JP5991456B2 - Circuit board individual identification device and individual identification method - Google Patents

Description

The present invention relates to a circuit board individual object identification device and identification methods.

Generally, the individual identification means and method for traceability realization of the circuit substrate has been proposed. For example, as disclosed in Patent Document 1, a means for forming a different identification mark on the surface of a circuit board on a pattern on a pattern, or as disclosed in Patent Document 2, a bar code, a two-dimensional code, etc. Means for printing and means for applying pre-solder or adhesive in a different pattern for each individual to a plurality of lands or through holes not related to the circuit pattern as disclosed in Patent Document 3 are disclosed. . Further, as disclosed in Patent Document 4, an RFID chip is mounted on a printed wiring board, and the individual information and manufacturing information of the product is recorded inside the chip. As disclosed in Patent Document 5, There are known means for imprinting or printing a plurality of positioning marks at specific coordinate positions on a circuit corresponding to serial numbers or types assigned to individual substrates or chips.

JP 2006-228875 A JP 2003-078223 A JP-A-10-270814 JP 2004-087582 A JP-A-2005-252281

However, even any means disclosed in Patent Documents 1 to 5, previously designed these means are provided, by applying a new said means for the circuit board of the varieties that are produced additional design of the circuit board in order to realize traceability, and verification of the new individual identifying means corresponding to the identification means provided are required, additional design itself and, it effects of changes in the quality of the companion cormorants circuit board There is a problem that the cost due to the installation of the individual discriminating means is large.

The present invention has been made to solve the conventional problems, that is, an object of the present invention, a simple and easy individual unit identification apparatus of the circuit board you realized and identification methods individual identification of the circuit board Is to provide.

The principles of the present invention, elements constituting the measurement object in the circuit board, as well as measuring the relative position displacement of parts, is to identify the previous SL circuit board by using the relative position displacement.
Individual unit identification apparatus of the circuit board of the present invention, measuring the position of a plurality of measurement target on the circuit board, the positional information for each of said measurement object of the measurement values of the measurement object and the design value of the measurement target by providing position information acquisition means for acquiring, and registration means for registering the combination of the position information acquired by the position information obtaining means as the substrate identification code as is obtained by solving the problems described above.

Individual unit identification method of the circuit board of the present invention, measuring the position of a plurality of measurement target on the circuit board, the positional information for each of said measurement object of the measurement values of the measurement object and the design value of the measurement target a step of obtaining as by the combination of the acquired positional information and a procedure for registering as a substrate identification code, is obtained by solving the problems described above.

In the present invention, individual identification of a circuit board can be realized simply and easily.

It is an overall schematic diagram of one embodiment der Ru circuit board of an individual identification apparatus of the present invention. It is a flowchart figure which shows the operation | movement of the identification apparatus shown in FIG. It is a schematic plan view showing a circuit board. It is explanatory drawing which shows the through hole and land pattern in one measurement object. It is explanatory drawing which shows the coordinate space used for an area | region classification. It is explanatory drawing which shows an example of a data structure of a production information database. It is a flowchart figure which shows a search procedure. It is explanatory drawing which shows the example of collation in a search. It is explanatory drawing which shows the modification of the coordinate space used for an area | region classification. It is an overall schematic view of a first modification der Ru circuit identification device substrate of the present invention. Is an explanatory diagram showing a coordinate space used for area classification in the fourth individual identification apparatus according to a modification der Ru circuit board of the present invention. Is an explanatory diagram showing a coordinate space used for area classification in the individual identification apparatus of the sixth modification der Ru circuit board of the present invention. Is a flow chart showing a retrieval procedure in the individual identification apparatus of the sixth modification der Ru circuit board of the present invention. Verification example of retrieval in the sixth modification der Ru circuit identification device substrate of the present invention; FIG.

It will be described below with reference to examples and modification of the individual identification apparatus of the present onset Ming circuit board in the drawings.

Individual identification apparatus of the circuit board according to an embodiment of the present invention is to obtain location information for a plurality of measurement target 110 designated in advance on the circuit board 100, board of the circuit board 100 a combination of these position information and performs identification of the circuit board 100 using as identification codes.

  As shown in FIG. 1, the circuit board individual identification device measures the positions of a plurality of measurement objects 110 on the circuit board 100 and acquires position information for each measurement object 110 (position information acquisition means). 10 and a registration unit (registration) that receives the combination of the position information acquired by the position information acquisition unit 10 and registers it in the production information database 30 in association with the serial number (individual identification information) assigned to each circuit board 100 Means), a production information database (storage means) 30 for storing production information of the circuit board 100, and a combination of position information of the circuit board 100 to be retrieved acquired by the position information acquisition unit 10 as a search key. A search unit (search means) 40 for searching for the serial number of the circuit board 100 from the production information stored in the information database 30; An output unit (output means) 50 for outputting a search result or the like by the search unit 40, and various input by the user (e.g., key input) input accepting unit that accepts an (input receiving means) 60.

