JPH0280318U

JPH0280318U -

Info

Publication number: JPH0280318U
Application number: JP15733588U
Authority: JP
Priority date: 1988-12-02
Filing date: 1988-12-02
Publication date: 1990-06-20

Description

[Brief explanation of drawings]

第１図は本考案に係る光学式情報記録・再生装
置の光ヘツド構造の一実施例の概略構成を示す斜
視図、第２図はその―矢視図、第３図Ａ，Ｂ
，Ｃは夫々他の実施例を示す図、第４図はモニタ
用フオトダイオード位置決め当て付け部と当該全
反射プリズムを一体に形成した実施例である全反
射プリズムの斜視図、第５図は従来例の斜視図で
ある。１…半導体レーザ（レーザ光源）、４…ビーム
スプリツタ（光路分割素子）、１１…全反射プリ
ズム、１１Ａ…入射面（全反射プリズムの光学面
）、１１Ｂ…反射面（全反射プリズムの光学面）
、１１Ｃ…出射面（全反射プリズムの光学面）、
１１Ｄ・１１Ｅ…位置決め当て付け部（モニタ光
検出器位置決め部）、１１Ｆ…取付部、１３…モ
ニタ用フオトダイオード（モニタ光検出器）、２
０…レーザビーム（レーザ光源からのレーザ光）
、２２…反射レーザビーム（光路分割素子により
屈折されて当該光路分割素子から外部に出射する
レーザ光）。 FIG. 1 is a perspective view showing a schematic configuration of an embodiment of the optical head structure of an optical information recording/reproducing apparatus according to the present invention, FIG. 2 is a view thereof in the direction of the arrow, and FIGS.
, C are diagrams showing other embodiments, FIG. 4 is a perspective view of a total reflection prism, which is an embodiment in which a monitor photodiode positioning part and the total reflection prism are integrally formed, and FIG. 5 is a conventional one. FIG. 3 is a perspective view of an example. 1...Semiconductor laser (laser light source), 4...Beam splitter (optical path splitter), 11...Total reflection prism, 11A...Incidence surface (optical surface of total reflection prism), 11B...Reflection surface (optical surface of total reflection prism) )
, 11C...output surface (optical surface of total reflection prism),
11D/11E...Positioning abutment part (monitor photodetector positioning part), 11F...Mounting part, 13...Monitor photodiode (monitor photodetector), 2
0...Laser beam (laser light from a laser light source)
, 22...Reflected laser beam (laser light that is refracted by an optical path splitting element and emitted from the optical path splitting element to the outside).

Claims

[Claims for Utility Model Registration] (1) Information is recorded by irradiating a laser beam from a laser light source onto an optical disk information surface via an optical path splitting element, and the reflected laser beam from the optical disk information surface is used to An optical head structure of an optical information recording/reproducing device that is bent by an optical path splitting element and guided to a photodetector, in which a laser is emitted from a laser light source, bent by the optical path splitting element, and emitted from the optical path splitting element to the outside. The light is bent by a total reflection prism made of optical plastic and guided to a monitor photodetector, and the output of the laser light source is controlled based on the output of laser light detected by the monitor photodetector. Optical head structure of optical information recording/reproducing device. (2) A claim characterized in that at least one of the optical surfaces of the total reflection prism formed of the optical plastic is formed into a convex shape, so that the total reflection prism has a condensing effect for the laser beam. term(1
) The optical head structure of the optical information recording/reproducing device described in ). (3) The optical head structure of the optical information recording/reproducing apparatus according to claim (1), characterized in that the monitor photodetector positioning section is integrally formed with the total reflection prism formed of the optical plastic. . (4) The optical information recording/reproducing device according to claim (1), characterized in that the total reflection prism formed of the optical plastic is integrally formed with a mounting portion for fixing the total reflection prism. optical head structure.