JP2008153020A - Light guide body and light guide body emission unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light guide body and a light guide body emission unit realizing uniform plane light emission with manufacturing cost curtailed and versatility improved. <P>SOLUTION: The light guide body emission unit is provided with a long-size light guide body 100 and LED emission parts 20, 30 fitted at either end of the light guide body 100 and irradiating light on the light guide body 100. The light guide body 100 is provided with a light-transmitting hollow member 110 irradiating light from its both end faces, a tubular reflecting member 120 arranged at an inner space of the hollow member 110 for reflecting light irradiated from an inner periphery face of the hollow member 110, and a tubular diffusion lens 130 arranged outside the hollow member 110 so as to cover the whole and diffusing light irradiated from an outer periphery face of the hollow member 110. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a light guide and a light guide light-emitting unit used for road signs and the like, and more particularly to a light guide and a light guide light-emitting unit that emit light using an LED as a light source.

  Conventionally, as a light guide light emitting unit used for road signs and the like, a light guide plate type display device 900 has a frame 920 formed around a rectangular light guide plate 910 as shown in FIG. A vertical light source 930 and a horizontal light source 940 are accommodated. In this figure, the display unit is omitted, and the vertical light source 930 and the horizontal light source 940 are drawn from the front side so that the front side of the frame 920 is partially broken. When the light guide plate type display device 900 is installed, the direction α in the figure is upward, and a plurality of LEDs mounted on the substrate 931 facing the longitudinal end surface 911 of the light guide plate 910 are arranged in a row at intervals in the vertical direction. The light is incident on the longitudinal end surface 911 from the vertical light source 930 in the direction β in the figure. Further, a horizontal light source 940 that is a cold cathode tube is provided directly opposite the lateral end surface 912 of the light guide plate 910, and the direction perpendicular to the direction β in the figure from the lateral light source 940 to the lateral end surface 912 is provided. Light is made incident on Y, and a reflector 950 is provided on the side opposite to the direction Y of the horizontal light source 940.

Since one of the vertical light source 930 and the horizontal light source 940 is a cold cathode tube and / or a fluorescent tube, the amount of light is supplemented by the cold cathode tube and / or the fluorescent tube in the immediate vicinity of the LED, and the LED is used as the light source. Even when it is used, it is possible to sufficiently obtain the light emission brightness in the immediate vicinity of the light source, and even if the interval between the LEDs is not so small, the illumination unevenness generated between the plurality of LEDs can be emitted uniformly from the cold cathode tube and / or the fluorescent tube. Even if the light guide plate is made large in size, it is possible to easily make the brightness of the entire light guide plate uniform at a low cost (see, for example, Patent Document 1).
JP 2006-172843 A

  However, in the light guide light emitting unit as described above, a large number of light emitting units emit light directly to the light guide plate by using the vertical directivity that is the characteristic of the light of the LED, so that the light guide plate emits surface light. LED is required, and the manufacturing cost of the light guide light emitting unit increases. Further, since the light emitting surface of the light guide plate must be secured, the unit shape is limited and the versatility is low.

  An object of the present invention is to provide a light guide and a light guide light-emitting unit that can realize uniform surface light emission, reduce manufacturing costs, and improve versatility.

  In order to achieve the above object, a light guide according to claim 1 is provided in a light transmissive tubular member irradiated with light from at least one end face, and an inner space of the light transmissive tubular member, and the light transmissive member. A tubular reflecting member that reflects light emitted from the inner circumferential surface of the transparent tubular member, and an outer surface of the light transmissive tubular member that covers the entire tubular member, and is emitted from the outer circumferential surface of the light transmissive tubular member. And a tubular diffusing lens for diffusing light.

  The light guide according to claim 2 is the light guide according to claim 1, wherein the light-transmitting tubular member is an acrylic resin hollow member having a substantially circular cross section.

  The light guide according to claim 3 is the light guide according to claim 1 or 2, wherein the light transmissive tubular member has a plurality of grooves provided at equal intervals along the circumferential direction on the inner peripheral surface thereof. It is characterized by having.

  The light guide according to claim 4 is the light guide according to claim 3, wherein the pitch of the plurality of grooves is 1.5 to 2.76 mm.

