JP6200458B2 - LED lighting device - Google Patents

Description

The present invention relates to a lightweight LED lighting device having a small number of parts.

  Because of energy saving and long life, LED (Light Emitting Diode) illumination has become widespread, and many illuminations using LEDs have been proposed. Some of these lighting devices improve the light reflection characteristics by applying a light-reflective organic coating such as a white resist on the inside of the frame of the lighting device or a substrate on which the LED is mounted. Furthermore, there is one that uses a light reflecting plate for the purpose of improving the illuminance of the lighting device or light diffusion.

  For example, there is an LED light source light box in which an LED light source is arranged inside a box and a light reflection plate is arranged in the box (Patent Document 1).

  Also, a surface illumination light source device that can obtain uniform illumination light over a wide area without increasing the thickness of the LED in the radiation direction using a highly directional LED light source and a surface illumination device using the surface illumination light source device have been proposed. Yes. (Patent Document 2)

  Furthermore, there is an illuminating device in which LED light sources are disposed opposite to both ends of a space formed by a planar lens that is a pair of light outlets of an illumination lamp and a case. (Patent Document 3)

  Patent Document 1 aims to suppress surface illuminance unevenness even when a highly directional LED light source is used.

  However, if many LED light sources are used like patent document 1, cost will increase. Further, Patent Document 1 arranges a light reflection plate or the like in the box body, has a large number of parts, and in order to increase the reflectance at the center portion away from the LED light source of the box body, It is necessary to arrange a separate reflector. For this reason, a structure becomes complicated and causes an increase in weight.

  Patent Document 2 is an illumination light source device that includes a light guide having a radiation surface in a radiation direction of a light emitting source and a casing that closes a surface other than the radiation surface of the light guide. However, in addition to the radiation side reflection means provided on the radiation surface, the casing is provided with an inner reflection means, and the molded casing does not also serve as a reflection plate. Since the light guide is provided in the radiation direction of the light emitting source, the thickness of the casing is increased. Moreover, since the light from the light source is reflected by the reflecting surface of the light guide, there is a problem that the number of reflections increases and the illuminance decreases. In order to realize uniform surface light emission, there is a problem that the pattern of the reflecting surface of the light guide becomes complicated and the processing cost is increased.

  Patent Document 3 has a structure in which a light diffusing film having a light diffusing function and a reflecting function is attached to the rear surface of a lens arranged in parallel, or the other is attached to a light reflecting plate. In the illuminating device of Patent Document 3, the irradiation light of the LED is diffused in a direction orthogonal to the light irradiation direction while being reflected between the light diffusion films or between the light diffusion film and the light reflection plate, and surface-emits from the lens. However, the housing is composed of the device case main body and the lens, and the light diffusion film and the light reflecting plate are attached to the lens that is a part of the housing, and the light diffusion film and the light reflecting plate are used as the housing of the lighting device. Therefore, it is necessary to affix them and it is difficult to apply them to complicated structures.

The LED substrate placed on the side has a white resist reflection treatment on the surface of the LED substrate, but the reflectivity is not high, and the light emitted from the LED is reflected by the light diffusion film or light reflector. The emitted illumination light is absorbed by the LED substrate and the LED substrate is heated. As a result, there is a concern about reduction in luminous efficiency and lifetime.
Moreover, since an expensive light-diffusion film is used, there exists a subject that cost becomes high.

JP 2006-202729 A JP 2008-027886 A JP 2010-177196 A

The present invention has been made in view of such problems, and pays attention to the light reflection characteristics of a micro-foamed resin sheet (a porous member having a large number of fine mechanisms). Further, an object of the present invention is to provide an LED lighting device having a complicated shape, which can realize surface light emission with low power consumption because the frame body also serves as a reflector .

In order to achieve the above-described object, the present invention provides a lighting device having a frame body including a top surface portion, a bottom surface portion having an opening, and a side surface portion connecting the top surface portion and the bottom surface portion. In the top surface portion, the side surface portion, and the bottom surface portion, at least two surfaces are formed from a micro-foamed resin sheet, and the frame itself also serves as a light reflecting plate foamed resin molded body. In addition, an opening for arranging the LED light source is provided on the side surface or the top surface, and the light emitting surface of the LED light source is positioned on the inner surface side of the opening of the light reflecting plate foamed resin molded body. flat flexible flat cable, wherein the LED light source is mounted is disposed so as to be exposed to and along the outer side of the light reflecting plate foamed resin molded body is adhered to the outer surface of the light reflecting plate foamed resin molded article Oh The substrate on which the flat flexible flat cable on which the LED light source is mounted is arranged on the inner surface side of the foamed resin molded body of the light reflecting plate is used as a light reflecting plate, and on the outer surface side of the foamed resin molded body of the light reflecting plate an LED lighting device according to claim Rukoto used as the supporting surface.

