JPS62264454A - Optical pickup device - Google Patents
Optical pickup deviceInfo
- Publication number
- JPS62264454A JPS62264454A JP61108062A JP10806286A JPS62264454A JP S62264454 A JPS62264454 A JP S62264454A JP 61108062 A JP61108062 A JP 61108062A JP 10806286 A JP10806286 A JP 10806286A JP S62264454 A JPS62264454 A JP S62264454A
- Authority
- JP
- Japan
- Prior art keywords
- grating
- convergence
- grating coupler
- pickup device
- coupler
- 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.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims description 8
- 239000010409 thin film Substances 0.000 claims abstract 3
- 239000000758 substrate Substances 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 abstract description 5
- 238000000576 coating method Methods 0.000 abstract description 5
- 239000000428 dust Substances 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- 239000010408 film Substances 0.000 abstract 1
- 239000000126 substance Substances 0.000 abstract 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
イ、学業上の利用分野
本発明は集積化され定党学式のピックアップ装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION A. Field of Academic Use The present invention relates to an integrated, fixed-order pick-up device.
口、従来の技術
従来、光学式ピックアップ装置にレンズ、プリズム等独
立し之微小な光学素子により組立てられてい之０しかし
、最近に於いて、光学素子を集積化することが提案され
ている０斯かる技術は光メモリシンポジウム１９８５年
輪文集第１１３頁ないし第１２０頁に紹介されている。BACKGROUND OF THE INVENTION Conventionally, optical pickup devices have been assembled with independent microscopic optical elements such as lenses and prisms. However, recently it has been proposed to integrate optical elements. This technology is introduced in the Optical Memory Symposium 1985 Ring Bunshu, pages 113 to 120.
その概略に第２図に示す通りである。８１基板ｔｌｌ上
にバッファ層１２＋ ｆ介して光導波層１３＋が形成さ
れている。この光導波層（３１の導波路にフォトダイオ
ード＋４１、集光グレーティングカップラ１５１、導波
形ビームスプリフタ（６１が集積イヒされて形成される
つ更に、レーザダイオード（７）が導波路に対して端面
結合される。The outline is as shown in FIG. An optical waveguide layer 13+ is formed on the 81 substrate tll via a buffer layer 12+f. This optical waveguide layer (31) is formed by integrating a photodiode +41, a condensing grating coupler 151, and a waveguide beam splitter (61). be combined.
レーザダイオード１７）に端面結合により二次元の発散
導Ｕ元を励振する０その導波光は集光グレーティングカ
フブラ（５１にて回折され、ディスク（Ｄ）面上に集光
される。ディスクからの反射元に集光グレーティングカ
ヮプラｔ５＋にて逆結合され、再び導波層の導波路に導
かれ、導波形ビームスプリッタ（６１で二分割され、フ
ォトダイオード１４ＨＪ上に集光され、トラッキングエ
ラー信号、フォーカスエラー信号、データ信号が導出き
れる。A two-dimensional diverging guiding light is excited by edge coupling to a laser diode 17). The guided light is diffracted by a condensing grating cuff blur (51) and focused on the disk (D) surface. The light is reversely coupled to the reflection source by a focusing grating coupler t5+, guided again to the waveguide of the waveguide layer, split into two by a waveguide beam splitter (61), focused on a photodiode 14HJ, and output a tracking error signal. , focus error signal, and data signal can be derived.
ハ、発明が解決しようとする問題点
集光グレーティングカップラ４極めて微小な凹凸Ｗを有
するので、この部分全ゴミや傷等より保護する必要があ
る。C. Problems to be Solved by the Invention Since the condensing grating coupler 4 has extremely minute irregularities W, it is necessary to protect all of these parts from dust, scratches, etc.
二、問題点を解決する為の手段
そこで、本発明は、集光グレーディングカップラを簿嗅
被覆する構成とする。2. Means for Solving the Problems Therefore, the present invention has a structure in which the condensing grading coupler is coated with a light shield.
ホ、作 用
被覆により、集光グレーテイングカワプラが直接露出す
ることがなく、ゴミ、傷等より保護される０
へ、実施例
第１図に集光グレーティングカフブラ１４）部分の断面
図全示しており、グレーティングは厚さｇ−０，０３５
ａｍ、周期１）−０−５２〜０．７５ ｐ ｍ トイう
極めて微細な凹凸となっている。そしてグレーティング
を、グレーテイング層よりも屈折率が小さく、しかも化
学的に安定な材料でＮ嗅被覆（８１する。被覆材料の屈
折率、模厚に、グレーティングの集光特性、回折効率全
考慮して決定する。E. Due to the functional coating, the condensing grating cuff bra 14) is not exposed directly and is protected from dust, scratches, etc.0. and the grating has a thickness g-0,035
am, period 1) -0-52 to 0.75 p m It has extremely fine irregularities. The grating is then coated with N (81) using a material that has a lower refractive index than the grating layer and is chemically stable.The refractive index and thickness of the coating material, the light-gathering properties of the grating, and the diffraction efficiency are all taken into consideration. to be determined.
ト、発明の効果
４嗅被覆により、集光グレーティングカップラ全ゴミ、
傷等より良好に保護することができる。Effects of the invention 4. The light-condensing grating coupler can be completely removed by the olfactory coating.
It can better protect against scratches, etc.
＠１図に本発明に係るピ・・ｐクアフプの断面図、第゛
２図に従来の集積化され之ビフクアフプの斜視図である
。
＋４１１Ｃフオトダイオード、＋５１ｉ集元グレーティ
ングカップラ、１６１ニ導波形ビームスプリツタ、１７
１はレーザダイオード、ｔ８１ ｄ ′４９被覆。FIG. 1 is a cross-sectional view of a p.p.fk amplifier according to the present invention, and FIG. 2 is a perspective view of a conventional integrated bifukufup. +411C photodiode, +51i concentration grating coupler, 161 waveguide beam splitter, 17
1 is a laser diode, t81 d'49 coated.
Claims (1)
グカップラ、導波形ビームスプリッタが集積化された光
学式ピックアップ装置であって、前記集光グレーティン
グカップラが薄膜被覆されていることを特徴とする光学
式ピックアップ装置。(1) An optical pickup device in which a photodiode, a condensing grating coupler, and a waveguide beam splitter are integrated on a substrate, the condensing grating coupler being coated with a thin film. pickup device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61108062A JPS62264454A (en) | 1986-05-12 | 1986-05-12 | Optical pickup device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61108062A JPS62264454A (en) | 1986-05-12 | 1986-05-12 | Optical pickup device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62264454A true JPS62264454A (en) | 1987-11-17 |
Family
ID=14474930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61108062A Pending JPS62264454A (en) | 1986-05-12 | 1986-05-12 | Optical pickup device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62264454A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01302304A (en) * | 1988-05-31 | 1989-12-06 | Agency Of Ind Science & Technol | Waveguide type passive circuit added with grating |
| JPH021802A (en) * | 1987-12-21 | 1990-01-08 | Physical Opt Corp | Optical connector |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60202553A (en) * | 1984-03-27 | 1985-10-14 | Nec Corp | Waveguide path type optical head |
| JPS6111947A (en) * | 1984-06-27 | 1986-01-20 | Canon Inc | Optical head device |
-
1986
- 1986-05-12 JP JP61108062A patent/JPS62264454A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60202553A (en) * | 1984-03-27 | 1985-10-14 | Nec Corp | Waveguide path type optical head |
| JPS6111947A (en) * | 1984-06-27 | 1986-01-20 | Canon Inc | Optical head device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH021802A (en) * | 1987-12-21 | 1990-01-08 | Physical Opt Corp | Optical connector |
| JPH01302304A (en) * | 1988-05-31 | 1989-12-06 | Agency Of Ind Science & Technol | Waveguide type passive circuit added with grating |
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