CN1179678A - Apparatus for and method of measuring focus - Google Patents

Abstract

A correct estimation of a focussed condition of the cathode ray tube can be performed. A predetermined image is displayed at a predetermined position on a screen of a cathode ray tube. A focussing voltage of the cathode ray tube is varied in a condition that a distance from a reference position to a predetermined position in the image is detected. When the changing state of the detected distance is displayed on a predetermined display means (11a), an optical low pass filter is arranged in the optical system such as the incident part of a sensor (15) or the like. From an output of the sensor (15), a condition is determined as the just-focussed condition, the under-focussed condition or the over-focussed condition and the beam spot diameter is calculated from the detected line width. On the basis of the decision of the under-focussed or the over-focussed condition and the calculated value of the beam spot diameter, a focus quantitative value is obtained.

Description

Measure the equipment and the method that focus on

The present invention relates to be used to the equipment and the method for the focusing of the image surveillance receiver measuring television receiver or utilize cathode ray tube.

Utilize the television receiver of cathode ray tube to require to be adjusted to a suitable state, make on cathode ray tube, can show satisfied image before selling after the manufacture process in factory by the focusing of Measurement of Electron Beam.Measure in the method for focusing in the measurement of routine, an operator controls the focusing adjustment amount of video receiver in displayed image on the cathode ray tube of the eye examination that utilizes him at video receiver.But this method of adjustment has inconvenient shortcoming, focuses on the adjustment that the precision of adjusting depends on the operator in the method, because the Direct observation image estimates, so will cause precision inhomogeneous.

In order to overcome this inconvenience, the applicant's past attempts is advised a kind of measurement method of focusing, and the image that shows by sensor in the method is so that can correctly all adjust the shape (number of patent application 4-304032, etc.) of luminous point.

According to this method of measurement, the image that is presented on the display screen of cathode ray tube is designed to be, and is incident on the ccd line sensor by a lens pillar battle array, is used for measuring from the output of ccd line sensor the shape of luminous point.Particularly, for example, as the luminous point of green light as described in Figure 1A by from moving to by the position shown in the solid line, so that show a bright line with wide width by the position shown in the dotted line.Here, represent a position, arranging to have a kind of fluorescent material of green and only luminous on this position on this position by the position that G represents.Therefore, this fluorescent material is luminous by this way, and promptly each position of green fluorescence material is with luminous corresponding to the brightness of the luminous point that is passed through, shown in Figure 1B.

If green fluorescence material issued light is detected by thread detector, provide a photoemissive output that is proportional to this fluorescent material all the time, shown in Fig. 1 C.Because the output of line sensor comprises a noise component(s), from the output of line sensor by by an electronics low pass filter (for example, the filter that forms by electric capacity and resistance) so that obtaining the detection of noiseless component exports, shown in Fig. 1 D.Detect the processing that measures the bright line width the output and be used for the measuring light spot diameter then according to this result's execution from this.By according to the measurement of Figure 1A,, can carry out a kind of not even measurement of any influence that emission changes from light owing to the relation of the position between fluorescent material and the luminous point to the processing of 1D.

But a kind of fluctuation is introduced in the output of line sensor by low pass filter.Wave component L is created in the output of low pass filter, shown in Fig. 1 D.If this wave component is big, this wave component itself can be judged as luminous point output, has therefore disturbed the measurement of bright line width.

In order to eliminate this wave component, what low pass filter can sufficiently be set passes through c to suitable value of frequency f.But, because the scan pattern of the video receiver that the bright line width of cathode ray tube is different owing to screen size or will be measured is different but different, so whenever they not simultaneously, must change the frequency of passing through of low pass filter, brought inconvenience so again, wherein the composition of detector circuit becomes very complicated.

An object of the present invention is to provide a kind of equipment and method that such video receiver focuses on that be used to measure, this equipment and method can provide shirtsleeve operation correctly to carry out and focus on measurement.

The invention provides the equipment and the method for a kind of measurement focusing of shown image on the screen of the video display apparatus with cathode ray tube, wherein shown image is detected and the data that obtain focusing on measurement then from the signal that is detected by line sensor by lens pillar battle array and light low pass filter by a line sensor on the screen of video receiver.Carve at this moment, for the influence that it is difficult to be subjected to color classification (aperture grating, etc.), the width of light beam of image is widened with the focusing of lens pillar battle array is formed screen by skew slightly.Simultaneously, the light low pass filter is arranged in the optical system, such as the incident portion or the similar portions of on-line sensor.

