TW451190B - Optical pickup device - Google Patents

Abstract

An optical pickup device which can obtain a stable reproduction signal by an increased numeric aperture of an objective lens. The optical pickup device includes an objective lens unit having an objective lens facing a disc and having a predetermined effective diameter and at least two auxiliary lenses provided in exterior sides of the objective lens for directing +1st-order diffracted light to a light path different from that of the light passing through the objective lens, a light source for irradiating light onto the disc through the objective lens, a light spliter interposed between the light source and the objective lens for directing the light reflected from the disc to a light path different from that from the light source, a photodetector for detecting the light reflected from the disc and travelled via the light splitter, and at least two diffracted light detectors for detecting diffracted light incident from the auxiliary lenses. Therefore, a hight reproduction signal and a stable track signal can be obtained.

Description

45119 ο A7 B7 五、發明説明（ <發明之範圍> 本發明係關於一種光學檢波器，尤特指利用在物鏡上 增設的一數字孔來獲得穩定的再生信號的一種光學撿波 器。 <：發明之背景> 光學檢波器可記錄並再生諸如視頻或聲頻等數據於光 學記錄媒介物或從其獲取該等數據，該媒介物即指碟片。 碟片在構造上係將其記錄面形成於基片上。例如基片可由 塑膠或破璃製成。為了要.從高密度的碟片讀或寫資料，光 點的直徑必須很小。為此目的，通常物鏡上的數字孔（以 下稱NA)製成較大型，而所用光源的波長則較短。如此則 當使用較短波長的光源時，碟片對光轴的容許傾斜度將减 小。這樣減小的碟片容許傾斜度可因減少碟片的厚度而辦 加。 胃 假定Θ為碟片的傾斜角，則偏饋波偏離率可由不 獲得： ' r ‘----^------訂----- -./t. c精先stl背面之anfc再填寫本耳) w 31 n2(n2-l)sinQcos9 _s (n2^sin20) 245119 ο A7 B7 V. Description of the invention (< Scope of invention >) The present invention relates to an optical detector, especially an optical pickup that uses a digital hole added to the objective lens to obtain a stable reproduction signal. <: Background of the invention > An optical detector can record and reproduce data, such as video or audio, on or from an optical recording medium, which is referred to as a disc. The disc is structured such that it The recording surface is formed on a substrate. For example, the substrate can be made of plastic or broken glass. In order to read or write data from a high-density disc, the diameter of the light spot must be small. For this purpose, usually a digital hole on the objective lens (Hereinafter referred to as NA) is made larger, and the wavelength of the light source used is shorter. In this way, when a light source with a shorter wavelength is used, the allowable tilt of the disc to the optical axis will be reduced. This reduced disc allows The inclination can be increased by reducing the thickness of the disc. The stomach assumes that Θ is the inclination angle of the disc, and the deviation of the bias feed can be obtained: 'r' ---- ^ ------ order- --- -./t. c first anfc on the back of stl, then fill in this ear) w 31 n2 (n2-l) sinQcos9 _s (n2 ^ sin20) 2

NA 3 諌 經濟部中央搮率為貝工消费合作社印製 上式中d與n各代表碟片的厚度與折射率。由上式的關係， 可知偏饋波偏離率與NA的三次才成正比。由是若設一傳統 的緊巧碟片（以下稱CD)所需物鏡的^^八為0.45,而傳 的數位视頻碟片或數位多用途碟片（以下稱DVD)的該值為 0.6，而DVD的偏饋波像差率為在一定的傾斜度下具有同樣 本紙張纽速用中國國家橾準（⑽）八4胁（210x1^^7 4 51 1 9 ο Α7 Β7 五、 迪奔年中夬揉率苟貝工滇費合作；fi印策 發明説明（3) 厚度的CD的該值的2.34倍。因此，DVD的最大容許傾斜度 可控制使其減少至傳統CD值的一半左右》為了使DVD的最 大容許傾斜度與CD者相符，DVD的厚度d可以減少》 在使用者的立場上’對於裝置一個與傳統碟片可相容 的高密度碟片乃甚為重要之事。是故因高密度而變更碟片 厚度將招致相應的球形偏離。如果球形偏離異常嚴重時， 在碟月上形成的光點無法具有記錄資訊所需光強度，此將 妨礙資訊的正確記錄。同時，在資訊再生期間，偉號對噪 音比(以下稱S/N)將太低而致無法主確再生所記錄的資訊。 最後’可相容的檢波器可用來讀取昇有不同厚度的碟 片，諸如CD或DVD，乃屬必要的。 傳統的可相容檢波器所用一種全像(hologram)鏡片如 (如日本專利公開公報平7-98431號）採用兩片物鏡，或一 種物理性孔膜（如美國專利第5,281,797號），由於這些傳統 的可相容檢波器須要附加的組件；製造成本亦因而增加。 另外’高密度碟片，如DVD具有的軌距與軌痕遠小於 傳統00者。又因DVD的調變程度較之CD減少35%以上， 所以想得到穩定的聲跡信號是有困難的。尤其是DVD，如入 射光束在再生資訊期間，對物鏡中心偏離，亦即如發生光 束偏位’光學調變作用不能超越繞射限制曲線。 <發明之總論> 本發明之目的在提供一經改進之光學檢波器，其可藉 偵測做為聲跡補償信號反射向碟片的±第一階繞射光獲得 W 峨用 (CNS) ί ^^1 ^^1 m ^^1 n« n ^^1 ^^1 in m J n· ^^1 ^^1 (請先《讀背面之注$項再蜞寫本頁) 4 5119 0 A7 B7 五、發明説明（j) 一穩定的再生信號及伺服信號，該器可採用具有阻擋光線 機構的物鏡及另一傳統的物鏡。 為了達成上揭目的，本發明所提供的光學檢波器包括 .一物鏡組’其具有一面對碟片的物鏡，並具有一預設定有 效直徑與至少兩個在物鏡外端的輔助鏡月，用以引導土第 一階的繞射光入於與經過物鏡光線不同的路徑，一光源用 以經物鏡照射其光線於碟片，一夾於光源與物鏡間的分光 器’用以引導從碟片反射過來的光線進入與光源光線不同 的路徑，一光偵測器用以偵測自碟片反射而來且經過分光 器的光線，及至少兩具繞射光偵測器，用以偵測從輔助鏡 片入射而來的繞射光β <圖示之簡單說明> 上揭有關本發明之目的與優點，可就下述之較佳具體 實施例’參照所附囷示所做詳細之敘述而更能明瞭： 第1囷為本發明第一具體實施例中光學檢波器冬構成 第2囷為本發明第二具體實施例中光學檢波器之構成 ΠΕ} · 圃， 第3圖為本發明第二具體實施例中光學檢波器所用之 物鏡之正面構成圖； 第4圖為本發明第三具體實施例中光學檢波器所用之 物鏡之側面構成囷； 第5囷為本發明光學檢波器所用四片光偵測器之平面 圍， 本紙張尺度適用中國国家^^NS)M規格Ο丨㈣㈣楚） ----------裝— <請先聞讀背面之注$項再填寫本頁) 订 4 5119 0 A7 B7 五、發明説明（4 ) 第6圖及第7圖表示依碟片形式之不同而形成在第5 囷之四片光偵測器上之光點形狀； 第8困為本發明之光學檢波器所用八片光偵測器之平 面圖； 第9圖第11圖表示依物鏡與薄碟片間之距離不同而形 成在第8圖之八片光偵測器上之光點形狀； 第12至第14圖表示依物鏡與厚碟片間之距離不同而％ 成在第8圖之八片光偵測器上之光點形狀；及 第15圖為本發明光學檢波器光調變作用之說明用曲線 囷。 <圖式中元件名稱與符號對照> (請先聞讀背面之注$項再填寫本頁) '裝· 經濟部中央揉準局員工消費合作社印裝 200 :物鏡組 210 :物鏡 220 :總制麟 230 :辅助鏡片 240 :第二光控制機構 300:碟片 400 :分光器 她：偏極縫 5〇〇 =偵測鏡片 600 :光伯測器 610A、610B :輔助光俱測器 611 :第一偵測區域 612 :第二债測區域 651:.光點的中央部份 652 :中間部份 653 ::邊緣部份 8〇〇 :光源 801 :照準用鏡片 900 ··波長盤 Al、B】、C1、D1 :第一受光元件 60卜602、603、604··姻元件第二受光元件 <較佳具體實施例之詳細描述> 訂NA 3 搮 The central unit of the Ministry of Economic Affairs is printed by the Shellfish Consumer Cooperative, where d and n each represent the thickness and refractive index of the disc. From the relationship of the above formula, it can be seen that the deviation rate of the offset feed is proportional to the third order of NA. Therefore, if the objective lens required for a conventional compact disc (hereinafter referred to as CD) is set to 0.45, and the value of a digital video disc or digital versatile disc (hereinafter referred to as DVD) is 0.6, And the aberration rate of the biased feed of the DVD has the same paper at a certain inclination. The national standard of China (用) eight 4 threats (210x1 ^^ 7 4 51 1 9 ο Α7 Β7) The cooperation rate between the Chinese and Japanese partners is the cooperation of Fibonacci and Fi; the invention of Fi Yinze explains (3) the value of the thickness of the CD is 2.34 times. Therefore, the maximum allowable tilt of the DVD can be controlled to reduce it to about half of the traditional CD value. " In order to make the maximum allowable tilt of the DVD match the CD, the thickness d of the DVD can be reduced. From the user's standpoint, 'it is very important to install a high-density disc compatible with conventional discs. Therefore, changing the thickness of the disc due to high density will cause a corresponding spherical deviation. If the spherical deviation is abnormally serious, the light spots formed on the disc cannot have the light intensity required to record information, which will prevent the correct recording of information. At the same time, During the information regeneration period, the Weihao to noise ratio (hereinafter referred to as S / N) will Too low to accurately reproduce the recorded information. Finally, 'compatible detectors can be used to read discs with different thicknesses, such as CD or DVD, which is necessary. Traditional compatible detectors A hologram lens such as (for example, Japanese Patent Laid-Open Publication No. Hei 7-98431) uses two objective lenses, or a physical aperture film (such as U.S. Patent No. 5,281,797) due to these conventional compatible detectors Additional components are required; the manufacturing cost is also increased. In addition, 'high-density discs, such as DVDs, have a track pitch and track marks that are much smaller than those of traditional 00. Because the modulation degree of DVDs is reduced by more than 35% compared