  In the present embodiment, as shown in FIG. 3, a plurality of measurement objects 110 specified in advance on the circuit board 100 are respectively designed coordinate positions on the circuit board 100 (center coordinate positions in the present embodiment). Includes a through hole (first measurement target part) 111 and a land pattern (second measurement target part) 112 that coincide with each other.

  As illustrated in FIG. 1, the position information acquisition unit 10 includes a position measurement unit 11 that measures the positions of a plurality of measurement targets 110 that are specified in advance on the circuit board 100, and a measurement target 110 that is measured by the position measurement unit 11. The difference calculation unit 12 that calculates the difference between the measured value of the measurement object 110 and the design value of the measurement object 110, and the difference calculated by the difference calculation unit is regarded as a point on the coordinate space, and the difference divides the coordinate space into a plurality of pieces in advance. And a region classifying unit 13 that classifies each of the plurality of segmented regions and obtains classification information for each measurement object 110.

As shown in FIG. 1, the position measuring unit 11 captures an image of the appearance of the substrate supply stage 11 a that supplies the circuit board 100 and the surface of the circuit board 100 that is fixed to the imaging stage 11 e and is supplied by the substrate supply stage 11 a. An image for measuring the position of the measurement object 110 based on the sensor 11b, an image memory 11c that holds the appearance image of the circuit board 100 captured by the image sensor 11b, and the appearance image of the circuit board 100 that is stored by the image memory 11c. And a measuring unit 11d.
Specifically, as shown in FIG. 4, the position measuring unit 11 uses the position of the positioning reference hole 113 as a reference, and the XY coordinates (Xh, Yh) of the center 111a of the through hole 111 and the center 112a of the land pattern 112. XY coordinates (Xr, Yr) are measured, and a difference ΔX in the X-axis direction and ΔY in the Y-axis direction are calculated as values indicating the relative positions of the through hole 111 and the land pattern 112.

The difference calculation unit 12 calculates a difference between the measurement value of the measurement target 110 measured by the position measurement unit 11 and the design value of the measurement target 110. Specifically, the difference calculation unit 12 includes the through hole 111 and the land pattern 112. The difference between the measured value of the relative position and the design value of the relative position of the through hole 111 and the land pattern 112 is calculated.
In the present embodiment, the design coordinate positions of the through hole 111 and the land pattern 112 on the circuit board 100 coincide with each other, and thus the difference is the difference ΔX in the X-axis direction and ΔY in the Y-axis direction. .

The area classification unit 13 regards the difference (difference ΔX in the X-axis direction and ΔY in the Y-axis direction) calculated by the difference calculation unit 12 as coordinates (ΔX, ΔY) in the coordinate space, and the coordinates (ΔX, ΔY) However, it classifies which of a plurality of divided areas formed by dividing a coordinate space as shown in FIG. 5 into a plurality of pieces in advance, and obtains classification information for each measurement object 110.
More specifically, for example, when the difference ΔX in the X-axis direction and ΔY in the Y-axis direction are μ <ΔX and −μ ≦ ΔY ≦ μ, the coordinates (ΔX, ΔY) are the region ( P1-0).
The classification of the difference by the area classification unit 13 will be described in detail below.
The position information used in the present invention is synonymous with the difference ΔX and the difference ΔY that are coordinate axes in FIGS. 5, 9, 11, and 12.

The registration unit 20 receives a combination of position information (classification information) of each measurement object 110 acquired by the position information acquisition unit 10 and associates the combination of these position information with a serial number assigned to each circuit board 100. Are registered in the production information database 30.
Specifically, as illustrated in FIG. 6, the registration unit 20 includes the serial number assigned to the circuit board 100 and the classification information (area (P1-N1) for the number of measurement objects 110 (through holes 111). And the like) are registered in the production information database 30 in association with each other.

  The search unit 40 collates the combination of the position information (classification information) of the circuit board 100 to be searched received from the position information acquisition unit 10 with the combination of the position information (classification information) stored in the production information database 30. Thus, the serial number of the corresponding circuit board 100 is retrieved from the production information database 30 and specified. In this embodiment, the corresponding circuit received from the position information acquisition unit 10 as shown in FIG. When the combination of the classification information of the board 100 and the combination of the position information (classification information) stored in the production information database 30 completely match, it is considered that the serial number of the corresponding circuit board 100 has been specified.

  The output unit 50 outputs various information and data such as search results by the search unit 40. When the serial number of the corresponding circuit board 100 is specified by the search unit 40, the corresponding serial number is output. If the serial number of the corresponding circuit board 100 is not specified, a message indicating that there is no corresponding is output. The specific configuration of the output unit 50 may be any display display, printer, or the like.

  In addition, about the image memory 11c, the image measurement part 11d, the difference calculation part 12, the area | region classification | category part 13, the registration part 20, the production information database 30, the search part 40, etc. which were mentioned above, a display, a control part, a memory | storage part, a communication part, It is configured as software executed by a server or the like equipped with an auxiliary storage device or the like.

  Next, the operation of the circuit board individual identification apparatus of the present invention will be schematically described with reference to the flowchart of FIG.

  First, the entire designated surface of the circuit board 100 to be identified is imaged by the image sensor 11b, and the captured appearance image of the circuit board 100 is held in the image memory 11c (S101). FIG. 3 shows an example of the appearance of the circuit board 100.

  Next, as shown in FIG. 4, the XY coordinates (Xh, Yh) of the center 111a of the through hole 111 specified in advance and the XY coordinates (Xr, Yr) of the center 112a of the land pattern 112 are stored in the image memory 11c. Is measured from the appearance image of the circuit board 100 stored in (S102), and the difference ΔX in the X-axis direction between the XY coordinates (Xh, Yh) of the center 111a and the XY coordinates (Xr, Yr) of the center 112a and the Y-axis direction ΔY is calculated (S103).

  Next, the positive / negative and absolute values of ΔX and ΔY obtained in S103 are regarded as coordinates (ΔX, ΔY) on the XY coordinates, and any of a plurality of pre-designated segment areas on the XY coordinate space shown in FIG. It is determined whether the coordinates (ΔX, ΔY) belong, and the area to which the coordinates (ΔX, ΔY) belong is converted into numbers or symbols to be classified information (S104).

  Next, the above-described procedure of S102 to S104 is performed on all measurement objects 110 (through hole 111, land pattern 112) designated in advance (S105).

  Next, when a serial number has not yet been assigned to the circuit board 100 that has undergone the procedures of S101 to S105 (YES in S106), a serial number of the target circuit board 100 is newly created (S107). The classification information of all measurement objects 110 (through holes 111, land patterns 112) and the serial numbers of the circuit boards 100 are registered in the production information database 30 in association with each other (S108).

  On the other hand, when the serial number has already been assigned and registered to the circuit board 100 that has undergone the procedures of S101 to S105 (NO in S106), the measurement object 110 (through-hole 111, land) obtained by the procedures of S101 to S105. Using the position information (classification information) of the pattern 112) as a search key, the production information database 30 is searched for circuit boards 100 having the same classification information for all measurement objects 110, and the serial numbers of the target circuit boards 100 are searched. The result is output (S109).

  Note that regarding whether or not the serial number is assigned to the corresponding circuit board 100 in S106, the user inputs the presence or absence of the assignment using the input receiving unit 60 or the like at an arbitrary timing.

  Next, an example of the data setting of the production information database 30 in which the area setting in the above-described step S104 and the obtained classification information are registered will be described.

  First, in order to drill through-holes 111 in circuit board 100, particularly through-holes 111 having a diameter of 0.5 mm or less, a laser drill device, that is, a stage equipped with a laser irradiation head has been moved to a predetermined position. It is common to use a laser drill apparatus provided with means for controlling an optical path and drilling a single hole or a plurality of holes by one irradiation. The machining position accuracy of the laser drill apparatus mainly depends on the positioning accuracy of the stage, and the stage is mainly servo-controlled. Therefore, it can be determined that the variation in the center position of the through hole 111 generally follows a normal distribution.

  The accuracy of the center position of the land pattern 112 depends on the processing accuracy of the etching mask pattern and the relative positioning accuracy of the circuit board 100 and the etching mask pattern, but the etching mask pattern is mainly laser processing or blast processing. Therefore, it can be determined that the variation in the center position of the land pattern 112 generally follows a normal distribution as in the case of the through hole 111.

Next, for simplification of explanation, it is assumed that the standard deviations of the center coordinates of the through hole 111 and the center coordinates of the land pattern 112 are all the same standard deviation σ, and 0 < Define μ such that μ <σ.
Then, when the XY coordinates are divided into three by XY components with the prescribed values μ and −μ as boundaries, the XY coordinates are divided into nine regions as shown in FIG. Regarding the names of the regions in FIG. 5, 0 in each XY component means near 0 (−μ or more and μ or less), N1 is less than −μ, and P1 is greater than μ.
For simplification of description, if the above-mentioned coordinates (ΔX, ΔY) have the same probability of belonging to each region shown in FIG. 5, the value of μ is −Z in the normal distribution table. From the value of Z at which the integrated value in the ~ Z section is near 0.3333, μ≈0.43σ.

  In the production information database 30, as shown in FIG. 6, for one individual circuit board 100, as shown in FIG. 6, one serial number is assigned to each measurement object 110 (through hole 111). The area numbers obtained in the above-described procedure S104 are recorded for the number of measurement objects 110 (through holes 111) to be measured.

  Next, an example of a procedure for retrieving a product serial number from the classification information indicated in the procedure number S109 will be described with reference to the flowchart of FIG.

  First, the entire designated surface of the circuit board 100 to be searched is imaged by the image sensor 11b under the same conditions as when registering, and the appearance image of the circuit board 100 is held in the image memory 11c (S101).

  Using the measurement object 110 (through hole 111) designated in advance in the circuit board 100, the classification information obtained in the above-described steps S102 to S105 is collated with the contents of the production information database 30 (S121).

  The area numbers of the respective through holes 111 are compared, and the number of coincidence is obtained for all serial numbers (S122). When a coincidence is found in all the through holes 111 (S123), the specified circuit board is obtained. A serial number of 100 is output as a search result (S124, a collation example is shown in FIG. 8), and if it is not found, “not applicable” is output (S130).

  Further, when the variation in the positional deviation amount of the measurement object 110 (through hole 111) is large with respect to the imaging resolution of the position measurement unit 11, two prescribed values for the region division are set for each of the X and Y components (0 <μ1). <Μ2 <σ) may be provided, and X and Y components may each be divided into 5 at least, and a total of 25 may be divided as shown in FIG.

An example regarding only the X component is as follows.
That is, “region N2” is ΔX <−μ2, “region N1” is −μ2 ≦ ΔX <−μ1, “region 0” is | ΔX | ≦ μ1, “region P1” is μ1 <ΔX ≦ μ2, “region P2” ”Is ΔX <μ2.

  As in the example in which the coordinate space shown in FIG. 5 is divided into nine, assuming that the probability of belonging to each region is the same (1/25), the value of μ1 is the integral value in the −Z to Z interval in the normal distribution table. From the value of Z that takes 0.2, μ1≈0.25σ. Similarly, the value of μ2 is μ2≈0.84σ from the value of Z where the integral value is 0.6.

  The number of regions divided by each XY component may be an arbitrary number of 3 or more according to the imaging resolution of the position measuring unit 11 and the capacity of the production information database 30, and the prescribed value for region division is 2 as well. It goes without saying that any arbitrary value of two or more is acceptable.

  Next, typical implementation conditions for practical use of the present invention will be described below.

  Based on the general design rules of the surface-mounted circuit board 100, the tolerances of the center position of the through hole 111 and the center position of the land pattern 112 are the most frequently used through hole 111 having a diameter of 0.3 mm. Both are ± 0.1 mm.

Although depending on the reliability and yield of the drilling machine for the through hole 111, when the standard deviation σ of the variation of the center position of the through hole 111 and the center position of the land pattern 112 is 25 μm, which is 1/4 of the tolerance, the through hole Since it is desirable that the divided areas have an equal probability with respect to the difference between the center positions of 111 and the land pattern 112, the prescribed value when the area is divided into nine is μ≈0.43σ = 10.75 um, The prescribed values for dividing into 25 are preferably μ1≈0.25σ = 6.25 μm and μ2≈0.84σ = 21.00 μm.
In addition, since the prescribed value for area division needs to take a value of one pixel or more on the input image, the imaging resolution of the position measurement unit 11 is preferably 5 μm or less.

  Next, in order to verify the reliability of the present invention, the probability that at least one set of area information matches among the total production quantity N of circuit boards 100 will be considered.

  When the number of through-holes 111 as the measurement object 110 is m and the number of divided areas per through-hole 111 is S, combinations of area information that can be taken by one circuit board 100 are as follows. Become. In the following formula, S to the mth power is abbreviated as S ^ m.

  Furthermore, it is assumed that the area information obtained when one circuit board 100 is produced and m through-holes 111 are measured appears at an equal probability from among the S powers of m.

  In this case, the total number of combinations of area information in the N circuit boards 100 is (S ^ m) ^ N.

  In general, the combination of N different numbers in order is K! / (K-N)! (K! Is the factorial of K), but if replaced with K = (S ^ m), this is the total number of combinations when the area information obtained from the N circuit boards 100 are all different.

  From the above, the probability P that the same combination of area information of the N circuit boards 100 does not appear at all is the total number of combinations when the area information obtained from the N circuit boards 100 is different. P = (K! / (K−N)!) / K ^ N divided by the total number of combinations of area information on the circuit board 100.

  On the contrary, if the probability that the region information matches at least one set, 1-P.

Since the value of P must be as close to 1 as practical (N = 1 if P = 1), K needs to be sufficiently larger than N.
The condition for K to make the probability (1-P) that the region information matches at least one set with respect to the production quantity N is 1 / (A * N) or less is 1 ≧ P ≧ (1-N / K) From the relationship of ^ N, K ≧ N / (1- (1-1 / (A * N)) ^ (1 / N)) is a guide.

  From the above, the minimum number of through holes 111 can be obtained as a value obtained by rounding up the minimum value of the solution m (= log (K) / log (S)) of the above inequality.

  The production quantity N of the circuit board 100 is generally on the order of 10 to the 6th power, and the value of A indicating the reliability of the uniqueness of the area information is assumed to be 1 ppm when N = 1000. Assuming 100, when the number of area divisions S is 9 and 25, the following Table 1 is obtained.

  Although the value of A indicating reliability is assumed to be 100 of the lowest line, it is preferable that this value is also sufficiently high.

  However, every time the value of A is multiplied by 10, the minimum number of through-holes 111 increases by one, so it is sufficient if the number of through-holes to be measured is about 1.5 times the minimum number of through-holes. You can see that it can withstand practical use.

  In the circuit board individual identification apparatus of the present embodiment obtained in this way, the individual identification of the circuit board 100 using the randomness of the relative position error in the processing of the through hole 111 and the land pattern 112 to be measured 110 is performed. Even if it is difficult to mount an RFID chip on which individual information is recorded or to directly print an individual identification code such as a barcode or a two-dimensional code, the traceability of the product Can be secured easily and easily.

Next, a modification of the circuit board individual identification device of the present invention will be described below.
In the following description of the modified example, only the differences from the above-described embodiment will be described, and the description of other than the differences will be omitted.

  First, a circuit board individual identification apparatus according to a first modification of the present invention will be described with reference to FIG.

  In the embodiment described above, the image sensor 11b is an area sensor fixed to the imaging stage 11e, and is configured to image the entire specified surface of the circuit board 100. However, the resolution and circuit of the image sensor 11b are described. When the imaging resolution of the position measurement unit 11 does not satisfy the recommended value due to the size of the substrate 100, as shown in FIG. 10, an XY stage (moving means) 11g that moves the image sensor 11b is used as the imaging stage 11e. It may be provided above.

In this case, when the circuit board 100 is supplied to a predetermined position, the XY stage 11g is moved to the designated imaging position, and a part of the surface of the circuit board 100 is imaged by the image sensor 11b at the imaging position. The image is stored in a designated area of the individual image memory 11f.
Then, the above-described operation is executed at all the imaging positions, and all the appearance images on the individual image memory 11f obtained are synthesized based on the position of the XY stage 11g that captured each appearance image, and the image memory (synthesized image). The overall appearance image of the circuit board 100 can be obtained by outputting to the memory 11c.

  Next, a circuit board individual identification apparatus according to a second modification of the present invention will be described below.

  In the second modification, when the image sensor 11b captures an image, the image sensor 11b is a line sensor in the Y direction, and the substrate supply stage 11a is moved at a constant speed in the X direction, or the image sensor 11b itself is on the X stage, etc. The image sensor 11b is configured to perform an imaging operation while moving at high speed. Even in this case, the same imaging effect can be obtained.

  Next, a circuit board individual identification apparatus according to a third modification of the present invention will be described below.

  In the above-described embodiment, the measurement target 110 specified in advance on the circuit board 100 is a through hole in which the design coordinate positions (center coordinate positions) on the circuit board 100 coincide with each other as shown in FIG. 111 and the land pattern 112 have been described, but besides these, a resist opening having the same design coordinate position (coordinate position of the center) on the circuit board 100, a wiring pattern, a silk pattern, etc. Among the patterns formed on the circuit board 100, position measurement is easy, is within the same field of view of the image sensor 11b, and the standard deviation σ of variation in the measured position is somewhat high (for example, 1 / of tolerance). 4 or more) Any one or a combination of patterns may be arbitrarily selected and used as the measurement object 110.

  In this case, in selecting the measurement target 110, there may be a deviation of the processing position itself, a deviation of the resist formation position, and a deviation of the silk printing position with respect to the design value for each position of the circuit board 100. It is preferable to extract evenly from every position.

  Next, a circuit board individual identification apparatus according to a fourth modification of the present invention will be described with reference to FIG.

  In the above-described embodiment, the generation of the classification information in step S104 has been described as classifying into 9 or 25 divided areas by focusing only on the positive / negative of the difference, but the imaging resolution of the position measurement unit 11 is measured. If the standard deviation σ of the center coordinate variation of the object 110 (through hole 111) is sufficiently fine, a classification that focuses not only on the difference but also on the size and direction, for example, as shown in FIG. In addition, the absolute value and the direction when the difference (ΔX, ΔY) between the center positions of the first measurement target unit and the second measurement target unit is a two-dimensional vector, that is, the range in the polar coordinates (r, θ) are classified. It is good.

  When the region is divided into eight threshold values in increments of 45 degrees and two threshold values of r, μ and 2μ, the definition of the region number to which it belongs is as shown in FIG.

  Note that the number of threshold values of θ and r may be arbitrarily set according to the imaging resolution of the position measurement unit 11, the distribution of the probability belonging to the region, and the like.

  Next, a circuit board individual identification apparatus according to a fifth modification of the present invention will be described below.

  In the fifth modified example, all measurement targets are generated at the time of generation of classification information due to relative positional shifts due to errors in processing reference positions of through holes, land patterns, resist openings, wiring patterns, and silk patterns as the measurement targets 110. In order to prevent the probability that the regions to which the 110 (through hole 111) belongs becomes high, for example, the center position of the positioning reference hole 113 drilled on the circuit board 100 shown in FIG. And the difference between the measured value and the design value relative to the center position of the location where the design coordinate position matches or is close (land pattern, resist opening, silk pattern, etc., which is part of the wiring pattern) A correction unit (not shown) that offsets the error of the machining reference position using the average value as a correction value is added to the position information acquisition unit 10.

  Next, a circuit board individual identification apparatus according to a sixth modification of the present invention will be described with reference to FIGS.

  The classification information in FIG. 7 is used to avoid an event in which a segmented area identified by a certain measurement object 110 is regarded as an adjacent area and erroneously determined to be inconsistent due to repeated measurement errors in the position measurement of the measurement object 110. In the verification procedures S121 to S123, a determination unit that treats up to adjacent regions among the divided regions as shown in FIG. 12 may be added to the search unit.

  That is, as shown in FIG. 13, when no matching region belonging to all the measurement objects 110 (through holes 111) is found, the production information database 30 has a predetermined number of measurement objects 110 that do not match. Only the following items are sorted in ascending order (S125), and the serial numbers with the smallest number of non-matching measurement objects 110 are targeted (S126). If all the non-matching parts are adjacent (S127), the serial numbers are searched. As a result (S124), the collation example is shown in FIG.

  If there is a region that is not adjacent in S127, a serial number with the next largest number of mismatched measurement objects 110 (through holes 111) is extracted (S128), and the same comparison as in step S127 is performed.

  If there is a region that does not match all the sorted serial numbers and is not adjacent (S129), an operation of outputting “not applicable” (S130) may be added.

However, in the example of 9 area division using one specified value of area division as shown in FIG. 5, in the measurement object 110 (through hole 111) that becomes the area (0-0) near the origin at the time of registration, If erroneous detection up to the adjacent region is recognized for both XY components, the coincidence-handling region and the entire region become equal, so that the region identification of the through hole 111 is impossible. Therefore, in the case of this modification, it is indispensable to set at least two prescribed values for area division on both the plus side and the minus side as in the example shown in FIG.
In the case of the example in FIG. 12, adjacent areas are areas connected by double arrows, for example, adjacent areas of the area (0-0) meaning the vicinity of the origin are the area (0-N1) and the area (0-P1). ), Region (N1-0), region (P1-0), region (N1-N1), region (N1-P1), region (P1-N1), and region (P1-P1).

  Furthermore, in the above modification, there is an event in which the classification information obtained at the time of registration in the production information database 30 and the classification information of the registered circuit board 100 match due to repeated measurement errors, or different classification information. It is necessary to avoid a phenomenon in which a plurality of circuit boards 100 whose classification information is determined to coincide with each other are considered to be coincident with each other because they are all adjacent to each other and are actually regarded as different areas.

  Therefore, means for clearly indicating presence / absence information on the risk of misjudgment of classification information due to repetitive measurement errors, such as how close the measurement value is to the prescribed value of area division to the classification information registered in the production information database 30, A means for limiting candidates for adjacent areas to be treated as matching may be provided together.

  For example, as in the embodiment shown in FIG. 5 and the like, the prescribed value of region division μ1 = σ / 4 = 6.25 μm, the maximum repetition error during measurement is the same as the measurement resolution, and the value is μ1 / 5 = σ Consider the case of /20=±1.25 um.

  If the absolute value of the difference calculation value of the measurement target 110 (through hole 111) on the circuit board 100 to be measured is 6.25−1.25 = 5.00 μm or less in both XY coordinates, there is no risk of erroneous determination. It is determined that (0-0).

  On the other hand, if the absolute value of the X coordinate is more than 5.00 um and not more than 6.25 um, there is a risk of misjudgment with the area (P1-0) adjacent to the plus side in the X direction, the area (0-0), It determines with a misjudgment risk (P1-0), and the measurement value is held together.

  Similarly, if the measurement object 110 (through-hole 111) has an absolute value of more than 5.00 μm and not more than 6.25 μm in both XY coordinates, an area (P1-0) and an area (0 -P1), it is determined that there is an erroneous determination risk with the three regions of region (P1-P1), and it is determined that the region (0-0) and the erroneous determination risk (P1-0, 0-P1, P1-P1).

  If there is at least one measurement target 110 having a risk of misjudgment, or if a registered circuit board 100 in which the area information of all measurement targets 110 matches is found, the measurement values of all measurement targets 110 And record them together.

  At the time of search, if the measurement object 110 (through hole 111) is the area (0-0) and there is no erroneous determination risk determination, the area information in the measurement object 110 to be compared is the area (0-0) and the erroneous determination. Only if there is no risk is considered a match.

  On the other hand, in the case of region (0-0) and misjudgment risk (P1-0) determination, there are two types of region information of the measurement target 110 to be compared: region (0-0) and region (P1-0). In addition, only one of the two types of misjudgment risk is considered coincident.

  Similarly, in the case of region (0-0) and misjudgment risk (P1-0, 0-P1, P1-P1) determination, the region information in the measurement target 110 to be compared is the region (0-0). Any one of the four types including, and only one of the four types of misjudgment risk is regarded as coincident.

  Still, when a plurality of circuit boards 100 are determined to coincide with the circuit board 100 to be measured, the measurement values (differences) of the measurement target 110 (through hole 111) having a risk of erroneous determination are compared with each other, and the measurement is most performed. If the difference between the values (differences) is small, or there are multiple through-holes 111 having a risk of misjudgment, the search unit is provided with a determination unit that makes the search result the smallest sum of squares of the difference between the measured values (differences). May be.

  As described above, when the measurement result is recorded with the resolution of σ / 20 by combining the division area information, the erroneous determination risk information, and the measurement value of the registered circuit board 100, one measurement object 110 ( Since there are 36 combinations of measurement values of the area (0-0) having an erroneous determination risk in the through hole 111), when the number of the through holes 111 of the measurement target 110 is m, the data coincides between the two circuit boards 100 The probability is reduced to 1/36 m compared to the above example.

  Next, a circuit board individual identification apparatus according to a seventh modification of the present invention will be described below.

  In the seventh modified example, in order to eliminate the risk of measurement repetition error in the above example, the measurement deviation can be realized by using a measuring means that can realize the standard deviation of the measurement repetition error sufficiently small relative to the standard deviation of the processing error, for example, 1/20 or less. As position information to be registered in the information database 30, classification information regarding the segmented area is not used, but the difference calculation value is replaced with an approximate value obtained by rounding the maximum repetition error or less at the time of measurement.

  In this case, the approximate value corresponding to the classification information is a search result that should obtain a serial number in which all the measurement objects 110 (through holes 111) match.

Having described an exemplary circuit identification device and identification method of a substrate is an example of the present invention with reference to the accompanying drawings, it can be arbitrarily combined including their application the application presence.

  Moreover, although a part or all of said embodiment can be described also as the following additional remarks, it is not restricted to the following.

(Additional remark 1) The position information acquisition means which measures the position of the some measurement object on a circuit board, and acquires the difference of the measured value of the said measurement object, and the design value of the said measurement object as position information for every said measurement object; , the position information acquiring means has been combined with registration means and individual body identification system of a circuit board Ru comprising a registering as a substrate identification code of the position information acquired by.

(Supplementary Note 2) the plurality of measurement target includes pre Symbol circuit first measurement object part coordinate position on the definitive design on the substrate is coincident or near to each other and the second measurement object part, respectively, the position information acquiring means is individual unit identification apparatus of a circuit board according to note 1, wherein by measuring the relative position of the first measurement target portion and the second measurement object part per measurement object to obtain the location information.

(Supplementary Note 3) The position information acquisition unit calculates a difference between a position measurement unit that measures the position of the measurement target, and a measurement value of the measurement target measured by the position measurement unit and a design value of the measurement target. A difference calculation unit that performs the above calculation, and the difference calculated by the difference calculation unit is regarded as a point on the coordinate space, and the difference belongs to one of a plurality of divided regions obtained by dividing the coordinate space into a plurality of pieces in advance. And an area classification unit that acquires classification information for each measurement target, and the position information includes the classification information acquired by the area classification unit . individual body identification device.

(Supplementary Note 4) The registration unit registers in the storage means in association with the individual identification information before Symbol circuit board combination of the position information of the each target object acquired by the position information acquiring means, before SL circuit board individual identification apparatus searches the individual identification information before Symbol circuit board by collating the combination of the position information stored in conjunction with the storage means of the position information received from the position information acquiring means search means and, individual body identification system of a circuit board according to any one of appendices 1 to Appendix 3 further comprising output means for outputting the search result by the searching means.

(Supplementary Note 5) The position information acquisition unit, an image sensor that captures an appearance before Symbol circuit board, an image memory for storing the appearance image before Symbol circuit board captured by the image sensor, stored by said image memory has been pre-Symbol individual unit identification apparatus of a circuit board according to any one of Supplementary Notes 1 to Supplementary note 4 and an image measurement unit for measuring the position of the measurement target based on the appearance image of the circuit board.

(Supplementary Note 6) The measurement target, the through hole of the circuitry board, the land pattern, the resist opening, the wiring pattern, or silk pattern, or, in any one of Appendixes 1 to Appendix 5 is any combination individual unit identification apparatus for circuit board according.

(Supplementary Note 7) The position information acquisition means includes a measurement value of a relative position between a positioning reference hole formed in the circuit board and a location where a design coordinate position matches or is close to the positioning reference hole, and the positioning reference hole The difference between the design value of the relative position between the hole and the part is calculated, and the difference is used as a correction value, and includes a correction unit that corrects the measurement position of the measurement target . individual unit identification apparatus of the circuit board.

(Supplementary note 8) The circuit according to any one of supplementary notes 3 to 7, wherein the region classification unit classifies whether the difference belongs to a plurality of segmented regions obtained by segmenting orthogonal coordinates or polar coordinates into a plurality of segments in advance. board of individual body identification device.

(Additional remark 9) The said positional information acquisition means judges the presence or absence of the possibility of misjudging that the said difference belongs to the division area adjacent to the correct division area at the time of the area classification | category of the said difference by the said area classification | category part The location information includes the difference calculated by the difference calculation unit and misjudgment risk information indicating that the determination unit has determined that there is a possibility of erroneous determination. or individual unit identification device circuit board according to any one of appendices 7.

(Additional remark 10) The said search means is when the measurement object of mismatching exists when the combination of the said classification information received from the said positional information acquisition means and the combination of the said classification information memorize | stored in the said memory | storage means are collated. Even in the case where the classification areas are adjacent to each other between the non-matching measurement objects and the misjudgment risk information is added to the position information of the non-matching measurement objects, the non-matching classification information each other individual body identification system of a circuit board according to note 9, further comprising a determination unit viewed as consistent with each other.

(Supplementary Note 11) The retrieval means, compared to the case where the circuit board that matches are more searches, the difference between the all of the measurement object the erroneous determination risk information is added by the matching of the combination of the classification information and, individual unit identification apparatus of a circuit board according to note 10 square sum of XY components of the difference of the difference between further comprises a determination unit to refine the search results the minimum and name Ru circuit board.

(Supplementary Note 12) A procedure for measuring positions of a plurality of measurement targets on a circuit board and acquiring a difference between a measurement value of the measurement target and a design value of the measurement target as position information for each measurement target, and procedures and the including the circuit board of the individual unit identification method of registering a combination of the position information as the substrate identification code was.

DESCRIPTION OF SYMBOLS 10 ... Position information acquisition part 11 ... Position measurement part 11a ... Substrate supply stage 11b ... Image sensor 11c ... Image memory 11d ... Image measurement part 11e ... Imaging stage 11f ... Individual image memory 11g XY stage 12 Difference calculation unit 13 Area classification unit 20 Registration unit 30 Production information database 40 Search unit 50 Output unit 60・ ・ ・ Input receiving unit 100 ・ ・ ・ Circuit board 110 ・ ・ ・ Measurement object 111 ・ ・ ・ Through hole 111 a ・ ・ ・ Center of through hole 112 ・ ・ ・ Land pattern 112 a ・ ・ ・ Center of land pattern 113 ・ ・ ・Positioning reference hole

Claims (10)

The coordinate axes are shared, the positions of a plurality of measurement targets that cause deviation or variation in the processing position are measured on a circuit board, and the difference between the measurement values of the plurality of measurement targets and the design values of the plurality of measurement targets is measured. Position information acquisition means for acquiring as position information for the measurement object, and registration means for registering a combination of the position information acquired by the position information acquisition means as a substrate identification code,
The circuit board individual identification device characterized in that the plurality of measurement objects are any one of through holes, land patterns, resist openings, wiring patterns, silk patterns, or any combination thereof . The plurality of measurement objects each include a first measurement object part and a second measurement object part in which design coordinate positions on the circuit board coincide with each other or are close to each other,
2. The circuit according to claim 1, wherein the position information acquisition unit acquires the position information by measuring a relative position between the first measurement target unit and the second measurement target unit for each measurement target. A substrate identification device. The position information acquisition unit includes a position measurement unit that measures the position of the measurement target, and a difference calculation unit that calculates a difference between the measurement value of the measurement target measured by the position measurement unit and the design value of the measurement target. The difference calculated by the difference calculation unit is regarded as a point on the coordinate space, the difference is classified into a plurality of divided areas formed by dividing the coordinate space into a plurality of pieces, and the measurement is performed. Including an area classification unit that obtains classification information for each target,
3. The circuit board individual identification device according to claim 1, wherein the position information includes the classification information acquired by the region classification unit. 4. The registration unit registers the combination of the position information for each measurement target acquired by the position information acquisition unit in the storage unit in association with the individual identification information of the circuit board,
The circuit board individual identification device determines the individual identification information of the circuit board by collating the combination of the position information received from the position information acquisition unit and the combination of the position information stored in the storage unit. 4. The circuit board individual identification device according to claim 1, further comprising: search means for searching; and output means for outputting a search result obtained by the search means. 5.   The position information acquisition means includes an image sensor that captures an external appearance of the circuit board, an image memory that stores an external image of the circuit board captured by the image sensor, and the measurement object stored by the image memory. 5. The circuit board individual identification device according to claim 1, further comprising: an image measurement unit that measures a position of the measurement target based on an appearance image of the circuit board.   The measurement object is any one of a through hole, a land pattern, a resist opening, a wiring pattern, a silk pattern, or any combination of the circuit board. The circuit board individual identification device according to claim 1.   The position information acquisition means includes a measurement value of a relative position between a positioning reference hole formed in the circuit board and a location where a design coordinate position matches or is close to the positioning reference hole, and the positioning reference hole and the location. And a correction unit that corrects the measurement position of the measurement target using the difference as a correction value. The circuit board individual identification device according to claim 1.   The region classification unit classifies whether the difference belongs to one of a plurality of segmented regions obtained by segmenting orthogonal coordinates or polar coordinates into a plurality of segments in advance. The circuit board individual identification device according to Item. The position information acquisition unit further includes a determination unit that determines whether or not there is a possibility that the difference is erroneously determined to belong to a segmented region adjacent to a correct segmented region when the region classification unit classifies the difference.
The position information includes the difference calculated by the difference calculation unit and misjudgment risk information indicating that the determination unit has determined that there is a possibility of erroneous determination. The circuit board individual identification device according to any one of claims 3 to 7. On the circuit board , the coordinate axes are the same, a plurality of measurement objects that cause deviation or variation in the processing position are selected, the positions of the plurality of measurement objects are measured, and the measurement values of the plurality of measurement objects and the plurality of measurements are measured. A procedure for acquiring a difference from a target design value as position information for the plurality of measurement objects, and a procedure for registering a combination of the acquired position information for each of the plurality of measurement objects as a substrate identification code,
The circuit board individual identification method, wherein the plurality of measurement targets are any one of a through hole, a land pattern, a resist opening, a wiring pattern, a silk pattern, or any combination thereof .

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