JPH01112533A - Optical disk device - Google Patents
Optical disk deviceInfo
- Publication number
- JPH01112533A JPH01112533A JP62268912A JP26891287A JPH01112533A JP H01112533 A JPH01112533 A JP H01112533A JP 62268912 A JP62268912 A JP 62268912A JP 26891287 A JP26891287 A JP 26891287A JP H01112533 A JPH01112533 A JP H01112533A
- Authority
- JP
- Japan
- Prior art keywords
- power
- optical disk
- light
- light amount
- output voltage
- 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
- 230000003287 optical effect Effects 0.000 title claims abstract description 50
- 239000004065 semiconductor Substances 0.000 abstract description 15
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 206010041662 Splinter Diseases 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
Landscapes
- Optical Head (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は自らの反射率データを記録した光ディスクのデ
ータを用いて光ディスクへの入射光量パワーの最適制御
を可能とした光ディスク装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical disc device that is capable of optimally controlling the amount and power of light incident on an optical disc using data on an optical disc that records its own reflectance data.
第２図は従来の装置（コンパクトディスク読本、昭和５
７年１１月２５日オーム社発行）を示すブロック図であ
り、図中１は光学ヘッド、２は光量制御系、Ｄは光ディ
スクを示している。Figure 2 shows a conventional device (compact disc reader, 1930).
(Published by Ohmsha, November 25, 2007) In the figure, 1 is an optical head, 2 is a light amount control system, and D is an optical disk.
光学へソド１は半導体レーザ１１の一方の臂開面から発
せられたレーザビームをカップリングレンズ１２、偏光
ビームスプリンタ１３．１７４波長板１４、対物レンズ
１５を経て光ディスク２に投射せしめ、またこれからの
反射光を対物レンズ１５．１７４波、長板１４、偏光ビ
ームスプリフタ１３を経て光検出３１６に導き、光ディ
スクＤに対する記録、またその再生をおこなうようにな
っている。The optical head 1 projects the laser beam emitted from one of the open faces of the semiconductor laser 11 onto the optical disk 2 through the coupling lens 12, the polarizing beam splinter 13, the 174 wavelength plate 14, and the objective lens 15. The reflected light is guided to a photodetector 316 through an objective lens 15, 174 waves, a long plate 14, and a polarizing beam splitter 13, and recorded on and reproduced from the optical disk D.
そして半導体レーザ１１の反対側の臂開面から出射され
るレーザビームは受光素子１７にて捉え、比較回路２４
の一方の入力端子に入力する。比較回路２４の他方の入
力端子には切換スイッチ２３の切換操作によって再生時
には読出しパワー設定電ａｉＸ２１からの出力電圧が、
また記録時には書込みパワー設定電源２２からの出力電
圧が選択的に人力され、夫々受光素子１７を通じて入力
された発光光量パワーに相当する信号と比較され、その
差を解消するに必要な光量パワー制御信号を光量パワー
制御回路２５から半導体レーザ１１へ出力させ、半導体
レーザ１１からの発光光量パワーが記録、再生夫々に適
した値となるよう制御が行われるようになっている。The laser beam emitted from the arm opening on the opposite side of the semiconductor laser 11 is captured by the light receiving element 17, and the comparison circuit 24
input to one of the input terminals. The other input terminal of the comparator circuit 24 receives the output voltage from the read power setting voltage aiX 21 during playback by switching the changeover switch 23.
Also, during recording, the output voltage from the write power setting power supply 22 is selectively manually inputted and compared with a signal corresponding to the emitted light amount power inputted through the respective light receiving elements 17, and a light amount power control signal necessary to eliminate the difference is generated. is output from the light quantity power control circuit 25 to the semiconductor laser 11, and control is performed so that the light quantity power of the light emitted from the semiconductor laser 11 becomes a value suitable for each of recording and reproduction.
ところでこのような従来装置にあっては半導体レーザ１
１から発せられる発光光量パワーが予め定めた書込みパ
ワー設定電源２２、読出しパワー設定電源２１からの出
力電圧に相応した値となっているか否かを監視すること
によって記録、再生夫々に応じた適正な入射光量パワー
値が得られているか否かを判断しているが、この監視対
象としている光量パワーは半導体レーザ１１の臂開面近
（での光量パワーに過ぎず、記録、再生に必要な光ディ
スク０面に対する直接的な入射光量パワーではない。By the way, in such a conventional device, the semiconductor laser 1
By monitoring whether the amount of light emitted from the power source 1 corresponds to the predetermined output voltages from the write power setting power source 22 and the read power setting power source 21, the power can be adjusted appropriately for recording and playback. It is judged whether the incident light amount power value is obtained or not, but the light amount power that is being monitored is only the light amount power near the arm opening of the semiconductor laser 11, and the optical disk necessary for recording and playback. It is not the direct incident light amount power to the zero surface.
即ち、半導体レーザ１１から光ディスクＤに至る間には
カップリングレンズ１２等の光学系が存在するため、半
導体レーザ１１から出射された発光光量パワーが適正値
であっても光ディスク０面における入射光量パワーが必
ずしも適正値であるとは限らないという問題があった。In other words, since there is an optical system such as the coupling lens 12 between the semiconductor laser 11 and the optical disk D, even if the emitted light amount power emitted from the semiconductor laser 11 is an appropriate value, the incident light amount power on the 0th surface of the optical disk is There was a problem that the value was not necessarily an appropriate value.
本発明はかかる事情に鑑みなされたものであってその目
的とするところは光ディスクの媒体面において必要とさ
れる適正な記録、再生のための入射光量パワーを設定す
ることを可能とした光ディスク装置を提供するにある。The present invention has been made in view of the above circumstances, and its purpose is to provide an optical disc device that makes it possible to set the incident light amount and power for proper recording and reproduction required on the medium surface of an optical disc. It is on offer.
本発明に係る光ディスク装置にあっては光ディスクに予
めそれ自体の光の反射率データを記録しておき、記録、
再生時に光ディスクから反射率データを読み出すと共に
、光ディスクから反射された光量パワーを検出し、反射
率データ及び反射光量パワーに基づき光ディスクへの入
射光量パワーを求め、予め定めた適正値と比較し、適正
な読出し、書込み光量パワーを得べく光ビーム用光源に
対する発光光量パワーの制御を行う。In the optical disc device according to the present invention, the optical disc has its own light reflectance data recorded in advance, and the recording and
During playback, reflectance data is read from the optical disc, the amount of light reflected from the optical disc is detected, the amount of light incident on the optical disc is determined based on the reflectance data and the amount of reflected light, and the power is compared with a predetermined appropriate value. The power of the light emitted by the light source for the light beam is controlled in order to obtain the appropriate reading and writing light power.
本発明にあってはこれによって光ディスクに入射する光
量パワーを直接求め、これを適正値とすべく光ビーム用
光源に対する発光光量パワー制御が可能となる。According to the present invention, it is thereby possible to directly obtain the power of the light amount incident on the optical disk and to control the power of the light emitted by the light source for the light beam in order to make it an appropriate value.
以下本発明をその実施例を示す図面に基づき具体的に説
明する。第１図は本発明に係る光ディスク装置（以下本
発明装置という）のブロック図であり、図中１は光学ヘ
ッド、２は光量制御系、Ｄは光ディスクを示している。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on drawings showing embodiments thereof. FIG. 1 is a block diagram of an optical disk device according to the present invention (hereinafter referred to as the device of the present invention), in which 1 indicates an optical head, 2 indicates a light amount control system, and D indicates an optical disk.
光ディスクＤにはそのディスク製造時に自らの反射率を
含むデータが内周部又は外周部に定めた制御データ記録
領域に、例えばピット状に記録せしめである。光学ヘッ
ド１にあっては半導体レーザ１１の一方の臂開面から発
せられたレーザビームは半導体レーザ１１の光軸と一致
させて配設しであるカップリングレンズ１２、偏光ビー
ムスプリッタ１３．１７４波長板１４、対物レンズ１５
を通して光ディスクＤに投射せしめて光ディスクＤへの
記録を行い、またこの光ディスクＤからの反射光を対物
レンズ１５．１７４波長板１６、偏光ビームスプリフタ
１３を経て光検出器１６に導き記録の再生及び前記反射
率データの再生を行うようになっている。When the optical disc D is manufactured, data including its own reflectance is recorded in a control data recording area defined at the inner or outer periphery in the form of, for example, a pit. In the optical head 1, the laser beam emitted from one arm opening of the semiconductor laser 11 is connected to a coupling lens 12, which is arranged to coincide with the optical axis of the semiconductor laser 11, and a polarizing beam splitter 13, which has a wavelength of 174. Plate 14, objective lens 15
The reflected light from the optical disk D is guided to the photodetector 16 through the objective lens 15, 174 wavelength plate 16, and polarization beam splitter 13 for reproduction of the recording and recording on the optical disk D. The reflectance data is reproduced.
