KR101647725B1 - Lighting apparatus - Google Patents

Abstract

An embodiment includes a circuit board, a plurality of light sources arranged in an array on the circuit board, and a plurality of light sources disposed in each of the plurality of light sources, the plurality of light sources having a first width in the longitudinal direction of the circuit board, A lens having a second width narrower than the first width in a width direction of the circuit board orthogonal to the first width and having a recessed portion having a minimum point on a vertical axis corresponding to the center of the light source, The curvature of the first curve passing through the lowest point in the width direction is smaller than the curvature of the second curve passing the lowest point in the width direction.

Description

[0001]

An embodiment relates to a lighting apparatus.

Generally, indoor or outdoor lighting is used as a lamp or a fluorescent lamp. In the case of such a bulb or fluorescent lamp, there is a problem that its lifetime is short and it is frequently exchanged. In addition, a conventional fluorescent lamp may deteriorate over time, and the illuminance may gradually decrease.

In order to solve such a problem, a light emitting diode (LED) capable of realizing excellent controllability, fast response speed, high electric light conversion efficiency, long swimming, low power consumption, Various types of lighting modules are being developed.

Light emitting diodes (LEDs) are a type of semiconductor devices that convert electrical energy into light. The light emitting diode has advantages of low power consumption, semi-permanent lifetime, fast response speed, safety, and environmental friendliness compared with conventional light sources such as fluorescent lamps and incandescent lamps. Accordingly, much research has been carried out to replace an existing light source with a light emitting diode, and a light emitting diode has been increasingly used as a light source for lighting devices such as various liquid crystal displays, electric sign boards, and street lamps used outside the room.

LEDs that have been used only for visual signal applications are being used as LED lights.

Although LED lighting is a lighting that is well-known for its high reliability and brightness, it also has limitations as a point light source.

In recent years, research is underway to prevent dark portions generated in a space between a plurality of LEDs.

The illumination device according to the embodiment is intended to prevent dark portions generated between a plurality of light sources, and to minimize the quantity and power consumption of a plurality of light sources.

An illumination apparatus according to an embodiment of the present invention includes a circuit board, a plurality of light sources arranged in an array on the circuit board, and a plurality of light sources disposed on each of the plurality of light sources, the light source having a first width in the longitudinal direction of the circuit board, And a lens having a recessed region having a minimum point on a vertical axis corresponding to a center of the light source, the lens having a second width narrower than the first width in a width direction of the circuit board perpendicular to the longitudinal direction, The curvature of the first curve passing through the lowest point in the longitudinal direction may be smaller than the curvature of the second curve passing the lowest point in the width direction.

The illumination device according to the embodiment has the advantage that the directivity angle of the light can be enlarged in both side directions through the lens disposed on the light source and the light quantity of the light emitted in the center and side directions of the lens can be made similar.

In addition, since the distance between adjacent light sources can be increased, there is an advantage that the number of light sources, manufacturing cost, and power consumption can be reduced.

1 is a perspective view showing a lighting apparatus according to an embodiment.
2 is an exploded perspective view schematically showing the illumination device shown in Fig.
3 is a top view showing the top surface of the light source unit shown in Fig.
4 is a cross-sectional view of the light source and the lens shown in Fig. 3 cut in the longitudinal direction (x).
5 is a cross-sectional view of the light source and the lens shown in Fig. 3 taken in the width direction (y).
6 is a light distribution diagram showing the distribution of light emitted through a lens according to an embodiment.

Hereinafter, embodiments will be described in detail with reference to the drawings.

Fig. 1 is a perspective view showing a lighting apparatus according to an embodiment, and Fig. 2 is an exploded perspective view schematically showing the lighting apparatus shown in Fig.

1 and 2, the illumination apparatus includes a light source unit 110, an optical housing 120 that accommodates the light source unit 110 and has an opening 129 at least at one end thereof, an opening 129 of the optical housing 120 And a heat dissipation unit 150 coupled to the optical housing 120 and absorbing and radiating heat generated in the light source unit 110. [

In addition, the illumination device may include, but is not limited to, a power source unit (not shown) that supplies power to the light source unit 110.

The light source unit 110 may include a plurality of light sources (not shown).

The plurality of light sources may be arranged with a constant pitch to emit uniform light.

The plurality of light sources can be set in consideration of the luminous intensity of the illumination apparatus, and the pitch and the number thereof. In addition, the plurality of light sources may emit white light, or light emitted from adjacent light sources may be mixed to emit white light.

The plurality of light sources may be light emitting diodes or laser diodes, but are not limited thereto.

A detailed description of the light source unit 110 will be described later.

The optical housing 120 protects and supports the light source unit 110 in an external shock, moisture, and the like, and diffuses light generated in the light source unit 110.

