JPS58123705A - Electromagnetic driving apparatus - Google Patents

Electromagnetic driving apparatus

Info

Publication number
JPS58123705A
JPS58123705A JP57006644A JP664482A JPS58123705A JP S58123705 A JPS58123705 A JP S58123705A JP 57006644 A JP57006644 A JP 57006644A JP 664482 A JP664482 A JP 664482A JP S58123705 A JPS58123705 A JP S58123705A
Authority
JP
Japan
Prior art keywords
soft iron
magnetic circuit
magnet
drive device
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.)
Granted
Application number
JP57006644A
Other languages
Japanese (ja)
Other versions
JPS6041444B2 (en
Inventor
Haruhisa Takiguchi
治久 瀧口
Yukio Kurata
幸夫 倉田
Kaneki Matsui
完益 松井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sharp Corp filed Critical Sharp Corp
Priority to JP57006644A priority Critical patent/JPS6041444B2/en
Publication of JPS58123705A publication Critical patent/JPS58123705A/en
Publication of JPS6041444B2 publication Critical patent/JPS6041444B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
    • H02K41/02—Linear motors; Sectional motors
    • H02K41/035—DC motors; Unipolar motors
    • H02K41/0352—Unipolar motors
    • H02K41/0354—Lorentz force motors, e.g. voice coil motors
    • H02K41/0356—Lorentz force motors, e.g. voice coil motors moving along a straight path

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Electromagnets (AREA)
  • Mechanical Optical Scanning Systems (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To reduce the mass and volume of a magnetic circuit and to make the magnetic circuit narrow by a method wherein the magnetic circuit is formed in such a manner that the magnetic edge of a permanent magnet is set parallel with the direction in which a driven object is moved. CONSTITUTION:A solenoid coil 3 is provided on the periphery of a driven object 2. The coil 3 is arranged in between first cylindrical soft iron 7 and second cylindrical soft iron 8. A magnetic circuit is composed of the soft iron 7 and soft iron 8 which make contact with a permanent magnet 9. The magnet 9 has been magnetized in the radial direction and a portion equivalent to the sectional area Am of the magnet is a circumferential area of the magnet 9. The area can be controlled freely by changing the height of the cylinder without changing the external circumferential diameter. Accordingly, it is possible to set the flux density Bg larger by increasing the height of the cylinder.

Description

【発明の詳細な説明】 本発明は電磁力を利用して物体を移動せしめる電磁駆動
装置に関し、特に物体に固着したソレノイドコイルを磁
気回路内に挿入してこのソレノイドコイルに通電するこ
とによジローレンツ電磁力を駆動力として発生させる電
磁駆動装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic drive device that uses electromagnetic force to move an object, and particularly to an electromagnetic drive device that uses electromagnetic force to move an object. This invention relates to an electromagnetic drive device that generates Lorentz electromagnetic force as a driving force.

このような電磁駆動装置はスピーカに使用される他、光
学式メモリーディスクの再生ピックアップ装置にも応用
されている。即ち、光学式メモリーディスクから記録情
報を再生する際にはディスクの回転によるディスク記録
面の上下及び横方向の変動に追従して常にピックアップ
系を駆ｕノすることが必要となるが、この時の駆動手段
として電磁駆動装置が利用される。In addition to being used in speakers, such electromagnetic drive devices are also applied to playback pickup devices for optical memory disks. That is, when reproducing recorded information from an optical memory disk, it is necessary to constantly drive the pickup system to follow the vertical and horizontal fluctuations of the disk recording surface due to the rotation of the disk. An electromagnetic drive device is used as the drive means.

ピックアップ系の電磁駆動装置として要求される特性は
次の如きものである。The characteristics required for an electromagnetic drive device for a pickup system are as follows.

（１）ピックアップ装置全体の質量の軽減化のため質量
及び体積ともに小さいこと。(1) Both mass and volume are small in order to reduce the mass of the entire pickup device.

（２）ディスク内周側の読取り可能な範囲を極力拡大す
るため、ピックアップ系の幅（ディスク回転半径方向に
対応）は狭いことが望ましく、従ってこれに取付けられ
る電磁駆動装置もその幅が狭いことが望ましい。(2) In order to expand the readable range on the inner circumference of the disk as much as possible, it is desirable that the width of the pickup system (corresponding to the disk rotation radius direction) be narrow, and therefore the electromagnetic drive device attached to it should also be narrow. is desirable.

