JPS60115030A - Information recorder - Google Patents
Information recorderInfo
- Publication number
- JPS60115030A JPS60115030A JP58222076A JP22207683A JPS60115030A JP S60115030 A JPS60115030 A JP S60115030A JP 58222076 A JP58222076 A JP 58222076A JP 22207683 A JP22207683 A JP 22207683A JP S60115030 A JPS60115030 A JP S60115030A
- Authority
- JP
- Japan
- Prior art keywords
- track
- frequency
- recording
- spot
- disk
- 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
- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/02—Editing, e.g. varying the order of information signals recorded on, or reproduced from, 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
- G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
- G11B7/0037—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with discs
-
- 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
- G11B7/0901—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 for track following only
-
- 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
- G11B7/0938—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 servo format, e.g. guide tracks, pilot signals
-
- 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
- G11B7/095—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 specially adapted for discs, e.g. for compensation of eccentricity or wobble
- G11B7/0953—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 specially adapted for discs, e.g. for compensation of eccentricity or wobble to compensate for eccentricity of the disc or disc tracks
-
- 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
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
Landscapes
- Optical Recording Or Reproduction (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Moving Of The Head To Find And Align With The Track (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は情報記録装置、特に光データファイル、光ビデ
オディスク、光オーディオディスク等の情報記録装置に
関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an information recording device, and particularly to an information recording device such as an optical data file, an optical video disc, an optical audio disc, etc.
光データファイル、光ビデオディスク、光オーディオデ
ィスク等の光ディスクの記録において、追加記録（Ａｄ
ｄ−ｏｎ記録）を行ないたい場合、既に記録されている
トラックとの間隔を正確に一定に保ちながら記録する必
要がある。特に、ディスクの一部に数トラツクを記録し
た後、一旦ディスクをはずし。When recording optical discs such as optical data files, optical video discs, and optical audio discs, additional recording (Ad
When it is desired to perform d-on recording, it is necessary to record while keeping the distance from the already recorded track accurately constant. In particular, after recording several tracks on a part of the disc, remove the disc.
改めてＡ ｄ ｄ −ｏ ｎ記録を行ないたい場合があ
る。There are cases where it is desired to perform add-on recording again.
このときディスクの偏心量は通常１００μｍもあり、ト
ラックピッチが約１．６μｍであるところから、新たに
Ａ ｄ ｄ −ｏ ｎ記録したトラックは既に記録しで
あるトラックの何十本をクロスしてしまうことになり、
正確な記録は不可能となる。At this time, the eccentricity of the disk is usually 100 μm, and the track pitch is about 1.6 μm, so the newly recorded track crosses dozens of previously recorded tracks. I ended up putting it away,
Accurate recording becomes impossible.
従来、かかる目的の記録（書き込み）・再生方式として
、２本のレーザビームを形成し、一方を既に記録されて
いる記録トラック（既記能トラック）の追跡（再生）に
用い、他方を記録に使用することにより、追加書き込み
を行う方式が考えられている（特開昭５６−１２４４）
、第１図に、従来の追加書き込み可能な記録再生装置の
主要部の説明図を示す、１０工および１０２はそれぞれ
記録用および再生用レーザビームである。情報トラック
の記録は、レーザビーム１０１を光度調１１１Ｑ３．ビ
ームスプリッタ１０４、振動ミラー１０５、対物レンズ
１０６を経て記録媒体１０７上に集光して行う。Conventionally, as a recording (writing)/reproducing method for this purpose, two laser beams are formed, one is used for tracking (reproducing) a recording track that has already been recorded (recorded track), and the other is used for recording. A method has been considered in which additional writing can be performed by using
FIG. 1 shows an explanatory diagram of the main parts of a conventional additionally writable recording and reproducing apparatus. Reference numerals 10 and 102 are recording and reproducing laser beams, respectively. To record the information track, the laser beam 101 is set to light intensity 111Q3. The light is focused onto a recording medium 107 through a beam splitter 104, a vibrating mirror 105, and an objective lens 106.
一方、再生用レーザビーム１０２はビームスプリッタ１
０８、ミラー１０９、ビームスプリッタ１０４、振動ミ
ラー１０５．対物レンズ１０６を経て記録媒体１０７上
の既記録トラック上に集光される。On the other hand, the reproduction laser beam 102 is transmitted to the beam splitter 1
08, mirror 109, beam splitter 104, vibrating mirror 105. The light passes through the objective lens 106 and is focused onto a recorded track on the recording medium 107 .
既記録トラックからの反射光は、対物レンズ１０６、振
動ミラー１０５、ビームスプリッタ１０４、ミラー１０
９、ビームスプリッタ１０８を経て光検出器１００に照
射し、トラックとレーザビームとのずれ情報を有するエ
ラー信号を得る。この信号を振動ミラー１０５のドライ
バ１１０に入力し、振動ミラー１０５を動かして、再生
用レーザビーム１０２が既記録トラックを正確に追跡す
るように調整する。The reflected light from the recorded track passes through the objective lens 106, the vibrating mirror 105, the beam splitter 104, and the mirror 10.
9. The laser beam is irradiated onto the photodetector 100 through the beam splitter 108 to obtain an error signal having information on the deviation between the track and the laser beam. This signal is input to the driver 110 of the vibrating mirror 105, and the vibrating mirror 105 is moved to adjust the reproduction laser beam 102 to accurately track the recorded track.
同時に、記録用レーザビーム１０１も振動ミラー１０５
により偏向する。このようにして、記録用レーザビーム
１０１は記録媒体１０７上で、既記録トラックから一定
距離だけ離れた位置をたどることが可能となり、追加書
き込み記録が可能となる。At the same time, the recording laser beam 101 is also
deflected by In this way, the recording laser beam 101 can trace a position on the recording medium 107 that is a certain distance away from the already recorded track, making it possible to perform additional writing and recording.
しかしながら、上記の追加記録では、レーザビーム１０
１と１０２は別々の光学系を経て記録媒体１０７上に集
光されるため、１０７上において２つのビームスポット
が一定距離を安定して保つことは非常に困難であり、個
々の光学系のわずかな位置ずれにより、両者の距離が変
動する。また、実質的に両者の距離を測定することは不
可能であり、トラック間隔が変動し、両者が重なること
すら生じうる。However, in the additional recording above, the laser beam 10
1 and 102 are focused on the recording medium 107 through separate optical systems, so it is very difficult to stably maintain a constant distance between the two beam spots on 107. The distance between the two changes due to the positional shift. Furthermore, it is virtually impossible to measure the distance between the two, and the track spacing may vary, and the two may even overlap.
かかる点に鑑み、本発明は、偏心量等の影響を除去し、
トラック間隔を正確に一定に保ちながら次ぎつぎにトラ
ックを書き込む装置を提供するものである。In view of this, the present invention eliminates the influence of eccentricity, etc.
To provide a device for writing tracks one after another while keeping the track spacing accurately constant.
かかる目的を達成するために、本発明では１本の光ビー
ムから光偏向器により、記録光ビームと再生光ビームと
を作成し、これらを同一のしぼりこみ用対物レンズに入
射させ、２つのビームスポットがディスク上で半径方向
に所望のトラック間隔の整数倍だけ離れるように制御さ
せ、再生光ビームスポットであらかじめ記録されている
既記録基準トラックの中心に位置するようトラッキング
し、もう１本の記録用ビームで偏向器を使って等ピッチ
でデータの記録を逐次行なう。In order to achieve this object, in the present invention, a recording light beam and a reproduction light beam are created from one light beam using an optical deflector, and these are made incident on the same narrowing objective lens, thereby forming two beams. The spots are controlled so that they are separated by an integer multiple of the desired track spacing in the radial direction on the disc, and the reproduction light beam spot is tracked so that it is located at the center of the pre-recorded reference track, and another recording is performed. Data is recorded sequentially at an equal pitch using a beam deflector.
以下、本発明を実施例によって説明する。 Hereinafter, the present invention will be explained by examples.
