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(12) PATENT APPLICATION PUBLICATION
(19) INDIA (21) APPLICATION No:
1376/MAS/1997A
(22) Date of filing of Application:23/06/1997 (43) Publication Date: 09/06/2006
(54) Title of the invention:
OPTICAL DISC.
(51)International classification:W 1 B 7/24
(31) Priority Document No.8-166219
(32) Priority Date:26/06/1996
(33) Name of priority country:JAPAN .
(87) WIPO No. :
(61) Patent of addition to
Application No. :
Filed on:
(62) Divisional to
Applcation No.:
Filed on:
(71) Name of Applicant
MITSUBISHI DENKI KABUSHIKI
KAISHA & MATSUSHITA ELECTRIC
INDUSTRIAL CO,
Address of Applicant:
2-3,MARUNOUCHI 2-
CHOME,CHIYODA-KU,TOKYO 100,
&
1006, OAZA KADOMA, KADOMA-SHI,
OSAKA 571,
JAPAN.
(72) Name of the Inventor(s):
KAZUHIKO NAKANE. SHUNJI
OHARA.
HIROYUKI OHATA. TAKASHI
ISHIDA.
MASATO NAGASAWA. YOSHINARI
TAKEMURA.
KENJI GOTOH.
YOSHINOBU ISHIDA.
ISAO SATOH.
(57)Abstract
An optical disc using a single-spiral land and groove track format and an address signal enabling simple sector
address management and format compatibility with read-only optical disc media is disclosed. Four physical address
areas PIDl -PID4 are recorded to a header area such that PIDl and PID2 are offset one-half track pitch toward the
outside circumference of the disc from the groove track center, and PID3 and PID4 are offset one-half track pitch
toward the inside circumference of the disc from the groove track center, and the header area is shared by groove
track sectors and land track sectors. A groove track sector address is written to PID3 and PID4, and the sector address
of the land track sector adjacent on the outside circumference side of that groove sector is written to PIDl and PID2.
The address of each sector increases 1 in the same sequence as the sectors are formed in the recording spiral.
The Patent Office Journal 09/06/2006 10809