JPH0756705B2 - Optical information recording / reproducing method - Google Patents
Optical information recording / reproducing methodInfo
- Publication number
- JPH0756705B2 JPH0756705B2 JP59275172A JP27517284A JPH0756705B2 JP H0756705 B2 JPH0756705 B2 JP H0756705B2 JP 59275172 A JP59275172 A JP 59275172A JP 27517284 A JP27517284 A JP 27517284A JP H0756705 B2 JPH0756705 B2 JP H0756705B2
- Authority
- JP
- Japan
- Prior art keywords
- recording
- light beam
- optical
- reproducing
- card
- 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 - Fee Related
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Description
【発明の詳細な説明】 〔技術分野〕 本発明は光学的情報記録再生方法に関し、特にカード状
の光学的情報記録媒体に用いる方法に関する。TECHNICAL FIELD The present invention relates to an optical information recording / reproducing method, and more particularly to a method used for a card-shaped optical information recording medium.
本発明において光学的情報基録再生方法とは、前記の如
き媒体に情報を記録する方法、媒体に記録された情報を
再生する方法および記録と再生とを両方共行なう方法を
示す。In the present invention, the optical information recording / reproducing method refers to a method of recording information on the medium as described above, a method of reproducing information recorded on the medium, and a method of performing both recording and reproduction.
従来、光を用いて情報を記録し、また記録された情報を
読出す媒体の形態としてデイスク状、カード状、テープ
状等各種のものが知られている。これらの内、カード状
に形成された光学的記録媒体（以下光カードと称す）
は、小型・軽量で持ち運びに便利な大記憶容量の媒体と
して、大きな需要が見込まれている。2. Description of the Related Art Conventionally, various types of media, such as a disc, a card, and a tape, are known as a form of a medium for recording information using light and reading the recorded information. Of these, an optical recording medium formed into a card (hereinafter referred to as an optical card)
Is expected to be in great demand as a medium with a large storage capacity that is small, lightweight and convenient to carry.
上記の光カードは、記録情報に従つて変調され、微小ス
ポツトに絞つた光ビームで、カード上に予め設定された
記録トラツクを走査することによつて、光学的に検出可
能な記録ピツト例として情報が記録される。この際、記
録ピツト列の交叉等のトラブルを生ずる事なく、正確に
情報を記録していく為には、前記光ビームの照射位置を
走査方向と垂直な方向で制御（オートトラツキング、以
下ATと称す）する必要があつた。また、光ビームをカー
ド上に正確に合焦させる為、焦点制御（オートフオーカ
シング、以下AFと称す）も行なわれた。従つて、前記記
録トラツクからトラツキング信号、フオーカシング信号
を得る為に、前記変調された光ビームは、最小のレベル
においてもカード上で書き込みが行なわれない程度の所
定のパワーを有するように設定されていた。また、記録
された情報を再生する場合には、光カードに情報が書き
込まれないレベルの一定パワーの光ビームで、前述の記
録ピツト列を走査することによつて行なつていた。The above optical card is an example of a recording pit that can be optically detected by scanning a preset recording track on the card with a light beam that is modulated according to the recording information and is focused on a minute spot. Information is recorded. At this time, in order to accurately record information without causing trouble such as crossing of recording pit rows, the irradiation position of the light beam is controlled in a direction perpendicular to the scanning direction (auto tracking, hereinafter referred to as AT Need to). In addition, focus control (autofocusing, hereinafter referred to as AF) was also performed in order to accurately focus the light beam on the card. Therefore, in order to obtain the tracking signal and the focusing signal from the recording track, the modulated light beam is set to have a predetermined power such that writing is not performed on the card even at the minimum level. It was Further, when the recorded information is reproduced, the above-mentioned recording pit row is scanned with a light beam having a constant power level at which the information is not written on the optical card.
一方、上記の如き光カードの情報再生手段は、記録又は
再生の動作時に光カードと光ビームとを相対的に移動さ
せることにより、光ビームの走査を行なつていた。ま
た、光カード上の記録トラツクは複数本の直線状に設け
られている為、上記走査は間欠的に行なわれ、非動作時
には光ビームを静止状態で待機させていた。On the other hand, the information reproducing means of the optical card as described above scans the optical beam by relatively moving the optical card and the optical beam during the recording or reproducing operation. Further, since the recording tracks on the optical card are provided in a plurality of straight lines, the above scanning is performed intermittently, and the light beam is made to stand by in a stationary state when not in operation.
ところが、このような従来の装置において、光ビームの
静止状態が長時間続くと、前述のような書き込みが行な
われないレベルの光ビームにおいても、エネルギーの蓄
積によつて誤信号が書き込まれてしまう場合があつた。
このような誤信号はやはり光ビームによつて検出され、
トラツクアクセスなどの際に大きな支障となつた。However, in such a conventional device, if the stationary state of the light beam continues for a long time, an erroneous signal is written due to energy accumulation even in the light beam at a level where writing as described above is not performed. There were cases.
Such false signals are still detected by the light beam,
This was a major obstacle when accessing the track.
本発明の目的は、かかる従来装置の欠点を解決し、光ビ
ームの停止時の誤信号の書き込みを防止し、常に正確な
記録又は再生動作の可能な光学的情報記録再生方法を提
供することにある。An object of the present invention is to solve the drawbacks of the conventional device, to prevent the writing of an erroneous signal when the light beam is stopped, and to provide an optical information recording / reproducing method capable of always performing an accurate recording or reproducing operation. is there.
本発明の上記目的は、カード状光学的情報記録媒体に光
ビームを照射すると共に前記媒体を往復運動させながら
情報を記録または再生する光学的情報記録再生方法にお
いて、前記光ビームと前記媒体との相対速度がゼロにな
ってから一定時間以上経過した後に前記光ビームのの前
記媒体上への照射を停止させることによつて達成され
る。The above object of the present invention is to provide an optical information recording / reproducing method of recording or reproducing information while irradiating a card-shaped optical information recording medium with a light beam and reciprocating the medium. This is achieved by stopping the irradiation of the light beam onto the medium after a certain time or more has elapsed since the relative velocity became zero.
以下、図面を用いて本発明の実施例を詳細に説明する。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
第２図は本発明の装置に用いる光カードの一例を示す概
略平面図である。図中、１は光カード、２は光カード上
に複数本の直線状に形成された記録トラツク、３は所定
速度で光ビームが走査される記録トラツクのデータ記録
エリア、4,4′は所望トラツクの検索がなされるトラツ
ク選択エリア、５は光ビームのホームポジシヨンであ
る。光ビームは最初ホームポジシヨン５に静止してい
る。記録又は再生の際には、まず光ビームはトラツク選
択エリア４をａ方向に移動し、記録又は再生しようとす
るＮ番目のトラツク２を見つける。そして、光ビームは
トラツク２上のデータ記録エリア３を矢印Ｃ方向に走査
し、記録又は再生を行なう。記録又は再生が終了する
と、光ビームはトラツク選択エリア４′内で停止し、次
に記録又は再生を行なうまでの間静止状態で待機され
る。記録又は再生の指令がくると、この光ビームは、次
に記録又は再生すべきトラツク（例えばＮ＋１番目のト
ラツク）に選択エリア４′内を矢印ａ方向に移動し、こ
のトラツクのデータ記録エリア３を矢印ｂ方向に走査
し、同様に記録又は再生が行なわれる。そして、この動
作を繰り返すことによつて、所定量のデータが記録又は
再生される。FIG. 2 is a schematic plan view showing an example of an optical card used in the device of the present invention. In the figure, 1 is an optical card, 2 is a recording track formed in a plurality of linear shapes on the optical card, 3 is a data recording area of a recording track in which a light beam is scanned at a predetermined speed, and 4 and 4'are desired. A track selection area 5 in which a track is searched is a home position of a light beam. The light beam is initially stationary at home position 5. At the time of recording or reproducing, the light beam first moves in the track selection area 4 in the a direction to find the Nth track 2 to be recorded or reproduced. Then, the light beam scans the data recording area 3 on the track 2 in the direction of arrow C for recording or reproduction. When the recording or reproduction is completed, the light beam stops in the track selection area 4'and stands by until the next recording or reproduction is performed. When a recording or reproducing command comes, this light beam moves in the direction of arrow a in the selected area 4'for the next recording or reproducing track (for example, the (N + 1) th track), and the data recording area 3 for this track. Is scanned in the direction of arrow b, and recording or reproduction is similarly performed. Then, by repeating this operation, a predetermined amount of data is recorded or reproduced.
第３図は、記録及び再生時の光ビームの光カード上での
パワーを説明する図で、夫々（Ａ）は記録時、（Ｂ）は
再生時である。また、図の横軸はトラツク上の位置、縦
軸は光パワーＰを示す。記録時に光ビームは、（Ａ）の
ようにデータ記録エリアに対応する走査範囲EWにおい
て、記録ピツトが形成されず、またトラツキング信号及
びフオーカシング信号を得る為に必要な最小限のパワー
PWLで常に光カードに照射される。そして記録信号に応
じて、記録に必要なだけのパワーPWHとの間で変調さ
れ、パワーPWHで照射された部分にのみ記録ピツトが形
成される。また、再生時にも走査範囲ERにおいて記録ピ
ツトが形成されない一定パワーPRで光ビームが照射さ
れ、前述の記録ピツトが読み取られる。FIG. 3 is a diagram for explaining the power of the light beam on the optical card during recording and reproduction, (A) during recording and (B) during reproduction, respectively. Further, the horizontal axis of the figure shows the position on the track, and the vertical axis shows the optical power P. At the time of recording, the light beam does not form a recording pit in the scanning range E W corresponding to the data recording area as shown in (A), and also has the minimum power required to obtain the tracking signal and the focusing signal.
PWL always illuminates the optical card. Then, according to the recording signal, it is modulated with the power P WH required for recording, and the recording pit is formed only on the portion irradiated with the power P WH . Further, during reproduction, the light beam is emitted at a constant power P R where the recording pits are not formed in the scanning range E R , and the above-mentioned recording pits are read.
ここで、通常光カードの記録感度Ｓは、光ビームの照射
パワーＰと照射時間Ｔで決定される。従つて、第４図の
ように光ビームのスポツトが６′から６へ相対速度Ｖで
走査される場合、スポツト径をφとすると、Ｖがφ/T以
上であれば記録されない。ところが、前述のように光ビ
ームが静止状態で待機している場合、この状態が長時間
続くと、たとえば光パワーが上記の如くPWL或いはPRで
あつても誤記録されてしまう。本発明においては、この
ような静止状態の時間を計測し、誤記録される前に光ビ
ームの照射を停止してしまうものである。Here, the recording sensitivity S of the normal optical card is determined by the irradiation power P of the light beam and the irradiation time T. Therefore, when the spot of the light beam is scanned from 6'to 6 at a relative velocity V as shown in FIG. 4, if the spot diameter is φ, V is not recorded if V / φ or more. However, as described above, when the light beam is standing by in a stationary state, if this state continues for a long time, for example, the optical power is erroneously recorded even if it is P WL or P R as described above. In the present invention, the time of such a stationary state is measured and the irradiation of the light beam is stopped before erroneous recording.
第１図は、本発明に基づく光学的情報記録再生の一実施
例を示す概略図である。ここで、１は第２図の如き光カ
ードで、ベルト20に固定された載置台17上に載置されて
いる。ベルト24はプーリ19,18にかけわたされ、モータ2
1によつて矢印ｄ方向に移動し、これに伴つて、光カー
ド１もｄ方向に移動する。従つて、光カード１面におい
ては、光ヘツド16から照射される光ビーム32は第２図の
ｂ或いはｃ方向に走査される。光ヘッド16は半導体レー
ザ11,コリメータレンズ12,ビームスプリツタ13,対物レ
ンズ14及び光検出器15とから構成される。前記の光ビー
ム32は半導体レーザ11から射出し、対物レンズ14で光カ
ード１上に微小スポツトとして集光される。また、この
光ビーム32の光カードによる反射光は、再び対物レンズ
14を通り、ビームスプリツタ13で入射光と分離されて光
検出器15で検出される。この光検出器15で検出された信
号は、信号復調回路22、トラツキング制御回路23、フオ
ーカス制御回路24に送られ、フオーカス制御回路24及び
トラツキング制御回路23は、対物レンズ14を夫々光軸方
向及び光軸と垂直な方向に動かし、AFとATとを行なう。FIG. 1 is a schematic view showing an embodiment of optical information recording / reproducing based on the present invention. Here, 1 is an optical card as shown in FIG. 2, which is mounted on a mounting table 17 fixed to a belt 20. The belt 24 is wound around the pulleys 19 and 18, and the motor 2
By 1, the optical card 1 moves in the direction of arrow d, and along with this, the optical card 1 also moves in the direction of d. Therefore, on the surface of the optical card 1, the light beam 32 emitted from the optical head 16 is scanned in the b or c direction in FIG. The optical head 16 is composed of a semiconductor laser 11, a collimator lens 12, a beam splitter 13, an objective lens 14, and a photodetector 15. The light beam 32 is emitted from the semiconductor laser 11 and is converged as a minute spot on the optical card 1 by the objective lens 14. In addition, the reflected light of the light beam 32 from the optical card is returned to the objective lens.