Here, it is preferable that the frame for the lighting device is provided with an opening for extracting light on the bottom surface. At least two surfaces of the top surface portion, the side surface portion, and the bottom surface portion are integrally formed. In particular, it is desirable that at least one of the top surface portion and the side surface portion or the bottom surface portion and the side surface portion is integrally formed. Here, the two surfaces being integrally formed means that they are integrally formed or formed as a continuous body. In addition, since the flat flexible flat cable is bonded as in the present invention, the LED light source can be easily attached to the frame in accordance with the shape or the like. Further, the flexible flat cable can be freely folded or folded on the frame. For this reason, an illuminating device can be manufactured only by affixing the flexible flat cable which mounted the LED light source on the curved surface of the frame which cannot be implement | achieved when LED light source is arrange | positioned on rigid boards, such as glass epoxy. In addition, the flexible flat cable can be attached to the frame without substantially applying stress or distortion.

The inner surface of the light reflecting plate foamed resin molded body is a light reflecting plate, and a concave portion that matches the width of the flat flexible flat cable is formed on the outer peripheral surface of the side surface that is the outer surface of the light reflecting plate foamed resin molded body. being, the LED light source is the flat flexible flat cable may be or is fitted write or are arranged along a mounted in the recess.

When the light reflecting plate foamed resin molded body has a cylindrical shape, a substantially truncated cone shape, or a substantially truncated pyramid shape, and the light reflecting plate foamed resin molded body has a substantially truncated cone shape, the top surface portion and the side surface portion In addition, when the flange portion is formed substantially parallel to the top surface portion, and the frame body has a substantially truncated pyramid shape, the side surface portion of the light reflecting plate foamed resin molded body extends from the bottom surface portion. It is desirable to form so as to expand toward the flange portion of the top surface .

It is desirable that the flat flexible flat cable has a preliminary wiring for heat dissipation.

It is desirable that a light diffusing plate is disposed in the opening of the bottom surface portion formed from the microfoamed resin .

The light reflecting plate foamed resin molded product has a light reflectance of 90% or more with respect to the barium sulfate standard piece when the barium sulfate standard piece is used as an optical characteristic for visible light having a wavelength of 450 to 650 nm. It is desirable that the diffuse reflectance is 90% or more. Moreover, it is desirable that the light reflecting plate foamed resin molding is made of any one of PET resin, PC resin, flame retardant PC resin, and acrylic resin.

The micro foamed resin sheet wherein the LED illumination apparatus for a frame body formed by molding, the optical characteristic wavelength is visible light of 450~650nm is, when using barium sulfate standard pieces, light on barium sulfate standard piece The reflectance is preferably made of any one of PET resin, PC resin, flame retardant PC resin, and acrylic resin having a total reflectance of 90% or more and a diffuse reflectance of 90% or more.

When the thickness of the light reflecting plate foamed resin molded article is 1 mm or more, it is desirable that the wavelength dependency of the reflectance with respect to visible light having a wavelength of 450 to 650 nm is within 2%.

According to the present invention, since the frame body is formed of the micro foam resin sheet having excellent light reflection characteristics, the frame body itself can function as a light reflection plate foam resin molding. For this reason, it is not necessary to provide a separate reflecting plate inside the frame, and the number of parts can be reduced. As a result, it is possible to obtain an LED lighting device that can realize light surface emission with a simple structure.

  In particular, by using a configuration in which the periphery of the LED light source is covered with a micro-foamed resin sheet, the use efficiency of illumination light emitted from the LED light source can be increased, and an effect of reducing power consumption can be expected. Furthermore, since the LED light source and the LED substrate are hardly heated by the reflected light of the illumination light, it is possible to reduce the deterioration of the lifetime.

Moreover, since the opening part for arrange | positioning an LED light source is provided in a frame, an LED light source can be exposed from the back side of a frame. The opening is usually formed by die-cutting after molding for the sake of vacuuming between the molded product and the mold.
In addition, since the wiring circuit for energizing the LED light source is disposed outside the side surface or top surface of the frame, the light emitting surface of the LED light source is disposed inside the frame such as the side surface or top surface of the frame. The wiring circuit and the LED light source mounting substrate are not arranged inside the frame, and the wiring circuit and the LED light source mounting substrate do not affect the function of the reflector on the inner surface of the frame. Therefore, the area occupied by the reflector on the inner surface of the frame can be maximized.

Moreover, a flexible flat cable does not shift | deviate from a frame by forming a recessed part in the side part of a frame. That is, a concave portion (shallow groove shape) is formed in the side surface portion of the frame body of the lighting device, and the flexible substrate on which the LED light source is mounted is arranged or fitted in the concave portion. The flexible flat cable does not deviate from the frame. In this way, the concave portion of the side surface portion of the frame body is formed by forming a concave portion having a shallow groove shape corresponding to the shape of the concave portion of the side surface portion of the frame body. Thus, it can be formed simultaneously with vacuum forming. The frame body and the flexible substrate may be secretly connected.

Moreover, as an optical characteristic with respect to visible light having a wavelength of 450 to 650 nm, a PET resin, a PC resin, and a flame retardant PC resin having a total reflectance of 90% or more and a diffuse reflectance of 90% or more with respect to a barium sulfate standard piece. If it is made of acrylic resin, light can be reflected efficiently.

A light diffusion plate may be provided in the opening of the bottom surface . Also, it is possible to secure the illumination without deforming the frame by using the light diffusing plate as a fixed part of the illumination.

