JPS63214924A - Optical reproducing device - Google Patents
Optical reproducing deviceInfo
- Publication number
- JPS63214924A JPS63214924A JP4814487A JP4814487A JPS63214924A JP S63214924 A JPS63214924 A JP S63214924A JP 4814487 A JP4814487 A JP 4814487A JP 4814487 A JP4814487 A JP 4814487A JP S63214924 A JPS63214924 A JP S63214924A
- Authority
- JP
- Japan
- Prior art keywords
- photodetector
- output
- reflected light
- adder
- sub
- 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.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 title claims description 13
- 230000006866 deterioration Effects 0.000 abstract description 5
- 238000009792 diffusion process Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は情報トラックに記録された情報を光を用いて再
生する光学式再生装置に関するものであるＯ
従来の技術
第３図は従来から用いられ、本発明にも適用される光学
式再生装置の構成である。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an optical reproducing device that uses light to reproduce information recorded on an information track. This is the configuration of an optical reproducing device that is also applied to the present invention.
１は情報が記録された記録媒体、２は記録媒体１に記録
された情報を再生するための光源、３は光源２からの光
と、記録媒体１で反射された光を分離するビームスプリ
ッタ、４は記録媒体１の情報を正確に再生するためＫ、
フォーカス及びトラッキング方向に可動の対物レンズを
内蔵するアクチュエータ、６はフォーカス制御回路７と
トラッキング制御回路８を動作させるためのフォーカス
・トラッキングエラー検出光学系、６は記録媒体１から
の反射光を電気信号に変換する光検出器、７はアクチュ
エータ４を動かしてフォーカスを合わせるフォーカス制
御回路、８はアクチュエータ４を動かして、記録媒体１
に記録された情報列を正しく読むためのトラッキング制
御回路、９は記録媒体１から得た情報を再生する再生回
路である。1 is a recording medium on which information is recorded; 2 is a light source for reproducing the information recorded on the recording medium 1; 3 is a beam splitter that separates the light from the light source 2 and the light reflected by the recording medium 1; 4 is K in order to accurately reproduce the information on the recording medium 1;
An actuator having a built-in objective lens movable in the focus and tracking directions; 6 a focus/tracking error detection optical system for operating the focus control circuit 7 and the tracking control circuit 8; 6 converting the reflected light from the recording medium 1 into an electrical signal; 7 is a focus control circuit that moves the actuator 4 to focus; 8 is a focus control circuit that moves the actuator 4 to focus the recording medium 1;
9 is a tracking control circuit for correctly reading the information string recorded on the recording medium 1; and 9 is a reproducing circuit for reproducing the information obtained from the recording medium 1.
第４図は従来の光検出器の構成の一例である。FIG. 4 shows an example of the configuration of a conventional photodetector.
第４図ａは１ビーム用光検出器で、１０は通常反射光を
電気信号に変換する主光検出器、１１は何らかの原因で
拡散した反射光を電気信号に変換する副光検出器である
。Figure 4a shows a single-beam photodetector, 10 is a main photodetector that normally converts reflected light into an electrical signal, and 11 is a sub-photodetector that converts reflected light that has been diffused for some reason into an electrical signal. .
第４図すは３ビーム用光検出器で、１２は主光検出器、
１３はトラッキングエラー検出のための副ビーム用光検
出器である。Figure 4 shows a 3-beam photodetector, 12 is the main photodetector,
13 is a sub-beam photodetector for tracking error detection.
以下図面を参照しながら、１ビ一ム方式を例にとり、光
学式再生装置の構成と従来の光検出器及び周辺回路の一
例について説明する。The configuration of an optical reproducing apparatus and an example of a conventional photodetector and peripheral circuit will be described below with reference to the drawings, taking a one-beam system as an example.
光源２から出た光は、ビームスプリッタ３を通って、ア
クチュエータ４に内蔵された対物レンズにより、記録媒
体１上に集束する。Light emitted from a light source 2 passes through a beam splitter 3 and is focused onto a recording medium 1 by an objective lens built into an actuator 4.
ここで反射した光は再びアクチュエータ４を通り、ビー
ムスプリッタ３で光源２からの光と分離されて、フォー
カス・トラッキングエラー検出光学系６を通り、通常、
主光検出器１ｏに照射され、電気信号に変換される。The reflected light passes through the actuator 4 again, is separated from the light from the light source 2 by the beam splitter 3, passes through the focus/tracking error detection optical system 6, and normally
The light is irradiated onto the main photodetector 1o and converted into an electrical signal.
変換された電気信号をフォーカス制御回路７及びトラッ
キング制御回路８で各々処理して、アクチュエータ４を
駆動する。The converted electrical signals are processed by a focus control circuit 7 and a tracking control circuit 8, respectively, to drive the actuator 4.
又、変換された電気信号を同一の比率で加算し、再生回
路９で処理して情報を再生する。Further, the converted electrical signals are added at the same ratio and processed by the reproducing circuit 9 to reproduce information.
発明が解決しようとする問題点
しかしながら、前記の構成では、記録媒体１の記録面が
指紋等で汚れている等の理由で反射光が拡散してその一
部が副光検出器１１の外側に出た場合、加算された出力
信号は通常よシも低いレベルになるという問題点がある
。Problems to be Solved by the Invention However, in the above configuration, the reflected light is diffused due to reasons such as the recording surface of the recording medium 1 being dirty with fingerprints, etc., and a part of it is outside the sub-photodetector 11. There is a problem in that when the output signal is output, the added output signal has a lower level than usual.
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に、主光検出器の出
力より副光検出器の出力が犬となる比率で加算する加算
器を設け、前記再生回路に入力される加算器出力の劣化
を補償するものである。Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides an adder that adds the output of the sub-photodetector at a ratio that makes the output of the main photodetector equal to the output of the main photodetector. This compensates for the deterioration of the input adder output.
作用
本発明は前記の構成により、主光検出器及び副光検出器
の外側に出た反射光の分を補償することができ、再生回
路に入力される信号の劣化がおさえられ、記録媒体の記
録面が指紋等で汚れている等で前記の反射光の拡散が生
じても、より正確な信号再生が可能となる。Effect of the present invention With the above-described configuration, it is possible to compensate for the amount of reflected light emitted to the outside of the main photodetector and the sub-photodetector, suppressing deterioration of the signal input to the reproduction circuit, and improving the quality of the recording medium. Even if the above-described diffusion of reflected light occurs because the recording surface is dirty with fingerprints or the like, more accurate signal reproduction is possible.
又、前記の電気信号を使用するフォーカス・トラッキン
グ制御回路もより正確なアクチュエータの駆動が可能と
なる。Furthermore, the focus/tracking control circuit that uses the above-mentioned electrical signals can also drive the actuator more accurately.
実施例
第１図は本発明の一実施例の光学式再生装置の光検出器
及び周辺部のブロック図である。第２図は本発明の光検
出器の一実施例の平面図である。Embodiment FIG. 1 is a block diagram of a photodetector and peripheral parts of an optical reproducing apparatus according to an embodiment of the present invention. FIG. 2 is a plan view of an embodiment of the photodetector of the present invention.
第１図において、１ｏは主光検出器、１１は副光検出器
である。１５〜１８は主光検出器出力の加算比率を決め
るアンプ、１ｅは副光検出器出力の加算比率を決めるア
ンプである。２ｏは加算器であって１５〜１９の出力を
加算して出力を得る。In FIG. 1, 1o is a main photodetector, and 11 is a sub-photodetector. Reference numerals 15 to 18 are amplifiers that determine the addition ratio of the outputs of the main photodetector, and 1e is an amplifier that determines the addition ratio of the outputs of the auxiliary photodetector. 2o is an adder which adds the outputs of 15 to 19 to obtain an output.
７はフォーカス制御回路、８はトラッキング制御回路、
９は再生回路であって、２０の出力を各々処理して所望
の出力を得る。7 is a focus control circuit, 8 is a tracking control circuit,
Reference numeral 9 denotes a reproducing circuit which processes each of the 20 outputs to obtain a desired output.
第３図に示す光学式再生装置において光源２から出た光
は、ビームスプリッタ３、アクチェエータ４を通って記
録媒体１上に集束される。ここで反射された光は再びア
クチェエータ４を通り、ビームスプリッタ３で光源２か
らの光と分離されてフォーカス・トラッキングエラー検
出光学系５を通り、光検出器６に照射される。In the optical reproducing apparatus shown in FIG. 3, light emitted from a light source 2 passes through a beam splitter 3 and an actuator 4 and is focused onto a recording medium 1. The reflected light passes through the actuator 4 again, is separated from the light from the light source 2 by the beam splitter 3, passes through the focus/tracking error detection optical system 5, and is irradiated onto the photodetector 6.
第２図に示す主光検出器１０及び副光検出器１１で構成
されている光検出器６に照射された前記の反射光は電気
信号に変換される。もし反射光が拡散して、一部が光検
出器６の外側に照射されたならば、第１図に示す加算比
率を決めるアンプ１６〜１９の出力が減少して、その結
果加算器２ｏの出力レベルが低下する。ここでアンプ１
６〜１８の加算比率をＲ，、アンプ１９の加算比率をＲ
３とし、Ｒ，／Ｒ，）１とすることにより、反射光拡散
時において副光検出器１１の外側に拡散された反射光に
よるアンプ１９の出力レベル劣化を補償することができ
、Ｒ♂／ＲＡＯ値を適当に選ぶことによって加算器２ｏ
の出力を拡散の影響を余り受けずほぼ一定に保つことが
できる。The reflected light irradiated onto the photodetector 6, which is composed of a main photodetector 10 and a sub-photodetector 11 shown in FIG. 2, is converted into an electrical signal. If the reflected light is diffused and a part of it is irradiated to the outside of the photodetector 6, the outputs of the amplifiers 16 to 19 that determine the addition ratio shown in FIG. Output level decreases. here amp 1
The addition ratio of 6 to 18 is R, and the addition ratio of amplifier 19 is R.
3 and R, /R, )1, it is possible to compensate for the deterioration in the output level of the amplifier 19 due to the reflected light diffused outside the sub-photodetector 11 when the reflected light is diffused, and R♂/ By choosing the RAO value appropriately, the adder 2o
The output can be kept almost constant without being affected by diffusion.
本発明は１ビ一ム方式のみならず、第２図すに示す３ビ
一ム方式でも同様の構成で実施することができる。The present invention can be implemented not only in a 1-beam system but also in a 3-beam system shown in FIG. 2 with a similar configuration.
発明の効果
以上述べてきたように、極めて簡易な回路構成で、記録
媒体に記録された信号のより正確な再生と、より正確な
アクチュエータの駆動が可能となり、実用的に極めて有
用である。Effects of the Invention As described above, with an extremely simple circuit configuration, it is possible to more accurately reproduce signals recorded on a recording medium and more accurately drive an actuator, which is extremely useful in practice.
第１図は本発明の一実施例における光学式再生装置の要
部を示すブロック図、第２図は同検出器の平面図、第３
図は一般の光学式再生装置のブロック図、第４図は同光
検出器の平面図である。
１・・・・・・記録媒体、２・・・・・・光源、３・・
・・・・ビームスプリッタ、４・・・・・・アクチュエ
ータ、６・・・・・・フォーカス・トラッキングエラー
検出光学系、６・・・・・・光検出器、７・・・・・・
フォーカス制御回路、８・・・・・・トラッキング制御
回路、９・・・・・・再生回路、１０・・・・・・１ビ
ーム用主光検出器、１１・・・・・・１ビーム用副光検
出器、１２・・・・・・３ビーム用主光検出器、１３・
・・・・・３ビーム副ビーム用光検出器、１４・・・・
・・３ビーム用副光検出器、１５〜１８・・・・・・主
光検出器用アンプ、１９・・・・・・副光検出器用アン
プ、２ｏ・・・・・・加算器。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第１
図
１θ−主尤検上器
／７−ＩＪＵ鴫
第２図
ｔ−ｔ、ａ媒体
？−九源
３−ピームスブソリタ
４−アクチュエータ
６−光重も上器
！FIG. 1 is a block diagram showing the main parts of an optical reproducing device according to an embodiment of the present invention, FIG. 2 is a plan view of the same detector, and FIG.
The figure is a block diagram of a general optical reproducing device, and FIG. 4 is a plan view of the same photodetector. 1...Recording medium, 2...Light source, 3...
...Beam splitter, 4...Actuator, 6...Focus/tracking error detection optical system, 6...Photodetector, 7...
Focus control circuit, 8...Tracking control circuit, 9...Reproduction circuit, 10...Principal light detector for 1 beam, 11...For 1 beam Secondary photodetector, 12... Main photodetector for 3 beams, 13.
...3-beam sub-beam photodetector, 14...
... Sub-photodetector for 3 beams, 15-18... Amplifier for main photodetector, 19... Amplifier for sub-photodetector, 2o... Adder. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 1 θ-Main likelihood detector/7-IJU 2nd figure t-t, a medium? -Kyugen 3-Peams Suborita 4-Actuator 6-Mitsuju is also great!
Claims (1)
た情報を含む光を電気信号に変換する第１の光検出器と
、前記第１の光検出器を囲むように配置され、かつ拡散
された光を電気信号に変換する第２の光検出器と、前記
第１の光検出器の出力より前記第２の光検出器の出力が
大となる比率で前記第１の光検出器の出力と前記第２の
光検出器の出力を加算する加算器を設けたことを特徴と
する光学式再生装置。a first photodetector that converts information-containing light reflected from a recording medium on which information is recorded on an information track into an electrical signal; a second photodetector that converts light into an electrical signal; and an output of the first photodetector at a ratio such that the output of the second photodetector is larger than the output of the first photodetector. An optical reproducing device characterized in that an adder is provided to add the outputs of the second photodetector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62048144A JP2589688B2 (en) | 1987-03-03 | 1987-03-03 | Optical playback device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62048144A JP2589688B2 (en) | 1987-03-03 | 1987-03-03 | Optical playback device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63214924A true JPS63214924A (en) | 1988-09-07 |
| JP2589688B2 JP2589688B2 (en) | 1997-03-12 |
Family
ID=12795156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62048144A Expired - Fee Related JP2589688B2 (en) | 1987-03-03 | 1987-03-03 | Optical playback device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2589688B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60217537A (en) * | 1984-04-12 | 1985-10-31 | Toshiba Corp | Tracking error signal generation circuit |
-
1987
- 1987-03-03 JP JP62048144A patent/JP2589688B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60217537A (en) * | 1984-04-12 | 1985-10-31 | Toshiba Corp | Tracking error signal generation circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2589688B2 (en) | 1997-03-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |