WO2018221579A1 - Optical integrator holder and optical integrator unit - Google Patents
Optical integrator holder and optical integrator unit Download PDFInfo
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- WO2018221579A1 WO2018221579A1 PCT/JP2018/020750 JP2018020750W WO2018221579A1 WO 2018221579 A1 WO2018221579 A1 WO 2018221579A1 JP 2018020750 W JP2018020750 W JP 2018020750W WO 2018221579 A1 WO2018221579 A1 WO 2018221579A1
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- optical integrator
- light
- refractive index
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- integrator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V15/00—Protecting lighting devices from damage
- F21V15/01—Housings, e.g. material or assembling of housing parts
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
Definitions
- the present invention relates to an optical integrator holder for holding an optical integrator and an optical integrator unit using the optical integrator holder.
- optical integrator incorporated in a projection display device.
- Optical integrators incorporated in projection display devices include rod integrators and fly eye integrators.
- the rod integrator In the rod integrator, light incident from one end face of the rod is reflected in-plane within the rod and overlapped on the exit surface to make the luminance distribution uniform.
- the rod integrator has an advantage that it can easily cope with the miniaturization of the projection display device as compared with the fly eye integrator, and is suitable for a projection display device using a light emitting element as a light source.
- rod integrator rods There are two types of rod integrator rods: solid rods such as glass rods and hollow rods made by bonding mirrors.
- solid rods such as glass rods
- hollow rods made by bonding mirrors In the hollow rod, light is reflected by using a reflecting surface of a mirror on which silver or aluminum or the like is vapor-deposited, so that a reflection loss occurs during repeated in-plane reflection.
- a solid rod has an advantage that reflection loss is less than that of a hollow rod because in-plane reflection is almost total reflection.
- the solid rods are randomly filled with scattering particles that have the function of scattering light, and light is made uniform using scattering.
- the technique which performs is disclosed (patent document 1). According to the technique of Patent Document 1, it is possible to realize an optical integrator that exhibits the same function with a more compact size compared to the case of using a conventional solid rod that makes light uniform by repeating total reflection. .
- the present invention solves the above-mentioned problems and improves light emission efficiency in an optical integrator unit using an optical integrator that makes light uniform by utilizing light scattering by scattering particles filled in a solid rod.
- the technology to do is provided.
- the present invention provides the following [1] to [8].
- the optical integrator includes a solid rod having a light incident surface, a light emitting surface that emits the light, and a side surface that connects the light incident surface and the light emitting surface.
- substantially parallel may be substantially parallel, may or may not mean complete parallelism, and allows an error within a range that does not significantly impair the effects of the invention.
- proximity means that it is a neighborhood with no contact.
- the optical integrator holder configured as described above is provided. By using it, the leakage light from the side surface of the optical integrator can be reflected by the reflecting surface of the optical integrator housing space and collected again in the optical integrator, and the light emission efficiency can be improved.
- the optical integrator unit 10 of the present embodiment includes a light source 1, an optical integrator 2 disposed on the optical axis of the light source 1, and an optical integrator accommodation space 3 for accommodating the optical integrator 2. It consists of an optical integrator holder 5.
- the present embodiment will be described as an integrator unit including a light source, the light source may be provided outside the integrator unit.
- the optical integrator housing space 3 has a reflecting surface 6 that regularly or irregularly reflects the leaked light from the side surface 9 of the optical integrator.
- the optical integrator 2 only needs to have an incident surface 7, an exit surface 8, and a side surface 9.
- Other shapes are not particularly limited, and for example, a rectangular or polygonal prism having a cross section, a truncated pyramid having a small incident side and a large emitting side, a circular column, or the like can be used.
- the incident surface 7 means a surface on which light from the light source 1 such as an LED is incident
- the exit surface 8 means a surface that emits incident light
- the side surface 9 means the incident surface 7 and It means the surface connecting the exit surface 8.
- the light integrator 2 of the present embodiment is made of a solid member containing scattering particles therein, and includes a scattering medium having a refractive index N1 and scattering particles having a refractive index N2 different from the refractive index N1.
- Part 11 A light ray having an incident angle larger than the critical angle cannot travel from a medium having a high refractive index to a medium having a low refractive index. Therefore, in an optical integrator consisting only of a medium having a refractive index N1, the in-plane reflection is almost totally reflected.
