JP2014038765A - Light condensing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve simplification of the production and great increase of the light condensing capacity of a light condensing device which utilizes a total reflection action in an inside region of a light transmission material.SOLUTION: A light condensing device 1, which comprises a light transmission material showing a refractive index larger than air, includes: an incidence surface 1a; a forced reflection surface 1b opposing to this; an emission surface 1c of reflection light which internally propagates while reflecting between the incidence surface and the forced reflection surface. The forced reflection surface 1b is made to be a mirror surface specification, and the internal propagation light reflected at the mirror specification part reflects totally at the incidence surface 1a. A natural light daylighting structure which comprises a light condensing device having a double side mirror structure in which a rear side outer part of the forced reflection surface 1b is also made to be a mirror surface specification is also disclosed.

Description

  The present invention relates to a condensing device that utilizes the total reflection action in the internal region of various light transmitting materials such as acrylic, polycarbonate, glass, diamond, and sapphire.

  Incident light from an external medium such as air enters the light transmitting material, and an inner part of the boundary surface of the front-opening external medium facing the incident surface (hereinafter referred to as “opposing reflection surface” as necessary). The light is transmitted to the exit surface in a state of being confined in the inner region of the light transmitting material by the reflection action between the light transmitting material and the light transmitting material.

  In particular, when the opposing reflection surface is set to a so-called forced reflection surface in the specular specification, the incident light to the inner area of the light transmitting material can cause total reflection on the incident surface after specular reflection on the forced reflection surface. The minimum incident angle is shifted to a smaller one (= a direction in which a propagation limit angle β described later becomes larger).

  In other words, natural light with a small incident angle to the inner area of the light-transmitting material can be collected by, for example, propagating to the lower exit surface while repeating specular reflection and total reflection between the forced reflection surface and the incident surface. It is related with the condensing device which raised significantly.

  In this specification, the incident angle to the incident surface is obtained by calculation of [“90.0 °” − (the counterclockwise angle from the incident surface to the incident light: corresponding to the angle display of the propagation limit angle β)]. The value of is used.

  For example, the incident angles of incident light corresponding to each β shown in FIGS. 2 to 5 are sequentially reduced to “+ 34.3 °”, “+ 18.4 °”, “0.0 °”, and “−12.1 °”. . Thus, the magnitude relation of the incident angle is determined on the positive and negative numerical sequences, and “−12.1 °” is smaller than “0.0 °”.

  The condensing device of the present invention includes at least the other opposing side surface and the emitting surface in addition to the incident surface and the opposing reflecting surface constituting one opposing side surface.

  In the present specification, as described above, the opposing reflection surface and the specular reflection surface of the specular specification are both used as an inner surface portion opposed to the incident surface, that is, a surface portion in which the outside thereof is discarded.

  Further, the other opposing side surface (1e in the figure), which is a side surface different from the opposing reflection surface and the forced reflection surface, is used to include both inner and outer surfaces.

  In this specification, one side of each of the incident surface and the opposite reflection surface of the light collecting device is referred to as “left” and “right”, and each side of the other opposite side is referred to as “front” and “rear”. And the side of the exit surface is denoted as “below” (see FIG. 1).

  Further, as necessary, the horizontal direction is referred to as “horizontal”, the vertical direction is referred to as “vertical”, and the vertical cross section perpendicular to the boundary line between the incident surface and the output surface is referred to as “vertical cross section”.

  The overall shape of the condensing device is, for example, a downwardly spreading aspect in which the left and right entrance surfaces and the forced reflection surface are more outwardly spread toward the exit surface, and the front and back opposing side surfaces are, for example, from a line-symmetric trapezoid or a line-symmetric triangle In other words, it has a substantially weir shape (bank shape).

  Note that east, west, south, and north indicate directions when the light collecting device is disposed in a daylighting unit or the like in the northern hemisphere. In the southern hemisphere, of course, the “north-south” relationship is reversed.

  Conventionally, incident light having a large incident angle is caused to reach the bottom while repeating total reflection in one polygonal pyramid prism, and incident light having a small incident angle is adjusted in direction by passing through a plurality of polygonal pyramid prisms. A condensing device has been proposed that allows the light to reach the bottom while repeating total reflection in one polygonal pyramid prism (see Patent Document 1).

JP 2001-84817 A

  In the present invention, without using a plurality of polygonal pyramid prisms as in the conventional example, the incident light from the air or the like to the inner region of the light transmission material is specularly specular with its incident surface and a front opening facing it. The condensing device is configured to propagate to the exit surface by the action of specular reflection and total reflection that occur in sequence with the forced reflection surface.

  As a result, the low elevation angle natural light incident on the inner region of the light transmitting material is propagated to the exit surface while repeating specular reflection and total reflection between the forced reflection surface and the incident surface, thereby producing the condensing device. The purpose is to simplify the process and to greatly increase the light collecting ability.

  Another object of the present invention is to make the outer part of the back side of the forced reflection surface into a specular specification, thereby making it possible to daylight not only the internally propagated light but also the externally reflected light.

  Another object of the present invention is to make the inner surface of the opposite side surface connecting the entrance surface and the forced reflection surface specularly, thereby preventing light leakage from other than the exit surface.

  In addition, when the reflected light from the forced reflection surface reaches the boundary between the incident surface and the exit surface, the area below the final reflection position on the forced reflection surface is displaced toward the entrance surface to reduce the area of the exit surface. Thus, an object is to increase the light collection density (area ratio between the incident surface and the exit surface).

  In addition, a medium having a refractive index greater than that of air is arranged at the part following the exit surface, and the total reflection critical angle at the exit surface is increased, so that the incident reflected light propagated to the exit surface is effectively applied to the medium. It aims at utilization.

  Another object of the present invention is to make the incident surface and the forced reflection surface opposite to each other so that the spread angle of the incident light to the condensing device is narrowed at the exit surface, that is, the emitted light is aligned.

The present invention solves the above problems as follows.
(1) It is made of a light transmitting material having a refractive index larger than that of the external medium, and has an incident surface (for example, an incident surface 1a described later) and a forced reflection surface (for example, a later described forced reflection surface 1b) opposed to the front surface in the form of a front opening. ) And an exit surface (for example, exit surfaces 1c and 1c ′ described later) of reflected light that propagates internally while reflecting between the incident surface and the forced reflection surface (for example, collect light described later). In the device 1, 1 ′, 1 ″)
The forced reflection surface is
Set to specular spec,
Internally propagated light reflected by the specular spec part is totally reflected by the incident surface,
The thing of a structure aspect is used.
(2) In (1) above,
The forced reflection surface is
The back side outside part (for example, back side outside part 1g described later) is set to a mirror surface specification.
The thing of a structure aspect is used.
(3) In the above (1) and (2),
A pair of opposing side surfaces (for example, a side surface 1e to be described later) that are continuous with each of the entrance surface, the forced reflection surface, and the exit surface;
The opposing side surface is
Its inner part is set to specular specification,
The thing of a structure aspect is used.
(4) In the above (1) to (3), the forced reflection surface of the specular specification is
When the reflected light reaches the emission surface and is totally reflected, a portion below the reflection position on the forced reflection surface (for example, a lower portion 1f described later) is a forced reflection surface portion above the reflection position. Displace inside the extended surface of
Set to reduce the area of the exit surface,
The thing of a structure aspect is used.
(5) In (4) above,
The reflection position is
The reflected light is a reflection position when reaching the boundary portion between the incident surface and the exit surface at a critical angle with respect to the incident surface.
The thing of a structure aspect is used.
(6) In the above (1) to (5),
The exit surface (eg, exit surface 1c ′ described later) is
In contact with a medium region (for example, a water region 1h described later) having a higher refractive index than air,
It is set to increase the critical angle at the exit surface,
The thing of a structure aspect is used.

  The condensing device having the above configuration is an object of the present invention.

The present invention is based on the above problem solving means.
(11) Simplify the manufacturing of the condensing device and greatly increase the condensing capacity.
(12) Daylighting of not only the internally propagating light of the light collecting device but also the externally reflected light,
(13) To prevent light leakage from other than the exit surface.
(14) Increasing the light collection density (area ratio between the entrance surface and the exit surface)
(15) To make effective use of incident reflected light to a medium having a refractive index larger than that of air disposed in a portion following the exit surface.
(16) The spread angle of the incident light to the condensing device is narrowed on the exit surface, and alignment of the exit light is attempted.
You can do that.

It is explanatory drawing which shows the whole shape of a condensing device. It is explanatory drawing which shows propagation limit angle (beta) (10.0) in case the opening angle (alpha) of an incident surface and a forced reflective surface is 10.0 degrees. It is explanatory drawing which shows propagation limit angle (beta) (15.0) in case the opening angle (alpha) of an incident surface and a forced reflective surface is 15.0 degrees. FIG. 6 is an explanatory diagram showing a propagation limit angle β (21.1) when the opening angle α between the incident surface and the forced reflection surface is 21.1 ° corresponding to half the critical angle. It is explanatory drawing which shows propagation limit angle (beta) (25.0) in case the opening angle (alpha) of an incident surface and a forced reflective surface is 25.0 degrees. FIG. 6 is an explanatory diagram showing enlargement of the propagation limit angle β at each opening angle α in FIG. 2 to FIG. 5 (change due to mirroring of the opposing reflection surface) accompanying the forced reflection surface addition. FIG. 5 is an explanatory diagram comparing two types of vertical concentrator cross-sections of narrow and wide exit surfaces with different opening widths at the same opening angle “21.1 °” as in FIG. 4. At the same opening angle “21.1 °” as in FIG. 4, the opening angle at the lower end side with respect to the incident surface is set to ½ of the opening angle for the predetermined portion on the lower end side of the forced reflection surface (the predetermined portion is orthogonal to the exit surface). ) It is explanatory drawing which shows the condensing device longitudinal section. FIG. 5 is an explanatory view showing a concentrating device longitudinal section in which an opening angle “21.1 °” as in FIG. 4 is provided, and a water region having a longitudinal section rectangular shape having a refractive index larger than that of air of an external medium is provided immediately below the exit surface. It is explanatory drawing which shows the concentrating device for solar tracking of the form which attached the two condensing devices of the same shape to the holding | maintenance metal fitting so that the whole may become substantially plane symmetry. It is explanatory drawing which shows the lighting structure which provided the condensing device in each east, west, and each end part of the lighting part, such as a light duct. It is explanatory drawing which shows the taking-in state of the low elevation angle sunlight of the lighting structure of FIG. It is explanatory drawing which shows the taking-in state of the high elevation angle sunlight of the lighting structure of FIG.

  The form for implementing this invention is demonstrated using FIGS.

  The components of the reference numbers with alphabets (for example, the incident surface 1a) used in FIGS. 1 to 13 are in principle part of the components of the numerical portions of the reference numbers (for example, the light collecting device 1). .

1 to 13,
1, 1 ′ is a concentrating device having a so-called weir shape, in which the lower part is wide and the longitudinal section is a symmetrical trapezoid centering on the longitudinal line (see FIGS. 11 to 13 for 1 ′),
1 ″ has a broad bottom and a vertical cross-sectional shape that is a symmetrical trapezoid with a vertical line as the center, and a so-called weir-shaped condensing device with a base water area (see FIG. 9).
1a is a rectangular incident surface,
1b is a square forced reflection surface (inner portion) composed of a mirror surface facing the incident surface 1a,
1c is a square-shaped exit surface (lower surface)
1c ′ is a so-called virtual exit surface of the light collecting device 1 ″ (see FIG. 9),
1d is a rectangular upper surface facing the emission surfaces 1c and 1 ′,
1e is a pair of side surfaces of a trapezoidal shape or a triangular shape set in an opposing state, or a side cross section (longitudinal cross section) composed of a plane parallel thereto
If the reflected light from the forced reflection surface 1b reaches the intersecting straight line portion between the incident surface 1a and the exit surface 1c, the portion below the final reflection position on the forced reflection surface 1b,
1g is a back side outer portion formed in a specular specification on the back side of the forced reflection surface 1b of the light collecting device 1 ′ (see FIGS. 11 to 13),
1h is a water region (medium region having a refractive index larger than that of air) having a rectangular cross section set in a portion immediately below the light exiting surface 1c ′ of the light collecting device 1 ″.
Respectively.

