JP4275541B2 - Wiring check method for printed wiring board, wiring check program for realizing this wiring check method, and recording medium recording this wiring check program - Google Patents

Description

  The present invention is used to compare the wiring contents with a circuit diagram at the time of designing a printed wiring board using CAD (cad), or to verify the correctness and work contents before and after the artwork editing work. The present invention relates to a wiring check method for a printed wiring board and a wiring check program for realizing the wiring check method.

  In general, at the stage of the artwork design, where the wiring routing of the printed wiring board is examined and designed, the wiring routing is compared with whether or not there is an error compared to the wiring represented on the original circuit diagram. Many CAD systems are equipped with a net comparison function as a means for determining whether or not the information regarding the connection relation of the wiring first input to the CAD is appropriate.

  As part of the CAD artwork editing function, the routed wiring pattern, the positions of the component lands and terminals, and the connection path data in the coordinate space virtually provided in the computer constituting the CAD system The net comparison function is realized by calculating the connection relation of the wirings using this function.

  However, this net comparison function compares the connection information that can be confirmed from the data after designing the artwork (that is, the artwork data) created based on the circuit diagram on the CAD system and the connection information used as the net. Therefore, it is assumed that an artwork is designed from a circuit diagram on one system, and the net comparison function is a function for circuit designers.

  On the other hand, the printed wiring board manufacturer also designs and edits artwork, but this is not a continuation of the circuit design performed by the circuit designer using the CAD system. The design and editing circumstances of the work are very different from each other.

  Specifically, information about circuit diagrams and information about components mounted on printed wiring boards are extremely handed over to the printed wiring board manufacturer from the circuit designer as a set along with artwork data. It is rare. In most cases, only the geometrical data of the conductor formed on the printed wiring board, which is the graphic data expressing the routing of the wiring with simple lines or arcs, is used as artwork data from the orderer to the printed wiring board. It is only passed to the manufacturer. In such a state, the manufacturer of the printed wiring board, in such a state, edits such as wiring routing and connection change instructed by the orderer of the printed wiring board, and editing work such as addition of plating leads necessary for manufacturing. , As well as other editing tasks.

  At this time, the problem is that there is a possibility that incorrect wiring is performed by these editing operations. For example, although the wiring A and the wiring B are originally independent patterns, there may be a problem that these wirings are connected due to an error in editing work. However, since there is no original circuit diagram or connection information, it is very difficult to check if such a mistake is made.

  As a countermeasure against such a problem, in some CAD systems, a function generally called reverse net extraction function is adopted. For example, a printed wiring board with a plating lead disclosed in Japanese Patent Laid-Open No. Sho 63-188267. A data inspection method for creating a pattern film has been proposed as a method for realizing the reverse net extraction function.

  This reverse net extraction function generally includes (1) that artwork data is composed of start and end coordinates of graphic elements such as arcs and straight lines, a line width called an aperture, and a vector having a shape, and (2) These start and end coordinates, line widths, and vectors have clear intersections and connection points with each other, and (3) data in photo format such that data indicating terminals and land portions is represented by flash data. On the premise that it has been created, it is a search for how the terminals and lands are electrically connected to each other.

  As an example of data indicating terminals and land portions created with the photo format data, data indicating land portions created with the photo format data will be described with reference to the drawings.

  FIG. 10 is an explanatory diagram showing an example of data indicating a land portion created with photo format data.

  Here, as shown, the first land 101, the second land 102, and the wiring 103 that connects the first land 101 and the second land 102 are arranged on the printed wiring board 100. Shown in the format.

  The first land 101 is a rectangular land having a length of 1 mm and a width of 2 mm, the second land 102 is an oval land having a major axis of 2.0 mm and a minor axis of 1.5 mm, and the wiring 103 is the first land 101. And a pattern with a line width of 0.5 mm bent in an L shape and connecting between the second lands 102.

