KR102183182B1 - LED array light source device with improved luminous efficiency - Google Patents

Abstract

According to the present invention, an LED array light source device with improved luminous efficiency includes: a first and second substrate comprising an LED array on which a plurality of LEDs are mounted, wherein the LED arrays are disposed to face each other; and a transparent body which is made of a transparent material and positioned between the first and second substrates in contact with the LED array, and extends along the extending direction of the first and second substrates. According to the present invention, the transparent body is disposed between the LED substrates facing each other, and light emitted from the first and second substrates can be concentrated on the transparent body, thereby reducing the loss of light of the LED and improving light emission output and uniformity. Thus, the luminous efficiency can be improved.

Description

LED array light source device with improved luminous efficiency}

The present invention relates to an LED array light source device with improved luminous efficiency, and more specifically, a transparent body exists between LED substrates facing each other, and light emitted from the first and second substrates can be concentrated to the transparent body, The present invention relates to an LED array light source device capable of improving luminous efficiency by improving light emission output and uniformity while reducing the loss of light of light.

First, a light emitting diode (LED) refers to a semiconductor made of Ga (gallium), P (phosphorus), and As (arsenic) as a light emitting diode.

These LEDs are made of PN junction diodes made by bonding N-type semiconductors with many electrons and P-type semiconductors with many positive holes. When a negative voltage is applied to the N-type semiconductor from the outside and a positive voltage is applied to the P-type semiconductor, The electrons of the N-type semiconductor move toward the P-type semiconductor and emit light through the principle of recombining with the holes of the P-type semiconductor.

At this time. The luminous efficiency is a luminous flux per unit electric power, which is an index of how bright a lighting device can brighten with a constant energy, and lighting devices including LEDs require high luminous efficiency.

At this time, Korean Patent No. 10-1949288 (name of invention: LED luminaire with improved luminous efficiency and a manufacturing method thereof) has been registered as a prior art related to luminous efficiency of LED lighting equipment.

In the prior art, a plurality of LEDs are configured at regular intervals on one surface of a circuit board mounted in a luminaire; A reflective sheet for reflecting light emitted from the plurality of LEDs is adhered to the circuit board; Each of the plurality of LEDs includes a plurality of diffusing lenses for diffusing light, and the reflective sheet is cut in advance with the installation portions of the plurality of LEDs and the installation portions of the plurality of diffusion lenses, and the plurality of diffusion lenses are absorbers. Thus, six diffusion lenses are adsorbed to the circuit board at a time, and the diffusion lens has an LED insertion groove into which an LED can be inserted, and a leg portion for mounting on the circuit board is formed around the LED insertion groove in a plurality of locations. And a display portion of the lens installation portion to which an adhesive is applied is formed on the circuit board corresponding to the leg portion of the diffusion lens, and the display portion of the lens installation portion is formed with a semicircular groove to accommodate the adhesive and insert and seat the leg portion. And, a reflective coating layer is sprayed on the bottom surface of the diffusing lens by spraying so that the diffused light is reflected, and the reflective coating layer is made of a mixed composition of nanosilver powder, unsaturated polyester resin, fine Teflon powder, and carboxyvinyl polymer, The reflective sheet and the diffusion lens provide an LED luminaire with improved luminous efficiency, which is mounted on the circuit board in close contact with each other.

The prior art maintains a constant luminous efficiency while reducing the number of LEDs per unit area by increasing the diffusion efficiency of light generated from the LED. However, since the LED light is not concentrated, light may be lost, requiring high light source efficiency. There is a problem that it is difficult to apply to technology.

Therefore, in order to solve this problem, the light emitted from the first and second substrates can be concentrated to the transparent material, reducing the loss of light from the LED and improving the luminous output and uniformity, thereby improving luminous efficiency. There is a need to develop an LED array light source device.

The present invention has been devised to overcome the problems of the above technology, and provides an LED array light source device in which light emitted from the first and second substrates can be concentrated to the transparent body by the presence of a transparent body between the LED substrates facing each other. It is the main purpose.

Another object of the present invention is to provide an LED array light source device in which a filtering film made of a transparent and translucent material is positioned between an LED array and a transparent body.

Another object of the present invention is to provide an LED array light source device in which a reflector is mounted at one end of a transparent body.

A further object of the present invention is to provide an LED array light source device having a transparent body including Ce: YAG (Cerium Doped YAG (yttrium aluminum garnet) Crystal).

In order to achieve the above object, the LED array light source device having improved luminous efficiency according to the present invention includes an LED array on which a plurality of LEDs are mounted, the first and second substrates disposed so that the LED arrays face each other; And a transparent body made of a transparent material, which is positioned between the first and second substrates in contact with the LED array and extends along the extending direction of the first and second substrates.

In addition, a filtering film made of any one of a transparent material and a translucent material is positioned between the LED array and the transparent material.

In addition, the transparent body is characterized in that it is made of at least one of a rod shape and a U shape extended to a predetermined length.

Further, a reflector is mounted at one end of the transparent body.

According to the LED array light source device having improved luminous efficiency according to the present invention,

1) Since there is a transparent body between the LED substrates facing each other, the light emitted from the first and second substrates can be concentrated to the transparent body, reducing the loss of light from the LED and improving the luminous output and uniformity to improve luminous efficiency. Can be improved,

2) A filtering film, which is a transparent and semi-transparent material, is positioned between the LED array and the transparent body to filter the light emitted from the LED array and at the same time play a role of physically protecting the LED.

3) A reflector is mounted at one end of the transparent body to reflect the light emitted from the LED so that the light can be concentrated to one point.

4) A transparent body containing Ce:YAG (Cerium Doped YAG (yttrium aluminum garnet) Crystal) can be used in combination with blue light to produce white light, and when blue light is emitted from an LED, Ce: It can be made into white light through YAG and emit light.

1 is a plan view showing an LED array light source device of the present invention.
Figure 2 is a side view of Figure 1;
3 is a conceptual diagram showing an embodiment in which a reflector is mounted on the LED array light source device of the present invention.
Figure 4 is a conceptual diagram showing a method of manufacturing the coating agent of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The accompanying drawings are not drawn to scale, and the same reference numerals in each drawing refer to the same elements.

1 is a plan view showing an LED array light source device of the present invention, and FIG. 2 is a side view of FIG. 1.

In the LED array light source device 10 with improved luminous efficiency of the present invention, a transparent body 130 exists between the LED substrates 110 and 111 facing each other, and light is emitted from the first and second substrates 110 and 111. Since the generated light can be concentrated to the transparent body 130, light loss of the LED 121 can be reduced, and light emission output and uniformity can be improved, thereby improving luminous efficiency.

The LED array light source device 10 of the present invention may also be used as a general lighting device, but may be applied to detection, inspection, and projectors that require high light source efficiency.

Referring to FIGS. 1 and 2, the LED array light source device 10 of the present invention basically includes first and second substrates 110 and 111 and a transparent body 130.

The first and second substrates 110 and 111 include an LED array 120 on which a plurality of LEDs 121 are mounted, and the LED arrays 120 are disposed to face each other.

The LED 121 is a type of semiconductor used to send and receive signals by converting an electric signal into infrared or light using the characteristics of a compound semiconductor, and has a characteristic of having a longer lifespan and a faster response speed than a light bulb.

Here, the first and second substrates 110 and 111 basically include the LED array 120, but a substrate made of a material such as copper, epoxy, or phenol resin, a power supply supplying power to the substrate, and an LED attached to the substrate. Configurations such as a reflecting unit for reflecting light and a control unit for controlling driving of the substrate may be included, and since this is a technology of a known LED substrate, a detailed description will be omitted.

At this time, the shapes of the first and second substrates 110 and 111 may be made differently depending on the technology to which the LED array light source device 10 of the present invention is applied, and specifically, various shapes such as a garden, an oval, a square, and a rectangle It may be made in size and length, and in consideration of durability and ease of storage of the LED array light source device 10 of the present invention, the first and second substrates 110 and 111 may have an appropriate thickness. Additionally, the material, shape, size, and the number of mounted LEDs 121 of the first and second substrates 110 and 111 may all be the same, but may be set differently according to circumstances.

The transparent body 130 is made of a transparent material, and is positioned between the first and second substrates 110 and 111 described above in a state in contact with the LED array 120 so as to extend the direction of the first and second substrates 110 and 111. Can be extended accordingly.

That is, as shown in FIGS. 1 and 2, it may be formed to have a length corresponding to the length of the first and second substrates 110 and 111, and the light emitted from the first and second substrates 110 and 111 can be concentrated. It is desirable to have a suitable thickness for it because it provides a place to be able to.

In this case, the material of the transparent body 130 may be made of Ce: YAG (Cerium Doped YAG (yttrium aluminum garnet) Crystal), translucent alumina, translucent PLZT, or the like, and there is no specific limitation thereon.

