CN100380109C - Method for detecting safety of optic disc driver machine casing structure and its detecting optic disc used thereof - Google Patents
Method for detecting safety of optic disc driver machine casing structure and its detecting optic disc used thereof Download PDFInfo
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- CN100380109C CN100380109C CNB2004100787583A CN200410078758A CN100380109C CN 100380109 C CN100380109 C CN 100380109C CN B2004100787583 A CNB2004100787583 A CN B2004100787583A CN 200410078758 A CN200410078758 A CN 200410078758A CN 100380109 C CN100380109 C CN 100380109C
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000003287 optical effect Effects 0.000 claims abstract description 124
- 238000012360 testing method Methods 0.000 claims abstract description 52
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000012634 fragment Substances 0.000 abstract description 14
- 238000002474 experimental method Methods 0.000 description 9
- 230000006378 damage Effects 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 4
- 230000009172 bursting Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
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- 230000001066 destructive effect Effects 0.000 description 1
- 238000012854 evaluation process Methods 0.000 description 1
- 239000005457 ice water Substances 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The present invention relates to a method for testing the structure safety of a shell of an optical disk driver. Three radical cracks are made on a used optical disk for testing, and the included angle between every two radical cracks is 120 degrees. After the optical disk for testing is put into an optical disk driver to be tested, the optical disk driver is started to make the optical disk for testing rotate at a predetermined rotating speed, the radical cracks of the optical disk grow to generate fragments in order to impact a shell of the optical disk driver, and then the impact state of the shell of the optical disk driver is inspected.
Description
Technical Field
The invention relates to a method for testing the safety of a shell of an optical disk drive, in particular to a method for testing the damage state of a broken disk by impacting the shell of the optical disk drive through rotating a test optical disk at a high speed and then inspecting the damage state and the test optical disk used by the method.
Background
With the increasing of the reading times of the optical disc drive, the rotation speed of the spindle motor therein is also increasing. In the 56 times optical disc drive, the spindle motor usually rotates at about ten thousand revolutions. In contrast, the optical disc is made of plastic particles and dye, and the strength of the material is obviously insufficient. Therefore, under such high speed rotation, if the optical disc is in unbalanced rotation, the surface of the optical disc is scratched, and the defect of the optical disc is easily broken in a very short time, i.e. so-called burst.
The burst fragments of the disc tend to have high kinetic energy and are thrown by centrifugal force to impact the disc drive housing structure. If the casing structure of the optical disc drive is not sufficient to bear the impact to cover the burst fragments in the optical disc drive, the scattered fragments will cause great harm to the safety of users. Therefore, it is necessary to ensure sufficient strength of the structure of the optical disc drive and to provide sufficient covering to prevent the scattering of the broken pieces outside the optical disc drive.
Generally, in order to evaluate whether the disc drive can sufficiently withstand the impact of the disc fragments, the most direct method is to use the disc burst test. The spindle motor of the CD driver drives the CD to rotate at high speed until the CD bursts to impact the casing structure of the CD driver. However, the reason and mechanism for breaking the optical disc is not clear, and the time required for the optical disc to rotate and break, the size of the broken fragments, and the impact angle of the broken fragments with respect to the optical disc drive are random and unpredictable. Therefore, the experimental time is long, and a large amount of experimental results are required to support experimental data.
In order to shorten the time required for the disk burst test, many methods have been proposed to degrade the optical disk, such as: irradiating with light, soaking in ice water, and alternating high and low temperature. The experiments prove that the method cannot effectively shorten the time required by the disk burst experiment. Also, these methods do not control the size of the disc fragments and the angle at which the fragments strike the disc drive.
Disclosure of Invention
In view of the above, the present invention is directed to a method for testing the safety of a chassis structure of an optical disc drive, so as to shorten the time required for an optical disc burst test and generate more reliable test data.
Another object of the present invention is to provide an optical disc for burst test, which has maximum momentum of the broken disc after spin-breaking.
The invention relates to a method for testing the safety of a shell structure of an optical disk drive, which is to manufacture three radial cracks on an optical disk to be tested, wherein the included angle between every two cracks is 120 degrees. After the optical disk for testing is put into the optical disk drive to be tested, the optical disk drive is started to rotate the optical disk for testing at a preset rotating speed, so that radial cracks grow, and the optical disk for testing is crushed to generate cracks to impact the shell of the optical disk drive. Then, the impact state of the optical disk drive chassis is inspected.
The advantages and spirit of the present invention can be further understood by the following detailed description and the accompanying drawings.
Drawings
FIG. 1 is a schematic view of a fan-shaped lobe.
FIG. 2 is a schematic view of a test disc with three pre-embossed radial cracks according to a preferred embodiment of the present invention.
FIG. 3 is a schematic view of another embodiment of a test optical disc having three radial cracks pre-embossed therein.
FIG. 4 is a schematic view of a test disc having three pre-embossed radial cracks according to still another embodiment of the present invention.
