JPS6343816B2 - - Google Patents
Info
- Publication number
- JPS6343816B2 JPS6343816B2 JP57008030A JP803082A JPS6343816B2 JP S6343816 B2 JPS6343816 B2 JP S6343816B2 JP 57008030 A JP57008030 A JP 57008030A JP 803082 A JP803082 A JP 803082A JP S6343816 B2 JPS6343816 B2 JP S6343816B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic member
- lens barrel
- winding
- outer 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
Links
- 238000004804 winding Methods 0.000 claims description 53
- 230000003287 optical effect Effects 0.000 claims description 28
- 230000004907 flux Effects 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000003908 quality control method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 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 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000000630 rising effect Effects 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
- Optical Recording Or Reproduction (AREA)
Description
【発明の詳細な説明】
〔発明の属する技術分野〕
この発明は例えば音響用光学式デジタル記録円
盤の再生用として適した電磁力支持式の光デイス
ク用ピツクアツプに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to an electromagnetically supported optical disc pickup suitable for reproducing an audio-optical digital recording disc, for example.
従来、光デイスクに記録された信号等を再生す
るためのものとして第１図ａ，ｂに示す光デイス
ク用ピツクアツプがある。
2. Description of the Related Art Conventionally, there is an optical disk pickup shown in FIGS. 1a and 1b for reproducing signals recorded on an optical disk.
図に示すように、この光デイスク用ピツクアツ
プは静止部１と可動式の鏡筒２からなり、鏡筒２
にはレンズ３等が装着されている。この鏡筒２
は、可動架台４に対して一方（図示左右方向）に
のみ動きうるように１対の平行な板ばね５ａ，５
ｂによつて支持され、さらに可動架台４は鏡筒２
の軸線の方向（図示上下方向）にのみ動き得るよ
うに上下に設けられた１対の平行な板ばね６ａ，
６ｂによつて支持されている。 As shown in the figure, this optical disk pickup consists of a stationary part 1 and a movable lens barrel 2.
A lens 3, etc. is attached to the . This lens barrel 2
is a pair of parallel leaf springs 5a, 5 so that it can move only in one direction (left and right direction in the drawing) with respect to the movable frame 4.
b, and the movable pedestal 4 is further supported by the lens barrel 2.
A pair of parallel leaf springs 6a provided above and below so that they can move only in the direction of the axis (in the vertical direction in the figure),
6b.
静止部１は磁性材料よりなる磁気回路７を備
え、この磁気回路７には環状の磁気間隙７′が形
成されている。可動架台４にはこれを駆動するた
めに巻線８が設けられ、この巻線８は前記磁気間
隙７′内に配置されている。可動架台４は、この
巻線８に電流を流すことにより通常のラウドスピ
ーカの場合と同様に磁気回路７から受ける電磁力
により駆動制御される。 The stationary part 1 includes a magnetic circuit 7 made of a magnetic material, in which an annular magnetic gap 7' is formed. The movable frame 4 is provided with a winding 8 for driving it, and this winding 8 is arranged within the magnetic gap 7'. The movable pedestal 4 is driven and controlled by the electromagnetic force received from the magnetic circuit 7 in the same way as in the case of a normal loudspeaker by passing a current through the winding 8.
また、鏡筒２を駆動するため、鏡筒２の先端部
両側に１対の吸引鉄片９ａ，９ｂが設けられこれ
らに対向して１対の電磁石１０ａ，１０ｂが設け
られている。したがつて、これらの電磁石１０
ａ，１０ｂを付勢することにより、前記吸引鉄片
９ａ，９ｂとの磁気吸引力により鏡筒２が駆動制
御される。 Further, in order to drive the lens barrel 2, a pair of suction iron pieces 9a, 9b are provided on both sides of the tip of the lens barrel 2, and a pair of electromagnets 10a, 10b are provided opposite these. Therefore, these electromagnets 10
By energizing a and 10b, the lens barrel 2 is driven and controlled by the magnetic attraction force with the attraction iron pieces 9a and 9b.
このようにして鏡筒２を静止部１に対して光軸
の方向と光軸に直交する方向との２次元の相対的
駆動を行なわせることができる。 In this way, the lens barrel 2 can be driven relative to the stationary part 1 in two dimensions in the direction of the optical axis and in the direction orthogonal to the optical axis.
このような構造の場合、鏡筒２の運動性能を決
定する主要なものは板ばね５ａ，５ｂおよび６
ａ，６ｂであつて、特に光デイスク用ピツクアツ
プの場合には数ＫHzに及ぶ運動までを特性管理下
におく必要があるため、素材の品質管理、形状管
理を厳密に行なわなければならず、さらに高周波
領域での共振対策を必要とするなどの欠点があつ
た。
In such a structure, the main factors that determine the motion performance of the lens barrel 2 are the leaf springs 5a, 5b, and 6.
a, 6b, especially in the case of optical disk pick-ups, it is necessary to control the characteristics of motion up to several KHz, so the quality control and shape control of the material must be strictly controlled. It had drawbacks such as requiring countermeasures against resonance in the high frequency range.