The LED array light source device 10 of the present invention having such a configuration has a structure in which light emitted from the LED array 120 of the first and second substrates 110 and 111 can be concentrated to a transparent material, thereby providing excellent luminous efficiency. Can be implemented.

In addition, a filtering film 140 is positioned between the LED array 120 and the transparent body 130 to filter light emitted from the LED array 120.

Specifically, a total of two filtering films 140 are positioned between the LED array 120 of the first substrate 110 and the transparent body 130, and between the LED array 120 of the second substrate 111 and the transparent body 130 The first and second substrates 110 and 111 and the transparent body 130 may have a length and size corresponding to each other.

The filtering film 140 may be made of any one of a transparent material and a translucent material, and may be made of a transparent ceramic, plastic, or the like, which is a material capable of passing light from the LED array 120. In addition, the thickness of the filtering film 140 is preferably formed to a level that does not reduce the light efficiency of the LED array 120.

The filtering film 140 may perform a role of filtering light emitted from the LED array 120 and physically protecting the LED 121. In addition, the filtering film 140 may be made of a material such as a known optical filter, if necessary, and may provide a function of filtering or absorbing light of a specific wavelength from light, and accordingly, a color different from the color of light emitted from the LED 121 Color light may be emitted.

As another embodiment, the transparent body 130 may be formed of at least one of a rod shape and a U shape extending to a predetermined length. That is, the transparent body 130 may have a rod shape as shown in FIG. 1, but may have a U shape.

At this time, when the transparent body 130 is in the shape of a rod, both ends of the transparent body 130 exist in opposite directions, but when the transparent body 130 has a U shape, both ends of the transparent body are located in the same direction. At the same time, since light emits light, the luminous efficiency can be further increased.

3 is a conceptual diagram showing an embodiment in which a reflector is mounted on the LED array light source device of the present invention.

As another embodiment, as shown in FIG. 3, a reflector 150 is mounted at one end of the transparent body 130 to reflect light emitted from the LED 121 to focus the light to one point.

Here, the size of the reflector 150 may be made to have a size corresponding to the size of the cross-section of the transparent body 130, and may be fixed to one end of the transparent body 130 or be fluidly installed when necessary. Specifically, the reflector 150 may be a generally used mirror having a reflective property.

At this time, due to the installation of the reflector 150, light in the transparent body 130 may be concentrated to the opposite end of the reflector, and thus the intensity and efficiency of the light may be further increased.

As another embodiment, the transparent body 130 may include Ce: YAG (Cerium Doped YAG (yttrium aluminum garnet) Crystal),

Here, inclusion means that the transparent body 130 itself is made of the above-described material, is present in mixture with other materials, or that other materials are coated on the surface of the above-described material. For example, the transparent body 130 is basically made of Ce: YAG (Cerium Doped YAG (yttrium aluminum garnet) Crystal), and may have a shape in which a coating agent made of another material is coated on the surface.

Here, the term Ce:YAG means cerium doped with YAG and serves as a phosphor. In this case, the phosphor refers to a material that emits light by absorbing relatively high energy light such as ultraviolet rays or visible rays, that is, emitting light.

Specifically, cerium refers to a ductile silvery-white metal, and YAG (yttrium aluminitum garnet) refers to a crystal composed of three types of yttrium, aluminum, and garnet. It is used as a phosphor for cathode ray tubes and white light-emitting diodes. It is the material used.

Such Ce:YAG emits yellow light and can be used to produce white light most widely by combining with blue light, and when blue light is emitted from an LED, it may be produced as white light through Ce:YAG in a transparent body to emit light. The white light generated in this way has a high color temperature and low color rendering property, and a red phosphor is also mixed and used to improve color rendering.

4 is a conceptual diagram showing a method of manufacturing the coating agent of the present invention.

In addition, the transparent body 130 is dried for 20 to 40 minutes at 70 to 90 °C after a coating agent including sodium carboxy methyl cellulose (CMC) and sodium dodecyl sulfate is applied on the surface to form a coating film. As can be seen, due to the high transmittance of the coating film, structural stability is excellent without interfering with light irradiation, so that the transparent body 130 may be physically protected.

At this time, the coating agent may be applied through a spray, a roller, or the like, and there is no specific limitation thereon.

Such a coating agent may be manufactured through a first material manufacturing step (S100), a second material manufacturing step (S110), and a coating agent completion step (S120).

First, the first material manufacturing step (S100) is water 50 to 70 parts by weight, sodium dodecyl sulfate (sodium dodecyl sulfate) 30 to 55 parts by weight, CMC (sodium carboxy methyl cellulose) 20 to 45 parts by weight, EDOT (3,4) -Ethylenedioxythiophene) is a process of preparing a primary material by mixing 5 to 15 parts by weight.

Here, it is preferable to use ultrapure water from which ions in water have been removed. At this time, sodium dodecyl sulfate is a kind of surfactant and plays a role as a dispersant in this process. In addition, CMC serves as a polymeric binder and thickener, assists in physical bonding of the primary material and materials to be added through a process to be described later, and may improve the viscosity of the coating agent. In addition, EDOT is a material that has excellent transparency and flexibility and can help to improve the structural stability of the material.

Next, in the second material manufacturing step (S110), 75 to 90 parts by weight of the primary material, 10 to 35 parts by weight of carbon nanotubes (CNT), and 5 to 25 parts by weight of HPMC (hydroxy propyl methyl cellulose) are mixed, and then ultrasonic waves are applied. It is a process of manufacturing a secondary material.

Here, carbon nanotubes are materials having excellent electrical, thermal, and mechanical properties, and are contained in a coating agent to help improve durability of the transparent body. In addition, HPMC may be helpful in improving the viscosity of the coating agent, and adhesion ability may be improved by improving the viscosity of the coating agent. At this time, the ultrasound is performed for uniform dispersion of CNTs in the secondary material, and the ultrasound may be scanned using a separate ultrasound providing equipment, and the ultrasound injection is preferably performed for 1 to 6 hours.

Finally, in the coating agent completion step (S120), the secondary material is centrifuged and the upper layer solution is extracted to complete the coating agent.

At this time, the centrifugal separation is preferably performed for 1 to 5 hours at a speed of 900 to 1100 rpm.

Here, when the secondary material is centrifuged, the secondary material is divided into an upper layer and a lower layer by centrifugal force, and the upper layer may be a finished coating agent.

The coating agent prepared through this process has excellent structural stability and is strong and is applied to the transparent body 130 to effectively improve the durability of the transparent body.
As described so far, the LED array light source device having improved luminous efficiency according to the present invention has been expressed in the above description and drawings, but these are only described as examples, and the spirit of the present invention is not limited to the above description and drawings. It goes without saying that various changes and changes are possible within the scope of the technical idea of the invention.

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10: LED array light source device 110: first substrate
111: second substrate 120: LED array
121: LED 130: transparent
140: filtering film 150: reflector
S100: primary material manufacturing step S110: secondary material manufacturing step
S120: Coating agent completion stage

Claims (10)

As an LED array light source device with improved luminous efficiency,
A first and second substrate comprising an LED array on which a plurality of LEDs are mounted, wherein the LED arrays are disposed to face each other;
Including; positioned between the first and second substrates in a state in contact with the LED array and extending along the extension direction of the first and second substrates, the transparent body made of a transparent material;
The transparent body,
In the state containing Ce:YAG (Cerium Doped YAG (yttrium aluminum garnet) Crystal),
LED array, characterized in that a coating film is formed by drying at 70 to 90°C for 20 to 40 minutes after a coating agent containing CMC (sodium carboxy methyl cellulose) and sodium dodecyl sulfate is applied to the surface. Light source device. The method of claim 1,
Between the LED array and the transparent body,
The LED array light source device, characterized in that the filtering film made of any one of a transparent material and a translucent material is positioned. The method of claim 1,
The transparent body,
LED array light source device, characterized in that consisting of at least one of a bar shape and a U shape extended to a predetermined length. The method of claim 1,
At one end of the transparent body,
An LED array light source device, characterized in that a reflector is mounted. The method of claim 1,
The coating agent,
A primary material was prepared by mixing 50 to 70 parts by weight of water, 30 to 55 parts by weight of sodium dodecyl sulfate, 20 to 45 parts by weight of sodium carboxy methyl cellulose (CMC), and 5 to 15 parts by weight of EDOT (Ethylenedioxythiophene). Step to do;
Mixing 75 to 90 parts by weight of the primary material, 10 to 35 parts by weight of carbon nanotubes (CNT), and 5 to 25 parts by weight of hydroxy propyl methyl cellulose (HPMC), and then applying ultrasonic waves to prepare a secondary material;
After centrifuging the secondary material, extracting the upper layer solution to complete the coating agent; characterized in that produced through the LED array light source device. delete delete delete delete delete

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