Title:
OPTICAL DISK MASTER DISK EXPOSURE DEVICE
Document Type and Number:
Japanese Patent JP3032500
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an optical disk master disk exposure device precisely synchronizing a wobble signal with a land pre-pit signal by a formatter and outputting them and to simplify a separation element electrically separating an analog circuit from a digital circuit by the formatter and its peripheral circuit design.
SOLUTION: A formatter 16 of this optical disk master disk exposure device is provided with a wobble signal generation circuit 21 operated based on a prescribed fundamental clock signal Fclk and generating the wobble signal and a land pre-pit signal generation circuit 22 operated based on the same fundamental clock signal Fclk and generating the land pre-pit signal. The wobble signal generation circuit 21 is provided with a frequency divider circuit 62 frequency-dividing the fundamental clock signal Fclk to be operated by the frequency division signal of the fundamental clock signal Fclk.
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Inventors:
Hisao Watanabe
Application Number:
JP7373298A
Publication Date:
April 17, 2000
Filing Date:
March 23, 1998
Export Citation:
Assignee:
株式会社リコー
International Classes:
G11B7/007; G11B7/26; (IPC1-7): G11B7/007; G11B7/26
Domestic Patent References:
| JP11120622A | ||||
| JP10255330A | ||||
| JP7210873A | ||||
| JP8214033A | ||||
| JP3203027A | ||||
| JP25149U |
Attorney, Agent or Firm:
Akira Kashiwagi (1 person outside)