CN2757135Y - Detector for circuit board - Google Patents
Detector for circuit board Download PDFInfo
- Publication number
- CN2757135Y CN2757135Y CN 200420117500 CN200420117500U CN2757135Y CN 2757135 Y CN2757135 Y CN 2757135Y CN 200420117500 CN200420117500 CN 200420117500 CN 200420117500 U CN200420117500 U CN 200420117500U CN 2757135 Y CN2757135 Y CN 2757135Y
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- circuit board
- measurement jig
- montant
- movable
- ditch
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Abstract
The utility model provides a detector for circuit boards, which is used for detecting a circuit board; the detector comprises a frame-shaped body, two movable transverse rods and a plurality of movable vertical rods, wherein a first side edge and a third side edge of the frame-shaped body are both parallel to an x-shaft direction, and a second side edge and a fourth side edge of the frame-shaped body are both parallel to a y-shaft direction. The first side edge and the third side edge are respectively provided with a slide hook; the long shafts of the movable transverse rods are axially parallel to the y-shaft direction and can be arranged on the two slide hooks of the frame-shaped body in a sliding way; a transverse hook is arranged on the rod body of each movable transverse rod. The movable vertical rods can be movably arranged in the transverse hook of each movable transverse rod to position the circuit board to be detected. The utility model can adjust the lengths of the x-shaft horizontal direction, the y-shaft horizontal direction and a z-shaft vertical direction in a loadbearing region to place and to fix the circuit boards to be detected with different sizes.
Description
[technical field]
The utility model relates to a kind of measurement jig, particularly relates to a kind of measurement jig that is provided with the circuit board of a plurality of electronic components.
[background technology]
Circuit board is a kind of electronic component with various difference in functionalitys in conjunction with to produce the motherboard of specific function, and common circuit board comprises motherboard, adlib, display card ... Deng.The foregoing circuit board finished product is to pass through circuit design, circuit layout, test phase in regular turn, preestablishes target (for example: reach preset function) when test phase reaches, and begins to make with the above-mentioned common motherboard of output.Wherein, at circuit design stage and test phase, circuit designers or Test Engineer all must utilize a kind of measurement jig of fixing circuit board to be tested, so that carry out test job.
As shown in Figure 1, be one first existing measurement jig 1, be to be provided with for a circuit board 2 that is provided with a plurality of electronic components, this measurement jig 1 comprises a frame body 11, and a plurality of positioning components 12 that are spaced apart and arranged on this frame body 11.This frame body 11 is the rectangle framework, comprises one around defining the frame portion 112 of a bearing area 111, and a placing part 113 that protrudes out towards the center level from the medial surface of this frame portion 112.This bearing area 111 is suitable with the area of this circuit board 2.This positioning component 12 comprises that one can make upper and lower mobile bolt 121 for turn.During use, earlier this circuit board 2 is placed on the placing part 113 of this frame body 11, the bolt 121 of adjusting these positioning components 12 again moves down, make the flat portion in the end of these bolts 121 be pressed against the surface of this circuit board 2, this moment is by the downward strength that compresses of these bolts 121, and this circuit board 2 is fixed on this frame body 11 really.
But, when reality is used, the above-mentioned first existing measurement jig 1 can only be applicable to the circuit board 2 of single specification, for a new circuit board (figure do not show), its shape specification determined preceding usually will be through test many times, if the number of times of test too much and constantly change the specification of circuit board, the measurement jig 1 of shaped as frame certainly will will change, it not only wastes the material and the man-hour of the making of measurement jig 1, has more wasted design cost, and is quite impracticable.
In addition, shown in Fig. 2,3,4, being that the TaiWan, China patent announcement is numbered " bilateral adjustable circuit board shaped as frame tool " No. 592430, is the circuit board 3 that is used to carry various different sizes, and this shaped as frame tool 4 comprises a main frame 41, one first active border 42 and one second active border 43.
This main frame 41 is the rectangle framework, comprises a first side 411, a second side 412, one the 3rd side 413, a four side 414, and at the medial surface of these sides 411,412,413,414 towards the horizontally extending placing part 415 of middle position.This first side 411 and the 3rd side 413 are parallel to each other, and this second side 412 and four side 414 are parallel to each other, and above-mentioned side 411,412,413,414 all is provided with a slide rail 416.
This first active border 42, its two end opposite be respectively with the slide rail 416 of this first side 411, form with the slide rail 416 of the 3rd side 413 and to be slidingly matched, move horizontally and form an x direction of principal axis I.Shown in Fig. 2,3, this first active border 42 comprises that the dual side-edge bolt 421, two that lays respectively at two end opposite is arranged on the bottom of this side bolt 421 and the roller bearing 422 in this slide rail 416 slidably, and two adjustment parts 423 that can be arranged on the body of this first active border 42 with moving horizontally.This adjustment part 423 has placing part 4231, two on the body that is connected across this first active border 42 can make this placing part 4231 be fixed on the set bolt 4232 of this first active border 42, and a bolt 4233 that can compress the surface of this circuit board 3.After first active border 42 is moved to suitable position, can utilize this side bolt part 421 to be fixed on the side of this main frame 41.
Shown in Fig. 2,3,4, this second active border 43, its two end opposite be respectively with the slide rail 416 of this second side 412, form with the slide rail 416 of this four side 414 and to be slidingly matched, move horizontally and form a y direction of principal axis II.This second active border 43 duplicates in the structural design of this first active border 42, thus repeat no more, and similar elements is to represent with identical numbering.
By this first active border 42 and this second active border 43, and the formed bearing area 44 of two adjacent sides of this main frame 41 (second side 412 as shown in Figure 2 and the 3rd side 413), and can carry this circuit board 3.During use, can adjust this first active border 42 and this second active border 43 according to the size of this circuit board 3, make bearing area 44 suitable with the size of this circuit board 3, and then the edge of this circuit board 3 is placed on this placing part 415,4231, the last bolt 4233 that utilizes these adjustment parts 423 again makes this circuit board 3 be fixed on the bearing area 44 of this shaped as frame tool 4.
Though the above-mentioned second existing shaped as frame tool 4 can be adjusted this bearing area 44 by moving of first active border 42 and second active border 43, to improve the shortcoming that to adjust bearing area 111 of the first existing measurement jig 1 as shown in Figure 1, but this second existing shaped as frame tool 4 still has following disappearance on using to be solved:
1. this first movable edge 42 and the second movable edge 43 can move horizontally at an x direction of principal axis I and a y direction of principal axis II respectively, and the adjustment of formation two-dimensional space, but, this second existing shaped as frame tool 4 also can't be adjusted z axle vertical direction to form three-dimensional adjustment, cause this circuit board 3 can only be fixed on by 43 of this first movable edge 42 and this second movable edges around bearing area 44 in, and can't make this circuit board 3 be arranged on the top position of this bearing area 44 in response to testing requirement, have the not good shortcoming of practicality relatively.
2. this second existing shaped as frame tool 4 is when using, be to adjust this first active border 42 and this second active border 43 earlier, after making this bearing area 44 and this circuit board 3 quite, adjust the position of these adjustment parts 423 more in regular turn and utilize these set bolts 4232 to fix these adjustment parts 423, then, this circuit board 3 is put placing part 415 in this bearing area 44, on 4231, utilize these bolts 4233 to fix this circuit board 3 at last, this circuit board 3 is stable on this shaped as frame tool 4, complicated operation steps like this is not only time-consuming, and by a placing part 4231, two set bolts 4232 and location each adjustment part 423 of being formed of bolt 4233 have also that to form member various and improve the shortcoming of whole manufacturing cost.
[utility model content]
Therefore, the purpose of this utility model, provide a kind of measurement jig of circuit board, can adjust the length of x axle horizontal direction, y axle horizontal direction and the z axle vertical direction of a bearing area, circuit board to be tested for different sizes is put fixing, and its operation is simple and easy, and it is less and can reduce manufacturing cost to form member.
