Patent ID: 7808866

Claim:
An apparatus for recording/reproducing data on/from a recording medium, the apparatus comprising: a pickup unit including an objective lens and a solid immersion lens (SIL) and transmitting light onto a recording medium; a plurality of photoelectric elements for receiving the light reflected from the recording medium to output a controlling signal, each of the plurality of photoelectric elements including a plurality of photo-detecting regions, each of the plurality of photo-detecting regions independently detecting an amount of the reflected light; and a controller controlling the pickup unit, using the controlling signal output from the plurality of photoelectric elements, wherein the controlling signal includes a tilting error signal according to skew of the recording medium, and the tilting error signal is obtained by calculating a difference between one signal detected by one of the plurality of photoelectric elements and another signal detected by another one of the plurality of photoelectric elements, and wherein the one signal detected by the one of the plurality of photoelectric elements and the another signal detected by the another one of the plurality of photoelectric elements are obtained based on a difference between the amount of the reflected light detected by each of the plurality of photo-detecting regions, wherein the plurality of photoelectric elements comprises: a first photoelectric element which constitutes a radio frequency (RF) optical block for obtaining an RF signal from the light reflected by the recording medium, a signal obtained by the first photoelectric element being used to obtain the tilting error signal of the recording medium and to detect the RF signal; and a second photoelectric element which constitutes a servo optical block for detecting the tilting error signal of the recording medium having a difference in a moving path with respect to light incident from the first photoelectric element of the light reflected by the recording medium.