JPH0652560A - Driving device for objective lens - Google Patents

Abstract

PURPOSE:To shorten the distance from an objective lens to a fixed section in a spring-supported type objective lens driving device so as to house the device in the window frame of an optical disk cartridge. CONSTITUTION:An objective lens 1 is held at the central part of a three- dimensional mobile body 2 along the direction of tacks and the mobile body 2 is supported at four points by means of four plate springs 3a-3d for focusing which are arranged in parallel with each other. The end sections of the springs 3a-3d on the opposite side to the mobile body 2 are connected to a fixed supporting section 6 by using one plate spring 5 for tracking. The spring 5 is arranged in parallel with the direction of tracks at the central part of a repeating plate 4 and both ends of the spring 5 are connected to the section 6.

Description

Translated fromJapanese

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は光ディスク装置に用いる
対物レンズ駆動装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an objective lens driving device used in an optical disk device.

【０００２】[0002]

【従来の技術】図２を参照して、従来の対物レンズ駆動
装置の構成について説明する。2. Description of the Related Art The structure of a conventional objective lens driving device will be described with reference to FIG.

【０００３】図２において、１は光ディスク装置に用い
られる光学ヘッドの対物レンズであり、この対物レンズ
１は可動体２に固定保持されている。この可動体２は４
枚のフォーカシング用板ばね３ａ〜３ｄ，中継板４およ
びトラッキング用板ばね５を介して固定部６にフォーカ
ス方向（図２（ｂ）で言えば上下方向）およびトラック
方向（図２（ａ）で言えば上下方向）に移動自在に支持
されている。In FIG. 2, reference numeral 1 denotes an objective lens of an optical head used in an optical disk device, and the objective lens 1 is fixedly held by a movable body 2. This movable body 2 is 4
The focusing direction (vertical direction in FIG. 2B) and the track direction (FIG. 2A) are applied to the fixed portion 6 via the focusing leaf springs 3a to 3d, the relay plate 4, and the tracking leaf spring 5. It is supported so that it can move vertically.

【０００４】即ち、４枚のフォーカシング用板ばね３ａ
〜３ｄは、それらの一端が可動体２のフォーカス方向両
側部それぞれのトラック方向両端側に、幅方向をフォー
カス方向に直交して固定され、他端が互いに平行に中継
板４のフォーカス方向両側部に固定される。さらに、１
枚のトラッキング用板ばね５はフォーカシング用板ばね
３ａ〜３ｄの板面に直交するように、その幅方向の一側
が中継板４に固定され、他側が固定部６に固定されてい
る。That is, four focusing leaf springs 3a
3d, one end thereof is fixed to both ends of the movable body 2 in the focus direction on both sides in the track direction, the width direction thereof is orthogonal to the focus direction, and the other ends of the relay plate 4 are parallel to each other in the focus direction. Fixed to. Furthermore, 1
One side of the leaf spring 5 for tracking is fixed to the relay plate 4 and the other side is fixed to the fixing portion 6 so as to be orthogonal to the leaf surfaces of the leaf springs 3a to 3d for focusing.

【０００５】[0005]

【発明が解決しようとする課題】この従来の対物レンズ
駆動装置では、可動体，対物レンズ，中継板等を１枚の
トラッキング用板ばねを介して可動体とは反対方向に配
置した固定支持部に連結していた。そのため、対物レン
ズから固定支持部までの距離が長くなり、光ディスク媒
体のカートリッジの窓枠に入らないという問題点があっ
た。In this conventional objective lens driving device, a fixed support portion in which a movable body, an objective lens, a relay plate and the like are arranged in a direction opposite to the movable body via one tracking leaf spring. Was linked to. Therefore, there is a problem in that the distance from the objective lens to the fixed support portion becomes long and it cannot enter the window frame of the cartridge of the optical disc medium.

【０００６】[0006]

【課題を解決するための手段】本発明の対物レンズ駆動
装置は、対物レンズをトラック方向に沿って中央部に保
持する可動体と、この可動体をそれぞれの端部で４点支
持する互いに平行な４枚のフォーカシング用板ばねと、
これら４枚のフォーカシング用板ばねの前記可動体とは
反対側に位置する端部を中継板を介して固定支持部に連
結する１枚のトラッキング用板ばねとを備えた対物レン
ズ駆動装置において、前記中継板を保持する前記１枚の
トラッキング用板ばねを前記トラック方向と平行に、か
つ、前記中継板の中央部に配置し、前記１枚のトラッキ
ング用板ばねの両端をそれぞれ固定支持部に連結して構
成される。SUMMARY OF THE INVENTION An objective lens driving device according to the present invention comprises a movable body which holds the objective lens at a central portion along the track direction, and a movable body which supports the movable body at four points at respective end portions and is parallel to each other. 4 leaf springs for focusing,
In an objective lens driving device including one tracking leaf spring, which connects the ends of these four focusing leaf springs located on the opposite side to the movable body to a fixed support through a relay plate, The one tracking leaf spring holding the relay plate is arranged in parallel to the track direction and in the center of the relay plate, and both ends of the one tracking leaf spring are fixed support portions. It is composed by connecting.

