JPS62158625U

JPS62158625U -

Info

Publication number: JPS62158625U
Application number: JP4564186U
Authority: JP
Priority date: 1986-03-27
Filing date: 1986-03-27
Publication date: 1987-10-08

Description

[Brief explanation of the drawing]

第１図は本案に係る光学ヘツドを示す平面図、
第２図はその要部の１／２波長板の支持構造を示
す斜視図、第３図は第２図の分解斜視図、第４図
は１／２波長板の調整について示す斜視図、第５
図は本案に係る光学ヘツドの他の例について示す
平面図、第６図は従来の光学ヘツドの１／２波長
板の支持構造を示す斜視図である。３０……１／２波長板支持部、３１……支持板
、３２……ホルダー、３２２……調整軸、３３…
…取付金具、１……オプトベース、２……レーザ
ダイオード、４……対物レンズ、９……１／２波
長板、１４，１５……光検出器、４０……調整治
具、１００……調整穴。 FIG. 1 is a plan view showing an optical head according to the present invention;
Fig. 2 is a perspective view showing the supporting structure of the 1/2 wavelength plate, which is the main part, Fig. 3 is an exploded perspective view of Fig. 2, and Fig. 4 is a perspective view showing adjustment of the 1/2 wavelength plate. 5
This figure is a plan view showing another example of the optical head according to the present invention, and FIG. 6 is a perspective view showing a support structure for a 1/2 wavelength plate of a conventional optical head. 30... 1/2 wavelength plate support part, 31... Support plate, 32... Holder, 322... Adjustment shaft, 33...
...Mounting bracket, 1...Opto base, 2...Laser diode, 4...Objective lens, 9...1/2 wavelength plate, 14, 15...Photodetector, 40...Adjustment jig, 100... adjustment hole.

補正昭６１．６．２０図面の簡単な説明を次のように補正する。明細書第１５頁第１７行の「第６図は」を「第
６図は従来の光学ヘツドを示す平面図、第７図は
」と訂正します。Amendment June 20, 1986 The brief description of the drawing is amended as follows. ``Figure 6'' on page 15, line 17 of the specification has been corrected to ``Figure 6 is a plan view showing a conventional optical head, and Figure 7 is''.

Claims

[Scope of utility model registration request]

A 1/2 wavelength plate and a polarizing beam splitter are installed in the light detection optical system of an optical head used in a magneto-optical disk player that magneto-optically records, reproduces, and erases information on a magneto-optical disk medium. In an optical head that detects the Kerr rotation angle using differential outputs of a pair of photodetectors, a support plate is provided near a return light input device perpendicular to the optical axis of the photodetection optical system, and a support plate is provided with a light beam on the support plate. A thin cylindrical holder is held rotatably around an axis, a 1/2 wavelength plate is attached to this holder, and the mounting angle of the 1/2 wavelength plate can be finely adjusted from outside the optical head body via the holder. An optical head characterized by: