JP2009037971A - Board-mounting connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a board-mounting connector which has a small occupied area on a circuit board and is suitable for differential signal transmission and lessens the number of contacts. <P>SOLUTION: The board-mounting connector has a plurality of contact sets made of independent ground contacts 2, 5, 8, and 11 and signal contact pairs for differential transmission 1, 3; 4, 6; 7, 9; 10, 12 located at a distance equal to the ground contact on their fitting sections. The adjacent contact sets in the fitting sections are alternately arranged so that the tops of triangles constituted by the ground contacts of respective contact sets and the signal contact pairs for differential transmission are mutually inverse. The fitting section of the board-mounting connector is arranged so as to make its longitudinal direction extend in the direction orthogonal to a mounting surface of a circuit board, and contact sections of the plurality of ground contacts are extended from a single ground plate 27 arranged between two lines of the signal contacts. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a board-mounted connector, and more specifically, a board-mounted type having a plurality of contact sets including a signal contact pair and a ground contact and suitable for high-speed digital transmission between a personal computer (PC) body and a liquid crystal display. Concerning connectors.

Differential signal transmission has the advantage that noise is less likely to occur compared to single-ended (unbalanced) transmission because it uses two signals of equal magnitude in voltage and 180 ° in phase. . For this reason, differential signal transmission has been frequently used in fields where high-speed transmission is required.
JP 2002-334748 A (FIGS. 1 and 4) Japanese Patent Laid-Open No. 2001-210429 (FIG. 6)

  Patent Document 1 discloses the above-described connector assembly for differential signal transmission based on the HDMI (High-Definition Multimedia Interface) standard. This connector assembly includes a plug and a receptacle (board-mounted connector) each having a plurality of contact sets each including a specific ground contact and a pair of signal contacts located at an equal distance from the ground contact in the fitting portion. It has. These sets of contacts are alternately arranged so that the isosceles triangles composed of the pairs of ground contacts and signal contacts adjacent to each other are opposite to each other. In the receptacle, contacts arranged in two rows at the fitting portion are converted into three rows and arranged in the board connection portion. The substrate connection portion of the ground contact is arranged in the center row of the three rows.

  However, in the receptacle described in Patent Document 1, the extending direction of the two contact rows in the fitting portion (or the longitudinal direction of the fitting portion) is parallel to the mounting surface of the circuit board on which the receptacle is mounted. is there. For this reason, there exists a problem that the occupation area on a board | substrate is large. This problem is particularly serious when the substrate size is limited as in a notebook PC. In addition, since the number of ground contacts is the same as the number of sets, the total number of contacts increases.

  Patent Document 2 discloses a board-mounted connector that is mounted on a circuit board such that the longitudinal direction of the fitting portion is perpendicular to the mounting surface of the circuit board (vertical direction). In this connector, the contact portion of the contact extends substantially parallel to the mounting surface of the circuit board, and the substrate connecting portion of the contact extends downward in the direction orthogonal to the mounting surface of the circuit board. Since the longitudinal direction of the fitting portion is orthogonal to the mounting surface of the circuit board, the area occupied by the connector on the circuit board is small. However, the contact rows that are aligned in the vertical direction in the fitting portion are merely converted into one terminal row that is aligned in parallel with the edge of the circuit board in the board connection portion. The improvement of the transmission characteristics due to is not considered.

  Accordingly, an object of the present invention is to provide a board-mounted connector that occupies a small area on a circuit board, is suitable for differential signal transmission, and has a small number of contacts.

  The board-mounted connector of the present invention includes a housing having a fitting portion and mounted on a circuit board, a ground contact in the fitting portion, and a pair of signal contacts located at an equal distance from the ground contact. The contact sets adjacent to each other in the fitting portion are alternately arranged so that the triangles composed of the ground contact and the signal contact pair of each contact set are opposite to each other. In the fitting portion, contact portions of the ground contact and the signal contact extend substantially parallel to a mounting surface of the circuit board, and a substrate connecting portion of the ground contact and the signal contact is mounted on the circuit board. In the board-mounted connector extending in a direction orthogonal to the surface, the fitting portion has a longitudinal direction on the mounting surface of the circuit board. The contact portions of the plurality of ground contacts extend from a single ground plate disposed between two rows of the signal contacts. .

  It is preferable that the contact portion of the ground contact extends offset from the ground plate in each of two contact rows in the fitting portion.

