Optical picking-up device able to detect stable error signal

Application Number: 00118370
Application Date: 2000.06.16
Publication Number: 1278096
Publication Date: 2000.12.27
Priority Information: 1999/6/18 KR 22917/99
International: G11B7/12;G11B7/135
Applicant(s) Name: Samsung Electronics Inc.
Inventor(s) Name: Lee Yung-Chae;Seung Pyong-Young;Ryuh Chang-Hun
Patent Agency Code: 11105
Patent Agent: li xiaoshu
Abstract An optical pickup device employing a signal detection unit including a hologram element having a plurality of pattern regions for diffracting and/or focusing light reflected and incident from a recording medium, a photodetector having a plurality of light receiving regions for receiving and photoelectrically converting the light diffracted by the hologram element and a signal operation unit for generating a focus error signal and/or a track error signal from a signal detected from the photodetector. The optical pickup device can implement a stable servo operation even at deviations of the photodetector, a change in the wavelength of light emitted from the light source, and/or shift of focusing means such as an objective lens, and can record and/or reproduce high-density information on/from the recording medium.