JPH05144041A - Objective lens device - Google Patents
Objective lens deviceInfo
- Publication number
- JPH05144041A JPH05144041A JP4095566A JP9556692A JPH05144041A JP H05144041 A JPH05144041 A JP H05144041A JP 4095566 A JP4095566 A JP 4095566A JP 9556692 A JP9556692 A JP 9556692A JP H05144041 A JPH05144041 A JP H05144041A
- Authority
- JP
- Japan
- Prior art keywords
- objective lens
- disk
- disc
- shock absorbing
- holding cylinder
- 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.)
- Granted
Links
Landscapes
- Optical Head (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明はディスク上に記録され
たデータを光学的に読取るデータピックアップ装置に適
用して好適な対物レンズ装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an objective lens device suitable for being applied to a data pickup device for optically reading data recorded on a disc.
【０００２】[0002]
【従来の技術】光学的ビデオディスクなどのような回転
ディスク上に記録されたデータを再生する光学式ディス
ク再生装置では、レーザビームを対物レンズで収束させ
ることによってデータの再生を行なう。2. Description of the Related Art In an optical disc reproducing apparatus for reproducing data recorded on a rotating disc such as an optical video disc, the data is reproduced by converging a laser beam with an objective lens.
【０００３】すなわち、このようなデータピックアップ
装置に設けられる対物レンズ装置は、特願昭５６−９６
２４８号明細書等で知られる構成のものが使用される。
図面を使用してその構成の概略を説明すると、図８に示
すように、データの記録されたディスクＤの下面ＤA 側
に所定の距離Ｈ1 を隔てて対物レンズ装置１が配され
る。That is, an objective lens device provided in such a data pickup device is disclosed in Japanese Patent Application No. 56-96.
A structure known from the specification of No. 248 or the like is used.
The outline of the configuration will be described with reference to the drawings. As shown in FIG. 8, the objective lens device 1 is arranged at a predetermined distance H 1 on the lower surface D A side of the disk D on which data is recorded.
【０００４】対物レンズ装置１はディスクＤ側に設けら
れた対物レンズ２８とこの対物レンズ２８を固定する保
持筒１９を少くとも有し、対物レンズ２８で収束された
レーザビームがディスクＤに照射されて、その反射光で
図９に示すデータＤS が再生される。The objective lens device 1 has at least an objective lens 28 provided on the disc D side and a holding cylinder 19 for fixing the objective lens 28, and the laser beam focused by the objective lens 28 is applied to the disc D. Then, the data D S shown in FIG. 9 is reproduced by the reflected light.
【０００５】信号ピックアップ用の光源としては一般
に、価格が低廉で、装置の小形化にも好適な半導体レー
ザーが使用される。As a light source for a signal pickup, a semiconductor laser which is inexpensive and suitable for downsizing the device is generally used.
【０００６】半導体レーザーは波長が７８０ｎｍで、ヘ
リウムネオンレーザーの波長６２３．８ｎｍよりも長
い。このため、光源としてヘリウムネオンレーザーを用
いた場合と同程度の分解能を得ることができるようなス
ポット径にしようとすると対物レンズのＮＡ（Numerica
l Aperture）値を０．５位に大きくしなければならな
い。The wavelength of the semiconductor laser is 780 nm, which is longer than the wavelength of 623.8 nm of the helium neon laser. Therefore, if an attempt is made to make the spot diameter so as to obtain the same resolution as when a helium neon laser is used as the light source, the NA (Numerica) of the objective lens
l Aperture) value should be increased to 0.5.
【０００７】このように対物レンズのＮＡ値を上げる
と、ディスクＤと対物レンズ２８との間隔Ｈ1 は非常に
狭くならざるを得ない。When the NA value of the objective lens is increased in this way, the distance H 1 between the disc D and the objective lens 28 is inevitably narrowed.
【０００８】ところで、対物レンズ装置１はデータを常
に最良の状態でピックアップする関係で、フォーカス調
整及びトラッキング調整のため、レーザビームの光路方
向、すなわちスラスト方向および光路と垂直な方向、す
なわちラジアル方向に夫々移動自在に構成され、例えば
フォーカスサーチ時には対物レンズ装置１を上下動させ
てジャストフォーカスさせるようにしている。By the way, since the objective lens device 1 always picks up data in the best state, in order to perform focus adjustment and tracking adjustment, in the optical path direction of the laser beam, that is, the thrust direction and the direction perpendicular to the optical path, that is, the radial direction. Each of them is configured to be movable, and for example, during focus search, the objective lens device 1 is moved up and down to just focus.
