JPH0395729A - Objective lens inclination adjusting mechanism - Google Patents

Objective lens inclination adjusting mechanism

Info

Publication number
JPH0395729A
JPH0395729A JP23124089A JP23124089A JPH0395729A JP H0395729 A JPH0395729 A JP H0395729A JP 23124089 A JP23124089 A JP 23124089A JP 23124089 A JP23124089 A JP 23124089A JP H0395729 A JPH0395729 A JP H0395729A
Authority
JP
Japan
Prior art keywords
objective lens
spherical seat
actuator
actuator housing
optical axis
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
Application number
JP23124089A
Other languages
Japanese (ja)
Inventor
Susumu Katagiri
進 片桐
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP23124089A priority Critical patent/JPH0395729A/en
Publication of JPH0395729A publication Critical patent/JPH0395729A/en
Pending legal-status Critical Current

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  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)

Abstract

PURPOSE:To improve supporting force for the supporting part of an elastic supporting member by arranging the supporting part on an actuator housing side, spherical seat and contact part between this spherical seat and an actuator fitting stand on the same straight line parallel with the optical axial direction of an objective lens. CONSTITUTION:An actuator housing 11 is fixed to an actuator fitting stand 14 by a screw 16 and a spherical seat 15 is provided. Then, the actuator housing 11 and the actuator fitting stand 14 are abutted. In such constitution, a supporting part A on the actuator housing 11 side of leaf springs 8a and 8b, the spherical seat 15 and a contact part B between this spherical seat 15 and the actuator fitting stand 14 are arranged on the same straight line parallel with an optical axial direction of an objective lens 2. Thus, in comparison with a case that the spherical seat 15 is provided in a position separated from the leaf spring 8b, crimping force can be made much stronger to be generated between the actuator housing 11 and the leaf spring 8b.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、光情報記録再生装置の対物レンズ傾き調整機
構に関する。
DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an objective lens tilt adjustment mechanism for an optical information recording/reproducing device.

従来の技術 従来における光情報記録再生装置は、第5図に示すよう
に、図示しない半導体レーザから出射された光を図示し
ないコリメートレンズにより平行化した後、偏向プリズ
ム1を介してその出射光の光路を偏向し、対物レンズ2
により集光して光スポットを形成しこれを光情報記録媒
体としての光ディスク3に照射することにより、情報の
高密度な記録や、再生等を行っている。この場合、所定
の径を有する光スポットを光ディスクの面上に照射する
ためには、光スポットの焦点合わせが必要であるが、こ
のためには、通常、対物レンズを光軸方向に移動調整す
る対物レンズアクチュエータ機構によって行う。対物レ
ンズの光軸は入射光に対して傾いているとコマ収差等が
発生するので、アクチュエータ機構の傾きの調整を行っ
ている。
2. Description of the Related Art As shown in FIG. 5, a conventional optical information recording/reproducing apparatus collimates light emitted from a semiconductor laser (not shown) using a collimating lens (not shown), and then converts the emitted light through a deflection prism 1. Deflect the optical path and use objective lens 2
By condensing the light to form a light spot and irradiating it onto the optical disc 3 as an optical information recording medium, information is recorded and reproduced at high density. In this case, in order to irradiate a light spot with a predetermined diameter onto the surface of the optical disk, it is necessary to focus the light spot, but for this purpose, the objective lens is usually moved and adjusted in the optical axis direction. This is done by an objective lens actuator mechanism. If the optical axis of the objective lens is tilted with respect to the incident light, coma aberration etc. will occur, so the tilt of the actuator mechanism is adjusted.

そこで、従来における対物レンズアクチュエータの構或
を上述した第5図に基づいて説明する。
Therefore, the structure of a conventional objective lens actuator will be explained based on FIG. 5 mentioned above.

対物レンズ2はレンズセル2Lに保持されており、その
レンズセル2L、ボビン4、コイル5、板バネ押え6か
らなる可動部7は、弾性支持部材としての上下2枚から
なる板バネ8a,8bにより支持されている。上側の板
バネ8aは外輪9とカバー10とによって固定され、下
側の板バネ8bは外輪9とアクチュエータハウジング1
■とによって固定されている。
The objective lens 2 is held by a lens cell 2L, and a movable part 7 consisting of the lens cell 2L, a bobbin 4, a coil 5, and a leaf spring retainer 6 is supported by two upper and lower leaf springs 8a and 8b as elastic supporting members. Supported by The upper leaf spring 8a is fixed by the outer ring 9 and the cover 10, and the lower leaf spring 8b is fixed by the outer ring 9 and the actuator housing 1.
■It is fixed by and.

この場合、可動部7側に取付けられたコイル5と、外輪
9側に取付けられた永久磁石l2、ヨークl 3 a,
  1 3 bより磁気回路を構成しており、コイル5
に電流を流すことによって、対物レンズ2を光軸方向■
に移動できるようになっている。
In this case, the coil 5 attached to the movable part 7 side, the permanent magnet l2 attached to the outer ring 9 side, the yoke l3a,
1 3 b constitutes a magnetic circuit, and the coil 5
By passing a current through, the objective lens 2 is moved in the optical axis direction.
It is now possible to move to.

発明が解決しようとする課題 上述したような対物レンズアクチュエータにおける対物
レンズ2の光軸2aは、光ディスク3の面に対して垂直
でなければならない。その理由は、光ディスク3の面に
より反射された光がその入射光にずれてしまい、これに
より、光ピックアップ光学系内に設けられた図示しない
受光素子面上において光スポットが正常な位置から移動
したり、光強度分布が非対称となったりして、その結果
、フォーカスエラー信号やトラックエラー信号の検出を
正常に行うことができなくなるからである。
Problems to be Solved by the Invention The optical axis 2a of the objective lens 2 in the objective lens actuator as described above must be perpendicular to the surface of the optical disc 3. The reason for this is that the light reflected by the surface of the optical disc 3 is shifted from the incident light, and as a result, the light spot moves from its normal position on the surface of a light receiving element (not shown) provided in the optical pickup optical system. This is because the light intensity distribution may become asymmetrical, and as a result, it becomes impossible to normally detect a focus error signal or a tracking error signal.

そこで、従来において、対物レンズ2の光軸からのズレ
をなくすために、アクチュエータハウジング11のアク
チュエータ取付台14と接する側の面に球面状をなす球
面座l5を設け、アクチュ工一タハウジング1lとアク
チュエータ取付台14とを固定するねじ16の締め付け
力を調整して球面座15を微動させ、これにより対物レ
ンズ2の傾きの調整を行って光軸2aからのズレをなく
すようにしている。
Therefore, conventionally, in order to eliminate the deviation of the objective lens 2 from the optical axis, a spherical seat l5 having a spherical shape is provided on the surface of the actuator housing 11 that contacts the actuator mounting base 14, and the actuator housing 1l and The spherical seat 15 is slightly moved by adjusting the tightening force of the screw 16 that fixes it to the actuator mount 14, thereby adjusting the inclination of the objective lens 2 to eliminate deviation from the optical axis 2a.

しかし、従来における球面座l5は、外輪9に対して離
縁した位置に設けられているため、第6図に示すように
、アクチュエータ取付台l4より受ける応力Mに押圧さ
れ、アクチュエータハウジング11は破線で示したよう
にひずんでしまい、その結果、板バネ8bの支持剛性が
弱くなる。すなわち、アクチュエータハウジング■1が
破線のようにひずむために、隙間l7が発生して板バネ
8bの支持が不安定となる。しかも、外輪9も不安定に
なり上側の板バネ8aの支持剛性も弱くなり板バネ8b
の振動特性が不安定となり、第4図に示すような高次共
振が発生してしまい、その結果、安定した振動特性を得
ることができなくなってしまうという問題が生じる。
However, since the conventional spherical seat l5 is provided at a position distant from the outer ring 9, as shown in FIG. 6, it is pressed by the stress M received from the actuator mounting base l4, and the actuator housing 11 is As shown, it is distorted, and as a result, the support rigidity of the leaf spring 8b is weakened. That is, since the actuator housing (1) is distorted as shown by the broken line, a gap (17) is generated and the support of the leaf spring (8b) becomes unstable. Moreover, the outer ring 9 also becomes unstable, and the support rigidity of the upper leaf spring 8a becomes weaker, causing the leaf spring 8b to become unstable.
The vibration characteristics become unstable, and high-order resonance as shown in FIG. 4 occurs, resulting in a problem that stable vibration characteristics cannot be obtained.

