JPH0315225B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pattern drawing device for drawing a pattern diagram of a printed circuit board, and particularly relates to an apparatus for printing a pattern of a printed circuit board onto paper using a plotter device. .

[Conventional technology]

When drawing a circuit pattern for a printed circuit board using a data processing device, the circuit pattern is drawn on paper using a plotter device in order to confirm the drawing result. .

In this case, the plotter device, for example,
As shown in the figure, an electrostatic plotter is used. In this electrostatic plotter, the electrostatic recording paper 20 is
1, when passing between the write head electrode 22 and the segment back electrode 23, the data input section 2
4, the write head electrode 22 is segmented.
A high voltage discharge is generated between the back electrode 23 and charges based on input data are accumulated on the electrostatic recording paper 20. The electrostatic recording paper 20 is the toner station 2
5, the toner is attracted to this charge, and after removing excess toner at a dry station 26, the toner is fused to the electrostatic recording paper 20. In this way, the circuit pattern designed on the electrostatic recording paper 20 can be output.

By the way, previous plotter devices could only output circuit pattern lines with a certain width, so even if the line sizes differ depending on the pattern, they can output lines of the same size. The image will be output as a line, giving an image different from the actual image. For this reason, recently, plotter devices have been developed that can change the size of a pattern to match the actual size and output it.

The circuit pattern of the printed circuit board includes a land L and a line pattern P, as shown in FIG. Fifth
The figure illustrates lands L ₀ and L ₁ and line patterns P ₀ and P ₁ . These lands L are to which components are connected or electrical connections are made to other circuits, and the line pattern P is to connect these lands L. The line pattern P also has a plurality of sizes. By the way, the coordinate system of the printed circuit board in FIG. 5 includes a main grid indicated by solid lines XX and YY, and sub-lattices indicated by AA, B-B, and CC. Furthermore, when outputting this circuit pattern using a plotter device, the pattern was output on these main grids and sub-grids.

This pattern is output in accordance with the procedure shown in the flowchart shown in FIG.

(1) First, find the physical pitch, that is, the actual size, of the main lattice X-X and Y-Y.

(2) Next, recognize the number of sublattices. From this, the physical pitch of the sublattice, that is, the actual pitch, is determined.

(3) Input the pattern data of the circuit pattern to be actually created on the printed circuit board.

(4) Based on the input design pattern data, convert it into pattern coordinates on the drawing for actually outputting it on recording paper.

(5) Then, find the pattern width of this pattern data to be output on recording paper.

(6) Draw each pattern with the pattern coordinates determined in (4) above using the pattern width calculated in (5) above.

(7) After performing these steps for all pattern data and performing coordinate conversion and pattern width calculation for all input data, output this to the data input section 24 shown in Fig. 4 and print it on the recording paper. The circuit pattern is output to 20.

[Problem that the invention seeks to solve]

By the way, at this time, as shown in FIG. 5, when drawing a circuit pattern on adjacent sub-grids A-A and B-B, when the pattern on B-B is large, the pattern on the adjacent sub-grid, for example A- There is a problem in that the signal is output in a state where it appears to be in contact with the circuit pattern A (the portion painted black in FIG. 5).
This also applies when circuit patterns are drawn on the sub-lattice lines BB and CC. In this way, the circuit patterns on A-A and B-B and the circuit patterns on C-C, which are not actually in contact, are output as if they were in contact, so there may be mistakes in the designed patterns. There was a problem with giving a false impression.