第２図は、本発明を説明するための装置の構成を示す図
である０図において光源２は信号源１によって変調され
、変調光ビームは光学系に供給される。光源としては例
えば半導体レーザが用いられる。変調光ビームはカップ
リング光学レンズ３によって平行ビームに変換され、光
偏向器４、ビーム形状整形光学系２３、対物レンズ５、
を経て回折波収束ビーム６．７となり、ディスク１０面
上に微小な光スポット８．９を形成する。対物レンズ５
はディスク面上に微小な光スポツト形成の為とその光ス
ポットがトラックの中心に位置するためとに２次元的に
動くアクチュエータ２２に取り付けられている。収束ビ
ーム６は光偏向器４による可変周波数回折波であり、光
スポット８はその可変周波数回折波６の光スポットであ
る。収束ビーム７は光偏向器４による基準周波数回折波
であり、スポット９はその基準周波数回折波７の光スポ
ットである。FIG. 2 is a diagram showing the configuration of an apparatus for explaining the present invention. In FIG. 0, a light source 2 is modulated by a signal source 1, and the modulated light beam is supplied to an optical system. For example, a semiconductor laser is used as the light source. The modulated light beam is converted into a parallel beam by the coupling optical lens 3, and is then converted into a parallel beam by the optical deflector 4, the beam shape shaping optical system 23, the objective lens 5,
The diffracted wave becomes a convergent beam 6.7, and forms a minute optical spot 8.9 on the surface of the disk 10. Objective lens 5
is attached to an actuator 22 that moves two-dimensionally to form a minute optical spot on the disk surface and to position the optical spot at the center of the track. The convergent beam 6 is a variable frequency diffracted wave produced by the optical deflector 4, and the optical spot 8 is the optical spot of the variable frequency diffracted wave 6. The convergent beam 7 is a reference frequency diffracted wave by the optical deflector 4, and the spot 9 is a light spot of the reference frequency diffracted wave 7.
次に第３図に図示されているように、光スポット８．９
が既記録基準トラック１１°との間隔を正確に一定に保
ちながら、新たに逐次データトラック１１１゜１１３．
１１３．１１４、・・・ｘｘ３０を等ピッチで記録する
ための方法を次に述べる。Next, as shown in FIG.
new data tracks 111°, 113, .
A method for recording 113, 114, . . . xx30 at equal pitches will be described below.
基準周波数発振器１５と周波数可変発振器１６の出力信
号は加算器１７によって加算され、この加算信号１８は
増幅回路１９によって増幅される。この信号１２は光偏
向器４に入力される。基準周波数発振器１５は定電圧電
源２５と電圧・周波数変換回路２６から構成されている
。可変周波数発振器Ｗ１１６は可変微小電圧発生器２７
．加算回路２８および電圧・周波数変換回路２６から構
成されている。The output signals of the reference frequency oscillator 15 and the variable frequency oscillator 16 are added by an adder 17, and this added signal 18 is amplified by an amplifier circuit 19. This signal 12 is input to the optical deflector 4. The reference frequency oscillator 15 is composed of a constant voltage power supply 25 and a voltage/frequency conversion circuit 26. The variable frequency oscillator W116 is the variable minute voltage generator 27
．． It is composed of an adder circuit 28 and a voltage/frequency conversion circuit 26.
例えば光偏向器として音響−光学偏向器（Ａ１０光偏向
器）を用いることができる。Ａ１０偏向器の入力信号と
して周波数νを入力すると光ビームは角度θだけ偏向さ
れる。いまＡ１０偏向器への入力として周波数可変発振
器１６からの出力を考え、その波形を第４図（ａ）、（
ｂ）に示すよう三角波形あるいは階段波形とすｒここで
第４図（・）は同心円トラック、第４図（ｂ）はらせん
トラックの記録に対応する。以下では第４図（ａ）の同
心円トラック記録について述べる。光ビームの偏向角度
はθ（ｔ）＝（ダ。＋Δヤ（ｔ） ） ・α・・・・・
・・・・（１）α＝λ／ Ｖ ｓ
ここでν。は基準周波数、Δν（１）は可変周波数であ
る。さらにλはレーザ波長、Ｖｓは超音波速度である。For example, an acousto-optic deflector (A10 optical deflector) can be used as the optical deflector. When a frequency ν is input as an input signal to the A10 deflector, the light beam is deflected by an angle θ. Now consider the output from the variable frequency oscillator 16 as the input to the A10 deflector, and its waveform is shown in Fig. 4(a), (
A triangular waveform or a staircase waveform is used as shown in b), where FIG. 4(.) corresponds to concentric track recording, and FIG. 4(b) corresponds to recording of a spiral track. The concentric track recording shown in FIG. 4(a) will be described below. The deflection angle of the light beam is θ(t)=(da.+Δya(t)) ・α・・・・・・
...(1) α=λ/V s where ν. is the reference frequency and Δν(1) is the variable frequency. Furthermore, λ is the laser wavelength and Vs is the ultrasonic velocity.
このようにするとディスク１０に２個の微小な周波数可
変発振器１６による可変周波数回折波６、光スポット８
と基準周波数発振器１５による基準周波数回折波７、光
スポット９が形成される。可変周波数回折波６による光
スポット８は周波数可変発振器１６の周波数を変化させ
ることによって、後述するように一定のトラックピッチ
間隔、例えば１．６μｍ間隔でディスク半径方向に偏向
され情報を記録するのに用いられる。一方基準周波数回
折波７による光スポット９は発振器１６の周波数が変化
してもディスク面上で動かない。このためこの基準周波
数回折波７の光スポット９はディスク１０上にすでに記
録されている第３図の既記録基準トラック１１゜を常に
追跡するのに用いられる。基準周波数回折波７の光スポ
ット９はｒｅａｄモード、可変周波数回折波６の光スポ
ット８はＷｒｉｔｅモードで用いられるため光スポット
８のレーザ強度は光スッポット９より十分大きくしてお
く必要があり、これは周波数可変発振器１６の出力振幅
を基準周波数発振器１５のそれより大きくすることによ
り実現できる。回折波７の光スポット９の既記録基準ト
ラック１１゜からの反射回折光は光検出器１３で受光さ
れ、トラッキング制御回路１４からトラッキング誤差信
号２０を得ることができる。このトラッキング制御方法
については特開昭４９−６０７０２号、特公昭５６−３
０６１０号公報によって公知である。このトラッキング
誤差信号２０を駆動回路２１に入力し例えばレンズ５に
取付けられたアクチュエータ２２を駆動させ、レンズ５
を駆動させると基準周波数回折波７の光スポット９は、
既基準記録トラック１１°の上を追跡することになる。In this way, the variable frequency diffraction wave 6 generated by the two minute variable frequency oscillators 16 and the optical spot 8 are generated on the disk 10.
A reference frequency diffracted wave 7 and a light spot 9 are formed by the reference frequency oscillator 15. By changing the frequency of the variable frequency oscillator 16, the light spot 8 generated by the variable frequency diffraction wave 6 is deflected in the disk radial direction at a constant track pitch interval, for example, 1.6 μm, as described later, to record information. used. On the other hand, the optical spot 9 caused by the reference frequency diffraction wave 7 does not move on the disk surface even if the frequency of the oscillator 16 changes. Therefore, the light spot 9 of this reference frequency diffraction wave 7 is used to constantly track the recorded reference track 11° shown in FIG. 3, which has already been recorded on the disk 10. Since the light spot 9 of the reference frequency diffraction wave 7 is used in the read mode and the light spot 8 of the variable frequency diffraction wave 6 is used in the write mode, the laser intensity of the light spot 8 needs to be sufficiently higher than that of the light spot 9. can be realized by making the output amplitude of the variable frequency oscillator 16 larger than that of the reference frequency oscillator 15. The diffracted light reflected from the recorded reference track 11° of the optical spot 9 of the diffracted wave 7 is received by the photodetector 13, and a tracking error signal 20 can be obtained from the tracking control circuit 14. This tracking control method is described in Japanese Patent Application Laid-open No. 49-60702 and Japanese Patent Publication No. 56-3.
