JP2012248443A - Lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting system capable of switching illumination manner.SOLUTION: The lighting system is provided with: a light source; at least a pair of light guide plates, which have a pair of opposed plate surfaces and guide light from the light source by repeating internal reflection between the pair of plate surfaces; and an optical deflection surface which is installed on at least one of the pair of plate surfaces for every light guide plate and emits to the outside of the light guide plates by deflecting a part of light that internally reflects in the light guide plates.

Description

  The present invention relates to a lighting device, and more particularly to a lighting device that illuminates a space facing at least one surface of a light guide plate by causing the light guide plate to emit light.

  A general window attached to a building takes in outside light from the outside and closes it to prevent entry of wind and rain, and also opens it appropriately for ventilation. By the way, in recent years, attempts have been made to give the window itself a lighting function. For example, in Patent Document 1, a concave portion is provided in a window base, a light emitting portion is disposed in the concave portion, and light is incident from the lower end portion of the flat plate to cause the flat plate to emit light. Technology is disclosed.

JP 2007-315073 A

  On the other hand, it is desired to be able to illuminate in different modes according to the lighting scene by emitting light in different areas on the plate surface of the flat plate or switching the width and pattern of the light emitting area to emit light. Yes. However, the invention described in Patent Document 1 is not configured so that the illumination mode can be switched. Although it is possible to make only a part of the light emitting parts emit light, it is difficult to emit light only in a predetermined region because the light from the light emitting part is guided while spreading within a plane plate with a predetermined radiation angle. Because. That is, it is difficult to perform illumination in various modes according to the illumination scene.

  An object of this invention is to provide the illuminating device comprised so that switching of the illumination aspect was possible.

The invention according to claim 1 has a light source and at least a pair of light guide plates that have a pair of opposed plate surfaces and guide light from the light sources by repeating internal reflection between the pair of plate surfaces. The light that is provided on at least one of the pair of plate surfaces for each of the light guide plates, and is emitted to the outside of the light guide plate by deflecting a part of the light reflected on the inner surface of the light guide plate. And a deflecting surface.
The invention according to claim 2 is the illuminating device according to claim 1, wherein the light deflection surface is different in position, width, or shape for each of the light guide plates, or a combination thereof. The light source has a configuration in which the light is selectively incident on each light guide plate.
The invention described in claim 3 is the illumination device according to claim 1 or 2, wherein the light is totally reflected by the inner surfaces of the pair of plate surfaces.
According to a fourth aspect of the present invention, there is provided the lighting device according to any one of the first to third aspects, wherein the pair of light guide plates are arranged in parallel, and at least one of the light guide plates. The light deflection surface provided on one light guide plate is provided on a side facing at least one of the other light guide plates.
The invention according to claim 5 is the illumination device according to any one of claims 1 to 4, wherein a plurality of the light sources are arranged along an end surface of the light guide plate, and arranged in the arrangement direction. The spreading light is output, and the light deflection surface is provided on a side farther from the light source than a position where light from adjacent light sources intersects for the first time.

  The illuminating device according to the present invention deflects a part of the light guided by the internal reflection in the light guide plate by the light deflecting surface and emits the light to the outside of the light guide plate. Since the light deflection surface can be provided for each light guide plate, surface light can be emitted in a different manner for each light guide plate on which light is incident by selectively allowing light from the light source to enter each light guide plate. It becomes possible. That is, according to the illuminating device according to the present invention, it is possible to illuminate in different modes by switching the light guide plate through which light enters according to the illumination scene.

It is a front view of the illuminating device which concerns on this invention. It is the schematic sectional drawing which cut | disconnected the illuminating device which concerns on this invention by II-II in FIG. It is a figure for demonstrating a mode that the light guide | induced inside the light-guide plate is deflected by the light deflection surface. It is a figure for demonstrating an example of the derivation | leading-out method of the position which installs an optical deflection surface. It is a figure for demonstrating a mode that the light guide | induced inside the light-guide plate is deflected by the light deflection | deviation structure. It is the front view which showed the one aspect | mode of the illuminating device which concerns on this invention.

