JPS6047244A - Optical pickup device - Google Patents
Optical pickup deviceInfo
- Publication number
- JPS6047244A JPS6047244A JP58156147A JP15614783A JPS6047244A JP S6047244 A JPS6047244 A JP S6047244A JP 58156147 A JP58156147 A JP 58156147A JP 15614783 A JP15614783 A JP 15614783A JP S6047244 A JPS6047244 A JP S6047244A
- Authority
- JP
- Japan
- Prior art keywords
- light
- objective lens
- optical
- optical fiber
- light source
- 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 abstract description 32
- 239000013307 optical fiber Substances 0.000 claims abstract description 13
- 238000001514 detection method Methods 0.000 claims 1
- 230000007246 mechanism Effects 0.000 abstract description 14
- 239000000835 fiber Substances 0.000 abstract description 6
- 230000015654 memory Effects 0.000 abstract description 2
- 230000004907 flux Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 3
- 206010041662 Splinter Diseases 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
-
- 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
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0925—Electromechanical actuators for lens positioning
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Optical Head (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は光ディスク等の信号を読み取る光ピツクアップ
装置の構造、特に光路に光ファイバーを用いた光ピック
アイラ°装置Ｖこ関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of an optical pickup device for reading signals from optical discs, etc., and particularly to an optical pickup device V that uses an optical fiber in the optical path.
従来の光ピツクアップ装置の例を第１図、第２図に示す
。第１図に於て、１は光ディスク、２は光集束手段とし
ての対物レンズ、６はＡ波長板、４は偏光ビームスプリ
ッタ、５は光検出器、６はコリメータレンズ、７は光源
としての半導体レーザ、８及び９はフォーカス及びトラ
ッキング方向への光スポツト移動の／ζめの対物レンズ
移動機構である。次にこの動作を簡単に説明する。まず
、半導体レーザ７から出た光は直線偏光であり、コリメ
ータレンズ乙にょジ、並行光線にされる。そして偏光ビ
ームスグリツタ４を通り、Ａ波長板３に入射される。Ａ
波長板３を通シぬけた光は円偏光に変換され、対物レン
ズ２によって集束されて光ディスク１に照射される。デ
ィスクの情報記録面で反射した光（は逆回りの円偏光と
なり、再び対物レンズ、Ａ波長板を通る。そうすると、
１４波長板を通りぬけた反射光は、半導体レーザ７から
出た光と偏光軸が９０度異なる直砿偏光となり、偏光ビ
ームスプリンタ４で反射され、光検出器５に入射する。Examples of conventional optical pickup devices are shown in FIGS. 1 and 2. In FIG. 1, 1 is an optical disk, 2 is an objective lens as a light focusing means, 6 is an A wavelength plate, 4 is a polarizing beam splitter, 5 is a photodetector, 6 is a collimator lens, and 7 is a semiconductor as a light source. Lasers 8 and 9 are objective lens moving mechanisms for moving the light spot in the focusing and tracking directions. Next, this operation will be briefly explained. First, the light emitted from the semiconductor laser 7 is linearly polarized light, which is turned into parallel light by the collimator lens. The light then passes through the polarizing beam sinter 4 and is incident on the A wavelength plate 3 . A
The light passing through the wavelength plate 3 is converted into circularly polarized light, focused by the objective lens 2, and irradiated onto the optical disc 1. The light reflected from the information recording surface of the disk becomes circularly polarized light in the opposite direction and passes through the objective lens and A wavelength plate again. Then,
The reflected light that has passed through the 14-wavelength plate becomes orthogonally polarized light whose polarization axis differs by 90 degrees from the light emitted from the semiconductor laser 7, is reflected by the polarized beam splinter 4, and enters the photodetector 5.
この光検出器５は、通常４または６分割され７ヒフオト
ダイオードであり、個々の光検出器からの出力信号を処
理することにより、記録信号、フォーカス誤差信号９ト
ラツキング誤差信号を同時に得ることができる。そして
、このフォーカス誤差信号、トラッキング誤差信号の出
力に応じて、対物レンズ移動機構８，９に制御１言号が
印加され、常に光スポットは情報トンツク上に焦点金納
ぶように制御される。第２図は、ラジアル移動機構の例
であり、１ｏは第１図に示しｆｃ元ビックアンプ、１１
はラジアル送りモータ、１２はディスク回転モータであ
る。光ディスク１の記録信号を読取るためには、前記光
ピンクアップ１０をディスク１０半径方向（ラジアル方
向）に移動させる必要があり、従来はラジアル送タモー
タ１１により、光ピツクアップ全体をラジアル方向に動
かしていた。しかし、光ピンクアンプ全体を動かすとい
うことは、被駆動物の重量が大きくなってしまうという
ことであυ、高速アクセス化の大きな障害となっていた
。This photodetector 5 is usually a 7-hi photodiode divided into 4 or 6 parts, and by processing the output signals from each photodetector, it is possible to simultaneously obtain a recording signal, a focusing error signal, and 9 tracking error signals. can. Then, in accordance with the output of the focus error signal and the tracking error signal, one control word is applied to the objective lens moving mechanisms 8 and 9, and the light spot is controlled so as to always focus on the information track. Figure 2 is an example of a radial movement mechanism, where 1o is the fc original big amplifier shown in Figure 1, and 11
1 is a radial feed motor, and 12 is a disk rotation motor. In order to read the recorded signal on the optical disc 1, it is necessary to move the optical pickup 10 in the radial direction of the disc 10. Conventionally, the entire optical pickup was moved in the radial direction by a radial feed motor 11. . However, moving the entire optical pink amplifier means that the weight of the driven object increases, which is a major obstacle to high-speed access.
そこで本発明は、上記の欠点をなくし、高速アクセスが
可能な光ピンクアンプ装置を供することを目的とするも
のである。SUMMARY OF THE INVENTION An object of the present invention is to provide an optical pink amplifier device that eliminates the above-mentioned drawbacks and allows high-speed access.
以下図面とともに本発明の説明をしていく。The present invention will be explained below with reference to the drawings.
第６図に本発明の光ピツクアップの構成を示す。FIG. 6 shows the configuration of the optical pickup of the present invention.
第３図に於て、１〜９までｌ′ｉ第１図の例と同じであ
り、１５は光ファイバーである。動作は基本的には第１
図の例と同じであるが、光集束手段としての対物レンズ
２に光源７からの光を導びき、さらに反射光を対物レン
ズ２から光検出器５に導びくために元ファイバー１３を
用いたものである。In FIG. 3, 1 to 9 are the same as the example in FIG. 1, and 15 is an optical fiber. The movement is basically the first
Although it is the same as the example shown in the figure, the original fiber 13 is used to guide the light from the light source 7 to the objective lens 2 as a light focusing means, and further guide the reflected light from the objective lens 2 to the photodetector 5. It is something.
ここで、光ファイバー１６は複数本のファイバーを束ね
たものであり、さらに偏波面保存ファイバーで構成され
る。とのような構成にすることにより、光ファイバーは
フレキシブルなので、対物レンズ２を、他の光学系すな
わち、し′４板６、偏光ビームスプリッタ４、光検出器
５、コリメータレンズ６、光源７などと独立に動かすこ
とが可能となる。従って、第６図に示すビックアンプ装
置を用いたラジアル移動機構は第４図の如くになる。Here, the optical fiber 16 is a bundle of a plurality of fibers, and is further composed of a polarization-maintaining fiber. Since the optical fiber is flexible, the objective lens 2 can be connected to other optical systems, such as the shield plate 6, the polarizing beam splitter 4, the photodetector 5, the collimator lens 6, and the light source 7. It can be moved independently. Therefore, the radial movement mechanism using the big amplifier device shown in FIG. 6 is as shown in FIG. 4.
すなわち、トラック及びフ万−カス方向への対物レンズ
移動機構と対物レンズを含めた対物レンズ装置１４のみ
をラジアル方向に移動°させれば良いのである。そして
、その他ダの光字系１６ｉｄ固定し′〔おき、対物レン
ズとファイバー１６により光学的に接合される。このよ
′）ノよラジアル移動・麦４．含にすることによυ、対
」勿しンズ装”１＋＃ １４の３久全ラジアル方向に移
動させるので、被駆動物の層涜が大幅に軽減され、楢初
の目的でめった高速アクセスが町１止な光ピツクアップ
装置を実現することができるのである。That is, it is sufficient to move only the objective lens device 14 including the objective lens moving mechanism and the objective lens in the track and focus directions in the radial direction. Then, the other optical system 16id is fixed and optically connected to the objective lens by the fiber 16. This') noyo radial movement - Mugi 4. By making it possible to move the driven object in the radial direction, the displacement of the driven object is greatly reduced, and the rare high-speed access is possible for the first purpose of Nara. This makes it possible to realize an optical pickup device that is the only one in town.
′また、第６図。４４図の例に於ては対物レンズ装置と
して、フォーカス超勤機構８、トラック駆動機構９、対
物レンズ２を含んでいるが、トランク１駆動機構の機能
をラジアル移動機構に含めることもできる。その場合は
対物レンズ装置とし′Ｃ、フォーカス駆動機Ｉ＃８と対
物レンズ２のの、となり、ラジアル移動の被駆動物をさ
らに軽量、小型化できる。'Also, Figure 6. In the example shown in FIG. 44, the objective lens device includes a focus shift mechanism 8, a track drive mechanism 9, and an objective lens 2, but the function of the trunk 1 drive mechanism can also be included in the radial movement mechanism. In that case, the objective lens device is comprised of the focus driver I#8 and the objective lens 2, and the radially moving driven object can be further reduced in weight and size.
以上のような本発明の光ピツクアップ装置を用いること
により、光ビツクアップの大きな問題点の１つであった
高速アクセス化が容易となり、光デイスクメモリの応用
範囲を大幅に拡げることが可能となる。By using the optical pickup device of the present invention as described above, high-speed access, which has been one of the major problems in optical pickup, is facilitated, and the range of applications of optical disk memories can be greatly expanded.
第１図は、従来の光ピンクアップ装置を示す構成図、第
２図は従来の光ピツクアップ装置を用いたラジアル移動
機構を示す説明図、第３図は本発明の光ピツクアップ装
置を示す構成−、第４図は本発明の光ピツクアップ装置
を用いたラジアル移動機構を示す説明図である。
１・・・・・・光ディスク ２・・・・・・対物レンズ
３・・・・・・し′４板
４・・・・・・偏光ビームスプリンタ
５・・・・・・光検出器
６・・・・・・コリメータレンズ
７・・・・・・光源
８・・・・・・フォーカス駆動機構
９・・・・・・トラック駆動機構
１３・・・・・・光フアイバー束
１４・・・・・・対物レンズ装置
１５・・・・・・ラジアル送！、ｌ駆動装置１６・・・
・・・光学部
以 上
出願人 株式会社 第二梢工舎FIG. 1 is a configuration diagram showing a conventional optical pickup device, FIG. 2 is an explanatory diagram showing a radial movement mechanism using the conventional optical pickup device, and FIG. 3 is a configuration diagram showing the optical pickup device of the present invention. , FIG. 4 is an explanatory diagram showing a radial movement mechanism using the optical pickup device of the present invention. 1... Optical disc 2... Objective lens 3... Plate 4... Polarizing beam splinter 5... Photo detector 6. ... Collimator lens 7 ... Light source 8 ... Focus drive mechanism 9 ... Track drive mechanism 13 ... Optical fiber bundle 14 ... ...Objective lens device 15... Radial feed! , l drive device 16...
...Faculty of Optics and above Applicant Daini Kozue Kosha Co., Ltd.
Claims (3)
束する光集束手段と、前記対象物からの反射光を検出す
る光、検出手段を少なくとも具備する光学式ピックアッ
プ綴直に於て、前記光集束手段と光源、光検出子役の間
に光ファイバーを配置したことを特徴とする光学式ピッ
クアップ装置。(1) In an optical pick-up orienting device, which includes at least a light source, a light focusing means for focusing the light emitted from the light source onto a target object, and a light detecting means for detecting the light reflected from the target object. . An optical pickup device, characterized in that an optical fiber is disposed between the light focusing means, a light source, and a light detection element.
置したことを特徴とする特許請求の範囲第１項記載の光
ピックアップ装置η：５(2) The optical pickup device according to claim 1, characterized in that the optical fibers are arranged in a bundle of ¥i4 or more.
イバーのみ全移動さ亡ることＫ 、ｌニジ行なうことを
特徴とする特許請求の範囲第１項又は第２項記載の光ピ
ツクアップ装置。(3) The optical pickup device according to claim 1 or 2, wherein the light spot is moved by completely moving only the light focusing means and the optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58156147A JPS6047244A (en) | 1983-08-26 | 1983-08-26 | Optical pickup device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58156147A JPS6047244A (en) | 1983-08-26 | 1983-08-26 | Optical pickup device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6047244A true JPS6047244A (en) | 1985-03-14 |
Family
ID=15621355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58156147A Pending JPS6047244A (en) | 1983-08-26 | 1983-08-26 | Optical pickup device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6047244A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02252136A (en) * | 1989-03-24 | 1990-10-09 | Sumitomo Electric Ind Ltd | Optical system for optical disk |
| WO1998009285A1 (en) * | 1996-08-27 | 1998-03-05 | Quinta Corporation | Magneto-optical data storage system with high capacity |
| WO1998009280A1 (en) * | 1996-08-27 | 1998-03-05 | Quinta Corporation | Single-frequency laser source for optical data storage system |
-
1983
- 1983-08-26 JP JP58156147A patent/JPS6047244A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02252136A (en) * | 1989-03-24 | 1990-10-09 | Sumitomo Electric Ind Ltd | Optical system for optical disk |
| WO1998009285A1 (en) * | 1996-08-27 | 1998-03-05 | Quinta Corporation | Magneto-optical data storage system with high capacity |
| WO1998009280A1 (en) * | 1996-08-27 | 1998-03-05 | Quinta Corporation | Single-frequency laser source for optical data storage system |
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