JPS5960739U

JPS5960739U - focus control device

Info

Publication number: JPS5960739U
Application number: JP15647882U
Authority: JP
Inventors: 昭橋本; 健治朗木目
Original assignee: 三菱電機株式会社
Priority date: 1982-10-14
Filing date: 1982-10-14
Publication date: 1984-04-20

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

[Brief explanation of drawings]

第１図および第２図は従来のフォーカス制御装置の構造
を示す断面図である。先に出願した内容の説明に使用し
た第３図はこの考案の一実施例のフォーカス制御装置の
可動部分を示す正面図、第４図は第３図の側面断面図、
第５図はこの考案の一実施例の断面図である。図において、１はヨーク、２はマグネット、３はギャッ
プ、４はコイル、５はコイルホルダ、６はコイルホルダ
５の側面部、７はレンズ、８は光スポット、１０および
１１は板ばね、１２は無潤滑軸受、１３は空間、１４は
コイルホルダ５の底面部、１５は空気孔を示す。なお、
図中、同一符号は同一、または相当部分を示す。第１図第２図1 and 2 are cross-sectional views showing the structure of a conventional focus control device. FIG. 3, which was used to explain the contents of the earlier application, is a front view showing the movable parts of a focus control device according to an embodiment of this invention, and FIG. 4 is a side sectional view of FIG. 3.
FIG. 5 is a sectional view of an embodiment of this invention. In the figure, 1 is a yoke, 2 is a magnet, 3 is a gap, 4 is a coil, 5 is a coil holder, 6 is a side surface of the coil holder 5, 7 is a lens, 8 is a light spot, 10 and 11 are leaf springs, 12 13 is a space, 14 is a bottom surface of the coil holder 5, and 15 is an air hole. In addition,
In the figures, the same reference numerals indicate the same or corresponding parts. Figure 1 Figure 2

Claims

[Scope of utility model registration request]

(1) An optical information recording and reproducing device that has at least one of the functions of optically reading information recorded on tracks on a recording medium or optically recording information on a recording medium. A magnetic circuit is formed by applying a magnet to a yoke arranged with a gap formed therein, a coil holder is provided for disposing and holding a coil within the gap, and a lens is fixed to the coil holder, The lens focuses incident light as a light spot on a recording medium, and the lens, the coil holder, and the magnet constitute a fixed part, and the lens is movable in the optical axis direction. The movable part support member supports the movable part so as to maintain a relative positional relationship between the light spot and the track section on the recording medium, and the movable part support member supports the movable part so as to maintain the relative positional relationship between the light spot and the track section on the recording medium, and between the movable part and the fixed part in order to adjust the position relative to the fixed part, thereby causing tracking movement of the lens in the direction of the optical axis in response to vibrations of the recording medium, and to allow movement of the lens in the direction of the optical axis. space,
The focus control device is characterized in that an air hole is formed in the side surface of the coil holder, which is the surface on which the coil is mounted, for venting the air enclosed in the space described above to the outside. .

(2) The focus control device according to claim 1, wherein the movable part supporting member is a leaf spring.

(3) The focus control device according to claim 2, wherein the leaf spring is provided with a slit.

(4) The focus control device according to claim 1, wherein the movable part support member is a non-lubricated bearing held by the fixed part and disposed in contact with the outer peripheral surface of the lens.

(5) The focus control device according to claim 4, wherein the outer peripheral surface of the lens has an alumite-treated surface.