KR101817321B1 - Lighting Apparatus and Control Method thereof - Google Patents

Abstract

The present invention relates to a lighting apparatus and a control method thereof. Specifically, the present invention relates to a lighting apparatus which comprises a plurality of light sources, and realizes a smooth rotary dimming effect by controlling light emitted by the plurality of light sources. According to an embodiment of the present invention, the lighting apparatus comprises: a ring-shaped substrate having a hollow unit formed therein; the plurality of light sources arranged on the substrate, and radially arranged around the hollow unit; and a light guide arranged in an upper part of the substrate, having an inner surface corresponding to an arrangement of the light sources, and having a region irradiated with the light emitted by the light source.

Description

≪ Desc / Clms Page number 1 > Lighting Apparatus and Control Method &

The present invention relates to an illumination device and a control method thereof, and more particularly, to an illumination device that includes a plurality of light sources and controls light emitted therefrom to exhibit a smooth rotary dimming effect.

Dimming refers to changing the light flux of a light source in a lighting fixture for dramatic effects in the lighting environment, for changing the atmosphere, or for energy saving. (Or an illuminating device) in which a plurality of light sources such as LEDs are arranged is used for household appliances such as refrigerators, TVs, smart phones, ornaments, automobile accessories, and the like. These dimming devices provide the user with driving information of the product through light emission, or provide a beautiful appearance, thereby causing the user to feel aesthetic.

Conventionally, an illumination device having a ring shape is disclosed as an illumination device in which a plurality of light sources such as LEDs are arranged. Fig. 1 shows a ring-shaped illumination device according to Japanese Unexamined Patent Application Publication No. 2007-287456 as a prior art.

Referring to FIG. 1, there is disclosed a lighting device in which a plurality of LEDs are arranged on a ring-shaped substrate and each of the LEDs is controlled by tilting the substrate, and the angle of the LED is changed to broaden the adjustment range of the working distance The present invention discloses an invention for securing the same.

According to the conventional art disclosed in FIG. 1, it is possible to obtain various lighting or light control effects by controlling each of a plurality of LEDs, but there is a problem that the number of LEDs is required too much due to the structural limitations. In particular, in the conventional art disclosed in FIG. 1, a plurality of LEDs are directly controlled on / off / brightness, and the light sources are arranged to be directed toward a user or an object to be illuminated, which is structurally discontinuous. Therefore, the user recognizes it as rough dimming instead of soft dimming. In addition, since a large number of LEDs are required, manufacturing costs and power consumption are also increased.

Japanese Patent Application Laid-Open No. 2007-287456

The present invention discloses an illumination device and a control method thereof that can remarkably reduce the number of LEDs and realize a smooth rotary dimming effect as compared with the above-mentioned conventional technology.

According to an embodiment of the present invention there is provided an illumination system comprising a ring shaped substrate with a hollow portion formed therein, a plurality of light sources arranged on the substrate, arranged radially about the hollow portion, and a plurality of light sources arranged on the substrate, And a light guide having an inner surface and having a region irradiated with light emitted from the light source,
Wherein the plurality of light sources are arranged radially with respect to the hollow portion, wherein the plurality of light sources are arranged in a state inclined at a predetermined angle with respect to a tangential direction of the ring-shaped substrate, and the inner surface of the light guide is shaped like a toothed wheel And a space in which the plurality of light sources are to be disposed is provided.

The light source unit may be disposed between the hollow portion and the inner surface of the light guide when the light guide is disposed on the substrate.

The illumination device according to an embodiment of the present invention may further include a light shielding part disposed on the light guide to form a light shielding area.

At this time, the height formed by the film disposed on the light guide and the light guide on the basis of the substrate may be lower than the vertical height of the region irradiated with the light emitted from the light source.

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According to one embodiment, the plurality of light sources may be arranged on the substrate as 2n (where n is a natural number) light source units as an array of one row.

According to another embodiment of the present invention, a ring-shaped substrate having a hollow portion formed therein; 2n light source parts arranged on the substrate and arranged radially about the hollow part; And a light guide disposed at an upper portion of the substrate and having a region irradiated with light emitted from the light source portion, the control method comprising the steps of: controlling light emitted from two light source portions symmetrically located on the opposite side with respect to the hollow portion; And the other light source unit is controlled as the minimum brightness when one light source unit is at the maximum brightness.

Here, the two light sources symmetrically positioned on the opposite sides with respect to the hollow are increased or decreased in inverse proportion to each other.

And a dimming time of the illumination device is PWM-controlled to realize a rotary dimming effect.

According to an embodiment of the present invention, the number of light sources can be drastically reduced compared to the prior art, so that the manufacturing cost of the lighting apparatus can be reduced, and the power consumption required to obtain the same degree of illumination or dimming effect can be reduced .

Specifically, in the related art, a method of direct on / off control of an LED facing a user to realize a rotary dimming effect has been used. In the present invention, however, a flat light guide (together with a side Light is applied) to realize a rotary dimming effect in a manner of reflecting light, so that the number of necessary light sources can be reduced. Further, in the illumination apparatus according to the embodiment of the present invention, the light source is arranged in a form inclined at a predetermined angle from the tangential direction of the circumference, so that the number of light sources that have been conventionally required can be further remarkably reduced.

In addition, according to an embodiment of the present invention, it is possible to provide a lighting device control method for realizing a smooth rotating dimming.

1 is a view showing a ring-shaped illumination device of the prior art.
2 is a perspective view showing a lighting apparatus according to an embodiment of the present invention.
3 is a view showing a lighting apparatus according to the first embodiment of the present invention.
4 is a view showing a lighting apparatus according to the first embodiment of the present invention and a lighting apparatus according to the second embodiment.
5 is a view showing a state in which a film is applied to the illumination device of FIG.
6 is a diagram for comparing the required number of light sources according to the size of the substrate in the illumination device according to the first embodiment of the present invention and the illumination device according to the second embodiment.
7 is a schematic diagram illustrating brightness of each light source defined according to a control method of a lighting apparatus according to an embodiment of the present invention.
8 is a schematic diagram for explaining the control method of the illumination apparatus of Fig.
9 is a graph showing a change in brightness of a light source with time.

The embodiments described below are provided so that those skilled in the art can easily understand the technical idea of the present invention, and thus the present invention is not limited thereto. In addition, the matters described in the attached drawings may be different from those actually implemented by the schematic drawings to easily describe the embodiments of the present invention.

Also, the expressions such as 'first, second', etc. are used only to distinguish a plurality of configurations, and do not limit the order or other features between configurations.

The expression " comprising " is intended to be merely an expression of the presence of that element as an " open representation ", and should not be understood as excluding any additional elements.

It should also be noted that the device or element orientation (e.g., "x axis", "y axis", "z axis", "front", "back", "up" The terms and predicates used herein to refer to terms such as "top", "bottom", "left", "right" It will be understood that they are used for the sake of clarity or for the sake of clarity of the relationships of components and do not denote or imply that the associated device or element should have a particular orientation.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

2 is a perspective view showing a lighting apparatus according to an embodiment of the present invention.

An illumination device according to an embodiment of the present invention includes a ring-shaped substrate 10 having a hollow portion; A plurality of light sources arranged on the substrate (10) and arranged radially about the hollow portion; And a light guide 20 disposed on the substrate 10 and having an inner surface 24 corresponding to the arrangement of the light sources and having a region irradiated with light emitted from the light source.

The substrate 10 of the present invention may be a PCB (Printed Circuit Board) or a PWB (Printed Wiring Board). The light source of the present invention may be disposed on the substrate. At this time, the light source may be disposed on the upper surface of the flat substrate, or may be partially embedded in the flat substrate.

The light source disposed on the substrate 10 may be controlled to be controlled on / off or controlled to emit light by being electrically connected to a power source and / or a control unit (not shown). As used herein, the term "connection" may include a direct connection or indirect connection of one member to another member.

The substrate 10 may be mounted on various electronic appliances such as a refrigerator, a TV, a home appliance, a smart phone, an ornament, a car accessory, a PC, a speaker, and the like.

The light source of the present invention may be an LED (Light Emitting Diode) or an OLED (Organic Light Emitting Diode), but the present invention is not limited thereto. The light source may have a directionality, Whatever it is.

One feature of the present invention is that unlike the illumination apparatus of the related art described in the background art, the light source irradiates light in a direction substantially parallel to the flat surface of the substrate, rather than irradiating light in a direction substantially parallel to the normal direction of the substrate Is used. In short, a side light source is used. At this time, the light source of the present invention irradiates light from the center (or the hollow portion) of the substrate 10 toward the circumferential direction.

Thus, the light emitted from the light source reaches the surface of the light guide 20 adjacent to the light source, and is reflected on the surface of the light guide 20, thereby recognizing that the user is illuminating the light. The prior art differs from the present invention in that the principle of illumination differs from that of the present invention because the light is not directly reflected to the user but is directly reflected on the user's eyes.

In the present invention, a path through which light travels can be formed on the surface of the flat light guide 20. That is, a pattern can be formed. In a specific portion, a pattern is formed so as to reflect light in a predetermined direction, and a pattern is formed in the remaining portion so that light is not reflected in a predetermined direction. In the present specification, the dimming effect refers to the effect of adjusting the brightness and darkness of the object by changing the luminance of the object surface, or a change in saturation colorfulness or a change in color reflected from the object surface.

According to one embodiment of the present invention, a light source is disposed between the hollow portion and the inner surface 24 of the light guide 20 when the light guide 20 is disposed on the substrate 10 .

The illumination device according to an embodiment of the present invention may further include a film 30 disposed on the light guide 20 to form a light shielding area. Here, the film 30 includes a light control film 31 for reflecting (or transmitting) light and a light shielding film for absorbing light. The light-shielding film may be further divided into a first light-shielding film 32 and a second light-shielding film 33. The film 30 may also be formed in a ring shape and a light control film 31 is formed between the first light blocking film 32 and the second light blocking film 33.

In summary, a light guide 20 is formed on the upper surface of the plate-like substrate 10, and a film 30 is formed on the light guide 20. The light guide 20 irradiates light in a direction in which the substrate 10 is laminated when the light source is arranged on the substrate 10 and the height formed by the light guide 20 and the film 30 is formed by the light source 20, The light emitted from the light source is not blocked by the light guide 20 and the film 30. [

On the other hand, the light guide 20 may be formed to have the shape of the inner side surface 24 corresponding to the arrangement of the light sources. The inner side surface 24 may mean a structure in which the inner periphery of the ring-shaped light guide 20 is recessed in the radial direction of the light guide 20. For example, referring to the illuminating device according to the first embodiment to be described later, the inner side surface 24 can be formed into a polygon having a plurality of sides in accordance with the number of light sources. Referring to the illuminating device according to the second embodiment, The side surface 24 may be formed to have the same shape as a whole toothed wheel. The shape of the inner side surface 24 of the light guide 20 may function to direct the direction of the light source and may provide a space for structurally arranging the light source.

Next, the lighting apparatus 100 according to the first embodiment of the present invention and the lighting apparatus according to the second embodiment will be described with reference to Figs. 3 to 6. Fig. 3 is a view showing a lighting apparatus 100 according to the first embodiment of the present invention. For convenience of explanation, some examples will be described. For example, Fig. 3A shows an illumination device with a diameter L1 of 50 mm, Fig. 3 (b) shows an illumination device with a diameter L2 of 80 mm and Fig. 3 (c) shows an illumination device with a diameter L3 of 110 mm .

As described above, in the illumination device 100 according to the first embodiment, a plurality of light sources 110 are arranged on a ring-shaped substrate having a hollow portion. Specifically, the plurality of light sources 110 are arranged on a substrate as an array of one row.

Referring to FIG. 3 (a), in the lighting apparatus having the diameter L1 of 50 mm, 24 light sources 110 are required. In order to realize the rotary dimming effect, the area of the dimming area required for each product of the produced lighting apparatus is predetermined, and a specific distance d1 between the light source 110 and the dimming area 120 is determined. If there are fewer than twenty-four light sources, the distance d1 between the light source 110 and the light modulation area 120 becomes farther away, so that the predetermined light modulation area is changed and an error occurs in the design value.

Referring to FIG. 3 (b), in the lighting apparatus having a diameter of 80 mm, 14 light sources 110 are required, and a specific distance d2 between the light source 110 and the light modulation area 120 is determined. Referring to FIG. 3C, eleven light sources 110 are required in a lighting apparatus having a diameter L3 of 110 mm, and a specific distance d3 between the light source 110 and the light modulation region 120 is determined at this time . In general, when a coarse-spot width R formed by one unit light source is constant, it can be seen that a plurality of light sources are required for a product having a small diameter in order to realize a rotary dimming effect in an illumination device.

As described above, the illumination device 100 according to the first embodiment of the present invention has the structure of the substrate 10, the light source 110, the light guide 20, and the film 30, By arranging the number of the light sources 110 and the distance between the light sources 110 according to the size, the user can realize a desired dimming effect.

4 is a front view showing a lighting apparatus according to the first embodiment of the present invention and a lighting apparatus according to the second embodiment.

Referring to FIG. 4A, when 12 light sources are formed on the basis of an illumination device having a diameter of L, a light control area 120 having a specific area is formed. In contrast, FIG. 4B, Referring to FIG. 4, when nine light sources are formed on the basis of an illumination device having a diameter of L and the same diameter, the light modulation region 120 having the same area as that of FIG. 4A can be formed.

According to one embodiment of the present invention, the plurality of light sources 210 are radially arranged around the hollow portion, and all of the plurality of light sources 210 are arranged at a predetermined angle with respect to the tangential direction of the ring- Can be arranged in the photograph state. Here, the inclination angle of the light source 210 may be set differently according to the size of the product, and accordingly, the number of the light sources 210 may be adjusted. It can be confirmed that the number of the light sources can be reduced compared to the same dimming effect through such an embodiment.

5 is a view showing a state in which a film is applied to the illumination device of FIG. The film 30 may be overlaid on the light guide 20 shown in Figure 4. The film 30 includes first and second light shielding regions 130 and 140 and second light shielding regions 230 and 240, , 220) can be clearly distinguished. This makes it possible to increase the sharpness of the rotary dimming.

FIG. 6 is a view for more clearly comparing the illumination apparatuses according to the first and second embodiments of the present invention, specifically for comparing the number of light sources required for each size of substrate (size of illumination apparatus) .

Figs. 6 (a) and 6 (d) show the substrate when the diameter is 50 mm, Figs. 6 (b) and 6 And Fig. 6 (f) show a state when the diameter of the substrate is 110 mm. 6 (a) to 6 (c), as the diameter of the substrate becomes smaller, a larger number of light sources are required in order to secure a rotary dimming area having the same area. 6 (d) to 6 (e), in contrast to the lighting apparatuses of FIGS. 6 (a) to 6 (c) corresponding thereto, all the conditions including the diameter of the substrate And the light emitting direction of the light source is inclined, the number of necessary light sources can be remarkably reduced. As an example, when the inclination degree of the light source irradiation direction is 45 degrees, the number of light sources can be reduced by 47% in FIG. 6 (d) compared to FIG. 6 (a) In FIG. 6E, the number of light sources can be reduced by 35%, and in FIG. 6C, the number of light sources can be reduced by 21%.

The first embodiment has the advantage that the number of light sources can be reduced compared with the prior art. However, when the illumination apparatus according to the second embodiment is used, It can be greatly improved. The manufacturing cost of the lighting apparatus can be reduced, and as a result, the power consumption required to obtain the same degree of illumination or dimming effect can be reduced to a large extent. In view of this, it has a significance to provide an optimum dimming solution in accordance with the flow of low power consumption and slimming of the product in recent electronic devices.

Next, a method for controlling the lighting apparatus of the present invention will be described with reference to Figs. 7 to 9. Fig. 7 is a schematic diagram illustrating brightness of each light source defined according to a control method of a lighting apparatus according to an embodiment of the present invention. 8 is a schematic diagram for explaining the control method of the illumination apparatus of Fig. 9 is a graph showing a change in brightness of a light source with time.

A rotary dimming control method is disclosed in order to realize a smooth rotation effect and aesthetic effect in a circular or ring-shaped illumination device. In the present invention, a ring-shaped substrate 10 in which a hollow part is formed; A plurality of light sources arranged on the substrate (10) and arranged radially about the hollow portion; And a light guide (20) disposed on the substrate (10) and having a region irradiated with light emitted from the light source.

In this embodiment, 2n (where n is a natural number) light sources may be arranged on the substrate as an array of one column.

7 and 8, in the control method of the present embodiment, in two light sources symmetrically positioned on the opposite sides with respect to the hollow portion, when one light source is the maximum brightness, the other light source is the minimum brightness .

And the two light sources symmetrically located on the opposite sides with respect to the hollow portion may be controlled to increase or decrease in inverse proportion to each other.

Specifically, the brightness of the k-th light source has a brightness according to Equation (1). Where k is the number of light sources and may have a range of 1, 2, 3, ..., 2n (where n is a natural number).

[Equation 1]

Specifically, in the case of the lighting device in which 24 light sources are formed, in the first step S710, the brightness of the first light source LED is 100%, the brightness of the second light source LED is about 91.7%, the brightness of the third light source LED ), The brightness of the fourth light source (LED) is about 75%, the brightness of the fifth light source is about 66.6%, the brightness of the sixth light source is about 58.3%, the brightness of the seventh light source is about 50% , The brightness of the eighth light source is about 41.7%, the brightness of the ninth light source is about 33%, the brightness of the tenth light source is 25%, the brightness of the eleventh light source is 16.6%, the brightness of the 12th light source is 8.3% And the brightness of the second light source is 0%. Then, the brightness increases again from the 14th light source, and the 15th light source is 8.3%, the 16th light source is 16.6%, and the 24th light source is 91.7% sequentially. In the present invention, a flat board and a light guide together with an algorithm for controlling the same can be configured as in Equation (1), thereby exhibiting a smooth rotary dimming effect. In some cases, the film 30 may be added to the upper portion of the light guide to clearly distinguish between the light control area and the light shielding area.

The illumination device according to the number of light sources can be implemented by arranging two light sources facing each other in the inverse proportion to the brightness in inverse proportion as shown in FIG. For example, FIG. 8 (a) shows six light sources, FIG. 8 (b) shows eight light sources, and FIG. 8 (c) shows ten light sources.

In this embodiment, when the time taken from one light source to the maximum brightness at the OFF state (minimum brightness) is A, the time at which one light source is turned OFF after the maximum brightness at the OFF state (minimum brightness) In this condition, the light emission time interval for each light source is 2A / 2n (where 2n is the number of light sources). And the time required for the rotation of the light source (1 cycle) is 2 A.

By controlling the illuminating device under these conditions, a graph of the light source brightness change as shown in FIG. 9 can be obtained. For reference, FIG. 9 shows duty ratios of brightness changes over time of an illuminating device having eight light sources.

It is possible to realize a smooth rotary dimming effect for the lighting apparatus of the present invention by sequentially PWM-controlling the dimming time for the light source disposed on the substrate. By appropriately controlling the dimming time, the rotational speed of the rotary dimming of the lighting apparatus can also be controlled. Further, when using an RGB light source, the color can be freely changed.

The present specification is not intended to limit the present invention by the specific terms given. While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Modifications, alterations, and modifications can be made.

The scope of the present invention is defined by the appended claims rather than the foregoing description, and all changes or modifications derived from the meaning and scope of the claims and equivalents thereof are deemed to be included in the scope of the present invention. .

10: substrate
20: Light Guide
24: My side
30: Film
31: dimming film
32: First light-shielding film
33: Second light-shielding film
100: Lighting device according to the first embodiment
110: Light source
120: Light modulation area
130: Shading area
200: illumination device according to the second embodiment
210: Light source
220:
230: Shading area

Claims (9)

A ring-shaped substrate on which a hollow portion is formed;
A plurality of light sources arranged on the substrate and arranged radially about the hollow portion; And
And a light guide disposed on the substrate and having an inner surface corresponding to the arrangement of the light sources and having a region irradiated with light emitted from the light source,
Wherein the plurality of light sources are radially arranged around the hollow portion,
Wherein the plurality of light sources are arranged at a predetermined angle with respect to the tangential direction of the ring-shaped substrate,
Wherein an inner side surface of the light guide is formed to have the same shape as a toothed wheel, and a space in which the plurality of light sources are to be disposed is provided.
The method according to claim 1,
Wherein the light source is disposed between the hollow portion and the inner surface of the light guide when the light guide is disposed on the substrate.
The method according to claim 1,
And a film disposed on the light guide to form a light shielding region.
The method of claim 3,
Wherein a vertical height at which the film is disposed on the light guide and the light guide on the basis of the substrate is lower than a vertical height of a region irradiated with light emitted from the light source.
delete The method according to claim 1,
Wherein the plurality of light sources are arranged on the substrate as an array of 2n light sources (where n is a natural number).
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