JP3122040B2 - Spiral via design equipment for printed circuit board design equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a spiral via design apparatus in a printed circuit board design apparatus, and more particularly, to a computer-assisted CAD system, which is a printed circuit board design apparatus.
The present invention relates to a spiral via design device in a printed circuit board design device that can be used when designing a via.

[0002]

2. Description of the Related Art Conventionally, printed circuit board design has been performed using a printed circuit board design apparatus, which is a CAD system supported by a computer.

[0003] In general, in a printed circuit board composed of a multi-layer board, vias are formed in order to make connections between layers. Such vias include a through via formed through a printed board made of a multilayer board and an interlayer via provided between predetermined layers of the printed board made of a multilayer board (see FIG. 1).

[0004] In recent years, there has been an increasing demand for higher densities and multilayers for printed circuit boards.
An I-design method has been introduced, and as such a method, for example, the SLC method is known. In the SLC method, a normal printed circuit board is first prepared, and a multi-layer, high-density substrate (laminated substrate) is formed on the normal printed circuit board by using an LSI lamination technique (see FIG. 2).

[0005] However, in the case of a laminated substrate formed by the SLC method or the like, if the usual through vias and interlayer vias shown in FIG. , And spiral vias are formed to connect between the layers.

[0006] Here, the spiral via corresponds to FIG.
As shown in (a) and (b), the openings are formed so as to be spirally displaced so as to slightly overlap each other between adjacent layers. By using such a spiral via, The connection between the layers of the laminated substrate can be made at low cost.

However, at present, there is no design device corresponding to the spiral via, and therefore, the design of the spiral via is performed by using a conventional through-via or interlayer via design device which has been conventionally used. I was

However, when a spiral via is designed using a conventional through-via or interlayer via design apparatus which is conventionally used, when a spiral via is input, a spiral via is provided for each layer of the laminated substrate. There is a problem that the design work is extremely complicated and requires a great deal of work time, such as the need to input vias and the need to move spiral vias by editing one layer at a time. there were.

The present invention has been made in view of the above-mentioned various problems of the prior art, and has as its object to simplify the design work of a spiral via and greatly reduce the work time. An object of the present invention is to provide a spiral via design device in a printed circuit board design device that can be shortened.

[0010]

In order to achieve the above object, a spiral via designing apparatus in a printed circuit board designing apparatus according to the present invention includes a computer aided CAD system for designing a printed circuit board layout diagram. In the board design equipment, figure information, logic information, and spiral
A storage means for storing a table having via shapes and arrangement positions, an arrangement position designating means for designating an arrangement position to be a reference of a spiral via, and graphic information and logic information stored in the storage means are referred to. Displaying the printed circuit board layout diagram, referring to the table stored in the storage means, and according to the reference arrangement position designated by the arrangement position designating means, for each layer of the printed circuit board of the printed circuit board layout diagram. And display means for displaying spiral vias.

The spiral via designing apparatus in the printed circuit board designing apparatus according to the present invention is a computer-assisted printed circuit board designing apparatus which is a CAD system for designing a printed circuit board layout diagram. A storage means for storing a table having the shape and arrangement position of the spiral via for each layer of the printed circuit board, and referring to the graphic information and the logical information stored in the storage means to display a printed circuit board layout diagram and A display means for displaying a spiral via for each layer of the printed circuit board of the printed circuit board layout diagram with reference to the table stored in the storage means, and a spiral for indicating the spiral via displayed on the display means・ Via instructing means, and the above stored in the storing means Referring to Buru, spiral editing the spiral via designated by said instruction means
This has a via editing means.

The spiral via designing apparatus in the printed circuit board designing apparatus according to the present invention is a computer-supported CAD system for designing a printed circuit board layout diagram. Storage means for storing a table having via shapes and arrangement positions; table display means for displaying the table by referring to the table stored in the storage means; and the table displayed on the table display means And a table editing means for editing the data.

