JP2003035736A - Apparatus for measuring non-reversible circuit element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for measuring a non-reversible circuit element capable of accurately measuring electrical characteristics without imparting a damage to the non-reversible circuit element. SOLUTION: The apparatus 1 for measuring the non-reversible circuit element generally comprises a measuring circuit board 10, a hermetically sealing sheet 14, a suction pad 21, a metal base 30, input/output coaxial connectors 33, 34, etc. Electrodes 11, 12 are formed on the upper face of the substrate 10. A hole 10a is provided at the central part (in other words, a non-reversible circuit element mounting area) of the substrate 10. The diameter of the hole 10a is set to smaller than that of a suction port of the pad 21. The sheet 14 is arranged on the periphery of the hole 10a. The pad 21 is brought into contact with the lower surface of the substrate 10 so as to cover the hole 10a. The pad 21 is connected to a vacuum pump via an air tube 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring device for nonreciprocal circuit elements such as isolators and circulators used in the microwave band.

[0002]

2. Description of the Related Art Conventionally, there has been known a measuring device for measuring the electrical characteristics of a surface mount type isolator used in a mobile communication device such as a mobile phone. This measuring device measures the electrical characteristics of the isolator in a state where the surface mounting external terminals led out from the isolator body are pressed against the electrode pattern provided on the measurement circuit board. At this time, in the conventional measuring device, the isolator main body is pressed from above with a pressing rod to press the external terminals against the measuring circuit board.

[0003]

However, when the isolator main body is pushed from above by the pressing rod, even if an open failure (electrical connection failure between internal parts) occurs inside the isolator, it will be In some cases, the open position comes into contact with each other due to the force of, and becomes conductive, and the open defect may not be detected. In addition, since the force when pressed is applied to the internal parts, if this pressing force is too strong, problems such as cracking of the internal parts such as permanent magnets and ferrite may occur. Alternatively, if the pressing force is too strong, there is a problem that the electrical connection between the internal parts is destroyed, the external terminal is deformed, and the like.

Therefore, an object of the present invention is to provide a non-reciprocal circuit device measuring apparatus capable of accurately measuring electrical characteristics without damaging the non-reciprocal circuit device.

[0005]

In order to achieve the above object, the non-reciprocal circuit device measuring apparatus according to the present invention comprises:
A non-reciprocal circuit element in which a surface-mounted non-reciprocal circuit element is placed on the surface of a measurement circuit board, and the external terminals derived from the non-reciprocal circuit element body are pressed against the measurement circuit board to measure electrical characteristics. A measuring device, wherein a hole is provided in the non-reciprocal circuit element mounting area of the measuring circuit board, and a suction pad is arranged on the back surface of the measuring circuit board so as to cover the hole. It is characterized by being Alternatively, the suction pad is arranged in the hole.

By sucking air with the suction pad, the nonreciprocal circuit element is sucked toward the measurement circuit board side,
The external terminal of the non-reciprocal circuit element is pressed against the circuit board for measurement,
Electrical measurement is possible. Furthermore, by providing a sealing member around the hole provided on the measurement circuit board to prevent air leakage from the gap between the measurement circuit board and the non-reciprocal circuit element, the non-reciprocal circuit element is surely secured. Suctioned to the measurement circuit board side. Also, the external terminals of the non-reciprocal circuit element and the measurement circuit board may be electrically connected via a conductive rubber material.

Further, since the suction pad has a bellows structure, the suction pad having the bellows structure is temporarily contracted during suction, and the non-reciprocal circuit element adsorbed to the suction pad is moved to the measurement circuit board side. Attracted more. Therefore, the external terminal of the non-reciprocal circuit element is reliably pressed against the measuring circuit board.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a measuring device for a nonreciprocal circuit device according to the present invention will be described below with reference to the accompanying drawings. In each embodiment, the same parts and the same parts are designated by the same reference numerals, and duplicated description will be omitted.

[First Embodiment, FIG. 1 to FIG. 5] As shown in FIG. 1, a measuring apparatus 1 includes a measuring circuit board 10 and a measuring circuit board 10.
Airtight sheet 14, suction pad 21, metal base 3
0, input / output coaxial connectors 33, 34, and the like.

