Unlock instant, AI-driven research and patent intelligence for your innovation.

Device and method for determining short pulse series writing areas on rewritable DVD

An evaluation device and pulse number technology, applied in the field of BCA evaluation device, can solve the problems of inevitable missed measurement or reading error, inability to ensure sufficient reliability of evaluation results, and long time.

Inactive Publication Date: 2007-10-24
PANASONIC CORP
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, for a rewritable DVD of 1, the maximum number of barcode lines to be checked is about 4000, and the average number is about 2000. Therefore, in order to evaluate whether they all meet the specified specifications, if the BCA signal is observed visually , it is inevitable that there will be omissions or misreadings, and the full reliability of the evaluation results cannot be ensured
In addition, it takes a long time for evaluation, and there is a problem of labor-intensive

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Device and method for determining short pulse series writing areas on rewritable DVD
  • Device and method for determining short pulse series writing areas on rewritable DVD
  • Device and method for determining short pulse series writing areas on rewritable DVD

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] Next, a BCA evaluation device according to an embodiment of the present invention will be described with reference to the drawings.

[0025] [1] Overall composition

[0026] FIG. 2 is a block diagram showing the configuration of a BCA evaluation device for rewritable DVD (hereinafter referred to as "evaluation device") according to an embodiment of the present invention. The evaluation device 2 is also drawn. The DVD 201 is held by a rotating shaft 202 having a clamping function, and the rotating shaft 202 is rotationally driven by a motor 203 . Furthermore, an encoder 204 is attached to the motor 203 . The encoder 204 generates a pulse every time the rotary shaft 202 rotates once, that is, every time the DVD 202 rotates once.

[0027] The signal acquisition unit 205 reads the information recorded on the DVD 201 and converts it into an electrical signal, and outputs it to the filter unit 206 . The filter unit 206 filters the output signal from the signal acquisition...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

An RF signal is read from a rewritable DVD while rotating the rewritable DVD. The read RF signal is converted to pulse signals, and the number of pulses of each pulse signal is counted. Indexes IBSmin, IBMmax, IBS, and IBRmax are determined from the relationship between the counted numbers and the threshold values, and the recording quality of the BCA is evaluated by judging whether these indexes satisfy the following inequalities: IBMmax / IBSmin<=0.8 IBRmax / IBS<=1.5.

Description

technical field [0001] The present invention relates to a BCA evaluation device and a BCA evaluation method for evaluating the recording quality of a BCA (burst recording area) recorded on a rewritable DVD. Background technique [0002] In recent years, rewritable DVDs, such as DVD-RAM, DVD-R, DVD-RW, and DVD+RW, which can be written or rewritten, have been widely used as recording media. The BCA of a rewritable DVD is a ring-shaped area located in the center of the disc, and on the BCA, additional information such as a serial number of each disc is recorded as a barcode by laser processing. [0003] In the past, the recording quality of BCA was evaluated by displaying the signal waveform of all RF signals including the BCA signal corresponding to the barcode using an oscilloscope, and visually judging whether the absolute value of the signal satisfies the specification. FIG. 1 is a diagram showing the configuration of a measuring instrument used for such a visual judgment,...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G11B27/00G11B7/00G11B7/005G11B7/0037G11B20/10G11B20/18G11B27/19G11B27/24G11B27/36
CPCG11B7/00375G11B20/10009G11B27/24G11B2220/218G11B7/0053G11B2220/216G11B27/36G11B7/00736G11B2220/2575G11B2220/2562
Inventor 椎崎哲也久保田三郎木田胜启
Owner PANASONIC CORP