JPH07282881A - Spring connector - Google Patents

Abstract

PURPOSE:To stabilize contact resistance against the applied external pressure or the change of the external pressure direction by bringing a moving terminal into elastic contact with a contact fin via the gap between the inner diameter of a rod-like member and the moving terminal outer shape smaller than the inner diameter. CONSTITUTION:When a moving terminal 7 is stored in a conducting contact pin 1, a contact fin 14 provided in the pin 1 is brought into pressure contact with the terminal 7. Even if some external pressure P is applied to the terminal 7 from any direction, the fin 14 is invariably kept in contact with the pin 1 because of its elasticity. The partial pressure generated on a plate-like elastic body deformed into a bow shape by pressing acts to keep the terminal 7 in contact with the pin 1. The terminal 7 is brought into elastic contact with the contact fin 14 via the gap of the moving terminal outer shape smaller than the inner diameter of a rod-like member 2, and stable contact resistance is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a point contact type spring connector.

[0002]

2. Description of the Related Art FIG. 6 shows, for example, Japanese Utility Model Application No. 61-11869.
FIG. 7 is a vertical cross-sectional view of an example of a conventional conductive contact pin shown in Japanese Patent Publication No. 3 and, FIG. 7 is a diagram showing how the contact resistance value changes in a conventional spring connector. In FIG. 6, a conductive contact pin 1 has a fixed terminal 3 having a diameter smaller than the outer diameter of the round bar at one end of a bar member 2 of a conductive solid metal round bar.
Are integrally formed by providing a step 4 on the same axis. Furthermore, from the other end of the rod-shaped member 2 to the hole 5 having the first inner diameter in the axial direction
Is drilled to a predetermined depth l near the step 4. A recess 6 having a diameter smaller than the first inner diameter is formed at the bottom of the hole 5. In addition, the conductive movable terminal 7
Has an outer diameter slightly smaller than the first inner diameter of the hole 5, one end of which is formed with a projection 8 having a diameter smaller than the outer diameter in the axial direction, and the other end is axially the same as the recess 6 of the rod-shaped member 2. A recess 9 having a diameter is formed. The movable terminal 7 is the rod-shaped member 2
The projection 8 is fitted in the opening of the hole 5 so as to be slidable in the axial direction so as not to come out outward. The movable terminal 7 is configured so as not to slip out by crimping the opening edge of the rod-shaped member 2 to slightly close the opening, and the movable terminal 7 is slidably contacted with the inner periphery of the hole 5 of the rod-shaped member 2 to prevent both of them. Has electrical continuity. Further, between the recess 6 of the rod-shaped member 2 and the recess 9 of the movable terminal 7, a coil spring 10 whose end portions are inserted and positioned is contracted, and is elastically biased in the direction in which the movable terminal 7 comes out. ing.

In such a structure, the fixed terminal 3 is integrated with the rod-shaped member 2 and can be easily inserted into the hole 12 of the mounting board 11, and the step 4 comes into contact with the surface of the mounting board 11 to regulate the posture. It is fixed in the correct posture. Also,
Even if the coil spring 10 resonates with respect to the slight vibration of the contact terminal 13 that contacts the movable terminal 7, the fixed terminal 3 and the rod-shaped member 2 do not move together, and the fixed terminal 3 deviates from the mounting substrate 11. There is no fear.

FIG. 7 is a graph showing the variation result of the contact resistance value when an instantaneously varying external pressure is constantly applied to a movable terminal of a conventional spring connector having such a structure for a certain period of time. In the figure, 1 is a lower limit value indicating a stable contact resistance in a conductive state, 2 is an upper limit value indicating a maximum fluctuation range of the contact resistance value, and 3 is a fluctuation range. In the conventional spring connector, when the movable terminal 7 slides in the conductive contact pin 1, the movable terminal and the conductive contact pin do not always maintain the contact state, and as a result, the conductive path is from the movable terminal to the coil spring. A first electrical path in which a path that leads to the contact pin via the movable terminal and a path that directly leads from the movable terminal to the contact pin are connected in parallel, and a second electrical path that leads from the movable terminal to the contact pin via the coil spring are configured. . As described above, when the second electric path is formed, the resistance value becomes much larger than that in the case of the first electric path. The state is shown in FIG. 7 as the stable contact resistance value 1 and the fluctuation range 3 You can understand by comparing. Further, the external pressure applied to the movable terminal and the direction of the external pressure change instantaneously, and as a result, the contact pressure between the movable terminal and the conductive contact pin fluctuates, and the first electric path and the second electric path are extremely short-term. In the situation where it switches to
Noise as shown by 4 in FIG. 7 is generated.

