JP2020079769A - Disk resonator - Google Patents

Abstract

An object of the present invention is to improve the measurement accuracy of a disc resonator. A disk resonator includes a first circular flat plate containing a first excitation line, a circular copper foil, a second circular flat plate containing a second excitation line, an annular elastic body, a case portion, and a pressing portion, wherein the case portion is a cylindrical storage portion that stores the first circular flat plate, the circular copper foil, the second circular flat plate, and the annular elastic body with their central axes aligned. wherein the pressing portion is abutted against the annular elastic body, and presses the first circular flat plate, the circular copper foil, and the second circular flat plate stored in the storage portion via the annular elastic body A pressing abutment member is provided. [Selection drawing] Fig. 3

Description

  The present invention relates to a disc resonator.

  In recent years, in the trend of increasing the communication speed of ICT (Information and Communication Technology) devices, reduction of transmission loss of a base material itself used for a printed circuit board used in ICT devices has been advanced. Against the background of such circumstances, it is required to accurately measure the dielectric properties such as the relative dielectric constant and the dielectric loss tangent of the base material. As a device for measuring such dielectric properties, for example, Patent Document 1 discloses a disk resonator that performs measurement with a disk resonance sheet and a sample (base material) sandwiched between a pair of metal plates. There is.

JP, 2014-106224, A

  By the way, when the dielectric property is measured by sandwiching the disk resonance sheet and the sample (base material) with a pair of metal plates, if the pair of metal plates are not pressed uniformly and a gap occurs between the metal plates, the metal plate An air layer is formed between them. The presence of the air layer affects the measurement result. Therefore, in order to accurately measure the dielectric properties such as the relative permittivity and the dielectric loss tangent of the material serving as the base material, it is required to uniformly press the metal plate so as not to create a gap between the pair of metal plates. . However, Patent Document 1 does not disclose anything about this point.

  In one aspect, the invention disclosed herein aims to improve the measurement accuracy of a disc resonator.

  In one aspect, the disk resonator includes a first circular flat plate containing a first excitation line, a circular copper foil, a second circular flat plate containing a second excitation line, an annular elastic body, and a case portion. And a pressing portion, and the case portion is a cylindrical storage for storing the first circular flat plate, the circular copper foil, the second circular flat plate, and the annular elastic body with their central axes aligned. The pressing portion is abutted against the annular elastic body, and the first circular flat plate, the circular copper foil, and the second circular flat plate accommodated in the accommodating portion are interposed via the annular elastic body. It is provided with an abutting member that presses with.

  The present invention can improve the measurement accuracy of the disc resonator.

FIG. 1 is an explanatory diagram of a measurement system in which the disk resonator of the embodiment is connected to a network analyzer. FIG. 2 is a perspective view of the disc resonator of the embodiment. FIG. 3 is a sectional view of the disc resonator of the embodiment. FIG. 4 is an exploded perspective view of the disc resonator of the embodiment. FIG. 5 is an exploded sectional view of the disc resonator of the embodiment. FIG. 6(A) is an explanatory view showing the distribution of pressure acting on the circular copper foil when the disk resonator of the comparative example is used, and FIG. 6(B) uses the disk resonator of the embodiment. It is explanatory drawing which shows the distribution of the pressure which sometimes acts on a circular copper foil. FIG. 7 is a graph showing the reaction force characteristics of the obliquely wound coil spring. FIG. 8A is an explanatory view showing the arrangement of the column portion and the opening portion with the case portion being a cross section at the lower end portion of the tubular portion, and FIG. 8B shows the size of the opposing column portion and the opening portion. It is explanatory drawing compared. FIG. 9A is a graph showing an example of the measurement result when the case is provided with an opening, and FIG. 9B is a graph showing an example of the measurement result when the case is not provided with an opening. Is.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. However, in the drawings, the dimensions, ratios, etc. of the respective parts may not be shown to be completely the same as actual ones. Further, depending on the drawings, for the sake of explanation, there may be cases where actually existing constituent elements are omitted or the dimensions are drawn more exaggerated than they actually are.

  Referring to FIG. 1, the disc resonator 1 of the embodiment is connected to a network analyzer 101 via a cable 19 and a cable 25, and is used as a measuring device 100. The network analyzer 101 outputs a desired frequency and measures the dielectric characteristic of the measurement target set in the disk resonator 1.

  Referring to FIG. 2, the disc resonator 1 includes a case portion 10 and a cover portion 30 as a pressing portion. Further, referring to FIG. 3 to FIG. 5, the disk resonator 1 includes a first pure copper flat plate 18 as a first circular flat plate, a circular copper foil 22, and a second pure copper flat plate 24 as a second circular flat plate. An obliquely wound coil spring (hereinafter, simply referred to as “spring”) 26 formed in an annular shape as an annular elastic body is provided. The materials of the case portion 10 and the cover portion 30 can be appropriately selected from the viewpoint of the reproducibility of the test by the disc resonator 1 and the mechanical strength of the disc resonator 1 itself. In this embodiment, stainless steel, which is a material having a thermal expansion coefficient close to that of pure copper, is selected.

  The case portion 10 includes a main body portion 10a and a cylindrical tubular portion 10b connected to the main body portion 10a. A male screw portion 12 is formed on the outer peripheral wall of the tubular portion 10b. A storage portion 13 is provided inside the case portion 10. The inner peripheral portion of the tubular portion 10b is a part of the storage portion 13. The inner peripheral wall surface of the storage portion 13 has a substantially circular shape, and the inner diameter thereof is Rin. The inner peripheral wall surface of the storage portion 13 is a sliding contact surface 13a of the first pure copper flat plate 18, the second pure copper flat plate 24, and the like.

  The case portion 10 includes an air discharge portion 14 that discharges air from the inside of the storage portion 13 at the upper edge portion of the storage portion 13 (see FIG. 4 ). The air discharge parts 14 are provided at four places. When the installation locations of the air exhaust unit 14 are connected, a substantially square shape is drawn. That is, the air discharge parts 14 are provided at four corners of a square that are inscribed in the storage part 13 that is circular.

  The case portion 10 includes a column portion 15 and an opening portion 16 at the base end portion of the tubular portion 10b. The pillar 15 and the opening 16 will be described in detail later.

  The first pure copper flat plate 18, the circular copper foil 22, the second pure copper flat plate 24, and the spring 26 are stored in the storage portion 13 with their central axes aligned. Referring to FIG. 4, all of these central axes are aligned with the axis line AX. In this embodiment, the first pure copper flat plate 18, the circular copper foil 22, the second pure copper flat plate 24, and the spacer 17 for adjusting the height position of the spring 26 in the axis AX direction are installed. Therefore, in the present embodiment, the spacer 17 is arranged at the bottommost portion of the storage portion 13, and the first pure copper flat plate 18 is laminated on the spacer 17. Then, the first base material 20 to be measured is laminated on the smooth surface 18a of the first pure copper flat plate 18. A guide member 21 made of cycloolefin polymer (COP) holding a circular copper foil 22 at the center is laminated on the upper side of the first substrate 20. Further, the second base material 23 to be measured is laminated on the upper side of the guide member 21. A second pure copper flat plate 24 is laminated on the second base material 23 so that the smooth surface 24 a is in close contact with the second base material 23. The spring 26 is installed in a storage groove 24c that is annularly provided on the back surface side of the smooth surface 24a of the second pure copper flat plate 24.

  Here, each of the first pure copper flat plate 18, the second pure copper flat plate 24, and the guide member 21 has a circular shape, and the outer diameters thereof are all set to Rout. Rout is set so as to correspond to the inner diameter Rin of the accommodating portion 13, and when the first pure copper flat plate 18, the guide member 21, and the second pure copper flat plate 24 are accommodated in the accommodating portion 13, the respective edges are set. The sliding contact surface 13a of the storage portion 13 is slidably contacted. Thereby, the first pure copper flat plate 18, the guide member 21, and the second pure copper flat plate 24 can be easily aligned. The guide member 21 holds the circular copper foil 22 in the center thereof, and as a result, the first pure copper flat plate 18, the second pure copper flat plate 24 and the circular copper foil 22 can be easily aligned with each other. Further, the smooth surface 18a and the smooth surface 24a are also prevented from being inclined.

  Further, since the spring 26 is also installed on the back surface side of the smooth surface 24a of the second pure copper flat plate 24 in the annular storage groove 24c with its center aligned with the axis AX, the central axis of the spring 26 formed in the annular shape. And the central axis of the second pure copper flat plate 24 can be easily matched.

  In the disk resonator 1 of the present embodiment, the first base material 20 and the second base material 23 are also sequentially stacked and housed in the housing portion 13. Here, the first base material 20 and the second base material 23 are formed in a substantially rectangular shape (square), and the corners thereof are stored in the storage portion 13 in accordance with the air discharge portion 14 provided in the storage portion 13. To be done. As a result, the first base material 20 and the second base material 23 are also accommodated in the accommodating portion 13 in the aligned state. Here, the reason why the first base material 20 and the second base material 23 are formed in a substantially rectangular shape is that the workability of the base material that is easily processed into a rectangular shape is emphasized, and The shapes of the base material 20 and the second base material 23 are not limited to rectangles. For example, the circular shape may be the same as the outer diameter of the first pure copper flat plate 18 or the like.

  As described above, according to the disk resonator 1 of the present embodiment, the guide member 21 that holds the first pure copper flat plate 18, the first base material 20, and the circular copper foil 22 in the storage portion 13, and the second base material 23. These can be aligned simply by sequentially laminating the second pure copper flat plate 24.

  The first pure copper flat plate 18 has a first excitation line 18b built in at the center thereof. The first excitation line 18b extends from the cable 19 provided with the bracket 19a. The cable 19 is fixed to the first pure copper flat plate 18 via a bracket 19a. Similarly, the second pure copper flat plate 24 has a second excitation line 24b built in at the center thereof. The second excitation line 24b extends from the cable 25 provided with the bracket 25a. The cable 25 is fixed to the second pure copper flat plate 24 via the bracket 25a. The cable 19 and the cable 25 are connected to the network analyzer 101, respectively. By accommodating both of the first pure copper flat plate 18 and the second pure copper flat plate 24 in the accommodating portion 13, the first excitation line 18b and the second excitation line 24b are aligned.

  Next, the cover portion 30 will be described. The cover portion 30 has a female screw portion 31 that is screwed into the male screw portion 12 of the case portion 10 inside the main body portion 30a, and also has an abutting member 33 that abuts against the spring 26. The butting member 33 is provided inside the cover 30 via the bearing 32. The abutting member 33 includes the first pure copper flat plate 18, the first base material 20, the circular copper foil 22, and the second pure copper plate 18, which are housed in the housing unit 13 via the spring 26 when the cover unit 30 is assembled to the case unit 10. The base material 23 and the second pure copper flat plate 24 are pressed.

  The abutting member 33 has a tubular portion 33a extending along the axis AX direction and a flanged portion 33b connected to the tubular portion 33a so as to spread in a direction orthogonal to the axis AX direction. The brim-shaped portion 33b has an abutting surface 33b1 that abuts on the spring 26.

  The bearing 32 interposed between the main body portion 30a of the cover portion 30 and the butting member 33 includes an annular inner peripheral wall portion 32a, an annular outer peripheral wall portion 32c, and balls 32b sandwiched between these. The tubular portion 33a is fitted inside the inner peripheral wall portion 32a of the bearing 32. Then, the main body portion of the cover portion 30 is fitted into the outer peripheral wall portion 32c of the bearing 32. As a result, the butting member 33 is provided on the cover portion 30 via the bearing 32.

  When the cover portion 30 is assembled to the case portion 10, the main body portion 30a is rotated and the male screw portion 12 and the female screw portion 31 are screwed together. When the male screw portion 12 and the female screw portion 31 are screwed together, first, the butting surface 33b1 of the butting member 33 comes into contact with the spring 26. Then, the abutting member 33 and the inner peripheral wall portion 32a of the bearing 32 in which the abutting member 33 is fitted stop rotating due to friction between the abutting surface 33b1 and the spring 26. From this state, when the main body portion 30a integrated with the outer peripheral wall portion 32c of the bearing 32 is further rotated and the cover portion 30 is further tightened, the abutting member 33 presses the spring 26. This pressing force brings the first base material 20, the circular copper foil 22 and the second base material 23 into close contact with each other via the second pure copper flat plate 24. At this time, the spring 26 presses the second pure copper flat plate 24 concentrically evenly over the entire circumference thereof. As a result, the first base material 20 and the second base material 23, which are measurement targets, and the circular copper foil 22 are also uniformly pressed over the entire area.

  In the present embodiment, by using the annular spring 26, the second pure copper flat plate 24 can be pressed concentrically and uniformly, and a gap may be generated between the first pure copper flat plate 18 and the second pure copper flat plate 24. It is possible to avoid the formation of an air layer. As a result, it is possible to obtain accurate measurement results that are not affected by the air layer.

  Here, FIG. 6(A) shows the distribution of pressure acting on the circular copper foil when the disk resonator of the comparative example is used, and FIG. 6(B) uses the disk resonator 1 of the embodiment. The distribution of the pressure acting on the circular copper foil when it is exposed is shown. The distribution of pressure is represented by shades of color, and it is shown that the pressure is evenly distributed in a region having the same shade of color.

  The disk resonator of the comparative example includes a pair of pressing plates that sandwich the first pure copper flat plate and the second pure copper flat plate. The pair of pressing plates are rectangular, and the four corners thereof are bolted to hold the first pure copper flat plate and the second pure copper flat plate. In this manner, when the four corners are tightened with bolts, the first pure copper flat plate and the second pure copper flat plate are relatively inclined due to the tightening torque of the bolts and the order of tightening, and a gap may be formed between them. . As a result, the pressure distribution in the circular copper foil portion may not be uniform as shown in FIG. 6(A).

  On the other hand, when the disc resonator 1 of the present embodiment is used, it can be seen that the pressure distribution in the circular copper foil portion is uniform as shown in FIG. 6(B). Therefore, by using the disc resonator 1 of the present embodiment, it is possible to avoid the formation of an air layer and improve the measurement accuracy.

  As described above, in the disk resonator 1 of the present embodiment, the formation of the air layer is avoided, but in order to avoid the formation of the air layer, it is convenient for the air to be smoothly discharged from the storage portion 13. .. Since the disk resonator 1 of the present embodiment includes the air discharge part 14, the first pure copper flat plate 18, the first base material 20 and the like are sequentially stacked in the storage part 13, and these are abutted by the abutting member 33. Air can be discharged from the inside of the storage portion 13 when pressing. As a result, it is possible to prevent the formation of an air layer by closely contacting the members stacked in the storage unit 13.

  Next, the characteristic of the reaction force of the spring 26 will be described with reference to FIG. 7. FIG. 7 is a graph showing the relationship between the compression ratio and the reaction force obtained when a load is applied from above and below to the spring 26 in which the annular shape is set to expand in the horizontal direction. According to this graph, the spring 26 has a region in which its reaction force hardly changes even if its compression rate increases. In the disk resonator 1 of this embodiment, the constant reaction force region of the spring 26 is used. As a result, the reaction force exerted by the spring 26 becomes constant even if the tightening amount of the cover portion 30 with respect to the case portion 10 changes to some extent, and the measurement can always be performed under the same conditions. A member having a constant reaction force region in which the reaction force is constant even if the compression ratio changes can be used instead of the spring 26. For example, an elastomer packing member may be used.

  Next, the column portion 15 and the opening portion 16 provided at the base end portion of the tubular portion 10b of the case portion 10 will be described with reference to FIGS. 3, 4, 8A, and 8B. . Referring to FIG. 3, the pillar portion 15 is provided at a position located on the side of the circular copper foil 22 when the first pure copper flat plate 18, the circular copper foil 22 and the second pure copper flat plate 24 are stored in the storage unit 13. Has been. Further, referring to FIG. 4, an opening 16 is provided adjacent to the pillar 15. The opening portion 16 communicates the storage portion 13 with the outside thereof. Such an opening is provided not only for discharging air from the storage portion 13 but also for suppressing generation of unnecessary resonance at the time of measurement.

  Referring to FIGS. 8A and 8B, in the disk resonator 1 of the present embodiment, three pillars 151, 152, 153 and three openings 161, 162, 163 are alternately arranged. Has been done. Further, the pillars 151, 152, 153 and the openings 161, 162, 163 are arranged to face each other with the central portion (axis AX) of the storage portion 13 interposed therebetween.

  Here, the ends 151a, 152a, 153a of the respective pillars are defined as an angle, and the angle when the ends 151a, 152a, 153a are connected to the axis AX of the storage part 13 is defined as θ1. θ2 is, for example, an angle when the two ends 151a of the pillar 151 and the axis AX are connected, and indicates the range of the pillar 151. The range between the pillar portion 152 and the pillar portion 153 is also set to θ2. On the other hand, θ1 is, for example, the angle when one end 151a of the pillar 151 and the end 152a of the pillar 152 that separates the opening 163 and the axis AX are connected, and indicates the range of the opening 163. ing. The ranges of the openings 161 and 162 are also set to θ1. Here, θ1 and θ2 are set to θ2<θ1. As a result, the range of the pillars 151, 152, 153 is narrower than that of the openings 161, 162, 163.

  As a result, when the pillars 151, 152, 153 are projected toward the openings 161, 162, 163 that are arranged opposite to each other, the projected range of the pillars 151, 152, 153 is the openings 161, 162, 163. It is set to be narrower than the range. That is, the pillar portions are arranged so as not to face each other.

  Specifically, referring to FIG. 8B, the opening 162 is provided at a position facing the pillar 152. Here, the width Wpillar of the pillar portion 152 is narrower than the width Wopen of the opening portion 162. An opening 161 is provided at a position facing the pillar 151, and an opening 163 is provided at a position facing the pillar 153. The dimensional relationships between them are both the pillar 152 and the opening 162. It is set similarly to the relationship of.

  By arranging the pillars 151, 152, 153 and the openings 161, 162, 163 in this way, generation of unnecessary resonance during measurement is suppressed. Here, the effect of installing the openings 161, 162, 163 will be described with reference to FIGS. 9A and 9B. 9A shows an example of the measurement result when the openings 161, 162, 163 are provided, and FIG. 9B shows an example of the measurement result when the openings are not provided. Comparing the measurement results shown in FIG. 9(A) with the measurement results shown in FIG. 9(B), the measurement results shown in FIG. 9(B) show unnecessary amplitudes indicated by a, b, and c in the figure. It appears. On the other hand, in the measurement result shown in FIG. 9A, unnecessary amplitude does not appear, and it can be seen that an accurate measurement result is obtained.

  According to the disk resonator 1 of the present embodiment, the abutting member 33 presses the first pure copper flat plate 18, the circular copper foil 22 and the second pure copper flat plate 24 via the spring 26. Thereby, no gap is generated between the first pure copper flat plate 18 and the second pure copper flat plate 24 even when the first base material 20 and the second base material 23 are set. As a result, a constant load is applied to the first base material 20 and the second base material 23, the formation of an air layer is avoided, and the measurement accuracy can be improved.

  Further, in the disk resonator 1 of the present embodiment, the first pure copper flat plate 18, the first base material 20, the circular copper foil 22, the second base material 23, and the second pure copper flat plate 24 are sequentially stacked in the storage portion 13. To store. At this time, each element is in sliding contact with the sliding contact surface 13a of the accommodating portion 13, so that positioning can be performed easily, and the reproducibility of assembly of the disk resonator 1 for measurement is high. Therefore, for example, the same measurement result can be obtained even when different measurers handle the disk resonator 1.

  In the disk resonator 1, it is only necessary to screw the female screw portion 31 into the male screw portion 12 and tighten the cover portion 30 into the case portion 10. Therefore, the assembly reproducibility is also high in this respect.

  Further, since the disc resonator 1 includes the column portion 15 and the opening portion 16, generation of unnecessary resonance during measurement is suppressed.

  Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the specific embodiments, and various modifications within the scope of the gist of the present invention described in the claims. It can be changed.

DESCRIPTION OF SYMBOLS 1 disk resonator 10 case part 10b cylindrical part 12 male screw part 13 storage part 13a sliding contact surface 14 air discharge part 15 pillar part 16 opening 18 first pure copper flat plate 18b first excitation wire 20 first base material 21 guide Member 22 Circular copper foil 23 2nd base material 24 2nd pure copper flat plate 24b 2nd excitation line 26 Spring 30 Cover part 31 Female screw part 33 Abutting member 33b1 Abutting surface 100 Measuring system

Claims (9)

A first circular flat plate containing a first excitation line;
Circular copper foil,
A second circular flat plate containing a second excitation line;
An annular elastic body,
Case part,
Pressing part,
Equipped with
The case portion includes a cylindrical storage portion that stores the first circular flat plate, the circular copper foil, the second circular flat plate, and the annular elastic body with their central axes aligned.
The pressing portion is abutted against the annular elastic body, and presses the first circular flat plate, the circular copper foil, and the second circular flat plate housed in the housing part through the annular elastic body. A disk resonator having a pad member.   The disk resonator according to claim 1, wherein the housing portion includes at least a sliding contact surface with which the first circular flat plate and the second circular flat plate slide.   The disk resonator according to claim 2, further comprising a guide member that holds the circular copper foil in a central portion and that is in sliding contact with the sliding contact surface.   The case portion has a pillar portion and a pillar portion at a position located laterally of the circular copper foil when the first circular flat plate, the circular copper foil, and the second circular flat plate are stored in the storage portion. The disk resonator according to any one of claims 1 to 3, further comprising: an opening that is adjacent to the portion and that allows the storage portion to communicate with the outside.   The pillar portion and the opening portion are arranged so as to face each other with a central portion of the storage portion facing each other, and when the pillar portion is projected to the opening portion side that is arranged to face each other, the range of the projected pillar portion. Is narrower than the range of the said opening part, The disk resonator of Claim 4. The case portion includes a tubular portion whose inner peripheral portion is at least a part of the storage portion, and an external thread portion on an outer peripheral wall of the tubular portion,
The disk resonator according to any one of claims 1 to 5, wherein the pressing portion is a cover portion that has a female screw portion that is screwed into the male screw portion and that has the abutting member built therein.   The disk resonator according to claim 6, wherein the butting member is provided on the cover portion with a bearing interposed.   The disk resonator according to any one of claims 1 to 7, wherein the case portion includes an air discharge portion that discharges air from the storage portion at an upper edge portion of the storage portion.   9. The disk resonator according to claim 1, wherein the annular elastic body is an obliquely wound coil spring formed in an annular shape.

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