JP2018006132A - Light condensing device and luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a condensing device which can be used even in a vertical orientation. A condensing device 1 includes a translucent body 2 and a translucent body 3. A surface 5 and a surface 6 are formed on the translucent body 2. The surface 6 faces the surface 5. A surface 8 and a surface 9 are formed on the translucent body 3. The surface 8 faces the surface 6. The surface 9 faces the surface 8. A convex structure 7 is formed on the surface 6 of the translucent body 2. The convex structure 7 increases in the protruding height toward the −y direction, and decreases in the width in the x-axis direction toward the −y direction. The translucent body 3 becomes thicker toward the −y direction. [Selection diagram] Fig. 1

Description

  The present invention relates to a light collecting device and an illumination device using the light collecting device.

  Patent Document 1 describes a system that uses sunlight. The system described in Patent Document 1 includes a light shelf for reflecting sunlight. The light shelf is arranged sideways so as to protrude to the outside of the building, and sunlight reflected by the upper surface of the light shelf is taken into the room.

JP 2001-3661 A

  In the system described in Patent Document 1, the light shelf must protrude outside the building. For this reason, there is a problem that the light shelf holding mechanism is complicated. In addition, since the light shelf protrudes outside the building, there is a problem that the appearance of the building is impaired.

  The present invention has been made to solve the above-described problems. An object of the present invention is to provide a light collecting device that can be used in a vertical orientation. Moreover, it is providing the illuminating device using such a condensing device.

  The condensing device according to the present invention includes a first light-transmitting body on which a flat first surface and a second surface facing the first surface are formed, and a first light-transmitting body facing the second surface of the first light-transmitting body. And a second translucent body having a fourth surface opposite to the third surface and the third surface. A convex structure is formed on the second surface. The convex structure has a protruding height that increases as it goes in the first direction along the second surface, and a width in the second direction that is orthogonal to the first direction and extends along the second surface decreases as it goes toward the first direction. . The second light transmitting body becomes thicker as it goes in the first direction.

  The condensing device according to the present invention includes a first light-transmitting body on which a flat first surface and a second surface facing the first surface are formed, and a first light-transmitting body facing the second surface of the first light-transmitting body. And a second translucent body having a fourth surface opposite to the third surface and the third surface. A concave structure is formed on the second surface. The concave structure becomes shallower as the depth goes in the first direction along the second surface, and the width in the second direction perpendicular to the first direction and along the second surface becomes larger as going toward the first direction. The second light transmitting body becomes thicker as it goes in the first direction.

  The illumination device according to the present invention includes the light collecting device, an irradiator that irradiates light received by the light receiving surface while changing its direction, a light amount adjuster that adjusts an amount of light emitted from the irradiator, Is provided. The light receiving surface faces the end surface of the second light transmitting body facing the first direction.

  The condensing device according to the present invention includes a first light transmitting body and a second light transmitting body. A convex structure is formed on the second surface of the first light transmitting body. In the convex structure, the protruding height increases as it goes in the first direction, and the width in the second direction decreases as it goes in the first direction. The second light transmitting body becomes thicker as it goes in the first direction. If it is the condensing device which concerns on this invention, it can be used also in portrait orientation.

It is a disassembled perspective view which shows the example of the condensing device in Embodiment 1 of this invention. It is sectional drawing which shows the example of the condensing device in Embodiment 1 of this invention. It is a perspective view which shows a translucent body. It is a perspective view which shows one convex structure. It is a figure for demonstrating the path | route of light. It is a figure for demonstrating the other path | route of light. It is a figure for demonstrating the other path | route of light. It is a figure which shows the dependence of the condensing rate of a transparent body. It is a figure which shows the example of the arrangement | sequence of a convex structure. It is a perspective view which shows a translucent body. It is a figure for demonstrating the path | route of the light which propagates a wedge-shaped translucent body. It is a figure for demonstrating the path | route of the light until it is condensed on a translucent body. It is a figure which shows the cross section of the groove | channel formed in the surface of a translucent body. It is a figure which shows the dependence of the condensing rate of a transparent body. It is a figure which shows the example which has arrange | positioned the condensing device toward the sun. It is a figure which shows the condensing efficiency of a condensing device. It is a figure which shows the example of the illuminating device in Embodiment 1 of this invention. It is a figure which shows the cross section of an irradiator and a light quantity regulator. It is a perspective view which shows one concave structure. It is a figure which shows the example of the illuminating device in Embodiment 3 of this invention. It is a figure which shows the example which applied the illuminating device to the building. It is a figure which shows the cross section of a diffuser. It is a figure which shows the example of the irradiator and light quantity adjuster in Embodiment 4 of this invention. It is a figure which shows the other example of the irradiator and light quantity adjuster in Embodiment 4 of this invention.

  The present invention will be described with reference to the accompanying drawings. The overlapping description will be simplified or omitted as appropriate. In each figure, the same reference numerals indicate the same or corresponding parts.

Embodiment 1 FIG.
FIG. 1 is an exploded perspective view showing an example of a light collecting device 1 according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view showing an example of the light collecting device 1 according to Embodiment 1 of the present invention. The condensing device 1 includes, for example, a translucent body 2, a translucent body 3, and a housing 4.

  The translucent body 2 has, for example, a plate shape with a constant thickness. A surface 5 and a surface 6 are formed on the translucent body 2. The surface 5 of the translucent body 2 is flat and has no irregularities. A large number of convex structures 7 (not shown in FIGS. 1 and 2) are formed on the surface 6 of the translucent body 2. The surface 6 of the light transmitting body 2 is a surface facing the surface 5 in the light transmitting body 2. A portion of the surface 6 where the convex structure 7 is not formed is flat. Hereinafter, when a particularly flat portion of the surface 6 is referred to, it is referred to as a surface 6a.

  The translucent body 3 has a plate shape, for example. The translucent body 3 is disposed so as to face the translucent body 2. A surface 8 and a surface 9 are formed on the translucent body 3. The surface 8 of the translucent body 3 is flat and has no irregularities. The surface 8 of the translucent body 3 faces the surface 6 of the translucent body 2. A large number of grooves 10 are formed on the surface 9 of the translucent body 3. The surface 9 of the light transmitting body 3 is a surface facing the surface 8 in the light transmitting body 3.

  In order to facilitate understanding, the x-axis, y-axis, and z-axis are set as shown in FIG. The x axis, the y axis, and the z axis are orthogonal to each other. A direction parallel to the x axis and gradually increasing the value of x is denoted as + x direction. A direction parallel to the x axis and gradually decreasing the value of x is expressed as a −x direction. The x-axis direction is a direction including the + x direction and the −x direction. The same applies to the y-axis and the z-axis. The + x direction and the −x direction are directions along the surface 5 and the surface 6 of the light transmitting body 2. The + y direction and the −y direction are directions along the surface 5 and the surface 6 of the transparent body 2. The + z direction and the −z direction are directions orthogonal to the surface 5 and the surface 6 of the light transmitting body 2.