【０００７】[0007]

【実施例】次に本発明について図面を参照して説明す
る。The present invention will be described below with reference to the drawings.

【０００８】図１（ａ），（ｂ）および（ｃ）は本発明
の一実施例の平面図，正面図および側面図である。FIGS. 1A, 1B and 1C are a plan view, a front view and a side view of an embodiment of the present invention.

【０００９】図１に示す実施例における対物レンズ１，
可動体２，フォーカシング用板ばね３ａ〜３ｄ，中継板
４の配置は図２の従来例におけると同じである。図２の
従来例との相違はトラッキング板ばね５の配置とその支
持方法である。以下にこれら相違点を詳細に説明する。Objective lens 1 in the embodiment shown in FIG.
The arrangement of the movable body 2, the focusing leaf springs 3a to 3d, and the relay plate 4 is the same as in the conventional example of FIG. The difference from the conventional example of FIG. 2 is the arrangement of the tracking leaf spring 5 and the method of supporting the same. These differences will be described in detail below.

【００１０】図１（ａ）を参照して、トラッキング用板
ばね５をトラック方向に平行に配置する。図１（ｃ）を
参照して説明すると、トラッキング用板ばね５の中央部
を中継板４との連結部に使用し、トラッキング用板ばね
５の両端をそれぞれ固定部６で支持する。従って、図１
（ｂ）に示す様に、固定部６がトラッキング用板ばね５
に対して可動体２と同方向に配置されるので、トラック
方向と垂直方向の長さは可動体２から中継板４までの距
離となり、小型化が計れる。Referring to FIG. 1A, the tracking leaf springs 5 are arranged parallel to the track direction. Explaining with reference to FIG. 1C, the center portion of the tracking leaf spring 5 is used as a connecting portion with the relay plate 4, and both ends of the tracking leaf spring 5 are supported by the fixing portions 6. Therefore, FIG.
As shown in (b), the fixed portion 6 is the leaf spring 5 for tracking.
Since it is arranged in the same direction as the movable body 2, the length in the direction perpendicular to the track direction is the distance from the movable body 2 to the relay plate 4, and the size can be reduced.

【００１１】[0011]

【発明の効果】以上説明したように本発明は、トラッキ
ング用板ばねの配置を従来とは直交する方向に変更し、
かつ、固定部をトラッキング用板ばねに対して可動体と
同方向に配置したことで、対物レンズから固定部までの
距離を短くしたので、トラック方向と垂直方向の小型化
が計れ、光ディスク媒体のカートリッジの窓枠に入れる
ことができるという効果を有する。As described above, according to the present invention, the arrangement of the tracking leaf springs is changed to the direction orthogonal to the conventional one.
Moreover, since the fixed portion is arranged in the same direction as the movable body with respect to the leaf spring for tracking, the distance from the objective lens to the fixed portion is shortened, so that the track direction and the vertical direction can be downsized, and the optical disc medium It has an effect that it can be put in the window frame of the cartridge.

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

【図１】分図（ａ），（ｂ）および（ｃ）は本発明の一
実施例の平面図，正面図および側面図である。1A, 1B and 1C are a plan view, a front view and a side view of an embodiment of the present invention.

【図２】分図（ａ）および（ｂ）は従来の対物レンズ駆
動装置の平面図および正面図である。2A and 2B are a plan view and a front view of a conventional objective lens driving device.

【符号の説明】[Explanation of symbols]

１ 対物レンズ ２ 可動体 ３ａ〜３ｄ フォーカシング用板ばね ４ 中継板 ５ トラッキング用板ばね ６ 固定部 DESCRIPTION OF SYMBOLS 1 Objective lens 2 Movable body 3a-3d Leaf spring for focusing 4 Relay plate 5 Leaf spring for tracking 6 Fixed part

Claims (1)

Translated fromJapanese

【特許請求の範囲】[Claims]【請求項１】 対物レンズをトラック方向に沿って中央
部に保持する可動体と、この可動体をそれぞれの端部で
４点支持する互いに平行な４枚のフォーカシング用板ば
ねと、これら４枚のフォーカシング用板ばねの前記可動
体とは反対側に位置する端部を中継板を介して固定支持
部に連結する１枚のトラッキング用板ばねとを備えた対
物レンズ駆動装置において、前記中継板を保持する前記
１枚のトラッキング用板ばねを前記トラック方向と平行
に、かつ、前記中継板の中央部に配置し、前記１枚のト
ラッキング用板ばねの両端をそれぞれ固定支持部に連結
したことを特徴とする対物レンズ駆動装置。1. A movable body for holding an objective lens at a central portion along a track direction, four parallel leaf springs for focusing which support the movable body at four points at respective ends, and these four leaf springs. In the objective lens driving device, a focusing plate spring is connected to a fixed supporting portion through an intermediate plate at an end of the focusing plate spring opposite to the movable body. The one tracking leaf spring holding the above is arranged in parallel with the track direction and in the center of the relay plate, and both ends of the one tracking leaf spring are connected to fixed supporting portions, respectively. An objective lens driving device characterized by: