JP2012119226A - Light guide rod, and lighting device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light guide rod capable of attaining uniform emission light with a wide angle by using the single light guide rod, and to provide a lighting device using the light guide rod.SOLUTION: In the light guide rod 10 formed in an approximately hexagonal prism shape, six side faces of an approximately hexagonal prism respectively are a primary light emitting surface 11, two secondary light emitting surfaces 12 located on both adjoining sides of the primary light emitting surface, a primary reflecting surface 13 located at an opposite side of the primary light emitting surface, and two secondary reflecting surfaces 14 located on both adjoining sides of the primary reflecting surface. The primary light emitting surface 11 is a smooth surface, the secondary light emitting surfaces 12 are arc surfaces curved in an externally convex shape, primary reflecting grooves 15 are arranged on the primary light emitting surface 13, and secondary reflecting grooves 16 are arranged on the secondary reflecting surfaces 14. The length of the primary reflecting groove 15 is shorter than the length of the secondary reflecting groove 16, and the depth of the primary reflecting groove 15 is shallower than the depth of the secondary reflecting groove 16.

Description

  The present invention relates to a light guide rod using light refraction and reflection, and an illumination device using the same.

  The conventional light guide bar and the illumination device using the same have a narrow angle of light output per light guide bar. In order to compensate for this, a technique for rotating or moving the light guide bar, a technique for arranging many light guide bars side by side, and the like are known (see, for example, Patent Document 1). However, there is a problem that the number of components increases and the occupied area also increases.

JP 2002-355374 A

It is an object of the present invention to provide a light guide bar that can obtain uniform light output at a wide angle with a single light guide and an illumination device using the same.
Another object of the present invention is to provide a light guide bar having a simple structure and a small occupation area, and a lighting device using the same.
Another object of the present invention is to provide a light guide rod capable of increasing the straightness of light and increasing the amount of light, and an illumination device using the same.

  In the present invention, the light guide rod has a substantially hexagonal prism shape, and the light exit surface has an arc surface convexly curved outward and a smooth surface sandwiched between the arc surfaces, and a groove for supplying light to the arc surface is provided. It is based on the knowledge that uniform light emission can be obtained at a wide angle by making the groove long and deep and the groove for supplying light to the smooth surface short and shallow. In addition, the light output from the end of the arc surface is based on the knowledge that light shortage can be compensated by superimposing light. At least one of the above problems is solved by the following light guide rod and a lighting device using the same.

In this specification, the main light exit surface is one of the six side surfaces of the substantially hexagonal columnar light guide rod, and means a surface that faces the light output surface.
In the present specification, the sub-light exit surface is two of the six side surfaces of the substantially hexagonal columnar light guide rod, and means a surface located on both sides of the main light exit surface.
In this specification, the main reflection surface is one of the six side surfaces of the substantially hexagonal columnar light guide rod, and means a surface located opposite to the main light exit surface.
In this specification, the sub-reflection surface means two of the six side surfaces of the substantially hexagonal columnar light guide rod, and means a surface located on both sides of the main reflection surface.

In this specification, the smooth surface means a surface having a surface roughness (Rmax) of less than 0.5 μm.
In this specification, the circular arc surface means a convex curved surface formed by an arc extending along a predetermined direction.
In the present specification, the end face means a substantially hexagonal face present at the end of the light guide rod.
In this specification, the reflecting plate means a plate that reflects light and contributes to determining the direction of light emitted from the light guide rod.
In this specification, the reflection groove means a groove that reflects light and contributes to determining the direction of light emitted from the light guide rod.
In the present specification, the length of the reflection groove means the length of the bottom surface of the reflection groove.

One side surface of the present invention has a substantially hexagonal prism shape, and the six side surfaces of the substantially hexagonal column are respectively a main light exit surface, two sub light exit surfaces located on both sides of the main light exit surface, and a main light exit surface. It is a light guide rod which is a main reflection surface located opposite to each other and two sub-reflection surfaces located on both sides of the main reflection surface. The main light exit surface is a smooth surface, and the secondary light exit surface is an arc surface that is curved outwardly. A main reflection groove is provided on the main reflection surface in a direction orthogonal to the longitudinal direction of the light guide rod, and a sub reflection groove is provided on the sub reflection surface in a direction orthogonal to the longitudinal direction of the light guide rod. The length of the main reflection groove is shorter than the length of the sub reflection groove, and the depth of the main reflection groove is a light guide rod shallower than the depth of the sub reflection groove.
As described above, there has been known an illuminating device that emits light at a wide angle by arranging many light guide bars side by side or moving the light guide bars. However, an illumination device that emits light at a wide angle with a single light guide rod has not been obtained. The present inventor uses a light guide rod having a substantially hexagonal columnar shape, makes the light exit surface a smooth surface and a circular arc surface, and provides a difference in the length and depth of the groove for supplying light to each of them, so that it is uniform over a wide angle. An illuminating device capable of obtaining light emission has been realized.
A preferred embodiment of the present invention is the light guide rod as described above, wherein the main reflection surface is a surface curved concavely inward.
A preferred embodiment of the present invention is the light guide rod as described above, wherein a length of the main light emitting surface width which is a width of the main light emitting surface is shorter than a length of the main reflecting surface width which is a width of the main reflecting surface.
The preferable aspect of this invention is an illuminating device which has the light guide bar in any one of said, and the light source arrange | positioned at the end surface of the light guide bar.
The preferable aspect of this invention is an illuminating device as described above in which the reflecting plate is arrange | positioned adjacent to the main reflective surface and the subreflective surface.
The preferable aspect of this invention is an illuminating device as described above in which a reflecting plate has the concave surface comprised by either a curved surface or many surfaces.
The preferable aspect of this invention is an illuminating device as described above in which the reflecting plate has covered six side surfaces of the light guide bar in the vicinity of the end surface of the light guide bar.

  Another aspect of the present invention relates to a light guide rod 10 having a main light exit surface, a main reflection surface located opposite to the main exit surface, and two sub-reflection surfaces 14 located on both sides of the main reflection surface. The main light exit surface 11 is an arc surface that is connected to the two sub-reflection surfaces and curved outwardly in a convex shape. A main reflection groove 15 is provided on the main reflection surface 13 in a direction perpendicular to the longitudinal direction of the light guide rod. A sub-reflection groove 16 is provided on the sub-reflection surface 14 in a direction orthogonal to the longitudinal direction of the light guide rod. The length of the main reflection groove 15 is shorter than the length of the sub reflection groove 16, and the depth of the main reflection groove 15 is shallower than the depth of the sub reflection groove 16.

According to the present invention, uniform light emission can be obtained at a wide angle with a single surface by providing a light exit surface as a smooth surface and a circular arc surface and providing a difference in the length and depth of the groove for supplying light to each surface. Can be provided, and a lighting device using the same.
According to the present invention, it is not necessary to arrange a large number of light guide rods or move the light guide rods, and to provide a light guide rod having a simple structure and a small occupation area, and an illumination device using the same. it can.
ADVANTAGE OF THE INVENTION According to this invention, the light guide rod which can increase the light linearity and can increase light quantity by covering the vicinity of the end surface vicinity of a light guide rod with a reflecting plate, and an illuminating device using the same can be provided.

FIG. 1A is a perspective view of the light guide bar of the present invention, and FIG. 1B is an enlarged front view of the light guide bar of the present invention. FIG. 2 is a three-side view of the light guide bar of the present invention. FIG. 3 is a three-side view of the illumination device of the present invention. FIG. 4 is a perspective view of the illumination device of the present invention. 5 is a cross-sectional view taken along line AA in FIG. 6 is a cross-sectional view taken along line BB in FIG. 7A is a cross-sectional view taken along the line AA in FIG. 3 showing the light output angle to the light output surface, FIG. 7B is an enlarged view of the light guide rod explaining the light L2, and FIG. FIG. 8 is a partially enlarged view of FIG. 7A illustrating L3. FIG. 8 is a diagram for explaining another embodiment of the present invention.

