TW498322B

TW498322B - Tracking error detection device

Info

Publication number: TW498322B
Application number: TW90100685A
Authority: TW
Inventors: Toshinori Okamoto
Original assignee: Matsushita Electric Ind Co Ltd
Priority date: 2000-01-13
Filing date: 2001-01-12
Publication date: 2002-08-11
Also published as: WO2001052251A1; JP2001195754A

Abstract

Tracking error detection device of present invention is provided wherein the output of PIN photo diode 1a to 1d generated according to its respective assembly concerned, is transformed by selectors 11a, 11b, and then sent to a phase error detection circuit 13 of last section. The output of said phase error detection circuit 13 is further input into a low-pass filter of last section. In the tracking error detection device thus constructed, phase error detection means and low-pass means for the detection of tracking error signal can be shared with the phase error detection means and low-pass means for the detection of off-set signal. The shared phase error detection means and low-pass means can be used in a time sharing way, so that tracking error signal and off-set signal can be detected. Therefore, in the optical-record reproduction device, the effect of miniaturization and low power consumption of a circuit for the control of tracking a pick-up light can be obtained.

Description

經濟部智慧財產局員工消費合作社印製 498322 A7 B7_—_ 五、發明説明（I ) 發明之頜域本發明是關於一種追蹤誤差檢測裝置，用來在以光拾取而使光學信號被錄製到訊息錄製媒體或重現的光記錄重現裝置中，產生可控制光拾取追蹤所用的追蹤誤差信號及補償信號，特別是可提供具體手段以達成其電路之小型化及低消費電力化。 i例技術之說明從記錄媒體上以凹凸之坑（pit)方式將訊息記錄之光碟上獲得追蹤控制信號之方式，被稱爲相位差法或 DPD(Differential Phase Detection)法。此方法是利用，照射到光碟上之光點在通過坑上方時，由於光點偏離坑之中心而使受光元件上之影像（繞射圖型）產生變化，受光元件在坑之影像的軌跡長度方向上具有被分割之領域，各領域上因應於受光光量之輸出信號之位準，其變化方式視光點偏離坑之中心的方向及量而有所不同，受光元件之輸出以預定之位準成爲2値化之後，與其2値化後之信號相位比較時，各領域上從受光元件之受光量，看那一個先變化，以及位準變化之時間差（相位差），則顯示光點偏離坑之中心的方向及量用的追蹤誤差信號可被獲得。第3圖至第5圖爲，光點23通過訊息坑22上方時，有4個分割之感測器21之受光領域24,25，26,27上，其受本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） (請先閱讀背面之注意事項再填寫本頁)Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 498322 A7 B7___ V. Description of the Invention (I) The invention of the jaw field The present invention relates to a tracking error detection device for optical signals to be recorded into a message by optical pickup In a recording medium or an optical recording and reproducing device for reproduction, a tracking error signal and a compensation signal for controlling optical pickup tracking can be generated, and in particular, specific means can be provided to achieve miniaturization of the circuit and low power consumption. Explanation of the example technology The method of obtaining a tracking control signal from a disc on which information is recorded in a pit manner on a recording medium is called a phase difference method or a differential phase detection (DPD) method. This method makes use of the fact that when the light spot irradiated on the optical disc passes over the pit, the image on the light receiving element (diffraction pattern) is changed because the light spot deviates from the center of the pit, and the track length of the image of the light receiving element in the pit is changed. There is a divided field in the direction. In each field, the level of the output signal depends on the amount of light received. The method of change varies depending on the direction and amount of light spot deviation from the center of the pit. The output of the light receiving element is at a predetermined level. When the phase of the signal is compared with the signal after the signal is converted to 2 digits, the time difference (phase difference) between the first change and the level change of the light receiving element in each field is used to show that the light spot deviates from the pit. A tracking error signal for the direction and amount of the center can be obtained. Figures 3 to 5 show that when the light spot 23 passes above the message pit 22, the light receiving areas 24, 25, 26, and 27 of the four divided sensors 21 are applied. The paper size applies the Chinese national standard ( CNS) A4 size (210X297mm) (Please read the precautions on the back before filling this page)

498322 A7 B7 經濟部智慧財產局員工消費合作社印製五、發明説明（》）光點23通過訊息坑22中央之情形時，如第4圖所示，其遠場圖型維持左右對稱而變化。而且，如第3圖、第5圖所示，光點23從中央偏離而通過之情形時，其遠場圖型之左右對稱性會被破壞，視變化的方法而產生時間差（相位差）。如第3圖所示，光點2 3從訊息坑2 2中央偏右側通過之時，爲向順時針方向旋轉地產生變化。反之，光點23從訊息坑22中央偏左側通過之時，如第5 圖所示，爲向逆時針方向旋轉地產生變化。這種圖型之變化，由於光點23偏離訊息坑22之中央而變成更鮮明。因此，光量被轉換成電氣信號，其時間差被檢測而進行處理，可獲得如第7圖所示之追蹤誤差信號。追蹤誤差信號如第3圖、第5圖所示，反射光量在4 個分割之感測器21的受光領域24,25,26,27上被接受，從位於各對角上之受光領域之和，減去信號之差的話，追蹤誤差信號成爲零，光點23會在軌跡之正上方，即所謂的「軌跡上」（ontrack)之狀態。另一方面，光點23移離訊息坑22時，因應其光量，其遠場圖型之強度分佈的左右對稱性會被破壞，而產生追蹤誤差信號。但是，即使光點23在訊息坑上方形成時，遠場圖型之中心與4個分割之感測器的分割線產生偏離，此時之追蹤誤差信號在「軌跡上」之狀態下不會成爲零。因而產生補償，追蹤誤差信號變成從第8圖所示之補償基準値爲〇時偏離的本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 498322 經濟部智慧財產局員工消費合作社印製 A7 ____ _B7_五、發明説明（\ ) 波形。第6圖顯示補償誤差產生時，分割感測器31之受光領域與光點3 2之遠場圖型之間的關係。如第6圖所示，光點32之遠場圖型與訊息坑之深度有關，使波長爲λ，訊息坑之深度如第6圖（1)，（2)中所示爲λ /4之情形時，即使透鏡移動時，各對角之圖型相同，時間差（相位差）爲零。如第6圖（3)，（4)中所示爲與λ /4不同之情形時，各對角之圖型會產生位準差異，因而產生時間差（相位差），故對追蹤誤差信號產生補償。在第9圖爲顯示先前技術之追蹤誤差檢測裝置的構成圖。以下將參照第9圖說明先前技術之追蹤誤差檢測裝置。第9圖中，光點通過訊息坑上方時，光之回折圖型（遠場圖型），其受光領域是由被分割成4塊之光檢測器60 而檢出。光檢測器60具有分割成田字型之4塊分割之受光元件70a，70b，70c，70d，會接受從光照射在訊息記錄媒體之軌跡上所形成的訊息軌跡反射光，因應於各受光元之入射光量而使光量被轉換成電氣信號。追蹤誤差信號被檢測之時，首先受光元件70a，70c之輸出信號由加算電路61a，與受光元件7 0b，70d之輸出信號由加算電路61b而加算在一起。即，位於對角線上之受光元件產生之輸出信號由加算電路61a與61b而加算在請先閲讀背之注意事項再填498322 A7 B7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of the invention (") When the light spot 23 passes through the center of the information pit 22, as shown in Figure 4, its far-field pattern remains symmetrical and changes. Furthermore, as shown in Figs. 3 and 5, when the light spot 23 deviates from the center and passes, the left-right symmetry of the far-field pattern is destroyed, and a time difference (phase difference) occurs depending on the method of change. As shown in Fig. 3, when the light spot 2 3 passes from the center of the message pit 2 2 to the right, it changes in a clockwise direction. Conversely, when the light spot 23 passes from the center of the information pit 22 to the left, as shown in Fig. 5, it changes in a counterclockwise direction. This pattern change becomes more vivid as the light spot 23 deviates from the center of the information pit 22. Therefore, the amount of light is converted into an electrical signal, and the time difference is detected and processed to obtain a tracking error signal as shown in FIG. 7. The tracking error signal is shown in Figures 3 and 5. The amount of reflected light is received in the light receiving areas 24, 25, 26, and 27 of the four divided sensor 21, and the sum of the light receiving areas located on the diagonals is summed. If the difference between the signals is subtracted, the tracking error signal becomes zero, and the light spot 23 will be directly above the trajectory, which is the so-called "ontrack" state. On the other hand, when the light spot 23 moves away from the information pit 22, the left-right symmetry of the intensity distribution of its far-field pattern will be destroyed according to its light amount, and a tracking error signal will be generated. However, even if the light spot 23 is formed above the information pit, the center of the far-field pattern deviates from the dividing line of the four divided sensors, and the tracking error signal at this time will not become "on the track". zero. As a result, compensation is generated, and the tracking error signal becomes the deviation from the compensation standard shown in Figure 8 when the paper size is 0. The Chinese national standard (CNS) A4 specification (210X297 mm) is applied. System A7 ____ _B7_ V. Description of the invention (\) Waveform. Fig. 6 shows the relationship between the light receiving area of the split sensor 31 and the far-field pattern of the light spot 32 when the compensation error occurs. As shown in Figure 6, the far-field pattern of light spot 32 is related to the depth of the information pit, so that the wavelength is λ, and the depth of the information pit is as shown in Figure 6 (1) and (2) as λ / 4. In this case, even when the lens moves, the pattern of each diagonal is the same, and the time difference (phase difference) is zero. As shown in Fig. 6 (3) and (4), when the situation is different from λ / 4, the pattern of each diagonal angle will have a difference in level, which will cause a time difference (phase difference), so the tracking error signal will be generated. make up. Fig. 9 is a diagram showing the structure of a tracking error detection device of the prior art. The tracking error detection device of the prior art will be described below with reference to FIG. 9. In Figure 9, when the light spot passes over the message pit, the light return pattern (far-field pattern), the light receiving area is detected by the light detector 60 divided into four blocks. The photodetector 60 has four divided light-receiving elements 70a, 70b, 70c, and 70d divided into a field shape, and receives reflected light from an information track formed by the light irradiating on the track of the information recording medium. The amount of incident light causes the amount of light to be converted into an electrical signal. When the tracking error signal is detected, the output signals of the light receiving elements 70a, 70c are first added by the adding circuit 61a, and the output signals of the light receiving elements 70b, 70d are added by the adding circuit 61b. That is, the output signals generated by the light receiving elements located on the diagonal are added by the adding circuits 61a and 61b. Please read the notes and notes before reading

