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JPH03242831A - Objective lens driver - Google Patents

Objective lens driver

Info

Publication number
JPH03242831A
JPH03242831A JP3915590A JP3915590A JPH03242831A JP H03242831 A JPH03242831 A JP H03242831A JP 3915590 A JP3915590 A JP 3915590A JP 3915590 A JP3915590 A JP 3915590A JP H03242831 A JPH03242831 A JP H03242831A
Authority
JP
Japan
Prior art keywords
yoke
magnet
objective lens
lens holder
attached
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.)
Pending
Application number
JP3915590A
Other languages
Japanese (ja)
Inventor
Yasushi Nawata
縄田 康
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP3915590A priority Critical patent/JPH03242831A/en
Publication of JPH03242831A publication Critical patent/JPH03242831A/en
Pending legal-status Critical Current

Links

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  • Optical Recording Or Reproduction (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)

Abstract

PURPOSE:To suppress vibration to be generated in a yoke, and to stabilize the frequency characteristic of a lens holder by attaching a non-magnetic metallic block to a gap between a bent part located at the bottom of the errection part of the yoke and a magnet. CONSTITUTION:The non-magnetic metallic block 7 is attached to a gap between the bottom of the bent part of the yoke 1 and the magnet 2. Namely, the metal lic block 7 becomes the bottom reinforcing member of the bent part of the yoke, and it can suppress the vibration of the yoke 1 around the fulcrum of the bent part. Besides, since the metallic block 7 is bonded to the magnet 2 extending over its whole length (l), it can suppress the force of a sort of twisting force consisting of reaction forces F'1N and F'2N. Thus, the disturbance of gain and a phase on the frequency characteristic of the lens holder can be kept small.

Description

【発明の詳細な説明】 [産業上の利用分野コ この発明は、光ピツクアップにおける対物レンズを駆動
する対物レンズ駆動装置に関し、特にその磁気回路の構
造の改善に関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an objective lens driving device for driving an objective lens in an optical pickup, and particularly relates to an improvement in the structure of its magnetic circuit.

[従来の技術] 第8図は従来の対物レンズ駆動装置を示す断面図である
[Prior Art] FIG. 8 is a sectional view showing a conventional objective lens driving device.

図において(1)はヨーク、(2)はヨーク(1)に取
付けたマグネット、(3)はヨーク(1)の中央部に起
立して取付けたシャフト、(4)はシャフト(3)の周
囲に回転及び摺動自在に取付けたレンズホルダ、(5)
はレンズホルダ(4)に取付けた対物レンズ、(6)は
レンズホルダ(4)の周囲にマグネット(2)と対向し
て取付けたコイルである。ヨーク(1)とマグネット(
2)により磁気回路が構成される。またレンズホルダ(
4)及び対物レンズ(5)はシャフト(3)に沿って上
下方向(フォーカス方向)及び回転方向(+−ラッキン
グ方向)に可動する。
In the figure, (1) is the yoke, (2) is the magnet attached to the yoke (1), (3) is the shaft attached to the center of the yoke (1), and (4) is the circumference of the shaft (3). A lens holder rotatably and slidably attached to the (5)
(6) is an objective lens attached to the lens holder (4), and (6) is a coil attached to the periphery of the lens holder (4) facing the magnet (2). Yoke (1) and magnet (
2) constitutes a magnetic circuit. Also, the lens holder (
4) and the objective lens (5) are movable along the shaft (3) in the vertical direction (focusing direction) and rotational direction (+-racking direction).

第10図はレンズホルダ4を回転方向に可動するための
マグネット(2)とコイル(6)の配置を示している。
FIG. 10 shows the arrangement of a magnet (2) and a coil (6) for moving the lens holder 4 in the rotational direction.

次に動作について説明する。Next, the operation will be explained.

第10図の様にマグネット(2)の磁極を配置させ、し
かも図の向きにコイル(6)への通電を行った場合を考
える。なお通電方向○は紙面の裏から表へまた■は紙面
の表から裏へ流す向きとする。この場合、電流と磁束に
よりフレミングの左手の法則が成り立ち、駆動力Fが働
く。すなわち、点AのコイルにはF l 、点Bのコイ
ルにはF2の力が働き、レンズホルダー(4)をシャフ
ト(3)を中心として時計方向に回転せしめることがで
きる。同様にして通電方向を逆にするとレンズホルダ(
4)を反時計方向に回転せしめる。
Consider the case where the magnetic poles of the magnet (2) are arranged as shown in FIG. 10, and the coil (6) is energized in the direction shown in the figure. Note that the current direction ○ is from the back of the paper to the front, and the symbol ■ is from the front to the back of the paper. In this case, Fleming's left-hand rule holds true due to the current and magnetic flux, and a driving force F acts. That is, a force F l acts on the coil at point A and a force F2 acts on the coil at point B, making it possible to rotate the lens holder (4) clockwise about the shaft (3). Similarly, if you reverse the current direction, the lens holder (
4) Rotate counterclockwise.

[発明が解決しようとする課題] 従来の対物レンズ駆動装置は以上のように構成されてい
るので、第10図を見るとわかるように、コイル(6)
に生じる駆動F1、F2は、レンズホルダ(4)に対す
る実際の回転力F+(r)、F2  (r)と、これと
直交する方向に垂直力F1(N) 、F2  (N)が
発生する。・そしてこの垂直力F +  (N) 、F
 2  (N)がマグネット(2)に対する反力F′、
(N)、F−2(N)として作用し、マグネット(2)
およびヨーク(1)に対する振動源になっている。
[Problems to be Solved by the Invention] Since the conventional objective lens drive device is configured as described above, as can be seen from FIG.
The drives F1 and F2 generated in the lens holder (4) generate actual rotational forces F+(r) and F2(r) on the lens holder (4), and vertical forces F1(N) and F2(N) in a direction orthogonal thereto.・And this vertical force F + (N), F
2 (N) is the reaction force F′ against the magnet (2),
(N), acts as F-2 (N), magnet (2)
and serves as a vibration source for the yoke (1).

このためヨーク(1)が固有振動領域で振動し、そのゲ
インと位相の周波数特性は第9図(a)、(b)のよう
になる。
Therefore, the yoke (1) vibrates in the natural vibration region, and its gain and phase frequency characteristics are as shown in FIGS. 9(a) and 9(b).

従って同図よりレンズホルダ(4)の周波数特性上ゲイ
ンと位相に大きな乱れを与えるという課題があった。
Therefore, as shown in the figure, there was a problem in that the frequency characteristics of the lens holder (4) caused large disturbances in the gain and phase.

発明の目的 この発明は上記のような課題を解消するためになされた
もので、マグネットに対する反力F′(N) 、F −
2(N)が加えられてもマグネット、ヨークの振動を抑
え、レンズホルダの周波数特性上にゲインと位相の乱れ
を十分小さくできる対物レンズ駆動装置を提供すること
を目的とする。
Purpose of the Invention This invention was made to solve the above-mentioned problems.
It is an object of the present invention to provide an objective lens driving device that can suppress vibrations of a magnet and a yoke even when 2 (N) is applied, and can sufficiently reduce disturbances in gain and phase on the frequency characteristics of a lens holder.

[課題を解決するための手段] この発明に係る対物レンズ駆動装置は、ヨークの立設部
の根元にあたる折曲げ部とマグネットとの隙間に非磁性
の金属ブロックを取付けたものである。
[Means for Solving the Problems] An objective lens driving device according to the present invention has a non-magnetic metal block attached to a gap between a bent portion corresponding to the root of an upright portion of a yoke and a magnet.

[作用] この発明における非磁性の金属ブロックは、マグネット
と連結して、ヨーク立設部の根元の折曲げ部に取付けら
れるので、ヨーク折曲げ部の根元補強材となり、ヨーク
の振動を抑える。
[Function] The non-magnetic metal block of the present invention is connected to a magnet and attached to the bent portion at the root of the yoke upright portion, so it serves as a reinforcing material for the root of the yoke bent portion and suppresses vibration of the yoke.