Light guide bar The light guide bar of the present invention will be described with reference to FIGS. 1 and 2.
FIG. 1A is a perspective view of the light guide bar of the present invention, and FIG. 1B is an enlarged front view of the light guide bar of the present invention. FIG. 2 is a three-side view of the light guide bar of the present invention. In the figure, reference numeral 10 denotes a light guide rod of the present invention, reference numeral 11 denotes a main light exit surface, reference numeral 12 denotes two auxiliary light exit surfaces located on both sides of the main light exit surface, and reference numeral 13 denotes a main reflection surface located on the opposite side of the main light exit surface. , 14 is two sub-reflecting surfaces located on both sides of the main reflecting surface, d1 is the length of the light guide bar, e1 is the width of the light guide bar, e2 is the height of the light guide bar, e3 is the length of the arc Symbol e4 is the angle of the sub-reflecting surface, symbol e5 is the main light exit surface width, and symbol e6 is the main reflecting surface width.
As shown in FIG. 1, the shape of the light guide bar 10 is substantially hexagonal. Here, “substantially hexagonal columnar shape” means that a substantially hexagonal shape has a thickness, and a rectangular shape or a three-dimensional shape in which an arc surface is erected between two substantially hexagonal shapes. The substantially hexagonal shape means a planar figure surrounded by sides and arcs, and the number of sides and arcs is six.
In addition, two substantially hexagons corresponding to a substantially hexagonal columnar roof and a bottom are referred to as end faces, and the surrounding six quadrangular or arcuate faces are referred to as side faces.
In addition, six side surfaces are positioned on both sides of the main light emitting surface 11, the two sub light emitting surfaces 12 located on both sides of the main light emitting surface, the main reflecting surface 13 located on the opposite side of the main light emitting surface, and the main reflecting surface. Two sub-reflecting surfaces 14.
The light guide rod 10 has a substantially hexagonal prism shape, so that the six sides of the substantially hexagonal prism are divided into three continuous surfaces that reflect light and three continuous surfaces that emit light, and are different from each other. Adjustments can be made. In addition, the hexagonal column shape is easier to handle because it is less likely to roll than the cylindrical shape and easier to grip than the quadrangular column shape.

Also, the main light exit surface 11 is a smooth surface, and the secondary light exit surface 12 is an arcuate surface that is curved outward.
Thereby, the emitted light can be divided into light emitted from the main light exit surface 11 and light emitted from the sub light exit surface 12. And since the light quantity from the main light emission surface 11 and the light quantity from the sub light emission surface 12 can be adjusted separately, it becomes easy to adjust so that uniform light emission may be performed as a whole. Further, the light exiting from the secondary light exit surface 12 is diffused by refraction, so that a wide angle light exit is possible, and the light exit angle can be adjusted by adjusting the diameter and shape of the arc surface. The main reflecting surface 13 may be a surface curved in a concave shape inward. Thereby, the amount of light can be controlled by adjusting the shape of the concave surface. Moreover, the light guide bar can be formed into a substantially heptagonal columnar shape by forming the concave surface with two surfaces. Further, by forming the concave surface with a large number of surfaces, it is possible to form a substantially octagonal prism shape or a substantially nine-sided prism shape.

Further, a main reflection groove 15 is provided on the main reflection surface 13 in a direction orthogonal to the longitudinal direction of the light guide rod 10, and a sub reflection groove 16 is provided on the sub reflection surface 14 in an orientation orthogonal to the longitudinal direction of the light guide rod 10. It has been.
As shown in FIG. 2, the main reflection grooves are arranged on three continuous surfaces that reflect light, that is, the main reflection surface 13 and the sub-reflection surface 14 in a direction orthogonal to the longitudinal direction of the light guide rod 10. 15 is continuously provided, and the sub-reflection groove 16 is continuously provided on the sub-reflection surface 14 in a direction orthogonal to the longitudinal direction of the light guide rod 10. The main reflection groove 15 and the sub reflection groove 16 are observed as a series of grooves when observed from the side surface of the light guide rod. Thereby, the light from the light source is emitted in a continuous state. As a result, the light can be emitted with less unevenness in the amount of light.

