JPS6040032U

JPS6040032U - optical head

Info

Publication number: JPS6040032U
Application number: JP13155683U
Authority: JP
Inventors: 和男野田
Original assignee: フォスタ−電機株式会社
Priority date: 1983-08-24
Filing date: 1983-08-24
Publication date: 1985-03-20

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図は従来の光学ヘッドの一例を示す構成図、第２図
はフォーカシング制御信号及びトラッキング制御信号の
取り出し方を示す説明図、第３図は本考案の一実施例の
光学系を示す構成図、第４図は第３図の主要部の具体例
を示す平面図、第５図は第４図のＡＡ断面図、第６図は
第４図のＢＢ断面の主要部を示す断面図、第７図は第４
図中のホルダーを示す斜視図である。１・・・半導体レーザ、２・４・ハーフプリズム、３・
・・コリメータレンズ、４・・・対物レンズ、５・・・
ディスク、６・・・シリンドリカルレンズ、７・・・フ
ォトダイ“オード、１０・・・ホルダー、１１・・・ガ
イド部材、１２・・・ミラー、１３・・・連結部材、１
５・・・フォーカシング用コイル、１６．２１〜２４・
・・マグネット、１７．１８・・・ヨーク、１９．２０
・・・トラッキング用コイル、２５．２６・・・ガイド
シャフト。FIG. 1 is a configuration diagram showing an example of a conventional optical head, FIG. 2 is an explanatory diagram showing how to extract a focusing control signal and a tracking control signal, and FIG. 3 is a configuration diagram showing an optical system according to an embodiment of the present invention. Figure 4 is a plan view showing a specific example of the main part in Fig. 3, Fig. 5 is a sectional view taken along line AA in Fig. 4, and Fig. 6 is a sectional view showing the main part in section BB in Fig. 4. Figure 7 is the 4th
It is a perspective view which shows the holder in a figure. 1...Semiconductor laser, 2.4.Half prism, 3.
...Collimator lens, 4...Objective lens, 5...
Disc, 6... Cylindrical lens, 7... Photo diode, 10... Holder, 11... Guide member, 12... Mirror, 13... Connection member, 1
5...Focusing coil, 16.21-24.
...Magnet, 17.18...Yoke, 19.20
...Tracking coil, 25.26...Guide shaft.

Claims

[Scope of utility model registration request]

A guide member having a guide hole in the focusing direction, a holder that is slidably disposed within the guide hole of the guide member while holding an objective lens, and is integrated with the guide member during tracking to perform tracking. a mirror that moves in the direction and changes the optical path between an optical path in the tracking direction and an optical path in the focusing direction; a support means that supports the guide member so as to be slidable in the tracking direction; and a focusing drive means that drives the holder. and a tracking drive means for driving the guide member.