through the point (3B) (4B) that crosses the blue fluorescent pattern (1
This corresponds to the center point (5B) of B). Now, the deflecting surface D _S of the sub-deflection means
Blue electron beam (2B)
The displacement at the position of the deflecting surface D _M of the angle θ only deflected by the sub deflecting section of the deflecting surface D Italy main deflection means one point from (3B) to the other point of the deflecting surface D _M of the main deflection means (6B) of _S ΔS is generated. It is deflected further by the deflecting surface D _M of the main deflection means Apachaguriru M
Beam (2B) through the passing point M ₀ blue fluorescence pattern (1
A point (7B) shifted by Δd from the center point (5B) of B) is hit. At this time, the minute magnetic field and the deflection angle θ supplied to the deflecting surface D _S of the sub-deflection means is proportional to this deflection magnetic field can be made proportional to the current I flowing through the solenoid coil of the sub-deflection means.

In Fig. 10, triangles (5B), (7B) (M ₀ ) and triangle (4
B), (6B), and (M ₀ ) have a similar relationship, And the proportional constant between the exciting current I and the deflection angle θ is K
ΔS = Ztanθ Zθ = Z · KI (2) By substituting equation (1) into equation (2), Thus given the geometric relationship of the measured system deviation on fluorescers mosaic Δd can be obtained from the exciting current I supplied to the sub-deflection means D _S.

[Problems to be solved by the invention]

When the landing amount is measured using such a principle, the observer uses a microscope to directly observe the movement of the light emitting point, and thus there is a disadvantage that it takes a few hours to measure one tube. Japanese Patent Publication No. Sho 57-10632 discloses a configuration in which the above-mentioned disadvantages are improved by using such a principle of the null method. In this improved method, a certain luminescent point in a landing state is symmetrically oscillated with respect to the luminescent center while oscillating both luminescent points by an equal amount, and a point where their corresponding outputs become equal is found. It is a configuration.

Further, the present applicant has proposed a landing measuring apparatus for a color picture tube as disclosed in JP-A-50-93730. That is,
Cathodes K _R of the three electron guns by providing the auxiliary deflection means D _SM behind the main deflection means D _MM provided a color picture tube (6) as shown in FIG. 11, K _G, is released from K _B Electron beam (2R)
(2G) and (2B) pass through the aperture grill M and hit the fluorescent pattern P on the tube surface PN to emit stimulus light.

A color component detector (10) for detecting a color component of an image reproduced from the color picture tube (6) is provided in front of the color picture tube (6).

The color component detector (10) converts the color image condensed by the lens (7) into scattered light by the diffuser (8), and converts the color image into red (R) light.
Green (G) blue (B) R, G, B filters (9R), (9G), (9
B), these R, G, B filters (9R), (9G),
The light is supplied to photodetectors (10R), (10G), and (10B) such as photodiodes provided behind (9B).

The light detecting element (10R), (10G), the detection output and the color picture tube (10B) compared in the comparison circuit for supplying color component signals (6), sub-deflection means to compare the output of the comparator circuit D _SM
And the landing measurement is performed.

In the above-mentioned Japanese Patent Publication No. 57-10632, the landing amount is determined from the luminance difference in order to shorten the measurement time, and it is assumed that there is a proportional relationship represented by a linear equation between them. Therefore, there is a problem that an error occurs in a region that is not in a proportional relationship.

Furthermore, in the method disclosed in Japanese Patent Application Laid-Open No. 50-92730, photodetectors (10R), (10G), and (10G) with R, G, and B filters (9R), (9G), and (9B) for each measurement point are provided. 10B), R, G, B filters and photodetectors are required for each measurement point. If the number of measurement points increases, the cost increases, including the amplifier, and if the surface of the color picture tube changes, There was a trouble that the measuring points had to be rearranged for each tube surface size.

