Title:
OPTICAL PICKUP, OPTICAL DRIVE DEVICE, LIGHT IRRADIATION METHOD
Document Type and Number:
WIPO Patent Application WO/2011/125565
Kind Code:
A1
Abstract:
Disclosed are an optical pickup, an optical drive device, and a light irradiation method capable of suppressing the degree of a spot displacement Δx. The optical pickup irradiates an optical recording medium which includes a reference surface and a recording layer through a common object lens for irradiating a first light used to record or reproduce information in the recording layer and a second light which is different from the first light, and adjusts a focus position of the first light irradiated through the object lens by changing the collimation of the first light to be incident on the object lens so as to suppress the spot displacement Δx between the first light and the second light to be generated in response to an eccentricity of the recording medium, wherein the reference surface has a reflective membrane which has a position guiding portion formed in a spiral shape, and the recording layer is provided in a layer position which is different from that of the reference surface and records information by forming a mark corresponding to irradiated light. The magnification of the second light is within the magnification range of the first light.
Inventors:
MIYAMOTO Hirotaka (1-7-1 Konan, Minato-k, Tokyo 75, 〒1080075, JP)
宮本 浩孝 (〒75 東京都港区港南１丁目７番１号 ソニー株式会社内 Tokyo, 〒1080075, JP)
SAITO Kimihiro (1-7-1 Konan, Minato-k, Tokyo 75, 〒1080075, JP)
宮本 浩孝 (〒75 東京都港区港南１丁目７番１号 ソニー株式会社内 Tokyo, 〒1080075, JP)
SAITO Kimihiro (1-7-1 Konan, Minato-k, Tokyo 75, 〒1080075, JP)
Application Number:
JP2011/057484
Publication Date:
October 13, 2011
Filing Date:
March 26, 2011
Export Citation:
Assignee:
SONY CORPORATION (1-7-1, Konan Minato-k, Tokyo 75, 〒1080075, JP)
ソニー株式会社 (〒75 東京都港区港南１丁目７番１号 Tokyo, 〒1080075, JP)
MIYAMOTO Hirotaka (1-7-1 Konan, Minato-k, Tokyo 75, 〒1080075, JP)
宮本 浩孝 (〒75 東京都港区港南１丁目７番１号 ソニー株式会社内 Tokyo, 〒1080075, JP)
ソニー株式会社 (〒75 東京都港区港南１丁目７番１号 Tokyo, 〒1080075, JP)
MIYAMOTO Hirotaka (1-7-1 Konan, Minato-k, Tokyo 75, 〒1080075, JP)
宮本 浩孝 (〒75 東京都港区港南１丁目７番１号 ソニー株式会社内 Tokyo, 〒1080075, JP)
International Classes:
G11B7/135; G11B7/09; G11B7/125
Attorney, Agent or Firm:
INAMOTO Yoshio et al. (711 Building 4F, 11-18 Nishi-Shinjuku 7-chome, Shinjuku-k, Tokyo 23, 〒1600023, JP)
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Claims:
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