JP2003151162A5 - - Google Patents
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【発明の名称】光検出器、光学ヘッドおよび光学的情報再生装置[Title of the Invention Photodetectors, optical head and optical histological information reproducing apparatus
【０００８】
【課題を解決するための手段】
以上の課題を解決するために本発明では、半導体レーザ光源から発射され少なくとも０次光、＋１次光、−１次光の３つに分岐された光ビームが光学的情報記録媒体で反射された３つの光ビームを受光する光検出器であって、
前記０次光、＋１次光、−１次光の反射光の各々を受光する第１、第２、第３の領域を有し、該第２及び第３の領域は、それぞれ、少なくとも ２ 本の分割線により４分割された４つの受光面を有し、前記第２、第３の領域の各々の４つの受光面のうち、前記分割線の交点から同じ向きに位置する前記第２の領域の受光面と前記第３の領域の受光面の出力の和信号を該光検出器の外部に出力し、前記和信号と、前記第１の領域から出力される信号は、外部でのサーボ信号の検出において、前記第１の領域から出力される信号と前記和信号の両方を用いる場合と、前記第１の領域から出力される信号を用い、かつ前記和信号を用いない場合とが選択される信号である光検出器を提供する。 [0008]
[Means for Solving the Problems]
In order to solve the above problems, in the present invention, a light beam emitted from a semiconductor laser light source and branched into at least 0th order light, + 1st order light, and -1st order light is reflected by an optical information recording medium A photodetector for receiving three light beams;
The 0-order light, + 1-order light, first for receiving the respective reflected light -1 order light, second, a third region, said second and third regions, respectively, at least two And the second region of the four light receiving surfaces of each of the second and third regions positioned in the same direction from the intersection of the dividing lines. The sum signal of the output of the light receiving surface of the third region and the light receiving surface of the third region is output to the outside of the light detector, and the sum signal and the signal output from the first region are servo signals in the outside In the detection of the case where both the signal output from the first area and the sum signal are used, and the case where the signal output from the first area is used and the sum signal is not used are selected. Provide a photodetector that is a signal.
【０００９】
または、前記第２、第３の領域の各々の４つの受光面のうち、前記分割線の交点から同じ向きに位置する前記第２の領域の受光面と前記第３の領域の受光面の出力線を該光検出器内部で結線して外部に出力し、前記結線された出力線と、前記第１の領域から出力される出力線は、外部でのサーボ信号の検出において、前記第１の領域から出力される出力線と前記結線された出力線の両方を用いる場合と、前記第１の領域から出力される出力線を用い、かつ前記結線された出力線を用いない場合とが選択される出力線である光検出器を提供する。
または、前記第２、第３の領域の各々の４つの受光面のうち、前記分割線の交点から同じ向きに位置する前記第２の領域の受光面と前記第３の領域の受光面の出力の和信号を該光検出器の外部に出力し、前記和信号は、外部において、非点収差方式による焦点ずれ信号及び差動プッシュプル方式によるトラッキング誤差信号の検出に用いられる信号である光検出器を提供する。
または、前記第２、第３の領域の各々の４つの受光面のうち、前記分割線の交点から同じ向きに位置する前記第２の領域の受光面と前記第３の領域の受光面の出力の和信号を該光検出器の外部に出力し、前記和信号は、外部において、焦点ずれ信号及びトラッキング誤差信号の両方の検出に用いる場合と、前記焦点ずれ信号とトラッキング誤差信号のいずれか一方の検出に用いる場合とが選択される信号である光検出器を提供する。
さらに、上記光検出器において、前記和信号の信号電流を信号電圧に変換する電流 − 電圧変換増幅器をさらに有する光検出器を提供する。 [0009]
Alternatively, among the four light receiving surfaces of each of the second and third regions, the output of the light receiving surface of the second region and the light receiving surface of the third region positioned in the same direction from the intersection of the dividing lines A wire is internally connected within the light detector and is output to the outside, and the connected output line and an output line output from the first region are the first one in the detection of the servo signal externally. A case is selected in which both the output line output from the area and the output line connected are used, and the output line output from the first area is used and the output line connected is not used. Provide an optical detector that is an output line.
Alternatively, among the four light receiving surfaces of each of the second and third regions, the output of the light receiving surface of the second region and the light receiving surface of the third region positioned in the same direction from the intersection of the dividing lines The sum signal is output to the outside of the light detector, and the sum signal is a signal used for detecting an out-of-focus signal by an astigmatism method and a tracking error signal by a differential push-pull method outside Provide the
Alternatively, among the four light receiving surfaces of each of the second and third regions, the output of the light receiving surface of the second region and the light receiving surface of the third region positioned in the same direction from the intersection of the dividing lines The sum signal is output to the outside of the light detector, and the sum signal is used for detecting both the out-of-focus signal and the tracking error signal outside, either the out-of-focus signal or the tracking error signal. The present invention provides a light detector which is a signal to be selected for use in detection of
Further, the present invention provides the photodetector further including a current - voltage conversion amplifier for converting the signal current of the sum signal into a signal voltage .
【００１０】
また、本発明では、上記光検出器を有した光学ヘッドを提供する。例えば、光ビームを発射する半導体レーザ光源と、該半導体レーザ光源から発射された光ビームを少なくとも０次光、＋１次光、−１次光の３つの光ビームに分離する光分岐素子と、該３つの光ビームを集光して光学的情報記録媒体上に光スポットを照射する対物レンズと、前記光学的情報記録媒体を反射した前記光ビームを受光して外部に信号を出力する光検出器と、を有し、前記光検出器は、前記０次光、＋１次光、−１次光の反射光の各々を受光する第１、第２、第３の領域を有し、該第２及び第３の領域は、それぞれ、少なくとも ２ 本の分割線により４分割された４つの受光面を有し、前記第２、第３の領域の各々の４つの受光面のうち、前記分割線の交点から同じ向きに位置する前記第２の領域の受光面と前記第３の領域の受光面の出力の和信号を該光検出器の外部に出力し、前記和信号と、前記第１の領域から出力される信号は、外部でのサーボ信号の検出において、前記第１の領域から出力される信号と前記和信号の両方を用いる場合と、前記第１の領域から出力される信号を用い、かつ前記和信号を用いない場合とが選択される信号である構成とする。 [0010]
Further, the present invention provides an optical head having the above-mentioned light detector. For example, a semiconductor laser light source emitting a light beam, a light branching element separating the light beam emitted from the semiconductor laser light source into three light beams of at least 0th order light, + 1st order light and -1st order light; An objective lens which condenses three light beams and illuminates a light spot on an optical information recording medium, and a light detector which receives the light beam reflected from the optical information recording medium and outputs a signal to the outside And the light detector has first, second, and third regions for receiving each of the reflected light of the zeroth-order light, the + 1st-order light, and the -1st-order light, and the second And the third region each have four light receiving surfaces divided into four by at least two dividing lines, and of the four light receiving surfaces of each of the second and third regions, The light receiving surface of the second area and the light receiving surface of the third area located in the same direction from the intersection point The sum signal of the output is outputted to the outside of the light detector, and the sum signal and the signal outputted from the first area are outputted from the first area in the detection of the servo signal outside. A configuration is adopted in which both the case where the signal and the sum signal are used and the case where the signal output from the first region is used and the case where the sum signal is not used are selected.
【００１１】
さらに、本発明における光学的情報再生装置は、少なくとも０次光、＋１次光、−１次光の３つに分岐された光ビームを、光学的情報記録媒体に照射する対物レンズと、前記０次光、＋１次光、−１次光が前記光学的情報記録媒体で反射した反射光の各々を受光する第１、第２、第３の領域を有し、該第２及び第３の領域が、それぞれ、少なくとも ２ 本の分割線により４分割された４つの受光面を有し、前記第２、第３の領域の各々の４つの受光面のうち、前記分割線の交点から同じ向きに位置する前記第２の領域の受光面と前記第３の領域の受光面の出力の和信号を外部に出力する光検出器と、前記光検出器から得られた信号に基づいて、前記対物レンズの位置制御を行うためのサーボ信号を生成するサーボ信号生成回路と、前記光検出器から得られる信号に基づいて前記光学的情報記録媒体の種類を判別するコントロール回路と、を有し、前記コントロール回路は、前記光学的情報記録媒体の種類の判別結果に基づいて、前記第１の領域から出力される信号と前記和信号の両方を用いてサーボ信号を生成する場合と、前記第１の領域から出力される信号を用い、かつ前記和信号を用いないでサーボ信号を生成する場合とを選択するように、前記サーボ信号生成回路を制御する構成とする。例えば、前記コントロール回路は、前記判別結果が ＤＶＤ−ＲＡＭ ディスクであるときは、前記第１の領域から出力される信号と前記和信号の両方を用いてサーボ信号を生成し、前記判別結果が ＤＶＤ−ＲＯＭ ディスクであるときは、前記第１の領域から出力される信号を用い、かつ前記和信号を用いないでサーボ信号を生成するように、前記サーボ信号生成回路を制御する。 [0011]
Furthermore, an optical information reproducing apparatus according to the present invention comprises an objective lens for irradiating an optical information recording medium with a light beam branched into at least 0th order light, + 1st order light, and -1st order light; The second and third regions have first, second and third regions in which the next light, + 1st light and -1st light receive each of the reflected light reflected by the optical information recording medium, the second and third regions Each having four light receiving surfaces divided into four by at least two dividing lines, and of the four light receiving surfaces of each of the second and third regions, from the intersection of the dividing lines in the same direction A photodetector for outputting a sum signal of outputs of the light receiving surface of the second region and the light receiving surface of the third region to the outside; and the objective lens based on the signal obtained from the light detector Servo signal generation circuit for generating a servo signal for performing position control of And a control circuit for determining the type of the optical information recording medium based on a signal obtained by the control circuit, the control circuit controlling the first circuit based on the determination result of the type of the optical information recording medium. In the case of generating a servo signal using both the signal output from an area and the sum signal, and in the case of generating a servo signal using the signal output from the first area and not using the sum signal The servo signal generation circuit is controlled to select the above. For example, when the determination result is a DVD-RAM disc, the control circuit generates a servo signal using both the signal output from the first area and the sum signal, and the determination result is a DVD When it is a ROM disk, the servo signal generation circuit is controlled to generate a servo signal using the signal output from the first area and not using the sum signal.
【００１２】
または、光ビームを発射する半導体レーザ光源と、前記半導体レーザ光源から発射された光ビームを少なくとも０次光、＋１次光、−１次光の３つの光ビームに分離する光分岐素子と、前記３つの光ビームを集光して光学的情報記録媒体上に光スポットを照射する対物レンズと、前記０次光、＋１次光、−１次光が前記光学的情報記録媒体で反射した反射光の各々を受光する第１、第２、第３の領域を有し、該第２及び第３の領域が、それぞれ、少なくとも ２ 本の分割線により４分割された４つの受光面を有し、前記第２、第３の領域の各々の４つの受光面のうち、前記分割線の交点から同じ向きに位置する前記第２の領域の受光面と前記第３の領域の受光面の出力線を該光検出器内部で結線して外部に出力する光検出器と、を有する光学ヘッドと、前記光検出器から得られた信号に基づいて、前記対物レンズの位置制御を行うためのサーボ信号を生成するサーボ信号生成回路と、前記光検出器から得られる信号に基づいて前記光学的情報記録媒体の種類を判別するコントロール回路と、を有し、前記コントロール回路は、前記光学的情報記録媒体の種類の判別結果に基づいて、前記第１の領域から出力される出力線と前記結線された出力線の両方を用いてサーボ信号を生成する場合と、前記第１の領域から出力される出力線を用い、かつ前記結線された出力線を用いないでサーボ信号を生成する場合とを選択するように、前記サーボ信号生成回路を制御する構成とする。 [0012]
Alternatively, a semiconductor laser light source for emitting a light beam, a light branching element for separating a light beam emitted from the semiconductor laser light source into three light beams of at least 0th order light, + 1st order light and -1st order light, An objective lens which condenses three light beams and illuminates a light spot on an optical information recording medium, and reflected light in which the 0th order light, + 1st order light and -1st order light are reflected by the optical information recording medium , And each of the second and third regions has four light receiving surfaces divided into four by at least two dividing lines, Among the four light receiving surfaces of each of the second and third regions, the output lines of the light receiving surface of the second region and the light receiving surface of the third region located in the same direction from the intersection of the dividing lines An optical detector having a photodetector internally connected to the photodetector and outputting the same externally; And a servo signal generation circuit for generating a servo signal for performing position control of the objective lens based on a signal obtained from the light detector; and the optical based on a signal obtained from the light detector. A control circuit for determining the type of the target information recording medium, the control circuit, based on the result of determination of the type of the optical information recording medium, an output line output from the first area and the output line The servo signal is generated using both of the wired output lines, and the servo signal is generated using the output line output from the first region and not using the wired output line. The servo signal generation circuit is controlled so as to select
【００１３】
または、前記光検出器から得られた前記和信号に基づいて、非点収差方式による焦点ずれ信号及び差動プッシュプル方式によるトラッキング誤差信号を生成するサーボ信号生成回路と、前記和信号に基づき前記サーボ信号生成回路で生成された焦点ずれ信号及びトラッキング誤差信号を用いて、前記対物レンズの位置制御を行うアクチュエータ駆動回路と、を有する構成とする。 [0013]
Alternatively, based on the sum signal, a servo signal generation circuit that generates an out-of-focus signal by an astigmatic method and a tracking error signal by a differential push-pull method based on the sum signal obtained from the light detector And an actuator drive circuit for controlling the position of the objective lens using the focus error signal and the tracking error signal generated by the servo signal generation circuit.
【００１４】
または、前記光検出器から得られた信号に基づいて、前記対物レンズの位置制御を行うための焦点ずれ信号及びトラッキング差信号とを生成するサーボ信号生成回路と、前記光検出器から得られる信号に基づいて前記光学的情報記録媒体の種類を判別するコントロール回路と、を有し、前記コントロール回路は、前記光学的情報記録媒体の種類の判別結果に基づいて、前記和信号を用いて焦点ずれ信号及びトラッキング誤差信号の両方を生成する場合と、前記和信号を用いて焦点ずれ信号とトラッキング誤差信号のいずれか一方を生成する場合とを選択するように、前記サーボ信号生成回路を制御する構成とする。例えば、前記コントロール回路は、前記判別結果が ＤＶＤ−ＲＡＭ 又は ＤＶＤ−ＲＯＭ であるときは、前記和信号を用いて焦点ずれ信号及びトラッキング誤差信号の両方を生成し、前記判別結果が ＣＤ 又は ＣＤ−ＲＯＭ 又は ＣＤ−Ｒ であるときは、前記和信号を用いてトラッキング誤差信号のみを生成するように、前記サーボ信号生成回路を制御する。 [0014]
Alternatively, based on a signal obtained from the light detector, a servo signal generation circuit that generates a focus shift signal and a tracking difference signal for performing position control of the objective lens, and a signal obtained from the light detector And a control circuit for determining the type of the optical information recording medium based on the control signal, the control circuit using the sum signal based on the determination result of the type of the optical information recording medium. The servo signal generation circuit is controlled to select the case of generating both the signal and the tracking error signal and the case of generating either the defocus signal or the tracking error signal using the sum signal. I assume. For example, when the determination result is a DVD-RAM or DVD-ROM , the control circuit generates both the defocus signal and the tracking error signal using the sum signal, and the determination result is CD or CD- When it is ROM or CD-R , the servo signal generation circuit is controlled to generate only a tracking error signal using the sum signal.
【００１５】
さらに、本発明では、上記の光学ヘッドと、前記光検出器から得られた信号に基づいて、前記対物レンズの位置制御を行うためのサーボ信号を生成するサーボ信号生成回路と、前記光検出器から得られる信号に基づいて前記光学的情報記録媒体の種類を判別し、該判別結果に基づいて、前記サーボ信号生成回路におけるサーボ信号検出方式を選択するコントロール回路と、を有する光学的情報再生装置を提供する。 [0015]
Furthermore, in the present invention, a servo signal generation circuit that generates a servo signal for performing position control of the objective lens based on the above optical head, the signal obtained from the light detector, and the light detector An optical information reproducing apparatus comprising: a control circuit that determines the type of the optical information recording medium based on a signal obtained from the control unit and selects a servo signal detection method in the servo signal generation circuit based on the determination result; I will provide a.
【００５１】
【発明の効果】
以上述べたように本発明によれば，外乱を大幅に低減した良好な焦点ずれ信号や対物レンズ変位に伴うオフセットを大幅に低減した良好なトラッキング誤差信号が得られる上，部品点数の少ない簡略な構成の光学ヘッドを用いてＤＶＤ−ＲＡＭ，ＤＶＤ−ＲＯＭディスクなどの高密度ディスクを始め，ＣＤ，ＣＤ−ＲＯＭ，ＣＤ−Ｒなど既存の光ディスクの再生にも対応した汎用性の高い光学的情報再生装置を実現することができる。[0051]
【Effect of the invention】
As described above, according to the present invention, it is possible to obtain a good out-of-focus signal with significantly reduced disturbance and a good tracking error signal with significantly reduced offset due to the displacement of the objective lens. DVD-RAM using an optical head configuration, including the high-density disk such as DVD-ROM discs, CD, CD-ROM, the corresponding versatile light histological information to the reproduction of existing optical discs such as CD-R A playback device can be realized.
Claims (14)
前記０次光、＋１次光、−１次光の反射光の各々を受光する第１、第２、第３の領域を有し、
該第２及び第３の領域は、それぞれ、少なくとも２本の分割線により４分割された４つの受光面を有し、
前記第２、第３の領域の各々の４つの受光面のうち、前記分割線の交点から同じ向きに位置する前記第２の領域の受光面と前記第３の領域の受光面の出力の和信号を該光検出器の外部に出力し、
前記和信号と、前記第１の領域から出力される信号は、外部でのサーボ信号の検出において、前記第１の領域から出力される信号と前記和信号の両方を用いる場合と、前記第１の領域から出力される信号を用い、かつ前記和信号を用いない場合とが選択される信号であることを特徴とする光検出器。A light detector which receives three light beams emitted from a semiconductor laser light source and branched into at least zero-order light, + 1st-order light and -1st-order light and reflected by an optical information recording medium ,
It has first, second and third regions for receiving each of the reflected light of the 0th order light, + 1st order light and -1st order light,
The second and third regions each have four light receiving surfaces divided into four by at least two dividing lines,
The sum of the outputs of the light receiving surface of the second region and the light receiving surface of the third region located in the same direction from the intersection point of the dividing lines among the four light receiving surfaces of each of the second and third regions Output a signal to the outside of the light detector,
When the sum signal and the signal output from the first area use both the signal output from the first area and the sum signal in the detection of the servo signal outside, and the first A signal that is selected from the case where the signal output from the region is not used and the case where the sum signal is not used is selected.
前記０次光、＋１次光、−１次光の反射光の各々を受光する第１、第２、第３の領域を有し、
該第２及び第３の領域は、それぞれ、少なくとも２本の分割線により４分割された４つの受光面を有し、
前記第２、第３の領域の各々の４つの受光面のうち、前記分割線の交点から同じ向きに位置する前記第２の領域の受光面と前記第３の領域の受光面の出力線を該光検出器内部で結線して外部に出力し、
前記結線された出力線と、前記第１の領域から出力される出力線は、外部でのサーボ信号の検出において、前記第１の領域から出力される出力線と前記結線された出力線の両方を用いる場合と、前記第１の領域から出力される出力線を用い、かつ前記結線された出力線を用いない場合とが選択される出力線であることを特徴とする光検出器。A light detector which receives three light beams emitted from a semiconductor laser light source and branched into at least zero-order light, + 1st-order light and -1st-order light and reflected by an optical information recording medium ,
It has first, second and third regions for receiving each of the reflected light of the 0th order light, + 1st order light and -1st order light,
The second and third regions each have four light receiving surfaces divided into four by at least two dividing lines,
Among the four light receiving surfaces of each of the second and third regions, the output lines of the light receiving surface of the second region and the light receiving surface of the third region located in the same direction from the intersection of the dividing lines Wired inside the light detector and output it,
The wired output line and the output line outputted from the first area are both an output line outputted from the first area and the wired output line in detection of a servo signal externally. And a case where the output line output from the first region is used and the case where the connected output line is not used is an output line to be selected.
前記０次光、＋１次光、−１次光の反射光の各々を受光する第１、第２、第３の領域を有し、
該第２及び第３の領域は、それぞれ、少なくとも２本の分割線により４分割された４つの受光面を有し、
前記第２、第３の領域の各々の４つの受光面のうち、前記分割線の交点から同じ向きに位置する前記第２の領域の受光面と前記第３の領域の受光面の出力の和信号を該光検出器の外部に出力し、前記和信号は、外部において、非点収差方式による焦点ずれ信号及び差動プッシュプル方式によるトラッキング誤差信号の検出に用いられる信号であることを特徴とする光検出器。A light detector which receives three light beams emitted from a semiconductor laser light source and branched into at least zero-order light, + 1st-order light and -1st-order light and reflected by an optical information recording medium ,
It has first, second and third regions for receiving each of the reflected light of the 0th order light, + 1st order light and -1st order light,
The second and third regions each have four light receiving surfaces divided into four by at least two dividing lines,
The sum of the outputs of the light receiving surface of the second region and the light receiving surface of the third region located in the same direction from the intersection point of the dividing lines among the four light receiving surfaces of each of the second and third regions A signal is output to the outside of the light detector, and the sum signal is a signal used for detection of an out-of-focus signal by an astigmatism method and a tracking error signal by a differential push-pull method. Light detector.
前記０次光、＋１次光、−１次光の反射光の各々を受光する第１、第２、第３の領域を有し、
該第２及び第３の領域は、それぞれ、少なくとも２本の分割線により４分割された４つの受光面を有し、
前記第２、第３の領域の各々の４つの受光面のうち、前記分割線の交点から同じ向きに位置する前記第２の領域の受光面と前記第３の領域の受光面の出力の和信号を該光検出器の外部に出力し、前記和信号は、外部において、焦点ずれ信号及びトラッキング誤差信号の両方の検出に用いる場合と、前記焦点ずれ信号とトラッキング誤差信号のいずれか一方の検出に用いる場合とが選択される信号であることを特徴とする光検出器。A light detector which receives three light beams emitted from a semiconductor laser light source and branched into at least zero-order light, + 1st-order light and -1st-order light and reflected by an optical information recording medium ,
It has first, second and third regions for receiving each of the reflected light of the 0th order light, + 1st order light and -1st order light,
The second and third regions each have four light receiving surfaces divided into four by at least two dividing lines,
The sum of the outputs of the light receiving surface of the second region and the light receiving surface of the third region located in the same direction from the intersection point of the dividing lines among the four light receiving surfaces of each of the second and third regions When the signal is output to the outside of the light detector, and the sum signal is used for detecting both the out-of-focus signal and the tracking error signal outside, the detection of either the out-of-focus signal or the tracking error signal And a case where it is used for is a signal to be selected.
該半導体レーザ光源から発射された光ビームを少なくとも０次光、＋１次光、−１次光の３つの光ビームに分離する光分岐素子と、
該３つの光ビームを集光して光学的情報記録媒体上に光スポットを照射する対物レンズと、
前記光学的情報記録媒体を反射した前記光ビームを受光して外部に信号を出力する光検出器と、を有し、
前記光検出器は、前記０次光、＋１次光、−１次光の反射光の各々を受光する第１、第２、第３の領域を有し、該第２及び第３の領域は、それぞれ、少なくとも２本の分割線により４分割された４つの受光面を有し、前記第２、第３の領域の各々の４つの受光面のうち、前記分割線の交点から同じ向きに位置する前記第２の領域の受光面と前記第３の領域の受光面の出力の和信号を該光検出器の外部に出力し、前記和信号と、前記第１の領域から出力される信号は、外部でのサーボ信号の検出において、前記第１の領域から出力される信号と前記和信号の両方を用いる場合と、前記第１の領域から出力される信号を用い、かつ前記和信号を用いない場合とが選択される信号であることを特徴とする光学ヘッド。A semiconductor laser light source for emitting a light beam;
A light branching element for separating a light beam emitted from the semiconductor laser light source into three light beams of at least 0th order light, + 1st order light and -1st order light;
An objective lens which condenses the three light beams and irradiates a light spot on an optical information recording medium;
A photodetector for receiving the light beam reflected from the optical information recording medium and outputting a signal to the outside;
The light detector has first, second and third regions for receiving each of the reflected light of the 0th order light, + 1st order light and -1st order light, and the second and third areas are And four light receiving surfaces divided into four by at least two dividing lines, and among the four light receiving surfaces of each of the second and third regions, positions from the intersection of the dividing lines in the same direction The sum signal of the output of the light receiving surface of the second area and the light receiving surface of the third area is output to the outside of the light detector, and the sum signal and the signal output from the first area are In the case of using both the signal output from the first area and the sum signal in external detection of a servo signal, using the signal output from the first area and using the sum signal An optical head characterized in that the signal not selected is a signal to be selected.
該半導体レーザ光源から発射された光ビームを少なくとも０次光、＋１次光、−１次光の３つの光ビームに分離する光分岐素子と、
該３つの光ビームを集光して光学的情報記録媒体上に光スポットを照射する対物レンズと、
請求項２乃至５のいずれか一つに記載の光検出器と、
を有することを特徴とする光学ヘッド。A semiconductor laser light source for emitting a light beam;
A light branching element for separating a light beam emitted from the semiconductor laser light source into three light beams of at least 0th order light, + 1st order light and -1st order light;
An objective lens which condenses the three light beams and irradiates a light spot on an optical information recording medium;
A photodetector according to any one of claims 2 to 5;
An optical head characterized by having.
前記０次光、＋１次光、−１次光が前記光学的情報記録媒体で反射した反射光の各々を受光する第１、第２、第３の領域を有し、該第２及び第３の領域が、それぞれ、少なくとも２本の分割線により４分割された４つの受光面を有し、前記第２、第３の領域の各々の４つの受光面のうち、前記分割線の交点から同じ向きに位置する前記第２の領域の受光面と前記第３の領域の受光面の出力の和信号を外部に出力する光検出器と、
前記光検出器から得られた信号に基づいて、前記対物レンズの位置制御を行うためのサーボ信号を生成するサーボ信号生成回路と、
前記光検出器から得られる信号に基づいて前記光学的情報記録媒体の種類を判別するコントロール回路と、を有し、
前記コントロール回路は、前記光学的情報記録媒体の種類の判別結果に基づいて、前記第１の領域から出力される信号と前記和信号の両方を用いてサーボ信号を生成する場合と、前記第１の領域から出力される信号を用い、かつ前記和信号を用いないでサーボ信号を生成する場合とを選択するように、前記サーボ信号生成回路を制御することを特徴とする光学的情報再生装置。An objective lens for irradiating an optical information recording medium with a light beam branched into at least zero-order light, + 1st-order light, and -1st-order light;
The second and third regions have first, second and third regions in which the zeroth-order light, the + 1st-order light and the -1st-order light receive each of the reflected light reflected by the optical information recording medium. Each of the four light receiving surfaces divided into four by at least two dividing lines, and the same from the intersection point of the dividing lines among the four light receiving surfaces of each of the second and third regions. A photodetector for outputting a sum signal of outputs of the light receiving surface of the second region and the light receiving surface of the third region located in the direction to the outside;
A servo signal generation circuit that generates a servo signal for performing position control of the objective lens based on a signal obtained from the light detector;
A control circuit for determining the type of the optical information recording medium based on the signal obtained from the light detector;
The control circuit generates a servo signal using both the signal output from the first area and the sum signal based on the determination result of the type of the optical information recording medium; An optical information reproducing apparatus characterized in that the servo signal generation circuit is controlled so as to select a case where a servo signal is generated using a signal output from the region of (1) and not using the sum signal.
前記コントロール回路は、前記判別結果がＤＶＤ−ＲＡＭディスクであるときは、前記第１の領域から出力される信号と前記和信号の両方を用いてサーボ信号を生成し、前記判別結果がＤＶＤ−ＲＯＭディスクであるときは、前記第１の領域から出力される信号を用い、かつ前記和信号を用いないでサーボ信号を生成するように、前記サーボ信号生成回路を制御することを特徴とする光学的情報再生装置。In the optical information reproducing apparatus according to claim 8,
When the determination result is a DVD-RAM disc, the control circuit generates a servo signal using both the signal output from the first area and the sum signal, and the determination result is a DVD-ROM. In the case of a disk, the servo signal generation circuit is controlled to generate a servo signal using a signal output from the first area and not using the sum signal. Information playback device.
前記光検出器から得られた信号に基づいて、前記対物レンズの位置制御を行うためのサーボ信号を生成するサーボ信号生成回路と、
前記光検出器から得られる信号に基づいて前記光学的情報記録媒体の種類を判別するコントロール回路と、を有し、
前記コントロール回路は、前記光学的情報記録媒体の種類の判別結果に基づいて、前記第１の領域から出力される出力線と前記結線された出力線の両方を用いてサーボ信号を生成する場合と、前記第１の領域から出力される出力線を用い、かつ前記結線された出力線を用いないでサーボ信号を生成する場合とを選択するように、前記サーボ信号生成回路を制御することを特徴とする光学的情報再生装置。A semiconductor laser light source for emitting a light beam, a light branching element for separating a light beam emitted from the semiconductor laser light source into at least 0th light, + 1st light and -1st light, and the three light beams An objective lens which condenses a light beam and irradiates a light spot on an optical information recording medium, and each of reflected light in which the 0th order light, + 1st order light and -1st order light are reflected by the optical information recording medium , And the second and third regions each have four light receiving surfaces divided into four by at least two dividing lines, Among the four light receiving surfaces of each of the second and third regions, the output lines of the light receiving surface of the second region and the light receiving surface of the third region located in the same direction from the intersection point of the dividing line An optical head having a photodetector internally connected to the detector for output to the outside;
A servo signal generation circuit that generates a servo signal for performing position control of the objective lens based on a signal obtained from the light detector;
A control circuit for determining the type of the optical information recording medium based on the signal obtained from the light detector;
The control circuit generates a servo signal using both the output line output from the first area and the connected output line based on the determination result of the type of the optical information recording medium. And controlling the servo signal generation circuit so as to select a case where a servo signal is generated using an output line output from the first area and not using the connected output line. Optical information reproduction device to be.
前記０次光、＋１次光、−１次光が前記光学的情報記録媒体で反射した反射光の各々を受光する第１、第２、第３の領域を有し、前記第２及び第３の領域が、それぞれ、少なくとも２本の分割線により４分割された４つの受光面を有し、前記第２、第３の領域の各々の４つの受光面のうち、前記分割線の交点から同じ向きに位置する前記第２の領域の受光面と前記第３の領域の受光面の出力の和信号を外部に出力する光検出器と、
前記光検出器から得られた前記和信号に基づいて、非点収差方式による焦点ずれ信号及び差動プッシュプル方式によるトラッキング誤差信号を生成するサーボ信号生成回路と、
前記和信号に基づき前記サーボ信号生成回路で生成された焦点ずれ信号及びトラッキング誤差信号を用いて、前記対物レンズの位置制御を行うアクチュエータ駆動回路と、を有することを特徴とする光学的情報再生装置。An objective lens for irradiating an optical information recording medium with a light beam branched into at least zero-order light, + 1st-order light, and -1st-order light;
It has first, second and third regions for receiving each of the reflected light that the 0th order light, + 1st order light and -1st order light reflected on the optical information recording medium, and the second and third areas Each of the four light receiving surfaces divided into four by at least two dividing lines, and the same from the intersection point of the dividing lines among the four light receiving surfaces of each of the second and third regions. A photodetector for outputting a sum signal of outputs of the light receiving surface of the second region and the light receiving surface of the third region located in the direction to the outside;
A servo signal generation circuit that generates a defocus signal according to an astigmatism method and a tracking error signal according to a differential push-pull method based on the sum signal obtained from the light detector;
An actuator drive circuit for controlling the position of the objective lens using the focus error signal and the tracking error signal generated by the servo signal generation circuit based on the sum signal. .
前記０次光、＋１次光、−１次光が前記光学的情報記録媒体で反射した反射光の各々を受光する第１、第２、第３の領域を有し、前記第２及び第３の領域が、それぞれ、少なくとも２本の分割線により４分割された４つの受光面を有し、前記第２、第３の領域の各々の４つの受光面のうち、前記分割線の交点から同じ向きに位置する前記第２の領域の受光面と前記第３の領域の受光面の出力の和信号を外部に出力する光検出器と、
前記光検出器から得られた信号に基づいて、前記対物レンズの位置制御を行うための焦点ずれ信号及びトラッキング差信号とを生成するサーボ信号生成回路と、
前記光検出器から得られる信号に基づいて前記光学的情報記録媒体の種類を判別するコントロール回路と、を有し、
前記コントロール回路は、前記光学的情報記録媒体の種類の判別結果に基づいて、前記和信号を用いて焦点ずれ信号及びトラッキング誤差信号の両方を生成する場合と、前記和信号を用いて焦点ずれ信号とトラッキング誤差信号のいずれか一方を生成する場合とを選択するように、前記サーボ信号生成回路を制御することを特徴とする光学的情報再生装置。An objective lens for irradiating an optical information recording medium with a light beam branched into at least zero-order light, + 1st-order light, and -1st-order light;
It has first, second and third regions for receiving each of the reflected light that the 0th order light, + 1st order light and -1st order light reflected on the optical information recording medium, and the second and third areas Each of the four light receiving surfaces divided into four by at least two dividing lines, and the same from the intersection point of the dividing lines among the four light receiving surfaces of each of the second and third regions. A photodetector for outputting a sum signal of outputs of the light receiving surface of the second region and the light receiving surface of the third region located in the direction to the outside;
A servo signal generation circuit that generates a focus error signal and a tracking difference signal for performing position control of the objective lens based on the signal obtained from the light detector;
A control circuit for determining the type of the optical information recording medium based on the signal obtained from the light detector;
The control circuit generates both the focus error signal and the tracking error signal using the sum signal based on the discrimination result of the type of the optical information recording medium, and the focus error signal using the sum signal. An optical information reproducing apparatus characterized in that the servo signal generation circuit is controlled so as to select one of the tracking error signal and the tracking error signal.
前記コントロール回路は、前記判別結果がＤＶＤ−ＲＡＭ又はＤＶＤ−ＲＯＭであるときは、前記和信号を用いて焦点ずれ信号及びトラッキング誤差信号の両方を生成し、前記判別結果がＣＤ又はＣＤ−ＲＯＭ又はＣＤ−Ｒであるときは、前記和信号を用いてトラッキング誤差信号のみを生成するように、前記サーボ信号生成回路を制御することを特徴とする光学的情報再生装置。In the optical information reproducing apparatus according to claim 12,
When the determination result is a DVD-RAM or a DVD-ROM, the control circuit generates both the defocus signal and the tracking error signal using the sum signal, and the determination result is a CD or a CD-ROM or An optical information reproducing apparatus characterized by controlling the servo signal generation circuit so as to generate only a tracking error signal using the sum signal when it is a CD-R.
前記光検出器から得られた信号に基づいて、前記対物レンズの位置制御を行うためのサーボ信号を生成するサーボ信号生成回路と、
前記光検出器から得られる信号に基づいて前記光学的情報記録媒体の種類を判別し、該判別結果に基づいて、前記サーボ信号生成回路におけるサーボ信号検出方式を選択するコントロール回路と、を有することを特徴とする光学的情報再生装置。An optical head according to claim 6 or 7;
A servo signal generation circuit that generates a servo signal for performing position control of the objective lens based on a signal obtained from the light detector;
And a control circuit that determines the type of the optical information recording medium based on the signal obtained from the light detector and selects a servo signal detection method in the servo signal generation circuit based on the determination result. An optical information reproducing apparatus characterized by
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