CN103064175A - The projection lens - Google Patents

The projection lens Download PDF

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Publication number
CN103064175A
CN103064175A CN 201110325104 CN201110325104A CN103064175A CN 103064175 A CN103064175 A CN 103064175A CN 201110325104 CN201110325104 CN 201110325104 CN 201110325104 A CN201110325104 A CN 201110325104A CN 103064175 A CN103064175 A CN 103064175A
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lens
projection
surface
projection lens
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CN 201110325104
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Chinese (zh)
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CN103064175B (en )
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廖陈成
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扬升照明股份有限公司
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Abstract

A projection lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens, wherein the first lens, the second lens, the third lens, the fourth lens and the fifth lens are arranged in order from the enlargement side to the diminution side. Diopter of the first lens, the second lens, the third lens, the fourth lens and the fifth lens is respectively negative, negative, positive, negative and positive. The diopter of the fourth lens is larger than that of the first lens and the second lens. Refractive index of the fourth lens is Nd and focal length of the fourth lens is f4. The focal length of fifth lens is f5. Due to the fact that the projection lens meets 0.45<|f4/ (f5*Nd)|<1.2, the projection lens has the advantages of being good in imaging quality and small in size.

Description

投影镜头 The projection lens

技术领域 FIELD

[0001] 本发明涉及一种镜头,且特别涉及一种投影镜头。 [0001] The present invention relates to a lens, and more particularly relates to a projection lens.

背景技术 Background technique

[0002] 随科技进步,微型投影镜头(Pico Projection Lens)逐渐成为市场的主流之一。 [0002] With advances in technology, micro-projection lens (Pico Projection Lens) has become one of the mainstream market. 微型投影镜头主要市场定位在可携带的个人电子产品,因此低价格也成为重要的因素。 The projection lens as the main market position in the personal portable electronic products, low prices and therefore also become an important factor. 另夕卜,微型投影机的重要特色是光源由传统的高压汞灯(UHP)改成环保省电的发光二极管灯源。 Another important feature Bu Xi, micro-projector light source by a conventional high pressure mercury lamp (UHP) changed LED light source saving and environmental protection. 然而,在体积缩小的同时又希望能保有高亮度,因此代表着镜头有较小的数值孔径(Fnumber),一般多为2. 4。 However, the reduced volume while hoping to maintain high luminance, and thus represent a small lens has a numerical aperture (fnumber), generally for 2.4. 为了获得更高的光通量,数值孔径必须缩小,其中使用大光圈镜头是另一有效的方法。 In order to obtain a higher flux, the numerical aperture must be reduced, a large aperture lens which is another effective method. 但是,孔径变大的同时镜片也相对变大,进而造成像差急剧增加,因此光学设计上困难度也就大大提升。 However, the pore size becomes large while the lens is relatively large, thus resulting in a sharp increase in aberrations, so the difficulty of the optical design also greatly enhanced. 一般来说,许多专利通常是使用非球面镜片来矫正像差或是增加镜片,如此一来,便会与减少成本的目标相互违背。 In general, many patents are generally used to correct the aberration aspherical lens or lenses increases, thus, would reduce the cost of the target contrary to each other.

[0003] 此外,微型投影镜头除了具有上述趋势外,另一重点就是短焦(Short ThrowRatio)。 [0003] Further, in addition to the above-described projection lens tendency, the other focus is at the short focal (Short ThrowRatio). 意即在相对短的投影距离,可投影出大的画面。 Meaning that a relatively short projection distance, a large screen can be projected. 然而,大的投影角将使得光学像差大幅度增加,因而在光学设计上矫正像差亦会变得困难。 However, a large projection angle so that the substantial increase in optical aberrations and thus also difficult to correct the aberration in the optical design.

[0004] 美国专利公告号第5933280号揭露一种投影镜头,其包含五个透镜,第一透镜为非球面、第二透镜为非球面、第三透镜为双凸透镜、第四透镜为非球面以及第五透镜为非球面,其中第三透镜的屈光度大于整个光学系统的屈光度的70%以上。 [0004] U.S. Patent Publication No. No. 5,933,280 discloses a projection lens, comprising five lenses, a first aspheric lens, the second aspheric lens, the third lens is a biconvex lens, and the fourth lens are aspherical more than 70% of the fifth lens is aspherical, wherein the refractive power of the third lens is larger than the refractive power of the entire optical system. 此外,透镜使用低分散高折射材料惯用于绿色画面的投影镜头、高分散高折射材料则用于红色以及蓝色的投影镜头。 In addition, low dispersion lens using a high refractive material is customary for the green picture is projected on the lens, a high refractive material high dispersion for the red and blue projection lens.

[0005] 美国专利公告号第7075622号揭露一种投影镜头,其包含六个透镜,依序为负的第一透镜、正的第二透镜、负的第三透镜、负的第四透镜、正的第五透镜以及正的第六透镜,其中第四透镜以及第五透镜为胶合透镜40。 [0005] U.S. Patent Publication No. No. 7,075,622 discloses a projection lens which includes six lens, a first negative lens sequentially, a second positive lens, a negative third lens element, a negative fourth lens element, a positive a positive fifth lens and a sixth lens, wherein the fourth lens and the fifth lens is a cemented lens 40. 另外,第一透镜以及第二透镜具有消除轴外慧差、像散以及畸变,其中适当地排列第二透镜、第三透镜以及第四透镜可以使进入第四透镜的光几乎平行于光轴而使进入第四透镜的光不会有色差的发生。 Further, the first lens and a second lens having eliminate off-axis coma aberration, astigmatism and distortion, wherein the second lens is appropriately aligned, the third lens and the fourth lens enables the light enters the fourth lens is almost parallel to the optical axis the light enters the fourth lens chromatic aberration does not occur.

