KR102016858B1 - Centrifugal precipitation apparatus for fluorescent material of led packages having gradient adjusting means - Google Patents

Abstract

The present invention relates to a manufacturing device of an LED package capable of reducing a precipitation time of a fluorescent substance and increasing a yield rate. A centrifugal precipitation device for a fluorescent substance comprises: a drum body (2100) rotated by control of a drive motor; and a plurality of holder units (2200) arranged in an inner circumferential side of the drum body and having lead frames mounted thereon. The holder unit maintains a horizontal state to prevent resin materials from tipping or overflowing due to an inclination with respect to a direction of gravity in a driving process for mounting the lead frame.

Description

CENTRIFUGAL PRECIPITATION APPARATUS FOR FLUORESCENT MATERIAL OF LED PACKAGES HAVING GRADIENT ADJUSTING MEANS}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the manufacture of LEDs, and more particularly, to an apparatus for manufacturing an LED package, which can shorten the settling time of a phosphor and improve a yield.

LED (Light Emitting Diode) is a semiconductor device that converts electrical energy into light energy, and is composed of a compound semiconductor that emits light of a specific wavelength according to the energy band gap. Recently, LED has been used in various fields such as optical communication and display. Such LEDs are provided in a predetermined package form so that they can be applied according to various uses or processes.

Looking at the process in the conventional LED manufacturing, the die bonding process of bonding the LED chip to the lead frame (Lead Frame) and the wire bonding process (LED) for connecting each lead in circuit through the wire and LED Dispensing (Dispensing) process for applying a fluorescent material to the chip.

In the manufacturing process of such an LED package, it is common to enter a next process after a curing process in a cure oven for each lead frame.

Korean Laid-Open Patent Publication No. 10-2011-0136290 discloses a method for applying a phosphor of a conventional light emitting diode, and FIG. 1 is a view showing a light emitting diode by such a manufacturing process.

Specifically, the light emitting diode chip 100 is accommodated in the package body 120 to emit light, and the phosphor 131 is formed by being precipitated on the surface of the light emitting diode chip 100. The silicon encapsulant 132 is injected onto the light emitting diode chip 100 and then cured to surround the light emitting diode chip 100 and the phosphor 131.

In the manufacturing process of the light emitting diode chip, the color temperature and the slope are determined between the wavelength of the light emitting diode chip 100 and the wavelength of the phosphor 131 to determine the mixing ratio of the phosphor 131 and the silicon encapsulant 132. After mixing the two materials at the mixing ratio to form the mixture 130, the mixture 130 mixed at the mixing ratio is injected into the package body 120 in which the light emitting diode chip 100 is accommodated, and the mixture 130 In this step, the phosphor 131 passes a predetermined time at a preset temperature so that the phosphor 131 is deposited on the surface of the light emitting diode chip 100. Therefore, when the phosphor 131 and the silicon encapsulant 132 are mixed and slurry is injected into the package main body 120, the phosphor 131 due to the difference in specific gravity between the silicon encapsulant 132 and the phosphor 131. Is deposited on the surface of the light emitting diode chip 100.

Then, the step of curing the silicon encapsulant 132 is completed to complete the light emitting diode of the present invention.

As mentioned above, the demand for LEDs is increasing rapidly in recent years, and it is necessary to improve the efficiency of the process for mass production to satisfy such demand.

However, some time is inevitably required in the precipitation process and the curing process of the above-mentioned phosphors, which leads to inefficiency of the process.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a phosphor centrifugal precipitator of the LED package that can increase the productivity by dramatically improving the efficiency of the process for the precipitation in the manufacturing process of the LED. do.

In addition, the present invention, in the application of centrifugal precipitation in the manufacture of the LED package, the phosphor centrifuge of the LED package to satisfy the demand for reducing the dispersion, brightness enhancement and heat generation improvement through forced precipitation of the material in the process to improve the yield It is an object to provide a precipitation device.

The present invention includes a drum body 2100 rotatable under the control of a drive motor and a plurality of holder parts 2200 disposed on an inner circumferential side of the drum body to which lead frames are mounted, wherein the holder part supports mounting of the lead frame. Provided is a phosphor centrifugal sedimentation apparatus for maintaining a horizontal state to prevent the tipping or overflow of the resin due to the inclination to the direction of gravity in the driving process.

As an example, the holder part may include a pivoting part 2220 rotatable in a vertical direction on an inner circumferential side of the drum body, and a holder driving part 2230 adjusting an angle of a lead frame based on the pivoting part.

The rotating part may be provided on any one side selected from both sides of the holder body.

In addition, the holder part is preferably such that the bottom surface of the lead frame is adjacent to the inner circumferential side of the drum body during the centrifugal driving process, and maintains the lead frame in the horizontal direction when the centrifugal driving is completed and the discharge driving is performed.

The inlet driving is divided into half of the circumferential direction of the drum body by sequentially mounting the lead frame while rotating in the forward direction with respect to the holder portion disposed in one direction, the lead frame sequentially while rotating in the reverse direction with respect to the other holder portion disposed Can be fitted.

According to the present invention described above, in the process for centrifugal precipitation of the LED package, it is possible to prevent the tilting or overflow phenomenon that occurs before or after the centrifugal force is applied, as well as to control the undesirable disturbance of the phosphor is completed precipitation. There is an effect leading to the reliability of the production process.

In addition, since the structure for improving the yield is simple and the space utilization is improved, productivity is improved, and there is an effect of having an economical production structure.

1 is a view showing a light emitting diode by a method of applying a phosphor of a conventional light emitting diode.
2 is a view for explaining a phosphor centrifugal precipitation apparatus having a tilt adjusting means according to the concept of the present invention.
Figure 3 is a side view showing the holder portion of the phosphor centrifugal precipitation apparatus having a tilt adjusting means according to an embodiment of the present invention.
Figure 4 is a flow chart for explaining the operation of the phosphor centrifugal precipitation apparatus having a tilt adjusting means of the present invention.
Figure 5 is a block diagram for explaining an embodiment of the input drive in the phosphor centrifugal precipitation apparatus having a tilt control means of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail a phosphor centrifugal precipitation apparatus having a tilt control means according to a preferred embodiment of the present invention.

In the following description, when a part is 'connected' to another part, this includes not only a case in which the part is directly connected, but also a case in which another element or device is interposed therebetween. In addition, when a part is said to "include" a certain component, it means that it may further include other components, except to exclude other components unless otherwise stated.

Basically, the present invention applies a precipitation method by centrifugal force for the precipitation of the phosphor as a lead frame unit in which a plurality of LEDs are mounted, but prevents the tipping or overflow caused by the inclination that occurs when the centrifugal force is not substantially applied. It provides a phosphor centrifugal precipitation apparatus having a tilt control means for maintaining a horizontal state to be able to.

In the present invention, it is basically to reduce the time required for the precipitation process in the step before dispensing and curing the resin material such as epoxy or silicon and phosphor in the LED chip, integrated with the device for curing It may also be considered to be formed as.

Regardless of the type and type of LED, lead frame and magazine applied in the present invention, it is noted that the concept of the present invention includes the process of precipitation, sedimentation or separation of mixed materials in various types of semiconductor processes.

2 is a view for explaining a phosphor centrifugal precipitation apparatus having a tilt adjusting means according to the concept of the present invention.

The cylindrical drum body 2100 supports the plurality of lead frames 1000 on the inner circumferential side in order to configure the phosphor centrifugal precipitating apparatus, and rotates around the rotating shaft 2110 so that the phosphor is precipitated by centrifugal force.

The lead frame 1000 of the flat form in which a plurality of LEDs are arranged may be led in and out of the circumference of the drum body 2100, preferably, the lower side of the drum body 2100. Various known configurations, such as a robot arm, can be applied, so detailed description thereof will be omitted.

In a preferred embodiment, the inner circumferential side of the drum body 2100 is provided with holder portions 2200 on which one or more lead frames 1000 can be mounted, respectively, as shown in the lower side of the drum body 2100. When the lead frame 1000 is mounted in a holder part 2200 disposed in the holder part 2 by a feeding force by a predetermined feeding part, and the mounting of the lead frame 1000 in one holder part 2200 is completed, the drum body 2100 may be used. Is partially rotated so that the next holder portion 2200 is located in the input portion 1010 located below the lead frame 1000 can be mounted sequentially.

In the state in which the lead frames 1000 are mounted on the drum body 2100, phosphors are precipitated by the difference in specific gravity according to the centrifugal force in the circumferential direction while rotating according to the rotational force of the driving motor (not shown). At this time, the drive motor may be made of a spindle motor, the maximum number of revolutions is preferably 2,000RPM, but is not necessarily limited thereto.

In case of precipitation by centrifugal force, it has the advantage of remarkably shortening the process time compared to the conventional manufacturing process using the natural sedimentation method by self weight, and the speed of the process according to the selection of the number of revolutions and the diameter of the drum body 2100. There is also an advantage to control. However, a predetermined inclination may occur in the process of inserting the lead frames 1000, except for a portion facing the input unit 1010 and the rotational shaft 2110, and the inclination may lead to problems such as tipping or overflowing of the resin. have. In addition, even when the centrifugal precipitation process is completed, the inclination of the phosphor may be disturbed in the process of waiting for the discharge at the inlet 1010 side. In particular, when the radius of the resin receiving portion of the chip is relatively large, this problem is exacerbated, which leads to a problem of yield.

In the present invention, in order to solve this, each holder portion 2200 is coupled to the inner circumferential side of the drum body 2100, the concept that is rotatably connected to maintain a horizontal state in accordance with the rotation of the drum body 2100 present.

As shown in the drawing, the holder part 2200 maintains a direction perpendicular to gravity in the process of drawing in and out of the drum body 2100 of the lead frames 1000, for example, at the input part 1010 side. Even when the mounting of the lead frame 1000 is completed and the drum body 2100 is rotated so that the other holder part 2200 is disposed in the input part 1010, each holder part 2200 is connected to the drum body 2100. The angle of the inner circumferential joint is changed to maintain the arrangement in the horizontal direction.

In the description of the present invention, the horizontal direction basically means that the bottom surface of the lead frame 1000 faces the gravity direction, the surface of the lead frame is perpendicular to the gravity direction, or the lead frame 1000 of the holder part 2200. It means that the seating surface supporting the bearing is directed in the direction opposite to gravity.

3 is a side view for explaining a holder unit according to an embodiment of the present invention.

As described above, each holder portion 2200 seats the lead frame 1000 to maintain the direction parallel to the tangent during rotation for providing the centrifugal force of the drum body 2100 and the lead frames 1000 are positioned at the correct positions. Do it.

The holder part 2200 may include a seating surface (not shown) of the body supporting the bottom of the lead frame 1000, and a holder rib 2210 for supporting a corner portion of the lead frame 1000 from the outside of the seating surface. It may be provided. The holder ribs 2210 may be formed in various forms according to a selection, but at least the holder ribs 2210 may be formed to surround a part of an outer side surface and an outer upper surface of the lead frame 1000.

For example, the holder rib 2210 may be considered to have a height in which the height corresponds to the height of the lead frame 1000 and the gap is formed in a '-' shape corresponding to the distance of the lead frame 1000. . Referring to FIG. 2, since the input unit 1010 is located at the lower front of the drum body 2100, the input position of each holder unit 2200 also becomes a side surface and corresponds to the position of the input unit 1010. An input position of the holder part 2200 may be disposed at the front side to enable the withdrawal of the 1000. Here, the front means the longitudinal direction of the rotation shaft 2110 and the front and rear may be interchanged depending on the arrangement state.

When the holder rib 2210 has a fixed shape, it may correspond to a lead frame 1000 having a single size and shape, and this may mean that the holder rib 2210 or the other type of lead frame 1000 is mounted. Inconsistency in that the holder portion 2200 needs to be replaced may occur. In consideration of this, it is preferable that the holder ribs 2210 have an adjustable width or a predetermined allowable width so as to correspond to the lead frames 1000 having various sizes. In the embodiment shown in FIG. It is shown that 2210 has an inclined shape and the mutual gap is adjacent to the upper side (closer to the rotation axis when the centrifugal force is applied).

As described above, when the holder ribs 2210 are inclined to be adjacent to each other toward the upper side, the width of the holder ribs 2210 is narrower toward the upper side and narrows toward the upper side, so that the upper and lower widths of the lead frame 1000 are increased. It can correspond to the width. When the width of the lead frame 1000 is smaller than the distance between the holder ribs 2210 in the state of being seated on the seating surface, the left and right flow may occur to some extent, but when the centrifugal force is applied, the state of close contact with the seating surface is maintained. This problem can be ignored because it can be maintained. Such a structure is particularly applicable to the concept of the present invention in which the holder part 2200 maintains a horizontal state in a draw-out process in which a centrifugal force is not applied as in the present invention, and a state perpendicular to the radial direction in a process in which a centrifugal force is applied. It should be noted that this may be more advantageous.

One end of the body portion is provided with a rotating part 2220 coupled to be rotatable at the inner circumferential side of the drum body 2100, the holder for providing a driving force to vary the angle of the body in the rotating part 2220 The driving unit 2230 may be coupled to the rotating unit 2220 side.

When the lead frame 1000 is drawn in and out, there is a difference in the amount of inclination adjustment in each holder part 2200 according to the rotation of the drum body 2100, and the holder driving part 2230 is each holder part 2200 for individual control. It may be desirable to be provided at, but it may be considered that any one holder driving unit 2230 to perform the inclination control drive for the plurality of holder unit 2200.

The holder driving unit 2230 may be basically composed of a motor that can control the rotation angle of the rotating unit 2220 according to the input of the control power. However, the balancer may have a predetermined weight chain balancer so as to recognize the gravity direction, and the balancer may function as the holder driving unit 2230. At this time, the arrangement position of the balancer may be considered to be disposed below the body of the holder portion 2200, but a variety of known weight combination method that can maintain a vertical direction according to the middle age direction may be applied to this detailed description Is omitted.

Hereinafter, according to the concept of the present invention will be described a method in which the phosphor centrifugal precipitation apparatus having a tilt control means operates for the input and centrifugation of the lead frame.

Figure 4 is a flow chart for explaining the operation of the phosphor centrifugal precipitation apparatus having a tilt adjusting means of the present invention.

The drum body 2100 in a state in which the lead frames 1000 are not mounted is prepared for input from the horizontal alignment step S100 in which the holder portions 2200 are aligned in a horizontal state.

At this time, each of the holder portion 2200 as one embodiment, all of the horizontal alignment in the current circumferential position may be made synchronized, but in another embodiment sequentially from the step immediately before being disposed on the input portion 1010 side Horizontal alignment may also be considered.

When at least the holder unit 2200 is horizontally aligned on the input unit 1010 side, the lead frame input step S110 is performed by the input operation by the user or the input by a predetermined input means. At this time, the drum body 2100 may be in a state in which a part of the front or the rear is open, and in the embodiment of the present invention, since the lead portion 1010 is disposed on the lead frame 1000, In the position in the axial direction of the drum body 2100 can be made. Here, the holder part 2200 may correspond to the width of the lead frame 1000 according to the shape or adjustment of the holder ribs 2210.

When one lead frame 1000 is mounted on one holder part 2200 disposed in the inlet part 1010, the drum body 2100 places the next holder part 2200 in the inlet part 1010. It is referred to as an input drive step (S120). This input drive may be controlled by a rotation angle made by the driving motor and corresponding to the circumferential arrangement interval of the holder portion 2200. In order to control the tilting of the holder unit 2200 or the rotation amount or the rotational speed of the drum body 2100, a predetermined control unit may be connected to each driving system, but a known motor control element may be applied in this regard. Description is omitted.

In this way, the input of the lead frame (S110) and the input driving (S120) are sequentially performed, and whether the lead frames 1000 are mounted on all the holder parts 2200 is determined in the input completion determination step (S200). The input completion determination may be basically determined by the control unit on the basis of the rotation amount of the drum body 2100 set in the input driving process, it may be made through a predetermined contact sensor or the like in each holder 2200. Of course, it can also be made by the user's visual judgment.

If it is determined that the input is not completed in the input completion determination, horizontal alignment (S100), lead frame input (S110), the input drive (S120) may continue. At this time, it is noted that at least the holder part 2200 on which the lead frame 1000 is mounted according to the rotation in the input driving process is continuously adjusted for the horizontal angle.

When the input is completed in the horizontal adjustment state of the lead frame 1000 through the above process, the drum body 2100 is rotated for centrifugal precipitation and enters the centrifugal driving step (S210).

In the centrifugal driving process, the holder part 2200 adjoins the bottom of each lead frame 1000 to the inner circumferential side of the drum body 2100 so that the centrifugal force acts in the height direction of the lead frame 1000. It is called a rotation step (S220). This centrifugal rotation step is based on the mounting surface of the holder portion 2200, that is, the surface of the lead frame 1000 is arranged to be perpendicular to the diameter.

The process of the centrifugal rotation (S220) may be optional before the start of the centrifugal driving (S210), the process of starting the centrifugal driving or reaching a suitable rotational speed for providing the centrifugal force, but before the centrifugal driving is started. However, when the inclination occurs in the horizontal direction in a situation in which the centrifugal force in the outer circumferential direction is applied when a predetermined rotational speed is reached, unnecessary tilting may occur due to gravity or centrifugal force.

Therefore, while receiving the rotational force from the rotating shaft 2110, the drum body 2100 starts to rotate while the centrifugal driving (S210) starts and reaches a predetermined rotational speed, the centrifugal rotation (S220) is gradually performed. Preferably, in the illustrated embodiment, centrifugal rotation is performed after the centrifugal driving is started.

Figure 5 is a block diagram for explaining an embodiment of the input drive in the phosphor centrifugal precipitation apparatus having a tilt control means of the present invention.

Referring to FIG. 3, the arrangement of the rotating part 2220 to which the holder part 2200 is connected to the drum body 2100 may be optional. Basically, when the rotating part 2220 is disposed on either side of the holder part 2200, the rotation angle may be limited, and in some cases, the holder part 2200 is reversed (the resin of the chip faces the lower side). ) May occur.

Considering such an arrangement state, the holder parts 2200 are considered to be symmetrically arranged with respect to a vertical line corresponding to the virtual diameter on both sides with any one holder part 2200 disposed on the input part 1010 side. Could be.

Referring to FIG. 2, when the lead frame 1000 is to be sequentially mounted on an array of holder parts 2200 on the left side based on a symmetrically arranged state, rotation is made in a counterclockwise direction, and the holder part on the right side ( When mounted in the arrangement of 2200 it would be natural to rotate in the clockwise direction. In this case, it is assumed that the rotating part 2220 of each holder part 2200 is formed on the side close to the inner circumferential side of the drum body 2100 in a horizontal state. At this time, the rotating part of the holder portion 2200 disposed on the top and bottom may be optional. In some cases, the holder part 2200 disposed at an upper end of the input part 1010 with respect to the rotation shaft 2110 may be allowed to be disposed while facing the ground. This is because when the lead frame 1000 is disposed perpendicular to the direction of gravity, the state of charge of the resin can be maintained by the surface tension, and at least the left and right tilting does not occur, so that the precipitation can be made equally with other parts in the centrifugal driving process. Because.