【０００９】一方、上述のような光学式ディスク再生装
置では、スピンドル軸の曲がり、ディスク受け台の曲が
り、ディスク自体のスキューなどの原因で、ディスクＤ
の記録面に対して対物レンズ装置１の光軸が垂直でなく
なる場合があり、従って、このようなスキューが発生す
ると図８のように、αなる傾き（αをスキュー角とい
う）がある状態で、フォーカス調整を行なう必要があ
る。On the other hand, in the optical disc reproducing apparatus as described above, the disc D is caused by the bending of the spindle shaft, the bending of the disc pedestal, the skew of the disc itself, and the like.
In some cases, the optical axis of the objective lens device 1 may not be perpendicular to the recording surface of 1. Therefore, when such a skew occurs, as shown in FIG. 8, there is an inclination of α (α is a skew angle). , It is necessary to adjust the focus.
【００１０】このようなスキューのある状態でフォーカ
スサーチを行なう場合、このフォーカスサーチ時あるい
はフォーカスはずれ時、対物レンズ装置１がディスクＤ
と接触する事故が起こることがある。これは上述したよ
うに半導体レーザーを使用することによって間隔Ｈ1 が
非常に狭くなり、例えば２．０５ｍｍ程度の祐度しかな
いも拘らず、スキューがあると、場合によっては基準水
平面に対し±１．２ｍｍ程度ディスクＤが上下に変動す
る場合があるからである。When a focus search is performed in such a skewed state, the objective lens device 1 is moved to the disk D by the focus search or out of focus.
Accidents that come into contact with may occur. This is because the distance H 1 is extremely narrowed by using the semiconductor laser as described above, and although there is only about 2.05 mm, the skew H may be ± 1 with respect to the reference horizontal plane depending on the case. This is because the disk D may fluctuate up and down by about 2 mm.
【００１１】従って、このようなとき対物レンズ装置１
がディスクＤに接触すると、ディスクＤが高速回転駆動
されている関係で、対物レンズ２８に傷が付いたり、デ
ィスクＤの組材が削り取られて対物レンズ２８に付着し
たりしてしまう。Therefore, in such a case, the objective lens device 1
When the disk D contacts the disk D, the objective lens 28 may be scratched or the assembly material of the disk D may be scraped off and adhere to the objective lens 28 because the disk D is driven to rotate at a high speed.
【００１２】そのため、従来では図１０に示すようなリ
ング状の緩衝材５０を、図１１に示すようにレンズ保持
筒１９のディスク対向端面１９Ａに取り付け、対物レン
ズ装置１がディスクＤの下面ＤA に衝合しても、これに
よって対物レンズ２８が傷付いたり、ディスクＤの組材
が削り取られないように工夫している。Therefore, conventionally, a ring-shaped cushioning material 50 as shown in FIG. 10 is attached to the disk facing end surface 19A of the lens holding cylinder 19 as shown in FIG. 11, and the objective lens device 1 is placed on the lower surface D A of the disk D. The objective lens 28 is not damaged or the assembly material of the disk D is scraped off even if it collides with.
【００１３】[0013]
【発明が解決しようとする課題】ところで、このような
緩衝材５０をディスク対向端面１９Ａに取付けた場合、
この緩衝材５０はリング状をなすものであるから、対物
レンズ装置１のディスクＤへの衝合時は図１２に示すよ
うに、ディスクＤの回転方向に向って対物レンズ２８の
後側に存在する緩衝材５０が矢印Ｃ方向に変形を受け、
そのときの緩衝材５０の削れ粉や、ディスクＤの削れ粉
が緩衝材５０の内側に入り込み、これらが対物レンズ２
８に付着してしまう。By the way, when such a cushioning material 50 is attached to the disk facing end surface 19A,
Since this cushioning material 50 has a ring shape, when the objective lens device 1 collides with the disc D, it exists on the rear side of the objective lens 28 in the rotational direction of the disc D as shown in FIG. The cushioning material 50 that undergoes deformation in the direction of arrow C,
The shavings of the cushioning material 50 and the shavings of the disc D at that time enter the inside of the cushioning material 50, and these become the objective lens 2
It adheres to 8.
【００１４】従って、対物レンズ２８の傷付き防止は図
りうるものの、緩衝材５０やディスクＤ自体の削れ粉の
対物レンズ２８への付着防止については不完全であっ
た。Therefore, although the objective lens 28 can be prevented from being scratched, the prevention of the abrasion powder of the cushioning material 50 and the disc D itself from adhering to the objective lens 28 is incomplete.
【００１５】この発明はこのような問題点を解決したも
のであって、ディスクＤへの対物レンズ装置１の衝合時
の、対物レンズ２８の傷付き及び対物レンズ２８への削
れ粉の付着を構成簡単に除去できる対物レンズ装置を提
案するものである。The present invention solves such a problem and prevents scratches on the objective lens 28 and adhesion of shavings to the objective lens 28 when the objective lens device 1 collides with the disk D. An objective lens device that can be easily removed is proposed.
【００１６】[0016]
【課題を解決するための手段】上述の問題点を解消する
ため、この発明では図１及び図２に示すように、対物レ
ンズ保持筒１９のディスク対向端面に、図７に示す如く
ディスクＤの回転方向と並行に、少くとも１つ実施例で
は対物レンズ２８を挟持するように２つの緩衝材５０
Ａ，５０Ｂが、対物レンズ２８より突出して設けられ
る。In order to solve the above-mentioned problems, according to the present invention, as shown in FIGS. 1 and 2, the disk D of the objective lens holding cylinder 19 faces the disk facing end surface as shown in FIG. In parallel with the rotation direction, at least one of the two cushioning members 50 is provided so as to sandwich the objective lens 28 in the embodiment.
A and 50B are provided so as to protrude from the objective lens 28.
【００１７】[0017]
【作用】上述の構成によれば、対物レンズ装置１がディ
スクＤに衝合しても、この緩衝材５０Ａ，５０Ｂによっ
て対物レンズ２８が保護され、対物レンズ２８の表面に
傷等が付くおそれはない。また、緩衝材５０Ａ，５０Ｂ
は回転方向と並行であるので、ディスクＤの衝合によっ
て緩衝材５０Ａ，５０ＢやディスクＤのものの削れ粉が
生じても、この削れ粉は図７の矢印ｄ方向に飛散し、対
物レンズ２８に付着し、対物レンズ２８の表面が汚れる
おそれはない。According to the above construction, even if the objective lens device 1 collides with the disc D, the objective lens 28 is protected by the cushioning materials 50A and 50B, and the surface of the objective lens 28 may not be damaged. Absent. Also, the cushioning material 50A, 50B
Is parallel to the rotation direction, so even if shavings of the cushioning materials 50A, 50B and the disk D occur due to the collision of the disc D, the shavings scatter in the direction of arrow d in FIG. There is no possibility that they will adhere and the surface of the objective lens 28 will become dirty.
【００１８】[0018]
【実施例】続いて、この発明に係る対物レンズ装置を上
述した公知の対物レンズ装置１に適用した場合につき、
図１以下を参照して詳細に説明する。EXAMPLES Next, the case where the objective lens device according to the present invention is applied to the above-mentioned known objective lens device 1,
This will be described in detail with reference to FIG.
【００１９】図１はこの発明に係る対物レンズ装置１の
分解斜視図であって、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
によって一体形成されている。従って、受け台部３の前
後両側に第１のヨーク部４と５に挟まれた、一対の第１
の切欠部６，７が形成される。FIG. 1 is an exploded perspective view of an objective lens device 1 according to the present invention, in which a pedestal 3 is formed in the center of a circular base plate 2. Also, this cradle part 3
A pair of first yoke portions 4 and 5 each having a fan shape (having a central angle of substantially right angle) are provided on both left and right sides of the base plate 3, and the pedestal portion 3 and the first yoke portions 4 and 5 together with the base plate 2. The magnetic material is integrally formed. Therefore, a pair of first yoke portions 4 and 5 sandwiched between the first yoke portions 4 and 5 on both front and rear sides of the pedestal portion 3.
The notches 6 and 7 are formed.
【００２０】台板２には図４に示すように一対の第１の
切欠部６，７のいずれか一方、例えば第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。As shown in FIG. 4, the base plate 2 is provided with a fan-shaped light window 14 which communicates with either one of the pair of first notches 6 and 7, for example, the first notch 6. A laser beam is passed through the window 14.
【００２１】第１のヨーク部４，５は、その高さが受け
台板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１
６，１７には図１、図３及び図４に示すように、ポリウ
レタン等によって略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。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 heights of the first yoke portions 4 and 5 are made higher than that of the pedestal plate 3, and the first yoke portions 4 and 5 have a pair of inner side surfaces 16 and 17 facing each other. The inner side surfaces 16 and 17 are parallel to each other, and each inner side surface 1
As shown in FIGS. 1, 3 and 4, the elastic support plates 10 and 6 are made of polyurethane or the like and have a substantially U-shape.
The left and right end portions 11 and 12 are adhered. The bent portion 13 of the elastic support plate 10 is parallel to the base plate 2 and extends toward the outer peripheral portion thereof, and the bent portion 13 is provided with a support hole 18 in the vertical direction.
