WO2012165907A2

WO2012165907A2 - Led planar lighting system based on light-guide plates and method for installing same

Info

Publication number: WO2012165907A2
Application number: PCT/KR2012/004356
Authority: WO
Inventors: 명범영
Original assignee: 주식회사 에이치지엠
Priority date: 2011-06-02
Filing date: 2012-06-01
Publication date: 2012-12-06
Also published as: WO2012165907A3

Abstract

After a finishing material for a ceiling is installed in a ceiling of an indoor space without installing an electric-wire pipe, LED planar lighting devices based on light-guide plates are directly attached to a surface of the ceiling finishing material at desired positions without cutting the ceiling finishing material. Separately, a converter for converting common alternating current voltage into direct current voltage, which is required for operating a plurality of LEDs in the planar lighting devices, is installed at a readily accessible position, and connected to each planar lighting device through cables for low direct current voltage. The wiring path of the cables comprises a ceiling section, which reaches each planar lighting device across the ceiling finishing material. The cables in the ceiling section are wired such that the cables are not buried within a metal electric-wire pipe but are attached to an outer surface of a lower portion of the ceiling finishing material or a finishing-material support member, or are mounted on the ceiling finishing material or the finishing-material support member. Each planar lighting device may be formed into various shapes as desired, and light-scattering elements of the light-guide plates are finely engraved through a sand blasting performed in a single step or in two steps.

Description

LGP-based LED lighting system and its installation method

The present invention relates to a surface lighting system employing a surface lighting mechanism composed of a light guide plate and an LED, and a method of installing the same.

Most conventional lighting fixtures, such as fluorescent lamps, use commercial AC power (220V, 60Hz AC power), so for safety reasons, many countries enforce laws by installing wires connected to lighting fixtures in a conduit. So is Korea. For this reason, the installation of existing lighting systems, including conduit installation, wire wiring, and lighting fixture installation, is done in parallel with the construction of the building. 1 and 2 are photographs showing a process of installing a lighting fixture on the indoor ceiling in a conventional manner. First, the installation position of the lighting fixture is determined according to the lighting design, and the conduit 10 is plumbed under the ceiling slab according to the determined position, and then the electric wire 12 is wired in the conduit 10. The branch box is connected to the conduit 10, and the branch line of the wire is extracted therefrom and prepared to be connected to a nearby lighting fixture (see FIG. 2 (b) or (c)). In parallel with this wiring work, the hanger bolt is embedded in the ceiling slab, and then the ceiling finishing material supporting member such as M-bar or T-bar is installed using it, for example, gypsum board or gypsum tex. Place the ceiling finishing material 14, such as. Installation of the luminaire is made after all of the ceiling finish 14 is installed. First, the corresponding part of the ceiling finishing material 14 is pulled out according to the size of the luminaire at a predetermined installation position, and the wires 18 previously extracted are exposed out of the part 16 taken out. Then, the lighting fixtures are connected to the wires 18, and the fixtures are embedded in the picked-up portion 16 and fixed. This completes the installation of one luminaire.

The existing lighting system using commercial AC power of 100V or more is complicated and difficult to install and requires professional skills for installation. In addition, the installation work is time-consuming and expensive (material and labor costs). Since the installation work must be done in parallel with the construction of the ceiling finishing material of the building, the lighting system installation work cannot be concentrated and the work efficiency is low. Compared to a lighting system using a DC power source, on / off control and illumination control are difficult.

Conventional indoor lighting fixtures are installed in a place where the ceiling finishing material is obtained, there is a disadvantage that the complex installation and construction is accompanied by the installation of lighting fixtures. In particular, one of the major disadvantages of conventional luminaires that follow such a buried installation is the invariability of the installation location. For example, there is a case where a change in circumstances such as a change in the use of a certain indoor space or a change of layout occurs, so that the position of the luminaire is arranged differently from the original design (that is, when the required illuminance varies for each area). This is because an efficient lighting is possible by changing the installation position of the lighting fixtures according to the changed circumstances. However, since the existing lighting fixtures are installed in close connection with the conduit piping and wire wiring, and ceiling finishing material picking construction, it is not easy to change the location of the existing lighting fixtures. To change the position, completely dismantle the ceiling finisher and the existing lighting fixtures, reconduct the conduit pipes and wires according to the changed position, and replace the ceiling finish with new ones. After preparatory work such as pruning, the lighting fixtures must be installed. The cost is high, the space can not be used for a considerable time, and a large amount of demolition waste is generated. Due to this inflexibility of the installation location, even if circumstances change in the indoor space, the existing lighting system is often used as it is. Therefore, the optimal lighting environment for the indoor space cannot be flexibly provided, and the excessive or under-illuminated state is left unattended. If you do.

When the luminaire is mounted in the ceiling, the light spread angle from the light source is limited by the reflector. Due to the narrow light spread angle, there is a large difference in illuminance between the area directly under the luminaire and the surrounding area. In order to minimize the difference in illuminance for each area, the arrangement of the lighting fixtures is inevitably tight. This causes overlighting problems.

Another disadvantage of the conventional lighting system is that it can only function as simple lighting that does not fit the space value. Even in the same space, there may be areas that need to be brighter and areas that may be less bright, depending on the lighting needs of the room, such as the purpose of the space, the layout and interior layout, etc. The need for lighting, such as need to be varied, can be varied and variable. However, conventional lighting systems are usually installed before such lighting needs are established or irrespective of such lighting needs, and in most cases the luminaires are evenly distributed evenly distributed in the interior space. In addition, it is difficult to respond flexibly to changes in lighting requirements. As a result, there may be areas of over or under lighting. In addition, it is difficult to determine the type of lighting fixture in consideration of the harmony with the space.

In addition, the existing lighting fixtures have only the shape of standard products that are determined and produced by the manufacturer. The diversity of the shape of the lighting fixtures was greatly lacking. Therefore, considering the purpose and layout of each indoor space, there was a limit in selecting a luminaire suitable for it. There was a difficulty in creating the shape or arrangement of lighting fixtures that would suit the particular interior space that consumers could choose.

On the other hand, recently, LED lighting fixtures using a DC power source has been spotlighted as a new lighting means. However, due to the preconception that most commercially available LED luminaires should replace luminaires such as fluorescent lamps that use AC power, conventional LED luminaires are Follow the installation form. In most cases, remove the existing luminaire and install the LED luminaire in the same place. Therefore, the power supplied to the input terminal of the LED luminaire is a commercial AC power supply of 100V or more. Therefore, LED luminaires driven by direct current low voltage of several volts or tens of volts are manufactured in a structure having a converter circuit that converts commercial AC voltage into direct current low voltage. Each LED lighting fixture has a converter circuit that is not only economical and inefficient compared to the configuration using a single common converter circuit for multiple LED lighting fixtures, but also reduces the weight and size of the LED lighting fixture. However, there is a problem of increasing the number of potential failure sources.

In addition, conventional LED luminaires are almost similar to those of other conventional luminaires that are alternatives in shape design. Beyond the limitations of the limited and uniform shape of the LED luminaire, there is a need for an LED luminaire that can be designed in a variety of shapes that can fit well with the purpose or atmosphere of the installation space. In addition, it is desirable that the configuration of the entire lighting system has characteristics that are convenient for installation, maintenance and maintenance.

On the other hand, the conventional LED surface lighting mechanism mainly adopts a light guide plate. A light scattering element is provided on the bottom of the light guide plate. Since light of the LED is scattered and reflected by the light scattering element and comes out of the light guide plate, the light scattering element acts like a light emitting part when viewed from the outside, so that the light scattering element portion remains in the surrounding area. Looks brighter than the area If the light scattering element (light emitting part) is large, the light appears rough, so it is preferable to make the light scattering element as small as possible, preferably small enough to be difficult to visually identify. In addition, the light scattering element is preferably in the form that allows the output light of the light guide plate to have a wide light spread angle. This is not enough. This is because the light spread angle is limited by the angle of the reflector when the LED surface lighting device is installed in the ceiling even if the light scattering element provides a wide light spread angle.

The present invention can be installed in the desired position on the surface of the ceiling finishing material without picking up the ceiling finishing material of the indoor space, and adopts a common converter configured separately from the surface lighting equipment, so that each surface lighting equipment has a low voltage direct current wire. It does not require materials and installation work for AC high voltage wiring, and it is easy and simple to install, and it can significantly reduce the lighting system construction period and construction cost, and if necessary, move the installation location of the surface lighting equipment without damaging the ceiling finishing material. It is an object of the present invention to provide an LED surface lighting apparatus based surface lighting system.

It is another object of the present invention to provide an LED surface lighting apparatus based surface lighting system that can be installed in various desired layouts of LED surface lighting apparatuses of various shapes desired to maximize decoration and lighting efficiency.

In addition, the present invention to provide a wide light spread angle to maximize the uniformity of the illumination in the interior space to prevent excessive roughness and to provide an LED surface lighting apparatus based surface lighting system that provides a lighting environment close to the natural light atmosphere Another purpose.

Another object of the present invention is to provide a method for constructing such an LED surface lighting device-based surface lighting system as an indoor lighting system of a building.

According to an aspect of the present invention for achieving the object of the invention as described above, as a surface lighting system installed on the ceiling of the interior space completed ceiling installation material, the ceiling finish material at the desired position of the lower surface of the ceiling finish material Light generated by a plurality of LEDs mounted on a strip-shaped printed circuit board on which a wiring circuit to which a direct current voltage is applied is printed without being incident on the side of the light guide plate and scattered by light scattering elements formed on the bottom surface thereof, One or more surface lighting devices configured to be reflected and emitted to the top surface; Installed at a position spaced apart from the one or more surface lighting apparatuses, and receives a commercial AC voltage to convert the DC voltage necessary for driving the plurality of LEDs of each of the surface lighting apparatuses to the one or more surface lighting apparatuses. A converter providing the DC voltage in common with respect to the DC voltage; And wires electrically connected in parallel from the converter to the one or more surface lighting devices such that the DC voltage of the converter is provided to an input terminal of the wiring circuit of each of the one or more surface lighting devices. A surface lighting system is provided which includes a DC low voltage wire that is fixed to the part by means of fastening means and is not embedded in a separate metal conduit.

The surface lighting apparatus, according to one embodiment, the attachment means for detachably attaching to the desired position of the lower surface of the ceiling finish without detaching the ceiling finish; The wiring circuit is printed and a plurality of LEDs are arranged in a stripe shape extending to the printed circuit board to be connected to the wiring circuit, and the plurality of LEDs emit light by a DC voltage provided to an input terminal of the wiring circuit. A light source module adapted to; Fine engravings are formed on the bottom surface as the light scattering element, and at least a part of the side surface is in close contact with the plurality of LEDs of the light source module, and the output light of the plurality of LEDs incident through the side surface is scattered and reflected. A light guide plate made of a transparent acrylic plate for emitting light; And a frame for accommodating the light source module and holding the edge of the light guide plate while being in close contact with the side surface of the light guide plate.

The surface lighting apparatus may include: a light guide plate made of a transparent acrylic plate, having an arbitrary shape desired, and having microengraves formed on the bottom thereof as the light scattering element, and a part or the entire section of the side surface is a curved side surface; And a printed circuit board having a plurality of LEDs mounted in a row, the plurality of LEDs grouped by a predetermined number, and having a wiring circuit for connecting the LEDs of the same group in series and connecting the groups and the groups in parallel. A light source module in which LEDs are closely arranged along a part or the entire section of the side surface of the light guide plate; And supporting the rear surface of the light source module, and covering the light source module and the upper and lower edges of the light guide plate and the bottom edge or all of the bottom surface of the light guide plate to be sandwiched and joined to each other, thereby concealing the light source module with the light guide plate. And a frame configured to maintain a close contact, and part or all of which is made of a thermally conductive metal, and a portion of the thermally conductive metal takes the heat of the light source module and serves as a heat sink to dissipate to outside air.

The wiring path of the electric wire includes a ceiling section extending from the ceiling finishing material to each surface lighting device, wherein the electric wire is fixed to the outer surface (bottom) of the ceiling finishing material or concealed of the ceiling finishing material. It includes a mainstream wire that is wired in a form that is mounted on the upper surface (upper surface), and one or more branch wires that are separated from the branch box installed in the middle of the mainstream of the wire and extends to each of the surface lighting devices.

The surface lighting system may further include an illumination control unit disposed between the converter and the surface lighting apparatuses to control the illumination of the surface lighting apparatuses by varying electric power supplied from the converter to the surface lighting apparatuses.

The electric wire is a flexible flat cable for direct current (FFC), it is preferable that the end of the electric wire and the input end of the wiring circuit is closed with a connector terminal to form a connector connection with each other.

The light scattering elements formed on the bottom surface of the light guide plate may include a plurality of first intaglios having a shape that is not uniform over the bottom surface and a size small enough to be difficult to visually recognize, and an average size of which is smaller and constant than the first intaglios. A plurality of second intaglios having a shape that is not formed are mixed, at least a portion of the first intaglio is an intaglio-engraved multi-negative structure in which at least a portion of the second intaglios are formed on an inner surface thereof, The remainder of the second intaglios is formed in an area where the first intaglios are not formed on the bottom surface. In this case, the light scattering elements scatter and reflect light incident to the side surface of the light guide plate so that the light scattering elements are output to the upper surface of the light guide plate with an optical spread angle of 130 to 170 degrees.

The surface lighting system further includes at least one attachment plate fixed to a desired position of the ceiling finishing material, and at least one portion of the at least one surface lighting fixture is disposed and fixed to each of the at least one attachment plate in a desired layout.

The wiring circuit groups the plurality of LEDs mounted on the printed circuit board in groups so that the LEDs in the same group are connected in series, and the groups and the groups are connected in parallel, and the converter belongs to the same group. A DC voltage corresponding to the sum of the operating voltages of the LEDs is provided to the wiring circuit.

On the other hand, according to another aspect of the present invention for achieving the above object, as a method for constructing a surface lighting system in the interior space of the ceiling finishing material installation work is completed, mounted on a band-shaped printed circuit board printed wiring circuit to which a DC voltage is applied The light generated by the plurality of LEDs is incident to the side of the light guide plate, and scattered and reflected by light scattering elements formed on the bottom surface of the one or more surface lighting devices configured to be emitted to the upper surface at a desired position on the lower surface of the ceiling finish material. Installing the ceiling finishing material without removing the ceiling finishing material; receiving a commercial AC voltage and converting the DC finishing voltage into the DC voltage required to drive the plurality of LEDs of each of the lighting devices, A converter that provides the DC voltage in common from the one or more surface lighting devices Installing at a spaced location; And wire wiring for electrically connecting the DC voltage of the converter to the input terminal of each of the one or more surface lighting apparatuses by electrically parallel connection from the converter to the one or more surface lighting apparatuses. In the wiring of the DC low-voltage wire, the wire is fixed to the necessary portion on the wiring path by using a fixing means is not embedded in a separate metal conduit, the wiring path of the wire is the ceiling finishing material A ceiling section extending from the ceiling to the respective surface lighting fixtures, wherein the wire is attached to an outer surface (bottom) below the ceiling finish or over a concealed upper surface (top) of the ceiling finish. Provided is a method for constructing a surface lighting system characterized in that the wiring in the form All.

The wire wiring step may include installing a mainstream electric wire near a surface lighting apparatus located farthest from the converter; And extracting a branch from the mainstream wire using a branch box and connecting the branch light to each surface lighting device.

The installation of the one or more surface lighting apparatuses may be performed by arranging and fixing the one or more surface lighting apparatuses to one or more attachment plates in a desired layout, and then fixing the attachment plate to a desired position of the ceiling finishing material.

The wire is a flexible flat cable for direct current (FFC), it is preferable that the end of the wire and the input end of the wiring circuit is closed with a connector terminal and connected to each other in a connector connection method.

The surface lighting apparatuses are preferably attached to the ceiling finishing material using attachment means that can be detached from the ceiling finishing material without damaging the ceiling finishing material that is attached when necessary.

According to the present invention, instead of having a built-in converter for each LED surface lighting device, all LED surface lighting devices use a common converter and provide a DC voltage necessary for driving the surface lighting device through the common converter. Weight and thickness can be reduced. In addition, it is possible to wire the DC low voltage wire from the converter to each surface lighting device. Therefore, it is not necessary to install the wiring wire in the metal conduit, and the wiring work is very simple and easy, and the installation material, installation work time and cost are significantly reduced. In addition, by implementing a remote control system easily and inexpensively, it is possible to increase space utilization value and realize high energy savings simultaneously.

In addition, according to the present invention, since it is possible to install the lighting fixture after the use and arrangement of the corresponding indoor space is determined and the lighting fixture arrangement method is determined accordingly, it is possible to arrange the most optimal lighting fixture for the indoor space.

Since the surface lighting equipment is installed in a non-embedded manner to be attached to the surface of the ceiling finishing material rather than being buried in a place where the ceiling finishing material is collected, it is not necessary to remove the ceiling finishing material. In addition, even after the installation of the surface lighting apparatus, if necessary, the installation position can be easily changed without damaging the ceiling finish material. Therefore, even if it is necessary to change the arrangement of lighting fixtures due to the change of the indoor space, it is possible to flexibly change the circumstances and harmonize the lighting environment at low cost without generating demolition waste. Through this, variable lighting that increases the value of the indoor space is possible, and excessive lighting can be avoided, thus contributing to energy saving.

Since the light scattering elements of the light guide plate have a multi-negative structure, the light spreading angle is very large to avoid excessive illumination of the local area and to produce a light ambience very close to natural light.

In addition, the shape and placement of the surface lighting fixtures can be varied according to the installer's intention, and the rich digital image can be combined with the lighting fixtures to create the lighting that best matches the installation location and provides high quality decoration. Therefore, the value of the indoor space can be increased.

1 is a photograph of the ceiling conduit and wiring construction scene according to the conventional construction method;

Figure 2 (a) is a ceiling finishing material picking scene for the installation of lighting fixtures after the construction of the ceiling finishing material according to the conventional construction method, (b) and (c) is a picture of the ceiling taken ceiling and wire wiring construction completed Is;

3 shows a configuration of a surface lighting system according to the present invention;

4 and 5 are an exploded perspective view and an assembled state diagram showing an example of the configuration of the LED surface lighting apparatus according to the present invention;

6 and 7 are cross-sectional views taken along the cutting line A-A of FIG. 5 with the curve frame closed and open;

8 is a view for explaining a method for processing an acrylic sheet in two stages by sequentially spraying sand particles of different sizes with two spraying apparatus according to the present invention;

9 shows a light guide plate processing method when the light source is disposed only on one side of the light guide plate;

FIG. 10 conceptually shows two-dimensional (2D) and three-dimensional (3D) shapes of multi-intaglio structures of intaglio-intaglio shapes formed on the surface of an acrylic sheet through a two-step sandblasting processing method according to the present invention; FIG.

Figure 11 (a) is a part of the processed surface of the acrylic plate processed by the two-step sandblasting processing method according to the present invention was taken by electron microscopy, (b) is the engraved-in-engraved form in (a) Is an enlargement of one of the multiple intaglio structures;

12 (a) and 12 (b) are photographs of the light emitting surfaces of the light guide plates respectively processed by the two-step sandblasting method and the one-step sandblasting method;

13 is a graph measuring the light spread angle of a light guide plate processed according to the present invention;

14 shows a method of installing a light guide plate-based LED surface lighting fixture according to a first embodiment of the present invention to a ceiling finish material;

15 is a plan view showing various shapes of a light guide plate based LED surface lighting fixture according to a second embodiment of the present invention;

16 to 20 show various examples of the cross-sectional configuration seen from the cutting line A-A of the LED surface lighting fixtures of FIG. 15;

21 is an exploded perspective view of the arc-shaped LED surface lighting mechanism shown in FIG. 15;

FIG. 22 exemplarily illustrates an indoor space in which a surface lighting system according to the present invention is installed with the wires exposed to the outside of the ceiling finishing material; FIG.

FIG. 23 exemplarily shows that LED surface lighting apparatuses of various shapes according to the second embodiment of the present invention can be installed in various layouts;

FIG. 24 shows attaching a set of surface lighting equipment to a ceiling finishing material in which a plurality of LED surface lighting apparatuses according to a second embodiment of the present invention are installed in a specific layout in advance.

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

1. Composition of the surface lighting system

(1) Figure 3 shows the overall configuration of a surface lighting system 100 according to an embodiment of the present invention. The surface lighting system 100 includes a plurality of surface lighting apparatuses 110 and a converter 140 for converting commercial AC power supply 150 of 100V or more into DC power required for driving the surface lighting apparatuses 110. Each surface lighting device 110 has a lighting LED lamp driven by a low voltage DC power source as a light source. The converter 140 is preferably implemented with an energy efficient switched-mode power supply (SMPS). SMPS converts AC voltage to DC voltage by rectifying, filtering, chopping, and converting commercial input power (220V AC voltage). The magnitude of the output DC voltage has a correlation with the magnitude of the operating voltage of the LED lamp 222 and the number of the LED lamps 222 connected in series. For example, when all the LED lamps 222 having an operating voltage of 3V are grouped in the same group of eight on the printed circuit board 224 and the LED lamps 22 of the same group are connected in series and connected in parallel between the groups. , The output voltage that the converter 140 should provide to the input terminal of the light source module 220 should be 24V DC. Each surface lighting device 110 is connected to the converter 140 through a DC wire 125. The end of the DC wire 125 is closed with a connector 127. From the outlet 150 to which the commercial AC power enters, the converter 140 is connected to the AC wire 145. The surface lighting system 100 may further include an illuminance controller 130 for controlling illuminance of each surface lighting apparatus 110 as necessary. In this case, the output of the converter 140 is provided to each surface lighting mechanism 110 via the illumination controller 130. The illuminance controller 130 includes a switch capable of turning on / off the surface lighting apparatuses 110. For example, dimming control of the LED lamp 222 is performed by varying the power provided to each of the surface lighting devices 110 by a PWM modulation method or a method of lowering forward current. The illuminance controller 130 may set a desired illuminance value through its own dial or by using the remote controller 160. In addition, it is preferable to have a communication unit capable of wireless communication with the remote control 160 to use the remote control 160 as a control input means.

(2) The surface lighting mechanism 200 according to the first embodiment

4 and 5 exemplarily show specific configurations of the LED surface lighting apparatus 200 according to the first embodiment of the present invention. The illustrated surface lighting device 200 is a so-called edge type LED surface lighting device 200 in which a plurality of LED lamps 222 are disposed on the side surface of the light guide plate 210. It is also a frame opening and closing type. 6 and 7 are cross-sectional views taken along the cutting line A-A of FIG. 5 when the cover frame 234 is in the closed and open states. The LED surface lighting apparatus 200 scatters and reflects the output light of the LED lamp 222 incident to the side, and outputs the light to the front surface (upper surface) to emit light, and at least one of the light guide plate 210. The light source module 220 which is disposed in close contact with the side and enters light into the light guide plate 210 through the side, and the frame 230 for wrapping the light guide plate 210 and the LED light source module 220 and combining them Include.

(b) light guide plate

First, the light guide plate 210 is made by cutting into a desired shape (for example, rectangular, square, round, elliptical, etc.) using a transparent acrylic plate as a material. The bottom surface of the light guide plate 210 is provided with light scattering elements for scattering and reflecting the light of the LED lamp 222 incident to the side to be emitted to the front (top). The light scattering element may be embodied in any one of them, such as a light scattering ink printed in a dot form, a groove cut in a V shape, and a fine engraving. However, since the light scattering element serves as a light emitting unit when viewed from the outside, when the size is larger than the visually discernible light, the light scattering element is spotted and light emitted from the light guide plate 210 is not preferable. . In order to compensate for this problem, when the diffusion film is covered on the light guide plate 210, the light efficiency is lowered. Therefore, a light scattering element in the form of an intaglio (fine intaglio) of a size small enough to be hardly discerned by the naked eye is preferable. In order to obtain uniform luminance throughout the light guide plate 210, the minute intaglio may be formed innumerably as a gradation pattern in which the density and / or size of the minute intaglio gradually increases as the distance from the light source is increased by, for example, a sandblasting process.

The inventors have already disclosed a method for processing a myriad of fine engravings on a light guide plate by a sandblasting method (Korean Patent Publication No. 10-2003-0079659) and a light guide plate (10-2003-0079749) processed by the processing method. One such prior art is intended to be included in the context of the present invention, and detailed description thereof will be omitted. However, the sandblasting method according to these two prior arts was a method of using sand particles of one size. The inventors later found that sandblasting the light guide plate using sand particles of two or three sizes significantly improved the light spread angle of the light guide plate and greatly improved the rough atmosphere of the output light than when using one size. It became.

(c) a light guide plate having a light scattering element having an engraved-in-engraved structure;

8 is an intaglio in which small intaglios are formed in a large intaglio by processing the acrylic plate 40 in two stages by using sand particles of different sizes with two injectors 30-1 and 30-2. The intaglio-in-intaglio). The first injector 30-1 and the second injector 30-2 for injecting the large sized sand particles 32-1 and the small sized sand particles 32-2 on the conveyor belt 22, respectively. ) Are arranged side by side and the flat funnel-type injection pipe 20 is sprayed sand particles are directed downward. The acrylic plate 40 to be processed is placed on the conveyor belt 22 so as to pass under the injection pipe 20.

First, the first injector 30-1 performs a one-step machining using sand particles having, for example, about 30-80 mesh. In the one-stage processing, if the sand particles are larger than 30 mesh, the size of the intaglio is so large that the output light is too coarse, and if it is smaller than 80 mesh, the degree of formation of the intaglio-in-intaglio structure by the two-stage machining may be reduced. have. However, the size of sand particles to be used in the first step and the second step is preferably determined relatively.

In the first injector 30-1, the large sized sand particles 32-1 pass through the injection pipe 20 at high speed by the first blower 36 and the second blower 38 via free fall. Sprayed. During the spraying, the sand particles 32-1 collide with the acrylic plate 40 while spreading in the shape of the outlet of the spray pipe 20. Separately, the conveyor belt 22 moves at a predetermined speed in a predetermined direction (horizontal direction). Since the width of the outlet of the injection pipe 20 is the widest in the center and narrows toward both ends, the number of sand particles 32-1 injected per unit time (that is, sand particles colliding with the acrylic plate 40) 32-1) is almost proportional to the size of the width of the outlet. That is, the center portion of the outlet of the injection pipe 20 is most and decreases toward both ends in the longitudinal direction. By this one-step processing, the surface of the acrylic plate 40 is formed innumerably fine intaglios having an irregular shape and a size that is indistinguishable to the naked eye. The distribution of the fine intaglio formed in the acrylic plate 40 of which the first step is completed is the highest at the portion facing the center of the outlet of the injection pipe 20 and gradually decreases toward both ends.

Subsequently, the two-step processing is performed while passing the primary processed acrylic sheet 40 under the second injector 30-2. This two-stage machining is sandblasted in the same way as the one-stage machining. However, only the size of the sand particles used is different. That is, since the two-stage processing is for forming smaller intaglios (intaglio-in-intaglio multi-negative structure) in the intaglio formed in the first stage machining, the size of the sand particles 32-2 used in the two-stage machining is 1 It is preferable that the size is approximately 1/2 to 1/3 smaller than the size of the sand particles 32-1 used in the step processing. For example, when sand particles of about 30-80 mesh are used in the first step processing, sand particles of about 120-250 mesh are preferably used in the second step processing.

Through the two-stage processing, the sand particles 32-2 injected through the injection pipe 20 are dispersed and collided with the entire surface of the acrylic plate 40. The intaglio by the two-stage processing is naturally smaller than the intaglio by the one-stage processing so that the intaglio is formed on the surface of the smooth light guide plate where the intaglios by the one-stage processing are not engraved, but also inside the intaglios formed by the one-stage processing ( Thereby forming an engraved-in-engraved multi-negative structure). The distribution density of the sand particles 32-2 sprayed in the two-stage processing (that is, the distribution density of the intaglio formed by the secondary processing) is the same at both ends in the longitudinal middle portion of the acrylic plate 40 as in the one-stage processing. It is desirable to decrease as it goes. With this intaglio distribution, a light source (not shown) should be disposed on the upper side 142a and the lower side 142b of the acrylic plate 40.

If the light source is disposed only on either side of the upper side 142a and the lower side 142b of the acrylic plate 40, the distribution density of the intaglios processed in one step and the intaglios processed in two steps is the one side. It should increase gradually from the (light source placement side) to the opposite side. To this end, the acrylic plate 40 may be processed using only half of the injection pipes 20 of the injection devices 30-3 and 30-4, as shown in FIG. 9. That is, what is necessary is just to spray the acryl board | plate material 40 in the form which only covered half of the exit part of the injection pipe 20.

From the above description, those skilled in the art will appreciate that the distribution density of the sand particles being injected may be changed as desired by changing the outlet shape of the injection pipe 20. In order to obtain a uniform brightness over the entire surface of the processed light guide plate, the density of the fine particles may be increased as the distance from the light source module disposed on the side of the light guide plate increases.

On one surface of the acrylic plate 40 subjected to the two-step sandblasting process as described above, a plurality of first intaglios having a size that is difficult to visually recognize and a plurality of second intaglios smaller than the first intaglios Are mixed and formed as a light scattering element. At least a portion of the second intaglios are formed on an inner surface of at least a portion of the first intaglios, which have a multiple intaglio structure in the form of an intaglio-intaglio. FIG. 10 conceptually shows two-dimensional (2D) and three-dimensional (3D) shapes of the multi-intaglio structure of the intaglio-intaglio form among the intaglios formed on the surface of the acrylic plate 40 through the two-step processing described above. As shown, at least a portion of the

large intaglios

50 and 52 formed by the primary machining, the small intaglios 55 are formed on the inner surface of the at least part 50 by the collision of the secondary processing sand particles 32-2. This results in a multi-engraved structure of engraved-in-engraved form. Secondary machining sand particles 32-2 may not collide with the inner surface of the remaining portion 52 of the first intaglios that are primarily processed, so that the second intaglio may not be formed and the surface of the primary machining state may be maintained as it is. . The remainder of the second intaglios formed by secondary processing is formed on a clean surface on which the first intaglios are not formed.

Figure 11 (a) is a part of the processed surface of the acrylic plate 40 processed by the two-step processing method as described above is taken with an electron microscope. Also through this photograph, the surface of the acrylic sheet 40 has the intaglio 52 in the primary processing state, the multiple intaglio in the form of engraved-in-engraved by primary and secondary processing, and the secondary processed intaglio. It can be seen that (57) are mixed. (B) of FIG. 11 is an enlarged view of any one of the multiple intaglios in the engraved-in-engraved form in (a). It can be seen that a plurality of second intaglios 55 by secondary processing are formed in the intaglio 50. It can be seen that the intaglio 50 also has a gentler inclination angle while the degree of roughness of the inner surface is much higher than the intaglio by processing sand particles of one size.

In performing the two-stage spraying process, the density distribution of the second intaglios is different from the density distribution of the first intaglios by the first-stage spraying process. That is, when the density ratio of the first intaglios in the nearest distance region and the farthest region is 1: N from the light sources of the first intaglios processed by the first machining, the ratio of the second intaglios processed by the second machining is It is preferable to perform the 1st and 2nd machining so that the density ratio in the nearest distance area and the farthest area may be 1: N / 3-1: N / 1.5.

In addition, the primary processing is to form a pixel (engraved) that is responsible for about 20-40% of the overall brightness of the light guide plate output light, and the secondary processing is about 60-80% of the remaining brightness of the light guide plate output light It is preferable to process so that the pixel (engraved) which is in charge of is formed. When the specific gravity of the intaglio by the primary processing exceeds 40%, the light guide plate output light appears relatively coarse, while when smaller than 20%, the light output efficiency is lowered.

12 (a) is a photograph of the light emitting surface of the light guide plate processed so that the large intaglio by the primary processing and the small intaglio by the secondary processing are mixed at such a ratio, (b) is a photograph of the primary processing only A photograph of the light emitting surface of the light guide plate. It can be seen that the former significantly reduced the roughness of the output light compared to the latter.

As a result of comparing and measuring the light efficiency and luminance uniformity of the two light guide plates, the former had about 20% improvement in light output efficiency compared to the latter. In addition, the luminance uniformity of the light guide plate was about 93% of the former, while the latter was about 80-88%.

Looking at the surface characteristics of the processed surface of the acrylic plate 40 processed through such a two-step process, (a) the surface roughness of the processed surface of the processed acrylic plate 40, (b) intaglio-in-engraved form The distribution density (number) of the second intaglios located on the inner surfaces of the first intaglios of the multi-concave structure, (c) the first intaglios (the first intaglios of the intaglio-in-intaglio type Occupied area) and the occupied area per unit area in the processing surface of the acrylic plate 40 of the second indents formed outside the first indents, and (d) the first indents and the first in the unit area. The average of the diameters and the maximum depths of the two indentations increases from the two

opposite sides

42a and 42b to the middle of the two sides when spraying as shown in FIG. 8, and acrylic when spraying as shown in FIG. 9. From either side 42b of the board 40 to the opposite side 42a It is.

Furthermore, the surface of the light guide plate 40 processed in two stages is formed in the form of a fine intaglio-intaglio intaglio and the degree of roughness and curvature of the inner surface of the light guide plate 40 is larger than in the prior art so that incident light is varied at various angles. Scatter, reflect. Therefore, the spread angle of the output light of the light guide plate 40 is further widened and smooth light dispersion is achieved. As the number of such multiple intaglios is formed, the light spread angle of the light guide plate is further expanded. 13 is a graph measuring the light spread angle of the light guide plate 40 processed in two steps. The light spread angle is up to 170 degrees, so it can be seen that it is much wider than that processed with one size of sand particles (about 130 degrees). Since the light spread angle is very wide, the arrangement interval between the surface lighting devices can be widened, so that a light atmosphere most similar to natural light can be obtained without causing a problem of locally over-illumination.

Although the two-stage processing has been described above, sand particles having a smaller size than the sand particles used for the secondary processing may be applied to the acrylic sheet 40 secondarily processed by the tertiary injection device (not shown). Sand particles of ~ 400 mesh) can be processed once more. In this case, it is possible to obtain higher quality output light by adjusting the wind strength and the density of the sand particles of the

blowers

36 and 38 so as to achieve the desired maximum efficiency light guide plate conditions with the sand particles.

On the other hand, the processing method described above is a method of spraying the sand particles of the large size and the sand particles of the small size in order to spray sequentially, but by modifying the two or three kinds of sand particles of different sizes are mixed together and sprayed at once You can do it. It is preferable that the sand particles to be mixed have a size difference of at least twice. In addition, in the mixing ratio, for example, when sand particles of two sizes are mixed, it is preferable to mix sand particles of large size and small size in a ratio of 1: 1 to 1: 4. In the case of mixing sand particles of three sizes, a mixing ratio of large size (e.g. 100 mesh): medium size (e.g. 150 mesh): small size (e.g. 200 mesh) is 1: 1: 1.5 to 1: 1.5. It is preferable to mix differently according to the process size of a light guide plate in the range of the ratio of: 2.5.

Even if the acrylic plate 40 is processed in this manner, various light scattering characteristics of the processed acrylic plate (light output efficiency, luminance uniformity, softness of output light, spreading angle of output light) are compared with processing of single size sand particles. Etc.) is obtained better. However, the method of spraying a mixture of sand particles of different sizes at the same time has a disadvantage that it is difficult to control the intaglio density for each light guide plate when the size variation of the mixed sands is large. In addition, the intaglio formed by the small-size sand particles first may be lost by the intaglio formed by the large-size sand particles colliding later, and the number of small intaglios formed on the inner surface of the large-size intaglio is relatively large. As a result, the light scattering properties of the processed acrylic sheet may be inferior to that of the multi-stage process.

The method of sequentially processing each size separately as described above improves flatness because the processing conditions can be controlled separately. Mixed sand particles may also be used in the process of dividing into two or three orders. When the light guide plate is large (1000 mm or more in width), mixing particles provides better light efficiency and flatness control. At this time, the mixing ratio or particle size of the sand particles should be adjusted according to the surface strength of the material. However, if the width is less than 1000 mm, effective results can be obtained by only the first and second sand sprays without mixing the sand particles.

(d) On the other hand, the light source module 220 uses the LED 222 as a light source lamp. One light source module 220 may include dozens or about one to two hundred LEDs 222 according to the size of the surface lighting device. The LEDs 222 constituting the light source module are mounted on the strip-shaped printed circuit board 224. The light source module 220 may be made to be evenly distributed (directly formed) on the bottom surface of the light guide plate 210, but has a disadvantage in that a diffusion film is used and the thickness becomes thick. More preferably, the LEDs 222 may be disposed (edge type) to be in contact with the corresponding side surface at least on one side or all sections of the light guide plate 210. In the edge type, the light source module 220 is accommodated in the light source module storage unit 237 provided in the body frame 232. The printed circuit board 224 preferably has a width corresponding to the height of the light source module storage unit 237 and has a strip shape having the same length as the side surface of the light guide plate 210 on which the light source module 220 is disposed. Even when the side of the light guide plate 210 is curved, the printed circuit board 224 may be made of a flexible material so that the LED 222 may be in close contact with the side of the light guide plate 210. The printed circuit board 224 is provided with an input terminal connected to the output terminal of the converter 140 through the wire 125, and a wiring circuit connecting the LEDs 222 to the input terminal. The input terminal is preferably provided in the form of a plug-type input terminal that can be connected to the terminals of the connector 127 of the wire 125. In the case of the rectangular LGP 210, the light source module 220 may be disposed on one side, on two opposite sides, or on four sides of the rectangular light guide plate 210.

In configuring one light source module 220, all the LEDs 222 may be configured in parallel one by one, but in order to simplify the wiring on the printed circuit board 224, the entire LEDs 222 may be grouped in groups. It is preferable to perform parallel connection between groups and LED 222 in the same group to be connected in series. One LED 222 lamp has a low voltage direct current of, for example, about 1.4V to about 5V, depending on its type. For example, in the case of performing a series-parallel connection by grouping 8 LEDs each having a 3V operating voltage, a DC voltage of 24V may be supplied to each group. Therefore, the converter 140 may theoretically provide the wiring circuit with a DC voltage of 24V corresponding to the sum of the operating voltages (3V) of all LEDs belonging to the same group. As described above, the DC voltage supplied by the converter 140 to each of the surface lighting devices is a low voltage at which the wires do not need to be wired inside the metal conduit according to electrical safety laws. If the number of LEDs connected in series is too low, the terminal LED takes a low voltage due to the voltage drop, so it is preferable to limit the number of LEDs connected in series to about 10 or less.

(e) frames

Frame 230 of the light guide plate 210 is built so that at least one side of the light guide plate 210 is in contact with the LED lamps 222 of the light source module 220 so that the light source module 220 is not exposed to the outside. It acts like a picture frame or picture frame that holds the edges to maintain the overall shape. As a result, the light source module 220 and the light guide plate 210 are in close contact with each other. Frame 230 is preferably made of a material having good strength, light weight, and high thermal conductivity (eg, aluminum or an aluminum alloy based thereon).

In order to check or replace the light source module 220, the frame 230 is configured as a cover opening and closing structure that is easy to remove or reassemble the light source module 220 when necessary. The frame 230 may have a structure including a body frame 232 that can be fixed by mounting the light guide plate 210 and an openable cover frame 234 that is rotatably coupled to the side of the body frame 232. . The body frame 232 may have a width in which an edge portion of the light guide plate 210 may span, and may have a closed ring shape (eg, when the light guide plate 210 is rectangular, the body frame 232 may have a rectangular ring shape).

For quick heat dissipation, the body frame 232 has a plurality of heat dissipation wings 232-2 protruding from the bottom, and the C-groove-shaped light source module accommodating part 237 is formed along an approximately center portion of the upper surface. To be prepared. The light source module 220 is accommodated in the light source module storage unit 237 so that the LED lamps 222 are exposed. The light guide plate 210 has an edge portion mounted on the body frame 232, and an edge portion thereof is inserted into the light source module storage portion 237. The gap between the upper portion of the light source module accommodating part 237 and the edge end portion of the light guide plate 210 is interposed with a packing member 250 for fixing the film / light guide plate made of an elastic material such as rubber or urethane. As a result, the light source module 220 and the light guide plate 210 are fixed to the body frame 232.

The cover frame 234 is pivotally engaged with the ends 234-1, 232-1 of the body frame 232. One or more elastic members 236 are interposed between the predetermined portion of the body frame 232 and the engaging portion 234-2 protruding from the inner surface of the cover frame 234. One or more elastic members 236 use the body frame 232 as a scaffold to push the cover frame 234 away from the ends 234-1 and 232-1. The pushing force does not release the cover frame 234 from the ends 234-1 and 232-1 at any position. In addition, since the elastic member 236 provides a force for maintaining the state once the cover frame 234 is in the closed state, the light guide plate 210 has its edge portion pressed against the cover frame 234. The closed state is maintained without departing from the frame 230. In this way, the light guide plate 210 is fixed by the light source module storage unit 237 and the cover frame 234 double.

The empty space at the four corners, which are the boundary points of the four cover frames 234, is finished by inserting the corner bracket 244. In addition, the four body frame 232 is coupled to each other using a fixed frame 246 at four corners.

(f) means of attachment

The frame 230 is provided with attachment means for attaching the surface lighting device 200 to the ceiling finisher 14. Attachment means is configured to ensure the installation position mobility of the surface lighting mechanism (200). For example, as shown in FIG. 14, coupling holes (not shown) may be provided at various locations (eg, four corners) along the circumference of the body frame 232 to allow the screw 239 to be coupled thereto. Insert screw (239) into the coupling hole can be fixed to the ceiling finishing material (14), and if necessary, simply loosen the screw if the ceiling finishing material (14) without leaving any scratches on the surface lighting fixture (200) You can move the position separately. As another example, when the ceiling finishing material supporting member such as M-bar or T-bar is made of a metal body to which a magnet can be attached, the attachment means is fixed along the circumference of the frame 230. May be a plurality of magnets 242. Magnet 242 may be provided with screws 239.

(g) other

In order to prevent scratching of the light guide plate 210, a protective film 248 may be added on the light guide plate 210. In addition, for decoration, a transparent film 240 printed with a desired picture, text, or the like may be further added to the upper surface of the light guide plate 210. In this case, the decorative film 240 may play a role as a protective film. The protective film 248 or the transparent film 240 is inserted between the light source module accommodating part 237 and the light guide plate 210 and the film / light guide plate fixing packing member 250 is inserted into the edge portion.

In the surface lighting device 200 having such a configuration, when commercial AC power is converted into DC power required for driving the LED lamps 222 by the converter 140 and provided to each LED lamp 222, each LED Lamps 222 emit light. Light of the LED lamps 222 is introduced into the light guide plate 210 through the side surface, and scattered and reflected by light scattering elements formed on the bottom surface of the light guide plate 210 and exits through the top surface of the light guide plate 210. As a result, the light guide plate 210 acts as a light source for surface emitting light.

The table below is an exemplary specification of the surface lighting device 200 that can be made using the LED light source module 220 as an edge-type light source, the thickness can be made to about 100 [mm].

Table 1

Light guide plate width x length [mm]	Light module length [mm]	Number of light modules	Power Consumption [W]	Weight [Kg]	Other
330 x 330	274	2	2.0	0.8	LED thickness [mm] 9.13
620 x 330	48	2	24.0	1.3
1170X330	1096	2	50.0	2.3

(3) the surface lighting mechanism 300 according to the second embodiment

Since the LED surface lighting mechanism 110 is attached to the ceiling finishing material, it is desirable to be designed to further reduce the thickness and weight and to vary the shape. LED surface lighting mechanism 300 according to the second embodiment is characterized in that the shape of the light guide plate can be made various, and the weight and thickness are reduced by configuring the frame in an unopened type to satisfy this requirement. The following description will focus on differences from the first embodiment.

15 shows various examples of the LED surface lighting fixture 300 according to the second embodiment. LED surface lighting mechanism 300 according to the present invention is characterized in that it can have any shape without any limitation on the shape. That is, the LED surface lighting mechanism 300 is circular arc type 300a, circular 300b, land track type 300c, fan-shaped (baseball field) 300d, rectangular 300e, Taegeuk as illustrated in FIG. Some sections of the edges (sides) may be curved or at least some sections may be curved, such as a pattern 300f, a star, and a donut.

The LED surface lighting apparatus 300 may include a light guide plate 310 cut in a desired shape, a light source module 320 in close contact with at least a portion of a side surface thereof, and at least an edge portion of the light guide plate 310 and the light source module 320. It includes a frame 330 that holds and holds the overall shape of the surface lighting device while holding and holding the light source module 320 with respect to the side surface of the light guide plate 310. Some or all of the frame 330 is preferably made of a light material with good thermal conductivity. The thermally conductive material is partially exposed to the outside air and the other part is in direct contact with the light source module 320 to serve as a heat sink to dissipate heat generated from the light source module 320 to the outside air.

The light guide plate 310 differs from the first embodiment only in that its shape is not limited. It is more preferable to cut the acrylic resin sheet using a laser cutting method or a computerized numerical control (CNC) processing method with good precision and productivity. The surface lighting device 300 may be made of a bidirectional light emission type or a unidirectional light emission type. In order to construct a unidirectional light-emitting surface lighting apparatus, a light reflection sheet 312 is attached to a bottom surface of the light guide plate 310 on which light scattering elements are formed (see FIGS. 16, 17, 19, and 20). Then, light incident on the side of the light guide plate is emitted only to the upper surface. However, if no obstacle that interferes with outgoing light is disposed on both surfaces of the light guide plate 310 without attaching the light reflection sheet 312, the light guide plate 310 emits light in both directions (see FIG. 18).

The light source module 320 may be disposed in the entire section of the side surface of the light guide plate 310 according to the required brightness level, but may be disposed only in some sections. 15B and 15C show a case in which the light source module 320 is disposed in all sections of the light guide plate, and FIGS. 15A, 15D, 15E and 15F show side surfaces of the light guide plate. Illustrates the case where the light source module 320 is disposed only in some sections. A light reflecting tape (not shown) is attached to the other side section in which the light source module 320 is not disposed so that light does not leak out.

16 to 20 show the light source module 320 in the various

surface lighting apparatuses

300a, 300b, 300c, 300d, 300e, and 300f of FIG. 15 representing the identification number '300'. Sectional drawing which shows the various examples of the cross-sectional structure seen from the cutting line AA about the side section arrange | positioned.

First a first example is shown in FIG. 16. According to FIG. 16, the light guide plate 310 and the light source module 320 closely disposed on the side surface of the light guide plate 310 are sandwiched between the upper cover portion 332 and the lower cover portion 334 of the frame 330 to maintain a stable coupling state. . The light source module 320 is a flexible circuit board (eg, a flexible printed circuit board (FPCB)) or a film type circuit board having good flexibility, and a printed circuit board made of a width approximately equal to or slightly larger than the thickness of the light guide plate 310 ( 322 and a plurality of LEDs 324 mounted thereon and connected to the driving circuit. The upper cover portion 332 and the lower cover portion 334 of the frame 330 is made of a thin plate-like shape similar to the light guide plate 310, the edge portion of the light source module 320 and the light guide plate 310 in close contact therewith. Wrap the top and bottom of the sandwich. In addition to the basic role of stably maintaining the overall shape of the surface lighting device 300, the frame 330 may also serve as a heat sink that receives heat generated from the light source module 320 and quickly releases it to the outside air. . To this end, the frame 330 further includes a side support portion 336 made of a metal having excellent thermal conductivity and flexibility, for example, aluminum or an alloy based on it, copper or an alloy based on it. The side support portion 336 is also in close contact with the back surface of the circuit board 322 of the light source module 320 and is also bonded to the upper cover portion 332 and the lower cover portion 334 (heat transfer efficiency at the bonding surface) Thermally conductive double-sided tape to increase). As a result, the side support 336 takes heat generated from the light source module 320 and directly radiates it to the outside air, or transfers the heat to the at least one of the upper cover part 332 and the lower cover part 334 through the heat conduction method. Allow it to emanate to the outside air. The side support part 336 extends at least the length of the light source module 320 and is formed by bending a bar made of a metal bar having good flexibility and thermal conductivity, for example, aluminum having a cavity 337 formed therein along the length direction. can do. The reason why the cavity 337 is formed in the metal rod in the longitudinal direction is that when the straight metal rod is bent to the curvature of the curved side section to form the side support 336, the metal rod without the cavity 337 This is because the surface of the surface is pushed outward and the flatness of the surface becomes worse. The poor surface may cause poor heat transfer efficiency of the side support part 336 to the bottom cover part 334, resulting in overheating of the light source module 320. The side support part 336 may be installed to surround the entire side surface of the light guide plate 310 as well as the side section in which the light source module 320 is disposed. In this case, both ends of the metal bars of the side support 336 may be connected to each other by driving connection pins in the cavity 337 or the gap.

At least one of the upper cover part 332 and the lower cover part 334 has a high thermal conductivity and a light metal (eg, aluminum) to act as a heat sink that quickly dissipates heat generated from the light source module 320 to the outside air. Alloy, copper or copper alloy). In the case of Figure 16, the upper cover portion 332 is made of a transparent plastic resin plate material and the lower cover portion 334 is made of aluminum plate material, the shape of these (332, 334) is similar to the light guide plate 310 and the size is Even though the entire light guide plate 310 is covered, the size of the light guide plate 310 slightly protrudes outward. Since the lower cover portion 334 is of sufficient size, even if the thickness is sufficiently thin, it is possible to stably hold the overall shape of the surface lighting mechanism while having sufficient heat dissipation rate. Since the upper cover part 332 is transparent, the concealing film 342 which hides the side support part 336, the light source module and the edge portion of the light guide plate in contact with the front surface is bonded to the inner surface of the upper cover part 332. .

The first and

second spacers

339a and 339b are inserted into the sandwich between the both sides of the edge portion of the light guide plate 310, the top cover part 332, and the bottom cover part 334 so that the frame 330 is disposed on the light guide plate 310. It is desirable to be able to hold the edge of the edge more firmly. It is preferable that the first and

second spacers

339a and 339b have a slight elasticity. However, the second spacer 339b may be made of a thermally conductive metal and one end thereof may be disposed in contact with the side of the LED 324. In this case, since the second spacer 339b directly extracts heat from the LED 324 which generates the most heat and transfers the heat to the cover part 334, the second spacer 339b may contribute to increasing heat dissipation efficiency.

Next, the surface lighting mechanism shown in FIG. 17 is characterized in that it further includes a side decoration member 338 for adding decorativeness to the side of the surface lighting apparatus as compared to FIG. The side decorative member 338 is disposed on the rear surface of the side support portion 336 disposed on the rear surface of the light source module 320 and a part thereof is sandwiched between the upper cover portion 332 and the lower cover portion 334 and It is bonded (with double-sided tape 335 or adhesive) and the remaining part is exposed outward. By the color, shape, and texture of the exposed part, the surface lighting device can produce a harmonious and luxurious atmosphere as a whole. The side support portion 336a may have the same effect as the cavity 337 is provided even if the side support portion 336a is formed in a U shape having a gap 337a provided in the center portion as shown in FIG. 17 instead of the cavity therein.

In addition, in order to maximize the heat transfer efficiency from the light source module 320 to the side support portion 336, the lower cover portion 334, the upper cover portion 332, the gap between the light source module 320 and the frame 330, in particular The thermally conductive grease 344 may be filled to surround the side surface of the LED 324 in the gap between the member made of the thermally conductive metal and the light source module 320. As a result, heat generated from the LED 324 is directly transmitted to the bottom cover portion 334 serving as a heat sink through the thermal conductive grease 344.

Next, the surface lighting mechanism 300 shown in FIG. 18 is a bidirectional light-emitting type in comparison with that of FIG. 17, and both the top cover portion 332a and the bottom cover portion 334a serve as heat sinks. The difference is that it is made. These outer surfaces have surface structures (e.g., corrugated surfaces, surfaces with a large number of radiating fins, uneven surfaces, etc.) for maximizing heat dissipation surface area. Since the top cover part 332a is an opaque metal, the concealment film 342 is not necessary, but only the edge of the light guide plate 310 should be covered and the inside thereof should be exposed. In this case, it is preferable to cover and protect the remaining surface of the light guide plate not covered by the top cover part 332a by covering the transparent protective film 340 on the front surface of the light guide plate 310. In addition, the bottom cover portion 332a also covers only the edge portion of the light guide plate 310 without covering the entire rear surface thereof. Like the upper surface, a protective film 340 may be added. The finish of the side of the surface lighting fixture of FIG. 18 may be the same as that of FIG. 17 or as shown in FIG. 16 as shown. In order to make the surface lighting apparatus of FIG. 18 unidirectional light emission type, a light reflection sheet 312 may be added to the lower surface of the light guide plate 310 instead of the protective film 340.

The side support part 336 and the bottom cover part 334 made of a thermally conductive metal may be made into separate members as described above, and may be joined when assembling the surface lighting apparatus 300, but may be made of a single member integrated with molding. will be. 19 shows a cross-sectional configuration of this example. In FIG. 19, the upper cover part 333 is characterized in that the upper cover part 332 and the side support part 336 of FIG. The upper side cover part 333 is bonded to the bottom cover part 334 while covering the light source module 320 in close contact with the side surface of the light guide plate 310 while covering the edge portion of the light guide plate 310. Bonding may be performed by using an adhesive or a double-sided tape 335, or as shown in the drawing, a hole penetrating the upper cover portion 333 and the lower cover portion 334 and tightened with a bolt-nut 346. Will be able to bond. Since the upper side cover portion 333 is in direct contact with the light source module 320, it is preferable to make the metal having good thermal conductivity. The lower cover part 334 is made of a light plastic resin plate or a metal having good thermal conductivity.

20 shows an example of another cross-sectional structure of the surface lighting mechanism 300, and FIG. 21 is an exploded perspective view showing the configuration of an arc-shaped surface lighting mechanism 300a having such a cross-sectional structure. The light guide plate 310 has a shape in which the arc angle of the arc is approximately 90 degrees or less, and the lower cover part 334 resembles the light guide plate 310 but has a larger size, and the upper cover part 332 has a lower cover part ( 334 is the same shape and size, but covers only the edge portion of the light guide plate 310 and the light source module 320 and the inner portion of the upper surface of the light guide plate 310 from which light is cut out. The side decoration member 338 has a shape larger than that of the light guide plate 310, but the center portion of the side decoration member 338 is formed to receive and surround the light guide plate 310. In addition, the top and

bottom cover parts

332 and 334 and the side decorative member 338 have bolt insertion holes 352 to fix the surface lighting mechanism 300a to the ceiling finisher 14 with the bolt 350. To be prepared. The upper inner part of the light guide plate 310 is covered with a protective film 340. The top cover portion 332 and the bottom cover portion 334, both or one of which is made of aluminum plate so as to serve as a heat sink. The light source module 320 is disposed on the side surface of the light guide plate 310, for example, an outer arc and / or an inner arc. The side support part 336 is cut in a shape similar to the top cover part 332 to sandwich the side surface of the light guide plate 310 and the light source module 310 while sandwiching between the top cover part 332 and the bottom cover part 334. do. The circuit board 322 of the light source module 320 is connected to the driving power supply wire 348, and a connector is provided at the end of the wire 348 so that the surface lighting apparatus 310 can be connected to the power source even if the electrician is not an electrician. 349 are connected.

2. Construction method of the surface lighting system (100)

The construction method of the surface lighting system 100 according to the present invention has a great feature in that the

surface lighting apparatuses

200 and 300 can be installed after the ceiling finishing material construction is completed in the interior space of the building.

FIG. 22 is a diagram for explaining the installation of the surface lighting system 100 employing the surface lighting mechanism 200 of the first embodiment. First, the LED surface lighting apparatus 200 is attached to the surface of the ceiling finisher 14 in a desired layout without removing the ceiling finisher 14 using the attachment means described above. As illustrated in the above example, the illumination controller 130 is employed, and the eight LED lamps 222 of the light source module 220 are grouped by eight so that the eight LED lamps 222 in the same group are connected in series. Are connected in parallel, and if the operating voltage of each LED lamp 222 is 3V, the input terminal of the light source module 220 should be DC 24V, so the converter 140 may employ a SMPS having a 24V output voltage. In the case of introducing the illuminance controller 130, it is disposed between the converter 140 and each surface lighting mechanism 200.

In the case of a lighting device using commercial AC power (such as 110V or 220V) according to building codes, the AC wire 125 should be embedded in a metal conduit, but the present invention does not need to be. From the outlet 150 to which the commercial AC power is provided, the converter 140 is connected to the AC wire 145, the converter 140 to the illumination controller 130, and the illumination controller 130 each surface lighting device ( Up to 200 is connected to the DC low-voltage (24V) wire 125. The DC low voltage wire 125 does not need to be embedded in a conduit (not shown) at the time of wiring. This is because the converter 140 is separated from the surface lighting apparatus 200 and installed at a location easily accessible near the outlet 150 through which the AC power is input.

In consideration of the convenience of construction work, only the surface lighting fixtures 200 are attached to the ceiling finishing material 14, the converter 140 and the illumination controller 130 are easily reachable by the user's hand (for example, the illumination controller 130) Is installed on the wall of the indoor space, and the converter 140 is preferably installed on the wall or the floor of the indoor space. The DC terminal 125 and the input terminal 226 of the printed circuit board 224 of each LED surface lighting device 200 may be connected to each other by fitting a connector.

All the surface lighting devices 200 are all connected in parallel so that the output voltage of the converter 140 is commonly supplied to each surface lighting device 200. T-type branch box 120 can be used to effectively parallel connection. The wiring path of the electric wire 125 includes a ceiling section extending from the ceiling finishing material 14 to each surface lighting device 200. In this ceiling section, the electric wire 125 is fixed to the outer surface (bottom surface) of the ceiling finish material 14 or the mains electric wire which is wired in a form that is laid on the concealed upper surface (top surface) of the ceiling finish material, The branch box 120 is installed in the middle, and the branch box 125 includes a feeder wire 125 which is extracted from the branch box 125 and connected to a nearby surface lighting device 200.

For example, a flexible flat cable (FFC) may be used as the DC wire 125 connecting the converter 140 to each surface lighting device 200. Flexible flat cables consist of multiple metal conductors bonded to the surface of a thin, flat, flexible plastic film. The pitch of the FFC varies from 0.5mm to 2.54mm, with 0.5mm and 1.0mm being the most commonly used. The end of this cable ends with connector 226. The FFC is wired without being embedded in the conduit. Using the FFC and the T-type branch box 120 also has the advantage of being able to flexibly respond to changes in the installation position of the surface lighting mechanism (200).

The wiring of the electric wire 125 may be installed in a form of pulling only the electric wire 125 without being embedded in the protective metal conduit. When the direct current wire 125 is dragged across the ceiling finisher 14 to each of the surface lighting fixtures 200, and attached to the exposed outer surface (bottom) of the ceiling finisher 14 (exposed wiring). Or it can be installed in a form (cloaked wiring) just put on the unexposed inner surface (upper surface) of the ceiling finishing material (14). In the case of exposed wiring, it is necessary to select the colors and fastening means of the FFC that are well harmonized with the fixed bodies (walls and ceiling finishes) so as not to bother aesthetically. For example, using wires made in the form of tape, and fixing them with the same color or color as that of the wall and ceiling finishes 14, or fixing them with fixing pins or nails, or attaching them to the outer surface along the boundary of the ceiling finishes. One way would be to install it. The wire 125 may be wired by using an installation auxiliary means such as a plunger or a flexible flame retardant cable tube, but this is different from the metal conduit according to the conventional method considering electrical safety because it is considered aesthetics. In the case of the concealed wiring, the ceiling finishing material that comes in contact with the wall of the already installed ceiling finishing material 14 slightly pushes the wire 125 therein, and then drag the mainstream wire 125 in the desired path. Then, the branch box 120 is installed at the main wire 125, and the branch wire 125 is extracted from the main wire 125 to be connected to the nearby surface lighting apparatus 200. The location where the branch box 120 is installed, it is preferable that the location close to the location where the surface lighting mechanism 200 is to be installed. In this way, most of the wires 125 are placed on the ceiling finishing material 14, and only a part of the length is exposed at a point very close to the surface lighting device 200. If the mainstream wire 125 is installed on the outer surface of the ceiling finisher 14, the T-type branch box 120 may be installed on the surface of the ceiling finisher 14 bar or concealed on the ceiling finisher 14. When the mainstream wire 125 is placed on the ceiling finisher 14 to be concealed, it may be desirable to install the T-type branch box 120 also on the ceiling finisher 14 to conceal it. When the mainstream and / or T-shaped branch box 120 of the electric wire 125 is installed on the ceiling finishing material 14 to be concealed, the branch of the electric wire 125 is also concealed and installed on the ceiling finishing material 14 and the corresponding surface lighting. It may be pulled out and connected near the apparatus 200. It is not necessary to remove the ceiling finishing material 14 for the installation of lighting fixtures as in the prior art by installing either the exposed wiring or the concealed wiring.

According to this installation method, even after the construction of the ceiling finishing material is completed, even after the use of the interior of the interior space is determined and the layout according to the partition of the interior space, arrangement of the fixtures, etc., the installation of the surface lighting fixtures 200 It is possible to obtain the arrangement of the surface lighting device 200 that is most suitable for the conditions of the corresponding indoor space and is highly efficient when installed in such an order.

In addition, only the LED surface lighting device 200 is attached to the ceiling finisher 14, and even if the converter 140 is installed at a position spaced apart from and accessible to people, the DC electric wire 125 (for example, FFC) Wiring work is very simple, so the burden of wiring work is not big. Compared with the existing wiring work that supplies commercial AC power to the lighting fixture, the construction time can be greatly shortened, and the material required for wiring can be greatly reduced, thereby significantly reducing the construction cost. Since the direct current cable 125 and the surface lighting device 200 are connected to the connector 149, installation and maintenance are easy. If the circumstances change after installation of the surface lighting mechanism 200, it is also easy to move the installation position to another place. In addition, among the components of the surface lighting system 100, the highest probability of failure is the converter 140 and the illumination controller 130 having a circuit, and because of the good accessibility thereof, the maintenance of the surface lighting system 100, Maintenance is relatively easier.

Furthermore, even if the lighting scheme of the corresponding indoor space is changed due to the change of circumstances, it is possible to flexibly and easily change the arrangement position of the surface lighting apparatuses 200 accordingly. To change the position of the surface lighting device 200, first, the feeder wire 125 connected to the surface lighting device 200 to be moved is separated from the surface lighting device 200, and then the surface lighting device 200 is suspended from the ceiling finishing material ( 14). The next procedure is to follow the installation procedure for the surface lighting equipment described above. That is, by extracting the branch of the electric wire 125 near the moving installation position and installing the surface lighting mechanism 200 at the position, and connecting the branch of the electric wire 125 previously extracted to the surface lighting mechanism 200, The position change is complete.

The installation of the surface lighting mechanism 300 according to the second embodiment is also not different from the first embodiment. It can also be attached to the ceiling or wall or suspended from a pole. In particular, the surface lighting apparatuses 300 according to the second embodiment may be installed in various patterns by various shapes and appropriate combinations thereof, as illustrated in FIG. 23. As shown, there are a wide variety of layouts that can be constructed. In particular, it is possible to construct a wave shape, a pinwheel shape, a ripple shape, etc. which cannot be produced by the existing polygon surface lighting apparatus. In the installation according to each layout, it is possible to install each of the surface lighting fixtures 300 by attaching them directly to the ceiling finishing material separately, as shown in Figs. 23 and 24 to select and install the desired surface lighting fixtures 300 After installing the surface lighting fixture set in advance by installing the desired layout on the plate member 400, the mounting plate member 400 may be fixed to the ceiling finisher 14 to install the surface lighting fixture set at the same time. By installing in this latter manner, the surface lighting mechanism 300 can be installed more efficiently and accurately. In addition, there is also an advantage that can be added to the entire decoration surface lighting fixture set using the mounting plate 400.

The present invention can be widely used to newly install the indoor lighting of a new building or to replace the existing indoor lighting.

Claims

As a surface lighting system installed on the ceiling of the interior space where the installation of the ceiling finish material is completed,

Light generated by a plurality of LEDs mounted on a strip-shaped printed circuit board, which is detachably attached to a desired position on the lower surface of the ceiling finishing material without removing the ceiling finishing material, is printed with a wiring circuit to which a DC voltage is applied, One or more surface lighting apparatuses configured to be scattered and reflected by light scattering elements which are incident on the bottom surface and are emitted to the top surface;

Installed at a position spaced apart from the one or more surface lighting apparatuses, and receives a commercial AC voltage to convert the DC voltage necessary for driving the plurality of LEDs of each of the surface lighting apparatuses to the one or more surface lighting apparatuses. A converter providing the DC voltage in common with respect to the DC voltage; And

An electric wire for electrically connecting in parallel from the converter to the one or more surface lighting apparatuses so that the DC voltage of the converter is provided to an input terminal of the wiring circuit of each of the one or more surface lighting apparatuses, the necessary portion of the wiring path Surface lighting system comprising a DC low-voltage wire that is fixed by using a fixing means but not embedded in a separate metal conduit.
The surface lighting apparatus of claim 1, further comprising: attachment means for detachably attaching the ceiling finish material to a desired position on a lower surface of the ceiling finish material without removing the ceiling finish material; The wiring circuit is printed and a plurality of LEDs are arranged in a stripe shape extending to the printed circuit board to be connected to the wiring circuit, and the plurality of LEDs emit light by a DC voltage provided to an input terminal of the wiring circuit. A light source module adapted to; Fine engravings are formed on the bottom surface as the light scattering element, and at least a part of the side surface is in close contact with the plurality of LEDs of the light source module, and the output light of the plurality of LEDs incident through the side surface is scattered and reflected. A light guide plate made of a transparent acrylic plate for emitting light; And a frame configured to receive and integrate the edge of the light guide plate while accommodating the light source module to be in close contact with the side surface of the light guide plate.
The frame of claim 2, wherein the frame comprises: a body frame having a width capable of supporting the edge circumference of the light guide plate and forming a ring shaped like the edge circumference of the light guide plate; A cover frame whose one end portion engages with the body frame and is pivotally coupled to the body frame with the engaged portion as the pivot axis; The cover frame is positioned between the body frame and the cover frame and the cover frame is pushed in a direction away from the pivot axis by using the body frame as a scaffold to maintain an engagement state between the cover frame and the body frame. An elastic member that maintains its state when it is at and provides an elastic force that prevents the light guide plate from being separated; A light source module accommodating part configured to receive a light source module along a length direction of the body frame and to receive at least a portion of an edge of the light guide plate; A packing member inserted into a gap with the light guide plate in the light source module storage part to stably hold an edge portion of the light guide plate; And at least one of a plurality of screw fixing holes and a plurality of magnets provided at a plurality of positions of the body frame, wherein the light guide plate includes the light source module accommodating part, the packing member, the cover frame, and the elastic member. The surface lighting system, characterized in that is supported by a double hold.
The surface illuminating device according to claim 1, wherein the surface lighting device is made of a transparent acrylic plate, has an arbitrary shape as desired, and at the bottom, fine engravings are formed as the light scattering element, and a part or the entire section of the side surface is a curved side surface. Light guide plate; And a printed circuit board having a plurality of LEDs mounted in a row, the plurality of LEDs grouped by a predetermined number, and having a wiring circuit for connecting the LEDs of the same group in series and connecting the groups and the groups in parallel. A light source module in which LEDs are closely arranged along a part or the entire section of the side surface of the light guide plate; And a top surface of the light source module and a top edge portion of the light source module and the light guide plate and a bottom edge portion or all of the bottom surface of the light guide plate to be sandwiched and joined to each other to cover the light source module while hiding the light source module. Maintaining a close state, and a part or the whole is made of a thermally conductive metal and the portion made of the thermally conductive metal comprises a frame configured to take the heat of the light source module and act as a heat sink to radiate to the outside air Lighting system.
The light emitting device of claim 4, wherein the frame comprises: a side support part disposed in close contact with a rear surface of the circuit board of the light source module so as to sandwich the light source module with a side surface of the light guide plate; And a top cover part and a bottom cover part joined to the side support part while covering the top and bottom edge parts of the light guide plate, the bottom edge part, the light source module, and part or all of the side support parts from above and below to sandwich. Lighting system.
The method of claim 5, wherein the upper cover portion and the lower cover portion is made of a plastic resin plate and an aluminum plate, respectively, wherein the side support portion extends at least the length of the light source module and there is a gap or gap in the longitudinal direction therein When the side support is installed to wrap the entire side surface of the light guide plate, the side lighting system is characterized in that the connecting pin is connected to the cavity or the gap.
The frame of claim 5, further comprising a side decorative member positioned behind the side support and sandwiching a portion between the top cover part and the two bottom parts of the bottom cover part to protrude outward. Surface lighting system.
The method of claim 1, wherein the attachment means (i) a plurality of coupling holes provided in the frame, a plurality of screws to be nailed to the ceiling finishing material through the coupling holes or (ii) a magnet fixed to the frame can be attached And at least one magnet for providing a magnetic force to attach the surface lighting mechanism to the metal ceiling finish support member.
The wire route of claim 1, wherein the wiring path of the wire includes a ceiling section extending from the ceiling finish material to each surface lighting device, wherein the wire is fixed to an outer surface (bottom surface) of the ceiling finish material, or A mainstream wire that is wired in a form that is placed on the concealed upper surface (top surface) of the ceiling finish material, and one or more branch wires that are separated from a branch box installed in the middle of the mainstream of the wire and extend to the respective surface lighting devices Surface lighting system comprising a.
The apparatus of claim 1, further comprising an illumination control unit disposed between the converter and the surface lighting apparatuses to control the illumination of the surface lighting apparatuses by varying electric power supplied from the converter to the surface lighting apparatuses. Surface lighting system.
The surface lighting system according to claim 1, wherein the electric wire is a flexible flat cable for direct current (FFC), and an end of the electric wire and an input end of the wiring circuit are finished with connector terminals to form a connector connection with each other.
The light scattering element formed on the bottom surface of the light guide plate comprises: a plurality of first intaglios having a shape that is not uniform throughout the bottom surface and small enough to be hardly discerned by the naked eye; A plurality of second intaglios having a smaller shape and a non-uniform shape are mixed, wherein at least some of the first intaglios have at least some of the second intaglios formed therein. It is a multi-engraved structure of the surface illumination system, characterized in that the remainder of the second intaglio is formed in a region where the first intaglio is not formed on the bottom surface.
The surface illumination system of claim 12, wherein the light scattering elements scatter and reflect light incident to a side of the light guide plate to output light having an optical spread angle of 130 to 170 degrees to an upper surface of the light guide plate.
The apparatus of claim 1, further comprising at least one attachment plate fixed to a desired position of the ceiling finishing material, wherein at least a portion of the at least one surface lighting fixture is disposed and fixed to a desired layout in each of the at least one attachment plate. A surface lighting system characterized by the above.
The converter of claim 1, wherein the wiring circuit groups the plurality of LEDs mounted on the printed circuit board into groups so that the LEDs in the same group are connected in series and the groups and groups are connected in parallel. And provides a direct current voltage corresponding to the sum of operating voltages of all LEDs belonging to the same group to the wiring circuit.
As a method of constructing a surface lighting system in the interior space of the ceiling finishing material installation work,

Light generated by a plurality of LEDs mounted on a strip-shaped printed circuit board on which a DC circuit is applied is incident to the side of the light guide plate and scattered and reflected by light scattering elements formed on the bottom of the light guide plate to be emitted to the upper surface. Detachably installing one or more surface lighting fixtures at a desired position on the lower surface of the ceiling finish without removing the ceiling finish;

A converter that receives a commercial AC voltage and converts the DC voltage required for driving the plurality of LEDs of each of the surface lighting devices to provide the DC voltage in common to the one or more surface lighting devices. Installing at a location spaced from the luminaires; And

A wire wiring step for electrically connecting the DC voltage of the converter to the one or more surface lighting devices in parallel with a DC low voltage wire so that the DC voltage of the converter is provided to an input terminal of the wiring circuit of each of the one or more surface lighting devices. Including;

In wiring the DC low voltage wire, the wire is fixed to a required portion on the wire path by means of fixing means and is not embedded in a separate metal conduit, and the wire path of the wire crosses each surface across the ceiling finishing material. A ceiling section leading to a luminaire, wherein the wire is attached to an outer surface (bottom) of the underside of the ceiling finish or wired on a concealed upper surface (top) of the ceiling finish. Surface lighting system installation method characterized in that.
17. The method of claim 16, wherein the wire wiring step comprises the steps of: installing a mains cable up to near the surface lighting apparatus located farthest from the converter; And extracting a branch from the mains electric wire by using a branch box and connecting the branch light to each of the surface lighting devices.
17. The method of claim 16, wherein the installation of the one or more surface lighting fixtures is arranged in such a way that the one or more surface lighting fixtures are fixed to the one or more attachment plates in a desired layout and then the attachment plate is fixed in a desired position of the ceiling finish. Surface lighting system installation method characterized in that made.
17. The surface lighting system of claim 16, wherein the electric wire is a flexible flat cable for direct current (FFC), and an end of the electric wire and an input end of the wiring circuit are closed by a connector terminal and connected to each other by a connector connection method. Way.
17. The method of claim 16, further comprising installing an illuminance adjuster for adjusting illuminance between said converter and said at least one illuminating device.