JPH0554103A - Wiring pattern designing method and cad system for designing wiring pattern - Google Patents

Abstract

(57) [Abstract] [Purpose] To facilitate the design of wiring patterns on printed circuit boards including non-lattice patterns. [Structure] Means 8 for determining a wiring start point and a wiring end point
And a means 18 for reading a designated point, and a preset generation rule for pulling out when the starting point is a wiring start point, and a preset generation rule for pulling out when the designated point matches the wiring end point Accordingly, a means 16 for generating a wiring pattern is provided between the start point and the wiring end point. This means 16
When the start point and the designated point are at positions that can form a rectangle with the X-direction side and the Y-direction side as diagonal points, the wiring pattern is generated from one point along the long side of the rectangle. A straight line segment and a line segment extending from the other point to the long side at a predetermined angle with respect to the side in the X direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CAD (Computer Aid) used for designing a wiring pattern on a printed circuit board, for example.
ed Design) system and its wiring pattern design method.

[0002]

2. Description of the Related Art Conventionally, when designing a wiring pattern of a printed circuit board using a CAD system, it is a general rule to generate a wiring pattern on a grid (hereinafter referred to as a basic grid) which is predetermined by the CAD system. (Below,
The wiring pattern generated on the basic lattice is called a lattice pattern. ). The spacing of this basic grid is typically 2.54 mm (0.1
Inch) is set, but there are also cases in which an auxiliary grid with some intervals (for example, 0.635 mm, 0.508 mm, 0.3175 mm) is set.

However, with the recent demand for miniaturization and high density of the printed circuit board, the component mounting density of the printed circuit board has been improved, and it has become necessary to generate a wiring pattern which does not follow the basic lattice (hereinafter, A non-lattice pattern is a wiring pattern that does not fit the basic lattice.) For such a non-lattice pattern, a method of creating a wiring pattern on this lattice by making the lattice spacing close, or a horizontal or vertical pattern so that the wiring pattern is arranged in either the X direction or the Y direction during extraction. A method has been used in which a simple wiring pattern is generated, and thereafter, a wiring pattern is generated on a basic lattice.

[0004]

With such a conventional non-lattice pattern generation method, the component mounting density of the printed circuit board can be improved to some extent.

However, the components currently used for printed circuit boards are diversified, and components having different terminal intervals are frequently mixed on one printed circuit board. The lattice pattern generation method has the following problems, and a method for designing a non-lattice pattern more freely and easily is desired.

The method of generating a non-lattice pattern with a close lattice spacing has a high retrieval efficiency because the optimal pattern is retrieved using the basic lattice, but all the terminals of the components used are present on the lattice. It is necessary, and the operator always has to generate a wiring pattern while being aware of the grid. Further, since the grid interval is frequently changed, a defect of the pattern is likely to occur.

Further, in the method of generating a horizontal or vertical pattern on the grid in at least one of the X direction and the Y direction at the time of drawing out, when the shape of the component terminal is other than the round shape (rectangle, oval, etc.) Since it suffices to pull out in the direction along the shape of the terminal, the pulling out can be made only in the horizontal or vertical direction. However, in the case of the round type, the drawing direction does not necessarily have to be the horizontal direction or the vertical direction, so that there is a problem that the operability deteriorates due to the limited drawing direction.

The present invention has been made in consideration of the above point, and an object of the present invention is to provide a wiring pattern designing method capable of easily designing a wiring pattern of a printed circuit board including a non-lattice pattern.

A further object of the present invention is to provide a CAD system in which the wiring pattern of a printed circuit board including a non-lattice pattern can be easily designed.

[0010]

In order to achieve the above object, the wiring pattern designing method of the present invention provides a step of determining a starting point of a wiring pattern on a screen and a point of drawing the wiring pattern from this starting point. And the point specified with respect to the starting point is at a position that can form a rectangle having horizontal (X direction) sides and vertical (Y direction) sides with these as diagonal points. Between the point and the designated point, a long-sided line segment that goes straight from one of the points along the long side of the rectangle, and a long-sided line segment from the other point at a preset angle with respect to the side in the X direction. And a step of generating a wiring pattern formed by connecting the hatched segments up to.