In other words, in the conventional printed circuit board pattern output method using a plotter device, the pattern running position is physically positioned on the main grid and sub-grid depending on the size of these grids. If a pattern is drawn with a width corresponding to the pattern, as shown in Figure 5, the patterns or patterns and lands will overlap, giving the designer a misunderstanding even though the actual patterns do not overlap. There are problems like giving. Furthermore, if the distance between the sub-grids is determined to be large so that the patterns do not overlap, the pattern image printed on the recording paper will become larger, resulting in wasted space.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention does not increase the distance between the sub-grids, and instead of ejecting the pattern in the state shown in FIG. 5, the pattern is ejected in the conventional manner. If there is a possibility of contact, the pattern is shifted from above the sub-grids and output between the sub-grids.
For this purpose, the printed circuit board pattern drawing device of the present invention has a coordinate system defined by the main grid and the sub grid, and the printed circuit board circuit has a coordinate system defined by the main grid and the sub grid, and the land pattern position and line pattern running position are defined based on this coordinate system. In an apparatus for drawing a pattern, a coordinate conversion means for converting the coordinate system of the printed circuit board into a drawing coordinate system, and a pattern determination means for determining a plurality of line patterns existing in the same main grid based on the drawing coordinates. , a line width determining means for determining the line width of the determined line pattern, and a drawing coordinate system of line patterns that are in contact with each other among the line patterns extracted by the pattern determining means and the line width determining means, The present invention is characterized by comprising a control means for shifting the line patterns by a predetermined amount in a direction in which the line patterns are separated from each other.

[Effect]

As a result, when the pattern has _three sub-lattices between the main grids as shown in FIG. As shown in FIG. 1B, the drawing can be outputted from the plotter device, so that the circuit patterns _P0 and _P1 will not be drawn in contact with each other.

〔Example〕

An embodiment of the present invention will be described based on FIGS. 1 to 3.

FIG. 1a is a configuration diagram of an embodiment of the present invention, FIG. 1b is an example of a printed circuit board circuit pattern output by the present invention, FIG. FIG. 2 is a detailed view of the pattern shift section, FIG. 2 is a pattern creation order explanatory diagram illustrating the operating order of the pattern drawing apparatus of the present invention, and FIG. 3 is a pattern creation control state explanatory diagram of the pattern creation procedure in the present invention.

In FIG. 1, 1 is a pattern data coordinate conversion section, 2 is a pattern drawing section, and 3 is a pattern shift section.

The pattern data coordinate conversion section 1 performs coordinate conversion for outputting design data onto recording paper. The coordinates on this recording paper are shown in Figure 1 c
As shown in FIG.
In the example shown in FIG. c, there are three sub-lattices between the main lattices. The coordinates of the main lattice and the sub-lattice are determined with the point 0 of 1,1 in the X-Y plane coordinates as the origin, as shown in FIG. 1c.

Here, the paper (pattern) used when designing a circuit pattern on a printed circuit board is a single pattern with only one sub-grid between the main grids, a double pattern with two sub-grids, and a pattern with two sub-grids. There are three types of three-line grids in which there are three grids, and the number of sub-grids between the main grids does not differ on the same paper. The line width of the circuit pattern is also logical line width 1, logic line width 2, and logic line width 3.
As shown in Figure 1c, there are three types of logical line widths: one with a width W ₂ between adjacent sub-lattices is 2, and one with a width W ₃ between three sub-lattices. The logic line width is 3, and _the logic line width 1 is the width W ₁ which _is smaller than the width W ₂ . The size is set so that they do not touch each other when touched, and is about 2/3 of W ₂ . When the circuit pattern runs diagonally, the X-axis or Y-axis
It is determined to run at an angle of 45 degrees, and it is determined that there are no two circuit patterns with a logic line width of 2 between the main grids. The circuit pattern with a logic line width of 2 is designed so that it does not exist in the sub-lattice C.

The pattern drawing section 2 is for creating data to be output by a plotter device, and performs shift control based on the judgment of the pattern shift section 3 for a pattern to be shifted from a pattern on a sub-grid to between sub-grids.

The pattern shift section 3 controls the shift of the pattern on the sub-lattice, and as shown in FIG. 1d,
Input data holding buffer 1 that holds input data
0, the pattern used in the design is the same as the one through 1
A pattern determination circuit 11 that determines whether the line width of the circuit pattern is one of three lines, and a logic line width determination circuit 1 that determines whether the line width of the circuit pattern is between the logic line width 1 and the logic line width 3.
2. The grids on which the circuit pattern runs are A, B,
A grid position determination circuit 13 that determines which of the grids is selected, a shift circuit 14 that shifts and controls the circuit pattern, a grid center control circuit 15 that controls the circuit pattern to be drawn at the center of the grid, and this pattern shift section is integrated. Control circuit 16 for controlling, AND circuits 17-0 to 17- for selectively outputting output data
2. It is composed of an OR circuit 18 and the like.

The operation of the pattern shift section 3, which is a characteristic part of the present invention, will be explained with reference to FIG.

(1) First, the pattern determination circuit 11 identifies how many lines of the printed circuit board pattern held in the input data holding buffer 10 is a continuous pattern. This determination result is reported from the pattern determination circuit 11 to the control circuit 16. As a result, the control circuit 16 reads out the data held in the input data holding buffer 10 as is. At this time, "1" is applied to the AND circuit 17-0 from the control circuit 16 and it is in the on state, so the data of this pattern is passed through the AND circuit 17-0 as it is.
0 and the OR circuit 18 to the pattern drawing section 2, and output on the sub-lattice written in the data. The image is drawn using a so-called basic drawing method.

(2) When the pattern judgment circuit 11 determines that the pattern to be drawn is not one line but two lines, the line width of this circuit pattern is determined by the logic line width judgment circuit 12 to be a logical line width of 1. Based on these determination results, the control circuit 16 turns on the AND circuit 17-0 and transfers the data in the input data holding buffer 10 to the AND circuit 17-0 and the OR circuit 18, as in (1) above.
Output via , and draw the image using the basic drawing method. However, if the logical line width is not 1, the line width is
Since the image is large like W ₂ or W ₃ and may be drawn in such a way that it comes in contact with a land, the control unit 16 processes the input data by the grid center control circuit 15 so that it is located at the center of the grid. AND circuit 17-
1 to control it to be in the on state. As a result, the input data is processed by the grid center control circuit 15, and the AND circuit 17-1
and is output via the OR circuit 18, so
The pattern drawing section 2 performs drawing processing so that this circuit pattern exists at the center of the grid.

(3) By the way, when the pattern determination circuit 11 determines that the pattern is a series of three lines, if the logic line width determination circuit 12 determines that the circuit pattern line width is a logic line width of 1, the control circuit 16, as in (1) above, turns on the AND circuit 17-0, outputs the data in the input input data holding buffer 10 via the AND circuit 17-0 and the OR circuit 18, and draws a picture using the basic drawing method. let Further, if the logical line width determination circuit 12 determines that the line width is logical line width 2, the control circuit 16 controls the shift circuit 1 according to the output of the grid position determination circuit 13.
4 is controlled as follows. That is, when the circuit pattern is located on the sub-lattice A, the control circuit 16 transmits the circuit pattern held in the input data holding buffer 10 to the shift circuit 14, and changes the logic line width on this sub-lattice A. 2 is shifted between the sub-grids A and B, and "1" is output to the AND circuit 17-2 to turn it on, and the data of the circuit pattern shifted between the sub-grids A and B is ANDed. Pattern drawing section 2 via circuit 17-2 and OR circuit 18
Based on this output, drawing control is performed so that the circuit pattern is located between sub-grids A and B. If the grid position determining circuit 13 determines that it is not on the sub-grid A, it means that it is located on the sub-grid B (as mentioned above,
(The circuit pattern is designed such that there is no circuit pattern with a logic line width of 2 on the sub-lattice C), and the control circuit 16 transmits this circuit pattern to the shift circuit 14.
As shown in FIG.
2 and the OR circuit 18 to the pattern drawing section 2. In this case, when the logic line width determination circuit 12 determines that the line width of the circuit pattern is neither 1 nor 2, the remaining logic line width of this circuit pattern is 3, so the control circuit 16 The control circuit 15 is controlled to turn on the AND circuit 17-1, and the input data is processed so that the circuit pattern is located at the center of the lattice, and this processed data causes the AND circuit 17-1 and the OR circuit 18 to It will be output via In this case, a circuit pattern having a width of W ₃ and a logic line width of 3 is drawn on the sub-lattice B of FIG. 1c.

The operation of the present invention will be explained based on the flowchart of FIG. 2 and with reference to FIGS. 1, 3, and other figures.

Although omitted in FIG. 1a, the present invention includes a data input section, a pre-processing section, a post-processing section, a pattern drawing section, etc.

(a) First, the control card on which programs and patterns are written is read from the data input section (not shown), and the size of the printed circuit board,
The circuit pattern creation area of the printed circuit board (there is a part of the printed circuit board where no circuit pattern is formed due to the insertion operation and the writing of the printed circuit board type name), the multilayer definition area, and the physical pitch between the main grids. , logical line widths 1 to 3 and their actual physical sizes, that is, physical line widths, etc. are input from the design standard database.

(b) Next, the preprocessing section calculates the magnification of the drawing output based on the paper size and the size of the printed circuit board, determines the writing start position, that is, the origin, and performs other processes such as determining the figure number.

(c) The data input section then reads circuit pattern data. This circuit pattern data is designed by a printed circuit board circuit pattern designer, and the circuit pattern data includes the positions of the start and end points of each circuit pattern on the printed circuit board, that is, the X and Y coordinates, and the circuit pattern's The information includes the size of the logic line width, etc., and the name of the circuit pattern designer is also input. At this time, if the circuit pattern has a continuous broken line shape, each straight line portion is treated as one circuit pattern.

(d) Based on the data such as the magnification calculated in step (b) above for the circuit pattern data input in step (c) above, the coordinate transformation of the circuit pattern data to be actually drawn on the recording paper is performed as shown in Figure 1a. This is performed by the pattern data coordinate exchange unit 1 in . However, the third
The control shown in the figure is not performed by this pattern data coordinate conversion section 1.

(e) The input data from the pattern data coordinate conversion section 1 is transmitted to the pattern shift section 3 of FIG. Creation control is performed. This drawing pattern creation control is sequentially performed for all circuit pattern data until it is completed.

(f) The pattern drawing section 2 in FIG.
Data that should be shifted by (e) is shifted, data that should be output as is is output as is, and data that is drawn at the center of the grid is processed so that the circuit pattern is located at the center of the grid. A pattern diagram is created using this data, and a printed circuit board pattern is drawn and outputted on recording paper based on the physical line width. This drawing is output for all the circuit patterns of the printed circuit boards input as the circuit pattern data input in (c) above. At this time, a post-processing section, which is not shown in FIG. 1A, creates and outputs a list showing the output results of the circuit patterns of each printed circuit board. This list indicates successful and unsuccessful drawing outputs for each printed circuit board number or drawing number, so the operator can distinguish between successful and unsuccessful drawing outputs by checking this list. can do. If the drawing is successful, the state of the circuit pattern on the printed circuit board can be accurately estimated by looking at the drawing.

〔Effect of the invention〕

According to the present invention, when drawing a circuit pattern according to the actual physical size and outputting it with a plotter device, if there is a high possibility that there will be contact in the drawing output even though there is no contact in the design, Since the circuit pattern is drawn with a slight shift, there is no chance of misunderstandings caused by contact.

As a result, the present invention makes it easier to see the pattern diagram.
It is possible to check the pattern wiring (width) at an early stage or to increase the efficiency of pattern diagram output.

[Brief explanation of the drawing]

FIG. 1a is a configuration diagram of an embodiment of the present invention, FIG. 1b is an example of a printed circuit board circuit pattern outputted by the present invention, and FIG. d is a detailed diagram of the pattern shift section, FIG. 2 is an explanatory diagram of the operation of the pattern drawing device of the present invention, FIG. 3 is an explanatory diagram of the pattern creation control state in the present invention, FIG. 4 is the plotter device, and FIG. An example of drawing using a conventional plotter device,
FIG. 6 is a diagram showing a conventional printed circuit board pattern drawing method. In the figure, 1 is a pattern data coordinate conversion section, 2 is a pattern drawing section, and 3 is a pattern shift section.

Claims (1)

[Claims] 1. It has a coordinate system defined by a main grid and a sub-grid, and based on this coordinate system, the land pattern position,
An apparatus for drawing a circuit pattern on a printed circuit board in which a line pattern running position is defined, comprising: a coordinate conversion means for converting a coordinate system of the printed circuit board into a drawing coordinate system; A pattern determining means for determining a plurality of line patterns, a line width determining means for determining the line width of the determined line pattern, and a pattern determining means for determining the line width of the determined line pattern; 1. A printed circuit board pattern drawing device, comprising: control means for shifting a drawing coordinate system of line patterns that are in contact by a predetermined amount in a direction in which the line patterns are separated from each other.