JP6494684B2 - Interior lighting structure and interior lighting method - Google Patents

Description

  The present invention relates to room lighting technology for performing room lighting in a medical room, and more particularly to room lighting technology for enhancing the uniformity of room lighting in a medical room.

  In a medical room such as an operating room or an anatomic room, room lighting is performed centering on a working table such as an operating table or an anatomical table installed on the floor of the room. As a room lighting technique in a medical room, for example, those described in Patent Documents 1 to 3 are known. In the air conditioning and lighting system described in Patent Document 1, a lighting fixture, a human detection sensor, and a dimming control device are provided in each of system ceiling modules that constitute each section of a system ceiling (grid ceiling) partitioned in a grid shape. The light control apparatus is configured to control the lighting apparatus (refer to FIGS. 2, 4 and 8 of Patent Document 1). The lighting device for the grid ceiling described in Patent Document 2 is a system in which two lighting fixtures (fluorescent lamps) are arranged in parallel in a grid grid of a predetermined distance from the system ceiling (grid ceiling) (see the patent document 2) 1, see Figure 7). The lighting device for grid ceilings described in Patent Document 3 is a device in which lighting devices are arranged so as to straddle two grids.

  On the other hand, in the medical room, in order to keep the air in the room clean, a rectangular frame-like hanging wall is installed on the ceiling for the purpose of adjusting the air flow in the room (see, for example, Patent Documents 4 to 7). ). The vertical wall is usually installed on the ceiling surface above the work bench such as the operating table so as to surround the work bench (see, for example, FIG. 1 of Patent Document 7), and is cleaned downward from within the frame of the vertical wall. Keeping the room air clean is performed by blowing out the air and sucking and discharging the air from near the floor or near the ceiling of the wall surface around the room (for example, see FIGS. 1 and 4 of Patent Document 5).

Unexamined-Japanese-Patent No. 2006-125727 JP 2003-173715 A Japanese Patent Application Publication No. 2003-7119 Japanese Utility Model Publication No. 62-6428 Japanese Utility Model Application Publication No. 63-32525 Japanese Utility Model Application Publication No. 3-2273 Japanese Utility Model Application Publication No. 62-14261 Japanese Utility Model Publication No. 56-124428 specification

  In a medical room such as an operating room or an anatomic room, the air flow in the room is adjusted using the above-mentioned vertical wall, but generally, in the ceiling of the vertical wall, various medical facilities as well as air conditioning equipment It is generally performed that a monitor or the like is suspended and disposed (see, for example, FIG. 1 of Patent Document 7). In such a case, it is difficult to widely arrange the luminaire in the hanging wall frame, and the indoor light is disposed so as to surround the hanging wall in the ceiling around the hanging wall.

  However, when the room lighting is arranged to surround the vertical wall, the illuminance at the central portion of the vertical wall necessarily becomes lower than the surrounding. Therefore, the illuminance uniformity in the room becomes large, and there is a problem that the visual condition and the bright and dark in the room are felt large. This is particularly important in the medical room where the operator's large perception of light and dark in the room is an obstacle for performing detailed work, and therefore it is required to maintain the uniformity of the illuminance as much as possible.

  Therefore, it is an object of the present invention to provide an indoor illumination structure and an indoor illumination method capable of securing high uniformity of the illuminance in the room in a medical room provided with a rectangular frame-shaped vertical wall for air conditioning on the ceiling. It is in.

A first configuration of the indoor illumination structure according to the present invention is an indoor illumination structure for illuminating the interior of a medical room,
A translucent plate vertical wall which is vertically suspended from a ceiling surface and disposed in a rectangular frame shape and is a translucent plate through which light is transmitted;
Base illumination installed on the ceiling surface along the side of a quadrangle concentric with the rectangular frame of the light transmission plate vertical wall, surrounding the entire periphery of the light transmission plate vertical wall;
Between the ceiling surface and the light transmitting plate vertical wall, the light transmitting plate vertical wall is linearly arranged along the upper end surface of the light transmitting plate vertical wall, and from the upper end surface of the light transmitting plate vertical wall And a vertical wall light which is illuminated toward the inside.

  According to this configuration, the light emitted from the vertical wall illumination is emitted mainly from the lower end of the light transmission vertical wall through the inside of the light vertical wall, and as auxiliary illumination in the rectangular frame of the light vertical wall. It is possible to reduce the illuminance uniformity within the rectangular frame of the translucent plate vertical wall. This makes it possible to ensure high uniformity of the illuminance in the room.

  The 2nd structure of the interior lighting structure which concerns on this invention is the said 1st structure, covering the side surface of the upper end part of the said light transmission board vertical wall in the upper end part of the said light transmission board vertical wall, and the said light transmission It has a socket which fixes a board hanging wall to a ceiling surface, and the socket is characterized in that an inner side is a mirror surface.

  According to this configuration, by forming the inner side surface of the socket as a mirror surface, even when a gap is provided between the upper end surface of the light transmitting plate vertical wall and the illumination surface of the vertical wall illumination, optically It is substantially equivalent to the case where the upper end surface of the light transmitting plate vertical wall and the illumination surface of the vertical wall illumination are disposed in close contact with each other. As a result, the apparent directivity of the vertical wall illumination becomes low even with the gap, and the optimization uniformity and the optimization variation coefficient can be suppressed to a low level. In addition, by providing a gap between the upper end surface of the light transmitting plate vertical wall and the illumination surface of the vertical wall illumination, cooling of the vertical wall illumination can be performed using this gap space, and heat dissipation is ensured. It is also possible to prevent the heat deterioration of the vertical wall illumination.

In a third configuration of the indoor lighting structure according to the present invention, in the first or second configuration, the light transmitting plate vertical wall is formed by arranging a plurality of flat light transmitting plates in a rectangular frame shape Yes,
The left and right end surfaces of each of the light transmitting plates constituting the light transmitting plate vertical wall are formed as inclined surfaces, and the inclined surfaces are formed to face the outside of the frame of the light transmitting plate vertical wall. It features.

  With this configuration, it is possible to further reduce the illuminance uniformity in the rectangular frame of the light transmitting plate vertical wall, and it is possible to further enhance the uniformity of the illuminance in the room.

  In a fourth configuration of the indoor lighting structure according to the present invention, in the configuration according to any one of the first to third embodiments, the lower surface of the light transmitting plate vertical wall has an inclined plane, a curved surface, or a center bending surface It is characterized in that it is formed in

  With this configuration, it is possible to further reduce the illuminance uniformity in the rectangular frame of the light transmitting plate vertical wall, and it is possible to further enhance the uniformity of the illuminance in the room.

An indoor illumination method according to the present invention is an indoor illumination method for illuminating a room of a medical room,
A translucent plate vertical wall in which a translucent plate through which light passes is arranged and formed in a rectangular frame shape is vertically suspended from a ceiling surface,
Base illumination is installed on the ceiling surface along a side of a quadrangle concentric with the rectangular frame of the light transmitting plate vertical wall surrounding the entire periphery of the light transmitting plate vertical wall,
Vertical wall illumination for illuminating light from the upper end surface of the transparent plate vertical wall to the inside of the transparent plate vertical wall, between the ceiling surface and the transparent plate vertical wall, of the transparent plate vertical wall Arranged linearly along the upper end face,
The uniformity of the illuminance in the horizontal plane at a predetermined height between 0 m and 1.5 m from the floor surface of the space directly below the convex hull including the base illumination on the ceiling surface is minimized. The illumination ratio of the illumination of the base illumination and the illumination of the vertical wall illumination may be adjusted.

