JP2569627B2 - Optical disk drive - Google Patents
Optical disk driveInfo
- Publication number
- JP2569627B2 JP2569627B2 JP62293321A JP29332187A JP2569627B2 JP 2569627 B2 JP2569627 B2 JP 2569627B2 JP 62293321 A JP62293321 A JP 62293321A JP 29332187 A JP29332187 A JP 29332187A JP 2569627 B2 JP2569627 B2 JP 2569627B2
- Authority
- JP
- Japan
- Prior art keywords
- optical disk
- optical
- recording
- head
- track
- 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
Landscapes
- Moving Of Heads (AREA)
- Moving Of Head For Track Selection And Changing (AREA)
- Optical Recording Or Reproduction (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は光ディスク装置に関し、時に光を用いて同板
状の光ディスクへの記録および再生を行なう光ディスク
装置に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device, and more particularly to an optical disk device that performs recording and reproduction on an optical disk having the same shape by using light.
従来、この種の光ディスクは同板状の光ディスクに同
心円またはスパイラル状の記録トラックを有し、基本的
に１つの光ヘッドを用いて微小スポットを記録トラック
上に形成して情報の記録および再生を行なう。Conventionally, this type of optical disk has concentric or spiral recording tracks on the same plate-shaped optical disk, and basically records and reproduces information by forming a minute spot on the recording track using one optical head. Do.
このような光ディスクの記録方式としては大きく２種
類が考えられる。第１はディスクの回転数を常に一定に
して記録再生を行なうCAV方式であり、第２はディスク
上のトラックと光ヘッドの相対速度が一定になるように
回転数を変化させるCLV方式である。There are roughly two types of recording methods for such optical discs. The first is a CAV system in which recording and reproduction are performed while the rotation speed of the disk is always kept constant, and the second is a CLV system in which the rotation speed is changed so that the relative speed between the track on the disk and the optical head becomes constant.
CAV方式において光ヘッドによりトラックへ記録また
は再生をする時のデータの転送レートを一定に保つため
には、ディスクの内周側トラックに比べ外周側トラック
でのデータの記録線密度は低下させる必要がある。この
ため、ディスク全体での記録容量はCLV方式に比べて低
下する、記録線密度を一定にするとディスク内周部と外
周部ではデータの転送レートが大きく異なることにな
り、光ディスク装置の外部の装置との間のデータが転送
が難しくなる。In the CAV method, in order to maintain a constant data transfer rate when recording or reproducing data to or from a track using an optical head, the data recording linear density on the outer track must be reduced compared to the inner track on the disk. is there. For this reason, the recording capacity of the entire disc is lower than that of the CLV system. If the recording linear density is kept constant, the data transfer rate is greatly different between the inner and outer peripheral portions of the disc. Transferring data to and from it becomes difficult.
一方CLV方式では記録線密度を一定とすればデータ転
送レートが変化することはないが、トラック位置の半径
によってディスク回転数を変化させる必要があるため、
アクセスタイムを速くすることが難しい。On the other hand, in the CLV system, if the recording linear density is fixed, the data transfer rate does not change, but since the disk rotation speed needs to be changed according to the radius of the track position,
It is difficult to make access time fast.
本発明の目的は、CAV方式の光ディスクにおいて、デ
ータの転送レートを変化させることなくCLV方式と同様
の記録容量を得ることが可能な光ディスク装置を提供す
ることにある。An object of the present invention is to provide an optical disc device capable of obtaining a recording capacity similar to that of the CLV system without changing the data transfer rate in a CAV optical disk.
本発明の光ディスク装置は、同心円またはスパイラル
状の記録トラックを有し表裏両面で記録または再生可能
な光ディスクと、前記表裏両面に対向して設けられた第
１の光ヘッドと第２の光ヘッドとを有する光ディスク装
置において、前記光ディスクは常に一定の回転数で回転
しており、第１の光ヘッドが光ディスク最内周トラック
にある場合には第２の光ヘッドは光ディスク最外周トラ
ックにあり、第１の光ヘッドと光ディスク上のトラック
との間の回転方向における相対移動速度と第２の光ヘッ
ドと光ディスク上のトラックとの間の回転方向における
相対移動速度とを加えた和が常に一定となるように２つ
の光ヘッドを光ディスク半径方向に移動して、２つの光
ヘッドが同時に記録または再生動作を行うようにしたこ
とを特徴とし、さらに、光ディスクのトラック上の記録
線密度が略一定であることを特徴とする。An optical disk device according to the present invention includes an optical disk having concentric or spiral recording tracks and capable of recording or reproducing on both front and rear surfaces, and a first optical head and a second optical head provided opposite to the front and rear surfaces. In the optical disk device having the optical disk, the optical disk is always rotating at a constant rotation speed, and when the first optical head is located at the innermost track of the optical disk, the second optical head is located at the outermost track of the optical disk. The sum of the relative movement speed in the rotation direction between the first optical head and the track on the optical disk and the relative movement speed in the rotation direction between the second optical head and the track on the optical disk is always constant. The two optical heads are moved in the radial direction of the optical disk so that the two optical heads perform a recording or reproducing operation at the same time. , Wherein the recording linear density on tracks of the optical disk is substantially constant.
次に本発明の実施例について図面を参照して説明す
る。Next, embodiments of the present invention will be described with reference to the drawings.
第１図は本発明の一実施例を示す。第１図において、
本発明の一実施例は同心円またはスパイラル状の記録ト
ラックを有し、表裏両面で記録または再生可能な光ディ
スク11と、表裏両面に対向して設けられた第１の光ヘッ
ド13aおよび第２の光ヘッド13bとを、この両光ヘッド13
a,13bを移動させるヘッドを送り機構17,18,19とを含
む。FIG. 1 shows an embodiment of the present invention. In FIG.
In one embodiment of the present invention, an optical disk 11 having concentric or spiral recording tracks and capable of recording or reproducing on both front and rear surfaces, a first optical head 13a and a second optical head provided opposite to both front and rear surfaces. The head 13b and the optical head 13
a, 13b, and a feed mechanism 17, 18, 19 for moving the head.
光ディスク11は回転モータ12により常に一定の速度で
回転する。光ヘッド送り機構は光ヘッド13bが外周から
内周に向って移動するとき、他方のヘッド13aの内周か
ら外周に向って移動し、両面のデータ転送レートの和が
常に一定となるように構成されている。The optical disk 11 is always rotated at a constant speed by the rotation motor 12. The optical head feed mechanism is configured so that when the optical head 13b moves from the outer circumference to the inner circumference, the optical head 13b moves from the inner circumference to the outer circumference of the other head 13a, and the sum of the data transfer rates on both surfaces is always constant. Have been.
ヘッド送り機構は例えば、スクリューネジ17a,17bを
用いて行なえる。送りモータ19の回転を平歯車18a,18b
により図示するようにスクリューネジ17a,17bに伝える
と、上下のスクリューネジ17a,17bは同方向に回転をす
る。したがってスクリューネジの一方を逆ネジにするこ
とにより第１の光ヘッド13aと第２の光ヘッド13bを同時
に逆方向に送ることができる。The head feed mechanism can be performed using, for example, screw screws 17a and 17b. The rotation of the feed motor 19 is controlled by the spur gears 18a and 18b.
, The upper and lower screw screws 17a, 17b rotate in the same direction. Therefore, the first optical head 13a and the second optical head 13b can be simultaneously sent in the opposite directions by setting one of the screw screws to the reverse screw.
なお、ヘッド送り機構はスクリューネジを同方向のネ
ジにした場合に送りモータ19の歯車と一方の平歯車18a
又は18bとの間にアイドル平歯車（図示せず）を入れる
ことによりスクリューネジ17a,17bが逆方向に回転する
ので光ヘッド13a,13bを同時に逆方向に送ることもでき
る。Note that the head feed mechanism uses the gear of the feed motor 19 and one spur gear 18a when the screw is screwed in the same direction.