  The light guide according to claim 5 is the light guide according to claim 3 or 4, wherein the groove has a substantially V-shaped cross section, and has two tapered surfaces inclined so as to approach each other. It is characterized by.

  The light guide according to claim 6 is the light guide according to claim 1, wherein the tubular diffusing lens has a plurality of convex portions provided at equal intervals along the circumferential direction on the inner peripheral surface thereof. It is characterized by that.

  The light guide according to claim 7 is attached so as to abut on a light transmissive long member irradiated with light from at least one end face, and a surface parallel to the longitudinal direction of the light transmissive long member, A long reflective member that reflects light emitted from the light transmissive long member; and the light transmissive long member that is disposed outside the light transmissive long member so as to cover the entire light transmissive long member. And a tubular diffusion lens that diffuses light emitted from the outer peripheral surface of the long member.

  The light guide according to claim 8 is the light guide according to claim 7, wherein the light transmissive long member is a solid member made of acrylic resin having a substantially circular cross section, and the long reflective member is It is attached to a part of the outer peripheral surface of the light transmissive long member.

  The light guide according to claim 9 is the light guide according to claim 8, wherein the light transmissive long member is equally spaced along the circumferential direction on the outer peripheral surface contacting the long reflective member. It has the provided several groove part.

  The light guide according to claim 10 is the light guide according to claim 9, wherein the pitch of the plurality of groove portions is 1.5 to 2.76 mm.

  The light guide according to claim 11 is the light guide according to claim 9 or 10, wherein the groove has a substantially V-shaped cross section, and has two tapered surfaces inclined so as to approach each other. It is characterized by.

  The light guide according to claim 12 is the light guide according to claim 7, wherein the tubular diffusing lens has a plurality of convex portions provided at equal intervals along the circumferential direction on the inner peripheral surface thereof. It is characterized by that.

  A light guide light emitting unit according to claim 13 includes the light guide according to any one of claims 1 to 12 and an LED light emitting unit that emits light from at least one end face of the light guide. It is characterized by that.

  According to the light guide body according to claim 1, a light transmissive tubular member irradiated with light from at least one end face, and an inner periphery of the light transmissive tubular member arranged in an internal space of the light transmissive tubular member. A tubular reflecting member that reflects light emitted from the surface, and a tubular member that is disposed outside the light transmissive tubular member so as to cover the entire tubular member and diffuses light emitted from the outer peripheral surface of the light transmissive tubular member Since the diffusing lens is provided, uniform surface emission can be realized, the manufacturing cost can be reduced, and the versatility can be improved.

  According to the light guide of claim 7, the light transmissive long member irradiated with light from at least one end surface, and the light transmissive long member attached so as to abut on a surface parallel to the longitudinal direction of the light transmissive long member. A long reflecting member that reflects light emitted from the light transmissive elongate member, and an outside of the light transmissive elongate member so as to cover the entire light transmissive elongate member, and the light Since the tubular diffusing lens that diffuses the light emitted from the outer peripheral surface of the transmissive long member is provided, it is possible to achieve uniform surface light emission on a predetermined surface, reduce manufacturing costs, and improve versatility.

  The light guide according to claim 13 includes the light guide according to any one of claims 1 to 12 and an LED light emitting unit that emits light from at least one end face of the light guide. Therefore, by using the LED as the light source, power consumption can be reduced and durability can be improved as compared with the conventional straight tube fluorescent lamp.

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

  FIG. 1 is a perspective view schematically showing a configuration of a light guide light-emitting unit including a light guide according to the first embodiment of the present invention.

  As shown in FIG. 1, the light guide body light emitting unit 10 is attached to both ends of the long light guide body 100 and the light guide body 100, and the LED light emitting sections 20 and 30 that irradiate the light guide body 100 with light. With.

  The LED light emitting unit 20 irradiates light to the light guide 100 along the longitudinal direction from one end face of the light guide 100. Specifically, the LED light emitting unit 20 includes a substantially cylindrical frame, a plurality of chip substrates fixed to the frame, a bullet-type (round) LED mounted on each of the plurality of chip substrates, and each LED. It comprises a mold part to be covered, and a plurality of electrode parts formed on both side edges of each chip substrate. A substantially cylindrical frame body is provided with a conductor (not shown), and a plurality of chip substrates are electrically connected to each other through the conductor.

  The LED light emitting unit 20 irradiates light to the light guide body 100 along the longitudinal direction from the other end surface of the light guide body 100. Since the configuration of the LED light emitting unit 30 is basically the same as that of the LED light emitting unit 20, the description thereof is omitted.

  2A and 2B are diagrams showing the configuration of the light guide 100 in FIG. 1, wherein FIG. 2A is a cross-sectional view in the radial direction, and FIG. 2B is a cross-sectional view in the longitudinal direction.

  2 (a) and 2 (b), the light guide 100 is disposed in the inner space of the hollow member 110 and the light transmissive hollow member 110 irradiated with light from both end faces thereof. A tubular reflecting member 120 that reflects light emitted from the inner peripheral surface and a tubular diffusion lens 130 that is disposed outside the hollow member 110 so as to cover the entire hollow member 110 and diffuses light emitted from the outer peripheral surface of the hollow member 110. With. The hollow member 110, the tubular reflecting member 120, and the tubular diffusing lens 130 are arranged substantially coaxially.

  The hollow member 110 is a long cylindrical member having a substantially circular cross section, and has a length of, for example, 1000 mm, an outer diameter and an inner diameter of, for example, 29φ and 14φ, and a thickness of, for example, 7.5 mm. The hollow member 110 is made of an acrylic resin having high transparency. The refractive index of the acrylic resin is about 1.49, and the critical angle (total reflection angle) calculated from this value is about 42.2 degrees. The hollow member 110 may be made of an acrylic transparent resin containing particles such as beads.

  3 is a partially enlarged cross-sectional view of the end portion of the light guide 100 in FIG.

  As shown in FIG. 3, the hollow member 110 has a plurality of grooves 111 provided at equal intervals along the circumferential direction on the outer peripheral surface thereof. The pitch D1 of the groove part 111 is 1.5-2.76 mm, for example. The groove 111 has a substantially V-shaped cross section, and has tapered surfaces 111a and 111b inclined so as to approach each other. That is, the outer peripheral surface of the hollow member 110 is provided with a surface 111c parallel to the axial direction and tapered surfaces 111a and 111b having different angles with respect to the axial direction. The angle between the tapered surfaces 111a and 111b is, for example, 95 degrees.

  The tubular reflecting member 120 is made of a vinyl chloride resin with a plating deposited on the outer peripheral surface thereof, and the outer diameter and inner diameter thereof are, for example, 13φ and 11φ, and the thickness thereof is, for example, 1.0 mm. The tubular reflecting member 120 may be made of stainless steel whose outer peripheral surface is mirror-finished.

  The tubular diffusing lens 130 has a plurality of convex portions 131 provided at equal intervals along the circumferential direction on the inner peripheral surface thereof, and the outer diameter and inner diameter thereof are, for example, 32φ and 30φ, and the thickness thereof is For example, 1.0 mm. The pitch D2 of the convex portions 131 is, for example, 0.5 mm or more.

  In the light guide 100 configured as described above, the light emitted from the LED light emitting units 20 and 30 is incident from both end surfaces of the hollow member 110. Of the light incident on the hollow member 110, the light that collides with the surface 111 c on the inner peripheral surface and the outer peripheral surface at an angle equal to or less than the critical angle repeats total reflection on the inner peripheral surface and the outer peripheral surface of the hollow member 110. Proceed through 110. On the other hand, the light colliding with the tapered surfaces 111a and 111b on the outer peripheral surface is refracted by the tapered surfaces 111a and 111b and emitted to the tubular diffusing lens 130, and part of the light is reflected by the tapered surfaces 111a and 111b to be hollow members. The light is refracted on the inner peripheral surface of 110 and is emitted to the tubular reflecting member 120.

  The light emitted to the tubular reflecting member 120 is totally reflected on the outer peripheral surface of the tubular reflecting member 120, refracted on the inner peripheral surface of the hollow member 110, and enters the hollow member 110 again. The light incident on the hollow member 110 again is emitted from the outer peripheral surface of the hollow member 110 or travels through the hollow member 110.

