JP2013178284A - Electric contact and inspection jig including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric contact in which a trouble of contact failure is hard to generate and production cost can be suppressed, and an inspection jig including the electric contact.SOLUTION: An electric contact 2 is used for an inspection jig 1 for inspecting a circuit board and provided in a housing hole 3 of the inspection jig 1. The electric contact 2 is constituted of a wire material 13 and includes an inspection side end part 10, a jig side end part 5 and a body part 12 housed in the housing hole 3, at least one of the inspection side end part 10 and the jig side end part 5 is wound like a spring shape whose winding diameter is reduced to a tip direction, a pitch angle of winding times of tip parts 14 and 15 is set to 0 degree, and the body part 12 has a spring part 22 and a stick winding part 21. A part of the spring part 22 has a large diameter part 16 of a winding diameter larger than a winding diameter of the other part of the spring part 22 so as to be pressed into the housing part 3, and a portion other than the large diameter part of the body part 12 is a small diameter part of a diameter slightly thinner than an inner diameter of the housing part 3.

Description

  The present invention relates to an electrical contact for inspecting electrical characteristics of a circuit board, an electronic component, and the like, and an inspection jig including the electrical contact.

  In general, an inspection jig having a plurality of electrical contacts that come into contact with an object to be inspected is used for electrical inspection to detect an abnormality such as a short circuit or disconnection of a circuit board wiring pattern or an integrated circuit such as an IC. ing. As an electrical contact, for example, as disclosed in Patent Document 1 or 2, a structure in which a pin-shaped plunger is supported by a coil spring is often used. In the electric contact configured as described above, the plunger can elastically advance and retract with respect to the inspection object by the elastic deformation of the coil spring. Therefore, the plunger can be brought into contact with the inspection object with an appropriate pressing force.

JP 2008-275421 A JP 2008-546164 A

  However, in the electrical contacts described in Patent Documents 1 and 2, the electrical contact is composed of a plurality of parts such as a plunger and a coil spring. For this reason, there is a problem that a problem of poor contact between the components is likely to occur, and the number of components and the number of assembly steps are large, resulting in increased production costs.

  Therefore, an object of the present invention is to provide an electrical contact that is less likely to cause trouble of contact failure and that can reduce the production cost, and an inspection jig including the electrical contact.

  In order to solve the above-described problems, the present invention is an electric contactor used in an inspection jig for inspecting electrical characteristics of an inspection object, and is disposed inside an accommodation hole of the inspection jig, and includes an electric contact The child is composed of a wire, and is arranged on one end side in the length direction of the electric contact and is in contact with the inspection object. A jig-side end that contacts the contact, an inspection-side end and the jig-side end, and a main body that is accommodated in the accommodation hole; at least the inspection-side end or the jig-side end On the other hand, the wire is wound in a spring shape so that the winding diameter decreases toward the tip, and the winding pitch angle of the tip is configured at 0 degrees, and the main body has a wire on the jig side end. The wire rods are in close contact with each other between the spring portion spirally wound to have spring properties and the spring portion and the inspection side end portion. A large-diameter portion having a winding diameter larger than the winding diameter of other portions of the spring portion is provided so that a part of the spring portion of the main body portion is press-fitted into the housing portion. The main body portion other than the large-diameter portion is a small-diameter portion having a diameter slightly smaller than the inner diameter of the housing portion.

  In the electrical contact according to the present invention, at least one tip portion of the inspection-side end portion or the jig-side end portion may be bent from the arc portion around which the wire is wound to the winding shaft side and pass through the winding shaft.

  In the electrical contact according to the present invention, the length of the tightly wound portion is 4 times and the length of the spring portion is 6 times the amount of displacement in the winding axis direction at the time of inspection of the tip portion of the inspection side end portion. It may be there.

  In the electrical contact according to the present invention, the electrical contact may be coated with gold plating.

  In order to solve the above-described problems, the present invention provides a housing having a housing portion for housing an electrical contact in an inspection jig for inspecting an electrical property of the inspection object by bringing the electrical contact into contact with the inspection object. A body is provided, and the electrical contact is the above-described electrical contact.

  In order to solve the above-described problems, the present invention provides a housing having a housing portion for housing an electrical contact in an inspection jig for inspecting an electrical property of the inspection object by bringing the electrical contact into contact with the inspection object. The electrical contact is the above-described electrical contact, and the accommodating portion is a small diameter portion that is a portion other than the large diameter accommodating portion in which the large diameter portion of the electrical contact is accommodated and the large diameter portion of the spring portion. And a step portion with which the large diameter portion abuts is formed at the boundary between the large diameter storage portion and the small diameter storage portion.

  In order to solve the above-described problems, the present invention is an electric contactor used in an inspection jig for inspecting electrical characteristics of an inspection object, and is disposed inside an accommodation hole of the inspection jig, and includes an electric contact The child is composed of a wire, and is arranged on one end side in the length direction of the electric contact and is in contact with the inspection object. The inspection jig is arranged on the other end side with respect to the one end side. A jig side end that contacts the contact point of the wire, an inspection side end and the jig side end, and a main body portion that is accommodated in the accommodation hole. The spring portion is wound so as to have

  In the electric contact according to the present invention, at least one of the inspection side end and the jig side end may be formed in a spring shape by winding a wire.

  In the electrical contact according to the present invention, at least one of the inspection side end and the jig side end may be wound with a wire so that the winding diameter decreases toward the tip.

  In the electrical contact according to the present invention, a columnar portion extending along the winding axis of the wound wire is formed at at least one tip of the inspection side end or the jig side end. Also good.

  In the electrical contact according to the present invention, a spherical portion may be provided at at least one tip of the inspection side end or the jig side end.

  Further, in the electrical contact according to the present invention, at least one of the inspection side end or the jig side end may be formed by a folded portion that is folded back from the end side of the electrical contact to the main body side. Good.

