CN1014945B - Method and machine for automatic measurement of convergence and determination of corrections to be made in trichromatic cathode tube deflectors - Google Patents

Abstract

For automatically determining the calibration characteristic of a deflector of a tricolor cathode ray tube, the coordinate measure is performed at the centre point of a red and green color bar of a cross color bar measuring graph at the 'key point', as the deflector is arranged at the 'even' position of the tube, the measured value is standardized by calculation to rebuild an ideal position of the deflector, and then the convergence errors of the deflector is worked out, by which the point and general calibration are derived.

Description

Method and machine for automatic measurement of convergence and determination of corrections to be made in trichromatic cathode tube deflectors

The present invention relates to a kind of in trichromatic cathode tube for obtaining correctly to assemble measurement of convergence and determining the method for the correcting value of deflector automatically, simultaneously, also relate to the machine of using this method.

In general, trichromatic cathode tube deflectors convergence errors can occur in manufacture process, is that this error of carrying out under the situation of extreme care also is difficult to avoid even make.At present, when these errors when not being very little, must on the correct position of the standard trichromatic cathode tube that has the color bar test pattern to show, regulate each deflector in order to proofread and correct these errors operator.Then, according to the image deformation of seeing on crt screen (distortion), deflector is carried out machinery to the operator and/or magnetic is regulated, and in the place that he thinks fit, arranges the magnetic correction portion on deflector.The final correction mass that obtains depends on that operator's experience and he set up the correct relation between the viewed phenomenon and the required adjusting of carrying out on the screen.Even for a unusual experienced operators, the trimming process of this form also is quite slow: on average each deflector needs 2～4 minutes.

The purpose of this invention is to provide method for automatic measurement that deflector assembles and determine the method for quality of preset deflector and make above-mentioned correction reach best as far as possible according to " good/bad " standard, the fastest, and do not need the operator to determine the method for the number of the position of correcting unit of each deflector and these parts.

Another object of the present invention provides a kind of machine that can provide the characteristic of the required all corrections of each deflector automatically and fast, and simple and cost cost of this machine usage is minimum.

Method of the present invention comprises that deflector that each is regulated or preregulated mechanically and/or be placed on same position with reference to the neck of (standard) cathode ray tube on magnetic, on the screen pipe curtain of this pipe, produce the cross color-bar test pattern, on several points of color bar signal, measure the absolute coordinates of the longitudinal axis of these colour bars, preferably 9～25 of this points, these points are preferably equally distributed and be symmetrical with respect to the vertical and trunnion axis of screen surface preferably on screen, the deviate of the coordinate of the electron beam of two different electron guns of calculating, carry out standardization then, the data of promptly proofreading and correct gained are with the position that does not regulate of considering deflector and/or in the convergence errors of the center of pipe and/or the deviation of used pipe and desirable pipe, thereby obtain numerical value corresponding to the correct ideal position of deflector, and it is correct or incorrect deriving used deflector thus, and promptly whether its parameter is in the scope of a certain permission.With the deviate of the coordinate that calculates like this, the convergence parameter of tested deflector just can be determined by known method.According to an advantage aspect of the present invention, necessary various correcting values can obtain by the convergence parameter of standardized value and acquisition and different numerical value in the table that method is by experiment set up are in advance compared.Overall or fixed point (pointwise) corrected value that should on deflector, carry out corresponding to various criterion value (as the function of various standardized values) that this table provides.According to these standardized values, just can determine from standardized value to the adjusting of fixing as yet main feed line circle deflector with respect to the line circle.

Machine according to the present invention comprises: the measurement bracket that supports cathode ray tube, the deflection circuit of power supply and this pipe, pattern generator, the measurement mechanism of each regional coordinate of cathode ray tube screen, the device that the data that measurement mechanism is provided are handled, described processing unit comprise decision luminous line axis coordinate circuit, coordinate values become standardized value translation circuit, store the storage facility of the table of corresponding relation between standardized value and the necessary correcting value and a comparison circuit.

The present invention will from below in conjunction with accompanying drawing to detailed description that an embodiment did and understood better.

Fig. 1 is the block diagram according to machine of the present invention;

Fig. 2 is the simplified plan view that is placed on the measurement mechanism on the cathode ray tube machine screen according to of the present invention;

Fig. 3 is the rough schematic view that is used to explain the colour-bar test pattern of bearing calibration of the present invention to Fig. 5.