Based on the output of the line sensor that therefore obtains, vertical and horizontal width is displayed on the image of bidimensional or on the similar image.From shown position etc., carry out from focused condition just to the judgement of owing focused condition or crossing focused condition.Simultaneously, the diameter of luminous point is carried out from vertical and horizontal width and calculates and according to owing below the focused condition or crossing the judgement of focused condition and the calculated value of spot diameter, the quantitative values that obtains focusing on.

According to the present invention, because the width of light beam of crosshatch image (bright line width) is widened and on screen the image detected by the lens pillar battle array by line sensor, it focuses on offset slightly and light low pass filter, the light energy that is stored in the line sensor is difficult to influence that is subjected to aperture grating etc., with can detect light beam for a field interval is the shape that how to approach the reality of light beam, and these cause satisfied gathering to be measured again.Have again, according to judgement of owing aggregation conditions or mistake focused condition and calculating spot diameter value, may judicious quantitatively focused condition.

According to the present invention, because the crosshatch image with the bright line of widening width on the screen that is presented at the video display apparatus with cathode ray tube is by by the lens pillar battle array and the light low pass filter of focus bias are measured slightly, therefore the light energy that is stored in line sensor is similar to the true form of light beam, and the image of the demonstration that can have been widened institute's bright line width is carried out satisfied focusing and measured.Simultaneously, because the light low pass filter is set, line sensor can be stored luminous energy under good condition, and then causes with high-precision good measurement, and without any the interference of (aperture grating, etc.) because color classification mechanism.In addition, when utilizing the light low pass filter according to the present invention, passed through an electric low pass filter with the output of line sensor, do not need owing to dimension of picture with change setting with the scan pattern of measured video receiver is different, therefore allow to utilize identical measuring equipment to carry out good measurement continuously.

In this case,, form the light low pass filter, the light low pass filter will be fixed simply by applying the optical receiving surface that the strip-shaped parts with light diffuse scattering function arrives line sensor.

In addition, according to the present invention, because,, therefore can correctly assess focused condition so may judge the condition that each is adjusted quantitatively according to below focused condition or cross the quantitative values that the calculated value of the judgement of focused condition and spot diameter obtains focusing on.

In this case,, finding the focusing quantitative values, considering the adjustment data that obtain from professional and technical personnel's etc. experience, may correctly estimate focused condition by utilize focusing on predetermined being subordinate to of (membership) function of estimation.

Figure 1A is the oscillogram that expression focuses on an example of measuring to 1D;

Fig. 2 is the composition diagram of expression according to one embodiment of the present of invention;

Fig. 3 is the key diagram of expression according to the measuring condition of the screen of this embodiment;

Fig. 4 is the stereogram of expression according to the structure of a kind of transducer of this embodiment;

Fig. 5 is measure during the key diagram of shown image of expression according to present embodiment;

Fig. 6 is the arrangement state of expression according to the transducer of this embodiment;

Fig. 7 is the block diagram of expression according to the structure of the testing circuit of this embodiment;

Fig. 8 A is a timing diagram according to the focusing measuring condition of this embodiment to 8H;

Fig. 9 be expression according to this embodiment the key diagram of an example of demonstration of focused condition;

Figure 10 is the key diagram that is subordinate to (membership) function that expression will be applied to this embodiment;

Figure 11 represents according to this embodiment at a key diagram of measuring the participation item functional value of (crossing the example of focused condition and skew 45 μ m) in the example;

Figure 12 is at a key diagram that is subordinate to (membership) functional value of measuring (examples of not enough focused condition and skew 45 μ m) in the example according to this embodiment;

Now, describe according to embodiments of the invention to Figure 12 with reference to Fig. 2.

Fig. 2 is the figure that the system configuration of measuring equipment of the present invention and method is used in expression.Describe to carry out the processing of measuring, under the situation of this embodiment, focus on that to adjust be to be presented at crosshatch image 14 on the screen of cathode ray tube of television receiver 13 by measurement by the configuration that is illustrated in Fig. 2.In other words, the measuring and controlling 11 that comprises computer installation is controlled the flying-spot video generator 12 that is used to measure, generation is equivalent to the crosshatch signal that is used to focus on adjustment of monoscope signal, this crosshatch signal that is used to focus on adjustment is applied to the screen that television receiver 13 and this crosshatch image 14 are displayed on television receiver 13 as picture intelligence.This crosshatch image 14 for example is a signal as shown in Figure 5, such as in the zone of a vicinity, sensor to be black with two preset widths intersect vertically is presented on the black background with the bright line of level with a kind of predetermined color, other parts are grey.It is variable that the intensity level of ash color part is designed to be, and will be equivalent to the monoscope signal.In addition, vertical and horizontal glow color becomes and designs, and for example is white (or from the green of single fluorescent material glow color etc.).

Under this condition, the ccd line sensor 15 that lens pillar battle array 16 is installed is close on the screen of television receiver 13, is used to detect the vertical and horizontal brightness of shown crosshatch image 14.At this moment, the focusing of each lens of formation lens pillar battle array 16 is by the screen offset slightly from cathode ray tube.Particularly, as shown in Figure 3, lens pillar battle array 16 comprises a plurality of linear column lenticule 16a that arrange and plays the effect that image shown on the screen that makes television receiver 13 incides the optical relay parts on the ccd line sensor 15.Each lenticule 16a is carried out adjustment with respect to the focusing of screen 13a, makes the part that is offset from screen 13a slightly to focus on.

Ccd line sensor 15 comprises the linear optical receiver of arranging and reads the signal charge that is stored in each optical receiver and provide these electric charges to beam sizes measuring unit 30 as detection signal.Wherein in this example, as shown in Figure 4, a light diffuse scattering band 21 is applied on the ccd line sensor 15, so that cover its overall optical receiver 15a.Light diffuse scattering band 21 is to utilize a kind of translucent adhesive tape (for example, a kind of belt of selling with trade names such as mending tapes) that is called as hereto.Utilization is arranged light diffuse scattering band 21 in the front of optical receiver 15a, forms the light low pass filter, and this filter is incided optical receiver 15a by the component and the remaining light of the higher range of the light that sends from lens pillar battle array 16.

In addition, replace light diffuse scattering band 21, can arrange other to play the material of light low pass filter effect.Have again, can be arranged to from screen 13a to ccd line sensor any position of 15 optical receiver 15a light path.

Beam sizes measuring unit 30 is measured the horizontal width H from the vertical line in Fig. 6 of the detection signal of line sensor 15 _WWith horizontal vertical width V _WIn this case, measure to handle and to be carried out by this way, the transducer output that is fed to beam sizes measuring unit 30 from ccd line sensor 15 by with a reference level comparison and then width from measuring H above the width signal of reference level _WAnd V _W

Remove these width H _WAnd V _WOutward, the position H at the edge from the reference position to the vertical line _LWith from the reference position to the position V at horizontal edge _LAlso measured.These positions H _LAnd V _LBe to determine in the following manner.When width H _WAnd V _WTo from vertical and horizontal broadband, detected timing be carried out estimation.Then, the precalculated position from ccd line sensor 15 to vertical and horizontal line edge separately is respectively as position H _LAnd V _LBe determined (end position in this case).

Particularly, as shown in Figure 6, carry out to measure by this way, promptly ccd line sensor 15 lens pillar battle arrays 16 are placed on respect to the vertical of crosshatch image 14 and position that horizontal brightness tilts, that is, with the vertical condition that intersects with horizontal brightness.Under this condition, when the output signal of ccd line sensor 15 surpasses reference value, width H _WAnd V _WFrom corresponding signal, detected and utilize to be detected then an end parts 15a from ccd line sensor 15 to width H _WAnd V _WThe distance detecting position H of respective edges _LAnd V _L

Here, in beam sizes measuring unit 30, be used for detection width H according to embodiment _WAnd V _WAnd position H _LAnd V _LStructure be described with reference to the timing diagram of Fig. 7 of the block diagram of Fig. 7 and its operation of explanation.In addition, at Fig. 8 A, 8B, 8C, 8D, 8E, 8F, 8H corresponding to the signal that shifts by the holding wire of representing by reference symbol a, b, c, d, e, f, g and h respectively.

Beginning, one read commencing signal (Fig. 8 A) by the end 31 from measuring unit 30 sides be fed to ccd line sensor 15 and simultaneously a transmission clock signal (Fig. 8 B) be fed to ccd line sensor 15 by end 32 from measuring unit 30 sides.The output of transducer (Fig. 8 C) is to read the moment that commencing signal is fed to ccd line sensor 15 from working as, with with the read output signal of the ccd line sensor 15 of the speed of transmission clock signal synchronised and then the output of transducer be fed to the anode of comparator 33 inputs in the measuring unit 30.The negative terminal of comparator 33 inputs is connected to reference voltage source 34.Therefore, the transducer output of reference level that is higher than the voltage of this reference voltage source is taken as the output of comparator 33, as the detection output of bridge line.That is, shown in Fig. 8 D, when the bridge line is detected, rise to high level and when the bridge line is not detected, drop to a low level pulse from comparator 33 outputs.

The output of comparator 33 is fed to vertical/horizontal splitter circuit 35 then.This vertical/horizontal splitter circuit 35 receives as reset pulse at reset terminal R and reads commencing signal (Fig. 8 A) and be fed to Q then after this reset pulse is fed ₁First pulse that one of output receives at pulse input end C and be fed to Q ₂Second pulse that receives at pulse input end C of output.The Q of vertical/horizontal splitter circuit 35 ₁Output detects pulse (Fig. 8 E) as vertical width and is fed to and a door input of 36.This with door 36 another input from hold 32 receive the transmission clock signals and so only when vertical width detects pulse and rises clock signal exported from being connected to the end 51 of door 36.A counter (not shown) that is connected to this end 51 count this clock signal output and therefore this count value corresponding to the vertical width of measuring.

The Q of vertical/horizontal splitter circuit 35 ₂Output detects pulse (Fig. 8 F) as horizontal width and is fed to and a door input of 37.This with door 37 another input from hold 32 also receive the transmission clock signal and so only the clock signal when horizontal width detects pulse and rises exported from being connected to the end 52 of door 37.A counter (not shown) that is connected to this end 52 count this clock signal output and therefore this count value corresponding to the horizontal width of measuring.

The Q of vertical/horizontal splitter circuit 35 ₁Output also is fed to upright position detector circuit 38.This circuit 38 receives as reset pulse and after reset terminal R reception is read commencing signal (Fig. 8 A) and received this reset pulse then its Q output is risen.The reverse Q output that utilizes upright position detector circuit 38, obtains a upright position and detects pulse shown in Fig. 8 G by a reverse swing door 39, and its duration from the rise time of reading commencing signal is extended to the rise time that vertical width detects pulse.This upright position detection pulse is fed to an input with door 40.This also only when upright position detect the rising of pulse from be connected to the end 53 of door 40 exports this clock signals in its another input reception from 32 transmission clock pulse with door 40.Be connected to end 53 counter (not shown) counting clock signal and its value of counting corresponding to the upright position of measuring.

In addition, the Q of vertical/horizontal splitter circuit 35 ₂Output is fed to horizontal position detector circuit 41.This circuit 41 is received in the reading commencing signal (Fig. 8 A) and receiving the Q output rising that makes it behind the reset pulse when the pulse of the pulse input end C that is fed to it is risen then as reset pulse on the reset terminal R.Utilize Q output, shown in Fig. 8 H, obtain its duration to detect the horizontal level detection pulse of the rise time of pulse to horizontal width from the rise time of reading commencing signal by reverse swing door 42 reverse horizontal position detector circuit 39.This horizontal width detection pulse is fed to an input with door 43.This with door 43 another input from hold 32 receive the transfering clock pulses and then only when horizontal level detects pulse and rises from being connected to and 43 end 54 clock signals.Be connected to end 54 counter (not shown) counting clock signal and its value of counting corresponding to the horizontal level of measuring.

The vertical width H that utilizes the counter in beam sizes measuring unit 30 to detect in this way _WWith horizontal width V _WAnd upright position H _LWith regard to horizontal level V _LBe sent to measuring and controlling 11.In addition, the transmission clock signal that is fed to ccd line sensor 15 from beam sizes measuring unit 30 is the clock signal that produces according to the synchronizing signal that receives from the flying-spot video generator 12 that is used to measure, and therefore can make the visual synchronised on the image that will be read by ccd line sensor 15 and the screen that is presented at television receiver 13.

As estimation vertical width H _WWith horizontal width V _WAnd upright position H _LWith regard to horizontal level V _LWhen the data that are transmitted were indicated, measuring and controlling 11 drove a stepper motor 19 and changes the condition that focuses on.Particularly, a most advanced and sophisticated automatics of inserting of measuring and controlling 11 controls 18 automatic fixing on the end of stepper motor 19 tips are inserted into the focus adjustment means 20 of television receiver 13, so that drive and control focusing adjustment amount device 20 by the rotation of stepper motor 19.Relate at this moment the driving/control of carving, focus on adjustment amount device 20 and be driven, for example this focusing adjustment amount device can be rotated whole angular range and then measuring and controlling 11 be stored in the H in this moment _W, V _W, H _LAnd V _LEach data respective change.

Measuring and controlling 11 shows H at the display unit 11a that is connected on the measuring and controlling 11 _W, V _W, H _LAnd V _LEach data change state.Fig. 9 is illustrated in an example that shows in this case, wherein upright position H _LWith horizontal level V _LThe figure that is used as horizontal/vertical positions 100 shows and vertical width H _WWith horizontal width V _WBeing used as beam area Figure 110 shows.

This situation shape, the figure vertical axis of horizontal/vertical positions 100 is represented the detected state of upright position and the detected state that trunnion axis is represented horizontal level.In the variable condition that comprises each position of indication on the vertical and trunnion axis of quadrature.The curve 101 that is illustrated in horizontal/vertical positions Figure 100 is the change curves that obtain by the rotation that changes focusing adjustment amount device 20.Generally, upright position H _LAdjust the position at some and have maximum, and horizontal level V _LAdjust the position at some and have minimum value.This position such as smallest point 102 are represented and are represented by a sign (being a black circle here) that shows.This smallest point 102 constitutes representative and owes the characteristic curve 103 of focused condition and represented a border between the characteristic curve 104 of focused condition.For the current position of rotation of adjustment amount device 20, show (being a circle) here along the detection position such as the current point 105 of change curve 101.

Beam area tolerance 110 shows vertical and horizontal width H _WAnd V _WThe detection data, as beam area by in measuring and controlling 11, taking advantage of these data to obtain.The left end of tolerance 110 is represented as smallest point 111 and right-hand member is expressed as maximum point 112.Beam area for the current adjustment position of adjustment amount device 20 is shown as current point 113 with a kind of pattern between smallest point 111 and maximum point 112.

By showing the focused condition of measuring by this way, may correctly be estimated as the variation of cathode ray tube beams focusing state of the television receiver 13 of an equipment to be tested, in other words, by observing current point 105 along change curve 101 as the figure of horizontal/vertical positions 100, may easily determine whether when the condition of prefocusing owe to focus on or focusing.

Have again, in this example, based on according to focused condition and the vertical width H from detected bright line width _WWith from horizontal width V _WData in find on the basis that spot diameter shows, in measuring and controlling 11, carry out and ask the processing that focuses on quantitative values, so that on the screen of the display 11a that is connected to measuring and controlling 11, show the focusing quantitative values that finds.Here, spot diameter is to utilize vertical width H _WWith from horizontal width V _WObtain from following formula.

To focus on that quantitative values and estimation owe to focus on still was focused condition in order to ask from the spot diameter that calculates, utilize a kind of be used to estimate be subordinate to (membership) function.These data that are used for focusing on the membership function of estimation are stored in measuring and controlling 11 in advance.Figure 10 represents to be utilized an example of membership function that is used to focus on estimation in the present embodiment.The membership function that is used to focus on estimation in the following manner and be established.Many technical staff at focusing adjustment career field once carried out the focusing adjustment of standard cathode ray tube.Adjusting operating period, 1. well three, 2. bad, 3. poor regularization conditions are set up, so that the scope separately that allows will be determined by experience, wherein, relate to the good, bad of spot diameter and difference regularization condition three steps scope the adjustment period between may estimate from corresponding focus voltage etc.

In Figure 10, trunnion axis representative is poor from the minimum value of spot diameter.By the position representative of 0 μ m indication at focal position (being the smallest point 102 in the corresponding diagram 9) spot diameter just.Represented focused condition from the left side of this position, and owed focused condition from the right side representative of this position.The vertical axis representative will be used to ask a fit value that focuses on quantitative values.

Next, with reference to Figure 11 and Figure 12 the processing that utilizes the membership function that focuses on estimation to ask the focusing quantitative values will be described.Focus on quantitative values in this example and be the value that changes in from+100 to-100 the scope.As asking a supposition that focuses on quantitative values, 0 calculated value be set for the well focussed regularization condition ,+50 calculated values be set for cross under the focused condition bad focused condition and+100 calculated value is set for poor focusing regularization condition.Calculated value in addition ,-50 is set at bad focusing regularization condition and-100 the calculated value owed under the focused condition and is set for poor focusing regularization condition.

At first, with describe when the spot diameter of measuring be to be offset crossing of 45 μ m from focused condition just to ask the example that focuses on quantitative values under the focused condition.In the participation item function of Figure 10, for crossing focused condition (in Figure 10, the represented position of bent X dotted line) direction is offset the position of 45 μ m, the adaptive value of well focussed regularization condition be 0.5 and the adaptive value of bad at the same time focusing regularization condition be 0.5.Therefore, as shown in figure 11, the fit value that one 0.5 adaptive value is stored in the position of 0 value and 0.5 is stored in+position of 50 values.Next, ask the processing of the center of gravity of these adaptive values.In other words, this center of gravity is will be the focusing quantitative values of crossing focused condition that is offset 45 μ m from focused condition just by that obtain and the center-of-gravity value that be determined of the calculating of following formula.

(+50×0.5)+(0×0.5)/(0.5+0.5)＝+25…(2)

From this expression formula, for from the focusing quantitative values of crossing focused condition that just focuses on focus bias 45 μ m will for+25 and this+25 focusing quantitative values is displayed on screen 11a as quantitatively indicating.

Secondly, with describe when the spot diameter of measuring be from focused condition just be offset 45 μ m owe ask the example that focuses on quantitative values under the focused condition.In the membership function of Figure 10, for owing focus direction (in Figure 10, the position of representing by dotted line Y) position of skew 45 μ m owe focused condition, the adaptive value of this bad focusing regularization condition be 0.2 and the adaptive value of poor at the same time focusing regularization condition be 0.8.Therefore, as shown in figure 12, position and value 0.8 that adaptive value 0.2 is positioned at value-50 are positioned at-100 position.Next, seek the processing of the center of gravity of these adaptive values.In other words, this center of gravity is will be the focusing quantitative values of owing focused condition that is offset 45 μ m from focused condition just by that obtain and the center-of-gravity value that be determined of the calculating of following formula.

(-0.5×0.2)+(-100×0.8)/(0.2+0.8)＝-90 …(3)

From this expression formula, for from the focusing quantitative values of owing focused condition that just focuses on focus bias 45 μ m will for-90 and this focusing quantitative values of-90 be displayed on screen 11a as quantitatively indication.

By showing the focusing quantitative values of the quantitative indication of finding by this way of conduct, may estimate current focusing regularization condition quantitatively.In other words, when the focusing quantitative values was 0, just obtaining, focused condition was to obtain according to the value of approaching+100 with this condition, with on the direction of overbunching condition and approaching-100 o'clock on duty, aggregation conditions is variation gradually, is owing on the direction of aggregation conditions, and aggregation conditions is variation gradually.Therefore, when only estimating by spot diameter, in the direction of overbunching condition with owing to exist big difference between the direction of aggregation conditions, even under common situation with identical value, but, may estimate focused condition quantitatively when by using the focusing quantitative values of obtaining according to the membership function of this example.

In the above-described embodiments, when explanation is carried out the processing of one-shot measurement by means of the image on the precalculated position that is presented at cathode ray tube, this image that is used to measure (in the above-described embodiments, the crosshatch image) can be displayed on a plurality of positions of screen, so that on a plurality of positions, measure focused condition, therefore consider the balance execution adjustment of whole screen, reach a kind of suitable focused condition from the overall point of view.In this case, for example, can believe and adjust, make total focusing quantitative values can fall within the minimum value of whole screen.