- leakage light Light leakage (hereinafter referred to as leakage light) does not occur, but in the light scattering unit 11 in which the medium having the refractive index N1 contains scattering particles having the refractive index N2 different from the refractive index N1, the leakage light Occurs.
- this leaked light is regularly reflected or irregularly reflected by the reflecting surface 6 of the optical integrator housing space 3 and collected inside the optical integrator 2, so that the light emission efficiency caused by the leaked light is reduced. By avoiding this, the light emission efficiency can be improved.
- the entire optical integrator 2 includes a light scattering portion 11.
- the incident surface 7 side is a total reflection part 12 made of only a medium having a refractive index N1
- the exit surface 8 side is a medium having a refractive index N1.
- the ratio between the total reflection portion 12 and the light scattering portion 11 is preferably 1: 1 to 10: 1, and more preferably 1.5: 1 to 5: 1.
- an arbitrary resin can be selected from a photocurable resin, a thermosetting resin, a thermoplastic resin, and the like.
- a photocurable resin the advantage that mixing with scattering particles is easy, the advantage that work efficiency is improved because a step such as cooling and drying is not required after curing, and a predetermined The advantage that it can be easily formed into a shape is obtained.
- the utilization efficiency of light can be improved by selecting acrylic resin or the like.
- the scattering particles having a refractive index of N2 particles made of plastic, glass, or other materials can be used.
- the scattering particles have a spherical shape or other shapes. Cost can be suppressed by using a general-purpose product in a spherical shape.
- the particle size of 90% or more of the scattering particles is preferably in the range of 0.5 ⁇ m or more and 5 ⁇ m or less. Light tends to scatter as the particle size becomes smaller, and if the scattering occurs excessively, the light extraction efficiency tends to decrease. On the other hand, as the particle size increases, light tends to become difficult to scatter. By keeping the particle size of the scattering particles in the above range, a sufficient light diffusion effect can be obtained without reducing the light extraction efficiency.
- Either the refractive index N1 or the refractive index N2 may be large, but the difference between the refractive index N1 and the refractive index N2 is preferably 0.005 or more.
- the difference between the refractive index N1 and the refractive index N2 is 0.005 or more and 0.015 or less, the specific gravity of the scattering particles and the solid member can be easily approached, and the scattering particles can be easily mixed with the solid member. Become. In addition, a sufficient light diffusion effect can be obtained.
- the content of the scattering particles is preferably 0.1 to 10% by volume, more preferably 0.5 to 3% by volume, and can be adjusted according to the uniformity and / or the amount of light emitted from the exit surface. it can.
- the light scattering portion 11 in which the medium having the refractive index N1 contains the scattering particles having the refractive index N2 it is possible to make the content of the scattering particles different so that more scattering particles are contained on the exit surface 5 side. .
- the light scattering unit 11 in which the scattering medium having the refractive index N2 is contained in the medium having the refractive index N1 has been described.
- the surface of the optical integrator 2 may be provided with an uneven shape to scatter light. .
- the optical integrator holder 5 has an optical integrator accommodating space 3 portion and a housing 4 portion.
- the optical integrator housing space 3 has a reflecting surface 6 that regularly reflects or irregularly reflects leaked light from the side surface of the optical integrator.
- the reflectance of the reflecting surface 6 is preferably as high as possible in a range exceeding 0%.
- the internal space surrounded by the housing 4 is used as the optical integrator housing space 3, and the wall surface of the housing 4 facing the optical integrator housing space 3 is used as the reflecting surface 6.
- the wall surface of the housing 4 the reflective surface 6
- an independent member reflector may be disposed between the wall surface of the housing 4 facing the optical integrator housing space 3 and the side surface 9 of the optical integrator 2 to form the reflecting surface 6.
- the reflecting surface 6 and the side surface 9 of the optical integrator 2 are preferably arranged in parallel and close to each other. By arranging in this way, the amount of light collected inside the optical integrator 2 can be effectively increased.
- substantially parallel means that it is only required to be substantially parallel, and it may or may not mean complete parallelism. Specifically, for example, an error within a range that is within a range of ⁇ 10 degrees to 10 degrees from the parallel direction and does not significantly impair the effects of the invention is allowed. Further, here, the proximity means that it is in the vicinity without contact. Specifically, for example, the gap (X) between the optical integrator 2 and the housing 4 is within a range of 0.001 mm to 1 mm, and an error within a range that does not significantly impair the effects of the invention is allowed. From the viewpoint of reducing light leakage, it is preferably 0.001 mm or more and 0.3 mm or less, and more preferably 0.001 mm or more and 0.1 mm or less.
- the reflective surface 6 is made of a highly reflective material having a high reflectance.
- the highly reflective material means a material having a reflectance of 85% or more.
- the reflectivity of the highly reflective material is preferably 88% or more, more preferably 90% or more.
- the reflective surface 6 can be obtained, for example, by plating or vapor-depositing a metal such as aluminum or silver. Moreover, the reflective surface 6 can also be obtained by comprising a white body made of white silicon or white polycarbonate resin. By configuring the reflecting surface 6 with the above metal or white body, the amount of light collected in the optical integrator 2 can be effectively increased.
- the reflective surface 6 of the inner wall surface of the housing 4 may be made of a highly reflective material, or the housing 4 itself may be made of a highly reflective material.
- the housing 4 itself By configuring the housing 4 itself with a highly reflective material and using the inner wall surface of the optical integrator housing space 3 formed in the housing as the reflecting surface 6, the effects of the present invention can be obtained with a simpler configuration.
- the front luminance of the optical integrator 2 was measured using the optical integrator unit 10 shown in FIGS.
- the optical integrator 2 has a quadrangular prism shape with a length of 4.15 mm, a height of 1.05 mm, and a width of 1.05 mm.
- the inside of the medium is filled with a medium having a high refractive index and a refractive index of 1.51, and particles having a high transparency and a refractive index of 1.59 are randomly distributed in the medium.
- Hitachi Chemical 951 (trade name) manufactured by Hitachi Chemical Co., Ltd. was used as the medium. This is a urethane acrylate-based photo-curing resin.
- Sekisui Plastics Co., Ltd. Techpolymer SSX-302ABE (trade name) was used.
- the optical integrator 2 was manufactured as follows. First, 0.6% of the total weight of fine particles was placed in a photo-curing resin and stirred sufficiently, and then defoamed. A metal plate having a thickness of 1.05 mm and a center of which was hollowed by a 60 mm square was manufactured, and a metal plate having both sides sandwiched between glass plates was used as a mold. As a result, a gap having a length of 60 mm, a width of 60 mm, and a depth of 1.05 mm is formed in the mold. The defoamed resin was poured into this void. At this time, air was prevented from entering. Thereafter, a UV lamp was irradiated through the glass to sufficiently cure the resin.
- the product was taken out and cut into a width of 1.05 mm and a length of 4.15 mm with a dicer (DAC552, manufactured by DISCO Corporation).
- the side surface was processed using a dicing blade having a particle size of # 5000 under the conditions of a rotation speed of 30,000 rpm and a cutting speed of 1 mm / s.
- the casing 4 was manufactured by cutting a 2 cm square white polycarbonate (Iupilon EHR3100, manufactured by Mitsubishi Engineering Plastics Co., Ltd.) so that the thickness was 3 mm.
- the shape is a column having an L-shaped cross section, and two of them are combined so as to surround the outer periphery of the side surface 9 of the optical integrator 2, thereby forming the optical integrator accommodation space 3.
- the gap (X) between the optical integrator 2 and the housing 4 can be easily adjusted. Further, by adopting the same shape, it is possible to easily perform the work of installing the reflector to be the reflection surface 6 at the location surrounding the outer periphery of the side surface 9 of the optical integrator 2 on the inner surface of the housing 4.
- the reflection surface 6 was formed by installing the sheet or tape shown in Table 1 below at a location surrounding the outer periphery of the side surface 9 of the optical integrator 2 on the inner surface of the housing 4.
- a white sheet was selected for the purpose of confirming the effect of diffuse reflection, and was affixed to the above location on the inner surface of the housing 4.
- Lumirror E20 manufactured by Toray Industries, Inc. was used as a white sheet. When light hits this surface, it was scattered and reflected, and the reflectance was about 90%.
- a silver sheet was selected for the purpose of confirming the effect of regular reflection, and was affixed to the above location on the inner surface of the housing 4.
- LED As the light source 1, an LED (LTRB R8SF manufactured by OSRAM) was used. One LED is mounted with three elements of red, blue, and green.
- the LED is placed in close contact with the center of the incident surface of the light integrator, the anode is shared, a 1 k ⁇ resistor is placed between the ground and the red element, and a 150 ⁇ resistor is placed between the blue element, and 2.7 V is applied to the LED to emit light.
- the luminance of the front surface of the light integrator was measured using the luminance meter 13.
- the gap (X) between the optical integrator holder 2 and the housing 4 was set to 0.1 mm.
- the luminance meter 13 a two-dimensional color luminance meter CA-1500 manufactured by Konica Minolta Co., Ltd. was used. The luminance was evaluated by an average value in the light integrator emission surface.
- Example 1 When a white sheet was installed on the outer periphery of the side surface of the optical integrator, the luminance was 33,160 cd / m 2 , which was about 9% higher than that without the holder (Comparative Example 2).
- Example 2 When a silver sheet was installed on the outer periphery of the side surface of the light integrator, the luminance was 33,970 cd / m 2 , which was about 11% higher than that without the holder (Comparative Example 2).
- Comparative Example 1 When black tape was installed on the outer periphery of the side surface of the optical integrator, the luminance was 30,150 cd / m 2 , which was almost the same as when there was no holder (Comparative Example 2).
- Example 1 and Example 2 having a reflecting surface in the optical integrator accommodating space, the solid rod is filled with scattering particles, and the light is homogenized using the scattered light.
- the light emission efficiency can be improved.
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Abstract
Description
特許文献1の技術によれば、全反射の繰り返しで光の均一化を行う従来の中実ロッドを用いる場合と比べて、よりコンパクトなサイズで同等の機能を奏する光インテグレータを実現することができる。 For solid rods, as a technology for reducing the size of projection display devices, the solid rods are randomly filled with scattering particles that have the function of scattering light, and light is made uniform using scattering. The technique which performs is disclosed (patent document 1).
According to the technique of
なお、本明細書において、光インテグレータの入射面に入射する光束量に対する、光インテグレータの出射面から出射する光束量の割合を光出射効率と定義する。 However, in the technique of
In this specification, the ratio of the amount of light emitted from the exit surface of the optical integrator to the amount of light incident on the entrance surface of the optical integrator is defined as the light exit efficiency.
[1] 光インテグレータ収容空間を有する光インテグレータホルダであって、前記光インテグレータ収容空間に、光インテグレータ側面からの漏れ光を正反射又は乱反射する反射面を有する、光インテグレータホルダ。
[2] 前記反射面が、前記光インテグレータ収容空間を構成する内壁面である、[1]に記載の光インテグレータホルダ。
[3] 前記反射面が、金属からなる、[1]又は[2]に記載の光インテグレータホルダ。
[4] 前記反射面が、白色体からなる、[1]又は[2]に記載の光インテグレータホルダ。
[5] [1]~[4]の何れか1つの光インテグレータホルダの光インテグレータ収容空間に光インテグレータを収容した光インテグレータユニットであって、
前記光インテグレータが、少なくともその一部に、光を散乱する光散乱部を有する光インテグレータユニット。
[6] 前記光インテグレータが、光を入射する入射面と、前記光を出射する出射面と、前記入射面と前記出射面とをつなぐ側面を有する中実ロッドからなり、
前記光散乱部は、屈折率N1の媒質に、前記屈折率N1とは異なる屈折率N2の散乱粒子とを含有してなる[5]に記載の光インテグレータユニット。
[7] 前記光インテグレータの前記側面と、前記反射面を、略平行にかつ近接して配置した、[6]に記載の光インテグレータユニット。ここで略平行とは、実質的に平行であればよく、完全な平行を意味してもしなくてもよく、発明の効果を著しく阻害しない範囲での誤差を許容するものである。また、近接とは、接触しない程度で近傍であることを意味する。
[8] 前記光インテグレータが、前記光散乱部と、前記屈折率N1の媒質のみからなり前記側面が全反射面である全反射部とを有する、[6]又は[7]に記載の光インテグレータユニット。 In order to solve the above problems, the present inventors have intensively studied. As a result, they have found that the above problem can be solved by using an optical integrator holder having a specific structure, and have completed the present invention. The present invention provides the following [1] to [8].
[1] An optical integrator holder having an optical integrator accommodating space, wherein the optical integrator accommodating space has a reflecting surface that regularly reflects or irregularly reflects leaked light from the side surface of the optical integrator.
[2] The optical integrator holder according to [1], wherein the reflection surface is an inner wall surface constituting the optical integrator housing space.
[3] The optical integrator holder according to [1] or [2], wherein the reflecting surface is made of metal.
[4] The optical integrator holder according to [1] or [2], wherein the reflecting surface is made of a white body.
[5] An optical integrator unit in which an optical integrator is accommodated in an optical integrator accommodation space of any one of the optical integrator holders according to [1] to [4],
An optical integrator unit, wherein the optical integrator has a light scattering portion for scattering light at least in part.
[6] The optical integrator includes a solid rod having a light incident surface, a light emitting surface that emits the light, and a side surface that connects the light incident surface and the light emitting surface.
The light integrator unit according to [5], wherein the light scattering unit includes a medium having a refractive index N1 and scattering particles having a refractive index N2 different from the refractive index N1.
[7] The optical integrator unit according to [6], wherein the side surface of the optical integrator and the reflecting surface are arranged substantially parallel and close to each other. Here, “substantially parallel” may be substantially parallel, may or may not mean complete parallelism, and allows an error within a range that does not significantly impair the effects of the invention. Moreover, proximity means that it is a neighborhood with no contact.
[8] The optical integrator according to [6] or [7], wherein the optical integrator includes the light scattering portion and a total reflection portion that includes only the medium having the refractive index N1 and the side surface is a total reflection surface. unit.
図1に示すように、本実施形態の光インテグレータユニット10は、光源1と、光源1の光軸上に配置される光インテグレータ2と、この光インテグレータ2を収容する光インテグレータ収容空間3を有する光インテグレータホルダ5からなる。本実施形態では、光源を含むインテグレータユニットとして説明するが、光源はインテグレータユニットの外部に設けることもできる。
光インテグレータ収容空間3は、光インテグレータ側面9からの漏れ光を正反射又は乱反射する反射面6を有する。 [Optical integrator unit]
As shown in FIG. 1, the
The optical
光インテグレータ2は、入射面7と出射面8と側面9を有すればよい。その他の形状は特に限定されないが、例えば、断面が矩形又は多角形の角柱、入射側が小さく出射側が大きい角錐台、円柱等の形状とすることができる。
本明細書において、入射面7とはLED等の光源1からの光を入射する面を意味し、出射面8とは入射した光を出射する面を意味し、側面9とは入射面7と出射面8をつなぐ面を意味する。 [Optical integrator]
The
In this specification, the
臨界角より大きい入射角を持つ光線は屈折率の高い媒質から屈折率の低い媒質へ進行できないため、屈折率N1の媒質のみからなる光インテグレータでは、面内反射がほぼ全反射となり、側面9からの光の漏れ(以下、漏れ光という)は発生しないが、屈折率N1の媒質に、前記屈折率N1とは異なる屈折率N2の散乱粒子とを含有してなる光散乱部11では、漏れ光が発生する。
本発明によれば、この漏れ光が、光インテグレータ収容空間3の反射面6で、正反射又は乱反射して光インテグレータ2の内部に回収されるため、漏れ光に起因する光出射効率の低下を回避し、光出射効率を改善することができる。 The
A light ray having an incident angle larger than the critical angle cannot travel from a medium having a high refractive index to a medium having a low refractive index. Therefore, in an optical integrator consisting only of a medium having a refractive index N1, the in-plane reflection is almost totally reflected. Light leakage (hereinafter referred to as leakage light) does not occur, but in the light scattering unit 11 in which the medium having the refractive index N1 contains scattering particles having the refractive index N2 different from the refractive index N1, the leakage light Occurs.
According to the present invention, this leaked light is regularly reflected or irregularly reflected by the reflecting
その他の実施形態として、図2に示すように、入射面7側を、屈折率N1の媒質のみからなる全反射部12とし、出射面8側を、屈折率N1の媒質に、前記屈折率N1とは異なる屈折率N2の散乱粒子を含有してなる光散乱部11とすることもできる。
図2に示すように、光インテグレータ2の入射面7側を全反射部12とし、出射面8側を光散乱部11とすることで、光出射効率を更に向上させることができる。
全反射部12と光散乱部11の比率は、1:1~10:1であることが好ましく、1.5:1~5:1がより好ましい。 In the embodiment shown in FIG. 1, the entire
As another embodiment, as shown in FIG. 2, the
As shown in FIG. 2, by making the
The ratio between the total reflection portion 12 and the light scattering portion 11 is preferably 1: 1 to 10: 1, and more preferably 1.5: 1 to 5: 1.
