JP3796873B2 - High frequency switch - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a high-frequency switch mainly for opening and closing a high-frequency current circuit, and more particularly to a bending structure of a shield plate thereof.
[0002]
[Prior art and problems to be solved by the invention]
Conventionally, as a high-frequency switch, there is, for example, Japanese Patent Application No. 8-210924. That is, as shown in FIG. 13, a narrow bending end 2 extending laterally from both sides of the shield plate 1 is bent at a substantially right angle, and a ground tongue piece extending from the bending end 2 is formed. 3 is bent at a substantially right angle to form a substantially U-shape.
In order to obtain such a shield plate 1, for example, the base portion of the ground tongue piece 3 is bent at a right angle by a first bending process, and then the base portion 2 of the bending end is bent at a substantially right angle by a second bending process. Need to bend. In particular, in order to perform an accurate bending process, the outer side and the inner side of the ground tongue piece 3 and the bending end 2 are pressed with male and female molds in both the first and second bending processes. There is a need.
[0003]
However, in a high-frequency switch having a maximum width dimension of about 10 mm, the gap between the shield plate body 1a and the ground tongue piece 3 is 1 mm or less. For this reason, the thickness dimension of the metal mold | die which can be arrange | positioned inside the said edge part 2 for bending in the case of a 2nd bending process is less than 1 mm. For this reason, not only is the mold easily damaged, but even when the bending process is completed, it is not easy to extract without damaging the mold. As a result, the mold for forming the inner reference surface could not be used in the second bending process.
[0004]
Therefore, in order to obtain the shield plate 1 as described above, first, a notch line is provided in advance in the bent portion of the outer surface of the bending end portion 2. In the first bending process, the ground tongue piece 3 is accurately bent with a mold disposed outside and inside the ground tongue piece 3. Next, the second bending process was performed by bending only the outer mold, and the bending end 2 was bent along the notch line.
[0005]
However, in the second bending process, there is no mold for forming the reference surface inside the bending end 2. For this reason, the positional accuracy of the ground tongue piece 3 is low, and the operation characteristics tend to vary, resulting in poor yield.
The bending end 2 and the ground tongue 3 are both elongated and easily deformed during conveyance. For this reason, there is a problem that the operating characteristics are more likely to vary and the yield is poor.
[0006]
In view of the above problems, an object of the present invention is to provide a high-frequency switch with high positional accuracy of a ground tongue piece and high yield.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the high-frequency switch according to the present invention sequentially extends the bending end portion and the elongated ground tongue piece from at least one side of the shield plate body erected on the base, and in the plate thickness direction. In a high-frequency switch that is bent and formed into a substantially U shape, and the ground tongue piece is opposed to the shield plate body, the width of the ground tongue piece is made narrower than the bending end portion, while the bending end portion is align the lower edge portion of the lower edge and the elongated ground tongue parts substantially same straight line, the ground tongue Rutotomoni bent from its base at a right angle, the lower edge portion of the portion bent of the folding for an end portion A substantially U-shape is formed by bending at right angles along a slit formed by cutting out in a direction perpendicular to the bending direction.
[0008]
Further, a connecting portion that connects the shield plate main body and the bending end portion may be bridged over the slit.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment according to the present invention will be described with reference to the accompanying drawings of FIGS.
The present embodiment generally includes a base 10, a fixed contact mechanism 20, an electromagnet block 30, a movable iron piece 40, a movable block 50, and a case (not shown).
[0010]
The base 10 is composed of a shallow box-shaped base body 11 made of a dielectric (synthetic resin). Then, a pair of support walls 12 and 13 protrude from the corners of the opposite sides of the base body 11 so as to face each other. Furthermore, bearing grooves 12a and 13a for rotatably supporting a movable block 50, which will be described later, are formed at the upper ends of the support walls 12 and 13, respectively. Further, a positioning curved surface 12b serving as a rotation fulcrum of a movable iron piece 40 to be described later is formed at the base portion of the support wall 12.
[0011]
Discontinuous insulating walls 14a, 14b, 14c, and 14d are provided in a staggered manner between the support walls 12 and 13. A position restricting protrusion 15 protrudes in the vicinity of the insulating wall 14b. Further, a positioning protrusion 16 is provided on the base body 11 so as to be parallel to the position restricting protrusion 15.
[0012]
As shown in FIGS. 1 and 6, the fixed contact mechanism 20 includes fixed contact terminals 21 and 22 having the same shape having fixed contacts 21a and 22a, a common fixed contact terminal 23 having common fixed contacts 23a and 23b, And a shield plate 24.
