JP2002041585A - Designing method for electronic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the relation of the component of a wiring board and a case or the like suitably designable on the wiring board, on which parts are packaged. SOLUTION: When packaging components 3-6 on a printed wiring board 2 provided inside a case 1, the data of the components 3-6 are previously combined in a three-dimensional state to the data of the printed wiring board 2 and further three-dimensionally combined with the information of the case 1 in such a state so that it can be examined whether the relation of the components 3-6 and the case 1 is suitably located or not.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for designing an electronic device, and more particularly to a method for mounting electronic components on a wiring board so that the relationship between components of the wiring board and a case can be appropriately designed. The purpose is to do so.

[0002]

2. Description of the Related Art Usually, a wiring board uses a two-dimensional CAD system, while a case in which a wiring board is stored is a three-dimensional CAD system.
Designed using the system. In the design of printed wiring boards, two-dimensional components are grouped into two-dimensional graphic elements such as component external shapes, land shapes, resist shapes, silk shapes, and automatic inserter head / cutter shapes, automatic mounting machine head shapes, and lead wire shapes. The figures are registered in the database in advance, and then input together with the outer shape of the wiring board and the shape of the copper foil pattern using a two-dimensional CAD system. After the editing, the designing of the wiring board is completed. In case design, three-sided view input of the case, wireframe model development, and surface model development are performed, a solid model is created, and the design is completed.

[0003] Wiring board data processed using a two-dimensional CAD system is usually composed of graphic elements and graphic element groups. Similarly, the case shape data processed by using the three-dimensional CAD system is composed of graphic elements and graphic element groups.

[0004] Usually, two-dimensional and three-dimensional
When performing dimensional data exchange, these graphic elements and graphic element groups are decomposed into minimum graphic elements, the element information is written to a file according to an information exchange format, and the file is read by a three-dimensional CAD system to exchange information. There is a technique of converting to a graphic element again according to the format for use. The two-dimensional shape data having the graphic elements and the graphic element groups processed by the two-dimensional CAD system are developed into the minimum graphic elements when the information exchange format file is written, and the graphic elements such as element names, coordinate values, center points, and rotation angles are obtained. Information is output to a file. Thereafter, the file is read into a three-dimensional CAD, restored to a two-dimensional graphic element on a three-dimensional CAD system, and then a three-dimensional graphic element is added.

[0005] Thereafter, the wiring board data and the case data are combined on a three-dimensional CAD system to check for interference between parts on the wiring board and the case, an automatic mounting / inserting machine head / cutter on the front and back of the wiring board, and manufacture of lead wire shapes. Checking standards.

[0006]

In the above conventional example, when checking interference between components on a wiring board and a case, and checking manufacturing standards on the front and back of the wiring board, the external shape of a component developed on a CAD system of a different model is used. , Land shape, resist shape, silk shape, automatic insertion machine head cutter shape, automatic mounting machine head shape, lead wire shape, etc. are disassembled into graphic elements and cannot be moved in parts, so parts can be displayed on the screen When performing a detailed check by moving the above, sufficient check accuracy was not obtained. SUMMARY OF THE INVENTION An object of the present invention is to make it possible to appropriately design the relationship between components of a wiring board and a case.

[0007]

In order to achieve the above object, the present invention provides a method for registering in a two-dimensional CAD system.
The registered name of the three-dimensional part figure and the registered name of the three-dimensional part figure registered by the three-dimensional CAD system are the same part and the same name, and the parts are mounted on the wiring board provided in the case. It is intended to examine whether the relationship between the component and the case is appropriately arranged by combining the component data in a three-dimensional state and further combining the case information and the three-dimensional data in that state.

As a result, a reliable design can be performed.