to CDs, so I want to get It is difficult to stabilize the sound track signal. Especially for DVD, if the incident beam is deviated from the center of the objective lens during the reproduction information, that is, if the beam deflection occurs, the optical modulation cannot exceed the diffraction limit curve. ≪ Invention of Summary > The purpose of the present invention is to provide an improved optical detector that can be obtained by detecting as the soundtrack compensation signal and reflecting the ± first-order diffracted light of the disc toward the disc (CNS). ^^ 1 ^^ 1 m ^^ 1 n «n ^^ 1 ^^ 1 in m J n · ^^ 1 ^^ 1 (please first read the note on the back and then write this page) 4 5119 0 A7 B7 V. Description of the invention (j) a Stable reproduction signal and servo signal, the device can use an objective lens with a light blocking mechanism and another traditional objective lens. In order to achieve the purpose of the disclosure, the optical detector provided by the present invention includes an objective lens group which has a face The objective lens of the disc has a preset effective diameter and at least two auxiliary lens moons at the outer end of the objective lens to guide the first-order diffracted light of the soil into a path different from the light passing through the objective lens. A light source is used to pass the objective lens. The light beam is irradiated on the disc. A beam splitter sandwiched between the light source and the objective lens is used to guide the light reflected from the disc into a different path from the light source. A light detector is used to detect the reflection from the disc. And the light passing through the beam splitter and at least two diffractive light detectors are used to detect the diffracted light incident from the auxiliary lens β < simple description of the diagram > The object and advantages of the present invention are disclosed above, Reference may be made to the attached preferred embodiments for the following preferred embodiments. The detailed description made is more clear: the first one is the structure of the optical detector in the first embodiment of the present invention, and the second one is the structure of the optical detector in the second embodiment of the present invention. FIG. 3 is a front view of the objective lens used in the optical detector in the second embodiment of the present invention; FIG. 4 is a side view of the objective lens used in the optical detector in the third embodiment of the present invention; Invented the plane circumference of the four photodetectors used in the optical detector. The paper size is applicable to China's national standard ^^ NS) M specifications 〇 丨 ㈣㈣ 楚) ---------- installation-< read first Note $ item on the back, please fill in this page) Order 4 5119 0 A7 B7 V. Description of the invention (4) Figures 6 and 7 show the four photodetectors formed on the fifth one according to the disc format. The shape of the light spot on the top; Figure 8 is a plan view of the eight photodetectors used in the optical detector of the present invention; Figure 9 and Figure 11 show the difference between the objective lens and the thin disc formed in Figure 8 Light spot shapes on eight photodetectors; Figures 12 to 14 show the distance between the objective lens and the thick disc Differently, the light spot shapes are formed on the eight photodetectors in Fig. 8; and Fig. 15 is a curve 囷 for explaining the light modulation effect of the optical detector of the present invention. < Comparison of component names and symbols in the drawings > (Please read the note on the back before filling in this page) 'Installation · Printed by the Consumer Cooperatives of the Central Bureau of the Ministry of Economic Affairs 200: Objective lens group 210: Objective lens 220: General system 230: auxiliary lens 240: second light control mechanism 300: disc 400: beam splitter she: polarized slit 500: detection lens 600: optical detector 610A, 610B: auxiliary optical detector 611 : The first detection area 612: the second debt measurement area 651: the central portion 652 of the light spot: the middle portion 653 :: the edge portion 800: the light source 801: the collimating lens 900 ·· wavelength plate Al, B], C1, D1: the first light receiving element 60, 602, 603, 604 ·· marriage element the second light receiving element < detailed description of the preferred embodiment >

.I — H 咏張尺度制中準（CNS ) A4規格U]GX297公徒〜 451 1 9〇 經濟部t央標準局員工消費合作社印裂 A7 B7 五、發明説明（r) 請參照第1圊，面對著碟片300的物鏡組200具有一物 鏡210 ’而在其周邊有一光控制機構220，及一位於光控制 機構220外面的辅助鏡片230。一光偵測器600位於物鏡210 的光路徑中，係用以偵測通過物鏡210的光線。一分光器400 '及一偵測鏡片500則依次位於物鏡組200與光偵測器600之 間。一光源800，諸如一雷射二極體者位於分光器400所折 射之光路徑中。輔助光偵測器610A與610B設於光偵測器600 的外側，用於偵測來自輔助鏡230的光線，如此的構成者， 如輔助鏡片，依折射原理之全像(hologram)鏡片及一般折射 鏡均可採用。 第2圊為本發明第二具體實施例中光學檢波器之構成 圖。 於此實施例中，與第一實施例相反，其光源800與物鏡組 200係置於直線光路徑中。如第3圊所示，物鏡組200中含 有物鏡210 ’ 一光控制機構220環繞物鏡210,及一輔辟鏡片 230，安置於光控制機構220側。用以偵測從輔助鏡片230發 射的光線的輔助光偵測器610Α與610Β則位於光源800的外 側。一波長盤900與一偏極縫400a位於光源800與物鏡組200 之間》光偵測器600位於偏極缝400a繞射的路徑中。一偵測 鏡片500介於偏極缝400a與光偵測器600之間》—照準用鏡 片801位於偏極縫400a與光源800之間，用以收聚光源800發 射之光於焦點。光源800之外側有一輔助偵測機構。 每一上揭二具體實施例中，自光源800發射的光及從碟片 300反射而來的零階繞射光均經過物鏡21〇,而±第一階反 8 本紙乐尺度適用中國囷家梯準（CNS ) A4現格（210x297公釐} ί *_ n ~ί.— n I I n ^ n HI It (請先《讀背面之注—項再填寫本頁).I — H Yong Zhang scale system standard (CNS) A4 specifications U] GX297 male ~ 451 1 90. Ministry of Economic Affairs t Central Standards Bureau employee consumer cooperative printing A7 B7 V. Description of the invention (r) Please refer to Section 1 圊The objective lens group 200 facing the disc 300 has an objective lens 210 ′ and a light control mechanism 220 at its periphery, and an auxiliary lens 230 located outside the light control mechanism 220. A light detector 600 is located in the light path of the objective lens 210 and is used to detect light passing through the objective lens 210. A beam splitter 400 'and a detection lens 500 are sequentially located between the objective lens group 200 and the light detector 600. A light source 800, such as a laser diode, is located in the light path refracted by the beam splitter 400. Auxiliary light detectors 610A and 610B are provided outside the light detector 600 and are used to detect light from the auxiliary lens 230. Such constituents, such as auxiliary lenses, hologram lenses based on the principle of refraction, and general Refractive mirrors can be used. Fig. 2 is a configuration diagram of an optical detector in the second embodiment of the present invention. In this embodiment, contrary to the first embodiment, the light source 800 and the objective lens group 200 are placed in a linear light path. As shown in FIG. 3 (a), the objective lens group 200 includes an objective lens 210 ', a light control mechanism 220 surrounding the objective lens 210, and an auxiliary lens 230, and is disposed on the light control mechanism 220 side. The auxiliary light detectors 610A and 610B for detecting the light emitted from the auxiliary lens 230 are located outside the light source 800. A wavelength plate 900 and a polarizing slit 400a are located between the light source 800 and the objective lens group 200. The light detector 600 is located in a diffraction path of the polarizing slit 400a. A detection lens 500 is located between the polarized slit 400a and the light detector 600. The sighting lens 801 is located between the polarized slit 400a and the light source 800 to collect the light emitted from the light source 800 at the focus. An auxiliary detection mechanism is provided outside the light source 800. In each of the above two specific embodiments, the light emitted from the light source 800 and the zero-order diffraction light reflected from the disc 300 pass through the objective lens 21, and the ± first-order anti-8 paper scale is applicable to the Chinese family ladder Standard (CNS) A4 (210x297 mm) ί * _ n ~ ί. — N II n ^ n HI It (please read the note on the back—item before filling this page)

