Elastic sheet and testing device compatible with multiple sizes of QFN (Quad Flat No-lead) packaging

Abstract

The utility model relates to the field of chip testing devices, in particular to an elastic sheet and a testing device compatible with multiple sizes of QFN (Quad Flat No-lead) packaging. The testing device comprises a contact part, a first connecting part, a first bending part, a second connecting part, a second bending part, a third connecting part and a positioning part, one end part of the contact part is connected with one end part of the first connecting part; one end, far away from the contact part, of the first connecting part is connected with one end part of the first bending part; the other end of the first bending part is connected with one end of the second connecting part; the other end of the second connecting part is connected with the second bending part; the other end of the second bending part is connected with one end of the third connecting part; the positioning part comprises a first positioning part and a second positioning part, the first positioning part and the second positioning part are connected on the same straight line, a first barb is arranged on the end face of one side of the first positioning part, and the end of the first positioning part is connected with the side end face, away from the second connecting part, of the third connecting part. The elastic sheet structure is optimized, the elastic sheet type is simplified, and operation is simpler and more convenient.

Description

Technical Field

[0001] The utility model relates to the field of semiconductor chip electrical property detection devices, in particular to a spring and a testing device compatible with QFN packages of various sizes. Background Art

[0002] QFN is the abbreviation of "Quad Flat No-leads Package", which means a square flat no-lead package, which is one of the surface mount packages. The package is equipped with electrode contacts on the four sides, which occupies a relatively small area and is relatively low in height. In order to match various types of chips, there are 9 types of shrapnel used in the existing QFN package test equipment, which has too many types, is cumbersome to use, and is inconvenient to operate.

[0003] Therefore, it is necessary to provide a testing device compatible with various sizes of QFN packages to simplify solving at least one of the above technical problems. Utility Model Content

[0004] In order to overcome the problems of too many types of spring pieces, complicated use and inconvenient operation, the utility model provides a spring piece and a testing device compatible with various sizes of QFN packages.

[0005] In order to solve the above technical problems, the present utility model provides the following technical solutions:

[0006] A spring piece includes a contact portion, a first connecting portion, a first bending portion, a second connecting portion, a second bending portion, a third connecting portion and a positioning portion;

[0007] The contact portion and the first connecting portion are both strip-shaped structures, and one end of the contact portion is connected to one end of the first connecting portion;

[0008] An end of the first connecting portion away from the contact portion is connected to an end portion of the first bending portion;

[0009] The first bending portion is fan-shaped and is bent in a direction away from the other end of the contact portion, and the other end of the first bending portion is connected to one end of the second connecting portion;

[0010] The second connecting portion is in a strip shape, and the other end thereof extends toward the connection point between the contact portion and the first connecting portion and is connected to the second bending portion;

[0011] The second bending portion is fan-shaped and bends in a direction away from the connection point between the contact portion and the first connecting portion. The other end of the second bending portion is connected to one end of the third connecting portion. The third connecting portion is strip-shaped.

[0012] The positioning portion is a strip-shaped structure, including a first positioning portion and a second positioning portion. The first positioning portion is connected to the second positioning portion on the same straight line. A first barb is provided on one side end face of the first positioning portion. The end of the first positioning portion is connected to the side end face of the third connecting portion away from the second connecting portion.

[0013] As a further solution of the present utility model: the positioning portion is connected to the third connecting portion at one end of the third connecting portion close to the second bending portion.

[0014] As a further solution of the utility model: the positioning portion is connected to the third connecting portion at a center position of the third connecting portion.

[0015] As a further solution of the present utility model: the positioning portion is connected to the third connecting portion at an end of the third connecting portion away from the second bending portion.

[0016] A testing device compatible with various sizes of QFN packages comprises a spring sheet group, wherein the spring sheet group comprises a plurality of the spring sheets mentioned above.

[0017] As a further solution of the utility model: it includes a base, a floating needle plate and a grounding probe, the floating needle plate includes a needle plate and a fixing strip, the needle plate is a rectangular plate-shaped structure, a first through hole for installing the grounding probe is arranged in the center, a plurality of second through holes arranged in 10 squares are arranged around the first through hole, 5 second through holes are arranged on each side of the innermost circle, 6 second through holes are arranged on each side of the outer circle, and then 8, 10, 12, 14, 16, 18, 20, and 22 second through holes are arranged in each circle toward the outer layer, and a plurality of third through holes are arranged on the base, and the third through holes are used to position the second positioning part.

[0018] As a further solution of the utility model: it also includes a chip limiting frame, which is arranged on the floating needle plate. The chip limiting frame is a rectangular plate structure with a square through hole in the middle, wherein a square limiting frame is arranged around the through hole in one plane, and the square limiting frame has slopes on four sides toward the center of the square.

[0019] As a further solution of the utility model: two lever-type pressing plates for pressing the chip are arranged on the base.

[0020] As a further solution of the utility model: it also includes an upper cover and a spring, the four corners of the upper cover are respectively provided with a first column, the first column is arranged toward the base, the four sides of the upper cover are provided with limit strips, the inner side of the end of the limit strip is provided with a barb, the limit strip is arranged toward the base, the four corners of the base are provided with blind holes matching the first column, the spring is placed in the blind hole and sleeved on the outside of the first column, and the base is provided with a first groove corresponding to the limit strip.

[0021] As a further solution of the utility model: second grooves are arranged on both side end surfaces of the pressing plate, four second columns are arranged on the upper cover, and the second columns are installed in the second grooves.

[0022] The utility model relates to a spring and a testing device compatible with various sizes of QFN packages, which have the following beneficial effects:

[0023] Due to the optimized shrapnel structure, the operation is inconvenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. The drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the following specific implementation methods, they are used to explain the present application, but do not constitute a limitation to the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work. Elements or components with the same reference numerals in the drawings are represented as similar corresponding elements or components. Unless otherwise stated, the dimensions in the drawings do not constitute a proportional limitation.

[0025] Figure 1 This is a schematic structural diagram of the first embodiment of the spring piece of the utility model;

[0026] Figure 2 This is a schematic structural diagram of the second embodiment of the spring piece of the utility model;

[0027] Figure 3 This is a schematic structural diagram of the third embodiment of the spring piece of the utility model;

[0028] Figure 4 This is the assembly drawing of the floating needle plate of the utility model;

[0029] Figure 5 This is a schematic diagram of the structure of the floating needle plate of the utility model;

[0030] Figure 6 This is a top view of the floating needle plate of the utility model;

[0031] Figure 7 It is an enlarged view of the A part of the utility model;

[0032] Figure 8 It is a schematic diagram of the base structure of the utility model;

[0033] Fig. 9 This is a bottom view of the base of the utility model;

[0034] Fig.10 It is an enlarged view of part B of the utility model;

[0035] Fig.11 It is an enlarged view of the C part of the utility model;

[0036] Fig.12 This is the assembly diagram of the chip limit frame of the utility model;

[0037] Fig.13 This is a schematic diagram of the chip limit frame structure of the utility model;

[0038] Fig.14 It is the assembly drawing of the pressing plate of the utility model;

[0039] Fig.15 This is a schematic diagram of the structure of the test device of the utility model that is compatible with various sizes of QFN packages;

[0040] Fig.16 It is a schematic diagram of the upper cover structure of the utility model.

[0041] In the figure: 100-first spring sheet, 110-contact portion, 11a-first chamfer, 120-first connecting portion, 130-first bending portion, 140-second connecting portion, 150-second bending portion, 160-third connecting portion, 170-positioning portion, 171-first positioning portion, 171a-first barb, 172-second positioning portion, 172a-second chamfer, 180-first positioning point, 200-second spring sheet, 280-second positioning point, 300-third spring sheet, 380-third positioning point, 400-base, 410-base bottom plate, 411-through hole fifth zone, 412-through hole sixth zone, 413-through hole seventh zone, 414-through hole eighth zone, 420-third through hole, 43 0-fourth through hole, 440-blind hole, 450-first limit block, 460-second limit block, 470-first groove, 480-hook, 500-floating needle plate, 510-needle plate, 511-first through hole area, 512-second through hole area, 513-third through hole area, 514-fourth through hole area, 515-first through hole, 516-second through hole, 520-fixing bar, 600-grounding probe, 700-chip limit frame, 710-square through hole, 720-square limit frame, 72a-slope, 810-pressing plate, 820-rotating shaft, 910-upper cover, 911-first column, 912-limiting bar, 912a-second barb, 913-second column, 920-spring. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the utility model more clear, the following is a further detailed description of a spring and a test device compatible with various sizes of QFN packages of the utility model in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0043] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "center", "longitudinal", "lateral", "up", "down", "left", "right", "inside", "outside", "front end", "rear end", "head", "tail", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0045] like Figure 1 As shown, a spring piece is in the form of a thin sheet, including a contact portion 110, a first connecting portion 120, a first bending portion 130, a second connecting portion 140, a second bending portion 150, a third connecting portion 160 and a positioning portion 170. Preferably, the contact portion 110, the first connecting portion 120, the first bending portion 130, the second connecting portion 140, the second bending portion 150, the third connecting portion 160 and the positioning portion 170 have the same thickness;

[0046] The contact portion 110 and the first connecting portion 120 are both strip-shaped structures, one end of the contact portion 110 is connected to one end of the first connecting portion 120, and the other end of the contact portion 110 is provided with a first chamfer 11a to facilitate insertion of the floating needle plate 500. Preferably, the contact portion 110 is vertically connected to the first connecting portion 120;

[0047] An end of the first connecting portion 120 away from the contact portion 110 is connected to an end of the first bending portion 130. Preferably, the first connecting portion 120 and the first bending portion 130 have the same width and are connected in a smooth transition;

[0048] The first bending portion 130 is fan-shaped, preferably semicircular, and is bent in a direction away from the first chamfer 11a at the other end of the contact portion 110. The other end of the first bending portion 130 is connected to one end of the second connecting portion 140.

[0049] The second connecting portion 140 is in a strip shape, and the other end thereof extends toward the connection point between the contact portion 110 and the first connecting portion 120 , and is connected to the second bending portion 150 , and extends toward the first connecting portion 120 ;

[0050] The second bending portion 150 is fan-shaped, and is bent in a direction away from the connection point between the contact portion 110 and the first connecting portion 120. The fan-shaped radius of the second bending portion 150 is larger than the fan-shaped radius of the first bending portion 130. The other end of the second bending portion 150 is connected to one end of the third connecting portion 160, and the third connecting portion 160 is strip-shaped.

[0051] The positioning portion 170 is a strip-shaped structure, including a first positioning portion 171 and a second positioning portion 172. The second positioning portion 172 is provided with a second chamfer 172a at the end thereof, so as to facilitate insertion of the base 400. The first positioning portion 171 and the second positioning portion 172 are connected on the same straight line. The first positioning portion 171 is wider than the second positioning portion 172. A first barb 171a is provided on one side end face of the first positioning portion 171. Preferably, the first barb 171a is provided on the side end face away from the second bending portion 150. The first positioning portion 171 is connected to the side end face of the third connecting portion 160 away from the second connecting portion 140. The positioning portion 170 has the functions of plugging and positioning. Compared with the prior art, there is only one positioning portion for positioning, and two positioning portions are omitted, which reduces the material consumption and reduces the cost.

[0052] like Figure 1 , Figure 2 , Figure 3 , Fig.15 As shown, a testing device compatible with various sizes of QFN packages includes a spring clip group, wherein the spring clip group includes a plurality of first spring clips 100 in the first embodiment, a plurality of second spring clips 200 in the second embodiment, and a plurality of third spring clips 300 in the third embodiment.

[0053] like Figure 4 , Figure 5 , Figure 6 , Figure 7 , Fig. 9 As shown, as a further solution of the utility model: it includes a base 400, a floating needle plate 500 and a grounding probe 600, the floating needle plate 500 includes a needle plate 510 and a fixing bar 520, the needle plate 510 is a rectangular plate structure, preferably a rectangular plate structure, and a first through hole 515 for mounting the grounding probe 600 is arranged in the center, and a plurality of second through holes 516 arranged in 10 squares are arranged around the first through hole 515, 5 second through holes 516 are arranged on each side of the innermost circle, 6 second through holes 516 are arranged on each side of the outer circle, and then 8, 10, 12, 14, 16, 18, 20, and 22 second through holes 516 are arranged in each circle toward the outer layer, and a plurality of third through holes 420 are arranged on the base 400, and the third through holes 420 are used to position the second positioning portion 172. The arrangement of the third through holes 420 satisfies the requirement that the first chamfer 11a of the contact member 110 can be inserted into all the second through holes 516 using only the first spring piece 100 described in the first embodiment, the second spring piece 200 described in the second embodiment, and the third spring piece 300 described in the third embodiment.

[0054] The second through holes 516 are preferably rectangular through holes, and a first through hole area 511, a second through hole area 512, a third through hole area 513, and a fourth through hole area 514 are formed on the needle plate 510; the first through hole area 511 and the third through hole area 513 are formed in the length direction of the needle plate 510, and the length direction of the second through holes 516 in the first through hole area 511 and the third through hole area 513 is consistent with the length direction of the needle plate 510, and 22 second through holes 516 are arranged in the outermost layer, and 4 second through holes 516 are arranged in the innermost layer. The through holes 516 are arranged in an isosceles trapezoid; a second through hole zone 512 and a fourth through hole zone 514 are formed in the width direction of the needle plate 510, and the length direction of the second through holes 516 in the second through hole zone 512 and the fourth through hole zone 514 is consistent with the width direction of the needle plate 510, 22 second through holes 516 are arranged in the outermost layer, and 6 second through holes 516 are arranged in the second innermost layer, and the second through holes 516 from the outermost layer to the second innermost layer are arranged in an isosceles trapezoid, and 6 second through holes 516 are arranged in the innermost layer.

[0055] like Fig. 9 As shown, the base 400 has a fourth through hole 430 at the center for mounting the grounding probe 600. The base 400 includes a base bottom plate portion 410 below, and a plurality of third through holes 420 are arranged on the base bottom plate portion 410. The third through holes 420 are rectangular, preferably rectangular. The plurality of third through holes 420 are divided into a fifth through hole area 411, a sixth through hole area 412, a seventh through hole area 413, and an eighth through hole area 414. The positions of the third through holes 420 in the fifth through hole area 411 and the third through holes 420 in the seventh through hole area 413 are arranged symmetrically with respect to the center of the fourth through hole 430. The positions of the third through holes 420 in the sixth through hole area 412 and the third through holes 420 in the eighth through hole area 414 are arranged symmetrically with respect to the center of the fourth through hole 430. The upper surface of the base 400 is provided with two sets of first limiting blocks 450 and second limiting blocks 460 arranged in opposite directions, and the first limiting blocks 450 and the second limiting blocks 460 are used to limit the floating needle plate 500 .

[0056] like Fig.10As shown, the fifth through hole zone 411 has a total of 99 third through holes 420, with a total of 22 rows. The numbers 1 to 22 in the figure only express the number of rows; the spacing between the third through holes 420 adjacent to each row is L, as shown in the fourth row. Columns are represented from top to bottom, and the leftmost column is the first reference line. The positions of the 99 third through holes 420 in the fifth through hole zone 411 from top to bottom are represented as follows: first row, one third through hole 420, 1.5L to the right of the first reference line; second row, two third through holes 420, from left to right, 0L and 2L to the right of the first reference line, respectively; third row, three third through holes 420, from left to right, 0.5L, 3L, and 4L to the right of the first reference line, respectively; fourth row, four third through holes 420, from left to right, 1.5L, 2.5L, 3.5L, and 4.5L to the right of the first reference line, respectively; fifth row, four The third through holes 420 in the sixth row are 0L, 1L, 2L, and 3L to the right from the first reference line respectively; the fifth row, five third through holes 420, are 0.5L, 1.5L, 3L, 4L, and 5L to the right from the first reference line respectively; the seventh row, four third through holes 420, are 1.5L, 2.5L, 3.5L, and 4.5L to the right from the first reference line respectively; the eighth row, six third through holes 420, are 0L, 1L, 2L, 3L, 5.5L, and 6.5L to the right from the first reference line respectively; the ninth row, seven third through holes 420, are 0.5L, 1.5L, 3L, 4L, and 5L to the right from the first reference line respectively; The first reference line is 0.5L, 1.5L, 3L, 4L, 5L, 6L, and 7L to the right respectively; the tenth row, the five third through holes 420, from left to right, are 1.5L, 2.5L, 3.5L, 4.5L, and 5.5L to the right respectively from the first reference line; the eleventh row, the eight third through holes 420, from left to right, are 0L, 1L, 2L, 3L, 4L, 5.5L, 6.5L, and 7.5L to the right respectively from the first reference line; the twelfth row, the seven third through holes 420, from left to right, are 0.5L, 1.5L, 3L, 4L, 5L, 6L, and 7L to the right respectively from the first reference line; the thirteenth row, the five third through holes 420, from left to right, are 0.5L, 1.5L, 3L, 4L, 5L, 6L, and 7L to the right respectively from the first reference line; The third through holes 420 are 1.5L, 2.5L, 3.5L, 4.5L, and 5.5L to the right from the first reference line from left to right; the fourteenth row, eight third through holes 420, are 0L, 1L, 2L, 3L, 4L, 5.5L, 6.5L, and 7.5L to the right from the first reference line from left to right; the fifteenth row, six third through holes 420, are 0.5L, 1.5L, 3L, 4L, 5L, and 6L to the right from the first reference line from left to right; the sixteenth row, four third through holes 420, are 1.5L, 2.5L, 3.5L, 4.5L, and 5.5L to the right from the first reference line from left to right.5L; the seventeenth row, five of the third through holes 420, from left to right, the distances from the first reference line are respectively 0L, 1L, 2L, 3L, 5.5L to the right; the eighteenth row, five of the third through holes 420, from left to right, the distances from the first reference line are respectively 0.5L, 1.5L, 3L, 4L, 5L to the right; the nineteenth row, four of the third through holes 420, from left to right, the distances from the first reference line are respectively 1.5L, 2.5L, 3.5L, 4.5L to the right; the twentieth row, three of the third through holes 420, from left to right, the distances from the first reference line are respectively 0L, 1L, 2L to the right; the twenty-first row, two of the third through holes 420, from left to right, the distances from the first reference line are respectively 0.5L and 3L to the right; the twenty-second row, one of the third through holes 420, 1.5L to the right of the first reference line. .

