JP2014026967A - Led lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical component that suppresses the position displacement between an LED and light guide plate incident face, attains stable optical characteristics, and can emit light from not one side of the light guide plate but both sides thereof with respect to the LED.SOLUTION: An LED lighting device includes an LED light source and a light guide plate. The light guide plate includes a light-incident part for taking light from the LED light source into the inside of the light guide plate, a bent part for bending a path of the light taken in from the light-incident part, a first light-emitting part for emitting the light having passed through the bent part, and a flange part that interposes the light-incident part, is positioned in a direction opposite to the bent part and has a second light-emitting part for emitting light.

Description

  The present invention relates to an optical component of an LED lighting device using an LED (light emitting diode) as a light source.

  At present, the replacement of the fluorescent lamp illumination device with an LED illumination device using a light emitting diode (LED) as a light source is in progress.

  This is because there is a problem at the time of disposal in terms of environmental friendliness because of the very small amount of mercury contained in fluorescent lamps, and a completely mercury-free lighting device can be realized by replacing it with an LED lighting device. is there. Moreover, although an inverter and a ballast are required for a fluorescent lamp, since it is not necessary for an LED lighting device, power consumption can be reduced. On the other hand, incandescent bulbs do not have problems with mercury, inverters, etc., but have lower luminous efficiency and shorter life than fluorescent lamps, so replacement with LED lighting devices can also reduce power consumption and extend life. Against this background, various LED lighting devices have been proposed and put into practical use.

  The LED illumination device itself is uncomfortable when the LED element itself as the light source has high brightness and is directly viewed. For this reason, by using the light guide plate to spread the light and use it as a surface light source, the illuminance of the irradiated surface is not reduced, and the local luminance of the light emitting surface of the LED lighting device itself can be kept low.

  As an LED lighting device using a light guide plate, there is a device in which a light guide direction in which light in the light guide plate travels and a direction of light emitted from the LED are perpendicular to each other. FIG. 12A shows a cross-sectional view of Patent Document 1, and FIG. 12B shows a cross-sectional view of Patent Document 2. 12 (a) and 12 (b) includes an LED 110 and a light guide plate 111. The light guide plate 111 has a bent portion 112 that bends light and an output portion 120 that emits light. .

  In the structure described in Patent Document 1 and Patent Document 2, after the light emitted from the LED 110 that is the light source enters the light guide plate 111 from the light incident surface 104 of the light guide plate 111 disposed immediately above the LED 110, the bent portion By the total reflection at 112, the traveling direction is changed to a light guide direction 108 that is substantially parallel to the emitting portion 120 of the light guide plate 111. As a result, the light guide direction 108 in the light guide plate 111 and the light emission direction 107 from the LED 110 have a substantially vertical relationship.

JP 2008-34155 A JP 2008-103301 A

  13A and 13B are enlarged cross-sectional views around the LED 110. FIG. FIG. 13A shows a cross-sectional view when the peripheral portion does not emit light at all with respect to the light guide direction 108. FIG. 13B shows a cross-sectional view when light leaks in a direction perpendicular to the light guide direction 108 and is too light. In other words, the light guide plate 111 in the vicinity of the LED 110 does not shine or is too light due to the leaked light 102. In particular, in the leaked light 102 in FIG. 13B, color unevenness may occur due to light in various directions.

  Since the above occurs due to the positional relationship between the LED 110 and the light guide plate 111, it is only necessary to make the alignment accurate and fix it firmly. However, in order to make the alignment accurate and firmly fixed, it is necessary to fix the bent portion 112 of the light guide plate 111 or the emitting portion 120 in the vicinity of the bent portion 112 with a fixing portion or the like. In this case, total reflection characteristics may be lost due to distortion. In addition, a non-light emitting portion (shadow) or unevenness may occur due to a through hole or a fixed portion provided in the light guide plate 111. In addition, when the light guide plate 111 is not firmly fixed, it is difficult to keep the positional relationship between the LED 110 and the light incident surface of the light guide plate 111 constant. Will not be stable. In this case, in general, the light incident efficiency to the light guide plate 111 and the luminance distribution on the exit surface of the light guide plate 111 vary.

  Moreover, in the case where it is desired to emit light on the entire surface including the outer periphery of the LED lighting device, the structures of Patent Document 1 and Patent Document 2 cannot be realized.

In order to solve the above-mentioned problem, the light guide plate includes an LED light source and a light guide plate, and the light guide plate takes in light from the LED light source into the light guide plate, and a light path taken in from the light input portion. A first light emitting unit that emits light that has passed through the bent unit, and a second light emitting unit that emits light and is positioned in the opposite direction to the bent unit. The collar,
An LED lighting device is used.

  The light emitted from the LED enters the light guide plate, and part of the light is changed in the light guide direction at the light bending portion, and the remaining light enters the collar portion. As a result, it is possible to guide and emit light in two directions with respect to the LED by arranging the collar, and to stabilize optical characteristics by simply fixing the vicinity of the LED of the light guide plate. it can.

(A) LED fluorescent lamp in Embodiment 1 of the present application, (b) Enlarged sectional view of (a) (A)-(d) End part expanded sectional view of the LED lighting apparatus of Embodiment 2 of this application. (A)-(c) The expanded sectional view of the 1st light emission part of the LED lighting apparatus of Embodiment 3 of this application. (A)-(b) End part expanded sectional view of the LED lighting apparatus of Embodiment 4 of this application (A)-(b) End part expanded sectional view of the LED lighting apparatus of Embodiment 5 of this application (A)-(b) End part expanded sectional view of the LED lighting apparatus of Embodiment 6 of this application (A)-(c) End part expanded sectional view of the LED lighting apparatus of Embodiment 7 of this application (A)-(b) End part expanded sectional view of the LED lighting apparatus of Embodiment 8 of this application (A)-(d) End part expanded sectional view of the LED lighting apparatus of Embodiment 9 of this application (A) The perspective view of the light-guide plate in Embodiment 10 of this invention, (b) The edge part expanded sectional view of the LED lighting apparatus in Embodiment 10 of this invention. (A)-(d) End part expanded sectional view of the LED lighting apparatus of Embodiment 11 of this application (A) Cross-sectional view of a conventional LED lighting device, (b) Cross-sectional view of a conventional LED lighting device (A) End enlarged sectional view of a conventional LED lighting device, (b) End enlarged sectional view of a conventional LED lighting device

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
The light guide plate 111 according to the first embodiment of the present invention will be described with reference to FIGS. 1 (a) and 1 (b).

  Fig.1 (a) is a perspective view of the disk-shaped lighting fixture in Embodiment 1 of this invention, FIG.1 (b) is an expanded sectional view of LED110 part periphery of the fixture.

  The lighting fixture includes an LED 110 mounted on a substrate 115 and a light guide plate 111 that transmits and emits light from the LED 110.

  The LEDs 110 are light sources. In this case, the LEDs 110 are arranged in a circular shape in order to constitute a circular illumination device. The LED 110 has a length of 3.0 mm, a width of 1.4 mm, and a thickness of 0.52 mm. The LED 110 is mounted on the substrate 115. The prism groove 131 is provided with a groove concentrically with the arrangement of the light sources. The LED 110 is controlled by the substrate 115.

  The light guide plate 111 includes a bent portion 112 obtained by bending the light guide plate 111, a first light emitting portion 113 that emits light, and a prism groove 131 that reflects light in the light emitting direction in the first light emitting portion 113, It has a collar part 114 having a fixing part 116 for fixing to a ceiling or the like.

  The bending portion 112 is adjacent to the light incident region 124 and is where the light is bent. The outer peripheral surface is a total reflection region 122 that totally reflects light. Moreover, the bending part 112 consists of a curved surface, and is 10 mm in outer diameter and 7 mm in internal diameter. The bending part 112 connects the collar part 114 and the 1st light emission part 113, The cross-sectional shape is an arc shape.

  The first light emitting unit 113 is a flat plate having a thickness of 3 mm that is adjacent to the bent portion 112 and continues from the bent portion 112. Light is received from the bent portion 112 and light is emitted from the upper surface thereof. A prism groove 131 is located on the lower surface. The prism groove 131 increases the depth of the prism groove 131 from the shallow portion toward the center of the instrument from the vicinity (boundary) of the connection between the bent portion 112 and the first light emitting portion 113. The depth of the prism groove 131 is 100 μm or less, and the depth is variable. Alternatively, the pitch between the prism grooves 131 may be reduced from the 500 μm level to the 100 μm level near the connection between the bent portion 112 and the first light emitting portion 113. As a result, the light emitted from the first light emitting unit 113 can be made uniform on the disk or emitted with a desired luminance distribution.

  The collar portion 114 is located on the opposite side of the first light emitting portion 113 with the bent portion 112 interposed therebetween. The collar portion lower surface 114b has a total reflection region 142 that is a surface that totally reflects the guided light. The collar portion 114 has a flat plate shape, and its length L is preferably 3 mm or more in order to fix the light guide plate 111. The length L of the collar portion 114 was set to 50 mm in order to ensure the role of guiding light in the direction of the sub light guide direction 201 in FIG. The thickness T indicates the thickness of the collar portion 114. Light is emitted from the upper surface of the collar portion 114. Here, let the upper surface of the collar part 114 be a 2nd light emission part.

  The light incident region 124 is a partial region of the collar portion lower surface 114 b and is directly above the LED 110 and is a portion where light enters the light guide plate 111.

  The main light guide direction 200 is a diagram showing a direction in which light entering from the light incident region 124 of the light guide plate 111 is guided, and this direction is the main light direction. The sub light guide direction 201 is a diagram showing a direction of light guide in the direction of the collar portion 114, and is a sub light guide direction. The amount of light in the main light guide direction 200 is larger than the amount of light in the sub light guide direction 201.

  The material of the light guide plate 111 is an acrylic material. When heat resistance is required, polycarbonate may be used. The light guide plate 111 has a uniform thickness T and is often 10 mm or less. In this embodiment, since molding is performed by injection molding, the balance of strength, molding time, and material weight is studied to reduce the molding cost, and the thickness is set to 3 mm. The preferable thickness setting of the light guide plate 111 is a molded part, so it is desirable to design it with a uniform thickness as much as possible. However, in order to increase the degree of freedom in optical design, at least the bent portion 112 and the first thickness are set. The light emitting part is designed to have a thickness of 1 mm or more and 10 mm or less. The flange portion 114 is a flat plate having a thickness of 3 mm continuous from the light incident region 124. Even if the degree of freedom in optical design is expanded, at least the thickness of the collar portion 114 is designed to be 1 mm or more and 5 mm or less.

  The fixing part 116 is located at the end of the collar part 114, presses the collar part 114, and fixes the entire light guide plate 111. As shown in FIG. 1A, the fixing part 116 is fixed at about four locations on the circumference. Such as screws. The light guided by the collar portion 114 is mainly emitted at a portion without the fixing portion 116, and the fixing portion 116 is arranged so that the light is not influenced by the position.

  The light guide plate 111 is disposed so that the light incident region 124 is located immediately above the LED 110. In the light guide plate 111, the distance between the light incident region 124 and the LED 110 is set to 0.5 mm.

  A part of the light incident from the light incident region 124 is mainly bent in the total reflection region 122 through the bending portion 112 in the direction of the leading light direction 200 and guided to the first light emitting portion 113 to be prism. Light is emitted from the first light emitting unit 113 through the groove 131. Further, part of the light incident from the light incident region 124 is guided through the collar portion 114 and emitted from the collar portion 114.

  In this embodiment, since the light of the LED 110 is divided into the first light emitting unit 113 and the collar unit 114, the light is also emitted around the LED 110, and the periphery of the LED 110 is not dark.

  Further, since the fixing portion 116 is provided on the collar portion 114, the influence of the fixing portion 116 does not reach the bending portion 112, so that light is guided.

(Embodiment 2)
The second embodiment relates to the collar portion 114 of FIG. 1B in the first embodiment. Other configurations are the same as those of the first embodiment.

  FIGS. 2A to 2D are partial perspective views of the flange portion 114 shown in FIG.

  In FIG. 2A, the collar upper surface 114a is a second light emitting part from which light is emitted, and the collar lower surface 114b facing the collar upper surface 114a has a prism groove 131, and the prism groove 131 is A plurality of ribs 114 are formed perpendicular to the longitudinal direction of the collar portion 114.

  The light applied to the prism groove 131 is reflected and guided to the upper surface of the prism groove 131. Light can be emitted efficiently. The prism groove 131 is a triangular prism-like groove and reflects light. Since the light guide plate 111 has a disk shape, the prism groove 131 is formed along the outer periphery. The prism groove 131 is a triangular prism-shaped concave, and reflects light in the light emitting direction by being totally reflected between the inclined surfaces.

  In FIG. 2B, a convex triangular prism groove 132 is disposed on the flange lower surface 114b. Both the width and the height of the triangular prism groove 132 are 100 μm or less. The tip in the cross section may have an R shape.

  In FIG.2 (c), the concave cone 133 is arrange | positioned at the collar part lower surface 114b. The diameter and depth of the cone 133 are both 500 μm or less. The vertex in the cross section may have an R shape.

  The cones 133 are provided in the number of several hundred to several thousand on the collar lower surface 114b.

  In FIG.2 (d), the convex cone 134 is arrange | positioned at the collar part lower surface 114b. The width and height of the cone 134 are both 500 μm or less. The apex portion in the cross section may have an R shape. The cones 134 are provided in the number of several hundred to several thousand on the collar lower surface 114b.

  The light guided through the collar portion 114 is incident and reflected on the concave triangular prism groove 132, the convex triangular prism groove 132, the concave cone 133, and the convex cone 134, so that the traveling direction of the light Changes, and light can be emitted from the top surface 114a of the collar portion and emitted in a planar shape.

  Among the above examples, the 131 prism groove of FIG. 2A is the most preferable example because of workability and ease of control of the light emission direction.

(Embodiment 3)
The third embodiment relates to the first light emitting unit 113 in the first embodiment. Other configurations are the same as those of the first embodiment. In the first embodiment, the concave prism groove 131 is provided on the lower surface of the first light emitting unit 113, but the following is another example.

  FIG. 3A is an enlarged perspective view of the first light emitting unit 113 of the light guide plate 111. A convex triangular prism groove 132 is disposed on the bottom surface 123 of the first light emitting unit. Both the width and the height of the triangular prism groove 132 are 100 μm or less. The tip in the cross section may have an R shape. The light that has been guided to the first light emitting unit 113 is incident on and reflected by the triangular prism groove 132, thereby changing the traveling direction of the light. ) To emit light in a planar shape. The triangular prism groove 132 is a triangular prism-like convex, and reflects light in the light emitting direction (upward) by totally reflecting light between the inclined surfaces. As shown in FIG. 1A, since the light guide plate 111 has a disk shape, the triangular prism groove 132 is formed along the outer periphery.

  In FIG. 3B, a concave cone 133 is disposed on the bottom surface 123 of the first light emitting unit. Both the diameter and the depth of the cone 133 are 500 μm or less. The vertex in the cross section may have an R shape. The light that has been guided to the first light emitting unit bottom surface 123 changes its traveling direction by being incident on or reflected by the cone 133, and is emitted from the surface (upper surface) facing the first light emitting unit bottom surface 123 to emit light in a planar shape. can do. The conical grooves are provided in the number of several hundred to several thousand on the first light emitting unit bottom surface 123.

  In FIG. 3C, a convex cone 134 is disposed on the bottom surface 123 of the first light emitting unit. The width and height of the cone 134 are both 500 μm or less. The apex portion in the cross section may have an R shape. The light guided to the first light emitting unit 113 changes its traveling direction by being incident or reflected on the cone 134 and is emitted from the surface (upper surface) facing the first light emitting unit bottom surface 123 to emit light in a planar shape. The conical grooves that can be formed are provided in the number of several hundred to several thousand on the bottom surface 123 of the first light emitting unit.

  In this way, the light guided to the first light emitting unit 113 can be emitted and emitted in a planar shape according to the patterns shown in FIGS. At this time, in the patterns of FIGS. 3A to 3C, the depth of the pattern on the entrance side (the bent portion 112 side of FIG. The depth may be increased toward the direction (left side). Alternatively, the entrance side may be provided with a coarse pattern pitch and fine in the internal direction. With such a structure, light can be emitted uniformly.

  In any of the prism shapes shown in the third embodiment, light can be emitted in the light emission direction, but the workability and the ease of control of the light emission direction are the 131 prisms in the first embodiment of FIG. Grooves are most preferred.

(Embodiment 4)
This embodiment relates to the position of the LED 110 in the first embodiment. Other configurations are the same as those of the first embodiment.

  4 (a) and 4 (b) are partial cross-sectional views of the lighting fixture of the present invention. 4A and 4B correspond to FIG. 1A, and the position of the LED 110 is changed.

  In Fig.4 (a), the position of LED110 exists in the collar part 114 side (outside of an instrument) rather than the position in Fig.1 (a). In this positional relationship, the proportion of light going in the main light direction 200 decreases, and the proportion of light going in the sub light guide direction 201 in the collar portion 114 direction increases. Light leaking from the collar portion 114 increases.

  On the other hand, in FIG.4 (b), the position of LED110 exists in the 1st light emission part 113 side compared with the positional relationship in Fig.1 (a). At this time, the ratio of the light guided to the collar portion 114, that is, the light amount in the sub light guide direction 201 is reduced. The light divergence from the collar portion 114 is reduced, and the spread of light is deteriorated.

  As shown in FIG. 1A, FIG. 4A, and FIG. 4B, the direction in which light is guided can be controlled by changing the position of the LED 110 with respect to the light guide plate 111.

  What is necessary is just to determine the position of LED110 and the light-guide plate 111 (bending part 112) according to the kind of LED lighting fixture. If the structure is movable, it can be applied to various purposes. For example, in the case of a small room, the arrangement shown in FIG. The LED 110 may be fixed at an arbitrary position between the bent portion 112 and the collar portion 114 below the light incident region 124. More preferably, the center of the light source of the LED 110 needs to be located between the outer peripheral surface and the inner peripheral surface of the bent portion 112.

(Embodiment 5)
FIGS. 5A and 5B are views showing a partial cross section of the lighting fixture of this embodiment. Except as described below, the other configurations are the same as those in the first embodiment.

  In FIG. 5A, the first light emitting unit bottom surface 123 and the light incident region 124 are on the same plane. Thereby, the light emitted from the LED 110 can efficiently enter the light guide plate 111. However, in this example, since the light guide plate 111 is thick, the quantity is small and the quantity is small, and it is possible to directly process it. Not economical. When improving performance in a small lot, it is effective in increasing the light incident efficiency.

  In FIG. 5 (b), the curved line of the bent portion 112 is not a curve but a single or a plurality of straight lines. That is, it is a plane.

  This is advantageous in that it is easy to create a mold necessary for manufacturing the light guide plate and the mold release property at the time of molding. Further, the bent portion upper surface 112a which is the surface opposite to the LED 110 in the bent portion 112 may not be a mirror surface. In that case, the ratio of total reflection at the bent portion 112 is reduced, and light can be actively emitted also from the bent portion upper surface 112a. From the first light emitting portion 113 to the collar portion 114, the bent portion 112 can be further increased. The light can be emitted continuously.

(Embodiment 6)
Fig.6 (a) is a figure which shows the partial cross section of the lighting fixture in Embodiment 6 of this invention.

  The overall configuration is the same as in the first embodiment. In this embodiment, the bottom surface of the substrate 115 and the end surface 138 of the collar portion 114 are on the same plane.

  In the first embodiment, as shown in FIG. 1B, the bottom surface of the substrate 115 and the bottom surface of the end portion of the collar portion 114 are not in the same plane. For this reason, there is a difference in level between the housing surface of the luminaire arranged at the bottom of the substrate 115 and the bottom of the end of the collar 114. Therefore, it is necessary to separately arrange a member having a function of filling this gap. It was.

  In this embodiment, the distance between the LED 110 and the light incident area 124 of the light guide plate 111 is fixed by fixing the back surface of the substrate 115 and the end surface 138 of the collar portion 114 on the same surface to a housing, a ceiling, or the like. It can be made constant, easy to attach, and can maintain a stable positional relationship.

  FIG.6 (b) is a figure which shows the partial cross section of another lighting fixture in this embodiment. The overall configuration is the same as in the first embodiment. In this embodiment, a curved surface 136 having a smooth curve is formed on the upper surface of the collar portion 114. The shape of the curved surface 136 is a smooth curve from the base portion with the bent portion 112. In this case, light can be emitted radially from the curved surface 136 which is the upper surface of the collar portion 114. This makes it possible to emit light with a wider spread. The curved portion has an arc-shaped cross section.

(Embodiment 7)
The shape of the collar part 114 is demonstrated using FIG. 7 (a)-FIG.7 (c) which are sectional drawings of the edge part of the LED lighting fixture corresponding to FIG.1 (b).

  When the ratio L / T of the length L to the thickness T of the collar portion 114 is small as shown in the cross-sectional view shown in FIG. 7A, light enters the LED 110 and then enters the collar portion 114. By directly emitting light from the collar upper surface 114a facing the surface on the LED 110 side, the entire upper surface of the collar 114 can emit light (arrow).

  On the other hand, when L / T is large as shown in FIG. 7 (b), after entering from the LED 110, the light is emitted directly from the top surface 114a of the collar portion facing the LED 110 side surface of the collar portion 114. The region near the LED 110 of the collar portion 114 emits light, but the region 126 far from the LED 110 cannot emit light because it does not guide the inside of the collar portion 114.

  As shown in the sectional view of FIG. 7C, a single prism groove 117 is disposed in the light incident region 124.

  The cross-sectional shape is a triangle. The depth of the groove is 1.5 mm with respect to the thickness of 3 mm of the collar portion 114, the angle on the side of the triangular collar portion 114 is larger than 70 °, and the angle on the side of the first light emitting portion 113 of the triangle is The setting is larger than 35 °. By making the angle on the flange 114 side larger than the angle on the first light emitting unit 113 side, light is guided more deeply on the flange 114 side.

  In particular, the light incident on the slope 118 side of the prism groove 117 is refracted so that the incident direction is directed to the length direction side of the collar portion 114, and the collar portion upper surface 114 a (second light emitting portion) of the collar portion 114 and The inside of the collar portion 114 can be guided by being totally reflected on the collar portion lower surface 114b. By setting the angle of the bottom side of the prism groove 117 as described above, the rate at which the light incident from the light incident region 124 directly escapes from the collar upper surface 114a (second light emitting part) is reduced. It is possible to increase the ratio of light guiding to the 114 end.

  However, since the thickness of the connecting portion 114c of the collar portion 114 becomes thin and may cause a problem in strength, the connecting portion 114c is provided. The connecting portion 114c is a portion that connects the flange portion 114 and the bent portion 112, and is thicker than the other portions (the flange portion 114 and the bent portion 112). It has more discontinuous thickness than other parts. The flange lower surface 114b on the bottom surface of the flange 114 has an optical surface. The overall configuration is the same as in the first embodiment.

(Embodiment 8)
FIG. 8 (a) is a diagram showing a partial cross section of a lighting fixture according to Embodiment 8 of the present invention.

  The connecting portion 114 c is a thick portion that connects the flange portion 114 and the bent portion 112. The collar portion lower surface 114b has an optical surface. Other configurations are the same as those of the first embodiment.

  As shown in FIG. 8A, a plurality of fine grooves 128 are arranged in the light incident region 124. The other configuration of FIG. 8A is the same as that of FIG. The depth of the groove 128 is 0.2 mm with respect to the thickness of 3 mm of the collar portion 114, and the angle of the base is the same as that of the prism groove 117 in the seventh embodiment. Ten prism grooves are arranged this time. In this case, the strength can be maintained by the thickness of the connecting portion 114c of the collar portion 114 while maintaining the function of guiding light into the collar portion 114 as in FIG.

  Further, in order to efficiently emit the light guided to the collar portion 114 to the light emitting surface side (upper surface), it is best to provide the prism groove 131 as shown in FIG. Or you may provide various shape unevenness | corrugations like Fig.3 (a) to FIG.3 (c).

  FIG. 8B shows another example. A texture 119 is arranged in the light incident area 124. Other configurations are the same as those in the first embodiment. While the shape of the groove 128 in FIG. 8A is controlled (line shape), the texture 119 in FIG. 8B is characterized by a random shape. Both the size and depth of the embossment 119 are several μm to several hundred μm in diameter. In this case, since light enters the collar portion 114 in a random direction, light can be guided to the collar portion 114 stochastically.

  The embossed 119 has a mountain-shaped wavy uneven shape, and the peak at the high position of the mountain is random and the shape is not uniform.

(Embodiment 9)
9 (a) to 9 (d) are views showing a partial cross section of the lighting fixture in the ninth embodiment of the present invention. Except as described below, the second embodiment is the same as the first embodiment.

  The collar part 114 has a collar part upper surface 114a (second light emitting part) that is a light diffusing surface on the upper surface, and a collar part lower surface 114b that is a lower surface. The connecting portion 114 c is a thick portion that connects the flange portion 114 and the bent portion 112. In this example, various shapes, that is, unevenness, prism grooves, and the like are provided on the collar upper surface 114a. These are provided in the same circumference as the arrangement of the LEDs 110. Other configurations are the same as those of the first embodiment.

  In FIG. 9A, a single prism groove 310 is arranged on the flange upper surface 114a side. The depth of the groove is 1.5 mm with respect to the thickness of the flange portion 114 of 3 mm. The prism groove 310 has a triangular shape in cross section, but the base angle is set so that the angle on the flange 114 side is smaller than 35 ° and the angle on the first light emitting unit 113 side is smaller than 70 °. As a result, the light is guided more toward the flange 114 side.

  FIG. 9B is a diagram showing a partial cross section of another modification. A plurality of prism grooves 311 are provided on the collar upper surface 114 a in the same circumferential shape as the LED 110 array. The overall configuration is the same as in the first embodiment. In the cross-sectional view shown in FIG. 9B, a plurality of fine prism grooves 311 are arranged on the flange portion upper surface 114a side. The depth of the groove is 0.2 mm with respect to the thickness of the collar 114, and the angle of the base is the same as that of the prism groove 310 shown in FIG. This time, ten prism grooves 311 are arranged. Furthermore, by increasing the thickness of the base portion 114 c of the collar portion 114, the strength of the base portion 114 c can be maintained while maintaining the function of guiding light into the collar portion 114.

  FIG. 9C is a diagram showing a partial cross section of another modification. A texture 312 is provided on the collar upper surface 114a. The overall configuration is the same as in the first embodiment. Other configurations are the same as those in FIG. The shape, size, and the like of the texture 312 are the same as those of the texture 119 of the eighth embodiment. Incident light from the light incident area 124 hits a texture pattern and diffuses light in the light guide direction. In this configuration, since the effect of the embossed pattern does not change depending on the positional relationship with the light source, the allowable dimension of assembly accuracy can be increased.

  In FIG.9 (d), the hollow 313 is provided in the collar part upper surface 114a. Other configurations are the same as those of the first embodiment. In this example, the light that has entered the collar 114 is once totally reflected by the depression 313, so that it can be easily guided to the end of the collar 114. That is, the light is totally reflected internally in the shape of the depression 313.

(Embodiment 10)
10A and 10B are perspective views of the light guide plate 111 according to the tenth embodiment. In FIG. 1A, the light guide plate 111 has a disc shape, but in this embodiment, has a rectangular parallelepiped shape.

  FIG. 10A is a perspective view of the light guide plate 111. The light guide plate 111 has two planar collar portions 114, two bent portions 112 are positioned between the two collar portions 114, and one planar shape is further interposed between the two bent portions 112. The first light emitting unit 113 is included.

  FIG.10 (b) is the elements on larger scale of the edge part at the time of introduce | transducing this light-guide plate 111 to a lighting fixture. This corresponds to FIG. The LED 110 is disposed below the collar portion 114. By constituting with a quadrangle, it is possible to provide a lighting device that emits light entirely without an outer frame covering. Furthermore, since there are not four sides, it is not necessary to consider the distortion caused by fixing the four sides, and the positional relationship between the LED 110 and the light guide plate 111 can be fixed without difficulty.

(Embodiment 11)
Sectional drawing of the edge part of the lighting fixture using the light-guide plate 111 of this invention is shown to Fig.11 (a)-(d). 11A to 11D, the same components as those in FIG. 1A are denoted by the same reference numerals, and description thereof is omitted.

  The light guide plate 111, the cover 220, and the housing 221 are configured. Other configurations are the same as those in FIG.

  FIG. 11A shows an LED lighting apparatus in which any of the light guide plate 111, the LED 110, and the substrate 115 described above is surrounded by a cover 220 and a housing 221. The housing 221 has a planar shape, and the cover 220 covers the light guide plate 111 in a large shape.

  In FIG. 11 (b), the shape of the cover 220 and the housing 221 is different from that of FIG. 11 (a), and takes the shape according to the design and specifications of the lighting fixture.

