JPH07283503A - Circuit board - Google Patents

Abstract

PURPOSE:To improve ability to measure connection resistance between connecting parts of a circuit board and check a misregistration in circuit board connection, and to prevent disconnection of a circuit connection terminal. CONSTITUTION:Connection resistance between a connection terminal 1bbb and a connection terminal 2bb is measured using measurement terminals 1bba and 2ba. A misregistration between boards changes the connection area of the connection terminals 1bbb and 2bb, thus changing the connection resistance value. By measuring the resistance value using the measurement terminals 1bba and 2ba, it is possible to detect generation of a misregistration between a flexible board l and a printed board 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiring pattern of a circuit board for electrical connection.

[0002]

2. Description of the Related Art Conventionally, a wiring pattern 1b is formed on a circuit board 1 as shown in FIGS. The wiring pattern 1b is provided with a connection terminal 1baa for connection to another board, and is covered with an insulating material 1c such as polyimide except for a portion connected to another circuit board. Similarly, the circuit board 2 is formed with a wiring pattern 2b and a connection terminal 2ba for connecting to another board, and is covered with an insulating material 2c except for a portion connected to the other circuit board. It has been known that the circuit board 1 and the circuit board 2 are connected by connecting the connection terminals 1ab and 2ab.

[0003]

However, the conventional circuit board has the following problems. In the structures shown in FIGS. 13 and 14, the connection portion of the connection terminal 1aa and the connection terminal 2aa forms a circuit with the wiring pattern 1a and the wiring pattern 2a, so that it is difficult to measure the connection resistance of the connection portion. The inspection of the positional deviation of the circuit board requires visual inspection because the connection resistance value cannot be obtained, and the inspection is troublesome. In the structure shown in FIG. 13, when the circuit board is about to come off, the wiring patterns 1bbb, 2ba of the circuit board may cause disconnection of the connection terminal.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above problems of the prior art, to enable the measurement of the connection resistance of the connection portion, to improve the positional deviation inspection property of the circuit board connection, and to connect the circuit connection. It is to prevent disconnection of terminals.

[0005]

In order to solve the above-mentioned problems, the present invention provides a circuit board having two or more terminals which are electrically connected to each other and which are electrically connected via at least one connection terminal. The wiring pattern has such a structure.

The wiring pattern from the externally electrically contactable terminal to the connection terminal is electrically independent of other wiring patterns. The connection terminal, which is electrically connected to the terminal that can be electrically contacted from the outside, has a wiring pattern located at the end of the side to which the circuit board is connected.

[0007] Then, connecting terminals electrically connected to one and the same electrically connecting terminals of one circuit board are electrically independent of two or more externally electrically connectable terminals and other wiring patterns. The structure has a wiring pattern.

[0008]

In the circuit board constructed as described above,
By connecting the circuit boards to each other, which can be electrically contacted from the outside by conducting at least one connecting terminal.
Has one or more terminals. The resistance value of the connection portion can be easily measured by using the above-mentioned electrically contactable terminal.

Further, if the wiring pattern from the externally electrically connectable terminal to the connection terminal is electrically independent of other wiring patterns, only the connection resistance value of the connection terminal can be measured. it can. In addition, since the connection terminal that is electrically connected to the terminal that can be electrically contacted from the outside has the wiring pattern located at the end of the side where the circuit board is connected, the wiring pattern reinforces the connection strength of other wiring patterns. .

Further, the electrically identical connection terminals of one circuit board are electrically connected with the connection terminals electrically independent of the other wiring patterns which are electrically connected to the two or more externally electrically connectable terminals. By having the wiring pattern, the connection resistance of the connection portion can be measured.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 2 is a top view in which a flexible board having a wiring pattern according to the present invention and a printed circuit board are connected, and FIG. 1 is a sectional view taken along the line AA 'in FIG. In the figure, 1 is a flexible substrate, 1a is a base of the flexible substrate, 1b is a copper foil wiring pattern formed on the base 1a, 1ba is a wiring pattern for forming a circuit after connection, 1bb is electrically independent of the wiring pattern. The wiring pattern, 1bba is a measurement terminal that can be electrically contacted from the outside, 1baa and 1bbb are connection terminals, 1c is a coverlay, 2 is a printed circuit board, 2a is a base such as ceramic,
2b is an aluminum wiring pattern film-formed on the base 2a, 2ba is a measurement terminal which can be electrically contacted from the outside, 2b
Reference numeral b is a connection terminal of the circuit board, 2c is an insulating film, and 3 is an anisotropic conductive film.

The flexible substrate 1 has a wiring pattern 1ba.
And wiring pattern 1bb, and wiring patterns 1ba and 1ba
bb is electrically independent, the wiring pattern 1ba has a connection terminal 1baa, and the wiring pattern 1bb is a measurement terminal 1bb.
It has a and a connection terminal 1bbb. Wiring pattern 2b
Is formed on the printed circuit board 2 and has a measuring terminal 2ba and a connecting terminal 2bb. Connection terminal 2 of printed circuit board 2
bb is the flexible substrate 1 using the anisotropic conductive film 3.
Connected to the connection terminals 1bba and 1bbb.

With this configuration, the connection resistance of the connection terminal 1bbb and the connection terminal 2bb can be easily obtained by using the measurement terminals 1bba and 2ba, so that the connection state of the circuit board can be managed by the connection resistance. Next, the effect of this embodiment with this configuration will be described.

3 and 4 show the case where the connecting positions of the connecting terminals are displaced. FIG. 3 shows a case where the connecting position of the connection terminals is displaced in the horizontal direction, FIG. 4 shows a case where the aligning position is displaced in the vertical direction, and FIG. 5 shows a case where the aligning position is displaced obliquely. If the alignment position shifts, the connection terminals 1bbb and 2bb
The connection resistance value changes because the connection area changes. Therefore, by measuring the resistance value using the measurement terminal 1bba and the measurement terminal 2ba, it is possible to know the occurrence of misalignment between the flexible board 1 and the printed board 2.

(Embodiment 2) FIG. 6 shows another embodiment of FIG.
6 is a cross-sectional view taken along the line AA ′ in FIG. 6, and FIG. 8 is an enlarged view of a B portion in FIG. In the figure, 1 is a flexible substrate,
1a is a base of a flexible substrate, 1b is a copper foil wiring pattern formed on the base 1a, 1ba is a wiring pattern for forming a circuit after connection, 1bb is a wiring pattern electrically independent of the wiring pattern, and 1bba is from the outside. Electrically contactable measurement terminals, 1baa and 1bbb are connection terminals, 1c is a coverlay, 2 is a printed circuit board, 2a is a base such as ceramic, 2b is an aluminum wiring pattern filmed on the base 2a, and 2bb is a connection terminal. 2c is an insulating film and 3 is an anisotropic conductive film.

In this embodiment, the wiring pattern 1bb electrically independent from the wiring pattern 1ba is the flexible substrate 1
The connection terminals 1bbb and 2bb are arranged at both ends thereof so that a normal alignment position is obtained, and the connection positions of the connection terminals at both ends are line symmetrical. The measurement terminal 2ba formed on the wiring pattern 2b of the printed circuit board in the first embodiment is eliminated. The other points are the same as those in the first embodiment described above.

With this configuration, the sum of the connection resistances at both ends of the flexible substrate 1 can be measured by using the measuring terminals 1bba at both ends of the flexible substrate 1. Next, the effect of this embodiment with this configuration will be described.

Since the measured connection resistance value is the sum of the connection resistances at both ends of the flexible substrate 1, even if the flexible substrate 1 is stretched when the substrates are connected by thermocompression bonding, the connection resistance values at both ends are used to match the substrates. It is possible to manage misalignment. FIG. 8 shows a state where the circuit board alignment position is normal, and FIG. 9 shows a state where the circuit board alignment position is displaced.

On the other hand, since abnormalities such as peeling at the connecting portion between the flexible substrate 1 and the printed circuit board 2 occur from both ends,
The connection terminals 1bbb arranged at both ends of the substrate have an effect of reinforcing the connection between the adjacent connection terminals 1baa and 2bb. (Embodiment 3) FIG. 10 shows another embodiment, and FIG.
12 is a cross-sectional view taken along line AA ′ in FIG. 12, and FIG. 12 is an enlarged view of portion B in FIG. 10. In the figure, 1 is a flexible substrate, 1
a is a base of a flexible substrate, 1b is a copper foil wiring pattern formed on the base 1a, 1ba is a wiring pattern for forming a circuit after connection, 1bb and 1bc are wiring patterns electrically independent of the wiring pattern, and 1bba. 1 bc
a is a measurement terminal that can be electrically contacted from the outside, 1 baa, 1
bbb and 1bcb are connection terminals, 1c is a cover lay, 2 is a printed circuit board, 2a is a base such as ceramic, 2b is an aluminum wiring pattern filmed on the base 2a, 2bb
Is a connection terminal, 2c is an insulating film, and 3 is an anisotropic conductive film.

In the present embodiment, the wiring patterns 1bb and 1bc, which are electrically independent of the wiring pattern 1ba, are adjacent to each other at both ends of the flexible substrate 1 and have the connection terminals 1bbb and 2b.
The horizontal ends of bb are the same, and the connection terminal 1bca has a distance greater than the width of the connection terminal 1bbb between the horizontal ends of the connection terminals 2bb and 1bca on the opposite side to which the connection terminal 1bbb is connected. The connection terminals 2bb are arranged so that they are connected to each other at a normal alignment position, and the alignment positions of both ends of the circuit board are line-symmetric. The other points are the same as those in the second embodiment described above.

With this structure, the connection terminals at both ends can be individually measured by using the measuring terminals 1bba and 1bca provided at each end of the flexible substrate 1. Next,
The effect of this embodiment with this configuration will be described. Since the measured connection resistance value is the connection resistance at each end of the flexible board 1, as shown in FIG. 13, the board alignment position is laterally displaced and one connection terminal 1bbb is connected to the connection terminal 2b.
Since the other connection terminal 1bbb is connected even when it is deviated from b, the connection resistance at one end can be measured. From this, when one of the connection resistances cannot be measured, the shift direction of the circuit board alignment position can be easily known by knowing the unmeasurable end.

[0022]

As described above, according to the present invention, in a circuit board, there are two or more terminals that are electrically connected to each other from the outside and are electrically connected via at least one connection terminal. The pattern, the wiring pattern from the outside to the electrically contactable terminal and the connection terminal are electrically independent from other wiring patterns, and the connection terminal that is electrically connected to the externally contactable terminal A wiring pattern located at an end of a side to which the circuit board is connected, and a wiring pattern for connecting a connection terminal electrically connected to two or more externally contactable terminals to an electrically identical connection terminal, Since it is configured to have, it has an effect to be described. Since the connection resistance value can be measured, the connection status can be managed. Since the deviation of the connection position can be known depending on the magnitude of the connection resistance value, quality control is facilitated. From the measurement results of the connection resistance at the two locations, it is possible to know whether the displacement of the connection position is in the direction, which facilitates the quality control. Since the connection terminal is provided at the end of the wiring pattern, there is little risk of disconnection of the connection portion due to peeling of the circuit board. Since there is a terminal that enables electrical contact from the outside, measurement becomes easy.

[Brief description of drawings]

FIG. 1 is a circuit board connection portion (AA ′) according to a first embodiment of the present invention.
FIG.

FIG. 2 is a circuit board connection state diagram of the first embodiment of the present invention.

FIG. 3 is a diagram showing lateral displacement of the alignment position of the circuit board according to the first embodiment of the present invention.

FIG. 4 is a diagram of vertical displacement of the alignment position of the circuit board according to the first embodiment of the present invention.

FIG. 5 is a diagram showing an oblique displacement of the alignment position of the circuit board according to the second embodiment of the present invention.

FIG. 6 is a circuit board connection state diagram of a second embodiment of the present invention.

FIG. 7 is a circuit board connecting portion (AA ′) according to the second embodiment of the present invention.
FIG.

FIG. 8 is an enlarged view (normal) of the connection terminal according to the second embodiment of the present invention.

FIG. 9 is an enlarged view (abnormality) of the connection terminal according to the second embodiment of the present invention.

FIG. 10 is a circuit board connection state diagram of a third embodiment of the present invention.

FIG. 11 is a circuit board connection portion (A-) according to the third embodiment of the present invention.
It is a figure of A'section.

FIG. 12 is an enlarged view of a connection terminal according to a third embodiment of the present invention (normal).
Is.

FIG. 13 is an enlarged view of a connection terminal of Example 3 of the present invention (abnormal).
Is.

FIG. 14 is a conventional circuit board connection state diagram.

FIG. 15 is a view of a conventional circuit board connecting portion (AA 'cross section).

[Explanation of symbols]

 1 flexible substrate 1a base 1b outer foil wiring pattern 1ba wiring pattern 1baa connection terminal 1bb wiring pattern 1bba measurement terminal 1bbb connection terminal 1bc wiring pattern 1bca measurement terminal 1bcb connection terminal 1c coverlay 2 printed circuit board 2a ceramic wiring base 2b aluminum wiring pattern 2a Measuring terminal 2bb Connection terminal 2c Insulating film 3 Anisotropic conductive film

Front page continued (72) Inventor Tokaibayashi Hogori 63-11-1 Kameido, Koto-ku, Tokyo Seiko Electronics Inc. (72) Inventor Yoshinori Sato 6-31-1 Kameido, Koto-ku, Tokyo Seiko Electronic Industry Co., Ltd. (72) Inventor Yuichi Ishida 6-31-1, Kameido, Koto-ku, Tokyo Seiko Electronic Industry Co., Ltd.

Claims (4)

[Claims] 1. A circuit board in which two or more circuit boards are electrically connected to each other, the wiring having two or more terminals which are electrically contactable from the outside and which conducts via at least one connection terminal. A circuit board having a pattern. 2. In a circuit board in which two or more circuit boards are electrically connected, a wiring pattern from an externally electrically contactable terminal to a connection terminal is electrically independent from other wiring patterns. The circuit board according to claim 1, wherein: 3. A circuit board in which two or more circuit boards are electrically connected has a wiring pattern in which a connection terminal electrically connected to a terminal that can be electrically contacted from the outside is located at an end of a side to which the circuit board is connected. The circuit board according to claim 1, wherein: 4. A circuit board in which two or more circuit boards are electrically connected to each other so that electrically connected connection terminals of one circuit board are electrically connected to two or more terminals that can be electrically contacted from the outside. The circuit board according to claim 2, further comprising a wiring pattern for connecting the terminals.