CN2499947Y

CN2499947Y - Automatic balance device for optical drive

Info

Publication number: CN2499947Y
Application number: CN 01232790
Authority: CN
Inventors: 廖正尧; 陈子南
Original assignee: Lite On IT Corp
Current assignee: Lite On IT Corp
Priority date: 2001-08-06
Filing date: 2001-08-06
Publication date: 2002-07-10
Anticipated expiration: 2011-08-06

Abstract

The utility model relates to a CD driver automatic balance device, which is mainly characterized in that a plurality of holding structures with radial movement are added on the circle of a rotator which bears balance mass, the holding structures are connected with a shaft or a rotator of a spindle motor via elastomers, due to the function of elasticity, the holding structures can fix the position of the balance mass when the spindle motor is still; at high rotating speed, the connecting force of the holding structures is smaller than the centrifugal force which the holding structures bear, the balance mass can move freely and accomplish the balance function of the automatic balance device; at low rotating speed, a servo system first drives the spindle motor to rotate at a speed larger than a critical speed to accomplish the balance activity, then the rotating speed is reduced to make the connecting force of the holding structures larger than the centrifugal force which the holding structures bear, and the balance mass is locked at the balance position, allowing the automatic balance device to have a balance effect in the low rotating speed range. Reducing the vibration caused by the unbalance value of discs during the running of CD driver in an effective, stable and reliable way, the target of speedy and accurate reading or writing and stable running is obtained.

Description

The CD-ROM drive automatic balancing arrangement

Technical field

The utility model is a kind of CD-ROM drive automatic balancing arrangement, especially refer to a kind of at the storage facilities demand that can override type, a kind of new CD-ROM drive automatic balancing arrangement design is proposed, when reducing operating of optical drive in effective and reliable and stable mode, because of the vibration that the disc unbalance amount is caused, reach the target that correctly reads or write data and smooth-going running at a high speed.

Background technology

As everyone knows, along with the progress of optical information access medium technique, the reading speed that is applied to the CD-ROM drive (optical diskdri ve) of computing machine periphery (computerperipheral) also presents development fast.Even to this day, Spindle Motor (spindle motor) rotating speed surpasses 10,000 to be changeed (10,000RPM) Yi Shang CD-ROM drive (CD-ROM) oneself gradually become main product on the market.

When Spindle Motor during with high rotation speed operation, the centrifugal beat power because of the disc unbalance amount is produced also increases thereupon, and causes problems such as vibration and noise.

In the CD-ROM drive practical application, excessive vibratory output can cause optical head to read the instability of sheet ability, makes CD-ROM drive can't maintain maximum speed and reads data.In addition, with regard to the CD-ROM drive user, the noise when CD-ROM drive runs up also causes discomfort and the puzzlement in the use.

Therefore, how effectively suppress vibration, can be to guarantee CD-ROM drive in the smooth-going and accurate data that reads on the discs of high power speed, be all CD player manufacturers one of the difficulty that must overcome.

Traditionally, CD-ROM drive manufacturing plant has three kinds for the method for oscillating that the reduction CD-ROM drive is caused because of the disc unbalance amount when running up:

(1) directly increases the weight of reading mechanism to lower vibration;

(2) the dynamic vibration insulating system of using on the theory of oscillation (dynamic absorber) comes vibration damping;

(3) come vibration damping with automatic-balancing system (auto-balancing system).

Above three kinds of methods narrating all can reduce the CD-ROM drive vibratory output, but in theory with the best results of automatic-balancing system.Because of it is to utilize the mode that adds balance mass, directly lower the strength that excites of vibration.

As Fig. 1-shown in Figure 2, automatic-balancing system for the general use of CD-ROM drive manufacturing plant now, (or below) adds an automatic balancing arrangement 11a above Spindle Motor 10a, and its structure comprises: balance mass (being generally a certain number of steel ball) 12a and the rotary body 13a (housing) (being generally circular) in order to carry balance mass 12a.Use the theory of rotating machinery (rotor dynamics): when Spindle Motor 10a rotational speed is higher than critical velocity (critical speed), the extra position that adds quality can be in the anti-phase position of the uneven vector of former disc 14a, therefore, video disc 14a amount of unbalance can be offset, and the CD-ROM drive vibratory output also decreases.

With regard to practical application, the balance mass of automatic balancing arrangement must be on critical rotary speed, just can move to the anti-phase position of former disc unbalance vector, this specific character is for read-only type CD-ROM drive, because of the mostly running (generally speaking all more than 6000RPM) under quite high rotating speed of its Spindle Motor, so balance mass all can move to desirable position.

But, for can overriding the CD-ROM drive of type, the condition when its Spindle Motor is carried out write activity because of it as: the influence of discs or laser power etc., its rotating speed might be reduced to 200～500RPM.Under slow-revving situation, balance mass can be in the rolling condition of rather unstable, not only lose the function that it offsets amount of unbalance, more produce different sound or cause disturbance, make servo-drive system can't stablize the control motor rotary speed the Spindle Motor load because of its rolling.Because above-mentioned situation makes traditional automatic balancing arrangement can't be applied on the CD-ROM drive of the type that can override.

Summary of the invention

Improving of the above-mentioned disappearance of inventor's thoughts, the spy concentrates on studies and cooperates the utilization of scientific principle, proposes a kind of reasonable in design and effectively improve the technical solution of the utility model of above-mentioned disappearance finally.

Fundamental purpose of the present utility model provides a kind of CD-ROM drive automatic balancing arrangement, the application that makes traditional automatic balancing arrangement is by read-only type storage facilities, extend to and to override the type storage facilities, as CD-R/RW, DVD-R/RW and DVD-RAM etc., the storage facilities that reaches the type that can override can read data at a high speed, also can carry out the write activity purpose under low-speed running simultaneously.

The purpose of this utility model is achieved in that a kind of CD-ROM drive automatic balancing arrangement, include balance mass, carry the rotary body and the clamp structure of this balance mass, it is characterized in that: this clamp structure is to utilize elastic body to link in the Spindle Motor rotating shaft or on the rotary body.

This rotary body circumference is provided with the fluting that passes for this clamp structure.

Further specify below in conjunction with preferred embodiment and accompanying drawing.

Description of drawings

Fig. 1 is the schematic top plan view of traditional automatic balancing arrangement.

Fig. 2 is the combination cross-sectional schematic of traditional automatic balancing arrangement.

Fig. 3 is a schematic top plan view of the present utility model.

Fig. 4 is a combination cross-sectional schematic of the present utility model.

Fig. 5 is the schematic top plan view of another state of the utility model.

Fig. 6 is the combination cross-sectional schematic of another state of the utility model.

Fig. 7 is the combination cross-sectional schematic of another embodiment of the utility model.

Embodiment

Embodiment 1

Consult Fig. 3-Fig. 6, the utility model provides a kind of CD-ROM drive automatic balancing arrangement, the general automatic balancing arrangement that uses is provided in a side of Spindle Motor 10 tops (or below), its structure comprises the rotary bodies 11 that can rotate synchronously with this Spindle Motor 10, these rotary body 11 rounded bodies, it is the circuit orbit 12 in the center of circle that this rotary body 11 is provided with the turning axle of this rotary body 11, this track 12 is to be a toroidal cavity shape, in this track 12, be provided with at least one balance mass (steel ball) 13 in addition, to constitute an automatic balancing arrangement.

The utility model mainly is to add most the clamp structures 20 that can move radially on the circumference of the rotary body 11 of carrying balance mass 13, and this clamp structure 20 is to utilize elastic body (as spring) 21 to link to the rotating shaft 14 of Spindle Motor 10.When this Spindle Motor 10 was static, this clamp structure 20 can pass the fluting 22 that suitably is provided with on rotary body 11 circumference because of the effect of elastic body 21 elastic force, and balance mass 13 is clamped, and with the position of stable equilibrium quality 13, it can't freely be rolled.The clamping of 20 pairs of balance masses 13 of this clamp structure and release are when rotating via elastic force and Spindle Motor 10, and the centrifugal force size that this clamp structure 20 is born is controlled.

When discs is inserted CD-ROM drive, after Spindle Motor 10 entrys into service, clamp structure 20 can be subjected to action of centrifugal force and offset the connection strength of elastic body 21.Via suitable design, can make this connect the centrifugal force that strength is born before critical rotary speed less than clamp structure 20.So, balance mass 13 will be thrown away energy free movement (as Fig. 5 and Fig. 6) by centrifugal force because of clamp structure 20, move to the equilibrium position in continuing the process of quickening.

Embodiment 2

Consult Fig. 7, in the present embodiment, this clamp structure 20 is to utilize elastic body (as spring) 21 to link on the rotary body 11, and other structures are identical with embodiment 1, so do not repeat.

Above-mentioned action reaches the function of balance promptly as traditional automatic balancing arrangement in the system that runs up.

When CD-ROM drive must be carried out the action that low speed writes, or when needing low velocity to turn round, can adopt following dual mode to use automatic balancing arrangement of the present utility model because of the discs bad:

(1) directly CD-ROM drive is driven under the subcritical rotating speed.This moment is not high because of rotating speed, and amount of unbalance can not counteract read-write motion, and the while is made because of balance mass 13 is held structure 20, can't freely roll, and therefore can not produce the phenomenon that different sound or rotary speed unstabilization cause writing difficulty surely.

(2) when servo-drive system is judged the palpus low-speed running, drive Spindle Motor 10 earlier and be higher than critical rotary speed, so balance mass 13 can move to desirable equilibrium position.And then with the reduction of Spindle Motor 10 rotating speeds, behind the subcritical rotating speed, clamp structure 20 connects strength greater than the centrifugal force that it bore, and balance mass 13 can be held structure 20 lockings and can't move freely.This moment, balance mass 13 positions were to be on the desirable equilibrium position, so the vibration meeting of its running is less, can't freely roll because of balance mass 13 is held structure 20 restrictions simultaneously, therefore can not produce the phenomenon that different sound of rolling or rotary speed unstabilization cause writing or reading difficulty surely.

In sum, the utility model can make the application range of speeds of automatic-balancing system contain can override the speed that the type CD-ROM drive may turn round, overcome traditional automatic balancing arrangement technology limitation, make the data that reads that the CD-ROM drive of the type that can override can high-speed smooth, the action that also can reliable and stable execution writes, be a rare novel product in fact, have usability on the industry, novelty and creativeness.

The above only is preferred embodiment of the present utility model, non-so promptly inflexible limit protection domain of the present utility model, and the equivalent structure that all utilization the utility model instructionss and graphic content are done changes, and all is contained within the protection domain of the present utility model.

Claims

1, a kind of CD-ROM drive automatic balancing arrangement includes balance mass, carries the rotary body and the clamp structure of this balance mass, it is characterized in that: this clamp structure is to link in the Spindle Motor rotating shaft or on the rotary body by elastic body.

2, CD-ROM drive automatic balancing arrangement according to claim 1 is characterized in that: this rotary body circumference is provided with the fluting that passes for this clamp structure.