JP2011192512A - Receptacle and electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a receptacle facilitated in pairing of a ground terminal and a signal terminal and improved in noise resistance, and to provide electronic equipment using the same. <P>SOLUTION: This receptacle includes: two signal terminals (2a-2d), through which signals having an opposite phase to each other are transmitted; and ground terminals (1a-1d) provided on a second plane facing parallel to a first plane including the two signal terminals. The ground terminals have wide parts (51a-51d) widened in width so as to be overlapped with the two signal terminals with a view from a normal direction of the first plane. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a receptacle, and an electronic apparatus including a receptacle and a printed board.

In recent years, high-speed transmission of digital signals between electronic devices (for example, AV devices, portable terminals, etc.) via an interface compliant with the HDMI (High-Definition Multimedia Interface: registered trademark) standard or the USB (Universal Serial Bus) standard, etc. This technique is widely used.
Such an interface includes a receptacle placed on a placement surface of a printed circuit board built in the electronic device, and a plug fitted into the receptacle. In addition, these interfaces are mainly used for transmitting signals having opposite phases to two pairs of wires. Specifically, a transmission system called a differential transmission system or a TMDS (Transition Minimized Differential Signaling) system is adopted. The characteristic of this transmission method is that it reduces signal deterioration such as reflection by forming a transmission line that adjusts the width of the wiring and the distance to the ground so that it has a constant characteristic impedance with respect to the ground plane as a reference High-speed transmission is possible.

  It is relatively easy to form the transmission line structure as described above with a coaxial cable or a multilayer printed board. Further, the structure of the connector connecting them is also defined in detail by the interface standard, and consideration is given so as not to deteriorate the signal. However, the connection structure between the connector and the substrate (that is, the structure of the receptacle) is difficult to form a transmission line structure because there is an aerial wiring portion between the connector and the substrate. Also, the structure of the interface standard is not specified, which is a major factor in signal degradation. In addition, the connection structure between the board and the connector may differ slightly depending on the connector manufacturer. Therefore, depending on the type and grade of the substrate, signal wiring on the substrate may become difficult and may cause new signal degradation.

  6A and 6B are diagrams showing an example of a conventional configuration in which the arrangement of the ground terminals is devised in the receptacle. FIG. 6A is a perspective view, and FIG. 6B is a cross-sectional view of the internal structure (see, for example, Patent Document 1). ). In this conventional example, a ground terminal is arranged so as to divide a plurality of pseudo differential signal pair terminals for each pair to suppress interference between the differential signal pair terminals. When the terminal arrangement is a two-stage zigzag structure, the ground terminal is arranged at the center terminal facing the differential signal pair terminal, and the distance between the ground terminal and the differential signal pair terminal is made equal so that the characteristic impedance is reduced. It has a structure that suppresses variations.

JP 2007-80782 A

  However, in the structure of the conventional example described above, the distance between the ground terminal and the plurality of differential signal pair terminals is equal, and it is difficult to pair the differential signal pair terminal and the ground terminal. In addition, since the transmission line structure is formed as a reference ground plane of two differential signal pair wirings with one ground terminal, there is a problem that noise resistance deteriorates.

In other words, in an interface having a pair of signal terminals and a dedicated ground terminal, the distance between the ground terminal and other signal terminals is also close, so a transmission line structure sufficient to maintain a certain characteristic impedance must be formed. Is difficult.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a receptacle and an electronic device that facilitate pairing between a ground terminal and a signal terminal and have improved noise resistance.

  A receptacle according to the present invention is a receptacle placed on a placement surface of a printed circuit board, and includes a first plane including two signal terminals for transmitting signals of opposite phases to each other and the two signal terminals. And a ground terminal provided on a second plane opposite to the first plane, the width of the ground terminal overlapping with the two signal terminals when viewed from the normal direction of the first plane. The structure which has the wide part which expanded is taken.

  In addition, an electronic apparatus according to the present invention employs a configuration including the receptacle and a printed board having a placement surface on which the receptacle is placed.

  ADVANTAGE OF THE INVENTION According to this invention, the receptacle and electronic device which made the pairing of a ground terminal and a signal terminal easy, and improved noise resistance can be provided.

A perspective view showing a configuration of the interface 10 The partial perspective view which shows the internal structure of the receptacle which concerns on Embodiment 1 (A) Cross-sectional view in the vicinity of the ground terminal 1a and the pair signal terminal 2a, (b) A-A 'cross-sectional view The fragmentary perspective view which shows the internal structure of the receptacle which concerns on Embodiment 2. FIG. (A) Cross-sectional view in the vicinity of the ground terminal 1a and the pair signal terminal 2a, (b) A-A 'cross-sectional view Diagram showing conventional configuration

  Next, embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, the drawings are schematic, and the ratio of each dimension may be different from the actual one. Accordingly, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

(Embodiment 1)
<Interface configuration>
The configuration of the interface according to the first embodiment will be described with reference to the drawings. In the present embodiment, an interface 10 conforming to the HDMI standard will be described as an example of an interface between electronic devices. The electronic device is, for example, an AV device, a portable terminal, a personal computer, or the like.

  FIG. 1 is a perspective view showing a configuration of an interface 10 according to the first embodiment. As shown in FIG. 1, the interface 10 includes a printed wiring board 11, a receptacle 12, and a plug 13.

  The printed wiring board 11 is built in a first electronic device (not shown). The printed wiring board 11 includes a substrate body 11A and a wiring group 11B. The substrate body 11A has a mounting surface FMNT.

  Receptacle 12 is mounted on mounting surface FMNT at end 11EDG of printed wiring board 11. The receptacle 12 includes a housing 12A, an opening 12B, a terminal insulating plate 12C, and a terminal group 12D. The configuration of the receptacle 12 will be described later.

  The plug 13 is provided in a second electronic device (not shown). The plug 13 is connected to the receptacle 12 by being inserted into the opening 12B. The plug 13 transmits a digital signal between the first electronic device and the second electronic device.

<Receptacle structure>
Next, the configuration of the receptacle according to the first embodiment will be described with reference to the drawings. FIG. 2 is a partial perspective view showing the internal structure of the receptacle 12. In FIG. 2, the description of the housing 12A is omitted.

  The terminal group 12D of the receptacle 12 includes ground terminals 1a to 1e, pair signal terminals 2a to 2d that are two signal terminals for transmitting signals having opposite phases to each other, and other terminals 3 that are other signals and power supply terminals. Have.

  The terminal group 12D includes an insulating plate wiring portion 4 guided by the terminal insulating plate 12C, a soldering portion 6 provided on the terminal insulating plate 12C and the wiring group 11B of the printed wiring board 11, and the insulating plate wiring portion 4. And an aerial wiring portion 5 connecting the soldering portion 6.

  The soldering unit 6 is soldered and connected to ensure electrical connection with the wiring group 11B.

  The terminal insulating plate 12C serves as a guide for fixing the ground terminals 1a to 1e, the pair signal terminals 2a to 2d, and the other terminals 3. The terminal insulating plate 12C is made of an insulating material such as a resin material.

  Here, the structure of the aerial wiring part 5 will be described in detail. Wide portions 51a to 51e are provided in the aerial wiring portions of the ground terminals 1a to 1e, respectively. FIG. 3A is a cross-sectional view of the vicinity of the ground terminal 1a and the pair signal terminal 2a when viewed from the positive x-axis direction shown in FIG. FIG. 3B is a cross-sectional view taken along the line A-A ′ of FIG.

  As shown in FIG. 3, in the aerial wiring portion 5, the ground terminal 1 a is located on a second plane opposite to the first plane including the pair signal terminal 2 a. In other words, the ground terminal 1a and the pair signal terminal 2a are disposed at different positions in the y-axis direction in the aerial wiring portion 5. The x-axis direction is the arrangement direction of the terminal group 12D, the z-axis direction is the normal direction of the mounting surface FMNT of the printed circuit board, and the y-axis direction is a direction orthogonal to the x-axis and the z-axis.

  The wide portion 51a is configured by widening the ground terminal 1a so as to overlap the pair signal terminal 2a when viewed from the normal direction (y-axis direction) of the first plane.

  Similarly, the ground terminals 1b to 1d also have wide portions 51b to 51d in which the terminal width is increased so as to overlap the adjacent pair signal terminals 2b to 2d in the aerial wiring portion 5.

  Further, the ground terminal 1e similarly has a wide portion 51e in which the terminal width is increased so as to overlap with the adjacent other terminals 3.

