# US 2008/0186687 A1 · Printed circuit board

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- Number: US 2008/0186687 A1
- Document ID: US20080186687A1
- Status: Published application
- Kind: A1
- Application number: 11/765,453
- Filed: 2007-06-20
- Published: 2008-08-07
- Earliest claimed: 2007-02-07
- Assignees: Hon Hai Precision Industry Co., Ltd.
- Inventors: YU-HSU LIN; CHAN-FEI TAI; JENG-DA WU; CHIH-HANG CHAO
- Web page: https://patentgrep.com/patent/US20080186687A1

## CPC

- H05K 1/0248: {Skew reduction or using delay lines}
- H05K 1/025: {Impedance arrangements, e.g. impedance matching, reduction of parasitic impedance (H05K1/024 and H05K1/0243 take precedence; for semiconductor devices H10W44/20)}
- H05K 1/0366: {reinforced, e.g. by fibres, fabrics (H05K1/036 takes precedence)}
- H05K 2201/029: Woven fibrous reinforcement or textile
- H05K 2201/09227: Layout details of a plurality of traces, e.g. escape layout for Ball Grid Array [BGA] mounting
- H05K 2201/09281: Layout details of a single conductor
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

## Abstract

A printed circuit board includes a base formed from a plurality of woven fibers, and signal traces laid on the base. Each of the signal traces includes at least a straight line segment. The signal traces are laid on the base in such a manner that the line segments of the signal traces mapped on the base cross the fibers at angles not equal to zero degrees.

## Claims

### Claim 1

A printed circuit board, comprising:
a base formed from a plurality of woven fibers; and
signal traces laid on the base, each of the signal traces comprising at least a straight line segment, the signal traces laid on the base in such a manner that the line segments of the signal traces mapped on the base cross the fibers at angles not equal to zero degrees.

### Claim 2 (depends on 1)

The printed circuit board as described in claim 1, wherein the fibers comprise a set of parallel first fibers, and a set of parallel second fibers perpendicular to and interlaced with the set of first fibers.

### Claim 3 (depends on 2)

The printed circuit board as described in claim 2, wherein two adjacent first fibers and two adjacent second fibers define a rectangular area thereamong, the line segments of the signal traces mapped on the base cross diagonals of the rectangular area at angles not equal to zero degrees.

### Claim 4 (depends on 3)

The printed circuit board as described in claim 3, wherein a first angle is defined by the first fiber and the diagonal of the rectangular area, and a second angle is defined by the second fiber and the diagonal of the rectangular area, the angle defined by each line segment of each signal trace and each corresponding fiber the line segment crosses is not smaller than half of the smaller one of the first and second angles.

### Claim 5 (depends on 3)

The printed circuit board as described in claim 3, wherein a first angle is defined by the first fiber and the diagonal of the rectangular area, and a second angle is defined by the second fiber and the diagonal of the rectangular area, the angle defined by each straight line segment of each signal trace and one corresponding fiber it cross is equal to half of the smaller one of the first and second angles.

### Claim 6 (depends on 5)

The printed circuit board as described in claim 5, wherein the printed circuit board defines an X-axis along which the parallel first fibers extend, and a Y-axis perpendicular to the X-axis, and the straight line segments of the signal traces are arranged on the printed circuit board in a direction at an angle of α, 45+α, 90+α, or α−45 degrees relative to the X-axis of the printed circuit board, α is equal to half of the smaller one of the first and second angles.

### Claim 7

A printed circuit board, comprising:
a base formed from a plurality of woven fibers, the fibers comprising a set of parallel first fibers and a set of parallel second fibers perpendicular to and interlaced with the set of first fibers, two adjacent first fibers and two adjacent second fibers defining a rectangular area thereamong, a first angle defined by the first fiber and the diagonal of the rectangular area, and a second angle defined by the second fiber and the diagonal of the rectangular area; and
a set of parallel signal traces laid on the base, each of the signal traces comprising at least a straight line segment, the straight line segments of the parallel signal traces being designed to cross the first fibers at angles larger than zero and smaller than the first angle or cross the second fibers at angles larger than zero and smaller than the second angle.

### Claim 8 (depends on 7)

The printed circuit board as described in claim 7, wherein the angle defined by each line segment of each signal trace and one corresponding fiber the line segment cross is not smaller than half of the smaller one of the first and second angles.

### Claim 9 (depends on 7)

The printed circuit board as described in claim 7, wherein the angle defined by each line segment of each signal trace and each corresponding fiber it cross is equal to half of the smaller one of the first and second angles.

### Claim 10 (depends on 7)

The printed circuit board as described in claim 7, wherein the printed circuit board defines an X-axis extending in a horizontal direction, and a Y-axis perpendicular to the X-axis, and each line segment of the signal traces is arranged on the printed circuit board at an angle of α, α+45, α+90, or α−45 degrees relative to the X-axis of the printed circuit board, α is equal to half of the smaller one of the first and second angles.

### Claim 11

A method for producing a printed circuit board, comprising the steps of:
providing a large base, the base defining an X-axis and a Y-axis perpendicular to the X-axis, the base formed of a set of parallel first fibers extending in the X-axis direction and a set of parallel second fibers extending in the Y-axis direction, the first fibers and the second fibers interlaced with each other;
cutting the base into a sized base which has a size of the printed circuit board; and
laying signal traces each having at least one straight line segment on the sized base in such a manner that the line segments of the signal traces mapped on the base cross the fibers of the base at angles not equal to zero degree.

### Claim 12 (depends on 11)

The method as described in claim 11, wherein the sized base has a rectangular configuration, the base is cut in an abnormal manner such that two parallel edges of the sized base cross the X-axis direction of the base with an oblique angle, and the signal traces are laid on the sized base in a normal manner such that at least one of the straight line segments of the signal traces is coincident with the parallel edges of the sized base.

### Claim 13 (depends on 12)

The method as described in claim 12, wherein two adjacent first fibers and two adjacent second fibers define a rectangular area thereamong, a first angle is defined by the first fiber and the diagonal of the rectangular area, and a second angle is defined by the second fiber and the diagonal of the rectangular area, the oblique angle is equal to half of the smaller one of the first and second angles.

### Claim 14 (depends on 12)

The method as described in claim 12, wherein the sized base defines an X′-axis crossing the X-axis with the oblique angle, and the signal traces are laid such that the straight line segments of the signal traces are arranged on the sized base at angles of 0, 45, 90, or −45 degrees relative to the X′-axis of the sized base.

### Claim 15 (depends on 11)

The method as described in claim 11, wherein the sized base has a rectangular configuration, the base is cut in a normal manner such that two parallel edges of the sized bases are parallel to the first fibers and the other two parallel edges of the sized bases are parallel to the second fibers, and the signal traces are laid in an abnormal manner such that the line segments of the signal traces mapped on the base cross the fibers of the sized base at angles not equal to zero degrees.

### Claim 16

A printed circuit board, comprising:
a base comprising a plurality of parallel first fibers and parallel second fibers perpendicular to and interlaced with the first fibers, two adjacent first fibers and two adjacent second fibers defining a rectangular area thereamong; and
signal traces each comprising at least a straight line segment, the signal traces being laid on the base in such a manner that the straight line segments of the signal traces are not coincident with the fibers or the diagonals of the rectangular areas when mapped on the base.

### Claim 17 (depends on 16)

The printed circuit board as claimed in claim 16, wherein the printed circuit board defines an X-axis along which the parallel first fibers extend and a Y-axis along which the parallel second fibers extend, a first angle is defined by the first fiber and the diagonal of the rectangular area and a second angle is defined by the second fiber and the diagonal of the rectangular area, and the straight line segments of the signal traces are crossed at one point and arranged on the base with angles of α, 45+α, 90+α, or α−45 degrees relative to the X-axis, α being equal to half of the smaller one of the first and second angles.

### Claim 18 (depends on 16)

The printed circuit board as claimed in claim 16, wherein the printed circuit board defines an X-axis along which the first fibers extend and a Y-axis along which the second fibers extend, a first angle is defined by the first fiber and the diagonal of the rectangular area and a second angle is defined by the second fiber and the diagonal of the rectangular area, and the straight line segments of the signal traces are parallel to each other and arranged on the base with angles of α degrees relative to the X-axis, α being equal to half of the smaller one of the first and second angles.