  The illuminating device according to the present invention adds an illumination function to the interior window and causes the plane plate of the interior window to emit light. An illumination device according to the present invention will be described with reference to FIGS. In describing the lighting device according to the present invention, the horizontal direction of the front view shown in FIG. 1 is the x direction, the height direction is the z direction, and the depth direction orthogonal to the x direction and the z direction is the y direction. That is, FIG. 2 is a schematic cross-sectional view of the lighting device according to the present invention cut along a yz plane indicated by II-II in FIG.

  As shown in FIG. 1, the lighting device according to the present invention includes a window frame 1, light guide plates 3 </ b> A and 3 </ b> B, a lighting unit 42, and a power supply unit 43.

  The window frame 1 includes a window frame upper part 11, a window frame lower part 12, and a window frame side part 13. The window frame upper part 11 and the window frame lower part 12 are opposed to each other, and the window frame side part 13 is constructed so as to bridge between the vicinity of the opposite end of the window frame upper part 11 and the vicinity of the end of the window frame lower part 12. Is provided. As shown in FIG. 2, the window frame upper portion 11 is a plate body having a rectangular shape with a slight depth in plan view. The window frame upper portion 11, the window frame lower portion 12, and the window frame side portion 13 can be formed of, for example, a metal such as aluminum, wood, or an opaque resin.

  As shown in FIG. 1, circumferential grooves 2 </ b> A and 2 </ b> B are provided on the inner surface of the window frame 1, that is, the inner surfaces of the window frame upper portion 11, the window frame lower portion 12, and the window frame side portion 13. Further, as shown in FIG. 2, the circumferential grooves 2A and 2B are formed at a predetermined interval in the y direction.

  As shown in FIG. 1, the light guide plate 3A has, for example, a rectangular flat plate shape, and includes a front surface 34, a back surface 35A, an upper end surface 31, a lower end surface 32, and a side provided around the front surface 34 and the back surface 35A. And a part end face 33. A light emitting area 36A is provided on the back surface 35A. A light deflection surface 5A is provided in the light emitting region 36A. Details of the light deflection surface 5A will be described later. The upper end surface 31, the lower end surface 32, and the side end surface 33 of the light guide plate 3A are configured to be fitted in the circumferential groove 2A. Thereby, the upper end surface 31, the lower end surface 32, and the side end surface 33 of the light guide plate 3A can be engaged with the circumferential groove 2A. The light guide plate 3A is attached to the window frame 1 by this engagement.

  Similarly, the light guide plate 3B includes a front surface 34, a back surface 35B, and an upper end surface 31, a lower end surface 32, and a side end surface 33 provided around the front surface 34 and the back surface 35B. A light emitting area 36B is provided on the back surface 35B. A light deflection surface 5B is provided in the light emitting region 36B. Details of the light deflection surface 5B will be described later. The upper end surface 31, the lower end surface 32, and the side end surface 33 of the light guide plate 3B are configured to be fitted in the circumferential groove 2B. The light guide plate 3B is attached to the window frame 1 by engaging the upper end surface 31, the lower end surface 32, and the side end surface 33 of the light guide plate 3B with the circumferential groove 2B.

  The light guide plates 3A and 3B are more preferably attached to the window frame 1 so that the back surface 35A of the light guide plate 3A and the back surface 35B of the light guide plate 3B face each other. By mounting in this way, the light deflection surfaces 5A and 5B are provided in the inner space formed by the light guide plates 3A and 3B. Since this inner space is physically protected by the light guide plates 3A and 3B, it is difficult to get dirty with dust or dust, and it is possible to prevent the light deflection surfaces 5A and 5B from being peeled off by cleaning or the like. In the following description, it is assumed that the light deflection surfaces 5A and 5B are provided in this inner space.

  The light guide plates 3A and 3B are light-transmitting thin plates capable of transmitting light. The light guide plates 3 </ b> A and 3 </ b> B are internally reflected (totally reflected) between the front surface 34 and the back surface 35 when light is incident from any one of the upper end surface 31, the lower end surface 32, and the side end surface 33. The incident light is guided to the opposite end. For the light guide plates 3A and 3B, for example, a resin such as acrylic or polycarbonate, or glass is employed. Hereinafter, when the light guide plates 3A and 3B are not particularly distinguished, they may be simply referred to as “light guide plate 3”. In this case, the light deflection surfaces 5A and 5B may be simply referred to as “light deflection surface 5” without any particular distinction. Similarly, the back surfaces 35A and 35B may be simply referred to as “back surface 35”, and the light emitting regions 36A and 36B may be simply referred to as “light emitting region 36”. Further, the front surface 34 and the back surface 35 correspond to “a pair of plate surfaces”.

  As shown in FIG. 1, the light guide plates 3A and 3B have a height of W1 in the z direction and a width of W2 in the x direction. Further, as shown in FIG. 2, the light guide plates 3A and 3B have a thickness of W3 in the y direction. As the light guide plates 3A and 3B, those having a height W1 of 15 cm to 200 cm, a width W2 of 15 cm to 200 cm, and a thickness W3 of 0.5 cm to 3 cm are generally used. If light incident from any one of the upper end face 31, the lower end face 32, and the side end face 33 can be guided to the opposite end, the dimensions of the light guide plates 3A and 3B, that is, W1, W2, and W3 are not limited to the above.

  The light guide plates 3A and 3B have a flat plate shape in which the front surface 34 and the back surface 35 are rectangular. However, the shapes of the front surface 34 and the back surface 35 are not limited to a rectangle. The shape of the front surface 34 and the back surface 35 is not limited as long as light incident on a part of the end surfaces provided around the front surface 34 and the back surface 35 is guided to a part on the opposite side. For example, the light guide plates 3A and 3B may have a planar shape in which the front surface 34 and the back surface 35 are circular. Further, the light guide plates 3A and 3B are not limited to a flat plate shape, and for example, a columnar plate may be used. In this case, the light deflection surface 5 may be provided on the side surfaces of the columnar light guide plates 3A and 3B.

  As shown in FIGS. 1 and 2, the window frame upper portion 11 is provided with a recess 111 having a shape that is long in the x direction on the back side of the circumferential grooves 2 </ b> A and 2 </ b> B. As shown in FIG. 2, in the recess 111A, a lighting unit 42 having a width substantially equal to the width of the recess 111A in the y direction and having a shape elongated in the x direction is accommodated. Similarly, the illumination unit 42 having a width substantially equal to the width of the recess 111B in the y direction and having a long shape in the x direction is also stored in the recess 111B. The illumination unit 42 is provided with a light source 41. The light source 41 is disposed to face the upper end face 31 of the light guide plate 3A or 3B. For example, an LED (Light Emitting Diode) is used as the light source 41. In this case, a plurality of light emitting diodes are arranged in the major axis direction (that is, the x direction) of the lighting unit 42 at equal intervals. In this case, the upper end face 31 corresponds to “a part of the end face”.

  By providing the light source 41 in this way, it is possible to irradiate the light emitted from the light source 41 to each of the upper end surfaces 31 of the light guide plates 3A and 3B. In addition, you may use other than LED for the light source 41, and what is necessary is just to arrange | position so that light can be irradiated to each of the upper end surfaces 31 of light-guide plate 3A and 3B according to the aspect. The light emitted from the light source 41 is not necessarily incident from the upper end surface 31 of the light guide plates 3A and 3B, and may be incident from the lower end surface 32, the side end surface 33, the front surface 34, or the back surface 35.

  Further, the power supply unit 43 for the illumination unit 42 is housed in the recesses 111 </ b> A and 111 </ b> B in the same manner as the illumination unit 42. The power supply unit 43 is configured to be able to switch on / off of the light source 41 for each illumination unit 42. Thereby, the light from the light source 41 can be selectively incident on each light guide plate 3. The recesses 111 </ b> A and 111 </ b> B can further use the remaining space after the illumination unit 42 and the power supply unit 43 are accommodated as a space for accommodating the extra length portion of the power supply line to the illumination unit 42.

Next, the light deflection surfaces 5A and 5B will be described by taking the light deflection surface 5A as an example. In this example, the light deflection surface 5A is provided by applying a scattering agent to the light emitting region 36A on the back surface 35 of the light guide plate 3A. The scattering agent deflects (ie, scatters) the direction of incident light in a random direction. Examples of the scattering agent used as the light deflection surface 5A include titanium oxide (TiO ₂ ), calcium carbonate (CaCO ₃ ), various pigment-based inks, or resin fine particles.

  Reference is now made to FIG. FIG. 3 is a diagram for explaining how light guided in the light guide plate 3A is deflected by the light deflection surface 5A, and shows an optical path of light guided in the light guide plate 3A. In FIG. 3, for the sake of explanation, a part of the light path of the light beam guided in the light guide plate 3A is schematically shown by a single line. As indicated by the optical path L1, light incident on the light guide plate 3A from the upper end surface 31 is directed toward the lower end surface 32 while repeating internal reflection between the inner surface 34 ′ of the front surface 34 and the inner surface 35 ′ of the rear surface 35. Be guided. At this time, the light incident on the light guide plate 3A is totally reflected by the inner surfaces 34 'and 35'.

  As indicated by the optical path L2, the light incident on the light guide plate 3A is deflected by the light deflection surface 5A when entering the region where the light deflection surface 5A is provided. Thereby, the light is emitted to the outside of the light guide plate 3A without being totally reflected by the inner surface 35 '. Specifically, the light incident on the inner surface 35 ′ where the light deflection surface 5 </ b> A is provided enters the light deflection surface 5 </ b> A. The light incident on the light deflection surface 5A is deflected in a random direction by colliding with particles of the scattering agent. At this time, a part of the light incident on the light guide plate 3A in the direction from the light guide plate 3A toward the light deflection surface 5A is emitted to the back surface 35 side as indicated by the optical path L2a. Further, a part of the direction reflected by the light deflection surface 5A is emitted to the surface 34 side as indicated by the optical path L2b. Light in the vicinity of the light deflection surface 5A is illuminated by the light emitted to the outside of the light guide plate 3A.

  The light guide plates 3A and 3B may have different installation positions, widths, or shapes on the back surface 35, or combinations thereof. Thereby, by selectively making the light from the light source 41 incident on each light guide plate 3, it is possible to cause surface light emission in a different manner for each light guide plate 3 on which the light is incident.

  For example, in FIG. 1, the light deflection surface 5A is provided below the z direction, and the light deflection surface 5B is provided above the z direction. Thereby, the place to illuminate can be changed by selectively making the light from the light source 41 incident on each light guide plate 3. Specifically, when light from the light source 41 is incident on the light guide plate 3B, the light is emitted from the light deflection surface 5A. The vicinity (for example, overhead) of the window frame upper part 11 is illuminated by the light emitted from the light deflection surface 5A. Further, when the light from the light source 41 is incident on the light guide plate 3A, this light is emitted from the light deflection surface 5B. The light emitted from the light deflection surface 5B illuminates the vicinity (for example, the feet) of the lower portion 12 of the window frame. Further, by making the widths and shapes of the light deflection surfaces 5A and 5B different, for example, the light quantity can be changed by switching the light guide plate 3 on which the light from the light source 41 is incident. Moreover, you may change the color of the light of the light source 41 for every light-guide plate 3 to make it enter. Thus, by selectively making the light from the light source 41 incident on each light guide plate 3, it is possible to cause surface light emission in a different manner for each light guide plate 3 on which the light is incident. Moreover, since the illumination mode is switched by selectively making light from the light source 41 incident on each light guide plate 3, the illumination mode can be switched without changing the light guide plate 3.

  Since the light guide plates 3A and 3B are installed so that the back surface 35A of the light guide plate 3A and the back surface 35B of the light guide plate 3B are opposed to each other, the light deflection surfaces 5A and 5B are the light guide plates 3A and 3B. It is installed in the space between. This prevents dust and dirt from accumulating on the light deflection surfaces 5A and 5B, and prevents the light deflection surfaces 5A and 5B from being peeled off due to dust or dust cleaning.

  Further, the lower end surface 32 is coated with a metal or the like to form a reflection surface on the lower end surface 32, and the light guided in the light guide plate 3A is reflected by the reflection surface provided on the lower end surface 32. Also good. Thereby, since the light reflected by the lower end surface 32 also enters the light deflection surface 5A, the amount of light emitted from the light deflection surface 5A can be increased. On the other hand, a light absorbing material may be applied to the lower end surface 32 to prevent light reflection at the lower end surface 32. Part of the light reflected by the lower end face 32 leaks outside the light guide plate 3A in the vicinity of the lower end face 32 without being totally reflected by the inner faces 35 'and 36'. By applying a light absorbing material to the lower end face 32, this light can be prevented.

