KR102127600B1 - Precipitation apparatus for fluorescent material having centrifugal rail - Google Patents

Abstract

The present invention relates to an apparatus for manufacturing an LED package, and includes a transport unit (3000) in which one or more lead frames are seated, an input rail unit (2120) formed in a horizontal direction to provide a space for detaching the lead frame, A centrifugal rail including a centrifugal rail part 2110 that provides a circular transport path so that the transport part transferred from the input rail part can be moved in the circumferential direction and allows the phosphor on the lead frame to settle by centrifugal force Provided is a phosphor precipitation device.

Description

Phosphor sedimentation device with a centrifugal rail{PRECIPITATION APPARATUS FOR FLUORESCENT MATERIAL HAVING CENTRIFUGAL RAIL}

The present invention relates to the manufacture of LEDs, and more particularly, to improve the inefficiency of the centrifugal precipitation method, while reducing the settling time of the phosphor and to the phosphor settling apparatus to make the quality uniform.

Light-emitting diodes (hereinafter referred to as LEDs) are transformed from display light sources to LED light sources, and are expected to be next-generation energy-saving light sources, and are expected to replace incandescent lamps or fluorescent lamps in the future. Therefore, technological innovations in the field of white LED technology, semiconductor lighting or solid state lighting are actively being made in countries around the world.

The LED 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. These LEDs are provided in a predetermined package form to be applied according to various use purposes or processes.

U.S. Patent No. US6642652 discloses a method of manufacturing an LED in the past, and since the phosphor layer is formed on a top surface of a wafer on which a plurality of LEDs are formed, it is manufactured by cutting with individual chip sands, so the phosphor layer is a white light emitting diode It is evenly coated on the top and sides of the. However, this manufacturing method has a limitation in application because it can be applied only with a semiconductor pep manufacturing line.

Therefore, recently, a method of coating a phosphor in a final encapsulation process of a light emitting diode has been applied.

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

Looking at this in detail, the light emitting diode chip 100 is accommodated in the package body 120 to emit light, and the phosphor 131 is formed by sedimentation on the surface of the light emitting diode chip 100. The silicone encapsulant 132 is cured after being injected onto the light emitting diode chip 100 to surround the light emitting diode chip 100 and the phosphor 131.

In the manufacturing process of the light emitting diode chip, a color temperature and a 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 silicone 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 ), the step of passing a predetermined time at a predetermined temperature so that the phosphor 131 precipitates on the surface of the light emitting diode chip 100 is performed. Accordingly, when the phosphor 131 and the silicone encapsulant 132 are mixed to inject the slurry into the package body 120, the phosphor 131 due to the difference in specific gravity between the silicone encapsulant 132 and the phosphor 131 Is to precipitate on the surface of the light emitting diode chip 100.

Thereafter, the step of curing the silicone encapsulant 132 is performed to complete the light emitting diode of the present invention.

However, there is a problem in that it is quite difficult to obtain light of uniform color on the entire light emitting surface due to non-uniform spatial distribution of the phosphor powder dispersed in the phosphor molding portion or the phosphor layer, and this problem is caused by the white light emitting diode of this type. It acts as a barrier to penetration into the LCD BLU or projector market that requires high-performance specifications, and can also affect the reliability of LED devices.

The present invention has been devised to solve the above-mentioned problems, and aims to provide a precipitation device for a structurally simple phosphor while increasing productivity by dramatically improving the efficiency of a process for precipitation in the manufacturing process of LEDs. do.

The present invention, at least one lead frame 1000 is disposed transport unit 3000; An input rail part 2120 for providing a space in which the lead frame is detachably attached to the transport part while the transport part is horizontally disposed; And in the resin mixture of the light emitting diode chip disposed on the lead frame by providing a circular transport path to be connected to the input rail part and transported from the input rail part in a circumferential direction by applying a centrifugal force in the outer circumferential direction. A centrifugal rail portion (2110) that allows the phosphor to be precipitated.

