JP5465918B2 - Noise suppression structure - Google Patents

Description

  The present invention relates to a noise countermeasure structure in a configuration in which a booster circuit unit and a boosting capacitor are coupled by a connector.

  Conventionally, as a connector provided on a wiring board or the like on which a liquid crystal display (hereinafter referred to as LCD) is mounted, a connector that electrically connects a wiring board to another board or an external device is known ( For example, see Patent Document 1).

  In such a connector, a plurality of LCD terminal insertion portions into which LCD terminals are inserted are provided, and a connector terminal is provided on one side of each LCD terminal insertion portion. This connector terminal is connected to a booster circuit section provided on the wiring board, a boosting capacitor provided outside the wiring board, and the like.

JP 2008-102336 A

  By the way, in the configuration in which the connector terminal is provided on one side of each LCD terminal insertion portion, the size of the connector has been increased. Therefore, the connector terminals are provided alternately (in a staggered pattern) on one side and the other side of each LCD terminal insertion portion. Thus, the connector terminals can be provided on the opposite side between the connector terminals without changing the pitch between the adjacent connector terminals provided on the same side, and the size of the connector can be reduced.

  However, in a connector with staggered connector terminals, when a boosting capacitor is provided between adjacent connector terminals, the wiring pattern connecting the connector terminal-boosting capacitor-connector terminal surrounds the LCD terminal insertion portion. The wiring pattern that is disposed and connected to the boosting capacitor becomes a long distance. For this reason, there is a concern that noise generated from the boosting capacitor is radiated from the long wiring pattern and the noise resistance performance is deteriorated.

  Accordingly, an object of the present invention is to provide a noise countermeasure structure that can reduce the component size and improve the noise resistance performance.

  The invention according to claim 1 is a noise countermeasure structure in which a booster circuit portion provided on a first wiring board and a boosting capacitor provided on a second wiring board are electrically connected by a connector, The connector includes a rectangular housing, and is provided with a plurality of rows in the length direction and terminal insertion portions that can be electrically connected to the first wiring board side, and one side in the width direction from each terminal insertion portion. Connector terminals alternately provided on the other side and electrically connectable to the second wiring board side, and the boosting capacitor is electrically connected to the adjacent connector terminal on the same side in the width direction. The boosting circuit portion is electrically connected to the terminal insertion portion where the connector terminal connected to the boosting capacitor is located, and the connector terminal located between the connector terminals connected to the boosting capacitor is: The second Characterized in that the wiring substrate side are electrically connected non vacant terminals.

  In the noise countermeasure structure according to the first aspect, since the connector terminals are alternately provided on one side and the other side in the width direction from each terminal insertion portion, the size of the connector can be reduced. In addition, since the boosting capacitor is connected to the adjacent connector terminal on the same side in the width direction, the pitch between the connector terminals connected to the boosting capacitor can be made equal to the pitch between the conventional connector terminals.

  For this reason, it is not necessary to make the wiring pattern connecting the connector terminal-capacitor for boosting-connector terminal long distance, and radiation from the wiring pattern of noise generated from the boosting capacitor can be suppressed. In addition, the connector terminal that is an empty terminal provided in the part where the boosting capacitor is located is a part of the plurality of connector terminals, so the connector size is small without major design changes of the connector and peripheral members. Can be maintained.

  Accordingly, the component size can be reduced and the noise resistance performance can be improved.

It is the schematic which shows the noise countermeasure structure in the connector which concerns on embodiment of this invention. It is a block diagram of the noise countermeasure structure which concerns on embodiment of this invention. It is a top view when arrange | positioning a connector on the 2nd wiring board which concerns on embodiment of this invention. It is a circuit diagram of a noise countermeasure structure according to an embodiment of the present invention. It is a figure which shows the noise with respect to the frequency in the conventional structure. It is a figure which shows the noise with respect to the frequency in the noise countermeasure structure which concerns on embodiment of this invention.

  A noise countermeasure structure according to an embodiment of the present invention will be described with reference to FIGS.

