JPH01206693A - Wiring of printed board - Google Patents

Abstract

PURPOSE:To enable required wirings even if channels differ remarkably from each other in a wiring density by a method wherein channels are varied in width and a wiring density inside a channel is partially changed. CONSTITUTION:Channels 1, 2, 3... are changed in width, the number of tracks of each channel is set on a table, and the number of useful empty tracks of each channel is also set on the table, whereby it is judged if the wiring is possible or not for a channel. And, when a wiring is done for a channel, the number of the empty tracks of the channel is subtracted by one, whereby a wiring channel density inside the channels is partially changed to enable an automatic wiring. As mentioned above, even if the channels differ remarkably from each other in a wiring density, a required automatic wiring can be performed by varying the width of the channel which compose a wiring region of a wiring board. By these processes, an automatic wiring of a high density printed board that surface mounting components such as a chip component, a flat pack, a mini flat pack, and others are mounted can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a printed board wiring method applied to automatic channel wiring of double-sided printed boards, multilayer printed boards, and the like.

(Prior Art) FIG. 5 is a diagram for explaining a conventional automatic channel wiring method for a double-sided printed board 51. In the conventional channel automatic wiring method, the front surface (back surface) of the double-sided cylinder plate 51 is divided horizontally (vertically) into a plurality of 6 elongated strip-shaped channels 1 to 5 to form wiring regions, and these channels are 1 to 5 are automatically wired. For example, when connecting point A and point B in Fig. 5,
Point A and point 0 are connected via a horizontal channel 5, and point 0 and D are connected via a through hole connecting the front surface and the back surface and a vertical channel 4. The connection line is then led out to the front surface again through the through hole at point D, and the connection between point D and point B is made through the horizontal channel 1. In the conventional channel automatic routing method described above, channels to be passed are determined in advance, and detailed tracks 5 within these channels are
2 will be decided later.

Further, the widths of each of these channels 1 to 50 were determined to be the same width, for example, 0.1 inch (2,54111711), which is the interval between IC (integrated circuit) bins.

As mentioned above, by determining the width of each channel 1 to 5 to be the same width, for example, there is an advantage that the number of empty tracks 52 in each channel 1 to 5 can be easily managed. For example, when it is necessary to locally significantly change the wiring density for each channel, there are problems such as a significant drop in wiring efficiency.

(Problem to be Solved by the Invention) FIG. 6 is a partial front view showing an example of 111WB61 to be automatically wired. As shown in the figure, a plurality of pins 63 are arranged at a pitch interval of 0.1 inch. Ru. In Fig. 6, three wiring patterns 6 are arranged at a pitch of 0.1 inch.
2, the wiring area is divided into a plurality of channels having an equal width of 0.1 inch as shown in FIG. Can be wired in any way. However, as shown in FIG. 8, which shows an enlarged view of one of the channels, a wiring prohibition zone such as a smaller obstacle 81 is arranged in channel N. Sometimes there are. In such a case, the routeable area of the channel is divided into upper and lower parts of the prohibited wiring zone, respectively, as shown by patterns 82 and 83 routed on the track, so that the empty track of channel N is It cannot be expressed as a capacitance, so automatic wiring cannot be done as is.

As described above, when there is a wiring prohibition zone within a channel, in order to enable channel automatic routing, it is necessary to represent the channel as a channel with different track capacities above and below the wiring prohibition zone, for example.

However, as mentioned above, in the conventional channel automatic wiring method, the width of each channel is determined to be the same width, so there are cases where a wiring prohibited zone is provided within the channel, or wiring within each channel is set to the same width. If the density changes significantly, there are drawbacks such as the inability to achieve channel automatic wiring.

In addition, especially as high-density mounting on printed circuit boards progresses and many chip parts and chips are used,
If all channels are set to have the same width, for example, 0.1 inch, problems will arise, such as the inability to model them.

An object of the present invention is to solve the above-mentioned conventional problems, and to maintain the advantages of conventional channel wiring, while also making it possible to conduct desired wiring even when the wiring density of each channel changes significantly. The goal is to provide the following.

[Structure of the invention]

(Means for Solving the Problems) A printed board wiring method according to the present invention is a printed board wiring method in which a board surface of a printed board is divided into a plurality of channels to form a wiring area, and wiring is routed through the channels. The method is characterized in that the width of the channel is changed and the wiring density within the channel is partially changed.

(Function) According to the present invention, in a channel wiring method for a printed board, each channel has a different width, or even within the same channel, the width can be changed depending on the location. By changing the wiring track capacitance, wiring can be performed by partially changing the wiring density within the channel. As a result, automatic wiring can be efficiently performed even for models in which the wiring track capacity differs for each channel and for different locations within the same channel.

(Embodiment) FIG. 1 is a diagram for explaining a printed board wiring method according to an embodiment of the present invention, in which 100 indicates a printed board, and a plurality of channels 1 formed on the board surface of this printed board 100 are shown. ~
4, each channel has the same width (number of tracks) in the horizontal direction, but each channel is formed to have a different width.

FIG. 2 is a diagram for explaining another embodiment of the present invention.
00 indicates a printed board, and the plurality of channels 1 to 4 formed on the board surface of this printed board 200 not only have different widths among the channels, but also have different widths in the horizontal direction. It is formed like this.

For example, if you perform channel division as shown in Figure 2,
The track capacity of each channel at horizontal positions (1) to (2) can be represented by a matrix as shown in FIG. In FIG. 3, the vertical axis represents the channel number, and the horizontal axis represents the horizontal wiring passing points.

Furthermore, the numbers within each frame indicate the number of trunks that can be wired at that point. In the channel automatic wiring program, if the number in the box above is greater than 1, it is determined that wiring is possible, and the wiring is performed using that route, and when this wiring is completed, 1 is subtracted from the number above. It will decrease. When the number becomes 0 in this way, it is determined that no wiring can be routed through that channel anymore.

After assigning the channels using automatic wiring as described above,
The track assignment step determines fixed tracks for the wiring within each channel. In this track assignment step, as shown in Figure 4, the wiring within each channel is first assigned to a logical track.
After that, those channels and logical tracks are converted into physical tracks, and the track assignment at step b92 is performed.

According to the present invention, as shown in FIG. 1 or 2, the width of each channel is changed, the number of tracks for each channel is set in a table, and the number of effective empty tracks in each channel is set in a table. In particular, determine whether each channel can be wired and, if wired,
By reducing the number of empty trunks in that channel by one, automatic wiring can be performed by partially changing the wiring density within each channel.

〔Effect of the invention〕

According to the present invention, desired automatic wiring can be performed even when the wiring density of each channel changes significantly by changing the width of the channels forming the wiring area of the printed board. This also enables automatic wiring of high-density printed circuit boards on which surface-mounted components such as chip components, flat packs, and mini-flat packs are mounted.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing channels of a printed board according to one embodiment used to carry out the method of the present invention, and FIG. 2 is a diagram showing channels of a printed board according to another embodiment used to carry out the method of the present invention. FIG. 3 is a diagram showing the track capacity in FIG. 2, FIG. 4 is a flowchart of an embodiment of the method of the present invention, and FIGS. 5 to 8 respectively explain conventional channel automatic wiring. This is a diagram for 100.200...Printed board.゛Applicant's representative Patent attorney Takehiko Suzue + 1 pitcher, C%4(y)gu...+Measurement) 1 N size 1. . Kiy worldly, -(N (Y) gu... Ki? Ordinance?

Claims (1)

[Claims] In a printed board wiring method in which a board surface of a printed board is divided into a plurality of channels to form a wiring area, and wiring is routed through the channels, the width of the channel is changed to partially increase the wiring density within the channel. A printed circuit board wiring method characterized by changing the wiring.