TW504675B - Laser energy compensation method of CD-ROM drive - Google Patents

Abstract

A laser energy compensation method of CD-ROM drive is used to correct the run-out elimination of light source energy for laser light source of the CD-ROM drive. In the invention, several kinds of different laser light emission parameters are first used to perform the operation of writing signals in the data write mode of the CD-ROM drive, and the corresponding signals reflected by these several kinds of laser light emission parameters are read from the data read mode of the CD-ROM drive. Then, by using the bottom curve-fitting manner, these corresponding signals are sampled, and data of the adjacent points are compared so as to extract its corresponding slope data. By repeating the steps stated above several times, it is capable of obtaining an optimized laser light emission parameter with the maximum value of greatest, where the run-out factor is completely eliminated. The maximum laser light emission value is written into the laser light emission control system of the CD-ROM drive so as to make the laser light source energy have the optimized compensation and control.

Description

V. Description of the invention (< Invention field >) The present invention relates to a method for compensating the laser energy of an optical disc drive, especially ---------- install-(read the precautions on the back before filling (Page) Refers to a method for adjusting the laser light source energy of an optical disc drive and optimizing the compensation control of the light source energy. ≪ Background of the Invention and Previous Techniques > Press' Optical disc drive is widely used in daily life audio-visual, audio-visual Among the equipment and computer information equipment, it is used as the main equipment for reading and playing data on the disc and computer data. However, the components used by the factory to read or write = shell materials should be used to emit light. Laser components, such as the conventional readable / writable (CDR / W) optical disc drive, the intensity of the light source emitted by the laser element will determine the quality of the data read or write by the optical disc drive, so there are parameters about the light emission of the laser element The adjustment of the energy of the light source is relatively important. In contrast, it is printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. However, the direct electric power value of the laser light emission of the conventional optical disc drive is in milliwatts ( mw) to represent its value The size, that is, the output redundancy or output parameter is expressed in terms of power units, and the luminous parameters of the entire laser element are expressed in milliwatts / amps (MW / A) as the relative relationship between the output and the input. The value is usually regarded as a voltage value. Under normal conditions, the energy (brightness) of the radioactive light source is constant and proportional to the value of the light emission parameter value, that is, the light is emitted without any disturbance (RUN-OUT). The larger the parameter value, the greater the energy of the laser light source it emits. But in fact, the operation of the electro-optical components in the optical disc drive is not as ideal as mentioned above, as shown in the seventh figure ' It is the energy distribution of the conventional laser light source of the optical disc drive. Since the laser element X and the optical disc drive are ______ 2 __ This paper size is applicable to the Chinese National Standard (CNS) A viewing grid (210x297 mm> A7 ^ --- --B7 V. Explanation of the invention () The combination relationship between the lens y is not completely non-existent, for example: the disturbance of the focus shift caused by the gradation shift of the lens y, or because of the optical disc drive Assembled between the spindle motor and the optical disc The back-moving factor will directly affect the intensity of the light source emitted by the laser element x, and the shift factor of the lens γ will account for the vast majority. As shown in the sixth figure, the reflection points A1, A2, and A3 are formed. The state of the energy source energy deviation of the light source, it can be seen that the light source intensity of the reflection point A2 is greater than the reflection points A1 and A3. If it is expressed by the function yttrium, the light emission parameter Pw = f (p, offset), It is also a function containing the disturbance factors of the lens Y assembly offset. And the eighth figure further reveals the graph of the relative energy loss of the laser light source caused by the lens γ assembly offset. Among them, it can be clearly seen that regardless of It can be clearly seen from the curves of the lens curve PΗ0, the luminous parameter curve RRF, the light source feedback curve BHO, and the power turn-in curve pLT that the energy loss at the reflection point A2 in the sixth figure is the smallest, and the reflection points A1 and A3 are 旎ϊ is relatively large, in other words, the light source energy (焭) of the reflection point A2 is large, but it does not mean that the input light parameter pw is the largest, and in the ninth, tenth, Figures 11 and 12 are divided The waveform of the light source feedback curve BH0, the power input curve PLT, the light emission parameter curve RRF, and the input power FPDO of the laser element X can be corroborated, that is, the energy intensity of the light source at the reflection points Al, A2 and A3 will be Perceived the perturbation factor of the assembly deviation of the lens γ, which caused the perturbation change of the power parameter PW and the energy of the light source, but could not directly find the power parameter PW of the optimal light source energy point, causing the optical disc drive to write or read data Time error or insufficient light source energy, causing data writing to fail or pick ^ i? TcNS) 7 ^ iTJ ^^-J * m nn f-, * = I- I ........... ........------- 11 -------- III ml am I (please read the precautions on the back before filling in page m) Cooperatives printed the Intellectual Property Bureau of the Ministry of Economic Affairs, the consumer co-operatives printed the invention description (films, etc.). In addition, in the conventional optical disc drive industry, a large number of manual methods are being used to detect and adjust, which not only consumes man-hours and manpower, but also uses the economic benefits of artificial production. Fu products are born…, the adjustment is entirely based on the professional not equal to the phase of the lens of each optical disc drive ~ installation situation ^: "Marriage, can not make all products can be accurately adjusted to The state of measuring the amount of rotation, the quality of the product is not uniform, which seriously affects the nature and quality of the optical disc drive product. 〈Objective of the invention〉 The main purpose of the month is to provide _ kinds of supplementary laser energy The detective AT accurately outputs the maximum energy value of the laser light source and its relative light emission parameters, which eliminates the lens assembly disturbance factors, so that the laser element can exert the best light emission energy when writing or reading data. One purpose is to provide a method for supplementing the laser energy of the optical disc drive, which can automatically find the best luminous parameters of the luminous energy under any different lens assembly offset disturbance factors, and it is applicable to all Another object of the present invention is to provide a method for compensating the laser energy of an optical disc drive, which can automatically and accurately find the optimized light emission parameters of the laser light emitting energy, which can greatly save the production line adjustment and Manpower and cost of testing. The following is to make your review members have a better understanding of the detailed technical content and application status of the present invention. Below is a preferred embodiment, which will be described with the accompanying drawings. Among them: Please first -I · Meaning of the first intention and refilling m pages. The paper size is applicable to China National Standard (CNS) A4 (210X297 mm) 67 04 5% Printed by A7 _... ... 一 _B7 ___ V. Description of the invention () Brief description of the drawings: The first diagram is a flowchart of the method of the invention; the second diagram is the light source energy and The relationship diagram between the luminous parameters; the third diagram is the initial sampling diagram of bottom curve fit in the present invention; the fourth diagram is the diagram of the minimum square positioning process of the present invention; The fifth figure is a graph of the final processing result of the bottom curve fit of the present invention; the sixth figure is a preferred application example of the method of the present invention; the seventh figure is between the conventional laser element and the lens of the optical disc drive The relationship between the energy of the laser light source and the luminous parameters; Figure 8 is a graph of the energy parameters of various light sources of the conventional optical disc drive laser components due to lens assembly offset; Figure 9 is the light source feedback of the conventional optical disc drive laser components The waveform diagram of curve BHO; the tenth diagram is a waveform diagram of the conventional optical disc drive laser writing curve PLT; the eleventh diagram is the waveform diagram of the conventional optical disc drive laser element emission parameter curve RRF; the twelfth diagram is The waveform diagram of the input power FPDO of the conventional optical disc drive laser component; Figure No. Explanation: 1. Creative part ----------- installation— (please read the precautions on the back before filling in page m)

1T silk This paper size is applicable to Chinese National Standard (CNS) A4 specification (210X297 mm) 504675 Burn i A7 B7 V. Description of invention ()

10 Luminous parameter controller 20 Laser power controller 30 Laser element 40 Pick-up element 50 Parameter feedback element 60 First sensing unit 70 Second sensing unit 80 Compensator 100 Input multiple (η) different light emitting parameters PW ----------- Installation-- (Please read the precautions on the back before filling in the page) 1005 Power control system 110 Read back the feedback signal Si ~ Sn 120 relative to the light emission parameter PWi ~ PWn 120 feedback signal S1 ~ Sn performs bottom curve fit initial sampling calculation 130 minimum squares fit calculation 140 repetition steps 100 to 130 150 to obtain the final best light emission parameters 160 parameters written to the laser power control system of the optical disc drive BHO light source feedback curve BHO "number of light source feedback

Fit Positioning PLT Power Input Curve PLT ”Power input parameters PW Luminous parameters PW! ~ PWn Luminous parameters 6 This paper size is applicable to China National Standard (CNS) A4 specifications (210X297 mm) Order printed by the Ministry of Economic Affairs Intellectual Property Bureau employee consumer cooperatives 5 Congratulations !: Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs Κ Α7 ~ ...—— 一 J_ ^ B7_ V. Description of the invention () RRF (I) Luminescence function RRF5 (I) Luminescence function RRF (a) Function point RRF ' (a) Function point RRF (b) Function point RRF (c) Function point RRF '(c) Function point Si ~ Sn Feedback signal V Error matrix V (I) Error function II. Known part A1 ~ A3 Reflection point BHO light source feedback curve F light emission parameter FPDO input power PW power parameter PHO lens curve PLT power input curve RRF light emission parameter curve X laser element Y lens < detailed description of the invention> Please refer to the first figure for the method of the invention 7 ----------- installation-(please read the notes on the back, ^ matters, and then fill in the pages) Alignment This paper size is applicable to China National Standard (CNS) A4 specification (210X297) %)

This step includes: (100) Entering a plurality of different light-emitting parameters PW, that is, a plurality of different light-emitting parameters such as the data writing mode TM PW1 to PWn (as shown in the second figure) of the optical disc drive. The wheel laser device makes the data write action on the disc, (11〇): the feedback signal Sl ~ sn (as shown in the first picture) relative to the light emitting parameters pw! ~ Pwn, In the reading mode, read back the emitted light source signal; (12) Perform a preliminary sampling calculation of the bottom curve fit on the feedback signals Sl ~ Sn, that is, the curve formed by the feedback signals S1 ~ & Sampling action of curve positioning operation; (130) Minimize (least squares _ operation, minimize the value obtained by the operation calculated in the above step 120) to obtain a new light-emitting parameter; (140) Repeat step ι〇〇 ～ 13〇; (150) Get the final best luminous parameters; (160) The parameters are written into the laser power control system of the optical disc drive. Member of the Intellectual Property Bureau of the Ministry of Economic Affairs X Consumer Co., Ltd. Please cooperate with the third picture. Clarify the detailed operation of each step of the method shown in the first figure Let ’s further cooperate with diagrams for further explanation. Among them, the one shown in the third figure is a graph of the feedback signals Sl ~ Sn relative to the light-emitting parameters PWi-PWn shown in the first figure. To perform the bottom curve fit (bottom curve fit) preliminary sampling operation, first, a function is given to this curve to define the light-emitting function RRF (I), 1 = 1 ~ n. At this time, the sampling rule is followed: < 1 > When RRF (I) SRRF (I + 1), that is, when the slope between two points is positive (rise), then make RRF, (I + 1) = RRF (I), that is, forcing the next point to be the original point 8 Paper size is applicable to China National Standard (CNS) A4 specification (210X297 mm) 504675 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 ____: ___ B7_ V. Description of the invention (): < 2 > When RRFi i) > RRF (Bu [) 3, etc., then the tongue. When the point between points is negative (falling, then: RRFVi + h = RRF (1+ 丨) · That is, the value of the next point is unchanged. · Keep its original it, as in the third S, the three function points RRF (a), RRF (b), and RRF (c), [< a, b * c < n, know a, b, c three 笪 between i and η, In the above, 钭 Meng before the function point RRF (a) is negative (falling), each function point remains the original slag, and the state between the function point RRF (a) and the function point RRF (b) is positive (rising). · So {£ at each function point is forced to stay at RRF (a), forming a new function point RRF '(, a ·): and the relationship between the function point RRF (b) and the function point RRF (: c) The value of each function point during this time remains the same, and the slope after the function point RRF (c) is positive (: rise), so it is forced to be RRF (c ), Forming a new function point RFF (c). Please refer to the second graph shown in the figure. After the bottom face line positioning operation shown in the third graph, a new curve is obtained. We give a new definition of the luminous function as RFF (: I), 1 = 1 ~ η, Then, the luminous function sigh RFF '(I) is performed most, and the calculation order is not limited. In the present invention t is a fifth-order operation as an example, the calculation equation is Then it is listed as follows: RRF '(I) can be expanded to the fifth order as (A): RRF ^ AOfAirV Α3Γ3 丁 A4f + Vi ................... ... * · ,, (Α) 9 (Please read the precautions on the back before filling in, page * installed-， 1Τ thread The paper size applies the Chinese National Standard (CNS) A4 specification (210X 297 mm) 5 67 04 5 A7 B7 V. Explanation of the invention (the error function ν (ί) is the error of the fixed irtt), and then this RFF '(: I) is expressed in terms of moments; ^ is deducted into (B) formula: RRF .

Γ 1 1 1 1 1 | 1 1/2 1/4 1/8 1/16! | 1 1/3 1/9 υη ι / si I 1 / a1 l / n: i / n, ^ Ι / ά4 AO Al A2 Λ3 A4

VI

Va • (B) (Please read the notes on the back before filling in the HI page) Pack. Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs, and then simplify the moment (c): as follows: RRF = HA + V ·· ....... (c) Minimize the error matrix v applied by the above (: c) formula, and get the formula (D): Q (COST FUNCTION) = 1/2 VTV = 1/2 (RJRF-HA) T (RRJF-HA) ......... (D) Use the above strong (D) formula to bias A to ( E), the value of the minimization of the error moment barrier V is 0, and it is replaced in the formula (C), and then simplified as shown in the formula (F): ρ Θ l / 2 (RRF: HA) T (RRF-HA) = (RRF: HA) r (-H) = 0 · (E) Silk

PA HTRRF = HTBLA .............. (F) ίο This paper size applies to Chinese National Standard (CNS) A4 (210X297 mm) 504675 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs .. 丨 A7: _B7______ 5. Description of the invention () and get the final i G) Formula: Α · = [1-ΗΤ 广 HTRRF: ···· ............ (G) 该 (. G) 弍 shows the moment H and A related to the luminous function RRF ([) obtained from the bottom curve positioning process, so we can determine its final relationship as (Η) 弍: RRF (I > = HA ............ (H) Repeat the first step of the first picture ~ the fourth step of the nose step, that is, step 100 shown in the first picture ~ 130 'gp can obtain the new luminescence parameter RRF obtained by the second bottom west line positioning operation "' its value after the second bottom curve positioning and different operation 'has completely eliminated the disturbance caused by the disc assembly lens assembly deviation The factor is an optimized luminous parameter value, which can make the snow light emitting element of the optical disc drive output the maximum light source energy. 3 Please refer to the fifth figure again. It can be obtained by the same reason. Reading line BHO and power input After the western line PLT is calculated by the above method of the present invention, after processing, the light source S feed number BHO ”and the power input parameter PLT” that have eliminated the disturbance factors caused by the lens assembly deviation of the optical disc drive, and these calculation methods, Both the equations and the matrix can be replaced by computer programs, and can be written into the relevant control elements of the laser light-emitting power control system 100 of the optical disc drive. * The detailed application situation will be described in depth and further below, and the computer The program or software is not the invention_ a___ This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) (Please read the precautions on the back before filling in the page) • Binding. 504675 A7 B7 V. Explanation of the invention () The desired binding and the subject matter “are not listed and explained in detail. Please cooperate with the sixth figure” is the method of the present invention, which is actually applied to the power control system of laser light emission of optical disc players. 100, where the power control system includes a reference optical process controller (R.〇.pC) 1〇, laser power control 20. Laser element 30, pickup element 40, parameter feedback element 50, first sensing unit 60 and second sensing unit 70, where laser element 30 is formed by a laser diode and is subject to laser Light source energy (light emission) is generated by the control of the power controller 20; the pickup element 40 and the parameter feedback element 50 are both composed of light diodes, and can be used to sense signals reflected by the laser beam emitted by the laser element 30, and respectively Sent to the first sensing unit 60 and the second sensing unit 70 for processing of the sensing signal, and the luminous number controller 10 mainly feedbacks with the first sensing unit 60 through the output light parameter The negative signal is used for negative feedback calculation, and then the calculation result is sent to the above laser power control 5 | 20 as the basis for controlling the light emission of the laser element 30. The calculation equations, matrices, and calculation methods listed in the method of the present invention through the second to fifth figures can be written into a compensator 80 printed by a consumer cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs using a computer program or software. The feedback signal output from the output terminal and the second sensing unit 70 is calculated and sent to the light-emitting parameter controller 10, and the calculation result of the compensator 80 can be obtained to eliminate the disc assembly lens assembly deviation. The parameter data such as the optimized luminous parameter RRF ”, the light source feedback number Bii〇”, and the power input parameter PLT ”are provided to the entire power control system 100 ′ as the optimized control of the output light source energy of the laser element 30 Basis, and stored in the memory of the power control system 100, (not shown), and ___ 12 This paper is applicable ^^ Standards (CNs) A4 specifications (210X297 mm) '一' 6'Γχ 5 5 71 81 'I ί τ!

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Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. 5. Description of the invention (), no matter what kind of lens assembly the optical disc drive is caused by the disturbance factors, the laser element 3G automatically obtains the optimal output light source energy = output Control can greatly reduce the manpower and cost of the optical disc drive in the adjustment and testing. The application example is not limited to its disclosure = power control system. For example, all power control systems such as readable and writable optical disc drives and laser components can use this method and compensation control mode. And it can make all the laser components in the optical disc drive do not need to be adjusted or tested with a lot of manpower, which is an invention with great industrial utilization value. The inventive spirit of the present invention is to optimize and control the disturbance of the output light source energy of the laser element in the optical disc drive by using the most streamlined and effective and not completely manual adjustment and test methods. The laser component of the optical disc drive can provide a stable and optimal light source output in either a write or read mode. ~ The above figure-Figure ~ Figure 6 above shows the method for compensating the laser energy of the optical disc player of the present invention. The disclosed key descriptions and drawings are for the convenience of explaining the technical content and technical means of the present invention. The scope of the preferred embodiment is not limited thereby. In addition, all modifications or changes to the structural details of the present invention, or equivalent substitutions and replacements of the elements, without departing from the spirit and scope of the present invention, will be defined by the scope of the following patent applications. Please use 13 paper sizes to comply with China National Standards (CNS) A4 (21 × 297 mm)

Claims (1)

1. A method for compensating laser energy of an optical disc drive, the steps of which include: (a) inputting a plurality of different light emitting parameters, and inputting laser elements with a plurality of different light emitting parameters under the data writing mode of the optical disc drive to make the optical disc The film is used to write two materials. Stomach (b) Read back the feedback signal relative to the luminous parameter of step (a). In the read mode of the optical disc drive, read back the emitted light source signal. 进行 Make the bottom curve of the feedback signal. Positioning (bott0m curve Qiu's preliminary sampling operation 'is the sampling operation of performing curve positioning operation on the curve formed by the feedback signal in step (b); (d) Minimizing (least squares fit) operation. Minimize the obtained value to obtain new luminescence parameters; (e) Repeat steps (a) ~ (d); (f) Obtain the final optimized luminescence parameters; (g) The best of step (f) The laser power control system is written into the optical drive of the optical drive parameters. Μ Intellectual property staff of the Ministry of Economic Affairs X Consumer Cooperative printed it. The laser components of the optical drive were obtained through the above steps to eliminate disturbance factors and optimize the light emitting parameters. Make the energy of the light source output by the laser component of the optical disc drive the maximum, which is its characteristic. 2 · For the method of compensating the laser energy of the optical disc drive according to item 1 of the patent application scope, wherein the feedback signal of step (b) is provided by a The parameter feedback element is used for sensing and feedback. 3 · For example, the compensation method for the laser energy of the optical disc drive in the second item of the patent application scope, wherein the parameter return element used to sense the feedback signal is a photodiode. 14 Paper scale Applicable to China National Standard (CNS) Α4 specification (210 X 297 mm)