The measurement circuit board 10 is made of, for example, a dielectric material, and has an input electrode 11, an output electrode 12 and a ground electrode 13 (on the upper surface) in conformity with the positions of external terminals of a non-reciprocal circuit device (isolator) described later. 5) is formed. A hole 10a is provided in the central portion of the measurement circuit board 10 (in other words, in the non-reciprocal circuit element mounting area). The diameter of the hole 10a is set smaller than the diameter of the suction port of the suction pad 21.

Further, an airtight sheet 14 is arranged around the hole 10a. The airtight sheet 14 is for preventing air leakage from a gap formed between the measurement circuit board 10 and the bottom surface of the non-reciprocal circuit element when measuring the electrical characteristics of the non-reciprocal circuit element. As a material of the airtight sheet 14, a material having excellent airtightness, flexibility and insulation is adopted, and examples thereof include rubber, fluororesin, and polyimide.

The input electrode 11 and the output electrode 12 are electrically connected to the input / output coaxial connectors 33 and 34 mounted on the left and right of the measuring circuit board 10. The input / output coaxial connectors 33 and 34 are connected to a network analyzer, which is an electrical characteristic measuring instrument, via coaxial cables. The measurement circuit board 10 has a metal base 30.
It is fixed to the upper surface of the by using a method such as screwing.

The suction pad 21 is used for the measurement circuit board 10.
Is abutted on the lower surface of so as to cover the hole 10a. The suction pad 21 is connected to a vacuum pump (not shown) through an air tube 22. When the vacuum pump is operated, the suction pad 21 sucks air. The suction pad 21 has a function of preventing air leakage from the contact portion on the lower surface of the measurement circuit board 10. The suction pad 21 is housed in the metal base 30, and the air tube 2
It is fixed to the metal base 30 via 2. As a material of the suction pad 21, a material having excellent airtightness and flexibility is adopted, and examples thereof include silicone rubber, neoprene rubber, and natural rubber.

Next, a method for measuring the electrical characteristics of the non-reciprocal circuit device using the above-described measuring device 1 will be described.

In the first embodiment, the lumped constant isolator 41 shown in FIGS. 2 to 4 is used as the nonreciprocal circuit device. As shown in FIG. 2, the isolator 41 has a schematic
The metal lower case 44, the resin terminal case 43, the center electrode assembly 53, the metal upper case 48, the permanent magnet 49, the insulating member 47, the resistance element R, and the matching capacitor element C1. ~ C3 etc. are provided.

In the center electrode assembly 53, the center electrodes 61 to 63 are arranged on the upper surface of a rectangular plate-shaped microwave ferrite 60 with a substantially rectangular insulating sheet 66 (indicated by a dotted line) interposed therebetween. The corners are arranged so that the angles are approximately 120 degrees. Each of the center electrodes 61 to 63 has port portions P1 to P3 on one end side thereof, and the ground electrode 65 is connected to the other end side thereof. The ground electrode 65 common to the center electrodes 61 to 63 is provided so as to substantially cover the lower surface of the ferrite 60. The center electrode assembly 53 is made of ferrite 6
The ground electrode 65 formed on the back surface of the metal plate 0 through the window portion 43c of the resin terminal case 43,
It is connected to the bottom wall 44b of the above by a method such as soldering and is grounded.

As shown in FIG. 3, a resin terminal case 43 is provided.
Includes an external input terminal 54 and an external output terminal 5 for surface mounting.
Five and four ground external terminals 56 are insert-molded. One end of each of the external terminals 54 to 56 is led outward from the opposing side wall 43a of the resin terminal case 43, and the other end is exposed at the bottom portion 43b of the resin terminal case 43 and is exposed to the input lead electrode portion 54a. The output lead electrode portion 55a and the ground lead electrode portion 56a are formed (see FIGS. 1 and 6). The input lead electrode portion 54a and the output lead electrode portion 55a are soldered to the port portions P1 and P2, respectively.