訂線本紙張尺度適用中國國家標準（CNS ) Α4規格（210 X 297公釐） 498322 A7 B7 經濟部智慧財產局員工消費合作社印製五、發明説明（γ) 一起。其次，加算電路6 1 a與6 lb所輸出之加算信號之間的相位，由做爲第1相位誤差檢測手段用之相位誤差檢測電路62所比較，因應於比較後之差異的相位誤差信號經由做爲第1低域通過手段用之低通濾波器63，而求出追蹤誤差信號。而且，補償信號被檢測之時，首先受光元件70a，70b 之輸出信號由加算電路61c，與受光元件7 0c，70d之輸出信號由加算電路6 1 d而加算在一起。即，位於對角線上之受光元件產生之輸出信號由加算電路61c與61d而加算在一起。其次，加算電路61c與61d所輸出之加算信號之間的相位，由做爲第2相位誤差檢測手段用之相位誤差檢測電路64所比較，因應於比較後之差異的相位誤差信號經由做爲第1低域通過手段用之低通濾波器65，而求出追蹤誤差信號。但是，習知技術的追蹤誤差檢測裝置中，使用相位誤差檢測電路62及低通濾波器63的追蹤誤差信號，及使用相位誤差檢測電路64與低通濾波器65的追蹤誤差信號中的補償信號，是分別地被檢測出來之故，對電路的小型化及低消費電力化方面沒有效果。本發明之目的乃爲了解決上述問題而發展，追蹤誤差信號與補償信號之檢測中，使爲了作成習知之追蹤誤差信號，並且爲了作成補償信號而分別存在的相位誤差檢 (請先閱讀背面之注意事項再填寫本頁)Alignment This paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) 498322 A7 B7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. The invention description (γ) together. Secondly, the phase between the added signals output by the adding circuits 6 1 a and 6 lb is compared by the phase error detecting circuit 62 used as the first phase error detecting means. The phase error signal corresponding to the difference after the comparison is passed The tracking error signal is obtained as a low-pass filter 63 used as a first low-domain pass means. When the compensation signal is detected, the output signals of the light receiving elements 70a and 70b are first added by the adding circuit 61c and the output signals of the light receiving elements 70c and 70d are added by the adding circuit 61d. That is, the output signals generated by the light receiving elements located on the diagonal are added together by the adding circuits 61c and 61d. Second, the phase between the addition signals output by the addition circuits 61c and 61d is compared by the phase error detection circuit 64 used as the second phase error detection means, and the phase error signal corresponding to the difference after comparison is used as the first The low-pass filter 65 uses a low-pass filter 65 to obtain a tracking error signal. However, in a conventional tracking error detection device, a tracking error signal using the phase error detection circuit 62 and the low-pass filter 63 and a compensation signal in the tracking error signal using the phase error detection circuit 64 and the low-pass filter 65 are used. Because it is detected separately, it has no effect on circuit miniaturization and low power consumption. The purpose of the present invention is to solve the above problems. In the detection of the tracking error signal and the compensation signal, the phase error detection exists in order to create a conventional tracking error signal and to create a compensation signal (please read the note on the back first) (Fill in this page again)

