Patent ID: 6167003
Filing Date: 2000-12-26
Classification: G11B

Abstract:
An optical disc apparatus comprising:a first and a second laser resonating and detecting device each emitting a laser beam having a wavelength according to the type of an optical disc and receiving a beam reflected from the optical disc via a first and a second objective lens, respectively, both the first and second objective lenses being mounted on a bobbin; anda base on which at least the first and second objective lenses and the first and second laser resonating and detecting devices are mounted, the base being transferable in a direction of the radius of the optical disc, the center of the first objective lens being located for the laser beam to track a first line passing through the center of the optical disc, the first and second objective lenses being switched according to the type of the optical disc without mechanical switching of the objective lenses,wherein a center line passing through the centers of the first and second objective lenses is inclined toward the center of. the optical disc by a predetermined angle from a second line that passes through the center of the first objective lens and is orthogonal to the first line so that the center line is deviated from tangents of tracks of the optical disc by plus or minus 7 degrees or less.