[0006] 美国专利公告号第6124978号揭露一种投影镜头,其为一高斯结构并包含六个透镜,其中这些透镜依序为正屈光率的第一透镜、负屈光率的第二透镜、第三透镜包含负屈光率的透镜以及正屈光率透镜、正屈光率的第四透镜以及正屈光率的第五透镜。 [0006] U.S. Patent Publication No. No. 6,124,978 discloses a projection lens, which is a Gaussian configuration and includes six lens, wherein the lens is a first lens sequentially a positive refractive power, negative refractive power of the second lens the third lens comprises a lens of negative refractive power and positive refractive power lens, the fourth lens and the fifth lens having positive refractive power of the positive refractive power. 特别的是,此结构可以达到校正像散、孔径数值小以及光学结构总长短的目的。 In particular, this configuration can achieve correct astigmatism, the small numerical aperture and an optical structure of the total length of the object.

[0007] 美国专利公告号第7679832号揭露一种投影镜头,其由五个透镜所组成。 [0007] U.S. Patent Publication No. No. 7,679,832 discloses a projection lens, which is composed of five lenses. 这些透镜依序为负屈光率的第一透镜、正屈光率的第二透镜、具有正的屈光率的第三透镜,该第三透镜包含正屈光率的透镜及负屈光率的透镜、以及正屈光率的第四透镜。 These lenses sequentially to a first lens having a negative refractive power, positive refractive power of the second lens, a third lens having a positive refractive power, the third lens comprises a positive refractive power and the negative refractive power of the lens lens, and a fourth lens having a positive refractive power. 此投影镜头可以达到光学结构总长短、可视角广以及分辨率高的优点。 This projection lens can achieve a total length of optical structures, wide viewing angle and high resolution advantages.

发明内容 SUMMARY

[0008] 本发明提出一种投影镜头,其具有较佳的成像质量与小体积的优点。 [0008] The present invention provides a projection lens, which has the advantage of better image quality and small size. [0009] 本发明的其它目的和优点可以从本发明所揭露的技术特征中得到进一步的了解。 [0009] Other objects and advantages of the present invention may be further understood from the technical features disclosed in the present invention.

[0010] 为达上述的一或部分或全部目的或是其它目的,本发明的一实施例提供一种投影镜头,其包括由放大侧至缩小侧依序排列的第一透镜、第二透镜、第三透镜、第四透镜与第五透镜。 [0010] In order to achieve a part of or all of the above-described object or other objects, an embodiment of the present invention provides a projection lens, which lens comprises a first side to the reduction side of the zoom sequentially arranged, the second lens, the third lens, the fourth lens and the fifth lens. 第一透镜、第二透镜、第三透镜、第四透镜与第五透镜的屈光度分别为负、负、正、负、正。 A first lens, second lens, third lens, fourth lens and the fifth lens diopter are negative, negative, positive, negative, positive. 第四透镜的屈光度大于第一透镜与第二透镜的屈光度。 It is greater than the refractive power of the fourth lens refractive power of the first lens and the second lens. 另外,第四透镜的折射率为Nd且焦距为&,而第五透镜的焦距为f5,其中投影镜头满足0.45 < f4/(f5XNd) <1.2。 The refractive index of the fourth lens and the focal length is & Nd, and the fifth lens focal length f5, wherein the projection lens satisfies 0.45 <f4 / (f5XNd) <1.2.

[0011] 在本发明一实施例中,第三透镜的焦距为f3,而第五透镜靠近缩小侧的表面至图像处理元件之间的距离为dBF,其中投影镜头满足0. 45 < dBF/f3 <1. 3。 [0011] In an embodiment of the present invention, the focal length of the third lens is f3, and reduce the distance between the fifth lens closer to the image surface side is dBF processing element, wherein the projection lens satisfies 0. 45 <dBF / f3 <1.3.

[0012] 在本发明一实施例中,第一透镜与第二透镜至少各有一表面为非球面。 [0012] In an embodiment of the present invention, the first lens and the second lens each have at least one aspherical surface.

[0013] 在本发明一实施例中,第三透镜、第四透镜与第五透镜至少其二各有一表面为非球面。 [0013] In an embodiment of the present invention, the third lens, the fourth lens and the fifth lens have at least a Second aspheric surface.

[0014] 在本发明一实施例中,第一透镜与第二透镜各为凸面朝向放大侧的凸凹透镜。 [0014] In an embodiment of the present invention, each of the first lens and the second lens is a meniscus lens convex surface directed to the magnification side. 第三透镜为双凸透镜,第四透镜为双凹透镜,第五透镜为双凸透镜。 The third lens is a biconvex lens, the fourth lens is a biconcave lens, the fifth lens is a biconvex lens.

[0015] 在本发明一实施例中,第一透镜、第二透镜、第三透镜与第四透镜的各表面为非球面。 [0015] In an embodiment of the present invention, the first lens, second lens, each lens surface of the third and the fourth lens are aspherical.

[0016] 在本发明一实施例中,第一透镜为凸面朝向放大侧的凸凹透镜,第二透镜为双凹透镜,第三透镜为双凸透镜,第四透镜为双凹透镜,第五透镜为双凸透镜。 [0016] In an embodiment of the present invention, the first lens is a concave lens having a convex surface directed to the magnification side, a second lens is a biconcave lens, a third lens is a biconvex lens, the fourth lens is a biconcave lens, the fifth lens is a biconvex lens .

[0017] 在本发明一实施例中,第一透镜、第二透镜、第四透镜与第五透镜的各表面为^ _求面。 [0017] In an embodiment of the present invention, the first lens, second lens, each surface of the fourth lens and the fifth lens surface is ^ _ requirements.

[0018] 在本发明一实施例中,投影镜头还包括孔径光阑,其中孔径光阑配置于第三透镜与第四透镜之间。 [0018] In an embodiment of the present invention, the projection lens further comprising an aperture stop, wherein the aperture stop is disposed between the third lens and the fourth lens.

[0019] 在本发明一实施例中,投影镜头的数值孔径落在2. 2与2. 0之间。 [0019] In an embodiment of the present invention, the numerical aperture of projection lenses falls between 2.2 and 2.0.