、1T 線本紙張尺度適用中國國家標準（CNS ) Α4規格（210X297公釐） 498322 經濟部智慧財產局員工消費合作社印製 A7 B7五、發明説明U ) 測電路及低通濾波器被共用化，使共用化之後的相位誤差檢測電路及低通濾波器依照時間分割地方式而使用時，可達成電路的小型化及低消費電力化。本發明之扼要說明爲了達成上述目的，在申請專利範圍第1項之發明，是一種追蹤誤差檢測裝置，它具有：受光手段，在訊息記錄媒體之訊息軌跡上以光束照射所形成的光點之反射光，被沿著訊息軌跡方向以及與此訊息軌跡方向垂直之方向上分割成4塊之受光元件所接收時，可因應於個別之受光量而輸出4個電氣信號；以及第1及第2加算手段，可使該受光元件輸出之4個電氣信號之中，將對角方向的受光元件所輸出之電氣信號加算在一起；以及第3及第4加算手段，可使該受光元件所輸出之4個電氣信號之中，將對軌跡方向成垂直之前段及後段的受光元件所輸出之電氣信號加算在一起；以及第1相位誤差檢測手段，可將因應於第1及第2加算手段所輸出加算信號之間的時間差而變化的相位誤差信號檢測出來；以及第2相位誤差檢測手段，可將因應於第3及第4加算手段所輸出加算信號之間的時間差而變化的相位誤差信請先閲讀背面之注意事項再1. The paper size of the 1T line paper applies the Chinese National Standard (CNS) A4 specification (210X297 mm) 498322 Printed by the Consumer Property Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Invention Description U) The test circuit and low-pass filter are shared. When the phase error detection circuit and the low-pass filter after sharing are used in a time division manner, the circuit can be miniaturized and the power consumption can be reduced. In order to achieve the above-mentioned object, the invention described in the first patent application scope is a tracking error detection device. The tracking error detection device includes: a light receiving means for irradiating a light spot formed by a light beam on an information track of an information recording medium When the reflected light is received by the light receiving element divided into four along the direction of the message track and the direction perpendicular to the direction of the message track, four electrical signals can be output according to the individual light receiving amount; and the first and second The addition means can add the electrical signals output by the diagonal light receiving element among the four electrical signals output by the light receiving element; and the third and fourth adding means can make the electrical signals output by the light receiving element Among the four electrical signals, the electrical signals output by the light receiving elements before and after the vertical direction of the track are added together; and the first phase error detection means can output the signals corresponding to the first and second addition means. A phase error signal that changes by adding a time difference between the signals is detected; and a second phase error detection means, which can And the phase error signal that changes with the time difference between the added signals output by the fourth adding means, please read the note on the back first