課題を解決するための手段 そこで、このような問題点を解決するために、本発明は
、対物レンズを保持する可動体を弾性支持部材を介して
アクチュエータハウジングにより支持し、球面座の形成
された前記アクチュエータハウジングをその球面座と接
した状態でアクチュ工一夕取付台に取付け、前記対物レ
ンズの光軸が光情報記録媒体に対して垂直となるように
調整する光情報記録再生装置の対物レンズ傾き調整機構
において、前記弾性支持部材の前記アクチュエータハウ
ジング側の支持部と、前記球面座と、この球面座と前記
アクチュエータ取付台との接触部とを、前記対物レンズ
の光軸方向と平行な同一直線上に配列した。
Means for Solving the Problems Therefore, in order to solve such problems, the present invention supports a movable body that holds an objective lens by an actuator housing via an elastic support member, and has a movable body formed with a spherical seat. An objective lens for an optical information recording/reproducing device, wherein the actuator housing is attached to an actuator mounting base in contact with the spherical seat thereof, and the optical axis of the objective lens is adjusted to be perpendicular to an optical information recording medium. In the tilt adjustment mechanism, a support portion of the elastic support member on the actuator housing side, the spherical seat, and a contact portion between the spherical seat and the actuator mounting base are arranged in the same direction parallel to the optical axis direction of the objective lens. Arranged in a straight line.

作用 これにより、アクチュエータハウジングをアクチュエー
タ取付台に取付ける際に発生する応力は、球面座を押圧
し、さらには、その球面座の真上に位置する弾性支持部
材を押圧することになるため、従来のように球面座と弾
性支持部材とが離れた位置関係にある時に比べ、対物レ
ンズを保持する弾性支持部材の支持部の支持力を一段と
向上させる二とができる。
Effect: As a result, the stress generated when the actuator housing is attached to the actuator mounting base presses the spherical seat and further presses the elastic support member located directly above the spherical seat. In this way, the supporting force of the support portion of the elastic support member that holds the objective lens can be further improved compared to when the spherical seat and the elastic support member are in a distant positional relationship.

実施例 本発明の一実施例を第1図ないし第3図に基づいて説明
する。なお、従来技術と同一部分については同一符号を
用いる。
Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 3. Note that the same reference numerals are used for the same parts as in the prior art.

対物レンズアクチュエー夕の構成を第l図に基づいて述
べる。図示しない半導体レーザから出射れた光は、偏向
プリズム1によりその先路を変えられ上方に向かって進
行していき、対物レンズ2により集光されて光スポット
を形成した状態となり光ディスク3の面上に照射され、
これにより情報の記録、再生等が行われる。
The configuration of the objective lens actuator will be described based on FIG. Light emitted from a semiconductor laser (not shown) is diverted by a deflection prism 1 and travels upward, and is focused by an objective lens 2 to form a light spot on the surface of an optical disc 3. irradiated with
This allows information to be recorded, reproduced, etc.

可動部7は、対物レンズ2、レンズセル2L、ボビン4
、コイル5、板バネ押え6によりなっている。この可動
部7は、上下2枚からなる弾性支持部材としての板バネ
8a,8bにより弾性支持されており、上側の板バネ8
aは外輪9とカバー10との間に発生するネジ18の締
め付け力により固定され、下側の板バネ8bは外輪9と
アクチュエータハウジング11との間に発生するネジ1
8の締め付け力により固定されている。
The movable part 7 includes an objective lens 2, a lens cell 2L, and a bobbin 4.
, a coil 5, and a plate spring retainer 6. This movable part 7 is elastically supported by leaf springs 8a and 8b as elastic support members consisting of two upper and lower members, and the upper leaf spring 8
a is fixed by the tightening force of the screw 18 generated between the outer ring 9 and the cover 10, and the lower plate spring 8b is fixed by the tightening force of the screw 18 generated between the outer ring 9 and the actuator housing 11.
It is fixed with a tightening force of 8.

また、このアクチュエータハウジングl1は、ネジ16
によりアクチュエータ取付台l4に固定されている。そ
のアクチュエータハウジング1lには球面座15が設け
られており、この球面座15によりアクチュエータハウ
ジング11とアクチュエータ取付台l4とは当接した形
となっている。
Moreover, this actuator housing l1 has screws 16
is fixed to the actuator mounting base l4. The actuator housing 1l is provided with a spherical seat 15, and the spherical seat 15 allows the actuator housing 11 and the actuator mounting base l4 to come into contact with each other.

このような構成において、板バネ8a,8bのアクチュ
エータハウジング11側の支持部Aと、球面座l5と、
この球面座↓5とアクチュエータ取付台14との接触部
Bとは、対物レンズ2の光軸方向■と平行な同一直線上
に配列された形となっている。このため、ネジl6の締
め付け力は球面座15の接触部Bで発生し、その球面座
l5はアクチュエータ取付台14により押圧されること
となり、これに伴い、その球面座15の真上に位置する
板ハネ8bも強固に押圧されることになる。
In such a configuration, the support part A of the plate springs 8a and 8b on the actuator housing 11 side, the spherical seat l5,
The contact portion B between the spherical seat ↓ 5 and the actuator mounting base 14 is arranged on the same straight line parallel to the optical axis direction (■) of the objective lens 2. Therefore, the tightening force of the screw l6 is generated at the contact part B of the spherical seat 15, and the spherical seat l5 is pressed by the actuator mounting base 14, and accordingly, the spherical seat l5 is located directly above the spherical seat 15. The plate spring 8b is also firmly pressed.

このように球面座l5と板バネ8a,8bの支持部Aと
を光軸2aと平行な同一直線上に位置させる二とによっ
て、従来のように(第5図参照)球面座15が板ハネ8
bと離れた位置に設けられていた時に比べ、アクチュエ
ータハウジング11と板バネ8bとの間に発生する扶持
力をより一層強くすることができる。
By locating the spherical seat 15 and the support portions A of the leaf springs 8a and 8b on the same straight line parallel to the optical axis 2a, the spherical seat 15 can be attached to the leaf spring as in the conventional method (see FIG. 5). 8
The supporting force generated between the actuator housing 11 and the plate spring 8b can be made even stronger than when the actuator housing 11 and the plate spring 8b are provided at a position apart from the actuator housing 11 and the plate spring 8b.

従って、このように板バネ8a,8bが強固に固定され
た状態における振動周波数の特性を調べると、第3図に
示すように、通常問題となる領域20KHzまで高次共
振の発生しない良好な振動特性を得ることが可能となり
、これにより信頼性の高い対物レンズアクチュエー夕を
得ることができる。
Therefore, when examining the vibration frequency characteristics in a state where the leaf springs 8a and 8b are firmly fixed in this way, as shown in Fig. 3, good vibrations with no high-order resonance occurring up to 20 KHz, the region that usually causes problems, are found. This makes it possible to obtain a highly reliable objective lens actuator.

発明の効果 本発明は、弾性支持部材のアクチュエータハウジング側
の支持部と、球面座と、この球面座とアクチュエータ取
付台との接触部とを、対物レンズの光軸方向と平行な同
一直線上に配列したので、アクチュエータハウジングを
アクチュエータ取付台に取付ける際に発生する応力は、
球面座を押圧し、さらには、その球面座の真上に位置す
る弾性支持部材を押圧することになるため、従来のよう
に球面座と弾性支持部材とが離れた位置関係にある時に
比べ、対物レンズを保持する弾性支持部材の支持部の支
持力を一段と向上させることができ、これにより、従来
のような高次共振の発生しない安定した振動特性を得る
対物レンズアクチュエータを得ることができるものであ
る。
Effects of the Invention The present invention makes the support portion of the elastic support member on the actuator housing side, the spherical seat, and the contact portion between the spherical seat and the actuator mounting base on the same straight line parallel to the optical axis direction of the objective lens. The stress generated when attaching the actuator housing to the actuator mounting base is
Since the spherical seat is pressed and the elastic support member located directly above the spherical seat is also pressed, compared to the conventional case where the spherical seat and the elastic support member are separated from each other, The supporting force of the support part of the elastic support member that holds the objective lens can be further improved, thereby making it possible to obtain an objective lens actuator that obtains stable vibration characteristics that do not generate high-order resonance as in the past. It is.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の一実施例を示す縦断側面図、第2図は
それを対物レンズ側からみた平面図、第3図は本発明の
構成により得られる振動特性、第4図は従来の構成によ
り得られる振動特性、第5図は従来例を示す縦断側面図
、第6図は球面座に加わる応力の様子を示す説明図であ
る。 2・・・偏向プリズム、3・・・光情報記録媒体、7可
動体、8a,8b・・・弾性支持部材、{1・・・アク
チュエータハウジング、14・・・アクチュエータ取付
台、15・・・球面座、A・・支持部、B・・・接触部
出 願 人    株式会社 リ コ 1,,3逸 3 L4−図 周巌扱一 ;}
Fig. 1 is a vertical sectional side view showing an embodiment of the present invention, Fig. 2 is a plan view of the same as seen from the objective lens side, Fig. 3 is a vibration characteristic obtained by the configuration of the present invention, and Fig. 4 is a conventional one. FIG. 5 is a longitudinal cross-sectional side view showing a conventional example, and FIG. 6 is an explanatory diagram showing the state of stress applied to the spherical seat. 2... Deflection prism, 3... Optical information recording medium, 7 Movable body, 8a, 8b... Elastic support member, {1... Actuator housing, 14... Actuator mounting base, 15... Spherical seat, A...Support part, B...Contact part Applicant Rico Co., Ltd. 1, 3 L4-Fig.

Claims (1)

【特許請求の範囲】[Claims]  対物レンズを保持する可動体を弾性支持部材を介して
アクチュエータハウジングにより支持し、球面座の形成
された前記アクチュエータハウジングをその球面座と接
した状態でアクチュエータ取付台に取付け、前記対物レ
ンズの光軸が光情報記録媒体に対して垂直となるように
調整する光情報記録再生装置の対物レンズ傾き調整機構
において、前記弾性支持部材の前記アクチュエータハウ
ジング側の支持部と、前記球面座と、この球面座と前記
アクチュエータ取付台との接触部とを、前記対物レンズ
の光軸方向と平行な同一直線上に配列したことを特徴と
する対物レンズ傾き調整機構。
A movable body that holds an objective lens is supported by an actuator housing via an elastic support member, the actuator housing in which a spherical seat is formed is attached to an actuator mount in a state in contact with the spherical seat, and the optical axis of the objective lens is In the objective lens tilt adjustment mechanism of an optical information recording/reproducing apparatus, the objective lens tilt adjustment mechanism is configured to adjust the tilt of the objective lens so that the angle is perpendicular to the optical information recording medium. and a contact portion with the actuator mount are arranged on the same straight line parallel to the optical axis direction of the objective lens.
JP23124089A 1989-09-06 1989-09-06 Objective lens inclination adjusting mechanism Pending JPH0395729A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23124089A JPH0395729A (en) 1989-09-06 1989-09-06 Objective lens inclination adjusting mechanism

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23124089A JPH0395729A (en) 1989-09-06 1989-09-06 Objective lens inclination adjusting mechanism

Publications (1)

Publication Number Publication Date
JPH0395729A true JPH0395729A (en) 1991-04-22

Family

ID=16920518

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23124089A Pending JPH0395729A (en) 1989-09-06 1989-09-06 Objective lens inclination adjusting mechanism

Country Status (1)

Country Link
JP (1) JPH0395729A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5617403A (en) * 1994-06-21 1997-04-01 Sony Corporation Optical pickup

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5617403A (en) * 1994-06-21 1997-04-01 Sony Corporation Optical pickup
US5815483A (en) * 1994-06-21 1998-09-29 Sony Corporation Optical pickup

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