KR100326519B1 - Coaxial cable unit, cable terminal and fixture board - Google Patents

Abstract

In order to provide a fixed plate that has a strong connection between the coaxial cable and the circuit board and does not require a jig or screw to connect to the circuit board, a socket plate having a socket of a semiconductor device or a performance plate connected to a test device for testing a semiconductor device A plurality of coaxial cable units are provided for connecting the socket and the performance plate. The coaxial cable unit is provided at a suitable distance from the ground layer, a signal line surrounded by the ground layer, a coaxial cable having at least one end portion, a cable terminal having an enclosure surrounding the ground layer outer periphery in the distal end of the coaxial cable, and a signal line. And a fixing portion extending in the axial direction of the coaxial cable and electrically connected to the enclosure.

Description

Coaxial Cable Units, Cable Terminals and Fixing Plates {COAXIAL CABLE UNIT, CABLE TERMINAL AND FIXTURE BOARD}

This patent application claims priority to Japanese Patent Application No. 99-34740, filed February 12, 1999, which was incorporated as part of the present invention with reference to the above contents.

The present invention relates to a cable terminal, a coaxial cable unit using a cable terminal, and a fixture board using a coaxial cable. The stationary plate is often called Hi-Fix. More specifically, the present invention relates to a cable terminal, a coaxial cable, and a fixed plate through which an input signal can be transmitted accurately.

In the conventional coaxial cable, a ground portion and a signal line portion are soldered onto a wiring pattern of a circuit board, respectively, and are installed on the circuit board. Alternatively, a jig for screwing the ground portion and the signal line portion, respectively, is screwed onto the circuit board and then screwed onto the jig by screwing the coaxial cable onto the jig.

However, according to the conventional soldering method, there is a problem that the coaxial cable is easily broken when the coaxial cable is pulled out because the connection strength between the coaxial cable and the circuit board is weak. In addition, when using the jig, the cost for the jig and the cost of screwing the coaxial cable on the jig additionally occurs, there is another problem that the production cost using the coaxial cable increases.

In addition, for example, a high speed signal must be transmitted very precisely to a semiconductor test apparatus used for testing a semiconductor device. Therefore, it is desirable that the coaxial cable used to transmit such a signal is not tolerated in the coaxial cable, the line impedance must be constant at all times, and the stray capacitance is low. However, in the conventional method, the stray capacitance can be easily large because the area where the coaxial cable is installed on the circuit board is large. In addition, since the signal line in the installation portion is not covered, noise can easily come in from the outside.

Accordingly, it is an object of the present invention to provide a cable terminal, a coaxial cable unit, and a fixing plate which can solve the above problems. This object is achieved by the combination disclosed in the independent claim. The dependent claims define another preferred and exemplary combination of the invention.

In a first preferred embodiment, a socket board in which a socket of a semiconductor device is installed, a performance board connected to a testing apparatus for testing the semiconductor device, and a socket plate and a performance plate are connected. A fixing plate including a plurality of coaxial cable units is provided. The coaxial cable unit comprises a coaxial cable having a ground layer, a signal line surrounded by the ground layer, and at least one end portion, and a cable having an enclosure surrounding the ground layer outer periphery in the distal end of the coaxial cable. And a fitting part electrically connected to the enclosure and extending in the axial direction of the coaxial cable at an appropriate distance from the signal line.

In a second preferred embodiment, the cable terminal further comprises a shoulder part connected to the enclosure and extending radially of the coaxial cable. The fixing portion is connected to the shoulder portion and extends axially from the shoulder portion. Preferably, the maximum width of the fixing portion is different from the diameter of the signal line. In addition, the enclosure preferably surrounds at least three quarters of the entire outer circumference of the coaxial cable. It is preferable that the axially upper position of the fixing portion becomes substantially the same as the coaxial upper position of the signal line.

The foregoing summary of the present invention does not divide all of the necessary features of the present invention into items, and sub-combinations of these features may also be included in the present invention.

The invention will be more fully understood from the following detailed description, which is disclosed with reference to the accompanying drawings.

1 is a front view of a fixing plate according to an aspect of the present invention.

2 (A) to 2 (C) are side views in three directions showing details of the structure of the coaxial cable unit 20 illustrated in FIG. 1.

3A to 3C are side views in three directions showing in detail the structure of the cable terminals 40 illustrated in FIGS. 2A to 2C.

Next, the present invention will be described with reference to preferred embodiments. These examples are illustrative only and not intended to limit the scope of the invention. Not all of the features and combinations disclosed in the examples are necessarily essential to the invention.

1 is a front view of a fixing plate according to an embodiment of the present invention. The fixed plate includes a socket plate 10 having a socket 70 of the semiconductor device 90 installed therein, a performance plate 30 connected to the test device main body 80 for testing the semiconductor device 90, and a socket plate 10. It includes a plurality of coaxial cable unit 20 for connecting the performance plate (30).

The socket plate 10 is provided with a through hole 14 for inserting and soldering a signal line of the coaxial cable unit 20 and a through hole 16 for connecting to a ground line of the coaxial cable unit 20. The performance plate 30 is provided with a through hole 34 for inserting and soldering a signal line of the coaxial cable unit 20 and a through hole 36 for connecting to a ground line of the coaxial cable unit 20. The through holes 36 of the socket plate 10 and the performance plate 30 are connected to ground the patterns provided in the socket plate 10 and the performance plate 30, respectively.

The high speed signal is transmitted from the test apparatus main body 80 to the performance plate 30 to test the semiconductor device 90. The test signal transmitted from the test apparatus main body 80 to the performance plate 30 is provided to the socket wiring pattern 12 formed on the socket plate through the coaxial cable unit 20 and the socket plate 10. In the same way, when testing the semiconductor device 90, the output signal output from the semiconductor device 90 is transmitted through the socket 70, the socket plate 10, the coaxial cable unit 20, and the performance plate 30. The test device main body 80 is provided.

In order to accurately test the semiconductor device 90, it is desirable that the external noise disturbing the test signal be negligible. In addition, in order to prevent reflection or edge rounding of the test signal, the characteristic impedance on the test signal transmission line is always constant, and the stray capacitance on the transmission line is preferably as low as possible.

2 (A) to 2 (C) are side views in three directions showing the structure of the coaxial cable unit 20 illustrated in FIG. 1 in detail. The coaxial cable unit 20 includes a coaxial cable 60 and a cable terminal 40. The coaxial cable 60 includes a ground layer 66, a ground leader line 64 guided from the ground layer 66, a signal line 62 surrounded by the ground layer 66, and at least one end portion ( 68).

The cable terminal 40 and the ground layer 66 of the coaxial cable 60 are soldered together to the distal end 68 of the coaxial cable 60. In addition, the ground leader wire 64 and the cable terminal 40 are folded together in the outward direction of the cable terminal 40 and soldered together. An insulation layer is provided between the ground layer 66 and the signal line 62. At the distal end, an insulating layer protrudes upward of the coaxial cable unit 20. 2 (B) and 2 (C), the cable terminal 40 is provided at the two end portions 68 of the coaxial cable 60, but as a further embodiment the cable terminal 40 has a distal end portion 68. It can only be installed on one of them.

3A to 3C are side views in three directions showing in detail the cable terminals 40 illustrated in FIGS. 2A to 2C. The cable terminal 40 is an axial direction of the coaxial cable 60 at an appropriate distance from the enclosure 42 surrounding the ground layer 66 of the coaxial cable 60 and the signal line 62 of the coaxial cable 60. And a fixture 46 extending electrically to and electrically insulated from the enclosure 42. The socket plate 10 is provided with a through hole 14 for inserting and soldering a signal line 62 and a through hole 16 for inserting and soldering a fixing portion 46. The performance plate 30 is provided with a through hole 34 for inserting and soldering a signal line 62 and a through hole 36 for inserting and soldering a fixing portion 46.

Since the enclosure 42 surrounds the outer circumference of the coaxial cable 60 or more by three quarters or more, the coaxial cable 60 and the cable terminal 40 are electrically and firmly contacted with each other so that the impedance change of the connection portion can be suppressed. have. Since the outer circumferential length of the enclosure 42 is shorter than the length necessary to cover the entire outer circumference of the ground layer 66, a gap 52 is formed between both ends of the enclosure 42. Thus, the solder can easily flow out of the gap 52 so that the cable terminal 40 and the coaxial cable 60 can be soldered together.