The spiral via designing apparatus in the printed circuit board designing apparatus according to the present invention is a computer-aided printed circuit board designing apparatus which is a CAD system for designing a printed circuit board layout diagram. Logical information including information, the shape of the spiral via for each layer of the printed circuit board,
Storage means for storing a table having an arrangement position and an allowable range; and reference to the graphic information and logic information stored in the storage means, a printed circuit board layout diagram is displayed, and the table stored in the storage means is displayed. Display means for displaying spiral vias for each layer of the printed circuit board of the printed circuit board layout diagram, and when new design data or manufacturing data is inserted into the printed circuit board layout diagram displayed on the display means. The design rule determining means for determining whether the new design data or manufacturing data and the spiral via comply with the design rule indicated in the design rule information, and the design rule determining means When it is determined that the design rules are not followed, Referring to the table stored in the stage to follow the design rules, in which so as to have a deformation means for deforming the spiral vias within the allowable range of the table.

Further, according to the present invention, there is provided a spiral via design apparatus in a printed circuit board design apparatus, which comprises: a computer-assisted CAD system for designing a printed circuit board layout diagram; Logical information including information, the shape of the spiral via for each layer of the printed circuit board,
Storage means for storing a table having an arrangement position and an allowable range; and reference to the graphic information and logic information stored in the storage means, a printed circuit board layout diagram is displayed, and the table stored in the storage means is displayed. Display means for displaying spiral vias for each layer of the printed circuit board of the printed circuit board layout diagram, and new wiring when performing new wiring on the printed circuit board layout diagram displayed on the display means. And a design that determines whether the spiral via complies with the design rule indicated in the design rule information.
When it is determined that the design rule is not in accordance with the design rule by the rule determining means and the design rule determining means, the table in the table is referred to in accordance with the design rule by referring to the table stored in the storage means. And a deforming means for deforming the spiral via within an allowable range.

Further, according to the present invention, there is provided a spiral via design apparatus in a printed circuit board designing apparatus, which is a computer aided CAD system for designing a printed circuit board layout diagram, comprising: graphic information and design rules. Logical information including information, the shape of the spiral via for each layer of the printed circuit board,
Storage means for storing a table having an arrangement position and an allowable range; and reference to the graphic information and logic information stored in the storage means, a printed circuit board layout diagram is displayed, and the table stored in the storage means is displayed. A display means for displaying spiral vias for each layer of the printed circuit board of the printed circuit board layout diagram, and a new component when arranging a new component on the printed circuit board layout diagram displayed on the display means. Design rule judging means for judging whether or not the arrangement of various parts and the spiral via comply with the design rule indicated in the design rule information, and the design rule judging means does not comply with the design rule When it is determined that the above table is referred to the table stored in the storage means, To follow the design rules, in which so as to have a deformation means for deforming the spiral vias within the allowable range of the table.

The spiral via designing apparatus in the printed circuit board designing apparatus according to the present invention is a computer-assisted printed circuit board designing apparatus which is a CAD system for designing a printed circuit board layout diagram. Logical information including information, the shape of the spiral via for each layer of the printed circuit board,
Storage means for storing a table having an arrangement position and a permissible range; arrangement position instructing means for instructing an arrangement position serving as a reference of a spiral via; and reference to graphic information and logical information stored in the storage means. While displaying the printed circuit board layout diagram, referring to the table stored in the storage means, and according to the reference arrangement position designated by the arrangement position designating means, for each layer of the printed circuit board of the printed circuit board layout diagram Display means for displaying a spiral via, and a spiral layout for each layer of the printed circuit board in the printed circuit board layout diagram according to a reference layout position designated by the layout position designating means.
When displaying a via, when the design rule judging means for judging whether or not the design rule indicated in the design rule information is complied with, and when the design rule judging means judges that the design rule is not complied with. And a deforming means for deforming the spiral via within the allowable range of the table by referring to the table stored in the storage means so as to comply with the design rule.

