KR101026670B1 - Lens structure and and led lighting device using the same - Google Patents

Abstract

PURPOSE: A lens structure and an LED lamp using the same are provided to improve luminous efficiency by reflecting light from the side to the front. CONSTITUTION: A rear groove(111) is formed in the center of a lens(110). A lens case(120) receives the lens in a receiving groove(121). A reflection coating layer made of mixture of aluminum, titanium, and amine-based cross linker is formed in the receiving groove and reflects light from the side of the lens to the front. A support unit(124) is extended from the rear of the receiving groove. The end of the support unit has the same height as three leads(122).

Description

LENS STRUCTURE AND AND LED LIGHTING DEVICE USING THE SAME}

The present invention relates to an LED lighting device using a light emitting diode (LED) as a light source, and more particularly has a structure that can cover the LED chip in a stable manner, by reflecting the light emitted from the side to the front to improve the luminous efficiency It relates to a lens structure and an LED lighting device using the same that can be improved.

Common light bulbs used for lighting include fluorescent, incandescent or industrial neon lamps, most of which are gas discharge tube configurations in which gas is injected into a glass tube.

In the case of the general light bulbs described above, it may be the cause of air pollution when the gas leaks due to the burnout of the glass tube, and when the brightness is to be brightened, the power consumption increases accordingly, and power line construction must be performed accordingly, so There were problems such as excessive maintenance costs.

On the other hand, as an alternative to solve the problem of the above-mentioned bulbs, in recent years, the development of a luminaire using a low power consumption LED has been proposed. In the case of the LED luminaire, by applying an LED chip having high brightness and long life, Intense light emission is possible together.

However, in the case of the LED lighting fixture, there is a problem that the straightness of the individual LED is degraded because the LED is a point light source, and a lot of heat is generated when driving the LED, it can lead to degradation of the LED chip.

An object of the present invention can stably cover the LED chip mounted on a metal printed circuit board (Metal Printed Circuit Board), a lens structure that can improve the luminous efficiency by reflecting the light emitted from the side toward the front To provide.

Another object of the present invention is to provide an LED lighting device to which the lens structure is applied.

Lens structure according to an embodiment of the present invention for achieving the above object is a tapered shape that is larger in diameter toward the front side, the rear groove is formed in the center of the rear surface, the diffusion surface is formed on the lens ; And a lens case formed of a plastic material having an accommodating groove corresponding to the lens shape to accommodate the lens in the accommodating groove, and having three leads formed in a rear direction from a front edge thereof. The inner surface of the receiving groove is formed with a reflective coating layer made of a mixture of 70 to 80% by weight of aluminum, 15 to 20% by weight of titanium and 5 to 10% by weight of an amine-based crosslinking agent to reflect light emitted from the side of the lens toward the front side. It is characterized by.

LED lighting apparatus according to an embodiment of the present invention for achieving the another object is a metal printed circuit board (Metal Printed Circuit Board); A plurality of LED chips (Light Emitting Diode Chip) chips mounted on the front surface of the printed circuit board by soldering; A plurality of lens coupling protrusions formed three at regular intervals from a center of each of the plurality of LED chips; A plurality of cover coupling protrusions formed at edges of the front surface of the printed circuit board and having screw grooves formed therein; A plurality of lens structures covering each of the plurality of LED chips and condensing and diffusing light emitted from the plurality of LED chips; And a plurality of holes formed to expose the front surface of each of the plurality of lens structures, and a screw hole formed at an edge thereof, the cover plate being made of a metal material to be screwed to the cover coupling protrusion. Each of them has a tapered shape that increases in diameter toward the front side, and a rear groove is formed so that the LED chip is located at the center of the rear surface, a lens having a diffusion surface formed on the front surface, and a receiving groove corresponding to the lens shape. Is formed to accommodate the lens inside the receiving groove, three leads are formed in the rear direction from the front edge to be fitted to the three lens coupling projections, 70 to 80% by weight of aluminum on the inner surface of the receiving groove, A lens case having a reflective coating layer formed of a material in which 15 to 20 wt% of titanium and 5 to 10 wt% of an amine crosslinking agent are mixed. It characterized in that it comprises a switch.

