Patent ID: 7652956

Claim:
A disc drive comprising: a housing having formed at a front side thereof a disc slot through which each of large- and small-diameter optical discs different in outside diameter from each other is introduced and ejected; a base unit including a base on which there are provided together a disc mount onto which the optical disc introduced from the disc slot into the housing is to be set, a disc rotation driving mechanism to drive, by rotation, the optical disc set on the disc mount, an optical pickup to write or read information signals to the optical disc being rotated by the disc rotation driving mechanism while irradiating a light beam condensed by an objective lens to the signal recording surface of the optical disc and a pickup moving mechanism to move the optical pickup radially of the optical disc; and a disc carrying mechanism to selectively carry optical discs having different outside diameters between a disc insertion/ejection position where the disc is inserted or ejected from the disc slot and a disc setting position where the optical disc is to be set, the optical pickup including an objective lens moving mechanism to move the objective lens at least in a direction parallel to the optical axis of the objective lens and a driving control circuit that controls the objective lens moving mechanism to retreat the objective lens in a direction away from the signal recording surface of a small-diameter one of small- and large-diameter optical discs different in outside diameter from each other, which is set on the disc mount, when the pickup moving mechanism moves the optical pickup between the outer and inner radii of the small-diameter optical disc.