JPH10239520A - Polarized beam splitter - Google Patents
Polarized beam splitterInfo
- Publication number
- JPH10239520A JPH10239520A JP4679797A JP4679797A JPH10239520A JP H10239520 A JPH10239520 A JP H10239520A JP 4679797 A JP4679797 A JP 4679797A JP 4679797 A JP4679797 A JP 4679797A JP H10239520 A JPH10239520 A JP H10239520A
- Authority
- JP
- Japan
- Prior art keywords
- light
- beam splitter
- optical
- reflected light
- splitter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Polarising Elements (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、光信号等のビーム
光を分離するとともに、この分離したビーム光をさらに
偏波面によって分離する機能をもった偏光ビームスプリ
ッタに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarizing beam splitter having a function of separating a light beam such as an optical signal and separating the separated light beam by a plane of polarization.
【０００２】[0002]
【従来の技術】近年、光信号を用いた情報伝達は、光デ
ィスク、光カード、レーザーを使った光学センサ、光通
信等の分野で広く使用されている。これらの装置におい
て、光信号を偏波面によって分離する機能をもった偏光
分離素子が用いられている。2. Description of the Related Art In recent years, information transmission using optical signals has been widely used in fields such as optical disks, optical cards, optical sensors using lasers, and optical communications. In these apparatuses, a polarization separation element having a function of separating an optical signal by a plane of polarization is used.
【０００３】例えば、物質の表面での光の反射では、偏
波面を回転させる旋光現象（カー効果）があり、光を透
過する物質では透過時に旋光現象が生じるものがある。
そして、光ディスクや光学センサは、この現象を利用し
て情報を読み取るため、偏光分離素子が使用されるので
ある。[0003] For example, in the reflection of light on the surface of a substance, there is an optical rotation phenomenon (Kerr effect) that rotates the plane of polarization, and in a substance that transmits light, an optical rotation phenomenon occurs when transmitted.
An optical disc or an optical sensor uses a polarization separation element to read information using this phenomenon.
【０００４】また、光通信の分野でも、光の偏波面によ
って信号光を使い分けたり、偏波面によって信号光の通
過特性を制御したりするため、偏光を分離したり合成し
たりする必要があり、偏光分離素子が使用されている。Also, in the field of optical communication, it is necessary to separate or combine polarizations in order to properly use signal light depending on the plane of polarization of light and to control the transmission characteristics of signal light according to the plane of polarization. A polarization splitting element is used.
【０００５】ここで、光ディスクの読み取り装置の概略
構造を図５に示すように、レーザーダイオード１４から
出射された光信号２０は、ビームスプリッタ１１を通過
して光ディスク１７で反射し、反射した光信号２１は再
度ビームスプリッタ１１にて反射し、この反射光が偏光
分離素子１２で二つの偏光２１ａ、２１ｂに分離され、
それぞれフォトディテクター１５、１６で検知するよう
になっている。つまり、光ディスク１７で反射した光信
号２１の旋光現象をフォトディテクター１５、１６で検
知することによって、光ディスク１７の情報を読み取る
ようになっている。[0005] Here, as shown in FIG. 5, the schematic structure of an optical disk reading device, an optical signal 20 emitted from a laser diode 14 passes through a beam splitter 11, is reflected by an optical disk 17, and is reflected by the optical signal. 21 is reflected again by the beam splitter 11, and the reflected light is split into two polarized lights 21 a and 21 b by the polarization splitting element 12.
Photodetectors 15 and 16 respectively detect the light. That is, the information on the optical disk 17 is read by detecting the optical rotation phenomenon of the optical signal 21 reflected by the optical disk 17 by the photodetectors 15 and 16.
【０００６】上記ビームスプリッタ１１と偏光分離素子
１２部分の詳細構造を図４（ａ）に示す。ビームスプリ
ッタ１１は、ガラスの三角柱状体からなる二つの透光性
部材３、３を互いの斜面で接合して、この斜面をスプリ
ッタ面２となしたものであり、一方偏光分離素子１２
は、二つのガラス製の透光性部材３’、３’の間にＳｉ
Ｏ2 、ＴｉＯ2 等の誘電体多層膜からなる偏光分離膜４
を介在させて接合したものである。そして、上記ビーム
スプリッタ１１の反射光が通過する位置に上記偏光分離
素子１２を接合して偏光ビームスプリッタが構成され
る。FIG. 4A shows a detailed structure of the beam splitter 11 and the polarization splitting element 12. The beam splitter 11 is formed by joining two translucent members 3, 3 each formed of a triangular prism body made of glass to each other at an inclined surface to form the inclined surface 2 as a splitter surface 2.
Is Si between two glass translucent members 3 ', 3'.
Polarization separation film 4 made of a dielectric multilayer film such as O 2 and TiO 2
Are bonded together. Then, the polarization splitting element 12 is joined to a position where the reflected light of the beam splitter 11 passes, thereby forming a polarization beam splitter.
【０００７】そのため、光ディスク１７にて反射した光
信号２１がビームスプリッタ１１に入射すると、一部は
透過するが、残部がスプリッタ面２で反射する。この反
射した光信号２１は偏光分離素子１２の偏光分離膜４で
互いに直交する二つの偏光２１ａ、２１ｂに分離される
ことになる。For this reason, when the optical signal 21 reflected by the optical disk 17 enters the beam splitter 11, a part of the signal is transmitted, but the rest is reflected by the splitter surface 2. The reflected optical signal 21 is split by the polarization splitting film 4 of the polarization splitting element 12 into two orthogonal polarizations 21a and 21b.
【０００８】また、同様の作用をなすために、図４
（ｂ）に示すように、上記偏光分離素子１２の代わり
に、結晶材料を用いたウォラストンプリズム１３を配置
することもできる。このウォラストンプリズム１３は、
複屈折特性を持った結晶材料からなるものであり、入射
した光信号２１は、結晶の光軸と平行な方向に振動する
正常光と、光軸と垂直な方向に振動する異常光に分離
し、それぞれ異なる屈折率にしたがって伝搬するため、
互いに直交する二つの偏光２１ａ、２１ｂに分離される
ことになる。In order to achieve the same effect, FIG.
As shown in (b), a Wollaston prism 13 using a crystal material can be arranged instead of the polarization separation element 12. This Wollaston prism 13
It is made of a crystal material having birefringence characteristics. The incident optical signal 21 is separated into normal light oscillating in a direction parallel to the optical axis of the crystal and extraordinary light oscillating in a direction perpendicular to the optical axis. , Each propagate according to a different refractive index,
The light is separated into two polarized lights 21a and 21b orthogonal to each other.
【０００９】[0009]
【発明が解決しようとする課題】ところで、近年、これ
らの光学素子は小型化、低コスト化が求められている。
これに対し、図４に示すような偏光ビームスプリッタで
は、ビームスプリッタ１１と、偏光分離素子１２又はウ
ォラストンプリズム１３の二つの素子が必要であるた
め、全体の寸法が大きくなり、小型化が困難となるだけ
でなく、コストが高くなり、上記要求特性を満足できな
かった。In recent years, these optical elements have been required to be reduced in size and cost.
On the other hand, the polarization beam splitter as shown in FIG. 4 requires two elements, the beam splitter 11, the polarization splitting element 12, and the Wollaston prism 13, so that the overall size becomes large and miniaturization is difficult. In addition, the cost was increased, and the above required characteristics could not be satisfied.
【００１０】特に図４（ｂ）に示すウォラストンプリズ
ム１３を用いたものでは、全体を小型化するために、ウ
ォラストンプリズム１３を小さくすると、偏光２１ａ、
２１ｂの分離角が小さくなって偏光分離機能が低下する
という問題があった。In particular, in the case of using the Wollaston prism 13 shown in FIG. 4B, if the Wollaston prism 13 is made smaller in order to reduce the size of the whole, the polarization 21a,
There has been a problem that the separation angle of 21b is reduced and the polarization separation function is reduced.
【００１１】また、図４（ａ）に示すように、偏光分離
膜４を用いて偏光分離を行った場合、高い偏光分離機能
を得られないという問題もあった。Further, as shown in FIG. 4A, when polarization separation is performed using the polarization separation film 4, there is a problem that a high polarization separation function cannot be obtained.
【００１２】[0012]
【課題を解決するための手段】そこで本発明は、ビーム
光を透過光と反射光に分離するスプリッタ面を有する透
光性部材の、上記反射光が通過する位置に、複屈折部材
を接合一体化して偏光ビームスプリッタを構成したこと
を特徴とする。SUMMARY OF THE INVENTION Accordingly, the present invention provides a birefringent member integrally joined to a translucent member having a splitter surface for separating beam light into transmitted light and reflected light, at a position where the reflected light passes. To form a polarization beam splitter.
【００１３】また、本発明は、上記透光性部材と複屈折
率部材とをほぼ同等の屈折率を持った材質で形成し、こ
れらの間をほぼ同等の屈折率を有する透光性接着剤で接
合したことを特徴とする。Further, according to the present invention, the translucent member and the birefringent member are formed of a material having substantially the same refractive index, and a translucent adhesive having substantially the same refractive index is provided therebetween. It is characterized by being joined by.
【００１４】[0014]
【作用】本発明によれば、透光性部材と複屈折率部材と
を接合し、ビームスプリッタとウォラストンプリズムを
一体化したため、部品点数を小さくして全体を小型化
し、低コスト化できる。また、結晶材料を比較的大きく
形成できるため、偏光分離機能を向上できる。According to the present invention, the translucent member and the birefringent member are joined, and the beam splitter and the Wollaston prism are integrated, so that the number of parts can be reduced, the whole can be reduced in size, and the cost can be reduced. In addition, since the crystal material can be formed relatively large, the polarization separation function can be improved.
【００１５】[0015]
【発明の実施の形態】以下、本発明の実施形態を図によ
って説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.
【００１６】図１は、偏光ビームスプリッタ１０を、光
信号２１の透過方向側面から見た図である。この偏光ビ
ームスプリッタ１０は、ガラス等の三角柱状体からなる
透光性部材３と、結晶材料の三角柱状体からなる複屈折
率部材１とを、それぞれ斜面同士を当接して接合し、こ
の斜面をスプリッタ面２としたものである。FIG. 1 is a diagram of the polarization beam splitter 10 as viewed from the side in the transmission direction of the optical signal 21. The polarizing beam splitter 10 is formed by joining a translucent member 3 made of a triangular prism made of glass or the like and a birefringent member 1 made of a triangular prism made of a crystalline material by contacting their slopes with each other. Is the splitter surface 2.
【００１７】また、複屈折部材１は、サファイア、４ホ
ウ酸リチウム等の複屈折特性を有する結晶材料からな
る。ここで複屈折特性を有する結晶材料とは、結晶の光
軸に平行な方向に振動する正常光と、光軸に垂直な方向
に振動する異常光によって、異なる屈折率を有する材質
のことである。そして、この偏光ビームスプリッタ１０
では、光信号２１が透過する方向（図面の上下方向）に
複屈折部材１の光軸が向くように配置されている。The birefringent member 1 is made of a crystalline material having birefringent characteristics such as sapphire and lithium borate. Here, the crystal material having birefringence characteristics is a material having different refractive indexes depending on normal light vibrating in a direction parallel to the optical axis of the crystal and extraordinary light vibrating in a direction perpendicular to the optical axis. . Then, the polarization beam splitter 10
In the example, the birefringent member 1 is arranged such that the optical axis of the birefringent member 1 is oriented in a direction in which the optical signal 21 is transmitted (vertical direction in the drawing).
【００１８】いま、複屈折部材１側から入射した光信号
２１は、結晶材料の光軸にそった方向であるため、その
まま通過し、スプリッタ面２で透過光と反射光に分離さ
れる。そして、反射光は、再度、複屈折部材１内を通過
するが、この時は光軸とある角度で交差する方向に通過
するため、正常光と異常光に分離し、それぞれ異なる屈
折率で伝搬することから、二つの互いに直交する偏光２
１ａと２１ｂに分離することができるのである。Since the optical signal 21 incident from the birefringent member 1 is in the direction along the optical axis of the crystal material, it passes through as it is, and is separated into transmitted light and reflected light by the splitter surface 2. Then, the reflected light passes through the birefringent member 1 again, but at this time, because it passes in a direction crossing the optical axis at a certain angle, it is separated into normal light and extraordinary light, and propagates with different refractive indexes. The two mutually orthogonal polarizations 2
It can be separated into 1a and 21b.
【００１９】次に、この偏光ビームスプリッタ１０を光
ディスクの読み取り装置に応用した例を説明する。図２
に示すように、レーザーダイオード１４から出射された
光信号２０は、偏光ビームスプリッタ１０を通過して光
ディスク１７で反射し、反射した光信号２１は再度偏光
ビームスプリッタ１０に入射し、この反射光が上述した
ように二つの偏光２１ａ、２１ｂに分離され、それぞれ
フォトディテクター１５、１６で検知するようになって
いる。Next, an example in which the polarization beam splitter 10 is applied to an optical disk reader will be described. FIG.
As shown in (2), the optical signal 20 emitted from the laser diode 14 passes through the polarizing beam splitter 10 and is reflected by the optical disk 17, and the reflected optical signal 21 is again incident on the polarizing beam splitter 10, and the reflected light is As described above, the light is separated into two polarized lights 21a and 21b, and is detected by the photodetectors 15 and 16, respectively.
【００２０】この時、上述したように、偏光ビームスプ
リッタ１０のうち複屈折部材１は、光軸が光信号２０、
２１の透過方向と一致するように配置しているため、透
過する光信号２０、２１はそのまま透過させ、反射光の
みを二つの偏光２１ａ、２１ｂに分離できるのである。At this time, as described above, the birefringent member 1 of the polarizing beam splitter 10 has an optical axis whose optical axis is
Since they are arranged so as to match the transmission direction of 21, the transmitted optical signals 20, 21 can be transmitted as they are, and only the reflected light can be separated into two polarized lights 21a, 21b.
【００２１】このように、本発明の偏光ビームスプリッ
タ１０は、光信号２１を透過光と反射光に分離するとと
もに、反射光をさらに二つの偏光２１ａ、２１ｂに分離
することができる。しかも、この偏光ビームスプリッタ
１０は、図４に示す従来構造のように二つの素子を必要
とせず、従来のビームスプリッタ１１と同じ寸法のみで
良いことから、大幅に小型化することができ、低コスト
とできる。しかも、結晶材料からなる複屈折部材１は比
較的大きく形成できるため、偏光分離機能を向上するこ
とができる。As described above, the polarization beam splitter 10 of the present invention can separate the optical signal 21 into the transmitted light and the reflected light, and can further separate the reflected light into two polarized lights 21a and 21b. In addition, the polarization beam splitter 10 does not require two elements as in the conventional structure shown in FIG. 4 and only needs to have the same dimensions as the conventional beam splitter 11, so that the size can be significantly reduced, and Can be cost. In addition, since the birefringent member 1 made of a crystalline material can be formed relatively large, the polarization separation function can be improved.
【００２２】次に、本発明の他の実施形態を説明する。Next, another embodiment of the present invention will be described.
【００２３】図３に示す偏光ビームスプリッタ１０は、
ガラス等からなる透光性部材３と結晶材料からなる複屈
折部材１を共に四角柱状体として接合したものである
が、図１の実施形態と異なり、スプリッタ面２は透光性
部材３側のみに形成してある。そして、光信号２１は、
透過する場合は透光性部材３のみを透過し、スプリッタ
面２で反射した光信号だけが、結晶材料からなる複屈折
部材１を通過して、二つの偏光２１ａ、２１ｂに分離す
るようになっている。この場合は、結晶材料からなる複
屈折部材１中を光信号２１の透過光が通過しないため、
結晶材料の光軸の向きを定めておく必要がない。The polarization beam splitter 10 shown in FIG.
The translucent member 3 made of glass or the like and the birefringent member 1 made of a crystal material are both joined as a quadrangular prism. However, unlike the embodiment of FIG. It is formed in. Then, the optical signal 21 is
When transmitting, only the optical signal transmitted through the light transmitting member 3 and reflected by the splitter surface 2 passes through the birefringent member 1 made of a crystalline material and is separated into two polarized lights 21a and 21b. ing. In this case, since the transmitted light of the optical signal 21 does not pass through the birefringent member 1 made of a crystalline material,
It is not necessary to determine the direction of the optical axis of the crystal material.
【００２４】以上の本発明の偏光ビームスプリッタ１０
において、複屈折部材１を成す結晶材料としては、複屈
折特性を持ったものであれば良く、ほとんどの単結晶体
を使用できるが、特に、屈折率、透過率、コスト尚の点
から、水晶、サファイア、ルチル、方解石、ニオブ酸リ
チウム、タンタル酸リチウム、４ホウ酸リチウム（ＬＢ
Ｏ）、ＫＴＰ、ＡＤＰ等が好適である。これらの結晶材
料を製造する場合は、ＥＦＧ法等により、それぞれの溶
融原料中に種子結晶を浸漬して引き上げることによっ
て、所定の形状、結晶方位を有する単結晶体を得ること
ができる。The polarization beam splitter 10 of the present invention described above.
In the above, the crystal material forming the birefringent member 1 may be any material having birefringence characteristics, and most single crystal bodies can be used. In particular, from the viewpoints of refractive index, transmittance, and cost, quartz , Sapphire, rutile, calcite, lithium niobate, lithium tantalate, lithium tetraborate (LB
O), KTP, ADP and the like are suitable. In the case of producing these crystal materials, a single crystal having a predetermined shape and crystal orientation can be obtained by immersing and pulling up seed crystals in each molten raw material by EFG method or the like.
【００２５】また、透光性部材３としては、クラウンガ
ラス（ＢＫ７）又はフリントガラス等の硼珪酸ガラスや
その他のガラスを用いる。そして、スプリッタ面２は、
この透光性部材３の一部に、透過する光信号２１に対し
て所定の角度となるような斜面を形成することによって
得られる。As the translucent member 3, borosilicate glass such as crown glass (BK7) or flint glass or other glass is used. And the splitter surface 2
It is obtained by forming a slope at a predetermined angle with respect to the transmitted optical signal 21 in a part of the light transmitting member 3.
【００２６】さらに、複屈折部材１と透光性部材３との
接合には、透光性の熱硬化性接着剤又は紫外線硬化性接
着剤等の接着剤を用いることが好ましい。また、複屈折
部材１と透光性部材３を接合する場合は、両者の接合面
を表面粗さ（Ｒａ）０．００１μｍ以下の滑らかな面と
しておいて、上記接着剤を厚み０．５ｍｍ以下となるよ
うに介在させて接合する。Further, for bonding the birefringent member 1 and the light-transmitting member 3, it is preferable to use an adhesive such as a light-transmitting thermosetting adhesive or an ultraviolet-setting adhesive. When the birefringent member 1 and the translucent member 3 are joined, the joining surface of both is a smooth surface having a surface roughness (Ra) of 0.001 μm or less, and the adhesive is applied to a thickness of 0.5 mm or less. And joined so that
【００２７】そして、本発明においては、偏光ビームス
プリッタ１０を構成する複屈折部材１、透光性部材３、
接着剤のそれぞれの屈折率をほぼ一致させることが好ま
しく、このようにすれば、接合面を通過する光信号に対
して、光学干渉や表面反射を防ぐことができる。In the present invention, the birefringent member 1, the translucent member 3, and the
It is preferable that the refractive indices of the adhesives be substantially equal to each other, so that optical interference and surface reflection can be prevented with respect to an optical signal passing through the bonding surface.
【００２８】なお、複屈折部材１を成す結晶材料は二つ
の屈折率を有しているが、その差は小さいため、いずれ
かの屈折率とほぼ一致させれば良い。また、ほぼ一致さ
せるとは、三種類の屈折率の最大値と最小値の差が０．
０５以下であることを言う。Although the crystal material forming the birefringent member 1 has two refractive indices, the difference between them is small, so that the refractive index may be substantially equal to either one. In addition, “substantially match” means that the difference between the maximum value and the minimum value of the three types of refractive index is 0.
05 or less.
【００２９】また、本発明の偏光ビームスプリッタ１０
は、図２に示す光ディスクの読み取り装置に限らず、光
カードの信号分離、レーザーを使った光学センサ、光通
信の光信号の処理（アイソレータ、分波器、合波器）等
に好適に使用することができる。Further, the polarization beam splitter 10 of the present invention
Is suitably used not only for the optical disk reader shown in FIG. 2 but also for signal separation of optical cards, optical sensors using lasers, processing of optical signals for optical communication (isolators, demultiplexers, multiplexers), etc. can do.
【００３０】[0030]
【実施例】本発明の実施例として、図１に示す偏光ビー
ムスプリッタ１０を作製した。透光性部材３として屈折
率１．５５のクラウンガラスを用い、複屈折部材１とし
て屈折率１．５６の４ホウ酸リチウム結晶を用い、接着
剤として屈折率１．５５の紫外線硬化性接着剤を用いて
接合し、全体の寸法が３×３×３ｍｍの偏光ビームスプ
リッタ１０を得た。EXAMPLE As an example of the present invention, a polarizing beam splitter 10 shown in FIG. 1 was manufactured. A crown glass having a refractive index of 1.55 is used as the translucent member 3, a lithium tetraborate crystal having a refractive index of 1.56 is used as the birefringent member 1, and an ultraviolet curable adhesive having a refractive index of 1.55 is used as an adhesive. To obtain a polarizing beam splitter 10 having an overall size of 3 × 3 × 3 mm.
【００３１】なお、図４（ａ）に示す従来の構造で、こ
れと同じ機能をもつ素子を構成したところ、全体の寸法
が３×３×４ｍｍとなり、本発明の偏光ビームスプリッ
タ１０は小型化できることがわかる。When an element having the same function as that of the conventional structure shown in FIG. 4A is formed, the overall size becomes 3 × 3 × 4 mm, and the polarizing beam splitter 10 of the present invention is miniaturized. We can see that we can do it.
【００３２】また、本発明の偏光ビームスプリッタ１０
に対し、波長７８０ｎｍの光信号２１を入射し、スプリ
ッタ面２での反射光を二つの偏光２１ａ、２１ｂに分離
し、それぞれをフォトディテクタで検知したところ、偏
光分離機能が高く、良好に偏光２１ａ、２１ｂを検知で
きることがわかった。Further, the polarization beam splitter 10 of the present invention
In response, an optical signal 21 having a wavelength of 780 nm is incident, the reflected light on the splitter surface 2 is separated into two polarized lights 21a and 21b, and each is detected by a photodetector. 21b was found to be detectable.
【００３３】しかも、上記のように、複屈折部材１と透
光性部材３と接着剤の屈折率をほぼ一致させたため、偏
光ビームスプリッタ１０の上記接合面や他の光学部品と
の接合面に反射防止コートを施す必要なく、光学干渉や
表面反射を防止することができた。Further, as described above, since the refractive indices of the birefringent member 1, the translucent member 3 and the adhesive are made substantially the same, the bonding surface of the polarizing beam splitter 10 and the bonding surface with other optical components are formed. Optical interference and surface reflection could be prevented without the need for an antireflection coating.
【００３４】[0034]
【発明の効果】以上のように本発明によれば、光信号を
透過光と反射光に分離するスプリッタ面を有する透光性
部材と、上記反射光が通過する位置に配置した結晶材料
からなる複屈折部材とを、接合一体化して偏光ビームス
プリッタを構成したことによって、ビームスプリッタと
ウォラストンプリズムを一体化したため、部品点数を小
さくして全体を小型化し、低コスト化でき、また複屈折
部材を比較的大きく形成できるため、偏光分離機能を向
上できる。As described above, according to the present invention, a light-transmitting member having a splitter surface for separating an optical signal into transmitted light and reflected light, and a crystal material arranged at a position through which the reflected light passes. A birefringent member is joined and integrated to form a polarizing beam splitter, so that the beam splitter and the Wollaston prism are integrated, so the number of parts can be reduced and the whole can be reduced in size and cost can be reduced. Can be formed relatively large, so that the polarization separation function can be improved.
【００３５】さらに、本発明によれば、上記透光性部材
と複屈折部材とを透光性接着剤で接合するとともに、こ
れら透光性部材、複屈折部材、透光性接着剤の屈折率を
ほぼ一致させたことによって、表面反射や光学干渉を防
止することができる。Further, according to the present invention, the translucent member and the birefringent member are joined with a translucent adhesive, and the refractive indexes of the translucent member, the birefringent member, and the translucent adhesive are determined. Are substantially matched, surface reflection and optical interference can be prevented.
【００３６】したがって、小型、低コストで高性能の偏
光ビームスプリッタを構成することができる。Accordingly, a small-sized, low-cost, high-performance polarizing beam splitter can be constructed.
【図１】本発明の偏光ビームスプリッタを示す側面図で
ある。FIG. 1 is a side view showing a polarizing beam splitter of the present invention.
【図２】本発明の偏光ビームスプリッタを用いた光ディ
スクの読み出し装置を示す概略図である。FIG. 2 is a schematic view showing an optical disk reading device using the polarization beam splitter of the present invention.
【図３】本発明の偏光ビームスプリッタの他の実施形態
を示す側面図である。FIG. 3 is a side view showing another embodiment of the polarizing beam splitter of the present invention.
【図４】（ａ）（ｂ）は従来の偏光ビームスプリッタを
示す側面図である。FIGS. 4A and 4B are side views showing a conventional polarizing beam splitter.
【図５】従来の光ディスクの読み出し装置を示す概略図
である。FIG. 5 is a schematic diagram showing a conventional optical disk reading device.
１：複屈折部材 ２：スプリッタ面 ３：透光性部材 １０：偏光ビームスプリッタ １１：ビームスプリッタ １２：偏光分離素子 １３：ウォラストンプリズム １４：レーザーダイオード １５：フォトディテクタ １６：フォトディテクタ １７：光ディスク ２０：光信号 ２１：光信号 ２１ａ：偏光 ２１ｂ：偏光 1: Birefringent member 2: Splitter surface 3: Translucent member 10: Polarizing beam splitter 11: Beam splitter 12: Polarization splitting element 13: Wollaston prism 14: Laser diode 15: Photodetector 16: Photodetector 17: Optical disk 20: Light Signal 21: Optical signal 21a: Polarized 21b: Polarized
Claims (2)
リッタ面を有する透光性部材の、上記反射光が通過する
位置に、複屈折部材を接合一体化して成る偏光ビームス
プリッタ。A polarizing beam splitter comprising a light transmitting member having a splitter surface for separating a light beam into transmitted light and reflected light, and a birefringent member joined and integrated at a position where the reflected light passes.
の屈折率を持った材質で形成し、これらの間をほぼ同等
の屈折率を有する透光性接着剤で接合したことを特徴と
する請求項１記載の偏光ビームスプリッタ。2. The method according to claim 1, wherein the light-transmitting member and the birefringent member are formed of a material having substantially the same refractive index, and are joined with a light-transmitting adhesive having substantially the same refractive index. The polarizing beam splitter according to claim 1, wherein:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4679797A JPH10239520A (en) | 1997-02-28 | 1997-02-28 | Polarized beam splitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4679797A JPH10239520A (en) | 1997-02-28 | 1997-02-28 | Polarized beam splitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10239520A true JPH10239520A (en) | 1998-09-11 |
Family
ID=12757335
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4679797A Pending JPH10239520A (en) | 1997-02-28 | 1997-02-28 | Polarized beam splitter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10239520A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9154678B2 (en) | 2013-12-11 | 2015-10-06 | Apple Inc. | Cover glass arrangement for an electronic device |
| US9225056B2 (en) | 2014-02-12 | 2015-12-29 | Apple Inc. | Antenna on sapphire structure |
| US9221289B2 (en) | 2012-07-27 | 2015-12-29 | Apple Inc. | Sapphire window |
| US9232672B2 (en) | 2013-01-10 | 2016-01-05 | Apple Inc. | Ceramic insert control mechanism |
| US9632537B2 (en) | 2013-09-23 | 2017-04-25 | Apple Inc. | Electronic component embedded in ceramic material |
| US9678540B2 (en) | 2013-09-23 | 2017-06-13 | Apple Inc. | Electronic component embedded in ceramic material |
| US10052848B2 (en) | 2012-03-06 | 2018-08-21 | Apple Inc. | Sapphire laminates |
| US10406634B2 (en) | 2015-07-01 | 2019-09-10 | Apple Inc. | Enhancing strength in laser cutting of ceramic components |
-
1997
- 1997-02-28 JP JP4679797A patent/JPH10239520A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10052848B2 (en) | 2012-03-06 | 2018-08-21 | Apple Inc. | Sapphire laminates |
| US9221289B2 (en) | 2012-07-27 | 2015-12-29 | Apple Inc. | Sapphire window |
| US9232672B2 (en) | 2013-01-10 | 2016-01-05 | Apple Inc. | Ceramic insert control mechanism |
| US9632537B2 (en) | 2013-09-23 | 2017-04-25 | Apple Inc. | Electronic component embedded in ceramic material |
| US9678540B2 (en) | 2013-09-23 | 2017-06-13 | Apple Inc. | Electronic component embedded in ceramic material |
| US9154678B2 (en) | 2013-12-11 | 2015-10-06 | Apple Inc. | Cover glass arrangement for an electronic device |
| US10324496B2 (en) | 2013-12-11 | 2019-06-18 | Apple Inc. | Cover glass arrangement for an electronic device |
| US10386889B2 (en) | 2013-12-11 | 2019-08-20 | Apple Inc. | Cover glass for an electronic device |
| US9225056B2 (en) | 2014-02-12 | 2015-12-29 | Apple Inc. | Antenna on sapphire structure |
| US9461357B2 (en) | 2014-02-12 | 2016-10-04 | Apple Inc. | Antenna on sapphire structure |
| US9692113B2 (en) | 2014-02-12 | 2017-06-27 | Apple Inc. | Antenna on sapphire structure |
| US10406634B2 (en) | 2015-07-01 | 2019-09-10 | Apple Inc. | Enhancing strength in laser cutting of ceramic components |
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