[0020] 基于上述,本发明的实施例可达到下列优点或功效的至少其一。 [0020] at least one of the above, embodiments of the present invention can achieve the following advantages or effects. 藉由第四透镜以矫正投影镜头在大光圈时所产生的球差,如此,将可在大光圈下呈现良好的图像投影。 By the fourth lens in order to correct large aperture projection lens when the spherical aberration is generated, so the projected image can exhibit good at large aperture. 此夕卜,投影镜头亦可同时藉由满足0.45 < f4/(f5XNd) <1. 2,而可有效地矫正投影时所产生的色差进而可提供质量较佳的投影画面。 This Bu Xi, by a projection lens while also satisfying 0.45 <f4 / (f5XNd) <1. 2, and can effectively correct chromatic aberration generated by the projection in turn can provide better quality projection screen. 另外,投影镜头亦可满足0. 45 < dBF/f3 <1. 3,当条件超过上限时,背焦距(Back Focal length, BF)相对变大,无法满足微型(Compact)的条件,同时轴外像差急速变差,当条件超过下限时,BF相对变小,容易与照明系统产生机构上的干涉与碰撞,且易产生周边光量不足。 Further, the projection lens may satisfy 0. 45 <dBF / f3 <1. 3, when the condition exceeds the upper limit, the back focal length (Back Focal length, BF) is relatively large, the micro (Compact) condition can not be met, while the outer shaft aberration deteriorates rapidly, when the condition exceeds the lower limit, BF relatively small, easy to interfere with the collision the mechanism illumination system, and easy to produce insufficient peripheral light.

[0021] 为让本发明的上述特征和优点能更明显易懂,下文特举多个实施例,并结合附图,作详细说明如下。 [0021] In order to make the above features and advantages of the invention more comprehensible, several embodiments a plurality of embodiments below, in conjunction with the accompanying drawings, described in detail below.

附图说明 BRIEF DESCRIPTION

[0022] 图1为本发明一实施例的投影镜头的示意图; [0022] FIG 1 illustrates a projection lens according to an embodiment of the present invention;

[0023] 图2A至图2D与图3为图1的投影镜头的成像光学仿真数据图; [0023] FIGS. 2A to 2D and FIG. 3 is a view of the projection lens 1 of FIG imaging optical simulation data;

[0024] 图4为本发明另一实施例的投影镜头的示意图; [0024] Fig 4 a schematic view of another embodiment of the projection lens of the embodiment of the present invention;

[0025] 图5A至图与图6为图4的投影镜头的成像光学仿真数据图; [0025] FIG 5A to FIG. 6 is a view of the imaging optical simulation data of the projection lens 4;

具体实施方式 detailed description

[0026] 有关本发明的前述及其它技术内容、特点与功效,在以下结合附图的多个实施例的详细说明中,将可清楚的呈现。 [0026] The foregoing and other related technical contents, characteristics and effects of the present invention, a plurality of the following detailed description in conjunction with the accompanying drawings of the embodiments, will be apparent to presentation. 以下实施例中所提到的方向用语,例如「上」、「下」、「前」、「后」、「左」、「右」等,仅是参考附图的方向。 Directional phrases mentioned embodiments in the following examples, such as "upper", "lower", "front", "rear", "left", "right", etc., it is only with reference to the accompanying drawings direction. 因此,使用的方向用语是用来说明,而非用来限制本发明。 Accordingly, the directional terms used are intended to illustrate and not to limit the invention.

[0027] 图1为本发明一实施例的投影镜头的示意图。 [0027] FIG. 1 is a schematic view of a projection lens according to an embodiment of the present invention. 请参考图1,本实施例的投影镜头100包括由放大侧至缩小侧依序排列的第一透镜110、第二透镜120、第三透镜130、第四透镜140与第五透镜150。 Referring to FIG. 1, the projection lens 100 of the present embodiment includes a first embodiment of the zoom lens from the side to the reduction side 110 sequentially arranged, a second lens 120, third lens 130, fourth lens 140 and the fifth lens 150. 第一透镜110、第二透镜120、第三透镜130、第四透镜140与第五透镜150的屈光度分别为负、负、正、负、正。 A first lens 110, second lens 120, third lens 130 refractive power, the fourth lens and the fifth lens 150, 140 are negative, negative, positive, negative, positive. 在本实施例中,第一透镜110与第二透镜120皆为凸面朝向放大侧的凸凹透镜、第三透镜130为双凸透镜、第四透镜140为双凹透镜以及第五透镜150为双凸透镜,如图1所示。 In the present embodiment, the first lens 110 and second lens 120 are both concave lens having a convex surface facing an enlarged side, the third lens 130 is a biconvex lens, the fourth lens 140 is biconcave lens and a fifth lens 150 is a biconvex lens, such as 1 shown in FIG.

[0028] 另外,第四透镜140的屈光度大于第一透镜110与第二透镜120的屈光度,以矫正投影镜头100在进行投影时所产生的球差现象,如此,投影镜头100在进行大角度图像投影时,将可在短焦距下呈现良好的图像投影,如:高分辨率的投影图像。 [0028] Moreover, refractive power of the fourth lens 140 is larger than the refractive power of the first lens 110 and second lens 120, spherical aberration phenomenon when the correction to the projection lens 100 during the projection generated, so the projection lens 100 during the wide-angle image when the projector, the projection image can exhibit good at short focal length, such as: high resolution projected image. 意即,本实施例的投影镜头100可利用第四透镜140具有较大屈光能力的特性以呈现较佳的光学表现。 Which means, the projection lens of the present embodiment using the fourth embodiment 100 of the lens 140 may have a larger refractive characteristic ability to exhibit better optical performance. 此外,在矫正投影镜头100在进行投影时所产生的色差现象上,投影镜头100可藉由满足下列条件式(一),而可有效地矫正投影时所产生的色差进而可提供质量较佳的投影画面。 Further, the chromatic aberration phenomenon when the projection lens 100 is performed to correct the generated projection, by the projection lens 100 may satisfy the following conditional expression (a), and can effectively correct chromatic aberration generated by the projection in turn can provide better quality projection screen.

