JP2010067565A - Daylighting prism sheet, and daylighting device - Google Patents

Daylighting prism sheet, and daylighting device Download PDF

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JP2010067565A
JP2010067565A JP2008235081A JP2008235081A JP2010067565A JP 2010067565 A JP2010067565 A JP 2010067565A JP 2008235081 A JP2008235081 A JP 2008235081A JP 2008235081 A JP2008235081 A JP 2008235081A JP 2010067565 A JP2010067565 A JP 2010067565A
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prism
angle
daylighting
degrees
prism sheet
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Kazumi Mizuhara
和美 水原
Masanori Kobayashi
正典 小林
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Ryoko Co Ltd
Mitsubishi Rayon Co Ltd
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Ryoko Co Ltd
Mitsubishi Rayon Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
    • F24S23/10—Prisms
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers

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  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a daylighting prism sheet suppressing a rainbow pattern even under a low solar altitude condition, and achieves sufficient daylighting. <P>SOLUTION: The daylighting prism sheet is used in the daylighting device in which solar light is incident from a prism surface side, and is emitted by changing its optical path. The daylighting prism sheet has a prism row of a plurality of prism-shaped parts having two inclined surfaces with respect to a plane of a transparent substrate on one surface side of a transparent base. An angle of one side apex A formed of the one inclined surface of the prism shaped part and a perpendicular to the plane of the transparent base is 8-60°. An angle of one side apex B formed of the other inclined surface of the prism shaped part and the perpendicular is 8-60°. An angle of an apex C formed of the two inclined surfaces is 16-89°. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、採光用プリズムシート、及び建造物等の遮蔽物により太陽光が遮られ日陰となる部分に対して、虹模様なく照射できる採光装置に関する。   The present invention relates to a daylighting apparatus that can irradiate a shaded part of sunlight by a daylighting prism sheet and a shade such as a building without a rainbow pattern.

従来、太陽光の採光装置は、季節や時間による太陽の方位や高度の変化に合わせて太陽光を追尾するシステムを備えるものが多く提案されている。   Conventionally, many solar lighting devices have been proposed that include a system for tracking sunlight in accordance with changes in the direction and altitude of the sun depending on the season and time.

また、特許文献１には、フレネルレンズを利用した屋上用全天光集光系が提案されている。この集光系は、光の角度を大きく変えるために、フレネルレンズを対称に２枚以上組み合わせた構造を有している。   Patent Document 1 proposes a rooftop all-light focusing system using a Fresnel lens. This condensing system has a structure in which two or more Fresnel lenses are combined symmetrically in order to greatly change the angle of light.

特許文献２には、建物の中庭などに採光することを目的として、建物の屋根の上に、角度・設置方向を調節可能としたプリズムシートで構成されたプリズムパネルを設けた採光装置が提案されている。   Patent Document 2 proposes a daylighting device in which a prism panel made of a prism sheet made of a prism sheet whose angle and installation direction can be adjusted is provided on the roof of a building for the purpose of daylighting in a courtyard of the building. ing.

特許文献３には、プリズムを利用した採光装置では屈折を利用し光を大きく曲げると虹模様（色分かれ）が発生する問題が記載され、この問題を解消するために反射鏡とプリズムシートが組み合わされた採光装置が提案されている。
特開平３−５６７１号公報 特開２００５−２６００４号公報 特開平６−２７３６８９号公報 Patent Document 3 describes a problem that a rainbow pattern (color separation) occurs in a daylighting apparatus using a prism when the light is bent largely using refraction, and a reflector and a prism sheet are combined to solve this problem. An improved daylighting device has been proposed.
JP-A-3-5671 Japanese Patent Laying-Open No. 2005-2604 JP-A-6-27389

太陽光を追尾するための制御装置を搭載した採光装置は、構造が複雑でコストが高くなったり、故障が発生しやすかったりする等の問題があった。   A daylighting device equipped with a control device for tracking sunlight has problems such as a complicated structure and high cost, and a failure is likely to occur.

フレネルレンズを利用した屋上用全天光集光系は、フレネルレンズが２枚以上必要であるため、コスト的に不利である上、フレネルレンズが対称となるように位置合わせをする必要があり、取り扱いが煩雑になる。   Since the rooftop all-sky light condensing system using the Fresnel lens requires two or more Fresnel lenses, it is disadvantageous in terms of cost and needs to be aligned so that the Fresnel lens is symmetric. Handling becomes complicated.

プリズムを利用した採光装置は、太陽高度の低い条件では、プリズムシートの角度・設置方向の調整だけでは、太陽光を遮蔽する建造物近傍を照射することは困難である。また、プリズムの屈折のみを利用して太陽光の角度を大きく曲げようとすると虹模様（色分かれ）が発生する。   It is difficult for a daylighting device using a prism to irradiate the vicinity of a building that shields sunlight only by adjusting the angle and installation direction of the prism sheet under conditions of low solar altitude. In addition, when only the refraction of the prism is used to greatly bend the sunlight angle, a rainbow pattern (color separation) occurs.

反射鏡とプリズムシートが組み合わされた採光装置は、プリズムシートの他に反射鏡が必要であり、さらに太陽光にあわせた回転駆動装置が必要であるため構造が複雑である。   The daylighting device in which the reflecting mirror and the prism sheet are combined requires a reflecting mirror in addition to the prism sheet, and further requires a rotation driving device that matches the sunlight, so that the structure is complicated.

本発明の目的は、プリズムを利用した簡単な構造で、太陽高度の低い条件でも虹模様が抑えられ十分な採光が可能な採光装置、及びこの採光装置に用いられるプリズムシートを提供することにある。   An object of the present invention is to provide a daylighting device that has a simple structure using a prism, can suppress a rainbow pattern even under a low solar altitude, and can perform sufficient daylighting, and a prism sheet used in the daylighting device. .

本発明は、太陽光をプリズム面側から入射させ、その光路を変更して出射する採光装置に使用される採光用プリズムシートであって、
透明基体の片面側に、該透明基体の平面に対して二つの傾斜面をもつプリズム形状部が複数配列されたプリズム列を有し、
前記プリズム形状部の一方の傾斜面と前記透明基体の平面に対する垂線とがなす片側頂角Ａの角度が８度以上６０度以下の範囲にあり、
当該プリズム形状部の他方の傾斜面と前記垂線とがなす片側頂角Ｂの角度が８度以上６０度以下の範囲にあり、
前記二つの傾斜面がなす頂角Ｃの角度が１６度以上８９度以下である採光用プリズムシートである。 The present invention is a daylighting prism sheet used in a daylighting apparatus that allows sunlight to enter from the prism surface side, changes the optical path, and emits it.
On one side of the transparent substrate, there is a prism row in which a plurality of prism-shaped portions having two inclined surfaces with respect to the plane of the transparent substrate are arranged,
The angle of one side apex angle A formed by one inclined surface of the prism-shaped portion and a perpendicular to the plane of the transparent substrate is in the range of 8 degrees to 60 degrees,
The angle of the one-side apex angle B formed by the other inclined surface of the prism-shaped portion and the perpendicular is in the range of 8 degrees to 60 degrees,
The lighting prism sheet has an apex angle C formed by the two inclined surfaces of 16 degrees or more and 89 degrees or less.

