CN202238692U - Automatic tester for electrical performance of minitype annular piezoresistor - Google Patents
Automatic tester for electrical performance of minitype annular piezoresistor Download PDFInfo
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- CN202238692U CN202238692U CN2011203791533U CN201120379153U CN202238692U CN 202238692 U CN202238692 U CN 202238692U CN 2011203791533 U CN2011203791533 U CN 2011203791533U CN 201120379153 U CN201120379153 U CN 201120379153U CN 202238692 U CN202238692 U CN 202238692U
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Abstract
The utility model relates to a tester for piezoresistor, in particular to an automatic tester for the electrical performance of a minitype annular piezoresistor, which comprises a feeding mechanism, a testing mechanism, a sorting mechanism and a control circuit. The automatic tester for the electrical performance of the minitype annular piezoresistor is designed for automatically testing and sorting the electrical performance of the minitype annular piezoresistor and is used for replacing manual sorting, so that the occurrence of the phenomenon of man-made sorting by mistake is prevented, and the production efficiency is greatly improved.
Description
Technical field
The utility model relates to a kind of piezo-resistance testing arrangement, specifically, relates to a kind of electrical property automatic testing equipment of micro loop piezo-resistance.
Background technology
Being called as the micro loop piezo-resistance for the ring varistor of size below Φ 3.0mm, is a ring-type thin slice body that has three electrodes, and there are three electrodes in its front.
The micro loop piezo-resistance mainly is to use on mobile phone vibrating motor, and mobile phone market is promoting the micro-vibration motors designs and the manufacturing technology aspect requires motor to take less PCB area, and needs motor to adopt thin design.Also adopted the motor that carries out caller identification ring and games application in the mobile phone; It is to develop to microminiaturization that littler, thinner design requirement has been facilitated the dimensional requirement to the micro loop piezo-resistance always; From φ 3.7mm to φ 3.1mm to φ 3.0mm to φ 2.9mm to φ 2.8mm; With the φ 2.4mm outside dimension of now, micro loop piezo-resistance monolithic weight is at 0.007g-＞0.006-＞0.004g.As electronic component, its electrical property must carry out just being delivered to after 100% test that client uses, manufacturings needs can be accurately, at a high speed, the electrical property ATE device of reliable micro loop piezo-resistance satisfies great demand.
There is not the ready-made equipment that micro loop piezo-resistance electrical property is tested automatically that is used in the market; What its means of testing was main is manual test, and manual test is to use the test pen that three testing needles identical with distribution of electrodes are housed, and aims at three electrode positions of micro loop piezo-resistance and pushes down; And then press Test Switchboard; Then, artificial gear indication, the manual product box that pushes product the relevant position according to the testing, sorting appearance.
The micro loop piezo-resistance is small-sized; In manual test, will look three electrode positions of product and do to dial commentaries on classics, make three electrode alignment testing needles, visual operation is had any problem; Manually press the bad control of dynamics of pressing the micro loop piezo-resistance, be prone to cause the micro loop piezo-resistance damaged.Manual test sorting, testing, sorting result's correctness are guaranteed that by the people reliability is not high, and moving of product moved by hand, and be random big, the little mobile product difficulty of product, and client is very worried to the quality of manual test.
The production efficiency of manual test sorting is low; Cost is high: manual production efficient is at 12～16/minute; By we produce the micro loop piezo-resistance at 1,200 ten thousand/month at present; The manual test personnel need just to deal with delivery more than 50 people, thus be the labour anxious lack with the high condition of labor cost under the huge obstruction of production.
The utility model content
The utility model has overcome shortcoming of the prior art, and a kind of electrical property automatic testing equipment of micro loop piezo-resistance is provided, and testing, sorting speed is fast; Separate unit machine testing, sorting speed is 120～180/minute, and production efficiency is high, saves manpower in a large number; Simple to operate; Sorting is accurate, and working stability is reliable, prevents during testing, sorting that the carelessness of artificial test from arriving client with the defective products shipment.
In order to solve the problems of the technologies described above, the utility model is realized through following technical scheme:
A kind of electrical property automatic testing equipment of micro loop piezo-resistance comprises feed mechanism, mechanism for testing, sorting mechanism and control circuit.
Further, said feed mechanism comprises the dish that shakes, shake dish material loading track and slice turning device, and the said dish that shakes connects the dish material loading track that shakes, and the said dish material loading track that shakes connects a hopper, and said dish material loading track one side of shaking is provided with slice turning device.
Further, the said dish material loading track that shakes is an involute screw rising track.
Further; The said sheet that turns over comprises that device comprises plate-turning action cylinder and at least two reflection from lens formula photoelectric sensors; The distance of two reflection from lens formula inductors is the size of a micro loop piezo-resistance; Said dish material loading track one side of shaking is provided with turns over the sheet Auxiliary Track, and the said sheet Auxiliary Track that turns over connects said hopper.
Further; Said mechanism for testing comprises top rotary table, lower fixed disk, electrode contraposition part and measuring head; Said top rotary table is provided with the containing hole of ccontaining micro loop piezo-resistance, and said electrode contraposition part is located on the contraposition support, and said measuring head is located on the measuring head support; The corresponding said electrode contraposition part of said lower fixed disk, said measuring head are provided with the through hole of diameter less than micro loop piezo-resistance diameter; Said lower fixed disk below is provided with the contraposition fore-set and test fore-set that slides up and down along said through hole, and said contraposition fore-set is located at a fore-set with the test fore-set and is moved up and down on the device, and said contraposition fore-set is provided with contraposition fore-set whirligig.
Further, said measuring head is at least two.
Further, said electrode contraposition part is a reflection from lens formula photoelectric sensor.
Further, said fore-set moves up and down the movement platform that device comprises cam, pulley, connecting rod and is located at said connecting rod top, and said contraposition fore-set is located at the movement platform top with the test fore-set.
Further, said contraposition fore-set whirligig is the contraposition rotary electric machine.
Further, said sorting mechanism comprises the sorting rotating disk, and said sorting rotating disk is provided with some gear cups, and said gear cup is provided with self-closing dodge gate of spring and the cylinder that is used for opening the self-closing dodge gate of spring.
Compared with prior art, the beneficial effect of the utility model is:
The utility model is that special electrical property test automatically, sorting for the micro loop piezo-resistance designs, and replaces hand-sorting, prevents the artificial wrong phenomenon generation that divides, and enhances productivity greatly.
And can be effectively to the discharging of the following size micro loop of Φ 3.0mm piezo-resistance automatic feed test stepping, simple in structure, reduce infrastructure cost and assembling maintenance cost, can imitate and prevent that automatic testing equipment generation test leakage from may well ask topic.
Description of drawings
Below in conjunction with the accompanying drawing and the specific embodiment the utility model is done further detailed explanation.
Fig. 1 is that the master of the utility model looks sketch map;
Fig. 2 is the schematic top plan view of the utility model;
Fig. 3 is that the master of feed mechanism looks sketch map;
Fig. 4 is the schematic top plan view of feed mechanism;
Fig. 5 is the slice turning device sketch map;
Fig. 6 is the hopper sketch map;
Fig. 7 is that the master of mechanism for testing looks sketch map;
Fig. 8 is the schematic top plan view of mechanism for testing;
Fig. 9 is that the fore-set of mechanism for testing moves up and down device and motor contraposition part sketch map;
Figure 10 is that the fore-set of mechanism for testing moves up and down device and measuring head sketch map;
Figure 11 is the measuring head sketch map;
Figure 12 is that the master of sorting mechanism looks sketch map;
Figure 13 is the schematic top plan view of sorting mechanism;
Figure 14 is the power drive sketch map of the utility model;
Figure 15 is the functional block diagram of this practical new middle automatic testing equipment;
Figure 16 is the electric control theory figure of this practical new middle automatic testing equipment.
Among the figure, 1---rack body; 2---dish shakes; 3---dish material loading track shakes; 4---hopper; 5---the vibrating disk hopper; 6---electromagnetic oscillating body; 7---turn over the sheet Auxiliary Track; 8---reflection from lens formula photoelectric sensor; 9---the plate-turning action cylinder; 10---turn over the sheet mounting bracket; 11---top rotary table; 12---containing hole; 13---lower fixed disk; 14---measuring head; 15---power transmission shaft; 16---the contraposition support; 17---the measuring head support; 18---electrode contraposition part; 19---the contraposition fore-set; 20---the test fore-set; 21---through hole; 22---cam; 23---pulley; 24---connecting rod; 25---movement platform; 26---rotary electric machine; 27---the sorting tester; 28---the sorting rotating disk; 29---the gear cup; 30---the self-closing dodge gate of spring; 31---cylinder; 32---the gear feed bin; 33---converying feeding tube; 34---exchange reducing motor; 35---dispenser; 36---control circuit.
