JP5284312B2 - Light guide plate and lighting device - Google Patents

Description

  The present invention relates to a wide variety of light guide plates in which an exit surface having a shape different from an incident surface is formed, and an illumination device provided with the light guide plate.

  Conventionally, by providing convex or concave dot portions on the front and back portions of the light guide plate in parallel with the incident end surface portion at a predetermined interval, a bright and uniform brightness can be obtained, and moire and the like can be prevented, and the light guide plate. There is a configuration of a flat illumination device provided with a light plate (see, for example, Patent Document 1).

  A light guide plate formed with a microprism; a light introduction plate arranged along one side of the outer periphery of the light guide plate; and a light source unit arranged opposite to one end surface of the light introduction plate. In addition, the light source part is included in the outline of the light guide plate, and the waveform pitch direction of the microprism is formed as an acute angle with the optical axis of the light from the light source part, thereby generating bright lines and moire fringes on the light guide plate. There is a configuration of a surface illumination device to prevent (see, for example, Patent Document 2).

JP 2003-208810 A JP 2003-045212 A

  However, in the configuration as described above, for example, when the main surface of the light guide plate is bent or refracted, there is a problem in that light derived from the exit surface facing the entrance surface interferes to generate interference fringes. It was.

  Therefore, in view of the above technical problem, the present invention provides interference caused by interference of light derived from the exit surface facing the entrance surface even when the main surface of the light guide plate is bent or refracted, for example. It is an object of the present invention to provide a light guide plate that can suppress the generation of fringes and an illumination device that is provided with the light guide plate and that can derive uniform light.

To solve the problems described above, the light guide plate according to the present invention, there is provided a light guide plate for leading out the light from the exit surface facing the light incident from the incident surface formed in a planar shape on the entrance surface, the incident A display that is formed on a plane between the surface and the exit surface, and is formed on the main surface by a dot-like concave pattern and a linear concave pattern for deriving light as diffused light and displaying predetermined information and parts, and a curved surface that is refracted in bending or predetermined angle to a predetermined curvature in the direction of the main surface provided between the emission surface and the incident surface, the previous SL-emitting surface, and the incident surface It is formed in different shapes.

  In order to solve the above-described problem, the illumination device according to the present invention includes a main surface provided between the incident surface and the exit surface that is bent at a predetermined curvature or refracted at a predetermined angle, and the exit surface. Includes a light guide plate formed in a shape different from that of the incident surface, a light source adjacent to the light guide plate and allowing light to enter from the incident surface of the light guide plate, and a holding member that holds at least the light source. It is characterized by that.

  According to the light guide plate of the present invention, for example, even when the main surface of the light guide plate is bent or refracted, interference fringes are generated due to interference of light derived from the exit surface facing the entrance surface. Can be suppressed. Furthermore, according to the illuminating device which concerns on this invention, said light guide plate can be provided and uniform light can be derived | led-out.

It is a perspective view which shows the illuminating device which provided the light-guide plate which concerns on the 1st Embodiment of this invention, (a) is a perspective view which shows the illuminating device assembled integrally, (b) was decomposed | disassembled for every structure. It is a perspective view which shows an illuminating device. A light guide plate having a principal surface according to the first embodiment of the present invention bent to a predetermined curvature and led out from an exit surface having a predetermined shape and facing light incident from an incident surface is provided from one main surface side. (A) is a perspective view showing a light guide plate having an emission surface formed in a convex shape, (b) is a perspective view showing a light guide plate having an emission surface formed in a spherical shape, and (c) is a perspective view showing the light guide plate. It is a perspective view which shows the light-guide plate formed in the trapezoid trapezoid shape from which an output surface increases a cross-sectional area toward a front-end | tip. A light guide plate having a principal surface according to the first embodiment of the present invention bent to a predetermined curvature and led out from a light exit surface having a predetermined shape provided facing the light incident from the incident surface from the other main surface side 2A is a perspective view showing a light guide plate corresponding to each figure of FIG. 2, and FIG. 2B is a perspective view showing a light guide plate formed with a convex emission surface, and FIG. The perspective view which shows an optical plate, (c) is a perspective view which shows the light-guide plate formed in the trapezoid trapezoid shape from which an output surface increases a cross-sectional area toward a front-end | tip. The schematic diagram which shows from the side the light-guide plate which the main surface which concerns on the 1st Embodiment of this invention is bent by the predetermined | prescribed curvature, and guides the light which injected from the incident surface opposes and is derived | led-out from the output surface which consists of predetermined shapes 2 corresponds to each figure of FIG. 2, (a) is a schematic view showing a light guide plate integrally formed with a convex emission surface, and (b) is a spherical emission surface integrally formed. Schematic diagram showing the light guide plate, (c) is a schematic diagram showing a light guide plate integrally formed with a trapezoidal trapezoidal trapezoidal shape whose sectional area increases toward the tip, and (d) shows a convex output surface. The schematic diagram which shows the light-guide plate with which the provided front-end | tip part was joined to the base material part, (e) is the schematic diagram which shows the light-guide plate with which the front-end | tip part which provided the output surface which consists of spherical shapes was joined to the base material part, ( f) is based on the tip provided with an emission surface having a trapezoidal trapezoidal shape with a cross-sectional area increasing toward the tip. Parts is a schematic view showing a bonded light guide plate. It is a schematic diagram which shows from the side the light-guide plate which guides the light which injected from the incident surface from the output surface provided in opposition, (a) forms the output surface which concerns on the 1st Embodiment of this invention by convex shape The schematic diagram which shows the state in which the light was incident on the entrance plane of the made light guide plate, (b) is light on the entrance plane of the light guide plate in which the exit surface according to the first embodiment of the present invention is formed in a spherical shape. FIG. 4C is a schematic diagram showing an incident state, in which (c) shows light incident on an incident surface of a light guide plate formed in a trapezoidal trapezoidal shape in which the exit surface according to the first embodiment of the present invention has a cross-sectional area increasing toward the tip. (D) is a schematic diagram showing a state in which light is incident on an incident surface of a light guide plate having an emission surface formed in a planar shape as in the prior art, and (e) is a conventional diagram. It is a schematic diagram which shows the state in which light injected into the entrance plane of the light-guide plate in which the main surface is not bent. It is a schematic diagram which shows from the side the vicinity of the output surface of the light guide plate for deriving the light incident from the input surface from the output surface provided to face, (a) the output surface according to the first embodiment of the present invention Schematic diagram showing the vicinity of the exit surface of the light guide plate formed in a convex shape, (b) is the vicinity of the exit surface of the light guide plate formed in a spherical shape according to the first embodiment of the present invention FIG. 4C is a schematic diagram illustrating the vicinity of the light exit surface of the light guide plate formed in a trapezoidal trapezoidal shape in which the cross section of the light exit surface according to the first embodiment of the present invention increases toward the tip. . It is a schematic diagram which shows the state by which the concave or convex pattern which concerns on the 1st Embodiment of this invention was formed in the main surface of a light-guide plate, and predetermined information was represented on this main surface, (a) is a light-guide plate Schematic diagram showing a state in which a plurality of concave patterns made up of dots are formed on the main surface of the, and the letter "A" is represented by capital letters of the alphabet, (b) is made up of dots on the main surface of the light guide plate A schematic diagram showing a state in which a concave pattern composed of a plurality of concave patterns and a linear shape surrounding the plurality of concave patterns is formed, and the letter “E” is expressed in capital letters of the alphabet, (c) is a linear pattern The schematic diagram which shows the state where the outline of the letter "L" was represented by the capital letter of the alphabet by the concave pattern which consists of, (d) is the state where the letter "L" was represented by the capital letter of the alphabet by the pattern which consists of concave It is a schematic diagram which shows. It is a perspective view which shows the state which is illuminating an exhibit with the illuminating device which provided the light-guide plate which concerns on the 2nd Embodiment of this invention.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a light guide plate of the present invention and a lighting device provided with the light guide plate will be described with reference to the drawings. In addition, the light guide plate of this invention and the illuminating device provided with this light guide plate are not limited to the following description, In the range which does not deviate from the summary of this invention, it can change suitably.

  Moreover, in the following description, the illuminating device 1 which provided the light-guide plate which concerns on the 1st Embodiment of this invention first is demonstrated, referring FIG. 1 thru | or FIG. Next, the illuminating device 2 provided with the light guide plate according to the second embodiment of the present invention will be described with reference to FIG. Furthermore, the manufacturing method of the light-guide plate each provided in the illuminating device 1 and the illuminating device 2 which concern on the 1st and 2nd embodiment of this invention is demonstrated. Finally, the structure and main functions and effects of the light guide plate according to the first and second embodiments of the present invention and the illumination device 1 and the illumination device 2 provided with the light guide plate will be described for each claim.

[First Embodiment]
Hereinafter, the illuminating device 1 provided with the light guide plate according to the first embodiment of the present invention will be specifically described with reference to FIGS. 1 to 7.

  The illuminating device 1 of 1st Embodiment is comprised from the light-guide plate 10, the light source 20, and the holding member 30, as shown, for example in FIG. Such an illuminating device 1 is used, for example, for illuminating an exhibit at an exhibition hall. Hereinafter, each structure of the illuminating device 1 is demonstrated in order.

  The light guide plate 10 constituting the illumination device 1 of the first embodiment guides light incident from the incident surface 10A shown in FIG. 1 from an output surface 10B provided to face the incident surface 10A. Here, the main surface of the light guide plate 10 is provided between the entrance surface 10A and the exit surface 10B facing the entrance surface 10A, and is bent at a predetermined curvature or refracted at a predetermined angle. Further, the exit surface 10B of the light guide plate 10 is formed in a shape different from the entrance surface 10A formed in a planar shape. Hereinafter, the configuration of the light guide plate 10 and the like will be described with reference to FIGS. 1 to 7. Specifically, first, the configuration of the light guide plate 10 and the like will be described with reference to FIGS. 2 and 3, and then the method of forming the light guide plate 10 and the like will be described with reference to FIG. The optical characteristics of the light guide plate 10 and the like will be described with reference to FIG. 7, and finally the display unit provided on the light guide plate 10 and the like will be described with reference to FIG.

  Regarding the configuration of the light guide plate 10 and the like, the material of the light guide plate 10 shown in FIG. 1 is made of, for example, a transparent acrylic resin. The light guide plate 10 is not limited to a transparent acrylic resin, and an acrylic resin colored in a predetermined color may be used. Further, as the light guide plate 10, for example, a resin plate to which a particulate diffusion member that emits diffused light when irradiated with light in the visible range may be used. Similarly, for the light guide plate 10, for example, a resin plate coated or added with a fluorescent agent that emits fluorescence when irradiated with light in the ultraviolet region or visible region may be used. Further, the light guide plate 10 is applied with a silicone coating agent or glass coating agent (not shown) having functions such as waterproof, antifouling, and dustproof, or is shown with functions such as waterproof, antifouling, and dustproof. A transparent resin may be coated.

  Further, regarding the configuration of the light guide plate 10 and the like, the shape of the light guide plate 10 shown in FIG. 1 is such that the main surface provided between the entrance surface 10A and the exit surface 10B is bent at a predetermined curvature or refracted at a predetermined angle. It consists of a plate. Specifically, as shown in FIGS. 2 and 3, for example, the shape of the light guide plate 11 corresponding to a modified example of the light guide plate 10 has a lower one main surface 11 </ b> C and a lower other main surface 11 </ b> D formed to face each other. The upper one main surface 11E and the upper other main surface 11F formed to face each other are formed in an L shape via a bent portion 11K bent at a predetermined angle. As will be described later, a concave or convex pattern that guides light as diffused light is formed on the display portion 11L provided at the center of the upper main surface 11F of the light guide plate 11, for example. The letter “A” is shown. Further, a lower right side surface 11G and a lower left side surface 11H are formed to face each other on the side surfaces corresponding to the thickness portions of the lower one main surface 11C and the lower other main surface 11D. Further, an upper right side surface 11I and an upper left side surface 11J are formed to face each other on the side surfaces corresponding to the thickness portions of the upper one main surface 11E and the upper other main surface 11F.

  Similarly, regarding the configuration of the light guide plate 10 and the like, the shape of the light guide plate 10 shown in FIG. 1 is different between the entrance surface 10A and the exit surface 10B. Specifically, as shown in FIG. 1, the incident surface 10A of the light guide plate 10 is formed in a flat shape, and the output surface 10B of the light guide plate 10 is formed in a trapezoidal trapezoidal shape whose cross-sectional area decreases toward the tip. ing. Further, as shown in FIGS. 2 and 3, for example, the emission surface 11 </ b> B of the light guide plate 11 corresponding to a modification of the light guide plate 10 is formed in a convex shape. Similarly, as shown in FIGS. 2 and 3, for example, the emission surface 12 </ b> B of the light guide plate 12 corresponding to a modification of the light guide plate 10 is formed in a spherical shape. Similarly, as shown in FIGS. 2 and 3, for example, the emission surface 13 </ b> B of the light guide plate 13 corresponding to a modification of the light guide plate 10 is formed in a trapezoidal trapezoidal shape whose cross-sectional area increases toward the tip. The shape of the exit surface 10B of the light guide plate 10 may be, for example, a concave shape, a truncated cone shape, a shape in which the cross-sectional area decreases, increases, decreases or increases toward the tip, or a shape in which they are combined. .

  Regarding the method of forming the light guide plate 10 and the like, the light guide plate 10 shown in FIG. 1 and the light guide plate 11 to the light guide plate 13 shown in FIGS. It is integrally formed by processing or cutting. Specifically, in the light guide plate 11 to the light guide plate 13 shown in FIGS. 4A to 4C, in the molding process, a shape reflecting the outer shape of the light guide plate to be molded is formed inside the mold. For example, by injecting a softened resin that has been heated and softened into a mold mounted on an injection molding machine, and then cooling the resin, each light guide plate has a convex shape, a spherical shape, and a tip, respectively. The light guide plate 11 to the light guide plate 13 reflecting the trapezoidal trapezoidal shape with an increasing cross-sectional area are formed. Moreover, in the light guide plate 11 to the light guide plate 13 shown in FIGS. 4A to 4C, in the cutting process, the cutting surface is urged against the exit surface of each light guide plate to cut each light guide plate. The light guide plate 11 to the light guide plate 13 reflecting the convex shape, the spherical shape, and the trapezoidal trapezoidal shape whose cross-sectional area increases toward the tip are formed on the emission surface.

  In addition, regarding the method of forming the light guide plate 10 and the like, the light guide plates 14 to 16 shown in FIGS. 4D to 4F are each formed by joining the tip portion provided with the emission surface to the base material portion. ing. Specifically, the light guide plate 14 shown in FIG. 4 (d) is similar to the outer shape of the light guide plate 11, but the tip portion 14N provided with an exit surface having a convex shape is an L-shaped base material portion 14M. It is joined and formed. Similarly, the light guide plate 15 shown in FIG. 4 (e) is similar to the outer shape of the light guide plate 12, but the tip portion 15N provided with a spherical emission surface is joined to the L-shaped base portion 15M. Has been formed. Similarly, the light guide plate 16 shown in FIG. 4 (f) is similar to the outer shape of the light guide plate 13, but has a tip portion 16N provided with a light emitting surface having a trapezoidal trapezoidal shape whose cross-sectional area increases toward the tip. It is formed by being joined to the L-shaped base part 16M. Further, the bonding between the tip portion provided with the emission surface and the base material portion uses an adhesive having a low hygroscopic property and transparent at least in the visible wavelength range. In addition, you may use the method of crimping | bonding, after heating a front-end | tip part and a base-material part, respectively, and joining the front-end | tip part and base material part which provided the output surface.

  Regarding the optical characteristics of the light guide plate 10 and the like, each of FIGS. 5 and 6 schematically shows a side surface of the light guide plate that guides the light incident from the incident surface from the exit surface provided to face the light. Here, FIGS. 5A to 5C show states in which the light L1 is incident from the respective incident surfaces of the light guide plate 11 to the light guide plate 13 according to the first embodiment of the present invention. . On the other hand, FIG. 5D shows a state in which the light L1 is incident from the incident surface 100A of the light guide plate 100 in which the incident surface 100A and the emission surface 100B are formed in a planar shape as in the prior art. FIG. 5E shows the light L1 from the incident surface 110A of the light guide plate 110 that is formed in a linear plate shape in which the one main surface 110P and the other main surface 110Q that face each other are not bent or refracted as in the conventional case. Indicates the incident state. In order to facilitate understanding of the invention, the light L1 incident on each light guide plate and the light L2 or light L3 incident on each light guide plate shown in each drawing of FIG. Ignoring the corners and keeping the number of rays at three.

