TW513692B - Calibration method of the returned light noise from the light source of optical disk driver - Google Patents

Abstract

The present invention relates to a calibration method of the difference with/without the returned light noise from the light source of optical disk driver, which is applied in calibrating the light-emitting parameters of the diode laser light source of optical disk driver, wherein NO DISC is first applied for rough calibration to obtain the initial value of the light-emitting parameters of the diode laser light source of optical disk driver, and perform rapid re-sampling between the power controller of the light source and the post-stage amplifier after the disc is loaded. Compute it with the light-emitting parameters to obtain the effect of the returned light to the light-emitting parameters with disk of the laser light source, which is sent to a compensator for ratio compensation and feedback correction, so as to obtain the laser stability light-emitting parameters affected by the returned light from the optical disk driver, record the stable light-emitting parameters in the memory as the light-emitting control parameters during the writing of the optical disk driver, and thereby achieve of purpose of calibrating the returned light noise of laser to the state of optical disk driver.

Description

513692 V. Description of the invention () < Field of invention > Actuator ^ 丨 Department ^ About the elimination of the impact of the light source of the optical disc drive by the back light of the optical disc You give feedback to adjust the perturbation of the back light phenomenon. < Background of the Invention and Previous Techniques > and + ^ Optical Diffusion Materials in Daily News, Audiovisual Equipment 2 = Information Equipment: To be used as the audio and video playback data of optical discs and the main equipment of electricity In the optical disc drive reading mechanism, the element used to retrieve or write data is the laser element used to emit light. The intensity of the light source emitted by the 7C will determine the quality of the optical disc drive to read and write data. 'Therefore, there are adjustments of the luminous parameters of the f-emitting element. In contrast, it is of great importance. Printed by the Consumers ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs β, the direct electric power relationship value of the laser element of the optical disc drive is known. The value is expressed in milliwatts (mw), that is, its output is expressed in units of power. Brightness or output parameter1 Luminous parameters of the entire laser element: the relative relationship between wheel-out and wheel-in is expressed in milliwatts / amps (MW / A), and its value can be regarded as a voltage value, as in the fourth This relationship is briefly revealed in the figure, in which the main input power of the laser element A is a current I ′ with a certain value, and the light source Pw emitted by the laser element A is exactly the above-mentioned output power value, but lies in reading or In the writing mode, the light source pw is focused on a disc b after passing through a lens group L1 and L2, so that the disc b is reflected, and the reflected light P is used for data reading except for a light receiving sensor (not shown) Taken as a reference, part of the reflected light p will be directly reflected back to the laser element A along the opposite direction of the emission path of the original light source pw, resulting in the output light source. This paper size applies the Chinese National Standard (CNS) A4 specification ( 210X 297 mm) 513692 Economy Printed by the Consumer Cooperatives of the Ministry of Intellectual Property Bureau A7 B7 V. Description of Invention ()

Pw's output power noise (noice), this phenomenon is usually called back light, so in the read and write control system of the optical disc drive, the back light phenomenon is included in the adjustment focus of the luminous parameters. The fifth figure shows a typical conventional readable and writable optical drive light source automatic power control (APC) system. I use this to illustrate the effect of the light return phenomenon on this system. Among them, the input The value FPDO indicates the input power control parameters. The primary amplifiers R1 and W1, the intermediate amplifiers R2 and W2 and the rear amplifiers R3 and W3 respectively represent the optical disk drive item and the signal amplification unit of the writing system, and the controllers PI and Γ are respectively Indicates the control unit used to control the output optical disk drive read and write light source control signals. The control signals are represented by Vr and Vw, and the sampling signals si and s2 represent the sample values of the read and write signals, respectively. The parameters R and W respectively indicate the values of the power parameters written by the reader, and the above-mentioned return disturbance caused by the emission end of the laser element A is represented by dV, and the power value of the light source Pw Simultaneously with the noise N1, a monitor MD calculates the feedback value as an input value Fpd0. Therefore, from the disclosure of the APC system of the conventional optical disc drive in the fifth figure above, it can be clearly seen that the return-light disturbance value Dv has a certain negative impact on the stability of the system, and the industry generally responds to such return-light disturbances. The value dV does not have a good adjustment countermeasure. The difficulty is that the value of this return disturbance value dV is not constant. It will vary with the light source Pw strength, the signal pickup head (such as the light sensor) and the layout of the PC board. ) The quality and other factors are different, that is, the return light disturbance value dV of each optical disc drive is not completely the same, it can not be uniformly adjusted with an empirical reference value, and 3 paper standards are applicable. China Country ^ (CNS 21〇χ2 · Dong)-one (please read the notes on the back before filling in this page)

