CN1577560A - Method for testing optical disc clamp magnetic performance - Google Patents
Method for testing optical disc clamp magnetic performance Download PDFInfo
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- CN1577560A CN1577560A CN 03150340 CN03150340A CN1577560A CN 1577560 A CN1577560 A CN 1577560A CN 03150340 CN03150340 CN 03150340 CN 03150340 A CN03150340 A CN 03150340A CN 1577560 A CN1577560 A CN 1577560A
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- clamp
- pallet
- magnetic
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Abstract
The CD clamp magnetism testing method is suitable for tray type CD driver. The abnormal magnetism of clamp in tray type CD driver will affect the CD withdrawing action, and the input voltage of DC motor may be controlled to regulate the withdrawing force of the tray to complete the withdrawing. The tray is tested and the measured distance of the tray during withdrawing is used as the reference for judging whether the clamp magnetism is normal.
Description
Technical field
The present invention relates to the clamp of pellet type CD-ROM drive, especially about a kind of method that is applied to the discs clamp magnetic test of pellet type CD-ROM drive.
Background of invention
Because the arriving in digitized information epoch, also grow with each passing day the deposited demand of the storage volume that the floppy disk (floppy disk) that generally is used in early days can provide for the demand of portable digital Storage Media with high power capacity.Therefore, just have high storage capacity, optical storage media and storage device thereof high-quality, that be easy to carry, be easy to characteristics such as preserving promptly are widely used, as CD-ROM drive (CD-ROM drive), CD writers (CD-R drive) or the like.
CD-ROM drive generally can be divided into pellet type (tray) and suction-type (slot-in) CD-ROM drive by the mode of disc turnover.Known pellet type CD-ROM drive has structure as shown in Figure 1a usually, consists predominantly of pallet 10 that carrying disc uses, CD is carried out the optical read/write head 20 of read-write motion, rotating disk (turntable) 30 that rotating disc is used and as the motor 40 of drive unit.Among Fig. 1 a, optical read/write head 20, rotating disk 30 all are arranged in the framework 50 with motor 40, and 10 on pallet is movably to be arranged on the framework 50.Motor 40 can be provided with more than one group, respectively in order to drive optical read head 20, rotating disk 30 and to be arranged on tooth belt group 52 on the framework 50.Have the supporting part 12 of depression on the pallet 10, be used for the carrying disc sheet, pallet 10 bottoms then are provided with tooth bar, can mesh with tooth belt group 52, and make the drive and framework 50 relative slips of pallet 10 by tooth belt group 52.In addition, be provided with a back up pad 26 in the framework 50, in order to support of optical read head 20 and rotating disk 30, make rotating disk 30 can stretch into the center pit of discs and drive discs rotation, and optical read head 20 can move with respect to discs.In addition; relative position when sliding with framework 50 for control pallet 10; usually meeting framework 50 is provided with the position detecting apparatus of pallet 10; for example promptly be provided with an inboard limit switch 54 and an outside limit switch 56 on the framework 50 of Fig. 1 a, the relative position when sliding with framework 50 with detecting pallet 10.
In addition, are rotated, typically use a clamp (clamper) device discs is fixed in rotating disk 30 for discs can be fixed with rotating disk 30.For example, Fig. 1 b is an example that shows the gripping mechanism that uses in the known CD-ROM drive, and wherein clamp 60 is to be arranged in the swing arm, can swing up and down with respect to rotating shaft 62, discs 1 is fixed in the rotating disk 30 that stretches into discs 1 center pit, but makes 1 rotation of rotating disk 30 stabilized driving discs.The fixing of 60 pairs of discs 1 of clamp can be complied with different mechanism design, adopts the elastomeric elastic force clamping or the variety of ways such as magnetic force absorption of electromagnet to carry out.
When user's desire is inserted discs 1 the pellet type CD-ROM drive with before carrying out read-write motion, at first must carry out the action of withdrawing from of pallet 30, pallet is skidded off outside the CD-ROM drive, discs 1 is positioned over the supporting part 12 of pallet 10 for the user, and then pallet 10 sent in the CD-ROM drive, make rotating disk 30 stretch into the center pit of discs 1.So, promptly can clamp 60 discs 1 be fixed in rotating disk 30, drive discs 1 rotation by rotating disk 30, and and then by optical read head 20 data are write discs 1, or by reading of data on the discs 1.
Generally speaking, for the operating efficiency that makes the pellet type CD-ROM drive promotes, use a direct current motor (DCmotor) usually as the motor 40 of control pallet 10 slips with clamp 60 holding actions.So, can control its outputting torsion and power, make pallet 10 carry out sending into or withdraw from when action of discs 1 by the input voltage of d.c. motor, but clamp 60 synchronization actions, to save the time that pallet 10 and clamp 60 move respectively.
Below please refer to Fig. 1 c, withdrawing from action with the pallet 10 of pellet type CD-ROM drive is example, and the flow process of d.c. motor 40 control pallets 10 and clamp 60 be described.When instruction (step S10) that the user withdraws from CD-ROM drive input pallet, d.c. motor 40 receives a leading portion input voltage, and drive clamp 60 and tooth belt group 52 (step S20) simultaneously, make clamp 60 discharge discs 1, and provide one to withdraw from power to pallet 10, prepare to drive pallet 10 and outwards withdraw from.The leading portion that this stage is a pallet 30 withdraws from action.When pallet 10 begins to move and when driving inboard limit switch 56, expression discs 1 has broken away from the location, finishes leading portion and withdraws from action (step S30); This moment, d.c. motor 40 can stop the driving of clamp 60, and continued to receive an input voltage, withdrawed from power drive pallet 10 with driven wheel belt group 52 with this and outwards withdrawed from (step S40).When pallet 10 slides to the CD-ROM drive outside and when driving outside limit switch 54 (step S50), expression pallet 10 has retreated to the outside, this moment, d.c. motor 40 can stop to drive (step S60), made pallet 10 stop to slide, and finished and withdrawed from action.
Yet, when if the pellet type CD-ROM drive adopts electromagnet as the clamp 60 of magnetic force adsorption type, because clamp 60 may be because of the defective on making, or the unusual condition in CD-ROM drive assembling or the operation, and the problem of generation magnetic anomaly, the action that can't adsorb chucking optical disk sheet 1 really.The problem that so not only may cause discs 1 normally to read, and when action is sent into or withdrawed to pallet 10 may be bad because of the absorption of clamp 60, and cause the phenomenon of discs 1 scratch, and action is sent into or withdrawed from influence.
At the problems referred to above, though can carry out the action that magnetic measures to clamp during fabrication, reduce the fraction defective of clamp magnetic, yet, clamp is carried out magnetic one by one to measure, can make the time cost of manufacturing process increase, not only waste time and energy, and can't prevent that still clamp from producing the problem of magnetic anomaly because of CD-ROM drive assembling or misoperation.
Summary of the invention
In view of this, a purpose of the present invention promptly is to propose a kind of method of discs clamp magnetic test, utilization is to the Control of Voltage of d.c. motor, parameter when the pallet of measurement pellet type CD-ROM drive withdraws from, as the foundation of judging that clamp magnetic is whether unusual, so can directly when the test of CD-ROM drive assembling, withdraw from the check action by easy pallet, whether the magnetic of test clamp is unusual, and do not need to carry out in addition the magnetic test of clamp.
The present invention discloses a kind of method of discs clamp magnetic test, is applicable to a pellet type CD-ROM drive.At first, provide the d.c. motor of a leading portion input voltage, carry out a leading portion with the pallet of driving tray formula CD-ROM drive and clamp and withdraw from action to the pellet type CD-ROM drive.After leading portion withdraws from action and finishes, provide than little and the not enough so that pallet of this leading portion input voltage finish withdraw from action a test voltage to d.c. motor, carry out withdrawing from test action with driving tray.When pallet withdraws from distance during greater than a specific range in withdrawing from test action, promptly represent the magnetic adsorptive power deficiency of clamp, so the decision clamp is a magnetic anomaly.
The method of a kind of discs clamp magnetic test provided by the present invention is applicable to a pellet type CD-ROM drive, and this method comprises the following step:
The direct current motor of one leading portion input voltage to this pellet type CD-ROM drive is provided, carries out a leading portion with the pallet that drives this pellet type CD-ROM drive and a magnetic clamp and withdraw from action;
Provide than little and not enough so that this pallet of this leading portion input voltage finish withdraw from action a test voltage to this d.c. motor, carry out withdrawing from test action to drive this pallet; And
Withdraw from distance during when this pallet withdraws from this in the test action, determine that this magnetic clamp is a magnetic anomaly greater than a specific range.
Described leading portion withdraws from action and comprises this magnetic clamp and break away from the action of a discs and the action that this pallet drives an inboard limit switch.
Described leading portion input voltage and test voltage are the input currents and the decision of output power ratio according to this d.c. motor.
Described leading portion input voltage comprises 6 volts first input voltage and 3.4 volts second input voltage.
Described test voltage comprises 2.2 volts a direct current voltage.
Because the method for discs clamp magnetic of the present invention test is after the pellet type CD-ROM drive is assembled, just carry out the magnetic of clamp and test, it is hereby ensured that clamp can not produce the problem of magnetic anomaly because of CD-ROM drive assembling or misoperation.
Description of drawings
Fig. 1 a is the stereographic map of the support holder structure of known pellet type CD-ROM drive;
Fig. 1 b is the synoptic diagram of the clamp structure of known pellet type CD-ROM drive;
Fig. 1 c is the process flow diagram that withdraws from action of pellet type CD-ROM drive;
Fig. 2 is the process flow diagram of method of the discs clamp magnetic test of one embodiment of the invention;
Fig. 3 is the input voltage and the time relation figure of d.c. motor in one embodiment of the invention.
Symbol description
1～discs;
10～pallet;
12～supporting part;
20～optical read head;
26～back up pad;
30～rotating disk;
40～motor;
50～framework;
52～tooth belt group;
54～inboard limit switch;
56～outside limit switch;
60～clamp;
62～rotating shaft;
110～leading portion input voltage;
112～the first input voltages;
114～the second input voltages;
120～test voltage.
Embodiment
As described in known techniques, in the pellet type CD-ROM drive, clamp may be because of the defective on making, or the unusual condition in CD-ROM drive assembling or the operation, and produces the problem of magnetic anomaly, the action that can't adsorb the chucking optical disk sheet really.At this moment,, then also can relatedly be affected probably, can't pallet be withdrawed from if this pellet type CD-ROM drive with clamp of magnetic anomaly is carried out the action of withdrawing from of pallet.
Therefore, the method of the discs clamp magnetic test that the present invention proposes, can influence the characteristic that pallet withdraws from action during promptly at the clamp magnetic anomaly, utilize the mode of control d.c. motor input voltage, adjust the power that withdraws from of pallet, make the power of withdrawing from carry out withdrawing from test action so that pallet is finished under the situation that withdraws from action to pallet, and the distance when withdrawing from by measurement that pallet withdraws from the test action, as the foundation of judging that clamp magnetic is whether unusual in deficiency.So, manufacturer does not need to carry out in addition the magnetic test of clamp in the processing procedure of pellet type CD-ROM drive, only need directly to withdraw from the check action by easy pallet when the CD-ROM drive assembling test, and whether the magnetic that can test clamp is unusual.
Below see also Fig. 2 and Fig. 3, specify the method for discs clamp magnetic test of the present invention with an embodiment.
The method of discs clamp magnetic of the present invention test is that the action of withdrawing from by pallet is improved, and is applicable to a pellet type CD-ROM drive, the pellet type CD-ROM drive shown in Fig. 1 a and Fig. 1 b for example, and wherein clamp 60 is the magnetic force adsorption type magnetic clamps that adopt electromagnet.
When manufacturer's desire of pellet type CD-ROM drive is carried out the test of clamp magnetic to a pellet type CD-ROM drive that assembles, test instruction (step S110) is withdrawed from input one at first earlier, at this moment, one leading portion input voltage can be delivered to the d.c. motor 40 of pellet type CD-ROM drive, carries out leading portion with the pallet 10 of driving tray formula CD-ROM drive and magnetic clamp 60 and withdraws from action (step S120).Particularly, this leading portion withdraws from action and general pallet and withdraws from leading portion in the action to withdraw from action identical, promptly as described in the step S20 and S30 of Fig. 1 c, after d.c. motor 40 receives the leading portion input voltage, drive magnetic clamp 60 and tooth belt group 52 simultaneously, make magnetic clamp 60 discharge discs 1, and provide one to withdraw from power to pallet 10, preparing to drive pallet 10 outwards skids off, begin to move and when driving inboard limit switch 56 up to pallet 10, expression discs 1 has broken away from the location, so promptly finishes leading portion and withdraws from action.
As described in the step S20 of Fig. 1 c, carry out leading portion and withdraw from when moving, d.c. motor 40 drives magnetic clamp 60 and tooth belt group 52 simultaneously, makes magnetic clamp 60 discharge discs 1, and provides one to withdraw from power to pallet 10, prepares to drive pallet 10 and outwards skids off.At this moment, if the magnetic adsorptive power of magnetic clamp 60 is normal, the action that then makes magnetic clamp 60 discharge discs 1 can consume the power that a part of d.c. motor 40 is provided, thereby the power that withdraws from of qualification pallet 10 is within the certain limit size; Yet if the magnetic anomaly of magnetic clamp 60, the power consumption that can make d.c. motor 40 be provided reduces in the part of magnetic clamp 60, thereby makes the power that withdraws from of pallet 10 become big relatively.Therefore, the magnetic adsorptive power of magnetic clamp 60 is low more, can make that then the power that withdraws from of pallet 10 is big relatively more, thereby influences follow-up pallet 10 and withdraw from action.
According to above-mentioned principle, leading portion withdraw from the action finish after, can provide little than the leading portion input voltage, and deficiency so that pallet 10 finish withdraw from action a test voltage to d.c. motor 40, carry out withdrawing from test action (step S130) with driving tray 10.Because test voltage is to be made as deficiency so that pallet 10 is finished the size that withdraws from action, so pallet 10 can't withdraw from fully to the outside, this moment pallet 10 withdraw from distance and leading portion withdraw from pallet in the action suffered to withdraw from power relevant.If it is big more that leading portion withdraws from the action power that withdraws from of pallet 10, then pallet 10 to withdraw from distance far away more; Otherwise, leading portion withdraw from pallet 10 in the action to withdraw from power more little, then pallet 10 to withdraw from distance near more.In other words, pallet 10 withdraw from distance when far away, promptly represent leading portion withdraw from pallet 10 in the action to withdraw from power bigger, that is the magnetic adsorptive power of magnetic clamp 60 is less.
Withdraw from after the test action, can measure pallet 10 and in withdrawing from test action, withdrawing from distance (step S140), and judge the withdrawing from apart from whether greater than a specific range (step S150) of pallet 10.This specific range can obtain by experiment.When pallet 10 withdraw from distance during greater than this specific range, promptly represent the magnetic adsorptive power deficiency of magnetic clamp 60, so decidable magnetic clamp 60 is magnetic anomaly (step S160), must change; And when pallet 10 withdraw from distance during not greater than this specific range, represent that promptly the magnetic adsorptive power of magnetic clamp 60 is normal, so decidable magnetic clamp 60 closes in standard (step S170).
Fig. 3 shows in the discs clamp magnetic test process of present embodiment the input voltage of d.c. motor 40 and time relation.Among Fig. 3, leading portion input voltage 110 is to adopt 6 volts first input voltage 112 and 3.4 volts second input voltage 114, so that d.c. motor 40 can successfully drive magnetic clamp 60 and tooth belt group 52 simultaneously, make magnetic clamp 60 discharge discs 1, and the power that withdraws from that pallet 10 is outwards slided is provided.And withdraw from the test action, 120 employings of test voltage are significantly less than 2.2 volts DC voltage of second input voltage 114, make pallet 10 be not enough to finish to withdraw from action, and can withdraw from test action.
In this mandatory declaration, leading portion input voltage 110 of the present invention and test voltage 120 are that input current and the output power of the d.c. motor 40 that adopted with the pellet type CD-ROM drive is than relevant, therefore at the structure of different pellet type CD-ROM drives, can be with reference to the characteristic of d.c. motor 40, utilize experiment and obtain the suitable leading portion input voltage 110 and the value of test voltage 120.
Method by discs clamp magnetic test of the present invention, the manufacturer of pellet type CD-ROM drive is in the processing procedure of pellet type CD-ROM drive, do not need to carry out in addition the magnetic test of clamp, only need directly when the CD-ROM drive assembling test, to withdraw from the check action by easy pallet, whether the magnetic that can test clamp is unusual, thereby need not increase extra time cost, can guarantee the probability of clamp magnetic anomaly.
In addition,, just carry out the magnetic of clamp and test, it is hereby ensured that clamp can not produce the problem of magnetic anomaly because of CD-ROM drive assembling or misoperation because the method for discs clamp magnetic of the present invention test is after the pellet type CD-ROM drive is assembled.
Though the present invention discloses as above with concrete preferred embodiment; right its is not in order to limit the present invention; anyly have the knack of this skill person; without departing from the spirit and scope of the present invention; still can do a little change and retouching, so protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.
Claims (5)
1, a kind of method of discs clamp magnetic test is applicable to a pellet type CD-ROM drive, it is characterized in that this method comprises the following step:
The direct current motor of one leading portion input voltage to this pellet type CD-ROM drive is provided, carries out a leading portion with the pallet that drives this pellet type CD-ROM drive and a magnetic clamp and withdraw from action;
Provide than little and not enough so that this pallet of this leading portion input voltage finish withdraw from action a test voltage to this d.c. motor, carry out withdrawing from test action to drive this pallet; And
Withdraw from distance during when this pallet withdraws from this in the test action, determine that this magnetic clamp is a magnetic anomaly greater than a specific range.
2, the method for discs clamp magnetic as claimed in claim 1 test is characterized in that: this leading portion withdraws from action and comprises this magnetic clamp and break away from the action of a discs and the action that this pallet drives an inboard limit switch.
3, the method for discs clamp magnetic test as claimed in claim 1 is characterized in that: this leading portion input voltage and this test voltage are the input currents and the decision of output power ratio according to this d.c. motor.
4, the method for discs clamp magnetic test as claimed in claim 1, it is characterized in that: this leading portion input voltage comprises 6 volts first input voltage and 3.4 volts second input voltage.
5, the method for discs clamp magnetic test as claimed in claim 4, it is characterized in that: this test voltage comprises 2.2 volts a direct current voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03150340 CN1251222C (en) | 2003-07-28 | 2003-07-28 | Method for testing optical disc clamp magnetic performance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03150340 CN1251222C (en) | 2003-07-28 | 2003-07-28 | Method for testing optical disc clamp magnetic performance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1577560A true CN1577560A (en) | 2005-02-09 |
| CN1251222C CN1251222C (en) | 2006-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03150340 Expired - Fee Related CN1251222C (en) | 2003-07-28 | 2003-07-28 | Method for testing optical disc clamp magnetic performance |
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| Country | Link |
|---|---|
| CN (1) | CN1251222C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7349313B2 (en) * | 2003-07-16 | 2008-03-25 | Lite-On It Corporation | Clamper magnetism test method for a tray-type optical drive |
-
2003
- 2003-07-28 CN CN 03150340 patent/CN1251222C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7349313B2 (en) * | 2003-07-16 | 2008-03-25 | Lite-On It Corporation | Clamper magnetism test method for a tray-type optical drive |
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| Publication number | Publication date |
|---|---|
| CN1251222C (en) | 2006-04-12 |
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Granted publication date: 20060412 |