JPS61101814U

JPS61101814U -

Info

Publication number: JPS61101814U
Application number: JP18765684U
Authority: JP
Priority date: 1984-12-11
Filing date: 1984-12-11
Publication date: 1986-06-28

Description

[Brief explanation of the drawing]

第１図〜第３図は本考案の実施例を示すもので
あり、第１図は光学式ピツクアツプの平面図、第
２図はその断面図、第３図は光学式ピツクアツプ
の分解斜視図、第４図は従来の光学式ピツクアツ
プの構造の概略を示す正面図、第５図は第４図の
右側面図である。２１……ヨーク、２１ａ，２１ｂ……板部、２
２……マグネツト、２３……フオーカスばね、２
４……中間部材、２５……トラツキングばね、２
６……レンズ保持部材、２７……対物レンズ、２
８……フオーカスコイル、２９……トラツキング
コイル、Ｔ_１……板部の先端の板厚、Ｔ_２……板
部の基端の板厚。 1 to 3 show an embodiment of the present invention, in which FIG. 1 is a plan view of an optical pickup, FIG. 2 is a sectional view thereof, and FIG. 3 is an exploded perspective view of the optical pickup. FIG. 4 is a front view schematically showing the structure of a conventional optical pickup, and FIG. 5 is a right side view of FIG. 4. 21...Yoke, 21a, 21b...Plate part, 2
2...Magnet, 23...Focus spring, 2
4... Intermediate member, 25... Tracking spring, 2
6... Lens holding member, 27... Objective lens, 2
8...Focusing coil, 29...Tracking coil, _T1 ...Thickness at the tip of the plate, _T2 ...Thickness at the base end of the plate.

Claims

[Scope of utility model registration request]

A lens holding member that holds an objective lens facing the recording medium is supported by a spring so as to be able to move slightly in the focus servo direction, which moves toward and away from the recording medium, and in the tracking servo direction, which moves along the recording surface of the recording medium. A focus coil that drives the lens holding member in the focus servo direction and a tracking coil that drives the lens holding member in the tracking servo direction are fixed to the lens holding member, and the focus coil In an optical pickup, the magnetic circuit is provided with a magnetic circuit that forms a magnetic field that crosses a tracking coil. The magnet and the plate supporting the magnet are inserted into the cylindrically wound focus coil, and the magnet is inserted between the focus coil and the tracking coil. A correction drive device for an optical pickup, characterized in that the other plate portion facing the is formed so that the thickness of the base portion is larger than the thickness of the tip portion.