JPH0731480Y2 - Switch for transmission line - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission line switch used for switching a wide band transmission line ranging from direct current to microwave band. Especially, it has a simple structure
At high frequencies where matching and cross-talk
Effective transmission line switch.

[0002]

2. Description of the Related Art Conventionally, as a transmission line switch of this type, a single contact type switch shown in FIGS.
The double contact type shown in (a) and (b) is used.
This single contact type and twin contact type transmission line switch is shown in FIG.
This will be described with reference to (a), (b) and FIGS. 7 (a), (b). In a single-contact type transmission line switch, one end of a cantilevered leaf spring, which is the center conductor, is fixed to one of the center contacts of the input / output terminals, and the intermediate portion of the leaf spring is pushed by a push rod that reciprocates by electromagnetic force. , Which is to be joined to the center contact of the other input / output terminal. Here, FIG. 6A shows a make time, and FIG. 6B shows a break time.

Further, in the dual contact type transmission line switch, the input and output terminals are arranged in parallel, and the leaf spring, which is a central conductor connecting between the two terminals toward the central contact point, reciprocates by electromagnetic force to make a disconnection. It has a structure to do. Note that FIG.
7A shows a make time, and FIG. 7B shows a break time.
Further, as a prior art, Japanese Patent Laid-Open No. 57-111924
There was a technique shown in the report.

[0004]

However, the conventional transmission line switch described above has the following problems. FIG. 6 (a), (b) and FIG.
In the structures shown in (a) and (b), the characteristics are represented by the crosstalk attenuation amount between the input and output terminals and the impedance matching characteristics. The amount of crosstalk attenuation is determined by the distance between the leaf spring and the terminals or the distance between the input and output terminals. Since the impedance matching characteristic is determined by the ratio of the shape dimensions of the center conductor and the outer conductor in the transmission line, it is necessary for the leaf spring and the terminal connected to it to maintain a constant distributed capacitance with the outer conductor continuously over the length of the leaf spring. is there. Therefore, the straighter the transmission line, the more advantageous the characteristics.

However, as shown in FIG.
In the single-contact type transmission line switch shown in (b), in order to improve the crosstalk attenuation, it is necessary to make the distance between the leaf spring contact and the center contact of the terminal as large as possible. However, there is a disadvantage that the switching time is delayed as the outer shape of the device becomes large.

Further, in the double contact type transmission line switch shown in FIGS. 7A and 7B, the distance between the contacts is long and the crosstalk attenuation is improved, but the central conductor line is U between the input and the output. Since it swivels into a mold, it is difficult to achieve impedance matching at the bent portion, and there is a drawback that transmission loss due to mismatching increases. Furthermore
Japanese Patent Laid-Open No. 57-111924 discloses the following.
There was a flaw. (1) Considering impedance matching
Not in. (2) The structure that seems to prevent crosstalk is shown
However, its structure is complicated (Fig. 3). (3)
What is shown in FIGS. 4 and 5 is an actuator.
Also serves as a shield plate, so it also has the effect of preventing crosstalk.
It seems to have, but when operating as a shield plate
Electrical impedance is not considered. High for example
Even if it is shielded by impedance, its effect is not great.

Therefore, the present invention has been made to solve the above-mentioned problems, and can be constructed simply by suppressing the number of parts to the minimum necessary, the crosstalk attenuation at break can be greatly improved, and the transmission line at the time of make-up can be improved. It is an object of the present invention to provide a transmission line switch that can improve the impedance matching characteristics of the. The present invention is disclosed in JP-A-57-111924.
Compared to the one in the publication, the impedance matching is shown when making.
Input terminal and output terminal at break
The space between the children is divided by the movable piece, and
Impedance by grounding both ends of
To reduce the amount of crosstalk.
The movable piece is driven to rotate in order to achieve the purpose with a simple structure.
Therefore, it is different in the idea of having the functions of transmission and shielding.
Become.

[0008]

In order to achieve the above object, each of the transmission line switches of the present invention has a make contact 3
Inputs that have a and 4a and are arranged so as to face each other on a substantially straight line.
Terminal 3 and output terminal 4, and the input terminal and output terminal
An armature consisting of a good conductor that supports and surrounds the space between them.
The case 1 as a switch and the input and output terminals
To move or make up, and to drive the movable piece.
In a switch for a transmission line including a driving means 17 that moves, break contacts 11, 11 electrically connected to the case are provided inside the case near the input terminal and the output terminal. The movable piece is made of a thin and long straight plate made of a good conductor. The movable piece is rotatably driven by the driving means about its midpoint, so that the end portions 7a, 7a in the length direction thereof are the make contact or the break contact. Between the input terminal and the output terminal in a state in which the characteristic impedance of the transmission line is formed together with the case in a state where the end portion is in contact with the break contact and the end portion is in contact with the make contact. The structure is characterized in that it crosses the space diagonally to shield both terminals and grounds both ends to prevent crosstalk between both terminals.

