JPH046818U

JPH046818U -

Info

Publication number: JPH046818U
Application number: JP4573990U
Authority: JP
Priority date: 1990-04-28
Filing date: 1990-04-28
Publication date: 1992-01-22

Description

[Brief explanation of the drawing]

第１図はこの考案の一実施例による光学式デイ
スク装置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２図は第１図の−線の断面
図、第３図は従来のものを示す平面図、第４図お
よび第５図は第３図のそれぞれ−線および
−線の断面図である。図において、１……本体フレーム、２……支持
軸、２３……対物レンズ、２３ａ……つば部、２
３ｂ……第１の円筒部、２３ｃ……第２の円筒部
、２４……対物レンズ保持部材、２４ｂ……第１
の円筒溝部、２４ｃ……取付面、２４ｄ……第２
の円筒溝部である。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 plan view showing a cover of an objective lens driving device of an optical disk device according to an embodiment of the invention, FIG. 2 is a sectional view taken along the line -- in FIG. 1, and FIG. The plan view, FIGS. 4 and 5, are sectional views taken along the - line and - line, respectively, in FIG. 3. In the figure, 1...Body frame, 2...Support shaft, 23...Objective lens, 23a...Brim portion, 2
3b...first cylindrical part, 23c...second cylindrical part, 24...objective lens holding member, 24b...first
Cylindrical groove part, 24c...Mounting surface, 24d...Second
This is a cylindrical groove. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims

[Claims for Utility Model Registration] An objective lens having a substantially cylindrical outer shape and forming a light spot on the disk, a support shaft fixed to the main body frame, and an object lens capable of sliding in the axial direction of the support shaft, and comprising: An objective lens holding member that is rotatably provided around a support shaft and forms a substantially cylindrical groove whose central axis is parallel to the support shaft, and accommodates and holds the objective lens within the groove, The groove of the objective lens holding member is composed of a first cylindrical groove and a second cylindrical groove having a smaller diameter than the first cylindrical groove, and the outer shape of the objective lens is formed on the outer surface of the objective lens holding member. a first cylindrical portion that fits into the contactable flange portion and the first cylindrical groove portion with a predetermined fit accuracy and has a short axial length to an extent that does not restrict the inclination of the objective lens in the optical axis direction; A second cylindrical part has a smaller diameter than the first cylindrical part and faces the second cylindrical groove part through a predetermined gap, and the brim part is brought into contact with the objective lens holding member. regulating the position of the lens in the optical axis direction and the inclination of the optical axis, and regulating the position of the objective lens in a plane perpendicular to the optical axis by fitting the first cylindrical part into the first cylindrical groove;
An optical disk device characterized in that the objective lens is fixed to the objective lens holding member by inserting an adhesive into the gap.