【００２２】受け台部３の中央部には、図３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を可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。As shown in FIG. 3, a fixing hole 8 is vertically provided in the central portion of the pedestal portion 3, and a lower end portion of a thin metal support shaft 9 is inserted into the hole 8 to be vertically provided. It is fixed in a shape. The bearing 20 of the objective lens holding cylinder 19 is movably and slidably inserted in the support shaft 9 in the thrust direction. That is, the objective lens holding cylinder 19
Has a cylindrical shape that can be fitted to the outer peripheries of the first yoke portions 4 and 5, and the upper end portion thereof is covered with the end plate portion 21.
【００２３】端板部２１上にはその直径方向に沿って突
出部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に挿入固定されている。A projecting portion 22 is integrally formed on the end plate portion 21 along the diametrical direction thereof, and an end portion is formed at the central portion of the projecting portion 22 (corresponding to the axial center portion of the objective lens holding cylinder 19). A bearing fixing hole 23 that penetrates vertically to the plate portion 21 side is provided. The upper end of the bearing 20 is inserted into and fixed to the fixing hole 23. Further, the upper end of the support pin 26 is vertically inserted into the one end of the protrusion 22 from the back side of the end plate 21, and the lower end of the support pin 26 is inserted and fixed in the support hole 18 of the elastic support plate 10. ing.
【００２４】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
はセラミック等によって成形する。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
ュ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ック等の非金属材料を使
用するのが好ましい。At this time, an adhesive is applied to the lower end of the support pin 26 in advance so that the bearing 20 and the support pin 26 of the objective lens holding cylinder 19 can be inserted into the support shaft 9 and the support hole 18 at the same time. To do. The bearing 20 is formed of a self-lubricating synthetic resin such as nylon or polyacetal, or ceramic. Further, although aluminum or duralumin having a small specific gravity may be used as the material of the objective lens holding cylinder 19, a nonmetallic material such as synthetic resin or ceramic is used to prevent the occurrence of eddy current loss. preferable.
【００２５】突起部２２の他端部には、図１及び図３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。従って、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ー光線が上記第１の切
欠部６を通って対物レンズ２８に導かれるようにされて
いる。As shown in FIGS. 1 and 3, a lens hole 27 penetrating to the end plate 21 side is vertically provided at the other end of the protrusion 22. Then, the lens frame 29 in which the objective lens 28 is fitted is inserted into the lens hole 27 and attached. Therefore, the light window 14 is located directly below the objective lens 28, and the laser beam introduced from the light window 14 into the objective lens holding cylinder 19 is guided to the objective lens 28 through the first cutout 6. Has been
【００２６】対物レンズ保持筒１９の外周面には、図１
に示すようにその周方向に沿ってフォーカス調整用の第
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
ラッキング調整用の第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。The outer peripheral surface of the objective lens holding cylinder 19 is shown in FIG.
As shown in, the first coil 32 for focus adjustment is wound and adhered along the 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 laminated and adhered. These second coils 33 to 36 are attached so as to form an angle difference of 90 ° with respect to the axis of the objective lens holding barrel 19, and each of the second coils 33 is attached.
The normal line at the central portion of ~ 36 makes an angle difference of 45 ° with the longitudinal direction of the protrusion 22. Further, the outward path a and the return path b of each of the second coils 33 to 36 are parallel to the axis of the objective lens holding cylinder 19.
【００２７】台板２上の外周部には、図１〜図３に示す
ようにリング状のマグネット４０が取り付けられてい
る。そして、このマグネット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４１，４
２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。従って、第２
のヨーク部４１と４２との間には第２の切欠部４４と４
５が形成される。A ring-shaped magnet 40 is attached to the outer peripheral portion of the base plate 2 as shown in FIGS. A pair of second yoke portions 41 and 42 are attached to the upper side surface of the magnet 40. The second yoke portions 41 and 42 are ring-shaped yoke mounting portions 43.
The second yoke portions 41 and 4 are integrally provided on the second yoke portions 41 and 4 respectively.
2 is formed to have a length of a quarter circumference of the yoke mounting portion 43 and is arranged to face each other. Therefore, the second
The second notches 44 and 4 between the yoke portions 41 and 42 of the
5 is formed.
【００２８】第２のヨーク部４１，４２と第２の切欠部
４４，４５は、図４に示すように対物レンズ保持筒１９
を挟んで第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とによっ
て挟まれている。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４１，４２によって対物
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によって対物レ
ンズ保持筒１９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。The second yoke portions 41, 42 and the second cutout portions 44, 45 are formed in the objective lens holding cylinder 19 as shown in FIG.
