JPS62164273A - Optical disk device - Google Patents

Optical disk device

Info

Publication number
JPS62164273A
JPS62164273A JP542186A JP542186A JPS62164273A JP S62164273 A JPS62164273 A JP S62164273A JP 542186 A JP542186 A JP 542186A JP 542186 A JP542186 A JP 542186A JP S62164273 A JPS62164273 A JP S62164273A
Authority
JP
Japan
Prior art keywords
circuit
signal
address
power
sector
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
Application number
JP542186A
Other languages
Japanese (ja)
Inventor
Hiromasa Funakoshi
裕正 船越
Yoshikazu Goto
芳和 後藤
Toshiyuki Kori
俊之 郡
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP542186A priority Critical patent/JPS62164273A/en
Publication of JPS62164273A publication Critical patent/JPS62164273A/en
Pending legal-status Critical Current

Links

Landscapes

  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To record an address part with use of the DC power by providing a means which sets the address part sampled by a gate means under a DC power recording state. CONSTITUTION:The laser light delivered from a light source 1 irradiates an optical disk 7 via a splitter 3 and is reflected. This reflected light is divided into two beams by a half mirror 8 and one of these divided rays of light is made incident on a photodetectors 11 and 13 to be turned into the original signals of a tracking control circuit 14 and a focus control circuit 12 respectively. While the other light is turned into a reproduction signal 24 and binary coded by a comparator 27 through an AC amplifier 16. Then this binary signal is inputted to an address reading circuit 18 and a data reading circuit 20 to be decoded. A deciding circuit 22 checks the signals sent from a gate generating circuit 19 and a comparator 23 and delivers a signal to a laser light source control circuit 21 to record with DC power an address part just for a gate sector produced by the circuit 19 as long as an abnormal signal is detected. In a reproduction mode a defective sector is judged by the circuit 22 from the amplitude of the tracking sum signal 25.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、レーザ光を照射することにより情報の記録及
び再生を行う光ディスク装置に関するものである。
DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an optical disc device that records and reproduces information by irradiating it with laser light.

従来の技術 2ペー/゛ 従来、この種の光ディスク装置ではディスクのビットエ
ラー率が問題となっていた。磁気ディスクに比較し、高
密度化されているためエラー率が高く、様々の誤り訂正
方法が提案されてきた。しかし、それでも訂正できない
程の欠陥があったり、記録時の・・−ドウエア不良によ
り正しく記録できないことがあった。そこで、従来は第
3図に示すような記録フォルマットで、記録直後に再読
し、各セクタの記録状態をチェックしていた。不良であ
れば、不良セクタマーり31をアドレス部32の直後ま
たは、次セクタの直前に記録することにより、各セクタ
の記録状態を示していた(特開昭59−94243号公
報等)a不良セクタと判断された領域に書き込まれたデ
ータは使用せず、再度別セクタに書き込腫れ、同様の処
理が繰り返される。1だ、記録直後に再読してデータの
チェックを行わない方式もある。この場合、誤り訂正不
能と予想される欠陥を有するディスクは、出荷検査時に
不良品としてオミットしていた。
2. Description of the Related Art Conventionally, this type of optical disc device has had a problem with the bit error rate of the disc. Compared to magnetic disks, it has a higher error rate due to its higher density, and various error correction methods have been proposed. However, there were still cases where there were defects that could not be corrected, and there were cases where proper recording could not be made due to defective hardware during recording. Therefore, in the past, the recording format shown in FIG. 3 was used, and the recording state of each sector was checked by rereading immediately after recording. If it is defective, the recording state of each sector is indicated by recording a defective sector mark 31 immediately after the address section 32 or immediately before the next sector (Japanese Patent Laid-Open Publication No. 59-94243, etc.) a defective sector The data written in the area determined to be unused is not used, but is written again to another sector, and the same process is repeated. 1. There is also a method that does not reread and check the data immediately after recording. In this case, a disk having a defect that is expected to be uncorrectable is rejected as a defective product at the time of shipping inspection.

発明が解決しようとする問題点 しかしながら、このよう々従来方式では、不良セクタマ
ーりを書き込む領域に欠陥等があった場合に正しく書き
込むことができず、不良セクタの識別が不能となる。ま
た、欠陥が微小であり、書き込み直後の不良セクタマー
りがかろうじて読取れても、経時変化により識別不能に
なる場合があった。その上、不良セクタマーク31を記
録する領域Twを追加したことにより、データ記憶容量
が減少してしまうという問題を有していた。また記録後
にデータチェックを行わない方式では、出荷検査が厳し
く、1ケ所でも訂正不能と予想される領域があれば不良
品となる。そのため歩留りが非常に低くコスト高Kiる
という問題も有していた。
Problems to be Solved by the Invention However, with these conventional methods, if there is a defect or the like in the area where a bad sector marker is to be written, it is not possible to write it correctly, making it impossible to identify the bad sector. Further, the defect is so small that even if the defective sector marker can be barely read immediately after writing, it may become unidentifiable due to changes over time. Furthermore, adding the area Tw for recording the bad sector mark 31 has caused a problem in that the data storage capacity is reduced. Furthermore, in a system in which data is not checked after recording, shipping inspection is strict, and if there is even one area that is predicted to be uncorrectable, the product will be defective. Therefore, there was also a problem that the yield was very low and the cost was high.

本発明はかかる点に鑑みてなされたもので、簡単な構成
でアドレス部を直流ノぐワ−で記録することにより、不
良セクタか否かを判別できる光ディスク装置を提供する
ことを目的としている。
The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an optical disc device that has a simple configuration and can determine whether a sector is a bad sector or not by recording the address part with a DC counter.

問題点を解決するための手段 本発明は前記問題点を解決するため、凸凹によりあらか
じめ形成されたアドレス部(トラック及びセクタ番地)
を有する記録媒体にレーザ光を照射し信号を記録・再生
する」:う構成するとともに、前記アドレス部を抜き出
すゲ−1・手段と、前記ゲー用・手段により抜き出され
たアドレス部を直流・々ワー記録状態にする手段と、前
記アドレス部の反射光量を検出する手段と、直流・々ワ
ー記録状態にしたアドレス部とそうでないアドレス部を
判別する手段と、前記アドレス部を読み取り認識するも
のである。
Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides an address area (track and sector addresses) formed in advance with unevenness.
A recording medium having a laser beam is irradiated with a laser beam to record/reproduce a signal. means for setting the address section to a direct current recording state; means for detecting the amount of reflected light from the address section; means for determining which address section is in the direct current/direct current recording state and the address section that is not; and means for reading and recognizing the address section. It is.

作   用 本発明は前記した構成により、アドレス部のみを直流パ
ワーで記録状態にすることができ、反射光をモニタする
ことにより異常状態であるか否かが検知できる上、アド
レス読取りに関して反射光のACアンプ出力を用いるた
め、アドレス部が直流パワー記録状態でも読取りが可能
である。つまり、本発明では簡単な構成でアドレス読取
り可能と同時に、そのアドレスの反射光量で1つの情報
を得ることができる。そこでデータ記録後のデー5ベー
〕゛ タチェック良・不良判断に利用すれば、不良セクタマー
りを書き込む特別の領域を必要としない。
According to the present invention, with the above-described configuration, only the address section can be put into a recording state using DC power, and by monitoring the reflected light, it is possible to detect whether or not there is an abnormal state. Since the AC amplifier output is used, reading is possible even when the address section is in a DC power recording state. That is, in the present invention, an address can be read with a simple configuration, and at the same time, one piece of information can be obtained from the amount of reflected light at that address. Therefore, if the data is checked after data recording to determine whether it is good or bad, a special area for writing bad sector marks is not required.

したがってアドレス部記録状態の判別だけなので、多小
の欠陥及び経時変化が生じても正しく検出できるととも
に、データ領域に不良セクタマークを書き込1ないので
、記憶容量を減少させることもない。捷た、出荷検査時
、誤り訂正不能と予想される不良セクタのアドレス部の
み直流パワー記録することもできる。ディスク使用時不
良セクタのみ書き込みを禁止すれば、ディスク欠陥によ
る不良ディスクの大部分が救済可能と女り、歩留りを著
しく向上させコスト低下が可能である。
Therefore, since only the recording state of the address section is determined, it is possible to correctly detect small and large defects and changes over time, and since no defective sector marks are written in the data area, there is no reduction in storage capacity. It is also possible to record DC power only in the address part of a defective sector that is expected to be uncorrectable during shipping inspection. If writing is prohibited only in defective sectors when the disk is in use, most of the defective disks due to disk defects can be repaired, and yields can be significantly improved and costs reduced.

実施例 第1図は本発明の光ディスク装置の一実施例を示すブロ
ック図である。1はレーザ光源、2はコリメータレンズ
であり、レーザ光を平行にする。
Embodiment FIG. 1 is a block diagram showing an embodiment of the optical disc device of the present invention. 1 is a laser light source, and 2 is a collimator lens, which makes the laser light parallel.

3は偏光ビームスプリッタ、4は%波長板、6はピック
アップ、6はトラッキング制御回路14゜フォーカス制
御回路12からの信号によりピックアップ6を駆動する
駆動素子。レーザ光源1から6 へ−/ のレーザ光は、直線偏光の一1′!I8コリメータレン
ズ2で平行光となり、偏光ビームスプリッタ−3で光デ
ィスク7の方向へ反射される。レーザ光は、ピックアッ
プ5により微小スポットに絞られ、光ディスク7に照射
される。光ディスク7で反射されたレーザ光は、再度ピ
ンクアンプ6を通過後、偏光ビームスプリッタ3に入る
が、その間イ波長板4を2度通過しているので円偏光に
なり、そのま捷直進する。・・−フミラー8で分割され
た反射光の内、一方は集光レンズ9を通過後、分割ミラ
ー10で2つに分けられ、光検出器11.13に入って
、トラッキング、フォーカス制御の原信号となる。もう
一方は、光検出器15に入りアドレス及びデータ信号検
出に使用する再生信号24となる。再生信号24はAC
アンプ16に入力され、第2図aのようになる。コンパ
レータ17で2値化された後、アドレス読み回路18.
データ読み回路20にそれぞれ入力され、デコード(解
読)が行われる。ゲート発生回路19では、タイマを使
うことでアドレスが読捷れてからTB後ゲー川用が閉じ
、TA後開くようになっている(第2図b)。
3 is a polarizing beam splitter, 4 is a wavelength plate, 6 is a pickup, and 6 is a tracking control circuit 14. A drive element that drives the pickup 6 by a signal from the focus control circuit 12. The laser light from laser light source 1 to 6 -/ is linearly polarized light 1'! The I8 collimator lens 2 converts the light into parallel light, and the polarizing beam splitter 3 reflects the light toward the optical disk 7 . The laser light is focused into a minute spot by the pickup 5 and irradiated onto the optical disc 7. The laser beam reflected by the optical disk 7 passes through the pink amplifier 6 again and then enters the polarizing beam splitter 3, but since it passes through the wavelength plate 4 twice during that time, it becomes circularly polarized light and continues straight. - Of the reflected light split by the mirror 8, one passes through the condenser lens 9, is split into two by the split mirror 10, enters the photodetector 11.13, and is used as a source for tracking and focus control. It becomes a signal. The other signal enters the photodetector 15 and becomes a reproduced signal 24 used for address and data signal detection. The reproduction signal 24 is AC
The signal is input to the amplifier 16 and becomes as shown in FIG. 2a. After being binarized by the comparator 17, the address reading circuit 18.
Each signal is input to the data reading circuit 20 and decoded. In the gate generation circuit 19, the gate is closed after TB and opened after TA after the address is read by using a timer (FIG. 2b).

なお第2図dで、26は同期部、27.28はそれぞれ
トラック、セクタアドレスである。25はトラッキング
和信号であり、光検出器13に入射した光の総和を示す
。光ディスクは記録と未記録状態の反射率変化でデータ
を読み取っているが、トラッキング和信号25は、光デ
ィスク7からの反射光の1部なので、これをモニタする
ことにより、記録と未記録状態を区別することができる
In FIG. 2d, 26 is a synchronization section, and 27 and 28 are track and sector addresses, respectively. 25 is a tracking sum signal, which indicates the total sum of light incident on the photodetector 13. Data is read from optical discs based on changes in reflectance between recorded and unrecorded states, but since the tracking sum signal 25 is part of the reflected light from the optical disc 7, by monitoring it, it is possible to distinguish between recorded and unrecorded states. can do.

コンパレータ23に入力されたトラッキング和信号25
は、LPF (図示ぜず)を通過し、2値化レベル29
(第2図d)Kより2値化される。判定回路22では、
ゲート発生回路19.コンパレータ23からの信号によ
り、レーザ光源制御回路21にアドレス部を直流パワー
記録にするか否かを命令する。つ捷り、データ記録後チ
ェックを行い、異常を検出すれば、ゲート発生回路19
で発生したケート区間だけ、アドレス部を直流パワー記
録するわけである。第2図Cに記録・未記録のアドレス
部を含む再生信号24を示す。またp]生時は、トラッ
キング和信号25の振幅に応じて不良セクタを判断する
ことが可能となり、判定回路22で判断された後、CP
U等(図示せず)に伝えられる。再生信号24はACア
ンプ16を通るため、アドレス部が直流パワー記録され
ても、はとんどその波形に変化がない(第2図e)。わ
ずかに、ゲート部の始終端に異常をきたすだけであるか
ら、未記録状態のアドレス部を読取るのと同一回路で、
2値下、デコードできる。したがって、不良セクタを示
すため、アドレス部を直流パワー記録しても、アドレス
読みが可能であり、不良セクタであることを簡単に知る
ことができる。なお、反射光量の判定にトラッキング和
信号を使用したが、フォーカス和信号、再生信号(第1
図でu24)でも同様の効果を得ることができる。
Tracking sum signal 25 input to comparator 23
passes through an LPF (not shown) and is binarized at level 29.
(Figure 2 d) Binarized from K. In the determination circuit 22,
Gate generation circuit 19. A signal from the comparator 23 instructs the laser light source control circuit 21 whether or not to record DC power in the address section. A check is performed after the switching and data recording, and if an abnormality is detected, the gate generation circuit 19
DC power is recorded in the address section only during the gate section that occurs. FIG. 2C shows a reproduced signal 24 including recorded and unrecorded address parts. In addition, when a sector is generated, it is possible to judge a bad sector according to the amplitude of the tracking sum signal 25, and after being judged by the judgment circuit 22, the CP
The information is transmitted to U, etc. (not shown). Since the reproduced signal 24 passes through the AC amplifier 16, there is almost no change in its waveform even if the address section is recorded with DC power (Fig. 2e). Since it only causes a slight abnormality at the beginning and end of the gate section, the same circuit that reads the unrecorded address section can be used.
2 values lower, can be decoded. Therefore, in order to indicate a defective sector, even if the address part is recorded with DC power, the address can be read and the fact that it is a defective sector can be easily known. Although the tracking sum signal was used to determine the amount of reflected light, the focus sum signal and the reproduction signal (first
A similar effect can be obtained with u24 in the figure.

発明の効果 本発明は、アドレス部のみ直流パワー記録状態にするの
で、アドレス読取りが可能であり、反射光量をモニタす
ることで、そのアドレスのデータ領域の良・不良を判別
することができ、しかも次9べ−1 のような効果も得られる。すなわち本発明では、不良セ
クタマークを特定領域に記録する方式に比較して、デー
タ領域を減少させることなく、かつ欠陥・経時変化が生
じても正しく検出できるのである。斗た、出荷検査時に
おいて、誤り訂正不能と予想されるセクタのアドレス部
を直流パワー記録状態にすれば、良・不良セクタを判別
でき、不良と予想されるセクタ(未記録)への書き込み
を禁止できる。したがって、記録時のエラー率を向上さ
せることが可能で、ディスク欠陥のため(誤り訂正不能
として)不良品としてきたディスクの大部分も使用可能
となる。
Effects of the Invention In the present invention, since only the address area is put into the DC power recording state, the address can be read, and by monitoring the amount of reflected light, it is possible to determine whether the data area of the address is good or bad. Effects like the following 9B-1 can also be obtained. That is, in the present invention, compared to a method of recording defective sector marks in a specific area, it is possible to correctly detect defects and changes over time without reducing the data area. Additionally, during shipping inspection, if the address part of the sector where errors are expected to be uncorrectable is set to a DC power recording state, it is possible to distinguish between good and bad sectors, and write to sectors (unrecorded) that are expected to be bad can be avoided. Can be prohibited. Therefore, it is possible to improve the error rate during recording, and it becomes possible to use most of the disks that have been rejected due to disk defects (because errors cannot be corrected).

以上に加えて、識別用の信号(アドレス部への直流パワ
ー記録)を記録しているにもかかわらず、アドレス読取
りが可能で様々々用途に利用できる。
In addition to the above, even though an identification signal (DC power recording in the address section) is recorded, addresses can be read and can be used for various purposes.

例えば、特定者のみの読出しを許可する秘密保護等にも
利用できる。
For example, it can be used for security protection that allows only specific persons to read the information.

また消去型ディスクであれば、書き込み禁IJ−マーク
として利用でき、書き適寸れた情報の消失を防ぐことが
可能である(ライト・プロテクション)。
Furthermore, if it is an erasable disc, it can be used as a write-protection IJ-mark, and it is possible to prevent the loss of written information (write protection).

1o八 ゛ 以上述べてきたように、本発明の効果は犬であり、かつ
実現容易で実用」二きわめて有用である。
As stated above, the effects of the present invention are significant, easy to implement, and extremely useful.

