Dual-Layer Recording Buffer Area Extension via Calibration Zone Merging
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Solution Overview
Problem
In dual-layer recording media, the middle area cannot be easily extended to prevent optical pickup runaway due to the presence of the ODTA on the outer circumferential side, limiting the size of buffer and calibration areas, which affects the stability of recording and reproduction operations.
Innovation Solution
A recording apparatus and method that includes a buffer area and a calibration area on each recording layer, with a reserved area set in the calibration area to extend or generate the buffer area, allowing the calibration area to function as a buffer area, ensuring stability by preventing data interference and enabling reading of control information like sector ID.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the middle area is extended to prevent optical pickup runaway, then the buffer area size increases, but the calibration area (ODTA) located on the outer circumferential side limits the extension space
Solution Approach 1:
The patent merges the buffer area and calibration area by allowing the calibration area (ODTA) to serve dual purposes: as a calibration region and as an extended buffer area. The setting device designates a reserved area within the calibration area that functions as buffer, combining the protective function of buffer areas with the calibration function of ODTA.
Solution Approach 2:
The calibration area (ODTA) is given multiple functions: it serves both as a region for calibrating laser power and as an extended buffer area for preventing optical pickup runaway. This multi-functional use resolves the space conflict by making the calibration area serve both its original purpose and the buffer function simultaneously.
2Measurement precision
If the calibration area is used for power calibration, then laser power calibration accuracy improves, but the area cannot be used for extending the buffer area
Solution Approach 1:
The patent combines the calibration function and buffer function within the same physical area (ODTA). The setting device designates a reserved area within the calibration area that serves as buffer, allowing both functions to coexist in the same spatial region without compromising calibration accuracy.
Solution Approach 2:
The calibration area is segmented into different functional zones: a reserved area that serves as buffer and other portions that serve for calibration. This segmentation allows simultaneous fulfillment of both buffer and calibration functions within the overall calibration area.
3Quantity of substance
If record information is recorded into the calibration area, then data storage capacity increases, but control information reading becomes difficult due to data interference
Solution Approach 1:
The patent extracts a reserved area from the calibration area where no record information is written. This reserved area remains free of data interference, allowing control information to be read without interference from recorded data, while other portions of the calibration area can be used for data storage.
Solution Approach 2:
The reserved area is predetermined and protected from data recording before any data is written to the calibration area. This preliminary designation ensures that control information reading paths remain clear of data interference while maximizing data storage in other areas.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for the generation of a buffer area of sufficient size, ensuring the stability of recording and reproduction operations, particularly in dual-layer media with errors in layer bonding or eccentric errors, and enables reading of control information even after data recording, preventing optical pickup runaway.
Implementation Method 1
a recording device for recording record information onto at least one of (i) a recording medium provided with: a first recording layer and a second recording layer in which the record information is recorded by irradiating laser light thereon
Implementation Method 2
it is necessary to calibrate the power of laser light, which is irradiated to record the data
Data Source
AI summary
A recording apparatus includes: a recording device for recording record information onto at least one of (i) a recording medium including: a first recording layer and a second recording layer in which the record information is recorded by irradiating laser light thereon, each of the first and second recording layers including a buffer area and a calibration area, and (ii) a recording medium including: the first recording layer and the second recording layer, each of the first and second recording layers including the calibration area; a setting device for setting a reserved area having a predetermined size for extending or generating the buffer area, by each recording unit in the calibration area; a calibrating device for calibrating the power by using the calibration area other than the set reserved area; and a controlling device for controlling the recording device to record the record information into at least the reserved area.