  The thickness of the translucent body 3 gradually increases toward the -y direction. That is, the distance between the surface 8 and the surface 9 gradually increases toward the -y direction. The thickness of the translucent body 3 does not change in the x-axis direction. The groove 10 is formed on the surface 9 along the y-axis direction. The grooves 10 are V-grooves, for example, and are arranged at equal intervals so that there is no flat portion on the surface 9.

  The housing 4 has a box shape, for example. The inner surface 11 of the housing 4 is a surface corresponding to the bottom surface of the box. The translucent body 3 is disposed inside the housing 4 such that the surface 9 faces the inner surface 11 of the housing 4. The translucent body 2 is disposed inside the housing 4 such that the surface 5 is flush with an end surface that forms an edge of the housing 4, for example. The housing 4 has a thickness sufficient to accommodate the light transmitting body 2 and the light transmitting body 3.

  The inner surface 11 of the housing 4 is a reflecting surface that reflects light. For example, the inner surface 11 is subjected to mirror finishing for reflecting light. The inner surface 11 may be subjected to diffusion processing for reflecting light. In the example shown in the present embodiment, the portion of the housing 4 where the inner surface 11 is formed corresponds to the reflector in the claims. For example, the light collecting device 1 may include a plate-like reflector as a separate member from the housing 4. In such a case, the plate-like reflector is disposed inside the housing 4 so that the reflecting surface faces the surface 9 of the translucent body 3.

  An opening 13 is formed in a portion of the housing 4 where the end face 12 of the light transmitting body 3 faces. The end surface 12 of the translucent body 3 is a surface facing the −y direction. The end surface 12 is formed in the thickest part of the light transmitting body 3.

The arrow shown in FIG. 2 shows an example of a path along which light from the sun 14 travels. As shown in FIG. 2, the light collecting device 1 is arranged vertically so that the + y direction faces upward. For example, light from the sun 14 is incident on the surface 5 of the translucent body 2 at an incident angle θ ₁ . The light incident on the translucent body 2 propagates through the translucent body 2 and is emitted from the surface 6. The translucent body 2 has a function as a light deflecting device. The deflected light is emitted from the surface 6 of the translucent body 2.

The light emitted from the surface 6 of the translucent body 2 enters the surface 8 of the translucent body 3 at an incident angle θ ₂ . The incident angle θ ₂ is larger than the incident angle θ ₁ . The light incident on the transparent body 3 travels in the −y direction while being repeatedly reflected on the surface 8 and the surface 9. Then, the light that has propagated through the translucent body 3 and reached the end face 12 is emitted from the end face 12. The light emitted from the end face 12 passes through the opening 13 and is emitted outside the housing 4. Thus, the translucent body 3 has a function as a condenser. The light taken into the light collecting device 1 from the surface 5 goes out of the light collecting device 1 through the opening 13.

  Next, the function of the translucent body 2 will be described in detail with reference to FIGS. FIG. 3 is a perspective view showing the translucent body 2. As described above, a large number of convex structures 7 are formed on the surface 6 of the transparent body 2. For example, the convex structures 7 are regularly arranged on the surface 6. The convex structure 7 protrudes from the surface 6a. The convex structure 7 has an elongated shape in the y-axis direction. The convex structure 7 is formed on the surface 6 along the y-axis direction.

  FIG. 4 is a perspective view showing one convex structure 7. In the present embodiment, an example in which the convex structure 7 is a pentahedral prism is shown. As shown in FIG. 4, the height of the projecting structure 7 having the highest protrusion height is defined as H. The protruding height is a height protruding from the surface 6a. Further, the width in the x-axis direction of the convex structure 7 having the highest protrusion height is defined as w1. The width in the x-axis direction of the convex structure 7 at the lowest projecting height is defined as w2. The length along the y-axis of the convex structure 7 is L1.

  In the example shown in FIG. 4, the surface 15, the surface 16, the surface 17, and the surface 18 are formed on the convex structure 7. For example, the surface 15, the surface 17, and the surface 18 are perpendicular to the surface 6a in the upward direction. Surface 15 is orthogonal to the y-axis.

  As shown in FIG. 4, the protruding structure 7 has a protruding height that increases in the −y direction. For this reason, the surface 16 leaves | separates from the surface 6a as it goes to -y direction. Similarly, the surface 16 is also separated from the surface 5 toward the −y direction. The length of the boundary between the surface 16 and the surface 6a is the width w2. The surface 16 is a symmetrical trapezoid with an upper base having a width w2 and a lower base having a width w1. The surface 15 is a rectangle having a height H and a width w1 in the vertical direction.

  The convex structure 7 becomes smaller in width in the x-axis direction in the −y direction. Therefore, the width of the convex structure 7 in the x-axis direction is the largest at the portion with the lowest protrusion height. Its width is w2. The width of the convex structure 7 in the x-axis direction is the smallest at the portion with the highest protrusion height. Its width is w1. That is, the width w1 is smaller than the width w2.

  Hereinafter, the deflection function provided in the convex structure 7 will be described in detail. FIG. 5 is a diagram for explaining a light path. FIG. 5A is a yz sectional view of a portion including the convex structure 7 in the light transmitting body 2. FIG. 5B is an xy plan view of a portion including the convex structure 7 in the translucent body 2. The arrows shown in FIG. 5A and the arrows shown in FIG. 5B indicate the same light path.

In the example shown in FIG. 5, the position of y1 is set as the light origin. For example, light from the sun 14 is incident on the surface 5 of the transparent body 2 at an incident angle θ ₁ at the position y2. The light incident on the transparent body 2 from the surface 5 propagates through the transparent body 2 and reaches the surface 16 of the convex structure 7 at the position y3. The light that reaches the surface 16 of the convex structure 7 is emitted from the surface 16. When the light collecting device 1 is arranged so that the + y direction faces upward, the surface 16 is inclined so as to be separated from the surface 5 as it goes downward. For this reason, the incident angle to the surface 16 is larger than the incident angle θ ₁ to the surface 5. The light emitted from the surface 16 is bent so as to approach the surface 16. Therefore, the incident angle θ ₂ is larger than the incident angle θ ₁ .

  Next, functions of the surface 17 and the surface 18 of the convex structure 7 will be described. 6 and 7 are diagrams for explaining other paths of light. FIG. 6A and FIG. 7A are yz cross-sectional views of a portion including the convex structure 7 in the light transmitting body 2. FIG. 6B and FIG. 7B are xy plan views of a portion including the convex structure 7 in the light transmitting body 2. The arrow shown in FIG. 6A and the arrow shown in FIG. 6B indicate the same light path. The arrow shown in FIG. 7A and the arrow shown in FIG. 7B indicate the same light path.

In the example shown in FIGS. 6 and 7, the position of y5 is set as the light origin. For example, light from the sun 14 is incident on the surface 5 of the translucent body 2 at an incident angle θ ₃ at a position y6. The incident angle θ ₃ shown in FIG. 6 is larger than the incident angle θ ₁ shown in FIG. 6 and 7 show a case where the angle of incidence on the surface 5 of the transparent body 2 is larger than the total reflection angle.

