JPS63149416U - - Google Patents

Description

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

第１図はこの考案による光ピツクアツプの一例
を示す断面図、第２図は第１図の拡大平面図、第
３図は第１図のＡＡ線断面図、第４図は固定基板
上の磁気ヨーク及び永久磁石の状態を示す斜視図
である。 Fig. 1 is a sectional view showing an example of an optical pickup according to this invention, Fig. 2 is an enlarged plan view of Fig. 1, Fig. 3 is a sectional view taken along the line AA in Fig. 1, and Fig. 4 is a magnetic field on a fixed substrate. It is a perspective view showing the state of a yoke and a permanent magnet.

補正 昭６２．４．２４ 実用新案登録請求の範囲を次のように補正する
。Amendment April 24, 1982 The scope of claims for utility model registration is amended as follows.

【実用新案登録請求の範囲】 可動基板を回動自在に、かつその回動軸心に沿
つて移動自在に磁性材の固定基板上に取付け、 その可動基板にその回動軸心から離されて読取
用対物レンズを取付け、 上記回動軸心を軸心とするフオーカシング用コ
イルを上記可動基板に取付け、 上記回動軸心に対し上記読取用対物レンズと反
対側において軸心が上記回動軸心に対しほゞ直角
方向のトラツキング用コイルを上記可動基板に取
付け、 上記可動基板の回動及び軸方向移動をそれぞれ
電磁駆動手段で行う光ピツクアツプにおいて、 上記回動軸心に対して互に反対に位置して上記
フオーカシング用コイルの一側とそれぞれ対向し
て上記固定基板と一体に形成された第１、第２磁
気ヨークと、 これら第１、第２磁気ヨークとそれぞれ対向し
、上記フオーカシング用コイルの他側において上
記固定基板に取付けられ、その固定基板の厚さ方
向に着磁された第１、第２永久磁石と、 これら第１、第２永久磁石上にそれぞれ取付け
られ上記第１、第２磁気ヨークと上記フオーカシ
ング用コイルを介して対向している第３、第４磁
気ヨークと、 上記トラツキング用コイルの一側と対向して上
記固定基板と一体に形成された第５磁気ヨークと
、 その第５磁気ヨークと対向し、上記トラツキン
グ用コイルの他側において上記固定基板に取付け
られ、その固定基板の厚さ方向に着磁された第３
永久磁石と、 その第３永久磁石上に取付けられ、上記トラツ
キング用コイルを介して上記第５磁気ヨークと対
向している第６磁気ヨークとを具備する光ピツク
アツプ。[Scope of Claim for Utility Model Registration] A movable substrate is rotatably mounted on a fixed substrate made of a magnetic material so as to be movable along its rotation axis, and a movable substrate is mounted on a fixed substrate made of a magnetic material at a distance from the rotation axis. A reading objective lens is attached, and a focusing coil having the rotational axis as its axis is attached to the movable substrate, and the axis is aligned with the rotational axis on the opposite side of the reading objective lens with respect to the rotational axis. In an optical pickup in which tracking coils are attached to the movable substrate in a direction substantially perpendicular to the center, and the movable substrate is rotated and moved in the axial direction by electromagnetic drive means, the tracking coils are arranged in directions substantially perpendicular to the center of the rotation axis. first and second magnetic yokes that are integrally formed with the fixed substrate, respectively facing one side of the focusing coil; and facing the first and second magnetic yokes, respectively and facing one side of the focusing coil. first and second permanent magnets attached to the fixed substrate on the other side of the coil and magnetized in the thickness direction of the fixed substrate; and first and second permanent magnets attached on the first and second permanent magnets, respectively. third and fourth magnetic yokes facing the second magnetic yoke via the focusing coil; and a fifth magnetic yoke facing one side of the tracking coil and integrally formed with the fixed substrate. , facing the fifth magnetic yoke, attached to the fixed substrate on the other side of the tracking coil, and magnetized in the thickness direction of the fixed substrate.
An optical pickup comprising a permanent magnet and a sixth magnetic yoke mounted on the third permanent magnet and facing the fifth magnetic yoke via the tracking coil.

Claims (1)

【実用新案登録請求の範囲】 可動基板を回動自在に、かつその回動軸心に沿
つて移動自在に磁性材の固定基板上に取付け、 その可動基板にその回動軸心から離されて読取
用対物レンズを取付け、 上記回動軸心を軸心とするフオーカシング用コ
イルを上記可動基板の上記固定基板側に取付け、 上記回動軸心に対し上記読取用対物レンズと反
対側において軸心が上記回動軸心に対しほゞ直角
方向のトラツキング用コイルを上記可動基板に取
付け、 上記可動基板の回動及び軸方向移動をそれぞれ
電磁駆動手段で行う光ピツクアツプにおいて、 上記回動軸心に対して互に反対に位置して上記
フオーカシング用コイルの一側とそれぞれ対向し
て上記固定基板と一体に形成された第１、第２磁
気ヨークと、 これら第１、第２磁気ヨークとそれぞれ対向し
、上記フオーカシング用コイルの他側において上
記固定基板に取付けられ、その固定基板の厚さ方
向に着磁された第１、第２永久磁石と、 これら第１、第２永久磁石上にそれぞれ取付け
られ上記第１、第２磁気ヨークと上記フオーカシ
ング用コイルを介して対向している第３、第４磁
気ヨークと、 上記トラツキング用コイルの一側と対向して上
記固定基板と一体に形成された第５磁気ヨークと
、 その第５磁気ヨークと対向し、上記トラツキン
グ用コイルの他側において上記固定基板に取付け
られ、その固定基板の厚さ方向に着磁された第３
永久磁石と、 その第３永久磁石上に取付けられ、上記トラツ
キング用コイルを介して上記第５磁気ヨークと対
向している第６磁気ヨークとを具備する光ピツク
アツプ。[Scope of Claim for Utility Model Registration] A movable substrate is rotatably mounted on a fixed substrate made of a magnetic material so as to be movable along its rotation axis, and a movable substrate is mounted on a fixed substrate made of a magnetic material at a distance from the rotation axis. A reading objective lens is attached, a focusing coil having the rotational axis as its axis is attached to the fixed substrate side of the movable substrate, and the focusing coil is centered on the side opposite to the reading objective lens with respect to the rotational axis. In an optical pickup, a tracking coil is attached to the movable substrate in a direction substantially perpendicular to the rotation axis, and the rotation and axial movement of the movable substrate are respectively performed by electromagnetic driving means. first and second magnetic yokes that are integrally formed with the fixed substrate and located opposite to each other and facing one side of the focusing coil; and facing the first and second magnetic yokes, respectively. and first and second permanent magnets attached to the fixed substrate on the other side of the focusing coil and magnetized in the thickness direction of the fixed substrate, and attached on the first and second permanent magnets, respectively. third and fourth magnetic yokes facing the first and second magnetic yokes via the focusing coil, and integrally formed with the fixed substrate and facing one side of the tracking coil. a fifth magnetic yoke; and a third magnetic yoke that faces the fifth magnetic yoke, is attached to the fixed substrate on the other side of the tracking coil, and is magnetized in the thickness direction of the fixed substrate.
An optical pickup comprising a permanent magnet and a sixth magnetic yoke mounted on the third permanent magnet and facing the fifth magnetic yoke via the tracking coil.