JP2008262743A - Linear light emitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a linear light emitting device which can emit uniform linear light. <P>SOLUTION: The linear light emitting device is provided with an LED light source 30 to emit near ultraviolet rays and a linear light guide body 11 from the one end side of which the light from the LED light source 30 is introduced. On the upper surface of the linear light guide body 11, light diffusing reflection portions 142, 152, 162, 172, 182, 192, 202 and 212 in which there are mixed phosphors which are excited by the near ultraviolet rays emitted from the LED light source 30 and which emit visible light are formed in islands with predetermined distances, and an emitted light color of the phosphor of at least one island of the light diffusing reflection portions 142, 152, 162, 172, 182, 192, 202 and 212 is different from the emitted light colors of other islands. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a linear light emitting device. Specifically, the present invention relates to an improvement in a light-emitting device that emits light by converting light from a light source into linear light using a light guide.

Conventionally, a linear light-emitting device using a linear light guide is used for illumination or the like. When light is introduced into the linear light guide, the amount of light reaching the farther light source is usually smaller than in the vicinity of the light source. As a result, unevenness in the amount of light emission occurred, resulting in non-uniform linear light. Various studies have been made to solve this problem. For example, Patent Document 1 discloses an illumination device that introduces light from an end surface of a linear light guide and emits linear light from the lower surface by reflecting the light from the upper surface reflection surface. In this illuminating device, the light reflection / diffusion effect is enhanced by providing light diffuse reflection parts having a fixed shape on the upper reflection surface at regular intervals, or providing light diffusion reflection parts that gradually widen away from the light source at regular intervals. . Furthermore, in order to compensate for the decrease in the amount of light reaching the light source farther, the linear light guide is made thinner as the distance from the light source increases. Other conventional techniques include linear light emitting devices disclosed in Patent Documents 2 and 3.
Japanese Patent No. 2900799 JP 2005-114894 A JP 2005-300852 A

In the conventional linear light emitting device, the light diffusive reflection action in the region away from the light source is enhanced to improve the light extraction efficiency in the region away from the light source, thereby reducing the light emission unevenness. However, the amount of light that reaches the region far from the light source is smaller than that in the vicinity of the light source. Therefore, there is a case where light emission unevenness cannot be sufficiently reduced only by enhancing the light diffusive reflection effect in a region away from the light source. This tendency becomes more remarkable as the linear light guide becomes longer. On the other hand, when the light diffusive reflecting portion is widened away from the light source, or the linear light guide is thinned away from the light source, the width of the linear light changes accordingly. That is, linear light having a certain width cannot be obtained. In addition, it is difficult to manufacture a linear light guide whose thickness changes continuously with high accuracy and high yield. Moreover, when the illumination color is locally different and the illumination impression is changed, it is necessary to change the light source device itself.

Accordingly, it is an object of the present invention to provide a linear light-emitting device that solves the above problems and emits uniform linear light and can illuminate various colors. It is another object of the present invention to provide a linear light-emitting device that emits uniform linear light having a certain width and can be manufactured with high accuracy and high yield.

In order to achieve at least one of the above objects, the present invention provides the following linear light-emitting device. That is, an LED light source that emits near-ultraviolet light, and a linear light guide into which light from the LED light source is introduced from one end side, and the near-ultraviolet light emitted from the LED light source on the upper surface of the linear light guide The light diffusion color conversion part mixed with the phosphor excited by visible light and emitting visible light is formed in an island shape at a predetermined interval, and at least a part of the light diffusion color conversion part emits light from the phosphor on the island A linear light emitting device having a color different from that of other islands is used.

In the linear light-emitting device of the present invention, light from the light source is first introduced into the linear light guide. The introduced light is reflected on the upper surface of the linear light guide. On the upper surface of the linear light guide, light diffusion color conversion portions mixed with phosphors are formed at predetermined intervals. Thus, the light in the linear light guide can be color-converted by the light diffusion color conversion unit to be converted into a desired color and emitted from the opposite side.

Further, since the light diffusion color conversion portions of the linear light guide are formed with the same width, the width of the emitted light is formed to be equal, that is, the cut-off of the emitted light becomes clear.