  The noise countermeasure structure according to the present embodiment includes a booster circuit unit 5 provided on a first wiring board (not shown) of an LCD driver 3 mounted in the LCD 1 and a second wiring arranged outside the LCD 1. This is applied to a configuration in which a boosting capacitor 9 provided on a substrate 7 is electrically connected by an LCD connector 11 as a connector. Further, the LCD connector 11 is composed of a rectangular housing, and is provided with a plurality of rows in the length direction and is electrically connectable to the first wiring board side, and a width direction from each terminal insertion portion 13. Connector terminals 15 that are alternately provided on one side and the other side and that can be electrically connected to the second wiring board 7 side.

  The boosting capacitor 9 is electrically connected to the adjacent connector terminals 15a and 15b on the same side in the width direction, and the boosting circuit unit 5 has the connector terminals 15a and 15b connected to the boosting capacitor 9 positioned therein. The connector terminal 15c that is electrically connected to the terminal insertion portions 13a and 13b and located between the connector terminals 15a and 15b connected to the boosting capacitor 9 cannot be electrically connected to the second wiring board 7 side. It is an empty terminal.

  As shown in FIGS. 1 to 4, the LCD 1 is provided with an LCD display unit 17 and serves as an information display unit provided in a vehicle speedometer, fuel gauge, and the like. An LCD driver 3 is accommodated in the LCD 1, and the LCD driver 3 is provided with a booster circuit unit 5 and a drive signal processing unit 19 provided on the first wiring board.

  The booster circuit unit 5 is provided on the first wiring board and is electrically connected to the LCD terminal 21 provided in the LCD 1. The situation in the booster circuit unit 5 is transmitted to the drive signal processing unit 19 provided on the first wiring board. The drive signal processing unit 19 is electrically connected to the CPU 23 disposed outside the LCD 1 via the LCD terminal 21 and the LCD connector 11, and transmits the information of the booster circuit unit 5 to the CPU 23 and receives control information from the CPU 23. Communicated. The booster circuit unit 5 provided in the LCD 1 is electrically connected to the boosting capacitor 9 via the LCD connector 11 and boosted by the boosting capacitor 9.

  The step-up capacitor 9 is provided on the second wiring board 7 arranged outside the LCD 1. The boosting capacitor 9 is electrically connected to the connector terminals 15 a and 15 b of the LCD connector 11 by lands 25 and wiring patterns 27 provided on the second wiring board 7. By inserting the LCD terminal 21 connected to the booster circuit unit 5 into the terminal insertion portions 13a and 13b where the connector terminals 15a and 15b are located, the booster capacitor 9 and the booster circuit unit 5 are electrically connected. Connected. Thus, the booster circuit unit 5 and the booster capacitor 9 are electrically connected via the LCD connector 11.

  The LCD connector 11 is formed of a rectangular housing and includes a plurality of terminal insertion portions 13 and a plurality of connector terminals 15. The plurality of terminal insertion portions 13 are provided in a plurality of rows in the length direction of the housing, and the LCD terminal 21 of the LCD 1 is inserted to electrically connect the LCD 1 and the LCD connector 11. The LCD terminal 21 of the LCD 1 has a vacant terminal that is not electrically connected to the LCD driver 3 or the like provided in the LCD 1, and the portion where the vacant terminal is inserted into the terminal insertion portion 13 is the LCD 1. The LCD connector 11 is not electrically connected.

  The plurality of connector terminals 15 are alternately provided in a staggered pattern from each terminal insertion portion 13 on one side and the other side in the width direction of the housing. The connector terminals (for example, 15a, 15b, etc.) provided in the same direction (one side or the other side in the width direction of the housing) among the plurality of connector terminals 15 have a pitch between adjacent connector terminals of the conventional staggered feet. The pitch is set to be equal to the pitch between adjacent connector terminals of a connector that is not provided with a connector terminal. For this reason, the terminal insertion part 13 of the LCD connector 11 and the connector terminal 15 can be made to correspond also to the LCD terminal of LCD corresponding to the conventional connector, and the versatility of the LCD connector 11 can be improved. .

