JPS61167030U

JPS61167030U -

Info

Publication number: JPS61167030U
Application number: JP4917785U
Authority: JP
Priority date: 1985-04-02
Filing date: 1985-04-02
Publication date: 1986-10-16

Description

[Brief explanation of the drawing]

第１図は本考案によるコンパチブル光ヘツドの
一実施例を示す構成図、第２図ａ〜ｇは本考案に
よるコンパチブル光ヘツドの一実施例の動作を示
す線図、第３図は従来のコンパチブル光ヘツドの
構成図である。１はレーザ光源、２はコリメートレンズ、３は
偏光素子、４はフアラデー効果素子、２１は磁石
、５は施光子、６はビームスプリツタ、７は収束
レンズ、８は記録媒体、９は検光子、１０は光磁
気記録用信号検出器、１１，１８はハーフミラー
、１２は光記録用信号検出器、１９はフオーカス
サーボ用検出器、２０はトラツクサーボ用検出器
、２２はナイフエツジ、２３〜２５は収束レンズ
、１４はレーザ光源の放射光、１５は記録媒体か
らの反射光である。 FIG. 1 is a block diagram showing an embodiment of a compatible optical head according to the present invention, FIGS. 2 a to g are diagrams showing the operation of an embodiment of a compatible optical head according to the present invention, and FIG. FIG. 2 is a configuration diagram of an optical head. 1 is a laser light source, 2 is a collimating lens, 3 is a polarizing element, 4 is a Faraday effect element, 21 is a magnet, 5 is a photonic element, 6 is a beam splitter, 7 is a converging lens, 8 is a recording medium, 9 is an analyzer , 10 is a signal detector for magneto-optical recording, 11 and 18 are half mirrors, 12 is a signal detector for optical recording, 19 is a focus servo detector, 20 is a track servo detector, 22 is a knife edge, 23- 25 is a converging lens, 14 is radiation light from a laser light source, and 15 is reflected light from a recording medium.

Claims

[Scope of utility model registration request]

In an optical head for optically recording, reproducing, or erasing information on a recording medium, a laser light source and a polarizing element that guide mutually orthogonal polarized components of incident light to different optical paths and a predetermined ratio of the intensity of the incident light are used. A beam splitter that divides the beam into two and guides each optical path to a different optical path, and a converging lens that is installed so that the emitted light from the laser light source is approximately perpendicularly incident on the recording medium are arranged in order, and the polarizing element and the beam splitter are arranged in order. A Faraday effect element that irreversibly rotates the polarization plane of transmitted light by approximately 45 degrees with respect to the traveling direction of the incident light, and a Faraday effect element that irreversibly rotates the polarization plane of the transmitted light by approximately 45 degrees with respect to the traveling direction of the incident light. means for detecting the intensity of the reflected light that changes depending on the recording state of the recording medium, and a polarization direction of the reflected light that changes depending on the recording state of the recording medium, comprising: an optical rotator that rotates a surface by approximately 45 degrees An optical head characterized in that it is equipped with means for independently detecting changes in the optical head.