According to the present invention, in this wiring pattern designing method, a step of setting a wiring pattern generation rule which defines whether the line segment drawn from the starting point is a long side line segment or a diagonal line segment is added. Is characterized by.

Further, according to the present invention, in the above wiring pattern designing method, a step of determining whether or not the wiring pattern generated between the starting point and the designating point has a gap more than an allowable value with other elements. It is characterized by the addition.

In the wiring pattern designing CAD system of the present invention, the wiring section designating means for designating the wiring start point and the wiring end point of the wiring pattern on the drawing displayed on the screen, the wiring start point and the wiring. Between any two points between the end point, these points are at positions where they can be diagonal points to form a rectangle having horizontal (X direction) sides and vertical (Y direction) sides. At this time, a long side line segment that goes straight from one of the points along the long side of the rectangle and a diagonal line segment that reaches the long side line segment from the other point at a preset angle with respect to the side in the X direction And a wiring pattern generation means for generating a wiring pattern formed by combining the wiring patterns.

Further, according to the present invention, in this CAD system, wiring pattern check means for determining whether or not the wiring pattern generated by the wiring pattern generation means keeps a gap more than an allowable value with other elements is provided. It is characterized by

Further, according to the present invention, in the CAD system, the wiring pattern generating means reads the arbitrarily designated point on the screen, and the line segment drawn from the wiring start point is a long side line. A wiring pattern generation rule at the time of drawing out that determines whether the line segment is a line segment or a diagonal line segment, a wiring pattern generation time at drawing time that determines whether the line segment to be drawn to the wiring end point is a long side line segment or a diagonal line segment, and Wiring pattern generation rule setting means for respectively setting the angle of the diagonal line segment with respect to the side in the X direction, and a wiring start point or, if a wiring pattern has already been generated from this wiring start point, with the end point of this wiring pattern as the starting point, Between this starting point and the pointing point read by the pointing point reading means, when this starting point is the wiring starting point, the extraction set by the wiring pattern generation rule setting means Dummy wiring pattern is generated according to the wiring pattern generation rule at the time, and when the designated point matches the wiring end point, the dummy wiring pattern is generated according to the wiring pattern generation rule at the time of drawing set by the wiring pattern generation rule setting means. Dummy wiring pattern generation means, wiring pattern confirmation means for confirming the generated dummy wiring pattern as a wiring pattern, and when the designated point when the wiring pattern is fixed is not the wiring end point, the designated point is stored as a fixed point However, it is characterized by comprising a fixed point storage means for notifying the dummy wiring pattern generation means as a starting point of the subsequent wiring pattern.

Further, according to the present invention, in this CAD system, pattern check condition setting means for setting an allowable value of a gap between the respective elements on the drawing as a pattern check condition, and the set pattern check condition,
Wiring pattern check means including a pattern check means for determining whether or not the dummy wiring pattern generated by the dummy wiring pattern generation means keeps a gap of at least an allowable value with other elements is provided. To do.

[0017]

In the wiring pattern designing method and the wiring pattern designing CAD system of the present invention, only one point is designated with respect to a certain point, and a line segment in the X direction or the Y direction is formed at a predetermined angle as necessary. A wiring pattern composed of inclined line segments can be generated between two points. Therefore, even when the terminal to be the wiring start point is not on the grid, the non-lattice pattern can be easily formed between the wiring start point and the pointing point by placing the pointing point on the grid, preferably at the intersection point of the grid. Generate,
Thereafter, the wiring pattern can be designed along the grid. Similarly, even when the wiring end point is not on the grid,
It is possible to easily pull the non-lattice pattern to the wiring end point simply by placing the designated point at the wiring end point. At that time, by selecting the line segment drawn from the wiring start point and the line segment drawn to the wiring end point, a wiring pattern suitable for the position and shape of each terminal that becomes the wiring start point and the wiring end point is generated. be able to.

