JP2017142984A - LED lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED lighting device which can uniformly radiate light with high illuminance, and which has excellent designability.SOLUTION: At one part of a rear surface of a diffusion plate 11, a reflection plate 15 is attached. The reflection plate 15 desirably comprises one of characters, figures and symbols, or a combination of these. The diffusion plate 11 is translucent, and in a state where an LED light source 23a is turned off, the reflection plate 15 is not visible from the outside. On the other hand, when the LED light source 23a is lighted, the light radiated from the LED light source 23a emits from a portion other than the portion on which the reflection plate 15 is attached.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an LED lighting device that can uniformly irradiate light with high illuminance and is excellent in design.

  Because of energy saving and long life, LED (Light Emitting Diode) illumination has become widespread, and many illuminations using LEDs have been proposed. As these illuminating devices, there is an illuminating device in which a light reflecting plate is disposed inside the frame of the illuminating device for the purpose of improving the illuminance of the illuminating device or for light diffusion, and the light is diffusely reflected and irradiated.

  For example, the light reflecting portion includes a first reflecting layer provided on the inner surface of the concave portion including the concave surface of the light source storage portion, and a second reflecting layer provided on at least a part of the inclined surface near the ridge line portion. The first reflective layer irradiates reflected light toward the entire back surface of the light diffusing plate, and the second reflective layer is outside the region between the straight tube portions of the linear light source on the back surface of the light diffusing plate. There is an illuminating device that irradiates reflected light toward an outer peripheral portion (Patent Document 1).

  Patent Document 1 discloses a reflecting sheet in which reflecting sheets are attached to two predetermined portions of a substantially U-shaped concave surface formed on a reflecting plate and case, and the light from each straight tube portion of a linear light source respectively corresponds to the reflecting sheet. Is reflected toward the predetermined two sides opposite to each other of the straight tube portions, that is, the concave portions for storing the light source, thereby making the illuminance uniform throughout.

  In addition, a transparent light guide plate having a light reflecting plate on the back surface and printed or molded with a pattern for uniform scattering of light on the surface, a light diffusing plate provided on the surface side of the light guide plate, and an end of the light guide plate There is a display device composed of a light source provided in a section and a transparent sheet depicting an object to be displayed provided on a light diffusion plate (Patent Document 2).

  Patent Document 2 provides a display device that is thin and has a curved surface by using a light guide plate that is a surface illumination device and a transparent sheet on which display contents are drawn. In this invention, a fluorescent lamp as a light source is provided at the end of the light guide plate, and a transparent sheet on which display contents are drawn is laminated on the surface having the light scatterer, thereby reducing the thickness of the entire apparatus. For this reason, the display content can be easily changed simply by replacing the sheet. Moreover, since the transparent sheet on which the display content is drawn can be laminated only by matching the light guide plate to the curved surface, the display device can be installed on the cylindrical surface.

  In addition, a pressure-sensitive adhesive layer is provided on a partial surface of a reflector such as a white film substantially corresponding to the side of the light guide plate that does not face the lamp, directly by screen printing or by a transfer method, to guide the light of the sidelight type backlight. A sidelight-type back mounted on a liquid crystal display panel, etc. in a state in which the reflective plate is fixed to a light guide plate such as an acrylic plate with an adhesive layer and a diffusion plate is stacked on the light guide plate. There is a light light guide structure (Patent Document 3).

  Patent Document 3 discloses a light guide reflector that does not require a double-sided adhesive tape and an inexpensive light guide by providing an adhesive layer on a partial surface of the reflector that substantially corresponds to the side that does not face the lamp of the light guide plate. A partial structure is provided. In this way, compared with a light guide unit structure in which a double-sided pressure-sensitive adhesive tape is attached to a reflector, a process for producing a double-sided pressure-sensitive adhesive tape is omitted, labor saving and cost reduction are provided, and an inexpensive light guide unit structure is provided. Can do.

Japanese Patent Laid-Open No. 08-076122 Japanese Patent Laid-Open No. 11-085073 Registered Utility Model No. 3039609

  However, the conventional lighting device attaches a micro-foamed resin sheet as a reflector to the back surface of the diffuser plate, so that the shape of the micro-foamed resin sheet emerges on the diffuser plate at the time of irradiation, and the diffuser plate has a design. It is not possible to uniformly irradiate light with high illuminance.

  This invention is made | formed in view of such a problem, and it aims at providing the LED illuminating device excellent in the designability which can irradiate light uniformly with high illumination intensity. Moreover, according to this invention, the illuminating device which can change the designability of a diffusion plate at the time of lighting and light extinction can be provided.

In order to achieve the above-described object, the present invention provides a frame having an opening, and a recess having a shape in which a horizontal cross section gradually expands toward the opening or the same cross-sectional shape. A diffusion plate covering the opening,
The frame is formed of a material having excellent light reflection characteristics, or an inner surface of the frame is provided with a resin coating having excellent light reflection characteristics, and an LED light source is disposed on at least a part of the recess, The LED lighting device is characterized in that a micro-foamed resin sheet is attached to a part of the back surface of the diffusion plate.

  It is desirable that the reflectance of the micro-foamed resin sheet of the reflecting plate satisfies the total reflectance of 95% or more and the diffuse reflectance of 95% or more, when the reflectance of the aluminum oxide standard plate is 100%. At least the total reflectance of 90% or more and the diffuse reflectance of 90% or more can be used as the reflectance.

  The micro-foamed resin sheet is preferably made of any one of PET resin, PC resin, flame retardant PC resin, and acrylic resin.

  The frame may be formed of the same type of micro-foamed resin sheet as the reflector.

  In addition, a resin coating is provided on the inner surface of the frame, and the resin coating includes a thermoplastic resin compound including a white pigment, an epoxy resin compound including a white pigment and a curing material, and a urethane resin compound including a white pigment and a curing material. Further, it may be a silicon resin compound or a fluorine resin compound containing a white pigment and a curing material.

  The shape of the micro-foamed resin sheet of the reflection plate may be any one of letters, figures, symbols, or a combination thereof.

  It is desirable that a position where the reflecting plate is attached to the diffusion plate of the micro foam resin sheet is provided so that the LED light source is hidden directly above the LED light source.

  It is desirable that the area of the attaching portion of the micro foam resin sheet of the reflection plate is 30% or less of the apparent area of the light extraction portion of the diffusion plate.

  The frame may have a substantially rectangular parallelepiped shape, a prismatic shape, or a truncated pyramid shape.

  The shape of the frame may include a wall portion that is substantially perpendicular to the opening and a curved portion that curves from the lower end of the wall portion and extends obliquely upward.

  The frame includes an outer frame and an inner frame disposed inside the outer frame, and the inner frame and the outer frame both include the opening and the recess. The inner frame body and the outer frame body are both made of a material having excellent light reflection characteristics, and the recess has a shape in which a horizontal section gradually expands toward the opening. Or having the same cross-sectional shape toward the opening, and the recesses of the inner frame and the outer frame are spaced apart from each other, and the recesses of the inner frame are An LED light source is disposed on at least a part of the inner surface, and an LED light source is disposed on either the outer surface of the recess portion of the inner frame body or the inner surface of the recess portion of the outer frame body, The opening is a first light extraction unit, and the first light extraction unit The opening between the outer frame and the inner frame is a second light extraction unit, and the first light extraction unit and the second light extraction unit are The LED illumination device may be covered with a diffusion plate, and at least a part of the first light extraction unit and the second light extraction unit on the back surface of the diffusion plate may be covered with a micro foam resin.