  The light incident on the light transmitting body 2 from the surface 5 propagates through the light transmitting body 2 and reaches the surface 16 of the convex structure 7 at the position y7. The light that reaches the surface 16 of the convex structure 7 is totally reflected by the surface 16. The light reflected by the surface 16 further propagates through the translucent body 2 and reaches the surface 18 at the position y8. The light that reaches the surface 18 is totally reflected by the surface 18. As shown in FIG. 6A, the light reflected by the surface 18 becomes light parallel to the y-axis before entering the translucent body 2 when viewed from the x-axis direction. Further, as shown in FIG. 6B, the light totally reflected by the surface 18 becomes light bent in the + x direction or the −x direction before entering the light transmitting body 2 when viewed from the z-axis direction. . For example, in the example shown in FIG. 6B, the light reflected by the surface 18 is bent in the −x direction. If the light is reflected by the surface 17 at the position y8, it is bent in the + x direction.

  FIG. 7 shows an example in which light that has traveled along the path shown in FIG. 6 is emitted from the translucent body 2 by another convex structure 7. The light reaching y9 in FIG. 6 repeats total reflection on the surface 5 and the surface 6 at a place where the convex structure 7 is not formed. For example, the light propagating through the transparent body 2 is totally reflected by the surface 5 at the position y11. The light reflected by the surface 5 propagates through the transparent body 2 and reaches the surface 17 of the other convex structure 7 at the position y12. The light that reaches the surface 17 is totally reflected by the surface 17. The light reflected by the surface 17 further propagates through the convex structure 7 and reaches the surface 18 at the position y13. At this time, the angle at which light is incident on the surface 18 is smaller than the critical angle. The light reflected by the surface 17 is emitted from the surface 18 to the outside of the transparent body 2 at the position y13.

Thus, when the incident angle on the surface 5 is larger than the total reflection angle, the light is totally reflected by the surface 16. The light totally reflected by the surface 16 is emitted from the surface 17 or the surface 18 to the outside of the light transmitting body 2 by being totally reflected once or plural times by the surface 17 and the surface 18. Then, the angle θ ₂ in the YZ plane of the light extracted out of the translucent body 2 is totally reflected by the surface 16, and is bent to an angle closer to the Y direction. As a result, θ ₂ > θ _{1 is established} , and the angle can be easily deflected into the light transmitting body 3.

FIG. 8 is a diagram showing the dependence of the light collection rate of the light transmitting body 2. FIG. 8 shows the light condensing rate when the height H and width w2 of the convex structure 7 are changed. In the example shown in FIG. 8, the incident angle θ _{1 of} light is set to 45 °, the length L1 of the convex structure 7 is set to 10, and the width w1 of the convex structure 7 is set to 0.01.

  As shown in FIG. 8, with respect to the height H of the convex structure 7, the light condensing rate is the highest at H = 1.7 to 1.9. If the height H of the convex structure 7 is 1.7 to 1.9, the angle formed by the surface 6a and the surface 16 is 9.6 ° to 10.8 °. Similarly, the angle formed between the surface 5 and the surface 16 is 9.6 ° to 10.8 °. Regarding the width w2 of the convex structure 7, the light condensing rate is high when w2 = 1.3 to 1.7 and 2.0 to 2.2. However, the change in the light collection rate when the width w2 is changed is not as great as the change in the light collection rate when the height H is changed. In order to obtain a light condensing rate of 30% or more, the height H may be set to a value smaller than 2, and the width w2 may be set to a value of 1.3 to 2.8.

  As shown in FIG. 3, the transparent body 2 has a plate shape. Regarding the thickness of the translucent body 2, there is no functional limitation on the translucent body 2. For example, the translucent body 2 may be a sheet. In such a case, the convex structure 7 may be formed on the surface 6 in the micron order using milli-order or fine processing techniques.

  FIG. 9 is a diagram illustrating an example of the arrangement of the convex structures 7. The surface 6 of the translucent body 2 may not have a flat portion. FIG. 9 shows an arrangement in which adjacent convex structures 7 overlap each other. In the example shown in FIG. 9, the portion having the smallest distance from the surface 5 corresponds to the surface 6a of the above-described example.

  3 and 9 show examples in which the convex structures 7 are regularly arranged. The three surfaces required for realizing the above-described deflection function are the surface 16, the surface 17, and the surface 18. If the relationship between the normal vectors of the three surfaces can be maintained in the same manner as in the above-described example, the convex structures 7 may be randomly arranged on the surface 6.

  Next, the function of the transparent body 3 will be described in detail with reference to FIGS. FIG. 10 is a perspective view showing the translucent body 3. As described above, the surface 8 of the translucent body 3 is flat. A groove 10 along the y-axis direction is formed on the surface 9 of the light transmitting body 3.

  The thickness of the translucent body 3 gradually increases toward the -y direction. For example, the thickness of the thin end of the translucent body 3 is T1. The thickness of the thicker end portion of the translucent body 3 is T2. The thickness T2 is larger than the thickness T1. For this reason, the side surface 19 has a wedge shape. The side surface 19 is a surface orthogonal to the surface 8 and the end surface 12. As shown in FIG. 2, the end surface 12 is a condensing surface where light incident on the light transmitting body 2 from the surface 5 finally gathers.

FIG. 11 is a diagram for explaining a path of light propagating through the wedge-shaped light transmitting body. As shown in FIG. 11, consider an example in which light propagates through a wedge-shaped translucent body in which the angle between the surface 20a and the surface 20b is α. For example, light enters the light transmitting body from the surface 20a and travels while being totally reflected by the surface 20b and the surface 20a. If the angle from the surface 20a and the light and the surface 20a that is incident to the translucent member and theta _4, the angle between the light and the surface 20b which is reflected by the surface 20b becomes theta _4-.alpha.. When the light reflected by the surface 20b is further reflected by the surface 20a, the angle between the reflected light and the surface 20a is θ ₄ −2α. Thus, the angle of the light incident on the translucent body and the reflected surface is reduced by α every time it is totally reflected. That is, the angle of the light incident on the translucent body and the center line C decreases every time it is totally reflected.

  The same phenomenon as described above also occurs in the translucent body 3. That is, the light incident on the light transmitting body 3 from the surface 8 is collected on the end face 12 while approaching the light parallel to the y axis.

  FIG. 12 is a diagram for explaining a light path until the light is collected on the light transmitting body 3. FIG. 12A is a yz sectional view of the light transmitting body 3 and the housing 4. FIG. 12B is an xy plan view of the translucent body 3. The arrow shown in FIG. 12A and the arrow shown in FIG. 12B indicate the same light path.