訂線本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 498322 A7 B7 經濟部智慧財產局員工消費合作社印製五、發明説明（咎）號檢測出來，並且使該第1相位誤差檢測手段所輸出之相位誤差信號中的高域成分被除去；以及第1低域通過手段，可使顯示該訊息軌跡與光束之相對位置的追蹤誤差信號被檢測出來之，並且使該第2相位誤差檢測手段所輸出之相位誤差信號中的高域成分被除去；以及第2低域通過手段，可使補償信號在該追蹤誤差信號中被產生，其特徵爲：使該第1相位誤差檢測手段與該第2相位誤差檢測手段，以及使該第1低域通過手段與該第2低域通過手段被共用化，使用共用化之後的相位誤差檢測手段以及低域通過手段而檢測出該追蹤誤差信號及該補償信號。而申請專利範圍第2項之發明是，如申請專利範圍第1 項之追蹤誤差檢測裝置，另外具有一種選擇手段，它可使從該受光元件輸出之4個電氣信號被控制，可選擇使對角方向的受光元件所輸出之電氣信號加算在一起，或者使對軌跡方向成垂直之前段及後段的受光元件所輸出之電氣信號加算在一起。而’申請專利範圍第3項之發明是，如申請專利範圍第2項之追蹤誤差檢測裝置，其中該選擇手段是由數位信號處理器（DSP)而控制決定檢測追蹤誤差信號或者檢測補償信號用之切換信號的輸出。 (請先閱讀背面之注意事項再填寫本頁) 訂線' 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 498322 A7 B7 經濟部智慧財產局員工消費合作社印製五、發明説明（q ) 而，申請專利範圍第4項之發明是，一種追蹤誤差檢測裝置，其特徵爲具有：受光手段，在訊息記錄媒體之訊息軌跡上以光束照射，在訊息軌跡上產生之反射光’在沿著訊息軌跡方向以及與此訊息軌跡方向交叉之方向上分別具有至少分割成 2塊之受光領域，因應於對個別受光領域之照射光量而輸出電氣信號；及信號切換手段，它輸入該受光領域之預定第1組合所產生之至少兩個第1電氣信號，及與該受光領域之預定第1組合不同之第2組合所產生之至少兩個第2電氣信號，而輸出任何一方之組合所產生之電氣信號；及相位誤差檢測電路，它在接收該信號切換手段之輸出，在輸入的第1電氣信號之間，或者第2電氣信號之間，檢測出因應於時間差而變化的相位誤差信號；及低域通過手段，它接收該相位誤差檢測電路所輸出之相位誤差信號，將該信號中之高域成分除去，而使顯示該訊息軌跡與光束之相對位置的追蹤誤差信號被產生，而且，使該追蹤誤差信號中產生補償信號。如上述，依照本發明之追蹤誤差檢測裝置，其追蹤誤差信號及補償信號之檢測時，做爲追蹤誤差信號之檢測手段用之第1相位誤差檢測手段及第1低通濾波手段，與做爲補償信號檢測手段用的第2相位誤差檢測手段及 (請先閲讀背面之注意事項再填寫本頁) 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 498322 A7 B7 五、發明説明（f ) (請先閱讀背面之注意事項再填寫本頁) 第2低通濾波手段被共用化，使共用化之後的相位誤差檢測手段及低通濾波手段依照時間分割地方式而使用時，可達成電路的小型化及低消費電力化。圖式之簡單說明第1圖是本發明第1實施例中之追蹤誤差檢測裝置的方塊圖；第2圖本發明第1實施例中之追蹤誤差檢測裝置的動作波形圖；第3圖是顯示在追蹤誤差檢測時遠場圖型之變化；第4圖是顯示在追蹤誤差檢測時遠場圖型之變化；第5圖是顯示在追蹤誤差檢測時遠場圖型之變化；第6圖是顯示在補償信號檢測時遠場圖型之變化；. 第7圖爲追蹤誤差信號之波形圖；第8圖是產生補償信號之追蹤誤差信號的波形圖；第9圖是習知追蹤誤差檢測裝置的方塊圖。本發明較佳實施例之詳細說明經濟部智慧財產局員工消費合作社印製以下將參照圖面說明本發明第1實施例之追蹤誤差檢測裝置。 (實施例1) 第1圖是顯示本發明第1實施例中之追蹤誤差檢測裝置的構成圖。以下將使用第1圖來說明本發明第1實施例之追蹤誤差檢測裝置。 -10- 本纸張尺度適用中國國家標準（CMS ) A4規格（210X29?公釐） 498322 A7 B7 經濟部智慧財產局員工消費合作社印製五、發明説明（q ) 第1圖中，光點通過訊息坑上方時，光之繞射圖型（遠場圖型），受光領域以有4個分割之光檢測器i 〇進行檢測。光檢測器10具有田字型之4個分割之受光元件 1 a，1 b，1 c，1 d，可接收以光點照射在訊息記錄媒體之軌跡上所形成的訊息軌跡之反射光，因應於個別之入射光量而使光量被轉換成電氣信號，轉換後之各個信號由直流/交流變換器16a,16b,16c，16(1而分別地從類比信號轉換成數位信號。求出追蹤誤差信號之時，首先加算器12a所產生的受光元件la，lc之輸出信號之和，及加算器12b所產生的受光元件lb，Id之輸出信號之和分別被產生，選擇器 11a，lib根據數位信號處理器（DSP)17所產生之切換信號而分別地選擇受光元件所產生之輸出信號。即，以加算器12 a，12b而使對角方向之受光元件所產生的輸出信號被加算在一起。其次，分別求出的加算信號被輸入到相位誤差檢測電路1 3，在此處，相位被比較而求出相位誤差信號，所產生的相位誤差信號通過低域通過手段（low-pass filter) 14 而求得追蹤誤差信號。而’在求出補償信號時，加算器12a所產生的受光元件la，lb之輸出信號22k71和，及加算器12b所產生的受光元件lc，Id之輸出信號的和分別被產生，選擇器 11a，lib根據數位信號處理器（DSP)17所產生之切換信號 -11 - (請先閱讀背面之注意事項再填寫本頁)The paper size of the book is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm) 498322 A7 B7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. The invention description (blame) number is detected and the first phase error is caused The high-domain component of the phase error signal output by the detection means is removed; and the first low-domain pass means enables the tracking error signal showing the relative position of the message track and the light beam to be detected, and the second phase The high-domain component of the phase error signal output by the error detection means is removed; and the second low-domain pass means enables a compensation signal to be generated in the tracking error signal, which is characterized in that the first phase error detection means is And the second phase error detection means, and the first low-domain pass means and the second low-domain pass means are shared, and the tracking error is detected using the phase error detection means and low-domain pass means after sharing Signal and the compensation signal. The invention of the second scope of the patent application is, for example, the tracking error detection device of the first scope of the patent application. In addition, it has a selection means, which can control the four electrical signals output from the light receiving element, and can select the right The electrical signals output by the light-receiving elements in the angular direction are added together, or the electrical signals output by the light-receiving elements in the previous and subsequent stages are perpendicular to the track direction. The invention of item 3 of the scope of the patent application is, for example, the tracking error detection device of the scope of the second patent application, wherein the selection means is controlled by a digital signal processor (DSP) to determine the detection of the tracking error signal or the detection of the compensation signal. The output of the switching signal. (Please read the precautions on the back before filling this page) Thread setting 'This paper size applies to the Chinese National Standard (CNS) A4 specification (210X297 mm) 498322 A7 B7 Printed by the Consumers ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs (Q) The invention in item 4 of the scope of patent application is a tracking error detection device, which is characterized by: a light receiving means, which is irradiated with a light beam on an information track of an information recording medium, and reflected light generated on the information track ' There are light receiving areas that are divided into at least two blocks along the direction of the message track and the direction crossing the direction of the message track, and output electrical signals according to the amount of light irradiated to the individual light receiving areas; and a signal switching means, which inputs the light receiving At least two first electrical signals generated by a predetermined first combination in the field, and at least two second electrical signals generated by a second combination different from the predetermined first combination in the light receiving field, and the combination of either party is output. The electrical signal generated; and the phase error detection circuit, which receives the output of the signal switching means and A phase error signal that changes due to the time difference is detected between the 1 electrical signal or the 2nd electrical signal; and a low-domain pass means that receives a phase error signal output by the phase error detection circuit, and The high-domain component is removed, so that a tracking error signal showing the relative position of the message track and the light beam is generated, and a compensation signal is generated in the tracking error signal. As described above, when the tracking error detection device according to the present invention detects the tracking error signal and the compensation signal, the first phase error detection method and the first low-pass filtering method are used as the detection method of the tracking error signal, and as The second phase error detection method used for the compensation signal detection method and (please read the precautions on the back before filling in this page) This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) 498322 A7 B7 V. Description of the invention (F) (Please read the precautions on the back before filling in this page.) The second low-pass filtering method is shared. If the phase error detection method and low-pass filtering method are used in a time-divided manner after sharing, Achieve miniaturization of circuits and low power consumption. Brief Description of the Drawings Fig. 1 is a block diagram of a tracking error detection device in the first embodiment of the present invention; Fig. 2 is an operation waveform diagram of the tracking error detection device in the first embodiment of the present invention; Fig. 3 is a display Changes in the far-field pattern during tracking error detection; Figure 4 shows the changes in the far-field pattern during tracking error detection; Figure 5 shows the changes in the far-field pattern during tracking error detection; Figure 6 is Shows the change of the far-field pattern during the detection of the compensation signal; Figure 7 is the waveform diagram of the tracking error signal; Figure 8 is the waveform diagram of the tracking error signal that generates the compensation signal; Figure 9 is the conventional tracking error detection device Block diagram. Detailed description of the preferred embodiment of the present invention Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs The following will describe the tracking error detection device of the first embodiment of the present invention with reference to the drawings. (Embodiment 1) Figure 1 is a diagram showing a configuration of a tracking error detection device in a first embodiment of the present invention. Hereinafter, a tracking error detection device according to a first embodiment of the present invention will be described using FIG. -10- This paper size applies the Chinese National Standard (CMS) A4 specification (210X29? Mm) 498322 A7 B7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of the invention (q) In Figure 1, the light spot passes Above the message pit, the diffraction pattern of light (far-field pattern), and the light receiving area is detected by a light detector i 0 with 4 divisions. The photodetector 10 has field-shaped four divided light-receiving elements 1 a, 1 b, 1 c, and 1 d, and can receive reflected light of an information track formed by irradiating a light spot on the track of an information recording medium. The light quantity is converted into electrical signals based on the amount of incident light, and the converted signals are converted from analog signals to digital signals by DC / AC converters 16a, 16b, 16c, 16 (1, respectively. Find the tracking error signal At this time, first, the sum of the output signals of the light receiving elements la, lc generated by the adder 12a and the sum of the output signals of the light receiving elements lb, Id generated by the adder 12b are respectively generated. The selectors 11a, lib are based on the digital signals. The switching signal generated by the processor (DSP) 17 selects the output signals generated by the light receiving elements separately, that is, the output signals generated by the diagonal light receiving elements are added together by the adders 12 a and 12 b. Next, the separately obtained addition signals are input to the phase error detection circuit 13 where the phases are compared to obtain the phase error signal, and the generated phase error signal is passed through a low-domain pass means. low-pass filter) 14 to obtain the tracking error signal. 'When determining the compensation signal, the output signals 22k71 and of the light receiving elements la, lb generated by the adder 12a, and the light receiving element lc generated by the adder 12b, The sum of the output signals of Id is generated separately. The selector 11a, lib is based on the switching signal generated by the digital signal processor (DSP) 17-11-(Please read the precautions on the back before filling this page)