FIG. 5 is a flow chart of a burst test experiment according to a preferred embodiment of the present invention.
Detailed Description
On the premise of assuming that the optical disc is broken in a fan shape, please refer to fig. 1, assuming that the thickness of the optical disc is t and the vertex angle of the fan-shaped fragment of the optical disc is 2 α.
The mass m of one-half of the fan-shaped fragments (with the apex angle) is:
Where ρ is the density of the optical disk, v is the volume of the sector, r is the distance from the center C of the optical disk, and r is the distance from the center C of the optical disk0And r1Respectively representing the distance between the inner edge and the outer edge of the optical disk from the center of circle C.
The distance between the mass center M of the fan-shaped debris and the center C of the circleComprises the following steps:
Where ρ t (rd θ dr) corresponds to the mass of portion a in the figure, and the distance from the center C of portion a is r.
From the above equations (1) and (2), it can be known that:
Substituting the formula (3), the moving speed V of the mass center M of the fan-shaped debris is:
Wherein,is representative of the rotational speed of the center of mass M relative to the center C of the circle.
The moving kinetic energy KE of the fan-shaped chips is:
Bearing equation (5) at a fixed rotational speed
In relation to the size of the optical disc, i.e. under the condition of the optical disc
And r are both constants. The maximum kinetic energy of movement occurs:
It can be known that ........... equation (7)
2asin acos a-sin represented by formula (7)2Since a is 0 and a is 66.8 °, the whole fan-shaped debris can generate the maximum kinetic energy of movement at the top angle of 133.6 degrees (close to one third of the central angle), i.e. the maximum damage to the optical disk drive casing.
From the formula (5), when the vertex angle of the fan-shaped debris is 120 degrees, the ratio of the moving kinetic energy to the maximum moving kinetic energy is:
it can be seen that the kinetic energy of movement of the two differs by less than 2%. Therefore, if the burst of the optical disc can be controlled to generate fan-shaped fragments with the apex angle of about 120 degrees, it can be ensured that the optical disc will cause the largest damage to the outer casing of the optical disc drive in the experiment. The disc drive can withstand the destructive force and can also withstand the impact of the fragments generated by other disc bursting mechanisms.
Based on the above calculation, to ensure the burst of the optical disc, fan-shaped fragments with consistent size and apex angle close to 120 degrees are generated. Referring to FIG. 2, in a preferred embodiment of the present invention, three radial cracks 12 with equal length are formed on the optical disk 10 and extend from the outer edge of the optical disk to the center C, and the included angle b between the cracks is between 100 degrees and 140 degrees.
Since the burst direction of each split is difficult to predict when the disc is burst, in a preferred embodiment, the radial cracks 12 must be radially arranged around the center C of the disc 10 to ensure that the splits have the same kinetic energy. Therefore, referring to FIG. 3, another embodiment of the optical disk for testing of the present invention is shown, in which the included angle between the radial cracks 14 is 120 degrees, so as to ensure that the cracks have the same kinetic energy, thereby improving the reliability of the burst test result of the optical disk.
It should be noted that, since the rotational speed of the optical disc also has a significant influence on the kinetic energy of the optical disc split, the test optical disc 10 must burst after the optical disc drive reaches a predetermined rotational speed (i.e. the maximum rotational speed set by the optical disc drive). In order to avoid the premature burst of the optical disk 10, the radial crack 14 must be spaced apart from the inner edge 10a of the optical disk 10 by a sufficient distance d 1. In addition, in order to shorten the time required for the burst test experiments, the radial crack 14 must have a sufficient length d 2. Therefore, in a preferred embodiment, as shown in FIG. 3, the distance d1 between the end 14a of the radial crack and the inner edge 10a of the optical disk is between 15mm and 1mm to meet the above requirement.
Referring to FIG. 4, another embodiment of an optical disk for testing according to the present invention is shown. Compared with the embodiment shown in FIG. 2, the optical disk 10 of the present embodiment has three radial cracks 16 with equal lengths and extending from the inner edge of the optical disk to the direction away from the center C, and the distance between the radial crack 16 and the outer edge of the optical disk 10 is between 15mm and 1 mm.
The purpose of making radial cracks is to accelerate the occurrence of disk burst, so the cutting method is not limited to the method from the center of a circle to the outside of a circle or from the outside of a circle to the center of a circle, and the two cutting methods can also be used in combination. However, the cutting method must crack the optical disc to generate three fan-shaped cracks with similar sizes.
Referring to fig. 5, a preferred embodiment of the burst test experimental process of the present invention is shown. In step 100, after a test optical disc is provided, three radial cracks are directly formed on the test optical disc, and the included angle between the cracks is 120 degrees. Then, in step 120, the test optical disc is placed in the optical disc drive to be tested. Then, in step 140, the optical disc drive is started to gradually increase the rotation speed of the optical disc for testing to reach the predetermined rotation speed. At this rotation speed, radial cracks of the test optical disc grow, which causes the test optical disc to break and generate cracks to impact the chassis of the optical disc drive. Finally, in step 160, the impact status of the optical disc drive casing is checked to determine whether the design of the optical disc drive casing is proper. Generally, the predetermined rotation speed in step 140 refers to the maximum rotation speed of the disc drive motor or the maximum rotation speed set in the firmware of the disc drive.
Compared with the conventional disk burst experiment, the disk burst experiment of the invention has the following advantages:
referring to FIG. 2, by cutting the radial crack 12 on the test optical disk 10, the time required for the optical disk 10 to burst can be shortened, thereby shortening the experimental time.
Referring to FIG. 3, the three radial cracks 14 are cut symmetrically on the optical disk 10 to ensure the shape and size of the optical disk 10, so as to improve the reliability of the experiment, i.e. reduce the repetition of the experiment.
Referring to FIG. 2, three radial cracks 12 are cut on the optical disk 10, and the included angle b of each radial crack 12 is selected from 100 to 140 degrees, so as to ensure that the maximum kinetic energy of the optical disk 10 can be achieved to cause the maximum damage to the optical disk drive chassis. The most rigorous experimental conditions can be provided to speed up the evaluation process of the chassis strength of the optical disc drive.
Referring to FIG. 3, the distance between the end 14a of the radial crack and the inner edge 10a of the optical disc is set within a certain range. Therefore, the timing of the disc bursting can be relatively improved.
While the invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes and modifications can be made, and equivalents can be substituted, without departing from the spirit and scope of the invention.
Claims (10)
1. An optical disk for high-speed breaking test of optical disk is composed of three radial cracks, each of which has an included angle between 100 and 140 deg for maximizing the momentum of broken optical disk.
2. The optical disk as claimed in claim 1, characterized in that the three radial cracks are equal in length.
3. The optical disk as claimed in claim 1, wherein said radial crack extends from the outer edge of said optical disk toward the center of said circle.
4. The optical disk of claim 3 wherein the distance between the radial crack and the inner edge of the optical disk is between 15mm and 1 mm.
5. The optical disk of claim 1 wherein said radial crack extends from the inner edge of said optical disk in a direction away from the center of said disk.
6. The optical disk as claimed in claim 5, characterized in that the distance between the radial crack and the outer edge of the optical disk is between 15mm and 1 mm.
7. A method for testing the security of the chassis structure of an optical disk drive at least comprises the following steps:
providing a test optical disc;
manufacturing three radial cracks on the optical disk for testing, wherein the included angle between every two cracks is between 100 and 140 degrees;
placing the test optical disk into the optical disk drive to be tested;
starting the optical disk drive to rotate the test optical disk at a preset rotation speed to cause the radial crack to grow, so that the test optical disk is broken to generate a crack to impact the shell of the optical disk drive; and
inspecting the impact state of the optical disk drive casing.
8. The method as claimed in claim 7, wherein the radial crack is carved from the outer edge of the test optical disc toward the center of the circle, and the distance between the radial crack and the inner edge of the test optical disc is between 1mm and 15mm, so as to ensure that the test optical disc will be broken when rotating and the test optical disc is accelerated to a predetermined rotation speed before breaking.
9. The method as claimed in claim 7, wherein the radial crack is carved from the inner edge of the test optical disc away from the center of the circle, and the distance between the radial crack and the outer edge of the test optical disc is between 1mm and 15mm to ensure that the test optical disc will be broken when rotating and the test optical disc is accelerated to a predetermined rotation speed before breaking.
10. The method as claimed in claim 7, wherein the predetermined rotation speed is a factory-set maximum rotation speed of the optical disc drive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100787583A CN100380109C (en) | 2004-09-16 | 2004-09-16 | Method for detecting safety of optic disc driver machine casing structure and its detecting optic disc used thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100787583A CN100380109C (en) | 2004-09-16 | 2004-09-16 | Method for detecting safety of optic disc driver machine casing structure and its detecting optic disc used thereof |
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| CN1749731A CN1749731A (en) | 2006-03-22 |
| CN100380109C true CN100380109C (en) | 2008-04-09 |
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| CNB2004100787583A Expired - Fee Related CN100380109C (en) | 2004-09-16 | 2004-09-16 | Method for detecting safety of optic disc driver machine casing structure and its detecting optic disc used thereof |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020075794A1 (en) * | 2000-12-20 | 2002-06-20 | Samsung Electronics Co., Ltd. | Disk-type recording medium having a crack hindering element |
| CN1506956A (en) * | 2002-12-10 | 2004-06-23 | 明基电通股份有限公司 | Explosion-proof CD |
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- 2004-09-16 CN CNB2004100787583A patent/CN100380109C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020075794A1 (en) * | 2000-12-20 | 2002-06-20 | Samsung Electronics Co., Ltd. | Disk-type recording medium having a crack hindering element |
| CN1506956A (en) * | 2002-12-10 | 2004-06-23 | 明基电通股份有限公司 | Explosion-proof CD |
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| CN1749731A (en) | 2006-03-22 |
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