JPH01303567A - Parts symbol production for printed board cad - Google Patents

Abstract

PURPOSE:To facilitate the arrangement of parts by applying a mirror image process to the parts symbols to ensure the inversion of forms and performing the conversion of the layer information and the ASC by reference to a conversion table for production of the parts symbols. CONSTITUTION:The rear surface of a parts taken out of a parts library 1 undergoes the inversion of its form by a mirror image process. At the same time, the layer information and the ASC are converted by reference to a table 3 for production of a rear parts symbol. The produced front and rear parts symbols are stored in a memory 4. Then a parts and the inversion are instructed to a process block 2 at the stage of a wiring job, etc. Thus the block 2 reads the parts symbols out of the memory 4 and inverts the parts forms via the mirror image process. At the same time, the layer information and the ASC are inverted for production of the parts symbols of the opposite surfaces. The parts symbol data thus produced are stored in the memory 4. As a result, just a single type of parts information controlled by users suffices for a single parts.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a component symbol creation method for a double-sided printed circuit board model in a printed circuit board motion design system (a type of printed circuit board CAD system).

[Prior Art] Automatic printed circuit board design devices have been well known. In such devices, parts are usually entities (e.g. points, line segments, arcs, etc.) that have layer information (the front and back surfaces are separate layers and have different layer information), as shown in Figure 3. It is expressed as a set (referred to as a symbol) of entities E2 (via) that do not have 0 layer information.

If you try to place such a part on the front and back sides of a printed board, you can obtain a diagram of the front side layout by using that information as is for the front side, and by inverting the back side using mirror image processing of the part. You can get the back layout. In other words, the back side layout shown in FIG. 4(b) can be obtained from the front side layout shown in FIG. 4(a).

[Problems to be Solved by the Invention] However, in such mirror image processing, layer information such as line segments and arcs on the back side is unchanged from that on the front side. In this case, since the silk diagram is searched and output based on the layer information, there is a problem that the silk diagram on the back side is also output.

In order to avoid this, conventionally, even if the same part is used, both a part for the front side and a part for the back side are prepared.

However, such a method has the following problems.

It is necessary to prepare two symbols for 01 types of parts.

It is not possible to easily perform reversal processing from the front side to the back side or vice versa.

The object of the present invention has been made in view of the above points, and is to provide an automatic printed circuit board design device that allows one type of component to be managed regardless of the placement surface, and that allows both front and back surfaces of one component to be managed. To provide a component symbol creation method for an automatic printed circuit board design device which allows easy reversal processing.

[Means for solving the problem] In order to achieve such an object, the present invention provides (1)
When building a printed circuit board model horizontally from the component information registered in the component library, the back component symbol is created using the mounting surface information of the component taken out from the component library as is, and the back component symbol is created using the previously created component information. Using the data of the back part symbol that was created, create the shape of the back part symbol by inversion conversion using mirror 1 image processing, and create the back part symbol by converting the layer information and ASC by referring to the conversion table. 2) When changing the created back part symbol or back part symbol to the front or back side, perform I+1@ processing on the part symbol to invert the shape, and then convert the layer information and ASC by referring to the conversion table. The present invention is characterized in that a part symbol is created by

Example] FIG. 1 is a flowchart of the principle of the method of the present invention. Figure 1 (a
) shows the flow when horizontally building a printed circuit board model, as shown in Figure 1 (
b) shows the flow when reversing the front and back sides using the component symbols of the created board model.

(1) When horizontally building a printed circuit board model ■Know the types of parts required from the parts information in the connection information,
Extract these one by one from the parts library.

(2) Regarding the horizontal construction of components, back component symbols are created for the front surface as is, according to the component mounting control information added to the connection information, which is one of the control information in the printed circuit board model. For the back side, the shape is reversed by mirror image processing, and at the same time, the layer information and AS are checked by referring to the conversion table.
Create a back part symbol by converting C. Here,
ASC is a code number that includes the size of a pad in each layer, and a via has this ASC as information.

(2) When flipping the front and back sides of the created board model using component symbols In the board model created by the method (1) above, it is necessary to transfer the back side parts or back parts to the opposite side due to wiring constraints, etc. There are cases where there is.

In such a case, create a component symbol using the following method.

When creating a back part symbol from a back part symbol, the back part symbol is mirror-imaged to invert its shape, and further layer information and ASC are converted using a conversion table to create the back part symbol.

Conversely, when creating a back part symbol from a back part symbol, perform mirror image processing on the back part symbol to invert the shape, and then convert the layer information using the conversion table, in the same way as above.
Perform ASC conversion to create a back part symbol.

FIG. 2 is a functional block diagram of main parts of an automatic printed circuit board design apparatus for carrying out the method of the present invention. In FIG. In the block, pudding 1~
Processing is performed when horizontally building the board model, and processing is performed to convert the component symbols of the created printed circuit board model from front to back or vice versa to create desired component symbols.

3 is a table for converting layer/information and ASC,
Referenced by the processing block when converting a part symbol.

Reference numeral 4 denotes a memory in which printed circuit board model information is stored, and back component symbols created by the processing block 2, data related to the back component symbols, and the like are stored.

In such a configuration, when constructing a printed circuit board model, the type of required component is known from the component information in the connection information, and each la is extracted from the component library 1 (this is done by a block not shown). The processing block that receives the mounting surface information of the parts retrieved from library 1 creates a back part symbol by using the data as is without conversion processing for the parts to be mounted on the front side, and creates a back part symbol for the part mounted on the back side. The shape is inverted by image processing, and the layer information and ASC are converted with reference to Table 3 to create a back part symbol.

The created back part symbol and back part symbol are stored in memory 4.
Store it in

Thereafter, at the stage of wiring work, etc., it may be necessary to change the back side components to the back side or vice versa. In this case, when the processing block 2 is instructed to select a part and "invert", the processing block reads the symbol of the part from the memory 4, inverts the shape by mirror image processing, and converts the slag information and ASC to display the part on the opposite side. Creating a Part Symbol 0 The created part symbol data is stored in the memory 4.

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

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

■One type of component can be managed as information in the component library without having to be aware of whether it is placed on the front or back side, eliminating hassle and mistakes.

■The task of reversing a part from front to back can be done by simply indicating the part and commanding ``reverse'', making the work of arranging the parts easier.

[Brief explanation of the drawing]

Fig. 1 is a flowchart of the principle of the method of the present invention, Fig. 2 is a functional block diagram of main parts in an automatic printed circuit board design device for implementing the method of the present invention, Fig. 3 is a diagram showing an example of component symbols, Figure 4 is! FIG. 6 is an explanatory diagram for explaining a case of inversion by Jl image processing. 1... Parts library, 2... Processing block, 3...
...Table, 4...Memory. Figure 1
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Claims (1)

[Claims] A method for creating front part symbols and back part symbols in an automatic printed circuit board design device, which provides: (1) When constructing a printed circuit board model from component information registered in a parts library, front part symbols The symbol is created using the mounting surface information of the component extracted from the component library as is, and the back component symbol is created using the data of the front component symbol created above, and the shape of the back component symbol is changed by inversion conversion using mirror image processing. At the same time, create a back part symbol by referring to the conversion table and converting the layer information and ASC. (2) When changing the created front part symbol or back part symbol to the front or back side, the part concerned. A method for creating a component symbol for an automatic printed circuit board design device, characterized in that a symbol is mirror-imaged to invert its shape, and further layer information and ASC are converted by referring to a conversion table to create a component symbol. .