この発明は上記の問題点を解決するためになさ
れたもので、鏡筒を非接触で外枠内に保持するこ
とができ、その制御を容易かつ的確に行ない得る
とともに素材の品質管理、形状管理および共振対
策を著しく簡略化することができる光デイスク用
ピツクアツプを提供することを目的とする。
This invention was made to solve the above-mentioned problems, and it is possible to hold the lens barrel within the outer frame without contact, and to control it easily and accurately, as well as to manage the quality and shape of the material. Another object of the present invention is to provide an optical disk pickup that can significantly simplify resonance countermeasures.
この発明は、外枠内に設けた磁性部材による磁
路と鏡筒側に設けた巻線との間に電磁力によるス
ラスト磁気軸受およびラジアル磁気軸受により外
枠に対してレンズを備えた鏡筒を非接触に保持
し、鏡筒の光軸の方向の制御と光軸に対して垂直
な方向の制御の２次元の制御を行なうことのでき
るものである。
This invention provides a lens barrel with a lens attached to the outer frame by a thrust magnetic bearing and a radial magnetic bearing by electromagnetic force between a magnetic path formed by a magnetic member provided in the outer frame and a winding provided on the lens barrel side. It is possible to perform two-dimensional control of the direction of the optical axis of the lens barrel and control of the direction perpendicular to the optical axis.
この発明によれば、外枠に対して鏡筒をスラス
ト磁気軸受およびラジアル磁気軸受により非接触
の状態で保持しているので、従来の板ばねを用い
た場合に比して素子の品質管理、形状管理あるい
は共振対策を簡略化することができる。また、ス
ラスト磁気軸受およびラジアル磁気軸受のそれぞ
れの巻線に加える電流を調節することにより鏡筒
の位置の制御を行なうものであるから、制御を容
易にしかも的確に行ない得る特長がある。
According to this invention, since the lens barrel is held in a non-contact state with respect to the outer frame by the thrust magnetic bearing and the radial magnetic bearing, the quality control of the element is easier than when using a conventional leaf spring. Shape management or resonance countermeasures can be simplified. Furthermore, since the position of the lens barrel is controlled by adjusting the currents applied to the respective windings of the thrust magnetic bearing and the radial magnetic bearing, there is an advantage that the control can be performed easily and accurately.
以下、図面を参照してこの発明の一実施例を説
明する。第２図ａ，ｂにおいて１１は筒状の外枠
で、この外枠１１に対してレンズ１２を備えた鏡
筒１３をスラスト磁気軸受１４およびラジアル磁
気軸受１５により非接触に保持している。
Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In FIGS. 2a and 2b, reference numeral 11 denotes a cylindrical outer frame, and a lens barrel 13 equipped with a lens 12 is held in a non-contact manner with respect to the outer frame 11 by a thrust magnetic bearing 14 and a radial magnetic bearing 15.
スラスト軸受１４は、外枠１１の下部内壁に環
状の磁性部材１６を固着し、この磁性部材１６の
一方の端面に磁気発生源例えば永久磁石１７を介
して、鍔付筒状の磁性部材１８を配設する。ま
た、図に示すように磁性部材１６の端面と磁性部
材１８の立上り部との間隙部に鏡筒１３のスラス
ト軸部１３ａに光軸に対して平行となるように巻
回した巻線１９を介在させる。 The thrust bearing 14 has an annular magnetic member 16 fixed to the inner wall of the lower part of the outer frame 11, and a flange-shaped cylindrical magnetic member 18 attached to one end surface of the magnetic member 16 via a magnetic source such as a permanent magnet 17. Arrange. Further, as shown in the figure, a winding 19 wound around the thrust shaft portion 13a of the lens barrel 13 so as to be parallel to the optical axis is provided in the gap between the end face of the magnetic member 16 and the rising portion of the magnetic member 18. intervene.
一方ラジアル磁気軸受１５は外枠１１の上部内
壁面に断面がＵ字形の外側磁路を形成する第１の
磁性部材２０を少なくとも３個図示例では第２図
ａに示すように周面に沿つて等間隔に４個配設す
る。そして、この第１の磁性部材２０の中間位置
より第２図ｂに示すように内側磁路を形成する第
２の磁性部材２１を磁気発生源例えば永久磁石２
２を介して第１の磁性部材２０を突設する。そし
て、第１の磁性部材２０と第２の磁性部材２１と
のそれぞれの対向面の少なくとも一方の面を所定
面積だけ突出させて磁束を集束させる磁極２１ａ
を形成する。図示例では第２の磁性部材２１の端
面を磁石２２の平面から突出させて磁極２１ａを
形成した。これにより、第１の磁性部材２０と第
２の磁性部材２１の磁極２１ａ面との間隙寸法
D1を第１の磁性部材２０と磁石２２との間隙寸
法D2に比べて小さく設定することができる。こ
の第２の磁性部材２２の磁極２１ａ面と対向する
第１の磁性部材２０との間隙部に光軸に対して垂
直となるように巻回された巻線２３を介在させ
る。この巻線２３は筒状に形成されたボビン２４
に巻回され、第１の磁性部材２０に対応する鏡筒
１３のラジアル軸部１３ｂの周面に沿つて等間隔
に配設される。このとき、ボビン２４に巻回され
た巻線２３の内側（鏡筒側）端が常に第２の磁性
部材２１の磁極２１ａ面上の磁路内に位置するよ
うに、また巻線２３の外側（外枠側）端が常に第
２の磁性部材２１の磁極２１ａの面上の磁路内よ
り外側に位置するように巻線部の長さと位置を設
定する。 On the other hand, the radial magnetic bearing 15 includes at least three first magnetic members 20 forming an outer magnetic path having a U-shaped cross section on the upper inner wall surface of the outer frame 11. In the illustrated example, as shown in FIG. Arrange 4 pieces at equal intervals. Then, from an intermediate position of the first magnetic member 20, as shown in FIG.
A first magnetic member 20 is provided protrudingly through 2. A magnetic pole 21a that focuses magnetic flux by protruding at least one of the opposing surfaces of the first magnetic member 20 and the second magnetic member 21 by a predetermined area.
form. In the illustrated example, the end surface of the second magnetic member 21 is made to protrude from the plane of the magnet 22 to form the magnetic pole 21a. As a result, the gap size between the magnetic pole 21a surface of the first magnetic member 20 and the second magnetic member 21
D1 can be set smaller than the gap dimension D2 between the first magnetic member 20 and the magnet 22. A winding 23 wound perpendicularly to the optical axis is interposed in the gap between the magnetic pole 21a surface of the second magnetic member 22 and the opposing first magnetic member 20. This winding 23 is connected to a bobbin 24 formed in a cylindrical shape.
and are arranged at equal intervals along the circumferential surface of the radial shaft portion 13b of the lens barrel 13 corresponding to the first magnetic member 20. At this time, the inside (lens barrel side) end of the winding 23 wound around the bobbin 24 is always located in the magnetic path on the magnetic pole 21a surface of the second magnetic member 21, and the outside of the winding 23 is The length and position of the winding portion are set so that the end (on the outer frame side) is always located outside the magnetic path on the surface of the magnetic pole 21a of the second magnetic member 21.
次にこの発明の作用を説明する。いま、各巻線
２３に外向きに力が作用するように所定の電流を
流すと、外枠１１に固着した第１の磁性部材２０
と第２の磁性部材２１とからなる磁気回路から受
ける電磁力により、鏡筒１３は外枠１１内の正規
の位置に保持される。この状態で鏡筒１３に外力
が加わり鏡筒１３の光軸が水平方向に偏心した場
合、当該方向の巻線２３が対応する第２の磁性部
材２１側に移動するため、磁力線を横切る巻線２
３の有効面積が減少し吸引力が弱まる。 Next, the operation of this invention will be explained. Now, when a predetermined current is passed through each winding 23 so that a force acts outward, the first magnetic member 20 fixed to the outer frame 11
The lens barrel 13 is held at a normal position within the outer frame 11 by the electromagnetic force received from the magnetic circuit consisting of the second magnetic member 21 and the second magnetic member 21 . In this state, if an external force is applied to the lens barrel 13 and the optical axis of the lens barrel 13 is eccentric in the horizontal direction, the winding 23 in that direction moves toward the corresponding second magnetic member 21, so the winding that crosses the lines of magnetic force 2
3's effective area decreases and the suction force weakens.
一方反対側の巻線２３は中心方向に引き寄せら
れるため、磁力線を横切る巻線２３の有効面積が
増加し、この増加分だけ吸引力が強まる。すなわ
ち、鏡筒１３が偏心した方向の巻線２３に作用す
る電磁力が弱まり、逆に反対側の巻線２３に作用
する電磁力がその分増大するため、鏡筒１３は対
向する巻線２３に作用する電磁力に差が生じる。
この電磁力の差により鏡筒１３の偏心量に応じた
復元力が発生し、鏡筒１３を正規の位置に復帰さ
せることができる。 On the other hand, since the winding 23 on the opposite side is attracted toward the center, the effective area of the winding 23 that crosses the lines of magnetic force increases, and the attractive force becomes stronger by this increase. That is, the electromagnetic force acting on the winding 23 in the direction in which the lens barrel 13 is eccentric is weakened, and conversely, the electromagnetic force acting on the winding 23 on the opposite side is increased by that amount, so that the lens barrel 13 is moved toward the opposite winding 23. There is a difference in the electromagnetic force acting on the
This difference in electromagnetic force generates a restoring force corresponding to the amount of eccentricity of the lens barrel 13, allowing the lens barrel 13 to return to its normal position.
また、外力により鏡筒１３の光軸が斜め方向例
えば右側に傾いた場合、右側上部の巻線２３は外
方向に移動するために磁力線を横切る有効断面積
が減少し右側上部の巻線２３に作用する電磁力が
弱まる。逆に右側下部の巻線２３は中心方向に移
動するため、磁力線を横切る有効断面積が増大し
右側下部の巻線２３に作用する電磁力が強まる。
一方左側上部の巻線２３は中心方向に移動するた
め、上述と同様に磁力線を横切る有効断面積が増
大し左側上部の巻線２３に作用する電磁力が強ま
る。また左側下部の巻線２３は外方向に移動する
ため、上述と同様に磁力線を横切る有効面積が減
少し左側下部の巻線２３に作用する電磁力が弱ま
る。これにより、鏡筒１３の回動に対して反対の
方向に回転トルクが発生し、鏡筒１３を正規の位
置に復帰させることができる。 Furthermore, when the optical axis of the lens barrel 13 is tilted diagonally, for example to the right, due to an external force, the winding 23 at the upper right side moves outward, so the effective cross-sectional area crossing the lines of magnetic force decreases, and the winding 23 at the upper right side moves outward. The acting electromagnetic force weakens. Conversely, since the winding 23 at the lower right side moves toward the center, the effective cross-sectional area crossing the lines of magnetic force increases, and the electromagnetic force acting on the lower right winding 23 increases.
On the other hand, since the winding 23 at the upper left side moves toward the center, the effective cross-sectional area crossing the lines of magnetic force increases and the electromagnetic force acting on the upper left winding 23 increases, as described above. Further, since the winding 23 at the lower left side moves outward, the effective area crossing the lines of magnetic force decreases, and the electromagnetic force acting on the lower left winding 23 weakens, as described above. This generates rotational torque in the direction opposite to the rotation of the lens barrel 13, allowing the lens barrel 13 to return to its normal position.
なお、鏡筒１３を光軸と直交する方向に移動さ
せる場合、所望方向の巻線２３の電流を増加すれ
ば巻線２３に作用する電磁力が増大し所望の方向
に鏡筒１３を移動させることができる。このと
き、反対側の巻線２３の電流を減少させると鏡筒
１３の駆動力は倍増する。 Note that when moving the lens barrel 13 in a direction perpendicular to the optical axis, increasing the current in the winding 23 in the desired direction increases the electromagnetic force acting on the winding 23 and moves the lens barrel 13 in the desired direction. be able to. At this time, if the current in the winding 23 on the opposite side is decreased, the driving force of the lens barrel 13 is doubled.
一方、鏡筒１３を光軸方向に移動させる必要が
あれば、従来例と同様に鏡筒１３のスラスト軸部
１３ａに巻回した巻線１９に流れる電流を加減す
ることにより、磁性部材１６，１８の磁気回路か
ら受ける電磁力により光軸方向に駆動制御するこ
とができる。 On the other hand, if it is necessary to move the lens barrel 13 in the optical axis direction, the magnetic member 16, Drive control in the optical axis direction can be performed by the electromagnetic force received from the 18 magnetic circuits.
