201248296 六、發明說明： 【發明所屬之技術領域】 本發明係與投職有關，更和言之是指—種投影機之鏡 頭蓋開閉裝置。 【先前技術】 隨著影像科技的進步，投影機廣泛用於簡報、會議、教育 訓練或影視娛樂，而逐漸變成現代人常用的視訊設備。投影機 主要係藉一鏡頭將影像資訊投射至一成像面，若鏡頭受到刮傷 或沾染灰塵’會影響投射時之成像品質。因此，一般投影機皆 配設有一鏡頭蓋，用以保護鏡頭，避免鏡頭刮傷或髒污等。然 而，由於該鏡頭盍裸露盍設於投影機外側，且投影機使用前需 手動將該鏡頭蓋取下，使得該鏡頭蓋容易掉落遺失，而引起使 用者之困擾。 為改善上述缺點，習知設計有一種電動式鏡頭蓋，如中華 民國公告第512255號專利’其係利用電源之開啟與關閉來控 制步進馬達驅動齒輪及齒條結構來帶動鏡頭蓋開啟及關閉，且 可避免鏡頭蓋脫落遺失。然而，上述之電動式鏡頭蓋不僅構件 複雜而維修不易，且須額外耗費電力來驅使馬達運轉。另外， 以電動方式操控鏡頭蓋之開閉’若使用者未將鏡頭蓋蓋上即先 將投影機關機，則需再次開機供電才能將鏡頭蓋蓋上，而影響 使用者操作之便利性。 3 201248296 f發明内容】 +有鏗於此，本發明之主要目的在於提供一種投影機之鏡頭 盍開閉裝置，可自賴控鏡戦之_，料需花費額外之電 源。 緣以達成上述目的’本發明所提供有一種投影機之鏡頭蓋 開閉裝置，該投影機具有—發熱光源、—鏡_及―鏡頭蓋， 其中’該發熱絲係-用以在該郷機啟树，產生影像光束 及熱能者；該鏡頭用以將前述的影像光束投射至一成像面，·該 鏡頭蓋可於—遮蔽該鏡頭之第—位置、以及—遠離該鏡頭之第 -位置之間往復移動’·該鏡頭蓋卿裝置包含有—驅動裝置， 與該鏡頭蓋連接，且具有一熱變形件，該熱變形件係位於一可 接收該發熱光源所產生之熱能的位置上，用以在接收該發熱光 源所產生之織後，產生變形而使娜練置帶_鏡頭蓋由 該第一位置移動至該第二位置。 依據上述構思’本發明之鏡頭蓋開閉裝置更包含一回復裝 置’該喊裝置與該綱蓋連接，肋在駿雜關時提供 一作用力’藉以帶動該鏡頭蓋由該第二位置移動至該第一位 置。 【實施方式】 為能更清楚地說明本發明’茲舉較佳實施例並配合圖示詳 4 201248296 細說明如後。 請參閱圖1 ’為本發明第一較佳實施例所提供之投影機 100 ’該投影機100包含有一發熱光源110、一鏡頭12〇、一鏡 頭蓋130以及一鏡頭蓋開閉裝置i。其中，該發熱光源11()用 以在該投影機100啟動時’產生影像光束及熱能。該鏡頭12〇 用以將前述的影像光束投射至一絲面(圖未示）。該鏡頭蓋 130用以在該投影機1〇〇關閉時遮蔽該鏡頭12〇。另外，因上 述之該發熱光源110、該鏡頭12〇以及該鏡頭蓋13〇皆屬習知 技藝，故其原理及詳細結構，於此容不再贅述。 該鏡頭蓋開閉裝置1具有一驅動裝置1〇，且該驅動裝置 10包含有一熱變形件11、一放大機構12以及一傳動機構13。 該熱變形件11係-由單向形狀記憶合金（Shape Mem〇ry201248296 VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to a job, and more particularly to a mirror cover opening and closing device of a projector. [Prior Art] With the advancement of imaging technology, projectors are widely used in newsletters, conferences, educational training, or film and television entertainment, and gradually become video devices commonly used by modern people. The projector mainly uses a lens to project image information onto an image surface. If the lens is scratched or contaminated with dust, it will affect the image quality when projecting. Therefore, the projector is equipped with a lens cover to protect the lens from scratches or dirt. However, since the lens is exposed on the outside of the projector and the lens cover is manually removed before use, the lens cover is easily lost and lost, causing trouble to the user. In order to improve the above shortcomings, there is a conventional electric lens cover, such as the Republic of China Announcement No. 512255, which uses the opening and closing of a power source to control the stepping motor drive gear and the rack structure to drive the lens cover to open and close. And can avoid the loss of the lens cover. However, the above-described electric lens cap is not only complicated in structure but also difficult to maintain, and requires additional power to drive the motor. In addition, the lens cover is electrically operated to open and close. If the user does not cover the lens cover, the projector must be powered on again to cover the lens cover, which affects the convenience of the user. 3 201248296 f Summary of the Invention] In view of this, the main object of the present invention is to provide a lens 盍 opening and closing device for a projector, which can be powered by an additional power source. In order to achieve the above object, the present invention provides a lens cover opening and closing device for a projector, the projector having a heat source, a mirror, and a lens cover, wherein the heat wire is used to open the machine a tree that produces an image beam and thermal energy; the lens is used to project the aforementioned image beam onto an imaging surface, the lens cover can be between - shielding the first position of the lens, and - away from the first position of the lens Reciprocating movement · The lens cover device comprises a driving device connected to the lens cover and having a thermal deformation member located at a position capable of receiving thermal energy generated by the heat generating source After receiving the weaving generated by the heat generating light source, deformation occurs to cause the lens cover to move from the first position to the second position. According to the above concept, the lens cover opening and closing device of the present invention further includes a returning device that is connected to the cover, and the rib provides a force during the twisting of the door to drive the lens cover to move from the second position to the First position. [Embodiment] The preferred embodiment of the present invention will be described more clearly and will be described in detail with reference to the drawings. 1 is a projector 100' provided in accordance with a first preferred embodiment of the present invention. The projector 100 includes a heat generating light source 110, a lens 12A, a lens cover 130, and a lens cover opening and closing device i. The heat source 11() is used to generate an image beam and thermal energy when the projector 100 is activated. The lens 12 用以 is used to project the aforementioned image beam onto a filament surface (not shown). The lens cover 130 is used to shield the lens 12 when the projector 1 is closed. In addition, since the heat source 110, the lens 12, and the lens cover 13 are all well-known in the art, the principle and detailed structure thereof will not be described again. The lens cover opening and closing device 1 has a driving device 1 , and the driving device 10 includes a thermal deformation member 11 , an amplifying mechanism 12 , and a transmission mechanism 13 . The heat deformable member 11 is made of a one-way shape memory alloy (Shape Mem〇ry)
Alloy，SMA)材質製成之線體，但不以此為限。該熱變形件 11位於該發熱光源110附近，以接收該發熱光源11〇所產生之 熱能。該熱變形件11在接收該發熱光源110產生之熱能後， 將產生變形。當然在設計上，該熱變形件η除利用形狀變化 彳’村糊長錢化、粗細變化或其他·變絲達到產生 移動力之效果。 該放大機構12包含有一第一槓桿121以及一第二槓桿 122 ’且該第一槓桿121與該第二槓桿122皆為第一類横桿。 該第-槓桿121 一端與該熱變形件u連接，另一端與該第二 槓桿122之一端連接，且該第一槓桿121之支點位於該 201248296 第一横杯121上接近連接該熱變形件η之一端。該第二横桿 122之支點122a則位於該第二槓桿122上接近連接該第一槓 桿121之一端，而使該第二槓桿另一端形成一移動量大於該熱 變形件的變形量之作用端。 該傳動機構13包含有-可撓性賴131錢數個雜 132，該可撓性線體131沿該等滾輪132設置，且連接該第二 槓桿122之另-端以及該鏡頭蓋13〇。藉此，當該投影機刚 啟動時，該發熱光源所產生11G之熱能將促使該熱變形件u 發生變形’而使該第-槓桿121與該第二槓桿122作動，而該 第二槓桿⑵之作賴字驅動該可撓性線體131而傳動該鏡頭 蓋130由-遮蔽該鏡頭12〇之第—位置ρι移動至—遠離該鏡 頭120之第二位置P2，藉以達到開啟鏡頭蓋13〇之目的。 另外，除上述實施例所用之放大機構12外，亦可使用如 圖2所示讀域構14，觀大機構Η包含有之轉軸 叹於該轉軸上之輪體142和—可撓性線體⑷’·該輪 體142具有以該轉軸141為令心之一第一圓周面似和一第 二圓周面⑽’且該第二圓周面咖之周長大於該第一圓周 面仙之周長；該可撓性線體⑷之-端與該熱變形件n連 =’另一端接設於該第-輪面142a上；該傳動機構13之可捷 2 131 二—。藉此，當該熱 2件U變形時’將透過該可撓性線體⑷帶動該輪請 轉動，並同時帶動該可撓性線體131驅動該鏡頭蓋13〇由該第 6 201248296 一位置P2移動至該第二位置p卜進而達到開啟鏡頭蓋m之 目的。當然在設計上’除上述之結構外，亦可僅使用單-槓桿， 或使用如齒輪、鏈輪等其他習知結構配合來達到相同之目的， 於此容不再贅述。 再者，須說明的是，只要該熱變形件n之長度夠長，其 變形時之變形量將可足以帶動該魏蓋l3G由該第—位置μ 移動至該第二位置Ρ2 ’此時，該綱蓋開職置丨不必透過 上述之各放大機構亦可達湖啟鏡頭蓋13G之目的。 值得-提的是，為使該投影機觸賴後，該鏡頭蓋13〇 可重新遮蔽該鏡頭12G，該鏡驢_裝置丨更包含有一回復 裝置20 ’係一彈簧，且與該鏡頭蓋130以及-固定物(圖未示） 連接’用以提供-作用力予該鏡頭蓋13〇，藉以該投影機腦 關閉後，帶動該鏡頭蓋130由該第二位置p2移動回該第一位 置P卜當然，在設計上除使用彈簧外，亦可使用彈性橡膠、 或是磁鐵磁吸等方式達到相同之目的。 