CO 經濟部中央標準局員工消費合作杜印製 13663 A7 B7•五、發明说明（I ) 本發明係一種儲存或謓取不同色散或厚度碟片規格 之光學頭裝置，尤指一種可供DVD碟片（Digital Ve「s it ile. Disk，簡稱 DVD)、CD 碟片（Compact Disk，簡稱 CD) 、CD-R 碟片（CD-Recordable >.簡稱 CD-R))、CD-E 碟片（CD -Erasable，簡稱CD-E 或CD-Rewitable)或 PD 碟片（Phase Change Disk，簡稱PD)等多種碟片規格能共用一個光學 頭之裝置。 按，由於實訊之需求快速成長，符合不同需求光碟片 之規格裙繼問世，造成百家爭鳴之現象，而如何使光學頭 具有共用性，即成為現今熟知該項領域者，相當重要之課 題； 由於碟片記錄密度提高之需求，西元1995年底 DVD光碟規格採用波長635/650 nm之雷射光源，及記錄 層在0.6 mB厚度之碟片；CD碟片規格採用波長7 80 η® 之雷射光源，及記錄層在1.2 ββ厚度之磲片*若使兩種不 同規格碟片共用一光學頭之情況下，則時有下列之問題點 1、 由於碟片記錄層之位置不同，若使光學頭僅用一 個物鏡，將因球差過大，致無法兼顧DVD碟片及CD碟片之 讀取或記錄；- 2、 因雷射光之波長不同，CD-E碟片、PD碟片之色 散及CD-R碟片染料層（Dye Layer)之穿透光譜，皆會因其 使用波長之不同（780 nm - 635/ 650 nm)，造成信號雜 音比b/N)變弱，使得謓取或記錄產生問題。 -2 - (請先閱讀背面之注意事項再填寫本頁) 裝· •訂 _0線 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 313663 A7 • B7 五、發明説明（>) 為了解決第1項問題點，有些發明於是採用全像光學 元件（Holographic Optical Element，簡稱 HOE)、雙物鏡 (Twin Lens)或液晶快門（LCD Shutter)方式來克服讀取因 不同厚度碟片所造成球差過大之問題，使得DVD碟片及CD 碟片有共用一光學頭之可能性，惟*因為CD-R碟片、PD碟 片、CD-E碟片等色散特性會依波長之不同而改變，故，此 三種格式之碟片無法用上述方法讀取或儲存。 為了解決第2項問題點*有些發明於是採用2個光學 頭或兩套光學糸統，來解決因雷射光波長之不同，以利讀 取或記錄CD-E碟片、PD碟片及CD-R碟片產生之問題；此種 方式雖使得光碟機能讀取DVD碟片、CD碟片、CD-E碟片、 PD碟片及CD-R碟片，但是，其耗費之成本較高，且糸統較 複雜。 有鑑於此，發明人乃針對此等缺失及依據多年來從事 製造產品之相關經驗，悉心觀察且研究之，而终開發設計 出一種儲存或謓取不同色散或厚度碟片規格之光學頭裝置 Ο 經濟部中央標準局員工消費合作社印製 (請先閱讀背面之注意事項再填寫本頁) 本發明之主要目的，係提供一種儲存或謓取不同色散 或厚度碟片規格之光學頭裝置，其主要係使不同波長λ 1、λ2之雷射二極體（Laser Diode)可配合兩分光鏡（Bea B Splitter)、準直透鏡（Collimator Lens)、聚焦鏡组 與光感測器（Photodetec tor)等組合構件，俾達到多種不 同格式（Format)之碟片能共用一光學頭（Pick-Up Head) 之目的。 i 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 經濟部中央標準局員工消费合作社印製 A7 B7〃五、發明説明（4 ) «* 為使能對本發明之目的、形狀、構造或装置特徵及其 功效，作更進一步之認識與瞭解，茲舉實施例配合圖式詳 细說明如下： 第一圖係本發明之一實施例圖。 第二圖係第一分光鏡之穿透頻譜圖。 第三圖係第二分光鏡之穿透頻譜圖。 第四圖係本發明®鏡光圈之结構圖。 第五圖係本發明Μ—全像分色分光鏡取代兩片分光鏡 之實‘例圖。 第六圖係本發明全像分色分光鏡之结構圖。 第七圖係兩片全像分色鏡结合於一基板之示意圖。 第八圖係全像分色分光鏡製造方法之示意圖。 第九圈係入射光束經由全像分色分光鏡作用之示意圖。 第十圖係本發明Κ兩波長分光鏡取代兩片分光鏡之賁 施例圖。 第十一圖係本發明兩波長分光鏡之结構圖。 第十二圈係本發明之雷射二極體置放不同空間排列形 態之示意圖。 第十三圖係本發明於分光鏡組與光感測器之間加一凹 透鏡之實施例圈。 第十四圔係本發明以繞射光學元件取代漶鏡光圈局部 之實施例圖。 第十五圖係繞射光學元件與一非球面物鏡结合，取代 漶鏡光圈之示意圖。 ^ — ---7 — ^~「--裝-- (請先閲讀背面之注意事項再填寫本頁) -訂 d .4—. 本紙張尺度適用中國國家標準（CNS ) A4规格（210X297公釐）CO Printed 13663 A7 B7 • Consumer Cooperation of Employees of the Central Standards Bureau of the Ministry of Economic Affairs. V. Description of Invention (I) The present invention is an optical head device that stores or retrieves disc specifications with different dispersions or thicknesses, especially a DVD disc. Disc (Digital Ve "s it ile. Disk", referred to as DVD), CD disc (Compact Disk, referred to as CD), CD-R disc (CD-Recordable >. referred to as CD-R)), CD-E disc (CD-Erasable, abbreviated as CD-E or CD-Rewitable) or PD disc (Phase Change Disk, abbreviated as PD) and other disc specifications can share one optical head device. Different specifications of optical disc skirts came out, resulting in the phenomenon of controversy, and how to make the optical head common, that is, it is a very important issue for those who are familiar with this field today. Due to the demand for increased recording density of discs, the end of 1995 DVD disc specifications use a laser source with a wavelength of 635/650 nm, and a disc with a recording layer thickness of 0.6 mB; CD disc specifications use a laser source with a wavelength of 7 80 η®, and a disc with a recording layer thickness of 1.2 ββ * If the two are not In the case of a disc with a common optical head, the following problems may occur: 1. The position of the recording layer of the disc is different. If the optical head uses only one objective lens, the spherical aberration will be too large to take into account the DVD disc. And CD disc reading or recording;-2. Due to the different wavelengths of laser light, the dispersion of CD-E disc, PD disc and the transmission spectrum of CD-R disc dye layer (Dye Layer) will be Due to the different wavelengths used (780 nm-635/650 nm), the signal noise ratio b / N is weakened, which causes problems with picking or recording. -2-(Please read the precautions on the back before filling this page ) Packing • • _0 line paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm) 313663 A7 • B7 5. Description of invention (>) In order to solve the problem of item 1, some inventions adopt full To overcome the problem of excessive spherical aberration caused by reading discs of different thicknesses, such as Holographic Optical Element (HOE), Twin Lens or LCD Shutter, making DVD discs and CD discs The film may share an optical head, but The dispersion characteristics of CD-R discs, PD discs, CD-E discs, etc. will change according to the wavelength, so these three formats cannot be read or stored by the above method. In order to solve the second problem Point * Some inventions use 2 optical heads or 2 sets of optical systems to solve the problem caused by the difference in laser wavelength to read or record CD-E discs, PD discs and CD-R discs. Although this method allows the optical disc drive to read DVD discs, CD discs, CD-E discs, PD discs, and CD-R discs, it is more expensive and complicated. In view of this, the inventors have carefully observed and studied these deficiencies and based on the relevant experience in manufacturing products for many years, and finally developed and designed an optical head device that stores or retrieves disc specifications of different dispersion or thickness. Printed by the Employee Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs (please read the precautions on the back before filling in this page) The main purpose of the present invention is to provide an optical head device that stores or retrieves disc specifications with different dispersions or thicknesses. The laser diodes with different wavelengths λ1 and λ2 can be used with Bea B Splitter, collimator lens, focusing lens group and photodetec tor, etc. Combined components, so as to achieve the purpose of a variety of different formats (Format) disc can share an optical head (Pick-Up Head). i This paper scale is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm) A7 B7 〃 printed by the Staff Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs 5. Description of the invention (4) «* In order to enable the purpose, shape, For further understanding and understanding of the structure or device features and their functions, the following examples and drawings are described in detail as follows: The first figure is a diagram of an embodiment of the present invention. The second diagram is the transmission spectrum diagram of the first beam splitter. The third diagram is the transmission spectrum diagram of the second beam splitter. The fourth figure is a structural diagram of the present invention ® mirror aperture. The fifth figure is a real example of the M-holographic dichroic beam splitter of the present invention replacing two beam splitters. The sixth figure is a structural diagram of the holographic dichroic beam splitter of the present invention. The seventh figure is a schematic diagram of two holographic dichroic mirrors combined on a substrate. The eighth figure is a schematic diagram of the manufacturing method of the holographic dichroic beam splitter. The ninth circle is a schematic diagram of the incident beam passing through the holographic dichroic beam splitter. The tenth figure is a diagram of an embodiment of the invention in which a K two-wavelength beam splitter replaces two beam splitters. Figure 11 is a structural diagram of a two-wavelength beam splitter of the present invention. The twelfth circle is a schematic diagram of the laser diodes of the present invention placed in different spatial arrangements. Figure 13 is an embodiment of the present invention in which a concave lens is added between the beam splitter group and the light sensor. The fourteenth image is an embodiment of the present invention in which a diffractive optical element is used to replace a part of the diaphragm aperture. Figure 15 is a schematic diagram of the diffractive optical element combined with an aspherical objective lens to replace the diaphragm aperture. ^ — --- 7 — ^ ~ "--install-- (please read the precautions on the back before filling in this page) -Subscribe d.4—. This paper size is applicable to China National Standard (CNS) A4 specification (210X297 Centigrade)
