Title:
OPTICAL PICK-UP, OPTICAL INFORMATION RECORDING AND PLAYBACK DEVICE, COMPUTER DEVICE, AND OPTICAL DISC RECORDER
Document Type and Number:
WIPO Patent Application WO/2011/111381
Kind Code:
A1
Abstract:
Disclosed is a an optical pick-up which can stably detect with high accuracy the relative angle of inclination between the end face of a solid immersion lens (SIL) and the surface of an optical recording medium. Also disclosed are an optical information recording and playback device, a computer device, and an optical disc recorder. The centre of a first beam and the centre of a second beam are at different locations on the end face of an SIL (108b). A beam splitter (106) is disposed between a beam expander (105) and an objective lens optical system (108). A photodetector (121) comprises a first light reception region which receives light from the first convergent beam, and a second light reception region which receives light from the second convergent beam, and the relative angle of inclination between the tip surface of the SIL (108b) and the surface of an optical disk (200) is detected on the basis of the difference between the amount of light received in the first light reception region and the second light reception region.
Inventors:
SANO, Kousei (())
佐野 晃正 (())
佐野 晃正 (())
Application Number:
JP2011/001373
Publication Date:
September 15, 2011
Filing Date:
March 09, 2011
Export Citation:
Assignee:
PANASONIC CORPORATION (1006, Oaza Kadoma Kadoma-sh, Osaka 01, 〒5718501, JP)
パナソニック株式会社 (〒01 大阪府門真市大字門真１００６番地 Osaka, 〒5718501, JP)
SANO, Kousei (())
パナソニック株式会社 (〒01 大阪府門真市大字門真１００６番地 Osaka, 〒5718501, JP)
SANO, Kousei (())
International Classes:
G11B7/135
Attorney, Agent or Firm:
KOTANI, Etsuji et al. (Osaka Nakanoshima Building 2nd Floor, 2-2 Nakanoshima 2-chome, Kita-ku, Osaka-sh, Osaka 05, 〒5300005, JP)
Claims:
Previous Patent: METHOD FOR PRODUCING CARBONIZED FILM AND METHOD FOR PRODUCING GRAPHITE FILM
Next Patent: REFRIGERATOR
Next Patent: REFRIGERATOR