JPH0230916Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an improvement of a lumped constant type variable delay line that combines a coil wound with a conductor and a capacitor.

[Prior art and its problems]

This type of variable delay line consists of multiple coils wound around multiple turns of conductive wire arranged coaxially around a bobbin.
Multiple connection conductors that also serve as fixed contacts are formed on a printed board placed close to the bobbin, and the connection points with adjacent coils, capacitance electrodes of capacitors, and connection conductors are soldered and connected, and the fixed contacts are slid. Some devices have a structure having multiple sections in which movable contacts are arranged.

In such a variable delay line, the delay time can be easily switched by sliding the movable contact.

However, in the variable delay line configured in this way, the capacitance electrode and the connection point are connected to the connection conductor as a method of connecting the capacitance electrode of the capacitor, the connection point of the coil in the adjacent section, and the connection conductor of the printed circuit board. However, such a connection method is extremely laborious and tends to be uncertain.

For example, the part on the connecting conductor where the lead wire from the coil is soldered is uneven in height and uneven, and it is extremely difficult and uncertain to overlay the capacitor electrode of a capacitor on this connection part and directly solder it. be. Furthermore, when soldering a capacitor, the soldered portion must be melted again with solder, which also makes the soldered connection unreliable.

[Purpose of invention]

The present invention was developed under these circumstances, and aims to provide a small variable delay line that can be easily and securely connected to coils, capacitors, and connecting conductors, and is simple in assembly and structure.

[Structure and effect of the idea]

In order to achieve this purpose, the present invention connects a plurality of coils made of wound conductors in series, and connects each of the plurality of connecting conductors, which are formed on an insulating plate arranged to pass over these coils and also serves as a fixed contact, to A variable delay comprising connecting connection points of coils in adjacent sections of the coils, connecting capacitance electrodes of a capacitor to each of the connection points, and arranging a movable contact means that moves in contact with the fixed contact. In the wire, the connection point and the capacitor electrode are connected to one end of the connection conductor and an end remote therefrom.

According to the configuration of the present invention, the connections between the coil connection points (coil lead wires) and the capacitor electrodes of the capacitor are made at different locations on the connecting conductor. Even when stacked on the connecting conductor, it is possible to ensure a reliable soldered connection, and when connecting the capacitor electrode of the capacitor or the connection point of the coil, other connecting solder will not be melted, and the connection will be reliable. Example] The details of the present invention will be described below.

1 and 2 are a front sectional view and a side sectional view showing an embodiment of the present invention.

In both figures, a rod-shaped non-magnetic bobbin 1 with a rectangular cross section has a coil 2 formed by winding a plurality of turns of a conductive wire into a single-layer solenoid shape coaxially at a predetermined pitch and connected in series, and an inductance element. 3 is formed.

The inductance element 3 is placed horizontally within the casing 5, with support portions 4 protruding from opposing side surfaces at both ends of the bobbin 1 placed on the inner bottom of the casing 5 which is open from above.

A printed circuit board 6 is placed on the support portion 4 located above the horizontally placed bobbin 1 so as to extend over the coil 2.

As shown in FIG. 4, the printed circuit board 6 has a plurality of connecting conductors 7 formed on one principal surface of a thin and elongated insulating plate 6a, each parallel to the axial direction of the insulating plate 6a. There is. Each central portion of these connecting conductors 7 serves as a fixed contact 8, and a fixed contact row 9 is formed by the plurality of fixed contacts 8 in the axial direction of the insulating plate 6a.

A plurality of V-shaped cuts 10 are continuously formed at one end of the insulating plate 6a along the axial direction. The connecting conductor 7 has a cut groove 11 extending toward the end where the cut 10 is formed and the end where the cut 10 is not formed.
is formed.

Note that these connecting conductors 7 are preferably formed by photoetching or the like from a general printed circuit board, and the notches 10 are preferably formed by pressing or the like.

A lead wire 2a (functioning as a connection point) twisted and led out from an adjacent coil 2 is soldered to the end of each connection conductor 7 on the notch 10 side through the V-shaped notch 10.

In each connection conductor 7, a capacitor 12 is provided at each end opposite to the end to which the lead wire 2a is connected.
is connected.

This capacitor 12 consists of a thin and elongated dielectric plate 1
A ground electrode 14 is formed on one main surface of the electrode 3, and a plurality of capacitor electrodes 15 are formed on the main surface opposite thereto at the same pitch as the connecting conductor 7. A part of each capacitive electrode 15 is connected to the connecting conductor 7 The ground electrode 14 is connected to the tip of the ground conductor 16 formed on the inner surface of the housing 5 as shown in FIG. It is supported so that it extends parallel to the

That is, the capacitor 12 is connected so as to protrude from the end of the connecting conductor 7 and the printed circuit board 6, and the lead wire 2a of the coil 2 and the capacitive electrode 15 of the capacitor 12 are connected via the connecting electrode 7. .

In this way, the inductance element 3 and the capacitor 12 are connected via the connecting conductor 7 to form a lumped constant type delay line having a plurality of sections.

Returning to FIGS. 1 and 2, input/output terminals 17, 18 and input/output ground terminals 19, 20 are implanted at the bottom of the casing 5.

Ground conductor 1 is connected to input/output ground terminals 19 and 20.
6 is connected to the output terminal 18, and the fixed contact 8 at one end of the fixed contact array 9 is connected to the output terminal 18.

A conductive plate 21 is attached to the opening of the housing 5 so as to close the opening, and the conductive plate 21 is connected to the input terminal 17. A recess 22 is formed in the conductive plate 21 along the fixed contact row 9.

