1235881 九、發明說明： 【發明所屬之技術領域】 本發明提供一種投影系統之面板定位方法，尤指一種可 縮短生產時間並降低生產成本之面板定位方法。 【先前技術】 投影機乃是利用光學投影方式將影像投射至大尺寸螢 幕上的裝置，若依内部所使用的光閥(light valve)的不同， 可大致分為陰極射線管（CRT)投影機、液晶（Liquid Crystal Display，LCD)投影機、數位光源處理(DigitalLight Processing，DLP)投影機，以及矽基液晶（LiquidCrystal 〇n Silicon ’ LCoS)投影機四種主要類型。其中，[CD投影機 因運作時光線係穿透過LCD面板，所以屬於穿透式投影 機’而LCoS、DLP投影機則是靠光線反射的原理顯像，所 以又概稱為反射式投影機。 LCoS投影機的基本原理與LCD投影機相似，只是Lc〇s 投影機是利用LCoS面板來調變由光源發射出來欲於^至 螢幕的光訊號。LCoS面板是以CMOS矽晶片盔+ 々馬電路基板 及反射層，然後再塗佈液晶層後，最後以破璃平板封I LCD投影機是利用光源穿過LCD作調變，屬於穿透戈、 LCoS投影機中是利用反射的架構，所以光源發射出^的2 並不會穿透LCoS面板，屬於反射式。 、 1235881 不管是使用LCD面板或是LCoS面板，習知在將面板固 定於核心光學元件(kernel)時，係如第1圖所示，以栓孔對 位(pin to hole)方式安裝。第1圖中，面板106係先以安裝 栓108安裝於核心光學元件104上。當三片面板106皆安 裝好之後，再進行一調校步驟，使三片面板106上的影像 能疊合成像於鏡頭102上。進行此調校步驟時，通常會使 用六軸調整治具來協助。.當三片面板106上的三色影像調 整疊合之後，再使用紫外線封膠或是焊接固定的方式，將 三片面板106固定於核心光學元件104上。此種習知的面 板安裝方式，在日後紫外線封膠收縮或是其他部件熱脹冷 縮時，會產生多向的累積公差，導致影像錯位。此外，調 校三片面板106使三色影像疊合，必須耗費較多時間，影 響生產時程。 第2圖所示為另一種習知的面板安裝方式，第2圖中的 面板106係直接固定於核心光學元件104上，不透過栓孔 對位進行調整。此種安裝方式雖然可以避免產生累積公差 而導致影像錯位的可能性，但是此種習知安裝方式卻無法 使三片面板106上的三色影像疊合於最佳焦距上。 1235881 【發明内容】 因此本發明之主要目的在於提供一種具有可縮短生產 時間並降低生產成本之面板定位方法，以解決上述習知的 問題。 根據本發明之申請專利範圍，係揭露一種投影系統之面 板定位方法。該方法係先將一第一面板固定於一核心光學 元件之一第一表面，第一面板之影像會經由核心光學元件 投射至一鏡頭。接著將鏡頭調整並固定於一成像位置，再 將一第二面板與一第三面板以栓孔對位方式安裝於核心光 學元件之第二表面與第三表面。之後，微調第二面板與第 三面板之位置，以使第二面板與第三面板之影像經由核心 光學元件成像於成像位置。最後，將第二面板與第三面板 固定。 為讓本發明之上述目的、特徵、和優點能更明顯易懂， 下文特舉較佳實施方式，並配合所附圖式，作詳細說明如 下。然而如下之較佳實施方式與圖式僅供參考與說明用， 並非用來對本發明加以限制者。 【貫施方式】 請參考第3圖，第3圖為本發明一較佳實施例之示意 1235881 圖。第3圖中之投影系統包含有鏡頭202、核心光學元件 204以及三片面板206a、206 b、206c。第3圖所示之本發 明投影系統組成元件雖然與習知投影系統類似，但是其面 板安裝方式卻是截然不同。 首先，先將面板206a固定於核心光學元件204的其中 之一表面上，此時，面板206a的影像會經由核心光學元件 204投射至鏡頭202處。接著，再調整鏡頭202與核心光 學元件204的相對位置，使面板206a的影像聚焦在鏡頭 202上。此時鏡頭202的位置可稱作本投影系統之成像位 置。當面板206a、核心光學元件204與鏡頭202的相對位 置都調整且固定完成之後，再將面板206b以及面板206c 安裝於核心光學元件204上。面板206b與面板206c的安 裝方法可以是使用安裝栓· 208的栓孔對位(pin to hole)方 式。 當面板206b與面板206c以栓孔對位方式安裝完成之 後，其位置尚有些許可微調之空間。面板206b與面板206c 的影像亦是經由核心光學元件204投射至鏡頭202處，此 時，可藉由微調面板206b與面板206c的位置，使面板206b 與面板206c的影像同樣聚焦於鏡頭202上。當微調完面板 1235881 206b與面板206c的位置之後，三片面板206a、206b、206c 的影像係疊合聚焦於鏡頭202處，如此即可投射出完整的 彩色影像。最後，將面板206b與面板206c以紫外線封膠 或疋知接的方式固定’完成本發明之投影糸統的組裝過程。 本實施例中的核心光學元件204係由複數個濾光片組 成’該些濾光片具有選擇性透射或反射的功能，於特定方 向只允s午特定顏色之光線穿越或反射，例如在一方向上允 許紅光透射綠光反射。因為核心光學元件204具有此種特 性’所以可以讓不同顏色的影像經由反射或透射，聚焦於 鏡頭202上。此外，本發明所使用的面板206a、206b、2〇6c， 可以是液晶面板或矽基液晶面板，若使用液晶面板，其為 透射式成像投影，若使用矽基液晶面板，則為反射式成像 投影。本較佳實施例中以三片面板206a、206b、206c來作 說明’然於實際應用時，可以使用二片面板或是多片面板， 端視面板與核心光學元件之間的搭配設計而定。 相較於習知安裝方法，本發明之面板定位方法具有減少 調整步驟的特點，因此可以節省調整治具的費用並縮短調 整時間，還可以避免產生累積公差而導致影像錯位的可能 性。此外，因為調整步驟簡化也使得投影系統在組装過程 1235881 中沾染灰塵的可能性降低，可以提高產品的可靠度。 以上所述僅為本發明之較佳實施例，凡依本發明申請專 利範圍所做之均等變化與修飾，皆應屬本發明專利之涵蓋 範圍。 【圖式簡單說明】 第1圖為習知投影系統之示意圖。 第2圖為另一習知投影系統之示意圖。 第3圖為本發明投影系統之示意圖。 【主要元件符號說明】 102、202 鏡頭 104、204 核心光學元件 106、206a、206b、206c 面板 108、208 安裝栓 101235881 IX. Description of the invention: [Technical field to which the invention belongs] The present invention provides a panel positioning method for a projection system, particularly a panel positioning method that can shorten production time and reduce production costs. [Previous technology] Projectors are devices that use optical projection to project images onto large screens. They can be roughly divided into cathode-ray tube (CRT) projectors depending on the light valves used internally. , Liquid Crystal Display (LCD) projectors, Digital Light Processing (DLP) projectors, and Silicon Crystal (LCoS) projectors. Among them, [CD projectors are transmissive projectors because light passes through the LCD panel during operation, and LCoS and DLP projectors are developed by the principle of light reflection, so they are also referred to as reflective projectors. The basic principle of the LCoS projector is similar to that of the LCD projector, except that the LCoS projector uses the LCoS panel to modulate the light signal emitted from the light