513692 Printed by the Consumers ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the invention () And the adjustment of the return light disturbance value dV must be carried out under the condition that a disc is used as a reflection source. The optical disc, according to the conventional APC system adjustment method, is adjusted for the monitor MD, but because the disturbance factors of the return light are hidden, most of the adjustment results are based on experience. Implementation, once an optical disc drive product is made for optical discs to be read or written, in addition to the inability to accurately compensate and eliminate the phenomenon of returning light, due to the different degrees of reflected and returning light between different optical discs, the adjusted system is not It can fully comply with the read or write operations of all optical discs, so there may be cases where the picker cannot read or write data correctly. In addition, if the method of adjusting the monitor MD is obtained by placing the optical discs one by one and obtaining the actual return disturbance value dV, the strength of the light source Pw cannot be grasped before being adjusted, so that its light source Pw will be Due to excessive output power, improper energy is concentrated at a point on the optical disc, which causes damage like a puncher and burns the surface of the optical disc. It requires a considerable amount of adjustment materials and costs, which does not have industrial utilization value and economic benefits. And the final adjustment result may not be able to meet the read or write operations of all optical discs. <Objective of the Invention> The main object of the present invention is to provide a method for adjusting the disturbance of the optical disc drive's return light, in order to obtain the initial parameters without placing the optical disc, and then obtain the optical disc through dynamic feedback before the write operation. Luminous parameters when filming, adjust the luminous intensity and luminous parameters of the laser light source, so that it is not affected by the phenomenon of back light during reading and writing. Another object of the present invention is to provide an optical disc drive with light disturbance 4 (please read the precautions on the back of the book and fill in the page too). The paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm) A7 Five Consumers ’Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs printed a description of the invention () '~-The dynamic adjustment method can obtain accurate feedback correction parameters, so that the laser = source luminous parameters reach a stable value, close the record Available in memory. (Please read the notes on the back and fill in this page again) .: Another purpose of this month is to provide a method for disturbing the optical drive's return light. It is not necessary to consume a large number of optical discs for adjustment, which can save adjustment. The time and cost of the school and the real-time adjustment due to different circumstances (re-calibration once every time the disc is inserted). ~ The following is to make your reviewing committee understand the detailed technical content and application status of the present invention. The following is a description of the two preferred embodiments and the accompanying drawings. Brief description of the drawings: The first diagram is a block diagram of the control system of the present invention; the second diagram is a waveform diagram of fast resampling for reading the luminescence parameters in the present invention; the third diagram is the laser luminescence parameter adjustment of the present invention The flowchart is as follows: Figure 4 is a schematic diagram of the phenomenon of light return when a conventional laser element emits light; Figure 5 is a block diagram of a conventional optical drive automatic power control (APC) system; (2) Figure number: & lt Part of the invention &gt; 100 Light control system 10 Amplifier 20 Amplifier 30 Amplifier 40 Controller 50 Preamp sampler 60 Power parameter input module 70 Monitor 5 This paper size applies Chinese National Standard (CNS) A4 specification (21 OX297 mm)

513692 A7 B7 V. Description of the invention (80) Fast sampler FPDO 'input value N1 Noise VRini RP VR * 200 210 220 230 240 240 260 270 Known part &gt; Initial light parameter reading Power parameter Light parameter No disc Get K value Get initial luminescence parameter VRini Quick re-sampling to get back light influence value dv 'Evaluation operation Back light disturbance influence for compensation processing Perform feedback correction to generate stable light emission parameter VR * Record stable light emission parameter VR * 90 Compensator L1 Laser Luminous element VRo output luminous parameter I / k Compensation ratio dv 'Return light influence value Printed by Employee Consumer Cooperative of Intellectual Property Bureau of Ministry of Economy A Laser element I Current Pw Light source L1 Lens group L2 Lens group B Optical disc P, reflected light R1 Primary amplifier W1 Primary amplifier R2 Middle amplifier W2 Middle amplifier R3 Post amplifier W3 Post amplifier FPDO Input value Vr Control signal Vw Control signal si Sampling signal s2 Sampling signal (please read the precautions on the back before filling this page)

This paper size applies the Chinese National Standard (CNS) A4 specification (210X 297 mm) 513692 Printed by the Consumers ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the invention () dv Return light disturbance value N1 Noise MD monitor R Input parameter W Input parameter &lt; Detailed description of the invention &gt; First, please refer to the first figure, which is a system control block diagram of the method of the present invention. The input value FPDO 'in the light-emitting control system 100 represents the power of the optical disc drive. The total input power parameter of the light-emitting element L1, and the amplifiers 10, 20, and 30 represent the front, middle, and rear-stage amplification elements, respectively, while the controller 40 is the main calculation unit of the light-emitting parameters, and the front-stage sampler 50 is The primary sampling element indicating the light emission parameter in the reading state is usually called SHR, (SAMPLE &amp; HOLD FOR READ). The power parameter input module 60 is used to input light emission parameters, and the monitor 70 is also known. System components, so its structure and principle are not described in detail. Noise N1 is the noise interference that affects the signal operation of the optical disc drive. Please cooperate with the second figure. In the system block diagram shown in the first figure above, a fast sampler 80 is provided between the controller 40 and the amplifier 30 at the subsequent stage, which can quickly control the controller 40. The output luminous parameters are quickly sampled. The sampled waveform is shown in the second figure. Among them, the output luminous parameter VRo represents the luminous control signal output from the controller 40 to the amplifier 30, which is the final output parameter. When the output is instantaneous, it is quickly sampled by the fast sampler 80. The sampling cycle is in the working cycle of the previous sampler. After the sampling is completed, a light impact value dv 'is obtained. An initial luminescence parameter VRini is calculated and sent to a compensator 90 for proportional compensation. The compensation ratio value can be defined as 7 first. The paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X 297 mm) (please (Mao read the notes on the back and fill out this page)

513692 Printed by the Consumer Property Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the invention () I / k, there are reasons for the above-mentioned initial luminescence parameter VRiili and compensation ratio value 1 / k, which will be explained in detail in the following text , Ronghou Chen Ming. The above-mentioned compensator 90 is fed back to the input terminal of the controller 40 after performing calculation with the read power parameter RP, and then the output of the intermediate amplifier 20 is input to the controller 40. Therefore, with the rapid sampling, compensation, and feedback architecture, the light-emitting parameters input through the controller 40 can reach a stable value. Please refer to the third figure again, which is a flowchart of the method of the present invention. The steps include: (200) obtaining a K value without a disc; (210) obtaining a light-emitting parameter VRini when reading; (220) obtaining by rapid resampling Return light influence value dv '; (230) Evaluate and calculate the influence of return light disturbance; (240) Compensate; (250) Perform feedback correction; (260) Generate stable light emission parameters VR *; (270) Record stable light emission parameters VR *. The initial light emission parameter VRini in step 210 is to correct the laser light emitting element L during reading by placing a disc, and then obtain an initial value of the light return state of the laser light emitting element L when reading. Then, the fast sampling process in step 220 is used to quickly sample the instantaneous output of the controller 40 into the light-emitting parameter by the fast-sampler 80 to obtain the reflected light influence value dv ', and calculate and calculate with the initial light-emitting parameter VRini. To make its return light impact assessment, and through the processing method of step 240, apply 8 paper sizes to the Chinese National Standard (CNS) A4 specification (210X 297 mm) (Please read the notice on the back before filling in this page)

513692 Printed by the Consumer Property Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the invention () The evaluation result is sent to the compensator 40 for proportional compensation calculation, and the compensation ratio value 1 / K is for reading the power parameter RP / output luminescence The value of the parameter VR refers to the fixed compensation mode and the feedback correction action in step 250. After the compensation process, the value is calculated with the read power parameter, and the result of the calculation is then compared with the intermediate amplifier 20 The output phase is calculated to obtain a stable light-emitting parameter VR *, which is input to the controller 40, so that the controller 40 can output a relatively stable output light-emitting parameter VRo that is not affected by the writing back light, and can provide an optical disc. The machine controls the memory in 1C to record it. Therefore, according to the processing steps and system operation of the method of the present invention shown in the first to third figures above, the laser light emitting element L of the optical disc drive can stabilize its light emission parameters without having to place an optical disc. The calibration can completely eliminate the compensation of the light return phenomenon that is actually applied in the data reading mode of the optical disc. The reason is that the fast sampler 80 and the compensator 90 constitute a fast sampling feedback correction circuit, so that the entire thunder The light-emitting control system of the light-emitting element L is actually applied in an application mode in which data is read from the optical disc, and can automatically and accurately compensate and eliminate the phenomenon of returning light disturbance. The light-emitting output power of the laser light-emitting element L is obtained, and its stability is obtained. The light emission parameters can further save the man-hours and costs of adjusting the light emission parameters of the optical disc drive. In other words, when a disc is placed, it automatically evaluates the method of compensating for the disturbance of write-back light and feedback to produce stable luminous parameters. The inventive spirit of the present invention is to adjust and correct the light-emitting parameters of the laser light-emitting element in the optical disc drive by the most simplified and effective adjustment method, which can affect the light emission disturbance of the laser light-emitting device. Cheng 9 (please K) read the notes on the back before filling in this page)

This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) 513692 A7 V. Description of the invention () The most stable luminous parameters can be obtained. The related descriptions and drawings disclosed in the above-mentioned Figures-Figures 3 to 3, in order to facilitate the explanation of the technical content and technical means of the invention, the-of the disclosed preferred embodiment, does not therefore Restricted. In addition, all modifications or changes to the structural details of the present invention, or equivalent substitutions and replacements of the documents, without departing from the spirit and scope of the present invention, will be bounded by the scope of the following patent applications. (Please read the precautions on the back before filling out the page. Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs. 10 This paper size applies to China National Standard (CNS) A4 (210X297 mm).)

Claims (1)

513692 AcS B8 C8 D8 &quot; &quot; &quot; 11 | _ '&quot;' &quot; '&quot;' 1 — _— '_ ^ VI. Application for patent scope 1 · A method for adjusting the disturbance of the light return of the optical disc drive light source' First use NO DISC as a rough calibration as the design value of the compensator, and obtain the initial value of the light emitting parameter of the laser light source when reading, and the light source power controller of the light emitting control system of the laser light emitting element. Quick re-sampling between the amplifier and the post-amplifier, to calculate the initial value of the luminous parameter, to obtain the influence value of the laser light return on the luminous parameter, and send it to a compensator for proportional compensation and feedback correction processing to obtain A stable light-emitting parameter that is not affected by the back light, and this stable light-emitting parameter is recorded in the memory to be used as a light-emitting control parameter when the optical disc drive is read. 2. The method for adjusting the disturbance of the light return of the optical disc drive according to item 1 of the scope of patent application, wherein the fast sampling processing step between the power controller of the light source and the amplifier of the subsequent stage is performed by a fast sampler. 3. The adjustment method of the light source light disturbance of the optical disc drive according to item i of the patent application scope, wherein the proportional compensation value of the step of the proportional compensation step of the compensator is the reading power parameter of the laser light emitting element / round out light emitting parameter. . I ....... · -------. Read T especially 3 reading back ^; 1 ..% of the matter and fill in this page) Scripture 4 'The Ministry of Wisdom 1 Finance and 4 Bureau employee consumer cooperatives print this paper in accordance with China National Standards (CNS) A4 specifications (21〇x public money)