For the same reason as above, the cable terminal 40 and the coaxial cable 60 are not only electrically rigidly connected, but also mechanical strength can be improved. A shoulder portion 44 connected to the enclosure 42 and extending radially is provided to the cable terminal 40. Since the fixing portion 46 is connected to the shoulder portion 44 and extends in the axial direction from the shoulder portion 44, an appropriate distance can be maintained between the fixing portion 46 and the signal line 62. Thus, the signal line 62 and the enclosure 42 can be accurately contacted.

Since a cut-out portion 48 is provided on the side of the fixing portion 46 in the axial direction of the enclosure 42, the ground leader wire 64 can be folded outward from the inside of the enclosure 42. When folded, the folded portion does not protrude from the cutout 48. Therefore, since the cable terminal 40 can be in contact with the socket plate 30 and the performance plate 30, the strength that the cable terminal 40 is connected to the socket plate 10 and the performance plate 30 can be improved. Can also reduce the connection impedance.

In order to prevent the cable terminal 40 from short-circuiting with other cables and to improve the adhesive strength, the cable terminal 40 and the distal end 68 of the coaxial cable 60 are connected to an end tube (not shown). It is preferable to coat | cover by. Since a small protrusion 50 is provided at the distal end opposite the fixing portion 46 in the axial direction of the enclosure 42, the end covering the distal end 68 of the cable terminal 40 and the coaxial cable 60. The tube can be prevented from moving. Therefore, exposure of the cable terminal 40 can be prevented.

Since the signal line 62 is inserted into the through holes 14 and 34 provided in the socket plate 10 and the performance plate 30, the exposed portion of the signal line 62 is considerably less. Thus, outside noise can be prevented from entering the signal line 62. The ground layer 66 of the coaxial cable 60 is connected to the ground layer of the performance plate 30 and the socket plate 10 in the region close to the signal line 62. Therefore, the signal line impedance of the connection portion between the coaxial cable 60, the socket plate 10, and the performance plate 30 can be suppressed and maintained low, and the signal line reflection in the connection portion can also be suppressed.

In addition, since the cable terminal 40 can be soldered to the connection portion between the socket plate 10 and the coaxial cable 60 and the connection portion between the performance plate 30 and the coaxial cable 60, the socket plate 10, The strength of the connection between the performance plate 30 and the coaxial cable 60 can be increased. In addition, since the signal line 62 and the ground layer 66 are soldered together to the plate by using the through-holes, the soldering strength is increased than when soldering to the surface of the plate. In addition, the solder area can be reduced, so that the stray capacitance of the signal line can be reduced.

When the maximum width of the fixing part 46 is approximately equal to the diameter of the signal line 62, the size of the through holes 14 and 34 of the signal line 62 is the fixing part 46 of the socket plate 10 and the performance plate 30. It is desirable that the size of the through hole 16 and 36 be approximately equal to that of the through hole 16). However, when the size of the through holes 14 and 34 of the signal line 62 is almost the same as the size of the through holes 16 and 36 of the fixing part 46, the signal lines 62 and the fixing part 46 are inaccurate through holes. There is a possibility to be inserted into each.

In order to prevent this, the diameter of the signal line 62 is different from the width of the fixing part 46, and the inner diameters of the through holes 14 and 34 for the signal line 62 are used as the through holes for the fixing part 46 16 and 36).

The signal line 62 and the fixing portion 46 inserted into the socket plate 10 or the performance plate 30 protrude through the rear sides of the socket plate 10 and the performance plate 30. In order to prevent the protruding fixing portion 46 and the signal line 62 from contacting each other, it is preferable to shorten the length protruding to the rear side. Therefore, the position of the upper side of the fixing part 46 in the horizontal direction of the coaxial cable 60 is substantially the same as the upper position of the signal line 62 in advance.

The present invention has been disclosed by way of preferred embodiments. The scope of the above description is not limited to the scope of the preferred embodiment. It is apparent that those skilled in the art can make various modifications or improvements to the preferred embodiments. It is clearly understood from the claims that embodiments which add such modifications and improvements fall within the scope of the present invention.

As described above, according to the present invention, it is possible to provide a fixing unit using a cable unit, a coaxial cable unit, and a cable terminal having a strong connection strength between a coaxial cable and a circuit board and requiring no jig or screw. In addition, according to an embodiment of the present invention, there is provided a fixed plate and a coaxial cable unit in which noise cannot easily come in and the stray capacitance on the signal line and the connection impedance between the coaxial cable and the circuit board are small.

Claims (17)

A coaxial cable comprising at least one end having a ground layer and a signal line surrounded by the ground layer, A cable terminal comprising an enclosure surrounding the ground layer outer periphery in the distal end of the coaxial cable, and A fixing part electrically connected to the enclosure and extending in the axial direction of the coaxial cable at an appropriate distance from the signal line Coaxial cable unit for signal transmission comprising a. 2. The cable terminal of claim 1, wherein the cable terminal further comprises a shoulder portion connected to the enclosure and extending radially of the coaxial cable from the enclosure, wherein the fixing portion is connected to the shoulder portion and the shaft portion from the shoulder portion. Coaxial cable unit extending in the direction. The coaxial cable unit according to claim 1, wherein a maximum width of the fixing part is different from a diameter of the signal line. The coaxial cable unit according to claim 1, wherein the enclosure surrounds at least three quarters of the entire outer circumference of the coaxial cable. The coaxial cable unit according to claim 1, wherein an axial upper end position of the fixing part is substantially the same as an axial upper end position of the signal line. The coaxial cable unit of claim 1, further comprising an insulating layer between the ground layer and the signal line, wherein the insulating layer protrudes upward from the ground layer of the distal end of the coaxial cable unit. The coaxial cable unit of claim 1, wherein the coaxial cable includes two end portions, and the cable terminal is provided at each of the two end portions. A cable terminal in which an end portion having a ground layer and a signal line surrounded by the ground layer is provided on a circuit board, An enclosure having a suitable length surrounding the outer periphery of the ground layer, and A fixing part electrically connected to the enclosure and extending in the axial direction of the coaxial cable at an appropriate distance from the signal line when the enclosure surrounds the outer circumference of the ground layer Cable terminal comprising a. The cable terminal of claim 8, wherein a shoulder portion is connected to the enclosure and extends in a radial direction of the coaxial cable, and the fixing portion is connected to the shoulder portion and extends in an axial direction from the shoulder portion. The cable terminal according to claim 8, wherein a maximum width of the fixing part is different from a diameter of the signal line. The cable terminal according to claim 8, wherein an outer circumferential length of the coaxial cable is shorter than an outer circumferential length of the ground layer. Socket plate in which the socket of the semiconductor device is installed, A performance plate connected to a test device for testing the semiconductor device, and A plurality of coaxial cable units connecting the socket plate and the performance plate Including, The coaxial cable unit may include a coaxial cable having a ground layer, a signal line surrounded by the ground layer, and at least one end portion; A cable terminal having an enclosure surrounding the ground layer outer periphery in the distal end of the coaxial cable; And a fixing part electrically connected to the enclosure and extending in the axial direction of the coaxial cable at an appropriate distance from the signal line. Fixing plate. 13. The fixed plate of claim 12, wherein the cable terminal further comprises a shoulder portion connected to the enclosure and extending in a radial direction of the coaxial cable, wherein the fixing portion is connected to the shoulder portion and extends axially from the shoulder portion. . The fixing plate according to claim 12, wherein a maximum width of the fixing portion is different from a diameter of the signal line. The fixed plate according to claim 12, wherein the enclosure surrounds at least three quarters of the entire outer circumference of the coaxial cable. The fixing plate according to claim 12, wherein an axially upper position of the fixing part is substantially the same as a coaxial upper position of the signal line. The fixing plate of claim 12, further comprising an insulating layer between the ground layer and the signal line, wherein the insulating layer protrudes upward from the ground layer of the distal end of the coaxial cable unit.