JPH04544Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Technical field The present invention relates to an improvement in the structure of a terminal connected to two different circuits.
For example, the present invention relates to a two-contact type terminal that can be applied to a voltage supply terminal and a voltage detection terminal used in remote sensing of a DC stabilized power supply, or a current supply terminal and a voltage detection terminal used in a four-contact resistance measurement circuit.

(b) Prior art When supplying power from a DC stabilized power source to a load, if the distance from the power source to the load is long,
Due to the voltage drop caused by the internal resistance of the power supply line that supplies power, an error equal to the voltage drop occurs between the voltage at the load end and the input voltage of the error amplifier. out of control. Therefore, as shown in FIG. 10, a remote sensing method is generally used in which a voltage supply line 50 as a power supply line and a voltage detection line 51 as a remote sensing line for detecting the voltage across the load R _L are wired independently. It is used in and voltage supply line 5
A voltage supply terminal 52 and a voltage detection terminal 53 are provided independently as terminals for connecting the voltage detection line 51 and the voltage detection line 51 to the load _RL .

In addition, FIG. 11 is an equivalent circuit of FIG. 10, where r ₀ is the internal resistance of the voltage supply line 50, and r ₁ is the internal resistance of the voltage detection terminal 5.
The combined resistance of the contact resistance at 3 and the internal resistance of the voltage detection line 51, _r2 is the contact resistance at the voltage supply terminal 52, and 54 has an extremely large input impedance (for example, about 100 MΩ) compared to the load R _L. An error amplifier 55 is a variable power supply controlled by the error amplifier 54, and this variable power supply 55
and an error amplifier 54 constitute a DC stabilized power supply.

According to the remote sensing method mentioned above, the load
Although the voltage across R _L can be controlled accurately, in applications where the load R _L is frequently replaced, it is necessary to connect the four terminals each time the load R L is replaced, resulting in poor work efficiency and There was a problem that the space for arranging the equipment was inefficient.

To solve this problem, a method can be considered in which the voltage detection line 51 is connected to the voltage supply line 50 near the voltage supply terminal 52, as shown in FIG. However, when connected in this way, the number of terminals to be connected is reduced by half, but the contact resistance at the voltage supply terminal 52 is reduced as shown in the equivalent circuit shown in FIG.
r ₂ is added to the load R _L , and the problem remains that the voltage across the load R _L cannot be accurately measured.

By the way, when measuring low resistance by the four-contact resistance measurement method (hereinafter referred to as the "voltage drop method"), the circuit shown in FIG. 14 is generally used.

In the figure, 50' is a current supply line, 51' is a voltage detection line, 52' is a current supply terminal, 53' is a voltage detection terminal, R _X is a resistance to be measured, and 56 is a voltmeter with high input impedance. (for example, a millivolt meter or digital multimeter), and 57 is a constant current source. FIG. 15 shows this fourteenth equivalent circuit. In this case, as in the case of the remote sensing method described earlier, the voltage across the resistor under _{test R}
It has poor workability when used for replacing parts, and is a factor that hinders efficiency in manufacturing inspection work, etc.

To eliminate this problem, as shown in FIG.
It is considered that it is sufficient to connect the voltage detection line 51' to 0'. However, with such a circuit configuration, as shown in the equivalent circuit of FIG. 17, there is a problem in that the contact resistance r ₂ at the current supply terminal 52' becomes an error and is added to the resistance to be measured R _X , making it impossible to make accurate measurements. It was hot.

Therefore, conventionally, in order to reduce the contact resistance r ₂ in FIGS. 13 and 17, the contact surfaces of the voltage supply terminal 52 and the current supply terminal 52' in FIGS. etc.), plating with precious metal, widening the area of the contact surface, or tightening the voltage supply terminal 52 and current supply terminal 52' strongly to increase the contact pressure. However, none of these solutions could be considered to essentially solve the problem.

(c) Purpose The present invention was developed in view of the above-mentioned problems, and its purpose is to improve the efficiency of connection work to terminals and the space efficiency of terminal arrangement.
Another object of the present invention is to provide a two-contact terminal that is less susceptible to electrical errors due to contact resistance in the terminal.

(d) Structure In order to achieve the above object, the present invention provides electrically insulated conductors that are electrically insulated from each other via an insulator and are arranged close to each other so that the connected conductors, which are the ends of the resistor, can contact at the same time. and a holding means for removably maintaining the contact state between the first and second conductors and the connected conductor; One and the other of the pair of connected power supply wires are fixedly connected to the first conductor of the pair of terminals, respectively, and one and the other of the pair of voltage detection wires connected to the voltage detection means are fixedly connected to the first conductor of the pair of terminals. The resistor is fixedly connected to the second conductor, and the connected conductors at both ends of the resistor are held in contact with the first and second conductors by respective holding means of the pair of terminals. The present invention is characterized in that it is configured such that the voltage across both ends of the voltage can be detected by the voltage detection means.

Hereinafter, the gist of the present invention will be explained in detail based on examples.

FIG. 1 is a partially exploded longitudinal sectional side view showing the main structure of a first embodiment of a two-contact terminal according to the present invention, and FIG. 2 is a perspective view of the first embodiment. First, to explain the structure, 1 is a roughly cylindrical knob made of insulating resin, 2 is an upper contact member as a first conductor made of metal that is partially embedded in the knob 1, and 3 is the second part made of metal
A holder part made of insulating resin integrally holds the lower contact 4 as a conductor and the upper contact receiving member 5 made of metal as well, and 6 is made of metal for attaching the holder part 3 to a housing etc. This is a mounting nut consisting of: The upper contact member 2 includes a shaft portion 7, a screw portion 8, a contact portion 9, and an embedded portion 10. That is, a threaded portion 8 is formed over a predetermined length at the tip of the shaft portion 7, and a cylindrical embedded portion 10 having a larger outer diameter than the shaft portion 7 is formed concentrically with the shaft portion 7 at the other end. It is embedded and fixed within part 1. Further, the contact portion 9 is a disc-shaped member formed concentrically with the shaft portion 7, and the proximal half thereof is embedded in the knob portion 1, and the tip end of the contact portion 9 that is not embedded in the knob portion 1. An annular projection 9a projects from the side half, and a contact surface 9b with the conductor to be connected is formed on the lower surface of the annular projection 9a in the figure. The lower contact 4 is a cylindrical member, and is used to connect a contact surface 4a that contacts a conductor to be connected (for example, a lead of a resistor to be measured, etc.) and a connection lead wire (for example, a fixed connection by soldering, etc.). The piece 4b protrudes to the outside of the holder portion 3. The upper contact receiving member 5 has a shaft portion 11, a connecting end portion 12, and a threaded portion 13 formed as a pair. That is, the upper contact member 2 is disposed on the inner periphery of the threaded portion 13.
A female thread 13a is screwed into the threaded part 8 of the shaft part 11, and one end of the shaft part 11 that is not embedded in the holder part 3 has a cylindrical connecting end slightly larger than the outer diameter of the shaft part 11. 12 is formed, and a tapered part 11a is formed at the intermediate part embedded in the holder part 3, and a tapered part 13b is formed at the upper peripheral edge of the threaded part 13 in the figure. The holder part 3 has a cylindrical shape with different outer diameters, and has a threaded part 8 at the center of the upper end surface.
A hole for inserting the holder part 3 is drilled in the axial direction.
A male screw 14 that is screwed into the mounting nut 6 is screwed onto the outer periphery of the cylinder having a small outer diameter. Further, 15 is a contact surface with a chassis, a housing, or the like. A female screw 6a is screwed onto the inner periphery of the mounting nut 6 and is screwed into the male screw 14. Incidentally, the upper contact member 2 and the upper contact receiving member 5 have a function as a first conductor, and they are also connected to the knob part 1 and the holder part 3.
It also functions as a holding means for maintaining the contact state between the connected conductor and the first and second conductors.

FIG. 3 is a longitudinal cross-sectional side view showing a partially exploded main part configuration of a second embodiment of a two-contact terminal according to the present invention;
FIG. 4 is a perspective view of FIG. 3. First, to explain the configuration, 20 is a knob part, 21 is a holder part, 2
2 is a mounting nut. Furthermore, the holder part 21
is composed of a first contact 23 as a first conductor, a second contact 23' as a second conductor, and a threaded member 24 functioning as the holding means. The knob portion 20 is composed of a head 25 made of a cylindrical insulating resin having a tapered outer periphery, and a connecting member 26 integrally formed of a metal material.The connecting member 26 includes a screw portion 26a, Consisting of a shaft portion 26b and an embedded portion 26c, the embedded portion 26c and the shaft portion 2
A portion of 6b is embedded and fixed within the head 25.

The holder part 21 is made of a cylindrical insulating resin having different outer diameters, a first contact 23 and a second contact 23' are arranged symmetrically about the center line of the cylinder, and a screw member 24 is arranged on the center line. , the embedding is fixed. Since the first contact 23 and the second contact 23' are exactly the same, only the first contact 23 will be explained.
One end surface forms a contact surface 23a having an arcuate cross section, and the other end surface decreases in width as it goes downward in the figure to form a narrow plate-shaped part 23b, which extends further downward in the figure. Protruding from the holder part 21, the connecting piece 2
3c is formed. The threaded member 24 is made of a thick cylindrical metal, and has a female thread 24a screwed onto the inner periphery thereof to be threaded into the male thread of the threaded portion 26a. The holder part 21 consists of a head part 27 and a neck part 28 having a smaller outer diameter than the head part 27, and a male screw 28a screwed into the outer periphery of the neck part 28 is screwed into the female screw 22a of the mounting nut 22. . The head 27 also has an insertion hole 27 bored at the center of the upper end surface 27a.
b, and a contact surface 27d between a guide piece 27c protruding from the outer peripheral edge of the head 27 in a direction substantially orthogonal to the direction in which the first contact 23 and the second contact 23' are opposed, and the chassis, casing, etc. It has In addition, the first contact 23
The outer diameter of the partially broken circle formed by the contact surfaces 23a and 23'a of the second contact point 23' and the second contact point 23' and the maximum outer diameter of the head 25 of the knob part 20 are formed to have approximately the same dimensions. . Furthermore, a female screw 22a is screwed into the inner peripheral portion of the mounting nut 22 and is screwed into the male screw 28a of the holder portion 21.

FIG. 5 is a perspective view showing the configuration of main parts of a third embodiment of the two-contact type terminal according to the present invention. 30 is a knob made of insulating resin, 31 is a first contact made of metal, 31' is a second metal contact that is symmetrical to the first contact 31, and 32 is made of insulating resin, which connects the first contact 31 and the second contact. A holder part that fixes and holds the contact 31' in an insulated state, 33 is a lead wire of the first contact, 33'
are the lead wires of the second contact, and are connected to the holder part 3, respectively.
2, and is connected to a first contact 31 and a second contact 31'. Note that 34 is a conductor to be connected (for example, a lead wire of a resistor, etc.). The knob part 30 has a cylindrical shape, and has a tapered prepared hole whose inner diameter decreases upward in the figure from the lower end surface, and a female screw 35 is screwed into the inner periphery of this prepared hole. . First contact 31
, a rectangular parallelepiped-shaped contact portion 36 and a truncated semi-conical portion 37
A contact surface 36a with the conductor 34 to be connected is formed on one side of the rectangular parallelepiped of the contact portion 36, and a contact surface 36a with the connected conductor 34 is formed on one side of the rectangular parallelepiped of the contact portion 36, and a portion of the contact surface 36a slightly above the center in the longitudinal direction in the drawing is provided with a contact surface 36a in the longitudinal direction. A protrusion 36b is continuously provided to protrude in a direction substantially orthogonal to the direction. A male thread 37a is screwed on the outer periphery of the truncated semi-conical portion 37, and the female thread 35 on the inner periphery of the knob 30 is connected to the male thread 37'a of the truncated semi-conical portion 37 of the second contact 31'. It is configured to be screwed together. Note that a holder mounting portion 38 is integrally formed on two opposing side surfaces of the holder portion 32, and a mounting hole 38a into which a mounting screw (not shown) is inserted is bored.

Next, the assembly and operation of the two-contact terminal configured as described above will be explained.

In the first embodiment shown in FIGS. 1 and 2, first, the side with the smaller outer diameter of the holder part 3 is inserted into the mounting hole of the chassis, etc., and the contact surface 15 is brought into contact with the upper surface of the chassis. It is attached to the chassis by screwing the mounting nut 6 into the male screw 14 and tightening it from the bottom side of the chassis. After that, the female threaded part 13a and the threaded part 8 are screwed together, the conductor to be connected is placed so that it contacts at least one place on the contact surface 4a, and as the knob part 1 is further turned, the contact surface 9b also becomes the same as above. Contact the other surface of the connected conductor. This contact state is maintained by further strongly turning knob 1 in the same direction. At this time, for the connected conductor,
Now that the lower contact 4 and the contact part 9 are in contact at the same time, the current supply line 50' as a power supply line is connected to the connection piece 4b, and the voltage detection line 51' as a signal line is connected to the connection end 12. When connected, the circuit shown in FIG. 6 will be obtained. Note that FIG. 6 will be explained in detail later.

Next, in the second embodiment shown in FIGS. 3 and 4, first, the neck part 28 of the terminal is inserted into the mounting hole of the chassis, etc., and the upper surface of the chassis and the contact surface 27d are brought into contact with each other. Screw the mounting nut 22 onto the male thread 28a and tighten firmly. After that, connect the conductor to be connected between the contact surface 23a of the first contact 23 and the second contact surface 23a.
Place it on both the contact surfaces 23a, 23'a so that it can come into contact with both the contact surface 23'a of the contact 23',
The screw portion 26a and the female screw 24a are screwed together by turning the knob portion 20, and the conductor to be connected is held from above in the figure between the clamping surface 25a and both of the contact surfaces 23a, 2.
3'a to maintain the contact state. Therefore, the connecting pieces 23c and 23'c
A voltage supply line 50 as a power supply line and a voltage detection line 51 as a signal line, or a voltage detection line 5
1' and the current supply line 50' are respectively connected.
The guide piece 27c is for guiding the connected conductor so that it inevitably comes into contact with both the contact surfaces.

In the third embodiment shown in FIG. 5, the conductor 34 to be connected is inserted between the contact surfaces 36a and 36'a, and the tapered female thread 35 on the inner periphery of the knob 30 is connected to the truncated half. By screwing together the male threads 37a screwed into the conical parts 37, 37' and the male thread formed from 37'a, and turning the knob part 30, the connected conductor 34 is connected to both the contact surfaces. It is held between 36a and 36'a to maintain a contact state. Note that the voltage supply line 50 (or current supply line 50') and voltage detection line 51 (or 51') are connected in advance to the first contact lead line 33 and the second contact lead line 33'. shall be kept.

As mentioned above, FIG. 6 is a diagram schematically showing the connection state of the first embodiment of the present invention, and FIG. 7 is a diagram showing the electrical characteristics of FIG. 6 in an equivalent circuit. FIG. 8 is a diagram showing a further organized equivalent circuit. 34 is a conductor to be connected, such as a lead wire of the resistance to be measured R _X , 41 is an upper contact,
Reference numeral 42 denotes a lower contact point, which corresponds to the contact portion 9 and the lower contact point 4 of the first embodiment (first illustration), respectively. 4
1a is the contact surface between the connected conductor 34 and the upper contact 41, and the contact resistance generated at this contact surface 41a is expressed as r ₃
shall be. Further, 42a is a contact surface between the connected conductor 34 and the lower contact 42, and this contact surface 4
Let r ₄ be the contact resistance generated at 2a. In addition, 43
is a voltmeter having a sufficiently higher input impedance than the resistance to be measured R _X , and 44 is a constant current source. However, the internal resistances of the connected conductor 34, upper contact 41, and lower contact 42 are ignored here because they are sufficiently smaller than the contact resistances r ₃ and r ₄ . Therefore, when the circuit diagram shown in FIG. 6 is replaced with an equivalent circuit, FIG. 7 is obtained.
Furthermore, in Fig. 7, the contact resistance r ₃ connected in parallel
If we combine the contact resistance r ₃ and the series-connected r ₁ and replace them with r ₁ ′, and combine the parallel-connected contact resistance r ₄ into one and replace them with r ₂ ′, we get The circuit of FIG. 7 is represented as an equivalent circuit of FIG.

6 and 7 show one of a pair of two-contact terminals according to the present invention, one of a pair of voltage detection wires connected to a voltmeter 43, and a power source (constant current source).
Although only one of the pair of power supply wires connected to the terminal is shown, in actual use, the upper contact 41 and lower contact 42 of the other two-contact terminal are A power supply line is firmly connected, and the other upper contact 41
The other connected conductor of the resistor to be measured R _X is held by a holding member in contact with the contact surface 41 a of the resistor R X and the contact surface 42 a of the other lower contact 42 . An equivalent circuit of such a circuit configuration is shown in FIG. Now, if we compare the equivalent circuit shown in Fig. 8 with the equivalent circuit shown in Fig. 15, which is a conventional resistance measurement circuit using four terminals, we will see that both 44 and 57 are constant current sources. ,
Even if r ₂ ′≠ _{r 2} , _the current flowing through _the resistance to be _{measured R} The effect of this does not appear on the measured voltage. Also,
Both 43 and 56 are voltmeters with sufficiently high _input impedance compared to _the resistance to be _{measured R} The effect of being ₁ does not appear on the measured voltage. Therefore, in the sense of resistance measurement using the voltage drop method, both of the above equivalent circuits are the same.

Furthermore, the two-contact type terminals shown in the second and third embodiments also have electrical characteristics equivalent to those of the first embodiment for the reasons described above.

Next, the voltmeter 43 in FIG.
, the constant current source 44 is connected to the variable power source 46 and the resistance to be measured is connected to the variable power source 46.
If R _X is replaced with a load R _L , the equivalent circuit shown in FIG. 9 is obtained. In other words, the equivalent circuit shown in FIG.
This is a case where the two-contact type terminal according to the present invention shown in Examples to Third Example is used in a remote sensing circuit. In addition, the error amplifier 45 and the variable current 46
The error amplifier 45 is configured to have a sufficiently high input impedance compared to the load _RL . Therefore, when comparing the equivalent circuit shown in Fig. 9 with the equivalent circuit of the conventional remote sensing circuit using four terminals shown in Fig. 11, both 45 and 54 are loads R _L
Since the error amplifier _has an input impedance sufficiently higher _than
Even if the resistance values are different, in practice, the voltages detected by both error amplifiers are the same if the voltages across the load R _L are equal, and the contact resistance r ₂ ′,
Since _r2 is outside the voltage detection point (in the figure), it does not affect the detected voltage. and variable power supply 46,5
5 is controlled by the respective error amplifiers 45 and 54 so that the voltage across the load R _L is constant, so if the output setting voltages are both set to the same value, the voltage across the load R _L are the same in both of the above equivalent circuits. Therefore, it can be said that the above-mentioned equivalent circuits are substantially the same as remote sensing circuits for a DC stabilized power supply. That is, when the two-contact type terminal according to the present invention is used in a remote sensing circuit of a DC stabilized power source, it exhibits electrical characteristics equivalent to those when using four conventional terminals.

On the other hand, when using the two-contact terminal according to the present invention, accurate measurements or operations that could not be performed without using four terminals can now be made possible with two terminals. When mounting on a terminal board or operation panel, the space efficiency of mounting on a terminal board or operation panel is improved, and when the load R _L or the resistance to be measured R _X is frequently replaced (such as during product inspection at a mass production factory) This has the advantage of reducing the number of operations by half, improving work efficiency and reducing man-hours.

Also, as in the case of using two conventional terminals,
There is an advantage that there is no need to use precious metals in the contact portion of the terminal, which saves scarce resources, and also reduces the cost of the terminal itself. Furthermore, since there is no need to tighten the terminal tabs particularly tightly in order to reduce operational errors due to contact resistance, there are advantages in that work efficiency can be further improved and the size can be reduced.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and various modifications can be made without departing from the gist thereof.

For example, voltage detection line 5 of the above two conductors
As long as the condition that the connected conductors 1 and 51' and the conductor to be connected are in direct contact with each other is maintained, the positional relationship, shape, and means for maintaining the contact state between the two conductors and the conductor to be connected can be arbitrarily selected.

(e) Effects As explained in detail above, according to the present invention, the resistors are electrically insulated from each other via an insulator and are arranged close to each other so that the connected conductors, which are the ends of the resistor, can contact at the same time. and a holding means for removably maintaining the contact state between the first and second conductors and the connected conductor; One and the other of the pair of connected power supply wires are fixedly connected to the first conductor of the pair of terminals, respectively, and one and the other of the pair of voltage detection wires connected to the voltage detection means are fixedly connected to the first conductor of the pair of terminals. The resistor is fixedly connected to the second conductor, and the connected conductors at both ends of the resistor are held in contact with the first and second conductors by respective holding means of the pair of terminals. Since the configuration is such that the voltage across the voltage can be detected by the voltage detection means,
When implementing the remote sensing method or the four-contact resistance measurement method, even if you use only two terminals instead of using four terminals as in the conventional method, it is possible to The contact resistance is not inserted into the circuit in the voltage detection line, and is therefore not related to voltage detection at all, and is the contact resistance in the second conductor that connects the connected conductor, which is the end of the resistor, to the voltage detection line. Resistance can be practically ignored by detecting the voltage with a voltage detection means that has a sufficiently high input impedance compared to the resistor.
In addition, as mentioned above, only two terminals are required, which is half the number of conventional terminals, and therefore the number of steps and work time required to connect the conductor to be connected to the terminals is halved, and the terminal installation space on the terminal board, operation panel, etc. is also reduced by half. It is possible to provide a two-contact type terminal that can be significantly downsized, and furthermore, the total cost of the terminal can be significantly reduced because the number of terminals is halved or there is no need to use expensive precious metals for the contact surface.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional side view showing a partially exploded configuration of the main parts of the first embodiment of the present invention, and FIG.
FIG. 3 is a partially exploded perspective view showing the external structure of the embodiment; FIG. 3 is a vertical sectional side view showing the main structure of the second embodiment of the present invention in the same manner; FIG. 4 is the same second embodiment. FIG. 5 is a perspective view showing the main part configuration of the third embodiment of the present invention, and FIG. 6 is a schematic diagram of the connected state in order to explain the operation of the first embodiment. The diagram shown in FIG. 7 is an equivalent circuit diagram of FIG. 6 above,
Figure 8 is an equivalent circuit diagram that is a further arrangement of Figure 7.
Figure 9 is an equivalent circuit diagram when the embodiment of the present invention is used in a remote sensing circuit, Figure 10 and subsequent diagrams are conventional examples, of which Figure 10 is a conventional remote sensing circuit diagram, and Figure 11. is its equivalent circuit diagram, Fig. 12 is a simplified connection diagram of the conventional remote sensing method, Fig. 13 is its equivalent circuit diagram, Fig. 14 is a resistance measurement circuit diagram using the conventional voltage drop method, and Fig. 15 is its equivalent circuit diagram. The figure is its equivalent circuit diagram, and Figure 16 is
FIG. 17, which is a simplified wiring diagram of the voltage drop method described above, is an equivalent circuit diagram thereof. 1, 20, 30...Knob part, 2...Upper contact member, 3,21,32...Holder part, 4...Lower contact, 5...Upper contact receiving member, 6, 22...Mounting nut, 23, 31...first contact, 23', 3
1'...Second contact, 24...Screwing member, 25,2
7... Head, 26... Holding member, 28... Neck,
34...Conductor to be connected, 37...Truncated semi-conical part, 4
1... Upper contact, 42... Lower contact, R _X ... Resistance to be measured, 43, 56... Voltmeter, 44, 57...
... Constant current source, 45, 54 ... Error amplifier, 46,
55...Variable power supply, R _L ...Load, 52...Voltage supply terminal, 52'...Current supply terminal, 53,5
3'... Voltage detection terminal, r ₀ ... Internal resistance, r ₁ , r ₁ ',
r ₂ ′... combined resistance, r ₂ , r ₃ , r ₄ ,... contact resistance.

Claims (1)

[Scope of utility model registration request] first and second conductors that are electrically insulated from each other via an insulator, are arranged close to each other so that the connected conductors, which are ends of the resistor, can contact at the same time, and are connected to different systems; and a holding means that releasably maintains the contact state between the first and second conductors and the connected conductor, and the holding means detachably holds one and the other of the pair of power supply wires connected to a power supply to the pair of the terminals. one and the other of a pair of voltage detection wires connected to the voltage detection means are respectively fixedly connected to the second conductor of the pair of terminals, and both ends of the resistor are fixedly connected to the second conductor of the pair of terminals. The voltage across the resistor can be detected by the voltage detecting means by holding the connected conductors in contact with the first and second conductors by the holding means of the pair of terminals, respectively. A two-contact type terminal characterized by having the following structure.