The specific embodiment
Like Fig. 1, shown in 2, the electrical property automatic testing equipment of the described micro loop piezo-resistance of the utility model comprises feed mechanism, mechanism for testing, sorting mechanism and control circuit 36.
Consult Fig. 3,4; Feed mechanism is located on the rack body 1, and feed mechanism comprises the dish 2 that shakes, shake dish material loading track 3 and slice turning device, and the dish material loading track 3 that shakes is welded on the dish 2 that shakes; The dish material loading track 3 that shakes connects a hopper 4, and dish material loading track 3 one sides of shaking are provided with slice turning device.
The dish 2 that shakes is selected the broach hopper electric and magnetic oscillation dish of Φ 120mm for use; Its involving vibrations biscuit bucket 5; Individual electromagnetic oscillating body 6 is arranged below the vibrating disk hopper 5, be impulse mgnet, can make vibrating disk hopper 5 make vertical vibration; Drive vibrating disk hopper 5 by the spring leaf that tilts and do around its vertical axis and rock vibration, dish 2 drive controlling of shaking adopt the control of SDVC31 frequency-shift keying vibration feeding controller.
Adopt the stainless steel strip of 2mm thickness on the vibrating disk hopper 5 of taper, to make the dish material loading track 3 that shakes; Be welded into spiral rising track by involute; From 2 ends of dish that shake to track export to hopper 4 2.3 circles that have three layers, at top section the long varied angle orbital segment of 100mm is set, by the change gyration of 0 °-＞75 °-＞0 ° of original orbital plane; Keep the track segment length at 75 ° of inclinations angle that 50mm is arranged; Here set up slice turning device, add on this section track opposite and turn over sheet Auxiliary Track 7, be used for catching the resistor disc that slice turning device pushes away.
Consult Fig. 5, slice turning device is made induced signal by two reflection from lens formula photoelectric sensors 8, because micro loop piezo-resistance size is little; And be annular, the special employing is little luminous point (luminous point of Φ 0.1mm) reflection from lens formula photoelectric sensor 8, so combine with two; The distance of two reflection from lens formula photoelectric sensors 8 is the size of a micro loop piezo-resistance; Two luminous points impinge upon on the ring of micro loop piezo-resistance, and the sensitivity degree of accuracy is very high like this, and ability 99.9% identifies the electrode surface and the non-electrode surface of micro loop piezo-resistance; Plate-turning action cylinder 9 is installed in and turns on the sheet mounting bracket 10; After the identification, handle to 9 instructions of plate-turning action cylinder through PLC, plate-turning action cylinder 9 is overthrown the micro loop piezo-resistance that is not electrode surface on the track on opposite; Become electrode surface upwards, through turning over the sheet Auxiliary Track 7 orderings hopper 4 of going on foot.
The dish material loading track 3 that shakes goes out to shake dish 2 warps one straight section guide rail to hopper 4; The depth design of hopper 4 has the summation of 10-20 sheet micro loop piezo-resistance thickness; Can be deposited in the micro loop piezo-resistance that track is sent here in the hopper 4; Hopper 4 faces the material hole of test top rotary table 11, and the micro loop piezo-resistance is along with the rotation of test top rotary table 11 falls into containing hole 12 separation one by one.
Consult Fig. 6; The handing-over of feeding and mechanism for testing goes out to adopt hopper 4 designs of storage type discharging; Let the micro loop piezo-resistance deliver to hopper 4 through the material loading track, build up a stringly on top rotary table 11, guaranteeing like this has the resistor disc of some above top rotary table 11, to wait for blanking; Play a buffering of feeding speed and test speed, the continuity that guarantees test is with high-speed.
Consult Fig. 7 to Figure 11; Mechanism for testing comprises top rotary table 11, lower fixed disk 13, electrode contraposition part 18 and measuring head 14; Top rotary table 11 connects a power transmission shaft 15, and mechanism for testing is arranged on the rack body 1, and electrode contraposition part 18 is located on the contraposition support 16; Measuring head 14 is located on the measuring head support 17, is used for micro loop piezo-resistance three electrodes are carried out the simultaneously operating of the separation of micro loop piezo-resistance, electrode contraposition and test.
In the present embodiment, electrode contraposition part 18 adopts the reflection from lens optical inductors, utilizes reflection from lens optical inductor and rotary electric machine 26, can adjust micro loop piezo-resistance ground electrode position automatically, make the correspondence position ability accurate of itself and measuring head 14 a pair of on.
The thin dish of top rotary table 11 for rotating; Thickness Design has only 50% of single-sheet miniature ring varistor thickness; Be 0.2～0.3mm; Evenly leave 20 containing holes 12 on top rotary table 11 peripheries, containing hole 12 is of a size of 1.1～1.2 times of micro loop piezo-resistance appearance and size, can entangle the micro loop piezo-resistance well.The micro loop piezo-resistance that 13 support top rotary tables of lower fixed disk, 11 containing holes 12 entangle; Lower fixed disk 13 has through hole 21 on 2 positions of counter electrode contraposition part 18, measuring head 14; Can slide up and down contraposition fore-set 19 and test fore-set 20 are installed in the through hole 21, are used for the micro loop piezo-resistance that the containing hole 12 of jack-up top rotary table 11 entangles.
Contraposition fore-set 19 moves up and down device with test fore-set 20 belows for fore-set; Fore-set moves up and down device and comprises cam 22, pulley 23, connecting rod 24 and the movement platform 25 of being located at connecting rod 24 tops, and contraposition fore-set 19 is located at movement platform 25 tops with test fore-set 20.
Contraposition fore-set 19 connects contraposition rotary electric machine 26; Electrode contraposition part 18 on contraposition fore-set 19 tops, the contraposition support 16 is reflection from lens formula photoelectric sensor, is used for aiming at the position of three electrodes of the micro loop piezo-resistance that the containing hole 12 of jack-up top rotary table 11 entangles.Drive contraposition fore-set 19 through contraposition rotary electric machine 26 and rotate the micro loop piezo-resistance; After putting in place; Reflection from lens formula photoelectric sensor provides signal and stops operating through PLC commander contraposition rotary electric machine 26; Thereby changed the position of three electrodes of micro loop piezo-resistance, for getting ready in next one test post.
Two measuring heads 14 are arranged; Two measuring heads 14 connect sorting tester 27 respectively; The design of the two measuring heads 14 in two-position can be tested two resistance simultaneously, and same resistance carries out the two-stage test of two measuring heads 14; Can imitate and prevent that automatic testing equipment generation test leakage from may well ask topic, and greatly improve testing efficiency.
Measuring head 14 is fixed; Corresponding two test post; The micro loop piezo-resistance jack-up that the containing hole 12 of top rotary table 11 entangles, press to three probes of measuring head 14 through test fore-set 20, let the good back of its contact trigger sorting tester 27 and test.Top rotary table 11 rotates the micro loop piezo-resistance that the containing hole 12 with top rotary table 11 entangles and delivers to electrode contraposition part 18 positions; After the rotation resistor disc makes electrode position and testing needle position consistency; Forwarding first measuring head, 14 positions to top rotary table 11 again tests; The result is after PLC handles, and the qualified element of just having tested with top rotary table 11 continuous turning handles is sent to sorting mechanism; Measuring head 14 positions are measured and are underproofly just turned to second measuring head 14 position with top rotary table 11 and carry out second test, after PLC handles, deliver to the sorting mechanism sorting by the second test result.
Consult Figure 15,16, the course of work of mechanism for testing is:
Top rotary table 11 separates micro loop piezo-resistance a slice a slice; Advanced column electrode contraposition; Be used to adjust the correspondence position of micro loop piezoresistance electrode and measuring head 14, three electrodes of micro loop piezo-resistance are alignd with the correspondence position of three probes of measuring head 14 each other, test again; Test block is designed with the two measuring heads 14 in two-position: be introduced into first measuring head, 14 positions; By the following test fore-set that is provided with 20 jack-up micro loop piezo-resistances, test fore-set 20 makes the closely probe of contact first measuring head 14 of micro loop piezo-resistance, carries out the unit for electrical property parameters test by 14 pairs of micro loop piezo-resistances of this first measuring head.First measuring head, 14 test passes, when this resistor disc forwarded second measuring head 14 to, the sorting tester 27 that does not start second measuring head 14 had been tested again, delivers to sorting mechanism with top rotary table 11.During first measuring head, 14 test failures, when this resistor disc forwards second measuring head 14 to, will start sorting second measuring head 14 and carry out second test again, sorting mechanism is delivered to top rotary table 11 in the back.
