JP4214944B2

JP4214944B2 - Optical information recording / reproducing apparatus

Info

Publication number: JP4214944B2
Application number: JP2004122561A
Authority: JP
Inventors: 政利矢島; 彰洋坂口
Original assignee: Panasonic Corp; Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Corp; Panasonic Holdings Corp
Priority date: 2004-04-19
Filing date: 2004-04-19
Publication date: 2009-01-28
Anticipated expiration: 2024-04-19
Also published as: JP2005310220A

Description

本発明は、光情報記録媒体（以下、光ディスクと称する）の情報層に光学的に情報の記録、再生を行う光情報記録再生装置に関するものである。 The present invention relates to an optical information recording / reproducing apparatus for optically recording and reproducing information on an information layer of an optical information recording medium (hereinafter referred to as an optical disk).

従来の光情報記録再生装置としては、温度センサによって検出された周囲温度に基づき、情報信号の出力振幅を適正値に調整して、フォーカス引き込み動作を行うものがあった（例えば、特許文献１参照）。 As a conventional optical information recording / reproducing apparatus, there is one that performs a focus pull-in operation by adjusting an output amplitude of an information signal to an appropriate value based on an ambient temperature detected by a temperature sensor (see, for example, Patent Document 1). ).

図１２は前記特許文献１に記載された従来の光情報記録再生装置の構成を模式的に示す図である。図１２において、この光情報記録再生装置は、情報が記録されている光ディスク１０１に光ビームをあて、その反射光を受光して信号を出力する光ピックアップ１０３と、光ピックアップ１０３の出力信号を基にフォーカスエラー信号や情報信号等を生成して出力するＲＦアンプ１０５と、温度を電圧値に変換する温度センサ１０８で構成されている。この構成にて、光ディスク１０１の情報を光ピックアップ１０３で読みとった信号を入力として、フォーカスエラー信号等の情報信号を抽出し、温度センサ１０８によって検出された周囲温度に基づき増幅率を可変して出力する機能を持つＲＦアンプ１０５により、情報信号の出力振幅を適正値に調整するという機能を有していた。 FIG. 12 is a diagram schematically showing a configuration of a conventional optical information recording / reproducing apparatus described in Patent Document 1. In FIG. In FIG. 12, this optical information recording / reproducing apparatus applies an optical beam to an optical disc 101 on which information is recorded, receives the reflected light and outputs a signal, and an output signal of the optical pickup 103. An RF amplifier 105 that generates and outputs a focus error signal, an information signal, and the like, and a temperature sensor 108 that converts the temperature into a voltage value. With this configuration, a signal obtained by reading information on the optical disc 101 with the optical pickup 103 is input, an information signal such as a focus error signal is extracted, and the amplification factor is varied based on the ambient temperature detected by the temperature sensor 108 and output. The function of adjusting the output amplitude of the information signal to an appropriate value by the RF amplifier 105 having the function of

図１３は、特開平０６−２７４９１２号公報（特許文献２）に開示された従来の他の光情報記録再生装置の構成を模式的に示す図である。この光情報記録再生装置は、情報が記録されている光ディスク１２１に光ビームをあて、その反射光を受光して信号を出力する光ピックアップ１２３と、光ピックアップ１２３からの信号に対し周波数特性の設定を行うループフィルタ１３０と、ループフィルタ１３０の出力を電流増幅して光ピックアップ１２３に設けたフォーカスアクチュエータ１２３ａとトラッキングアクチュエータ１２３ｂを駆動する駆動手段１２９と、光ピックアップ１２３の温度を検出する温度センサ１２８で構成されている。この構成にて、光ピックアップ１２３の温度を温度センサ１２８で検出し、検出した温度に応じてコントローラ１３１が制御手段１２７のループフィルタ１３０の周波数特性を、温度によるフォーカスアクチュエータ１２３ａの低域駆動感度の最適値からのずれを適正値に調整するという機能を有していた。
特開平０９−１６９７４号公報特開平０６−２７４９１２号公報 FIG. 13 is a diagram schematically showing the configuration of another conventional optical information recording / reproducing apparatus disclosed in Japanese Patent Laid-Open No. 06-274912 (Patent Document 2). This optical information recording / reproducing apparatus applies an optical beam to an optical disc 121 on which information is recorded, receives the reflected light and outputs a signal, and sets frequency characteristics for the signal from the optical pickup 123. A loop filter 130 for performing the above, a driving means 129 for driving the focus actuator 123a and the tracking actuator 123b provided in the optical pickup 123 by amplifying the output of the loop filter 130, and a temperature sensor 128 for detecting the temperature of the optical pickup 123. It is configured. With this configuration, the temperature of the optical pickup 123 is detected by the temperature sensor 128, and the controller 131 determines the frequency characteristics of the loop filter 130 of the control means 127 according to the detected temperature, and the low-frequency driving sensitivity of the focus actuator 123a according to the temperature. It had a function of adjusting the deviation from the optimum value to an appropriate value.
Japanese Patent Laid-Open No. 09-16974 Japanese Patent Laid-Open No. 06-274912

しかしながら、前記した特許文献１に開示の構成では、光ピックアップ１０３の周辺温度を検出するために温度センサ１０８を構成しなければならず、部品点数が増えるという課題がある。 However, in the configuration disclosed in Patent Document 1 described above, the temperature sensor 108 must be configured to detect the ambient temperature of the optical pickup 103, and there is a problem that the number of components increases.

また、光ピックアップ１０３の温度を正確に検出するためには、温度センサ１０８の取り付け位置においても、例えば光源付近に配置しなければならないといった配慮が必要となるという課題を有していた。 Further, in order to accurately detect the temperature of the optical pickup 103, there is a problem that it is necessary to consider, for example, that the temperature sensor 108 must be disposed near the light source.

そして図１３を参照して前述した特許文献２に開示の構成では、光ピックアップ１２３の周辺温度を検出するために温度センサ１２８を構成しなければならず、部品点数が増えるという課題がある。 In the configuration disclosed in Patent Document 2 described above with reference to FIG. 13, the temperature sensor 128 must be configured to detect the ambient temperature of the optical pickup 123, and there is a problem that the number of components increases.

また、駆動手段１２９からの電流増幅による温度変動に対しフォーカスアクチュエータ１２３ａの低域駆動感度の変動を補正する周波数特性調整を行っても、フォーカスアクチュエータ１２３ａとトラッキングアクチュエータ１２３ｂの発熱の影響で発生する光ピックアップ１２３の光学部品の光学収差を補正することはできないという課題がある。 Further, even if the frequency characteristic adjustment for correcting the fluctuation of the low-frequency driving sensitivity of the focus actuator 123a is performed with respect to the temperature fluctuation due to the current amplification from the driving unit 129, the light generated due to the heat generated by the focus actuator 123a and the tracking actuator 123b. There is a problem that the optical aberration of the optical component of the pickup 123 cannot be corrected.

また、フォーカスアクチュエータ１２３ａとトラッキングアクチュエータ１２３ｂの温度を検出しなければならないため、温度センサ１２８の配置はフォーカスアクチュエータ１２３ａとトラッキングアクチュエータ１２３ｂの付近に配置しなければならず、構成に制限があるとともに、フォーカスアクチュエータ１２３ａとトラッキングアクチュエータ１２３ｂの局部的な温度検出ができても光ピックアップ１２３の例えば光源などの部位の温度検出ができないという課題を有していた。 Further, since the temperatures of the focus actuator 123a and the tracking actuator 123b must be detected, the temperature sensor 128 must be disposed in the vicinity of the focus actuator 123a and the tracking actuator 123b. Even if the local temperature detection of the actuator 123a and the tracking actuator 123b can be performed, there is a problem that the temperature of a part such as a light source of the optical pickup 123 cannot be detected.

本発明は、前記従来の課題を解決するもので、駆動モニタ手段によりモニタされた電流もしくは電圧の大きさによって、駆動開始から所定の時間までの間に所定の回数フォーカス焦点補正を行うことにより、光ピックアップに発生した熱による光学収差変動を補正し、安定して光スポットの制御を行うことができ、記録特性、再生特性に優れた光情報記録再生装置を提供することを目的とする。 The present invention solves the above-mentioned conventional problems, and performs focus focus correction a predetermined number of times from the start of driving to a predetermined time according to the magnitude of the current or voltage monitored by the drive monitoring means, An object of the present invention is to provide an optical information recording / reproducing apparatus that can correct optical aberration fluctuations caused by heat generated in an optical pickup, stably control a light spot, and has excellent recording characteristics and reproducing characteristics.

前記従来課題を解決するために、本発明に係る光情報記録再生装置は、光ピックアップが、レーザー光を出射する光源と、前記光源から出射された前記レーザー光を平行光に変換するコリメートレンズと、前記コリメートレンズによって平行光に変換された前記レーザー光を集光して光情報記録媒体に光スポットを投影して焦点を結ぶ対物レンズと、前記光情報記録媒体を反射した光の光路を前記光源への光路と分離する光学素子と、前記光学素子により分離された光を受光し電気信号に変換する光検出器と、前記対物レンズと前記光学素子を保持するレンズ保持部材と、コイル手段と、前記コイル手段に対向して配置された磁石とで構成された光ピックアップと、前記コイル手段に電流もしくは電圧を印可して前記磁石とで発生する磁気回路により前記レンズ保持部材をフォーカス、トラッキング方向に駆動する駆動手段と、前記駆動手段による電流もしくは電圧をモニタする駆動モニタ手段と、前記光ピックアップからの電気信号をフォーカスエラー信号およびトラッキングエラー信号のサーボ信号に変換する信号処理手段と、前記信号処理手段からのサーボ信号により光スポットを光情報記録媒体に追従するよう前記駆動手段を制御する制御手段で構成された光情報記録再生装置であって、前記駆動モニタ手段によりモニタされた電流もしくは電圧の大きさによって、駆動開始から所定の時間までの間に所定の回数フォーカス焦点補正を行うことを特徴とする。 In order to solve the above-described conventional problems, an optical information recording / reproducing apparatus according to the present invention includes: an optical pickup; a light source that emits laser light; and a collimator lens that converts the laser light emitted from the light source into parallel light; An objective lens that focuses the laser beam converted into parallel light by the collimator lens and projects a light spot on the optical information recording medium, and an optical path of the light reflected from the optical information recording medium. An optical element that separates the optical path to the light source, a photodetector that receives the light separated by the optical element and converts it into an electrical signal, a lens holding member that holds the objective lens and the optical element, and coil means; An optical pickup composed of a magnet disposed opposite to the coil means, and a magnetic circuit generated by the magnet by applying a current or voltage to the coil means. Driving means for driving the lens holding member in the focus and tracking direction, drive monitoring means for monitoring the current or voltage by the driving means, and an electric signal from the optical pickup as a focus error signal and a tracking error signal servo signal. An optical information recording / reproducing apparatus comprising: signal processing means for converting into: and control means for controlling the driving means so as to follow a light spot with an optical information recording medium by a servo signal from the signal processing means, The focus focus correction is performed a predetermined number of times between the start of driving and a predetermined time according to the magnitude of the current or voltage monitored by the drive monitoring means.

本発明に係る光情報記録再生装置は、光ピックアップが、レーザー光を出射する光源と、前記光源から出射された前記レーザー光を平行光に変換するコリメートレンズと、前記コリメートレンズによって平行光に変換された前記レーザー光を集光して光情報記録媒体に光スポットを投影して焦点を結ぶ対物レンズと、前記光情報記録媒体を反射した光の光路を前記光源への光路と分離する光学素子と、前記光学素子により分離された光を受光し電気信号に変換する光検出器と、前記対物レンズと前記光学素子を保持するレンズ保持部材と、コイル手段と、前記コイル手段に対向して配置された磁石とで構成された光ピックアップと、前記コイル手段に電流もしくは電圧を印可して前記磁石とで発生する磁気回路により前記レンズ保持部材をフォーカス、トラッキング方向に駆動する駆動手段と、前記駆動手段による電流もしくは電圧をモニタする駆動モニタ手段と、前記光ピックアップからの電気信号をフォーカスエラー信号およびトラッキングエラー信号のサーボ信号に変換する信号処理手段と、前記信号処理手段からのサーボ信号により光スポットを光情報記録媒体に追従するよう前記駆動手段を制御する制御手段で構成された光情報記録再生装置であって、前記駆動手段により前記コイル手段の印可を開始して、前記駆動モニタ手段による電流もしくは電圧が所定の値となり、かつ駆動開始から所定の時間までの間に所定の回数フォーカス焦点補正を行うことを特徴とする。 In the optical information recording / reproducing apparatus according to the present invention, the optical pickup has a light source that emits laser light, a collimator lens that converts the laser light emitted from the light source into parallel light, and the collimator lens converts the light into parallel light. An objective lens that focuses the focused laser beam and projects a light spot onto an optical information recording medium to focus, and an optical element that separates the optical path of the light reflected from the optical information recording medium from the optical path to the light source A photodetector that receives the light separated by the optical element and converts it into an electrical signal, a lens holding member that holds the objective lens and the optical element, a coil unit, and a coil unit that faces the coil unit The lens holding member is supported by a magnetic circuit that is generated by the magnetic pickup generated by applying an electric current or voltage to the coil means and an optical pickup composed of a magnet formed by the magnet. Driving means for driving in the tracking direction, drive monitoring means for monitoring the current or voltage by the driving means, and signal processing means for converting the electrical signal from the optical pickup into a servo signal of a focus error signal and a tracking error signal And an optical information recording / reproducing apparatus configured to control the driving means so that a light spot follows the optical information recording medium by a servo signal from the signal processing means, and the coil means by the driving means Is applied, the current or voltage by the drive monitoring means becomes a predetermined value, and focus focus correction is performed a predetermined number of times from the start of driving to a predetermined time.

