Abstract:
The present invention provides a recording/reproducing method for a recording medium including a data recording layer and a user information recording layer, wherein the recording/reproducing method includes the steps of: receiving inputted user information; determining whether the inputted user information matches the user information recorded on the user information recording layer of the recording medium; and recording data onto the data recording layer of the recording medium, or reproducing data of the data recording layer, in accordance with the result of the determination.
Abstract:
According to the present invention, a method for adjusting the tilt of a recording medium comprises the steps of: installing the recording medium in a recording/reproducing apparatus; first compensating for the tilt in a state that the rotation of the recording medium is stopped; and second compensating tilt in a state that the recording medium is rotated.
Abstract:
The present invention provides a system and method for delivering laser beam, and a laser lift-off (LLO) method, one of the inevitable processes for fabricating a vertical type LED. A laser beam delivery system of the present invention comprises a laser beam source for emitting laser beam; a beam homogenizer for improving uniformity of energy intensity of the laser beam, the beam homogenizer comprising a microlens type fly-eye lens; a mask for masking a peripheral area of a cross section of the laser beam having penetrated the beam homogenizer at a focal plane; and an imaging lens for applying the laser beam to a unit irradiation area of a target. According to the present invention, the uniformity of energy intensity all over the beam spot is improved and thus the process yield is also remarkably increased. Besides, the beam transmittance is improved and thus the production per unit time is also raised. Further, the manufacturing process is simplified, the manufacturing cost is reduced, and thus the competitive power in LED market is improved.