JPS6079539A - Optical signal processing device - Google Patents
Optical signal processing deviceInfo
- Publication number
- JPS6079539A JPS6079539A JP58186442A JP18644283A JPS6079539A JP S6079539 A JPS6079539 A JP S6079539A JP 58186442 A JP58186442 A JP 58186442A JP 18644283 A JP18644283 A JP 18644283A JP S6079539 A JPS6079539 A JP S6079539A
- Authority
- JP
- Japan
- Prior art keywords
- light
- photodetecting
- light source
- light receiving
- layer
- 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
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Head (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は光ディスク、光テープといった光での記録、再
生、消去などを行なう装置に関するものである。従って
、コンピュータを中心としたデータ処理装置として、ま
た、ＴＶ信号を中心とした映像１画像処理装置として、
ＯＡ、ＨＡ、ニューメディア分野に広く利用が可能であ
る。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an apparatus for recording, reproducing, erasing, etc. using light, such as an optical disk or an optical tape. Therefore, as a data processing device centered on a computer, and as a video 1 image processing device centered on TV signals,
It can be widely used in OA, HA, and new media fields.
従来例の構成とその問題点
現在用いられている光ディスクの再生用光学系の代表的
な構成例を第１図に示す。1. Conventional Structure and Its Problems FIG. 1 shows a typical structure of a currently used optical system for reproducing optical discs.
半導体レーザ１より出射した光はレンズ２及び３を通過
した後平行ビームとなり、ビームスプリンタ４を通過し
、さらにλ／４波長板５を通過し集束レンズ６によって
記録媒体１２上に集束される。記録媒体１２で反射され
た光は逆の光路を通り、レンズ６、λ／４板６を透過後
平行ビームとなシビームスグリッタ４で反射される。そ
して、レンズ７を透過後は反射ミラー８によって２つの
ビームに分割され受光素子１０および１１で受信される
。このように記録媒体１２に記録された信号は光強度変
化として受光素子１０．１１で受信されるとともに、複
数個装置された受光素子１゜および１１によって記録媒
体のトラッキングあるいは記録面上へのフォーカシング
を同時に行なっている。The light emitted from the semiconductor laser 1 passes through lenses 2 and 3, becomes a parallel beam, passes through a beam splinter 4, further passes through a λ/4 wavelength plate 5, and is focused onto a recording medium 12 by a focusing lens 6. The light reflected by the recording medium 12 passes through the opposite optical path, passes through the lens 6 and the λ/4 plate 6, and is then reflected by the beam slitter 4 into a parallel beam. After passing through the lens 7, the light is split into two beams by the reflecting mirror 8 and received by the light receiving elements 10 and 11. The signal recorded on the recording medium 12 in this way is received by the light receiving element 10.11 as a change in light intensity, and the plurality of light receiving elements 1° and 11 perform tracking of the recording medium or focusing on the recording surface. are being carried out at the same time.
このような光学系において、レーザ光の損失を小さく、
なおかつ、レーザビームを１μ程度に絞る必要性がある
ために、組みレンズで収差の少ない高性能なレンズが必
要であり、その他部品として高性能なもあを必要として
いる。したがって、第１図の装置では高価であるばかり
か部品点数も多く、調整個所も多く、信頼性を欠きやす
い欠点も有しＶ我ｔｆＣ，光学ヘッド部の重量が重く大
きくなり、小型化への制約となっていた。さらに、必然
的に駆動系への負担も大きくなっていた。In such an optical system, the loss of laser light is reduced,
Furthermore, since it is necessary to narrow down the laser beam to about 1 μm, a high-performance lens with little aberration is required in the assembled lens, and high-performance mirrors are required as other components. Therefore, the device shown in Figure 1 is not only expensive, but also has many parts, many adjustment points, and tends to be unreliable. It was a constraint. Furthermore, the load on the drive system was inevitably increased.
発明の目的
そこで本発明は光源部と受光素子部を一悄ｌにすること
によって軽量、安価な記録、再生、消去あるいは制御等
を可能とする装置を提供するものである。OBJECTS OF THE INVENTION Accordingly, the present invention provides a light-weight and inexpensive device that enables recording, reproduction, erasing, control, etc. by integrating a light source section and a light receiving element section into one unit.
発明の構成
本発明は、平板状あるいはテープ状媒体に形成された凹
凸あるいは屈折率や反射率の違いによって形成された記
録信号をもつ記録媒体を有し、光源と複数の受光素子を
同一基体上に構成した光学ヘッド部を有し、前記記録媒
体と光学ヘッドの間に集束用レンズを介して光信号を伝
達させ、光学的信号の記録機能、再生機能、消去機能あ
るいは位置制御機能等９機能を行なう光学的信号処理装
置を性徴とするもの、である。Structure of the Invention The present invention has a recording medium having a recording signal formed by unevenness formed on a flat or tape-shaped medium or a difference in refractive index or reflectance, and a light source and a plurality of light receiving elements are mounted on the same substrate. It has an optical head section configured as shown in FIG. The sexual characteristic is an optical signal processing device that performs this.
実施例の説明
本発明の基本構成図を第２図に示す。２１は記録媒体を
示し、２ｏは集積化基体、２２は記録媒体上にλ／４・
あるいはλ／２程度の段差が設けられており信号の記録
されている面を示している。DESCRIPTION OF EMBODIMENTS A basic configuration diagram of the present invention is shown in FIG. 21 indicates a recording medium, 2o an integrated substrate, and 22 a λ/4.
Alternatively, a level difference of about λ/2 is provided, indicating a surface on which a signal is recorded.
２３は集束用レンズ系、２４は光源部であり、２５．２
６は受光部を示す。まず光源部２４より出射した光はレ
ンズ系２３によって記録媒体２１に集束される。また、
記録媒体で反射された光は再度レンズ系２３を通り受光
部２６や２６で受信される。このように各光学素子を配
置することによって、記録、再生、消去という各機能を
行なうことができるとともに位置制御としてトラッキン
グ、フォーカシングの機能も可能となる。23 is a focusing lens system, 24 is a light source section, and 25.2
6 indicates a light receiving section. First, light emitted from the light source section 24 is focused onto the recording medium 21 by the lens system 23. Also,
The light reflected by the recording medium passes through the lens system 23 again and is received by the light receiving section 26 or 26. By arranging each optical element in this way, each function of recording, reproducing, and erasing can be performed, and also functions of tracking and focusing as position control can be performed.
一体化光源、受光部の形成された基体２ｏの平面および
断面図の一具体例を第３図に示す。２７は一体化ヘッド
部を示し、２Ｂ 、２９，３０．３１は受光部であり、
３２は光源部である。このような光学ヘッド部の構成を
化合物半導体で構成する場合の１例を示すと、第３図に
おいてＧ ａ Ａ ｓ基体３４上に多層エピタキシャル
成長によってＡｊｌＧａＡｓよりなる面発光半導体レー
ザ３２を構成する。受 。FIG. 3 shows a specific example of a plan view and a cross-sectional view of the base body 2o in which an integrated light source and a light receiving section are formed. 27 shows an integrated head part, 2B, 29, 30. 31 are light receiving parts,
32 is a light source section. As an example of the structure of such an optical head section made of a compound semiconductor, as shown in FIG. 3, a surface emitting semiconductor laser 32 made of AjlGaAs is formed on a GaAs substrate 34 by multilayer epitaxial growth. Received.
元部２Ｂ 、２９．３０．３１はＧ ａ Ａ ｓ層で形
成しｐ−１−ｎ構造のダイオードとする。３３は発光部
および受光部を電気的に分離する絶縁層であるしても作
用する。光源部３２は面発光レーザだけでなく、発光ダ
イオードとすることも可能である。The base portions 2B, 29, 30, and 31 are formed of GaAs layers and are diodes with a p-1-n structure. It also works even if 33 is an insulating layer that electrically separates the light emitting part and the light receiving part. The light source section 32 can be not only a surface emitting laser but also a light emitting diode.
いま、受光部２８．３０をトラッキング用受光素子とし
たときの光ビームの装置づれと各素子の光出力の相対関
係を第４．５．６図に示す。第４図のように記録部２２
より光ビームがずれると受光部３ｏは回折によって出力
は増大し受光部２８の出力は減少する。一方第６図のよ
うに反対にずれ力は減少する。第６図のようにビームが
正常な位置に走査していると１には記録部２２０段差に
よって出力のグロファイルは実線又は破線のようになる
がいずれの場合も受光部２８および２９ははソ同じ出力
へなる。従−て、受光部２８および２９が同一出力とな
るように制御することによって適性なトラッキング動作
を行なわすことができる。Now, when the light receiving sections 28 and 30 are used as tracking light receiving elements, the relative relationship between the device deviation of the light beam and the light output of each element is shown in FIG. 4.5.6. As shown in FIG.
When the light beam is further shifted, the output of the light receiving section 3o increases due to diffraction, and the output of the light receiving section 28 decreases. On the other hand, as shown in FIG. 6, the shear force decreases. As shown in Fig. 6, when the beam is scanning to a normal position, the output glo file will be a solid line or a broken line due to the step difference in the recording section 220, but in either case, the light receiving sections 28 and 29 are The output will be the same. Therefore, by controlling the light receiving sections 28 and 29 to have the same output, an appropriate tracking operation can be performed.
また、第３図において、受光部２９．３１はフォーカシ
ング用として使用することも可能である。Furthermore, in FIG. 3, the light receiving sections 29 and 31 can also be used for focusing.
この場合種々の方法が考えられるが、１例として受光部
２９．３１の受光部を半径方向に分割配置し、回折光強
度の半径方向分布状態を測定し、フォーカス位置を決め
ることができる。また、光源部３２は記録媒体に向けて
光が出射する部分を表わしておシ、必ずしも受光部と同
一平面上に位置する必要はない。受光部の面積、光源部
と受光部の距離などを考慮して受光部は反射光の結偉位
置より上、下にずらすことも可能であるばかりか、光源
部として光フチ１バを使用することもできる。In this case, various methods can be considered, but as an example, the light receiving portions of the light receiving portions 29 and 31 can be divided and arranged in the radial direction, and the radial distribution state of the diffracted light intensity can be measured to determine the focus position. Further, the light source section 32 represents a section from which light is emitted toward the recording medium, and does not necessarily need to be located on the same plane as the light receiving section. Considering the area of the light receiving part, the distance between the light source part and the light receiving part, etc., it is possible to move the light receiving part above or below the position where the reflected light is formed, or to use the optical edge 1 as the light source part. You can also do that.
光源部を光ファイバとし、受光部と光源部が同一平面状
にない場合を第７図に示す。FIG. 7 shows a case where the light source section is an optical fiber and the light receiving section and the light source section are not on the same plane.
第７図において第３図と同一のものには同じ番号で示さ
れている。３６はガラスファイバ、３６は１例として半
導体レーザを示す。３２は発光部すなわちファイバ３６
の光の出射点であり、受光部２８．３０と同一平面上に
位置していないが、受光部２Ｂ、３ｏとは一体化構造と
なっている。In FIG. 7, the same parts as in FIG. 3 are designated by the same numbers. 36 is a glass fiber, and 36 is a semiconductor laser as an example. 32 is a light emitting part, that is, a fiber 36
Although it is not located on the same plane as the light receiving sections 28 and 30, it has an integrated structure with the light receiving sections 2B and 3o.
３６はレーザ光源である。この第７図の一体化ヘッドを
用いても、大幅な小型化、軽量化、簡略化を達成するこ
とができる。36 is a laser light source. Even by using the integrated head shown in FIG. 7, it is possible to achieve significant size reduction, weight reduction, and simplification.
発明の効果
このように本発明のごとく光源部と受光部を一体化する
ことによって、（１）部品点数が減る。（２）構成が簡
単である。０）軽量、小型化できる。（４）安価である
。（６）信頼性が高い。などのすぐれた工業的効果を有
する光信号処理装置を実現することが可能となる。Effects of the Invention As described above, by integrating the light source section and the light receiving section as in the present invention, (1) the number of parts is reduced; (2) The configuration is simple. 0) Can be made lighter and smaller. (4) It is inexpensive. (6) High reliability. It becomes possible to realize an optical signal processing device having excellent industrial effects such as the following.