  Moreover, an LED light source can be easily arrange | positioned in a predetermined position by mounting an LED light source in the predetermined position of a flexible flat cable. Heat generated from the LED light source can be released from the LED light source to the outside of the lighting device through the flexible flat cable. At this time, as the flexible flat cable, it is more desirable to use a flexible flat cable in which auxiliary wiring for heat dissipation and the like are arranged in addition to the current-carrying wiring.

By appropriately selecting the cross-sectional area and the surface area of the conductor used for the flexible flat cable, the heat of the LED light source can be efficiently transmitted to the conductor, and the conductor surface area becomes a heat radiation area and can be efficiently radiated to the atmosphere. In particular, when the flexible flat cable is provided on the outer periphery of the frame, heat can be radiated from the flexible flat cable to the outside of the frame, so that heat is not trapped inside the frame and the heat dissipation effect is increased. Moreover, since the frame is formed of the micro foamed resin sheet, since it has a heat insulating effect, it is possible to reduce the flow of heat from the LED light emitter into the illumination, and to reduce the temperature rise of the lighting device. Further, if the wiring circuit is formed on the outer periphery of the frame body with a flexible flat cable, the wiring is safe without being exposed to the outer peripheral portion of the frame body.
Furthermore, when a flexible substrate is affixed to the outside of the frame for the lighting device frame, it is structured to be airtightly connected so that there is no gap between the frame and the flexible substrate. Space can be separated. Intrusion of fine particles such as dust into the inside of the frame can be prevented, thereby preventing a reduction in reliability such as a decrease in the reflectance of the frame and an electrical failure of the LED light source.

  ADVANTAGE OF THE INVENTION According to this invention, a lightweight LED illuminating device can be provided with a simple structure.

FIG. 3 is an exploded perspective view showing the lighting device 1. (A) is a front view of the flexible flat cable 15, (b) is a rear view of the flexible flat cable 15. The bottom view which shows the illuminating device 1. FIG. (A) is sectional drawing of the illuminating device 1, (b) is sectional drawing of the illuminating device 1a. Sectional drawing of the illuminating device 1d. (A) The perspective view of the illuminating device 1f, (b) is the perspective view of the illuminating device 1g, (c) is the perspective view of the illuminating device 1h. Sectional drawing of the illuminating device 1b. The disassembled perspective view which shows the illuminating device 1c. Sectional drawing of the illuminating device 1c.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view showing the lighting device 1. The illumination device 1 mainly includes an upper frame 3a, a lower frame 4a, a light diffusing plate 13, a flexible flat cable 15, a cap 23, and the like. In the following description, illustration of wiring and heat dissipation structure is omitted.

  The flexible flat cable 15 is used by being rounded into a substantially circular shape so that the end portions in the longitudinal direction abut each other. Note that the ends do not need to be completely butted and a gap may be left.

  FIG. 2A is a front view showing the flexible flat cable 15, and FIG. 2B is a rear view showing the flexible flat cable 15. In the following description, illustration of the wiring to the flexible flat cable 15 is omitted.

The flexible flat cable 15 is a cable in which a circuit conductor (for example, a circuit formed of copper foil or copper wire) is covered with a resin (for example, PET, polyimide, or polyethylene naphthalate), and upper and lower surfaces thereof are covered with a laminated resin. At least a pair of circuit conductors are formed inside the flexible flat cable 15 cut to a predetermined length, and these circuit conductors are electrically connected to each other in the vicinity of the end of the flexible flat cable 15 on which the LED light source is mounted. A conductor member 21 is provided. The conductor member 21 is electrically connected to the internal circuit conductor. That is, the wiring circuit 19 is formed by the LED light source, the circuit conductor, and the conductor member 21. Instead of using the conductor member, the wiring circuit 19 may be formed by bending the conductor circuit at the end.
In addition to the LEDs, circuit components such as resistors, fuses and current limiting components can be incorporated in the wiring circuit as necessary. Here, when the laminated resin is a PET resin, an olefin-based adhesive, a polyester-based adhesive, or the like can be used as an adhesive for adhering the laminated resin.

  A plurality of LED light sources 17 are arranged on the flexible flat cable 15 at a predetermined interval. The electrode terminal of the LED light source 17 is caulked from the surface of the flexible flat cable 15 through the internal wiring circuit 19 or one of the laminated coating resins is peeled off, and the electrode terminal and the wiring circuit 19 are soldered or cooled at a low temperature. By performing brazing or the like, the LED light source 17 can be mounted by the internal wiring circuit 19. The LED light source 17 may be connected in series to the wiring circuit 19 or may be connected in parallel. Series and parallel may be combined.

Here, in the present invention, the an implementation of the LED light source to the flexible flat cable is defined as a flexible substrate.

  The upper frame 3 a has a top surface portion 7 and a side surface portion 9. The top surface portion 7 has a substantially circular shape, and a side surface portion 9 is formed at a peripheral portion of the top surface portion 7 substantially perpendicular to the top surface portion 7. That is, the side surface portion 9 has a substantially cylindrical shape, and the side facing the top surface portion 7 opens. Here, the connection part which connects the top | upper surface part 7 and the side part 9 may be formed in the shape of a smooth curve.

