JP2532362B2 - Light disk - Google Patents
Light diskInfo
- Publication number
- JP2532362B2 JP2532362B2 JP59111147A JP11114784A JP2532362B2 JP 2532362 B2 JP2532362 B2 JP 2532362B2 JP 59111147 A JP59111147 A JP 59111147A JP 11114784 A JP11114784 A JP 11114784A JP 2532362 B2 JP2532362 B2 JP 2532362B2
- Authority
- JP
- Japan
- Prior art keywords
- disc
- mark
- marks
- identification
- 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.)
- Expired - Lifetime
Links
- 230000003287 optical effect Effects 0.000 claims description 10
- 238000001514 detection method Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 6
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
- G11B19/02—Control of operating function, e.g. switching from recording to reproducing
- G11B19/04—Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
- G11B23/38—Visual features other than those contained in record tracks or represented by sprocket holes the visual signals being auxiliary signals
- G11B23/42—Marks for indexing, speed-controlling, synchronising, or timing
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
- G11B33/10—Indicating arrangements; Warning arrangements
Landscapes
- Optical Record Carriers And Manufacture Thereof (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は各種あるディスクのうち、記録再生可能な，
または再生専用の光ディスクに関するもので、光ディス
クを使用する装置が、その光ディスクの種類を識別する
ために予じめディスクに付されるディスク識別マークに
特徴を有する。DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention is capable of recording and reproducing from various discs,
Alternatively, the present invention relates to a read-only optical disc, which is characterized by a disc identification mark attached to a preliminary disc for identifying the type of the optical disc by an apparatus using the optical disc.
従来例の構成とその問題点 従来、発売されているディスクの種類は少いが従来、
例えば文書，データ，静止画，映像と音声等いろいろな
種類のディスクが現われることが予想される。また、光
ディスクの場合、利用者が直接手で触れることが可能な
ため、ディスクに汚れ，傷等が付き、識別マークの検出
が困難になる。Conventional configuration and its problems Conventionally, there are few types of discs on sale, but
For example, it is expected that various types of discs such as documents, data, still images, video and audio will appear. Further, in the case of an optical disc, the user can directly touch it, so that the disc becomes dirty and scratched, making it difficult to detect the identification mark.
既に識別マークについては特願昭59−16518号等で提
案されている。この従来例に示された識別マークを第１
図に示す。The identification mark has already been proposed in Japanese Patent Application No. 59-16518. The identification mark shown in this conventional example is the first
Shown in the figure.
第１図においてａはディスク１の直径、ｂはディスク
のセンター穴の直径、ｃはデータ，映像信号等の情報を
記録する情報記録帯、ｄはディスクの種類を識別するた
めのマークを付すディスク識別帯である。2a,2bには各
記録トラックのアドレス信号等が記録されている。３が
ディスクの識別マークであり、ディスクの種類によりそ
のマークの数及び配置が異る。In FIG. 1, a is the diameter of the disc 1, b is the diameter of the center hole of the disc, c is an information recording band for recording information such as data and video signals, and d is a disc with a mark for identifying the type of disc. It is an identification band. Address signals and the like of each recording track are recorded on 2a and 2b. Reference numeral 3 is a disc identification mark, and the number and arrangement of the marks differ depending on the type of disc.
その識別マークを読み取り、ディスク種類を識別後、
ディスクに適した再生または記録動作，例えば光ヘッド
の送り速度の切換え、信号の検出回路の切換え、特殊動
作の切換え等を行う。After reading the identification mark and identifying the disc type,
A reproduction or recording operation suitable for the disk, for example, switching of the feed speed of the optical head, switching of the signal detection circuit, switching of special operation, etc. are performed.
従来のこのようなマーク３は簡単な回路で識別可能で
あるが、識別帯に汚れ、傷等がつけば傷等による為のマ
ークを正しいマークと読み誤り、続く動作をしなくな
る。これは本来、マーク３の位置とアドレス2aの位置が
一致していることからマーク３を検出し、その位置を基
準としてアドレス信号を読み取り、光ヘッドの位置を知
っていたが、偽のマークを正しいマークと読み誤まれば
当然アドレス信号が読めないため光ヘッドの位置が不明
になり続く動作を起せなくなり、ディスク上のデータ，
映像信号等の情報の読出しができなくなる。Although such a conventional mark 3 can be identified by a simple circuit, if the identification band is soiled or scratched, a mark due to a scratch or the like will be misread as a correct mark and the subsequent operation will not be performed. Originally, since the position of the mark 3 and the position of the address 2a coincided with each other, the mark 3 was detected, the address signal was read based on the position, and the position of the optical head was known. If misread as a correct mark, the address signal cannot be read because the position of the optical head becomes unknown and the subsequent operation cannot occur.
It becomes impossible to read information such as video signals.
光ディスクは一般に、通常のオーディオレコードと同
様、使用者が直接ディスクを触れることが可能なため、
識別帯にも汚れが付着、あるいは傷がつく可能性は十分
にある。第２図に識別マークを検出する構成を、第３図
に検出する回路図を、第４図に識別マークの検出波形を
示す。Optical discs, like ordinary audio records, allow the user to directly touch the disc,
There is a good chance that the identification band will also become soiled or scratched. FIG. 2 shows a configuration for detecting the identification mark, FIG. 3 shows a circuit diagram for detecting the identification mark, and FIG. 4 shows a detection mark detection waveform.
ディスク１はモータ４に固定されたターンテーブル５
の上にのり、所定の回転数で回転する。マーク識別帯ｄ
の下には発光用のLED7と受光用の検出器８で構成された
フォトカプラー６が置かれている。そのLED7の光を識別
帯に当て、その反射光を検出器８で検出し、マークの反
射率の変化を電気信号に変換し、出力９を得る。Disk 1 is a turntable 5 fixed to a motor 4
On top of it and rotate at a specified speed. Mark identification band d
A photocoupler 6 composed of an LED 7 for emitting light and a detector 8 for receiving light is placed below. The light of the LED 7 is applied to the identification band, the reflected light is detected by the detector 8, the change in the reflectance of the mark is converted into an electric signal, and the output 9 is obtained.
検出回路は第３図に示すようにLED7に電流を流して発
光させ、ディスクで反射した光を光検出器８で検出し、
出力９を得る。この光検出器８の出力波形は第４図９の
ようになっており、マークの部分は反射率が低いため出
力電圧は低く、それ以外では高くなっている。更に波形
成形後は同図ｂに示すようにマークの位置でパルス11が
得られる。As shown in FIG. 3, the detection circuit applies a current to the LED 7 to cause it to emit light, and the light reflected by the disk is detected by the photodetector 8,
Get the output 9. The output waveform of the photodetector 8 is as shown in FIG. 4, and the output voltage is low because the reflectance is low at the mark portion, and is high at other portions. Further, after waveform shaping, a pulse 11 is obtained at the mark position as shown in FIG.
ところがディスクに蒸着した記録膜は反射率の変化が
大きく、更に汚れ、傷等が付けば出力波形は第５図ａに
示すように識別マーク12と同様の信号13が検出されてし
まい、検出のタイミングによっては誤ったマーク15を正
しい識別マーク14と読み誤りディスク上のデータ，映像
信号の読み取りができないとういう問題を生じる。However, the recording film deposited on the disk has a large change in reflectance, and if it is further soiled or scratched, the output waveform will detect a signal 13 similar to the identification mark 12 as shown in FIG. Depending on the timing, the wrong mark 15 is incorrectly read as the correct identification mark 14 and there is a problem that the data and video signal on the disc cannot be read.
特にこのマークをディスクの回転基準としており、本
来１カ所だけのマークが数カ所に現われれば正常な回転
をしなくなる。また１回転に相当する時間より少し短い
時間，マークの検出回路を動作させないようにすれば、
１回転に１つのパルスのみが得られるが、得られたパル
スが正しい識別マークであるか否かは電気的に判断する
のは困難である。この場合はモータの回転は正常になる
が信号の記録、または再生のタイミングが誤るため問題
である。In particular, this mark is used as the rotation standard of the disk, and if only one mark originally appears at several places, normal rotation will not be achieved. If the mark detection circuit is not operated for a time slightly shorter than the time corresponding to one rotation,
Only one pulse is obtained per revolution, but it is difficult to electrically judge whether the obtained pulse is a correct identification mark. In this case, the rotation of the motor becomes normal, but the timing of signal recording or reproduction is incorrect, which is a problem.
