JP2008310573A - Display method for cad drawing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display method for a CAD (Computer Aided Design) drawing allowing positive confirmation of a component arrangement position when displaying the component in another CAD drawing, in displaying the CAD drawing comprising a plurality of components. <P>SOLUTION: A board design CAD decides whether an index of the component 14 overlaps an index of another component or not when displaying a mounting graphic based on a read component list, performs normal display when they do not overlap, displays only a reference 15 of the component by pop-up display when they overlap, and pop-up displays all pieces of data of the component 14 when the component 14 is indicated. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a CAD drawing display method for displaying reference and character / symbol information about a part as a subscript of a part based on design CAD information and read information when a plurality of parts are displayed on a predetermined CAD drawing. About.

In electronic devices using printed wiring boards, downsizing is required, and the size of printed wiring boards on which components are mounted is limited accordingly, and silk printing such as references representing parts is omitted, simplified, and component mounting Due to reasons such as high density, miniaturization of parts, and dense density of silk printing, it is becoming difficult to grasp the placement position after mounting components, and it is extremely difficult when working with reference to circuit diagrams such as debugging work and repair work. It took a long time.
JP 2006-294926 A JP 2006-303242 A

  In order to solve such problems, the component outline silk and the mounting diagram showing only the reference are used to check the location of the parts on the high-density mounting board and silkless (including part of the referenceless) board. However, since the point of searching for a target part from a huge number of parts does not change, it takes a very long time.

  The purpose of searching for parts is to examine the circuit diagram when checking the function of the circuit or repairing it, and to search for the target part on the actual board, when it is actually used, if a problem occurs, or part failure In some cases, when a mounting problem occurs, which part of the circuit is affected is examined. That is, there are a case where one wants to know where the component on the circuit diagram is mounted on the actual board and a case where one wants to know where the mounted component is used on the circuit diagram.

  Therefore, in Patent Document 1, a circuit diagram in which the XY code of the mounting area is added to the end of the component number of the circuit diagram is created, and the position information of the mounted component is displayed on the circuit diagram. Further, in Patent Document 2, the position information of the mounted component is displayed on a circuit diagram, and the component display position on the circuit diagram is displayed around the reference on the substrate.

However, since the thing of patent document 1 only responds | corresponds to the component position on a board | substrate from a circuit diagram, it cannot know where the component used on the circuit diagram is used from a board | substrate.
Further, in the case of Patent Document 2, it is a proposal that was considered because the discrimination of components became very difficult due to the high density of component mounting on the substrate and the miniaturization of the components. It is not realistic to display the above information. In other words, even the reference is difficult to display at present, and is a solution that cannot be implemented.

  For example, when a mounting board is displayed with a board design CAD, for example, a component reference and a component placement position when the component is displayed on the circuit design CAD may be displayed as a subscript of the component. When the parts are dense, the subscripts overlap with the subscripts of other parts, which causes a problem that the position of the part cannot be confirmed.

  The present invention has been made in view of the above circumstances, and its purpose is to reliably confirm the arrangement position when a part is displayed on another CAD drawing when displaying a CAD drawing composed of a plurality of parts. An object of the present invention is to provide a method for displaying a CAD drawing.

  According to the first aspect of the present invention, when a CAD drawing consisting of a plurality of parts is displayed, if the subscripts of the parts do not interfere with each other, the reference assigned to the part based on the read information and the part are changed. Since the character / symbol information indicating the arrangement position of the component when displayed on the CAD drawing is displayed as the subscript of the component, it is possible to confirm where the component is used in other CAD drawings. In this case, when the character / symbol information between the components interferes with each other, only the reference is displayed, so that the CAD drawing is not difficult to see. In addition, when a part is designated, character / symbol information indicating the position of the part is displayed in a pop-up so that the position of the part in another CAD drawing can be known by the display.

  According to the invention of claim 2, when a component failure, malfunction or mounting problem occurs, the position of the target component is located on the circuit diagram only by looking at the mounting diagram by the board design CAD. Since it can be grasped, the position of the component on the circuit diagram can be easily searched, and it can be confirmed how the component affects the operation.

According to the third aspect of the present invention, it is possible to avoid the influence caused by the interference of the subscripts of the parts even when the display of the mounting drawing is enlarged or reduced.
According to invention of Claim 4, since a display can be switched arbitrarily, it is excellent in usability.

  According to the invention of claim 5, since a printed wiring board, a silkless board, and a part of reference silk having a high component mounting density cannot be put, circuit designers, experiments, surveys, and measurements can be performed even on the omitted boards. Since the person who performs the process can grasp the position of the target component on the printed wiring board only by looking at the circuit diagram, the position of the mounted component can be easily found.

According to the sixth aspect of the present invention, even when the display of the circuit diagram is enlarged or reduced, it is possible to avoid the influence caused by the interference of the subscripts of the parts.
According to invention of Claim 7, since a display can be switched arbitrarily, it is excellent in usability.

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 2 schematically shows a process until the mounting substrate is completed. As shown in FIG. 2, a mounting substrate is completed by sequentially executing a design process, a manufacturing process, and a mounting process. In the design process, a circuit diagram is created by a circuit design CAD (Computer Aided Design) operating on the computer 1. This circuit design CAD is a CAD for assisting the operator in circuit design. When the circuit diagram input is completed, various data such as a general-purpose data format circuit diagram, net list, and component list are stored. It can be stored in a medium or output to the outside via a communication line.

  Further, in the design process, the printed wiring board is arranged and wired by the board design CAD operating on the computer 2. This board design CAD can read the data output from the circuit design CAD from a storage medium or receive it via a communication line. Based on the read data, the parts are arranged on the mounting board, and manual wiring or A pattern can be formed on the mounting board by partially automatic wiring. The board design CAD outputs photo data (film drawing data) and mount data (coordinate data) necessary for creating the printed wiring board when the creation of the mounting drawing is completed.

  The circuit design CAD and the board design CAD may operate on the same computer. However, when the circuit design and the board design are operated in different factories or places, the computer and the board design on which the circuit design CAD operates. It is different from the computer 2 on which CAD operates. In this embodiment, a CAD system is configured by circuit design CAD and substrate design CAD.

In the board manufacturing factory, the printed circuit board is manufactured by editing the manufacturing data based on the photo data created by the board design CAD.
In the component mounting factory, a mounting board is manufactured by mounting components on a printed wiring board manufactured by a board manufacturing factory based on mount data output by the board design CAD.

FIG. 3 shows a data flow when a printed wiring board is manufactured. In FIG. 3, when the circuit design is completed, the circuit design CAD 3 creates and outputs a circuit diagram 4, a net list 5, and a parts list 6.
The circuit design CAD 3 is configured by integrating a simulator, a netlist (connection information) generation program, a mapping program, a circuit optimization program, a cell library, a circuit diagram creation program, and the like. Among them, the circuit diagram creation program (circuit diagram editor) generates a circuit diagram (hierarchical diagram) having a hierarchical structure.

  Symbol coordinates indicating components (circuit elements such as transistors, diodes, resistors, capacitors, comparators, ICs, circuit blocks, etc.) in each hierarchical drawing are in a separate file as symbol information. This symbol information also includes the sheet area coordinates of each hierarchical drawing. The symbol information and the drawing data are generated by calling a circuit diagram creation program when necessary.

The circuit design CAD 3 generates and outputs hierarchical drawing display data based on drawing data including hierarchical information, symbol information, and drawing data.
FIG. 4 shows an example of a screen display when the hierarchical drawing display data generated by the circuit design CAD 3 is output on a display (display means). As shown in FIG. 4, in the circuit diagram 4, each component 8, which is a single element, such as an IC, a diode, a resistor, and a capacitor, is displayed with symbols. These single elements are displayed on the circuit diagram by developing a circuit block (not shown). In this case, the reference 9 and the arrangement information (corresponding to subscripts and character / symbol information) 10 as related information are displayed on the component 8 as subscripts.

  The circuit diagram 4 is composed of a plurality of hierarchical drawings, and a lower layer circuit diagram can be displayed by an operation on the circuit design CAD 3. That is, the circuit design CAD 3 extracts the association between the functional circuit block displayed as one circuit element in each hierarchical drawing and the lower hierarchical drawing in which the functional circuit block is expanded based on the hierarchical information. The hierarchical circuit diagram 4 shown in FIG. 4 can be displayed by generating the hierarchical structure data (bookmark).

  When browsing a desired drawing, when a pointer is placed on a desired functional circuit block and clicked on a higher-level circuit diagram (not shown), a lower circuit diagram 4 is displayed on the screen. In addition, when a “back” button (not shown) is clicked in the lower circuit diagram 4, the screen display of the upper circuit diagram can be returned. If detailed information cannot be confirmed on the whole display, detailed information can be confirmed using an enlargement function described later, and the hierarchical structure can be confirmed in the “bookmark” column. In addition, a desired drawing can be printed using the printing function.

When the circuit design is completed by the circuit design CAD 3, the operator stores various data in a storage medium or outputs the data to a board design factory through a communication line.
Returning to FIG. 3, the board design CAD 11 is configured such that a plurality of programs operate in cooperation with the circuit design CAD 3, and various data output from the circuit design CAD 3 and independent management component arrangement information 7. The placement and wiring of the printed wiring board is performed based on the above. The operator inputs board information when the printed circuit board is arranged and wired by the circuit design CAD 3. This substrate can arbitrarily display the front surface and the back surface, and can display an enlarged or reduced portion at any location. When the operator selects a desired part with the front or back side of the board displayed and clicks on an arbitrary position, the board design CAD 11 displays an outline drawing corresponding to the part selected from the part file on the mounting diagram 12. To do. At this time, since the displayed component is displayed in the initial state registered in the component file, the printed wiring board is arranged and wired by rotating or moving the component as desired.
When there is no part in the part file, the operator can register the outline of the part in the part file.

  FIG. 5 shows an example of the mounting diagram 12 displayed by the board design CAD 11. In FIG. 5, an external view of the component 14 is displayed on the printed wiring board 13 in the mounting diagram 12. In this case, a reference (corresponding to a subscript) 15 that is related information is displayed on the component 14. Accordingly, the operator can place the component 14 while confirming the name of the component 14. When the placement of the component 14 is finished, manual wiring or partial automatic wiring of the pattern is performed on the board design CAD 11.

  When manual wiring or partial automatic wiring is performed, the board design CAD 11 generates a pattern for connecting the terminals of the components 14 based on the netlist 5 input from the circuit design CAD 3. As this manual wiring or partial automatic wiring, in addition to generating a pattern on the inner layer of the printed wiring board, a through hole for connecting patterns of different layers is generated. If there is a part that cannot be routed as a result of manual wiring or partial automatic wiring, the operator can change the design by changing the placement of the part or setting a jumper line. Perform some automatic wiring again.

The operator can store the photo data 17 and the mount data 18 in a storage medium when a component is mounted on the printed wiring board 13 and manual wiring or partial automatic wiring is completed by the board design CAD11, or the board is manufactured through a communication line. Output to factories and component mounting factories. The photo data 17 is created in a data format called a general-purpose GERBER format, for example. The mount data 18 is created in the format of a component mounting factory for mounting components on a printed wiring board.
As described above, the circuit design CAD3 and the board design CAD11 can be used to create data necessary for manufacturing the mounting board.

Also, when a problem occurs during actual use after shipping a product, or when a component failure or mounting problem occurs, it may be checked which part of the circuit is affected. That is, there is a case where it is desired to know where the mounted component is used on the circuit diagram 4.
In such a case, the operator reads the component list 6 output from the circuit design CAD3 into the board design CAD11.

  FIG. 6 shows an example of the parts list 6. In FIG. 6, the parts list 6 includes “Ref” (reference), “Part” (parts), “Page” (page), and “Address” (placement coordinates) corresponding to “NO.”. ing. “Ref” is a name given to the part, “Part” is the actual name of the part, “Page” is the page of the circuit diagram shown in FIG. 4, and “Address” is the circuit diagram shown in FIG. The component placement coordinates.

  When displaying the actual board 12 for verifying the mounting board, the board design CAD 11 indicates the display page and coordinates on the circuit diagram 4 in addition to the reference 15 constituting the read component list 6. The arrangement information 10 is displayed as a subscript. At this time, the board design CAD 11 determines whether the subscripts of the components 14 interfere with each other prior to displaying the components 14, and displays them as they are when they do not interfere. On the other hand, when the subscripts of the parts 14 interfere with each other, only the reference 15 is displayed as the subscript of the parts. Thereby, the subscripts of components can be displayed without interfering with each other. When the cursor is placed on the component 14 whose subscript interferes, all the data of the component list 6 corresponding to the component 14 is displayed in a pop-up manner.

  FIG. 1 is a diagram for explaining an operation in which the board design CAD 11 executes normal display or pop-up display based on the determined result. Note that the determination before display shown in FIG. 1 is a diagram for explaining how to determine whether subscripts of parts interfere with each other, and is not actually displayed.

  Further, when verifying the arrangement of the components 14 in the board design CAD 11, a predetermined area in the drawing may be enlarged or reduced. When enlarging / reducing the drawing in this way, the board design CAD 11 determines whether or not the subscript of the component 14 interferes before enlarging / reducing the predetermined area, and if not, normally displays it. In this case, when enlarging / reducing the predetermined area, in addition to the reference 15 as a subscript indicating the component 14, arrangement information (corresponding to the subscript, character / symbol information) 16 indicating the display page, coordinates and the like on the circuit diagram 4 It is supposed to be displayed. Even if the predetermined area is enlarged / reduced, the size (font) of the subscript of the component 14 is not changed. Thus, the operator can easily check against the printed circuit diagram 4 parts.

  If the subscripts of the component 14 do not interfere when the enlarged display is performed, the normal enlarged display is performed. That is, as the subscript of the component 14, the reference 15, the display page on the circuit diagram 4, and the arrangement information 16 such as coordinates are displayed. In this normal display, a “normal” button (corresponding to the switching means) 19 and a “Pupup” button (corresponding to the switching means) 20 are displayed, and the pop-up display described later can be selected by the operator.

  On the other hand, when it is determined that the subscript of the component interferes with the determination before display (indicated by a circled area in FIG. 1), all the data of the component list 6 is displayed in a pop-up manner. In this pop-up display, only the reference 15 is displayed as the subscript of the component 14, and when the cursor is placed on the component 14, all the data of the component 14 is displayed in a pop-up display. The display contents of the pop-up display are “reference, component outline, comment, model, mounting position coordinate, arrangement surface, display page on the circuit diagram, coordinates”.

  The example shown in FIG. 1 shows a case where the cursor is placed on the IC 5, the IC 5 is a buffer IC, the model is TC74HC151, and is mounted at coordinates “55.05, 67.15” on the A surface of the printed wiring board. 4 shows that the coordinates are displayed at the coordinates C2 of 1/30 page on the circuit diagram 4. As a result, the operator can obtain information on components necessary for verifying the arrangement of components in the board design CAD 11.

  FIG. 7 is a flowchart schematically showing the operation of the board design CAD 11 described above. As shown in FIG. 7, when displaying the mounting diagram 12, it is determined whether or not there is character interference with another component 14. When there is no interference, normal display is performed, and when there is interference, a pop-up is performed. Execute the display. Moreover, the normal display and the pop-up display can be manually switched.

  Accordingly, when a component failure, malfunction or mounting problem occurs, the circuit design can be obtained by simply looking at the mounting diagram 12 using the board design CAD 11 so that the target component is located on the circuit diagram. 4 can easily find the position of the part, and it can be confirmed how the part affects the operation.

  On the other hand, when checking the function of a circuit or refurbishing, it may be examined on the circuit diagram 4 and a target part may be searched on an actual board. That is, there are cases where it is desired to know where the components on the circuit diagram 4 are mounted on the actual board.

When examining the circuit, the operator causes the circuit design CAD 3 to read the mount data 18 output from the board design CAD 11.
The circuit design CAD 3 includes “reference”, “constant”, “component outline, comment, etc.”, “model, manufacturer”, “mounting position coordinates, placement surface” among the read mount data 18. “Constant” and “Mounting position coordinates, arrangement surface” are displayed as subscripts of the component. At this time, when the subscripts of the parts interfere with each other, only the reference is displayed, and when the cursor is placed on the part, all of the data of the part is displayed in a pop-up manner. The display contents of this pop-up display are “reference, constant, component outline, comment, model, manufacturer, mounting position coordinate, arrangement surface”.

  When verifying the arrangement of the parts 8 in the circuit design CAD 3, a predetermined area in the drawing may be enlarged or reduced. In this way, when enlarging / reducing the drawing, the circuit design CAD 3 determines whether or not the subscripts of the components interfere before enlarging / reducing the predetermined area, and normally displays if there is no interference. In this case, when the predetermined area is enlarged / reduced, a constant, a mounting position coordinate, and an arrangement surface are displayed in addition to the reference 9 as a subscript indicating the component 8. Accordingly, the operator can easily check against the component 14 on the printed mounting diagram 12. Even if the predetermined area is enlarged / reduced, the size (font) of the subscript of the component 8 is not changed.

FIG. 9 is a diagram for explaining an operation in which the circuit design CAD 3 executes normal display or pop-up display based on the determined result. Note that the determination before display shown in FIG. 9 is a diagram for explaining how to determine whether the subscripts of the component 8 interfere with each other, and is not actually displayed.
As shown in FIG. 9, when the subscript of the component 8 does not interfere with the enlarged display, the normal enlarged display is performed. That is, as a subscript of the component 8, a reference, a constant, a mounting position coordinate, and an arrangement surface are displayed. In this normal display, a “normal” button 19 and a “Pupup” button 20 are displayed, and the operator can select a pop-up display.

On the other hand, when it is determined that the subscript of the component 8 interferes in the determination before display (indicated by the area surrounded by an ellipse in FIG. 9), all the data of the mount data 18 are displayed in a pop-up manner. The flowchart of the operation of the circuit design CAD 3 is the same as the operation of the board design CAD 11 shown in FIG.
As described above, in the circuit design CAD 3, while confirming the circuit diagram 4 displayed on the basis of the mount data 18 output from the board design CAD 11, the function check and the repair work of the circuit are performed on the actual board.

  Therefore, printed circuit boards with high component mounting density, silkless boards, and some reference silk cannot be inserted. By simply looking at 4, it is possible to grasp where the target component is on the printed wiring board, so that the position of the mounted component can be easily found.

  According to such an embodiment, when the CAD drawing is displayed in the circuit design CAD 3 and the board design CAD 11, if the component subscript does not interfere with the display of other component subscripts, the reference and the component are different as normal displays. Arrangement information 10 indicating the arrangement position when displayed on a CAD drawing is displayed. When there is interference, only a reference is displayed as a pop-up display, and when a part is instructed, all the data of the part is pop-up displayed. Therefore, when displaying a CAD drawing composed of a plurality of parts, it is possible to easily confirm the arrangement position when the part is displayed on another CAD drawing, and design correction by circuit design CAD and board design CAD can be performed. It can be done smoothly.

Further, when the normal display is performed, the buttons 19 and 20 for switching between the normal display and the pop-up display are displayed, and the normal display and the pop-up display are arbitrarily switched by an operation on them, so that it is easy to use. Yes.
Furthermore, by outputting the data of the circuit diagram 4 and the mounting diagram 12 in a general-purpose format, even when using a personal computer that does not have a design environment assumed as a situation at the time of use, the confirmation work can be performed smoothly. .

(Modification)
The present invention is not limited to the above embodiment, but can be modified or expanded as follows.
The display contents to be displayed in a pop-up may be only component arrangement information, or may be arbitrarily selected from the component list 6 or the mount data 18.
In normal display, the remaining information that is not displayed may be displayed in a pop-up manner.

The figure for demonstrating the display judgment operation | movement of circuit design CAD in one Example of this invention. Diagram showing board manufacturing process Diagram showing the flow of data when manufacturing a board Diagram showing circuit diagram Diagram showing mounting diagram Figure showing parts list Flowchart showing display design CAD display judgment operation Diagram showing mount data FIG. 1 equivalent diagram showing the display judgment operation of the board design CAD

Explanation of symbols

  In the drawings, 1 and 2 are computers, 3 is a circuit design CAD, 4 is a circuit diagram, 6 is a parts list, 8 is a part, 9 is a reference (subscript), 10 is arrangement information (subscript, character / symbol information), 11 Is a board design CAD, 12 is a mounting diagram, 13 is a printed wiring board, 14 is a component, 15 is a reference (subscript), 16 is arrangement information (subscript, character / symbol information), 18 is mount data, and 19 is “normal”. Buttons (switching means) and 20 are “Poppup” buttons (switching means).

Claims (7)

When a CAD operating on a computer displays a plurality of parts on a predetermined CAD drawing, the reference assigned to the part based on the read information and the part displayed on a different type of CAD drawing A CAD drawing display method for displaying character / symbol information indicating the arrangement position of the component in as a subscript of the component,
When displaying the CAD drawing, the CAD displays the reference and the character / symbol information as a normal display if the subscript does not interfere with the display of the subscript of another part, and displays a pop-up display if there is an interference. And displaying only the reference and popping up all the character / symbol information when the part is designated. The CAD is a board design CAD that reads a part list of a predetermined format output from the circuit design CAD as the character / symbol information,
2. The CAD drawing display method according to claim 1, wherein the board design CAD displays the CAD drawing as a mounting drawing.   The board design CAD re-determines the presence or absence of interference in a state where the character / symbol information is excluded from the object of enlargement / reduction when the display is enlarged / reduced in the mounting drawing, and the parts of the parts are re-determined. 3. The CAD drawing display method according to claim 2, wherein when the character / symbol information no longer interferes, the normal display is displayed.   The board design CAD includes a switching unit that switches between the normal display and the pop-up display when displaying the mounting diagram, and the display is switched according to the operation of the switching unit. The CAD drawing display method according to claim 2 or 3. The CAD is a circuit design CAD that reads mount data of a predetermined format output from the board design CAD as the character / symbol information,
2. The CAD drawing display method according to claim 1, wherein the circuit design CAD displays the CAD drawing as a circuit diagram.   The circuit design CAD re-determines the presence or absence of interference in a state where the character / symbol information is excluded from the enlargement / reduction when the display is enlarged / reduced in the circuit diagram. 6. The CAD drawing display method according to claim 5, wherein when the character / symbol information no longer interferes, the normal display is displayed.   The circuit design CAD includes a switching unit that switches between the normal display and the pop-up display when displaying the circuit diagram, and the display is switched according to the operation of the switching unit. The CAD drawing display method according to claim 5 or 6.

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