JP2013246962A - Spring pin type contact and multicore electric connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To arrange a spring pin type contact configured to secure contact with a tube inner circumferential surface by giving bias force to a spring pin in alignment with a bias direction.SOLUTION: A spring pin 3 of a spring pin type contact 1 includes a pin rear end part 31 housed coaxially in a tube 2, and a pin body part 33 projecting from a tip opening part 21 of the tube 2 eccentrically to one side with respect to a center axis 2a of the tube 2. A bias direction of the spring pin 3 by a coil spring is a direction opposite from an eccentric direction, and the bias direction of the spring pin 3 can be easily confirmed by visually recognizing the pin body part 33 of the spring pin 3. Thus, the bias direction of each spring pin type contact 1 can be aligned in the same direction in a multicore electric connector configured so as to arrange many spring pin type contacts 1 in a connector housing.

Description

  The present invention relates to a spring pin type contact in which a spring pin held in a slidable state on a tube is urged forward by a coil spring. More particularly, the present invention relates to an improvement of a spring pin type contact configured to apply a biasing force to press a spring pin against an inner peripheral surface of a tube by a coil spring in order to maintain a conduction state between the tube and the spring pin.

  In a battery mounted on an electronic device such as a mobile phone, a terminal pin called a spring pin, a spring probe pin, a pogo pin or the like (hereinafter referred to as a spring pin) in order to establish a connection with an electrical contact on the electronic device body side. A spring pin type contact with is used. The spring pin type contact has a structure in which the tip side of the spring pin is pushed out from the tip of the conductive tube by a coil spring. A spring pin is pushed in by the contact of the other party, and the state where the contact and the spring pin are reliably connected by the spring force of the coil spring is formed.

  The spring pin is electrically connected to the wiring of the circuit board through a conductive tube. In order to keep the spring pin slidable along the inner peripheral surface of the tube so that it is always in contact with the inner peripheral surface of the tube, a bias force capable of pressing the spring pin against the inner peripheral surface of the tube is applied by the coil spring. Spring pin type contacts that are generated are known. For example, as shown in FIG. 4, in the spring pin type contact 100, the rear end surface of the spring pin 101 is an inclined surface 102 that is inclined with respect to an orthogonal plane orthogonal to the axis 100 a. The inclined surface 102 is urged by the coil spring 103 in the direction of the axis 100a. As a result, a biasing force acts on the spring pin 101 in a direction inclined with respect to the direction of the axis 100 a, and a biasing force is generated to press the outer peripheral surface 104 of the spring pin 101 against the inner peripheral surface 106 of the tube 105. Therefore, even if the spring pin 101 slides in the direction of the axis 100a, the conduction state between them is reliably maintained.

  Patent Document 1 proposes a spring pin connector having this configuration. The spring pin connector disclosed herein employs a configuration in which the outer peripheral surface of the spring pin opposite to the direction in which the bias force acts is cut to be a flat surface. Thereby, when the spring pin is pushed into the tube or the like, the spring pin does not fall down and does not fall into a stack state (biting state) that cannot slide in the protruding direction.

JP 2006-179406 A

  However, the conventional spring pin type contact configured to generate a bias force by a coil spring and press the spring pin against the inner peripheral surface of the tube has the following problems to be solved.

  The spring pin type contact is generally used as a multi-core electrical connector having a configuration in which a large number of spring pin type contacts are arranged in a row. In the conventional spring pin type contact, the bias direction of the spring pin cannot be easily confirmed. For example, it cannot be confirmed visually. For this reason, it is difficult to arrange in the state where the bias direction of each spring pin in the arranged many spring pin type contacts is aligned in the same direction. As a result, the bias direction of each spring pin is different in the state where it is in contact with a number of contacts on the other side, and the load when pushing each spring pin toward the contact on the other side may increase. Also, the contact state of the spring pin with respect to each contact may vary.

