JP6044489B2 - Contact, measuring device - Google Patents

Description

  The present invention relates to a contact used for measuring electrical characteristics of, for example, a resin-encapsulated power device, and a measuring apparatus including the contact.

  Patent Document 1 discloses a contactor that is brought into contact with a lead terminal of an IC package when measuring the electrical characteristics of the IC package. A part of this contact is coated with a non-conductive plastic material for the purpose of avoiding electrical contact with other contacts. The nonconductive plastic material exposes the tip portion of the contact 360 °.

Japanese Patent Laid-Open No. 02-051882

  When measuring the electrical characteristics of the object to be measured through the contact that is brought into contact with the terminal of the object to be measured, if the contact resistance between the terminal and the contact is high, the contact portion between the terminal and the contact becomes high temperature. As a result, there is a problem that the terminal and the contact are melted and bonded at the contact portion, or the contact surface between the terminal and the contact is increased by changing the surface of the contact to form an alloy.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a contact that can reduce the contact resistance between the terminal and the contact, and a measuring device using the contact.

  The contact according to the invention of the present application includes a contact portion formed of a tapered metal having a front surface, a rear surface, a first side surface, and a second side surface, and the contact portion stabbed in a terminal of an object to be measured. A wiping mechanism for wiping the tip portion of the first side surface in parallel with the surface of the terminal and pressing the terminal portion against the terminal, and covering the first side surface, the front surface, the rear surface, and the second side surface excluding the tip portion. And an insulating coating.

  The measuring device according to the invention of the present application includes a contact portion formed of a tapered metal having a front surface, a rear surface, a first side surface, and a second side surface, and the contact portion stabbed in a terminal of the object to be measured. A wiping mechanism for wiping the tip portion of the first side surface in parallel with the surface of the terminal and pressing the terminal portion against the terminal, and covering the first side surface, the front surface, the rear surface, and the second side surface excluding the tip portion. A contact having an insulating coating; a socket fixed to the contact; a measuring unit electrically connected to the contact; and a stage on which the object to be measured is placed. Features.

  According to the present invention, the contact resistance between the terminal and the contact can be reduced.

It is a front view of the contactor concerning Embodiment 1 of the present invention. It is a perspective view of a contact part. It is the front view and side view of a contact part. It is a front view of the measuring apparatus which concerns on Embodiment 1 of this invention. It is a front view which shows the usage method of a measuring apparatus. It is sectional drawing which shows the contact part and terminal in wiping operation | movement. It is a perspective view of the contact part which concerns on Embodiment 2 of this invention. It is a perspective view of the non-conductive contact part and contact part which concern on Embodiment 3 of this invention. It is a perspective view of the contact part which concerns on Embodiment 4 of this invention.

  A contact and a measuring apparatus according to an embodiment of the present invention will be described with reference to the drawings. The same or corresponding components are denoted by the same reference numerals, and repeated description may be omitted.

Embodiment 1 FIG.
FIG. 1 is a front view of a contact 10 according to Embodiment 1 of the present invention. The contact 10 includes a main body 12. The main body portion 12 has an upper end portion 12a and a fixing portion 12b. A spring portion 14 is connected to the main body portion 12. The spring part 14 has a curved shape. A contact portion 16 is connected to the spring portion 14. The contact part 16 is a part in contact with the terminal of the object to be measured. As described above, the contact 10 includes the main body portion 12, the spring portion 14, and the contact portion 16.

  FIG. 2 is a perspective view of the contact portion 16. The contact portion 16 is formed of a tapered metal having a front surface 16a, a rear surface 16b, a first side surface 16c, and a second side surface 16d. The front surface 16a and the rear surface 16b face each other, and the first side surface 16c and the second side surface 16d face each other. A contact portion between the first side surface 16 c and the second side surface 16 d is the tip of the contact portion 16.

  A portion of the first side surface 16c excluding the tip portion 16A, the front surface 16a, the rear surface 16b, and the second side surface 16d are covered with an insulating coating 18. That is, in the contact portion 16, only the tip portion 16 </ b> A of the first side surface 16 c is not covered with the insulating coating 18. The material of the insulating coating 18 is not particularly limited as long as it is a material exhibiting electrical insulation, but is, for example, polyimide coating or DLC (diamond-like carbon).

  FIG. 3A is a front view of the contact portion. When the contact portion 16 is viewed from the front, the whole is covered with an insulating coating 18. FIG. 3B is a side view of the contact portion viewed from the first side surface 16c side. When the contact portion 16 is viewed from the first side surface 16c side, only the tip portion 16A is not covered with the insulating coating 18.

  The contact 10 is manufactured as follows, for example. First, a metal plate is punched to obtain a metal member having the shape shown in FIG. Next, the metal member is plated. Then, an insulating coating 18 is applied as shown in FIG.

