JPH0311009B2 - - Google Patents
Info
- Publication number
- JPH0311009B2 JPH0311009B2 JP56149764A JP14976481A JPH0311009B2 JP H0311009 B2 JPH0311009 B2 JP H0311009B2 JP 56149764 A JP56149764 A JP 56149764A JP 14976481 A JP14976481 A JP 14976481A JP H0311009 B2 JPH0311009 B2 JP H0311009B2
- Authority
- JP
- Japan
- Prior art keywords
- objective lens
- frame
- lens
- viscous body
- cylindrical frame
- 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 - Lifetime
Links
- 239000011345 viscous material Substances 0.000 claims description 8
- 230000003287 optical effect Effects 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 2
- 230000002159 abnormal effect Effects 0.000 description 8
- 239000012530 fluid Substances 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 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 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- -1 etc. Substances 0.000 description 1
- 239000012213 gelatinous substance Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0925—Electromechanical actuators for lens positioning
- G11B7/0932—Details of sprung supports
Landscapes
- Automatic Focus Adjustment (AREA)
- Optical Recording Or Reproduction (AREA)
Description
【発明の詳細な説明】
本発明は情報記録媒体に記録された情報を光学
的に読取る装置において、情報記録媒体に形成さ
れた情報トラツクに読取りビームを収束させるた
めの対物レンズの駆動装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an objective lens driving device for converging a reading beam onto an information track formed on an information recording medium in an apparatus for optically reading information recorded on an information recording medium.
従来、この種対物レンズをフオーカス、トラツ
キング、タンジエンシヤルの三方向に駆動する装
置の一例として第１図および第２図で示すような
構造のものがある。この駆動装置は可動コイル
Ａ、円筒状コイル枠Ｂ、ヨークＣとで構成された
フオーカス駆動部Ｄの円筒状コイル枠Ｂと、対物
レンズＥの鏡枠Ｆとの間を２枚の平行な板バネ
G1，G2で連結した構造であつて、対物レンズＥ
は可動コイルＡによつてフオーカス駆動（Ｘ方
向）され、レバーＨによりトラツキング駆動（Ｙ
方向）されるようにしたものである。また板バネ
G1，G2を４本のピアノ線に変えるとタンジエン
シヤル方向の駆動も可能となる。しかし、フオー
カス駆動部Ｄと、対物レンズＥとの間を板バネ
G1，G2ないしはピアノ線のような弾性支持体の
みで連結されているので、該弾性支持体が異常共
振等を発生し、対物レンズＥの位置制御を正確か
つ安定に行わせることが困難であつた。 Conventionally, there is a structure as shown in FIGS. 1 and 2 as an example of a device for driving this type of objective lens in three directions: focusing, tracking, and tangential. This drive device uses two parallel plates between the cylindrical coil frame B of the focus drive unit D, which is composed of a movable coil A, a cylindrical coil frame B, and a yoke C, and the lens frame F of the objective lens E. Spring
The structure is connected by G 1 and G 2 , and the objective lens E
is focus driven (X direction) by moving coil A, and tracking driven (Y direction) by lever H.
direction). Also leaf spring
If G 1 and G 2 are replaced with four piano wires, driving in the tangential direction is also possible. However, a plate spring is connected between the focus drive unit D and the objective lens E.
Since they are connected only by elastic supports such as G 1 and G 2 or piano wire, the elastic supports may generate abnormal resonance, making it difficult to accurately and stably control the position of the objective lens E. It was hot.
そこで上記のような問題点を解消するために、
従来、弾性支持体の異常共振を防止するための手
段として、対物レンズを支持する弾性支持体を粘
性体中に埋設することにより、弾性支持体の異常
共振等を制御して正確で安定した対物レンズの位
置制御を行わせるようにした光学式情報読取装置
における対物レンズ駆動装置が存在した（例え
ば、特開昭51−61726号公報など）。 Therefore, in order to solve the above problems,
Conventionally, as a means to prevent abnormal resonance of the elastic support, an elastic support supporting the objective lens is embedded in a viscous material, thereby controlling abnormal resonance of the elastic support and creating an accurate and stable objective. There has been an objective lens driving device for an optical information reading device that controls the position of a lens (for example, Japanese Patent Laid-Open No. 51-61726).
しかしながら、上記の従来技術においては、対
物レンズを支持するレンズ保持体は、上下端面が
開放された磁性弾性体より形成される箱形状の弾
性枠体の中に粘性体を充填し、この粘性体の中に
レンズ保持体を埋設して構成されているために、
磁性弾性体により形成される弾性枠体の異常共振
等を防止することはある程度可能となるが、この
弾性枠体中の粘性体は、シリコン系のダンパーに
よつて設けられているために高価なものとなると
共に、弾性変形が十分ではない等という問題を有
していた。また、粘性体を流動性のあるオイルや
グリス等やゲル化状物質によつて埋設した場合に
は、対物レンズの駆動力や共振等によつて粘性体
が飛散する原因ともなり、対物レンズを汚してし
まい対物レンズの正確な位置制御を行えないとい
う問題を有していた。 However, in the above-mentioned conventional technology, the lens holder supporting the objective lens is formed by filling a box-shaped elastic frame made of a magnetic elastic material with open upper and lower end surfaces with a viscous material. Because the lens holder is embedded inside the
Although it is possible to some extent to prevent abnormal resonance of the elastic frame formed by a magnetic elastic body, the viscous body in this elastic frame is provided with a silicon damper, which is expensive. However, it also had problems such as insufficient elastic deformation. Furthermore, if the viscous material is buried in fluid oil, grease, etc., or a gelatinous substance, the viscous material may be scattered due to the driving force or resonance of the objective lens, and the objective lens may be damaged. There is a problem in that the objective lens gets dirty and accurate position control of the objective lens cannot be performed.
そこで、本発明は上記のような問題点を解消す
べく、次のように構成したものである。 Therefore, in order to solve the above-mentioned problems, the present invention is constructed as follows.
対物レンズを情報記録面に対して、ほぼ平行に
変位可能に支持する弾性支持体を筒状枠内の粘性
体中に埋設した光学式情報読取装置の対物レンズ
駆動装置において、前記筒状枠内の粘性体中に埋
設した弾性支持体により対物レンズを収納した鏡
枠を支持すると共に、上記筒状枠と鏡枠との間に
上記粘性体が飛散するのを防止するシール部材を
設けたことにより、弾性支持体の異常共振等を制
御すると共に、粘性体の飛散を防止して、正確で
安定した対物レンズの位置制御を行わせるように
した光学式情報読取装置における対物レンズ駆動
装置を提供するのが目的である。 In an objective lens drive device for an optical information reading device, in which an elastic support for displacing the objective lens substantially parallel to the information recording surface is embedded in a viscous material within the cylindrical frame, The lens frame housing the objective lens is supported by an elastic support embedded in the viscous body, and a sealing member is provided between the cylindrical frame and the lens frame to prevent the viscous body from scattering. Provides an objective lens drive device for an optical information reading device that controls abnormal resonance of an elastic support, prevents scattering of viscous material, and performs accurate and stable positional control of the objective lens. The purpose is to.
以下、本発明を図面の実施例に基づいて説明す
ると、第３図は本発明に係る対物レンズ駆動装置
の縦断面図で、第４図は第３図の要部を示す横断
面拡大図で、第６図は同要部の縦断面図を示す。 Hereinafter, the present invention will be explained based on the embodiments shown in the drawings. FIG. 3 is a longitudinal cross-sectional view of the objective lens driving device according to the present invention, and FIG. 4 is an enlarged cross-sectional view showing the main part of FIG. 3. , FIG. 6 shows a longitudinal cross-sectional view of the same essential parts.
上記の図面において、１は対物レンズで鏡枠２
内に収納されている。３はフオーカス駆動手段の
磁気回路でポールヨーク４と、マグネツト５と、
プレート６と、駆動コイル７とで構成されてお
り、駆動コイル７の下端は支持具８に固定され、
ポールヨーク４とプレート６とで形成された磁気
ギヤツプ内に配置されている。 In the above drawing, 1 is the objective lens and the lens frame 2
It is stored inside. 3 is a magnetic circuit of the focus driving means, which includes a pole yoke 4, a magnet 5,
It is composed of a plate 6 and a drive coil 7, and the lower end of the drive coil 7 is fixed to a support 8.
It is arranged in a magnetic gap formed by the pole yoke 4 and the plate 6.
９は筒状枠で、該筒状枠９はポールヨーク４の
内筒部の内径より極く僅かに小径な外径を有する
外筒枠９ａ内に、離間部９ｂを介して内筒枠９ｃ
を配置した構造である。そして、上記の筒状枠９
はポールヨーク４の内筒部内に上下動自在に挿入
されると共に、その下端は前記の支持具８に固定
されている。 Reference numeral 9 denotes a cylindrical frame, and the cylindrical frame 9 is inserted into an outer cylindrical frame 9a having an outer diameter slightly smaller than the inner diameter of the inner cylindrical portion of the pole yoke 4, and an inner cylindrical frame 9c via a spaced part 9b.
It is a structure in which And the above cylindrical frame 9
is inserted into the inner cylindrical portion of the pole yoke 4 so as to be vertically movable, and its lower end is fixed to the support 8 described above.
１０は２枚の板バネ１１ａ，１１ｂを用いた弾
性支持体で、両板バネ１１ａ，１１ｂは平行に難
間して筒状枠９の離間部９ｂ内に非接触状態で挿
入され、その下端は筒状枠９の下端に固定され、
その上端は前記の鏡枠２に固定されている。そし
て、筒状枠９の離間部９ｂ内には、粘性体１２を
充填して該粘性体１２中に弾性支持体である板バ
ネ１１ａ，１１ｂを埋設状態としてある。粘性体
１２にはオイルやグリス等のような流動性のある
ものでも、流動性のないゲル化状物質でもよい。
１３ａ，１３ｂは、鏡枠２の下面と筒状枠９の内
外筒枠９ａ，９ｃの上端との間に設けた蛇腹状の
シール部材で、このシール部材１３ａ，１３ｂ
は、特に流動性のある粘性体１２を充填した場合
に、該粘性体１２が筒状枠９の上端から飛散する
のを防止することができる。また、筒状枠９内の
振動や共振等によつて粘性体１２が飛散して対物
レンズ１等に付着するのを防止している。又、弾
性支持体１０は板バネ１１ａ，１１ｂに限らず、
第５図で示すようにピアノ線状の線状バネ１４で
もよい。 Reference numeral 10 denotes an elastic support using two leaf springs 11a, 11b, both leaf springs 11a, 11b are inserted in a non-contact state into the spaced part 9b of the cylindrical frame 9 in parallel with each other. is fixed to the lower end of the cylindrical frame 9,
Its upper end is fixed to the lens frame 2 mentioned above. A viscous body 12 is filled in the spaced part 9b of the cylindrical frame 9, and plate springs 11a and 11b, which are elastic supports, are embedded in the viscous body 12. The viscous body 12 may be a fluid material such as oil or grease, or a gelled substance without fluidity.
13a, 13b are bellows-shaped seal members provided between the lower surface of the lens frame 2 and the upper ends of the inner and outer cylinder frames 9a, 9c of the cylindrical frame 9;
This can prevent the viscous body 12 from scattering from the upper end of the cylindrical frame 9, especially when the viscous body 12 is filled with fluidity. It also prevents the viscous body 12 from scattering and adhering to the objective lens 1 etc. due to vibrations, resonance, etc. within the cylindrical frame 9. Moreover, the elastic support body 10 is not limited to the leaf springs 11a and 11b,
As shown in FIG. 5, a linear spring 14 in the shape of a piano wire may be used.
１５，１６は夫々鏡枠２の近傍に配置したトラ
ツキング及びタンジエンシヤル駆動用の電磁石で
あるが、ボイスコイル等の電磁手段により駆動力
を付与するようにしてもよい。 Reference numerals 15 and 16 are electromagnets for tracking and tangential drive, respectively, placed near the lens frame 2, but the driving force may be applied by electromagnetic means such as a voice coil.
そこで、磁気回路３の駆動コイル７により発生
した駆動力は、弾性支持体１０を介して対物レン
ズ１に伝達されフオーカスサーボを行い、電磁石
１５，１６により対物レンズ１のトラツキングサ
ーボ及びタンジエンシヤルサーボを行うのであ
る。この際、弾性支持体１０の共振等は粘性体１
２の流動抵抗ないし粘性抵抗により抑制されるた
め、異常共振は生ぜず、正確で安定した対物レン
ズ１の位置制御を行うことができる。 Therefore, the driving force generated by the drive coil 7 of the magnetic circuit 3 is transmitted to the objective lens 1 via the elastic support 10 to perform focus servo, and the electromagnets 15 and 16 perform the tracking servo and tandem shift of the objective lens 1. It performs serial servo. At this time, the resonance etc. of the elastic support body 10 are caused by the viscous body 1
Since this is suppressed by the flow resistance or viscous resistance of No. 2, abnormal resonance does not occur, and accurate and stable position control of the objective lens 1 can be performed.
本発明は叙上のように、対物レンズを情報記録
面に対して、ほぼ平行に変位可能に支持する弾性
支持体を筒状枠内の粘性体中に埋設した光学式情
報読取装置の対物レンズ駆動装置において、前記
筒状枠９内の粘性体１２中に埋設した弾性支持体
１０により対物レンズ１を収納した鏡枠２を支持
すると共に、上記筒状枠９と鏡枠２との間に上記
粘性体１２が飛散するのを防止するシール部材１
３ａ，１３ｂを設けたものである。 As described above, the present invention provides an objective lens for an optical information reading device in which an elastic support for supporting the objective lens so as to be displaceable approximately parallel to the information recording surface is embedded in a viscous material within a cylindrical frame. In the drive device, a lens frame 2 housing an objective lens 1 is supported by an elastic support 10 embedded in a viscous body 12 in the cylindrical frame 9, and a space between the cylindrical frame 9 and the lens frame 2 is provided. Seal member 1 that prevents the viscous body 12 from scattering
3a and 13b are provided.
従つて、弾性支持体１０が異常振動を起こす
と、該振動を粘性体１２が抑制することになり、
対物レンズ１の位置制御が正確かつ安定に行われ
ると共に、粘性体１２の飛散を防止して対物レン
ズ１に粘性体１２が付着するのを防止することが
できる。また、粘性体１２により異常振動を抑制
できるので、対物レンズ１に対するフオーカス、
トラツキング及びタンジエンシヤルの駆動力を別
個に与えることが容易となり、この３軸の駆動手
段の設計が簡単となる。更に、粘性体１２によつ
て対物レンズ１が回転（傾き）を起こさないので
正確に平行移動させることができる。又、トラツ
キング方向及びタンジエンシヤル方向の被駆動体
の重量が大巾に減少するため、その力、変位変換
効率が一段と向上する。 Therefore, when the elastic support 10 causes abnormal vibration, the viscous body 12 suppresses the vibration.
The position of the objective lens 1 can be accurately and stably controlled, and the viscous body 12 can be prevented from scattering and adhering to the objective lens 1. In addition, since abnormal vibrations can be suppressed by the viscous body 12, the focus on the objective lens 1,
It becomes easy to provide tracking and tangential driving forces separately, and the design of this three-axis driving means becomes simple. Furthermore, since the objective lens 1 does not rotate (tilt) due to the viscous body 12, it can be accurately translated in parallel. Further, since the weight of the driven body in the tracking direction and the tangential direction is greatly reduced, the force and displacement conversion efficiency are further improved.
第１図は従来例の対物レンズ駆動装置を示す縦
断面図で、第２図は第１図の−線部分拡大断
面図で、第３図は本発明に係る対物レンズ駆動装
置の縦断面図で、第４図は第３図の要部を示す横
断面拡大図、第５図は第３図と同一部分における
他の実施例の横断面拡大図、第６図は第３図にお
ける対物レンズ駆動装置を示す要部の縦断面図で
ある。
１……対物レンズ、２……鏡枠、３……磁気回
路、７……駆動コイル、９……筒状枠、１０……
弾性支持体、１２……粘性体、１３ａ，１３ｂ…
…シール部材。
FIG. 1 is a vertical sectional view showing a conventional objective lens driving device, FIG. 2 is an enlarged sectional view of the portion taken along the line - in FIG. 1, and FIG. 3 is a vertical sectional view of the objective lens driving device according to the present invention. Fig. 4 is an enlarged cross-sectional view showing the main part of Fig. 3, Fig. 5 is an enlarged cross-sectional view of another embodiment of the same part as Fig. 3, and Fig. 6 is an enlarged cross-sectional view of the same part as Fig. 3. FIG. 3 is a longitudinal cross-sectional view of the main parts of the drive device. DESCRIPTION OF SYMBOLS 1... Objective lens, 2... Lens frame, 3... Magnetic circuit, 7... Drive coil, 9... Cylindrical frame, 10...
Elastic support, 12... Viscous body, 13a, 13b...
...Seal member.
Claims (1)
に変位可能に支持する弾性支持体を筒状枠内の粘
性体中に埋設した光学式情報読取装置の対物レン
ズ駆動装置において、 前記筒状枠９内の粘性体１２中に埋設した弾性
支持体１０により対物レンズ１を収納した鏡枠２
を支持すると共に、上記筒状枠９と鏡枠２との間
に上記粘性体１２が飛散するのを防止するシール
部材１３ａ，１３ｂを設けたことを特徴とする光
学式情報読取装置における対物レンズ駆動装置。[Scope of Claims] 1. An objective lens drive device for an optical information reading device, in which an elastic support for displacing the objective lens substantially parallel to the information recording surface is embedded in a viscous material within a cylindrical frame. In the lens frame 2, the objective lens 1 is housed by an elastic support 10 embedded in a viscous body 12 in the cylindrical frame 9.
An objective lens in an optical information reading device characterized in that sealing members 13a and 13b are provided between the cylindrical frame 9 and the lens frame 2 to support the viscous body 12 and prevent the viscous body 12 from scattering. Drive device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14976481A JPS5850631A (en) | 1981-09-21 | 1981-09-21 | Driving device for objective lens in optical information reader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14976481A JPS5850631A (en) | 1981-09-21 | 1981-09-21 | Driving device for objective lens in optical information reader |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5850631A JPS5850631A (en) | 1983-03-25 |
| JPH0311009B2 true JPH0311009B2 (en) | 1991-02-15 |
Family
ID=15482221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14976481A Granted JPS5850631A (en) | 1981-09-21 | 1981-09-21 | Driving device for objective lens in optical information reader |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5850631A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6121019U (en) * | 1984-07-11 | 1986-02-06 | アルプス電気株式会社 | Objective lens drive device |
| JP2611966B2 (en) * | 1985-05-13 | 1997-05-21 | 株式会社東芝 | Objective lens drive |
| JPS623623U (en) * | 1985-06-20 | 1987-01-10 | ||
| JP2791316B2 (en) * | 1996-10-29 | 1998-08-27 | 株式会社東芝 | Objective lens drive |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5161726A (en) * | 1974-11-27 | 1976-05-28 | Nippon Musical Instruments Mfg |
-
1981
- 1981-09-21 JP JP14976481A patent/JPS5850631A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5161726A (en) * | 1974-11-27 | 1976-05-28 | Nippon Musical Instruments Mfg |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5850631A (en) | 1983-03-25 |
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