JPS5971432U

JPS5971432U - Optical head for optical disk

Info

Publication number: JPS5971432U
Application number: JP16590882U
Authority: JP
Inventors: 古田　賢治; 守石原; 渡辺　勢夫; 昌久篠田; 大門　正博
Original assignee: 三菱電機株式会社
Priority date: 1982-11-01
Filing date: 1982-11-01
Publication date: 1984-05-15

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

【図面の簡単な説明】第１図ａ、　　ｂはこの考案の一実施例を示すもので、
第１図ａは平面図、第１図すは第１図ａの複合プリズム
の下方部分の構成を示す側面図、第２図ａ、　　ｂは第
１図ａ、　　ｂに示した光学系を一体に組み込んだ光学
ヘッドの平面図および一部を破断した正面図、第３図ａ
、　　ｂは第２図ａ、　　ｂにおける要部の詳細を示す
正面図およびＡ−Ａ方向からみた一部を破断して示した
図、第４図ａ、　　ｂ、　　ｃは複合プリズムの詳細を
示す拡大図で、第４図ａは平面図、第４図すは正面図お
よび第４図Ｃは側面図、第５図ａ、　　ｂ、　　ｃはハ
ーフミラ−支持台の詳細を示す拡大図で、第５図ａは平
面図、第５図すは正面図および第５図Ｃは第５図ａのＢ
−Ｂ方向からみた図、第６図ａ、　　ｂ、　　ｃは支持
台の詳細を示す拡大図で、第６図ａは平面図、第６図す
は正面図および第６図Ｃは側面図である。図中、１は半導体レーザ、２はガラス板、３はコリメー
トレンズ、４は三角プリズム、５は複合プリズム、６は
波長板、７は集光レンズ、８はディスク、９はハーフミ
ラ−１１０は平凸レンズ、１１はシリンドリカルレンズ
、１２はオートトラッキング用フォトダイオード、１３
はオートフォーカス用フォトダイオード、１４は光源保
持体、１５は複合プリズム支持台、１５ａ、１５ｂはス
リット、１５ｄ、１５ｅはねじ、１６はハーフミラ−支
持台、１６ａは突起、１７は支持台、１７ａはキー、１
８は筐体、１９はコリメートレンズ保持筒、２０は凸球
面板、２１は凹球面板、２２は０リング、２３はねじ、
２４は台である。なお、図中の同一符号は同一または相
当部分を示す。第３図第５図[Brief explanation of the drawings] Figures 1a and 1b show an embodiment of this invention.
Figure 1a is a plan view, Figure 1a is a side view showing the configuration of the lower part of the composite prism in Figure 1a, and Figures 2a and b are the optical systems shown in Figures 1a and b integrated. A plan view and a partially cutaway front view of the optical head incorporated in the optical head, Fig. 3a
, b is a front view showing details of the main parts in Figs. 2a and b, and a partially cutaway view seen from the A-A direction, and Figs. 4a, b, and c show details of the composite prism. In the enlarged views, FIG. 4A is a plan view, FIG. 4A is a front view, FIG. 4C is a side view, and FIGS. Figure 5 a is a plan view, Figure 5 is a front view, and Figure 5 C is B of Figure 5 a.
Figures 6a, b, and c are enlarged views showing details of the support base, Figure 6a is a plan view, Figure 6 is a front view, and Figure 6C is a side view. be. In the figure, 1 is a semiconductor laser, 2 is a glass plate, 3 is a collimating lens, 4 is a triangular prism, 5 is a compound prism, 6 is a wavelength plate, 7 is a condenser lens, 8 is a disk, 9 is a half mirror, and 110 is a flat Convex lens, 11 is a cylindrical lens, 12 is an auto-tracking photodiode, 13
14 is an autofocus photodiode, 14 is a light source holder, 15 is a composite prism support base, 15a and 15b are slits, 15d and 15e are screws, 16 is a half mirror support base, 16a is a protrusion, 17 is a support base, and 17a is a key, 1
8 is a housing, 19 is a collimating lens holding cylinder, 20 is a convex spherical plate, 21 is a concave spherical plate, 22 is an O ring, 23 is a screw,
24 is a stand. Note that the same reference numerals in the figures indicate the same or corresponding parts. Figure 3 Figure 5

Claims

[Scope of utility model registration request]

(1) In an optical disk device that performs recording by condensing laser light from a semiconductor laser into a fine spot diameter and drilling holes in a medium on a rotating disk, the semiconductor laser is placed on a table in the horizontal and vertical directions. and a condensing lens that includes a prism and a light source holder whose angle in the front and rear directions can be adjusted and whose distance between the collimating lens and the collimator lens that is disposed oppositely is adjustable, and which irradiates the medium with the laser light that has exited the prism. a composite prism that guides the return light from the medium, a half mirror that makes the return light reflected from the medium enter an auto-tracking photodiode and an auto-focus photodiode, a plano-convex lens and a cylindrical lens for determining the focal position of the return light; An optical head for an optical disk, characterized in that the stand and the stand are respectively attached to a housing.

(2) A utility model registration request characterized in that the distance between the semiconductor laser and the collimating lens is adjusted by an elastic O-ring interposed between the two and a screw that tightens the two through the O-ring. An optical head for an optical disk as described in scope (1).

(3) Utility model registration claim No. 1, characterized in that the prism provided on the table is a triangular prism that changes the beam shape from an ellipse to a circle after being made into parallel light by a semiconductor laser and a collimating lens. An optical head for an optical disk as described in .

(4) A compound prism consists of a polarizing beam splitter that transmits light going to the medium and reflects light returning from the medium, and a polarizing beam splitter that bends the optical axis at right angles just before the condenser lens. An optical head for an optical disk according to claim (1) of the utility model registration, characterized in that the optical head is integrated with a reflecting prism.

(5) The composite prism is attached to the housing by a composite prism support, and this composite prism support can be used in two axial directions to finely adjust its installation position in a plane including the optical axis direction and a direction perpendicular to this. With a slit processed into
An optical head for an optical disk according to claim 1, wherein the distance between one end of the slit is adjusted by tightening a screw.

(6) A utility model characterized in that the half mirror is attached to the housing by a half mirror support, and the half mirror support is attached to the housing by a keyway mechanism to adjust the installation position. An optical head for an optical disk according to registered claim (1). ′
□

(7) The plano-convex lens and the cylindrical lens are provided on the same support base and attached to the housing, and the support base is attached to the housing by a keyway mechanism to adjust the installation position. An optical head for an optical disk according to claim (1) of the utility model registration.