Title:
DISC DEVICE
Document Type and Number:
WIPO Patent Application WO/2011/104756
Kind Code:
A1
Abstract:
A disc device identifies, based on the amount of eccentricity at each predetermined rotation phase of one revolution of an optical disc (1), the rotation phase range at which the lens shift amount after pulling in of tracking of an objective lens of an optical pickup (3) does not exceed the movement range of a preset tracking direction of the objective lens, sets the rotation shift range as a tracking pull-in range, and executes tracking pull-in of the optical pickup (3) when the rotation shift of the optical disc (1) is within the tracking pull-in range.
Inventors:
HOSHINO, Hiroshi (7-3 Marunouchi 2-chome, Chiyoda-k, Tokyo 10, 〒1008310, JP)
星野洋史 (〒10 東京都千代田区丸の内二丁目７番３号 三菱電機株式会社内 Tokyo, 〒1008310, JP)
星野洋史 (〒10 東京都千代田区丸の内二丁目７番３号 三菱電機株式会社内 Tokyo, 〒1008310, JP)
Application Number:
JP2010/001279
Publication Date:
September 01, 2011
Filing Date:
February 25, 2010
Export Citation:
Assignee:
Mitsubishi Electric Corporation (7-3 Marunouchi 2-chome, Chiyoda-ku Tokyo, 10, 〒1008310, JP)
三菱電機株式会社 (〒10 東京都千代田区丸の内二丁目７番３号 Tokyo, 〒1008310, JP)
HOSHINO, Hiroshi (7-3 Marunouchi 2-chome, Chiyoda-k, Tokyo 10, 〒1008310, JP)
三菱電機株式会社 (〒10 東京都千代田区丸の内二丁目７番３号 Tokyo, 〒1008310, JP)
HOSHINO, Hiroshi (7-3 Marunouchi 2-chome, Chiyoda-k, Tokyo 10, 〒1008310, JP)
International Classes:
G11B7/085; G11B7/095
Attorney, Agent or Firm:
TAZAWA, Hideaki et al. (Akasaka Sanno Center Bldg. 5F, 12-4 Nagata-cho 2-chome, Chiyoda-k, Tokyo 14, 〒1000014, JP)
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Claims: