KR20100138154A - Electrical tester for led device - Google Patents

Abstract

PURPOSE: An electrical inspection machine for a light emitting diode is provided to simplify the entire structure of the machine by equipping the light emitting diode device in an elastically conductive sheet. CONSTITUTION: A pair of electrodes is in connection with a first pad and a second pad in order to implement an electrical test. A moving part(20) is movable in one direction. A conductive part(30) is loaded on the moving part. At least the surface of the conductive part is conductive. The lower side of an elastically conductive sheet(40) is in contact with the surface of the conductive part. The upper side of the elastically conductive sheet is in contact with the second pad.

Description

Electrical tester for LED device

The present invention relates to an electrical inspection equipment for LED, and more particularly to an electrical inspection equipment for LED that enables a reliable electrical connection with the LED device while simplifying the structure of the inspection equipment for LED.

In general, a predetermined electrical test is performed to determine whether an LED device is defective. To this end, after the block is fixed on the rotating plate, the LED is placed on the block and contacted with the pad of the LED using the probe tip of the inspection device to perform a predetermined electrical test.

Specifically, as shown in FIG. 1, after the plurality of blocks 120 are detachably installed by the bolts 150 on the rotating plate 110, the LED devices 130 are mounted on the respective blocks 120. Let's do it. The LED device 130 on the rotating rotating plate 110 is in contact with the pair of probe tips 140 and 141 as the LED device 130 placed in the block 120 of any one of the plurality of blocks 120. Certain electrical tests are performed. In this case, the LED device 130 includes a device body 133 and a pair of pads 131 and 132 disposed on an upper surface of the device body 133. The probe tips 140 and 141 are provided in pair so as to be in contact with the pair of pads 131 and 132, respectively, and each of the probe tips 140 and 141 is in contact with the pad. Each LED device 130 is returned from the block 120 when the inspection is completed, and a new LED device 130 that needs to be inspected is placed on the block.

As shown in FIG. 2, the electrical inspection apparatus according to the related art is vertically disposed so that the LED device 130 mounted on the block 120 does not escape from the block 120 during the rotation of the rotating plate 110. A hole 121 penetrates into the hole 121, and the hole 121 is configured to be in communication with the vacuum hole 111 provided in the rotating plate 110. Accordingly, when the LED device 130 is mounted on the block, the vacuum is operated so that the LED device 130 can be fixed in the block, thereby preventing the LED device 130 from being separated during the rotation process.

Electrical inspection equipment according to the prior art has the following problems.

First, recently, LED devices have tended to be miniaturized and miniaturized. Accordingly, a conventional LED device having a pair of pads on one side thereof has one pad on each side thereof as shown in FIG. 3. It is being changed to a deployed form. In the case of such a modified LED device, since the size is relatively small, there is a problem that it is difficult to maintain the attachment state on the upper surface of the block by vacuum. Specifically, the size of the LED is very small, such as 0.2 mm × 0.2 mm, making it difficult to hold by vacuum.

In addition, in the case of a conventional LED device, two pads are provided on the upper surface to easily contact the probe tip and the pad. However, in the case of a recent miniaturized LED device, one pad is disposed on the lower surface of the LED device. There is a problem that the electrical connection with the pad is not easy.

In addition, the electrical inspection equipment according to the prior art has to place a vacuum structure of a complex structure in the rotating plate, there is a problem that the overall equipment is expensive, there is a problem that can easily break down due to the complex structure. do.

The present invention was created to solve the above-mentioned problems, and more particularly, it is possible to easily determine whether the miniaturized LED device is defective, and to simplify the overall structure of the LED electrical inspection equipment for reducing the manufacturing cost It aims to provide.

Electrical test equipment for LED according to the present invention for achieving the above object, the first pad and the second pad to which a pair of electrodes for electrical test for inspecting the LED device provided on the upper and lower surfaces, respectively. An electrical inspection device for LED, comprising: a movable member movable in one direction;

A conductive member mounted to the moving member, the at least surface of which is configured to have conductivity capable of electrical flow; And

The lower surface is in contact with the surface of the conductive member and the upper surface is in contact with the second pad of the LED device, and when in contact with the second pad elastic conductive that can electrically connect the second pad and the conductive member to each other Including; sheets,

The elastic conductive sheet has a structure in which a plurality of conductive particles are distributed inside a viscoelastic base material.

In the electrical test equipment for the LED,

The base material of the elastic conductive sheet is preferably made of silicone rubber.

In the electrical test equipment for the LED,

The silicone rubber preferably has a Shore A hardness of 40 to 60.

