Optical pickup apparatus and objective lens

Details Optical pickup apparatus and objective lens Optical pickup apparatus and objective lens

G - Physics

11

B

G11B 7/135 (2006.01) G02B 5/18 (2006.01) G11B 7/125 (2006.01) G11B 7/00 (2006.01)

Patent

CA 2426072

An objective lens of an optical pickup apparatus converges a divergent light flux onto an information recording surface. The following conditional formula is satisfied: |.delta.SA1/.delta.U| .bullet. |.delta.U| + |.delta.SA2/.delta.T| .bullet. |.delta.T| <= 0.07 .lambda.rms where .lambda. represents a wavelength of a light source, .delta.SA1/.delta.U represents a change of a spherical aberration for an object-to-image distance change .delta.U (|.delta.U| <= 0.05 mm) and .delta.SA2/.delta.T represents a change of spherical aberration for a temperature change .delta.T (|.delta.T| <= 30~C), the object-to-image distance is a distance between the light source (a light emitting point) and the information recording surface.

L'invention concerne une lentille d'objectif d'un appareil de lecture optique convergeant un flux de lumière divergent sur une surface d'enregistrement d'information. La formule conditionnelle suivante est garantie: |.delta.SA¿1?/.delta.U| .bullet., |.delta.U + |.delta.SA¿2?/.delta.T| .bullet. |.delta.T| <= 0,07 .lambda.rms, .lambda. représentant une longueur d'onde d'une source de lumière, .delta.SA¿1?/.delta.U représentant un changement d'une aberration spherique pour un changement de distance objet-image .delta.U (?.delta.U?<= 0,5mm) et |.delta.SA¿2?/.delta.T représentant un changement d'aberration sphérique pour un changement de température .delta.T (|.delta.T| <= 30·C), la distance objet-image étant une distance entre la source de lumière (un point d'émission de lumière) et la surface d'enregistrement d'information.

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