One or more (a plurality of openings in the figure) openings 5 are provided in the side surface 9 of the upper frame 3a. The opening 5 is a part where the light emitting part of the LED light source 17 is exposed. The openings 5 are arranged at substantially equal intervals at a predetermined interval in the circumferential direction. Here, a plurality of openings 5 can be provided as described above. However, the output of the LED light source 17 can be increased and the LED light source 17 can be arranged at one side on the side surface.
It is preferable that the frame in the vicinity of the opening 5 and the flexible flat cable 15 on which the LED is mounted are connected with an adhesive, an adhesive, or the like so that the interior and exterior of the illumination are partitioned.

  FIG. 3 is a bottom view showing the lighting device 1, and FIG. 4A is a cross-sectional view of the lighting device 1 (a cross-sectional view taken along line AA in FIG. 3). The flexible flat cable 15 on which the LED light source is mounted is disposed on the outer surface of the side surface portion 9 of the upper frame 3a. As described above, the light emitting portion of the LED light source 17 fixed to the flexible flat cable 15 is disposed on the inner surface side from the opening 5. The flexible flat cable 15 is fixed to the side surface portion 9 of the upper frame 3a with an adhesive. For example, as the adhesive used for this, a polyester-based adhesive can be used.

  As can be seen from FIG. 4A, a flange portion 8 is provided at the lower end (opening side) of the side surface portion 9 of the upper frame 3a toward the outer peripheral side. A lower frame body 4 a is provided at the lower portion of the flange portion 8. The lower frame 4a is a substantially annular member. The outer diameter of the lower frame 4a and the outer diameter of the flange portion 8 of the upper frame 3a are substantially the same. That is, when the lower frame 4a is disposed below the upper frame 3a, the lower frame 4a protrudes from the outer periphery of the side surface of the upper frame 3a by a predetermined length in the center direction. Here, although not particularly illustrated, the present invention is not limited to FIG. 4, and in the embodiment of the present invention, the connection between the top surface portion 7 and the side surface portion 9 of the upper frame body and between the side surface portion 9 and the flange portion 8 are moderate. Needless to say, a roundness can be provided, and the angle between the top surface portion 7 and the side surface portion 9 of the upper frame can be appropriately provided in consideration of the draft angle during molding.

  The top surface portion 7 and the side surface portion 9 of the upper frame body 3a and the bottom surface portion 11 of the lower frame body 4a are collectively referred to as a frame body. The frame body of the present invention is a frame body for an LED lighting device, and the top surface portion 7 and the bottom surface portion 11 having the opening 6 face each other, and the side surface portion 9 is provided so as to connect the top surface portion 7 and the bottom surface portion 11. It is done.

  A light diffusion plate 13 is provided inside the upper frame 3a and above the lower frame 4a as necessary. The lower frame 4a is fixed to the lower end (flange 8) of the side surface portion 9 of the upper frame 3a by a cap 23, and the light diffusion plate 13 is disposed on the lower frame 4a so as to be in contact with the lower frame 4a. . Thereby, the light diffusing plate 13 is arrange | positioned so that the opening part 6 of the bottom face part 11 may be plugged up. For example, the light diffusing plate 13 is made of light-transmitting glass or resin, and the light diffusing plate 13 can be fixed to the frame by bonding the contact surface with the lower frame 4a. The light diffusing plate 13 diffuses part of the illumination light incident on the light diffusing plate 13 into the illumination when the light is transmitted. For this reason, by using the light diffusing plate 13, the light irradiated from the LED light source 17 and diffusely reflected in the frame can be further diffused.

  If the lower frame 4a and the upper frame 3a are directly joined as in the lighting device 1a shown in FIG. 4B, the cap 23 may not be used to hold the light diffusion plate 13. .

  In this case, the light diffusion plate 13 fixes the upper frame 3a to the lower frame 4a before joining the upper frame 3a and the lower frame 4a. Since the light diffusing plate 13 is larger than the size of the opening 6 of the bottom surface portion 11, the light diffusing plate 13 is arranged on the lower frame, or after being arranged and fixed, the upper frame 3 a and the lower frame 4 a The lighting device 1a can be assembled by joining the two.

  Further, the lower frame 4a may be disposed above the light diffusion plate 13 as in the lighting device 1d shown in FIG. By doing in this way, light can be more efficiently reflected by the lower frame 4a. For this reason, more uniform light can be extracted from the light diffusion plate 13. Moreover, since it becomes difficult to see the LED light source arrange | positioned at the side surface, the light which directly injects into a light-diffusion reflection board from an LED light source can be reduced, and it can be set as a surface emitting illumination device with less glare.

  Here, the upper frame body 3a and the lower frame body 4a are formed of 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 the thickness of the non-foamed layer is 10 to 30 μm. The thickness of the foamed layer is a value obtained by subtracting the thickness of the non-foamed layer from the thickness of the microfoamed resin sheet. That is, the thickness of the non-foamed layer is a substantially constant value even when the total thickness of the microfoamed resin sheet is increased. The reason for this is that the non-foamed layer is formed by the foaming gas escaping from the surface of the sheet in the manufacturing process of the micro-foamed resin sheet, and the thickness of the layer formed thereby is from the surface of the micro-foamed resin sheet. This is because it depends on the distance.

  The microfoamed resin sheet of the present invention preferably has an average cell diameter in the range of 0.2 μm to 40 μm. Here, if the average bubble diameter is less than 0.2 μm, the light transmittance increases and the reflectance decreases. 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.

The micro-foamed resin sheet used for the frame for the LED lighting device is made of a thermoplastic resin, and has optical reflectivity with respect to the barium sulfate standard piece when the barium sulfate standard piece is used as an optical characteristic for visible light having a wavelength of 450 to 650 nm. The total reflectance is 90% or more, the diffuse reflectance is 90% or more, and the wavelength dependence of the light reflectance is in the range of 1% or less. Both the total reflectance and the diffuse reflectance are preferably 95% or more, and can be 99% or more. In addition, the optical characteristics of the LED lighting device frame formed by molding the micro-foamed resin sheet with respect to visible light having a wavelength of 450 to 650 nm are similar to the micro-foamed resin sheet before molding. Since it does not change greatly , the total reflectance can be 90% or more and the diffuse reflectance can be 90% or more as the light reflectance with respect to the barium sulfate standard piece . Furthermore, the wavelength dependency of the light reflectance with respect to the barium sulfate standard piece can be made within 2% if the thickness of the molded product is 1 mm or more. Further, in the case of pattern forming by bending rather than vacuum forming, the light reflectivity of the frame can maintain the same light reflectivity as that of the sheet of the micro-foamed resin sheet except for the bent portion.

Here, the micro-foamed resin sheet of the present invention is an insulating substrate, and its volume resistivity is 10 ¹² Ω to 10 ¹¹ Ω. If it is this range, the insulation in this invention can fully be ensured.

  In the present invention, the microfoamed resin sheet is composed 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. 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 which gave antistatic, a flame retardance provision, the ultraviolet-resistant coating according to a use place and an application, or such a process.

  In the present embodiment, the top surface portion 7, the side surface portion 9, and the bottom surface portion 11 are all formed of a micro-foamed resin sheet having excellent light reflection characteristics, but the top surface portion 7, the side surface portion 9, In addition, at least two surfaces of the bottom surface portion 11 need only be formed of a microfoamed resin sheet having light reflection characteristics. For example, only the top surface portion 7 and the side surface portion 9 of the upper frame 3a are microfoamed. You may form with a resin sheet. Of course, the side surface portion 9 and the bottom surface portion 11 can be processed by vacuum molding or match mold molding in which a convex mold and a concave mold are sandwiched.

  In the present embodiment, the upper frame 3a is integrally formed. That is, the top surface portion 7 and the side surface portion 9 are integrally formed. For example, using a developed pattern paper in which the side surface portion 9 is formed on the outer periphery of the top surface portion 7, the side surface portion 9 is bent, and the end portions of the side surface portion 9 and the top surface portion 7 and the butt portions of the side surface portion 9 are bonded to each other. Can be integrated.

Moreover, you may shape | mold integrally the top | upper surface part 7 and the side part 9 by the vacuum forming method. For example, a micro-foamed resin sheet made of a thermoplastic resin such as a PET resin, a PC resin, a flame retardant PC resin, or an acrylic resin is softened by heating with a heater, and the softened sheet is sucked into a mold. In addition, the boundary between the two surfaces of the top surface portion 7 and the side surface portion adjacent to each other can be integrally formed by bending. At this time, the pressure between the molding material and the molding die can be usually 1 kg / cm ² or less. Here, the micro-foamed resin sheet after heat forming such as vacuum forming or match mold forming is before and after heating, and the optical characteristics such as total reflectivity and diffuse reflectivity are almost the same, and the total reflectivity and diffuse reflectivity are 90%. % Or more can be satisfied.

  As mentioned above, according to this Embodiment, since the frame (upper frame 3a, lower frame 4a) of the illuminating device 1 is made of the micro foaming resin sheet which is excellent in a light reflection characteristic, it reflects the whole inner surface of a frame. Can function as a board. Moreover, since the flexible flat cable 15 which mounted the LED light source is arrange | positioned in the outer peripheral surface of the side part 9 of the upper frame 3a, there are few parts, a structure is simple and lightweight, and it can obtain the surface emitting illuminating device. it can. By forming the frame body using vacuum forming or match mold forming, it is possible to form the frame body even if the shape of the lighting device is curved, realizing high design and surface emitting illumination it can. Further, depending on the shape of the lighting device, in addition to the above-described vacuum forming and match mold forming, it is possible to form a frame body using unfolded pattern paper. Therefore, even if the frame has a complicated shape such that a rigid reflector cannot be mounted, excellent reflection characteristics can be provided at any position of the frame.

Further, since the top surface portion 7 and the side surface portion 9 are integrally formed and it is not necessary to provide a reflecting plate, the handling property is good and the assembling workability is also excellent.
Moreover, since the frame is made of a micro foam resin, it has high flexibility and excellent shape recoverability although it is not high in strength. Further, by reinforcing with the light diffusing plate 13 and the cap 23 and further using them as fixed portions, it is possible to prevent the frame from being affected by stress or distortion due to handling or attachment.

  Moreover, since the LED light source 17 is arrange | positioned at the outer peripheral surface side of the upper frame 3a, and the bottom face part 11 has projected in the center direction of the illuminating device 1, the LED light source 17 is hard to see and an LED light source is not conspicuous. By combining this with the light diffusing plate 13, it is possible to realize illumination in which the LED light source 17 is not noticeable and is not dazzling (no glare).

