JP2011181410A - Lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting system applicable to various printed matters different in light transmittance. <P>SOLUTION: The lighting system 1 includes a light source 15 and a light guide plate 13. The light guide plate 13 has front surfaces 131 and 132, and a side surface 133 on which light from the light source 15 is incident. The printed matter having some light transmittance is disposed on the front surface 131 side. In this case, the lighting system functions as a back light. The printed matter low in light transmittance is disposed on the front surface 132 side. In this case, the lighting system 1 functions as a front light. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an illumination device, and more particularly to an illumination device that illuminates a printed material.

  An illumination device typified by a light panel or an electric signboard illuminates a printed material (for example, a poster) including a photographic image, a picture image, and a character image. Such an illuminating device is disclosed in Japanese Utility Model Publication No. 51-2444 (Patent Document 1). The illumination device disclosed in this document irradiates a printed material from the back surface of the printed material.

Japanese Utility Model Publication No. 51-2444 Japanese Utility Model Publication No.59-6656 Japanese Patent No. 3081216

  When the printed matter is irradiated from the back surface of the printed matter, a printed matter having low light transmittance (for example, a printed matter using a paper surface) is difficult to see. Therefore, although the illumination device of Patent Document 1 can be applied to a printed matter with high light transmittance, it is difficult to apply to the printed matter with low light transmittance.

  The objective of this invention is providing the illuminating device which is easy to apply to the printed matter with a high light transmittance, and a printed matter with a low light transmittance.

Means and effects for solving the problems

  The illumination device according to the present invention includes a light source and a light guide plate. The light guide plate has a first surface, a second surface, and a side surface. The first surface is disposed to face the back wall. The second surface is disposed on the opposite side of the first surface. The side surface is disposed between the first surface and the second surface, and light from the light source is incident thereon. The illuminating device functions as a front light when the printed material is disposed on the first surface side, and functions as a backlight when the printed material is disposed on the second surface side.

  The lighting device according to the present invention functions as both a front light and a backlight. Therefore, the lighting device according to the present invention can be easily applied to a printed matter having a high light transmittance and a printed matter having a low light transmittance.

  Preferably, the lighting device includes an arrangement member. The arrangement member arranges the printed matter on the first surface side and the second surface side.

  Preferably, the arrangement member includes a housing. The housing includes a side wall and a back wall. The light source and the light guide plate are housed in a housing. The first surface of the light guide plate is disposed on the back wall side, and the second surface is disposed on the front side of the housing. First and second storage chambers are formed in the housing. The second storage chamber is formed on the front side of the housing with respect to the first storage chamber. The first storage chamber and the second storage chamber are partitioned by a light guide plate.

  When the printed matter is stored in the first storage chamber, the lighting device functions as a front light. When the printed material is stored in the second storage chamber, the lighting device functions as a backlight.

  Preferably, the lighting device further includes a transparent plate attached to the front surface of the housing.

  Preferably, a plurality of convex portions or concave portions are formed on the first surface or the second surface of the light guide plate.

  Preferably, the first surface emits more light incident on the light guide plate from the light source to the outside than the second surface.

  In this case, the printed matter stored in the first storage chamber can be easily seen clearly.

  Preferably, the lighting device further includes a reflecting member. The reflecting member is disposed on the surface of the back wall in the housing.

  In this case, the printed matter stored in the second storage chamber can be clearly seen.

  Preferably, the lighting device further includes a first printed material and a second printed material. The first printed matter is stored in the first storage chamber. The second printed material is stored in the second storage chamber. The second printed material has higher light transmittance than the first printed material.

  In this case, the lighting device can display a novel design.

  Preferably, the arrangement member includes a housing and an attachment member. The attachment member attaches the printed material on the second surface. The housing includes a side wall and a back wall, and has an opening in the front. The light source and the light guide plate are housed in a housing. The first surface is disposed on the back wall side, and the second surface is disposed on the front side of the housing. A storage chamber is formed between the light guide plate and the back wall.

  In this case, if the printed matter is stored in the storage chamber, the lighting device functions as a front light. On the other hand, if the printed material is arranged on the second surface by the attachment member, the lighting device functions as a backlight. Therefore, the lighting device can be easily applied to a printed matter having a high light transmittance and a printed matter having a low light transmittance.

It is a perspective view of the illuminating device by embodiment of this invention. It is sectional drawing in the II-II line in FIG. It is sectional drawing of an illuminating device when a printed matter is accommodated in the illuminating device shown in FIG. It is a front view of the illuminating device shown in FIG. It is sectional drawing of an illuminating device when a printed matter is accommodated in the place different from FIG. It is a front view of the illuminating device shown in FIG. It is sectional drawing of an illuminating device when two printed materials are accommodated. It is a front view of the illuminating device shown in FIG. It is sectional drawing of the other illuminating device which has a structure different from FIG. It is sectional drawing of the other illuminating device which has a structure different from FIG.2 and FIG.9. It is sectional drawing of the other illuminating device which has a structure different from FIG.2, FIG.9 and FIG.10. It is sectional drawing of the other illuminating device which has a structure different from FIG. 2, FIG. It is sectional drawing of an illuminating device when a printed matter is accommodated in the illuminating device shown in FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

[Configuration of lighting device]
FIG. 1 is a perspective view of a lighting device according to the present embodiment. The lighting device 1 includes a housing 11 and a transparent plate 12. The casing 11 has a flat rectangular parallelepiped shape and has an opening in the front. The material of the housing 11 may be a metal or a resin having low light transmittance.

  The transparent plate 12 is attached to the front surface of the housing 11. The transparent plate 12 is light transmissive to visible light. The material of the transparent plate 12 is, for example, glass, polyester resin, polycarbonate resin, polyacrylate resin, alicyclic polyolefin resin, polystyrene resin, polyvinyl chloride resin, polyvinyl acetate resin, poly Resins such as ether sulfonic acid resins and triacetyl cellulose resins.

  2 is a cross-sectional view taken along line II-II in FIG. With reference to FIG. 2, the housing | casing 11 is provided with the back wall 11B and the side wall 11S. The illumination device 1 further includes a light guide plate 13 and a light source 15. The light guide plate 13 and the light source 15 are accommodated in the housing 11. The side wall 11S has a groove 11G. The groove 11G extends along the back wall 11B and the transparent plate 12. The light source 15 is accommodated in the groove 11G. The light source 15 is, for example, a plurality of light emitting diodes (LEDs) arranged along the groove 11G or a cold cathode tube.

  The light guide plate 13 is disposed next to the light source 15. The light guide plate 13 is further disposed between the transparent plate 12 and the back wall 11B.

  The light guide plate 13 has a plate shape or a sheet shape. The light guide plate 13 has surfaces 131 and 132 and side surfaces 133. The surface 132 is disposed to face the back wall 11B. The surface 131 is disposed on the side opposite to the surface 132. The surface 131 is disposed to face the transparent plate 12. The side surface 133 is disposed to face the light source 15. Light from the light source 15 is incident on the side surface 133.

  The surface 131 is a structured surface. Specifically, the surface 131 has a plurality of convex portions CP. The plurality of convex portions CP have a known shape. The convex portion CP is, for example, a linear prism extending along the groove 11G. The plurality of convex portions CP are arranged side by side in the vertical direction of the lighting device 1. In FIG. 2, the surface 131 has a flat part between adjacent convex parts CP. That is, the adjacent convex portions CP are arranged apart from each other.

  The convex portion CP includes an inclined surface S1 and an inclined surface S2. The inclined surface S1 is closer to the light source 15 than the inclined surface S2. The base angle of the inclined surface S1 (angle formed by the flat portion of the surface 131 and the inclined surface S1) is smaller than the base angle of the inclined surface S2 (angle formed by the flat portion of the surface 131 and the inclined surface S2). The inclined surface S2 mainly reflects the light from the light source 15 totally. The totally reflected light passes through the surface 132. On the other hand, the inclined surface S <b> 1 mainly transmits light incident from the surface 132 and exits to the front of the lighting device 1.

  The light guide plate 13 is a so-called front light guide plate. That is, the surface 132 emits more light incident on the light guide plate 13 from the light source 15 than the surface 131.

  The lighting device 1 further includes a reflecting member 14. The reflection member 14 has a plate shape, a sheet shape, or a film shape. The reflection member 14 is disposed on the surface of the back wall 11B in the housing 11. The reflective member 14 faces the surface 132. The reflecting member 14 reflects light from the surface 132 and returns it to the surface 132 again. The reflecting member 14 is, for example, Toray Lumirror (registered trademark) E60L or E60V. The diffuse reflectance of the reflecting member 14 is preferably 95% or more.

  Storage chambers 21 and 22 are formed in the housing 11. The storage chamber 21 is arranged on the front side of the lighting device 1 with respect to the storage chamber 22. The storage chamber 21 and the storage chamber 22 are partitioned by the light guide plate 13. That is, the storage chamber 22 is formed between the surface 132 and the back wall 11 </ b> B, and the storage chamber 21 is formed between the surface 131 and the transparent plate 12.

  Printed matter is stored in the storage chambers 21 and 22. The printed material is in the form of a sheet or film, and an image is drawn or printed. The image is, for example, a character image, a picture image, or a decoration image. The printed material is, for example, a poster.

  The side wall 11 </ b> S further has insertion openings 23 and 24. The insertion port 23 is connected to the storage chamber 21. More specifically, the insertion port 23 has an opening end that opens to the outer surface of the side wall 11 </ b> S and an opening end that opens to the storage chamber 21. The insertion port 23 has, for example, a rectangular shape (slit shape). The printed material is inserted into the storage chamber 21 through the insertion port 23.

  The insertion port 24 is connected to the storage chamber 22. More specifically, the insertion port 24 has an opening end that opens to the outer surface of the side wall 11 </ b> S and an opening end that opens to the storage chamber 22. The insertion port 24 has, for example, a rectangular shape (slit shape). The printed material is inserted into the storage chamber 22 from the insertion port 24.

[Utilization of lighting device 1 as a backlight]
When using the illuminating device 1 as a backlight, the printed matter 31 is accommodated in the storage chamber 21, as shown in FIG. The printed material 31 is inserted into the storage chamber 21 through the insertion port 23. FIG. 4 is a front view of the lighting device 1 in which the printed material 31 is stored. Images 31a, 31b, and 31c, which are graphic images, are drawn on the printed matter 31 shown in FIG. The printed matter 31 shown in FIG. 4 is an example. Therefore, the image drawn on the printed material 31 is not limited to this.

  Referring again to FIG. 3, in the lighting device 1, the light R <b> 1 from the light source 15 enters the light guide plate 13. The incident light R1 is mainly totally reflected by the surface 131 and is emitted from the surface 132 to the outside. The light R1 emitted from the surface 132 is reflected by the reflecting member 14 and enters the light guide plate 13 from the surface 132 again. The light that has entered the light guide plate 13 again passes through the surface 131 and is emitted in the front direction of the lighting device 1. Light emitted from the surface 131 to the outside enters the printed matter 31.

  The illumination device 1 irradiates the printed material 31 from the back surface of the printed material 31 through the above steps. That is, the lighting device 1 functions as a backlight type light panel. The printed matter 31 receives light from the back surface. Therefore, when the light transmittance of the printed material 31 is low, the printed material 31 is difficult to see. Therefore, it is preferable that the light transmittance of the printed matter 31 is high to some extent.

[Use of lighting device 1 as a front light]
When the lighting device 1 is used as a front light, the printed matter 32 is stored in the storage chamber 22 as shown in FIG. The printed material 32 is inserted into the storage chamber 22 from the insertion port 24. In FIG. 5, the printed material is not stored in the storage chamber 21. FIG. 6 is a front view of the lighting device 1 in which the printed matter 32 is stored. Images 32a and 32b, which are character images, are drawn on the printed matter 32 shown in FIG. The printed matter 32 shown in FIG. 6 is an example. Therefore, the image drawn on the printed matter 32 is not limited to this.

  Referring again to FIG. 5, in the lighting device 1, the light from the light source 15 is totally reflected by the surface 131 as in FIG. 3. The light totally reflected by the convex portion CP passes through the surface 132 and is emitted to the outside of the light guide plate 13. The light emitted from the surface 132 is reflected by the surface of the printed matter 32. The reflected light enters the surface 132 and travels through the light guide plate 13 again. The light that has returned to the light guide plate 13 passes through the surface 131 and exits outside (in front of the lighting device 1).

