JPS6358317U

JPS6358317U -

Info

Publication number: JPS6358317U
Application number: JP15077086U
Authority: JP
Priority date: 1986-09-30
Filing date: 1986-09-30
Publication date: 1988-04-19

Description

[Brief explanation of the drawing]

第１図はこの考案の一実施例を示す透視平面図
、第２図はその切断面―を示す断面図、第３
図は従来の対物レンズ駆動装置を示す透視平面図
、第４図はその切断面―を示す断面図、第５
図はレンズ保持部材に巻回する円筒コイルとこの
円筒コイルに装着する方形板状コイルの状態を示
す側面図である。図において、１はフレーム、２は支持軸、４は
対物レンズ、５は円筒コイル、８は内側ヨーク、
９は永久磁石、１３はレンズ保持部材、１３ａは
円筒巻枠部、１６は方形板状コイル、１７は外側
ヨークである。なお、各図中同一符号は同一、ま
たは相当部分を示す。 Fig. 1 is a perspective plan view showing one embodiment of this invention, Fig. 2 is a sectional view showing its cut surface, and Fig. 3 is a perspective view showing an embodiment of the invention.
The figure is a perspective plan view showing a conventional objective lens drive device, Fig. 4 is a cross-sectional view showing its cut surface, and Fig. 5
The figure is a side view showing the state of a cylindrical coil wound around a lens holding member and a rectangular plate-shaped coil attached to this cylindrical coil. In the figure, 1 is a frame, 2 is a support shaft, 4 is an objective lens, 5 is a cylindrical coil, 8 is an inner yoke,
9 is a permanent magnet, 13 is a lens holding member, 13a is a cylindrical winding frame, 16 is a rectangular plate-shaped coil, and 17 is an outer yoke. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims

[Claims for Utility Model Registration] (1) A non-magnetic lens holding member, which is equipped with an objective lens having an optical axis in the direction of this axis, is attached to a support shaft fixed to the frame, and is capable of sliding freely in the axial direction of the support shaft. A cylindrical coil is wound around a cylindrical winding frame concentric with the support shaft of the lens holding member, and a predetermined angle is formed around the axis of the support shaft outside the cylindrical coil. an outer yoke that faces the curved surface of the frame with a predetermined gap therebetween; and an inner yoke that faces the outer yoke with a predetermined gap between the inner surface of the cylindrical winding frame portion and the inner yoke that is disposed on the frame, and the outer yoke and A permanent magnet is inserted and fixed between at least one of the inner yokes and the frame, and the permanent magnet is inserted into a hole provided in the cylindrical winding frame,
A rectangular plate coil is provided inside the cylindrical coil, and one of the winding portions of the rectangular plate coil in the axial direction engages with a magnetic field generated between the outer yoke and the inner yoke. An objective lens drive device featuring: (2) The objective lens drive device according to claim 1, wherein the lens holding member is made of synthetic resin and has a cylindrical shape with one end surface. (3) The object according to claim 1 or 2 of the utility model registration claim, characterized in that the outer yoke and the inner yoke each consist of two identical pieces and are arranged symmetrically with respect to the support axis. Lens drive device. (4) The objective lens driving device according to claim 3, characterized in that four rectangular plate-shaped coils are provided.