  In the example shown in FIG. 12, the position of y15 is set as the light origin. For example, the light emitted from the surface 6 of the light transmitting body 2 is incident on the surface 8 of the light transmitting body 3 at the position y16. The light incident on the light transmitting body 3 from the surface 8 propagates through the light transmitting body 3 and reaches the surface 9 at the position of y17. The light that reaches the surface 9 is totally reflected by the surface 9. Further, since the groove 10 is formed on the surface 9, the light reflected by the surface 9 is bent in the + x direction or the -x direction when viewed from the z-axis direction. FIG. 12 shows an example in which light is bent in the + x direction at the position y17.

  FIG. 12 shows an example in which light passes through the transparent body 3 at the position y18. For example, the light that has propagated through the transparent body 3 is emitted from the surface 9 at the position y18. The light emitted from the surface 9 reaches the inner surface 11 of the housing 4 at the position y19. As described above, the inner surface 11 of the housing 4 is a reflecting surface. The light that reaches the inner surface 11 is regularly reflected by the inner surface 11. The light reflected by the inner surface 11 is incident on the transparent body 3 again from the surface 9 at the position y20.

  The light incident on the transparent body 3 proceeds in the −y direction while repeating total reflection on the surface 8 and the surface 9 and reaches the end surface 12. If light once passes through the translucent body 3 and enters the translucent body 3 again, the light travels in the −y direction while repeating total reflection on the surface 8 and the surface 9 and reaches the end surface 12. The light that reaches the end face 12 is emitted from the end face 12 to the outside of the light transmitting body 3. The light propagating through the translucent body 3 approaches the light parallel to the y-axis when viewed from the x-axis direction every time it is reflected by the surface 8 and the surface 9. The light propagating through the translucent body 3 is randomly bent in the x-axis direction every time it is reflected by the surface 9.

  FIG. 13 is a view showing a cross section of the groove 10 formed on the surface 9 of the light transmitting body 3. The groove 10 is a V-groove. The cross-sectional shape of the groove 10 can be defined by a triangle determined from the apex angle and the two base angles. The apex angle is an angle formed by two inclined surfaces forming the groove 10.

  FIG. 14 is a diagram showing the dependence of the light collection rate of the translucent body 3. FIG. 14 shows the light collection rate when the two base angles are changed. In the example shown in FIG. 14, the length L1 = 10, the width w1 = 0.01, and the width w2 = 2.1 are set for the convex structure 7 of the transparent body 2. Further, the light transmitting body 3 is set to have a length L2 = 100, a thickness T1 = 0.5, and a thickness T2 = 2 along the y-axis.

  As shown in FIG. 14, when one base angle is 65 ° to 75 °, a light condensing rate of 40% or more can be realized in a wide range where the other base angle is 30 ° to 75 °. The triangle that defines the cross-sectional shape of the groove 10 need not be an isosceles triangle. The triangle that defines the cross-sectional shape of the groove 10 may be an asymmetric triangle. For example, when the translucent body 3 is manufactured by resin injection molding, it is desirable that the apex angle of the groove 10 is an angle of 60 ° or more in order to stabilize the filling of the resin. For example, if one base angle is 65 ° and the other base angle is 35 ° and the apex angle is 80 °, the shape of the groove 10 can be stabilized and a high condensing rate can be realized.

  Next, the light collection efficiency when the light collecting device 1 is arranged toward the sun will be described. FIG. 15 is a diagram illustrating an example in which the light collecting device 1 is arranged facing the sun. The condensing device 1 is a device that is assumed to be placed upright along a window or wall of a building. In the example illustrated in FIG. 15, the light collecting device 1 is arranged so that the + y direction faces upward based on the above assumption. That is, the opening 13 faces downward. Moreover, in the example shown in FIG. 15, the condensing apparatus 1 is arrange | positioned so that the surface 5 of the translucent body 2 used as a light-receiving surface may face the south.

  In the following description, as shown in FIG. 15, the angular displacement in the longitude direction with reference to true south is referred to as an azimuth angle. The angular displacement in the latitudinal direction with reference to true south is expressed as an elevation angle. In the example shown in FIG. 15, the light collector 1 has a symmetrical shape with respect to the east-west direction. For this reason, the light collection efficiency for the west azimuth and the light collection efficiency for the east azimuth are the same.

  FIG. 16 is a diagram illustrating the light collection efficiency of the light collecting apparatus 1. FIG. 16 shows the light collection efficiency when the light collecting device 1 is arranged as shown in FIG. 15 and the azimuth angle and elevation angle of the incident light are changed. As shown in FIG. 16, the light collection efficiency increases when the azimuth angle is 0 ° to 20 ° and the elevation angle is 40 ° to 50 °.

  FIG. 17 is a diagram showing an example of the illumination device 21 according to Embodiment 1 of the present invention. The illumination device 21 includes, for example, the light collecting device 1, an irradiator 22, and a light amount adjuster 23. FIG. 18 is a view showing a cross section of the irradiator 22 and the light amount adjuster 23.

  The irradiator 22 irradiates light toward a specific area. The irradiator 22 receives light at the end surface 24 a of the end portion 24. That is, the end surface 24a is a light receiving surface that receives light. The light received at the end face 24a propagates through the irradiator 22. The irradiator 22 irradiates the light received by the end face 24a while changing its direction. FIG. 17 shows an example in which the end face 24 a of the irradiator 22 faces the end face 12 of the light transmitting body 3. For example, the end surface 24 a is in close contact with the end surface 12. FIG. 17 shows an example in which the irradiator 22 irradiates light collected by the light collecting device 1 toward a specific region.

  The irradiator 22 has translucency. For example, the refractive index of the irradiator 22 is the same as the refractive index of the transparent body 3. It is desirable that the irradiator 22 has the same configuration as the translucent body 2 and the translucent body 3.

  FIG. 17 shows an example in which the irradiator 22 emits light obliquely upward in order to direct light from the light collecting device 1 to the ceiling of the room or the like. For example, the irradiator 22 has a plate shape in which the end 24 is bent. The bent portion of the irradiator 22 preferably has a radius of curvature that is about five times the thickness of the irradiator 22.

  The light amount adjuster 23 adjusts the amount of light emitted from the irradiator 22. FIG. 18 shows a cross section of a part of the irradiator 22 and the light amount adjuster 23. The light amount adjuster 23 is provided in the irradiator 22. The light amount adjuster 23 includes, for example, a container 25, a reflector 26, a solar battery cell 27, a liquid 28, and a liquid amount adjuster 29.

  The container 25 has translucency. For example, the refractive index of the container 25 is the same as the refractive index of the irradiator 22. As with the irradiator 22, the container 25 is desirably transparent. The container 25 is provided in a portion of the irradiator 22 where light propagates. In the present embodiment, an example in which the entire irradiator 22 is transparent will be described. For example, the container 25 is provided on the upper surface 22a of the irradiator 22 facing obliquely upward. The lower surface 25 a of the container 25 is in close contact with the upper surface 22 a of the irradiator 22.

  The reflection plate 26 is provided in the container 25. The reflector 26 is disposed inside the container 25. The reflecting plate 26 has a reflecting surface that is mirror-finished or the like closely attached to the inner surface of the container 25. FIG. 18 shows an example in which the reflection surface of the reflection plate 26 is in close contact with the inner surface 25 b of the container 25. The inner surface 25b is an inner surface that faces obliquely upward like the upper surface 22a. The reflecting surface of the reflecting plate 26 faces the irradiator 22 through the container 25.

  The solar battery cell 27 is provided in the container 25. The solar battery cell 27 is disposed inside the container 25. Solar cell 27 receives light at light receiving surface 27a. The light receiving surface 27 a of the solar battery cell 27 faces the inner surface 25 b of the container 25. FIG. 18 shows an example in which the reflecting plate 26 is in close contact with a portion of the inner surface 25b of the container 25 where the light receiving surface 27a does not face.

  The liquid 28 is injected into the container 25. The liquid 28 is extracted from the container 25. The liquid 28 has translucency. For example, the refractive index of the liquid 28 is the same as the refractive index of the irradiator 22. The liquid 28 is desirably transparent, like the irradiator 22. The liquid 28 is optimally a commercially available optical immersion oil or optical silicone oil. If the solar battery cell 27 is waterproofed, water may be used as the liquid 28.

  The liquid amount adjuster 29 adjusts the amount of the liquid 28 in the container 25. The liquid amount adjuster 29 increases the amount of the liquid 28 in the container 25 by injecting the liquid 28 into the container 25. The liquid amount adjuster 29 reduces the amount of the liquid 28 in the container 25 by extracting the liquid 28 from the container 25. The liquid amount adjuster 29 can inject the liquid 28 into the container 25 until at least a part of the light receiving surface 27 a of the solar battery cell 27 is immersed in the liquid 28. The entire light receiving surface 27 a of the solar battery cell 27 may be immersed in the liquid 28. FIG. 18 shows an example in which the liquid 28 is injected into the container 25 so that the light receiving surface 27a of the solar battery cell 27 is immersed in half.

  In the example shown in FIGS. 17 and 18, when the light propagating through the irradiator 22 reaches the reflection plate 26, it is regularly reflected by the reflection plate 26. When light reaches a portion of the light amount adjuster 23 where the reflecting plate 26 is not disposed, the light enters the container 25 if the portion is filled with the liquid 28. Then, the light traveling through the liquid 28 is absorbed by the solar battery cell 27 when it reaches the light receiving surface 27 a of the solar battery cell 27. In this manner, the amount of light absorbed by the solar battery cell 27 can be adjusted by the amount of the liquid 28 injected into the container 25. The light that is not absorbed by the solar battery cell 27 is reflected by the liquid surface of the liquid 28 and returns to the path that travels through the irradiator 22. In FIG. 17, the light collected by the light collecting device 1 and incident on the irradiator 22 is adjusted by the light amount adjuster 23, and then from the upper surface 22 a of the irradiator 22 in which the light amount adjuster 23 is not installed. The light is emitted diagonally upward to the right. As shown in FIG. 17, the emission angle becomes smaller as the distance from the light amount adjuster 23 increases.

  Next, the correlation between the elevation angle when the sun 14 goes south and the illuminance in the room is calculated. For example, let us consider a case where light is applied to the ceiling surface of a room for 10 m in the depth direction (z-axis direction) using the condensing device 1 with the length L2 of the translucent body 3 = 1 m. It is assumed that the window width (x-axis direction) is uniformly opened.

  At a point of 35 ° north latitude, the south-middle altitude of the sun 14 varies between 32 ° and 78 °. Therefore, in the following calculation, the illuminance on the floor surface is obtained in increments of 10 ° with an elevation angle range of 30 ° to 80 °.

For example, the light collecting device 1 is arranged vertically in accordance with a window glass of a building. If the elevation angle of the sun is θ ₁ , the illuminance E ₂ received by the translucent body 2 is cos (θ ₁ ) times the illuminance received by the surface perpendicular to the sunlight. Therefore, the angle coefficient A according to the incident angle is set as follows.
A = cos (θ ₁ ) (1)

As shown in FIG. 15, in the light collecting device 1, the light propagation efficiency η changes depending on the altitude of the sun 14. Assuming that the illuminance per unit area (m ² ) received by a surface perpendicular to the light from the sun 14 is E ₁ , the amount of light E ₂ that the transparent body 2 can collect per unit area is expressed by the following equation. Is done.
E ₂ = E ₁ · η · A = E ₁ · η · cos (θ ₁ ) (2)

When evenly irradiated to the ceiling over the light in the depth 10 m, the illuminance E ₃ of the ceiling surface is expressed by the following equation.
_{E 3 = E 2/10 ···} (3)
If reflectance of 90% of the members are used on the ceiling, the illuminance E ₄ of the floor surface is expressed by the following equation.
E ₄ = 0.9E ₃ (4)

Table 1 shows the correlation between the solar altitude calculated based on the equations (1) to (4) and various illuminances.
In the example shown in Table 1, the illuminance by sunlight is set to 98000 lux.

  For example, if the indoor optimum illumination is 500 lux, the floor illumination exceeds the optimum illumination if the solar altitude is 30 ° to 70 °. When the floor surface illuminance is higher than the optimum illuminance, for example, the dimming system is operated to completely turn off other illumination such as LED illumination. Further, the liquid 28 is injected into the container 25 of the light amount adjuster 23 to cause the solar battery cell 27 to absorb light. Thereby, the floor surface illuminance is brought close to the optimum illuminance.

  If the floor illuminance is lower than the optimum illuminance, the light control system is activated to extract the liquid 28 from the container 25. For this reason, the photovoltaic cell 27 does not absorb light. The irradiator 22 irradiates all light collected by the light collecting device 1 toward the ceiling of the room. Thereby, the floor surface illuminance is brought close to the optimum illuminance.

  If it is an example shown in this Embodiment, as shown in FIG. 17, the condensing apparatus 1 can be used vertically. Even if the condensing device 1 is used in the vertical direction, sufficient condensing efficiency can be realized. The groove 10 formed on the surface 9 of the translucent body 3 and the reflecting surface formed by the inner surface 11 of the housing 4 are not essential requirements for the light collecting device 1. However, since the groove 10 is formed on the surface 9, the scattered light can be extracted from the end face 12 of the translucent body 3. Further, by providing a reflector facing the surface 9, the light collection efficiency can be greatly improved.

  In the example shown in the present embodiment, light can be applied to the ceiling or the like using the light collecting device 1 arranged vertically. The light from the lighting device 21 can be prevented from being directly irradiated to a person in the room, and the inside of the room can be sufficiently brightened only by the light from the lighting device 21.

  In the example shown in the present embodiment, the light can be condensed by, for example, 10 times or more by the light collecting device 1. For this reason, the electric power generation by the photovoltaic cell 27 can be performed efficiently. In addition, since the long wavelength light used as a heat source is absorbed by the translucent bodies 2 and 3, the solar cell 27 can absorb a wavelength with high quantum efficiency. For this reason as well, power generation efficiency can be increased. Further, since the area of the solar battery cell 27 to be used may be small, an expensive manufacturing process solar battery having a compound semiconductor or a multilayer film structure can be applied.

Embodiment 2. FIG.
In the first embodiment, the example in which the convex structure 7 is formed on the surface 6 of the light transmitting body 2 has been described. In the present embodiment, an example in which a large number of concave structures 30 are formed on the surface 6 of the translucent body 2 will be described. For example, the concave structure 30 is regularly arranged on the surface 6. The concave structure 30 has an elongated shape in the y-axis direction. The concave structure 30 is formed on the surface 6 along the y-axis direction.

  FIG. 19 is a perspective view showing one concave structure 30. FIG. 19 corresponds to FIG. In the present embodiment, an example in which the shape itself recessed from the surface 6a is a pentahedral prism is shown. In FIG. 4, the upper surface of the convex structure 7 exists on the surface 16, but in FIG. 19, the upper surface of the concave structure 30 does not exist. As shown in FIG. 19, H is the depth of the most recessed portion of the concave structure 30. That is, the depth H corresponds to the height of the highest portion of the pentahedral prism. Further, the width in the x-axis direction of the concave structure 30 at the deepest part is defined as w1. The width in the x-axis direction of the concave structure 30 at the shallowest depth is defined as w2. The length along the y-axis of the concave structure 30 is L1.

  In the example shown in FIG. 19, a surface 31, a surface 32, a surface 33, and a surface 34 are formed on the concave structure 30. For example, the surface 31, the surface 33, and the surface 34 are perpendicular to the surface 6a in the downward direction. The surface 31 is orthogonal to the y axis.

  As shown in FIG. 19, the concave structure 30 becomes shallower in the −y direction. For this reason, the surface 32 approaches the surface 6a toward the -y direction. The surface 32 moves away from the surface 5 toward the -y direction. The length of the boundary between the surface 32 and the surface 6a is the width w2. The surface 32 is a symmetrical trapezoid whose upper base is width w1 and lower base is width w2. The surface 31 is a rectangle having a height H and a width w1 in the vertical direction.

  The concave structure 30 increases in width in the x-axis direction toward the -y direction. Therefore, the width of the concave structure 30 in the x-axis direction is the largest at the shallowest part. Its width is w2. The width of the concave structure 30 in the x-axis direction is the smallest at the deepest part. Its width is w1. That is, the width w1 is smaller than the width w2.

  In the example shown in the present embodiment, the concave structure 30 is formed on the surface 6 of the transparent body 2. The concave structure 30 has the same function as the deflection function of the convex structure 7. For this reason, also in the example shown in the present embodiment, the same effect as in the example in which the convex structure 7 is formed on the surface of the light transmitting body 2 can be expected.

  The concave structures 30 may be regularly arranged on the surface 6 as in the arrangement shown in FIG. By forming the concave structure 30 on the surface 6, there may be no flat portion on the surface 6 of the light transmitting body 2. The concave structures 30 may be randomly arranged on the surface 6.

  The configuration and function of the light collecting device 1 not disclosed in the present embodiment are the same as the configuration and function disclosed in the first embodiment. For example, as shown in FIG. 8, with respect to the depth H of the concave structure 30, the light collection rate is the highest at H = 1.7 to 1.9. If the depth H of the concave structure 30 is 1.7 to 1.9, the angle formed by the surface 6a and the surface 32 is 9.6 ° to 10.8 °. Similarly, the angle formed between the surface 5 and the surface 32 is 9.6 ° to 10.8 °. Concerning the width w2 of the concave structure 30, the light condensing rate is high at w2 = 1.3 to 1.7 and 2.0 to 2.2. However, the change in the light collection rate when the width w2 is changed is not as great as the change in the light collection rate when the depth H is changed. In order to obtain a light condensing rate of 30% or more, the depth H may be set to a value smaller than 2, and the width w2 may be set to a value of 1.3 to 2.8.

  The condensing device 1 in this Embodiment can be used for the illuminating device 21 similarly to the condensing device 1 disclosed in Embodiment 1. FIG.

Embodiment 3 FIG.
FIG. 20 is a diagram illustrating an example of the illumination device 21 according to Embodiment 3 of the present invention. The illuminating device 21 in this Embodiment is provided with the some condensing device 1, the some irradiator 22, and the some light quantity adjuster 23, for example. In the example illustrated in FIG. 20, the illumination device 21 includes three sets of the light collecting device 1, the irradiator 22, and the light amount adjuster 23 that are distinguished by additional codes A to C.

  For example, the light collecting device 1A, the light collecting device 1B, and the light collecting device 1C are arranged vertically. The size of the light collecting device 1A, the light collecting device 1B, and the light collecting device 1C may be the same or different. The direction in which the irradiator 22A emits light may not coincide with the direction in which the irradiator 22B emits light and the direction in which the irradiator 22C emits light. The direction in which the irradiator 22B emits light may not coincide with the direction in which the irradiator 22C emits light. Each irradiation direction is set so that the entire range to be irradiated with light has a constant illuminance. In FIG. 20, the light collected by the light collecting device 1 </ b> A and incident on the irradiator 22 </ b> A is adjusted by the light amount adjuster 23 </ b> A, and then the upper surface 22 a of the irradiator 22 </ b> A where the light amount adjuster 23 </ b> A is not installed. The light is emitted diagonally upward to the right. As shown in FIG. 20, the emission angle becomes smaller as the distance from the light amount adjuster 23A increases. The same applies to the emission of light from the irradiators 22B and 22C. Regarding the angle between the condensing device and the irradiator, (the angle between the condensing device 1A and the irradiator 22A) <(the angle between the condensing device 1B and the irradiator 22B) <(the condensing device 1C and the irradiator 22C) Angle). Therefore, the light emission angle is (angle of light from irradiator 22A) <(angle of light from irradiator 22B) <(angle of light from irradiator 22C).

  FIG. 21 is a diagram illustrating an example in which the lighting device 21 is applied to a building 35. The light collecting device 1A, the light collecting device 1B, and the light collecting device 1C are installed along the south-facing window glass 36. For example, the light condensed by the condensing device 1A is irradiated from the irradiator 22A toward the ceiling of the room.

  The illumination device 21 in the present embodiment further includes a diffuser 37. The diffuser 37 is provided on the ceiling where the light from the irradiator 22 hits. FIG. 21 shows an example in which six diffusers 37 are installed on the ceiling. FIG. 22 is a view showing a cross section of the diffuser 37. The diffuser 37 includes a support 38, a diffusion plate 39, and a light source 40, for example.

  The diffusion plate 39 is supported by the support tool 38 so as to be suspended from the ceiling. The diffusion plate 39 has the highest thickness at the upper end and becomes thinner as it approaches the lower end. The surface 39a and the surface 39b of the diffusion plate 39 are subjected to diffusion processing for diffusing light. For example, minute irregularities are formed on the surface 39a and the surface 39b. The irregularities formed on the surface 39a and the surface 39b may be irregular ones generally referred to as wrinkles. V-grooves may be formed in the surface 39a and the surface 39b in order to create irregularities. In such a case, for example, a V groove is formed on the surface 39a in a horizontal direction, and a V groove is formed on the surface 39b in a vertical direction by changing the direction of the groove by 90 °. By changing the direction of the groove formed on the surface 39a and the direction of the groove formed on the surface 39b, light can be greatly scattered. The diffusing plate 39 is arranged so that the light emitted from the irradiator 22 strikes the surface 39a and the surface 39b. The light emitted from the irradiator 22 is diffused by the diffusion plate 39.

  The light source 40 is supported by a support tool 38. The light source 40 is disposed so as to face the upper end surface of the diffusion plate 39. The light source 40 is turned on when sufficient brightness cannot be obtained only by light emitted from the irradiator 22 such as at night. The light source 40 irradiates light on the upper end surface of the diffusion plate 39. Thereby, the light from the light source 40 can be emitted to the room through the diffusion plate 39. The light from the light source 40 is diffused when passing through the surface 39a and the surface 39b of the diffusion plate 39.

  In order to prevent light from the light source 40 from leaking from the support tool 38, the light source 40 may be completely covered by the support tool 38. In such a case, the light from the light source 40 can be efficiently taken into the diffusion plate 39 by making the inner surface of the support 38 a reflective surface.

  In the example shown in the present embodiment, the light from the irradiator 22 can be diffused by the ceiling surface and the diffusion plate 39. For this reason, gentle light with reduced glare can be supplied. The configuration and function of the light collecting apparatus 1 not disclosed in the present embodiment are the same as the configuration and function disclosed in the first or second embodiment.

Embodiment 4 FIG.
In the present embodiment, another adjustment method using the light amount adjuster 23 will be described. FIG. 23 is a diagram illustrating an example of the irradiator 22 and the light amount adjuster 23 according to Embodiment 4 of the present invention.

  The irradiator 22 includes, for example, a light guide 41 and a light guide 42. The end face 24 a described above is formed on one end 24 of the light guide 41. An end face 43 a is formed at the other end 43 of the light guide 41. The light guide 41 has translucency. For example, the refractive index of the light guide 41 is the same as the refractive index of the translucent body 3. It is desirable that the light guide body 41 is transparent like the light transmitting body 2 and the light transmitting body 3. The light guide 41 guides the light received at the end face 24a to the end face 43a. That is, the light incident from the end face 24a propagates through the light guide 41 and reaches the end face 43a.

  The light guide 42 is translucent like the light guide 41. For example, the refractive index of the light guide 42 is the same as the refractive index of the translucent body 3. It is desirable that the light guide 42 is transparent like the light transmitting body 2 and the light transmitting body 3. An end face 44 a is formed at one end 44 of the light guide 42. The light guide 42 is disposed so that the end surface 44 a faces the end surface 43 a of the light guide 41. A gap having a certain width is formed between the end face 43 a of the light guide 41 and the end face 44 a of the light guide 42.

  The light amount adjuster 23 includes, for example, a container 25, a reflection plate 26, a solar battery cell 27, a liquid 28, and a driving device 45. The container 25 is provided in the irradiator 22. The end portion 43 of the light guide 41 penetrates the side wall of the container 25. An end surface 43 a of the end portion 43 is disposed inside the container 25. The end 44 of the light guide 42 penetrates the other side wall of the container 25. An end surface 44 a of the end portion 44 is disposed inside the container 25. That is, the container 25 is disposed so as to cover the end 43 of the light guide 41 and the end 44 of the light guide 42. The end surface 44 a of the light guide 42 faces the end surface 43 a of the light guide 41 inside the container 25.

  The reflection plate 26 is provided in a portion of the light guide 41 that is disposed inside the container 25. The reflection plate 26 covers a portion other than the end face 43a among the above portions. The reflector 26 is in close contact with the light guide 41, for example. Further, the reflection plate 26 is provided in a portion of the light guide 42 that is disposed inside the container 25. The reflection plate 26 covers a portion other than the end face 44a among the above portions. The reflector 26 is in close contact with the light guide 42, for example.

  A liquid 28 is placed in the container 25. The gap formed between the end surface 43a and the end surface 44a is completely filled with the liquid 28. The refractive index of the liquid 28 is the same as the refractive index of the light guide 41 and the refractive index of the light guide 42, for example. If only the liquid 28 exists between the end face 43a and the end face 44a, the light that has propagated through the light guide 41 and reached the end face 43a propagates through the liquid 28 and enters the light guide 42 from the end face 44a. .

  The solar battery cell 27 is provided so as to be movable inside the container 25. The solar battery cell 27 can be displaced to a position where at least a part is arranged in a gap formed between the end face 43a and the end face 44a and a position not arranged in the gap between the end face 43a and the end face 44a. The driving device 45 drives the solar battery cell 27. For example, the solar battery cell 27 is disposed such that the light receiving surface 27a is parallel to the end surface 43a and the end surface 44a. The drive device 45 moves the solar battery cell 27 along the end surface 43a. Thereby, the drive device 45 puts the solar battery cell 27 into and out of the gap between the end surface 43a and the end surface 44a.

  When the solar battery cell 27 is disposed in the gap between the end surface 43a and the end surface 44a, the light receiving surface 27a faces the end surface 43a. In such a case, part of the light traveling from the end surface 43 a of the light guide 41 to the liquid 28 reaches the light receiving surface 27 a and is absorbed by the solar battery cell 27. By driving the solar battery cell 27 with the driving device 45, the area of the portion of the light receiving surface 27a of the solar battery cell 27 that faces the end face 43a can be changed. That is, the amount of light absorbed by the solar battery cell 27 can be adjusted by changing the area where the light receiving surface 27a faces the end surface 43a. The light that is not absorbed by the solar cells 27 propagates through the liquid 28 and enters the light guide 42 from the end face 44a.

  FIG. 24 is a diagram showing another example of the irradiator 22 and the light amount adjuster 23 according to Embodiment 4 of the present invention. The irradiator 22 is the same as the example disclosed in the first embodiment.

  The light amount adjuster 23 includes, for example, a reflecting plate 26, a solar battery cell 27, a liquid 28, and a driving device 45. The reflector 26 is provided in the irradiator 22. As for the reflecting plate 26, the reflecting surface on which the mirror surface processing or the like is performed is in close contact with the upper surface 22a of the irradiator 22. The reflector 26 is, for example, a sheet shape. The thickness of the reflecting plate 26 is extremely thin as compared with the thickness of the solar battery cell 27. FIG. 24 shows an example in which an opening is formed in the central portion of the reflection plate 26.

  The liquid 28 has translucency. For example, the refractive index of the liquid 28 is the same as the refractive index of the irradiator 22. The liquid 28 is desirably transparent, like the irradiator 22. The liquid 28 is provided in layers so as to cover the reflection plate 26. The liquid 28 is also filled in the opening formed in the reflecting plate 26.