  Regarding the optical characteristics of the light guide plate 10 and the like, when a light emitting diode is used for the light source 20 shown in FIG. 1, for example, the light incident on each light guide plate has a predetermined divergence angle. Therefore, for example, in the light guide plate 11 shown in FIGS. 2 and 3, most of the light incident from the incident surface 11A of the light guide plate 11 is subjected to multiple reflection between the lower one main surface 11C and the lower other main surface 11D. Then, after multiple reflection between the upper one main surface 11E and the upper other main surface 11F via the bent portion 10K bent at a predetermined angle, the light is derived from the emission surface 11B. In addition, a part of the light incident from the incident surface 11A of the light guide plate 11 is reflected on the upper right side through a bent portion 10K bent at a predetermined angle while performing multiple reflection between the lower right side surface 11G and the lower left side surface 11H. After multiple reflection between the surface 11I and the upper left side surface 11J, the light is derived from the emission surface 11B. Similarly, a part of the light incident from the incident surface 11A of the light guide plate 11 is led out from the output surface 11B after being reflected between each main surface and each side surface.

  Here, regarding the optical characteristics of the light guide plate 10 and the like, in the case of the conventional unbent light guide plate 110 illustrated in FIG. 5E, each light beam related to the light L3 incident from the incident surface 110 </ b> A is transmitted through the light guide plate 110. Since the light path lengths of the light beams related to the light L3 inside the light guide plate 110 are equal and in phase, the light beams emitted from the emission surface 110B do not interfere with each other. On the other hand, in the case of the conventional bent light guide plate 100 shown in FIG. 5D, each light beam related to the light L <b> 2 incident on the inside of the light guide plate 100 from the incident surface 100 </ b> A In the process of multiple reflection between the surface 100C and the lower other main surface 100D and between the upper one main surface 100E and the upper other main surface 100F, the phase shifts because the optical path lengths of the light beams related to the light L2 are different. End up. Therefore, the light derived from the exit surface 100B of the light guide plate 100 interferes with each other. Specifically, in the conventional light guide plate 100, the optical path length of each light beam from the incident surface 100A to the upper main surface 100E is different, for example, the right light beam in the figure among the three light beams is relatively long, and The left ray in the figure is relatively short. Accordingly, in the conventional light guide plate 100, the phase of each light beam related to the light L2 reflected by the upper main surface 100E of the light guide plate 100 is shifted, so that the light derived from the output surface 100B of the light guide plate 100 interferes. Interference fringes.

  Therefore, regarding the optical characteristics of the light guide plate 10 and the like, the light output from each light guide plate is similar to the light guide plates 11 to 13 according to the first embodiment of the present invention shown in FIGS. The surface is formed into, for example, a convex shape, a spherical shape, and a trapezoidal trapezoidal shape with a cross-sectional area increasing toward the tip. By adopting such a shape, the light derived from the light exit surfaces of the light guide plate 11 to the light guide plate 13 is condensed, diffused, diffusely reflected, and the like, resulting from the interference of the light derived from each light exit surface. The occurrence of interference fringes is suppressed.

  Specifically, regarding the optical characteristics of the light guide plate 10 and the like, the light guide plate 11 according to the first embodiment of the present invention shown in FIG. 5A has an output surface 11B of the light guide plate 11 formed in a convex shape. ing. Accordingly, the light L2 incident from the inside of the light guide plate 11 to the inner wall of the emission surface 11B at an angle less than the critical angle is not totally reflected and is forward from the emission surface 11B as shown in FIG. 6A. It is derived after being condensed. In addition, the light L2 incident from the inside of the light guide plate 11 at an angle exceeding the critical angle with respect to the inner wall of the output surface 11B is totally reflected from the inner wall of the output surface 11B to the inside of the light guide plate 11 to be light guide plate. After being reflected inside 11 and having an angle less than the critical angle, the light is derived from the exit surface 11B. In addition, in the light guide plate 12 according to the first embodiment of the present invention shown in FIG. 5B, the emission surface 12B of the light guide plate 12 is formed in a spherical shape. Accordingly, the light L2 incident from the inside of the light guide plate 12 at an angle less than the critical angle with respect to the inner wall of the emission surface 12B is not totally reflected, but is totally reflected from the emission surface 12B as shown in FIG. 6B. It is derived by diffusing in the direction. The light L2 incident from the inside of the light guide plate 12 at an angle exceeding the critical angle with respect to the inner wall of the emission surface 12B is totally reflected from the inner wall of the emission surface 12B to the inside of the light guide plate 12. After being reflected inside 11 and having an angle less than the critical angle, the light is derived from the exit surface 11B. Furthermore, the light guide plate 13 according to the first embodiment of the present invention shown in FIG. 5C is formed in a trapezoidal trapezoidal shape in which the exit surface 13B of the light guide plate 13 increases in cross-sectional area toward the tip. . Therefore, the light L2 derived from the exit surface 13B of the light guide plate 13 is emitted at a wide angle from the first exit surface 13B ′ having a larger surface area than the entrance surface 13A as shown in FIG. 6C, and the exit surface 13B. The light L2 ′ irradiated to the second emission surface 13B ″ in the peripheral portion of the light is diffused and derived.

  With respect to the display unit provided on the light guide plate 10 and the like, in each drawing of FIG. 7, a display unit 10 </ b> L in which a concave or convex pattern that guides light as diffused light is provided on the upper main surface 10 </ b> F of the light guide plate 10. A state in which predetermined information is formed on the main surface is schematically illustrated. Here, the predetermined information includes, for example, a character, a figure, a trade name, a character, or a symbol, and may be a combination thereof. Specifically, FIG. 7A shows a case where a plurality of concave patterns 41 made of dots are used in the display portion 10L of the upper other main surface 10F of the light guide plate 10, and the letter “A” is capitalized in alphabet. The represented state is shown in a schematic diagram. FIG. 7B shows a plurality of concave patterns 41 having a dot shape and a concave pattern having a linear shape surrounding the plurality of concave patterns in the display portion 10L of the upper other main surface 10F of the light guide plate 10. 42 is a schematic diagram showing a state where the letter “E” is represented by capital letters of the alphabet. Similarly, FIG. 7C schematically illustrates a state in which the contour of the letter “L” is expressed in uppercase letters of the alphabet using the concave pattern 42 in the display portion 10L of the upper other main surface 10F of the light guide plate 10. It is shown in the figure. That is, in FIG. 7C, only the outline of the portion represented by “L” is formed in a concave shape. Similarly, FIG. 7D is a schematic diagram showing a state in which the letter “L” is represented by capital letters of the alphabet using the concave pattern 43 in the display portion 10L of the upper other main surface 10F of the light guide plate 10. Is shown. That is, in FIG. 7D, all of the portion represented as “L” is formed in a concave shape.

  In addition, regarding the display unit provided on the light guide plate 10 and the like, most of the diffused light generated in the display unit 10L of the upper other main surface 10F of the light guide plate 10 described above, for example, is provided facing the upper other main surface 10F. It is derived from the upper one principal surface 10E. Further, the concave pattern described above may be any one of ultrasonic processing, heating processing, cutting processing, laser processing, and molding processing in the display portion 10L of the upper other main surface 10F of the light guide plate 10 or their processing. It is formed by combining processing. Similarly, the convex pattern mentioned above is formed in the display part 10L of the upper one principal surface 10E of the light guide plate 10, for example, by any one of molding processing and silk printing processing, or a combination of these processing. . Moreover, you may express so that predetermined information may be emphasized by setting it as the structure which colors the display part 10L of the main surface of the light-guide plate 10 in which the concave or convex pattern was formed. Specifically, for example, in the display portion 10L shown in FIG. 7B, only the pattern 42 is colored black or the like, thereby emphasizing the uppercase letter “E” formed by the concave pattern 41. It may be expressed as

  As shown in FIG. 1, the light source 20 constituting the illumination device 1 of the first embodiment makes light incident from the incident surface of the light guide plate 10 adjacent to the light guide plate 10. Hereinafter, the configuration of the light source 20 will be described with reference to FIG. The light source 20 includes, for example, a light emitting diode (LED) that emits white light. The light source 20 is not limited to a white LED, for example, an LED formed of any one of white, red, orange, yellow, green, blue, indigo, and purple, or a combination of these colors. You may comprise. Moreover, you may comprise the light source 20 by LED which emits the light of an ultraviolet region, for example. Similarly, the light source 20 may be composed of, for example, an organic light emitting diode, a fluorescent tube, a cold cathode tube, or a neon tube. A substrate for mounting the light source 20 in a predetermined arrangement may be provided. As the substrate, for example, a light metal plate having a certain strength, a metal plate using copper excellent in heat dissipation, or a glass epoxy substrate excellent in workability is used. The light source 20 emits light with a predetermined amount of light by driving power supplied from the outside such as an outlet or a generator, or driving power supplied from a storage battery built in the lighting device 1.

  The holding member 30 which comprises the illuminating device 1 of 1st Embodiment hold | maintains the light source 20 at least, as shown in FIG. Hereinafter, the configuration of the holding member 30 will be described with reference to FIG. The holding member 30 is made of aluminum, for example, and is formed in a predetermined shape. Specifically, the holding member 30 engages and holds at least the light source 20 on an inner wall 30A formed in a substantially U-shape. In FIG. 1, the light source 20 and the light guide plate 10 are integrally engaged and held on the inner wall 30 </ b> A of the holding member 30. Further, for example, an adhesive may be applied to the inner wall 30 </ b> A of the holding member 30, and the light source 20 and the light guide plate 10 may be bonded and fixed to the holding member 30. Similarly, for example, after forming a screw groove in the holding member 30, the light source 20 and the light guide plate 10 may be screwed to the holding member 30 using screws (not shown). Further, on both ends of the holding member 30, mounting tables 30B for mounting the lighting device 1 on a desk in a stable state are formed.

  As mentioned above, according to the illuminating device 1 which concerns on 1st Embodiment, the output surface 11B of this light-guide plate 11 is formed in convex shape like the light-guide plate 11 shown, for example to Fig.5 (a). With such a configuration, the light L2 incident from the inside of the light guide plate 11 at an angle less than the critical angle with respect to the inner wall of the exit surface 11B is not totally reflected, as shown in FIG. The light can be derived in a state where light is condensed forward. Further, the light L2 incident from the inside of the light guide plate 11 at an angle exceeding the critical angle with respect to the inner wall of the output surface 11B is totally reflected from the inner wall of the output surface 11B to the inside of the light guide plate 11, and the light guide plate. 11 can be derived from the exit surface 11B after being reflected within 11 and having an angle less than the critical angle. Therefore, it can suppress that the light derived | led-out from the output surface 11B of the light-guide plate 11 interferes, and an interference fringe generate | occur | produces, and can improve the design property of the light-guide plate 11. FIG.

  Moreover, according to the illuminating device 1 which concerns on 1st Embodiment, the output surface 12B of this light-guide plate 12 is formed in spherical shape like the light-guide plate 12 shown, for example in FIG.5 (b). With such a configuration, the light L2 incident from the inside of the light guide plate 12 at an angle less than the critical angle with respect to the inner wall of the emission surface 12B is not totally reflected, as shown in FIG. Can be derived in a diffused state in all directions. The light L2 incident from the inside of the light guide plate 12 at an angle exceeding the critical angle with respect to the inner wall of the output surface 12B is totally reflected from the inner wall of the output surface 12B to the inside of the light guide plate 12, and the light guide plate 11 can be derived from the exit surface 11B after being reflected within 11 and having an angle less than the critical angle. Therefore, it can suppress that the light guide | induced from the output surface 12B of the light-guide plate 12 interferes, and an interference fringe generate | occur | produces, and can improve the design property of the light-guide plate 12. FIG. Further, for example, by optimizing specifications such as the radius of curvature of the exit surface 12B of the light guide plate 12 and changing the shape of the exit surface 12B, the light distribution of light derived from the exit surface 12B can be expanded. .

  Similarly, according to the illuminating device 1 which concerns on 1st Embodiment, the cross-sectional area increased toward the front-end | tip for the output surface 13B of this light-guide plate 13, like the light-guide plate 13 shown, for example in FIG.5 (c). By forming the trapezoidal trapezoidal shape, the light L2 derived from the emission surface 13B is emitted from the first emission surface 13B ′ having a surface area larger than that of the incidence surface 13A as shown in FIG. The light L2 ′ irradiated on the second emission surface 13B ″ in the peripheral portion of the surface 13B can be derived after being irregularly reflected. Therefore, it can suppress that the light guide | induced from the output surface 13B of the light-guide plate 13 interferes, and an interference fringe generate | occur | produces, and the design property of the light-guide plate 13 can be improved.

  Moreover, according to the illuminating device 1 which concerns on 1st Embodiment, a concave or convex pattern shown, for example in FIG. 7 is formed in the display part 10L of the main surface of the light-guide plate 10 shown in FIG. , A predetermined information consisting of a figure, a trade name, a character, or a symbol. Therefore, the design of the light guide plate 10 can be improved, and predetermined information can be easily stored for the user who has viewed the light guide plate 10.

  Similarly, according to the illuminating device 1 which concerns on 1st Embodiment, the output surface 10B of the light-guide plate 10 is formed in the shape different from the entrance surface 10A formed in planar shape, and the concave shape which guide | induces light as diffused light Alternatively, a convex pattern is formed on the display unit 10 </ b> L provided on any main surface of the light guide plate 10. With such a configuration, the illumination device 1 can use the light from the light source 20 as illumination light in which interference fringes are suppressed and display light representing predetermined information. That is, it is possible to suppress the interference of light derived from the exit surface 10B of the light guide plate 10 and the generation of interference fringes, and to make it easier for a user who has viewed the light guide plate 10 to store predetermined information. The design of the light guide plate 10 can be improved. Similarly, according to the illuminating device 1 which concerns on 1st Embodiment, it is made to derive from the output surface 11B of this light-guide plate 11 by changing the angle of the bending part 10K of the light-guide plate 11 shown to Fig.2 (a), for example. The light distribution can be varied.

[Second Embodiment]
Hereinafter, the illuminating device 2 of the 2nd Embodiment of this invention is demonstrated concretely, referring FIG.

  The illumination device 2 according to the second embodiment of the present invention is characterized in that the illumination device 2 is suspended and the light derived from the emission surface 40B of the light guide plate 40 is irradiated downward. ing. Other configurations according to the second embodiment are the same as the configurations described in the first embodiment. Therefore, in the second embodiment, a configuration different from the first embodiment will be mainly described.

  The light guide plate 40 and the light source 50 constituting the illumination device 2 of the second embodiment have the same specifications as the light guide plate 10 and the light source 20 of the illumination device 1 except for the outer shape. Moreover, the holding member 60 which comprises the illuminating device 2 of 2nd Embodiment consists of a pair, and the light source 50 and the light-guide plate 40 are each engaged with the inner wall 60A of the holding member 60, and are hold | maintained. Further, the holding member 60 has an engagement hole 60B formed of a predetermined through hole. Here, for example, a metal engagement member P formed by bending a plurality of places is engaged with the engagement hole 60 </ b> B of the holding member 60. The engaging member P is connected to a metal hanging member Q having a U-shape provided above the exhibit S, for example. The suspension member Q is fixed to, for example, a plate-like mounting table R installed on the floor. A predetermined exhibit S is placed on the mounting table R. Here, the light derived from the emission surface 40B of the light guide plate 40 provided in the illumination device 2 is irradiated to the exhibit S placed on the mounting table R. Further, the predetermined information displayed on, for example, the display unit 40L of the upper other main surface 10F of the light guide plate 40 provided in the lighting device 2 is related to the exhibit S, for example.

  As mentioned above, according to the illuminating device 2 which concerns on 2nd Embodiment, the effect similar to the illuminating device 1 which concerns on 1st Embodiment mentioned above can be acquired. Furthermore, according to the lighting device 2 according to the second embodiment, even if the light guide plate 40 provided in the lighting device 2 is relatively large as shown in FIG. Since it is made of resin, the lighting device 2 can be easily installed on top of the exhibit S at an exhibition hall or the like, and information related to the exhibit S is represented on the display unit 40L on the main surface of the light guide plate 40. Above, the illumination light which suppressed the interference fringe can be irradiated to the exhibit S from the output surface 40B of the light guide plate 40.

  Furthermore, the manufacturing method of the light-guide plate 10 each provided in the illuminating device 1 and the illuminating device 2 which concern on the 1st and 2nd embodiment of this invention is demonstrated concretely.

  For example, ultrasonic processing, heating processing, cutting processing, laser processing, molding processing, and silk printing processing can be used as the method for manufacturing the light guide plate 10. Hereinafter, each manufacturing method will be described. In the ultrasonic processing, the main surface of the light guide plate 10 is partially melted by using the ultrasonic vibration of the ultrasonic processing horn brought into contact with the main surface of the light guide plate 10 to form a concave shape on the main surface. The pattern is formed. In the heating process, the main surface of the light guide plate 10 is partially melted using the heat of the processing tool brought into contact with the main surface of the light guide plate 10 to form a concave pattern on the main surface. . Similarly, in the cutting process, the main surface of the light guide plate 10 is partially scraped off by using a cutting tool that is rotated or biased while being in contact with the main surface of the light guide plate 10, thereby forming a concave pattern on the main surface. Form. Similarly, in the laser processing, a concave pattern is formed on the main surface by partially melting the main surface of the light guide plate 10 using the heat of the laser beam condensed on the main surface of the light guide plate 10. To do. Similarly, in the molding process, a shape reflecting the outer shape of the light guide plate 10 to be molded is formed inside the mold, and, for example, a resin softened by heating is injected into the mold mounted on the injection molding machine. Then, by cooling the resin, a concave pattern, a convex pattern, or a concave and convex pattern is formed on the main surface of the light guide plate 10.

  Further, regarding the method of manufacturing the light guide plate 10, in silk printing, a plate having predetermined holes is brought into contact with the main surface of the light guide plate 10, and a curable resin is attached to the main surface through the holes. Then, the main surface is partially covered with a resin to form a convex pattern on the main surface. Further, for example, a particulate diffusion member that emits diffused light may be added to the resin that is the base material of the light guide plate 10 used for molding or silk printing. Similarly, for example, a resin that is a base material of the light guide plate 10 that performs the above-described ultrasonic processing, heating processing, cutting processing, or laser processing may be added with a particulate diffusion member that emits diffused light. . The light guide plate 10 may be formed by combining the ultrasonic processing, heating processing, cutting processing, laser processing, molding processing, and silk printing processing described above. Specifically, for example, after forming only the outer shape of the light guide plate 10 by molding, a concave pattern may be formed on the main surface of the light guide plate 10 by, for example, ultrasonic processing. Similarly, after forming only the outer shape of the light guide plate 10 by molding, for example, a convex pattern may be formed on the main surface of the light guide plate 10 by silk printing, for example.

  Finally, the structure and main functions and effects of the light guide plate according to the first and second embodiments of the present invention described above, the illumination device 1 provided with the light guide plate, and the illumination device 2 will be described for each claim. .

The light guide plate 10 to the light guide plate 16 or the light guide plate 40 according to claim 1 is a light guide plate that guides light incident from an incident surface formed in a planar shape from an output surface opposed to the incident surface. Formed on the plane between the incident surface and the exit surface, and is formed on the main surface by a point-like concave pattern and a linear concave pattern for deriving light as diffused light, and predetermined information is expressed. and a display unit are provided with a curved surface that is refracted in bending or predetermined angle to a predetermined curvature in the main surface direction is provided between the emission surface and the incident surface, the previous SL exit surface, the incident surface It is characterized by being formed in a different shape.

  According to such a configuration of claim 1, the main surface provided between the entrance surface and the exit surface of the light guide plate 10 to the light guide plate 16 or the light guide plate 40 is bent at a predetermined curvature or refracted at a predetermined angle. Even so, the light emitted from the light exit surface can be condensed or diffused by forming the light exit surface of each light guide plate in a shape different from that of the light entrance surface. Therefore, it can suppress that the light guide | induced from the output surface of each light-guide plate interferes, and an interference fringe generate | occur | produces, and can improve the design property of each light-guide plate. Further, by adjusting the angle of the bent portion of the light guide plate 10 to the light guide plate 16 or the light guide plate 40, it is possible to optimize the light distribution of the light derived from the exit surface of the light guide plate.

The light guide plate 10 to the light guide plate 16 or the light guide plate 40 according to claim 2 is dependent on claim 1, and the exit surface is formed so that a cross-sectional area of the exit surface is once increased. And
The light guide plate 10 to the light guide plate 16 or the light guide plate 40 according to claim 3, formed dependent on claim 2, the cross section of the exit surface, circular, or trapezoidal cone shape formed integrally, or are joined It is characterized by being.

  According to such a configuration of claim 2, the light guide plate 10 to the light guide plate 16 or the light guide plate 40 can suppress interference fringes caused by interference of light derived from the exit surface of each light guide plate, In addition, it is possible to optimize the light distribution of light derived from the exit surface of each light guide plate according to the required specifications, and to further improve the design of each light guide plate.

In the construction of claim 2 or 3, such as this, for example, the light guide plate 12, the exit surface 12B of the light guide plate 12 as shown in FIG. 5 (b) by forming a spherical shape, from the light guide plate 12 The light L2 incident at an angle less than the critical angle with respect to the inner wall of the emission surface 12B is derived in a state of being diffused from the emission surface 12B in all directions as shown in FIG. 6B without being totally reflected. be able to. Further, the light L2 incident from the inside of the light guide plate 12 at an angle exceeding the critical angle with respect to the inner wall of the output surface 12B is totally reflected from the inner wall of the output surface 12B to the inside of the light guide plate 12, thereby 11 can be derived from the exit surface 11B after being reflected within 11 and having an angle less than the critical angle. Therefore, it can suppress that the light guide | induced from the output surface 12B of the light-guide plate 12 interferes, and an interference fringe generate | occur | produces, and can improve the design property of the light-guide plate 12. FIG.

Similarly, in such a configuration of claim 2 or 3 , for example, the light guide plate 13 has a trapezoidal trapezoidal shape with a cross-sectional area increasing toward the tip of the light exit surface 13B of the light guide plate 13 as shown in FIG. As shown in FIG. 6 (c), the light L2 derived from the exit surface 13B is emitted from the first exit surface 13B ′ having a surface area larger than that of the entrance surface 13A at a wide angle as shown in FIG. The light L2 ′ irradiated to the second emission surface 13B ″ in the peripheral portion can be derived after being irregularly reflected. Therefore, it can suppress that the light guide | induced from the output surface 13B of the light-guide plate 13 interferes, and an interference fringe generate | occur | produces, and the design property of the light-guide plate 13 can be improved.

The light guide plate 10 to the light guide plate 16 or the light guide plate 40 according to claim 4 is dependent on claim 1, and the display unit has a concave pattern that guides light as diffused light on the main surface. It is characterized in that predetermined information is represented by deriving light from a surface facing the main surface .

  According to such a configuration of claim 4, it is possible to easily store predetermined information for a user who has visually recognized the light guide plate 10 to the light guide plate 16 or the light guide plate 40, and to improve the design of the light guide plate. it can.

The light guide plate 10 to the light guide plate 16 or the light guide plate 40 according to claim 5 is dependent on claim 1 and has a plurality of concave patterns formed of dots and a concave shape formed of a line surrounding the plurality of concave patterns. It is formed by a pattern .

According to the configuration of such claim 5, in response to the light guide plate 10 to the intended use of the light guide plate 16 or the light guide plate 40, to form a concave-shaped patterns of various shapes to the main surface of the light guide plate Since it can do, it can make it easy to memorize | store various shapes for the user who visually recognized each light-guide plate, and can improve the design property of this light-guide plate.

The light guide plate 10 to the light guide plate 16 or the light guide plate 40 according to claim 6 is dependent on claim 1 , and the predetermined information includes a character, a figure, a trade name, a character, a symbol, or a combination thereof. It is said.

  According to such a configuration of claim 6, various information can be represented on the main surface of the light guide plate according to the purpose of use of the light guide plate 10 to the light guide plate 16 or the light guide plate 40. It is possible to make it easy for a user who visually recognizes information to store various information, and to improve the design of the light guide plate.

The light guide plate 10 to the light guide plate 16 or the light guide plate 40 according to claim 7 is dependent on claim 1 , and the concave pattern is any one of ultrasonic processing, heating processing, cutting processing, laser processing, and molding processing. Or a combination of these processes.

  According to such a configuration of the seventh aspect, by selecting each processing method according to the specification, cost, required quantity, etc. of the light guide plate 10 to the light guide plate 16 or the light guide plate 40, the concave pattern is changed to each light guide plate. Can be stably formed with high accuracy on the main surface.

  The lighting device 1 or the lighting device 2 according to claim 9 is configured to receive light from the light guide plate 10 to light guide plate 16 or the light guide plate 40 according to claim 1 and an incident surface of the light guide plate adjacent to the light guide plate. The light source 20 or the light source 50 to be held, and at least the holding member 30 or the holding member 60 for holding the light source.

  According to such a configuration of claim 9, using the illuminating device 1 or the illuminating device 2, light having a uniform light distribution that suppresses the generation of interference fringes is displayed, for example, in an exhibition hall Can be irradiated from below or above.

1, 2 Illumination device 10, 11, 12, 13, 14, 15, 16, 40, 100, 110 Light guide plate 10A, 11A, 12A, 13A, 40A, 100A, 110A Incident surface 10B, 11B, 12B, 13B, 40B , 100B, 110B Exit surface 13B ′ First exit surface 13B ″ Second exit surface 10C, 11C, 12C, 13C, 40C, 100C Lower one major surface 10D, 11D, 12D, 13D, 40D, 100D Lower other major surface 10E , 11E, 12E, 13E, 40E, 100E Upper one main surface 10F, 11F, 12F, 13F, 40F, 100F Upper other main surface 110P One main surface 110Q Other main surfaces 11G, 12G, 13G Lower right side surface 11H, 12H, 13H Lower left side surface 11I, 12I, 13I Upper right side surface 11J, 12J, 13J Upper left side surface 10K, 11K, 12K, 13K, 40K, 100K Bent part 10L, 11L, 12L, 13L, 40L Display part 14M, 15M, 16M Base part 14N, 15N, 16N Tip part 20, 50 Light source 30, 60 Holding member 30A, 60A Inner wall 30B Mounting base 60C Engagement holes 41, 42, 43 Patterns L1, L2, L2 ', L3 Light P Engagement member Q Suspension member R Mounting table S Exhibition

Claims (8)

A light guide plate that guides light incident from an incident surface formed in a planar shape from an exit surface facing the incident surface,
It is formed on the plane between the entrance surface and the exit surface, and is formed on the main surface with a dot-like concave pattern and a linear concave pattern for deriving light as diffuse light, and predetermined information is expressed. A display unit,
A curved surface bent or refracted at a predetermined angle in the direction of the main surface provided between the incident surface and the output surface; and
With
Before SL exit surface, the light guide plate, characterized in that it is formed in a different shape as the incident surface. The light guide plate according to claim 1, wherein the exit surface is formed so that a cross-sectional area of the exit surface is once increased . 3. The light guide plate according to claim 2 , wherein a cross section of the emission surface is formed in a circular shape or a trapezoidal trapezoidal shape, or is formed by joining . The display unit is characterized in that a concave pattern for deriving light as diffused light is formed on the main surface, and predetermined information is represented by deriving light from a surface opposite to the main surface. The light guide plate according to claim 1. 2. The light guide plate according to claim 1 , wherein the predetermined information is formed by a plurality of concave patterns made of dots and a concave pattern made of a line surrounding the plurality of concave patterns. . The light guide plate according to claim 1 , wherein the predetermined information includes a character, a figure, a trade name, a character, a symbol, or a combination thereof. The concave pattern, ultrasonic machining, heating, cutting, laser machining, and molding or machining of the machining, or according to claim 1, characterized in that it is formed by combining their processing Light guide plate. The light guide plate according to claim 1;
A light source that is adjacent to the light guide plate and makes light incident from the incident surface of the light guide plate;
A holding member for holding at least the light source
A lighting device characterized by the above.