So, the measurement jig of a kind of circuit board of the present utility model, in order to test a circuit board that includes a plurality of electronic components, this measurement jig comprises a frame body, two movable cross bars and a plurality of movable montant, it is characterized in that:
This frame body, comprise the first side, a second side, one the 3rd side and the four side that connect in regular turn, this first side and the 3rd side all are parallel to an x direction of principal axis, this second side all is parallel to the axial y direction of principal axis of vertical this x with this four side, and this first side and the 3rd side are respectively equipped with a sliding ditch;
This two movable cross bar, its major axis is to being parallel to the y direction of principal axis, and two end opposite of each movable cross bar are the two sliding ditches that are slidably disposed on this frame body for two sliding parts respectively, and the shaft of each movable cross bar offers a horizontal ditch; And
Described movable montant is location circuit board to be tested and the horizontal ditch that is arranged on each movable cross bar movably.
The measurement jig of described circuit board is characterized in that:
The transverse section of this first side and the 3rd side is to be the L font.
The measurement jig of described circuit board is characterized in that:
More comprise and a plurality ofly pass the sliding ditch of this frame body and be linked to the keeper of the sliding part of this activity cross bar.
The measurement jig of described circuit board is characterized in that:
More comprise and a plurality ofly pass the horizontal ditch of this activity cross bar and link the keeper of an end connecting portion of this activity montant.
The measurement jig of described circuit board is characterized in that:
The top of each movable montant is made as one and passes this circuit board, and cooperates a plurality of gim pegs to fix the top connecting portion of this circuit board.
The measurement jig of described circuit board is characterized in that:
The top of each movable montant is the bottom that correspondence is connected to another movable montant.
The measurement jig of described circuit board is characterized in that:
The top of each movable montant is a screw rod, and its bottom is provided with a screw.
The measurement jig of described circuit board is characterized in that:
The major axis of this activity montant is to being parallel to a z direction of principal axis, and this z direction of principal axis is respectively perpendicular to this x direction of principal axis and y direction of principal axis.
The measurement jig of described circuit board is characterized in that:
This activity montant more offers a vertical ditch, and one is arranged on this vertical ditch movably to carry the support member of this circuit board.
The measurement jig of described circuit board is characterized in that:
The support member of this activity montant comprises that one is arranged on the linking part of this vertical ditch movably, reaches one from the support portion that this linking part extended to form and supplied to carry this circuit board, and this linking part is fixed on this activity montant with the corresponding winding of a gim peg.
The measurement jig of described circuit board is characterized in that:
The support member of this activity montant comprises that one is arranged on the linking part of this vertical ditch movably, and reaching one can be with respect to the support portion of this linking part pivot, and this linking part is fixed on this activity montant with the corresponding winding of a gim peg.
The measurement jig of circuit board of the present utility model, can adjust the length of x axle horizontal direction, y axle horizontal direction and the z axle vertical direction of a bearing area, put fixingly for the circuit boards to be tested of different sizes, and its operation is simple and easy, and the composition member is less and can reduce manufacturing cost.
[description of drawings]
Be elaborated below by most preferred embodiment and accompanying drawing measurement jig to the utility model circuit board, in the accompanying drawing:
Fig. 1 is the use synoptic diagram of one first existing measurement jig.
Fig. 2 is a stereo appearance figure of No. the 592430th, TaiWan, China patent " bilateral adjustable circuit board shaped as frame tool ".
Fig. 3 is the sectional perspective enlarged drawing of Fig. 2.
Fig. 4 is that synoptic diagram is used in one of No. the 592430th, TaiWan, China patent " bilateral adjustable circuit board shaped as frame tool ".
Fig. 5 is the stereo appearance figure of first preferred embodiment of the measurement jig of circuit board of the present utility model, illustrates that this measurement jig comprises a frame body, four movable cross bars, a plurality of movable montant and a plurality of keepers.
Fig. 6 is the cut-open view of 6-6 along the line among Fig. 5, illustrate this frame body sliding ditch the position is set.
Fig. 7 is the cut-open view of similar Fig. 6, illustrate this frame body sliding ditch the position is set.
Fig. 8 is that synoptic diagram is used in one of this first preferred embodiment.
Fig. 9 is that synoptic diagram is used in one of this first preferred embodiment, illustrates that this four movable montant is spirally connected a movable montant respectively again to carry out the axial height control of z.
Figure 10 is the stereo appearance figure of second preferred embodiment of the measurement jig of circuit board of the present utility model.
Figure 11 is the stereo appearance figure of the 3rd preferred embodiment of the measurement jig of circuit board of the present utility model.
Figure 12 is that synoptic diagram is used in one of the 3rd preferred embodiment.
[embodiment]
Before proposing detailed description, be noted that in the following description similar elements is to represent with same numeral.
Shown in Fig. 5,8, be first preferred embodiment of the measurement jig of circuit board of the present utility model, in order to test a circuit board 5, this circuit board 5 includes a plurality of electronic components, and a plurality of perforation 51 that are located in its outer circumferential side.This measurement jig comprises a frame body 6, four movable cross bars 7, a plurality of movable montant 8 and a plurality of keepers 9.
This frame body 6 is to be made by the electrostatic prevention material, comprises the first side 61, a second side 62, one the 3rd side 63 and the four side 64 that connect in regular turn.This first side 61 all is parallel to an x direction of principal axis I with the 3rd side 63.This second side 62 all is parallel to a y direction of principal axis II with this four side 64, and this x direction of principal axis I is perpendicular to this y direction of principal axis II.This first side 61 is to be the L font with the transverse section of the 3rd side 63.And the inboard of this first side 61 and the 3rd side 63 is respectively equipped with a sliding ditch that is parallel to this x direction of principal axis I, and it can be the position that is provided with of as shown in Figure 6 sliding ditch 65, or sliding ditch 65 ' as shown in Figure 7 (following all with sliding ditch 65 shown in Figure 6 as an illustration).
This activity cross bar 7 is to be made by the electrostatic prevention material, and its length is slightly less than distance between this first side 61 and the 3rd side 63, makes this activity cross bar 7 be parallel to y direction of principal axis II and can move in this frame body 6 relative to x direction of principal axis I ground.And comprise two sliding parts 71 of two end opposite that are positioned at this activity cross bar 7, and between this two sliding part 71, and offer a horizontal ditch 72 that is parallel to y direction of principal axis II from its shaft.This two sliding part 71 can be slidingly arranged in respectively on the two sliding ditches 65 of this frame body 6.This sliding part 71 has a pilot hole 711.
The diameter of this activity montant 8 is greater than the horizontal ditch 72 of this activity cross bar 7, and it is mobile on this horizontal ditch 72 to be parallel to a z direction of principal axis III ground, and this z direction of principal axis III is respectively perpendicular to this x direction of principal axis I and y direction of principal axis II.This activity montant 8 comprises an opposite top connecting portion 81 and an end connecting portion 82.As shown in Figure 6, in the present embodiment, this top connecting portion 81 is a screw rod, and should end connecting portion 82 be a screw, make per two upper and lower adjacent movable montants 8 be detachable liftoff up and down winding together, promptly the end connecting portion 82 of Shang Fang movable montant 8 can be screwed onto the top connecting portion 81 of the movable montant 8 of this below.
After these keepers 9 can pass the sliding ditch 65 (or sliding ditch 65 ' as shown in Figure 7) of this frame body 6, lock is tied in the pilot hole 711 of the sliding part 71 of these movable cross bars 7, behind the horizontal ditch 72 that can pass these movable cross bars 7, lock is tied in the end of this activity montant 8 connecting portion 82.In the present embodiment, be provided with an insulating washer 100 between this activity cross bar 7 and this activity montant 8.
Shown in Fig. 5,8, in the present embodiment, left side two adjacent movable cross bars 7 in this frame body 6 are for the aforementioned circuit board to be tested 5 of bearing, and other two adjacent movable cross bars 7 are for bearing one testing circuit board 5 ', and designer and Test Engineer can utilize this testing circuit board 5 ' that this circuit board to be tested 5 is carried out debug, test jobs.Because of debug, test jobs are prior art, so no longer describe in detail at this.Because of the adjacent movable cross bar 7 in this left side two identical with the use-pattern of other two adjacent movable cross bars 7, so following describe at left side two adjacent movable cross bars 7.
By the adjustment of 7 pairs of x direction of principal axis of left side two movable cross bars I of this frame body 6 being done move horizontally, the adjustment that 8 pairs of y direction of principal axis of two movable montants II on each movable cross bar 7 work is moved horizontally again, make this two movable cross bar 7 and these four movable montant 8 one common peripheral around the bearing area 110 that defines, can be for this circuit board to be tested 5 of carrying.When using, can adjust this two movable cross bar 7 and this two movable montant 8 according to the size of this circuit board to be tested 5, make this bearing area 110 suitable with the size of this circuit board 5, and then after perforation 51 correspondences of this circuit board 5 are set in the top connecting portion 81 of this four movable montant 8, utilize number nut 120 to be screwed onto this top connecting portion 81 again, this circuit board 5 is fixed on this frame body 6.
In addition, as shown in Figure 9, the more important thing is, measurement jig of the present utility model can be in response to testing requirement, and this four movable montant 8 is spirally connected at least one movable montant 8 respectively again to carry out the height control of z direction of principal axis III, the movable montant of the different length that also can be spirally connected certainly (figure does not show) is to be adjusted into suitable height.In the present embodiment, circuit board 5 shown in Figure 9 " the bottom be to be provided with Port 52 ", by a movable montant 8 that this four movable montant 8 is spirally connected respectively again, circuit board 5 is connected on this measurement jig smoothly by the support height, it is different from the adjustment that moves horizontally that as shown in Figure 4 the second existing shaped as frame tool 4 can only be made x direction of principal axis I and y direction of principal axis II, measurement jig of the present utility model relatively can be done the adjustment of three directions such as x axle, y axle, z axle, has high value of practical to define suitable bearing area 110.
As Fig. 5, shown in 8, moreover, the utility model is after earlier perforation 51 correspondences of this circuit board 5 being set in the top connecting portion 81 of four movable montants 8 of this bearing area 110, utilize number nut 120 to be screwed onto this top connecting portion 81 again, this circuit board 5 is fixed on this frame body 6, be different from as Fig. 2, need shown in 4 are adjusted the position of each adjustment part 423 earlier, screw two set bolts 4232 of each adjustment part 423 then, then utilize these bolts 4233 to fix the complicated operation steps of these circuit board 3 grades, moreover, the composition member of each adjustment part 423 is numerous and by making the whole situation that member increases of forming, it is less that measurement jig of the present utility model relatively has the simple and easy and whole composition member of operation, reduce the advantage of manufacturing cost.
As shown in figure 10, it is second preferred embodiment of the measurement jig of circuit board of the present utility model, can in this frame body 6, do the adjustment of three directions such as x axle, y axle, z axle equally, its place that is different from first preferred embodiment is: this activity montant 8 ' comprises that one is parallel to vertical ditch 82 ', the end linking part 83 ' that the body of rod 81 ', that moves on a z direction of principal axis III ground is being arranged on this body of rod 81 ' with prolonging this z direction of principal axis III on the horizontal ditch 72 of this activity cross bar 7, and a support member 84 ' that is arranged on movably on this vertical ditch 82 '.This end linking part 83 ' is a screw that can supply aforementioned keeper 9 to be spirally connected.This support member 84 ' can be made height control along z direction of principal axis III, and has a linking part 841 ' that is arranged on this vertical ditch 82 ' movably, and one extends to form and can be for the support portion 842 ' of this circuit board 5 of carrying from this linking part 841 '.This linking part 841 ' can be borrowed a gim peg 130 corresponding windings and be fixed on this activity montant 8 '.
During use, can adjust the horizontal level of this two movable cross bar 7 and this two movable montant 8 ' earlier according to the size of this circuit board to be tested 5, and the height and position of this support member 84 ' of adjustment, make this bearing area 110 be slightly larger than the size of this circuit board 5, then, these circuit board 5 bearings are on the support portion 842 ' of this support member 84 ', last, move this activity montant 8 ' again and make this circuit board 5 that is fixedly clamped, this circuit board 5 is fixed on this frame body 6.
As shown in figure 11, it is the 3rd preferred embodiment of the measurement jig of circuit board of the present utility model, can do the adjustment of three directions such as x axle, y axle, z axle equally in this frame body 6, its place that is different from second preferred embodiment is: this activity montant 8 " support member 84 " support portion 842 " be can be with respect to this connecting portion 841 " make pivotal action.Because of this linking part 841 " with this support portion 842 " pivot structure be prior art, and non-request feature of the present utility model is so repeat no more.
