JPS58114338A - Optical pickup - Google Patents
Optical pickupInfo
- Publication number
- JPS58114338A JPS58114338A JP21218381A JP21218381A JPS58114338A JP S58114338 A JPS58114338 A JP S58114338A JP 21218381 A JP21218381 A JP 21218381A JP 21218381 A JP21218381 A JP 21218381A JP S58114338 A JPS58114338 A JP S58114338A
- Authority
- JP
- Japan
- Prior art keywords
- pickup
- case
- semiconductor laser
- generating component
- optical axis
- 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
- G11B7/10—Interchangeable mountings, e.g. for replacement of head without readjustment including interchangeable electrical adjuster boards
Landscapes
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
- Optical Head (AREA)
Abstract
Description
【発明の詳細な説明】 この発明は光学式ピックアップに関するものである。[Detailed description of the invention] This invention relates to an optical pickup.
半導体レーザを使った光学式情報ｅ録装置および再生装
置（以後光学式記録再生装置と称す）は、従来よシある
ｉＩＩ！ｌｌＣヘッドによる録再方式、あるいは針によ
る再生方式と比べ、装置および配録媒体とも寿命時間が
長いことを特徴の一つとしている。Optical information e-recording and reproducing devices (hereinafter referred to as optical recording and reproducing devices) using semiconductor lasers are the same as conventional iii! One of the features of this method is that both the device and the recording medium have a longer lifespan than the recording/reproducing method using the 11C head or the reproducing method using a needle.
このうち記録媒体の方はその寿命は半永久的であるが、
装置の方には寿命があシ、その寿命は主として半導体レ
ーザの寿命によって決ま□る。しかもこの半導体レーザ
の寿命は個々のものについて大きなばらつきがあるため
、光学式記録再生装置において半導体レーザの交換が必
要不町決なものとなっている。Of these, recording media have a semi-permanent lifespan, but
The device has a limited lifespan, and that lifespan is mainly determined by the lifespan of the semiconductor laser. Furthermore, since the lifespan of these semiconductor lasers varies greatly from one device to another, it has become inevitable to replace semiconductor lasers in optical recording and reproducing devices.
第１図は光学式ピックアップの一例であに、半導体レー
ザ１のチップ２より出た光はコリメートレンズ３によっ
て平行光１１にな夛、偏光ビームスプリッタ４によって
上方に反射し丸後、四分の一波長板５を通過し、フォー
カスレンズ６によってディスク７の信号面に集光する。Figure 1 shows an example of an optical pickup, in which the light emitted from the chip 2 of the semiconductor laser 1 is converted into parallel light 11 by the collimating lens 3, reflected upward by the polarizing beam splitter 4, and then divided into circles and quarters. The light passes through the single-wavelength plate 5 and is focused onto the signal surface of the disk 7 by the focus lens 6.
この光はさらに信号面で反射し先後、四分の一波長板５
、偏光ビームスプリッタ４を通過し、レンズ系８によっ
てフォトディテクタ９上に結像する。This light is further reflected on the signal surface and sent to the quarter-wave plate 5.
, passes through the polarizing beam splitter 4, and is imaged onto a photodetector 9 by a lens system 8.
従来よｊ１提案されている光学式ピックアップは、第１
図のものに限らず、特に半導体レーザのみを交換するよ
うな手段は取られておらず、光学式ピックアップ全体を
交換する方法が取られることが予想される。しかしこの
方法は半導体レーザｌを交換する方法と比べてコスト的
に不利であり、将来半導体レーザ１の大量生産によるコ
ストダウンを考慮すると、半導体レーず１のみを交換す
る手段の方がますます望ましい４のとなってくる。The optical pickup that has been proposed conventionally is
In addition to what is shown in the figure, it is expected that a method of replacing only the semiconductor laser will not be taken, but a method of replacing the entire optical pickup will be taken. However, this method is disadvantageous in terms of cost compared to the method of replacing the semiconductor laser 1, and considering cost reduction due to mass production of the semiconductor laser 1 in the future, it is increasingly desirable to replace only the semiconductor laser 1. It comes to number 4.
また、光学式ピックアップ全体を交換する場合、フォー
カスレンズ６の位置、傾きのばらつき等に応じて様々な
調整を必要とするため、ユーザ自身が交換するのは非常
〈困難で、一旦メーカに引渡して交換すること′が予想
される。これはｍ記の部品コストと合わせて、輸送手段
の点でも不経済である。In addition, when replacing the entire optical pickup, various adjustments are required depending on the position of the focus lens 6, variations in tilt, etc., so it is extremely difficult for the user to replace it himself, and it is difficult to replace it by himself. Expected to be replaced. This is uneconomical in terms of the means of transportation as well as the cost of the parts mentioned in m.
以上の理由から光学式ピックアップ全体を交換するよプ
も、半導体レーザｌのみを交換する方がはるかに有利で
ある。しかしながら、半導体レーザｌのチップ２の位置
は、レーザｌの外枠のある基準面に対していくらかの寸
法公差を持っているうえ、コリメートレンズ３の焦点距
離もある！１度のばらつきがあるため、半４体レーザ１
ｏみを交換しても、コリメートレンズ３の通過ｗｋＫ光
軸対称の平行光線を得ることはできな込。For the above reasons, it is much more advantageous to replace only the semiconductor laser l than to replace the entire optical pickup. However, the position of the chip 2 of the semiconductor laser l has some dimensional tolerance with respect to the reference plane with the outer frame of the laser l, and there is also a focal length of the collimating lens 3! Since there is a variation of 1 degree, the half-quadruple laser 1
Even if the angle is changed, it is not possible to obtain parallel rays that are symmetrical about the optical axis passing through the collimating lens 3.
すなわち、第２図に示したように半導体レーザｌのチッ
プ２がコリメートレンズ３の光軸かうｆれ九場合は、レ
ンズ３０通過後平行光ｍＦ！得られるが光軸に対して傾
いた光束となる。また第３図に示したようにチップ２が
コリメートレンズ３の焦点よシも外側にあると、レンズ
３の通過後の光は集束光となる。これとは逆に焦点の内
側にチップ２があると、レンズ３０通過後に＠散光にな
ってしまう、また第４図のようにチップ２が正しい位置
にあってもコリメートレンズ３の焦点距離が長いとレン
ズ３０通過後に発散光になるし、逆にレンズ３の焦点距
離が短いと集束光になってしまう・
し是がって、この今明の目的は、煩雑な調整を行なうこ
となしに、藺単に半導体Ｖ−ずな交換することができ、
しかも半導体レーダの交換に伴う交換部品が少なくて済
む光学式ピックアップを提供することである。That is, as shown in FIG. 2, if the chip 2 of the semiconductor laser 1 is at an angle of 9 to the optical axis of the collimating lens 3, the parallel light mF! after passing through the lens 30! However, the resulting light beam is tilted with respect to the optical axis. Further, as shown in FIG. 3, when the chip 2 is located outside the focal point of the collimating lens 3, the light after passing through the lens 3 becomes convergent light. On the other hand, if the chip 2 is located inside the focal point, the light will become scattered after passing through the lens 30.Also, even if the chip 2 is in the correct position as shown in Figure 4, the focal length of the collimating lens 3 will be long. If the focal length of lens 3 is short, the light will become a divergent light after passing through the lens 30. Therefore, the purpose of this present invention is to make it possible to achieve a diverging light without making complicated adjustments. You can simply replace the semiconductor V-Zuna,
Moreover, it is an object of the present invention to provide an optical pickup that requires fewer parts to be replaced when replacing a semiconductor radar.
この発明の一実施例を第５図および第６図に示す。図に
おいて、１０はピックアップ本体ケース、１１は光軸対
称平行光線発生部品である。この平行光線発生部品１１
ｔｊ半導体レーず１とコリメートレンズ３とを円筒形ケ
ース１２内に組込み、コリメートレンズ３０通過後の光
がコリメートレンズ３の光軸に対して軸対称な平行光線
となるように予じめ調整したものである。円筒形ケース
１２の一端には端板１２Ｍが取付けられ、端板１２１の
背面に半導体レーザ１の端子ビン１３が突出している。An embodiment of this invention is shown in FIGS. 5 and 6. In the figure, 10 is a pickup main body case, and 11 is an optical axis-symmetrical parallel beam generating component. This parallel ray generating component 11
The semiconductor laser 1 and the collimating lens 3 are assembled in a cylindrical case 12, and adjusted in advance so that the light after passing through the collimating lens 30 becomes a parallel beam that is axially symmetrical with respect to the optical axis of the collimating lens 3. It is something. An end plate 12M is attached to one end of the cylindrical case 12, and a terminal pin 13 of the semiconductor laser 1 protrudes from the back surface of the end plate 121.
円筒形ケース１２は外周面に位置決めビン１４を有して
いる。ピックアップ本体ケース１０は第１図の偏光ビー
ムスプリッタ４と、四分の一波長板５と、フォーカスレ
ンズ６と、レンズ系８と、フォトディテクタ９とを内蔵
しており、かつ平行光線発生部品１１を嵌挿する円孔状
の嵌挿孔１８を有している。嵌挿孔１５の膚１ｉ１ｉＫ
は平行光線発生部品１１の位置決めビン１４が嵌合する
凹部１６が設けられている。平行光線発生部品１１はピ
ックアップ本体ケース１０の嵌挿孔ｌ。５に、凹部１・
と位置決めビン１４とを合せて挿入され、ビス１７によ
シビックアップ本体ケース１０のねじ孔１８に着脱可能
に取付けられる。The cylindrical case 12 has a positioning pin 14 on its outer peripheral surface. The pickup body case 10 incorporates a polarizing beam splitter 4, a quarter-wave plate 5, a focus lens 6, a lens system 8, and a photodetector 9 as shown in FIG. It has a circular insertion hole 18 into which it is inserted. Insertion hole 15 skin 1i1iK
A recess 16 is provided in which the positioning pin 14 of the parallel light generating component 11 is fitted. The parallel light generating component 11 is inserted into the insertion hole l of the pickup body case 10. 5, recess 1.
and the positioning pin 14 are inserted together and removably attached to a screw hole 18 of the civic up main body case 10 with a screw 17.
このように、半導体レーザ１とコリメートレンズ３とを
一体化して平行光線発生部品１１とし、予じめ調整する
ようにし九ので、半導体レーｆ１の交換に際して平行光
線発生部品１１ごと交換すれば、常に光軸対称の平行光
線が得られ、レーず交換後も・フォトディテクタ９上に
正しい像を結ばせることが可能となる。平行光線発生部
品１１とピツクアップ本体ケースｌＯとの周方向の位置
決めは平行光線発生部品１１の位置決め突部１４とピッ
クアップ本体ケース１０の凹部１６との嵌合により行な
われる。これにより、決められ九個光方向を持った軸対
称の平行光線をピックアップ本体ケース１０の光学系に
入射させることができる。In this way, the semiconductor laser 1 and the collimating lens 3 are integrated to form the parallel beam generating component 11, and are adjusted in advance. Therefore, if the entire parallel beam generating component 11 is replaced when replacing the semiconductor laser f1, it will always be possible to Parallel light beams that are symmetrical about the optical axis can be obtained, and even after the laser beam is replaced, it is possible to form a correct image on the photodetector 9. The circumferential positioning of the parallel beam generating component 11 and the pickup main body case 10 is performed by fitting the positioning protrusion 14 of the parallel beam generating component 11 into the recess 16 of the pickup main body case 10. Thereby, axially symmetrical parallel light beams having nine predetermined optical directions can be made to enter the optical system of the pickup main body case 10.
まえ、半導体ル−ザｌの交換に伴なって交換され、６１
１品はコリメートレンズ３だけであるから、ビックアフ
デの全体を交換する場合と比べて交換部品が少なく、安
価にレーザ交換をすることができる。Previously, it was replaced with the replacement of the semiconductor laser l, and the 61
Since one item is only the collimating lens 3, there are fewer parts to be replaced than in the case of replacing the entire big afde, and the laser can be replaced at a low cost.
第７Ｆｇ＃ｉ第５図の位置決め突部１４と凹部１６Ｃ代
わりに半導体レーず１とレーザ電源とを結ぶ丸めの端子
ビン１９とソケット２・０とを設けえもので、これを差
し込むことにより位置決めと同時に結線４行なうことが
できるようにし九ものである。その他は第１の実施例と
同様である。7Fg#i In place of the positioning protrusion 14 and recess 16C shown in FIG. This allows four wire connections to be made at the same time. The rest is the same as the first embodiment.
なお、前記各実施例は平行光線発生部品１１の外殻に円
筒形ケース１２を用いて位置決め手段を設けたが、平行
光線発生部品１１の外殻を角筒形とすれば位置決め手段
は不安である。In each of the above embodiments, the positioning means was provided using the cylindrical case 12 on the outer shell of the parallel ray generating component 11, but if the outer shell of the parallel ray generating component 11 was made into a rectangular cylinder, the positioning means would be unstable. be.
以上のように、この発明の光学式ビックアラ１ハ、半導
体レーザとコリメートレンズとを一体に組合せて平行光
線発生部品とし、この組合せ部品ごと交換を行なうよう
にしたため、次のような効果が得られる。■交換する部
品が少ないため、安価にレーザ交換をすることができる
。■ユーザ側で簡単に交換することができる。■光学系
の光軸に対して、常に軸対称の平行光線を入射させるこ
とができる。As described above, in the optical big ARA 1 of the present invention, the semiconductor laser and the collimating lens are combined into a parallel beam generating component, and this combined component is replaced as a whole, so that the following effects can be obtained. . ■Since there are few parts to be replaced, lasers can be replaced at low cost. ■Can be easily replaced by the user. (2) Parallel rays that are axially symmetrical can always be incident on the optical axis of the optical system.
第１図は従来の光学式ピアツクアップの一例を示す説明
図、第２図ないし第４図はその半導体レーザのチップの
位置の変化およびコリメートレンズの焦点距離の変化に
応じた光線の伏線を示した説明図、第５図はこの発明の
一実施例の分解斜視図、第６図はその先軸対称平行光線
発生部品の断面を示す説明図、第７図は他の実施例の分
解斜視図である。
１・・・半導体レーザ、２・・・チップ、３・・・コリ
メートレンズ、９・・・ディテクタ、１０−・・ピック
アップ本体ケース、−１１−・・光軸対称平行光線発生
部品、１２・・・円筒形ケース、１５・・・嵌挿孔、１
９°・・端子ビン、２０・・・ソケット
第１図
第４図Fig. 1 is an explanatory diagram showing an example of a conventional optical pickup, and Figs. 2 to 4 show foreshadowing of light rays according to changes in the position of the semiconductor laser chip and changes in the focal length of the collimating lens. 5 is an exploded perspective view of one embodiment of the present invention, FIG. 6 is an explanatory diagram showing a cross section of the axisymmetric parallel ray generating component, and FIG. 7 is an exploded perspective view of another embodiment. be. DESCRIPTION OF SYMBOLS 1... Semiconductor laser, 2... Chip, 3... Collimating lens, 9... Detector, 10-... Pickup body case, -11-... Optical axis symmetrical parallel beam generating component, 12...・Cylindrical case, 15...insertion hole, 1
9°...Terminal pin, 20...Socket Figure 1 Figure 4
Claims (2)
コリメートレンズとを一体に組合せてなシ前記ピックア
ップ本停ケースに着脱可能に取付けられ走光軸対称平行
光線発生部品と、前部ピックアップ本体ケースに取付け
られ九フォトディテクタと、前記ビッグアップ本体ケー
ス内に設けられて前記光軸対称平行光線発生部品で発生
した先様を記録媒体に集光しかつその反射光を前記フォ
トディテクタに結侭させる光学系とを備え九光学式ピッ
クアップ・(1) A pickup main body case, a semiconductor laser, and a collimating lens are integrally combined, a parallel light generating part that is removably attached to the pickup main stop case and is symmetrical about the optical axis, and a part that is attached to the front pickup main body case. A nine optical system comprising a photodetector and an optical system provided in the big-up main body case to condense the light generated by the optical axis symmetrical parallel light beam generating component onto a recording medium and to direct the reflected light to the photodetector. Type pickup・
Ｋ１１ｌ記半導体レーザと前記コリメートレンズとを収
めかつ前記円筒形ケースの外側にこの円筒形ケースと軸
心方向が平行になる端子ピンを設は九ものからなり、前
記ピックアップ本体ケースが前記元軸対称平行光線発生
部品の前記円筒形ケースを嵌入する嵌挿部と前記端子ビ
ンが差込まれるソケットとを有する特許請求のｍｔｓ第
（１）項記載の光学式ピックアップ。(2) The optical axis-symmetrical parallel light generating component houses the semiconductor laser described in K11l in a cylindrical case and the collimating lens, and has a terminal pin on the outside of the cylindrical case whose axial direction is parallel to this cylindrical case. MTS No. (1) of the patent claim, wherein the pickup body case has a fitting portion into which the cylindrical case of the original axially symmetrical parallel light beam generating component is fitted, and a socket into which the terminal pin is inserted. ) Optical pickup described in section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21218381A JPS58114338A (en) | 1981-12-26 | 1981-12-26 | Optical pickup |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21218381A JPS58114338A (en) | 1981-12-26 | 1981-12-26 | Optical pickup |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58114338A true JPS58114338A (en) | 1983-07-07 |
Family
ID=16618287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21218381A Pending JPS58114338A (en) | 1981-12-26 | 1981-12-26 | Optical pickup |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58114338A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6329330A (en) * | 1986-07-23 | 1988-02-08 | Canon Inc | Optical information recording and reproducing device |
| WO1993005553A1 (en) * | 1991-09-10 | 1993-03-18 | Massachusetts Institute Of Technology | Pre-aligned diode laser for external cavity operation |
| US5289485A (en) * | 1991-09-10 | 1994-02-22 | Micracor, Inc. | Multi-element optically pumped external cavity laser system |
| US5327447A (en) * | 1989-04-20 | 1994-07-05 | Massachusetts Institute Of Technology | Waveguide optical resonant cavity laser |
| US5327444A (en) * | 1989-04-20 | 1994-07-05 | Massachusetts Institute Of Technology | Solid state waveguide lasers |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS503097U (en) * | 1973-05-09 | 1975-01-13 |
-
1981
- 1981-12-26 JP JP21218381A patent/JPS58114338A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS503097U (en) * | 1973-05-09 | 1975-01-13 |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6329330A (en) * | 1986-07-23 | 1988-02-08 | Canon Inc | Optical information recording and reproducing device |
| US5327447A (en) * | 1989-04-20 | 1994-07-05 | Massachusetts Institute Of Technology | Waveguide optical resonant cavity laser |
| US5327444A (en) * | 1989-04-20 | 1994-07-05 | Massachusetts Institute Of Technology | Solid state waveguide lasers |
| WO1993005553A1 (en) * | 1991-09-10 | 1993-03-18 | Massachusetts Institute Of Technology | Pre-aligned diode laser for external cavity operation |
| US5289485A (en) * | 1991-09-10 | 1994-02-22 | Micracor, Inc. | Multi-element optically pumped external cavity laser system |
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