  The solar battery cell 27 is placed on the liquid 28. If the liquid 28 has a viscosity of 100 to 1000 cSt, the solar battery cell 27 can be held by the irradiator 22 through the liquid 28. That is, a liquid layer is formed by the liquid 28 between the solar battery cell 27 and the reflector 26 and between the solar battery cell 27 and the irradiator 22. The solar battery cell 27 is disposed downward so that the light receiving surface 27 a is immersed in the liquid 28. The solar battery cell 27 can be displaced to a position where at least a part of the light receiving surface 27a faces the upper surface 22a of the irradiator 22 and a position where the light receiving surface 27a does not face the upper surface 22a.

  The driving device 45 drives the solar battery cell 27. For example, the solar battery cell 27 is disposed such that the light receiving surface 27 a is parallel to the upper surface 22 a of the irradiator 22 and the reflecting plate 26. Since the solar battery cell 27 is held in the liquid layer, if a force is applied in a direction parallel to the light receiving surface 27a, the solar battery cell 27 slides sideways. The driving device 45 moves the solar battery cell 27 along the upper surface 22a and the reflector 26. Thereby, the drive device 45 hides the solar battery cell 27 on the back side of the reflection plate 26 or puts it out from the back side.

  In the state shown in FIG. 24, a part of the light receiving surface 27 a faces the upper surface 22 a of the irradiator 22. In such a case, part of the light traveling from the irradiator 22 to the liquid 28 reaches the light receiving surface 27 a and is absorbed by the solar battery cell 27. By driving the solar battery cell 27 with the driving device 45, the area of the portion of the light receiving surface 27 a of the solar battery cell 27 that faces the upper surface 22 a of the irradiator 22 can be changed. That is, the amount of light absorbed by the solar battery cell 27 can be adjusted by changing the area where the light receiving surface 27a faces the upper surface 22a. The light that is not absorbed by the solar battery cell 27 is reflected by the liquid surface of the liquid 28 and returns to the path that travels through the irradiator 22.

  The configuration and function of the light collecting apparatus 1 not disclosed in the present embodiment are the same as the configuration and function disclosed in any of the first to third embodiments. The condensing device 1 in this Embodiment can be used for the illuminating device 21 similarly to the condensing device 1 disclosed by other embodiment.

  DESCRIPTION OF SYMBOLS 1 Condenser, 2 Translucent body (1st translucent body), 3 Translucent body (2nd translucent body), 4 Housing | casing, 5 Surface, 6 Surface, 7 Convex structure, 8 Surface, 9 Surface , 10 grooves, 11 inner surface, 12 end surface, 13 opening, 14 sun, 15 surface, 16 surface, 17 surface, 18 surface, 19 side surface, 20a surface, 20b surface, 21 illumination device, 22 illuminator, 22a upper surface, 23 light quantity Adjuster, 24 end, 24a end surface, 25 container, 25a lower surface, 25b inner surface, 26 reflector, 27 solar cell, 27a light receiving surface, 28 liquid, 29 liquid volume adjuster, 30 concave structure, 31 surface, 32 Surface, 33 surface, 34 surface, 35 building, 36 window glass, 37 diffuser, 38 support, 39 diffuser plate, 40 light source, 4 DESCRIPTION OF SYMBOLS 1 Light guide (1st light guide), 42 Light guide (2nd light guide), 43 End part, 43a End surface, 44 End part, 44a End surface, 45 Drive apparatus

Claims (12)

A first light-transmitting body formed with a flat first surface and a second surface facing the first surface;
A second light transmitting body in which a third surface facing the second surface of the first light transmitting body and a fourth surface facing the third surface on the side opposite to the second surface side are formed. When,
With
A convex structure is formed on the second surface;
The protruding structure has a protruding height that increases in the first direction along the second surface, and a width in the second direction that is orthogonal to the first direction and along the second surface is in the first direction. It gets smaller as you go,
The second light transmitting body is a light condensing device in which the thickness is increased toward the first direction. A fifth surface is formed on the convex structure so as to move away from the first surface toward the first direction.
The condensing device according to claim 1, wherein an angle formed between the fifth surface and the first surface is 9.6 ° to 10.8 °. A first light-transmitting body formed with a flat first surface and a second surface facing the first surface;
A second light transmitting body in which a third surface facing the second surface of the first light transmitting body and a fourth surface facing the third surface on the side opposite to the second surface side are formed. When,
With
A concave structure is formed on the second surface;
The concave structure becomes shallower as the depth goes in the first direction along the second surface, and the width in the second direction along the second surface is perpendicular to the first direction and goes in the first direction. Grows according to
The second light transmitting body is a light condensing device in which the thickness is increased toward the first direction. A fifth surface is formed on the concave structure away from the first surface toward the first direction;
The condensing device according to claim 3, wherein an angle formed by the fifth surface and the first surface is 9.6 ° to 10.8 °.   The condensing device according to any one of claims 1 to 4, wherein a groove along the first direction is formed on the fourth surface. The groove is a V-groove whose cross section is defined by a triangle determined by an apex angle and two base angles,
One of the base angles is 65 ° to 75 °;
The condensing device according to claim 5, wherein the other of the base angles is 30 ° to 75 °.   The condensing device according to any one of claims 1 to 6, further comprising a reflector facing the fourth surface of the second light transmitting body. The light collecting device according to any one of claims 1 to 7,
An irradiator that irradiates the light received on the light receiving surface by changing its direction;
A light amount adjuster for adjusting the amount of light emitted from the irradiator;
With
The light receiving surface is an illuminating device facing an end surface of the second light transmitting body facing the first direction. The light amount adjuster is
A container provided in the irradiator;
Solar cells disposed inside the container;
A liquid amount adjuster for adjusting the amount of liquid in the container;
With
The lighting device according to claim 8, wherein the liquid amount adjuster is capable of injecting the liquid into the container until at least a part of the solar battery cell is immersed in the liquid. The irradiator is
A first light guide for guiding light received by the light receiving surface to a first end surface;
A second light guide opposite to the first end face of the first light guide with a second end face spaced apart;
With
The light amount adjuster is
A container in which the first end surface of the first light guide and the second end surface of the second light guide are disposed;
A liquid that fills the gap;
Solar cells that can be arranged in the gap,
A driving device that moves the solar battery cell along the first end face, and changes an area of a part of the solar battery cell facing the first end face of the first light guide;
The lighting device according to claim 8, comprising: The light amount adjuster is
A sheet-like reflector provided in the irradiator;
A solar battery cell in which a liquid layer is formed between the reflecting plate, and
A driving device that moves the solar cell along the reflector and changes an area of the solar cell facing the irradiator;
The lighting device according to claim 8, comprising: A diffusion plate for diffusing the light emitted from the irradiator;
A light source for irradiating the diffusion plate with light;
The lighting device according to claim 8, further comprising:

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