At this time, the LED lighting apparatus according to the present invention is further coupled to the back of the printed circuit board, further comprising a heat dissipation sheet for dissipating heat generated by the LED chip to the rear side, or is coupled to the back of the heat dissipation sheet, The surface in contact with the heat dissipation sheet may further include a cold and warm elements that the opposite side is heated.

The lens structure according to the present invention can stably cover the LED chip. In addition, the lens structure according to the present invention can improve the luminous efficiency by reflecting the light emitted from the side of the lens toward the front surface by forming a reflection coating layer without using chromium in the lens case.

In addition, the LED lighting device applying the lens structure according to the present invention can exhibit a high luminous efficiency, it can exhibit a high heat dissipation effect through the heat dissipation sheet and the cold temperature element.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only the embodiments make the disclosure of the present invention complete, and those skilled in the art to which the present invention pertains. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, a lens structure and an LED lighting apparatus using the same according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exploded perspective view of a lens structure according to the present invention, FIG. 2 is a vertical sectional view of the lens structure shown in FIG. 1, and FIG. 3 is a combined perspective view of the lens structure shown in FIG. 1.

1 to 3, the illustrated lens structure 100 collects and diffuses light emitted from an LED chip, and includes a lens 110 and a lens case 120.

The lens 110 has a taper shape in which the diameter thereof becomes larger toward the front side. In addition, the rear groove 111 is formed in the center portion of the rear surface of the lens 110, the diffusion surface 112 is formed on the front surface.

Here, the front surface refers to the surface in the direction in which light is emitted from the LED chip, the rear surface refers to the opposite surface.

The LED chip is positioned inside the rear groove 111 formed at the center of the rear surface of the lens 110, and the diffusion surface 112 formed on the front surface of the lens 110 is formed in a fine concavo-convex pattern and is emitted from the LED chip. 110 serves to diffuse the light collected through the interior.

The lens case 120 has a receiving groove 121 corresponding to the shape of the lens 110. The lens 110 is accommodated in the accommodation groove 121, and for this purpose, the shape of the accommodation groove 121 formed in the lens case 120 has a tapered shape similarly to the shape of the lens 110. A through hole is formed in the bottom surface of the receiving groove 121 of the lens case 120 so that the LED chip may be located in the rear groove 111 of the lens 110. The LED chip protrudes to the front through the through hole, the LED chip is located in the back groove 111 of the lens 110.

The size of the accommodating groove 121 of the lens case 120 is preferably equal to or slightly larger than the size of the lens 120 so that the lens 110 is not separated from the front direction when the lens 110 is accommodated.

Meanwhile, referring to FIG. 1, the lens case 120 has three leads 122 formed in a rear direction from a front edge thereof. The three leads 122 are for mounting the lens structure 100 according to the present invention on the front surface of the printed circuit board in the form of covering the LED chip.

If no leads are formed in the lens case 120 or only one or two leads are present, the lens structure 100 is difficult to stably rest on the front of the printed circuit board, and if there are four or more leads, the front of the printed circuit board Although stable mounting is possible, the cost of manufacturing the lens case also increases as the number of leads increases, so it is desirable to form three leads.

In addition, the support part 124 may be extended from the rear surface of the receiving groove 121 in the lens case 120 to cover the side portion of the LED chip, and to serve as a lower support of the lens structure 100. At this time, the ends of the support 124 has the same height as the three leads 122.

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The lens case 120 may be formed of a metal material, but may be formed of a conventional plastic material such as polyvinyl chloride (PVC) or polyethylene terephthalate (PET), which is relatively light and can be manufactured at low cost.

Meanwhile, in the present invention, a reflective coating layer is formed on an inner surface of the receiving groove 121 of the lens case 120. The reflective coating layer is formed to reflect the light emitted to the side of the lens 110 to the front to improve the luminous efficiency.

As is well known, the reflective coating layer may be formed by plating chromium (Cr) having a reflectance of about 50% on visible wavelengths, but chromium is a harmful material to the environment. Therefore, in order to obtain a high reflectance without using the chromium, in the present invention, a material containing 70 to 80% by weight of aluminum, 15 to 20% by weight of titanium and 5 to 10% by weight of an amine crosslinking agent is used as the reflective coating layer. It was. As a result, it can be seen that the reflective coating layer applied to the present invention exhibits higher reflectance than the chromium-based reflective coating layer.

In order to evaluate the reflectance of the reflective coating layer, the following experiment was performed.

1. Preparation of Specimen

Example  One

On the PVC film (manufactured by Asung Chemical Co., Ltd.) having a thickness of 2 mm, a specimen on which a reflective coating layer made of 70 g of aluminum, 20 g of titanium, and 10 g of bis (3-aminopropyl) ether, which is an amine crosslinking agent, was formed. In this case, the reflective coating layer was formed by mixing the above materials in 100 ml of an organic solvent, acetone, and coated on a PVC film, followed by drying for 2 hours at 70 ℃.

Example  2

Specimens were prepared in the same manner as in Example 1 except that 80 g of aluminum, 15 g of titanium, and 5 g of bis (3-aminopropyl) ether were used as the reflective coating material.

Example  3

Specimens were prepared in the same manner as in Example 1 except that 75 g of aluminum, 17.5 g of titanium, and 7.5 g of bis (3-aminopropyl) ether were used as the reflective coating material.

Example  4

Specimens were prepared in the same manner as in Example 1 except that 75 g of aluminum, 17.5 g of titanium, and 7.5 g of 1,3-diamino-2-hydroxypropane, an amine crosslinking agent, were used as the reflective coating material.

Comparative example  One

Specimens were prepared in the same manner as in Example 1 except that 90 g of aluminum, 5 g of titanium, and 5 g of bis (3-aminopropyl) ether were used as the reflective coating material.

Comparative example  2

Specimens were prepared in the same manner as in Example 1 except that 71 g of aluminum, 17 g of titanium, and 12 g of bis (3-aminopropyl) ether were used as the reflective coating material.

Comparative example  3

Specimens were prepared in the same manner as in Example 1 except that 80 g of aluminum, 17 g of titanium, and 3 g of bis (3-aminopropyl) ether were used as the reflective coating material.

Comparative example  4

Specimens were prepared in the same manner as in Example 1 except that 75 g of aluminum, 17.5 g of titanium, and 7.5 g of trimethylolpropantolylene isocyanate were used as the crosslinking agent.

Comparative example  5

Specimens were prepared in the same manner as in Example 1 except that 80 g of aluminum, 13 g of titanium, and 7 g of bis (3-aminopropyl) ether were used as the reflective coating material.

Comparative example  6

Specimens were prepared in the same manner as in Example 1 except that 70 g of aluminum, 22 wt% of titanium, and 8 g of bis (3-aminopropyl) ether were used as the reflective coating material.

2. Reflectance Measurement and Calculation

The reflectance of each specimen prepared according to Examples 1 to 4 and Comparative Examples 1 to 6 was measured at 450 nm, 530 nm and 600 nm wavelengths corresponding to blue, green and red of visible light with a reflectometer (CM3500d, Minolta, Japan). After that, the average value was calculated.

3. Reflectance evaluation

Table 1 shows the average reflectance of each specimen prepared according to Examples 1 to 4 and Comparative Examples 1 to 6.

Psalter reflectivity(%) Psalter reflectivity(%) Example  One 75.25 Comparative example  2 64.78 Example  2 79.92 Comparative example  3 78.75 Example  3 77.52 Comparative example  4 68.49 Example  4 76.98 Comparative example  5 65.71 Comparative example  One 66.84 Comparative example  6 78.98

Referring to Table 1, in the case of the specimen prepared according to Examples 1 to 4, the average reflectance of visible light was 75% to 80%.

However, in the case of Comparative Example 1 in which aluminum is more than 80% by weight and Comparative Example 2 in which the amine-based crosslinking agent is more than 10% by weight, the reflectance rapidly dropped to about 65%.

On the other hand, in the case of Comparative Example 3 in which the amine-based crosslinking agent was added in less than 5% by weight, the reflectance was satisfactory, but peeling of the reflective coating layer occurred. And in the case of Comparative Example 4 to which isocyanate-based crosslinking agent which is generally used instead of amine crosslinking agent was applied, the reflectance was about 68%, and the reflectance was somewhat lower than that of Examples 3 to 4 to which amine crosslinking agent was applied.

In addition, in the case of Comparative Example 5 in which titanium is added in less than 15% by weight, the reflectance was about 66%, and in Comparative Example 6 in which titanium was added in excess of 20% by weight, the reflectance was nearly 80%. In spite of the increase in the titanium content, the reflectance did not increase any more, and the cost of forming the reflective coating layer was only increased.

Figure 4 is an exploded perspective view of the LED lighting fixture using the lens structure according to the invention, Figure 5 is a front side perspective view of the LED lighting fixture shown in Figure 4, Figure 6 is a back of the LED lighting fixture shown in Figure 4 Side perspective view, and FIG. 7 is a vertical cross-sectional view of the LED lighting fixture shown in FIG. 4.

4 to 7, the illustrated lens structure includes a printed circuit board 410, a lens structure 420, and a cover plate 430.

The printed circuit board 410 provides a position where the LED chip is mounted by soldering and is connected to an external power source. The printed circuit board 410 may be formed of a soft material. However, the printed circuit board 410 is preferably a metal printed circuit board (Metal PCB) formed of metal so that the heat generated by the driving of the LED chip can be effectively transferred to the back side. .

As shown in FIG. 8, the front surface of the printed circuit board 410 has three lens coupling protrusions at regular intervals from the center of the LED chip 415 coupled to the printed circuit board 410 by soldering 416. 417 is formed. 8 illustrates an example of one LED chip 415, but in reality, many LED chips are mounted on a printed circuit board, and the lens coupling protrusion 417 is also a unit of three LED chips. Is formed.

In addition, a plurality of cover coupling protrusions 412 having screw grooves are formed at the front edge of the printed circuit board 410. Cover coupling protrusion 412 is for fixing the cover plate 430 and the printed circuit board 410, a plurality of formed on the edge of the printed circuit board 410, as shown in Figure 4 printed circuit board It may also be formed in the central portion of the 410.

The plurality of lens structures 420 cover each of the plurality of LED chips, and serve to condense and diffuse the light emitted from the plurality of LED chips to the outside. Since the plurality of lens structures 420 have the same configuration as described with reference to FIGS. 1 to 3, detailed description thereof will be omitted.

The cover plate 430 has a plurality of holes 431 formed to expose the front surface of each of the plurality of lens structures 420, and a screw hole 432 is formed at an edge thereof to form a cover protrusion 412. The screw is coupled to the printed circuit board 410 through. At this time, fastening means such as bolts 440a and nuts 440b may be used.

Although not shown in the drawings, the LED lighting apparatus according to the present invention may further include a heat dissipation sheet coupled to the rear surface of the printed circuit board 410 and dissipating heat generated by the driving of the LED chip toward the rear surface.

The heat dissipation sheet discharges heat generated by the driving of the LED chip toward the rear surface through high thermal conductivity. As the heat dissipation sheet, a carbon-based material such as graphite, carbon black, and carbon nanotubes can be used. In addition, in order to more efficiently radiate heat generated from the LED chip, a cooling element may be further disposed on the rear surface of the heat dissipation sheet.

Cold and hot elements using the principle of the magnetic field is generally characterized in that one side is cooled when the power is supplied, the other side is heated. Such a cold and warm element can present a Peltier (representative). Therefore, when power is supplied to the cold / warm element, the surface in contact with the heat radiating sheet is cooled, and the opposite surface is heated.

LED lighting apparatus according to the present invention can exhibit a high heat dissipation efficiency without forming a separate heat dissipation structure through the heat dissipation sheet and the cold and warm element, it is possible to improve the life characteristics of the LED chip.

As described above, the LED lighting device to which the lens structure according to the present invention is applied can stably cover the LED chip through the lens structure shown in FIGS. 1 to 3, and also form a chrome-free reflective coating layer inside the lens case. As a result, the light emission efficiency can be improved by reflecting light emitted from the side of the lens toward the front side.

In addition, it is possible to exhibit high heat dissipation characteristics by disposing the heat dissipation sheet and the cold and warm elements on the back of the printed circuit board.

Although the above has been described with reference to one embodiment of the present invention, various changes and modifications can be made at the level of those skilled in the art. Such changes and modifications may belong to the present invention without departing from the scope of the present invention. Therefore, the scope of the present invention will be determined by the claims described below.

1 is an exploded perspective view of a lens structure according to the present invention.

FIG. 2 is a vertical cross-sectional view of the lens structure shown in FIG. 1.

3 is a combined perspective view of the lens structure shown in FIG. 1.

4 is an exploded perspective view of an LED lighting fixture using the lens structure according to the present invention.

5 is a front side perspective view of the LED lighting fixture shown in FIG.

FIG. 6 is a rear perspective view of the LED lighting fixture illustrated in FIG. 4.

FIG. 7 is a vertical sectional view of the LED lighting fixture shown in FIG. 4.

8 illustrates an example in which an LED chip is soldered to a printed circuit board.

Claims (6)

A lens having a tapered shape having a larger diameter toward the front side, having a rear groove formed at the center of the rear surface, and having a diffusion surface formed at the front surface thereof; And And a lens case made of a plastic material having an accommodating groove formed in the lens shape to accommodate the lens in the accommodating groove and having three leads formed in a rear direction from a front edge thereof. The inner surface of the accommodating groove of the lens case is formed with a reflective coating layer made of a mixture of 70 to 80% by weight of aluminum, 15 to 20% by weight of titanium and 5 to 10% by weight of an amine crosslinking agent is emitted to the side of the lens. A lens structure, characterized in that for reflecting light toward the front. The method of claim 1, The support portion extends from the back of the receiving groove, wherein the end of the support structure, characterized in that the same height as the three leads. delete A printed circuit board made of metal; A plurality of LED chips mounted on the front surface of the printed circuit board by soldering; A plurality of lens coupling protrusions formed three at regular intervals from a center of each of the plurality of LED chips; A plurality of cover coupling protrusions formed on a front edge of the printed circuit board and having screw grooves formed therein; A plurality of lens structures covering each of the plurality of LED chips and condensing and diffusing light emitted from the plurality of LED chips; And A plurality of holes are formed to expose the front surface of each of the plurality of lens structures, and a screw hole is formed at an edge thereof, the cover plate made of a metal material screwed to the cover coupling protrusion; Each of the plurality of lens structures The tapered shape increases in diameter toward the front side, and a rear groove is formed so that the LED chip is located at the center of the rear surface, a lens having a diffusion surface formed on the front surface, and a receiving groove corresponding to the lens shape are formed. The lens is accommodated in the accommodating groove, and three leads are formed in the rear direction from the front edge to be fitted into the three lens coupling protrusions, and the inner surface of the accommodating groove is made of aluminum 70-80 wt% and titanium 15 An LED luminaire comprising: a lens case having a reflective coating layer formed of a material in which ˜20 wt% and an amine crosslinking agent are mixed in an amount of 5 to 10 wt%. The method of claim 4, wherein The lighting fixture And a heat dissipation sheet coupled to the rear surface of the printed circuit board and dissipating heat generated by the LED chip driving toward the rear surface. The method of claim 5, The lighting fixture The LED lighting device is coupled to the rear surface of the heat dissipation sheet, the surface in contact with the heat dissipation sheet further comprises a cold and warm element is heated to the opposite side.

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