  The light emitted to the tubular diffusion lens 130 collides with the convex portion 131 of the tubular diffusion lens 130 and diffuses. The diffused light is emitted from the outer peripheral surface of the tubular diffusing lens 130 to the outside.

  By repeating the above mechanism throughout the entire length of the light guide 100, the light emitted from the LED light emitting units 20 and 30 is uniformly scattered throughout the light guide 100. The entire outer peripheral surface emits light uniformly.

  According to the present embodiment, the light guide 100 includes the light-transmitting hollow member 110 that is irradiated with light from both end surfaces, and the light that is disposed in the internal space of the hollow member 110 and is emitted from the inner peripheral surface of the hollow member 110. And a tubular diffusion lens 130 that is disposed outside the hollow member 110 so as to cover the entire hollow member 110 and diffuses light emitted from the outer peripheral surface of the hollow member 110. In addition to realizing uniform surface light emission of the entire 100, the manufacturing cost can be reduced and the versatility can be improved. Further, by using an LED as a light source, it is possible to realize a reduction in power consumption and an improvement in durability as compared with a conventional straight tube fluorescent lamp (FL). In addition, since an LED is used as the light source, the light guide body 100 can emit light in various colors such as red, yellow, white, green, and blue by selecting the color of the LED.

  In the present embodiment, the hollow member 110 is a long cylindrical member having a substantially circular cross section, but is not limited thereto, and may be a long member having a substantially polygonal cross section.

  In the present embodiment, the reflecting member 120 is tubular, but may be a long solid member or a long member having a substantially polygonal cross section.

  In the present embodiment, the LED light emitting units 20 and 30 are attached to both end faces of the light guide 100, but the present invention is not limited to this, and the LED light emitting part 20 or 30 is attached to one end face of the tubular light guide 10. May be. Thereby, the manufacturing process can be further simplified and the manufacturing cost can be further reduced.

  4A and 4B are diagrams showing a modification of the light guide 100 in FIG. 2, where FIG. 4A is a radial sectional view and FIG. 4B is a longitudinal sectional view.

  4 (a) and 4 (b), the light guide 400 is long in the range of about 120 degrees in the axial direction of the light-transmitting long member 410 irradiated with light from both end faces thereof. A cross-section substantially arc-shaped reflection member 420 that is attached so as to contact a part of the outer peripheral surface of the member 410 and reflects light emitted from the surface of the long member 410, and a long member that covers the entire long member 410 And a tubular diffusing lens 430 for diffusing light emitted from the outer peripheral surface of the long member 410. The long member 410, the reflecting member 420, and the tubular diffusing lens 430 are disposed substantially coaxially.

  The long member 410 is a solid member having a substantially circular cross section, and has a length of, for example, 1000 mm and an outer diameter of, for example, 15φ. The long member 410 is made of, for example, an acrylic resin having high transparency. The long member 410 may be made of an acrylic transparent resin containing particles such as beads.

  FIG. 5 is a partial enlarged cross-sectional view of the end portion of the light guide 400 in FIG.

  As shown in FIG. 5, the long member 410 has a range of about 120 degrees in the axial direction (angle α in FIG. 4B) along the circumferential direction on the outer peripheral surface in contact with the reflecting member 420. A plurality of groove portions 411 provided at intervals are provided. The pitch D3 of the groove part 411 is, for example, 1.5 to 2.76 mm. The groove portion 411 has a substantially V-shaped cross section, and has tapered surfaces 411a and 411b inclined so as to approach each other. That is, on the outer peripheral surface of the long member 410, a surface 111c parallel to the axial direction and tapered surfaces 411a and 411b having different angles with respect to the axial direction are provided. The angle between the tapered surfaces 411a and 411b is, for example, 95 degrees.

  The reflecting member 420 is an R7.5 arc-shaped member having a plastic reflecting plate attached to its inner curved surface, and is made of, for example, a PET foam sheet. The thickness of the reflection member 420 is, for example, 1.0 mm. The reflection member 420 has a total reflectance of 99%, for example, and a diffuse reflectance of 95%, for example.

  The tubular diffusion lens 430 has a plurality of convex portions 431 provided at equal intervals along the circumferential direction on the inner peripheral surface thereof, and the outer diameter and inner diameter thereof are, for example, 19φ and 17φ, and the thickness thereof is For example, 1.0 mm. The pitch D4 of the convex portion 431 is, for example, 0.5 mm or more.