Figure 12 to Figure 13, sorting mechanism comprise sorting rotating disk 28, and sorting rotating disk 28 is provided with some gear cups 29, and gear cup 29 is provided with self-closing dodge gate 30 of spring and the cylinder 31 that is used for opening the self-closing dodge gate 30 of spring.
Sorting rotating disk 28 is as separating the location; Be the aluminium alloy rotating disk, 20 the gear cups 29 that evenly distribute on the sorting rotating disk 28, gear cup 29 adopts stainless steel tube processing; Beneath by 60 degree angles making; Angle is equipped with the self-closing dodge gate 30 of spring, and 18 grades of qualified shelves at most can sorting gear feed bin 32 be arranged, 1 grade of fixing defective shelves.
Corresponding distribution gear cup 29 position circular arcs are arranged with n cylinder 31 (quantity is adorned 19 cylinders at most and moved by producing needs) on opposite, aluminium alloy rotating disk edge, and the self-closing dodge gate 30 of spring that is used for opening gear cup 29 makes resistor disc fall into following gear feed bin 32.When the resistance of these gear cup 29 positions on the sorting rotating disk 28 arrives this gear; The cylinder 31 of sorting rotating disk 28 these positions moves, and opens the self-closing dodge gate 30 of spring of this gear cup 29, makes resistor disc this gear feed bin 32 below converying feeding tube 33 falls into; Accomplish sorting; Fixing defective shelves are located at the rearmost position, and its actuating cylinder 31 extended immobilization opening actions do not have resistor disc to be detained to cause when guaranteeing the 29 circulation sortings of sorting rotating disk 28 gear cups and Lou select mistake.
Sorting rotating disk 28 rotates through in-line gears and test rotating disk synchronously.
It is the control circuit 36 of its processing core that the utility model adopts PLC.
Control circuit 36 mainly is made up of Switching Power Supply, PLC, magnetic valve, photoelectric sensor, magnetic valve and SDVC31 frequency-shift keying vibration feeding controller, US590-02 electron speed regulator, and wherein SDVC31 frequency-shift keying vibration feeding controller, US590-02 electron speed regulator are market finished product products.
Consult Figure 14; Top rotary table 11 directly exchanges dispenser 35 drivings that reducing motor 34 drives by the 5GU15K of US590-02 electron speed regulator control, and the contraposition fore-set 19 and the test fore-set 20 that drive electrode contraposition part 18, first measuring head, 14 positions, second measuring head 14 position with the cam 22 of dispenser 35 consistent rotating speeds are done synchronous operation.The power unification exchanges reducing motor 34 outputs by 5GU15K, and driven in synchronism dispenser 35 and cam 22, dispenser 35 drive test rotating disk and 28 runnings of sorting rotating disk, the action of cam 22 control electrode contrapositions, test.By bindiny mechanism's running action of pure machinery, can not exist action difference slow like this, favourable for high speed test.
The machining center apparatus processing is adopted in all-metal test rotating disk design, and quality of fit is high, can satisfy the little lightweight characteristic of size of micro loop piezo-resistance, and resistor disc can not break away from displacement in running up.Test top rotary table 11 cards and chip contact portion are by the stainless steel manufacturing.
The course of work of the utility model is:
At first the micro loop piezo-resistance of sorting to be tested is put into the dish 2 that shakes by manual work; The dish 2 that shakes is served the dish material loading track 3 that shakes with micro loop piezo-resistance auto arrangement; It is upwards unified by photo-electric control resistor disc to be turned into electrode surface automatically; Deliver to hopper 4 through the material loading track, build up a string on test top rotary table 11; Test top rotary table 11 rotates the resistor disc of 12 li of containing holes will falling into test top rotary table 11 and delivers to electrode contraposition part 18 positions; After the rotation resistor disc makes electrode position and testing needle position consistency; Forwarding first measuring head 14 again to tests; The result is after PLC handles, and qualified just rotates with test top rotary table 11, and the element of having tested is sent to sorting mechanism and goes; First measuring head, 14 positions are underproof just to turn to second measuring head 14 and carries out second test with test top rotary table 11, and the result delivers to sorting mechanism after PLC handles.Sorting mechanism forwards to synchronously, during corresponding gear feed bin 32 positions, can be opened the self-closing dodge gate 30 of spring by action cylinder 31 resistance is fallen in the gear feed bin 32, accomplishes sorting work.
The utility model is not limited to above-mentioned embodiment; If the various changes of the utility model or distortion are not broken away from the spirit and the scope of the utility model; If these changes and distortion belong within the claim and equivalent technologies scope of the utility model, then the utility model also is intended to comprise these changes and distortion.
Claims (10)
1. the electrical property automatic testing equipment of a micro loop piezo-resistance is characterized in that: comprise feed mechanism, mechanism for testing, sorting mechanism and control circuit.
2. the electrical property automatic testing equipment of micro loop piezo-resistance according to claim 1; It is characterized in that: said feed mechanism comprises the dish that shakes, dish material loading track and slice turning device shake; The said dish that shakes connects the dish material loading track that shakes; The said dish material loading track that shakes connects a hopper, and said dish material loading track one side of shaking is provided with slice turning device.
3. the electrical property automatic testing equipment of micro loop piezo-resistance according to claim 2 is characterized in that: the said dish material loading track that shakes is an involute screw rising track.
4. the electrical property automatic testing equipment of micro loop piezo-resistance according to claim 2; It is characterized in that: said slice turning device comprises plate-turning action cylinder and at least two reflection from lens formula photoelectric sensors; The distance of two reflection from lens formula inductors is the size of a micro loop piezo-resistance; Said dish material loading track one side of shaking is provided with turns over the sheet Auxiliary Track, and the said sheet Auxiliary Track that turns over connects said hopper.
5. according to the electrical property automatic testing equipment of each described micro loop piezo-resistance of claim 1 to 4; It is characterized in that: said mechanism for testing comprises top rotary table, lower fixed disk, electrode contraposition part and measuring head; Said top rotary table is provided with the containing hole of ccontaining micro loop piezo-resistance; Said electrode contraposition part is located on the contraposition support; Said measuring head is located on the measuring head support, and the corresponding said electrode contraposition part of said lower fixed disk, said measuring head are provided with the through hole of diameter less than micro loop piezo-resistance diameter, and said lower fixed disk below is provided with the contraposition fore-set and test fore-set that slides up and down along said through hole; Said contraposition fore-set is located at a fore-set with the test fore-set and is moved up and down on the device, and said contraposition fore-set is provided with contraposition fore-set whirligig.
6. the electrical property automatic testing equipment of micro loop piezo-resistance according to claim 5 is characterized in that: said measuring head is at least two.
7. the electrical property automatic testing equipment of micro loop piezo-resistance according to claim 5 is characterized in that: said electrode contraposition part is a reflection from lens formula photoelectric sensor.
8. the electrical property automatic testing equipment of micro loop piezo-resistance according to claim 5; It is characterized in that: said fore-set moves up and down the movement platform that device comprises cam, pulley, connecting rod and is located at said connecting rod top, and said contraposition fore-set is located at the movement platform top with the test fore-set.
9. the electrical property automatic testing equipment of micro loop piezo-resistance according to claim 5 is characterized in that: said contraposition fore-set whirligig is the contraposition rotary electric machine.
10. the electrical property automatic testing equipment of micro loop piezo-resistance according to claim 5; It is characterized in that: said sorting mechanism comprises the sorting rotating disk; Said sorting rotating disk is provided with some gear cups, and said gear cup is provided with self-closing dodge gate of spring and the cylinder that is used for opening the self-closing dodge gate of spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203791533U CN202238692U (en) | 2011-09-28 | 2011-09-28 | Automatic tester for electrical performance of minitype annular piezoresistor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203791533U CN202238692U (en) | 2011-09-28 | 2011-09-28 | Automatic tester for electrical performance of minitype annular piezoresistor |
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| CN202238692U true CN202238692U (en) | 2012-05-30 |
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| CN2011203791533U Expired - Fee Related CN202238692U (en) | 2011-09-28 | 2011-09-28 | Automatic tester for electrical performance of minitype annular piezoresistor |
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