前記頂角Ｃの角度が１６度以上７０度以下である前記採光用プリズムシートであることが好ましい。   It is preferable that the prism sheet for daylighting has an apex angle C of 16 degrees or more and 70 degrees or less.

前記プリズム列において、頂角Ｃの角度が互いに異なるプリズム形状部が混在している前記採光用プリズムシートであることが好ましい。   In the prism row, the daylighting prism sheet in which prism-shaped portions having different apex angles C are mixed is preferable.

第１の角度の頂角Ｃ−１を持つプリズム形状部からなる第１のプリズム列と、第１の角度と異なる第２の角度の頂角Ｃ−２を持つプリズム形状部からなる第２のプリズム列を有する前記採光用プリズムシートであることが好ましい。   A first prism array having a prism shape portion having a first angle apex angle C-1 and a second prism shape portion having a second angle apex angle C-2 different from the first angle. The daylighting prism sheet having a prism row is preferable.

前記プリズム列が形成された面とは反対側の面に、該反対側の面からの出射光を拡散する拡散材または拡散形状が形成されている前記採光用プリズムシートであることが好ましい。   It is preferable that the light collecting prism sheet has a diffusing material or a diffusing shape for diffusing light emitted from the opposite surface on a surface opposite to the surface on which the prism rows are formed.

前記プリズム形状部の一方の傾斜面から入射し、他方の傾斜面で全反射し、前記プリズム列が形成された面とは反対側の面から出射する光が拡散されるように、該プリズム形状部の少なくとも一方の傾斜面が曲面となっている前記採光用プリズムシートであることが好ましい。   The prism shape is formed so that light incident from one inclined surface of the prism shape portion, totally reflected by the other inclined surface, and diffused from the surface opposite to the surface on which the prism row is formed is diffused. The daylighting prism sheet is preferable in which at least one inclined surface of the portion is a curved surface.

また本発明は、太陽光を入射させ、その光路を変更して出射する採光装置であって、前記採光用プリズムシートを具備する採光装置である。   Further, the present invention is a daylighting apparatus that emits sunlight by changing its optical path and is provided with the daylighting prism sheet.

前記採光用プリズムシートの平面が、水平面に対して傾斜して配置される前記採光装置であることが好ましい。   It is preferable that the daylighting device is arranged such that a plane of the daylighting prism sheet is inclined with respect to a horizontal plane.

本発明によれば、構造を簡単にできるため、故障の発生が少なく、低コストで採光ができる。また、太陽高度の低い条件でも虹模様の目立たない十分な採光が可能となる。   According to the present invention, since the structure can be simplified, the occurrence of failure is small and daylighting can be performed at low cost. In addition, it is possible to perform sufficient daylighting so that the rainbow pattern does not stand out even under low solar altitude conditions.

本発明による採光用プリズムシートは、太陽光をプリズム面側から入射させ、その光路を変更して出射する採光装置に使用される採光用プリズムシートであって、透明基体の片面側に、該透明基体の平面に対して二つの傾斜面をもつプリズム形状部が複数配列されたプリズム列を有し、前記プリズム形状部の一方の傾斜面と前記透明基体の平面に対する垂線とがなす片側頂角Ａの角度が８度以上６０度以下の範囲にあり、当該プリズム形状部の他方の傾斜面と前記垂線とがなす片側頂角Ｂの角度が８度以上６０度以下の範囲にあり、前記二つの傾斜面がなす頂角Ｃの角度が１６度以上８９度以下の範囲にある。   The daylighting prism sheet according to the present invention is a daylighting prism sheet used in a daylighting apparatus that allows sunlight to enter from the prism surface side and emits light by changing the optical path thereof. A prism apex having a plurality of prism-shaped portions each having two inclined surfaces with respect to the plane of the substrate, and a one-side apex angle A formed by one inclined surface of the prism-shaped portions and a perpendicular to the plane of the transparent substrate. The angle of one side apex angle B formed by the other inclined surface of the prism-shaped portion and the perpendicular is in the range of 8 degrees or more and 60 degrees or less. The apex angle C formed by the inclined surface is in the range of 16 degrees to 89 degrees.

なお、前記プリズム形状部の各傾斜面と前記透明基体の平面に対する垂線とがなす角はともに鋭角である。また前記プリズム形状部の各傾斜面と前記透明基体の平面とがなす二つの相対する角はともに９０度以下である。   The angles formed by the inclined surfaces of the prism-shaped portion and the perpendicular to the plane of the transparent substrate are both acute angles. Further, two opposing angles formed by each inclined surface of the prism-shaped portion and the plane of the transparent substrate are 90 degrees or less.

また本発明による採光装置は、太陽光を入射させ、その光路を変更して出射する採光装置であって、前記採光用プリズムシートを具備する採光装置である。   A daylighting apparatus according to the present invention is a daylighting apparatus that emits sunlight by changing its optical path and is provided with the daylighting prism sheet.

採光用プリズムシートが、そのプリズム列が形成された面を上方に向けて設けられ、前記プリズム形状部の一方の傾斜面から入射した太陽光が、他方の傾斜面で全反射し、前記採光用プリズムシートの前記プリズム列が形成された面とは反対側の面から出射するように、且つこの出射光が、太陽光を遮蔽する遮蔽物により日陰となる部分へ照射されるように、該遮蔽物の頂上部に設置して使用される、採光装置であることが好ましい。   The daylighting prism sheet is provided with the surface on which the prism row is formed facing upward, and the sunlight incident from one inclined surface of the prism-shaped portion is totally reflected by the other inclined surface, The shielding of the prism sheet so that the light is emitted from the surface opposite to the surface on which the prism rows are formed, and the emitted light is irradiated to the shaded portion by the shielding material that shields sunlight. It is preferable that it is a lighting device that is used by being installed on the top of an object.

また前記採光用プリズムシートの平面が、水平面に対して傾斜して配置される、前記採光装置であることが好ましい。   Moreover, it is preferable that it is the said lighting apparatus with which the plane of the said prism sheet for lighting is arrange | positioned inclining with respect to a horizontal surface.