Measurement bay as shown in Figure 1 at first comprises a what is called " reference " cathode ray tube 1, it can be common high-quality trichromatic cathode tube, but according to embodiments of the invention, with be triniscope (being provided with equally) with common tri-color tube, without shadow mask and have an even green fluorescence coating.The picture tube of this kind form is more sensitiveer than common tri-color tube, can obtain a continuous row on screen, so just might measure all luminous points (entire spot)

Pipe 1 is by the in addition very high voltage of common generator 2.Tested deflector 3 is placed on the neck of pipe 1.Handle operation in order to simplify, and make the operation can automation, deflector 3 is fixed on the normal place of pipe, all deflectors that will measure all are placed on this position, and this normal place is a series of mean places that are accredited as the tram of the measured multiple deflector that regulates of matter on the prior art measurement bay.

Deflector 3 is received on the common sweeping generator 4.Pipe 1 is linked on the pattern generator 5, this pattern generator 5 can produce the level and vertical color-bar test pattern of checker, and the brightness of colour bar is by the relation modulation of the approximate Gaussian of for example describing in No. 8304981, French Patent (FRP) that the applicant submits at least.Generator 5 is alternately linked on three rifles of pipe 1.

Measurement mechanism 6 is put on pipe 1 the screen, and this device 6 has the some transducers 7 on respective holder of being placed in 8, and what for example 9 transducers were located at screen tests the most effective " key " position to assembling, these positions are, for example, four angles, the mid point of center and four edges.Certainly, transducer 7 is set as the center that the colour bar that horizontal color-bar test pattern 9 and vertical color-bar test pattern 10 are produced can pass transducer 7.As what described French Patent (FRP) proposed, transducer can be along the direction setting perpendicular to the colour bar axis, but such arrangement is when when horizontal colour bar forwards vertical colour bar to, the necessary half-twist of transducer.According to an advantage of the present invention, transducer 7 with respect to the direction setting at 45 of colour bar axis in cartesian coordinate system, to obtain deviate, then the deviate that records be multiply by $\mathrm{1/}\sqrt{2}=\sqrt{2}\mathrm{/2}$ 。All will measure with vertical colour bar level, order is (vertical after the first level, or vertical earlier back level can) in no particular order.

According to the similar method of described French Patent (FRP), measure with circuit 11 and to assemble, for tri-color tube, by the deviation between the colour bar position of measuring two different electron beams.If as top said, sensor perturbations is at 45, then the result be multiply by again $\sqrt{2}\mathrm{/2}$ 。

Determine that the quality and the essential correcting value of deflector can realize by measuring tri-color tube, the most handy certainly with the green pipe of three rifle formulas of shadow mask, as mentioned above.

Then, resulting thick measurement result is by circuit 12 standardization in addition, and promptly measurement result is converted to rebulid the value that deflector should obtain in place, standardization measuring position.This position is the common position of measuring deflector on cathode tube, promptly being focused at the center is zero, when deflector when neck rotates, the central horizontal line of color-bar test pattern is corresponding to the mechanical trunnion axis of the glass shell (screen) of pipe and can balanced transversal electron beam (red and blue) position of the convergence errors of (screen is grown the central authorities on limit) on for example 6H and 12H point when deflector moves (translation or inclination) along X and Y.(the screen periphery each point can with the similar method representation of wrist-watch figure: 12 hours, 5 hours, or the like).Like this, for a kind of deflector of pattern, may determine the variation relation of convergence according to the convergent geometry of the position that is positioned at the deflector on the neck (by rotation or moving) and center along X and y-axis shift.Can derive the necessary correction of the measured value that is located at the deflector of fixed position on the neck to be measured to rebulid the value of deflector under normal place from these relations.These correcting values are according to some indicating devices, for example central (center) convergence errors, and alignment (parallel) error of the 3H～9H of green color-bar test pattern (promptly passing through the horizontal colour bar of screen center) is positioned at the red/blue balanced error etc. of assembling between 6H～12H.

If variation relation is simplified to linear relationship (this point can accomplish preferably that generally higher if desired precision can be set up more complicated relation), according to following example, described correcting value just can be determined simply:

At a P place, get the rough measure value ph and the pv of the level of corresponding respectively to and vertical color-bar test pattern, establish C _xAnd C _yIt is convergence errors (respectively between horizontal colour bar and vertical colour bar) in the center, and establish Av and Cv and be field amplitude and red blue beam at 6H and 12H(promptly in the centre of bottom of screen and top larger skirt) the crooked amount of the convergence balanced error located, these values Av and Cv can be expressed from the next:

Av＝ (M12H-M6H)/2 Cv＝ (M12V-M6V)/2

M12H, M6H, M12V and M6v are respectively horizontal colour bar (H) and vertical colour bar (the rough measure data v) on the 12H of screen and 6H point.

The standardized value NH and the NV(of these rough measures is positioned between level and vertical colour bar) can represent by following relationship:

NH＝PH-a.Cx-b.Cy-c.Av-d.Cv

NV＝PV-e.Cx-f.Cy-g.Av-h.Cv

In these relations, coefficient a, b ... h is the coefficient of the above-mentioned convergence variation relation of each relevant parameter of p point place.

All aforementioned calculation all can be undertaken by the computer that is composed of corresponding program, and the method for programming is known the people of technical field.

When on cathode ray tube neck, testing,, just can obtain the less relatively convergence balanced error of 6H/12H place amplitude (be generally less than or equal 1mm) if the choice of location of deflector gets better.Therefore, in most of the cases, assemble variation relation and can be reduced to linear relationship.

Above-mentionedly carry out standardized means by calculating, equally also can introduce the other correction of representing deviation in the convergence characteristics of pipe, at this moment, the measurement on described pipe is carried out with reference to pipe with respect to " ideal ".Described other correcting value can by with the standardization similar methods, each measurement point is carried out.

The standardized value that circuit 13 obtains computer 12 outputs compares with corresponding ideal value.These ideal values are stored in the memory of circuit 13, and circuit 13 is compared them with standardized value.

The difference signal (convergence drift) that circuit 13 produces can be exported on the 13A at it and obtain, this difference signal can from described output 13A deliver to any respective handling device for example in storing apparatus, tape deck or the statistical processing device to control product quality.

In addition, output 13A is linked in the decision maker 14.Described decision maker 14 consists essentially of a threshold circuit.The threshold value of circuit is corresponding to the maximum permissible value of standardized value or convergence drift (permissible variation depend on the specification of transducer or standard and to the understanding and the experience of product).Described circuit 14 has two outputs; Corresponding to the 14A(of " correctly " in tolerance threshold) with corresponding to the 14B of " incorrect ".Certainly, be " correctly " if deflector is differentiated, just do not need to carry out any other processing, if, opposite they differentiated and be " incorrect ", just the problem that they are remedied is arranged, normally can proofread and correct their convergence errors by magnetic shunt (device in parallel).

The device 15 that is triggered by output 14B can be used to provide first order correcting value, promptly produces local effect with magnetic shunt on screen, generally is each point around screen.Circuit 15 consists essentially of a storing apparatus, and wherein required various fixed points (pointwise) correcting feature is stored according to different correcting action values.Because general wish with the multi-form magnetic shunt of minimal amount and wish that check point is the least possible, correction is always corresponding to the scope that comprises several convergence drift values.

Device 15 also comprises a comparator, and this comparator is at first linked storing apparatus, then links the output 13A of circuit 13, and described comparator provides the characteristic that required fixed point (pointwise) is proofreaied and correct at the output 15A place of device 15.

Similar by the method that device 15 bearing calibrations that provide and skilled operators are used, but get faster, more accurate with device correction of the present invention.(being reflected in a day of operator changes, and concrete condition visual fatigue degree is decided with other factors).

According to the present invention, also can use more accurate bearing calibration.In this case, be that image is totally proofreaied and correct: the inventive system comprises and use the standardized measured value that provides by circuit 12 device 16 with all actual parameters of computational picture.Therefore, it can check visual symmetry whether correct (on/down and a left side/right side) and check tested deflector magnetic field divergence case and the corresponding relation between deserved reference condition.Device 15 is triggered by the output 14B of circuit 14.The output of device 16 is linked on the device 17, device 17 has a tested deflector of this kind pattern in memory ideals assemble parameter and corresponding to ideal parameters with calculate the overall correcting value of the deviation between the gained parameter, these correcting values can obtain at output 18 places.

3 methods of proofreading and correct to the explanation of the examples of accompanying drawing 5 below with reference to accompanying drawings, this example be possible structure simple example.

Get a deflector, this deflector has standardization image (in Fig. 5, solid line is corresponding to " red " electron gun at Fig. 3, and dotted line is corresponding to " indigo plant " electron gun) as shown in Figure 3.If to this deflector fix a point/(pointwise) proofread and correct, must check point 2H and 10H(at the convergence errors e1 at 2H place and 10H place greater than the permissible value of stipulating).These fixed points/(pointwise) proofreaied and correct and undertaken by known method, and as shown in Figure 4, the error e 2 of the image that obtains at 2H and 10H place approximately is half of e1.But, still having bigger defective at 3H～9H place, it need carry out fixed point/(pointwise) of one or many again and proofread and correct.If (Fig. 3) just analyzes the parameter of whole image from the beginning, that just can therefrom derive 3H-9H imbalance or colour contamination mistake, just can determine suitable overall correction after measuring this mistake value.Calculate by known method and to show that after suitably proofreading and correct the colour contamination error, the institute of image has a few all will be in stipulating allowed band.After such " totally " correction, the image that obtains as shown in Figure 5.Proofread and correct then and make magnetic field one-tenth symmetry, resulting image is more than former symmetry.Fixed especially, all become less to the deformation that improves all bigger inner each points of screen quality influence.

The overall bearing calibration of this form can be undertaken by the operator through highly training, but carry out suitably in order to make operation, the operator must carry out tediously long measurements and calculations, these measurements and calculations do not have above-mentioned example simple like that sometimes, for example when all four angles of convergence errors influence image with regard to more complicated, it and requirement of mass production are conflicting.

The method according to this invention, overall correction can cause proofreading and correct simultaneously other mistake.Therefore,, where necessary, just can remove " balance " error, like this, proofread and correct, just can obtain almost perfect symmetry image in conjunction with above-mentioned colour contamination according to the parameter analysis that whole image is carried out.

In other possible example, also can proofread and correct the loosing to error of row or frame field so that the deflector characteristic more approaches the characteristic with reference to product.

The advantage of using machine of the present invention is that it can be used for fast and optimization ground is united and carried out multiple correction to determine minimum and the simplest number of corrections.(overall proofread and correct generally to compare with pointwise correction several times have same or better effect, in addition, pointwise correction in addition can cause error at other point).

Pre-determining by experiment of splitter position realizes that it relates to the physical parameter of deflector and those skilled in the art's knowledge.

Certainly, each installs 12 to 17 and can be replaced by a computer and carry out all functions.

Because transducer 7 has point-device geometric position with respect to the screen of pipe 1, they can determine the absolute coordinates (after this machine is proofreaied and correct with the reference deflector of measuring in advance) of the row of the electron beam on the whole screen.With these coordinate measuring values that records on monochrome image (preferably green image), this machine can be by all parameters of known method computational picture shape, orthogonality for example, east/west and top-bottom pincushion, how much trapezoidal distortions or the like.Then, it also can measure the level and vertical sensitivity of deflector, the visual amplitude that promptly controlled level and vertical scanning electric current are produced.

Claims (7)

1, a kind of deflector to trichromatic cathode tube carries out the method that correcting value was measured and determined automatically to auto convergence, it is characterized in that deflector that each regulates or that regulate in advance is in the same position of the neck that always is placed on the benchmark cathode ray tube aspect machinery and/or the magnetic; On the screen of this pipe, produce criss-cross color-bar test pattern; (preferably 9～25 points) measure the longitudinal axis absolute coordinates of these colour bars with photovoltaic on some points of these colour bars; For the electron beam calculating of two different electron guns and the deviate of coordinate standard value; Resulting value is adjusted with the position that does not mix up of consideration deflector and/or in the convergence errors at tube hub place and/or the deviation between used pipe and the desirable pipe; With by the convergence errors of these adjustment calculation deflectors so that can determine the correcting value of measure error.

2, the method for claim 1, the measurement point that it is characterized in that the cross color-bar test pattern are to be uniformly distributed in the surface of screen and with respect to the vertical and axisymmetric point of level of screen.

3, the method for claim 1 is characterized in that, used pipe is the pipe with complete green screen that three rifles do not have shadow mask.

4, the method for claim 1 is characterized in that the convergence drift of tested deflector is calculated by the standardization measured value.

5, method as claimed in claim 4, the pointwise correction amount that it is characterized in that deflector are to be determined by the convergence drift value of described deflector.

6, method as claimed in claim 4 is characterized in that, the convergence parameter of deflector is that the standardization meeting cluster value by described deflector calculates, and the overall correcting value of described deflector is derived from them.

7, a kind of to the tri-color tube measurement of convergence with automatically determine the machine of the correcting value of deflector be is characterized in that comprising: the measurement bay of support tube; The power supply of pipe and deflection circuit; One pattern generator; The measurement mechanism of the coordinate of one measuring tube screen zones of different; The processing unit of the data that the processing measurement mechanism provides, described processing unit comprises the device of mensuration by the luminous colour bar axis coordinate that pattern generator produced, and this device is connected to coordinate figure is converted to the device of standardized value and the device of a calculating convergence errors; The back of described convergence errors calculation element is connected with the discriminating gear with threshold circuit; Described convergence errors calculation element is linked on the device of decision pointwise correction amount; The described device that coordinate values is converted to standardized value is linked on the device of parameter of the whole image that calculating produces by pattern generator, and described parameter calculation apparatus itself is linked on the device of determining overall correcting value.

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