  A flange portion may be formed in the opening of the frame, and the flange portion may be bent and bonded to the diffusion plate.

A frame body including an inner frame body and an outer frame body, and a diffusion plate that covers an opening portion of the frame body, wherein the inner frame body and the outer frame body are downward from the opening portion and the opening portion. The inner frame and the outer frame are both made of a material having excellent light reflection characteristics, and the recesses of the inner frame and the outer frame are mutually connected. The LED light source is disposed on at least a part of the inner surface of the indented portion of the inner frame body, facing away from each other, and either the outer surface of the indented portion of the inner frame body or the inner surface of the indented portion of the outer frame body An LED light source is disposed, and the opening of the inner frame is a first light extraction unit, is formed around the first light extraction unit, and the outer frame and the inner frame The opening between the first light extraction unit and the front is the second light extraction unit A second light extraction portion is covered with the diffusion plate, a groove is formed in the diffusion plate, and at least a tip of the opening of the inner frame is inserted into the groove formed in the diffusion plate. The LED lighting device may be characterized in that the vicinity of the tip of the opening is sandwiched in the groove of the diffusion plate or is bonded and fixed to the groove.
It is desirable that the recess has a shape in which a horizontal cross section gradually expands toward the opening or has the same cross-sectional shape.

Furthermore, a groove is formed in the diffusion plate, and the tip of the opening of the outer frame is inserted into the groove formed in the diffusion plate, and the vicinity of the tip of the opening of the outer frame is It may be sandwiched between the grooves of the diffusion plate or may be bonded and fixed to the grooves.

Alternatively, a protrusion or a claw is formed on the diffusion plate, and the tip of the opening of the outer frame is in contact with the protrusion formed by bending the end of the diffusion plate. Or the end of the diffusion plate may be pressed by the claw formed with a bent shape.

  The frame may be formed of a microfoamed resin sheet. Thus, if the frame is formed of a micro-foamed resin sheet, the micro-foamed sheet can be press-fitted when the tip of the frame opening is inserted into the groove formed in the diffusion plate. After the press-fitting, the micro-foamed resin sheet exerts an elastic repulsive force on the groove of the diffusion plate, so that the end of the frame opening can be brought into close contact with the groove.

  Further, the reflectance of the micro foam resin sheet of the frame body is such that the total reflectance is 90% or more and the diffuse reflectance is 90% or more with respect to the case where the reflectance of the aluminum oxide standard plate is 100%. However, it is desirable to use a material that satisfies a total reflectance of 95% or more and a diffuse reflectance of 95% or more. It is desirable that the micro-foamed resin sheet of the frame is made of any one of PET resin, PC resin, flame retardant PC resin, and acrylic resin.

  The shape of the frame body is such that both the inner frame body and the outer frame body have a wall portion that is substantially perpendicular to the opening, and a curved surface portion that curves from the lower end of the wall portion and expands obliquely upward. It is desirable to be.

  The diffusion plate is made of acrylic resin, polypropylene resin, polycarbonate resin, polystyrene resin, fluororesin or cycloolefin polymer with high transparency, but is colored translucent milky white. May be. When shape processing is performed on the diffusion plate, it is desirable to use acrylic resin or polypropylene resin that is easy to shape and inexpensive.

  The diffusion plate may be a diffusion plate in which at least the groove is shaped. The diffusion plate is inserted into the groove of the diffusion plate and at least one of the front end of the opening of the inner frame and the front end of the opening of the outer frame is sandwiched between the diffusion plates or the diffusion plate It may be a connection structure of the diffuser plate and the vicinity of the front end of the frame body opening of the LED lighting device that is bonded and fixed to the groove of the plate. The molding of at least one of the groove, the protrusion, and the claw of the diffusion plate may be performed by injection molding.

  According to the present invention, since the micro foam resin sheet having excellent light reflectivity is attached to a part of the back surface of the diffuser, the micro foam resin sheet as the reflector cannot be visually recognized when the illumination is turned off. Sometimes, the shape of the micro-foamed resin sheet emerges and the design can be improved. At this time, since the reflectance of the micro-foamed resin sheet is high, the light reflected on the back surface of the micro-foamed resin sheet can be reflected again on the bottom surface of the frame body to minimize the reduction in illuminance. For this reason, uniform light can be extracted with high illuminance.

  The micro-foamed resin sheet has a reflectivity of at least 90% and a diffuse reflectivity of 90% or more compared to the case where the reflectivity of the aluminum oxide standard plate is 100%. Although it can be used, it is desirable to diffuse and reflect light more efficiently by using a material satisfying a total reflectance of 95% or more and a diffuse reflectance of 95% or more.

  Further, if the microfoamed resin sheet is any one of PET resin, PC resin, flame retardant PC resin, and acrylic resin, light can be diffused and reflected efficiently.

  Moreover, it is preferable that the frame is formed of a micro foamed resin sheet similar to the reflector. When the frame is not formed of the micro-foamed resin sheet, the reflectance of the frame can be improved by providing a resin coating having excellent light reflection characteristics on the inner peripheral surface of the frame.

  Here, the light reflectance of the micro-foamed resin sheet is superior to the case where a resin coating having excellent light reflection characteristics is provided. For this reason, the brightness | luminance in the light extraction surface of the light by which a frame and a reflecting plate carry out multiple reflection of light and it is extracted from the light extraction part of a diffusion plate is high. The above is the reason why it is preferable to form the frame body with a micro-foamed resin sheet.

  At this time, the resin coating includes a thermoplastic resin compound containing a white pigment, an epoxy resin compound containing a white pigment and a curing material, a urethane resin compound containing a white pigment and a curing material, and a silicon resin containing a white pigment and a curing material. If a compound or a fluororesin compound is used, light reflection characteristics are good.

  In addition, by making the shape of the micro foam resin sheet one of letters, figures, symbols, or a combination of these, the letters, figures, symbols, etc. can be used for lighting, message, owner name, company name, school name or By forming these logo marks and the like, not only can the design be improved, but also a message can be imparted or used for advertising.

  In addition, by providing a micro-foamed resin sheet so that the LED light source is hidden almost directly above the LED light source, at least a part of the direct light directed from the LED light source substantially directly above the LED light source can be shielded, and a glare feeling can be obtained. Can be reduced.

  Moreover, sufficient illuminance is securable by making the area of the sticking part of a micro foaming resin sheet into 30% or less of the apparent area (surface area of a light extraction part) of the light extraction part of a diffusion plate.

  Moreover, if the shape of the frame is substantially rectangular parallelepiped, prismatic or pyramidal, the design is excellent.

  In addition, the inner frame body and the outer frame body each include a wall portion substantially perpendicular to the opening, and a curved surface portion that curves from the lower end of the wall portion and expands obliquely upward. With the shape, the layout of the LED light source is easy, and light can be uniformly irradiated from the opening.

  In addition, since the frame body has a double structure of the inner frame body and the outer frame body, light can be extracted from the first light extraction unit and the second light extraction unit, respectively.

  Here, a first light guide space is formed between the surface side of the inner frame and the opening. Similarly, a second light guide space is formed between the back side of the inner frame and the surface side of the outer frame, and the second light guide space is formed so as to cover the first light guide space. Is done. For this reason, miniaturization of the double illumination which has the 1st light guide space and the 2nd light guide space is attained. Furthermore, by changing the color of light extracted from the first light extraction unit and the second light extraction unit, it can be used as decorative lighting. For nighttime use or in-car use, it is desirable to use blue light as the colored light for decorative lighting.

  Further, the diffusion plate and the frame can be reliably bonded by bending the flange portion of the opening of the frame and bonding it to the diffusion plate.

  In addition, by inserting the tip of the opening of the frame into the groove formed in the diffusion plate and sandwiching the vicinity of the tip of the opening with the groove or by adhering and fixing to the groove, the diffusion plate and the frame are securely Can be joined. Further, if the thickness of the opening end of the frame is set to be slightly larger than the opening size and press-fitted, the end of the frame can be stably held by the groove formed in the diffusion plate. In order to do this, it is desirable to form the frame body from a micro foamed resin that is easy to compress and easily obtains an elastic repulsion. A diffusion plate having such grooves can be obtained by injection molding.

  In addition, the frame body has a double structure of an inner frame body and an outer frame body, the tip of the opening of the inner frame is inserted into the groove formed in the diffusion plate, and the vicinity of the tip of the opening is sandwiched by the groove. In addition, by adhering and fixing to the groove, the diffuser plate and the frame can be reliably bonded, and diffusion is performed in the groove portion of the diffuser plate at the boundary between the first light extraction portion and the second light extraction portion. The plate becomes thinner.

  Further, at the portion where the tip of the opening of the frame is inserted into the groove, the light on the light guide space side is reflected toward the light extraction portion near the tip of the frame. For this reason, it can suppress that the light of the light extraction part of a diffuser plate reflects in the inside of a diffuser plate, and leaks from each light extraction part to the opposite light extraction part, and is mixed with each other. As a result, the front end of the frame, which is the boundary line between the first light extraction portion and the second light extraction portion, can be clearly and clearly seen. Thus, in addition to the effect of fixing the vicinity of the tip of the opening of the frame body to the groove formed in the diffusion plate, it has both the optical effect of preventing color mixing due to diffuse reflection inside the diffusion plate.

  ADVANTAGE OF THE INVENTION According to this invention, it is possible to irradiate light uniformly with high illumination intensity, and the LED lighting apparatus excellent in the designability can be provided by sticking a micro foaming resin sheet on the diffusion plate back surface. Moreover, according to this invention, the illuminating device which can change the designability of a diffusion plate at the time of lighting and light extinction can be provided.

The top view which shows LED lighting apparatus 1. FIG. (A) is sectional drawing of the LED lighting apparatus 1, AA sectional view taken on the line of FIG. 1, (b) is sectional drawing of the LED lighting apparatus 1a. (A) is sectional drawing of LED lighting apparatus 1b, (b) is sectional drawing of LED lighting apparatus 1c. (A) is sectional drawing of LED lighting apparatus 1d, (b) is sectional drawing of LED lighting apparatus 1e. The top view which shows 1f of LED lighting apparatuses. It is sectional drawing of LED lighting apparatus 1f, and is DD sectional view taken on the line of FIG. It is sectional drawing of the LED lighting apparatus 1f, and is the EE sectional view taken on the line of FIG. The top view which shows 1g of LED lighting apparatuses. It is sectional drawing of LED lighting apparatus 1g, and the FF sectional view taken on the line of FIG. It is a figure which shows the joining state of the diffusion plate 11 and each frame, and is the G section enlarged view of FIG. (A), (b) is a figure which shows the other joining state of the diffusion plate 11 and each frame. (A), (b) is a figure which shows the other joining state of the diffusion plate 11 and each frame.

(First embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing the LED lighting device 1. Moreover, Fig.2 (a) is the sectional view on the AA line of FIG.

  The LED lighting device 1 mainly includes a frame 3, a diffusion plate 11, a reflection plate 15, an LED light source 23a, and the like.

  The frame 3 includes an opening 27a and a recess 33a having a shape in which a horizontal section gradually expands toward the opening 27a. More specifically, the recessed portion 33a has a shape including a wall portion 29a substantially perpendicular to the opening portion 27a (the diffusion plate 11) and a curved surface portion 31a that curves from the lower end of the wall portion 29a and extends obliquely upward. The shape of the frame 3 is not limited to the illustrated example.

  The LED light source 23a is disposed in at least a part of the recess 33a. In the illustrated example, the LED light source 23a is disposed in the approximate center of the wall portion 29a. The LED light source 23 a is arranged with the light emitting surface facing the surface side of the curved surface portion 31 a of the frame 3.

  A switch 5 is disposed near the edge of the diffusion plate 11. The switch 5 is connected to the LED light source 23a by wiring. The switch 5 is connected to the circuit board 19. The circuit board 19 is a glass epoxy board, for example. The wiring on the circuit board 19 and the LED light source 23a are directly connected. The circuit board 19 and the LED light source 23a may be connected by a flexible flat board.

  The diffusion plate 11 is provided so as to cover the opening 27 a of the frame 3. The diffusion plate 11 is made of a material containing a light scatterer. As a material of the diffusion plate 11, for example, an acrylic resin or glass is used. Further, the diffusion plate 11 may be a polyester brightness enhancement film or the like attached to an acrylic resin or glass member.

  The opening 27a covered with the diffusing plate 11 constitutes the light extraction portion 9a. That is, the light emitted from the LED light source 23 a is diffused and reflected on the inner surface of the frame 3 and is emitted from the diffusion plate 11.

  Note that the diffusion plate 11 and the vicinity of the tip of the opening 27a can be joined by, for example, bonding. At this time, a flange portion (not shown) may be formed in the opening 27 a of the frame 3, and the flange portion may be bent and bonded to the diffusion plate 11.

  A reflector 15 is attached to a part of the back surface of the diffusion plate 11. The reflecting plate 15 is preferably any one of letters, figures, symbols, or a combination thereof. Further, it is desirable that the area of the attaching portion of the reflecting plate 15 is 30% or less of the apparent area of the light extraction portion 9a of the diffusion plate (surface area of the light extraction portion 9a). By doing in this way, the light extraction area can be secured.

  In addition, it is desirable that the reflection plate 15 is attached to the diffusion plate 11 so that the LED light source 23a is hidden directly above the LED light source 23a. Thus, the reflection plate 15 attached to the diffusion plate 11 can prevent light from the LED light source 23a from being emitted directly above the LED light source 23a. For this reason, the light emitted from almost directly above the LED light source 23a of the illuminating device is reduced, and the glare can be reduced. The light reflected by the reflecting plate 15 is diffused and reflected on the inner surface of the frame and can be extracted from the diffusing plate 11. At this time, since the reflecting plate 15 is formed of a micro foam resin having a high light reflectance and the inner surface of the frame body is formed of a material having a high light reflectance, the illuminance of the light emitted from the diffusion plate 11 hardly decreases. .

  As shown in FIG. 2A, when the LED light source 23a is provided on the wall 29a perpendicular to the opening 27a, assuming a light distribution half angle (B in the figure) of the LED light source 23a, It is desirable that the light distribution angle is applied to the reflecting plate 15. In this case, the light distribution half angle of the LED light source 23a is, for example, 60 °. Thus, by arranging the LED light source, it is possible to prevent the light at an irradiation angle at which the luminance of the LED light source is high from being directly emitted, so that the effect of reducing the glare can be enhanced.

  Here, the reflecting plate 15 is composed of, for example, a micro-foamed resin sheet (a porous member having a large number of fine mechanisms). The microfoamed resin sheet used in the present invention is an insulating resin sheet having a foamed layer at the center and non-foamed layers on both sides. Here, the foam layer refers to a layer in which bubbles are generated by foaming.

  In the present invention, the thickness of the microfoamed resin sheet is 0.4 mm to 2.0 mm, and preferably 1.0 mm to 2.0 mm. The thickness of the non-foamed layer is 10 to 30 μm. In addition, the microfoamed resin sheet of the present invention preferably has an average cell diameter in the range of 0.2 μm to 40 μm. If the average bubble diameter is too small than 0.2 μm, the light transmittance increases and the reflectance decreases. In addition, if the average bubble diameter is too large, the diffuse reflectance decreases, so the average bubble diameter needs to be 0.2 μm to 40 μm. Further, the average bubble diameter is preferably 0.5 μm to 20 μm.

  It is desirable that the reflectance of the micro-foamed resin sheet satisfies the total reflectance of 90% or more and the diffuse reflectance of 90% or more with respect to the case where the reflectance of the aluminum oxide standard plate is 100%. Both the total reflectance and the diffuse reflectance are preferably 95% or more, and can be 99% or more.

  In the present invention, the micro-foamed resin sheet is made of any one of PET resin (polyethylene terephthalate resin), PC resin (polycarbonate resin), flame retardant PC resin, acrylic resin, for example, PMMA resin (polymethyl methacrylate resin). It is preferable to configure. In addition to the above, a transparent resin obtained by imparting flame retardancy to an acrylic resin such as a cycloolefin polymer or polyacrylonitrile can also be used for the microfoamed resin sheet. Moreover, you may use the microfoaming resin sheet by which the process of giving antistatic, a flame retardance provision, an ultraviolet-resistant coating etc. according to a use place and a use is performed.

  The frame 3 can also be made of the same material as that of the reflector 15. That is, at least the inner surface of the frame 3 is formed of a material having excellent light reflection characteristics. Thus, by forming the frame body 3 with the micro foamed resin having excellent light reflection characteristics, the reflectance of the frame body peripheral surface which is the light reflection surface of the frame body 3 can be increased.

  Further, for example, the frame body 3 may be formed of a polypropylene resin that is often used for normal injection molding, and a resin coating excellent in light reflection characteristics may be provided on the inner peripheral surface of the frame body that is a light reflection surface of the frame body 3. In this case, the resin coating is a thermoplastic resin compound containing a white pigment, an epoxy resin compound containing a white pigment and a curing material, a urethane resin compound containing a white pigment and a curing material, and a silicon resin containing a white pigment and a curing material. A compound or a fluororesin compound can be selected.

  Next, the function of the LED lighting device 1 will be described. The diffuser plate 11 is translucent, and in a state in which the LED light source 23a is turned off, the reflector plate 15 has a high diffuse reflectance of light, and the light reflected by the reflector plate 15 is less absorbed. Since it hardly absorbs, the reflector 15 cannot be visually recognized from the outside. On the other hand, when the LED light source 23a is turned on, the light emitted from the LED light source 23a is emitted from a portion other than the portion where the reflecting plate 15 is attached. For this reason, a difference occurs in the luminance of the diffusion surface of the diffusion plate 11 between the position where the reflection plate 15 is attached and the light extraction portion 9a where the reflection plate 15 is not attached, and the contour shape of the reflection plate 15 is recognized. it can.

  Here, of the light emitted from the LED light source 23 a, the light reflected on the back surface of the reflecting plate 15 is re-reflected on the bottom surface of the frame 3 and is emitted from the diffusion plate 11. That is, the inside of the frame body 3 (the space surrounded by the frame body 3 and the diffusion plate 11) becomes the light guide space 25a. At this time, since the reflectivity of the reflecting plate 15 and the inner surface of the frame 3 is high, the reduction in illuminance due to multiple reflections can be minimized and high illuminance can be obtained. In addition, since light is diffusely reflected on the inner surfaces of the reflector 15 and the frame body 3, surface light can be emitted uniformly in the light extraction portion 9a.

  Note that the shape of the frame 3 and the arrangement of the LED light sources 23a are not limited to the example described above. FIG. 2B is a cross-sectional view showing the LED lighting device 1a. In the following cross-sectional views, illustration of the switch 5 and the circuit board 19 is omitted. Moreover, in the following description, about the structure of each part which show | plays the same function as the LED lighting apparatus 1, the code | symbol same as FIG. 1, FIG. 2 (a) is attached | subjected, and the overlapping description is abbreviate | omitted.

  In the LED lighting device 1a, the LED light source 23a is disposed on the curved surface portion 31a. Even in this case, the LED light source 23 a is arranged directly below the reflector 15. That is, the position where the reflecting plate 15 is attached to the diffusing plate 11 is provided almost directly above the LED light source 23a so that the LED light source 23a is hidden in plan view.

  Thus, the reflection plate 15 attached to the diffusion plate 11 can prevent light from the LED light source 23a from being emitted directly above the LED light source 23a. For this reason, the light emitted from almost directly above the LED light source 23a of the illuminating device is reduced, and the glare can be reduced. The light reflected by the reflecting plate 15 is diffusely reflected on the inner surface of the frame 3 and can be extracted from the diffusing plate 11. At this time, since the reflecting plate 15 is formed of a micro foam resin having a high light reflectance and the inner surface of the frame body is formed of a material having a high light reflectance, the illuminance of the light emitted from the diffusion plate 11 hardly decreases. .

  As described above, when the LED light source 23a is provided on the curved surface portion 31a facing the opening 27a, the light distribution angle is applied to the reflector 15 when assuming the light distribution half angle (C in the drawing) of the LED light source 23a. Such is desirable. In this case, the light distribution half angle of the LED light source 23a is, for example, 30 °. Thus, by arranging the LED light source, it is possible to prevent the light at an irradiation angle at which the luminance of the LED light source is high from being directly emitted, so that the effect of reducing the glare can be enhanced.

  Moreover, Fig.3 (a) is sectional drawing which shows the LED lighting apparatus 1b. In the LED lighting device 1b, the shape of the frame 3 is a substantially rectangular parallelepiped shape. That is, the frame 3 of the LED lighting device 1b includes an opening 27a and a recess 33a whose horizontal cross section has the same cross-sectional shape toward the opening 27a.

  Even in this case, the LED light source 23a may be disposed on the wall 29a or on the bottom side as illustrated.

  Moreover, FIG.3 (b) is sectional drawing which shows the LED lighting apparatus 1c. In the LED lighting device 1c, the shape of the frame 3 is a substantially prismatic shape. That is, the frame body 3 of the LED lighting device 1c is oblique so that one wall portion 29a is formed substantially perpendicular to the opening portion 27a and only the wall portion facing the wall portion 29a extends toward the opening portion 27a. Formed. Therefore, the horizontal cross section gradually expands toward the opening 27a.

  Even in this case, the LED light source 23a may be disposed on the bottom surface of the frame 3 as illustrated, or may be disposed on the wall 29a side.

  FIG. 4A is a cross-sectional view showing the LED lighting device 1d. In the LED lighting device 1d, the shape of the frame body 3 is a substantially truncated pyramid shape. In other words, the frame 3 of the LED lighting device 1d is formed obliquely so that the opposing wall portions 29a extend toward each other toward the opening 27a. Therefore, the horizontal cross section gradually expands toward the opening 27a.

  As shown in FIG. 4 (a), the LED light source 23a may be arranged on the wall 29a side of the frame 3, but as in the LED lighting device 1e shown in FIG. It may be arranged on the bottom side of the body 3.

  As described above, according to the present embodiment, the reflection plate 15 is disposed on the back surface of the diffusion plate 11. For this reason, when the LED light source 23a is turned off, the reflected light reflected on the front surface or the back surface of the diffusion plate 11 is observed. At this time, since there is almost no light absorption by the micro-foamed resin attached to the back surface of the diffusion plate, there is almost no difference in illuminance between the portion where the micro-foamed resin is attached to the diffusion plate 11 and the portion where it is not attached. For this reason, the shape of the reflector 15 cannot be visually recognized when the LED light source 23a is turned off. However, when the LED light source 23a is turned on, the shape of the reflecting plate 15 can be lifted on the diffusing plate 11 and visually recognized. Therefore, the LED lighting device excellent in design can be obtained.

  At this time, since the reflecting plate 15 is made of a micro-foamed resin sheet having excellent light reflecting characteristics, the light reflected on the back surface of the reflecting plate 15 is re-reflected on the inner surface of the frame 3 to efficiently extract the light. Can do. Moreover, since light is diffusely reflected on each surface of the frame, the illuminance is high and uniform light can be extracted.

  Moreover, since the reflecting plate 15 is provided immediately above the LED light source 23a, direct light from the LED light source 23a can be shielded, and glare can be reduced.

  Note that the LED lighting device of the present invention is particularly suitable for portable use, indoor lighting, or interior lighting.

(Second Embodiment)
Next, a second embodiment will be described. FIG. 5 is a plan view showing the LED lighting device 1f according to the second embodiment, FIGS. 6 and 7 are cross-sectional views of the LED lighting device 1f, and FIG. 6 is a cross-sectional view taken along the line DD of FIG. 7 is a cross-sectional view taken along the line EE of FIG.
It is sectional drawing.

  The LED lighting device 1f has substantially the same configuration as the LED lighting device 1, but differs in that the frame 3 has a double structure. The LED illumination device 1f mainly includes a frame 3, a diffusion plate 11, a reflection plate 15, LED light sources 23a and 23b, a switch 5, and the like.

  The frame 3 for the LED lighting device 1f includes an inner frame 3a and an outer frame 3b. The inner frame body 3a is disposed inside the outer frame body 3b. That is, the frame 3 has a double structure.

  Both the inner frame body 3a and the outer frame body 3b include openings 27a and 27b provided on the respective upper portions, and recesses 33a and 33b formed downward from the openings 27a and 27b. That is, both the inner frame body 3a and the outer frame body 3b are composed of openings 27a and 27b and depressions 33a and 33b having a shape in which the horizontal section gradually expands toward the openings 27a and 27b. The recesses 33a and 33b may have the same cross-sectional shape in the horizontal direction toward the openings 27a and 27b. More specifically, the recessed portions 33a and 33b of the inner frame body 3a and the outer frame body 3b are formed from wall portions 29a and 29b substantially perpendicular to the respective opening portions 27a and 27b, and from the lower ends of the wall portions 29a and 29b. Curved portions 31a and 31b that are curved and extend obliquely upward toward the openings 27a and 27b are provided. In addition, the shape of the inner side frame 3a and the outer side frame 3b is not restricted to the illustrated example.

  Recessed portions 33a and 33b of the inner frame body 3a and the outer frame body 3b are arranged so as to face each other while being separated from each other. Here, in the following description, the openings 27a and 27b side of the inner frame body 3a and the outer frame body 3b are referred to as “front side” of each frame body, and the opposite side is referred to as “back side”. . That is, the front side of the inner frame 3a faces the opening 27a, and the back side of the inner frame 3a faces the front side of the outer frame 3b.

  The surface side of the inner frame 3a functions as a reflector. Therefore, the light guide space 25a that is the first light guide space is formed between the surface side of the inner frame 3a and the opening 27a. Similarly, the back surface side of the inner frame body 3a and the front surface side of the outer frame body 3b each function as a reflector. Therefore, a light guide space 25b that is a second light guide space is formed between the back side of the inner frame 3a and the front side of the outer frame 3b. That is, both sides of the inner frame 3a function as a reflector.

  A protrusion 17 is provided on the back side of the inner frame 3a. The protrusion 17 protrudes to the surface side of the outer frame 3b facing the back side of the inner frame 3a, and the tip of the protrusion 17 contacts the outer frame 3b. By doing in this way, it can prevent that the inner side frame 3a is supported by the outer side frame 3b, and the light guide space 25b will be crushed.

  In addition, what is necessary is just to form the protrusion 17 in either the back surface side of the inner side frame 3a, or the surface side of the outer side frame 3b in the light guide space 25b. In this case, the protrusions 17 protruding in the opposing direction may be in contact with the back surface of the opposing inner frame 3a or the surface of the outer frame 3b. The protrusion 17 may be formed separately from the inner frame body 3a or the outer frame body 3b, and may be joined to the back surface side of the inner frame body 3a or the front surface side of the outer frame body 3b. Alternatively, a part of the outer frame 3b may be deformed to form the protrusion 17 integrally with the inner frame 3a or the outer frame 3b. As described above, the inner frame 3a and the outer frame 3b can be formed of a micro-foamed resin sheet having excellent light reflection characteristics.

  The opening 27a of the inner frame 3a serves as the first light extraction portion 9a from the light guide space 25a. Moreover, the opening part 27b between the outer side frame 3b and the inner side frame 3a becomes the 2nd light extraction part 9b from the light guide space 25b. The light extraction portion 9b is formed around the light extraction portion 9a.

  An LED light source 23a that is a first LED light source is disposed on at least a part of the inner surface of the recess 33a of the inner frame 3a. In addition, an LED light source 23b, which is a second LED light source, is disposed on the outer surface of the recess 33a of the inner frame 3a with the light emitting surface facing the surface side of the outer frame 3b.

  In addition, you may arrange | position the LED light source 23b in the inner surface side of the hollow part 33b of the outer side frame 3b. That is, the LED light source 23b is provided at either the front surface of the outer frame body 3b or the back surface of the inner frame body 3a at the approximate center in the width direction of either the curved surface portion 31a or 31b of the inner frame body 3a or the outer frame body 3b. The light emitting surface is arranged.

  The LED light source 23a disposed inside the light guide space 25a irradiates light with the light emitting surface directed toward the light guide space 25a. Therefore, the light from the LED light source 23a is diffused and reflected on the surface side of the inner frame 3a and is emitted from the light extraction portion 9a. Moreover, the LED light source 23b arrange | positioned inside the light guide space 25b irradiates light toward the light guide space 25b. Therefore, the light from the LED light source 23b is diffused and reflected on the back surface side of the inner frame body 3a and the front surface side of the outer frame body 3b, and is emitted from the light extraction portion 9b.

  In addition, you may make it make the color of the light of LED light source 23a and LED light source 23b differ. For example, the light from the LED light source 23a may be white or light yellow illumination light, and the light from the LED light source 23b may be colored illumination light having a color different from that of the LED light source 23a. By doing in this way, LED light source 23a can be used as practical light, and LED light source 23b can be utilized as decoration light. In addition, when the double-structured illumination is used in a dark environment such as at night or in a car, the photoreceptor cell is a switch that recognizes red by a can-like body having high sensitivity to blue light due to Purkinje phenomenon. Since it works more preferentially than the shape, it is desirable to use blue light that can be felt brighter by the photoreceptor cells as the colored illumination light.

  The openings 27 a and 27 b of the inner frame body 3 a and the outer frame body 3 b are covered with the diffusion plate 11. That is, the light extraction portions 9 a and 9 b are covered with the diffusion plate 11. Near the tips of the openings 27a and 27b of the inner frame body 3a and the outer frame body 3b are joined to the diffusion plate 11. Therefore, the light guide spaces 25a and 25b are surely partitioned so that light in each space does not leak.

  Note that flange portions 35a and 35b (see FIG. 7) may be formed and adhered to the bonding surfaces of the inner frame body 3a and the outer frame body 3b and the diffusion plate 11. The flange portions 35a and 35b do not need to be formed on the entire periphery of the opening ends of the inner frame body 3a and the outer frame body 3b, and are formed outwardly on at least a part of the opening portions 27a and 27b. Also good.

  In the diffusing plate 11, the light extraction unit 9a and the light extraction unit 9b are partitioned by a partition unit 13 as necessary. For example, the partition portion 13 is formed at the boundary between the light extraction portion 9a and the light extraction portion 9b by sealing or painting with a predetermined width. By reliably partitioning the light extraction portion 9a and the light extraction portion 9b, the respective regions of the light extraction portions 9a and 9b can be clarified. Further, for example, even when the position of the joint portion between the front end of the inner frame 3a and the diffusion plate 11 is slightly shifted, the respective regions of the light extraction portions 9a and 9b vary due to the partition portion 13 having a predetermined width. Can be prevented.

  A reflector 15 is provided immediately above the LED light source 23a. That is, the reflecting plate 15 is provided so as to block a part of the light extraction portion 9a. In addition, you may arrange | position the reflecting plate 15 so that a part of light extraction part 9b may be plugged up.

  The switch 5 (FIG. 5) is connected to the LED light sources 23a and 23b by wiring (not shown). By switching the switch 5, the lighting of the LED light sources 23a and 23b can be switched.

  In a state where the LED light source 23a is turned off, the reflecting plate 15 has a high diffuse reflectance, and the light transmitted through the diffusing plate 11 is hardly absorbed by the reflecting plate 15, so that the reflecting plate 15 cannot be visually recognized from the outside. When the LED light source 23a is turned on, the light from the LED light source 23a repeats diffuse reflection on the surface side of the inner frame 3a, and the light is emitted from the light extraction portion 9a. That is, the light from the LED light source 23a is diffusely reflected in the light guide space 25a, and the light is emitted from the light extraction unit 9a. At this time, as described above, the reflection plate 15 can suppress direct light from the LED light source 23a from being emitted from the light extraction portion 9a. For this reason, a difference occurs in the luminance of the surface of the diffusion plate 11 of the light extraction portion 9a between the position where the reflecting plate 15 is pasted and the position where the reflecting plate 15 is not pasted, and the contour shape of the reflecting plate 15 is recognized. Therefore, there is little glare and uniform light can be extracted from the light extraction portion 9a.

  On the other hand, when the switch 5 is switched and the LED light source 23b is turned on, the light from the LED light source 23b repeats diffuse reflection on the back surface side of the inner frame body 3a and the front surface side of the outer frame body 3b to extract light. Light is emitted from the portion 9b. That is, the light from the LED light source 23b is diffusely reflected in the light guide space 25b, and the light is emitted from the light extraction unit 9b. At this time, since the light guide space 25b is located on the back side of the inner frame 3a, direct light from the LED light source 23b is not emitted from the light extraction portion 9b. For this reason, there is little glare feeling and uniform light can be extracted from the light extraction part 9b.

  For example, in a lighting device in which the light extraction portion 9b is formed so as to surround the light extraction portion 9a, the light guide spaces are simply divided and arranged as in the conventional case, and the LED light sources are respectively disposed in the light guide spaces. Even if it arrange | positions, since the site | part close | similar to a LED light source is bright and it becomes dark as it becomes far, uniform light cannot be taken out. However, if the regions for repeating the diffuse reflection are formed in the respective light guide spaces, the size of the lighting device increases.

  On the other hand, in this embodiment, the light guide spaces 25a and 25b have a laminated structure, the LED light source 23b is disposed in the light guide space 25b on the back side of the light guide space 25a, and the distance to the light extraction unit 9b ( The diffuse reflection section) can be lengthened, and uniform light can be extracted from the light extraction portion 9b by repeating diffuse reflection in the light guide space 25b. As a result, for example, even one LED light source can extract uniform light. At this time, since the light guide spaces 25a and 25b overlap with each other, the size can be reduced as compared with the case where the light guide spaces 25a and 25b are provided side by side.

  According to the second embodiment, an effect similar to that of the first embodiment can be obtained. Moreover, since the inner frame body 3a and the outer frame body 3b each function as a reflector, it is not necessary to install a reflector separately from the frame 3. For this reason, the number of parts can be suppressed. Further, the light guide space 25b having a bent shape can be formed from the light source to the light extraction portion. For this reason, surface light emission can be uniformly performed in each light extraction part. When the LED light source is turned on, it is possible to provide an illuminating device in which the shape of the reflecting plate 15 such as characters, figures, and symbols can be visually recognized, and when the LED light is turned off, the reflecting plate 15 cannot be visually recognized.

  Moreover, since the inner frame body 3a and the outer frame body 3b are separated and overlapped with each other, light guide spaces 25a and 25b that are independent from each other can be formed on the front surface side and the back surface side of the inner frame body 3a. That is, the inner side frame 3a can function both the front surface and the back surface as a reflector. Furthermore, the inner frame 3a itself can function as a partition plate for partitioning the light guide spaces 25a and 25b.

  Moreover, in the light guide space 25a, the light from the light extraction part 9a can be made uniform by diffusely reflecting light on the surface side of the inner frame 3a. Moreover, in the light guide space 25b, the light from the light extraction part 9b can be made uniform by diffusely reflecting light on the back surface side of the inner frame body 3a and the front surface side of the outer frame body 3b. At this time, the LED lighting device 1f can be miniaturized by providing the light guide spaces 25a and 25b with a multi-layer structure.

  In addition, since the protrusions 17 are formed on the opposite surfaces of the back surface side of the inner frame body 3a and the front surface side of the outer frame body 3b, the gap between the inner frame body 3a and the outer frame body 3b is reliably maintained. can do.

  Moreover, since the partition part 13 which divides | segments the light extraction parts 9a and 9b is provided in the surface of the diffusion plate 11, the light of light guide space 25a, 25b does not leak into the light extraction parts 9a and 9b mutually, and design Excellent in properties.

(Third embodiment)
Next, a third embodiment will be described. FIG. 8 is a plan view showing an LED lighting device 1g according to the third embodiment, and FIG. 9 is a cross-sectional view taken along line FF in FIG. The LED illuminating device 1g has substantially the same configuration as the LED illuminating device 1f of the second embodiment shown in FIG. 5, but the reflecting plate 15 is not formed on the back surface of the diffusing plate. 11 and the joining form are different. The optical characteristics such as reflectance of the micro-foamed resin sheet used for the frame body, the type of resin, the shape of the frame body including the vertical wall portion and the curved surface portion, and the like are the same as those in the first and second embodiments.

  FIG. 10 is an enlarged view of a portion G in FIG. In the present embodiment, the groove 21 is formed on the back surface side of the diffusion plate 11. The ends of the openings 27 a and 27 b of the frame 3 are inserted into the grooves 21 formed in the diffusion plate 11, and the vicinity of the ends of the openings 27 a and 27 b is sandwiched between the grooves 21. Furthermore, the vicinity of the tips of the openings 27a and 27b may be bonded and fixed to the groove 21.

  Here, the depth and width of the groove can be appropriately determined in consideration of the thickness of the diffusion plate 11 and the thickness of the micro-foamed resin sheet of the frame 3 inserted in the groove. For example, when the thickness of the diffusion plate 11 is 2 mm to 3 mm, the width of the groove 21 can be 1 mm and the depth of the groove 21 can be 1.5 mm. At least one of the distal end of the opening 27a of the inner frame 3a and the distal end of the opening 27b of the outer frame 3b is inserted into the groove 21 of the diffusion plate 11 and sandwiched between the diffusion plates 11 or is bonded and fixed to the groove 21. The By doing in this way, the connection structure of the frame opening part vicinity vicinity of a LED illuminating device and a diffusion plate can be obtained.

  In this way, the front end of the frame 3 is fitted into the groove 21 formed in the diffusion plate 11, so that the frame is firmly fixed to the diffusion plate rather than the end of the frame is adhered to the surface of the diffusion plate. Can do. Here, the frame body 3 is formed of a resin of micro foamed resin, and this can be press-fitted into the groove of the diffusion plate 11. Since the frame 3 exerts an elastic recovery force on the groove 21 by being press-fitted into the groove 21 of the diffusion plate 11 in this manner, the frame 3 is more firmly fixed to the groove 21 of the diffusion plate 11. be able to.

  By inserting the front end of the frame body 3 into the groove 21 of the diffusion plate 11, it is possible to prevent light that is transmitted while diffusing into the diffusion plate 11 from leaking out of each frame body. The frame 3 in which such grooves 21 are formed can be formed by, for example, injection molding. The diffusion plate 11 may be a diffusion plate 11 for an LED lighting device in which at least the groove 21 is processed.

  For example, when the light in the light guide space 25a passes through the diffusion plate 11 and is emitted to the outside, the light in the light guide space 25a diffuses inside the diffusion plate 11, so that a part of the light is extracted from the light extraction unit. Leak to the 9b side. At this time, when the tip of the opening 27a of the inner frame 3a is inserted into the groove 21, the light on the light guide space 25a side is transmitted to the inner surface of the inner frame 3a at least at the portion where the inner frame 3a is inserted. Is reflected to the light extraction portion 9a. For this reason, it can suppress that the light of light guide space 25a, 25b mixes. Therefore, the light boundaries of the light extraction portions 9a and 9b can be made more prominent.

  For example, when decorative lighting is used, LEDs arranged in the light guide spaces 25a and 25b inside the inner frame 3a and between the outer frame 3b and the inner frame 3a inside the outer frame 3b. Since the light from the light sources 23a and 23b hardly overlaps, the difference in color between the two LED light sources 23a and 23b can be emphasized. Here, the light that has entered the groove 21 in the direction perpendicular to the light extraction surface of the diffusing plate 11 between the inner frame 3a and the groove 21 penetrates the diffusing plate 11 as it is except for reflected light. Other light can be reflected on the groove forming end face of the diffusion plate 11 and the front end face of the frame body, so that the light from the light extraction portion 9a of the inner frame body 3a can be prevented from leaking to the outside.

  Such an effect can be obtained particularly by inserting the inner frame 3 a into the groove 21. Therefore, as shown in FIG. 11A, the opening end of the inner frame 3a is inserted into the groove 21 formed in the diffusion plate 11, and the opening end of the outer frame 3b is the end of the diffusion plate 11. You may make it contact | abut to the protrusion 37 formed in this.

  11B, the opening end of the inner frame 3a is inserted into the groove 21 formed in the diffusion plate 11, and the opening end of the outer frame 3b is at the end of the diffusion plate 11. You may make it hold | suppress by the formed nail | claw 39. FIG.

  Further, in addition to the groove 21 as shown in FIG. 10, FIG. 11 (a) and FIG. 11 (b), the diffusion plate 11 in which the protrusion 37 and the claw 39 are formed at the end of the diffusion plate 11, It can be formed by injection molding. Here, the diffusion plate 11 can be made of a transparent thermoplastic resin having high transparency such as acrylic resin, polypropylene resin, polycarbonate resin, polystyrene resin, fluororesin or cycloolefin polymer, but adjusted to a translucent milky white. It is desirable to use what was done. When shape processing is performed on the diffusion plate 11, it is desirable to use an acrylic resin or a polypropylene resin, which is a general-purpose resin that is easy to mold and inexpensive.

  Also, as shown in FIG. 12A, the opening end of the inner frame 3 a is inserted into the groove 21 formed in the diffusion plate 11, and the opening end of the outer frame 3 b is at the end of the diffusion plate 11. You may make it insert in the other groove | channel 21 while contacting the formed protrusion 37. FIG.

  Further, as shown in FIG. 12B, the opening end of the inner frame 3 a is inserted into the groove 21 formed in the diffusion plate 11, and the opening end of the outer frame 3 b is at the end of the diffusion plate 11. While being pressed by the formed claw 39, it may be inserted into another groove 21.

  As described above, the tip of the opening 27 a of the inner frame 3 a is inserted into the groove formed in the diffusion plate 11, and the vicinity of the tip of the opening 27 a is sandwiched by the groove 21 or bonded to the groove 21. The tip of the opening 27b of the outer frame 3b is fixed and is brought into contact with a protrusion 37 formed at the end of the diffusing plate 11 or pressed by a claw 39 provided at the end of the diffusing plate 11. Or may be inserted into another groove 21 formed in the diffusion plate 11 or a combination thereof.

  According to this embodiment, the diffusion plate 11 and the frame body 3 can be more reliably joined by inserting the tip of the opening of the frame body 3 into the groove 21 of the diffusion plate 11. In particular, by inserting the tip of the opening 27a of the inner frame 3a into the groove 21, it is possible to suppress the light from the light extraction portions 9a and 9b from being mixed and to make the boundary stand out. The diffuser plate 11 may be a diffuser plate 11 for an LED lighting device in which at least the groove 21 is shaped.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

  For example, it goes without saying that the embodiments described above can be combined with each other. For example, the groove 21 described above may be used at a joint portion between the diffusion plate 11 and the frame 3 in the other LED lighting device shown in FIGS.

1, 1a, 1b, 1c, 1d, 1e, 1f ......... LED lighting device 3 ......... Frame body 3a ......... Inner frame body 3b ......... Outer frame body 5 ......... Switches 9a, 9b ......... Light extraction part 11 ......... Diffuser 13 ... ... Partition 15 ... ... Reflector 17 ... ... Projection 19 ... ... Circuit board 21 ... ... Grooves 23a, 23b ... ... LED light sources 25a, 25b ... ...... Light guide spaces 27a, 27b ......... Openings 29a, 29b ......... Walls 31a, 31b ......... Curved surfaces 33a, 33b ......... Depressions 35a, 35b ......... Flanges 37 ......... Projections Part 39 ……… Nail

Claims (21)

A frame having an opening, and a recess having a shape in which a horizontal cross section gradually expands toward the opening or the same cross-sectional shape;
A diffusion plate covering the opening;
Comprising
The frame body is formed of a material having excellent light reflection characteristics, or an inner surface of the frame body is provided with a resin coating having excellent light reflection characteristics, and an LED light source is disposed in at least a part of the recess,
An LED lighting device, wherein a micro-foamed resin sheet is attached to a part of the back surface of the diffusion plate as a reflection plate.   The reflectance of the micro-foamed resin sheet of the reflecting plate satisfies the total reflectance of 95% or more and the diffuse reflectance of 95% or more, when the reflectance of the aluminum oxide standard plate is 100%. The LED lighting device according to claim 1.   The LED lighting device according to claim 1, wherein the micro-foamed resin sheet is made of any one of a PET resin, a PC resin, a flame retardant PC resin, and an acrylic resin.   4. The LED lighting device according to claim 1, wherein the frame body is formed of a micro-foamed resin sheet of the same type as the reflecting plate.   A resin coating is provided on the inner surface of the frame, and the resin coating includes a thermoplastic resin compound containing a white pigment, an epoxy resin compound containing a white pigment and a curing material, a urethane resin compound containing a white pigment and a curing material, The LED lighting device according to any one of claims 1 to 3, wherein the LED lighting device is a silicon resin compound or a fluororesin compound containing a white pigment and a curing material.   The LED illumination according to any one of claims 1 to 5, wherein the shape of the micro foamed resin sheet of the reflecting plate is any one of a character, a figure, a symbol, or a combination thereof. apparatus.   7. The attachment position of the reflective plate to the diffusion plate of the micro foam resin sheet is provided so that the LED light source is hidden substantially immediately above the LED light source. LED illuminating device of description.   The area of the attaching part of the micro foam resin sheet of the reflecting plate is 30% or less of the apparent area of the light extraction part of the diffusing plate. LED lighting device.   The LED lighting device according to any one of claims 1 to 8, wherein the shape of the frame is substantially rectangular parallelepiped, prismatic or pyramidal.   The shape of the frame body is a shape comprising a wall portion substantially perpendicular to the opening and a curved portion that curves from the lower end of the wall portion and extends obliquely upward. The LED lighting device according to any one of 8. The frame includes an outer frame and an inner frame disposed inside the outer frame, and the inner frame and the outer frame both include the opening and the recess. , And
The inner frame body and the outer frame body are both made of a material having excellent light reflection characteristics, and the hollow portion has a shape in which a horizontal section gradually expands toward the opening portion, or It has the same cross-sectional shape toward the opening,
The recesses of the inner frame and the outer frame are spaced apart from each other and face each other.
An LED light source is disposed on at least a part of the inner surface of the recess of the inner frame, and an LED light source is provided on either the outer surface of the recess of the inner frame or the inner surface of the recess of the outer frame. Arranged,
The opening of the inner frame is a first light extraction unit, is formed around the first light extraction unit, and the opening between the outer frame and the inner frame is A second light extraction unit;
The first light extraction portion and the second light extraction portion are covered with the diffusion plate,
The at least one part of the said 1st light extraction part and the said 2nd light extraction part of the back surface of the said diffusing plate is covered with micro foaming resin. LED illuminating device of description.   12. The LED according to claim 1, wherein a flange portion is formed in the opening of the frame body, and the flange portion is bent and bonded to the diffusion plate. Lighting device. A frame composed of an inner frame and an outer frame;
A diffusion plate covering the opening of the frame;
Comprising
The inner frame body and the outer frame body have the opening and a recess formed downward from the opening,
The inner frame and the outer frame are both made of a material having excellent light reflection characteristics,
The recesses of the inner frame and the outer frame are spaced apart from each other and face each other.
An LED light source is disposed on at least a part of the inner surface of the recess of the inner frame,
An LED light source is disposed on either the outer surface of the recess of the inner frame or the inner surface of the recess of the outer frame,
The opening of the inner frame is a first light extraction unit, is formed around the first light extraction unit, and the opening between the outer frame and the inner frame is A second light extraction unit;
The first light extraction portion and the second light extraction portion are covered with the diffusion plate,
A groove is formed in the diffusion plate, and at least a tip of the opening of the inner frame body is inserted into the groove formed in the diffusion plate, and a vicinity of the tip of the opening is in the groove of the diffusion plate. An LED lighting device, wherein the LED lighting device is sandwiched or fixed to the groove. 14. The LED lighting device according to claim 13, wherein the recess has a shape in which a horizontal section gradually expands toward the opening or has the same cross-sectional shape.   A groove is formed in the diffusion plate, and the tip of the opening of the outer frame is inserted into the groove formed in the diffusion plate, and the vicinity of the tip of the opening of the outer frame is the diffusion The LED lighting device according to claim 13 or 14, wherein the LED lighting device is sandwiched in a groove of a plate or bonded and fixed to the groove.   A protrusion or a claw is formed on the diffusion plate, and the tip of the opening of the outer frame is in contact with the protrusion formed by bending the end of the diffusion plate, Alternatively, the LED lighting device according to claim 13 or 14, wherein the LED lighting device is any one of being pressed by the claw formed by bending an end portion of the diffusion plate.   The frame is formed of a micro-foamed resin sheet, and the reflectance of the micro-foamed resin sheet is 95% or more of the total reflectance compared to the case where the reflectance of the aluminum oxide standard plate is 100%. The LED illumination device according to any one of claims 13 to 16, wherein a reflectance of 95% or more is satisfied.   The LED lighting device according to claim 17, wherein the micro foamed resin sheet of the frame body is made of any one of PET resin, PC resin, flame retardant PC resin, and acrylic resin.   The shape of the frame body is such that both the inner frame body and the outer frame body have a wall portion that is substantially perpendicular to the opening, and a curved surface portion that curves from the lower end of the wall portion and expands obliquely upward. The LED lighting device according to claim 13, wherein the LED lighting device is provided.   20. The diffusion plate according to claim 13, wherein the diffusion plate is made of a transparent thermoplastic resin of any one of an acrylic resin, a polypropylene resin, a polycarbonate resin, a polystyrene resin, a fluororesin, and a cycloolefin polymer. The LED lighting device according to claim 1.   21. The LED lighting device according to claim 20, wherein the diffusion plate is formed by being colored translucent milky white.

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