  Moreover, in the probe pin connector described in Patent Document 1, the outer peripheral surface of a spring pin that slides in a cylindrical tube is cut to form a flat surface. For this reason, a large gap is formed between the cut portion of the spring pin and the circular inner peripheral surface of the tube. Although the spring pin pushed into the tube does not fall into a stacked state, the amount of backlash in the tube is large, and the spring pin may not slide smoothly. In addition, the variation in the slide resistance of the spring pin also increases. Furthermore, it is not preferable to cut the outer peripheral surface of the spring pin into a flat shape from the viewpoint of securing a contact area with the tube.

  In view of these points, the problem of the present invention is that it is possible to easily confirm the bias direction in the spring pin type contact configured to ensure the contact with the inner peripheral surface of the tube by applying a bias force to the spring pin. An object of the present invention is to ensure the contact between the spring pin and the tube, and to smoothly slide the spring pin.

In order to solve the above problems, the spring pin type contact of the present invention is
A conductive tube;
A conductive spring pin slidable in the direction of its central axis within the tube;
A coil spring that biases the spring pin in the direction of pushing out the spring pin from the tip opening of the tube;
The spring pin includes a cylindrical pin rear end portion and a columnar pin main body portion protruding from a front end surface of the pin rear end portion, and is more external to the pin main body portion than the pin rear end portion. The diameter of the pin body portion is eccentric with respect to the pin rear end portion so that the circular outer peripheral surface of the pin main body portion is inscribed in the circular outer peripheral surface of the pin rear end portion,
The tube includes a cylindrical body portion in which the rear end portion of the pin is slidably housed, and the pin main body portion is slidable at a distal end of the cylindrical body portion with a smaller diameter than the rear end portion of the pin. The tip opening is inserted in a state, and the circular inner peripheral surface of the tip opening is inscribed in the circular inner peripheral surface of the cylindrical trunk. The tip opening is eccentric,
By the coil spring, a biasing force in a direction opposite to the eccentric direction of the pin main body portion with respect to the rear end portion of the pin is applied to the spring pin.

  In the spring pin type contact of the present invention, the pin body portion of the spring pin protruding from the tip opening of the tube is in a state of being eccentric to one side with respect to the central axis of the tube. The bias direction of the spring pin by the coil spring is the direction opposite to the eccentric direction. Therefore, the bias direction of the spring pin can be easily confirmed by visually observing the pin body portion of the spring pin protruding in an eccentric state from the tube. Therefore, when manufacturing a multi-core electrical connector having a structure in which a large number of spring pin contacts are arranged in the connector housing, the bias directions of the spring pin contacts can be aligned in the same direction.

  Further, the pin rear end portion of the spring pin is accommodated coaxially in the cylindrical body portion of the tube and slides in the axial direction thereof. The pin body protruding from the pin rear end is eccentric with respect to the pin rear end. When viewed from the side, the eccentric side surface of the pin body is linear with the side of the pin rear end. It is connected to. Similarly, the end opening of the cylindrical body of the tube is also eccentric with respect to the end of the end of the end of the opening. It is connected to the circumferential side in a straight line. Therefore, on the eccentric side of the pin main body portion, there is no step on either the outer peripheral surface of the spring pin or the inner peripheral surface of the tube, so that the spring pin can be smoothly slid along the inner peripheral surface of the tube. In addition, since there is no step, it is possible to suppress or prevent the spring pin from falling due to the bias force acting on the spring pin, and it is possible to reliably prevent the spring pin from tilting and falling into a stuck state.

(A) is an external appearance perspective view which shows the spring pin type contact to which this invention is applied, (b) is a perspective view which divides a tube in half and shows the inside. (A) is a longitudinal cross-sectional view of the spring pin type contact of FIG. 1, (b) is the top view. (A) is a perspective view which shows the example of the multi-core electrical connector provided with the several spring pin type contact to which this invention is applied, (b) is a partial front view which shows the attachment state of a spring pin type contact. (C) is explanatory drawing which shows the contact state with respect to the other party's contact. It is a longitudinal cross-sectional view which shows the conventional spring pin type contact.