[0005]

Since the conventional spring connector is constructed as described above, the contact state between the movable terminal and the conductive contact pin cannot always be maintained in a stable state, and therefore the movable connector is not movable. There is a problem that a plurality of conductive paths having different electric resistances are formed between the terminals and the conductive contact pins. In addition, a change in the external pressure applied to the movable terminal in an instant or a change in the direction of the external pressure changes the contact pressure between the movable terminal and the conductive contact pin, thereby forming a plurality of conductive paths, which is extremely short-term. If these conductive paths having different electric resistances are switched to each other, there is a problem that noise may be generated in the signal line.

The present invention has been made to solve the above problems, and an object thereof is to obtain a spring connector having a stable contact resistance against a change in external pressure applied or a change in the direction of external pressure. It is what Further, it is intended to obtain a spring connector having a low contact resistance value.

[0007]

In the spring connector according to the first aspect of the present invention, a hole having a first inner diameter is bored at a predetermined depth in the axial direction from one end of a conductive rod-shaped member. A concave portion having a diameter smaller than the first inner diameter is formed in the bottom portion, a projecting portion projects from the opening portion of the hole, and a movable terminal having an outer diameter smaller than the first inner diameter is not pulled out of the opening portion. Thus, the spring connector is formed by slidingly fitting the rod-shaped member in the axial direction, inserting one end into the recess of the rod-shaped member, and housing the rod-shaped member so that the coil spring is contracted by the sliding motion of the movable terminal. The elastic contact fin is formed integrally with the rod-shaped member on the inner wall of the hole formed in the conductive rod-shaped member.
In the spring connector according to the second aspect of the present invention, a hole having a first inner diameter is bored from one end of a conductive rod member to a predetermined depth in the axial direction, and a diameter smaller than the first inner diameter is provided at the bottom of the hole. Is formed in the axial direction of the rod-shaped member so that the projecting portion projects from the opening of the hole and the movable terminal having an outer shape smaller than the first inner diameter is not pulled out of the opening. A spring connector in which a coil spring is contracted by a sliding motion of a movable terminal by slidably fitting and inserting one end into a recess of a rod-shaped member to accommodate the spiral spring. It is adapted to be connected to the movable terminal while maintaining its shape.

In the spring connector according to the third aspect of the present invention, a hole having a first inner diameter is bored at a predetermined depth from one end of a conductive rod member, and a protrusion is formed at the opening of the hole. A spring connector in which a movable terminal having an outer diameter smaller than a first inner diameter is fitted in a rod-shaped member so as to be slidable in the axial direction so as not to be pulled out to the outside of the opening. Is configured to be curved by the sliding motion of the bottom portion of the rod-shaped member and the movable terminal, and a linear step is provided on the contact surface between the movable terminal and the rod-shaped member. The spring connector according to the fourth invention is
A hole having a first inner diameter is bored in a predetermined depth from one end of the conductive rod-shaped member in the axial direction, and a recess having a diameter smaller than the first inner diameter is formed at the bottom of the hole, and the opening of the hole is formed. The movable terminal having the outer diameter smaller than the first inner diameter is protruded from the opening and is slidably fitted in the axial direction of the rod-shaped member so as not to be pulled out of the opening. A spring connector having a coil spring contracted by a sliding motion of a movable terminal by inserting one end into a recess to accommodate the coil spring by using a second coil spring means having a low resistance value. It is formed so as to be coaxial.

[0009]

In the spring connector according to the present invention, the movable contact terminal and the conductive contact pin can be constantly pressed by the elastic contact fins formed integrally with the conductive contact pin. Further, in the spring connector according to the present invention, the contact ends of the coil spring and the movable terminal are made to match the terminal shape of the coil spring, so that the partial pressure generated with respect to the spring pressure makes contact between the movable terminal and the conductive contact pin. Can be applied to. Further, since the spring connector in this invention is provided with the plate-shaped elastic body,
The partial pressure generated in the plate-like elastic body that is deformed into an arc shape due to the pressing can be applied so that the movable terminal and the conductive contact pin come into contact with each other. Further, in the spring connector according to the present invention, since the conductive spring having a low electric resistance value is provided in addition to the coil spring, the contact resistance value can be reduced.