source to the screen. The LCoS panel is a CMOS silicon wafer helmet + a horse circuit board and a reflective layer, and then coated with a liquid crystal layer. Finally, it is sealed with a broken glass panel. I LCD projectors use light sources to pass through the LCD for modulation. The LCoS projector uses a reflective architecture, so the light emitted by the light source will not penetrate the LCoS panel, which is a reflective type. No. 1235881 Whether it is an LCD panel or an LCoS panel, it is known that when the panel is fixed to the core optical element (kernel), it is installed in a pin-to-hole manner as shown in Figure 1. In the first figure, the panel 106 is first mounted on the core optical element 104 with a mounting bolt 108. After the three panels 106 are installed, an adjustment step is performed to make the images on the three panels 106 superimposed on the lens 102. This adjustment step is usually assisted by a six-axis adjustment jig. After the three-color images on the three-piece panel 106 are adjusted and superimposed, the three-piece panel 106 is fixed on the core optical element 104 by using ultraviolet sealant or welding and fixing. This conventional panel installation method will cause multi-directional cumulative tolerances when the UV sealant shrinks or thermal expansion and contraction of other components in the future, resulting in image misalignment. In addition, adjusting the three-piece panel 106 to superimpose the three-color images must take more time and affect the production schedule. Fig. 2 shows another conventional panel mounting method. The panel 106 in Fig. 2 is directly fixed to the core optical element 104, and the alignment is not adjusted through the bolt holes. Although this installation method can avoid the possibility of image misalignment caused by accumulated tolerances, this conventional installation method cannot make the three-color images on the three-piece panel 106 superimposed on the optimal focal length. 1235881 [Summary of the invention] Therefore, the main object of the present invention is to provide a panel positioning method which can shorten the production time and reduce the production cost, so as to solve the above-mentioned conventional problems. According to the patent application scope of the present invention, a panel positioning method of a projection system is disclosed. In this method, a first panel is fixed on a first surface of a core optical element, and an image of the first panel is projected to a lens through the core optical element. Then, the lens is adjusted and fixed at an imaging position, and a second panel and a third panel are mounted on the second surface and the third surface of the core optical element in a pinhole alignment manner. After that, the positions of the second panel and the third panel are fine-tuned so that the images of the second panel and the third panel are imaged at the imaging position through the core optical element. Finally, fix the second panel to the third panel. In order to make the above-mentioned objects, features, and advantages of the present invention more comprehensible, the preferred embodiments are hereinafter described in detail with the accompanying drawings. However, the following preferred embodiments and drawings are for reference and description only, and are not intended to limit the present invention. [Performance Mode] Please refer to FIG. 3, which is a schematic 1235881 diagram of a preferred embodiment of the present invention. The projection system in FIG. 3 includes a lens 202, a core optical element 204, and three panels 206a, 206b, and 206c. Although the components of the projection system of the present invention shown in Fig. 3 are similar to the conventional projection