CN100336131C

CN100336131C - Optical drive with disk damage prevention and method thereof

Info

Publication number: CN100336131C
Application number: CNB2004100543540A
Authority: CN
Inventors: 黄孝均; 金钟满
Original assignee: Shanghai LG Electronics Co Ltd
Current assignee: Shanghai LG Electronics Co Ltd
Priority date: 2004-09-08
Filing date: 2004-09-08
Publication date: 2007-09-05
Anticipated expiration: 2024-09-08
Also published as: CN1747050A

Abstract

The present invention relates to an optical driver with the function of preventing an optical disk from being damaged. The present invention has the purposes of preventing the central part of an optical disk arranged in the optical driver from cracking and preventing a generated crack from being further enlarged. The optical driver is composed of a heating method comprising a central part of a heating optical disk, etc. The optical driver can prevent cracks, such as scratch, etc. generated in the optical disk which rotates at a high speed from being enlarged under the action of centrifugal force. Meanwhile, the optical driver can generate a thermal stress in order to prevent the interior of the optical disk from cracking, and the optical driver can also prevent and reduce the damage of the optical disk when the optical disk rotates at a high speed. The present invention provides an optical driver with the function of preventing an optical disk from being damaged and an operation method for preventing the optical disk in the optical driver from being damaged.

Description

Have the CD-ROM drive and the method that prevent the damaged function of CD

[technical field]

The present invention is the invention of relevant CD-ROM drive, and it is to have as the CD-ROM drive of operation high speed rotating CD can suppress the generation that the readable part of disk inner is similar to the increasing of slight cracks such as scuffing and suppresses slight crack, the damage of CD in the time of also can reducing high speed rotating.Therefore, it is to have the CD-ROM drive that prevents CD damage, the method that also provides the CD that prevents from just to use in CD-ROM drive to be damaged.

[background technology]

Generally speaking, the data that comprise sound and image are called as CD with the digital form recorded information with light video disc and the digital multi-usage video disc onesize with light video disc, that utilize the short red semiconductor laser of wavelength can increase the record data capacity of cheating or selecting as the record form.

Fig. 1 is the front view (FV) of the formation of existing CD.Fig. 2 is showed in the mode of concept map for the explanation fracture phenomenon.CD by the axle center to the periphery direction write down the ingress area of single message address and the field of radius from 25mm to 58mm that begin by the center in the outermost of the program area of record general data and program area represent that the export area that data end forms.

Generally speaking, the CD generation fracture phenomenon of record data is that the material of dealing with improperly with CD itself owing to the user is produced by amorphous high molecular polymer manufacturing.Will illustrate for the latter: amorphous material is 1/10th of the anti-anti-ability of general material at normal temperatures, owing to a little less than its anti-drag, therefore just may be damaged under the situation that continues use.The process that CD is damaged is as follows: when CD is finished by imprinting or the user when handling, phenomenon takes place to scratch in main imprinting zone, the situation that slight crack strengthens will occur according to fracture phenomenon.To be exactly the macromolecule that do not have a scar connect together with the form of chain so-called fracture phenomenon, shown in Fig. 2 b, when slight crack takes place at potential position, chain will begin fracture, especially under high speed rotating, because action of centrifugal force, they are started working by original fatigue state under static, shown in Fig. 2 b, each intermolecular distance begins to be increased to 2b drawing symbol 1e from Fig. 2 a drawing symbol d, and intermolecular adhesion just has been decomposed, slight crack has just taken place, be the intermolecular vacuum that occurred, if continuation effect under static fatigue, shown in Fig. 2 c, the chain fracture will take place, the macromolecule chain is just as being cut off by scissors, and slight crack just continues to enlarge, and the result causes the CD damage.On the other hand, drawing symbol σ from Fig. 2 a to Fig. 2 b is expressed as the size of damage, the increase of slight crack causes the further increasing that damages, therefore, the CD of imprinting is in the CD-ROM drive of high speed rotating, because production process or occur defective such as scuffing in the course of the work all fracture phenomenon can occur under action of centrifugal force.Cause spreading of slight crack,, thereby cause being stored in the loss of data on the CD, the problem of CD-ROM drive also can occur damaging so the possibility of damage CD will be very high.

Add in conjunction with present 10, the actual conditions that the generalization of the CD writer of 000rpm, 52 times of speed and digital multi-usage video disc are widely used according to the high power speedization of CD-ROM drive, prevent that fundamentally the operation of CD from having become very necessary.In 52 times of fast CD-ROM drives, if the CD breakage takes place, its fragment can fly out with the speed of maximum 66 meter per seconds, and the shell that it can puncture CD-ROM drive enters into space outerpace.Therefore, if CD slight crack and slight crack increase degree of impairment take place, user's safety has just become danger close.This is a comparatively deep problem.

Therefore industry is interior for prevent that the CD breakage from causing fragment to fly out and thickening CD comprehensively; adopt the anti-chip technology of reinforcement in conjunction with its structure; the measure of the safeguard protection of the passiveness of taking under the situation about causing but this countermeasure is damaged at CD does not fundamentally prevent the damaging problem of CD.

Though book waits Republic of Korea's publication communique of design openly to number the video disc shape record carrier of being showed for 2002-0049733 number forever earlier and has adopted the structure that begins to extend to form laterally annular teat from the medium pore position of video disc, owing to being subjected to the width at its outstanding position of space constraint and being limited to highly very much.Republic of Korea's publication communique of Piao Wuxi design openly number showed for 2001-0091302 number can prevent the structure that light-duty video disc breaks, it is between medium pore and inlead, stick the nonmagnetic metal reinforcing agent of one deck, though having, this suppresses the function that slight crack produces, but owing to the high molecular polymer and the metallic spring difference of coefficients that are widely used in the material of producing CD are very big, so just exist the overweight segregative problem of bond site load under high speed rotating.

[summary of the invention]

The present invention is as the invention that develops under the situation that has solved above problem, for the CD-ROM drive that can handle the high speed rotating CD, slight cracks such as scuffing take place in disk inner, owing to making this slight crack, action of centrifugal force strengthens, this product is exactly to have played to suppress the generation that this increase effect can also suppress the disk inner slight crack simultaneously, and can also around the CD central part, produce thermal stress, the CD breakage that this just can prevent and take place when being reduced in high speed rotating.Here it is, and we provide the purpose with the CD-ROM drive that prevents the damaged function of CD.

The present invention has possessed by the rotating disk of laying CD for achieving the above object, and drives the spindle drive motor of rotating disk and the light picker of imprinting and reading of data is formed on CD acceleration components, and it begins just to obtain the approval of driving power from the outside.For CD-ROM drive,, the heating arrangement of heating for the CD central part just has been installed at this position for the further increasing of the generation of the slight crack that reduces the middle body that is placed in the CD on the rotating disk and the slight crack that produced.We just provide the CD-ROM drive that prevents the damaged function of CD as having of feature.

In the CD-ROM drive of high speed rotating, it can make little defective aggravation problem and CD damaged phenomenon such as scuffing reach minimum.In line with keeping the important data of storing on the CD, prevent that CD is damaged and prevent the CD-ROM drive fault, the CD-ROM drive of our design that Here it is.

Here said heater means is to leave certain space on rotating disk and between the rotating disk, utilize the power drives motor to generate heat, will form thermal source, thus the heat that thermal source gave out will radiation and the central part that is transmitted to CD reach the purpose of heating.

In addition, spindle drive motor and rotating disk are made as a whole state in energising can form a magnetic field around it, just formed a fixed magnetic field, heating means are to utilize driving power to drive rotating disk, make electric wire heating formation thermal source, the heat that thermal source produces will be transmitted to the central part of CD.On the other hand, according to other field of the present invention, from the method for making of CD-ROM drive, CD-ROM drive is made of the rotating disk of laying CD, the motor etc. that drives rotating disk.For reduction is placed in the central part generation slight crack of the CD on the rotating disk or suppresses to have taken place the expansion of slight crack, we just provide the impaired method of CD in the work of preventing that heating CD central part is a feature in CD-ROM drive.

As above narration, the CD-ROM drive of the damaged function of CD is provided for your having of providing for we, not only comprise the central part generation slight crack that can reduce the CD that is placed on the CD-ROM drive rotating disk and the expansion of existing slight crack, and can be suppressed under the high speed rotating disk inner connecting portion such as the expansion trend of slight cracks such as scuffing under action of centrifugal force, can produce simultaneously and fundamentally suppress the thermal stress that slight crack produces, it can prevent and reduce the breakage of the CD under the high speed rotating.

In addition, can also fundamentally prevent and reduce the damage of CD in CD-ROM drive, preserve the data on the CD safely and improve the serviceable life of CD in high power speed CD-ROM drive, and reduce since the breakage of CD to the user bring unfavorable.

[description of drawings]

Fig. 1 is the front view (FV) of the formation of present CD.

Fig. 2 is the concept map for the explanation fracture phenomenon.

Fig. 3 is the front view (FV) that the CD formation of slight crack takes place.

Fig. 4 is the CD of key diagram 3 damage principle, the concept map that the A of Fig. 2 part is enlarged.

Fig. 5 and Fig. 6 explain the chart of finishing the result for the limited key element that the temperature difference of observing disk inner temperature and external temperature is showed the influence of slight crack.

Fig. 5 is the result of calculation chart that encircles stress value around the slight crack.

Fig. 6 is a J-integral Calculation chart as a result around the slight crack.

Fig. 7 and Fig. 8 are the formations with the CD-ROM drive that prevents CD damage function that the present invention shows according to instantiation.

Fig. 7 is a front view (FV).

Fig. 8 is the sectional drawing of the transversal VIII-VIII of Fig. 7.

The outboard profile that Fig. 9 chief component with the CD-ROM drive that prevents CD damage function that to be the present invention show according to other examples constitutes.

[embodiment]

Below with reference to accompanying drawing, the present invention is described in detail with example.

Illustrate from the present invention,, omit hereby for the specifying no longer to do and specify of function of having told about or formation.

Fig. 3 is a front view (FV) of showing the CD formation that slight crack takes place, and Fig. 4 is the concept map that the A of Fig. 2 is partly amplified demonstration for the damaged principle of key diagram 3 CDs.When CD 10 rotates in CD-ROM drive, the stress that CD 10 produces and the radius ratio of CD 10, owing to binary value is very little, so plane stress just displays, the stress that radial direction has taken place is the stress σ θ of σ r and circumferencial direction, and at this moment the stress on the circumference is called as ring stress.

Because the rotation of CD 10, centrifugal force has produced the extension stress of representing as Fig. 4 a drawing symbol 13a to the sun+value of circumferencial direction, this extension stress caused slight crack 13 to extend to this direction according to the former fracture phenomenon of narrating, thereby had produced the result who destroys CD 10.If but the central part heating of giving CD 10, will produce compression stress as the represented the moon-value on circumferencial direction of Fig. 4 b drawing symbol 13b, promptly the compression stress of Chan Shenging acts on the direction of closed slight crack 13, thereby suppress the increase of slight crack 13, therefore, the internal temperature Ti in the zone that CD 10 rotary CDs 10 inner 10a form is than the export area 11d external temperature To height of CD 10, if to its heating by the stress that centrifugal force extends of Fig. 4 a under the effect of the thermal stress of Fig. 4 b, will suppress the increase of slight crack shown in Fig. 4 c, promptly when the difference of internal temperature Ti and external temperature To is 0, under the situation of CD rotation, just had only centrifugal force, CD 10 is in no thermal stress state.When the difference of internal temperature Ti and external temperature To is the moon-value, to compare with internal environment, the temperature of external environment condition is high all the better, and thermal stress will occur with the form that prolongs stress around slight crack 13.Under the same terms, the result of calculation of the ring stress σ θ value around the slight crack 13 as shown in Figure 5, internal temperature is high more, it is many more that all stress will reduce, be that internal temperature is high more, stress on the circumferencial direction will reduce accordingly, will correspondingly reduce like this because of the expansion of slight crack 10 destruction to CD.

The slight crack effect of CD is showed its destruction factor has energy release rate and slight crack to promote power.The J-integration is exactly to use two factors of performance slight crack susceptibility to carry out quantitative comparison.The J-integration is exactly to utilize the slight crack in the certain material to enlarge as energy, preserves its point according near the network the slight crack.This is to use in the paper of RASchapery, in non-linear viscoelasticity media slight crack is realized continuity that static early stageization and slight crack the increase yardstick as the J-integration.Being that the J-integration is low more means the susceptibility of slight crack more for a short time, is preventing that CD will be very favourable aspect damaged so the CD of manufacturing with the lower material of J-integration just means.

