JPH04230969A - Connector for coaxial flat cable - Google Patents

Abstract

PURPOSE:To reduce the cross talk quantity and improve the transmission characteristic by dividing the contact section side arrangement of a contact into upper and lower stages connected to coaxial cables in the odd order and coaxial cables in the even order. CONSTITUTION:A signal wire S connected to the center conductor of a coaxial cable and a ground wire G connected to the outer conductor are regularly and repeatedly arranged in the order of the number of coaxial cables connected to contact sections 3-3 of a contact 3 connected to the coaxial cables in the odd order at the upper stage. A signal wire S and a ground wire G are regularly and repeatedly arranged in the order of the number of coaxial cables connected to contact sections of a contact connected to the coaxial cables in the even order at the lower stage. The signal wire S and ground wire G different from each other are arranged at corresponding upper and lower positions of the upper and lower stages.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a coaxial flat cable connector used in electronic equipment, and particularly to a connector with a small amount of crosstalk.

[Conventional technology]

BACKGROUND OF THE INVENTION With the development of electronic technology, the power flowing through electronic circuits has become lower in voltage and current, and has become higher in frequency.

Under these circumstances, small-diameter coaxial cables have come to be widely adopted for connections between circuit boards within electronic devices or between electronic devices.

So-called small-diameter coaxial cables, for example, which have a center conductor diameter of 0.1 to 0.5 mm and an outer conductor diameter of 0.5 to 0.8 mm, are used to connect circuit boards in electronic devices or between electronic devices. A flat cable is used in which multiple cables are lined up in one plane and a sheath is applied to the outside.When this flat cable is used to connect circuit boards or devices, the board or device and the flat cable are connected to a coaxial flat cable. Connected via a connector for

FIG. 1 shows a typical example of this type of connector. In FIG. 1, 1 is a circuit board, and 2 is a receptacle type connector attached to the circuit board.

Reference numeral 5 denotes the body of a plug-type connector that fits into the receptacle-type connector of the board (1). 3 is a contact of a plug-type connector (5), and only its connection part (3-1) is exposed. The connection portions (3) are arranged in parallel on one plane in consideration of connection with the flat cable. 8 is a flat cable in which a plurality of coaxial cables (7) are arranged in one plane and a sheath is applied to the outside thereof.

FIG. 2 is a perspective view showing the arrangement of a plurality of contacts attached to the plug-type connector (5) shown in FIG. 1. In Figure 2, 3 is a plug type connector (5
), and these contacts (3) each have a connection part (3-1), a fixed part that is firmly maintained on the body of the connector, and a contact part that makes contact with the contacts of the mating receptacle type connector. It consists of three parts.

In FIG. 2 [I], the symbol "S" attached to each contact represents a signal contact, and the symbol "G" represents a ground contact. Further, the numbers attached to each contact represent the order, and correspond to the horizontal order of the coaxial cable of the flat cable. For example, the connection part S1 is the center conductor of the first coaxial cable of the flat cable, and the connection part S2 is the center conductor of the first coaxial cable of the flat cable.
The connection part G1 is connected to the center conductor of the first coaxial cable, and the connection part G1 is connected to the outer conductor of the first coaxial cable.
is connected to the outer conductor of the No. 2 coaxial cable.

The arrangement of contacts in conventional connectors is
3-1), as shown in (a) of Figure 2 [II], the coaxial cables are arranged in the order of G1, S1, G2, S2, etc. on one plane, and the ground and signal cables are regularly paralleled. Arranged in In addition, the contact part (3-3) is shown in Fig. 2 [II]
As shown in (b), the coaxial cables are divided into two stages, upper and lower, with the signal contact part (3-3) in the upper stage and the ground contact part in the lower stage, in the order of the coaxial cables to be connected. arranged in parallel.

For example, coaxial cables that use coaxial cables to connect between boards in electronic devices or between electronic devices have a crosstalk of about 50 % (6dB).

[Problem to be solved by the invention]

However, with the recent development of electronic technology, in the current situation where even higher speeds and multiplexing are required, further reduction of crosstalk is required.

The present invention has been made in view of the current situation, and an object of the present invention is to provide a connector that reduces the amount of crosstalk and improves electrical transmission characteristics without changing the arrangement on the connection side of the contacts.

[Means to solve the problem]

The above object can be achieved by arranging the contact portion of the contact so as to satisfy the following conditions.

In the upper row of the contact part side array, the contact parts of the contacts connected to the center conductor of the odd-numbered coaxial cable and the contact parts of the contacts connected to the outer conductor are arranged in numerical order, and the signals,
In addition, in the lower row, the contact parts of the contacts connected to the center conductor of the even-numbered coaxial cables and the contact parts of the contacts connected to the outer conductor are arranged in numerical order and the signals are arranged in a regular repeating order. , arranged in a regular repeating order of the grounds.

