JPS58208943A - Optical information recording device - Google Patents
Optical information recording deviceInfo
- Publication number
- JPS58208943A JPS58208943A JP9159882A JP9159882A JPS58208943A JP S58208943 A JPS58208943 A JP S58208943A JP 9159882 A JP9159882 A JP 9159882A JP 9159882 A JP9159882 A JP 9159882A JP S58208943 A JPS58208943 A JP S58208943A
- Authority
- JP
- Japan
- Prior art keywords
- output
- disk
- record carrier
- objective lens
- focus control
- 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.)
- Granted
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
- G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
Landscapes
- Manufacturing Optical Record Carriers (AREA)
- Automatic Focus Adjustment (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は光学的に円盤状記録担体へ情報を書き込む光学
情報記録装置に関するもので、特に円盤状記録坦体上へ
配録用光ビームを集光するように動作する自動焦点制御
装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical information recording device that optically writes information onto a disc-shaped record carrier, and in particular operates to focus a recording light beam onto the disc-shaped record carrier. This invention relates to an automatic focus control device.
まず、光学的に円盤状記録坦体に情報を書込み光学情報
記録装置の従来例を第１図により説明する。First, a conventional example of an optical information recording device for optically writing information onto a disk-shaped recording medium will be explained with reference to FIG.
第１図において、円盤状記録坦体１（以下ディスクと呼
ぶ）はたとえばガラス円板のような基板１ａ上にレジス
ト２が塗布されており、モータ３によって一定回転数（
たとえば１８００ｒ ｐｍ ）で回転駆動される。In FIG. 1, a disc-shaped recording medium 1 (hereinafter referred to as a disc) has a resist 2 coated on a substrate 1a such as a glass disc, and is rotated at a constant speed by a motor 3.
For example, it is rotated at 1800 rpm).
記録レーザ４（たとえばＡｒレーザ）から放射された光
ビームＡは光変調器５．レンズ６、ミラー７．８を経て
Ｚ−↑物しンズ９へ入射し、対物レンズ９によって、デ
ィスク１上の８点に光ビームＡは集光する。しかし、デ
ィスクの傾き、ディスクのそり、ディスクの面の凹凸に
よって常にディスク面ａに焦点が結ばない。このため自
動焦点制御装置が必要となる。A light beam A emitted from a recording laser 4 (for example, an Ar laser) is transmitted to an optical modulator 5. The light beam A enters a Z-↑ object lens 9 through a lens 6 and a mirror 7.8, and is focused on eight points on the disk 1 by an objective lens 9. However, due to the inclination of the disk, the warpage of the disk, and the unevenness of the surface of the disk, the focus is not always on the disk surface a. For this reason, an automatic focus control device is required.
自動焦点制御装置は、次のように構成されている。The automatic focus control device is configured as follows.
レーザー０（たとえばＨｅ −Ｎ ｅし〜ザ）から出た
光ビームＢは中間レンズ１１．偏光ビームスプλ
リッター１２１．、／４板１３．ミラー８を経て対物レ
ンズ９に入射する。このときミラー８は光ビームＡを透
過するが、光モームＢは反射す、る特性をもっている。The light beam B emitted from the laser 0 (e.g. He-Ne laser) passes through the intermediate lens 11. Polarizing beam splitter λ ritter 121. , /4 board 13. The light passes through the mirror 8 and enters the objective lens 9. At this time, the mirror 8 has a characteristic of transmitting the light beam A, but reflecting the light beam B.
ディスク面ａで反射した光ビームＢは対物レンズ９．ミ
ラー８．’／ＪＥ１３．偏光ビームスプリッタ１２を通
って、２分割ディテクタ１４へ入射する。ディスク面の
上下動は光ビームＢの２分割ティチクター１４上で第２
図の矢印の様に方向の移動針によって現れる。２分割テ
ィチクター１４０画素子１４ａ、１４ｂの各出力は差動
アンプ１５に加えられ、その誤差信号を検出し制御回路
１６に加える。制御回路１６の出力で例えばリニアモー
タ１７を動かし対物レンズ９をディスク１に対して上下
動せしめて、常にディスク面に焦点を結ぶ様に動作する
。The light beam B reflected by the disk surface a is passed through the objective lens 9. Mirror 8. '/JE13. The light passes through the polarizing beam splitter 12 and enters the two-split detector 14 . The vertical movement of the disk surface is caused by the second division of the light beam B on the 2-split titicle 14.
It appears by the moving needle in the direction shown by the arrow in the figure. The respective outputs of the 2-divided tickctor 140 pixel elements 14a and 14b are applied to a differential amplifier 15, and the error signal thereof is detected and applied to a control circuit 16. The output of the control circuit 16 drives, for example, a linear motor 17 to move the objective lens 9 up and down with respect to the disk 1, so that the objective lens 9 is always focused on the disk surface.
一方、ディスク１０基板１ａは良好な表面研磨を行う必
要があり、また、使用済のディスクを再使用するため再
研磨を行なって使用している。この研磨によりディスク
１の基板１ａの厚みｔはディスク７により約１聰以上変
、化する。この値をリニアモータ１７ではカバー出来な
い。このため対物レンズ９を含めたリニアモータによる
駆動機構全体を十Ｆ動さぜるだめの上下動機構１８を備
えている。On the other hand, the surface of the disk 10 substrate 1a needs to be well polished, and in order to reuse a used disk, it is re-polished before use. As a result of this polishing, the thickness t of the substrate 1a of the disk 1 changes by about 1 thick or more depending on the disk 7. This value cannot be covered by the linear motor 17. For this purpose, a vertical movement mechanism 18 is provided to move the entire drive mechanism including the objective lens 9 by a linear motor by 10F.
そし、で、ディスク１の厚みｔに応じて手動で上下動１
機構１８を動かして来た。しかしこの様な装置では人が
上下動機構１８を通じてリニアモータ１７を含む焦点制
御機構全体の位置を調整するために子こりがディスク１
の上へ付着しやすい。またディスク１をモータ３に取り
付けたり、取りはずしたりするために、更に上方へ移動
した方が（たとえば２０間作度）空間があき６易となる
。こうした供に鑑み、本発明は対物レンズやりニアモー
タ等を含む焦点制御機構全体を上下動させ、焦点付近で
自動的に停止トさせることを目的としている。Then, manually move up and down 1 according to the thickness t of disk 1.
Mechanism 18 has been activated. However, in such a device, a person adjusts the position of the entire focus control mechanism including the linear motor 17 through the vertical movement mechanism 18.
Easy to adhere to. Further, in order to attach or detach the disk 1 to the motor 3, it is easier to move the disk 1 further upward (for example, by 20 degrees) to free up space. In view of these circumstances, an object of the present invention is to move the entire focus control mechanism including the objective lens, near motor, etc. up and down, and automatically stop it near the focus.
丑だ本発明ではレーザ光Ｂを便って停止位置を検出して
いるが、リニアモータ１７が上ド動機構１８によ−）で
下降させようとする時、レーザ１゜の状態が悪くなりレ
ーザ光Ｂを放射しなくなった場合、自動的にリニアモー
タ１７を上昇させ又自動焦点制御装置を１苧止させるこ
ｋを目的としている。Unfortunately, in the present invention, the stop position is detected using the laser beam B, but when the linear motor 17 is lowered by the upper drive mechanism 18), the condition of the laser 1° deteriorates. The purpose is to automatically raise the linear motor 17 and stop the automatic focus control device when the laser beam B is no longer emitted.
以トー実殉例にも−ずいて本発明を説明する。第３図は
本発明の第１の実施例の光学情報記録装置を示しており
、第１図と同一構成部品は同一符号を付して示している
。The present invention will now be explained with reference to actual examples. FIG. 3 shows an optical information recording device according to a first embodiment of the present invention, and the same components as in FIG. 1 are designated by the same reference numerals.
コントロール回路２４の出力によってモータ２６が１駆
動され上下動機構１８を介してリニアモータ１７を含む
焦点制御機構全体は上下に動くこ−とが出来る。今、コ
ントロール回路２４の出力によって焦点制御機構全体が
下降し、焦点付近に近つぐと、光ビームＢはディスク１
のレジスト２表面で反射し、対物レンズ９． ミーｙ
−ｓ、 匂板１．３．偏光ビームスプリッタ１２を通
って２分割ディテクター１４上に光ビームＢが現われる
。The motor 26 is driven once by the output of the control circuit 24, and the entire focus control mechanism including the linear motor 17 can be moved up and down via the up and down movement mechanism 18. Now, when the entire focus control mechanism is lowered by the output of the control circuit 24 and approaches the focal point, the light beam B is directed to the disk 1.
is reflected on the surface of the resist 2, and is reflected by the objective lens 9. Me y
-s, scent plate 1.3. A light beam B passes through the polarizing beam splitter 12 and appears on the two-split detector 14 .
対物レンズ９の位置が順次焦点付近に近ずくと２分割デ
ィテクター１４の各素子１４ａ、１４ｂの出力として第
４図イのＣ，Ｄの様な出力が発生する。As the position of the objective lens 9 gradually approaches the vicinity of the focal point, outputs such as C and D in FIG.
この２分割ディテクター１４の画素子１４ａ。Pixel element 14a of this two-part detector 14.
１４ｂの各出力Ｃ，ＤはコンパＶ−夕１９．２０にそれ
ぞれ加えられ第４図イに点線で示しているようなスレン
ヨルト電圧ｖｔｈ以上の正圧が出力Ｃ１Ｄに発生したと
き、各コンパレータ１９，２０より第４図口に示すよう
に出力パルスＥ、Ｆが現われる。前記出力パルスＥ、
Ｆはゲート回路２１に加えられ、第４図口のようにＥ
とＦに出力・ζルスが同時に現れると、ゲート回路２１
は出カッζルスＧ（第４図・・）を発生する。コントロ
ール回路２４はゲート回路２１の出力パルスＧを受ける
と自動的にモータ２５を停止して上下、駆動機構１８の
丁降動作が停止する。The outputs C and D of the comparators 14b and 19.20 are respectively applied to the comparators 19 and 14b. 20, output pulses E and F appear as shown in the opening of FIG. the output pulse E;
F is added to the gate circuit 21, and E
When the output and ζrus appear simultaneously at F and F, the gate circuit 21
generates an output curlus G (Fig. 4...). When the control circuit 24 receives the output pulse G from the gate circuit 21, it automatically stops the motor 25 and stops the vertical and lowering operations of the drive mechanism 18.
また、焦点制御機構全体の側面の一部に磁石２２を取り
付け、上下動機構１８を介して、この焦点制御機構全体
が所定の位置まで上昇するとホール検出器２３で４ｒＢ
力を検出し、上限位置を検出する。A magnet 22 is attached to a part of the side surface of the entire focus control mechanism, and when the entire focus control mechanism is raised to a predetermined position via the vertical movement mechanism 18, a Hall detector 23 detects 4rB.
Detects force and detects upper limit position.
ホール検出器２３からの出力・ζルスはコントロール回
路２４に加えられ、モータ２６を停止させる。The output ζ pulse from the Hall detector 23 is applied to the control circuit 24 to stop the motor 26.
この様にして上下動機構１８による焦点？！ＩＪ御機構
全機構全***置を決めている。In this way, the focus by the vertical movement mechanism 18? ! The overall position of all IJ control mechanisms is determined.
この実施例では対物レンズ９およびリニアモータ１７を
含む焦点制御機構全体が丁降して来た時、九ビームＢを
１史−・て焦点位置を恢出し７、モータ２５を自動停止
させて来たが、レーザ１０が不調となり、光ビームＢを
放射しなくなった場合、焦点位置を検出出来なくなり、
対物レンズ９がディスク１に衝突する危険が生じる。こ
の点を考慮して第６図に示す実施例では光ビームＢが対
物レンズ９に入射する前に検出して危険を防止している
。In this embodiment, when the entire focus control mechanism including the objective lens 9 and the linear motor 17 comes down, the nine beams B are moved through one cycle to find the focal position 7, and the motor 25 is automatically stopped. However, if the laser 10 malfunctions and stops emitting the light beam B, the focal position cannot be detected,
There is a risk that the objective lens 9 will collide with the disk 1. In consideration of this point, in the embodiment shown in FIG. 6, the light beam B is detected before it enters the objective lens 9 to prevent danger.
レーザ１ｏからのレーザピ〜ム光Ｂはハーフミラ−２６
によって一部が分けられ光デイテクタ−２７に入射する
。光デイテクタ−２７の出力は判別器２８に加えられる
。この判別器２８は第６図イの様ニ、レーザビーム九Ｂ
の強度が所定のスレショルド電圧Ｖより減少すると、第
６図口のように出力パルスＨｔｉ生Ｌ、このパルスＨを
コントロール回路２４に印加し、このコントロール回路
２４によってモータ２５が停止するか、上昇方向に動ど
き、磁石２２．ホール検出器２３で検出される上限位置
で停止するようになっている。Laser beam B from laser 1o is a half mirror 26
A portion of the light is separated and enters the optical detector 27. The output of the optical detector 27 is applied to a discriminator 28. This discriminator 28 has a laser beam 9B as shown in Fig. 6A.
When the intensity of the voltage decreases below a predetermined threshold voltage V, the output pulse Hti is applied to the control circuit 24 as shown at the beginning of FIG. The magnet moves 22. It is designed to stop at the upper limit position detected by the Hall detector 23.
以上のように本発明によればディスクの厚みが異ってい
ても、ディスクを対物レンズの焦点位置付近に、Ｊ１下
動機構をつかって、自動的に調整出来又人が近っかなぐ
とも出来るため、はこりの旬着が無くなるものである。As described above, according to the present invention, even if the thickness of the disk is different, the disk can be automatically adjusted to the vicinity of the focal position of the objective lens using the J1 lowering mechanism, and even if a person does not get close. Because it is possible to do so, there will be no seasonal clothing available.
第１図は従来の光学情報記録装置の基本構成を下すブＯ
−）り図、第２図は同要部の検出素子を示す平面図、第
３図は本発明の１実施例の光学情報記録装置の構成を７
Ｆすブロック図、第４図は同動作波形図、第６図は本発
明の他の実施例のブロック図、第６図は同動作説明図で
ある。
１・・・・・・円盤状記録担体、４・・・・・・記録レ
ーザ、５・・・・・・光変調器、９・・・・・・対物レ
ンズ、１ｏ・・・・・検出用レーザ、１２・・・・・・
ビームスプリッタ、１４・・・・・ ２分４１Ｊデイテ
クター、１５・・・・・・差動アンプ、１６・・・・・
・制御回路、１７・・・・・・リニアモータ、１８・・
・−・・上下動機構、１９．２０・・・・コンパレータ
、２１・・・・・−ケート回路、２４・−・・コントロ
ール回路、２６・・・・・・モータ。
＠１ 図
も１
うｒ（）
第４図
第５図
６ Ｕ：４Figure 1 shows the basic configuration of a conventional optical information recording device.
2 is a plan view showing the detection element of the same essential part, and FIG.
FIG. 4 is a waveform diagram of the same operation, FIG. 6 is a block diagram of another embodiment of the present invention, and FIG. 6 is an explanatory diagram of the same operation. DESCRIPTION OF SYMBOLS 1... Disc-shaped record carrier, 4... Recording laser, 5... Light modulator, 9... Objective lens, 1o... Detection Laser for use, 12...
Beam splitter, 14...2 minute 41J detector, 15...Differential amplifier, 16...
・Control circuit, 17...Linear motor, 18...
...Vertical movement mechanism, 19.20...Comparator, 21...-Cate circuit, 24...Control circuit, 26...Motor. @1 Figure also 1 ur() Figure 4 Figure 5 Figure 6 U:4
Claims (2)
る対物レンズと、検出用のレーザ光を前記対物レンズを
介して前記円盤状記録担体に照射し、その反射光を受光
して前記検出用レーザ光の前記円盤状記録担体上での集
光状態に応じた出力を得る第１の検出手段と、その第１
の検出手段の出力により前記対物レンズを移動せしめて
前記変調光の前記記録担体上での集光状態を制御する焦
点制御手段と、前記検出用レーザ光の反射光から前記検
出用レーザ光の前記記録担体上での集光状態が予じめ定
められた所定の範囲にあるか否かを検出する第２の検出
手段と、その第２の検出手段の出力によシ、前記対物レ
ンズを含む焦点制御手段全体を前記円盤状記録担体に離
接する方向゛に移動し、前記検出用レーザ光の前記記録
担体上での集光状態が前記子しめ定められた所定範囲内
になるよう制御するＩＪ御千手段よりなる光学情報記録
装置前。(1) An objective lens for condensing variable dimming to be recorded onto a disc-shaped record carrier; a detection laser beam is irradiated onto the disc-shaped record carrier through the objective lens; and the reflected light is received. a first detection means for obtaining an output according to a focusing state of the detection laser beam on the disk-shaped record carrier;
a focus control means for controlling the focusing state of the modulated light on the record carrier by moving the objective lens according to the output of the detection means; a second detection means for detecting whether the condensed state on the record carrier is within a predetermined range; and an output of the second detection means, including the objective lens. an IJ for controlling the focusing state of the detection laser beam on the record carrier to be within the predetermined range by moving the entire focus control means in a direction toward and away from the disk-shaped record carrier; In front of the optical information recording device consisting of thousands of means.
光する２分割ディテクターよりなり、その２分割ディチ
クタルを構成する２素子の差出力より検出するよう構成
され、第２の検出手段は、前記２素子の各出力がそれぞ
れ所定の出カレベル内ニあるか否かを検出するよう構成
されていることを特徴とする特許請求の範囲第１項に記
載の光学情報記録装置。 に）検出用レーザ光の出力レベルを検出し、その出力レ
ベルが所定のレベル以下になったことを検出して、制御
手段を制御して焦点制御手段全体の駆動を停止すること
を特徴とする特許請求の範囲第１項に記載の光学情報記
録装置。(2) The first detection means is composed of a two-split detector that receives reflected light of the detection laser beam, and is configured to detect from the difference output of two elements constituting the two-split detector. 2. The optical information recording apparatus according to claim 1, wherein the optical information recording apparatus is configured to detect whether each output of the two elements is within a predetermined output level. B) Detecting the output level of the detection laser beam, and detecting that the output level has become below a predetermined level, controls the control means to stop driving the entire focus control means. An optical information recording device according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9159882A JPS58208943A (en) | 1982-05-28 | 1982-05-28 | Optical information recording device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9159882A JPS58208943A (en) | 1982-05-28 | 1982-05-28 | Optical information recording device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58208943A true JPS58208943A (en) | 1983-12-05 |
| JPH0479071B2 JPH0479071B2 (en) | 1992-12-14 |
Family
ID=14030989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9159882A Granted JPS58208943A (en) | 1982-05-28 | 1982-05-28 | Optical information recording device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58208943A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0260637A2 (en) * | 1986-09-16 | 1988-03-23 | Matsushita Electric Industrial Co., Ltd. | Optical information recording/reproducing apparatus |
| JPS6435729A (en) * | 1987-07-31 | 1989-02-06 | Canon Kk | Automatic focussing controller |
| EP1612262A1 (en) * | 2003-04-09 | 2006-01-04 | Olympus Corporation | Culture treating device and automatic culture treating device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56148743A (en) * | 1980-04-16 | 1981-11-18 | Mitsubishi Electric Corp | Focus control device |
-
1982
- 1982-05-28 JP JP9159882A patent/JPS58208943A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56148743A (en) * | 1980-04-16 | 1981-11-18 | Mitsubishi Electric Corp | Focus control device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0260637A2 (en) * | 1986-09-16 | 1988-03-23 | Matsushita Electric Industrial Co., Ltd. | Optical information recording/reproducing apparatus |
| JPS6435729A (en) * | 1987-07-31 | 1989-02-06 | Canon Kk | Automatic focussing controller |
| EP1612262A1 (en) * | 2003-04-09 | 2006-01-04 | Olympus Corporation | Culture treating device and automatic culture treating device |
| EP1612262A4 (en) * | 2003-04-09 | 2009-07-22 | Olympus Corp | Culture treating device and automatic culture treating device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0479071B2 (en) | 1992-12-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3974327A (en) | Autofocus circuit for a videodisc playback device | |
| US4750163A (en) | Pick-up head abnormality detector for optical recording/reproducing apparatus | |
| JP2574765B2 (en) | Magneto-optical disk device | |
| US4542491A (en) | Optical information disc apparatus with autofocusing servo system | |
| JPH02101637A (en) | Optical information recording and reproducing device | |
| US4633338A (en) | Magneto-optical recording and reproducing apparatus having a magnetization direction detecting apparatus for a magnetic recording medium | |
| EP1154412A1 (en) | Optical disk device | |
| JPH01220129A (en) | Focus catcher | |
| JPH0612673A (en) | Optical disk device | |
| JPS58208943A (en) | Optical information recording device | |
| JPH0316691B2 (en) | ||
| EP0326343A2 (en) | Optical information recording apparatus | |
| JP2619372B2 (en) | Magneto-optical recording method | |
| JPH05182224A (en) | Optical disk device | |
| JPS6245297Y2 (en) | ||
| JPS61196446A (en) | Photomagnetic recording device | |
| JPH0736228B2 (en) | Automatic focus pull-in control device | |
| JPH01155504A (en) | Controller for external magnetic field of magneto-optical disk device | |
| JPS61242338A (en) | Optical information recording and reproducing device | |
| JPS6217287B2 (en) | ||
| JPH01100737A (en) | Optical disk recording and reproducing device | |
| JP2784835B2 (en) | Optical information recording / reproducing device | |
| JPH0266728A (en) | Optical information recording and reproducing device | |
| JPH0721864B2 (en) | Optical information recording device | |
| JPS61242337A (en) | Optical information recording and reproducing device |