  In the electrical contact according to the present invention, the main body portion may have a tightly wound portion wound between the spring portion and the inspection-side end portion so that the wires are in close contact with each other.

  Further, in the electric contact according to the present invention, a large diameter portion having a winding diameter larger than the winding diameter of the other portion of the spring portion is provided so that a part of the spring portion of the main body portion is press-fitted into the housing portion. It is good also as having.

  In the electric contact according to the present invention, the electric contact may be coated with gold plating.

  In order to solve the above-described problems, the present invention provides a housing having a housing portion for housing an electrical contact in an inspection jig for inspecting an electrical property of the inspection object by bringing the electrical contact into contact with the inspection object. A body is provided, and the above-described electrical contact is provided as an electrical contact.

  In order to solve the above-described problems, the present invention provides a housing having a housing portion for housing an electrical contact in an inspection jig for inspecting an electrical property of the inspection object by bringing the electrical contact into contact with the inspection object. The electrical contact is the above-described electrical contact, and the accommodating portion is a small diameter portion that is a portion other than the large diameter accommodating portion in which the large diameter portion of the electrical contact is accommodated and the large diameter portion of the spring portion. It is good also as the step part which a large diameter part contact | abuts is formed in the boundary part of a large diameter accommodating part and a small diameter accommodating part.

  As described above, according to the electrical contact and the inspection jig of the present invention, it is possible to prevent troubles due to poor contact and to reduce production costs.

It is a front view which shows the inspection jig which concerns on Embodiment 1 of this invention. It is a figure which shows an inspection jig from the EE direction of FIG. It is an expanded sectional view for demonstrating the internal structure of the inspection jig shown in FIG. It is a front view of the contact shown in FIG. It is a top view of the contact shown in FIG. It is a bottom view of the contact shown in FIG. It is an expanded sectional view showing a state before attaching an electrode holder to a container after arranging a contact in a container hole of a container. It is an expanded sectional view of an inspection jig, and is a figure showing the state before making a contact child contact a circuit board. It is an expanded sectional view of an inspection jig, and is a figure showing the state after making a contact child contact a circuit board. It is a figure which shows the state which the front-end | tip part of the test | inspection side edge part contacted diagonally with respect to the circuit electrode. It is a front view which shows the structure of the contactor concerning Embodiment 2 of this invention. It is a bottom view which shows the structure of the contactor shown in FIG. It is a front view which shows the structure of the contactor which concerns on Embodiment 3 of this invention. It is a figure which shows the state which the spherical part of the contactor shown in FIG. 13 contact | abutted to the resist. It is a figure which shows the state which the spherical part of the contactor shown in FIG. 14 entered in the recessed part, and contacted the circuit electrode. It is a figure explaining the method of forming the spherical part of the contact shown in FIG. It is a front view which shows the structure of the contactor which concerns on Embodiment 4 of this invention. It is a figure which shows the state which the folding | returning part of the contactor shown in FIG. 17 contact | abutted to the resist. It is a figure which shows the state which the folding | turning part of the contactor shown in FIG. 17 entered the recessed part, and contacted the circuit electrode. It is a figure explaining attaching the contact shown in FIG. 17 from the small diameter hole side.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.

(Configuration of inspection jig)
First, the overall configuration of the inspection jig 1 will be described with reference to FIGS. 1 to 3. FIG. 1 is a front view showing an inspection jig 1 according to an embodiment of the present invention. FIG. 2 is a view showing the inspection jig 1 viewed from the EE direction of FIG. FIG. 3 is an enlarged cross-sectional view for explaining the internal structure of the inspection jig 1 shown in FIGS. 1 and 2. In FIG. 2, only some of the electrical contacts 2 and the accommodation holes 3 are denoted by reference numerals. In the following description, the arrow X1 direction is the left direction, the X2 direction is the right direction, the Y1 direction is the upper direction, the Y2 direction is the lower direction, the Z1 direction is the front, and the Z2 direction is the rear.

  The inspection jig 1 of the present embodiment inspects the electrical characteristics of a circuit board P (see FIGS. 8 and 9, etc.) that is an inspection object such as a circuit board or IC, and the circuit board P is short-circuited or disconnected. It is used for electrical inspection to detect abnormalities.

  As shown in FIGS. 1 to 3, the inspection jig 1 includes a plurality of electric contacts 2 (hereinafter referred to as “contact 2”) and a plurality of contacts 2 arranged one by one. A housing 4 in which the housing hole 3 is formed, a plurality of electrodes 6 that respectively contact the jig-side end 5 of the contact 2 housed in the housing hole 3, and an electrode holder that holds the plurality of electrodes 6 7 and a wiring portion 8 for electrically connecting a main body portion of an inspection apparatus (not shown) provided with the inspection jig 1 and the inspection jig 1. The wiring portion 8 is constituted by a plurality of conducting wires 9 (see FIG. 3) provided for each electrode 6.

  The contact 2 includes a jig-side end 5 that contacts the electrode 6, a test-side end 10 that contacts the circuit electrode P1 (see FIGS. 8 and 9, etc.) as a terminal to be inspected of the circuit board P, and a jig. The side end portion 5 and the inspection side end portion 10 are connected to each other, and a main body portion 12 having a portion accommodated in the accommodation hole 3 is provided.

  In the contact 2, the jig side end 5 to the inspection side end 10 are integrally formed by a conductive wire 13. The wire 13 is made of, for example, a material whose spiral portion can have a spring property when wound in a spiral shape. For example, a nickel alloy, a piano wire, a tungsten alloy, or the like can be used as the wire 13. The wire 13 forming the contact 2 has, for example, a diameter of about 0.05 mm, and extends from the tip 14 of the jig-side end 5 that contacts the electrode 6 to the tip 15 of the inspection-side end 10. Has a length of about 4.8 mm.