  As described above, according to the present invention, vertical wall illumination is provided between the ceiling surface and the vertical wall of the transparent plate from the upper end surface of the vertical wall of the transparent plate toward the inside of the vertical wall of the transparent plate. Thus, the light emitted from the vertical wall light is emitted mainly from the lower end of the transparent plate vertical wall through the inside of the transparent plate vertical wall, and functions as auxiliary illumination in the rectangular frame of the transparent plate vertical wall, The illuminance uniformity in the rectangular frame of the light transmitting plate vertical wall can be reduced. This makes it possible to ensure high uniformity of the illuminance in the room.

  In addition, by making the inner surface of the socket at the upper end of the light transmitting plate vertical wall a mirror surface, even when a gap is provided between the upper end surface of the light transmitting plate vertical wall and the illumination surface of the vertical wall illumination, This is substantially equivalent to the case where the upper end surface of the light transmitting plate vertical wall and the illumination surface of the vertical wall illumination are disposed in close contact with each other. As a result, the apparent directivity of the vertical wall illumination becomes low even with the gap, and the optimization uniformity and the optimization variation coefficient can be suppressed to a low level. In addition, by providing a gap between the upper end surface of the light transmitting plate vertical wall and the illumination surface of the vertical wall illumination, cooling of the vertical wall illumination can be performed using this gap space, and heat dissipation is ensured. It is also possible to prevent the heat deterioration of the vertical wall illumination.

It is a figure showing the whole structure of the interior lighting structure which concerns on Example 1 of this invention. FIG. 6 is a diagram illustrating the configuration of each light transmitting plate 4 a that constitutes the light transmitting plate vertical wall 4 of the first embodiment. It is a figure which shows the calculation result of the illumination distribution by only the base illumination 6. FIG. It is a figure showing the evaluation model of the light transmission board 4a single-piece | unit. Transparent plate 4a upper surface and 0.1t spacing d _s of the surface light source, in the case of t, 2t, and 5t, is a diagram illustrating a calculation result of the illuminance distribution measuring line for each lower end face inclination angle theta _b. It is a figure which shows the light path which injects into a light transmission board from the upper end surface of a light transmission board. Refractive index n ₁ of 1.5 transparent plate 4a, 1.6, 1.7, in the case of 1.8, a diagram representing the calculation result of the illuminance distribution measuring line for each lower end face inclination angle theta _b. It is a figure showing the change of illumination distribution when changing upper end inclination-angle (theta) _t and lower end inclination-angle (theta) _b in the light transmission board vertical wall 4 of FIG.1 and FIG.2. It is a figure showing the change of the optimization uniformity with respect to the change of inclination angle (theta) _t , (theta) _b of the upper end surface of a light transmission board, and a lower end surface, and an optimization variation coefficient. It is a figure showing the change of the illumination distribution by the space | interval d _s of the upper end surface of a light transmission board, and a surface light source. It is a figure showing the change of the optimization uniformity and the optimization variation coefficient by the space | interval d _s of the upper end surface of a light transmission board, and a surface light source. It is a figure showing the structure which made the inner surface of the socket 7 a mirror surface. It is a figure showing change of illumination distribution at the time of changing interval d _s of a translucent board 4a upper end face and a surface light source in the case where it is a mirror surface, when the inner side of socket 7 is made into a non-reflection surface. Refractive index n ₁ = 1.5 of the transparent plate, 1.6, 1.7, for 1.8 is a graph showing a change in the illuminance distribution when changing the lower end face inclination angle theta _b. It is a figure showing the change of the optimization uniformity and the optimization variation coefficient when the lower end face inclination angle θ _b is changed with respect to the refractive index n ₁ = 1.5, 1.6, 1.7, 1.8 of the light transmitting plate. It is a figure showing each light transmission board which comprises the light transmission board vertical wall and the light transmission board vertical wall in the interior lighting structure which concerns on Example 2 of this invention. In the translucent plate vertical wall 4 of FIG. _{16, θ t = θ b =} 0 °, is a graph showing a change in the illuminance distribution with respect to the change of the inclination angle theta _s side edges inclined surface when the n 1 ₌ 1.5 . Diagram showing changes in (a) optimization uniformity and (b) optimization variation coefficient with respect to the change in inclination angle θ _s of the side edge inclined surface when θ _t = θ _b = 0 ° and n ₁ = 1.5. It is. It is a figure showing each light transmission board which comprises the light transmission board vertical wall and the light transmission board vertical wall in the interior lighting structure which concerns on Example 3 of this invention. In the translucent plate vertical wall 4 of FIG. 19, θ _{t =} 0 °, is a graph showing a change in the illuminance distribution with respect to the change of the inclination angle theta _b of the inclined arcuate surface when the n 1 ₌ 1.5. θ _{t =} 0 °, is a diagram showing changes in (a) optimizing uniformity and (b) optimizing the variation coefficient with respect to a change in the inclination angle theta _b inclined arcuate bottom surface when the n 1 ₌ 1.5 . It is sectional drawing of the lower end part of each light transmission board 4a which comprises the light transmission board vertical wall 4 in the interior lighting structure which concerns on Example 4 of this invention. It is a figure showing the change of the (a) optimization uniformity and the (b) optimization variation coefficient with respect to the change of the relative curvature _{b b} of the horizontal arc lower end face at θ _t = 0 ° and n ₁ = 1.5. . It is sectional drawing of the lower end part of each light transmission board 4a which comprises the light transmission board vertical wall 4 in the interior lighting structure which concerns on Example 5 of this invention. It is a figure showing the change of the (a) optimization uniformity degree and the (b) optimization variation coefficient with respect to the change of outer side inclination angle (theta) ₂ of the folded-plane lower end surface of the light transmission board 4a of FIG. It is a figure showing the change of the (a) optimization uniformity and the (b) optimization variation coefficient in the range of 55 degrees <= (theta) _b2 <= 77.5 degrees. The figure which represents the change of the (a) optimization uniformity degree and the (b) optimization variation coefficient with respect to the change of outside inclination-angle (theta) ₂ of the fold-like lower end surface with respect to each horizontal width x ₁ of the translucent plate 4a of FIG. It is. (A) optimization uniformity degree and (b) optimization variation coefficient with respect to the change of the outer side inclination angle θ ₂ of the lower end face in the case where the refractive index n _{1 of the} light transmitting plate is 1.4 to 1.8 It is a figure showing change of.

