JPH0821041B2 - Printed circuit board CAD parts symbol creation method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a printed circuit board automatic designing device (printed circuit board).
The improvement of the part symbol creation method for the double-sided mounting printed circuit board model in a CAD system).

[Prior Art] Conventionally, a printed circuit board automatic designing device is well known. In such a device, the component is usually an entity E1 (point, line segment, arc, etc.) having layer information (the front and back surfaces are different layers and the layer information is different) as shown in FIG. , And is represented as a set (called a symbol) of entities E2 (via) that do not have layer information.

If you try to place such a part on the front and back of the printed board, you can get a diagram of the front side by using the information as it is on the front side, and by inverting it using mirror image processing of the part on the back side. It is possible to obtain a rear surface layout drawing. That is, the rear surface layout shown in FIG. 4B can be obtained from the front surface layout shown in FIG.

[Problems to be Solved by the Invention] However, in such mirror image processing, layer information such as line segments and arcs on the back surface is not different from that on the front surface arrangement. In that case, since the silk diagram is searched and output based on the layer information, the silk diagram on the back side is also output.

In order to avoid this, conventionally, both the same component and the component dedicated to the front surface and the component dedicated to the back surface are prepared. However, such a method has the following problems.

It is necessary to prepare two symbols for one type of part.

Inversion processing from the front side to the back side or vice versa cannot be easily performed.

The object of the present invention is made in view of such a point, and in the printed circuit board automatic designing apparatus, one component can be managed by one type regardless of the arrangement surface, and one component can be managed on the front surface and the back surface. It is an object of the present invention to provide a method of creating a component symbol for a printed circuit board automatic designing device, which enables easy inversion processing.

[Means for Solving the Problems] In order to achieve such an object, in the present invention,
(1) When a printed circuit board model is constructed from the component information registered in the component library, the front component symbol is created by using the mounting surface information of the component extracted from the component library as it is, and the back component symbol is defined as the above. A conversion table that uses the created front part symbol data to create the shape of the back part symbol by reversal conversion by mirror image processing, and sets the layer information and pad size information for the front part and the back part in advance. To obtain the information on the back part symbol including the layer information and the size of the pad by referring to, to create the back part symbol, (2) When changing the created front part symbol or back part symbol to the back surface or the front surface , The part symbol is mirror-image processed to invert the shape, and the layer information and pattern Characterized in that so as to create a component symbol for information including the size of the de.

[Example] FIG. 1 is a principle flow chart of the method of the present invention. Fig. 1 (a) shows the flow when building a printed circuit board model.
The figure (b) shows the flow at the time of front and back inversion using the component symbol of the created board model, respectively.

(1) When building a printed circuit board model Know the types of parts required from the part information in the connection information,
This is taken out one by one from the parts library.

Regarding the construction of the parts, according to the part mounting control information added to the connection information which is one of the control information in the printed circuit board model, the front part symbols are created as they are for the front side. For the back side, the shape is inverted by mirror image processing, and at the same time, the layer information and ASC are referenced by referring to the conversion table.
Convert back to create back part symbol. Where AS
C is information such as the size of the pad in each layer and the connection relationship, and via has this ASC as information. In the conversion table, layer information about the corresponding front part symbol and back part symbol, pad size,
The connection relationship and other predetermined information are correspondingly set in advance.

(2) When reversing the front and back using the component symbol of the created board model In the board model created by the method of (1), it is necessary to move the front or back part to the opposite surface due to wiring restrictions and the like. There may be In such a case, the component symbol is created by the following method.

When creating the back part symbol from the front part symbol,
The front part symbol is subjected to a mirror image process to invert the shape, and further the layer information and the ASC are converted by the conversion table to create the back part symbol.

Conversely, when creating a front part symbol from the back part symbol, mirror image processing is applied to the back part symbol to perform shape inversion, and the layer information and ASC are converted by the conversion table and displayed as described above. Create a part symbol.

FIG. 2 is a functional block diagram of essential parts in a printed circuit board automatic designing apparatus for carrying out the method of the present invention. In the figure, 1 is a component library in which mounted component data having various kinds of information is stored, and 2 is a processing block, which is a process block at the time of constructing a printed circuit board model and the generated component symbol of the printed circuit board model from front to back, or Processing for converting to the opposite and creating a desired part symbol is performed.

Reference numeral 3 is a table for converting layer information and ASC, which is referred to by a processing block when converting a component symbol.

4 is a memory for storing printed circuit board model information,
Data and the like relating to the front part symbol and the back part symbol created by the processing block 2 are stored.

With such a configuration, when the printed circuit board model is constructed, the type of required component is known from the component information in the connection information, and this is taken out one by one from the component library 1 (this is performed by a block not shown). The processing block that receives the mounting surface information of the component retrieved from the component library 1 creates the front component symbol using the data as it is without converting the component mounted on the front surface, and the mirror image processing for the rear surface. Then, the shape is inverted and the layer information and ASC are converted by referring to Table 3 to create the back part symbol. The created front part symbol and back part symbol are stored in the memory 4.

After that, at the stage of wiring work, etc.
Or vice versa, it may be necessary to change. In this case, when the component and "invert" are instructed to the processing block 2, the processing block reads the symbol of the component from the memory 4, inverts the shape by mirror image processing, converts layer information and ASC, and displays Create a part symbol. The created part symbol data is stored in memory 4
Stored in.

In this way, the front part symbol and the back part symbol can be created. In this case, since the front part symbol information and the back part symbol information are automatically created and managed in the device, the part information managed by the user (information stored in the part library 1) is one type for one part. Information will be good. There is no need to manage the two types of parts information as in the conventional case.

[Effects of the Invention] As described above, the present invention has the following effects.

For one type of component, it is possible to manage only one type of information in the component library without paying attention to whether it is arranged on the front surface or the back surface.

The front and back reversing work of the parts can be done simply by designating the parts and instructing the "reversal".

[Brief description of drawings]

FIG. 1 is a flow chart of the principle of the method of the present invention, FIG. 2 is a functional block diagram of essential parts in a printed circuit board automatic designing apparatus for carrying out the method of the present invention, and FIG. 3 is a diagram showing an example of a component symbol. FIG. 4 is an explanatory diagram for explaining the case of inversion by mirror image processing. 1 ... parts library, 2 ... processing block, 3 ... table, 4 ... memory.

Claims (1)

[Claims] 1. A method of creating a front part symbol and a back part symbol in a printed circuit board automatic designing apparatus, comprising: (1) a front part symbol when a printed board model is constructed from part information registered in a parts library. Is created by using the mounting surface information of the parts extracted from the parts library as it is, and for the back part symbol, the shape of the back part symbol is created by inversion conversion by mirror image processing using the data of the created front part symbol. At the same time, the conversion information in which the layer information and the information including the pad size are set in advance for the front component and the back component is referred to obtain the information regarding the back component symbol including the layer information and the pad size. Create a symbol, and (2) change the created front part symbol or back part symbol to the back side or front side. In this case, the part symbol is mirror-image-processed to invert the shape, and the part symbol is created by obtaining information including layer information and pad size by referring to the conversion table. Method of creating parts symbol for printed circuit board automatic designing equipment.