[0057] like Fig.11As shown, the sixth through hole zone 412 has a total of 98 third through holes 420, with a total of 22 columns. The numbers 1 to 22 in the figure only express the number of columns; the spacing between the third through holes 420 adjacent to each column is L, as shown in the twentieth column. From left to right, the rows are represented, and the bottom row is the second reference line. The positions of the 98 third through holes 420 in the sixth through hole zone 412 from left to right are represented as follows: in the first column, there is one third through hole 420, 1.5L upward from the second reference line; in the second column, there are two third through holes 420, and from bottom to top, the distances from the second reference line are 0L and 2L upward, respectively; in the third column, there are three third through holes 420, and from bottom to top, the distances from the second reference line are 0.5L, 3L, and 4L upward, respectively; in the fourth column, there are four third through holes 420, and from bottom to top, the distances from the second reference line are 1.5L, 2.5L, 3.5L, and 4.5L upward, respectively; in the fifth column, there are three third through holes 420, and from bottom to top, the distances from the second reference line are 0.5L, 3L, and 4L upward, respectively. , the four third through holes 420 are respectively 0L, 1L, 2L, and 3L upward from the second reference line from bottom to top; the sixth column, the five third through holes 420, are respectively 0.5L, 1.5L, 3L, 4L, and 5L upward from the second reference line from bottom to top; the seventh column, the four third through holes 420, are respectively 1.5L, 2.5L, 3.5L, and 4.5L upward from the second reference line from bottom to top; the eighth column, the six third through holes 420, are respectively 0L, 1L, 2L, 3L, 5.5L, and 6.5L upward from the second reference line from bottom to top; the ninth column, the seven third through holes 420, from bottom to top The distances from the second reference line are 0.5L, 1.5L, 3L, 4L, 5L, 6L, and 7L upwards, respectively; the tenth column, the five third through holes 420, from bottom to top, the distances from the second reference line are 1.5L, 2.5L, 3.5L, 4.5L, and 5.5L upwards, respectively; the eleventh column, the eight third through holes 420, from bottom to top, the distances from the second reference line are 0L, 1L, 2L, 3L, 4L, 5.5L, 6.5L, and 7.5L upwards, respectively; the twelfth column, the seven third through holes 420, from bottom to top, the distances from the second reference line are 0.5L, 1.5L, 3L, 4L, 5L, 6L, and 7L upwards, respectively; the thirteenth column, In the first column, the five third through holes 420 are 1.5L, 2.5L, 3.5L, 4.5L, and 5.5L away from the second reference line from bottom to top; in the fourth column, the seven third through holes 420 are 0L, 1L, 2L, 3L, 4L, 5.5L, and 6.5L away from the second reference line from bottom to top; in the fifth column, the six third through holes 420 are 0.5L, 1.5L, 3L, 4L, 5L, and 6L away from the second reference line from bottom to top; in the sixth column, the four third through holes 420 are 1.5L, 2.5L, 3.5L, 4.5L, and 6.5L away from the second reference line from bottom to top;5L; the seventeenth column, five of the third through holes 420, from bottom to top, the distances from the second reference line are 0L, 1L, 2L, 3L, 5.5L respectively; the eighteenth column, five of the third through holes 420, from bottom to top, the distances from the second reference line are 0.5L, 1.5L, 3L, 4L, 5L respectively; the nineteenth column, four of the third through holes 420, from bottom to top, the distances from the second reference line are 1.5L, 2.5L, 3.5L, 4.5L respectively; the twentieth column, three of the third through holes 420, from bottom to top, the distances from the second reference line are 0L, 1L, 2L respectively; the twenty-first column, two of the third through holes 420, from bottom to top, the distances from the second reference line are 0.5L, 3L respectively; the twenty-second column, one of the third through holes 420, the distance from the second reference line is 1.5L upward. .

[0058] The spacing L on the base bottom plate 410 is equal to the spacing L on the needle plate 510. During assembly, the fifth through hole area 411 is assembled correspondingly to the fourth through hole area 514 or the second through hole area 512.

[0059] like Fig.12 , Fig.13 As shown, as a further solution of the utility model: it also includes a chip limiting frame 700, the chip limiting frame 700 is arranged on the floating needle plate 500, the chip limiting frame 700 is a rectangular plate structure, a square through hole 710 is arranged in the middle, a square limiting frame 720 is arranged around the through hole in one plane, and the square limiting frame 720 is provided with slopes 72a on four sides toward the center of the square.

[0060] The square limiting frame 720 is provided for placing the chip to be tested. The square through hole 710 and the square limiting frame 720 have various specifications to meet the requirements of matching different chip sizes.

[0061] like Fig.14 As shown, as a further solution of the present invention: two lever-type pressing plates 810 for pressing the chip are arranged on the base 400 .

[0062] A through hole is longitudinally arranged on the first limit block 450 for installing a rotating shaft 820 matching the pressure plate 810. The first limit block 450 can also be used to limit the chip limit frame 700. The pressure plate 810 is axially rotatably connected to the rotating shaft 820, wherein the portion close to the chip limit frame 700 is heavier than the portion away from the chip limit frame 700, so that the pressure plate 810 always keeps pressing the chip and the chip limit frame 700.

[0063] The pressing plate 810 is used to press the chip to be tested so as to position the chip more accurately and firmly.

[0064] like Figure 8 , Fig.15 , Fig.16 As shown, as a further solution of the utility model: it also includes an upper cover 910 and a spring 920, the four corners of the upper cover 910 are respectively provided with a first column 911, the first column 911 is arranged toward the base 400, the four sides of the upper cover 910 are provided with limit strips 912, the inner side of the end of the limit strip 912 is provided with a second barb 912a, the limit strip 912 is arranged toward the base 400, the four corners of the base 400 are provided with blind holes 440 matching the first column 911, the spring 920 is placed in the blind hole 440 and sleeved on the outside of the first column 911, the base 400 is provided with a first groove 470 corresponding to the limit strip 912, and a hook portion 480 corresponding to the second barb 912a is also provided at the end of the first groove 470.

[0065] When in use, the chip to be tested is moved to the top of the test device compatible with various sizes of QFN packages, the upper cover 910 is pressed to cause the pressure plate 810 to rotate and open, the chip to be tested is placed in the square limit frame 720, the chip to be tested slides along the slope 72a to the tested position, the upper cover 910 is released to cause the pressure plate 810 to press the chip to be tested, and then the chip is tested.

[0066] like Fig.14 , Fig.15 , Fig.16 As shown, as a further solution of the utility model: the end surfaces of both sides of the pressing plate 810 are provided with second grooves 81a, and the upper cover 910 is provided with four second columns 913, and the second columns 913 are installed in the second grooves 81a.

[0067] The second groove 81a and the second column 913 are provided to facilitate the upper cover 910 to move up and down more stably.

[0068] First embodiment

[0069] like Figure 1 As shown, as a further solution of the present invention: the positioning portion 170 is connected to the third connecting portion 160 at a first positioning point 180 at one end of the third connecting portion 160 close to the second bending portion 150 to form a first elastic piece 100 .

[0070] Second embodiment

[0071] like Figure 2As shown, as a further solution of the present invention: the positioning portion 170 is connected to the third connecting portion 160 at a second positioning point 280 in the middle of the third connecting portion 160 to form a second elastic piece 200 .

[0072] Third embodiment

[0073] like Figure 3 As shown, as a further solution of the present invention: the positioning portion 170 is connected to the third connecting portion 160 at a third positioning point 380 at one end of the third connecting portion 160 away from the second bending portion 150 to form a third elastic piece 300 .

[0074] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A shrapnel, characterized in that: It includes a contact portion, a first connecting portion, a first bending portion, a second connecting portion, a second bending portion, a third connecting portion and a positioning portion; The contact portion and the first connecting portion are both strip-shaped structures, and one end of the contact portion is connected to one end of the first connecting portion; An end of the first connecting portion away from the contact portion is connected to an end portion of the first bending portion; The first bending portion is fan-shaped and is bent in a direction away from the other end of the contact portion, and the other end of the first bending portion is connected to one end of the second connecting portion; The second connecting portion is in a strip shape, and the other end thereof extends toward the connection point between the contact portion and the first connecting portion and is connected to the second bending portion; The second bending portion is fan-shaped and bends in a direction away from the connection point between the contact portion and the first connecting portion. The other end of the second bending portion is connected to one end of the third connecting portion. The third connecting portion is strip-shaped. The positioning portion is a strip-shaped structure, including a first positioning portion and a second positioning portion. The first positioning portion is connected to the second positioning portion on the same straight line. A first barb is provided on one side end face of the first positioning portion. The end of the first positioning portion is connected to the side end face of the third connecting portion away from the second connecting portion.

2. The shrapnel according to claim 1, characterized in that: The positioning portion is connected to the third connecting portion at one end of the third connecting portion close to the second bending portion.

3. The shrapnel according to claim 1, characterized in that: The positioning portion is connected to the third connecting portion at a center position of the third connecting portion.

4. The shrapnel according to claim 1, characterized in that: The positioning portion is connected to the third connecting portion at an end of the third connecting portion away from the second bending portion.

5. A test device compatible with various sizes of QFN packages, characterized in that: It comprises a shrapnel group, wherein the shrapnel group comprises a plurality of shrapnel as described in any one of claims 2-4.

6. The test device compatible with various sizes of QFN packages according to claim 5, characterized in that: It includes a base, a floating needle plate and a grounding probe. The floating needle plate includes a needle plate and a fixing strip. The needle plate is a rectangular plate-shaped structure. A first through hole for installing the grounding probe is arranged in the center. A plurality of second through holes arranged in 10 squares are arranged around the first through hole. The innermost circle has 5 second through holes on each side, the outer circle has 6 second through holes on each side, and the outer layer has 8, 10, 12, 14, 16, 18, 20, and 22 second through holes per circle in sequence. A plurality of third through holes are arranged on the base, and the third through holes are used to position the second positioning part.

7. The testing device compatible with various sizes of QFN packages according to claim 6, characterized in that: It also includes a chip limiting frame, which is arranged on the floating needle plate. The chip limiting frame is a rectangular plate structure with a square through hole in the middle, wherein a square limiting frame is arranged around the through hole in one plane, and the square limiting frame has slopes on four sides toward the center of the square.

8. The test device compatible with various sizes of QFN packages according to claim 6 or 7, characterized in that: The base is provided with two lever-type pressing plates for pressing the chip.

9. The test device compatible with various sizes of QFN packages according to claim 8, characterized in that: It also includes an upper cover and a spring, wherein the four corners of the upper cover are respectively provided with a first column, the first column is arranged toward the base, the four sides of the upper cover are provided with limit strips, the inner side of the end of the limit strip is provided with a barb, the limit strip is arranged toward the base, the four corners of the base are provided with blind holes matching the first column, the spring is placed in the blind hole and sleeved on the outside of the first column, and the base is provided with a first groove corresponding to the limit strip.

10. The testing device compatible with various sizes of QFN packages according to claim 9, characterized in that: Second grooves are arranged on both side end surfaces of the pressing plate, and four second columns are arranged on the upper cover, and the second columns are installed in the second grooves.

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