Optical Disk Image Drawing Method

a technology of optical disk and image, applied in the field of optical disk image drawing method, can solve problems such as troublesome operation, and achieve the effect of accurate measuremen

Inactive Publication Date: 2010-09-30
YAMAHA CORP
View PDF8 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0016]In the first optical disk image drawing method, the position of the spindle motor in the rotating direction with respect to the reference position can be measured by, for instance, counting the number of pulses of FG pulse generated from the spindle motor. In this case, the rotating speed of the spindle motor is controlled to be constant, and the time difference between the detecting timing of the predetermined position on the track and the generating timing of the FG pulse produced adjacently to the detecting timing is measured to correct the time difference and measure the position of the spindle motor in the rotating direction. Thus, the position of the spindle motor in the rotating direction with respect the predetermined position on the track can be accurately measured.

Problems solved by technology

Thus, an operation is troublesome.

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
  • Optical Disk Image Drawing Method
  • Optical Disk Image Drawing Method
  • Optical Disk Image Drawing Method

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

Embodiment of First to Third Optical Disk Image Drawing Methods

[0092]Now, a first embodiment of the present invention will be described. FIG. 1 shows the structure of a system of an optical disk device to which the present invention is applied. In the optical disk device 10, an optical disk 12 is formed as an optical disk capable of recording and drawing an image in which a data recording layer and an image drawing layer are laminated and formed. The image drawing layer is composed of a thermal sensitive material or a photosensitive material and whose visibility is changed by applying a laser beam thereto. The image drawing layer can be composed of, for instance, the same coloring matter material as that of the data recording layer. On the data recording layer, a wobble groove is formed as a track. The image drawing layer has a layer exclusive for drawing an image and further, alternatively one layer of two layers that are originally prepared as data recording layers like an existin...

modified example 1 of first embodiment

[0129]In the first embodiment, FG counter 24 is temporarily reset at the predetermined reference position 108 (the boundary position of the sector “0” and the sector “1”), and then, the FG pulses generated after that are counted by the FG counter 24. Every time the count value reaches a value corresponding to one turn, the count value is returned to “0” to measure the position of rotating angle from the reference angle line 110 every turn. However, in this method, when the resolution of the FG pulse is low (when the number of FG pulses is small for one turn), there is a possibility that a deviation angle (an offset angle) is large between the reference angle line 110 of the data recording layer A and a position where the FG pulse is generated. Then, in the first embodiment, at the time of drawing the image, since the generating position of the FG pulse is considered to be the position of the reference angle line 110 to draw the image, the offset angle appears as a deviation of the o...

modified example 2 of first embodiment

[0137]In the modified example 1, the count of the FG pulse and the count of the reference clock are used together to improve the detecting resolution of the reference angle line. However, a frequency multiplied pulse of the FG pulse may be used in place of the count of the reference clock. In this case, as shown by a dotted line in FIG. 1, a multiplier 113 frequency multiplies the FG pulse outputted from the spindle motor 14 by a predetermined multiple and a multiplied-FG-pulse counter 115 counts the frequency-multiplied FG pulse The multiplied-FG-pulse counter 115 is used in the same manner as that of the C counter in the modified example 1 (see FIGS. 16 to 19). Namely, in the detecting process of the reference angle line 110 in FIG. 16, the count value of the multiplied-FG-pulse counter 115 is counted up according to the multiplied FG pulse and reset to “0” every time the leading edge of the FG pulse is detected (see the operation of the C counter in FIG. 17(c)). When the referenc...

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 optical disk image drawing method includes: rotating the optical disk by a spindle motor; reading a predetermined information recorded on a track of a data recording layer; detecting a predetermined position on the track based on the read predetermined information; measuring a position of the spindle motor in a rotating direction using the detected predetermined position as a reference position; changing a focus position of the laser beam to the image drawing layer; starting forming the visible image on the image drawing layer from a predetermined position of the spindle motor in the rotating direction relative to the reference position based on the measured position of the spindle motor in the rotating direction; and sequentially moving an optical pick-up in the radial direction synchronously with the rotation of the spindle motor to proceed to form the visible image.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a divisional of U.S. patent application Ser. No. 11 / 768,292, filed Jun. 26, 2007, which claims priority under 35 U.S.C. §119 to Japanese Patent Application No. 2006-175860, filed Jun. 26, 2006, the entire disclosures of which are herein expressly incorporated by reference.BACKGROUND OF THE INVENTION[0002]The present invention relates to an optical disk image drawing method for forming a visible image (drawing an image) such as a picture, a character or the like on the surface of an optical disk and more particularly to an optical disk image drawing method for controlling an image drawing position by a laser beam outputted from one laser diode to draw an image by the laser beam.[0003]JP-A-2002-203321 and JP-A-2005-346886 disclose a technique that an image drawing layer composed of a thermal sensitive layer or a photosensitive layer is formed on a surface of an optical disk such as a CD capable of recording or a DVD capa...

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 & AuthorityApplications(United States)
IPC IPC(8): B41J2/435
CPCG11B23/40G11B7/24038
InventorITOGA, HISANORIFUSHIKI, TATSUOYAMADA, SEIYA
OwnerYAMAHA CORP