CN1297958C - Method for detecting unbalanced discs - Google Patents
Method for detecting unbalanced discs Download PDFInfo
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- CN1297958C CN1297958C CNB2004100283863A CN200410028386A CN1297958C CN 1297958 C CN1297958 C CN 1297958C CN B2004100283863 A CNB2004100283863 A CN B2004100283863A CN 200410028386 A CN200410028386 A CN 200410028386A CN 1297958 C CN1297958 C CN 1297958C
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Abstract
The present invention relates to a method for detecting unbalanced discs, which is applied between a disc reading device and a disc to be read. The method comprises the following steps: a startup program is carried out for the disc to be read by the disc reading device at a first preset rotary speed, wherein the startup program comprises the step of detecting the type of the disc to be read; the disc reading device ends the startup program and presents a reading preparation completing state; in the reading preparation completing state, the first step of detecting the vibration of the disc is carried out by the disc reading device at a second preset rotary speed to judge whether the disc to be read is unbalanced, wherein the second preset rotary speed is higher than the first preset rotary speed.
Description
Technical field
This case relates to a kind of non equilibrium disk detection method, particularly is applied to the non equilibrium disk detection method between a disk reading device and a disc to be read.
Background technology
See also Fig. 1, it is that an optical read head 10 is arranged on the direction of motion synoptic diagram in the optical pickup device of CD-ROM drive for example, it mainly moves along two kinds of directions, first kind of direction is to be focus direction (the focusing direction perpendicular to the discs surface, be called for short F), and second kind of direction is the tracking direction (tracking direction is called for short T) for being parallel to the discs surface.
And because discs all might allow discs have problems in making the process of producing or preserving collection, and in the problem disc, a kind of non equilibrium disk (unbalance disk) that is called as is arranged, it mainly is because the weight distribution inequality or the flatness of this disc are not good, when causing disc to run up, will produce serious up-down vibration phenomenon along focus direction, cause optical read head 10 effectively to finish to focus on and can't carry out data read perpendicular to the discs surface.
In order to improve above-mentioned disappearance, additionally carry out a non equilibrium disk testing mechanism in the start-up routine (start-up) that known CD-ROM drive is just carried out after the user inserts disc, use and detect whether the disc that the user inserts is a non equilibrium disk, and when this non equilibrium disk testing mechanism is judged the disc of being inserted and is a non equilibrium disk, just will enter one reads when being ready to complete (ready) state in the program of finishing start-up routine (start-up), force CD-ROM drive to comply with the vibrative big or small degree of this non equilibrium disk, and corresponding execution is set in a predetermined slow-speed of revolution, in order to avoid because the vibration that when running up, produced of non equilibrium disk, cause optical read head 10 effectively to finish focusing on and can't carry out data read.For example, the vibratory output of general disc is divided into three kinds of grades, the first estate is regarded as normal disc and corresponds to maximum speed (for example 24 times of speed), and second grade and the tertiary gradient then are regarded as non equilibrium disk and correspond to one respectively than the slow-speed of revolution (for example 15 times of speed) and minimum speed (for example 10 times of speed).
But, the start-up routine of known CD-ROM drive (start-up) mainly is that (with the slim DVD drive of device on mobile computer is example with its minimum speed setting, the high power speed of speed setting is 8 times of speed, and low power speed is 4 times of speed, if with the slim CD drive of device on mobile computer is example, the high power speed of speed setting is 24 times of speed, and low power speed is 10 times of speed) carry out the kind class method that (i) differentiates disc, be called for short and declare sheet, contents table (Table of Contents the is called for short TOC) supervisor on the disc is proofreaied and correct and (iii) read to the DC level that (ii) reads signal.And if will in start-up routine, desire to carry out above-mentioned non equilibrium disk testing mechanism the time, CD-ROM drive must be spent one extra period, and (about 2 to 3 seconds) upwards are promoted to a high-speed state with its rotating speed by minimum speed setting and (for example are promoted to about 20 times of speed by 10 times of speed, but and can't confirm its high-speed state real-turn speed really), can effectively utilize the vibration of its focus direction to measure whether the disc of being inserted is a non equilibrium disk.And known CD-ROM drive must be used up the time in about 2 to 3 seconds when upwards being promoted to a high-speed state by minimum speed setting usually, therefore known non equilibrium disk testing mechanism will make the spent time of start-up routine (start-up) of known CD-ROM drive, by originally about 8 to 10 seconds time, the start-up routine time more than the elongation to 10 second, cause user's inconvenience and puzzlement in the use.Therefore, how improving the disappearance of above-mentioned technology, is the fundamental purpose for development this case.
Summary of the invention
This case is to be a kind of non equilibrium disk detection method, be applied between a disk reading device and the disc to be read, this method comprises the following step: this disk reading device carries out a start-up routine with one first desired speed to this disc to be read, and this start-up routine includes the step of the kind of differentiating this disc to be read; This disk reading device finishes to enter one behind this start-up routine and reads the state of being ready to complete; And read in the state of being ready to complete at this, this disk reading device is carried out one first disc vibration detection step at one second desired speed, whether use and judge this disc to be read is a non equilibrium disk, and this second desired speed is greater than this first desired speed, and this first disc vibration detection step comprises the following step: enter one and follow the tracks of closed condition; And the intensity of variation that detects a tracking error signal, whether use and judge this disc to be read is a non equilibrium disk.
According to above-mentioned conception, the described non equilibrium disk detection method of this case, wherein, this first desired speed is the minimum speed for this disk reading device.
According to above-mentioned conception, the described non equilibrium disk detection method of this case, wherein, this start-up routine more includes the action of reading the contents table on this disc to be read.
According to above-mentioned conception, the described non equilibrium disk detection method of this case, wherein, the intensity of variation that detects this tracking error signal be for detect this disc to be read revolve turn around after, this tracking error signal sweeps the vibratory output that the area stool and urine of being contained can be represented this disc, and sweep institute when containing area when this tracking error signal greater than a first threshold, assert that just this disc to be read is a non equilibrium disk.
According to above-mentioned conception, the described non equilibrium disk detection method of this case wherein, more is included in one the 3rd desired speed and carries out one second disc vibration detection step, and the 3rd desired speed is not equal to this second desired speed and this first desired speed.
According to above-mentioned conception, the described non equilibrium disk detection method of this case, wherein, this second disc vibration detection step is to comprise the following step: enter one and follow the tracks of closed condition; And the intensity of variation that detects a tracking error signal, whether use and judge this disc to be read is a non equilibrium disk.
According to above-mentioned conception, the described non equilibrium disk detection method of this case, wherein, the intensity of variation that detects this tracking error signal be detect this disc to be read revolve turn around after, this tracking error signal sweeps the vibratory output that the area stool and urine of being contained can be represented this disc, and sweep institute when containing area when this tracking error signal greater than one second threshold value, assert that just this disc to be read is a non equilibrium disk.
According to above-mentioned conception, the described non equilibrium disk detection method of this case, its applied this disk reading device is to be a DVD drive and a DVD discs with this disc to be read.
According to above-mentioned conception, the described non equilibrium disk detection method of this case, its applied this disk reading device is to be a CD drive and a CD discs with this disc to be read.
The accompanying drawing summary
This case must be by following accompanying drawing and detailed description, in order to do a more deep understanding:
Fig. 1, it is that an optical read head is arranged on the direction of motion synoptic diagram in the optical pickup device of CD-ROM drive for example.
Fig. 2, it is after a disc to be read is inserted a disk reading device, the time dependent synoptic diagram of the rotating speed of this disk reading device.
Fig. 3, it is the schematic flow sheet of this case preferred embodiment method.
The reference numeral explanation:
Optical read head 10
Embodiment
See also Fig. 2, it is after a disc to be read is inserted a disk reading device, the time dependent synoptic diagram of the rotating speed of this disk reading device.Present embodiment is to be that example describes with the slim CD drive of device on mobile computer, certainly also this technological means can be migrated auto levelizer on various disc read-write equipments such as the slim DVD drive on the mobile computer, CD-RW CD-ROM drive, DVD-RW CD-ROM drive, but not repeat them here.
Find out by knowing among the figure, when disc to be read insert this disk reading device at the beginning the time, this disk reading device is to be in a start-up routine (start-up), and this start-up routine (start-up) is the fixing kind class method of carrying out (i) differentiation disc with minimum speed setting (this example is 10 times of speed), be called for short the DC level declare sheet, (ii) to read signal and proofread and correct and (iii) read contents table (Tableof Contents is called for short TOC) supervisor on the disc.It is in do not carry out any rising rotating speed in start-up routine (start-up) with any means known different finishes this start-up routine (start-up) and enters reading of next stage and be ready to complete (ready) state to carry out the action of disc vibration detection step, to use reaching in the mode of shortest time (general about 8 to 10 seconds).
