JP5345598B2 - Inspection jig and contact - Google Patents

Description

The present invention relates to a contact and an inspection jig that are in contact with an inspection terminal provided in an electronic component such as a printed wiring board.

A general configuration for inspection of a printed wiring board will be described with reference to FIG. The inspection jig 1 is disposed between the printed wiring board to be inspected and the inspection apparatus, and ensures electrical conductivity and inspects electrical characteristics such as resistance value. A contact holder 20 that holds a plurality of contacts 10 that are in conductive contact with inspection terminals of a printed wiring board to be inspected, and an electrode portion 40 that has electrodes that support the contact holder 20 and are in conductive contact with the contacts 10. It is connected to an inspection device via a connector 46. The configuration that enables the contact holder 20 and the electrode unit 40 to be separated is effective for manufacturing and maintenance.

A specific structure of the contact 10 of the inspection jig 1 will be described with reference to FIG. The contact 10 includes a contact needle 11 and a coil spring 14 and is in conductive contact with the electrode 41 at the end of the lead wire 44. The contact needle 11 is held by the first guide plate 21 and the second guide plate 22, the coil spring 14 is held by the coil spring holding plate 23, and the electrode 41 is bonded to the electrode hole 411 of the electrode plate 42 by an adhesive 411a. Has been. In order to avoid a contact failure due to a positional deviation between the electrode 41 and the coil spring 14, a gap 51 is provided on the outer periphery of the electrode 41 to ensure conductive contact between the electrode 41 and the coil spring 14.

However, since this electrode 41 is an enameled wire coated on a single copper wire and protrudes from the periphery, its physical strength is weakened, and it is difficult to repair and difficult to handle if damaged in manufacturing and maintenance.

In Patent Document 2, although the configuration is slightly different from that in FIG. 10, the electrode hole 411 around the enameled wire is filled with the adhesive 411 a and bonded, so that a displacement occurs and the relative position with respect to the coil spring 14. Since the deviation cannot be ignored, a conductive contact member (reference numeral 2 in FIG. 2) having a conical tip is disposed between the coil spring 14 and the electrode 41 so that the center of the coil spring 14 is in contact with the electrode 41. . However, since one part is added, the manufacturing cost is increased accordingly, and the labor for assembly and maintenance is also increased.

In Patent Literature 3, a coil spring (Reference No. 3 Numeral 22) is tapered to the electrode of the cylindrical member (Reference No. 3 413) and contacted with the inner end surface of the cylindrical member to ensure engagement. Conductive contact. However, a cylindrical member electrode is required, which increases the cost.

In Patent Document 4 (Examples 3 and 5), (FIGS. 3 and 5), the conductive contact (References 4 and 15) is composed of a lower needle-like body (References 4 and 13 and References 19 and 19) and a coil spring ( The reference numeral 16) is soldered, and one end of the coil spring (reference numeral 16a) is configured to protrude from the opening of the insulator (reference numeral 7a). However, it is not easy to process the end of one end (reference numeral 16a) if the coil center diameter is small.

As a prior art of a contactor having a minimum number of parts, in Patent Document 5, a probe (reference numeral 1 in Reference 5) is formed in a coil shape, and one end is extended to a central axis, and a terminal is processed into a cone. The tip and the other end also extend to the other end of the central axis and are processed into a conical contact with the electrode. However, the end treatment on both sides of the coil spring is complicated and difficult to manufacture.

In Patent Document 6, both ends of a coil spring are provided with tapered tapered portions that are tightly wound, and the terminal is formed into a small-diameter winding. Both ends protrude from the coil spring holder and are held in pressure contact with the electrode and the inspection terminal. Then, conductive contact is made. However, the minimum outer diameter of the small-diameter winding has a limit of four times the wire diameter due to the characteristics of the coil spring, which is a limitation of a fine coil spring having a small coil center diameter. Although it is effective when the surface area of the inspection terminal is large or protruded, it is difficult to make contact with the inspection terminal having a small area or having a resist on the periphery.

In Patent Document 7 (FIGS. 2, 3, 4, 6, 7), a terminal contact portion (Reference 7, Reference 7, 57) is provided at the center of a contact pin (Reference 7, Reference 51) of a coil spring. There are also examples used for burn-in testing. However, there is a possibility of dents and wrinkles on the inspection terminal of the object to be inspected during pressure contact, and there is a limit to the range of use.

Examples of improving the DC resistance and inductance (AC resistance) of the electrical characteristics of the contact are shown in Patent Document 8 to FIG. The plunger 141 and the coil spring unit 145 are coaxially overlapped and held by a contact pin 140 used for the IC socket for the gorge pitch IC package and held by the IC socket.

The tip of the terminal portion 142 comes into contact with an inspection terminal such as a solder ball of the IC package to be inspected, and the terminal of the tightly wound portion 148 of the coil spring unit 145 comes into contact with an electrode connected to the inspection device. The wide portion 143 of the mandrel 141 is used by locking the IC socket and the coil spring unit 145. The mandrel portion 144 slides and expands and contracts with the inner periphery of the tightly wound portion 147 to improve the internal resistance of the contact pin (contactor) 140 at the time of inspection. However, as in Patent Document 6, it is necessary to ensure the outer diameter of the electrode corresponding to the narrow winding portion.