It is known from the publication No. 0610. This tracking error signal 20 is input to a drive circuit 21 to drive an actuator 22 attached to the lens 5, for example, and
When driven, the light spot 9 of the reference frequency diffraction wave 7 becomes
Tracking is performed above the standard recording track 11°.
このときの基準周波数回折波７の光スポット９及び可変
周波数回折波６の光スポット８のディスク面での位ＩＰ
ｏ（ｔ）＋ Ｐ （ｔ）はそれぞれ次式で表される。At this time, the position IP of the optical spot 9 of the reference frequency diffraction wave 7 and the optical spot 8 of the variable frequency diffraction wave 6 on the disk surface
o(t)+P(t) are each expressed by the following formula.
Ｐ ” （ｔ） ＝ δ（１） ・・・・・・・・・・
・・・・・・（２）Ｐ （ｔ）＝α・ｆ・Δν＋δ（１
） ・・・・（３）ここで、δ（１）は外乱やディスク
偏心などによるトラッキング誤差信号あるいは定電圧源
２５の電圧変動、ｆは対物レンズ５の焦点距離に相当す
る。P” (t) = δ(1) ・・・・・・・・・・・・
・・・・・・(2) P (t)=α・f・Δν+δ(1
)...(3) Here, δ(1) corresponds to a tracking error signal or voltage fluctuation of the constant voltage source 25 due to disturbance or disk eccentricity, and f corresponds to the focal length of the objective lens 5.
以下にこのトラッキング状態を保持しながらディスク１
０に新しくトラック１１１．１１”、１１”・・・に信
号を記録する場合の信号Δν（１）についてのべる。Disk 1 while maintaining this tracking state is shown below.
The following describes the signal Δν(1) when a signal is newly recorded on tracks 111, 11'', 11'', etc.
（２）、（３）式の差をとると
Ｐ （ｔ）−Ｐ’（ｔ） ＝ ａ ・ｆ ・Ａ ｖ （
ｔ） ・・・・（４）となる、すなわち光スポット９と
８との間隔はディスク偏心誤差あるいは定電圧源２５の
電圧変動δ（１）の影響を受けないで一定に保持される
。以ヒの説明を具体的に示すと次のようになる。いま、
可変周波数回折波６の光スポット８を１μｍ移動させる
には、対物レンズ５の焦点距離をｆ＝４−とすると４
ｗａ Ｘ 八 〇 ＝ １ μｍ
、°、Δθ＝ ０ 、２５ｍ ｒａｄｉａｎ＝２．５Ｘ
１０−’ ｒａｄｉａｎ可変局波数回折波６の光ビーム
を０．２５＊ ｒａｄｉａｎ偏向する必要がある。Taking the difference between equations (2) and (3), we get P (t)-P'(t) = a ・f ・A v (
t) ...(4), that is, the distance between the optical spots 9 and 8 is maintained constant without being affected by the disc eccentricity error or the voltage fluctuation δ(1) of the constant voltage source 25. The detailed explanation is as follows. now,
In order to move the light spot 8 of the variable frequency diffraction wave 6 by 1 μm, if the focal length of the objective lens 5 is f=4−, then 4
wa x 80 = 1 μm, °, Δθ = 0, 25m radian = 2.5X
It is necessary to deflect the light beam of the 10-' radian variable station wave number diffracted wave 6 by 0.25* radian.
光ビームの波長をλ、超音波の速度をＶｓとするとＡ１
０偏向橢における周波数の変化ΔνＳは次式で与えられ
る。（但し、Ａ１０偏向器としてテルルオキサイドＴｏ
ｏ、を用いる）
Ｖｓ
ΔνＳ＝Δθ・□
λ
ここで、Δθ＝ ２．５ Ｘ １０ ｒａｄｉａｎλ＝
０．８ Ｘ １０−４■
Ｖ ｓ ＝０．６５Ｘ１０’■／ｓａｃを代入すると
Δｙｓ＝０．２ＭＨｚ
となる。すなわち可変周波数回折波６の光スポット８を
ディスク面上で１μｍ移動させるには０．２ＭＨｚの周
波数変化が必要である。（モリブデン酸鉛を用いる場合
Ｖｓ＝３．６Ｘ１０ ’ ｍｍ／ｓｅＣでありΔシｓ：
ＩＭＨとなる。）
従って光スポット８．９の間隔を例えばトラックピッチ
１．６μｍの整数倍、すなわち、１．６Ｘｎ（ｎ＝１．
２． ・・・Ｎ）ｐｍとするには、第２図、第４図にお
いてディスク１回転毎（Δを時間毎）に発振器１６の可
変周波数を
δｖ ＝ ｖ −ｖ ’ ＝０．３ ＭＨｚ （＝０．
２Ｘ１．６）−・（５）ずつ変化させればよい、Ａｄｄ
−ｏｎするトラックを１００本とすると（５）式にてΔ
ｙ （ｔ）の最大値は
ｍ ａ Ｘ Δｖ ＝ ３０ ＭＨｚ （＝０．３ Ｘ
１００）となる。従って発振器１６の可変周波数をト
ラックピッチ１．６μｍに相当する周波数だけディスク
がし回転する毎に変化させていくと、基準周波数回折波
７の光スポット９は常に既基準記録トラック１１″を追
跡する為のトラッキングエラー信号を出してレンズアク
チュエータを駆動して、その結果基準周波数回折波７の
光スポット９は常に基準トラック上を追跡し、一方、デ
ータ記録に用いられる可変周波数回折波６はディスク１
回転毎にトランクピッチ１．６゛ μｍに相当する分だ
け偏向され、光スポット８によって常に一定のトラック
ピッチを保ってデータは記録されていく、既基準記録ト
ラック１１°の構造を第５ＦＭに示す、第５図において
既基準記録トラック１１１′は光スポット９がトラック
追跡するための情報、既基準記録トラック１１６を識別
するためのアドレス情報３０、既基準記録トラック１１
°の一周を例えば６４個のセクター３０１．３０２、・
・・、３６４に分割させ、その各セクターを指定するた
めのセクターアドレス３１、さらにトラック１１１．１
１″・・・に情報を記録する際に必要な同期信号３２等
が記録されており既基準記録トラック１１″上に記録さ
れている同期信号をベースにしてトラック１１１．１１
１・・に情報が記録されていく。′１本の既基準記録ト
ラック１１’に対してＡｄｄ−ｏｎできるトラック本数
はＡ１０偏向器の性能によって決まる。Δヤは通常５０
Ｍ Ｈｚは十分達成でき、したがって３０ Ｍ Ｈｚ
に相当する記録トラック１００本は十分実現できる０例
えばサーボライタで３０本毎に（トラックピッチを１．
６μｍとすると４８μｍ毎）予め既基準記録トラック１
１’を１本配しておく、サーボライトする時間は１８０
０ｐｐｍの直径３０ｃｍのディスクでは３０分かかるが
本発明ではその１／３０になり、１枚当たり１分径度で
出来るようになりインパクトは大きい。If the wavelength of the light beam is λ and the speed of the ultrasonic wave is Vs, then A1
The change in frequency ΔνS at zero deflection is given by the following equation. (However, as an A10 deflector, tellurium oxide To
o, is used) Vs ΔνS=Δθ・□ λ Here, Δθ= 2.5 X 10 radianλ=
By substituting 0.8 x 10-4 V s =0.65 x 10'/sac, Δys=0.2 MHz. That is, in order to move the optical spot 8 of the variable frequency diffraction wave 6 by 1 μm on the disk surface, a frequency change of 0.2 MHz is required. (When using lead molybdate, Vs = 3.6X10' mm/sec and Δs:
Becomes IMH. ) Therefore, the interval between the light spots 8.9 should be set to, for example, an integral multiple of the track pitch of 1.6 μm, that is, 1.6Xn (n=1.
2. ...N) pm, the variable frequency of the oscillator 16 is set to δv = v - v ' = 0.3 MHz (=0 ．．
Just change it by 2X1.6)-(5), Add
-If the number of tracks to be turned on is 100, then in equation (5), Δ
The maximum value of y (t) is m a X Δv = 30 MHz (=0.3
100). Therefore, if the variable frequency of the oscillator 16 is changed by a frequency corresponding to a track pitch of 1.6 μm each time the disk rotates, the light spot 9 of the reference frequency diffraction wave 7 will always track the existing reference recording track 11''. As a result, the optical spot 9 of the reference frequency diffraction wave 7 always tracks on the reference track, while the variable frequency diffraction wave 6 used for data recording is driven on the disk 1.
The 5th FM shows the structure of the standard recording track 11°, which is deflected by an amount corresponding to the trunk pitch of 1.6 μm each time it rotates, and data is recorded with the optical spot 8 always maintaining a constant track pitch. , in FIG. 5, the reference recording track 111' includes information for tracking the optical spot 9, address information 30 for identifying the reference recording track 116, and reference recording track 11.
For example, 64 sectors 301, 302, ・
..., sector address 31 for specifying each sector, and track 111.1.
Tracks 111 and 11 are recorded with synchronization signals 32 and the like necessary for recording information on tracks 11'' and 11'' based on the synchronization signals recorded on the standard recording track 11''.
Information is recorded in 1... The number of tracks that can be added on to 'one standard recording track 11' is determined by the performance of the A10 deflector. ΔYa is usually 50
MHz is well achievable and therefore 30 MHz
For example, 100 recording tracks corresponding to
(If 6 μm, every 48 μm) Preliminary standard recording track 1
Place one 1', servo write time is 180
It takes 30 minutes for a disk with a diameter of 30 cm at 0 ppm, but in the present invention, it takes 1/30 of that time, and it can be done in 1 minute diameter per disk, which has a great impact.
なおここで光偏向器としてＡ１０偏向器を用いた実例を
示したが、本発明はＡ１０以外に第６図に示すごとく回
転する透過型グレイティング２９を用い、そのグレイテ
ィングの回転角を第４図（ａ）、（ｂ）に示すように変
化させて実現できる。この場合第４図の縦軸Δνは回転
角に相当する。Although an example in which an A10 deflector is used as the optical deflector is shown here, the present invention uses a rotating transmission type grating 29 as shown in FIG. 6 in addition to the A10, and the rotation angle of the grating is It can be realized by changing it as shown in Figures (a) and (b). In this case, the vertical axis Δν in FIG. 4 corresponds to the rotation angle.
以上述べたごとく、本発明によればＡ１０偏向器を用い
ることにより１本の光ビームで追加記録を確実に行なう
ことが可能となる。As described above, according to the present invention, by using the A10 deflector, it is possible to reliably perform additional recording with a single light beam.
第１図は、従来装置を説明するための図、第２図は、本
発明の一実施例の装置構成を示す図、第３図は、本発明
のディスクの構成図、第４図は本発明の可変周波数波形
の構成図、第５図は、本発明の既記録基準トラックを説
明するための図、第６図は本発明の光偏向器のもう１つ
の実施例を説明する為の図である。
記号の説明
１・・・信号源、２・・・光源、３・・・カップリング
レンズ、４・・・光偏向器、５・・・対物レンズ、６・
・・周波数可変回折波、７・・・基準周波数回折波、８
．９・・・光スポット、１０・・・ディスク、１１１′
・・・基準トラック、１１”、１１″・・・データトラ
ック、１２・・・光偏向器入力信号、１３・・・光検出
器、１４・・・トラッキング回路、１５・・・基準周波
数発振器、１６・・・周波数可変発振器、１７・・・加
算器、１８・・・Ａ’１０入カ信号、１９・・・Ａ１０
ドライバ、２０・・・トラッキングエラー信号、２１・
・・ドライバ、２２・・・アクチュエータ、２３・・・
光学系、２４・・・プリズム、２５・・・定電圧源、２
６・・・電圧・周波数変換器、２７・・・可変微小電圧
源、２８・・・加算回路、２９・・・透過型グレイティ
ング、３ｏ・・・トラックアドレス、３１・・・セクタ
アドレス、３２・・・同期信号、３第 ３１７
第４１刀（Ｏ−）
時ｌ
詰４−図（ｂ）
Δρ
時 間
名５ 図FIG. 1 is a diagram for explaining a conventional device, FIG. 2 is a diagram showing the device configuration of an embodiment of the present invention, FIG. 3 is a configuration diagram of a disk of the present invention, and FIG. 4 is a diagram of the present invention. A configuration diagram of a variable frequency waveform of the invention, FIG. 5 is a diagram for explaining the recorded reference track of the invention, and FIG. 6 is a diagram for explaining another embodiment of the optical deflector of the invention. It is. Explanation of symbols 1... Signal source, 2... Light source, 3... Coupling lens, 4... Optical deflector, 5... Objective lens, 6...
... Frequency variable diffraction wave, 7... Reference frequency diffraction wave, 8
．． 9... Light spot, 10... Disk, 111'
...Reference track, 11", 11"...Data track, 12...Optical deflector input signal, 13...Photodetector, 14...Tracking circuit, 15...Reference frequency oscillator, 16... Frequency variable oscillator, 17... Adder, 18... A'10 input signal, 19... A10
Driver, 20...Tracking error signal, 21.
...Driver, 22...Actuator, 23...
Optical system, 24... Prism, 25... Constant voltage source, 2
6... Voltage/frequency converter, 27... Variable minute voltage source, 28... Adder circuit, 29... Transparent grating, 3o... Track address, 31... Sector address, 32 ...Synchronization signal, 3rd 317th 41st sword (O-) Time l Tsume 4-Figure (b) Δρ Time name 5 Figure
Claims (1)
器と、この偏向器からの出力光を所定記録媒体に収束さ
せる収束レンズと、上記再生光ビームを、あらかじめ記
録されている既記能基準ガイドトラックをトラッキング
追跡させるトラッキング手段とからなり、上記再生光ビ
ームの既記能基準トラックの追跡に従って等ピッッチで
上記記録ビームを上記媒体上で移動させることを特徴と
する情報記録装置。1. An optical deflector from which the recording light beam and the reproduction light beam are emitted, a converging lens that converges the output light from this deflector onto a predetermined recording medium, and a pre-recorded recording medium for the reproduction light beam. 1. An information recording apparatus comprising: a tracking means for tracking a performance reference guide track, the recording beam being moved on the medium at an equal pitch in accordance with the tracking of the recorded performance reference track of the reproduction light beam.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58222076A JPS60115030A (en) | 1983-11-28 | 1983-11-28 | Information recorder |
| US06/674,672 US4703408A (en) | 1983-11-28 | 1984-11-26 | Apparatus and record carrier for optically writing information |
| DE8484114332T DE3485175D1 (en) | 1983-11-28 | 1984-11-27 | DEVICE FOR THE OPTICAL RECORDING OF INFORMATION. |
| EP84114332A EP0144058B1 (en) | 1983-11-28 | 1984-11-27 | Apparatus for optically writing information |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58222076A JPS60115030A (en) | 1983-11-28 | 1983-11-28 | Information recorder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60115030A true JPS60115030A (en) | 1985-06-21 |
Family
ID=16776740
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58222076A Pending JPS60115030A (en) | 1983-11-28 | 1983-11-28 | Information recorder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60115030A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6376117A (en) * | 1986-09-15 | 1988-04-06 | インタ−ナショナル・ビジネス・マシ−ンズ・コ−ポレ−ション | Optical disc access apparatus |
-
1983
- 1983-11-28 JP JP58222076A patent/JPS60115030A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6376117A (en) * | 1986-09-15 | 1988-04-06 | インタ−ナショナル・ビジネス・マシ−ンズ・コ−ポレ−ション | Optical disc access apparatus |
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