JPS6348624A - Optical head device - Google Patents
Optical head deviceInfo
- Publication number
- JPS6348624A JPS6348624A JP19121386A JP19121386A JPS6348624A JP S6348624 A JPS6348624 A JP S6348624A JP 19121386 A JP19121386 A JP 19121386A JP 19121386 A JP19121386 A JP 19121386A JP S6348624 A JPS6348624 A JP S6348624A
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric
- fixed
- head device
- optical head
- parallel plate
- 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.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 28
- 230000004907 flux Effects 0.000 abstract description 3
- 230000008878 coupling Effects 0.000 abstract 2
- 238000010168 coupling process Methods 0.000 abstract 2
- 238000005859 coupling reaction Methods 0.000 abstract 2
- 230000000694 effects Effects 0.000 description 2
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、光学記録媒体に対して情報の記録・ｐｆ生を
行う光学ヘッド装とに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical head device for recording information on an optical recording medium and generating a PF.
［従来の技術］
二の種の光学へラド装置においては、光束をディスク面
に正しく集束させるようにフォーカシングを行なうと共
に、光デイスク上のトラックに光束を追従させるように
トラッキングを行なう必要があり、フォーカシング信号
及びトラッキング信号により光学系をどのように移動制
御するがということが重要である。[Prior Art] In the two types of optical herad devices, it is necessary to perform focusing so that the light beam is correctly focused on the disk surface, and to perform tracking so that the light beam follows the track on the optical disk. What is important is how to control the movement of the optical system using the focusing signal and the tracking signal.
従来、この種の移動制御には、フォーカシングにおいて
は対物レンズをボイスコイルモータにより移動させトラ
ッキングには対物レンズに連結された平行板バネを電磁
移動手段により移動させていた。Conventionally, in this type of movement control, the objective lens is moved by a voice coil motor for focusing, and a parallel plate spring connected to the objective lens is moved by an electromagnetic moving means for tracking.
［解決すべき問題点］
上述したように従来の光学ヘッド装置は、対物レンズを
電磁移動手段により移動しフォーカシング及びトラッキ
ングを行なっていたので、コイル及び磁石等が必ず存在
することになり、そのため構成部品点数が多くなり、か
つ構造が複雑になるという欠点があった。[Problems to be Solved] As mentioned above, in conventional optical head devices, focusing and tracking were performed by moving the objective lens using electromagnetic moving means, so coils, magnets, etc. were always present, and therefore the configuration The disadvantages are that the number of parts increases and the structure becomes complex.
ｒ問題点の解決手段］
上記従来の問題点を解決する本発明の光学ヘッド装置は
、対物レンズをレンズ光軸方向並びにレンズ光軸と直角
方向に移動制御させる光学ヘッド装置において、圧電素
子にて成形された２組の平行板バネを互いのバネ面がほ
ぼ直角となるように連結し、一方の平行板バネの一端を
本体に固定すると共に、他方の平行板バネの一端を前記
対物レンズに固定した構成となっている。Solution to Problem] An optical head device of the present invention that solves the above-mentioned conventional problems is an optical head device that controls the movement of an objective lens in the direction of the optical axis of the lens and in the direction perpendicular to the optical axis of the lens. Two sets of molded parallel plate springs are connected so that their spring surfaces are substantially perpendicular to each other, one end of one parallel plate spring is fixed to the main body, and one end of the other parallel plate spring is attached to the objective lens. It has a fixed configuration.
［実施例］
以下、本発明について図面を参照して説明する。第１図
は本発明の一実施例に係る光学ヘッド装置を示す斜視図
、第２図は第１図におけるＡ−Ａ断面図である。[Example] The present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an optical head device according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line AA in FIG.
この光学ヘッド装置は、基台１とこの基台ｌに対して移
動可能な可動体２とにより構成されている。This optical head device includes a base 1 and a movable body 2 that is movable with respect to the base 1.
基台ｌには、その一端部に凸形状をした固定側面１ａが
存在し、この固定側面１ａには光ディスク（図示せず）
のトラッキング方向に移動する圧電平行バネ３ａ−３ｂ
の一端が固定されている。The base l has a convex fixed side surface 1a at one end thereof, and an optical disk (not shown) is mounted on this fixed side surface 1a.
piezoelectric parallel springs 3a-3b moving in the tracking direction of
One end is fixed.
また、圧電平行板バネ３ａ−３ｂの他端部には連結ブロ
ック４が取付けられており、この連結ブロック４によっ
て圧電平行板バネ３ａ−３ｂと直角方向（フォーカス方
向）に圧電平行板バネ５ａ−５ｂが連結されている。Further, a connecting block 4 is attached to the other end of the piezoelectric parallel plate springs 3a-3b, and the connecting block 4 allows the piezoelectric parallel plate springs 5a-3b to move in a direction perpendicular to the piezoelectric parallel plate springs 3a-3b (focus direction). 5b are connected.
さらに、圧電平行板バネ５ａ−５ｂの他端部には、対物
レンズ６を保持した可動体２が固定されている。また、
基台１には対物レンズ６の下方に光束通過穴７が設けら
れている。Further, a movable body 2 holding an objective lens 6 is fixed to the other end of the piezoelectric parallel plate springs 5a and 5b. Also,
A light flux passage hole 7 is provided in the base 1 below the objective lens 6.
このような構成を有する光学ヘッド装置（但し、レーザ
ダイオードおよび光学系等の光学ベースは図示せず）は
その本体が、光ディスク（図示せず）をその径方向に移
動させるためのリニアアクチュエータ等の移動機構（図
示せず）に対して固定されている。An optical head device having such a configuration (however, an optical base such as a laser diode and an optical system is not shown) has a main body that is equipped with a linear actuator or the like for moving an optical disk (not shown) in its radial direction. It is fixed relative to a moving mechanism (not shown).
次に可動体２の移動制御方法をフォーカシング制御を例
にとって説明する。すなわち、レンズ６が光ディスクに
接近しすぎた場合には、圧電平行板バネ５ａ−５ｂに第
３図（ｂ）の如くなるように次式（１）に従って電圧を
加え、対物レンズ６を同図（ａ）の状態より下げる。Next, a method for controlling the movement of the movable body 2 will be explained using focusing control as an example. That is, if the lens 6 comes too close to the optical disk, a voltage is applied to the piezoelectric parallel plate springs 5a-5b according to the following equation (1) as shown in FIG. 3(b), and the objective lens 6 is moved lower than the state in (a).
（ＶＡ−ＶＢ）＞ （Ｖａ −Ｖｃ ）（ただしｖＡ
≧■８≧ＶＣ） 、 、 、（１）また、対物レンズ
６と光ディスクが離れすぎた場合には、圧電平行板バネ
５ａ−５ｂに同図（ｃ）の如くなるように次式（２）に
従って電圧を加え、対物レンズ６を同図（ａ）の状態よ
り上げる６（ＶＡ −Ｖｅ ） ＜ （ＶＢ
−Ｖｃ ）（ただＬＶＡ ≧Ｖａ ≧Ｖｃ ）
、 、 、 （２）ここで、光ディスクより反射して来
た光束を用いフォーカシングサーボ信号を発生させ、対
物レンズ６と光ディスクとの距離を常に適正に保つよう
にＶＡ 、Ｖｅ 、Ｖｃ （ただしＶＡ≧ＶＢ≧
Ｖｃ）の値を制御すれば、可動体２はフォーカシング方
向に移動制御される。(VA-VB)> (Va-Vc) (however, vA
≧■8≧VC) , , , (1) If the objective lens 6 and the optical disk are too far apart, the following equation (2) is applied to the piezoelectric parallel plate springs 5a-5b as shown in FIG. 6 (VA - Ve ) < (VB
-Vc) (only LVA ≧Va ≧Vc)
, , , (2) Here, a focusing servo signal is generated using the light beam reflected from the optical disc, and VA, Ve, Vc (however, VA≧ VB≧
By controlling the value of Vc), the movement of the movable body 2 in the focusing direction is controlled.
また、同様の原理にてトラッキング方向の移動制御も可
能となり、圧電平行板バネ５ａ−５ｂの可動体２が存在
しない端部と圧電平行板バネ３ａ−３ｂの固定側面１ａ
に固定されない端部とを連結ブロック４により互いに直
角になるように連結すれば、可動体２はフォーカシング
方向にもトラッキング方向にも移動制御可能となる。Furthermore, movement control in the tracking direction is also possible using the same principle, and the ends of the piezoelectric parallel plate springs 5a-5b where the movable body 2 does not exist and the fixed side surface 1a of the piezoelectric parallel plate springs 3a-3b
By connecting the end portions that are not fixed to each other by a connecting block 4 so as to be perpendicular to each other, the movement of the movable body 2 can be controlled in both the focusing direction and the tracking direction.
［発明の効果］
以上説明したように本発明の光学ヘッド装置は、圧電素
子により成形された２組の平行板バネを互いのバネ面が
ほぼ直角となるように連結し、一方の平行板バネの一端
を本体に固定し、他方の平行板バネの一端を対物レンズ
に固定する構成としたので、対物レンズをフォーカシン
グおよびトラッキングに移動ル制御でき、かつ構成部品
点数を低減できると共に構成が簡素化できるという効果
がある。[Effects of the Invention] As explained above, the optical head device of the present invention connects two sets of parallel plate springs formed by piezoelectric elements so that their spring surfaces are substantially perpendicular to each other, and One end of the parallel plate spring is fixed to the main body, and one end of the other parallel leaf spring is fixed to the objective lens, so the objective lens can be controlled for focusing and tracking, and the number of components can be reduced and the configuration simplified. There is an effect that it can be done.
第１図は本発明の一実施例に係る光学ヘッド装置の斜視
図、第２図は第１図のＡ−Ａ断面図、第３図（ａ） 、
（ｂ） 、（ｃ）は第１図の装置における対物レンズの
フォーカシング方向の移動の様子を示した断面図である
。
１：基台 １ａ：固定側面
２：可動体
３ａ−３ｂ、５ａ−５ｂ：圧電平行板バネ４：連結ブロ
ック ６：対物レンズ
７：光束通過穴FIG. 1 is a perspective view of an optical head device according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. 3(a).
(b) and (c) are cross-sectional views showing the movement of the objective lens in the focusing direction in the apparatus of FIG. 1; 1: Base 1a: Fixed side 2: Movable body 3a-3b, 5a-5b: Piezoelectric parallel plate spring 4: Connection block 6: Objective lens 7: Light flux passing hole
Claims (1)
方向に移動制御させる光学ヘッド装置において、 圧電素子にて成形された２組の平行板バネを互いのバネ
面がほぼ直角となるように連結し、一方の平行板バネの
一端を本体に固定すると共に、他方の平行板バネの一端
を前記対物レンズに固定したことを特徴とする光学ヘッ
ド装置。[Scope of Claims] An optical head device for controlling the movement of an objective lens in the direction of the optical axis of the lens and in the direction perpendicular to the optical axis of the lens, comprising two sets of parallel plate springs formed by piezoelectric elements whose spring surfaces are substantially perpendicular to each other. An optical head device characterized in that one end of one parallel plate spring is fixed to the main body, and one end of the other parallel plate spring is fixed to the objective lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19121386A JPS6348624A (en) | 1986-08-15 | 1986-08-15 | Optical head device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19121386A JPS6348624A (en) | 1986-08-15 | 1986-08-15 | Optical head device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6348624A true JPS6348624A (en) | 1988-03-01 |
Family
ID=16270788
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19121386A Pending JPS6348624A (en) | 1986-08-15 | 1986-08-15 | Optical head device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6348624A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03235005A (en) * | 1990-02-09 | 1991-10-21 | Olympus Optical Co Ltd | Scanning tunneling microscope |
| US7627877B2 (en) * | 2004-12-15 | 2009-12-01 | Hon Hai Precision Industry Co., Ltd. | Objective lens actuator and optical pickup unit employing the same |
-
1986
- 1986-08-15 JP JP19121386A patent/JPS6348624A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03235005A (en) * | 1990-02-09 | 1991-10-21 | Olympus Optical Co Ltd | Scanning tunneling microscope |
| US7627877B2 (en) * | 2004-12-15 | 2009-12-01 | Hon Hai Precision Industry Co., Ltd. | Objective lens actuator and optical pickup unit employing the same |
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