JP2008089399A - Probe for burn-in tests, and probe assembly for burn-in tests - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the defect of the tip or the breakage of the probe and to improve the durability of the probe. <P>SOLUTION: The probe for the burn-in test formed with the metallic material showing toughness comprises a needle main body and the needle tip part provided with the needle main body. The needle tip part is provided with a lamination structure of a first metallic material layer showing higher hardness than the tough metallic material forming the needle main body and a second metallic material showing excellent toughness than the first metallic material layer. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an energization test probe suitable for use in an energization test of a large number of semiconductor integrated circuits built in a semiconductor wafer, and a probe assembly incorporating the probe.

  A large number of semiconductor integrated circuits built in a semiconductor wafer are generally subjected to an energization test as to whether or not they are manufactured according to specifications before being separated into chips. In this energization test, a probe assembly including an energization test probe connected to an electrode of an object to be inspected, which is each semiconductor integrated circuit, is used, and the object to be inspected is connected to a tester through the probe assembly.

  A conventional probe used in this probe assembly includes a plate-like probe main body portion and a needle tip portion that is provided on the probe main body portion and comes into contact with an electrode of an object to be inspected (for example, a patent) Reference 1). The probe main body includes an attachment portion to the probe substrate, a pair of arm portions extending from the attachment portion to the lower side of the probe substrate and spaced laterally from the probe substrate, and both the arm portions. A pedestal portion formed integrally with the arm portion to connect the tip, and the needle tip portion is provided on the pedestal portion. According to Patent Document 1, the probe main body is formed of a tough conductive material, and the needle tip provided at the lower end of the pedestal portion of the probe main body is formed of a high-hardness metal material having excellent hardness. Proposed.

  By forming the probe body with a metal material with excellent toughness, when the probe tip is pressed against the electrode of the object to be inspected, the elastic deformation of the arm part of the probe body is increased to make the needle tip appropriate. And it can connect to the said electrode reliably. Further, when an overdrive force that causes the elastic deformation described above is applied to the probe arm portion, the needle tip of the needle tip portion slides on the electrode along with the elastic deformation of the arm portion. By forming the tip portion with a high-hardness material, wear of the needle tip is suppressed, and deterioration of the durability of the probe due to wear is prevented.

  However, if the fine needle tip that protrudes from the lower surface of the pedestal is made of a high-hardness metal material, the brittleness of the needle tip will be damaged or broken when a load is applied to the needle tip. It may cause to occur. Therefore, it has been desired to surely prevent the needle tip portion from being broken or broken.

International Publication No. 2006/075408 Pamphlet

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to prevent the probe tip from being broken or broken and to improve the durability of the probe.

  The present invention is an energization probe including a needle main body portion formed of a metal material exhibiting toughness and a needle tip portion provided on the needle main body portion, and the needle tip portion forms the needle main body portion. It has a laminated structure of a first metal material layer exhibiting higher hardness than a tough metal material and a second metal material layer exhibiting toughness superior to that of the first metal material layer.

  In the present invention, since the needle tip portion is formed by a laminated structure of a first metal material layer having high hardness and a second metal material layer having higher toughness than this, the first high hardness The stickiness lacking in the metal material is compensated by the second metal layer. Therefore, since the probe having the needle tip portion which is excellent in wear resistance and does not cause breakage or breakage is provided, the durability thereof is enhanced.

  The needle body portion may be formed in a plate shape, and the needle tip portion may be formed in a laminated structure in which the needle body portion is laminated in the plate thickness direction of the needle body portion. Accordingly, the probe of the present invention can be formed relatively easily using, for example, a photolithography technique and an electroplating method.

  The second metal material layer can be formed of a tough metal material that forms the needle body. By making the material of the second metal material layer and the needle body portion common, the needle body portion and the second metal material layer of the needle tip portion can be integrated, so that the probe manufacturing equipment In addition to simplification of the above, the mechanical coupling strength between the needle body portion and the needle tip portion can be increased.

  The thickness dimension of the first metal material layer is preferably larger than that of the second metal material layer. Thereby, the abrasion resistance required for the needle tip can be more reliably provided.

  A pedestal portion on which the needle tip portion is provided may be formed on the needle main body portion, and the second metal material layer of the needle tip portion may be integrally formed of the same material as the pedestal portion. This common use of the metal material also makes it possible to integrate the needle main body portion and the second metal material layer of the needle tip portion. The mechanical bond strength with the tip can be increased.