Also,
α is an opening angle between the incident surface 1a and the forced reflection surface 1b of each condensing device,
β is an incident surface corresponding to the minimum incident angle of the incident light range in which the light that is specularly reflected by the forced reflection surface 1b is reflected by the incident surface and propagates through the condensing device among the incident light on the incident surface 1a. Propagation limit angle indicating the incident light angle from the upper side (= remainder angle with respect to the minimum incident angle),
Vp is an arbitrary virtual incident point on the incident surface 1a,
R1 is an internal propagation path of incident light incident on the virtual incident point Vp at the propagation limit angle β,
R2 is an internal propagation path of incident light that is perpendicularly incident on the virtual incident point Vp,
R3 is an internal propagation path of incident light incident on the virtual incident point Vp at the propagation limit angle in the previous figure (see FIGS. 3 to 5),
A is an internally propagating incident light range in which the reflected light from the forced reflecting surface 1b is totally reflected by the opposite incident surface 1a among the incident light to the virtual incident point Vp,
Respectively.

11 to 13,
2 is a holding bracket for evenly mounting two light collecting devices 1 of the same size,
2a is a tracking rotation axis of the holding metal fitting 2 when performing the tracking operation of the condensing device to the sun,
3 is a roof of the building, a well-known light duct and skylights arranged on the rooftop,
3a is an east condensing device (= condensing device 1 ') disposed at the east end of the daylighting unit 3.
3b is a western light collecting device (= light collecting device 1 ') disposed at the west end of the daylighting unit 3.
3c is a northern light collecting device (= light collecting device 1) arranged at the north end of the daylighting unit 3.
Shows each

  Here, an acrylic resin having a characteristic value of “critical angle 42.2 °, refractive index 1.49” is used as the light collecting devices 1, 1 ′, 1 ″ made of a light transmitting member.

  Of course, various light transmitting materials such as polycarbonate, glass, diamond, and sapphire other than acrylic can be used as appropriate.

  The height of the condensing devices 1 and 1 ′ is “100 mm”. The length of the hypotenuse part of the side surface (side section) 1e can be calculated from this height and the opening angle α, and is “101.7 mm” when “α = 21.1 °” (see FIG. 7).

  Each of the internal propagation paths R1 includes an internal path along the incident surface 1a. Further, if each inner surface portion other than the incident surface 1a and the forced reflection surface 1b of the condensing devices 1, 1 ′, 1 ″ is made to have a specular surface specification, it is possible to reduce leakage of internal incident light to the condensing device to the outside. .

  The basic feature of the light collecting device of the present invention is that the next reflecting surface (opposing reflecting surface) of the refracted light incident from the incident surface 1a is a mirror surface.

  For example, in the case of the light collecting device 1 in which the opening angle α between the incident surface and the forced reflection surface in FIG. 2 is “10.0 °” by setting the opposite reflection surface of the incident surface 1a to the forced reflection surface 1b having a specular surface specification. The propagation limit angle β is expanded from “37.4 °” to “55.7 °”.

  That is, light incident on an arbitrary virtual incident point Vp on the incident surface 1a having an incident angle of “34.3 °” or more is totally reflected on the incident surface 1a after being reflected on the forced reflection surface 1b. The numerical value of “34.3 °” is obtained by subtracting “55.7 °” of the propagation limit angle β from “90.0 °”.

  By providing the specular specular reflection surface 1b in this way, the minimum incident angle of the incident light propagating through the condensing device is reduced from “52.6 ° (90.0-37.4)” to “34.3 °”. Yes.

  As the minimum incident angle of the incident light decreases, the concentrating device 1 placed vertically (the emission surface is on the lower side) can take in natural light having a lower elevation angle and propagate it to the emission surface.