発明の目的 ディスクを使用する装置で、使用したディスクの識別
を簡単な回路構成でかつ信頼性高く行なえるようなディ
スクの識別マークをディスクに付すことを目的とする。It is an object of the present invention to provide a disc identification mark on a disc using an apparatus that uses a disc with a simple circuit configuration and with high reliability.
発明の構成 本発明は、光学的に識別可能な複数のマークを、円管
状にほぼ全周にをわたって所定の間隔で設け、その間隔
の相異により、ディスクの径あるいはトラック形状等を
表示せんとするものである。According to the present invention, a plurality of optically identifiable marks are provided in a tubular shape at a predetermined interval over substantially the entire circumference, and a disc diameter, a track shape, or the like is displayed depending on the difference in the intervals. It is something to do.
実施例の説明 本発明に係るディスク識別マークの一実施例を第６図
に拡大して示す。Description of Embodiments One embodiment of a disc identification mark according to the present invention is enlarged and shown in FIG.
一周にわたり一部を除き一定周期でマーク17を記録す
る。一部マークの無い区間18は基準位置を示すためのも
ので、マークの整数個分欠落させている。The mark 17 is recorded at a constant cycle except for a part of the circumference. The part 18 where there is no mark is for indicating the reference position, and is omitted by an integral number of marks.
第７図に本発明に係るディスクの識別マークの検出回
路のブロック図を示す。ディスク１に記録されたディス
ク識別マークをフォトカプラー19で読み取り、交流結合
回路20で直流成分，すなわちディスクの反射率の平均値
に相当する部分を除去し、同調回路21でディスクが回転
した時に得られる周波数成分を同調増幅し、検波回路22
で交流信号の振幅を交流成分に変換し、ある基準電圧24
とレベル比較回路23で比較する。FIG. 7 shows a block diagram of a disc identification mark detection circuit according to the present invention. The disc identification mark recorded on the disc 1 is read by the photocoupler 19, the direct current component, that is, the portion corresponding to the average value of the reflectance of the disc is removed by the AC coupling circuit 20, and it is obtained when the disc is rotated by the tuning circuit 21. The frequency component that is tuned and amplified, and the detection circuit 22
To convert the amplitude of the AC signal into an AC component,
And the level comparison circuit 23.
その出力26をラッチ25によりラッチすることにより、
使用したディスクが再生装置に適合するものであるかの
識別出力27を出すと同時にディスクに記録されている情
報の基準信号の出力26する。By latching its output 26 with the latch 25,
An identification output 27 as to whether the used disc is suitable for a reproducing apparatus is output, and at the same time, a reference signal output 26 of information recorded on the disc is output.
今、仮りにマーク17の数が一周50個分（一部マークの
欠けた部分にもマークがあるとして）あるとし、ディス
クの回転数が30rpsとすれば検出される識別のマークの
周波数は1.5kHzになる。Now, assuming that the number of marks 17 is 50 for one round (assuming that there are marks even in the part where the marks are partially missing), and the rotation speed of the disk is 30 rps, the frequency of the identification mark detected is 1.5. It becomes kHz.
装置が１周50個のマークのあるディスクが適合すると
すれば交流結合部分では1.5kHzが十分通過できるカット
オフ周波数を持つフィルターとし、同調回路の同調周波
数は当然1.5kHzとする。If the device fits a disk with 50 marks per round, the filter should have a cut-off frequency that allows 1.5kHz to pass through sufficiently in the AC coupling section, and the tuning frequency of the tuning circuit should be 1.5kHz.
他のマークの数の異るディスクであれば同調回路21の
出力は小さくなるため、レベル比較器23の入力側では基
準電圧以下になり、出力は適合ディスクと逆になって不
適合ディスクと識別できる。Since the output of the tuning circuit 21 becomes small if the disc has other numbers of different marks, the voltage becomes lower than the reference voltage at the input side of the level comparator 23, and the output is opposite to the conforming disc and can be discriminated as the nonconforming disc. .
発明の効果 本発明はディスクのほぼ全周に一定周期でマークを記
録しておくため検出回路では交流結合，交流増幅が可能
になる。これは直流成分を除くこととができるというこ
とでディスクの反射率のバラツキあるいは反射率のムラ
を殆んど無視できるということを意味しており、検出回
路を非常に簡易化できる。EFFECTS OF THE INVENTION According to the present invention, since marks are recorded at a constant cycle on almost the entire circumference of the disc, AC coupling and AC amplification are possible in the detection circuit. This means that the DC component can be removed, so that the variation in the reflectance of the disk or the unevenness of the reflectance can be almost ignored, and the detection circuit can be greatly simplified.
従来の直流レベルで比較する場合はフォトカプラーの
検出出力のうち基底レベルと検出出力の最大値を別に読
み取り、マークの波形整形用の比較回路に与える必要が
あった。In the case of comparison with the conventional DC level, it is necessary to separately read the base level and the maximum value of the detection output among the detection outputs of the photocoupler and give them to the comparison circuit for shaping the waveform of the mark.
またディスクの傷等にも直接影響を受けていた。しか
しながら本発明では交流増幅し、同調回路を通すため、
その同調周波数外のディスクの反射ムラ，傷等の影響を
受けにくく、ディスクの識別の信頼性は高い。It was also directly affected by scratches on the disc. However, in the present invention, since AC amplification is performed and a tuning circuit is passed,
The reliability of disc identification is high because it is unlikely to be affected by reflection irregularities and scratches on the disc outside the tuning frequency.
また、ディスクの種類をマークの数を変えるだけで区
別できるため、ディスク作成時のエンコーダの変更が容
易で対応がしやすい。In addition, since the type of disc can be distinguished only by changing the number of marks, it is easy to change the encoder when creating the disc and it is easy to deal with it.
【図面の簡単な説明】 第１図は従来ディスクのディスク識別マークを示す平面
図、第２図は識別マークを検出する検出手段を示す構成
図、第３図は識別マークの検出部の電気回路図、第４図
は検出した識別マークの波形図、第５図は従来マークで
誤動作を起すときの状態を示す波形図、第６図は本発明
に係るディスク上の識別マークを示す平面図、第７図は
本発明に係るマークの検出回路の１例を示すブロック図
である。 17……マーク、18……マークの無い区間。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing a disc identification mark of a conventional disc, FIG. 2 is a configuration diagram showing a detecting means for detecting the identification mark, and FIG. 3 is an electric circuit of an identification mark detecting portion. FIGS. 4 and 5 are waveform diagrams of detected identification marks, FIG. 5 is a waveform diagram showing a state where a conventional mark causes a malfunction, and FIG. 6 is a plan view showing identification marks on a disc according to the present invention. FIG. 7 is a block diagram showing an example of a mark detection circuit according to the present invention. 17 …… mark, 18 …… section without mark.
Claims (2)
るいは再生する情報記録帯外に、光学的に識別可能な複
数マークを円上にほぼ全周にわたって一定周期で設け、
その周期をトラック形状，ディスク径等の差異によりな
らしめたことを特徴とする光ディスク。1. A plurality of optically identifiable marks are provided on a circle at a constant cycle over substantially the entire circumference outside an information recording band for recording or reproducing an information signal by irradiation of a light beam.
An optical disc characterized in that its cycle is equalized by the difference in track shape and disc diameter.
数のマークを設け、その欠除部分をディスクの回転位相
の位相基準としたことを特徴とする特許請求の範囲第１
項記載の光ディスク。2. The invention according to claim 1, wherein a cutout portion is provided in a partial section on the concentric circle to provide a plurality of marks, and the cutout portion is used as a phase reference of the rotational phase of the disk.
Optical disc according to the item.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59111147A JP2532362B2 (en) | 1984-05-31 | 1984-05-31 | Light disk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59111147A JP2532362B2 (en) | 1984-05-31 | 1984-05-31 | Light disk |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60254429A JPS60254429A (en) | 1985-12-16 |
| JP2532362B2 true JP2532362B2 (en) | 1996-09-11 |
Family
ID=14553647
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59111147A Expired - Lifetime JP2532362B2 (en) | 1984-05-31 | 1984-05-31 | Light disk |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2532362B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE1008963A3 (en) | 1994-11-18 | 1996-10-01 | Philips Electronics Nv | DISC REGISTRATION CONTAINER, AND RECORDING AND / OR READING DEVICES FOR RECORDING / READING INFORMATION ON / OF THE REGISTRATION CONTAINER. |
| JP2010140576A (en) * | 2008-12-15 | 2010-06-24 | Hitachi Ltd | Multilayer optical disk, and optical disk drive |
-
1984
- 1984-05-31 JP JP59111147A patent/JP2532362B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60254429A (en) | 1985-12-16 |
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