Preferably, the input rail portion is connected in a tangential direction to the centrifugal rail portion on the front side.

In addition, it may be further disposed on the connecting portion of the input rail portion and the centrifugal rail portion may further include a selection unit 2130 to select a transport path for the inlet or the centrifugal movement of the transportation unit.

As an embodiment, the selector may connect or block the path of the centrifugal rail portion formed on the upper portion of the connecting portion of the input rail portion and the centrifugal rail portion.

On the other hand, the transport unit may be transported in the opposite direction to the input direction when the phosphor is precipitated by centrifugal force and transported to the input rail unit.

The transport part is preferably deformable in the vertical direction so that a plurality of lead frames are arranged in a straight direction on the input rail part while being seated at equal intervals in the longitudinal direction and circumferentially along the centrifugal rail part.

According to the above-described configuration of the present invention, since the time required for precipitation in the conventional LED package manufacturing process can be shortened and the precipitation efficiency can be maximized, the productivity of the manufacturing process of the LED package is improved.

In addition, the sedimentation devices using the conventional centrifugal separation have a complicated structure, and in particular, it is possible to prevent a tilting or overflowing phenomenon due to an inclination occurring in the lead frame inflow process, so that economical efficiency and quality reliability can be dramatically improved. Will be able to.

1 is a view showing a light emitting diode by a phosphor coating method of a conventional light emitting diode.
2 is a block diagram of a phosphor precipitation device having a centrifugal rail according to the present invention.
3 is a view showing a state in which the phosphor precipitation device having a centrifugal rail of the present invention drives the precipitation.
4 is a view for explaining a structure for selecting a rail portion in the phosphor precipitation device having a centrifugal rail according to an embodiment of the present invention.
Figure 5 is a flow chart for explaining the operation of the phosphor precipitation device having a centrifugal rail of the present invention.

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

In the following description, when a part is said to be'connected' to another part, this includes not only the case of being directly connected, but also the case of connecting another element or device in between. Also, when a part is said to'include' a certain component, this means that other components may be further included instead of excluding other components, unless otherwise stated.

In the present invention, by default, one or more lead frames are mounted on the transport unit, the input rail unit to provide a space where the lead frame can be detached, and the transport unit transferred from the input rail unit to be moved in the circumferential direction. Disclosed is a phosphor precipitation apparatus having a centrifugal rail including a centrifugal rail portion that provides a path through which the phosphor can be precipitated by centrifugal force.

The present invention is a centrifugal sedimentation method in order to reduce the time required for the precipitation process of the phosphor in the pre-step or curing process of dispensing and curing the material in the mixed state of the phosphor and the resin material such as epoxy or silicone on the LED chip. If applicable, it may also be considered to be formed integrally with the device for the dispensing process in some cases.

The lead frame applied in the present invention basically describes a case where a plurality of LED chips or packages are arranged as a main example, but a single or a plurality of LED packages or magazines are also included in the concept of the lead frame of the present invention. It should be understood to be.

2 is a block diagram of a phosphor precipitation device having a centrifugal rail according to the present invention.

The transport unit 3000 moves along the rail unit in a state in which one or more lead frames 1000 are disposed on the upper part, and moves for detachment of the lead frame 1000 while centrifugal sedimentation is performed through the centrifugal rail unit 2110. It can be rotated as possible.

Therefore, the transport unit 3000 may be configured to include a motor or a vehicle having magnetic force, and in some cases, devices for providing transport power of the transport unit 3000 may be provided on a rail unit to be described later. . As a configuration for moving the transport unit 3000, a known configuration for various devices moving along a rail may be applied.

The transport unit 3000 may have various lengths, widths, and shapes depending on selection. However, in view of the fact that the lead frame 1000 has a rectangular shape, it is preferable that the lead frame 1000 has a long rectangular shape. The transport unit 3000 may have a variable shape according to the shape of the rail unit, and for this purpose, a shape may be changed in the vertical direction with a hinge or a flexible material such as a belt.

One or more lead frames 1000 may be arranged in the transport part 3000 in the longitudinal direction, and may be provided with predetermined holder parts (not shown) so that the lead frame 1000 does not deviate during transport or centrifugal sedimentation. Can. The holder parts may have various shapes, such as clips, slits, and hooks, if the position of the lead frame 1000 can be fixed.

The rail unit to which the transport unit 3000 is transported may have two major structures, and is formed in a horizontal direction so that the lead frames 1000 can be detached while the transport unit 3000 is disposed in the horizontal direction. It is composed of an input rail part (2120) for providing, and a centrifugal rail part (2110) connected to the input rail part (2120), made of a cylindrical or ring shape, and allowing the transportation part (3000) to move circularly along the inner circumference. .

Such a rail part may consider two rail types for guiding movement on the outer side of the wheel, as well as a monorail type.

The input rail portion 2120 is formed in a horizontal direction, the length of which is preferably made of at least the length of the transport unit 3000 having a length such that the arrangement of the plurality of lead frames 1000 is acceptable. will be.

Considering that the intervals of the lead frames 1000 on the transport part 3000 disposed on the input rail part 2120 are circumferentially arranged on the centrifugal rail part 2110, it is preferable that they are equally spaced.

The cylindrical or ring-shaped centrifugal rail part 2110 connected to one end of the input rail part 2120 may be formed with the same radius based on a predetermined virtual central axis, and the transport part 3000 may be provided on its inner circumferential side. As it is transferred along the circumferential direction, centrifugal force in the outer circumferential direction is applied to the lead frame 1000. Therefore, the lead frames 1000 are moved relative to the inner circumferential side of the centrifugal rail part 2110 so that phosphors are precipitated according to the centrifugal force for chips that are not cured.

The input rail part 2120 is contacted in the tangential direction of the centrifugal rail part 2110, and an embodiment related to this coupling relationship will be described later.

3 is a view showing a state in which the phosphor precipitation device having a centrifugal rail of the present invention drives the precipitation.

In the case of FIG. 2, the transport frame 3000 is disposed on the input rail part 2120 so that the lead frames 1000 can be detached, whereas the case of FIG. 3 shows a case of moving to receive centrifugal force.

It should be noted that, while the transport part 3000 located in the input rail part 2120 is formed in a straight line in a horizontal state, when disposed in the centrifugal rail part 2110, it has a substantially circular or arc shape depending on its inner circumferential shape. do.

The speed of the transportation unit 3000 in the centrifugal rail unit 2110 is a factor for determining the centrifugal force, and accordingly, the centrifugal force for sedimentation of the phosphor is controlled under the control of the driving system (not shown) of the transportation unit 3000 I can do it.

That is, the transfer power of the transport unit 3000 is converted to a rotational motion to apply a centrifugal force, and the centrifugal force may cause the transport unit 3000 and the lead frame 1000 to be more closely adhered to the inner circumferential side of the centrifugal rail unit 2110. Contribute to help.

Conventionally, there are cases of centrifugal sedimentation by rotating the drum while the lead frames are fixed to the inner peripheral side of the rotating drum. However, in this case, except for the lead frame (or LED chip) located in the normal direction with respect to the central axis, the rest of the portion has a slope with respect to gravity. This causes the resin material and the phosphor to be unidirectional in a fixed state or a low rotational force, and may cause overflow in some cases. This leads to defective LED chips. In particular, a serious problem is caused when the width of the resin material is wider than the depth in the LED chip.

It should be noted that, in the present invention, such problems can be solved by default because the lead frame 1000 is drawn in and out and arranged in the circumferential direction only when centrifugal force is applied.

4 is a view for explaining a structure for selecting a rail portion in a phosphor precipitation apparatus having a centrifugal rail according to an embodiment of the present invention.

The input rail part 2120 and the centrifugal rail part 2110 as described above function respectively for detachment of the lead frame 1000 and for providing centrifugal force of the lead frame 1000, for this purpose, of the transport part 3000 There is a need to select a transport path.

That is, immediately after the input of the transportation unit 3000 from the input rail portion 2120 to the centrifugal rail portion 2110 is completed, the path of the centrifugal rail portion 2110 is closed to continuously repeat the rotational movement along the circumferential direction. After the completion of the provision of the centrifugal force, the transportation part 3000 must be discharged from the centrifugal rail part 2110 to the input rail part 2120 again.

To this end, between the connecting portions of the input rail part 2120 and the centrifugal rail part 2110, a selection part 2130 for selecting a path may be provided, and various configurations for selecting two or more rail paths may be applied. Will be able to.

Here, the connecting portion (t) of the input rail portion 2120 and the centrifugal rail portion 2110 may be a point where a portion of a straight rail end and a portion of a circumferential rail contact each other. Therefore, the input rail part 2120 has a tangential form of the centrifugal rail part 2110. Here, the tangential shape means when viewed from the front.

A selection unit 2130 may be disposed to partially open and close a section of the centrifugal rail unit 2110 at a part of the point where the input rail unit 2120 meets. In an embodiment of the present invention, the selector 2130 is disposed to open and close the upper space in which the connecting portion t of the centrifugal rail part 2110 is disposed, and the selector 2130 is a space for opening and closing. By disconnecting the connection so that the transport unit 3000 is drawn in and out from the centrifugal rail unit 2110, it is connected to perform centrifugal motion.

Therefore, the selection part 2130 may be rotatably coupled to the end of the centrifugal rail part 2110 in a space above the connecting part, and the form thereof is an arc having the same radius as the centrifugal rail part 2110. It could be done. The opening/closing operation of the selection unit 2130 is connected to a control unit (not shown) capable of controlling the operation of the transportation unit 3000, and through a control signal to the opening/closing driving unit (not shown), a pull-in mode, a draw-out mode or a centrifugal motion Depending on the selection of the mode, it will be possible to open and close the draw-out space appropriately.

Based on the illustrated state, referring to FIGS. 2 to 3, as the transport unit 3000 is moved in the right direction from the input rail unit 2120, the input into the withdrawal space is completed, and the transport unit 3000 is centrifuged. While starting the circumferential movement along the rail portion 2110, the selection portion 2130 closes the inlet/out space to form a complete circumferential rail to each chip according to the counterclockwise movement of the transport portion 3000. Centrifugal force is applied. The speed of the transport unit 3000 is related to the number of revolutions of the transport unit 3000 along the centrifugal rail unit 2110, which can be selected according to the degree of centrifugal force.

When the centrifugal sedimentation process is completed according to a predetermined set time, the transportation unit 3000 is reversed, that is, transferred in a clockwise direction, and the selection unit 2130 opens the withdrawal space to be discharged to the input rail unit 2120 again. . The lead frame 1000 may be detached while repeating this process, and a process related thereto will be described later.

However, the selection unit 2130 is an example for selecting a path of the input rail unit 2120 and the centrifugal rail unit 2110, and in some cases, the input rail unit 2120 and the centrifugal rail unit 2110 may be placed on the side. It may also be considered to be placed in an eccentric position.

Figure 5 is a flow chart for explaining the operation of the phosphor precipitation device having a centrifugal rail of the present invention.

When the transport frame 3000 is disposed on the input rail part 2120 and the lead frames 1000 are mounted and aligned so that the input rail part seating step (S100) is performed, the selection part 2130 opens the withdrawal space In one state, as the transport unit 3000 is transferred to the centrifugal rail unit 2110, the centrifugal rail unit transfer step S110 is completed. Here, the completion of the transfer of the centrifugal rail portion means that the end of the lead frame 1000 is completely separated from the input rail portion 2120 and is disposed on the circumference of the centrifugal rail portion 2110.