光検出器１６の出力である再生信号は再生信号処理回路
２６に入力され、所定の処理を施されてデータ読出回路
２７及びＡ／Ｄ （アナログ／ディジタル）コンバータ
２８へ出力される。The reproduced signal output from the photodetector 16 is input to a reproduced signal processing circuit 26, subjected to predetermined processing, and outputted to a data reading circuit 27 and an A/D (analog/digital) converter 28.
データ続出回路２７は入力された再生信号に基づき光デ
ィスクＤに書き込まれた情報をコードデータに再生し、
また反射率データ等のデータ再生を行い、反射率データ
はこれを反射率データメモリ２９にストアする。The data succession circuit 27 reproduces the information written on the optical disc D into code data based on the input reproduction signal,
Further, data such as reflectance data is reproduced and the reflectance data is stored in the reflectance data memory 29.
またＡ／Ｄコンバータ２８は光ディスクＤにおける無記
録領域の再生信号、換言すれば反射光量パワーを、ディ
ジタル信号化してパワーデータメモリ３０ヘスドアする
。Further, the A/D converter 28 converts the reproduction signal of the non-recorded area on the optical disc D, in other words, the reflected light amount power, into a digital signal and sends it to the power data memory 30.
３１はパワー演算回路であって、反射率データメモリ２
９からここにストアされている反射率データを、またパ
ワーデータメモリ３０からここにストアされている反射
光量パワーを夫々読み出し、光ディスク０面に対する入
射光量パワーＣを下式に従って演算する。31 is a power calculation circuit, and a reflectance data memory 2
The reflectance data stored here is read from 9 and the reflected light amount power stored here is read from the power data memory 30, respectively, and the incident light amount power C with respect to the 0th surface of the optical disk is calculated according to the following formula.
Ｃ＝Ｋ −Ａ／Ｂ
但し、Ｋ：変換定数
Ａ：反射光量パワー
Ｂ：反射率データ
パワー演算回路３１には予め光ディスクＤからの読出し
に適した適正（望ましくは最適）読出し光量パワーＲ１
並びに光ディスクＤへの書込みに適した適正（望ましく
は最適）＠込み光量パワーＷが夫々入力されており、算
出した入射光量パワーＣを、読み出し時には読出し光量
パワーＲと、また書込み時には書込み光量パワーＷと夫
々比較する。そして入射光量パワーＣを読出し光量パワ
ーＲに一致させるに必要な読出し設定電源２１に対する
制御量を演算して、これに相応する出力電圧が得られる
よう読出し設定電源２１を補正する。C=K −A/B However, K: Conversion constant A: Reflected light amount power B: Reflectance data The power calculation circuit 31 has an appropriate (preferably optimal) readout light amount power R1 suitable for reading from the optical disc D in advance.
In addition, the appropriate (preferably optimal) @writing light amount power W suitable for writing to the optical disk D is input, and the calculated incident light amount power C is used as the read light amount power R when reading, and the writing light amount power W when writing. Compare each. Then, the control amount for the readout setting power source 21 necessary to make the incident light amount power C match the readout light amount power R is calculated, and the readout setting power source 21 is corrected so that an output voltage corresponding to this is obtained.
また入射光量パワーＣを書込み光量パワーＷに一致させ
るに必要な書込み設定電源２２に対する制′ａ量を演算
して、同様にこれに相応する出力電圧が得られるよう書
込み設定電源２２に補正する。In addition, the amount of constraint a required for the write setting power source 22 to make the incident light amount power C match the writing light amount power W is calculated, and the write setting power source 22 is similarly corrected so that an output voltage corresponding to this is obtained.