本発明によれば、駆動モニタ手段によりモニタされた電流もしくは電圧の大きさによって、駆動開始から所定の時間までの間に所定の回数フォーカス焦点補正を行うことにより、光ピックアップに発生した熱による光学収差変動を補正し、安定して光スポットの制御を行うことができ、記録特性、再生特性に優れていることを特徴とした光情報記録再生装置を提供することができる。 According to the present invention, by performing focus focus correction a predetermined number of times from the start of driving to a predetermined time according to the magnitude of the current or voltage monitored by the drive monitoring means, the optical due to the heat generated in the optical pickup is obtained. It is possible to provide an optical information recording / reproducing apparatus that can correct aberration variation, stably control the light spot, and is excellent in recording characteristics and reproducing characteristics.

本実施の形態に係る光情報記録再生装置においては、駆動モニタ手段によりモニタされた電流もしくは電圧の大きさによって、駆動開始から所定の時間までの間に所定の回数フォーカス焦点補正を行う機能を有している。このため、光ピックアップに発生した熱による光学収差変動を補正することができる。その結果、光ディスクを記録再生する光スポットのフォーカス点を適正位置に配置することができ、安定した記録再生特性を得ることができる。 The optical information recording / reproducing apparatus according to the present embodiment has a function of performing focus focus correction a predetermined number of times from the start of driving to a predetermined time according to the magnitude of the current or voltage monitored by the drive monitoring means. is doing. For this reason, optical aberration fluctuations due to heat generated in the optical pickup can be corrected. As a result, the focus point of the light spot for recording / reproducing the optical disc can be arranged at an appropriate position, and stable recording / reproducing characteristics can be obtained.

また本実施の形態に係る光情報記録再生装置においては、駆動手段によりコイル手段の印可を開始して、駆動モニタ手段による電流もしくは電圧が所定の値となり、かつ駆動開始から所定の時間までの間に所定の回数フォーカス焦点補正を行う機能を有している。このため、光ピックアップに時間とともに発生した熱による光学収差変動を補正することができる。その結果、光ディスクを記録再生する光スポットのフォーカス点を適正位置に配置することができ、安定した記録再生特性を得ることができる。 Also, in the optical information recording / reproducing apparatus according to the present embodiment, the application of the coil means is started by the driving means, the current or voltage by the drive monitoring means becomes a predetermined value, and the time from the start of driving to a predetermined time. And a function of performing focus focus correction a predetermined number of times. For this reason, it is possible to correct optical aberration fluctuations caused by heat generated over time in the optical pickup. As a result, the focus point of the light spot for recording / reproducing the optical disc can be arranged at an appropriate position, and stable recording / reproducing characteristics can be obtained.

この実施の形態では、前記光ピックアップの、対物レンズとコリメートレンズと光学素子との少なくとも１つは樹脂材料で生成されていることが好ましい。 In this embodiment, it is preferable that at least one of the objective lens, the collimating lens, and the optical element of the optical pickup is made of a resin material.

前記光ピックアップには、光ピックアップの温度をモニタする温度モニタ手段がさらに具備されていることが好ましい。 It is preferable that the optical pickup further includes temperature monitoring means for monitoring the temperature of the optical pickup.

前記光情報記録媒体には、アドレス情報が記録されるアドレス領域と前記情報が記録されるデータ領域とが配置されており、前記フォーカス焦点補正は、前記データ領域から前記情報を再生するときにおいてジッタが最適となる、もしくはＲＦ信号が最大となるよう複数段階フォーカス点を移動させることが好ましい。 In the optical information recording medium, an address area in which address information is recorded and a data area in which the information is recorded are arranged, and the focus focus correction performs jitter when reproducing the information from the data area. It is preferable to move the multistage focus point so that is optimal or the RF signal is maximized.

前記光情報記録媒体は円盤状であって、前記フォーカス焦点補正は、前記光情報記録媒体の内周領域と外周領域の、少なくとも１つの領域で行うことが好ましい。 It is preferable that the optical information recording medium has a disc shape, and the focus focus correction is performed in at least one of an inner peripheral area and an outer peripheral area of the optical information recording medium.

前記フォーカス焦点補正は、予め設定した大きさのフォーカス点移動量を、駆動開始から所定の時間までの間に所定の回数移動させることが好ましい。 In the focus focus correction, it is preferable that the focus point movement amount having a preset size is moved a predetermined number of times from the start of driving to a predetermined time.

前記光ピックアップの、前記コイル手段は、前記レンズ保持部材に巻き線された、もしくは板状に形成され前記レンズ保持部材に具備され、かつ前記コイル手段に対向して前記磁石が配置されていることが好ましい。 The coil means of the optical pickup is wound around the lens holding member or is formed in a plate shape and is provided on the lens holding member, and the magnet is disposed facing the coil means. Is preferred.

前記光ピックアップの、前記磁石は、前記レンズ保持部材に具備され、かつ前記磁石に対向して前記コイル手段が配置されていることが好ましい。 It is preferable that the magnet of the optical pickup is provided in the lens holding member, and the coil means is disposed to face the magnet.

以下、図面を参照して本発明の実施の形態を説明する。 Embodiments of the present invention will be described below with reference to the drawings.

（実施の形態１）
図１は、実施の形態１における光情報記録再生装置の構成を示す模式図であり、図２は実施の形態１における光情報記録再生装置の光ピックアップの構成を示す斜視図であり、図３は実施の形態１における光情報記録再生装置の光ピックアップの分解図であり、図４は実施の形態１における光情報記録再生装置の光ピックアップの、対物レンズ駆動装置の駆動電流と温度上昇の関係を示すグラフであり、図５は実施の形態１における光情報記録再生装置の光ピックアップの、温度と光学部品の収差の関係を示すグラフであり、図６は光学収差（球面収差）によるフォーカス点とジッタの関係を示すグラフであり、図７は実施の形態１における光情報記録再生装置のジッタによるフォーカス焦点補正方法の一例を示すグラフであり、図８は実施の形態１における光情報記録再生装置のＲＦ信号によるフォーカス焦点補正方法の一例を示すグラフである。 (Embodiment 1)
FIG. 1 is a schematic diagram showing the configuration of the optical information recording / reproducing apparatus in the first embodiment, and FIG. 2 is a perspective view showing the configuration of the optical pickup of the optical information recording / reproducing apparatus in the first embodiment. FIG. 4 is an exploded view of the optical pickup of the optical information recording / reproducing apparatus in the first embodiment, and FIG. 4 shows the relationship between the drive current of the objective lens driving apparatus and the temperature rise of the optical pickup of the optical information recording / reproducing apparatus in the first embodiment. FIG. 5 is a graph showing the relationship between the temperature and the aberration of the optical component of the optical pickup of the optical information recording / reproducing apparatus in the first embodiment, and FIG. 6 is a focus point due to the optical aberration (spherical aberration). FIG. 7 is a graph showing an example of a focus focus correction method using jitter in the optical information recording / reproducing apparatus in the first embodiment, and FIG. Is a graph showing an example of a focus focus correction method according to the RF signal of the optical information recording reproducing apparatus according to the first.

図１から図３において、半導体レーザーなどの光源１は、光源保持部材２によって保持され、光源調整部材３とともに基台１３に保持されている。光源１から出射されたレーザー光１ａの発散光を集光して平行光にするコリメートレンズ５は光軸に沿って調整され、基台１３に保持されている。コリメートレンズ５により平行光となったレーザー光１ａを光ディスク５０に対して鉛直に偏向する反射ミラー１０は基台１３の所定の位置に保持されている。 In FIG. 1 to FIG. 3, a light source 1 such as a semiconductor laser is held by a light source holding member 2 and held on a base 13 together with a light source adjustment member 3. The collimating lens 5 that condenses the divergent light of the laser light 1 a emitted from the light source 1 to make it parallel light is adjusted along the optical axis and held on the base 13. The reflection mirror 10 that vertically deflects the laser beam 1 a that has been collimated by the collimator lens 5 with respect to the optical disc 50 is held at a predetermined position on the base 13.

レーザー光１ａを集光して光ディスク５０の盤面上に光スポットを形成する対物レンズ１１と、光ディスク５０によって反射された光の光路を光源１への光路と分離する光学素子２３は、レンズ保持部材３１に保持されている。板状に形成されたコイル手段３２はレンズ保持部材に具備されている。コイル手段３２と対向するように磁石３３がヨークベース３４に配置されている。コイル手段３２は、電流もしくは電圧が印可されて磁石３３とで発生する磁気回路により、レンズ保持部材３１を光ディスク５０の鉛直方向（フォーカス方向、図２および３におけるＦＯＣ方向）や接線方向（トラッキング方向、図２および３におけるＲ方向）に駆動できるよう巻き線されている。コイル手段３２へ給電接続し、かつレンズ保持部材３１を保持するワイヤ５６、ワイヤ保持部材５５とともに、対物レンズ駆動装置１２を構成している。 An objective lens 11 that focuses the laser beam 1a to form a light spot on the surface of the optical disc 50, and an optical element 23 that separates the optical path of the light reflected by the optical disc 50 from the optical path to the light source 1 are a lens holding member. 31. The plate-shaped coil means 32 is provided on the lens holding member. A magnet 33 is disposed on the yoke base 34 so as to face the coil means 32. The coil means 32 is configured to move the lens holding member 31 in the vertical direction (focus direction, FOC direction in FIGS. 2 and 3) or tangential direction (tracking direction) of the optical disk 50 by a magnetic circuit generated by a magnet 33 when current or voltage is applied. 2 and 3 in the R direction). The objective lens driving device 12 is configured together with a wire 56 and a wire holding member 55 that are connected to the coil means 32 by power feeding and hold the lens holding member 31.

光ディスク５０によって反射された光を電気信号に変換する光検出器１４は反射光を最適に検出するよう調整されて基台１３に保持されている。 The photodetector 14 that converts the light reflected by the optical disk 50 into an electric signal is adjusted to optimally detect the reflected light and is held on the base 13.

光源１、対物レンズ駆動装置１２および光検出器１４は図示しないフレキシブルプリント基板などの接続手段によってピックアップ回路基板１５に接続されている。回路基板１５には図示しないレーザー駆動ＩＣなどの電気部品が実装され、かつフレキシブルプリント基板などの信号接続手段１６が接続され、光ピックアップ３０を構成している。 The light source 1, the objective lens driving device 12, and the photodetector 14 are connected to the pickup circuit board 15 by connection means such as a flexible printed board (not shown). An electrical component such as a laser drive IC (not shown) is mounted on the circuit board 15 and signal connection means 16 such as a flexible printed board is connected to constitute an optical pickup 30.

光ディスク５０からの情報信号は、光ピックアップ３０の光検出器１４で電気信号に変換され、信号接続手段１６を経由して信号処理手段である前処理回路３６に入力され、フォーカスエラー信号やトラッキングエラー信号といったサーボ信号の生成ならび再生信号の波形等価、２値化スライス、同期データなどのアナログ信号処理が行われる。前処理回路３６で生成されたサーボ信号は制御手段３７に入力される。制御手段３７はコイル手段３２へ給電して対物レンズ駆動装置１２の駆動を行ったり、光ピックアップ３０を光ディスク５０内周や外周へ移送させる移送モータ４２の駆動を行ったり、光ディスク５０を回転させるスピンドルモータ４３の駆動を行ったりする駆動手段４１を介して光ピックアップ３０の光スポットを光ディスク５０に追従させるため、対物レンズ駆動装置１２のフォーカスおよびトラッキング制御、移送制御、スピンドルモータ制御など一連の制御をデジタルサーボで実現している。また制御手段３７にはコイル手段３２への電流もしくは電圧をモニタする駆動モニタ手段３７ａが具備されている。また前処理回路３６で生成された同期データはシステムコントローラ４０でデジタル信号処理を行い、図示しないインターフェイス回路を介して記録再生データをホストに転送する。 The information signal from the optical disk 50 is converted into an electrical signal by the photodetector 14 of the optical pickup 30 and is input to the preprocessing circuit 36 which is a signal processing means via the signal connecting means 16, and a focus error signal or tracking error Servo signals such as signals are generated, and analog signal processing such as waveform equalization of a reproduction signal, binarized slices, and synchronization data is performed. The servo signal generated by the preprocessing circuit 36 is input to the control means 37. The control unit 37 feeds power to the coil unit 32 to drive the objective lens driving device 12, drives the transfer motor 42 that transports the optical pickup 30 to the inner and outer circumferences of the optical disc 50, and the spindle that rotates the optical disc 50. In order to cause the optical spot of the optical pickup 30 to follow the optical disk 50 via the driving means 41 that drives the motor 43, a series of controls such as focus and tracking control, transfer control, and spindle motor control of the objective lens driving device 12 are performed. Realized with digital servo. The control means 37 is provided with drive monitoring means 37a for monitoring the current or voltage to the coil means 32. The synchronous data generated by the preprocessing circuit 36 is subjected to digital signal processing by the system controller 40, and the recording / reproducing data is transferred to the host via an interface circuit (not shown).

前処理手段３６や制御手段３７やシステムコントローラ４０は、中央演算処理手段３８に接続されており、中央演算処理手段３８の指令により動作する。光ディスク５０を回転し、光ピックアップ３０を目標の位置へ移送し、光ディスク５０の目標のトラックに光スポットを投影、追従させるといった制御動作など、一連の動作は予めファームウエアとして不揮発性メモリ３９に記憶され、接続された中央演算処理手段３８により動作の形態に応じて記憶されたメモリが引き出される。 The preprocessing unit 36, the control unit 37, and the system controller 40 are connected to the central processing unit 38, and operate according to a command from the central processing unit 38. A series of operations such as a control operation of rotating the optical disc 50, transferring the optical pickup 30 to the target position, and projecting and following the light spot on the target track of the optical disc 50 is stored in the nonvolatile memory 39 in advance as firmware. Then, the stored central processing unit 38 extracts the stored memory in accordance with the mode of operation.