The spiral via designing apparatus in the printed circuit board designing apparatus according to the present invention is a computer-assisted printed circuit board designing apparatus which is a CAD system for designing a printed circuit board layout diagram. Logical information including information, the shape of the spiral via for each layer of the printed circuit board,
Storage means for storing a table having an arrangement position and a permissible range; arrangement position instructing means for instructing an arrangement position serving as a reference of a spiral via; and reference to graphic information and logical information stored in the storage means. While displaying the printed circuit board layout diagram, referring to the table stored in the storage means, and according to the reference arrangement position designated by the arrangement position designating means, for each layer of the printed circuit board of the printed circuit board layout diagram A display means for displaying a spiral via, a table display means for displaying the table with reference to the table stored in the storage means, and a reference arrangement position designated by the arrangement position designation means. When displaying spiral vias for each layer of the printed circuit board in the printed circuit board layout diagram, When new wiring is performed on the printed circuit board layout diagram displayed in the row and when new components are arranged on the printed circuit board layout diagram displayed on the display means, the design rule information is displayed. A design rule judging means for judging whether or not the design rule is obeyed, and referring to the table stored in the storage means when the design rule judging means judges that the design rule is not obeyed, According to the above design rules,
Deforming means for deforming the spiral via within the permissible range of the table, spiral via instructing means for instructing the spiral via displayed on the display means,
Spiral via editing means for referring to the table stored in the storage means and editing the spiral via indicated by the indicating means, and table editing means for editing the table displayed on the table display means It has the following.

The spiral via designing apparatus in the printed circuit board designing apparatus according to the present invention is an object to arrange spiral vias in a printed circuit board designing apparatus which is a CAD system assisted by a computer for designing a printed circuit board layout diagram. First designating means for designating the range of the layer of the printed circuit board, second designating means for designating the shape and arrangement position of the spiral via of the reference layer of the printed circuit board, and Third designating means for designating the shape of the spiral via in a layer other than the reference layer, and arranging the spiral via so as to cause a predetermined displacement between the spiral via in each layer of the printed circuit board And an arrangement position setting means for setting a position.

[0019]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a printed circuit board designing apparatus according to the present invention.
An example of an embodiment of a via design device will be described in detail.

FIG. 4 is a functional block diagram of a main part of a printed circuit board designing apparatus provided with a spiral via designing apparatus in the printed circuit board designing apparatus according to the present invention. The printed circuit board designing apparatus includes an input unit 10 including a mouse and a keyboard, and a storage unit 12 storing graphic information, logical information, and a spiral via table.
The control unit 1 reads out the storage unit 12 in accordance with an instruction from the input unit 10 and executes a process shown in a flowchart described later
4 and a display unit 16 for displaying a printed circuit board layout diagram under the control of the control unit 14.

The control unit 14 includes a CPU, a ROM storing a program to be executed by the CPU,
It has a RAM as an area.

Here, the graphic information stored in the storage unit 12 includes a graphic identification number (graphic ID), a graphic type, and arrangement coordinates, and the logical information includes net information, component information, and design rule information. It is configured to have.

The spiral via table stores a table number, a layer number, a shape, an arrangement coordinate, and an allowable range as one.
A table stored as a set of data, for example,
It has a structure as shown in FIG. The above-mentioned allowable range indicates the ratio of the overlapping portions of the spiral vias formed in each layer when viewed from the top as shown in FIG. When the vias do not overlap at all, the value is 0%, and when one of the spiral vias formed in each layer is included in the other, the value is 100%.

In the spiral via table shown in FIG. 5, the arrangement coordinates are represented by x using an orthogonal coordinate system.
Although represented by coordinates and y coordinates (see FIG. 6A), they may be represented by a radius r and an angle θ using a polar coordinate system (see FIG. 6B).

The processing executed by the control section 14 of the printed circuit board designing apparatus in the above configuration will be described with reference to the flowcharts shown in FIGS.