したがつて、鏡筒１３のスラスト軸部１３ａを
スラスト磁気軸受１４て磁気的に保持するととも
に、鏡筒１３のラジアル軸部１３ｂに巻線２３を
少なくとも３個放射線状に配設し、これら巻線２
３を外枠に固着した磁気回路の磁路に直交する方
向に介在させ鏡筒１３のラジアル軸部１３ｂをラ
ジアル磁気軸受１５で磁気的に保持することによ
り、鏡筒１３を電磁力により非接触で外枠１１内
に保持することができるため、従来例において鏡
筒１３を保持するために必要であつた板ばねを全
て廃止することとができる。これにともない板ば
ねに起因して生じる諸問題を解決することができ
素材の品質管理、形状管理および高周波域での共
振対策を容易に行なうことができる。また、鏡筒
１３の偏倚量に応じて電磁力が増減し鏡筒１３に
復元力が働くため、鏡筒を常に正規の位置に保持
することができる。また、所望方向の巻線２３に
流す電流を調整することにより、電磁力を自在に
変えることができるため、鏡筒１３をその光軸と
直交する方向に駆動制御することができる。 Therefore, the thrust shaft portion 13a of the lens barrel 13 is magnetically held by the thrust magnetic bearing 14, and at least three windings 23 are arranged radially on the radial shaft portion 13b of the lens barrel 13. line 2
3 is interposed in a direction perpendicular to the magnetic path of a magnetic circuit fixed to the outer frame, and the radial shaft portion 13b of the lens barrel 13 is magnetically held by the radial magnetic bearing 15, so that the lens barrel 13 can be moved non-contact by electromagnetic force. Since the lens barrel 13 can be held within the outer frame 11, it is possible to eliminate all the leaf springs that were necessary to hold the lens barrel 13 in the conventional example. Accordingly, various problems caused by leaf springs can be solved, and material quality control, shape control, and resonance countermeasures in high frequency ranges can be easily carried out. Further, since the electromagnetic force increases or decreases depending on the amount of deflection of the lens barrel 13, and a restoring force acts on the lens barrel 13, the lens barrel can always be held in a normal position. Further, by adjusting the current flowing through the winding 23 in a desired direction, the electromagnetic force can be freely changed, so that the lens barrel 13 can be driven and controlled in a direction perpendicular to its optical axis.
次に、第３図乃至第５図によりこの発明の他の
実施例を説明する。 Next, another embodiment of the present invention will be described with reference to FIGS. 3 to 5.
第３図は、この発明の第２の実施例の要部であ
るラジアル磁気軸受を示す斜視図である。図にお
いて３１は有底矩形筒状に形成した第１の磁性部
材で、この第１の磁性部材３１の内部に内側磁路
を形成する第２の磁性部材３２を介在させる。そ
して、この第２の磁性部材３２を第１の磁性部材
３１の有底部に図示しない磁石を介して固着す
る。このとき、第１の磁性部材３１と第２の磁性
部材３２との間に所定寸法の間隙が設ける。この
間隙に矩形筒状のコイルボビン３３に巻回した巻
線３４を介在させる。このとき、巻線３４の内側
端が常に第２の磁性部材３２の磁極３２ａ面上の
磁路内に位置するように、また巻線３４の外側端
が常に第２の磁性部材３２の磁極３２ａ面上の磁
路内より外側に位置するように巻線部の長さと位
置を設定する。 FIG. 3 is a perspective view showing a radial magnetic bearing, which is a main part of a second embodiment of the invention. In the figure, reference numeral 31 denotes a first magnetic member formed in the shape of a rectangular cylinder with a bottom, and a second magnetic member 32 forming an inner magnetic path is interposed inside the first magnetic member 31 . Then, this second magnetic member 32 is fixed to the bottomed portion of the first magnetic member 31 via a magnet (not shown). At this time, a gap of a predetermined size is provided between the first magnetic member 31 and the second magnetic member 32. A winding wire 34 wound around a rectangular cylindrical coil bobbin 33 is interposed in this gap. At this time, the inner end of the winding 34 is always located in the magnetic path on the magnetic pole 32a surface of the second magnetic member 32, and the outer end of the winding 34 is always located on the magnetic pole 32a of the second magnetic member 32. The length and position of the winding section are set so that it is located outside the magnetic path on the surface.
したがつて、このような構成により上述と同様
の効果を挙げることができるとともに、巻線３４
を第１の磁性部材３１で囲むことにより、巻線３
４の電流を有効に利用することができる。 Therefore, with such a configuration, the same effects as described above can be achieved, and the winding 34
By surrounding the winding 3 with the first magnetic member 31,
4 current can be used effectively.
第４図は、この発明の第３の実施例の要部であ
るラジアル軸受を示す断面図である。図におい
て、４１は断面コ字形に形成した第１の磁性部材
で、この第１の磁性部材４１の先端部を突出させ
て磁極４１ａを形成する。そして、この第１の磁
性部材４１の有底部に磁石４２を介して第２の磁
性部材４３を固着する。このとき、第２の磁性部
材４３の端面を磁石４２の平面から突出させて磁
極４３ａを形成する。この第２の磁性部材４３の
磁極４３ａと第１の磁性部材４１の磁極４１ａと
の間隙寸法が第１の磁性部材４３と磁石４２との
間隙寸法に比べて小さくなるように設定される。
この磁極４１ａと４３ａとの間隙に有底筒状のコ
イルボビン４４に巻回された巻線４５を介在させ
る。この場合も上述と同様に巻線４５と磁路との
間に相対関係をもたせる。 FIG. 4 is a sectional view showing a radial bearing which is a main part of a third embodiment of the invention. In the figure, reference numeral 41 denotes a first magnetic member formed into a U-shape in cross section, and the tip of the first magnetic member 41 is made to protrude to form a magnetic pole 41a. Then, a second magnetic member 43 is fixed to the bottomed portion of the first magnetic member 41 via a magnet 42 . At this time, the end face of the second magnetic member 43 is made to protrude from the plane of the magnet 42 to form a magnetic pole 43a. The gap size between the magnetic pole 43a of the second magnetic member 43 and the magnetic pole 41a of the first magnetic member 41 is set to be smaller than the gap size between the first magnetic member 43 and the magnet 42.
