201102744 六、發明說明： 【發明所屬之技術領域】 本發明係一種投影裝置’尤其是指一種可移動鏡頭的 投影裝置。 【先前技術】 投影機已經成為多媒體撥放工具的一種，並且也普遍 的被使用在大部份的家庭中，而一般的投影機若欲調整投 射影像在投影布幕（成像面）上的位置’必須藉由移動投影 籲機的位置，來調整影像投射在適當或指定的位置，但若擺 放投影機的空間受限，或是擺放的位置不便被任意移動， 例如擺放在較高位置，將造成影像位置調整的不便。 後來有發展一些投影機’利用鏡頭移動來控制由該鏡 頭才又射而出的影像在成像面上的位置，而控制鏡頭移動動 作的方式’ 一般有手動控制及電動控制，其中手動控制方 式的投影機，在鏡頭移動（lens shift)的設計上有單一軸向移 擊動（&疋上下移動），或者是二軸向移動（上下及左右的 移動）的方式’然而’無論哪種方式都會有鏡頭撞壁的缺 點。更具體來說’設計鏡頭的最佳移動範圍時，是藉由機 構件當作「牆壁」，做為鏡頭可移動行程的極限，若當使 用者未察覺已經移動到「牆壁」，即移動行程的極限，仍 繼f施力的話’可能會造成機構件與齒輪卡死，甚至齒輪 的朋毁以及馬達的損壞，而造成裝置的損壞。另外，利用 電動控制方式的投影機，目前在設計上都是單一軸向移 動’主要是在鏡頭可移動行程的極限位置設置開關，當鏡 201102744 頭在碰到該開關的時候，即可控制鏡頭移動的動作停止， 然而若用於鏡頭可二軸向移動的投影機時，若利用少數開 關的偵測，將造成偵測精度的降低，若是藉由需裝設更多 個開關在偵測位置上的方式，以提高偵測的精度，則勢必 造成元件成本的提高。因為鏡頭移動的範圍並非僅一軸向 的上下或左右的移動，而是由鏡頭的上下及左右的可移動 行程極限所圍成的區域’因此，若欲以開關的方式來控制， 勢必需在此區域的邊界上設置更多的開關，此舉將不但造 •成設計上的難度，更也增加製造的成本。 【發明内容】 為改善上述的缺點，本發明提供一種投影裝置，包括 有一鏡頭移動部，該鏡頭移動部更包括一基座，具有一透 孔、以及利用一第一驅動模組驅動產生移動的鏡筒，該投 衫裝置更包括：一感應元件，用以在該鏡筒與該基座透孔 魯内緣接觸時，產生一感應訊號、一處理器，對應該感應訊 號’控制該第一驅動模組停止驅動該鏡筒移動。 本發明的投影裝置利用感應元件在該鏡頭接觸該基 座透孔内緣時，產生的感應訊號，以表示該鏡頭已到達可 移動行程的極限位置，而依據該感應訊號，由該處理器控 制該影像裝置的鏡頭停止繼續移動，因此，本發明的投影 裝置可以在該鏡頭以二維方向移動到達投影裝置的鏡頭可 移動的極限位置時，自動地停止繼續移動，所以可以避免 鏡頭移動的過行程發生，防止元件的損壞或是誤動作的發 201102744 生。另外，於本發明中的感應元件是採用 壓電元件、銅箔 或是軟性電祕，岐一在該基座透孔⑽，所以不僅 可以有效且正相防止過行程的發生 ，更可以降低感應元 件使用數量的優點。 A讓本發明之上述和其他目的、特徵、和優點能更明 頁易1 τ文特舉出數個實施例，並配合所附圖式作詳細 說明。 【實施方式】 清參閱圖1’係本發明實施例之投影裝置的元件方塊 圖。本發明實施例是一投影裝置，該投影裝置包括：一鏡 頭移動部ΗΠ、一感應元件102、一警示單元1〇3以及一處 理器104。 -土圖2是本發明實施例之投影裝置的該鏡頭移動部結構 不意圖，用以繪示說明該鏡頭移動部1〇1的結構組成。圖 3是本發明實施例之投影裝置隱藏一鏡筒後的該鏡頭移動 部結構示意圖。 靖同時參閱圖2及圖3 ’該鏡頭移動部ιοί包括一基 座1011，具有一透孔1018、一第一壓條i〇i2a及一第二壓 條1012b，延一第一方向平行鎖附於該基座1〇11，以形成 第一溝槽、一第一移動平台1〇13,裝設於該基座1〇11， 並且可沿該第一方向在該第一溝槽内滑動或移動、一第三 壓條1012c及一第四壓條1012d，延一第二方向平行鎖附 於該第一移動平台1〇13，以形成一第二溝槽、一第二移動 平台1014’裝設於該第一移動平台丨3,並且可沿該第二 201102744 方向在該第二溝槽内滑動或移動、一第一驅動模組1015， 用以驅動該第一移動平台1013移動、一第二驅動模組 1016,用以驅動該第二移動平台1014移動、以及一鏡筒 1017 ’用以投射影像光束，其中該鏡筒1〇17穿過該基座 1011的透孔1018與該第一、第二移動平台1014，並固鎖 於該第二移動平台1014。 於本發明實施例中，該第一及該第二驅動模組1016更 包括一馬達、一螺桿、以及一滑塊。當該第一及第二驅動 籲模組1016欲驅動該第一及第二移動平台1〇14做對應的移 動時，該馬達接收到控制訊號後，啟動該馬達的轉子轉動， 連動該轉子的齒輪透過齒輪組的傳動，而帶動螺桿旋轉， 因為螺桿的旋轉而使裝設於螺桿上的滑塊沿著螺桿的軸方 向進行直線的移動，而滑塊與第一或第二移動平台1〇14連 接，因此，該第一或第一移動平台1〇14會對應該滑塊產生 移動。所以藉由上述的方式，經由控制即可使得該第一移 動平台1013及該第一移動平台1〇14在對應的第一方向且/ 籲或第二方向移動，因而可以調整該鏡筒1017產生位移，以 改變投射影像的位置。 請再參閱圖1，本發明實施例之投影裝置的該感應 元件102，用以在該鏡筒到達移動的極限位置時，產生一 感應訊號。 該警示單元103,依據一警示訊號，發出一警示訊 息。 一處理器104，對應該感應訊號，控制該驅動模組 201102744 停止驅動該鏡筒移動，並且發出該警示訊號》 更具體來說，該感應元件102係裝設於該鏡筒1017 移動至該投影像置可移動鏡頭的極限位置，藉由感應元件 102在該極限位置與該鏡筒丨〇17的接觸，產生該感應訊 號，以表示該鏡筒1017的移動已到達極限位置，藉由該感 應訊號的產生及輸出到該處理器1〇4，由該處理器1〇4對 該感應訊號進行比較該感應訊號值是否超過一預定值，而 於超過該預定值時，發出控制訊號給該第一、第二驅動模 _組1016，以控制該鏡筒1〇17停止繼續往原方向移動，並 且該處理器104發出該警示訊號至該警示單元1〇3,該警 示單元103於收到該警示訊號後，會產生進行一警示操 作，例如：於投射的影像中顯示警示訊息或利用一警示燈 表示警示訊息’以告知使用者該投影裝置的鏡頭移動已到 達極限位置。 請參閱圖4’是本發明第一實施例鏡頭移動部的前 鲁視圖，圖4僅繪示該鏡頭移動部ι〇1的該基座1〇11及該鏡 1017筒，用以說明該感應元件1〇2的裝設位置。 於本發明第一實施例中，該感應元件1〇2是壓電元 件’該壓電元件是環繞裝設於基座1〇11的透孔1〇18内緣， 當該鏡筒1017移動至該基座iou透孔1〇18内緣的位置 時，即該投影裝置的鏡頭可移動極限位置，該鏡筒1〇17的 外筒面會與繞設於該基座1〇11透孔1〇18内緣的壓電元件 接觸，當該鏡筒1017持續移動而讓該鏡筒1〇17的外筒面 與壓電元件接觸的位置產生壓力，使得該壓電元件受到壓 201102744 迫，因此輸出的該感應訊號值會依據壓力的大小而呈正比 的變化。當該處理器104接收到該感應訊號時，比較該感 應訊號值是否超過一預定值，當該感應訊號值超過該預定 值時，該處理器104發出控制訊號，控制該第一、第二驅 動模組1016停止驅動該第一、第二移動平台1014繼續朝 原移動方向移動。相同地，請參閱圖5,該壓電元件亦可 以環繞裝設於該鏡筒1017的外筒面上，也可以達成相同的 效果。 本發明第二實施例中，該感應元件102是導電元 件，例如：銅鉑片、軟性電路板，該導電元件是環繞裝設 於該鏡筒1017的外筒面，且該基座1〇11的材質是導電材 料，其中該導電元件與該基座1011的其中之一需接地，另 一則與該處理器104的高準位接腳連接。當該鏡筒1017持 續移動而讓該鏡筒1017上的導電元件與該基座1〇11的透 孔1018内緣接觸時，而使得該處理器1〇4的高準位腳位因 為該鏡筒1017與該基座1011的接觸而導通接地，在高準 位腳位產生一個由高準位到低準位的感應訊號。該處理器 104在收到該感應訊號時’發出控制訊號，控制該第一、 第二驅動模組1016停止驅動該第一、第二移動平台1〇14 繼續朝原移動方向移動。 附帶一提’於本發明第二實施例中，該基座1 〇 11材 質亦可為非導電材料’而可以將另一導電材料裝設於該基 座1011的透孔1018内緣來實施。 201102744 本發明雖以數個實施例揭露如上，然其並非用以限 定本發明的範圍，任何熟習此項技藝者，在不脫離本發明 之精神和範圍内，當可做些許的更動與潤飾，因此本發明 之保護範圍當視後附之申請專利範圍所界定者為準如圖4 所示為本發明實施例之電路圖。 【圖式簡單說明】 圖1係本發明實施例之投影裝置的元件方塊圖。 圖2係是本發明實施例之投影裝置的該鏡頭移動 部結構示意圖。 圖3是本發明實施例之投影裝置隱藏該鏡筒後的 該鏡頭移動部結構示意圖。 圖4是本發明第一實施例鏡頭移動部的前視圖。 圖5係本發明第一實施例鏡頭移動部的前視圖。 201102744 【主要元件符號說明】 ίο-投影裝置 101- 鏡頭移動部 102- 感應元件 103- 警示單元 104- 處理器 1011-基座 • 1012a-第一壓條 1012b-第二壓條 1012c-第三壓條 1012d-第四壓條 1013- 第一移動平台 1014- 第二移動平台 1015- 第一驅動模組 1016- 第二驅動模組201102744 VI. Description of the Invention: [Technical Field] The present invention relates to a projection apparatus', particularly to a projection apparatus of a movable lens. [Prior Art] The projector has become a type of multimedia playback tool, and is also commonly used in most homes, and a general projector wants to adjust the position of the projected image on the projection screen (imaging surface). 'The position of the projection machine must be moved to adjust the image to the appropriate or specified position, but if the space for the projector is limited, or the position is inconvenient to be moved arbitrarily, for example, placed at a higher position. The position will cause inconvenience in adjusting the image position. Later, some projectors were developed to use the lens movement to control the position of the image that was shot from the lens on the imaging surface, and the way to control the movement of the lens' generally has manual control and electric control, of which manual control The projector has a single axial shift (& 疋 up and down movement) or a two-axis movement (up and down and left and right movement) in the design of the lens shift. However, either way There are drawbacks to the lens hitting the wall. More specifically, 'the optimal range of movement of the lens is made by using the machine component as a "wall" as the limit of the movable stroke of the lens. If the user does not notice that he has moved to the "wall", the movement is moved. The limit, if the force is still applied, may cause the components and gears to be stuck, even the gears of the gears and the damage of the motor, resulting in damage to the device. In addition, the projector using the electric control mode is currently designed to be a single axial movement 'mainly at the limit position of the movable stroke of the lens. When the lens 201102744 head touches the switch, the lens can be controlled. The moving action stops. However, if the projector is used for two-axis movement of the lens, if the detection of a few switches is used, the detection accuracy will be reduced. If more switches need to be installed at the detection position. The above method to improve the accuracy of detection will inevitably lead to an increase in component cost. Because the range of lens movement is not only an axial up and down or left and right movement, but an area enclosed by the upper and lower left and right movable stroke limits of the lens. Therefore, if you want to control by means of a switch, it is necessary to More switches are placed on the boundaries of this area, which will not only make design difficult, but also increase the cost of manufacturing. SUMMARY OF THE INVENTION In order to improve the above disadvantages, the present invention provides a projection apparatus including a lens moving portion, the lens moving portion further includes a base having a through hole and driving by using a first driving module to generate movement The lens tube further includes: an inductive component for generating an inductive signal and a processor when the lens barrel is in contact with the inner edge of the through hole of the base, corresponding to the sensing signal 'controlling the first The drive module stops driving the lens barrel to move. The projection device of the present invention uses an inductive component to generate an inductive signal when the lens contacts the inner edge of the base through hole to indicate that the lens has reached the limit position of the movable stroke, and is controlled by the processor according to the sensing signal. The lens of the image device stops moving. Therefore, the projection device of the present invention can automatically stop moving when the lens moves in a two-dimensional direction to reach a limit position at which the lens of the projection device can move, so that the lens can be prevented from moving. The trip occurs to prevent damage to the component or malfunction of the 201102744. In addition, the sensing element in the present invention adopts a piezoelectric element, a copper foil or a soft electric secret, and the first through hole (10) in the base can not only effectively and positively prevent the occurrence of overtravel, but also reduce the induction. The advantage of the number of components used. The above and other objects, features, and advantages of the present invention will become more apparent from the description of the appended claims. [Embodiment] Referring to Fig. 1', an elementary block diagram of a projection apparatus according to an embodiment of the present invention is shown. The embodiment of the invention is a projection device comprising: a lens moving portion ΗΠ, an inductive element 102, an alerting unit 1〇3, and a processor 104. The earth moving figure 2 is a structure of the lens moving portion of the projection apparatus according to the embodiment of the present invention, and is not intended to illustrate the structural composition of the lens moving unit 1〇1. FIG. 3 is a schematic structural view of the lens moving portion after the projection device hides a lens barrel according to an embodiment of the present invention. Referring to FIG. 2 and FIG. 3, the lens moving part ιοί includes a base 1011 having a through hole 1018, a first bead i〇i2a and a second bead 1012b, and the first direction is parallelly locked to the a pedestal 1 〇 11 to form a first groove, a first moving platform 1 〇 13 , mounted on the pedestal 1 〇 11 , and slidable or movable in the first groove along the first direction, a third bead 1012c and a fourth bead 1012d are attached to the first moving platform 1〇13 in a second direction to form a second groove, and a second moving platform 1014′ is mounted on the first a mobile platform 丨3, and slidable or movable in the second trench along the second 201102744 direction, a first driving module 1015 for driving the first mobile platform 1013 to move, a second driving module 1016, for driving the second moving platform 1014 to move, and a lens barrel 1017' for projecting an image beam, wherein the lens barrel 1〇17 passes through the through hole 1018 of the base 1011 and the first and second movements The platform 1014 is locked to the second mobile platform 1014. In the embodiment of the present invention, the first and second driving modules 1016 further include a motor, a screw, and a slider. When the first and second driving and firing modules 1016 are to drive the first and second moving platforms 1 to 14 to perform corresponding movements, after receiving the control signal, the motor starts the rotation of the rotor of the motor, and interlocks the rotor. The gear passes through the transmission of the gear set to drive the screw to rotate. Because of the rotation of the screw, the slider mounted on the screw moves linearly along the axial direction of the screw, and the slider and the first or second moving platform 1〇 14 is connected, so that the first or first moving platform 1〇14 will move the slider. Therefore, by the above manner, the first moving platform 1013 and the first moving platform 1〇14 can be moved in the corresponding first direction and/or the second direction by the control, so that the lens barrel 1017 can be adjusted. Displacement to change the position of the projected image. Referring to FIG. 1, the sensing component 102 of the projection apparatus of the embodiment of the present invention generates an inductive signal when the lens barrel reaches a limit position of movement. The alert unit 103 sends a warning message according to a warning signal. A processor 104, corresponding to the sensing signal, controls the driving module 201102744 to stop driving the lens barrel and sends the warning signal. More specifically, the sensing element 102 is mounted on the lens barrel 1017 to move to the projection The sensing signal is generated by the contact of the sensing element 102 with the lens barrel 17 at the extreme position of the movable lens to indicate that the movement of the lens barrel 1017 has reached the limit position, by the sensing The signal is generated and outputted to the processor 1〇4, and the processor 1〇4 compares the sensing signal to whether the sensing signal value exceeds a predetermined value, and when the predetermined value is exceeded, sends a control signal to the first First, the second driving mode_group 1016, to control the lens barrel 1〇17 to stop moving in the original direction, and the processor 104 sends the warning signal to the warning unit 1〇3, the warning unit 103 receives the After the warning signal, an alert operation is generated, for example, displaying a warning message in the projected image or using a warning light to indicate the warning message to inform the user of the lens shift of the projection device. To limit position has been reached. 4 is a front view of the lens moving part of the first embodiment of the present invention, and FIG. 4 only shows the base 1〇11 and the lens 1017 of the lens moving part ι1 for illustrating the sensing. The mounting position of the component 1〇2. In the first embodiment of the present invention, the sensing element 1〇2 is a piezoelectric element. The piezoelectric element is surrounded by an inner edge of the through hole 1〇18 of the base 1〇11, when the lens barrel 1017 is moved to When the pedestal iou is in the position of the inner edge of the through hole 1 〇 18, that is, the lens of the projection device can be moved to the extreme position, the outer cylindrical surface of the lens barrel 1 〇 17 and the through hole 1 of the pedestal 1 〇 11 The piezoelectric element of the inner edge of the crucible 18 is in contact with each other, and when the lens barrel 1017 continues to move, a pressure is generated at a position where the outer cylinder surface of the lens barrel 1〇17 is in contact with the piezoelectric element, so that the piezoelectric element is pressed by the 201102744, so The value of the induced signal output will be proportional to the magnitude of the pressure. When the processor 104 receives the sensing signal, comparing whether the sensing signal value exceeds a predetermined value, when the sensing signal value exceeds the predetermined value, the processor 104 sends a control signal to control the first and second driving. The module 1016 stops driving the first and second moving platforms 1014 to continue moving in the original moving direction. Similarly, referring to Fig. 5, the piezoelectric element can also be mounted around the outer cylinder surface of the lens barrel 1017, and the same effect can be achieved. In the second embodiment of the present invention, the sensing element 102 is a conductive element, such as a copper platinum plate, a flexible circuit board, and the conductive element is surrounded by an outer cylinder surface mounted on the lens barrel 1017, and the base 1 11 The material is a conductive material, wherein one of the conductive element and the base 1011 needs to be grounded, and the other is connected to the high level pin of the processor 104. When the lens barrel 1017 continues to move to make the conductive element on the lens barrel 1017 contact the inner edge of the through hole 1018 of the base 111, the high-level position of the processor 1〇4 is caused by the mirror. The contact of the cannula 1017 with the base 1011 is grounded, and an inductive signal from a high level to a low level is generated at the high level position. The processor 104 sends a control signal when the sensing signal is received, and controls the first and second driving modules 1016 to stop driving the first and second moving platforms 1 to 14 to continue moving in the original moving direction. Incidentally, in the second embodiment of the present invention, the susceptor 1 〇 11 may be made of a non-conductive material, and another conductive material may be disposed on the inner edge of the through hole 1018 of the base 1011. The present invention is disclosed in the above several embodiments, and is not intended to limit the scope of the present invention, and those skilled in the art can make some modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of the present invention is defined by the scope of the appended claims. FIG. 4 is a circuit diagram of an embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of components of a projection apparatus according to an embodiment of the present invention. Fig. 2 is a block diagram showing the structure of the lens shifting portion of the projection apparatus according to the embodiment of the present invention. FIG. 3 is a schematic structural view of the lens moving portion after the projection device hides the lens barrel according to the embodiment of the present invention. Figure 4 is a front elevational view of the lens moving portion of the first embodiment of the present invention. Figure 5 is a front elevational view of the lens moving portion of the first embodiment of the present invention. 201102744 [Description of main component symbols] ίο-Projection device 101 - Lens shifting section 102 - Inductive component 103 - Warning unit 104 - Processor 1011 - Base • 1012a - First bead 1012b - Second bead 1012c - Third bead 1012d - Fourth pressing strip 1013 - first mobile platform 1014 - second mobile platform 1015 - first driving module 1016 - second driving module