A7 B7A7 B7

五'發明说明（z) 射自碟片300之繞射光經過輔助鏡片230。此時，士第一階 繞射光部份通過物鏡210的邊緣。是故反射自碟片300的零 階繞射光經過物鏡210後，再通過分光器400a而到達光偵測 器600。該士第一階折射光，經辅助鏡片230後到達輔助光 偵測器610A與610B。 經光偵測器600所偵測的零階繞射光及經輔助光偵測器 610A與610B所偵測的士第一階繞射光在加法器（未標示） 中相加後可用做再生信號。由一輔助光偵測器610A所偵測 的”一"第一階繞射光與由另一辅助光偵測器610B所偵測 的、+ 〃第一階繞射光之差值則用做聲跡信號。 如上文所述，本發明之光學檢波器如使用反射自碟片 300的士第一階繞射光，所得控制信號與再生信號，較之傳 統僅使用通過一個物鏡的光為信號源者，有更大之穩定 性。 如上揭之依本發明之光學檢波器，其輔助鏡片及輔助 光偵測器可裝設於任何地方’而不受上揭實施例之限制。 同時該物鏡，輔助鏡片及光控制機構可以由任何材料製 成，而均能達成本發明之目的。 物鏡組200包含一第二光控制機構，用以控制（即阻擋、 分散或吸收)那些經過物鏡210的光束中在近轴與遠軸間之中 間區域的光束，致使資訊可自兩個具有不同厚度的碟片寫 下或讀取。 ' " 如同上文所描述，依本發明的光學檢波器，可乒同使 用於兩個碟片者，係裝有一個物鏡組（將於後文述及）， (請先聞讀背面之注f項* .裝-- -¾本頁) T J's -線 0Fifth invention description (z) The diffracted light emitted from the disc 300 passes through the auxiliary lens 230. At this time, the first-order diffracted light passes through the edge of the objective lens 210. It is because the zero-order diffracted light reflected from the disc 300 passes through the objective lens 210 and then passes through the beam splitter 400a to reach the light detector 600. The taxi's first-order refracted light passes through auxiliary lens 230 and reaches auxiliary light detectors 610A and 610B. The zero-order diffracted light detected by the light detector 600 and the taxi first-order diffracted light detected by the auxiliary light detectors 610A and 610B can be used as a regeneration signal after being added in an adder (not labeled). The difference between "a" first-order diffracted light detected by an auxiliary light detector 610A and + 〃 first-order diffracted light detected by another auxiliary light detector 610B is used as sound As described above, if the optical detector of the present invention uses the first-order diffracted light reflected from the disc 300 taxi, the obtained control signal and reproduced signal are compared with those using only light passing through an objective lens as the signal source. , Has greater stability. The optical detector according to the present invention disclosed above, its auxiliary lens and auxiliary light detector can be installed anywhere 'without being restricted by the embodiment disclosed above. At the same time, the objective lens, auxiliary The lens and the light control mechanism can be made of any material and can achieve the purpose of the present invention. The objective lens group 200 includes a second light control mechanism for controlling (ie blocking, dispersing or absorbing) those light beams passing through the objective lens 210. The light beam in the middle area between the paraxial axis and the far axis allows information to be written or read from two discs with different thicknesses. '&Quot; As described above, the optical detector according to the present invention can be pinged. Used in both Sheet by, the objective lens system is provided with a group (to be mentioned later), (f Note Please read smell * The backside of the package -. -¾ page) T J's - line 0