In the electrical test equipment for the LED,

In the elastic conductive sheet, the conductive parts of the conductive material that are continuously arranged in the thickness direction in the base material to form the conductive particle group are preferably spaced apart from each other in a plane direction perpendicular to the thickness direction.

In the electrical test equipment for the LED,

It is preferable that the average particle diameter of the electroconductive particle of the said elastic conductive sheet is 10-30 micrometers.

In the electrical test equipment for the LED,

The conductive member is preferably detachably coupled to the moving member.

In the electric bottom inspection equipment for the LED, the moving member is preferably configured to include a rotating plate, a drive means for rotating the rotating plate.

In order to achieve the above object, a preferred electrical test equipment for LED of the present invention, the first pad and the second pad to which a pair of electrodes can be contacted for the electrical test to inspect the LED device provided on the upper and lower surfaces respectively. In the electrical inspection equipment for LED,

A movable member movable in one direction;

And an elastic conductive sheet coupled to a surface of the movable member and having an upper surface thereof in contact with a second pad of the LED device, the elastic conductive sheet having elasticity and electrical conductivity.

The elastic conductive sheet has a shape in which a plurality of conductive particles are distributed in a viscoelastic base material, and the conductive particles are formed in a thickness direction and a plane direction to enable electrical connection in a thickness direction and a direction perpendicular to the thickness direction. It is densely distributed.

According to the electrical inspection equipment for LEDs according to the present invention, since the LED device is mounted on the viscoelastic conductive sheet, it can be easily placed on the elastic conductive sheet even when the size of the LED device is reduced. There is this. That is, there is an advantage that it is possible to implement the inspection equipment suitable for the micro-sized LED device.

In addition, since the unnecessary unnecessary vacuum does not need to be provided in the moving member such as a rotating plate, there is an advantage of reducing the manufacturing cost of the entire inspection equipment.

In addition, the pad provided on the lower side of the LED device has the advantage of enabling an easy electrical connection since it is electrically connected to the probe tip by the elastic conductive sheet.

In addition, since the LED device can be connected to an elastic conductive pad having elasticity, even when the surface of the pad is not flat, the contact surface of the elastic conductive pad is elastically deformed to fit the surface of the pad so that close contact is possible. It has the advantage of maintaining a secure connection.

Hereinafter, with reference to the accompanying drawings, the electrical inspection equipment for the LED according to a preferred embodiment of the present invention will be described in detail.

Figure 4 is a perspective view of the electrical inspection equipment for LED according to a preferred embodiment of the present invention, Figure 5 is a cross-sectional view V-V of Figure 4, Figure 6 is an operation of FIG.

Electrical inspection equipment 10 for the LED of the preferred embodiment of the present invention is a device for determining whether the LED device 50 is defective. At this time, the LED device 50 is a pair of pads are provided on the upper or lower surface for the electrical test, specifically, the first pad 51 is disposed on the upper surface of the body of the device 50 and the device 50 The second pad 52 is provided on the lower surface of the body. Each of the first pad 51 and the second pad 52 is electrically connected to a pair of electrodes, so that a predetermined electrical test can be performed.

Meanwhile, the electrical test equipment 10 includes a moving member 20, a conductive member 30, and an elastic conductive sheet 40.

Specifically, the movable member 20, a rotating plate as in the prior art may be used. Such a rotating plate has a predetermined thickness as a whole and has a circular plate shape. The lower surface of the moving plate may be provided with a predetermined power means for rotating the moving plate. In addition, the power means of the moving plate is connected to a predetermined control unit so that when the inspection of any one LED device 50 is rotated so that the next LED device 50 can be inspected. On the other hand, since the rotating plate and the driving means, the control unit and the like are well-known technology, detailed description thereof will be omitted.

The conductive member 30 is mounted on the moving member 20 to have a rectangular parallelepiped shape as a whole. The conductive member 30 may be made of a metal material as a whole, but is not limited thereto, and may have a form in which a conductive plating layer is formed on the surface of the non-metal material.

In other words, any configuration can be used so that its surface has conductivity to have electrical flow. In addition, the conductive member 30 is not limited to the shape of a rectangular parallelepiped, and various design modifications are possible according to design conditions.

The conductive member 30 preferably uses a tungsten material having a relatively high conductivity and hardness, but is not limited thereto. Various metal materials may be used.

In addition, the conductive member 30 is detachably coupled to the moving member 20. Specifically, four corners of the conductive member 30 are formed with fastening holes 31 penetrating in the vertical direction, and the movable member 20 has screw grooves (not shown) corresponding to the fastening holes 31. It is formed. The conductive member 30 may be detachably coupled by screwing the bolt 32 inserted through the fastening hole 31 into the screw groove. However, the detachable coupling method of the conductive member 30 is not limited thereto, and various detachable coupling means may be used.

The elastic conductive sheet 40 may electrically connect the second pad 52 of the LED device 50 to any one of the pair of electrodes 60 and 61 while the LED device 50 is mounted thereon. It is a constitution. Specifically, in an inspection apparatus in which a pair of electrodes 60 and 61, such as a probe tip, is provided, any one of the electrodes 60 contacts the first pad 51 provided on the upper side of the LED device 50, and the other One electrode 61 is in contact with the conductive member 30, in which the function of the elastic conductive sheet 40 is to perform an electrical intermediate role between the second pad 52 and the conductive member 30.

The elastic conductive sheet 40 is in the form of a sheet having a thin thickness, the lower surface of the elastic conductive sheet 40 is in contact with the surface of the conductive member 30, the upper surface of the elastic conductive sheet 40 May be in contact with the second pad 52 of the LED device 50.

Specifically, the elastic conductive sheet 40 has a structure in which a plurality of conductive particles 42 are distributed in the base material 43 having viscoelastic properties.

In this case, the base material 43 may use various materials having both viscosity and elasticity. Specific examples thereof include conjugated diene rubbers such as polybutadiene rubber, natural rubber, polyisoprene rubber, styrene-butadiene copolymer rubber and acrylonitrile-butadiene copolymer rubber and their hydrogenated products; Block copolymer rubbers such as styrene-butadiene-diene block copolymer rubber and styrene-isoprene block copolymer rubber and their hydrogenated products; And chloroprene rubber, urethane rubber, polyester rubber, epichlorohydrin rubber, silicone rubber, urethane rubber, ethylene-propylene copolymer rubber and ethylene-propylene-diene copolymer rubber.

In order to impart other functional properties other than the above, it is preferable to use any other material other than the conjugated diene rubber. It is particularly preferable to use silicone rubber from the viewpoint of moldability and electrical properties.

The silicone rubber is preferably obtained by crosslinking or condensing a liquid silicone rubber. The liquid silicone rubber has a viscosity of 10 ⁻⁵ poise or less when measured at a shear rate of 10 ⁻¹ sec, and may be any of a condensation type, an addition type, and a form containing a vinyl group or a hydroxyl group. As a specific example, dimethyl silicone raw rubber, methyl vinyl silicone raw rubber, and methylphenyl vinyl silicone raw rubber are mentioned.

Suitable curing catalysts and the like may be used to cure the polymer-forming material. As such a curing catalyst, an organic peroxide, fatty acid azo compound or hydrosilylation catalyst can be used.

On the other hand, when the silicone rubber is used as the base material 43, it is preferable that the hardness is high while the elasticity is good. Specifically, it is preferable that the Shore A hardness is 40 or more and 60 or less. In this case, when the hardness of the silicone rubber is 40 or less, it is preferable because it is excellent in elasticity, but may be easily broken in the process of repeatedly mounting the LED in terms of hardness. In addition, when the hardness is 60 or more, it is preferable in terms of hardness, but there is a risk of mechanical impact on the pad during contact with the mounted LED, and it may not have sufficient elasticity, and thus it is not easy to elastically deform to the surface shape of the pad. It is not preferable because there is a problem that a sufficient contact surface cannot be formed.

The conductive particles 42 are arranged in the silicone rubber, and specifically, each conductive particle 42 is disposed in the silicone rubber to perform an electrical connection in the thickness direction. It is preferable to use the electroconductive particle 42 which shows magnetic so that such an electroconductive particle 42 may be easily arrange | positioned in the up-down direction during a shaping | molding process. As a specific example of such electroconductive particle 42, metal particles, such as nickel, iron, gold, silver, tungsten, and cobalt which show magnetic property, these alloy particles, or particle | grains containing these metals, these particles are used as a core particle. Particles obtained by plating the core particles with a highly conductive metal such as gold, silver, palladium or rhodium with good conductivity; Particles obtained by plating conductive cores such as nickel or cobalt on the core particles by using inorganic material particles or polymer particles such as nonmagnetic metal particles and glass beads as core particles; And particles obtained by coating the core particles with both a conductive magnetic material and a metal having good conductivity. In this, it is preferable to use the particle | grains obtained by plating metals, such as gold with good electroconductivity, on the core particle using nickel particle as a core particle.

The average particle diameter of the electroconductive particle 42 becomes like this. Preferably it is 1-1, OO micrometer, More preferably, it is 2-500 micrometers, More preferably, it is 5-300 micrometers, Especially preferably, it is 10-30 micrometers. If the particle diameter of the conductive particles 42 is too small, many conductive particles 42 are required for electrical connection, which is undesirable because there is a possibility that the total amount of silicone rubber is excessively reduced and the elasticity is reduced. In addition, when the particle diameter of the electroconductive particle 42 is too big | large, it is unpreferable in terms of the flatness of the elastic conductive sheet 40. FIG. That is, since the overall plane of the elastic conductive sheet 40 may be somewhat rugged, there is a fear that the contact with the second pad 52 of the LED device 50 may not be in a perfect contact state. This may cause a decrease in the overall electrical conductivity.

In addition, the form of electroconductive particle 42 is not specifically limited. However, from the viewpoint of easily dispersing such particles in the polymer-forming material, the particles are preferably spherical, but are not limited thereto. It is, of course, possible to have a needle-like or irregular shape.

In addition, with respect to the arrangement of the conductive particles 42, the conductive particles 42 may be arranged in the thickness direction with each other, and may be constituted by the conductive portions 41 forming the group of the conductive particles 42. That is, as shown in the enlarged view of FIG. 5, each of the conductive particles 42 is arranged in a line to form a conductive portion 41, and the conductive portion 41 has a plane direction perpendicular to the thickness direction. Can be spaced apart from each other to achieve a plurality.

As such, when the conductive parts 41 are spaced apart in the plane direction, each of the conductive parts 41 may be bent in an adjacent direction when the elastic conductive sheet 40 is pressed, thereby ensuring higher elasticity. You will receive.

Electrical inspection equipment for LED according to a preferred embodiment of the present invention described above acts as follows.

As shown in Fig. 6, the LED device is disposed on the elastic conductive sheet in a state where the conductive member and the elastic conductive sheet are mounted on the movable member. In this process, the second pad disposed under the LED device comes into contact with the top surface of the elastic conductive sheet. Thereafter, any one of the pair of electrodes consisting of a probe tip contacts the first pad disposed above the LED device and presses the LED device downward. In addition, the other electrode is brought into contact with the surface of the conductive member. Subsequently, when a predetermined electrical signal is applied through the electrode, the signal is transmitted to another electrode through the first pad, the second pad, the elastic conductive sheet, and the conductive member. Accordingly, whether the LED device is defective can be determined. On the other hand, after determining whether any LED device is defective, the rotating plate, which is a moving member, rotates to move the new LED device to a position where the electrode can be inspected, and the previously inspected LED device is returned to a place for transport. Will be moved.

On the other hand, in the present invention, since the viscous elastic conductive sheet is disposed on the movable member, even when the LED device is disposed on the elastic conductive sheet, there is a fear that the LED device may be dislodged in the moving process by the frictional force with the surface of the elastic conductive sheet. There will be no.

The electrical inspection device for LED inspection of the present invention has the following effects.

First, in the prior art, the position of the LED device was fixed on the moving member by using the vacuum. However, when the size of the LED device is small, the size of the hole used as the passage for the vacuum should be small, and thus the overall adsorption force is weak. Difficulty in attaching, etc. However, in the present embodiment, the LED device is placed on the elastic conductive sheet made of a viscous silicon material, thereby providing a constant adhesive force regardless of its size. In particular, there is an advantage that the LED device is not out of position by the friction force in the horizontal direction.

In addition, in this embodiment, in order to facilitate the measurement of the LED device provided with the upper pad and the lower pad, in particular, the inspection is made easy by arranging the elastic conductive sheet for electrical connection of the pad disposed on the lower side. To help.

In addition, in the present embodiment, since the vacuum hole and the vacuum device for preventing the separation of the LED device do not need to be separately provided in the moving member, the structure of the entire inspection equipment can be simplified, and thus the manufacturing cost can be reduced. have.

In the above described the electrical test equipment for LED according to a preferred embodiment of the present invention, but is not limited to this may be changed in various forms as follows.

First, in the above-described embodiment, the electrical inspection equipment for the LED is configured in a form in which the elastic conductive sheet is mounted on the conductive member, but is not limited thereto, and the elastic conductive sheet may be directly attached to the moving member.