  FIG. 4 is a front view of the measuring apparatus according to Embodiment 1 of the present invention. The contact 10 is fixed to the socket 30. The relative position between the contact 10 and the socket 30 is determined by the fixed portion 12 b hitting the socket 30. The socket 30 keeps the contact 10 in a fixed position. A measuring unit 32 is electrically connected to the upper end 12 a of the contact 10. The measuring unit 32 is a part that measures the electrical characteristics of the object to be measured. Below the contact portion 16, a stage 34 on which an object to be measured is placed is provided.

  FIG. 5 is a front view showing how to use the measuring apparatus. First, the DUT 40 is placed on the stage 34. The DUT 40 is, for example, a resin-encapsulated power device having a rated current of about 300A. The DUT 40 includes a lead terminal (hereinafter referred to as a terminal 40a). Next, the stage 34 is raised to bring the contact 10 and the DUT 40 close to each other, and the terminal 40 a is inserted into a part of the contact portion 16. Thereby, the tip portion 16A is buried in the terminal 40a.

  If the stage 34 continues to rise, an elastic force is exerted from the bent spring portion 14 to the contact portion 16, and the contact portion 16 is wiped (referred to as moving in the X direction, hereinafter the same). Here, the spring portion 14 is formed to be curved so as to protrude in the direction opposite to the front side of the first side surface 16c. Therefore, the spring portion 14 wipes the contact portion 16 in a direction parallel to the surface of the terminal 40a and pressing the tip portion 16A of the first side surface 16c against the terminal 40a.

  FIG. 6 is a cross-sectional view showing the contact portion 16 and the terminal 40a during the wiping operation. The contact portion 16 pierced by the terminal 40a is wiped in the direction of the arrow in FIG. The tip end portion 16A of the contact portion 16 is always pressed against the terminal 40a during wiping. FIG. 6 shows that the foreign material 40 b is in contact with the contact portion 16.

  Next, the raising of the stage 34 is stopped. Here, it is assumed that the raising of the stage is stopped in the state shown in FIG. Next, the electrical characteristics of the DUT 40 are measured by the measurement unit 32.

  In the contact 10 according to the first embodiment of the present invention, since the insulating coating 18 is applied to the contact portion 16, only the tip portion 16A of the contact portion 16 is electrically connected to the terminal 40a. And by wiping the contact part 16, it can avoid that the oxide film of the terminal 40a, a foreign material, and the terminal material which peeled off from the terminal hit the front-end | tip part 16A. Moreover, since the wiping direction of the contact portion 16 is a direction in which the tip portion 16A is pressed against the terminal 40a, the tip portion 16A can be brought into close contact with the terminal 40a. Therefore, the contact resistance between the terminal 40a and the tip portion 16A can be lowered.

  Since the front surface 16a, the rear surface 16b, and the second side surface 16d of the contact portion 16 are not surfaces that face the wiping direction, they are not surfaces that are pressed against the terminal 40a during wiping. Therefore, since the contact resistance with the terminal 40 a cannot be lowered on these surfaces, all of these surfaces are covered with the insulating coating 18.

  Further, the portions other than the tip portion 16A of the first side surface 16c are also covered with the insulating coating 18 because the contact resistance may increase due to contact with foreign matter or the like. For example, in the case of FIG. 6, since the insulating coating 18 is applied to the portion other than the tip portion 16A of the first side surface 16c, the adverse effect on the contact resistance due to the foreign matter 40b can be avoided. The range of the tip portion 16A is preferably determined so that the tip portion is positioned at a certain depth of the terminal in consideration of the penetration depth of the contact portion into the terminal.

  The spring portion 14 may be replaced with another one. That is, as long as a wiping mechanism that wipes the contact portion 16 pierced into the terminal 40a in a direction parallel to the surface of the terminal 40a and pressing the tip portion 16A of the first side surface 16c against the terminal 40a, the above-described effect can be obtained. it can. As such a wiping mechanism, an electric device that moves the contact may be provided.

  With respect to an object to be measured having a plurality of terminals, the electrical characteristics can be measured by bringing the contact 10 according to Embodiment 1 of the present invention into contact with each of the plurality of terminals. These modifications can also be applied to contacts and measuring devices according to the following embodiments. In addition, since there are many common points with Embodiment 1 about the contactor and measuring device which concern on the following embodiment, it demonstrates centering on difference with Embodiment 1. FIG.

Embodiment 2. FIG.
FIG. 7 is a perspective view of the contact portion 50 according to Embodiment 2 of the present invention. The contact part 50 has a front surface 50a, a rear surface 50b, a first side surface 50c, and a second side surface 50d. A tip portion 50A is formed on the first side surface 50c. The contact part 50 includes a non-conductive contact part 52 in front of the first side face 50c. The non-conductive contact portion 52 is entirely covered with an insulating coating 54. Only the tip portion 50 </ b> A is exposed at the contact portion 50 from the insulating coating 54. 7 indicates the wiping direction of the contact portion 50.

  According to the contact portion 50, the non-conductive contact portion 52 is wiped prior to the tip portion 50A. Accordingly, the non-conductive contact portion 52 removes the oxide film of the terminal, the foreign material, and the terminal material that has been peeled off from the terminal to the left and right in the wiping direction. Then, the tip portion 50A hits the cleaned portion through the non-conductive contact portion 52. Therefore, the contact resistance between the terminal and the contact can be lowered.

  The non-conductive contact portion is not particularly limited as long as it can be wiped prior to the tip portion. For example, a non-conductive contact portion may be provided as a component independent of the contact portion having the tip portion. Alternatively, the non-conductive contact portion and the contact portion having the tip portion may be connected to separate spring portions, and the two spring portions may be connected to one main body portion.

Embodiment 3 FIG.
The contact according to the third embodiment of the present invention includes a non-conductive contact portion and a contact portion. FIG. 8 is a perspective view of the non-conductive contact portion 60 and the contact portion 62 according to Embodiment 3 of the present invention. The contact part 62 is thinner than the non-conductive contact part 60. That is, the thickness T2 of the contact portion 62 is smaller than the thickness T1 of the non-conductive contact portion 60, and the length of the contact portion 62 in the wiping direction (the length in the arrow direction in FIG. 8) is larger than the length of the non-conductive contact portion 60 in the wiping direction. small. The non-conductive contact portion is entirely covered with an insulating coating, and the function of the non-conductive contact portion is as described in the second embodiment.

  Since the contact part 62 is thinner than the non-conductive contact part 60, the contact part 62 pierces the terminal deeper than the non-conductive contact part 60. Thereby, the possibility that the tip end portion 62A of the contact portion 62 will come into contact with the clean portion of the terminal can be increased.

Embodiment 4 FIG.
FIG. 9 is a perspective view of a contact portion according to Embodiment 4 of the present invention. The contact portion 70 is formed by stacking a plate-like first portion 72, second portion 74, third portion 76, fourth portion 78, and fifth portion 80. The thicknesses T1 to T5 of each part are uniform.

  The front end portion of the contact portion 70 is composed of first to fifth portions 72, 74, 76, 78, 80, and 72A, 74A, 76A, 78A, 80A. The portions of the contact portion 70 excluding the tip portions 72A, 74A, 76A, 78A, 80A are covered with an insulating coating 81. Further, the additional insulating coating 82 covers a portion of the tip portion on the front surface 70a side (tip portion 80A of the fifth portion 80). Further, the additional insulating coating 84 covers a portion on the rear surface 70b side of the tip portion (tip portion 72A of the first portion 72).

  The front surface 70a side or the rear surface 70b side of the front end portion of the contact portion 70 tends to leave foreign matters or the like as compared with the central portion of the front end portion. Therefore, by providing the additional insulating coatings 82 and 84 as in the fourth embodiment of the present invention, the contact resistance between the terminal and the contact can be lowered.

  The contact portion 70 is formed by overlapping five plate-like members, but the present invention is not limited to this. The thickness of the contact portion is appropriately adjusted so that the tip portion after the additional insulating coating can be in contact with the terminal over a relatively wide area. In addition, you may combine the characteristic of each embodiment demonstrated so far suitably.

  DESCRIPTION OF SYMBOLS 10 Contact, 12 Body part, 14 Spring part, 16 Contact part, 18 Insulation coating, 30 Socket, 32 Measuring part, 34 Stage, 40 Measured object, 40a Terminal, 40b Foreign object, 50 Contact part, 52 Non-conducting contact part 54 Insulating coating, 60 Non-conductive contact portion, 62 Contact portion, 70 Contact portion, 82, 84 Additional insulating coating

Claims (7)

A contact portion formed of a tapered metal having a front surface, a rear surface, a first side surface, and a second side surface;
A wiping mechanism for wiping the contact portion pierced by the terminal of the object to be measured in a direction parallel to the surface of the terminal and in a direction of pressing the tip portion of the first side surface against the terminal;
A contactor comprising: an insulating coating covering the first side surface excluding the tip portion, the front surface, the rear surface, and the second side surface.   2. The contactor according to claim 1, wherein the wiping mechanism includes a spring portion that is curved to be convex in a direction opposite to the front side of the first side surface and connected to the contact portion.   The contact according to claim 1 or 2, further comprising a non-conductive contact portion entirely covered with an insulating coating in front of the first side surface.   The contact according to claim 3, wherein the contact portion is thinner than the non-conductive contact portion.   5. The contactor according to claim 1, further comprising an additional insulating coating that covers the front side portion of the tip portion and the rear side portion of the tip portion.   The contact according to claim 1, wherein the insulating coating is a polyimide coating or DLC (diamond-like carbon). A contact portion formed of a tapered metal having a front surface, a rear surface, a first side surface, and a second side surface, and the contact portion pierced by a terminal of an object to be measured are parallel to the surface of the terminal and the first A contactor comprising: a wiping mechanism that wipes a tip portion of a side surface in a direction in which the tip portion is pressed against the terminal; and an insulating coating that covers the first side surface, the front surface, the rear surface, and the second side surface excluding the tip portion. When,
A socket fixed to the contact;
A measurement unit electrically connected to the contact;
And a stage on which the object to be measured is placed.

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