As a terminal of a similar coil spring, in Patent Document 9, there is a reduced-diameter densely wound portion (Reference 9 code 5c) (Reference 9 FIG. 7). However, the inconvenience is the same as in Patent Documents 6 and 8.

As a prior art having a conical shape that ensures conductive contact with an electrode, Patent Document 10 has a base end portion (Reference 10 reference 3b) of a receiving pin (Reference 10 reference 3). However, the number of parts increases, the processing of the receiving pin (reference 10 3) is complicated, and the manufacturing cost increases.
As described above, various efforts have been made to the inspection jig 1 and the contactor 10, there is a problem, respectively.

JP 2009-476636 A JP 2007-322136 A JP 2010-25665 A Japanese Patent No. 2532331 JP 2004-163364 A Japanese Patent No. 3414593 JP 2007-194187 A Japanese Patent No. 3768183 Japanese Patent No. 3326095 Japanese Patent No. 3369492

In recent years, downsizing of electronic equipment has progressed, and miniaturization and high density of printed wiring boards, electronic parts, etc. have progressed, and the cost of contacts has increased in inverse proportion to the increase in inspection terminals and miniaturization of inspection intervals. As a result, the cost of inspection jigs has risen and cost reduction has become an important issue.
The present invention has been made in view of the above-mentioned problems. It is easy to manufacture and can be manufactured inexpensively as well as easy to maintain, ensuring the conductive contact between the contact and the electrode, and the electrical characteristics of the contact. It is an object of the present invention to provide an inspection jig and a contact for energizing a printed wiring board capable of improving DC resistance and AC inductance.

An inspection jig according to the first aspect of the present invention is an inspection jig including a contact whose tip is in contact with an inspection terminal provided in an electronic component such as a printed wiring board, and an electrode portion connected to the inspection device. The electrode part is a connector connected to the inspection device, and the electrode wired from the connector is arranged on the surface of the electrode plate coaxially with the coil spring, and the contact is made up of a conductive contact needle and a coil spring in series. The contact needle consists of a tip, protrusion, large-diameter part, and relay part, and the coil spring consists of a relay end, spring constant part, and electrode end, and is held by a contact holder and can be attached to and detached from the electrode plate It is mounted and has an initial load. The contact holder is composed of a guide plate that guides and locks the contact needle to the inspection terminal and a coil spring holding plate that holds the coil spring. Bent and there is a cut near the center It is characterized in.

An inspection jig according to a second aspect of the present invention is an inspection jig including a contact whose tip is in contact with an inspection terminal provided in an electronic component such as a printed wiring board, and an electrode portion connected to the inspection device. The electrode part is a connector connected to the inspection device, the electrode wired from the connector is arranged in series with the coil spring on the surface of the electrode plate, the contact consists of a conductive contact needle and a coil spring, The contact needle has a tip, a protruding part, and a relay part. The coil spring consists of a relay end, a spring constant part, and an electrode end. The outer periphery of the relay part and the inner periphery of the relay end are connected to form a connection part. A coil spring that holds a coil spring and a guide plate that is held by the contact holder and is detachably mounted on the electrode plate and has an initial load, and the contact holder guides and locks the contact needle to the inspection terminal. It consists of a holding plate and the electrode end of the coil spring is at the end Bent Oite central direction, characterized in that there is cut near the center.

The contact according to the third aspect of the present invention is a contact that makes contact between an inspection terminal provided on an electronic component such as a printed wiring board and the tip, and makes contact between the electrode end and an electrode connected to the inspection device. The contact needle is composed of a conductive contact needle and a coil spring, the contact needle is composed of a tip, a protrusion, a large diameter portion, and a relay portion, and the coil spring is composed of a relay end, a spring constant portion, and an electrode end. It is held by the holding body and is brought into pressure contact with the electrode and the inspection terminal to be in conductive contact, and the electrode end of the coil spring is bent in the center direction at the terminal and is cut near the center.

The contact according to the fourth aspect of the present invention is a contact that makes contact between an inspection terminal and a tip provided in an electronic component such as a printed wiring board and contacts an electrode end and an electrode connected to the inspection device. The contact needle is composed of a conductive contact needle and a coil spring, the contact needle is composed of a tip, a projecting portion, and a relay portion, and the coil spring is composed of a relay end, a spring constant portion, and an electrode end. The inner periphery of the end is connected to form a connecting portion and is integrated, held by the contact holder and pressed into contact with the electrode and the inspection terminal, and the electrode end of the coil spring is bent toward the center at the terminal. And there is a cut near the center.

The contact according to the fifth aspect of the present invention is the contact according to the second or fourth aspect, wherein the contact needle extends continuously to the opposite side of the projecting portion with the extension of the coil spring. It has the extended part which guides.

The contact according to the sixth aspect of the present invention is characterized in that, in the contact according to any one of the first to fifth aspects, the relay end of the coil spring is reduced in diameter.

The contact according to the seventh aspect of the present invention is the contact according to any one of the first to sixth aspects, wherein the cutting line that cuts the electrode end of the coil spring is the center direction or the circumference of the coil spring. It is in the direction.

The contact according to an eighth aspect of the present invention is the contact according to any one of the first to seventh aspects, wherein the contact needle of the contact and the coil spring are arranged in series or in superposition. And

The contact according to a ninth aspect of the present invention is the contact according to any one of the first to eighth aspects, wherein the contact needle has a large diameter portion between the protruding portion and the relay portion. To do.

The contact according to the tenth aspect of the present invention is the contact according to any one of the first to ninth aspects, wherein the contact needle does not have a large-diameter portion for locking.

As an effect common to the invention, since the end face of the electrode end of the coil spring is in the vicinity of the center of the coil spring, the electrode end of the contact held by the contact holder even when the electrode of the electrode portion is small or misaligned Therefore, the reliability of inspection can be ensured. And since it is easy to manufacture and maintain an inspection jig with a fine inspection interval, the cost can be reduced over the long term.

According to the first aspect of the present invention , the guide plate is detachable in the assembly and maintenance of the inspection jig, and replacement of defective contacts is easy. Coil end treatment and energization ensure conductive contact inside the inspection jig, which is suitable for cost reduction. The position and height of the tip are guided to minimize dents and wrinkles on the inspection terminal. In addition, by inclining the contact needle, the distance between the electrode and the inspection terminal can be converted to easily inspect the minute distance. In some cases, a small change in the inspection terminal can be handled by changing the guide plate.

According to the second aspect of the present invention, if the contact holder is integrated with a plurality of insulating plates, it is convenient for the inclination of the contact. If the number of guide plates is one, the configuration becomes simple. Easy to design and manufacture according to customer's required specifications.

According to the third aspect of the present invention , the contact needle and the coil spring are separated from each other, so that the assembly can be performed in parallel and the construction period is shortened. The protruding part and the large-diameter part have a large diameter, and it is easy to cope with inspection terminals for through holes.
According to the fourth aspect of the present invention , the contact needle and the coil spring are electrically connected at the connecting portion, and the internal electrical characteristics of the contact are improved.

According to the fifth aspect of the present invention, since the extending portion guides the expansion and contraction of the coil spring coaxially and makes conductive contact, the ratio of improving the DC resistance and the inductance of the coil spring is large. And the efficiency of transmission of the load of a coil spring from an electrode to an inspection terminal is good, and the conductive contact of both ends is ensured. Both ends of the contactor function as a coaxial cone, which is convenient as a contactor.

According to the sixth aspect of the present invention, the contact needle can be easily processed from the rod-shaped member, and an integral contact can be made without joining such as welding. Further, when joining such as welding, the processing of the contact needle becomes simpler and the cost is reduced. Convenient for gripping or engaging with the relay section.

According to the seventh aspect of the present invention, the range of use of the electrodes having the same diameter is expanded from the condition where the contact load of the contactor is small to the case where the contact load is large, and the design and manufacture become easy.
Since the effect of each aspect of the present invention is to cut the common means near the center of the electrode end of the coil spring, there is a common matter that can be the effect of other aspects .

According to the eighth aspect of the present invention , physical and electrical properties are improved when polymerized. If the electrical characteristics meet customer requirements, manufacturing is easy and cost is reduced.
According to the ninth aspect of the present invention , the large diameter portion ensures locking. Maintenance is easy because the contacts are integrated.
According to the tenth aspect of the present invention, since the contact needle does not have a large diameter portion, the processing of the contact needle is easy and the cost is reduced.

FIG. 1 is an explanatory view showing the overall configuration of an inspection jig showing an embodiment of the present invention. FIG. 2 is a cross-sectional view of the inspection jig according to Embodiment 1 of the present invention. FIG. 3 is an enlarged view showing a coil spring showing an embodiment of the present invention. FIG. 4 is an explanatory view schematically showing a use state of electrode ends of the coil spring according to the embodiment of the present invention. FIG. 5 is a cross-sectional view of an inspection jig according to Embodiment 4 of the present invention. FIG. 6 is a sectional view of an inspection jig according to Embodiment 6 of the present invention. FIG. 7 is a sectional view of an inspection jig according to Embodiment 7 of the present invention. FIG. 8 is a sectional view of an inspection jig according to Embodiment 9 of the present invention. FIG. 9 is a cross-sectional view of an inspection jig according to Embodiment 10 of the present invention. FIG. 10 is a cross-sectional view showing a conventional inspection jig. FIG. 11 is a cross-sectional view showing a conventional contact. FIG. 12 is a cross-sectional view of the contact in Embodiments 11, 12, and 13 of the present invention.

The inspection jig 1 that reliably contacts the contact 10 and the electrode 41 of the electrode portion 40 and improves the electrical characteristics can be easily manufactured and maintained.
(Embodiment 1)

As shown in FIG. 1, the inspection jig 1 according to the embodiment of the present invention has a plurality of contacts 10 held by a contact holder 20 and detachably attached to an electrode plate 42. An electrode 41 shown in FIG. 2 is arranged on the electrode plate 42 coaxially with the coil spring 12 of the contact 10 and fixed to the support 43. The support body 43 is fixed to the jig base plate 45 together with the connector 46. The electrode 41 and the connector 46 are wired by lead wires 44 to form the electrode portion 40. The inspection jig 1 is mounted on the inspection apparatus and electrically connected via the connector 46. The tip 111 of the contact 10 can be pressed against the inspection terminal of the printed wiring board to be inspected, and the electrical characteristics can be measured.

The internal configuration will be described with reference to FIGS. The contact 10 is formed by arranging a contact needle 11 and a coil spring 12 in series. The conductive metal contact needle 11 includes a tip 111, a protruding portion 112, a large diameter portion 113, and a relay portion 114. The tip 111 is a 60-degree cone in order to ensure conductive contact. The protruding portion 112 protrudes from the first guide plate 21 of the contact holder 20 so as to be extendable and contractable, and ensures press contact with the inspection terminal of the printed wiring board to be inspected. The large-diameter portion 113 has a diameter larger than that of the first guide hole 211 and the second guide hole 221 that function to be locked because the large-diameter portion 113 is held by the contact holder 20. The first guide hole 211 and the second guide hole 221 correspond to a specific example of the “guide part” of the present invention . Further, the lower end edge portion of the first guide hole 211 with which the upper surface of the large diameter portion 113 abuts corresponds to a specific example of the “locking portion” of the present invention. The relay portion 114 extends to the opposite side of the projecting portion 112, engages with the coil spring 12 at the end face of a 90 ° cone, and makes conductive contact. The material is SK4 and the surface treatment is gold-plated, but each may be changed according to the use conditions together with the tip shape.

The contact needle 11 is held by the first guide plate 21 and the second guide plate 22. The first guide plate 21 is formed with a first guide hole 211 for guiding the tip 111 to the inspection terminal of the printed wiring board to be inspected and a first through hole 212 through which the large diameter portion 113 can move. The second guide plate 22 is formed with a second through hole 222 through which the large-diameter portion 113 can move and a second guide hole 221 that guides the coil spring 12 coaxially. The first guide plate 21 and the second guide plate 22 are fixed by screws to form a guide plate 25.

The coil spring 12 is a conductive metal such as a piano wire, and is held by a coil spring holding plate 23 by urging the contact needle 11. A coil spring holding hole 231 in which the coil spring 12 can be expanded and contracted is formed in the coil spring holding plate 23 coaxially with the second guide hole 221 and the electrode hole 411. The surface treatment of the coil spring 12 is preferably gold plating to ensure conductive contact. The holding hole 231 I In the coil corresponds to a specific example of the "cylindrical cavity" of the present invention.

The electrode 41 is planarized by inserting a lead wire 44 such as an enamel wire into an electrode hole 411 coaxial with the coil spring holding hole 231 on the electrode plate 42 and fixing with an adhesive 411a. In the figure, the coil spring 12 and the electrode 41 are in conductive contact in the vicinity of the coaxial center. The surface treatment of the electrode 41 is also preferably gold plating in order to ensure conductive contact.

When the electrode 41 is fixed, if the clearance between the thin lead wire 44 and the electrode hole 411 is increased, insertion and adhesion are facilitated, but the displacement of the electrode 41 is increased. Although this manufacturing method causes a positional shift corresponding to a clearance appropriate for manufacturing, an individual part is not required as the electrode 41 and the interval can be reduced.

Since the contact 10 is held by the contact holder 20 and is mounted on the electrode part 40, the coil spring 12 is biased and has an initial load before the press contact. This is in a state in which the relay end 122 of the internal contact of the contact 10 and the electrode end 121 are in conductive contact, and reliable conductive contact of a large number of contacts 10 can be ensured. Further, since the contact needle 11 is locked, the height of the protruding portion 112 can be made uniform and small, which is convenient for the inspection terminal trace, the flaw and the life of the inspection jig 1.

The coil spring 12 of the present invention will be described with reference to FIG. The coil spring 12 includes a relay end 122 that engages with the end face of the relay portion 114 of the contact needle 11, a spring constant portion 123 having the expansion and contraction characteristics of the coil spring 12, and an electrode end 121 that is in conductive contact with the electrode 41. The terminal processing of the relay end 122 is a closed end non-polishing.

The electrode end 121 is bent so as to cross the coil spring center line 125 as a terminal treatment , and is cut in the vicinity of the coil spring center line 125. In terms of production specifications, an end point where the electrode end 121 and the electrode 41 are in contact with each other is a coil spring center line 125. The coil spring 12 has an easy shape in which manufacturing errors (variations), restrictions on the coil winding machine, and the like are recognized within a usable range . 3 (a) is a front view, and FIG. 3 (b) is a bottom view, FIG. 3 (c) Ru Oh in right side view. 3, wire diameter d, the coil center diameter D, the spring index (c = D / d) is the minimum fine wound spring constant portion 123 of the 3, shows how the end face treatment of the electrode end 121 . Electrode end 121 is direction Tsu river without being particularly sharply bent, crosses the coil spring center line 125.

Since the electrode end 121 is in the vicinity of the coil spring center line 125, the tolerance of relative displacement between the electrode 41 and the coil spring 12 can be increased. This can correspond to the electrode 41 formed by bonding the lead wire 44 that may be misaligned, the electrode 41 having a small area, and the like, which facilitates the manufacture of the inspection jig 1 having a fine inspection interval. It will be.

FIG. 4 schematically shows an enlarged view of the contact state of the electrode end 121 with the electrode 41. FIG. 4 (a) is cut with a double-edged cutter as the end points of cut lines 121a at a position where the wire of the coil spring 12 crosses the coil spring center line 125 is at the apex of the cone of the coil spring center line 125. Since the end face of the electrode end 121 is sharply formed by cutting, reliable conductive contact can be achieved even with a low load. The contact angle θ with the electrode 41 is preferably 60 degrees from the same open end angle as the spring constant portion 123. FIG. 4B is a bottom view thereof. The wire is deformed at the time of cutting, and the length of the cutting line 121a becomes wider than the wire diameter, but is not particularly shown in FIG. The electrode end 121 has a substantially conical shape, which is convenient as the contact 10.

In FIG. 4C, the cutting line 121 a is formed in the circumferential direction of the coil spring center line 125. The contact end surface of the electrode end 121 becomes the circumference of the wire rod of the coil spring 12 by cutting and is not a sharp end of the cutting wire 121a. Therefore, when the load of the coil spring 12 is large and the physical strength of the electrode 41 is weak, it is long-term. It is advantageous to obtain a stable conductive contact. FIG . 4D is a bottom view thereof.

Assembly and maintenance of the contact holder 20 and the contact 10 will be described with reference to FIGS. The coil spring holding plate 23 is aligned and mounted on the electrode plate 42 of the electrode portion 40 that has been assembled including the attachment of the lead wire 44 by the adhesive 411a . Then, the coil spring 12 is inserted into all the coil spring holding holes 231 with the electrode end 121 facing forward. In parallel with this operation, the second guide plate 22 is slightly lifted and the contact needle 11 is inserted into all the second through holes 222 in the forward direction. Then, the first guide plate 21 is aligned and screwed. The guide plate 25 is attached to the coil spring holding plate 23 with overlapping screws. This completes the assembly of the inspection jig 1.

In the replacement operation of the contact 10, the guide plate 25 is removed and the defective coil spring 12 is replaced. Then, the guide plate 25 is slightly lifted, the first guide plate 21 is removed, and the defective contact needle 11 is replaced. When aligning the respective plates, although not shown in the drawing, since the mechanical position is determined by aligning the alignment pin and the alignment hole, the operation is easy.
(Embodiment 2)

When inspecting an inspection terminal having a minute interval smaller than the interval between the electrodes 41, the first guide hole 211 and the second guide hole 221 are shifted in a non-coaxial manner in FIG. It can arrange | position in series with the spring 12, and can respond | correspond by making the space | interval with the adjacent front-end | tip 111 small. Further, when the design of the printed wiring board to be inspected is partially changed and the position of the inspection terminal is slightly shifted, it may be possible to cope with the problem by exchanging the first guide plate 21 and the second guide plate 22. When the shift distance is large, the length of the guide plate 25 and the contact needle 11, the position of the large diameter portion 113, and the like can be changed although not shown in the drawing.
(Embodiment 3)

When inspecting a printed wiring board having a through hole, a through hole land may exist as an inspection terminal. There is a hole in the through-hole land, and the protruding portion 112 of the contact 10 enters the hole, resulting in poor contact. Therefore, the contact needle 11 of the protruding portion 112 having a diameter larger than the hole diameter is required. The coil spring 12 also has an increased load, wire diameter, and outer diameter. Even when a small-diameter contact 10 used for an inspection terminal such as a surface-mount land without a hole is mixed, the range that can be handled by the electrode 41 having the same diameter is expanded, and the ease of design and manufacture is increased. When the physical strength of the coil spring 12 having a large load is not sufficient, the circumferential cutting in FIG.
(Embodiment 4)

A modification of the contact needle 11 will be described with reference to FIG. The outer diameter of the rod-shaped contact needle 11a is substantially the same as the coil center diameter D of the coil spring 12, and the relay portion 114a is cut to a diameter slightly larger than the inner diameter of the coil spring 12a by about 2 mm from the locking position. The terminal is a 90 degree cone. The terminal treatment of the relay end 122a of the coil spring 12a is preferably a closed end polishing in order to ensure the locking. The relay portion 114a of the contact needle 11a is press-fitted into the relay end 122a to the locking position and is gripped to form the connecting portion 115. Thus, the connected integrated contact 10a is obtained. Since the outer diameter of the relay end 122 a is larger than the diameter of the second guide hole 221, the relay end 122 a is locked to the second guide plate 22.

Since the contact needle 11a has fewer cutting parts than the contact needle 11, the cost is reduced. The connection between the relay portion 114a and the relay end 122a is gripped, but may be a conductive joint. The connecting portion 115 functions as the large diameter portion 113. Since the diameters of the first through-hole 212 and the second through-hole 222 do not have the large-diameter portion 113, it is preferable that the first through-hole 212 and the second through-hole 222 be slightly larger than the first guide hole 211 and the second guide hole 221. Compared to the first embodiment , the locking position is moved from the first guide hole 211 to the second guide hole 221. And the assembly and maintenance procedures change.

For the assembly and maintenance, the relay portion 114a of the contact needles 11a press-fitted into the relay end 122a of the coil spring 12a is first prepared a contact 10a of the integral. Next, the first guide plate 21, the second guide plate 22, and the coil spring holding plate 23 are overlapped and aligned and screwed to obtain a contact holder 20. The coil spring holding plate 23 and the upper side, and the tip 111 of the contact 10a forward (i.e., toward Ke downward) inserting the contacts 10a to all of the coil spring holding hole 231. The assembled electrode part 40 is installed at 90 degrees. The contact holder 20 to which the contact 10a is mounted is aligned with the electrode plate 42 and fixed with screws. This completes the assembly of the inspection jig 1.

To replace the defective contact 10a, the inspection jig 1 is installed at 90 degrees, the contact holder 20 is removed, the defective contact 10a is taken out, and the non-defective contact 10a is inserted. When handling the contact holder 20 inserted with the contact 10a alone, care should be taken because all the contacts 10a fall when the coil spring 12 is lowered, but the procedure is simple and easy. .
(Embodiment 5)

In a modification of the fourth embodiment, the tip of the rod-like member and the end face of the relay portion are processed into a cone to form a contact needle, and the inner diameter of the coil spring 12a is made approximately equal to that of the rod-like contact needle. The end 122a is inserted to the locking position and joined by welding or the like to form the connecting portion 115 to form an integral contact. In FIG. 5, the outer shape of the relay portion 114 a continues in a rod shape up to the protruding portion 112. The processing of the contact needle is easier than in the fourth embodiment . Since the contact needle and the coil spring 12 become an integral contact, the assembly and maintenance are the same as in the fourth embodiment . (Embodiment 6)

The contact needle 11b shown in FIG . The extension portion 116 is continuous with the relay portion 114a of the fourth embodiment, has a slightly smaller diameter than the inner diameter of the coil spring 12, the coil spring 12a Oite on the opposite side, when pressing the protrusion 112 It is extended to a length that the electrode end 121 do not interfere. The extending portion 116 is in conductive contact with the coil spring 12a while sliding on the inside of the coil spring 12a that expands and contracts and guides the expansion and contraction coaxially by the end face of the 90 ° cone .

At the time of pressure contact, when the coil spring 12a is compressed, the extending portion 116 slides with the spring constant portion 123 to guide the compression coaxially and make conductive contact. The portion of the electrode end 121 of the coil spring 12a remains as a direct current resistance and alternating inductance component when energized, but since the portion of the spring constant portion 123 is not added, the ratio of improvement in electrical characteristics is large.

Since the contact needle 11b of the contact 10b and the coil spring 12 extend and contract coaxially, the end point of the electrode end 121 that contacts the electrode 41 is in the vicinity of the center of the contact needle 11b. The interference with the coil spring holding hole 231 can be avoided, and the load of the coil spring 12 can be efficiently transmitted to the electrode 41 and the inspection terminal to ensure the conductive contact.
(Embodiment 7)

In FIG. 7, the first guide hole 211, the second guide hole 221, and the coil spring holding hole 231 are shifted not coaxially, and the contact 10 b is slightly tilted to slightly shift the position of the tip 111 and the position of the electrode 41. ing.

It shows that the positions of the tip 111 and the center line 411b of the electrode hole 411 are A-shifted. The first guide plate 21 processes the first guide hole 211 at the position of the inspection terminal, shifts the first through hole 212 from the opposite surface by a predetermined value, and connects the holes. The second guide plate 22 is shifted by a predetermined value to process the second through hole 222, and the second guide hole 221 is shifted from the opposite surface by a predetermined value to be processed to connect the holes.

The coil spring holding plate 23 is processed by shifting the coil spring holding hole 231a by a predetermined value. The coil spring holding hole 231 is processed by shifting the coil spring holding hole 231 by a predetermined value from the opposite surface to connect the holes. Although the coil spring holding hole 231 and the coil spring holding hole 231a of the connecting hole are shifted, the coil spring 12 is guided by the extending portion 116, so there is no interference at the connecting end. The electrode plate 42 is processed by shifting the electrode hole 411 by a predetermined value.

