200418006 玖、發明說明： 【發明所屬之技術領域】 本無明係關於包括一支座之一光學單元，該支座支撐用 於發射一光束之發光設備，並且提供一用於引導光束之光 學引導系統。 【先前技術】 US-A 5,600,619公開一光學頭，其包含具有一半導體雷射 之雷射光學系統，半導體雷射安裝在一致動器之一運動部 刀該運動部分由金屬材料組成，並且形成一熱發射體， Q此攸孩熱發射體到半導體雷射之熱傳導受到限制。在操 作中，藉由半導體雷射產生之熱量傳遞至熱輻射體，然後 T滅輻射體之表面輻射至光學頭之外部空間。在已知之光 卞〜中，雷射光學系統或其中至少一部分在使用時容易受 J /風度之矽響。頃發現這對於配備有如此一光學頭之掃描 裝=之掃描功能具有不利的影響，特別地，當應用高功率 、参導體雷射時。如此一雷射用於（例如）把資訊窝入磁 片中係必要的。 【發明内容】 、本鈇月之一目標係以高功率光源應用日寺，不影響光學引 ^系統或至少不嚴重影響光學引導系統之方式來改善前言 所逑之光學單元。 、根據本發明〈該目標係藉由光學單元所完成，其中單元 、争欲為涊發光兀件係以熱絕緣方式固定至支座上。藉由 該特徵就防止了或大致上阻礙了發光設備產生之熱量傳遞 87054 200418006 至支座。在其中一有利影響係光學引導系統保持低溫或至 少溫度夠低，以致於該光學引導系統之某些元件間之相互 位置和/或相互距離在發光元件使用過程中不受或幾乎不 受溫度的影響。換句話說，穿過支座與穿過光學引導系統 之溫度梯度小至零，以致於根據本發明該光學單元保證一 穩定光學路徑。這使得該光學單元特別適合應用於高功率 掃描裝置，例如需要之元件，像在DVD+R或DVD + RW光學 播放器，以及在小型裝置例如小形狀因數光學元件中者。 一般而言，該發光元件包括一半導體雷射。該光學引導系 統通常包括幾個光學元件，像一光束分離器，一視準儀鏡 頭，一鏡面，一伺服透鏡。 一般而言，支座進一步支撐一通常包括一多分流式光電 二極體之光學接收元件。當該光學單元用於一光學播放器 時，來自發光元件之光束係用來在一可寫的與/或可讀的光 碟之一資訊層上形成一掃描點。為了將光束聚焦於所要求 之點，故採用一物鏡。此物鏡可以為光學單元之一部分， 其中該光學單元被構建作為或係一聚焦致動器之一運動部 分之一零件，或者該物鏡可以作為一聚焦致動器之一運動 部分之一零件，在聚焦致動器中，該靜止部分藉由一框架 或藉由光學單元之支座支撐。如杲在該支座上提供聚焦致 動器，該光學單元安裝在一運動體上或者作為運動體之一 部分，例如一滑件或一旋臂，目的係為了沿著碟片表面移 動物鏡。應注意，術語’’光束’’不僅僅指可見光，而且也指 不可見光。 -6 - 87054 200418006 根據本發明之光學單元之一具體實施例，其特徵為發光 元件藉由熱絕緣元件連接到支座上。適合用於製造此絕緣 元件之一絕緣材料係一塑膠類材料，特別係一聚合體，例 如通常稱作樹脂玻璃之聚甲基丙烯酸甲酯（PMMA)或強化 環氧樹脂玻璃纖維。一般而言，該支座用金屬材料製成， 例如AlZn合金。聚合體之熱交換係數可能為100並且小於金 屬材料之熱交換係數很多倍，因此熱絕緣元件能充分阻止 從發光元件到該支座進而到光學引導系統之熱量傳遞。 較佳地，該熱絕緣元件係一平板或圓盤型，其中提供一 用於使由發光元件發出之光束通過之窗口。該窗口可以係 該絕緣元件之透明部分或平板或圓盤之一開口。在另一可 供選擇之實施例中，整個熱絕緣板型元件皆為透明的。 根據本發明，在該光學單元之進一步實施例中，該發光 元件（例如）藉由一壓入配合安裝在一金屬托架上或安裝在 一金屬托架中。在此情況下，該熱絕緣元件延伸至該金屬 托架與該支座之間。為了改善該光學單元周圍之外部空間 之熱傳遞，提供具有冷卻翼片之金屬托架係非常有利的。 本發明進一步係關於一光學播放器，該光學播放器具有 用於使光碟（特別對於CD-或DVD類型光碟）旋轉之一驅動 單元和具有包括一物鏡和一光學接收元件，用於掃描光碟 特別係光碟之資訊層或層。根據本發明，在光學播放器中 掃描單元包括該發明之光學單元。在此光學播放器中，可 以使用一高輸出發光元件，因為在運行過程中，從發光元 件至物鏡與光接收元件之溫度梯度夠小，以致於阻止了在 87054 200418006 %光元件中由於熱量的產生導致之該光學單元之光學元件 之相互位移所引起之信號衰減。本發明也係關於應用在根 據本發明的光學播放器中之掃描元件。 關於申請專利範圍，應注意到申請專利範圍所定義之各 種典型特徵可能以組合方式出現。 本發明之上述内容與其他方面從下文所述實施例可以看 出，並且將藉由下文所述實施例之非限定性實例來說明。 【實施方式】 根據本發明在圖1至圖4描述之該光學單元之實施例包括 一作為滑件la之一部分之支座1。在該例中滑件u與支座i 由AlZn合金製成，但是也可以由其他材料製成。滑件丨&具 有兩個軸承面3a與3b，用於同導引軸合作。該光學單元進 一步包括一發光裝置5與一光學引導系統，發光裝置5一般 也叫做輻射源，例如一半導體雷射，光學引導系統用於引 導由發光裝置5發射之光束或一般之幅射光束。該光學引導 系統包括下面所述之多種連接至支座丨上之光學元件。 在此所用光學引導系統包括一安裝在支座丨上之光束分 離器7。 Μ光學引導系統還包括一視準儀透鏡9和一鏡面Η，二者 都安裝在支座1上。鏡面"與光束成45度角放置。此外，該 光學引導系統包括一伺服透鏡13與一光束成形器Μ。 在圖1至圖4所示實施例具有一播 书卸描衣置，Μ掃描裝置έ 括一具有一物鏡15之透鏡系統與一且有_ 八’先學偵測器之4 學接收裝置17,特殊情況下包括一 ^ 尤私一極體系統。具有 87054 200418006 光軸15a之物鏡15係為在掃描表面形成一掃描點而設計。由 於此原因提供了 一聚焦致動器1 9，該聚焦致動器丨9有—安 裝在滑件1 a之靜止邵分，與一動態連接至該靜止部分之運 動邯分，並承載一物鏡1 5。應注意，該發光元件、光學引 導系統（各元件、光學引導系統本身、掃描裝置、光接收 裝置以及根據本發明應用在光學單元及裝置之致動器可以 為吾人所熟知之裝置、系統與元件，或者係吾人所熟知之 構件或結構。 圖1至圖4所示之裝置為在一有一資訊軌之資訊載體上讀 取現存資訊與將資訊寫入資訊載體而設計，該資訊載體特 指一光碟，例如一 DVD-RW。為從光碟中讀取資訊，發光 裝置5產生一連續光束，該光束通過光束成形器14、光束分 離器7、視準儀透鏡9與鏡面丨丨並且藉由物鏡〗5聚焦至光碟 上掃“點。该光束藉由光碟反射，如此在光碟之資訊軌 中反射光束包含對應一系列現存基本資訊特徵之資訊。該 反射光束經由物鏡15、鏡面11、视準儀透鏡9、光束分離器 7以及伺服透鏡13被引導至光學接收裝置17，以使光學接收 裝置17提供一對應於光碟上掃描資訊之偵測信號。為將資 訊寫入光碟，發光裝置5產生一光束，該光束與寫入之資訊 相對應並且經由光學引導系統引導至物鏡15，藉此在掃描 點中系列在光碟之貧訊執上之連續基本資訊特徵產生了。 根據本發明的光學^中，發光裝置係以熱絕緣方式安 裝在支座上。在圖丨至圖4所示光學單元中，發光裝置5安裝 在一由銅、鋁或其他適合之金屬材料製成之金屬板形托架 87054 200418006 2 1 < —開口 2 1 a中。在該托架2 1與支座1之間提供一熱絕緣 板型元件23。該絕緣板型元件23有一開口 23a ,該開口作為 一使由發光裝置5產生之光束通過之窗口。在此實施例中， 絕緣元件由聚曱基丙烯酸甲酯製成。若不藉由開口 23a，絕 緣兀件23亦可在發光裝置5之前面提供一透明部分。托架2ι 與絕緣元件23通過螺釘固定至支座1上。當然其他合適之固 定方式例如黏貼也可使用。 如果有必要，該金屬托架21可以配置冷卻翼片以改善對 環境之熱傳遞。 根據本發明，圖5所示之光學播放器之實施例有一可旋轉 地支撐一光碟103(在該實施例中為一 DVD + RW)之轉轴1〇2 之框架100，有兩個滑件裝置單元1〇6之磁性|厄1〇4，其中磁 性輛固定在框架100上。該裝置單元1〇6還包括與磁性軛^⑽ 合作之驅動線圈108。該驅動線圈1 〇8佈置在能夠沿著僅用 草圖表示之引導抽112以執行徑向平移運動。滑件11 〇可以 係如圖1至圖4所描述之滑件1 a，但是另一選擇係具有一致 動器與一光學單元之另一滑件。該光學播放器還有一在轉 軸102周圍以旋轉方向R使光碟1 〇3旋轉之一光碟驅動單元 114。 頃發現當提供一焉功率發光裝置時，如此一光學播放哭 滿足除了有關該光學透鏡系統、發光裝置與光接收裝置之 此等元件之位置之高精度要求之外，還滿足了關於該光學 引導系統之某些光學元件之相互位置與排列之高精度要求 。從測量中看來在那種情形下，在發光裝置之運行中支座 87054 -10 - 200418006 幾乎不變熱並且即使支座M，其加熱均勾並且在很小程 度上（發生變形與移位），即便有變形與移位，能夠被該光學 播放器之一般應用控制電子裝置和元件完全補償。