JPH08148789A - Printed board - Google Patents

Abstract

PURPOSE: To reduce the wear of the connector electrode of a connector for a board by disposing a member having smaller wear than that of a printed board between a connecting terminal and a board end. CONSTITUTION: A member having smaller wear than the surface of a printed board such as a dummy pattern 6 not connected to a connecting terminal 5b is formed between the terminal 5b, which is formed with a pattern to the position isolated at a predetermined interval from a board end 4, and the board end 4. Similarly, a dummy pattern 7 which is not connected to a connecting terminal 5C is formed between a connecting terminal 5C and the board end 4. A connector electrode 12 and the pattern 7 are slid in the state stat the electrode 12 presses the pattern 7, then the electrode 12 presses the pattern of the terminal 5C, thereby becoming a conductive state. Thus, even if a printed board 1a is repeatedly inserted into or removed from the connector 10, the board surface and the electrode 12 are not slit, but the wear of gold plating of the electrode 12 can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed circuit board which is inserted into a board connector for use.

[0002]

2. Description of the Related Art Conventionally, there has been known an electronic device configured by connecting a plurality of printed boards on which electric parts are mounted and an electric circuit is formed using a board connector (for example, a card edge connector). The plurality of printed circuit boards connected in this way are configured as shown in FIG. 3, for example.

In FIG. 3, reference numeral 1 is a printed circuit board.
The printed circuit board 1 is composed of a circuit section 2 on which electric parts are mounted to form an electric circuit, and a connection terminal section 3 for connecting to an external electric circuit.

The connection terminal portion 3 is a connection in which a wiring conductor (hereinafter referred to as a "pattern") is formed from the circuit portion 2 of the printed board 1 to a position substantially matching the board plate edge 4 in the direction of the board plate edge 4. The terminal 5a is composed of a connection terminal 5b having a pattern formed up to a predetermined distance from the substrate plate edge 4, and a connection terminal 5c having a pattern formed up to a wider distance.

Since the connection terminals are formed in different patterns in this way, for example, the connection terminal 5a is a ground terminal,
When the connection terminal 5b is a power supply terminal and the connection terminal 5c is a signal line terminal, the ground terminal of the connection terminal 5a is the board connector 10 when the printed circuit board 1 is inserted into the board connector 10 described later. After being connected to the connector electrode, the power supply terminal of the connection terminal 5b is connected to the connector electrode, and then the signal line terminal of the connection terminal 5c is connected to the connector electrode. Therefore, even when power is supplied to the board connector 10, the printed board 1 can be attached to the board connector 10 without causing a malfunction.

The connection terminals 5a, 5b and 5c are plated with gold in order to reduce the contact resistance with the connector electrode 12 of the board connector 10 and to prevent the connection terminals 5a, 5b and 5c from being oxidized.

The printed circuit board 1 is inserted into a board connector 10 as shown in FIG. 4 and connected to another electric circuit.

In FIG. 4, reference numeral 1 is a printed circuit board.
Reference numeral 0 is a board connector. The board connector 10 includes
A board insertion opening 11 for inserting the printed board 1 is formed, and inside the board insertion opening 11, connector electrodes 12 are arranged at intervals equal to the intervals of the connection terminals of the printed board 1. Further, one of the connector electrodes 12 is shaped to hold the connection terminals 5a and 5b of the printed board 1 when the printed board 1 is inserted from the board insertion port 11, and the other is connected to the connection terminal of the board connector 10. Then, for example, the printed circuit board 20 is soldered. Similar to the connection terminals 5a and 5b of the printed circuit board 1, the connector electrode 12 is also gold-plated to reduce the contact resistance and prevent oxidation of the contact surface.

[0009]

By the way, when the printed board 1 is inserted into the board connector 10, as shown in FIG.
As shown in FIG. 5B, the connector electrode 12 of the board connector 10 is slid in a state of pressing the board surface of the printed board 1, and then the pattern of the connection terminal 5b is changed to the connector electrode 12 as shown in FIG. 5B. It is in a pressed state and is electrically connected.

For this reason, when the printed circuit board 1 is repeatedly inserted into and removed from the substrate connector 10, the gold plating of the connector electrode 12 is worn by the substrate surface of the printed circuit board 1 and the contact failure between the pattern of the connector electrode 12 and the connection terminal 5b, etc. May occur, and the connecting terminal 5c may also
As in the case of b, there was a risk of poor contact. In this case, when the printed board 1 is a glass-based epoxy resin board, the board is harder than a paper-based phenol resin board or the like, so that the wear of the gold plating of the connector electrode 12 is remarkable.

Therefore, the present invention provides a printed circuit board which can reduce the wear of the connector electrodes of the board connector.

[0012]

A printed circuit board according to a first aspect of the present invention is a printed circuit board which is used by being inserted into a connector for a circuit board, the position being a predetermined distance from a board plate end of the printed circuit board. A connection terminal for connecting to the board connector on which the conductor is formed is provided, and a member having less friction than the board surface of the printed board is arranged between the connection terminal and the board end.

According to a second aspect of the present invention, in the printed circuit board of the first aspect, the member is a conductor that is not connected to the connection terminal.

[0014]

According to the first aspect of the invention, the board surface of the printed board is between the board terminal and the connection terminal with the board connector on which the conductor is formed up to a position separated from the board edge of the printed board by a predetermined distance. A member having less friction is arranged. Therefore, even if the printed circuit board is repeatedly inserted into and removed from the circuit board connector, this member and the connector electrode slide, so that abrasion of the connector electrode such as gold plating due to sliding of the printed circuit board surface and the connector electrode is reduced. It is possible to obtain a stable contact state between the printed circuit board and the board connector for a long period of time.

According to the second aspect of the present invention, a conductor that is not connected to the connection terminal is used as a member having less friction than the board surface of the printed board. Therefore, a conductor that is not connected to this connection terminal can be formed together with other conductors, so that the printed circuit board can be easily manufactured.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the printed circuit board according to the present invention will be described below with reference to FIG. FIG. 1 is a diagram showing a configuration of a printed circuit board according to the present invention. Note that, in FIG. 1, portions corresponding to those in FIG. 3 are denoted by the same reference numerals.

In FIG. 1, reference numeral 1a is a printed circuit board according to the present invention. The printed circuit board 1a is composed of a circuit section 2 on which electric parts are mounted to form an electric circuit, and a connection terminal section 3a for connecting to an external electric circuit.

The connection terminal portion 3a has a predetermined pattern from the board terminal 4 and the connection terminal 5a having a pattern formed in the direction from the circuit portion 2 of the printed board 1a to the board edge 4 so as to substantially coincide with the board edge 4. The connection terminals 5b are formed with patterns up to the positions spaced apart from each other, and the connection terminals 5c are formed with patterns formed up to the positions spaced apart from each other. In addition, between the connection terminal 5b having a pattern formed up to a position separated from the board plate edge 4 by a predetermined distance and the board plate edge 4,
A member having less friction than the board surface of the printed board, for example, the dummy pattern 6 that is not connected to the connection terminal 5b is formed. Similarly, a dummy pattern 7 which is not connected to the connection terminal 5c is formed between the connection terminal 5c and the board plate edge 4.

FIG. 2 is a cross-sectional view showing the insertion of the printed circuit board 1a on which the dummy patterns 6 and 7 are formed, showing the portion of the power supply terminal 5b on which the dummy pattern 6 is formed. As shown in FIG. 2A, the board connector 10
Connector electrode 12 is pressed against the dummy pattern 6 of the printed circuit board 1a, the connector electrode 12 and the dummy pattern 6 are slid, and then the connection terminal 5 is inserted as shown in FIG. 2B.
The pattern of b is pressed by the connector electrode 12 so that it is electrically connected. Although not shown, the connector electrode 12 of the board connector 10 presses the dummy pattern 7 of the printed board 1a, and the connector electrode 12 and the dummy pattern 7 are slid, and then the pattern of the connection terminal 5c is changed to the connector electrode 12 by the connector electrode 12. It is in a pressed state and is electrically connected.

Therefore, even if the printed circuit board 1a is repeatedly inserted into and removed from the board connector 10, the printed circuit board 1
Since the substrate surface of a and the connector electrode 12 do not slide, it is possible to reduce wear of the gold plating of the connector electrode 12. Furthermore, since the dummy patterns 6 and 7 can be formed at the same time as the formation of the connection terminals 5a, 5b and 5c, a new process is not required when forming the printed circuit board.

Further, the member having less friction than the substrate surface of the printed circuit board is not limited to the dummy patterns 6 and 7, but a metal plate is provided on the printed circuit board or resin coating having less friction is applied. Of course, it is good.

As described above, according to this embodiment, the wear of the connector electrode 12 can be reduced even if the printed circuit board 1a is repeatedly inserted into and removed from the board connector 10, so that a stable contact state can be obtained for a long period of time.

[0023]

According to the first aspect of the present invention, the printed circuit board is provided between the terminal of the printed circuit board and the connection terminal for connection with the board connector on which the conductor is formed up to a position separated from the board end by a predetermined distance. A member having less friction than the substrate surface of is disposed.
Therefore, even if the printed circuit board is repeatedly inserted into and removed from the circuit board connector, this member and the connector electrode slide, so that abrasion of the connector electrode such as gold plating due to sliding of the printed circuit board surface and the connector electrode is reduced. Therefore, a stable contact state between the printed board and the board connector can be obtained for a long period of time.

According to the second aspect of the present invention, a conductor that is not connected to the connection terminal is used as the member having less friction than the board surface of the printed board. Therefore, a conductor that is not connected to this connection terminal can be formed together with other conductors, so that the printed circuit board can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of a printed circuit board according to the present invention.

FIG. 2 is a cross-sectional view when the printed board according to the present invention is inserted into a board connector.

FIG. 3 is a diagram showing a configuration of a conventional printed circuit board.

FIG. 4 is an insertion diagram of a conventional printed circuit board.

FIG. 5 is a cross-sectional view when a conventional printed board is inserted and attached to a board connector.

[Explanation of symbols]

 1, 1a, 20 Printed circuit board 2 Circuit part 3, 3a Connection terminal part 4 Board plate end 5a, 5b, 5c Connection terminal 6, 7 Dummy pattern 10 Board connector 11 Board insertion port 12 Connector electrode

Claims (2)

[Claims] 1. A printed board to be inserted into a board connector for use, wherein a connection terminal for connecting to the board connector, in which a conductor is formed up to a position spaced apart from the board end of the printed board by a predetermined distance, is provided. A printed circuit board, wherein a member having less friction than a board surface of the printed circuit board is arranged between the connection terminal and the board plate end. 2. The printed circuit board according to claim 1, wherein the member is a conductor that is not connected to the connection terminal.