  In terms of CAD data, the first land 101 is represented by flash data of a rectangular aperture having a length of 1 mm and a width of 2 mm, and the second land 102 has an elliptical aperture having a major axis of 2 mm and a minor axis of 1.5 mm. Expressed by flash data, the wiring 103 is expressed by linear graphic elements 103a and 103c and 1/4 arc-shaped graphic elements 103b using a circular aperture having a diameter of 0.5 mm. Although not described here, it goes without saying that the position of each graphic element (flash data, linear graphic element, arc-shaped graphic element) is expressed by coordinates on CAD.

The above-mentioned reverse net extraction function compares the connection paths before and after editing work by searching how the terminals and lands are electrically connected to each other using such photo-format data. It is verified whether the editing work was correct.
JP-A-63-188267 JP-A-5-324872

  However, the conventional reverse net extraction function has the following two problems.

  (1) When a pattern (graphic element) is expressed in a contour format, an inverse net cannot be extracted.

  (2) When terminals and lands are not represented by flash data, connection information related to the terminals and lands cannot be acquired. Also, it does not understand even if the pattern changes.

    The present invention has been made in view of the actual situation, and its purpose is to once rasterize artwork data and then graphic-process it to extract connection information to thereby vectorize the rasterized data again. Therefore, it is an object of the present invention to provide a wiring check method for a printed wiring board that can stably extract a net regardless of the original data form, and a wiring check program for realizing this wiring check method.

In order to solve the above problems, a printed wiring board wiring check method according to the present invention is a printed wiring board wiring check method that is performed when editing artwork related to wiring of a printed wiring board on a CAD. One graphic element is selected from a raster expansion process for rasterizing data onto a memory of a computer constituting a part of the CAD system, and an image indicated by the raster data obtained by raster expansion, and the center line of this graphic element is selected. It includes a centerline indexing step for indexing, a pin recognition step for recognizing the end point coordinates of the determined centerline as a pin, and a connection relationship search step for searching for a connection relationship between the recognized pins, and is subject to raster development. When the cad data is contour format data, it is composed of the closed curve indicated by this cad data. A raster development method is implemented which includes a step of performing inside / outside determination for each pattern, a step of rasterizing contour format data on a computer memory, and a step of filling the inside of a closed curve using the inside / outside determination result, A step of generating a virtual point in the vicinity of one of a plurality of graphic elements constituting a closed curve indicating a contour line of a pattern formed on a printed wiring board, and a horizontal line or a vertical line passing through the virtual point; For the intersections with all graphic elements constituting the closed curve indicating the contour of the pattern, the number of intersections between the virtual point and one end of the horizontal line or vertical line, and the horizontal line or vertical line from the virtual point Depending on the process of calculating the number of intersections between the edges and whether the calculated number of intersections is odd or even, the virtual point is inside the graphic element. Or or in which and a step of determining whether the outside.
In addition, when the cad data to be rasterized is data in a mixed format of photo format data and contour format data, the cad data is separated into a photo format data portion and a contour format data portion, after obtaining the photo format data and outline format data and two raster data are separately rasterized to be I der those containing a step of synthesizing the two raster data.

  In the above configuration, the raster development process, the center line indexing process, the pin recognition process, and the connection relation search process are performed before and after the artwork editing work to obtain two results, and these two results are obtained. For comparison, it may be confirmed whether the connection relationship has changed before and after the artwork editing work.

  The wiring check program of the present invention is for realizing any one of the above-described wiring check methods for a printed wiring board, and is provided by being recorded on a computer-readable recording medium or the like.

A printed wiring board wiring check method according to the present invention is a printed wiring board wiring check method that is performed at the time of editing artwork related to wiring of a printed wiring board on a CAD. Raster development process for raster development on a memory of a computer constituting the computer, a center line indexing process for selecting one graphic element from an image indicated by raster data obtained by raster expansion, and calculating a center line of the graphic element; Since it includes a pin recognition process that recognizes the end point coordinates of the calculated center line as a pin and a connection relation search process that searches for the connection relation between the recognized pins, the wiring check process can be performed mechanically. Compared with the conventional method, it can be checked quickly and reliably, and there is no circuit diagram or net information. But it is reliable wiring check by the net. Further, when the CAD data to be rasterized is contour format data, a step of performing inside / outside determination for each pattern constituted by the closed curve indicated by the CAD data, and the contour format data are stored in the computer memory. Since the raster development method includes the step of raster development above and the step of painting the inside of the closed curve using the inside / outside determination result, the pattern can be easily recognized. Still further, a step of generating a virtual point in the vicinity of one of the plurality of graphic elements constituting the closed curve indicating the contour line of the pattern formed on the printed wiring board, and a horizontal line passing through the virtual point or The number of intersections between the virtual point and one end of the horizontal line or the vertical line and the horizontal line or vertical from the virtual point with respect to the intersection of the vertical line and all graphic elements constituting the closed curve indicating the contour line of the pattern Depending on whether the number of intersections between the other ends of the line is calculated and whether the calculated number of intersections is odd or even, the virtual point is inside or outside the graphic element A process for determining whether or not there is a pattern, and thus a pattern can be easily extracted .
In addition, when the cad data to be rasterized is data in a mixed format of photo format data and contour format data, the cad data is separated into a photo format data portion and a contour format data portion, When the raster data is separately rasterized from the data in the photo format and the data in the contour format to obtain two raster data , the original data is included in the case of including a process of combining the two raster data. Regardless of whether the format is a photo format, a contour format, or a mixture thereof, reverse net extraction can be performed and wiring can be checked.

  Further, the raster development process, the center line determination process, the pin recognition process and the connection relation search process are performed before and after the artwork editing work to obtain two results, and these two results are compared to create an art. In the case of checking whether or not the connection relationship has changed before and after the work editing work, it can be reliably checked whether or not the connection relationship has changed before and after the artwork editing work.

  Since the wiring check program and recording medium of the present invention are for realizing any one of the above-described printed wiring board wiring check methods, the wiring check processing can be performed mechanically, compared with the conventional method. In addition, it can be checked quickly and reliably, and even if there is no circuit diagram or net information, it can be surely checked by the net.

  Embodiments of the present invention will be described below with reference to the drawings.

  Embodiment 1 of the present invention will be described below with reference to the drawings.

  FIG. 8 is an explanatory diagram showing an example of an image of artwork data held on the CAD before the artwork editing work is performed, and FIG. 9 is an instruction from the orderer of the printed wiring board and others. It is explanatory drawing which shows an example of the image of the artwork data currently hold | maintained on CAD after implementing artwork edit work based on the reason.

  In a state before the artwork editing work is performed, as shown in FIG. 8, the graphic elements arranged on the printed wiring board 10 are the first land 1, the second land 2, and the first land 1. And a single wiring 3 connecting the second land 2. The wiring 3 is composed of three linear graphic elements 3a, 3b, and 3c connecting the first land 1 disposed above and the second land 2 disposed below in the drawing. The linear graphic element 3 a is arranged so that the length direction is parallel to the vertical direction, and the upper end portion is connected to the first land 1. The straight graphic element 3 b is arranged so that the length direction is parallel to the left-right direction, and the left end is connected to the lower end of the first land 1. The straight graphic element 3c is arranged so that the length direction is parallel to the vertical direction, the upper end is connected to the right end of the straight graphic element 3b, and the lower end is connected to the second land 2. ing.

  Further, in the state after the artwork editing work is performed, as shown in FIG. 9, the graphic elements arranged on the printed wiring board 10 are the first land 1, the second land 2, and the first land. One wiring 13 connecting the land 1 and the second land 2. The wiring 13 includes ten linear graphic elements 13a, 13b, 13c, 13d, which connect between the first land 1 disposed above and the second land 2 disposed below in the drawing. 13e, 13f, 13g, 13h, 13i, and 13j. The linear graphic element 13 a is arranged so that the length direction is parallel to the vertical direction, and the lower end portion is connected to the first land 1. The linear graphic element 13b is arranged so that the length direction is parallel to the left-right direction, and the left end is connected to the upper end of the linear graphic element 13a. The linear graphic element 13c is arranged so that the length direction is inclined at a predetermined angle from the upper left to the lower right direction, and the upper end is connected to the right end of the linear graphic element 13b. The linear graphic element 13d is arranged so that the length direction is inclined at a predetermined angle from the upper right to the lower left direction, and the upper end is connected to the lower end of the linear graphic element 13c. The linear graphic element 13e is arranged so that the length direction is parallel to the vertical direction, and the upper end is connected to the lower end of the linear graphic element 13d. The straight graphic element 13f is arranged so that the length direction is parallel to the left-right direction, and the left end is connected to the lower end of the straight graphic element 13e. The straight graphic element 13g is arranged so that the length direction is parallel to the vertical direction, and the upper end is connected to the right end of the straight graphic element 13f. The straight graphic element 13h is arranged so that the length direction is parallel to the left-right direction, and the right end is connected to the lower end of the straight graphic element 13g. The immediately preceding graphic element 13i is arranged so that the length direction is parallel to the vertical direction, and the lower end is connected to the left end of the straight graphic element 13h. The immediately preceding graphic element 13j is arranged so that the length direction is parallel to the left-right direction, the right end is connected to the upper end of the straight graphic element 13i, and the left end is connected to the second land 2 Has been.

  Comparing the state before the artwork editing work and the state after the artwork editing work are compared, in either state, one wiring 3 or one wiring 13 is connected to the first land 1 and the second wiring. The land 2 is connected, and the connection relationship between the first land 1 and the second land 2 is not changed. However, since the route of the wiring 3 is changed to the route of the wiring 13, it cannot be determined at a glance whether the result after editing is correct. In FIG. 8 and FIG. 9, for the sake of explanation, patterns (that is, graphic elements arranged on the printed wiring board 10) are simplified. However, in an actual printed wiring board, a very large number of patterns are concentrated. In such a state, it is difficult and time-consuming to confirm a route change or the like by a method such as visual inspection.

  However, according to the present invention, reverse net extraction is performed by the procedure described below for the state shown in FIG. 8 before the editing work and the state shown in FIG. 9 after the editing work, respectively. By comparing two reverse net extraction results, it is possible to mechanically check that the connection status has not changed even after the editing work has been performed, which reduces labor and time, and as a result, the reliability of the check Is greatly improved.

  The wiring check method for a printed wiring board according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a flowchart showing an embodiment of a wiring check method for a printed wiring board according to the present invention. FIG. 2 is an explanatory diagram showing an example of a pattern used for explaining the wiring check method for the printed wiring board shown in FIG. For the sake of explanation, the number of patterns is very simplified to only two, but the reverse net extraction procedure of the wiring check method of the printed wiring board of the present invention is exactly the same for an actual printed wiring board including many wiring patterns. It can be implemented in the procedure.

  As shown in FIG. 2, the first pattern 4 and the second pattern 5 are arranged on the square printed wiring board 10. The first pattern 4 and the second pattern 5 are arranged in a state where they are adjacent to each other on the left and right side, and further, a strip-shaped graphic element disposed so that the length direction is parallel to the vertical direction, and the strip-shaped graphic element The shape is a combination of circular graphic elements arranged in a state where part of the upper end and the lower end overlap each other.

  In this embodiment, the data is created in a contour format. This contour format data is data in a format that expresses a closed curve that surrounds the outer periphery of the pattern using straight lines or arcs having no line width. Here, the closed curve is a conductor portion in a printed wiring board after completion. It shall be shown.

  First, first to fourth steps described below are performed to clean up data. These 1st process-4th process are the work performed in order to ensure that the closed curve which comprises a pattern is drawn with one stroke, and depending on the feature and state of data, these 1st process- Part or all of the fourth step can be omitted. On the other hand, if necessary, the first to fourth steps may be partially combined, or the first to fourth steps may be executed a plurality of times.

  In the first step, the coordinates of the arc are confirmed (step S1).

  In some CAD systems, data start and end points and center coordinates may be placed on a grid of units of several mm or several μm. Furthermore, an error with a certain width such as the number of significant digits in internal processing may be included. In Gerber, which is a general data format for transferring artwork data, arcs are represented by the coordinates of the start point, end point, and center, and these coordinates individually contain the above errors, so these The three coordinates are not necessarily matched in a trigonometric manner. Therefore, if the subsequent process is performed with such an error included, there is a possibility that an error will occur in the result. In this first step, the relationship between the start and end points of the arc and the center coordinates is recalculated. Take integrity.

