CN100458939C - CD driver disc carrier and switched laser diode control device and method - Google Patents
CD driver disc carrier and switched laser diode control device and method Download PDFInfo
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- CN100458939C CN100458939C CNB2007100965175A CN200710096517A CN100458939C CN 100458939 C CN100458939 C CN 100458939C CN B2007100965175 A CNB2007100965175 A CN B2007100965175A CN 200710096517 A CN200710096517 A CN 200710096517A CN 100458939 C CN100458939 C CN 100458939C
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Abstract
This invention relates to a control device for controlling carriers and switch of laser diodes including: a control chip with a first and a second control pins outputting signals separately to further form a first logic state, a second logic state, a third logic state and a fourth logic state, a carrier control circuit connected to the first and the second control pins, and carrying out a sheet- feeding operation at the first logic state and a moving back operation at the second logic state, and a CD/DVD laser diode control circuit connected to the second control pin to be converted to a DVD loop at the third logic state and a CD loop at the fourth state, which can control the carrier and CD/DVD laser diodes by two control pins of the chip to reduce the number of the pins.
Description
Technical field
The present invention relates to the control device and the method for disc carrier and switched laser diode in a kind of CD-ROM drive, relate in particular to the method and apparatus that the different pins that will control disc carrier and laser diode in the control chip of CD-ROM drive are integrated in identical pin.
Background technology
As everyone knows, CD-ROM drive can apply in the computer system with the mass data in the visit CD, perhaps applies to video-audio playing system to play video-audio data in the CD or recording voice and image information in CD.So the control chip in the CD-ROM drive must be played the part of the issue of all instructions in the CD-ROM drive and the transmission of data, comprise and the data and instruction transmission of host side (host), the control of optical read/write head, the mobile control of disc carrier (loader) etc.Therefore, control chip has very many control pins (control pin), and makes the area of control chip become big, and relatively, the cost of control chip also can increase.
Please refer to Figure 1A, it is the synoptic diagram of the control chip control disc carrier of known CD-ROM drive.When CD will be put into CD-ROM drive or take out CD by CD-ROM drive, control chip 10 must be controlled disc carrier execution carrier and withdraw from (loader-out) action, after CD placed carrier, control chip 10 must be controlled carrier execution carrier and enter (loader-in) action.Therefore, the control chip 10 of known CD-ROM drive comprises two control pins (pin1 and pin2) in order to control disc carrier.Shown in Figure 1A, the first control pin (being pin1) of control chip 10 is connected to motor drive unit 20 with the second control pin (being pin2), and motor drive unit 20 can come driving disk carrier motor 30 via signal a and signal b.And via the drive of disc carrier motor 30, the disc carrier can carry out promptly that carrier withdraws from action or carrier enters action.
Please refer to Figure 1B, it is the logic state synoptic diagram of the control chip control disc carrier of known CD-ROM drive.When the first control pin and the second control pin when exporting high level (high level) to motor drive unit 20 simultaneously, motor drive unit 20 is understood the signal a of corresponding generation low levels (low level) and signal b to disc carrier motor 30.When disc carrier motor 30 received the signal a of same voltage level and signal b, then disc carrier motor 30 can not rotate, and therefore, the disc carrier can not carried out any action, just armed state.
Moreover when the first control pin was exported high level and low level to motor drive unit 20 respectively with the second control pin, motor drive unit 20 was understood the signal a of corresponding generation high level and low level signal b to disc carrier motor 30.At this moment, disc carrier motor 30 receives voltage higher signal a and the lower signal b of voltage, makes disc carrier motor 30 for example produce rotation clockwise and makes the disc carrier carry out carrier to enter action.
Moreover when first controlled the pin and the second control pin difference output low level and high level to motor drive unit 20, the signal b of motor drive unit 20 meeting low level signal a of corresponding generation and high level was to disc carrier motor 30.At this moment, disc carrier motor 30 receives voltage higher signal b and the lower signal a of voltage, makes disc carrier motor 30 produce for example anti-clockwise rotations and make the disc carrier carry out carrier to withdraw from action.
Moreover, when first control pin when simultaneously output low level is to motor drive unit 20 with the second control pin, motor drive unit 20 can corresponding formation open a way the signal a and the signal b of (open).At this moment, disc carrier motor 30 can't receive signal a and signal b, and disc carrier motor 30 can't rotate, and therefore, the disc carrier can not carried out any action, just armed state.
Please refer to Fig. 2 A, it is the action flow chart of the control chip execution visit CD of known CD-ROM drive.Fig. 2 B is the control pin signal waveforms of the control chip of known CD-ROM drive when carrying out the action of visit CD.After the user placed the disc carrier with CD, control chip was promptly carried out carrier and is entered action (S32).Then, after the disc carrier has entered CD-ROM drive (S33), can the conduct interviews action (S34) of CD of control chip.When control chip did not finish the visit CD as yet, control chip proceeded to visit the action (S34) of CD; Otherwise when CD-ROM drive finishes the visit CD (S35), control chip can be carried out carrier and withdraw from action (S36).Then, after the disc carrier has withdrawed from CD-ROM drive (S37), the user promptly can take out CD.
Shown in Fig. 2 B, when control chip execution carrier entered action, the first control pin and the second control pin were exported high level and low level respectively; When control chip was carried out the action of visit CD, the first control pin and the second control pin be output low level all, makes that the disc carrier is an armed state; And when control chip execution carrier withdrawed from action, the first control pin and the second control pin be output low level and high level respectively.
As everyone knows, CD-ROM drive all can read CD CD and DVD CD now, therefore, in the optical read/write head in the CD-ROM drive CD laser diode that reads the CD CD and the DVD laser diode that reads the DVD discs must be arranged.In order to control the dissimilar CD of optical read/write head visit, must there be a control pin to drive CD laser diode or DVD laser diode in the control chip of CD-ROM drive in order to the control optical read/write head.
Please refer to Fig. 3 A, it is the control chip control CD/DVD laser diode circuit synoptic diagram of known CD-ROM drive.The 3rd control pin (being pin3) of control chip 10 is connected to the control end of first switch (being SW1) and second switch (being SW2), and the switch of winning can be moved according to the signal that the 3rd control pin is exported with second switch.For instance, export a high level when the 3rd control pin, first switch and second switch switch to a DVD loop, and when the 3rd control pin output low level, first switch and second switch switch to a CD loop.
As shown in Figure 3A, when the DVD loop, laser diode driver element 40 produces the drive currents DVD laser diode (being DVD LD) of flowing through, but makes DVD laser diode emission of lasering beam in order to the visit CD.Moreover, DVD detects diode (DVD monitor diode, DVD MD) can detect the laser power of DVD laser diode output and corresponding generation and detect electric current first variable resistor (being VR1) of flowing through, make the variable resistor of winning produce first voltage drop (voltage drop).And laser power control unit 50 can be adjusted the size of laser diode driver element 40 output driving currents and then realize the closed-loop control (close loop control) in DVD loop according to first voltage drop, makes the laser power of DVD laser diode output can maintain first fixed value.
In like manner, when the CD loop, laser diode driver element 40 produces the drive currents CD laser diode (being CD LD) of flowing through, but makes CD laser diode emission of lasering beam with the visit CD.Moreover CD detects diode (being CD MD) and can detect the laser power of CD laser diode output and corresponding generation and detect the electric current the second adjustable resistance (being VR2) of flowing through, and makes the second adjustable resistance produce second voltage drop.And laser power control unit 50 can be adjusted the size of laser diode driver element 40 output driving currents and then realize that the closed-loop control in CD loop makes the laser power of CD laser diode output can maintain second fixed value according to second voltage drop.