And enter read be ready to complete (ready) state after, CD-ROM drive has just entered the normal data reading state, this moment, CD-ROM drive just can begin upwards to carry out the action that rotating speed improves by minimum speed setting (this example is 10 times of speed), actions such as to the last can at full throttle jumping onto the tracks and data read/write.And be can be under the situation that does not increase the start-up routine time, this case is disc vibration detection step to be changed to enter the normal data reading state and carry out, and in the stage of each raising speed, carries secretly and carries out a disc vibration detection step.With present embodiment, when the CD-ROM drive that enters the normal data reading state promotes rotating speed to one second desired speed (this example is 15 times of speed), the technological means of this case is to utilize the time of about 300 milliseconds (ms) to carry out one first disc vibration detection step, whether use and judge this disc to be read is a non equilibrium disk, and this first disc vibration detection step is to comprise the following step: enter one and follow the tracks of closed condition (tracking off), optical read head will can not produce displacement with the vibration of disc this moment, read action but be fixed on the position, so tracking error signal (Tracking Error is called for short TE) will change.So, detect the intensity of variation of this tracking error signal (TE), whether can judge this disc to be read is a non equilibrium disk.For example, detect this disc to be read according to this desired speed revolve turn around after, this tracking error signal sweeps the vibratory output that the area stool and urine of being contained can be represented this disc, and sweep institute when containing area when this tracking error signal greater than a first threshold, just assert that this disc to be read is a non equilibrium disk (or the zero cross point quantity that this tracking error signal produced, when this zero cross point quantity during, assert that just this disc to be read is a non equilibrium disk) greater than a first threshold.At this moment, the CD-ROM drive that enters the normal data reading state once again will be fixed on minimum speed setting (this example is 10 times of speed) to rotating speed and carry out data read, and can not carry out the action that any rotating speed changes, to guarantee effectively to read the data in this non equilibrium disk.
In addition, when disc to be measured is not judged as a non equilibrium disk by this first disc vibration detection step, present embodiment is just when the CD-ROM drive that enters the normal data reading state promotes rotating speed to the 3rd desired speed (this example is 20 times of speed), utilize the time of about 300 milliseconds (ms) to carry out one second disc vibration detection step again, whether use and judge this disc to be read is a non equilibrium disk, and this second disc vibration detection step comprises the following step equally: enter one and follow the tracks of closed condition (tracking off), optical read head will can not produce displacement with the vibration of disc this moment, read action but be fixed on the position, so tracking error signal (Tracking Error is called for short TE) will change.So, detect the intensity of variation of this tracking error signal (TE), whether can judge this disc to be read is a non equilibrium disk.For example, detect this disc to be read according to this desired speed revolve turn around after, this tracking error signal sweeps the vibratory output that the area stool and urine of being contained can be represented this disc, and sweep institute when containing area when this tracking error signal greater than one second threshold value, just assert that this disc to be read is a non equilibrium disk (or the zero cross point quantity that this tracking error signal produced, when this zero cross point quantity during, assert that just this disc to be read is a non equilibrium disk) greater than a first threshold.Then, the CD-ROM drive that enters the normal data reading state once again will be fixed on suitable speed setting (can be 10 times of speed or 15 times of speed) to rotating speed and carry out data read, and can be carrying out the action that any rotating speed changes, to guarantee effectively to read the data in this non equilibrium disk.And that the schematic flow sheet of said method sees also is shown in Figure 3.
In sum, this case is the disc vibration detection step that known CD-ROM drive is carried out in start-up routine (start-up), change into to read to be ready to complete in (ready) state and carry out in passing, not only can detect under the rotating speed accurately, more can save the time in about 2 to 3 seconds; In addition, this method more can extend to the desired speed more than three, and carries out the vibration detection step more than two, to detect the unbalanced degree of discs more accurately, to cooperate suitable reading speed and servocontrol pattern.
Therefore, this case can improve the disappearance of above-mentioned known technology really, and then reaches the fundamental purpose of development this case.Right this case is invented to such an extent that thought and be to modify as all by the personage Ren Shi craftsman who has the knack of this skill, but neither taking off as Protector that attached claim is desired.