[0009]

The action of the movable piece 7 is such that the position of the rotating shaft is changed to the make contacts 3a, 4
a and the break contacts 11 and 11 are almost at the midpoints, and
With the plate-shaped surface upright with respect to the rotation direction, the input terminal 3
And turning across the output terminal 4 so as to cut off diagonally
To do. Then, at the time of making, the contacts 7a, 7a at both ends of the leaf spring (movable piece) 7 forming the central conductor are driven by the driving means 17 to make the contacts 3a of the input terminal 3 and the output terminal 4.
The transmission lines are formed by contacting a and 4a and making them conductive. Further, at the time of break, the leaf spring 7 is rotated by the driving means 17 so that the contacts 7a, 7a come into contact with the break contacts 11, 11 of the case 1 to be grounded, and the transmission line connects between the input terminal 3 and the output terminal 4. The function is changed to a shield member that shields.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 (a) and 1 (b) are diagrams showing a transmission line switch (hereinafter referred to as a switch) according to the present invention and showing operating states during make and break, and FIG. 2 is an exploded view of the switch. 3A and 3B are a perspective view and a plan view and a bottom view of the switch, respectively.

In the figure, reference numeral 1 is a case forming an electrically insulated earth conductor. Both sides 1 of this case 1
The screw portions 2 and 2 are formed in a straight line below a and 1a, and an input terminal (input connector) 3 and an output terminal (output connector) 4 each having make contacts 3a and 4a at the tips thereof are screwed. It is fixed together. Both sides 1a, 1 of the case 1
The receiving part 5 is integrally formed between a and a. A through hole 6 is formed in the center of the receiving portion 5, a shaft 8 of a leaf spring 7 forming a movable piece is fixedly inserted at the end thereof, and is rotatably supported by a stop ring 9. Further, a magnet 10 is attached to a cut 8a portion of the shaft 8 protruding from the through hole 6.

The leaf spring 7 is made of an electrically good conductor, and has contacts 7a, 7a at both ends thereof for ensuring contact reliability. Break contacts 11, 11 are formed on the surfaces 5a, 5a of the receiving portion 5 with which the contacts 7a, 7a of the leaf spring 7 come into contact. Further, the case 1 has L-shaped magnetic plates 12, 13 in which mounting holes 12a, 13a are formed so as to sandwich the magnet 10.
Are opposed to each other. A bobbin 16 having a coil 15 wound around an iron core 14 is axially supported between the mounting holes 12a and 13a of the magnetic plates 12 and 13, respectively.

Here, the magnet 10 and the magnetic plate 1
2, 13, the iron core 14, the coil 15, and the bobbin 16 constitute a driving means 17, which is a polarized electric system using electromagnetic coils and has high electromagnetic efficiency. Further, the rotational reciprocating motion of the magnet 10 obtained here is transmitted to the leaf spring 7 via the shaft 8. Further, the transmission line is constructed by the leaf spring 7 forming the central conductor and the case 1 by the coaxial transmission method. That is, the relationship between the leaf spring 7 and the case 1 is coaxial.
Designed with a dimensional structure for transmission, a constant characteristic impeder
It is designed to be

Further, the terminals 1 are provided on the front surface 1b of the case 1.
8 is provided and supplies a drive source to the drive means 17 from the outside. Further, a lid 19 is attached to the concave fitting portion 1c on the back surface of the case 1, and a cover 20 is attached to the upper surface 1d of the case 1 to keep the inside substantially sealed.

Next, the operation of the switch configured as described above will be described. First, at the time of makeup, the driving means 1
The contacts 7a, 7a of the leaf spring 7 forming a movable piece by driving 7
Are make contacts 3a, 4a of the input terminal 3 and the output terminal 4.
To contact the I / O terminals 3 and 4 to make them conductive. In this case, the leaf spring 7 and the input / output terminals 3 and 4 form a substantially straight line mechanically , and as described above, the leaf spring 7 and the case 1 are not formed.
Impedance of input / output terminals 3 and 4
It is possible to easily perform impedance matching of the transmission line because it is adjusted to .

Further, at the time of a break, the contacts 7a, 7a of the leaf spring 7 are driven by the driving means 17 so that the input terminals 3 and
The output terminal 4 is crossed so as to be obliquely shielded, and the break contacts 11 and 11 of the case 1 forming a ground conductor are brought into contact with each other to make the input terminal 3 and the output terminal 4 non-conductive .
Space between them (the signal propagates from the input terminal 3)
Space) , and contacts 7a, 7a are break contacts
By being grounded at 11, 11, the impingement of the leaf spring 7
Since the impedance is lowered, extremely high crosstalk attenuation can be obtained.

Here, FIG. 4 shows experimental data of frequency-crosstalk attenuation amount characteristics of the double contact type and single contact type switches of the present invention when the distance between contacts is the same. In this experimental data, the contact 7 of the leaf spring 7 forming the central conductor
When a and 7a come into contact with the break contacts 11 and 11 at the time of break and are grounded, an improvement of about 15 dB is achieved over a wide band when compared with a double contact type switch. Further, as compared with the single-contact type switch, an improvement of nearly 30 dB is observed, and it is clear that the crosstalk attenuation amount is significantly improved.

The present invention uses the input / output terminals 3 and 3 when making.
4. A shield plate in which contact points 7a, 7a of a leaf spring 7 forming a central conductor connecting the make contact points 3a, 4a, which are the central contact points of 4, are broken into the central contact points of the input / output terminals 3, 4 which are grounded at the time of break and face each other. Its main purpose is a structure that changes its function. Therefore, as the driving means 17 for driving the leaf spring 7, as shown in FIG. 5, the shaft 8 is substituted by the pressing rod 21 to rotate, or the center of the leaf spring is fixed and the input / output terminal is formed only by the deflection of the leaf spring. It may be configured to make a disconnection between them.

Further, in the above-described embodiment, the leaf spring 7 has the contacts 7a, 7a at both ends and is formed integrally, but the contacts 7a, 7a may be electrically connected. It is not limited to this.

[0020]

As described above, in the transmission line switch according to the present invention, the movable piece that comes into contact with the make contact to form the transmission line at the time of make is rotated by the driving means at the time of break to make the break contact. Since the function of the shield member is changed to a shield member that contacts the input terminal and the input terminal and the output terminal in a non-conducting state, the number of components can be minimized to a simple configuration. Further, also serves the function of the movable piece transmission line and the shield member, the presence of unwanted shielding member make time is rather name movable piece and output terminal
The space is almost mechanically straight, and the leaf spring and case are
Since the coaxial transmission line is formed , the characteristic impedance can be matched and the transmission loss can be reduced. Furthermore, at the time of a break, both ends of the movable piece come into contact with the break contacts, and both ends of the movable piece are surely dropped to the ground.
Since the shield member has low impedance, the shield effect between the contacts is enhanced, the amount of leakage is extremely small, and high isolation can be obtained between the contacts.

[Brief description of drawings]

1A and 1B are diagrams showing a switch according to the present invention and showing operating states at the time of make and break.

FIG. 2 is an exploded perspective view of the switch.

3A and 3B are a plan view and a bottom view of the switch.

FIG. 4 is a diagram showing frequency-crosstalk attenuation amount characteristics.

FIG. 5 is a diagram showing another embodiment.

6A and 6B are views showing an example of a conventional switch.

7A and 7B are views showing an example of a conventional switch.

[Explanation of symbols]

1 ... Case (ground conductor), 3 ... Input terminal, 3a ... Make contact, 4 ... Output terminal, 4a ... Make contact, 7 ... Leaf spring (movable piece), 10 ... Magnet, 12, 13 ... Magnetic plate,
14 ... Iron core, 15 ... Coil, 16 ... Bobbin, 17 ... Driving means.

Claims (1)

[Scope of utility model registration request] 1. A make contact (3a), (4a), respectively.
Input terminals (3) that have and are arranged so as to face each other on a substantially straight line
And the output terminal (4) and the input terminal and the output terminal
A ground made of a good conductor that supports and surrounds the space between them.
Case (1) as above and the input and output terminals are
A movable piece (7) for rake or make, and the movable piece
A transmission line switch including a driving means (17) for driving the piece.
In the switch, inside the case, the input terminal and the output terminal
A break contact near the child that electrically connects to the case.
The point (11, 11) is provided, and the movable piece is an elongated conductor.
It consists of a substantially straight plate, and the drive is centered around its midpoint.
The end of the length direction is driven by the moving means.
Part (7a, 7a) is the make contact or break contact
And the end is in contact with the make contact.
The characteristic impedance of the transmission line along with the case
Formed and the end is in contact with the break contact
Cross diagonally across the space between the input and output terminals
Shield both terminals and ground both ends.
A transmission line switch characterized by having a structure that prevents crosstalk between both terminals .