JP2531084B2 - Parts gap check device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a component gap checking device for checking a gap between components mounted on a printed circuit board when designing the layout of the printed circuit board, and more particularly to a constraint for automating mounting of components on the printed circuit board. The present invention relates to a component clearance check device for performing a clearance check, which is taken into consideration during layout design.

[0002]

2. Description of the Related Art In recent years, in the field of printed circuit board manufacturing, automation of the mounting of components on the printed circuit board (hereinafter referred to as "component device automation") has been promoted (as a manifestation of the promotion of component mounting automation, Many technologies relating to the automation of component mounting such as Kaihei 3-104398 (link connection method for wiring boards) and "JP-A-3-19707 (hole punching device for printed wiring boards)" have been published).

In order to realize such automated parts mounting, a clearance check is performed in order to comply with the constraint "automatically mounted parts should be kept above a permissible clearance value" which is a constraint caused by the automated parts mounting when designing the layout of a printed circuit board. Need to do. Here, the "allowable interval value" as a constraint generated by the component mounting automation is, for example, NC (Numerical Control) used for the component mounting automation.
This is the part gap that should be ensured so that the arm of the device does not come into contact with parts or terminals of parts.

Conventionally, a component clearance check device for performing this kind of clearance check has only one allowable clearance value.

Therefore, in order to automate the component mounting, it is necessary to set and check the allowable gap value in accordance with the component group (combination of two components) that requires the largest component gap.

[0006]

The above-described conventional component gap check device has only one allowable gap value, and the component set that requires the largest component gap in order to automate the component mounting. Since it is necessary to set and check the allowable gap value according to the above, there is a problem that the mounting density of the entire printed circuit board decreases.

Conversely, if priority is given to increasing the mounting density of the entire printed circuit board, there is a problem that automation of component mounting cannot be realized and component mounting is obligatory by the conventional manual work. .

In view of the above points, an object of the present invention is to provide a component gap checking device which enables high-density mounting of components on a printed circuit board while considering realization of automatic component mounting.

[0009]

SUMMARY OF THE INVENTION A component gap checking device of the present invention is a component gap checking device for checking a gap between components mounted on a printed circuit board. The component group number of one component and the component of the other component. The allowable gap table that stores the allowable gap value defined by the group number and the combination of the mounting directions of both components, and the component group number, mounting direction, placement coordinate, and shape number of each component mounted on the printed circuit board are stored. A parts table, a shape table that stores coordinates indicating the shape in the reference mounting direction (mounting direction of “0 ° rotation”) corresponding to each shape number, and an allowable gap that corresponds to the part set related to the instruction of the check target part set. Allowable gap selecting means for obtaining a value with reference to the allowable gap table and the parts table, the parts table and the shape The gap value between the two parts forming the part set related to the instruction of the check target part set is calculated with reference to the table, and the calculation result is compared with the allowable gap value obtained by the allowable gap selecting means. And a permissible gap checking means for checking whether or not the layout is designed so that the gap value is equal to or larger than the permissible gap value.

In addition, in the component gap check device of the present invention, instead of the component table and the shape table, the component group number of each mounted component, the mounting direction, the arrangement coordinates, and the coordinates indicating the shape in the standard mounting direction are stored. It is also possible to provide a parts / shape table.

[0011]

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

FIG. 1 is a block diagram showing the construction of an embodiment of the component gap checking apparatus of the present invention. The component gap checking device of this embodiment is configured to include an allowable gap selection unit 11, an allowable gap table 12, a component table 13, a shape table 14, and an allowable gap check unit 15. Further, the component gap check device of this embodiment is
Input the instruction of the set of parts to be checked and output the check result.

FIG. 2 is a diagram showing an arrangement state of a group of parts to be checked (four parts A to D mounted on a printed circuit board). That is, it is assumed that the gap check is performed by the component gap check device according to the present embodiment with respect to the group of components whose layout is designed to be in this layout state. Note that, as shown in FIG. 2, the component group number of the component A is "1", the component group number of the component B is "2", and the component group number of the component C is "2". , The part group number of the part D is “3”. Here, the component group number refers to the identification number of each component group when the components are divided into groups by paying attention to the "shape of the component" and the "arrangement of the terminals of the component" which influence the allowable gap value.

