JPS58108041A - Optical information recording and reproducing device - Google Patents
Optical information recording and reproducing deviceInfo
- Publication number
- JPS58108041A JPS58108041A JP20848581A JP20848581A JPS58108041A JP S58108041 A JPS58108041 A JP S58108041A JP 20848581 A JP20848581 A JP 20848581A JP 20848581 A JP20848581 A JP 20848581A JP S58108041 A JPS58108041 A JP S58108041A
- Authority
- JP
- Japan
- Prior art keywords
- recording
- bit string
- recording bit
- reproducing
- reproducing means
- 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
- G11B7/085—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
- Optical Recording Or Reproduction (AREA)
Abstract
Description
【発明の詳細な説明】
本発明i1光学的情報記鋒再生装置に係りt更に詳しく
社記−媒体上の情報を再生する際に、記録ビット列(ト
ラック)を効率よく光ビームが走査するように制御され
た駆動系を有する光学的情報記録再生装置に関する。Detailed Description of the Invention: The present invention relates to an optical information recording and reproducing device.More details-When reproducing information on a medium, a light beam efficiently scans a recorded bit string (track). The present invention relates to an optical information recording/reproducing device having a controlled drive system.
光学的情報記録再生装置とは1元を利用して記録媒体上
に情報を時系列の信号として記録し、或いは記録媒体上
に渦巻状酸い社同心円状に記録された信号列上を光ビー
ムで走査することによって情報を再生する装置であり%
元ディスク〜党磁気ディスタ等が知られている。ここで
社党磁気ディスクを例にとって同心円状に記録ビット列
が形成される場合を第1図で説明する。第1図において
1#i記録媒体、2轄再生装置、3#i可動ミラー、4
は元ビーム、5F1対物レンズ、6は記録手段、7は記
録ビット列を示す。ここで記録ビットは記録手段6によ
って磁化方向の反転として記録され、同心円状に等間隔
の記録ビット列7を形成する。An optical information recording/reproducing device records information as a time-series signal on a recording medium using a single source, or uses a light beam to pass over a signal train recorded in a concentric spiral shape on the recording medium. It is a device that reproduces information by scanning it with %
Original disks ~ party magnetic disks, etc. are known. Here, a case where recording bit strings are formed concentrically on a magnetic disk will be explained with reference to FIG. 1. In Figure 1, 1#i recording medium, 2 playback device, 3#i movable mirror, 4
1 is an original beam, 5F1 objective lens, 6 is a recording means, and 7 is a recording bit string. Here, the recording bits are recorded by the recording means 6 as a reversal of the magnetization direction, forming a recording bit string 7 concentrically spaced at equal intervals.
4で走査する。この光と一ム4の反射光を再生装置内の
受光素子で受け、情報を再生する。この際、記録ビット
列間の間隔即ちトラックピッチは2戸m程度であり、再
生装置2社記録ビットの位置検出手段を有し、可動ミラ
ー3を駆動する事によって、光ビーム4が記録ビット列
上を正確に走査するように制御している。別の記録ビッ
ト列を再生する11 Fis不図示の駆動手段によって
再生装置等の再生手段を牛径方向に移動させる。Scan with 4. This light and the reflected light of 4 are received by a light receiving element in the reproducing device to reproduce information. At this time, the interval between the recorded bit strings, that is, the track pitch, is about 2 m, and the two playback devices have recording bit position detection means, and by driving the movable mirror 3, the light beam 4 moves over the recorded bit string. It is controlled to scan accurately. 11 Fis for reproducing another recorded bit string A reproducing means such as a reproducing device is moved in the radial direction by a driving means (not shown).
上記光磁気ディスクの再生手段を移動させる方法につい
て第2図(1) 、 (b)で説明する。第2図(1)
。A method of moving the reproducing means for the magneto-optical disk will be explained with reference to FIGS. 2(1) and 2(b). Figure 2 (1)
.
(b)は各々光磁気ディスクの側方断面図で、図中8社
再生手段、11#i記録媒体、17は記録ビット列を示
す。再生手段8#1通常不図示のステラピンlモータに
よって1第2図(1)のように記録ビット列間の距離と
同じ間隔で移動され、記録ビット列17上を元ビームに
より照射する。しかしここで記録媒体11か装着の際に
位置ズレ等を起こした場合には第2図(b)のように再
生手段8の移動始点位置社記録ビット列17の真上から
ずれる。また駆動手段はこのよ5なズレ等に対して制御
手段を有さない為、再生手段8はズレを有したまま移動
される。この場合も再生手段8は、前述のように記録ビ
ットを検出し可動ミラー等で元ビームをトラッキングす
る手段を有するので、記録ビット列上を元ビームで正し
く走査することが出来る。しかし元ビームは不必要な方
向への反射を防ぎ、効率のよい再生を行なう為には、ト
ラッキング量が小さい方が望ましい。その為、再生手段
の位置ズレが大きいと、トラッキング量が大きくなり再
生の効率が低下する等の欠点があった。(b) is a side sectional view of each of the magneto-optical disks, in which 8 company reproduction means, 11#i recording medium, and 17 indicate a recording bit string. Reproducing means 8#1 is usually moved by a Stellar Pin l motor (not shown) at the same interval as the distance between recording bit strings as shown in FIG. 2 (1), and irradiates the recording bit string 17 with the original beam. However, if a positional shift occurs when the recording medium 11 is loaded, the starting point of the reproducing means 8 will shift from directly above the recorded bit string 17, as shown in FIG. 2(b). Further, since the driving means does not have a control means for such a deviation, the reproducing means 8 is moved with the deviation. In this case as well, since the reproducing means 8 includes means for detecting recorded bits and tracking the original beam with a movable mirror or the like as described above, it is possible to correctly scan the recorded bit string with the original beam. However, in order to prevent the original beam from being reflected in unnecessary directions and to perform efficient reproduction, it is desirable that the amount of tracking be small. Therefore, if the positional deviation of the reproducing means is large, the amount of tracking increases and the efficiency of reproduction decreases.
本発明の目的は上述の点を鑑み、効率のよい反射光を得
て、S/N比の尚い再生が可能な光学的情報記録再生装
置を提供することである。In view of the above-mentioned points, an object of the present invention is to provide an optical information recording/reproducing apparatus which can obtain reflected light with high efficiency and can reproduce information with a high S/N ratio.
本発明は再生手段の移動間隔を記録ビット列間の間隔よ
り小さくシ、記録ビットの検出信号により再生手段の駆
動を制御することによって、記録ビットに最も近い位置
に再生手段を移動し、トラッキング量を小さくすること
で前記目的を達するものである。The present invention moves the reproducing means to the position closest to the recorded bits by making the moving interval of the reproducing means smaller than the interval between recorded bit strings and controlling the drive of the reproducing means based on the detection signal of the recorded bits, thereby reducing the amount of tracking. The above purpose is achieved by making the size small.
以下、本発明を図面を用いて詳細にviqする。Hereinafter, the present invention will be explained in detail using the drawings.
第3図(1) 、 (b)ii本発明の実施例を示す側
方lIr面図で、図中8は再生手段、11は記録媒体、
17m=17b 、 17Cは各々記録ビット列である
。ここで再生手段8け不図示の駆動手段によって記録ビ
ット列間の距離の1/2の間隔で移動される。又、再生
手段は元ビームをトラッキングし記録ビット列上共
を正しく走査すると臀に、駆動手段の送りピッチと同間
隔のトラッキング範囲内に記録ビットが存在しないとき
は、駆動手段に信号を送り、再生手段を次の位置に移動
させるものである。FIG. 3 (1), (b)ii is a side lIr side view showing an embodiment of the present invention, in which 8 is a reproduction means, 11 is a recording medium,
17m=17b and 17C are recording bit strings, respectively. Here, the eight reproducing means are moved by a driving means (not shown) at intervals of 1/2 of the distance between the recorded bit strings. Furthermore, when the reproducing means tracks the original beam and correctly scans the recording bit string, it sends a signal to the driving means to perform reproduction when there are no recorded bits within the tracking range with the same interval as the feed pitch of the driving means. It moves the means to the next position.
第3a(M)において、人で示される再生手段8の移動
始点位置は%はぼ記録ビット列17a上であり、記録媒
体11が回転することによって円状の記録ビット列17
a上を元ビームで走査する。次に再生手段8は駆動手段
によってBに示す位置に$鋤し元ビームによって記録ビ
ット列を検索する。3a(M), the movement start position of the reproducing means 8 indicated by a person is approximately on the recording bit string 17a, and as the recording medium 11 rotates, the circular recording bit string 17
A is scanned with the original beam. Next, the reproducing means 8 moves to the position shown in B by the driving means and searches for the recorded bit string using the original beam.
ここでトラッキング範囲内に記録ビットが存在しない場
合、再生手段8は駆動信号に信号を送って即座に次の位
置Cに移動し、再び元ビームで検索することによって記
録ビットタIJ17bを得て、この記録ビット列上を元
ビームで走査する。以上の操作を繰り返して記録媒体1
1上の記録ビット列を顔に再生するものである。If there is no recorded bit within the tracking range, the reproducing means 8 sends a signal to the drive signal to immediately move to the next position C, searches again with the original beam to obtain the recorded bit data IJ17b, and retrieves the recorded bit data IJ17b. The recording bit string is scanned with the original beam. Repeat the above operations to create recording medium 1.
1 is used to reproduce the recorded bit string on the face.
ここでis3図(b)のように再生手段8の移動始点位
置人が記録ビット列12為の上から太き(ずれた場合は
、人の位置でトラッキング範囲内に記録ビット列か存在
しない場合、再生手段8は即座にBの位置に移動して記
録ビット列17a上を走査この範囲を越えることはない
。その為、8g2図(ah(b)に示す従来例に比べ、
トラッキング量を小さくおさえることができる。Here, as shown in FIG. IS3 (b), if the movement start point position of the reproduction means 8 is thick from the top for the recording bit string 12 (if it deviates, then if there is no recorded bit string within the tracking range at the position of the person, the reproduction The means 8 immediately moves to position B and scans the recording bit string 17a without exceeding this range. Therefore, compared to the conventional example shown in Fig. 8g2 (ah (b)),
The amount of tracking can be kept small.
本実施例においては、駆動手段の送り間隔を、記録ビッ
ト間の間隔の1/2とした′が、この値に限らず駆動手
段の送り間隔が、記録ビットグリ間の距離よりも小さけ
れば同様の効果を得ることが可能である。又、ここでは
光磁気ディスクを例としたが、本発明離党ディスク等、
光学的情報記録再生装置に広く用いることが出来るもの
である。In this embodiment, the feed interval of the driving means is set to 1/2 of the interval between recording bits, but the value is not limited to this value. It is possible to obtain the effect. In addition, although a magneto-optical disk is used as an example here, the defective disk of the present invention, etc.
It can be widely used in optical information recording and reproducing devices.
以上説明したように本発明は従来の光学的情報記録再生
装置において、光ビームのトラッキング量を小さくする
ことによって、再生時の 8/N比を向上させる効果を
有する。As explained above, the present invention has the effect of improving the 8/N ratio during reproduction in a conventional optical information recording/reproducing apparatus by reducing the tracking amount of the light beam.
第1図社光磁気ディスクl1kWtの概略を示す斜視−
、第2図(1) 、 (b)は6嶌、従来の再生手段の
移動の様子を示す貴方断面−1第3図(a) 、 (b
) tJ各々本発明の再生手段の移動の様子を示す側方
断面図。
8・拳−・・再生手段% 11 @*@@・記碌媒体、
IL17m−17b*17c 6866e記碌ビット列
。
出願人 キャノン株式会社
kj+血、→
手?開
(t))
あろ図
(α)
(F))Figure 1: A perspective view showing the outline of the company's magneto-optical disk 1 kWt.
, Figures 2 (1) and (b) are 6 volumes, and Figures 3 (a) and (b) are cross-sections showing the movement of the conventional regeneration means.
) tJ is a side sectional view showing the movement of the reproducing means of the present invention. 8. Fist - Reproduction means % 11 @*@@ Recording medium,
IL17m-17b*17c 6866e recorded bit string. Applicant Canon Co., Ltd. kj + blood, → hand? Open (t)) Aro diagram (α) (F))
Claims (1)
、皺記録媒体を回転する手段と、該記録ビット列から情
報を再生する再生手段と1、該再生手段と記録媒体とを
該記録媒体の半径方向に一定の送抄関隔で相対的に移動
させる駆動手段から成る光学的情報記録再生装置−にお
いて、前記駆動手段の送り間隔社前記記録ビット列間の
間隔よ)小さく、前記再生手段によって記録ビット列の
位置を検出し前記駆動手段を制御することを特徴とする
光学的情報記録再生装置。(1) A recording medium in which recording bit strings are formed concentrically, a means for rotating the wrinkled recording medium, a reproducing means for reproducing information from the recording bit string; In an optical information recording and reproducing apparatus comprising a driving means that relatively moves at a constant distance in the radial direction, the feeding interval of the driving means is smaller than the interval between the recording bit strings, and the recording by the reproducing means 1. An optical information recording and reproducing apparatus, characterized in that the position of a bit string is detected and the driving means is controlled.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20848581A JPS58108041A (en) | 1981-12-22 | 1981-12-22 | Optical information recording and reproducing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20848581A JPS58108041A (en) | 1981-12-22 | 1981-12-22 | Optical information recording and reproducing device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS58108041A true JPS58108041A (en) | 1983-06-28 |
Family
ID=16556935
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20848581A Pending JPS58108041A (en) | 1981-12-22 | 1981-12-22 | Optical information recording and reproducing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS58108041A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5200937A (en) * | 1988-09-29 | 1993-04-06 | Canon Kabushiki Kaisha | Apparatus for and method of recording and/or reproducing information by means of two actuators |
-
1981
- 1981-12-22 JP JP20848581A patent/JPS58108041A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5200937A (en) * | 1988-09-29 | 1993-04-06 | Canon Kabushiki Kaisha | Apparatus for and method of recording and/or reproducing information by means of two actuators |
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