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

  FIG. 1 is a diagram showing an entire configuration of an indoor lighting structure according to a first embodiment of the present invention. 1 (a) is a perspective view looking up from the indoor side, FIG. 1 (b) is a perspective view of a light transmitting plate vertical wall removed from a ceiling surface, FIG. 1 (c) is a side view, FIG. ) Represents a plan view. In FIG. 1, a room to be illuminated is a medical room such as an operating room or an anatomic room, and includes a ceiling surface 1, a room wall surface 2, and a floor surface 3. In addition, in FIG. 1 (a), a part of room wall surface 2 is abbreviate | omitted on account of illustration, and a part of floor surface 3 is broken and shown. The indoor lighting structure according to the present invention includes the light transmitting plate vertical wall 4, the socket 5, the base lighting 6, and the vertical wall lighting 7. The light transmitting plate vertical wall 4 is a vertical wall vertically hanging from the ceiling surface 1 and formed by arranging a light transmitting plate 4 a transmitting a plurality of lights in a rectangular frame shape. The light-transmissive plate 4a is made of a transparent material having a high light transmittance, such as a glass or an acrylic plate. The socket 5 is a fixing fitting provided over the entire upper end of the light transmitting plate vertical wall 4, and fixes the light transmitting plate vertical wall 4 to the ceiling surface 1. Both side surfaces of the socket 7 are formed in parallel with both side surfaces of the light transmitting plate 4a. The inner surface of the socket 5 is mirror-finished to reflect light, or a mirror seal is attached. The base lighting 6 is lighting installed on the ceiling surface 1 so as to surround the entire periphery of the light transmitting plate vertical wall 4 and to be installed along the side of a square concentric with the rectangular frame of the light transmitting plate vertical wall 4. The base illumination 6 is an illumination usually used as a ceiling illumination, such as a fluorescent lamp or an LED illumination, in which the light distribution characteristic distribution is substantially uniformly spread in all directions. The vertical wall illumination 7 is linearly arranged along the upper end surface of the light transmission plate vertical wall 4 as shown in FIG. 1 (b). A light that illuminates the interior of the house. As the vertical wall illumination 7, an LED line array or the like in which high brightness LEDs are linearly arranged is used. Each lighting element such as an LED constituting the vertical wall illumination 7 is arranged such that the beam central axis direction is downward (that is, the direction toward the upper end surface of the light transmitting plate vertical wall 4).

In the following description, the horizontal direction of the room to be illuminated is x direction, the vertical direction is y direction, and the vertical direction is z direction. Also, as shown in FIGS. 1 (c) and 1 (d), the width of the room to be illuminated is w _mx , w _my , the height from floor 3 to ceiling 1 is h _m , and base illumination 6 is arranged. The width of the rectangular frame is w _cx , w _cy , the width of the base illumination 6 is w ₁ , the width of the frame of the light transmitting plate vertical wall 4 is w _2x , w _{2 y} , the height of the light transmitting plate vertical wall 4 h ₂ , The thickness of each light transmitting plate 4 a constituting the light transmitting plate vertical wall 4 is denoted by t. In a standard medical room, the height from the floor 3 to the ceiling 1 is set to about 3 _m .

FIG. 2 is a view showing the configuration of each light transmitting plate 4 a constituting the light transmitting plate vertical wall 4 of the first embodiment. Fig.2 (a) is a whole perspective view, FIG.2 (b) is a front view, FIG.2 (c) is a side view. In the present embodiment, the light transmitting plate 4a is a flat plate having a rectangular shape as a whole. The upper end surface and the lower end surface of the light transmitting plate 4a are formed in a horizontal plane or an inclined plane. In the following description, the inclination angle denoted as theta _t with respect to the horizontal plane of the upper end face of the transparent plate 4a, the inclination angle theta _t, as shown in FIG. 2 (c), the rectangular frame of the light-transmitting plate vertical wall 4 The direction inclined upward from inside to outside of the body is taken as the positive direction. Also, noted an inclination angle with respect to the horizontal plane of the lower end surface of the transparent plate 4a and theta _b, the inclination angle theta _b, as shown in FIG. 2 (c), the outside from the inside of the rectangular frame of the light-transmitting plate vertical wall 4 The positive direction is the direction that inclines upward towards. Further, the width of the light transmitting plate 4a is w _p , the height is h ₂ , and the thickness is t. From FIG. 1D, L _1x = 3w _p and L _1y = 4w _p .

  In the indoor illumination structure according to the present embodiment configured as described above, an indoor illumination method using the same will be described below.

  A work table (not shown) such as an operating table or a dissection table is installed on the floor 3 in the room below the frame of the light transmitting plate vertical wall 4. In this state, the base illumination 6 and the vertical wall illumination 7 are turned on to perform indoor illumination around the workbench. Usually, the height from the floor 3 of a work table such as an operating table is 600 to 1000 mm. Therefore, the illuminance reference plane is virtually provided within the range of this height or within the range of 0 to 1.5 m according to the purpose of use of the room, and in the illuminance reference plane, the uniformity of the illuminance around the work bench is minimum. The illuminations of the base illumination 6 and the vertical wall illumination 7 are adjusted to be Here, “uniformity” is defined in JIS-z-9110-2011 (Lighting General Rule) as the ratio of the minimum illuminance to the average illuminance on a certain surface. As another definition, it may be defined as the ratio of the difference between the maximum illumination and the minimum illumination to the average illumination on a certain surface. When adjusting the illuminance of the base illumination 6 and the vertical illumination 7, although the uniformity according to any definition may be used, the latter definition will be used in the present specification. That is, the uniformity ratio U is defined by the following equation.

Here, I (P) is the illuminance of the point P on the illuminance reference plane, A is the illuminance measurement area (area on the illuminance reference plane), and max P _{∈ A} (I (P)) is the illuminance I (P ), Min P _{∈ A} (I (P)) is the minimum value of illuminance I (P) in region A, ave P _{∈ A} (I (P)) is the average value of illuminance I (P) in region A It is. The uniformity is an index that represents local shading of the room illuminance, but in the following description, the illuminance variation coefficient RSD is used as an index that represents the overall shading of the room illuminance. The coefficient of variation RSD is defined by the following equation.

  As described above, illumination is performed by the vertical wall illumination 7 from the upper end surface of the transparent plate vertical wall 4 through the transparent plate vertical wall 4 so that the illuminance in the frame of the transparent plate vertical wall 4 is the illuminance around the frame It becomes possible to equalize the

  Next, the result of the evaluation of how much the illuminance in the room is made uniform by actually illuminating with the vertical wall illumination 7 through the light transmitting plate vertical wall 4 of FIGS. 1 and 2 will be described. . As an evaluation method, first, evaluation of the illuminance distribution by only the base illumination 6 and evaluation of the illuminance distribution by only the vertical wall illumination 7 are performed, and then, the improvement degree of uniformity and variation coefficient in the case of overlapping both evaluate. The evaluation of the illuminance was performed by numerical calculation by the ray tracing method.

(1) Evaluation of illuminance distribution by base lighting 6 In calculating the illuminance, assuming the size of a standard medical room, the width of the room to be illuminated is set to w _mx × w _my = 6 as the size parameter of FIG. 5 x 8 m, height from floor surface 3 to ceiling surface 1 h _m = 3 m, width of rectangular frame on which base lighting 6 is arranged w _cx x w _cy = 4.79 x 5. 24 m, base lighting 6 The width is w ₁ = 0.3 m, the width of the frame of the translucent plate vertical wall 4 is w ₂ x × w _{2 y} = 1.6 x 2.4 m, the height of the translucent plate vertical wall 4 h ₂ = 0.3 m The thickness of each light transmitting plate 4 a constituting the light transmitting plate vertical wall 4 was set to t = 10 mm. Light distribution curve of the base lighting 6 varies depending luminaires to be used, here, as a standard model, the base illumination 6 is an ideal surface light source, the orientation curve _{I s (θ) = I s0} cosθ And Here, θ represents an angle with respect to a normal vector (vector directed downward in the vertical direction) of the base illumination 6. As the illuminance reference surface, a horizontal surface 70 cm in height from the floor surface (horizontal surface at a distance of 2 m from the lower end surface of the light transmitting plate vertical wall 4) was used as the illuminance reference surface. In addition, since the reflection by the peripheral wall surface and the floor surface of the room is variously different depending on the material constituting the wall surface and the floor surface, the reflection by the peripheral wall surface and the floor surface is not considered in this evaluation.