  Embodiments of a spring pin type contact and a multi-core electrical connector to which the present invention is applied will be described below with reference to the drawings.

  First, a spring pin type contact according to an embodiment of the present invention will be described with reference to FIG. 1 and FIG. The spring pin type contact 1 includes a tube 2 made of a conductive metal material, a spring pin 3 made of a conductive metal material that can slide in the tube 2 in the direction of the central axis 2 a, and an inside of the tube 2. And a coil spring 4 mounted coaxially. The spring pin 3 is always urged by the coil spring 4 in a direction in which the spring pin 3 is pushed forward from the tip opening 21 of the tube 2 to the front of the contact.

  The spring pin 3 includes a cylindrical pin rear end portion 31 and a cylindrical pin main body portion 33 protruding from the circular front end surface 32 of the pin rear end portion 31. Is a hemispherical tip surface 34. The outer diameter of the pin main body 33 is smaller than the outer diameter of the pin rear end portion 31. Further, the pin main body portion 33 is arranged so that the circular outer peripheral surface 36 of the pin main body portion 33 is inscribed in a circular outer peripheral surface 35 of the pin rear end portion 31 (indicated by a one-dot chain line in FIG. 2B). It protrudes from the front end surface 32 in an eccentric state with respect to the rear end portion 31. That is, the central axis 33 a of the pin main body 33 is eccentric with respect to the central axis 31 a of the pin rear end 31 by an eccentric amount Δ.

  The tube 2 includes a cylindrical body portion 22 in which a pin rear end portion 31 of the spring pin 3 is accommodated so as to be slidable in the direction of the central axis 2a. A front end opening 21 is formed at the front end of the cylindrical body 22, and the rear end is sealed off by a disk-shaped flange 23 having a larger diameter. The front end opening 21 is an opening having a diameter smaller than that of the pin rear end 31 of the spring pin 3 and slidable by the pin main body 33, through which the pin main body 33 is inserted and protrudes forward. Further, the tip opening 21 is in contact with the circular inner peripheral surface 24 of the cylindrical body 22 (shown by a broken line in FIG. 2B). The cylinder body 22 is eccentric. That is, the center 21 a of the tip opening 21 is eccentric with respect to the center 22 a of the cylindrical body 22 by an eccentric amount Δ.

  The coil spring 4 is mounted in a compressed state between the rear end surface 37 of the pin rear end portion 31 of the spring pin 3 and the bottom surface 26 of the cylindrical body portion 22 inside the cylindrical body portion 22 of the tube 2. ing. The rear end surface 37 of the pin rear end portion 31 with which the front end 41 of the coil spring 4 is in contact is closer to the pin main body portion 33 on the side in the eccentric direction of the pin main body portion 33 than the orthogonal surface orthogonal to the central axis 31a. It is an inclined surface that is inclined in the direction of. Therefore, the coil spring 4 applies a biasing force F in the direction opposite to the eccentric direction of the pin main body 33 to the spring pin 3 along with the biasing force in the axial direction.

  Here, the tip opening 21 of the tube 2 is formed by crimping the tip opening edge portion of the cylindrical body 22, and by adjusting the amount of crimping in each part in the circumferential direction, The tip opening 21 is formed at a position eccentric with respect to the cylindrical body 22. That is, in order to form the tip opening 21 in an eccentric position, the amount of caulking of the tip opening edge portion of the cylindrical body 22 is determined as shown in FIG. 21 is less on the side of the eccentric direction and more on the side opposite to the eccentric direction. The amount of caulking is zero at the inner contact 27 between the circular inner peripheral surface 24 of the cylindrical body 22 and the circular inner peripheral surface 25 of the tip opening 21, and is maximum at a point 28 on the opposite side in the diameter direction.