  It is preferable that the number of the board connection portions of the ground contact is smaller than the number of the contact portions of the ground contact in the fitting portion.

  In the board-mounted connector of the present invention, since the fitting portion is arranged so that the longitudinal direction thereof extends in a direction perpendicular to the mounting surface of the circuit board, the occupied area on the circuit board can be greatly reduced. In addition, since the contact portions of the plurality of ground contacts extend from a single ground plate disposed between the two rows of signal contacts, the number of contacts constituting the connector can be reduced while maintaining good transmission characteristics. Can be significantly reduced.

  In addition, the contact portion of the ground contact extends offset from the ground plate to each of the two contact rows in the fitting portion with respect to the ground plate without increasing the number of ground contacts in the fitting portion. A contact set comprising a single ground contact and a pair of signal contacts can be constructed.

  Furthermore, since the number of substrate contact portions of the ground contact is smaller than the number of contact portions of the ground contact in the fitting portion, the number of through holes formed in the circuit substrate can be reduced and the layout flexibility of the circuit board wiring pattern can be reduced. Can be improved.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings. FIG. 1 shows an embodiment of a board-mounted connector according to the present invention, and is a (A) front view, (B) right side view, (C) plan view, and (D) bottom view.

  In FIG. 1, a board-mounted connector or header 30 includes a housing 32, contacts (signal contacts 22 and ground contacts 26) arranged in two rows at a fitting portion 34 of the housing 32, and a housing 32 at the fitting portion 34. And a metal shell 60 covering the entire circumference of the metal shell.

  The housing 32 is formed by molding a suitable insulating plastic, and is provided with a chamfer 36 that appears in the upper left corner in the front view, and is defined by an upper surface 38, a lower surface 40, and both side surfaces 42, 44. Make a rectangle. A platform 48 is provided at the center of the fitting portion 34 so as to protrude forward (leftward in FIG. 1B) from the bottom surface 46 at the back. Contacts (signal contacts 22 and ground contacts 26) are arranged in a row on both sides of the platform 48.

  The shell 60 is formed by stamping and bending a suitable metal plate, and includes an inclined wall 62, an upper wall 64, a lower wall 66, and a chamfer 36, an upper surface 38, a lower surface 40, and both side surfaces 42, 44 of the housing 32, respectively. It forms a substantially rectangular parallelepiped having both side walls 68 and 70 and a rear wall 72 covering almost the entire rear of the header 30. The inclined wall 62, the upper wall 64, the lower wall 66, and both side walls 68 and 70 cooperate to define a recess for receiving the mating plug 100 (see FIG. 6). On the front ends of the upper wall 64, the lower wall 66, and the side walls 68, 70, mating plug guide portions 74, 76, 78, 80 that extend outwardly away from the platform 48 are integrally formed. Locking pieces 82 extending inward and forward are integrally formed on the side walls 68 and 70. These locking pieces 82 are used to lock the plug and the header by engaging with the recesses on the side surface of the plug when fitted with the mating plug. Connection legs (substrate connection portions) 84 and 84 are integrally formed at the lower ends of the front ends of the side walls 68 and 70 and are further folded downward after being folded back and outward from the front ends. In addition, connecting legs 86 and 86 extending downward are integrally formed at the lower rear ends of the side walls 68 and 70. The front connection leg 84 may extend downward from the lower ends of the side walls 68 and 70 in the same manner as the rear connection leg 86. A contact piece 88 extending inward and rearward is formed on the upper wall 64. The contact piece 88 is used to electrically connect the shell 60 and the shell of the plug (ground connection) when mated with the plug. The lower wall 66 is formed by seaming plate-like portions 66a and 66b extending from the lower ends of the side walls 68 and 70 to each other by a dovetail / groove 90 having a complementary shape.

  FIG. 2 is a perspective view showing only the signal contact 22 and the ground contact 26 without the housing 32 and the shell 60 from the header 30 of FIG. FIG. 3 is a perspective view of the contact model of FIG. 2 viewed from another direction. 4A is a front view, FIG. 4B is a right side view, and FIG. 4C is a bottom view. FIG. 5 is a perspective view showing a model of the ground contact 26 only.

