CN219085008U

CN219085008U - Edge finder

Info

Publication number: CN219085008U
Application number: CN202223379621.4U
Authority: CN
Inventors: 王守跃; 丁长兵; 陶瓷; 王涛
Original assignee: Huaian Aucksun Optoelectronics Technology Co Ltd
Current assignee: Huaian Aucksun Optoelectronics Technology Co Ltd
Priority date: 2022-12-16
Filing date: 2022-12-16
Publication date: 2023-05-26
Anticipated expiration: 2032-12-16

Abstract

The utility model discloses an edge finder, which comprises a base, wherein an upper cantilever and a lower cantilever are fixedly arranged on the base, a magnetic column is fixedly arranged on the upper cantilever, and a lower contact is arranged on the lower cantilever; one end of the spring plate is fixedly connected with the base, the other end of the spring plate is connected with the circuit board, the circuit board is fixedly provided with a magnet, the magnet is positioned under the magnetic column, the magnetic pole at the upper end of the magnet is identical to the magnetic pole at the lower end of the magnetic column, the circuit board is provided with an upper contact, the upper contact is contacted with the lower contact under the repulsive force of the magnetic column and the magnet, the circuit board is provided with a hole, and the T-shaped limiting part penetrates through the hole to be fixedly connected with the lower cantilever. The copper plays a lower limit supporting and conducting role, the copper nail plays an upper limit role, when a person presses the needle with force, the range of the circuit board is limited, the force born by the elastic sheet is reduced, and the copper nail is not easy to deform. The magnetic pole at the upper end of the magnet is the same as the magnetic pole at the lower end of the magnetic column, a repulsive force is formed, and after the elastic sheet is deformed, the contact point always touches under the combined action of the repulsive force and the weight of the needle chuck.

Description

Edge finder

Technical Field

The utility model relates to a point measurement device for detecting the performance of a semiconductor crystal grain by using a probe, in particular to an edge finder.

Background

Patent CN 202757956U discloses a spot-testing apparatus as an apparatus for detecting performance or characteristic parameters of semiconductor dies such as light emitting diodes using probes. The spot measurement device generally comprises at least one edge finder, as shown in fig. 1 and 2, the conventional edge finder 100 comprises a base 110, a cantilever 120, an elastic piece 130 connected between the base 110 and the cantilever 120, and a probe 140 disposed at one end of the cantilever 120, an adjustable pre-force applicator 150 is further disposed between the cantilever 120 and the base 110, and

electrical conductors

160 and 170 respectively fixed to the cantilever 120 and the base 110, wherein the two

electrical conductors

160 and 170 are kept in contact and electrically connected by the pre-force applied by the pre-force applicator (magnet) 150.

When the edge finder 100 is in use, the probe 140 is electrically connected to a test machine. The edge finder 100 is driven to descend by a feeding mechanism capable of vertically reciprocating or to ascend by a carrying table capable of vertically reciprocating, and the probe 140 can contact with the object to be tested, so that the tester can output Test signals to the object to be tested and receive Test results from the object to be tested, so as to detect or verify the electric Lu Liang or electric characteristics of the object to be tested.

The magnet 150 is positioned between the positive and negative contacts 160 and the spring 130, and the contact-attraction-spring-needle mating relationship is finally formed from left to right.

When the needle is replaced by a production person, the elastic sheet is easy to deform by using different forces, so that the gram weight of the needle is influenced, and various anomalies (such as VFD, VF3, IR, large needle mark and the like) of the test piece source are finally caused.

When a person replaces a needle, the needle clamping heads are mutually extruded up and down by fingers and a straight line, the elastic sheet is easy to bend and deform up and down due to the generated force, the elastic sheet is deformed too much only because of the limitation of the stress amplitude, and then the contact point is always disconnected or always contacted when the needle is inserted, so that the current through the crystal grains is disconnected or the edge detector is alarmed. The force of attraction of the two magnets is far smaller than the deformation of the elastic sheet caused by manpower, and the two magnets cannot be recovered through the attraction of the magnets, so that a normally open road state is fixedly caused.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model designs the edge finder, wherein the copper plate plays a role of lower limit support and conductivity, the copper nail plays a role of upper limit, when a person presses the needle by force, the range of the circuit board is limited, the force born by the elastic sheet is reduced, and the elastic sheet is not easy to deform. The magnetic pole at the upper end of the magnet is the same as the magnetic pole at the lower end of the magnetic column, a repulsive force is formed, and after the elastic sheet is deformed, the contact point always touches under the combined action of the repulsive force and the weight of the needle chuck.

The technical scheme disclosed by the utility model is as follows: an edge finder comprising:

the base is fixedly provided with an upper cantilever and a lower cantilever, the upper cantilever is fixedly provided with a magnetic column, and the lower cantilever is provided with a lower contact;

the elastic sheet is fixedly connected with the base at one end and the circuit board at the other end, the magnet is fixed on the circuit board and is positioned under the magnetic column, the magnetic pole at the upper end of the magnet is identical to the magnetic pole at the lower end of the magnetic column, the circuit board is provided with an upper contact, the upper contact is contacted with the lower contact under the repulsive force of the magnetic column and the magnet, the circuit board is provided with a hole, and the T-shaped limiting part penetrates through the hole to be fixedly connected with the lower cantilever.

On the basis of the above scheme, preferably, the magnet is located between the spring plate and the upper contact.

On the basis of the scheme, preferably, the upper contact is positioned on the lower end face of the circuit board, and the lower contact is positioned on the upper end face of the lower cantilever.

On the basis of the above scheme, preferably, the limiting member is a screw.

In addition to the above, preferably, the lower arm is fixed to the lower end surface of the base by a screw.

On the basis of the above scheme, preferably, the lower cantilever is a copper plate.

On the basis of the scheme, preferably, the upper cantilever is provided with a through hole, the magnetic column penetrates through the through hole, and the locking screw locks the magnetic column from the locking hole on the side face of the upper cantilever.

Compared with the prior art, the utility model has the following beneficial effects:

the elastic sheet, repulsive force, limited copper nail, contact and needle are formed from left to right, the copper plate plays a role of lower limit support and conduction, the copper nail plays a role of upper limit, when a person presses the needle by force, the range of the circuit board is limited, the force applied by the elastic sheet is reduced, and the elastic sheet is not easy to deform.

Aiming at the fixing device for adjusting the gram weight magnetic column, a notch is cut at the end part of the upper cantilever, the notch is communicated with the through hole, and the notch is connected through a screw nut to achieve the effect of fixing and locking.

The magnetic pole at the upper end of the magnet is the same as the magnetic pole at the lower end of the magnetic column, a repulsive force is formed, and after the elastic sheet is deformed, the contact point always touches under the combined action of the repulsive force and the weight of the needle chuck.

Drawings

FIG. 1 is a perspective view of a prior art edge finder;

FIG. 2 is a side view of FIG. 1;

FIG. 3 is a schematic diagram of the structure of the present utility model;

fig. 4 is a top view of the upper cantilever of fig. 3.

Detailed Description

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following description will explain the specific embodiments of the present utility model with reference to the accompanying drawings. It is evident that the drawings in the following description are only examples of the utility model, from which other drawings and other embodiments can be obtained by a person skilled in the art without inventive effort.

As shown in fig. 3-4, an edge finder comprises a base 1, a spring plate 2 and the like.

The base is fixedly provided with an upper cantilever 3 and a lower cantilever 4, the upper cantilever is fixedly provided with a magnetic column 5, the magnetic column can be adjusted up and down relative to the upper cantilever so as to change the protruding length of the lower end face of the magnetic column, the traditional upper cantilever is provided with a through hole 12, the magnetic column penetrates through the through hole, and a locking screw locks the magnetic column from a locking hole on the side face of the upper cantilever. In this application, a notch 11 is opened at the tip of last cantilever, and the breach communicates with the through-hole, locks through screw nut in breach department, and fastening effect is good, and lower cantilever is a copper, and the left end of this copper passes through a plurality of screw fixation at the lower terminal surface left end of base, and the up end of lower cantilever has down contact 6.

The left end of the spring plate 2 is fixed at the right end of the lower end face of the base through a screw, the right end of the spring plate is connected with the left end of the circuit board 10 through a screw, the circuit board is fixedly provided with a magnet 7, the magnet is positioned right below the magnetic column, the magnetic pole of the upper end of the magnet is identical with the magnetic pole of the lower end of the magnetic column, the circuit board is provided with an upper contact 8, and the upper contact is contacted with the lower contact under the repulsive force of the magnetic column and the magnet.

The magnet is positioned between the spring plate and the upper contact.

The circuit board is provided with a hole, and the T-shaped limiting piece penetrates through the hole to be fixedly connected with the lower cantilever.

In the scheme, the problem that the dynamics of using to personnel's trading needle can't be restricted has been designed copper and copper nail, and the copper plays a lower limit and supports and electrically conducts effect, and the copper nail plays the effect of an upper limit, and personnel are when trading the needle and squeezing hard, and circuit board range of amplitude is limited, and the power that the shell fragment received reduces, non-deformable.

It should be noted that the above embodiments can be freely combined as needed. The foregoing is merely a preferred embodiment of the present utility model and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present utility model, which are intended to be comprehended within the scope of the present utility model.

Claims

1. An edge finder, comprising:

2. The edge finder as defined in claim 1, wherein the magnet is located between the spring and the upper contact.

3. The edge finder as defined in claim 2, wherein the upper contact is located at a lower end surface of the circuit board and the lower contact is located at an upper end surface of the lower cantilever.

4. The edge finder of claim 1 wherein the tee is a screw.

5. The edge finder as defined in claim 1, wherein the lower cantilever is fixed to the lower end surface of the base by a screw.

6. The edge finder of claim 1 wherein the lower cantilever is a copper plate.

7. The edge finder as defined in claim 1, wherein the upper cantilever has a through hole, the magnetic pole passes through the through hole, the end of the upper cantilever has a notch, the notch is connected with the through hole, and the notch is locked by a screw nut.