CN100552464C - Conductive pattern check-up apparatus - Google Patents
Conductive pattern check-up apparatus Download PDFInfo
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- CN100552464C CN100552464C CNB2004100691699A CN200410069169A CN100552464C CN 100552464 C CN100552464 C CN 100552464C CN B2004100691699 A CNB2004100691699 A CN B2004100691699A CN 200410069169 A CN200410069169 A CN 200410069169A CN 100552464 C CN100552464 C CN 100552464C
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
- G01R31/281—Specific types of tests or tests for a specific type of fault, e.g. thermal mapping, shorts testing
- G01R31/2812—Checking for open circuits or shorts, e.g. solder bridges; Testing conductivity, resistivity or impedance
Abstract
The invention provides a kind of conductive pattern check-up apparatus, can simplyr carry out the inspection of the state of the high conductive pattern of reliability.Conductive pattern check-up apparatus (10) have with the sensor electrode (18) of an end electrostatic coupling of checking object pattern (14) and with the feed electrode (16) of the other end electrostatic coupling of whole conductive patterns (14).And, apply AC signal through feed electrode (16) and sensor electrode (18) to the object pattern, and detect the current value that between power supply (20) and sensor electrode (18), flows through.Detect according to detected current value and to have or not opening circuit and short circuit of conductive pattern.
Description
Technical field
The present invention relates to check the conductive pattern check-up apparatus of the state of the conductive pattern that on substrate, forms.
Background technology
As the method for the state of checking the conductive pattern (conductive pattern) that on substrate, forms, in the prior art, the known method that makes contact probe (pin probe) contact conductive pattern two ends.It flows through electric current and passes through another contact probe in detecting magnitude of voltage in a contact probe.And, by from the value that is detected, obtaining the resistance value of conductive pattern, and detect opening circuit (disconnection) and short circuit (short) of conductive pattern.
But, in this method, have contact conductive pattern damage that causes and the problem that must replace the contact probe according to the spacing of conductive pattern because of the contact probe.
Therefore, the circuit pattern inspection device of the state of noncontact inspection conductive pattern is disclosed in the Japanese Patent Application Publication 2002-365325 communique.It is from giving conductive pattern with the feed electrode of an end electrostatic capacitance of conductive pattern coupling (electrostatic capacitory coupling) with the AC signal feed.And two kinds of sensor electrodes that are coupled to the other end of conductive pattern by electrostatic capacitance detect this signal, and check the state of conductive pattern according to detected signal.
Thus, owing to can check non-contactly, thus can pattern of lesions, do not need to replace probe according to spacing.
But in this testing fixture, the signal of formation feed to conductive pattern, flows to the current path on ground from the feed electrode from conductive pattern.Therefore, the magnitude of voltage of being responded on the conductive pattern is very little, is easy to be subjected to the influence of noise.Therefore, can not carry out the high inspection of reliability.In addition, needs are supplied with high-tension signal, and the countermeasure of needs discharge etc.
Summary of the invention
Therefore, the purpose of this invention is to provide a kind of conductive pattern check-up apparatus that can carry out the high inspection of reliability more simply.
According to conductive pattern check-up apparatus of the present invention, check the state of a plurality of conductive patterns that on substrate, dispose, it is characterized in that, comprising: sensor electrode, with an end electrostatic coupling of checking the object pattern; The feed electrode is electrically connected with the other end that comprises the plural at least continuous conduction pattern of checking the object pattern; The signal applying unit applies AC signal through feed electrode and sensor electrode to the object pattern; The current value detecting unit detects the current value that flows through between the power supply of signal applying unit and sensor electrode or feed electrode; Defect detection unit according to detected current value, detects and has or not opening circuit or short circuit of conductive pattern.
According to another conductive pattern check-up apparatus of the present invention, the state of a plurality of conductive patterns that inspection is disposed on substrate, it is characterized in that, comprising: a pair of first electrode is electrically connected with the two ends of the conductive pattern more than three of the conductive pattern that comprises object pattern and its both sides at least; A pair of second electrode is the pair of electrodes on the conductive pattern of the both sides that are configured in the object pattern, and respectively electrostatic coupling to the conductive pattern of both sides; First applying unit imposes on conductive pattern through a pair of first electrode with the AC signal of first frequency; Second applying unit imposes on conductive pattern through a pair of second electrode with the AC signal of second frequency; Sensor electrode, for being arranged on the electrode on the object pattern, and electrostatic coupling is to the object pattern; Voltage detection unit detects the magnitude of voltage of each frequency of sensor electrode; Defect detection unit detects to have or not according to detected magnitude of voltage and opens circuit and short circuit.
According to other conductive pattern check-up apparatus of the present invention, inspection is pressed the configuration of row shape and is connected a plurality of Cs patterns of one end and press a plurality of gate patterns of row shape configuration each other alternately with the Cs pattern with public by Cs on substrate, it is characterized in that, comprise: the Cs electrode, with at least more than one the other end electrostatic coupling of Cs pattern that comprises object Cs pattern; The Cs applying unit imposes on object Cs pattern with electrode with the AC signal of first frequency with public and Cs through Cs; A pair of grid electrode is electrically connected with at least more than one the two ends of gate pattern that comprise adjacent to the object gate pattern of object Cs pattern; The grid applying unit imposes on object gate pattern with electrode with the AC signal of second frequency through a pair of grid; Sensor electrode is with object Cs pattern or object gate pattern electrostatic coupling; The magnitude of voltage detecting unit detects the magnitude of voltage of each frequency of sensor electrode; Defect detection unit detects the defective of Cs pattern and gate pattern according to detected magnitude of voltage.
According to another conductive pattern check-up apparatus of the present invention, inspection is pressed the configuration of row shape and is connected a plurality of Cs patterns of one end and press a plurality of gate patterns of row shape configuration each other alternately with the Cs pattern with public by Cs on substrate, it is characterized in that, comprise: the Cs electrode, with at least more than one the other end electrostatic coupling of Cs pattern that comprises object Cs pattern; The Cs applying unit imposes on object Cs pattern with electrode with AC signal with Cs with public through Cs; A pair of grid electrode is electrically connected with at least more than one the two ends of gate pattern that comprise adjacent to the object gate pattern of object Cs pattern; The grid applying unit imposes on object gate pattern with electrode with AC signal through a pair of grid; Sensor electrode with object Cs pattern or object gate pattern electrostatic coupling, links to each other with the power supply of grid with applying unit with applying unit with Cs; The current value detecting unit detects the current value between power supply and the sensor electrode; The current value detecting unit detects the short circuit and the broken string of Cs pattern and gate pattern according to detected current value.
In addition, here,,, also can be other substrates if dispose the substrate of a plurality of conductive patterns by the row shape though substrate preferably is used for the glass substrate of display panels etc.In addition, conductive pattern comprises the conductive pattern that is called gate pattern (gate pattern), Cs pattern, data pattern (datapattern) etc.
According to the present invention, uprise to the rate that applies of the AC signal of conductive pattern, even the AC signal of low-voltage also can be carried out the high inspection of reliability.Therefore, can carry out the inspection of reliability height more simply.
According to other the present invention, improve to the rate that applies of the AC signal of gate pattern and Cs pattern, so, also can carry out the high inspection of reliability even be the AC signal of low-voltage.Therefore, can simplyr carry out the inspection of high gate pattern of reliability and Cs pattern.
Description of drawings
Fig. 1 is the summary lateral view as the inspection apparatus for pattern of embodiments of the invention;
Fig. 2 is the approximate vertical view as the inspection apparatus for pattern of embodiments of the invention;
Fig. 3 illustrates the figure that off position detects principle;
Fig. 4 illustrates the figure that location of short circuit detects principle;
Fig. 5 is the approximate vertical view as the inspection apparatus for pattern of other embodiment;
Fig. 6 is the approximate vertical view as the inspection apparatus for pattern of other embodiment;
Fig. 7 illustrates the figure that off position detects principle;
Fig. 8 illustrates the figure that location of short circuit detects principle;
Fig. 9 is the approximate vertical view as the inspection apparatus for pattern of other embodiment;
Figure 10 illustrates the figure that location of short circuit detects principle;
Figure 11 illustrates the figure that off position detects principle;
Figure 12 is the approximate vertical view as the inspection apparatus for pattern of other embodiment;
Figure 13 is the approximate vertical view as the inspection apparatus for pattern of other embodiment.
Symbol description: 10 inspection apparatus for pattern; 14 conductive patterns; 16 feed electrodes; 18,36,62 sensor electrodes; 20,40,42,64,66 power supplys; 22 current detectors; 30 public; 32 first electrodes; 34 second electrodes; 44 magnitude of voltage detecting devices; 50 gate patterns; The 52Cs pattern; 56 grid electrodes; The 60Cs electrode; 82 extraction electrodes.
Embodiment
Below, with reference to the description of drawings embodiments of the invention.Below explanation in, the conductive pattern that especially will be used for disposing on the glass substrate of display panels etc. is as checking object.But, be not limited to this, if having row shape conductive pattern independent of each other, can other conductive patterns be object also.
Fig. 1 represents the summary lateral view as the inspection apparatus for pattern 10 of embodiments of the invention; Fig. 2 represents approximate vertical view.
This device 10 is checked the state of the conductive pattern 14 of configuration on the glass substrate 12.Glass substrate 12 is fixed on the base station 24 by the absorbing unit that does not illustrate among the figure.Dispose a plurality of conductive patterns 14 at glass substrate 12 above-listed shapes.This conductive pattern 14 is independently of one another under normal condition, and does not contact with adjacent conductive pattern 14.In addition, roughly equidistantly configuration, the position at its two ends is roughly the same.But,, also can wait corresponding by the size of adjusting two kinds of electrodes even have the glass substrate of the conductive pattern of unequal-interval and unequal length.
Predetermined space is provided with two kinds of electrodes 16,18 at interval above glass substrate 12.Feed electrode 16 is positioned the conductive sheet of the end top of conductive pattern 14 when being inspection.It has the width that covers whole patterns end, and with the end electrostatic coupling (capacitive coupling) of whole conductive patterns 14.But feed electrode 16 (electric supplyelectrode) also can be other width if cover the width of the end of two above patterns.At this moment, can cooperate sensor electrode 18 described later to the moving of Y direction, feed electrode 16 also moves.
Here, recently cut apart the voltage that imposes on conductive pattern 14 by 16,18 pairs of electrostatic capacitances that conductive pattern 14 has of two electrodes.Because the electrostatic capacitance that a pattern sensor electrode 18 and feed electrode 16 are had about equally, so the voltage that conductive pattern 14 has is about 1/2nd of the alternating voltage that applied.Therefore, can efficiently apply voltage, the voltage of signals of being exported by power supply 20 can be several tens volts of such low-voltages that lie prostrate.
The current detector 22 that detects current value is set between power supply 20 and sensor electrode 18.To deliver to control device by these current detector 22 detected current values, and store with the positional information of sensor electrode 18.For example can use transformer in the current detector 22, can by adjust around coil turn adjust detection sensitivity.In addition, also can detect the voltage drop of resistance by differential amplifier.
Then, the conductive pattern that this inspection apparatus for pattern 10 is described is checked principle.Checking that conductive pattern 14 has under the zero defect situation of (opening circuit and short circuit), sensor electrode 18 is being positioned to check the end top of object conductive pattern 14 feed electrode 16 is positioned at other end top, and from power supply 20 output AC signals.The AC signal of being exported imposes on conductive pattern 14 through sensor electrode 18 and feed electrode 16.
At conductive pattern 14 is not open circuit and during the normal pattern of short circuit, form the closed circuit that comprises conductive pattern 14.Therefore, on conductive pattern 14, flow through electric current corresponding to the predetermined value (greater than 0) of the resistance in voltage of signals that is applied and the circuit.Detect this current value by current detector 22.
On the other hand, under the situation of the pattern 14a that opens circuit that the A that opens circuit is arranged, do not flow through electric current.Therefore, current detector 22 detects and is roughly 0 current value.In addition, under the situation of the short circuit pattern 14b that short circuit B is arranged, whole resistance value reduces, and detects the electric current higher than normal conductive pattern 14.
Therefore, move to the direction parallel (the Y direction of Fig. 2), and obtain the current value shown in the right side of Fig. 2 with pattern by making sensor electrode 18.That is, when sensor electrode 18 is positioned on the normal conductive pattern 14, detect the current value of predetermined value, when it is positioned on the pattern 14a that opens circuit, detects and be roughly 0 current value, when it is positioned on the short circuit pattern 14b, detect the current value higher than predetermined value.
The positional information of this current value and sensor electrode 18 is delivered to control device, in control device, come the specific conductive pattern that short circuit is arranged and open circuit according to these information.Promptly, can detect and detect when being roughly 0 current value, to detect with the conductive pattern of sensor electrode 18 electrostatic coupling and be the pattern that opens circuit, it is the short circuit pattern that the conductive pattern of sensor electrode 18 electrostatic coupling during with the current value that detects more than the predetermined value detects.
At this moment, as mentioned above, because two ends apply AC signal through roughly the same electrostatic capacitance to conductive pattern 14, so also can detect high current value even applied the signal of low-voltage.Therefore, be difficult to be subjected to the influence of noise, even also can carry out high-precision inspection for low-voltage.In addition, owing to be low-voltage,, can simply check so do not need the countermeasure etc. of discharging.Further, can be only have or not simultaneously and open circuit and the inspection of short circuit by mobile primary transducer electrode 18 on the direction parallel with conductive pattern 14.
The principle of the position of detecting defective then, is described with Fig. 3, Fig. 4.Fig. 3 is the figure that the expression off position detects principle, and Fig. 4 is the figure that the expression location of short circuit detects principle.Represent by current detector 22 detected current values at the downside of figure respectively.
Under the situation that detects off position or location of short circuit, along opening circuit pattern 14a or short circuit pattern 14b movable sensor electrode 18.
Along under the situation of pattern 14a movable sensor electrode 18 of opening circuit, detect the current value shown in the downside of Fig. 3.That is, before sensor current 18 is in the A that opens circuit (among the figure left side) during owing to do not flow through electric current, be roughly 0 value so detect.And,, detect the current value of predetermined value in the moment of sensor electrode 18 above off position.And, if near feed electrode 16 sides, because the reduction of whole resistance value, so current value raises.The positional information of this current value and sensor electrode 18 is delivered to control device, in control device, detect off position according to these information.That is, current value is detected as off position from being roughly 0 the position of sensor electrode 18 when being changed to predetermined value.
On the other hand, along under the situation of short circuit pattern 14b movable sensor electrode 18, detect the current value shown in the downside of Fig. 4.That is, before sensor electrode 18 is in short circuit B during, current value increases steadily, the moment that surpasses short circuit B for roughly certain.And, if sensor electrode 18 further near feed electrode 16 sides, restarts slow increase.The position of the sensor electrode 18 when steadily being increased to certain change point in the control device is detected as location of short circuit.
Like this,, detect current value at this moment by along defective conductive pattern movable sensor electrode, but and specific defects position.
In addition, in the present embodiment, though movable sensor electrode 18, also removable glass substrate 12.In addition, also can whole patterns have or not defect inspection to stop after carry out the detection of defective locations, also can when detecting defect pattern, carry out at every turn.
[embodiment 2]
Then, the situation that public (common bar) used as the feed electrode is described.
Usually, in the conductive pattern 14,, connect an end of whole conductive patterns by the conductive sheet that is called as public for the damage of the conductive pattern that prevents to produce because of static.Under the situation that is this glass substrate, also can be with this public as the feed electrode.
Concrete, as shown in Figure 5, apply AC signal to conductive pattern 14 through sensor electrode 18 and public 30.At this moment, to public 30 feed for example, also can use the contact type probe of single contact etc.Since public 30 with an end of whole patterns physically, electrically be connected, so have and the same effect of above-mentioned feed electrode.
Therefore, under the situation that sensor electrode 18 is moved along the Y direction, be shown in the right side of Fig. 5 by current detector 22 detected current values.That is, on the pattern 14a that opens circuit, detect and be roughly 0 current value, on short circuit pattern 14b, detect the current value bigger than predetermined value.In addition, under the situation of the position that detects open circuit A or short circuit B, also can be along defective conductive pattern movable sensor electrode 18.
Like this, by with public 30 as the feed electrode, can more easily carry out the pattern inspection.In addition, owing to the feed that can carry out more reliably, so can carry out more accurate inspection to conductive pattern 14.
[embodiment 3]
Then, other embodiment are described.
Fig. 6 is the approximate vertical view as the inspection apparatus for pattern 10 of other embodiment.In this inspection apparatus for pattern 10,, use a pair of first electrode 32 and a pair of second electrode 34 that is arranged on the both sides pattern of checking the object pattern that are arranged on pattern ends as the feed electrode.In addition, carry out defect inspection according to being arranged on the magnitude of voltage of checking the sensor electrode 36 on the object pattern.
A pair of first electrode 32 is positioned the conductive sheet of the top, two ends of conductive pattern 14 when being inspection, have the function of the feed electrode of using as testing for continuity.First electrode 32 has the width of the end that covers whole patterns, with the end electrostatic coupling of whole conductive patterns 14.But,, also can be other width if first electrode 32 covers the width of three above pattern ends that comprise the conductive pattern of checking object pattern and its both sides.At this moment, also can cooperate sensor electrode 36 described later to move to the Y direction, first electrode 32 also moves.
A pair of second electrode 34 is the conductive sheet that is positioned to check above the both sides pattern of object pattern when checking, has the function of the feed electrode of using as test for short-circuit.Second electrode 34 roughly has the width identical with 1 pattern, with both sides conductive pattern 14 electrostatic coupling of checking the object pattern.This second electrode 34 also can cooperate moving of sensor electrode 36 described later, and moves.
First frequency f1 that first power supply 40 is different with second source 42 generated frequencies and the AC signal of second frequency f2 and export.The two ends of first power supply 40 are connected to a pair of first electrode 32, the two ends of second source 42 are connected to a pair of second electrode 34.Therefore, impose on conductive pattern 14 through a pair of first electrode 32 and second electrode 32 respectively from first power supply 40 and second source 42 generations, two frequency f 1 of output, the AC signal of f2.
Here, the electrostatic capacitance that forms between a pair of first electrode 32 and conductive pattern 14 at two ends about equally.Therefore, the voltage of the first frequency f1 that has of conductive pattern 14 is about 1/2nd of the alternating voltage that applied.Thus, owing to can apply voltage efficiently, the voltage of signals of power supply 40 outputs can be several low-voltages that lie prostrate tens volts.In addition, because the electrostatic capacitance that a pair of second electrode 34 forms also in both sides about equally, so the voltage of signals of second source 42 outputs can be several low-voltages that lie prostrate tens volts.First power supply 40 and second source 42 preferably all use transformer, are used as neutral earthing.
The magnitude of voltage detecting device 44 that detects the magnitude of voltage of each frequency is connected to sensor electrode 36.It constitutes by amplifying by the amplifier 46 of sensor electrode 36 detected AC signal and taking out the identification filter 48 (discriminating filter) that the signal of each frequency uses.Thus, can detect the magnitude of voltage of each frequency.In addition, also comprise the phase detector (not shown) that to differentiate detected signal polarity.
Then, the conductive pattern that this inspection apparatus for pattern 10 is described is checked principle.
Have under the zero defect situation of (opening circuit or short circuit) in inspection, sensor electrode 36 is positioned on the position for the central offset of the conductive pattern 14 of checking object, from first power supply, 40 output AC signals.This AC signal is imposed on conductive pattern 14 through a pair of first electrode 32.
Because first power supply 40 is neutral earthing, so a pair of signal voltage that applies through first power supply 40 is at its two ends phase phasic difference 180 degree.Therefore, because of offsetting, and be roughly 0,, slowly increase more or reduce more near its two ends in pattern center by the magnitude of voltage of normal conductive pattern 14 inductions.Therefore, conductive pattern 14 be do not have short circuit or the situation of the normal pattern that opens circuit under because sensor electrode 36 is positioned at the position with the off-centring of conductive pattern 14, so on sensor electrode, have predetermined voltage.Detect this magnitude of voltage by magnitude of voltage detecting device 44.
On the other hand, under the situation of the pattern 14a that opens circuit that the A that opens circuit is arranged, do not offset the antiphase voltage that applies from about the conductive pattern 14.Therefore, with the sensor electrode 36 of middle position skew in, former state (still not offsetting phase place) detects the magnitude of voltage that applies from an end.This magnitude of voltage ratio is by normal conductive pattern 14 detected magnitude of voltage height.Therefore, if detect the voltage of the frequency f 1 higher, can be used as the pattern detection that opens circuit and go out than predetermined magnitude of voltage.
On the other hand, have or not in inspection under the situation of short circuit, sensor electrode 36 is positioned and checks on the position of off-centring of object conductive pattern 14, from the AC signal of second source 42 output second frequency f2.For not have under the normogram case situation of short circuit, it is the predetermined value voltage of f2 that frequency is arranged in the sensor electrode 36 at conductive pattern 14.Detect this magnitude of voltage by magnitude of voltage detecting device 44.On the other hand, under the situation of the short circuit pattern 14b that short circuit B is arranged, because the balance of voltage that applies from both sides destruction, so detect the voltage higher than general value.Therefore, if detect the voltage of the frequency f 2 higher, can detect and be the short circuit pattern than predetermined magnitude of voltage.
Therefore, move to the direction parallel (the Y direction of Fig. 6) by making sensor electrode 36, and can obtain the magnitude of voltage shown in Fig. 6 right side with pattern.That is, when sensor electrode 36 was positioned on the normal conductive pattern 14, the magnitude of voltage of frequency f 1 in the time of on being in the pattern 14a that opens circuit, detected the magnitude of voltage higher than predetermined value for predetermined value.On the other hand, when sensor electrode 36 was positioned on the normal conductive pattern 14, the magnitude of voltage of frequency f 2 detected the magnitude of voltage of predetermined value, detected the voltage higher than predetermined value in the time of on being in short circuit pattern 14b.
The positional information of this current value and sensor electrode 18 is delivered to control device, and in control device according to the specific defective conductive pattern of these information.That is, during the magnitude of voltage of the frequency f 1 more than detecting predetermined value, will go out as the pattern detection that opens circuit with the pattern of sensor electrode 36 electrostatic coupling.In addition, during the magnitude of voltage of the frequency f 2 more than detecting predetermined value, will go out as the short circuit pattern detection with the pattern of sensor electrode 36 electrostatic coupling.
Certainly, also can have or not this to open circuit simultaneously and the detection of short circuit.Because magnitude of voltage detecting device 44 has the identification filter 48 that the magnitude of voltage that detects each frequency is used, so, also can detect magnitude of voltage separately even apply the voltage of f1 and f2 to conductive pattern 14.Therefore, move, and can detect short circuit simultaneously and open circuit by making the sensor electrode 36 and second electrode 34.
At this moment, as mentioned above,,, signal uprises so applying rate owing to through roughly the same electrostatic capacitance AC signal is imposed on conductive pattern 14 in the two ends.Therefore,, also the voltage that can fully detect can be induced,, also high-precision inspection can be carried out even low-voltage also is difficult to be subjected to the influence of noise etc. even signal is a low-voltage.In addition, owing to be low-voltage,, can simply check so do not need the countermeasure of discharge etc.Further, can be only by detecting open circuit A and short circuit B simultaneously along the mobile primary transducer electrode 36 and second electrode 34 on the direction parallel with conductive pattern 14.
Just be positioned at when sensor electrode under the situation of off position, or be under the situation between opening circuit and opening circuit, can not detect magnitude of voltage by sensor electrode.But, at this moment, do not detect the magnitude of voltage of regulation, and detect 0 magnitude of voltage.Therefore, can go out as the pattern detection that opens circuit detecting the conductive pattern that is roughly 0 magnitude of voltage.
In addition, in the present embodiment, as neutral earthing, and sensor electrode is positioned on the position with misalignment with power supply.This is because can reliably 0 magnitude of voltage be gone out as abnormality detection.But, even not like this, because magnitude of voltage has some variations in normal pattern and the defective pattern, so vicissitudinous pattern can be detected as defect pattern.
Then, use Fig. 7, Fig. 8 to illustrate that detection is opened circuit or the principle of location of short circuit.
Fig. 7 is the figure that the expression off position detects principle, and Fig. 8 is the figure that the expression location of short circuit detects principle.Represent by magnitude of voltage detecting device 44 detected magnitudes of voltage at the downside of figure respectively.