  As described above, the ground terminals 1a to 1d have the wide portions 51a to 51d in which the terminal widths are enlarged so as to overlap the adjacent pair signal terminals 1a to 1d in the aerial wiring portion 5, so that the wide portions 51a to 51d. A coupled microstrip line having 51d as the ground plane can be formed. According to such a configuration, a coupled microstrip line, which is one of transmission line structures with good high-frequency characteristics, can be configured in the receptacle 12, and the connection between the receptacle and the substrate, which has been difficult until now, can be achieved. Signal degradation can be reduced.

  The characteristic impedance of the coupled microstrip line is, for example, an HDMI standard value by changing the width of the pair signal terminals 2a to 2d of the aerial wiring portion 5 and the distance between the pair signal terminals 2a to 2d and the ground terminals 1a to 1d. It can be adjusted to a certain differential 100Ω.

(Embodiment 2)
Next, a second embodiment of the present invention will be described with reference to FIGS. The second embodiment is different from the first embodiment in that a dielectric is provided between the pair signal terminal and the ground terminal in the aerial wiring portion.

  FIG. 4 is a partial perspective view showing the internal structure of the receptacle according to the second embodiment. FIG. 5A is a cross-sectional view of the vicinity of the ground terminal 1a and the pair signal terminal 2a when viewed from the positive x-axis direction shown in FIG. FIG. 5B is a cross-sectional view taken along the line A-A ′ of FIG.

  As shown in FIG. 4, the receptacle 12 includes a plate-like dielectric 7 provided between a pair signal terminal and a ground terminal. The dielectric 7 may be a dielectric 15 interposed between at least one of the pair signal terminals 2a to 2e and the ground terminal.

  By adjusting the dielectric constant of the dielectric 7 as described above, the characteristic impedance of the line formed by the pair of pair signal terminals and the ground terminal can be easily adjusted. In addition, since the pair of signal terminals and the ground terminal are held by the dielectric 7, the mechanical strength of the receptacle 12 can be further improved.

(Other embodiments)
Although the present invention has been described according to the above-described embodiments, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  For example, in the above embodiment, an interface conforming to the HDMI standard has been described as an example of an interface between electronic devices, but the present invention is not limited to this. For example, as an interface between electronic devices, a serial interface conforming to a standard such as USB, DVI (Digital Visual Interface: registered trademark), or IEEE (Institut of Electrical and Electronic Engineers) 1394 can be used.

  In the above-described embodiment, the pair of pair signal terminals transmit a signal by a pseudo differential transmission system based on the TMDS system or the like, but the present invention is not limited to this. For example, the pair of signal terminals T may transmit signals by a differential transmission method based on the USB standard.

  As described above, the present invention naturally includes various embodiments not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

  The present invention is suitable for improving the noise performance of a receptacle having a pair signal terminal and a ground terminal.

DESCRIPTION OF SYMBOLS 10 Interface 11 Printed wiring board 11A Board body 11B Wiring group 11EDG End part 12 Receptacle 12A Case 12B Opening 12C Terminal insulation board 12D Terminal group 13 Plug 1a, 1b, 1c, 1d Ground terminal 2a, 2b, 2c, 2d Pair signal terminal 3 Other terminal 4 Insulating board wiring part 5 Aerial wiring part 51a, 51b, 51c, 51d Wide part 6 Soldering part 7 Dielectric

Claims (6)

A receptacle placed on a placement surface of a printed circuit board,
Two signal terminals for transmitting signals of opposite phase to each other;
A ground terminal provided on a second plane opposite to the first plane including the two signal terminals; and
The ground terminal has a wide portion widened so as to overlap with the two signal terminals when viewed from the normal direction of the first plane.
Receptacle. The wide portion and the two signal terminals form a coupled microstrip line that is one of transmission line structures.
The receptacle according to claim 1. The two signal terminals are differential signal terminals.
The receptacle according to claim 1 or 2. The two signal terminals are pseudo differential signal terminals.
The receptacle according to claim 1 or 2. A dielectric provided between the wide portion and the two-wire signal terminal;
The receptacle according to any one of claims 1 to 4. The receptacle according to any one of claims 1 to 5;
A printed circuit board having a mounting surface on which the receptacle is mounted,
Electronics.

Images