CN1251221C

CN1251221C - Method for determining withdraw force of tray

Info

Publication number: CN1251221C
Application number: CN 03149710
Authority: CN
Inventors: 李宜忠
Original assignee: Lite On IT Corp
Current assignee: Lite On IT Corp
Priority date: 2003-08-06
Filing date: 2003-08-06
Publication date: 2006-04-12
Anticipated expiration: 2023-08-06
Also published as: CN1581331A

Abstract

The present invention relates to a method for determining the withdrawal force of a tray, which is suitable for the withdrawal actions of trays of tray type optical drives. In the method for determining the withdrawal force of a tray, which is provided by the present invention, the tightness of a tray is determined through measuring the consumption time of a forepart withdrawal action during the withdrawal of the tray of a tray type optical drive by aiming at the excessive looseness problem or the excessive tightness problem generated by the tolerance or the match of the tray; the control voltage of a direct current motor is changed so as to adjust the amplitude of the withdrawal force of the tray by aiming at the tightness of the tray, and thereby, the problem that the abnormal withdrawal of the tray occurs owing to the excessive looseness or the excessive tightness of the tray is avoided.

Description

The decision pallet withdraws from the method for power

Technical field

The pallet that the present invention relates to the pellet type CD-ROM drive withdraws from action, withdraws from the method for power in particular to a kind of pallet that determines.

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 drives clamp 60 and tooth belt group 52 (step S20) simultaneously with a leading portion input voltage, make clamp 60 discharge discs 1, and provide one to withdraw from power, prepare to drive pallet 10 and outwards withdraw from pallet 10.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 54, 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, withdrawed from power with this and drove pallet 10 and outwards withdraw from (step S40) and continue driven wheel belt group 52.When pallet 10 slides to the CD-ROM drive outside and when driving outside limit switch 56 (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 the pellet type CD-ROM drive because on business poor each other problem such as cooperate such as the pallet 10 of manufacturing and framework 50 members such as grade makes when two groups of pallets 10 with spline structure carry out relative the slip with framework 50, can produce the different phenomenon of elasticity therebetween during fabrication.The pallet 10 of pine only needs less torsion to drive, and tighter pallet 10 torsion that then needs are bigger could drive.At this moment, if any pellet type CD-ROM drive is all adopted the driving voltage of identical input voltage as d.c. motor 40, then may make some pine or tighter pallet 10 withdraw from unusual problem, below explanation respectively.

When a pellet type CD-ROM drive had loose pallet 10, the torsion that d.c. motor 40 is provided may be excessive relatively situation.At this moment, if the pellet type CD-ROM drive is the state vertically put, then can be excessive owing to the power that withdraws from that d.c. motor 40 provides, and make and produce a bigger reacting force when pallet 10 withdraws from, thereby make discs 1 impacted by reacting force and skid off pallet 10, so may cause the breakage of discs 1.

On the other hand, when a pellet type CD-ROM drive had tighter pallet 10, the torsion that d.c. motor 40 is provided may be too small relatively situation.At this moment, pallet 10 is among leading portion withdraws from action, may be because the power that the withdraws from deficiency of d.c. motor 40, can't be successfully driven wheel belt group 52 and clamp 60 simultaneously, and make that the rate of withdraw of pallet 10 is slow excessively, or clamp 60 does not break away from discs 1 fully, so all may make pallet 10 block after leading portion withdraws from release, and the structure of pallet 10 with discs 1 all damaged.

Summary of the invention

In view of this, the objective of the invention is to propose a kind of pallet that determines and withdraw from the method for power, withdraw from the spent time of action at leading portion when withdrawing from by the pallet that measures the pellet type CD-ROM drive, as the foundation that estimates the pallet elasticity, and adjust the size that pallet withdraws from power by the mode of the control voltage that changes d.c. motor, withdraw from unusual problem to avoid pallet.

A kind of pallet that determines withdraws from the method for power, is applicable to a pellet type CD-ROM drive, and this method comprises the following step:

The direct current motor of leading portion input voltage to this pellet type CD-ROM drive is provided, carries out a leading portion with a pallet that drives this pellet type CD-ROM drive and withdraw from action, described leading portion withdraws from action and comprises a clamp and break away from the action of a discs and the action that this pallet withdraws from;

When carrying out time that this leading portion withdraws from action than a special time in short-term, provide than the little one first control voltage of this leading portion input voltage to this d.c. motor, carry out withdrawing from action to drive this pallet; And

When time that this leading portion withdraws from action is long than this special time, provide than big-second control voltage of this first control voltage to this d.c. motor, carry out this and withdraw from action to drive this pallet.

Described decision pallet withdraws from the method for power, and the step that this leading portion input voltage wherein is provided is to carry out after receiving an exit instruction.

Described exit instruction is to import by an ESC Escape of the panel of pushing this pellet type CD-ROM drive.

Described leading portion withdraws from action and also comprises the action that this pallet drives an inboard limit switch.

Described leading portion input voltage, the first control voltage and the second control 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.

The described first control voltage comprises 3 volts DC voltage, and the second control voltage comprises 3.5 volts DC voltage.

Described special time be 28 microseconds (ms, microsecond).

Decision pallet according to the present invention withdraws from the method for power, and regardless of the pallet elasticity of pellet type CD-ROM drive, it withdraws from power all can obtain suitable adjustment, thereby can significantly reduce pallet and withdraw from unusual probability, improves the fiduciary level of pellet type CD-ROM drive.

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 that the decision pallet of one embodiment of the invention withdraws from the method for power;

Fig. 3 a is input voltage and the time relation figure that shows d.c. motor among the loose embodiment of pallet;

Fig. 3 b is input voltage and the time relation figure that shows d.c. motor among the tighter embodiment of pallet.

Embodiment

As described in known techniques, when the pellet type CD-ROM drive had loose pallet, the torsion that d.c. motor provided may be excessive relatively situation; And when the pellet type CD-ROM drive had tighter pallet, the torsion that d.c. motor provided may be too small relatively situation.No matter pallet is crossed pine or tension, all may withdraw from unusual problem, thereby causes the structural failure or the injury of discs or CD-ROM drive.

Therefore, the decision pallet that the present invention proposes withdraws from the method for power, promptly cross the problem of pine or tension at pallet, withdraw from the spent time of action at leading portion when withdrawing from by the pallet that measures the pellet type CD-ROM drive, judge the elasticity of pallet, and the control voltage of change d.c. motor, adjust the size that pallet withdraws from power with elasticity at pallet, so can avoid pallet to withdraw from unusual problem because of crossing pine or tension.

Below see also Fig. 2, Fig. 3 a and Fig. 3 b, specify the method that decision pallet of the present invention withdraws from power 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, for example the pellet type CD-ROM drive shown in Fig. 1 a and Fig. 1 b.When user's desire withdraws from the discs in the pellet type CD-ROM drive, at first must import the instruction (step S110) that a pallet withdraws to CD-ROM drive earlier, for example import exit instruction by the action of pushing the ESC Escape on the pellet type CD-ROM drive panel.At this moment, a 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 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 clamp 60 and tooth belt group 52 simultaneously, make 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 54 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 pallet 10 pine represents that then the torsion that d.c. motor 40 provided is excessive relatively, and make the pallet 10 very fast positions that drive inboard limit switch 54 that arrive; Otherwise,, represent that then the torsion that d.c. motor 40 provided is too small relatively, and make pallet 10 arrive the position of the inboard limit switch 54 of driving more slowly if pallet 10 is tighter.Therefore, the elasticity of pallet 10 is to arrive the spent time correlation in position that drives inboard limit switch 54 with pallet 10, that is carries out leading portion with pallet 10 and withdraw from the spent time correlation of action.

According to above-mentioned principle, after leading portion withdraws from action and finishes, can obtain leading portion and withdraw from the spent time T x (step S130) that carries out of action, and judge that this one carries out time T x how the person grows (step S140) with a special time Tp.This special time Tp can obtain by experiment.Wherein, calculating the method carry out time T x, is to measure to deliver to d.c. motor 40 by the leading portion input voltage, begins to drive to carry out leading portion to withdraw from and move the time till the inboard limit switch of pallet 10 drivings; And special time Tp can utilize the method for statistics, withdraws from after the experiment by carrying out repeatedly pallet, draws according to the resulting numerical value that carries out time T x of each experiment.

What present segment withdrawed from action carries out time T x than special time Tp in short-term, then represent pine of pallet 10, therefore should reduce the power of withdrawing from this moment, can provide than the little first control voltage of leading portion input voltage to d.c. motor 40, withdraws from action (step S150) with driving tray 10.Because the first control voltage is little than the leading portion input voltage, therefore make that withdrawing from power reduces relatively, relatedly make the reacting force when pallet 10 withdraws from diminish, thereby reduce the impact that discs 1 is subjected to; So, even this pellet type CD-ROM drive is the state for vertically putting, also can significantly reduce the probability that discs 1 skids off pallet 10.In addition, special time Tp can be realized by software with the judgement of carrying out the time length of time T x, also can realize with hardware circuit,

On the other hand, what present segment withdrawed from action carries out time T x when long than special time Tp, represents that then pallet 10 is tighter, and should increase the power of withdrawing from this moment, therefore can provide than the big second control voltage of the first control voltage to d.c. motor 40, withdraw from action (step S160) with driving tray 10.Because the second control voltage is big than the first control voltage, make that therefore withdrawing from power increases relatively, so can promote the rate of withdraw of pallet 10, even clamp 60 does not break away from discs 1 fully, also can clamp 60 be continued band from discs 1 by the power that withdraws from that increases.Therefore, the probability that pallet 10 blocks after leading portion withdraws from release significantly reduces, and can increase the security of pallet 10 and discs 1.

Fig. 3 a shows among the embodiment of pallet 10 than the pellet type CD-ROM drive of pine the input voltage of d.c. motor 40 and time relation.Among Fig. 3 a, 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.Because pallet 10 is pine, make leading portion withdraw from action to carry out time T x short than special time Tp=28ms, thereby as described in the step S150 of Fig. 2, employing 3 volt the DC voltage little than the leading portion input voltage controlled voltage 120 as first, deliver to d.c. motor 40, withdraw from action with driving tray 10.

In addition, Fig. 3 b then is among the embodiment of the pellet type CD-ROM drive that shows that pallet 10 is tighter, the input voltage of d.c. motor 40 and time relation.Among Fig. 3 b, leading portion input voltage 110 is identical with Fig. 3 a, is to adopt 6 volts first input voltage 112 and 3.4 volts second input voltage 114.Because pallet 10 is tighter, make leading portion withdraw from action to carry out time T x long than special time Tp=28ms, thereby as described in the step S160 of Fig. 2, employing is controlled voltage 130 than the first control voltage, 120 3.5 volts big DC voltage as second, deliver to d.c. motor 40, withdraw from action with driving tray 10.

In this mandatory declaration, leading portion input voltage of the present invention 110, the first control voltage 120 and the second control voltage 130 are characteristics of the d.c. motor 40 that adopted with the pellet type CD-ROM drive, for example input current and output power are 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 value of suitable leading portion input voltage 110, the first control voltage 120 and the second control voltage 130.

In addition, in the foregoing description, be the value that adopts special time Tp=28ms, in order to foundation as judgement pallet 10 elasticities.Yet,, can utilize experiment equally and obtain the value of suitable special time Tp at the structure of different pellet type CD-ROM drives.

Withdraw from the method for power by decision pallet of the present invention, no matter the pallet elasticity of pellet type CD-ROM drive why, and it withdraws from power all can obtain suitable adjustment, thereby can significantly reduce pallet and withdraw from unusual probability, improves the fiduciary level of pellet type CD-ROM drive.

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 claims scope person of defining that protection scope of the present invention ought be looked is as the criterion.

Claims

1, a kind of pallet that determines withdraws from the method for power, is applicable to a pellet type CD-ROM drive, it is characterized in that this method comprises the following step:

When time that this leading portion withdraws from action is long than this special time, provide than the big one second control voltage of this first control voltage to this d.c. motor, carry out this and withdraw from action to drive this pallet.

2, decision pallet as claimed in claim 1 withdraws from the method for power, it is characterized in that: the step that this leading portion input voltage is provided is to carry out after receiving an exit instruction.

3, decision pallet as claimed in claim 2 withdraws from the method for power, it is characterized in that: this exit instruction is to import by an ESC Escape of the panel of pushing this pellet type CD-ROM drive.

4, decision pallet as claimed in claim 1 withdraws from the method for power, it is characterized in that: this leading portion withdraws from action and also comprises the action that this pallet drives an inboard limit switch.

5, decision pallet as claimed in claim 1 withdraws from the method for power, it is characterized in that: this leading portion input voltage, this first control voltage and this second control voltage are the input currents and the decision of output power ratio according to this d.c. motor.

6, decision pallet as claimed in claim 1 withdraws from the method for power, it is characterized in that: this leading portion input voltage comprises 6 volts first input voltage and 3.4 volts second input voltage.

7, decision pallet as claimed in claim 6 withdraws from the method for power, it is characterized in that: this first control voltage comprises 3 volts DC voltage, and this second control voltage comprises 3.5 volts DC voltage.

8, decision pallet as claimed in claim 6 withdraws from the method for power, it is characterized in that: this special time is 28 microseconds.