FIG. 7 is a flowchart showing a main routine. In this printed circuit board designing apparatus, when initialization such as initialization of the RAM of the control unit 12 is performed after the power is turned on (step S702), the input unit 10 and waits for an input by the input unit 10. According to the input from the input unit 10, the placement processing (step S 704) and the wiring processing (step S 7
06), spiral via input processing (step S70)
8) Or spiral via editing process (step S7)
10) is performed.

Here, in the arrangement processing (step S704) and the wiring processing (step S706), in order to create a printed circuit board layout diagram, a graphic representing a printed circuit board, various components, various wirings, etc.
This is a process for editing a graphic representing a printed circuit board, various components, various wirings, or the like, which is a conventionally known technique, and a detailed description thereof will be omitted.

FIG. 8 is a flow chart of the spiral via input processing. First, the position where the spiral via is arranged on the laminated substrate formed by the SLC method or the like is designated using the input unit 10. (Step S8
02).

Then, a desired spiral via table is designated by designating the table number of the spiral via table stored in the storage unit 14 (step S804).

Further, the spiral rule selected in step S804 is referred to with reference to the design rule information.
The spiral via formed by the via table is the design
It is determined whether it is instructed to check whether or not the rule is satisfied (step S806). The instruction as to whether or not to perform such a check is provided by the input unit 1.
Perform using 0.

If it is determined in step S806 that the user has not been instructed to perform the check, step S806 is performed on the printed circuit board displayed on the display unit 16.
The spiral via formed by the spiral via table selected in 804 is arranged and displayed (step S808).

The spiral via arranged and displayed in step S808 is added to the graphic information to update the graphic information (step S810), and the process returns to the main routine.

On the other hand, if it is determined in step S806 that an instruction to perform a check has been issued,
After executing the automatic conversion process (step S812), the process returns to the main routine.

FIG. 9 shows a flowchart of the automatic conversion process. First, a minimum rectangular area including a spiral via formed by the spiral via table selected in step S804 is detected (step S804). S902).

Next, it is determined whether or not the minimum rectangle detected in step S902 can be arranged on the printed board in conformity with the design rules (step S90).
4).

If it is determined in step S904 that the spiral via table cannot be arranged, the spiral via table selected in step S804 is formed within the allowable range indicated by the spiral via table selected in step S804. Adjusts the ratio of overlapping spiral vias to perform deformation and determines whether the smallest rectangular area containing the deformed spiral vias can be placed on the printed circuit board in conformance with the design rules (Step S906) Step S906
In step S908, if it is determined that the minimum rectangular area including the deformed spiral via can be arranged on the printed circuit board in conformity with the design rule, actual deformation processing is performed (step S908), and the display is performed. The spiral via formed by the spiral via table deformed in step S908 is arranged and displayed on the printed circuit board displayed in the unit 16 (step S9).
10). If the spiral via table used by the deformed spiral via at this time is not used by another spiral via, the content of the spiral via table is changed, and the other spiral via table is changed. If a via is used, add the deformed spiral via data to the spiral via table.

On the other hand, if it is determined in step S904 that the arrangement is possible, the process proceeds to step S910.
Then, the spiral via formed by the undeformed spiral via table is arranged and displayed on the printed circuit board displayed on the display unit 16 (step S910).

The spiral via arranged and displayed in step S910 is added to the graphic information to update the graphic information (step S912), and the process returns to the spiral via input processing.

FIG. 10 shows a flowchart of the spiral via editing process, in which the range of the layer of the printed circuit board on which the spiral via is to be edited is input to the input unit 10.
(Step S1002), and edit processing is performed (step S1004).

Here, the editing processing in step S1004 includes movement, addition, and deletion of a spiral via. Such an editing process may be performed by using a technique similar to a conventionally known figure editing method in a printed circuit board design apparatus, and thus a detailed description thereof will be omitted.

Next, referring to the design rule information,
It is determined whether the spiral via edited in step S1004 is instructed to check whether it conforms to the design rule indicated by the design rule information (step S1006).
The instruction as to whether or not to perform such a check is made using the input unit 10.

If it is determined in step S1006 that the user has not been instructed to perform the check, the spiral via edited in step S1004 is arranged on the printed circuit board displayed on the display unit 16. It is displayed (step S1008).

The graphic information is updated by adding the spiral via arranged and displayed in step S1008 to the graphic information (step S1010), and the process returns to the main routine.

On the other hand, if it is determined in step S1006 that an instruction to perform a check has been issued, an automatic conversion process is performed (step S101).
2) Return to the main routine.

Note that the automatic conversion processing in step S1012 is the same as the automatic conversion processing shown in FIG. 9, and a detailed description thereof will be omitted.

Next, a process for creating a spiral via table will be described with reference to the flowchart shown in FIG.

That is, to create a spiral via table, first, a range of a layer on which a spiral via on a printed circuit board is to be arranged is specified (step S110).
2). Next, the shape and arrangement coordinates of the spiral via of the layer serving as the reference of the printed circuit board are input using the input unit 10 (step S1104). Here, the arrangement coordinates may use a rectangular coordinate system (FIG. 6A) or a polar coordinate system (FIG. 6A).
(B)) may be used.

Further, the shape of the spiral via to be arranged in each layer of the printed board targeted in step S1102 is designated by the graphic ID using the input unit 10 (step S1106).

Then, an arrangement position is calculated so that the spiral vias have a predetermined displacement between the respective layers of the printed circuit board (step S110).
8). In addition, the above-mentioned predetermined gap can be designated using the input unit 10.

Then, a spiral via table is created according to the spiral via specified in steps S1102 to S1108 (step S1110).

In step S1110, a spiral via table is created and the display unit 1
Step S11 on the printed circuit board displayed in Step 6.
02 to the step S1108 may be arranged and displayed.

In the above embodiment, the spiral via table is displayed on the display section 16 so that the table number, layer number, shape, arrangement coordinates and allowable range shown in the spiral via table are displayed. The spiral via table may be edited by using the input unit 10 for correction.

Further, when a new figure is added or wiring is performed on the printed circuit board layout diagram, step S806 is performed.
→ As shown in step S812, the design rule may be checked, and the spiral via may be deformed as necessary by the automatic conversion process (see FIG. 9).

In the flowchart of the above-described embodiment, the case where the arrangement / wiring is performed has been described. In this part, the same processing is performed when adding / editing design data or manufacturing data. Of course, the spiral via can be deformed.

[0055]

Since the present invention is constructed as described above, it has an excellent effect that the design work of the spiral via can be simplified and the work time can be greatly reduced. Things.

[Brief description of the drawings]

FIG. 1 is a schematic enlarged sectional explanatory view of a printed circuit board showing vias (through vias and interlayer vias) formed on a conventional printed circuit board.

FIG. 2 is a schematic enlarged cross-sectional explanatory view showing a laminated substrate formed by an SLC method.

FIGS. 3A and 3B are explanatory diagrams of a spiral via, and FIG.
It is a schematic enlarged sectional explanatory view of a laminated substrate by the LC method,
(B) is an arrow A view of (a). In (b), the spiral vias of each layer are indicated by hatching in order to clearly show the positional relationship of the spiral vias of each layer.

FIG. 4 is a functional block configuration diagram of a main part of a printed circuit board designing apparatus including a spiral via designing apparatus in the printed circuit board designing apparatus according to the present invention.

FIG. 5 is an explanatory diagram schematically showing a spiral via table.

FIG. 6 is an explanatory diagram showing a coordinate system of arrangement coordinates, and FIG.
Is an explanatory diagram of a rectangular coordinate system, and (b) is an explanatory diagram of a polar coordinate system.

FIG. 7 is a flowchart showing a main routine.

FIG. 8 is a flowchart showing a spiral via input process.

FIG. 9 is a flowchart illustrating an automatic conversion process.

FIG. 10 is a flowchart showing a spiral / via editing process.

FIG. 11 is a flowchart illustrating a process of creating a spiral via table.

[Explanation of symbols]

 Reference Signs List 10 input unit 12 storage unit 14 control unit 16 display unit

Claims (9)

(57) [Claims] A printed circuit board design apparatus, which is a computer-aided CAD system for designing a printed circuit board layout diagram, comprising: graphic information, logical information, and the shape and arrangement position of a spiral via for each layer of the printed circuit board. Storage means for storing a table having a table, a layout position indicating means for specifying a reference layout position of a spiral via, and a graphic layout and a logic information stored in the storage means. Display,
Display means for referring to the table stored in the storage means, and displaying spiral vias for each layer of the printed circuit board in the printed circuit board layout diagram according to a reference arrangement position designated by the arrangement position designating means; A spiral via designing apparatus in a printed circuit board designing apparatus, characterized by having: 2. A printed circuit board design apparatus as a CAD system assisted by a computer for designing a printed circuit board layout diagram, comprising: graphic information, logical information, and the shape and arrangement position of a spiral via for each layer of the printed circuit board. A storage unit for storing a table having a table, and referring to the graphic information and the logical information stored in the storage unit, and displaying a printed circuit board layout diagram,
A display unit for displaying a spiral via for each layer of the printed circuit board of the printed circuit board layout diagram with reference to the table stored in the storage unit; and a spiral display for indicating the spiral via displayed on the display unit. A spiral in a printed circuit board design device, comprising: via instruction means; and spiral / via editing means for referring to the table stored in the storage means and editing the spiral via specified by the instruction means. -Via design equipment. 3. A printed circuit board design apparatus, which is a computer-aided CAD system for designing a printed circuit board layout diagram. A storage means for storing a table having a shape and an arrangement position of a spiral via for each layer of the printed circuit board. A table display unit for displaying the table by referring to the table stored in the storage unit; and a table editing unit for editing the table displayed on the table display unit. Spiral via design equipment in printed circuit board design equipment. 4. A printed circuit board design apparatus, which is a CAD system assisted by a computer for designing a printed circuit board layout diagram, comprising: graphic information; logical information including design rule information;
Storage means for storing a table having a shape, an arrangement position and an allowable range of a spiral via for each layer of the printed circuit board; and a printed circuit board layout diagram is displayed by referring to graphic information and logical information stored in the storage means. Along with
Display means for displaying spiral vias for each layer of the printed circuit board in the printed circuit board layout diagram with reference to the table stored in the storage means; and a new printed circuit board layout diagram displayed on the display means. Design rule determining means for determining whether the new design data or manufacturing data and the spiral via comply with the design rule indicated in the design rule information when inserting the design data or manufacturing data. Referencing the table stored in the storage means when the design rule determining means determines that the table does not comply with the design rule, and within the allowable range of the table so as to comply with the design rule. Deforming means for deforming the spiral via. Spiral via design apparatus in printed circuit board design device to. 5. A printed circuit board design apparatus as a CAD system assisted by a computer for designing a printed circuit board layout diagram, comprising: graphic information; logical information including design rule information;
Storage means for storing a table having a shape, an arrangement position and an allowable range of a spiral via for each layer of the printed circuit board; and a printed circuit board layout diagram is displayed by referring to graphic information and logical information stored in the storage means. Along with
Display means for displaying spiral vias for each layer of the printed circuit board in the printed circuit board layout diagram with reference to the table stored in the storage means; and a new printed circuit board layout diagram displayed on the display means. When performing wiring, a design rule determining unit that determines whether the new wiring and the spiral via comply with a design rule indicated in the design rule information, and the design rule determining unit Deforming means for deforming the spiral via within the permissible range of the table so as to comply with the design rule by referring to the table stored in the storage means when it is determined that the spiral via does not comply with the design rule; Spiral via in printed circuit board design apparatus characterized by having Total equipment. 6. A printed circuit board design apparatus, which is a CAD system assisted by a computer for designing a printed circuit board layout diagram, comprising: graphic information; logical information including design rule information;