  If the cover 220 is a cover that diffuses and transmits light, the cover 220 is disposed above the light guide plate 111 as shown in FIGS. 11 (a) and 11 (b). The first light emitting portion 113 and the collar portion 114 of the light guide plate 111 appear to emit light continuously, which is preferable as a lighting fixture.

  As shown in FIG. 11C and FIG. 11D, by arranging a light diffusing sheet 222 having diffuse transmission near the upper part of the light guide plate 111, the first light emitting part and the collar part are continuous and more. By appearing to emit light in a state where unevenness is reduced, it is more preferable as a lighting fixture.

  As the light diffusing sheet 222 having diffuse transmittance, a diffusion film that is made of a plastic and is flexible and has both high light transmittance and diffusibility can be used. A diffusion film having both high light transmittance and diffusibility can be used. It can adhere to the light guide plate 111.

  Note that Embodiments 1 to 11 described above can be combined with each other with respect to elements that are not inhibited.

It can also be used for light-emitting components used in various lighting devices and signboards.

107 Emission direction 108 Light guide direction 110 LED
111 Light guide plate 112 Bent part 113 First light emitting part 114 Collar part 114a Collar part upper surface 114b Collar part lower surface 115 Substrate 116 Fixing part 117 Prism groove 118 Slope 119 Embossing part 122 Total reflection area 123 First light emitting part bottom face 124 Incident light Area 125 Near area 128 Groove 126 Distant area 131 Prism groove 132 Triangular prism groove 133 Cone 134 Cone 136 Curved surface 138 End end face 142 Total reflection area 201 Sub light guide direction 221 Housing 220 Cover 222 Light diffusion sheet 310 Prism groove 311 Prism Groove 312

Claims (14)

Including an LED light source and a light guide plate,
The light guide plate is
A light incident part that takes light from the LED light source into the light guide plate;
A bending part that bends the path of light taken from the light incident part;
A first light emitting part for emitting light that has passed through the bent part;
A collar portion having a second light emitting portion that emits light and is positioned in the opposite direction to the bent portion with the light incident portion therebetween.
An LED lighting device comprising: The LED lighting device according to claim 1, wherein irregularities, grooves, or dots are formed on a surface facing the emission surface of the first light emitting unit. The collar portion and the first light emitting portion have a planar shape and are parallel to each other,
2. The LED lighting device according to claim 1, wherein the bent portion connects the collar portion and the first light emitting portion, and a cross-sectional shape thereof is an arc shape. The LED lighting device according to any one of claims 1 to 3, wherein a fixing portion that fixes the light guide plate is provided at an end portion of the collar portion. The light guide plate has two planar flange portions, two bent portions are positioned between the two flange portions, and one planar first light emission is between the two bent portions. The LED lighting device according to claim 1, wherein the LED lighting device is provided with a portion. The LED illumination according to any one of claims 1 to 5, wherein an LED light source is located below the bent portion, and a center of the LED light source is located between an outer peripheral surface and an inner peripheral surface of the bent portion. apparatus. The LED lighting device according to any one of claims 1 to 6, wherein an LED light source can be fixed at an arbitrary position between the first light emitting unit and the collar portion below the bent portion. The LED lighting device according to any one of claims 1 to 7, wherein a lower surface of the collar portion and a lower surface of the first light emitting portion are coplanar. The end of the collar part has a convex part, the LED light source is below the collar part, and the front end surface of the convex part and the lower surface of the substrate having the LED light source are coplanar. The LED lighting device according to any one of the above. The LED lighting device according to claim 1, wherein a surface of the second light emitting portion of the collar portion is curved. The LED lighting device according to claim 1, wherein the bent portion is planar. The unevenness, the groove | channel, the dot, the inclination part, or the embossing is formed in the said 2nd light emission part of the said collar part, The any one of Claim 1 to 11 characterized by the above-mentioned. LED lighting device. The unevenness, the groove | channel, the dot, the inclination part, or the embossing is formed in the surface facing the output surface of the said collar part, The any one of Claim 1 to 12 characterized by the above-mentioned. LED lighting apparatus of description. The LED illumination device according to any one of claims 1 to 13, wherein a groove or a texture is formed in the light incident portion.

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