光ディスクＤからの読出し時、又は光ディスクＤへの書
込み時には夫々パワー演算回路３１からの信号に基づき
切換スイッチ２３を切換え操作し、読出し時には読出し
設定電源２１がらの出力電圧を、また書込み時には書込
み設定電源２２からの出力電圧を夫々比較回路２４の一
方の入力端子に選択的入力せしめる。When reading from the optical disc D or writing to the optical disc D, the changeover switch 23 is operated based on the signal from the power calculation circuit 31, and the output voltage from the read setting power supply 21 is set at the time of reading, and the output voltage from the write setting power supply is set at the time of writing. The output voltages from 22 are selectively input to one input terminal of a comparator circuit 24, respectively.
比較回路２４の他方の入力端子には従来と同様に半導体
レーザ１１の他の臂開面からのレーザビームをモニタ用
として受光素子１７にて光電変換した値が入力されてい
る。比較回路２４は読出し設定電源２１又は書込み設定
電源２２の出力電圧と受光素子１７からの電圧とを比較
し、一致していれば光量パワー制御回路２５からそのま
まの光量パワー制御信号を引続いて、また一致していな
いときは半導体レーザ１１の発光光量パワーが読出し設
定電源２１又は書込み設定電源２２の出力電圧に相応す
る値と一致するよう光量パワー制御回路２５から半導体
レーザ１１に発光光量パワー制御信号を出力する。The other input terminal of the comparator circuit 24 receives a value obtained by photoelectrically converting the laser beam from another open face of the semiconductor laser 11 by the light receiving element 17 for monitoring, as in the conventional case. The comparison circuit 24 compares the output voltage of the read setting power source 21 or the write setting power source 22 with the voltage from the light receiving element 17, and if they match, it continues to receive the light amount power control signal as it is from the light amount power control circuit 25. If they do not match, a light emission power control circuit 25 sends a light emission power control signal to the semiconductor laser 11 so that the light emission power of the semiconductor laser 11 matches the value corresponding to the output voltage of the read setting power supply 21 or the write setting power supply 22. Output.
前述した如き一連の操作は経時変化がない場合には光デ
ィスクＤを記録再生装置に装着したときのみ補正係数を
求め、事後はその補正係数に基づいて定めた値を書込み
光量パワー、読出し光量パワーとして用いればよい。In the above-mentioned series of operations, if there is no change over time, the correction coefficient is calculated only when the optical disc D is installed in the recording/reproducing device, and after the fact, the values determined based on the correction coefficient are used as the writing light amount power and the reading light amount power. Just use it.
一方補正を定常的に行う場合は、例えば記録時には光デ
ィスクＤ上の１セクタ毎に書込み光量パワーチエツクエ
リアを設け、記録開始直前に所定のタイミングで当該チ
エツクエリア内にテスト光量パワーを出射し、補正係数
をユーザデータの記録直前に求めて書込み設定電源２２
の出力電圧補正を行い各セクタへの記録を最適の光量パ
ワーで行い得るようにしてもよい。On the other hand, if correction is to be performed regularly, for example, during recording, a write light amount power check area is provided for each sector on the optical disc D, and a test light amount power is emitted into the check area at a predetermined timing just before the start of recording, and the correction is performed. Calculate and write coefficients immediately before recording user data Setting power source 22
The output voltage may be corrected so that recording in each sector can be performed with the optimum light amount and power.
なお上述の実施例では発光光量パワーの制御を記録又は
再生直前に行う場合につき説明したが、記録途中又は再
生途中に行ってもよいことは言うまでもない。In the above-described embodiments, the case where the control of the emitted light amount power is performed immediately before recording or reproduction has been described, but it goes without saying that the control may be performed during recording or reproduction.
以上の如く本発明装置にあっては光ディスクに予め記録
した反射率データと光ディスク面からの反射光量パワー
とにより直接光ディスク面への入射光量パワーを求め、
これを記録、再生夫々に応じて適正値に補正することが
できて高品質で信頼性の高い記録、再生を行い得るなど
本発明は優れた効果を奏するものである。As described above, in the apparatus of the present invention, the amount and power of the light incident on the optical disk surface is directly determined based on the reflectance data recorded in advance on the optical disk and the amount and power of the reflected light from the surface of the optical disk.
The present invention has excellent effects, such as being able to correct this to an appropriate value depending on recording and reproduction, and thus performing high quality and reliable recording and reproduction.
第１図は本発明装置のブロック図、第２図は従来装置の
ブロック図である。
１・・・光学ヘッド ２・・・光量制御系１１・・・半
導体レーザ １２・・・カップリングレンズ１３・・・
偏光ビームスプリンタ １４・・・１ノ４波長板１５・
・・対物レンズ １６・・・光検出器 １７・・・受光
素子２１・・・読出し設定電源 ２２・・・書込み設定
電源２３・・・切換スイッチ ２４・・・比較回路２５
・・・光量パワー制御回路 ２６・・・再生信号処理回
路２７・・・データ読出回路 ２８・・・Ａ／Ｄコンバ
ータ２９・・・反射率データメモリ
３０・・・パワーデータメモリ ３１・・・パワー演算
回路なお、図中、同一符号は同一、又は相当部分を示す
。FIG. 1 is a block diagram of an apparatus according to the present invention, and FIG. 2 is a block diagram of a conventional apparatus. 1... Optical head 2... Light amount control system 11... Semiconductor laser 12... Coupling lens 13...
Polarizing beam splinter 14...1/4 wavelength plate 15.
...Objective lens 16...Photodetector 17...Light receiving element 21...Reading setting power supply 22...Writing setting power supply 23...Selector switch 24...Comparison circuit 25
... Light quantity power control circuit 26 ... Reproduction signal processing circuit 27 ... Data readout circuit 28 ... A/D converter 29 ... Reflectance data memory 30 ... Power data memory 31 ... Power Arithmetic circuit In the figures, the same reference numerals indicate the same or corresponding parts.
Claims (1)
ムを前記光ディスク面に投射し、光ディスク面からの反
射光を捉えてその反射光量パワーを検出すると共に、前
記反射率を再生し、これらに基づいて光ディスク面への
入射光量パワーを算出し、該入射光量パワーを予め定め
てある適正な書込み又は読出し光量パワーと比較し、こ
の適正光量パワーに一致するよう前記光ビーム用光源の
発生光量パワーを制御する手段とを具備することを特徴
とする光ディスク装置。1. An optical disc on which its own reflectance has been recorded in advance, a light beam is projected onto the optical disc surface, the reflected light from the optical disc surface is captured, the amount and power of the reflected light is detected, the reflectance is reproduced, and the Based on this, the incident light amount power to the optical disk surface is calculated, the incident light amount power is compared with a predetermined appropriate writing or reading light amount power, and the generated light amount power of the light beam light source is adjusted to match this appropriate light amount power. An optical disc device comprising: means for controlling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62268912A JPH01112533A (en) | 1987-10-23 | 1987-10-23 | Optical disk device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62268912A JPH01112533A (en) | 1987-10-23 | 1987-10-23 | Optical disk device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01112533A true JPH01112533A (en) | 1989-05-01 |
Family
ID=17464995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62268912A Pending JPH01112533A (en) | 1987-10-23 | 1987-10-23 | Optical disk device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01112533A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990007180A1 (en) * | 1988-12-16 | 1990-06-28 | Sony Corporation | Optical disc recording/reproducing apparatus |
| EP0453308A2 (en) * | 1990-04-20 | 1991-10-23 | International Business Machines Corporation | Reducing amplitude variations of optical disk readback signals |
| US5515350A (en) * | 1989-11-02 | 1996-05-07 | Sharp Kabushiki Kaisha | Optical head with adjustable output power detector |
-
1987
- 1987-10-23 JP JP62268912A patent/JPH01112533A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990007180A1 (en) * | 1988-12-16 | 1990-06-28 | Sony Corporation | Optical disc recording/reproducing apparatus |
| US5515350A (en) * | 1989-11-02 | 1996-05-07 | Sharp Kabushiki Kaisha | Optical head with adjustable output power detector |
| EP0453308A2 (en) * | 1990-04-20 | 1991-10-23 | International Business Machines Corporation | Reducing amplitude variations of optical disk readback signals |
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