  The illumination device 1 irradiates the printed matter 32 from the surface of the printed matter 32 through the above steps. That is, the illumination device 1 functions as a front light type light panel. In this case, even if the light transmittance of the printed matter 32 is low, the printed matter 32 is clearly seen. For example, even if the character images 32a and 32b of the printed matter 32 are drawn in black in a black ink style or drawn in a metallic color such as gold or silver, the images 32a and 32b are clearly seen. Even if the printed matter 32 is a paper medium, the images 32a and 32b are clearly seen.

  As described above, the lighting device 1 can function as a backlight or a front light. Since the illuminating device 1 also functions as a front light, the light guide plate 13 is not a so-called white dot printing type light guide plate, but a light guide plate having a shaped surface. This is because when the light guide plate 13 is a white dot printing type light guide plate, white dots are visible when the lighting device 1 is used as a front light.

[Utilization of lighting device 1 as backlight and front light]
The illumination device 1 may further store printed matter in each of the storage chambers 21 and 22, as shown in FIG. In this case, the lighting device 1 can display a novel design.

  In the lighting device 1 of FIG. 7, the printed material 32 is stored in the storage chamber 22, and the printed material 31 is further stored in the storage chamber 21. The light transmittance of the printed matter 31 is higher than the light transmittance of the printed matter 32. In this example, the printed matter 31 is a transparent sheet-like print medium (for example, acrylic resin). Images 31a to 31c are drawn on the surface of the printed matter 31 with a light-transmitting paint. On the other hand, the printed matter 32 is, for example, a paper medium. Therefore, the light transmittance of the printed matter 32 is lower than that of the printed matter 31. On the surface of the printed matter 32, metallic color images 32a and 32b having high reflectivity are drawn.

  Thus, when the printed matter 31 or 32 is accommodated in the storage chambers 21 and 22, respectively, as shown in FIG. 8, the images 31a to 31c on the printed matter 31 are the images 32a and 32b on the printed matter 32 and the background ( For example, the image is displayed on the paper medium itself. In this case, the images 31 a to 31 c on the printed material 31 appear to float from the printed material 32.

  As described above, in FIG. 7, the illumination device 1 arranges the printed material 31 on the surface 131 side of the light guide plate 13 and arranges the printed material 32 on the surface 132 side. At this time, the illumination device 1 functions as a backlight for the printed material 31 and functions as a front light for the printed material 32. Therefore, the illuminating device 1 can illuminate the printed materials 31 and 32 simultaneously. Further, the lighting device 1 displays the printed material 31 so as to overlap the printed material 32. Therefore, the lighting device 1 can easily realize a novel design in which a picture image or a character image appears.

[Other embodiments]
In the illuminating device 1 described above, the reflecting member 14 is disposed on the inner surface of the back wall 11B. However, as shown in FIG. 9, the reflecting member 14 may not be disposed in the housing 11. That is, the lighting device 1 may not include the reflecting member 14. The lighting device shown in FIG. 9 can also illuminate the printed material stored in the storage chamber 21 and can illuminate the printed material stored in the storage chamber 22.

  In the lighting device 1 described above, the light guide plate 13 has a structured surface 131. In other words, the light guide plate 13 has a surface 131 on which a plurality of convex portions CP are formed. However, the light guide plate 13 may have a surface 131 on which a plurality of concave portions are formed instead of the plurality of convex portions CP. At this time, the shape of the convex part and the concave part may be a well-known shape formed on a well-known light guide plate for a front light.

  Furthermore, instead of the surface 131, the surface 132 may be structured. That is, the light guide plate 13 may have a surface 132 having a plurality of convex portions or concave portions. The light guide plate 13 may further include a surface 131 having a plurality of convex portions or a plurality of concave portions, and a surface 132 having a plurality of convex portions or a plurality of concave portions.

  In short, it is sufficient that at least one of the surfaces 131 and 132 of the light guide plate 13 is structured. At this time, the shape of the convex part or the concave part of the surfaces 131 and 132 may be the same as the shape of the well-known front light guide plate. The amount of light emitted from the light source 15 is preferably greater on the surface 132 than on the surface 131. When the illuminating device 1 is used as a front light, if a large amount of light from the light source 15 is emitted from the surface 131, the light use efficiency decreases. However, even if the amount of light emitted from the light source 15 on the surface 131 is equal to or greater than that on the surface 132, the lighting device 1 can be used to some extent as a front light and can be used to some extent as a backlight.

  In the above-described embodiment, the printed materials 31 and 32 are stored in the storage chambers 21 and 22 using the insertion openings 23 and 24. However, the printed materials 31 and 32 may be stored in the storage chambers 21 and 22 by other methods.

  For example, in the illumination device 100 illustrated in FIG. 10, the insertion openings 23 and 24 are not formed as compared with the illumination device 1. Instead, in the lighting device 100, the transparent plate 12 is detachably attached to the housing 11. Moreover, the back wall 11B is attached to the side wall 11S of the housing | casing 11 so that attachment or detachment is possible. In this case, the printed matter can be stored in the storage chamber 21 by removing the transparent plate 12 from the housing 11. Further, if the back wall 11B is removed from the housing 11, the printed matter can be stored in the storage chamber 22.

  In the illumination device 150 shown in FIG. 11, the transparent plate 12 is attached to the housing 11 by a hinge 120 so as to be opened and closed. The back wall 11B is attached to the side wall 11S of the housing 11 by a hinge 110 so as to be opened and closed. The upper end of the transparent plate 12 is attached to the side wall 11S of the housing 11 via a hinge 120. When storing the printed matter in the storage chamber 21, the transparent plate 12 is rotated around the hinge 120. Thereby, the transparent plate 12 is opened, and the printed material can be stored in the storage chamber 21.

  Similarly, the upper end of the back wall 11 </ b> B is attached to the side wall 11 </ b> S of the housing 11 via the hinge 110. When the printed matter is stored in the storage chamber 22, the back wall 11 </ b> B is rotated around the hinge 110. Thereby, the back wall 11 </ b> B is opened, and the printed matter can be stored in the storage chamber 22.

  The lighting devices 1, 100, and 150 described above include a transparent plate 12. However, the lighting device according to the present embodiment may not include the transparent plate 12. In this case, the front of the storage chamber 21 is open. However, if the printed matter 31 is stored in the storage chamber 21, the above-described effects can be achieved without the transparent plate 12. In this case, the printed matter 31 may be disposed on the surface 131 of the light guide plate 13 by a transparent adhesive tape or the like.

  The lighting device 160 illustrated in FIG. 12 does not include the transparent plate 12. The lighting device 160 includes mounting members 510 and 511. The attachment members 510 and 511 are disposed on the periphery of the surface 131 of the light guide plate 13. The attachment member 510 has a plate shape extending along the groove 11G. The end of the attachment member 510 is attached to the end of the upper side wall 11S1 via a hinge. Therefore, the attachment member 510 is attached to the end of the upper side wall 11S1 so as to be openable and closable.

  Similarly to the mounting member 510, the mounting member 511 has a plate shape extending along the groove 11G. The end of the attachment member 511 is attached to the end of the lower side wall 11S2 via a hinge. Therefore, the attachment member 511 is attached to the end of the lower side wall 11S2 so that it can be opened and closed.

  When the printed material 31 is disposed on the surface 131 of the light guide plate 13, the attachment members 510 and 511 are opened. And after arrange | positioning the printed matter 31 on the surface 131, as shown in FIG. 13, the attachment members 510 and 511 are closed. The printed matter 31 is fixed on the surface 131 by attachment members 510 and 511.

  The attachment members 510 and 511 may have a known configuration other than those shown in FIGS. In short, the attachment members 510 and 511 may have any configuration as long as the printed material 31 can be attached on the surface 131.

  Any of the shapes of the casing 11 of the lighting device according to the above-described embodiment is a rectangular parallelepiped. However, the housing 11 may have other shapes. For example, the housing 11 may have a rectangular parallelepiped shape having rounded corners (corners). Moreover, the housing | casing 11 may be disk shape and cylindrical shape by which the side wall 11S becomes a cylindrical surface. In short, the shape of the housing 11 is not particularly limited.