第１図は従来の光デイスク用光学系の基本構成図、第２
図は本発明における光デイスク光学系基本構成断面図、
第３図（ａ）は本発明の一実施例における光源、受光部
一体光学ヘッドの概略平面図、第３図（ｂ）は同０のｘ
−ｘ’ 線断面図、第４図（ａ）。
第６図（ａ）、第６図（−）は本発明の装置におけるト
ラッキング状態の断面図、第４図（ｂ）、第６図（ｂ）
、第６図［有］）は各（ａ）における受光出方特性図、
第４図（Ｃ）。
第６図（Ｃ）、第６図（ｃ）は発光部と受光部の配置図
、第７図は本発明の他の実施例の光フアイバ式光学ヘッ
ド部の断面図である。
２０・・・・・・基体、２１・・・・・・記録媒体、２
４・・・・・・光源部、２５．２６・・・・・・受光部
、２７・・・・・・一体化へ代理Δの氏名 升埋士 中
尾 敏 男 ほか１名第１図
０
第２図
第３図
第４図 ｉｓｉ
第６図Figure 1 is a basic configuration diagram of a conventional optical system for optical discs;
The figure is a sectional view of the basic configuration of the optical disk optical system according to the present invention.
FIG. 3(a) is a schematic plan view of an optical head integrated with a light source and a light receiving part in one embodiment of the present invention, and FIG. 3(b) is a schematic plan view of an optical head with an x
-x' line sectional view, FIG. 4(a). 6(a) and 6(-) are cross-sectional views of the tracking state in the device of the present invention, FIG. 4(b), and FIG. 6(b)
, FIG. 6 [present]) is a characteristic diagram of how light is received and output in each (a),
Figure 4 (C). 6(C) and 6(c) are layout diagrams of a light emitting section and a light receiving section, and FIG. 7 is a sectional view of an optical fiber type optical head section according to another embodiment of the present invention. 20...Base, 21...Recording medium, 2
4...Light source section, 25.26...Light receiving section, 27...Name of proxy Δ for integration Masu filler Toshio Nakao and 1 other person Figure 1 0 Figure 2 Figure 3 Figure 4 isi Figure 6
Claims (1)
有する記録媒体と、光源と複数の受光素子を同一基体に
一体形成した光学ヘッド部と、前記記録媒体と光学ヘッ
ド部間に配置された集束用レンズ部とを備え、前記光源
からの光を前記集束用レンズ部を介して前記媒体表面に
照射し、前記媒体表面からの反射光を前記集束用レンズ
を介して前記受光素子にて検知することを特徴とする光
学的信号処理装置。A recording medium having a recording signal formed by unevenness or a difference in refractive index or reflectance, an optical head unit having a light source and a plurality of light receiving elements integrally formed on the same substrate, and a focusing device disposed between the recording medium and the optical head unit. irradiating the medium surface with light from the light source via the focusing lens, and detecting reflected light from the medium surface with the light receiving element via the focusing lens. An optical signal processing device characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58186442A JPS6079539A (en) | 1983-10-05 | 1983-10-05 | Optical signal processing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58186442A JPS6079539A (en) | 1983-10-05 | 1983-10-05 | Optical signal processing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6079539A true JPS6079539A (en) | 1985-05-07 |
Family
ID=16188516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58186442A Pending JPS6079539A (en) | 1983-10-05 | 1983-10-05 | Optical signal processing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6079539A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7057999B2 (en) | 2000-01-20 | 2006-06-06 | Samsung Electronics Co., Ltd. | Optical head for near-field recording and reproduction, and method of manufacturing the same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51100628A (en) * | 1975-03-03 | 1976-09-06 | Hitachi Ltd |
-
1983
- 1983-10-05 JP JP58186442A patent/JPS6079539A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51100628A (en) * | 1975-03-03 | 1976-09-06 | Hitachi Ltd |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7057999B2 (en) | 2000-01-20 | 2006-06-06 | Samsung Electronics Co., Ltd. | Optical head for near-field recording and reproduction, and method of manufacturing the same |
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