JP2001357539A - Information recording medium discriminating device - Google Patents
Information recording medium discriminating deviceInfo
- Publication number
- JP2001357539A JP2001357539A JP2000181591A JP2000181591A JP2001357539A JP 2001357539 A JP2001357539 A JP 2001357539A JP 2000181591 A JP2000181591 A JP 2000181591A JP 2000181591 A JP2000181591 A JP 2000181591A JP 2001357539 A JP2001357539 A JP 2001357539A
- Authority
- JP
- Japan
- Prior art keywords
- information recording
- recording medium
- laser
- dvd
- focus
- 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
Landscapes
- Signal Processing For Digital Recording And Reproducing (AREA)
- Optical Recording Or Reproduction (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Abstract
Description
【発明の属する技術分野】本発明は、装着されたディス
クの種類を判別する情報記録媒体判別装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording medium discriminating apparatus for discriminating the type of a loaded disc.
【従来の技術】現在、ＣＤ（Compact Disk）とＤＶＤ
（Digital Video Disk）を1台の再生装置で再生するＣ
Ｄ／ＤＶＤコンパチブル再生装置が市販されている。Ｃ
Ｄはディスクの表面から約１．２ｍｍの位置に情報が書
き込まれており、ＤＶＤは約０．６ｍｍの位置に書き込
まれている。情報記録面はアルミニウムなどが蒸着され
ており、反射率は約８０％である。透明ポリカーボネー
トなどの表面は約４％の反射率である。このような情報
記録面の位置の違いに着目してディスク種類を判別する
ことができる。対物レンズをディスクに所定の速度で近
づけていくと、まず、ディスクの表面に再生用レーザの
焦点が合わされた時に、上述した小さい反射率によって
強度の小さい反射光が得られる。その後、対物レンズを
さらにディスクに近づけていくと、ディスクの信号面に
再生用レーザの焦点が合わされた時に、信号面での反射
によって強度の大きい反射光が得られる。これら２箇所
の反射光が得られる時点の間の時間差は距離に比例する
ために、ディスクの種類を判別することが可能となる。
例えば、上述したように、ＤＶＤ／ＣＤでは表面から情
報記録面までの距離が夫々０．６ｍｍ／１．２ｍｍなの
で、予め判別のための閾値を設定しておくことにより、
上述した時間差がかかる閾値に比べて大きい場合に、装
着されているディスクがＣＤであると判別できる。ま
た、上述した時間差がかかる閾値に比べて小さい場合に
は、装着されているディスクがＤＶＤであると判別する
ことができる。2. Description of the Related Art At present, CD (Compact Disk) and DVD
(Digital Video Disk) with one playback device C
D / DVD compatible playback devices are commercially available. C
In D, information is written at a position of about 1.2 mm from the surface of the disk, and in DVD, information is written at a position of about 0.6 mm. The information recording surface is deposited with aluminum or the like, and has a reflectance of about 80%. Surfaces such as transparent polycarbonate are about 4% reflective. The disc type can be determined by focusing on such a difference in the position of the information recording surface. When the objective lens is moved closer to the disc at a predetermined speed, first, when the reproducing laser is focused on the surface of the disc, reflected light having a small intensity is obtained by the above-described small reflectance. Thereafter, when the objective lens is further brought closer to the disk, when the reproduction laser is focused on the signal surface of the disk, reflected light having a high intensity is obtained by reflection on the signal surface. Since the time difference between the time when these two reflected lights are obtained is proportional to the distance, it is possible to determine the type of the disc.
For example, as described above, in the case of DVD / CD, the distance from the front surface to the information recording surface is 0.6 mm / 1.2 mm, respectively.
When the time difference is larger than the threshold value, it can be determined that the loaded disk is a CD. When the time difference is smaller than the threshold value, it can be determined that the mounted disk is a DVD.
【発明が解決しようとする課題】しかしながら、上述し
たような方法は、光ピックアップのアクチュエータのフ
ォーカス方向の感度、すなわちアクチュエータを駆動す
るための信号とかかる信号に従ってなされるアクチュエ
ータのフォーカス方向の変位速度の対応関係がある程度
以上ばらついてしまう場合には正しい判別ができなくな
るという欠点を有している。この感度のばらつきは、例
えば量産される個々の装置間でのばらつき、各装置毎の
経時的な変化、およびアクチュエータ等の部品の動作の
温度特性等に起因して生じ、感度の最大値と最小値の差
異は、略２倍に達することがある。アクチュエータのフ
ォーカス方向の感度のばらつきが大きくなる程、対物レ
ンズ、再生用レーザ光の焦点位置および反射光が得られ
る時点についてもばらつきが大きくなり、従って上述し
たようにして実時間として検出される時間差についても
ばらつきが大きくなる。このような時間差のばらつきが
ある程度以上大きくなることにより、上述の方法におけ
る判別のための閾値をまたぐ時間差が検出されるような
場合には、判別の結果に誤りが生じるおそれがある。However, in the above-described method, the sensitivity in the focus direction of the actuator of the optical pickup, that is, the signal for driving the actuator and the displacement speed of the actuator in the focus direction made in accordance with the signal are determined. There is a drawback in that if the correspondence varies to some extent, correct determination cannot be made. This variation in sensitivity occurs due to, for example, variations between individual devices mass-produced, changes over time for each device, and temperature characteristics of operation of components such as actuators. The difference in the values can reach almost twice. As the variation in the sensitivity in the focus direction of the actuator increases, the variation also increases with respect to the objective lens, the focal position of the reproducing laser beam, and the time at which the reflected light is obtained, and thus the time difference detected as real time as described above. Also has large variations. If the variation of the time difference is increased to a certain extent or more and a time difference that exceeds the threshold value for the determination in the above-described method is detected, an error may occur in the determination result.
【課題を解決するための手段】本発明の情報記録媒体判
別装置はかかる点に鑑みなされたもので、表面から情報
記録面までの距離が異なる２種類の情報記録媒体をその
距離に対応する所定の閾値により判別する情報記録媒体
判別装置であって、前記情報記録媒体に照射されるレー
ザの焦点をフォーカス方向に所定の速度で移動させるフ
ォーカス移動手段と、前記焦点の位置に基づき前記情報
記録媒体の表面と記録面を検出する検出手段と、一方の
情報記録媒体と他方の情報記録媒体に於ける前記レーザ
の焦点が前記表面の検出位置から前記情報記録面の最初
の検出位置まで移動する移動時間の比率Ｒを所定の固定
値として予め記憶する記憶手段と、閾値設定モードに於
いて、前記レーザの焦点が前記表面の検出位置から前記
情報記録面の最初の検出位置まで移動する時間を計測
し、一方の情報記録媒体に対し、該計測した値と前記比
率Ｒにて閾値を設定する制御手段を備える。SUMMARY OF THE INVENTION An information recording medium discriminating apparatus according to the present invention has been made in view of the above point, and it has been proposed that two types of information recording media having different distances from the front surface to the information recording surface be provided with a predetermined distance corresponding to the distance. An information recording medium discriminating device for discriminating based on a threshold value of the information recording medium, a focus moving means for moving a focus of a laser irradiated on the information recording medium at a predetermined speed in a focus direction, and the information recording medium based on a position of the focus. Detecting means for detecting the surface and the recording surface of the laser, and moving the focal point of the laser on one of the information recording media and the other information recording medium from the detection position on the surface to the first detection position on the information recording surface A storage means for storing in advance a time ratio R as a predetermined fixed value; Measures the time to move to the detection position, to one of the information recording medium, comprising control means for setting the threshold value by the value obtained by the measurement ratio R.
【発明の実施の形態】本発明の実施例の形態を図に基づ
き説明する。実施例の情報記録媒体判別装置は車載用の
ナビゲーション装置用の地図再生装置に使用される判別
装置である。地図再生装置には地図が記憶されたＤＶＤ
−ＲＯＭあるいはＣＤ−ＲＯＭのディスクが挿入され、
情報記録媒体判別装置は挿入されたディスクがＤＶＤ−
ＲＯＭであるかＣＤ−ＲＯＭであるかを判別する。図１
は、本発明の実施例の要部を示すブロック図である。
（１）はＤＶＤ−ＲＯＭあるいはＣＤ−ＲＯＭのディス
クである。ＤＶＤ−ＲＯＭはディスクの表面から約０．
６ｍｍの位置に情報が書き込まれており、ＤＶＤ−ＲＯ
Ｍはディスクの表面から約１．２ｍｍの位置に情報が書
き込まれている。（２）はターンテーブルであり、ディ
スク（１）を図示せぬクランプと挟持する。（３）はタ
ーンテーブル（２）を回転させるモータである。（４）
はレーザを放射するレーザダイオード（４１）、面に平
行な光の成分を通過させ面に垂直な光の成分を反射させ
る偏ビームスプリッタ（４２）、光を平行にするコリメ
ータレンズ（４３）、接眼レンズ（４４）、４つの領域
の光の強弱を検出する４分割センサ（４５）、スピーカ
と同様の原理で接眼レンズをディスク（１）の面に遠ざ
けたり近づけたりするフォーカス用のアクチュエータ
（４６）を有する。レーザダイオード（４１）から放射
されたレーザは、偏ビームスプリッタ（４２）によりデ
ィスク（１）方向に反射され、コリメータレンズ（４
３）により平行となり、対物レンズ（４４）により集光
されてディスク（１）に放射される。ディスク（１）で
反射されたレーザは、対物レンズ（４４）と偏ビームス
プリッタ（４２）を介して４分割センサ（４５）に照射
され、４つの領域の光度が検出される。このように、ピ
ックアップ（１）はディスク（１）に向けてレーザの焦
点を放射し、ディスク（１）により反射されたレーザの
光度を４つの領域に分けて検出する。そして、レーザの
焦点はフォーカス方向に移動可能である。（５）は和信
号増幅回路であり、ピックアップ（１）の４分割センサ
（４５）から出力される４つの領域の光度検出信号を合
計し、増幅する。この合計された信号によりレーザの反
射の光度を検出することができる。（６）はフォーカス
サーボ回路であり、フォーカス用のアクチュエータ（４
６）を駆動する。（７）は制御回路であり、ＲＯＭ
（８）に記憶されるプログラムに従って、レーザダイオ
ード（４１）のレーザ放射を制御したり、和信号増幅回
路（５）からの光度検出信号に基づきフォーカスサーボ
回路（６）の駆動を制御する。RAM（９）は不揮発メモ
リであり、制御回路（７）の動作に必要な情報を記憶す
る。次にＣＤ／ＤＶＤの判別方法について説明する。前
述のとおり、ＤＶＤ−ＲＯＭはディスクの表面から約
０．６ｍｍの位置、ＣＤ−ＲＯＭは約１．２ｍｍの位置
に情報が書き込まれており、この違いによりディスク
（１）を判別する。ディスク（１）の表面にレーザの焦
点を所定速度で近づけていくと、レーザの焦点がディス
ク（１）の表面に達したときに約４％の反射があり、情
報記録面に達したときに約８０％の反射がある。そこ
で、この反射により、挿入されたディスク（１）の表面
を検出してから記録面を検出するまでに要する時間を測
定し、設定されている閾値を超えるか否かでＣＤ／ＤＶ
Ｄの判別を行う。表面あるいは記録面の検出は、和信号
増幅回路（５）の出力が所定以上になったときに行われ
る。図２に示す如く、基準のＣＤの表面の検出位置から
情報記録面の検出位置までの所要時間をＴｃｄとし、Ｄ
ＶＤの所要時間をＴｄｖｄとする。そうすると、ＣＤ／
ＤＶＤを判定する閾値Ｔｔｈはこれらの中間の（Ｔｃｄ
＋Ｔｄｖｄ）／２となる。前述の如く、レーザの焦点の
フォーカス方向の変移速度は製品ごとにばらつくため
に、工場にて製品ごとに次の方法で閾値Ｔｔｈを設定す
る。図３は制御回路（７）の閾値設定動作を示すフロー
チャートである。制御回路（７）は、和信号増幅回路
（５）が基準ＣＤの表面を検出したときから情報記録面
を検出するまでの所要時間Ｔｃｄを計測する（Ｓ１）。
そして、図４の式１に示す如く、基準ＣＤの所要時間Ｔ
ｃｄと基準ＤＶＤの所要時間Ｔｄｖｄの比率Ｒ（Ｒ＝Ｔ
ｄｖｄ／Ｔｃｄ）（例えば、Ｒ＝２）を一定とみなす。
これにより、基準ＤＶＤの所要時間Ｔｄｖｄは実測しな
くても計算（Ｔｄｖｄ＝Ｒ×Ｔｃｄ）で求めることがで
きる。よって、図４の式２に示す如く、閾値Ｔｔｈ（Ｔ
ｔｈ＝Ｔｄｖｄ／２／（１＋１／Ｒ））を計算して、Ｒ
ＡＭ（９）に記憶させる（Ｓ２）。このように、本発明
は比率Ｒを固定値として、基準ＤＶＤの所要時間Ｔｄｖ
ｄを計測することなく閾値Ｔｔｈを設定する。尚、逆
に、基準ＤＶＤの所要時間Ｔｄｖｄを計測し、基準ＣＤ
の所要時間Ｔｃｄを計測せずに、閾値Ｔｔｈを図４の式
３（Ｔｔｈ＝ｄｖｄ／２（Ｒ＋１））で計算してもよ
い。ところで、本発明は比率Ｒを固定値とした。製品の
ばらつきにより、レーザの焦点のフォーカス方向の変移
速度が変化しても、表面から情報記録面まで移動する時
間の比率Ｒは速度変化が相殺されてほとんど変化しな
い。また、例え、加速度の差等により僅か変化しても、
距離の比率が2倍のものを判定するのに支障はない。図
４は制御回路（７）のＣＤ／ＤＶＤ判定動作を示すフロ
ーチャートである。制御回路（７）は、和信号増幅回路
（５）が挿入されたディスク（１）の表面を検出したと
きから情報記録面を検出するまでの所要時間Ｔを計測す
る（Ｓ１１）。計測した所要時間Ｔが閾値Ｔｔｈより小
さければＤＶＤと判定し（Ｓ１２のＹ，Ｓ１３）、Ｔｔ
ｈ以上であればＣＤと判定する（Ｓ１２のＮ，Ｓ１
４）。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. The information recording medium discriminating device of the embodiment is a discriminating device used for a map reproducing device for an in-vehicle navigation device. DVD with map stored in map playback device
-ROM or CD-ROM disc is inserted,
The information recording medium discriminating apparatus uses a DVD-
It is determined whether it is a ROM or a CD-ROM. FIG.
FIG. 1 is a block diagram showing a main part of an embodiment of the present invention.
(1) is a DVD-ROM or CD-ROM disc. The DVD-ROM is approximately 0.
Information is written at the position of 6mm, DVD-RO
For M, information is written at a position about 1.2 mm from the surface of the disk. (2) is a turntable which clamps the disc (1) with a clamp (not shown). (3) is a motor for rotating the turntable (2). (4)
Is a laser diode (41) that emits a laser, a polarized beam splitter (42) that passes light components parallel to the surface and reflects light components perpendicular to the surface, a collimator lens (43) that makes the light parallel, an eyepiece A lens (44), a four-divided sensor (45) for detecting the intensity of light in the four regions, and a focusing actuator (46) for moving the eyepiece away from or closer to the surface of the disk (1) by the same principle as a speaker. Having. The laser beam emitted from the laser diode (41) is reflected by the polarized beam splitter (42) in the direction of the disk (1), and is collimated by the collimator lens (4).
The light is made parallel by 3), collected by the objective lens (44), and emitted to the disk (1). The laser reflected by the disk (1) is irradiated to the four-divided sensor (45) via the objective lens (44) and the polarized beam splitter (42), and the luminous intensity of four areas is detected. Thus, the pickup (1) emits the laser focus toward the disk (1), and detects the luminous intensity of the laser reflected by the disk (1) in four regions. The focal point of the laser is movable in the focus direction. (5) is a sum signal amplifying circuit, which sums and amplifies luminous intensity detection signals of four regions output from the four-divided sensor (45) of the pickup (1). The luminous intensity of the reflection of the laser can be detected from this summed signal. (6) is a focus servo circuit, and a focus actuator (4)
6) is driven. (7) is a control circuit, a ROM
According to the program stored in (8), the laser emission of the laser diode (41) is controlled, and the drive of the focus servo circuit (6) is controlled based on the luminous intensity detection signal from the sum signal amplification circuit (5). The RAM (9) is a non-volatile memory, and stores information necessary for the operation of the control circuit (7). Next, a method of discriminating a CD / DVD will be described. As described above, information is written at about 0.6 mm from the surface of a DVD-ROM and about 1.2 mm from a CD-ROM. Disc (1) is identified based on this difference. When the laser focus approaches the surface of the disk (1) at a predetermined speed, when the laser focus reaches the surface of the disk (1), there is about 4% reflection. There is about 80% reflection. Then, by this reflection, the time required from the detection of the surface of the inserted disc (1) to the detection of the recording surface is measured, and the CD / DV is determined based on whether or not a set threshold is exceeded.
D is determined. The detection of the front surface or the recording surface is performed when the output of the sum signal amplifying circuit (5) exceeds a predetermined value. As shown in FIG. 2, the time required from the detection position on the reference CD surface to the detection position on the information recording surface is Tcd, and D
The required time of VD is Tdvd. Then, CD /
The threshold value Tth for judging a DVD is intermediate (Tcd
+ Tdvd) / 2. As described above, the threshold value Tth is set at the factory by the following method for each product in order to vary the speed of the focus of the laser in the focus direction for each product. FIG. 3 is a flowchart showing the threshold setting operation of the control circuit (7). The control circuit (7) measures a required time Tcd from when the sum signal amplifier circuit (5) detects the surface of the reference CD to when the information recording surface is detected (S1).
Then, as shown in equation 1 of FIG.
cd and the ratio R (R = T) of the required time Tdvd of the reference DVD.
dvd / Tcd) (eg, R = 2) is considered constant.
Thereby, the required time Tdvd of the reference DVD can be obtained by calculation (Tdvd = R × Tcd) without actually measuring it. Therefore, as shown in Expression 2 in FIG.
th = Tdvd / 2 / (1 + 1 / R)), and R
It is stored in the AM (9) (S2). Thus, according to the present invention, the ratio R is a fixed value, and the required time Tdv of the reference DVD is set.
The threshold value Tth is set without measuring d. Conversely, the required time Tdvd of the reference DVD is measured and the reference CD is measured.
, The threshold Tth may be calculated by Equation 3 (Tth = dvd / 2 (R + 1)) of FIG. 4 without measuring the required time Tcd. In the present invention, the ratio R is a fixed value. Even if the shift speed of the focus of the laser in the focus direction changes due to product variation, the ratio R of the time required to move from the surface to the information recording surface hardly changes because the speed change is offset. Also, even if it changes slightly due to a difference in acceleration, etc.,
There is no problem in judging that the ratio of the distance is twice. FIG. 4 is a flowchart showing the CD / DVD determination operation of the control circuit (7). The control circuit (7) measures a required time T from when the surface of the disc (1) in which the sum signal amplifying circuit (5) is inserted to when the information recording surface is detected (S11). If the measured required time T is smaller than the threshold value Tth, it is determined to be a DVD (Y in S12, S13), and Tt is determined.
h, it is determined to be a CD (N in S12, S1
4).
【発明の効果】上述の如く、本発明は、基準ＣＤの表面
検出から情報記録面検出までレーザの焦点が移動する所
要時間と基準ＤＶＤの所要時間の比率を固定値とする。
これにより、基準ＣＤか基準ＤＶＤの一方の所要時間を
計測するだけで、個々の情報記録媒体判別装置のＣＤ／
ＤＶＤ判定の閾値を設定することができる。As described above, in the present invention, the ratio of the time required for the laser focus to move from the detection of the surface of the reference CD to the detection of the information recording surface and the time required for the reference DVD is fixed.
Thus, only by measuring the required time of one of the reference CD and the reference DVD, the CD / CD of each information recording medium discriminating apparatus can be measured.
A threshold for DVD determination can be set.
【図１】本発明の要部を示すブロック図である。FIG. 1 is a block diagram showing a main part of the present invention.
【図２】ディスクの表面検出から情報記録面検出までレ
ーザの焦点が移動する所要時間を示す図である。FIG. 2 is a diagram showing a time required for a focal point of a laser to move from detection of a disk surface to detection of an information recording surface.
【図３】本発明の閾値設定の動作を示すフローチャート
である。FIG. 3 is a flowchart illustrating a threshold setting operation according to the present invention.
【図４】本発明の計算式を示す図である。FIG. 4 is a diagram showing a calculation formula of the present invention.
【図５】本発明のＣＤ／ＤＶＤ判定の動作を示すフロー
チャートである。FIG. 5 is a flowchart showing the operation of CD / DVD determination according to the present invention.
１ ディスク ４ ピックアップ ４１ レーザダイオード ４２ 偏ビームスプリッタ ４３ コリメータレンズ ４４ 接眼レンズ ４５ ４分割センサ ４６ アクチュエータ ５ 和信号増幅回路 ７ 制御回路 1 Disc 4 Pickup 41 Laser Diode 42 Polarized Beam Splitter 43 Collimator Lens 44 Eyepiece 45 Quadrant Sensor 46 Actuator 5 Sum Signal Amplifier 7 Control Circuit
フロントページの続き Ｆターム(参考） 5D044 BC03 CC06 DE03 DE12 DE17 DE23 DE29 DE39 DE54 GK18 5D090 AA01 BB02 CC09 CC12 CC18 DD03 FF05 FF08 GG02 GG17 GG36 HH01 JJ11 5D117 AA02 CC07 DD08 DD10 FF03Continued on the front page F term (reference) 5D044 BC03 CC06 DE03 DE12 DE17 DE23 DE29 DE39 DE54 GK18 5D090 AA01 BB02 CC09 CC12 CC18 DD03 FF05 FF08 GG02 GG17 GG36 HH01 JJ11 5D117 AA02 CC07 DD08 DD10 FF03
Claims (1)
２種類の情報記録媒体をその距離に対応する所定の閾値
により判別する情報記録媒体判別装置であって、 前記情報記録媒体に照射されるレーザの焦点をフォーカ
ス方向に所定の速度で移動させるフォーカス移動手段
と、前記焦点の位置に基づき前記情報記録媒体の表面と
記録面を検出する検出手段と、 一方の情報記録媒体と他方の情報記録媒体に於ける前記
レーザの焦点が前記表面の検出位置から前記情報記録面
の最初の検出位置まで移動する移動時間の比率Ｒを所定
の固定値として予め記憶する記憶手段と、 閾値設定モードに於いて、前記レーザの焦点が前記表面
の検出位置から前記情報記録面の最初の検出位置まで移
動する時間を計測し、一方の情報記録媒体に対し、該計
測した値と前記比率Ｒにて閾値を設定する制御手段を備
えたことを特徴とする情報記録媒体判別装置。1. An information recording medium discriminating apparatus for discriminating two types of information recording media having different distances from a surface to an information recording surface by a predetermined threshold value corresponding to the distance, wherein the information recording medium is irradiated. Focus moving means for moving the focal point of the laser at a predetermined speed in the focus direction; detecting means for detecting the surface and the recording surface of the information recording medium based on the position of the focal point; one information recording medium and the other information recording Storage means for previously storing, as a predetermined fixed value, a ratio R of a movement time during which the focal point of the laser on the medium moves from the detection position on the surface to the first detection position on the information recording surface; Measuring the time required for the focal point of the laser to move from the detection position on the surface to the first detection position on the information recording surface, and, for one information recording medium, the measured value An information recording medium discriminating apparatus, comprising: a control unit for setting a threshold value with the ratio R.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000181591A JP3600123B2 (en) | 2000-06-16 | 2000-06-16 | Information recording medium discriminating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000181591A JP3600123B2 (en) | 2000-06-16 | 2000-06-16 | Information recording medium discriminating device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001357539A true JP2001357539A (en) | 2001-12-26 |
| JP3600123B2 JP3600123B2 (en) | 2004-12-08 |
Family
ID=18682496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000181591A Expired - Fee Related JP3600123B2 (en) | 2000-06-16 | 2000-06-16 | Information recording medium discriminating device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3600123B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005022529A1 (en) | 2003-09-02 | 2005-03-10 | Koninklijke Philips Electronics N.V. | Disc drive apparatus, and method for recognizing cd and dvd |
| JP2008097756A (en) * | 2006-10-13 | 2008-04-24 | Kenwood Corp | Optical disk drive |
| CN101128876B (en) * | 2005-01-20 | 2011-06-08 | 卓然公司 | Optical disc machine and its operation method |
-
2000
- 2000-06-16 JP JP2000181591A patent/JP3600123B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005022529A1 (en) | 2003-09-02 | 2005-03-10 | Koninklijke Philips Electronics N.V. | Disc drive apparatus, and method for recognizing cd and dvd |
| US7480222B2 (en) | 2003-09-02 | 2009-01-20 | Koninklijke Philips Electronics N.V. | Disc drive apparatus, and method for recognizing CD and DVD |
| CN101128876B (en) * | 2005-01-20 | 2011-06-08 | 卓然公司 | Optical disc machine and its operation method |
| JP2008097756A (en) * | 2006-10-13 | 2008-04-24 | Kenwood Corp | Optical disk drive |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3600123B2 (en) | 2004-12-08 |
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