JP3058120U - Wiring cable connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a circuit element from being damaged even if a plurality of terminals of a connector are short-circuited by a conductive terminal of the wiring cable in a wiring cable connection structure, and to prevent a short circuit of a circuit. Therefore, it is possible to avoid an increase in parts and man-hours without requiring a dummy terminal or the like. SOLUTION: Non-adjacent pin terminals 2 of a connector 3
1 and 23 are allocated as power supply lines, and the pin terminals 22 located therebetween are allocated as ground lines. Thereby, when the conductive terminal 5 of the flat flexible cable 4 is connected to the connector 3, even if the adjacent pin terminals 21 and 22 are short-circuited by the conductive terminal 5, usually, an overcurrent flows through the power supply circuit and the power supply is turned off. Be cut off. For this reason, when the high-voltage and low-voltage power supply lines are short-circuited, a large current may flow through the element connected to the low-voltage power supply line, possibly destroying the element.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a wiring cable connection structure for connecting conductive terminals of a wiring cable to terminals of a connector in various electric devices.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, a configuration in which various devices are connected to a circuit on a printed circuit board using a wiring cable such as a flat flexible cable (FFC) has been generally adopted. FIG. 6 shows a conventional wiring cable connection structure. A socket-like connector 3 having a terminal 2 assigned as a power supply line or the like is mounted on a circuit board 1, and a conductive terminal 5 of an FFC 4 is connected to the terminal 2 of the connector 3. Each of the plurality of terminals 2 is assigned, for example, as a power supply line of 24V, 5V or the like.

Japanese Patent Application Laid-Open No. 5-160559 discloses a configuration in which a conductive layer of a film-shaped heat seal connector corresponding to an FFC is connected to a connection terminal of a printed circuit board. When connected to the connection terminals on the printed circuit board, one conductive layer of the heat seal connector is connected across the adjacent connection terminals because the space between the adjacent connection terminals is narrow, and the connection terminals may be short-circuited. . Therefore, it is disclosed that a dummy terminal is provided between a plurality of connection terminals formed on a printed circuit board so that a short circuit of the circuit does not occur even if the heat seal connector is slightly displaced.

[0004] Further, Japanese Patent Application Laid-Open No. H4-13765 discloses that in a configuration in which a device is connected to a circuit board by a flexible board corresponding to an FFC, a plurality of energizing circuit patterns formed on a flexible board are sandwiched. By forming grounding circuit patterns on both sides, even if the terminals on the flexible board and the terminals on the circuit board are mistakenly connected in the opposite direction, the circuit patterns for energization are not directly dropped to ground. What you can do is shown.

[0005]

[Problems to be solved by the invention]

 However, in the wiring cable connection configuration as shown in FIG. 6, when the FFC 4 is inserted obliquely with respect to the connector 3 as shown, the plurality of terminals 2 are short-circuited by the conductive terminals 5 of the FFC 4. For example, if the 24V and 5V lines are short-circuited, a 5V-driven IC or the like connected to the 5V line on the substrate may be broken.

Further, in the configuration disclosed in the above-mentioned publication, in order to prevent a short circuit of a circuit due to a positional shift of a terminal at the time of connection, an inherently unnecessary dummy terminal is required.・ Increases man-hours. In addition, in the configuration disclosed in the latter publication, when there are a plurality of power supply lines, there is still a possibility that contact between power supplies may occur when connecting both terminals of the flexible board and the circuit board.

[0007] The present invention has been made to solve the above-described problems, and a wiring cable such as an FFC is obliquely inserted into a connector, and terminals adjacent to the connector are connected by conductive terminals of the wiring cable. Even if the circuit is short-circuited, circuit elements will not be damaged and dummy terminals for preventing short-circuiting of the circuit due to misalignment of terminals will not be used, resulting in an increase in parts and man-hours. An object of the present invention is to provide a wiring cable connection structure that avoids the above.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a connection structure for connecting a conductive terminal of a wiring cable to a terminal of a connector, wherein the terminal of the connector has a plurality of terminals arranged in a row. Of these, a plurality of non-adjacent terminals are assigned as power lines, and terminals located between the terminals assigned as power lines are assigned as ground lines.

In this configuration, when connecting the conductive terminal of the wiring cable to the terminal of the connector, even if the wiring cable is slanted and the conductive terminal short-circuits the adjacent terminal of the connector, the adjacent terminal is not connected. If one is a single power line, the other is a ground line, and the power line and the ground line are short-circuited. In this case, a large current tends to flow transiently. However, the power supply circuit usually has an overcurrent protection circuit, and its operation does not damage the circuit. In other words, if a high-voltage power line and a low-voltage power line are short-circuited, a large current may flow through an element such as an IC connected to the low-voltage power line, possibly destroying the element. Does not occur. Also, the terminals of the ground line are not originally unnecessary like dummy terminals but are necessary.

The connector has a socket shape, and pin terminals are arranged in a row inside the socket. The wiring cable is a flat flexible cable, and a reinforcing sheet material is provided on the back side of the conductive terminal. The conductive terminal may be connected to the pin terminal by inserting the conductive terminal of the flat flexible cable into the socket of the connector. In this configuration, when the conductive terminal of the flat flexible cable is inserted into the socket of the connector, the conductive terminal is reinforced by the reinforcing sheet material, so that the insertion is easy and stable connection is possible.

[0011] In addition, a protection circuit that operates when a terminal allocated as a power supply line adjacent to the connector and a terminal allocated as a ground line is short-circuited and cuts off a power supply circuit may be further provided. I just need.

[0012]

[Embodiment of the invention]

 Hereinafter, a wiring cable connection structure according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of the wiring cable connection structure. A socket-shaped connector 3 having pin terminals 2 is mounted on the upper surface of the printed circuit board 1. One end of a flat flexible cable 4 (hereinafter, referred to as FFC) as a wiring cable is inserted into the connector 3, and 2 and the conductive terminal 5 of the FFC 4 are electrically connected. The pin terminals 2 of the connector 3 are provided side by side in the socket at a plurality of intervals in a row, and are connected to a printed wiring pattern of the printed circuit board 1. A plurality of conductive terminals 5 of the FFC 4 are formed corresponding to the pin terminals 2. In the opening 6 of the connector 3, separators 7 are provided at the above intervals. A reinforcing sheet material 8 is attached to the back surface of the conductive terminal 5 of the FFC 4. Various devices are connected to the other end of the FFC 4.

Each of the pin terminals 2 is connected to a power supply line of a predetermined printed wiring pattern, a ground line (earth), or the like. In particular, a plurality of non-adjacent terminals are connected to a power supply line (for example, 24 V , 5V, etc.), and the terminals located between these terminals allocated as power supply lines are allocated as ground lines.

FIG. 2 shows a configuration of the connector 3, and FIG. 3 shows a configuration of the pin terminals 2 in the connector 3. The pin terminals 2 are of different types (positions of the legs are alternately arranged) in the arrangement direction in order to facilitate connection of the legs to the printed wiring pattern.

FIG. 4 shows a configuration of the flat flexible cable 4 (FFC). In the FFC 4, the conductive terminals 5 are embedded in a base film 9 made of an insulator except for both end sides, and a reinforcing sheet material 8 is attached to the back surface on both end sides. Tin-plated soft copper foil is used as the conductor of the conductive terminal 5, polyester or the like is used as the base film 9 and the reinforcing sheet material 8 of the insulator, and phosphor bronze or the like is used as the pin terminal 2.

Further, the power supply circuit for applying power to the power supply line of the printed wiring pattern on the printed circuit board 1 includes a protection circuit such as a shunt regulator that shuts off the power supply due to an overcurrent. When the conductive terminal 5 of the FFC 4 short-circuits the pin terminal 2 allocated as the power supply line adjacent to the connector 3 and the pin terminal 2 allocated as the ground line, the protection circuit operates and the element of the element 3 due to overcurrent is activated. Destruction is prevented beforehand.

In the wiring cable connection terminal having the above configuration, when the conductive terminal 5 of the FFC 4 is connected to the pin terminal 2 (21, 22, 23) of the connector 3 as shown in FIG. Thus, even if the conductive terminal 5 short-circuits the adjacent pin terminals 21 and 222 of the connector 3, if one (21) is one power line (for example, 24V), the other (21) 22) is a ground line (GND), and the power supply line and the ground line are short-circuited. In this case, a large current tends to flow transiently, but the overcurrent protection circuit provided in the power supply circuit operates. Here, if the high-voltage power supply line and the low-voltage power supply line are short-circuited, a large current may flow through an element such as an IC connected to the low-voltage power supply line to destroy the element. In the embodiment, such a case does not occur.

Further, since the pin terminal 2 of the ground line is not originally unnecessary unlike the conventional dummy terminal but is necessary, the number of parts and man-hours do not increase. Further, when the conductive terminal 5 of the FFC 4 is inserted into the socket of the connector 3, the conductive terminal 5 is reinforced by the reinforcing sheet material 8, so that the insertion is easy and stable connection is possible.

The present invention is not limited to the configuration of the above embodiment, and various modifications are possible. For example, the mutual arrangement of the plurality of pin terminals 2 is such that when the conductive terminal 5 of the FFC 4 is inserted into the socket of the connector 3, the low-voltage line and the high-voltage line are short-circuited and the high voltage is applied to the low-voltage line. Any structure may be adopted as long as a ground line is allocated between them. Further, the connector 3 is not limited to the socket shape, and may be a printed pattern on a wiring board.

[0020]

[Effect of the invention]

 As described above, according to the wiring cable connection structure of the present invention, a plurality of non-adjacent terminals of the connector are allocated as power supply lines, and terminals located therebetween are allocated as ground lines. Even if the terminal short-circuits the adjacent terminal of the connector, the power supply line and the ground line will be short-circuited, but the high-voltage power line and the low-voltage power line will not be short-circuited. A large current does not flow from a high-voltage power supply line to an element such as an IC connected to the IC, thereby destroying the element. Although an overcurrent tends to flow in the power supply circuit due to a short circuit between the power supply line and the ground line, the power supply circuit is normally shut off by operating a protection circuit of the power supply circuit. Also, unlike the case where a dummy terminal is provided to prevent a short circuit from occurring due to a positional displacement of the terminal as in the related art, the terminal of the ground line is essentially required, and the There is no increase in man-hours.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a distribution cable connection structure according to an embodiment of the present invention.

2A is a plan view of the connector, FIG. 2B is a front view of the connector, and FIG. 2C is a side sectional view.

FIGS. 3A and 3B are side views of pin terminals of different types of connectors.

4A is a plan view of the FFC, FIG. 4B is a front view of the FFC, and FIG. 4C is a cross-sectional view of an end of the FFC.

FIG. 5 is a diagram illustrating the operation of the distribution cable connection structure according to the embodiment.

FIG. 6 is a diagram illustrating the operation of a conventional wiring cable connection structure.

[Explanation of symbols]

 2, 21, 22, 23 pin terminal 3 connector 4 flat flexible cable (wiring cable) 5 conductive terminal 8 reinforcing sheet material

Claims (3)

[Utility model registration claims] 1. A wiring cable connection structure for connecting a conductive terminal of a wiring cable to a terminal of a connector, wherein the terminal of the connector has a plurality of terminals arranged in a row. A plurality of terminals are assigned as power lines, and terminals located between the terminals assigned as power lines are assigned as ground lines. 2. The connector according to claim 1, wherein the connector has a socket shape.
Pin terminals are arranged in a row inside the socket. The wiring cable is a flat flexible cable, and a reinforcing sheet material is provided on the back side of the conductive terminal. The flat cable is provided inside the socket of the connector. 2. The conductive terminal according to claim 1, wherein the conductive terminal is connected to the pin terminal by inserting a conductive terminal of the flexible cable.
Wiring cable connection structure described in 1. 3. A protection circuit that operates when a terminal assigned as a power supply line adjacent to the connector and a terminal assigned as a ground line are short-circuited and shuts off a power supply circuit. The wiring cable connection structure according to claim 1 or 2, wherein: