(5) embodiment
The invention provides a kind of too high method of its optical head temperature of CD-ROM device/CD writers that prevents, put the regulation and control assembly by in CD-ROM device/CD writers storer, building, and at optical head installing Temperature Detector, the working temperature of sustainable detection optical head, and when its temperature is too high, automatically control is servo is that system reduces read/write speed, and working temperature is reduced.
Please refer to Fig. 1, this figure shows according to the CD-ROM device structure 10 that can detect and adjust temperature automatically provided by the present invention.This CD-ROM device structure 10 has comprised central processing unit 12, storer 14, pre-amplifier 16 and servo-drive system 18.Wherein, central processing unit 12 can be in response to the signal of computer system, and 18 pairs of CD-RW discsCD-RW of Control Servo System read or the action of burning.As for CD-ROM device storer 14, then can constitute by elements such as flash memory or ROM (read-only memory), be used for the required instruction of store operation CD-ROM device, parameter and program.Like this, central processing unit 12 can read and carry out these instructions, parameter and program by storer 14, and operational servo 18 carries out the action of access laser disc.In addition, have pre-amplifier (pre-amplifier) 16, except having the signal gain function, and can carry out the conversion of analog/digital in servo-drive system 18 and 12 of central processing units.
Servo-drive system 18 can be according to its function and structure and is divided into driving circuit 20, servo motor 22 and optical read/write head 24.Servo motor 22 comprises the Spindle Motor (spindlemotor) that is used for driving the CD-RW discsCD-RW rotation and is used for controlling the drive motor (sled motor) and voice coil motor (voice coil motor) that optical read/write head 24 moves.Wherein, drive motor portability optical read/write head 24 and move along the planar horizontal of CD-RW discsCD-RW; Voice coil motor then is used to adjust the upright position of optical read/write head 24, so that light focuses on the CD-RW discsCD-RW accurately.
It should be noted that in order to detect the operating temperature of CD-ROM device, in optical read/write head 24, installed a Temperature Detector 26 additional, so that carry out the detection of temperature according to the control signal of central processing unit 12.In addition, in optical disc storage 14, has a regulation and control assembly 28.This regulation and control assembly 28 is made of relevant procedure code, carries out the test of temperature to provide central processing unit 12 to carry out and control said temperature detecting device 26.When temperature surpassed the maximum start-up temperature of optical read/write head 24, then central processing unit 12 can begin to reduce servo-drive system 18 and reads/speed of burning, produces to reduce thermal source, and then reaches the effect that reduces temperature.SF-W04 optical head with Sanyo's manufacturing is an example, and the working temperature when reading owing to it is the maximal value that can be set at operating temperature range with the maximum start-up temperature that reads action about between 0 ~ 65 degree Celsius, 65 degree promptly Celsius.In addition, the burning working temperature of this optical head is about between 0 ~ 60 degree Celsius, and the maximum start-up temperature when carrying out the burning action can be set at 60 degree Celsius like this.In addition, what specify is, above-mentioned regulation and control assembly 28 is stored in the CD-ROM device storer 14 except mode that can procedure code, also can select it is established in central processing unit 12 or the pre-amplifier 16, and finish by the mode of hardware construction.
In preferred embodiment, above-mentioned regulation and control assembly 28 comprises whole two parts of function of temperature detecting function and times velocity modulation.Wherein, temperature detecting function can combine with original monitoring facilities in the storer 14 (monitor code).Typical monitoring facilities can be according to initial setting, and with the interval of tens of approximately microseconds, continues optical read/write head 24, servo motor 22, monitors with driving circuit 20, and the information of being correlated with is sent back central processing unit 12.Like this, temperature detecting function is incorporated in original monitoring facilities, just can when monitoring facilities is each time monitored action, obtains required temperature data via the Temperature Detector 26 that is arranged in optical read/write head 24 simultaneously.When the temperature that detects surpassed above-mentioned maximum start-up temperature, central processing unit 12 just can be according to the whole function of times velocity modulation, and Control Servo System 18 reduces and reads/speed of burning.
In order to make CD-ROM device can in the scope that temperature is allowed, keep the read-write usefulness of high power speed, except above-mentioned reduction read/mechanism of replication rate, in regulation and control assembly 28, set a temperature range according to maximum start-up temperature.When the temperature that detects cut the value of this temperature range less than maximum start-up temperature, central processing unit 12 can Control Servo System 18 improves and reads/action of replication rate.In general, this temperature range can be set between 5 ~ 10 ℃.For example, when temperature range is set at 5 ℃ and maximum start-up temperature and is 65 ℃, then as above-mentioned when the temperature that detects surpasses 65 ℃, the speed that regulation and control assembly 28 just can allow CD-ROM device read reduces, so that reduce power output and reach the purpose that reduces temperature; Otherwise, when the temperature that detects is lower than 60 ℃, then regulates and control assembly 28 and can allow the reading speed of CD-ROM device rise, so that it keeps preferable work efficiency.
Then, please refer to Fig. 2, this figure has shown the situation of using regulation and control assembly 28 adjustment CD-ROM device reading speeds.As aforementioned, because the temperature detecting function of regulation and control assembly 28 is to depend on monitoring facilities and carry out.Therefore, at first execution interval be 20 microseconds read monitoring facilities (step 30), that is every mistake 20 microseconds are just once monitored action to CD-ROM device.Then, whether the detection delay of inspection detected temperatures function is 0 minor tick (step 32).Between postponing, detection when number of times is 0 time, just can in ensuing monitoring facilities, carry out temperature detection simultaneously.Otherwise, when detection postpones not to be 0 time, then after each monitoring facilities action finishes, detect between the delay and can subtract 1 (step 33) every number of times, become up to detecting between the delay at 0 o'clock every number of times, just can be in the monitoring action of next time carrying out, while detected temperatures value.
After measuring the working temperature of optical head, relatively whether it is higher than maximum start-up temperature (step 34).If it surpasses maximum start-up temperature, then check the whether i.e. reading speed (step 36) set originally of CD-ROM device for this reason of present reading speed.When present reading speed is lower than the speed that CD-ROM device sets originally, judge the temperature that detected whether less than the value (step 38) of maximum start-up temperature (Tmax) deduction first temperature range (T1) back, that is whether the inspection detected temperatures is less than (Tmax-T1).If, then regulate and control times speed control system function of assembly 28, can make the reading speed of CD-ROM device rise (step 40).In preferred embodiment, when employed optical head has 0 ~ 65 ℃ working temperature, maximum start-up temperature Tmax can be made as 65 ℃, and temperature range T1 is set between 5 ~ 10 ℃.
In general, because CD-ROM device variation of temperature, can't after the reading speed of adjusting optical head, manifest at once, therefore increase too fastly or too much for fear of reading speed, after increasing reading speed at every turn, can postpone a period of time, carry out the detection of temperature again, so that can more accurate grasp under different reading speeds, the temperature variation situation of optical head.Therefore, after increasing the reading speed of CD-ROM device, the detection of detected temperatures function can be postponed to be set at 200 minor ticks (step 42), so that when the 200th time follow-up monitoring of monitoring facilities moved, carry out the detection of temperature next time again.Subsequently, continue to carry out monitoring facilities (step 44).With between the above-mentioned monitoring facilities every being set at 20 microseconds, after time, just can carry out the detection of temperature once again through (20 microsecond) * (200 minor tick).That is, after the time in about 4 seconds, just can carry out temperature detection next time.
As for, in the judgement of above-mentioned steps 34,, judge that then present reading speed is whether still greater than the minimum reading speed (step 46) of CD-ROM device if the working temperature of optical head has surpassed maximum start-up temperature.If then obviously CD-ROM device still has and reduces the doubly space of speed, therefore can be on screen display message informing the user, and send a signal to the relative application software (step 48) of using CD-ROM device in the computer system by central processing unit 12.Then, can will read the low twice (2X) (step 50) of times prompt drop, and the detection of detected temperatures function is postponed to be set at 200 minor ticks (step 52), carry out the time of temperature detection to determine next time.
Otherwise, when the judgement display light disc player of above-mentioned steps 46 has not had the space that reduces speed doubly, then equally on screen display message and transmit signal and just give relative application software (step 54) informing the user at the operational light disc player.Then, stop the fetch program (step 56) of optical head, and close the everything (step 58) of servo-drive system, so that reduce the temperature of optical head.Be lower than the value (step 60) of above-mentioned maximum start-up temperature (Tmax) deduction second temperature range (T2) back up to the temperature of subsequent detection, that is be lower than the value of (Tmax-T2), restart the action of servo-drive system again, and the related setting (step 62) before recovering, then carry out reading and convey program (step 64) of data again.As aforementioned, maximum start-up temperature Tmax herein is set at 65 ℃, and temperature range T2 then can be set between 1 ~ 5 ℃, to recover the work of reading of CD-ROM device as early as possible.
