Data recording apparatus adapted for recording data signals onto

Details Data recording apparatus adapted for recording data signals onto Data recording apparatus adapted for recording data signals onto

1996-01-26

1998-04-07

Tran, Thang V.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369116, G11B 700

Patent

active

057372896

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention relates to a data recording apparatus adapted for recording data signals onto an optical recording medium.


BACKGROUND ART

Hitherto, as data recording apparatuses adapted for recording data signals onto an optical recording medium, there are optical disc apparatuses adapted to irradiate laser beams onto a disc-shaped recording medium to successively form pits so that information can be recorded. As the optical disc apparatus of this kind, there is, e.g., a CD-R (CD-Recordable) drive unit in conformity with the standard of the so-called CD (Compact Disc).
The optical disc used in this CD-R drive unit is the so-called write-once type optical disc such that high intensity laser beams are irradiated so that the optical property of the recording layer between pre-grooves serving as a guide groove formed in advance is changed, thus permitting information to be recorded only once.
The recording format of the optical disc used in this CD-R drive unit is shown in FIGS. 1 and 2. At this optical disc, a program area PG for recording speech data, etc. is provided. At the inner circumferential side of the program area PG, a lead-in area LI including TOC (Table of Contents) is provided. At the outer circumferential side of the program area PC, a lead out area LO is provided. Further, at the inner circumferential side of the lead in area LI, a program memory area PMA for recording the recording state of the program area PG and a power control area PCA for controlling (adjusting) the laser drive power are provided. The area from the power control area PCA up to the lead out area LO is called an information area IA.
When the center of the optical disc is assumed to be C, standardization is made such that the diameter R.sub.5 of the optical disc is 120 mm, the diameter R.sub.4 up to the outermost circumference of the lead out area LO is 118 mm, and the diameter R.sub.3 up to the innermost circumference of the lead out area LO is 116 mm. Moreover, standardization is made such that the diameter R.sub.2 up to the innermost circumference of the program area PG is about 50 mm, and the diameter R.sub.1 up to the innermost circumference of the lead in area L.sub.I is about 46 mm. Thus, the distance L.sub.I of the lead in area L.sub.I is about 4 mm. In addition, the diameter R.sub.6 up to the innermost circumference of the power control area PCA is about 44.87 mm.
The start time t.sub.3 of the lead in area LI and the start time t.sub.5 of the lead out area LO of the optical disc shown in FIG. 2 are times obtained from absolute address information signal recorded in advance on the optical disc, which are called ATIP (Absolute Time In Pre-groove). With the start time t.sub.3 of the lead in area LI being as reference, end time t.sub.4 of the lead in area LI, start time t.sub.2 of the program memory area PMA and start time t.sub.1 of the power control area PCA are respectively determined. Moreover, when the start time t.sub.3 of the lead in area LI is assumed as 0 min. 0 sec. 0 frame, and is represented by 00:00:00, the start time t.sub.1 of the power control area PCA and the start time t.sub.2 of the program memory area PMA are respectively represented as (t.sub.3 -00:35:65) and (t.sub.3 -00:13:65) by the time series. It is to be noted that the end time t.sub.4 of the lead in area LI is also defined as a time obtained by subtracting the time corresponding to one sub code frame from the start time of the program area PG, and the end time t.sub.4 of the lead in area LI can be represented by 99:59:74.
Moreover, the power control area PCA consists of a test write area TA and a count area CA as shown in FIG. 3. The test write area TA and the count area CA are areas used for OPC (Optimum Power Control) operation carried out prior to recording of data, i.e., calibration operation of the laser drive power. The test write area TA has a size corresponding to 1500 subcode frames, and the count area CA has a size corresponding to 100 subcode frames. In this case, the subcode frame is a frame of 1/75 seconds in te

REFERENCES:
patent: 4631713 (1986-12-01), Romeas et al.
patent: 5175719 (1992-12-01), Iimura
patent: 5226027 (1993-07-01), Bakx
patent: 5305296 (1994-04-01), Kono
patent: 5563862 (1996-10-01), Udagawa
patent: 5592463 (1997-01-01), Muramatsu et al.

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