  Specifically, in order to confirm trigonometric consistency, the end point is calculated using the start point coordinate P41, the center coordinate P42, and the angle (end angle) of the straight line L41 connecting the end point coordinate P43 and the center coordinate P42. The coordinate P43 is recalculated. As another method for confirming the trigonometric consistency, the start point coordinates are determined by using the angle (start angle) of the straight line L42 connecting the end point coordinates P43, the center coordinates P42, and the start point coordinates P41 and the center coordinates P42. There are methods such as recalculating P41.

  In the subsequent second process, the entire circle is processed (step S2).

  For those whose start and end angles are very close or the same and can be considered as a full circle, the data recognized as the data indicating the arc is recognized as the data indicating the full circle.

  In addition to the above-mentioned errors in the data, this processing is not possible with the Gerber format, which is a general data format for transferring artwork data, so all circles are arcs whose start point coordinates and end point coordinates match. Or the start point coordinate and the end point coordinate are expressed as very close arcs.

  Specifically, considering the start point coordinates, the end point coordinates, and the rotation direction of the arc, when the distance between the start point coordinates and the end point coordinates is within a predetermined range, it is regarded as a full circle.

  In the subsequent third step, the duplicate data and minute figure data are deleted (step S3).

  Here, an operation for collecting a plurality of arcs, straight lines, and whole circles regarded as a single figure into one within a certain allowable range is performed. This process is a process applied when, for example, the same data is written twice for some reason, or when a single straight line or arc is originally divided into a plurality of lines.

  Specifically, when they are connected to each other, when they intersect with each other and have actual intersections, or there is no actual intersection, they are very close and both are straight lines or arcs In the case of mutual, it is determined by whether or not the plurality of straight lines can be regarded as one straight line or arc within a predetermined error range.

  In addition, this processing includes collecting very short data, minute arcs or minute circles with adjacent data, and deleting data that can be safely deleted.

  In the subsequent fourth step, the connection point is confirmed (step S4).

  Here, it is confirmed whether or not the graphic element constitutes a closed curve.

Specifically, first, it is checked whether or not all graphic elements intersect each other. Next, if any one graphic element is taken out from the entire contour data, is there another graphic element having an end point at the same coordinate as the end point of this graphic element or another graphic element having an end point within a predetermined range? The process of searching whether or not is repeated, the arbitrary one graphic element is connected between the end points and another graphic element determined to have the end point by the search, and the graphic elements constituting the closed curve are grouped. Basically, a certain graphic element is connected at its end point to the end point of another graphic element and does not intersect with another graphic element. Accordingly, as a result of this grouping, all data belongs to any group, and therefore, the processing may be terminated when there is no graphic element that does not belong to any group. Conversely, if there is a graphic element that is not connected to another graphic element, it can be determined that an OPEN (open) error has occurred. If it is connected to multiple other graphic elements, a multi-branch error has occurred. If it intersects with another graphic element, it can be determined that a twist error has occurred.
If these errors occur (if the judgment result in step S11 is NO), correct the error by displaying an appropriate mark for the operator, for example, generating a mark at the end point of the related graphic element. Then, the process returns to the fourth step again and rechecks.

  If the determination result in step S11 is YES, the contour data cleaned up as the fifth step is raster-developed (step S5).

  A bitmap space having an appropriate resolution is prepared on the memory of a computer constituting a part of the CAD system so that the entire printed wiring board to be inspected can be accommodated. The contour data is raster-developed by drawing with a pixel-width line.

  The resolution of the bitmap, that is, how large one dot represents the actual data is determined by the effective number of CAD data, the minimum line width of the printed wiring board, the line interval, and the computer, OS (Operating System) and software. This is determined by considering various conditions such as the development environment of the wear. In general, it is selected within a range where the minimum line width and the minimum line interval are expressed by about 5 pixels or less, with less than the effective number of digits of the original CAD data. Then, one dot was considered as a square of 5 μm × 5 μm, and CAD data was developed as an image thereon. An image 20 in this state is shown in FIG. Here, the dots corresponding to the positions of the graphic elements 24 and 25 are black, and the other dots are white.

