JPH03121521U

JPH03121521U -

Info

Publication number: JPH03121521U
Application number: JP2508690U
Authority: JP
Priority date: 1990-03-15
Filing date: 1990-03-15
Publication date: 1991-12-12

Description

[Brief explanation of drawings]

第１図ａは本考案の一実施例における光デイス
ク情報読取装置の構成図、第１図ｂは同部分拡大
図、第２図ａは従来の装置の特性を示す図、第２
図ｂは本考案の装置の特性を示す図、第３図は従
来の光電変換素子と光軸の関係を示す図、第４図
は従来例での光電変換素子の受光面でのスポツト
の挙動を示す図である。１……半導体レーザー、２……回折格子、３…
…ビームスプリツタ、４……コリメートレンズ、
５……対物レンズ、６……デイスク、７……検出
レンズ、８……光電変換素子、Ｌ……光軸。 FIG. 1a is a block diagram of an optical disc information reading device according to an embodiment of the present invention, FIG. 1b is a partially enlarged view of the same, FIG. 2a is a diagram showing the characteristics of a conventional device,
Figure b is a diagram showing the characteristics of the device of the present invention, Figure 3 is a diagram showing the relationship between a conventional photoelectric conversion element and the optical axis, and Figure 4 is a diagram showing the behavior of a spot on the light receiving surface of a conventional photoelectric conversion element. FIG. 1... Semiconductor laser, 2... Diffraction grating, 3...
...Beam splitter, 4...Collimating lens,
5... Objective lens, 6... Disk, 7... Detection lens, 8... Photoelectric conversion element, L... Optical axis.

Claims

[Scope of utility model registration request]

At least the light source is a laser, an objective lens,
An optical disk information reading device equipped with a beam splitter and a photoelectric conversion element, in which a spot is irradiated onto the light receiving surface of the photoelectric conversion element, and a spot where the spot is also reflected on the light receiving surface and is irradiated onto the light receiving surface again. An optical disk information reading device, characterized in that the photoelectric conversion element and the optical axis of the light incident thereon are mounted at an angle so as to prevent interference from occurring.