JPS6273327U

JPS6273327U -

Info

Publication number: JPS6273327U
Application number: JP16253785U
Authority: JP
Priority date: 1985-10-23
Filing date: 1985-10-23
Publication date: 1987-05-11
Anticipated expiration: 2000-10-23
Also published as: JPH0725863Y2

Description

[Brief explanation of the drawing]

第１図はこの考案に係る光記録再生装置用光ヘ
ツドの概略構成を示す構成図、第２図はこの考案
に係る光記録再生装置用光ヘツドによつて再生時
にレーザ光線を記録部分に照射させるときの状態
を示す説明図、第３図ａ及びｂは夫々この考案に
係るウオブリング手段の取付状態を示す概略平面
図及び概略断面図、第４図はこの考案に係るウオ
ブリング手段を作動させるときの作動タイミング
を説明する説明図、第５図はこの考案に係るウオ
ブリング手段によつてレーザ光線が振動するとき
の光強度の変化を示す説明図、第６図は従来型光
記録基生装置用光ヘツドによつて情報記録及び再
生する際のレーザの出力とそのときの記録の媒体
の特性を示すグラフ、第７図はレーザ光線の光強
度分布を示すグラフである。１……レーザ、２……対物レンズ、５……記録
媒体、７……記録部分、４……ウオブリング手段
、３……（４５°）ミラー。 FIG. 1 is a block diagram showing a schematic configuration of an optical head for an optical recording/reproducing device according to this invention, and FIG. 2 is a block diagram showing the structure of the optical head for an optical recording/reproducing device according to this invention, which irradiates a recorded portion with a laser beam during reproduction. FIGS. 3a and 3b are a schematic plan view and a schematic sectional view showing the installed state of the wobbling means according to this invention, respectively. FIG. 4 is an explanatory diagram showing the state when the wobbling means according to this invention is operated. FIG. 5 is an explanatory diagram showing the change in light intensity when the laser beam is vibrated by the wobbling means according to this invention. FIG. FIG. 7 is a graph showing the laser output when information is recorded and reproduced by an optical head and the characteristics of the recording medium at that time. FIG. 7 is a graph showing the light intensity distribution of the laser beam. DESCRIPTION OF SYMBOLS 1... Laser, 2... Objective lens, 5... Recording medium, 7... Recording part, 4... Wobbling means, 3... (45°) mirror.

Claims

[Claims for Utility Model Registration] 1. A system comprising an optical system such as a laser and an objective lens, recording information on a recording medium by irradiating the laser beam emitted from the laser, and recording the information by a tracking control means, etc. In an optical head for an optical recording and reproducing device that can reproduce information from a recorded portion on a track by irradiating a laser beam onto a track of a medium, the laser beam is vibrated by the tracking control means when reproducing information. In order to further superimpose and oscillate the laser beam, the laser beam is
An optical recording and reproducing apparatus characterized in that it is provided with a wobbling means that vibrates at a frequency higher than the frequency of at least the tracking control means, and is configured to irradiate the recording portion of the recording medium with the peripheral side of the laser beam. Light head for use. 2. A utility model registration claim in which the wobbling means are provided in a pair on both ends of the back surface of a mirror installed on a part of the optical path from the laser to the objective lens, and are configured to operate with a phase shift of half a wavelength from each other. An optical head for an optical recording/reproducing device according to item 1. 3. The scope of the utility model registration claim, in which the frequency when the wobbling means is activated to vibrate the laser beam is three times or more the frequency when the tracking control means is activated and the laser beam is vibrated. An optical head for an optical recording/reproducing device according to item 1 or 2.