而除使用上述之回復裝置20外，在設計上亦可使用雙向 形狀記憶合金材質製成之熱變形件來代替回復裴置2〇之功 能，亦即，在啟動投影機1〇〇時，熱變形件受熱而由一第一形 狀變形至一第二形狀，進而帶動該鏡頭蓋13〇由該第—位置 P1移動至該第二位置P2 ;而在投影機1〇〇關閉後，熱變形件 逐漸冷卻而由該第二形狀變形回該第一形狀時，將帶動該鏡頭 蓋130由該第二位置P2移動回該第一位置pi，進而達到自動 201248296 啟閉該鏡頭蓋130之目的。 綜合以上所述可得知，本發明之鏡頭蓋開閉裝置丨不僅可 自動操控鏡頭蓋之開閉，且不需花費額外之電源。 以上所述僅為本發明較佳可行實施例而已，舉凡應用本發 明說明書及申請專利範圍 應包含在本發明之專利範圍内 為之4效結構及製作方法變化 ，理 8 201248296 【圖式簡單說明】 圖1為本發明較佳實施例之示意圖。 圖2為本發明另一放大機構之結構圖。 【主要元件符號說明】 1鏡頭蓋開閉裝置 10驅動裝置 11熱變形件 12放大機構 121第一槓桿 121a支點 122第二槓桿 122a支點 13傳動機構 131可撓性線體132滾輪 14放大機構 141轉軸 142輪體 142a第一輪面 142b第二輪面 143可撓性線體 20回復裝置 100投影機 110發熱光源 120鏡頭 130鏡頭蓋 P1第一位置 P2第二位置 9Alloy, SMA) is made of wire, but not limited to this. The heat deforming member 11 is located near the heat generating light source 110 to receive the heat energy generated by the heat generating light source 11〇. The heat deforming member 11 will be deformed after receiving the heat energy generated by the heat generating light source 110. Of course, in design, the heat-deformable member η has the effect of generating a moving force by using a change in shape, a change in thickness, a change in thickness, or a change in other filaments. The amplifying mechanism 12 includes a first lever 121 and a second lever 122', and the first lever 121 and the second lever 122 are both a first type of crossbar. One end of the first lever 121 is connected to the heat deforming member u, and the other end is connected to one end of the second lever 122, and the fulcrum of the first lever 121 is located on the first cross cup 121 of the 201248296, and the heat deforming member η is connected. One end. The fulcrum 122a of the second crossbar 122 is located on the second lever 122 and is close to one end of the first lever 121, so that the other end of the second lever forms a working end which is larger than the deformation amount of the thermal deformation member. . The transmission mechanism 13 includes a flexible flexible body 131 disposed along the rollers 132 and connected to the other end of the second lever 122 and the lens cover 13A. Thereby, when the projector is just started, the thermal energy generated by the heat source 11G will cause the heat deformation member u to be deformed, and the first lever 121 and the second lever 122 are actuated, and the second lever (2) The lens cover 130 is driven to drive the lens cover 130 to move the lens cover 130 to the second position P2 away from the lens 120, thereby opening the lens cover 13〇. The purpose. In addition, in addition to the amplifying mechanism 12 used in the above embodiment, a read domain 14 as shown in FIG. 2 may be used, and the viewing mechanism includes a wheel body 142 and a flexible wire body on which the rotating shaft sighs. (4) '· The wheel body 142 has a first circumferential surface and a second circumferential surface (10)' with the rotating shaft 141 as a center of gravity, and the circumference of the second circumferential surface is larger than the circumference of the first circumferential surface The end of the flexible wire body (4) is connected to the heat-deformable member n = 'the other end is connected to the first-wheel face 142a; the transmission mechanism 13 can be replaced by 2 131 two. Therefore, when the heat 2 is deformed, the wheel will be rotated by the flexible wire body (4), and the flexible wire body 131 is driven to drive the lens cover 13 by the sixth 201248296 position. P2 moves to the second position p to achieve the purpose of opening the lens cover m. Of course, in addition to the above-mentioned structure, it is also possible to use only a single-lever, or use other conventional structural cooperation such as a gear, a sprocket, etc., to achieve the same purpose, and the details are not described herein. Furthermore, it should be noted that as long as the length of the thermal deformation member n is long enough, the amount of deformation during deformation may be sufficient to move the Wei cover l3G from the first position μ to the second position Ρ 2 ' at this time. The opening of the cover is not necessary for the purpose of reaching the lake lens cover 13G through the above-mentioned amplification mechanisms. It is worth mentioning that, in order to make the projector touch, the lens cover 13 重新 can re-shadow the lens 12G, the mirror 丨 device 包含 further includes a return device 20 ′ a spring, and the lens cover 130 And a fixing object (not shown) is connected to provide a force to the lens cover 13〇, whereby the lens cover 130 is moved by the second position p2 back to the first position P after the projector brain is closed. Of course, in addition to the use of springs, it is also possible to achieve the same purpose by using elastic rubber or magnetic magnetism. In addition to using the above-mentioned recovery device 20, it is also possible to use a thermal deformation member made of a bidirectional shape memory alloy material instead of the function of the recovery device 2, that is, when the projector is turned on, heat is applied. The deforming member is heated to deform from a first shape to a second shape, thereby driving the lens cover 13 to move from the first position P1 to the second position P2; and after the projector 1 is closed, the heat deforming member When the second shape is deformed back to the first shape, the lens cover 130 is moved from the second position P2 back to the first position pi, thereby achieving the purpose of automatically opening and closing the lens cover 130. In summary, it can be seen that the lens cover opening and closing device of the present invention not only automatically controls the opening and closing of the lens cover, but also does not require an additional power source. The above description is only a preferred embodiment of the present invention, and the application of the present specification and the scope of the patent application should include the four-effect structure and the manufacturing method variation within the scope of the patent of the present invention. 1 is a schematic view of a preferred embodiment of the present invention. 2 is a structural view of another amplifying mechanism of the present invention. [Main component symbol description] 1 lens cover opening and closing device 10 driving device 11 thermal deformation member 12 amplifying mechanism 121 first lever 121a fulcrum 122 second lever 122a fulcrum 13 transmission mechanism 131 flexible wire 132 roller 14 amplifying mechanism 141 rotating shaft 142 Wheel body 142a first wheel surface 142b second wheel surface 143 flexible wire body 20 recovery device 100 projector 110 heat source 120 lens 130 lens cover P1 first position P2 second position 9