Further, the length of the main reflection groove 15 is shorter than the length of the sub reflection groove 16. The length of the main reflection groove 15 is preferably 0.5 to 0.9 times the length of the sub reflection groove 16.
Further, the depth of the main reflection groove 15 is shallower than the depth of the sub reflection groove 16. The depth of the main reflection groove 15 is preferably 0.1 to 0.9 times the depth of the sub reflection groove 16.
Since the light emitted from the main light exit surface 11 is not diffused, the amount of light tends to be larger than the diffused light emitted from the sub light exit surface 12. Therefore, in order to emit light uniformly, it is necessary to reduce the light amount from the main light exit surface 11 to match the light amount from the sub light exit surface 12.
The length of the main reflection groove 15 is 0.5 to 0.9 times the length of the sub reflection groove 16. If it is less than 0.5 times, the light amount from the main light exit surface 11 may be insufficient compared to the light amount from the sub light exit surface 12, and if it exceeds 0.9 times, the light amount from the sub light exit surface 12 may be smaller. This is because the amount of light from the main light exit surface 11 may become excessive. The length of the main reflection groove 15 is preferably 1/3 or more and 2/3 or less of the main reflection surface width e6.
The sub-reflection groove 16 is preferably provided over the short side of the sub-reflection surface 14. That is, it is preferable to provide the sub-reflection groove 16 so that the side surface of the sub-reflection groove 16 appears on the main reflection surface 13 and the sub light exit surface 12. This is because the amount of light from the secondary light exit surface 12 is increased as much as possible to reduce the difference from the amount of light from the main light exit surface 11.

The depth of the main reflection groove 15 is not less than 0.1 times and not more than 0.9 times the depth of the sub reflection groove 16. If it is less than 0.1 times, the light amount from the main light exit surface 11 may be insufficient compared to the light amount from the sub light exit surface 12, and if it exceeds 0.9 times, the light amount from the sub light exit surface 12 may be smaller. This is because the amount of light from the main light exit surface 11 may become excessive. The depth of the main reflection groove 15 and the sub reflection groove 16 is preferably 0.2 times or less of the light guide rod height e2. This is because if the depth of the main reflection groove 15 and the sub reflection groove 16 exceeds 0.2 times the light guide bar height e2, the strength of the light guide bar 10 may be impaired.
The bottom surface of the main reflection groove 15 may be a flat surface or a curved surface protruding toward the main light exit surface 11 side. The bottom surface of the sub-reflection groove 16 may also be a flat surface or a curved surface protruding toward the sub-light exit surface 12 side. When using a long light guide rod, it is preferable to make the bottom surface of the reflection groove flat. This is because making the bottom surface of the reflection groove flat can facilitate the forming operation.

  The bottom surface of the reflection groove is preferably subjected to specular reflection treatment. A known method can be employed for the specular reflection treatment. By performing such a specular reflection process, light can be reflected without waste by the reflection grooves.

  The light guide rod 10 is preferably uniform in thickness over its entire length. This is because the uniform light emission in the longitudinal direction can be achieved because the thickness is uniform over the entire length. In addition, when using a reflection plate described later, it is possible to obtain an advantage that the light guide rod can be easily attached and detached by providing a uniform groove in the longitudinal direction of the reflection plate.

  The size of the light guide bar 10 can be determined in consideration of the required light output range, light amount, and the like. The light guide rod length d1 is preferably 10 mm or more and 1000 mm or less, although it depends on the light intensity of the light source. The light guide bar width e1 is preferably 10 mm or more and 200 mm or less, the light guide bar height e2 is preferably 10 mm or more and 200 mm or less, the arc length e3 is 5 mm or more and 200 mm or less, and the angle e4 of the sub-reflection surface is 20 ° or more and 80 °. Hereinafter, the main light exit surface width e5 is preferably 5 mm or more and 100 mm or less, and the main reflection surface width e6 is preferably 5 mm or more and 150 mm or less. More specifically, the light guide rod length d1 is 200 mm to 800 mm, the light guide rod width e1 is 20 mm to 40 mm, the light guide rod height e2 is 20 mm to 40 mm, and the arc length e3 is 10 mm to 30 mm. Hereinafter, when the angle e4 of the sub-reflecting surface is 45 ° to 75 °, the main light emitting surface width e5 is 10 mm to 20 mm, and the main reflecting surface width e6 is 10 mm to 30 mm, it is easy to handle for a lighting device. is there. The light guide bar can be formed by molding or cutting. If the angle e4 of the sub-reflecting surface is narrowed, the light emission angle is narrowed and the amount of light is increased. Further, if the angle e4 of the sub-reflecting surface is increased, the light emission angle is increased and the amount of light is reduced. Thus, by adjusting the angle e4 of the sub-reflection surface, the light emission angle and the light amount are adjusted.