The present invention has been made in view of the above points, and its purpose is to reduce the measurement time, increase the number of measurement points, and easily change the color picture tube even when the tube type is changed. An object of the present invention is to obtain a landing measuring device and a measuring method thereof.

[Means for solving the problem]

The color picture tube landing measuring apparatus of the present invention is provided on a color picture tube (6) and a color image pickup means (14) arranged to face each other so as to take an image of the entire screen of the color picture tube to be measured (6) as a field of view. Staircase current generating means (19), (22), (2) for supplying a staircase current for changing the deflection angle of the color picture tube (6) to the sub-deflecting means _DSM in predetermined field units.
3), a signal processing means (26) for calculating a landing amount of data obtained from the color imaging means (14) at the time of supplying the staircase current over one cycle of the staircase current, and an operation result of the signal processing means (26) Display means for displaying (21)
And

Landing measuring method for a color picture tube of the present invention, the entire screen was color imaging as a viewing, auxiliary deflecting means D _SM in the field unit provided on the color picture tube (6) to be measured for color picture tube (6) Supplies a staircase current that changes the deflection angle of the beam of the color picture tube (6), and calculates the landing amount over one cycle of the staircase current based on the data obtained from the color imaging means (14) when the staircase current is supplied. Then, the calculation result is displayed.

[Action]

The screen of the color picture tube (6) to emit light of a single color raster color by the coil of the sub-deflection means D _SM attached to a color picture tube (6) the neck by passing a staircase move the electron beam The light emission luminance at a predetermined measurement point of the picture tube (1) is detected by the color imaging camera (14), the output of the color imaging camera (14) is calculated by the signal processing means (26), and the result is monitored by the monitor television (21). The present invention provides a landing measuring device and a measuring method which can easily change even if there is a change in a pipe type or a change in a measurement point by shortening the measurement time as shown in FIG.

〔Example〕

Hereinafter, an embodiment of a color picture tube landing measuring apparatus according to the present invention will be described with reference to FIGS. First
First, the principle of the present invention will be described with reference to FIGS. 5 to 8.

FIG. 5 is a schematic side sectional view showing a relationship between a fluorescent stripe of a Trinitron tube (trade name) and an electron beam.
Denotes a cross section of a stripe extending in a direction perpendicular to the plane of the paper, and CS denotes a cross section of a carbon stripe similarly configured. The electron beam (2B) is trapezoidal because the beam density is considered trapezoidal on the fluorescent stripe surface. In this example, the electron beam center (2BC) shown in Fig. 5
The state in which the fluorescent stripe center PSC coincides with the fluorescent stripe center PSC is called just landing, and the deviation Δβ between the electron beam center (2BC) and the fluorescent stripe PSC is called the landing amount.

6, A, B, and C show the beam moving state in the plan view of FIG. 5. The state shown in FIG. 6A shows the just-landing state, and the electron beam (2B) in this state is monochromatic. The output of the luminance signal detected by the monochromatic photosensor as a beam is as shown in FIG. In FIG. 7, the just-landing area AB moves the electron beam (2B) shown in FIG. 6A to the right or left so that the electron beam (2B) shown in FIG.
B) is a state immediately before the chipping of the fluorescent stripe PS starts, and the electron beam (2B) further moves rightward or leftward from the state of FIG. The state up to C is shown. Mislanding area
MA indicates a completely mislanded state. As can be seen from FIG. 7, when the monochromatic electron beam is moved in a fixed step, the luminance signal output detected by the photosensor with the monochromatic filter is Gaussian in which the luminance decreases at a constant rate as shown by a curve (28). The distribution is shown. Beam missing area on the left side of curve (28) showing such luminance characteristics
Let L (X) be a straight line that is in contact with the luminance gradient of BC, and let R be a straight line that is in contact with the luminance gradient of the beam lacking area BC on the right side.
Considering a linear expression in which (X) is used, X is a beam position, and Y is a luminance level direction, a schematic diagram in which the beam positions are sampled at predetermined intervals is shown in FIG. This linear expression is represented by Y = aX + c, a Y = L (X) = a L X + c L ··· (4) Y = R (X) = a R X + c R ··· (5). Here, the slopes a _L and a _R and the intercepts c _L and c _R are the sampling points (x ₁ y ₁ ), (x ₂ y ₂ ), (x ₃ y ₃ ), and (x ₄ y ₄ ) shown in FIG.
Required from. That is, in FIG. 8, the just landing point JP of the beam position in the X-axis direction is defined by straight lines L (X) and R (X).
Is considered to be a point that intersects the X axis with the vertical that is lowered in the X axis direction from the intersection CP of the .times., And the unknown landing amount can be expressed by the following equation (6).

In this equation, since the equation is complicated and requires a lot of calculation time, the following equation is obtained by using the fact that the absolute values of the slopes of the straight lines L (X) and R (X) are substantially equal to each other and using one of the slopes.

This is the beam position data obtained from the luminance data of the three samplings, that is, the landing amount.

FIG. 1 shows processing means for obtaining sampling points based on such a principle.

In FIG. 1, a television receiver (11) has a color picture tube (6) and a television circuit (12), and the neck of the color picture tube (6) has a main deflecting means _DMM and a sub- _drum. Deflection means D _SM
Are arranged.

For example, a color imaging camera (14) such as a three-plate CCD color camera or a MOS type color camera is disposed at a position facing the tube surface (24) of the color picture tube (6). The color imaging camera (14) is arranged at a position where an image of the entire field of view projected on the tube surface (24) of the color picture tube (6) can be imaged using a zoom lens (13) or the like.

The color of the surface of the color picture tube (6) is the signal generation circuit (20)
Is controlled by The signal generation circuit (20) supplies a composite video signal (25) for causing the tube surface (24) to emit all monochromatic light in R, G, B or white (W) to the television circuit (12),
Through the television circuit (12), the screen (24) is changed to R, G, B
To emit all single colors sequentially or to emit only a single color only white. This selection is based on Fig. 7 where the landing amount is just landing area AB or beam missing area BC.
In this case, the surface of the tube is illuminated in white when it is inside, and when it is in the mislanding area MA in FIG. 7, it is possible to perform the landing measurement by sequentially illuminating the surface of the tube R, G, B. Tube surface (2
4) The above measurement points are stored in the frame memory (18
R), (18G) and (18B) correspond to the horizontal measurement area (27) as shown in the schematic diagrams.

The set position of the horizontal measurement area is shown as 5 rows × 5 columns = 25 places in FIG. 2, but it can be selected as appropriate and is actually 7 rows × 5 rows as shown in FIG. It has nine rows of measurement areas. Each frame memory (18R), (18
G), (18B) each horizontal measurement area (27) is 0,1,2 ‥
{N} k addresses (k is the maximum address of the horizontal measurement area), and these addresses are stored in the signal processing means (2
Specify with the frame memories (18R), (18G), and (18B) in 6). The signal processing means (26) includes, for example, an 8-bit analog-digital conversion circuit (denoted as A / D) (17R), (17R).
G), (17B), frame memory (18R), (18G), (18
B), which comprises a microprocessor (19) and performs a landing operation process. This operation process is described later in each of the horizontal measurement areas (27) with the front surface (24) emitting monochromatic light on the front surface (11).
All luminance data in the field Is calculated as Here, K is the maximum address f described above.
(N) is the luminance data at address n.

A microprocessor (19) in the signal processing means (26) generates a staircase wave as shown in FIG. 3, converts this staircase wave data into an analog signal by a digital-analog conversion circuit (22), and generates a power amplifier ( It has been made so as passing a staircase current in the auxiliary deflection means D _SM coils mounted on the neck of the color picture tube (6) through 23).

As shown in FIG. 3, the staircase current is a current waveform that is increased in steps of a fixed amount (10 .mu. To 30 .mu.) In steps of one field or one frame, for example, in one cycle of measurement, for example, in 11 fields (or 11 frames). Have been. The vertical axis indicates the deflection angle of the potential beam by the beam scan width.

The landing measurement procedure in the above configuration will be described below.

First, when it is recognized that the landing amount of the color picture tube to be measured (6) does not enter the mislanding area MA as shown in FIG. 7 (when used as a landing adjuster), a signal generating circuit ( From 20), a raster is generated so that the tube surface (24) of the color picture tube (6) shines white. Also, the just landing area AB in FIG.
Or in the game lacking area BC (when used as a measuring device), generate a monochromatic raster of R, perform a landing measurement, generate a monochromatic raster of G, perform a landing measurement, and then perform a monochromatic raster of B Is generated and a landing measurement is performed. Thus, the signal generation circuit (2
0) generates a monochromatic raster (for example, white) in the color picture tube (6) to be measured. Next Digital - supplying a staircase waveform current to the coil of the sub-deflection means D _SM via analog converter circuit (22) Pawaanpu (23). During this staircase is one field as shown in FIG. 3 (or one frame), such that the current one scan step minute successively positive and negative directions from the interval without the current I ₀₀ flows through the coil is increased or decreased It consists of 11 steps of staircase current.

First, a sub-deflection means D _SM of the color imaging camera while moving the flow electrons rice free of current -5I ₀ of FIG. 3 in the coil (14) is a white emitting the electron beam vibration in current -5I ₀ The entire field of view of the tube surface (24) is imaged. The output of the color imaging camera is digitized by A / D (17R), (17G), and (17B). This digital data is stored in the frame memory (18
R), (18G), and (18B). Frame memory (1
8R), (18G), and (18B), for example, horizontal measurement areas (27), (27a), (27b) as shown in FIG.
If it has (27x), the microprocessor (19) reads out the luminance data of each point of 5 rows × 5 columns and stores it in the main memory (not shown) in the microprocessor (19). . Then swung electron beam position by passing a staircase waveform current of -4I ₀ in the coil of the sub-deflection means D _SM, above and by white light emission is similarly electron beam current -4I ₀ is swung tube The entire field of view of the surface (24) is imaged, the imaging output is A / D stored in the frame memory, and the horizontal measurement areas (27), (27a),
(27b) The luminance data of each point of ‥‥ (27x) is read into the main memory of the microprocessor (19), and the same operation is performed by the staircase currents −3I ₀ , −2I ₀ , −I ₀ , I ₀₀ , I _0. , 2I ₀ , 3I ₀ , 4I ₀ , and 5I ₀ for all 11 fields (frames), and these data are all stored in the main memory of the microprocessor (19). FIG. 4 shows a change in the luminance signal of one horizontal measurement area (27) when the beam position is moved in this manner. That is, in FIG. 4, the vertical axis represents the imaging output from the color imaging camera (14), and the horizontal axis represents the electron beam movement position. In order to obtain the value of X in the above-described equation (7), that is, the landing amount, first, the fourth
Find the maximum value that is the peak data value (29) in the figure. The peak data value (29) is multiplied by a threshold coefficient (approximately 0.9 in an experiment) which is a ratio of the luminance at the time of just landing to the luminance immediately after the occurrence of the beam chipping to obtain a threshold (30). For this reason, as shown in FIG. 4, the luminance array data is scanned right and left from the position of the peak data value (29), and the left side becomes smaller than the threshold value (30). Data (x ₁
y ₁ ), the previous data is (x ₂ y ₂ ), and the luminance data when the threshold value on the right side is smaller than the threshold value (30) is (x ₃ y ₃ ). Desired.

Such an operation is performed by the microprocessor (19).

In the present invention, one cycle of measurement is performed 11 times,
Although it takes a measurement time of × 16 msec (11 × 32 msec), the data acquisition time can be kept constant regardless of the number of measurement points.

When used as an adjuster for corner landing measurement or the like, the color imaging camera (14) takes in the white light of the color picture tube (6) and outputs R, G, B at the same time.
R), (17G), and (17B) can be output simultaneously.
When used as a measuring instrument that emits all monochromatic light on the tube surface in order of G and B, for example, if R is an R / A (17R) that only operates according to the color of the monochromatic raster on the tube surface (24) Of course.

FIG. 9 shows an example of a display pattern at the time of landing measurement (adjustment) displayed on the screen of the monitor television (21) shown in FIG. 1. The circled portion indicates the tube of the color picture tube to be measured. Each measurement point on the surface (24) is shown, and 7 rows × 9 columns = 63 measurement points are shown. The lower numbers indicate that the value of X in the formula (7) is-by left and + by right. In addition, the vertical pattern (31)
Is projected on the monitor TV (21) for convenient adjustment. Color reception is performed by adjusting the vertical pattern (31) to the measurement point as shown by the arrow (adjusting the magnet for corner landing adjustment). The tube (6) is brought into the just landing state.

In this example, the case where the calculation of the landing measurement is performed by the microprocessor (19) has been described, but the A / D (17R),
It is needless to say that various modifications can be made without departing from the gist of the present invention without being limited to the above embodiment, such as calculating the outputs of (17G) and (17B) using wiring logic. is there.

〔The invention's effect〕

According to the present invention, the landing on the entire surface of the color picture tube to be measured can be accurately measured in a short time. That is, conventionally, a measurement time of 0.7 seconds per horizontal measurement area is required. In the example of (1), the time is as long as 0.7 × 63 = 44.1 seconds, but in the present invention, the measurement can be performed in 0.2 seconds regardless of the measurement point.

Further, when changing the measurement points and the number of measurement points, it is only necessary to change the address position setting conditions in the memory. It can be easily performed, and even if the tube size of the color picture tube to be measured changes, it is only necessary to perform zooming adjustment with a zoom lens when imaging the entire field of view of the tube surface. Has the effect of

[Brief description of the drawings]

FIG. 1 is a system diagram showing one embodiment of a color picture tube landing measuring apparatus according to the present invention, FIG. 2 is a schematic diagram showing a measurement area on a frame memory, and FIG. FIG. 4 is a waveform diagram of luminance data corresponding to a scanning waveform of an electron beam, FIG. 5 is a schematic diagram showing a relationship between an electron beam and a phosphor, and FIG. 6 is a diagram of FIG. FIG. 7 is a luminance characteristic diagram, FIG. 8 is a waveform diagram for explaining the principle, FIG. 9 is a screen pattern diagram showing an example of a display pattern on a measurement display screen, FIG. 10 and FIG.
FIG. 11 is a beam state diagram for explaining a conventional example. (6) is a color picture tube, _DSM is sub-deflecting means, (14) is a color imaging camera, (17R), (17G), (17B) are A / D,
(18R), (18G), (18B) are frame memories, (19)
Is a microprocessor, (22) is a D / A, and (26) is a signal processing means.

Claims (2)

(57) [Claims] 1. A color image pickup means which is arranged to face the entire screen of a color picture tube to be measured so as to take an image as a field of view, and a sub-deflection means provided in said color picture tube is provided in predetermined field (or frame) units. A staircase current generator for supplying a staircase current for changing the deflection angle of the picture tube; and calculating a landing amount over one cycle of the staircase current from data obtained from the color imaging means when the staircase current is supplied. A landing measuring device for a color picture tube, comprising: signal processing means; and display means for displaying a calculation result of the signal processing means. 2. A color image is taken with the entire screen of a color picture tube to be measured as a field of view, and a deflection angle of a beam of the color picture tube in a predetermined field (or frame) unit by a sub-deflecting means provided in the color picture tube. And supplying a staircase current for changing the value of the staircase current, calculating a landing amount of the data obtained from the imaging means over one cycle of the staircase current, and displaying the calculation result. A landing measuring method for a color picture tube, characterized by the following.