  Subsequently, a paint nucleus is created as a sixth step (step S6).

  In this step, it is determined whether the closed curve developed and created in the fifth step described above is black or white, and a pattern pattern is identified on the completed printed wiring board.

  Specifically, the following processing is performed for each group recognized as one closed curve in the above-described fourth step.

  First, one graphic element is arbitrarily selected from graphic elements grouped as graphic elements constituting one closed curve, and one point is virtually set in the vicinity thereof. The position of this point (hereinafter also referred to as “virtual point”) may be anywhere as long as it is separated from the selected graphic element by a distance sufficient for the subsequent inside / outside determination or raster painting process.

  For example, in the present embodiment, since the selected graphic element is the left straight line L24 constituting the first pattern 24 shown on the left side in FIG. 4, the original straight line (above-mentioned) A virtual point P20 was set at a position 30 microns away from the left straight line L24).

  If the selected graphic element is an arc, a virtual point is set at a position slightly away from the original arc on a straight line connecting the midpoint of the arc and the center of the arc. In addition, the extent to which the virtually set point is separated from the original straight line is not less than 3 times the size of one dot of the bitmap, and not more than 1/3 between the minimum line width and the minimum line of the printed wiring board It can be determined using the distance around as a guide. If the selected graphic element is a full circle, the center of the full circle may be a virtual point.

  Next, assuming the horizontal line L20 passing through the virtual point, the actual intersection coordinates (P24a, P24b, P25a, P25b) with all the graphic elements including the graphic elements (the first pattern 24 and the second pattern 25) selected as described above. Calculate In this calculation, if the solution at the intersection is indefinite, that is, if the graphic element overlaps the assumed horizontal line, the virtual point P20 is moved, or it is set again near another graphic element, Alternatively, the intersection calculation is performed again using a vertical line instead of a horizontal line.

  When all intersections are found as actual intersections, the coordinates of each intersection are checked to determine whether there are any objects that are very close to each other. This is because it is usually unthinkable that there are intersections closer than the minimum line width and minimum line of the wiring board, and there may have been mistakes in deleting previous duplicated data, correcting gaps, and correcting intersections. Because there is. If there is no error here, the number of intersections on the right and the number of intersections on the left from the virtual point are counted.

  Here, assuming that the outside of the printed wiring board is a portion without a pattern, if both the left and right sides are odd, this virtual point P20 is inside the closed curve indicating the outer shape of the selected graphic element, that is, after completion. On the other hand, if the left and right are even numbers, the virtual point is outside the closed curve indicating the outer shape of the selected graphic element, that is, the printed wiring board after completion. It can be judged that the part which is not a conductor is shown.

  If the odd and right are different on the left and right, it is determined that there was an error because there was a possibility that there was a mistake in the previous deletion of duplicate data, gap correction or intersection correction (in step S12). The determination result is NO), and the process returns to the third step described above.

  On the other hand, when the number of intersection points is an odd number, the virtual point is set as a filling nucleus of the closed curve. Also, if the number of intersections is an even number, a proximity point is generated using the horizontal line used to determine the intersection, the already calculated intersection coordinates, and the relationship of the original graphic element that generated the proximity point. In the same way as above, create a point in the closed figure and use it as the fill kernel.

  As a premise of the above processing, it is assumed that the pattern image to be processed is a positive image and the outermost periphery of the printed wiring board is a portion without a conductor.

  If the outer side is a conductor, the relationship between the even number and the odd number of the intersection points and the fill kernel is reversed in the above-described process.

  The above procedure is performed on the fully closed curve to create a fill kernel for the fully closed curve.

  If the decision result in the step S12 is YES, subsequently, painting is executed as a seventh process (step S7).

  A position on the bitmap corresponding to the coordinates of the filling nucleus (the position of the virtual point P20 in FIG. 4) is confirmed, and Fill-paint (fill painting) is executed with the position as the star point. This process is carried out just like a coloring book, with the dot color until it hits a closed curve that looks in all directions from the starting point and forms the contour of the raster rasterized pattern in the previous process. Change from white to black. FIG. 5 shows an image (first pattern 24 and second pattern 25) in a state where the filling is completed in this way.