Detecting under the situation about opening circuit, sensor electrode 36 is moved along the pattern 14a that opens circuit.At this moment, detect the magnitude of voltage shown in the downside of Fig. 7.That is, sensor electrode 36 is in before the A that opens circuit during (left side among the figure), detects the voltage of signals value that applies from one-sided (left side the figure).And, surpassed moment of off position at sensor electrode 36, phase change 180 degree, and detect the voltage of signals value that applies from opposition side (right side the figure).Therefore, differentiate by sensor electrode 36 detected signal polarities by phase detector, and the position of polarity upset is detected as off position.The positional information of this testing result and sensor electrode 36 is delivered to control device, in control device, detect off position according to these information.That is, with the phase change of voltage 180 the positions of sensor electrode 36 when spending detect as off position.
On the other hand, under the situation that sensor electrode 36 is moved along short circuit pattern 14b, detect the magnitude of voltage shown in the downside of Fig. 8.That is, sensor electrode 36 was the magnitude of voltage of predetermined value before short circuit B, owing to approach location of short circuit more, balance is destroyed more, so when coming the top of location of short circuit, represent the peak value of rapid rise and fall.And,, come back to the magnitude of voltage of predetermined value if surpass short circuit B.That is, in the position of short circuit B, detect the peak value of magnitude of voltage.The position of the sensor electrode 36 in the time of will detecting this crest voltage value in the control device detects as location of short circuit.
Like this, sensor electrode is moved along defective conductive pattern, by detecting magnitude of voltage at this moment, but and specific defects position.
In addition, in the present embodiment, though movable sensor electrode 36, also removable glass substrate 12.In addition, also can carry out in the time of also can detecting defect pattern checking the detection of carrying out defective locations after whole patterns have zero defect to stop at every turn.In addition, public is being connected under the situation of conductive pattern 14, also can be with public as first electrode.
[embodiment 4]
Then, inspection apparatus for pattern 10 as other embodiment is described.
The gate pattern that disposes on the glass substrate that this inspection apparatus for pattern 10 is particularly useful for using in the display panels and the inspection of Cs pattern.
In the manufacturing process of display panels, on glass substrate 12, dispose gate pattern and Cs pattern at first simultaneously.Gate pattern is a plurality of conductive patterns that dispose by the row shape on glass substrate.The Cs pattern is and its conductive pattern that disposes by the row shape alternately.Because the distance little to the extreme (for example, tens um) of this gate pattern and Cs pattern is so be easy to produce short circuit.The inspection apparatus for pattern 10 that is particularly useful for this test for short-circuit is described.
Fig. 9 represents the approximate vertical view of this inspection apparatus for pattern 10.
Grid is set above glass substrate 12 is used as the feed electrode with electrode 60 with electrode 56, Cs.In addition, sensor electrode 62 is arranged on the conductive pattern of checking object.
Grid is to be arranged on and the conductive sheet of grid with an end of the gate pattern 50 of public 54 opposition side when checking with electrode 56.It has the width of an end that covers whole gate patterns 50, with an end electrostatic coupling of whole gate patterns 50.But,, also can be other width if cover the width of the more than one gate pattern that comprises the gate pattern of checking object.At this moment, also can cooperate sensor electrode 62 described later next mobile to moving of Y direction.
Cs is arranged on the conductive sheet with an end of the Cs pattern 52 of public 58 opposition side with Cs when being inspection with electrode 60.Its also with Cs pattern 52 electrostatic coupling, have the width of an end that covers whole Cs patterns 52.If cover the width of the more than one Cs pattern that comprises object Cs pattern certainly, also can be other width.
Magnitude of voltage detecting device 76 is set in sensor electrode 62, and detects the magnitude of voltage of the position of sensor electrode 62.Detected magnitude of voltage after the positional information of sensor 62 is delivered to control device, is stored.
Magnitude of voltage detecting device 76 constitutes by amplifying by the amplifier 78 of sensor electrode 62 detected AC signal and taking out the identification filter 80 that the signal of each frequency uses.Thus, can check out the magnitude of voltage of each frequency.In addition, the phase detector (not shown) that also comprises the polarity that to differentiate detected signal.
Through grid with electrode 56 and grid with public 54 AC signal that applies frequency f 1 to gate pattern 50.Its by an end is connected to grid with electrode 56, the other end be connected to grid apply with power supply 64 with public 54 grid.On the other hand, with power supply 66 AC signal of frequency f 2 is imposed on Cs pattern 52 by Cs with public 58 with electrode 60 and Cs through Cs.Grid all is neutral earthing with power supply 64 and Cs with power supply 66.
The detection principle of the short circuit A of gate pattern 50 and Cs pattern 52 and the B that opens circuit then, is described.At this moment, sensor electrode 62 is positioned check on the gate pattern 50 or Cs pattern 52 of object.At this moment, sensor electrode 62 preferably be positioned at some position of the off-centring of pattern on.
Under this state, apply the AC signal of frequency f 1, f2 with power supply 66 with power supply 64 and Cs from grid.And, detect the magnitude of voltage of each frequency of sensor electrode 62 by magnitude of voltage detecting device 76.
At this moment, though there has not been to have responded on the normal gate pattern 50 of the short circuit A or the B that opens circuit the voltage of frequency f 1 (grid with the frequency of power supply), there is not the voltage of induction frequencies f2 (Cs with the frequency of power supply).In addition, though responded to the voltage of frequency f 2 (the Cs frequency of power supply) on the normal Cs pattern 52, there is not the voltage (the grid frequency of power supply) of induction frequencies f1.
On the other hand, the voltage of frequency f 1 and the voltage of frequency f 2 have also been responded on the gate pattern 50a of short circuit A having.In addition, in being arranged, the Cs pattern 52a of short circuit A also responded to the voltage of two frequencies of frequency f 1 and frequency f 2.That is, can be judged as the voltage of having responded to frequency f 2 (Cs with the frequency of power supply) gate pattern, responded to frequency f 1 (grid with the frequency of power supply) voltage the Cs pattern generating short circuit.
Then, the situation that has or not the B that opens circuit that detects is described.Have or not in detection under the situation of the B that opens circuit, be conceived to detected magnitude of voltage.When gate pattern 50, Cs pattern 52 all are under the situation of normal pattern, to detect the magnitude of voltage of predetermined value.This is because applied the voltage of antiphase from the both sides of pattern.Owing to have the phase cancellation of voltage,, approach two ends more and more slowly uprise (step-down) so magnitude of voltage is roughly 0 in pattern center.Therefore, with off-centring on the position of sensor electrode 62 of some positions, detect predetermined magnitude of voltage (greater than 0).
On the other hand, under the situation that the pattern 50b, the 52b that open circuit are arranged, owing to do not have phase cancellation, so detect the voltage higher than predetermined value.That is, the pattern that detects the magnitude of voltage higher than predetermined value is detected as open circuit pattern 50b, 52b.
In addition, be in just when sensor electrode under the situation of off position, or under the situation between opening circuit and opening circuit, can not detect magnitude of voltage by sensor electrode.But, at this moment, do not detect predetermined magnitude of voltage, and detect 0 magnitude of voltage.Therefore, detecting the conductive pattern that is roughly 0 magnitude of voltage can be used as the pattern detection that opens circuit and goes out.
By being moved along the Y direction, sensor electrode 62 obtains the magnitude of voltage shown in Fig. 9 right side.That is, when sensor electrode 62 is positioned at that the Cs pattern 52a that has produced short circuit A goes up or gate pattern 50a when going up, the voltage of frequency f 1 and frequency f 2 all detects predetermined value.
On the other hand, when being positioned at when having produced the gate pattern 50b that opens circuit and going up, the magnitude of voltage of frequency f 1 uprises.In addition, when being positioned at when having produced the Cs pattern 52b that opens circuit and going up, detect the high voltage that frequency is f2.
After the positional information of this magnitude of voltage and sensor electrode 62 delivered to control device, in control device, detect the short circuit patterns and the pattern that opens circuit according to these information.That is, with detect frequency be f1 voltage Cs pattern 52 or to detect frequency be that the gate pattern 50 of voltage of f2 is as the short circuit pattern detection.In addition, will detect than predetermined value pattern high or 0 magnitude of voltage to go out as the pattern detection that opens circuit.
Then, the situation that detects defective locations is described.Detecting under the situation of defective locations, sensor electrode 62 is moved along defect pattern.
If sensor electrode 62 is moved along short circuit pattern 50a, 52a, sensor electrode 62 be positioned at short circuit A above the time detect maximum magnitude of voltage (Figure 10).On the other hand, if sensor electrode 62 is moved along open circuit pattern 50b, 52b, then when sensor electrode 62 was positioned at the top of the B that opens circuit, phase overturn 180 was spent (Figure 11).In the control device, according to the positional information detection short circuit of magnitude of voltage (phase-shift detection result) and sensor electrode 62 or the position of opening circuit.
Like this, according to present embodiment, owing to apply AC signal, so that signal applies rate is very high from the two ends of pattern.Therefore, the signal of detection is difficult to be subjected to the influence of noise, can check accurately.In addition, even,, can check simply so do not need the countermeasure etc. of discharging owing to also can check for the AC signal of low-voltage.
In addition, can easily detect the gate pattern that is easy to generate short circuit and the short circuit of Cs pattern.Further, move along the Y direction by making sensor electrode 62, and the inspection that can have or not short circuit simultaneously or open circuit.
In addition, in the present embodiment, grid being arranged with public 54 glass substrate 12 though used, can certainly be not have grid with public 54 glass substrate 12.Do not have grid with public 54 situation under, also can be provided with at the two ends of gate pattern 50 with a pair of grid of the end electrostatic coupling of gate pattern with electrode 56.
[embodiment 5]
Then, use Figure 12 that other embodiment are described.It also is the inspection apparatus for pattern 10 that is applicable to the short circuit that detects gate pattern and Cs pattern.
It has flawless detection according to current value.
In this inspection apparatus for pattern 10, also sensor electrode 62 can be connected to grid is used power supply 66 with power supply 64 and Cs mid point.
Then, the inspection that zero defect (short circuit or open circuit) is arranged of using this inspection apparatus for pattern 10 is described.
At this moment, sensor electrode 62 is positioned check on the gate pattern 50 or Cs pattern 52 of object.And, AC signal is imposed on gate pattern 50 and Cs pattern 52 through separately electrode 56,60 and public 54,58.At this moment, sensor electrode 62 is connected to the center of two power supplys 64,66.At this moment, by the line of connection sensor electrode 62 and power supply 64,66, and form two circuit I R and IL.If there is not the normal pattern of the short circuit A or the B that opens circuit, the current value that then flows through this IR and IL and is reverse about equally.Therefore, under the situation of normal pattern, detect in the current detector 68,70 and be roughly 0 current value.
But, be positioned at sensor electrode 62 under the situation on pattern 50a, the 52b that has produced short circuit A, because the balance of voltage is destroyed (current value among IR and the IL is unequal), so detect high current value in two current detectors 68,70.At this moment the current value and the positional information of sensor electrode 62 are stored in the control device together.
In addition, have under the situation of the B that opens circuit and also detect high current value.But, at this moment, be 0 current value roughly in the current detector that the pattern different with the pattern that has produced the B that opens circuit used.That is, have under the situation about opening circuit, detect high current value in current detector 68, detect at Cs and be roughly 0 current value with current detector 70 at grid at gate pattern.On the contrary, have under the situation about opening circuit, detect high current value in current detector, detect at grid and be roughly 0 current value with current detector 68 at Cs at the Cs pattern.
Therefore, both detect under the situation of high current value with current detector 70 with current detector 68, Cs at grid, can be judged as short circuit, detect under the situation of high current value with one of them of current detector 70 with current detector 68, Cs, can be judged as and open circuit at grid only.
Therefore, move along the Y direction, and can have or not the inspection of opening circuit simultaneously with short circuit by making sensor electrode 62.
Under the situation of specific off position, also can make sensor electrode 62 along there being the pattern that opens circuit to move.Owing to apply the voltage of antiphase from the both sides of pattern, so be the facet phases difference with the off position.Therefore, the variation by seeing phase place by phase-shift detection device (not shown) etc. and can specific off position.In addition, because in the off position, current value is roughly 0, so also can come specific as off position with detecting the position that is roughly 0 magnitude of voltage.
Like this, according to present embodiment, owing to apply AC signal, so that signal applies rate is very high from the two ends of pattern.Therefore, detected signal is difficult to be subjected to the influence of noise, can carry out high-precision inspection.In addition, even since the AC signal of low-voltage also can check, so the countermeasure that does not need to discharge etc. can be checked simply.
