JPH0481213U

JPH0481213U -

Info

Publication number: JPH0481213U
Application number: JP12620490U
Authority: JP
Priority date: 1990-11-28
Filing date: 1990-11-28
Publication date: 1992-07-15

Description

[Brief explanation of the drawing]

第１図は本考案の第１実施例の一部を破断した
斜視図、第２図はその部分分解斜視図、第３図は
その断面図、第４図は偏光の回転角度とＰ偏光お
よびＳ偏光の各成分の値との関係を示す模式図、
第５図は本考案の第１実施例の変形例の断面図、
第６図は本考案の第２実施例の斜視図、第７図は
その断面図、第８図は本考案が適用される光デイ
スク装置の模式的な斜視構成図である。１……レーザ光源、２……コリメータレンズ、
３……ビーム整形プリズム、４……主ビームスプ
リツタ、５……ミラー、６……対物レンズ、７…
…光デイスク、８……集光レンズ、９……ＡＰＣ
センサ、１０……1/2波長板、１１……副ビーム
スプリツタ、１２，１３……集光レンズ、１４，
１５……データセンサ、１６……集光レンズ、１
７……シリンドリカルレンズ、１８……サーボセ
ンサ、２１……ホルダ、２２……支持台、２３…
…凹部、２４……固定柱、２５……調整板、２６
……両側片、２７……ねじ、２８……一端片、２
９……他端片、３０……調整ねじ、３１……ホル
ダ、３２……支持台、３３……凹部、３４……支
持板、３５……基部、３６……ねじ、３７……支
持枠、３８……突片、３９……アーム、４０……
調整ねじ、４１……圧縮ばね。 Fig. 1 is a partially cutaway perspective view of the first embodiment of the present invention, Fig. 2 is a partially exploded perspective view thereof, Fig. 3 is a sectional view thereof, and Fig. 4 shows the rotation angle of polarized light, P polarization, and A schematic diagram showing the relationship between the values of each component of S-polarized light,
FIG. 5 is a sectional view of a modification of the first embodiment of the present invention;
FIG. 6 is a perspective view of a second embodiment of the present invention, FIG. 7 is a sectional view thereof, and FIG. 8 is a schematic perspective view of an optical disk device to which the present invention is applied. 1... Laser light source, 2... Collimator lens,
3...Beam shaping prism, 4...Main beam splitter, 5...Mirror, 6...Objective lens, 7...
...Optical disk, 8...Condensing lens, 9...APC
Sensor, 10... 1/2 wavelength plate, 11... Sub beam splitter, 12, 13... Condensing lens, 14,
15...Data sensor, 16...Condensing lens, 1
7... Cylindrical lens, 18... Servo sensor, 21... Holder, 22... Support stand, 23...
... recess, 24 ... fixed column, 25 ... adjustment plate, 26
...Both sides pieces, 27...Screws, 28...One end piece, 2
9... Other end piece, 30... Adjustment screw, 31... Holder, 32... Support stand, 33... Recess, 34... Support plate, 35... Base, 36... Screw, 37... Support frame , 38... protrusion, 39... arm, 40...
Adjustment screw, 41...compression spring.

Claims

[Scope of utility model registration request]

The polarization plane of the laser beam reflected from the optical disk
In an optical information reproducing device configured to rotate a 1/2 wavelength plate by a required angle, extract an S polarization component and a P polarization component from the rotated laser beam, and detect the respective information, the 1/2 wavelength plate An optical disk device characterized in that its rotational position around an optical axis is adjustable.