The fixed contact 21a and the common fixed contact 23b constitute a normally closed fixed contact mechanism, and the fixed contact 22a and the common fixed contact 23a constitute a normally open fixed contact mechanism.
[0013]
As shown in FIG. 7, the shield plate 24 is obtained by punching a plate-like conductive material into a predetermined shape and pressing it, and a plurality of ground terminals 25 protrude on the same straight line on the lower side. At the base portion of the ground terminal 25, a wide portion 25a extending to the fixed contact terminal side is formed. The shield plate 24 is formed in a substantially U shape by bending the bending end portions 26a and 26b and the elongated ground tongue pieces 27a and 27b that are sequentially extended from both ends. A locking claw 29 that locks a return spring 56 of the movable block 50 to be described later protrudes from the upper edge of the shield plate 24.
[0014]
Next, as shown in FIGS. 8 and 9, the first bending process of the shield plate 24 is performed by positioning the molds 60 and 61 at the base portions of the ground tongue pieces 27a and 27b, respectively, and pressing the ground tongue pieces 27a and 27b. Bend 27b. Next, as shown in FIGS. 10 and 11, the second bending process is performed by positioning the molds 62 and 63 along the slits 28a formed at the folding portions of the bending end portions 26a and 26b, and pressing them for bending. The bending work is completed by bending the end portions 26a and 26b (FIG. 12).
[0015]
In the present embodiment, the bending position of the ground tongue pieces 27a and 27b and the bending end portions 26a and 26b are shifted vertically. For this reason, the metal mold | die 62 which forms a reference surface can be arrange | positioned inside the edge parts 26a and 26b for bending in the case of a 2nd bending process. As a result, the bending end portions 26a and 26b can be bent with higher dimensional accuracy than the conventional example.
Further, a connecting portion 28b for connecting the shield plate main body 24a and the bending end portions 26a, 26b, respectively, is bridged over the slit 28a. For this reason, there exists an advantage that it can bend correctly, without producing the twist in the edge parts 26a and 26b for bending.
[0016]
Then, when the fixed contact terminals 21 and 22, the lower end of the common fixed contact terminal 23 and the ground terminal 25 of the shield plate 24 are press-fitted into a terminal hole (not shown) of the base 10, the fixed contact terminals 21 and 22 are inserted. The lower end portion of the common fixed contact terminal 23 and the ground terminal 25 are arranged on the same straight line (FIG. 6). The wide portion 25 a of the ground terminal 25 protrudes from the bottom surface of the base 10. Further, the back surfaces of the fixed contacts 21a and 22a and the common fixed contacts 23a and 23b are in contact with the insulating walls 14a, 14d and 14b and 14c, respectively, so that one half of the fixed contacts 21a and 22a and the common fixed contacts 23a and 23b is shielded. Thus, a shield structure using a so-called stripline line principle is obtained.
[0017]
The electromagnet block 30 has an iron core 33 having a substantially T-shaped cross section inserted into a center hole 32a of a spool 32 around which a coil 31 is wound, and a projecting one end portion serves as a magnetic pole portion 33a, while a projecting other end portion 33b (see FIG. 2) is fixed by caulking to one end of a yoke 34 bent into a substantially L shape. Coil terminals 35 and 35 are press-fitted into both end flange portions 32b and 32b of the spool 32, respectively, and lead wires of the coil 31 are tangled and soldered thereto.
[0018]
Then, the coil terminals 35 and 35 are press-fitted into the terminal holes 11a and 11a of the base 10, respectively, and the yoke 34 is press-fitted between the protrusion 15 and the protrusion 16, whereby the electromagnet block 30 is positioned at a predetermined position. Is done.
[0019]
The movable iron piece 40 is made of a magnetic material bent in a substantially L-shape, and its one side end portion is a narrow portion 41. A notch 42 is formed near the tip of the narrow portion 41.
[0020]
Then, the movable iron piece 40 is dropped between the positioning curved surface 12 b formed at the base portion of the support wall 12 and the tip edge portion of the yoke 34. As a result, the outer corner portion of the movable iron piece 40 is in line contact with the curved surface 12 b, while the inner corner portion is rotatably supported with the tip edge portion of the yoke 34 as a fulcrum, and the one end portion 43 is a magnetic pole of the iron core 33. It can come into contact with the portion 33a. Further, the cutout portion 42 of the movable iron piece 40 can be engaged with the upper end portion of the protrusion 15, and the movable iron piece 40 is positioned so as to leave a predetermined gap between the tip portion of the narrow portion 41 and the yoke 34. Is done.
[0021]
The movable block 50 includes a movable base 51 and a return spring 56.
The movable table 51 is formed by integrally forming movable contact pieces 53a and 53b at lower ends of protrusions 52a and 52b extending downward from the front and back surfaces thereof. Further, the movable base 51 has shaft portions 54, 54 projecting laterally at both end portions thereof. The shaft portion 54 forms a flat surface parallel to the upper and lower sides of the shaft portion 54 to make a relief, and by generating inevitable burrs by resin molding on the flat surface, a smooth rotational motion can be obtained. ing. Further, the movable base 51 has a pair of engaging projections 55, 55 projecting from its inward surface.
[0022]
The return spring 56 is obtained by pressing a thin leaf spring material into a substantially U-shaped cross section. A pair of engagement holes 57, 57 and a protruding protrusion 58 are formed on one side of the return spring 56, and an elastic tongue piece 59 is formed from the remaining one side. It extends to the side.
[0023]
Then, by positioning the return spring 56 between the protrusions 52a and 52b of the movable base 51 and attaching it to the horse riding state, the engagement hole 57 is engaged with the engagement protrusion 55, and the movable block 50 is completed.
[0024]
Next, the movable block 50 is rotatably supported by fitting the shaft portions 54 and 54 of the movable block 50 into the bearing grooves 12a and 13a of the base 10, respectively. Thereby, the movable contact piece 53a opposes the fixed contacts 21a and 23b or the ground tongue piece 27a so as to be able to contact and separate alternately. Further, the movable contact piece 53b faces the fixed contacts 22a and 23a or the ground tongue piece 27b so as to be able to contact and separate alternately.
[0025]
And the movable block 50 is urged | biased by the electromagnet block 30 side by latching the front-end | tip part of the elastic tongue piece 59 of the return spring 56 to the latching claw 29 of the shield board 24 (FIG. 5). For this reason, the protruding protrusion 58 of the return spring 56 comes into pressure contact with the narrow portion 41 of the movable iron piece 40. As a result, the movable contact piece 53a comes into contact with the fixed contacts 21a and 23b, while the movable contact piece 53b comes into pressure contact with the ground tongue piece 27b.
[0026]
In addition, since the movable block 50 of this embodiment is manufactured by integral molding and has high dimensional accuracy, a high-frequency switch with uniform operating characteristics can be obtained.
[0027]
The case (not shown) has a box shape that can be fitted to the base 10, and a protrusion for positioning to protrude is projected from a portion of the ceiling surface located immediately above the shaft portion 54 of the movable block 50. It is.
Then, when the case is fitted to the base 10 incorporating the internal components, the positioning projections face each other while leaving a minute gap with the flat surface of the shaft portion 54. And the assembly work is completed by sealing the joint surface of the base 10 and the case with a sealant.
[0028]
Next, the operation of the high-frequency switch having the above-described configuration will be described.
When no voltage is applied to the coil 31 of the electromagnet block 30, the movable block 50 is biased toward the electromagnet block 30 by the spring force of the return spring 56. For this reason, the movable contact piece 53a is in contact with the fixed contacts 21a and 23b, and the movable contact piece 53b is in contact with the ground tongue piece 27b. In this case, the position of the movable iron piece 40 that is in pressure contact with the protruding protrusion 58 of the return spring 56 is regulated by engaging the notch 42 with the upper end of the protrusion 15. For this reason, a predetermined gap is formed between the tip of the narrow portion 41 of the movable iron piece 40 and the yoke 34.
[0029]
When a voltage is applied to the coil 31 for excitation, the one end portion 43 of the movable iron piece 40 is attracted to the magnetic pole portion 33 a of the iron core 33. For this reason, the movable iron piece 40 rotates, and the narrow portion 41 presses the movable block 50 outward against the spring force of the return spring 56. As a result, the movable block 50 rotates outward with the shaft portion 54 as a fulcrum, and the movable contact piece 53a is separated from the fixed contacts 21a and 23b and contacts the ground tongue piece 27a. Further, the movable contact piece 53b is separated from the ground tongue piece 27b and comes into contact with the fixed contact pieces 23a and 22a, and then one end portion 43 of the movable iron piece 40 is attracted to the magnetic pole portion 33a of the iron core 33.
[0030]
Next, when the application of the voltage to the coil 31 is released, the movable block 50 is rotated in the direction opposite to the aforementioned rotation direction by the spring force of the return spring 56, and the movable contact piece 53a is fixed to the fixed contacts 21a and 23b. On the other hand, the movable contact piece 53b comes into contact with the ground tongue piece 27b and returns to the original state.
[0031]
In the present invention, the dielectric located on the back surface of the fixed contact is not necessarily an insulating wall protruding from the base, and may be a coating film or sheet of dielectric material laminated on the side surface of the shield plate.
[0032]
Further, the position regulation of the movable iron piece 40 is not limited to the case where the movable iron piece 40 is restricted via the protrusion 15 protruding from the base 10, and an insulating film is formed on the tip of the narrow portion 41 or the contact surface of the yoke 34. By doing so, a predetermined gap may be formed.
[0033]
【The invention's effect】
As is apparent from the above description, according to the high-frequency switch according to the first aspect of the present invention, the bending position of the bending end portion and the bending position of the ground tongue piece are shifted up and down. For this reason, after performing a 1st bending process, when performing a 2nd bending process, the metal mold | die which forms a reference surface inside the edge part for bending can be arrange | positioned. As a result, the bending process can be performed more accurately than in the conventional example, and a shield plate with higher dimensional accuracy can be obtained, so that a high-frequency switch with good yield can be obtained without variation in operating characteristics.
In particular, unlike the conventional example, the mold is not held between the shield plate main body and the ground tongue piece, and the mold can be thickened, so that the mold is not easily damaged and the productivity is improved. .
According to the second aspect, since the shield plate main body and the bending end are integrated at the connecting portion extending over the slit, the rigidity is higher than that of the conventional bending end. For this reason, there is an effect that it is difficult to be deformed even during conveyance, and a high-frequency switch having a higher yield can be obtained.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an embodiment of a high-frequency switch according to the present invention.
2 is a perspective view of the high-frequency switch shown in FIG. 1. FIG.
FIG. 3 is a perspective view showing a base assembled with the contact mechanism and the movable block of FIG. 1;
4 is a perspective view showing a base in which the contact mechanism, the movable block, and the movable iron piece of FIG. 1 are assembled. FIG.
5 is a plan view showing a base assembled with the contact mechanism, movable block, movable iron piece and yoke of FIG. 1; FIG.
6 is a perspective view of the fixed contact mechanism shown in FIG. 1. FIG.
7 is a perspective view of the shield plate shown in FIG. 6 before pressing.
8 is a perspective view showing a method of bending the ground tongue piece of the shield plate shown in FIG. 7. FIG.
9 is a perspective view showing a method of bending the ground tongue piece of the shield plate shown in FIG. 7. FIG.
10 is a perspective view showing a method of bending the end portion for bending the shield plate shown in FIG. 7. FIG.
11 is a perspective view showing a method of bending the end portion for bending the shield plate shown in FIG. 7. FIG.
12 is a perspective view showing the shield plate shown in FIG. 7 after being bent. FIG.
FIG. 13 is a perspective view of a shield plate according to a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Base, 11 ... Base body, 12, 13 ... Support wall, 12a, 13a ... Bearing groove, 14a, 14b, 14c, 14d ... Insulating wall, 15 ... Position restricting protrusion, 16 ... Positioning protrusion, DESCRIPTION OF SYMBOLS 20 ... Fixed contact mechanism, 21, 22 ... Fixed contact terminal, 21a, 22a ... Fixed contact, 23 ... Common fixed contact terminal, 23a, 23b ... Common fixed contact, 24 ... Shield plate, 24a ... Shield plate main body, 25 ... Ground Terminals, 25a ... Wide portions, 26a, 26b ... End portions for bending, 27a, 27b ... Ground tongue pieces, 28a ... Slits, 28b ... Connection portions, 29 ... Locking claws, 30 ... Electromagnet block, 34 ... Yoke, 40 ... movable iron piece, 41 ... narrow part, 42 ... notch part, 50 ... movable block, 51 ... movable base, 53a, 53b ... movable contact piece, 54 ... shaft part, 55 ... engaging protrusion, 56 ... returning .

Claims (2)

A bending end and an elongated ground tongue piece are sequentially extended from at least one side of a shield plate main body erected on the base, and are bent in the thickness direction to form a substantially U-shape. In the high-frequency switch that faces the plate body,
While making the width of the ground tongue piece narrower than the folding end portion , the lower end edge portion of the bending end portion and the lower end edge portion of the elongated gland tongue piece are aligned in substantially the same straight line , the ground tongue piece, Rutotomoni bent from the base portion at a right angle, by bending at a right angle along the folding for an end portion of the bent portion lower edge slit formed by cutting in the direction perpendicular to the direction bending of it formed into a substantially U-shape A high-frequency switch characterized by   The high-frequency switch according to claim 1, wherein a connecting portion that connects the shield plate body and the bending end portion is bridged over the slit.

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