[0010]

【Example】

Example 1. A first embodiment of the present invention will be described below with reference to FIGS. 1 and 5. In the figure, reference numeral 14 is a contact fin provided on the conductive contact pin 1, and the portions denoted by the same reference numerals as in the conventional example indicate the same or corresponding portions. Next, the operation will be described. When the movable terminal 7 is housed in the conductive contact pin 1, the contact fins 14 provided on the conductive contact pin 1 are pressed into contact with the movable terminal 7. Further, as shown in the figure, the contact fin 14 is always in contact with the conductive contact pin 1 because of its elasticity, regardless of any direction of external pressure P applied to the movable terminal, and therefore stable. Contact resistance can be obtained. FIG. 5 is a graph showing the fluctuation range of the contact resistance value when an external pressure that fluctuates instantaneously is constantly applied to the movable terminal 7 of the spring connector in this embodiment for a certain fixed period. In the figure, 1 is a stable contact resistance value, 2 is an upper limit value, and 3 is a fluctuation range of the contact resistance value. Here, in comparison with FIG. 7 showing the fluctuation range of the contact resistance value when an external pressure that fluctuates instantaneously is applied to the movable terminal 7 of the conventional spring connector,
When the fluctuation width / stable contact resistance value is obtained, it can be seen that this value is 30% or more in the conventional example, while it is suppressed to 30% or less in the present example.

Embodiment 2. A second embodiment of the present invention will be described below with reference to FIG. In the second embodiment, no spiral is provided at the contact end between the coil spring 10 and the movable terminal 7, and the spiral terminal 15 is used. Reference numeral 20 denotes a contact point between the movable terminal 7 and the conductive contact pin 1, and here, the portions denoted by the same reference numerals as in the conventional example indicate the same or corresponding portions. Next, the operation will be described. The contact end between the coil spring 10 and the movable terminal 7 has a spiral end 15
By doing so, as shown in FIG.
Can be tilted along the terminal shape of the coil spring, and the movable terminal 7 and the conductive contact pin 1 can always be brought into contact with each other at some point 20. This is shown in Fig. 2 (b).
By not providing the end turn as shown in Fig. 5, the spring pressure F becomes F in the opposite direction according to the inclination angle of the coil spring end.
This is because the voltage is divided as 1, F2, and the divided force acts so as to positively bring the movable terminal 7 and the conductive contact pin 1 into contact with each other.

Embodiment 3. The third embodiment of the present invention will be described below with reference to FIG. In the figure, 16 is a plate spring, 17 is a linear step provided on the movable terminal 7,
0 is a contact point between the movable terminal 7 and the conductive contact pin 1. In addition, the same reference numerals as those in the conventional example indicate the same or corresponding portions. Next, the operation will be described. When the movable terminal 7 is pressed, the movable terminal tilts and contacts the conductive contact pin 1
However, the linear step portion 17 provided on the movable terminal acts so that the plate spring 16 forms an arc shape. At this time, a partial pressure acts on the arc center side of the arcuate leaf spring, and this partial pressure positively presses the conductive contact pin 1 through the contact point 20 through the contact point 20, so that the contact resistance value. Can be stabilized.

Embodiment 4. Hereinafter, a fourth embodiment of the present invention will be described with reference to FIG. In the figure, 18 is formed coaxially with the coil spring 10, and is provided with a conduction spring for stabilizing the electrical connection between the conduction contact pin and the movable terminal by applying a resistance lowering treatment such as gold plating, This is a guide for preventing the coil spring 10 and the conduction spring 18 from being entangled. Also, the parts given the same reference numerals as in the conventional example indicate the same or corresponding parts. Next, the operation will be described. By incorporating a conduction spring, the movable terminal 7 is connected to the conduction contact pin 1
As a conduction path up to, a first pattern directing from the movable terminal 7 to the conduction contact pin 1 as shown in FIG. 4A, and a conduction spring 18 and a coil spring from the movable terminal 7 as shown in FIG. 4B. A second pattern is conceivable, which goes through 10 to the conductive contact pin. Here, if the conduction spring resistance value in the case of the second pattern is R1 and the resistance value of the coil spring is R2, the total resistance value R is R =
It becomes R1R2 / (R1 + R2). Coil spring R
2 has a large resistance value and the conduction spring R1 has a very small resistance value, so that the total resistance value R becomes very small. Therefore, even if the switching between the two conductive path patterns occurs, the change of the contact resistance value becomes very small. Also,
Considering that a large deflection load of the spring affects the movement of the movable terminal, the conduction spring is built in to reduce the resistance value.
The smaller the deflection load of the conduction spring, the more desirable.