Or, by inserting an idle spur gear (not shown) between the optical heads 18a and 18b, the screw heads 17a and 17b rotate in the opposite directions, so that the optical heads 13a and 13b can be simultaneously sent in the opposite directions.
本実施例においは光ディスク上での記録線密度を一定
としたディスクを一定の回転数で回転したとき、光ディ
スクがディスク外周部にあるときにはデータ転送レート
が速く、また内周部にあるときは遅くなる。このときの
転送レートは光ヘッドとディスクとの間の相対的な移動
速度に比例することになる。したがって光ヘッドを２つ
設けた場合、一方の光ヘッドを最外周から内周へ向け
て、他方の大ヘッドを最内周から外周へ向けて記録再生
を行えば、２つの光ヘッドのディスクとの間の相対速度
の和を常に一定にするとができる。このように本実施例
は記録または再生におけるデータの各ヘッドごとの転送
レートをその光ヘッドのあるディスク半径位置に比例し
て変化させ、装置外部とのデータの転送を２つのヘッド
のデータを加えて行なえば見かけ上常に一定の転送レー
トを得ることができる。In this embodiment, when a disk having a constant recording linear density on an optical disk is rotated at a constant rotational speed, the data transfer rate is high when the optical disk is at the outer peripheral portion, and slower when the optical disk is at the inner peripheral portion. Become. The transfer rate at this time is proportional to the relative moving speed between the optical head and the disk. Therefore, when two optical heads are provided, if recording / reproducing is performed with one optical head directed from the outermost circumference to the inner circumference and the other large head directed from the innermost circumference to the outer circumference, a disc of two optical heads can be obtained. , The sum of the relative velocities between the two can always be constant. As described above, in this embodiment, the data transfer rate for each head in recording or reproduction is changed in proportion to the radial position of the optical disk in which the optical head is located. By doing so, a constant transfer rate can be apparently always obtained.
さらに、スパイラルディスクの表裏両面を同時再生す
るような場合、従来の光ディスクではスパイラルの向き
が同じであるため、スパイラルにそった記録を行なうこ
とを考えると、表面では内周から外周に向いているとす
れば裏面では外周から内周に向いていることになる。し
たがって本実施例のようなヘッドの移動を行なえば複数
トラックにわたる連続記録においてもトラックジャンプ
動作をせずにすむ。Furthermore, in the case where both sides of the spiral disk are reproduced simultaneously, the direction of the spiral is the same in the conventional optical disk. Therefore, considering recording along the spiral, the surface is directed from the inner circumference to the outer circumference. In this case, the rear surface faces from the outer periphery to the inner periphery. Therefore, if the head is moved as in this embodiment, the track jump operation is not required even in continuous recording over a plurality of tracks.
第２図および第３図は本実施例に使用する光ディスク
の断面構造の例を示す。第２図においては基板14上に記
録層15を設けた。ディスクを接着層16により粘合せたも
ので、従来主に用いられている両面光ディスクの構造で
ある。第３図においては一つの記録層15′を基板14′に
よってサンドイッチ構成としたものである、表裏どちら
かでも同じ記憶層に記録再生が可能である。2 and 3 show examples of the cross-sectional structure of the optical disk used in this embodiment. In FIG. 2, a recording layer 15 is provided on a substrate 14. This is a structure of a double-sided optical disk, which is a disk in which disks are adhered to each other with an adhesive layer 16, and which is mainly used conventionally. In FIG. 3, one recording layer 15 'is sandwiched by a substrate 14', and recording and reproduction can be performed on the same storage layer on either side.
以上の実施例では１組の光ヘッドについての例のみ示
したが、２組以上の光ヘッドで同時に記録再生を行って
もよい。In the above embodiments, only one set of optical heads has been described, but two or more sets of optical heads may simultaneously perform recording and reproduction.
以上説明したように本発明は表裏両面に対向して設け
られた２の光ヘッドと光ディスクとの相対移動速度を加
えた和が常に一定になるようにしてデータの転送レート
を一定に保つことができる効果がある。As described above, according to the present invention, it is possible to keep the data transfer rate constant so that the sum of the sum of the relative movement speeds of the two optical heads and the optical disk provided on both sides is always constant. There is an effect that can be done.
第１図は本発明の一実施例を示す図、第２図および第３
図は本実施例に用いる光ディスクの例を示す図である。 11……光ディスク、12……回転モータ、13a,13b……光
ヘッド、14,14′……基板、15,15′……記録層、16……
接着層、17a,17b……スクリューネジ、18a,18b……平歯
車、19……送りモータ。FIG. 1 is a view showing an embodiment of the present invention, FIG. 2 and FIG.
The figure shows an example of an optical disk used in this embodiment. 11 optical disk, 12 rotary motor, 13a, 13b optical head, 14, 14 'substrate, 15, 15' recording layer, 16
Adhesive layer, 17a, 17b: Screw screw, 18a, 18b: Spur gear, 19: Feed motor.
Claims (1)
を有し、トラック上の記録線密度が略一定である、表裏
両面で記録または再生可能な光ディスクと、前記表裏両
面に対向して設けられた第１の光ヘッドおよび第２の光
ヘッドとを有する光ディスク装置において、前記光ディ
スクは常に一定の回転数で回転しており、第１の光ヘッ
ドが光ディスク最内周トラックにある場合には第２の光
ヘッドは光ディスク最外周トラックにあり、第１の光ヘ
ッドと光ディスク上のトラックとの間の回転方向におけ
る相対移動速度と、第２の光ヘッドと光ディスク上のト
ラックとの間の回転方向における相対移動速度とを加え
た和が常に一定となるように、２つの光ヘッドを光ディ
スク半径方向に移動して、２つの光ヘッドが同時に記録
または再生動作を行うようにしたことを特徴とする光デ
ィスク装置。An optical disk having concentric or spiral recording tracks and having a substantially constant recording linear density on the tracks and capable of recording or reproducing on both front and rear surfaces, and an optical disk provided opposite to the front and rear surfaces. In an optical disk device having one optical head and a second optical head, the optical disk is always rotating at a constant rotation speed, and when the first optical head is on the innermost track of the optical disk, the second The optical head is located on the outermost track of the optical disk, and has a relative moving speed in the rotational direction between the first optical head and the track on the optical disk, and a relative moving speed in the rotational direction between the second optical head and the track on the optical disk. The two optical heads are moved in the radial direction of the optical disk so that the sum of the movement speed and the sum is always constant. Optical disc apparatus according to claim was that the Migihitsuji.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62293321A JP2569627B2 (en) | 1987-11-20 | 1987-11-20 | Optical disk drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62293321A JP2569627B2 (en) | 1987-11-20 | 1987-11-20 | Optical disk drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01134766A JPH01134766A (en) | 1989-05-26 |
| JP2569627B2 true JP2569627B2 (en) | 1997-01-08 |
Family
ID=17793317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62293321A Expired - Lifetime JP2569627B2 (en) | 1987-11-20 | 1987-11-20 | Optical disk drive |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2569627B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04184782A (en) * | 1990-11-20 | 1992-07-01 | Matsushita Electric Ind Co Ltd | Optical disc apparatus |
| JP2733398B2 (en) * | 1991-11-13 | 1998-03-30 | シャープ株式会社 | Optical disk drive |
| JPH0660566A (en) * | 1992-08-06 | 1994-03-04 | Nec Corp | Method for driving optical head for optical disk device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5730146A (en) * | 1981-01-09 | 1982-02-18 | Sharp Corp | Pickup device of longitudinal record player |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60102757U (en) * | 1983-12-14 | 1985-07-13 | 山水電気株式会社 | disk player |
-
1987
- 1987-11-20 JP JP62293321A patent/JP2569627B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5730146A (en) * | 1981-01-09 | 1982-02-18 | Sharp Corp | Pickup device of longitudinal record player |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01134766A (en) | 1989-05-26 |
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