Hereinafter, components in the linear light emitting device of the present invention will be described in detail. (Light Source LED Lamp) The light source is a white LED lamp that obtains white light with blue light and a yellow phosphor, or an LED lamp that emits near ultraviolet rays. This is because the LED lamp is small and has advantages such as resistance to vibration and impact. The type of the LED lamp is not particularly limited, and various types such as a shell type and an SMD type can be adopted. In particular, it is preferable to use, for example, a bullet-type LED lamp having a lens in the LED lamp. This is because the light of the LED lamp having a lens has high directivity, and thus light can be more efficiently introduced into the linear light guide described later. The emission color of the LED lamp is preferably near ultraviolet or white, but a blue-violet LED lamp or a blue LED lamp can be used.

(Linear light guide) As a material of the linear light guide, light-transmitting properties such as acrylic resin, polycarbonate resin, polyethylene terephthalate (PET), silicone resin, epoxy resin and other inorganic materials such as glass Materials can be mentioned. A linear light guide may be formed by combining these materials. Among these, it is preferable to employ an acrylic resin. This is because the acrylic resin has a small light diffusion effect and a high light guide effect. It is also preferable to employ a polycarbonate resin from the viewpoint of ensuring sufficient strength and impact resistance.

The linear light guide is arranged so that light from the light source enters from the end face thereof. The shape of the linear light guide is not particularly limited as long as it is linear. For example, the longitudinal cross section of the linear light guide is substantially circular, substantially elliptical, triangular, quadrangular, pentagonal, hexagonal, or a combination of these shapes. Further, if it is desired to set the irradiation width by the linear light source to be constant, the same width is set.

The linear light guide may include a convex portion that continues along its longitudinal axis. The convex portion is composed of a side surface and an upper surface. The boundary between the side surface and the upper surface of the convex portion is preferably linear. This is because the edge of the light reflected and radiated by the upper surface of the convex portion becomes a straight line, and the parting off becomes clear as linear light. It is preferable that the convex portions are formed with the same width over the whole, and the light emitting surface of the linear light guide has a substantially circular curved cross section. That is, it is preferable that the upper surface of the convex portion is rectangular in plan view. This is because, if the width of the convex portion is made constant, the width of the light diffusing and reflecting portion also coincides with this, so that the light diffusing and reflecting portion having the same width can be formed accurately and easily. The upper surface of the convex portion may be a flat surface or a curved surface. The size of the linear light guide and the size of the convex portion can be determined in consideration of the size of the target irradiation area. For example, the linear light guide can be formed in a cylindrical shape having a diameter of 8 mm and a length of 1 m, and the convex portion can have a constant width with an upper surface width of 2 mm. The linear light guide can be formed by a known method such as molding (extrusion molding or injection molding). In addition, although the plane was formed by the convex part continuous along the longitudinal direction of the linear light guide, a part of the arc of the rod-shaped light guide having a circular cross section may be cut out to form the plane in the longitudinal direction.

A light diffusion color conversion portion containing a phosphor is formed on the upper surface of the convex portion. The light diffusing color converter can be formed by applying or printing a diffuse reflective paint containing a phosphor. When the light diffusing color conversion part is formed by printing, acrylic paint, epoxy paint, urethane paint, or the like can be used. The light diffusion color conversion part is formed so as to cover the entire plane width of the upper surface of the convex part. That is, it is formed continuously from one side parallel to the longitudinal axis to the other side of the upper surface of the convex portion. The light diffusion color conversion parts are formed at predetermined intervals in the longitudinal axis direction. For example, the light diffusion color conversion unit and the density are formed so as to increase as the distance from the light source increases. In addition, the density here refers to the ratio of the area where the light diffusion color conversion part exists in the unit region on the upper surface of the convex part. For example, when a plurality of light diffusion color conversion units having the same length are formed, the interval between adjacent light diffusion color conversion units may be reduced as the distance from the light source increases. In this way, the density of the light diffusion color conversion unit increases as the distance from the light source increases. The interval between adjacent light diffusion color conversion units may be changed continuously or may be changed stepwise. The interval between two adjacent light diffusion color conversion units is not particularly limited, but can be, for example, about 0.5 to 10 mm. Further, the length of the light diffusion color conversion unit (the width in the longitudinal axis direction of the linear light guide) may be changed continuously or stepwise. In this way, it is possible to enhance the light diffusive reflection effect in the light source distal region where the amount of light tends to be insufficient, which contributes to the reduction of light emission unevenness.