Then, please refer to Fig. 3, this figure has shown that using the present invention regulates and control the situation that assembly 28 is adjusted the CD writers writing speed.Similar to situation about reading, at first execution interval is the burning monitoring facilities (step 70) of 20 microseconds, that is just carries out condition monitoring one time every 20 microseconds.Then, check whether detection postpones is 0 minor tick (step 72).When detection postpones to be 0 minor tick, just in time monitoring facilities, carrying out temperature detection simultaneously at once.Otherwise, when detect postponing not to be 0 time, then after each monitoring facilities action finishes, will detect and subtract 1 (step 73) every number of times between postponing, when detecting delay and be 0 minor tick, just carry out temperature detection.
After measuring the temperature of optical head, relatively whether it is higher than maximum start-up temperature (Tmax) (step 74).If it does not surpass maximum start-up temperature (Tmax), check then whether present replication rate is the original doubly speed value of setting (step 76).With Sanyo's manufacturing SF-W04 optical head is example, and its temperature of carrying out burning work is about 0 ~ 60 ℃, maximum start-up temperature (Tmax) can be made as 60 ℃ like this.When present replication rate is lower than the doubly speed of setting originally, whether checks the temperature that is detected less than the value (step 78) after maximum start-up temperature (Tmax) deduction first temperature range (T1), that is check that whether detected temperatures is less than (Tmax-T1).If, then regulating and control times speed control system function of assembly 28, can stop the write activity (step 79) of optical head earlier and adjust replication rate making its rising (step 80).In preferred embodiment, temperature range T1 herein can be set between 5 ~ 10 ℃.
Increase CD writers write times speed after, the preceding terminating point (step 82) that writes that can return again, and link the data (step 84) that are positioned at the memorizer buffer section again restarts to carry out the action (step 86) of burning again.Equally, after increasing the writing speed of CD writers, the detection of detected temperatures function can be postponed be set at 200 minor ticks (step 88), so that after the time delay of (20 microsecond) * (200 minor tick), depend on the detection that monitoring facilities carries out temperature again.Then, continue to carry out monitoring facilities (step 90).
As for, in the judgement of above-mentioned steps 74,, judge that then present replication rate is whether still greater than the minimum writing speed (step 92) of CD writers if the working temperature of optical head has surpassed maximum start-up temperature.If then display message and sends a signal to the relative application software (step 94) of using CD writers informing the user on screen.Then, stop the write activity (step 96) of optical head and adjust replication rate and make its decline (step 98) earlier.Generally speaking, can select the low 2X ~ 6X of burning times prompt drop for example when original times of speed of CD writers is 48, can be downgraded downwards according to the mode of 48X → 40X → 32X → 24X → 20X → 16X → 12X → 10X → 8X → 6X → 4X → 2X → 1X.Downgrade write times speed after, write terminating point (step 100) before can returning again, and link the data (step 102) that are positioned at the memorizer buffer section again, restart to carry out the action (step 104) of burning again.Equally, after downgrading the writing speed of CD writers, the detection of detected temperatures function can be postponed to be set at 200 minor ticks (step 106), and continue the continuous monitoring facilities (step 90) of carrying out.
Otherwise, reduced to minimum burning doubly (for example 1X) during speed when the judgement of above-mentioned steps 92 shows, then equally on screen display message and transmit signal and give the relative application software (step 108) of operating CD writers informing the user.Then, stop the burning program (step 110) of optical head, and close the everything (step 112) of servo-drive system, so that reduce the temperature of optical head.Temperature up to subsequent detection has been lower than the value (step 114) that above-mentioned maximum start-up temperature (Tmax) is deducted second temperature range (T2) back, restarts the action of servo-drive system again and recovers related setting (step 116) before.Write terminating point (step 118) before then returning, and link the data (step 120) that are positioned at the memorizer buffer section again, restart to carry out the action (step 122) of burning again.Herein, maximum start-up temperature Tmax is set at 60 ℃, and the second temperature range T2 then is set between 1 ~ 5 ℃, to recover the work that writes of CD writers as early as possible.
Compared to conventional art, the present invention has considerable advantage:
(1) owing to need on CD-ROM device/CD writers, not install radiator fan among the present invention, can reduce production costs significantly like this, can reduce the power consumption of CD-ROM device/CD writers simultaneously.
(2) because can be among the present invention by the regulation and control assembly that is stored in CD-ROM device/CD writers storer, the temperature of detection optical head automatically, and carry out the doubly adjustment of speed of read/write according to this, can avoid optical head in excessive temperature work down like this, and the purpose that reaches increase CD-ROM device/CD writers degree of stability and prolong its life-span.
Certainly, those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the modification of the above embodiment.