FIG. 3 is a diagram showing an example of the contents of the allowable gap table 12.

The permissible gap table 12 is a table used for obtaining the permissible gap value of the set of parts to be checked. That is, the part group number of one part,
The allowable gap value defined by the component group number of the other component and the combination of the mounting directions of both components (mounting direction on the printed circuit board) is stored.

That is, the permissible gap table 12 contains the "part group number of one part", which is the information of the first dimension.
It is a table composed of "component group number of the other component" which is information of the second dimension and "combination of mounting directions of both components" which is information of the third dimension. However, in the present embodiment, it is considered that the “combination of mounting directions of both components” is a combination of reference mounting directions (mounting directions of “0 ° rotation”), and the third dimension information is considered. Will not be described or illustrated. The information on the mounting direction is, for example, “0 ° / 90 ° / 180 ° / 270 °
It is possible to set the information "rotate and mount".

Cmn (m and n are positive integers and m ≧ n) in FIG. 3 are the components belonging to the component group having the component group number m (the mounting direction of this component is the standard mounting direction), The allowable gap value between the component belonging to the component group having the component group number n (the mounting direction of this component is the standard mounting direction) is shown. As an example of the method of grouping the parts, DIP (Dual Inline) is used.
Package) type, SOP (Small Outli)
ne Package) type, PGA (PinGrid)
Array) type and QFP (Quad Flat P)
A grouping corresponding to the classification such as the ackage type can be considered.

FIG. 4 is a diagram showing an example of the contents of the parts table 13 and the shape table 14.

The component table 13 is provided for each printed circuit board, and stores the shape number, the arrangement coordinates, the mounting direction, and the component group number for each component mounted on the printed circuit board. The placement coordinates refer to the coordinates of a reference point for specifying the position of the component (for example, if the component is a rectangle, the center point of the rectangle).

The shape table 14 stores coordinates indicating the shape (coordinates indicating the shape in the reference mounting direction) for each shape number for specifying and identifying the shape of the component. The “coordinates indicating the shape” means, for example, the relative coordinate value of each vertex of the rectangle with respect to the reference point. As the shape table 14, the shape table conventionally used in the layout design of the printed circuit board can be used as it is.

Next, the operation of the component gap check device of this embodiment having the above-mentioned structure will be described.

At the time of layout design, when an instruction of a set of parts to be checked is given from the outside, the part gap checking device of this embodiment is activated. Here, the “instruction of the check target component set” refers to an instruction indicating a storage location (storage location in the component table 13) of information regarding two components that form the check target component set.

First, the allowable gap selecting means 11 refers to the parts table 13 based on the instruction of the parts set to be checked, and extracts the part group numbers of the two parts.
At this time, the component group numbers are m and n, respectively, and m and n have a relationship of m ≧ n.

Next, the permissible gap selection means 11 refers to the permissible gap table 12 on the basis of the part group number extracted from the part table 13 and refers to the permissible gap value of the two parts (related to the instruction of the set of parts to be checked). The permissible gap value Cmn corresponding to the component set is taken out, and the permissible gap value Cmn is sent to the permissible gap checking means 15 together with the storage location of the information regarding the two parts constituting the part set to be checked. When the mounting direction of the two components is not the standard mounting direction, the allowable gap value Cmn is taken out in consideration of the mounting direction in the component table 13.

The allowable gap checking means 15 refers to the part table 13 to retrieve the shape number and the arrangement coordinate of the two parts, and refers to the shape table 14 to correspond to the shape number retrieved from the part table 13. The "coordinates indicating the shape" is taken out, and the gap value between the two parts is calculated based on the arrangement coordinates and the coordinates indicating the shape. In addition, the 2
When the mounting direction of one component is not the reference mounting direction, the above calculation is performed in consideration of the mounting direction in the component table 13.

Further, the permissible gap checking means 15 checks whether or not the layout is designed so that the gap value of the above calculation result is equal to or more than the permissible gap value Cmn, and the check result is notified to the outside (output). Then, a series of processing is completed.

