JPS6239219U

JPS6239219U -

Info

Publication number: JPS6239219U
Application number: JP13068085U
Authority: JP
Priority date: 1985-08-26
Filing date: 1985-08-26
Publication date: 1987-03-09

Description

[Brief explanation of the drawing]

第１図は本考案による光ピツクアツプの光学装
置の実施例を示す部材配置図、第２Ａ図と第２Ｂ
図はフオーカスエラーの検知動作を概念的に示す
説明図、第３図は従来の光ピツクアツプの光学装
置の構成図である。２１……発光素子、２２……プリズム、２２ａ
……半反射面、２２ｂ……全反射面、２３……対
物レンズ、２４……受光素子、Ｄ……光デイスク
。 FIG. 1 is a component arrangement diagram showing an embodiment of an optical device for an optical pickup according to the present invention, and FIGS. 2A and 2B are
The figure is an explanatory diagram conceptually showing the focus error detection operation, and FIG. 3 is a block diagram of a conventional optical pickup optical device. 21... Light emitting element, 22... Prism, 22a
...Semi-reflective surface, 22b... Total reflection surface, 23... Objective lens, 24... Light receiving element, D... Optical disk.

Claims

[Scope of utility model registration request]

In an optical pickup equipped with a light-emitting element that generates a detection beam, an objective lens that focuses the detection beam on the recording surface of an optical disk, and a light-receiving element that detects the reflected beam from the optical disk, the objective lens is A prism is provided on the optical axis, and this prism includes a semi-reflective surface that is inclined at 45 degrees to the optical axis, and a semi-reflective surface that is perpendicular to the semi-reflective surface and that reflects the luminous flux of the reflected beam from the optical disk. An optical disc characterized in that halves of the prism have opposite total reflection surfaces, the light emitting element faces the semi-reflection surface of the prism, and the light receiving element faces the total reflection surface. optical device.