[実施例] 以下、この発明の一実施例を第1図乃至第3図に基づい
て説明する。
[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

第1図、第2図において、(1)から(5)は第8図と
同様の部材である。(7)は非磁性の金属ブロックであ
り、その3つ面、すなわち(7a)、(7b)、(7C
)に接着剤(8)を塗布しヨーク(1)の折曲げ部の根
元と、マグネット(2)の隙間に挿入し、接着硬化させ
る。
In FIGS. 1 and 2, (1) to (5) are the same members as in FIG. 8. (7) is a non-magnetic metal block, and its three faces are (7a), (7b), and (7C).
) is applied with adhesive (8) and inserted into the gap between the bent part of the yoke (1) and the magnet (2), and the adhesive is cured.

更に金属ブロック(7)の(7d)の面とヨーク(1)
の面との隙間に接着剤(8)を塗布し接着硬化させる。
Furthermore, the surface (7d) of the metal block (7) and the yoke (1)
Apply adhesive (8) to the gap between the surface and the surface and allow the adhesive to harden.

これによりヨーク(1)の折曲げ部の根元とマグネット
(2)の隙間に金属ブロック(7)を取付ける。
As a result, the metal block (7) is attached to the gap between the base of the bent portion of the yoke (1) and the magnet (2).

以上により、金属ブロック(7)はヨーク(1)の折曲
げ部の根元補強材となる。
As a result of the above, the metal block (7) serves as a base reinforcing material for the bent portion of the yoke (1).

以上のように、金属ブロック(7)をマグネット(2)
と連結して、ヨーク(1)の折曲げ部の根元に挿入、接
着するので、ヨーク(1)の折曲げ部を支点とした振動
を抑えることができる。またマグネット(2)の全長l
にわたって金属ブロック7が接着されるので、第10図
における反力F−+(N)およびF−2(N)からなる
一種のねじれの力を抑えることができる。更にレンズホ
ルダ(4)が回転してコイル(6)のASB点が任意の
地点に移動しても、この金属ブロック7は各々の地点で
の反力F−+  (N) 、F−2(N)に対して振動
を抑えることができる。
As described above, place the metal block (7) into the magnet (2).
Since it is inserted and bonded to the base of the bent portion of the yoke (1), vibrations using the bent portion of the yoke (1) as a fulcrum can be suppressed. Also, the total length of magnet (2) l
Since the metal block 7 is bonded over the entire length, it is possible to suppress a kind of twisting force consisting of reaction forces F-+(N) and F-2(N) in FIG. Furthermore, even if the lens holder (4) rotates and the ASB point of the coil (6) moves to an arbitrary point, this metal block 7 will be affected by the reaction forces F-+ (N) and F-2( Vibration can be suppressed compared to N).

第3図(a)、(b)は第10図の条件でのレンズホル
ダ(4)のゲイン、位相の周波数特性を示し、第9図に
比してゲイン、位相とも乱れが小さくなる。
FIGS. 3(a) and 3(b) show the frequency characteristics of the gain and phase of the lens holder (4) under the conditions of FIG. 10, and the disturbances in both the gain and phase are smaller than in FIG. 9.

なお、本発明は第1図に示す金属ブロック(7)の形状
に限定されるものではなく、第4図〜第7図の様なブロ
ックであってもよく、上記実施例と同様の効果を得るこ
とができる。
Note that the present invention is not limited to the shape of the metal block (7) shown in FIG. 1, but may be a block as shown in FIGS. Obtainable.

なお第4図は金属ブロック(7)の長さがマグネット(
2)の全長1より長い例を示し、第5図〜第7図は金属
ブロック(7)の断面形状の変形例を示す。
In addition, in Figure 4, the length of the metal block (7) is the length of the magnet (
2) is shown, and FIGS. 5 to 7 show modified examples of the cross-sectional shape of the metal block (7).