Therefore, the input driving S120 is driven in a forward direction (S121) to inject the lead frame 1000 into the arrangement of the holder portion 2200 on one side, and the holder portion 2200 on the other side by driving in the reverse direction (S122) ) May be divided into a process of inputting the lead frames 1000 to the arrangement of the?

In the case of the above example, when the rotating part 2220 is formed on any one side of the holder part 2200 in the horizontal state, a suitable embodiment has been described, but in some cases, the holder part 2200 as the inclination adjusting means of the holder part 2200. It may be considered a structure having a tilting rotation axis or a link structure or a robot arm in the center of the width direction of the body in this case it may be possible to control 360 degrees. In this case, the mounting of the lead frame 1000 to the entire holder part 2200 may be completed in any one direction of driving.

On the other hand, when the input and the centrifugal drive is completed as described above, the discharge may be made, such as the horizontal alignment, the lead frame discharge, the discharge drive process is the horizontal alignment (S100), the input of the lead frame (S110), the input Since the description of the driving (S120) may be applicable, a detailed description thereof will be omitted.

According to the concept of the present invention described above, in the process for centrifugal precipitation of the LED package, it is possible to prevent the tilting or overflow phenomenon that occurs before or after the centrifugal force is applied, as well as to control the undesirable disturbance of the completed phosphors. This can lead to the reliability of the production process.

In addition, since the structure for improving yield is simple and space utilization is improved, productivity will be improved and economical production structure will be provided.

In the above, the present invention has been described in detail based on the embodiment and the accompanying drawings. However, the scope of the present invention is not limited by the above embodiments and drawings, and the scope of the present invention will be limited only by the contents described in the claims below.

1000 ... Lead frame 1010 ...
2100 ... drum body 2110 ... rotary shaft
2200 holder part 2210 holder rib
2220 ... Rotator 2230 ... Holder Drive

Claims (5)

A drum body 2100 rotatable under the control of a drive motor; And
And a plurality of holder parts 2200 disposed circumferentially on the inner circumferential side of the drum body and having a holder driving part 2230 for mounting lead frames and adjusting an angle of the lead frame.
The holder driving unit,
At least in the driving process in which the lead frames are sequentially mounted on the holder part through the input part as the drum body is rotated at the circumferentially arranged interval of the holder part without horizontally aligning the lead frame. The holder part where the lead frame is already mounted is kept in a horizontal state.When the input of the lead frame is completed and centrifugal driving is started, the bottom of the holder part is adjacent to the inner circumferential side of the drum body so that the surface of each lead frame is perpendicular to the radial direction. And centrifugal sedimentation device for preventing the resin from tipping or overflowing by aligning the holder in a discharge driving process.
The method of claim 1,
The holder driving unit,
Phosphor centrifugal sedimentation apparatus for causing the lead frame to be rotated in the centrifugal direction gradually in the process until the centrifugal drive is started to reach the set rotation speed.
The method of claim 1,
The holder portion,
The holder is arranged to allow the body to rotate in the up and down direction with respect to the inner circumferential side of the drum body, and the rotating part 2220 provided on either side selected from both sides of the body, and to surround a part of the outer side and the upper surface of the lead frame. A phosphor centrifugal precipitation apparatus having ribs 2210.
The method of claim 3,
The holder rib,
A plurality of phosphor centrifugal sedimentation apparatus which is arranged in a plurality and inclined so that the interval facing toward the upper side becomes narrower so as to correspond to the width of the lead frame that is greater than the upper gap and less than the lower gap.
The method of claim 1,
The injection drive is,
Phosphor centrifuge for dividing half of the drum body in the circumferential direction and mounting the lead frames sequentially while rotating in the forward direction with respect to the holder portions disposed on one side, and sequentially mounting the lead frames while rotating in the reverse direction with respect to the holder portions arranged on the other side. Precipitation device.

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