  The container 4 is formed in a block shape from an insulating material. The housing 4 is formed with a plurality of housing holes 3 as described above. Specifically, the housing 4 is formed with a plurality of housing holes 3 penetrating in the vertical direction as shown in FIGS. In FIG. 2, for convenience of explanation, the accommodation body 4 in which the accommodation holes 3 are uniformly formed at a predetermined pitch in the front-rear direction and the left-right direction is illustrated. The arrangement corresponds to the arrangement of the circuit electrode P1.

  The accommodation hole 3 is formed in a substantially cylindrical shape. Specifically, the accommodation hole 3 includes a large-diameter hole 16 as a large-diameter accommodation portion formed on the upper end side, and a small diameter that continues downward from the large-diameter hole 16 and is slightly smaller in diameter than the large-diameter hole 16. It is comprised from the small diameter hole 17 as an accommodating part. A step portion 25 is formed at a boundary portion between the large diameter hole 16 and the small diameter hole 17.

  Similarly to the container 4, the electrode holder 7 is formed in a block shape from an insulating material. The electrode holder 7 is fixed to the container 4 by fixing means such as screws.

  In the present embodiment, the tip portions 9 </ b> A of the plurality of conductive wires 9 constituting the wiring portion 8 are the electrodes 6. Specifically, as shown in FIG. 3, the tip end portion 9 </ b> A of the conducting wire 9 is bonded and fixed to the electrode holder 7, and the portion bonded and fixed to the electrode holder 7 is the electrode 6. The electrode 6 is held by the electrode holder 7 so that the center position in the radial direction of the accommodation hole 3 and the center position in the radial direction of the electrode 6 substantially coincide. One electrode 6 is in contact with and corresponding to the jig-side end 5 of one contactor 2.

  The conducting wire 9 is, for example, an enameled wire in which an insulating film (not shown) serving as an insulating layer is formed around a copper wire. A predetermined plating layer is formed on the leading end of the conductive wire 9 (the lower end surface of the electrode 6 in FIG. 3, that is, the contact surface with the jig side end portion 5 of the contact 2).

(Configuration of electrical contact)
Next, a detailed configuration of the contact 2 will be described with reference to FIGS. 4, 5, 6 and the like. FIG. 4 is a front view of the contact 2 shown in FIG. 3 as viewed from the front. FIG. 5 is a plan view of the contact 2 shown in FIG. 4 as viewed from above. FIG. 6 is a bottom view of the contact 2 shown in FIG. 4 as viewed from below. FIG. 7 is an enlarged cross-sectional view showing a state before the electrode holder 7 is attached to the container 4 after the contact 2 is disposed in the container hole 3 of the container 4.

  As shown in FIG. 4 and the like, the contact 2 has a jig side end portion 5, a main body portion 12, an inspection side end portion 10 and the like. The contact 2 has a jig-side end 5 disposed on one side (upper in FIG. 4) with the main body 12 sandwiched therebetween, and an inspection-side end on the other side (lower in FIG. 4) of the main body 12. 10 is arranged. In addition, the contact 2 is formed by spirally winding a single wire 13 around the winding axis L, and the jig-side end portion 5, the main body portion 12, and the inspection-side end portion 10 are formed by a single wire rod 13. It is constructed integrally. For example, since a conducting wire such as a nickel alloy is used as the wire 13, the contact 2 is electrically secured from the inspection side end 10 to the jig side end 5.

  The jig side end portion 5 is wound so that the winding diameter decreases from the main body portion 12 side toward the distal end portion 14 (upward), and is configured as a winding diameter reducing portion 18. In the present embodiment, the winding diameter reducing portion 18 has a configuration in which the wire 13 is wound over about one and a half turns. The wire rod 13 forming the tip portion 14 has a winding pitch angle of approximately 0 degrees so that the tip portion 14 becomes flat. As shown in FIG. 5, the tip end portion 19 of the wire rod 13 wound around the tip portion 14 is formed so as to be bent from the arc portion around which the wire rod 13 is wound toward the winding axis L and pass through the winding axis L. . Further, the wire diameter reducing portion 18 is wound with the wire 13 spaced apart. Therefore, the winding diameter reduction part 18 has the property of a compression spring, and has elasticity in a direction (vertical direction) along the axial direction of the winding axis L so as to be deformable.

  The main body 12 includes a tightly wound portion 21 and a spring wound portion 22 as a spring portion. In the tightly wound part 21, the wire 13 is wound in close contact. In the spring winding part 22, the wire 13 is wound at an interval. Therefore, the spring winding portion 22 has the properties of a compression spring and can be deformed while having elasticity in the vertical direction along the winding axis L. On the other hand, the tightly wound portion 21 does not easily change in the shrinking direction because the wires 13 are in close contact with each other, and also has a configuration that is highly rigid and difficult to deform in the direction orthogonal to the winding axis L. The main body 12 has the same winding diameter of the tightly wound portion 21 and the spring wound portion 22 except for the large diameter portion 23 provided at the upper end portion of the spring wound portion 22. The large-diameter portion 23 is formed for about one turn, and has a larger winding diameter than the other portions of the main body portion 12.

  The inspection-side end portion 10 is wound as the winding diameter decreases from the main body portion 12 toward the distal end portion 15 (downward), and is configured as a winding diameter reduction portion 24. In the present embodiment, the winding diameter reducing portion 24 has a configuration in which the wire 13 is wound over approximately four and a half turns. The wire rod 13 forming the tip portion 15 has a winding pitch angle of approximately 0 degrees so that the tip portion 15 becomes flat. As shown in FIG. 6, the tip portion 26 of the wire 13 wound around the tip portion 15 is formed to be bent from the arc portion around which the wire 13 is wound toward the winding axis L and pass through the winding shaft L. . Furthermore, the wire diameter reduction part 24 is wound with the wire 13 spaced apart. Therefore, the winding diameter reduction part 24 has the property of a compression spring, has elasticity in the vertical direction, and is configured to be deformable.