31S66S A7 B7 經濟部中央標準局負工消費合作杜印製 五、發明説明（a ) 第十六圖係本發明於一分光鏡组及一雷射二極體之 間加一光柵之實施例圖。 第十七圖係本發明以偏極性分光鏡及一 1/4波長延遲 片取代分光鏡組之實施例圖。 圖號名稱與說明： 1、 1<兩不同波長λ 1、λ 2之雷射二極體 2、 2 — 兩分光鏡 3 準直透鏡 4 聚焦鏡组 41 滤鏡光圈 42 物鏡 43 制動器 ♦ 46 繞射光學元件 5 碟片 6 光感測器 7 全像分色分光鏡 8、 δ - 二波長分光鏡 9、 9' 兩偏極性分光鏡 10 凹透鏡 20 光柵 30 1/4波長延遲片 請參閱第一圈所示，本發明係一種「儲存或謓取不同 色敗或厚度碟片規格之光學頭裝置j *主要包括有一組雷 ί 射二極埋（Laser Diode)l、1'、兩片分光鏡（Beam Split (請先閲讀背面之注意事項再填寫本頁) -裝. • H-- ^ ，-'° 本紙張尺度適用中國國家標準（CNS ) A4规格（210X297公釐） 經濟部中央標準局貝工消費合作社印製 A7 __B7，五、發明説明（5 ) te「）2、2'、一準直透鏡（Collimator Lens)3 及一聚焦鏡 組4、磲片（DVD碟片及CD碟片）5及一光感測器（Photodetec to「）6等構件；其中： 分光鏡2、於空間形態之位置係分別與雷射二極 體1、厂形成一適當之角度，Μ令經由不同波長λ1(λ2 )雷射二極體1、（1>)產生之光束入射至分光鏡2(2 /)後 *反射光束會與準直透鏡3之光軸重合，並使該分光鏡2( 2<)可分別針對不同波長λΐ、（λ2)之雷射二極體1、（ 1 ' Γ產生之光束作部份反射（在本創作之實施例係作5 0 %之反射，50%穿透，其餘波長則全部穿透而不反射） ，其光束穿透分光鏡2、2/之穿透頻譜圖，如第二及第三 圖所示，而在實際之應用中，分光鏡2(2')只需使波長λ 1(λ2)波長部份穿透、部份反射，波長λ2(λ1)波長全部 穿透即可，不必考盧使全部波長穿透。 此外，在分光鏡2(2 <)於軸向一側之相對位置上，依 序設有一準直透鏡3、一聚焦鏡組4及碟片5，以使經由其 中一分光鏡2(2 / )之光束變成平行光束後，得以經由聚焦 鏡組4聚焦於碟片5上，而在該分光鏡2(2 ―)於軸向另側之 相對位置上，則設有一光感測器6，以使依原路返回之光 束得Κ入射至光感測器6上，Μ作為數位（〇、1)信號及聚 焦尋軌之依據。 聚焦鏡组4係由一¾鏡光圈41、物鏡42及制動器（Act uater)43结合而成，其中該物鏡42之前方置設有一漶鏡光 ' 圈41，該瀘鏡光圈41上有染料或鍍膜，使波長λ 1之光束 -6 - ;紙張尺度適用中關家鮮（CNS )八4祕（210X297公釐） (請先閱讀背面之注意事項再填寫本頁) 經濟部中央標準局員工消費合作社印製 A7 B7五、發明説明（']) 能不受阻礙地通過·而波長λ 2之光束則會被吸收不能通 過，俾使聚焦鏡組4能有不同的數值孔徑及景深，以達到 讀取不同厚度及色散材質碟片之目的，且該物鏡42接設有 一制動器43，藉該制動器43用Μ調整該物鏡42與碟片5之 距雔，Μ達到最佳聚焦成像之目的，因有裢鏡光圈41的存 在，使得波長λ2之光束數值孔徑較波長λΐ為小，故能獲 得較大之景深，再配合制動器43的調整，即可改變該物鏡 42至碟片5之距離，是Μ，因球差及色散產生之問題可大 幅降低，達到讀取不同規格碟片之目的。 請參閱第四圖所示，係漶鏡光圈之结構圖，其在斜線 區域A，波長λ2之光束會被吸收，波長λΐ之光束會全部 通過；而在空白區域Β，波長λ 1、λ 2之光束則全部通 ♦ 過0 當光學頭要讓取或儲存不同規格碟片5之資料，並採 用λ 1波長之雷射二極體1時，提供該雷射二極體1之電源 將被接通，並使該雷射二極體1產生光束，致該光束入射 至其中一分光鏡2上，如此，則有5 0%之光束被反射至 準直透鏡3,以使該光束轉變成平行光，同時，使該平行 光可經由聚焦鏡組4之滤鏡光圈41、物鏡42聚焦於碟片5上 ，而從碟片5上反射之光束則依原路返回*經聚焦鏡组4之 物鏡42、滹鏡光圈41及準直透鏡3反射至該分光鏡2上，此 時，則又有5 0%之光束將穿過分光鏡2,並全部穿透另 —分光鏡2'入射至光感測器6上，作為數位（0、1)信號及 聚焦尋軌之依據； (請先閱讀背面之注意事項再填寫本頁) Τ -裝. 訂 本紙張尺度適用中國國家標準（CNS ) Α4規格（210Χ297公釐） 313663 Α7 Β7 經濟部中央標準局員工消費合作社印製 五、發明説明（） 當光學頭要讀取或儲存不同規格碟片5之資料，並採 用λ 2波長之雷射二極體1"時，提供該雷射二極體之 電源將被接通，並使該雷射二極體產生光束，致該光 束全部穿過其中之一分光鏡2，且人射至另一分光鏡2 -上 *如此，則有5 0%之光束被反射至準直透鏡3，以使該 光束變成平行光，同時•使該平行光可經由聚焦鏡组4之 濾鏡光圈41將周圍區域Α内之波長λ 2吸收，所Κ數值孔徑 會縮小，使物鏡42能聚焦於碟片5上，而從碟片5上反射之 光束則依原路返回，經聚焦鏡组4之物鏡42、濾鏡光圈41 及準直透鏡3全部穿透分光鏡2，並有5 0%之光束將穿過 另一分光鏡入射至光感測器6上，作為數位（0、1)信號 及聚焦尋軌之依據。 請參閱第五圖所示，其係Μ全像分色分光鏡用Μ取代 上述底第一圖之兩片分光鏡之實施例圖，該全像分色分光 鏡7之内部條紋為折射率或相位分布之週期變化，如第六圖 所示，由於雷射二極體1、入射光之波長λΐ及λ2會滿 足布萊格（Bragg)反射定律2d sin0 = η λ的關係，故， 不同波長λΐ及λ 2會被反射不同的角度Θ1及62,同時 ，全像分色分光鏡7之特性可有部份反射及部份穿透之作 用，故，於設計上Μ 50%反射及50%穿透之效率最 佳0 若是全像分色分光鏡所用之材料的作用頻寬範圍較 窄，也可以採用兩片全像分色分光鏡组成，其中第一片 全像分光鏡會使波長λ 1半穿透、半反射*而波長λ 2則 - 8 卜 {請先Κ讀背面之注意事項再填寫本頁) 裝. 訂 d 本纸張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 經濟部中央標準局貝工消費合作社印製 A7 _ B7 五、發明説明（？） 不受作用的通過；第二片全像分光鏡會使波長λΐ通過* 而波長λ 2半穿透、半反射。 兩片全像分色分光鏡可黏合於一基板上，使波長λΐ 、λ 2光束反射後之光軸重合，如第七圖所示。 請參閲第八圖所示，其係全像分色分光鏡製造方法之 示意圖，當兩不同之雷射光束Cl、C2入射至感光材料（記 錄介質）上，會形成干涉條紋，此時，若使感光材料經過 顯影、定影及漂白等程序處理後，感光材料之穿透率、相 位或折射率等則會依干涉條紋之改變，做遇期性變化，由 於波長λ 1及λ 2之光束從不同角度入射，故，可使該兩光 束在反射後之光袖重合，如第九圖所示。 請參閲第十圖所示*其係將兩片分光稜鏡黏合為一二 參 波長分光鏡之實施例圖*該等分光稜鏡8、係採用鍍膜 之方式來造成對特定波長半穿透及半反射之現象，如第十 一圖所示•其中薄膜層S1係對波長λΐ半穿透半反射，對 波長λ 2全部穿透之薄膜；而薄膜層S2係對波長λ 2半穿 透半反射*對波長λ 1全部穿透之薄膜。 由於雷射二極體1、有一角度差，為使反射後之 光軸重叠之致，故，薄膜層S1及S2必需夾一角度，即薄膜 層S1使波長λΐ 50%穿透；50 %反射，使波長λ 2全 部穿透，而薄膜曆S2則使波長λ 2部份穿過，部份反射， 使波長λ 1全部穿透，且使波長λΐ、λ 2反射後之光軸重 合，倘若該等分光稜鏡8之材質色散（Dispersion)不大， 其中一分光稜鏡8#可省略不用，只用分光稜鏡δ即可。 -9 - 本紙張尺度適用中國國家標準（CNS ) Α4規格（210X297公釐） (請先閲讀背面之注意事項再填寫本頁)31S66S A7 B7 Du Printed by the Ministry of Economic Affairs, Central Bureau of Standards, Duty Consumption Cooperation V. Description of the invention (a) The sixteenth figure is an embodiment of the invention in which a grating is added between a beam splitter group and a laser diode . Figure 17 is a diagram of an embodiment of the present invention in which a polarizing beam splitter and a 1/4 wavelength retarder are used to replace the beam splitter set. Drawing name and description: 1, 1 < two different wavelengths λ 1, λ 2 laser diode 2, 2 — two beam splitters 3 collimating lens 4 focusing lens group 41 filter aperture 42 objective lens 43 stopper 46 Optics 5 Disc 6 Light sensor 7 Holographic dichroic beam splitter 8, δ-two-wavelength beam splitter 9, 9 'bipolar polarized beam splitter 10 concave lens 20 grating 30 1/4 wavelength retarder Please refer to the first As shown in the circle, the present invention is an "optical head device for storing or retrieving disc specifications of different color failures or thicknesses. J * Mainly includes a set of laser diodes, 1 ', two beam splitters (Beam Split (please read the precautions on the back before filling in this page)-Pack. • H-- ^,-'° This paper scale is applicable to China National Standard (CNS) A4 specification (210X297 mm) Central Bureau of Standards, Ministry of Economic Affairs Printed by Beigong Consumer Cooperatives, A7 __B7, V. Description of the invention (5) te ") 2, 2 ', a collimator lens 3 and a focusing lens group 4, and discs (DVD discs and CD discs) ) 5 and a photo sensor (Photodetec to ") 6 and other components; among them: beam splitter 2, in space form The positions are respectively at an appropriate angle to the laser diode 1 and the factory. M makes the beams generated by the laser diodes 1 (1>) at different wavelengths λ1 (λ2) enter the beam splitter 2 (2 / ) The back * reflected beam will coincide with the optical axis of the collimator lens 3, and the beam splitter 2 (2 <) can be produced for laser diodes 1, (1 ′ Γ) of different wavelengths λ1, (λ2) respectively The light beam is partially reflected (in the embodiment of the present invention, it is 50% reflection, 50% penetration, and the rest of the wavelengths are all transmitted without reflection), and the light beam penetrates the splitting spectrum of the beam splitter 2, 2 / As shown in the second and third figures, in practical applications, the beam splitter 2 (2 ') only needs to partially penetrate and partially reflect the wavelength λ1 (λ2), and the wavelength λ2 (λ1) All the wavelengths can be penetrated, and it is not necessary to pass through all the wavelengths. In addition, at the relative position of the beam splitter 2 (2 <) on the axial side, a collimating lens 3 and a focusing lens group are sequentially provided 4 and disc 5, so that the light beam passing through one of the beam splitters 2 (2 /) becomes a parallel beam, and can be focused on the disc 5 through the focusing lens group 4, and the beam splitter 2 (2-) is To the relative position on the other side, a light sensor 6 is provided, so that the light beam returning along the original path is incident on the light sensor 6 by K, and M is used as a digital (〇, 1) signal and focus tracking Basis. The focusing lens group 4 is composed of a lens aperture 41, an objective lens 42 and an actuator (Act uater) 43, wherein the objective lens 42 is provided with a lens light aperture 41 in front of the lens aperture 41. Dye or coating to make the light beam with wavelength λ 1 -6-; paper size is suitable for Zhongguan Jiaxian (CNS) 8.4 secrets (210X297mm) (Please read the notes on the back before filling this page) Central Bureau of Standards, Ministry of Economic Affairs Printed by staff consumer cooperatives A7 B7 V. Description of the invention (']) Can pass unimpeded · The light beam with wavelength λ 2 will be absorbed and unable to pass, so that the focusing lens group 4 can have different numerical aperture and depth of field, In order to achieve the purpose of reading discs with different thicknesses and dispersive materials, the objective lens 42 is provided with a stopper 43, and the stopper 43 is used to adjust the distance between the objective lens 