屈折率N1の媒質に屈折率N2の散乱粒子を含有してなる光散乱部11内において、散乱粒子の含有率に差をつけて、出射面5側で散乱粒子をより多く含有させることもできる。
上記の実施形態では、屈折率N1の媒質に屈折率N2の散乱粒子を含有してなる光散乱部11について説明したが、光インテグレータ2の表面に凹凸形状をつけて光を散乱させることもできる。 The content of the scattering particles is preferably 0.1 to 10% by volume, more preferably 0.5 to 3% by volume, and can be adjusted according to the uniformity and / or the amount of light emitted from the exit surface. it can.
In the light scattering portion 11 in which the medium having the refractive index N1 contains the scattering particles having the refractive index N2, it is possible to make the content of the scattering particles different so that more scattering particles are contained on the
In the above-described embodiment, the light scattering unit 11 in which the scattering medium having the refractive index N2 is contained in the medium having the refractive index N1 has been described. However, the surface of the
光インテグレータホルダ5は、光インテグレータ収容空間3部分と、筐体4部分を有する。
光インテグレータ収容空間3は、光インテグレータ側面からの漏れ光を正反射又は乱反射させる反射面6を有する。反射面6の反射率は、0%超の範囲で高いほど好ましい。 [Optical integrator holder]
The
The optical
その他の実施形態として、光インテグレータ収容空間3に面した筐体4の壁面と、光インテグレータ2の側面9との間に、独立部材の反射体を配置して反射面6とすることもできる。
反射面6と光インテグレータ2の側面9とは、平行にかつ近接して配置することが好ましい。このように配置することにより、光インテグレータ2の内部に回収される光量を効果的に増加させることができる。ここで略平行とは、実質的に平行であればよく、完全な平行を意味してもしなくてもよいことを意味する。具体的には、例えば、平行方向から-10度以上10度以下の範囲内の方向であり、発明の効果を著しく阻害しない範囲での誤差は許容される。また、ここで近接とは、接触しない程度で近傍であることを意味する。具体的には、例えば、光インテグレータ2と筐体4の間隙(X)が0.001mm以上1mm以下の範囲内であり、発明の効果を著しく阻害しない範囲での誤差は許容される。光漏れを少なくする観点から、0.001mm以上0.3mm以下が好ましく、0.001mm以上0.1mm以下が更に好ましい。 In this embodiment, the internal space surrounded by the
As another embodiment, an independent member reflector may be disposed between the wall surface of the
The reflecting
本明細書において、高反射材料とは、反射率が85%以上の材料を意味する。高反射材料の反射率は、好ましくは88%以上、より好ましくは90%以上である。 The
In this specification, the highly reflective material means a material having a reflectance of 85% or more. The reflectivity of the highly reflective material is preferably 88% or more, more preferably 90% or more.
反射面6を上記の金属や白色体で構成することにより、光インテグレータ2の内部に回収される光量を効果的に増加させることができる。 The
By configuring the reflecting
筐体4自体を高反射材料で構成し、その筐体内に形成する光インテグレータ収容空間3の内壁面を反射面6として用いることで、より簡易な構成で本発明の効果を得ることができる。 Only the
By configuring the
光インテグレータ2は、長さ4.15mm、高さ1.05mm、幅1.05mmの四角柱の形状を有する。その内部は、透明度の高い、屈折率1.51の媒質で満たされ、その媒質中には、透明度の高い、屈折率1.59の粒子がランダムに分布している。媒質として日立化成(株)製ヒタロイド9501(商品名)を使用した。これは、ウレタンアクリレート系の光硬化樹脂である。また、粒子として、積水化成品工業(株)製テクポリマーSSX-302ABE(商品名)を使用した。これは、架橋ポリスチレン樹脂の微粒子であり、形状は球形、平均直径は2μmで、全体の95%以上の粒子が平均直径と0.5μm以内の差である単分散粒子である。 (Specification of optical integrator)
The
光インテグレータ2は、以下のように製造した。まず、光硬化樹脂の中に、全体の重量の0.6%の微粒子を入れ十分攪拌し、その後脱泡した。厚み1.05mmの金属板の中央を60mm角でくりぬいたものを製作し、その両面をガラス板で挟んだものを型とした。これにより、型内に長さ60mm、幅60mm、深さ1.05mmの空隙ができる。この空隙に上記脱泡後の樹脂を流し込んだ。このとき中に空気が入らないようにした。その後、ガラス越しにUVランプを照射させ、樹脂を十分に硬化させた。その後、製品を取り出して、ダイサー(DAC552、(株)ディスコ製)にて、幅1.05mm、長さ4.15mmに切り出した。側面は粒径#5000のダイシングブレードを用い、回転数30,000rpm、切削速度1mm/sの条件で加工した。 (Optical integrator manufacturing method)
The
筐体4は、2cm角の白色ポリカーボネート(ユーピロンEHR3100、三菱エンジニアリングプラスチックス(株)製)を肉厚が3mmとなるように切削することにより製作した。形状はL字型断面をもつ柱体とし、これを2つ組み合わせて、光インテグレータ2の側面9の外周を囲うように配置して、光インテグレータ収容空間3とした。このように、L字型断面をもつ柱体を2つ組合せて光インテグレータ収容空間3を形成することにより、光インテグレータ2と筐体4の間隙(X)の調整が容易となる。また、同形状とすることにより、筐体4の内面で、光インテグレータ2の側面9の外周を囲う箇所に、反射面6となる反射体を設置する作業を簡単に行うことができる。 (Specifications of the housing that constitutes the optical integrator holder)
The
反射面6は、下記表1に示すシート又はテープを、筐体4の内面で、光インテグレータ2の側面9の外周を囲う箇所に設置して形成した。
実施例1では、拡散反射の効果確認を目的に白色シートを選定し、筐体4の内面の上記箇所に貼り付けた。白色シートとして、東レ(株)製ルミラーE20を使用した。この面に光が当たると散乱反射し、その反射率は約90%であった。
実施例2では、正反射の効果確認を目的に銀色シートを選定し、筐体4の内面の上記箇所に貼り付けた。銀色シートとして、きもと(株)製レフホワイトRW125を使用した。この面に光が当たると正反射し、その反射率は約90%であった。
比較例1では、光が反射しない場合の確認を目的に黒色テープを選定し、筐体4の内面の上記箇所に貼り付けた。黒色テープとして、ニチバン(株)製ビニールテープVT-196を使用した。 (Reflective surface)
The
In Example 1, a white sheet was selected for the purpose of confirming the effect of diffuse reflection, and was affixed to the above location on the inner surface of the
In Example 2, a silver sheet was selected for the purpose of confirming the effect of regular reflection, and was affixed to the above location on the inner surface of the
In Comparative Example 1, a black tape was selected for the purpose of confirming that light was not reflected, and was affixed to the above location on the inner surface of the
光源1として、LED(OSRAM社製 LTRB R8SF)を使用した。1つのLEDに赤、青、緑の3素子が搭載されたものである。 (light source)
As the
LEDを光インテグレータの入射面中心に密着させて配置し、アノードを共通にして、グランドと赤色素子の間には1kΩ、青色素子には150Ωの抵抗を挟み、LEDに2.7V印加して発光させ、光インテグレータ2を、前記L字型断面をもつ柱体で囲ったうえで、輝度計13を用いて光インテグレータの出射面の正面輝度を測定した。
このとき、光インテグレータホルダ2と筐体4の間隙(X)は0.1mmに設定した。
輝度計13は、コニカミノルタ(株)製2次元色彩輝度計CA-1500を使用した。輝度は、光インテグレータ出射面内の平均値で評価した。 (Brightness measurement)
The LED is placed in close contact with the center of the incident surface of the light integrator, the anode is shared, a 1 kΩ resistor is placed between the ground and the red element, and a 150 Ω resistor is placed between the blue element, and 2.7 V is applied to the LED to emit light. Then, after the
At this time, the gap (X) between the
As the
評価結果を表1に示す。
実施例1:光インテグレータ側面外周に白色シートを設置したとき、輝度は33,160cd/m2となり、ホルダーのないとき(比較例2)と比較して約9%の輝度上昇となった。
実施例2光インテグレータ側面外周に銀色シートを設置したとき、輝度は33,970cd/m2となり、ホルダーのないとき(比較例2)と比較して約11%の輝度上昇となった。
比較例1:光インテグレータ側面外周に黒色テープを設置したとき、輝度は30,150cd/m2となり、ホルダーのないとき(比較例2)とほとんど変わらなかった。 (Evaluation results)
The evaluation results are shown in Table 1.
Example 1: When a white sheet was installed on the outer periphery of the side surface of the optical integrator, the luminance was 33,160 cd / m 2 , which was about 9% higher than that without the holder (Comparative Example 2).
