Information recording apparatus

• US 6,404,716 B1
• Filed: 11/16/2000
• Issued: 06/11/2002
• Est. Priority Date: 12/26/1996
• Status: Expired due to Term

• Current Assignee: Hitachi Consumer Electronics Company Limited (Hitachi, Ltd.)
• Original Assignee: Hitachi, Ltd., Hitachi Maxell Limited (Maxell, Ltd.)
• Inventors: Saga, Hideki, Sukeda, Hirofumi, Yorozu, Takehiko
• Primary Examiner(s): EDUN, MUHAMMAD N
• Application Number:
  US09/712,985
• Time in Patent Office: 572 Days
• Field of Search: 369/47.1, 369/47.15, 369/47.2, 369/47.24, 369/53.1, 369/53.11, 369/53.2, 369/53.26, 369/59.1, 369/59.13, 369/116, 369/124.01, 369/59.11
• US Class Current: 369/59.11
• CPC Class Codes: G11B 11/1053 to compensate for the magnetic domain drift or time shift
• CPC Class Codes: G11B 11/10595 Control of operating function
• CPC Class Codes: G11B 7/0045 Recording G11B7/006, G11B7/0065 take precedence
• CPC Class Codes: G11B 7/00454 involving phase-change effects
• CPC Class Codes: G11B 7/00456 Recording strategies, e.g. pulse sequences G11B7/0062 takes precedence
• CPC Class Codes: G11B 7/00557 involving phase-change media
• CPC Class Codes: G11B 7/006 Overwriting G11B7/0065 takes precedence
• CPC Class Codes: G11B 7/126 Circuits, methods or arrangements for laser control or stabilisation

Abstract

An information recording apparatus capable of forming a fine mark reliably and highly precisely through compensation for thermal interference and heat accumulation. The information recording apparatus is provided with a recording energy irradiating unit for generating at least two recording waveforms when marks of the same length or spaces of the same length in a channel data sequence are recorded. The information recording apparatus constructed as above can realize highly reliable recording/reproducing operations and can be made compact at a low cost with a large storage capacity.

Claims

1. An information recording apparatus for recording data by applying energy to a recording medium to form thereon local physical changes of the medium, the information recording apparatus comprising:

recording energy irradiating means for generating at least two recording waveforms when spaces of the same length in a channel data sequence are recorded.

3. An information recording apparatus according to any one of claims 1 and 2, wherein the upper envelope of the recording waveform during a mark forming period lowers as a time lapses from the start of the mark forming period.

4. An information recording apparatus according to any one of claims 1 and 2, wherein the lower envelope of the recording waveform during a mark forming period lowers as a time lapses from the start of the mark forming period.

5. An information recording apparatus according to any one of claims 1 and 2, wherein the recording waveform includes a mark forming period with at least two energy levels and a mark non-forming period with at least two energy levels.

6. An information recording apparatus according to any one of claims 1 and 2, further comprising reference timing generating means for generating a reference time to control the recording waveform, wherein a holding time of each recording energy level is approximately an integer multiple of the reference time or approximately a half-odd integer multiple of the reference time.

2. An information recording apparatus for recording data by applying energy to a recording medium to form thereon local physical changes of the medium, the information recording apparatus comprising:

recording pattern analyzing means for analyzing a recording pattern in a channel data sequence when data is recorded; and

recording energy irradiating means for generating at least two recording waveforms when spaces of the same length in the channel data sequence are recorded, in accordance with the analyzed results by said recording pattern analyzing means.