經濟部中央標準局負工消费合作社印$L 本紙依尺度逆用中0國家搮準{〇阳）六4風格（21〇乂297公疫） 151190 A7 B7 :修正 經濟部亡央櫺率局黃工消费合作杜印聚 五、發明説明（7 ) 而其整體結構在第一及第二具體實施例中，該物鏡組與光 偵測器分別為一物鏡組及一光偵測器所取代，此將於後文 中述及。 第3圖表示本發明第二具體實施例中光學檢波器所用 物鏡之構成圖。 在物鏡組中，具備環繞於物鏡210的第一光控制機構 220，具有預設數字孔0.6，及一安置於光控制機構構220外 圍的一輔助鏡片230,其結構與第一實施例中之物鏡組者相 同。此外在此實施例中具有一環型的第二光控制機構240,其 具有一預設的直徑在物鏡210的光通過面内。第二光控制機 構240控制（即阻擋、分散或吸收）那些經過物鏡210的光 束中在近轴與遠軸間之中間區域的光束。 在此實施例中，光路徑中心軸外圍的光，亦即在近軸 與遠轴間之中間區域之光被控制，亦即被阻擋或遮蔽而形 成一小光點，由此中間區域的光干涉受其壓制。為此目 的，沿入射光路徑的近轴與遠軸間的中間區域設有環型或 正方形的光控制機構，用以控制（即阻擋或分散）光線。 這所應用的一個事實乃在遠轴區域的光線不會影響到中央 部位的光線，但在中間區域的光線則會有影響。於此近軸 區域係指包圍鏡片中心轴（光轴）的區域’其偏離則大致 可以忽略，而遠軸區域乃指距離光軸較遠之區域’至於中 間區域則指介於近軸與遠軸間之區域V 。 依據本發明第三實施例之光學檢波器’係採用物鏡組 2〇〇，具有光偵測器用以選擇性的偵測當資訊由厚碟片（1.2 10 本紙張纽财目g家縣（CNS )训身（21Qx297公瘦） (請先Μ讀背面之注^Printed by the Central Laboratories of the Ministry of Economic Affairs and Consumer Cooperatives. $ L This paper is used in accordance with the standards of the 0-country standards (0-yang), 64-style (21-0,297 public epidemic) 151190 A7 B7: Amendment to the Ministry of Economic Affairs Industrial and consumer cooperation Du Yinju 5. Description of the invention (7) The overall structure in the first and second embodiments is that the objective lens group and the light detector are replaced by an objective lens group and a light detector, respectively. This will be discussed later. Fig. 3 is a diagram showing the configuration of an objective lens used in an optical detector in a second embodiment of the present invention. The objective lens group includes a first light control mechanism 220 surrounding the objective lens 210, a preset digital aperture 0.6, and an auxiliary lens 230 disposed on the periphery of the light control mechanism structure 220. The structure is the same as that in the first embodiment. The objective lens group is the same. In addition, in this embodiment, there is a ring-shaped second light control mechanism 240 having a preset diameter in the light passing plane of the objective lens 210. The second light control mechanism 240 controls (i.e., blocks, disperses, or absorbs) the light beams in the middle region between the paraxial axis and the far axis of the beams passing through the objective lens 210. In this embodiment, the light around the central axis of the light path, that is, the light in the middle region between the paraxial axis and the far axis, is controlled, that is, blocked or blocked to form a small light spot, so the light in the middle region Interference is suppressed by it. For this purpose, a ring-shaped or square-shaped light control mechanism is provided along the middle region between the near axis and the far axis of the incident light path to control (ie block or disperse) light. The fact that this applies is that the light in the far axis area will not affect the light in the central part, but the light in the middle area will have an effect. Here, the paraxial area refers to the area surrounding the central axis (optical axis) of the lens, and its deviation can be ignored, while the far-axis area refers to the area farther from the optical axis. The area V between the axes. The optical detector according to the third embodiment of the present invention uses an objective lens set 200, and has a light detector for selective detection when the information is composed of a thick disc (1.2 10 papers New Zealand g home county (CNS) ) Training (21Qx297 male thin) (Please read the note on the back first ^

項D -裝-- 寫本I) 、1ΤItem D-Pack-Copybook I), 1T

-線 C 451 1 90 A7 B7-Line C 451 1 90 A7 B7

M濟部中央標孪局負工消费合作社印装 五、發明説明（g ) mmCD)讀取時通過第二光控制機構240的光，而當資訊由薄 碟片（0.6niinDVD)讀取時則偵測通過物鏡210的光。如此的光 偵測器採用傳統的四片光偵測器’即如第5圖所示者。在 光偵測器600中央形成的一光點具有四個偵測元件601、 602、603與604,則如第6圖與第7圊所示者，依碟片的厚度 而異。 第6圖所示者為當採用較厚的碟片（1.2minCD)時在光偵測 器600所形成光點的形狀。而第7圖所示者則為當採用較薄 的碟片（0.6醒DVD)時在光偵測器600所形成光點的形狀。由 近軸區域的光所產生的光點的中央部份651其直徑經一小變 動，但與碟片厚度無關。但中間部份652與邊緣部份653的直 徑則變動甚大。 換言之，如第6圖所示，光點的中央部份651位於光偵 測器600與邊緣部份653的中央，而該邊緣部份653則環繞光 偵測器600 »介於中央部份651及邊緣部份653間之中間部份 652乃 '"一 〃第一光控制機構所造成的除光部份❶換言之當 資訊再生自厚碟片（1.2臟之碟片）時，中央部份的2及^緣; 份653將因球型偏離而大為增大以致只有近軸區域亦即光 點中央部份651的光才可利用。 又如第7圖所示，中央部份651及邊緣部份653兩者均 在光镇測器600之偵測平面上形成。換言之當資訊再生自薄 (0.6酬)碟片時，近轴與遠轴兩區的所有光線，除了被光控制 組件移去的中間部份的光均被使用。於此，中央部份651的 直徑維持於相同的水準而與碟片形式無關。 11 {請先聞讀背面之注意事項再本頁)Printed by the Ministry of Economic Affairs, Central Bureau of Standards, Consumer Cooperatives. 5. Invention Description (g) mmCD) Reads light through the second light control mechanism 240, and when information is read by a thin disc (0.6niinDVD). The light passing through the objective lens 210 is detected. Such a photodetector uses a conventional four-chip photodetector ', as shown in FIG. 5. A light spot formed in the center of the photodetector 600 has four detection elements 601, 602, 603, and 604, as shown in Figs. 6 and 7), depending on the thickness of the disc. Figure 6 shows the shape of a light spot formed on the photodetector 600 when a thicker disc (1.2minCD) is used. Figure 7 shows the shape of a light spot formed on the photodetector 600 when a thinner disc (0.6 DVD) is used. The diameter of the central portion 651 of the light spot generated by the light in the paraxial region undergoes a small change in diameter, irrespective of the thickness of the disc. However, the diameters of the middle portion 652 and the edge portion 653 vary greatly. In other words, as shown in FIG. 6, the central portion 651 of the light spot is located between the photodetector 600 and the edge portion 653, and the edge portion 653 surrounds the light detector 600 »between the central portion 651 The middle part 652 between the edge part 653 and the edge part 653 is the "light elimination part caused by the first light control mechanism". In other words, when the information is reproduced from a thick disc (1.2 dirty disc), the central part The 2 and ^ edge of the element; 653 will be greatly increased due to the spherical deviation, so that only the light in the paraxial region, that is, the central portion 651 of the light spot, is available. As shown in FIG. 7, both the central portion 651 and the edge portion 653 are formed on the detection plane of the optical ballast 600. In other words, when the information is reproduced from a thin (0.6 pay) disc, all light in both the paraxial and far-axis areas, except for the light in the middle part removed by the light control unit, is used. Here, the diameter of the central portion 651 is maintained at the same level regardless of the disc form. 11 (Please read the notes on the back first, then this page)

訂 本纸狀賴財鮮（CNS ) Α4ίί>#7210Χ297^|Γ) 45119 0 Α7 Β7 修正 献Binding Paper Lai Caixian (CNS) Α4ίί ># 7210Χ297 ^ | Γ) 45119 0 Α7 Β7 Amendment

Jej 經濟部令央樣準局Μ工消費合作社印策 五、_發明说明（Q ) 如上文所述，為了讀取來自兩個不同厚度的碟片的資 訊，依本發明的光學檢波器採用其研發的光偵測器800以便 在讀取來自厚碟片的資訊時只接受近軸區域的光。而在讀 取來自薄碟片的資訊時則接受近軸與遠轴區域的光。因此 當使用厚碟片時可得相應於近軸區域光的信號，而使用薄 碟片時可得相應於近軸與遠軸區域光的較高信號。 光偵測器亦可採用其他形式，如第8圖所示者。第8 圖所示光偵測器600具有的結構為在第5圖的光偵測器周圍 加裝第二偵測區域"換言之在此實施例中的光偵測器600包 含位於中央的第一偵測區域611，及位於第一偵測區域611周 圍的第二偵測區域612。第一偵測區域6Π包含四個正方的 第一受光元件Ai、Bi、Ci與Di。第二偵測區域612包含四 個L型的第二受光元件A2、B2、C2與D2，包圍著第一債 測區域的第一受光元件Ai ' Bi、Ci與Di。 第9至第11圖表示當使用薄碟片（DVD)時光偵測器的受 光狀態。第12至第14圖表示當使用厚碟片（cd)時光偵測器 的受光狀態。 具有上揭結構的光偵測器中，整個信號，亦即來自第 一與第二偵測區域的信號均使用以讀取來自薄碟片的資 讯，而只有來自第一偵測區域的信號用以讀取來自厚碟片 的資訊。 如上文所述，依本發明的光學檢波器，由光偵測器6〇〇 偵測的一零階繞射光信號與由辅助光偵測器61〇八與61〇8偵 測的v —+〃第一階繞射光信號在加法器（未標示）中相 請 先 聞 讀 背 面 之 ϋ 裝 頁 訂 U線 12 本紙伕尺度適用中國國家揉準（CNS > Α4規格（210Χ297公楚） 451190 A7 B7 修正 献切年 五 、發明説明（幻） 加:做為再生信號。同時由另一輔助光偵測器6i〇b所偵測 的、、一"第一階繞射光信號與由一辅助光偵測器61〇a所偵 測的#第一階繞射光信號之差值則用做聲跡信號。由 是可獲得一高再生信號及一穩定聲跡信號。結果如第丨5圖 所示，本發明光學檢波器的一可做再生信號指標的本细松 作用值(B)較之傳統的光學檢波器之該值(A)大為增加 又田 為具有一物鏡之故，控制介於近轴與遠轴區域之光所用第 一光控制機構，可共同使用一 DVD ’而不必做任何型式的變更e 個0.6 m η 先 閲 讀 背 之 注 I 項 再Jej, Ministry of Economic Affairs, Central Samples and Standards Bureau, M Industrial Consumer Cooperative, Co., Ltd. V. _ Description of Invention (Q) As mentioned above, in order to read information from two discs of different thickness, the optical detector according to the present invention uses its The photodetector 800 was developed to accept only light in the paraxial region when reading information from thick discs. When reading information from a thin disc, light is received in the paraxial and far-axis regions. Therefore, when a thick disc is used, a signal corresponding to light in the paraxial region is obtained, and when a thin disc is used, a higher signal corresponding to light in the paraxial and far-axis regions is obtained. The light detector can also take other forms, as shown in FIG. 8. The photodetector 600 shown in FIG. 8 has a structure in which a second detection area is added around the photodetector in FIG. 5. In other words, the photodetector 600 in this embodiment includes a A detection area 611 and a second detection area 612 located around the first detection area 611. The first detection area 6Π includes four square first light receiving elements Ai, Bi, Ci, and Di. The second detection area 612 includes four L-shaped second light-receiving elements A2, B2, C2, and D2, and surrounds the first light-receiving elements Ai 'Bi, Ci, and Di of the first debt detection area. Figures 9 to 11 show the light receiving state of the photodetector when a thin disc (DVD) is used. Figures 12 to 14 show the light receiving state of the photodetector when a thick disc (cd) is used. In the photodetector with a lifted structure, the entire signal, that is, the signals from the first and second detection areas are used to read information from the thin disc, and only the signal from the first detection area is used. Used to read information from thick discs. As described above, according to the optical detector of the present invention, a zero-order diffracted light signal detected by the photodetector 600 and a v — detected by the auxiliary photodetectors 6108 and 6108. 〃The first-order diffracted light signal is added in the adder (not marked). Please read the back side first. Binding and binding U line 12 This paper is sized for China National Standards (CNS > Α4 (210 × 297)) 451190 A7 B7 Revised year 5. Description of invention (magic) Add: as a regeneration signal. At the same time, the first-order diffracted light signal detected by another auxiliary light detector 6i0b and the auxiliary The difference of the # first-order diffracted light signal detected by the light detector 61〇a is used as the sound track signal. Thus, a high reproduction signal and a stable sound track signal can be obtained. The results are shown in FIG. 5 It is shown that the value (B) of the optical looseness of the optical detector of the present invention which can be used as an index of the reproduction signal is greatly increased compared with the value (A) of the conventional optical detector. The first light control mechanism for light in the paraxial and far-axis regions can use a DVD 'together without having to Any type of a 0.6 m η e changes to read back the item and then injection I

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線 3 (V 經濟部中央標準局男工消费合作·社印^ 3 1Α 通 一釐 9 2Line 3 (V Men's Workers' Consumer Cooperatives, Social Printing, Central Bureau of Standards, Ministry of Economic Affairs ^ 3 1Α Tong Yili 9 2

Claims (1)

4 5119ο AS B8 C8 D8 修正 申請專利範圍 經濟部中央揉準局wc工消费合作社印製 1. 一種光學檢波器，其中包括： —物鏡植’含有一面對碟片的物鏡，其具有一預設定的 有效直徑’及至少兩個輔助鏡片位於該物鏡外側，用以 引導+第一階繞射光入於與經過物鏡光線不同的路徑； 一光源可經物鏡照射其光線於該碟片； 一爽於該光源與該物鏡間的分光器，用以引導從該碟片 反射過來的光線進入與該光源光線不同的路徑； 一光债測器’用以偵測自該碟片反射而來且經過該分光 器的光線；及 至少二具繞射光偵測器，用以偵測從該輔助鏡片入射而 來的繞射光》 2. 如申請專利範圍第1項所述之光學檢波器，其中所述光源 與物鏡位於直線的光路徑中，而該光偵測器位於該分光器 所繞射的路徑中。 3. 如申請專利範圍第1項所述之光學檢波器^其中所述物鏡 及光偵測器位於直線的光路徑中，而該光源位於該分光器 所繞射的路徑中。 4. 如申請專利範圍第1項或第2項或第3項所述之光學檢波 器’其_所述辅助鏡片屬於基於繞射原理之全像鏡片。 5. 如申請專利範圍第1項或第2項或第3項所述之光學檢波 器’其中所述物鏡及輔助鏡片為一體成型者。 6·如申請專利範圍第1項或第2項或第3項所述之光學檢波 器’其中更有一用以防止入射至物鏡之光的傳送之第一光 控制機構設置於該物鏡與輔助鏡片之間' 本紙》尺度適用中國國家標率（CNS ) A4规格（210X297公釐） (請先闔讀背面之注$¥ 裝-- 寫本頁) 、嗲" —線 C 5 4 經濟部中央樣率局貝工消费合作社印装 ^ g q ss C8 —______D8 : '申請專利範圍 7·如申請專利範圍第4項所述之光學檢波器，其中更有一用 以防止入射至物鏡之光的傳送之第一光控制機構設置於該 物鏡與輔助鏡片之間。 8. 如申請專利範圍第5項所述之光學檢波器，其中更有一用 以防止入射至物鏡之光的傳送之第一光控制機構設置於該 物鏡與輔助鏡片之間。 9. 如申請專利範圍第丨項或第2項或第3項所述之光學檢波 器，其中更有一第二光控制機構設置於該物鏡之中心軸外 圍，用以控制介於入射光之近轴與遠轴二區域間之中間區 域之光。 10·如申請專利範圍第4項所述之光學檢波器，其中更有一第 二光控制機構設置於該物鏡之中心轴外圍，用以控制介 於入射光之近軸與遠轴二區域間之中間區域之光。 11. 如申請專利範圍第5項所述之光學檢波器，其中更有一第 二光控制機構設置於該物鏡之中心軸外圍，用以控制介 於入射光之近轴與遠軸二區域間之中間區域之光。 12. 如申請專利範圍第6項所述之光學檢波器，其中更有一第 二光控制機構更設置於該物鏡之中心軸外圍，用以控制 介於入射光之近轴與遠轴二區域間之中間區域之光。 13. 如申請專利範圍第7項所述之光學檢波器，其中更有一第 二光控制機構更設置於該物鏡之中心軸外圍，用以控制 介於入射光之近轴與遠轴二區域間之中間區域之光β 15 本紙張尺度逋用中两國家揉準（CNS ) Α4規格（2ί0Χ 297公釐) (請先《讀背面之注f項存埃寫本策) 451190 A8 B8 C8 D8 六、申請專利範圍 14.如申請專利範圍第8項所述之光學檢波器，其中更有一第 二光控制機構更設置於該物鏡之中心軸外圍，用以控制 介於入射光之近轴與遠軸二區域間之中間區域之光。\ (請先Μ讀背面之注f項再填寫本頁) 經濟部中央揉準局負工消费合作社印装 本紙張尺度逍用中困國家揉準（CNS ) A4規格（210 X 297公釐）4 5119ο AS B8 C8 D8 Amends the scope of patent application for printing. Printed by the Central Bureau of Commerce, Ministry of Economic Affairs, and the Wc Industrial and Consumer Cooperative. 1. An optical detector, which includes: — an objective lens that contains an objective lens facing the disc and has a preset Effective diameter 'and at least two auxiliary lenses are located outside the objective lens to guide + first-order diffracted light into a path different from the light passing through the objective lens; a light source can illuminate its light onto the disc through the objective lens; A beam splitter between the light source and the objective lens is used to guide the light reflected from the disc into a path different from that of the light source; an optical debt detector is used to detect the reflection from the disc and pass through the disc. The light from the beam splitter; and at least two diffractive light detectors to detect the diffracted light incident from the auxiliary lens "2. The optical detector according to item 1 of the scope of patent application, wherein said light source And the objective lens are located in a straight light path, and the light detector is located in a path diffracted by the beam splitter. 3. The optical detector according to item 1 of the patent application ^, wherein the objective lens and the light detector are located in a straight light path, and the light source is located in a path diffracted by the beam splitter. 4. According to the optical detector described in item 1 or item 2 or item 3 of the patent application scope, the auxiliary lens is a holographic lens based on the diffraction principle. 5. The optical detector according to item 1 or item 2 or item 3 of the scope of the patent application, wherein the objective lens and the auxiliary lens are integrally formed. 6. The optical detector according to item 1 or item 2 or item 3 of the scope of the patent application, wherein a first light control mechanism for preventing the transmission of light incident on the objective lens is provided on the objective lens and the auxiliary lens "The paper" scale applies to China's national standard (CNS) A4 specification (210X297 mm) (please read the note on the back of $ ¥ Pack-write this page), 嗲 " —line C 5 4 Central Ministry of Economic Affairs Printed by the sample rate bureau Shellfish Consumer Cooperative ^ gq ss C8 —______ D8: 'Application for patent scope 7 · The optical detector described in item 4 of the scope of patent application, among which there is a means for preventing the transmission of light incident on the objective lens The first light control mechanism is disposed between the objective lens and the auxiliary lens. 8. The optical detector according to item 5 of the scope of patent application, wherein a first light control mechanism for preventing transmission of light incident on the objective lens is provided between the objective lens and the auxiliary lens. 9. According to the optical detector described in the scope of patent application item 丨 or item 2 or item 3, a second light control mechanism is further provided on the periphery of the central axis of the objective lens to control the distance between incident light The light in the middle area between the two areas of the axis and the far axis. 10. The optical detector according to item 4 of the scope of the patent application, wherein a second light control mechanism is provided outside the central axis of the objective lens to control the distance between the near-axis and far-axis regions of the incident light. Light in the middle area. 11. The optical detector described in item 5 of the scope of the patent application, wherein a second light control mechanism is provided outside the central axis of the objective lens to control the distance between the two regions of the near axis and the far axis of the incident light. Light in the middle area. 12. The optical detector described in item 6 of the scope of the patent application, wherein a second light control mechanism is further provided outside the central axis of the objective lens to control the area between the near axis and the far axis of the incident light. The light of the middle area. 13. The optical detector described in item 7 of the scope of the patent application, wherein a second light control mechanism is further provided on the periphery of the central axis of the objective lens to control the region between the near axis and the far axis of the incident light. The light in the middle area β 15 This paper is in the standard of the two countries (CNS) Α4 size (2ί0χ 297 mm) (please read "Note f on the back side of the paper and write the policy on deposite") 451190 A8 B8 C8 D8 Patent application scope 14. The optical detector described in item 8 of the patent application scope, wherein a second light control mechanism is further disposed on the periphery of the central axis of the objective lens to control the near axis and the far axis of the incident light The light of the middle area between two areas. \ (Please read the note f on the back before filling in this page) Printed by the Central Consumers ’Bureau of the Ministry of Economic Affairs, printed by the Consumers’ Cooperatives of the Ministry of Economic Affairs, the paper size is standard for use in difficult countries (CNS) A4 (210 X 297 mm)