JP3914479B2 - Jig for measuring frequency characteristics of chip capacitors - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a jig for measuring frequency characteristics of a chip capacitor, and more particularly to a jig for measuring frequency characteristics of a chip capacitor with improved measurement accuracy and convenience.
[0002]
[Prior art]
There is known a network analyzer capable of displaying frequency characteristics such as a capacitance of a chip capacitor and a resonance point with a decibel value. When measuring the frequency characteristics of the capacitor using such a network analyzer, as shown in FIG. 4, a chip capacitor C to be measured is connected in parallel between the core wire 5a 'and the ground wire 5c', and the output The input / output terminals of the network analyzer are connected to the terminal Tx5 and the input terminal Rx5, respectively. Then, a test signal f1 is given to the chip capacitor C, and frequency characteristics such as the capacitance and resonance point of the chip capacitor are measured based on the output signal.
[0003]
However, a jig for measuring the frequency characteristic of a chip capacitor using a network analyzer is not currently sold, and the frequency characteristic is usually measured by a method as shown in FIG. FIG. 5A relates to a first conventional measurement method, and FIG. 5B relates to a second conventional measurement method.
[0004]
That is, as shown in FIG. 5A, in the first conventional measurement method, the coaxial line 5 connected to the input / output terminal of the network analyzer is connected to the ground line pattern 5c1 formed on the substrate 8 and The signal line pattern 5a1 is connected via the input / output connectors 7a and 7b. Then, the chip capacitor C to be measured is soldered in parallel between the ground line pattern 5c1 and the signal line pattern 5a1 by P3. The length L of the ground line pattern 5c1 and the signal line pattern 5a1 is usually 30 mm to 50 mm.
[0005]
Further, as shown in FIG. 5B, in the second conventional measurement method, a direct connection between the ground line 5c and the core line 5a of the coaxial line 5 respectively connected to the input / output terminals of the network analyzer. The chip capacitor C to be measured is soldered in parallel and joined by P4. In the figure, 5b and 5d indicate the insulating inner skin and the insulating outer skin of the coaxial line 5, respectively. Note that an equivalent circuit of the method of FIGS. 5A and 5B at the time of measurement is the same as that of FIG.
[0006]
[Problems to be solved by the invention]
However, the first conventional measuring method has a problem that the frequency characteristics such as the resonance point of the capacitor C cannot be accurately measured due to the inductance from the coaxial line 5 to the chip capacitor C. Further, when different capacitors C are continuously measured, it is necessary to repeat soldering and desoldering. In the process, the substrate 8, the patterns 5a1, 5c1, and the capacitor C are likely to be damaged. .
[0007]
In the second conventional measuring method, although the influence of the inductance from the coaxial line 5 to the chip capacitor C is reduced, for the fine soldering work between the chip capacitor C, the ground wire 5c, and the core wire 5a. Technical difficulty is high and skill is required. Also, it took a lot of time to set up the measurement. Furthermore, as in the first conventional measuring method, when different capacitors C are measured continuously, soldering and unsoldering must be repeated, and in the process, the coaxial line 5 and the capacitor C are damaged. There was a high possibility of doing.
[0008]
Therefore, in view of the present situation described above, the present invention is for frequency characteristic measurement that enhances the convenience of frequency measurement without damaging the capacitor to be measured or the measurement jig while promoting the reduction of inductance and improving the measurement accuracy. The problem is to provide a jig.
[0009]
[Means for Solving the Problems]
The frequency characteristic measuring jig according to claim 1, which has been made to solve the above-described problems, is formed by bonding the ground lines included in the wire connected to the input / output terminals of the analyzer capable of measuring the frequency characteristic of the chip capacitor. A ground wire side contact portion that is in electrical contact with one end of the chip capacitor, a fixed conductor plate to which a core wire included in the wire is joined, and a through hole formed in the fixed conductor plate, A movable conductor plate that is in sliding contact with the fixed conductor plate, a core wire side contact portion that is a part of the movable conductor plate and that is in electrical contact with the other end of the chip capacitor, and a slide formed on the movable conductor plate In order to sandwich the chip capacitor between the hole, the ground wire side contact portion, and the core wire side contact portion, the movable conductor plate is fixedly guided using the through hole and the slide hole. Characterized in that it comprises fixing a member securable to the plate, the.
[0010]
According to the first aspect of the present invention, after the movable conductor plate is slid and the chip capacitor is disposed between the ground wire side contact portion and the core wire side contact portion, the chip capacitor can be held by the fixing member. . Therefore, it is not necessary to solder the chip capacitor for each measurement. Also, skill is not required for setting up to measurement.
[0011]
The frequency characteristic measuring jig according to claim 2, which has been made to solve the above-described problem, is the frequency characteristic measuring jig according to claim 1, wherein the wire is opposite to a side connected to the network analyzer. The end portions are closely attached to each other in parallel, and the ground wires exposed from the end portions are soldered to each other.
[0012]
According to the second aspect of the present invention, the end of the wire opposite to the side connected to the network analyzer is in close contact with each other, and the ground wires exposed from the end are soldered to each other. In addition, since the ground line side contact portion is formed, inductance due to the substrate pattern does not occur.
[0013]
The frequency characteristic measuring jig according to claim 3, which has been made to solve the above problem, is the frequency characteristic measuring jig according to claim 2, wherein the ground line side contact portion is connected to one end of the chip capacitor. The small contact plate which contacts electrically is also soldered.
[0014]
According to the third aspect of the present invention, the contact area with the capacitor is widened at the contact portion on the ground line side by the small piece contact plate, so that the inductance can be reduced accordingly. Therefore, the frequency characteristic of the capacitor can be measured more accurately.
[0015]
The frequency characteristic measuring jig according to claim 4, which is made to solve the above problem, is the frequency characteristic measuring jig according to claim 1, wherein the core wire is substantially perpendicular. It is bent and soldered to the fixed conductor plate.
[0016]
According to the fourth aspect of the invention, since the core wire is bent at a substantially right angle and soldered to the fixed conductor plate, the core wire can be joined to the fixed conductor plate at the shortest distance.
[0017]
The frequency characteristic measuring jig according to claim 5, which has been made to solve the above-described problem, is the frequency characteristic measuring jig according to claim 1, wherein the core wire side contact portion includes: It is characterized by comprising a protrusion 132b that is in electrical contact with the other end of the chip capacitor.
[0018]
According to the fifth aspect of the present invention, since the core wire side contact portion is composed of the protrusion 132b that is in electrical contact with the other end of the chip capacitor, the capacitor can be easily set and the capacitor can be stably provided. Can be pinched.
[0019]
The frequency characteristic measuring jig according to claim 6, which has been made in order to solve the above-described problem, is the frequency characteristic measuring jig according to claim 1, wherein the fixed conductor plate and the movable plate are movable. Both of the conductor plates have a quadrangular shape having sides of substantially the same width perpendicular to the sliding contact direction.
[0020]
According to the invention described in claim 6, since both the fixed conductor plate and the movable conductor plate have a quadrangular shape having sides of substantially the same width perpendicular to the sliding contact direction, the apparatus becomes larger than necessary. The contact area between the fixed conductor plate and the movable conductor plate can be increased.
[0021]
The frequency characteristic measuring jig according to claim 7, which has been made to solve the above-described problem, is the frequency characteristic measuring jig according to claim 1, wherein the fixed conductor plate has an upper surface. And a dedicated stand for stably supporting the fixed conductor plate.
[0022]
According to the seventh aspect of the invention, since the dedicated base for stably supporting the fixed conductor plate is provided, the measurement accuracy can be extremely stabilized.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1A and FIG. 1B are a plan view and a side view, respectively, showing an embodiment of the frequency characteristic measuring jig of the present invention. As shown in FIGS. 1A and 1B, the frequency characteristic measuring jig 1 is connected to an input / output terminal of a network analyzer capable of measuring the frequency characteristic of a chip capacitor via a connector 6. The other end of the coaxial line 5 to which one end is connected is connected. The frequency characteristic measuring jig 1 is fixed on a base 2 and a support 3 constituting a box-shaped dedicated base. With this dedicated stand, the frequency characteristic measuring jig 1 is reliably supported, and the measurement accuracy can be further stabilized. When the frequency characteristic measuring jig 1 is mounted on the support base 3, a U-shaped guide rib 4 is used.
[0024]
The coaxial wire 5 is a well-known wire made of a core wire 5a, an insulating endothelium 5b, a braided wire 5c, and an insulating endothelium 5b. However, in order to stabilize the high frequency characteristics, it is preferable to select a core wire 5a that is as thick as possible. The coaxial wire 5 has its insulating sheath 5d peeled off, the braided wires 5c are joined together by soldering, and the contact plate 11 of a small piece of conductor is also soldered here. Further, the core wires 5a are peeled off from the insulating endothelium 5b and joined to the copper plate 123 by soldering P1.
[0025]
The frequency characteristic measuring jig 1 fixed on the support 3 is basically composed of a fixed part 12 and a slide part 13. Further, the fixed portion 12 is configured by a fixed portion substrate 121 and a copper plate 122 and a copper plate 123 stacked on the fixed portion substrate 121, and the slide portion 13 is configured by a slide portion substrate 131 and a copper plate 132.
[0026]
The fixing part 12 and the sliding part 13 are tightened with a nut 142 after a screw 141 is passed through a through hole 12a (not shown here) formed in the fixing part 12 and a sliding hole 13a formed in the sliding part 13. Attached and fixed. Specifically, the slide portion 13 can slide or slide on the copper plate 123 of the fixed portion 12 in the direction indicated by the arrow by the length of the slide hole 13a, and the chip capacitor C to be measured is connected to the ground line side (for example, a contact point). When the nut 142 is tightened at a position so as to be sandwiched between the plate 11) and the core wire side (for example, the protrusion 132b), the positional relationship between the two is fixed. The configurations of the fixed portion 12 and the slide portion 13 will be described below with reference to FIGS.
[0027]
2A is a plan view showing a state of the fixing portion before the coaxial line is attached, and FIG. 2B is a plan view showing a state of the fixing portion to which the coaxial line is attached. FIG. ) Is a cross-sectional view taken along line XX of FIG. 3A, 3B, and 3C are a plan view, a rear view, and a side view of the slide portion 13, respectively.
[0028]
First, as shown in FIG. 2A, the vicinity of the end of the coaxial line 5 connected to the network analyzer is in close contact with each other. The coaxial wire 5 has its insulating sheath 5d peeled off, and braided wires 5c as ground wires are joined together by soldering. Therefore, it is possible to accurately measure the frequency characteristic of the capacitor without generating inductance due to the substrate pattern as in the prior art. Furthermore, the small contact plate 11 is also soldered here. Since the contact area with the capacitor is widened by the contact plate 11, the inductance can be reduced accordingly. Moreover, the core wire 5a is stripped from the insulating endothelium 5b.
[0029]
As shown in FIGS. 2B and 2C, the braided wire 5c of the coaxial wire 5 is soldered to a rectangular copper plate 122 stacked on the fixed portion substrate 121 constituting the fixed portion 12. It is fixed at the last P2. Each of the core wires 5a of the coaxial line 5 is joined to a concave copper plate 123 stacked on the fixed portion substrate 121 by soldering P1. Specifically, the core wire 5 a is bent at a substantially right angle and soldered to the copper plate 123. That is, since the core wire 5a is joined to the copper plate 123 at the shortest distance, the inductance from the core wire 5a to the capacitor C can be further reduced. The copper plate 122 and the copper plate 123 are electrically insulated.
[0030]
On the other hand, as shown in FIGS. 3A to 3C, a copper plate 132 is stacked on the slide part substrate 131 constituting the slide part 13 so as to substantially cover the substrate 131. Specifically, the slide portion substrate 131 has a protrusion 131b formed in a portion corresponding to the upper side in the drawing, and the copper plate 132 also has a protrusion 132b corresponding to the protrusion 131b. These protrusions 131b and 132b facilitate the setting of the capacitor C and allow the capacitor C to be clamped more stably. Further, the copper plate 13 is fixed to the slide portion substrate 131 by bending both side portions of the protruding portions 131b and 132b into a U shape. An elongated slide hole 13a for enabling the slide is formed in both the slide part substrate 131 and the copper plate 132 at substantially the center part. Since the copper plate 132 has a substantially quadrangular shape having substantially the same width as that of the copper plate 123 of the fixing portion 12, the contact area with the copper plate 123 can be increased without increasing the size of the apparatus more than necessary. it can. Therefore, an increase in inductance can be suppressed while being compact.
[0031]
In the frequency characteristic measuring jig 1 having such a configuration, when measuring the frequency characteristic of the chip capacitor C, first, a gap larger than the length of the chip capacitor C is formed between the contact plate 11 and the protrusion 131b. As shown, the slide part 13 is slid downward in FIG. Next, the measured chip capacitor C is positioned between the contact plate 11 and the protrusions 131b and 132b. Next, the slide part 13 is slid upward in FIG. 1 so that both ends of the chip capacitor C are in electrical contact with the contact plate 11 and the protrusion 132b. At this position, the nut 142 is tightened to fix the slide portion 13. As a result, the chip capacitor C is sandwiched between the contact plate 11 and the protrusions 131b and 132b. At this time, one end of the chip capacitor C is connected to the ground line side of the coaxial line 5, and the other end of the capacitor C is connected to the core line side of the coaxial line 5 via the copper plate 132 of the slide portion 13 and the copper plate 123 of the fixed portion 12. Electrically connected. That is, the equivalent circuit is the same as in FIG. Thereafter, the frequency characteristics of the currently set chip capacitor C can be measured using a network analyzer by a known method.
[0032]
At the end of measurement, after loosening the nut 142, the slide part 13 is slid in the opposite direction to the above, and the currently set chip capacitor C is removed. Then, the next chip capacitor C is set in the same procedure as described above, and the frequency characteristic of the chip capacitor C can be measured using a network analyzer. Since a network analyzer can be used for the measurement, the frequency characteristic of the chip capacitor C can be obtained as a decibel value.
[0033]
As described above, according to the present embodiment, the frequency characteristic measurement jig that enhances the convenience of frequency measurement without damaging the capacitor, the measurement jig, or the like while promoting the reduction of inductance and increasing the measurement accuracy. Obtainable. In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the main point, it can change suitably.
[0034]
【The invention's effect】
As described above, according to the first aspect of the invention, after the movable conductor plate is slid and the chip capacitor is disposed between the ground wire side contact portion and the core wire side contact portion, the chip capacitor is fixed by the fixing member. Can be pinched. Therefore, it is not necessary to solder the chip capacitor for each measurement as in the prior art, and damage to the chip capacitor and the measurement jig can be prevented. Further, since no skill is required for setting up to the measurement as in the prior art, the measurement time is shortened.
[0035]
According to the second aspect of the present invention, the end of the wire opposite to the side connected to the network analyzer is in close contact with each other, and the ground wires exposed from the end are soldered to each other. In addition, since the contact portion on the ground line side is formed, it is possible to accurately measure the frequency characteristics of the capacitor without generating the inductance due to the substrate pattern as in the prior art.
[0036]
According to the third aspect of the present invention, the contact area with the capacitor is widened at the contact portion on the ground line side by the small piece contact plate, so that the inductance can be reduced accordingly. Therefore, the frequency characteristic of the capacitor can be measured more accurately.
[0037]
According to the fourth aspect of the invention, since the core wire is bent at a substantially right angle and soldered to the fixed conductor plate, the core wire can be joined to the fixed conductor plate at the shortest distance. Therefore, the inductance from the core wire to the capacitor can be further reduced, and the frequency characteristic of the capacitor can be measured more accurately.
[0038]
According to the fifth aspect of the present invention, since the core wire side contact portion is composed of the protrusion 132b that is in electrical contact with the other end of the chip capacitor, the capacitor can be easily set and the capacitor can be stably provided. Can be pinched.
[0039]
According to the invention described in claim 6, since both the fixed conductor plate and the movable conductor plate have a quadrangular shape having sides of substantially the same width perpendicular to the sliding contact direction, the apparatus becomes larger than necessary. The contact area between the fixed conductor plate and the movable conductor plate can be increased. Therefore, an increase in inductance can be suppressed while being compact.
[0040]
According to the seventh aspect of the invention, since the dedicated base for stably supporting the fixed conductor plate is provided, the measurement accuracy can be extremely stabilized.
[Brief description of the drawings]
FIG. 1A and FIG. 1B are a plan view and a side view, respectively, showing an embodiment of a frequency characteristic measuring jig of the present invention.
FIG. 2 (A) is a plan view showing a state of a fixing portion before attaching a coaxial line, and FIG. 2 (B) is a plan view showing a state of the fixing portion to which the coaxial line is attached; FIG. 2C is a cross-sectional view taken along the line XX of FIG.
FIGS. 3A, 3B, and 3C are a plan view, a rear view, and a side view of a slide portion, respectively.
FIG. 4 is a diagram showing a basic circuit configuration relating to this type of frequency characteristic measurement.
5A is a diagram related to a first conventional measurement method, and FIG. 5B is a diagram related to a second conventional measurement method.
[Explanation of symbols]
1 Frequency characteristics measurement jig 2 Base (dedicated stand)
3 Support stand (dedicated stand)
4 Guide rib 5 Coaxial wire (wire)
5a Core wire 5c Braided wire (ground wire side contact part)
11 Contact plate (ground wire side contact part)
12 fixed part 13 slide part 121 fixed part substrate 123 copper plate (fixed conductor plate)
131 Slide part substrate 132 Copper plate (movable conductor plate)
132b Protruding part (core wire side contact part)
141 Screw (fixing member)
142 Nut (fixing member)

Claims (7)

A ground line side contact portion that is formed by bonding ground wires included in wires connected to input / output terminals of an analyzer capable of measuring the frequency characteristics of the chip capacitor, and that is in electrical contact with one end of the chip capacitor. When,
A fixed conductor plate to which core wires contained in the wire are joined;
A through hole formed in the fixed conductor plate;
A movable conductor plate in sliding contact with the fixed conductor plate;
A core wire side contact portion that is a part of the movable conductor plate and is in electrical contact with the other end of the chip capacitor;
A slide hole formed in the movable conductor plate;
A fixing member capable of fixing the movable conductor plate to the fixed conductor plate using the through hole and the slide hole so as to hold the chip capacitor between the ground wire side contact portion and the core wire side contact portion. When,
A jig for measuring frequency characteristics, comprising: In the jig for measuring frequency characteristics according to claim 1,
The end of the wire opposite to the side connected to the network analyzer is in close contact with each other,
The ground wires exposed from the end side are soldered to each other.
A jig for measuring frequency characteristics. The jig for measuring frequency characteristics according to claim 2,
The ground wire side contact portion is also soldered with a small contact plate that is in electrical contact with one end of the chip capacitor.
A jig for measuring frequency characteristics. In the frequency characteristic measuring jig according to any one of claims 1 to 3,
The core wire is bent at a substantially right angle and soldered to the fixed conductor plate,
A jig for measuring frequency characteristics. In the frequency characteristic measuring jig according to any one of claims 1 to 4,
The core wire side contact portion is composed of a protrusion that is in electrical contact with the other end of the chip capacitor.
A jig for measuring frequency characteristics. In the frequency characteristic measuring jig according to any one of claims 1 to 5,
Both the fixed conductor plate and the movable conductor plate have a quadrangular shape having sides of substantially the same width perpendicular to the sliding direction.
A jig for measuring frequency characteristics. In the frequency characteristic measuring jig according to any one of claims 1 to 6,
The fixed conductor plate is attached to the upper surface side, and a dedicated stand for stably supporting the fixed conductor plate,
A jig for measuring frequency characteristics, further comprising:

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