TWI680342B - Projector and its projection lens - Google Patents
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Abstract
一種投影機與投影鏡頭,該投影機包括有一影像光源產生裝置以及該投影鏡頭,該影像光源產生裝置用以產生影像光束,該投影鏡頭包括有一中繼光學系統,用以接收該影像光束;以及一投影光學系統,包括有至少一透鏡以及一反射件;當該中繼光學系統接收該影像光束時,該影像光束係通過該至少一透鏡,並經由該反射件反射後,再度通過該至少一透鏡,並投射至該成像面;其中,該反射件的最大鏡徑與該中繼光學系統中最大鏡徑之一該透鏡的鏡徑的比值為X,其滿足以下條件:1.5≦X≦4。 A projector and a projection lens. The projector includes an image light source generating device and a projection lens. The image light source generating device is configured to generate an image beam. The projection lens includes a relay optical system to receive the image beam. A projection optical system includes at least one lens and a reflecting member. When the relay optical system receives the image beam, the image beam passes through the at least one lens, is reflected by the reflecting member, and passes through the at least one again. Lens, and projected onto the imaging surface; wherein the ratio of the maximum mirror diameter of the reflector to the mirror diameter of the lens is one of the largest mirror diameters in the relay optical system, which satisfies the following conditions: 1.5 ≦ X ≦ 4 .
Description
本發明係與光學投影裝置有關;特別是指一種降低鬼影形成的投影機及其投影鏡頭。 The invention relates to an optical projection device; in particular, it relates to a projector and a projection lens for reducing the formation of ghost images.
隨著視訊技術的進步、光電科技的快速發展,如投影機之投影顯示裝置越來越普及,其除了可應用於工作場合中的會議之外,還可應用於如家庭娛樂之家庭劇院的放映,而其用以將影像清晰地呈現在成像面上之投影鏡頭更是核心元件之一。 With the advancement of video technology and the rapid development of optoelectronic technology, projection display devices such as projectors are becoming more and more popular. In addition to being used in conferences in the workplace, they can also be used in home theaters such as home entertainment The projection lens used to clearly present the image on the imaging surface is one of the core components.
為能在小空間也能達到清晰投影之效果,投影機的投影鏡頭逐漸往短焦投影鏡頭之方向進行設計,但為使短距離也能具有良好投射效果,短焦鏡頭通常會使用數量較多且體積較大的透鏡來達到短焦同時又高光學功率之效果。 In order to achieve clear projection in a small space, the projection lens of the projector is gradually designed toward the short-focus projection lens. However, in order to have a good projection effect at short distances, short-focus lenses are usually used in large numbers. And the larger lens achieves the effect of short focus and high optical power.
惟習用的投影機與投影鏡頭,不但體積龐大且重量重,無法符合小型化與輕量化之要求,為改善上述缺點,遂有業者研發一種背投式投影機,即是在內部利用反射鏡將投影機之影像光束反射以投射至成像面上,以求達到小型化與輕量化之目的。然而,習用的背投式投影機於投影時,其鏡片組之間時常會出現多次的反射而產生光環、光斑等,例如在反射鏡與透鏡之間,透鏡與透鏡之間容易產生多次的反射,以至於在其投影畫面上常會出現有位置、形狀不定之重疊影、鬼影等缺 陷,不僅有礙其投影畫面的美觀,更破壞了其投影畫面之構圖,造成使用者的困擾。 However, conventional projectors and projection lenses are not only bulky and heavy, and they cannot meet the requirements of miniaturization and light weight. In order to improve the above disadvantages, some researchers have developed a rear-projection projector, which uses a mirror to The image beam of the projector is reflected and projected onto the imaging surface to achieve the purpose of miniaturization and light weight. However, when a conventional rear-projection projector is used for projection, there are often multiple reflections between the lens groups to generate haloes and flare. For example, between the mirror and the lens, it is easy to generate multiple times between the lens and the lens. Reflections, so that on their projection screens, there are often defects such as overlapping shadows and ghosting shadows of varying positions and shapes. Depression not only hinders the beauty of the projection screen, but also destroys the composition of the projection screen, causing user distress.
是以,如何降低或消除所出現的鬼影(ghost image)等瑕疵的產生,以提供高品質的投影畫面,是發明人所努力的方向之一。 Therefore, how to reduce or eliminate the occurrence of defects such as ghost images to provide a high-quality projection screen is one of the efforts of the inventors.
有鑑於此,本發明之目的在於提供一種可有效改善鬼影問題的投影機及其投影鏡頭。 In view of this, an object of the present invention is to provide a projector and a projection lens thereof which can effectively improve the ghost problem.
緣以達成上述目的,本發明提供的一種投影機,其包括有:一影像光源產生裝置,用以產生一影像光束;一投影鏡頭,用以接收該影像光束並投射至一成像面,該投影鏡頭包括一中繼光學系統以及一投影光學系統;該中繼光學系統位於該影像光源產生裝置以及該投影光學系統之間,用以接收該影像光束;該投影光學系統包括有一第一透鏡以及一第二透鏡,該第一透鏡具有相背對的一第一光學面以及一第二光學面,該第一光學面上設有一反射膜;該第二透鏡位於該第一透鏡以及該中繼光學系統之間,且該第二透鏡具有相背對的一第三光學面以及一第四光學面,該第四光學面面對該中繼光學系統;其中,當該中繼光學系統接收該影像光束後,該影像光束係自該第四光學面射入該第二透鏡,並由該第三光學面離開該第二透鏡,再由第二光學面射入該第一透鏡,並經由該反射膜反射後,自該第二光學面離開該第一透鏡,再由第三光學面射入該第二透鏡,再由該第四光學面離開該第二透鏡後,投射至該成像面。 In order to achieve the above object, a projector provided by the present invention includes: an image light source generating device for generating an image light beam; a projection lens for receiving the image light beam and projecting it to an imaging surface, the projection The lens includes a relay optical system and a projection optical system; the relay optical system is located between the image light source generating device and the projection optical system to receive the image light beam; the projection optical system includes a first lens and a A second lens having a first optical surface and a second optical surface opposite to each other, a reflective film is disposed on the first optical surface; the second lens is located on the first lens and the relay optics Between the systems, and the second lens has a third optical surface and a fourth optical surface opposite to each other, the fourth optical surface faces the relay optical system; wherein when the relay optical system receives the image After the light beam, the image light beam enters the second lens from the fourth optical surface, leaves the second lens from the third optical surface, and then enters the first optical surface from the second optical surface. Mirror, reflected by the reflective film, leaves the first lens from the second optical surface, enters the second lens from the third optical surface, and exits the second lens from the fourth optical surface, and then projects To the imaging surface.
緣以達成上述目的,本發明另提供一種投影鏡頭,用以接收一影像光束並投射至一成像面,其包括有:一中繼光學系統,用以接 收該影像光束;一投影光學系統,包括有一第一透鏡以及一第二透鏡,該第一透鏡具有相背對的一第一光學面以及一第二光學面,該第一光學面上設有一反射膜;該第二透鏡位於該第一透鏡以及該中繼光學系統之間,且該第二透鏡具有相背對的一第三光學面以及一第四光學面,該第四光學面面對該中繼光學系統;其中,當該中繼光學系統接收該影像光束後,該影像光束係自該第四光學面射入該第二透鏡,並由該第三光學面離開該第二透鏡,再由第二光學面射入該第一透鏡,並經由該反射膜反射後,自該第二光學面離開該第一透鏡,再由第三光學面射入該第二透鏡,再由該第四光學面離開該第二透鏡後,投射至該成像面。 In order to achieve the above object, the present invention further provides a projection lens for receiving an image beam and projecting the image beam onto an imaging surface, which includes: a relay optical system for receiving Receiving the image beam; a projection optical system including a first lens and a second lens, the first lens having a first optical surface and a second optical surface opposite to each other, and a first optical surface is provided with a A reflective film; the second lens is located between the first lens and the relay optical system, and the second lens has a third optical surface and a fourth optical surface opposite to each other, and the fourth optical surface faces The relay optical system; wherein, after the relay optical system receives the image beam, the image beam enters the second lens from the fourth optical surface and leaves the second lens from the third optical surface, The second optical surface is incident on the first lens and reflected by the reflective film, and then leaves the first lens from the second optical surface, and then enters the second lens from the third optical surface, and is then transmitted by the first optical surface. After the four optical surfaces leave the second lens, they are projected onto the imaging surface.
本發明之效果在於,該影像光束穿透該第二透鏡後,係自第一透鏡的第二光學面射入,並經由該反射膜反射再次由第一透鏡的第二光學面射出,並再次穿透該第二透鏡後,投射至成像面上。藉此,可使得影像光束重複通過投影光學系統,達到二次光學效果之光學設計,從而可有效縮小投影機、投影鏡頭的體積,並兼具有高光學校能。此外,該影像光束並不穿透該第一透鏡的第一光學面,而是經由該第一光學面上的反射膜反射後,自該第一透鏡的第二光學面離開並再度穿透該第二透鏡,透過上述設計,可降低影像光束在鏡片間產生不必要之多次反射的機會,從而可降低鬼影的產生,提升投影畫面的品質。 The effect of the present invention is that after the image light beam penetrates the second lens, it is incident from the second optical surface of the first lens, and is reflected again by the reflective film, and is emitted again from the second optical surface of the first lens, and again After passing through the second lens, it is projected onto the imaging surface. In this way, the image beam can be repeatedly passed through the projection optical system to achieve the optical design of the secondary optical effect, which can effectively reduce the size of the projector and the projection lens, and also has the ability of high-light school. In addition, the image beam does not penetrate the first optical surface of the first lens, but is reflected by a reflective film on the first optical surface, exits from the second optical surface of the first lens, and passes through the first optical surface again. Through the above design, the second lens can reduce the chance of unnecessary multiple reflections of the image beam between the lenses, thereby reducing the occurrence of ghost images and improving the quality of the projected picture.
100‧‧‧投影機 100‧‧‧ Projector
10‧‧‧影像光源產生裝置 10‧‧‧Image light source generating device
20‧‧‧投影鏡頭 20‧‧‧ projection lens
22‧‧‧中繼光學系統 22‧‧‧ Relay Optical System
24‧‧‧投影光學系統 24‧‧‧ Projection Optical System
A‧‧‧光軸 A‧‧‧ Optical axis
B1,B1’‧‧‧第一遮光件 B1, B1’‧‧‧first shade
B2‧‧‧第二遮光件 B2‧‧‧Second shade
D‧‧‧距離 D‧‧‧distance
F‧‧‧稜鏡 F‧‧‧ 稜鏡
G‧‧‧透鏡 G‧‧‧ lens
L1‧‧‧第一透鏡 L1‧‧‧First lens
L2‧‧‧第二透鏡 L2‧‧‧Second lens
L3‧‧‧第三透鏡 L3‧‧‧ Third lens
L4~L12‧‧‧透鏡 L4 ~ L12‧‧‧ lens
P‧‧‧影像光束 P‧‧‧Image Beam
R1‧‧‧反射件 R1‧‧‧Reflector
R2‧‧‧反射膜 R2‧‧‧Reflective film
ST‧‧‧光圈 ST‧‧‧ aperture
S1‧‧‧第一光學面 S1‧‧‧First optical surface
S2‧‧‧第二光學面 S2‧‧‧Second optical surface
S3‧‧‧第三光學面 S3‧‧‧ third optical surface
S4‧‧‧第四光學面 S4‧‧‧ Fourth optical surface
200,300,400,500,600,700‧‧‧投影鏡頭 200, 300, 400, 500, 600, 700 ‧‧‧ projection lens
圖1為本發明一第一實施例之投影機的架構圖。 FIG. 1 is a structural diagram of a projector according to a first embodiment of the present invention.
圖2為上述實施例之投影鏡頭的架構圖。 FIG. 2 is a structural diagram of the projection lens of the above embodiment.
圖3為圖2的局部放大圖,揭露於一實施例中,設置有一第一遮光件。 FIG. 3 is a partially enlarged view of FIG. 2, and it is disclosed in an embodiment that a first light shielding member is provided.
圖4為圖2的局部放大圖,揭露於一實施例中,設置有一第二遮光件。 FIG. 4 is a partially enlarged view of FIG. 2, and it is disclosed in an embodiment that a second light shielding member is provided.
圖5為一第二實施例之投影鏡頭的架構圖。 FIG. 5 is a structural diagram of a projection lens according to a second embodiment.
圖6為一第三實施例之投影鏡頭的架構圖。 FIG. 6 is a structural diagram of a projection lens according to a third embodiment.
圖7為一第四實施例之投影鏡頭的架構圖。 FIG. 7 is a structural diagram of a projection lens according to a fourth embodiment.
圖8為一第五實施例之投影鏡頭的架構圖。 FIG. 8 is a structural diagram of a projection lens according to a fifth embodiment.
圖9為一第六實施例之投影鏡頭的架構圖。 FIG. 9 is a structural diagram of a projection lens according to a sixth embodiment.
圖10為一第七實施例之投影鏡頭的架構圖。 FIG. 10 is a structural diagram of a projection lens according to a seventh embodiment.
為能更清楚地說明本發明,茲舉一實施例並配合圖式詳細說明如後。請參圖1及圖2所示,為本發明一實施例之投影機100,其包括有一影像光源產生裝置10以及一投影鏡頭20。 In order to explain the present invention more clearly, an embodiment is described in detail below with reference to the drawings. Please refer to FIG. 1 and FIG. 2, a projector 100 according to an embodiment of the present invention includes an image light source generating device 10 and a projection lens 20.
該影像光源產生裝置10用以讀取一影像來源之影像資訊,且具有1片稜鏡F,並依據讀取的影像資訊產生對應之一通過該稜鏡F的影像光束P。該投影鏡頭20用以接收該影像光束P且經過預定效果之光學處理後投射至一成像面,例如可將影像光束P投射至一投影幕(projection screen)上,以在投影幕(相當於成像面)上形成一投影畫面。另外,於其他實際實施上,依據不同光學系統的應用,並不以設置有該稜鏡F為限,舉例而言,於一實施例中,所述的影像光源產生裝置10亦可不設置有稜鏡,而依據所讀取的影像資訊產生一影像光束P後直接射向投影鏡頭,而不以上述說明為限。 The image light source generating device 10 is used for reading image information of an image source, and has one piece of 稜鏡 F, and generates a corresponding image beam P passing through the 稜鏡 F according to the read image information. The projection lens 20 is used to receive the image beam P and project it to an imaging surface after optical processing with a predetermined effect. For example, the image beam P can be projected onto a projection screen to project the image on the projection screen (equivalent to imaging). Surface) to form a projection screen. In addition, in other practical implementations, depending on the application of different optical systems, the 稜鏡 F is not limited. For example, in an embodiment, the image light source generating device 10 may not be provided with a rib. Mirror, and generates an image beam P according to the read image information, and directly shoots the projection beam P, without being limited to the above description.
該投影鏡頭20包括有自接近該影像光源產生裝置10一側至遠離影像光源產生裝置10一側依序排列的一中繼光學系統22以及一投影光學系統24。 The projection lens 20 includes a relay optical system 22 and a projection optical system 24 arranged in order from a side near the image light source generating device 10 to a side far from the image light source generating device 10.
該中繼光學系統22主要由多個透鏡所組成,例如在本實施例中,該中繼光學系統22包括有10片透鏡,包括第三透鏡L3以及其他透鏡L4~L12,其中,第三透鏡L3以及透鏡L3~L5、L7、L10~L12為單層透鏡,透鏡L6、L8、L9為複合透鏡,所述的複合透鏡可由兩片或兩片以上之透鏡膠合而成,但不以此為限,另外,於一實施例中,在透鏡L7與透鏡L8之間可設置有一光圈ST。該中繼光學系統22用以接收該影像光束P,並依據所設計之光學效果傳導該影像光束P,例如可設計有如校正或補償其本身或所引入之色差或是如球差、彗差、像散、場曲、畸變等像差,或是進行光線路徑調整,如進行調焦、變焦等的光學設計等,但不以此為限。此外,於其他應用上,亦可根據不同的光學設計或特性的要求,對中繼光學系統22的透鏡數、鏡片形狀等透鏡參數與架構進行調整或改變。 The relay optical system 22 is mainly composed of a plurality of lenses. For example, in this embodiment, the relay optical system 22 includes 10 lenses, including a third lens L3 and other lenses L4 to L12. Among them, the third lens L3 and lenses L3 ~ L5, L7, L10 ~ L12 are single-layer lenses, and lenses L6, L8, and L9 are compound lenses. The compound lenses can be cemented by two or more lenses, but this is not the case. In addition, in an embodiment, an aperture ST may be provided between the lens L7 and the lens L8. The relay optical system 22 is used to receive the image light beam P and conduct the image light beam P according to the designed optical effect. Astigmatism, field curvature, distortion and other aberrations, or adjustment of light path, such as optical design for focusing, zooming, etc., but not limited to this. In addition, in other applications, lens parameters and architectures such as the number of lenses and lens shape of the relay optical system 22 can also be adjusted or changed according to different optical design or characteristic requirements.
該投影光學系統24主要包括有至少一透鏡G以及一反射件R1。於本實施例當中,該至少一透鏡G包括有一第一透鏡L1以及一第二透鏡L2,該第一透鏡L1具有一第一光學面S1以及一第二光學面S2,該第二透鏡L2位於該第一透鏡L1以及該中繼光學系統22之間,且該第二透鏡L2具有相背對的一第三光學面S3以及一第四光學面S4,該第四光學面S4面對該中繼光學系統22。於本實施例中,該第一透鏡L1與該第二透鏡L2皆為彎月形透鏡,該第一透鏡L1的該第一光學面S1為凸面,該第二光學面S2為凹面,該第二透鏡L2的該第三光學面S3為凹面,該第四光學面S4為凸面,該第三光學面S3與該第二光學面S2相面對。該反射件R1 於本實施例中為一反射鏡,設置於該第一透鏡L1之第一光學面S1的一側。 The projection optical system 24 includes at least one lens G and a reflector R1. In this embodiment, the at least one lens G includes a first lens L1 and a second lens L2. The first lens L1 has a first optical surface S1 and a second optical surface S2. The second lens L2 is located at Between the first lens L1 and the relay optical system 22, and the second lens L2 has a third optical surface S3 and a fourth optical surface S4 facing away from each other, and the fourth optical surface S4 faces the middle Following the optical system 22. In this embodiment, the first lens L1 and the second lens L2 are both meniscus lenses, the first optical surface S1 of the first lens L1 is convex, the second optical surface S2 is concave, and the first The third optical surface S3 of the two lenses L2 is a concave surface, the fourth optical surface S4 is a convex surface, and the third optical surface S3 faces the second optical surface S2. The reflector R1 In this embodiment, a reflector is disposed on one side of the first optical surface S1 of the first lens L1.
於本實施例中,所述投影鏡頭100係滿足以下條件:1.5≦X≦4,其中,前述X為該反射件R1的最大鏡徑與該中繼光學系統22中最大鏡徑之一該透鏡的鏡徑的比值,例如,於本實施例中,所述反射件R1的最大鏡徑係指反射鏡的鏡徑,其鏡徑為52mm;該中繼光學系統22中最大鏡徑之透鏡為第三透鏡L3,其鏡徑為27.8mm,計算其X約為1.87,滿足前述條件。較佳者,所述投影鏡頭100係滿足以下條件:1.8≦X≦3.5,透過前述設計,本發明之投影機100可以在有效地縮減投影鏡頭20之系統長度、大小與體積的情況下,實現出光角度大之效果,並可據以設計出短焦、小型化的投影鏡頭與投影機。 In this embodiment, the projection lens 100 satisfies the following conditions: 1.5 ≦ X ≦ 4, where X is one of the maximum lens diameter of the reflector R1 and the maximum lens diameter of the relay optical system 22 For example, in this embodiment, the maximum mirror diameter of the reflector R1 refers to the mirror diameter of the mirror, and its mirror diameter is 52 mm; the lens with the largest mirror diameter in the relay optical system 22 is The third lens L3 has a lens diameter of 27.8 mm, and its calculated X is about 1.87, which satisfies the foregoing conditions. Preferably, the projection lens 100 satisfies the following conditions: 1.8 ≦ X ≦ 3.5. Through the foregoing design, the projector 100 of the present invention can be implemented while effectively reducing the system length, size, and volume of the projection lens 20. The effect of large light angle can be used to design short-focus, miniaturized projection lenses and projectors.
另外,較佳者,所述投影鏡頭100還滿足以下條件:0.5≦Y≦4,其中,前述Y為該投影光學系統24中最大鏡徑之透鏡的鏡徑與該中繼光學系統22中最大鏡徑之透鏡的鏡徑的比值,例如,於本實施例當中,所述投影光學系統24中最大鏡徑之透鏡為第二透鏡L2,其鏡徑為53.4mm;所述中繼光學系統22最大鏡徑之透鏡為第三透鏡L3,其鏡徑為27.8mm,計算其Y約為1.92,滿足以上條件。較佳者,於一實施例當中,所述投影鏡頭係滿足以下條件:1.0≦Y≦3.5,透過上述設計,本發明之投影機100可以更進一步地在有效地縮減投影鏡頭20之系統長度、大小與體積的情況下,實現出光角度大之效果,並可據以設計出短焦、小型化的投影鏡頭與投影機。 In addition, preferably, the projection lens 100 also satisfies the following conditions: 0.5 ≦ Y ≦ 4, where Y is the largest lens diameter of the lens in the projection optical system 24 and the largest lens diameter in the relay optical system 22 The ratio of the lens diameter of the lens diameter. For example, in this embodiment, the lens with the largest lens diameter in the projection optical system 24 is the second lens L2, whose lens diameter is 53.4mm; the relay optical system 22 The lens with the largest mirror diameter is the third lens L3, whose mirror diameter is 27.8 mm, and its Y is calculated to be about 1.92, which satisfies the above conditions. Preferably, in an embodiment, the projection lens satisfies the following conditions: 1.0 ≦ Y ≦ 3.5. Through the above design, the projector 100 of the present invention can further effectively reduce the system length of the projection lens 20, In the case of size and volume, the effect of large light angle can be achieved, and short-focus, miniaturized projection lenses and projectors can be designed accordingly.
藉此,請配合圖1及圖2所示,當該影像光源產生裝置10產生影像光束P時,該影像光束P進入該投影鏡頭20時,係先通過該中繼光學系統22,並自第四光學面S4射入該第二透鏡L2,並由該第三光學面 S3離開該第二透鏡L2,再由第二光學面S2射入該第一透鏡L1,並且經由該反射件R1反射後,自該第一透鏡L1的第二光學面S2離開該第一透鏡L1,再由該第三光學面S3射入該第二透鏡L2,再由該第四光學面S4離開該第二透鏡L2後,投射至成像面(圖未示),例如投射至一投影幕,以形成投影畫面。 Therefore, please cooperate with FIG. 1 and FIG. 2, when the image light source generating device 10 generates an image beam P, when the image beam P enters the projection lens 20, it first passes through the relay optical system 22, Four optical surfaces S4 enter the second lens L2 and pass through the third optical surface. S3 leaves the second lens L2, enters the first lens L1 through the second optical surface S2, and reflects through the reflector R1, and then leaves the first lens L1 from the second optical surface S2 of the first lens L1. Then, the third optical surface S3 enters the second lens L2, and the fourth optical surface S4 leaves the second lens L2, and then is projected onto the imaging surface (not shown), for example, onto a projection screen, To form a projection screen.
透過上述設計,影像光束P係重複通過該第二透鏡L2以及該第一透鏡L1而可達到二次光學效果,並且,透過前述中繼光學系統22以及投影光學系統24之鏡片的搭配與參數條件的設計,本發明的投影機與投影鏡頭可以在縮小鏡片的大小與體積的情況下,仍可有有效地達到高光學效能的設計,並可達到短焦以及小型化的效果。 Through the above design, the image beam P is repeatedly passed through the second lens L2 and the first lens L1 to achieve a secondary optical effect, and through the above-mentioned relay lens system 22 and projection lens system 24, the lens matching and parameter conditions The design of the projector and the projection lens of the present invention can effectively achieve a high optical efficiency design while reducing the size and volume of the lens, and can achieve the effects of short focus and miniaturization.
另外,藉由本實施例之投影鏡頭的設計,該影像光束P是由第二透鏡L2的下半部入射至該投影光學系統24中,於後,再由第二透鏡L2的上半部離開該投影光學系統24而投射至成像面,如此一來,經反射件R1反射前的光學路徑與經反射件R1反射後的光學路徑部互相交錯,而可有效避免光學干涉,以提升投影成像品質。 In addition, with the design of the projection lens of this embodiment, the image light beam P is incident into the projection optical system 24 from the lower half of the second lens L2, and then exits from the upper half of the second lens L2. The projection optical system 24 projects to the imaging surface. In this way, the optical path before the reflection by the reflector R1 and the optical path after the reflection by the reflector R1 intersect with each other, which can effectively avoid optical interference and improve the projection imaging quality.
另外,請配合圖3所示,於一實施例中,基於本說明書任一投影鏡頭的架構下,還包括有一第一遮光件B1設置於該反射件R1與該投影光學系統24的該至少一透鏡之間,例如,在本實施例中,所述的第一遮光件B1係設置於該反射件R1與該第一透鏡L1之間,用以遮蔽、阻擋或吸收射向第一遮光件B1的光線,較佳者,所述第一遮光件B1係由不透光的材質製成,其中,該第一遮光件B1的用途在於,當影像光束射向第一遮光件B1時,不論是自第一透鏡L1側射向第一遮光件B1的影像光束,或者經反射件R1反射後射向第一遮光件B1的影像光束,均可藉由第一遮光件B1遮蔽之。另外,除了可在第一透鏡L1與反射件R1設置有第 一遮光件B1之外,於一實施例中,亦可在第一透鏡L1與第二透鏡L2之間設置有一第一遮光件B1,,藉以遮擋掉不必要之光線,例如雜散光等。 In addition, please cooperate with FIG. 3. In one embodiment, based on the structure of any projection lens in this specification, a first light shielding member B1 is further provided on the at least one of the reflecting member R1 and the projection optical system 24. Between the lenses, for example, in this embodiment, the first light-shielding member B1 is disposed between the reflection member R1 and the first lens L1 to shield, block, or absorb the first light-shielding member B1. Preferably, the first light-shielding member B1 is made of an opaque material. The purpose of the first light-shielding member B1 is that when the image light beam is directed to the first light-shielding member B1, whether it is The image light beam emitted from the side of the first lens L1 toward the first light shielding member B1, or the image light beam reflected by the reflection member R1 and directed toward the first light shielding member B1 can be shielded by the first light shielding member B1. In addition, in addition to the first lens L1 and the reflector R1, In addition to a light-shielding member B1, in an embodiment, a first light-shielding member B1 may also be disposed between the first lens L1 and the second lens L2, so as to block unnecessary light, such as stray light.
另外,於一實施例當中,該第一透鏡L1係依光軸A劃分有一第一半部(以圖3視角來看又可稱為上半部)以及一第二半部(以圖3視角來看又可稱為下半部),其中,該第二半部主要供影像光束通過,換言之,大多數的影像光束係經由第一透鏡L1的第二半部通過第一透鏡L1,而在第一半部與反射件R1之間係設置有該第一遮光件B1。亦即,較佳者,所述第一遮光件B1的延伸範圍係由光軸A延伸至反射件R1與第一透鏡L1的邊緣,或者稱之為第一遮光件B1係設置於該光軸A的一側,或者設置於光軸A以上的區域,另外,於一些實施例當中,可視需求設定第一遮光件B1的遮蔽範圍。另外一提的是,於一些實施例當中,所述第一遮光件B1可少部分地延伸到光軸A以下,不過較佳者,第一遮光件B1位於光軸A以上的部分將顯著多於光軸A以下的部分。其中,前述所稱光軸A以上與以下的判定,係以圖3的視角說明之,於其他應用上,所述的以上與以下,亦可能根據投影機擺設的方式不同而有所變更。 In addition, in an embodiment, the first lens L1 is divided into a first half (also referred to as the upper half in the perspective of FIG. 3) and a second half (in the perspective of FIG. 3) according to the optical axis A. It can also be referred to as the lower half), in which the second half mainly passes the image light beam, in other words, most of the image light beam passes through the first lens L1 through the second half of the first lens L1, and The first light shielding member B1 is disposed between the first half portion and the reflection member R1. That is, preferably, the extension range of the first light-shielding member B1 is extended from the optical axis A to the edge of the reflector R1 and the first lens L1, or the first light-shielding member B1 is provided on the optical axis. One side of A may be disposed in a region above the optical axis A. In addition, in some embodiments, a shielding range of the first light shielding member B1 may be set according to requirements. It is also mentioned that, in some embodiments, the first light-shielding member B1 may extend to a portion below the optical axis A, but it is better that the portion of the first light-shielding member B1 above the optical axis A will be significantly more Below the optical axis A. Among them, the above-mentioned determination of the above-mentioned optical axis A and below is explained from the perspective of FIG. 3. In other applications, the above-mentioned and below may also be changed according to the way the projector is arranged.
藉此,透過上述第一遮光件B1的設計,可有效地消除雜散光線,預防鬼影等瑕疵的產生,從而可有助於提升光學成像品質。 Therefore, through the design of the first light-shielding member B1, stray light can be effectively eliminated, and defects such as ghosting can be prevented, thereby helping to improve optical imaging quality.
另外,請配合圖4所示,於一實施例中,亦可在第一透鏡L1與第二透鏡L2之間設置有一第二遮光件B2,該第二遮光件B2的材質與特性上的選用與第一遮光件B1大致相同,於此不再贅述。另外,較佳者,所述第二遮光件B2係相對靠近第二透鏡L2,且相對遠離第一透鏡L1。更進一步地,更佳者,所述第二遮光件B2係相對靠近第二透鏡L2的中央,且相對遠離第二透鏡L2的邊緣或外徑部分。 In addition, as shown in FIG. 4, in an embodiment, a second light shielding member B2 may be provided between the first lens L1 and the second lens L2. The material and characteristics of the second light shielding member B2 may be selected. It is substantially the same as the first light shielding member B1, and is not repeated here. In addition, preferably, the second light shielding member B2 is relatively close to the second lens L2 and relatively far from the first lens L1. Furthermore, more preferably, the second light-shielding member B2 is relatively close to the center of the second lens L2 and relatively far from the edge or outer diameter portion of the second lens L2.
藉此,透過上述第二遮光件B2的設計,可進一步有效地消除雜散光線,預防鬼影等瑕疵的產生,從而可有助於提升光學成像品質。 Therefore, through the design of the second light-shielding member B2, stray light can be further effectively eliminated, and defects such as ghosting can be prevented, thereby helping to improve optical imaging quality.
請參圖5所示,為本發明一第二實施例的投影鏡頭200,其架構與前述第一實施例的投影鏡頭100大致相同,其中,其反射件R1的鏡徑為53.14mm,其中繼光學系統當中最大鏡徑的透鏡係為透鏡L12,其透鏡L12的鏡徑為24mm,經計算其X=2.21416,其除滿足1.5≦X≦4之條件之外,特別的是,更滿足以下條件:0.5≦≦4,其中,D為該投影光學系統與該中繼光學系統之間的距離,M為該中繼光學系統中最大鏡徑之透鏡的鏡徑,舉例而言,於一實施例當中,所述投影光學系統與中繼光學系統之間的距離D係指第二透鏡L2與第三透鏡L3於光軸A上的距離,而中繼光學系統當中最大鏡徑的透鏡係為透鏡L12,該距離D為50.5mm,透鏡L12的鏡徑為24mm,經計算其=2.1,滿足前述條件。較佳者,所述投影鏡頭200係滿足以下條件,0.7≦≦3.5。透過前述設計,本發明之投影機可以在有效地縮減投影鏡頭之系統長度、大小與體積的情況下,實現出光角度大之效果,並可據以設計出短焦、小型化的投影鏡頭與投影機。 Please refer to FIG. 5, which is a projection lens 200 according to a second embodiment of the present invention. The structure of the projection lens 200 is substantially the same as the projection lens 100 of the first embodiment. The reflector R1 has a mirror diameter of 53.14 mm. The largest lens diameter in the optical system is the lens L12. The lens diameter of the lens L12 is 24mm. After calculation, X = 2.21416. In addition to satisfying the condition of 1.5 ≦ X ≦ 4, in particular, the following conditions are more satisfied. : 0.5 ≦ ≦ 4, where D is the distance between the projection optical system and the relay optical system, and M is the mirror diameter of the lens with the largest mirror diameter in the relay optical system. For example, in one embodiment, all The distance D between the projection optical system and the relay optical system refers to the distance between the second lens L2 and the third lens L3 on the optical axis A, and the lens with the largest lens diameter in the relay optical system is the lens L12. The distance D is 50.5mm, and the lens diameter of the lens L12 is 24mm. = 2.1, meeting the aforementioned conditions. Preferably, the projection lens 200 meets the following conditions, 0.7 ≦ ≦ 3.5. Through the aforementioned design, the projector of the present invention can effectively reduce the system length, size, and volume of the projection lens to achieve a large light angle, and can be used to design short-focus, miniaturized projection lenses and projections. machine.
請參圖6所示,為本發明一第三實施例的投影鏡頭300,其架構與前述實施例的投影鏡頭大致上相同,特別的是,本實施例之投影光學系統的反射件係以設置於第一透鏡L1之第一光學面S1的反射膜R2為例,其中,所述反射膜R2可以是由在第一透鏡L1之第一光學面S1上鍍上如銀或鋁等金屬膜所構成,但並不以此為限,於其他應用上,亦可採用其他材質的反射膜,舉例而言,亦可使用介電質膜以構成該反射膜,例如使用陶瓷介電質鍍膜(Dielectric Coating),而不以上述的金屬膜為限。其中,於第三實施例的投影鏡頭300中,該反射膜R2的最大 鏡徑為96.8mm,其中繼光學系統中最大鏡徑的透鏡為第三透鏡L3,其鏡徑為50mm,經計算其X=1.936,滿足:1.5≦X≦4;以及1.8≦X≦3等條件。透過前述設計,本發明之投影機100可以在有效地縮減投影鏡頭20之系統長度、大小與體積的情況下,實現出光角度大之效果,並可據以設計出短焦、小型化的投影鏡頭與投影機。 Please refer to FIG. 6, which is a projection lens 300 according to a third embodiment of the present invention, and its structure is substantially the same as the projection lens of the foregoing embodiment. In particular, the reflecting member of the projection optical system of this embodiment is provided with The reflective film R2 on the first optical surface S1 of the first lens L1 is taken as an example. The reflective film R2 may be formed by plating a metal film such as silver or aluminum on the first optical surface S1 of the first lens L1. Structure, but not limited to this, in other applications, reflective films made of other materials can also be used. For example, a dielectric film can also be used to form the reflective film, such as a ceramic dielectric coating (Dielectric Coating), not limited to the above-mentioned metal film. Among them, in the projection lens 300 of the third embodiment, the maximum of the reflective film R2 The lens diameter is 96.8mm, the lens with the largest lens diameter in the relay optical system is the third lens L3, and the lens diameter is 50mm. After calculation, X = 1.936, which satisfies: 1.5 ≦ X ≦ 4; and 1.8 ≦ X ≦ 3, etc. condition. Through the foregoing design, the projector 100 of the present invention can effectively reduce the system length, size, and volume of the projection lens 20 to achieve the effect of a large light angle, and can be used to design short-focus, miniaturized projection lenses. With the projector.
另外一提的是,前述第一透鏡L1的材質係可選用但不限於塑膠或玻璃,較佳者,於第三實施例中,該第一透鏡L1係由玻璃材質製成,藉以可採取較高溫的光學鍍膜製程,而可構成層數多且反射效率好的反射膜。 It is also mentioned that the material of the first lens L1 is optional but not limited to plastic or glass. Preferably, in the third embodiment, the first lens L1 is made of glass material. High-temperature optical coating process can form a reflective film with many layers and good reflection efficiency.
藉此,透過該影像光束P不穿出該第一透鏡L1之第一光學面S1,而是由設置於該第一光學面S1上的反射膜26對該影像光束P進行反射,以使得該影像光束P再度由第二光學面S2離開該第一透鏡L1的設計,可減少影像光束P品質的損失,以及降低影像光束P產生多餘、不必要之反射的機會,從而可降低或消除如鬼影、炫光等瑕疵,從而有助於提升成像品質。 Thereby, the image light beam P is not transmitted through the first optical surface S1 of the first lens L1, but is reflected by the reflective film 26 provided on the first optical surface S1, so that the The design that the image beam P leaves the first lens L1 again by the second optical surface S2 can reduce the quality loss of the image beam P and reduce the chance of the image beam P generating unnecessary and unnecessary reflections, thereby reducing or eliminating ghosts. Defects such as shadows and glare can help improve imaging quality.
補充一提的是,於本實施例中,在第一透鏡L1與第二透鏡L2之間同樣可設置有第一遮光件及/或第二遮光件,以遮蔽如雜散光等不必要之光線。 It is added that in this embodiment, a first light-shielding member and / or a second light-shielding member may also be provided between the first lens L1 and the second lens L2 to shield unnecessary light such as stray light. .
請參圖7所示,為本發明為本發明一第四實施例的投影鏡頭400,其架構與前述第一實施例的投影鏡頭100大致相同,其中,其反射件R1的鏡徑為49.64mm,其中繼光學系統當中最大鏡徑的透鏡係為第三透鏡L3,其鏡徑為31.6mm,經計算其X=1.5708,除滿足1.5≦X≦4之條件,除此之外,更滿足以下條件:0.5≦≦4,其中,D為該投影光學系統與該中繼光學系統之間的距離,M為該中繼光學系統中最大鏡徑之透鏡的鏡徑,於本實施例中,D為第二透鏡L2與第三透鏡L3於光軸A上的距離,該距離D為27.34mm,而其中繼光學系統中最大鏡徑之透鏡 為第三透鏡L3,第三透鏡L3的鏡徑為31.6mm,經計算其=0.865,滿足前述條件。透過前述設計,本發明之投影機可以在有效地縮減投影鏡頭之系統長度、大小與體積的情況下,實現出光角度大之效果,並可據以設計出短焦、小型化的投影鏡頭與投影機。 Please refer to FIG. 7, which is a projection lens 400 according to a fourth embodiment of the present invention. The structure of the projection lens 400 is substantially the same as the projection lens 100 of the first embodiment. The reflector R1 has a diameter of 49.64mm. The lens with the largest mirror diameter in the relay optical system is the third lens L3, whose mirror diameter is 31.6mm. After calculation, X = 1.5708, in addition to satisfying the condition of 1.5 ≦ X ≦ 4, in addition, it also meets the following Condition: 0.5 ≦ ≦ 4, where D is the distance between the projection optical system and the relay optical system, and M is the mirror diameter of the lens with the largest mirror diameter in the relay optical system. In this embodiment, D is the second lens The distance between L2 and the third lens L3 on the optical axis A, the distance D is 27.34mm, and the lens with the largest mirror diameter in the relay optical system is the third lens L3, and the third lens L3 has a mirror diameter of 31.6mm. Calculate it = 0.865, meeting the aforementioned conditions. Through the aforementioned design, the projector of the present invention can effectively reduce the system length, size, and volume of the projection lens to achieve a large light angle, and can be used to design short-focus, miniaturized projection lenses and projections. machine.
另外,請參圖8所示,為本發明一第五實施例的投影鏡頭500,其架構與前述第一實施例的投影鏡頭100大致相同,其中,其反射件R1的鏡徑為54.28mm,其中繼光學系統當中最大鏡徑的透鏡係為透鏡L12,其透鏡L12的鏡徑為25.14mm,其投影光學系統當中最大鏡徑之透鏡為第二透鏡L2,其第二透鏡L2的鏡徑為53.5mm,其投影光學系統與中繼光學系統之間的距離為D,該距離D為36.82mm,經計算其X=2.1591,滿足1.5≦X≦4之條件;Y=2.1280,滿足0.5≦Y≦4之條件;=1.4645,滿足0.5≦≦4之條件。 In addition, please refer to FIG. 8, which is a projection lens 500 according to a fifth embodiment of the present invention. The structure of the projection lens 500 is substantially the same as the projection lens 100 of the first embodiment. The reflector R1 has a diameter of 54.28 mm. The lens with the largest lens diameter in the following optical system is the lens L12, the lens diameter of the lens L12 is 25.14 mm, the lens with the largest lens diameter in the projection optical system is the second lens L2, and the lens diameter of the second lens L2 is 53.5mm, the distance between the projection optical system and the relay optical system is D, the distance D is 36.82mm, after calculation, X = 2.1591, which meets the condition of 1.5 ≦ X ≦ 4; Y = 2.1280, which meets 0.5 ≦ Y Condition ≦ 4; = 1.4645, satisfy 0.5 ≦ The condition of ≦ 4.
請參圖9所示,為本發明一第六實施例的投影鏡頭600,其架構與前述第一實施例的投影鏡頭100大致相同,其中,其反射件R1的鏡徑為54.66mm,其中繼光學系統當中最大鏡徑的透鏡係為透鏡L12,其透鏡L12的鏡徑為25mm,其投影光學系統當中最大鏡徑之透鏡為第二透鏡L2,其第二透鏡L2的鏡徑為64mm,其投影光學系統與中繼光學系統之間的距離為D,該距離D為41.45mm,經計算其X=2.1864,滿足1.5≦X≦4之條件;Y=2.56,滿足0.5≦Y≦4之條件;=1.658,滿足0.5≦≦4之條件。 Please refer to FIG. 9, which is a projection lens 600 according to a sixth embodiment of the present invention. The structure of the projection lens 600 is substantially the same as the projection lens 100 of the first embodiment. The reflector R1 has a mirror diameter of 54.66 mm. The lens with the largest lens diameter in the optical system is the lens L12. The lens diameter of the lens L12 is 25 mm. The lens with the largest lens diameter in the projection optical system is the second lens L2. The lens diameter of the second lens L2 is 64 mm. The distance between the projection optical system and the relay optical system is D, and the distance D is 41.45mm. After calculation, X = 2.1864, which satisfies the condition of 1.5 ≦ X ≦ 4; Y = 2.56, which satisfies the condition of 0.5 ≦ Y ≦ 4 ; = 1.658, satisfy 0.5 ≦ The condition of ≦ 4.
請參圖10所示,為本發明一第七實施例的投影鏡頭700,其架構與前述第一實施例的投影鏡頭100大致相同,其中,其中繼光學系統當中最大鏡徑的透鏡係為第三透鏡L3,其第三透鏡L3的鏡徑為36.8mm,其投影光學系統當中最大鏡徑之透鏡為第二透鏡L2,其第二 透鏡L2的鏡徑為52mm,其投影光學系統與中繼光學系統之間的距離為D,該距離D為26.8mm,經計算其Y=1.4130,滿足0.5≦Y≦4之條件;=0.7282,滿足0.5≦≦4之條件。 Please refer to FIG. 10, which shows a projection lens 700 according to a seventh embodiment of the present invention. The structure of the projection lens 700 is substantially the same as that of the projection lens 100 according to the first embodiment. The lens system with the largest lens diameter in the relay optical system is the first lens. Three lenses L3. The lens diameter of the third lens L3 is 36.8mm. The lens with the largest lens diameter in the projection optical system is the second lens L2. The lens diameter of the second lens L2 is 52mm. The projection optical system and relay The distance between the optical systems is D, and the distance D is 26.8mm. After calculation, Y = 1.4130, which satisfies the condition of 0.5 ≦ Y ≦ 4; = 0.7282, satisfy 0.5 ≦ The condition of ≦ 4.
值得一提的是,於其他應用上,上述各實施例的投影光學系統中不排除另外設置有一個或多個其他透鏡於第一透鏡L1、第二透鏡L2之間,而不以上述說明為限。但較佳者,於前述實施例當中,該投影光學系統24係只設置有該第一透鏡L1與該第二透鏡L2,如此一來,除了可降低該投影光學系統的透鏡數量,以降低其成本之外,基於透鏡數量的減少,更可減少透鏡之間產生不必要之光線反射的機會,從而可降低鬼影發生的機會,提高成像品質。另外,於一實施例當中,所述投影光學系統亦可設置有單一透鏡,而不以上述具有第一透鏡L1與第二透鏡L2的實施例為限。 It is worth mentioning that in other applications, the projection optical system of the above embodiments does not exclude that one or more other lenses are additionally provided between the first lens L1 and the second lens L2, and the above description is not used as limit. However, preferably, in the foregoing embodiment, the projection optical system 24 is only provided with the first lens L1 and the second lens L2. In this way, in addition to reducing the number of lenses of the projection optical system, In addition to cost, based on the reduction in the number of lenses, the chance of unnecessary light reflections between lenses can be reduced, which can reduce the chance of ghosting and improve imaging quality. In addition, in an embodiment, the projection optical system may also be provided with a single lens, and is not limited to the above embodiment having the first lens L1 and the second lens L2.
補充一提的是,透過上述參數設計,本發明除了可有效地縮短系統總長,以設計出短焦、小型化的投影機與投影鏡頭之外,由於本實施例之投影鏡頭的反射件與所有透鏡都在同一光學軸線上,因此,即使中繼光學系統中最靠近投影光學系統的透鏡(如第三透鏡)需作切邊處理,仍就可輕易地找到其光學軸心,從而可有效地提升生產上的量測精準度與生產良率。 It is added that through the above parameter design, the present invention can effectively shorten the total system length to design a short-focus, miniaturized projector and projection lens. The lenses are all on the same optical axis, so even if the lens closest to the projection optical system (such as the third lens) in the relay optical system needs to be trimmed, it can still easily find its optical axis, which can effectively Improve measurement accuracy and production yield in production.
以上所述僅為本發明較佳可行實施例而已,於本實施例當中,投影機以及投影鏡頭的光學架構係採取遠心系統(telecentric system)的設計,但於其他應用上,並不以此為限,於一實施例中,亦可採用非遠心系統(non-telecentric system)的設計。舉凡應用本發明 說明書及申請專利範圍所為之等效變化,理應包含在本發明之專利範圍內。 The above is only the preferred and feasible embodiment of the present invention. In this embodiment, the optical architecture of the projector and the projection lens adopts a telecentric system design, but in other applications, this is not the case. However, in one embodiment, a non-telecentric system design can also be adopted. Example of applying the present invention The equivalent changes in the description and the scope of patent application should be included in the patent scope of the present invention.
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TW200502585A (en) * | 2003-01-07 | 2005-01-16 | 3M Innovative Properties Co | Folded, telecentric projection lenses for use with pixelized panels |
JP2007212716A (en) * | 2006-02-09 | 2007-08-23 | Seiko Epson Corp | Image display device and projector |
CN102902046A (en) * | 2011-07-27 | 2013-01-30 | 精工爱普生株式会社 | Optical projection system and projector including the same |
TWI563335B (en) * | 2014-01-29 | 2016-12-21 | Yi-Rou Lin |
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TW526350B (en) * | 2000-07-05 | 2003-04-01 | Seiko Epson Corp | Illumination optical system and projector comprising the same |
TW200502585A (en) * | 2003-01-07 | 2005-01-16 | 3M Innovative Properties Co | Folded, telecentric projection lenses for use with pixelized panels |
JP2007212716A (en) * | 2006-02-09 | 2007-08-23 | Seiko Epson Corp | Image display device and projector |
CN102902046A (en) * | 2011-07-27 | 2013-01-30 | 精工爱普生株式会社 | Optical projection system and projector including the same |
TWI563335B (en) * | 2014-01-29 | 2016-12-21 | Yi-Rou Lin |
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