  Here, when the LED light source 17 of the illuminating device 1 is caused to emit light, the light from the LED light source 17 is not directly irradiated, but the diffuse reflection on the inner surface of the illuminating device 1 (frame body) is repeated and the bottom surface portion 11 is irradiated. It irradiates from the opening part 6 (light extraction part). Therefore, the light can be uniformly diffused downward and irradiated from the light diffusion plate 13 outward without using a lens or the like. As a result, it is possible to produce an indirect illumination effect that is soft and calm, with no uneven illumination or shadows.

  Next, another embodiment of the first embodiment will be described. The upper frame 3d of the lighting device 1f in FIG. 6A is formed by vacuum forming in the same manner as in FIGS. 1 to 4, and the top surface portion 7, the side surface portion 9, and the flange portion 8 of the frame body of the LED lighting device are integrally formed. Is. The difference from FIG. 4 is that the illumination device 1f is not a thin cylindrical illumination as shown in FIG. The upper frame 3d has a substantially truncated cone shape in which the side surface portion 9 gradually increases in diameter from the top surface portion 7, and at the boundary between the side surface portion 9 and the flange portion 8, the flange portion 8 has a flange shape and is substantially parallel to the top surface portion 7. It is formed in a shape that expands outward.

  In FIG. 6A, the LED light source extends from one side of the side surface portion 9 of the upper frame 3d to the other side of the side surface portion 9 (position facing one side) through the center of the top surface portion 7. The flexible flat cable 15 mounted with 17 is bonded. When the flexible flat cable 15 on which the LED light source 17 is mounted is attached to the upper frame 3d, the LED light source 17 is arranged so that the LED light source 17 is disposed at a position corresponding to the opening formed in the upper frame. A flexible board mounted in advance on the flexible flat cable 15 is used.

  The upper frame 3e of the illuminating device 1g in FIG. 6B has substantially the same shape as the frame in FIG. 6A, and the flexible flat cable 15 on which the LED light source 17 is mounted is provided on the top surface portion 7. It passes through the center and is arranged so as to straddle the mutually facing parts of the side part 9. The upper frame 3e has a depth corresponding to the thickness of the flexible flat cable 15 in a portion where the flexible flat cable 15 is disposed so that the flexible flat cable 15 mounted with the LED light source 17 disposed on the side surface portion 9 is not easily displaced. A recess 10 is provided which is recessed on the inclined surface of the truncated cone of the side surface 9 of the upper frame 3e. By making the upper frame 3e into the shape as described above, the flexible flat cable 15 is not displaced. Thus, in FIG. 6B as well, a flexible substrate in which the LED light source 17 is mounted in advance on the flexible flat cable 15 can be used.

  The upper frame 3f of the lighting device 1h in FIG. 6C has substantially the same shape as the frame in FIG. 6A, but the flexible flat cable 15 on which the LED light source 17 is mounted is shown in FIG. ), The central portion of the side surface portion 9 is arranged in the circumferential direction. Furthermore, the flexible flat cable is arranged at a position where the flexible flat cable 15 mounted with the LED light source 17 is disposed on the upper frame 3f so that the flexible flat cable 15 mounted with the LED light source 17 disposed on the side surface portion 9 is not easily displaced. A recess 10 that is recessed in the circumferential direction of the side surface 9 is provided by a depth corresponding to a thickness of 15. In this way, the recess is formed in the frame, the recess is used as the mold, and even if there is an undercut, the depth of the recess is shallow, so the mold is pressed by pressing the frame in the circumferential direction after molding. Can be removed. Of course, if a split mold or the like is used, die cutting is possible.

  In FIG. 6C as well, a flexible substrate in which the LED light source 17 is mounted in advance on the flexible flat cable 15 can be used.

  In addition to the above, only a portion where the LED light source 17 is disposed and the vicinity thereof may be a substantially rectangular plane. In this way, the LED light source is disposed on the frame body in a stable manner by forming the portion where the LED light source is disposed on a substantially rectangular plane that matches the size of the frame portion including the terminal portion of the LED light source. can do.

  Here, although not particularly illustrated, it is desirable to have a structure that is airtightly connected so that there is no gap between the frame and the flexible substrate when the flexible substrate is attached to the outside of the frame. By doing in this way, the space inside and outside the frame can be separated. Thereby, intrusion of fine particles such as dust into the inside of the frame can be prevented, and deterioration in reliability such as a decrease in reflectance inside the frame and an electrical failure of the LED light source can be prevented.

As described above, the width of the flexible flat cable 15 so that the flexible flat cable 15 on which the LED light source 17 is mounted can be arranged or fitted to the side surface portion 9 of the frame of the lighting device. A recess 10 is formed in accordance with the above.
In the present invention, even when only one LED light source is used, surface light emission can be realized by using a light diffusion plate. When it is desired to increase the illuminance, it is possible to use a plurality of LED light sources.

  Next, a second embodiment will be described. FIG. 7 is a cross-sectional view of the lighting device 1b. In the following description, components having the same functions as those of the lighting device 1 and the like are denoted by the same reference numerals as those in FIGS.

