JPS63108538A - Lens actuator - Google Patents
Lens actuatorInfo
- Publication number
- JPS63108538A JPS63108538A JP25500386A JP25500386A JPS63108538A JP S63108538 A JPS63108538 A JP S63108538A JP 25500386 A JP25500386 A JP 25500386A JP 25500386 A JP25500386 A JP 25500386A JP S63108538 A JPS63108538 A JP S63108538A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- frame
- fixed
- lens frame
- permanent magnet
- 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 claims abstract description 15
- 238000006073 displacement reaction Methods 0.000 claims abstract description 6
- 230000007935 neutral effect Effects 0.000 claims abstract description 4
- 229910052751 metal Inorganic materials 0.000 claims abstract description 3
- 239000002184 metal Substances 0.000 claims abstract description 3
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 abstract description 3
- 230000010355 oscillation Effects 0.000 abstract 2
- 238000001514 detection method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229910052761 rare earth metal Inorganic materials 0.000 description 4
- 150000002910 rare earth metals Chemical class 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229910052693 Europium Inorganic materials 0.000 description 1
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- 229910052765 Lutetium Inorganic materials 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 229910052772 Samarium Inorganic materials 0.000 description 1
- 229910052771 Terbium Inorganic materials 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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、光学式記録再生装置の光学ヘッドに搭載スる
レンズアクチュエータに関する０〔従来の技術〕
従来光学ヘッドのレンズアクチュエータにおいては、レ
ンズを板ばねで支持する構造の特開昭５７−３７７４２
に開示された方法などが多く使用されていた。後にアク
セス時のレンズの残留振動を抑圧する目的で、レンズが
振動しにくい構造の特開昭５９−１０４７３５に開示さ
れた方法が考えられた〇
〔発明が解決しようとする問題点〕
しかし従来技術では、アクセス時にレンズの残留振動が
充分に抑圧される間の時間がアクセスタイムを長くする
原因となり、特に高速アクセスを要求される場合に問題
となった。Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a lens actuator mounted on an optical head of an optical recording/reproducing device. JP-A-57-37742 with a structure supported by leaf springs
Many methods such as those disclosed in were used. Later, for the purpose of suppressing the residual vibration of the lens during access, a method disclosed in Japanese Patent Application Laid-open No. 104735/1983 was devised in which the lens has a structure that makes it difficult to vibrate.〇 [Problem to be solved by the invention] However, the prior art In this case, the time it takes for the residual vibration of the lens to be sufficiently suppressed during access causes the access time to become long, which is a problem especially when high-speed access is required.
そこで本発明はこのような問題点を解決するためのもの
で、光学ヘッドアクセス時のレンズの変位を測定する機
能をレンズアクチュエータに付加することＫよって残留
振動を回路補償によつて抑圧することが可能なレンズア
クチュエータを提供するところにある。Therefore, the present invention is intended to solve these problems, and by adding a function to the lens actuator to measure the displacement of the lens when the optical head is accessed, residual vibration can be suppressed by circuit compensation. The objective is to provide a lens actuator that is possible.
本発明のレンズアクチュエータは、光学式記録再生装置
の、光学ヘッドに搭載するレンズアクチュエータにおい
て、前記光学ヘッドのヘッドフレームに固定された支持
シャフトと円筒対偶をなす円筒状のレンズフレームにレ
ンズを固定し、前記光学ヘッドフレームと前記レンズフ
レームを金属ばね、ゴム等の弾性部材によって連結し、
前記レンズフレームを、前記支持シャフトの軸方向と軸
回りの回転方向の変位が可能でかつ中立位置を有する状
ＭＫ支持して、前記レンズフレームの外周部に永久磁石
を固定し、該永久磁石の基本組成をＲ−Ｆ ｅ −Ｂと
し、前記ヘッドフレームに２個のホールセンサーを前記
永久磁石と対向する位置に固定し、前記レンズフレーム
の回転変位を検出する機能を有することを特徴とする。The lens actuator of the present invention is a lens actuator mounted on an optical head of an optical recording/reproducing device, in which a lens is fixed to a cylindrical lens frame that forms a cylindrical pair with a support shaft fixed to a head frame of the optical head. , the optical head frame and the lens frame are connected by an elastic member such as a metal spring or rubber;
The lens frame is supported by an MK that is movable in the axial direction of the support shaft and in the rotational direction around the axis and has a neutral position, and a permanent magnet is fixed to the outer circumference of the lens frame. The basic composition is R-Fe-B, two Hall sensors are fixed to the head frame at positions facing the permanent magnet, and the lens frame has a function of detecting rotational displacement of the lens frame.
以下本発明について図面に基づいて詳細に説明する。 The present invention will be explained in detail below based on the drawings.
第１図は本発明のレンズアクチュエータの平面図で、レ
ンズ１はレンズフレーム２に固定され、レンズフレーム
はヘッドフレーム（図示せず）に固定された支持シャフ
ト３と円筒対偶をなす。支持シャフトの軸方向の動きを
フォーカス方向、軸回りの回転運動をトラック方向とす
ると、アクセス時の残留振動が問題となるのは主として
トラック方向である。このため永久磁石４を図に示すよ
−）Ｋレンズフレームに固定し、ホールセンサー５．６
を永久磁石に対向させ、レンズフレームの回転によって
生じる磁場の変化からアクセス時のレンズフレームの残
留振動を検出することが可能となる。なお、永久磁石４
は基本組成が希土類金属（Ｒ）、鉄（Ｆθ）、４および
ボロン（Ｂ）からなる希土類永久磁石を用いることによ
って可動部が、小型、軽量な構造になりレンズアクチュ
エータの動特性を劣下させることが無い。基本組成がＲ
，ＩｒｅおよびＢからなる希土類永久礎石としては・Ｎ
（Ｌ−ＩＦｅ −Ｂ磁石が知られているが、Ｒとしては
、Ｙ。FIG. 1 is a plan view of the lens actuator of the present invention, in which a lens 1 is fixed to a lens frame 2, and the lens frame forms a cylindrical pair with a support shaft 3 fixed to a head frame (not shown). If the axial movement of the support shaft is defined as the focus direction, and the rotational movement around the axis is defined as the track direction, then residual vibrations during access mainly pose a problem in the track direction. For this purpose, the permanent magnet 4 is fixed to the K lens frame as shown in the figure, and the Hall sensor 5.
It is possible to detect the residual vibration of the lens frame at the time of access from the change in the magnetic field caused by the rotation of the lens frame. In addition, permanent magnet 4
By using a rare earth permanent magnet whose basic composition is rare earth metal (R), iron (Fθ), 4, and boron (B), the movable part has a small and lightweight structure, which reduces the dynamic characteristics of the lens actuator. Nothing happens. Basic composition is R
As a rare earth permanent cornerstone consisting of , Ire and B, ・N
(L-IFe-B magnets are known, but R is Y.
Ｏｅ、Ｐｒ、Ｎｄ、Ｐｍ、Ｓｍ、Ｅｕ、Ｇｄ、Ｔｂ 、
Ｄ７ 、ＨＯ、ＩＣｒ 、’Ｊ’ｍ 、Ｙ’ｂ 、およ
びＬｕの希土類全金属のうちの１種または２種以上であ
れば良い。Oe, Pr, Nd, Pm, Sm, Eu, Gd, Tb,
It may be one or more of the rare earth metals D7, HO, ICr, 'J'm, Y'b, and Lu.
第２図は残留振動を抑制するためのレンズ制御系ブロッ
ク図で、光学ヘッドアクセス時のレンズの残留振動を永
久磁石と２個のホールセンサによって構成される検出器
７で検出しアクチュエータ駆動回路８ヘフィードバック
してトラッキングアクチェエータ９を制御する０この時
の制御系の目標値Ａをレンズフレームの支持中立位置に
設定することによってレンズフレームの支持シャフト回
りの変位Ｂは、きわめて小さな量となる。FIG. 2 is a block diagram of a lens control system for suppressing residual vibration. The residual vibration of the lens when the optical head is accessed is detected by a detector 7 composed of a permanent magnet and two Hall sensors, and an actuator drive circuit 8 is detected. By setting the target value A of the control system at this time to the neutral support position of the lens frame, the displacement B of the lens frame around the support shaft becomes extremely small. .
第３図は検出回路図で、２個のホールセンサーを用いて
差動検出をすることによって、ノイズ、温度変化等に強
い構成としている。FIG. 3 is a detection circuit diagram, and the configuration is resistant to noise, temperature changes, etc. by performing differential detection using two Hall sensors.
以上述べたように本発明によれば、光学ヘッドのレンズ
アクチュエータに永久磁石とホールセンサーから成る変
位検出機能を付加したことにより、アクセス時のレンズ
の残留振動を抑圧する制御系を構成することが可能とな
り、光学ヘッドの高速アクセスが実現できる。なお、実
施例で示した様に永久磁石の基本組成をＲ−ＩＦ ｅ
−Ｂとすると、小型、軽量で、磁気特性の優れた永久磁
石となるので、検出感度が高く、レンズアクチュエータ
の動特性に影響を与えることが無い０本発明と同様の目
的を持つ手段として、特開昭６１−１３４９３７が考え
られているが、これはレンズフレームの支持方式に制限
を加えるが、本発明の手段を用いれば非接触検出のため
支持方式に制限を加えることか無い＠As described above, according to the present invention, by adding a displacement detection function consisting of a permanent magnet and a Hall sensor to the lens actuator of the optical head, it is possible to configure a control system that suppresses residual vibration of the lens during access. This makes it possible to achieve high-speed access of the optical head. In addition, as shown in the example, the basic composition of the permanent magnet is R-IF e
-B, the permanent magnet is small, lightweight, and has excellent magnetic properties, so it has high detection sensitivity and does not affect the dynamic characteristics of the lens actuator.As a means for achieving the same purpose as the present invention, JP-A-61-134937 has been considered, but this imposes restrictions on the support method of the lens frame, but if the means of the present invention is used, there is no restriction on the support method due to non-contact detection.
第１図は、本発明のレンズアクチュエータの平面図。 第２図は、レンズ制御系のブロック図。 第６図は、検出回路図０ 以 上 出願人 セイコーエプソン株式会社 ダ １ 回 酩 ３ｍ FIG. 1 is a plan view of the lens actuator of the present invention. FIG. 2 is a block diagram of the lens control system. Figure 6 is a detection circuit diagram 0 that's all Applicant: Seiko Epson Corporation Da 1 time Drunk 3m
Claims (1)
クチュエータにおいて、前記光学ヘッドのヘッドフレー
ムに固定された支持シャフトと円筒対偶をなす円筒状の
レンズフレームにレンズを固定し、前記ヘッドフレーム
と前記レンズフレームを金属ばね、ゴム等の弾性部材に
よって連結し、前記レンズフレームを、前記支持シャフ
トの軸方向と軸回りの回転方向の変位が可能でかつ中立
位置を有する状態に支持して、前記レンズフレームの外
周部に永久磁石を固定し、該永久磁石の基本組成をＲ−
Ｆｅ−Ｂとし、前記ヘッドフレームに２個のホールセン
サーを前記永久磁石と対向する位置に固定し、前記レン
ズフレームの回転変位を検出する機能を有することを特
徴とするレンズアクチュエータ。In a lens actuator mounted on an optical head of an optical recording/reproducing device, a lens is fixed to a cylindrical lens frame that is a cylindrical pair with a support shaft fixed to a head frame of the optical head, and the head frame and the lens are fixed to each other. The frames are connected by an elastic member such as a metal spring or rubber, and the lens frame is supported in a state where it can be displaced in the axial direction of the support shaft and in a rotational direction around the axis and has a neutral position. A permanent magnet is fixed on the outer periphery of the permanent magnet, and the basic composition of the permanent magnet is R-
A lens actuator made of Fe-B, having two Hall sensors fixed to the head frame at positions facing the permanent magnet, and having a function of detecting rotational displacement of the lens frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25500386A JPS63108538A (en) | 1986-10-27 | 1986-10-27 | Lens actuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25500386A JPS63108538A (en) | 1986-10-27 | 1986-10-27 | Lens actuator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63108538A true JPS63108538A (en) | 1988-05-13 |
Family
ID=17272849
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25500386A Pending JPS63108538A (en) | 1986-10-27 | 1986-10-27 | Lens actuator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63108538A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9828909B2 (en) | 2015-03-05 | 2017-11-28 | Dr.Ing. H.C.F. Porsche Aktiengesellschaft | Connecting rod and internal combustion engine |
-
1986
- 1986-10-27 JP JP25500386A patent/JPS63108538A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9828909B2 (en) | 2015-03-05 | 2017-11-28 | Dr.Ing. H.C.F. Porsche Aktiengesellschaft | Connecting rod and internal combustion engine |
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