  FIG. 3 is a view showing the calculation result of the illuminance distribution by only the base illumination 6. In FIG. 3, in the frame line indicated by a black line, the outer frame line indicates the position of the base illumination 6 on the ceiling surface, and the inner rectangular frame line indicates the position of the light transmission plate vertical wall 4 (See FIG. 1 (d)). It can be seen from FIG. 3 that when illumination is performed only by the base illumination, a dark portion is generated in the frame of the light transmitting plate vertical wall 4. At this time, the uniformity U (A) of the area A (the area surrounded by the alternate long and short dash line in FIG. 3) within the frame of the base illumination 6 (within the convex hull including all the outer sides of the frame of the base illumination 6) and The variation coefficient RSD (A) was U (A) = 0.619 and RSD (A) = 0.163.

(2) Evaluation of illuminance distribution by the light transmitting plate 4a alone Next, a result of evaluating the illuminance distribution by the light transmitting plate 4a alone will be described. FIG. 4 is a diagram showing an evaluation model of the light transmitting plate 4a alone. The shape of the transparent plate 4a is the same as FIG. 2, above the upper end surface of the transparent plate 4a, an interval of distance d _s, placing a surface light source having the same width as the transparent plate 4a. Here, the light distribution curve of the surface light source has a constant value (isotropic light source) in all directions. Further, a shielding plate was set as a substitute for the socket 5 between the surface light source and the upper end surface of the light transmitting plate. The illuminance reference surface was a horizontal surface at a position at which the distance h _m from the lower end of the light transmission plate 4a is 2 _m . As shown in FIG. 4B, on this illuminance reference surface, a point immediately below the center point of the light transmission plate 4a is taken as the origin, and a direction perpendicular to the width direction of the light transmission plate 4a is the x axis A coordinate axis with a direction of z-axis was set, and the calculation of illuminance was performed along the x-axis. In addition, inclination-angle (theta) _t of the upper end surface of the light transmission board 4a was 0 degree.

Figure 5 is a diagram showing a transparent plate 4a upper surface and 0.1t spacing d _s of the surface light source, in the case of t, 2t, and 5t, the calculation result of the illuminance distribution measuring line for each lower end face inclination angle theta _b It is. According to FIG. 5, as the distance d _s between the upper end surface of the light transmission plate 4 a and the surface light source becomes larger, the peak of the illuminance value is inward (x <0) than the position (x = 0) directly below the light transmission plate 4 a. It is understood that it shifts. Moreover, in the outer side (x> 0) of a light transmission board, the tendency for the vibration of an illumination value to be large is seen. The reason is considered as follows.

FIG. 6 is a view showing an optical path which enters the light transmitting plate from the upper end surface of the light transmitting plate. As shown in FIG. 6A, of the light beams incident on the upper end of the light transmission plate from the surface light source, the end of the surface light source is the end opposite to the upper end surface of the light transmission plate as shown in FIG. In this case, the incident angle is θ _s0 . From FIG. _6A , θ _s0 = arctan (t / d _s ). When this light beam is incident into the light transmission plate, the light path is refracted and the transmission angle becomes θ _s . Assuming that the refractive index of the light transmitting plate is n ₁ , the transmission angle θ _s is expressed by the following equation.

Here, θ _c = asin (1 / n ₁ ) is a critical angle. After the light ray intrudes into the light transmission plate, it is incident on the inner surface of the light transmission plate. Assuming that the incident angle at this time (hereinafter referred to as “minimum side incident angle”) is θ ₁ , θ ₁ = π / 2−θ _s from FIG. 6A. If the critical angle θ _c is smaller than π / 4, then θ ₁ > θ _c always holds, and all the optical paths are totally reflected by the inner surface of the light transmission plate. Therefore, the maximum number N of reflections of light reflected from the upper end face to the lower end face of the light transmission plate at the inner side surface of the light transmission plate is expressed by the following equation.

In particular, when d _s = 0, θ _s = θ _c , and the minimum side incident angle is θ ₁ = π / 2−θ _c . From equations (3) and (4), as d _s increases, θ _s decreases, the minimum side incident angle θ ₁ increases, and the maximum number of reflections N decreases. This means that as d _s increases, the apparent light source directionality of the incident beam will be higher. Accordingly, since the dispersion of the optical path due to the reflection in the light transmitting plate is reduced, the influence of the zig-zag reflection in the light transmitting plate is reduced, and it is considered that only the influence of the light path heading further downward remains. In the case of an optical path traveling downward in the vertical direction, as shown in FIG. 6 (b), the light is refracted inward (leftward in FIG. 6 (b)) at the lower end face of the light transmitting plate and then toward the floor. It is irradiated. At this time, in the case where the lower end face of the light transmitting plate is inclined upward from the inside (left side in FIG. 6B) to the outside (right side in FIG. 6B) (when θ _b > 0) The light is refracted inward. Therefore, when d _s increases and directivity is enhanced, and the influence of the optical path traveling in the vicinity of the vertically downward direction becomes large, the peak of the illuminance shifts inward as shown in FIG. Also, as the d _s increases, the zig-zag light path with a small side reflection angle decreases and only the limited zig-zag light path with a large side reflection angle remains, so it is thought that the vibration in the illuminance distribution increases as the d _s increases. Be

7, the refractive index n ₁ of 1.5 transparent plate 4a, 1.6, 1.7, in the case of 1.8, a diagram representing the calculation result of the illuminance distribution measuring line for each lower end face inclination angle theta _b. According to FIG. 7, as the refractive index of the light transmitting plate 4a increases, the peak of the illuminance value may be shifted inward (x <0) with respect to the position (x = 0) directly below the light transmitting plate 4a. I understand. Moreover, in the outer side (x> 0) of a light transmission board, the tendency for the vibration of an illumination value to be large is seen. This tendency is more widened distance d _s of the transparent plate 4a upper surface and the surface light source appears large, it appears larger as the inclination angle theta _b of the transparent plate 4a bottom surface increases.

(3) Evaluation of illuminance distribution by the entire light transmitting plate vertical wall 4 (3.1) Evaluation of the influence of the inclination of the upper end surface and the lower end surface of the light transmitting plate The influence of the entire wall 4 on the illuminance distribution will be described. Figure 8 is a graph showing a change in the illuminance distribution when changing the upper end face inclination angle theta _t and the lower end face inclination angle theta _b of the transparent plate 4a in the translucent plate vertical wall 4 of FIG. 1 and FIG. 2 . Each illuminance distribution map in the table of FIG. 8 is shown in the same size as FIG. In FIG. 8, the refractive index _{n 1} of the transparent plate 4a is 1.5, distance _{d s} of the transparent plate 4a upper surface and the surface light source is set to 0.1 t. Further, as the illuminance reference surface, a horizontal surface 70 cm in height from the floor surface (horizontal surface at a distance of 2 m from the lower end surface of the light transmitting plate vertical wall 4) is used as the illuminance reference surface. In the upper end face inclination angle θ _t and the lower end face inclination angle θ _b , the direction inclining upward from the inside of the frame of the light transmitting plate vertical wall 4 toward the outside of the frame is positive and the direction inclined downward is negative (FIG. c) see In addition, assuming that the light distribution distribution curve of the vertical wall illumination 7 is LED illumination, the illuminance is a Gaussian curve (I (θ _s0 ) = I ₀ · exp (−) with respect to the direction of the angle θ _s0 from the illumination axis direction. It was set to be αθ _s0 ² )). From FIG. 8, by changing the upper end face inclination angle theta _t and the lower end face inclination angle theta _b of the transparent plate 4a, it can be seen that it is possible to control the illuminance distribution on the illumination reference plane.

Next, it is considered to minimize the uniformity by superposing the illumination by the vertical wall illumination 7 through the light transmitting plate vertical wall 4 (hereinafter referred to as “auxiliary illumination”) and the illumination of the base illumination 6. Now, it is assumed that the illuminance of the base illumination at a point P (x, y) on the illuminance reference plane is I ₀ (P), and the illuminance of the auxiliary illumination is I ₁ (P). When the base illumination and the auxiliary illumination are turned on at the same time, it is assumed that the linear superposition is established on the assumption that the light interference due to both illuminations is negligible. At this time, the total illuminance I (P) at the point P (x, y) is expressed by the following equation.

Here, w ₀ and w ₁ are weighting factors. The uniformity factor U of equation (1) and the coefficient of variation RSD of equation (2) are used as indices for measuring the uniformity of the illuminance on the illuminance reference surface. As the area A for measuring the uniformity U and the variation coefficient RSD, in the frame of the base illumination 6 (all of the frames of the base illumination 6 as shown by the one-dot chain line frame in FIG. 3) In the convex hull including the outer side of Further, for simplicity, w ₀ = 1 and the weighting coefficient w ₁ is changed to obtain the weighting coefficient w _{1, min} which minimizes the uniformity factor U of the illuminance in the region A or the variation coefficient RSD. The uniformity U (w1 _{, min} ) or the variation coefficient RSD (w1 _{, min} ) is determined. The uniformity ratio U (w1 _{, min} ) is called "optimization uniformity", and the variation coefficient RSD (w1 _{, min} ) is called "optimization variation coefficient".

FIG. 9 is a diagram showing changes in the optimization uniformity and the optimization variation coefficient with respect to changes in the inclination angles θ _t and θ _b of the upper end surface and the lower end surface of the light transmitting plate 4a. 9, the refractive index _{n 1} of the transparent plate 4a is 1.5, distance _{d s} of the transparent plate 4a upper surface and the surface light source is set to 0.1 t. From FIG. 9, it is possible to suppress the optimization uniformity factor U and the optimization variation coefficient RSD low by setting the range of θ _b = 0 to -40 degrees in the range of θ _t = -10 to 30 degrees. . In addition, since the uniformity in the case of only the base light source is 0.619 and the variation coefficient is 0.163, according to FIG. 9, the uniformity is about 60% and the variation coefficient is about 40% by using the auxiliary light source. Can be reduced to Incidentally, the inclination angle theta _b of the lower end surface of the transparent plate 4a is smaller than -40 degrees, the weighting factor for the optimization increases. This means that high illumination is required at the auxiliary light source, which is less preferred. Further, when the inclination angle θ _t of the upper end surface of the light transmitting plate 4a is -10 to 10 degrees, the most uniform and excellent uniformity can be obtained. In this case, the inclination angle θ _b of the lower end surface is -40 to 40 The optimization uniformity U and the optimization variation coefficient RSD can be kept low in the range of degrees.

(3.2) Evaluation Figure 5 Effect of distance d _s of the upper end surface and the surface light source of the transparent plate, as described in FIG. 6, the distance d _s between the upper surface and the surface light source of the transparent plate 4a If it becomes larger, the apparent directivity of the light source (perpendicular wall light 7) will be higher, so it is considered that the optimization uniformity and the optimization variation coefficient will also be affected. Therefore, the influence of the distance d _s between the upper end surface of the light transmitting plate 4a and the surface light source was evaluated. FIG. 10 is a diagram showing a change in illuminance distribution according to the distance d _s between the upper end surface of the light transmitting plate and the surface light source. FIG. 10 (a) shows the lower end inclination angle θ _b dependency of the illuminance distribution when d _s = 0.1 t, 1.0 t (n = 1.5, θ _t = 0 degrees), and FIG. 10 (a) is This shows the interval d _s dependency of the illuminance distribution when θ _b = θ _t = 0 degrees (n = 1.5). As shown in FIG. 10, the greater the distance d _s, since the apparent directional light sources (vertical wall lighting 7) is increased, the illuminance distribution, the shape of the spacing d _s is larger the light-transmitting plate vertical wall 4 Is more strongly reflected. FIG. 11 is a diagram showing changes in the optimization uniformity and the optimization variation coefficient according to the distance d _s between the upper end face of the light transmission plate and the surface light source. 11 (a) and 11 (b) show optimization uniformity and optimization variation coefficient lower end inclination angle θ _b dependency at d _s = 0.1 t, 1.0 t (n = 1.5, θ _t = 0 degrees) 11 (c) and (d) show the dependence _ds on the optimization uniformity and the optimization variation coefficient when θ _b = θ _t = 0 degrees (n = 1.5). It can be seen from FIG. 11 that as the distance d _s between the upper end surface of the light transmitting plate and the surface light source becomes larger, the optimization uniformity and the optimization variation coefficient become larger, and the uniformity of the illuminance decreases.

  From the above results, in order to improve the uniformity of the illuminance, the irradiation surface of the vertical wall illumination 7 may be disposed in close contact with the upper end surface of the light transmitting plate 4a. However, in the actual vertical wall illumination 7, in order to obtain sufficient brightness, an LED array in which a large number of high brightness LEDs are linearly arranged is used. Therefore, if the vertical wall light 7 is disposed in close contact with the upper end surface of the light transmitting plate 4 a, the heat dissipation property may be deteriorated, and the vertical wall light 7 may be deteriorated. Also, in the LED array, high brightness LEDs are arranged at regular intervals, and unlike an ideal continuous surface light source, it is a discrete light source.

Therefore, in the present invention, as shown in FIG. 12, the inner side surface of the socket 7 which covers the side surface of the upper end portion of the light transmitting plate vertical wall 4 and fixes the light transmitting plate vertical wall 4 to the ceiling surface I assume. As a result, even if the distance d _s between the upper end surface of the light transmitting plate 4a and the surface light source is increased, the state where the irradiation surface of the vertical wall illumination 7 is in close contact with the upper end surface of the light transmitting plate 4a Are substantially the same. Therefore, the apparent directivity of the light source (vertical wall illumination 7) is low, and the optimization uniformity and the optimization variation coefficient can be suppressed low. Further, by separating the irradiation surface of the vertical wall light 7 from the upper end surface of the light transmission plate 4a, the space between the light irradiation surface of the vertical wall light 7 and the upper end surface of the light transmission plate 4a can be ventilated. It is also possible to cool the vertical wall illumination 7 utilizing space. Furthermore, even if the vertical wall illumination 7 is a discrete light source such as an LED array, it is an ideal continuous surface by separating the irradiation surface of the vertical wall illumination 7 from the upper end surface of the light transmission plate 4a by a fixed distance. It becomes possible to bring it closer to the light source. FIG. 13 shows a change in illuminance distribution when the distance d _s between the upper end surface of the light transmitting plate 4a and the surface light source is changed when the inner side surface of the socket 7 is a non-reflecting surface and when it is a mirror surface. According to FIG. 13, by making the inner side surface of the socket 7 a mirror surface, even if the distance d _s between the upper end surface of the light transmission plate 4 a and the surface light source is large, the irradiation surface of the vertical wall illumination 7 is made of the light transmission plate 4 a. It can be seen that it can be brought close when arranged in close contact with the upper end face.

(3.3) to evaluate the end of the influence of refractive index n ₁ of the transparent plate, a refractive index n ₁ of the transparent plate 4a will be described influence on the illuminance distribution. As described in FIG. 7, when the lower end surface of the light transmission plate 4 a is inclined, when the refractive index n ₁ of the light transmission plate 4 a is increased, the illuminance is maximized in the direction opposite to the direction of the inclined surface. Peak shifts. Therefore, when the light transmitting plate vertical wall 4 is configured with the light transmitting plate 4a as a rectangular frame, when the lower end surface of the light transmitting plate 4a is inclined upward in the outer direction of the frame, If the refractive index n ₁ of the optical plate 4a becomes larger, considered light is focused more toward the center of the frame. 14, the refractive index n ₁ = 1.5 of the transparent plate, 1.6, 1.7, for 1.8 shows the change in the illuminance distribution when changing the lower end face inclination angle theta _b. 15, the refractive index n ₁ = 1.5 of the transparent plate, 1.6, 1.7, for 1.8 shows the change in the optimization uniformity and optimization variation coefficient with respect to a change in the lower end face inclination angle theta _b. In the optimization uniformity and the optimization variation coefficient, the difference due to the refractive index does not appear much when the lower end surface inclination angle θ _b is small in the range of −30 ° ≦ θ _b ≦ 30 °, but the absolute value of the lower end surface inclination angle When | θ _b | exceeds 30 °, the difference due to the refractive index is remarkable. This is because, when | θ _b | exceeds a certain size, the light traveling downward in the light transmission plate 4 a is totally reflected by the lower end inner surface of the light transmission plate 4 a and transmitted through the side surface near the lower end of the light transmission plate 4 a It is thought that this is because it is emitted outside. The condition in which light traveling vertically downward in the light transmitting plate 4a is totally reflected by the lower end inner surface of the light transmitting plate 4a is | θ _b | | θ _c = arcsin (1 / n ₁ ). Here, θ _c is a critical angle of the light transmitting plate 4 _c . The critical angles θ _{c at} n ₁ = 1.5, 1.6, 1.7, 1.8 are 41.81 °, 38.68 °, 36.03 °, 33.74 °, respectively. Thus, from FIG. 15, in the theta _b negative side (when inclined from the inside of the transparent plate vertical wall 4 downwards towards the outside), optimizing uniformity and optimization variation coefficient starts rapidly increases It can be seen that the angle is approximately near the critical angle θ _c . Therefore, it is understood that the inclination angle of the lower end face of the light transmitting plate 4c may be set so as to satisfy 0 bθ _b > −θ _c . On the other hand, the side of θ _b > 0 is somewhat complicated. Considering the light traveling vertically downward in the light transmission plate 4c for simplicity, assuming that the critical angle θ _c is larger than 45 °, when θ _b <45 °, the light travels downward in the light transmission plate 4c The light is reflected and refracted at the lower end surface of the light transmitting plate 4c, and the transmitted light is emitted from the lower end surface of the light transmitting plate 4c and travels to the inside of the light transmitting plate vertical wall 4 (see FIG. 6B). At this time, since the reflected light is directed from the horizontal to the upper side, it is not related to the illuminance distribution on the illuminance reference surface. In the case of 45 ° ≦ θ _b <θ _c , the reflected light is also refracted by the inner surface near the lower end of the light transmitting plate 4 c and then directed to the inside of the light transmitting plate vertical wall 4. It may be related to the illuminance distribution on the illuminance reference surface. In the case of θ _c ≦ θ _b , the light traveling vertically downward in the light transmission plate 4 c is totally reflected by the lower end inner surface of the light transmission plate 4 c and is refracted by the inner side surface near the lower end of the light transmission plate 4 c Afterward, it goes to the inside of the light transmitting plate vertical wall 4. At this time, the incident angle theta ₁ is θ _{1 =} 90 ° -θ _b, the refraction angle theta ₂ when the light reflected by the lower end inner surface of the transparent plate 4c is refracted at the inner surface of the transparent plate. 4c theta ₂ = Arcsin (n ₁ cos θ _b ). _{Then, tanθ 2 <h b / w} (h b of the lower end of the transparent plate 4a to illuminance reference plane height, w is the width or height of the frame of the light-transmitting plate vertical wall 4) When the transmitted light Is dispersed to the outside of the frame on the opposite side beyond the position of the light transmitting plate opposite to the light transmitting plate of the radiation source, and when tan θ ₂ > h _b / w, the transmitted light is in the frame of the light transmitting plate vertical wall 4 It is collected. That is, considering only light traveling vertically downward in the light transmission plate 4c, the lower end surface inclination angle θ _b is

In the range of the light is distributed to the outside the frame of the transparent plate vertical wall 4, the lower end face inclination angle theta _b

In the range of (1), light is condensed toward the inside of the frame of the light transmitting plate vertical wall 4. In practice, the angle θ _{o with} respect to the vertically downward direction vector of light traveling from the upper end face to the lower end face in the light transmitting plate is distributed within the range of −θ _s ≦ θ _o ≦ θ _s (where θ _s is (3), the range dispersed to the outside of the frame of the light transmitting plate vertical wall 4 and the range condensed to the frame of the light transmitting plate vertical wall 4 are shifted by the spread of the angle θ _o Do. As a result, as shown in FIG. 15, the optimization uniformity and optimization variation coefficient indicates a complex changes depending on the refractive index n ₁ in the vicinity of θ _{b =} θ _c. From 9 and 15, regardless of the refractive index n ₁ of the transparent plate 4c, when the lower end face inclination angle theta _b is theta _{b <0,} the lower end surface of the transparent plate 4c is compared with the horizontal, The optimization uniformity and the optimization variation coefficient become smaller. Therefore, from the above examination, in the case of using the light transmitting plate 4c having the shape of FIG. 2, the inclination angle θ _b of the lower end surface of the light transmitting plate 4c is −θ _c = arcsin (1 / n ₁ ) <θ _b A range of <0 is considered to be preferable.

FIG. 16 is a view showing each light transmitting plate constituting the light transmitting plate vertical wall and the light transmitting plate vertical wall in the indoor lighting structure according to the second embodiment of the present invention. 16 (a) is a whole perspective view of the light transmitting plate vertical wall 4, FIG. 16 (b) is a plan view of the light transmitting plate vertical wall 4, and FIG. 16 (c) is a plan view of the light transmitting plate 4a. In FIG. 16, the socket 5 and the vertical wall illumination 7 are not shown for the convenience of description. Moreover, the whole structure of the interior lighting structure shall be the same as that of FIG. The light transmission board vertical wall 4 in the interior lighting structure of a present Example arrange | positions several flat light transmission board 4a in rectangular frame shape, and is formed. The left and right end surfaces of each light transmission plate 4a are formed into inclined surfaces, and the inclined surfaces (hereinafter referred to as "side edge inclined surfaces") are arranged and directed to the outside of the rectangular frame of the light transmission plate vertical wall 4. It is done. As shown in FIGS. 16 (b) and 16 (c), the angle formed by the side edge inclined surface with respect to the vertical line of the wide surface (front and back surface) of the light transmitting plate 4a is denoted as θ _s. Call it Hereinafter, the influence of the inclination angle θ _s of the side edge inclined surface on the optimization uniformity and the optimization variation coefficient will be described.

FIG. 17 shows the change of the illuminance distribution with respect to the change of the inclination angle θ _s of the side edge inclined surface at θ _t = θ _b = 0 ° and n ₁ = 1.5 in the light transmitting plate vertical wall 4 of FIG. FIG. Further, FIG. 18 shows (a) optimization uniformity and (b) optimization variation with respect to the change of the inclination angle θ _s of the side edge inclined surface when θ _t = θ _b = 0 ° and n ₁ = 1.5. It is a figure showing the change of a coefficient. From FIG. 17, when the inclination angle θ _s of the side edge inclined surface is 55 degrees, the illuminance is concentrated most at the center. The overall illuminance distribution is maintained in a broad spread state around the center. Optimization uniformity and optimization coefficients of variation, as shown in FIG. 18, the inclination angle theta _s is at 52 degrees to 57 degrees, optimizing uniformity and optimization coefficient of variation is minimized. This is because light traveling obliquely inside the light transmitting plate 4 a in the width direction of the light transmitting plate 4 a is totally reflected by the side edge sloped surface of the light transmitting plate 4 a and directed into the rectangular frame of the light transmitting plate vertical wall 4 Is changed.

  As described above, the left and right end surfaces of each light transmitting plate 4a constituting the light transmitting plate vertical wall 4 are formed as inclined surfaces (side edge inclined surfaces), and the side edge inclined surface is a rectangular frame of the light transmission plate vertical wall 4 The indoor illumination is performed by combining the base illumination 6 and the auxiliary illumination using the vertical illumination 7 as a light source, thereby further reducing the illumination uniformity of the room and achieving the illumination uniformity. It is possible to enhance. In the present embodiment, the number of light transmitting plates 4a constituting the light transmitting plate vertical wall 4 is 2 × 3. However, the number of light transmitting plates 4a is not limited to this. By increasing the number of light transmitting plates 4a constituting the light transmitting plate vertical wall 4, it is possible to enhance the light collecting effect of the side edge sloped surface and to further improve the uniformity of the indoor lighting.

FIG. 19 is a view showing each light transmitting plate constituting the light transmitting plate vertical wall and the light transmitting plate vertical wall in the indoor lighting structure according to the third embodiment of the present invention. 19 (a) is a perspective view of the entire light transmitting plate vertical wall 4, FIG. 19 (b) is a perspective view of each light transmitting plate 4a constituting the light transmitting plate vertical wall 4, and FIG. 19 (c) is a light transmitting plate It is sectional drawing of the lower end part of 4a. In FIG. 19, the socket 5 and the vertical wall illumination 7 are not shown for convenience of explanation. Moreover, the whole structure of the interior lighting structure shall be the same as that of FIG. In the present embodiment, the lower end portion of the light transmitting plate 4a is formed to have an inclined arc shape in cross section. As shown in FIG. 19 (c), referred to as the tangent of the angle of the inclined circular arc in the lowermost end of the transparent plate 4a and the inclined angle theta _b. The tangent of the upper end portion of the inclined arc is assumed to be parallel to the side surface of the light transmission plate 4a. Also, if the inclined arc surface of the lower end of the transparent plate 4a is arranged KakuToruhikariban 4a to face outside the frame of the light-transmitting plate vertical wall 4, it represents the inclination angle theta _b a positive value, the transparent plate 4a If inclined arcuate surface of the lower end is arranged KakuToruhikariban 4a to face the frame of the light-transmitting plate vertical wall 4, and represent the tilt angle theta _b negative value. Hereinafter, the inclination angle theta _b of the inclined arc surface of the transparent plate 4a bottom to describe the effect on the optimization uniformity and optimization coefficient of variation.

Figure 20 is a graph showing a change in the illuminance distribution on the light-transmitting plate vertical wall 4, for θ _{t =} 0 °, the change of the inclination angle theta _b of the inclined arcuate surface when the n 1 ₌ 1.5 in FIG. 19 . FIG. 21 shows changes in (a) optimization uniformity and (b) optimization variation coefficient with respect to the change in the inclination angle θ _b of the inclined arc lower end face when θ _t = 0 ° and n ₁ = 1.5. FIG. In FIG. 21, the data of “outer arc” is the data when each light transmitting plate 4 a is arranged such that the inclined arc surface faces the outside of the frame of the light transmitting plate vertical wall 4, and the data of “inner arc” is the inclined arc It is data when each light transmission board 4a is arrange | positioned so that a surface may face in the frame of the light transmission board vertical wall 4. FIG. The data of "inclined plane" is data in the case where the light transmitting plate 4a is in the shape of the inclined surface of FIG. 2 and is provided for comparison and reference. It can be understood from FIG. 21 that the optimization uniformity and the optimization variation coefficient can be reduced and the uniformity of the illuminance can be further improved by setting the lower end surface of the light transmitting plate 4a as the inclined arc surface. In particular, by arranging each light transmission plate 4 a so that the inclined arc surface faces out of the frame of the light transmission plate vertical wall 4 and setting the inclination angle θ _b of the inclined arc surface to 30 to 40 °, the optimization uniformity and The optimization variation coefficient can be reduced the most, and the uniformity of the illumination is most improved.

FIG. 22 is a cross-sectional view of the lower end portion of each light transmitting plate 4a constituting the light transmitting plate vertical wall 4 in the indoor lighting structure according to the fourth embodiment of the present invention. The structure of the lower end portion is the same as in FIGS. In the present embodiment, the lower end surface is formed in a horizontal arc shape. In FIG. 22, the radius of curvature of the lower horizontal arc surface E _b1 E _b0 E _b2 is denoted as r _b . r _b can take range is _{r b ∈ [0.5t, ∞)} . When r _b = ∞, the lower end surface of the light transmitting plate 4 a is a horizontal surface, and when r _b = 0.5 t, the lower end surface of the light transmitting plate 4 a is a semicircular arc surface. Further, a horizontal arcuate surface _E b1 _E b0 value t / _{r b} multiplied by the thickness t of the transparent plate 4a to the curvature 1 / _{r b} of _{E b2} referred to as referred to as kappa _b "relative curvature". The range that the relative curvature _{b b} can take is κ _b ∈ [0, 2]. When κ _b = 0, the lower end face of the light transmitting plate 4 a is a horizontal surface, and when _{b b} = 2, the lower end face of the light transmitting plate 4 a Is a semicircular surface. FIG. 23 shows the change in (a) optimization uniformity and (b) optimization variation coefficient with respect to the change in relative curvature _{b b} of the horizontal arc lower end face when θ _t = 0 ° and n ₁ = 1.5. FIG. According to FIG. 23, when the lower end face is formed into a horizontal arc, the optimization uniformity and the optimization variation coefficient are reduced by setting the relative curvature _{b b} to about 2, that is, a semicircular shape, and the illuminance is uniformed. It can be seen that the sex can be further improved.

FIG. 24: is sectional drawing of the lower end part of each light transmission board 4a which comprises the light transmission board vertical wall 4 in the interior lighting structure which concerns on Example 5 of this invention. The structure of the lower end portion is the same as in FIGS. In the present embodiment, the lower end surface is formed in a folded surface shape center-folded around a broken line parallel to the width direction of the light transmitting plate 4a. The shape of the lower end folded surface may be either convex upward or convex downward. In FIG. 24, let the side of x <0 (left side) be the frame inside (inner side) of the light transmitting plate vertical wall 4 and the side of x> 0 (right side) be the frame outside (outside) of the light transmitting plate vertical wall 4. Referred the two single slope surface forming a lower refracting surface, _b1 inclination angle with respect to the horizontal plane theta inner piece inclined surface _E b0 _{E b1,} and the inclination angle with respect to the horizontal plane of the outer single slope surface _E b0 _{E b2} θ _b2 . In the inclination angles θ _b1 and θ _b2 , as shown in FIG. 24, the upward direction is positive and the downward direction is negative. Further, the horizontal width of the inner one-side inclined surface E _b0 E _b1 is denoted as x ₁ , and the horizontal width of the outer one-side inclined surface E _b0 E _b2 is denoted as x ₂ .

