KR200446413Y1 - LED lighting apparatus - Google Patents

Abstract

The present invention includes a circuit board provided with a plurality of LED assemblies connected to the control unit, and a lens plate formed on the LED assembly and formed with two-sided convex lenses having a radius of curvature of 1 to 1.2 times the width of each LED; The convex lens of the lens plate and the LED lighting fixture corresponding to the light emitting surface of each corresponding LED and having a depth of 0.2 ~ 0.7 times the width of each of the LED lighting fixture is formed, the light emitted from the LED By collecting and optimizing the range, it is possible to provide uniform color illumination by preventing color distortion of the ambient light while maintaining the light intensity evenly.

LED, Circuit Board, Lens Board, Convex Lens, Housing

Description

LED lighting apparatus

The present invention relates to an LED lighting device, and more particularly, by covering a plurality of LEDs (Light Emitting Diode) with a lens plate having a groove portion, the groove portion of the lens plate functions to adjust the light divergence angle of the LED to The light is concentrated and irradiated at the corresponding area to be illuminated, as well as the LED luminaire to achieve an intense lighting effect with little improved illumination and distortion at this time.

Recently, luminaires using LEDs have been widely used to solve problems of high power consumption and short lifespan of conventional heating bulbs such as halogen lamps and incandescent lamps.

Utility Model Registration No. 0421188 discloses a lighting fixture using such LEDs, which extends light emitted from a plurality of LEDs through a convex lens so as to concentrate irradiation on a portion to be illuminated.

However, according to the line design, it is possible to arrange the convex lens plate in front of the LED so that the light of the LED is extended irradiation, each LED when the convex lens plate does not properly set the angle of the light emitted by the LED If the light is not overlapped, and the light is not gathered and spreads widely, this is the cause of the occurrence of the part of the low illumination and the color of the ambient light yellow when the lighting fixtures operate.

The present invention is to solve the problems of the conventional luminaires as described above, LED lighting fixtures to maintain the illuminance of the light emitted from each LED evenly, to be collected and reflected in the desired area and to not distort the color of the ambient light Its purpose is to provide.

The above object of the present invention includes a circuit board provided with a plurality of LED assemblies connected to the control unit, and a lens plate formed on the LED assembly and formed with two-sided convex lenses having a radius of curvature of 1 to 1.2 times the width of each LED. Is configured; Each convex lens of the lens plate is achieved by providing an LED luminaire having corresponding grooves having corresponding depths of the respective LEDs and having groove portions having a depth of 0.2 to 0.7 times the width.

According to another aspect, the groove portion is characterized in that the convex lens shape having a radius of curvature of 0.6 ~ 0.7 times the width of the LED.

The present invention, in addition to the above features, the two-sided convex lens of the lens plate is arranged at equal intervals along each radial and arc direction of the LEDs are installed in a plurality of concentric circles along the outer circumferential direction in the central axis of the circuit board It features.

The LED luminaire of the present invention is formed on the inner surface of the lens plate corresponding to the LED by forming a convex lens having a groove portion having the same width as the LED and having a depth of 0.2 to 0.7 times the width of the LED, respectively, By optimizing the range of light emitted from the light evenly maintains the illuminance of the light and prevents color distortion of the ambient light has the effect of providing a uniform color illumination.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view of an LED lighting device according to an embodiment of the present invention, Figure 2 is an exploded perspective view of the LED lighting device according to an embodiment of the present invention, Figure 3 is a lens plate of part A of FIG. One side cross-sectional view, Figure 4 is a side cross-sectional view of the LED lighting fixture according to an embodiment of the present invention, Figure 5 is a side cross-sectional view showing another embodiment of Figure 3, Figure 6 according to another embodiment of the present invention A side cross-sectional view of the LED luminaire, and FIG. 7 is a schematic diagram showing the intensity of light emitted from the lens plate.

The LED applied to the present embodiment generates white light, and has been described as an example in which unnecessary yellow ambient light is generated around the center light during operation. Herein, the central light means light having a uniform color and brightness appearing at the center of the irradiation surface illuminated by the luminaire, and the ambient light means light having a uniform color and brightness appearing around the center light.

The radius of curvature is a measure of the degree of bending at each point of a curved surface or curve. The radius of curvature refers to the radius when a small part of the curve is regarded as an arc and the arc is extended to form a circle.

As shown in Figures 1 to 6, the LED lighting device according to an embodiment of the present invention is a housing 50, the interior of the hollow, and the plurality of LEDs disposed on the interior of the housing 50 and the upper surface 21 Is provided with a circuit board 20, a heat sink 30 coupled to a rear surface of the circuit board 20, and a bottom surface of the heat sink 30 electrically connected to the circuit board 20 by an electric wire 41. The control unit 40 is installed in the cover, the lens plate 10 which is coupled to the housing 50 to cover the front of the LED 21 and is disposed in front of the LED 21 and a predetermined distance apart from the housing, Coupled to the lower surface of the 50 is made of a power input terminal unit 60 that is electrically connected to the control unit 40.

The lens plate 10 has a width equal to that of the LED and preferably has the same width as that of the LED so as to adjust a divergence angle of light emitted from the LED 21 on a bottom surface corresponding to the LED 21. Projections 12 as convex lenses having a radius of curvature of 1 to 1.2 times are formed on the lower surface of the disc, respectively, and a plurality of convex lenses 11 are formed on the upper surface corresponding to the protrusions 12.

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The housing 50 has a container shape with an open top and bottom surfaces, and a protruding piece 52 is formed on an inner circumferential surface thereof to fix the circuit board 20 and the heat sink 30.

The convex lens 11 of the lens plate 10 and the LEDs 21 of the circuit board 20 correspond to the same line on the coupling surface of the housing 50 coupled to the lens plate 10. An incision 53 is formed to engage so that it can be arranged. In this case, the cutout 53 is coupled to the protrusion 14 of the lens plate 10 by an adhesive or fitting method.

In addition, a heat dissipation groove 51 is formed on an outer circumferential surface of the housing 50 to dissipate heat from the circuit board 20 and the heat dissipation plate 30 to the outside, and the heat dissipation groove 51 is one long groove. It is formed as or as formed in a plurality of through holes.

The circuit board 20 is a circular PCB having a plurality of LEDs 21 installed on an upper surface thereof. The LEDs 21 receive power from a wire 41 electrically connected to the control unit 40. 21 is preferably installed on the upper surface of the circuit board 20 by surface mount technology (SMT) so that the heat dissipation plate 30 coupled to the rear surface may be in close contact with the circuit board.

The LEDs 21 are arranged at equal intervals along the radial direction and the arc direction, respectively, drawing a plurality of concentric circles along the outer circumferential direction from the central axis of the circuit board 20, and convexity of the lens plate 10. Lenses are preferably installed in the same shape corresponding to the LED (21).

This is to ensure that the light irradiated from the LED 21 is uniformly irradiated without a shadow area as a whole. If the LED 21 is compared with a light bulb composed of only one light, a plurality of LEDs 21 emit light. It can be seen that the overlapping ranges have an effect of widening the range of the center light and reducing the range of the ambient light.

On the other hand, the edge of the circuit board 20 has a groove portion 23 is engaged with the protruding piece 52 formed on the inner circumferential surface of the housing 50 to be stably fixed to the housing 50.

The heat sink 30 is coupled to the back surface of the circuit board 20 for heat generation of the LED 21, the shape of the circuit board 20 using a metal material such as copper, aluminum effective for heat dissipation. It is preferable to form a circular plate shape that is consistent with the above, and if necessary, a modification such as forming a heat radiation fin (not shown) on one surface in order to increase the contact area between the heat sink 30 and air is possible.

In addition, in installing the heat sink 30 on the bottom surface of the circuit board 20, the bottom surface of the circuit board 20 may include a thermal conductive material such as a thermal compound so as to increase heat transfer efficiency. Do.

In addition, a groove 33 is formed at the edge of the heat sink 30 to which the protrusion pieces 52 formed on the inner surface of the housing 50 are fitted so as to be stably coupled to the housing 50.

The control unit 40 includes a rectifying circuit for converting an AC input from the power input terminal unit 60 into a DC suitable for driving the LED 21, and if the LED 21 operates in an AC, the rectifying circuit. Do not install it.

The lens plate 10 is disposed in front of the LED 21 at a predetermined distance to expand the light of the LED 21 to spread to both sides, and a plurality of lens plates 10 corresponding to each other on the upper and lower surfaces of the lens plate 10. Two convex lenses 11 and protrusions 12 are formed above and below the disc, and grooves 13 are formed in the center of the protrusions 12 to adjust the light divergence angle.

The disc of the lens plate 10 is formed of the same material as the convex lens, but should be thin enough to prevent light from spreading through the inside of the disc and at the same time have sufficient rigidity, so that the thickness of about 1.2 to 1.5 mm is preferable. Do.

The convex lens 11 of the lens plate 10 is formed in the same arrangement and number as the arrangement and number of the LEDs 21 installed on the circuit board 20, the bottom surface of the lens plate 10 is the LED ( 21) is placed in front to be in close contact with the upper surface.

The convex lenses 11 on the upper surface of the lens plate 10 allow the linear light emitted from the LEDs 21 to be individually spread, and the radius of curvature of the convex lenses 11 varies depending on the size of the LEDs 21. It may be possible to have a radius of curvature of 1 ~ 1.2 times the width of the LED.

For example, when using the LED 21 which is about 4.5 mm in diameter which consumes 0.18W of electric power, it is preferable to form it with the curvature radius of 4.5-5.4 mm.

The protrusion 12 formed on the lower surface of the lens plate 10 has the same radius of curvature as the convex lens 11 formed on the upper surface, and as shown in FIGS. 3 and 7, the groove portion of the lens plate 10 is formed. The light of the LED 21 incident through the 13) is reflected and refracted by the protrusion 12 so as to be emitted through the front convex lens 11. The protrusion 12 reflects light according to the principle of total reflection, and when total light is incident from the optically dense medium into the small medium, when the incident angle is greater than a certain angle, it means that the reflection is not reflected and is fully reflected.

A groove 13 is formed in the center of the protrusion 12 formed on the bottom surface of the lens plate 10, and the depth h of the groove 13 is preferably 0.2 to 0.7 times the width of the LED. Form to have.
At this time, when the groove 13 is less than 0.2 times the width of the LED, the generation of ambient light is severe, and when it is larger than 0.7 times, the bending range becomes large and reflection on the side becomes impossible.

That is, for example, in the case of using the LED 21 having a diameter of about 4.5 mm, which consumes 0.18 W of power, forming a depth of 2 mm is effective in reducing the distortion of ambient light emitted from the LED 21. In this case, the angle at which the light of the LED 21 is irradiated is about 44 degrees, and when the light of the LED 21 is irradiated at such an angle, the yellow color of the ambient light is significantly reduced to 2/5 or less compared with the prior art. do. Table 1 below looks at the rate at which the ambient light is reduced according to the change in the depth h of the groove 13.

Groove Depth (mm) Flat lens groove irradiation angle (°) Convex lens groove irradiation angle (°) Ambient light (%) 0.5 34 - 82 One 42 - 51 2 43 - 46 2 - 44 40 3.5 53 - 75

At this time, the bottom of the groove 13 is preferably formed of a convex lens as shown in Figure 5 and 6 so as to more effectively collect the light of the LED 21, more preferably the The radius of curvature of the convex lens formed in the groove 13 is formed to have a radius of curvature of 0.6 to 0.7 times the width of the LED.

That is, for example, in the case of using an LED having a diameter of about 4.5 mm and a convex lens having a curvature radius of 5.1 mm that consume 0.18 W of power, the convex lens of the groove portion has a depth of 2.7 on the bottom of the groove portion formed with a depth of 2 mm. It is desirable to form a radius of curvature of ˜3.15 mm.

In addition, when compared with the line utility model in which only the convex lens 11 is formed on the upper surface of the lens plate 10, the line utility model measures roughness of 58 lx on the irradiation surface of 2 m in front, whereas the lens plate ( In the case where the convex lens 11, the projection 12 and the groove 13 are formed on the lower surface of 10), 90 lx illuminance is measured on the front 2m irradiation surface, thereby improving the illuminance by 1.5 times or more.

On the other hand, as shown in Table 1, when the depth of the groove 13 is less than 0.9mm or more than 3.15mm, the irradiation angle of the LED 21 is too wide or narrowed so that each of the LEDs 21 Irradiation sites that do not overlap are generated, and as a result, the distortion reduction and the enhancement of illumination of the peripheral color as described above are not achieved.

As shown in Table 1, when the depth of the groove 13 is less than 0.9mm and 0.5mm, the irradiation angle of the lens plate 10 having the groove 13 is flat is 34 degrees, and the ambient light is reduced by 18%. 82%.

In addition, in the case of 3.5mm exceeding 3.15mm, the irradiation angle of the lens plate 10 in which the groove 13 is flat is 53 degrees, so that the ambient light is reduced by 25% to 75%.

In addition, when the depth of the groove 13 is 1 mm in the range of 0.9 to 3.15 mm, the irradiation angle of the lens plate 10 having the groove 13 flat is 42 degrees, and the ambient light is reduced by 49%. 51%.

In addition, when the depth of the groove 13 is 2mm in the range of 0.9 to 3.15mm, the irradiation angle of the lens plate 10 having the groove 13 is flat is 43 degrees, and the ambient light is reduced by 54%. When the convex lens is formed in the groove 13, the irradiation angle of the lens plate 10 is 44 degrees, and the ambient light is reduced by 60% to 40%, indicating that the ambient light is significantly reduced. .

The power input terminal unit 60 is coupled to the lower surface of the housing 50, the terminal 61 for supplying power applied to the end to the control unit 40 for fixing the power input and the lighting fixture is installed The terminal 61 may be integrally formed with the power input terminal 60 and may be separately installed and electrically connected as necessary.

At this time, the power input terminal 61 may be configured as a socket type, if necessary, as shown in FIG.

As shown in Figure 2, the luminaire of the present invention according to this configuration is coupled to the heat sink 30 to the back of the circuit board 20 and the LED 21 mounted on the front of each connected to the control unit 40 After this, the circuit board 20 is coupled to the internal space of the housing 50.

In this case, the controller 40 is electrically connected to the circuit board 20 through a power line 41 passing through the through hole 31 of the heat sink 30, and the circuit board 20 and the heat sink 30. ) Is coupled by engaging the grooves 23 and 33 with the protrusions 52 of the housing 50, so that the grooves 23 and 33 can be stably fixed without any unstable movement such as rotation in place, and in this state, the screw hole 22 It is fixed to the screw fastening hole 62 through the screw (32) with (24).

At this time, the LED 21 of the circuit board 20 and the convex lenses 11 of the lens plate 10 are placed on the same line, respectively, as shown in FIG.

When an external power source is applied through the terminal 61, power is supplied to the circuit board 20 through the control unit 40 and the power line 41, and light is emitted to the LED 21 installed on the circuit board 20. The light emitted from the LED 21 is condensed through the convex lens-shaped groove 13 and then irradiated at an optimized angle through the convex lens 11 on the outer surface of the lens plate 10 to be ambient light. It reduces the amount of distortion and illuminates the light of a uniform color.

As described above, the present invention has been described with reference to specific embodiments, but is not necessarily limited thereto, and modifications and variations may be made without departing from the scope of the technical idea of the present invention.

For example, the LED of the LED luminaire according to the present embodiment has been described as a case that consumes 0.18W of power and uses an LED having a diameter of about 4.5mm, but various outputs such as high-power LEDs that consume 1W of power are used. Of course, it can be applied to the LED having.

1 is a perspective view of an LED lighting fixture according to an embodiment of the present invention.

Figure 2 is an exploded perspective view of the LED lighting fixture according to an embodiment of the present invention.

3 is a side cross-sectional view showing one lens plate as part A of FIG.

Figure 4 is a side cross-sectional view of the LED lighting fixture according to an embodiment of the present invention.

5 is a side cross-sectional view of another embodiment of FIG.

Figure 6 is a side cross-sectional view of the LED lighting fixture according to another embodiment of the present invention.

7 is a schematic diagram showing the intensity of light emitted from the lens plate.

Explanation of symbols on the main parts of the drawings

10; Lens plate 11; Convex lens

12; Protrusion 13; Home

14; Protrusion 20; Circuit board

21; LED 22, 32; Screwman

23, 33; Groove 24; screw

30; Heat sink 31; Through

40; Control unit 41; Power line

50; Housing 51; Heat dissipation groove

52; Protrusion 53; Incision

60; Power input terminal 61; Terminals

62; Screw fastener

Claims (3)

A circuit board having a plurality of LED assemblies connected to a control unit, and a lens plate formed on the LED assemblies and having two-sided convex lenses having a radius of curvature of 1 to 1.2 times the width of each LED; Each convex lens of the lens plate is formed with a groove portion corresponding to the light emitting surface of the corresponding LED, each having a depth of 0.2 ~ 0.7 times the diameter. The method of claim 1, The groove is an LED luminaire, characterized in that the convex lens shape having a radius of curvature of 0.6 ~ 0.7 times the width of the LED. The method of claim 1, And a double-sided convex lens of the lens plate is disposed at equal intervals along each of radial and arc directions of LEDs installed in a plurality of concentric circles along a circumferential direction from a central axis of the circuit board.

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