  The light deflection surface 5A is desirably provided at a position where the light emitted from the plurality of light sources 41 intersects in the x direction from the upper end face 31 toward the lower end face 32 (a position separated by a predetermined distance or more). A specific method for deriving the predetermined distance will be described with reference to FIG. It is a figure for demonstrating an example of the derivation | leading-out method of the position which installs 5 A of optical deflection surfaces. FIG. 4 shows a schematic configuration in the vicinity of the light source 41 when a plurality of light sources 41 are arranged in the illumination unit 42 along the y direction. A thin air layer exists between the light source 41 and the upper end surface 31.

  As shown in FIG. 4, adjacent light sources 41 are arranged at an interval of x1 in the x direction. The light emitted from the light source 41 is refracted at the upper end face 31, and the light incident on the upper end face 31 passes through the light guide plate 3 </ b> A with a spread angle (irradiation angle) of θx in the x direction with respect to the z axis. Light guide. When the upper end surface 31 is a plane parallel to the light emitting surface of the light source 41, θx corresponds to a critical angle. At this time, of the light emitted from the adjacent light sources 41, the light having the outermost spread angle intersects at a position away from the upper end face 31 by z1 (z1 = 2 × x1 / tan θx). As shown in FIG. 4, the region whose distance from the upper end surface 31 is less than z1 includes a region where light from the light source 41 is not irradiated. Therefore, when the light deflection surface 5A is provided in this region, unevenness occurs in the light emitted to the outside of the light guide plate 3A by the light deflection surface 5A. Therefore, the light deflection surface 5A is desirably provided at a position where the light from the plurality of light sources 41 intersects, that is, at a position away from the upper end face 31 in the z direction by z1 or more. For this reason, the light source 41 is arranged on the side away from the light polarization plane 5A. For example, when the light polarization plane 5A is provided at a position close to the upper end face 31, the light guide plate 3A can be made uniform by arranging the light source 41 on the lower end face 32 side. It is effective to make it emit light.

  In the above description, the light deflection surface 5A is described as an example, but the light deflection surface 5B is the same as the light deflection surface 5A.

  Further, instead of the light deflection surface 5A, a light deflection structure 6A may be provided as shown in FIG. FIG. 5 is a diagram for explaining how light guided in the light guide plate 3A is deflected by the light deflection structure 6A, and shows an optical path of light guided in the light guide plate 3A. In FIG. 5, for the sake of explanation, a part of the light path of the light beam guided in the light guide plate 3A is schematically shown by a single line. As shown in FIG. 5, the light deflection structure 6 </ b> A has a convex portion (or a concave portion) provided on the back surface 35. The optical path L1 is the same as the optical path L1 shown in FIG.

  As indicated by the optical path L3, when the light incident on the light guide plate 3A enters the convex portion of the light deflection structure 6A, the light is deflected by the convex portion. Thereby, the light is emitted outside the light guide plate 3A without being totally reflected by the inner surface 35 '. At this time, as indicated by the optical path L3a, a part of the light incident on the convex portion of the light deflection structure 6A is emitted to the back surface 35 side without being internally reflected by the convex portion. This is because the incident angle of light with respect to the convex portion does not satisfy the condition of total reflection. Further, as indicated by the optical path L4a, a part of the light incident on the convex portion is internally reflected by the convex portion and then emitted to the surface 34 side without being internally reflected by the inner surface 34 '. This is because the incident angle of light with respect to the inner surface 34 ′ does not satisfy the total reflection condition due to reflection by the convex portion. In this way, the light in the vicinity of the light deflection structure 6A is illuminated by the light emitted to the outside of the light guide plate 3A.

  As described above, as long as the light guided through the light guide plate 3 is deflected to be emitted to the outside of the light guide plate 3, the modes of the light deflection surface 5 and the light deflection structure 6A are not limited to the above. For example, the light guided in the light guide plate 3 may be scattered by making the light emitting region 36 frosted, for example, instead of unevenness of a certain pattern as in the light deflection structure 6A of FIG.

