Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
DISK, METHOD AND APPARATUS FOR ITS DISCRIMINATION AS WELL AS APPARATUS FOR ITS REPRODUCTION
Document Type and Number:
Japanese Patent JPH1153822
Kind Code:
A
Abstract:

To satisfactorily discriminate an unlawful copying operation, to realize a strong security and to simply discriminate a disk visually.

Security information is recorded on a buffer region which is situated on the inner circumferential side of a lead-in region 12. A wide mirror- face region 20 is formed between a security region 22 and the lead-in region 12. A sector member inside the security region 22 is different from a one-digit sector member inside the lead-in region 12, and it is set to be, e.g. 100 or higher. As a result, both can be discriminated clearly. The beam spot of a pickup is moved up to the buffer region, and the security information is read out. A read-out signal at this time is decoded, it is compared with a content which is stored on a memory in advance, and disks are discriminated.


Inventors:
UIRIAMU SHII MARISON
AREN AARU OORURIIDO
Application Number:
JP1997000224403
Publication Date:
June 16, 1989
Filing Date:
August 06, 1997
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
AEROQUIP AG
International Classes:
F16D3/80; F16L37/22; F16L37/23; F16L37/40; F16L37/413; (IPC1-7): F16D3/80
Domestic Patent References:
JPS5618834A1981-02-23
Foreign References:
GB785282A1957-10-23
Attorney, Agent or Firm:
梶原 康稔



 
Previous Patent: JPH01153821

Next Patent: TORQUE LIMITER