system, the panel mounting method is quite different. First, the panel 206a is fixed on one of the surfaces of the core optical element 204. At this time, the image of the panel 206a is projected to the lens 202 through the core optical element 204. Then, the relative position of the lens 202 and the core optical element 204 is adjusted to focus the image of the panel 206a on the lens 202. At this time, the position of the lens 202 can be referred to as the imaging position of the projection system. After the relative positions of the panel 206a, the core optical element 204 and the lens 202 are adjusted and fixed, the panel 206b and the panel 206c are mounted on the core optical element 204. The panel 206b and the panel 206c may be mounted using a pin to hole method using a mounting bolt 208. After the panel 206b and the panel 206c are installed in a bolt hole alignment mode, there is still some room for fine adjustment. The images of the panels 206b and 206c are also projected to the lens 202 via the core optical element 204. At this time, the images of the panels 206b and 206c can be focused on the lens 202 by finely adjusting the positions of the panels 206b and 206c. After fine-tuning the positions of the panels 1235881 206b and 206c, the images of the three panels 206a, 206b, and 206c are superimposed and focused on the lens 202, so that a complete color image can be projected. Finally, the panel 206b and the panel 206c are fixed in an ultraviolet sealant or a known manner to complete the assembly process of the projection system of the present invention. The core optical element 204 in this embodiment is composed of a plurality of filters. These filters have the function of selective transmission or reflection, and only allow light of a specific color to pass through or reflect in a specific direction, for example, on one side. Red light is allowed to pass through and reflected by green light. Because the core optical element 204 has such a feature ', images of different colors can be focused on the lens 202 through reflection or transmission. In addition, the panels 206a, 206b, and 20c used in the present invention may be a liquid crystal panel or a silicon-based liquid crystal panel. If a liquid crystal panel is used, it is a transmissive imaging projection. If a silicon-based liquid crystal panel is used, it is a reflective imaging. projection. In the preferred embodiment, three panels 206a, 206b, and 206c are used for explanation. 'In practice, two panels or multiple panels may be used, depending on the design of the matching between the panel and the core optical components. . Compared with the conventional installation method, the panel positioning method of the present invention has the characteristics of reducing the adjustment steps, so it can save the cost of adjusting the jig and shorten the adjustment time, and also avoid the possibility of the image misalignment caused by the accumulated tolerance. In addition, because the adjustment steps are simplified, the projection system is less likely to be contaminated by dust during the assembly process 1235881, which can improve the reliability of the product. The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the scope of the patent application of the present invention shall fall within the scope of the patent of the present invention. [Schematic description] Figure 1 is a schematic diagram of a conventional projection system. FIG. 2 is a schematic diagram of another conventional projection system. FIG. 3 is a schematic diagram of a projection system according to the present invention. [Description of Symbols of Main Components] 102, 202 Lens 104, 204 Core Optical Elements 106, 206a, 206b, 206c Panels 108, 208 Mounting Bolts 10