JPS5945734U - Focus drive mechanism of optical pickup - Google Patents

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

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

第１図は光学式ピックアップの基本的な構成図、第２図
は従来のフォーカス駆動機構の構成を示す断面図、第３
図はフォーカス駆動機構の特性（フォーカスエラー電流
に対する変位量）を示す図、第４図は本考案のフォーカ
ス駆動機構の構成を示す断面図である。 ５は対物レンズ、１５は支持体、１８は支持枠、１９は
リング状マグネット、２０ａ、２０ｔｌよコイルである
。Figure 1 is a basic configuration diagram of an optical pickup, Figure 2 is a sectional view showing the configuration of a conventional focus drive mechanism, and Figure 3 is a sectional view showing the configuration of a conventional focus drive mechanism.
FIG. 4 is a diagram showing the characteristics of the focus drive mechanism (displacement amount with respect to focus error current), and FIG. 4 is a sectional view showing the configuration of the focus drive mechanism of the present invention. 5 is an objective lens, 15 is a support body, 18 is a support frame, 19 is a ring-shaped magnet, and 20a and 20tl are coils.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 対物レンズ５を支持した支持体１５の下端部を延長し、
当該延長部に対向して上下方向に着磁したリング状マグ
ネット１９を配置し、上記延長部のマグネット１９の両
磁極面と垂直に対向する位置に同方向の駆動力を得る第
１、第２のコイル２０ａ、２０ｂをそれぞれ巻装し、上
記支持体１５を支持枠１８に上下動可能に支持した光学
式ピックアップのフォーカス駆動機構。Extending the lower end of the support 15 that supported the objective lens 5,
A ring-shaped magnet 19 magnetized in the vertical direction is arranged opposite to the extension part, and first and second magnets obtain a driving force in the same direction at positions perpendicularly facing both magnetic pole surfaces of the magnet 19 of the extension part. This is a focus drive mechanism for an optical pickup in which coils 20a and 20b are wound respectively, and the support body 15 is supported on a support frame 18 so as to be movable up and down.