In the matching capacitor elements C1 to C3, the hot side capacitor electrodes are soldered to the port parts P1 to P3, respectively, and the cold side capacitor electrodes are respectively connected to the ground lead electrode parts 56a exposed to the resin terminal case 43. It is soldered.

The resistance element R is soldered on the circuit board 58. One of the resistance elements R is connected to the matching capacitor element C via a signal pattern provided on the circuit board 58.
3 is connected to the hot side capacitor electrode, and the other is connected to the ground lead electrode portion 56a exposed at the bottom portion 43b of the resin terminal case 43. That is, the matching capacitor element C3 and the resistance element R are connected to the port portion P of the center electrode 63.
Electrically connected in parallel between 3 and ground.

Then, a metal lower case 44 is mounted from below the resin terminal case 43. The metal lower case 44 is soldered to the ground external terminal 56 that is insert-molded in the resin terminal case 43 (see FIG. 5). A center electrode assembly 53, matching capacitor elements C1 to C3, a resistance element R, and the like are housed in the resin terminal case 43, and a metal upper case 48 is mounted. A permanent magnet 49 is arranged between the metal upper case 48 and the center electrode assembly 53. An insulating member 47 is arranged between the permanent magnet 49 and the matching capacitor elements C1 to C3. The permanent magnet 49 applies a DC magnetic field to the center electrode assembly 53. Metal lower case 4
4 and the metal upper case 48 are joined together to form a metal case, which constitutes a magnetic circuit and also functions as a yoke. In this way, the isolator 41 shown in FIG. 4 is obtained.

Now, as shown in FIG. 1, the isolator 41 is placed on the measuring circuit board 10 by using a carrying device (not shown) or the like. At this time, the external terminals 54, 55, 56 of the isolator 41 are placed on the corresponding electrodes 11, 12, 13 (see FIGS. 1 and 5).

Next, the vacuum pump is operated, and the air in the gap between the bottom surface of the isolator 41 and the measurement circuit board 10 is sucked by the suction pad 21 through the air tube 22. By this air suction, the isolator 41
An atmospheric pressure difference is generated between the bottom surface side and the top surface side of the isolator 41, and a force of 1 atm at maximum is applied to the top surface of the isolator 41. Therefore, the isolator 41 is pulled toward the measurement circuit board 10 side, and the isolator 41 is temporarily fixed. In this way, the external terminals 54 to 56 of the isolator 41 are brought into pressure contact with the electrodes 11, 12, and 13 to surely contact them. Then, the electrical measurement of the isolator 41 is performed while the air is being sucked.

When the electrical measurement of the isolator 41 is completed,
The vacuum pump is stopped, the suction of air is stopped, and the isolator 41 is released. After that, the isolator 41, for which electrical measurement has been completed, is transferred to a tray classified as good or bad by a carrying device or the like.

The measuring device 1 described above has the isolator 41 at atmospheric pressure by suctioning air by the suction pad 21.
Since the upper surface of the isolator 41 is evenly pressed and the isolator 41 is fixed to the measurement circuit board 10, it is not necessary to press the isolator 41 with a pressing rod unlike the conventional measuring device. Therefore, the permanent magnet 49 and the center electrode assembly 53 in the isolator 41 are not damaged. Further, since it is not necessary to press the external terminals 54 to 56 of the isolator 41 with a pressing jig or the like, the external terminals 54 to 56 are not damaged by the pressing jig or the like.

If there is an open defect in the isolator 41, this open defect can be reliably detected. For example, in the area surrounded by the one-dot chain line circle A in FIG.
It is assumed that the port portion P2 and the output lead electrode portion 55a have an open defect due to an insufficient amount of solder 70 (FIG. 1).
See left side of). In this case, the upper surface of the isolator 41 is evenly pressed by the atmospheric pressure, but this atmospheric pressure hardly acts on the inside of the isolator 41. Therefore, the port P2
It is possible to detect an open defect that is not joined to the output extraction electrode portion 55a. On the other hand, when the upper surface of the metal upper case 48 is pressed by the pressing force F using the pressing rod as in the conventional measuring device, the pressing force F, which has a large variation as compared with the atmospheric pressure, is locally generated. To join the port P2
As a result, the port P2 may temporarily come into contact with the output extraction electrode 55a. Therefore, the open defect cannot be detected, and the electrical characteristics cannot be accurately measured.

Further, since the atmospheric pressure of 1 atm at maximum is evenly applied to the upper surface of the isolator 41, there is no fear of damaging the solder joint in the isolator 41. For example, the ground external terminal 56 and the solder 70 of the metal lower case 44
Does not damage the joint (see FIG. 5). However, when the upper surface of the metal upper case 48 is pressed by the pressing force F using the pressing rod as in the conventional measuring device,
The metal lower case 44 may bend due to the pressing force F, and the ground external terminal 56 and the metal lower case 44 may come off at the joint of the solder 70.

Further, since the airtight sheet 14 closes the gap formed between the bottom surface of the isolator 41 and the measurement circuit board 10, the amount of air leaking from between the bottom surface of the isolator 41 and the measurement circuit board 10 is reduced, The isolator 41 can be strongly sucked toward the measurement circuit board 10 side. Therefore, the external terminals 54 to 56 of the isolator 41 are
Since the electrodes can be reliably brought into contact with the electrodes 11 to 13, highly reliable electrical measurement can be performed. In addition,
The airtight sheet 14 does not necessarily have to be provided.

[Second Embodiment, FIG. 6] As shown in FIG. 6, the measuring device 2 includes a suction pad 21 and an isolator 4.
It directly abuts the bottom surface of 1. A hole 10c larger than the diameter of the suction port of the suction pad 21 is provided at the center of the measurement circuit board 10. The suction pad 21 is arranged in the hole 10c, and the suction port is located at the measurement circuit board 1.
0 is slightly projected from the upper surface.

In the above measuring apparatus 2, since the suction pad 21 directly adsorbs the bottom surface of the isolator 41, air leakage is almost eliminated. Therefore, the external terminals 54 to 56 of the isolator 41 are connected to the electrodes 11 to 1 of the measurement circuit board 10.
Since it can be reliably brought into contact with 3, it is possible to perform highly reliable electrical measurement.

[Third Embodiment, FIG. 7] As shown in FIG. 7, the measuring apparatus 3 is the suction pad 2 of the second embodiment.
Instead of 1, a suction pad 21A having a bellows structure that can expand and contract is used. Hole 1 for suction pad 21A
0c, and its suction port slightly projects from the upper surface of the measurement circuit board 10.

Therefore, the suction port of the suction pad 21A is surely adsorbed to the bottom surface of the isolator 41. Further, at the moment of suction, the suction pad 21A having a bellows structure contracts downward due to suction, and the isolator 41 sucked by the suction pad 21A is drawn toward the measurement circuit board 10 side. Thus, the external terminal 5 of the isolator 41
Since 4 to 56 can surely contact the electrodes 11 to 13 of the measurement circuit board 10, highly reliable electrical measurement can be performed.

[Fourth Embodiment, FIG. 8] As shown in FIG. 8, the measuring apparatus 4 includes electrodes 11 to 1 of the measuring circuit board 10.
3 and the external terminals 54 to 56 of the isolator 41 are electrically and surely connected via the conductive rubber material 24. The conductive rubber material 24 is arranged around the holes 10a and 10b provided in the center of the measuring circuit board 10. For the conductive rubber material 24, an anisotropic conductive rubber that is conductive in the thickness direction of the rubber material 24 but is non-conductive in the horizontal direction is used. Alternatively, the electrodes 11 to 1 of the measurement circuit board 10
A composite conductive rubber material may be used in which a normal conductive rubber is used only in the portion corresponding to 3 and an insulating rubber is used in the other portions. As a result, highly reliable electrical measurement can be performed. In addition, this conductive rubber material 2
Reference numeral 4 closes the gap formed between the bottom surface of the isolator 41 and the measurement circuit board 10, and has the same function as the airtight sheet 14 of the first embodiment.

