Multilayer optical disk

(54) MULTILAYER OPTICAL DISK

(75) Inventors: Masahiko Kaneko, Kanagawa;

Nobuhiko Umezu; Katsuhisa Aratani, both of Chiba; Ariyoshi Nakaoki,

Tokyo, all of (JP)

(73) Assignee: Sony Corporation, Tokyo (JP)

( * ) Notice: This patent issued on a continued prosecution application filed under 37 CFR 1.53(d), and is subject to the twenty year patent term provisions of 35 U.S.C. 154(a)(2).

Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 0 days.

(21) Appl. No.: 09/086,277

(22) Filed: May 28, 1998

Related U.S. Application Data

(63) Continuation of application No. 08/629,564, filed on Apr. 9, 1996, now Pat. No. 5,766,717.

(30) Foreign Application Priority Data

Apr. 11, 1995 (JP) 7-085369

Apr. 19, 1995 (JP) 7-094068

(51) Int. CI. B32B 31/06

(52) U.S. CI 156/245; 156/275.5; 156/275.7;

428/65.2; 369/286; 369/94; 359/589

(58) Field of Search 156/245, 273.7,

156/275.5, 275.7, 275.3, 291, 295, 60; 369/286, 288, 283, 275.1, 94, 44.12, 44.37;

428/64.4, 65.2; 359/586, 588, 589

(56) References Cited

U.S. PATENT DOCUMENTS 4,450,553 5/1984 Holster et al. .

A multilayer optical disk having an information storage layer which can as well as be reproduced by a general purpose reproducing apparatus, for example, a compact disk player, and from which information can be read from other information storage layers by using an exclusive reproducing apparatus. The method of manufacturing a multilayer disk comprises the steps of forming a first substrate having a first information storage area enabling reproduction of information therein with a first light beam having a wavelength of 770 nm to 830 nm; forming a second substrate having a second information storage area enabling reproduction of information therein with a second light beam having a wavelength of 615-655 nm but which is relatively transparent with respect to said first light beam; and bonding said first substrate to said second substrate together without said first and second said information areas facing each other.

10 Claims, 6 Drawing Sheets