本発明による採光装置の一実施形態の概略構造を図１に示す。太陽３から発する光が建造物２に遮られて日陰５が形成される。採光装置１をその建造物２の屋上に設置することで、太陽からの光線４の進路が大きく曲げられ、建造物２による日陰５に光の照射範囲６を形成することができる。   A schematic structure of an embodiment of a daylighting apparatus according to the present invention is shown in FIG. The light emitted from the sun 3 is blocked by the building 2 to form a shade 5. By installing the daylighting device 1 on the roof of the building 2, the path of the light beam 4 from the sun is greatly bent, and the light irradiation range 6 can be formed in the shade 5 by the building 2.

太陽３の高度が比較的低い条件において、日陰５における建造物２の近傍部分に光を照射するためには、太陽光線４の進路を大きく変化させる必要がある。   In order to irradiate light in the vicinity of the building 2 in the shade 5 under conditions where the altitude of the sun 3 is relatively low, it is necessary to greatly change the course of the sunbeam 4.

本発明では、例えば図２に示すように光の屈折と全反射が利用可能になるプリズムの頂角Ｃを１６度以上８９度以下に規定し、プリズムシートの設置角度７−６を調節することで、１枚のプリズムシートで光の進路を大きく変化させることができ、且つ虹模様を目立ちにくくすることができる。   In the present invention, for example, as shown in FIG. 2, the apex angle C of the prism at which light refraction and total reflection can be used is regulated to 16 degrees or more and 89 degrees or less, and the installation angle 7-6 of the prism sheet is adjusted. Thus, the path of light can be greatly changed with one prism sheet, and the rainbow pattern can be made inconspicuous.

また、太陽光を追尾する構造を有しなくても十分な採光が可能であるため、複雑な構造を必要とせず、安価で故障しにくい採光装置が得られる。太陽光を追尾する構造を有しないと、光の照射位置は太陽方位によって東西方向の移動が発生するが、建造物による日陰部分も同様に移動するため、日陰部分の照射は可能である。   In addition, since sufficient daylighting is possible without having a structure for tracking sunlight, a daylighting apparatus that does not require a complicated structure and is inexpensive and less likely to fail can be obtained. If there is no structure for tracking sunlight, the light irradiation position moves in the east-west direction depending on the solar direction, but the shaded part due to the building also moves in the same manner, so that the shaded part can be illuminated.

比較的太陽高度の低い条件において日陰の建造物の近い部分を照射するためには、光線の曲がり角を大きくする必要がある。例えば図２に示すようにプリズム列が設けられた透明基体の面（以下「プリズム面」）を上に向けプリズム面側から太陽光を入射させ全反射を利用することにより、効率よく光を曲げることができる。その際、全反射を利用して地面の日陰を十分に照射する観点から、プリズムの片側頂角Ａ、Ｂの角度はそれぞれ８度以上６０度以下で且つ頂角Ｃの角度（頂角Ａと頂角Ｂの合計角度）が１６度以上８９度以下である。片側頂角Ａ、Ｂの角度がそれぞれ４５度以下であることが好ましい。また頂角Ｃの角度が７０度以下であることが好ましい。例えば、片側頂角Ａ、Ｂの角度はそれぞれ４０度以下に設定でき、さらに３５度以下に設定できる。また頂角Ｃの角度は６０度以下に設定でき、さらに５５度以下に設定できる。一方、頂角Ｃの角度が小さすぎると、プリズムの加工に使用する金型の製作及びプリズムの成形が難しくなったり、プリズム使用中に破損しやすくなったりするため、及び十分な採光を可能にするため、頂角Ｃの角度は３０度以上が好ましく、４０度以上がより好ましい。また、片側頂角Ａ、Ｂの角度は、小さくなるほどプリズムの金型からの離型が困難になるため、及び十分な採光を可能にするため、１０度以上が好ましい。   In order to irradiate a close part of a shaded building under a relatively low solar altitude, it is necessary to increase the angle of the light beam. For example, as shown in FIG. 2, the surface of the transparent substrate provided with the prism row (hereinafter referred to as “prism surface”) is directed upward so that sunlight is incident from the prism surface side and total reflection is used to bend light efficiently. be able to. At that time, from the viewpoint of sufficiently irradiating the shade of the ground using total reflection, the angles of the one-side apex angles A and B of the prism are 8 degrees to 60 degrees and the apex angle C (the apex angle A and The total angle of the apex angle B) is not less than 16 degrees and not more than 89 degrees. It is preferable that the angle of one side apex angle A and B is 45 degrees or less, respectively. The apex angle C is preferably 70 degrees or less. For example, the angles of the one-side apex angles A and B can be set to 40 degrees or less, and further can be set to 35 degrees or less. Moreover, the angle of the apex angle C can be set to 60 degrees or less, and further can be set to 55 degrees or less. On the other hand, if the apex angle C is too small, it becomes difficult to manufacture the mold used for processing the prism and to form the prism, or it is easy to break during use of the prism, and sufficient lighting is possible. Therefore, the angle of the apex angle C is preferably 30 degrees or more, and more preferably 40 degrees or more. Further, the angle of the apex angles A and B on one side is preferably 10 degrees or more because it becomes difficult to release the prism from the mold as it becomes smaller, and in order to enable sufficient lighting.

ここで、プリズムの片側頂角Ａ、Ｂとは、プリズムシート基体平面（図２では符号７−５に相当）に対する垂線とプリズム傾斜面（図２では符号７−１と７−２に相当）とのなす鋭角である。図２において、プリズムの片側頂角Ａ、Ｂは、符号７−３、符号７−４で示される。プリズムの頂角Ｃとは、いわゆるプリズムの頂角を意味し、二つのプリズム傾斜面がなす角である。図２においては、プリズム傾斜面７−１とプリズム傾斜面７−２がなす角であり、頂角Ａと頂角Ｂから構成される。   Here, the one-side apex angles A and B of the prism are perpendicular to the prism sheet substrate plane (corresponding to reference numeral 7-5 in FIG. 2) and the prism inclined surface (corresponding to reference numerals 7-1 and 7-2 in FIG. 2). Is an acute angle. In FIG. 2, the apex angles A and B on one side of the prism are denoted by reference numerals 7-3 and 7-4. The prism apex angle C means the so-called prism apex angle, which is an angle formed by two prism inclined surfaces. In FIG. 2, the angle formed by the prism inclined surface 7-1 and the prism inclined surface 7-2 is composed of an apex angle A and an apex angle B.