The length of the main light exit surface width e5 is preferably shorter than the length of the main reflection surface width e6. The length of the main light exit surface width e5 is preferably 0.5 to 0.9 times the length of the main reflection surface width e6. Thereby, a part of the light from the main reflecting surface 13 can be emitted from the sub-light emitting surface 12. If it is less than 0.5 times, the light quantity from the main light exit surface 11 may be insufficient, and if it is 0.9 times or more, the light quantity from the sub light exit surface 12 may be insufficient.
The light emitted from the sub-light-emitting surface 12 has the largest amount of light from the center of the arc surface because the sub-light-emitting surface 12 is an arc surface, and is diffused by the arc surface as the end of the arc surface is reduced. By emitting a part of the light from the main reflecting surface 13 from the auxiliary light emitting surface 12, it is possible to make up for the shortage of the light emitted from the end of the auxiliary light emitting surface 12 from the main light emitting surface 11.

The end surface of the light guide rod 10 becomes an incident portion where light enters by facing a light source described later. The incident portion is usually a smooth surface, but may be a convex surface or a concave surface. If the incident part is concave, the light source can be covered, and the incident efficiency can be increased.
The material of the light guide rod 10 of the present invention is not particularly limited as long as it is a light transmissive material. For example, synthetic resin such as acrylic resin, polycarbonate resin, polyethylene terephthalate, silicone resin, epoxy resin, or inorganic material such as glass is used. Can be mentioned. Among them, acrylic resin is preferable because it has a high light guiding effect and is easy to mold and handle. Further, the light guide rod may be formed by combining a plurality of materials.

  The light guide bar 10 may be a colored one as well as a colorless and transparent one. Further, a color conversion layer may be provided on the main light exit surface 11 and the sub light exit surface 12. Further, a color conversion layer may be provided on a part of the main light exit surface 11 and the sub light exit surface 12 instead of the entirety. By these methods, it is possible to emit light having a color different from the original color of the light source. The color conversion layer can be formed, for example, by applying a colored translucent ink, applying a colored translucent film, or forming a colored translucent resin layer.

Light source The type of light source used in the present invention is not particularly limited, but is preferably an LED. This is because LEDs have the advantages of being small, resistant to vibration and impact, and having a narrow viewing angle. The type of LED is not particularly limited, and various types such as a shell type and a SMD (Surface Mount Device) type can be adopted. The color of the LED is not particularly limited, and an LED having a desired color such as white, blue, red, or green can be used. A plurality of LEDs may be used.

Illumination Device The illumination device will be described with reference to FIGS.
3 is a three-side view of the lighting device of the present invention, FIG. 4 is a perspective view of the lighting device of the present invention, FIG. 5 is a cross-sectional view taken along line AA in FIG. 3, and FIG. FIG. 7A is a cross-sectional view taken along the line AA in FIG. 3 showing the light output angle to the light output surface, and FIG. 7B is an enlarged view of the light guide rod for explaining the light L2. c) is a partially enlarged view of (a) illustrating the light L3. In the figure, reference numeral 20 denotes a light source such as an LED, reference numeral 21 denotes a light source substrate such as an LED substrate, reference numeral 30 denotes a reflecting plate, reference numeral 31 denotes a concave surface, reference numeral 40 denotes an emitted light surface, reference numeral a1 denotes a light emission length, and reference numeral a2 denotes a reflecting plate. Length, symbol b1 is the reflector width, symbol c1 is the reflector height, symbol f1 is the light exit angle, symbol L1 is the light from the main light exit surface 11, and symbol L2 is the end of the secondary light exit surface 12 from the main light exit surface 11. , L3 is light from the end of the sub-light-emitting surface 12 from the sub-reflecting surface 14.
The illuminating device of the present invention includes a light guide bar 10 and a light source 20 disposed on an end surface of the light guide bar.
The light source 20 may be disposed on one end surface of the light guide bar 10 or on both end surfaces, but is preferably disposed on both end surfaces in order to obtain a sufficient amount of light. When arranged on both end faces, the one light source and the other light source may be the same type of light source or different types of light sources.
The light from the light source 20 enters from the incident portion which is the end face of the light guide rod 10, is reflected by the main reflection groove 15 and the sub reflection groove 16, and is emitted from the main light exit surface 11 and the sub light exit surface 12.

  In the illuminating device of the present invention, the reflecting plate 30 may be disposed adjacent to the main reflecting surface 13 and the sub-reflecting surface 14. When the reflecting plate 30 is disposed, the light to be emitted from the main reflecting surface 13 and the sub-reflecting surface 14 is reflected to be emitted from the main emitting surface 11 and the auxiliary emitting surface 12, and the main emitting surface 11 and the auxiliary emitting surface 11 are reflected. There is an advantage that the amount of light from the light exit surface 12 can be increased. However, the cost of the reflector 30 is increased, and the lighting device becomes large. When the reflecting plate 30 is not disposed, there are advantages such that the cost of the reflecting plate can be reduced, the entire lighting device can be made smaller, and the degree of freedom of attachment can be increased. However, the amount of light is reduced as compared with the case where the reflecting plate 30 is disposed.

  As shown in FIG. 3, it is preferable to use a reflector 30 that is somewhat larger than the light guide rod 10. The light output length a1 is 0.8 to 1 times the light guide rod length d1, the reflector length a2 is 1 to 1.2 times the light guide rod length d1, and the reflector width b1 is the light guide. The rod width e1 is preferably 2 to 10 times, and the reflector height c1 is preferably 1 to 5 times the light guide rod height e2. By covering the main reflection surface 13 and the sub reflection surface 14, the amount of light from the main output surface 11 and the sub output surface 12 can be increased.

  As shown in FIGS. 4 and 5, the reflecting plate 30 covers the main reflecting surface 13 and the sub-reflecting surface 14, and increases in height with increasing distance from the light guide rod 10, with the light guide rod 10 at the center. A symmetrical concave surface 31 is preferably formed. The concave surface 31 is preferably composed of either a curved surface or multiple surfaces. By having the concave surface 31 composed of a curved surface or multiple surfaces, the light output from the end of the sub-light-emitting surface 12 from the sub-reflecting surface 14 can be compensated for by overlapping the light from the reflecting plate 30. Moreover, by having the concave surface 31, the light emission angle can be precisely adjusted, and the amount of light can be concentrated in a desired range.

  As shown in FIGS. 5 and 6, the reflecting plate 30 preferably covers all six side surfaces of the light guide bar 10 in the vicinity of the end face of the light guide bar 10. Thereby, the straightness of the light in the light guide rod 10 can be improved, and the amount of light emitted from the main light exit surface 11 and the sub light exit surface 12 can be increased. Further, light that does not pass through the light guide rod 10 is not leaked from the light source 20, and uniform light output is easily obtained.

As shown in FIG. 7A, according to the illumination device of the present invention, uniform light emission can be obtained on the light output surface 40 for a desired light output angle f1.
The amount of light L1 from the main light exit surface 11 is reduced by shortening the length of the main reflection groove 15 or decreasing the depth.
As shown in FIG. 7B, the light L2 from the end of the secondary light exiting surface 12 from the main light exiting surface 11 is combined with the light from the main reflective surface 13 and the light from the secondary reflective surface 14, thereby reducing the amount of light. There are many.
As shown in FIG. 7C, the light L3 from the end of the auxiliary light exiting surface 12 from the auxiliary reflecting surface 14 increases the amount of light by combining the light from the secondary exiting surface 12 and the light from the reflecting plate 30. is doing.
As described above, the amount of light can be adjusted to obtain uniform light output on the light output surface 40.

  Further, another embodiment of the present invention will be described with reference to FIG. In addition, description is abbreviate | omitted about the location same as embodiment mentioned above, and the location different from embodiment mentioned above is mainly demonstrated. FIG. 8 is a cross-sectional view of a light guide bar according to another embodiment of the present invention.

  As shown in FIG. 8, the cross section of the main light exit surface 11 of the light guide bar 10 is a substantially semicircular shape, and is a circular arc surface that is curved outwardly. The main light exit surface 11 is connected to the two sub reflection surfaces 14 provided with the sub reflection grooves 16. That is, unlike the embodiment described above, the cross section of the light guide bar is not substantially hexagonal.

  Each sub-reflecting surface 14 is located on both sides in the lateral direction of the main reflecting surface 13 located on the opposite side of the main light-emitting surface 11 in the same manner as described above. Similarly to the above-described embodiment, the sub-reflection grooves 16 are formed on the sub-reflection surfaces 14, and the main reflection grooves 15 are formed on the main reflection surface 13.

  Here, the angle formed by the main reflecting surface 13 and the sub-reflecting surface 14 is preferably 5 ° or more and 20 ° or less. In particular, the angle formed by the main reflection surface 13 and the sub-reflection surface 14 is preferably 8 ° or more and 12 ° or less. In another embodiment of the present invention, the angle formed by the main reflecting surface 13 and the sub-reflecting surface 14 is kept wide, so the light angle is also widened.

  Thus, in other embodiment of this invention, since the main light emission surface 14 is ensured widely, uniform light emission can be carried out as the whole light-guide rod. Further, by diffusing the light emitted from the auxiliary light exit surface 12 by refraction, it is possible to emit light at a wide angle.

  Hereinafter, the present invention will be described in more detail based on examples.

The illuminating device of Example 1 is the illuminating device shown in FIGS.
The light guide rod 10 used was a colorless and transparent acrylic resin made into a substantially hexagonal prism shape by cutting. Light guide rod length d1 is 340mm, light guide rod width e1 is 8mm, light guide rod height e2 is 6.6mm, arc length e3 is 4.4mm, sub-reflecting surface angle e4 is 60 degrees, light exit surface The width e5 was 6 mm, and the main reflection surface width e6 was 6.4 mm. The main light exit surface 11 is a smooth surface, the sub light exit surface 12 is an arc surface, and the main reflection surface 13 and the sub reflection surface 14 are smooth surfaces. The end surface of the light guide rod 10 was a smooth surface.

  The main reflection grooves 15 were provided every 0.8 mm in a 300 mm range excluding a 20 mm range from both ends of the main reflection surface 13 by cutting. The depth of the main reflection groove 15 was 0.5 mm, and the width of the main reflection groove 15 was 0.1 mm. The bottom surface of the main reflection groove 15 was a flat surface.

  The sub-reflection grooves 16 were provided at intervals of 0.8 mm in a 300 mm range excluding a range of 20 mm from both ends of the sub-reflection surface 14 by cutting. The depth of the sub-reflection groove 16 was 0.45 mm, and the width of the sub-reflection groove 16 was 0.1 mm. The bottom surface of the sub-reflection groove 16 was a flat surface.

The light source 20 was an SMD type white LED. As shown in FIG. 6, the light guide bar 10 was disposed 1 mm away from the end face. The light source 20 was disposed at both ends of the light guide bar 10.
As the reflector 30, a fluorescent lamp reflector was used. The reflector length a2 was 348.8 mm, the reflector width b1 was 49 mm, and the reflector height c1 was 11.3 mm. As shown in FIG. 5, the reflecting plate 30 is disposed adjacent to the main reflecting surface 13 and the sub-reflecting surface 14. The reflection plate 30 has a concave surface 31 in which four aluminum plates are arranged, and the light emission angle f1 is 120 °.
As shown in FIG. 6, the reflecting plate 30 covers all six side surfaces of the light guide bar 10 within a range of 50 mm from the end face of the light guide bar 10.
The lighting device of Example 1 was manufactured as described above.

As shown in FIG. 7A, the light exit surface was disposed at a position 500 mm away from the light guide rod 10.
Seven illuminance meters were arranged at equal intervals within a light emission angle of 120 °, and the illuminance was measured.
And the average value was calculated and it was set as the illuminance average value.
Also, the difference between the maximum and minimum illuminance was calculated and used as the illuminance difference.
In the illumination device of Example 1, the average illuminance value was 238 (lx), and the illuminance difference was 2.1 (lx).

[Comparative Example 1]
As the light guide rod 10, a colorless and transparent acrylic resin made into a cylindrical shape by molding was used. The light guide rod length d1 was 500 mm, the light guide rod width e1 was 30 mm, and the light guide rod height e2 was 30 mm.

  The reflection grooves were provided in a semicircular shape every 1 mm in a range of 400 mm excluding a range of 50 mm from both ends of the light guide rod 10 by cutting. The width of the reflection groove was 0.1 mm, and the depth of the reflection groove was 0.15 mm.

