JP5086864B2 - Optical member and optical head device - Google Patents

Optical member and optical head device Download PDF

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JP5086864B2
JP5086864B2 JP2008090319A JP2008090319A JP5086864B2 JP 5086864 B2 JP5086864 B2 JP 5086864B2 JP 2008090319 A JP2008090319 A JP 2008090319A JP 2008090319 A JP2008090319 A JP 2008090319A JP 5086864 B2 JP5086864 B2 JP 5086864B2
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太 石井
英之 山口
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Topcon Corp
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Description

本発明は、複数の反射層からなる積層膜を有する反射ミラー、プリズム、ビームスプリッタなどの光学部材及びそれを有する光ヘッド装置に関する。   The present invention relates to an optical member such as a reflecting mirror, a prism, and a beam splitter having a laminated film composed of a plurality of reflecting layers, and an optical head device having the same.

従来から、例えばCD(登録商標)、DVD(登録商標)、HDDVD(登録商標)、Blu−Ray(登録商標)用の光ディスク等の記録媒体が知られている。   Conventionally, recording media such as optical disks for CD (registered trademark), DVD (registered trademark), HDDVD (registered trademark), and Blu-Ray (registered trademark) are known.

このような記録媒体に音楽や映像などの情報を記録再生する場合、複数の反射層からなる積層膜を有する反射ミラー、プリズム、ビームスプリッタなどの光学部材を備える記録・再生用の光ヘッド装置を有する光ディスク記録再生装置が用いられている。   When recording and reproducing information such as music and video on such a recording medium, an optical head device for recording / reproduction comprising an optical member such as a reflecting mirror, a prism, and a beam splitter having a laminated film composed of a plurality of reflecting layers is provided. An optical disc recording / reproducing apparatus is used.

また、リアプロジェクション・フロントプロジェクション等の画像表示装置にも、画像用の光を射出する光学エンジンから射出される光を反射する反射ミラー、プリズム、ビームスプリッタなどの光学部品を有する。   An image display device such as a rear projection or a front projection also includes optical components such as a reflection mirror, a prism, and a beam splitter that reflect light emitted from an optical engine that emits image light.

更に、液晶露光装置や半導体露光装置等の荷電粒子ビーム装置においても、反射ミラー、ビームスプリッタなどの光学部材が用いられている。   Furthermore, in charged particle beam apparatuses such as liquid crystal exposure apparatuses and semiconductor exposure apparatuses, optical members such as reflection mirrors and beam splitters are used.

これらの光学部材として、例えば特許文献1に示されているように、偏光ビームスプリッタがあり、基板となる透明な平行平面板PTと、その一方の面に施された多層光学薄膜(又は保護膜で覆われた多層光学薄膜)から成る偏光分離膜PCと、他方の面に施された多層光学薄膜(又は保護膜で覆われた多層光学薄膜)から成る反射防止膜ACとで構成されている。偏光分離膜PCは、入射光束のS偏光成分をほとんど反射させ、かつ、P偏光成分をほとんど透過させる偏光分離特性を有するものであり、偏光分離膜PCに対するレーザビームL1〜L3の偏光方向はS偏光である。したがって、レーザビームL1〜L3は、空気との接触状態にある偏光分離膜PCで大部分が反射され、これにより各レーザ光源D1〜D3から光ディスクDKへの光路が形成される。3波長帯(波長405nm帯,波長650nm帯,波長780nm帯),膜面に対する入射角度60±4°{(A)56°,(B)60°,(C)64°}で用いる偏光分離膜PCの偏光分離特性は、次のような透過率(%;太線:S偏光の透過率,細線:P偏光の透過率)を示す。すなわち、偏光分離特性を有する偏光分離膜PCは、第2の実施の形態用として最適化したものであり、実使用波長である400nm〜415nm,60±4°の範囲において、P偏光の透過率Tp>92%,S偏光の反射率Rs>95%;650nm〜665nm,入射角度60±4°の範囲において、P偏光の透過率Tp>90%,S偏光の反射率Rs>95%;780nm〜795nm,入射角度60±3°の範囲において、P偏光の透過率Tp>90%,S偏光の反射率RS>95%と、良好な特性が得られている。   As these optical members, for example, as shown in Patent Document 1, there is a polarizing beam splitter, a transparent parallel flat plate PT serving as a substrate, and a multilayer optical thin film (or protective film) applied on one surface thereof. And a reflection preventing film AC made of a multilayer optical thin film (or a multilayer optical thin film covered with a protective film) applied on the other surface. . The polarization separation film PC has a polarization separation characteristic that reflects almost the S-polarized component of the incident light beam and transmits almost the P-polarized component, and the polarization direction of the laser beams L1 to L3 with respect to the polarization separation film PC is S. Polarized light. Accordingly, most of the laser beams L1 to L3 are reflected by the polarization separation film PC in contact with air, thereby forming an optical path from the laser light sources D1 to D3 to the optical disk DK. Polarization separation film used in three wavelength bands (wavelength 405 nm band, wavelength 650 nm band, wavelength 780 nm band), and incident angles 60 ± 4 ° {(A) 56 °, (B) 60 °, (C) 64 °} with respect to the film surface The polarization separation characteristics of PC show the following transmittances (%; thick line: S-polarized light transmittance, thin line: P-polarized light transmittance). That is, the polarization separation film PC having polarization separation characteristics is optimized for the second embodiment, and the transmittance of P-polarized light is within the range of 400 nm to 415 nm and 60 ± 4 ° which is the actual use wavelength. Tp> 92%, S-polarized light reflectance Rs> 95%; 650 nm to 665 nm, P-polarized light transmittance Tp> 90%, S-polarized light reflectance Rs> 95%; In the range of ˜795 nm and an incident angle of 60 ± 3 °, favorable characteristics are obtained, such that the transmittance of P-polarized light Tp> 90% and the reflectance of S-polarized light RS> 95%.

