TWI774408B

TWI774408B - Wide-angle lens assembly

Info

Publication number: TWI774408B
Application number: TW110120312A
Authority: TW
Inventors: 許榮順
Original assignee: 大陸商信泰光學（深圳）有限公司; 亞洲光學股份有限公司
Priority date: 2021-06-03
Filing date: 2021-06-03
Publication date: 2022-08-11
Also published as: TW202248708A

Abstract

The present invention provides a wide-angle lens assembly includes, in an order from an object side to an image side along an optical axis, a first lens element with negative refractive power, having an image-side surface being concave; a second lens element with negative refractive power, having an image-side surface being concave; a third lens element with negative refractive power; a fourth lens element with positive refractive power; a fifth lens element with a refractive power; a sixth lens element with positive refractive power, having an object-side surface being convex and an image-side surface being convex; a seventh lens element with negative refractive power; and an eighth lens element with positive refractive power, having an object-side surface being convex and an image-side surface being convex. The wide-angle lens assembly is characterized by small size, excellent resolution and great environmental tolerance.

Description

廣角鏡頭(三十三)Wide-angle lens (33)

本發明是關於一種光學元件，特別有關一種廣角鏡頭。The present invention relates to an optical element, in particular to a wide-angle lens.

近年來，取像設備得到了廣泛的應用，隨著不同的應用需求，規格也越來越多元化。特別是，當前市場對具備大視場角度的廣角鏡頭的需求有持續增加的趨勢。此外，小型化、解像力良好也是這類鏡頭發展的方向。另一方面，為使廣角鏡頭在不同環境下能夠有一致的表現，在高低溫環境下確保高性能，抗環境變化的廣角鏡頭是不可或缺的。因此，當前市場亟需一種具備大視場角度、小型化、高成像品質及環境耐受性高的鏡頭。這類鏡頭的應用領域例如車載鏡頭、監視器、空拍機、運動攝影器材、頭戴式攝像器及各式配備鏡頭的電子產品等。In recent years, imaging equipment has been widely used, and with different application requirements, the specifications have become more and more diversified. In particular, the current market demand for wide-angle lenses with a large field of view continues to increase. In addition, miniaturization and good resolution are also the development directions of this type of lens. On the other hand, in order for wide-angle lenses to have consistent performance in different environments and to ensure high performance in high and low temperature environments, wide-angle lenses that are resistant to environmental changes are indispensable. Therefore, there is an urgent need for a lens with a large field of view, miniaturization, high imaging quality and high environmental tolerance. The application fields of this type of lens include vehicle lens, monitor, aerial camera, sports photography equipment, head-mounted camera and various electronic products equipped with lens, etc.

有鑑於此，本發明之主要目的在於提供一種廣角鏡頭，其具有小型化、解像力良好及環境耐受性佳等特性。In view of this, the main object of the present invention is to provide a wide-angle lens, which has the characteristics of miniaturization, good resolution, and good environmental tolerance.

本發明一方面提供一種廣角鏡頭，其從物側至像側在光軸上依序包含：一第一透鏡，其為具負屈光度的透鏡，其像側表面為凹面；一第二透鏡，其為具負屈光度的透鏡，其像側表面為凹面；一第三透鏡，其為具負屈光度的透鏡；一第四透鏡，其為具正屈光度的透鏡；一第五透鏡，其為具屈光度的透鏡；一第六透鏡，其為具正屈光度的透鏡，其物側表面為凸面，像側表面為凸面；一第七透鏡，其為具負屈光度的透鏡；以及一第八透鏡，其為具正屈光度的透鏡，其物側表面為凸面，像側表面為凸面，其中該廣角鏡頭滿足以下條件式：21.02≦f4+f6≦26.89，其中f4為該第四透鏡的有效焦距，f6為該第六透鏡的有效焦距。One aspect of the present invention provides a wide-angle lens, which sequentially includes on the optical axis from the object side to the image side: a first lens, which is a lens with negative refractive power, and whose image side surface is concave; a second lens, which is A lens with negative power, whose image-side surface is concave; a third lens, which is a lens with negative power; a fourth lens, which is a lens with positive power; a fifth lens, which is a lens with power ; a sixth lens, which is a lens with positive refractive power, the object-side surface is convex, and the image-side surface is convex; a seventh lens, which is a lens with negative refractive power; and an eighth lens, which is a positive A lens with diopter, its object-side surface is convex, and its image-side surface is convex, wherein the wide-angle lens satisfies the following conditional formula: 21.02≦f4+f6≦26.89, where f4 is the effective focal length of the fourth lens, and f6 is the sixth lens effective focal length.

本發明另一方面提供一種廣角鏡頭，其從物側至像側在光軸上依序包含：一第一透鏡，其為具負屈光度的透鏡，其像側表面為凹面；一第二透鏡，其為具負屈光度的透鏡，其像側表面為凹面；一第三透鏡，其為具負屈光度的透鏡；一第四透鏡，其為具正屈光度的透鏡；一第五透鏡，其為具屈光度的透鏡；一第六透鏡，其為具正屈光度的透鏡，其物側表面為凸面，像側表面為凸面；一第七透鏡，其為具負屈光度的透鏡；以及一第八透鏡，其為具正屈光度的透鏡，其物側表面為凸面，像側表面為凸面，其中該廣角鏡頭滿足以下條件式：18.66≦f4+f8≦23.13，其中f4為該第四透鏡的有效焦距，f8為該第八透鏡的有效焦距。Another aspect of the present invention provides a wide-angle lens, which sequentially includes on the optical axis from the object side to the image side: a first lens, which is a lens with negative refractive power, and whose image side surface is concave; a second lens, which It is a lens with negative power, and its image-side surface is concave; a third lens, which is a lens with negative power; a fourth lens, which is a lens with positive power; a fifth lens, which is a lens with power lens; a sixth lens, which is a lens with positive refractive power, the object-side surface is convex, and the image-side surface is convex; a seventh lens, which is a lens with negative refractive power; and an eighth lens, which is a lens with negative refractive power The lens with positive diopter has a convex surface on the object side and a convex surface on the image side, wherein the wide-angle lens satisfies the following conditional formula: 18.66≦f4+f8≦23.13, where f4 is the effective focal length of the fourth lens, and f8 is the eighth lens The effective focal length of the lens.

本發明之廣角鏡頭中，該第三透鏡的物側表面為凹面，該第五透鏡的像側表面為凸面，該第七透鏡的像側表面為凹面。In the wide-angle lens of the present invention, the object-side surface of the third lens is concave, the image-side surface of the fifth lens is convex, and the image-side surface of the seventh lens is concave.

本發明之廣角鏡頭中，該第三透鏡的像側表面為凹面，該第七透鏡的物側表面為凸面。In the wide-angle lens of the present invention, the image-side surface of the third lens is concave, and the object-side surface of the seventh lens is convex.

本發明之廣角鏡頭中，該第三透鏡的像側表面為凸面，該第五透鏡的物側表面為凹面。In the wide-angle lens of the present invention, the image-side surface of the third lens is convex, and the object-side surface of the fifth lens is concave.

本發明之廣角鏡頭中，該第三透鏡的像側表面為凸面，該第七透鏡的物側表面為凹面。In the wide-angle lens of the present invention, the image-side surface of the third lens is convex, and the object-side surface of the seventh lens is concave.

本發明之廣角鏡頭中，該第五透鏡的物側表面為凸面。In the wide-angle lens of the present invention, the object-side surface of the fifth lens is convex.

本發明之廣角鏡頭還包括一光圈，設置於該第一透鏡至該第八透鏡中兩相鄰透鏡之間，其中沿著該光圈往該物側之方向設置的透鏡為位於該光圈前的透鏡，沿著該光圈往該像側之方向設置的透鏡為位於該光圈後的透鏡，其中位於該光圈前的透鏡包括至少一枚透鏡，位於該光圈後的透鏡包括至少一枚透鏡。The wide-angle lens of the present invention further comprises an aperture, which is disposed between two adjacent lenses in the first lens to the eighth lens, wherein the lens disposed along the aperture toward the object side is the lens located in front of the aperture, The lens disposed along the direction of the aperture to the image side is the lens behind the aperture, wherein the lens in front of the aperture includes at least one lens, and the lens behind the aperture includes at least one lens.

本發明之廣角鏡頭中，該廣角鏡頭至少滿足以下其中一條件式：-0.64≦(G7R2+G6R2)/GAR1≦-0.03；-5≦(GBR1+G6R2)/G7R2≦16；-50≦GBR2+G3R2≦28；-0.72≦G7R2/VB≦2.15；其中GAR1為位於該光圈前第一枚透鏡之物側表面的曲率半徑，GBR1為位於該光圈後第一枚透鏡之物側表面的曲率半徑，GBR2為位於該光圈後第一枚透鏡之像側表面的曲率半徑，G3R2為該第三透鏡之像側表面的曲率半徑，G6R2為該第六透鏡之像側表面的曲率半徑，G7R2為該第七透鏡之像側表面的曲率半徑，VB為位於該光圈後第一枚透鏡的阿貝係數。In the wide-angle lens of the present invention, the wide-angle lens satisfies at least one of the following conditions: -0.64≦(G7R2+G6R2)/GAR1≦-0.03; -5≦(GBR1+G6R2)/G7R2≦16; -50≦GBR2+G3R2≦ 28; -0.72≦G7R2/VB≦2.15; where GAR1 is the curvature radius of the object-side surface of the first lens located in front of the aperture, GBR1 is the curvature radius of the object-side surface of the first lens located behind the aperture, and GBR2 is The curvature radius of the image side surface of the first lens behind the aperture, G3R2 is the curvature radius of the image side surface of the third lens, G6R2 is the curvature radius of the sixth lens image side surface, G7R2 is the seventh lens The radius of curvature of the image side surface, VB is the Abbe coefficient of the first lens behind the aperture.

本發明之廣角鏡頭中，該廣角鏡頭至少滿足以下其中一條件式：-25.66≦f4+f3≦-5.19；-0.06≦(G7R1/G3R2)/G5R1≦0.12；-1.29≦(G7R2-G6R2)/f3≦-0.62；其中f3為該第三透鏡的有效焦距，f4為該第四透鏡的有效焦距，G3R2為該第三透鏡之像側表面的曲率半徑，G5R1為該第五透鏡之物側表面的曲率半徑，G6R2為該第六透鏡之像側表面的曲率半徑，G7R1為該第七透鏡之物側表面的曲率半徑，G7R2為該第七透鏡之像側表面的曲率半徑。In the wide-angle lens of the present invention, the wide-angle lens satisfies at least one of the following conditions: -25.66≦f4+f3≦-5.19;-0.06≦(G7R1/G3R2)/G5R1≦0.12;-1.29≦(G7R2-G6R2)/f3≦ -0.62; where f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, G3R2 is the radius of curvature of the image-side surface of the third lens, and G5R1 is the curvature of the object-side surface of the fifth lens Radius, G6R2 is the curvature radius of the image side surface of the sixth lens, G7R1 is the curvature radius of the seventh lens object side surface, G7R2 is the curvature radius of the seventh lens image side surface.

本發明之廣角鏡頭更包含一第九透鏡，設置於該第一透鏡與該第三透鏡之間，該第九透鏡具有負屈光度，其物側表面為凸面，像側表面為凹面。The wide-angle lens of the present invention further includes a ninth lens disposed between the first lens and the third lens, the ninth lens has negative refractive power, the object side surface is convex, and the image side surface is concave.

本發明的廣角鏡頭具有小型化、解像力良好及環境耐受性佳等特性，並且具有像面彎曲小及倍率色差表現佳等優點。是以，本發明的廣角鏡頭滿足高成像品質的需求。The wide-angle lens of the present invention has the characteristics of miniaturization, good resolution, good environmental tolerance and the like, and has the advantages of small image plane curvature and good performance of magnification and chromatic aberration. Therefore, the wide-angle lens of the present invention meets the requirement of high imaging quality.

為讓本發明之上述及其他目的、特徵、優點能更明顯易懂，下文將特舉本發明較佳實施例，並配合所附圖式，作詳細說明如下。In order to make the above-mentioned and other objects, features and advantages of the present invention more obvious and easy to understand, the preferred embodiments of the present invention will be exemplified below and described in detail in conjunction with the accompanying drawings.

本發明提供一種廣角鏡頭，其具有像面彎曲小及倍率色差表現佳等優點，可以滿足大視場角度、小型化、高成像品質及環境耐受性高的需求，可應用於諸如車載鏡頭、監視器、空拍機、運動攝影器材、頭戴式攝像器及各式配備鏡頭的電子產品等。The invention provides a wide-angle lens, which has the advantages of small image plane curvature and good magnification chromatic aberration performance, etc., can meet the requirements of large field of view angle, miniaturization, high imaging quality and high environmental tolerance, and can be applied to such as vehicle lens, surveillance Cameras, aerial cameras, sports photography equipment, head-mounted cameras and various electronic products equipped with lenses, etc.

圖1顯示依據本發明的廣角鏡頭的示意圖。如圖1所示，本發明的廣角鏡頭包含兩個透鏡群，即位於光圈STO前面的第一透鏡群和位於光圈STO後面的第二透鏡群。在一個示範性的例子中，第一透鏡群沿著光軸OA從物側至像側依序包括第一透鏡L1、第二透鏡L2、第三透鏡L3及第四透鏡L4，第二透鏡群沿著光軸OA從物側至像側依序包括第五透鏡L5、第六透鏡L6、第七透鏡L7及第八透鏡L8，但不限於此，第一透鏡群和第二透鏡群也可分別包括其他數量的透鏡，例如第一透鏡群包括五枚透鏡、第二透鏡群包括四枚透鏡。來自物側的光線通過第一透鏡群、光圈STO和第二透鏡群後，成像於成像平面IMA上。第二透鏡群和成像平面IMA之間可設置一保護玻璃（未圖示），該保護玻璃可為一濾光片。在一個示範性的例子中，該廣角鏡頭具有單一焦點，為一定焦光學系統。FIG. 1 shows a schematic diagram of a wide-angle lens according to the present invention. As shown in FIG. 1 , the wide-angle lens of the present invention includes two lens groups, namely, a first lens group located in front of the aperture STO and a second lens group located behind the aperture STO. In an exemplary example, the first lens group includes a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4 in sequence from the object side to the image side along the optical axis OA, and the second lens group It includes a fifth lens L5, a sixth lens L6, a seventh lens L7 and an eighth lens L8 in sequence from the object side to the image side along the optical axis OA, but is not limited to this, the first lens group and the second lens group may also be Other numbers of lenses are respectively included, for example, the first lens group includes five lenses, and the second lens group includes four lenses. The light from the object side is imaged on the imaging plane IMA after passing through the first lens group, the aperture STO and the second lens group. A protective glass (not shown) can be disposed between the second lens group and the imaging plane IMA, and the protective glass can be a filter. In an exemplary example, the wide-angle lens has a single focus, which is a fixed-focus optical system.

在透鏡組成方面，第一透鏡群中，第一透鏡L1為具負屈光度的透鏡，例如彎月型透鏡，第一透鏡L1的像側表面為凹面；第二透鏡L2為具負屈光度的透鏡，例如彎月型透鏡，其像側表面為凹面；第三透鏡L3為具負屈光度的透鏡，例如雙凹透鏡或彎月型透鏡；第四透鏡L4為具正屈光度的透鏡，例如雙凸透鏡。第二透鏡群中，第五透鏡L5為具屈光度的透鏡，例如具正屈光度的透鏡（如雙凸透鏡或彎月型透鏡）；第六透鏡L6為具正屈光度的透鏡，例如雙凸透鏡，第六透鏡L6的物側表面為凸面，像側表面為凸面；第七透鏡L7為具負屈光度的透鏡，例如雙凹透鏡或彎月型透鏡；第八透鏡L8為具正屈光度的透鏡，例如雙凸透鏡，第八透鏡L8的物側表面為凸面，像側表面為凸面。本發明的廣角鏡頭中，第一至第八透鏡L1~L8的屈光度依次為負、負、負、正、正、正、負、正。另外，可於第一透鏡群的第一透鏡L1與第三透鏡L3之間（具體例如第一透鏡L1與第二透鏡L2之間）設置一第九透鏡（見第四實施例），使得廣角鏡頭沿左至右的屈光度依次為負、負、負、負、正、正、正、負、正。此一光學鏡頭的視場角度可達222度，鏡頭總長可設計為約20~35mm左右，滿足大視場角度、小型化的需求。另外，大部分或全部的透鏡可採用抗溫度變化的玻璃材質，環境耐受性佳。In terms of lens composition, in the first lens group, the first lens L1 is a lens with negative refractive power, such as a meniscus lens, and the image-side surface of the first lens L1 is concave; the second lens L2 is a lens with negative refractive power, For example, a meniscus lens has a concave image-side surface; the third lens L3 is a lens with negative refractive power, such as a biconcave lens or a meniscus lens; the fourth lens L4 is a lens with positive refractive power, such as a biconvex lens. In the second lens group, the fifth lens L5 is a lens with dioptric power, such as a lens with positive refractive power (such as a biconvex lens or a meniscus lens); the sixth lens L6 is a lens with positive refractive power, such as a biconvex lens, the sixth lens The object-side surface of the lens L6 is convex, and the image-side surface is convex; the seventh lens L7 is a lens with negative refractive power, such as a biconcave lens or a meniscus lens; the eighth lens L8 is a lens with positive refractive power, such as a biconvex lens, The object-side surface of the eighth lens L8 is convex, and the image-side surface is convex. In the wide-angle lens of the present invention, the dioptric powers of the first to eighth lenses L1 to L8 are negative, negative, negative, positive, positive, positive, negative, and positive in sequence. In addition, a ninth lens (see the fourth embodiment) can be arranged between the first lens L1 and the third lens L3 of the first lens group (specifically, for example, between the first lens L1 and the second lens L2), so that the wide-angle lens Diopter from left to right is negative, negative, negative, negative, positive, positive, positive, negative, positive. The field of view of this optical lens can reach 222 degrees, and the total length of the lens can be designed to be about 20~35mm, which meets the needs of large field of view and miniaturization. In addition, most or all of the lenses can be made of glass that is resistant to temperature changes and has good environmental tolerance.

為使本發明之廣角鏡頭能夠保持良好的光學性能，本發明之廣角鏡頭可以進一步滿足以下條件式(1)： 21.02≦f4+f6≦26.89，其中f4為該第四透鏡的有效焦距，f6為該第六透鏡的有效焦距。條件式(1)可控制第四透鏡L4的焦距及第六透鏡L6的焦距，進而匯聚光線，有助於縮小成像平面IMA上的主光線角度，並提升週邊光量。符合條件式(1)的廣角鏡頭有良好的成像表現，成像品質高。 In order to enable the wide-angle lens of the present invention to maintain good optical performance, the wide-angle lens of the present invention can further satisfy the following conditional formula (1): 21.02≦f4+f6≦26.89, Wherein f4 is the effective focal length of the fourth lens, and f6 is the effective focal length of the sixth lens. Conditional formula (1) can control the focal length of the fourth lens L4 and the focal length of the sixth lens L6, thereby converging the light, which helps to reduce the angle of the chief ray on the imaging plane IMA and increase the amount of peripheral light. The wide-angle lens that meets the conditional formula (1) has good imaging performance and high imaging quality.

為使本發明之廣角鏡頭能夠保持良好的光學性能，本發明之廣角鏡頭可以進一步滿足以下條件式(2)： 18.66≦f4+f8≦23.13，其中f4為該第四透鏡的有效焦距，f8為該第八透鏡的有效焦距。條件式(2)可控制第四透鏡L4的焦距及第八透鏡L8的焦距，進而匯聚光線，有助於縮小成像平面IMA上的主光線角度，並提升週邊光量。符合條件式(2)的廣角鏡頭有良好的成像表現，成像品質高。 In order to enable the wide-angle lens of the present invention to maintain good optical performance, the wide-angle lens of the present invention can further satisfy the following conditional formula (2): 18.66≦f4+f8≦23.13, Wherein f4 is the effective focal length of the fourth lens, and f8 is the effective focal length of the eighth lens. Conditional formula (2) can control the focal length of the fourth lens L4 and the focal length of the eighth lens L8, thereby converging the light, which helps to reduce the angle of the chief ray on the imaging plane IMA and increase the amount of peripheral light. The wide-angle lens that meets the conditional formula (2) has good imaging performance and high imaging quality.

於一實施例中，第一透鏡L1的物側表面及第二透鏡L2的物側表面皆為凸面。第一透鏡L1設計為具負屈折力，且其物側表面為凸面，有助於形成反焦透鏡結構（Retro-Focus），使大視角的光線能夠進入此光學系統。第二透鏡L2設計為具負屈折力，可分攤第一透鏡L1之負屈折力，且其物側表面為凸面，有利於修正像差。In one embodiment, the object-side surface of the first lens L1 and the object-side surface of the second lens L2 are both convex surfaces. The first lens L1 is designed to have a negative refractive power, and its object-side surface is convex, which helps to form a retro-focus lens structure, so that light with a large viewing angle can enter the optical system. The second lens L2 is designed to have a negative refractive power, which can share the negative refractive power of the first lens L1, and its object-side surface is convex, which is beneficial for correcting aberrations.

於一實施例中，第四透鏡L4的物側表面及像側表面皆為凸面。也即，第四透鏡L4為雙凸透鏡，可提供系統主要的光線匯聚能力，有助於縮短鏡頭總長。In one embodiment, both the object-side surface and the image-side surface of the fourth lens L4 are convex. That is, the fourth lens L4 is a biconvex lens, which can provide the main light-converging ability of the system and help to shorten the total length of the lens.

於一實施例中，第三透鏡L3的物側表面為凹面，第五透鏡L5的像側表面為凸面，第七透鏡L7的像側表面為凹面。第三透鏡L3設計為具負屈折力，且其物側表面為凹面，有助於緩和大視角光線。第五透鏡L5設計為正屈折力，且其像側表面為凸面，有助於加強廣角系統焦距短的特性。於一實施例中，第三透鏡L3為雙凹透鏡，第七透鏡L7為彎月型透鏡，第三透鏡L3的像側表面為凹面，第七透鏡L7的物側表面為凸面。於一實施例中，第三透鏡L3為具負屈折力的彎月型透鏡，第五透鏡L5為具正屈折力的彎月型透鏡，第三透鏡L3的像側表面為凸面，第五透鏡L5的物側表面為凹面。於一實施例中，第三透鏡L3為彎月型透鏡，第七透鏡L7為雙凹透鏡，第三透鏡L3的像側表面為凸面，第七透鏡L7的物側表面為凹面。於一實施例中，第五透鏡L5為雙凸透鏡，第五透鏡L5的物側表面為凸面。In one embodiment, the object-side surface of the third lens L3 is concave, the image-side surface of the fifth lens L5 is convex, and the image-side surface of the seventh lens L7 is concave. The third lens L3 is designed to have a negative refractive power, and its object-side surface is concave, which helps to relieve light from a large viewing angle. The fifth lens L5 is designed to have a positive refractive power, and its image-side surface is convex, which helps to enhance the short focal length of the wide-angle system. In one embodiment, the third lens L3 is a biconcave lens, the seventh lens L7 is a meniscus lens, the image-side surface of the third lens L3 is concave, and the object-side surface of the seventh lens L7 is convex. In one embodiment, the third lens L3 is a meniscus lens with negative refractive power, the fifth lens L5 is a meniscus lens with positive refractive power, the image-side surface of the third lens L3 is a convex surface, and the fifth lens The object-side surface of L5 is concave. In one embodiment, the third lens L3 is a meniscus lens, the seventh lens L7 is a biconcave lens, the image-side surface of the third lens L3 is convex, and the object-side surface of the seventh lens L7 is concave. In one embodiment, the fifth lens L5 is a biconvex lens, and the object-side surface of the fifth lens L5 is a convex surface.

於一實施例中，本發明的廣角鏡頭可以滿足以下條件式(3)，以進一步維持光學性能： -25.66≦f4+f3≦-5.19，其中f3為該第三透鏡L3的有效焦距，f4為該第四透鏡L4的有效焦距。條件式(3)可控制第三透鏡L3及第四透鏡L4的焦距，有助於提高成像品質。滿足條件(3)之廣角鏡頭的像面彎曲程度小，像場投影在成像平面時不會過度失真，且倍率色差表現佳，倍率提高不至於過度影響色偏，符合該範圍則具有最佳消色差及抗像面扭曲的條件。 In one embodiment, the wide-angle lens of the present invention can satisfy the following conditional formula (3) to further maintain the optical performance: -25.66≦f4+f3≦-5.19, Wherein f3 is the effective focal length of the third lens L3, and f4 is the effective focal length of the fourth lens L4. Conditional expression (3) can control the focal lengths of the third lens L3 and the fourth lens L4, which helps to improve the imaging quality. The wide-angle lens that satisfies the condition (3) has a small degree of curvature of the image surface, the image field will not be excessively distorted when projected on the imaging plane, and the magnification chromatic aberration performance is good, and the increase of the magnification will not excessively affect the color shift, and within this range, it has the best achromatic aberration and the condition of resisting image plane distortion.

於一實施例中，本發明的廣角鏡頭可以滿足以下條件式(4)，以進一步維持光學性能： -1.29≦(G7R2-G6R2)/f3≦-0.62， In one embodiment, the wide-angle lens of the present invention can satisfy the following conditional formula (4) to further maintain the optical performance: -1.29≦(G7R2-G6R2)/f3≦-0.62,

其中f3為該第三透鏡L3的有效焦距，G6R2為該第六透鏡L6之像側表面的曲率半徑，G7R2為該第七透鏡L7之像側表面的曲率半徑。條件式(4)可控制第三透鏡L3的焦距以及第六透鏡L6及第七透鏡L7之像側表面的曲率半徑，有助於提高成像品質。滿足條件(4)之廣角鏡頭的像面彎曲程度小，像場投影在成像平面IMA時不會過度失真，且倍率色差表現佳，倍率提高不至於過度影響色偏，符合該範圍則具有最佳消色差及抗像面扭曲的條件。於一實施例中，本發明的廣角鏡頭可以滿足以下條件式(5)，以進一步維持光學性能： -0.06≦(G7R1/G3R2)/G5R1≦0.12，其中G3R2為該第三透鏡L3之像側表面的曲率半徑，G5R1為該第五透鏡L5之物側表面的曲率半徑，G7R1為該第七透鏡L7之物側表面的曲率半徑。藉此，可進一步修正倍率色差及畸變，提升成像品質，符合該範圍則具有最佳消色差及抗像面扭曲的條件。 where f3 is the effective focal length of the third lens L3, G6R2 is the radius of curvature of the image-side surface of the sixth lens L6, and G7R2 is the radius of curvature of the image-side surface of the seventh lens L7. Conditional formula (4) can control the focal length of the third lens L3 and the curvature radii of the image-side surfaces of the sixth lens L6 and the seventh lens L7, which is helpful to improve the imaging quality. The wide-angle lens that satisfies the condition (4) has a small degree of curvature of the image surface, the image field will not be excessively distorted when projected on the imaging plane IMA, and the magnification chromatic aberration performance is good. Chromatic aberration and anti-image distortion conditions. In one embodiment, the wide-angle lens of the present invention can satisfy the following conditional formula (5) to further maintain the optical performance: -0.06≦(G7R1/G3R2)/G5R1≦0.12, Wherein G3R2 is the curvature radius of the image side surface of the third lens L3, G5R1 is the curvature radius of the object side surface of the fifth lens L5, G7R1 is the curvature radius of the seventh lens L7 object side surface. In this way, the chromatic aberration and distortion of magnification can be further corrected, and the image quality can be improved, and within this range, it has the best achromatic and anti-image distortion conditions.

於一實施例中，光圈STO設置於該第一至第八透鏡L1~L8中兩相鄰透鏡之間。本發明中，沿著光圈STO往物側之方向設置的透鏡為定義為位於光圈STO前的透鏡，即為第一透鏡群中的透鏡，而沿著光圈STO往像側之方向設置的透鏡定義為位於光圈STO後的透鏡，即為第二透鏡群中的透鏡。第一透鏡群和第二透鏡群分別包括至少一枚透鏡，也即位於光圈STO前的透鏡包括至少一枚透鏡，位於光圈STO後的透鏡包括至少一枚透鏡。In one embodiment, the aperture STO is disposed between two adjacent lenses among the first to eighth lenses L1 ˜ L8 . In the present invention, the lens arranged along the direction of the aperture STO to the object side is defined as the lens located in front of the aperture STO, that is, the lens in the first lens group, and the lens arranged along the direction of the aperture STO to the image side is defined as is the lens behind the aperture STO, that is, the lens in the second lens group. The first lens group and the second lens group respectively include at least one lens, that is, the lens located in front of the aperture STO includes at least one lens, and the lens located behind the aperture STO includes at least one lens.

於一實施例中，本發明的廣角鏡頭可以滿足以下條件式(6)，以進一步維持光學性能： -5≦(GBR1+G6R2)/G7R2≦16，其中GBR1為位於光圈STO後第一枚透鏡（例如圖1中的第五透鏡L5）之物側表面的曲率半徑，G6R2為該第六透鏡L6之像側表面的曲率半徑，G7R2為該第七透鏡L7之像側表面的曲率半徑。藉此，可進一步修正像面彎曲，像場投影在成像平面IMA時不會過度失真，符合該範圍則具有最佳抗像面扭曲的條件。 In one embodiment, the wide-angle lens of the present invention can satisfy the following conditional formula (6) to further maintain the optical performance: -5≦(GBR1+G6R2)/G7R2≦16, Wherein GBR1 is the curvature radius of the object-side surface of the first lens (such as the fifth lens L5 in FIG. 1 ) after the aperture STO, G6R2 is the curvature radius of the image-side surface of the sixth lens L6, and G7R2 is the seventh The radius of curvature of the image-side surface of the lens L7. In this way, the curvature of the image surface can be further corrected, and the image field projection on the imaging plane IMA will not be overly distorted, and within this range, it has the optimal anti-image surface distortion condition.

於一實施例中，本發明的廣角鏡頭可以滿足以下條件式(7)，以進一步維持光學性能： -0.64≦(G7R2+G6R2)/GAR1≦-0.03，其中GAR1為位於光圈STO前第一枚透鏡（例如圖1中的第四透鏡L4）之物側表面的曲率半徑，G6R2為該第六透鏡L6之像側表面的曲率半徑，G7R2為該第七透鏡L7之像側表面的曲率半徑。藉此，可進一步修正倍率色差及畸變，提升成像品質，符合該範圍則具有最佳消色差及抗像面扭曲的條件。 In one embodiment, the wide-angle lens of the present invention can satisfy the following conditional formula (7) to further maintain the optical performance: -0.64≦(G7R2+G6R2)/GAR1≦-0.03, Among them, GAR1 is the curvature radius of the object-side surface of the first lens (for example, the fourth lens L4 in FIG. 1 ) before the aperture STO, G6R2 is the curvature radius of the image-side surface of the sixth lens L6, and G7R2 is the seventh The radius of curvature of the image-side surface of the lens L7. In this way, the chromatic aberration and distortion of magnification can be further corrected, and the image quality can be improved, and within this range, it has the best achromatic and anti-image distortion conditions.

於一實施例中，本發明的廣角鏡頭可以滿足以下條件式(8)，以進一步維持光學性能： -0.72≦G7R2/VB≦2.15，其中VB為位於光圈STO後第一枚透鏡（例如圖1中的第五透鏡L5）的阿貝係數，G7R2為該第七透鏡L7之像側表面的曲率半徑。藉此，可修正縱向色差，符合該範圍則具有最佳消色差條件。 In one embodiment, the wide-angle lens of the present invention can satisfy the following conditional formula (8) to further maintain the optical performance: -0.72≦G7R2/VB≦2.15, VB is the Abbe coefficient of the first lens (eg, the fifth lens L5 in FIG. 1 ) behind the aperture STO, and G7R2 is the curvature radius of the image-side surface of the seventh lens L7 . In this way, longitudinal chromatic aberration can be corrected, and within this range, there is an optimal achromatic condition.

於一實施例中，本發明的廣角鏡頭可以滿足以下條件式(9)，以進一步維持光學性能： -50≦GBR2+G3R2≦28，其中GBR2為位於該光圈後第一枚透鏡（例如圖1中的第五透鏡L5）之像側表面的曲率半徑，G3R2為該第三透鏡L3之像側表面的曲率半徑。藉此，可修正球面像差，符合該範圍則具有最佳球面像差表現。 In one embodiment, the wide-angle lens of the present invention can satisfy the following conditional formula (9) to further maintain the optical performance: -50≦GBR2+G3R2≦28, GBR2 is the curvature radius of the image-side surface of the first lens behind the aperture (eg, the fifth lens L5 in FIG. 1 ), and G3R2 is the curvature radius of the image-side surface of the third lens L3 . In this way, spherical aberration can be corrected, and the best spherical aberration performance can be obtained within this range.

於一實施例中，本發明的廣角鏡頭中第一透鏡群包括至少三枚以上的凹透鏡。例如，第一至第八透鏡L1~L8中有至少三枚以上的透鏡位於光圈STO前且為凹透鏡。藉此，有助於修正縱向色差。In one embodiment, the first lens group in the wide-angle lens of the present invention includes at least three or more concave lenses. For example, at least three or more of the first to eighth lenses L1 to L8 are located in front of the aperture STO and are concave lenses. This contributes to correction of vertical chromatic aberration.

於一實施例中，本發明的廣角鏡頭中第二透鏡群包括至少三枚以上的凸透鏡。第一至第八透鏡L1~L8中有至少三枚以上的透鏡位於光圈STO後且為凸透鏡。藉此，有助於修正球面像差。In one embodiment, the second lens group in the wide-angle lens of the present invention includes at least three or more convex lenses. At least three of the first to eighth lenses L1 to L8 are located behind the aperture STO and are convex lenses. This contributes to correction of spherical aberration.

於一實施例中，本發明的廣角鏡頭有至少一枚以上的透鏡為非球面透鏡。例如，第一至第八透鏡L1~L8中有至少一枚以上的透鏡為非球面透鏡。藉此，於滿足拍攝遠處影像的同時，有效控制該廣角鏡頭的總長。In one embodiment, at least one or more lenses of the wide-angle lens of the present invention are aspherical lenses. For example, at least one or more of the first to eighth lenses L1 to L8 are aspherical lenses. Thereby, the total length of the wide-angle lens can be effectively controlled while satisfying the requirement of shooting distant images.

本發明的廣角鏡頭中各透鏡L1~L8的物側表面及像側表面皆可為非球面表面，非球面表面可以獲得較多的控制變數，以減少像差。但是，某些透鏡亦可為塑膠鏡片，在成本降低的情況下同時保持優良的解像品質。當然，這些透鏡亦可以以塑膠或玻璃組成的複合透鏡來實現，複合透鏡為兩透鏡相互黏合，其間沒有空氣間隔。In the wide-angle lens of the present invention, the object-side surface and the image-side surface of each of the lenses L1 to L8 can be aspherical surfaces, and the aspherical surfaces can obtain more control variables to reduce aberrations. However, some lenses can also be plastic lenses, which can maintain excellent resolution quality at a reduced cost. Of course, these lenses can also be realized by a compound lens composed of plastic or glass. The compound lens is two lenses bonded to each other without an air space therebetween.

非球面透鏡之形狀可以下式表示：The shape of an aspheric lens can be expressed as follows:

其中D代表非球面透鏡在離透鏡中心軸的相對高度時的矢（Sag）量，C表示近軸曲率半徑倒數，H表示非球面透鏡在離透鏡中心軸的相對高度，K表示非球面透鏡的圓錐常數（Conic Constant），而E4~ E12四階以上之偶數階的非球面修正係數，而係數中E代表科學記號，如E-03表示10 ^-3。 Where D represents the sag (Sag) of the aspheric lens at the relative height from the central axis of the lens, C represents the inverse of the paraxial curvature radius, H represents the relative height of the aspheric lens from the central axis of the lens, and K represents the Conic Constant, and E4~E12 The even-numbered aspheric correction coefficient of the fourth order and above, and E in the coefficient represents the scientific notation, such as E-03 represents 10 ^-3 .

以下將舉具體實施例，對本發明之廣角鏡頭作進一步詳細說明。Specific embodiments will be given below to further describe the wide-angle lens of the present invention in detail.

第一實施例：First embodiment:

請參閱圖2A至圖2D，其中圖2A顯示依據本發明第一實施例的廣角鏡頭的示意圖，圖2B至圖2D分別依序為第一實施例的畸變、場曲及縱向色差圖，量測過程中使用的光波長為0.555um。請參閱圖2A，本發明第一實施例的廣角鏡頭中，位於光圈STO前的第一透鏡群為具四片透鏡（即L1~L4）的架構，位於光圈STO後的第二透鏡群亦為具四片透鏡（即L1~L4）的架構。第一透鏡群中，第一透鏡L1和第二透鏡L2皆為彎月型透鏡，具體為凸凹透鏡，亦即第一透鏡L1和第二透鏡L2的像側表面皆為凹面。第三透鏡L3為雙凹透鏡，第四透鏡L4為雙凸透鏡。第一透鏡群具有三枚凹透鏡，有助於修正縱向色差。第二透鏡群中，第五透鏡L5、第六透鏡L6及第八透鏡L8皆為雙凸透鏡，而第七透鏡L7為彎月型透鏡，具體為凸凹透鏡，亦即其像側表面為凹面。第三透鏡群具有三枚凸透鏡，有助於修正球面像差。Please refer to FIGS. 2A to 2D , wherein FIG. 2A shows a schematic diagram of a wide-angle lens according to a first embodiment of the present invention, and FIGS. 2B to 2D are diagrams of distortion, field curvature, and longitudinal chromatic aberration of the first embodiment, respectively, and the measurement process. The wavelength of light used in 0.555um. Referring to FIG. 2A , in the wide-angle lens according to the first embodiment of the present invention, the first lens group located in front of the aperture STO has a structure of four lenses (ie L1-L4), and the second lens group located behind the aperture STO also has a structure of four lenses (ie L1-L4). The structure of four lenses (ie L1~L4). In the first lens group, the first lens L1 and the second lens L2 are both meniscus lenses, specifically convex and concave lenses, that is, the image-side surfaces of the first lens L1 and the second lens L2 are both concave. The third lens L3 is a biconcave lens, and the fourth lens L4 is a biconvex lens. The first lens group has three concave lenses that help correct longitudinal chromatic aberration. In the second lens group, the fifth lens L5, the sixth lens L6 and the eighth lens L8 are all biconvex lenses, and the seventh lens L7 is a meniscus lens, specifically a convex-concave lens, that is, its image-side surface is concave. The third lens group has three convex lenses that help correct spherical aberration.

表一為該廣角鏡頭及各透鏡的相關參數表，表二為表一中非球面表面之相關參數表。從表二可知，本實施例中第四透鏡L4和第八透鏡L8為非球面透鏡。有效焦距=3.33mm 　　光圈值=1.842 鏡頭總長度=23.92mm 　　視場=180.16度表面序號曲率半徑(mm) 間距(mm) 折射率 Nd 阿貝係數 Vd 有效焦距(mm) S1 15.56 0.55 1.76 52.00 -10.87 S2 4.61 1.35 S3 6.34 0.47 1.60 70.00 -12.14 S4 3.37 3.11 S5 -6.85 0.57 1.45 90.00 -29.95 S6 33.03 0.09 S7 13.26 2.61 1.72 30.00 14.06 S8 -14.59 0.18 S9 Infinity 1.02 S10 128.15 1.76 1.46 90.00 13.42 S11 -5.52 0.07 S12 12.60 2.11 1.60 70.00 11.95 S13 -12.99 0.66 S14 193.88 0.60 2.00 18.00 -7.48 S15 7.43 0.85 S16 13.74 2.18 1.80 50.00 8.87 S17 -11.73 5.75 表一面號 K E4 E6 E8 E10 S7 9.64E-04 3.28E-05 2.38E-06 -3.4E-07 S8 2.10E-03 9.19E-05 -7.25E-06 8.53E-07 S16 -3.37E-04 1.53E-05 -3.23E-08 S17 1.883 1.62E-04 8.16E-06 2.60E-07 表二 Table 1 is a table of relevant parameters of the wide-angle lens and each lens, and Table 2 is a table of relevant parameters of the aspheric surface in Table 1. It can be known from Table 2 that in this embodiment, the fourth lens L4 and the eighth lens L8 are aspherical lenses. Effective focal length=3.33mm Aperture value = 1.842 Total length of lens = 23.92mm Field of view = 180.16 degrees surface serial number Radius of curvature (mm) Spacing(mm) Refractive index Nd Abbe coefficient Vd Effective focal length (mm) S1 15.56 0.55 1.76 52.00 -10.87 S2 4.61 1.35 S3 6.34 0.47 1.60 70.00 -12.14 S4 3.37 3.11 S5 -6.85 0.57 1.45 90.00 -29.95 S6 33.03 0.09 S7 13.26 2.61 1.72 30.00 14.06 S8 -14.59 0.18 S9 Infinity 1.02 S10 128.15 1.76 1.46 90.00 13.42 S11 -5.52 0.07 S12 12.60 2.11 1.60 70.00 11.95 S13 -12.99 0.66 S14 193.88 0.60 2.00 18.00 -7.48 S15 7.43 0.85 S16 13.74 2.18 1.80 50.00 8.87 S17 -11.73 5.75 Table I face number K E4 E6 E8 E10 S7 9.64E-04 3.28E-05 2.38E-06 -3.4E-07 S8 2.10E-03 9.19E-05 -7.25E-06 8.53E-07 S16 -3.37E-04 1.53E-05 -3.23E-08 S17 1.883 1.62E-04 8.16E-06 2.60E-07 Table II

表三為第一實施例之廣角鏡頭相關於上述條件式(1)~(9)的參數。 GAR1 GBR1 GBR2 G3R2 G6R2 G7R2 VB 13.26 128.15 -5.52 33.03 -12.99 7.43 90.00 G7R1 G5R1 f3 f4 f6 f8 193.88 128.15 -29.95 14.06 11.95 8.87 表三 Table 3 shows the parameters of the wide-angle lens of the first embodiment related to the above-mentioned conditional expressions (1) to (9). GAR1 GBR1 GBR2 G3R2 G6R2 G7R2 VB 13.26 128.15 -5.52 33.03 -12.99 7.43 90.00 G7R1 G5R1 f3 f4 f6 f8 193.88 128.15 -29.95 14.06 11.95 8.87 Table 3

表四顯示本發明第一實施例之廣角鏡頭中，依據條件式(1)~(9)計算得出的值，從表四可以看出，第一實施例之廣角鏡頭滿足條件式(1)~(9)之要求。條件式(1) 條件式(2) 條件式(3) 條件式(4) 條件式(5) 26.01 22.93 -15.89 -0.68 0.05 條件式(6) 條件式(7) 條件式(8) 條件式(9) 15.50 -0.42 0.08 27.51 表四 Table 4 shows the values calculated according to the conditional expressions (1) to (9) in the wide-angle lens of the first embodiment of the present invention. It can be seen from Table 4 that the wide-angle lens of the first embodiment satisfies the conditional expressions (1) to (9). 9) requirements. Condition (1) Condition (2) Condition (3) Condition (4) Condition (5) 26.01 22.93 -15.89 -0.68 0.05 Condition (6) Condition (7) Condition (8) Condition (9) 15.50 -0.42 0.08 27.51 Table 4

另外，第一實施例之廣角鏡頭的光學性能也可達到要求，由圖2B可看出場曲介於-0.03 mm至0.005 mm之間，由圖2C可看出畸變介於-3%至0%之間，由圖2D可看出縱向色差值介於-0.003mm至0.012mm之間。顯見第一實施例之廣角鏡頭之場曲、畸變、縱向色差都能被有效修正，解像力良好。In addition, the optical performance of the wide-angle lens of the first embodiment can also meet the requirements. It can be seen from FIG. 2B that the field curvature is between -0.03 mm and 0.005 mm, and it can be seen from FIG. 2C that the distortion is between -3% and 0%. 2D, it can be seen that the longitudinal color difference value is between -0.003mm and 0.012mm. It can be seen that the field curvature, distortion and longitudinal chromatic aberration of the wide-angle lens of the first embodiment can be effectively corrected, and the resolution is good.

