JPS635809B2 - - Google Patents
Info
- Publication number
- JPS635809B2 JPS635809B2 JP4388182A JP4388182A JPS635809B2 JP S635809 B2 JPS635809 B2 JP S635809B2 JP 4388182 A JP4388182 A JP 4388182A JP 4388182 A JP4388182 A JP 4388182A JP S635809 B2 JPS635809 B2 JP S635809B2
- Authority
- JP
- Japan
- Prior art keywords
- voice coil
- braking oil
- liquid
- drive system
- electromagnetic drive
- 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
- 239000011358 absorbing material Substances 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 239000000696 magnetic material Substances 0.000 claims description 2
- 239000003921 oil Substances 0.000 description 11
- 238000010586 diagram Methods 0.000 description 5
- 239000010687 lubricating oil Substances 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000011553 magnetic fluid Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
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)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
- Optical Recording Or Reproduction (AREA)
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
Description
【発明の詳細な説明】
この発明は、ボイスコイル式電磁駆動系におけ
る制動用滑油量一定保持方法に係り、特に、ボイ
スコイルを吸液性物質で被着することにより、ボ
イスコイルの高速駆動時制動用滑油の量を一定に
保持するボイスコイル式電磁駆動系における制動
用滑油量一定保持方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for maintaining a constant amount of braking oil in a voice coil type electromagnetic drive system. The present invention relates to a method for maintaining a constant amount of braking oil in a voice coil type electromagnetic drive system for keeping the amount of braking oil constant.
従来、光ピツクアツプのアクチユエータ、スピ
ーカーその他の制御機器における電磁駆動系とし
て、いわゆるボイスコイル式電磁駆動系が用いら
れている。 Conventionally, a so-called voice coil type electromagnetic drive system has been used as an electromagnetic drive system for optical pickup actuators, speakers, and other control equipment.
その一例として、光ピツクアツプのアクチユエ
ータを第１図に基づいて説明すると、中空円柱状
の永久磁石１の下面に管フランジ状の磁性体２を
取り付けて、永久磁石１と磁性体２の間に磁気路
である空隙部３を形成し、空隙部３に円形のボイ
スコイル４を配置するものである。そして、ボイ
スコイル４は、対物レンズ５が装着されたレンズ
筒６から突設されたボイスコイル吊下円板７で吊
下支持され、またレンズ筒６は、上下の平行板バ
ネ８によつて、上下方向に自在に移動できるよう
に支持されている。そして、永久磁石１の磁束と
ボイスコイル４に流れる電流とは直交しているか
ら、フレミングの左手の法則によつて、可動部で
あるボイスコイル４が上下方向に力を受けて、レ
ンズ筒６ひいては対物レンズ５を上下方向に移動
させるものである。ここに、この空隙部３に滑油
を入れない状態だと、第２図に示すように、共振
ピークの大きな特性（実線）が得られるが、これ
では、共振周波数が温度変化等で少しずれた場
合、制御系が不安定となり、なるべく共振ピーク
の小さい特性（点線）のものが好ましい。そこ
で、第３図に示すように、制動用として、毛細管
現象を利用して保持される制動用滑油９例えば油
または磁気効率を向上させる効率を併せた磁性流
体を空隙部３とボイスコイル４の間に挿入してい
る。 As an example, an actuator for an optical pickup will be explained based on FIG. A cavity 3 is formed as a channel, and a circular voice coil 4 is disposed in the cavity 3. The voice coil 4 is suspended and supported by a voice coil suspension disc 7 that protrudes from a lens barrel 6 on which an objective lens 5 is attached, and the lens barrel 6 is supported by upper and lower parallel leaf springs 8. , supported so that it can move freely in the vertical direction. Since the magnetic flux of the permanent magnet 1 and the current flowing through the voice coil 4 are perpendicular to each other, according to Fleming's left hand rule, the voice coil 4, which is a movable part, receives a force in the vertical direction, and the lens barrel In turn, the objective lens 5 is moved in the vertical direction. If lubricating oil is not put into this cavity 3, a characteristic with a large resonance peak (solid line) will be obtained as shown in Figure 2, but in this case, the resonance frequency will shift slightly due to temperature changes, etc. In this case, the control system becomes unstable, so a characteristic (dotted line) with a resonance peak as small as possible is preferable. Therefore, as shown in FIG. 3, for braking purposes, a brake lubricating oil 9, such as oil or a magnetic fluid having an efficiency that improves magnetic efficiency, is applied to the air gap 3 and the voice coil 4. It is inserted between.
しかし、この従来技術において、低速駆動の場
合は、制動用滑油９が飛散することはないが、高
速駆動（振幅大および周波数大）の場合は、制動
用滑油９が外部例えば永久磁石１、磁性体２の上
面に飛散する。そして、これにより制動用滑油９
が不足すると、共振ピークが大きくなり制御系が
不安定になるという問題点があつた。 However, in this prior art, in the case of low-speed drive, the brake lubricant 9 does not scatter, but in the case of high-speed drive (large amplitude and high frequency), the brake lubricant 9 is placed outside, for example, by a permanent magnet 1. , scattered on the upper surface of the magnetic body 2. As a result, the braking oil 9
If there is a shortage, there is a problem that the resonance peak becomes large and the control system becomes unstable.
この発明は、このような従来技術の問題点に着
目してなされたもので、ボイスコイルを吸液性物
質で被着することによつて、上記問題点を解決す
ることを目的としている。 The present invention has been made in view of the problems of the prior art, and aims to solve the above problems by coating the voice coil with a liquid-absorbing material.
以下、この発明を図面に基づいて説明する。 The present invention will be explained below based on the drawings.
第４図は、この発明の一実施例を示す図であ
る。 FIG. 4 is a diagram showing an embodiment of the present invention.
１０は吸液性物質で、ボイスコイル４の両面お
よび下面に被着されている。吸液性物質１０とし
て、例えばフエルト、紙質の繊維状の厚さ0.1mm
以下のものを使用する。制動用滑油９を吸液性物
質１０に十分に吸い込ませ、かつ空隙部３にも充
填する。 Reference numeral 10 is a liquid-absorbing material that is adhered to both sides and the bottom surface of the voice coil 4. As the liquid-absorbing material 10, for example, felt or paper fiber with a thickness of 0.1 mm is used.
Use the following: The brake oil 9 is sufficiently sucked into the liquid-absorbing substance 10 and also filled into the void 3.
このように構成しておくと、ボイスコイル４が
高速駆動の場合に、たとえ空隙部３の制動用滑油
９が飛散しても、直ちにその飛散分は、吸液性物
質１０から補填されるとともに飛散した制動用滑
油９は吸液性物質１０に吸収されてしまう。した
がつて、空隙部３における制動用滑油９の量は常
に一定に保持されている。 With this configuration, even if the braking oil 9 in the cavity 3 is scattered when the voice coil 4 is driven at high speed, the scattered amount is immediately compensated for by the liquid-absorbing substance 10. At the same time, the brake lubricating oil 9 scattered is absorbed by the liquid-absorbing substance 10. Therefore, the amount of brake oil 9 in the cavity 3 is always kept constant.
以上説明してきたように、この発明は、ボイス
コイルを吸液性物質で被着することによつて、空
隙部における制動用滑油の量を常に保持すること
ができるので、共振ピークを小さくでき、制御系
の安定を図ることができるという効果が得られ
る。 As explained above, in this invention, by coating the voice coil with a liquid-absorbing material, the amount of braking oil in the gap can be maintained at all times, so the resonance peak can be reduced. , the effect of stabilizing the control system can be obtained.
第１図は光ピツクアツプにおけるボイスコイル
式電磁駆動系を説明する図、第２図は周波数と利
得との関係を示す図、第３図は空隙部に制動用滑
油を入れた図、第４図は、この発明の一実施例を
示す断面図である。
１……永久磁石、２……磁性体、３……空隙
部、４……ボイスコイル、５……対物レンズ、６
……レンズ筒、７……ボイスコイル吊下円板、８
……平行板バネ、９……制動用滑油、１０……吸
液性物質。
Fig. 1 is a diagram explaining the voice coil type electromagnetic drive system in an optical pickup, Fig. 2 is a diagram showing the relationship between frequency and gain, Fig. 3 is a diagram showing braking oil in the cavity, and Fig. 4 is a diagram showing the relationship between frequency and gain. The figure is a sectional view showing an embodiment of the present invention. 1... Permanent magnet, 2... Magnetic material, 3... Air gap, 4... Voice coil, 5... Objective lens, 6
...Lens barrel, 7...Voice coil hanging disk, 8
... Parallel plate spring, 9 ... Braking oil, 10 ... Liquid-absorbing material.
Claims (1)
路である空隙部と、該空隙部に配置されたボイス
コイルとの間に制動用滑油を充填したボイスコイ
ル式電磁駆動系において、ボイスコイルを吸液性
物質で被着することにより、ボイスコイルの高速
駆動時制動用滑油の量を一定に保持するボイスコ
イル式電磁駆動系における制動用滑油量一定保持
方法。1. In a voice coil type electromagnetic drive system in which a braking oil is filled between a gap, which is a magnetic path formed by a permanent magnet and a magnetic material, and a voice coil disposed in the gap, the voice A method for maintaining a constant amount of braking oil in a voice coil electromagnetic drive system by coating the coil with a liquid-absorbing material to maintain a constant amount of braking oil during high-speed drive of the voice coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4388182A JPS58161147A (en) | 1982-03-19 | 1982-03-19 | Method for keeping braking lubricating oil quantity constant, in voice coil type electromagnetic driving system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4388182A JPS58161147A (en) | 1982-03-19 | 1982-03-19 | Method for keeping braking lubricating oil quantity constant, in voice coil type electromagnetic driving system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58161147A JPS58161147A (en) | 1983-09-24 |
| JPS635809B2 true JPS635809B2 (en) | 1988-02-05 |
Family
ID=12676042
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4388182A Granted JPS58161147A (en) | 1982-03-19 | 1982-03-19 | Method for keeping braking lubricating oil quantity constant, in voice coil type electromagnetic driving system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58161147A (en) |
-
1982
- 1982-03-19 JP JP4388182A patent/JPS58161147A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58161147A (en) | 1983-09-24 |
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