The optical housing 120 has a structure in which the light source unit 110 is accommodated and the light source unit 110 is connected to the power source unit through openings 129 at both ends.

For example, the optical housing 120 may have a shape in which both end portions in the longitudinal direction are opened and have an empty space therein. Specifically, the optical housing 120 may be cylindrical in the longitudinal direction as shown in FIG. 1, but is not limited thereto.

The light source unit 110 may be positioned on one side of the inner surface of the optical housing 120 and the heat dissipation unit 150 may be disposed on the outer surface of the optical housing 120 which overlaps the light source unit 110.

At least one of the inner surface and the outer surface of the optical housing 120 may include at least one of a diffusion particle and a fluorescent material capable of preventing glare caused by light emitted from the light source unit 110 and uniformly emitting light to the outside have.

A prism pattern or the like may be formed on at least one of the inner surface and the outer surface of the optical housing 120.

The optical housing 120 may be formed of a material including polyethylene terephthalate (PET), polycarbonate (PC), polymethyl methacrylate (PMMA), or the like.

The heat dissipating unit 150 is made of a metal material having an excellent rigidity and an excellent thermal conductivity so as to increase rigidity of the optical housing 120 and to transmit heat generated from the optical housing 120 to the outside. Lt; / RTI > For example, a material selected from Cu, Al, Ti, Mg, and Fe, or an alloy thereof.

Fig. 3 is a top view showing the top surface of the light source unit shown in Fig. 2, Fig. 4 is a sectional view of the light source and the lens shown in Fig. 3 cut in the longitudinal direction (x) (y), and Fig. 6 is a light distribution diagram showing the distribution of light emitted through the lens according to the embodiment.

3 to 5, the light source unit 110 includes a circuit board 112, a plurality of light sources 114 arranged in the longitudinal direction x on the circuit board 112, and a plurality of light sources 114 And a lens 216 disposed on the lens 216. [

Here, the circuit board 112 may be, for example, a printed circuit board (PCB), a flexible printed circuit board (FPCB), and a metal core printed circuit board (McFCB).

In the embodiment, the circuit board 112 is an FR4 printed circuit board.

The circuit board 112 may include a non-conductive base layer (not shown), a copper foil layer (not shown), and an insulating layer (not shown).

The circuit board 112 can supply driving power so that light is emitted from the plurality of light sources 114.

Here, the plurality of light sources 114 may be a light emitting device package including a light emitting device or a light emitting device.

The lens 216 may be a transparent material, or may be a transparent material including diffusion particles and fluorescent particles for diffusing light, but is not limited thereto.

4 and 5, the light source 114 includes a light emitting element 210, first and second lead frames 212 and 214 electrically connected to the light emitting element 210, first and second lead frames 212 and 212, And a body 220 that forms a cavity s on the first and second surfaces 214 and 214.

The body 220 may be made of a resin material such as polyphthalamide (PPA), silicon (Si), aluminum (Al), aluminum nitride (AlN), AlOx, photo sensitive glass (PSG) (PA9T), syndiotactic polystyrene (SPS), a metal material, sapphire (Al2O3), beryllium oxide (BeO), ceramics, and a printed circuit board (PCB).

In addition, the body 220 may be formed by injection molding, etching, or the like, but is not limited thereto.

The first and second lead frames 212 and 214 are made of a metal material such as titanium, copper, nickel, gold, chromium, tantalum, (Al), indium (In), palladium (Pd), cobalt (Co), silicon (Si), germanium (Ge), indium Hafnium (Hf), ruthenium (Ru), and iron (Fe).

Also, the cavity (s) may be filled with a resin containing at least one of a phosphor and a diffusion particle, but is not limited thereto.

The lens 216 has a first width d1 in the longitudinal direction x of the circuit board 112 as shown in Fig. 4 and has a circuit board 112 (D2) narrower than the first width (d1) in the width direction (y)

Here, the first width d1 may be 2 to 3 times the second width d2, and may be less than 2 times or 3 times the second width d2, so that the light emitted toward the adjacent light source 114 The light intensity may be increased or decreased, and dark portions may be generated.

First, the lens 216 shown in Fig. 4 will be described.

The lens 216 includes a first and second vertexes Hp1 and Hp2 symmetrical with respect to each other in the longitudinal direction x with respect to the lowest point Lp and a depression area having a lowest point Lp on the vertical axis z of the upper surface of the light emitting element 210, , And Hp2).

In the embodiment, the first protruding area Hs1 is described as having one first vertex Hp1 and the second protruding area Hs2 as one second vertex Hp2. However, the first protruding area Hs1 is limited to the number of vertices .

The recessed region has a first curve sp1 passing the lowest point Lp in the longitudinal direction x and a second curve sp1 passing the lowest point Lp in the width direction y shown in Fig. sp2 form a second curvature.

Here, the first curvature may be smaller than the second curvature.

That is, the recessed region is formed to have the first curvature that is the smallest in the longitudinal direction (x) from the lowest point Lp located at the center of the light emitting device 210, and the second curvature having the largest width in the width direction (y) Respectively.

As shown in FIG. 3, the lens 216 is formed in the shape of an '8' in the longitudinal direction (x), so that it can be seen that the lens 216 has a semi-elliptical shape when viewed from above.

Any inclined line connecting the lowest point Lp and the first vertex Hp1 may form an inclination angle? 1 of 20 ° to 50 ° with the upper surface of the light emitting device 210 or the upper surface of the circuit board 112 And the directivity angle of the light source 114 can be maintained at 150 to 160 degrees.

Also, at least one of the first and second protruding regions may have a first thickness b1 at least at one of the first and second vertexes Hp1 and Hp2, b2).

Here, the second thickness b2 may be 1.1 to 1.8 times the first thickness b1.

If the second thickness b2 is less than 1.1 times the first thickness b1, the light intensity is higher than the central portion and the side portion of the light source 112 to generate a hot spot. If the second thickness b1 is greater than 1.8 times the first thickness b1, ) May be thickened as a whole.

5 is a cross-sectional view taken along the width direction (y) of the circuit board 112, unlike FIG.

Here, the lens 216 includes a first and second sub-mirrors 219 and 218 symmetrical with respect to each other in the longitudinal direction x with respect to the depression area having the lowest point Lp on the vertical axis z on the upper surface of the light emitting element 210 and the lowest point Lp, And a first protruding region having a first vertex including vertices Hp1_1 and Hp1_2.

Any inclined line connecting the lowest point Lp and the first auxiliary vertex Hp1_1 may form an inclination angle? 2 of 40 ° to 60 ° with the upper surface of the light emitting element 210 or the upper surface of the circuit board 112 , The directivity angle of the light source 114 can be maintained at 150 to 160 degrees.

That is, the inclination angles? 1 and? 2 are factors that can determine the size and orientation angle of one lens 216 and can be adjusted according to the size and steering angle of the lens 216.

In an embodiment, the lens 216 is shown contacting the light source 114, but may be spaced apart from the light source 114.

That is, the lens 216 may be formed with a groove in which the light source 114 may be disposed, and may be formed with a protrusion that contacts the circuit board 112 to separate the light source 114, I do not.

In addition, the reflecting member for reflecting the light emitted from the light emitting element 210 as the first and second protruding regions may be disposed or applied to the recessed region of the lens 216, but is not limited thereto.

Referring to FIG. 6, it can be seen that the light distribution is reduced at the center of the recessed region of the lens 216, and the directivity angle is formed to be 150 to 160 degrees by the curvature toward the first and second protruding regions.

Also, it can be seen that the amount of light for the light emitted through the recessed region and the first and second protruding regions is uniformly distributed in the lens 216. [

The embodiments of the present invention are not intended to limit the scope of the present invention but to limit the scope of the present invention. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (10)

A circuit board;
A plurality of light sources arranged in an array on the circuit board; And
The circuit board having a first width in a longitudinal direction of the circuit board and a second width in a width direction of the circuit board perpendicular to the longitudinal direction and narrower than the first width, And a lens having a recessed region having a lowest point on a corresponding vertical axis line,
In the recessed region,
The curvature of the first curve passing through the lowest point in the longitudinal direction,
Is smaller than a curvature of a second curve passing through the lowest point in the width direction. The method according to claim 1,
The lower surface of the lens,
Wherein the light source is disposed in contact with the light source. The method according to claim 1,
The lens,
And first and second protruding regions symmetrical to each other in the longitudinal direction with respect to the recessed region,
Wherein the first projecting region
And at least one vertex. The method of claim 3,
The lens,
Wherein the first thickness is formed to a first thickness at the lowermost point and the second thickness is 1.1 to 1.8 times the first thickness at the apex. The method of claim 3,
And an arbitrary slant line connecting the lowest point and the vertex,
And forms an angle of inclination of 20 ° to 50 ° with the upper surface of the circuit board. The method according to claim 1,
The first width may be,
Wherein the second width is two times to three times the second width. The method according to claim 1,
The lens,
A lighting device that is transparent. The method according to claim 1,
The lens,
And at least one of diffusion particles and fluorescent particles. The method according to claim 1,
And a heat dissipation unit for absorbing and dissipating heat generated in the circuit board. The method according to claim 1,
And an optical housing coupled to the circuit board and adapted to diffuse light emitted from the plurality of light sources.

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