  As described above, in the contact 2, for example, the diameter of the wire 13 is 0.05 mm, and the length N1 from the distal end portion 14 of the jig side end portion 5 to the distal end portion 15 of the inspection side end portion 10 is 4.8 mm. Configured to the extent. In this case, the dimension of each part of the contact 2 is set as shown in FIG. 4, for example. That is, the length N2 of the tight winding portion 21 is 1.8 mm, the length N3 of the spring winding portion 22 including the large diameter portion 23 is 2.4 mm, the length N4 of the winding diameter reduction portion 18 is 0.26 mm, and the winding The length N5 of the diameter reducing portion 24 is formed to be 0.34 mm. Further, the main body 12 is formed, for example, such that the diameter R1 of the large diameter portion 23 is 0.4 mm and the diameter R2 of portions other than the large diameter portion 23 is 0.34 mm. And the diameter R3 of the front-end | tip parts 14 and 15 of the winding diameter reduction parts 18 and 24 is formed in 0.21 mm, for example.

  The contact 2 configured as described above is arranged inside the accommodation hole 3 as shown in FIG. For the contact 2 in which the dimensions of the respective parts are set as described above, the dimensions of the respective parts of the accommodation hole 3 are set, for example, as shown in FIG. That is, the inner diameter M1 of the small-diameter hole 17 of the accommodation hole 3 is set to be slightly thicker than the diameter R2 of the main body 12 of the contact 2, for example, the small-diameter hole 17 with respect to the main body 12 having a diameter R2 = 0.34 mm. Is set to an inner diameter M1 = 0.35 mm. Further, the inner diameter M2 of the large diameter portion 23 formed in the upper portion of the accommodation hole 3 is set to be the same as the diameter R1 of the large diameter portion 23 of the contact 2, and for example, as described above, the diameter R1 = 0.4 mm. For the large diameter portion 23, the large diameter hole 16 is set to have an inner diameter M2 = 0.4 mm. Further, the thickness H of the container 4 is set to 4 mm. Therefore, the length of the accommodation hole 3 is also set to 4 mm. The vertical length T1 of the large-diameter hole 16 of the accommodation hole 3 is set to 0.16 mm, and the vertical length T2 of the small-diameter hole 17 is set to 3.84 mm.

  The contact 2 is inserted into the accommodation hole 3 from the large-diameter hole 16 side with the inspection-side end 10 facing the insertion direction. And as shown in FIG. 7, it inserts until the large diameter part 23 contact | abuts to the step part 25. FIG. The inspection-side end portion 10 and the main body portion 12 are set to have a slightly smaller diameter than the small-diameter hole 17. Therefore, the inspection end portion 10 and the main body portion 12 can be smoothly inserted into the small diameter hole 17. And the large diameter part 23 contact | abuts to the step part 25, and the contactor 2 is positioned in the up-down direction. The diameter R1 of the large diameter portion 23 and the inner diameter M2 of the large diameter hole 16 are the same. Therefore, when the large diameter portion 23 is inserted into the large diameter hole 16, a force that pushes the large diameter portion 23 into the large diameter hole 16 is slightly applied to press the large diameter portion 23 into the large diameter hole 16. Become.

  In a state where the large-diameter portion 23 is in contact with the step portion 25, a part of the tightly wound portion 21 and the inspection-side end portion 10 protrude downward from the lower surface of the container 4, and one of the jig-side end portions 5 The portion protrudes upward from the upper surface of the container 4. Specifically, since the contact 2 and the accommodation hole 3 are set as described above, the protruding length t1 at which the contact 2 protrudes from the lower surface of the accommodation body 4 is 0.7 mm. Further, the protruding length t2 at which the jig-side end portion 5 protrudes from the upper surface of the container 4 is 0.1 mm.

  After the contact 2 is inserted into each accommodation hole 3 as shown in FIG. 7, the electrode holder 7 to which the electrode 6 is directed is attached to the accommodation body 4. The tip end portion 14 of the jig-side end portion 5 of the contact 2 protrudes from the upper surface of the container 4. Therefore, when the electrode holder 7 is attached to the upper surface of the container 4, the jig-side end 5 of the contact 2 comes into contact with the electrode 6 while being urged. The jig side end portion 5 is biased with respect to the electrode 6, so that electrical contact with the electrode 6 can be ensured.

(Operation when using the inspection jig 1)
Next, the operation of the inspection jig 1 when inspecting the circuit board P, which is an inspection object, using the inspection jig 1 will be described with reference to FIGS. FIG. 8 is an enlarged cross-sectional view of the inspection jig 1 and shows a state before the contact 2 is brought into contact with the circuit board P. FIG. FIG. 9 is also an enlarged cross-sectional view of the inspection jig 1. FIG. 9 shows a state after the contact 2 is brought into contact with the circuit board P.

  First, as shown in FIG. 8, the inspection jig 1 is arranged so that each inspection-side end portion 10 of the inspection jig 1 and a predetermined circuit electrode P <b> 1 to be inspected of the circuit board P face each other in the vertical direction. The relative position with the circuit board P is adjusted. 8 and 9, one inspection-side end 10 and a predetermined circuit electrode P1 of the circuit board P are shown for convenience of explanation. The inspection jig 1 is moved to the circuit board P side in a state where each inspection-side end portion 10 and the predetermined circuit electrode P1 face each other in the vertical direction. Then, as shown in FIG. 9, each inspection-side end portion 10 abuts on a predetermined circuit electrode P <b> 1, and the spring winding portion 22 of the contact 2 contracts according to the amount of movement of the inspection jig 1, and the inspection-side end The part 10 comes into contact with the circuit electrode P1 while being biased. At this time, the length in the vertical direction of the tightly wound portion 21 hardly changes. When each inspection-side end 10 comes into contact with a predetermined circuit electrode P1, the circuit electrode P1 and the electrode 6 of the circuit board P are brought into conduction through the contact 2 and the circuit board P can be inspected. .

(Main effects of this embodiment)
As described above, configuring the inspection jig 1 and the contact 2 has the effects described below.

  First, in the form according to the present embodiment, the contact 2 is constituted by a single wire 13. That is, the contact 2 is composed of one member. Therefore, the configuration is extremely simple, and since it is a single member, there is no problem of poor contact between components. The contact 2 is a member having a total length of several millimeters. Therefore, if the contact 2 is composed of a plurality of members, extremely fine work is required for assembly. However, as in the present embodiment, the contactor 2 is composed of one member, so that the assembly work of the contactor 2 becomes unnecessary, and the number of assembly steps can be reduced. Furthermore, the number of parts can be reduced, and the part cost can be reduced. In addition, the contact 2 is substantially entirely configured by winding a wire 13 in a spiral shape. Therefore, it can be set as the structure which has rigidity and elasticity compared with the case where the wire 13 is comprised in linear form. For example, as described above, the wire 13 has a diameter of about 0.05 mm, and is easily plastically deformed when the entire contactor 2 is formed in a linear shape. On the other hand, when the wire 13 is wound spirally, the contactor 2 can be configured to be elastically deformable while having rigidity.

  Further, the contact 2 is arranged on one end side in the length direction of the contact 2 and is in contact with the circuit board P, and the inspection side end 10 is arranged on the other end side with respect to the inspection side end 10. A jig-side end portion 5 that comes into contact with the electrode 6 of the tool 1, an inspection-side end portion 10 and the jig-side end portion 5, and a body portion 12 having a portion that is accommodated in the accommodation hole 3. Yes. And this main-body part 12 has the spring winding part 22 as a spring part wound so that the wire 13 might have the property of a compression spring helically.

  The contact 2 configured in this manner can be expanded and contracted with the spring winding portion 22 having elasticity. When the inspection-side end 10 is brought into contact with the circuit electrode P1 of the circuit board P, the inspection-side end The portion 10 can be brought into contact with the circuit electrode P1 while being urged. For this reason, electrical contact between the inspection-side end 10 and the circuit electrode P1 can be ensured.

  Moreover, since the test | inspection side edge part 10 is wound so that the wire 13 may have a compression spring property, the contact 2 has elasticity in the direction along the winding axis L. For this reason, the test | inspection side edge part 10 can bend in the left-right front-back direction with respect to the winding axis L, as shown in FIG. As a result, the tip 15 can be brought into contact with the circuit electrode P1 at an angle.

  A resist P2 is deposited around the circuit electrode P1, and the circuit electrode P1 is disposed inside the recess P3 of the resist P2. For this reason, for example, when the contact S having a pin-like shape is used, if the tip of the contact S is slightly detached from the circuit electrode P1 and comes into contact with the surface of the resist P2, the contact S is no longer used. It cannot be brought into contact with the circuit electrode P1.

  On the other hand, since the inspection-side end portion 10 is wound in a spring shape, it can be bent with respect to the winding axis L in the left-right and front-rear directions. Further, the tip 15 of the inspection side end 10 is flat. For this reason, even if the tip 15 of the inspection-side end 10 comes into contact with the edge P4 on the recess P3 side of the resist P2, the inspection-side end 10 bends to cause a circuit from the edge P4. The tip portion 15 protruding to the electrode P1 side is inclined in a direction in contact with the circuit electrode P1, and the tip portion 15 can be brought into contact with the circuit electrode P1. That is, in the inspection, it is ideal to align the relative position of the inspection jig 1 and the circuit board P so that the winding axis L is positioned at the center of the circuit electrode P1 (recess P3). Even in a state where the alignment is displaced and the tip portion 15 hits the edge portion P4, the tip portion 15 of the contactor 2 and the circuit electrode P1 can be reliably contacted.

  Further, the jig-side end portion 5 also has elasticity in the direction along the winding axis L because the wire 13 is wound in a spring shape. For this reason, the jig side end portion 5 can also bend in the left-right front-rear direction with respect to the winding axis L. As a result, there is a step portion between the electrode 6 and the electrode holder 7, and even when the tip portion 14 is in contact with the step portion, the tip portion 14 of the contact 2 and the electrode 6 Contact can be made reliably.

  As described above, the contact 2 can be expanded and contracted with the spring winding portion 22 having elasticity. Therefore, when the inspection jig 1 is moved to the circuit board P side with the inspection-side end portion 10 in contact with the circuit electrode P1 of the circuit board P, the spring winding portion 22 is contracted and the inspection-side end portion 10 is moved upward. It moves into the small diameter hole 17 as shown in FIG. In the present embodiment, in the contact 2, the wire 13 is wound around the inspection-side end portion 10 so that the winding diameter decreases toward the tip. Therefore, it is prevented that the inspection side end portion 10 is caught by the opening edge portion 17A of the small diameter hole 17 and the upward movement of the inspection side end portion 10 is prevented. For example, as shown in FIG. 10 described above, the front end portion 15 of the inspection side end portion 10 abuts on the edge portion P4 on the concave portion P3 side of the resist P2, and the inspection side end portion 10 is bent in the left-right front-rear direction. In some cases, it may move upward. Even in such a case, the inspection-side end 10 is opened at the edge of the small-diameter hole 17 by winding the wire 13 so that the winding diameter of the inspection-side end 10 decreases toward the tip. It can prevent being caught by 17A.

  When the electrode holder 7 is attached to the container 4, the jig side end portion 5, part of which protrudes from the upper surface of the container 4, is compressed and accommodated in the large-diameter hole 16. Accordingly, when the jig-side end 5 is caught by the opening edge 16A of the large-diameter hole 16, a part of the jig-side end 5 is sandwiched between the joining portion of the electrode holder 7 and the container 4. The connection between the jig side end 5 and the electrode 6 may be poor. However, in the contact 2, the wire 13 is wound around the jig-side end 5 so that the winding diameter decreases toward the tip. Therefore, it is possible to prevent the jig side end portion 5 from being caught by the opening edge portion 16 </ b> A of the large-diameter hole 16 when the electrode holder 7 is attached to the container 4.

  Further, a tightly wound portion 21 is formed on the main body portion 12 of the contact 2 between the spring wound portion 22 and the inspection side end portion 10. When the spring winding portion 22 expands and contracts and the contact 2 moves up and down in the small diameter hole 17, the tight winding portion 21 is guided to the inner peripheral surface of the small diameter 17. The tightly wound portion 21 does not easily change in the shrinking direction because the wires 13 are in close contact with each other, and has a configuration that is highly rigid and difficult to deform in the direction orthogonal to the winding axis L. Therefore, the tightly wound portion 21 is reliably guided with respect to the inner peripheral surface of the small-diameter hole 17, and the shaking of the inspection-side end portion 10 in the left-right front-rear direction can be suppressed. Therefore, for example, it is possible to prevent poor contact with the circuit electrode P <b> 1 due to the inspection-side end portion 10 swaying in the left-right front-rear direction.

  The contact 2 is guided more stably with respect to the small diameter 17 by increasing the length of the tightly wound portion 21, but if the closely wound portion 21 is lengthened, the contact portion 2 of the spring wound portion 22 is increased. The length is shortened. When the length of the spring winding portion 22 is shortened, when the spring winding portion 22 expands and contracts, the amount of expansion / contraction (displacement amount) per unit length of the spring winding portion 22 increases and the spring winding portion 22 deteriorates (sagging). ) Progresses faster. Therefore, it is necessary to appropriately set the lengths of the tightly wound portion 21 and the spring winding portion 22 from the stable surface of the guide by the small diameter hole 17 of the contact 2 and the deteriorated surface of the spring winding portion 22. For example, in the contact 2 in the inspection jig 1 according to the present embodiment, the length of the tightly wound portion 21 is approximately four times the vertical displacement of the tip portion 15 of the inspection-side end portion 10. Moreover, by making the length of the spring winding part 22 approximately six times, the contact 2 can be stably guided by the accommodation hole 3, and deterioration of the spring winding part 22 can be satisfactorily suppressed. Further, by providing the contact winding part 21 with such a length, the contact winding part 21 can be picked up with tweezers when the contact 2 is inserted into the accommodation hole 3 or the like. Can be handled easily.

  Further, the contact 2 is formed with a large-diameter portion 23 having a winding diameter set at the upper portion of the spring winding portion 22 of the main body portion 12 so as to be press-fit into the large-diameter hole 16 of the accommodation hole 3. ing. For this reason, even when the electrode holder 7 is detached from the container 4 and the surface of the container 4 to which the electrode holder 7 is attached is directed downward, the contact 2 from the container hole 3. Will not fall out.

  The inspection jig 1 may be disposed below the circuit board P so that the contact 2 can be brought into contact with the circuit electrode P1 disposed on the lower surface of the circuit board P. In this case, the inspection-side end portion 10 is positioned above, and the jig-side end portion 5 is positioned below. Therefore, by removing the electrode holder 7 from the container 4, it is possible to take out the contact 2 downward. However, since the large diameter portion 23 is press-fitted into the large diameter hole 16, the contact 2 is It is possible to prevent inadvertent dropping from the accommodation hole 3.

  The tip portion 19 of the jig-side end portion 5 of the contact 2 and the tip portion 26 of the inspection-side end portion 10 are formed so as to pass through the winding shaft L. Therefore, even if the contact 2 rotates about the winding axis L, the tip portion 19 and the tip portion 26 are arranged on the winding shaft L. That is, when the contact 2 is accommodated in the accommodation hole 3, no matter how the contact 2 is arranged around the winding axis L, the distal end portion 19 and the distal end portion 26 are located on the winding axis L. It is arranged to pass through. Therefore, contact between the contact 2 and the electrode 6 and the circuit electrode P can be ensured.

(Second Embodiment of Contact)
The contact can be configured as a contact 30 shown in FIGS. 11 and 12. FIG. 11 is an enlarged cross-sectional view of the inspection jig 1 and shows a front view of the contact 30. FIG. 12 is a bottom view of the contact 2 when the contact 30 shown in FIG. 11 is viewed from below. In FIG. 11 and FIG. 12, the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIGS. 11 and 12, the contact 30 is provided with a columnar portion 31 at the distal end portion 15 of the inspection-side end portion 10 of the contact 30. The columnar portion 31 can be formed by having the tip portion 32 of the wire 13 wound around the tip portion 15 face the winding axis L downward. By providing the columnar portion 31 at the distal end portion 15, the contact between the contact 30 and the circuit electrode P <b> 1 of the circuit board P can be made more reliable.

  Further, a columnar portion similar to the tip portion 15 may be provided at the tip portion 14 of the jig-side end portion 5 of the contact 30. By providing the columnar part at the tip part 14, the contact between the contact 30 and the electrode 6 can be made more reliable.

(Third embodiment of contact)
Moreover, a contactor can be comprised as the contactor 40 shown in FIG. FIG. 13 is an enlarged cross-sectional view of the inspection jig 1 and shows a front view of the contact 40. In FIG. 13, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 13, the contact 40 is provided with a spherical portion 41 at the tip 15 of the inspection side end 10 of the contact 40. By providing the spherical portion 41 at the distal end portion 15, the contact between the contact 40 and the circuit electrode P <b> 1 of the circuit board P can be made more reliable. The contact of the contact 40 to the circuit electrode P1 is performed by aligning the relative positions of the inspection jig 1 and the circuit board P so that the winding axis L of the contact 40 is positioned at the center of the circuit electrode P1 (recess P3). It is preferable to carry out in the state. However, if the relative positions of the inspection jig 1 and the circuit board P are not aligned, the spherical portion 41 may come into contact with the resist P2 as shown in FIG. Even in such a case, when the spherical portion 41 abuts on the edge portion P4 on the concave portion P3 side of the resist P2, the spherical portion 41 slides on the edge portion P4 as shown in FIG. It can enter P3 and contact the circuit electrode P1. Thus, by providing the spherical portion 41 at the distal end portion 15, the contact between the contact 40 and the circuit electrode P <b> 1 of the circuit board P can be made more reliable.

