JPS6257923U

JPS6257923U -

Info

Publication number: JPS6257923U
Application number: JP14910685U
Authority: JP
Priority date: 1985-09-30
Filing date: 1985-09-30
Publication date: 1987-04-10

Description

[Brief explanation of the drawing]

第１図及び第２図ａ，ｂはこの考案の一実施例
に係る光ピツクアツプを示す斜視図、一部切欠平
面図及び一部切欠側面図、第３図ａ，ｂはこの考
案の変形例を示す平面図と側面図、第４図は一般
的な光ピツクアツプの基本的光学系を示す構成図
、第５図は光ピツクアツプにおける非点収差法用
の光学系を示す斜視図、第６図ａ，ｂ，ｃは光ピ
ツクアツプにおける光検出器上のビームスポツト
の形状変化を示す平面図、第７図は焦点のデイス
ク面からのズレに対する電気信号の変化を示す特
性曲線図、第８図ａ，ｂ，ｃは３ビーム法におけ
るトラツク上の３つのビームスポツトの変化を示
す平面図、第９図ａ，ｂは従来の光ピツクアツプ
における回折格子及び回折格子ホルダーを示す平
面図と断面図、第１０図は第９図の回折格子及び
回折格子ホルダーを光ピツクアツプに装着した状
態を示す断面図である。１……光ピツクアツプ本体、２……軸受部、３
……連結部、４……連結軸、５……光ピツクアツ
プ移動面、６，７……調整ネジ、８……回折格子
、９……送り軸、１０……コイルバネ、１１……
対物レンズ、１２……光源、１３……光検出器、
１４……コリメータレンズ、１５……ビームスプ
リツタ、１６……光デイスク。 1 and 2 a and b are a perspective view, a partially cutaway plan view, and a partially cutaway side view showing an optical pickup according to an embodiment of this invention, and FIGS. 3a and 3b are a modification of this invention. Fig. 4 is a configuration diagram showing the basic optical system of a general optical pickup, Fig. 5 is a perspective view showing an optical system for the astigmatism method in an optical pickup, Fig. 6 a, b, and c are plan views showing changes in the shape of the beam spot on the photodetector in the optical pickup; FIG. 7 is a characteristic curve diagram showing changes in the electrical signal with respect to the deviation of the focal point from the disk surface; FIG. 8 a , b, and c are plan views showing changes in the three beam spots on the track in the three-beam method. FIG. 10 is a sectional view showing the diffraction grating and diffraction grating holder shown in FIG. 9 attached to an optical pickup. 1... Optical pickup main body, 2... Bearing section, 3
... Connecting portion, 4... Connection shaft, 5... Optical pickup moving surface, 6, 7... Adjustment screw, 8... Diffraction grating, 9... Feed shaft, 10... Coil spring, 11...
Objective lens, 12... light source, 13... photodetector,
14... Collimator lens, 15... Beam splitter, 16... Optical disk.

Claims

[Claims for utility model registration] (1) At least a light source, an objective lens, a photodetector,
It is divided into an optical pickup main body having a diffraction grating, etc., and a bearing supported on a feed shaft that moves the optical disk in the radial direction, and the optical pickup main body is rotatably connected to the bearing within the moving plane of the optical pickup. An optical pickup characterized in that it is configured such that the angles of the three beams with respect to the track can be adjusted. (2) The above-mentioned optical pickup main body and the above-mentioned bearing part are connected by a connecting shaft in the normal direction of the above-mentioned moving surface, and the angle of the three beams is adjusted by an adjustment screw provided in the above-mentioned bearing part. Optical pickup as described in Range 1. (3) The optical pickup main body and the bearing section are connected by at least two adjustment screws provided on the bearing section, and a coil spring is attached to the outer periphery of the adjustment screw between the optical pickup and the bearing section. An optical pickup according to claim 1 of the claimed utility model registration.