JP2513589B2 - Optical disc tilt detector - Google Patents
Optical disc tilt detectorInfo
- Publication number
- JP2513589B2 JP2513589B2 JP5020644A JP2064493A JP2513589B2 JP 2513589 B2 JP2513589 B2 JP 2513589B2 JP 5020644 A JP5020644 A JP 5020644A JP 2064493 A JP2064493 A JP 2064493A JP 2513589 B2 JP2513589 B2 JP 2513589B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- optical disc
- optical
- emitted
- reflector
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Optical Recording Or Reproduction (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、光ディスクを記録再生
するための光ピックアップに於いて用いられる光ディス
クの傾斜検出装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tilt detecting device for an optical disc used in an optical pickup for recording and reproducing the optical disc.
【０００２】[0002]
【従来の技術】光ディスクの記録再生に於いて、ビーム
スポットを収差なく光ディスク上に形成することは重要
なことである。このビームスポットはレーザ光を対物レ
ンズによって絞り込むことにより得られるが、対物レン
ズは光ディスクの基板厚さを含んで設計されるため、光
ディスク面と対物レンズの光軸が直交するときにその本
来の性能を発揮する。2. Description of the Related Art In recording and reproducing an optical disk, it is important to form a beam spot on the optical disk without aberration. This beam spot is obtained by narrowing the laser light with an objective lens, but since the objective lens is designed to include the substrate thickness of the optical disc, its original performance when the optical axis of the optical disc and the optical axis of the objective lens are orthogonal to each other. Exert.
【０００３】しかしながら、光ディスクは一般にプラス
チックを成型して作られるため、そりが生じて光ディス
ク面と対物レンズとの直交関係が得られなくなり、ビー
ムスポットの劣化が生ずる。これを防ぐため、光ディス
クの傾きを検出し、その傾斜量だけ対物レンズを傾斜さ
せ、両者間の角度変化が生じないようにする傾斜制御が
行われる。However, since the optical disc is generally formed by molding plastic, warpage occurs and the orthogonal relationship between the optical disc surface and the objective lens cannot be obtained, and the beam spot deteriorates. In order to prevent this, the tilt of the optical disc is detected, and the tilt control is performed so that the objective lens is tilted by the tilt amount so that the angle change between the two does not occur.
【０００４】図１１はこの傾斜制御に用いられる従来の
傾斜検出装置の一例を示す概略構成図である。同図に於
いて、対物レンズ１は対物レンズホルダ２に取り付けら
れており、これらが可動部３を形成しており、図中に示
したＺ（フォーカス）方向及びＸ（トラッキング）方向
に可動である。この可動部３は図示していない支持装置
により固定部５に支持されており、この固定部５をＸＺ
面内で傾動させることにより光ディスク４がラジアル方
向に傾斜したときの補正が行われる。FIG. 11 is a schematic block diagram showing an example of a conventional inclination detecting device used for this inclination control. In the figure, the objective lens 1 is attached to an objective lens holder 2, and these form a movable portion 3, which is movable in the Z (focus) direction and the X (tracking) direction shown in the figure. is there. The movable portion 3 is supported by a fixed portion 5 by a supporting device (not shown), and the fixed portion 5 is moved to XZ.
By tilting in the plane, the correction when the optical disk 4 tilts in the radial direction is performed.
【０００５】傾斜量を知るための傾斜検出装置は、固定
部５上に発光素子６を配置し、これを挟んで受光素子７
が２個、Ｘ方向に配置されており、発光素子６から放射
された光が光ディスク４で反射し、受光素子７に照射す
る。光ディスク４に傾きがない場合には、両受光素子７
には反射光が均等に当たり、傾きがある場合には両者に
当たる光量が変化するから、両受光素子７の電気出力の
差から光ディスク４と固定部５との間の傾斜量を検出し
ている。In the inclination detecting device for knowing the inclination amount, the light emitting element 6 is arranged on the fixed portion 5, and the light receiving element 7 is sandwiched therebetween.
Are arranged in the X direction, and the light emitted from the light emitting element 6 is reflected by the optical disc 4 and irradiates the light receiving element 7. If the optical disc 4 has no inclination, both light receiving elements 7
Since the reflected light impinges evenly on the optical discs and the amount of light impinging on both of them changes when there is an inclination, the amount of inclination between the optical disk 4 and the fixed portion 5 is detected from the difference in the electrical output of both light receiving elements 7.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、傾斜検
出装置が固定部にあり、対物レンズは固定部に対して可
動部に取り付けられた支持装置により支持されている構
成では、極く低周波の傾きに対しての制御しかできな
い。高い周波数まで傾き制御をするには、発光素子と受
光素子を対物レンズやその可動部に設置することが考え
られるが、可動部を大きくせざるを得ないこと、発光素
子と受光素子の引き出し線の処理が難しくなること等の
難点がある。However, in the structure in which the tilt detecting device is provided in the fixed part and the objective lens is supported by the supporting device attached to the movable part with respect to the fixed part, the tilt of a very low frequency is obtained. You can only control In order to control the tilt up to a high frequency, it is conceivable to install the light emitting element and the light receiving element on the objective lens and its movable part, but it is necessary to make the movable part large and the lead line of the light emitting element and the light receiving element. However, there is a problem that the processing of is difficult.
【０００７】光ディスクと、光ディスクを記録又は再生
する光ピックアップと、光ピックアップの対物レンズ若
しくは対物レンズと一体的に可動する可動部に設けた光
反射体と、可動部と一体的に動かない固定部に配設した
発光部と、発光部からの出射光を前記光ディスクと光反
射体との双方を経由して受光し出射光の光強度変化を電
気信号に変換して傾き量を検出する受光部とを有する光
ディスクの傾斜検出装置において、受光部は、出射光を
光反射体，光ディスクの順に反射させて受光する第１の
受光素子と、出射光を光ディスク，光反射体の順に反射
させて受光する第２の受光素子を具備することを特徴と
している。また、光ディスクと、光ディスクを記録又は
再生する光ピックアップと、光ピックアップの対物レン
ズ若しくは対物レンズと一体的に可動する可動部に設け
た光反射体と、可動部と一体的に動かない固定部に配設
した第１及び第２の発光部と、発光部からの出射光を光
ディスクと光反射体との双方を経由して受光し出射光の
光強度変化を電気信号に変換して傾き量を検出する受光
部とを有する光ディスクの傾斜検出装置において、受光
部は、第１の発光部の出射光を光反射体，光ディスクの
順に反射させて受光する第１の受光素子と、第２の発光
部の出射光を光ディスク，光反射体の順に反射させて受
光する第２の受光素子とで構成することを特徴としてい
る。さらに、光ディスクと、光ディスクを記録又は再生
する光ピックアップと、光ピックアップの対物レンズ若
しくは対物レンズと一体的に可動する可動部に設けた光
反射体と、可動部と一体的に動かない固定部に配設しコ
リメート光を出射する発光部と、発光部からのコリメー
ト光が光ディスクと光反射体とに反射した反射戻り光を
集光して焦点位置付近で受光し反射戻り光の光強度変化
を電気信号に変換して傾き量を検出する受光部とを有す
る光ディスクの傾斜検出装置において、光反射体は、光
ディスク面に対して直交し且つ互いに直交する２つの反
射面で構成し、受光部は、光ディスクと光反射体の２つ
の反射面とに反射した反射戻り光を受光する交差状に分
割した４分割受光素子で構成することを特徴としてい
る。An optical disc, an optical pickup for recording or reproducing the optical disc, an objective lens of the optical pickup or a light reflector provided on a movable portion which is movable integrally with the objective lens, and a fixed portion which does not move integrally with the movable portion. And a light-receiving unit that receives light emitted from the light-emitting unit via both the optical disc and the light reflector, converts a change in light intensity of the emitted light into an electric signal, and detects the amount of tilt. In the inclination detecting device for an optical disc having: a light receiving portion, the first light receiving element receives the emitted light in the order of the light reflector and the optical disc, and the emitted light is reflected in the order of the optical disc and the light reflector to receive the light. The second light receiving element is provided. Also, an optical disc, an optical pickup for recording or reproducing the optical disc, a light reflector provided on an objective lens of the optical pickup or a movable portion that is movable integrally with the objective lens, and a fixed portion that does not move integrally with the movable portion. The first and second light-emitting portions provided and the light emitted from the