JPS6399316U - - Google Patents

Description

【図面の簡単な説明】[Brief explanation of drawings]

第１図ないし第４図はこの考案の一実施例を示
すもので、第１図は概略側面図、第２図ａはスペ
ーサの平面図、第２図ｂはスペーサの側面図、第
３図はスペーサ回転角―半導体レーザ傾き特性図
、第４図は半導体レーザ傾き―トラツク制御信号
誤差特性図、第５図は従来例を示す光ピツクアツ
プ光学系の側面図、第６図はトラツク用の検出素
子の正面図、第７図はトラツクエラー検出動作を
示す説明図、第８図はトラツク信号の波形図、第
９図はフアーフイールドパターン特性図、第１０
図は説明図、第１１図はトラツク制御信号に誤差
を生ずる理由を示す説明図である。 １……半導体レーザ、５……対物レンズ、６…
…光情報記録媒体、１２……光ピツクアツプ本体
、１５……スペーサ。 Figures 1 to 4 show an embodiment of this invention, in which Figure 1 is a schematic side view, Figure 2a is a plan view of the spacer, Figure 2b is a side view of the spacer, and Figure 3 is a side view of the spacer. is a spacer rotation angle vs. semiconductor laser tilt characteristic diagram, FIG. 4 is a semiconductor laser tilt vs. track control signal error characteristic diagram, FIG. 5 is a side view of a conventional optical pickup optical system, and FIG. 6 is a track detection diagram. 7 is an explanatory diagram showing the track error detection operation, FIG. 8 is a waveform diagram of the track signal, FIG. 9 is a far-field pattern characteristic diagram, and FIG. 10 is a front view of the element.
The figure is an explanatory diagram, and FIG. 11 is an explanatory diagram showing the reason why an error occurs in the track control signal. 1... Semiconductor laser, 5... Objective lens, 6...
. . . Optical information recording medium, 12 . . . Optical pickup body, 15 . . . Spacer.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 光情報記録媒体と、レーザ光を射出する半導体
レーザと、前記レーザ光を前記光情報記録媒体上
に微小スポツトとして集光させる対物レンズとを
備えた光ピツクアツプ装置において、前記対物レ
ンズを備えた光ピツクアツプ本体と前記半導体レ
ーザとの間に断面形状を所定角度に拡開したくさ
び状に形成し平面形状をドーナツ状に形成したス
ペーサを設けたことを特徴とする光ピツクアツプ
装置。 In an optical pickup device that includes an optical information recording medium, a semiconductor laser that emits a laser beam, and an objective lens that focuses the laser beam as a minute spot on the optical information recording medium, the optical pickup device that includes the objective lens An optical pickup device characterized in that a spacer is provided between the pickup main body and the semiconductor laser, the spacer having a wedge-shaped cross section expanded at a predetermined angle and a donut-shaped planar shape.