JPS62202628U

JPS62202628U -

Info

Publication number: JPS62202628U
Application number: JP8788686U
Authority: JP
Priority date: 1986-06-11
Filing date: 1986-06-11
Publication date: 1987-12-24

Description

[Brief explanation of the drawing]

第１図は本考案の実施例に係るコンパクトデイ
スクプレーヤの情報読取装置を示す斜視図、第２
図は実施例に係るコリメートレンズの正面図、第
３図は他の実施例に係るコリメートレンズの正面
図、第４図は従来のコンパクトデイスクプレーヤ
の情報読取装置を示す斜視図、第５図は従来例に
係るコリメートレンズの正面図である。１１……レーザダイオード（発光素子）、１２
……回折格子、１３……ビームスプリツタ、１４
……コリメートレンズ、１５……全反射プリズム
、１６……対物レンズ、１７……ホトダイオード
（受光素子）、ｌ……コリメートレンズの長手方
向の幅、ｄ……コリメートレンズの短幅方向の寸
法。 FIG. 1 is a perspective view showing an information reading device for a compact disc player according to an embodiment of the present invention;
The figure is a front view of a collimating lens according to an embodiment, FIG. 3 is a front view of a collimating lens according to another embodiment, FIG. 4 is a perspective view showing an information reading device for a conventional compact disc player, and FIG. FIG. 3 is a front view of a collimating lens according to a conventional example. 11... Laser diode (light emitting element), 12
... Diffraction grating, 13 ... Beam splitter, 14
...Collimating lens, 15... Total reflection prism, 16... Objective lens, 17... Photodiode (light receiving element), l... Width in the longitudinal direction of the collimating lens, d... Dimension in the short width direction of the collimating lens.

Claims

[Scope of utility model registration request]

A light emitting element that emits a detection beam, a collimating lens that converts the detection beam into parallel light, an objective lens that faces the recording surface of the optical disk, a light receiving element that detects the reflected beam from the optical disk, and a reflected beam from the optical disk. In an information reading device for an optical disk player, the information reading device for an optical disk player is provided with a reflecting member that directs the detection beam toward the light receiving element, and the objective lens is corrected and driven in a direction to make the spot of the detection beam follow the recording track of the optical disk. An information reading device for an optical disc player, characterized in that the objective lens has a large width in a direction corresponding to the correction operation direction, and a small width in a direction orthogonal thereto.