  The light emitted by the LED light emitting units 20 and 30 is incident from both end surfaces of the long member 410. Of the light incident on the long member 410, the light that collides with the surface 411 c on the outer peripheral surface at an angle equal to or smaller than the critical angle repeats total reflection on the inner peripheral surface and the outer peripheral surface of the long member 410 and repeats total reflection in the tubular member 410. Continue on. On the other hand, the light colliding with the taper surfaces 411a and 411b on the outer peripheral surface is refracted by the taper surfaces 411a and 411b and emitted to the reflecting member 420, and part of the light is reflected by the taper surfaces 411a and 411b and reflected in FIG. Proceed in the direction of the arrow b).

  The light emitted to the reflecting member 420 is totally reflected on the outer peripheral surface of the reflecting member 420, is refracted on the inner peripheral surface of the long member 410, and is incident on the long member 410 again. The light incident on the long member 410 again is emitted from the outer peripheral surface of the long member 410 or travels through the long member 410.

  4B is emitted from the outer peripheral surface of the long member 410, collides with the convex portion 431 of the tubular diffusion lens 430, and is diffused. The diffused light is emitted from the outer peripheral surface of the tubular diffusion lens 430 to the outside.

  By repeating the above mechanism throughout the entire length in the light guide 400, the light emitted from the LED light emitting units 20 and 30 is on the outer peripheral surface in the range of about 270 degrees in the axial direction of the light guide 400. The light is uniformly scattered, so that the outer peripheral surface of the light guide 400 emits light uniformly.

  According to the above configuration, the light guide 400 is attached to a part of the outer peripheral surface of the long member 410 and the light transmissive long member 410 irradiated with light from both end surfaces thereof. A cross-sectional substantially arc-shaped reflecting member 420 that reflects light emitted from the peripheral surface, and the long member 410 are disposed outside the long member 410 so as to cover the entire long member 410, and diffuses light emitted from the outer peripheral surface of the long member 410. Since the tubular diffuser lens 430 is provided, it is possible to achieve uniform surface light emission on a predetermined surface of the light guide 400, reduce the manufacturing cost, and improve versatility.

  In the present embodiment, the elongated member 410 is a solid member having a substantially circular cross section, but is not limited thereto, and may be a solid member having a substantially polygonal cross section.

  Moreover, in this Embodiment, although the reflection member 420 is a cross-sectional substantially arc type, it is not restricted to this, A cross-sectional substantially rectangular shape may be sufficient. The reflection member 420 is attached so as to contact a part of the outer peripheral surface of the long member 410, but is not limited thereto, and is attached so as to contact a surface parallel to the longitudinal direction of the long member 410. May be.

  In the present embodiment, the reflection member 420 is attached to the outer peripheral surface of the long member 410 in the range of about 120 degrees in the axial direction, but is not limited to this, and other angles may be used depending on the use application. It may be attached to the outer peripheral surface of the long member 410 in a range.

  6A and 6B are diagrams illustrating another modification of the light guide 100 in FIG. 2, in which FIG. 6A is a cross-sectional view in the radial direction, and FIG. 6B is a cross-sectional view in the longitudinal direction.

  6 (a) and 6 (b), the light guide 600 has a pair of light-transmitting saddle-shaped members 610a and 610b that are irradiated with light from both end surfaces thereof, and respective planes of the saddle-shaped members 610a and 610b. A pair of reflective members 620a, 620b that reflect light emitted from the flat surfaces of the saddle-shaped members 610a, 610b and a pair of saddle-shaped members 610a, 610b are covered. A tubular diffusing lens 630 is provided outside the mold members 610a and 610b and diffuses light emitted from the outer peripheral curved surfaces of the pair of saddle-shaped members 610a and 610b.

  FIG. 7 is a partial enlarged cross-sectional view of the end portion of the light guide 600 in FIG.