[0029] 0. 45 < I f4/(f5XNd4) <1. 2 ...............条件式(一) [0029] 0. 45 <I f4 / (f5XNd4) <1. 2 ............... conditional expression (a)

[0030] 其中第四透镜140的折射率为Nd4且焦距为f4,而第五透镜150的焦距为f5。 [0030] wherein the refractive index of the fourth lens 140 is Nd4 and focal length f4, the focal length of the fifth lens 150 is f5.

[0031] 此外,为了可使投影镜头100具有较大的系统光圈,即较小的孔径数值(Fnumber),因此本实施例的投影镜头100可于满足上述条件式(一)下,并同时满足下列条件式(二),如此将可使投影镜头100的数值孔径落在2. 2与2. 0之间,甚至小于2. O。 [0031] Further, in order to allow the projection lens system 100 has a large aperture, i.e., a smaller numerical aperture (fnumber), and the projector lens 100 of the present embodiment can satisfy the above conditions in the formula (a), and simultaneously satisfy the following conditional expression (B), so the numerical aperture of the projection lens 100 can fall between 2.2 and 2.0, even less than 2. O.

[0032] 0. 45 < dBF/f3 <1. 3 ...............条件式(二) [0032] 0. 45 <dBF / f3 <1. 3 ............... conditional formula (II)

[0033] 其中第三透镜130的焦距为f3,而第五透镜150靠近缩小侧的表面SlO至图像处理元件160之间的距离为dBF。 [0033] wherein the focal length of the third lens element 130 is f3, and the fifth lens 150 is close to the narrow side surface SlO distance between the image processing device 160 is dBF.

[0034] 详细来说,第五透镜150靠近缩小侧的表面SlO至图像处理元件160之间的距离为dBF会因调焦而dBF有所变动,因此,dBF可定义为投影镜头100在合理的投影距离约IM到3M时,其对焦清楚时的后焦距。 [0034] Specifically, the fifth lens 150 is close to the narrow side surface SlO distance between the image processing device 160 due to focusing dBF dBF is subject to change and, therefore, may be defined as the projection lens 100 dBF reasonable when the projection distance of about IM to 3M, the back focal length of its apparent focus. 在本实施例中,若投影镜头100满足dBF/f3 >1. 3时,dBF便会相对变大,而无法满足微型(Compact)的条件,同时轴外像差亦会急速变差;若投影镜头100满足0. 45 > (^/%时,则容易与照明系统产生机构上的干涉与碰撞,而易产生周边光量不足。换言之,投影镜头100可藉由适当地设计第三透镜130的焦距为f3与第五透镜150至图像处理元件160的距离dBF之间的关系,而可有效地提升投影画面的质量外,并可同时具有体积微型化的优点。 In the present embodiment, if the projection lens 100 satisfies dBF / f3> 1 3, dBF will be relatively large, and the micro (Compact) condition can not be met, while off-axis aberrations will rapidly deteriorate; if the projection lens 100 satisfies 0.45> when (^ /%, the interference and collision mechanism is likely to occur on the illumination system, easily produce insufficient peripheral light. in other words, the projection lens 100 can be properly designed by the focal length of the third lens 130 relationship between f3 and the fifth lens element 150 to the image processing from dBF 160, and can effectively improve the quality of the projected image, the volume can be miniaturized while having advantages.

[0035] 另外,为了更进一步改善投影镜头100于投影时可能产生的彗差(Coma)、像散(Astigmatism)或畸变(Distortion)的问题,因此,第一透镜110与第二透镜120至少各有一表面为非球面,其中本实施例是以第一透镜110与第二透镜120各自的两表面皆采用非球面设计,如后续段落中的文字说明。 [0035] Further, in order to further improve the coma aberration may be generated when the projection lens 100 of the projection (Coma), astigmatism problem (Astigmatism) and distortion (Distortion) is, therefore, a first lens 110 and second lens 120 at least one each a aspheric surface, which is a first embodiment according to the present embodiment lens 110 and the respective two surfaces of the second lens 120 are aspheric design, such as the text in the following paragraphs. 也就是说,本实施例的投影镜头可藉由使第一透镜110与第二透镜120至少各有一表面为非球面,而可消除光轴外的像差。 That is, the projection lens of the present embodiment can 110 by the first lens and the second lens 120 have at least one aspherical surface, and the aberrations of the optical axis can be eliminated. 再者,由于本实施例的投影镜头100可呈现较大的投影角度,因此本实施例可藉由将第三透镜130、第四透镜140与第五透镜150至少其二的表面设计为非球面,以矫正投影镜头100于短焦距下投影时容易产生的畸变,其中本实施例是以第一透镜110、第二透镜120、第三透镜130与第四透镜140的各表面为非球面作为举例说明。 Further, since the projection lens 100 of the present embodiment may exhibit a large projection angle, and therefore the present embodiment can be by a third lens 130, fourth lens and the fifth lens 150 at least 140 Second aspheric surface design to correct distortion of the projection lens 100 at the time of short focal length projection likely to occur, which is a first embodiment according to the present embodiment lens 110, second lens 120, third lens 130 with the surface of the fourth lens 140 is aspherical way of example instructions.

[0036] 一般而言,位于缩小侧可设置有上述的图像处理兀件160(Image ProcessingDevice)。 [0036] Generally speaking, it may be located on the reduction side provided with the image processing Wu member 160 (Image ProcessingDevice). 在本实施例中,图像处理元件160可以是光阀(Light Valve)或感光元件。 In the present embodiment, the image processing device 160 may be a light valve (Light Valve) or a photosensitive member. 另夕卜,还可配置玻璃盖以保护图像处理元件160。 Another Bu Xi, the cover glass may also be configured to protect the image processing element 160. 在本实施例中,投影镜头100可使位于缩小侧的图像投影至放大侧,以进行图像投影。 In the present embodiment, the projection lens 100 is located allows reduced image magnification side to the projection side, to project an image.

