USO0RE41415E
(19) United States (12) Reissued Patent
(10) Patent Number:
Nakamura et al.
(45) Date of Reissued Patent:
(54)
OPTICAL DISC INCLUDINGA PLURALITY OF DATA LAYERS
(75)
Inventors: Atsushi Nakamura, Osaka (JP); Mamoru Shoji, Osaka (JP); Takashi Ishida, Kyoto (JP)
(73)
(21) (22)
Assignee: Panasonic Corporation, Osaka (JP)
Appl. No.: 12/393,588 '
.
Flled.
Relssue of:
Feb. 26, 2009
Patent NO.Z
Division of application No. 10/018,363, ?led as application NO. PCT/JP00/04026 on Jun. 21, 2000, now Pat. NO. 6,990, 055.
(30)
Foreign Application Priority Data
Jun. 22, 1999
(JP)
4/2002 Tada et al. 9/2002 Nagata et a1.
6,771,587 B2
8/2004 Nishiuchi et al.
Jul. 6, 2010
FOREIGN PATENT DOCUMENTS CN
1206183
1/1999
EP
0 724 256
7/1996
EP
0 807 926
11/1997
GB JP
2 327 525 63-263644
1/1999 10/1988
JP
9428763
5/1997
JP
9-128804
9620084
5/1997
12/1997
JP
10269575
10/1998
JP
Apr. 10, 2007 11/187,868 Jul. 25, 2005
U.S. Applications: (62)
6,370,093 B1 6,456,584 B1
JP
Related US. Patent Documents
Issued: Appl. No.: Filed:
US RE41,415 E
11_3550
1/1999
JP JP WC
11-25467 ll-39657 96-28818
l/l999 2/1999 9/1996
WO
98/05032
2/1998
Primary ExamineriPaul Huber (74) Attorney, Agent, or Firmiwenderoth, Lind & Ponack, L.L.P.
(57)
ABSTRACT
When recording or reading an optical disc having plural data
......................................... .. ll-l74986
Sep. 7, 1999
(JP)
11-252394
Dec. 16, 1999
(JP)
......................................... .. 11-357227
recording layers, Which data recording layer the light spot is focused on is detected to improve playback signal quality and signals Written to the layer on Which the light spot is
(2006.01)
focused are read more reliably. A convergent lens converges the laser beam on the optical disc, and a focus controller
(52)
US. Cl. ...................... .. 369/283; 369/94; 369/2753
tracking controller positions and tracks the focal point of the
(58)
Field of Classi?cation Search ...................... .. None
(51)
Int. Cl. G11B 3/70
controls the focal point of the laser beam on the data layer. A
See application ?le for complete search history. (56)
References Cited U.S. PATENT DOCUMENTS 5,072,435 5,696,743 6,208,736 6,221,454
A A B1 B1
12/1991 12/ 1997 3/2001 4/2001
Bakx Kawasaki Gotoh et al. Saito et al.
laser beam converged by the convergent lens on a track of
the optical disc. A photodetector detects the re?ected laser beam from the disc. A convergence detector then detects the convergence state of the laser beam emitted to the plural data
recording layers. Based on output from the convergence detector, the laser driver is controlled to separately set beam poWer appropriately for each of the plural data layers of the
disc during playback. 5 Claims, 36 Drawing Sheets
3504 RECORDING-PROHIBITED AREA 3503 FIRST LAYER LEARNING AREA
'3501 FIRST LAYER
SUBSTRATE 3502 FIRST LAYER USER DATA neconome AREA
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