After passing through 14, it is separated from the incident light by the beam splitter 13 and detected by the photodetector 15. The signal detected by the photodetector 15 is sent to the signal demodulation circuit 22, the tracking control circuit 23, and the focus control circuit 24, and the focus control circuit 24 and the tracking control circuit 23 cause the objective lens 14 to move in the optical axis direction and respectively. Move in the direction perpendicular to the optical axis to perform AF and AT.
28はステツピングモータで、光ヘッド16を紙面垂直方向
に動かし、これによつて第２図ａ方向に光ビームの照射
位置を移動させる。前記モータ21は、モータ駆動回路25
によつて制御され、光カードの移動、停止を行なう。ま
たモータ21の駆動速度は、速度検知回路29によつて検知
され、この速度検知回路29は時間計測回路30を介して、
半導体レーザ11を駆動するレーザ駆動回路31に接続され
ている。更に、信号復調回路22、ステツピングモータ2
8、モータ駆動回路25、レーザ駆動回路31は夫々インタ
ーフエイス26を介して、中央処理装置（CPU）27に接続
されている。A stepping motor 28 moves the optical head 16 in the direction perpendicular to the plane of the drawing, thereby moving the irradiation position of the light beam in the direction of FIG. The motor 21 includes a motor drive circuit 25.
The optical card is moved and stopped. Further, the drive speed of the motor 21 is detected by a speed detection circuit 29, and this speed detection circuit 29, via a time measurement circuit 30,
It is connected to a laser drive circuit 31 that drives the semiconductor laser 11. Furthermore, the signal demodulation circuit 22, the stepping motor 2
8. The motor drive circuit 25 and the laser drive circuit 31 are connected to a central processing unit (CPU) 27 via an interface 26, respectively.
この装置において、記録又は再生の動作を行なう場合に
は、CPU27の制御によつて、モータ21およびステツピン
グモータ28が駆動され、第２図で説明したように光ビー
ムがデータ記録エリア３を走査する。このとき半導体レ
ーザ11からの光ビーム32は、光カード上で常に第３図P
WL或いはPRのパワーを有し、記録時には更に端子C1から
入力する記録信号に従つてパワーPWHとの間で変調がな
される。また、再生時には端子C2から再生信号が出力さ
れる。動作が終了すると、モータ21は停止し、光ビーム
はパワーPWL或いはPRを有したまま静止状態で待機され
る。モータ21が停止すると速度検知回路29は光カードと
光ビームとの相対速度Ｖが零になつたことを検知し、時
間計測回路30を働かせる。ここで時間計測回路30には、
所定の時間TOFFが設定されており、前記Ｖ＝０となつて
からの時間ｔが、TOFFと等しくなつたときには、照射停
止信号をレーザ駆動回路31に送り、半導体レーザ11の発
光を停止する。もしｔ＜TOFFの間に、次の動作が開始さ
れ、Ｖ＝０となれば、時間計測装置はリセツトされる。
前述の光パワーPWL或いはPRの静止光ビームで記録がな
される時間をTSとするとTOFFはTOFF＜TSに設定される
（例えばTOFF＝TS/2）。また、この設定時間TOFFを光カ
ードの記録感度に合せて、外部の切り換えスイツチで段
階的に、或いはボリユーム等で連続的に変化可能に構成
しても良い。In this apparatus, when recording or reproducing operation is performed, the motor 21 and the stepping motor 28 are driven by the control of the CPU 27, and the light beam scans the data recording area 3 as described with reference to FIG. To do. At this time, the light beam 32 from the semiconductor laser 11 is always shown on the optical card in FIG.
It has a power of WL or P R , and at the time of recording, it is further modulated with the power P WH according to the recording signal input from the terminal C 1 . Also, during reproduction, a reproduction signal is output from the terminal C 2 . When the operation is completed, the motor 21 is stopped, and the light beam is kept standing still while having the power P WL or P R. When the motor 21 stops, the speed detection circuit 29 detects that the relative speed V between the optical card and the light beam has become zero, and activates the time measurement circuit 30. Here, in the time measuring circuit 30,
When the predetermined time T OFF is set and the time t after V = 0 is equal to T OFF , an irradiation stop signal is sent to the laser drive circuit 31 to stop the emission of the semiconductor laser 11. To do. If the next operation is started during t <T OFF and V = 0, the time measuring device is reset.
T OFF is set to T OFF <T S (T OFF = T S / 2), where T S is the time for recording with the stationary light beam having the optical power P WL or P R described above. In addition, the set time T OFF may be configured to be changeable stepwise by an external switching switch or continuously by a volume or the like in accordance with the recording sensitivity of the optical card.
本発明は、前述の実施例に限らず種々の変形が可能であ
る。例えば、実施例では光ビームの静止状態をモータか
ら直接検知したが、光カードの動作を制御するCPUから
の信号に従つて計時を開始するように構成しても良い。
また光検出器から読み出される信号によつて速度検知を
行なつてもかまわない。更に、本発明は、前述のような
記録及び再生を行なう装置だけでなく、記録専用装置、
再生専用装置にも適用が可能である。The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, in the embodiment, the stationary state of the light beam is directly detected from the motor, but the clock may be started according to the signal from the CPU controlling the operation of the optical card.
Further, the speed may be detected by the signal read from the photodetector. Further, the present invention is not limited to the recording and reproducing apparatus as described above, but a recording-only apparatus,
It can also be applied to a reproduction-only device.
以上説明したように、本発明の光学的情報記録再生方法
は、光ビームと記録媒体との相対速度がゼロになってか
ら一定時間以上経過した後に、前記光ビームの前記媒体
上への照射を停止させているので、動作の待機状態にお
いて誤つて記録がなされないようにし、トラツク検索時
等の誤動作を防止する効果を有する。また、非動作時の
長時間に亘る無駄な発光がなくなるので、半導体レーザ
等の光源の長寿命化、消費電力の省力化にもつながる。
更に、本発明は、事故等によつて光ビームの走査が停止
してしまつた時にも、誤記録を防ぐ効果を有する。As described above, in the optical information recording / reproducing method of the present invention, irradiation of the light beam onto the medium is performed after a certain time or more has elapsed since the relative velocity between the light beam and the recording medium became zero. Since the recording is stopped, it is possible to prevent erroneous recording in the operation standby state and to prevent an erroneous operation such as a track search. In addition, since unnecessary light emission for a long time during non-operation is eliminated, it is possible to extend the life of the light source such as a semiconductor laser and save the power consumption.
Further, the present invention has an effect of preventing erroneous recording even when the scanning of the light beam is stopped due to an accident or the like.
第１図は本発明の光学的情報記録再生装置の一実施例を
示す概略構成図、第２図は本発明の装置に用いる光カー
ドの一例を示す概略平面図、第３図（Ａ）、（Ｂ）は夫
々記録時及び再生時の光カード上の光パワーを説明する
図、第４図は光カード上で光ビームのスポツトが走査さ
れる様子を示す模式図である。 １……光カード 11……半導体レーザ 21……モータ 29……速度検知回路 30……時間計測回路 31……レーザ駆動回路FIG. 1 is a schematic configuration diagram showing an embodiment of an optical information recording / reproducing apparatus of the present invention, FIG. 2 is a schematic plan view showing an example of an optical card used in the apparatus of the present invention, FIG. 3 (A), (B) is a diagram for explaining the optical power on the optical card at the time of recording and reproducing, respectively, and FIG. 4 is a schematic diagram showing how the spot of the light beam is scanned on the optical card. 1 …… Optical card 11 …… Semiconductor laser 21 …… Motor 29 …… Speed detection circuit 30 …… Time measurement circuit 31 …… Laser drive circuit
───────────────────────────────────────────────────── フロントページの続き (72)発明者 鈴木 健一 神奈川県川崎市中原区今井上町53番地 キ ヤノン株式会社小杉事業所内 (72)発明者 臼井 正幸 東京都大田区下丸子３丁目30番２号 キヤ ノン株式会社内 (72)発明者 松岡 宏 東京都大田区下丸子３丁目30番２号 キヤ ノン株式会社内 (72)発明者 松岡 和彦 東京都大田区下丸子３丁目30番２号 キヤ ノン株式会社内 (72)発明者 細谷 英樹 東京都大田区下丸子３丁目30番２号 キヤ ノン株式会社内 (72)発明者 青木 昭夫 東京都大田区下丸子３丁目30番２号 キヤ ノン株式会社内 (72)発明者 箕浦 一雄 東京都大田区下丸子３丁目30番２号 キヤ ノン株式会社内 (56)参考文献 特開 昭52−67302（ＪＰ，Ａ) 特開 昭59−40376（ＪＰ，Ａ) 特開 昭60−50637（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenichi Suzuki, 53 Imaiue-cho, Nakahara-ku, Kawasaki-shi, Kanagawa 53, Kosugi Plant, Canon Inc. (72) Masayuki Usui, 3-30-2 Shimomaruko, Ota-ku, Tokyo Non Inc. (72) Inventor Hiroshi Matsuoka 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Kazuhiko Matsuoka 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Hideki Hosoya 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Akio Aoki 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Invention Kazuo Minoura 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (56) References JP-A-52-67302 (JP, A) Akira 59-40376 (JP, A) JP Akira 60-50637 (JP, A)