[0014]

As described above, according to the first aspect of the present invention, the movable terminal and the conductive contact pin are pressed by the elastic contact fins formed integrally with the conductive contact pin. There is an effect that a stable spring connector can be obtained. According to the second aspect of the invention, the contact ends of the coil spring and the movable terminal are matched with the terminal shape of the coil spring, so that the movable terminal presses the partial pressure generated with respect to the spring pressure to the conductive contact pin. It is possible to work in any direction, and the same effect as the first aspect of the invention can be obtained. Further, according to the third aspect of the invention, since the plate-shaped elastic body is provided, a partial pressure is generated in the direction in which the movable terminal presses the conductive contact pin on the plate-shaped elastic body that is deformed into an arc shape by pressing. It is possible to achieve the same effect as the first invention. Further, according to the fourth aspect of the invention, since the conductive spring having a low electric resistance value is provided in addition to the coil spring, there is an effect that a spring connector having a low contact resistance value can be obtained.

[Brief description of drawings]

FIG. 1 is a diagram showing a spring connector according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a spring connector according to a second embodiment of the present invention.

FIG. 3 is a diagram showing a spring connector according to a third embodiment of the present invention.

FIG. 4 is a diagram showing a spring connector according to a fourth embodiment of the present invention.

FIG. 5 is a graph showing the measurement results of the contact resistance value of the spring connector according to the present invention.

FIG. 6 is a vertical cross-sectional view of a conventional spring connector.

FIG. 7 is a graph showing a measurement result of a contact resistance value of a conventional spring connector.

[Explanation of symbols]

 1 Conductive Contact Pin 2 Rod-shaped Member 3 Fixed Terminal 4 Step 5 Hole 6 Recess 7 Movable Terminal 8 Projection 10 Coil Spring 14 Contact Fin 15 Terminal 16 Plate Spring 17 Linear Step 18 Conductive Spring 19 Guide

Claims (4)

[Claims] 1. A hole having a first inner diameter is bored from one end of a conductive rod member to a predetermined depth in the axial direction, and a recess having a diameter smaller than the first inner diameter is formed at the bottom of the hole. , A protrusion protruding from the opening of the hole, and a movable terminal having an outer shape smaller than the first inner diameter is slid in the axial direction of the rod-shaped member so as not to be pulled out of the opening. A spring connector, which is movably fitted and accommodated by inserting one end into a concave portion of the rod-shaped member so that a coil spring is contracted by a sliding motion of the movable terminal, wherein the conductive rod-shaped member is provided. A contact fin that is integrally formed with the rod-shaped member on the inner wall of the hole and that elastically abuts the movable terminal through a gap between the first inner diameter of the rod-shaped member and the outer shape of the movable terminal smaller than the inner diameter; Which is characterized by Ring connector. 2. A hole having a first inner diameter is bored in a predetermined depth from one end of a conductive rod-shaped member, and a recess having a diameter smaller than the first inner diameter is formed at the bottom of the hole. , A protrusion protruding from the opening of the hole, and a movable terminal having an outer shape smaller than the first inner diameter is slid in the axial direction of the rod-shaped member so as not to be pulled out of the opening. A spring connector, which is movably fitted and accommodated by inserting one end into a recess of the rod-shaped member to retract the coil spring by the sliding motion of the movable terminal, wherein one end of the coil spring is A spring connector characterized by being connected to a movable terminal while holding a spiral shape. 3. A hole having a first inner diameter is bored from one end of a conductive rod-shaped member in the axial direction to a predetermined depth, and a protrusion is projected from the opening of the hole and the first portion is formed. In a spring connector in which a movable terminal having an outer diameter smaller than the inner diameter of 1 is fitted slidably in the axial direction of the rod-shaped member so as not to be pulled out of the opening, a plate-shaped elastic member is attached to the rod-shaped member. A spring connector characterized in that it is curved by a sliding motion of a bottom portion and the movable terminal, and a linear step is provided on a contact surface between the movable terminal and the rod-shaped member. 4. A hole having a first inner diameter is bored axially from one end of a conductive rod member to a predetermined depth, and a recess having a diameter smaller than the first inner diameter is formed at the bottom of the hole. , A protrusion protruding from the opening of the hole, and a movable terminal having an outer shape smaller than the first inner diameter is slid in the axial direction of the rod-shaped member so as not to be pulled out of the opening. A spring connector that is movably fitted and has one end inserted into a recess of the rod-shaped member to be housed so that a coil spring is contracted by the sliding motion of the movable terminal. By providing the second spring means formed in the second spring means, and by configuring the second spring means to have a low resistance value, the contact resistance value between the rod-shaped conductor and the movable terminal is lowered. Characteristic Pulling connector.