  In such an LCD connector 11, the boosting capacitor 9 is electrically connected to adjacent connector terminals 15a and 15b on the same side in the width direction. Further, the booster circuit unit 5 is electrically connected to the terminal insertion portions 13 a and 13 b where the connector terminals 15 a and 15 b are located, and the booster capacitor 9 and the booster circuit unit 5 are electrically connected via the LCD connector 11. The In this state, the connector terminal 15c located between the connector terminals 15a and 15b and provided on the opposite side of the housing in the width direction is not electrically connected to the second wiring board 7. It is an empty terminal. Note that the LCD terminal 21 inserted into the terminal insertion portion 13c where the connector terminal 15c that is an empty terminal is located is also an empty terminal without being electrically connected to the first wiring board.

  5 and 6, when the boosting capacitor 9 is connected by the land and the wiring pattern so as to surround the terminal insertion portion 13 between the connector terminal 15a and the connector terminal 15c (FIG. 5), the connector terminals 15a and 15b are connected. FIG. 6 shows noise with respect to frequency when the step-up capacitor 9 is connected to the connector terminal 15c and the connector terminal 15c located between the connector terminals 15a and 15b is an empty terminal (FIG. 6). The line located at the top is the average value at the peak of the frequency, and the line located at the bottom is the average value of the entire frequency. Further, a line located on the upper line side is set as a noise limit value. In this way, by connecting the boosting capacitor 9 to the connector terminals 15a and 15b and using the connector terminal 15c positioned between the connector terminals 15a and 15b as an empty terminal, the generation of noise can be suppressed.

  In such a noise countermeasure structure, the connector terminals 15 are alternately provided on the one side and the other side in the width direction from the respective terminal insertion portions 13, so that the size of the LCD connector 11 can be reduced. Further, since the boosting capacitor 9 is connected to the adjacent connector terminals 15a and 15b on the same side in the width direction, the pitch between the connector terminals 15a and 15b connected to the boosting capacitor 9 is set to the pitch between the conventional connector terminals. Can be equivalent.

  For this reason, it is not necessary to make the wiring pattern 27 connecting the connector terminal 15a, the boosting capacitor 9 and the connector terminal 15b long, and radiation of noise generated from the boosting capacitor 9 from the wiring pattern 27 can be suppressed. . In addition, the connector terminal 15c, which is an empty terminal provided in the portion where the boosting capacitor 9 is located, is a part of the plurality of connector terminals 15, and thus involves a large design change of peripheral members such as the LCD connector 11 and the LCD1. Therefore, the size of the LCD connector 11 can be kept small.

  Accordingly, the component size can be reduced and the noise resistance performance can be improved.

  The noise countermeasure structure according to the embodiment of the present invention is applied to a configuration in which a booster circuit unit provided in the LCD and a boosting capacitor provided outside the LCD are connected by a connector. The present invention is not limited to this, and can be applied to any device as long as the booster circuit unit and the booster capacitor are connected by a connector.

DESCRIPTION OF SYMBOLS 5 ... Boosting circuit part 7 ... 2nd wiring board 9 ... Boosting capacitor 11 ... LCD connector (connector)
13 ... Terminal insertion part 15 ... Connector terminal

Claims (1)

A noise countermeasure structure in which a booster circuit portion provided on a first wiring board and a boosting capacitor provided on a second wiring board are electrically connected by a connector,
The connector includes a rectangular housing, and is provided with a plurality of rows in the length direction and terminal insertion portions that can be electrically connected to the first wiring board side, and one side in the width direction from each terminal insertion portion. A connector terminal provided alternately on the other side and electrically connectable to the second wiring board side;
The boosting capacitor is electrically connected to the connector terminal adjacent on the same side in the width direction, and the boosting circuit unit is electrically connected to the terminal insertion portion where the connector terminal connected to the boosting capacitor is located. Connected,
The noise countermeasure structure, wherein the connector terminals located between the connector terminals connected to the boosting capacitor are empty terminals that cannot be electrically connected to the second wiring board side.

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