It is attached so as to face the first yoke portions 4 and 5 and the first cutout portions 6 and 7, respectively, with respect to each other. That is, the forward path a of the first coil 32 and the second coils 33 to 36 is the first
It is sandwiched by the yoke portions 4 and 5 and the second yoke portions 41 and 42. The first coil 32, the first yoke portions 4 and 5, and the second yoke portions 41 and 42 constitute 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 portions 4 and 5 and the second yoke portions 41 and 42 constitute a rotary motor that drives the objective lens holding cylinder 19 in the radial direction. Further, the first cutouts 6 and 7 and the second cutouts 44 and 45 are arranged to face the return path b of the second coils 33 to 36.
【００２９】ディスクＤと対向するレンズ保持筒１９の
端面である突起部２２には対物レンズ２８に対する緩衝
材５０が設けられる。即ち、対物レンズ２８を収納する
レンズ枠２９が挿着されるレンズ孔２７の、ディスクＤ
の回転方向と並行する外周面の所定位置に、少なくとも
１つ、この例ではレンズ孔２７を挟む外周面の所定位置
に２つの緩衝材５０Ａ，５０Ｂが設けられる。A buffer member 50 for the objective lens 28 is provided on the protrusion 22 which is the end surface of the lens holding cylinder 19 facing the disk D. That is, the disc D of the lens hole 27 into which the lens frame 29 for housing the objective lens 28 is inserted.
At least one buffer member 50A, 50B is provided at a predetermined position on the outer peripheral surface parallel to the rotation direction of, and in this example, at a predetermined position on the outer peripheral surface sandwiching the lens hole 27.
【００３０】そのため、図６に示すように突起部２２に
は凹部５１Ａ，５１Ｂが形成され、ここに例えば、図５
Ａに示す所定の長さの緩衝材５０Ａ，５０Ｂが嵌入、固
定される。Therefore, as shown in FIG. 6, recesses 51A and 51B are formed in the protrusion 22. Here, for example, as shown in FIG.
The cushioning materials 50A and 50B having a predetermined length shown in A are fitted and fixed.
【００３１】凹部５１Ａ，５１Ｂの長さＬは図７に示す
ように、この例では対物レンズ２８の直径とほぼ同じ長
さに選定され、その形状は直線状でも、データトラック
と同様な曲率の円弧を持つ曲線状に選定してもよい。図
は直線状に選定した場合である。また、この凹部５１
Ａ，５１Ｂに棒状の緩衝材５０Ａ，５０Ｂを嵌入した状
態でこの緩衝材５０Ａ，５０Ｂの対物レンズ２８からの
突出長Ｈ2 は図６に示すように、ほぼ０．５ｍｍ程度に
選定される。緩衝材５０Ａ，５０Ｂは例えば、羊製フエ
ルトを使用することができる。As shown in FIG. 7, the length L of the recesses 51A and 51B is selected to be substantially the same as the diameter of the objective lens 28 in this example. Even if the shape is linear, the curvature is similar to that of the data track. It may be selected in a curved shape having an arc. The figure shows the case of linear selection. In addition, this recess 51
With the rod-shaped cushioning materials 50A and 50B fitted in A and 51B, the projection length H 2 of the cushioning materials 50A and 50B from the objective lens 28 is selected to be about 0.5 mm, as shown in FIG. As the cushioning materials 50A and 50B, for example, sheep felt can be used.
【００３２】なお、緩衝材５０Ａ，５０Ｂを凹部５１
Ａ，５１Ｂに強固に固定するため、凹部５１Ａ，５１Ｂ
内に装着剤を塗布してもよい。The cushioning materials 50A and 50B are formed in the recess 51.
Since it is firmly fixed to A and 51B, recesses 51A and 51B
A mounting agent may be applied inside.
【００３３】この構成によれば、図７に示すようにディ
スクＤの回転方向と並行に一対の緩衝材５０Ａ，５０Ｂ
が対物レンズ２８より突出して設けられるため、対物レ
ンズ装置１がディスクＤに衝合しても、この緩衝材５０
Ａ，５０Ｂによって、対物レンズ２８の表面が保護され
る。According to this structure, as shown in FIG. 7, a pair of cushioning members 50A and 50B are arranged in parallel with the rotation direction of the disk D.
Is provided so as to project from the objective lens 28, even if the objective lens device 1 collides with the disc D, the cushioning material 50
The surface of the objective lens 28 is protected by A and 50B.
【００３４】そして、緩衝材５０Ａ，５０Ｂは回転方向
と並行に設けられているため、ディスクＤに対物レンズ
装置１が接触しても、図７に示すように緩衝材５０Ａ，
５０Ｂは矢印ｄ方向に変形されるだけであり、このとき
若し緩衝材５０Ａ，５０Ｂの表面が削られて、その削り
粉が飛散しても、飛散方向はディスクＤの回転方向、即
ち矢印ｄ方向であるため、この削り粉が対物レンズ２８
の表面に付着するようなおそれはない。Since the cushioning materials 50A and 50B are provided in parallel with the rotation direction, even if the objective lens device 1 comes into contact with the disk D, as shown in FIG.
