JPS6212570B2 - - Google Patents
Info
- Publication number
- JPS6212570B2 JPS6212570B2 JP9624981A JP9624981A JPS6212570B2 JP S6212570 B2 JPS6212570 B2 JP S6212570B2 JP 9624981 A JP9624981 A JP 9624981A JP 9624981 A JP9624981 A JP 9624981A JP S6212570 B2 JPS6212570 B2 JP S6212570B2
- Authority
- JP
- Japan
- Prior art keywords
- objective lens
- lens holding
- coil
- holding cylinder
- yoke
- 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
Links
- 230000007246 mechanism Effects 0.000 claims description 7
- 230000007935 neutral effect Effects 0.000 claims description 7
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 6
- 238000003780 insertion Methods 0.000 description 5
- 230000037431 insertion Effects 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 4
- 230000004907 flux Effects 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 229910000737 Duralumin Inorganic materials 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 229930182556 Polyacetal Natural products 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 239000000758 substrate 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
Description
【発明の詳細な説明】
本発明は光学式デイスクプレーヤに使用される
対物レンズ装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an objective lens device used in an optical disc player.
光学式デイスクプレーヤにおいて使用される対
物レンズ装置には、フオーカス方向（対物レンズ
の光軸方向）及びトラツキング方向（デイスク上
のトラツクの巾方向）の夫々の調整を行うため、
対物レンズを保持する対物レンズ保持筒をスラス
ト方向及びラジアル方向に移動可能にしたものが
知られている。即ち、対物レンズを対物レンズ保
持筒の中心軸から偏心して取り付け、対物レンズ
保持筒の回動によりトラツキング調整が行われ、
スラスト方向の移動によりフオーカス調整が行わ
れるように構成されている。ところで、このよう
な対物レンズ装置は対物レンズ保持筒の外周部に
フオーカス調整用の第１のコイルと、トラツキン
グ調整用の第２のコイルとが設けられている。ま
た、対物レンズ保持筒の内外には一対のヨーク部
が配置され、第１のコイルによつてリニアモータ
が構成され、第２のコイルによつて回動モータが
構成される。そして、対物レンズ保持筒にはこれ
を弾性的に支持してスラスト方向及びラジアル方
向の中立点を保持する中立点保持機構が設けられ
ている。この中立点保持機構には例えば金属バネ
等を用いたものがあるが、一般的に構造が複雑で
あつて組立性が悪く、またスペースフアクタ的に
も問題がある。 The objective lens device used in an optical disk player has a mechanism for adjusting the focus direction (the optical axis direction of the objective lens) and the tracking direction (the width direction of the track on the disk).
It is known that an objective lens holding cylinder that holds an objective lens is movable in the thrust direction and the radial direction. That is, the objective lens is mounted eccentrically from the central axis of the objective lens holding tube, and tracking adjustment is performed by rotating the objective lens holding tube.
The focus adjustment is performed by movement in the thrust direction. Incidentally, in such an objective lens device, a first coil for focus adjustment and a second coil for tracking adjustment are provided on the outer periphery of the objective lens holding cylinder. Further, a pair of yoke portions are arranged inside and outside the objective lens holding cylinder, the first coil constitutes a linear motor, and the second coil constitutes a rotation motor. The objective lens holding cylinder is provided with a neutral point holding mechanism that elastically supports the objective lens holding cylinder and holds neutral points in the thrust direction and the radial direction. Some neutral point holding mechanisms use, for example, metal springs, but they generally have a complicated structure, are difficult to assemble, and also have problems in terms of space factor.
本発明は上述の如き欠陥を是正すべく創案する
に至つたものであつて、対物レンズ保持筒の内外
に設けられたヨーク部に切欠部を設け、対物レン
ズ保持筒の内側の切欠部内に中立点保持機構を配
置することにより対物レンズ装置をコンパクトに
構成できるようにしたものである。 The present invention has been devised to correct the above-mentioned defects, and the present invention is to provide a notch in the yoke portion provided inside and outside the objective lens holding tube, and to provide a neutral portion within the notch inside the objective lens holding tube. By arranging a point holding mechanism, the objective lens device can be constructed compactly.
以下本発明の一実施例を図面に基づいて説明す
る。 An embodiment of the present invention will be described below based on the drawings.
第１図は本発明に係る対物レンズ装置１の組立
斜視図であつて、円形状をした台板２上の中央部
には受け台部３が形成されている。また、この受
け台部３の左右両側には扇形（中心角がほぼ直角
である）をした一対の第１のヨーク部４，５が設
けられ、これら受け台部３及び第１のヨーク部
４，５は台板２と共に磁性材料によつて一体形成
されている。従つて、受け台部３の前後両側に第
１のヨーク部４と５に挾まれた一対の第１の切欠
部６，７が形成される。そして、台板２には第４
図に示すように上記一対の第１の切欠部６，７の
うちいずれか一方の第１の切欠部６と連通する扇
形の光窓１４が設けられ、この光窓１４にレーザ
ー光線を通すようにされている。 FIG. 1 is an assembled perspective view of an objective lens device 1 according to the present invention, in which a pedestal portion 3 is formed at the center of a circular base plate 2. As shown in FIG. Further, a pair of fan-shaped first yoke parts 4 and 5 (with a center angle approximately at a right angle) are provided on the left and right sides of this pedestal part 3, and these pedestal part 3 and first yoke part 4 , 5 are integrally formed with the base plate 2 from a magnetic material. Therefore, a pair of first notches 6 and 7 sandwiched between the first yoke parts 4 and 5 are formed on both the front and rear sides of the pedestal part 3. And on the base plate 2 there is a fourth
As shown in the figure, a fan-shaped optical window 14 is provided which communicates with one of the pair of first notches 6 and 7, and a laser beam is passed through the optical window 14. has been done.
第１のヨーク部４，５は、その高さが上記受け
台部３のそれよりも高くされ、第１のヨーク部４
と５は互いに対向する一対の内側面１６，１７を
有する。内側面１６，１７は互いに平行とされ、
それぞれの内側面１６，１７には第１図、第３図
及び第４図に示すように、ポリウレタン等によつ
て略Ｕ字状に形成された弾性支持板１０の左右両
端部１１，１２が接着されている。この弾性支持
板１０の屈曲部１３は、台板２と平行にしてその
外周部方向へ延出し、屈曲部１３には支持孔１８
が垂直方向に設けられている。 The height of the first yoke parts 4 and 5 is higher than that of the pedestal part 3, and the first yoke part 4
and 5 have a pair of inner surfaces 16, 17 facing each other. The inner surfaces 16 and 17 are parallel to each other,
As shown in FIGS. 1, 3, and 4, the left and right end portions 11, 12 of an elastic support plate 10 formed of polyurethane or the like in a substantially U-shape are provided on the inner surfaces 16, 17, respectively. It is glued. The bent portion 13 of the elastic support plate 10 is parallel to the base plate 2 and extends toward its outer circumference, and the bent portion 13 has support holes 18.
are arranged vertically.
受け台部３の中央部には、第３図に示すように
固定用孔８が垂直に設けられており、この孔８に
金属性の細い支軸９の下端部が挿入されて垂直状
に固定されている。そして、この支軸９に対物レ
ンズ保持筒１９の軸受２０を回動可能でかつスラ
スト方向に摺動可能に挿入するようにされてい
る。即ち、対物レンズ保持筒１９は上記第１のヨ
ーク部４，５の外周に嵌合可能な円筒状とされ、
その上端部は端板部２１で覆われている。端板部
２１上にはその直径方向に沿つて突起部２２が一
体的に形成され、この突起部２２の中央部（対物
レンズ保持筒１９の軸心部と一致する）には端板
部２１側へ垂直に貫通した軸受固定用孔２３が設
けられている。そして、この固定用孔２３に上記
軸受２０の上端部が挿入されて固定されている。
また、突起部２２の一端部には端板部２１の裏側
から支持ピン２６の上端部が垂直に差し込まれ、
この支持ピン２６の下端部は上記弾性支持板１０
の支持孔１８に挿入されて固定されている。なお
この際、支持ピン２６の下端部には予め接着剤を
塗布しておき、対物レンズ保持筒１９の軸受２０
と支持ピン２６を支軸９と支持孔１８に同時に挿
入するようにする。なお、上記軸受２０はナイロ
ンやポリアセタール等の自己潤滑性を有する合成
樹脂か、あるいはセラミツク等によつて成形す
る。また、対物レンズ保持筒１９の材質としては
比重が小さいアルミニウムやジユラルミンを使用
してもよいが、渦電流損の発生を防止するために
は合成樹脂やセラミツク等の非金属材料を使用す
るのが好ましい。 As shown in FIG. 3, a fixing hole 8 is vertically provided in the center of the pedestal part 3, and the lower end of a thin metal support shaft 9 is inserted into this hole 8 so as to be vertically mounted. Fixed. A bearing 20 of the objective lens holding cylinder 19 is inserted into this support shaft 9 so as to be rotatable and slidable in the thrust direction. That is, the objective lens holding cylinder 19 has a cylindrical shape that can be fitted onto the outer periphery of the first yoke parts 4 and 5,
Its upper end portion is covered with an end plate portion 21. A protrusion 22 is integrally formed on the end plate 21 along its diametrical direction, and the end plate 21 is formed at the center of the protrusion 22 (coinciding with the axis of the objective lens holding cylinder 19). A bearing fixing hole 23 is provided that penetrates vertically to the side. The upper end of the bearing 20 is inserted into this fixing hole 23 and fixed.
Further, the upper end of the support pin 26 is vertically inserted into one end of the protrusion 22 from the back side of the end plate 21.
The lower end of this support pin 26 is attached to the elastic support plate 10.
is inserted into the support hole 18 and fixed. At this time, adhesive is applied to the lower end of the support pin 26 in advance, and the bearing 20 of the objective lens holding cylinder 19 is
and the support pin 26 is inserted into the support shaft 9 and the support hole 18 at the same time. The bearing 20 is molded from a self-lubricating synthetic resin such as nylon or polyacetal, or ceramic. Additionally, aluminum or duralumin, which have a low specific gravity, may be used as the material for the objective lens holding tube 19, but in order to prevent the occurrence of eddy current loss, it is recommended to use non-metallic materials such as synthetic resin or ceramics. preferable.
上記突起部２２の他端部には、第１図及び第３
図に示すように端板部２１側へ貫通したレンズ孔
２７が垂直に設けられている。そして、対物レン
ズ２８が嵌め込まれたレンズ枠２９をこのレンズ
孔２７に挿入して取り付けるようにされている。
従つて、対物レンズ２８の真下には上記光窓１４
が位置され、光窓１４から対物レンズ保持筒１９
内に導入されたレーザ光線が上記第１の切欠部６
を通つて対物レンズ２８に導かれるようにされて
いる。 At the other end of the protrusion 22, there is a
As shown in the figure, a lens hole 27 penetrating toward the end plate portion 21 is provided vertically. A lens frame 29 into which the objective lens 28 is fitted is inserted into the lens hole 27 and attached.
Therefore, the optical window 14 is located directly below the objective lens 28.
is located, and the objective lens holding cylinder 19 is
The laser beam introduced into the first notch 6
The light is guided to the objective lens 28 through the.
対物レンズ保持筒１９の外周面には、第１図に
示すようにその周方向に沿つてフオーカス調整用
の第１のコイル３２が巻き付けられて接着されて
いる。また、この第１のコイル３２の表面には方
形に巻かれたトラツキング調整用の第２のコイル
３３〜３６が重ねて接着されている。これら第２
のコイル３３〜３６は対物レンズ保持筒１９の軸
心に対して互いに90゜の角度差をなすように取り
付けられ、かつ夫々の第２のコイル３３〜３６の
中央部における法線が上記突起部２２の長手方向
と45゜の角度差をなすようにされている。また、
第２のコイル３３〜３６の夫々の往路部ａと復路
部ｂは対物レンズ保持筒１９の軸心と平行にされ
ている。 As shown in FIG. 1, a first coil 32 for focus adjustment is wound around and adhered to the outer peripheral surface of the objective lens holding cylinder 19 along its circumferential direction. Further, on the surface of the first coil 32, second coils 33 to 36 for tracking adjustment wound in a rectangular shape are overlapped and bonded. These second
The coils 33 to 36 are attached so as to form an angular difference of 90 degrees from each other with respect to the axis of the objective lens holding cylinder 19, and the normal line at the center of each of the second coils 33 to 36 is aligned with the projection. It is made to form an angular difference of 45 degrees from the longitudinal direction of 22. Also,
The forward path portion a and the backward path portion b of each of the second coils 33 to 36 are parallel to the axis of the objective lens holding cylinder 19.
