JPH06309410A - Device for automatically arranging parts of printed circuit board - Google Patents

Abstract

PURPOSE:To improve the wiring efficiency of a printed circuit board by generating an interference checking graphic considering the number of wired channels. CONSTITUTION:A number of wired channels calculating means 1 calculates the number of wired channels necessary for parts to be arranged. A minimum clearance value calculating means 2 calculates a minimum clearance value necessary for securing the number of wired channels. An interference checking graphic registering means 3 finds out a minimum rectangle circumscribed with the outline of a part to be arranged an and registers a rectangle larger than the minimum rectangle only by the minimum clearance value as the inference checking graphic of the part to be arranged. A part arranging means 4 arranges the parts to be arranged so that the inference checking graphics of plural parts to be arranged are not mutually superposed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed wiring board design, and more particularly to a printed wiring board component automatic placement apparatus for designing the placement of components mounted on a printed wiring board.

[0002]

2. Description of the Related Art Conventionally, in this type of printed wiring board component automatic placement device, placement design has been performed with a constant minimum clearance value for all components. Therefore, an interference check graphic for securing a minimum clearance value that is a constant value is generated, and parts are arranged (arrangement design) based on the interference check graphic (for example, "area set calculation method ( Japanese Unexamined Patent Publication No. 1-084376
No.) "is introduced the conventional method of interference check figure generation).

Generally, a component having a larger number of pins used requires a larger number of wiring channels between adjacent components. Further, the number of wiring channels of a certain component can be increased as the interference check figure of the component is larger.

[0004]

In the above-described conventional printed wiring board component automatic placement device, the placement design is performed with a constant minimum clearance value for all components, and interference is caused without considering the number of wiring channels. Since a check figure is generated, when a component with a large number of pins used is placed on the printed wiring board, it becomes impossible to secure a sufficient number of wiring channels with other components, resulting in a shortage of wiring channels. As a result, there is a problem that the wiring rate of the entire printed wiring board is reduced.

In view of the above points, an object of the present invention is to automatically arrange printed wiring board parts capable of improving the wiring rate in a printed wiring board by generating an interference check figure in consideration of the number of wiring channels. To provide a device.

[0006]

An automatic placement apparatus for printed wiring board components according to the present invention calculates a wiring channel number calculating unit for calculating the number of wiring channels required for a placement target component and the wiring channel number calculating unit. Minimum clearance value calculating means for calculating the minimum clearance value required to secure the number of wiring channels, and the minimum clearance calculated by the minimum clearance value calculating means for determining the minimum rectangle circumscribing the external shape of the placement target component. An interference check graphic registration means for registering a rectangle larger than the minimum rectangle by the value as an interference check graphic of an arrangement target part and an interference check graphic of a plurality of arrangement target parts registered by this interference check graphic registration means are mutually And a component placement unit that places the placement target components so that they do not overlap.

[0007]

The present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the printed wiring board component automatic placement apparatus of the present invention.

The printed wiring board component automatic placement apparatus according to the present embodiment has a wiring channel number calculation means 1, a minimum clearance value calculation means 2, an interference check pattern registration means 3, a component placement means 4, and a wiring clearance table. 5 and an interference check graphic table 6 are included.

FIG. 2 is a flow chart showing the processing of the printed wiring board component automatic placement apparatus of this embodiment. This process
Number of used pins and pin arrangement row number calculation step 21, wiring channel number calculation step 22, minimum clearance value calculation step 23, minimum rectangle calculation step 24, minimum rectangle expansion step 25, and interference check figure registration step 26. An all-component processing end determination step 27 and an arrangement execution step 28.

FIG. 3 is a diagram for explaining a specific operation of the printed wiring board component automatic placement apparatus of this embodiment.

Next, with reference to FIGS. 1 and 2, the operation of the printed wiring board component automatic placement apparatus of the present embodiment configured as described above will be described.

When the components to be mounted on the printed wiring board are automatically arranged, the wiring channel number calculating means 1 is first activated. At this time, information indicating a plurality of components to be arranged is provided to the printed wiring board component automatic arrangement device of the present embodiment.

The wiring channel number calculating means 1 obtains the number of used pins of a component to be arranged (one of a plurality of components to be arranged) and the number of sides on which the pins are arranged (the number of rows of pin arrangement) ( Step 21).

Next, the wiring channel number calculating means 1 calculates the number of wiring channels by the following equation (1) based on the number of used pins and the number of pin arrangement rows obtained in step 21 (step 22). Number of wiring channels = number of pins used / number of rows of pin rows (1)

The minimum clearance value calculating means 2 calculates the minimum clearance value (minimum clearance value required to secure the number of wiring channels) that can secure the number of wiring channels obtained in step 22 by the following equation (2). Ask (step 23). Minimum clearance value = (number of wiring channels-1) x wiring channel interval + wiring clearance value ... (2)

The "wiring clearance value" referred to in the equation (2) is a value that is indispensable not only in the processing of the printed wiring board component automatic placement device of this embodiment but also in the processing of all wiring tools for the printed wiring board. Is. This wiring clearance value is the minimum clearance value between the wiring patterns, and it is assumed that the value is set in the inter-wiring clearance table 5 in advance.