Next, the specific operation of the component gap checking apparatus of this embodiment when designing the layout of the printed circuit board shown in FIG. 2 will be described with reference to FIGS.

In FIG. 2, it is assumed that the parts A, C and D are already arranged parts, and the part B is a part to be arranged.

What must be checked when arranging the part B is the gap value d between the parts A and B.
1, whether the gap value d2 between the component C and the component B and the gap value d3 between the component D and the component B are respectively maintained at or above the allowable gap value. Therefore, the "instruction of the check target component set" given to the allowable gap selecting means 11 is an instruction regarding the component set of the component A and the component B, an instruction regarding the component set of the component C and the component B, and a component D and the component. There are three instructions, that is, an instruction relating to a component set with B.

Since the part group number of the part A is "1" and the part group number of the part B is "2", the allowance between the parts A and B obtained by the allowance gap selecting means 11 is determined. The gap value is C21 (see the allowable gap table 12 in FIG. 3).

Therefore, the allowable gap checking means 15 performs the gap check based on the concept that "the relationship of d1≥C21 must be satisfied in order to place the part B at the position shown in FIG. 2". Done. Also,
Similarly, in the allowable gap checking means 15, d2 ≧ C22
A gap check is also performed to determine whether the relationship of d3 ≧ C32 is satisfied.

In the present embodiment, the case where the "coordinates indicating the shape" of each component forming the component set to be checked is specified by the component table 13 and the shape table 14 has been described. It is also possible to provide a parts / shape table as shown in FIG. 5 instead of 14, and to specify the “coordinates indicating the shape”.

As shown in FIG. 5, in the parts / shape table, instead of the shape number in the parts table 13, "coordinates indicating the shape" existing in the shape table 14 are stored.

Parts table 13 and shape table 14
The following is a comparison between the case where the present invention is realized by using (in the case of the embodiment shown in FIG. 1) and the case where the present invention is realized by using the parts / shape table. The former is superior to the latter in terms of the capacity of the table required to store the “coordinates indicating the shape”. The advantage is that the existing shape table is
Considering that it can be used as 4, it can be further emphasized. The latter is superior to the former in that the number of tables is reduced and the number of accesses to the table is reduced.

[0035]

As described above, according to the present invention, in the layout design of the printed circuit board, a plurality of permissible gap values are set for each combination of the component group number and the mounting direction to perform the gap check, thereby automating the component mounting. There is an effect that it is possible to realize high density mounting of components on a printed circuit board.

[Brief description of drawings]

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

FIG. 2 is a diagram for explaining a specific operation of the component gap check device shown in FIG.

FIG. 3 is a diagram showing an example of the contents of an allowable gap table in FIG.

FIG. 4 is a diagram showing an example of contents of a parts table and a shape table in FIG.

5 is a diagram showing the contents of a parts / shape table having the same information as the parts table and shape table shown in FIG.

[Explanation of symbols]

 11 Allowable Gap Selection Means 12 Allowable Gap Table 13 Parts Table 14 Shape Table 15 Allowable Gap Checking Means

Claims (2)

(57) [Claims] 1. A component gap checking device for checking a gap between components mounted on a printed circuit board, defined by a component group number of one component, a component group number of the other component, and a combination of both component mounting directions. The allowable gap table that stores the allowable gap value, the component group number of each component mounted on the printed circuit board,
A parts table that stores the mounting direction, placement coordinates, and shape number, a shape table that stores the coordinates that indicate the shape in the standard mounting direction that corresponds to each shape number, and the tolerance that corresponds to the parts set that is specified by the check target parts set. A permissible gap selecting means for obtaining a gap value by referring to the permissible gap table and the part table, and between two parts forming a part set related to an instruction of a part set to be checked by referring to the part table and the shape table. The gap value is calculated, and the calculation result is compared with the allowable gap value obtained by the allowable gap selecting means to check whether or not the layout is designed so that the gap value is equal to or larger than the allowable gap value. And a permissible gap checking means for controlling the gap between parts. 2. A component / shape table for storing a component group number of each mounted component, a mounting direction, an arrangement coordinate, and a coordinate indicating a shape in a reference mounting direction, instead of the component table and the shape table. The component gap check device according to claim 1.