台板２上の外周部には、第１図〜第３図に示す
ようにリング状のマグネツト４０が取り付けられ
ている。そして、このマグネツト４０の上側面に
は一対の第２のヨーク部４１，４２が取り付けら
れている。この第２のヨーク部４１，４２はリン
グ状のヨーク取付部４３上に一体的に設けられ、
夫々の第２のヨーク部４１，４２はヨーク取付部
４３の４分の１円周の長さに形成されかつ互いに
対向して配置されている。従つて、第２のヨーク
部４１と４２との間には第２の切欠部４４と４５
が形成される。これら第２のヨーク部４１，４２
と第２の切欠部４４，４５は、第４図に示すよう
に対物レンズ保持筒１９を挾んで第１のヨーク部
４，５と第１の切欠部６，７に夫々対向するよう
に取付けられている。即ち、第１のコイル３２及
び第２のコイル３３〜３６の往路部ａが第１のヨ
ーク部４，５と第２のヨーク部４１，４２とによ
つて挾まれている。そして第１のコイル３２、第
１のヨーク部４，５及び第２のヨーク部４１，４
２によつて対物レンズ保持筒１９をスラスト方向
に駆動するリニアモータが構成され、第２のコイ
ル３３〜３６、第１のヨーク部４，５及び第２の
ヨーク部４１，４２によつて対物レンズ保持筒１
９をラジアル方向に駆動する回動モータが構成さ
れる。また、第１の切欠部６，７と第２の切欠部
４４，４５が第２のコイル３３〜３６の復路部ｂ
と対向されて配置される。 A ring-shaped magnet 40 is attached to the outer periphery of the base plate 2, as shown in FIGS. 1 to 3. A pair of second yoke parts 41 and 42 are attached to the upper side of the magnet 40. The second yoke parts 41 and 42 are integrally provided on a ring-shaped yoke attachment part 43,
The second yoke parts 41 and 42 are each formed to have a length equal to one-fourth of the circumference of the yoke attachment part 43, and are arranged to face each other. Therefore, there are second notches 44 and 45 between the second yoke parts 41 and 42.
is formed. These second yoke parts 41, 42
and second notches 44, 45 are attached to face the first yoke parts 4, 5 and the first notches 6, 7, respectively, with the objective lens holding cylinder 19 in between, as shown in FIG. It is being That is, the outgoing portions a of the first coil 32 and the second coils 33 to 36 are sandwiched between the first yoke portions 4 and 5 and the second yoke portions 41 and 42. and the first coil 32, the first yoke parts 4, 5, and the second yoke parts 41, 4.
2 constitutes a linear motor that drives the objective lens holding cylinder 19 in the thrust direction, and the second coils 33 to 36, the first yoke parts 4 and 5, and the second yoke parts 41 and Lens holding tube 1
A rotation motor is configured to drive 9 in the radial direction. Further, the first notches 6, 7 and the second notches 44, 45 are the return path b of the second coils 33 to 36.
is placed opposite to.
対物レンズ装置１は上述の如く構成されてお
り、対物レンズ保持筒１９は支軸９にフオーカス
方向（支軸９の軸線方向）及びトラツキング方向
（支軸９のラジアル方向）に変位可能な状態で支
持されている。また、対物レンズ保持筒１９は支
持ピン２６を介在して弾性支持板１０に弾性的に
支持されているため、リニアモータ及び回動モー
タの駆動による対物レンズ保持筒１９の変位に対
して復元力が働く。即ち、弾性支板１０は対物レ
ンズ保持筒１９の中立点保持機構を構成する。な
お、弾性支持板１０はポリウレタン等によつて成
形されているため対物レンズ保持筒１９の動きに
対して共振し難し、フオーカス方向及びトラツキ
ング方向の感度に悪影響を及ぼすことがない。ま
た、弾性支持板１０は第１の切欠部７内に収容さ
れているため、対物レンズ装置１をコンパクトな
ものとすることができて非常に都合がよい。 The objective lens device 1 is configured as described above, and the objective lens holding cylinder 19 is movable on the support shaft 9 in the focusing direction (the axial direction of the support shaft 9) and the tracking direction (the radial direction of the support shaft 9). Supported. Furthermore, since the objective lens holding cylinder 19 is elastically supported by the elastic support plate 10 via the support pin 26, a restoring force is exerted against the displacement of the objective lens holding cylinder 19 due to the drive of the linear motor and the rotary motor. works. That is, the elastic support plate 10 constitutes a neutral point holding mechanism for the objective lens holding cylinder 19. Note that since the elastic support plate 10 is made of polyurethane or the like, it is difficult to resonate with the movement of the objective lens holding cylinder 19, and does not adversely affect the sensitivity in the focusing direction and the tracking direction. Further, since the elastic support plate 10 is housed in the first notch 7, the objective lens device 1 can be made compact, which is very convenient.
第１のヨーク部４，５と第２のヨーク部４１，
４２は第４図に示すように完全に対向して配置さ
れ、かつこれら両者間には内外に亘つて第１及び
第２の切欠部６，７，４４，４５が設けられてい
るので、第１及び第２のヨーク部の側方から第２
のコイル３３〜３６の復路部ｂに作用する漏れ磁
束（いわゆる飛びつき磁束）が極めて少ない。こ
のため第２のコイル３３〜３６の往路部ａを通過
する磁速密度の向上が図れると同時に、復路部ｂ
に作用する漏れ磁束によつて、その復路部ｂにて
駆動方向と逆方向の反力が生じることを極力防止
できて、回動モータの駆動モーメントが増大す
る。 first yoke parts 4, 5 and second yoke part 41,
42 are arranged completely opposite to each other as shown in FIG. from the side of the first and second yoke parts.
The leakage magnetic flux (so-called jump magnetic flux) acting on the return path portion b of the coils 33 to 36 is extremely small. Therefore, it is possible to improve the magnetic velocity density passing through the outward path section a of the second coils 33 to 36, and at the same time, the magnetic velocity density passing through the outward path section b of the second coils 33 to 36 can be improved.
It is possible to prevent as much as possible the generation of a reaction force in the direction opposite to the drive direction in the return path b due to the leakage magnetic flux acting on the rotary motor, thereby increasing the drive moment of the rotary motor.
対物レンズ２８は、対物レンズ保持筒１９の外
周部に位置して細い支軸９からの偏心量が最大と
されている。従つて対物レンズ保持筒１９の小さ
な回動量でトラツキング調整ができ、トラツキン
グ方向の感度が非常に良くなる。 The objective lens 28 is located at the outer periphery of the objective lens holding tube 19, and the amount of eccentricity from the thin support shaft 9 is maximized. Therefore, tracking can be adjusted by a small amount of rotation of the objective lens holding cylinder 19, and the sensitivity in the tracking direction is extremely improved.
以上、本発明に係る対物レンズ装置の一実施例
につき述べたが、本発明は上記実施例に示した構
造に限定されるものでなく種々の変形が可能であ
る。 Although one embodiment of the objective lens device according to the present invention has been described above, the present invention is not limited to the structure shown in the above embodiment, and various modifications are possible.
例えば上記弾性支持板１０については第５図〜
第７図に示す構造としてもよい。即ち、第５図で
は軸受２０に図示する形状の弾性支持板５０の一
端を接着し、他端部を第１の切欠部７の底壁面に
立設された支持ピン５１の上端部に接着したもの
である。なお、第５図中５２は第１の切欠部７の
底壁に設けられた治具挿入孔であつて、上記弾性
支持板５０の接着をするための治具をこの治具挿
入孔５２より挿入できるようにされている。ま
た、この治具挿入孔５２を通じて弾性支持板５０
の点検乃至調整も行ない得る。 For example, regarding the elastic support plate 10, FIG.
The structure shown in FIG. 7 may also be used. That is, in FIG. 5, one end of an elastic support plate 50 having the shape shown in the figure is adhered to the bearing 20, and the other end is adhered to the upper end of a support pin 51 provided upright on the bottom wall surface of the first notch 7. It is something. Note that 52 in FIG. 5 is a jig insertion hole provided in the bottom wall of the first notch 7, and a jig for bonding the elastic support plate 50 can be inserted through this jig insertion hole 52. It can be inserted. In addition, the elastic support plate 50 is inserted through the jig insertion hole 52.
We can also perform inspections and adjustments.
第６図はＴ字状の弾性支持板５５の一端部を軸
受２０に接着し、左右両端部を第１のヨーク部
４，５の側壁に接着したものである。この場合は
上記実施例に示したような支持ピン２６乃至５１
は不要となり、構造が簡単となる。なお、第６図
中５２は治具挿入孔である。 In FIG. 6, one end of a T-shaped elastic support plate 55 is bonded to the bearing 20, and both left and right ends are bonded to the side walls of the first yoke portions 4, 5. In this case, the support pins 26 to 51 as shown in the above embodiment are used.
is no longer necessary, simplifying the structure. Note that 52 in FIG. 6 is a jig insertion hole.
第７図は同じくＴ字状の弾性支持板５７の一端
部を軸受２０に接着したものではあるが、左右両
端部をコ字状の止め板５８の左右両端部に設けら
れた係止用切欠部５９，６０に嵌合させたもので
ある。従つて、この場合には対物レンズ保持筒１
９を支軸９に挿入すると、弾性支持板５７の左右
両端部が係止用切欠部５９，６０に係合されるの
で、組立性が向上すると共に上記治具挿入孔５２
が不要となる。 In FIG. 7, one end of the T-shaped elastic support plate 57 is glued to the bearing 20, but both left and right ends are attached to locking notches provided at both left and right ends of a U-shaped stop plate 58. The parts 59 and 60 are fitted into each other. Therefore, in this case, the objective lens holding cylinder 1
9 into the support shaft 9, both left and right ends of the elastic support plate 57 are engaged with the locking notches 59, 60, which improves assemblage and also improves the jig insertion hole 52.
becomes unnecessary.
また、上記対物レンズ保持筒１９も他の構造に
変更可能である。例えば第１のコイル３２及び第
２のコイル３３〜３６をフレキシブル基板にプリ
ント配線し、これを円筒状にして対物レンズ保持
筒１９のコイル部分を形成してもよい。この場合
にはコイル部分の製造性が極めて良好なものとな
る。また、エツジワイズ電線を用いてコイル部分
をボビンレス空心コイルとしてもよい。また、第
２のコイルにエツジワイズ電線を用いた場合には
占積率が高まり、トラツキング方向の感度をより
向上させることができる。 Further, the objective lens holding cylinder 19 can also be changed to other structures. For example, the first coil 32 and the second coils 33 to 36 may be printed and wired on a flexible substrate and made into a cylindrical shape to form the coil portion of the objective lens holding cylinder 19. In this case, the manufacturability of the coil portion is extremely good. Alternatively, the coil portion may be a bobbinless air-core coil using edgewise electric wire. Further, when an edgewise electric wire is used for the second coil, the space factor increases and the sensitivity in the tracking direction can be further improved.
本発明は上述の如く、中立点保持機構を第１の
切欠部内に収納したものであるから、対物レンズ
装置をコンパクトに構成することができる。その
上対物レンズの偏心量の増大と対物レンズ保持筒
の駆動モーメントの増大を図れ、対物レンズ装置
のトラツキング方向の感度を向上させることがで
きると言う利点も合せて得られる。 As described above, in the present invention, since the neutral point holding mechanism is housed in the first notch, the objective lens device can be configured compactly. In addition, it is possible to increase the amount of eccentricity of the objective lens and the drive moment of the objective lens holding cylinder, and it is also possible to obtain the advantage that the sensitivity of the objective lens device in the tracking direction can be improved.
第１図は本発明に係る対物レンズ装置の一実施
例を示す組立斜視図、第２図は同上の外観斜視
図、第３図は同上の縦断面図、第４図は同上の横
断面図、第５図〜第７図は弾性支持板の変形例を
示す部分斜視図である。
また図面に用いられた符号において、１……対
物レンズ装置、４，５……第１のヨーク部、６，
７……第１の切欠部、９……支軸、１０，５０，
５５，５７……弾性支持板、１９……対物レンズ
保持筒、２８……対物レンズ、３２……第１のコ
イル、３３，３４，３５，３６……第２のコイ
ル、４１，４２……第２のヨーク部、である。
Fig. 1 is an assembled perspective view showing an embodiment of the objective lens device according to the present invention, Fig. 2 is an external perspective view of the same, Fig. 3 is a longitudinal cross-sectional view of the same, and Fig. 4 is a cross-sectional view of the same. , FIGS. 5 to 7 are partial perspective views showing modified examples of the elastic support plate. Further, in the symbols used in the drawings, 1... objective lens device, 4, 5... first yoke portion, 6,
7... First notch, 9... Support shaft, 10, 50,
55, 57... Elastic support plate, 19... Objective lens holding tube, 28... Objective lens, 32... First coil, 33, 34, 35, 36... Second coil, 41, 42... This is the second yoke portion.