Even if the design of the printed wiring board to be inspected is partly changed and the position of the inspection terminal is slightly shifted, it is possible to cope with this by replacing the first guide plate 21, the second guide plate 22, and the coil spring holding plate 23. May be possible. This is an example in which the contact needle 11b of the contact 10b and the coil spring 12 operate coaxially so that both ends can be used as a cone. Since the entire length of the contact 10 is inclined, the position conversion efficiency is good. And the range of application can also be expanded by changing the length, diameter, etc. of the contact needle 11.
(Embodiment 8)

With the same technical idea as in the fifth embodiment, the tip of the rod-shaped member and the end surface of the extending portion are processed into a cone to form a contact needle, and the inner diameter of the coil spring 12a is made slightly larger than the rod-shaped contact needle, and the coil spring 12a The connecting end 115a is inserted to the locking position and joined by welding or the like to form the connecting portion 115. In FIG. 6, the outer shape of the extended portion 116 is continuous in a rod shape with the same diameter up to the relay portion 114 a and the protruding portion 112. Processing of contact needle is simplified.
(Embodiment 9)

This will be described with reference to FIG. Relay portion 114c of the contact needles 11c formed from rod-like member is approximately the line diameter of the coil spring 12, a smaller diameter than the projecting portion 112, a length of about 2mm from the position of the locking. The extending portion 116 is processed so as to return to the diameter of the original rod-like member in a tapered shape. The relay end 122c of the coil spring 12c whose diameter has been reduced is press-fitted to the locking position and is gripped to form the connecting portion 115 and be held together by the contact holder 20 so that the relay end 12 2c also has a locking function. It is easy to process the contact needles 11c, joined by welding for connection is not required.

The inner diameter of the spring constant portion 123 of the coil spring 12c is guided to extend and contract by the extending portion 116 that is slightly larger than the outer diameter of the rod-shaped member. The relay end 122c is closed-end polished with a diameter reduced by about 1.5 times the wire diameter d.
(Embodiment 10)

In the example shown in FIG. 9, one guide plate 21 is used as the guide plate 25. The configuration of the contact holder 20 is simple and convenient, for example, when the contacts are arranged vertically. For assembly and maintenance, the coil spring holding plate 23 is fixed to the electrode plate 42, a contact is inserted, and the first guide plate 21 is aligned and fixed. It is convenient because you can work from above.

The contact 10d is integrally formed by joining the relay portion 114d and the relay end 122c by welding or the like to form a connecting portion 115. In the same connection diagram as in Examples 5 and 8, the coil spring 12a is gripped as a coil spring 12c having a relay end 122c having a reduced diameter to facilitate manufacture. The diameter of the contraction may be as much as it is gripped.
(Embodiment 11)

In the example shown in FIG. 12A, the contact needle 11 and the coil spring 12 are used for superposition. Relay unit 114 has a diameter not slightly smaller than an inner diameter of the coil spring 12, which also functions extending portion 116 to guide the expansion and contraction of the coil spring 12. Cost will be reduced if the electrical characteristics of the contacts meet customer requirements. The contact holder 20 preferably has the configuration shown in FIG. Further, when the contact needle 11 and the coil spring 12c are used and the relay end 122c having a reduced diameter is press-fitted, a single contact is obtained.
(Embodiment 12)

In the example shown in FIG. 12B , the contact needle 11e includes a tip 111, a protruding portion 112, a large diameter portion 113, a relay portion 114a, and an extension portion 116, and a coil spring 12 having an appropriate inner diameter is press-fitted into the relay portion 114a. Even if it is gripped, it becomes a single contact and maintenance is easy. Further, the extending portion 116 may be omitted.
(Embodiment 13)

FIG. 12C shows another example of the engagement between the relay portion 114 and the relay end 122c when the contact needle 11f and the coil spring 12c are arranged in series. The relay portion 114f has a large diameter and also serves as the large diameter portion 113. The relay portion 114f is stepped into a 90 ° conical end surface to guide the reduced diameter relay end 122c to ensure engagement. The relay portion 114f may have a large diameter and a conical stepped end surface, and a flat surface or the like may be formed with a large diameter with a press or the like in consideration of cost. Increasing the length of the protrusion 112 is convenient for inclination.

The relay portion 114, the large diameter portion 113, and the protruding portion 112 may have the same diameter. Although it is held by the contact holder 20 and is not locked, there is no initial load and the reliability of the internal connection is lowered, but the processing is simple and the cost is reduced. The coil springs may be coil springs 12 and 12a having no reduced diameter. An extending portion 116 may be provided.

In the example described above, it constitutes a coil spring holding plate 23 by one, in the form status of other embodiments may be plural. Three or more guide plates may be used. An interval may be provided.

In the first embodiment , the end treatment at the relay end of the coil spring 12a is preferably the closed end polishing. Alternatively, the coil spring 12c having a reduced diameter closed end is stably engaged when a stepped process is added to the end face of the relay portion 114, and interference with the coil spring holding hole 231 is avoided and load characteristics are also stabilized.