Further, the measuring device 4 is provided with a plurality of small diameter holes 10b around the hole 10a. This allows
The total area of holes for sucking the isolator 41 increases,
The force of sucking the isolator 41 becomes strong. Therefore,
Since the external terminals 54 to 56 of the isolator 41 can be reliably brought into contact with the electrodes 11 to 13 of the measurement circuit board 10, highly reliable electrical measurement can be performed.

The present invention is not limited to the above embodiment, but can be modified into various configurations within the scope of the gist of the present invention.

[0035]

As is apparent from the above description, according to the present invention, the non-reciprocal circuit element is attracted to the measurement circuit board side by sucking the air with the suction pad, and the non-reciprocal circuit element is exposed to the outside. Since the terminals are brought into contact with the measuring circuit board, it is not necessary to press the nonreciprocal circuit element from above with a pressing rod unlike the conventional measuring device. In other words, the external force such as the pressing force hardly acts on the inside of the non-reciprocal circuit element, and the open defect in the non-reciprocal circuit element is temporarily contacted,
No more worrying about damaging internal parts. As a result, it is possible to obtain a non-reciprocal circuit device measuring apparatus capable of accurately measuring electrical characteristics without damaging the non-reciprocal circuit device.

[Brief description of drawings]

FIG. 1 shows a first measuring device for a non-reciprocal circuit device according to the present invention.
The vertical sectional view showing an embodiment.

FIG. 2 is an exploded perspective view showing an example of a non-reciprocal circuit device.

3 is an internal plan view of the nonreciprocal circuit device shown in FIG.

4 is an external perspective view of the nonreciprocal circuit device shown in FIG.

FIG. 5 is a vertical cross-sectional view for explaining a function and effect of the non-reciprocal circuit device measuring apparatus according to the present invention.

FIG. 6 shows a second measuring device for a non-reciprocal circuit device according to the present invention.
The vertical sectional view showing an embodiment.

FIG. 7 is a third diagram of the non-reciprocal circuit device measuring apparatus according to the present invention.
The vertical sectional view showing an embodiment.

FIG. 8 is a fourth embodiment of the non-reciprocal circuit device measuring apparatus according to the present invention.
The vertical sectional view showing an embodiment.

[Explanation of symbols]

1, 2, 3, 4 ... Measuring device 10 ... Circuit board for measurement 10a, 10b, 10c ... holes 11, 12, 13 ... Electrodes 14 ... Airtight sheet (sealing member) 21,21A ... Suction pad 24 ... Conductive rubber material

Claims (5)

[Claims] 1. A surface mount type non-reciprocal circuit device is placed on the surface of a measurement circuit board, and external terminals led out from the non-reciprocal circuit device body are pressed against the measurement circuit board to measure electrical characteristics. In the non-reciprocal circuit element measuring device, a hole is provided in the non-reciprocal circuit element mounting area of the measurement circuit board, and a suction pad is arranged on the back surface of the measurement circuit board so as to cover the hole. A measuring device for a non-reciprocal circuit element, which is provided. 2. A sealing member for preventing air leakage from a gap between the measurement circuit board and the non-reciprocal circuit element is provided around a hole provided in the measurement circuit board. The non-reciprocal circuit device measuring apparatus according to claim 1. 3. A conductive rubber material is arranged at a predetermined position on the surface of the measuring circuit board, and the measuring circuit board is electrically connected to an external terminal of the non-reciprocal circuit element through the conductive rubber material. 3. The method according to claim 1 or 2, wherein the connection is made in a fixed manner.
The measuring device for a non-reciprocal circuit device as described in 1. 4. A surface mount type non-reciprocal circuit element is placed on the surface of a measuring circuit board, and external terminals led out from the non-reciprocal circuit element body are pressed against the measuring circuit board to measure electrical characteristics. In the non-reciprocal circuit device measuring apparatus, a hole is provided in the non-reciprocal circuit device mounting area of the measurement circuit board, and a suction pad is provided in the hole. Device measuring device. 5. The non-reciprocal circuit device measuring apparatus according to claim 4, wherein the suction pad has a bellows structure.