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Optical pickup using an optical phase plate
| Details |
Inventors: Yoo, Jang Hoon; Lee, Chul Woo; Chung, Chong Sam; Seong, Pyong Yong; Cho, Kun Ho; Choi, Hyun Seob; Lee, Yong Hoon; Kim, Tae Kyung; Park, No Kyong;
Assignee: Samsung Electronic Co., Ltd. (Kyungki-do, KR)
Primary Examiner: Edun; Muhammad
Assistant Examiner:
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak & Seas, PLLC
A recording/reproducing apparatus includes an optical pickup device having an optical phase plate which is compatible with optical recording mediums having different thicknesses, and an optical signal processing device processes information read from the optical recording mediums and processes information to be recorded thereon using the optical pickup device. |
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DETAILED DESCRIPTION An object of the present invention is to provide an optical pickup apparatus which is compatible with a digital video disk and a recordable compact disk by removing a spherical aberration using a phase plate.
Another object of the present invention is to provide a recording/reproducing apparatus having an optical signal processing device which processes information read from the optical recording mediums and processes information to be recorded thereon using the optical pickup device.
To accomplish the above object of the present invention, there is provided an optical pickup apparatus for at least two optical recording media, which are different in distance from an optical pickup to information recording surfaces and uses light beams of different wavelengths for recording and reading information, the optical pickup apparatus includes: a plurality of laser light sources for emitting a first light beam having a relatively shorter wavelength and a second light beam having a relatively longer wavelength, respectively; an objective lens having a predetermined focal length in which the focal point of the objective lens according to the first light beam coincides with the position of the information recording surface in a first optical recording medium having the information recording surface closer to the objective lens; optical detection means; means for controlling an optical path so that the light beam emitted from the laser light sources is directed to the objective lens and the light output from the objective lens is directed to the optical detection means; and phase shift means, coupled between the optical path control means and the objective lens, for shifting the phase of the second light beam proceeding from the optical path control means to the objective lens, thereby reducing the size of a beam spot which is formed on the position of information recording surface in the second optical recording medium having the information recording surface farther from the objective lens by the second light beam focussed by the objective lens, wherein a wavelength of one of the first light and second light beams is used according to the optical recording medium used
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