This support portion 84 " can be in response to testing requirement bearer circuit plate (figure does not show) or other test fittings (figure does not show), also can cooperate the use of aforementioned first preferred embodiment certainly as illustrated in fig. 12.As shown in figure 12, this circuit board 5 is the top connecting portion 81 and number nut 120 that utilizes the movable montant 8 of first preferred embodiment as shown in Figure 9 with this testing circuit board (figure does not show), and is fixed on this frame body 6.In addition should activity montant 8 " support portion 842 " carry a display screen 140 that is electrically connected this circuit board to be tested 5 in response to testing requirement, whereby, operation that can convenient tester.
Claims (11)
1. the measurement jig of a circuit board, in order to test a circuit board that includes a plurality of electronic components, this measurement jig comprises a frame body, two movable cross bars and a plurality of movable montant, it is characterized in that:
This frame body, comprise the first side, a second side, one the 3rd side and the four side that connect in regular turn, this first side and the 3rd side all are parallel to an x direction of principal axis, this second side all is parallel to the axial y direction of principal axis of vertical this x with this four side, and this first side and the 3rd side are respectively equipped with a sliding ditch;
This two movable cross bar, its major axis is to being parallel to the y direction of principal axis, and two end opposite of each movable cross bar are the two sliding ditches that are slidably disposed on this frame body for two sliding parts respectively, and the shaft of each movable cross bar offers a horizontal ditch; And
Described movable montant is location circuit board to be tested and the horizontal ditch that is arranged on each movable cross bar movably.
2. the measurement jig of circuit board as claimed in claim 1 is characterized in that:
The transverse section of this first side and the 3rd side is to be the L font.
3. the measurement jig of circuit board as claimed in claim 1 is characterized in that:
More comprise and a plurality ofly pass the sliding ditch of this frame body and be linked to the keeper of the sliding part of this activity cross bar.
4. the measurement jig of circuit board as claimed in claim 1 is characterized in that:
More comprise and a plurality ofly pass the horizontal ditch of this activity cross bar and link the keeper of an end connecting portion of this activity montant.
5. the measurement jig of circuit board as claimed in claim 1 is characterized in that:
The top of each movable montant is made as one and passes this circuit board, and cooperates a plurality of gim pegs to fix the top connecting portion of this circuit board.
6. the measurement jig of circuit board as claimed in claim 1 is characterized in that:
The top of each movable montant is the bottom that correspondence is connected to another movable montant.
7. the measurement jig of circuit board as claimed in claim 1 is characterized in that:
The top of each movable montant is a screw rod, and its bottom is provided with a screw.
8. the measurement jig of circuit board as claimed in claim 1 is characterized in that:
The major axis of this activity montant is to being parallel to a z direction of principal axis, and this z direction of principal axis is respectively perpendicular to this x direction of principal axis and y direction of principal axis.
9. the measurement jig of circuit board as claimed in claim 1 is characterized in that:
This activity montant more offers a vertical ditch, and one is arranged on this vertical ditch movably to carry the support member of this circuit board.
10. the measurement jig of circuit board as claimed in claim 9 is characterized in that:
The support member of this activity montant comprises that one is arranged on the linking part of this vertical ditch movably, reaches one from the support portion that this linking part extended to form and supplied to carry this circuit board, and this linking part is fixed on this activity montant with the corresponding winding of a gim peg.
11. the measurement jig of circuit board as claimed in claim 9 is characterized in that:
The support member of this activity montant comprises that one is arranged on the linking part of this vertical ditch movably, and reaching one can be with respect to the support portion of this linking part pivot, and this linking part is fixed on this activity montant with the corresponding winding of a gim peg.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420117500 CN2757135Y (en) | 2004-12-07 | 2004-12-07 | Detector for circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420117500 CN2757135Y (en) | 2004-12-07 | 2004-12-07 | Detector for circuit board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2757135Y true CN2757135Y (en) | 2006-02-08 |
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ID=35965522
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420117500 Expired - Fee Related CN2757135Y (en) | 2004-12-07 | 2004-12-07 | Detector for circuit board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2757135Y (en) |
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| CN112816857A (en) * | 2021-04-16 | 2021-05-18 | 国开启科量子技术(北京)有限公司 | Circuit board test system and manufacturing method thereof |
-
2004
- 2004-12-07 CN CN 200420117500 patent/CN2757135Y/en not_active Expired - Fee Related
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