The phosphor color mixed in the light diffusion color conversion unit is, for example, a white reflection from the light source side of the length of the linear light guide to red, and the remaining half to white that does not contain the phosphor. Set as a layer. With such a setting, it is possible to change the illumination atmosphere simply by using one linear light guide. In addition, by arranging a red phosphor that is hardly excited by near ultraviolet light or blue light on the side closer to the light source, it is possible to efficiently emit light by irradiating the red phosphor with more light. Become.

In one embodiment of the present invention, a light diffusion color conversion part containing a phosphor is formed on the plane of a convex part formed extending in the longitudinal direction of the linear light guide. The light diffusion color conversion unit is a region including the central region in the longitudinal axis direction on the upper surface of the convex portion, and occupies most of the upper surface of the convex portion. The light diffusion color converter is formed by printing or the like. It is preferable to form the density of the light diffusion color conversion portion so as to increase as the distance from the light source increases. This is because the light diffusion color conversion action in the region away from the light source is enhanced in the light diffusion color conversion unit, and the luminance difference between the region near the light source and the region away from the light source is reduced. In the upper surface of the convex portion, it is preferable not to form the light diffusion color conversion portion in the end region on the proximal side of the light source among the regions excluding the light diffusion color conversion portion. Since the end region on the proximal side of the light source has a large amount of light, if the light diffusion color conversion unit is formed in the end region on the proximal side of the light source, light emission and color conversion are excessively generated, resulting in uneven light emission. If the light diffusion color conversion part is not formed in the end region on the proximal side of the light source, the light in the end region on the proximal side of the light source can be used as light far from the light source. Is prevented.

In the linear light guide, it is preferable to provide a light reflecting layer on the end face on the distal side with respect to the light source (end face opposite to the end face where light is introduced). If the light reflecting layer is provided, the light reaching the end face can be reflected into the linear light guide and used as the linear light of the linear light guide. Thereby, the utilization factor of light improves. The light reflecting layer can be formed by coating or printing of a diffuse reflecting material, light diffuse reflecting treatment such as embossing, and applying a light diffuse reflecting tape. Since the light reflecting layer reflects light into the linear light guide, there is light traveling toward the end surface in the linear light guide and reflected light from the light reflecting layer at the distal end of the light source. Will be. As a result, the amount of light at the end on the distal side of the light source increases.

In another embodiment of the present invention, a first light source, a second light source, a first linear light guide, and a second linear light guide are provided. The first linear light guide and the second linear light guide have the same configuration as the linear light guide described above. The first linear light guide and the second linear light guide are arranged such that their respective longitudinal axes are aligned on the same straight line and their one end faces are opposed to each other, and these opposing end faces are joined. The Furthermore, the light of the first light source is incident on the other end surface of the first linear light guide, and the light of the second light source is incident on the other end surface of the second linear light guide. With this configuration, a long linear light emitting device can be obtained. Furthermore, you may provide a light reflection layer in the junction part of a 1st linear light guide and a 2nd linear light guide.

Of the upper surface of the convex part of the first linear light guide, the density of the light diffusion color conversion part in the end region distal to the first light source is formed so as to decrease as the distance from the light source increases. Of the upper surface of the convex portion of the linear light guide, it is preferable that the density of the light diffusion color conversion portion in the end region distal to the second light source is reduced as the distance from the light source decreases. That is, it is preferable that the light diffusion color conversion portion is formed so that the density decreases toward the joint portion. Since the light from both the first light source and the second light source reaches the vicinity of the joint and the amount of light increases, this configuration prevents excessive light emission near the joint and reduces light emission unevenness and color unevenness. .

Examples of the present invention will be described below.

FIG. 1 shows a perspective view of a vehicle using a linear light emitting device 100 according to one embodiment of the present invention. The linear light emitting device 100 is installed along the side of the vehicle interior ceiling. FIG. 2 shows a perspective view of the linear light emitting device 100. The linear light emitting device 100 includes a white LED light source 2 that includes a linear light guide 11, a blue light emitting element, and a YAG phosphor. The linear light guide 11 is made of acrylic. The white LED light source 30 is a bullet-type LED lamp. The white LED light source 30 is arranged so that the light emission side faces the side end face 12 of the linear light guide 11. The shape of the linear light guide 11 is a substantially columnar shape having a length of 50 cm and a diameter of about 8 mm. As shown in the longitudinal section of FIG. The convex portion 13 is continuously formed along the longitudinal axis of the linear light guide 11. In addition, the convex part upper surface 14 of the convex part 13 is a plane. The lower part of the linear light guide 11 (on the side opposite to the convex part 13) is a light emitting part 15. As shown in FIG. 3, the linear light emitting device 100 is installed in the casing 40. A lower portion of the casing 40 is opened, and light from the light emitting unit 15 is emitted through the opening. The linear light guide 11 is formed by injection molding.

FIG. 4 shows a top view of the linear light guide 11. The linear light guide 11 arranges the white LED light source 30 on the side end face 12, and the first section 110, the second section 120, and the third section from the side end face 12 toward the white LED light source 30 distal end face 16. 130, the fourth section 140, the fifth section 150, the sixth section 160, the seventh section 170, the eighth section 180, the ninth section 190, the tenth section 200, and the eleventh section 210. The lengths of the second to tenth sections 120 to 200 are each 5 cm in the longitudinal axis direction. The lengths of the first section 110 and the eleventh section 210 are 2.5 cm in the longitudinal axis direction, respectively. The light diffusion color conversion part is not formed on the convex part upper surface 14 of the first section 110. An epoxy system in which a red phosphor ((Sr, Ca, Ba) 2Si5N8: Eu) excited by blue light of about 4.0 mm is mixed with a white pigment made of titanium oxide on the upper surface 14 of the second section 120. Five light diffusing color conversion parts 121 printed with paint are formed at intervals of about 6.0 mm. Five light diffusion color conversion parts 131 made of the same material as that used in the second section of about 5.0 mm are formed on the upper surface 14 of the convex section of the third section 130 at an interval of about 5.0 mm. The fourth section 140 is a light diffusing light printed with an epoxy-based paint containing only about 6.0 mm3 which is a light diffusing color converting portion 141 made of the same material as that used in the second section and a white pigment made of titanium oxide. About 6.0 mm 2 that is the reflection portion 142 are alternately formed at an interval of about 4.0 mm. The fifth section 150 is a light diffusion printed with an epoxy-based paint containing only about 7.0 mm2 which is a light diffusion color conversion unit 151 made of the same material as that used in the second section and a white pigment made of titanium oxide. About 7.0 mm3, which are the reflective portions 152, are alternately formed at intervals of about 3.0 mm. In the sixth section 160 and the seventh section 170, about 7.0 mm and five light diffusion reflection portions 162 and 172 printed with an epoxy-based paint containing only a white pigment made of titanium oxide are formed at intervals of about 3.0 mm. Has been. In the eighth section, about 8.0 mm5, which are light diffusing and reflecting portions 182 printed with an epoxy-based paint containing only a white pigment, are formed at intervals of about 2.0 mm. On the upper surface 14 of the convex portion 14 of the ninth section 190, five light diffusive reflecting portions 192 printed with an epoxy-based paint containing only a white pigment of about 9.0 mm are formed at intervals of about 1.0 mm in each section. . On the upper surface 14 of the convex section of the tenth section 200 and the eleventh section 210, light diffusive reflection portions 202 and 212 are formed on the entire section, which are printed with an epoxy paint that contains only a white pigment.

By forming each light diffusing color conversion part and each light diffusing reflection part as described above, the ratio of the area occupied by the total of the light diffusing color conversion part and the light diffusing reflection part in each section (that is, density) The ratio increases from the second section 120 toward the tenth section 200.

The light diffusion color conversion parts 121 to 151 and the light diffusion reflection parts 142 to 212 are formed over the entire width of the convex upper surface 14 having a constant width. Accordingly, the light diffusion color conversion units 121 to 151 and the light diffusion reflection units 142 to 212 can be easily made the same width, and can be accurately formed without positional deviation. A light reflection process is performed on the distal end face 16 of the linear light guide 11 opposite to the white LED light source 30 by printing with an epoxy white paint.

The light emission mode of the linear light emitting device 100 will be described below. Light emitted from the white LED light source 30 enters the linear light guide 11 from the side end face 12 of the linear light guide 11. Incident light is guided through the linear light guide 11 while being reflected by the upper surface 14 of the convex portion. Among these, the light reaching the light diffusion color conversion units 121 to 151 on the upper surface 14 of the convex portion converts part of the blue light mixed in the white light into red light, and diffusely reflects together with the remaining unconverted light. Then, it is positively emitted from the light emitting part 15. Further, the light reaching the light diffusing reflection parts 142 to 212 is diffusely reflected and positively emitted from the light emitting part 15 to the outside. Accordingly, the light around the light emitting unit 15 in which the light diffusion color conversion units 121 to 151 are arranged is emitted in a color that is reddish than the light emitted from the white LED light source 2, and is close to the light bulb color. The light around the light emitting unit 15 where the light diffusion color conversion units 121 to 151 are not arranged is illuminated with a color close to the light emitted from the white LED light source 2. An illumination device in which the illumination color changes from the light bulb color to the daylight color as it goes from the second compartment to the eleventh compartment can be obtained.

In addition, as described above, the light diffusion color conversion units 121 to 151 and the light diffusion reflection units 142 to 212 are accurately formed without misalignment, and thus the light diffusion color conversion units 121 to 151 and the light diffusion reflection units 142 to 142 are formed. The linear light diffused and reflected by 212 has a constant line width. Furthermore, since the ends (edges) in the width direction of the light diffusion color conversion units 121 to 151 and the light diffusion reflection units 142 to 212 coincide with the end of the upper surface of the convex portion 13, the boundary in the width direction of the linear light is clear. Become. As a result, the edges of the light diffusion color conversion unit and the light diffusion reflection unit become clear. As a result, the edge of the emitted linear light becomes clear and the parting of the linear light becomes clear.

In addition, the light diffusion color conversion units 121 to 151 and the light diffusion reflection units 142 to 212 are arranged so that the ratio of the area occupied by the light diffusion color conversion unit and the light diffusion reflection unit increases from the second division 120 to the tenth division 200. Is formed. Thereby, in the 2nd division 120 to the 10th division 200, the light diffusion reflection effect by the convex part upper surface 14 increases as it leaves | separates from the white LED light source 30. FIG. As a result, the light extraction rate in a region away from the white LED light source 30 with a small amount of light reaching the light source is improved, and uneven light emission is reduced. Furthermore, since the light diffusion color conversion units 121 to 151 containing phosphors that require light excitation from the second section 120 to the fifth section 150 are arranged at positions close to the white LED light source 30, color conversion can be performed efficiently. Furthermore, since the distal end surface 16 is a reflecting surface, the light that guides the linear light guide 11 toward the distal end surface 16 near the distal end surface 16 is transmitted to the distal end surface 16. Therefore, it can be effectively used as light reflected in the linear light guide 11. Furthermore, the light diffuse reflection part is not provided in the first section 110 in the vicinity of the white LED light source 30. As a result, light is not actively emitted outside in the vicinity of the white LED light source 30. And the light which was not emitted from the white LED light source 30 vicinity area | region guides the linear light guide 11, and will be utilized as light of the area | region away from the white LED light source 2. FIG. As a result, the amount of light emission in the region near the white LED light source 30 with a large amount of light decreases, and the amount of light emission in a region away from the white LED light source 30 with a small amount of light increases, thereby reducing light emission unevenness.

Of the light diffusing color conversion section and the light diffusing reflection section provided on the upper surface of the convex portion 13 of the linear light guide 11, the light diffusing color conversion sections 121 to 151 and the light diffusing reflection sections 142 to 212 are within the same section. The light diffusion color conversion unit and the light diffusion reflection unit having the same length but different lengths may be included.