Claims (9)
1. a non equilibrium disk detection method is applied between a disk reading device and the disc to be read, and this method comprises the following step:
This disk reading device carries out a start-up routine with one first desired speed to this disc to be read, and this start-up routine includes the step of the kind of differentiating this disc to be read;
This disk reading device finishes to enter one behind this start-up routine and reads the state of being ready to complete; And
Read in the state of being ready to complete at this, this disk reading device is carried out one first disc vibration detection step at one second desired speed, and whether use and judge this disc to be read is a non equilibrium disk, and this second desired speed is greater than this first desired speed,
This first disc vibration detection step comprises the following step:
Enter one and follow the tracks of closed condition; And
Whether detect the intensity of variation of a tracking error signal, using and judging this disc to be read is a non equilibrium disk.
2. non equilibrium disk detection method as claimed in claim 1, wherein, this first desired speed is the minimum speed of this disk reading device.
3. non equilibrium disk detection method as claimed in claim 1, wherein, this start-up routine more includes the action of reading the contents table on this disc to be read.
4. non equilibrium disk detection method as claimed in claim 1, wherein, the intensity of variation that detects this tracking error signal be for detect this disc to be read revolve turn around after, this tracking error signal sweeps the vibratory output that the area stool and urine of being contained can be represented this disc, and sweep institute when containing area when this tracking error signal greater than a first threshold, assert that just this disc to be read is a non equilibrium disk.
5. non equilibrium disk detection method as claimed in claim 1 wherein, more is included in one the 3rd desired speed and carries out one second disc vibration detection step, and the 3rd desired speed is greater than this second desired speed and this first desired speed.
6. non equilibrium disk detection method as claimed in claim 5, wherein, this second disc vibration detection step comprises the following step:
Enter one and follow the tracks of closed condition; And
Whether detect the intensity of variation of a tracking error signal, using and judging this disc to be read is a non equilibrium disk.
7. non equilibrium disk detection method as claimed in claim 6, wherein, the intensity of variation that detects this tracking error signal be for detect this disc to be read revolve turn around after, this tracking error signal sweeps the vibratory output that the area stool and urine of being contained can be represented this disc, and sweep institute when containing area when this tracking error signal greater than one second threshold value, assert that just this disc to be read is a non equilibrium disk.
8. non equilibrium disk detection method as claimed in claim 1, its applied this disk reading device is to be a DVD drive and a DVD discs with this disc to be read.
9. non equilibrium disk detection method as claimed in claim 1, its applied this disk reading device is to be a CD drive and a CD discs with this disc to be read.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100283863A CN1297958C (en) | 2004-03-11 | 2004-03-11 | Method for detecting unbalanced discs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100283863A CN1297958C (en) | 2004-03-11 | 2004-03-11 | Method for detecting unbalanced discs |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1667707A CN1667707A (en) | 2005-09-14 |
| CN1297958C true CN1297958C (en) | 2007-01-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100283863A Expired - Fee Related CN1297958C (en) | 2004-03-11 | 2004-03-11 | Method for detecting unbalanced discs |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6295261B1 (en) * | 1997-11-25 | 2001-09-25 | Amsung Electronics Co., Ltd. | Method and apparatus for controlling revolution speed of spindle motor in optical disk drive |
| CN1480927A (en) * | 2002-07-22 | 2004-03-10 | 日本先锋公司 | Non-balance disc detector and non-balance disc detection method |
-
2004
- 2004-03-11 CN CNB2004100283863A patent/CN1297958C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6295261B1 (en) * | 1997-11-25 | 2001-09-25 | Amsung Electronics Co., Ltd. | Method and apparatus for controlling revolution speed of spindle motor in optical disk drive |
| CN1480927A (en) * | 2002-07-22 | 2004-03-10 | 日本先锋公司 | Non-balance disc detector and non-balance disc detection method |
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| Publication number | Publication date |
|---|---|
| CN1667707A (en) | 2005-09-14 |
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Owner name: GUANGBAO SCIENCE + TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: JIANXING ELECTRONIC SCIENCE +. TECHNOLOGY CO., LTD. Effective date: 20140702 |
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Effective date of registration: 20140702 Address after: Taipei City, Taiwan, China Patentee after: Lite-On Technology Corporation Address before: Taipei City, Taiwan, China Patentee before: Jianxing Electronic Science &. Technology Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070131 Termination date: 20150311 |
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