42 and the disc 5 by Μ, to achieve the purpose of optimal focus imaging , Due to the presence of the iris diaphragm 41, the number of beams with wavelength λ2 The aperture is smaller than the wavelength λ1, so a larger depth of field can be obtained, and the adjustment of the brake 43 can change the distance between the objective lens 42 and the disc 5, which is Μ. The problems due to spherical aberration and dispersion can be greatly reduced. To achieve the purpose of reading discs of different specifications. Please refer to the fourth figure, the structural diagram of the diaphragm aperture. In the oblique line area A, the light beam with the wavelength λ2 will be absorbed, and the light beam with the wavelength λ1 will all pass; while in the blank area B, the wavelength λ1, λ2 The light beams all pass through 0. When the optical head wants to take or store the data of disc 5 of different specifications and uses the laser diode 1 of λ 1 wavelength, the power supply of the laser diode 1 will be Turn on, and make the laser diode 1 generate a beam, so that the beam is incident on one of the beam splitters 2, so that 50% of the beam is reflected to the collimator lens 3, so that the beam is converted into Parallel light, at the same time, the parallel light can be focused on the disc 5 through the filter aperture 41 and the objective lens 42 of the focusing lens group 4, and the light beam reflected from the disc 5 returns to the original path * through the focusing lens group 4 The objective lens 42, the mirror aperture 41 and the collimator lens 3 are reflected onto the beam splitter 2. At this time, another 50% of the light beam will pass through the beam splitter 2, and all of the beam splitter 2 'is incident To the light sensor 6, as the basis of digital (0, 1) signal and focus tracking; (please read the precautions on the back first Write this page) Τ- 装. The size of the bound paper is in accordance with the Chinese National Standard (CNS) Α4 specification (210Χ297 mm) 313663 Α7 Β7 Printed by the Employee Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economy V. Invention description () When the optical head is to be read When fetching or storing data from disc 5 of different specifications and using laser diode 1 " of λ 2 wavelength, the power supply for the laser diode will be turned on and the laser diode will generate a beam , So that the light beam passes through one of the beam splitters 2 and the person shoots on the other beam splitter 2-this way, 50% of the light beam is reflected to the collimating lens 3, so that the beam becomes parallel light At the same time, the parallel light can absorb the wavelength λ 2 in the surrounding area A through the filter aperture 41 of the focusing lens group 4, the numerical aperture of the K will be reduced, so that the objective lens 42 can focus on the disc 5, and from the disc The light beam reflected on the sheet 5 returns to the original path, passes through the objective lens 42, the filter aperture 41, and the collimator lens 3 of the focusing lens group 4 all penetrates the beam splitter 2, and 50% of the light beam will pass through another beam splitter The mirror is incident on the light sensor 6 as a digital (0, 1) signal and focus tracking in accordance with. Please refer to the fifth figure, which is an embodiment diagram in which the holographic dichroic beam splitter uses M to replace the two beam splitters in the first picture above. The internal stripes of the holographic dichroic beam splitter 7 are refractive index or The periodic change of the phase distribution, as shown in the sixth figure, because the laser diode 1, the wavelengths of the incident light λ 1 and λ 2 will meet the Bragg (Bragg) reflection law 2d sin0 = η λ relationship, so different wavelengths λΐ and λ2 will be reflected at different angles Θ1 and 62. At the same time, the characteristics of the holographic dichroic beam splitter 7 may have partial reflection and partial penetration. Therefore, in the design, M 50% reflection and 50% The efficiency of penetration is the best 0. If the material used in the holographic dichroic beam splitter has a narrow bandwidth, it can also be composed of two holographic dichroic beam splitters. The first holographic dichroic beam splitter will make the wavelength λ 1 Semi-transmissive, semi-reflective * and wavelength λ 2-8 Bu (please read the precautions on the back and then fill out this page). Packed d The size of this paper is applicable to the Chinese National Standard (CNS) A4 specification (210X297 %) The A7 _ B7 printed by the Beigong Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs ) By the action of free; second dichroic hologram sheet would λΐ wavelength by the wavelength λ 2 * transflective, semi-reflective. The two holographic dichroic beamsplitters can be glued to a substrate, so that the optical axes of the wavelength λ 1 and λ 2 beams coincide after being reflected, as shown in the seventh figure. Please refer to the eighth figure, which is a schematic diagram of the manufacturing method of the holographic dichroic beam splitter. When two different laser beams Cl and C2 are incident on the photosensitive material (recording medium), interference fringes will be formed. If the photosensitive material is processed through development, fixing and bleaching procedures, the transmittance, phase or refractive index of the photosensitive material will change periodically according to the change of interference fringes, due to the light beams with wavelengths λ 1 and λ 2 Since they are incident from different angles, the reflected light sleeves of the two beams can be overlapped, as shown in the ninth figure. Please refer to the tenth figure. * It is an embodiment diagram of bonding two beam splitters into a two-parameter wavelength beam splitter. * The beam splitters 8, which use coating to cause semi-transmission to a specific wavelength And the phenomenon of semi-reflection, as shown in the eleventh figure. • The thin film layer S1 is a semi-transmissive half-reflective film for the wavelength λ1, and all penetrates the wavelength λ2; Semi-reflective film that penetrates all the wavelength λ1. Since the laser diode 1 has an angle difference, in order to overlap the reflected optical axes, the film layers S1 and S2 must be at an angle, that is, the film layer S1 allows the wavelength λΐ to penetrate 50%; 50% reflection , So that the wavelength λ 2 completely penetrates, and the film S2 causes the wavelength λ 2 to partially pass through, and partially reflects, so that the wavelength λ 1 fully penetrates, and the optical axes after the reflection of the wavelengths λ 1 and λ 2 coincide, if The material dispersion (Dispersion) of these spectroscopic filters 8 is not large, and one of the spectroscopic filters 8 # can be omitted and only the spectroscopic filter δ can be used. -9-This paper scale is applicable to China National Standard (CNS) Α4 specification (210X297mm) (Please read the precautions on the back before filling this page)
經濟部中央標準局員工消费合作社印製 313663 A7 B7 ，五、發明説明（q ) 另，本發明之雷射二極體1、不一定要放同一側 之位置（如第一圖將其放於X袖方向之XZ平面），亦可 K另一類型之形態，如第十二圖所示，其係將一雷射二 極體1放於Y軸之方向·•另一雷射二極體放於X軸之 方向，而準直透鏡3、聚焦鏡組4則放於Z軸之方向，即 在反射後之光軸重合之基礎上，雷射二極體1、1>、分 光鏡2、2 /之相對位置，可根據像差及空間大小要求而 予以改變。 外，在上述之第十二圖之類型中，逋鏡光圈41 亦可由偏極板（Polarizer)取代，而雷射二極體1、1'之 光束偏極之方式則需適當安排*使得波長λΐ、λ 2光束 經由分色分光鏡8、反射後之線偏極光方向正好垂直 ，倘若偏極板（Polarizer)之偏極方向與波長λ 1之光束 相同，則可使波長λΐ之光束不被吸收的通過；而波長 入2之光束則會被吸收*故，可達到與滹鏡光圈41相同之 光圈效果。 請參閲第十三圓所示，本發明亦可在兩分光鏡2、 2'及光感測器6之間，置放一凹透鏡（Concave Lens) 10 ，俾減少因兩分光鏡2、之傾斜角度及厚度所造成之 祭差（Coma)及像散（Astigmatism)，來達成聚焦尋軌所需 要之光波形，若是為了提供聚焦尋軌之需要，該凹透铸 10也可Μ改用圓柱透鏡或全像光學元件所取代。 請參閲第十四圖所示，本發明之濾鏡光圈41亦可用一 鏡射光學元件（Diffraction Optical Element)46取代 * -10 - 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） (請先閲讀背面之注意事哥再填寫本頁) 裝· 訂 A7 B7 經濟部中央標準局員工消費合作社印製 五、發明説明（⑺） 由於該繞射光學元件46之焦距會随波長之不同而改變，所 Μ該繞射光學元件46與物鏡42结合後，其焦距會随波長之 不同而改變，俾使經由準直透鏡3之平行光入射至聚焦鏡 組4後，即可因聚焦於碟片5上不同之位置，達到謓取不 同厚度碟片5之目的。 請參閲第十五圔所示，本發明之鐃射光學元件46亦 可與非球面物鏡结合成一單鏡片，Μ大幅降低成本及组 裝調整之工時。 當不同形式之碟片5記錄層、厚度差異不大，而物鏡 42本身材質色散(disper si on)較大時，則不同波長λ 1、 λ 2之焦距，自有所不同，可Μ不必該滤鏡光圈41或繞射 光學元件46，即可謓取不同厚度之碟片，達到降低成本 之目的；而當糸統伺服能力夠好時，上述實施例中之準 直透鏡可以省略。 本發明之聚焦尋軌方式可沿用習用光學頭中之像散 法（Astigmatism)、三束光法（3-Beam M.ethod)、相位差 分法(D i f f erent i ona 1 Phase Detection 或 Heterodyne) 或推挽法（Push-Pul 1 Method)等，若是使用三束光法則 雷射二極«1(1')前需加一光柵（GraUng)20,如第十六 圖所示。 由於兩分光鏡2、具有半穿透、半反射之特性， 造成有75%的雷射光未被使用*致雷射二極體1、1<之 輸出功率（Power)必需增加，且反饋之雜訊會導致雷射共 振腔不穩定，為克服此種現象，故，可採^以兩片偏極 -11 - 本紙張尺度適用中·國國家標準（CNS ) A4規格（210X297公釐） ---丨.1 (. .'Ί 裝--. (請先閱讀背面之注意事項再填寫本頁)313663 A7 B7 printed by the Staff Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs. V. Description of the invention (q) In addition, the laser diode 1 of the present invention does not necessarily need to be placed on the same side (as shown in the first picture) XZ plane in the direction of the X sleeve), or another type of shape, as shown in the twelfth figure, it is a laser diode 1 placed in the direction of the Y-axis · another laser diode Placed in the direction of the X axis, while the collimator lens 3 and focusing lens group 4 are placed in the direction of the Z axis, that is, based on the coincidence of the reflected optical axes, the laser diode 1, 1>, beam splitter 2 2. The relative position of 2 / can be changed according to the requirements of aberration and space size. In addition, in the type of the twelfth picture above, the mirror aperture 41 can also be replaced by a polarizer (Polarizer), and the way of polarizing the beam of the laser diodes 1, 1 'needs to be properly arranged * so that the wavelength The λ1 and λ2 beams pass through the dichroic beam splitter 8, and the direction of the linearly polarized light after reflection is just perpendicular. If the polarization direction of the polarizer (Polarizer) is the same as the beam of the wavelength λ1, the beam of the wavelength λ1 will not be affected The passage of absorption; and the light beam with a wavelength of 2 will be absorbed *, so the same aperture effect as the mirror aperture 41 can be achieved. Please refer to the thirteenth circle, the present invention can also place a concave lens (Concave Lens) 10 between the two dichroic mirrors 2, 2 'and the light sensor 6, in order to reduce the two dichroic mirrors 2, Coma and Astigmatism caused by the inclination angle and thickness to achieve the light waveform required for focusing and tracking. If it is necessary to provide focusing and tracking, the concave casting 10 can also be changed to a cylindrical shape. Replaced by lenses or holographic optical elements. Please refer to the fourteenth figure, the filter aperture 41 of the present invention can also be replaced with a mirror optical element (Diffraction Optical Element) 46 * -10-This paper scale is applicable to the Chinese National Standard (CNS) A4 specification (210X297 Cli) (please read the notes on the back first and then fill out this page) Binding · Order A7 B7 Printed by the Employee Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs 5. Description of Invention (⑺) Because the focal length of the diffractive optical element 46 varies with the wavelength The diffractive optical element 46 is combined with the objective lens 42 and the focal length of the diffractive optical element 46 changes with the wavelength. If the parallel light passing through the collimator lens 3 is incident on the focusing lens group 4, Focus on different positions on the disc 5 to achieve the purpose of picking discs 5 of different thickness. Please refer to the fifteenth figure, the ergonomic optical element 46 of the present invention can also be combined with an aspherical objective lens to form a single lens, which greatly reduces the cost and assembly adjustment man-hours. When the recording layer and thickness of the disc 5 of different forms have little difference, and the material dispersion of the objective lens 42 is relatively large, the focal lengths of different wavelengths λ 1, λ 2 are different, but they do not need to be The filter aperture 41 or the diffractive optical element 46 can obtain discs with different thicknesses to achieve the purpose of reducing costs; and when the servo capability of the system is good enough, the collimating lens in the above embodiment can be omitted. The focus tracking method of the present invention can follow the astigmatism method (Astigmatism), three beam method (3-Beam M.ethod), phase difference method (Diff erent i ona 1 Phase Detection or Heterodyne) in the conventional optical head or For Push-Pul 1 Method, if a three-beam method is used, a grating (GraUng) 20 needs to be added before the laser diode «1 (1 '), as shown in Figure 16. Due to the characteristics of the two dichroic mirrors 2, which have the characteristics of semi-transmission and semi-reflection, 75% of the laser light is not used. * The output power (Power) of the laser diode 1, 1 < must be increased, and the feedback is complicated The information will cause the laser cavity to be unstable. In order to overcome this phenomenon, you can use two pieces of polarizing -11-This paper scale is applicable to China National Standard (CNS) A4 specification (210X297mm)- -丨 .1 (. .'Ί 装-. (Please read the precautions on the back before filling this page)
*UT d ir. 313663 'A7 B7 玉、發明説明（N ) Μ 性分光鏡（Polarized Beam Splitter· )9、9'及一1/4 波 長延遲.片（Quarter Wave Retarder)30之組合取代兩分光 鏡2、，如第十七圖所示，此時，從雷射二掻體1、（ )入射至偏極性分光鏡9、W )之光束，會完全被偏 極性分光鏡9、（9/)反射，反射之光束經由準直透鏡3、 入射至1/4波長延遲片30之作用後，會變成圓偏極光，之 後，再經由聚焦鏡組4之逋鏡光圈41、物鏡42聚焦於碟片 5上； '而經碟片5反射後之光束，則再經由聚焦鏡組4之物鏡 42、漶鏡光圈41及1/4波長延遲片30，使該光束轉變成線 偏極光，此時，線偏極光之方向與入射時之光束相比較 *已被旋轉90度，故，線偏極光會全部穿透偏極性分 光鏡9(9 ~ )入射至光感測器6,是K，可使雷射光束之能 量有效地被運用•並可減少雜訊之干擾。 按，K上所述，僅為本發明最佳之一具體實施例， 惟本發明之構造特徴並不侷限於此，任何運用本發明說 明書及圖示内容所為之等效變化或修飾（如該碟片亦可為 CD-R磲片、CD-E碟片、PD碟片或其它具有相同功效之碟片 (#先閱讀背面之注意事項再填寫本頁) •裝* UT d ir. 313663 'A7 B7 jade, description of invention (N) M beam splitter (Polarized Beam Splitter) 9, 9' and a 1/4 wavelength delay. The combination of 30 (Quarter Wave Retarder) 30 replaces the two split beams Mirror 2. As shown in the seventeenth figure, at this time, the light beam incident from the laser dichroic body 1, () to the polarized beam splitter 9, W), will be completely by the polarized beam splitter 9, (9 / ) Reflected, the reflected beam passes through collimator lens 3 and enters the quarter-wave retarder 30, it will become circular polarized light, and then it is focused on the disc by the lens aperture 41 and the objective lens 42 of the focusing lens group 4 On the disc 5; 'The beam reflected by the disc 5 is then converted into linearly polarized light by the objective lens 42, focusing lens aperture 41 and 1/4 wavelength retarder 30 of the focusing lens group 4 , The direction of the linearly polarized light is 90 ° rotated compared to the incident beam. Therefore, the linearly polarized light will penetrate the polarized beam splitter 9 (9 ~) and enter the light sensor 6, which is K. The energy of the laser beam can be effectively used and can reduce the interference of noise. According to the description of K, it is only one of the best embodiments of the present invention, but the structural features of the present invention are not limited to this, any equivalent changes or modifications using the description and illustrated content of the present invention (such as the The discs can also be CD-R discs, CD-E discs, PD discs or other discs with the same effect (#Read the precautions on the back before filling this page) • Install
• ......- -1 J 訂 經濟部中央標準局員工消費合作社印製 明 陳 於 合 内 圍 範 利 專 之 案 本 下 % 在 蓋 涵 可 皆 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐）• ......- -1 J The case of printing a copy of Chen Yuhe's Fan Lizhuan printed by the Employee Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs. ) A4 specification (210X297mm)