The CAD for wiring pattern design of the present invention
In the system, the wiring section designating unit determines the wiring start point and the wiring end point for connection, and the wiring pattern generation rule setting unit draws the wiring pattern from the wiring start point and the wiring pattern at the wiring end point of the wiring section. The generation rule of each wiring pattern when pulling in is set. Then, the position information of the point pointed by the pointing device such as a mouse is fetched by the pointing point reading means, and when the starting point is the wiring start point by the dummy wiring pattern generating means, that is, the fixed point is not stored in the fixed point storing means. When the drawing point is drawn, and when the designated point coincides with the wiring end point, it is inclined at a predetermined angle with the line segment in the X direction or the Y direction described above according to each wiring pattern generation rule when drawn. A dummy wiring pattern consisting of line segments is generated between the wiring start point or fixed point and the designated point. The shape of the dummy wiring pattern generated by the dummy wiring pattern generation means changes in accordance with the movement of the pointing point by the pointing device, but when it is decided by the wiring pattern decision means, the dummy wiring pattern is decided as the wiring pattern. The designated point at that time is stored as a fixed point by the fixed point storage means. The stored fixed point is notified to the dummy wiring pattern generation means as the starting point of the next dummy wiring pattern. In this way, when the wiring pattern is generated at the wiring start point and the wiring end point by sequentially generating and confirming the wiring pattern between the start point and the designated point, the wiring section designating means performs wiring next. The start point and the wiring end point are designated, and the above-described generation of the wiring pattern is repeated.

Therefore, the operator looks at the screen and
It is possible to freely and easily design a suitable wiring pattern according to the position and shape of each terminal to be connected and the arrangement of other patterns on the substrate without being restricted by the basic lattice.

Further, in the CAD system, a pattern check condition setting means for setting a pattern check condition consisting of an allowable value of a gap between each element on the substrate, and a pattern check condition set by the pattern check condition setting means are set. Based on the above, by providing pattern check means for checking the dummy wiring pattern whether or not the gap between the dummy wiring pattern generated by the dummy wiring pattern generation means and other elements is below an allowable value,
The operator can confirm whether or not it interferes with other obstacle elements immediately while generating the dummy wiring pattern while looking at the screen. Therefore, it is possible to efficiently design a wiring pattern having no wiring defects.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a CAD system for designing parts layout and wiring of a printed circuit board according to the present invention, which includes a display 1a, an input device 1b such as a keyboard and a mouse, and a storage device 2. It is composed of a component layout design means 3, a wiring pattern generation means 4, and a wiring pattern check means 5. Display 1a
Is a means for displaying information necessary for designing a wiring pattern such as a board layout diagram, and the input device 1b is means for inputting information necessary for designing based on screen information displayed on the display 1a. The storage device 2 stores data necessary for layout design of components on the board, design of wiring pattern, etc. Based on the data in the storage device 2, the optimal layout plan of the board is the component layout design means 3 Created by. The wiring pattern generation means 4 is arbitrarily instructed on the component layout created by the component layout design means 3 via the input device 1b, for example, the wiring start point, the wiring end point, and between them. A wiring pattern is generated between the wiring start point and the wiring end point on the basis of the coordinate information of the points. Then, the wiring pattern checking means 5 has a function of checking whether the wiring pattern generated by the wiring pattern generating means 4 has a sufficient distance from other elements on the substrate.

In designing a wiring pattern using such a CAD system, first, the display 1a
A component layout diagram of, for example, a printed wiring board as shown in FIG. 2 is displayed. A component layout diagram of such a wiring board is a library 2a for storing information on the shape of each component and the number of terminals stored in the storage device 2 on a component-by-component basis,
A netlist 2b that stores component names and connection signal information between mutual terminals, and a design rule file 2c that stores a laminated structure of a board, an allowable value of mutual gaps of mounted components and wiring patterns, information of lattice intervals, and the like. The data is automatically designed and displayed according to the component layout design means 3. Such automatic component placement design is performed by RACAL-REDAC, for example.
It has already been realized by VISULA software. Then, in the component layout diagram of this board, the terminals to be connected and the terminals are displayed by being connected by straight lines (dotted lines in the drawing) based on the connection signal information between the mutual terminals of the netlist 2b. In addition, the grid 6 that serves as a design reference is also displayed.