Claims (1)
照射すると共に前記媒体を往復運動させながら情報を記
録または再生する光学的情報記録再生方法において、前
記光ビームと前記媒体との相対速度がゼロになってから
一定時間以上経過した後に、前記光ビームの前記媒体上
への照射を停止させることを特徴とする光学的情報記録
再生方法。1. An optical information recording / reproducing method for recording or reproducing information while irradiating a card-shaped optical information recording medium with a light beam and reciprocating the medium, the relative velocity between the light beam and the medium. A method for recording / reproducing optical information, characterized in that the irradiation of the light beam onto the medium is stopped after a lapse of a certain time or more from the time when the value becomes zero.
Priority Applications (10)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59275172A JPH0756705B2 (en) | 1984-12-29 | 1984-12-29 | Optical information recording / reproducing method |
| GB08531770A GB2172138A (en) | 1984-12-29 | 1985-12-24 | Optical recording-reproducing apparatus |
| DE19853546067 DE3546067A1 (en) | 1984-12-29 | 1985-12-24 | RECORDING / PLAYBACK DEVICE FOR OPTICAL INFORMATION |
| DE3546718A DE3546718C2 (en) | 1984-12-29 | 1985-12-24 | |
| CA000498689A CA1267725A (en) | 1984-12-29 | 1985-12-27 | Optical information recording-reproducing apparatus and method |
| FR858519290A FR2580413B1 (en) | 1984-12-29 | 1985-12-27 | OPTICAL INFORMATION RECORDING-REPRODUCING APPARATUS |
| CH5555/85A CH665043A5 (en) | 1984-12-29 | 1985-12-30 | APPARATUS FOR RECORDING AND REPRODUCING OPTICAL INFORMATION. |
| US07/166,802 US4912697A (en) | 1984-12-29 | 1988-03-03 | Apparatus and method for preventing recording errors due to a reduction in the relative speed between an information carrying light beam and a recording medium |
| US07/399,719 US5010534A (en) | 1984-12-29 | 1989-08-29 | Optical information recording-reproducing apparatus |
| FR9007160A FR2646546B1 (en) | 1984-12-29 | 1990-06-08 | METHOD FOR OPTICALLY RECORDING AND / OR REPRODUCING INFORMATION ON A CARD-LIKE MEDIUM |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59275172A JPH0756705B2 (en) | 1984-12-29 | 1984-12-29 | Optical information recording / reproducing method |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1260701A Division JPH07105049B2 (en) | 1989-10-04 | 1989-10-04 | Optical information recording / reproducing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61158034A JPS61158034A (en) | 1986-07-17 |
| JPH0756705B2 true JPH0756705B2 (en) | 1995-06-14 |
Family
ID=17551669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59275172A Expired - Fee Related JPH0756705B2 (en) | 1984-12-29 | 1984-12-29 | Optical information recording / reproducing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0756705B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5059774A (en) * | 1987-10-15 | 1991-10-22 | Ricoh Company, Ltd. | Seek and track control for a rectangular optical card handling apparatus |
| JPH04141836A (en) * | 1990-10-01 | 1992-05-15 | Canon Inc | Optical information recording and reproducing device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6057135B2 (en) * | 1975-12-01 | 1985-12-13 | 松下電器産業株式会社 | optical recording and reproducing device |
| JPS5940376A (en) * | 1982-08-31 | 1984-03-06 | Toshiba Corp | Disk record reproducer |
-
1984
- 1984-12-29 JP JP59275172A patent/JPH0756705B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61158034A (en) | 1986-07-17 |
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