  The needle tip portion may have a laminated structure such as a sandwich having the first metal material layer and a pair of the second metal material layers covering both surfaces of the metal material layer. In this case, since both surfaces of the first metal material layer having high hardness are covered with the second metal material layer having high toughness, the first metal material layer between the second metal material layers is broken or damaged. It is difficult to suffer from causing trauma, and it is possible to effectively prevent a decrease in durability due to the brittleness of the needle tip.

  The needle main body includes an attachment portion similar to that in the prior art, a pair of arm portions extending laterally from the attachment portion in the height direction thereof, and a pedestal portion connected to the arm portion And can be formed. The pedestal portion is formed by extending the pedestal portion to the side opposite to the side where the attachment portion is located when viewed from the arm portion so as to connect the extended end of the arm portion, and the extended end of the pedestal portion The needle tip portion is formed at the top.

  The probe according to the present invention can be incorporated into a conventional probe assembly for current test.

  According to the present invention, as described above, both the metal material layers are formed by forming the needle tip portion with a laminated structure of the first metal material layer having high hardness and the second metal material layer having excellent toughness. Since both of these characteristics can be effectively exhibited, the wear resistance of the probe tip can be improved and the chipping or breakage of the probe can be prevented, thereby improving the durability of the probe.

  As shown in FIG. 1, the probe assembly 10 according to the present invention is used for energization tests of a large number of integrated circuits (not shown) formed on a semiconductor wafer 12. The semiconductor wafer 12 is detachably held on, for example, the vacuum chuck 14 with a large number of electrodes 12a formed on one surface thereof facing upward. The probe assembly 10 is connected to the vacuum chuck 14 in a direction toward and away from the semiconductor wafer 12 on the vacuum chuck 14 for a current test of the integrated circuit formed on the semiconductor wafer 12 on the vacuum chuck 14. And is supported by a frame member (not shown) so as to be relatively movable.

  The probe assembly 10 includes a printed wiring board 16 and a probe board 20 laminated on the printed wiring board via a ceramic substrate 18. A large number of probes 22 according to the present invention are aligned and attached to one surface of the probe substrate 20. The ceramic substrate 18 and the probe substrate 20 are printed via a well-known mounting ring assembly 24 made of a dielectric material such as ceramic so that the probe 22 attached to the probe substrate faces downward. The printed wiring board 16 is assembled so as to be laminated on the lower surface of the board 16.

  A reinforcing member 26 made of a metal material and allowing partial exposure of the upper surface of the printed wiring board 16 is disposed on the upper surface of the printed wiring board 16. Although not shown, the probe board 20, the ceramic board 18, the printed wiring board 16, the reinforcing member 26, and the mounting ring assembly 24 are integrally assembled by a conventional coupling member such as a bolt.

  Although not shown, the probe substrate 20 is formed with a well-known conductive path, and the probe 22 is attached to the probe substrate 20 so as to be fixedly connected to the corresponding conductive path. Yes. The respective conductive paths of the probe substrate 20 corresponding to the probe 22 are respectively formed through the ceramic substrate 18 and the printed wiring board 16 as is well known (none is shown). And is electrically connected to a socket (not shown) arranged in a region exposed from the reinforcing member 26 on the upper surface of the printed wiring board 16, and is connected to a circuit of a tester main body (not shown) via the socket. ing.

  Therefore, by moving the probe assembly 10 and the vacuum chuck 14 close to each other so that each probe 22 of the probe assembly 10 abuts the corresponding electrode 12a of the semiconductor wafer 12 that is the object to be inspected, The electrode 12a can be connected to the circuit of the tester main body, and an energization test of the device under test 12 can be performed.

  Referring to FIG. 2 in which each probe 22 is enlarged, each probe 22 includes a flat probe body portion 22a made of a metal material such as nickel or a nickel chromium alloy and a hard metal material such as rhodium. And a needle tip portion 22b having a base layer. Both these portions 22a and 22b exhibit relatively good conductivity. The probe main body portion 22a made of nickel or a nickel chromium alloy is richer in toughness than rhodium constituting the base layer of the needle tip portion 22b. On the other hand, this rhodium has higher hardness than the metal material constituting the probe main body portion 22a.

  The probe body 22a is made of a highly tough metal material having excellent toughness such as a nickel alloy such as a nickel phosphorus alloy, a nickel tungsten alloy, and a nickel cobalt alloy, phosphor bronze, and a palladium cobalt alloy in addition to the above-described metal materials. Can be formed. Further, the base layer of the needle tip portion 22b can be appropriately formed of a highly hard metal material other than rhodium.

  In the illustrated example, the probe main body portion 22a includes a rectangular attachment portion 28 whose lateral direction is the length direction, a connection portion 30 extending downward from one side of the attachment portion, and a connection portion 30 extending from the connection portion. Arm portions 32, 32 extending laterally at a distance from the lower edge, and a pedestal portion 34 connected to the extended end of the arm portion. In the illustrated example, as the arm portion, a pair of arm portions 32, 32 formed at a distance from each other in the height direction of the attachment portion 28, that is, the extending direction of the connecting portion 30, is formed. A pedestal portion 34 that connects the extended ends of the arm portions 32, 32 extends to the side opposite to the side where the attachment portion 28 is located when viewed from the pair of arm portions 32.

  The extended end of the pedestal portion 34 is a flat end surface 34a, and a needle tip portion 22b is provided so as to protrude from the end surface. As shown in FIG. 2 (a), the needle tip portion 22b includes a base portion 36 having a trapezoidal planar shape that gradually decreases its lateral dimension in the protruding direction, and a pair of parallel base portions. And a columnar portion 38 having a rectangular planar shape extending from the short side of the opposite side. In the example shown in FIGS. 2A and 2B, the front end surface of the column body portion 38 is a flat surface 38 a that is substantially perpendicular to the axis of the column body portion 38. For example, the height dimension H protruding from the pedestal portion 34 of the needle tip portion 22b is 35 ± 3 μm, and the thickness dimension T of the needle tip portion 22b is about 15 μm or 12.5 μm. The lateral dimension L is 15 ± 2 μm. These dimensions H, T, and L can be appropriately selected. Moreover, the front end surface of the columnar part 38 can be protruded spherically downward, and the front end of the columnar part 38 can be a pointed tip.

  As shown in FIG. 2B and FIG. 3, the needle tip portion 22 b has a laminated structure having the above-described highly rigid base layer over the entire base portion 36 and column portion 38. That is, in the example shown in FIG. 2 and FIG. 3, the needle tip portion 22 b covers the first metal material layer 40 a made of a hard metal material such as rhodium described above, and both sides of the metal material layer as a base layer. It has a three-layer structure including a pair of second metal material layers 40b and 40b arranged. Each layer 40a and 40b is laminated | stacked sequentially in the plate | board thickness direction of the probe main-body part 22a. The pedestal of the probe main body portion 22a is located on the edge side including the long side of the pair of parallel opposite sides of the base portion 36 so that the columnar portion 38 of the needle tip portion 22b protrudes from the end surface 34a of the pedestal portion 34. It is embedded in the portion 34. Thus, the needle tip portion 22b is fixed to the probe main body portion 22a.

  Both the second metal material layers 40b of the needle tip portion 22b are made of a metal material rich in toughness, and are fixed to each other with the first metal material layer 40a between the two layers. Both the second metal material layers 40b are designed to integrate both the metal material layers 40b and the probe main body portion 22a in order to increase the bonding strength between the needle tip portion 22b and the probe main body portion 22a. For simplification, it is desirable that the probe main body portion 22a is made of the same metal material.

  When the thickness dimension T of the needle tip portion 22b is about 15 μm or 12.5 μm as described above, the second metal material layers 40b and 40b having a thickness dimension t1 of, for example, 1 to 2 μm are formed. The thickness dimension of the first metal material layer 40a is a value obtained by subtracting the thickness dimension t1 of the second metal material layers 40b and 40b from the thickness dimension T of the needle tip portion 22b (T-2t1).

  The first metal material layer 40a made of a hard metal material, which is the base layer of the needle tip portion 22b, is mainly responsible for wear resistance of the needle tip portion as a core material of the needle tip portion 22b. Each of the second metal material layers 40b and 40b covering both side surfaces of the first metal material layer 40a absorbs an impact from the outside due to its toughness, so that the first metal material layer 40a is cracked or scratched. Prevent entry.

  As shown in FIG. 4A, the second metal material layers 40b and 40b can be formed with a thickness dimension t2 of, for example, 2 to 3 μm without changing the thickness dimension T of the needle tip portion 22b. .

  Further, as shown in FIG. 4 (b), two first metal material layers 40a and three second metal material layers 40b are alternately stacked without changing the thickness dimension T of the needle tip portion 22b. By doing so, it is possible to use the needle tip portion 22b having a laminated structure of all five layers. The thickness dimension t1 of the three second metal material layers 40b can be set to the same thickness dimension of 1 to 2 μm, for example, in the example shown in FIG.

  Further, as shown in FIG. 4C, two layers of a single first metal material layer 40a and a single second metal material layer 40b without changing the thickness dimension T of the needle tip portion 22b. The needle tip portion 22b can be formed with a structure. As the thickness dimension t of the single first metal material layer 40a, a desired thickness dimension can be selected within a range of, for example, 1 to 3 μm.

  In any case, a multi-layer structure having the desired number of first metal material layers 40a and second metal material layers 40b is employed to impart desired toughness and wear resistance to the needle tip portion 22b. can do. Further, the thickness dimension of the first metal material layer 40a and the second metal material layer 40b and the thickness dimension T of the needle tip portion 22b can be appropriately set as necessary.

  Each probe 22 according to the present invention is fixed to the probe substrate 20 so that the upper edge of the attachment portion 28 is connected to the conductive path of the probe substrate 20. The probe assembly 10 provided with the probe 22 is used so that the tip surface 38a (see FIG. 1) of the needle tip portion 22b, which is the needle tip of each probe 22, contacts the corresponding electrode 12a as described above. It is done.

  At this time, when one semiconductor wafer 12 is divided into a plurality of chip regions and an energization test is performed with the probe assembly 10 for each chip region, some of the probes 22 are out of the chip region, and the probe tip 38a of the probe 22 is removed. May come to a position corresponding to the inclined edge of the semiconductor wafer 12. In this state, when the probe assembly 10 is pressed against the semiconductor wafer 12 with an overdrive force that causes elastic deformation of the arm portion 32 of each probe 22, the distal end surface 38a of the probe 22 corresponding to the inclined edge becomes the inclined edge. Therefore, an overload accompanied by bending may act on the needle tip portion 22b of the probe 22 due to the guide action of the inclined edge.

  In the probe 22 according to the present invention, even if such an overload acts on the needle tip portion 22b, the tough second metal material layer 40b covering the first metal material layer 40a excellent in wear resistance. Prevents the first metal material layer 40a from being cracked or scratched. Therefore, since the breakage and breakage of the first metal material layer 40a due to the cracks and scratches can be prevented, the tip 22b is prevented from being broken or broken, and the durability of the probe 22 is improved. .

  An example of the manufacturing method of the probe 22 will be described along the manufacturing process diagram of FIG. As shown in FIG. 5A, a photolithographic mask 54 for a sacrificial layer 52 to be removed later is selectively exposed on a well-known photoresist layer on a base 50 having a flat surface made of stainless steel. And a development process. A sacrificial layer material such as copper is deposited to a predetermined thickness on the surface portion of the base 50 exposed from the photolithographic mask 54 by electroplating, whereby the sacrificial layer 52 is formed.

  After removing the photolithographic mask 54, a new second photolithographic mask 56 is formed covering the surface portion of the base 50 and the sacrificial layer 52, as shown in FIG. The second photolithographic mask 56 forms the planar shape of the probe main body portion 22 a including the attachment portion 28 of the probe 22, the coupling portion 30, the pair of arm portions 32, and the pedestal portion 34 on the surface of the base 50.

  On the surface portion exposed from the second photolithographic mask 56 of the base 50, as shown in FIG. 5C, a tough metal material 58 such as nickel chrome, for example, is almost sacrificed by electroplating. Deposited with a thickness equal to 52. By the deposition of the metal material, the entire shape of the probe main body portion 22a is formed on the base 50 to have a thickness of, for example, approximately one third of the thickness dimension of the probe main body portion 22a.

  Thereafter, the second photolithographic mask 56 is removed, and as shown in FIG. 5D, the third photolithographic mask 60 for the needle tip portion 22b is replaced with the sacrificial layer 52 on the base 50, the needle tip reinforcing portion. 40 and a predetermined region of the probe main body 22a are formed to be exposed. The third photolithographic mask 60 partially exposes a predetermined region corresponding to the planar shape of the needle tip portion 22b in the sacrificial layer 52 and the probe main body portion 22a.

  In the region exposed from the third photolithography mask 60, as shown in FIG. 5E, a hard metal material 62 such as rhodium and a metal material 58 having a high toughness are sequentially formed to a predetermined thickness by electroplating. Is deposited. At this time, for example, for the two-layer needle tip portion 22b shown in FIG. 4C, the high-hardness metal material 62 and the high-toughness metal material 58 are sequentially formed so as to form each single layer having a predetermined thickness. Is deposited. Further, for example, in order to form the three-layer needle tip portion 22b shown in FIG. 3 and FIG. 4A or the five-layer needle tip portion 22b shown in FIG. The tough metal material 58 is sequentially and repeatedly deposited to a predetermined thickness according to the required number of layers.

  By depositing the hard metal material 62 and the tough metal material 58, the needle tip portion 22b having a laminated structure of the first metal material layer 40a and the second metal material layer 40b is formed. The needle tip portion 22b deposited by this electroplating method is formed by firmly bonding the first metal material layer 40a and the second metal material layer 40b as they are deposited. Without use, the layers 40a and 40b can be bonded, and the side surface of the needle tip portion 22b and the tough metal material 58 for the probe main body portion 22a can be fixedly and firmly bonded.

  After the formation of the needle tip portion 22b, the third photolithography mask 60 is removed, and a fourth photolithography mask 64 is newly formed as shown in FIG. The third photolithographic mask 60 is a region including a portion embedded in the probe main body portion 22a of the needle tip portion 22b deposited for forming the remaining portion of the probe main body portion 22a, and is a plane of the probe main body portion 22a. The area corresponding to the shape is exposed.

  In the region exposed from the fourth photolithography mask 64, a high-toughness metal material 58 similar to that described above is deposited, thereby forming the remaining portion of the probe main body 22a, as shown in FIG. As shown, the probe 22 including the probe tip portion 22b and the probe main body portion 22a having a multilayer structure as shown in FIGS. 3 to 4 is formed on the base 50. After the photolithography mask 64 surrounding the probe 22 is removed and the sacrificial layer 52 is removed, the probe 22 is peeled off from the base 50.

  The second metal material layer 40b can be formed of a metal material layer made of a tough metal material different from the metal material of the probe main body 22a. However, when the probe 22 is formed using the photolithography technique and the electroplating method described with reference to FIG. 5, as described above, the second metal material layer 40b of the probe main body portion 22a and the needle tip portion 22b. Are formed of the same metal material, a strong bond between the two 22a and 40b can be obtained without using any special bonding means. Further, since the second metal material layer 40b can be simplified in the type of constituent material of the probe 22 as compared with the case where a tough metal material different from the probe main body portion 22a is used, the manufacturing equipment can be simplified. Can be planned.

  Instead of the needle tip portion 22b having a linear cross-sectional shape as shown in FIGS. 3 and 4, it has a conventionally well-known crank-like cross-sectional shape as shown in FIGS. 6 (a) and 6 (b). A laminated structure composed of the first metal material layer 40a and the second metal material layer 40b similar to the above can be applied to the needle tip portion 22b.

  An example of a manufacturing process of the probe 22 having such a crank-shaped cross section needle tip portion 22b is shown in FIG. As shown in FIG. 7A, a photolithography mask 54 for the sacrificial layer 52 is formed on the base 50 similar to that shown in FIG. A sacrificial layer 52 is formed on the surface portion of the base 50 exposed from the photolithography mask 54 by electroplating.

  After the removal of the photolithographic mask 54, a new second photolithographic mask 56 is formed to cover the surface portion of the base 50 and the sacrificial layer 52, as shown in FIG. 7B. At this time, the second photolithographic mask 56 is formed so as to expose a half of the longitudinal direction of the sacrificial layer 52 in order to form the needle tip portion 22b having a crank-shaped cross-sectional shape.

  As shown in FIG. 7C, the surface portion exposed from the second photolithographic mask 56 of the base 50 and the region exposed from the second photolithographic mask 56 on the sacrificial layer 52 are made of high hardness such as rhodium. A metal material 62 and a tough metal material 58 are sequentially deposited to a predetermined thickness by electroplating. In the example shown in FIG. 7C, the hard metal material 62 and the tough metal material 58 are sequentially deposited so as to form each single layer having a predetermined thickness for the two layers of the needle tip portion 22b. However, as in the example described with reference to FIG. 5, the high-hardness metal material 62 and the high-toughness metal material 58 are sequentially and repeatedly deposited to a predetermined thickness according to the required number of layers.

  By depositing the hard metal material 62 and the tough metal material 58, the needle tip portion 22b having a laminated structure of the first metal material layer 40a and the second metal material layer 40b is formed. In the deposition of the high-hardness metal material 62 and the high-toughness metal material 58 for forming the needle tip portion 22b, a step portion is formed by the sacrificial layer 52 in the exposed region of the second photolithographic mask 56. A needle tip portion 22b having a crank-like cross-sectional shape having a multilayer structure as shown in FIGS. 6 (a) and 6 (b) is formed.

  After the formation of the needle tip portion 22b, the second photolithography mask 56 is removed, and a third photolithography mask 60 is newly formed as shown in FIG. This third photolithographic mask 60 is a region including a portion embedded in the probe main body portion 22a of the needle tip portion 22b deposited for forming the probe main body portion 22a, and has a planar shape of the probe main body portion 22a. Expose the corresponding area.

  A high-toughness metal material 58 similar to that described above is deposited on the region exposed from the third photolithographic mask 60, thereby providing the attachment portion 28, the connecting portion 30, the pair of arm portions 32, and the pedestal portion 34. A probe main body 22a is formed. Thereafter, the photolithographic mask 60 surrounding the probe 22 is removed and the sacrificial layer 52 is removed, and then the probe 22 is peeled off from the base 50. As a result, a needle tip portion 22b including a needle tip portion 22b having a crank-like cross-sectional shape having a multilayer structure as shown in FIG. 6 and a probe main body portion 22a is formed.

  The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.

1 is a schematic view showing a probe assembly including a probe having a multi-layered needle tip portion according to the present invention, with a part thereof broken. FIG. FIG. 1 is an enlarged view of the probe shown in FIG. 1, (a) is a front view thereof, and (b) is a side view thereof. It is sectional drawing which expands and shows the needle tip part of the probe shown in FIG. FIG. 4 is a view similar to FIG. 3 showing another specific example of the present invention, in which (a) shows an example of a three-layer structure, (b) shows an example of a five-layer structure, and (c) shows a two-layer structure. An example is shown. It is explanatory drawing which shows the manufacturing process of the probe shown in FIG. 2 thru | or FIG. It is drawing similar to FIG. 4 which shows the other specific example of this invention, (a) shows the example of 2 layer structure, (b) shows the example of 3 layer structure. It is explanatory drawing which shows the manufacturing process of the probe shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Probe assembly 20 Probe board 22 Probe 22a Probe main-body part 22b Needle tip part 28 Attachment part 32 Arm part 34 Base part 38a Flat surface of a needle point 40a 1st metal material layer 40b 2nd metal material layer

Claims (8)

  A needle body portion formed of a metal material exhibiting toughness, and a needle tip portion provided on the needle body portion, wherein the needle tip portion exhibits higher hardness than the tough metal material forming the needle body portion. A probe for energization test having a laminated structure of a first metal material layer and a second metal material layer exhibiting toughness superior to that of the first metal material layer.   The probe for energization testing according to claim 1, wherein the needle main body part is formed of a plate-like member, and the needle tip part has a laminated structure laminated in a thickness direction of the needle main body part.   2. The probe for energization testing according to claim 1, wherein the second metal material layer is made of the same metal material as the tough metal material forming the needle body portion.   The probe for energization testing according to claim 1, wherein a thickness dimension of the first metal material layer is larger than that of the second metal material layer.   2. The energization according to claim 1, wherein the needle main body portion has a pedestal portion on which the needle tip portion is provided, and the second metal material layer is integrally formed of the same metal material as the pedestal portion. Test probe.   2. The probe for energization testing according to claim 1, wherein the needle tip portion has a laminated structure including the first metal material layer and a pair of the second metal material layers covering both surfaces of the metal material layer. .   The needle body includes a mounting portion and a pair of arm portions extending laterally from the mounting portion in the height direction of the needle body portion, and the arm portions to connect the extended ends of the arm portions. 2. The energization according to claim 1, wherein the pedestal part is formed to extend to a side opposite to the side where the attachment part is located when viewed from above, and the needle tip part is formed at an extended end of the pedestal part. Test probe.   An energization test probe assembly comprising: a probe board on which a plurality of conductive paths are formed; and the energization probe according to claim 1 provided on the probe board and electrically connected to the corresponding conductive path.

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