The wiring pattern is interactively designed based on the component layout of the board displayed on the display 1a. Below, the design process is shown in FIG. 2 and FIG.
And it demonstrates with reference to FIG. Here, FIG. 3 shows the wiring pattern generation means 4 and the wiring pattern check means 5 of FIG.
C for wiring pattern of the present invention showing the function of
FIG. 4 illustrates an example of an AD system, and FIG. 4 is a diagram illustrating a wiring pattern generation step.

First, as shown in FIG. 2, when the unconnected path 7 to be wired is selected from the unconnected paths in which the wiring pattern is not determined by a pointing device such as a mouse, the wiring section designating means 8 The end point of the unconnected path 7 that is close to the pick cursor 10 pointed by the pointing device in a straight line distance is recognized as the wiring start point 12 and the other end point is recognized as the wiring end point 14, and the dummy wiring pattern generation means 16 described later is notified. To do.

Wiring start point 1 by the wiring section designating means 8
When 2 and the wiring end point 14 are determined, the pointing point reading means 18 reads the coordinate information of the point 20a which the operator arbitrarily points with a pointing device such as a mouse, and uses the dummy wiring pattern generation means as the information of the pointing point 20a. 16 to provide.

The dummy wiring pattern generation means 16 first compares the input designating point 20a with the wiring end point 14 provided by the wiring section designating means 8 and when no coincidence is detected, the wiring starting point 12 and the designating point 20a. In between, a dummy wiring pattern is generated in accordance with the wiring pattern generation rule at the time of drawing set in advance by the wiring pattern generation rule setting means 24 described below.

As shown in FIG. 4, when the point 20a not in the X direction or the Y direction is specified with respect to the wiring start point 12, the wiring pattern generated at the time of drawing is a wiring pattern 26. Or the pattern of reference numeral 28 is designated. The wiring pattern of reference numeral 26 assumes a rectangle 30 having a side in the X direction and a side in the Y direction with the wiring start point 12 and the designated point 20a as diagonal points, and the wiring start point 1
A line segment 26a is generated from 2 on the long side, and a line segment 26b is formed from the line segment 26a to the designated point 20a with respect to the side in the X direction at a predetermined angle, for example, an inclination of 45 °. Code 2
In the wiring pattern No. 8, a line segment 28a is generated from the wiring start point 12 at an inclination of, for example, 45 °, and a line segment 28b is generated along the long side to the designated point 20a at a point where the line segment 28a collides with the long side. Become. If the former wiring pattern 26 is defined as the long-side mode and the latter wiring pattern 28 is defined as the short-side mode, the wiring pattern generation rule at the time of extraction is as follows in the wiring pattern generation rule setting window 31 as shown in FIG. By selecting either the long side or the short side in the pull-out field of the menu 33 of the wiring item 32, the pattern generation rule setting means 24 is set. The inclinations of the line segments 26b and 28a are determined by writing the angles in the menu of the grid item 34 in the window 31. The angle of this line segment can be set arbitrarily within the range of 0 ° to 90 °. Further, such screen data of the wiring pattern generation rule setting window 31 is created by the wiring pattern generation rule setting means 24 based on the data in the storage device 2, and is called up on the display 1a according to the operator's request and designed. It is displayed as a wiring pattern generation rule setting window 31 separately from the display screen. The mode of the wiring pattern at the time of drawing out can be selected depending on the shape of the component terminal, which is the wiring starting point 12. In the example of FIG. 4, since the terminal at the wiring start point has an oval shape, the long side mode is selected.

In this manner, the dummy wiring pattern generation means 16 follows the code between the wiring start point 12 and the designated point 20a according to the wiring pattern generation rule at the time of drawing set in the wiring pattern generation rule setting means 24. 26 dummy wiring patterns are generated. At this time, the designated point 20a
Is set on the grid 6, more preferably at the intersection, even if the wiring start point 12 is not on the grid 6, a vertical line segment can be easily drawn from the wiring start point 12 and drawn on the grid 6, and The wiring pattern can be generated along the grid 6.

The rubber band display control means 42 displays the dummy wiring pattern generated by the dummy wiring pattern generation means 16 on the display 1a. At this time, if the dummy wiring pattern has already been displayed, the existing dummy wiring pattern is first erased and a new dummy wiring pattern is displayed. Therefore, by the rubber band display control means 42, the dummy wiring pattern generated by the dummy wiring pattern generation means 16 in real time according to the movement of the designated point 20a is displayed on the display 1a like a rubber band. Therefore, the operator moves the pointing device while moving the pointing point 20.
It is possible to find a suitable pattern by taking a on the lattice 6, for example, at the intersection of the lattice 6.

At the same time, the pattern check means 44 determines whether the dummy wiring pattern generated by the dummy wiring pattern generation means 16 maintains a sufficient gap with other pattern elements based on the preset pattern check condition. , The operator is notified, for example, by a method such as color display, buzzer, and message.

The pattern check condition is preset by the pattern check condition setting means 46. For example, as shown in FIG. 6, a pattern check condition is set by numerically designating an allowable distance between a wiring pattern and each element that is an obstacle to this pattern through a pattern check condition setting window 61. In the example of FIG.
Between PAD-PAD, between PAD-VIA, VIA-VIA
, PAD-LINE, VIA-LINE, LIN
The respective allowable clearance values between E-LINE are called from the design rule file 2c and set. The screen data of the pattern check condition setting window 61 is created by the pattern check condition setting means 46 based on the data of the storage device 2, and is displayed as the pattern check condition setting window 61 in place of the wiring pattern generation rule setting window 31. 1a is displayed.

The pattern checking means 44 firstly, based on the gap allowance between the respective elements set in the pattern check condition setting means 46, first, as shown in FIG. Figure 7 with 72
3 is assumed, the substrate is divided into meshes of a predetermined size,
For each mesh, the distances between the figures 73 in the mesh are calculated and the presence or absence of the intersection is determined to determine whether or not the spacing is sufficiently maintained.

The wiring pattern confirmation means 74 is means for confirming the dummy wiring pattern displayed on the screen via the rubber band display control means 42, and when the confirmation signal is inputted by the operator, the pattern check means is provided. The dummy wiring pattern passing through 44 is confirmed as a wiring pattern and displayed on the display 1a via the wiring pattern display means 76.

The fixed point storing means 78 stores the fixed designated point 2
The coordinates of 0a are saved, and the dummy wiring pattern generation means 16 is notified as the starting point of the wiring pattern to be generated next.

When the wiring pattern is fixed between the wiring start point 12 and the designated point 20a as described above, the pointing device arbitrarily designates the fixed point 20a which is the previous designated point as the starting point. Between the point 20b and the point 20b, a dummy wiring pattern is generated in accordance with the wiring pattern generation rule at the time of drawing preset in the wiring pattern generation rule setting means 24. Usually, it is easier to design a wiring pattern along the grid 6, so that the designated point 20b is obtained on the same grid line segment as the fixed point 20a, and a horizontal wiring is provided between the fixed point 20a and the designated point 20b. The pattern 80 is generated.

When the horizontal wiring pattern 80 is fixed, the designated point 20b is rewritten as a new fixed point in the fixed point storing means 22, and the fixed point 20b and the next designated point 20 are rewritten.
A wiring pattern is generated between the wiring pattern and c.

Here, when the wiring end point 14 is designated by the pointing device, the dermy wiring pattern generation means 16 detects that the designated point 20c coincides with the wiring end point 14, and the wiring pattern generation rule setting means 24.
A dummy wiring pattern of the long side mode 82 or the short side mode 84 is generated according to the wiring pattern generation rule at the time of lead-in set in advance. In this case, the long side mode and the short side mode are determined with reference to the designated point which is the wiring end point. The wiring pattern generation rule at the time of drawing in is set in the wiring pattern generation rule setting window 31 like the wiring pattern generation rule at the time of drawing out. Wiring end point 1
If 4 is an oblong terminal, the long side mode for drawing the vertical line segment is selected.

As described above, the dummy wiring pattern generation means 16 recognizes the wiring start point 12 as the start point when the fixed point is not stored in the fixed point storage means 78, and is fixed in the fixed point storage means 78. When the point is stored, this fixed point is recognized as the starting point and a dummy wiring pattern is generated between the starting point and the designated point.

Although it has been described that the wiring pattern generated between the definite point 20a and the designated point 20b which is not the wiring end point complies with the generation rule at the time of drawing, the generation pattern at the time of drawing is not limited to this. Good.

Through the above wiring pattern generation steps,
Between the wiring start point 12 and the wiring end point 14, for example, as shown in FIG.
A wiring pattern indicated by a thick line is generated. When a wiring pattern between one wiring start point and one wiring end point is determined, the next wiring section is selected by the wiring section designating means 8, and thereafter, the wiring pattern is designed in the same manner, as shown in FIG. Such a wiring pattern design drawing can be obtained. ..

As described above, according to the present invention, the wiring pattern can be designed in accordance with the terminal shape of the component used on the printed circuit board, and the wiring pattern from the component terminal not on the grid can be designed. It is possible for an operator to design a non-lattice pattern without being aware of the basic lattice. Furthermore, by performing the pattern check at the stage of generating the dummy wiring pattern, it is possible to efficiently design a suitable pattern having no wiring defect.

Although the above embodiment has the function of performing the pattern check after the dummy wiring patterns are generated, the pattern check may be performed after the design of all the wiring patterns is completed.

In the above embodiment, the wiring pattern generation rule is set in advance to generate the dummy wiring pattern for either the long side mode or the short side mode and display it on the display. After displaying both the short-side mode dummy wiring patterns on the display, the operator can select either one of the patterns.

[0044]

As described above, according to the present invention,
The wiring pattern including the non-lattice pattern can be designed more freely and efficiently and easily, and the demand for miniaturization and high density of the printed circuit board can be sufficiently satisfied.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration example of a CAD system for component placement and wiring design according to the present invention.

FIG. 2 is a diagram illustrating a component layout diagram of a board and a method of specifying a wiring section.

FIG. 3 is a block diagram showing an embodiment of a CAD system for wiring pattern design of the present invention.

FIG. 4 is a diagram illustrating a method of generating a wiring pattern divided into steps.

FIG. 5 is a diagram showing a wiring pattern generation rule setting window.

FIG. 6 is a diagram showing a pattern check condition setting window.

FIG. 7 is a diagram illustrating a pattern check method.

FIG. 8 is a diagram illustrating a wiring pattern on a board designed according to the present invention.

[Explanation of symbols]

 2 ... Memory device 3 ... Component layout design means 4 ... Wiring pattern generation means 5 ... Wiring pattern check means 6 ... Lattice 7 ... Unconnected route 8 ... Wiring section designation means 10 ... Pick cursor 12 ... Wiring start point 14 ... Wiring end point 16 ... Dummy wiring pattern generating means 18 ... Pointing point reading means 20 ... Pointing point 24 ... Wiring pattern generation Rule setting means 26 ......... long-side mode wiring pattern at the time of drawing 28 ......... short-side mode wiring pattern at the time of drawing 31 ......... wiring pattern generation rule setting window 42 ......... rubber band display control means 44 ...... Pattern check means 46 ...... Pattern check condition setting means 61 ...... Pattern check condition setting window 74 ............ Wiring pattern confirming means 7 6 ... Wiring pattern display means 78 ... Fixed point storage means 82 ... Long-side mode wiring pattern at pull-in 84 ... Short-side mode wiring pattern at pull-in

Claims (8)