  Further, a spherical portion similar to the tip portion 15 may be provided at the tip portion 14 of the jig-side end portion 5 of the contact 40. By forming a spherical portion at the tip portion 14, when there is a step portion between the electrode 6 and the electrode holder 7, even if the spherical portion provided at the tip portion 14 abuts on this step portion, Contact between the contact 40 and the electrode 6 can be reliably performed.

  The spherical part 41 provided in the front-end | tip part 15 of the test | inspection side edge part 10 can be formed as follows, for example. In forming the spherical portion 41, first, as shown in FIG. 16, the tip portion 43 of the wire 13 wound around the tip portion 15 is extended along the winding axis L. Then, the tip portion 43 is melted by irradiating the heated tip portion 43 with a laser and heating it. If it does so, a melted part will become spherical by surface tension, and the spherical part 41 will be formed by cooling the melted part which became spherical.

  Note that heating can be performed using a burner, a heated hand, or the like in addition to laser irradiation. Moreover, also about the spherical part provided in the front-end | tip part 14 of the jig | tool side edge part 5, the front-end | tip part of the wire 13 wound around the front-end | tip part 14 is extended along the winding axis L, and the spherical part mentioned above is mentioned. It can be formed by means similar to 41.

(Fourth embodiment of contact)
Furthermore, the contact can be configured as a contact 50 shown in FIG. FIG. 17 is an enlarged cross-sectional view of the inspection jig 1 and shows a front view of the contact 50. In FIG. 17, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted. As shown in FIG. 17, the contact 50 is a folded portion in which the tip of the wire 13 forming the contact 50 on the side of the circuit board P is folded back from the tip of the contact 50 toward the main body 12. 51 is configured as an inspection side end. The folded portion 51 includes side portions 52 and 53 disposed with the winding shaft L interposed therebetween, and an arc portion 54 that connects the side portion 52 and the side portion 53.

  The circular arc portion 54 is in contact with the circuit electrode P1. By forming the tip portion of the folded portion 51 with the arc portion 54, the contact between the contact 50 and the circuit electrode P1 of the circuit board P can be made more reliable. The contact of the contact 50 to the circuit electrode P1 is performed by aligning the relative positions of the inspection jig 1 and the circuit board P so that the winding axis L of the contact 50 is positioned at the center of the circuit electrode P1 (recess P3). It is preferable to carry out in the state. However, when the relative positions of the inspection jig 1 and the circuit board P are not aligned, the arc portion 54 may come into contact with the resist P2 as shown in FIG. Even in such a case, when the arc portion 54 contacts the edge portion P4 on the concave portion P3 side of the resist P2, the arc portion 54 slides on the edge portion P4 as shown in FIG. It can enter P3 and contact the circuit electrode P1. Thus, by providing the arc portion 54 in the folded portion 51, the contact between the contact 2 and the circuit electrode P1 of the circuit board P can be made more reliable.

  Note that the maximum width W1 (see FIG. 17) in the direction of sandwiching the winding axis L between the side portion 52 and the side portion 53 is set to be narrower than the inner diameter M1 (see FIG. 7) of the small-diameter hole 17. When the inspection jig 1 is moved to the circuit board P side with the folded portion 51 in contact with the circuit electrode P1, the spring winding portion 22 is compressed and the folded portion 51 is displaced upward. As described above, since the maximum width W1 in the direction of sandwiching the winding axis L between the side portion 52 and the side portion 53 is set to be narrower than the inner diameter M2 of the small diameter hole 17, the folded portion 51 is placed in the accommodation hole 3. I can get in. Therefore, the upward displacement of the folded portion 51 is not hindered.

  In addition, as shown in FIG. 17, the contact 50 is a folded portion in which the tip end portion on the electrode 6 side of the wire 13 forming the contact 50 is folded back in a hook shape from the tip end side of the contact 50 to the main body portion 12 side. 55 is configured as a jig side end. The folded portion 55 includes side portions 56 and 57 arranged with the winding axis L in between, an arc portion 58 connecting the side portion 56 and the side portion 57, a bent portion 59 formed at the tip of the side portion 57, and the like. Have.

  The arc portion 58 contacts the electrode 6. By forming the tip portion of the folded portion 55 at the arc portion 58, the contact between the contact 2 and the circuit electrode P1 of the circuit board P can be made more reliable. That is, for example, even when there is a step portion between the electrode 6 and the electrode holder 7 and the arc portion 58 of the folded portion 55 abuts on this step portion, the contact between the contact 2 and the electrode 6 is prevented. It can be done reliably.

  Is the maximum width W2 from the winding axis L of the side portion 57 equal to ½ of the inner diameter M2 (see FIG. 7) of the large-diameter hole 16 before the folded portion 55 is arranged in the large-diameter hole 16? It is set a little wider than that. For this reason, when the folded portion 50 is inserted into the large diameter hole 16, a force that pushes the folded portion 50 into the large diameter hole 16 is slightly applied to press the folded portion 50 into the large diameter hole. Therefore, even when the electrode holder 7 is detached from the container 4 and the surface of the container 4 to which the electrode holder 7 is attached is directed downward, the contact 50 is removed from the container hole 3. It will not fall out.

  In a state where the bent portion 59 is in contact with the step portion 25, a part of the tightly wound portion 21 of the main body portion 12 and the folded portion 51 protrude downward from the lower surface of the container 4, and the arc of the folded portion 55. The vertical lengths of the folded portion 51, the folded portion 55, etc. are set so that a part of the portion 58 protrudes upward from the upper surface of the container 4. A part of the arc portion 58 protrudes upward from the upper surface of the container 4 so that the arc portion 58 can come into contact with the electrode 6 when the electrode holder 7 is attached to the container 4.

  In a state in which the folded portion 55 is accommodated in the large-diameter hole 16, the bending portion 59 is bent toward the winding shaft L so that the distal end portion 60 of the bending portion 59 is positioned on the winding shaft L side with respect to the step portion 25. It has been. Therefore, when the contact 50 is pulled toward the folded portion 51, the inclined surface 61 of the bent portion 59 can get over the step portion 25, and the contact 50 can be taken out from the small diameter hole 17 side.

  Further, the side portion 57 can be elastically displaced in the direction orthogonal to the winding axis L due to the spring property of the wire rod 13, and the distance D between the side portion 56 and the side portion 57 can be changed. Therefore, as shown in FIG. 20, the contact 50 can be inserted into the small-diameter hole 17 from the folded-back portion 55 side. That is, when the folded portion 55 is inserted into the small diameter hole 17, the side portion 57 is displaced to the winding axis L side, and the distance D between the side portion 56 and the side portion 57 is narrowed. Therefore, the contact 50 can be inserted from the small diameter hole 17 side. When the folded portion 55 reaches the large-diameter hole 16 through the small-diameter hole 17, the space D between the side portion 56 and the side portion 57 is widened, and the bent portion 59 is in contact with the step portion 25. The positioning of the contact 50 in the vertical direction is performed.

  Thus, the contact 50 can be taken out or inserted from the small diameter hole 17 side. Therefore, it is possible to remove and attach the contact 50 to the housing hole 3 without removing the electrode holder 7 from the housing 4.

  The contacts 2, 30, 40, and 50 described above are preferably plated with gold. By applying the gold plating, the electrical resistance of the contacts 2, 30, 40, 50 can be reduced. Further, by performing gold plating, the wire members 13 that are in contact with each other at the tightly wound portions 21 of the respective contacts 2, 30, 40, and 50 are fixed to each other by gold plating, and the tightly wound portions 21 can be made difficult to be deformed. . Therefore, the guide by the inner peripheral surface of the accommodation hole 3 (small-diameter hole 17) of the tightly wound portion 21 is more reliably performed, and the inspection side end portion 10 can be prevented from being shaken back and forth. Therefore, for example, it is possible to prevent poor contact with the circuit electrode P <b> 1 due to the inspection-side end portion 10 swaying back and forth.

DESCRIPTION OF SYMBOLS 1 ... Inspection jig | tool 2,30,40,50 ... Electric contact 3 ... Accommodating hole 4 ... Housing 5 ... Jig side edge part 10 ... Inspection side edge part 12 ... Main-body part 13 ... Wire rod 14, 15 ... Tip part 16 ... Large diameter hole (large diameter accommodating part)
17 ... Small diameter hole (small diameter accommodating part)
19, 26 ... tip part 21 ... tightly wound part 22 ... spring wound part (spring part)
DESCRIPTION OF SYMBOLS 23 ... Large diameter part 25 ... Step part 31 ... Columnar part 41 ... Spherical part 51 ... Folded part P ... Circuit board (inspection object)
L ... winding axis

Claims (6)

It is used in an inspection jig for inspecting the electrical characteristics of an inspection object, and is an electric contact arranged inside a receiving hole of the inspection jig,
The electrical contact is composed of a wire,
An inspection-side end portion arranged on one end side in the length direction of the electrical contact and contacting the inspection object;
A jig-side end portion arranged on the other end side with respect to the one end side and contacting a contact of the inspection jig;
Connecting the inspection side end and the jig side end, and having a main body portion accommodated in the accommodation hole,
At least one of the inspection-side end and the jig-side end is configured such that the wire is wound in a spring shape so that the winding diameter decreases toward the tip, and the winding pitch angle of the tip is 0 degrees. And
In the main body portion, the wire rods closely contact each other between a spring portion wound so that the wire rod spirally has a spring property on the jig side end portion side, and the spring portion and the inspection side end portion. Has a tightly wound part wound like
A part of the spring part of the main body part has a large diameter part having a winding diameter larger than the winding diameter of the other part of the spring part so as to be press-fitted into the housing part, and the main body part The portion other than the large-diameter portion is a small-diameter portion having a diameter slightly smaller than the inner diameter of the housing portion.
An electrical contact characterized by that. The electrical contact according to claim 1,
At least one tip portion of the inspection-side end portion or the jig-side end portion is bent from the arc portion around which the wire is wound to the side of the winding shaft, and passes through the winding shaft.
An electrical contact characterized by that. The electrical contact according to claim 1 or 2,
The length of the tightly wound portion is 4 times the amount of displacement in the winding axis direction at the time of inspection of the tip end portion of the inspection side end portion, and the length of the spring portion is 6 times.
An electrical contact characterized by that. The electrical contact according to any one of claims 1 to 3,
The electrical contact is coated with gold plating,
An electrical contact characterized by that. In the inspection jig for inspecting the electrical characteristics of the inspection object by bringing an electric contact into contact with the inspection object,
A housing having a housing for housing the electrical contact;
The electrical contact is the electrical contact according to any one of claims 1 to 4.
Inspection jig characterized by that. In the inspection jig for inspecting the electrical characteristics of the inspection object by bringing an electric contact into contact with the inspection object,
A housing having a housing for housing the electrical contact;
The electrical contact is the electrical contact according to any one of claims 1 to 3,
The accommodating portion includes a large-diameter accommodating portion that accommodates a large-diameter portion of the electric contact and a small-diameter accommodating portion that accommodates a small-diameter portion other than the large-diameter portion of the spring portion. At the boundary portion between the diameter accommodating portion and the small diameter accommodating portion, a step portion with which the large diameter portion abuts is formed.
Inspection jig characterized by that.

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