訂線· 本紙張尺度適用中國國家標準（CNS ) A4規格（21〇X：297公釐）經濟部智慧財產局員工消費合作社印製 498322 A7 __B7 五、發明説明（Μ ) 而分別地選擇受光元件所產生之輸出信號。即，以加算器12 a，12b而使對軌跡方向成垂直之前段及後段之受光元件所產生的輸出信號被加算在一起。其次，分別求出的加算信號被輸入到相位誤差檢測電路1 3，在此處，相位被比較而求出相位誤差信號，所產生的相位誤差信號通過低通濾波器14而求得補償信號。而在低通濾波器14中，爲了數位構成之故，對追蹤誤差信號、補償信號分別可用濾波器係數分攤或者設定。而，切換信號爲DSP所產生之輸出信號，用來決定檢測追蹤誤差信號，或者檢測補償信號。追蹤誤差信號，必須時常地檢測光點是否在軌跡上照射著，關於補償信號，光點在軌跡上之狀態下，透鏡之偏移所產生追蹤誤差信號之補償信號被檢測出之故，關於補償信號，不必時常地檢測也可以。因此，在許多次之中以一次之比例進行檢測的話，亦可調整補償之偏移，而可由切換信號決定檢測追蹤誤差信號，或者檢測補償信號。切換信號與DSP之關係，使用第2圖說明。首先，第 2(&)圖是03?17之內部信號，對03?17側，TE脈衝可檢測出追蹤誤差信號。而，TG脈衝是用來檢測補償信號用之決定信號。TG脈衝是以一定之間隔出現在TE脈衝之間。此時，切換信號是以（a)爲基準形成的信號，在U)之TG脈衝之一個前面之脈衝處，產生成爲HIGH、 -12- 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） (請先閱讀背面之注意事項再填寫本頁)Alignment · This paper size applies the Chinese National Standard (CNS) A4 specification (21 ×: 297 mm) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 498322 A7 __B7 V. Description of the invention (M) and the light receiving elements are selected separately The resulting output signal. That is, the output signals generated by the light receiving elements in the preceding and following stages are perpendicular to the track direction by the adders 12a and 12b, and are added together. Next, the separately obtained addition signals are input to the phase error detection circuit 13 where the phases are compared to obtain the phase error signal, and the generated phase error signal is obtained through the low-pass filter 14 to obtain the compensation signal. In the low-pass filter 14, for the sake of digital configuration, the tracking error signal and the compensation signal can be allocated or set with filter coefficients, respectively. The switching signal is an output signal generated by the DSP and is used to determine the detection of the tracking error signal or the detection of the compensation signal. For tracking error signals, it is necessary to constantly detect whether the light spot is irradiated on the track. Regarding the compensation signal, when the light spot is on the track, the compensation signal of the tracking error signal generated by the lens shift is detected. About compensation It is not necessary to detect the signal from time to time. Therefore, if the detection is performed at a ratio of many times, the offset of the compensation can also be adjusted, and the detection of the tracking error signal or the detection of the compensation signal can be determined by the switching signal. The relationship between the switching signal and the DSP will be described using FIG. 2. First, Figure 2 is the internal signal of 03-17. For the 03-17 side, the TE pulse can detect the tracking error signal. However, the TG pulse is a decision signal for detecting the compensation signal. TG pulses appear between TE pulses at certain intervals. At this time, the switching signal is a signal formed on the basis of (a), and it becomes HIGH, -12 at one of the preceding pulses of the TG pulse of U). -12- This paper size is applicable to China National Standard (CNS) A4 specification (210X297). Mm) (Please read the notes on the back before filling out this page)

498322 經濟部智慧財產局員工消費合作社印製 A7 __B7___五、發明説明（Η ) 其他之外、LOW之切換信號。然後，如（b)之ΤΕ、TG之分布，在追蹤誤差檢測裝置15中，切換信號是在HIGH 時檢測出補償信號，在LOW時則進行追蹤誤差信號之檢測。如以上所述方式，依照本實施例之追蹤誤差檢測裝置，由於從DSP 17所輸出之切換信號，在信號檢測時，可以時間分割的方式而使對追蹤誤差信號之檢測，或者是對補償信號之檢測進行切換，因而可使電路達成共用化，從而可達成電路之小型化及低消費電力化。產業上利用之可能性如以上所述，本發明之追蹤誤差檢測裝置，其追蹤誤差信號及補償信號之檢測時，做爲追蹤誤差信號之檢測手段用之第1相位誤差檢測手段及第1低通濾波手段，與做爲補償信號檢測手段用的第2相位誤差檢測手段及第2低通濾波手段被共用化，使共用化之後的相位誤差檢測手段及低通濾波手段依照時間分割地方式而使用時，可達成追蹤誤差檢測裝置之電路的小型化及低消費電力化。元件符號說明 TE，TG… 脈衝 1 a〜1 d… 受光元件 10··· 光檢測器 (請先閲讀背面之注意事項再填寫本頁) 訂線丨 nr 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 498322 A7 B7 五、發明説明（、>) 經濟部智慧財產局員工消費合作社印製 13… 相位誤差檢測電路 14… 低域通過手段 17… 數位信號處理器 1 la?l lb··· 選擇器 22… 訊息坑 23… 光點 12a,12b··· 加算器 3 1… 分割之感測器 16a 〜16d··· 直流/交流變換器 32… 光點 24〜27… 受光領域 6 2… 相位誤差檢測電路 6 3… 低通濾波器 64··· 相位誤差檢測電路 65… 低通濾波器 6 1 a, 6 1 b … 加算器 70a 〜70d··· 受光元件 -14- ----------— (請先閱讀背面之注意事項再填寫本頁)498322 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 __B7___ V. Description of the Invention (之外) Other than that, a LOW switching signal. Then, as in the distribution of TE and TG in (b), in the tracking error detection device 15, the switching signal is a compensation signal detected at HIGH, and a tracking error signal is detected at LOW. As described above, according to the tracking error detection device of this embodiment, due to the switching signal output from the DSP 17, when the signal is detected, the tracking error signal can be detected in a time division manner, or the compensation signal can be detected. The detection is switched, so that the circuit can be shared, and the circuit can be miniaturized and low power consumption. The possibility of industrial use is as described above. When the tracking error detection device of the present invention detects the tracking error signal and the compensation signal, it is the first phase error detection method and the first low detection signal detection means. The pass filtering means is shared with the second phase error detection means and the second low-pass filtering means used as the compensation signal detection means, and the phase error detection means and the low-pass filtering means after the sharing are used in a time-divided manner. In use, miniaturization of the circuit of the tracking error detection device and low power consumption can be achieved. Component symbol description TE, TG ... Pulse 1 a ~ 1 d ... Light receiving element 10 ... Photo detector (please read the precautions on the back before filling this page) Alignment 丨 nr This paper size applies to Chinese National Standard (CNS) A4 specifications (210X297 mm) 498322 A7 B7 V. Description of the invention (, &); Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 13 ... Phase error detection circuit 14 ... Low-range pass means 17 ... Digital signal processor 1 la? l lb ... selector 22 ... message pit 23 ... spot 12a, 12b ... adder 3 1 ... split sensor 16a ~ 16d ... DC / AC converter 32 ... spot 24 ~ 27 ... Light receiving area 6 2 ... Phase error detection circuit 6 3 ... Low-pass filter 64 ... Phase error detection circuit 65 ... Low-pass filter 6 1 a, 6 1 b ... Adder 70a to 70d ... Light receiving element-14 -----------— (Please read the notes on the back before filling this page)

、1T 線本紙張尺度適用中國國家標準（CNS ) Α4規格（210X297公釐）、 1T line This paper size applies to China National Standard (CNS) Α4 specification (210X297 mm)

Claims

498322 A8 B8 C8 D8 p6 'patent application scope 1. A tracking error detection device having: a light receiving means, reflected light of a light spot formed by light beam irradiation on an information track of an information recording medium, and is tracked along the information track When receiving in the direction and the light receiving element divided into four in the direction perpendicular to the direction of the message track, four electrical signals can be output according to the individual light receiving amount; and the first and second adding means can make the light receiving element Among the four electric signals output, the electric signals output by the light receiving elements in the diagonal direction are added together; and the third and fourth adding means can enable the four electric signals output by the light receiving element to be summed up. The electrical signals output by the light receiving elements before and after the track direction is vertical are added together; and the first phase error detection means can be changed according to the time difference between the added signals output by the first and second adding means. Phase error signal is detected; and the second phase error detection means can add the output signals corresponding to the third and fourth addition means. A phase error signal that changes with the time difference between them is detected, and the high-domain component of the phase error signal output by the first phase error detection means is removed; and the first low-domain pass means can display the message track The tracking error signal with respect to the relative position of the light beam is detected, and the high domain in the phase error signal output by the second phase error detection means is set to -15- This paper standard is applicable to the Chinese National Standard (CNS) A4 specification ( 2] OX 297 mm) --------- ^-(Please read the notes on the back before filling out this page), 1T + Printed by the Ministry of Economics, Smart Finance is an employee consumer cooperative of the Bureau 498322 ABCD Ministry of Economics Printed by Intellectual Property Co., Ltd. 4 employees' cooperatives. 6. The scope of patent application is removed; and the second low-domain pass means can make the compensation signal be generated in the tracking error signal. Its characteristics are: make the first phase error The detection means and the second phase error detection means, and the first low-domain pass means and the second low-domain pass means are shared, and the phase error detection after the sharing is used The tracking error signal and the compensation signal are detected by means and low-domain means. 2. For example, the tracking error detection device in the scope of patent application, there is also a selection means, which can control the four electrical signals output from the light receiving element, and can select the electrical output of the diagonal light receiving element. The signals are added together, or the electrical signals output by the light receiving elements before and after the vertical direction of the trajectory are added together. 03. For example, the tracking error detection device of the second patent application range, wherein the selection means is digital A signal processor (DSP) controls and determines the output of a switching signal for detecting a tracking error signal or detecting a compensation signal. A tracking error detection device is characterized by having: a light receiving means for Beam irradiation, the reflected light generated on the track of the message has at least -16- II---i 1 list 1_ Is In 沿着 along the direction of the track of the message and the direction crossing the direction of the track of the message ϋ (Please read first Note on the back, please fill in this page again) The size of the paper is applicable to the Chinese National Standard (CNS) Α4 specification (210χ 29 7mm) 498322 ABICD Six 'patent application range is divided into two light receiving areas, which output electrical signals in response to the amount of light irradiated to individual light receiving areas; and a signal switching means, which is generated by inputting a predetermined first combination of the light receiving areas At least two first electrical signals and at least two second electrical signals generated by a second combination different from the predetermined first combination of the light receiving field, and output the electrical signals generated by either combination: and phase error The detection circuit detects the phase error signal that changes due to the time difference between the first electrical signal or the second electrical signal after receiving the output of the signal switching means; and the low-pass method Receiving the phase error signal output by the phase error detection circuit, removing the high-domain components in the signal, so that a tracking error signal showing the relative position of the message track and the light beam is generated; and the tracking error signal is generated Compensation signal. m 1 I nn ϋ —ϋ ml V IT ϋ_ϋ mi-二-1-1 ^ 1 mu — ^ ϋ (Please read the precautions below and then fill out this page) Printed by the Consumers ’Cooperative of the 4th Bureau of Smart Finance, Ministry of Economic Affairs- 17- This paper size applies to China National Standard (CMS) A4 (210X29 "? mm)