TWI271728B - Focusing apparatus and method for an optical drive - Google Patents

Abstract

A focusing apparatus and method for an optical drive includes a modulator modulating RF signal from a pick-up head into digital signal. During modulating process, an error-correcting unit is used to correct the readout RF signal, and a PIPO generator generates a PIPO signal based on correcting times. The PIPO signal is compared with former PIPO signal and the target of PIPO signal to secure the direction and velocity of converging toward focusing balance. By adjusting the direction and velocity of converging, a focusing servo unit controls the pick-up head to adjust focusing condition for achieving the focusing balance so as to increase efficiency of the disk drive.

Description

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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc player, a rice and a bean M% focus adjustment method, which adjusts the balance position of the focus in the installed position of the read head = taken in the god Du + a old clothes and improves the disc machine system [Previous Technology] Due to the rapid increase of multimedia technology, the data density is multiplied with the amount of data that needs to be processed in an emergency, and the micro-number processing on the optical disc is converted into an effective data rate. The memory capacity of the development of optical discs has increased. The disc player increases in the same unit time. Therefore, it is necessary to quickly make the reading head small and dense, and a large number of tokens are used to maintain the overall operation of the disc player as shown in Fig. 1. The focus adjustment device of the conventional disc player is utilized. The reading head i projects the light beam 2 to the optical disc 3, and the optical disc 2 reflects the light beam 2 through the reading head 1 to be irradiated to the light energy converter 4 such as a photovoltaic cell. The light energy converter 4 has four light receiving portions, which are equally divided into A, B, (and 0), and respectively receive different regions in the reflected light beam, and convert the received light amount to a relative intensity. Then, the input amplifier (AmPlifer) 5. Add the electric signals of the light receiving parts of A, c and B, 1 respectively to form the electrical signals of (A + C) and (B + D), and then (A+0-(/+1) The two are subtracted to form a difference signal, and amplified to form a focus error signal FE (Focus Error), which is transmitted to the compensator 6. The compensator 6 forms a control signal via the focus feeding unit w (Focusing Servo) Unit)7 controls the read head to lock the sound point on the mark of the fast rotating and vibrating optical disc 3, so that the light energy converter 4 is four

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The light receiving part can correctly receive the reflected beam, A + B + C + D) RF signal RF (Radio signal, improve the reliability of the RF signal RF modulated into the output data signal. The amplifier 8 is added to form ( Frequency), converted by a representative unit (Modulat〇r) 9, but the focus point is a small distance range, the aforementioned focus adjustment device, 疋 ♦ focus is not necessarily the strongest position of the RF signal 。. Using a small electrical signal as a calculation judgment, 』= : system error of the disc player itself, for example, uneven projection of the system laser light source, "precision of easy reception = or influence of four light receiving portions of the light energy converter 4" It is not easy to ensure the true focus of the focus. RF signal RFi disc adjustment focus device, R. " output from the amplifier 8 using the RF signal conversion circuit (Radio FrequenCy = two "" two, that is, RFRP circuit 1 〇, the RF The signal RF is converted into the anti-KtKPofL soul. By, ▼ 隹 a bribe of the 隹 2 2:: 衡: 7011 record and compare the adjacent error signals, the second method, find the strongest rfrp , production signal fine lock convergence = 6 shape control signal 'and with the focus error to achieve the strongest RFRP dry ^ ^ ^ ^ servo unit 7 control adjustment read η ^ Μ 的 of the coking conditions to directly ensure reading Head 1 = f frequency signal RF is the strongest to facilitate decoding. C〇deri or 〇 ^ 己 = shot = signal RF only represents binary code (Binary number. With the well-known EFM (Ϊ·, h need to transcode 'not a disc For example, the signal directly output by the machine is converted into a binary value by the original ^^ t〇F〇urteen Modulation 8-14: the n 11 digit code is converted into a symbol of 1 4bi t, Marks are formed on the disc. Therefore, 1271728 V. Description of the invention (3) = The RF signal of the 14bi t mark must be swollen - read - 敕, the 匕 匕 modulated unit 9 is correctly decoded into 8 bi The radio frequency is the strongest, and can not be guaranteed; / one = remember J's 隹 有 ί There are 4 in the process of finding a strong RF signal RF, the week of Shishi makes several of the same group of digital signals = Decoding 'to find the strongest RF signal heart; paste still = = l: the performance of the entire system. Because &,::: The method still has problems ♦..., 死正 [Invented by the detection of the balance position, this method, the use of suitable for the purpose, including the material digital signal RF signal relative to the PIPO focal balance and speed, take the head adjustment The purpose of the Ming dynasty is to adjust the focus balance of the front and rear adjustments in the process of modulating the disc to achieve the aforementioned modulating unit number. In the modulation, a PIPO is said. The PIPO signal is further transmitted to the focus balance bit to provide a whole of the decoded product in the in-focus position. In the process of changing the tone, the signal is generated by a signal value, a compensator, a disc focus adjustment device and a method, and the quality of the focus is automatically adjusted. A disc machine focusing adjustment device and a direction and speed of convergence of the disc, in order to quickly adjust the focus of the disc player of the present invention to receive and receive the radio frequency signal from the read head as a 'two debug unit for correcting the readout The correction error is generated by a focus balance calculation unit to compare the direction in which the read head gathers by the focus balance position, and the focus servo unit to control the read to quickly reach the focus balance position, and improve