Shown in Figure 6 as mentioned above in early days under condition and the warning condition, the influence of the susceptibility that CD 10 slight cracks 13 is enlarged for the difference of observing between internal temperature Ti and the external temperature To, we calculate with the J-integration, the possibility that is exactly the big more slight crack expansion of J-integration is just high more, internal temperature Ti is higher more than external temperature To, the J-principal value of integral is just more little, just can reduce the increase of whole slight crack 13.

The present invention can prior observed technological thought as being embodied on the CD-ROM drive, promptly when the centre of CD 10 is heated, its internal temperature Ti will be more much higher than external temperature To, so possessed the expansion that the thermal stress of the moon-value will suppress the generation of CD slight crack 13 or suppress slight crack 13.

Fig. 7 and Fig. 8 are that the present invention shows the formation displaying drawing with the CD-ROM drive that prevents the damaged function of CD according to instantiation.Fig. 7 is a front view (FV), and Fig. 8 is the sectional drawing of the transversal VIII-VIII of Fig. 7.

With drawing show identical; the present invention shows according to example to have the CD-ROM drive 100 that prevents the damaged function of CD; its principal character is to have produced foregoing thermal stress, and it comprises the casing 110 by the protection CD-ROM drive; pacifying CD 10 and making the rotating disk 140 of its rotation; prevent that CD from coming off from rotating disk 140 and be applied to the rotary type clamper 170 of CD 10 certain pressures above CD 10; the thermal wire 120 that the heat coil by producing heat energy that disposes on clamper 170 tops is formed; support the motor 150 of rotating disk 140 with the certain speed rotation; the reinforcing chassis 160 of fixed motor 150; connect the fixing shockproof base of chassis 160 and casing 110 and support chassis 111 and rubber-like; fixed underpan 160 and read formations such as device with engraving data.

Here thermal wire 120 is positioned in rotating disk 140 tops and rotating disk the top of the casing 110 of certain intervals is arranged is the upper end of the central part of CD 10, and it is the thermal wire 120 that relies on direct current that is connected on CD-ROM drive 100 and the formed power supply supply line 122,123 that is connected on thermal wire 120 two

ends

120a, 120b of heat coil that becomes direct drive power supply 121 to generate heat.The method person of being to use who confirms direct supply 121 operates according to explanation, note the CD 10 on the turntable surface 140 of being installed in of power drives, it possesses the function of sensor, under the situation of power drives, thermal wire 120 from heating, just to the central part radiations heat energy of CD 10, the central part of CD 10 has just produced the thermal stress of direction shown in legend 13b to thermal source like this.

Spindle drive motor 150 also is a supporting axis as central shaft, the stator 151 that comprises coil is arranged around supporting axis 154, the interior configuration around its outside of the certain space of the periphery of stator 151 comprises its interior loop 152 of alnico magnets 152a, connect and fixedly loop 152 be to insert the motor revolving shaft 153 of supporting axis central hollow part and the loop apparatus of control spindle drive motor 150 is a steel disc, the rotating disk 140 here generally is made of metal, for on rotating disk, laying CD 10, just be provided with by rubber slab 141, it is connected and fixed revolving shaft 153 and rotating disc 140, play the spring 142 of elastic reaction and insert the formed video disc fixed part of CD 10 inner 10a etc.

The clamper 170 is here made by plastic material.Its inside comprises alnico magnets (do not have diagram), it by and rotating disk 140 between the magnetic force that produces fix CD, at this moment the rubber slab 171 of the end of the clamper that contact with CD 10 has just been fixed CD 10 safely.

The CD-ROM drive 100 of above-described composition is when being placed in CD 10 above the rotating disk 140, CD 10 on putting into rotating disk 140 in, to suitably move down reinforcing chassis 160, at this moment shockproof basic 161 will be compressed to a certain amount of, when CD 10 is placed on the rotating disk 140, will produce magnetic force between the alnico magnets of clamper at this moment and the rotating disk, CD will be securely fixed in the rotating shaft.When CD read with record data, rotating disk, CD and clamper rotated together.

With regard to this CD-ROM drive 100, for preventing that in 52 times of speed, 10 expansion that CD 10 slight crack 13 takes place and prevents slight crack 13 under the high speed rotating of 500rpm has just been installed thermal wire 120 on the top of CD 10.Will generate heat when supplying with direct supply 121, the heat of generation will radiation be transmitted to the central part of CD 10 and have formed convective heat transfer according to the rotation of CD 10.Therefore produced and the opposite stress of stress direction that causes slight crack 13 to take place and enlarge, thereby suppressed the generation of CD 10 slight cracks 13 and the expansion of slight crack 13.

Fig. 9 promptly has the outboard profile of the critical piece formation of the CD-ROM drive that prevents the damaged function of CD as other example of the present invention.

From the explanation of this example, for the function and the formation of described this example were omitted because of repeating the spy with this example in the past.

Shown in chart, another example of the present invention is the bottom that the thermal wire 220 of CD-ROM drive 200 is placed in rotating disk 140, compares with the described CD-ROM drive 100 of top example, and the thermal efficiency that it passes to CD 10 is higher.

But because rotating disk 140 and spindle drive motor 150 rotate together, how to control thermal wire 220, we have used the commutator principle of supplying with the direct supply of motor.

Two brushes 225 promptly are installed on main base 111 under the fixing state, if contact with brush 223, lead has just obtained electric energy, and this has just formed commutating field 224, after obtaining electric energy, so just be provided with the commutating field of main motor from external dc power.As 220 power supply utilizes from the thermal source wire 220 of the lower part in the loop of rotating disk 140 and generates heat for line 222,223 from commutating field 224 to thermal source wire, comparatively speaking, it is than higher from the thermal efficiency of cd centre's conduction.More can produce the thermal stress that suppresses slight crack 13.

More than be exactly that the present invention is according to illustrating that example carries out.But it is these that limit that scope of the present invention and feature have more than, and still has the possibility that changes in application range.

Claims

1, prevent the CD-ROM drive of the damaged function of CD, by the rotating disk of laying CD, drive the main motor of rotating disk, record and the parts etc. that read information are formed on CD, its allows from the outside to obtain driving power, it is characterized in that,

For the central part generation slight crack that reduces the CD that is installed on the rotating disk or the expansion of existing slight crack, described CD-ROM drive has to CD central part heating function; Wherein, leave a fixed gap between rotating disk top and rotating disk, utilize the electric energy heating of driving power, and concentrate on the thermal wire, the heat radiation that thermal wire produces is transmitted to the central part of CD and realizes heating.

2, prevent the CD-ROM drive of the damaged function of CD, by the rotating disk of laying CD, drive the main motor of rotating disk, record and the parts etc. that read information are formed on CD, its allows from the outside to obtain driving power, it is characterized in that,

For the central part generation slight crack that reduces the CD that is installed on the rotating disk or the expansion of existing slight crack, described CD-ROM drive has to CD central part heating function, wherein, to have formed one and rotating disk by spindle drive motor be the fixed magnetic field that the loop of one and the electromagnetic field that forms on every side thereof are formed to described CD-ROM drive; The described rotating disk that is heated to be utilizes driving power to drive that the motor feels hot and formed thermal source wire, and the heat of thermal source wire is transmitted to the central authorities of CD, utilizes this characteristic to prevent the CD breakage.

3, prevent the method for CD breakage in CD-ROM drive, described CD-ROM drive is made of the rotating disk of laying CD, the main motor etc. that drives rotating disk, it is characterized in that,

The generation slight crack that is installed in the CD central part on the rotating disk for reduction is drawn and the expansion of the slight crack that taken place, heats with regard to the central part that focuses dish automatically; Wherein, leave a fixed gap between rotating disk top and rotating disk, utilize the electric energy heating of driving power, and concentrate on the thermal wire, the heat radiation that thermal wire produces is transmitted to the central part of CD and realizes heating.

4, prevent the method for CD breakage in CD-ROM drive, described CD-ROM drive is made of the rotating disk of laying CD, the main motor etc. that drives rotating disk, it is characterized in that,

The generation slight crack that is installed in the CD central part on the rotating disk for reduction is drawn and the expansion of the slight crack that taken place, heats with regard to the central part that focuses dish automatically; Wherein, to have formed one and rotating disk by spindle drive motor be the fixed magnetic field that the loop of one and the electromagnetic field that forms on every side thereof are formed to described CD-ROM drive; The described rotating disk that is heated to be utilizes driving power to drive that the motor feels hot and formed thermal source wire, and the heat of thermal source wire is transmitted to the central authorities of CD, utilizes this characteristic to prevent the CD breakage.