  Although the illuminating device 1b is the structure similar to the illuminating device 1, the structure of a frame differs. The frame body of the lighting device 1b includes an upper frame body 3b and a lower frame body 4b. The lower frame body 4 b includes a bottom surface portion 11 and a side surface portion 9. A flange portion 8 is provided at the upper end of the side surface portion 9 toward the outer peripheral side.

  The upper frame 3b is joined to the upper portion of the flange portion 8. The upper frame 3 b constitutes the top surface portion 7. The upper frame 3b is a substantially disk-shaped member. The outer diameter of the upper frame 3b and the outer diameter of the flange portion 8 of the lower frame 4b are substantially the same.

  The lower end of the side surface portion 9 of the lower frame 4b protrudes by a predetermined length inward in the center direction. That is, the bottom surface portion 11 is formed in an annular shape, and the opening 6 is provided in the central portion. The light diffusion plate 13 larger than the size of the opening 6 of the bottom surface portion 11 is disposed on the top of the bottom surface portion 11. That is, the light diffusing plate 13 is disposed so as to close the opening 6 of the bottom surface portion 11. Further, the light diffusing plate 13 may be attached to the upper portion of the bottom surface portion 11 with an adhesive. In addition, after arrange | positioning the light diffusing plate 13 in the lower frame 4b, the upper frame 3b is joined to the upper part of the flange part 8 of the lower frame 4b. Here, the opening 6 may be formed by die cutting or laser processing after vacuum forming the frame.

  In the present embodiment, the upper frame body 3b and the lower frame body 4b are preferably formed of a micro-foamed resin sheet. For example, the two surfaces of the side surface portion 9 and the bottom surface portion 11 of the lower frame body 4b are used. Only the micro foamed resin sheet may be formed.

  Moreover, the lower frame 4b is comprised integrally. That is, the bottom surface portion 11 and the side surface portion 9 are integrally formed. In this case, for example, using the developed pattern paper in which the side surface portion 9 is formed on the outer periphery of the bottom surface portion 11, bending the side surface portion 9, and bonding the end portions of the side surface portion 9 and the bottom surface portion 11 together. Can do. When forming a frame body using unfolded pattern paper, it is desirable to make shallow cuts or grooves in the microfoamed resin sheet at the fold line position of the fold portion by a cutter or a roller to make it easy to fold. By doing in this way, a micro foaming resin sheet becomes easy to bend and a frame becomes easy to assemble. Further, as described above, the bottom surface portion 11 and the side surface portion 9 may be integrally formed by a vacuum forming method. In the case of forming the frame body using the unfolded pattern paper, the frame body can maintain the optical characteristics of the micro-foamed resin before molding since it is not deformed except for the folding line.

  According to the second embodiment, an effect similar to that of the first embodiment can be obtained. Thus, the frame which comprises an illuminating device should just comprise at least any one of the top | upper surface part 7 and the side part 9 or the side part 9 and the bottom part 11 integrally.

  Next, a third embodiment will be described. FIG. 8 is an exploded perspective view of the lighting device 1c, and FIG. 9 is a cross-sectional view of the lighting device 1c. The lighting device 1c is substantially the same as the lighting device 1 and the like, but differs in that the frame is formed in a substantially rectangular shape.

  The frame body of the lighting device 1c includes an upper frame body 3c and a lower frame body 4c. The lower frame body 4 c includes a bottom surface portion 11 and four side surface portions 9. A flange portion 8 is formed outward at the upper end of the side portion 9 on the long side and the upper end of the side portion 9 on the short side, and the upper frame 3 c is joined to the upper portion of the flange portion 8.

  The upper frame 3c is a substantially rectangular member. The upper frame 3 c constitutes the top surface portion 7. The outer shape of the upper frame 3c and the outer shape of the flange portion 8 of the lower frame 4c are substantially the same. The light diffusing plate 13 larger than the opening size of the bottom surface portion 11 is disposed on the top of the bottom surface portion 11. That is, the light diffusing plate 13 is disposed so as to close the opening 6 of the bottom surface portion 11. In addition, the light diffusing plate 13 can be affixed and fixed to the bottom face part 11 of the lower frame 4c with an adhesive agent, an adhesive, etc. as needed. After the light diffusing plate 13 is disposed in the lower frame 4c, the upper frame 3c is joined to the upper portion of the flange portion 8 of the lower frame 4c.

  A plurality of openings 5 are provided in the side surface portion 9 on the long side of the lower frame 4c. Moreover, the flexible flat cable 15 is provided in the outer peripheral surface of the side part 9 by the side of the long side of the lower frame 4c. Therefore, the LED light source 17 is exposed on the inner surface side of the long side surface of the frame of the lighting device 1c. In the illustrated example, a pair of flexible flat cables 15 mounted with LED light sources are used. However, the flexible flat cables 15 mounted with LED light sources may be arranged so as to be wound around the entire circumference of the side surface portion 9. At this time, the LED light source 17 may be disposed on the side portion 9 on the short side.

  The side surface portion 9 of the lower frame 4c where the LED light source 17 is disposed is formed to be inclined so as to spread upward (to the top surface portion 7 side). That is, the LED light source 17 irradiates light slightly toward the top surface 7 side.