[Claims] 1. A step of deciding a starting point of a wiring pattern on a screen, a step of instructing a point of drawing in the wiring pattern from the starting point, and a point instructed with respect to the starting point is a horizontal point with these points as diagonal points. When a rectangle having two sides (in the X direction) and a vertical side (in the Y direction) can be formed, from one of the points between the start point and the designated point to the long side of the rectangle. And a step of generating a wiring pattern in which a long side line segment that goes straight along and a diagonal line segment from the other point to the long side line segment at a preset angle with respect to the side in the X direction are combined. A method for designing a wiring pattern, which comprises: 2. The method according to claim 1, further comprising the step of setting a wiring pattern generation rule that defines whether the line segment drawn from the start point is the long side line segment or the diagonal line segment. Wiring pattern designing method characterized by. 3. The method according to claim 1 or 2, wherein
The wiring pattern designing method further comprising the step of determining whether or not the wiring pattern generated between the starting point and the designated point has a gap of at least an allowable value with other elements. 4. The wiring pattern designing method according to claim 1, wherein at least one of the starting point and the designating point is on a grid displayed on a screen. 5. A wiring section designating means for designating a wiring start point and a wiring end point of a wiring pattern on a drawing displayed on a screen, and any two points between the wiring start point and the wiring end point. Between,
When these points are diagonal points and are in a position capable of forming a rectangle having horizontal (X direction) sides and vertical (Y direction) sides, the long side of the rectangle from either one of the points A wiring pattern for generating a wiring pattern in which a long side line segment that goes straight along a line and a diagonal line segment from the other point to the long side line segment at a preset angle with respect to the side in the X direction are combined. A CAD system for wiring pattern design, comprising: a generation unit. 6. The CAD system according to claim 5, further comprising wiring pattern check means for determining whether or not the wiring pattern generated by the wiring pattern generation means maintains a gap of an allowable value or more with other elements. A CAD system for wiring pattern design, further comprising: 7. The CAD system according to claim 5, wherein the wiring pattern generating means reads the arbitrarily designated point on the screen, and the line segment drawn from the wiring start point is long. Wiring pattern generation rule for drawing out that determines whether it is a side line segment or diagonal line segment, Wiring pattern generation rule for drawing in to determine whether the line segment to be drawn to the wiring end point is a long side line segment or a diagonal line segment , And wiring pattern generation rule setting means for respectively setting the angle of the diagonal line segment with respect to the side in the X direction, and the wiring start point or the end point of the wiring pattern if the wiring pattern has already been generated from this wiring start point. As a starting point, between the starting point and the pointing point read by the pointing point reading means, when the starting point is the wiring starting point, the wiring pattern generation rule setting means A dummy wiring pattern is generated according to the wiring pattern generation rule at the time of extraction set by the above, and when the designated point coincides with the wiring end point, the wiring pattern generation rule at the time of retraction set by the wiring pattern generation rule setting means. Dummy wiring pattern generation means for generating a dummy wiring pattern according to the above, wiring pattern confirmation means for confirming the generated dummy wiring pattern as a wiring pattern, and when the designated point when the wiring pattern is determined is not the wiring end point, A CAD system for wiring pattern design, comprising: fixed point storage means for storing coordinates of a designated point as a fixed point and notifying the dummy wiring pattern generation means as a starting point of a subsequent wiring pattern. 8. The CA for wiring pattern design according to claim 6.
In the D system, the wiring pattern generation means reads the arbitrarily designated point on the screen, and the line segment drawn from the wiring start point is either a long side line segment or a diagonal line segment. The wiring pattern generation rule at the time of drawing to determine whether the line segment drawn to the wiring end point is the long side line segment or the diagonal line segment, and the diagonal line segment for the side in the X direction. Wiring pattern generation rule setting means for setting respective angles, and when the wiring start point or a wiring pattern has already been generated from this wiring start point, the end point of the wiring pattern is set as the starting point, and this starting point and the designated point are read. When the starting point is the wiring start point between the designated point read by the means, the wiring pattern at the time of drawing set by the wiring pattern generation rule setting means. A dummy for generating a dummy wiring pattern according to a wiring generation rule, and when the designated point coincides with the wiring end point, a dummy for generating a dummy wiring pattern according to the wiring pattern generation rule at the time of drawing set by the wiring pattern generation rule setting means. Wiring pattern generation means, wiring pattern confirmation means for confirming the generated dummy wiring pattern as a wiring pattern, and when the designated point when the wiring pattern is fixed is not the wiring end point, the designated point is stored as a fixed point. And a fixed point storing means for notifying the dummy wiring pattern generating means as a starting point of the subsequent wiring pattern, and the wiring pattern checking means sets an allowable value of a gap between elements on the drawing as a pattern checking condition. Pattern check condition setting means to perform and the set pattern check condition And a pattern check means for determining whether or not the dummy wiring pattern generated by the dummy wiring pattern generating means maintains a gap equal to or larger than an allowable value with other elements based on CAD system for pattern design.