light-emitting portions are received via both the optical disc and the light reflector, and the change in the light intensity of the emitted light is converted into an electrical signal to determine the amount of tilt. In a tilt detecting device for an optical disc having a light receiving unit for detecting, the light receiving unit includes a first light receiving element that receives the light emitted from the first light emitting unit by reflecting it in the order of a light reflector and the optical disc, and a second light emitting unit. It is characterized in that it is configured by a second light receiving element which receives the light emitted from the part by reflecting the light emitted from the optical disc and the light reflector in this order. Further, an optical disc, an optical pickup for recording or reproducing the optical disc, a light reflector provided on an objective lens of the optical pickup or a movable portion that is movable integrally with the objective lens, and a fixed portion that does not move integrally with the movable portion. A light emitting section that is arranged to emit collimated light and the reflected return light that the collimated light from the light emitting section reflects on the optical disk and the light reflector are collected and received near the focal position to change the light intensity of the reflected return light. In a tilt detecting device for an optical disc having a light receiving unit for converting into an electric signal and detecting a tilt amount, the light reflector is composed of two reflecting surfaces which are orthogonal to the optical disc surface and orthogonal to each other, and the light receiving unit is It is characterized in that the optical disc and the two reflecting surfaces of the light reflector are composed of four-divided light receiving elements that are divided in a cross shape and receive the reflected return light.
【０００８】[0008]
【作用】光ディスクが傾斜しても対物レンズの光軸と光
ディスク面とが直交状態にあるときには受光素子部の光
量変化はなく、両者間に角度変化があるときにのみ光量
変化が生じることを利用することにより傾斜検出が可能
となる。図１２はこのことを説明するための説明図であ
り、ＡＯは対物レンズの光軸の向きであり、光反射体が
設けられた可動部に相当し、ＯＢはディスク面に相当す
る。[Effect] Even if the optical disc is tilted, there is no change in the light amount of the light receiving element when the optical axis of the objective lens and the optical disc surface are orthogonal to each other, and the light amount changes only when there is an angle change between them. By doing so, the inclination can be detected. FIG. 12 is an explanatory diagram for explaining this, AO is the direction of the optical axis of the objective lens, corresponds to the movable portion provided with the light reflector, and OB corresponds to the disk surface.
【０００９】Ｐ，Ｑはそれぞれ発光素子，受光素子であ
りＰより放射された光は光反射体のＣに当たり、ディス
ク面のＤに当たった後Ｑに達する。ディスク面に相当す
るＯＢが傾きＯＢ’となったときには、Ｐより発する光
はＰ→Ｃ→Ｄ'→Ｑ'となり、Ｑ点の光量は変化するが、
光反射体のあるＡＯが角Ｂ'ＯＢと同量だけ傾斜しＡ'Ｏ
となっている場合、即ち角Ａ'ＯＢ'＝角ＡＯＢの条件が
保たれていれば、光線はＰ→Ｃ'→Ｄ"→ＱとなりＱ点の
光量変化は生じない。従って光ディスクと対物レンズに
よって形成される角度の変動量を光量差として検出する
ことができる。P and Q are a light emitting element and a light receiving element, respectively, and the light emitted from P hits C of the light reflector and reaches Q after hitting D of the disk surface. When the OB corresponding to the disk surface has an inclination OB ', the light emitted from P becomes P->C->D'-> Q ', and the light quantity at the point Q changes,
AO with a light reflector is inclined by the same amount as angle B'OB
In other words, if the condition of angle A′OB ′ = angle AOB is maintained, the light ray becomes P → C ′ → D ″ → Q and the light quantity does not change at point Q. Therefore, the optical disc and the objective lens It is possible to detect the variation amount of the angle formed by the light amount difference.
【００１０】[0010]
【実施例】本発明の一実施例を図１の概略構成を示す側
面図と図２の正面図で説明する。これらの図において、
対物レンズ１は対物レンズホルダ２に取り付けられてお
り、この両者が可動部３を構成する。そしてこの可動部
３に(この例では対物レンズ部に)光反射体８が設けられ
ている。一方この可動部３とは一体に動かない固定部５
に発光素子６及びこの発光素子６の両側に２分割の受光
素子７を配置している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the side view showing the schematic construction of FIG. 1 and the front view of FIG. In these figures,
The objective lens 1 is attached to an objective lens holder 2, and both of them constitute a movable portion 3. A light reflector 8 is provided on the movable portion 3 (on the objective lens portion in this example). On the other hand, the fixed part 5 that does not move integrally with the movable part 3
In addition, the light emitting element 6 and the light receiving element 7 divided in two on both sides of the light emitting element 6 are arranged.
【００１１】発光素子６より発した光の一部は発光素子
６→光反射体８→光ディスク４→受光素子７の経路を取
り、もう一部は発光素子６→光ディスク４→光反射体８
→受光素子７の経路を取る。この様子を図３から図５の
模式図に示し、前記２つの経路を(ａ),(ｂ)に分けて説
明している。図３(ａ),(ｂ)は光ディスク４が傾いたと
きの反射光の移動方向を示している。図４(ａ)，(ｂ)は
光ディスク４が上下(Ｚ)方向に移動した場合、図５
(ａ)，(ｂ)は可動部３が光ディスク４の面に沿って（Ｘ
方向）に移動した場合で、Ｐは発光源，Ｑは定常状態の
戻り光位置，Ｑ' は前記移動によって戻り光が移動した
ときの位置を示している。A part of the light emitted from the light emitting element 6 takes the route of the light emitting element 6 → the light reflector 8 → the optical disk 4 → the light receiving element 7, and the other part thereof is the light emitting element 6 → the optical disk 4 → the light reflector 8
→ Take the path of the light receiving element 7. This state is shown in the schematic diagrams of FIGS. 3 to 5, and the two routes are described separately for (a) and (b). 3A and 3B show the moving direction of the reflected light when the optical disc 4 is tilted. 4A and 4B show the case where the optical disc 4 moves in the vertical (Z) direction.
In (a) and (b), the movable part 3 is arranged along the surface of the optical disc 4 (X
Direction), P is a light emitting source, Q is a return light position in a steady state, and Q ′ is a position when the return light is moved by the movement.
【００１２】光ディスク４の傾きを検出するには光ディ
スク４の傾いた場合に出力があり、光ディスク４が上下
動、もしくは可動部３が左右に可動した場合に出力が出
ないように受光素子７を配置する必要があるが、光ディ
スク４の傾いた場合の２系統の戻り光は図３(ａ)，(ｂ)
の矢印で示すように、逆向きに動き、光ディスク４が上
下動、もしくは可動部３が左右に可動した場合には同方
向に動く。従って２分割受光素子７を、発光素子６の両
側で径方向に分割面が並んで配置する、図３から図５の
(ａ)，(ｂ)で示すＱ点の位置に配置して、図２と同様に
受光素子面に符号を付して出力を（Ａ＋Ｄ）−（Ｂ＋
Ｃ）と算出することによって傾斜量のみに関係する出力
が得られる。In order to detect the tilt of the optical disk 4, there is an output when the optical disk 4 is tilted, and the light receiving element 7 is provided so as not to output when the optical disk 4 moves up and down or the movable part 3 moves left and right. It is necessary to dispose them, but when the optical disk 4 is tilted, the return light of two systems is shown in FIGS. 3 (a) and 3 (b).
As indicated by the arrow, when the optical disk 4 moves up and down or the movable part 3 moves left and right, it moves in the same direction. Therefore, the split light receiving elements 7 are arranged on both sides of the light emitting element 6 so that the split surfaces are arranged side by side in the radial direction.
It is arranged at the position of the point Q shown in (a) and (b), and the output is (A + D)-(B +
By calculating as C), an output relating only to the amount of tilt can be obtained.
【００１３】図６の概略構成を示す側面図と図７の正面
図に示す構成は、本発明の他の実施例で光ビームの拡が
りが少ない発光素子６ａ，６ｂを２個用い、２個の２分
割受光素子７ａ，７ｂで受光している。発光素子６ａか
ら出た光は、発光素子６ａ→光反射体８→光ディスク４
→受光素子７ａ、発光素子６ｂからの光は、発光素子６
ｂ→光ディスク４→光反射体８→受光素子７ｂの経路を
たどる。傾斜検出は前記実施例と同様に、受光素子７
ａ，７ｂの２分割受光面（Ａ＋Ｄ）−（Ｂ＋Ｃ）によっ
て行われる。In the side view showing the schematic structure of FIG. 6 and the structure shown in the front view of FIG. 7, two light emitting elements 6a and 6b having a small spread of a light beam are used in another embodiment of the present invention. Light is received by the two-divided light receiving elements 7a and 7b. The light emitted from the light emitting element 6a is the light emitting element 6a → the light reflector 8 → the optical disk 4
→ Light from the light receiving element 7a and the light emitting element 6b is emitted from the light emitting element 6
Follow the path of b → optical disc 4 → light reflector 8 → light receiving element 7b. Inclination detection is carried out in the same manner as in the above-mentioned embodiment by the light receiving element
This is performed by the two-divided light receiving surfaces (A + D)-(B + C) of a and 7b.
【００１４】以上の実施例に於いて、光反射体の反射面
はディスク面と直交するように表わしているが、任意の
角度を取り得る。その場合単に戻り光が発光素子の出射
方向と平行にならないだけで、効果は同じである。In the above embodiments, the reflecting surface of the light reflector is shown as being orthogonal to the disk surface, but it can take any angle. In that case, the return light does not simply become parallel to the emission direction of the light emitting element, but the effect is the same.
【００１５】さらに他の実施例を図８の概略構成図で説
明する。固定部５に取り付けられたコリメート発光部９
から出射されたコリメート光は、対物レンズ１の側面に
設けられた光反射体８によって反射され、さらに光ディ
スク４によって反射される。そして、その戻り光は凸レ
ンズ１０により収束光となり、焦点位置付近に配置され
た２分割受光素子１１にビームスポットを形成する。Still another embodiment will be described with reference to the schematic block diagram of FIG. Collimating light emitting part 9 attached to the fixed part 5
Collimated light emitted from the side surface of the objective lens 1
The light is reflected by the light reflector 8 provided and
It is reflected by the disc 4. Then, the returned light becomes convergent light by the convex lens 10 and forms a beam spot on the two-divided light receiving element 11 arranged near the focal position.
【００１６】その様子を図９（ａ）（ｂ）の説明図に示
す。光反射体８と光ディスク４が垂直となるときのビー
ムスポット位置が、図９(ａ)に示すように２分割受光素
子１１の中心に位置するように設置した場合、相対的な
傾きに変化があったときは、図９(ｂ)に示すように、ビ
ームスポットの位置が変化し、光反射体８と光ディスク
４の相対角度が９０°以下になったとき上方に、９０°
以上になったとき下方にビームスポットが移動する。そ
して、受光部１１ａと受光部１１ｂにおける光量差を差
信号として検出することによって、相対的な傾きの量及
び方向を知ることができる。This is shown in the explanatory views of FIGS. 9 (a) and 9 (b). If the beam spot position when the light reflector 8 and the optical disc 4 are perpendicular to each other is installed so as to be located at the center of the two-divided light receiving element 11 as shown in FIG. 9A, the relative tilt changes. If so, as shown in FIG. 9 (b), the position of the beam spot changes, and when the relative angle between the light reflector 8 and the optical disk 4 becomes 90 ° or less, it moves upward by 90 °.
When the above is reached, the beam spot moves downward. Then, by detecting the light amount difference between the light receiving units 11a and 11b as a difference signal, the amount and direction of the relative inclination can be known.
【００１７】さらに他の実施例としては、図１０の概略
構成の斜視図に示すように、互いに直交する２つの反射
面１２，１３を光ディスク４に対しても直交するよう
に、対物レンズ１或いはその可動部３に設置すると共
に、受光部に交差状に四分割された４分割受光素子１４
を用いるものを挙げることができる。この方式によれ
ば、前記実施例と同様の原理で直交する二方向の相対的
傾きの量及び方向を検出することができる。As yet another embodiment, as shown in the perspective view of the schematic structure of FIG. 10, the objective lens 1 or the two reflecting surfaces 12 and 13 which are orthogonal to each other are arranged so as to be orthogonal to the optical disc 4. A four-division light-receiving element 14 which is installed in the movable portion 3 and which is divided into four light-receiving portions in a cross shape.
Can be mentioned. According to this method, it is possible to detect the amount and direction of the relative tilt in two orthogonal directions based on the same principle as that of the above-described embodiment.
【００１８】[0018]
【発明の効果】本発明によれば、発光素子と受光素子と
を対物レンズと一体に動かない固定部に配置したまま
で、対物レンズと光ディスクの間の傾き量を知ることが
できるため、組立が容易で精度の良い傾斜検出装置を得
ることができる。According to the present invention, the amount of tilt between the objective lens and the optical disk can be known while the light emitting element and the light receiving element are arranged in the fixed portion that does not move integrally with the objective lens. It is possible to obtain a tilt detecting device that is easy and has high accuracy.
【図１】本発明の一実施例の概略構成を示す側面図。FIG. 1 is a side view showing a schematic configuration of an embodiment of the present invention.
【図２】図１の正面図。FIG. 2 is a front view of FIG. 1;
【図３】本発明を説明するための模式図。FIG. 3 is a schematic diagram for explaining the present invention.
【図４】本発明を説明するための模式図。FIG. 4 is a schematic diagram for explaining the present invention.
【図５】本発明を説明するための模式図。FIG. 5 is a schematic diagram for explaining the present invention.
【図６】本発明の他の実施例の概略構成を示す側面図。FIG. 6 is a side view showing a schematic configuration of another embodiment of the present invention.
【図７】図６の正面図。FIG. 7 is a front view of FIG. 6;
【図８】本発明の他の実施例を示す概略構成図。FIG. 8 is a schematic configuration diagram showing another embodiment of the present invention.
【図９】図８の説明図。9 is an explanatory diagram of FIG. 8. FIG.
【図１０】本発明の他の実施例を示す概略構成の斜視
図。FIG. 10 is a perspective view of a schematic configuration showing another embodiment of the present invention.
【図１１】従来例を示す概略構成図。FIG. 11 is a schematic configuration diagram showing a conventional example.
【図１２】本発明を説明するための説明図。FIG. 12 is an explanatory diagram for explaining the present invention.
１ 対物レンズ ２ 対物レンズホルダ ３ 可動部 ４ 光ディスク ５ 固定部 ６ 発光素子 ７ 受光素子 ８ 光反射体 ９ コリメート発光部 １０ 凸レンズ １１ ２分割受光素子 １２ 反射面 １３ 反射面 １４ ４分割受光素子 DESCRIPTION OF SYMBOLS 1 Objective lens 2 Objective lens holder 3 Movable part 4 Optical disk 5 Fixed part 6 Light emitting element 7 Light receiving element 8 Light reflector 9 Collimating light emitting part 10 Convex lens 11 2 split light receiving element 12 Reflective surface 13 Reflective surface 14 4 split light receiving element
Claims (3)
再生する光ピックアップと、該光ピックアップの対物レ
ンズ若しくは対物レンズと一体的に可動する可動部に設
けた光反射体と、前記可動部と一体的に動かない固定部
に配設した発光部と、該発光部からの出射光を前記光デ
ィスクと前記光反射体との双方を経由して受光し前記出
射光の光強度変化を電気信号に変換して傾き量を検出す
る受光部とを有する光ディスクの傾斜検出装置におい
て、前記受光部は、前記出射光を前記光反射体，前記光
ディスクの順に反射させて受光する第１の受光素子と、
前記出射光を前記光ディスク，前記光反射体の順に反射
させて受光する第２の受光素子を具備することを特徴と
する光ディスクの傾斜検出装置。1. An optical disc, an optical pickup for recording or reproducing the optical disc, an objective lens of the optical pickup or a light reflector provided on a movable portion integrally movable with the objective lens, and an integral body with the movable portion. A light emitting portion disposed on a fixed portion that does not move, and light emitted from the light emitting portion is received via both the optical disk and the light reflector, and a change in light intensity of the emitted light is converted into an electric signal. In a tilt detecting device for an optical disc having a light receiving unit for detecting a tilt amount, the light receiving unit includes a first light receiving element that receives the emitted light by reflecting the emitted light in the order of the light reflector and the optical disc,
Wherein the optical disc emitted light, the inclination detecting device of an optical disk which is characterized that you comprising a second light receiving element for receiving is reflected in the order of the light reflector.
再生する光ピックアップと、該光ピックアップの対物レ
ンズ若しくは対物レンズと一体的に可動する可動部に設
けた光反射体と、前記可動部と一体的に動かない固定部
に配設した第１及び第２の発光部と、該発光部からの出
射光を前記光ディスクと前記光反射体との双方を経由し
て受光し前記出射光の光強度変化を電気信号に変換して
傾き量を検出する受光部とを有する光ディスクの傾斜検
出装置において、前記受光部は、前記第１の発光部の出
射光を前記光反射体，前記光ディスクの順に反射させて
受光する第１の受光素子と、前記第２の発光部の出射光
を前記光ディスク，前記光反射体の順に反射させて受光
する第２の受光素子を具備することを特徴とする光ディ
スクの傾斜検出装置。2. An optical disc, an optical pickup for recording or reproducing the optical disc, an objective lens of the optical pickup or a light reflector provided on a movable portion which is movable integrally with the objective lens, and an integral body with the movable portion. The first and second light emitting portions arranged on the stationary portion that does not move, and the light emitted from the light emitting portions are received via both the optical disc and the light reflector, and the light intensity of the emitted light changes. In a tilt detecting device for an optical disc having a light receiving unit for converting the electric signal into an electric signal to detect the tilt amount, the light receiving unit reflects the light emitted from the first light emitting unit in the order of the light reflector and the optical disc. And a second light receiving element for receiving the light emitted from the second light emitting portion by sequentially reflecting the light emitted from the second light emitting portion in the order of the optical disk and the light reflector. Detector .
再生する光ピックアップと、該光ピックアップの対物レ
ンズ若しくは対物レンズと一体的に可動する可動部に設
けた光反射体と、前記可動部と一体的に動かない固定部
に配設しコリメート光を出射する発光部と、該発光部か
らのコリメート光が前記光ディスクと前記光反射体とに
反射した反射戻り光を集光して焦点位置付近で受光し前
記反射戻り光の光強度変化を電気信号に変換して傾き量
を検出する受光部とを有する光ディスクの傾斜検出装置
において、前記光反射体は、前記光ディスク面に対して
直交し且つ互いに直交する２つの反射面で構成し、前記
受光部は、前記光ディスクと前記光反射体の２つの反射
面とに反射した反射戻り光を受光する交差状に分割した
４分割受光素子で構成することを特徴とする光ディスク
の傾斜検出装置。3. An optical disc, an optical pickup for recording or reproducing the optical disc, an objective lens of the optical pickup or a light reflector provided on a movable portion which is movable integrally with the objective lens, and an integral body with the movable portion. A light emitting portion which is disposed on a fixed portion which does not move and emits collimated light, and collimated light from the light emitting portion collects reflected return light reflected by the optical disc and the light reflector to receive light near a focal position. In the tilt detecting device for an optical disc, which includes a light receiving unit for converting a change in the light intensity of the reflected return light into an electric signal to detect the tilt amount, the light reflectors are orthogonal to the optical disc surface and mutually orthogonal. The optical receiver and the two reflective surfaces of the light reflector are composed of two reflective surfaces, and the light receiving section is a four-divided light receiving element divided into cross shapes for receiving the reflected return light reflected by the optical disk and the two reflective surfaces of the light reflector. A tilt detecting device for an optical disk, which is characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5020644A JP2513589B2 (en) | 1993-01-13 | 1993-01-13 | Optical disc tilt detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5020644A JP2513589B2 (en) | 1993-01-13 | 1993-01-13 | Optical disc tilt detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06318336A JPH06318336A (en) | 1994-11-15 |
| JP2513589B2 true JP2513589B2 (en) | 1996-07-03 |
Family
ID=12032940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5020644A Expired - Fee Related JP2513589B2 (en) | 1993-01-13 | 1993-01-13 | Optical disc tilt detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2513589B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03137831A (en) * | 1989-10-24 | 1991-06-12 | Yamaha Corp | Optical disk device |
-
1993
- 1993-01-13 JP JP5020644A patent/JP2513589B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06318336A (en) | 1994-11-15 |
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