Please refer to Fig. 3 B, it is the logic state synoptic diagram of the control chip control CD/DVD laser diode of known CD-ROM drive.When the 3rd control pin was exported the control end of high level to the first switch and second switch, first switch and second switch switched to the DVD loop; Otherwise when the 3rd controlled the control end of pin output low level to the first switch and second switch, first switch and second switch switched to the CD loop.
Please refer to Fig. 4 A, it is that the control chip of known CD-ROM drive is in the action flow chart of control CD/DVD laser diode.Fig. 4 B is that the control chip of known CD-ROM drive is in the control pin signal graph of control CD/DVD laser diode.After the user inserted CD-ROM drive with CD, control chip can confirm that earlier the CD that loads is CD CD or DVD CD (S52).Confirm that when control chip the CD that loads is the CD CD, then control chip switches to CD loop (S53); Otherwise, confirm that when control chip the CD that loads is the DVD CD, then control chip switches to DVD loop (S54).Then, the CD loop or the DVD loop of control chip utilization switching visit CD CD or DVD CD (S55).When control chip did not finish the visit CD as yet, control chip proceeded to visit the action (S55) of CD; Otherwise, when CD-ROM drive finishes the visit CD (S56), can finish the visit action of CD.
Shown in Fig. 4 B, when control chip switches to the CD loop, the 3rd control pin output low level, therefore, the CD laser diode can be driven; Otherwise, when control chip switches to the DVD loop, the 3rd control pin output high level, therefore, the DVD laser diode can be driven.
As shown in the above, the control chip of known CD-ROM drive must use three control pins in order to control disc carrier and CD/DVD laser diode, its related application still has many restrictions, therefore, the different pins of controlling disc carrier and laser diode in the control chip are integrated in identical pin and then are the topmost purpose of the present invention.
Summary of the invention
The present invention proposes the control device of disc carrier and switched laser diode in a kind of CD-ROM drive, comprise: a control chip, this control chip comprise one first and one second control pin to export one first logic state, one second logic state, one the 3rd logic state and one the 4th logic state; One disc carrier control circuit be connected to this control chip this first with this second control pin, and when this first logic state, carry out a carrier to advance sheet action and carry out a carrier during in this second logic state and move back the sheet action; And a CD/DVD laser diode control circuit is connected to one of this first control pin and this second control pin of this control chip, and switches to a DVD loop and switch to a CD loop during in the 4th logic state when the 3rd logic state.
Moreover, the present invention also proposes the control method of disc carrier and switched laser diode in a kind of CD-ROM drive, comprise the following steps: to provide a control chip, wherein this control chip have one first and one second control pin can distinguish output signal and produce one first logic state, one second logic state, one the 3rd logic state and one the 4th logic state; One disc carrier control circuit is provided; One CD/DVD laser diode control circuit is provided; When forming first logic state, a disc carrier control circuit can be carried out a carrier and advance the sheet action; When forming second logic state, this disc carrier control circuit can be carried out a carrier and move back the sheet action; When forming the 3rd logic state, a CD/DVD laser diode control circuit can switch to a DVD loop; And, when forming the 4th logic state, utilize this CD/DVD laser diode control circuit to switch to a CD loop.
In order further to understand feature of the present invention and technology contents, see also following about detailed description of the present invention and accompanying drawing, yet accompanying drawing only provide with reference to and explanation, be not to be used for the present invention is limited.
Description of drawings
Figure 1A is the synoptic diagram of the control chip control disc carrier of known CD-ROM drive.
Figure 1B is the logic state synoptic diagram of the control chip control disc carrier of known CD-ROM drive.
Fig. 2 A is the action flow chart that the control chip of known CD-ROM drive is carried out the visit CD.
Fig. 2 B is the control pin signal waveforms of the control chip of known CD-ROM drive when carrying out the action of visit CD.
Fig. 3 A is the control chip control CD/DVD laser diode circuit synoptic diagram of known CD-ROM drive.
Fig. 3 B is the logic state synoptic diagram of the control chip control CD/DVD laser diode of known CD-ROM drive.
Fig. 4 A is the action flow chart of the control chip control CD/DVD laser diode of known CD-ROM drive.
Fig. 4 B is the control pin signal waveforms of the control chip control CD/DVD laser diode of known CD-ROM drive.
Fig. 5 A is the control chip control disc carrier of CD-ROM drive of the present invention and the circuit diagram of CD/DVD laser diode.
Fig. 5 B is the control chip control disc carrier of CD-ROM drive of the present invention and the logic state synoptic diagram of CD/DVD laser diode.
Fig. 6 A carries out the action flow chart of visit CD for the control chip of CD-ROM drive of the present invention.
Control pin signal waveforms when Fig. 6 B carries out the action of visiting CD for the control chip of CD-ROM drive of the present invention.
Wherein, description of reference numerals is as follows:
10 control chips, 20 motor drive units
30 disc carrier motors, 40 laser diode driver elements
50 laser power control unit, 110 control chips
120 motor drive units, 130 disc carrier motors
140 laser diode driver elements, 150 laser power control unit
Embodiment
Please refer to Fig. 5 A, it is the control chip control disc carrier of CD-ROM drive of the present invention and the circuit diagram of CD/DVD laser diode.The control chip 110 of CD-ROM drive of the present invention comprises two control pins in order to control disc carrier and CD/DVD laser diode simultaneously.Shown in Fig. 5 A, the first control pin of control chip 110 and the second control pin are connected to motor drive unit 120, and motor drive unit 120 can come driving disk carrier motor 130 via signal a and signal b.Simultaneously, the second control pin of control chip 110 is connected to the control end of first switch and second switch, and when awaiting orders, first switch and second switch can be controlled the signal that pin exports according to second and move at the disc carrier.Therefore, utilize the first control pin and the second signal cooperating difference of injection time exported of control pin, can carry out promptly that carrier withdraws from action or carrier enters action and controls the CD/DVD laser diode.
Please refer to Fig. 5 B, it is the logic state synoptic diagram that control chip is controlled disc carrier and CD/DVD laser diode in the embodiment of the invention.When the first control pin was exported high level and low level to motor drive unit 120 respectively with the second control pin, motor drive unit 120 was understood the signal a of corresponding generation high level and low level signal b to disc carrier motor 130.At this moment, disc carrier motor 130 receives voltage higher signal a and the lower signal b of voltage, makes disc carrier motor 130 for example produce rotation clockwise and makes the disc carrier carry out carrier via control to enter action.
On the other hand, when first controlled the pin and the second control pin difference output low level and high level to motor drive unit 120, the signal b of motor drive unit 120 meeting low level signal a of corresponding generation and high level was to disc carrier motor 130.At this moment, disc carrier motor 130 receives voltage higher signal b and the lower signal a of voltage, makes disc carrier motor 130 produce for example anti-clockwise rotations and makes the disc carrier carry out carrier via control to withdraw from action.
Yet when the first control pin and the second control pin when exporting high level to motor drive unit 120 simultaneously, motor drive unit 120 is understood the low level signal a of corresponding generation and signal b to disc carrier motor 130.At this moment, signal a and signal b that disc carrier motor 130 receives same voltage level can't make disc carrier motor 130 rotate, and therefore, the disc carrier can not carried out any action, just armed state.At this moment, first switch and second switch can switch to a DVD loop.And when the DVD loop, laser diode driver element 140 produces the drive currents DVD laser diode (being DVD LD) of flowing through, but makes DVD laser diode emission of lasering beam in order to the visit CD.Then, DVD detects diode (both DVD MD) and can detect the laser power of DVD laser diode output and corresponding generation and detect electric current first variable resistor (being VR1) of flowing through, and makes the variable resistor of winning produce first voltage drop.Laser power control unit 150 can be adjusted the size of laser diode driver element 140 output driving currents according to first voltage drop, and then realize the closed-loop control in DVD loop, make the laser power of DVD laser diode output can maintain first fixed value.
On the other hand, when first control pin when simultaneously output low level is to motor drive unit 120 with the second control pin, motor drive unit 120 can corresponding formation open a way the signal a and the signal b of (open).At this moment, disc carrier motor 130 can't receive signal a and signal b, and disc carrier motor 130 can't rotate, and therefore, the disc carrier can not carried out any action, just armed state.At this moment, first switch and second switch can switch to a CD loop.And when the CD loop, laser diode driver element 140 produces the drive currents CD laser diode (being CD LD) of flowing through, but makes CD laser diode emission of lasering beam in order to the visit CD.Then, CD detects diode (CD monitor diode, CD MD) and can detect the laser power of CD laser diode output and corresponding generation and detect the electric current the second adjustable resistance (being VR2) of flowing through, and makes the second adjustable resistance produce second voltage drop.Laser power control unit 150 can be adjusted the size of laser diode driver element 140 output driving currents according to second voltage drop, and then realize the closed-loop control in CD loop, make the laser power of CD laser diode output can maintain second fixed value.
According to embodiments of the invention, when control chip 110 is carried out carriers and is entered action or carrier and withdraw from action, though the signal of the second control pin output can cause the loop of first switch and second switch to switch, yet, this moment, control chip 110 did not carry out the visit action of CD as yet, therefore, laser diode driver element 140 access failure power supply and can't drive the CD/DVD laser diode still.So control the pin output level not simultaneously when the first control pin and second, the neither meeting of CD/DVD laser diode is driven, and promptly presents attonity state (being N/A).That is to say that when control chip of the present invention carried out DVD loop or CD loop, the first control pin must be exported identical level simultaneously with second control level made that the motor carrier is an armed state, otherwise motor drive unit can produce wrong action.Therefore, according to embodiments of the invention, the control end of first switch and second switch also can be connected to the first control pin of control chip 110.
Please refer to Fig. 6 A, it carries out the action flow chart of visit CD for the control chip of CD-ROM drive of the present invention.Control pin signal waveforms when Fig. 6 B carries out the action of visiting CD for the control chip of CD-ROM drive of the present invention.After the user placed the disc carrier with CD, control chip was promptly carried out carrier and is entered action (S132), and the disc carrier is loaded into CD-ROM drive (S133).Then, control chip can confirm that earlier the CD that loads is CD CD or DVD CD (S134).Confirm that when control chip the CD that loads is the CD CD, then control chip switches to CD loop (S135); Otherwise, confirm that when control chip the CD that loads is the DVD CD, then control chip switches to DVD loop (S136).Then, the CD loop or the DVD loop of control chip utilization switching visit CD CD or DVD CD (S137).Then, when control chip did not finish the visit CD as yet, control chip proceeded to visit the action (S137) of CD; Otherwise when CD-ROM drive finishes the visit CD (S138), control chip can be carried out carrier and withdraw from action (S139).After the disc carrier withdrawed from CD-ROM drive (S140), the user promptly can take out CD.
Shown in Fig. 6 B, to control pin when the first control pin and second and export high level and low level respectively, control chip is carried out carrier and is entered action; When the first control pin and second is controlled pin all during output low level, the disc carrier is that armed state and first switch and second switch switch to the CD loop, makes the CD laser diode to be driven; When the first control pin and second was controlled pin and all exported high level, the disc carrier was that armed state and first switch and second switch switch to the DVD loop, makes the DVD laser diode to be driven; And when the first control pin and second control pin difference output low level and the high level, control chip is carried out carrier and is withdrawed from action.
The output level of the above-mentioned first control pin and the second control pin and the relation between control disc carrier and the CD/DVD laser diode only are examples.That is to say, the present invention utilizes the first control pin and second control four kinds of logic states that pin produced to control disc carrier and CD/DVD laser diode, make two kinds in four kinds of logic states can be used for controlling the disc carrier, and two kinds of logic states can be used to control the CD/DVD laser diode in addition.
Therefore, the invention has the advantages that utilize control chip two control pins can control disc carrier and CD/DVD laser diode, make the control number of pins of control chip to reduce effectively, realize reducing the purpose of the manufacturing cost of control chip.
Above-described only is preferable possible embodiments of the present invention; described embodiment is not in order to limit scope of patent protection of the present invention; therefore the equivalent structure done of every utilization instructions of the present invention and accompanying drawing content changes, and in like manner all should be included in protection scope of the present invention.
Claims (12)
1. the control device of disc carrier and switched laser diode in the CD-ROM drive is characterized in that this control device comprises:
One control chip, have one first control pin and one second control pin, first second control the signal that pin exports respectively and then produce one first logic state, one second logic state, one the 3rd logic state and one the 4th logic state with this according to this;
One disc carrier control circuit is connected to this first control pin and this second control pin, and enters when this first logic state that a carrier advances the sheet state and enter a carrier during in this second logic state and move back the sheet state; And
One CD/DVD laser diode control circuit is connected to one of this first control pin and this second control pin, and enters a DVD loop state and enter a CD loop state during in the 4th logic state when the 3rd logic state.
2. the control device of disc carrier and switched laser diode in the CD-ROM drive as claimed in claim 1, it is characterized in that, this disc carrier control circuit does not enter that this carrier advances the sheet state and this carrier moves back the sheet state when the 3rd logic state and the 4th logic state.
3. the control device of disc carrier and switched laser diode is characterized in that in the CD-ROM drive as claimed in claim 1, and this disc carrier control circuit comprises:
One motor drive unit is connected to this first control pin and this second control pin; And
One disc carrier motor, be connected to this motor drive unit, and when this first logic state, make this disc carrier motor enter this carrier via the control of this motor drive unit and advance the sheet state, move back the sheet state and when this second logic state, make this disc carrier motor enter this carrier with one second sense of rotation via the control of this motor drive unit with one first sense of rotation.
4. the control device of disc carrier and switched laser diode in the CD-ROM drive as claimed in claim 1, it is characterized in that, this CD/DVD laser diode control circuit also comprises a switches set, be connected to this second control pin, and when the 3rd logic state, enter this DVD loop state and enter this CD loop state during in the 4th logic state.
5. the control device of disc carrier and switched laser diode is characterized in that in the CD-ROM drive as claimed in claim 1, and this DVD loop comprises:
One DVD laser diode receives the drive current that a laser diode driver element exports and produces a laser beam;
One DVD detects diode, connects this DVD laser diode and detects electric current with a laser power and the corresponding generation one that detects this laser beam;
One first variable resistor, this first variable resistor receive this detection electric current and produce one first voltage drop; And
One laser power control unit is adjusted this drive current according to this first voltage drop, makes this laser power of this DVD laser diode output maintain one first fixed value.
6. the control device of disc carrier and switched laser diode is characterized in that in the CD-ROM drive as claimed in claim 1, and this CD loop comprises:
One CD laser diode receives the drive current that a laser diode driver element exports and produces a laser beam;
One CD detects diode, connects this CD laser diode and detects electric current with a laser power and the corresponding generation one that detects this laser beam;
One the second adjustable resistance receives this detection electric current and produces one second voltage drop; And
One laser power control unit is adjusted this drive current according to this second voltage drop, makes this laser power of this CD laser diode output maintain one second fixed value.
7. the control method of disc carrier and switched laser diode in the CD-ROM drive is characterized in that this control method comprises the following steps:
One control chip is provided, and wherein this control chip has one first control pin and controls pin with one second, respectively output signal and produce one first logic state, one second logic state, one the 3rd logic state and one the 4th logic state;
One disc carrier control circuit is provided, is connected to this first control pin and this second control pin;
One CD/DVD laser diode control circuit is provided, is connected to one of this first control pin and this second control pin;
When forming this first logic state, this disc carrier control circuit is carried out a carrier and is advanced the sheet action;
When forming this second logic state, this disc carrier control circuit is carried out a carrier and is moved back the sheet action;
When forming the 3rd logic state, this CD/DVD laser diode control circuit switches to a DVD loop; And
When forming the 4th logic state, this CD/DVD laser diode control circuit switches to a CD loop.
8. the control method of disc carrier and switched laser diode in the CD-ROM drive as claimed in claim 7, it is characterized in that, this disc carrier control circuit is not carried out this carrier and is advanced sheet action and move back the sheet action with this carrier when the 3rd logic state and the 4th logic state.
9. the control method of disc carrier and switched laser diode is characterized in that in the CD-ROM drive as claimed in claim 7, and this disc carrier control circuit comprises:
One motor drive unit connects this first control pin and this second control pin; And
One disc carrier motor, connect this motor drive unit, and when this first logic state via the control of this motor drive unit, make this disc carrier motor carry out this carrier and advance sheet action, move back the sheet action and when this second logic state, make this disc carrier motor carry out this carrier with one second sense of rotation via the control of this motor drive unit with one first sense of rotation.
10. the control method of disc carrier and switched laser diode in the CD-ROM drive as claimed in claim 7, it is characterized in that, this CD/DVD laser diode control circuit also comprises a switches set, with this second control pin coupling, and when the 3rd logic state, switch to this DVD loop and switch to this CD loop during in the 4th logic state.
11. the control method of disc carrier and switched laser diode is characterized in that in the CD-ROM drive as claimed in claim 10, switches to this DVD loop and comprises:
Utilize a laser diode driver element to produce a drive current;
Provide a DVD laser diode to produce a laser beam to receive this drive current;
Provide a DVD to detect diode and detect electric current with a laser power and the corresponding generation one that detects this laser beam;
Provide one first variable resistor to receive this detection electric current and to produce one first voltage drop; And
Provide a laser power control unit to adjust this drive current, make this laser power of this DVD laser diode output maintain one first fixed value according to this first voltage drop.
12. the control method of disc carrier and switched laser diode is characterized in that in the CD-ROM drive as claimed in claim 10, switches to this CD loop and comprises:
Utilize a laser diode driver element to produce a drive current;
Provide a CD laser diode to produce a laser beam to receive this drive current;
Provide a CD to detect diode and detect electric current with a laser power and the corresponding generation one that detects this laser beam;
Provide a second adjustable resistance to receive this detection electric current and to produce one second voltage drop; And
Provide a laser power control unit to adjust this drive current, make this laser power of this CD laser diode output maintain one second fixed value according to this second voltage drop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100965175A CN100458939C (en) | 2007-04-11 | 2007-04-11 | CD driver disc carrier and switched laser diode control device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100965175A CN100458939C (en) | 2007-04-11 | 2007-04-11 | CD driver disc carrier and switched laser diode control device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101025957A CN101025957A (en) | 2007-08-29 |
| CN100458939C true CN100458939C (en) | 2009-02-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100965175A Expired - Fee Related CN100458939C (en) | 2007-04-11 | 2007-04-11 | CD driver disc carrier and switched laser diode control device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100458939C (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020080700A1 (en) * | 1997-05-30 | 2002-06-27 | Katsuya Watanabe | Optical disk apparatus |
| JP2005071508A (en) * | 2003-08-26 | 2005-03-17 | Ricoh Co Ltd | Optical disk device |
| CN1705020A (en) * | 2004-05-26 | 2005-12-07 | 联发科技股份有限公司 | Automatic CD driver loader recording and reconnecting method |
-
2007
- 2007-04-11 CN CNB2007100965175A patent/CN100458939C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020080700A1 (en) * | 1997-05-30 | 2002-06-27 | Katsuya Watanabe | Optical disk apparatus |
| JP2005071508A (en) * | 2003-08-26 | 2005-03-17 | Ricoh Co Ltd | Optical disk device |
| CN1705020A (en) * | 2004-05-26 | 2005-12-07 | 联发科技股份有限公司 | Automatic CD driver loader recording and reconnecting method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101025957A (en) | 2007-08-29 |
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