The "wiring channel interval" referred to in the equation (2) is a value peculiar to the printed wiring board to be wired.

The calculation formula of the minimum clearance value corresponding to the arrangement target component is not limited to the formula (2),
Other calculation formulas can be applied in step 23 as long as the minimum clearance value required to secure the number of wiring channels calculated in step 22 can be obtained.

The interference check figure registration means 3 obtains a minimum rectangle circumscribing the external shape of the placement target component (step 2).
4) The minimum rectangle obtained in step 24 is set to step 2
It is expanded by the minimum clearance value calculated in step 3 (step 25). At this time, the direction of expansion corresponds to the number of pin-arranged rows obtained in step 21, and when the number of pin-arranged rows is 1 (when the side on which the pins are arranged is one side), the upward and downward directions. , Left direction or right direction only, two sides are vertical or horizontal directions, and four sides are vertical or horizontal four directions.

The interference check figure registration means 3 registers the rectangle enlarged in step 25 (the rectangle whose minimum rectangle is enlarged by the amount of the minimum clearance value) in the interference check figure table 6 as an interference check figure (step 2).
6). The interference check graphic table 6 is a table that is referred to in an automatic placement process by the component placement unit 4 described later.

The interference check figure registration means 3 determines whether or not the above-described processing of steps 21 to 26 has been repeated for all parts to be arranged (step 27).

When it is determined in step 27 that "there are some parts that have not been processed", the interference check pattern registration means 3 returns the control to the processing of step 21 by the wiring channel number calculation means 1.

If it is determined in step 27 that "processing has been completed for all parts", the interference check graphic registration means 3 shifts control to the processing of step 28 by the part placement means 4.

The component placement means 4 refers to the interference check graphic table 6 and places the components so that the interference check graphics of each component (placement target component) do not overlap (step 28). As a result, the components are arranged (automatically arranged) so that a larger number of wiring channels can be secured for the components having many used pins.

Next, with reference to FIG. 3, a specific mode of the processing of steps 21 to 26 will be described.

Here, it is assumed that the component 31 shown in FIG. 3 is a placement target component.

At step 21, the number of used pins "56" and the number of pin array rows "4" are obtained for the component 31.

In step 22, based on the equation (1),
The wiring channel number "14" is required.

In step 23, based on equation (2),
Minimum clearance value d corresponding to part 31 (see FIG. 3)
Is required.

In step 24, the smallest rectangle 32 circumscribing the outer shape of the component 31 is determined.

In step 25, the interference check figure 33 in which the minimum rectangle 32 obtained in step 24 is enlarged by the minimum clearance value d obtained in step 23
Is defined.

In step 26, the interference check graphic 33 defined in step 25 is registered in the interference check graphic table 6.

As a result of the above steps 21 to 26, in the placement process in step 27, the component 31 can be placed with the wiring channel region secured.

[0035]

As described above, according to the present invention, it is possible to improve the wiring rate in the printed wiring board by generating the interference check pattern in consideration of the number of wiring channels based on the number of pins used. There is.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a flowchart showing a process of the printed wiring board component automatic placement device shown in FIG.

FIG. 3 is a diagram for explaining a specific operation of the printed wiring board component automatic placement device shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wiring channel number calculation means 2 Minimum clearance value calculation means 3 Interference check figure registration means 4 Component placement means 5 Inter-wiring clearance table 6 Interference check figure table 21 Step number of used pins and pin arrangement row calculation step 22 Number of wiring channel calculation step 23 Minimum clearance value calculation step 24 Minimum rectangle calculation step 25 Minimum rectangle expansion step 26 Interference check figure registration step 27 All component processing end determination step 28 Placement execution step 31 Parts 32 Minimum rectangle 33 Interference check figure d Minimum clearance value

Claims (2)

[Claims] 1. A wiring channel number calculating means for calculating the number of wiring channels required for a placement target component, and a minimum clearance value necessary for securing the number of wiring channels calculated by the wiring channel number calculating means. A minimum clearance value calculating means for calculating and a minimum rectangle circumscribing the outer shape of the arrangement target component are obtained, and a rectangle larger than the minimum rectangle value by the minimum clearance value calculated by the minimum clearance value calculating means is the arrangement target component. Interference check figure registering means for registering as the interference check figure and the component placing means for arranging the placement target parts so that the interference check figures of the plurality of placement target parts registered by the interference check figure registering part do not overlap each other. A printed wiring board component automatic placement device comprising: 2. The minimum clearance value calculating means for calculating a minimum clearance value corresponding to an arrangement target component by a calculation formula of “(number of wiring channels−1) × wiring channel interval + wiring clearance value”. The printed wiring board component automatic placement device according to claim 1.