Otherwise, the lighting device of Comparative Example 1 was manufactured in the same manner as Example 1.
Further, the illuminance was measured in the same manner as in Example 1.
In the illumination device of Comparative Example 1, the average illuminance value was 212 (lx) and the illuminance difference was 25 (lx).

As is clear from the above results, according to the light guide rod of the present invention and the illumination device using the same, uniform light output over a wide angle can be obtained.
In addition, it is not necessary to arrange a large number of light guide bars or move the light guide bars, and the structure is simple and the occupation area is small.
Furthermore, by completely covering the vicinity of the end face of the light guide bar with the reflecting plate, the straightness of the light can be increased and the amount of light can be increased.

  The light guide bar and the lighting device using the same according to the present invention can be used in various configurations, for example, indoor interiors, interior room lights, foot lamps, liquid crystal back panels, and game board lighting devices. Can be used.

DESCRIPTION OF SYMBOLS 10 Light guide rod 11 Main light emission surface 12 Sub light emission surface 13 Main reflection surface 14 Sub reflection surface 20 Light source 21 Light source board 30 Reflection plate 31 Concave surface 40 Light emission surface a1 Light emission length a2 Reflection plate length b1 Reflection plate width c1 Reflection plate Height d1 Light guide rod length e1 Light guide rod width e2 Light guide rod height e3 Arc length e4 Subreflective surface angle e5 Main light output surface width e6 Main reflection surface width f1 Light output angle L1 Light from main light output surface L2 Light from the end of the secondary light exit surface from the main light exit surface L3 Light from the end of the sub light exit surface from the sub reflection surface

Claims (8)

A hexagonal column,
The six sides of the substantially hexagonal prism are respectively
A main light exit surface (11),
Two secondary light exit surfaces (12) located on both sides of the main light exit surface;
A main reflecting surface (13) located opposite to the main light exit surface;
A light guide rod (10) comprising two sub-reflecting surfaces (14) located on both sides of the main reflecting surface,
The main light exit surface (11) is a smooth surface;
The auxiliary light exit surface (12) is an arcuately curved arc surface;
A main reflection groove (15) is provided on the main reflection surface (13) in a direction perpendicular to the longitudinal direction of the light guide rod;
A sub-reflection groove (16) is provided in the sub-reflection surface (14) in a direction orthogonal to the longitudinal direction of the light guide rod,
The length of the main reflection groove (15) is shorter than the length of the sub reflection groove (16),
The light guide rod (10) has a depth of the main reflection groove (15) shallower than a depth of the sub reflection groove (16). The light guide rod (10) according to claim 1, wherein the main reflection surface (13) is a surface curved in a concave shape inward. The length of the main light-emitting surface width (e5), which is the width of the main light-emitting surface (11), is shorter than the length of the main reflective surface width (e6), which is the width of the main reflective surface (13). Light guide rod (10). A lighting device comprising: the light guide bar (10) according to any one of claims 1 to 3; and a light source (20) disposed on an end surface of the light guide bar. The illuminating device according to claim 4, wherein a reflector (30) is disposed adjacent to the main reflection surface (13) and the sub-reflection surface (14). The illuminating device according to claim 5, wherein the reflecting plate (30) has a concave surface formed of either a curved surface or multiple surfaces. The lighting device according to claim 5, wherein the reflection plate (30) covers six side surfaces of the light guide bar (10) in the vicinity of an end face of the light guide bar. A main light exit surface (11),
A main reflecting surface (13) located opposite to the main light exit surface;
A light guide rod (10) having two sub-reflective surfaces (14) located on both sides of the main reflective surface,
The main light exit surface (11) is an arc surface that is curved outwardly and connected to the two sub-reflection surfaces.
A main reflection groove (15) is provided on the main reflection surface (13) in a direction perpendicular to the longitudinal direction of the light guide rod;
A sub-reflection groove (16) is provided in the sub-reflection surface (14) in a direction orthogonal to the longitudinal direction of the light guide rod,
The length of the main reflection groove (15) is shorter than the length of the sub reflection groove (16),
The light guide rod (10) has a depth of the main reflection groove (15) shallower than a depth of the sub reflection groove (16).

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