JPS6213234Y2 - - Google Patents
Info
- Publication number
- JPS6213234Y2 JPS6213234Y2 JP16568181U JP16568181U JPS6213234Y2 JP S6213234 Y2 JPS6213234 Y2 JP S6213234Y2 JP 16568181 U JP16568181 U JP 16568181U JP 16568181 U JP16568181 U JP 16568181U JP S6213234 Y2 JPS6213234 Y2 JP S6213234Y2
- Authority
- JP
- Japan
- Prior art keywords
- objective lens
- holding frame
- bearing
- coil
- permanent magnet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000000696 magnetic material Substances 0.000 claims description 5
- 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 5
- 229920006364 Rulon (plastic) Polymers 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
Landscapes
- Lens Barrels (AREA)
- Optical Recording Or Reproduction (AREA)
Description
【考案の詳細な説明】
本考案は、光学式ピツクアツプの焦点制御装置
に利用して好適な対物レンズ駆動装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an objective lens driving device suitable for use in a focus control device for an optical pickup.
第１図は、従来の対物レンズ駆動装置を示す図
である。１は対物レンズ系、２は対物レンズ系を
保持する保持枠、３は軸受、４は永久磁石、５，
６は磁性体にて構成されたヨークである。保持枠
２の外周には例えばルーロンコーテイング加工が
施されており、軸受３との接触面に施いてラジア
ル方向のガタはなく、スラスト方向には摩擦の小
さい状態で円滑に移動可能である。そして、保持
枠２に取付けられたコイル７に電流を流せば、対
物レンズ系１は軸方向に移動する。即ち、焦点制
御が達成される。 FIG. 1 is a diagram showing a conventional objective lens driving device. 1 is an objective lens system, 2 is a holding frame that holds the objective lens system, 3 is a bearing, 4 is a permanent magnet, 5,
6 is a yoke made of a magnetic material. The outer periphery of the holding frame 2 is coated with, for example, Rulon coating, so that there is no play in the radial direction on the contact surface with the bearing 3, and it can move smoothly in the thrust direction with little friction. When a current is applied to the coil 7 attached to the holding frame 2, the objective lens system 1 moves in the axial direction. That is, focus control is achieved.
ところで、斯かる従来例に於いては、ヨーク
５，６にて構成されたギヤツプの間にコイル７が
挿入される構成となつている。従つて、ギヤツプ
を設ける必要がある為に、装置の小型化ができな
かつた。即ち、対物レンズの直径を８mmとした場
合、駆動装置の外径20mm前後は必要であつた。 By the way, in such a conventional example, the coil 7 is inserted between the gap formed by the yokes 5 and 6. Therefore, since it is necessary to provide a gap, it is not possible to downsize the device. That is, when the diameter of the objective lens is 8 mm, the outer diameter of the drive device is required to be around 20 mm.
そこで、本考案は、ギヤツプを廃し、装置の小
型化を図つたものである。第２図に於いて、１は
対物レンズ系、２は磁性体にて構成された保持
枠、３は中空の円筒状軸受、４はこの軸受３の外
周に設けられた同じく中空円筒状の永久磁石、７
は永久磁石４の外周に巻装されたコイルである。
保持枠２の外周にはルーロンコーテイング加工が
施こされている。また、永久磁石４はラジアル方
向（中空円筒の厚み方向）に着磁されている。そ
して、コイル７に電流を流せば、このコイル７に
流れる電流により生じる磁界及び永久磁石４によ
り生じる磁界の合成磁界に対して、磁性体にて構
成された保持枠２が移動する。即ち、対物レンズ
が移動して焦点制御が達成される。保持枠２が移
動する原理は第３図に示す通りである。即ち、コ
イル７に電流を印加しない状態に於いて、磁性体
であるレンズ保持枠２を横切る上向き及び下向き
の磁力線は等しく（実線参照）、レンズ保持枠２
は上下何れの方向にも移動しない。コイル７に電
流を印加し、例えば第３図破線にて図示する如き
磁界を発生させたとすると、レンズ保持枠２の下
方では永久磁石４による磁力線とコイル７に流れ
る電流による磁力線は相互に逆向きとなり、打消
し合う。それ故、レンズ保持枠２は磁力線が多く
通る位置即ち上方に移動することになる。もちろ
ん、逆向きの電流を印加すればレンズ保持枠２は
下方に移動する。 Therefore, the present invention aims to eliminate the gap and downsize the device. In Fig. 2, 1 is an objective lens system, 2 is a holding frame made of a magnetic material, 3 is a hollow cylindrical bearing, and 4 is a hollow cylindrical permanent part provided on the outer periphery of the bearing 3. magnet, 7
is a coil wound around the outer periphery of the permanent magnet 4.
The outer periphery of the holding frame 2 is coated with Rulon coating. Further, the permanent magnet 4 is magnetized in the radial direction (thickness direction of the hollow cylinder). When a current is passed through the coil 7, the holding frame 2 made of a magnetic material moves in response to a composite magnetic field of the magnetic field generated by the current flowing through the coil 7 and the magnetic field generated by the permanent magnet 4. That is, the objective lens moves to achieve focus control. The principle of movement of the holding frame 2 is as shown in FIG. That is, when no current is applied to the coil 7, the upward and downward lines of magnetic force that cross the lens holding frame 2, which is a magnetic material, are equal (see the solid line), and the lens holding frame 2
does not move in either the up or down direction. If a current is applied to the coil 7 to generate a magnetic field as shown by the broken line in FIG. 3, for example, below the lens holding frame 2, the lines of magnetic force due to the permanent magnet 4 and the lines of magnetic force due to the current flowing through the coil 7 will be in opposite directions. Thus, they cancel each other out. Therefore, the lens holding frame 2 is moved to a position where many lines of magnetic force pass, that is, upward. Of course, if a current in the opposite direction is applied, the lens holding frame 2 will move downward.
尚、軸受３の外周にコイル７を巻装し、その外
側に永久磁石４を配置しても良い。 Incidentally, the coil 7 may be wound around the outer periphery of the bearing 3, and the permanent magnet 4 may be disposed outside of the coil 7.
以上述べた本考案に依れば、従来、必要であつ
たギヤツプを廃することができるので、装置の小
型化が図れるものである。即ち、装置の外径が14
mm程度のものが可能となつた。 According to the present invention described above, it is possible to eliminate the conventionally necessary gap, thereby making it possible to downsize the device. That is, the outer diameter of the device is 14
It has become possible to create a material on the order of mm.
図面は何れも対物レンズ駆動装置を示すもので
あり、第１図は従来例、第２図は本考案の一実施
例、第３図は本考案の動作原理を説明する図であ
る。
１は対物レンズ系、２は保持枠、３は軸受、４
は永久磁石、７はコイル。
The drawings all show an objective lens driving device, and FIG. 1 is a conventional example, FIG. 2 is an embodiment of the present invention, and FIG. 3 is a diagram illustrating the operating principle of the present invention. 1 is an objective lens system, 2 is a holding frame, 3 is a bearing, 4
is a permanent magnet, and 7 is a coil.
Claims (1)
体にて構成された保持枠と、この保持枠に当接し
この保持枠を移動可能に支持する軸受と、この軸
受の外側に設けられ、そのラジアル方向に着磁さ
れた中空円筒状の永久磁石と、前記円筒状永久磁
石の周面に於いて円周方向に巻装されたコイル
と、よりなり、前記コイルに電流を流すことによ
り前記保持枠を前記軸受に対して移動させ、以つ
て前記対物レンズを移動させる構成とした対物レ
ンズ駆動装置。 An objective lens, a holding frame made of a magnetic material that holds this objective lens, a bearing that contacts this holding frame and movably supports this holding frame, and a bearing that is provided outside of this bearing and that extends in the radial direction. It consists of a hollow cylindrical permanent magnet magnetized to An objective lens driving device configured to move relative to the bearing and thereby move the objective lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16568181U JPS5872726U (en) | 1981-11-05 | 1981-11-05 | Objective lens drive device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16568181U JPS5872726U (en) | 1981-11-05 | 1981-11-05 | Objective lens drive device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5872726U JPS5872726U (en) | 1983-05-17 |
| JPS6213234Y2 true JPS6213234Y2 (en) | 1987-04-06 |
Family
ID=29957870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16568181U Granted JPS5872726U (en) | 1981-11-05 | 1981-11-05 | Objective lens drive device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5872726U (en) |
-
1981
- 1981-11-05 JP JP16568181U patent/JPS5872726U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5872726U (en) | 1983-05-17 |
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