[0037] 除此之外,投影镜头100还可包括孔径光阑170,其中孔径光阑170配置于第三透镜130与第四透镜140之间,如图1所示。 [0037] In addition, the projection lens 100 further includes an aperture stop 170, wherein the aperture stop 170 is disposed between the third lens 130 and fourth lens 140, as shown in FIG.

[0038] 补充说明一点,于设计投影镜头100时,不限定投影镜头100需同时满足上述所列的条件,而是视光学成像质量的需求,选择性地满足上述所列的条件。 [0038] Supplementary Note that at the time of design of the projection lens 100, the projection lens 100 is not limited to the conditions to simultaneously satisfy the above-listed, but the quality of the optical image as needed, the conditions listed above are selectively satisfied.

[0039] 以下内容将举出投影镜头100的一实施例。 [0039] The following will include a projection lens 100 of the embodiment. 需注意的是,下述的表一中所列的数据并非用以限定本发明,任何本领域技术人员在参照本发明之后,当可应用本发明的原则对其参数或设定作适当的更动,惟其仍应属于本发明的范畴内。 It should be noted that the data listed in the table below in a not intended to limit the present invention, anyone skilled in the art after referring to the present invention, when the principles of the present invention can be applied for more suitable settings or parameters thereof action, although its should still fall within the scope of the invention.

[0040]表一 [0040] Table I

[0041] [0041]

Figure CN103064175AD00061

[0042] [0042]

Figure CN103064175AD00062

[0043] 在表一中,间距是指两相邻表面间于投影镜头100的光轴A上的直线距离,举例来说,表面SI的间距,即表面SI至表面S2间于光轴A上的直线距离。 [0043] In Table I, the pitch is a straight line between two adjacent surfaces of the projection lens on the optical axis of the distance A 100 is, for example, the pitch of the surface SI, SI i.e. surface to surface S2 on the optical axis between A the straight-line distance. 备注栏中各透镜所对应的厚度、折射率与阿贝数请参照同列中各间距、折射率与阿贝数对应的数值。 Remark column corresponding to the thickness of each lens, and a refractive index Abbe number refer to each spacing, and refractive index values ​​in the same column corresponding to the Abbe number. 此外,在表二中,表面S1、S2为第一透镜110的两表面,表面S3、S4为第二透镜120的两表面,其中S3表面因为非球面设计的关系该表面实质上为凸面,表面S5、S6为第三透镜130的两表面,表面S7、S8为第四透镜140的两表面,表面S9、S10为第五透镜150的两表面。 Further, in Table II, the surfaces S1, S2 of the two surfaces of the first lens 110, the surface S3, S4 as the two surfaces of the second lens 120, because the relationship between the surface S3 wherein the aspheric surface is essentially designed as a convex surface S5, S6 for the two surfaces of the third lens 130, surfaces S7, S8 to two surfaces of the fourth lens 140, surfaces S9, S10 of the fifth lens surface 150 is two. 有关于各表面的曲率半径、间距等参数值,请参照表一,在此不再重述。 Parameters about the radius of curvature of each surface, spacing, etc., refer to a table, which is not repeated here.

[0044] 另外,上述表面SI〜S8为偶次项非球面,而其可用下列公式表示: [0044] Further, the surface is even SI~S8 aspheric surface, and which can use the following formula:

Figure CN103064175AD00071

[0047] 式中,Z为光轴A方向的偏移量(Sag), c是密切球面(Osculating Sphere)的半径的倒数,也就是接近光轴A处的曲率半径(如表二中S1、S2的曲率半径)的倒数。 [0047] In the formula, Z is the offset (in Sag) A direction of the optical axis, c is an osculating sphere (Osculating Sphere) of the reciprocal of the radius, which is close to the radius of curvature at the optical axis A (as shown in Table II Sl, S2 is the reciprocal of the radius of curvature). k是二次曲面系数(Conic),r是非球面高度,即为从透镜中心往透镜边缘的高度,而A2、A4、A6、A8、A1(l、A12、A14…为非球面系数(Aspheric Coefficient),在本实施例中系数A2为0。下列表二所列出的是表面SI〜S8的非球面参数值。 k is a quadratic surface coefficient (Conic), r is an aspherical surface height, i.e. the height from the lens center to the lens edge, and the A2, A4, A6, A8, A1 (l, A12, A14 ... aspheric coefficients (Aspheric Coefficient ), in the present embodiment, the coefficient A2 is 0. list two lists the aspherical surface SI~S8 of parameter values.

[0048]表二 [0048] Table II

Figure CN103064175AD00072

[0050] [0050]

Figure CN103064175AD00081

[0051 ] 图2A至图2D与图3为图1的投影镜头的成像光学仿真数据图。 [0051] FIGS. 2A to 2D and FIG. 3 is a simulation of the optical imaging data of the projection lens of FIG. 1 FIG. 详细而言,图2A为球差(Spherical Aberration)的仿真图形,其中图2A是以二种不同波长(分别为460nm、550nm)的光所模拟出来的。 Specifically, FIG 2A is a spherical aberration (Spherical Aberration) pattern simulation, wherein FIG. 2A is two different wavelengths (respectively 460nm, 550nm) light out of the analog. 图2B为像散(Astigmatism)的仿真图形,其中图2B是以二种不同波长(分别为460nm、550nm)的光所模拟出来的。 2B is an astigmatism (Astigmatism) pattern simulation, wherein FIG. 2B are two different wavelengths (respectively 460nm, 550nm) of a simulated light. 图2C为畸变(Distortion)的仿真图形,其中图2C是以一种波长(如:680nm)的光所模拟出来的。 2C is a distortion (Distortion) pattern simulation, wherein FIG. 2C is one wavelength: light (e.g., 680 nm) of the simulated. 图2D为横向色差的仿真图形,且图2D是以一种波长(如:550nm)的光所模拟出来的。 FIG 2D is a simulation graphics lateral chromatic aberration, and Fig. 2D is one wavelength: light (e.g., 550nm) of the simulated. 另外,图3为光扇图分析(RayFan)的仿真图形,其中图3是以三种不同波长(分别为460nm、550nm、680nm)的光所模拟出来的。 Further, FIG. 3 is a simulated light ray fan plot analysis (Rayfan) pattern simulation, wherein FIG. 3 is a three different wavelengths (respectively 460nm, 550nm, 680nm) of. 由于图2A至图2D以及图3所显示出的图形均在标准的范围内,由此可验证本实施例的投影镜头100确实能够具有良好的光学成像质量。 Since FIGS. 2A to 2D and FIG. 3 shows the pattern are within the scope of the standard, thereby verify the projection lens 100 of the present embodiment can indeed have good optical imaging quality.

