JPS6273302U

JPS6273302U -

Info

Publication number: JPS6273302U
Application number: JP16253485U
Authority: JP
Priority date: 1985-10-23
Filing date: 1985-10-23
Publication date: 1987-05-11

Description

[Brief explanation of the drawing]

第１図はこの考案に係る光磁気記録再生装置を
示す概略断面図、第２図は第１図の光磁気記録再
生装置における光学系の概略構成を示す構成図、
第３図は第１図の光磁気記録再生装置における光
ヘツドの要部を示す概略断面図、第４図はこの考
案に係る磁界印加手段の構成を示す概略斜視図、
第５図はこの考案に係る透磁体を示す概略斜視図
、第６図は従来型の光磁気記録再生装置を示す概
略斜視図、第７図ａ及びｂは夫々第６図に示す光
磁気記録再生装置における磁極反転・切替え動作
を示す説明図、第８図は従来型の他の光磁気記録
再生装置の光ヘツドを示す概略断面図である。２……記録媒体、１……光ヘツド、３……ケー
シング、８……（半導体）レーザ、４……磁界印
加手段、４ｂ……通風孔、４ａ……放熱板、３ａ
……開口部、１２……対物レンズ、７……対物レ
ンズアクチユエータ、５……透磁体。 FIG. 1 is a schematic sectional view showing a magneto-optical recording and reproducing device according to the invention, and FIG. 2 is a configuration diagram showing a schematic configuration of an optical system in the magneto-optical recording and reproducing device of FIG. 1.
3 is a schematic sectional view showing the main parts of the optical head in the magneto-optical recording and reproducing apparatus of FIG. 1; FIG. 4 is a schematic perspective view showing the configuration of the magnetic field applying means according to the invention;
FIG. 5 is a schematic perspective view showing a magnetically permeable body according to this invention, FIG. 6 is a schematic perspective view showing a conventional magneto-optical recording and reproducing device, and FIGS. 7 a and b are respectively FIG. 8 is a schematic cross-sectional view showing an optical head of another conventional magneto-optical recording/reproducing apparatus. 2... Recording medium, 1... Optical head, 3... Casing, 8... (semiconductor) laser, 4... Magnetic field applying means, 4b... Ventilation hole, 4a... Heat sink, 3a
...Aperture, 12...Objective lens, 7...Objective lens actuator, 5...Magnetic permeable body.

Claims

[Claims for Utility Model Registration] Recording and erasing of information by applying a constant magnetic field to the recording medium by a magnetic field applying means and irradiating the recording medium with a laser beam using a laser provided in the casing of an optical head. In the magneto-optical recording and reproducing apparatus, the magnetic field applying means communicates between the inside and outside of the casing, and the magnetic field applying means communicates between the inside and the outside of the casing. A substantially donut-shaped heat sink has a ventilation hole formed along the circumferential direction, and a coil attached to the heat sink for applying a magnetic field to the recording medium, and the magnetic field applying means is connected to the opening of the casing. an objective lens actuator that is attached to the outer surface of the casing so as to surround the casing, and includes an objective lens that protrudes outward from an opening formed on one surface of the casing that faces the recording medium;
A magnetically permeable body having a high magnetic permeability is provided in a certain direction of the recording medium so as to be slidably and rotatably attached to the inside of the casing so as to substantially face the magnetic field applying means to the recording medium. A magneto-optical recording and reproducing device.