第１図は従来より使用されている電磁駆動装置の構成断
面図である。弾性支持体１に支持された駆動物体２の外
周囲にはソレノイドコイル３が周設され、このソレノイ
ドコイル３はヨークプレート４とセンターヨーク５の間
隙に配置されている。FIG. 1 is a sectional view of the structure of a conventionally used electromagnetic drive device. A solenoid coil 3 is disposed around the outer periphery of a driving object 2 supported by an elastic support 1, and this solenoid coil 3 is disposed in a gap between a yoke plate 4 and a center yoke 5.

ｔたヨークプレート４とセンターヨーク５は永久磁石６
に接触して磁気回路を形成している。永久磁石６は紙面
の上下方向に着磁されておシ、ソレノイドコイル３に通
電することによシ発生する磁気駆動力で駆動物体２は弾
性支持体ｌの可動範囲内を移送される。ソレノイドコイ
ル３の挿入されている磁気ギャップの磁束密度Ｂ２は次
式で与えられる。The yoke plate 4 and center yoke 5 are made up of permanent magnets 6.
in contact to form a magnetic circuit. The permanent magnet 6 is magnetized in the vertical direction of the plane of the paper, and the driven object 2 is transported within the movable range of the elastic support 1 by the magnetic driving force generated by energizing the solenoid coil 3. The magnetic flux density B2 of the magnetic gap in which the solenoid coil 3 is inserted is given by the following equation.

上式よシ明らかな如く、ＢｇはＡｍに比例するので磁石
断面積（第１図のリング状永久磁石５に於いてはリング
の底面積に相当する）は大きく設定することか必要とな
る。このため、第１図に示す如き構造の電磁駆動装置に
於いてはその幅即ち直径に相当する長さを小さくするこ
とが困難であった。またヨークプレート３及びセンター
ヨーク４の体積も大きく駆動装置全体としてもその体積
及び質量を減少させることができないのが実情である。As is clear from the above equation, since Bg is proportional to Am, it is necessary to set the magnet cross-sectional area (corresponding to the bottom area of the ring in the ring-shaped permanent magnet 5 in FIG. 1) to be large. For this reason, it has been difficult to reduce the width, that is, the length corresponding to the diameter, of the electromagnetic drive device having the structure shown in FIG. In addition, the volumes of the yoke plate 3 and center yoke 4 are large, and the reality is that the volume and mass of the drive device as a whole cannot be reduced.

本発明は技術的手段を駆使することにより上記欠点を克
服した小型軽量化が可能な電磁駆動装置を提供すること
を目的とするものである。An object of the present invention is to provide an electromagnetic drive device that overcomes the above drawbacks and can be made smaller and lighter by making full use of technical means.

以下、本発明を実施例に従って図面を参照しながら詳説
する。Hereinafter, the present invention will be explained in detail according to embodiments with reference to the drawings.

第２図は本発明の１実施例を示す電磁駆動装置の構成断
面図である。FIG. 2 is a sectional view of the structure of an electromagnetic drive device showing one embodiment of the present invention.

第１図同様駆動物体２は弾性支持体（図示せず）に支持
されその外周囲にはソレノイドコイル３が周設されてい
る。このソレノイドコイル３け第１図のヨークプレート
４に対応する第１の円筒状軟鉄７と、同様にセンターヨ
ーク５に対応する第２の円筒状軟鉄８との間に配置され
ている。また第１の円筒状軟鉄７と第２の円筒状軟鉄８
は円筒状永久磁石９に接触して磁気回路を形成している
。As in FIG. 1, the driving object 2 is supported by an elastic support (not shown), and a solenoid coil 3 is provided around its outer periphery. The three solenoid coils are arranged between a first cylindrical soft iron 7 corresponding to the yoke plate 4 in FIG. 1 and a second cylindrical soft iron 8 corresponding to the center yoke 5. Also, a first cylindrical soft iron 7 and a second cylindrical soft iron 8
contacts the cylindrical permanent magnet 9 to form a magnetic circuit.

円筒状永久磁石９はその半径方向に着磁されており、従
って磁石断面積Ａｍに相当する部分は円筒状永久磁石９
の円周面積である。この面積は円筒の高さを変えること
によシ外周径を変化させることなく任意に制御すること
ができる。従って円筒の高さを高くすることにより磁束
密度Ｂｇを大きく設定することが可能となる。The cylindrical permanent magnet 9 is magnetized in its radial direction, so the portion corresponding to the magnet cross-sectional area Am is the cylindrical permanent magnet 9.
is the circumferential area of This area can be arbitrarily controlled by changing the height of the cylinder without changing the outer diameter. Therefore, by increasing the height of the cylinder, it is possible to set a large magnetic flux density Bg.

第３図は本発明の他の実施例を示す電磁駆動装置の構成
斜視図である。FIG. 3 is a perspective view of the configuration of an electromagnetic drive device showing another embodiment of the present invention.

本実施例に於いては、駆動物体２の外周に設けられるソ
レノイドコイルｉｏａ矩形のコイルに成形されている。In this embodiment, the solenoid coil provided around the outer periphery of the driving object 2 is formed into a rectangular coil.

このソレノイドコイル１０の両側部にはそれぞれコの字
形の軟鉄ヨーク１１が配置され、ソレノイドコイル１０
はこの軟鉄ヨーク１１の一方の突起壁に両側部が架設さ
れている。U-shaped soft iron yokes 11 are arranged on both sides of the solenoid coil 10, respectively.
Both sides of the soft iron yoke 11 are constructed on one protruding wall of the soft iron yoke 11.

軟鉄ヨーク１１の他方の突起壁にはそれぞれソレノイド
コイル１０に対向して板状の永久磁石１２が固設されて
いる。永久磁石１２Ｉｉ図中に矢印で示す如く、ソレノ
イドコイル１０を貫通する方向に着磁されており、セン
ターヨークを介することなく直接ソレノイドコイルＩＯ
Ｋ対面して磁力線を付与しており、磁気回路の幅が狭く
なる。また着磁方向に直交する方向には磁力線が存在し
ないのでこの方向の幅は更に小さくすることができる。A plate-shaped permanent magnet 12 is fixed to the other protruding wall of the soft iron yoke 11, facing the solenoid coil 10, respectively. As shown by the arrow in the figure, the permanent magnet 12Ii is magnetized in the direction that penetrates the solenoid coil 10, and directly connects the solenoid coil IO without going through the center yoke.
The magnetic lines of force are applied facing each other, making the width of the magnetic circuit narrower. Furthermore, since there are no lines of magnetic force in the direction perpendicular to the magnetization direction, the width in this direction can be further reduced.

尚、第２図の実施例に於いても円筒状永久磁石９の磁石
断面積をギャップ断面積程度に設定することが可能であ
れば第２の円筒状軟鉄８を省くことができる。In the embodiment shown in FIG. 2 as well, the second cylindrical soft iron 8 can be omitted if the magnet cross-sectional area of the cylindrical permanent magnet 9 can be set to about the gap cross-sectional area.

以上詳説した如く、本発明の電磁駆動装置は、永久磁石
の磁極端面が駆動物体の移動方向と平行になるように磁
気回路を構成しておシ、磁気回路の質量、体積を減少す
ることが可能であり磁気回路の幅の狭小化を達成するこ
とができる。As explained in detail above, in the electromagnetic drive device of the present invention, the magnetic circuit is configured such that the magnetic pole end face of the permanent magnet is parallel to the moving direction of the driven object, and the mass and volume of the magnetic circuit can be reduced. This makes it possible to narrow the width of the magnetic circuit.

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

第１図は従来の電磁駆動装置の構成断面図である。 第２図は本発明の１実施例を示す電磁駆動装置の構成断
面図である。 第３図は本発明の他の実施例を示す電磁駆動装置の構成
斜視図である、。 ４、彎駆動物体、　　３，１０・・・ソレノイドコイル
、７・・・第１の円筒状軟鉄、　８・・・第２の円筒状
軟鉄、９・・・円筒状永久磁石、　１１・・・軟鉄ヨー
ク、１２・・・永久磁石。FIG. 1 is a sectional view of a conventional electromagnetic drive device. FIG. 2 is a sectional view of the structure of an electromagnetic drive device showing one embodiment of the present invention. FIG. 3 is a perspective view of the configuration of an electromagnetic drive device showing another embodiment of the present invention. 4. Curved driving object, 3, 10... Solenoid coil, 7... First cylindrical soft iron, 8... Second cylindrical soft iron, 9... Cylindrical permanent magnet, 11... Soft iron yoke, 12...Permanent magnet.

Claims (1)

【特許請求の範囲】[Claims] １、磁気回路を構成する磁石と、前記磁気回路内に配設
されかつ駆動物体に連結されたソレノイドコイルとを具
備して成る電磁駆動装置に於いて、前記磁石の磁極端面
を前記ソレノイドコイルの移動方向と平行に配置したこ
とを特徴とする電磁駆動装置。1. In an electromagnetic drive device comprising a magnet constituting a magnetic circuit and a solenoid coil disposed within the magnetic circuit and connected to a driving object, the magnetic pole end face of the magnet is connected to the solenoid coil. An electromagnetic drive device characterized by being arranged parallel to a direction of movement.
JP57006644A 1982-01-18 1982-01-18 electromagnetic drive device Expired JPS6041444B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57006644A JPS6041444B2 (en) 1982-01-18 1982-01-18 electromagnetic drive device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57006644A JPS6041444B2 (en) 1982-01-18 1982-01-18 electromagnetic drive device

Publications (2)

Publication Number Publication Date
JPS58123705A true JPS58123705A (en) 1983-07-23
JPS6041444B2 JPS6041444B2 (en) 1985-09-17

Family

ID=11644074

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57006644A Expired JPS6041444B2 (en) 1982-01-18 1982-01-18 electromagnetic drive device

Country Status (1)

Country Link
JP (1) JPS6041444B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0190763A2 (en) * 1985-02-08 1986-08-13 Mitsubishi Denki Kabushiki Kaisha Data converter pickup carriage assembly

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS504241A (en) * 1973-05-11 1975-01-17
JPS51363A (en) * 1974-06-20 1976-01-06 Mansei Kogyo Kk
JPS5149419U (en) * 1974-10-12 1976-04-14
JPS55125073A (en) * 1979-03-20 1980-09-26 Toshiba Corp Actuator driving coil motor
JPS5634153A (en) * 1979-08-29 1981-04-06 Nippon Telegr & Teleph Corp <Ntt> Automatic focus adjuster
JPS5774836A (en) * 1980-10-24 1982-05-11 Sony Corp Pickup device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5149419B2 (en) * 1972-07-01 1976-12-27

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS504241A (en) * 1973-05-11 1975-01-17
JPS51363A (en) * 1974-06-20 1976-01-06 Mansei Kogyo Kk
JPS5149419U (en) * 1974-10-12 1976-04-14
JPS55125073A (en) * 1979-03-20 1980-09-26 Toshiba Corp Actuator driving coil motor
JPS5634153A (en) * 1979-08-29 1981-04-06 Nippon Telegr & Teleph Corp <Ntt> Automatic focus adjuster
JPS5774836A (en) * 1980-10-24 1982-05-11 Sony Corp Pickup device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0190763A2 (en) * 1985-02-08 1986-08-13 Mitsubishi Denki Kabushiki Kaisha Data converter pickup carriage assembly

Also Published As

Publication number Publication date
JPS6041444B2 (en) 1985-09-17

Similar Documents

Publication Publication Date Title
KR0133859B1 (en) Objective lens driving device in an optical pick up
US4409630A (en) Information signal recording and/or reproducing apparatus and a recording jacket for use therewith
US4669013A (en) Multiple coils for reduction of stray magnetic fields in disk file actuators
JPH0266739A (en) Optical pickup device
US4462054A (en) Disc drive electromagnetic actuator with enhanced flux density
US3723779A (en) Compensated linear motor
US4661729A (en) Voice coil motor magnet assembly
JPS58123705A (en) Electromagnetic driving apparatus
US4233476A (en) Moving coil type cartridge
JPS6139241A (en) Objective lens driver
JPH08221860A (en) Disk clamp mechanism
JP2700005B2 (en) Objective lens drive
JPH1027361A (en) Objective lens drive unit
JP2645079B2 (en) Magnetic head drive
JPS61287048A (en) Optical system driver
JPH0574071A (en) Magnetic circuit for magnetic head driving device
JPH04310653A (en) Optical disk driving device
JPS6222246A (en) Interior magnetic type actuator optical head
JPS58185036A (en) Optical pickup
JPS60138741A (en) Objective lens driver
JPH03178546A (en) Voice coil motor
JPH035934A (en) Objective lens driving device
JPH07110955A (en) Objective lens drive apparatus
JPS62298006A (en) Vertical magnetic recording and reproducing head
JPS6343816B2 (en)