[発明の効果コ 以上のように、この発明によれば、金属ブロックをヨー
クの折曲げ部とマグネットの隙間に取付けられるように
構成したので、ヨークに生じる振動を抑え、レンズホル
ダの周波数特性をゲイン、位相において安定させるとい
う効果を得ることができる。
[Effects of the Invention] As described above, according to the present invention, the metal block is configured to be attached to the gap between the bent portion of the yoke and the magnet, thereby suppressing vibrations generated in the yoke and improving the frequency characteristics of the lens holder. It is possible to obtain the effect of stabilizing the gain and phase.

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

第1図はこの発明の一実施例による対物レンズ駆動装置
を示す断面側面図、第2図は第1図の正面図、第3図は
この発明の一実施例でのレンズホルダ周波数特性を示す
図、第4図〜第7図はこの発明の他の実施例を示す正面
図、断面側面図、第8図は従来の対物レンズ駆動装置を
示す断面図、第9図は従来装置のレンズホルダの周波数
特性を示す図、第10図は第1図や第9図の動作を説明
するための図である。 図中、(1)はヨーク、(2)はマグネット、(3)は
シャフト、(4)はレンズホルダ、(5)は対物ルンズ
、(6)はコイル、(7)は金属ブロック、(8)は接
着剤である。 なお、各図中同一符号は同一または相当部材を示す。
FIG. 1 is a cross-sectional side view showing an objective lens driving device according to an embodiment of the present invention, FIG. 2 is a front view of FIG. 1, and FIG. 3 is a diagram showing lens holder frequency characteristics in an embodiment of the present invention. 4 to 7 are front views and sectional side views showing other embodiments of the present invention, FIG. 8 is a sectional view showing a conventional objective lens drive device, and FIG. 9 is a lens holder of a conventional device. FIG. 10 is a diagram for explaining the operation of FIG. 1 and FIG. 9. In the figure, (1) is a yoke, (2) is a magnet, (3) is a shaft, (4) is a lens holder, (5) is an objective lens, (6) is a coil, (7) is a metal block, (8) is a ) is an adhesive. Note that the same reference numerals in each figure indicate the same or equivalent members.

Claims (1)

【特許請求の範囲】[Claims] 所定箇所をほぼ直角に折曲げた立設部を有するヨークと
、このヨークの立設部に取付けたマグネットからなる磁
気回路を備え、この磁気回路によりレンズホルダに取付
けた対物レンズをフォーカス方向又はトラッキング方向
に可動するための対物レンズ駆動装置において、前記マ
グネットを取付けるためのヨーク立設部のマグネット取
付け箇所と立設部の根元にあたる折曲げ部との隙間に、
非磁性の金属ブロックを取付けたことを特徴とする対物
レンズ駆動装置。
It is equipped with a magnetic circuit consisting of a yoke having an upright part bent at a predetermined point at a nearly right angle and a magnet attached to the upright part of the yoke, and this magnetic circuit moves the objective lens attached to the lens holder in the focusing direction or tracking. In an objective lens driving device for moving in a direction, a gap between a magnet attachment point of a yoke upright part for attaching the magnet and a bent part corresponding to the root of the upright part,
An objective lens drive device characterized by having a non-magnetic metal block attached.
JP3915590A 1990-02-20 1990-02-20 Objective lens driver Pending JPH03242831A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3915590A JPH03242831A (en) 1990-02-20 1990-02-20 Objective lens driver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3915590A JPH03242831A (en) 1990-02-20 1990-02-20 Objective lens driver

Publications (1)

Publication Number Publication Date
JPH03242831A true JPH03242831A (en) 1991-10-29

Family

ID=12545222

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3915590A Pending JPH03242831A (en) 1990-02-20 1990-02-20 Objective lens driver

Country Status (1)

Country Link
JP (1) JPH03242831A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0626016U (en) * 1992-08-24 1994-04-08 株式会社三協精機製作所 Objective lens drive
JPH0626017U (en) * 1992-08-24 1994-04-08 株式会社三協精機製作所 Objective lens drive

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0626016U (en) * 1992-08-24 1994-04-08 株式会社三協精機製作所 Objective lens drive
JPH0626017U (en) * 1992-08-24 1994-04-08 株式会社三協精機製作所 Objective lens drive

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