Claims (1)
線方向に摺動可能に構成された対物レンズ保持筒
と、上記対物レンズ保持筒に上記支軸から離間し
て設けられた対物レンズと、上記対物レンズ保持
筒の周部に設けられたフオーカス調整用の第１の
コイル手段及びトラツキング調整用の第２のコイ
ル手段と、上記対物レンズ保持筒の内外に設けら
れて上記第１のコイル手段及び第２のコイル手段
の往路を挾む第１及び第２のヨーク部と、上記第
２のコイル手段の復路に対向して上記第１及び第
２のヨーク部に設けられた第１及び第２の切欠部
とを設け、上記対物レンズ保持筒の中立点保持機
構を上記第１の切欠部内に収納させてなる対物レ
ンズ装置。1. An objective lens holding tube configured to be rotatable around a support shaft and slidable in the axial direction of the support shaft, and an objective lens provided in the objective lens holding tube at a distance from the support shaft. , a first coil means for focus adjustment and a second coil means for tracking adjustment provided on the circumference of the objective lens holding tube, and the first coil provided inside and outside of the objective lens holding tube. first and second yoke portions sandwiching the outward path of the coil means and the second coil means; and first and second yoke portions provided on the first and second yoke portions opposite to the return path of the second coil means. and a second notch, and a neutral point holding mechanism of the objective lens holding tube is accommodated in the first notch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9624981A JPS57210457A (en) | 1981-06-22 | 1981-06-22 | Objective lense device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9624981A JPS57210457A (en) | 1981-06-22 | 1981-06-22 | Objective lense device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57210457A JPS57210457A (en) | 1982-12-24 |
| JPS6212570B2 true JPS6212570B2 (en) | 1987-03-19 |
Family
ID=14159938
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9624981A Granted JPS57210457A (en) | 1981-06-22 | 1981-06-22 | Objective lense device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57210457A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02151550A (en) * | 1988-11-30 | 1990-06-11 | Fujitsu Ten Ltd | Wiper control device |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6015835A (en) * | 1983-07-05 | 1985-01-26 | Mitsubishi Electric Corp | Driving device of optical means |
| JPS6028040A (en) * | 1983-07-22 | 1985-02-13 | Sharp Corp | Optical information reader |
| JPS6028037A (en) * | 1983-07-22 | 1985-02-13 | Sharp Corp | Optical information reader |
| JPS6047128U (en) * | 1983-09-08 | 1985-04-03 | 三洋電機株式会社 | Objective lens drive device |
| JPS6080516U (en) * | 1983-11-05 | 1985-06-04 | ソニー株式会社 | Objective lens drive device for optical pickup equipment |
| JPS60102729U (en) * | 1983-12-20 | 1985-07-13 | シャープ株式会社 | lens drive device |
| JPS60136926A (en) * | 1983-12-26 | 1985-07-20 | Sharp Corp | Objective lens driver |
| JPH0612577B2 (en) * | 1983-12-27 | 1994-02-16 | 株式会社東芝 | Objective lens drive |
| JPS60194718U (en) * | 1984-06-05 | 1985-12-25 | シャープ株式会社 | objective lens device |
| JPS613334A (en) * | 1984-06-14 | 1986-01-09 | Sharp Corp | Objective lens driving device |
| JPH045058Y2 (en) * | 1984-12-28 | 1992-02-13 | ||
| JPS63135521U (en) * | 1986-09-25 | 1988-09-06 | ||
| JPH0294126A (en) * | 1988-09-30 | 1990-04-04 | Matsushita Electric Ind Co Ltd | Object lens driving device |
| CN110286460B (en) * | 2019-07-15 | 2021-03-26 | 西安应用光学研究所 | Single-side positioning cam driving mechanism for continuous zoom lens |
-
1981
- 1981-06-22 JP JP9624981A patent/JPS57210457A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02151550A (en) * | 1988-11-30 | 1990-06-11 | Fujitsu Ten Ltd | Wiper control device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57210457A (en) | 1982-12-24 |
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