また、特許文献1の図8には、反射による位相の変化{(A)波長405nm,(B)波長650nm,(C)波長780nmでのS偏光の位相シフト}が示されている。この図8から分かるように、反射による位相シフトは各波長帯の使用角度範囲において概ね直線的になっている光学部材、もしくは、3波長帯(波長405nm帯,波長650nm帯,波長780nm帯),膜面に対する入射角度45±4°{(A)41°,(B)45°,(C)49°}で用いる偏光分離膜PCの偏光分離特性を反射率(%;Rs:S偏光の反射率,Rp:P偏光の反射率)で示している。   Further, FIG. 8 of Patent Document 1 shows a phase change {(A) wavelength 405 nm, (B) wavelength 650 nm, (C) phase shift of S-polarized light at wavelength 780 nm} due to reflection}. As can be seen from FIG. 8, the phase shift due to reflection is an optical member that is substantially linear in the use angle range of each wavelength band, or three wavelength bands (wavelength 405 nm band, wavelength 650 nm band, wavelength 780 nm band), The polarization separation property of the polarization separation film PC used at an incident angle of 45 ± 4 ° {(A) 41 °, (B) 45 °, (C) 49 °} with respect to the film surface is a reflectance (%; Rs: reflection of S-polarized light). Rate, Rp: reflectance of P-polarized light).

特許文献1の図10に、3波長帯(波長405nm帯,波長650nm帯,波長780nm帯),膜面に対する入射角度45±4°{(A)41°,(B)45°,(C)49°}で用いる偏光分離膜PCの偏光分離特性を透過率(%;太線:S偏光の透過率,細線:P偏光の透過率)で示す。この偏光分離特性を有する偏光分離膜PCは、偏光ビームスプリッタBSの配置を第2の実施の形態の状態から変えて最適化したものであり、実使用波長である400nm〜415nm,入射角度45±4°の範囲において、P偏光の透過率Tp>92%,S偏光の反射率Rs>95%;650nm〜665nm,入射角度45±4°の範囲において、P偏光の透過率Tp>90%,S偏光の反射率Rs>95%;780nm〜795nm,入射角度45±3°の範囲において、P偏光の透過率Tp>90%,S偏光の反射率RS>95%と、良好な特性が得られている。   In FIG. 10 of Patent Document 1, three wavelength bands (wavelength 405 nm band, wavelength 650 nm band, wavelength 780 nm band), incident angle 45 ± 4 ° {(A) 41 °, (B) 45 °, (C) with respect to the film surface. The polarization separation characteristics of the polarization separation film PC used at 49 °} are indicated by transmittance (%; thick line: S-polarized light transmittance, thin line: P-polarized light transmittance). The polarization separation film PC having this polarization separation characteristic is obtained by optimizing the arrangement of the polarization beam splitter BS from the state of the second embodiment, and has an actual use wavelength of 400 nm to 415 nm, an incident angle of 45 ±. P-polarized light transmittance Tp> 92% in the range of 4 °, S-polarized light transmittance Rs> 95%; P-polarized light transmittance Tp> 90% in the range of 650 nm to 665 nm and incident angle 45 ± 4 °, S-polarized light reflectivity Rs> 95%; P-polarized light transmittance Tp> 90% and S-polarized light reflectivity RS> 95% in the range of 780 nm to 795 nm and incident angle of 45 ± 3 °. It has been.