なお、本発明では、記録後の反射率が上列するディスク
について説明したが、記録後反射率が低下するディスク
についても同様である。
Note that although the present invention has been described with respect to disks with higher reflectances after recording, the same applies to disks with lower reflectances after recording.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の一実施例における光ディスク装置のブ
ロック図、第2図は同装置の信号波形図、第3図は従来
例における光ディスク装置の記録フォーマットを示す図
である。 11.13.15・・・・・・光検出器、16・・・・
・ACアンプ、17.23・・・・・・コンパレータ、
18・・・・・・アドレス読み回路、19・・・・・・
ゲート発生回路、20・・・・・・データ読み回路、2
1・・・・・・レーザ光源制御回路、22・・・・・・
判定回路、24・・・・・再生信号。
FIG. 1 is a block diagram of an optical disc device according to an embodiment of the present invention, FIG. 2 is a signal waveform diagram of the same device, and FIG. 3 is a diagram showing a recording format of a conventional optical disc device. 11.13.15...Photodetector, 16...
・AC amplifier, 17.23... comparator,
18...Address reading circuit, 19...
Gate generation circuit, 20...Data reading circuit, 2
1... Laser light source control circuit, 22...
Judgment circuit, 24...Reproduction signal.

Claims (1)

【特許請求の範囲】[Claims] 凸凹によりあらかじめ形成されたアドレス部(トラック
及びセクタ番地)を有する記録媒体にレーザ光を照射し
信号を記録・再生するよう構成するとともに、前記アド
レス部を抜き出すゲート手段と、前記ゲート手段により
抜き出されたアドレス部直流パワー記録状態にする手段
と、前記アドレス部の反射光量を検出する手段と、直流
パワー記録状態にしたアドレス部とそうでないアドレス
部を判別する手段と、前記アドレス部を読み取り認識す
る手段を備えた光ディスク装置。
A recording medium having an address area (track and sector address) formed in advance with unevenness is configured to record and reproduce a signal by irradiating a laser beam with the recording medium, and a gate means for extracting the address area; means for setting the address section to a DC power recording state, means for detecting the amount of reflected light of the address section, means for determining which address section is in the DC power recording state and which is not, and reading and recognizing the address section. An optical disc device equipped with a means for
JP542186A 1986-01-14 1986-01-14 Optical disk device Pending JPS62164273A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP542186A JPS62164273A (en) 1986-01-14 1986-01-14 Optical disk device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP542186A JPS62164273A (en) 1986-01-14 1986-01-14 Optical disk device

Publications (1)

Publication Number Publication Date
JPS62164273A true JPS62164273A (en) 1987-07-20

Family

ID=11610694

Family Applications (1)

Application Number Title Priority Date Filing Date
JP542186A Pending JPS62164273A (en) 1986-01-14 1986-01-14 Optical disk device

Country Status (1)

Country Link
JP (1) JPS62164273A (en)

Similar Documents

Publication Publication Date Title
JP2655682B2 (en) Magneto-optical information recording / reproducing device
JPH03162720A (en) Recording medium and reproducing device for this medium
US4879703A (en) Magneto-optic memory apparatus with defect detection of recording medium during erasing operation
JPH0276144A (en) Optical recorder
JPH03502384A (en) Single laser recording direct playback system (DRAW)
JPH05258379A (en) System for regenerating signal
JPH0154778B2 (en)
JPS62164273A (en) Optical disk device
US5748590A (en) Apparatus for inspecting disc recording medium
JP3074183B2 (en) Information recording medium and information recording medium evaluation device
JPS60121575A (en) Optical information recording and reproducting device
EP1209679A2 (en) Recording apparatus and method for optical recording medium
JPH08249659A (en) Method for inspecting defect of optical disk
JP3086465B2 (en) Signal playback method
JPH05144194A (en) System for reproducing magneto-optical disk
JPH0386955A (en) Recording/erasing confirming method for magneto-optical recording system
JP2985233B2 (en) Disk-shaped recording medium and recording / reproducing apparatus for the disk-shaped recording medium
JPH05250675A (en) Optical recording and reproducing device
JP3300807B2 (en) Optical information recording device and optical information recording method
JPS6251035A (en) Recording and reproducing device for optical information
JP2629676B2 (en) Optical disc playback device
JPS61198430A (en) Optical information recording device
JPS6224436A (en) Optical information device
JPH05210889A (en) Magneto-optical recording medium recording/reproducing/ erasing device
JPH07169201A (en) Optical disk recorder