  Subsequently, a synthesis process is performed as an eighth step.

  If the pattern data is made up of a plurality of files, for example, if the pattern data is made up of two files, that is, a pattern and extracted data, the process up to the seventh step is performed for each pattern data. It is performed individually to form two pieces of data in a state where the filling has been completed, and thereafter, these two data are synthesized at this stage.

  Thus, the reverse net extraction process is performed.

  Thinning is performed as the ninth step.

  First, the bitmap data is thinned. This step is a process for obtaining the center line of the pattern obtained as a filled figure. Specifically, along the black-and-white boundary of raster data (data obtained by raster development), the connection and position of each dot with the adjacent dot so that the black dot is peeled off. While judging the relationship, the dot is changed to a white dot, and finally a center line composed of a line having a width of 1 dot is obtained. FIG. 6 shows a state in which the thinning is completed and the center line L1 of the first pattern 24 and the center line L2 of the second pattern 25 are obtained.

  In the thinning process, a part of the pattern may have a width of one dot earlier than the other part. It is important to process such a portion so that it is not interrupted or shortened in the process of continuously thinning the other portions. This is particularly important when processing pattern edges and terminal portions. If this is not sufficient, the PIN position may change, which may interfere with subsequent net comparisons.

  Next, endpoints and connections are detected as a tenth step.

  If thinning has been achieved in the ninth step, the end points of the center lines L1 and L2 are set as PINs (pins), and their coordinates are read out. For example, as shown in FIG. 7, the upper end point of the center line L1 is PINP1, the lower end point of the center line L1 is PINP2, the upper end point of the center line L2 is PINP3, and the lower end point of the center line L2 is PINP4.

  Next, the connection relationship between each PIN is read by following the connection of black dots, and a list (see Table 1) indicating which PIN is connected to which PIN is created.

この表１が、求める逆ネットである。このリストには、ＰＩＮ名（Ｐ１，Ｐ２，Ｐ３，Ｐ４）と、各ＰＩＮのＸ座標（Ｘ１，Ｘ２，Ｘ３，Ｘ４）と、各ＰＩＮのＹ座標（Ｙ１，Ｙ２，Ｙ３，Ｙ４）と、各ＰＩＮの接続先ＰＩＮ名（Ｐ２，Ｐ１，Ｐ４，Ｐ３）とが示されている。

Table 1 is a reverse net to be obtained. This list includes a PIN name (P1, P2, P3, P4), an X coordinate (X1, X2, X3, X4) of each PIN, a Y coordinate (Y1, Y2, Y3, Y4) of each PIN, Connection destination PIN names (P2, P1, P4, P3) of each PIN are shown.

  The work consisting of the above-mentioned first to tenth steps is performed before and after the artwork editing work, and two lists showing reverse nets (a table showing the state before the artwork editing work and a list after the artwork editing work) A table showing the status) and comparing these two lists.

  Then, the two tables are compared based on the coordinate position of each PIN, and if the connection relationship is the same, it can be confirmed that the connection has not been changed by editing. Note that when the shape, size, and line width of the terminal portion and the like are changed, the PIN coordinates may be slightly shifted due to the thinning process even if the connection relationship does not change. In addition, when the terminal position is moved by intentional editing, the PIN coordinates naturally change, but it goes without saying that the comparison is performed in consideration of the reverse net comparison before and after editing.

  The printed wiring board wiring check method of this embodiment applies the printed wiring board wiring check method described in the first embodiment to the photo format data when the artwork data is photo format data. It was implemented.

  Since the data in the photo format already has a line width and shape, complicated clean-up and rasterization as in the first embodiment are not necessary. Simply, a bitmap space corresponding to the size and definition of the wiring board is prepared, and rasterization (raster development) is performed with the line width and shape of the aperture.

  When this rasterization is performed, an image similar to that shown in FIG. 5 referred to in the first embodiment is obtained. Therefore, the subsequent processing is performed by applying the printed wiring board wiring check method of the first embodiment. If implemented, the reverse net can be extracted.

  If the original pattern data is a mixture of photo format and contour format, first divide the data into photo format portion and contour format portion. The rasterization is performed by applying the wiring check method of the printed wiring board of Example 1, and the rasterization is applied to the photo format data by applying the wiring check method of the printed wiring board of this embodiment. When the conversion is completed, raster composition is performed. Then, the reverse net may be extracted by applying the wiring check method for the printed wiring board according to the first embodiment and executing the processes after thinning.

  Also, the wiring check program of the present invention realizes the printed wiring board wiring check method shown in the first and second embodiments, and this wiring check program is stored in a computer-readable recording medium. In this state, it is incorporated and used in a computer constituting a part of the CAD system.

  The wiring check method for a printed wiring board and the wiring check program for realizing the wiring check method of the present invention can be used at the time of designing a printed wiring board used for electronic equipment by CAD.

It is a flowchart which shows one Example of the wiring check method of the printed wiring board of this invention. It is explanatory drawing which shows an example of the pattern used when implementing the wiring check method of the printed wiring board shown in FIG. It is explanatory drawing which shows an example of the image after the raster expansion | deployment obtained by implementing the process of raster-developing the outline data shown in FIG. It is explanatory drawing which shows an example of the image which showed the virtual point obtained by implementing the process of creating the filling nucleus shown in FIG. It is explanatory drawing which shows an example of the image after the filling obtained by implementing the process of performing the filling shown in FIG. It is explanatory drawing which shows an example of the image which showed the centerline obtained by implementing the process of performing thinning shown in FIG. It is explanatory drawing which shows an example of the image which showed the end point of the centerline obtained by implementing the process of detecting the end point and connection shown in FIG. It is explanatory drawing which shows an example of the image of the artwork data currently hold | maintained on CAD before implementing an artwork edit operation | work. It is explanatory drawing which shows an example of the image of the artwork data currently hold | maintained on CAD after implementing an artwork edit operation | work. It is explanatory drawing which shows an example of the data which shows the land part produced with the data of the photo format.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st land 2 2nd land 3,13 Wiring 4 1st pattern 5 2nd pattern 10 Printed wiring board

Claims (5)

On the CAD, a printed wiring board wiring check method that is carried out when editing artwork related to wiring of the printed wiring board,
A raster development process for rasterizing artwork data onto the memory of a computer that forms part of the CAD system, and one graphic element is selected from the image indicated by the raster data obtained by raster expansion, and the center of this graphic element is selected. A center line indexing step for determining a line, a pin recognition step for recognizing the end point coordinates of the determined center line as a pin, and a connection relationship search step for searching for a connection relationship between the recognized pins,
When the CAD data to be raster-developed is contour format data, the CAD data indicates the inside / outside determination for each pattern composed of closed curves, and the contour format data is stored in the computer memory. A raster development method comprising a raster development step and a step of painting the inside of the closed curve using the inside / outside determination result,
A step of generating a virtual point in the vicinity of one of a plurality of graphic elements constituting a closed curve indicating a contour line of a pattern formed on a printed wiring board, and a horizontal line or a vertical line passing through the virtual point; For the intersections with all graphic elements constituting the closed curve indicating the contour of the pattern, the number of intersections between the virtual point and one end of the horizontal line or vertical line, and the horizontal line or vertical line from the virtual point Whether the virtual point is inside or outside the graphic element, depending on the process of calculating the number of intersections to the edge and whether the calculated number of intersections is odd or even And a wiring check method for a printed wiring board including a step of determining. When the cad data to be rasterized is mixed data of photo format data and contour format data, the cad data is separated into the photo format data portion and the contour format data portion, and the photo format 2. The printed wiring board wiring check method according to claim 1, further comprising the step of raster-developing the data of the above and the contour format data separately to obtain two raster data, and then combining the two raster data . The raster development process, centerline determination process, pin recognition process and connection relation search process are performed before and after the artwork editing work to obtain two results, and the two results obtained are compared to edit the artwork. The wiring check method for a printed wiring board according to claim 1 or 2, wherein it is confirmed whether or not the connection relationship has changed before and after the work . A wiring check program for realizing the wiring check method for a printed wiring board according to claim 1, 2 or 3. A computer-readable recording medium on which the wiring check program according to claim 4 is recorded.

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