また、特許文献1の図11には、反射による位相の変化{(A)波長405nm,(B)波長650nm,(C)波長780nmでのS偏光の位相シフト}が示されている。図11から分かるように、反射による位相シフトは各波長帯の使用角度範囲において概ね直線的になっている光学部材が示されている。
特開2005−141872号公報
Further, FIG. 11 of Patent Document 1 shows the phase change {(A) wavelength 405 nm, (B) wavelength 650 nm, (C) phase shift of S-polarized light at wavelength 780 nm} due to reflection}. As can be seen from FIG. 11, an optical member is shown in which the phase shift due to reflection is substantially linear in the use angle range of each wavelength band.
JP 2005-141872 A

しかしながら、上述した特許文献1では、反射による位相シフトは各波長帯の使用角度範囲において概ね直線的になっているとはいえ、波長405nm、波長650nm、波長780nmの光を分光するための特性変化量が充分ではないため、分光に伴う光の損失が生じてしまう虞がある。   However, in Patent Document 1 described above, although the phase shift due to reflection is substantially linear in the use angle range of each wavelength band, the characteristic change for splitting light with a wavelength of 405 nm, a wavelength of 650 nm, and a wavelength of 780 nm. Since the amount is not sufficient, there is a risk of light loss due to spectroscopy.

そのため、p偏光やs偏光の光であっても高い反射率特性を維持し、HD DVD用、Blu−Ray Disc用の光ディスクの情報を再生記録するとき、高品質高画質の音声や画像などの情報を再生記録することができない。   Therefore, even when p-polarized light or s-polarized light is used, high reflectivity characteristics are maintained, and when reproducing and recording information on an optical disc for HD DVD or Blu-Ray Disc, high-quality, high-quality audio, images, etc. Information cannot be reproduced and recorded.

そこで、本発明は、近紫外域、可視域、赤外域におけるそれぞれの広帯域において分光特性変化量を0.5%/nm以下の変化量に抑え、特にP偏光の光において高い反射率特性あるいは透過率測定を維持し、Blue・DVD・CD波長を集中し、光路を変える機能と、モニターへ一部光を逃がす機能(3波長を同時に)を有し、CD用、HDDVD用、Blu−Ray Disc用の光ディスクの情報を再生記録するとき、高品質高画質の音声や画像などの情報の再生記録を可能にする反射ミラーを提供することを目的とする。   Therefore, the present invention suppresses the spectral characteristic change amount to a change amount of 0.5% / nm or less in each of the broadband in the near ultraviolet region, the visible region, and the infrared region, and particularly has high reflectance property or transmission in the P-polarized light. Maintains rate measurement, concentrates blue, DVD, and CD wavelengths, has a function to change the optical path, and a function to let some light escape to the monitor (3 wavelengths at the same time). For CD, HDDVD, Blu-Ray Disc An object of the present invention is to provide a reflection mirror that enables the reproduction and recording of information such as high-quality and high-quality sound and images when reproducing and recording information on an optical disc for use.

上述した目的を達成するため、この発明は、特許請求の範囲の各請求項に記載した事項を特徴とする。   In order to achieve the above-described object, the present invention is characterized by matters described in the claims.

以上により、本発明は、近紫外域、可視域、赤外域におけるそれぞれの広帯域において分光特性変化量を0.5%/nm以下の変化量に抑え、特にP偏光の光において高い反射率特性あるいは透過率測定を維持し、CD用、HDDVD用、Blu−Ray Disc用の光ディスクの情報を再生記録するとき、高品質高画質の音声や画像などの情報の再生記録を可能にする反射ミラーを提供することができる。   As described above, the present invention suppresses the spectral characteristic change amount to a change amount of 0.5% / nm or less in each of the broadband in the near ultraviolet region, the visible region, and the infrared region. Provides a reflection mirror that maintains the transmittance measurement and enables playback and recording of high-quality, high-quality audio and image information when reproducing and recording information on optical discs for CDs, HDDVDs, and Blu-Ray discs. can do.

また、波長405nm、波長650nm、波長780nmそれぞれの光源の温度ドリフトに対応して、各波長範囲で透過率の変化がほとんどない光学部材を提供することができる。   Further, it is possible to provide an optical member having almost no change in transmittance in each wavelength range corresponding to the temperature drift of the light sources having wavelengths of 405 nm, 650 nm, and 780 nm.

また、P偏光の一部の光を透過もしくは反射させることができ、3波長用の反射ミラーにも適用することができる。   Further, a part of the P-polarized light can be transmitted or reflected, and can also be applied to a reflection mirror for three wavelengths.

また、部品点数を削減することができる。   In addition, the number of parts can be reduced.

発明の実施の形態BEST MODE FOR CARRYING OUT THE INVENTION

図面に基づいて本発明の実施例を説明する。   Embodiments of the present invention will be described with reference to the drawings.

図1は、本発明に係る光ヘッドを示す。   FIG. 1 shows an optical head according to the present invention.

TMR(三波長用反射ミラー)1は、断面が台形状の透明基板と、透明基板の下底(一方の面)にコーティングして成膜した光学多層膜を有している。この光学多層膜のコーティング方法は、真空蒸着・イオンアシスト・イオンプレーティング・スパッタリング等の物理蒸着法でも良いし、コート液に浸漬させコートする浸漬法、スピン法などであってもよい。   The TMR (three-wavelength reflection mirror) 1 includes a transparent substrate having a trapezoidal cross section and an optical multilayer film formed by coating the lower base (one surface) of the transparent substrate. The coating method of the optical multilayer film may be a physical vapor deposition method such as vacuum vapor deposition, ion assist, ion plating, or sputtering, or may be an immersion method in which coating is performed by dipping in a coating solution, a spin method, or the like.

基板は、断面が台形形状の基板に限定されず、断面が矩形形状のものであってもよい。   The substrate is not limited to a substrate having a trapezoidal cross section, and may have a rectangular cross section.

また、成膜する光学多層膜は、好ましくは、透明基板(基材)上に、低屈折率材料であるSiO2と高屈折率材料であるNb2O5、Ta2O5、TiO2、HfO2、ZrO2等の一つ以上の材料による交互層で30層からなる。この積層構造によって、所定の分光特性を有する。   Further, the optical multilayer film to be formed is preferably one or more of SiO2 as a low refractive index material and Nb2O5, Ta2O5, TiO2, HfO2, ZrO2 and the like as a high refractive index material on a transparent substrate (base material). It consists of 30 layers of alternating layers of the above materials. This laminated structure has predetermined spectral characteristics.

また、透明基板(基材)は、透明なガラス基板のような光学基材であればよい。更に、例えば液晶露光装置や半導体露光装置等の荷電粒子ビーム装置などに反射ミラーとして用いる場合には、透明基板(基材)に石英、蛍石(CaF)などの光学基材を用いてもよい。 The transparent substrate (base material) may be an optical base material such as a transparent glass substrate. Further, for example, when used as a reflection mirror in a charged particle beam apparatus such as a liquid crystal exposure apparatus or a semiconductor exposure apparatus, an optical base material such as quartz or fluorite (CaF 2 ) may be used as the transparent substrate (base material). Good.

また、プリズムなどの底面(貼り合わせ面)に上記多層膜を積層し、2つ以上のプリズムを組み合わせ、ビームスプリッタなどの光学部材に適用してもよい。   Further, the multilayer film may be laminated on the bottom surface (bonding surface) of a prism or the like, and two or more prisms may be combined and applied to an optical member such as a beam splitter.

ここで、Blu−Ray用、HDDVD用光ディスクに用いられる波長は、好ましくは、405nmを含む380nm〜440nmの波長域であり、DVD用に用いられる波長は、波長630nm〜690nmであり、CD用に用いられる波長は、750nm〜830nmの波長域である。   Here, the wavelength used for the optical disc for Blu-Ray and HDDVD is preferably in the wavelength range of 380 nm to 440 nm including 405 nm, and the wavelength used for DVD is 630 nm to 690 nm, and is used for CD. The wavelength used is a wavelength region of 750 nm to 830 nm.

CD、DVD、Blu−Ray用のそれぞれの光源から発光されたレーザ光は、それぞれ下記のように、CD、DVD、Blu−Rayディスクなどの記録媒体に導光され、音楽、映像などの情報を記録再生する。   Laser light emitted from each light source for CD, DVD, and Blu-Ray is guided to a recording medium such as a CD, DVD, and Blu-Ray disc as follows, and information such as music and video is transmitted. Record and play back.

すなわち、それぞれのレーザ光は、レーザ光源から記録媒体に向かう往路、復路で下記のような光路をとる。   That is, each laser beam takes the following optical path in the forward path and the return path from the laser light source to the recording medium.

<往路>
Blu−Ray用の場合、図1に例示するように、順に、LD(ブルー用半導体レーザ)2、Prism(プリズム)3、PBS(偏光ビームスプリッタ)4、TMR(三波長用ミラー)1、CL(集光レンズ)5、RMR(反射ミラー)6を通過し、Blu−Ray用レーザ光は、FMPD(レーザ光量測定器)9で光量が充分かどうか測定検査される。
<Outward trip>
In the case of Blu-Ray, as illustrated in FIG. 1, LD (blue semiconductor laser) 2, Prism (prism) 3, PBS (polarizing beam splitter) 4, TMR (three-wavelength mirror) 1, CL in order (Condenser lens) 5 and RMR (reflection mirror) 6 are passed through, and the Blu-Ray laser light is measured and inspected by an FMPD (laser light amount measuring device) 9 to determine whether the light amount is sufficient.

DVD用の場合、順に、LD(半導体レーザ)7、Prism(プリズム)3、PBS(偏光ビームスプリッタ)4、TMR(三波長用ミラー)1、CL(集光レンズ)5、RMR(反射ミラー)6を通過し、DVD用レーザ光は、FMPD(レーザ光量測定器)9で光量が充分なのか測定検査される。   In the case of DVD, in order, LD (semiconductor laser) 7, Prism (prism) 3, PBS (polarization beam splitter) 4, TMR (three-wavelength mirror) 1, CL (condensing lens) 5, RMR (reflection mirror) 6, the DVD laser light is measured and inspected by an FMPD (laser light amount measuring device) 9 to determine whether the light amount is sufficient.

CD用の場合、順に、LD(半導体レーザ)8、TMR(三波長用ミラー)1、CL(集光レンズ)5、RMR(反射ミラー)6を通過し、FMPD(レーザ光量測定器)9で光量が充分なのか測定検査される。   In the case of a CD, the laser beam passes through an LD (semiconductor laser) 8, a TMR (three-wavelength mirror) 1, a CL (condensing lens) 5, and an RMR (reflection mirror) 6, and an FMPD (laser light amount measuring device) 9. It is measured and inspected for sufficient light.

<復路>
Blu−Ray用の場合、順に、RMR(反射ミラー)6、CL(集光レンズ)5、TMR(三波長用ミラー)1、PBS(偏光ビームスプリッタ)4を通過し、PD(光量測定器)10で測定検査される。
<Return trip>
In the case of Blu-Ray, the light passes through RMR (reflecting mirror) 6, CL (condensing lens) 5, TMR (three-wavelength mirror) 1, PBS (polarizing beam splitter) 4, and PD (light quantity measuring device) in this order. 10 is measured and inspected.

DVD用の場合、順に、RMR(反射ミラー)6、CL(集光レンズ)5、TMR(三波長用ミラー)1、PBS(偏光ビームスプリッタ)4を通過し、PD(光量測定器)10で光量が充分なのか測定検査される。   In the case of a DVD, the light passes through an RMR (reflecting mirror) 6, a CL (condensing lens) 5, a TMR (three-wavelength mirror) 1, and a PBS (polarizing beam splitter) 4, and a PD (light quantity measuring device) 10. It is measured and inspected for sufficient light.

CD用の場合、順に、RMR(反射ミラー)6、CL(集光レンズ)5、TMR(三波長用ミラー)1を通過し、PD(光量測定器)10で光量が充分なのか測定検査される。   In the case of a CD, the light passes through an RMR (reflecting mirror) 6, CL (condensing lens) 5, and TMR (three-wavelength mirror) 1 in order, and a PD (light quantity measuring device) 10 measures and inspects whether the light quantity is sufficient. The

往路および復路のいずれにおいても、三波長用ミラー(TMR)1を透過あるいは反射する。   It transmits or reflects through the three-wavelength mirror (TMR) 1 in both the forward path and the return path.

三波長用反射ミラー(TMR)1に積層した膜の構成は、好ましくは、表1に示すとおりである。SiO−Nbの交互層(30層)の光学薄膜である。

Figure 0005086864
The structure of the film laminated on the three-wavelength reflection mirror (TMR) 1 is preferably as shown in Table 1. It is an optical thin film of alternating layers (30 layers) of SiO 2 —Nb 2 O 3 .
Figure 0005086864

また、SiO−Nbの交互層の光学薄膜以外にも、Ta−SiOの交互層の光学薄膜であってもよい。三波長用反射ミラー(TMR)1にTa−SiOの交互層を積層した膜の構成は、好ましくは、表2に示すとおりである。Ta−SiOの交互層(38層)の光学薄膜である。

Figure 0005086864
In addition to the optical thin film of alternating layers of SiO 2 —Nb 2 O 3 , an optical thin film of alternating layers of Ta 2 O 5 —SiO 2 may be used. The structure of the film in which alternating layers of Ta 2 O 5 —SiO 2 are laminated on the three-wavelength reflection mirror (TMR) 1 is preferably as shown in Table 2. It is an optical thin film of alternating layers (38 layers) of Ta 2 O 5 —SiO 2 .
Figure 0005086864

本発明に係る好ましい光学部材は、所定の波長の多くとも10%以下の光を透過させ、所定の波長帯域の分光特性変化量が0.5%/nm以下の変化量である光学薄膜を有することを特徴としている。   A preferred optical member according to the present invention has an optical thin film that transmits at most 10% or less of a predetermined wavelength and has a spectral characteristic change amount of a predetermined wavelength band of 0.5% / nm or less. It is characterized by that.

あるいは、本発明に係る好ましい光学部材は、所定の波長の少なくとも90%以上の光を透過させるための波長帯域の分光特性変化量が0.5%/nm以下の変化量である成膜を有することを特徴としている。   Alternatively, a preferable optical member according to the present invention has a film formation in which a spectral characteristic variation in a wavelength band for transmitting light of at least 90% or more of a predetermined wavelength is a variation of 0.5% / nm or less. It is characterized by that.

あるいは、好ましくは、おおよそ380nm〜440nmの波長帯域、630nm〜690nmの波長帯域、750nm〜830nmの波長帯域の各波長帯域の1つ以上の波長帯域の波長の多くとも10%以下の光を透過させるための波長帯域の分光特性変化量が0.5%/nm以下の変化量であり、上記各波長帯域の1つ以上の波長帯域の波長の少なくとも90%以上の光を透過させるための波長帯域の分光特性変化量が0.5%/nm以下の変化量である光学薄膜を有する。   Alternatively, preferably, at most 10% or less of light in one or more of the wavelength bands of approximately 380 nm to 440 nm, 630 nm to 690 nm, and 750 nm to 830 nm is transmitted. A wavelength band for transmitting light having a wavelength characteristic change amount of 0.5% / nm or less for transmitting light of at least 90% of one or more wavelength bands of each wavelength band The optical thin film has a spectral characteristic change amount of 0.5% / nm or less.

また、好ましくは、おおよそ380nm〜440nmの波長帯域、630nm〜690nmの波長帯域、750nm〜830nmの波長帯域の各波長帯域の1つ以上の波長帯域の波長の多くとも5%の光を透過させるための波長帯域の分光平坦度が0.5%以下の変化量であり、上記各波長帯域の1つ以上の波長帯域の波長の少なくとも95%の光を透過させるための波長帯域の分光平坦度が0.5%以下の変化量である光学薄膜を有する。   Preferably, at most 5% of light in one or more of the wavelength bands of approximately 380 nm to 440 nm, 630 nm to 690 nm, and 750 nm to 830 nm is transmitted. The spectral flatness of the wavelength band is a change amount of 0.5% or less, and the spectral flatness of the wavelength band for transmitting light of at least 95% of the wavelength of one or more wavelength bands of each wavelength band is An optical thin film having a change amount of 0.5% or less is included.

また、好ましくは、おおよそ380nm〜440nmの波長帯域においてブルーレイディスクに用いられる波長の光の一部を透過させ、残りの光を反射させ、おおよそ630nm〜690nmの波長帯域においてDVDに用いられる波長の光の一部を透過させ、残りの光を反射させ、おおよそ750nm〜830nmの波長帯域においてCDに用いられる波長の光の一部を透過させ、残りの光を反射させるための波長帯域の分光特性変化量が0.5%/nm以下の変化量である光学薄膜を有する。   Preferably, a part of light having a wavelength used for a Blu-ray disc is transmitted in a wavelength band of approximately 380 nm to 440 nm, a remaining light is reflected, and a light having a wavelength used for a DVD in a wavelength band of approximately 630 nm to 690 nm. Of the wavelength band for transmitting a part of the light, reflecting the remaining light, transmitting a part of the light of the wavelength used for the CD in the wavelength band of approximately 750 nm to 830 nm, and reflecting the remaining light It has an optical thin film whose amount is a change amount of 0.5% / nm or less.

また、好ましくは、おおよそ380nm〜440nmの波長帯域においてブルーレイディスクに用いられる波長の光の多くとも10%以下の光を透過させるための波長帯域の分光特性変化量が0.5%/nm以下の変化量であり、
また、好ましくは、おおよそ630nm〜690nmの波長帯域においてDVDに用いられる波長の光の少なくとも10%以下の光を透過させるための波長帯域の分光特性変化量が0.5%/nm以下の変化量であり、おおよそ750nm〜830nmの波長帯域においてCDに用いられる波長の少なくとも90%以上の光を透過させるための波長帯域の分光特性変化量が0.5%/nm以下の変化量である光学薄膜を有する。
Preferably, the spectral characteristic change amount in the wavelength band for transmitting at most 10% of the light of the wavelength used for the Blu-ray disc in the wavelength band of approximately 380 nm to 440 nm is 0.5% / nm or less. The amount of change,
Preferably, the amount of change in the spectral characteristics of the wavelength band for transmitting at least 10% or less of the light having the wavelength used for the DVD in the wavelength band of approximately 630 nm to 690 nm is 0.5% / nm or less. An optical thin film whose spectral characteristic change amount in a wavelength band for transmitting light of at least 90% or more of a wavelength used for CD in a wavelength range of approximately 750 nm to 830 nm is a change amount of 0.5% / nm or less Have

また、上述した反射ミラー、プリズム、ビームスプリッタなどの光学部材を、CD用、DVD用、あるいはBlu−RayDisc用の録音録画再生のレコーダなどの光ヘッド装置に設け、それぞれの波長帯域で透過した光を検知するモニタ光学部材を有し、それぞれの波長帯域で反射した光によりブルーレイディスクまたはDVDまたはCDに投影し、録音録画再生を行うようにしてもよい。   Further, the above-described optical members such as the reflecting mirror, prism, and beam splitter are provided in an optical head device such as a recording / reproducing recorder for CD, DVD, or Blu-Ray Disc, and transmitted through each wavelength band. May be recorded on a Blu-ray disc, DVD, or CD by light reflected in each wavelength band, and recording, recording, and reproduction may be performed.

図2〜4は、P偏光の透過率と波長との関係(Tp)と、S偏光の透過率と波長との関係(Ts)を示す。   2 to 4 show the relationship between the transmittance of P-polarized light and the wavelength (Tp) and the relationship between the transmittance of S-polarized light and the wavelength (Ts).

本発明の前述の実施例では、図2に示すように、所定波長のP偏光の一部の光を透過もしくは反射する光学部材に適用しているが、本発明は、これに限定されず、S偏光の一部の光を透過もしくは反射する光学部材に用いても良い。なお、Blu−RayDisc用の波長は、レーザーパワーが大きいため、図3〜4に示すように、Ta−SiOの光学薄膜を積層した光学部材を用いても良い。 In the above-described embodiment of the present invention, as shown in FIG. 2, the present invention is applied to an optical member that transmits or reflects a part of P-polarized light having a predetermined wavelength, but the present invention is not limited to this. You may use for the optical member which permeate | transmits or reflects a part of light of S polarized light. Since the wavelength for Blu-Ray Disc has a large laser power, an optical member in which an optical thin film of Ta 2 O 5 —SiO 2 is laminated may be used as shown in FIGS.

以上の構成により、以下のような効果が得られる。   With the above configuration, the following effects can be obtained.

380nm〜440nm、630nm〜690nm、750nm〜830nmの波長域のレーザ光に対して、光量測定器FMPDを一つ設置するだけでよく、部品点数が少なくなる。   It is only necessary to install one light quantity measuring device FMPD for the laser light in the wavelength regions of 380 nm to 440 nm, 630 nm to 690 nm, and 750 nm to 830 nm, and the number of parts is reduced.

また、三波長用反射ミラーなどの光学部材に積層する膜は、蒸着膜でも良く、貼り合わせが無く部品信頼性が向上する。   Further, the film laminated on the optical member such as the three-wavelength reflection mirror may be a vapor-deposited film, and there is no bonding and the component reliability is improved.

また、波面収差管理が容易になる。今まで、CD用にミラーを三波長用反射ミラーに貼付していたが、上記三波長用反射ミラーなどの光学部材により、裏にミラーを貼る必要がなくなり、製造工程がすくなくなる。分光平坦性が良好であり,LD温度特性に対して広帯域となり、温度特性、経時的変化などによりレーザ光の波長域が安定しなくなった場合においても対応することができ、製品の信頼性がさらに向上する。   In addition, wavefront aberration management becomes easy. Until now, mirrors for CDs have been affixed to three-wavelength reflecting mirrors, but optical members such as the above-mentioned three-wavelength reflecting mirrors eliminate the need to affix a mirror on the back, making the manufacturing process short. Spectral flatness is good, it has a wide band with respect to LD temperature characteristics, and even when the wavelength range of laser light becomes unstable due to temperature characteristics, changes over time, etc., it can cope with further reliability of the product improves.

本発明は、近紫外域、可視域、赤外域におけるそれぞれの広帯域において分光特性変化量を0.5%/nm以下の変化量に抑え、特にP偏光の光において高い反射率特性あるいは透過率測定を維持し、CD用、HDDVD用、Blu−Ray Disc用の光ディスクの情報を再生記録するとき、高品質高画質の音声や画像などの情報の再生記録を可能にする反射ミラーを提供することができる。   The present invention suppresses the spectral characteristic change amount to a change amount of 0.5% / nm or less in each of the broadband in the near ultraviolet region, the visible region, and the infrared region, and particularly has high reflectance property or transmittance measurement in the P-polarized light. To provide a reflection mirror that enables reproduction and recording of information such as high-quality, high-quality sound and images when reproducing and recording information on an optical disk for CD, HDDVD, and Blu-Ray Disc. it can.

また、波長405nm、波長650nm、波長780nmそれぞれの光源の温度ドリフトに対応して、各波長範囲で透過率の変化がほとんどない光学部材を提供することができる。また、P偏光の一部の光を透過もしくは反射させることができ、3波長用の反射ミラーにも適用することができる。また、部品点数を削減することができる。   Further, it is possible to provide an optical member having almost no change in transmittance in each wavelength range corresponding to the temperature drift of the light sources having wavelengths of 405 nm, 650 nm, and 780 nm. Further, a part of the P-polarized light can be transmitted or reflected, and can also be applied to a reflection mirror for three wavelengths. In addition, the number of parts can be reduced.

本発明の好ましい実施例による光ヘッドの概略を示す。1 schematically shows an optical head according to a preferred embodiment of the present invention. P偏光の透過率と波長との関係(Tp)と、S偏光の透過率と波長との関係(Ts)を示す。The relationship (Tp) between the transmittance and wavelength of P-polarized light and the relationship (Ts) between the transmittance and wavelength of S-polarized light are shown. P偏光の透過率と波長との関係(Tp)と、S偏光の透過率と波長との関係(Ts)を示す。The relationship (Tp) between the transmittance and wavelength of P-polarized light and the relationship (Ts) between the transmittance and wavelength of S-polarized light are shown. P偏光の透過率と波長との関係(Tp)と、S偏光の透過率と波長との関係(Ts)を示す。The relationship (Tp) between the transmittance and wavelength of P-polarized light and the relationship (Ts) between the transmittance and wavelength of S-polarized light are shown.

符号の説明Explanation of symbols

1 三波長用ミラー(TMR)
4 偏光ビームスプリッタ(PBS)
5 集光レンズ(CL)
6 反射ミラー(RMR)
10 光量測定器(PD)
1 Three-wavelength mirror (TMR)
4 Polarizing beam splitter (PBS)
5 Condenser lens (CL)
6 Reflection mirror (RMR)
10 Light meter (PD)

Claims (1)

おおよそ380nm〜440nmの波長帯域においてブルーレイディスクに用いられる波長の光の多くとも10%以下の光を透過させるための波長帯域の分光特性変化量が0.5%/nm以下の変化量であり、
おおよそ630nm〜690nmの波長帯域においてDVDに用いられる波長の光の多くとも10%以下の光を透過させるための波長帯域の分光特性変化量が0.5%/nm以下の変化量であり、
おおよそ750nm〜830nmの波長帯域においてCDに用いられる波長の90%以上95%以下の光を透過させるための波長帯域の分光特性変化量が0.5%/nm以下の変化量である光学薄膜を有することを特徴とする光学部材。
In the wavelength band of approximately 380 nm to 440 nm, the spectral characteristic change amount in the wavelength band for transmitting at most 10% of the light of the wavelength used for the Blu-ray disc is a change amount of 0.5% / nm or less,
In the wavelength band of about 630 nm to 690 nm, the spectral characteristic change amount of the wavelength band for transmitting at most 10% of the light of the wavelength used for DVD is a change amount of 0.5% / nm or less,
An optical thin film having a change amount of a spectral characteristic in a wavelength band for transmitting light of 90% to 95% of a wavelength used for a CD in a wavelength range of approximately 750 nm to 830 nm is 0.5% / nm or less. An optical member comprising:
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