Optical disk retrieval device and method

1. An optical disk retrieval device that separates and retrieves a plurality of loaded optical disks one by one in order from top, said device comprising:

a base for loading the plurality of optical disks;

a pulling-up unit for pulling up the top optical disk of the plurality of loaded optical disks;

a separation member configured to cause a force to act on an inner wall of an inner hole of a plate-like member having the inner hole; and

a separation member elevating unit for moving the separation member in a vertical direction,

wherein the pulling-up unit is configured to lift the top optical disk upward,

wherein the separation member elevating unit is configured to pass the separation member through an inner circumferential hole of the top optical disk lifted by the pulling-up unit from an upper side to a lower side, and the separation member is configured to cause the force to act on the inner wall of the inner hole of the plate-like member adhering directly beneath the top optical disk to thereby separate the plate-like member;

wherein the separation member is formed of an elastic material or a spring member, and a diameter of the separation member is larger than a diameter of the inner hole of the plate-like member, and

wherein an outer edge portion of the separation member is configured to apply a frictional force on an upper portion of the inner wall of the inner hole of the plate-like member adhering directly beneath the top optical disk, by which the plate-like member can be separated from the top optical disk.

2. The optical disk retrieval device according to claim 1 , further comprising a sensor for detecting whether or not the plate-like member adheres directly beneath the top optical disk, when the top optical disk is lifted upward by the pulling-up unit,

wherein the separation member elevating unit is configured to, when the sensor detects that the plate-like member adheres directly beneath the top optical disk, pass the separation member through the inner circumferential hole of the top optical disk from the upper side to the lower side to separate the plate-like member.

3. The optical disk retrieval device according to claim 2 , wherein the sensor is a reflection type beam sensor for detecting whether or not the plate-like member adheres directly beneath the top optical disk by determining whether or not a projected optical beam returns as reflected light.

4. The optical disk retrieval device according to claim 2 ,

wherein the sensor is a transmission type beam sensor including a transmission type beam sensor projection portion and a transmission type beam sensor light-receiving portion, and

the transmission type beam sensor projection portion and the transmission type beam sensor light-receiving portion compose a sensor for detecting whether or not the plate-like member adheres directly beneath the top optical disk by determining whether or not an optical beam projected by the transmission type beam sensor projection portion is received by the transmission type beam sensor light-receiving portion.

5. The optical disk retrieval device according to claim 2 ,

wherein the sensor is a transmission type area sensor including a transmission type area sensor projection portion and a transmission type area sensor light-receiving portion, and

the transmission type area sensor projection portion and the transmission type area sensor light-receiving portion compose a sensor for detecting whether or not the plate-like member adheres directly beneath the top optical disk by the transmission type area sensor projection portion projecting a wide beam and the transmission type area sensor light-receiving portion measuring an amount of reaching light of the wide beam.

6. The optical disk retrieval device according to claim 1 , wherein the plate-like member is an optical disk.