  In the spring pin type contact 1 configured as described above, the pin main body portion 33 of the spring pin 3 protruding from the distal end opening 21 of the tube 2 is eccentric to one side with respect to the central axis 2 a of the tube 2. Yes. The bias direction of the spring pin 3 by the coil spring 4 is the direction opposite to the eccentric direction. Therefore, by visually observing the pin main body 33 of the spring pin 3, the bias direction of the spring pin 3 can be easily confirmed. Therefore, as will be described later (see FIG. 3), when manufacturing a multi-core electrical connector having a structure in which a large number of spring pin contacts are arranged in the connector housing, the bias direction of each spring pin contact is the same direction. Can be aligned.

  The pin rear end portion 31 of the spring pin 3 is accommodated coaxially in the cylindrical body portion 22 of the tube 2 and can be smoothly slid in the direction of the axis 2a. The pin body portion 33 protruding from the pin rear end portion 31 is eccentric with respect to the pin rear end portion 31, and as can be seen from FIG. The part (inner contact point position) of the circular outer peripheral surface 36 on the eccentric side is linearly connected to the part of the circular outer peripheral surface 35 of the pin rear end portion 31. Similarly, the distal end opening 21 of the cylindrical body 22 of the tube 2 is also eccentric by the same amount with respect to the cylindrical body 22, and in the eccentric side portion (inner contact 27) of the distal end opening 21, A portion of the circular inner peripheral surface 24 of the cylindrical body portion 22 of the tube 2 is linearly connected to a portion of the circular inner peripheral surface 25 of the tip opening 21.

  Therefore, as shown in FIGS. 1 and 2, in the state where the spring pin 3 is most protruded (initial state before being brought into contact with the mating contact), the circular outer peripheral surface 35 of the pin rear end portion 31 of the spring pin 3 is the tube. 2, the spring pin 3 protrudes in a state without falling down.

  When the spring pin 3 is pressed against a mating contact (not shown), the spring pin 3 is pushed into the tube 2. On the eccentric side of the pin main body 33, there is no step on any of the circular outer peripheral surfaces 35, 36 of the spring pin 3 and the circular inner peripheral surfaces 24, 25 of the tube 2, so the circular inner peripheral surface 24 of the tube 2. , 25 can smoothly slide the spring pin 3. Therefore, the contact pressure when the spring pin 3 is pressed against the mating contact to form a contact state can be kept constant.

  Further, since there is no step, it is possible to suppress or prevent the spring pin 3 from falling due to the bias force F acting on the spring pin 3. That is, as shown in FIG. 2A, when the spring pin 3 is pushed in, a bias force F is applied, so that a moment indicated by an arrow M acts on the spring pin 3 so that the spring pin 3 may fall down. To do. However, on the collapsed side, the circular outer peripheral surfaces 35 and 36 of the spring pin 3 are in close contact with the flat circular inner peripheral surfaces 24 and 25 on the tube 2 side. Retained. Therefore, the spring pin 3 is pushed in without falling down. Further, even when the pushing force is released and the spring pin 3 slides in the protruding direction by the urging force of the coil spring 4, the sliding of the spring pin 3 is smoothly guided, and the spring pin 3 is surely brought into a stacked state. Is prevented.

(Multi-core electrical connector)
3A to 3C are a perspective view, a partial front view, and an explanatory view showing an example of a contact state, respectively, showing a multi-core electrical connector provided with a plurality of spring pin type contacts 1 having the above-described configuration.

  The multi-core electrical connector 50 includes a connector housing 51 made of plastic or the like, and a plurality of spring pin type contacts 1 (1), 1 (2), 1 (3), etc. attached to the connector housing 51. ing. These spring pin type contacts 1 have the same configuration as the spring pin type contact 1 described above. A plurality of mounting holes 53 (1), 53 (2), 53 (3),... That are arranged in a line at regular intervals are exposed on the front surface 52 of the connector housing 5. Spring pin type contacts 1 (1), 1 (2),... Are fixed to the mounting holes 53, and each spring pin type contact 1 (1), 1 (2),. The spring pin 3 protrudes forward. The flange 23 at the rear end of the tube of each spring pin type contact 1 (1), 1 (2)... Is soldered to a wiring portion on a circuit board (not shown), for example.

  Here, each of the spring pin type contacts 1 (1), 1 (2)... Is attached to the connector housing 51 in a state where the eccentric directions of the pin main body portions 33 are aligned in the same direction. In this example, as can be seen from FIG. 3B, the pin main body 33 is attached in an eccentric state on the upper side, and the respective bias directions are aligned. Therefore, as shown in FIG. 3C, when the spring pin type contacts 1 (1), 1 (2)... Are pushed into the contact plate 54 to form a contact state, each spring pin type contact 1 ( 1), 1 (2)... Can be in contact with the corresponding contact plate 54 under the same contact pressure. When the bias direction of each spring pin 3 is different, the load at the time of pushing is large and fluctuates greatly in the process of pushing in, but in this example there is little variation in load from the beginning of pushing to the end of pushing with a small load. .

1, 1 (1), 1 (2), 1 (3) Spring pin type contact 2 Tube 2a Center axis 3 Spring pin 4 Coil spring 21 Tip opening 21a Center 22 Cylindrical body 22a Center 23 Flange 24 Circular inner circumference Surface 25 Circular inner peripheral surface 27 Internal contact point 28 Point 31 Pin rear end portion 31a Central axis 32 Front end surface 33 Pin main body portion 33a Central axis 34 Front end surface 35 Circular outer peripheral surface 36 Circular outer peripheral surface 41 Front end 50 Multi-core electrical connector 51 Connector housing 52 Front 53 (1), 53 (2), 53 (3) Mounting hole 54 Contact plate Δ Eccentricity

Claims (5)

A conductive tube;
A conductive spring pin slidable in the direction of its central axis within the tube;
A coil spring that biases the spring pin in the direction of pushing out the spring pin from the tip opening of the tube;
The spring pin includes a cylindrical pin rear end portion and a columnar pin main body portion protruding from a front end surface of the pin rear end portion, and is more external to the pin main body portion than the pin rear end portion. The diameter of the pin body portion is eccentric with respect to the pin rear end portion so that the circular outer peripheral surface of the pin main body portion is inscribed in the circular outer peripheral surface of the pin rear end portion,
The tube includes a cylindrical body portion in which the rear end portion of the pin is housed in a slidable state, and the main body portion of the pin slides with a smaller diameter than the rear end portion of the pin at the front end of the cylindrical body portion. The tip opening is formed so as to be inserted through the cylindrical body so that the circular inner peripheral surface of the tip opening is inscribed in the circular inner peripheral surface of the cylindrical body. In contrast, the tip opening is eccentric,
A spring pin type contact, wherein a biasing force in a direction opposite to an eccentric direction of the pin main body portion with respect to the rear end portion of the pin is applied to the spring pin by the coil spring. In claim 1,
A rear end surface of the pin rear end portion of the spring pin is inclined in a direction in which an eccentric direction side of the pin main body portion approaches the pin main body portion with respect to an orthogonal surface orthogonal to the central axis of the pin rear end portion. Is an inclined surface,
The coil spring is arranged coaxially with respect to the rear end portion of the pin, and one end of the coil spring is in contact with the inclined surface. In claim 1 or 2,
The tip opening is formed by crimping the tip opening edge portion of the cylindrical body of the tube,
The amount of caulking at the tip opening edge portion of the cylindrical body is zero at the tip opening edge portion on the side of the tip opening edge with respect to the cylindrical body, and is opposite to the eccentric direction. A spring pin type contact having a maximum at a portion of the edge opening edge portion located on the side. A connector housing;
A plurality of spring pin type contacts attached to the connector housing;
The spring pin type contact is the spring pin type contact according to any one of claims 1 to 3,
Each of the spring pin type contacts is attached to the connector housing in a state in which the eccentric directions of the pin main body portions of the spring pin type contacts are aligned in the same direction. . In claim 4,
The multi-pin electrical connector, wherein the spring pin type contacts are arranged in a straight line at a predetermined interval in a state parallel to each other.

Images