A spring holder 24 is disposed between the recess 22 and the fixed contact row 9 so that its upper portion protrudes from a sliding groove 23 formed in the recess 22 along the fixed contact row 9.

A sliding spring 25 curved into a bow shape is housed in the spring holder 24 . Sliding spring 25
The movable contact 26 has both ends slidably in contact with the conductive plate 21 and is curved and bulged.
Each fixed contact 8 in the fixed contact row 9 and both adjacent fixed contacts 8 are brought into elastic contact, thereby forming movable contact means.

Knob 27 attached to the top of the spring holder 24
When the sliding spring 2 is moved along the sliding groove 23, the sliding spring 2
5 is accompanied by a biasing force due to its elastic deformation force,
Single contact between each fixed contact 8 and movable contact 26;
It moves on the fixed contact row 9 while repeating multiple contacts with both adjacent fixed contacts 8 and movable contacts 26.

Therefore, the input terminal 17 is connected to any fixed contact 8 via the conductive plate 21, the sliding spring 25, and the movable contact 26.

Note that, since the movable contact 26 is biased with respect to the fixed contact 8, as the spring holder 24 moves, the movable contact 26 repeatedly falls between the fixed contacts 8 and into the cut groove 11 at the fixed contact 8. Therefore, an operational feeling such as a clicking sound can be obtained, and the contact between the movable contact 26 and the fixed contact 8 can be ensured.

The variable delay line configured in this way is connected to the coil 2.
Since the lead wire 2a from the capacitor 12 is soldered and connected along one end of the connecting conductor 7, and the capacitor electrode 15 of the capacitor 12 is soldered and connected along the other end of the connecting conductor 7, each connection is easy. and reliable.

That is, after the lead wire 2a is soldered to one end of the connecting conductor 7, the capacitor 12 can be stacked and soldered such that the capacitor electrode 15 is aligned with the other end of the connecting conductor 7, and the capacitor electrode is placed on a flat surface. 1
5 can be easily connected, and it is difficult to melt the solder in the already soldered parts.

Next, the operation of the variable delay line of the present invention will be briefly explained. Note that FIG. 3 is an equivalent circuit diagram of the variable delay line configured in this manner.

The input signal from the pulse signal source PG is transmitted to the conductive plate 2.
1 and the movable contact 26, etc., to the fixed contact 8, and from the input point, the energy is divided into two and propagated both to the left and right in the figure. The signal propagated to the right side is output from the output terminals 18 and 20 after a delay time equal to the delay time td for one section multiplied by the number of sections on the right side from the input point, and is absorbed by the terminating resistor RL as a load.

Therefore, by moving the knob 27 shown in FIG. 1 and sliding the movable contact 26, the output terminals 18,
The delay time of the output signal from 20 can be changed.

On the other hand, the signal propagated to the left side of the delay line also reaches the housing 5 after a delay time multiplied by the number of sections on the left side from the input point.
It is consumed by the resistance Ro within.

In the embodiment described above, an example was shown in which the lead wire 2a and the capacitor electrode 15 were connected to parallel opposing ends of the connection conductor 7. However, in the present invention, the connecting conductor 7
, the connection point between the lead wire 2a of the coil 2 in the adjacent section and the connection conductor 7 and the capacitor 12
The object of the present invention can be achieved by configuring the capacitor electrode 15 and the connection point of the connection conductor 7 to be separated from each other.

Although the coil 2 of the inductance element 3 was formed by winding the conducting wire in a single-layer solenoid shape in the above example, it is also possible to use a spiral winding wire or a multilayer winding wire, and a bobbin is not essential. A conventionally known conductor can also be used for the conductor.

Furthermore, the present invention can also be implemented in an induction m-type delay line in which a plurality of delay line units are connected in cascade, for example, a ferrite drum core is wound, and a tap is pulled out from the middle of the winding to connect a capacitor.

Furthermore, the movable contact means may be one that slides by alternately repeating single contact with each fixed contact and double contact with adjacent fixed contacts, or one that simply repeats single contact.

As explained above, the variable delay line of the present invention connects the connection points of the coils in adjacent sections and the capacitance electrodes of the capacitors with a connection conductor that also serves as a fixed contact, which improves productivity and quality. is possible.

[Brief explanation of the drawing]

1 and 2 are a front sectional view and a side sectional view showing one embodiment of the variable delay line of the present invention, and FIG.
The figure shows the equivalent circuit diagram of the variable delay line shown in Fig. 1, and the equivalent circuit diagram of the variable delay line shown in Fig.
This figure is a partial perspective view showing the connection configuration of the coil and capacitor shown in FIG. 1. 1... Bobbin (non-magnetic plate bobbin), 2... Coil, 3... Inductance element, 5... Housing, 6
... Insulating board (printed circuit board), 7 ... Connection conductor,
8... Fixed contact, 12... Capacitor, 15...
Capacitive electrode, 21... Conductive plate, 24... Spring holder, 25... Movable contact means (sliding spring), 26...
...Movable contact means (movable contact).

Claims (1)

[Claims for Utility Model Registration] A plurality of coils formed by winding conductors are connected in series, and each of the plurality of connection conductors, which are formed on an insulating plate disposed so as to pass over these coils and also serves as a fixed contact, is connected to the coil. A variable delay line in which connection points of coils in adjacent sections are connected, capacitance electrodes of a capacitor are connected to each of the connection points, and movable contact means that moves in contact with the fixed contact is arranged, A variable delay line characterized in that the connection point and the capacitor electrode are connected to one end of the connection conductor and an end remote therefrom.