In addition, can easily detect the short circuit of the gate pattern and the Cs pattern that are easy to produce short circuit.
[embodiment 6]
Then, use Figure 13 that other embodiment are described.It is used for more easily detecting the short circuit of gate pattern and Cs pattern.
This testing fixture 10 detects the gate pattern 50 and the short circuit that is connected the Cs pattern 52 of an end by public 58 with extraction electrode 82.
Output, the two ends that generate the power supply 64 of AC signal are connected to sensor electrode 62 and public 58.Sensor electrode 62 is the conductive sheets that roughly have same widths with extraction electrode, when detecting short circuit, is positioned to be connected to the top of the extraction electrode 82 of the conductive pattern of checking object, and with electrode 82 electrostatic coupling of drawing.
One end of power supply 64 is connected to public 58, the other end is connected to sensor electrode 62, between public 58 and power supply 64, be provided with and detect the current detector 68 that current value is used.
The short-circuit detecting principle of this inspection apparatus for pattern 10 then, is described.Have or not in detection under the situation of short circuit, sensor electrode 62 is positioned extraction electrode 82 tops that are connected with the gate pattern 50 of checking object.And, from power supply 64 output AC signals.One end of power supply 20 is connected to public 58, the other end is connected to sensor electrode 62.
At this moment, public 58 and Cs pattern 52 electric physical connections.In addition, sensor electrode 62 is electrically connected with gate pattern 50 through extraction electrode 82.Therefore, do not have not flow through electric current under the situation of short circuit at gate pattern 50 and Cs pattern 52.Therefore, under sensor electrode 62 is positioned at situation on the normal pattern, detects and be roughly 0 current value.
On the other hand, if gate pattern 50 and 52 short circuits of Cs pattern are then flow through electric current through the A of short circuit portion.Therefore, under sensor electrode 62 is in situation on the short circuit pattern, detect high current value.
Therefore, if sensor electrode 62 is moved along the Y direction, then detect the current value shown in the right side of Figure 13.That is, under the situation of normal gate pattern 50, detect and be roughly 0 current value, under the situation of the gate pattern 50a that produces short circuit, detect high value current value.In the control device, detect according to the positional information of at this moment current value and sensor electrode 62 and to have or not short circuit.That is the gate pattern 50 that, will the sensor electrode 62 when detecting high current value be electrically connected is as there being the pattern detection of short circuit to go out.
Like this, according to present embodiment, can detect by a power supply and have or not short circuit.
Claims (11)
1, a kind of conductive pattern check-up apparatus, the state of a plurality of conductive patterns that inspection is disposed on substrate is characterized in that, comprising:
A pair of first electrode is electrically connected with the two ends of the conductive pattern more than three of the conductive pattern that comprises object pattern and these object pattern both sides at least;
A pair of second electrode is the pair of electrodes on the conductive pattern that is configured in object pattern both sides, and the difference electrostatic coupling is to the conductive pattern of both sides;
First applying unit imposes on conductive pattern through a pair of first electrode with the AC signal of first frequency;
Second applying unit imposes on conductive pattern through a pair of second electrode with the AC signal of second frequency;
Sensor electrode, for being arranged on the electrode on the object pattern, and electrostatic coupling is to the object pattern;
Voltage detection unit detects the magnitude of voltage of each frequency of sensor electrode;
Defect detection unit detects to have or not according to detected magnitude of voltage and opens circuit and short circuit.
2, conductive pattern pick-up unit according to claim 1, it is characterized in that: voltage detection unit has the recognition unit that comes the current potential of identification sensor electrode to detect by frequency.
3, conductive pattern pick-up unit according to claim 1 and 2 is characterized in that: at least one power supply in first applying unit and second applying unit is neutral earthing, and sensor electrode is positioned on the position with the off-centring of object pattern.
4, conductive pattern pick-up unit according to claim 1 is characterized in that further having:
Mobile unit makes sensor electrode open circuit or the conductive pattern of short circuit moves along detection;
Position detection unit, the magnitude of voltage change-detection from moving process go out to open circuit or the position of short circuit.
5, a kind of conductive pattern check-up apparatus is checked on substrate by a plurality of gate patterns of row shape configuration with gate pattern to be adjacent to a plurality of Cs patterns by the configuration of row shape, and an end of these Cs patterns, is characterized in that with public connection by Cs, comprising:
A pair of grid electrode is electrically connected with at least more than one the two ends of gate pattern that comprise the object gate pattern;
The grid applying unit imposes on object gate pattern with electrode with the AC signal of first frequency through a pair of grid;
The Cs electrode is with at least more than one the other end electrostatic coupling of Cs pattern that comprises adjacent to the object Cs pattern of object gate pattern;
The Cs applying unit imposes on object Cs pattern with electrode with the AC signal of second frequency with public and Cs through Cs;
Electrode with object gate pattern or object Cs pattern electrostatic coupling;
The short-circuit detecting unit detects the magnitude of voltage of sensor electrode;
Defect detection unit is according to the detected magnitude of voltage detection gate pattern and the defective of Cs pattern.
6, conductive pattern check-up apparatus according to claim 5 is characterized in that, further comprises:
Mobile unit makes sensor electrode open circuit or the object pattern of short circuit moves along detection;
Position detection unit, the magnitude of voltage change-detection from moving process open circuit or the position of short circuit.
7, according to claim 5 or 6 described conductive pattern check-up apparatus, it is characterized in that: grid is neutral earthing with applying unit and Cs with the power supply of applying unit, and sensor is positioned on the position with the point midway skew of object pattern with electrode.
8, a kind of conductive pattern check-up apparatus is checked on substrate by a plurality of gate patterns of row shape configuration with gate pattern to be adjacent to a plurality of Cs patterns by the configuration of row shape, and an end of these Cs patterns, is characterized in that with public connection by Cs, comprising:
A pair of grid electrode is electrically connected with at least more than one the two ends of gate pattern that comprise the object gate pattern;
The grid applying unit imposes on object gate pattern with electrode with AC signal through a pair of grid;
The Cs electrode is with at least more than one the other end electrostatic coupling of Cs pattern that comprises adjacent to the object Cs pattern of object gate pattern;
The Cs applying unit imposes on object Cs pattern with electrode with AC signal with Cs with public through Cs;
Sensor electrode with object gate pattern or object Cs pattern electrostatic coupling, links to each other with the power supply of applying unit with Cs with applying unit with grid;
The current value detecting unit detects the current value that flows through between power supply and sensor electrode;
Defect detection unit detects the defective of Cs pattern and gate pattern according to detected current value.
9, conductive pattern check-up apparatus according to claim 8 is characterized in that: sensor electrode is connected to grid and uses the center of the power supply of applying unit with applying unit and Cs, and is in the approximate centre of object pattern.
10, according to claim 5 or 8 described conductive pattern check-up apparatus, it is characterized in that: a pair of grid with in the electrode one be that grid is with public.
11, according to claim 5 or 8 described conductive pattern check-up apparatus, it is characterized in that: a pair of grid with in the electrode at least one by being connected with the gate pattern electrostatic coupling.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003270954A JP4562358B2 (en) | 2003-07-04 | 2003-07-04 | Conductive pattern inspection device |
| JP2003270954 | 2003-07-04 |
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| Publication Number | Publication Date |
|---|---|
| CN1576870A CN1576870A (en) | 2005-02-09 |
| CN100552464C true CN100552464C (en) | 2009-10-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100691699A Active CN100552464C (en) | 2003-07-04 | 2004-07-05 | Conductive pattern check-up apparatus |
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|---|---|
| JP (1) | JP4562358B2 (en) |
| KR (1) | KR101116164B1 (en) |
| CN (1) | CN100552464C (en) |
| TW (1) | TWI289674B (en) |
Families Citing this family (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4629531B2 (en) * | 2005-08-03 | 2011-02-09 | 日置電機株式会社 | Short-circuit inspection apparatus and short-circuit inspection method |
| JP5276774B2 (en) * | 2005-11-29 | 2013-08-28 | 株式会社日本マイクロニクス | Inspection method and apparatus |
| JP5050394B2 (en) * | 2006-04-20 | 2012-10-17 | 日本電産リード株式会社 | Substrate inspection apparatus and substrate inspection method |
| JP4915776B2 (en) * | 2006-04-27 | 2012-04-11 | 日本電産リード株式会社 | Substrate inspection apparatus and substrate inspection method |
| JP4730904B2 (en) * | 2006-04-28 | 2011-07-20 | 日本電産リード株式会社 | Substrate inspection apparatus and substrate inspection method |
| JP2008014918A (en) * | 2006-06-30 | 2008-01-24 | Oht Inc | Circuit pattern inspecting device and circuit pattern inspection method |
| KR100799161B1 (en) * | 2006-07-20 | 2008-01-29 | 마이크로 인스펙션 주식회사 | Non-contact type single side probe and inspection apparatus and method for open/short test of pattern electrodes used thereof |
| JP4291843B2 (en) * | 2006-10-19 | 2009-07-08 | 株式会社東京カソード研究所 | Pattern inspection device |
| JP2009121894A (en) * | 2007-11-14 | 2009-06-04 | Fujitsu Ltd | Method and device for inspecting defect of conductor pattern |
| JP5387818B2 (en) * | 2008-12-11 | 2014-01-15 | オー・エイチ・ティー株式会社 | Circuit pattern inspection device |
| JP5122512B2 (en) * | 2009-04-17 | 2013-01-16 | オー・エイチ・ティー株式会社 | Circuit pattern inspection device |
| JP5391819B2 (en) * | 2009-05-14 | 2014-01-15 | 日本電産リード株式会社 | Touch panel inspection device |
| JP5438538B2 (en) | 2010-02-08 | 2014-03-12 | 日本碍子株式会社 | Apparatus with abnormality determination function and abnormality determination method |
| JP5533169B2 (en) * | 2010-04-13 | 2014-06-25 | 日本電産リード株式会社 | Inspection device |
| JP5305111B2 (en) * | 2011-01-21 | 2013-10-02 | オー・エイチ・ティー株式会社 | Circuit pattern inspection device |
| JP5580247B2 (en) * | 2011-04-27 | 2014-08-27 | 株式会社ユニオンアロー・テクノロジー | Pattern inspection device |
| JP2012238066A (en) * | 2011-05-10 | 2012-12-06 | Japan Display East Co Ltd | Capacitive touch panel and display device |
| CN103308817B (en) * | 2013-06-20 | 2015-11-25 | 京东方科技集团股份有限公司 | Array base palte line detection apparatus and detection method |
| KR101537563B1 (en) * | 2013-11-06 | 2015-07-20 | 마이크로 인스펙션 주식회사 | Method for detecting defect location of pattern electrode used non contact type probe |
| CN104122689A (en) * | 2014-07-29 | 2014-10-29 | 深圳市华星光电技术有限公司 | Testing device and testing method of testing device |
| JP6674842B2 (en) * | 2016-05-24 | 2020-04-01 | 京セラ株式会社 | Sensor substrate and sensor device |
| KR101823317B1 (en) * | 2016-07-01 | 2018-03-14 | 로체 시스템즈(주) | Appartus and method of inspecting wires of panel |
| CN108226695B (en) * | 2018-01-02 | 2021-10-15 | 京东方科技集团股份有限公司 | Device and method for detecting and positioning short circuit of adjacent metal wire |
| CN111007432B (en) * | 2019-12-12 | 2022-06-17 | 芜湖伦丰电子科技有限公司 | Method for searching open short circuit position of silver paste |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2000227452A (en) | 1999-02-04 | 2000-08-15 | Hioki Ee Corp | Circuit board inspecting device |
| JP4450143B2 (en) | 2001-05-24 | 2010-04-14 | オー・エイチ・ティー株式会社 | Circuit pattern inspection apparatus, circuit pattern inspection method, and recording medium |
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- 2003-07-04 JP JP2003270954A patent/JP4562358B2/en not_active Expired - Lifetime
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- 2004-06-29 TW TW093118973A patent/TWI289674B/en active
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| KR101116164B1 (en) | 2012-03-06 |
| CN1576870A (en) | 2005-02-09 |
| TWI289674B (en) | 2007-11-11 |
| TW200508625A (en) | 2005-03-01 |
| JP2005024518A (en) | 2005-01-27 |
| JP4562358B2 (en) | 2010-10-13 |
| KR20050004046A (en) | 2005-01-12 |
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