JPH0253822B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a printed board (hereinafter referred to as this) for designing a printed board pattern for an analog circuit.
This paper relates to a method for correcting curved patterns in CAD equipment (abbreviated as PCB).

(Prior Art) The signals handled by analog circuit printed boards are analog signals, and waveform changes such as absolute values of voltage and current and changes over time are important. For this reason, when designing the printed circuit board pattern for analog circuits, it is necessary to keep the signal lines as short as possible, and it is also necessary to increase the pattern width depending on the magnitude of the current. . It is also necessary to modify the curved pattern once drawn while maintaining smooth connections.

Conventional PCB/CAD equipment is designed for pattern design of digital printed boards. Digital printed boards handle information such as "1" and "0", and signal lines can be routed relatively freely, and patterns are mainly written using straight lines and broken lines.

For this reason, there is little need to correct a curved pattern once drawn, and therefore, correction of a curved pattern has been carried out by repeating simple corrections of a straight line pattern.

(Object of the Invention) Here, the present invention aims to provide a method for correcting a curved pattern in a PCB/CAD device, which allows a pattern written in a curved line to be corrected and moved with a simple operation.

(Structure of the Invention) The method of the present invention to achieve the above object includes a computer for designing a pattern, a storage means for storing input data and various data calculated by the computer, and a computer for designing a pattern. A keyboard for inputting necessary information into the computer, a CRT for displaying various information on the screen, and this
A printed board equipped with an input means for inputting information by moving a cursor to any position on a CRT screen
In the CAD device, the computer extends a straight line on the curve in the curve pattern displayed on the CRT screen to create a broken line, and when an arc-shaped portion on the curve pattern is picked by the input means, The break point corresponding to the circular arc portion is moved by an amount d corresponding to the amount specified by the input means, and each of the other break points is also moved by the distance d between the end of the curve pattern and the picked point. The distance L and the distance L between the end and the corresponding corner point are respectively moved by an amount K·d multiplied by a value K obtained by performing a predetermined calculation using When a straight line section is picked, the break points at both ends of the straight line section are moved by an amount d corresponding to the amount specified by the input means, and each of the other break points is also moved by an amount d corresponding to the amount of movement d. Each of the broken lines is moved by an amount K・d multiplied by the value K obtained by performing a predetermined calculation, and each broken point of the broken line obtained by moving each bending point is changed into an arc shape and displayed on the CRT screen. This method is characterized by correcting the curve pattern that has been created.

(Example) FIG. 1 shows the method according to the present invention being carried out.
FIG. 2 is a block diagram of the configuration of a PCB/CAD device. In the figure, numeral 1 is a computer, which controls various parts to operate as a CAD device. Then, according to the input program,
It also performs calculations for correcting curve patterns, which will be described below. A disk 2 stores input data and various data calculated by the computer 1. Reference numeral 3 denotes a keyboard, which inputs information regarding printed boards and the like designed by the CAD device into the computer 1. 4 is a tablet, CRT
5 on a flat plate in one-to-one correspondence with the screen position 5, and input data such as lines into the computer 1 by pointing with the tip of a pen (not shown). CRT5 displays various information on the screen, usually in an interactive format.
Design patterns for printed boards. Reference numeral 6 denotes a plotter, which draws the designed wiring pattern etc. on actual paper based on the drawing data calculated by the computer 1. 7 is the bus line, computer 1
and each part are connected to each other, and signals are exchanged with the computer 1.

In the apparatus configured as described above, the operation for designing the pattern of the analog circuit printed board is carried out as follows.

First, the operator performs an operation to place the components of the analog circuit for which the wiring pattern is to be designed in the wiring area of the printed board displayed on the screen of the CRT 5. At this time, parts information (for example,
The distance between the mounting feet for each electronic component, etc.) is as follows:
Normally, it is stored in advance on the disk 2 of the CAD device, but the operator can input it via the keyboard 3.
The type of electronic component to be mounted is inputted, and the mounting position of the electronic component on the printed board is inputted to the computer 1 via the tablet 4. In this way, when the input of information regarding all the parts is completed, the computer 1 knows the mounting positions of the electronic parts constituting the printed board.

Next, when the positions of all the mounting parts are determined, the operator inputs the connection information between each mounting pin using the tablet 4 while looking at the screen of the CRT 5. This input is typically used for tablet 4
While pointing the upper position with a special pen, a cursor is displayed on the CRT screen corresponding to the position of the pen tip on the tablet 4, and connection information between each pin is input using this cursor. This creates a smooth curved pattern connecting each connection point.

Next, the curve pattern correction method of the present invention will be explained with reference to FIGS. 2 to 4.

2 and 4 are diagrams showing curve patterns displayed on the screen of the CRT 5, and FIG. 3 is a flowchart showing an example of the operation performed by the computer 1. Modification of the curve pattern shown in FIG. 2 involves picking a portion of a long curve and moving it by a desired amount d with the pen of tablet 4. First, a case will be described in which a point P on an arc-shaped portion on a curved pattern is picked.

In this case, the computer 1 first stores data of a curve pattern to be corrected (this curve is written as a combination of straight lines and circular arcs, and these are called entities) (step 1). Next, the correction amount (movement amount d) input using the pen on the tablet 4 is input (step 2). Next, it is determined whether the pattern curve should be corrected (step 3). In this case, the answer is "yes" and the process moves to step 4. Step 4
Now, we will perform a curve-broken line conversion that extends the straight line portions on the curves in the curve pattern to create broken lines. Subsequently, the amount of correction of the break point in the obtained broken line is calculated (step 5). In this calculation, in the case of the pattern shown in Figure 2, the amount of movement of point P is the specified amount d, and the amounts of movement dQ and dR of other corner points Q and R are calculated by the following formula. .

dQ=d・l ₁ /L ₁・α ₁ …(1) dR=d・l ₂ /L ₂・α ₂ …(2) However, L ₁ and L ₂ are the picked point P and the edge of the curved pattern The distance between the parts O ₁ and O ₂ , l ₁ and l ₂ are the distances from the ends O ₁ and
The distance between Q ₂ and the corner points Q and R, α ₁ .α _{2 ,} is a coefficient of 1 or less, for example, 0.5.

Next, the broken line is corrected based on the amount of movement obtained in step 5 (step 6). Next, it is determined whether the pattern to be corrected is a curve (step 7). In this case, the answer is "yes" and the polygonal line is converted to a curve in step 8. That is, each break point portion P ₁ of the broken line obtained by moving each break point,
Change Q ₁ and R ₁ to arc shapes. Note that the method of converting this corner portion into a circular arc shape may be used, for example, as proposed in Japanese Patent Application No. 1987-48791.

Subsequently, each curve pattern is corrected to the changed data (step 9), the corrected curve pattern is displayed on the CRT 5 (step 10), and the process ends.

Next, a case will be described in which a straight line point S point on a curved pattern is picked. FIG. 4 is an explanatory diagram in this case. In this case, in step 5, the moving amounts dT and dU of the corner points T and U, which are at both ends of the picked point S, are set to the specified amount d, and the line segment
Translate TU. In Figure 4, the break points are T,
In the example of two points of U, if there is another breaking point, the amount of movement of the remaining breaking point can be calculated according to equations (1) and (2).

FIG. 5 is a diagram showing an example of curve pattern correction by the method of the present invention. A is the pattern before correction, and by picking each point indicated by P to U as shown by the arrow, the pattern is corrected and moved in a short time to a smooth curved pattern as shown in b. be able to.

(Effects of the Invention) As described above, according to the present invention, a pattern drawn by a curved line can be modified and moved with simple operations and without performing complicated calculations. The method of the present invention is practical when applied to PCB/CAD equipment that designs patterns for analog circuit printed boards.

[Brief explanation of the drawing]

Figure 1 shows a PCB on which the method of the present invention is implemented.
The configuration block diagram of the CAD device, Figures 2 and 4 are diagrams showing curved patterns displayed on the CRT screen,
FIG. 3 is a flowchart of the operation performed by the computer in the apparatus shown in FIG. 1, and FIG. 5 is a diagram showing an example of correcting a curve pattern by the method of the present invention. 1...computer, 2...disk, 3...
keyboard, 4...tablet, 5...CRT,
6... Protsuta.

Claims (1)

[Claims] 1. A computer for designing a pattern, a storage means for storing input data and various data calculated by the computer, and a keyboard for inputting information necessary for designing a pattern into the computer. , a CRT that displays various information on the screen,
In this printed board CAD device equipped with an input means for inputting information by moving a cursor to an arbitrary position on the CRT screen, the computer is configured to calculate a straight line portion on a curved line in a curved pattern displayed on the CRT screen. When an arc-shaped portion on the curve pattern is extended and a broken line is created and the input means is used to bit the arc-shaped portion on the curved line, the break point corresponding to the arc portion is changed by an amount d corresponding to the amount specified by the input means. At the same time, each other corner point is also subjected to a predetermined calculation using the amount of movement d, the distance L between the end of the curve pattern and the picked point, and the distance l between the end and the corresponding corner point. When a straight line portion on the curved pattern is picked by the input means, the break points at both ends of the straight line portion are moved by the amount specified by the input means. While moving the amount d, each of the other break points is also moved by the value obtained by performing the above-mentioned predetermined calculation on the movement amount d, and then each break point is moved to determine the break point of the broken line. A method for correcting a curved pattern, comprising changing each portion into an arc shape to correct the curved pattern displayed on the CRT screen.