  Referring to FIGS. 2 to 5, the contacts of the header 30 are signal contacts 1, 3, 4, 6, 7, 9, 10, 12, 15, 17 for performing differential transmission defined by the HDMI standard. , A ground contact 26 and other contacts 13, 14, 18, 19, 20. However, in this specification, for convenience, contacts other than the ground contact 26 may be collectively referred to as the signal contact 22.

  As clearly shown in FIG. 5, the ground contact 26 has a rectangular flat plate base (ground plate) 27, offset from the flat plate base 27 from the front end of the flat plate base 27, parallel to the flat plate base 27 and horizontally. A plurality of contact portions 28 extending forward, and a plurality of connection legs (substrate connection portions) 29 extending downward from the lower end of the flat base portion 27.

  As shown in FIGS. 2 to 4, each signal contact 22 has a base portion 23 extending in the horizontal direction, a contact portion 24 extending inward from the front end of the base portion 23, and then extending forward in the horizontal direction, and the rear of the base portion 23. Each has a connection leg (substrate connection part) 25 extending vertically downward from the end. Of the signal contacts 22, 1 and 3, 4 and 6, 7 and 9, and 10 and 12 constitute four pairs of high-speed differential signal transmission pairs, and 15 and 17 represent one. A pair of low-speed differential signal transmission pairs is formed. The contact portions of these differential transmission signal contacts 1, 3, 4, 6, 7, 9, 10, 12, 15, 17 are given the symbol “M”, and the substrate connection portion is given the symbol “T”. I will give it. For example, “1M” represents a contact portion of the differential transmission signal contact 1, and “1T” represents a substrate connection portion of the differential transmission signal contact 1.

  As is apparent from FIGS. 4A and 4C, the contact portions of the contacts (signal contact 22 and ground contact 26) are aligned in two rows. For convenience, the right column in FIG. 4A is referred to as a first column of contact portions, and the left column is referred to as a second column of contact portions. Since the contact portions 5 and 11 of the ground contact 26 are offset to the right side with respect to the flat base 27, they belong to the first row of contact portions. Similarly, since the contact portions 2 and 8 of the ground contact 26 are offset to the left side with respect to the flat base portion 27, they belong to the second row of contact portions. The contact portions 1M and 3M of the signal contact pairs 1 and 3 for differential transmission belong to the first column, and the contact portion 2 of the related ground contact 26 belongs to the second column. For this reason, the group which consists of these contact parts comprises the 1st triangle. When paying attention to the adjacent signal contact pairs 4 and 6 for differential transmission, the contact portions 4M and 6M belong to the second row, and the contact portion 5 of the related ground contact 26 belongs to the first row. For this reason, the group which consists of these contact parts comprises the 2nd triangle, and the direction of the 2nd triangle is opposite to the 1st triangle. The same applies to the sets including other differential transmission signal contact pairs.

  Referring to FIG. 4C, the substrate connection portions of the signal contact 22 and the ground contact 26 are arranged in three rows. For convenience, the upper row in FIG. 4C is referred to as a first row of substrate connection portions, the central row is referred to as a second row of substrate connection portions, and the lower row is referred to as a third row of contact portions. The second row of substrate connection portions is a row of substrate connection portions 29 (29A, 29B) extending from the flat base 27 of the ground contact 26. The first row consisting only of the substrate connecting portions of the signal contacts 22 is offset upward from the second row of the substrate connecting portions as viewed from the first row of the connecting portions. Similarly, the third row including only the substrate connection portion of the signal contact 22 is offset downward from the second row of the substrate connection portion when viewed from the second row of the connection portion. The substrate connection portions 1T and 3T of the differential transmission signal contact pairs 1 and 3 belong to the first column, and the substrate connection portion 29A of the ground contact 26 belongs to the second column. For this reason, a set of these board connection portions constitutes a first triangle (encircled by a broken line). When attention is paid to the differential transmission signal contact pairs 4 and 6, the substrate connecting portions 4T and 6T belong to the third column, and the substrate connecting portion 29A of the ground contact 26 belongs to the second column. For this reason, a set of these board connection portions constitutes a second triangle, the direction of the second triangle is opposite to that of the first triangle, and the first and second triangles are the board connection portions 29A. Share The same applies to the sets including other differential transmission signal contact pairs. Accordingly, since the distance between each differential transmission signal contact and the ground contact constituting the pair is equal over almost the entire length of the differential signal transmission path, the differential signal transmission characteristics are improved.