  In the example described above, an example in which two light guide plates 3A and 3B are provided in the depth direction has been described. However, three or more light guide plates may be provided. Specifically, the light source 41, the illumination unit 42, the power supply unit 43, the light guide plate 3, and the light deflection surface 5 may be provided as one set, and a plurality of sets may be provided. The number of sets is determined within a range in which a desired amount of light can be obtained in consideration of attenuation due to light emitted from the light deflection surface 5 provided on one light guide plate 3 being transmitted through another light guide plate 3. Good.

  Further, a set of the light source 41, the illumination unit 42, the power supply unit 43, the light guide plate 3, and the light deflection surface 5 may be arranged in the x direction. For example, FIG. 6 is a front view showing an example in which these sets are arranged in the x direction. As shown in FIG. 6, the lighting unit 42 provided with the light source 41 without providing the window frame side portion 13, the power supply unit 43, the light guide plates 3 </ b> A and 3 </ b> B, and the lighting unit 42 provided with the light source 41. A pair of 'and the power supply unit 43' and the light guide plates 3A 'and 3B' may be arranged in the x direction. At this time, the light guide plates 3A, 3A ', 3B, and 3B' are supported by the window frame upper portion 11 and the window frame lower portion 12.

  Further, the configuration of the light source 41, the illumination unit 42, and the power supply unit 43 is not limited as long as the light irradiation into the light guide plate 3 can be switched for each light guide plate 3. For example, in the configuration shown in FIG. 2, the illumination unit 42 and the power supply unit 43 may be shared between the light source 41 that irradiates light to the light guide plate 3A and the light source 41 that irradiates light to the light guide plate 3B. . In this case, for example, the recesses 111A and 111B may be provided as a single recess without being provided separately. In the above description, ON / OFF of the light source 41 is switched for each illumination unit 42 provided for each light guide plate 3. Instead, for example, a light source 41 is used by using a mechanism that blocks light such as a light shielding plate. From each of the light guide plates 3 may be selectively incident.

  As described above, the illuminating device according to the present invention deflects part of the light guided by the internal reflection in the light guide plate 3 by the light deflection surface 5 and emits the light to the outside of the light guide plate 3. . The light deflection surface 5 can be provided for each light guide plate 3. Moreover, it is possible to make the installation position, width, or shape of the light guide plates 3A and 3B on the back surface 35 different, or a combination thereof. Since it has such a structure, the illuminating device according to the present invention selectively emits light from the light source 41 for each light guide plate 3, and thus emits light in a different manner for each light guide plate 3 on which light is incident. It becomes possible to make it. Moreover, since the illumination mode is switched by selectively making light from the light source 41 incident on each light guide plate 3, the illumination mode can be switched without changing the light guide plate 3.

DESCRIPTION OF SYMBOLS 1 Window frame 11 Window frame upper part 111 Recessed part 12 Window frame lower part 13 Window frame side part 2A, 2B Circumferential groove 3, 3A, 3B Light guide plate 31 Upper end surface 32 Lower end surface 33 Side part end surface 34 Surface 35, 35A, 35B Back surface 36 Light emission Area 41 Light source 42 Illumination unit 43 Power supply unit 5, 5A, 5B Optical deflection surface 6A Optical deflection structure

Claims (5)

A light source;
At least a pair of light guide plates that have a pair of opposed plate surfaces and guide light from the light source by repeating internal reflection between the pair of plate surfaces;
Light deflection that is provided on at least one of the pair of plate surfaces for each of the light guide plates, and deflects part of the light reflected from the inner surface of the light guide plate to the outside of the light guide plate. Surface,
A lighting device comprising: The light deflection surface is different in position, width, or shape, or a combination thereof for each light guide plate,
The lighting device according to claim 1, wherein the light source has a configuration in which the light is selectively incident on each light guide plate.   The lighting device according to claim 1, wherein the light is totally reflected by inner surfaces of the pair of plate surfaces. The pair of light guide plates are arranged in parallel,
4. The light deflection surface provided on at least one of the light guide plates is provided on a side facing at least one of the other light guide plates. The illuminating device in any one of. A plurality of the light sources are arranged along the end face of the light guide plate, and output the light spreading in the arrangement direction,
5. The illumination according to claim 1, wherein the light deflection surface is provided on a side farther from the light source than a position where light from adjacent light sources intersects for the first time. 6. apparatus.

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