Page 8 1271728 V. Description of the invention (4) Overall performance of the disc player. The focus adjustment method of the disc player of the present invention generates a PI P0 signal in the signal modulation process relative to the number of times each group of signals is erroneous. First, the reference value of the position of the focus balance is adjusted, the variable for adjusting the focus balance, the direction of the focus balance position, and the target value of the P I P0 signal are accepted. Compare the input PIPO signal with the target value of the PIPO signal; if the PIPO signal is less than or equal to the target value of the PIP0 signal, the position of the original focus balance is maintained; otherwise, if the p丨p〇 signal is greater than the target value of the P IP0 signal, the focus balance is increased or decreased. Position a predetermined amount, adjust the position of the t-focus balance'. The newly generated p I p 〇 signal is compared with the target value of the p I p 〇 signal and the previous PIPO signal respectively, and the direction and speed of convergence of the focus equilibrium position are obtained, and the adjustment is moderately adjusted. The direction of convergence and the predetermined amount until the PIP0 signal is less than or equal to the target value of the PIPO signal, improving the overall decoding efficiency. [Embodiment] The present invention has been made in view of the above-described objects, the technical means and the effects thereof, and the preferred embodiments thereof are described below with reference to the drawings. Referring to Fig. 2, the disc player of the present invention focuses on the adjustment. , _ signal generator 21, focus flat / play calculation list: = and poly; U service unit 24. Mainly, the RF% 铐RF / , "Beige/Frequency of the read head disc disc mark in the disc player is decoded by the modulation unit 2〇, and the PIP0 (Inner one) (3) de an 〇uter —c〇de Parity) The PIPO signal of the signal generator 2, using the convergence of the 隹 隹 当 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 Mo Hao hide, transmitted to the compensator 23, with the change 隹哔 # 1味 π, 决 Λ 此 此 《 ♦ ♦ ♦ 焦 焦 矾唬 形成 形成 FE forming a focus control

Page 9 1271728 V. INSTRUCTIONS (5) f ’ Precision control by the focus servo unit 24 controls the read head to automatically adjust the focus balance position to maintain decoding quality. It is: 'The modulation unit 20 includes a signal processing unit 26, a debugging unit 27, a code unit 28, and the like. The signal processing unit 26 converts the RF signal RF received from the read head 25 into a digital signal, that is, 〇 or 1 in the binary code, for an analog/digital signal transfer. The error-correcting unit (ECC, Error Correct::27) fills the binary code converted by the signal processing unit 26 into a fixed fixed format one by one, and discriminates whether the read symbol is wrong or not, so as to perform the school: the reading is correct. The symbol is decoded into a digital bit by the decoding unit 28. As the output of the disc player, in the above-described modulation process, the decoding unit 27 performs the decoding modulation for correcting the readout signal. The PIPG signal generator 21 is used. A relative ?11> signal is generated for the corrected value of Wei Si. When PIP0 = " ' represents more errors in readout marks, the more difficult it is to decode: 2 2 when PIP 〇" value is smaller, On behalf of the read mark error, the value is changed. Therefore, the debug unit 27 can be used according to the PIP0 message. Ϊ: Ϊ: Stop decoding and modulation. This PIP signal is generated by S-known technology. The technology is not here. It is not the case. The focus is on the balance signal. The main signal is the relative value of the PIP0 signal. : balance position, specific direction and speed, appropriate Set the adjustment of the two balances: ... the arrogant side focus servo unit 24 adjusts the read head through the t. The hunting compensation state 23 moves up and down through the lens to achieve the focus balance Ϊ 271728 invention description (6) position, make the PI P0 signal value Maintain the performance below the target value. For the smooth implementation of the solution, please refer to Figure 3. The present invention uses the comparison of the PIP0 signal value to determine the convergence direction and speed of the balance position, and decides to adjust the focus balance. Setting step 31: , firstly returning the reference value of the focus balance position FB = 0, adjusting the focus balance variable ΔFkO, setting the direction of the focus balance to converge, and setting the acceptable PIPO signal target. The value is pip〇1:. Comparison step 32: Set the currently input PIPO signal to PIP〇n, and compare it with the target value pip〇t, that is, judge PIPOn >PIPOi: ?, if not, that is? If the error of 〇11 is within the acceptable standard range, then the maintenance step 36 is used to maintain the position of the original focus balance; for example, p I p 〇n > p I p 〇t, it means p I p 〇n Too many errors, focus on balance If the setting is bad, adjust the position of the focus balance. Adjustment step 33: Set the variable AFB to adjust the focus balance to a predetermined amount, for example, △ FB = 5, if the setting step 31 is set to the direction of convergence to the increasing direction, adjust the focus balance. Position FB is added with a predetermined amount of AFB. Generate new PIP0 signal Step 34: Let n = n+l to generate the next new PIP0 signal, and set to Ρΐρ〇η + ι 〇 Convergence speed comparison Step 35: Put the newly entered PIPOn+ 1 compares the size with the target value PIp〇t, that is, judge

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V. Invention description (7) PIPOn + 1 >PIPOt ? If no 'that is adjusted Ρΐρ〇η+ι, its error is within the acceptable standard range' to maintain step 36 to make FB = 0, maintain the present Focusing on the balanced position; if PIPOn+1 > PIP〇t, it means that PIPOn + 1 has too many errors, the position of the focus balance is bad, and the position of the focus balance needs to be adjusted.

〇I Convergence direction comparison step compares the newly input PIPOn + 1 with the previous PIPOn, that is, judge PIPOn+1 >PIP〇n? If no, then increase the direction to the correct convergence direction', enter the increase convergence step 38, The position FB of the focus balance is adjusted by adding a predetermined amount of AFB, and is returned to the step 34 of generating a new PIP0 signal to continue execution. If ΡΙΡ0η+1 >PIP〇n, increase the direction to the wrong convergence direction, enter the reduction convergence step 39, adjust the focus balance position FB minus the repetition to generate a new PIP0 signal. Step 34: ^"ΔΡΒ Then return to generate The new PIP0 signal is step 34 and continues. Until the newly generated PIP0 signal is less than PIPOt. In the embodiment of the adjustment focus balancing method of the present invention, the direction in which the position of the set = focus balance converges is the direction of increase and the position where the position balance is set to be set to = can be achieved, or The non-fixed focus balance variable 亦 also reaches the goal of the door of the month of the month' without departing from the technical scope of the invention. The radio frequency information outputted by the tuner 25 is used to convert the radio frequency information to the digital signal, and the processing unit 26 converts the digital signal into a digital signal, and then the second signal is generated by the signal generator. And using the debugging process, generating a ΡΙΡ0 signal representing the error rate, by focusing on page 12, 1271728. 5. The invention (8) balance calculation unit 22 calculates the direction and speed of the convergence of the relative focus balance position, and transmits the compensation to the compensation. The device 23 cooperates with the focus signal ' to control the focus balance position by the focus servo unit 24, and generates a total error by a set of symbols' to save the debug unit 27 from debugging 28 to smoothly decode the digital signal that is converted into an output. The above is only for the sake of convenience, and the scope of the present invention is not limited to the above-described modifications, without departing from the scope of the invention. The value of the raw PIPO signal is judged, and the error signal FE that determines the focus balance is adjusted to form a focus control head, which quickly reaches a suitable poly-lowering PIP0 signal value to reduce the wrong operation time. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT OF THE INVENTION The preferred embodiment of the present invention is in accordance with the spirit of the present invention.

1271728 Brief description of the drawing [Simplified description of the drawing] Fig. 1 is a functional block diagram of the focusing adjustment device of the conventional disk player. 2 is a functional block diagram of a focus adjustment device of the disc player of the present invention. 3 is a flow chart of a focus adjustment method of the disc player of the present invention. [Main component symbol description] 20 Modulation unit 21 PIP0 signal generator 22 Focus balance calculation unit 23 Compensator 24 Focus servo unit 25 Read head 26 Signal processing unit 27 Decryption unit 28 Decoding unit 31 Reset step 32 Comparison step 33 Adjustment Step 34 Generate New PIP0 Signal Step 35 Convergence Speed Comparison Step 36 Maintenance Step 37 Convergence Direction Comparison Step 38 Increase Convergence Step 39 Reduce Convergence Step RF RF Signal FE Focus Error Signal △ FB Adjust Focus Balanced Variable FB Focus Balance Position Reference Value PIPOt Target value PIP0 signal PIPOn Now input PIPO signal PIPOn + 1 Next PIP0 signal

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Claims (1)

1271728 Sixth, the scope of application for patents 1 · A disc player focus adjustment to produce an RF signal, today 2 f, the disc player has a read head to read the mark a mother 罝 - ^ to the focus adjustment device contains: 7G, receiving U ☆ digital signal; 目 取 取 RF signal, converted to data - PIP 0 signal generator, the number of errors, generate a ρ τ ΡΛ 对该 对该 对该 对该 对该 对该 对该 对该 对该 对该I ρ〇 signal; and a focus balance calculation single-open signal value, the t-focus balance bit § tb is closer to the head focus position of the read head focus balance position. Set the direction and speed of convergence, adjust the reading 2 · According to the scope of patent application 坌 The modulation unit enters a disc focus adjustment device, and its digital signal conversion. v匕 contains a signal processing unit as an analogy / 3 · according to the modulation number in the application. 4 · According to the application, the debug number. 5 · According to the application, the modulation order becomes a digital message. 6 · According to the application, the disk machine focus adjustment device described in the first paragraph of the patent calculation unit 1 is further included, and the bean 70 further includes a debugging unit for correcting The disc focus adjustment device described in item 3 of the scope 1 is read, and the element k ί, PIP 〇 signal is generated to generate a relative p I p. The device, the element further comprising a decoding unit to decode the read symbol to be the output of the disc player. The disc machine focus adjustment device according to the first item of the patent scope, the compensator and the focus servo unit, the compensator receives the focus flat signal, and controls the read head adjustment via the focus servo unit. Page 15 1271728 VI. Patent application scope Focus on the balance position. 7^—The focus adjustment method of the disc player, the disc machine generates a PIP0 signal in the signal modulation process relative to the number of times each group of signals is wrong, and the steps include: · 曰 (1) return to zero focus balance position reference Value, adjust focus balance change s, focus balance position convergence direction and accept PIP signal target value; (2) compare input PIPO signal and PIPO signal target value; (3) if PIPO signal is less than or equal to PIP0 signal target value , maintain the original focus balance position; and 'K (4) If the PIPO signal κ ΡΙΡ〇 signal target value, adjust the focus balance position 'until ΡI Ρ 0 signal is less than or equal to ΡI Ρ 0 signal target value. 8. In the disc machine focus adjustment method according to item 7 of the patent application scope, the step (1) sets the direction of the focus balance to be increased by 9. The disc drive according to the seventh application of the patent application scope In the focus adjustment method, the step (1) sets the direction of the focus balance to be reduced by 1 0. The step (4) of the disc focus adjustment method according to the scope of claim 7 further includes the steps: (5) Set the variable for adjusting the focus balance to a predetermined amount, and add the reference value of the position of the focus balance to the predetermined amount to adjust the focus; (6) compare the newly generated ΡΙΡ0 signal with the ΡΙΡ0 signal target value; (7) , the raw ΡΙΡ0 signal is less than or equal to the ΡΙΡ0 signal target value, maintaining the current focus balance position; and (8) if the newly generated ΡΙΡ0 signal is greater than the ΡΙΡ0 signal target value, then continue to compare the newly generated ριρο signal with the previous ΡΙΡ0 signal; 9) If the newly generated Ρ IΡ0 signal is less than or equal to the previous ΡIΡ0 signal, it will be Page 16 1271728 6. The scope of the patent application is added to the position of the focus balance to adjust the focus; (10) If the newly generated PIPO signal is greater than the previous PIPO signal, the current focus balance position is subtracted from the predetermined amount. , adjust the focus; and (11) repeat step (6) until the newly generated PIPO signal is less than or equal to the PIPO signal target value. 11. The disc player focus adjustment method according to claim 10, wherein the step (5) sets the variable for adjusting the focus balance to a fixed predetermined amount. 1 2. According to the disc machine focus adjustment method described in claim 10, wherein the step (5) sets the variable for adjusting the focus balance to a non-fixed pre-quantity. Page 17