The contact of the present invention can be used for all inspection devices that are in contact with electrode terminals provided in electronic components such as printed wiring boards, ICs, and IC packages.

The inspection jig can be applied to an energization jig that can use the contact according to the present invention.

1 ... Inspection jig 10, 10a, 10b, 11c, 10d Contact 11, 11a, 11b, 11c, 11d, 11e, 11f Contact needle 111, tip 112, projection 113, large diameter 114, 114a, 114c, 114d, 114f, relay portion 115, connecting portion 116, extension portion 12, 12a, 12c, coil spring 121, electrode end 121a, cutting lines 122, 122a, 122c, relay end 123 ··· Spring constant portion 125 ··· Coil spring center line 20 ··· contact holder 21 ··· first guide plate 22 ··· second guide plate 23 ··· coil spring holding plate 25 ··· guide plate 40 ... Electrode part 41 ... Electrode 42 ... Electrode plate 44 ... Lead wire 46 ... Connector

Claims (8)

A contactor incorporated and used in an inspection jig used for inspection of electronic components, comprising a conductive contact needle and a conductive coil spring,
The contact needle is a tip that is in contact with an inspection site of an electronic component to be inspected, a protrusion that is a shaft-like portion following the tip, and a shaft-like portion that is larger in diameter than the protrusion after the protrusion. It has a diameter part and a relay part that is a shaft-like part having a smaller diameter than the large diameter part following the large diameter part,
The coil spring is arranged in series with the relay portion or on the outer periphery of the relay portion, and one end portion is in contact with and electrically connected to the relay portion or the large diameter portion of the contact needle,
The other end portion is bent three-dimensionally while increasing the pitch angle without substantially reducing the radius of curvature and without being bent suddenly, and changes the direction in the central direction to change the central direction of the coil spring. and in the vicinity of intersecting, Ri endmost there cut,
Diameter of the coil spring, the minimum winding diameter or the winding diameter near Ru contacts close to the minimum winding diameter. A contactor incorporated and used in an inspection jig used for inspection of electronic components, comprising a conductive contact needle and a conductive coil spring,
The contact needle has a tip that comes into contact with an inspection site of an electronic component to be inspected, a protruding portion that is a shaft-like portion following the tip, and a relay portion that is a shaft-like portion following the protrusion.
The coil spring is integrated with the contact needle by connecting an inner periphery with an outer periphery of the relay portion at one end.
The other end portion is bent three-dimensionally while increasing the pitch angle without substantially reducing the radius of curvature and without being bent suddenly, and changes the direction in the central direction to change the central direction of the coil spring. and in the vicinity of intersecting, Ri endmost there cut,
Diameter of the coil spring, the minimum winding diameter or the winding diameter near Ru contacts close to the minimum winding diameter. The contact needle is an extending portion formed by extending the relay portion so as to guide expansion and contraction of the coil spring, and has an extending portion having an outer diameter smaller than the inner diameter of the coil spring. The contact according to 2. A contactor incorporated and used in an inspection jig used for inspection of electronic components, comprising a conductive contact needle and a conductive coil spring,
The contact needle has a tip that comes into contact with the inspection site of the electronic component to be inspected, and a shaft-like portion following the tip.
The coil spring is electrically connected to the contact needle by abutting one end of the coil spring against the end of the shaft-like portion opposite to the tip.
The other end portion is bent three-dimensionally while increasing the pitch angle without substantially reducing the radius of curvature and without being bent suddenly, and changes the direction in the central direction to change the central direction of the coil spring. and in the vicinity of intersecting, Ri endmost there cut,
Diameter of the coil spring, the minimum winding diameter or the winding diameter near Ru contacts close to the minimum winding diameter. The contact according to any one of claims 1 to 4 , wherein the other end is automatically formed as a terminal treatment in a coil winding machine. The contact according to any one of claims 1 to 5 , wherein a cutting line obtained by cutting the other end portion is in a center direction or a circumferential direction. An inspection jig used for inspecting an electronic component, wherein the contact according to any one of claims 1 to 6 , a contact holder holding the contact, and connected to the contact holder An electrode portion,
The contact holder supports a guide portion that slidably supports the contact needle in an axial direction so that the tip is exposed, and the large diameter portion of the contact needle or the one end portion of the coil spring. Including a locking portion that locks a predetermined protrusion or more of the tip by contacting, and a cylindrical cavity portion that houses the coil spring,
The electrode portion is fixed to the electrode plate so as to penetrate the electrode plate and the electrically insulating electrode plate connected to the contact holder, and one end surface of the electrode portion contacts the outermost end portion of the coil spring. An inspection jig comprising: a shaft-like conductive electrode that is electrically connected by contact and urges the coil spring. The electrode plate has a through-hole coaxial with the electrode plate side of the cylindrical cavity, the electrode having a diameter smaller than the maximum diameter of the contact, inserted into the through-hole, and The inspection jig according to claim 7 , wherein the inspection jig is fixed to the through hole with an adhesive.

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