[0052] 图4为本发明另一实施例的投影镜头的示意图。 [0052] Fig 4 a schematic view of another embodiment of a projection lens of the embodiment of the present invention. 请同时参考图1与图4,本实施例的投影镜头200与前述的投影镜头100采用相似的概念与结构。 Please refer to FIG. 1 and FIG. 4, the projection lens 200 of the present embodiment and the embodiment of the projection lens 100 and a similar concept structures. 具体而言,第一透镜210为凸面朝向放大侧的凸凹透镜,第二透镜220为凸面朝向放大侧的凸凹透镜,第三透镜230为双凸透镜,第四透镜240为双凹透镜,第五透镜250为双凸透镜。 Specifically, the first lens 210 is a concave lens having a convex surface directed to the magnification side, a second lens 220 is a concave lens having a convex surface directed to the magnification side, a third lens 230 is a biconvex lens, the fourth lens 240 is biconcave lens, the fifth lens 250 as a lenticular lens. 在本实施例中,第一透镜210、第二透镜220、第四透镜240与第五透镜250的各表面为非球面,意即第一透镜210、第二透镜220、第四透镜240与第五透镜250是采用非球面透镜。 In the present embodiment, the first lens 210, second lens 220, fourth lens 240 with the surface of the fifth lens 250 is aspherical, which means that the first lens 210, second lens 220, fourth lens 240 and the second five aspheric lens 250 is a lens.

[0053] 在投影镜头200中,由于第四透镜240的屈光度亦大于第一透镜210与第二透镜220的屈光度,且投影镜头200亦满足前述条件式(一)或条件式(二),因此,本实施例的投影镜头200亦具有上述投影镜头100所提及的优点与功效。 [0053] In the projection lens 200, since the refractive power of the fourth lens 240 is also greater than the refractive power of the first lens 210 and the second lens 220 and the projection lens 200 also satisfies the condition of formula (a) or condition of the formula (II), and therefore the projection lens 200 of the present embodiment also has the projection lens 100 mentioned advantages and effects.

[0054] 类似地,为了更进一步改善投影镜头200于投影时可能产生的彗差(Coma)、像散(Astigmatism)或畸变(Distortion)的问题,因此,第一透镜210与第二透镜220至少各有一表面为非球面,其中本实施例是以第一透镜210与第二透镜220的双面皆采用非球面设计,如后续段落中的文字说明。 [0054] Similarly, in order to further improve the coma aberration may be generated when the projection lens 200 to the projection (Coma), astigmatism (Astigmatism) or distortion problems (Distortion), and therefore, the first lens and the second lens 220 at least 210 have an aspheric surface, which is a first embodiment according to the present embodiment lens 210 and second lens 220 are double-sided aspherical design, such as the text in the following paragraphs. 也就是说,本实施例的投影镜头可藉由使第一透镜210与第二透镜220至少各有一表面为非球面,而可消除光轴外的像差。 That is, the projection lens of the present embodiment may be by a surface 210 of the first lens and the second lens each have an aspheric surface at least 220, and can eliminate the aberrations of the optical axis. 再者,由于本实施例的投影镜头200可呈现较大的投影角度,因此本实施例可藉由将第三透镜230、第四透镜240与第五透镜250至少其二表面设计为非球面,以矫正投影镜头200于短焦距下投影时容易产生的畸变,其中本实施例是以第一透镜210、第二透镜220、第四透镜240与第五透镜250的各表面为非球面作为举例说明。 Further, since the projection lens 200 of the present embodiment can exhibit a large projection angle, and therefore the present embodiment can be by a third lens 230, fourth lens and the fifth lens 250 at least 240 Second aspheric surface design, projection lens 200 to correct the distortion at the short focal length likely to occur when projected, which is a first embodiment according to the present embodiment lens 210, second lens 220, fourth lens 240 with the surface of the fifth lens 250 is aspherical, as exemplified .

[0055] 以下内容将举出投影镜头200的一实施例。 [0055] The following will include a projection lens 200 of the embodiment. 需注意的是,下述的表三中所列的数据并非用以限定本发明,任何本领域技术人员在参照本发明之后,当可应用本发明的原则对其参数或设定作适当的更动,其仍应属于本发明的范畴内。 It should be noted that the data listed in Table III below are not intended to limit the present invention, anyone skilled in the art after referring to the present invention, when the principles of the present invention can be applied appropriately setting its parameters or more action, which should still fall within the scope of the invention.

[0056] 表三 [0056] Table III

Figure CN103064175AD00091

、[0059] , [0059]

[0060] 在表三中,间距是指两相邻表面间于投影镜头200的光轴A上的直线距离,举例来说,表面SI的间距,即表面SI至表面S2间于光轴A上的直线距离。 [0060] In Table III, refers to the spacing between two adjacent linear distance on the surface of the projection lens optical axis A 200 of, for example, the pitch of the surface SI, SI i.e. surface to surface S2 on the optical axis between A the straight-line distance. 备注栏中各透镜所对应的厚度、折射率与阿贝数请参照同列中各间距、折射率与阿贝数对应的数值。 Remark column corresponding to the thickness of each lens, and a refractive index Abbe number refer to each spacing, and refractive index values ​​in the same column corresponding to the Abbe number. 此外,在表三中,表面S1、S2为第一透镜210的两表面,表面S3、S4为第二透镜220的两表面,表面S5、S6为第三透镜230的两表面,表面S7、S8为第四透镜240的两表面,表面S9、S10为第五透镜250的两表面。 Further, in Table III, the surfaces S1, S2 of the two surfaces of the first lens 210, the surface S3, S4 as the two surfaces of the second lens 220, the surface S5, S6 for the two surfaces of the third lens 230, surfaces S7, S8 two surfaces of the fourth lens 240, the surface S9, S10 are two surfaces 250 of the fifth lens. 有关于各表面的曲率半径、间距等参数值,请参照表四,在此不再重述。 Parameters about the radius of curvature of each surface, spacing, see Table IV is not repeated.

[0061] 另外,上述表面SI〜S4、S7〜SlO为偶次项非球面,而其可用下列公式表示: [0061] Further, the surface SI~S4, S7~SlO an even aspheric surface, and which can use the following formula:

[0062] [0062]

Figure CN103064175AD00092

[0064] 式中,Z为光轴A方向的偏移量(Sag), c是密切球面(Osculating Sphere)的半径的倒数,也就是接近光轴A处的曲率半径(如表二中S1、S2的曲率半径)的倒数。 [0064] In the formula, Z is the offset (in Sag) A direction of the optical axis, c is an osculating sphere (Osculating Sphere) of the reciprocal of the radius, which is close to the radius of curvature at the optical axis A (as shown in Table II Sl, S2 is the reciprocal of the radius of curvature). k是二次曲面系数(Conic),r是非球面高度,即为从透镜中心往透镜边缘的高度,而A2、A4、A6、A8、A1(l、A12、A14…为非球面系数(Aspheric Coefficient),在本实施例中系数A2为0。下列表二所列出的是表面SI〜S4、S7〜SlO的非球面参数值。 k is a quadratic surface coefficient (Conic), r is an aspherical surface height, i.e. the height from the lens center to the lens edge, and the A2, A4, A6, A8, A1 (l, A12, A14 ... aspheric coefficients (Aspheric Coefficient ), in the present embodiment, the coefficient A2 is 0. listed in the list of two surface SI~S4, the aspherical parameters of S7~SlO.

[0065] 表四 [0065] Table IV

Figure CN103064175AD00101

[0068] 图5A至图与图6为图4的投影镜头的成像光学仿真数据图。 [0068] FIG 5A to FIG. 6 and FIG. 4 is a projection lens of the imaging optical simulation data of FIG. 详细而言,图5A为球差(Spherical Aberration)的仿真图形,其中图5A是以二种不同波长(分别为460nm、550nm)的光所模拟出来的。 Specifically, FIG 5A is a spherical aberration (Spherical Aberration) pattern simulation, wherein FIG 5A is two different wavelengths (respectively 460nm, 550nm) of a simulated light. 图5B为像散(Astigmatism)的仿真图形,其中图5B是以二种不同波长(分别为460nm、550nm)的光所模拟出来的。 5B is astigmatism (Astigmatism) pattern simulation, wherein FIG. 5B is two different wavelengths (respectively 460nm, 550nm) of a simulated light. 图5C为畸变(Distortion)的仿真图形,其中图5C是以一种波长(如:680nm)的光所模拟出来的。 5C is a graphic simulation of a distortion (Distortion), wherein FIG. 5C is one wavelength (eg: 680nm) of the light is simulated. 图为横向色差的仿真图形,且图是以一种波长(如:550nm)的光所模拟出来的。 The picture shows the simulation graphics lateral chromatic aberration, and is one wavelength FIG (eg: 550nm) of the light is simulated. 另外,图6为光扇图分析(RayFan)的仿真图形,其中图3是以三种不同波长(分别为460nm、550nm、680nm)的光所模拟出来的。 Further, FIG. 6 is a simulated light ray fan plot analysis (Rayfan) pattern simulation, wherein FIG. 3 is a three different wavelengths (respectively 460nm, 550nm, 680nm) of. 由于图5A至图以及图6所显示出的图形均在标准的范围内,由此可验证本实施例的投影镜头200确实能够具有良好的光学成像质量。 Since 5A to FIG 6 and shows the pattern are within the scope of the standard, thereby verify the projection lens 200 of the present embodiment can have a really good optical imaging quality.

[0069] 综上所述,本发明的投影镜头至少具有以下优点。 [0069] As described above, the projection lens of the present invention has at least the following advantages. 首先,藉由使第四透镜的屈光能力大于第一透镜与第二透镜的屈光能力,意即本实施例的投影镜头可利用第四透镜具有较大屈光能力的特性用以矫正投影镜头在进行投影时所产生的球差现象,如此,投影镜头在进行大角度图像投影时,将可在短焦距下呈现良好的图像投影。 First properties, by making the refractive power of the fourth lens is larger than the refractive power of the first lens and the second lens, which means projection lens of the present embodiment may utilize a fourth lens having a large optical power for correcting a projection during the lens projecting the generated spherical aberration phenomenon, thus, a large angle projection lens during image projection, the projected image can exhibit good at short focal length. 此外,投影镜头亦可同时藉由满足0.45< |f4/(f5XNd4) I <1. 2,而可有效地矫正投影时所产生的色差进而可提供质量较佳的投影画面。 Further, by the projection lens while also satisfying 0.45 <|. F4 / (f5XNd4) I <1 2, and can effectively correct chromatic aberration generated by the projection in turn can provide better quality projection screen. 另外,投影镜头亦可满足0. 45 < dBF/f3 <1. 3,而获得较大的系统光圈,即较小的孔径数值(F number)。 Further, the projection lens may satisfy 0. 45 <dBF / f3 <1. 3, and a larger aperture system, i.e., the smaller the numerical aperture (F number). 再者,亦可通过适当选择第一透镜、第二透镜、第三透镜、第四透镜与第五透镜至少其四各有一表面为非球面,而可改善投影镜头于投影时可能产生的彗差(Coma)、像散(Astigmatism)或畸变(Distortion)的问题。 Further, also by appropriate selection of the first lens, second lens, third lens, fourth lens and the fifth lens at least one surface of each of its four aspherical, but may improve the coma in the projection lens when the projection difference may be generated (Coma), astigmatism (astigmatism) or distortion (distortion) problems.

[0070] 以上所述者,仅为本发明的优选实施例而已,当不能以此限定本发明实施的范围,即大凡依本发明权利要求及发明说明内容所作的简单的等效变化与修饰,皆仍属本发明专利涵盖的范围内。 [0070] The above are merely illustrate the preferred embodiments of the present invention, when not limit the scope of this embodiment of the present invention, i.e., almost all under this invention and the claims of the invention described simple modifications and equivalent content made, patents are still within the scope of the present invention is encompassed. 另外,本发明的任一实施例或权利要求不须达成本发明所揭露的全部目的或优点或特点。 Further, the present invention according to any one embodiment or embodiments as claimed in claim is not intended to be exhaustive or advantages or features disclosed by the present invention. 此外,摘要部分和标题仅是用来辅助专利文件搜寻之用,并非用来限制本发明的权利范围。 Further, the abstract and the headings are merely used to aid in searches of patent files, and is not intended to limit the scope of the present invention. 另外,说明书中提及的第一透镜、第二透镜...等用语,仅用以表示元件的名称,并非用来限制元件数量上的上限或下限。 Further, the first lens mentioned in the specification, terms such as ... the second lens, only to indicate the name of the element, not intended to limit the upper or lower limit on the number of elements.

Claims (10)

  1. 1. 一种投影镜头,包括由放大侧至缩小侧依序排列的第一透镜、第二透镜、第三透镜、第四透镜与第五透镜,所述第一透镜、所述第二透镜、所述第三透镜、所述第四透镜与所述第五透镜的屈光度分别为负、负、正、负、正,所述第四透镜的屈光度大于所述第一透镜与所述第二透镜的屈光度, 其中所述第四透镜的折射率为Nd4且焦距为f4,所述第五透镜的焦距为f5,所述投影镜头满足0.45 < |f4/(f5XNd4) I <1.2。 A projection lens, a zoom lens comprising a first side to the reduction side sequentially arranged, the second lens, third lens, fourth lens and the fifth lens, the first lens, the second lens, the third lens, the fourth lens and the fifth lens diopter are negative, negative, positive, negative, positive, refractive power of the fourth lens is greater than the first lens and the second lens diopter, wherein the refractive index of the fourth lens and the focal length is Nd4 f4, the focal length of the fifth lens is f5, the projection lens satisfies 0.45 <| f4 / (f5XNd4) I <1.2.
  2. 2.如权利要求1所述的投影镜头,其中所述第三透镜的焦距为f3,所述第五透镜靠近所述缩小侧的表面至图像处理元件之间的距离为dBF,所述投影镜头满足0. 45 < dBF/f3<1. 3。 The projection lens according to claim 1, wherein a focal length of the third lens is f3, the fifth lens closer to the surface to reduce the distance between the image side is dBF processing element, the projection lens satisfies 0. 45 <dBF / f3 <1. 3.
  3. 3.如权利要求1所述的投影镜头,其中所述第一透镜与所述第二透镜至少各有一表面为非球面。 The projection lens as claimed in claim 1, wherein the first lens and the second lens each have at least one aspherical surface.
  4. 4.如权利要求1所述的投影镜头,其中所述第三透镜、所述第四透镜与所述第五透镜至少其二各有一表面为非球面。 The projection lens as claimed in claim 1, wherein said third lens, the fourth lens and the fifth lens have at least a Second aspheric surface.
  5. 5.如权利要求1所述的投影镜头,其中所述第一透镜与所述第二透镜各为凸面朝向所述放大侧的凸凹透镜,所述第三透镜为双凸透镜,所述第四透镜为双凹透镜,所述第五透镜为双凸透镜。 5. The projection lens according to claim 1, wherein the first lens and the second lens is a convex surface facing each of said convex-concave lens is an enlarged side, the third lens is a biconvex lens, the fourth lens a biconcave lens, the fifth lens is a biconvex lens.
  6. 6.如权利要求5所述的投影镜头,其中所述第一透镜、所述第二透镜、所述第三透镜与所述第四透镜的各表面为非球面。 6. The projection lens as claimed in claim 5, wherein said first lens, said second lens, each surface of the third lens and the fourth lens is aspherical.
  7. 7.如权利要求1所述的投影镜头,其中所述第一透镜为凸面朝向所述放大侧的凸凹透镜,所述第二透镜为双凹透镜,所述第三透镜为双凸透镜,所述第四透镜为双凹透镜,所述第五透镜为双凸透镜。 The projection lens according to claim 1, wherein said first lens is a meniscus lens convex toward the enlarged side of the second lens is a biconcave lens, the third lens is a biconvex lens, the second four lens is a biconcave lens, the fifth lens is a biconvex lens.
  8. 8.如权利要求7所述的投影镜头,其中所述第一透镜、所述第二透镜、所述第四透镜与所述第五透镜的各表面为非球面。 8. The projection lens according to claim 7, wherein said first lens, said second lens, each surface of the fourth lens and the fifth lens are aspherical.
  9. 9.如权利要求1所述的投影镜头,还包括: 孔径光阑,配置于所述第三透镜与第四透镜之间。 9. The projection lens according to claim 1, further comprising: an aperture stop disposed between the third lens and the fourth lens.
  10. 10.如权利要求1所述的投影镜头,其中所述投影镜头的数值孔径落在2. 2与2. 0之间。 10. The projection lens according to claim 1, wherein the numerical aperture of the projection lens falling between 2.2 and 2.0.
CN 201110325104 2011-10-24 2011-10-24 The projection lens CN103064175B (en)

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