JPS6381318U - - Google Patents

Description

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

第１図はこの考案の一実施例を示す対物レンズ
駆動装置のカバーを透視した平面図、第２図は第
１図のカバーを付けた平面図、第３図は第１図の
線−に沿つた断面図、第４図は第１図の線
−に沿つた断面図である。第５図は従来の対物
レンズ駆動装置のカバーを透視して示す平面図、
第６図は、第５図の線−に沿つた断面図、第
７図は、第５図の線−に沿つた断面図である
。 図において、１は本体フレーム、２はカバー、
３は支持軸、４は対物レンズ、５は対物レンズ保
持部材、６は焦点方向制御用コイル、７はトラツ
キング方向制御用コイル、８，９，１１はヨーク
、１０，１２は永久磁石、１３は光学部品、１４
はおもり、１５は間隙充填材、１６はカバーの切
欠き、５１は遮蔽機能のある対物レンズ保持部材
である。 Figure 1 is a plan view seen through the cover of an objective lens drive device showing an embodiment of this invention, Figure 2 is a plan view with the cover shown in Figure 1 attached, and Figure 3 is along the line - in Figure 1. FIG. 4 is a cross-sectional view taken along the line - of FIG. FIG. 5 is a plan view showing the cover of a conventional objective lens drive device as seen through;
6 is a sectional view taken along line - in FIG. 5, and FIG. 7 is a sectional view taken along line - in FIG. In the figure, 1 is the main body frame, 2 is the cover,
3 is a support shaft, 4 is an objective lens, 5 is an objective lens holding member, 6 is a focal direction control coil, 7 is a tracking direction control coil, 8, 9, and 11 are yokes, 10 and 12 are permanent magnets, and 13 is a optical parts, 14
15 is a weight, 15 is a gap filler, 16 is a cover notch, and 51 is an objective lens holding member having a shielding function.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 固定支持軸を持つ本体フレーム、上記固定支持
軸の軸線方向に摺動自在でかつ上記固定支持軸の
まわりを回転自在に上記固定支持軸に装着される
と共に遮蔽機能を持つた円筒形の対物レンズ保持
部材、上記対物レンズ保持部材内に収納された対
物レンズ焦点方向制御用コイルならびにトラツキ
ング方向制御用コイル、これらコイルと共に磁気
回路を形成する二つの永久磁石、および上記本体
フレームに固定された円筒形のカバーを備え、少
くとも上記永久磁石の一方と間隙充填材を同一半
径上に並べ且つこの両者を上記対物レンズ保持部
材と同心円筒状をなす位置において上記カバーに
固定した構造とすることを特徴とした光学式デイ
スク装置の対物レンズ駆動装置。 A main body frame having a fixed support shaft, a cylindrical objective lens that is slidable in the axial direction of the fixed support shaft, is attached to the fixed support shaft so as to be rotatable around the fixed support shaft, and has a shielding function. a holding member, an objective lens focal direction control coil and a tracking direction control coil housed in the objective lens holding member, two permanent magnets forming a magnetic circuit together with these coils, and a cylindrical shape fixed to the main body frame. At least one of the permanent magnets and the gap filler are arranged on the same radius, and both are fixed to the cover at a position concentrically cylindrical with the objective lens holding member. Objective lens drive device for optical disk devices.