A winding 45 wound around a bottomed cylindrical coil bobbin 44 is interposed in the gap between the magnetic poles 41a and 43a. In this case as well, a relative relationship is provided between the winding 45 and the magnetic path as described above.
したがつて、このような構成によれば上記実施
例と同様の効果を挙げることができるとともに、
第１の磁性部材４１と第２の磁性部材４３の磁極
面を突出させて設けることにより、磁束を集束さ
せることができ電磁力を大きくとりうるとともに
制御特性を向上させることができる。 Therefore, with such a configuration, it is possible to achieve the same effects as the above embodiment, and
By providing the magnetic pole faces of the first magnetic member 41 and the second magnetic member 43 in a protruding manner, the magnetic flux can be focused, the electromagnetic force can be increased, and the control characteristics can be improved.
第５図はこの発明の第４実施例の構成を示した
縦断面図である。なお、第５図において第２図と
同一部分には同一符号を付して説明を省略する。
図において５１は外側磁路を形成する断面がコ字
形の第１の磁性部５１ａと内側磁路を形成する第
２の磁性部５１ｂとをＥ字形に一体に形成した磁
性部材である。この磁性部材５１の第１の磁性部
５１ａと第２の磁性部５１ｂとの各対向面にそれ
ぞれ永久磁石５２ａ，５２ｂおよび５２ｃ，５２
ｄを対向させて設ける。そして、永久磁石５２
ａ，５２ｂおよび５２ｃ，５２ｄとの間隙部に第
２図と同様にコイルボビン２４に巻回された巻線
２３を介在させる。 FIG. 5 is a longitudinal sectional view showing the configuration of a fourth embodiment of the present invention. Note that in FIG. 5, the same parts as in FIG. 2 are designated by the same reference numerals, and explanations thereof will be omitted.
In the figure, reference numeral 51 denotes a magnetic member in which a first magnetic portion 51a having a U-shaped cross section forming an outer magnetic path and a second magnetic portion 51b forming an inner magnetic path are integrally formed in an E-shape. Permanent magnets 52a, 52b and 52c, 52 are provided on opposing surfaces of the first magnetic part 51a and the second magnetic part 51b of the magnetic member 51, respectively.
d are provided facing each other. And permanent magnet 52
The winding 23 wound around the coil bobbin 24 is interposed in the gap between the coil bobbin 24 and the coil bobbin 24 in the same way as shown in FIG. 2.
したがつて、このような構成によれば上記実施
例と同様の効果を挙げることができる。また、第
１の磁性部５１ａと第２の磁性部５１ｂとの対向
面に永久磁石５２ａ，５２ｂまたは５２ｃ，５２
ｄを配設することにより、磁束が均一化され電磁
力および復元力を効率よく発生させることができ
制御特性を著しく向上させることができる。 Therefore, with such a configuration, the same effects as those of the above embodiment can be achieved. Moreover, permanent magnets 52a, 52b or 52c, 52 are provided on the opposing surfaces of the first magnetic part 51a and the second magnetic part 51b.
By disposing d, the magnetic flux is made uniform, electromagnetic force and restoring force can be efficiently generated, and control characteristics can be significantly improved.
なお、この発明は上記実施例に限定されるもの
ではなく、要旨を変更しない範囲において種々変
形して実施することができる。 Note that the present invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications without changing the gist.
例えば上記実施例では磁気発生源として永久磁
石を用いたが、この発明はこれに限定されるもの
ではなくこれに換えて電磁石を用いることもでき
る。 For example, in the above embodiment, a permanent magnet is used as the magnetic generation source, but the present invention is not limited to this, and an electromagnet can also be used instead.
また、上記各実施例において、スラスト磁気軸
受およびラジアル磁気軸受の個々の巻線は同一方
向に巻回されたものを示したが、これを２分し流
れる電流の方向を逆にするか、あるいは同一方向
の電流を流す場合には逆向きに巻回して作用が逆
になるように構成し鏡筒の偏心の際に復元力を強
め安定な保持を行なわせるようにすることもでき
る。 Furthermore, in each of the above embodiments, the individual windings of the thrust magnetic bearing and the radial magnetic bearing are wound in the same direction. When current flows in the same direction, it is also possible to wind in opposite directions so that the action is reversed, so that when the lens barrel is eccentric, the restoring force is strengthened and stable holding is performed.
これを第４図に示す第３の実施例に対して適用
した場合を例示すれば、第６図の如くになる。す
なわち、Ａの領域の巻線とＢの領域の巻線とに逆
向きの電流が流れるようにすれば磁極４１ａと磁
極４３ａとの対向面両端において上記各実施例に
対し述べた効果を生ずることになる。 An example of the case where this is applied to the third embodiment shown in FIG. 4 is as shown in FIG. 6. That is, by allowing currents to flow in opposite directions to the windings in the region A and the windings in the region B, the effects described for each of the above embodiments can be produced at both ends of the opposing surfaces of the magnetic poles 41a and 43a. become.
第１図ａおよびｂは従来の光デイスク用ピツク
アツプの一例を示すものでａは平面図、ｂは鏡筒
の光軸に沿つて切断した縦断面図、第２図ａおよ
びｂはこの発明の一実施例を示すものでａは平面
図、ｂは鏡筒の光軸に沿つて切断した縦断面図、
第３図ないし第４図はこの発明の第２および第３
の実施例の要部を示す図で第３図は斜視図、第４
図は縦断面図、第５図ａ，ｂはこの発明の第４の
実施例を示す図でａは平面図、ｂは鏡筒の光軸に
沿つて切断した縦断面図、第６図は第３の実施例
の一変形を示す断面図である。
１…静止部、２…鏡筒、３…レンズ、４…可動
架台、５ａ，５ｂ…板ばね、６ａ，６ｂ…板ば
ね、７…磁気回路、７′…磁気間隙、８…巻線、
９ａ，９ｂ…吸引鉄片、１０ａ，１０ｂ…電磁
石、１１…外枠、１２…レンズ、１３…鏡筒、１
３ａ…スラスト軸部、１３ｂ…ラジアル軸部、１
４…スラスト磁気軸受、１５…ラジアル磁気軸
受、１６…磁性部材、１７…永久磁石、１８…磁
性部材、１９…巻線、２０…第１の磁性部材、２
１…第２の磁性部材、２１ａ…磁極、２２…磁
石、２３…巻線、２４…ボビン、３１…第１の磁
性部材、３２…第２の磁性部材、３２ａ…磁極、
３３…コイルボビン、３４…巻線、４１…第１の
磁性部材、４１ａ…磁極、４２…磁石、４３…第
２の磁性部材、４３ａ…磁極、４４…コイルボビ
ン、４５…巻線、５１…磁性部材、５１ａ…第１
の磁性部、５１ｂ…第２の磁性部、５２ａ〜５２
ｄ…永久磁石。
FIGS. 1a and 1b show an example of a conventional optical disk pickup, in which a is a plan view, b is a vertical sectional view taken along the optical axis of the lens barrel, and FIGS. One example is shown in which a is a plan view, b is a vertical cross-sectional view taken along the optical axis of the lens barrel,
Figures 3 and 4 show the second and third diagrams of this invention.
Figure 3 is a perspective view, Figure 4 is a perspective view, and Figure 4 is a perspective view.
The figure is a longitudinal sectional view, FIGS. 5a and 5b are diagrams showing a fourth embodiment of the invention, where a is a plan view, b is a longitudinal sectional view taken along the optical axis of the lens barrel, and FIG. FIG. 7 is a sectional view showing a modification of the third embodiment. DESCRIPTION OF SYMBOLS 1... Stationary part, 2... Lens barrel, 3... Lens, 4... Movable frame, 5a, 5b... Leaf spring, 6a, 6b... Leaf spring, 7... Magnetic circuit, 7'... Magnetic gap, 8... Winding wire,
9a, 9b... Attraction iron piece, 10a, 10b... Electromagnet, 11... Outer frame, 12... Lens, 13... Lens barrel, 1
3a... Thrust shaft part, 13b... Radial shaft part, 1
4... Thrust magnetic bearing, 15... Radial magnetic bearing, 16... Magnetic member, 17... Permanent magnet, 18... Magnetic member, 19... Winding wire, 20... First magnetic member, 2
1... Second magnetic member, 21a... Magnetic pole, 22... Magnet, 23... Winding wire, 24... Bobbin, 31... First magnetic member, 32... Second magnetic member, 32a... Magnetic pole,
33... Coil bobbin, 34... Winding wire, 41... First magnetic member, 41a... Magnetic pole, 42... Magnet, 43... Second magnetic member, 43a... Magnetic pole, 44... Coil bobbin, 45... Winding wire, 51... Magnetic member , 51a...first
magnetic part, 51b...second magnetic part, 52a to 52
d...Permanent magnet.
Claims (1)
鏡筒のスラスト軸部を外枠側に設けられ磁路を形
成する磁性部材と鏡筒側に設けた巻線との間の電
磁力により外枠に対して非接触に保持するスラス
ト磁気軸受と、前記外枠の内周面に沿つて少なく
とも３個等間隔に設けられ断面がＵ字形の外側磁
路を形成する第１の磁性部材と、この第１の磁性
部材の略中間部から突出して設けられ内側磁路を
形成する第２の磁性部材と、この第２の磁性部材
および前記第１の磁性部材の対向面の少なくとも
一方を所定面積だけ突出させて形成した磁極と、
前記第１の磁性部材および第２の磁性部材の少な
くとも一方に設けた磁気発生源と、前記鏡筒のラ
ジアル軸部に設けられるとともに第１の磁性部材
および第２の磁性部材の磁極間に磁束と交叉する
ように介挿された巻線とを具備したことを特徴と
する光デイスク用ピツクアツプ。 ２ 前記磁気発生源は永久磁石により構成された
ことを特徴とする特許請求の範囲第１項記載の光
デイスク用ピツクアツプ。 ３ 前記磁気発生源は電磁石により構成されたこ
とを特徴とする特許請求の範囲第１項記載の光デ
イスク用ピツクアツプ。 ４ 前記第１の磁性部材と第２の磁性部材との対
向面にそれぞれ永久磁石を突出させて磁極を形成
したことを特徴とする特許請求の範囲第１項記載
の光デイスク用ピツクアツプ。 ５ 前記第１の磁性部材は有底筒状に形成したこ
とを特徴とする特許請求の範囲第１項記載の光デ
イスク用ピツクアツプ。 ６ 前記巻線は中央で２分し、おのおのが第１お
よび第２の磁性部材によつて構成される磁気回路
に生じる電磁力が逆になるようにしたことを特徴
とする特許請求の範囲第１項記載の光デイスク用
ピツクアツプ。[Scope of Claims] 1. A cylindrical outer frame, a lens barrel provided with a lens, a thrust shaft portion of this lens barrel, a magnetic member provided on the outer frame side and forming a magnetic path, and a magnetic member provided on the lens barrel side. a thrust magnetic bearing that is held in a non-contact manner with respect to the outer frame by electromagnetic force between it and the winding; and at least three outer magnetic paths that are provided at equal intervals along the inner peripheral surface of the outer frame and have a U-shaped cross section. a first magnetic member forming an inner magnetic path; a second magnetic member protruding from a substantially intermediate portion of the first magnetic member forming an inner magnetic path; a magnetic pole formed by protruding at least one of the opposing surfaces of the member by a predetermined area;
A magnetic flux is generated between a magnetic generation source provided on at least one of the first magnetic member and the second magnetic member and magnetic poles of the first magnetic member and the second magnetic member provided on the radial shaft portion of the lens barrel. 1. A pick-up for an optical disk, comprising: a winding wire interposed so as to intersect with the winding wire. 2. The optical disk pickup according to claim 1, wherein the magnetic generation source is constituted by a permanent magnet. 3. The optical disk pickup according to claim 1, wherein the magnetic generation source is constituted by an electromagnet. 4. The optical disk pickup according to claim 1, wherein permanent magnets are respectively protruded from opposing surfaces of the first magnetic member and the second magnetic member to form magnetic poles. 5. The optical disk pick-up according to claim 1, wherein the first magnetic member is formed into a cylindrical shape with a bottom. 6. The winding is divided into two parts at the center so that the electromagnetic forces generated in the magnetic circuits each formed by the first and second magnetic members are opposite to each other. The pick-up for optical disks described in item 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP803082A JPS58125240A (en) | 1982-01-21 | 1982-01-21 | Pickup for optical disk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP803082A JPS58125240A (en) | 1982-01-21 | 1982-01-21 | Pickup for optical disk |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58125240A JPS58125240A (en) | 1983-07-26 |
| JPS6343816B2 true JPS6343816B2 (en) | 1988-09-01 |
Family
ID=11681935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP803082A Granted JPS58125240A (en) | 1982-01-21 | 1982-01-21 | Pickup for optical disk |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58125240A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5788534A (en) * | 1980-11-22 | 1982-06-02 | Matsushita Electric Ind Co Ltd | Controller for light converging position |
-
1982
- 1982-01-21 JP JP803082A patent/JPS58125240A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5788534A (en) * | 1980-11-22 | 1982-06-02 | Matsushita Electric Ind Co Ltd | Controller for light converging position |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58125240A (en) | 1983-07-26 |
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