ここで制御手段３７により光ディスク５０を回転させ、光ピックアップ３０の駆動を開始すると、図４に示すように、駆動手段４１により対物レンズ駆動装置１２のコイル手段３２に給電される。給電されるとコイル手段３２には抵抗があるため発熱を生じる。この発熱のため、光ピックアップ３０の光学部品には収差変動が発生する。発熱の大きさは、駆動の大きさにより異なり光ディスク５０の面ぶれや偏心といった要因の他に、回転速度によっても変動する。特に対物レンズ１１とコリメートレンズ５と光学素子２３とのうち少なくとも１つは樹脂材料で生成されているとき、図５に示すように、樹脂材料の熱による屈折率変動により、球面収差の変動が大きくなる。その中でも同じレンズ保持部材３１に保持され、発熱源であるコイル手段３２近傍に配置される対物レンズ１１は特に温度上昇の影響を受けやすい。 Here, when the optical disk 50 is rotated by the control unit 37 and driving of the optical pickup 30 is started, power is supplied to the coil unit 32 of the objective lens driving device 12 by the driving unit 41 as shown in FIG. When power is supplied, the coil means 32 has resistance and generates heat. Due to this heat generation, aberration variation occurs in the optical component of the optical pickup 30. The magnitude of the heat generation varies depending on the magnitude of the drive, and varies depending on the rotational speed in addition to factors such as surface wobbling and eccentricity of the optical disc 50. In particular, when at least one of the objective lens 11, the collimating lens 5, and the optical element 23 is made of a resin material, as shown in FIG. 5, the variation in spherical aberration is caused by the refractive index variation due to the heat of the resin material. growing. Among them, the objective lens 11 held by the same lens holding member 31 and disposed in the vicinity of the coil means 32 serving as a heat generation source is particularly susceptible to an increase in temperature.

実施の形態１に係る構成では、駆動モニタ手段３７ａによりモニタされた電流もしくは電圧の大きさによって、駆動開始から所定の時間までの間に所定の回数フォーカス焦点補正を行う動作を不揮発性メモリ３９に記憶させ、光情報記録再生装置６０を構成している。 In the configuration according to the first embodiment, the nonvolatile memory 39 performs an operation of performing focus focus correction a predetermined number of times from the start of driving to a predetermined time depending on the magnitude of the current or voltage monitored by the drive monitoring unit 37a. The optical information recording / reproducing apparatus 60 is stored.

次に実施の形態１に係る光情報記録再生装置の動作を説明する。図１から図８において、高出力の光源１から放射された発散光であるレーザー光１ａは、コリメートレンズ５によって集光される。そして、反射ミラー１０を通り対物レンズ駆動装置１２のレンズ保持部材３１に搭載されたλ／４板が貼り合わされた偏光性ホログラム特性を持つ光学素子２３によって円偏光となる。次に、レンズ保持部材３１に形成された対物レンズ取り付け穴で開口制限され、対物レンズ１１により光ディスク５０の盤面上に集光される。光ディスク５０によって反射された光は対物レンズ１１および光学素子２３を経て往路と直交する直線偏光となり回折分岐される。回折分岐された光は反射ミラー１０、コリメートレンズ５およびビームスプリッタ４を経て光検出器１４に導かれる。そして、光検出器１４によって検出された光量の変化を電気信号に変換し、信号処理手段である前処理回路３６により、フォーカスエラー信号、トラッキングエラー信号といったサーボ信号、ＲＦ信号を得ることができる。得られたサーボ信号から、光スポットを光ディスク５０盤面上の目的の位置、記録または再生するのに最適な位置に投影するよう、制御手段３７によって制御する。光スポットのフォーカス方向及びトラッキング方向の制御は、フォーカスエラー信号、トラッキングエラー信号といったサーボ信号を処理して制御手段３７から駆動手段４１に指令を送り、駆動手段４１から光ピックアップ３０の、対物レンズ駆動装置１２のフォーカスおよびトラッキング方向のコイル手段３２に電流もしくは電圧を印可し、磁石３３により発生する磁気回路によって対物レンズ１１を保持したレンズ保持部材３１をフォーカス方向およびトラッキング方向に動作させることで行うことができる。 Next, the operation of the optical information recording / reproducing apparatus according to Embodiment 1 will be described. In FIG. 1 to FIG. 8, laser light 1 a that is divergent light emitted from a high-power light source 1 is collected by a collimator lens 5. And it becomes circularly polarized light by the optical element 23 having a polarization hologram characteristic to which the λ / 4 plate mounted on the lens holding member 31 of the objective lens driving device 12 passes through the reflection mirror 10. Next, the aperture is limited by the objective lens mounting hole formed in the lens holding member 31, and the light is condensed on the surface of the optical disk 50 by the objective lens 11. The light reflected by the optical disc 50 passes through the objective lens 11 and the optical element 23 to become linearly polarized light orthogonal to the forward path and is diffracted and branched. The diffracted and branched light is guided to the photodetector 14 through the reflecting mirror 10, the collimating lens 5 and the beam splitter 4. Then, the change in the amount of light detected by the photodetector 14 is converted into an electric signal, and a servo signal such as a focus error signal and a tracking error signal, and an RF signal can be obtained by a preprocessing circuit 36 which is a signal processing means. From the obtained servo signal, control is performed by the control means 37 so as to project the light spot onto the target position on the surface of the optical disc 50 and the optimum position for recording or reproduction. The focus direction and tracking direction of the light spot are controlled by processing servo signals such as a focus error signal and tracking error signal and sending a command from the control means 37 to the drive means 41, and driving the objective lens of the optical pickup 30 from the drive means 41. This is performed by applying a current or voltage to the coil means 32 in the focus and tracking direction of the device 12 and operating the lens holding member 31 holding the objective lens 11 in the focus and tracking directions by a magnetic circuit generated by the magnet 33. Can do.

光ディスク５０がスピンドルモータ４３により回転し、光ピックアップ３０の光スポットを光ディスク５０の盤面上に投影して制御、駆動動作をし始めると、コイル手段３２に印可される電流もしくは電圧により、コイル手段３２が発熱、温度上昇して対物レンズ１１、光学素子２３などの光ピックアップ３０の光学部品が温度上昇するが、その大きさは光ディスク５０の面ぶれや偏心、回転数によって異なるため、発熱の大きさも異なる。したがって温度上昇により発生する光ピックアップ３０の光学収差、特に球面収差の変動量も異なる。図６に示すように、球面収差の変動量が大きければ大きいほど、最適なフォーカス点にずれを生じてくる。つまり駆動直後に設定したフォーカス点が時間経過とともに最適点でなくなるため、記録または再生特性に劣化が生じてくる。ここで駆動モニタ手段３７ａによりモニタされた電流もしくは電圧の大きさにより駆動開始から発熱が定常となる所定の時間までの間に所定の回数フォーカス焦点補正を行うことによって、球面収差が変動したときに発生する最適なフォーカス点のずれを補正することができ、安定した制御を行うことができ、記録または再生特性が安定化する。コイル手段３２への電流もしくは電圧が大きい場合は時間経過にともなう球面収差変動も大きいためフォーカス焦点補正の回数を増やし、小さい場合は時間経過にともなう収差変動も小さいため、フォーカス焦点補正の回数を減らすことで、フォーカス焦点補正の最適化を行うことができる。フォーカス焦点補正の方法は、図７に示すように、ジッタ最小となるフォーカス点を複数段階で移動させながら捜す方法、例えばジッタがある値で同等でとなるフォーカス点位置ａと位置ｂとの中心点ｃをジッタ最適とする。または図８に示すように、ＲＦ信号振幅が最大となるフォーカス点を数回のステップで刻みながら捜す方法、例えばＲＦ信号振幅がある値で同等となるフォーカス位置ａａとフォーカス位置ｂｂの中心点ｃｃをＲＦ信号振幅最大とする。またフォーカス焦点補正は、光ディスク５０の光ディスク内周領域５０ａ、外周領域５０ｂの、少なくとも１つの領域で行えば、光ディスク５０の内周部と外周部の基材厚み誤差をも補正することができる。これらのフォーカス焦点補正方法を予め不揮発性メモリ３９に記憶させておくことにより、一連の光情報記録再生装置動作の中で動作し、安定した制御を行うことができる。 When the optical disk 50 is rotated by the spindle motor 43 and the light spot of the optical pickup 30 is projected onto the surface of the optical disk 50 to start the control and driving operation, the coil means 32 is driven by the current or voltage applied to the coil means 32. However, the temperature of the optical components of the optical pickup 30 such as the objective lens 11 and the optical element 23 rises. However, since the magnitude varies depending on the surface blur, eccentricity, and rotation speed of the optical disc 50, the magnitude of the heat generation is also increased. Different. Accordingly, the amount of fluctuation of the optical aberration, particularly the spherical aberration, of the optical pickup 30 caused by the temperature rise is also different. As shown in FIG. 6, the larger the amount of variation in spherical aberration, the more the focus point shifts. That is, since the focus point set immediately after driving becomes not the optimum point with time, the recording or reproduction characteristics deteriorate. Here, when the spherical aberration fluctuates by performing focus focus correction a predetermined number of times from the start of driving to a predetermined time when heat generation becomes steady according to the magnitude of the current or voltage monitored by the drive monitoring means 37a. It is possible to correct the optimum focus point shift that occurs, to perform stable control, and to stabilize the recording or reproduction characteristics. When the current or voltage to the coil means 32 is large, the spherical aberration variation with time is large, so the number of focus focus corrections is increased. When the current or voltage is small, the aberration variation with time is small, so the number of focus focus corrections is reduced. As a result, the focus focus correction can be optimized. As shown in FIG. 7, the focus focus correction method is a method of searching for a focus point that minimizes jitter in a plurality of stages, for example, the center of a focus point position a and a position b where the jitter is equal to a certain value. Let point c be jitter optimum. Alternatively, as shown in FIG. 8, a method of searching for a focus point at which the RF signal amplitude is maximized in steps of several times, for example, a center point cc between the focus position aa and the focus position bb at which the RF signal amplitude is equal to a certain value. Is the maximum RF signal amplitude. In addition, if focus focus correction is performed in at least one of the optical disc inner peripheral region 50a and the outer peripheral region 50b of the optical disc 50, the substrate thickness error between the inner peripheral portion and the outer peripheral portion of the optical disc 50 can also be corrected. By storing these focus focus correction methods in the nonvolatile memory 39 in advance, it is possible to operate in a series of optical information recording / reproducing apparatus operations and perform stable control.

係る構成によれば、従来構成のように温度センサを配置して温度検出を行う必要はなく、駆動モニタ手段３７ａによりモニタされた電流もしくは電圧の大きさにより駆動開始から発熱が定常となる所定の時間までの間に所定の回数フォーカス焦点補正を行うことによって、光ピックアップ３０の温度上昇により発生する球面収差変動による最適なフォーカス点のずれを補正し、最適なフォーカス点の配置設定を行うことができ、簡単な構成で安定した制御、安定した記録再生動作を行うことができる。 According to such a configuration, it is not necessary to perform temperature detection by arranging a temperature sensor as in the conventional configuration, and the predetermined amount of heat generation from the start of driving is constant due to the magnitude of the current or voltage monitored by the drive monitoring unit 37a. By performing the focus focus correction a predetermined number of times before the time, the optimum focus point shift due to the spherical aberration fluctuation caused by the temperature rise of the optical pickup 30 can be corrected, and the optimum focus point arrangement setting can be performed. Therefore, stable control and stable recording / reproducing operation can be performed with a simple configuration.

係る構成によれば、対物レンズ１１とコリメートレンズ５と光学素子２３との少なくとも１つが樹脂材料であっても、温度上昇により発生する球面収差変動による最適なフォーカス点のずれを補正し、最適なフォーカス点の配置設定を行うことができ、簡単な構成で安定した制御、安定した記録再生動作を行うことができる。 According to such a configuration, even when at least one of the objective lens 11, the collimating lens 5, and the optical element 23 is a resin material, the optimum focus point shift due to the spherical aberration variation caused by the temperature rise is corrected, and the optimum Focus point arrangement can be set, and stable control and stable recording / reproducing operation can be performed with a simple configuration.

（実施の形態２）
図９は、実施の形態２における光情報記録再生装置の、光ピックアップの対物レンズ駆動装置にある大きさの電流もしくは電圧を加えたときの時間と発熱の大きさを示すグラフである。構成は実施の形態１とほぼ同じであるので詳細な説明は省略する。実施の形態１と異なる点は駆動手段４１によりコイル手段３２の印可を開始して、駆動モニタ手段３７ａによる電流もしくは電圧が所定の値となり、かつ駆動開始から発熱が定常となる所定の時間までの間に所定の回数フォーカス焦点補正を行うとしたことである（実施の形態２の構成）。 (Embodiment 2)
FIG. 9 is a graph showing the time and magnitude of heat generation when a certain amount of current or voltage is applied to the objective lens driving device of the optical pickup in the optical information recording / reproducing apparatus in the second embodiment. Since the configuration is substantially the same as in the first embodiment, detailed description thereof is omitted. The difference from the first embodiment is that the drive means 41 starts applying the coil means 32, and the current or voltage by the drive monitor means 37a becomes a predetermined value, and from the start of driving until a predetermined time when the heat generation becomes steady. In other words, the focus focus correction is performed a predetermined number of times (configuration of the second embodiment).

実質的に、対物レンズ１１をレンズ保持部材３１に保持しているとき、フォーカスおよびトラッキング直列状態で抵抗１５Ωのコイル手段３２へ、１２０ｍＡの給電によって光ピックアップ３０の対物レンズ駆動装置１２には２０℃の温度上昇があり、発熱が定常となるまで１０分かかり、球面収差は−０．０２λ変動する。球面収差の変動が−０．０２λの場合、最適となるフォーカス点の位置は、初期から０．２μｍのずれを生じる。ここで例えば温度上昇４℃刻みで５回、フォーカス焦点補正を行うと、最適なフォーカス点のずれは０．０４μｍとなり、ジッタ特性の大きな劣化を防ぎ記録または再生動作の安定化を行うことができる。 In effect, when the objective lens 11 is held by the lens holding member 31, the objective lens driving device 12 of the optical pickup 30 is supplied to the objective lens driving device 12 of the optical pickup 30 by 20 ° C. by feeding 120 mA to the coil means 32 having a resistance of 15Ω in the focus and tracking series state. It takes 10 minutes for the heat generation to become steady, and the spherical aberration fluctuates by -0.02λ. When the variation of the spherical aberration is −0.02λ, the optimum focus point position is shifted by 0.2 μm from the initial position. Here, for example, when the focus focus correction is performed five times in increments of 4 ° C., the optimum focus point shift is 0.04 μm, which can prevent the deterioration of jitter characteristics and stabilize the recording or reproducing operation. .

本構成においても、発熱が定常となる時間までの間に、等間隔の時間もしくは等間隔の発熱による光ピックアップ３０の温度上昇の回数に分けて、フォーカス焦点補正を行うことにより、光ピックアップ３０の温度上昇により発生する球面収差変動によるフォーカス点のずれを補正し、これらのフォーカス焦点補正方法を予め不揮発性メモリ３９に記憶させておくことにより、一連の光情報記録再生装置動作の中で動作し、最適なフォーカス点の配置設定を行うことができ、簡単な構成で安定した制御、安定した記録再生動作を行うことができる。 Also in this configuration, by performing the focus focus correction by dividing the number of times of temperature rise of the optical pickup 30 due to equal intervals of time or equal intervals of heat generation until the time when the heat generation becomes steady, the focus of the optical pickup 30 is corrected. The focus point shift due to the spherical aberration fluctuation caused by the temperature rise is corrected, and these focus focus correction methods are stored in the nonvolatile memory 39 in advance, thereby operating in a series of optical information recording / reproducing apparatus operations. Therefore, it is possible to perform optimal focus point arrangement setting, and to perform stable control and stable recording / reproducing operation with a simple configuration.

なお、実施の形態１および実施の形態２において、フォーカス焦点補正が光ディスク５０の内周領域５０aおよび外周領域５０ｂの少なくとも１つの領域で行うとしたが、例えばＤＶＤ−Ｒディスクなどの連続記録が必要なディスクの場合、予め設定した大きさのフォーカス点移動量を駆動開始から所定の時間までの間に所定の回数移動させる構成としてもよい。 In the first and second embodiments, focus focus correction is performed in at least one of the inner peripheral area 50a and the outer peripheral area 50b of the optical disc 50. For example, continuous recording such as a DVD-R disc is necessary. In the case of a simple disc, the focus point moving amount having a preset size may be moved a predetermined number of times from the start of driving to a predetermined time.

また実施の形態１および実施の形態２において、コイル手段１２は板状に形成されレンズ保持部材３１に具備されているとしたが図１０に示すように、レンズ保持部材３１に巻き線された構成でもよい。 In the first and second embodiments, the coil means 12 is formed in a plate shape and provided in the lens holding member 31. However, as shown in FIG. 10, the coil means 12 is wound around the lens holding member 31. But you can.

また図１１に示すようにレンズ保持部材３１に磁石３３を具備し、かつ磁石３３に対向してトラッキングコイル手段３２ａ、フォーカスコイル手段３２ｂが配置される構成としてもよい。 Further, as shown in FIG. 11, the lens holding member 31 may be provided with a magnet 33, and the tracking coil means 32 a and the focus coil means 32 b may be arranged to face the magnet 33.

また実施の形態１および実施の形態２において、記録または再生動作のさらなる安定化のため、光源１の近傍に温度モニタ手段３５をさらに具備することにより、コイル手段３２による光ピックアップ３０の、対物レンズ駆動装置１２の温度上昇に加えて、光源１の局所部分の温度変動に対してフォーカス焦点補正を行う構成としてもよい。 In the first and second embodiments, the temperature monitoring means 35 is further provided in the vicinity of the light source 1 for further stabilization of the recording or reproducing operation, so that the objective lens of the optical pickup 30 by the coil means 32 is provided. In addition to the temperature rise of the driving device 12, the focus focus correction may be performed with respect to the temperature variation of the local portion of the light source 1.

さらに上記実施例は基本的な構成であり、本発明の権利の範囲において細部の変更を加え、また従来公知の技術に加えて実施することができるものである。 Further, the above-described embodiment is a basic configuration, and can be implemented in addition to a conventionally known technique by changing details within the scope of the right of the present invention.

以上のように、本発明にかかる光情報記録再生装置は、ＤＶＤ等の、複数種類の高記録密度の光情報記録媒体を記録または再生する装置として有用であり、特に対物レンズ駆動装置の発熱による温度上昇で発生する光学収差変動の大きい光ピックアップを制御して、記録または再生するのに適している。 As described above, the optical information recording / reproducing apparatus according to the present invention is useful as an apparatus for recording or reproducing a plurality of types of optical information recording media having a high recording density, such as a DVD. It is suitable for recording or reproducing by controlling an optical pickup having a large optical aberration variation caused by a temperature rise.

本発明の実施の形態１における光情報記録再生装置の構成を示す模式図1 is a schematic diagram showing the configuration of an optical information recording / reproducing apparatus according to Embodiment 1 of the present invention. 同実施の形態１における光情報記録装置の光ピックアップの斜視図The perspective view of the optical pick-up of the optical information recording device in Embodiment 1 同実施の形態１における光情報記録装置の光ピックアップの分解図Exploded view of the optical pickup of the optical information recording apparatus in the first embodiment 同実施の形態１における光情報記録再生装置の光ピックアップの、対物レンズ駆動装置の駆動電流と温度上昇の関係を示すグラフThe graph which shows the relationship between the drive current of an objective lens drive device, and a temperature rise of the optical pickup of the optical information recording / reproducing apparatus in the first embodiment 同実施の形態１における光情報記録再生装置の光ピックアップの、温度と光学部品（球面収差）の収差の関係を示すグラフThe graph which shows the relationship between the temperature of the optical pick-up of the optical information recording / reproducing apparatus in Embodiment 1, and the aberration of an optical component (spherical aberration) 同実施の形態１における光学収差によるフォーカス点とジッタの関係を示すグラフThe graph which shows the relationship between the focus point and jitter by the optical aberration in Embodiment 1 同実施の形態１における光情報記録再生装置のジッタによるフォーカス焦点補正方法の一例を示すグラフ6 is a graph showing an example of a focus focus correction method using jitter in the optical information recording / reproducing apparatus according to the first embodiment. 同実施の形態１における光情報記録再生装置のＲＦ信号によるフォーカス焦点補正方法の一例を示すグラフThe graph which shows an example of the focus focus correction method by RF signal of the optical information recording / reproducing apparatus in Embodiment 1 同実施の形態２における光情報記録再生装置の、光ピックアップの対物レンズ駆動装置にある大きさの電流もしくは電圧を加えたときの時間と発熱の大きさを示すグラフThe graph which shows the time and the magnitude | size of heat_generation | fever when a certain amount of electric current or voltage is added to the objective lens drive device of an optical pick-up of the optical information recording / reproducing apparatus in the second embodiment. 同実施の形態１および実施の形態２におけるレンズ保持部材へのコイル手段巻き線構成図Coil means winding configuration diagram to lens holding member in the first embodiment and the second embodiment 同実施の形態１および実施の形態２におけるレンズ保持部材への磁石取り付け構成を示す分解図The exploded view which shows the magnet attachment structure to the lens holding member in the Embodiment 1 and Embodiment 2 従来の光情報記録再生装置の構成を示す概略模式図Schematic schematic diagram showing the configuration of a conventional optical information recording / reproducing apparatus 従来の他の光情報記録再生装置の構成を示す概略模式図Schematic schematic diagram showing the configuration of another conventional optical information recording / reproducing apparatus

Explanation of symbols

１光源
１ａレーザー光
５コリメートレンズ
１０反射ミラー
１１対物レンズ
１２対物レンズ駆動装置
１３基台
１４光検出器
１５ピックアップ回路基板
１６信号接続手段
３０光ピックアップ
３１レンズ保持部材
３２コイル手段
３３磁石
３５温度モニタ手段
３６前処理回路
３７制御手段
３７ａ駆動モニタ手段
３８中央演算処理手段
３９不揮発性メモリ
４０システムコントローラ
４１駆動手段
５０光ディスク
５０ａ光ディスク内周領域
５０ｂ光ディスク外周領域
６０光情報記録再生装置 DESCRIPTION OF SYMBOLS 1 Light source 1a Laser beam 5 Collimating lens 10 Reflection mirror 11 Objective lens 12 Objective lens drive device 13 Base 14 Photo detector 15 Pickup circuit board 16 Signal connection means 30 Optical pickup 31 Lens holding member 32 Coil means 33 Magnet 35 Temperature monitoring means 36 Pre-processing circuit 37 Control means 37a Drive monitoring means 38 Central processing means 39 Non-volatile memory 40 System controller 41 Drive means 50 Optical disk 50a Optical disk inner peripheral area 50b Optical disk outer peripheral area 60 Optical information recording / reproducing apparatus

Claims

The optical pickup includes a light source that emits laser light, a collimator lens that converts the laser light emitted from the light source into parallel light, and condensing the laser light converted into parallel light by the collimator lens. An objective lens that projects a light spot onto an information recording medium and focuses the light, an optical element that separates an optical path of light reflected from the optical information recording medium from an optical path to the light source, and light separated by the optical element It is composed of a photodetector that receives light and converts it into an electrical signal, a lens holding member that holds the objective lens and the optical element, coil means, and a magnet that is disposed to face the coil means.
A driving circuit that drives the lens holding member in a focusing and tracking direction by a magnetic circuit generated by the magnet by applying a current or voltage to the optical pickup and the coil means, and monitoring a current or voltage by the driving means. Drive monitoring means, a signal processing means for converting an electrical signal from the optical pickup into a servo signal of a focus error signal and a tracking error signal, and a light spot following the optical information recording medium by the servo signal from the signal processing means An optical information recording / reproducing apparatus configured with control means for controlling the driving means to
An optical information recording / reproducing apparatus, wherein focus focus correction is performed a predetermined number of times from the start of driving to a predetermined time according to the magnitude of the current or voltage monitored by the drive monitoring means.

The optical pickup includes a light source that emits laser light, a collimator lens that converts the laser light emitted from the light source into parallel light, and condensing the laser light converted into parallel light by the collimator lens. An objective lens that projects a light spot onto an information recording medium and focuses the light, an optical element that separates an optical path of light reflected from the optical information recording medium from an optical path to the light source, and light separated by the optical element It is composed of a photodetector that receives light and converts it into an electrical signal, a lens holding member that holds the objective lens and the optical element, coil means, and a magnet that is disposed to face the coil means.
A driving circuit that drives the lens holding member in a focusing and tracking direction by a magnetic circuit generated by the magnet by applying a current or voltage to the optical pickup and the coil means, and monitoring a current or voltage by the driving means. Drive monitoring means, a signal processing means for converting an electrical signal from the optical pickup into a servo signal of a focus error signal and a tracking error signal, and a light spot following the optical information recording medium by the servo signal from the signal processing means An optical information recording / reproducing apparatus configured with control means for controlling the driving means to
The application of the coil means is started by the drive means, the current or voltage by the drive monitor means becomes a predetermined value, and focus focus correction is performed a predetermined number of times from the start of driving to a predetermined time. An optical information recording / reproducing apparatus.

The optical information recording / reproducing apparatus according to claim 1, wherein at least one of the objective lens, the collimating lens, and the optical element of the optical pickup is made of a resin material.

The optical information recording / reproducing apparatus according to claim 1, wherein the optical pickup is further provided with temperature monitoring means for monitoring a temperature of the optical pickup.

In the optical information recording medium, an address area in which address information is recorded and a data area in which the information is recorded are arranged, and the focus focus correction performs jitter when reproducing the information from the data area. The optical information recording / reproducing apparatus according to claim 1, wherein the focus point is moved so that the RF signal becomes optimal or the RF signal is maximized.

6. The optical information recording / reproducing apparatus according to claim 5, wherein the optical information recording medium has a disk shape, and the focus focus correction is performed in at least one of an inner peripheral area and an outer peripheral area of the optical information recording medium.

3. The optical information recording / reproducing apparatus according to claim 1, wherein the focus focus correction moves a focus point movement amount having a preset size a predetermined number of times from the start of driving to a predetermined time.

The coil means of the optical pickup is wound around the lens holding member or formed in a plate shape and is provided in the lens holding member, and the magnet is disposed opposite to the coil means. Item 3. The optical information recording / reproducing apparatus according to Item 1 or 2.

3. The optical information recording / reproducing apparatus according to claim 1, wherein the magnet of the optical pickup is provided in the lens holding member, and the coil means is disposed to face the magnet.