50B is only deformed in the direction of the arrow d. At this time, even if the surfaces of the cushioning materials 50A and 50B are scraped and the shavings scatter, the scattering direction is the rotation direction of the disk D, that is, the arrow d. Since this is the direction, the shavings are
There is no danger of sticking to the surface of.
【００３５】勿論、ディスクＤの表面が削られてその削
り粉が飛散しても、上述と同様に削り粉は矢印ｄ方向に
飛散するから、この場合もその削り粉が対物レンズの表
面に付着する確率は非常に少ない。Of course, even if the surface of the disk D is scraped and the shavings scatter, the shavings also scatter in the direction of the arrow d in the same manner as described above. In this case also, the shavings adhere to the surface of the objective lens. The probability of doing it is very low.
【００３６】使用する緩衝材５０Ａ，５０Ｂの形状は図
５Ｂ，Ｃに示すように、楕円状もしくは角状でもよい。
あるいはまた同図Ｄに示すように、リング状で１８０°
離れた位置の上面に図のような一対の突出部を形成し、
この突出部を緩衝材５０Ａ，５０Ｂとして使用してもよ
い。但し、この場合には、突起部２２に形成される凹部
５１Ａ，５１Ｂはリング状となる。The shapes of the cushioning materials 50A and 50B used may be elliptical or angular as shown in FIGS. 5B and 5C.
Alternatively, as shown in Fig. D, the ring shape is 180 °.
Form a pair of protrusions as shown on the upper surface of the distant position,
You may use this protrusion part as the buffer materials 50A and 50B. However, in this case, the recesses 51A and 51B formed in the protrusion 22 have a ring shape.
【００３７】また、対物レンズ保持筒１９は支軸９にフ
ォーカス方向（支軸９の軸線方向）及びトラッキング方
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
支持板１０は対物レンズ保持筒１９の中立点保持機構を
構成する。The objective lens holding barrel 19 is supported by the support shaft 9 in a displaceable state in the focus direction (axial direction of the support shaft 9) and the tracking direction (radial direction of the support shaft 9). Further, the objective lens holding cylinder 19 has a support pin 26.
Since it is elastically supported by the elastic support plate 10 with the interposition of, the restoring force acts on the displacement of the objective lens holding cylinder 19 driven by the linear motor and the rotation motor. That is, the elastic support plate 10 constitutes a neutral point holding mechanism of the objective lens holding barrel 19.
【００３８】なお、弾性支持板１０はポリウレタン等に
よっ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く、フォーカス方向及びトラッキン
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。Since the elastic support plate 10 is made of polyurethane or the like, it is difficult for the elastic support plate 10 to resonate with the movement of the objective lens holding barrel 19, and the sensitivity in the focus direction and the tracking direction is not adversely affected. Further, since the elastic support plate 10 is housed in the first cutout portion 7,
It is very convenient that the objective lens device 1 can be made compact.
【００３９】第１のヨーク部４，５と第２のヨーク部４
１，４２は図４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って第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を通過する磁束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って、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。The first yoke portions 4 and 5 and the second yoke portion 4
1, 42 are arranged completely opposite to each other as shown in FIG.
And since the 1st and 2nd notch parts 6, 7, 44, 45 are provided between these both over the inside and outside, from the side of the 1st and 2nd yoke part, the 2nd coil 33-. The leakage magnetic flux (so-called jumping magnetic flux) acting on the return path b of 36 is extremely small. Therefore, it is possible to improve the magnetic flux density of the second coils 33 to 36 passing through the forward path portion a, and at the same time, due to the leakage magnetic flux acting on the return path portion b, a reaction force in the reverse direction to the driving direction is generated in the return path portion b. Can be prevented as much as possible,
The driving moment of the rotary motor increases.
【００４０】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。従って対物レンズ保持筒１９の小さな回動量
でトラッキング調整ができ、トラッキング方向の感度が
非常に良くなる。The objective lens 28 is the objective lens holding cylinder 19
The maximum amount of eccentricity from the thin spindle 9 is located at the outer peripheral portion of. Therefore, tracking adjustment can be performed with a small amount of rotation of the objective lens holding barrel 19, and the sensitivity in the tracking direction becomes very good.
【００４１】なお、上述の実施例では一対の緩衝材を使
用しているが、１つでもよい。緩衝材５０の長さは一例
であって、対物レンズ２８の直径よりも短くてもよい。Although a pair of cushioning materials is used in the above embodiment, one cushioning material may be used. The length of the cushioning material 50 is an example, and may be shorter than the diameter of the objective lens 28.
【００４２】[0042]
【発明の効果】以上説明したようにこの発明では、図１
及び図２に示すように、対物レンズ保持筒１９のディス
ク対向端面に、図７に示す如くディスクＤの回転方向と
並行に、少なくとも１つ、実施例では対物レンズ２８を
挟持するように２つの緩衝材５０Ａ，５０Ｂを、対物レ
ンズ２８より所定長Ｈ2 だけ突出して設けたものであ
る。As described above, according to the present invention, as shown in FIG.
As shown in FIG. 2, at least one, in the embodiment, two objective lenses 28 are sandwiched on the end surface of the objective lens holding cylinder 19 facing the disc in parallel with the rotation direction of the disc D as shown in FIG. The cushioning materials 50A and 50B are provided so as to protrude from the objective lens 28 by a predetermined length H 2 .
【００４３】この構成によれば、対物レンズ装置１がデ
ィスクＤに衝合しても、この緩衝材５０Ａ，５０Ｂによ
って対物レンズ２８が保護され、対物レンズ２８の表面
に傷等が付くおそれはない。また、緩衝材５０Ａ，５０
Ｂは回転方向と並行であるので、ディスクＤの衝合によ
って緩衝材５０Ａ，５０ＢやディスクＤそのものの削れ
粉が生じても、この削れ粉は図７の矢印ｄ方向に飛散す
るため、対物レンズ２８に付着し、対物レンズ２８の表
面が汚れるおそれはない。According to this structure, even if the objective lens device 1 collides with the disc D, the objective lens 28 is protected by the cushioning materials 50A and 50B, and there is no possibility that the surface of the objective lens 28 will be damaged. .. In addition, the cushioning materials 50A, 50
Since B is parallel to the rotation direction, even if shavings of the cushioning materials 50A, 50B and the disc D itself are generated by the collision of the disc D, the shavings scatter in the direction of arrow d in FIG. There is no risk that the surface of the objective lens 28 will become dirty by being attached to the surface 28.
【００４４】従って、この発明の構成によれば、極めて
簡単な構成で対物レンズ２８の保護及び対物レンズ２８
の表面の汚れを防止することができるので、上述したよ
うな光学式ディスク再生装置に使用されるデータピック
アップ装置の対物レンズ装置に適用して極めて好適であ
る。Therefore, according to the structure of the present invention, the objective lens 28 can be protected and the objective lens 28 can be protected with a very simple structure.
Since it is possible to prevent the surface of the device from being soiled, it is extremely suitable for application to the objective lens device of the data pickup device used in the above-mentioned optical disc reproducing device.
【図１】この発明に係る対物レンズ装置の一例を示す分
解斜視図である。FIG. 1 is an exploded perspective view showing an example of an objective lens device according to the present invention.
【図２】その組立後の斜視図である。FIG. 2 is a perspective view after the assembly.
【図３】その縦断面図である。FIG. 3 is a vertical sectional view thereof.
【図４】その横断面図である。FIG. 4 is a transverse sectional view thereof.
【図５】Ａ〜Ｄは緩衝材の一例を示す斜視図である。5A to 5D are perspective views showing an example of a cushioning material.
【図６】この発明の要部の拡大断面図である。FIG. 6 is an enlarged sectional view of a main part of the present invention.
【図７】ディスクと対物レンズ装置との関係を示す図で
ある。FIG. 7 is a diagram showing a relationship between a disc and an objective lens device.
【図８】この発明の説明に供する対物レンズ装置の概略
的な説明図である。FIG. 8 is a schematic explanatory diagram of an objective lens device used for explaining the present invention.
【図９】その動作説明図である。FIG. 9 is an explanatory diagram of the operation.
【図１０】従来の緩衝材の斜視図である。FIG. 10 is a perspective view of a conventional cushioning material.
【図１１】この緩衝材を使用した状態の対物レンズ装置
の断面図である。FIG. 11 is a cross-sectional view of the objective lens device using this cushioning material.
【図１２】図７と同様な説明図である。12 is an explanatory diagram similar to FIG. 7.
１ 対物レンズ装置 １９ 対物レンズ保持筒 ２９ レンズ枠 ２８ 対物レンズ ５０，５０Ａ，５０Ｂ 緩衝材 ２２ ディスク対向端面 Ｄ ディスク ５１Ａ，５１Ｂ 凹部 DESCRIPTION OF SYMBOLS 1 Objective lens device 19 Objective lens holding cylinder 29 Lens frame 28 Objective lens 50, 50A, 50B Buffer material 22 Disc facing end surface D Disc 51A, 51B Recess
Claims (1)
に読取るデータピックアップ装置の光路上に設けられる
対物レンズ装置において、対物レンズを固定する対物レ
ンズ保持筒の上記ディスクと対向する端面に、上記ディ
スクの回転方向と並行に、少くとも１つの緩衝材が上記
対物レンズより突出して取付けられてなる対物レンズ装
置。1. An objective lens device provided on an optical path of a data pickup device for optically reading data recorded on a disc, wherein an end face of the objective lens holding cylinder for fixing the objective lens facing the disc is provided with An objective lens device in which at least one cushioning material is mounted so as to protrude from the objective lens in parallel with the rotation direction of the disc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4095566A JP2593998B2 (en) | 1992-04-15 | 1992-04-15 | Pickup device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4095566A JP2593998B2 (en) | 1992-04-15 | 1992-04-15 | Pickup device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05144041A true JPH05144041A (en) | 1993-06-11 |
| JP2593998B2 JP2593998B2 (en) | 1997-03-26 |
Family
ID=14141148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4095566A Expired - Lifetime JP2593998B2 (en) | 1992-04-15 | 1992-04-15 | Pickup device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2593998B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1209670A2 (en) | 2000-11-22 | 2002-05-29 | Sony Corporation | Optical pickup apparatus and disk drive apparatus |
| EP1548717A1 (en) * | 2002-09-30 | 2005-06-29 | Pioneer Corporation | Optical disk reproducing device, object lens, protection member and optical disk reproducing method |
| WO2006098361A1 (en) * | 2005-03-17 | 2006-09-21 | Matsushita Electric Industrial Co., Ltd. | Optical pickup device and optical disc device |
| JP2007149178A (en) * | 2005-11-25 | 2007-06-14 | Hitachi Ltd | Optical disk drive |
| WO2008096565A1 (en) * | 2007-02-08 | 2008-08-14 | Konica Minolta Opto, Inc. | Composite objective lens and optical pickup device |
| US7631321B2 (en) | 2004-10-21 | 2009-12-08 | Ntn Corporation | Lens protector and optical pick-up |
| US7710846B2 (en) | 2006-03-29 | 2010-05-04 | Nitto Denko Corporation | Protection member and optical pickup device using the same |
| KR20160102990A (en) | 2013-12-27 | 2016-08-31 | 후루카와 덴키 고교 가부시키가이샤 | Filler material for organic electroluminescent element, and method for sealing organic electroluminescent element |
-
1992
- 1992-04-15 JP JP4095566A patent/JP2593998B2/en not_active Expired - Lifetime
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002222535A (en) * | 2000-11-22 | 2002-08-09 | Sony Corp | Optical pickup device and disk drive device |
| EP1209670A2 (en) | 2000-11-22 | 2002-05-29 | Sony Corporation | Optical pickup apparatus and disk drive apparatus |
| EP1209670A3 (en) * | 2000-11-22 | 2007-05-30 | Sony Corporation | Optical pickup apparatus and disk drive apparatus |
| JP4569800B2 (en) * | 2000-11-22 | 2010-10-27 | ソニー株式会社 | Optical pickup device and disk drive device |
| KR100803710B1 (en) * | 2000-11-22 | 2008-02-15 | 소니 가부시끼 가이샤 | Optical pickup apparatus and disk drive apparatus |
| EP1548717A1 (en) * | 2002-09-30 | 2005-06-29 | Pioneer Corporation | Optical disk reproducing device, object lens, protection member and optical disk reproducing method |
| EP1548717A4 (en) * | 2002-09-30 | 2007-03-28 | Pioneer Corp | Optical disk reproducing device, object lens, protection member and optical disk reproducing method |
| US7631321B2 (en) | 2004-10-21 | 2009-12-08 | Ntn Corporation | Lens protector and optical pick-up |
| WO2006098361A1 (en) * | 2005-03-17 | 2006-09-21 | Matsushita Electric Industrial Co., Ltd. | Optical pickup device and optical disc device |
| JP2007149178A (en) * | 2005-11-25 | 2007-06-14 | Hitachi Ltd | Optical disk drive |
| JP4589221B2 (en) * | 2005-11-25 | 2010-12-01 | 株式会社日立製作所 | Optical disk device |
| US7710846B2 (en) | 2006-03-29 | 2010-05-04 | Nitto Denko Corporation | Protection member and optical pickup device using the same |
| WO2008096565A1 (en) * | 2007-02-08 | 2008-08-14 | Konica Minolta Opto, Inc. | Composite objective lens and optical pickup device |
| KR20160102990A (en) | 2013-12-27 | 2016-08-31 | 후루카와 덴키 고교 가부시키가이샤 | Filler material for organic electroluminescent element, and method for sealing organic electroluminescent element |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2593998B2 (en) | 1997-03-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |