JP5118606B2 - Optical element - Google Patents
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- JP5118606B2 JP5118606B2 JP2008281297A JP2008281297A JP5118606B2 JP 5118606 B2 JP5118606 B2 JP 5118606B2 JP 2008281297 A JP2008281297 A JP 2008281297A JP 2008281297 A JP2008281297 A JP 2008281297A JP 5118606 B2 JP5118606 B2 JP 5118606B2
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Description
本発明は、ＤＶＤ（登録商標）、ブルーレイディスク（登録商標）の記録（録音、録画）や再生のための装置に用いられる光学素子に関し、とくに素子表面が酸素と反応しないように酸化遮断性膜を積層した光学素子に関する。 The present invention relates to an optical element used in an apparatus for recording (recording, recording) and reproducing DVD (registered trademark) and Blu-ray Disc (registered trademark), and in particular, an oxidation blocking film so that the element surface does not react with oxygen. It is related with the optical element which laminated | stacked.
従来から、例えば特許文献１などに示すように、波長板、偏光板、プリズム、反射ミラー、対物レンズなどの光学素子を製造する過程において、酸化防止剤を添加したことで、酸化防止した光学素子を製造することが知られている。
しかしながら、例えばブルーレイディスクで録音、録画などの記録に用いられる特定の短波長の光、例えば３９０ｎｍ〜４２０ｎｍなどの光に対し、波長板、偏光板、プリズム、反射ミラー、対物レンズなどの光学素子は、光の照射を受けるにつれて白濁・劣化してしまい、録音、録画などの記録に用いることができなくなってしまう。 However, optical elements such as a wave plate, a polarizing plate, a prism, a reflecting mirror, and an objective lens are used for a specific short wavelength light used for recording such as recording and recording on a Blu-ray disc, for example, light of 390 nm to 420 nm, for example. As it is irradiated with light, it becomes cloudy or deteriorates and cannot be used for recording such as recording.
一方、特許文献１では、素子内部に酸化防止剤を添加しているものの、素子表面では、酸化防止剤の化合物が稠密して配置されていないので、例えば３９０ｎｍ〜４２０ｎｍなどの短波長の光の長時間の照射により、やはり劣化してしまう懸念がある。 On the other hand, in Patent Document 1, although an antioxidant is added to the inside of the element, since the antioxidant compound is not densely arranged on the surface of the element, for example, light having a short wavelength such as 390 nm to 420 nm can be obtained. There is also a concern that it will deteriorate due to long-time irradiation.
本発明の目的は、前述のような特定の短波長の光の長時間の照射を受けても、白濁・劣化が生じにくい光学素子を提供することである。 An object of the present invention is to provide an optical element that hardly causes white turbidity and deterioration even when irradiated with light of a specific short wavelength as described above for a long time.
前述の課題を解決するための本発明の解決手段を例示すると、特許請求の範囲の各請求項に記載の光学素子である。 Examples of the solution means of the present invention for solving the above-described problems are optical elements described in the claims.
本発明者等は、上記のような特定の短波長の光の照射による、光学素子の白濁・劣化は、光の照射によって素子が空気中の酸素分子と反応し、化学変化を起こすことによって引き起こされるという知見を得た。さらに、光学素子の表面が酸素と接触することを防止することで、光学素子の白濁・劣化を大幅に改善できることを見出した。 The present inventors have found that the white turbidity / deterioration of an optical element due to irradiation with light of a specific short wavelength as described above is caused by a chemical change caused by the element reacting with oxygen molecules in the air by light irradiation. I got the knowledge that. Furthermore, it has been found that by preventing the optical element surface from coming into contact with oxygen, the white turbidity and deterioration of the optical element can be significantly improved.
そこで、本発明の１つの実施形態では、ＤＶＤ、ブルーレイディスク等に記録、再生するための装置に用いられる光学素子を改良して、酸素遮断性を持つ膜を素子の最外層に積層する。とくに、酸素遮断性を持つ膜を、素子の表面、または／および裏面、または／および側面に積層（あるいは、塗布）する。 Therefore, in one embodiment of the present invention, an optical element used in an apparatus for recording and reproducing on a DVD, a Blu-ray disc or the like is improved, and a film having an oxygen barrier property is laminated on the outermost layer of the element. In particular, a film having oxygen barrier properties is laminated (or coated) on the front surface, / and back surface, and / or side surface of the element.
本発明の別の実施形態では、ブルーレイディスク装置に用いられる光学素子において、酸素を遮断する性質を持つ膜を素子の最外層に積層し、例えば３９０ｎｍ〜４２０ｎｍなどの短波長のブルーレイのレーザ光においても、白濁・劣化することなく、再生や、録音、録画などの記録のために用いることができる波長板、偏光板、プリズム、反射ミラー、対物レンズなどの光学素子を提供する。 In another embodiment of the present invention, in an optical element used in a Blu-ray disc apparatus, a film having a property of blocking oxygen is laminated on the outermost layer of the element, for example, in a Blu-ray laser beam having a short wavelength such as 390 nm to 420 nm. The present invention also provides optical elements such as a wave plate, a polarizing plate, a prism, a reflecting mirror, and an objective lens that can be used for recording such as reproduction, recording, and video recording without causing clouding or deterioration.
本発明の更に別の実施形態においては、酸素を遮断する性質をもつ膜を、ブルーレイディスク装置に用いられる光学素子の表面、裏面、側面の少なくとも１つの面（好ましくは全ての面）に積層（あるいは、塗布）する。そうすることにより、例えば３９０ｎｍ〜４２０ｎｍなどの短波長のブルーレイのレーザ光においても光学素子が、白濁・劣化することなく、再生、録音、録画などの記録のために用いることができる。 In still another embodiment of the present invention, a film having the property of blocking oxygen is laminated on at least one surface (preferably all surfaces) of the front surface, the back surface, and the side surface of the optical element used in the Blu-ray disc device ( Or apply). By doing so, the optical element can be used for recording such as reproduction, recording, video recording, and the like, without white turbidity / deterioration even in a short wavelength Blu-ray laser beam such as 390 nm to 420 nm.
酸素を遮断する性質をもつ膜の好適な例を説明すると、最適な例は、例えば真空蒸着によりＳｉＯ２などの金属酸化物（酸素バリア層）を積層することによって形成された膜、または、湿式（溶液コート）でＳｉＯ２＋フッ素コート（酸素バリア層）することによって形成された膜である。なお、ＳｉＯ２に限定されず、ＳｉＯＮ、Ｓｉ＋ＤＬＣ、チッ化珪素（ＳｉＦ４）などの金属酸化物を積層してもよい。 A preferred example of a film having a property of blocking oxygen will be described. An optimum example is a film formed by laminating a metal oxide (oxygen barrier layer) such as SiO 2 by vacuum deposition, or a wet type. This is a film formed by applying SiO 2 + fluorine coating (oxygen barrier layer) with (solution coating). The present invention is not limited to SiO 2, SiON, Si + DLC , may be laminated metal oxides such as nitride silicon (SiF 4).
積層方法は、真空蒸着、溶液コート法（浸漬法）以外にも、スパッタリング法、スピンコート法などの方法を用いてもよい。 As a lamination method, a sputtering method, a spin coating method, or the like may be used in addition to the vacuum deposition and the solution coating method (dipping method).
本発明による光学素子は、好ましくは、波長板、偏光板、プリズム、反射ミラー、対物レンズである。 The optical element according to the present invention is preferably a wave plate, a polarizing plate, a prism, a reflecting mirror, or an objective lens.
本発明を適用した光学素子について実施例をもとに説明する。 An optical element to which the present invention is applied will be described based on examples.
例えば、波長板の、ブルーレイのレーザ光が透過する領域（おおよそ有効径３ｍｍ程度）を含む表面及び裏面の全体に蒸着によりＳｉＯ２などの金属酸化物（酸素バリア層）を積層する。合わせて、例えば、波長板の側面の全体にも蒸着によりＳｉＯ２などの金属酸化物（酸素バリア層）を積層してもよい。 For example, a metal oxide (oxygen barrier layer) such as SiO 2 is laminated on the entire surface and back surface of the wave plate including the region (approximately an effective diameter of about 3 mm) through which the Blu-ray laser light is transmitted. In addition, for example, a metal oxide (oxygen barrier layer) such as SiO 2 may be laminated on the entire side surface of the wave plate by vapor deposition.
または、波長板の、ブルーレイのレーザ光が透過する範囲に湿式（溶液コート）でＳｉＯ２＋フッ素のコート（酸素バリア層）を形成する。分析の結果、これらの処理により素子表面の酸素透過率は、未処理のものと比較して、０．４％程度まで減少できることが確認された。 Alternatively, a SiO 2 + fluorine coat (oxygen barrier layer) is formed by wet (solution coating) in a range where the blue ray laser beam is transmitted through the wave plate. As a result of analysis, it was confirmed that the oxygen transmission rate on the surface of the element can be reduced to about 0.4% by these treatments as compared with the untreated ones.
なお、ＳｉＯ２に限定されず、ＳｉＯＮ、Ｓｉ＋ＤＬＣ（ダイヤモンドライクカーボン）、チッ化珪素（ＳｉＦ４）などの金属酸化物を積層しても、同様の効果を得ることができる。 The present invention is not limited to SiO 2, SiON, Si + DLC ( diamond-like carbon), be laminated metal oxides such as nitride silicon (SiF 4), it is possible to obtain the same effect.
溶液コート法を用いる場合、コート膜種として、フッ素樹脂、塩ビ、塩化ビニリデン樹脂、フッ化ビニリデン樹脂、アクリル樹脂、ポリエステル樹脂、ウレタン樹脂、エポキシ樹脂などを用いることもできる。 When the solution coating method is used, as the coating film type, fluorine resin, vinyl chloride, vinylidene chloride resin, vinylidene fluoride resin, acrylic resin, polyester resin, urethane resin, epoxy resin, or the like can be used.
波長板などの光学素子は、有機化合物である、シクロオレフィン系ポリマーの、ＡＲＴＯＮ（登録商標、アートンＪＳＲ製）、ＺＥＯＮＯＲ（登録商標、ゼオノア、日本ゼオン製）、環状オレフィンコポリマー（ＣＯＣ）であるアペル（登録商標、三井化学製）などを用いることができ、また、その他のシクロオレフィン系ポリマーやポリカーボネイト、ポリビニルアルコール、また三酢酸セルロースなども用いることができる。 Optical elements such as wave plates are organic compounds, cycloolefin-based polymers such as ARTON (registered trademark, manufactured by Arton JSR), ZEONOR (registered trademark, manufactured by ZEONOR, manufactured by ZEON CORPORATION), and cyclic olefin copolymer (COC). (Registered trademark, manufactured by Mitsui Chemicals, Inc.) can be used, and other cycloolefin polymers, polycarbonate, polyvinyl alcohol, cellulose triacetate, and the like can also be used.
本発明に係る光学素子について、性能向上を表す耐光性試験を実施した。 About the optical element which concerns on this invention, the light resistance test showing a performance improvement was implemented.
その試験の光学特性（透過波面収差）データを表１に示す。
未処理のサンプルは、積算光量１Ｗｈ／ｍｍ2の光照射で透過波面収差の値が大きく変化し、劣化が確認された。 In the untreated sample, the value of the transmitted wavefront aberration was significantly changed by light irradiation with an integrated light amount of 1 Wh / mm 2 , and deterioration was confirmed.
処理したサンプルは、複数回試験したが、積算光量１、３、６、１６Ｗｈ／ｍｍ2まで照射しても収差変化はなく、劣化は確認できなかった。なお、照射した波長はブルーレイディスクに用いられる波長４０５ｎｍであった。なお、３９０ｎｍ〜４２０ｎｍの範囲のいずれの波長であってもよい。 The treated sample was tested a plurality of times. Even when the accumulated light amount was irradiated to 1, 3, 6, 16 Wh / mm 2, there was no change in aberration, and deterioration could not be confirmed. The irradiated wavelength was 405 nm used for the Blu-ray disc. Any wavelength in the range of 390 nm to 420 nm may be used.
表１のデータからも明らかなように、未処理（積算光量１Ｗｈ／ｍｍ２）のサンプルは、劣化により使用不可（×）であった。処理済（積算光量１６Ｗｈ／ｍｍ２まで）のサンプルは、劣化なく使用可能（○）であった。 As is clear from the data in Table 1, the untreated sample (integrated light amount 1 Wh / mm 2 ) was unusable (x) due to deterioration. Samples that had been processed (up to 16 Wh / mm 2 in accumulated light amount) were usable (◯) without deterioration.
これらの比較結果から、光学素子の耐光性は１０倍以上改善されたといえる。 From these comparison results, it can be said that the light resistance of the optical element was improved by 10 times or more.
以上の実験結果から、ブルーレイディスク装置に用いられる光学素子において、酸素を遮断する性質をもつ膜を光学素子の表面、裏面、側面に積層（あるいは、塗布）することにより、例えば３９０ｎｍ〜４２０ｎｍなどの短波長のブルーレイのレーザ光においても、光学素子は、白濁・劣化することなく、再生、録音、録画などの記録のために用いることができることが確認できた。 From the above experimental results, in the optical element used in the Blu-ray disc device, by laminating (or coating) a film having a property of blocking oxygen on the front surface, back surface, and side surface of the optical element, for example, 390 nm to 420 nm, etc. It was confirmed that the optical element can be used for recording such as reproduction, recording, video recording and the like without white turbidity and deterioration even in a short wavelength Blu-ray laser beam.
また、従来は短波長レーザへの耐久性の問題から、ブルー用光学素子としては水晶やガラスなどの無機材料が使用されているが、本発明によって、光学素子材料として樹脂材料を用いることが可能になった。すなわちブルーレイなどの短波長レーザに適用可能な光学素子材料を無機材料から樹脂材料へのシフトさせることができ、記録、再生装置製造コストを大きく低減させることが可能になった。 Also, conventionally, inorganic materials such as quartz and glass have been used as blue optical elements due to the problem of durability against short wavelength lasers, but resin materials can be used as optical element materials according to the present invention. Became. That is, an optical element material applicable to a short wavelength laser such as Blu-ray can be shifted from an inorganic material to a resin material, and the manufacturing cost of recording and reproducing apparatus can be greatly reduced.
Claims (1)
素子表面が酸素と反応することを防止するために、酸素を遮断する性質を持つ膜が、素子の最外層に積層されており、
光学素子が、波長板であり、
酸素を遮断する性質を持つ膜が、波長板の、ブルーレイのレーザ光が透過する領域を含む表面及び裏面の全体と側面の全体に酸素バリア層として積層されており、
３９０〜４２０ｎｍの短波長のブルーレイのレーザ光が波長板に照射される際に、積算光量１、３、６、１６Ｗｈ/ｍｍ ２ まで照射しても、透過波面収差が０．００４〜０．００５であることを特徴とする光学素子。 In an optical element used in a Blu-ray disc device for recording and reproduction,
In order to prevent the element surface from reacting with oxygen, a film having a property of blocking oxygen is laminated on the outermost layer of the element ,
The optical element is a wave plate;
A film having a property of blocking oxygen is laminated as an oxygen barrier layer on the entire surface and the back surface and the entire side surface of the wave plate including the region through which the laser beam of Blu-ray is transmitted,
When a blue-ray laser beam having a short wavelength of 390 to 420 nm is irradiated onto the wave plate , the transmitted wavefront aberration is 0.004 to 0.005 even if the accumulated light amount is irradiated to 1, 3, 6, 16 Wh / mm 2. wherein the optical element is at.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008281297A JP5118606B2 (en) | 2008-10-31 | 2008-10-31 | Optical element |
| CN200910211671A CN101726766A (en) | 2008-10-31 | 2009-10-30 | Optical element |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008281297A JP5118606B2 (en) | 2008-10-31 | 2008-10-31 | Optical element |
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| JP2010107835A JP2010107835A (en) | 2010-05-13 |
| JP5118606B2 true JP5118606B2 (en) | 2013-01-16 |
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| JP2002060506A (en) * | 2000-08-21 | 2002-02-26 | Mitsubishi Chemicals Corp | Plastic substrate having high dimensional stability |
| JP4447224B2 (en) * | 2003-02-12 | 2010-04-07 | 旭化成株式会社 | Optical materials and optical products |
| JP2008181649A (en) * | 2008-02-01 | 2008-08-07 | Hoya Corp | Objective lens for optical pickup |
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| CN101726766A (en) | 2010-06-09 |
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