OPTICAL PICKUP, DETECTION METHOD OF FOCUS ERROR SIGNAL AND TRACKING ERROR SIGNAL OF OPTICAL PICKUP, OPTICAL INFORMATION DEVICE, COMPUTER, VIDEO RECORDING AND REPRODUCING DEVICE, SERVER AND CAR NAVIGATION SYSTEM

摘要

PROBLEM TO BE SOLVED: To solve a problem that a piece of large scale information is not stable recorded and reproduced on/from an optical recording medium by conventional optical pickups which perform recording and reproducing of a piece of information on/from an optical recording medium by using near-field light which is generated by irradiating a scatterer with a beam of light emitted from a light source due to lack of a method to control the position of a scatterer to a desired position on an optical recording medium.;SOLUTION: A third scatterer and a fourth scatterer are disposed between a second scatterer and a fifth scatterer, and further being sandwiched by a first scatterer and a sixth scatterer. A focus error signal representing a gap interval between the third scatterer or the fourth scatterer and the optical recording medium is detected from the signals obtained from the first scatterer and the sixth scatterer. A tracking error signal representing a positional relation between the third scatterer or the fourth scatterer and a desired position for recording or reproducing the information on/from the optical recording medium is detected from the signals obtained from the second scatterer and the fifth scatterer.;COPYRIGHT: (C)2013,JPO&INPIT