JPS6174322A - Electronic mechanism component - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to an electronic mechanical component in which a rotating structure consisting of a combination of a rotating element and a stationary element is housed in a resin case. This invention relates to an improved structure of a resin case that is integrally molded with a terminal made of a metal plate to facilitate manufacturing of the resin case. There are various types of electronic mechanical parts to which this invention applies, such as variable capacitors such as trimmer capacitors, variable resistors, variable coils, and rotary switches, but it is particularly advantageous when applied to small electronic mechanical parts. It is.

Prior Art Prior art of interest to the present invention will be described in connection with trimmer capacitors.

A first conventional example is a trimmer capacitor illustrated in FIGS. 20 to 24. Referring to FIG. 20, which shows the entire groove path, the resin case 1 has two terminals 2.
, 3 are embedded in the mold. One terminal 2
A spring portion 4 is integrally formed in a portion inside the resin case 1 . The end portion of the other terminal 3 located inside the resin case 1 integrally forms a cylindrical portion 5. The inside of the cylindrical part 5 is
When the resin case 1 is molded, it is filled with the molding material. Each terminal 2.3 is drawn out to the outside of the resin case 1.

The resin case 1 has a built-in separate rotary structure formed by a combination of a rotary element and a stationary element. That is, in the case of the trimmer capacitor shown in the figure, a dielectric plate 6, a metal rotor 7, a spring 8, and a driver plate 9 are arranged in this order from the bottom side of the resin case 1.

Among these, the L1m body plate 6 forms the fixed side element,
The metal rotor 7, spring 8, and driver plate 9 constitute a rotating element. On the lower surface of the dielectric plate 6, a roughly semicircular stator electrode 8i10 is formed which electrically and elastically contacts the spring portion 4. A rotor electrode 11 facing the stator electrode 10 with a 351 body plate 6 in between is formed on the metal rotor 7 with a step difference, and as the metal rotor 7 rotates, the opposing areas of the stator electrode 10 and the rotor electrode 11 change. It is now possible to A groove 12 is provided on the upper surface of the metal rotor 7, into which a spring 8 is inserted so as not to rotate with respect to the metal rotor 7. Driver plate 9
is globally fixed to the spring 8 by caulking its lower end. Driver plate 9
For example, there is an adjustment groove 1 in which the tip of the driver can engage.
3 is formed. , from the dielectric plate 6 to the driver plate 9
After the elements up to are inserted into the resin case 1,
The upper end of the cylindrical portion 5 is caulked to prevent these elements from being removed from the resin case 1.

In FIGS. 21 to 23, only the resin case 1 in which the terminals 2.3 are integrally molded is shown. Here, FIG. 21 is a plan view, FIG. 22 is a sectional view taken along line HH in FIG. 21, and FIG. 23 is a bottom view.

In these drawings, when paying attention to the spring part 4 that is integrally formed with the terminal 2, there is a spring part 4 around the periphery 14 of the spring part 4.
A free space is formed so as not to impede the elastic displacement of the That is, the stator electrode 10 and the terminal 2 must be electrically connected reliably by simply placing the dielectric plate 6 on the bottom surface of the resin case 1.
The spring portion 4 utilizes its springiness to the maximum extent to prevent the stator 414 from being damaged.
Must be in contact with 10.

In this manner, in order to leave a free space around the spring portion 4, the resin case 1 is molded using a mold 15 having a shape as shown in FIG. The mold 15 is formed with a protruding wall 16 for receiving the spring part 4 and leaving a free space around it.

FIGS. 25 to 28 are diagrams for explaining a trimmer capacitor as a second conventional example.

Referring to FIG. 25 showing the overall structure of the trimmer capacitor, a resin case 21 is molded with terminals 22 embedded therein. A spring portion 23 is integrally formed in a portion of the terminal 22 located inside the resin case 21. Resin case 2
Similar to the first conventional example described above, the rotary rotary structure 1 has a built-in separate rotary structure formed by a combination of a rotary side element and a stationary side element. That is, in order from the bottom side of the resin case 21, the dielectric plate 24 and the r
A metal rotor 25 serving as a gJ private element is arranged. Then, the other terminal 26 is arranged on the metal rotor 25. A spring portion 2 is provided on the lower surface of the dielectric plate 24.
The two-metal rotor 25 is formed with a roughly semicircular stator electrode 27 that is in electrical and elastic contact with the rotor 3.
A rotor electrode 28 is provided that faces the stator electrode 27 with a dielectric plate 24 in between, and the opposing area between the stator electrode 27 and the rotor electrode 28 can be changed by rotating the metal rotor 25. On the top surface of the metal rotor 25,
An adjustment groove 29 is provided. The terminal 26 includes a ring-shaped hanging portion 30 so as not to prevent insertion of a driver or the like into the adjustment groove 29, and a plurality of spring contact pieces 31 extend from the base portion 30.

The spring contact piece 31 contacts the upper surface of the metal rotor 25 to achieve electrical connection with the metal rotor 25.

FIG. 26 is a plan view showing the resin case 21 integrally molded with the terminal 22, and FIG. 27 is a sectional view taken along the line J--J in FIG. 26.

The terminal 22 forms a wide surface portion 32 within the resin case 21, and while closing the bottom surface of the resin case 21, the T-shaped spring portion 23 folded over via the folded portion 33 is placed above the wide surface portion 32. It is located in Also in this conventional example, a free space must be formed around the periphery 34 of the spring portion 23 so as not to hinder the elastic displacement of the spring portion 23.

Therefore, a mold 35 as shown in FIG. 28 is used,
The resin case 21 is molded.

A protruding wall 36 is formed in the mold 35 in order to receive the spring part 23 and to form a free space 34 around it.

Problems to be Solved by the Invention Two conventional examples that are of interest to the invention have been illustrated above, but when focusing on the molding process of the resin case 1 or 21, there are the following problems. That is, in order to prevent the molding material from wrapping around the periphery 14 or 34 of the spring part 4 or 23, the protruding walls 16 or 36 are fitted around them, as is clear from the illustrated shape of the mold 15 or 35. It must be formed in the mold 15 or 35.

However, in the case of minute parts such as trimmer capacitors, such walls 16 or 36 are mechanically extremely weak and easily damaged during repeated molding, thus shortening the life of the mold. I end up.

Therefore, the present invention provides a single-child fence component having a structure in which a free space can be left around the spring part without providing a mechanically weak part such as the wall 16 or 36 in the mold. It is to be.

Means for Solving the Problems The present invention provides a rotating mechanism unit consisting of a combination of a rotating element and a stationary element, which is built into a resin case, and the resin case is integrally molded with a terminal made of a metal plate. This terminal forms a spring part that electrically and elastically contacts a part of the stationary element on the inner side of the resin case, and also extends to the outside of the resin case. It is aimed at electronic and am parts. In order to solve the above-mentioned problems, an enclosure surrounding the spring portion is formed on the inner surface of the resin case.

Operation The enclosure, which is a feature of the present invention, is already held on, for example, a terminal before the resin case is molded. Therefore, if the mold for molding the resin case is brought into contact with this enclosure, the molding material will be prevented from wrapping around the spring part, and as a result, there will be free space around the spring part. will be left behind.

First Embodiment FIGS. 1 to 11 are diagrams for explaining a first embodiment of the present invention. This first embodiment corresponds to the first conventional trimmer capacitor described with reference to FIGS. 20 to 24.

FIG. 1 is a sectional view showing the overall structure of the trimmer capacitor, and the cutting line thereof corresponds to the position of the line Δ-Δ in FIG. In FIG. 1, except for the terminal 41, the other configurations are substantially the same as those shown in FIG. Omitted. The detailed shape of this terminal 41 is shown in FIGS. 2 to 10.

FIG. 2 is a plan view of the resin case 1 in which the terminals 41 and 3 are integrally molded, and FIG.
FIG. 4 is a cross-sectional view taken along line B-8 in FIG. 2. FIG. FIG. 5 is a bottom view of the resin case 1. The terminal 41 forms a wing portion 42 that is bifurcated inside the resin case 1 . This wing portion 42 is shown in FIGS. 6 to 8. The wing portion 42 is made of two layers with a folded portion 43 interposed therebetween, and a spring portion 44 is formed in a portion located above the folded portion 42 in a state in which it is slightly warped upward. A predetermined space is formed around the periphery 45 of the spring portion 44, and a enclosure 46 is formed with a part of the wing portion 42 so as to surround the spring portion 44 via this space. Note that the direction in which the spring portion 44 extends and the position of the folded portion 43 may be arbitrarily changed depending on the design.

Terminal 41 and terminal 3 are both obtained by punching out a single metal plate 47, as shown in FIG. 9th
As clearly seen in FIG. 10, which is a cross-sectional view taken along line D-D in the figure, this metal plate 47 includes a cylindrical portion 5 that becomes a part of the terminal 3 and a cylindrical part 5 that becomes a part of the terminal 41. Both subcommittees 42 of stacked sheets have already been formed. Also, this quality part 42
is equipped with a spring portion 44.

The metal plate 47 shown in FIGS. 9 and 10 is inserted into a mold for molding the resin case 1 as it is. At this time, it is preferable to cut the series [IS 48.49] in advance. Then, as shown in FIG. 11, the mold 50 is kept in contact with the enclosure 46, and the resin case 1
mold is carried out. Note that illustration of other molds is omitted. The hole 51 formed in the bottom wall of the resin case 1 is a result of a mold being inserted here, and a part of the mold inserted into the hole 51 and the above-mentioned mold 5 are formed.
0 and the other part 42 of the terminal 41 is caught in the darkness, and the enclosure 4
6 comes into contact with the mold 50, and the resin is prevented from going around the periphery 45 of the spring portion 44. Here, in the mold 50,
It should be noted that it is sufficient to form a recess 52 for receiving the spring part 44, and that the mold 50 is in surface contact with the enclosure 46 over a relatively large area.

As clearly shown in FIG. 3, when the resin case 1 is molded using the mold 50 described above, the w4 resin case 1
The mold material and the enclosure 46 form interfacing surfaces. The spring portion 44 is surrounded by a free space around its periphery 45, so that its elastic displacement is not inhibited, and when the dielectric plate 6 is placed, as shown in FIG. , ensuring electrical connection. Note that the base of the terminal 41 is completely buried in the resin case 1 except for the spring portion 44 and the enclosure 46.

Second Embodiment FIGS. 12 to 17 are diagrams for explaining a second embodiment of the present invention. This second embodiment corresponds to the trimmer capacitor of the second conventional example shown in FIGS. 25 to 28 described above. As is clear from comparing FIG. 12 and FIG. 25, which show the overall configuration of each trimmer capacitor, the shape of the terminal 61 is different from the terminal 22, and other parts are almost the same. It is. Therefore, corresponding parts will be given the same reference numerals and their description will be omitted.

The shape of the terminal 61 is clearly seen in FIGS. 13 to 16. FIG. 13 is a plan view showing the resin case 21, and FIG. 14 is a sectional view taken along line EE in FIG. 13. FIG. 15 is a plan view showing the state before the terminal 61 is bent. Figure 16 shows the terminal 6 along line F-F in Figure 13.
1 is a sectional view of FIG.

The terminal 61 is 1. A metal plate is first punched into a shape as shown in FIG. 4th part of terminal 61 1lla left of 62
A spring portion 63 is formed in the IS portion 62a. □The left side portion 62a and the right side portion 62b of the base portion 62 are bent through a folded portion 64 shown by a dashed line, and the left side portion 62
a is superimposed on the right side portion 62b. In addition, in this overlapping state, the periphery of the right side portion 62b is as follows:
It is located outside the periphery of the left side portion 62a.

The terminal 61 shown in FIGS. 13, 14, and 16 is
This is the state after the above-mentioned superposition. While leaving a free space 65 around the spring part 63, an enclosure 66 surrounds the spring part 63 at the left side portion 62, that is, the upper part 62.
formed by a part of a. The gap created around the periphery 65 of the spring portion 63 is the aforementioned right side portion, that is, the lower portion 621.
) has been abandoned.

As shown in FIG. 17, the resin case 21 is molded with the base portion 62 of the terminal 61 inserted into a mold. A mold 67, which is a part of the mold for this mold, has a recess 68 for receiving the spring portion 63, but is in surface contact with the enclosure 66 over a relatively wide rfJg4. The inner surface of the resin case 21 molded by the metal mold 67 forms a wall with the enclosure 66, as shown in FIG. The spring portion 63 is in a state of being slightly curved upward, and when the dielectric plate 24 is arranged as shown in FIG. A reliable electrical connection with the stator electrode 27 is achieved. Note that the molding material for the resin case 21 covers the periphery of the lower portion 62b of the base 62, and the terminal 61 is securely fixed to the resin case 21.

The resin case 21 shown in FIG. 12 has a different shape from the resin case 21 shown in FIGS. 13 and 14. As shown in FIG. 12, after the above-mentioned rotating PjAm section is housed in the resin case 21 and the terminals 26 are arranged, the resin case 21 is placed in order to prevent these elements from collapsing. This is because the upper edge of the case 21 is bent inward.

That is, the upper end edge of the resin case 21 made of, for example, a thermoplastic resin is bent inward while being heated, so as to engage with the base 30 of the terminal 26 . Note that this also applies to the trimmer capacitor shown in FIG. 25 described above.

Third Embodiment FIGS. 18 and 19 are for explaining a third embodiment of the present invention. This third embodiment is obtained by slightly modifying the terminal 61 of the second embodiment described above. That is, the right side portion 62b of the base of the terminal 61
A recess 71 is provided therein. The other configurations are the same as in the second embodiment.

By providing the concave portion 71 in this manner, the elastic displacement range of the spring portion 63 can be widened. For example, as shown in FIG. Even if the right side portion 62b is displaced, the right side portion 62b
It is possible to reliably form a relief to avoid being hit.

Other examples Embodiments other than those illustrated are also possible.

For example, the enclosure surrounding the spring part was formed by using part of the metal plate that makes up the spring part, but it was also possible to form a frame shape in advance from another material and attach it to the terminal later. It can also be fenced.

Further, although the above-mentioned embodiments have been described in connection with a trimmer capacitor, the present invention can be applied to other electronic mechanical components. For example, in the case of a 2 yen resistor, the fixed side element of the rotating mechanism is c +i
A resistor board is built in a resin case, and the present invention is characterized by a terminal that elastically contacts an electrode on the back side that is connected to a resistor formed on the resistor board via a through hole or the like. The following configuration can be applied.

Effects of the Invention According to the present invention, an enclosure surrounding the spring portion of the terminal is formed on the inner surface of the resin case. There is no need to form a protruding wall to prevent the material from going around.

In other words, it is sufficient that the mold has a surface that makes surface contact with the enclosure over a relatively wide area, and the R-order of the mold due to the presence of protruding walls that are mechanically weak parts is sufficient. This can advantageously prevent the shortening of . In addition, it is relatively easy to form an enclosure around the spring part, so no matter how small the spring part becomes, there is no need to modify the mold side. This is advantageous for electronic mechanical parts.

[Brief explanation of drawings]

FIG. 1 is a sectional front view of a trimmer capacitor according to an embodiment of the present invention. FIG. 2 is a flat tn diagram showing the resin case 1 included in the trimmer capacitor shown in FIG. FIG. 3 is a sectional view taken along line 11A-A in FIG. 2. Fourth
The figure is a cross-sectional view taken along line 88-B in FIG. FIG. 5 is a bottom view of the resin case 1 of FIG. 2. 6 is a plan view showing the wing portion 42 of the terminal 41 of FIG. 2. FIG. 7th
The figure is also a front view of the wing portion 42. Season 8 figure is
FIG. 7 is a sectional view taken along line CC in FIG. 6; Figure 9 shows the second
FIG. 6 is a plan view showing a metal plate 47 for obtaining the terminals 41 and 3 shown in FIGS. FIG. 10 is a sectional view taken along line DD in FIG. 9. FIG. 11 is a cross-sectional view showing the resin case 1 being molded using the mold 50. FIG. 12 is a cross-sectional front view showing a trimmer capacitor according to a second embodiment of the invention. FIG. 13 is a plan view showing the resin case 21 of the trimmer capacitor shown in FIG. 12. FIG. 14 is a sectional view taken along ll'E-E in FIG. 13. FIG. 15 is a plan view showing the folded state of the terminal 61. FIG. 16 is a cross-sectional view of the terminal 61 taken along line FF in FIG. 13. FIG. 17 is a sectional view showing a state in which the resin case 21 is molded using the mold 67. FIG. 18 is a plan view of the terminal used in the third practical example of the present invention before being bent. FIG. 19 is a sectional view taken along line GG in FIG. 18. No. 201tl is a cross-sectional front view showing a trimmer capacitor as a first conventional example of the present invention. Figure 21 shows the second
FIG. 2 is a plan view showing the resin case 1 shown in FIG. Figure 22 shows
22 is a sectional view taken along IH-H in FIG. 21. FIG. Figure 23 shows
22 is a bottom view of the resin case 1 of FIG. 21. FIG. Figure 24 shows
FIG. 2 is a cross-sectional view of the resin case 1 being molded using a metal mold 15. FIG. FIG. 25 is a sectional front view showing a trimmer capacitor which is a second conventional example of the present invention. FIG. 26 is a plan view of the resin case 21 of FIG. 25. FIG. 27 is a sectional view taken along IIJ-J in FIGS. 1 and 26. FIG. 28 is a cross-sectional view of the resin case 21 being molded using the mold 35. In the figure, 1.21 is a resin case, 6 and 24 are dielectric plates as fixed side elements, 7 and 25 are metal rotors as rotating side elements, 10°27 is a stator N pole, 41.61 is a terminal, and 44゜63 is the spring part, 45.65
46° 66 is the surrounding area of the spring part. Patent Applicant Murata Manufacturing Co., Ltd. Figure 1 Figure 2 Figure 3 et al. Figure 5 Figure 15 Figure 16 Figure 18 Figure 20 Figure 24 Figure 25 j 17

Claims (1)

[Scope of Claims] A rotating mechanism section consisting of a combination of a rotating element and a stationary element is built into a resin case, and the resin case is integrally molded with a terminal made of a metal plate, The terminal forms a spring portion that electrically and elastically contacts a part of the stationary element on the inner surface side of the resin case, and the terminal is an electronic mechanical component pulled out to the outside of the resin case. An electronic mechanism component, characterized in that an enclosure surrounding the spring portion is formed on the inner surface of the case.