由於此 種性質：根據本發明之光學單元與光學播放器特別適合於 寫入光學系統，並中禽 τ舄入過程不可旎因為校準整個設置而 停止。 值得注意的是本發明不限於這裏所示之實例。例如，結 :,上到《某些兀件或省略-元件也係可能的。而且術 m光于單元與光學播放器也可表示磁光學元件。 【圖式簡單說明】 表^示根據本發明，以透視圖與部分拆卸狀態圖解 表π点先學早兀之一實施例； 固2彳足不同角度描述圖1之實施例； 圖3係—沿圖！直線得之剖視圖； 圖4係—沿圖1直線IV-IVk得之剖視圖；及 圖5圖畴表示本發明之光學播放器之—實施例。 【圖式代表符號說明】 1 支座 la 滑件 3a 車由承面 3b 車由承面 5 發光裝置 7 光束分離器 9 視準儀透鏡 87054 200418006 11 鏡面 13 伺服透鏡 14 光束成形器 15 物鏡 15a 光學軸 17 光學接收裝置 19 聚焦致動器 21 板形托架 21a 開口 23 熱絕緣板型元件 23a 開口 100 框架 102 轉軸 103 光碟 104 磁性輛 106 滑件鏡頭單元 108 驅動線圈 110 滑件 112 引導軸 114 光碟驅動單元^ 87054 -12 -200418006 发明 Description of the invention: [Technical field to which the invention belongs] This ignorance relates to an optical unit including a stand, the stand supports a light emitting device for emitting a light beam, and provides an optical guidance system for guiding the light beam . [Prior Art] US-A 5,600,619 discloses an optical head including a laser optical system having a semiconductor laser, and the semiconductor laser is mounted on a moving part of an actuator. The moving part is composed of a metal material and forms a Thermal Emitter, Q The thermal conduction from a thermal emitter to a semiconductor laser is limited. In operation, the heat generated by the semiconductor laser is transferred to the thermal radiator, and then the surface of the radiator is radiated to the outer space of the optical head. Among the known lights 卞 ~, the laser optical system or at least a part of it is susceptible to J / degree of silicon when used. It was found that this had an adverse effect on the scanning function of the scanning device equipped with such an optical head, especially when high-power, reference conductor lasers were applied. Such a laser is necessary, for example, to embed information in a magnetic disk. [Summary of the Invention] One of the goals of this month is to improve the optical unit in the introduction by applying Risi with a high-power light source without affecting the optical guidance system or at least not seriously affecting the optical guidance system. According to the present invention, the objective is accomplished by an optical unit, in which the unit and the luminous element are fixed to the support in a thermally insulating manner. This feature prevents or substantially obstructs the heat transfer from the light emitting device 87054 200418006 to the support. One of the beneficial effects is that the optical guidance system is kept cold or at least low enough that the mutual position and / or mutual distance between certain elements of the optical guidance system is not affected or hardly affected by temperature during the use of the light emitting element. influences. In other words, the temperature gradient across the mount and through the optical guidance system is so small that the optical unit according to the invention guarantees a stable optical path. This makes the optical unit particularly suitable for use in high-power scanning devices, such as those required, such as in DVD + R or DVD + RW optical players, and in small devices such as small form factor optical components. Generally, the light-emitting element includes a semiconductor laser. The optical guidance system usually includes several optical elements, like a beam splitter, a collimator lens, a mirror surface, and a servo lens. Generally speaking, the support further supports an optical receiving element, which usually includes a multi-shunt photodiode. When the optical unit is used in an optical player, the light beam from the light emitting element is used to form a scanning spot on an information layer of a writable and / or readable disc. In order to focus the light beam at the desired point, an objective lens is used. The objective lens may be a