That is, as shown in Figures 7 to 9, comprising a moving member 20 and the elastic conductive sheet 40, the elastic conductive sheet 40 is conductive particles 42 in the thickness direction and the surface direction It is densely distributed. As the conductive particles 42 are densely distributed in the surface direction as well as in the thickness direction, the electrical signals can flow not only in the thickness direction but also in the surface direction. Therefore, when the LED device 50 is mounted on the elastic conductive sheet 40, any one electrode 60 of the inspection apparatus contacts the first pad 51 disposed above the LED device 50, The other electrode 61 is in contact with the upper surface of the elastic conductive sheet 40. Accordingly, when a signal is applied, the signal passes through the first pad 51, the second pad 52, and the elastic conductive sheet 40, so that a test for a predetermined defect is performed.

In addition, in the preferred embodiment of the present invention, the moving member is not limited to the rotating plate. For example, as illustrated in FIG. 10, a linear moving device (for example, a conveyor belt) or the like may be used, and various other moving devices may be used. Electrical inspection equipment for LED according to a preferred embodiment of the present invention is characterized in that the positional deviation can be prevented in spite of the movement in the various moving members.

Although the present invention has been described in detail with reference to preferred embodiments, the present invention is not necessarily limited to these embodiments and modifications, and various modifications can be made without departing from the spirit of the present invention.

1 is a view of the inspection equipment for LEDs according to the prior art.

2 is a cross-sectional view of FIG.

3 is a diagram of a novel LED device.

Figure 4 is a perspective view of the electrical inspection equipment for LED according to a preferred embodiment of the present invention.

5 is a cross-sectional view taken along line V-V of FIG.

6 is an operation of FIG.

Figure 7 is a perspective view of the electrical inspection equipment for LED according to another embodiment of the present invention.

8 is a VIII-VIII cross-sectional view of FIG. 7.

9 is an operation of FIG. 8.

Figure 10 is a perspective view of the electrical inspection equipment for LED according to another embodiment of the present invention.

<Detailed Description of Drawings>

10 Inspection equipment 20 Moving member

30 ... conductive member 40 ... elastic conductive sheet

41.Conductive Part 42 ... Conductive Particles

43 ... substrate 50 ... device

51 ... first pad 52 ... second pad

60 ... electrode 61 ... electrode

Claims (8)

In the electrical inspection equipment for LED for inspecting the LED device provided on the upper and lower surfaces of the first pad and the second pad to which a pair of electrodes for electrical test can be contacted, A movable member movable in one direction; A conductive member mounted to the moving member, the at least surface of which is configured to have conductivity capable of electrical flow; And The lower surface is in contact with the surface of the conductive member and the upper surface is in contact with the second pad of the LED device, and when in contact with the second pad elastic conductive that can electrically connect the second pad and the conductive member to each other Including; sheets, The elastic conductive sheet is an electrical inspection equipment for LED, characterized in that it has a structure in which a plurality of conductive particles are distributed in the base material having a viscoelasticity. The method of claim 1, Electrical inspection equipment for the LED, characterized in that the base material of the elastic conductive sheet is made of silicone rubber. The method of claim 2, The silicon rubber is an electrical inspection equipment for LED, characterized in that Shore A hardness (shore A hardness) is 40 ~ 60. The method of claim 1, The elastic conductive sheet is for LED, characterized in that the conductive parts in the base material are continuously arranged in the thickness direction to form a conductive particle group, spaced apart from each other in a plane direction perpendicular to the thickness direction Electrical inspection equipment. The method according to claim 1 or 4, Electrical inspection equipment for the LED, characterized in that the average particle diameter of the conductive particles of the elastic conductive sheet is 10 ~ 30㎛. The method of claim 1, The conductive member is an electrical inspection equipment for the LED, characterized in that detachably coupled to the moving member. The method of claim 1, The moving member is a rotating plate, the electrical inspection equipment for LED, characterized in that it comprises a drive means for the rotation of the rotating plate. In the electrical inspection equipment for LED for inspecting the LED device provided on the upper and lower surfaces of the first pad and the second pad to which a pair of electrodes for electrical test can be contacted, A movable member movable in one direction; And an elastic conductive sheet coupled to a surface of the movable member and having an upper surface thereof in contact with a second pad of the LED device, the elastic conductive sheet having elasticity and electrical conductivity. The elastic conductive sheet has a shape in which a plurality of conductive particles are distributed in a viscoelastic base material, and the conductive particles are formed in a thickness direction and a plane direction to enable electrical connection in a thickness direction and a direction perpendicular to the thickness direction. Electrical inspection equipment for LEDs, characterized in that the densely distributed.

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