Storage means for storing a table having a shape, an arrangement position and an allowable range of a spiral via for each layer of the printed circuit board; and a printed circuit board layout diagram is displayed by referring to graphic information and logical information stored in the storage means. Along with
Display means for displaying spiral vias for each layer of the printed circuit board in the printed circuit board layout diagram with reference to the table stored in the storage means; and a new printed circuit board layout diagram displayed on the display means. Design rule determining means for determining whether a new component layout and the spiral via comply with a design rule indicated in the design rule information when arranging the component, and the design rule When the determining means determines that the spiral via is not in accordance with the design rule, it refers to the table stored in the storage means, and determines the spiral via in the allowable range of the table so as to comply with the design rule. And a deforming means for deforming the printed circuit board. Lal via design apparatus. 7. A printed circuit board design apparatus as a CAD system assisted by a computer for designing a printed circuit board layout diagram, comprising: graphic information; logical information including design rule information;
Storage means for storing a table having a shape, an arrangement position, and an allowable range of a spiral via for each layer of a printed circuit board; an arrangement position instructing means for instructing a reference arrangement position of a spiral via; Referring to the stored graphic information and logical information, and displaying the printed circuit board layout diagram,
Display means for referring to the table stored in the storage means, and displaying spiral vias for each layer of the printed circuit board in the printed circuit board layout diagram according to a reference arrangement position designated by the arrangement position designating means; According to the reference arrangement position designated by the arrangement position designation means, when displaying spiral vias for each layer of the printed circuit board of the printed circuit board layout diagram,
A design rule judging unit for judging whether or not the design rule indicated in the design rule information is complied with, and when the design rule judging unit judges that the design rule is not complied with, is stored in the storage unit. And a deforming means for deforming the spiral via within the permissible range of the table so as to comply with the design rule with reference to the table. apparatus. 8. A printed circuit board design apparatus as a CAD system assisted by a computer for designing a printed circuit board layout diagram, comprising: graphic information; logical information including design rule information;
Storage means for storing a table having a shape, an arrangement position, and an allowable range of a spiral via for each layer of a printed circuit board; an arrangement position instructing means for instructing a reference arrangement position of a spiral via; Referring to the stored graphic information and logical information, and displaying the printed circuit board layout diagram,
Display means for referring to the table stored in the storage means, and displaying spiral vias for each layer of the printed circuit board in the printed circuit board layout diagram according to a reference arrangement position designated by the arrangement position designating means; Referring to the table stored in the storage means, a table display means for displaying the table, and a layout position of the printed circuit board in the printed circuit board layout diagram according to a reference layout position designated by the layout position designating means. When displaying spiral vias for each layer, when performing new wiring on the printed circuit board layout diagram displayed on the display means, and when arranging new components on the printed circuit board layout diagram displayed on the display means The design rules indicated in the design rule information when performing A design rule judging unit for judging whether or not the design rule is judged not to be in accordance with the design rule, by referring to the table stored in the storage unit, Deforming means for deforming the spiral via within the allowable range of the table; spiral via indicating means for indicating a spiral via displayed on the display means; and the table stored in the storage means. And a spiral via editing means for editing the spiral via indicated by the instruction means, and a table editing means for editing the table displayed on the table display means. Spiral via design equipment in board design equipment. 9. A printed circuit board design apparatus, which is a CAD system assisted by a computer for designing a printed circuit board layout diagram, wherein first designating means for designating a range of a layer of a printed circuit board on which a spiral via is to be arranged. Second designating means for designating a shape and an arrangement position of the spiral via of a layer serving as a reference of the printed circuit board; and changing a shape of the spiral via of a layer other than the reference layer of the printed circuit board. Third designating means for designating, and between each layer of the printed circuit board,
An arrangement position setting means for setting an arrangement position of the spiral via so as to cause a predetermined deviation of the via, the spiral via designing apparatus in a printed circuit board designing apparatus.