FIG. 25 is a diagram showing changes in (a) optimization uniformity and (b) optimization variation coefficient with respect to changes in the outer side inclination angle θ ₂ of the lower surface of the light-transmissive plate 4 a of FIG. In Figure 25, the upper end face of the transparent plate 4a is a horizontal surface, the refractive index _{n 1} is set to 1.5. When θ _b1 = θ _b2 = 0, the lower end surface is a horizontal plane, and when θ _b1 = θ _b2 , the lower end surface is the inclined plane of the first embodiment. From FIG. 25, it can be seen that the optimization uniformity and the optimization variation coefficient can be reduced as a whole by setting the inside inclination angle θ _b1 to be in the range of more than 0 ° and 30 ° or less. In addition, the optimization uniformity and the optimization variation coefficient can be reduced by setting the outside inclination angle θ _b2 to be smaller than 0 degree and larger than -40 degrees, as compared to the case where the lower end surface is a horizontal plane. Also, even when the inner inclination angle θ _b1 is 20 degrees or less and the outer inclination angle θ _b2 is in the range of 60 ° ≦ θ _b2 ≦ 72 °, the optimization uniformity and the optimization variation coefficient are greatly reduced. it can. In this case, the outer side inclined surface E _{b 0} E _{b 2} is a total reflection surface, and the light traveling downward in the light transmitting plate 4 a is mostly totally reflected by the outer side inclined surface E _{b 0} E _{b 2} and the inner side inclined surface E _b0 towards the E _b1, is reflected and refracted by the inside piece inclined surface _E b0 _{E b1,} the light transmitted through the inner piece inclined surface _E b0 _{E b1} is radiated to the outside of the transparent plate 4a, the transparent plate vertical wall 4 It is considered to be collected in the frame of FIG. 26 is a diagram showing changes in (a) optimization uniformity and (b) optimization variation coefficient in the range of 55 ° ≦ θ _b2 ≦ 77.5 °. It is understood from FIG. 26 that the range of −20 ° ≦ θ _b1 ≦ 20 ° is appropriate as the range of the inner inclination angle θ _b1 , and in particular, the range of 0 ° ≦ θ _b1 ≦ 20 ° is optimal.

It will be described effects of the horizontal width _{x 2} of the horizontal width _{x 1} and the outer piece inclined surface _E b0 _{E b2} of the inner piece inclined surface _E b0 _{E b1.} FIG. 27 shows (a) optimization uniformity and (b) optimization variation coefficient with respect to the change of the outer side inclination angle θ ₂ of the lower end of the folded surface with respect to each horizontal width x ₁ of the light transmitting plate 4 a of FIG. It is a figure showing change. t is the thickness of the light transmitting plate 4a. From FIG. 27, the optimization uniformity is most improved when x ₁ = 0.4t to 0.5t, and it can be seen that setting the horizontal width x ₁ within this range is optimum. .

Finally, a description will be given of the influence of refractive index n ₁ of the transparent plate 4a. FIG. 28 shows (a) optimization uniformity and (b) with respect to the change of the outside inclination angle θ ₂ of the lower end face of the bent surface when the refractive index n ₁ of the light transmitting plate 4 a is 1.4 to 1.8. 2.) It is a figure showing change of optimization variation coefficient. From FIG. 28, the critical angle θ _c of the light transmitting plate 4 a decreases as the refractive index n ₁ of the light transmitting plate 4 a increases. Therefore, the position where the optimization uniformity becomes minimum shifts to the side where the outside inclination angle θ ₂ decreases. Do. Also, the larger the refractive index n ₁ of the transparent plate 4a, the spread width of the low angle region optimize uniformity. In the refractive index n ₁ is 1 / sin (45 °) ( = 1.4142 °) or less, since the critical angle theta _c becomes 45 ° or less, the minimum angle at which total reflection of light inside the transparent plate 4a 45 It becomes more than °. Therefore, in this case, total reflection occurs on the outer side inclined surface E _b0 E _b2 when θ _b2 is 45 ° or less, and the reflected light is directed upward, so it is not possible to use the refractive index n ₁ of this region It is considered appropriate. These results, it is preferable that the refractive index _{n 1} of the transparent plate 4a is to be 1.5 or more, in consideration of the refractive index of the various materials in _practice, approximately n 1 = 1.5 to 1.7 of the material It is considered preferable to select

1 ceiling surface 2 room wall surface 3 floor surface 4 light transmitting plate vertical wall 4a light transmitting plate 5 socket 6 base lighting 7 vertical wall lighting

Claims (5)

An indoor illumination structure for illuminating the room of a medical room
A translucent plate vertical wall which is vertically suspended from a ceiling surface and disposed in a rectangular frame shape and is a translucent plate through which light is transmitted;
Base illumination installed on the ceiling surface along the side of a quadrangle concentric with the rectangular frame of the light transmission plate vertical wall, surrounding the entire periphery of the light transmission plate vertical wall;
Vertical wall illumination is disposed linearly along the upper end surface of the light transmitting plate vertical wall, and illuminates from the upper end surface of the light transmitting plate vertical wall toward the inside of the light transmitting plate vertical wall. Interior lighting structure characterized by The upper end portion of the light transmitting plate vertical wall is provided with a socket for covering the side surface of the upper end portion of the light transmitting plate vertical wall and fixing the light transmitting plate vertical wall to a ceiling surface,
The room lighting structure according to claim 1, wherein the socket has a mirror surface on the inner side. The light transmitting plate vertical wall is formed by arranging a plurality of flat light transmitting plates in a rectangular frame shape,
The left and right end surfaces of each of the light transmitting plates constituting the light transmitting plate vertical wall are formed as inclined surfaces, and the inclined surfaces are formed to face the outside of the frame of the light transmitting plate vertical wall. The indoor lighting structure according to claim 1 or 2, characterized in that:   The interior lighting structure according to any one of claims 1 to 3, wherein the lower end surface of the light transmitting plate vertical wall is formed as an inclined plane, a curved surface, or a bent surface. An indoor lighting method for lighting a room of a medical room, comprising:
A translucent plate vertical wall in which a translucent plate through which light passes is arranged and formed in a rectangular frame shape is vertically suspended from a ceiling surface,
Base illumination is installed on the ceiling surface along a side of a quadrangle concentric with the rectangular frame of the light transmitting plate vertical wall surrounding the entire periphery of the light transmitting plate vertical wall,
Vertical wall illumination for illuminating light from the upper end surface of the transparent plate vertical wall to the inside of the transparent plate vertical wall, between the ceiling surface and the transparent plate vertical wall, of the transparent plate vertical wall Arranged linearly along the upper end face,
The uniformity of the illuminance in the horizontal plane at a predetermined height between 0 m and 1.5 m from the floor surface of the space directly below the convex hull including the base illumination on the ceiling surface is minimized. An indoor illumination method comprising adjusting an illumination ratio of the illumination of the base illumination and the illumination of the vertical wall illumination.