  As shown in FIG. 7, the saddle-shaped member 610 a has a plurality of groove portions 611 provided at equal intervals along the radial direction in the plane. The pitch D5 of the groove part 611 is 1.5-2.76 mm, for example. The groove portion 611 has a substantially V-shaped cross section, and has tapered surfaces 611a and 611b inclined so as to approach each other. That is, the outer surface of the saddle member 610a is provided with a plane 611c and a curved surface 611d parallel to the axial direction, and tapered surfaces 611a and 611b having different angles with respect to the axial direction. The angle between the tapered surfaces 611a and 611b is, for example, 95 degrees. Note that the configuration of the saddle member 610b is the same as that of the saddle member 610a, and thus the description thereof is omitted.

  The reflecting member 620a is a plate-like member having a plastic reflecting plate attached to one main surface thereof, and is made of, for example, a PET foam sheet. The thickness of the reflecting member 620a is, for example, 1.0 mm. The total reflectance of the reflecting member 620a is, for example, 99%, and the diffuse reflectance is, for example, 95%. In addition, since the structure of the reflection member 420b is the same as that of the reflection member 420a, the description is abbreviate | omitted.

  The tubular diffusing lens 630 is a diffusing lens having a plurality of convex portions 631 provided at equal intervals along the circumferential direction on the inner peripheral surface thereof, and the outer diameter and inner diameter thereof are, for example, 19φ and 17φ, The thickness is, for example, 1.0 mm. The pitch D6 of the convex part 631 is 0.5 mm or more, for example.

  The light irradiated by the LED light emitting units 20 and 30 is incident from both end faces of the saddle member 610a. Of the light incident on the saddle member 610a, the light that collides with the flat surface 611c and the curved surface 611d on the outer peripheral surface at an angle equal to or less than the above critical angle is repeatedly reflected by the flat surface 611c and the curved surface 611d of the saddle member 610a. It advances in the member 610a. On the other hand, the light colliding with the taper surfaces 611a and 611b is refracted by the taper surfaces 611a and 611b and emitted to the reflecting member 620a, and part of the light is reflected by the taper surfaces 611a and 611b and is reflected in FIG. Proceed in the direction of arrow A.

  The light emitted to the reflecting member 620a is totally reflected on the surface of the reflecting member 620a, refracts on the flat surface 611c of the saddle member 610a, and enters the saddle member 610a again. The light incident on the saddle member 610a again is emitted from the curved surface 611d of the saddle member 610a or travels in the saddle member 610a.

  Further, the light traveling in the direction of arrow A in FIG. 6B exits from the curved member 610a curved surface 611d, collides with the convex portion 631 of the tubular diffusion lens 630, and diffuses. The diffused light is emitted from the outer peripheral surface of the tubular diffusing lens 630 to the outside.

  The progress of light incident from both end faces of the saddle member 610b is the same as that of light incident from both end faces of the saddle member 610a except that it travels in the direction of arrow B in FIG. Is omitted.

  By repeating the above mechanism throughout the entire length of the light guide body 600, the light emitted from the LED light emitting units 20 and 30 is uniformly scattered on the outer peripheral surface of the light guide body 600. The outer peripheral surface of 600 emits light uniformly.

  According to the above configuration, the light guide 600 is attached to each plane of the pair of light-transmitting saddle members 610a and 610b and the saddle members 610a and 610b that are irradiated with light from both end surfaces thereof. 610a and 610b are arranged outside the pair of saddle members 610a and 610b so as to cover the whole of the pair of reflective members 620a and 620b and the pair of saddle members 610a and 610b that reflect the light emitted from each plane. And a tubular diffusing lens 630 that diffuses light emitted from the outer peripheral curved surfaces of the pair of saddle-shaped members 610a and 610b, thereby realizing uniform surface light emission on a predetermined surface of the light guide 400 and reducing the manufacturing cost. Versatility can be improved.

  8A and 8B are diagrams showing another modification of the light guide 100 in FIG. 2, in which FIG. 8A is a radial cross-sectional view, and FIG. 8B is a longitudinal cross-sectional view. The light guide shown in FIG. 8 uses three light transmissive cylindrical members and three reflecting members shown in FIG. 4 to fix them, and the other structure is the same as that of the light guide shown in FIG. Since it is basically the same, the description thereof will be omitted, and different parts will be described below.

  8A and 8B, the light guide 800 includes three light-transmissive long members 810a, 810b, and 810c that are irradiated with light from both end surfaces thereof, and the long members 810a to 810c. Reflective members 820a, 820b, and 820c that are attached to the outer peripheral surfaces and reflect light emitted from the outer peripheral surfaces of the long members 810a to 810c, and are attached to the outer peripheral surfaces of the reflective members 820a to 820c, and the reflective members 820a to 820c are attached. A tubular diffusion lens that is disposed outside the long members 810a to 810c so as to cover the fixing member 840 to be fixed and the long members 810a to 810c, and diffuses light emitted from the outer peripheral surfaces of the long members 810a to 810c. 830.

  The fixing member 840 includes R6.25 arc-shaped portions 840a, 840b, and 840c, and connecting portions 840a ′, 840b ′, and 840c ′ that connect the outer peripheral surfaces of a pair of arc-shaped portions adjacent to each other among the arc-shaped portions 840a to 840c. Have Each of the arc-shaped portions 840a to 840c has a thickness of 0.3 mm, for example.

  The long member 810a is a solid member having a substantially circular cross section, and has a length of, for example, 1000 mm and an outer diameter of, for example, 12.5φ. The long members 810a to 810 are made of, for example, an acrylic resin having high transparency. The long member 410 may be made of an acrylic transparent resin containing particles such as beads.

  The outer diameter and inner diameter of the tubular diffusion lens 630 are, for example, 32φ and 30φ, and the thickness is, for example, 1.0 mm.

  According to the said structure, the light guide 800 is attached to each outer peripheral surface of three light transmissive elongate member 810a, 810b, 810c irradiated with light from the both end surfaces, and elongate member 810a-810c, Reflective members 820a, 820b, and 820c that reflect light emitted from the outer peripheral surfaces of the long members 810a to 810c; a fixing member 840 that is attached to the outer peripheral surfaces of the reflective members 820a to 820c and fixes the reflective members 820a to 820c; Since it includes a tubular diffusing lens 830 that is disposed outside the long members 810a to 810c so as to cover the entire long members 810a to 810c and diffuses light emitted from the outer peripheral surfaces of the long members 810a to 810c. In addition to realizing uniform surface light emission of the entire light body 400, the manufacturing cost can be reduced and versatility can be improved. In addition, since the light guide 800 includes three light transmissive cylindrical members, the luminance can be increased as compared with the light guide including one cylindrical member.

  FIG. 9 is a diagram schematically showing a configuration of a light guide according to the second embodiment of the present invention, where (a) is a sectional view in the radial direction, and (b) is a sectional view in the longitudinal direction. It is.

  9 (a) and 9 (b), the light guide 850 is disposed in a light-transmitting hollow member 851 that is irradiated with light from both end surfaces thereof, and the internal space of the hollow member 851, and light is transmitted from one surface thereof. And a tubular diffusing lens 853 that is disposed outside the hollow member 851 so as to cover the entire hollow member 851 and diffuses light emitted from the outer peripheral surface of the hollow member 851. The hollow member 851, the optical fiber member 852, and the tubular diffusion lens 853 are arranged substantially coaxially.

  The optical fiber member 852 is formed over the entire area in the longitudinal direction of the acrylic resin core member 854 and the core member 854, and the core member 854 is within a predetermined angle range (angle β in FIG. 4B). And a covering member 856 that is disposed so as to cover the entire core member 854 and diffuses light emitted from the outer peripheral surface of the core member 854. The outer diameter of the optical fiber member 852 is, for example, 6.5 to 14.0 mm. The core member 854 is made of, for example, acrylic resin, and the reflection member 855 is made of, for example, fluorine resin. By irradiating the optical fiber member 852 with light from the LED light emitting unit 20, the optical fiber member 852 emits light in the direction of the arrow in the figure.

  According to the present embodiment, a light-transmitting hollow member 851 that is irradiated with light from both end surfaces thereof, and an optical fiber member 852 that is disposed in the internal space of the hollow member 851 and is irradiated with light from one surface thereof. A tubular diffusing lens 853 that is disposed outside the hollow member 851 so as to cover the entire hollow member 851 and diffuses light emitted from the outer peripheral surface of the hollow member 851, and the optical fiber member 852 is connected to the LED light emitting unit 20. Since the surface light is emitted in a predetermined direction when irradiated with light, the entire light guide 850 can emit light and the luminance in the predetermined direction can be increased by the surface light emission of the optical fiber member 852.

  In the present embodiment, the optical fiber member 852 is irradiated with light from the LED light emitting unit 20, but the present invention is not limited to this, and even if light is irradiated from another light emitting unit different from the LED light emitting unit 20. Good.

It is a perspective view which shows schematically the structure of a light guide light-emitting unit provided with the light guide which concerns on embodiment of this invention. It is a figure which shows the structure of the light guide in FIG. 1, (a) is sectional drawing of radial direction, (b) is sectional drawing of a longitudinal direction. It is a partial expanded sectional view of the light guide body edge part in FIG. It is a figure which shows the modification of the light guide of FIG. 2, (a) is sectional drawing of radial direction, (b) is sectional drawing of a longitudinal direction. It is a partial expanded sectional view of the light guide body edge part in FIG. It is a figure which shows the other modification of the light guide of FIG. 2, (a) is sectional drawing of radial direction, (b) is sectional drawing of a longitudinal direction. It is a partial expanded sectional view of the light guide body edge part in FIG. It is a figure which shows the other modification of the light guide of FIG. 2, (a) is sectional drawing of radial direction, (b) is sectional drawing of a longitudinal direction. It is a figure which shows schematically the structure of the light guide which concerns on the 2nd Embodiment of this invention, (a) is sectional drawing of radial direction, (b) is sectional drawing of a longitudinal direction. It is a top view which shows schematically the structure of the conventional light-guide light-emitting unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Light-guide light-emitting unit 20, 30 LED light emission part 100 Long light guide 110 Light-transmitting hollow member 120 Tubular reflection member 130 Tubular diffuser lens

Claims (13)

  A light-transmitting tubular member that is irradiated with light from at least one end surface; and a tubular reflecting member that is disposed in an internal space of the light-transmitting tubular member and reflects light emitted from the inner peripheral surface of the light-transmitting tubular member; And a tubular diffusing lens disposed outside the light transmissive tubular member so as to cover the entire tubular member and diffusing light emitted from the outer peripheral surface of the light transmissive tubular member. body.   2. The light guide according to claim 1, wherein the light transmissive tubular member is an acrylic resin hollow member having a substantially circular cross section.   3. The light guide according to claim 1, wherein the light transmissive tubular member has a plurality of grooves provided at equal intervals along a circumferential direction on an inner peripheral surface thereof.   The light guide according to claim 3, wherein a pitch of the plurality of grooves is 1.5 to 2.76 mm.   5. The light guide according to claim 3, wherein the groove has a substantially V-shaped cross section and has two tapered surfaces inclined so as to approach each other.   The light guide according to claim 1, wherein the tubular diffusion lens has a plurality of convex portions provided at equal intervals along a circumferential direction on an inner peripheral surface thereof.   A light-transmitting long member that is irradiated with light from at least one end surface, and a light-transmitting long member that is attached so as to abut on a surface parallel to the longitudinal direction of the light-transmitting long member, and is emitted from the light-transmitting long member A long reflecting member that reflects light, and light that is disposed outside the light transmissive long member so as to cover the entire light transmissive long member and is emitted from the outer peripheral surface of the light transmissive long member And a tubular diffusion lens for diffusing light. The light transmissive elongate member is a solid member made of acrylic resin having a substantially circular cross section,
The light guide according to claim 7, wherein the long reflecting member is attached to a part of an outer peripheral surface of the light transmissive long member.   9. The light guide according to claim 8, wherein the light transmissive long member has a plurality of grooves provided at equal intervals along a circumferential direction on an outer peripheral surface in contact with the long reflective member. body.   The light guide according to claim 9, wherein a pitch of the plurality of grooves is 1.5 to 2.76 mm.   11. The light guide according to claim 9, wherein the groove has a substantially V-shaped cross section and has two tapered surfaces inclined so as to approach each other.   The light guide according to claim 7, wherein the tubular diffusion lens has a plurality of convex portions provided at equal intervals along a circumferential direction on an inner peripheral surface thereof.   13. A light guide light emitting unit comprising: the light guide according to claim 1; and an LED light emitting unit that emits light from at least one end face of the light guide.

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