[Effect]

By simply dividing the arrangement of the contacts on the contact part side into two levels, upper and lower, ie those connected to the odd-numbered coaxial cables and those connected to the even-numbered coaxial cables, the arrangement shown in Figures 2 [I] and [I]
I] Compared to the conventional ones shown in (a) and (b), the amount of crosstalk is reduced by about 10 dB.

However, the reason why the amount of crosstalk is reduced in this way has not been fully elucidated.

〔Example〕

The present invention will be explained below based on the drawings.

FIG. 3 [I] is a perspective view showing a contact arrangement in one embodiment of the connector according to the present invention.

In Fig. 3 [I], each contact (3) constituting the contact array consists of three parts: a connection part (3-1), a fixing part (3-2), and a contact part (3-3). There is. Note that the signal S attached to each contact is for signal use, and the signal G for each contact is for ground use. Further, the numbers represent the order, and correspond to the order of the coaxial cables forming the connected flat cable.

Figure 3 [II] (a) shows the arrangement of the connection parts shown in Figure 3 [I] when viewed from the connection part side, and Figure 3 [II] (b) shows the contact arrangement shown in Figure 3 [I]. This is the arrangement of the contact parts as seen from the side.

As shown in FIG. 3 [II] (a), the arrangement on the connection side is the same as the conventional arrangement shown in FIG. 2 [I] and FIG. 2 [II] (a).

However, as can be seen from (b) in Figure 3 [II], the arrangement on the contact part side is such that the contact part (3-3) of the contact (3) connected to the odd-numbered coaxial cable is in the upper row. The coaxial cables are arranged in numerical order of the connected coaxial cables, and the signal cables connected to the center conductor of the coaxial cables and the ground cables connected to the outer conductor of the coaxial cables are arranged in regular repetition.

Also, in the lower row, the contact parts of the contacts (3) connected to even-numbered coaxial cables are arranged in the numerical order of the connected coaxial cables, as in the upper row, and the signal and ground contacts are regularly repeated. are arranged in

In the upper and lower positions of the upper and lower stages, mutually different signal and ground terminals are arranged.

Note that with the above contact arrangement, empty seats will be created at the end of the upper tier and the opposite end of the lower tier. Contacts are not necessarily placed in these vacant seats, but in the case of FIG. 3, unconnected contacts are placed as a preliminary arrangement.

FIG. 4 shows the results of measuring the amount of crosstalk of the connector according to the present invention and comparing it with the conventional connector.

In FIG. 4, curve I represents the amount of crosstalk of the connector according to the present invention, and curve II represents the amount of crosstalk of the conventional connector.

Note that the horizontal axis represents the rise time.
The vertical axis represents crosstalk (dB).

〔Effect of the invention〕

By adopting the contact arrangement described above, the connector according to the present invention can reduce the amount of crosstalk by 10 dB or more in the entire rise time period, as shown in FIG. 4, compared to the conventional connector. It has excellent transmission characteristics.

In addition, the connector according to the present invention has the connection portions arranged in parallel on one plane, and the signal connection connected to the center conductor and the ground connection connected to the external conductor are regularly and repeatedly arranged, so that connection with a coaxial flat cable is possible. The work is extremely easy;
This has the remarkable effect of providing a more reliable connection state.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional connector, Fig. 2 [I] is a contact arrangement diagram of a conventional connector, and Fig. 2 [II] (a) is an arrangement diagram of a connection part of a conventional contact. FIG. 2 [II] (b) is an arrangement diagram of the contact portions of a conventional contact. FIG. 3 [I] is a contact arrangement diagram of the connector of the present invention, FIG. 3 [II] (a) is an arrangement diagram of the connection part of the contact of the present invention, and FIG. 3 [II] (b) FIG. 2 is an arrangement diagram of the contact portions of the contact of the present invention. Further, FIG. 4 is a diagram showing the measurement results of the amount of crosstalk of the connector of the present invention. DESCRIPTION OF SYMBOLS 1...Circuit board, 2...Receptacle type connector, 3...Contact, 5...Plug type connector body, 7...Coaxial cable, 8...Flat cable.

Claims (1)

[Scope of Claims] A plurality of pairs of two contacts of the same shape for signal and ground, each consisting of a connection part, a fixing part, and a contact part, and an insulating contact member for holding and fixing the contacts. A coaxial flat cable connector consisting of a body, wherein the connection portions of the contacts are arranged in a row on one plane in the order of signal use, ground use, or vice versa for each pair, and the contact portions of the contacts are They are divided into two levels, upper and lower. In the upper level, a pair of odd-numbered signal and ground contacts are arranged in the order of signal and ground, or vice versa, and in the lower level, an even-numbered pair of signal and ground contacts are arranged. contacts are arranged in the order of signal and ground, or vice versa, and in the corresponding positions of the upper and lower rows, signal contacts and ground contacts, or ground contacts and signal contacts are arranged relative to each other. A connector for coaxial flat cables arranged as follows.