  As shown in FIGS. 3 to 5, the propagation limit angle β decreases as the opening angle α between the incident surface 1 a and the forced reflection surface 1 b increases. In response to this, natural light with a lower elevation angle is taken into the vertical light collecting device.

  That is, the incident angle range of light that can be emitted from the exit surface 1c by internal propagation with total internal reflection on the inside of the entrance surface among the incident natural light that reaches the virtual entrance point Vp as the opening angle α is set large. Become wider.

  FIG. 6 shows an opening angle α between the incident surface 1a and the forced reflection surface 1b of each condensing device 1 in FIGS. 2 to 5 and an increase in the propagation limit angle β accompanying the setting of the forced reflection surface (mirror surface specification). It is the list which summarized the relationship of.

That is, by using the forced reflection surface (opposite reflection surface) 1b having a mirror surface specification, the propagation limit angle β at each opening angle α in FIGS. 2 to 5 is compared with the case where the opposite reflection surface is not a mirror surface specification.
(21) When “α = 10.0 °” in Fig. 2, it expands from 37.4 ° to 55.7 °,
(22) When “α = 15.0 °” in FIG. 3, it is expanded from 47.1 ° to 71.6 °,
(23) When “α = 21.1 °” in FIG. 4, it expands from 57.6 ° to 90.0 °,
(24) When “α = 25.0 °” in FIG. 5, the angle increases from 63.9 ° to 102.1 °.

  As described above, with this enlargement, the minimum incident angle of the incident light propagating through the condensing device while repeating that the reflected light of the forced reflecting surface 1b is totally reflected by the incident surface 1a becomes smaller.

  2 to 5, the minimum incident angles are “+ 34.3 ° (= 90.0−55.7)”, “+ 18.4 °”, “0.0 °”, “−12.1 ° (= 90.0−102.1 ”is smaller, and“ −12.1 ° ”is smaller than“ 0.0 ° ”.

  FIG. 7 shows a comparison between the narrow (a) width and the wide (b) light collecting device 1 of FIG. 4 having an opening angle α of “21.1 °”.

  7 (a) and 7 (b) both have the same propagation limit angle β, but their output light densities (= incident surface area / output surface area) are different.

  In each of the concentrators in FIGS. 7 (a) and 7 (b), the emitted light density is approximately, the concentrator in (a) is “2.6 (= 101.7 / 39.7)”, and the concentrator in (b) is “1.6”. (= 101.7 / 62.2) ”.

  To increase the output light density of the concentrator, narrow the width in the left-right direction as shown in Fig. 7 (a), or light sapphire (1.77) or diamond (2.42) whose refractive index is higher than acrylic (1.49). A condensing device consisting of

  FIG. 8 shows that the “opening angle” between the lower reflection portion 1 f of the forced reflection surface 1 b of the light collecting device of FIG. 4 and the incident surface is ½ of the original opening angle α “21.1 °”. It is the condensing apparatus 1 set as follows.

  As shown in FIG. 8B, the start portion of the lower portion 1f is reflected by the forced reflection surface 1b of incident light incident at the propagation limit angle β (90.0 °) of the light collecting device 1 in FIG. This is the reflection position on the forced reflection surface when it reaches the boundary between the incident surface 1a and the exit surface 1c.

  In other words, this reflection position is the reflection position when the first reflected light from the forced reflection surface 1b reaches the boundary between the incident surface and the exit surface 1c at a virtual critical angle with respect to the incident surface 1a. I can say that.

  Since the trapezoidal side cross-section of FIG. 4 has a line-symmetric shape centered on the vertical direction line, the lower portion 1f of FIG. 8 has a shape orthogonal to the exit surface 1c.

  By forming the lower portion 1f, the emission light density on the emission surface is increased in a state where a decrease in the amount of light emitted from the emission surface 1c is suppressed.

  As shown in FIG. 8A, although the light beam reflected by the lower portion 1f at the original opening angle α of the forced reflection surface 1b reaches the output surface 1c, the incident angle at this time is larger than the critical angle. It is focused on the fact that it is so large that it cannot be emitted from the emission surface 1c, that is, the lower portion cannot participate in internal propagation of incident light to the emission surface.

  In other words, the lower portion 1f where the reflected light is not involved in the internal propagation to the exit surface 1c is bent inward so as to reduce the area of the exit surface itself, thereby increasing the exit light density.

  In FIG. 9 (a), the exit surface critical angle is increased by setting the water region 1h, and the exit surface critical angle for the totally reflected light in FIG. 9 (b) cannot be emitted as it is from FIG. 1 shows a condensing device 1 ″ having a larger diameter. The opening angle α of the light collecting devices 1 and 1 ″ shown in the figure is “21.1 °” which is the same as that in FIG.

  The incident angle of the incident light with respect to the exit surface 1c of the forced reflection surface 1b incident at the propagation limit angle β (90.0 °) in FIG. 9B is “58.4 °”. It exceeds “42.2 °”. Therefore, the reflected light undergoes total reflection at the exit surface 1c and cannot be emitted.

  Here, by providing a water region 1h in the lower part in contact with the exit surface 1c ′, the critical angle of the exit surface is expanded from “42.2 °” at the acrylic / air interface to “63.2 °” at the acrylic / water interface. Yes.

  Due to the enlargement of the emission surface critical angle, total reflection at the emission surface 1c ′ is suppressed, and a part of the internally reflected light from the forced reflection surface 1b is emitted to the water region 1h. The final reflected light having an incident angle “58.4 °” with respect to the emission surface 1c in FIG. 9B can also be emitted from the emission surface 1c to the water region 1h. The propagating light emitted to the water region 1h heats the stored “water”.

  FIG. 10 shows a daylighting structure having a sunlight tracking function in which the same size of light collecting devices 1 and 1 are equally arranged on the holding metal fitting 2 so that the same rotational moment is applied to the tracking rotation shaft 2a.

  FIG. 11 shows a daylighting structure in which condensing devices 1 and 1 ′ are arranged at the east, west and north ends of daylighting parts such as light ducts and skylights arranged on the roof of the building and the rooftop.

  Here, the east light collecting device 3a (light collecting device 1 ') and the west light collecting device 3b (light collecting device 1') arranged at the end portions on the east side and the west side are respectively forced reflection surfaces 1b and their The back side outer portion 1g is in a double-sided mirror form in which the specular specification is formed. The northern light collecting device 3c at the north end uses the light collecting device 1 without setting the back outer portion 1g as it is.

  FIG. 12 shows a state in which sunlight (morning sun, sunset) from a low elevation angle is taken into the daylighting unit 3 by the east light collecting device 3a or the west light collecting device 3b.

  The sunlight at this time passes through the incident surface 1a of the east light collector 3a or the west light collector 3b and then propagates to the daylighting unit 3 while being reflected between the forced reflection surface 1b and the light incident surface.

  FIG. 13 shows a state in which sunlight from a relatively high elevation angle is taken into the daylighting unit 3 by the east collector 3a or the west collector 3b.

The sunlight at this time is
(31) After passing through the entrance surface 1a of the east collector 3a and the west collector 3b, it is reflected between the forced reflection surface 1b and the entrance surface,
(32) And the light is reflected by the back side outer portion 1g of the specular spec of the east collector 3a and the west collector 3b.
Propagate to the daylighting unit 3 in the form.

  Of course, in FIG. 12 and FIG. 13, sunlight is also taken into the daylighting unit 3 from the northern light collecting device 3 c (light collecting device 1).

  The sunlight that is taken into the daylighting unit 3 from the east light collecting device 3a, the west light collecting device 3b, and the north light collecting device 3c has its traveling direction changed downward. Therefore, when the tip of the daylighting unit is an optical duct, the number of reflections of the sunlight in the duct is reduced, and the propagation loss can be suppressed.

The specular specifications of the forced reflection surface 1b, the upper surface 1d, the side surface 1e, and the back outer portion 1g are as follows:
(41) Arrange mirror surface members such as aluminum, glass, resin film,
(42) Vacuum deposition of aluminum, silver, etc.
It is formed by such a method.

  Moreover, the condensing device 1 ″ provided with the water region 1h in FIG. 9 is created by bonding, for example, a dam-shaped upper light propagation structure and a rectangular parallelepiped lower water accommodation structure.

Of course, the present invention is not limited to the above embodiments, for example,
(51) The value of the opening angle α shown in the embodiment is merely an example, as long as the path of the internally propagating light that the reflected light from the forced reflection surface 1b totally reflects on the incident surface is secured as α. Use any value of
(52) For the opening angle α of the light collecting devices 1 and 1 ′ used in FIGS. 10 to 13, an arbitrary value similar to the above (51) is used.
(53) A condensing device whose side surface 1e is triangular is used.
(54) A condensing device having asymmetrical side surfaces 1e,
(55) The entire lower side portion 1f or the lower end side portion of the forced reflection surface 1b is deformed toward the incident surface 1a in a manner different from that in FIG.
(56) The starting portion of the lower portion 1f of the forced reflection surface 1b is set to a position shifted upward or downward from the reflection position of the reflected light on the forced reflection surface 1b shown by the dotted line in FIG.
(57) Silicone oil, Dowsum A (registered trademark) or the like is used as a medium to replace the water region 1h.
You may do it.

1: Condensing device 1 ′: Condensing device (FIGS. 11 to 13)
1 ″: Light collecting device (FIG. 9)
1a: entrance surface 1b: forced reflection surface 1c: exit surface (lower surface)
1c ′: exit surface (FIG. 9)
1d: Upper surface 1e: Side surface, side cross section 1f: Lower portion from the final reflection position of the forced reflection surface (FIG. 8)
1g: Back side outer part (FIGS. 11 to 13)
1h: Water area (Fig. 9)

α: Opening angle between the incident surface 1a and the forced reflection surface 1b β: Propagation limit angle (= coil with respect to the minimum incident angle)
Vp: arbitrary virtual incident point R1 of the incident surface 1a: internal propagation path R2 of incident light incident on the virtual incident point Vp at the propagation limit angle β: internal propagation path R3 of incident light incident perpendicularly to the virtual incident point Vp: Internal propagation path A of incident light incident on the virtual incident point Vp at the propagation limit angle shown in the previous figure: Internal propagation incident light range in which the reflected light from the forced reflection surface 1b is totally reflected by the incident surface 1a

(FIGS. 10 to 13)
2: Holding metal fitting 2a: Tracking rotation shaft 3: Daylighting unit 3a: Touhou light collecting device (= light collecting device 1 ')
3b: West collector (= collector 1 ′)
3c: Northern condensing device (= condensing device 1)

Claims (6)

It consists of a light-transmitting material having a refractive index larger than that of the external medium, and propagates internally while reflecting between the incident surface, a forcible reflecting surface facing forward in the form of a front opening, and the incident surface and the forced reflecting surface. In a light collecting device including an exit surface of reflected light,
The forced reflection surface is
Set to specular spec,
Internally propagated light reflected by the specular spec part is totally reflected by the incident surface,
A light condensing device. The forced reflection surface is
The back side outside part is set to mirror surface specification,
The condensing device according to claim 1. A pair of opposing side surfaces that are continuous with each of the incident surface, the forced reflection surface, and the exit surface;
The opposing side surface is
Its inner part is set to specular specification,
The condensing device according to claim 1, wherein The forced reflection surface of the specular specification is
When the reflected light reaches the exit surface and is totally reflected, the portion below the reflection position on the forced reflection surface is displaced inward from the extended surface of the forced reflection surface portion above the reflection position. And
Set to reduce the area of the exit surface,
The condensing device according to any one of claims 1 to 3. The reflection position is
The reflected light is a reflection position when reaching the boundary portion between the incident surface and the exit surface at a critical angle with respect to the incident surface.
The condensing device according to claim 4. The exit surface is
In contact with a medium region having a higher refractive index than air,
It is set to increase the critical angle at the exit surface,
The light collecting device according to claim 1, wherein the light collecting device is a light collecting device.

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