  In the lighting device according to the above-described embodiment, the printed materials 31 and 32 are arranged on the surface 131 side and the surface 132 side of the light guide plate 13 by the storage chambers 21 and 22 in the housing 11 or by the mounting members 510 and 511. However, the lighting device may arrange the printed matter 31 on the front surface 131 side or the printed matter 32 on the front surface 132 side by another arrangement member different from the casing 11 and the attachment members 510 and 511.

  In short, the illumination device according to the present embodiment includes the light source 15 and the light guide plate 13, and functions as a backlight when the printed matter 31 is arranged on the surface 131 side, and the printed matter 32 is arranged on the surface 132 side. Function as a front light.

  While the embodiments of the present invention have been described above, the above-described embodiments are merely examples for carrying out the present invention. Therefore, the present invention is not limited to the above-described embodiment, and can be implemented by appropriately modifying the above-described embodiment without departing from the spirit thereof.

DESCRIPTION OF SYMBOLS 1,100,150,160 Illuminating device 11 Housing | casing 11B Back wall 11S Side wall 12 Transparent plate 13 Light guide plate 14 Reflective member 15 Light source 21, 22 Storage chamber 23, 24 Insertion port 31, 32 Printed product 131, 132 Surface 133 Side surface 510, 511 Mounting member CP Convex part

Claims (14)

A light source;
A light guide plate having a first surface, a second surface opposite to the first surface, and a side surface disposed between the first surface and the second surface on which light from the light source is incident. Prepared,
An illumination device that functions as a front light when a printed material is disposed on the first surface side and functions as a backlight when the printed material is disposed on the second surface side. The lighting device according to claim 1,
An illuminating device comprising: an arrangement member for arranging a printed material on the first surface side and the second surface side. The lighting device according to claim 2,
The arrangement member is
A side wall and a back wall, and a housing having an opening on the front surface;
The light source and the light guide plate are housed in the housing,
The first surface is disposed on the back wall side, and the second surface is disposed on the front side of the housing,
A first storage chamber and a second storage chamber disposed on the front side of the housing with respect to the first storage chamber are formed in the housing,
The lighting device, wherein the first storage chamber and the second storage chamber are partitioned by the light guide plate. The lighting device according to claim 3, further comprising:
A lighting device comprising a transparent plate attached to a front surface of the housing. The lighting device according to claim 3 or 4,
A lighting device in which a plurality of convex portions or concave portions are formed on the first surface or the second surface. The lighting device according to claim 5,
The lighting device in which the first surface emits more light incident on the light guide plate from the light source to the outside than the second surface. The lighting device according to any one of claims 3 to 6, further comprising:
An illuminating device comprising a reflecting member disposed on a surface of the back wall in the housing. It is an illuminating device of any one of Claims 3-7, Comprising:
A lighting device in which printed matter is stored in the first storage chamber and / or the second storage chamber. The lighting device according to claim 8, further comprising:
A first printed material stored in the first storage chamber;
A lighting device comprising: a second printed material housed in the second storage chamber and having a light transmittance higher than that of the first printed material. The lighting device according to claim 3,
The side wall further includes a first insertion port connected to the first storage chamber and into which a printed material is inserted. The lighting device according to claim 4,
The side wall further includes a second insertion port that is connected to the second storage chamber and into which a printed material is inserted. The lighting device according to claim 3,
The said back wall is an illuminating device attached to the said side wall so that attachment or detachment or opening and closing is possible. The lighting device according to claim 4,
The said transparent plate is an illuminating device attached to the said housing | casing so that attachment or detachment is possible. The lighting device according to claim 2,
The arrangement member is
A housing having a side wall and a back wall, and having an opening on the front surface;
An attachment member for attaching the printed matter on the second surface;
The light source and the light guide plate are housed in the housing,
The first surface is disposed on the back wall side, and the second surface is disposed on the front side of the housing,
A lighting device in which a storage chamber is formed between the light guide plate and the back wall.

Images