part of an optical unit, wherein the optical unit is constructed as or a part of a moving part of a focusing actuator, or the objective lens may be a part of a moving part of a focusing actuator. In the focus actuator, the stationary portion is supported by a frame or by a support of the optical unit. For example, if a focusing actuator is provided on the support, the optical unit is mounted on or as a part of a moving body, such as a slider or a swing arm, for the purpose of moving the lens along the surface of the disc. It should be noted that the term '' beam '' refers not only to visible light, but also to invisible light. -6-87054 200418006 A specific embodiment of the optical unit according to the present invention is characterized in that the light emitting element is connected to the support via a thermal insulation element. One of the insulating materials suitable for the manufacture of this insulating element is a plastic material, in particular a polymer, such as polymethyl methacrylate (PMMA) or reinforced epoxy glass fiber, commonly known as Plexiglas. Generally, the support is made of a metal material, such as an AlZn alloy. The heat exchange coefficient of the polymer may be 100 and is many times smaller than the heat exchange coefficient of the metal material, so the thermal insulation element can sufficiently prevent the heat transfer from the light emitting element to the support and to the optical guidance system. Preferably, the thermal insulation element is of a flat plate or disc type, in which a window for passing a light beam emitted from the light emitting element is provided. The window can be a transparent portion of the insulating element or an opening in a flat plate or disc. In another alternative embodiment, the entire thermally insulated plate-type element is transparent. According to the present invention, in a further embodiment of the optical unit, the light-emitting element is, for example, mounted on a metal bracket by a press-fit or in a metal bracket. In this case, the thermal insulation element extends between the metal bracket and the support. In order to improve the heat transfer in the external space around the optical unit, it is very advantageous to provide a metal bracket system with cooling fins. The present invention further relates to an optical player having a drive unit for rotating an optical disc (especially for a CD- or DVD-type optical disc) and having an objective lens and an optical receiving element for scanning the optical disc. The information layer or layer of the disc. According to the invention, the scanning unit in the optical player includes the optical unit of the invention. In this optical player, a high-output light-emitting element can be used, because during operation, the temperature gradient from the light-emitting element to the objective lens and the light-receiving element is small enough to prevent the heat-induced Signal attenuation caused by mutual displacement of the optical elements of the optical unit is caused. The present invention also relates to a scanning element used in an optical player according to the present invention. Regarding the scope of patent application, it should be noted that various typical features defined by the scope of patent application may appear in combination. The above and other aspects of the present invention can be seen from the embodiments described below, and will be explained by non-limiting examples of the embodiments described below. [Embodiment] The embodiment of the optical unit described in FIGS. 1 to 4 according to the present invention includes a stand 1 as a part of the slider la. In this example, the slider u and the support i are made of an AlZn alloy, but they may be made of other materials. The slider has two bearing surfaces 3a and 3b for cooperation with the guide shaft. The optical unit further includes a light emitting device 5 and an optical guiding system. The light emitting device 5 is also generally called a radiation source, such as a semiconductor laser. The optical guiding system is used to guide a light beam or a general radiation beam emitted by the light emitting device 5. The optical guidance system includes a variety of optical elements connected to a support as described below. The optical guidance system used here includes a beam splitter 7 mounted on a stand 丨. The M optical guidance system further includes a collimator lens 9 and a mirror face 二者, both of which are mounted on the support 1. The mirror is placed at a 45-degree angle to the beam. In addition, the optical guidance system includes a servo lens 13 and a beam shaper M. The embodiment shown in Figs. 1 to 4 has a book-removing and tracing device, and the M-scanning device includes a lens system with an objective lens 15 and a four-receiving device 17 having eight detectors. In special cases, a special polar body system is included. The objective lens 15 having 87054 200418006 optical axis 15a is designed to form a scanning spot on the scanning surface. For this reason, a focusing actuator 19 is provided. The focusing actuator 9 has a stationary component mounted on the slider 1 a, and a movable component dynamically connected to the stationary portion, and carries an objective lens. 1 5. It should be noted that the light-emitting element, the optical guidance system (each element, the optical guidance system itself, the scanning device, the light receiving device, and the actuator applied to the optical unit and the device according to the present invention may be devices, systems, and components that are well known to us. Or the components or structures that we are familiar with. The device shown in Figures 1 to 4 is designed to read existing information and write information to an information carrier on an information carrier with an information track, which specifically refers to a An optical disc, such as a DVD-RW. In order to read information from the optical disc, the light emitting device 5 generates a continuous beam which passes through the beam shaper 14, the beam splitter 7, the collimator lens 9 and the mirror surface, and through the objective lens. 〖5 Focus on the disc and scan the "point. The beam is reflected by the disc, so the reflected beam in the information track of the disc contains information corresponding to a series of existing basic information features. The reflected beam passes through the objective lens 15, mirror 11, sight collimator The lens 9, the beam splitter 7, and the servo lens 13 are guided to the optical receiving device 17, so that the optical receiving device 17 provides Information detection signal. In order to write information to the optical disc, the light emitting device 5 generates a light beam corresponding to the written information and guided to the objective lens 15 through an optical guidance system, thereby serially scanning the optical disc at the scanning point. The continuous basic information characteristics on the signal are produced. In the optical device according to the present invention, the light-emitting device is mounted on the support in a thermally insulated manner. In the optical unit shown in FIGS. 1-4, the light-emitting device 5 is mounted on a Sheet metal bracket made of copper, aluminum or other suitable metal material 87054 200418006 2 1 < in opening 2 1 a. A thermally insulated plate-type element is provided between the bracket 21 and the support 1 23. The insulating plate-type element 23 has an opening 23a, which serves as a window through which a light beam generated by the light-emitting device 5 passes. In this embodiment, the insulating element is made of polymethyl methacrylate. The opening 23a, the insulating element 23 can also provide a transparent part in front of the light emitting device 5. The bracket 2m and the insulating element 23 are fixed to the support 1 by screws. Of course, other suitable fixing methods such as sticking can also be used. If necessary, the metal bracket 21 may be provided with cooling fins to improve heat transfer to the environment. According to the present invention, the embodiment of the optical player shown in FIG. 5 has a disc 103 rotatably supporting an optical disc 103 (in this embodiment In the frame 100 of a rotating shaft 102 of a DVD + RW), there are two slider device units 106 magnetic | E104, in which the magnetic vehicle is fixed on the frame 100. The device unit 106 Also included is a drive coil 108 in cooperation with a magnetic yoke. The drive coil 108 is arranged to perform a radial translational movement along a guide pump 112 indicated only by a sketch. The slider 11 can be as shown in Figs. The slider 1a described in 4, but another option is an actuator with another slider and an optical unit. The optical player also has a disc drive unit 114 that rotates the disc 1 103 in the rotation direction R around the rotation shaft 102. It was found that when a light emitting device with a high power is provided, such an optical playback device satisfies the high precision requirements regarding the position of these optical lens systems, light emitting devices and light receiving devices, as well as the optical guidance. The precision of the mutual position and arrangement of certain optical components of the system is required. From the measurement, it seems that in that case, in the operation of the light-emitting device, the support 87054 -10-200418006 almost does not heat and even the support M is heated and to a small extent (deformation and displacement) ), Even if there is deformation and displacement, it can be completely compensated by the general application control electronics and components of the optical player. Due to this property: the optical unit and the optical player according to the present invention are particularly suitable for writing into an optical system, and the τ 舄 entry process cannot be stopped due to the calibration of the entire setting. It is worth noting that the invention is not limited to the examples shown here. For example, knots:, up to "some elements or omissions-components are also possible. Moreover, the light unit and the optical player can also represent magneto-optical elements. [Brief description of the drawings] Table ^ shows an embodiment of the π-point early learning in a perspective view and a partial disassembly state diagram according to the present invention; solid 2 to describe the embodiment of FIG. 1 at different angles; Along the picture! Fig. 4 is a cross-sectional view taken along line IV-IVk of Fig. 1; and Fig. 5 is a diagram showing an embodiment of the optical player of the present invention. [Illustration of representative symbols in the figure] 1 support la slider 3a car bearing surface 3b car bearing surface 5 light emitting device 7 beam splitter 9 collimator lens 87054 200418006 11 mirror surface 13 servo lens 14 beam shaper 15 objective lens 15a optical Shaft 17 Optical receiving device 19 Focusing actuator 21 Plate holder 21a Opening 23 Thermal insulation plate element 23a Opening 100 Frame 102 Rotating shaft 103 Optical disc 104 Magnetic car 106 Slider lens unit 108 Drive coil 110 Slider 112 Guide shaft 114 Disc Drive unit ^ 87054 -12-