In the illuminating device 1 c, a part of the light emitted from the LED light source 17 is reflected by the top surface portion 7, and further, a part of the reflected light is repeatedly reflected by the bottom surface portion 11 and the top surface portion 7, and then the light diffusing plate 13. It irradiates from the opening part 6 of the illuminating device 1c.
A part of the reflected light incident on the light diffusing plate 13 is transmitted, but a part is reflected and returns to the inside of the illumination. By repeating reflection in this way, surface-emitting illumination is obtained.

  In this embodiment, the upper frame body 3c and the lower frame body 4c are preferably formed of a micro foamed resin sheet. For example, the two surfaces of the side surface portion 9 and the bottom surface portion 11 of the lower frame body 4c are used. Only the micro foamed resin sheet may be formed.

  The lower frame 4c is integrally formed. That is, the bottom surface portion 11 and the side surface portion 9 are integrally formed. In this case, for example, using the developed pattern paper in which the side surface portion 9 is formed on the outer periphery of the bottom surface portion 11, bending the side surface portion 9, and bonding the end portions of the side surface portion 9 and the bottom surface portion 11 together. Can do. Further, as described above, the bottom surface portion 11 and the side surface portion 9 may be integrally formed by a vacuum forming method. Here, the opening 6 may be formed by die cutting or laser processing.

  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. Moreover, in each embodiment mentioned above, although the example which provides the opening part 5 in the side part 9 and arrange | positions an LED light source was shown, the opening part 5 was provided in the top | upper surface part 7, and the LED light source was arrange | positioned in the top | upper surface part 7. Also good. In this case, what is necessary is just to arrange | position the flexible flat cable 15 which mounted LED in the outer side (back side) of the top | upper surface part 7. FIG.

1, 1 a, 1 b, 1 d, 1 f, 1 g, 1 h... Lighting devices 3 a, 3 b, 3 c, 3 d, 3 e, 3 f ............ Upper frame body 4 a, 4 b, 4 c. ...... Opening 6 ...... Opening 7 ...... Top 8 ...... Flange 9 ...... Side 10 ...... Depression 11 ...... Bottom 13 ...... Light diffusing plate 15 ...... Flexible flat cable 17 ... LED light source 19 ... Wiring circuit 21 ... Conducting member 23 ... Cap

Claims (8)

In a lighting device having a frame made of a top surface portion, a bottom surface portion having an opening, and a side surface portion connecting the top surface portion and the bottom surface portion,
The frame is molded from a microfoamed resin sheet in which at least two surfaces of the top surface portion, the side surface portion, and the bottom surface portion have light reflection characteristics,
Furthermore, the frame itself also serves as a light reflecting plate foamed resin molded body,
An opening for arranging the LED light source is provided in the side surface or the top surface,
The light emitting surface of the LED light source is located on the inner surface side of the opening of the light reflecting plate foamed resin molded body,
A flat flexible flat cable on which the LED light source is mounted,
It is arranged so as to be exposed along the outer surface side of the light reflecting plate foamed resin molded body, and is adhered to the outer surface of the light reflecting plate foamed resin molded body, and the inner surface side of the light reflecting plate foamed resin molded body is The LED is used as a light reflecting plate, and an outer surface side of the light reflecting plate foamed resin molded body is used as a support surface of a substrate on which the flat flexible flat cable on which the LED light source is mounted is disposed. Lighting device.   The inner surface of the light reflecting plate foamed resin molded body is a light reflecting plate, and a concave portion that matches the width of the flat flexible flat cable is formed on the outer peripheral surface of the side surface that is the outer surface of the light reflecting plate foamed resin molded body. The LED lighting device according to claim 1, wherein the LED lighting device is arranged or fitted along the flat flexible flat cable in which the LED light source is mounted in the concave portion.   When the light reflecting plate foamed resin molded body has a cylindrical shape, a substantially truncated cone shape, or a substantially truncated pyramid shape, and the light reflecting plate foamed resin molded body has a substantially truncated cone shape, the top surface portion and the side surface portion In addition, when the flange portion is formed substantially parallel to the top surface portion, and the frame body has a substantially truncated pyramid shape, the side surface portion of the light reflecting plate foamed resin molded body extends from the bottom surface portion. The LED lighting device according to claim 1, wherein the LED lighting device is formed so as to expand toward a flange portion of the top surface.   The LED lighting device according to any one of claims 1 to 3, wherein the flat flexible flat cable has a preliminary wiring for heat dissipation.   5. The LED lighting device according to claim 1, wherein a light diffusing plate is disposed in an opening portion of the bottom surface portion formed from the micro-foamed resin sheet. The light reflecting plate foamed resin molded product has a light reflectance of 90% or more with respect to the barium sulfate standard plate when the barium sulfate standard piece is used as an optical characteristic for visible light having a wavelength of 450 to 650 nm. The LED lighting device according to claim 1, wherein the LED lighting device has a light reflectance of 90% or more. When the plate thickness of the light reflecting plate foamed resin molding is 1 mm or more, the wavelength dependency of the light reflectance of the barium sulfate standard plate with respect to visible light having a wavelength of 450 to 650 nm is within 2%. The LED lighting device according to claim 6. The LED lighting device according to any one of claims 1 to 7, wherein the light reflecting plate foamed resin molded body is made of any one of a PET resin, a PC resin, a flame-retardant PC resin, and an acrylic resin. .

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