Thereafter, the selection unit 2130 closes the inlet/outlet space to form a centrifugal path closing (S200) step of forming a path in a completely circular manner to the centrifugal rail unit 2110, and the transport unit 3000 is the centrifugal rail unit 2110 Centrifugal precipitation step (S210) is performed while moving at a selected speed. Here, it is preferable to prevent undesired tilting or overflow of the resin material, etc., that there is no time interval or minimized between the completion of the transfer on the centrifugal rail part 2110 of the transport part 3000 and the rotational motion for centrifugal precipitation. .

In the step of determining whether sedimentation is completed (S220), a determination is made through a predetermined control unit as to whether or not the set time has elapsed. When the sedimentation is not completed, the transportation unit 3000 uses the centrifugal rail unit 2110. It will continue to rotate. However, the determination through the control unit may be made from other factors other than time, and in some cases, it may be made by manual manipulation by the user.

When it is determined that the precipitation is complete, the opening and closing spaces of the centrifugal path are performed (S300) by opening the inlet/outlet space through the selector 2130, and the transport unit 3000 is opposite to the movement direction for the inlet and centrifugal motion. As it is transferred, the reverse and discharge steps (S310) are completed. It will be desirable to minimize the time interval between the completion of precipitation and the discharge, as in the case of inlet.

As described above, the centrifugal sedimentation is completed on the input rail part 2120 and the discharged lead frames 1000 are replaced with the lead frame 1000 through a centrifugal sedimentation process again, and the above process may be repeated.

In some cases, in the process of the centrifugal precipitation step (S210), curing may be performed simultaneously through a heating means (not shown) in a process in which centrifugal force is applied.

According to the phosphor precipitation device having a centrifugal rail according to the present invention described above, the time required for precipitation in the conventional LED package manufacturing process can be shortened and the precipitation efficiency can be maximized, so that the productivity of the manufacturing process of the LED package is improved. There is this.

In addition, the conventional centrifugal sedimentation apparatuses are not only complicated in structure, but also can prevent a tilting phenomenon or overflow due to inclination occurring in the inflow process, so that economic efficiency and reliability of quality can be dramatically improved.

In the above, the present invention has been described in detail on the basis of examples and 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 2110...Centrifugal rail part
2120... input rail section 2130...selection section
3000...

Claims (5)

A phosphor precipitation device that provides centrifugal force in the process of phosphor precipitation in a mixture of resin and phosphor on a light emitting diode chip,
A transportation unit 3000 in which one or more lead frames 1000 on which light emitting diode chips are mounted are disposed;
A centrifugal rail portion 2110 that allows the phosphor to settle in the outer circumferential direction by providing a circular conveying path so that the transport portion can be moved in the circumferential direction and applying a centrifugal force in the outer circumferential direction;
Phosphor sedimentation apparatus having a centrifugal rail comprising; an input rail part 2120, which is connected to the centrifugal rail part to allow the transport part to be introduced into the centrifugal rail part.
According to claim 1,
The input rail portion,
Phosphor sedimentation apparatus having a centrifugal rail once connected in a tangential direction of the centrifugal rail part.
According to claim 2,
It is disposed on the connecting portion of the input rail portion and the centrifugal rail portion, a selection unit (2130) for selecting a transport path for the inlet or the centrifugal movement of the transportation unit;
The selector,
Phosphor sedimentation apparatus having a centrifugal rail to close or open the path of the centrifugal rail portion formed on the connecting portion of the input rail portion and the centrifugal rail portion.
According to claim 2,
The transport unit,
When the phosphor is precipitated by centrifugal force, the phosphor precipitation device having a centrifugal rail that is transferred in the opposite direction to the input direction and is conveyed to the input rail section.
According to claim 1,
The transport unit,
Phosphor sedimentation apparatus having a centrifugal rail that is deformable in the vertical direction so that a plurality of lead frames are arranged in a straight direction on the input rail part in a state in which the lead frames are seated at equal intervals in the longitudinal direction and can be arranged in a columnar shape along the centrifugal rail part.

Images