プリズム列のピッチ（頂角Ｃの頂点間ピッチ）については、ピッチが大きすぎると、プリズムの高さが大きくなり、透明材の重量も増す不都合が生じる。逆にピッチが小さくなりすぎると光の波長のサイズに近づくため、光の波長依存性が無視できなくなる。これらの観点から、プリズム列のピッチの下限側は、１μｍ以上が好ましく、１０μｍ以上がより好ましく、５０μｍ以上がさらに好ましく、上限側は、１００ｍｍ以下が好ましく、１０ｍｍ以下がより好ましく、５ｍｍ以下がさらに好ましい。   As for the pitch of the prism rows (the pitch between the apexes of the apex angle C), if the pitch is too large, the prism height increases and the weight of the transparent material increases. On the other hand, if the pitch is too small, it approaches the size of the wavelength of light, so the wavelength dependency of light cannot be ignored. From these viewpoints, the lower limit side of the pitch of the prism row is preferably 1 μm or more, more preferably 10 μm or more, further preferably 50 μm or more, and the upper limit side is preferably 100 mm or less, more preferably 10 mm or less, and further preferably 5 mm or less. preferable.

プリズム列の形状は、プリズム形状部の稜線（二つのプリズム傾斜面の交線）に垂直な断面において、図３に示すような連続した列状でも、または図４−１、図４−２、図４−３に示すような間欠タイプでもよいが、間欠タイプの場合、プリズム傾斜面同士の間隔が大きいと効率が落ちるため、適度な間隔に設定することが好ましい。このような観点から、プリズム列の形成領域におけるプリズム傾斜面が占める領域以外の領域（プリズム形状部内のプリズム傾斜面間およびプリズム形状部間の平坦部）の面積（透明基体平面上への投影面積）は、２０％以下であることが好ましく、１０％以下であることがより好ましく、５％以下であることがさらに好ましい。プリズム列の形成領域におけるプリズム傾斜面が占める領域の面積（プリズム傾斜面の透明基体平面上への投影面積）は、８０％以上であることが好ましく、９０％以上であることがより好ましく、９５％以上であることがさらに好ましい。   The shape of the prism row may be a continuous row shape as shown in FIG. 3 in a cross section perpendicular to the ridge line of the prism shape portion (intersection line of two prism inclined surfaces), or FIG. 4-1, FIG. Although the intermittent type as shown in FIG. 4-3 may be used, in the case of the intermittent type, if the interval between the prism inclined surfaces is large, the efficiency is lowered. From this point of view, the area (projected area on the transparent substrate plane) of the region other than the region occupied by the prism inclined surface in the prism row formation region (between the prism inclined surface in the prism shape portion and the flat portion between the prism shape portions) ) Is preferably 20% or less, more preferably 10% or less, and even more preferably 5% or less. The area occupied by the prism inclined surface in the prism row formation region (projection area of the prism inclined surface onto the transparent substrate plane) is preferably 80% or more, more preferably 90% or more, and 95. % Or more is more preferable.

プリズムシートの形成は、透明な板、シートまたはフィルム等の透明基体の表面に熱プレス、押出成形、射出成形などによりプリズム形状を形成することができる。透明な材料としては、ポリメチルメタクリレート（ＰＭＭＡ）、ポリカーボネート（ＰＣ）、ポリエチレンテレフタレート（ＰＥＴ）、ポリスチレン（ＰＳ）などを用いることができる。これら透明材料の屈折率としては、１．４〜１．７の範囲が好ましい。屈折率の測定は、例えばＪＩＳ Ｋ７１０５に準じた方法で行うことができる。   The prism sheet can be formed on the surface of a transparent substrate such as a transparent plate, sheet or film by hot pressing, extrusion molding, injection molding or the like. As the transparent material, polymethyl methacrylate (PMMA), polycarbonate (PC), polyethylene terephthalate (PET), polystyrene (PS), or the like can be used. The refractive index of these transparent materials is preferably in the range of 1.4 to 1.7. The refractive index can be measured by a method according to, for example, JIS K7105.

フィルムなど厚みの薄いものにプリズム形状を形成し、透明な板に貼ったり、２枚の透明な板で挟んだりしてもよい。   A prism shape may be formed on a thin material such as a film and pasted on a transparent plate, or may be sandwiched between two transparent plates.

プリズム列の形状は、例えば図５−１に示すように、頂角の異なる２種類以上のプリズムを混在して形成すると、広範囲な太陽高度に対して採光することが可能となる。頂角の異なるプリズムは同じ頂角のプリズムをまとめてグループ毎に配置してもよいし、交互に繰り返し配置してもよい。例えば第１の角度の頂角Ｃ−１を持つプリズム形状部からなる第１のプリズム列と、第１の角度と異なる第２の角度の頂角Ｃ−２を持つプリズム形状部からなる第２のプリズム列を有するプリズムシートを用いることが好ましい。頂角の差が大きい２種類のプリズムを１列ずつ交互に配置する場合には、図５−２に示すように高さが交互に異なる形状とすると、隣のプリズムの影となる部分が生じることがあるが、この影となる部分の発生が問題となるときは、図５−３に示すようにピッチを調整して各プリズムを同じ高さにした形状とするとよい。   For example, as shown in FIG. 5A, when the prism array is formed by mixing two or more types of prisms having different apex angles, it is possible to take light over a wide range of solar altitudes. The prisms having different apex angles may be arranged in groups of prisms having the same apex angle or may be alternately and repeatedly arranged. For example, a first prism array having a prism shape portion having a first angle apex angle C-1 and a second prism shape portion having a second angle apex angle C-2 different from the first angle. It is preferable to use a prism sheet having the prism rows. When two types of prisms having a large difference in apex are alternately arranged one by one, if the shapes are alternately different as shown in FIG. 5B, a shadowed portion of the adjacent prism is generated. In some cases, however, when the occurrence of a shadow portion becomes a problem, it is preferable to adjust the pitch so that the prisms have the same height as shown in FIG.

本発明によれば、プリズムを利用して直射の太陽光をほぼ平行光のまま採光し、明るく日陰部分を照射することができるが、採光する場所によっては明暗のコントラストを低減させた光が望まれることがある。そのような場合には、プリズムシートのプリズム列が形成された面とは反対側の面にマット加工やシボ加工等により拡散材や拡散形状を付与したり（例えば図６−１）、各プリズム部の少なくとも片側の傾斜面をわずかに曲面としたりする（例えば図６−２）ことで出射光を拡散させることができる。このように出射光を適度に拡散させることで、明暗のコントラストを目立たなくさせ、平行光の場合より広い面積を照射することができる。傾斜面を曲面にする場合は、図６−２に示すように、入射光を全反射させる側の傾斜面を曲面にすることが好ましく、その曲面はプリズム外側へ向けて凸となる曲面であることが好ましい。なお、前記傾斜面が曲面の場合、プリズム形状部の稜線と、該傾斜面と透明基体平面との交線とを結んでできる平面を基にして片側頂角を算出することとする。   According to the present invention, it is possible to radiate direct sunlight using a prism as almost parallel light and irradiate a brightly shaded portion. However, depending on the place where the light is collected, light with reduced contrast between light and dark is desired. May be. In such a case, the surface of the prism sheet opposite to the surface on which the prism row is formed is provided with a diffusing material or a diffusing shape by mat processing or embossing (for example, FIG. 6-1), or each prism The emitted light can be diffused by making the inclined surface of at least one side of the portion slightly curved (for example, FIG. 6-2). Thus, by appropriately diffusing the emitted light, the contrast between light and dark becomes inconspicuous, and a wider area can be irradiated than in the case of parallel light. When the inclined surface is a curved surface, as shown in FIG. 6B, the inclined surface on the side that totally reflects incident light is preferably a curved surface, and the curved surface is a curved surface that is convex toward the outside of the prism. It is preferable. When the inclined surface is a curved surface, the one-side apex angle is calculated based on a plane formed by connecting the ridge line of the prism-shaped portion and the intersecting line between the inclined surface and the transparent substrate plane.

太陽光は波長分布が広く、プリズムを利用し大きく屈折させようとすると、透明材の屈折率に波長依存性があるため、波長によって出射光の角度が変わる影響が無視できなくなる。屋外用途では照射面が出射面から離れているケースが考えられるため、照射面が離れるほど波長による照射位置のずれが大きくなることから、虹模様が目立ちやすくなる。   Sunlight has a wide wavelength distribution, and if it is intended to be refracted greatly using a prism, the refractive index of the transparent material has wavelength dependency, so the effect of changing the angle of outgoing light depending on the wavelength cannot be ignored. Since the case where the irradiation surface is separated from the emission surface can be considered for outdoor use, the rainbow pattern becomes more conspicuous because the irradiation position shift due to the wavelength increases as the irradiation surface moves away.

（出射角及び照射位置の算出例）
片側頂角（７−３、７−４）の角度：２５度の対称プリズム形状を表面に形成したプリズムシートを、設置傾斜角（後述）の角度：１６度、太陽高度：１８度の条件で、プリズム面を上に向けた場合、下に向けた場合についてスネルの法則を用いて出射角の計算を行った（図２及び図７参照）。空気の屈折率を波長によらず１とし、ＰＭＭＡの屈折率を波長４００ｎｍの時１．５１、波長７００ｎｍの時１．４９として、それぞれの波長について、空気からＰＭＭＡ、ＰＭＭＡから空気へ光の屈折と全反射の角度を求めた。プリズム面を上に向けてプリズムシートを設置した場合には、反入射側プリズム傾斜面への入射角（７−７）は屈折率１．５１のとき５５．９５度、屈折率１．４９のとき５６．０３度となり、それぞれの臨界角（屈折率１．５１のとき４１．４７度、屈折率１．４９のとき４２．１６度）を超えるので全反射が生じる。同じ設置傾斜角でプリズム面を下に向けた場合には、全反射は起こらない。下記スネルの法則（式１）に基づく計算によって、屈折率４００ｎｍ並びに７００ｎｍでの出射角θ（１０）を求め、１０ｍ離れた面の照射位置Ｄ（１２）を算出した。結果を表１にまとめた。 (Example of calculation of emission angle and irradiation position)
The angle of one side apex angle (7-3, 7-4): A prism sheet on which a symmetric prism shape of 25 degrees is formed on the surface, the angle of installation inclination angle (described later): 16 degrees, the solar altitude: 18 degrees The emission angle was calculated using Snell's law when the prism surface was directed upward and when the prism surface was directed downward (see FIGS. 2 and 7). The refractive index of air is 1 regardless of the wavelength, the refractive index of PMMA is 1.51 when the wavelength is 400 nm, and 1.49 when the wavelength is 700 nm, and light is refracted from air to PMMA and from PMMA to air for each wavelength. And the angle of total reflection. When the prism sheet is installed with the prism surface facing upward, the incident angle (7-7) to the anti-incident side prism inclined surface is 55.95 degrees when the refractive index is 1.51, and the refractive index is 1.49. 56.03 degrees, exceeding the respective critical angles (41.47 degrees when the refractive index is 1.51 and 42.16 degrees when the refractive index is 1.49), resulting in total reflection. Total reflection does not occur when the prism surface is directed downward at the same installation inclination angle. The emission angle θ (10) at a refractive index of 400 nm and 700 nm was obtained by calculation based on Snell's law (Equation 1) below, and an irradiation position D (12) on a surface 10 m away was calculated. The results are summarized in Table 1.

ここで前記照射位置Ｄとは、例えば高さ１０ｍの建物の場合、その屋上に採光装置を設置した時の出射光が地面を照射する範囲の内で、建物との距離が最短となる照射端部の位置のことである。   Here, in the case of a building having a height of 10 m, for example, the irradiation position D is an irradiation end where the distance from the building is the shortest within the range in which the emitted light when the daylighting device is installed on the roof irradiates the ground. It is the position of the part.

スネルの法則：ｎ１×ｓｉｎθ1＝ｎ２×ｓｉｎθ2 （式１）
ｎ１：入射側の屈折率、θ1：入射角
ｎ２：出射側の屈折率、θ2：出射角
１０ｍ離れた面の照射位置Ｄ（ｍ）＝１０（ｍ）×ｔａｎθ （式２）
θ：出射角 Snell's law: n1 × sin θ 1 = n2 × sin θ 2 (Formula 1)
n1: refractive index on the incident side, θ 1 : incident angle n2: refractive index on the outgoing side, θ 2 : outgoing angle Irradiation position D (m) = 10 (m) × tan θ on the surface 10 m away (Formula 2)
θ: Output angle

Figure 2010067565
Figure 2010067565

この結果から、プリズムから１０ｍ離れた面上では、波長４００ｎｍと７００ｎｍの光は、それぞれプリズム面が上を向いている場合０．０６ｍ、下を向いている場合０．４６ｍのずれを生じることがわかり、プリズム面を上に向けて全反射を利用した方が虹模様が目立ちにくいことが説明できる。   From this result, on the surface 10 m away from the prism, light with a wavelength of 400 nm and 700 nm may cause a deviation of 0.06 m when the prism surface is facing upward and 0.46 m when the prism surface is facing downward, respectively. You can see that the rainbow pattern is less noticeable when the total reflection is used with the prism surface facing up.

プリズムシートを図１に示すように建物屋上に設置する際、プリズムシートの平面と水平面がなす角度を設置傾斜角（以降、「設置角」ということがある。）とする（図２の符号７−６に相当）。設置傾斜角が大きいと、建造物近傍を照射する条件では、照射面積が小さくなる。照射位置が建造物近傍では、設置傾斜角をαとすると、照射面積はパネル面積のｃｏｓα倍となり、設置傾斜角６０度を越えると照射面積は１／２以下となるため、設置傾斜角は６０度以下が好ましい。   When the prism sheet is installed on the building roof as shown in FIG. 1, the angle formed by the plane of the prism sheet and the horizontal plane is referred to as an installation inclination angle (hereinafter also referred to as “installation angle”) (reference numeral 7 in FIG. 2). Equivalent to -6). When the installation inclination angle is large, the irradiation area becomes small under the condition of irradiating the vicinity of the building. When the irradiation position is in the vicinity of the building, if the installation inclination angle is α, the irradiation area is cos α times the panel area, and if the installation inclination angle exceeds 60 degrees, the irradiation area becomes ½ or less. Degrees or less are preferred.

プリズム面を上に向けて設置する場合には、設置傾斜角が小さい方が全反射する光の割合が高くなるが、屋外の設置を考え設置傾斜角は５度以上が好ましい。設置傾斜角度は出射光の角度に影響を及ぼす要因であるため、プリズムの頂角によって適切な設置角を決め、ずれのないよう金具などでパネルを固定することができる。設置場所の条件に応じて、設置角を調整可能な構造としてもよい。   When installing with the prism surface facing upward, the smaller the installation inclination angle, the higher the proportion of light that is totally reflected, but the installation inclination angle is preferably 5 degrees or more in consideration of outdoor installation. Since the installation inclination angle is a factor that affects the angle of the emitted light, an appropriate installation angle is determined by the apex angle of the prism, and the panel can be fixed with metal fittings or the like so as not to be displaced. It is good also as a structure which can adjust an installation angle according to the conditions of an installation place.

プリズム面を上に向けてプリズムシートを屋外に配置すると、溝部分に汚れや雨水が残る可能性がある。プリズム列の上側に空気層を挟んで透明な平板を配置することが好ましい。   If the prism sheet is placed outdoors with the prism surface facing upward, dirt or rainwater may remain in the groove. It is preferable to arrange a transparent flat plate with an air layer sandwiched above the prism row.

（実施例１）
（プリズムシートの作製）
厚さ５ｍｍの透明なＰＭＭＡの板にプリズム列の形状を、切削加工して作製した金型を用いた熱プレスにより形成してプリズムシートを得た。プリズム列の形状は、太陽光の入射面側の頂角Ａ（７−３）が２５度、反対面側の頂角Ｂ（７−４）が２５度であるプリズムをピッチ２００μｍで透明板の片面に形成した。表中の頂角Ｃは二つのプリズム傾斜面のなす角であり、その角度は５０度である。 Example 1
(Production of prism sheet)
A prism sheet was obtained by forming the shape of the prism row on a transparent PMMA plate having a thickness of 5 mm by hot pressing using a die produced by cutting. The shape of the prism array is such that a prism having a vertex angle A (7-3) on the sunlight incident surface side of 25 degrees and a vertex angle B (7-4) on the opposite surface side of 25 degrees is formed on a transparent plate with a pitch of 200 μm. Formed on one side. The apex angle C in the table is an angle formed by two prism inclined surfaces, and the angle is 50 degrees.

（採光装置の作製）
図１に示すように、得られたプリズムシートを、高さ約１０ｍの建物の屋上の端部に、設置傾斜角：１６度で、プリズム面が上を向くように設置し、太陽光をプリズム面側から入射させる採光装置とした。太陽高度：約１８度の条件で、プリズムの稜線に垂直な方向が太陽方位とほぼ同じになるようにした。プリズムシートから出射した光が地面を照射した位置Ｄを、建物を基準に測定した。虹模様については照射位置を目視で評価した。結果を表２に示す。 (Production of daylighting device)
As shown in FIG. 1, the obtained prism sheet is installed at the end of the roof of a building with a height of about 10 m with an installation inclination angle of 16 degrees so that the prism surface faces upward, and the sunlight is prismatic. The daylighting device was made incident from the surface side. Solar altitude: Under the condition of about 18 degrees, the direction perpendicular to the ridgeline of the prism was made substantially the same as the solar direction. The position D at which the light emitted from the prism sheet irradiates the ground was measured with reference to the building. For the rainbow pattern, the irradiation position was evaluated visually. The results are shown in Table 2.

（比較例１）
実施例１と同様にして形成したプリズムシートを、プリズム面が下を向くよう設置し、太陽光をプリズム面の反対側から入射させた以外は、実施例１と同様にして測定、評価を行った。結果を表２に示す。 (Comparative Example 1)
A prism sheet formed in the same manner as in Example 1 is installed so that the prism surface faces downward, and sunlight is incident from the opposite side of the prism surface, and measurement and evaluation are performed in the same manner as in Example 1. It was. The results are shown in Table 2.

Figure 2010067565
Figure 2010067565

（実施例２）
頂角Ａ（７−３）、頂角Ｂ（７−４）がともに２５度のプリズム形状を持つＰＭＭＡからなるプリズムシートを、高さ１０ｍの位置にプリズム面を上向きとなるように設置角（７−６）：１０度で取り付けたと想定し、照射位置（１２）を計算により求めた。図８に測定時の状態を示し、測定結果を表３にまとめた。 (Example 2)
A prism sheet made of PMMA having a prism shape in which the apex angle A (7-3) and apex angle B (7-4) are both 25 degrees is set so that the prism surface faces upward at a height of 10 m. 7-6): The irradiation position (12) was calculated by assuming that it was attached at 10 degrees. FIG. 8 shows the state at the time of measurement, and the measurement results are summarized in Table 3.

照射位置０ｍはプリズムシートから垂直に照射面を照射している場合を示し、＋側は太陽と反対方向（図１における建物から離れる方向）を示す。ＰＭＭＡの屈折率は１．４９とし、太陽高度は、東京の冬至の太陽の南中した時の高度が約３１度であることを参考に、２０度、３０度、３５度の条件とした。   The irradiation position 0 m indicates a case where the irradiation surface is irradiated vertically from the prism sheet, and the + side indicates a direction opposite to the sun (a direction away from the building in FIG. 1). The refractive index of PMMA was 1.49, and the solar altitude was set to 20 degrees, 30 degrees, and 35 degrees with reference to the fact that the altitude when the sun in the winter solstice in Tokyo was about 31 degrees.

（実施例３）
頂角Ａ（７−３）が１５度、頂角Ｂ（７−４）が２５度であるプリズムと、頂角Ａ（７−３）が２５度、頂角Ｂ（７−４）が２８度であるプリズムを組み合わせたＰＭＭＡからなるプリズムシートを用いた以外は、実施例２と同様に照射位置（１２）を計算により求めた。図９に測定時の状態を示し、測定結果を表３にまとめた。プリズムを２種類用いているので照射位置（１２）は２箇所となる。 (Example 3)
A prism whose apex angle A (7-3) is 15 degrees and apex angle B (7-4) is 25 degrees, apex angle A (7-3) is 25 degrees, and apex angle B (7-4) is 28 The irradiation position (12) was obtained by calculation in the same manner as in Example 2 except that a prism sheet made of PMMA combined with a prism having a degree was used. FIG. 9 shows the state at the time of measurement, and the measurement results are summarized in Table 3. Since two types of prisms are used, there are two irradiation positions (12).

（実施例４）
頂角Ａ（７−３）が２０度、頂角Ｂ（７−４）が２５度であるプリズム列が設置角（７−６）：１５度で配置された部分と、頂角Ａが２０度、頂角Ｂが２５度であるプリズム列が設置角：８度で配置された部分とが組み合わされたプリズムシートを設置したとし、実施例２と同様に照射位置を計算により求めた。測定結果を表３にまとめた。 Example 4
A prism array in which the apex angle A (7-3) is 20 degrees and the apex angle B (7-4) is 25 degrees is a portion where the prism angle is set at an installation angle (7-6): 15 degrees, and the apex angle A is 20 Assuming that a prism sheet in which a prism array having an angle of apex B of 25 degrees is combined with a portion where the installation angle is 8 degrees is installed, the irradiation position is obtained by calculation in the same manner as in Example 2. The measurement results are summarized in Table 3.

（比較例２）
実施例２と同じプリズムシートを下向きに配置し、設置角を１５度にした以外は、実施例２と同様に照射位置を計算により求めた。図１１に測定時の状態を示し、測定結果を表３にまとめた。いずれの太陽高度においてもプリズムの屈折のみの出射光であり、虹模様が発生する。 (Comparative Example 2)
The irradiation position was obtained by calculation in the same manner as in Example 2 except that the same prism sheet as in Example 2 was placed downward and the installation angle was 15 degrees. FIG. 11 shows the state at the time of measurement, and the measurement results are summarized in Table 3. At any solar altitude, the emitted light is only refracted by the prism, and a rainbow pattern is generated.

Figure 2010067565
Figure 2010067565

（比較例３）
頂角Ａ（７−３）が４５度、頂角Ｂ（７−４）が４５度のプリズム形状（頂角Ｃは９０度）を持つＰＭＭＡからなるプリズムシートについて、太陽高度が３０度の場合に、プリズム面を上に向けて設置して、設置角（７−６）を１０度から６０度の範囲で変更して光の角度を計算した。いずれの設置角でもプリズム傾斜面での全反射は起こらない。設置角が５０度以上では屈折のみの光が地面に向かって出射するが、照射位置は、設置角５０度、建物高さ１０ｍの条件で建物より約６ｍ離れた位置であり、建物近くを虹模様なしで照射することはできない（図１２参照）。 (Comparative Example 3)
When the solar altitude is 30 degrees for a prism sheet made of PMMA having a prism shape (vertical angle C is 90 degrees) with an apex angle A (7-3) of 45 degrees and an apex angle B (7-4) of 45 degrees In addition, the angle of light was calculated by setting the prism surface facing upward and changing the installation angle (7-6) in the range of 10 degrees to 60 degrees. No total reflection occurs on the prism inclined surface at any installation angle. When the installation angle is 50 degrees or more, only refraction light is emitted toward the ground, but the irradiation position is about 6 m away from the building under the conditions of the installation angle of 50 degrees and the building height of 10 m. Irradiation without a pattern is not possible (see FIG. 12).

（比較例４）
設置角を変更した以外は比較例１と同様に測定、評価を行った。一部の光がプリズム傾斜面で全反射するが、地面の方向へは出射せず、設置角５０度の条件で屈折のみの光が建物より約５ｍ離れた位置を照射するが、建物近くを虹模様なしで照射することはできない（図１３参照）。 (Comparative Example 4)
Measurement and evaluation were performed in the same manner as in Comparative Example 1 except that the installation angle was changed. Although some light is totally reflected by the prism inclined surface, it is not emitted in the direction of the ground, and light with only refraction illuminates a position about 5m away from the building under the condition of an installation angle of 50 degrees. Irradiation without a rainbow pattern is not possible (see FIG. 13).

（比較例５）
頂角Ａ（７−３）が６５度、頂角Ｂ（７−４）が１８度であるプリズム形状を持つＰＭＭＡからなるプリズムシートを、プリズム面を上に向け、設置角（７−６）を１０度で設置したとして計算により光の角度を求めた。太陽高度３０度の条件で一部の光が全反射により地面を照射するが、残りの光はほぼ水平方向へ出射する。地面に向かう光の割合は１／３程度と効率が低下する（図１４参照）。 (Comparative Example 5)
A prism sheet made of PMMA having a prism shape with an apex angle A (7-3) of 65 degrees and an apex angle B (7-4) of 18 degrees is placed with the prism surface facing upward, and the installation angle (7-6) Was set at 10 degrees, and the angle of light was obtained by calculation. A part of light irradiates the ground by total reflection under the condition of a solar altitude of 30 degrees, but the remaining light is emitted almost horizontally. The efficiency decreases with the ratio of light traveling to the ground being about 1/3 (see FIG. 14).

本発明による一実施形態の採光装置の概略構造を説明する図。The figure explaining the schematic structure of the lighting apparatus of one Embodiment by this invention. 本発明による実施形態における光線利用の概要を説明する図。The figure explaining the outline | summary of utilization of the light ray in embodiment by this invention. プリズム形状（連続タイプ）を説明する図。The figure explaining prism shape (continuous type). プリズム形状（間欠タイプ）を説明する図。The figure explaining prism shape (intermittent type). プリズム形状（間欠タイプ）を説明する図。The figure explaining prism shape (intermittent type). プリズム形状（間欠タイプ）を説明する図。The figure explaining prism shape (intermittent type). プリズム形状（２種類以上のプリズム配置タイプ）を説明する図。The figure explaining prism shape (two or more types of prism arrangement types). プリズム形状（２種類以上のプリズム配置タイプ）を説明する図。The figure explaining prism shape (two or more types of prism arrangement types). プリズム形状（２種類以上のプリズム配置タイプ）を説明する図。The figure explaining prism shape (two or more types of prism arrangement types). マット又はシボ形状を付与したプリズムシートを説明する図。The figure explaining the prism sheet | seat which provided the mat | matte or grain shape. プリズム傾斜面を曲面としたプリズムシートを説明する図。The figure explaining the prism sheet which made the prism inclined surface the curved surface. 光線の出射角と照射位置を説明する図。The figure explaining the emission angle and irradiation position of a light ray. 実施例２の説明図。Explanatory drawing of Example 2. FIG. 実施例３の説明図。Explanatory drawing of Example 3. FIG. 実施例４の説明図。Explanatory drawing of Example 4. FIG. 比較例２の説明図。Explanatory drawing of the comparative example 2. FIG. 比較例３の説明図。Explanatory drawing of the comparative example 3. FIG. 比較例４の説明図。Explanatory drawing of the comparative example 4. FIG. 比較例５の説明図。Explanatory drawing of the comparative example 5. FIG.

符号の説明Explanation of symbols

１ 採光装置
２ 建造物
３ 太陽
４ 光線
５ 建造物による日陰
６ 採光装置による照射範囲
７−１ 入射側プリズム傾斜面
７−２ 反入射側プリズム傾斜面
７−３ 頂角Ａ
７−４ 頂角Ｂ
７−５ 出射面
７−６ 設置傾斜角（設置角）
７−７ 反入射側プリズム傾斜面への入射角
８ 水平面
９ 垂直面
１０ 出射角
１１ 垂直面（垂直高さ）
１２ 照射位置
１３ マット形成面
１４ 曲面 DESCRIPTION OF SYMBOLS 1 Daylighting device 2 Building 3 Sun 4 Ray 5 Shade by building 6 Irradiation range by daylighting device 7-1 Incident side prism inclined surface 7-2 Anti-incident side prism inclined surface 7-3 Vertex angle A
7-4 Vertical angle B
7-5 Outgoing surface 7-6 Installation tilt angle (installation angle)
7-7 Incident angle to the non-incident side prism inclined surface 8 Horizontal surface 9 Vertical surface 10 Output angle 11 Vertical surface (vertical height)
12 Irradiation position 13 Mat forming surface 14 Curved surface

Claims (8)

太陽光をプリズム面側から入射させ、その光路を変更して出射する採光装置に使用される採光用プリズムシートであって、
透明基体の片面側に、該透明基体の平面に対して二つの傾斜面をもつプリズム形状部が複数配列されたプリズム列を有し、
前記プリズム形状部の一方の傾斜面と前記透明基体の平面に対する垂線とがなす片側頂角Ａの角度が８度以上６０度以下の範囲にあり、
当該プリズム形状部の他方の傾斜面と前記垂線とがなす片側頂角Ｂの角度が８度以上６０度以下の範囲にあり、
前記二つの傾斜面がなす頂角Ｃの角度が１６度以上８９度以下である採光用プリズムシート。 A daylighting prism sheet used in a daylighting device that makes sunlight incident from the prism surface side, changes the optical path, and emits it,
On one side of the transparent substrate, there is a prism row in which a plurality of prism-shaped portions having two inclined surfaces with respect to the plane of the transparent substrate are arranged,
The angle of one side apex angle A formed by one inclined surface of the prism-shaped portion and a perpendicular to the plane of the transparent substrate is in the range of 8 degrees to 60 degrees,
The angle of the one-side apex angle B formed by the other inclined surface of the prism-shaped portion and the perpendicular is in the range of 8 degrees to 60 degrees,
A daylighting prism sheet in which the angle of the apex angle C formed by the two inclined surfaces is 16 degrees or more and 89 degrees or less. 前記頂角Ｃの角度が１６度以上７０度以下である、請求項１に記載の採光用プリズムシート。   The prism sheet for daylighting according to claim 1 whose angle of said apex angle C is 16 degrees or more and 70 degrees or less. 前記プリズム列において、頂角Ｃの角度が互いに異なるプリズム形状部が混在している、請求項１又は２に記載の採光用プリズムシート。   The daylighting prism sheet according to claim 1 or 2, wherein in the prism row, prism-shaped portions having different apex angles C are mixed. 第１の角度の頂角Ｃ−１を持つプリズム形状部からなる第１のプリズム列と、第１の角度と異なる第２の角度の頂角Ｃ−２を持つプリズム形状部からなる第２のプリズム列を有する、請求項１又は２に記載の採光用プリズムシート。   A first prism array having a prism shape portion having a first angle apex angle C-1 and a second prism shape portion having a second angle apex angle C-2 different from the first angle. The prism sheet for daylighting according to claim 1 or 2 which has a prism row. 前記プリズム列が形成された面とは反対側の面に、該反対側の面からの出射光を拡散する拡散材または拡散形状が形成されている、請求項１から４のいずれか一項に記載の採光用プリズムシート。   5. The diffusing material or diffusing shape for diffusing the light emitted from the opposite surface is formed on the surface opposite to the surface on which the prism row is formed. 5. The prism sheet for lighting as described. 前記プリズム形状部の一方の傾斜面から入射し、他方の傾斜面で全反射し、前記プリズム列が形成された面とは反対側の面から出射する光が拡散されるように、該プリズム形状部の少なくとも一方の傾斜面が曲面となっている、請求項１から５のいずれか一項に記載の採光用プリズムシート。   The prism shape is formed so that light incident from one inclined surface of the prism shape portion, totally reflected by the other inclined surface, and diffused from the surface opposite to the surface on which the prism row is formed is diffused. 6. The daylighting prism sheet according to claim 1, wherein at least one inclined surface of the portion is a curved surface. 太陽光を入射させ、その光路を変更して出射する採光装置であって、請求項１から７のいずれか一項に記載の採光用プリズムシートを具備する採光装置。   A daylighting apparatus that emits sunlight by changing its optical path, and comprising the daylighting prism sheet according to any one of claims 1 to 7. 前記採光用プリズムシートの平面が、水平面に対して傾斜して配置される、請求項７に記載の採光装置。   The daylighting apparatus according to claim 7, wherein a plane of the daylighting prism sheet is disposed to be inclined with respect to a horizontal plane.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011227341A (en) * 2010-04-21 2011-11-10 Toppan Printing Co Ltd Optical sheet, lighting unit, and display device
NL2008752C2 (en) * 2012-05-04 2013-11-06 Stichting Vu Vumc Device comprising a transparent structure, solar collector or greenhouse provided with such device.
WO2016175203A1 (en) * 2015-04-30 2016-11-03 シャープ株式会社 Daylighting slat and daylighting device
US10480736B2 (en) 2015-04-30 2019-11-19 Sharp Kabushiki Kaisha Daylighting system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011227341A (en) * 2010-04-21 2011-11-10 Toppan Printing Co Ltd Optical sheet, lighting unit, and display device
NL2008752C2 (en) * 2012-05-04 2013-11-06 Stichting Vu Vumc Device comprising a transparent structure, solar collector or greenhouse provided with such device.
WO2013165249A1 (en) * 2012-05-04 2013-11-07 Stichting Vu-Vumc Device comprising a transparent structure, solar collector or greenhouse provided with such device
WO2016175203A1 (en) * 2015-04-30 2016-11-03 シャープ株式会社 Daylighting slat and daylighting device
JPWO2016175203A1 (en) * 2015-04-30 2018-03-29 シャープ株式会社 Daylighting slat and daylighting device
US10344531B2 (en) 2015-04-30 2019-07-09 Sharp Kabushiki Kaisha Daylighting slat and daylighting device
US10480736B2 (en) 2015-04-30 2019-11-19 Sharp Kabushiki Kaisha Daylighting system

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