Example 2 When a silver sheet was installed on the outer periphery of the side surface of the light integrator, the luminance was 33,970 cd / m 2 , which was about 11% higher than that without the holder (Comparative Example 2).
Comparative Example 1: When black tape was installed on the outer periphery of the side surface of the optical integrator, the luminance was 30,150 cd / m 2 , which was almost the same as when there was no holder (Comparative Example 2).
2 光インテグレータ
3 光インテグレータ収容空間
4 筐体
5 光インテグレータホルダ
6 反射面
7 入射面
8 出射面
9 側面
10 光インテグレータユニット
11 光散乱部
12 全反射部
13 輝度計
DESCRIPTION OF
Claims (8)
- 光インテグレータ収容空間を有する光インテグレータホルダであって、
前記光インテグレータ収容空間に、光インテグレータ側面からの漏れ光を正反射又は乱反射する反射面を有する、光インテグレータホルダ。 An optical integrator holder having an optical integrator accommodation space,
An optical integrator holder having a reflection surface for specularly or irregularly reflecting leakage light from the side surface of the optical integrator in the optical integrator accommodation space. - 前記反射面が、前記光インテグレータ収容空間を構成する内壁面である、請求項1に記載の光インテグレータホルダ。 The optical integrator holder according to claim 1, wherein the reflecting surface is an inner wall surface constituting the optical integrator accommodating space.
- 前記反射面が、金属からなる、請求項1又は2に記載の光インテグレータホルダ。 The optical integrator holder according to claim 1 or 2, wherein the reflecting surface is made of metal.
- 前記反射面が、白色体からなる、請求項1又は2に記載の光インテグレータホルダ。 The optical integrator holder according to claim 1 or 2, wherein the reflecting surface is made of a white body.
- 請求項1~4の何れか1項の光インテグレータホルダの光インテグレータ収容空間に光インテグレータを収容した光インテグレータユニットであって、
前記光インテグレータが、少なくともその一部に、光を散乱する光散乱部を有する光インテグレータユニット。 An optical integrator unit in which an optical integrator is accommodated in the optical integrator accommodating space of the optical integrator holder according to any one of claims 1 to 4,
An optical integrator unit, wherein the optical integrator has a light scattering portion for scattering light at least in part. - 前記光インテグレータが、光を入射する入射面と、前記光を出射する出射面と、前記入射面と前記出射面とをつなぐ側面を有する中実ロッドからなり、
前記光散乱部は、屈折率N1の媒質に、前記屈折率N1とは異なる屈折率N2の散乱粒子を含有してなる請求項5に記載の光インテグレータユニット。 The optical integrator comprises a solid rod having a light incident surface, a light emitting surface that emits the light, and a side surface that connects the light incident surface and the light emitting surface.
6. The light integrator unit according to claim 5, wherein the light scattering unit includes scattering particles having a refractive index N2 different from the refractive index N1 in a medium having a refractive index N1. - 前記光インテグレータの前記側面と、前記反射面を、略平行にかつ近接して配置した、請求項6に記載の光インテグレータユニット。 The optical integrator unit according to claim 6, wherein the side surface of the optical integrator and the reflecting surface are arranged substantially parallel and close to each other.
- 前記光インテグレータが、前記光散乱部と、前記屈折率N1の媒質のみからなり前記側面が全反射面である全反射部とを有する、請求項6又は7に記載の光インテグレータユニット。 The optical integrator unit according to claim 6 or 7, wherein the optical integrator includes the light scattering portion and a total reflection portion that is formed only of the medium having the refractive index N1 and the side surface is a total reflection surface.
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JP7461159B2 (en) | 2020-02-21 | 2024-04-03 | 浜松ホトニクス株式会社 | Prism rod holder, laser module, laser processing equipment and holding structure |
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- 2018-05-30 WO PCT/JP2018/020750 patent/WO2018221579A1/en active Application Filing
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JP2005504354A (en) * | 2001-10-01 | 2005-02-10 | スリーエム イノベイティブ プロパティズ カンパニー | Support channel for use with optical fiber |
JP2012253815A (en) * | 2012-08-28 | 2012-12-20 | Mitsubishi Electric Corp | Image reading line light source and light guide unit |
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JP7461159B2 (en) | 2020-02-21 | 2024-04-03 | 浜松ホトニクス株式会社 | Prism rod holder, laser module, laser processing equipment and holding structure |
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