A linear light-emitting device 700 that is another embodiment of the present invention will be described. FIG. 5 shows a perspective view of the linear light emitting device 700. The linear light-emitting device 700 includes a linear light guide 51 and a near-ultraviolet LED light source 60 having an emission peak at about 380 nm. The linear light guide 51 is made of acrylic. The near-ultraviolet LED light source 60 uses an LED lamp having a lens in CAN. The near-ultraviolet LED light source 60 is arranged so that the light emission side faces the side end face 52 of the linear light guide 51. The shape of the linear light guide 51 is a substantially cylindrical shape having a length of 50 cm and a diameter of about 8 mm. As shown in the longitudinal section of FIG. It is formed as a notch. The flat part 53 is continuously formed along the longitudinal axis of the linear light guide 51. Note that the upper surface of the flat portion 53 is a flat surface. The lower part of the linear light guide 51 (on the side opposite to the flat part 53) is a light emitting part 55. The linear light guide 51 is formed by injection molding.

FIG. 7 shows a top view of the linear light guide 51. The linear light guide 51 has a first section 510, a second section 520, a third section 530, a first section from the side end face 52 on which the near-ultraviolet LED light source 60 is disposed toward the distal end face 56 of the near-ultraviolet LED light source 2. It is divided into four sections 540, fifth section 550, sixth section 560, seventh section 570, eighth section 580, ninth section 590, tenth section 600, and eleventh section 610. The lengths of the first to ninth sections 510 to 590 are 5 cm in the longitudinal axis direction. The lengths of the tenth section 600 and the eleventh section 610 are 2.5 cm in the longitudinal axis direction. The light diffusion color conversion part is not formed in the flat part 53 of the first section 510. An epoxy system in which a red phosphor ((Sr, Ca, Ba) 2Si5N8: Eu) excited by a near ultraviolet light of about 4.0 mm is mixed with a white pigment made of titanium oxide in the flat portion 53 of the second section 520. Five pieces are formed at an interval of about 6.0 mm from the light diffusion color conversion portion 521 on which the paint is printed. In the flat portion 53 of the third section 530, five light diffusion color conversion portions 531 made of the same material as that used in the second section of about 5.0 mm are formed at an interval of about 5.0 mm. In the fourth section 540, about 6.0 mm, which is a light diffusion color conversion unit 541 made of the same material as that used in the second section, is formed at an interval of about 4.0 mm. The fifth section 550 is a light diffusion color conversion unit 551 that is printed with an epoxy-based paint in which an orange phosphor (CaSr0.5Al3Si9N16: Eu) excited by near ultraviolet light is mixed with a white pigment made of titanium oxide. .5 mm are formed at intervals of about 3.0 mm. In the sixth section 560 and the seventh section 570, about 7.0 mm and five light diffusion color conversion portions 561 and 571 made of the same material as those used in the fifth section are formed at intervals of about 3.0 mm. Yes. The eighth section 580 includes a blue phosphor ((BaSr) MgAl10O17: Eu), a red phosphor ((Sr, Ca, Ba) 2Si5N8: Eu) and a green phosphor ((Ba, Sr) 2SiO4: Eu) and white. About 8.0 mm5, which is a light diffusing color conversion portion 581 that emits white light and printed with an epoxy paint containing a pigment, is formed at intervals of about 2.0 mm. On the flat portion 53 of the ninth section 590, about 9.0 mm5 pieces of light diffusion color conversion portions 591 made of the same material as that used in the eighth section are formed at an interval of about 1.0 mm. In the flat section 53 of the tenth section 600 and the eleventh section 610, light diffusion color conversion sections 601 and 611 made of the same material as that used in the eighth section 580 are uniformly formed on the entire section.

The light emission mode of the linear light emitting device 700 will be described below. The light emitted from the near-ultraviolet LED light source 60 enters the linear light guide 51 from the side end face 52 of the linear light guide 51. Incident light is guided through the linear light guide 51 while receiving the reflecting action of the flat portion 53. Among these, the light that has reached the light diffusion color conversion units 521 to 611 of the flat portion 53 converts a part of near-ultraviolet light into red, orange, and white, is diffusely reflected, and is actively emitted from the light emission unit 55. Is done. Therefore, the light around the light emitting unit 55 where the light diffusion color conversion units 521 to 611 are arranged is emitted as a color converted by the light diffusion color conversion unit, and is illuminated with various colors. .

In addition, since the light diffusion color conversion units 521 to 611 are accurately formed without positional deviation as described above, the linear light that is diffusely reflected and emitted by the light diffusion color conversion units 521 to 611 is a fixed line. It becomes width. Furthermore, since the ends (edges) in the width direction of the light diffusion color conversion units 521 to 611 coincide with the ends of the upper surface of the flat portion 53, the boundary in the width direction of the linear light becomes clear. As a result, the edges of the light diffusion color conversion unit and the light diffusion reflection unit become clear. As a result, the edge of the emitted linear light becomes clear and the parting of the linear light becomes clear.

Further, the light diffusion color conversion units 521 to 611 are formed so that the ratio of the area occupied by the light diffusion color conversion unit from the second division 520 to the tenth division 600 increases. Thereby, in the 2nd division 520 to the 10th division 600, the light diffusion reflection effect by the flat part 53 will increase as it leaves | separates from the near ultraviolet LED light source 60. FIG. As a result, the light extraction rate in a region away from the near-ultraviolet LED light source 60 with a small amount of light reaching the light source is improved, and uneven light emission is reduced. Further, since the distal end surface 56 is a reflecting surface, in the vicinity of the distal end surface 56, the light that guides the linear light guide 51 toward the distal end surface 56 is transmitted to the distal end surface 56. Therefore, it can be effectively used as light reflected in the linear light guide 51.

The light diffusion color conversion unit provided on the upper surface of the flat portion 53 of the linear light guide 51 has the same length, but may include a light diffusion color conversion unit having a different length.

Further, as another example, the light diffusing color conversion part and / or the light diffusing reflection part is arranged on the convex part or flat part of the linear light guide by printing. It is also possible to form a light diffusion color conversion portion and / or a light diffusion reflection portion by forming a groove in the portion or the flat portion and burying a light diffusion color conversion material or a light diffusion reflection material in the groove.

The linear light-emitting device of the present invention can be used as a light source for various illuminations.

FIG. 1 is a perspective view of a vehicle 100 using a linear light emitting device 1 according to an embodiment of the present invention. FIG. 2 is a perspective view of the linear light emitting device 1. FIG. 3 is a longitudinal section of the linear light guide 11. FIG. 4 is a top view of the linear light guide 11. FIG. 5 is a perspective view of a linear light emitting device 700 according to another embodiment. FIG. 6 is a longitudinal section of a linear light guide 51 of another embodiment. FIG. 7 is a top view of a linear light guide 51 according to another embodiment.

Explanation of symbols

100 700 Linear light emitting device 30 White LED light source 11 51 Linear light guide 13 Convex part 14 Convex part upper surface 121 131 141 151 521 531 541 551 561 571 581 591 601 611 Light diffusion color conversion part 142 152 162 172 182 192 202 212 Light diffuse reflection part

Claims (4)

An LED light source that emits near-ultraviolet light, and a linear light guide into which light from the LED light source is introduced from one end side, and is excited by near ultraviolet light emitted from the LED light source on the upper surface of the linear light guide In addition, islands are formed at predetermined intervals in which light-diffusing and reflecting portions mixed with phosphors emitting visible light are emitted, and at least a part of the light-diffusing and reflecting portions has an emission color of the phosphors of the other islands. A linear light-emitting device, which is different from the light-emitting color. A convex portion is formed on the upper surface of the linear light guide with the same width over the entire surface, and the light emitting surface of the linear light guide has a substantially circular curved surface. Item 2. The linear light-emitting device according to Item 1. 3. The linear shape according to claim 1, wherein the light diffusing reflection part is formed on a groove in a direction perpendicular to a longitudinal direction of the linear light guide, and the phosphor is filled in the groove. Light emitting device. The linear light-emitting device according to claim 1, wherein the linear light guide includes a light reflecting layer on an end surface on a distal side with respect to the LED light source.