And then, in this embodiment, when carrying out adjustment by the focusing adjustment amount device 20 of rotating television receiver 13, if will controlled television receiver comprising the memory that is used for storing the focus control value and focus control is to carry out being stored in the control data that this memory stores, then the control data of this memory only needs to write according to the data of measuring, so that the composition of adjusting can be done simplerly.

Have again, in this embodiment, when the focusing of the cathode ray tube of carrying out television receiver is measured, during the focusing that the present invention certainly is applied to other image display apparatus with cathode ray tube is measured (for example being used for the display of computer etc.).

Be described for a preferred embodiment of the present invention with reference to accompanying drawing, but should be understood to, the invention is not restricted to the embodiments described, with for the professional and technical personnel, not breaking away under the spirit or scope of the present invention that limits according to appending claims, can make various changes and modification.

Claims (13)

1. measuring equipment measurement with lens pillar battle array, light low pass filter and line sensor of a utilization is presented at the focusing method of measurement of image on the screen of the video display devices with cathode ray tube, may further comprise the steps:

Utilize described line sensor to detect image on the screen that is presented at video display apparatus with described cathode ray tube by described lens pillar battle array and described smooth low pass filter; With

Obtain focusing on measurement data by the signal that detects by described line sensor.

2. according to the focusing method of measurement of claim 1, wherein use to have to be presented at image on the described screen of video display apparatus with cathode ray tube in the focusing adjustment image conduct that vertical and horizontal direction are widened the bright line of width.

3. according to the focusing method of measurement of claim 1, wherein said lens pillar battle array is arranged to the column micro lens by linearity and constitutes.

4. according to the focusing method of measurement of claim 1, the image that wherein is presented on the described screen of the video display apparatus with cathode ray tube detects from the focusing that the described screen of video display apparatus is configured each lens offset slightly of described lens pillar battle array.

5. according to the focusing method of measurement of claim 1, wherein said smooth low pass filter be bonded in described line sensor optical receiving surface strip-shaped parts and have the light dispersion function.

6. according to the focusing method of measurement of claim 1, wherein said smooth low pass filter is configured in described screen from the video display apparatus with cathode ray tube to the light path of described line sensor.

7. a measurement is presented at the focusing method of measurement of the image on the screen of the video display apparatus with cathode ray tube, may further comprise the steps:

Utilize line sensor to pass through lens pillar battle array and light low pass filter, detection is presented at the focusing with having on the described screen of the video display apparatus of the bright line of width broadening on vertical and the horizontal direction with cathode ray tube and adjusts image;

According to the diameter of the width calculating luminous point of the vertical and horizontal brightness that is detected by described line sensor, the condition that determines whether described luminous point is with respect to focused condition just, owe focused condition or focused condition;

When definite condition is when owing focused condition, the Diameter Calculation value that the function that utilizes preparation to be used to owe focused condition calculates described luminous point obtains focusing on quantitative values; With

When definite condition was focused condition, the Diameter Calculation value that the function that utilizes preparation to be used for focused condition calculates described luminous point obtained focusing on quantitative values.

8. according to the focusing method of measurement of claim 7, wherein have cathode ray tube and controlled video display apparatus comprised be used for storing the memory of focus control value and when carrying out focus control, utilize the control data that is stored in the described memory to replace measurement data to focus on adjustment according to the control data that is stored in described memory.

9. according to the focusing method of measurement of claim 7, wherein said lens pillar battle array is that the column micro lens by the linearity arrangement constitutes.

10. according to the focusing method of measurement of claim 7, wherein have width broadening on vertical and the horizontal direction the focusing adjustment image with on the described screen that is presented at video display apparatus of bright line with cathode ray tube detect from the focusing that the described screen of this video display apparatus is configured the offset slightly of described each lens of lens pillar battle array.

11. according to the focusing method of measurement of claim 7, wherein said smooth low pass filter be bonded in described line sensor optical receiving surface strip-shaped parts and have a light dispersion function.

12. according to the focusing method of measurement of claim 7, wherein said smooth low pass filter is configured in described screen from the video display apparatus with cathode ray tube to the light path of described line sensor.

13. according to the focusing method of measurement of claim 7, wherein utilize a predetermined focusing to estimate membership function, therefore according to determine whether this condition owe focused condition or focused condition, obtain focusing on quantitative values from the Diameter Calculation value of described luminous point.

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