JP2005327441A - Optical disk and optical disk device - Google Patents

Optical disk and optical disk device Download PDF

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JP2005327441A
JP2005327441A JP2005116158A JP2005116158A JP2005327441A JP 2005327441 A JP2005327441 A JP 2005327441A JP 2005116158 A JP2005116158 A JP 2005116158A JP 2005116158 A JP2005116158 A JP 2005116158A JP 2005327441 A JP2005327441 A JP 2005327441A
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signal
optical disc
photodetector
guide groove
address
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JP4331139B2 (en
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Seiji Nishiwaki
青児 西脇
Hiroyuki Yamaguchi
博之 山口
Hironori Deguchi
博紀 出口
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk and optical disk device which can surely read an address signal even in an area to which recording mark is overlapped with an address prepit. <P>SOLUTION: The optical disk has guide grooves 5G formed along a circumferencial direction forming a cycle of a pitch p in a radial direction of disk-like substrate, and a prepit formed between the guide grooves along the guide groove, and is constituted so that the address signals assigned to each position of signal face are represented by arrangement of the prepit in accordance with the prescribed rule. The prepit is constituted of a pair of prepits 5A and 5B as a unit formed in both sides of a guide groove respectively. Positions of a pair of prepits are shifted mutually along with the circumferencial direction, and the distance between each of end edges inside between both prepits within end edges of a pair of prepits in circumferencial direction is equal or less than the pitches p of the guide groove. The optical disk device detects return light from optical disks of the above configuration, computes a phase difference signal and uses it for detection of the address signal. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、情報を記録する媒体として用いられる光ディスク、および光ディスクへ情報を記録し再生するための光ディスク装置に関するものである。   The present invention relates to an optical disc used as a medium for recording information, and an optical disc apparatus for recording and reproducing information on the optical disc.

光ディスクの信号面における番地信号を検出するための従来の技術として、例えば、非特許文献１に記載されたものが知られている。この従来技術に関し、これを簡略化して図示した図１０から図１２を参照して説明する。   As a conventional technique for detecting an address signal on the signal surface of an optical disc, for example, one described in Non-Patent Document 1 is known. This prior art will be described with reference to FIGS. 10 to 12 which are simplified and shown.

図１０（ａ）は、従来例に於ける光ディスク装置の要部構成図である。図１０（ｂ）は、光ディスク信号面上を光スポットが走査する様子を示す平面図である。図１０（ｃ）は、光検出器上における光スポット検出の形態を示す平面図である。図１０（ｄ）は、光検出器上における他の光スポット検出の形態を示す平面図である。   FIG. 10A is a block diagram of the main part of an optical disc apparatus in a conventional example. FIG. 10B is a plan view showing a state in which a light spot scans on the optical disc signal surface. FIG.10 (c) is a top view which shows the form of the light spot detection on a photodetector. FIG.10 (d) is a top view which shows the form of the other light spot detection on a photodetector.

図１０（ａ）に於いて、光源１を出射する出射光はビームスプリッタ２を透過し、コリメートレンズ３により平行光となり、対物レンズ４により光ディスク基材５の光ディスク信号面（以下、信号面と称す）５Ｓ上に集光されて、集束光６となる。この信号面５Ｓにより反射された反射光は、対物レンズ４により平行光となり、コリメートレンズ３により集光され、ビームスプリッタ２のスプリット面２ａにより反射されて、光検出器７の上に集束されて集束光８となる。   In FIG. 10A, the outgoing light emitted from the light source 1 is transmitted through the beam splitter 2 and becomes parallel light by the collimator lens 3, and the optical disk signal surface (hereinafter referred to as signal surface) of the optical disk substrate 5 by the objective lens 4. It is condensed on 5S and becomes the focused light 6. The reflected light reflected by the signal surface 5S is converted into parallel light by the objective lens 4, collected by the collimating lens 3, reflected by the split surface 2a of the beam splitter 2, and focused on the photodetector 7. The focused light 8 is obtained.

図１０（ｂ）に示すように、信号面５Ｓ上の集光スポット６Ｓは、信号面５Ｓの上に周期的に形成された凹状の案内溝５Ｇの上に位置制御され、光ディスク基材５の回転に伴って案内溝５Ｇ上を走査する。一方、図１０（ｃ）に示すように、光検出器７は互いに直交する分割線７１及び７２により、検出面が光検出素子７ａ、７ｂ、７ｃ、７ｄに４分割されている。従って検出面上の集光スポットも、分割線７１、７２により集光スポット８ａ、８ｂ、８ｃ、８ｄに４分割される。分割線７１の方位は、信号面５Ｓ上の案内溝５Ｇの方位に対応する。光検出素子７ａ、７ｂ、７ｃ、７ｄから検出される検出信号を７Ａ，７Ｂ，７Ｃ，７Ｄとすると、案内溝５Ｇに対するトラッキングエラー信号（ＴＥ信号）、ピットや記録マーク等に対するトラッキングエラーを与える位相差信号（ＤＰＤ信号）、及び再生信号（ＲＦ信号）は各々、（式１）、（式２）、及び（式３）に従って生成される。   As shown in FIG. 10B, the position of the focused spot 6S on the signal surface 5S is controlled on the concave guide groove 5G periodically formed on the signal surface 5S, and The guide groove 5G is scanned along with the rotation. On the other hand, as shown in FIG. 10C, the detection surface of the light detector 7 is divided into four light detection elements 7a, 7b, 7c, and 7d by dividing lines 71 and 72 orthogonal to each other. Accordingly, the focused spot on the detection surface is also divided into four focused spots 8a, 8b, 8c, and 8d by the dividing lines 71 and 72. The direction of the dividing line 71 corresponds to the direction of the guide groove 5G on the signal surface 5S. If detection signals detected from the light detection elements 7a, 7b, 7c, and 7d are 7A, 7B, 7C, and 7D, a tracking error signal (TE signal) for the guide groove 5G and a tracking error for a pit, a recording mark, etc. The phase difference signal (DPD signal) and the reproduction signal (RF signal) are generated according to (Equation 1), (Equation 2), and (Equation 3), respectively.

ＴＥ＝（７Ａ＋７Ｄ）−（７Ｂ＋７Ｃ） …（式１）
ＤＰＤ＝（７Ａ＋７Ｃ）−（７Ｂ＋７Ｄ） …（式２）
ＲＦ＝７Ａ＋７Ｂ＋７Ｃ＋７Ｄ …（式３）
なお、ビームスプリッタ２と光検出器７との間にホログラム９を配置する構成を用いる場合もある。この場合は、図１０（ｄ）に示すように、ホログラム９による回折で集光スポットは分離し、光検出素子７ａ内に収まる集光スポット８ａ’、光検出素子７ｂ内に収まる集光スポット８ｂ’、光検出素子７ｃ内に収まる集光スポット８ｃ’、及び光検出素子７ｄ内に収まる集光スポット８ｄ’に４分割される。 TE = (7A + 7D) − (7B + 7C) (Formula 1)
DPD = (7A + 7C) − (7B + 7D) (Formula 2)
RF = 7A + 7B + 7C + 7D (Formula 3)
A configuration in which the hologram 9 is disposed between the beam splitter 2 and the photodetector 7 may be used. In this case, as shown in FIG. 10 (d), the condensing spot is separated by diffraction by the hologram 9, and the condensing spot 8a 'that fits in the photodetecting element 7a and the condensing spot 8b that fits in the photodetecting element 7b. ', A condensing spot 8c' that fits in the photodetecting element 7c and a condensing spot 8d 'that fits in the photodetecting element 7d.

ホログラム９の有無に関わらず従来例では、光ディスクの番地信号の検出がＴＥ信号に基づいて行われていた。   Regardless of the presence or absence of the hologram 9, in the conventional example, the detection of the address signal of the optical disk is performed based on the TE signal.

図１１は、従来例に於ける光ディスクの番地信号プリピット５Ａの形状を示す平面図である。図１１に於いて、案内溝５Ｇの間はランド部５Ｌである。番地信号プリピット５Ａは、案内溝５Ｇと同じ高さを保ち、案内溝５Ｇから片側のランド部５Ｌの領域に、突起部寸法ａ、突起部長さｂだけ突出した形状をなす。突起部寸法ａは、案内溝５Ｇの中心線ＧＣからの距離、突起部長さｂは、案内溝５Ｇの方向に沿った距離である。このプリピット５Ａを所定の規則に従って信号面５Ｓ上に配置することで、信号面５Ｓ上の各位置に割り当てた番地を表す。集光スポット６Ｓが案内溝５Ｇ上を走査する際に、番地信号プリピット５Ａの存在によって、ＴＥ信号が影響を受ける。   FIG. 11 is a plan view showing the shape of the address signal prepit 5A of the optical disc in the conventional example. In FIG. 11, a land portion 5L is formed between the guide grooves 5G. The address signal pre-pit 5A maintains the same height as the guide groove 5G, and has a shape that protrudes from the guide groove 5G to the land portion 5L on one side by a protrusion dimension a and a protrusion length b. The protrusion dimension a is a distance from the center line GC of the guide groove 5G, and the protrusion length b is a distance along the direction of the guide groove 5G. By arranging the pre-pits 5A on the signal surface 5S according to a predetermined rule, addresses assigned to the respective positions on the signal surface 5S are represented. When the focused spot 6S scans the guide groove 5G, the TE signal is affected by the presence of the address signal pre-pit 5A.

図１２はその一例であり、未記録の領域を再生した場合の番地信号プリピット５Ａ前後での、ＴＥ信号波形１０ａと、ＤＰＤ信号波形１１ａとを示している。横軸は案内溝５Ｇの長さ方向における位置（μｍ）、縦軸は信号量（％）を示す。ただし、この例では測定条件として、光源１の波長λを０．６６μｍ，対物レンズ４のＮＡを０．６２，案内溝５Ｇのピッチｐを０．７４μｍ，案内溝５Ｇとプリピット５Ａの光学的深さｄを７ｐ／７２，案内溝５Ｇの幅ｗを０．３０μｍ，突起部寸法ａを０．２３μｍ，突起部長さｂを４Ｔに設定した。Ｔはクロック周波数に対応する長さであり、Ｔ＝０．１３３μｍとした。図示されるように、番地信号プリピット５ＡによりＴＥ信号波形１０ａに大きな振幅が発生し、この振幅波形を所定のスライスレベルと比較し検出することで、番地信号を検出できる。なお、ＤＰＤ信号波形１１ａは同図に示したように、プリピット５Ａによる影響を受けず、ほとんど振幅がゼロの状態のままである。
DVD Specifications for DVD-R for General, Physical Specifications Version 2.0 FIG. 12 shows an example, and shows a TE signal waveform 10a and a DPD signal waveform 11a before and after the address signal prepit 5A when an unrecorded area is reproduced. The horizontal axis represents the position (μm) in the length direction of the guide groove 5G, and the vertical axis represents the signal amount (%). However, in this example, as measurement conditions, the wavelength λ of the light source 1 is 0.66 μm, the NA of the objective lens 4 is 0.62, the pitch p of the guide groove 5G is 0.74 μm, and the optical depth of the guide groove 5G and the prepit 5A. The depth d was set to 7p / 72, the width w of the guide groove 5G was set to 0.30 μm, the protrusion dimension a was set to 0.23 μm, and the protrusion length b was set to 4T. T is a length corresponding to the clock frequency, and T = 0.133 μm. As shown in the figure, the address signal pre-pit 5A generates a large amplitude in the TE signal waveform 10a, and the address signal can be detected by comparing this amplitude waveform with a predetermined slice level. The DPD signal waveform 11a is not affected by the pre-pit 5A as shown in the figure, and the amplitude remains almost zero.
DVD Specifications for DVD-R for General, Physical Specifications Version 2.0

このような従来の光ディスク及び光ディスク装置において、以下の問題があった。すなわち、記録済の領域を再生した場合の番地信号プリピット５Ａ前後における、ＴＥ信号波形とＤＰＤ信号波形の変化である。図１３は、記録済みの場合の番地信号プリピット５Ａ前後での、ＴＥ信号波形１０ｂとＤＰＤ信号波形１１ｂを示している。同図は、記録によって案内溝５Ｇとプリピット５Ａの光学的深さｄが、ｐ／４となった場合に相当する。図から明らかなように、記録後の場合のＴＥ信号波形１０ｂは、プリピット５Ａの存在にも関わらずほとんど振幅がゼロの状態であり、この振幅波形を検出することは不可能である。   Such conventional optical discs and optical disc apparatuses have the following problems. That is, this is a change in the TE signal waveform and the DPD signal waveform before and after the address signal prepit 5A when the recorded area is reproduced. FIG. 13 shows the TE signal waveform 10b and the DPD signal waveform 11b before and after the address signal prepit 5A in the recorded state. This figure corresponds to the case where the optical depth d of the guide groove 5G and the prepit 5A is p / 4 by recording. As is apparent from the figure, the TE signal waveform 10b after recording has almost zero amplitude despite the presence of the prepit 5A, and it is impossible to detect this amplitude waveform.

この現象は、図１４を用いて次のように説明できる。同図は、ＤＶＤ−ＲやＤＶＤ−ＲＷ等のディスク仕様での、案内溝５Ｇ及びプリピット５Ａの光学的深さと、検出信号振幅との関係を示す。横軸は光学的深さ（λ／７２０）、縦軸は検出信号振幅（％）を示す。ただし測定条件は、光源１の波長λを０．６６μｍ，対物レンズ４のＮＡを０．６２，案内溝５Ｇのピッチｐを０．７４μｍ，案内溝５Ｇの幅ｗを０．３０μｍとした。ＴＥ信号振幅１２は、集光スポット６Ｓが案内溝５Ｇを横断した時の全振幅の検出値を示す。ＲＦ信号振幅１３は、孤立トラック３Ｔ連続記録信号を再生した場合の信号振幅の検出値を示す。ＤＰＤ信号振幅１４は、４Ｔ連続位相ピット信号をオフトラック０．１μｍで再生した場合の信号振幅の検出値を示す。   This phenomenon can be explained as follows using FIG. This figure shows the relationship between the optical depth of the guide groove 5G and the prepit 5A and the detection signal amplitude in the disc specifications such as DVD-R and DVD-RW. The horizontal axis represents the optical depth (λ / 720), and the vertical axis represents the detection signal amplitude (%). However, the measurement conditions were such that the wavelength λ of the light source 1 was 0.66 μm, the NA of the objective lens 4 was 0.62, the pitch p of the guide groove 5G was 0.74 μm, and the width w of the guide groove 5G was 0.30 μm. The TE signal amplitude 12 indicates the detected value of the total amplitude when the focused spot 6S crosses the guide groove 5G. The RF signal amplitude 13 indicates a detected value of the signal amplitude when the isolated track 3T continuous recording signal is reproduced. The DPD signal amplitude 14 indicates a detected value of the signal amplitude when the 4T continuous phase pit signal is reproduced with an off track of 0.1 μm.

図１４に示すように、ＴＥ信号振幅１２は光学的深さｄがｐ／８で極大となり、光学的深さｄがｐ／４で極小（ゼロ）となる。一方、ＲＦ信号振幅１３やＤＰＤ信号振幅１４は、光学的深さｄがｐ／４で極大となる。ＤＶＤ−ＲやＤＶＤ−ＲＷ等のディスクでは、未記録時での案内溝５Ｇの光学的深さｄはλ／２０〜λ／１０程度であり、記録により形成される信号マークの光学的深さｄはλ／８〜λ／５程度の位相ピットとして作用する。従って元々存在する案内溝５Ｇと合わさることで、記録マークでは光学的深さｄがｐ／４近傍になるので、ＲＦ信号の振幅を極大にできる。一方、記録マークがプリピット５Ａに重なった場合には、プリピット５ＡによるＴＥ信号の振幅はゼロになり、記録後（記録中も同様）の番地信号の読みとりができなくなる。特に、ＤＶＤ−Ｒ等の光ディスクを高倍速で記録する場合、記録マークは滲みやすく、記録マークがプリピット５Ａ全域を覆い尽くし、一層ＴＥ信号の振幅が出難くなる傾向にあった。   As shown in FIG. 14, the TE signal amplitude 12 becomes maximum when the optical depth d is p / 8, and becomes minimum (zero) when the optical depth d is p / 4. On the other hand, the RF signal amplitude 13 and the DPD signal amplitude 14 become maximum when the optical depth d is p / 4. In discs such as DVD-R and DVD-RW, the optical depth d of the guide groove 5G when not recorded is about λ / 20 to λ / 10, and the optical depth of the signal mark formed by recording is about d acts as a phase pit of about λ / 8 to λ / 5. Accordingly, when combined with the originally existing guide groove 5G, the optical depth d of the recording mark is in the vicinity of p / 4, so that the amplitude of the RF signal can be maximized. On the other hand, when the recording mark overlaps the pre-pit 5A, the amplitude of the TE signal by the pre-pit 5A becomes zero, and the address signal after recording (same during recording) cannot be read. In particular, when an optical disk such as a DVD-R is recorded at a high speed, the recording mark tends to bleed, the recording mark covers the entire prepit 5A, and the amplitude of the TE signal tends to be more difficult to be output.

本発明はかかる問題点に鑑み、記録前は当然、記録後に記録マークが番地プリピットに重なった領域においても、番地信号を確実に読みとることが可能な光ディスク、及び光ディスク装置を提供することを目的とする。   In view of such problems, the present invention has an object to provide an optical disc and an optical disc apparatus capable of reliably reading an address signal even in a region where a recording mark is overlapped with an address pre-pit after recording. To do.

本発明の第１の構成の光ディスクは、円板状の基板の径方向にピッチｐの周期をなしながら円周方向に沿って形成された案内溝を有し、前記案内溝に沿って前記案内溝間にプリピットが形成され、所定の規則に従った前記プリピットの配置により、信号面の各位置に割り当てた番地信号を表すように構成され、前記プリピットは、前記案内溝の両側にそれぞれ形成された一対のプリピットを単位として構成され、前記一対のプリピットは互いに円周方向に沿って位置がずれており、円周方向における前記一対のプリピットの各端縁のうち、両プリピット間の内側となる各端縁の間の距離が、前記案内溝のピッチｐ以下であることを特徴とする。   The optical disk having the first structure of the present invention has guide grooves formed along the circumferential direction while forming a period of a pitch p in the radial direction of the disk-shaped substrate, and the guide is formed along the guide grooves. Prepits are formed between the grooves, and are configured to represent address signals assigned to each position on the signal surface by the arrangement of the prepits according to a predetermined rule, and the prepits are respectively formed on both sides of the guide groove. The pair of prepits are displaced from each other along the circumferential direction, and are located between the two prepits at the edges of the pair of prepits in the circumferential direction. The distance between each edge is below the pitch p of the said guide groove, It is characterized by the above-mentioned.

また、本発明の第２の構成の光ディスクは、円板状の基板の径方向にピッチｐの周期をなしながら円周方向に沿って形成された案内溝を有し、前記案内溝に沿って前記案内溝間にプリピットが形成され、所定の規則に従った前記プリピットの配置により、記録面の各位置に割り当てた番地信号を表すように構成され、前記プリピットが形成されている領域の一部において、前記案内溝部分が断絶している断絶領域を有することを特徴とする。   The optical disk of the second configuration of the present invention has a guide groove formed along the circumferential direction while forming a period of pitch p in the radial direction of the disk-shaped substrate, and along the guide groove Prepits are formed between the guide grooves, and are configured to represent address signals assigned to respective positions on the recording surface by the arrangement of the prepits according to a predetermined rule, and a part of the area where the prepits are formed And the guide groove portion has a cut-off region.

本発明の光ディスク装置は、基本的な構成として、光源と、複数の受光素子を有する光検出器と、前記光源からの光束を光ディスク上に集束させ前記光ディスクからの反射光を前記光検出器上に集束させる光学系と、前記光検出器の出力に基づき前記光束に対するフォーカス制御を行うフォーカス制御部と、前記光検出器の出力に基づき前記光束に対するトラッキング制御を行うトラッキング制御部と、前記光検出器の出力から前記光ディスクの信号面の各位置に割り当てた番地信号を検出するアドレス検出部とを備え、上記いずれかの構成の光ディスクが装填され、前記アドレス検出部は、前記光ディスク上の前記プリピットに基づく前記光検出器の出力から前記番地信号を検出する。   The optical disc apparatus of the present invention basically has a light source, a photodetector having a plurality of light receiving elements, a light beam from the light source focused on the optical disc, and reflected light from the optical disc on the photodetector. An optical system that focuses the light beam, a focus control unit that performs focus control on the light beam based on the output of the light detector, a tracking control unit that performs tracking control on the light beam based on the output of the light detector, and the light detection An address detection unit for detecting an address signal assigned to each position on the signal surface of the optical disc from the output of the optical disc, and the optical disc having any one of the above-mentioned configurations is loaded, and the address detection unit is connected to the pre-pit on the optical disc. The address signal is detected from the output of the photodetector based on the above.

そして、本発明の第１の構成の光ディスク装置は、前記光ディスクの径方向及び円周方向に沿った直線で４分割される４つの領域Ａ，Ｂ，Ｃ，Ｄを、領域Ａ，Ｂ間を分割する直線の方向を円周方向として、時計回りに領域Ａ，Ｂ，Ｃ，Ｄが定義されたとき、前記光ディスクの領域Ａ，Ｂ，Ｃ，Ｄからの反射光は、前記光検出器を構成する前記複数の受光素子上に各々別個に投射されて、それぞれ検出信号ａ，ｂ，ｃ，ｄが生成され、｛（ａ＋ｃ）−（ｂ＋ｄ）｝により算出されるＤＰＤ信号を前記番地信号の検出に用いることを特徴とする。   In the optical disk apparatus having the first configuration according to the present invention, four areas A, B, C, and D divided into four by a straight line along the radial direction and the circumferential direction of the optical disk are divided between the areas A and B. When areas A, B, C, and D are defined clockwise with the direction of the straight line to be divided as the circumferential direction, the reflected light from areas A, B, C, and D of the optical disc The detection signals a, b, c, and d are respectively projected onto the plurality of light receiving elements that are configured, and the DPD signal calculated by {(a + c) − (b + d)} is converted into the address signal. It is used for detection.

また、本発明の第２の構成の光ディスク装置は、前記光ディスクの径方向及び円周方向に沿った直線で４分割される４つの領域Ａ，Ｂ，Ｃ，Ｄを、領域Ａ，Ｂ間を分割する直線の方向を円周方向として、時計回りに領域Ａ，Ｂ，Ｃ，Ｄが定義されたとき、前記光ディスクの領域Ａ，Ｂ，Ｃ，Ｄからの反射光は、前記光検出器を構成する前記複数の受光素子上に各々別個に投射されて、それぞれ検出信号ａ，ｂ，ｃ，ｄが生成され、｛（ａ＋ｄ）−（ｂ＋ｃ）｝により算出されるＴＥ信号と、｛（ａ＋ｃ）−（ｂ＋ｄ）｝により算出されるＤＰＤ信号のうち、いずれか一方を検出状況に応じて選択して前記番地信号の検出に用いることを特徴とする。   Further, the optical disk device of the second configuration of the present invention is divided into four areas A, B, C, D divided into four by a straight line along the radial direction and the circumferential direction of the optical disk. When areas A, B, C, and D are defined clockwise with the direction of the straight line to be divided as the circumferential direction, the reflected light from areas A, B, C, and D of the optical disc A TE signal calculated by {(a + d)-(b + c)} is generated by projecting separately on each of the plurality of light-receiving elements that are configured to generate detection signals a, b, c, and d, respectively, {(a + c )-(B + d)}, one of the DPD signals calculated according to the detection situation is selected and used for the detection of the address signal.

また、本発明の第３の構成の光ディスク装置は、前記光ディスクの径方向及び円周方向に沿った直線で４分割される４つの領域Ａ，Ｂ，Ｃ，Ｄを、領域Ａ，Ｂ間を分割する直線の方向を円周方向として、時計回りに領域Ａ，Ｂ，Ｃ，Ｄが定義されたとき、前記光ディスクの領域Ａ，Ｂ，Ｃ，Ｄからの反射光は、前記光検出器を構成する前記複数の受光素子上に各々別個に投射されて、それぞれ検出信号ａ，ｂ，ｃ，ｄが生成され、｛（ａ＋ｄ）−（ｂ＋ｃ）｝により算出されるＴＥ信号と、｛（ａ＋ｃ）−（ｂ＋ｄ）｝により算出されるＤＰＤ信号と、（ａ−ｂ）または（ｃ−ｄ）により算出される２ｃｈ−ＤＰＤ信号のうち、いずれか一方を検出状況に応じて選択して前記番地信号の検出に用いることを特徴とする。   Further, the optical disk device of the third configuration of the present invention is divided into four areas A, B, C, D divided into four by a straight line along the radial direction and the circumferential direction of the optical disk. When areas A, B, C, and D are defined clockwise with the direction of the straight line to be divided as the circumferential direction, the reflected light from areas A, B, C, and D of the optical disc A TE signal calculated by {(a + d)-(b + c)} is generated by projecting separately on each of the plurality of light-receiving elements that are configured to generate detection signals a, b, c, and d, respectively, {(a + c ) − (B + d)} and the 2ch-DPD signal calculated according to (ab) or (cd) according to the detection situation, and select the address. It is used for the detection of a signal.

上記構成によれば、未記録時のＤＰＤ信号の振幅が大きく、記録によってさらに増幅する傾向が得られる。従って、ＤＰＤ信号により番地信号を検出したり、ＴＥ信号と併用することで、記録前は勿論のこと、記録後であっても番地信号の読み誤りを抑制することができる。   According to the above configuration, the amplitude of the unrecorded DPD signal is large, and a tendency to further amplify by recording can be obtained. Therefore, by detecting the address signal from the DPD signal or using it together with the TE signal, it is possible to suppress the reading error of the address signal not only before recording but also after recording.

また、番地信号プリピットでのＴＥ信号波形が従来例での波形と変わらないので、プリピット位置を従来例での位置と統一しておけば、本発明による光ディスクを従来構成の光ディスク装置にも使用することができ、ドライブ互換性を確保できる。   Further, since the TE signal waveform in the address signal pre-pit is not different from the waveform in the conventional example, if the pre-pit position is unified with the position in the conventional example, the optical disc according to the present invention can be used for the optical disc apparatus of the conventional configuration. And drive compatibility can be ensured.

上記第１の構成の光ディスクにおいて、前記一対のプリピットのうち、前記案内溝の片側の前記プリピットと、前記案内溝の他方の側の前記プリピットの円周方向に於ける配置順序により、前記番地信号の情報の一部を構成することができる。   In the optical disk having the first configuration, the address signal is determined by an arrangement order of the prepits on one side of the guide groove and the prepits on the other side of the guide groove in the circumferential direction of the pair of prepits. Part of the information can be configured.

上記第２の構成の光ディスクにおいて、円周方向における前記案内溝の断絶領域の長さである断絶幅が０．５ｐ以上であることが好ましい。   In the optical disk having the second configuration, it is preferable that a break width, which is the length of the break area of the guide groove in the circumferential direction, is 0.5 p or more.

上記第２の構成の光ディスク装置において、前記光ディスクが未記録状態である場合には、前記ＴＥ信号を前記番地信号の検出に用い、前記光ディスクが記録済状態である場合には、前記ＴＥ信号と前記ＤＰＤ信号のうちの信号品質の良い方を選択して前記番地信号の検出に用いる構成とすることができる。   In the optical disk apparatus of the second configuration, when the optical disk is in an unrecorded state, the TE signal is used for detection of the address signal, and when the optical disk is in a recorded state, the TE signal The DPD signal having the better signal quality can be selected and used for detecting the address signal.

上記第３の構成の光ディスク装置において、前記光ディスクが未記録状態である場合には、前記ＴＥ信号を前記番地信号の検出に用い、前記光ディスクが記録済状態である場合には、前記ＴＥ信号と、前記ＤＰＤ信号と、前記２ｃｈ−ＤＰＤ信号のうちの信号品質の良い方を選択して前記番地信号の検出に用いる構成とすることができる。   In the optical disk device of the third configuration, when the optical disk is in an unrecorded state, the TE signal is used for detection of the address signal, and when the optical disk is in a recorded state, the TE signal The DPD signal and the 2ch-DPD signal having the better signal quality can be selected and used for the detection of the address signal.

以下、本発明の実施の形態について、図面を参照して具体的に説明する。   Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

（実施の形態１）
本発明の実施の形態１について、図１〜図４を参照して説明する。本実施の形態に於ける光ディスク装置の要部構成は、図１０（ａ）に示した従来例と同様である。また光ディスク信号面上を光スポットが走査する様子は図１０（ｂ）、光検出器上の光スポット検出の形態は図１０（ｃ）により、それぞれ示されるものと同様である。従って、以下の説明では、それらの図面を参照し、従来例と共通の要素については、同一の参照番号を付して説明し、説明の繰り返しは省略する。 (Embodiment 1)
Embodiment 1 of the present invention will be described with reference to FIGS. The configuration of the main part of the optical disk apparatus in the present embodiment is the same as that of the conventional example shown in FIG. Further, the manner in which the light spot scans on the optical disc signal surface is the same as that shown in FIG. 10B, and the form of the light spot detection on the photodetector is the same as that shown in FIG. Therefore, in the following description, those drawings are referred to, and the elements common to the conventional example are described with the same reference numerals, and the description will not be repeated.

本実施の形態では、ホログラム９の有無に関わらず、光ディスクの番地信号の検出にＤＰＤ信号が用いられる。   In the present embodiment, the DPD signal is used for detecting the address signal of the optical disc regardless of the presence or absence of the hologram 9.

図１Ａ及び図１Ｂは、本実施の形態に於ける光ディスクの番地信号プリピットの形状を示す平面図である。本実施の形態では、案内溝５Ｇに対して配置される一単位のプリピットが、一対の番地信号プリピット５Ａ、５Ｂにより構成される。一方の番地信号プリピット５Ａは、案内溝５Ｇと同じ高さを保ち、案内溝５Ｇから片側のランド部５Ｌの領域に、案内溝５Ｇの中心線ＧＣから突起部寸法ａ、突起部長さｂだけ突出した形状をなしている。他方の番地信号プリピット５Ｂは、案内溝５Ｇと同じ高さを保ち、案内溝５Ｇから反対側のランド部５Ｌの領域に、案内溝５Ｇの中心線ＧＣから突起部寸法ａ、突起部長さｂだけ突出した形状をなしている。これらのプリピット５Ａ及び５Ｂは、案内溝５Ｇの方向においてずらして配置されている。すなわち、図１Ａに示すように、プリピット５Ａがプリピット５Ｂと端縁間距離ｃだけ重なるか、または図１Ｂに示すように、プリピット５Ａがプリピット５Ｂと端縁間距離ｃだけ乖離する関係にある。何れの構成であってもよい。端縁間距離ｃは、案内溝５Ｇの方向における一対のプリピット５Ａ、５Ｂの各端縁のうち、両プリピット５Ａ、５Ｂ間の内側となる各端縁の間の距離として定義される。   1A and 1B are plan views showing the shape of the address signal prepits of the optical disk in the present embodiment. In the present embodiment, one unit of prepit arranged with respect to the guide groove 5G is constituted by a pair of address signal prepits 5A and 5B. One address signal pre-pit 5A keeps the same height as the guide groove 5G, and protrudes from the guide groove 5G to the land portion 5L on one side by a protrusion dimension a and a protrusion length b from the center line GC of the guide groove 5G. The shape is made. The other address signal pre-pit 5B keeps the same height as the guide groove 5G, and in the area of the land portion 5L on the opposite side from the guide groove 5G, only the protrusion dimension a and the protrusion length b from the center line GC of the guide groove 5G. It has a protruding shape. These pre-pits 5A and 5B are arranged so as to be shifted in the direction of the guide groove 5G. That is, as shown in FIG. 1A, the pre-pit 5A overlaps with the pre-pit 5B by the end-to-edge distance c, or as shown in FIG. 1B, the pre-pit 5A is separated from the pre-pit 5B by the end-to-edge distance c. Any configuration may be used. The end-to-end distance c is defined as the distance between the end edges of the pair of pre-pits 5A and 5B in the direction of the guide groove 5G, which is the inner side between the two pre-pits 5A and 5B.

ＤＰＤ信号の振幅は端縁間距離ｃに関係し、端縁間距離ｃが案内溝５Ｇのピッチｐよりも小さい値、例えば図１Ａのモデルで端縁間距離ｃが０．１３３μｍ程度の時に極大となる。本実施の形態ではこのプリピット５Ａと５Ｂの組み合わせを、所定の規則に従ってディスク信号面上に配置することで、信号面上に番地を割り当てる。集光スポット６Ｓが案内溝５Ｇ上を走査する場合、この番地信号プリピット５Ａと番地プリピット５Ｂとの存在によってＤＰＤ信号は影響を受ける。   The amplitude of the DPD signal is related to the edge-to-edge distance c, and is maximized when the edge-to-edge distance c is smaller than the pitch p of the guide groove 5G, for example, when the edge-to-edge distance c is about 0.133 μm in the model of FIG. It becomes. In this embodiment, an address is assigned on the signal surface by arranging the combination of the pre-pits 5A and 5B on the disk signal surface according to a predetermined rule. When the focused spot 6S scans on the guide groove 5G, the DPD signal is affected by the presence of the address signal prepit 5A and the address prepit 5B.

図２に示す信号波形はその一例であって、未記録の領域を再生した場合における、番地信号プリピット前後でのＴＥ信号波形１５ａと、ＤＰＤ信号波形１６ａとを示す。ただし、番地信号プリピットとしては、図１Ａの形態の番地信号プリピット５Ａ、５Ｂを用いた場合の例である。測定条件として、光源１の波長λは０．６６μｍ，対物レンズ４のＮＡは０．６２，案内溝５Ｇ及び番地信号プリピット５Ａ、５Ｂの光学的深さｄは７λ／７２，案内溝５Ｇのピッチｐは０．７４μｍ，案内溝５Ｇの幅ｗは０．３０μｍ，突起部寸法ａは０．３７μｍ，突起部長さｂは５Ｔ、端縁間距離ｃはＴとした。Ｔはクロック周波数に対応し０．１３３μｍに相当する。図に示されるとおり、番地信号プリピット５Ａ及び５ＢによりＤＰＤ信号波形１６ａに大きな振幅が発生し、この振幅波形を所定のスライスレベルと比較し検出することで番地信号を検出できる。なお、ＴＥ信号波形１５ａも、プリピット５Ａ、５Ｂによる影響で正と負の方向に大きな振幅が発生している。   The signal waveform shown in FIG. 2 is an example, and shows a TE signal waveform 15a before and after an address signal prepit and a DPD signal waveform 16a when an unrecorded area is reproduced. However, as the address signal prepits, the address signal prepits 5A and 5B in the form of FIG. 1A are used. As measurement conditions, the wavelength λ of the light source 1 is 0.66 μm, the NA of the objective lens 4 is 0.62, the optical depth d of the guide grooves 5G and the address signal prepits 5A and 5B is 7λ / 72, and the pitch of the guide grooves 5G. p is 0.74 μm, the width w of the guide groove 5G is 0.30 μm, the protrusion dimension a is 0.37 μm, the protrusion length b is 5T, and the edge distance c is T. T corresponds to the clock frequency and corresponds to 0.133 μm. As shown in the figure, a large amplitude is generated in the DPD signal waveform 16a by the address signal prepits 5A and 5B, and the address signal can be detected by comparing the amplitude waveform with a predetermined slice level. The TE signal waveform 15a also has a large amplitude in the positive and negative directions due to the influence of the prepits 5A and 5B.

図３は、記録済の領域を再生した場合における、番地信号プリピット前後でのＴＥ信号波形１５ｂとＤＰＤ信号波形１６ｂとを示す。これらの波形は、記録によって案内溝５Ｇと番地信号プリピット５Ａ及び５Ｂの光学的深さｄがｐ／４となった場合に相当する。図３から明らかなように、記録後のＴＥ信号波形１５ｂは、プリピット５Ａ、５Ｂの存在にも関わらず、従来例と同様にほとんど振幅がゼロの状態となる。これに対して、ＤＰＤ信号波形１６ｂは、信号振幅が大きく、未記録時の振幅よりもむしろ増幅している。この現象は、前述の図１４を用いて次のように説明できる。   FIG. 3 shows the TE signal waveform 15b and the DPD signal waveform 16b before and after the address signal pre-pit when the recorded area is reproduced. These waveforms correspond to the case where the optical depth d of the guide groove 5G and the address signal prepits 5A and 5B becomes p / 4 by recording. As can be seen from FIG. 3, the TE signal waveform 15b after recording is almost in the state of zero amplitude as in the conventional example, regardless of the presence of the prepits 5A and 5B. On the other hand, the DPD signal waveform 16b has a large signal amplitude and is amplified rather than an unrecorded amplitude. This phenomenon can be explained as follows with reference to FIG.

すなわち、図１４に示したように、ＴＥ信号振幅１２は光学的深さｄがλ／８で極大となり、λ／４で極小（ゼロ）となる。一方、ＲＦ信号振幅１３やＤＰＤ信号振幅１４は、λ／４で極大となる。ＤＶＤ−ＲやＤＶＤ−ＲＷ等の光ディスクでは、未記録時での案内溝５Ｇの光学的深さｄはλ／２０〜λ／１０程度であり、記録により形成される信号マークの光学的深さｄがλ／８〜λ／５程度の位相ピットとして作用する。従って、元々存在する案内溝５Ｇの深さと合わさることで、記録マークの光学的深さｄはλ／４近傍になるので、ＲＦ信号振幅１３は極大になる。そして、記録マークがプリピット５Ａ、５Ｂに重なった箇所では、ＴＥ信号振幅１２はゼロとなるが、ＤＰＤ信号振幅１４は増幅して極大となる。記録マークがプリピット５Ａ、５Ｂから外れた箇所では、ＴＥ信号振幅１２及びＤＰＤ信号振幅１４は未記録時と変わらない。記録マークがプリピット５Ａ、５Ｂの一部に重なる箇所では、当然ながら、ＤＰＤ信号振幅１４及びＴＥ信号振幅１２は、上記した場合の中間的な振幅となる。   That is, as shown in FIG. 14, the TE signal amplitude 12 becomes maximum when the optical depth d is λ / 8 and becomes minimum (zero) at λ / 4. On the other hand, the RF signal amplitude 13 and the DPD signal amplitude 14 are maximum at λ / 4. In an optical disc such as a DVD-R or DVD-RW, the optical depth d of the guide groove 5G when not recorded is about λ / 20 to λ / 10, and the optical depth of a signal mark formed by recording. It acts as a phase pit having d of about λ / 8 to λ / 5. Accordingly, the optical depth d of the recording mark is in the vicinity of λ / 4 by being combined with the originally existing depth of the guide groove 5G, so that the RF signal amplitude 13 is maximized. Then, at the location where the recording mark overlaps the pre-pits 5A and 5B, the TE signal amplitude 12 becomes zero, but the DPD signal amplitude 14 is amplified and becomes maximum. At locations where the recording marks deviate from the pre-pits 5A and 5B, the TE signal amplitude 12 and the DPD signal amplitude 14 are the same as when recording is not performed. Of course, where the recording mark overlaps a part of the pre-pits 5A and 5B, the DPD signal amplitude 14 and the TE signal amplitude 12 are intermediate between those described above.

以上のとおり、図２に示すように、未記録時のＤＰＤ信号振幅１６ａが大きく、図３に示したように、記録によってＤＰＤ信号振幅１６ｂが更に増幅する傾向にある。従って、本実施の形態では番地信号の検出をＤＰＤ信号に基づいて行うことにより、記録前は勿論のこと、記録後であっても番地信号の読み誤りが抑制される。   As described above, as shown in FIG. 2, the unrecorded DPD signal amplitude 16a is large, and as shown in FIG. 3, the DPD signal amplitude 16b tends to be further amplified by recording. Therefore, in the present embodiment, by detecting the address signal based on the DPD signal, reading errors of the address signal are suppressed not only before recording but also after recording.

本実施の形態の構成によれば、更に、次のような効果も得られる。図４は、未記録の領域の番地信号プリピットの前後を、隣接するトラックを走査する光スポットで再生した時のＴＥ信号波形１５ｃとＤＰＤ信号波形１６ｃを示している。ＴＥ信号波形１５ｃは振幅のある波形となるが、ＤＰＤ信号波形１６ｃには振幅が発生しない。すなわち、ＤＰＤ信号で番地信号を読み取る方式では、隣接トラックの番地信号プリピットによる影響を受けないので、オントラックでの番地信号プリピットだけを誤りなく判定すればよい。   According to the configuration of the present embodiment, the following effects are further obtained. FIG. 4 shows the TE signal waveform 15c and the DPD signal waveform 16c when the front and back of the address signal prepits in the unrecorded area are reproduced by the light spot that scans the adjacent track. The TE signal waveform 15c is a waveform having an amplitude, but no amplitude is generated in the DPD signal waveform 16c. That is, in the method of reading the address signal with the DPD signal, it is not affected by the address signal pre-pits of the adjacent tracks, so only the address signal pre-pits in the on-track need be determined without error.

なお、上述のように光ディスクの番地信号の検出をＤＰＤ信号１６ａ、１６ｂに基づいて行う方法に代えて、次のような方法を適用することも可能である。すなわち、未記録時のＴＥ信号１５ａの振幅が大きく、記録後でも記録マークが番地信号プリピット５Ａ、５Ｂから外れた場合にはＴＥ信号１５ｂの振幅が大きいことを利用する。例えば、番地信号の検出を未記録領域ではＴＥ信号１５ａにより、記録領域ではＤＰＤ信号１６ｂに基づいて行うことができる。あるいは、未記録領域、記録領域のいずれもＴＥ信号１５ａ、１５ｂ、ＤＰＤ信号１６ａ、１６ｂに基づく検出を行い、番地信号が検出された側を採用する形態とすることもできる。   Note that the following method can be applied instead of the method of detecting the address signal of the optical disc based on the DPD signals 16a and 16b as described above. That is, the fact that the amplitude of the TE signal 15b is large when the amplitude of the TE signal 15a at the time of unrecording is large and the recording mark deviates from the address signal prepits 5A and 5B even after recording is utilized. For example, the address signal can be detected based on the TE signal 15a in the unrecorded area and the DPD signal 16b in the recorded area. Alternatively, both the unrecorded area and the recorded area may be detected based on the TE signals 15a and 15b and the DPD signals 16a and 16b, and the side on which the address signal is detected may be adopted.

この場合、ＴＥ信号やＤＰＤ信号の代わりに、いわゆる２チャンネルのＤＰＤ信号を用いることもできる。すなわち、図１０（ｃ）に示した全円ではなく、半円（８ａ、８ｂ）または（８ｃ、８ｄ）で検出するＤＰＤ信号である、（７Ａ−７Ｂ）、又は（７Ｄ−７Ｃ）の演算信号を用いる。未記録領域の場合の２チャンネルのＤＰＤ信号の波形を、図２に２ｃｈ−ＤＰＤ信号波形１７ａとして示し、記録済み領域の場合の波形を、図３に２ｃｈ−ＤＰＤ信号波形１７ｂとして示す。図２から判るように、未記録領域の場合の２ｃｈ−ＤＰＤ信号波形１７ａは、ＴＥ信号波形１５ａに相似する。また図３から判るように、記録済み領域の場合の２ｃｈ−ＤＰＤ信号波形１７ｂは、ＤＰＤ信号波形１５ｂ（４チャンネルのＤＰＤ信号）に相似する。なお、図４に示すように、隣接トラックを再生した２ｃｈ−ＤＰＤ信号波形１７ｃは、ＴＥ信号波形１５ｃに相似する。このように、ＴＥ信号、２ｃｈ−ＤＰＤ信号、ＤＰＤ信号ともにそれぞれの特徴があるので、これらのうちのいずれか一つを状況に応じて選別して、番地信号の検出に用いることが可能である。   In this case, a so-called two-channel DPD signal can be used instead of the TE signal and the DPD signal. That is, the calculation of (7A-7B) or (7D-7C), which is a DPD signal detected by a semicircle (8a, 8b) or (8c, 8d), not the full circle shown in FIG. Use the signal. The waveform of a 2-channel DPD signal in the case of an unrecorded area is shown as a 2ch-DPD signal waveform 17a in FIG. 2, and the waveform in the case of a recorded area is shown as a 2ch-DPD signal waveform 17b in FIG. As can be seen from FIG. 2, the 2ch-DPD signal waveform 17a in the case of an unrecorded area is similar to the TE signal waveform 15a. As can be seen from FIG. 3, the 2ch-DPD signal waveform 17b in the case of the recorded area is similar to the DPD signal waveform 15b (4-channel DPD signal). As shown in FIG. 4, the 2ch-DPD signal waveform 17c reproduced from the adjacent track is similar to the TE signal waveform 15c. As described above, since each of the TE signal, the 2ch-DPD signal, and the DPD signal has respective characteristics, any one of them can be selected according to the situation and used for detecting the address signal. .

なお、プリピット５Ａと５Ｂとは、案内溝５Ｇに沿った順序が逆であってもよく、その場合ＤＰＤ信号波形は極性が反転するので、この順序の入れ替えを番地信号の情報の一つに加えることもできる。   Note that the order of the prepits 5A and 5B along the guide groove 5G may be reversed. In this case, the polarity of the DPD signal waveform is reversed, so this order change is added to one of the address signal information. You can also.

（実施の形態２）
以下、本発明の実施の形態２について、図５から図７を参照して説明する。なお実施の形態１と共通の要素については、同一の番号を付して説明する。本実施の形態においては、光ディスクの番地信号プリピットの形状が異なるだけで、光ディスク装置は実施の形態１と全く同じでありその説明を省略する。本実施の形態においても、実施の形態１と同様、光ディスクの番地信号の検出に、ＤＰＤ信号が用いられる。 (Embodiment 2)
The second embodiment of the present invention will be described below with reference to FIGS. In addition, about the element which is common in Embodiment 1, the same number is attached | subjected and demonstrated. In this embodiment, only the shape of the address signal prepit of the optical disk is different, and the optical disk apparatus is exactly the same as in the first embodiment, and the description thereof is omitted. Also in the present embodiment, a DPD signal is used for detecting an address signal of an optical disk, as in the first embodiment.

図５は、本実施形態に於ける光ディスクの番地信号プリピットの形状を示す平面図である。図５に於いて、番地信号プリピット５Ａ１は、案内溝５Ｇと同じ高さを保って案内溝５Ｇから片側のランド部５Ｌの領域に、案内溝５Ｇの中心線ＧＣから突起部寸法ａ１だけ突出している。また、案内溝５Ｇにおける番地信号プリピット５Ａ１が形成された領域では、その一部がランド部５Ｌと同じ高さになるように浸食され、案内溝５Ｇが断絶した断絶領域５Ｃ、５Ｄが形成されている。断絶領域５Ｄは、ＤＰＤ信号振幅を大きくするためにその存在が重要であって、断絶幅（ｗ／２＋ａ３）は案内溝５Ｇの幅ｗと同等程度の大きさであり、長さｂ２は例えば３Ｔ以上である。なお、断絶領域５Ｄにおいて、完全に案内溝５Ｇが断絶していることは必ずしも必要ではなく、案内溝５Ｇが多少残されていても、本実施の形態の効果が実質的に得られる範囲は存在する。断絶領域５Ｃの幅（ｗ／２−ａ２）はそれほど大きくなく、案内溝５Ｇの幅ｗの数分の一の大きさであり、長さｂ１は例えば３Ｔ程度である。本実施形態では、この形状のプリピット５Ａ１を規則に沿ってディスク信号面５Ｓ上に配置することで、信号面５Ｓ上に番地を割り当てている。   FIG. 5 is a plan view showing the shape of the address signal prepit of the optical disc in the present embodiment. In FIG. 5, the address signal pre-pit 5A1 protrudes from the guide groove 5G to the land portion 5L on one side by the projection dimension a1 from the center line GC of the guide groove 5G while maintaining the same height as the guide groove 5G. Yes. Further, in the area where the address signal pre-pit 5A1 is formed in the guide groove 5G, a part of the area is eroded so as to be the same height as the land portion 5L, and the cut areas 5C and 5D where the guide groove 5G is cut off are formed. Yes. The presence of the break region 5D is important in order to increase the DPD signal amplitude. The break width (w / 2 + a3) is about the same as the width w of the guide groove 5G, and the length b2 is, for example, 3T. That's it. In the disconnection region 5D, it is not always necessary that the guide groove 5G is completely disconnected, and there is a range in which the effect of the present embodiment can be substantially obtained even if the guide groove 5G is left to some extent. To do. The width (w / 2−a2) of the cut-off region 5C is not so large, is a fraction of the width w of the guide groove 5G, and the length b1 is, for example, about 3T. In the present embodiment, the address is assigned on the signal surface 5S by arranging the prepits 5A1 of this shape on the disc signal surface 5S according to the rules.

集光スポット６Ｓが案内溝５Ｇ上を走査する場合、この番地信号プリピット５Ａ１の存在によってＤＰＤ信号は影響を受ける。図６はその一例であり、未記録領域における番地信号プリピット５Ａ１前後での、ＴＥ信号波形１８ａおよびＤＰＤ信号波形１９ａを示している。ただし、これらの波形を測定した際の条件は、光源１の波長λは０．６６μｍ，対物レンズ４のＮＡは０．６２、案内溝５Ｇとプリピット５Ａ１の光学的深さｄは７λ／７２、案内溝５Ｇのピッチｐは０．７４μｍ、案内溝５Ｇの幅ｗは０．３０μｍ、突起部寸法ａ１は０．３７μｍ、寸法ａ２は０．０８μｍ，寸法ａ３は０．１７μｍ、長さｂ１は３Ｔ，長さｂ２は４Ｔ，長さｂ３はＴである。クロック周波数Ｔは０．１３３μｍに相当する。   When the focused spot 6S scans on the guide groove 5G, the DPD signal is affected by the presence of the address signal pre-pit 5A1. FIG. 6 shows an example thereof, and shows a TE signal waveform 18a and a DPD signal waveform 19a before and after the address signal prepit 5A1 in the unrecorded area. However, the conditions for measuring these waveforms are as follows: the wavelength λ of the light source 1 is 0.66 μm, the NA of the objective lens 4 is 0.62, and the optical depth d of the guide groove 5G and the prepit 5A1 is 7λ / 72, The pitch p of the guide groove 5G is 0.74 μm, the width w of the guide groove 5G is 0.30 μm, the projection dimension a1 is 0.37 μm, the dimension a2 is 0.08 μm, the dimension a3 is 0.17 μm, and the length b1 is 3T. , The length b2 is 4T, and the length b3 is T. The clock frequency T corresponds to 0.133 μm.

番地信号プリピット５Ａ１によりＤＰＤ信号波形１９ａに大きな振幅が発生し、この振幅波形をあるスライスレベルと比較して検出することで番地信号を検出できる。なお、ＴＥ信号波形１８ａもプリピットによる影響で負の方向に大きな振幅が発生している。振幅が負の方向だけに限られるのは、プリピット５Ａ１が片側のランド部のみに突出しているためである。   A large amplitude is generated in the DPD signal waveform 19a by the address signal prepit 5A1, and the address signal can be detected by detecting the amplitude waveform by comparing it with a certain slice level. The TE signal waveform 18a also has a large amplitude in the negative direction due to the influence of the pre-pits. The reason that the amplitude is limited only to the negative direction is that the prepit 5A1 protrudes only to one land portion.

図７は、記録後の領域における番地信号プリピット５Ａ１前後での、ＴＥ信号波形１８ｂとＤＰＤ信号波形１９ｂとを示している。これらの波形は、記録によって、案内溝５Ｇとプリピット５Ａ１の光学的深さｄがλ／４となった場合に相当する。同図から明らかなように、記録後のＴＥ信号波形１８ｂは、プリピットの存在にも関わらず従来例と同様にほとんど振幅がゼロの状態となる。これに対して、ＤＰＤ信号波形１９ｂは信号振幅が大きく、未記録時の振幅よりもむしろ増幅している（この現象の物理的原因は前述した通りである）。   FIG. 7 shows the TE signal waveform 18b and the DPD signal waveform 19b before and after the address signal prepit 5A1 in the area after recording. These waveforms correspond to the case where the optical depth d of the guide groove 5G and the prepit 5A1 is λ / 4 by recording. As can be seen from the figure, the TE signal waveform 18b after recording is almost in the state of zero amplitude as in the conventional example, regardless of the presence of pre-pits. On the other hand, the DPD signal waveform 19b has a large signal amplitude and is amplified rather than an unrecorded amplitude (the physical cause of this phenomenon is as described above).

以上のとおり、本実施形態では未記録時のＤＰＤ信号波形１９ａの振幅が大きく、また、記録によって更に増幅する傾向にあるので、記録前は勿論のこと、記録後であっても、番地信号の読み誤りが発生し難い。さらに、本実施形態における光ディスクの番地プリピット５Ａ１部分でのＴＥ信号波形１８ａ、１８ｂは従来例における波形と変わらない。従って、プリピット５Ａ１の位置を従来例での位置と統一しておけば、ＴＥ信号だけで番地信号を検出する従来例での光ディスク装置にも、本実施形態の光ディスクを使用することができ、新しいプリピット仕様の光ディスクであってもドライブ互換性を確保できるメリットがある。   As described above, in this embodiment, the amplitude of the unrecorded DPD signal waveform 19a is large and tends to be further amplified by recording. Therefore, the address signal can be recorded even before recording as well as before recording. Reading errors are unlikely to occur. Furthermore, the TE signal waveforms 18a and 18b at the address prepit 5A1 portion of the optical disk in the present embodiment are the same as the waveforms in the conventional example. Therefore, if the position of the pre-pit 5A1 is unified with the position in the conventional example, the optical disk of this embodiment can be used for the optical disk apparatus in the conventional example that detects the address signal only by the TE signal. There is an advantage that drive compatibility can be ensured even with a pre-pit type optical disc.

なお、上述のように光ディスクの番地信号の検出をＤＰＤ信号１９ａ、１９ｂに基づいて行う方法に代えて、未記録時のＴＥ信号１８ａの振幅が大きく、記録後でも記録マークが番地信号プリピット５Ａ１から外れた場合にはＴＥ信号１８ｂの振幅が大きいことを利用した方法も適用可能である。例えば、番地信号の検出を、未記録領域ではＴＥ信号１８ａに基づいて、記録領域ではＤＰＤ信号１９ｂに基づいて行うことができる。あるいは、未記録領域、記録領域のいずれもＴＥ信号１８ａ、１８ｂ、ＤＰＤ信号１９ａ、１９ｂに基づく検出を行い、番地信号が検出された側を採用する形態とすることもできる。   Instead of the method of detecting the address signal of the optical disk based on the DPD signals 19a and 19b as described above, the amplitude of the TE signal 18a when not recorded is large, and the recording mark is recorded from the address signal prepit 5A1 even after recording. In the case of deviation, a method using the fact that the amplitude of the TE signal 18b is large is also applicable. For example, the address signal can be detected based on the TE signal 18a in the unrecorded area and based on the DPD signal 19b in the recorded area. Alternatively, both the unrecorded area and the recorded area may be detected based on the TE signals 18a and 18b and the DPD signals 19a and 19b, and the side on which the address signal is detected may be adopted.

またこの場合に、実施の形態１と同様、ＴＥ信号やＤＰＤ信号の代わりに、いわゆる２チャンネルのＤＰＤ信号を用いることもでき、これらのうちのいずれか一つを状況に応じて選別して、番地信号の検出に用いることが可能である。   In this case, as in the first embodiment, a so-called two-channel DPD signal can be used instead of the TE signal or the DPD signal, and one of these is selected according to the situation, It can be used for detecting an address signal.

（実施の形態３）
以下に、本発明の実施形態３について、図８および図９を参照して説明する。なお実施の形態１と共通の要素については、同一の番号を付して説明する。本実施の形態は光ディスクの番地信号プリピットの形状が異なるだけで、光ディスク装置は実施の形態１と全く同じであり、その説明を省略する。本実施の形態では、光ディスクの番地信号の検出を、未記録領域ではＴＥ信号に基づいて、記録領域ではＴＥ信号とＤＰＤ信号の２者択一に基づいて行う。 (Embodiment 3)
The third embodiment of the present invention will be described below with reference to FIGS. In addition, about the element which is common in Embodiment 1, the same number is attached | subjected and demonstrated. In this embodiment, only the shape of the address signal prepit of the optical disk is different, and the optical disk apparatus is exactly the same as in the first embodiment, and the description thereof is omitted. In the present embodiment, the address signal of the optical disc is detected based on the TE signal in the unrecorded area and based on one of the TE signal and the DPD signal in the recording area.

本実施形態の番地信号プリピットは、図１１に示した従来例の場合と寸法が異なるだけで、形状は同じである。従って、番地信号プリピットについては図１１を参照して説明する。番地信号プリピット５Ａは案内溝５Ｇと同じ高さを保ち、案内溝５Ｇから片側のランド部５Ｌの領域に突出した形状をなす。このプリピット５Ａを、所定の規則に沿ってディスク信号面５Ｓ上に配置することで、信号面５Ｓ上に番地を割り当てている。集光スポット６Ｓが案内溝５Ｇ上を走査する場合、この番地信号プリピット５Ａの存在によって、未記録時にはＴＥ信号、記録時にはＴＥ信号又はＤＰＤ信号が影響を受ける。   The address signal prepit of this embodiment is the same in shape as the conventional example shown in FIG. Therefore, the address signal pre-pit will be described with reference to FIG. The address signal pre-pit 5A maintains the same height as the guide groove 5G and has a shape protruding from the guide groove 5G to the area of the land portion 5L on one side. The pre-pits 5A are arranged on the disc signal surface 5S in accordance with a predetermined rule, whereby addresses are assigned on the signal surface 5S. When the focused spot 6S scans on the guide groove 5G, the presence of the address signal prepit 5A affects the TE signal when not recorded, and the TE signal or DPD signal when recorded.

図８は、未記録領域における番地信号プリピット５Ａ前後での、ＴＥ信号波形２０ａおよびＤＰＤ信号波形２１ａを示している。ただし、これらの波形を測定した際の条件は、光源１の波長λは０．６６μｍ，対物レンズ４のＮＡは０．６２，案内溝５Ｇとプリピット５Ａとの光学的深さｄは７λ／７２，案内溝５Ｇのピッチｐは０．７４μｍ，案内溝５Ｇの幅ｗは０．３０μｍ，突起部寸法ａは０．３７μｍ，突起部長さｂは４Ｔである。クロック周波数Ｔは０．１３３μｍに相当する。以上のとおり、本実施形態においては突起部寸法ａが、従来例における突起部寸法ａより大きい。   FIG. 8 shows the TE signal waveform 20a and the DPD signal waveform 21a before and after the address signal prepit 5A in the unrecorded area. However, the conditions for measuring these waveforms are as follows: the wavelength λ of the light source 1 is 0.66 μm, the NA of the objective lens 4 is 0.62, and the optical depth d between the guide groove 5G and the prepit 5A is 7λ / 72. The pitch p of the guide groove 5G is 0.74 μm, the width w of the guide groove 5G is 0.30 μm, the protrusion dimension a is 0.37 μm, and the protrusion length b is 4T. The clock frequency T corresponds to 0.133 μm. As described above, in the present embodiment, the protrusion dimension a is larger than the protrusion dimension a in the conventional example.

番地信号プリピット５ＡによりＴＥ信号波形２０ａに大きな振幅が発生し、この振幅波形を適当なスライスレベルと比較し検出することで番地信号を検出できる。なお従来例と同様、ＤＰＤ信号波形２１ａはプリピット５Ａによる影響を受けず、振幅は小さい。   A large amplitude is generated in the TE signal waveform 20a by the address signal prepit 5A, and the address signal can be detected by comparing the amplitude waveform with an appropriate slice level. As in the conventional example, the DPD signal waveform 21a is not affected by the pre-pit 5A and has a small amplitude.

図９は、記録済領域における番地信号プリピット５Ａ前後での、ＴＥ信号波形２０ｂおよびＤＰＤ信号波形２１ｂを示している。記録によって案内溝５Ｇとプリピット５Ａとの光学的深さｄがλ／４となった場合に相当する。同図から明らかなように、記録後のＴＥ信号波形２０ｂは、プリピット５Ａの存在にも関わらず従来例と同様にほとんど振幅がゼロの状態となる。これに対して、ＤＰＤ信号波形２１ｂは信号振幅が大きく増幅している。   FIG. 9 shows the TE signal waveform 20b and the DPD signal waveform 21b before and after the address signal prepit 5A in the recorded area. This corresponds to the case where the optical depth d between the guide groove 5G and the prepit 5A is λ / 4 by recording. As can be seen from the figure, the TE signal waveform 20b after recording is almost zero in amplitude as in the conventional example, regardless of the presence of the prepit 5A. On the other hand, the signal amplitude of the DPD signal waveform 21b is greatly amplified.

以上のとおり、本実施形態においては、未記録領域ではＴＥ信号振幅２０ａが大きく、記録によってＤＰＤ信号波形２１ｂの振幅が大きく増幅する傾向にある。従って、番地信号の検出を未記録領域ではＴＥ信号波形２０ａ、記録領域ではＴＥ信号波形２０ｂ、ＤＰＤ信号波形２１ｂに基づく検出を行い、番地信号が検出された側を採用する形態をとる。それにより、記録前は当然、記録後であっても番地信号の読み誤りの発生が抑制される。   As described above, in the present embodiment, the TE signal amplitude 20a is large in the unrecorded area, and the amplitude of the DPD signal waveform 21b tends to be greatly amplified by recording. Accordingly, the address signal is detected based on the TE signal waveform 20a in the unrecorded area, the TE signal waveform 20b and the DPD signal waveform 21b in the recorded area, and the side on which the address signal is detected is adopted. As a result, the occurrence of an address signal read error is naturally suppressed before recording, even after recording.

さらに、本実施形態において、光ディスクの番地プリピット５ＡでのＴＥ信号波形２０ａ、２０ｂは従来例における波形と変わらない。従って、プリピット位置を従来例での位置と統一しておけば、ＴＥ信号だけで番地信号を検出する従来例の光ディスク装置にも、本実施形態による光ディスクを使用することができ、ドライブ互換性を確保できるメリットがある。   Further, in the present embodiment, the TE signal waveforms 20a and 20b at the address pre-pit 5A of the optical disc are the same as those in the conventional example. Therefore, if the pre-pit position is unified with the position in the conventional example, the optical disk according to the present embodiment can be used for the optical disk apparatus of the conventional example that detects the address signal only by the TE signal. There is a merit that can be secured.

なお、以上の３つの実施形態の説明では、プリピット形状を直線で囲まれた図形で代表して表したが、角を丸めたり、図示した図形に近接した曲線に置き換えたりすることも可能である。また、境界線近くのプリピット高さが不均一であってもよい。そのように変形した形態を用いた場合でも、上述の実施の形態と同様の効果が得られる。   In the description of the above three embodiments, the pre-pit shape is represented by a figure surrounded by a straight line. However, the corners may be rounded or replaced with a curve close to the illustrated figure. . Further, the prepit height near the boundary line may be non-uniform. Even when such a modified form is used, the same effects as those of the above-described embodiment can be obtained.

本発明によれば、予め光ディスクに記録した番地情報を正確に読み取ることができるため、従来構成の光ディスクと互換性を維持できる新規な光ディスクに適用できる。   According to the present invention, since the address information recorded in advance on the optical disk can be read accurately, the present invention can be applied to a new optical disk that can maintain compatibility with a conventional optical disk.

本発明の実施の形態１における光ディスクの番地信号プリピットの形状を示す平面図The top view which shows the shape of the address signal prepit of the optical disk in Embodiment 1 of this invention 同光ディスクの番地信号プリピットの他の形状を示す平面図The top view which shows the other shape of the address signal prepit of the same optical disk 同光ディスクの未記録領域における番地信号プリピット前後を再生したときのＤＰＤ信号波形、２ｃｈ−ＤＰＤ信号波形、およびＴＥ信号波形の一例を示す図The figure which shows an example of the DPD signal waveform, 2ch-DPD signal waveform, and TE signal waveform when reproducing | regenerating before and after the address signal prepit in the unrecorded area | region of the same optical disk 同光ディスクの記録済領域における番地信号プリピット前後を再生したときのＤＰＤ信号波形、２ｃｈ−ＤＰＤ信号波形、およびＴＥ信号波形の一例を示す図The figure which shows an example of the DPD signal waveform, 2ch-DPD signal waveform, and TE signal waveform when reproducing | regenerating before and after the address signal prepit in the recorded area | region of the same optical disk 同光ディスクの未記録の領域における番地信号プリピットの前後を、隣接するトラックを走査する光スポットで再生した時のＤＰＤ信号波形、２ｃｈ−ＤＰＤ信号波形、およびＴＥ信号波形の一例を示す図The figure which shows an example of the DPD signal waveform, 2ch-DPD signal waveform, and TE signal waveform at the time of reproducing | regenerating with the optical spot which scans an adjacent track before and after the address signal prepit in the unrecorded area | region of the same optical disk 本発明の実施の形態２における光ディスクの番地信号プリピットの形状を示す平面図FIG. 7 is a plan view showing the shape of an address signal prepit of an optical disc in Embodiment 2 of the present invention. 同光ディスクの未記録領域における番地信号プリピット前後を再生したときのＤＰＤ信号波形およびＴＥ信号波形の一例を示す図The figure which shows an example of the DPD signal waveform and TE signal waveform when reproducing | regenerating before and after the address signal prepit in the unrecorded area | region of the same optical disk 同光ディスクの記録済領域における番地信号プリピット前後を再生したときのＤＰＤ信号波形およびＴＥ信号波形の一例を示す図The figure which shows an example of the DPD signal waveform and TE signal waveform when reproducing | regenerating before and after the address signal prepit in the recorded area | region of the same optical disk 本発明の実施の形態３の光ディスクの未記録領域における番地信号プリピット前後を再生したときのＤＰＤ信号波形およびＴＥ信号波形の一例を示す図The figure which shows an example of the DPD signal waveform and TE signal waveform when reproducing | regenerating before and after the address signal prepit in the unrecorded area | region of the optical disk of Embodiment 3 of this invention 同光ディスクの記録済領域における番地信号プリピット前後を再生したときのＤＰＤ信号波形およびＴＥ信号波形の一例を示す図The figure which shows an example of the DPD signal waveform and TE signal waveform when reproducing | regenerating before and after the address signal prepit in the recorded area | region of the same optical disk （ａ）は従来例および本発明の実施の形態における光ディスク装置の要部の構成を示す図、（ｂ）は光ディスク信号面上を光スポットが走査する状態を示す平面図、（ｃ）は光検出器上における光スポット検出の形態を示す平面図、（ｄ）は光検出器上における光スポット検出の他の形態を示す平面図(A) is a figure which shows the structure of the principal part of the optical disk apparatus in a prior art example and embodiment of this invention, (b) is a top view which shows the state which a light spot scans on the optical disk signal surface, (c) is light The top view which shows the form of the light spot detection on a detector, (d) is a top view which shows the other form of the light spot detection on a photodetector 従来例の光ディスクの番地信号プリピットの形状を示す平面図Plan view showing the shape of the address signal pre-pit of the optical disc of the conventional example 同光ディスクの未記録領域における番地信号プリピット前後を再生したときのＤＰＤ信号波形およびＴＥ信号波形の一例を示す図The figure which shows an example of the DPD signal waveform and TE signal waveform when reproducing | regenerating before and after the address signal prepit in the unrecorded area | region of the same optical disk 同光ディスクの記録済領域における番地信号プリピット前後を再生したときのＤＰＤ信号波形およびＴＥ信号波形の一例を示す図The figure which shows an example of the DPD signal waveform and TE signal waveform when reproducing | regenerating before and after the address signal prepit in the recorded area | region of the same optical disk 光ディスクの案内溝およびプリピットの光学的深さと、検出信号振幅との関係を示す図The figure which shows the relationship between the optical depth of the guide groove and prepit of an optical disk, and detection signal amplitude

符号の説明Explanation of symbols

１ 光源
２ ビームスプリッタ
２ａ スプリット面
３ コリメートレンズ
４ 対物レンズ
５ 光ディスク基材
５Ａ、５Ｂ、５Ａ１ 番地信号プリピット
５Ｃ、５Ｄ 断絶領域
５Ｇ 案内溝
５Ｓ 光ディスク信号面
６ 集束光
６Ｓ 集光スポット
７ 光検出器
７ａ、７ｂ、７ｃ、７ｄ 光検出素子
８ 集束光
８ａ、８ｂ、８ｃ、８ｄ 集光スポット
８ａ’、８ｂ’、８ｃ’、８ｄ’ 集光スポット
９ ホログラム
１０ａ〜ｂ、１５ａ〜ｃ、１８ａ〜ｂ、２０ａ〜ｂ ＴＥ信号波形
１１ａ〜ｂ、１６ａ〜ｃ、１９ａ〜ｂ、２１ａ〜ｂ ＤＰＤ信号波形
１２ ＴＥ信号振幅
１３ ＲＦ信号振幅
１４ ＤＰＤ信号振幅
１７ａ〜ｂ ２ｃｈ−ＤＰＤ信号波形 DESCRIPTION OF SYMBOLS 1 Light source 2 Beam splitter 2a Split surface 3 Collimating lens 4 Objective lens 5 Optical disk base material 5A, 5B, 5A1 Address signal prepit 5C, 5D Broken area 5G Guide groove 5S Optical disk signal surface 6 Focused light 6S Condensing spot 7 Photo detector 7a , 7b, 7c, 7d Photodetecting element 8 Focused light 8a, 8b, 8c, 8d Condensing spot 8a ', 8b', 8c ', 8d' Condensing spot 9 Holograms 10a-b, 15a-c, 18a-b, 20a-b TE signal waveform 11a-b, 16a-c, 19a-b, 21a-b DPD signal waveform 12 TE signal amplitude 13 RF signal amplitude 14 DPD signal amplitude 17a-b 2ch-DPD signal waveform

Claims (9)

円板状の基板の径方向にピッチｐの周期をなしながら円周方向に沿って形成された案内溝を有し、前記案内溝に沿って前記案内溝間にプリピットが形成され、所定の規則に従った前記プリピットの配置により、信号面の各位置に割り当てた番地信号を表すように構成された光ディスクにおいて、
前記プリピットは、前記案内溝の両側にそれぞれ形成された一対のプリピットを単位として構成され、前記一対のプリピットは互いに円周方向に沿って位置がずれており、円周方向における前記一対のプリピットの各端縁のうち、両プリピット間の内側となる各端縁の間の距離が、前記案内溝のピッチｐ以下であることを特徴とする光ディスク。 A guide groove formed along the circumferential direction with a pitch p in the radial direction of the disk-shaped substrate, and prepits are formed between the guide grooves along the guide groove, and a predetermined rule In the optical disk configured to represent the address signal assigned to each position on the signal surface by the arrangement of the prepits according to
The pre-pits are configured with a pair of pre-pits formed on both sides of the guide groove as a unit, and the pair of pre-pits are displaced from each other along the circumferential direction. An optical disc characterized in that a distance between each end edge, which is an inner side between both pre-pits, is equal to or less than a pitch p of the guide groove. 前記一対のプリピットのうち、前記案内溝の片側の前記プリピットと、前記案内溝の他方の側の前記プリピットの円周方向に於ける配置順序により、前記番地信号の情報の一部が構成される請求項１記載の光ディスク。   Of the pair of prepits, a part of the information of the address signal is configured by the arrangement order in the circumferential direction of the prepit on one side of the guide groove and the prepit on the other side of the guide groove. The optical disk according to claim 1. 円板状の基板の径方向にピッチｐの周期をなしながら円周方向に沿って形成された案内溝を有し、前記案内溝に沿って前記案内溝間にプリピットが形成され、所定の規則に従った前記プリピットの配置により、記録面の各位置に割り当てた番地信号を表すように構成された光ディスクにおいて、
前記プリピットが形成されている領域の一部において、前記案内溝部分が断絶している断絶領域を有することを特徴とする光ディスク。 A guide groove formed along the circumferential direction with a pitch p in the radial direction of the disk-shaped substrate, and prepits are formed between the guide grooves along the guide groove, and a predetermined rule In the optical disc configured to represent the address signal assigned to each position on the recording surface by the arrangement of the prepits according to
An optical disc characterized in that a part of a region where the pre-pit is formed has a cut-off region where the guide groove portion is cut off. 円周方向における前記案内溝の断絶領域の長さである断絶幅が０．５ｐ以上である請求項３記載の光ディスク。   4. The optical disc according to claim 3, wherein a break width which is a length of a break region of the guide groove in the circumferential direction is 0.5 p or more. 光源と、複数の受光素子を有する光検出器と、前記光源からの光束を光ディスク上に集束させ前記光ディスクからの反射光を前記光検出器上に集束させる光学系と、前記光検出器の出力に基づき前記光束に対するフォーカス制御を行うフォーカス制御部と、前記光検出器の出力に基づき前記光束に対するトラッキング制御を行うトラッキング制御部と、前記光検出器の出力から前記光ディスクの信号面の各位置に割り当てた番地信号を検出するアドレス検出部とを備え、
請求項１〜４のいずれか１項に記載の前記光ディスクが装填され、前記アドレス検出部は、前記光ディスク上の前記プリピットに基づく前記光検出器の出力から前記番地信号を検出する光ディスク装置において、
前記光ディスクの径方向及び円周方向に沿った直線で４分割される４つの領域Ａ，Ｂ，Ｃ，Ｄを、領域Ａ，Ｂ間を分割する直線の方向を円周方向として、時計回りに領域Ａ，Ｂ，Ｃ，Ｄが定義されたとき、
前記光ディスクの領域Ａ，Ｂ，Ｃ，Ｄからの反射光は、前記光検出器を構成する前記複数の受光素子上に各々別個に投射されて、それぞれ検出信号ａ，ｂ，ｃ，ｄが生成され、
｛（ａ＋ｃ）−（ｂ＋ｄ）｝により算出されるＤＰＤ信号を前記番地信号の検出に用いることを特徴とする光ディスク装置。 A light source, a photodetector having a plurality of light receiving elements, an optical system for focusing a light beam from the light source on an optical disc and focusing reflected light from the optical disc on the photodetector, and an output of the photodetector A focus control unit that performs focus control on the light beam based on the output, a tracking control unit that performs tracking control on the light beam based on the output of the photodetector, and a position on the signal surface of the optical disc from the output of the photodetector. An address detector for detecting the assigned address signal,
The optical disc according to any one of claims 1 to 4, wherein the address detection unit detects the address signal from an output of the photodetector based on the pre-pits on the optical disc.
The four areas A, B, C, and D divided into four by a straight line along the radial direction and the circumferential direction of the optical disc are clockwise, with the direction of the straight line dividing the areas A and B as the circumferential direction. When regions A, B, C, and D are defined,
Reflected light from areas A, B, C, and D of the optical disk is projected separately onto the plurality of light receiving elements constituting the photodetector, and detection signals a, b, c, and d are generated, respectively. And
An optical disc apparatus characterized by using a DPD signal calculated by {(a + c)-(b + d)} for detection of the address signal. 光源と、複数の受光素子を有する光検出器と、前記光源からの光束を光ディスク上に集束させ前記光ディスクからの反射光を前記光検出器上に集束させる光学系と、前記光検出器の出力に基づき前記光束に対するフォーカス制御を行うフォーカス制御部と、前記光検出器の出力に基づき前記光束に対するトラッキング制御を行うトラッキング制御部と、前記光検出器の出力から前記光ディスクの信号面の各位置に割り当てた番地信号を検出するアドレス検出部とを備え、
請求項１〜４のいずれか１項に記載の前記光ディスクが装填され、前記アドレス検出部は、前記光ディスク上の前記プリピットに基づく前記光検出器の出力から前記番地信号を検出する光ディスク装置において、
前記光ディスクの径方向及び円周方向に沿った直線で４分割される４つの領域Ａ，Ｂ，Ｃ，Ｄを、領域Ａ，Ｂ間を分割する直線の方向を円周方向として、時計回りに領域Ａ，Ｂ，Ｃ，Ｄが定義されたとき、
前記光ディスクの領域Ａ，Ｂ，Ｃ，Ｄからの反射光は、前記光検出器を構成する前記複数の受光素子上に各々別個に投射されて、それぞれ検出信号ａ，ｂ，ｃ，ｄが生成され、
｛（ａ＋ｄ）−（ｂ＋ｃ）｝により算出されるＴＥ信号と、｛（ａ＋ｃ）−（ｂ＋ｄ）｝により算出されるＤＰＤ信号のうち、いずれか一方を検出状況に応じて選択して前記番地信号の検出に用いることを特徴とする光ディスク装置。 A light source, a photodetector having a plurality of light receiving elements, an optical system for focusing a light beam from the light source on the optical disc and focusing reflected light from the optical disc on the photodetector, and an output of the photodetector A focus control unit that performs focus control on the light beam based on the output, a tracking control unit that performs tracking control on the light beam based on the output of the photodetector, and a position on the signal surface of the optical disc from the output of the photodetector. An address detector for detecting the assigned address signal,
The optical disc according to any one of claims 1 to 4, wherein the address detection unit detects the address signal from an output of the photodetector based on the pre-pits on the optical disc.
The four areas A, B, C, and D divided into four by a straight line along the radial direction and the circumferential direction of the optical disc are clockwise, with the direction of the straight line dividing the areas A and B as the circumferential direction. When regions A, B, C, and D are defined,
Reflected light from areas A, B, C, and D of the optical disc is projected separately onto the plurality of light receiving elements constituting the photodetector, and detection signals a, b, c, and d are generated, respectively. And
Either one of the TE signal calculated by {(a + d) − (b + c)} and the DPD signal calculated by {(a + c) − (b + d)} is selected according to the detection situation, and the address signal is selected. Used for detection of an optical disk device. 前記光ディスクが未記録状態である場合には、前記ＴＥ信号を前記番地信号の検出に用い、
前記光ディスクが記録済状態である場合には、前記ＴＥ信号と前記ＤＰＤ信号のうちの信号品質の良い方を選択して前記番地信号の検出に用いる請求項６記載の光ディスク装置。 When the optical disc is in an unrecorded state, the TE signal is used for detection of the address signal,
7. The optical disc apparatus according to claim 6, wherein when the optical disc is in a recorded state, the one having the better signal quality of the TE signal and the DPD signal is selected and used for the detection of the address signal. 光源と、複数の受光素子を有する光検出器と、前記光源からの光束を光ディスク上に集束させ前記光ディスクからの反射光を前記光検出器上に集束させる光学系と、前記光検出器の出力に基づき前記光束に対するフォーカス制御を行うフォーカス制御部と、前記光検出器の出力に基づき前記光束に対するトラッキング制御を行うトラッキング制御部と、前記光検出器の出力から前記光ディスクの信号面の各位置に割り当てた番地信号を検出するアドレス検出部とを備え、
請求項１〜４のいずれか１項に記載の前記光ディスクが装填され、前記アドレス検出部は、前記光ディスク上の前記プリピットに基づく前記光検出器の出力から前記番地信号を検出する光ディスク装置において、
前記光ディスクの径方向及び円周方向に沿った直線で４分割される４つの領域Ａ，Ｂ，Ｃ，Ｄを、領域Ａ，Ｂ間を分割する直線の方向を円周方向として、時計回りに領域Ａ，Ｂ，Ｃ，Ｄが定義されたとき、
前記光ディスクの領域Ａ，Ｂ，Ｃ，Ｄからの反射光は、前記光検出器を構成する前記複数の受光素子上に各々別個に投射されて、それぞれ検出信号ａ，ｂ，ｃ，ｄが生成され、
｛（ａ＋ｄ）−（ｂ＋ｃ）｝により算出されるＴＥ信号と、｛（ａ＋ｃ）−（ｂ＋ｄ）｝により算出されるＤＰＤ信号と、（ａ−ｂ）または（ｃ−ｄ）により算出される２ｃｈ−ＤＰＤ信号のうち、いずれか一方を検出状況に応じて選択して前記番地信号の検出に用いることを特徴とする光ディスク装置。 A light source, a photodetector having a plurality of light receiving elements, an optical system for focusing a light beam from the light source on the optical disc and focusing reflected light from the optical disc on the photodetector, and an output of the photodetector A focus control unit that performs focus control on the light beam based on the output, a tracking control unit that performs tracking control on the light beam based on the output of the photodetector, and a position on the signal surface of the optical disc from the output of the photodetector. An address detector for detecting the assigned address signal,
The optical disc according to any one of claims 1 to 4, wherein the address detection unit detects the address signal from an output of the photodetector based on the pre-pits on the optical disc.
The four areas A, B, C, and D divided into four by a straight line along the radial direction and the circumferential direction of the optical disc are clockwise, with the direction of the straight line dividing the areas A and B as the circumferential direction. When regions A, B, C, and D are defined,
Reflected light from areas A, B, C, and D of the optical disk is projected separately onto the plurality of light receiving elements constituting the photodetector, and detection signals a, b, c, and d are generated, respectively. And
TE signal calculated by {(a + d) − (b + c)}, DPD signal calculated by {(a + c) − (b + d)}, and 2ch calculated by (a−b) or (c−d) An optical disc apparatus characterized in that one of the DPD signals is selected according to a detection situation and used for detection of the address signal. 前記光ディスクが未記録状態である場合には、前記ＴＥ信号を前記番地信号の検出に用い、
前記光ディスクが記録済状態である場合には、前記ＴＥ信号と、前記ＤＰＤ信号と、前記２ｃｈ−ＤＰＤ信号のうちの信号品質の良い方を選択して前記番地信号の検出に用いる請求項８記載の光ディスク装置。 When the optical disc is in an unrecorded state, the TE signal is used for detection of the address signal,
9. When the optical disc is in a recorded state, the one having the better signal quality among the TE signal, the DPD signal, and the 2ch-DPD signal is selected and used for detecting the address signal. Optical disk device.
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