[0009]

FIG. 1 shows an electronic apparatus according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a resin case, in which a printed wiring board 2 is fixed. A plurality of components 3, 4, 5, and 6 are provided on the front and back surfaces of the printed wiring board 2, respectively. Of these parts 3 to 6, part 4 is very tall, and this tall part 4 is the case 1
And only a small gap can be formed between them.
That is, if the clearance is not sufficient, the printed wiring board 2 cannot be properly mounted in the case 1. Thus, it is necessary to confirm in advance at the design stage whether the relationship between the component 4 and the case 1 is appropriate. FIG. 2 shows the design method. First, FIG.
In the figure, the CAD system of the Bunont wiring board 2 is written on the left side, data on the components 3 to 6 are registered in the center, and information on the case 1 is written on the right side. First, as shown in FIG. 2, in the printed circuit board CAD system, a wiring board design is started at 7, a two-dimensional component graphic is created at 8, a board outline coordinate is input at 9, and a board outline coordinate is input at 10. Input of component arrangement coordinates, input of pattern coordinates at 11, check of design criteria at 12, extraction of component information at 13, writing of file at 14. In this state, the information of the parts 3 to 6 is registered as a part figure at 15 in FIG. 2, and based on the information, a three-dimensional part figure is created at 16. On the other hand, the housing design of the case 1 is started in part 17, a three-view drawing input is made in 18, a wire frame is developed in 19, a surface model is developed in 20, and a solid model is developed in 21. In the case where the writing of 14 files has been performed in such a state, the file transfer is performed at 23
Done in parts. This 23 portion is a file read, and thereafter, a part graphic arrangement command procedure file is created in 24, and a part arrangement process is performed in 25 based on the data from the three-dimensional part graphic creation performed in 16. Then, at 26, a graphic synthesis of the component arrangement information at 25 and the development of the solid model at 21 is performed. 27, an interference check, specifically, the part 4 and the case 1 in FIG.
The information between them is checked. At 28, a manufacturing standard check is performed, and at 29, the process ends. That is, in the state where the process has been completed, an appropriate gap is secured between the case 1 and the large part 4 as shown in FIG. 1, and in such a state, an appropriate electronic device is completed. Things.

In FIG. 2, * 1 to * 6 are additionally described as follows. * 1: Since information is exchanged in a simple text file, it can be processed by most CAD systems, and is versatile. * 2: Since electrical components are registered as three-dimensional component graphics on the mechanical CAD system, they can be freely moved in component units. Therefore, interference check from all angles can be performed by moving and rotating the component. * 3: The two-dimensional part graphic (printed circuit board CAD) and the three-dimensional part graphic (mechanical CAD system) have the same part graphic name. * 4: Since a complete three-dimensional part figure is arranged, simulation of automatic insertion and mounting can be easily performed. * 5: Contents of data output to text file. A very simple text file. * 6: Create and mount a procedure file for automatic component placement based on component graphic information. These processes do not require the creation of a special program, and list component placement commands for the mechanical CAD system.

[0011]

As described above, according to the present invention, the information of the wiring board is previously combined with the three-dimensional information of the components mounted on the wiring board, and the wiring board on which the components are mounted is incorporated into the case. The relationship between the parts of the wiring board and the case when combined with each other was confirmed, and an appropriate design was performed.

[Brief description of the drawings]

FIG. 1 is a sectional view of an electronic device manufactured according to an embodiment of the present invention.

FIG. 2 is a CAD data diagram showing design information.

[Explanation of symbols]

 1 case 2 printed wiring board 3,4,5,6 parts

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masahiro 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. Term (reference) 5B046 AA08 DA09 FA07

Claims (1)

[Claims] In a method of designing an electronic device comprising a case, a wiring board housed in the case, and components mounted on the wiring board, the wiring board is designed by a computer using a two-dimensional component. Create a figure, then input the coordinates of the external shape of the wiring board, the coordinates of the parts arrangement, and the coordinates of the wiring pattern in order,
After that, the design criteria are checked and the processing is completed, and the part graphics are separately registered by the computer, and the external shape of the parts and the back surface information of the wiring board are made the same as the names of the two-dimensional part figures.
Create a 3D part figure, input a three-sided view as a design of the case separately with a computer, develop a wire frame model, develop a surface model, and develop a solid model, finish the design of this case, and design the wiring board After creating the part figure placement instruction procedure based on the information,
A method of designing an electronic device in which component graphic information is read and component placement processing is performed, case design information is read, graphic synthesis is performed, and interference between the component and the case is checked before manufacturing standards are checked.