Title:
MULTI-LAYER OPTICAL RECORDING MEDIUM
Document Type and Number:
WIPO Patent Application WO/2011/114674
Kind Code:
A1
Abstract:
A problem is to prevent multiple beam interference which is a practical problem caused by stray light, in relation to a multi-layer optical recording medium having N (N ≥ 5) number of boundary surfaces where incident light could be reflected. To resolve that problem, each boundary surface of M units (M ≤ N) elected from an N number of boundary surfaces is defined as Li (i = 0, 1, … M; at this time, as the value of i is smaller, the boundary surface formed at a bottom layer side looking from an uppermost surface as a light incidence plane), and when j < k ≤ l < m ≤ M, satisfy a condition that a difference of the total sum of Sj - k of spacer thicknesses formed between the boundary surfaces of Lj and Lk, and the total sum of Sl - m │Sj-k − Sl-m│ of spacer thicknesses formed between the boundary surfaces of Ll and Lm, is larger than nλ/NA2 (n = refraction index of the spacer) for the boundary surface Lk, boundary surface Lm, boundary surface Ll, and boundary surface Lj that generate stray light by reflecting three times via Lk (or Ll) → Lm → Ll (or Lk), when light is converged at an object lens of a numerical aperture NA by a wavelength λ with boundary surface Lj as a target.
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Inventors:
SAKAMOTO, Tetsuhiro (1-7-1 Konan Minato-k, Tokyo 75, 〒1080075, JP)
坂本 哲洋 (〒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)
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)
坂本 哲洋 (〒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)
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)
Application Number:
JP2011/001429
Publication Date:
September 22, 2011
Filing Date:
March 11, 2011
Export Citation:
Assignee:
SONY CORPORATION (1-7-1 Konan, Minato-ku 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)
SAKAMOTO, Tetsuhiro (1-7-1 Konan Minato-k, Tokyo 75, 〒1080075, JP)
坂本 哲洋 (〒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)
MIYAMOTO, Hirotaka (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)
SAKAMOTO, Tetsuhiro (1-7-1 Konan Minato-k, Tokyo 75, 〒1080075, JP)
坂本 哲洋 (〒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)
MIYAMOTO, Hirotaka (1-7-1 Konan Minato-k, Tokyo 75, 〒1080075, JP)
International Classes:
G11B7/24
Attorney, Agent or Firm:
OMORI, Junichi (2nd Floor U&M Akasaka Bldg, 7-5-47 Akasaka Minato-k, Tokyo 52, 〒1070052, JP)
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