# US 9,183,871 B2 · Optical recording device, optical recording method and multi-layer disk

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- Number: US 9,183,871 B2
- Document ID: US9183871B2
- Status: Granted
- Kind: B2
- Application number: 14/400,199
- Filed: 2013-03-27
- Published: 2015-05-14
- Granted: 2015-11-10
- Earliest claimed: 2012-05-11
- Assignees: Taiyo Yuden Co., Ltd.
- Applicants: Taiyo Yuden Co., Ltd.
- Inventors: Kenichi Shimomai; Yutaka Imamura
- Web page: https://patentgrep.com/patent/US9183871B2

## CPC

- G11B 7/00736: {Auxiliary data, e.g. lead-in, lead-out, Power Calibration Area [PCA], Burst Cutting Area [BCA], control information (sector headers or adresses in prepits G11B7/00745; address data in track wobble G11B7/24082)}
- G11B 7/1267: Power calibration
- G11B 7/24038: Multiple laminated recording layers
- G11B 7/2405: being also used as track layers of pre-formatted layers (tracks or pits G11B7/2407)
- G11B 2020/10861: {Finalising a record carrier after a recording operation, e.g. to ensure compatibility with a ROM medium}
- G11B 2020/1275: {Calibration data, e.g. specific training patterns for adjusting equalizer settings or other recording or playback parameters}
- G11B 2020/1288: {Formatting by padding empty spaces with dummy data, e.g. writing zeroes or random data when de-icing optical discs}
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)

## Abstract

An optical recording device that records to a multi-layer disk having multiple recording layers includes a controller which sets a data area in which user data is recorded, and a calibration area including a main calibration area and at least one sub-calibration area which are used to calibrate the intensity of laser light for recording, with the same layout among the plurality of recording layers, conducts first calibration for performing initial recording in the data area by using the main calibration area, records dummy data in the remainder of the main calibration area, and conducts second calibration for performing additional recording in the data area by using the sub-calibration area.

## Claims

### Claim 1

An optical recording device that records to a multi-layer disk having multiple recording layers, said optical recording device comprising:
an optical pickup that selectively irradiates laser light to the recording layers via an objective lens; and
a control part that performs controls in such a way as to:
set in each of the multiple recording layers a data area where user data is recorded and a calibration area used for an intensity calibration process of the laser light for recording, including a main calibration area and at least one sub calibration area, according to a same layout that applies to all of the multiple recording layers;
use the main calibration area to perform a first calibration process for implementing initial recording to the data area in each of the multiple recording layers one by one from a recording layer farthest away from or closest to an objective lens of an optical pickup;
record dummy data to a remainder of the main calibration area; and
use the at least one sub calibration area to perform a second calibration process for additional recording to the data area,
wherein the control part performs controls in such a way that, when the recording layer to which data will be recorded next is referred to as a target recording layer and the recording layer to which data was recorded immediately before the target recording layer is referred to as an adjacent recording layer, and when second user data of a larger size than first user data already recorded to the data area of the adjacent recording layer will be recorded to a data area of the target recording layer, then the second user data is divided into a first block corresponding to a size of the first user data and a second block for other data, and the calibration process for the first block is performed as the first calibration process using the main calibration area, while the calibration process for the second block is performed as the second calibration process using the sub calibration area.

### Claim 2 (depends on 1)

An optical recording device according to claim 1, wherein the control part performs controls in such a way that, after a closing process to prohibit additional recording of the user data to the data area of the target recording layer, dummy data is recorded to a remainder of the main calibration area.