TWI467311B - Projection apparatus - Google Patents
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- TWI467311B TWI467311B TW101135321A TW101135321A TWI467311B TW I467311 B TWI467311 B TW I467311B TW 101135321 A TW101135321 A TW 101135321A TW 101135321 A TW101135321 A TW 101135321A TW I467311 B TWI467311 B TW I467311B
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Description
本發明係關於一種投影裝置，尤指一種使用球面透鏡之非遠心投影鏡頭。The present invention relates to a projection device, and more particularly to a non-telecentric projection lens using a spherical lens.
隨著科技日新月異，投影裝置在家庭、娛樂或商務用途上已逐漸扮演著不可或缺的角色。傳統投影裝置係由一光閥以及一投影鏡頭所組成，且光閥用於產生影像，並藉由投影鏡頭放大且投射至一投影幕上。With the rapid development of technology, projection devices have gradually played an indispensable role in family, entertainment or business use. The conventional projection device is composed of a light valve and a projection lens, and the light valve is used to generate an image, and is enlarged by the projection lens and projected onto a projection screen.
一般投影裝置可區分為遠心投影裝置與非遠心投影裝置。由於非遠心投影裝置之主光線與光軸不平行，使得主光線是以一角度射入變焦投影鏡頭，因此投影畫面可在投影幕上朝上偏移，以符合需求。於傳統非遠心投影裝置中，為了節省成本，需使用非球面透鏡來縮減投影鏡頭中的透鏡數量，且非球面透鏡通常是由塑膠所構成，以降低透鏡成本。然而，當投影鏡頭中使用大量非球面透鏡時，非球面透鏡之間的光學成像上的匹配並不容易，因此在製作投影鏡頭時容易導致良率不佳。並且，隨著投影裝置的亮度越來越高，例如：達到2500到3000流明，光源所產生的溫度越高，使得投影鏡頭需承受越高的溫度變化。然而，由塑膠所構成之非球面透鏡具有高膨脹係數，因此在高溫度變化的情況下容易會有脫膜或光學特性 的變化，使得投影鏡頭無法在高溫度變化下維持穩定的成像。Generally, the projection device can be divided into a telecentric projection device and a non-telecentric projection device. Since the chief ray of the non-telecentric projection device is not parallel to the optical axis, the chief ray is incident on the zoom projection lens at an angle, so that the projected image can be shifted upward on the projection screen to meet the demand. In conventional non-telecentric projection devices, in order to save cost, an aspherical lens is used to reduce the number of lenses in the projection lens, and the aspherical lens is usually made of plastic to reduce the cost of the lens. However, when a large number of aspherical lenses are used in the projection lens, the optical imaging matching between the aspherical lenses is not easy, and thus it is easy to cause a poor yield when manufacturing the projection lens. Moreover, as the brightness of the projection device becomes higher and higher, for example, reaching 2500 to 3000 lumens, the higher the temperature generated by the light source, the higher the temperature variation of the projection lens. However, an aspherical lens made of plastic has a high coefficient of expansion, so it is easy to have a release film or optical property in the case of a high temperature change. The change makes the projection lens unable to maintain stable imaging under high temperature changes.
有鑑於此，降低投影裝置受到溫度變化的影響，且滿足投影裝置具有輕薄短小之特性，以節省成本，實為業界努力之目標。In view of this, it is an industry goal to reduce the influence of temperature changes on the projection device and to satisfy the characteristics that the projection device is light, thin, and short to save cost.
本發明之主要目的之一在於提供一種投影裝置，以降低受到溫度變化的影響，並節省成本。One of the main objects of the present invention is to provide a projection apparatus to reduce the influence of temperature changes and to save costs.
為達上述之目的，本發明提供一種投影裝置，用於投射一影像至一投影幕上。投影裝置包含有一光閥以及一非遠心投影鏡頭。光閥用於提供影像。非遠心投影鏡頭包含有複數個球面透鏡，用於投射影像，且球面透鏡包含有一第一透鏡組以及一第二透鏡組。第一透鏡組設置於光閥與投影幕之間，且具有一負折射率，其中第一透鏡組包含有一第一彎月型透鏡。第二透鏡組設置於第一透鏡組與光閥之間，且具有一正折射率，其中第二透鏡組包含有一第二彎月型透鏡。To achieve the above object, the present invention provides a projection apparatus for projecting an image onto a projection screen. The projection device includes a light valve and a non-telecentric projection lens. Light valves are used to provide images. The non-telecentric projection lens includes a plurality of spherical lenses for projecting images, and the spherical lens includes a first lens group and a second lens group. The first lens group is disposed between the light valve and the projection screen and has a negative refractive index, wherein the first lens group includes a first meniscus lens. The second lens group is disposed between the first lens group and the light valve and has a positive refractive index, wherein the second lens group includes a second meniscus lens.
本發明之非遠心投影鏡頭僅使用球面透鏡，以避免由塑膠所構成之非球面透鏡因受到溫度變化的影響所產生的脫膜或光學特性的變化，使得投影裝置受到溫度變化的影響可被降低，且在高溫度變化下維持穩定的成像。The non-telecentric projection lens of the present invention uses only a spherical lens to avoid the change of the film or optical characteristics caused by the temperature change caused by the aspherical lens made of plastic, so that the influence of the temperature change of the projection device can be reduced. And maintain stable imaging under high temperature changes.
請參考第1圖，第1圖為本發明之投影裝置之示意圖。如第1圖所示，投影裝置100包括一光閥(light valve)102以及一非遠心投影鏡頭104，且用於投射一影像106至一投影幕108上。其中，光閥102係具有複數個像素單元，以用於提供影像106，即影像106係於光閥102之位置生成，且光閥102可為一反射式顯示面板或一數位微鏡元件(digital micro-mirror device，DMD)，但不限於此。舉例來說，投影裝置100可藉由一光源與一照明透鏡將光束照射於光閥102上，且透過光閥102上之微鏡元件反射部分光束，使得所反射之光束具有影像106，但本發明並不限於此。另外，非遠心投影鏡頭104包含有複數個球面透鏡，設置於光閥102與投影幕108之間，以用於將光閥102所提供之影像106投射至投影幕108上，且具有一光軸104a，而投射在投影幕108上之投影影像110之中心與光閥102之中心分別位在光軸104a之兩側。並且，非遠心投影鏡頭104於一望遠模式時之具有一有效焦距為ft，且於一廣角模式時具有一有效焦距為fw，使得非遠心投影鏡頭104於望遠模式時之有效焦距ft與於廣角模式時之有效焦距fw之比值為非遠心投影鏡頭104之變焦倍率(zoom ratio)ft/fw。本發明之非遠心投影鏡頭104係滿足一第一關係式：ft/fw≦1.2，且較佳另滿足一第二關係式：ft/fw≧1.1。再者，非遠心投影鏡頭104具有一後焦距為bfl，且本發明之非遠心投影鏡頭104滿足一第三關係式：bfl/fw≧0.8，以及一第四關係式：18釐米(mm)≦fw≦23釐米。Please refer to FIG. 1 , which is a schematic view of a projection apparatus of the present invention. As shown in FIG. 1, the projection device 100 includes a light valve 102 and a non-telecentric projection lens 104 for projecting an image 106 onto a projection screen 108. The light valve 102 has a plurality of pixel units for providing the image 106, that is, the image 106 is generated at the position of the light valve 102, and the light valve 102 can be a reflective display panel or a digital micromirror device (digital Micro-mirror device, DMD), but is not limited to this. For example, the projection device 100 can illuminate the light beam on the light valve 102 by a light source and an illumination lens, and reflect the partial light beam through the micromirror element on the light valve 102, so that the reflected light beam has the image 106, but The invention is not limited to this. In addition, the non-telecentric projection lens 104 includes a plurality of spherical lenses disposed between the light valve 102 and the projection screen 108 for projecting the image 106 provided by the light valve 102 onto the projection screen 108 and having an optical axis. 104a, and the center of the projected image 110 projected on the projection screen 108 and the center of the light valve 102 are respectively located on both sides of the optical axis 104a. Moreover, the non-telecentric projection lens 104 has an effective focal length of ft in a telephoto mode and an effective focal length of fw in a wide-angle mode, so that the effective focal length ft and the wide angle of the non-telecentric projection lens 104 in the telephoto mode The ratio of the effective focal length fw in the mode is the zoom ratio ft/fw of the non-telecentric projection lens 104. The non-telecentric projection lens 104 of the present invention satisfies a first relationship: ft/fw ≦ 1.2, and preferably satisfies a second relationship: ft/fw ≧ 1.1. Furthermore, the non-telecentric projection lens 104 has a back focus of bfl, and the non-telecentric projection lens 104 of the present invention satisfies a third relationship: bfl/fw ≧ 0.8, and a fourth relationship: 18 cm (mm) ≦ Fw ≦ 23 cm.
以下將進一步詳細說明本發明之投影裝置的實施方式。請參考第2圖，第2圖為本發明一第一實施例之投影裝置之示意圖。如第2圖所示，非遠心投影鏡頭104包含有一光欄(aperture stop)112、一第一透鏡組114、一第二透鏡組116以及一第三透鏡組118，且光欄112設置於第一透鏡組114與第二透鏡組116之間。於本實施例中，第一透鏡組114係由一第一彎月型透鏡(meniscus lens)L11所組成，且具有一負折射率。第二透鏡組116設置於第一透鏡組114與光閥102之間，並具有一正折射率及一後焦距bfl(第二透鏡組116與光閥102之間距)，且第二透鏡組116係由一第二彎月型透鏡L12、一第一透鏡L14以及一第二透鏡L15所組成。第三透鏡組118設置於第一透鏡組114與第二透鏡組116之間，並具有一正折射率，且第三透鏡組118係由一第三彎月型透鏡L13與一第三透鏡L16所組成。並且，第一彎月型透鏡L11、第二彎月型透鏡L12、第一透鏡L14、第二透鏡L15、第三彎月型透鏡L13以及一第三透鏡L16皆為球面透鏡，因此非遠心投影透鏡104之球面透鏡之數量為6個。球面透鏡從鄰近投影幕108之一側至鄰近光閥102之一側之順序依序為第一彎月型透鏡L11、第三透鏡L16、第三彎月型透鏡L13、第一透鏡L14、第二彎月型透鏡L12以及第二透鏡L15，其中第一彎月型透鏡L11為球面透鏡中最鄰近投影幕108者，且光欄112位於第三彎月型透鏡L13與第一透鏡L14之間，而光欄112與第三彎月型透鏡L13之間距係大於光欄112與第一透鏡L14之間距，但本發明不限於此。並且，當非遠心投影鏡頭104從廣角模式向望遠模式改變時，第一透鏡組114係朝第二透鏡組116與第三透鏡組118移動，且第 二透鏡組116與第三透鏡組118之間的配置關並未改變，使第一透鏡組114與第三透鏡組118之間距縮小，且第二透鏡組116與光閥102之間距增加。本實施例之投影裝置100另包含一透明保護基板120，例如：玻璃基板，設置於光閥102與第二透鏡組116之間，用以保護光閥102。並且，本實施例之光閥102之對角線長度可為約略0.55吋(inch)，但本發明不限於此。本發明之非遠心投影鏡頭之球面透鏡數量並不限為6個，且第一透鏡組、第二透鏡組以及第三透鏡組之透鏡組合亦不限於上述。於本發明之其他實施例中，第一透鏡組除了第一彎月型透鏡之外亦可包含其他球面透鏡，第二透鏡組除了第二彎月型透鏡、第一透鏡與第二透鏡之外亦可包含其他球面透鏡，且第三透鏡組除了第三彎月型透鏡與第三透鏡之外亦可包含其他球面透鏡。Embodiments of the projection apparatus of the present invention will be described in further detail below. Please refer to FIG. 2, which is a schematic diagram of a projection apparatus according to a first embodiment of the present invention. As shown in FIG. 2, the non-telecentric projection lens 104 includes an aperture stop 112, a first lens group 114, a second lens group 116, and a third lens group 118, and the optical column 112 is disposed at A lens group 114 is interposed between the second lens group 116. In the present embodiment, the first lens group 114 is composed of a first meniscus lens L11 and has a negative refractive index. The second lens group 116 is disposed between the first lens group 114 and the light valve 102 and has a positive refractive index and a back focal length bfl (the distance between the second lens group 116 and the light valve 102), and the second lens group 116 It is composed of a second meniscus lens L12, a first lens L14 and a second lens L15. The third lens group 118 is disposed between the first lens group 114 and the second lens group 116 and has a positive refractive index, and the third lens group 118 is composed of a third meniscus lens L13 and a third lens L16. Composed of. Further, the first meniscus lens L11, the second meniscus lens L12, the first lens L14, the second lens L15, the third meniscus lens L13, and a third lens L16 are spherical lenses, and therefore are not telecentric projections. The number of spherical lenses of the lens 104 is six. The order of the spherical lens from the side adjacent to the projection screen 108 to the side adjacent to the light valve 102 is the first meniscus lens L11, the third lens L16, the third meniscus lens L13, the first lens L14, and the order The second meniscus lens L12 and the second lens L15, wherein the first meniscus lens L11 is the closest to the projection screen 108 of the spherical lens, and the light bar 112 is located between the third meniscus lens L13 and the first lens L14. The distance between the diaphragm 112 and the third meniscus lens L13 is greater than the distance between the diaphragm 112 and the first lens L14, but the invention is not limited thereto. And, when the non-telecentric projection lens 104 changes from the wide-angle mode to the telephoto mode, the first lens group 114 moves toward the second lens group 116 and the third lens group 118, and The arrangement between the second lens group 116 and the third lens group 118 is not changed, the distance between the first lens group 114 and the third lens group 118 is reduced, and the distance between the second lens group 116 and the light valve 102 is increased. The projection device 100 of the present embodiment further includes a transparent protective substrate 120, such as a glass substrate, disposed between the light valve 102 and the second lens group 116 for protecting the light valve 102. Also, the diagonal length of the light valve 102 of the present embodiment may be about 0.55 inch, but the invention is not limited thereto. The number of spherical lenses of the non-telecentric projection lens of the present invention is not limited to six, and the lens combinations of the first lens group, the second lens group, and the third lens group are not limited to the above. In other embodiments of the present invention, the first lens group may include other spherical lenses in addition to the first meniscus lens, and the second lens group is in addition to the second meniscus lens, the first lens and the second lens. Other spherical lenses may also be included, and the third lens group may include other spherical lenses in addition to the third meniscus lens and the third lens.
於本實施例中，第一彎月型透鏡L11具有面對投影幕108之一凸鏡面S11與面對光閥102之一凹鏡面S12。第三透鏡L16係為一雙凸透鏡，且具有面對投影幕108之一凸鏡面S13與面對光閥102之一凸鏡面S14。第三彎月型透鏡L13具有面對投影幕108之一凸鏡面S15以及面對光閥102之一凹鏡面S16。第一透鏡L14係為一雙凹透鏡，且具有面對投影幕108之一凹鏡面S17與面對光閥102之一凹鏡面S18。第二彎月型透鏡L12具有面對投影幕108之一凹鏡面S19與面對光閥102之一凸鏡面S110。第二透鏡L15係為一雙凸透鏡，且具有面對投影幕108之一凸鏡面S111與面對光閥102之一凸鏡面S112。透明保護基板120具有面對投影幕108之一平鏡 面S113與面對光閥102之一平鏡面S114。並且，本實施例之球面透鏡係由玻璃所構成，但不限於此，本發明之球面透鏡亦可由其他透明材料所構成，例如：塑膠。當非遠心投影鏡頭104處於廣角模式時，球面透鏡與透明保護基板120之鏡面的光學資料與配置關係列舉於表1中，但本發明並不以此為限。於表1中，「厚度」之值係代表對應此列之表面至下一列之表面之距離，即此列之鏡面與下一列之鏡面的間距。In the present embodiment, the first meniscus lens L11 has a convex mirror surface S11 facing the projection screen 108 and a concave mirror surface S12 facing the light valve 102. The third lens L16 is a lenticular lens and has a convex mirror surface S13 facing the projection screen 108 and a convex mirror surface S14 facing the light valve 102. The third meniscus lens L13 has a convex mirror surface S15 facing the projection screen 108 and a concave mirror surface S16 facing the light valve 102. The first lens L14 is a double concave lens and has a concave mirror surface S18 facing one of the projection screen 108 and a concave mirror surface S18 facing the light valve 102. The second meniscus lens L12 has a concave mirror surface S19 facing one of the projection screens 108 and a convex mirror surface S110 facing the light valve 102. The second lens L15 is a lenticular lens and has a convex mirror surface S111 facing the projection screen 108 and a convex mirror surface S112 facing the light valve 102. The transparent protective substrate 120 has a flat mirror facing the projection screen 108 The face S113 faces the flat mirror surface S114 of the light valve 102. Further, the spherical lens of the present embodiment is composed of glass, but is not limited thereto, and the spherical lens of the present invention may be composed of other transparent materials such as plastic. When the non-telecentric projection lens 104 is in the wide-angle mode, the optical data and arrangement relationship of the mirror surface of the spherical lens and the transparent protective substrate 120 are listed in Table 1, but the invention is not limited thereto. In Table 1, the value of "thickness" represents the distance from the surface of the column to the surface of the next column, that is, the distance between the mirror surface of the column and the mirror surface of the next column.
另外，當非遠心投影鏡頭104分別處於廣角模式與望遠模式時，非遠心投影鏡頭104之後焦距bfl與有效焦距係列舉於表2中，但本發明並不以此為限。由表2可知，本實施例之非遠心投影鏡頭104於廣角模式之有效焦距fw係為21.2釐米，滿足第四關係式：18≦fw≦23，且非遠心投影鏡頭104於望遠模式之有效焦距ft係為23.32釐米，因此非遠心投影鏡頭104之變焦倍率ft/fw為1.1，滿足第一關係式：ft/fw≦1.2，與第二關係式：ft/fw≧1.1。再者，非遠心投影鏡頭104於廣角模式之後焦距bfl為23.2釐米，因此非遠心投影鏡頭104滿足第三關係式：bfl/fw≧0.8。值得注意的是，本實施例之非遠心投影鏡頭104僅使用6個球面透鏡，使得投影裝置100具有輕薄短小之特性，且由於球面透鏡相較於非球面透鏡具有較低的成本，因此本實施例之投影裝置100可有效降低成本。並且，由於玻璃相較於塑膠具有較低的膨脹係數，因此由玻璃所構成之球面透鏡相較於由塑膠所構成之球面透鏡與非球面透鏡更可避免透鏡因受到溫度變化的影響所產生的脫膜或光學特性的變化，使得本實施 例之投影裝置100受到溫度變化的影響可被降低，且在高溫度變化下維持穩定的成像。另外，本實施例之非遠心投影鏡頭104僅使用球面透鏡即可具有達到1.1倍的變焦倍率、其後焦距bfl與廣角模式之有效焦距fw比值大於或等於0.8以及其廣角模式之有效焦距fw介於18釐米與23釐米之間之功效。In addition, when the non-telecentric projection lens 104 is in the wide-angle mode and the telephoto mode, respectively, the focal length bfl and the effective focal length of the non-telecentric projection lens 104 are listed in Table 2, but the invention is not limited thereto. It can be seen from Table 2 that the effective focal length fw of the non-telecentric projection lens 104 of the present embodiment in the wide-angle mode is 21.2 cm, which satisfies the fourth relation: 18≦fw≦23, and the effective focal length of the non-telecentric projection lens 104 in the telephoto mode. The ft system is 23.32 cm, so the zoom magnification ft/fw of the non-telecentric projection lens 104 is 1.1, satisfying the first relation: ft/fw ≦ 1.2, and the second relation: ft/fw ≧ 1.1. Moreover, the focal length bfl of the non-telecentric projection lens 104 after the wide-angle mode is 23.2 cm, so the non-telecentric projection lens 104 satisfies the third relation: bfl/fw ≧ 0.8. It should be noted that the non-telecentric projection lens 104 of the embodiment uses only six spherical lenses, so that the projection device 100 has the characteristics of lightness, thinness and shortness, and since the spherical lens has lower cost than the aspherical lens, the present embodiment The projection device 100 of the example can effectively reduce the cost. Moreover, since the glass phase has a lower expansion coefficient than the plastic, the spherical lens composed of glass can prevent the lens from being affected by temperature changes as compared with the spherical lens and the aspherical lens made of plastic. Stripping or changes in optical properties that make this implementation The projection device 100 of the example can be reduced in response to temperature changes and maintain stable imaging under high temperature changes. In addition, the non-telecentric projection lens 104 of the present embodiment can have a zoom magnification of 1.1 times using only a spherical lens, an effective focal length fw ratio of the back focal length bfl and the wide-angle mode is greater than or equal to 0.8, and an effective focal length fw of the wide-angle mode thereof. The effect between 18 cm and 23 cm.
此外，當非遠心投影鏡頭104從廣角模式向望遠模式改變時，第一彎月型透鏡L11係朝第三透鏡L16移動，且第三透鏡L16、第三彎月型透鏡L13、光欄112、第一透鏡L14、第二彎月型透鏡L12與第二透鏡L15之間的配置關係並未改變。並且，非遠心投影鏡頭104於廣角模式與望遠模式時之第一彎月型透鏡L11與第三透鏡L16之間距以及第二透鏡L15與光閥102之間距，即後焦距bfl，係列舉於表3中，但本發明並不以此為限。In addition, when the non-telecentric projection lens 104 changes from the wide-angle mode to the telephoto mode, the first meniscus lens L11 moves toward the third lens L16, and the third lens L16, the third meniscus lens L13, the light bar 112, The arrangement relationship between the first lens L14, the second meniscus lens L12, and the second lens L15 is not changed. Moreover, the distance between the first meniscus lens L11 and the third lens L16 in the wide-angle mode and the telephoto mode and the distance between the second lens L15 and the light valve 102, that is, the back focal length bfl, are listed in the table. 3, but the invention is not limited thereto.
本發明之投影裝置並不以上述實施例為限。下文將繼續揭示本發明之其它實施例或變化形，然為了簡化說明並突顯各實施例或變化形之間的差異，下文中使用相同標號標注相同元件，並不再對重覆部分作贅述。The projection apparatus of the present invention is not limited to the above embodiment. The other embodiments and variations of the present invention are described in the following, and the same reference numerals will be used to refer to the same elements, and the repeated parts will not be described again.
請參考第3圖，第3圖為本發明一第二實施例之投影裝置之示意圖。如第3圖所示，相較於第一實施例，本實施例之投影裝置200之非遠心投影鏡頭202的球面透鏡之數量僅為5個。並且，第一透鏡組204係由一第一彎月型透鏡L21所組成，且具有一負折射率。第二透鏡組206設置於第一透鏡組204與光閥102之間，並具有一正折射率及一後焦距bfl(第二透鏡組206與光閥102之間距)，且第二透鏡組206係由一第二彎月型透鏡L22、一第一透鏡L23以及一第二透鏡L24所構成。第三透鏡組208設置於第一透鏡組204與第二透鏡組206之間，並具有一正折射率。其中，值得一提的是，本實施例之第三透鏡組208與第一實施例之第三透鏡組118之差異在於，本實施例之第三透鏡組208並未包含有彎月型透鏡，而僅由一第三透鏡L25所構成。並且，第一彎月型透鏡L21、第二彎月型透鏡L22、第一透鏡L23、第二透鏡L24以及第三透鏡L25亦皆為球面透鏡，且光欄112設置於第一透鏡組204與第二透鏡組206之間。球面透鏡從鄰近投影幕108之一側至鄰近光閥102之一側之順序依序為第一彎月型透鏡L21、第三透鏡L25、第一透鏡L23、第二彎 月型透鏡L22以及第二透鏡L24。本發明之非遠心投影鏡頭之球面透鏡數量亦不限為上述5個，且本發明之第一透鏡組、第二透鏡組以及第三透鏡組之透鏡組合亦不限於上述，而亦可包含其他球面透鏡。Please refer to FIG. 3, which is a schematic diagram of a projection apparatus according to a second embodiment of the present invention. As shown in FIG. 3, the number of spherical lenses of the non-telecentric projection lens 202 of the projection apparatus 200 of the present embodiment is only five compared to the first embodiment. Further, the first lens group 204 is composed of a first meniscus lens L21 and has a negative refractive index. The second lens group 206 is disposed between the first lens group 204 and the light valve 102 and has a positive refractive index and a back focal length bfl (the distance between the second lens group 206 and the light valve 102), and the second lens group 206 It is composed of a second meniscus lens L22, a first lens L23 and a second lens L24. The third lens group 208 is disposed between the first lens group 204 and the second lens group 206 and has a positive refractive index. It is to be noted that the third lens group 208 of the present embodiment is different from the third lens group 118 of the first embodiment in that the third lens group 208 of the embodiment does not include a meniscus lens. It is composed only of a third lens L25. The first meniscus lens L21, the second meniscus lens L22, the first lens L23, the second lens L24, and the third lens L25 are also spherical lenses, and the light field 112 is disposed on the first lens group 204 and Between the second lens groups 206. The order of the spherical lens from the side adjacent to the projection screen 108 to the side adjacent to the light valve 102 is sequentially the first meniscus lens L21, the third lens L25, the first lens L23, and the second corner. The lunar lens L22 and the second lens L24. The number of the spherical lenses of the non-telecentric projection lens of the present invention is not limited to the above five, and the lens combinations of the first lens group, the second lens group, and the third lens group of the present invention are not limited to the above, and may also include other Spherical lens.
於本實施例中，第一彎月型透鏡L21具有面對投影幕108之一凸鏡面S21與面對光閥102之一凹鏡面S22。第三透鏡L25係為一雙凸透鏡，且具有面對投影幕108之一凸鏡面S23與面對光閥102之一凸鏡面S24。第一透鏡L23係為一雙凹透鏡，且具有面對投影幕108之一凹鏡面S25與面對光閥102之一凹鏡面S26。第二彎月型透鏡L22具有面對投影幕108之一凹鏡面S27與面對光閥102之一凸鏡面S28。第二透鏡L24係為一雙凸透鏡，且具有面對投影幕108之一凸鏡面S29與面對光閥102之一凸鏡面S210。另外，透明保護基板120具有面對投影幕108之一平鏡面S211以及面對光閥102之一平鏡面S212。當非遠心投影鏡頭202處於廣角模式時，球面透鏡與透明保護基板120之鏡面的光學資料與配置關係列舉於表4中，但本發明並不以此為限。於表4中，「厚度」之值係代表對應此列之表面至下一列之表面之距離，即此列之鏡面與下一列之鏡面的間距。In the present embodiment, the first meniscus lens L21 has a convex mirror surface S21 facing the projection screen 108 and a concave mirror surface S22 facing the light valve 102. The third lens L25 is a lenticular lens and has a convex mirror surface S23 facing the projection screen 108 and a convex mirror surface S24 facing the light valve 102. The first lens L23 is a double concave lens and has a concave mirror surface S25 facing one of the projection screens 108 and a concave mirror surface S26 facing the light valve 102. The second meniscus lens L22 has a concave mirror surface S27 facing the projection screen 108 and a convex mirror surface S28 facing the light valve 102. The second lens L24 is a lenticular lens and has a convex mirror surface S29 facing the projection screen 108 and a convex mirror surface S210 facing the light valve 102. In addition, the transparent protective substrate 120 has a flat mirror surface S211 facing the projection screen 108 and a flat mirror surface S212 facing the light valve 102. When the non-telecentric projection lens 202 is in the wide-angle mode, the optical data and arrangement relationship of the mirror surface of the spherical lens and the transparent protective substrate 120 are listed in Table 4, but the invention is not limited thereto. In Table 4, the value of "thickness" represents the distance from the surface of the column to the surface of the next column, that is, the distance between the mirror surface of the column and the mirror surface of the next column.
另外，當非遠心投影鏡頭202分別處於廣角模式與望遠模式時，非遠心投影鏡頭202之後焦距bfl與有效焦距係列舉於表5中，但本發明並不以此為限。由表5可知，本實施例之非遠心投影鏡頭202於廣角模式之有效焦距fw與於望遠模式之有效焦距ft係與第一 實施例相同，因此亦滿足第一關係式：ft/fw≦1.2，與第二關係式：ft/fw≧1.1。再者，本實施例之非遠心投影鏡頭202於廣角模式之後焦距bfl為26.288釐米，因此非遠心投影鏡頭202滿足第三關係式：bfl/fw≧0.8。值得注意的是，相較第一實施例之非遠心投影鏡頭104使用6個球面透鏡，本實施例之非遠心投影鏡頭202僅使用5個球面透鏡，因此更可有效降低透鏡成本。並且，本實施例之非遠心投影鏡頭202亦可利用玻璃所構成之球面透鏡來避免由塑膠所構成之非球面透鏡因受到溫度變化的影響所產生的脫膜或光學特性的變化，以及具有達到1.1倍的變焦倍率、其後焦距bfl與廣角模式之有效焦距fw比值大於或等於0.8以及其廣角模式之有效焦距fw介於18釐米與23釐米之間之功效。In addition, when the non-telecentric projection lens 202 is in the wide-angle mode and the telephoto mode, respectively, the focal length bfl and the effective focal length of the non-telecentric projection lens 202 are listed in Table 5, but the invention is not limited thereto. As can be seen from Table 5, the effective focal length fw of the non-telecentric projection lens 202 of the present embodiment in the wide-angle mode and the effective focal length ft of the telephoto mode are the first The embodiment is the same, and therefore also satisfies the first relation: ft/fw ≦ 1.2, and the second relation: ft/fw ≧ 1.1. Furthermore, the focal length bfl of the non-telecentric projection lens 202 of the present embodiment is 26.288 cm after the wide-angle mode, so the non-telecentric projection lens 202 satisfies the third relation: bfl/fw ≧ 0.8. It should be noted that the non-telecentric projection lens 202 of the present embodiment uses only six spherical lenses compared to the non-telecentric projection lens 104 of the first embodiment, so that the lens cost can be effectively reduced. Moreover, the non-telecentric projection lens 202 of the embodiment can also utilize a spherical lens composed of glass to avoid the change of the film or optical characteristics caused by the temperature change caused by the aspherical lens made of plastic, and The zoom magnification of 1.1 times, the effective focal length fw ratio of the back focal length bfl and the wide-angle mode is greater than or equal to 0.8, and the effective focal length fw of the wide-angle mode is between 18 cm and 23 cm.
此外，當本實施例之非遠心投影鏡頭202從廣角模式向望遠模式改變時，第一彎月型透鏡L21係朝第三透鏡L25移動，且第三透鏡L25、光欄112、第一透鏡L23、第二彎月型透鏡L22與第二透鏡L24之間的配置關係並未改變。並且，本實施例之非遠心投影鏡頭202於廣角模式與望遠模式時之第一彎月型透鏡L21與第三透鏡L25之間距以及第二透鏡L24與光閥102之間距，即後焦距bfl，係 列舉於表6中，但本發明並不以此為限。In addition, when the non-telecentric projection lens 202 of the present embodiment is changed from the wide-angle mode to the telephoto mode, the first meniscus lens L21 moves toward the third lens L25, and the third lens L25, the light bar 112, and the first lens L23 The arrangement relationship between the second meniscus lens L22 and the second lens L24 is not changed. Moreover, the distance between the first meniscus lens L21 and the third lens L25 and the distance between the second lens L24 and the light valve 102 in the wide-angle mode and the telephoto mode, that is, the back focal length bfl, in the wide-angle mode and the telephoto mode, system Listed in Table 6, but the invention is not limited thereto.
綜上所述，本發明之非遠心投影鏡頭僅使用由玻璃所構成之球面透鏡，以避免由塑膠所構成之非球面透鏡因受到溫度變化的影響所產生的脫膜或光學特性的變化，使得投影裝置受到溫度變化的影響可被降低，且在高溫度變化下維持穩定的成像。並且，本發明之非遠心投影鏡頭僅使用個位數之球面透鏡，使得投影裝置可具有輕薄短小之特性，以降低成本，且還可滿足第一、第二、第三與第四關係式。In summary, the non-telecentric projection lens of the present invention uses only a spherical lens composed of glass to avoid the change of the film or optical characteristics caused by the temperature change caused by the aspherical lens made of plastic. The projection device can be reduced by the influence of temperature changes and maintain stable imaging under high temperature changes. Moreover, the non-telecentric projection lens of the present invention uses only a single-digit spherical lens, so that the projection device can have the characteristics of lightness, thinness and shortness to reduce the cost, and can also satisfy the first, second, third and fourth relations.
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，皆應屬本發明之涵蓋範圍。The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.
100‧‧‧投影裝置100‧‧‧Projection device
102‧‧‧光閥102‧‧‧Light valve
104‧‧‧非遠心投影鏡頭104‧‧‧Non-telecentric projection lens
104a‧‧‧光軸104a‧‧‧ optical axis
106‧‧‧影像106‧‧‧Image
108‧‧‧投影幕108‧‧‧Projection screen
110‧‧‧投影影像110‧‧‧Projected imagery
112‧‧‧光欄112‧‧‧ ray
114‧‧‧第一透鏡組114‧‧‧First lens group
116‧‧‧第二透鏡組116‧‧‧second lens group
118‧‧‧第三透鏡組118‧‧‧third lens group
120‧‧‧透明保護基板120‧‧‧Transparent protective substrate
200‧‧‧投影裝置200‧‧‧Projection device
202‧‧‧非遠心投影鏡頭202‧‧‧Non-telecentric projection lens
204‧‧‧第一透鏡組204‧‧‧First lens group
206‧‧‧第二透鏡組206‧‧‧Second lens group
208‧‧‧第三透鏡組208‧‧‧third lens group
bfl‧‧‧後焦距Bfl‧‧‧back focal length
L11、L21‧‧‧第一彎月型透鏡L11, L21‧‧‧ first meniscus lens
L12、L22‧‧‧第二彎月型透鏡L12, L22‧‧‧second meniscus lens
L13‧‧‧第三彎月型透鏡L13‧‧‧3rd meniscus lens
L14、L23‧‧‧第一透鏡L14, L23‧‧‧ first lens
L15、L24‧‧‧第二透鏡L15, L24‧‧‧ second lens
L16、L25‧‧‧第三透鏡L16, L25‧‧‧ third lens
S11、S13、S14、S15、S110、S111、S112、S21、S23、S24、S28、S29、S210‧‧‧凸鏡面S11, S13, S14, S15, S110, S111, S112, S21, S23, S24, S28, S29, S210‧‧ ‧ convex mirror
S12、S16、S17、S18、S19、S22、S25、S26、S27‧‧‧凹鏡面S12, S16, S17, S18, S19, S22, S25, S26, S27‧‧‧ concave mirror
S113、S114、S211、S212‧‧‧平鏡面S113, S114, S211, S212‧‧ ‧ flat mirror
第1圖為本發明之投影裝置之示意圖。Figure 1 is a schematic view of a projection apparatus of the present invention.
第2圖為本發明一第一實施例之投影裝置之示意圖。2 is a schematic view of a projection apparatus according to a first embodiment of the present invention.
第3圖為本發明一第二實施例之投影裝置之示意圖。Figure 3 is a schematic view of a projection apparatus according to a second embodiment of the present invention.
100‧‧‧投影裝置100‧‧‧Projection device
102‧‧‧光閥102‧‧‧Light valve
104‧‧‧非遠心投影鏡頭104‧‧‧Non-telecentric projection lens
104a‧‧‧光軸104a‧‧‧ optical axis
112‧‧‧光欄112‧‧‧ ray
114‧‧‧第一透鏡組114‧‧‧First lens group
116‧‧‧第二透鏡組116‧‧‧second lens group
118‧‧‧第三透鏡組118‧‧‧third lens group
120‧‧‧透明保護基板120‧‧‧Transparent protective substrate
bfl‧‧‧後焦距Bfl‧‧‧back focal length
L11‧‧‧第一彎月型透鏡L11‧‧‧First meniscus lens
L12‧‧‧第二彎月型透鏡L12‧‧‧second meniscus lens
L13‧‧‧第三彎月型透鏡L13‧‧‧3rd meniscus lens
L14‧‧‧第一透鏡L14‧‧‧ first lens
L15‧‧‧第二透鏡L15‧‧‧second lens
L16‧‧‧第三透鏡L16‧‧‧ third lens
S11、S13、S14、S15、S110、S111、 S112‧‧‧凸鏡面S11, S13, S14, S15, S110, S111, S112‧‧‧ convex mirror
S12、S16、S17、S18、S19‧‧‧凹鏡面S12, S16, S17, S18, S19‧‧‧ concave mirror
S113、S114‧‧‧平鏡面S113, S114‧‧ ‧ flat mirror
Claims (11)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW101135321A TWI467311B (en) | 2012-09-26 | 2012-09-26 | Projection apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW101135321A TWI467311B (en) | 2012-09-26 | 2012-09-26 | Projection apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| TW201413364A TW201413364A (en) | 2014-04-01 |
| TWI467311B true TWI467311B (en) | 2015-01-01 |
Family
ID=52784734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| TW101135321A TWI467311B (en) | 2012-09-26 | 2012-09-26 | Projection apparatus |
Country Status (1)
| Country | Link |
|---|---|
| TW (1) | TWI467311B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5313330A (en) * | 1992-08-31 | 1994-05-17 | U.S. Precision Lens Incorporated | Zoom projection lens systems |
| JP2004126280A (en) * | 2002-10-03 | 2004-04-22 | Tamron Co Ltd | Projection lens |
| US20090153986A1 (en) * | 2007-12-14 | 2009-06-18 | Qisda Corporation | Wide-angle lens and projection device using the same |
| TW201205144A (en) * | 2010-07-29 | 2012-02-01 | Young Optics Inc | Projection lens |
-
2012
- 2012-09-26 TW TW101135321A patent/TWI467311B/en not_active IP Right Cessation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5313330A (en) * | 1992-08-31 | 1994-05-17 | U.S. Precision Lens Incorporated | Zoom projection lens systems |
| JP2004126280A (en) * | 2002-10-03 | 2004-04-22 | Tamron Co Ltd | Projection lens |
| US20090153986A1 (en) * | 2007-12-14 | 2009-06-18 | Qisda Corporation | Wide-angle lens and projection device using the same |
| TW201205144A (en) * | 2010-07-29 | 2012-02-01 | Young Optics Inc | Projection lens |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201413364A (en) | 2014-04-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MM4A | Annulment or lapse of patent due to non-payment of fees |