  In FIG. 4C, the first and second triangles share the same substrate connecting portion 29A (29B), whereas the substrate connecting portion of the ground contact 26 is provided between the signal contacts 13 and 14. Not. As a result, the number of grounding through-holes to be formed on a circuit board (not shown) on which the header 30 is mounted and the wiring pattern of the corresponding circuit board can be reduced, so that the degree of freedom in layout of the wiring pattern is improved. To do.

  FIG. 6 is a perspective view showing a conventional horizontal board-mounted connector (left side) and a vertical board-mounted connector 30 (right side) according to the present invention together with a mating plug 100. The plug 100 is formed with a lock portion 102 protruding from the upper surface (or lower surface) on the upper surface (or lower surface) having a relatively large area. When mounting two board-mounted connectors on a board, it is usual to place two horizontal board-mounted connectors in an up-down direction due to board area constraints. In this case, considering the space required for the operation of the lock unit 102, the total height of the two plugs stacked in the vertical direction may exceed the total height of the notebook PC having the substrate. In contrast, in the case of the vertical board-mounted connector 30 of the present invention, the lock portion 102 is not positioned in the vertical direction of the plug 100. For this reason, even if the connectors 30 are juxtaposed, the width (height) of the plug 100 does not exceed the total height of the notebook PC.

  The preferred embodiment of the present invention has been described above, but the present invention is not intended to be limited to the above-described embodiment, and various modifications and changes can be made as necessary.

  For example, in the above-described embodiment, the board connection portions of the signal contact 22 and the ground contact 26 are through-hole type and are firmly fixed to the board, but a housing or shell is attached to a device such as a notebook PC. In the case where a means for firmly mounting is provided, the substrate connecting portion may be a surface mount type. In the above-described embodiment, the signal contact 22 has the substrate connection portion 25 extending from the rear end of the horizontal base portion 23 downward perpendicular to the base portion 23, but the substrate connection portion 25 is partway through the base portion 23. You may provide the transition part (not shown) which connects diagonally to the middle of. In this case, since the distance between the differential transmission signal contacts constituting the pair changes stepwise, the transmission characteristics are improved.

BRIEF DESCRIPTION OF THE DRAWINGS One Embodiment of the board-mounted connector of this invention is shown, (A) Front view, (B) Right view, (C) Top view, (D) Bottom view. It is a perspective view which shows only a signal contact and a ground contact which remove | excluded the housing and the shell from the board | substrate mounted connector of FIG. It is the perspective view which looked at the model of the contact of FIG. 2 from another direction. 3A is a front view, FIG. 3B is a right side view, and FIG. 3C is a bottom view. It is a perspective view which shows the model of a ground contact. FIG. 6 is a perspective view showing a conventional horizontal board-mounted connector (left side) and a vertical board-mounted connector (right side) of the present invention together with a mating plug.

Explanation of symbols

1, 3, 4, 6, 7, 9, 10, 12, 15, 17 Differential contact signal contacts 2, 5, 8, 11 Ground contact contact portion 26 Ground contact 27 Flat base (ground plate)
29 Ground Contact Board Connection 30 Header (Board Mount Connector)
32 Housing 34 Fitting part

Claims (3)

A housing having a fitting portion and mounted on a circuit board; and a plurality of contact sets including one ground contact and a pair of signal contacts located at an equal distance from the ground contact in the fitting portion. The contact sets adjacent to each other in the fitting portion are alternately arranged so that triangles formed by the ground contacts and the signal contact pairs of the contact sets are opposite to each other, A contact portion of the contact and the signal contact extends substantially parallel to the mounting surface of the circuit board, and a substrate connecting portion of the ground contact and the signal contact extends in a direction orthogonal to the mounting surface of the circuit board. For mounted connectors,
The fitting portion is arranged so that its longitudinal direction extends in a direction orthogonal to the mounting surface of the circuit board,
The board-mounted connector, wherein the contact portions of the plurality of ground contacts extend from a single ground plate disposed between two rows of the signal contacts.   2. The substrate mounting according to claim 1, wherein the contact portion of the ground contact extends offset from the ground plate with respect to the ground plate in each of the two contact rows of the fitting portion. Type connector.   3. The board-mounted connector according to claim 1, wherein the number of the board connection portions of the ground contact is smaller than the number of the contact portions of the ground contact in the fitting portion.

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