Patent ID: 8095945
Filing Date: 2012-01-10
Classification: G11B

Abstract:
1. An optical disc drive comprising: a rotation device that rotates an optical disc in a clockwise direction when an upper surface of said optical disc is viewed by engaging an inside of an inner diameter of said optical disc; a disc mounting portion for mounting of said optical disc thereon has a recess portion of a size slightly larger than a size of said optical disc so as to delimit a position where said optical disc is mounted thereon; and an optical pickup which irradiates a laser beam on a lower recording surface of said optical disc so as to enable recording or reproducing information thereon, and said optical pickup being movable in a radial moving area direction of said optical disc; wherein said disc mounting portion includes a first penetrating opening portion therethrough that extends from a center area of said recess portion to a periphery of said recess portion including said rotation device and said optical pickup moving area, thereby enabling engagement of said rotation device with said optical disc and irradiation of the laser beam onto said optical disc therethrough; wherein said disc mounting portion includes a disc mounting convex portion which guides mounting of said optical disc within said disc mounting portion, said disc mounting convex portion having a disc mounting cutout portion, and wherein said disc mounting convex portion is formed so as to be interrupted at right and left sides of said disc mounting convex portion as viewed from a front of said disc mounting portion; wherein said disc mounting portion includes only a single second penetrating opening portion therethrough being provided at a rear of said disc mounting portion and periphery, said only single second penetrating opening portion being provided only at one portion of the rear of the disc mounting portion which is at an upstream side of the clockwise rotating direction of said optical disc with respect to a center line of said first penetrating opening portion extending from the front to the rear of said disc mounting portion so as to guide airflow caused by rotation of said optical disc into an inside of said optical disc drive; wherein said only single second penetrating opening portion is provided at an outer peripheral side of said optical disc so as not to be located just under or on a side surface of said optical disc and to be located on only one side of the center line without a corresponding penetrating opening portion being located on an opposite side of the center line; wherein said only single second penetrating opening portion has first and second sections, wherein said first section has a substantially constant width and said second section has a width which decreases in a direction towards said recess portion; wherein said only single second penetrating opening portion enables the airflow caused by the clockwise rotation of said optical disc to flow out from said disc mounting cutout portion and pass through said single second penetrating portion; and wherein said disc mounting portion includes at least one third penetrating opening portion therethrough being provided at the front of said disc mounting portion in said recess portion thereof.