第二實施例：Second embodiment:

請參閱圖3A至圖3D，其中圖3A顯示依據本發明第二實施例的廣角鏡頭的示意圖，圖3B至圖3D分別依序為第二實施例的畸變、場曲及縱向色差圖，量測過程中使用的光波長為0.555um。請參閱圖3A，與第一實施例不同的是，本發明第二實施例的廣角鏡頭中，第三透鏡L3和第五透鏡L5為彎月型透鏡，具體為凹凸透鏡，第七透鏡L7為雙凹透鏡。與第一實施例相同的是，第一透鏡群和第二透鏡群分別具有三枚凹透鏡和三枚凸透鏡。Please refer to FIGS. 3A to 3D , wherein FIG. 3A is a schematic diagram of a wide-angle lens according to a second embodiment of the present invention, and FIGS. 3B to 3D are diagrams of distortion, field curvature, and longitudinal chromatic aberration of the second embodiment, respectively, and the measurement process. The wavelength of light used in 0.555um. Referring to FIG. 3A , different from the first embodiment, in the wide-angle lens of the second embodiment of the present invention, the third lens L3 and the fifth lens L5 are meniscus lenses, specifically meniscus lenses, and the seventh lens L7 is a double lens concave lens. Similar to the first embodiment, the first lens group and the second lens group have three concave lenses and three convex lenses, respectively.

表五為該廣角鏡頭及各透鏡的相關參數表，表六為表五中非球面表面之相關參數表。從表六可知，本實施例中第四透鏡L4和第八透鏡L8為非球面透鏡。有效焦距=3.347mm 　　光圈值=1.84 鏡頭總長度=23.91mm 　視場=180.16度表面序號曲率半徑(mm) 間距(mm) 折射率 Nd 阿貝係數 Vd 有效焦距(mm) S1 16.07 0.56 1.75 52.00 -8.88 S2 4.65 1.39 S3 6.14 0.45 1.60 65.00 -13.49 S4 3.40 3.25 S5 -7.08 1.13 1.50 81.00 -17.01 S6 -43.88 0.12 S7 29.00 1.67 1.72 30.00 10.89 S8 -10.58 0.21 S9 Infinity 1.18 S10 -26.87 1.71 1.60 70.00 12.30 S11 -5.94 0.18 S12 14.67 2.11 1.60 70.00 10.40 S13 -10.32 0.65 S14 -50.20 0.53 2.00 18.00 -6.69 S15 7.85 0.62 S16 11.63 2.48 1.77 50.00 7.98 S17 -11.92 5.67 表五面號 K E4 E6 E8 E10 S7 8.58E-04 9.64E-05 1.08E-06 -3.8E-07 S8 2.19E-03 1.12E-04 -3.40E-07 1.17E-07 S16 -2.93E-04 1.21E-05 -3.60E-08 S17 1.603 2.40E-04 5.41E-06 2.58E-07 表六 Table 5 is a table of relevant parameters of the wide-angle lens and each lens, and Table 6 is a table of relevant parameters of the aspheric surface in Table 5. It can be known from Table 6 that the fourth lens L4 and the eighth lens L8 in this embodiment are aspherical lenses. Effective focal length=3.347mm Aperture value = 1.84 Total length of lens = 23.91mm Field of view = 180.16 degrees surface serial number Radius of curvature (mm) Spacing(mm) Refractive index Nd Abbe coefficient Vd Effective focal length (mm) S1 16.07 0.56 1.75 52.00 -8.88 S2 4.65 1.39 S3 6.14 0.45 1.60 65.00 -13.49 S4 3.40 3.25 S5 -7.08 1.13 1.50 81.00 -17.01 S6 -43.88 0.12 S7 29.00 1.67 1.72 30.00 10.89 S8 -10.58 0.21 S9 Infinity 1.18 S10 -26.87 1.71 1.60 70.00 12.30 S11 -5.94 0.18 S12 14.67 2.11 1.60 70.00 10.40 S13 -10.32 0.65 S14 -50.20 0.53 2.00 18.00 -6.69 S15 7.85 0.62 S16 11.63 2.48 1.77 50.00 7.98 S17 -11.92 5.67 Table 5 face number K E4 E6 E8 E10 S7 8.58E-04 9.64E-05 1.08E-06 -3.8E-07 S8 2.19E-03 1.12E-04 -3.40E-07 1.17E-07 S16 -2.93E-04 1.21E-05 -3.60E-08 S17 1.603 2.40E-04 5.41E-06 2.58E-07 Table 6

表七為第二實施例之廣角鏡頭相關於上述條件式(1)~(9)的參數。 GAR1 GBR1 GBR2 G3R2 G6R2 G7R2 VB 29.00 -26.87 -5.94 -43.88 -10.32 7.85 70.00 G7R1 G5R1 f3 f4 f6 f8 -50.20 -26.87 -17.01 10.89 10.4 7.98 表七 Table 7 shows the parameters of the wide-angle lens of the second embodiment related to the above-mentioned conditional expressions (1) to (9). GAR1 GBR1 GBR2 G3R2 G6R2 G7R2 VB 29.00 -26.87 -5.94 -43.88 -10.32 7.85 70.00 G7R1 G5R1 f3 f4 f6 f8 -50.20 -26.87 -17.01 10.89 10.4 7.98 Table 7

表八顯示本發明第二實施例之廣角鏡頭中，依據條件式(1)~(9)計算得出的值，從表八可以看出，第二實施例之廣角鏡頭滿足條件式(1)~(9)之要求。條件式(1) 條件式(2) 條件式(3) 條件式(4) 條件式(5) 21.29 18.87 -6.12 -1.07 -0.04 條件式(6) 條件式(7) 條件式(8) 條件式(9) -4.74 -0.09 0.11 -49.82 表八 Table 8 shows the values calculated according to the conditional expressions (1) to (9) in the wide-angle lens of the second embodiment of the present invention. It can be seen from Table 8 that the wide-angle lens of the second embodiment satisfies the conditional expressions (1) to (9). 9) requirements. Condition (1) Condition (2) Condition (3) Condition (4) Condition (5) 21.29 18.87 -6.12 -1.07 -0.04 Condition (6) Condition (7) Condition (8) Condition (9) -4.74 -0.09 0.11 -49.82 Table 8

另外，第二實施例之廣角鏡頭的光學性能也可達到要求，由圖3B可看出場曲介於-0.035 mm至0.005 mm之間，由圖3C可看出畸變介於-4%至0%之間，由圖3D可看出縱向色差值介於-0.015mm至0.003mm之間。顯見第二實施例之廣角鏡頭之場曲、畸變、縱向色差都能被有效修正，解像力良好。In addition, the optical performance of the wide-angle lens of the second embodiment can also meet the requirements. It can be seen from FIG. 3B that the field curvature is between -0.035 mm and 0.005 mm, and it can be seen from FIG. 3C that the distortion is between -4% and 0%. 3D, it can be seen that the longitudinal color difference value is between -0.015mm and 0.003mm. It can be seen that the field curvature, distortion and longitudinal chromatic aberration of the wide-angle lens of the second embodiment can be effectively corrected, and the resolution is good.

第三實施例：Third embodiment:

請參閱圖4A至圖4D，其中圖4A顯示依據本發明第三實施例的廣角鏡頭的示意圖，圖4B至圖4D分別依序為第三實施例的畸變、場曲及縱向色差圖，量測過程中使用的光波長為0.555um。請參閱圖4A，與第一實施例不同的是，本發明第三實施例的廣角鏡頭中，第三透鏡L3為彎月型透鏡，具體為凹凸透鏡，第五透鏡L5為雙凸透鏡，第七透鏡L7為雙凹透鏡。與第一實施例相同的是，第一透鏡群和第二透鏡群分別具有三枚凹透鏡和三枚凸透鏡。Please refer to FIGS. 4A to 4D , wherein FIG. 4A is a schematic diagram of a wide-angle lens according to a third embodiment of the present invention, and FIGS. 4B to 4D are diagrams of distortion, field curvature, and longitudinal chromatic aberration of the third embodiment, respectively, and the measurement process. The wavelength of light used in 0.555um. Referring to FIG. 4A , the difference from the first embodiment is that in the wide-angle lens of the third embodiment of the present invention, the third lens L3 is a meniscus lens, specifically a meniscus lens, the fifth lens L5 is a biconvex lens, and the seventh lens L7 is a biconcave lens. Similar to the first embodiment, the first lens group and the second lens group have three concave lenses and three convex lenses, respectively.

表九為該廣角鏡頭及各透鏡的相關參數表，表十為表九中非球面表面之相關參數表。從表十可知，本實施例中第八透鏡L8為非球面透鏡。有效焦距=3.35mm 　　光圈值=2.0　鏡頭總長度=27.5mm 　　視場=182度　表面序號曲率半徑(mm) 間距(mm) 折射率 Nd 阿貝係數 Vd 有效焦距(mm) S1 17.87 0.50 1.77 50.00 -10.86 S2 5.64 2.42 S3 10.05 0.50 1.50 80.00 -12.35 S4 3.77 4.29 S5 -6.01 1.41 1.50 90.00 -27.12 S6 -11.62 0.10 S7 90.51 1.94 1.80 26.00 14.18 S8 -12.95 0.55 S9 Infinity 0.66 S10 12.42 2.50 1.50 90.00 12.82 S11 -12.42 0.38 S12 10.44 1.95 1.60 70.00 11.57 S13 -19.43 0.44 S14 -14.30 0.53 2.00 18.00 -7.01 S15 14.30 1.32 S16 11.25 2.38 1.80 50.00 8.61 S17 -16.25 5.63 表九面號 K E4 E6 E8 S16 -0.426 -5.50E-04 1.34E-05 -4.15E-07 S17 0.454 2.82E-04 5.62E-06 -1.51E-07 表十 Table 9 is a table of relevant parameters of the wide-angle lens and each lens, and Table 10 is a table of relevant parameters of the aspheric surface in Table 9. It can be seen from Table 10 that the eighth lens L8 in this embodiment is an aspherical lens. Effective focal length=3.35mm Aperture = 2.0 Overall length of lens = 27.5mm Field of view = 182 degrees surface serial number Radius of curvature (mm) Spacing(mm) Refractive index Nd Abbe coefficient Vd Effective focal length (mm) S1 17.87 0.50 1.77 50.00 -10.86 S2 5.64 2.42 S3 10.05 0.50 1.50 80.00 -12.35 S4 3.77 4.29 S5 -6.01 1.41 1.50 90.00 -27.12 S6 -11.62 0.10 S7 90.51 1.94 1.80 26.00 14.18 S8 -12.95 0.55 S9 Infinity 0.66 S10 12.42 2.50 1.50 90.00 12.82 S11 -12.42 0.38 S12 10.44 1.95 1.60 70.00 11.57 S13 -19.43 0.44 S14 -14.30 0.53 2.00 18.00 -7.01 S15 14.30 1.32 S16 11.25 2.38 1.80 50.00 8.61 S17 -16.25 5.63 Table 9 face number K E4 E6 E8 S16 -0.426 -5.50E-04 1.34E-05 -4.15E-07 S17 0.454 2.82E-04 5.62E-06 -1.51E-07 Table 10

表十一為第三實施例之廣角鏡頭相關於上述條件式(1)~(9)的參數。 GAR1 GBR1 GBR2 G3R2 G6R2 G7R2 VB 90.51 12.42 -12.42 -11.62 -19.43 14.30 90.00 G7R1 G5R1 f3 f4 f6 f8 -14.30 12.42 -27.12 14.18 11.57 8.61 表十一 Table 11 shows the parameters of the wide-angle lens of the third embodiment related to the above conditional expressions (1) to (9). GAR1 GBR1 GBR2 G3R2 G6R2 G7R2 VB 90.51 12.42 -12.42 -11.62 -19.43 14.30 90.00 G7R1 G5R1 f3 f4 f6 f8 -14.30 12.42 -27.12 14.18 11.57 8.61 Table 11

表十二顯示本發明第三實施例之廣角鏡頭中，依據條件式(1)~(9)計算得出的值，從表十二可以看出，第三實施例之廣角鏡頭滿足條件式(1)~(9)之要求。條件式(1) 條件式(2) 條件式(3) 條件式(4) 條件式(5) 25.75 22.79 -12.94 -1.24 0.10 條件式(6) 條件式(7) 條件式(8) 條件式(9) -0.49 -0.06 0.16 -24.04 表十二 Table 12 shows the values calculated according to the conditional formulae (1) to (9) in the wide-angle lens of the third embodiment of the present invention. It can be seen from Table 12 that the wide-angle lens of the third embodiment satisfies the conditional formula (1) ~(9) requirements. Condition (1) Condition (2) Condition (3) Condition (4) Condition (5) 25.75 22.79 -12.94 -1.24 0.10 Condition (6) Condition (7) Condition (8) Condition (9) -0.49 -0.06 0.16 -24.04 Table 12

另外，第三實施例之廣角鏡頭的光學性能也可達到要求，由圖4B可看出場曲介於-0.03 mm至0.005 mm之間，由圖4C可看出畸變介於-3%至0%之間，由圖4D可看出縱向色差值介於-0.018mm至0.004mm之間。顯見第三實施例之廣角鏡頭之場曲、畸變、縱向色差都能被有效修正，解像力良好。In addition, the optical performance of the wide-angle lens of the third embodiment can also meet the requirements. It can be seen from FIG. 4B that the field curvature is between -0.03 mm and 0.005 mm, and it can be seen from FIG. 4C that the distortion is between -3% and 0%. 4D, it can be seen that the longitudinal color difference value is between -0.018mm and 0.004mm. It can be seen that the field curvature, distortion and longitudinal chromatic aberration of the wide-angle lens of the third embodiment can be effectively corrected, and the resolution is good.

第四實施例：Fourth embodiment:

請參閱圖5A至圖5D，其中圖5A顯示依據本發明第四實施例的廣角鏡頭的示意圖，圖5B至圖5D分別依序為第四實施例的畸變、場曲及縱向色差圖，量測過程中使用的光波長為0.555um。請參閱圖5A，與第三實施例不同的是，本發明第四實施例的廣角鏡頭還包括第九透鏡L9，其設置於第一透鏡群中，且位於第一透鏡L1與第二透鏡L2之間。第九透鏡L9具有負屈光度，其物側表面為凸面，像側表面為凹面。本發明第四實施例的廣角鏡頭沿左至右的屈光度依次為負、負、負、負、正、正、正、負、正，第一透鏡群具有四枚凹透鏡，第二透鏡群具有三枚凸透鏡。Please refer to FIGS. 5A to 5D , wherein FIG. 5A shows a schematic diagram of a wide-angle lens according to a fourth embodiment of the present invention, and FIGS. 5B to 5D are diagrams of distortion, field curvature, and longitudinal chromatic aberration of the fourth embodiment, respectively, and the measurement process. The wavelength of light used in 0.555um. Referring to FIG. 5A , different from the third embodiment, the wide-angle lens of the fourth embodiment of the present invention further includes a ninth lens L9, which is disposed in the first lens group and located between the first lens L1 and the second lens L2 between. The ninth lens L9 has negative refractive power, and its object-side surface is convex and its image-side surface is concave. The diopter of the wide-angle lens according to the fourth embodiment of the present invention is negative, negative, negative, negative, positive, positive, positive, negative, and positive in sequence from left to right. The first lens group has four concave lenses, and the second lens group has three concave lenses. convex lens.

表十三為該廣角鏡頭及各透鏡的相關參數表，表十四為表十三中非球面表面之相關參數表。從表十四可知，本實施例中第八透鏡L8為非球面透鏡。有效焦距=2.886mm 　　光圈值=2.0　鏡頭總長度=35mm 　　視場=222度　表面序號曲率半徑(mm) 間距(mm) 折射率 Nd 阿貝係數 Vd 有效焦距(mm) 1 25.07 1.72 1.83 43 -23.93 2 10.76 3.96 18 79.73 0.92 1.5 82 -10.44 19 4.89 2.13 3 11.00 0.97 1.5 82 -19.85 4 5.07 4.14 5 -6.54 0.82 1.45 90 -37.95 6 -11.00 0.07 7 37.08 1.68 1.76 27 13.22 8 -13.63 1.44 9 Infinity 0.86 10 22.27 2.62 1.6 70 14.79 11 -14.17 0.09 12 10.22 2.77 1.6 70 13.4 13 -34.24 0.15 14 -21.23 0.86 2 17 -7.39 15 11.77 1.36 16 8.36 2.96 1.7 58 7.76 17 -13.36 5.48 表十三面號 K E4 E6 E8 S16 0.407 -6.43E-04 1.35E-05 -3.27E-07 S17 4.488 6.75E-04 9.77E-06 1.26E-07 表十四 Table 13 is a table of relevant parameters of the wide-angle lens and each lens, and Table 14 is a table of relevant parameters of the aspheric surface in Table 13. It can be seen from Table 14 that the eighth lens L8 in this embodiment is an aspherical lens. Effective focal length=2.886mm Aperture = 2.0 Total length of lens = 35mm Field of view = 222 degrees surface serial number Radius of curvature (mm) Spacing(mm) Refractive index Nd Abbe coefficient Vd Effective focal length (mm) 1 25.07 1.72 1.83 43 -23.93 2 10.76 3.96 18 79.73 0.92 1.5 82 -10.44 19 4.89 2.13 3 11.00 0.97 1.5 82 -19.85 4 5.07 4.14 5 -6.54 0.82 1.45 90 -37.95 6 -11.00 0.07 7 37.08 1.68 1.76 27 13.22 8 -13.63 1.44 9 Infinity 0.86 10 22.27 2.62 1.6 70 14.79 11 -14.17 0.09 12 10.22 2.77 1.6 70 13.4 13 -34.24 0.15 14 -21.23 0.86 2 17 -7.39 15 11.77 1.36 16 8.36 2.96 1.7 58 7.76 17 -13.36 5.48 Table 13 face number K E4 E6 E8 S16 0.407 -6.43E-04 1.35E-05 -3.27E-07 S17 4.488 6.75E-04 9.77E-06 1.26E-07 Table 14

表十五為第四實施例之廣角鏡頭相關於上述條件式(1)~(9)的參數。 GAR1 GBR1 GBR2 G3R2 G6R2 G7R2 VB 37.08 22.27 -14.17 -11.00 -34.24 11.77 70.00 G7R1 G5R1 f3 f4 f6 f8 -21.23 22.27 -37.95 13.22 13.4 7.76 表十五 Table 15 shows the parameters of the wide-angle lens of the fourth embodiment related to the above conditional expressions (1) to (9). GAR1 GBR1 GBR2 G3R2 G6R2 G7R2 VB 37.08 22.27 -14.17 -11.00 -34.24 11.77 70.00 G7R1 G5R1 f3 f4 f6 f8 -21.23 22.27 -37.95 13.22 13.4 7.76 Table 15

表十六顯示本發明第四實施例之廣角鏡頭中，依據條件式(1)~(9)計算得出的值，從表十六可以看出，第四實施例之廣角鏡頭滿足條件式(1)~(9)之要求。條件式(1) 條件式(2) 條件式(3) 條件式(4) 條件式(5) 26.62 20.98 -24.73 -1.21 0.09 條件式(6) 條件式(7) 條件式(8) 條件式(9) -1.02 -0.61 0.17 -25.17 表十六 Table 16 shows the values calculated according to conditional expressions (1) to (9) in the wide-angle lens of the fourth embodiment of the present invention. It can be seen from Table 16 that the wide-angle lens of the fourth embodiment satisfies conditional expression (1) ~(9) requirements. Condition (1) Condition (2) Condition (3) Condition (4) Condition (5) 26.62 20.98 -24.73 -1.21 0.09 Condition (6) Condition (7) Condition (8) Condition (9) -1.02 -0.61 0.17 -25.17 Table 16

另外，第四實施例之廣角鏡頭的光學性能也可達到要求，由圖5B可看出場曲介於-0.16 mm至0.04 mm之間，由圖5C可看出畸變介於-22.5%至0%之間，由圖5D可看出縱向色差值介於-0.014mm至0.002mm之間。顯見第四實施例之廣角鏡頭之場曲、畸變、縱向色差都能被有效修正，解像力良好。In addition, the optical performance of the wide-angle lens of the fourth embodiment can also meet the requirements. It can be seen from FIG. 5B that the field curvature is between -0.16 mm and 0.04 mm, and it can be seen from FIG. 5C that the distortion is between -22.5% and 0%. 5D, it can be seen that the longitudinal color difference value is between -0.014mm and 0.002mm. It can be seen that the field curvature, distortion and longitudinal chromatic aberration of the wide-angle lens of the fourth embodiment can be effectively corrected, and the resolution is good.

本發明符合的條件式以(1) 21.02≦f4+f6≦26.89；(2) 18.66≦f4+f8≦23.13；(3) -25.66≦f4+f3≦-5.19；(4) -1.29≦(G7R2-G6R2)/f3≦-0.62；(5) -0.06≦(G7R1/G3R2)/G5R1≦0.12；(6) -5≦(GBR1+G6R2)/G7R2≦16；(7) -0.64≦(G7R2+G6R2)/GAR1≦-0.03；(8) -0.72≦G7R2/VB≦2.15；(9) -50≦GBR2+G3R2≦28為中心，本發明實施例的數值也落入這些條件式的範圍內。條件式(1)、(2)有助於縮小成像平面IMA上的主光線角度，並提升週邊光量，條件式(3)、(4)、(5)、(7)有助於減小像面彎曲程度及提升倍率色差表現，條件式(6)可進一步修正像面彎曲，條件式(8)有助於修正縱向色差，滿足條件式(9)則具有最佳球面像差表現。因此，本發明的廣角鏡頭具有像面彎曲小及倍率色差表現佳等優點，成像品質優異。The conditional expressions that the present invention complies with are (1) 21.02≦f4+f6≦26.89; (2) 18.66≦f4+f8≦23.13; (3) -25.66≦f4+f3≦-5.19; (4) -1.29≦(G7R2 -G6R2)/f3≦-0.62; (5) -0.06≦(G7R1/G3R2)/G5R1≦0.12; (6) -5≦(GBR1+G6R2)/G7R2≦16; (7) -0.64≦(G7R2+ G6R2)/GAR1≦-0.03; (8) -0.72≦G7R2/VB≦2.15; (9) -50≦GBR2+G3R2≦28 as the center, the numerical values of the embodiments of the present invention also fall within the range of these conditional expressions. Conditional expressions (1) and (2) help to reduce the chief ray angle on the imaging plane IMA and increase the amount of peripheral light. Conditional expressions (3), (4), (5) and (7) help to reduce the image The degree of surface curvature and the chromatic aberration performance of the improved magnification, the conditional formula (6) can further correct the image surface curvature, the conditional formula (8) is helpful to correct the longitudinal chromatic aberration, and the conditional formula (9) is satisfied to have the best spherical aberration performance. Therefore, the wide-angle lens of the present invention has the advantages of small field curvature, good performance of magnification chromatic aberration, etc., and excellent imaging quality.

雖然本發明已用較佳實施例揭露如上，然其並非用以限定本發明，本發明所屬技術領域中具有通常知識者，在不脫離本發明之精神和範圍內，當可作各種之更動與潤飾，因此本發明之保護範圍當視後附之申請專利範圍所界定者為準。Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field to which the present invention pertains can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the appended patent application.

IMA:成像平面IMA: Imaging plane

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:第四透鏡L4: Fourth lens

L5:第五透鏡L5: Fifth lens

L6:第六透鏡L6: sixth lens

L7:第七透鏡L7: seventh lens

L8:第八透鏡L8: Eighth lens

L9:第九透鏡L9: ninth lens

OA:光軸OA: Optical axis

S1:第一透鏡物側表面S1: the object side surface of the first lens

S2:第一透鏡像側表面S2: The image side surface of the first lens

S3:第二透鏡物側表面S3: Object side surface of the second lens

S4:第二透鏡像側表面S4: Second lens image side surface

S5:第三透鏡物側表面S5: Object side surface of the third lens

S6:第三透鏡像側表面S6: Third lens image side surface

S7:第四透鏡物側表面S7: Fourth lens object side surface

S8:第四透鏡像側表面S8: Fourth lens image side surface

S9:光圈表面S9: Aperture Surface

S10:第五透鏡物側表面S10: Object side surface of fifth lens

S11:第五透鏡像側表面S11: Image side surface of fifth lens

S12:第六透鏡物側表面S12: Object side surface of sixth lens

S13:第六透鏡像側表面S13: Image side surface of sixth lens

S14:第七透鏡物側表面S14: Object side surface of seventh lens

S15:第七透鏡像側表面S15: Image-side surface of the seventh lens

S16:第八透鏡物側表面S16: Object-side surface of the eighth lens

S17:第八透鏡像側表面S17: Image-side surface of the eighth lens

S18:第九透鏡物側表面S18: Object side surface of ninth lens

S19:第九透鏡像側表面S19: Image side surface of ninth lens

STO:光圈STO: Aperture

[圖1]顯示依據本發明的廣角鏡頭的示意圖。 [圖2A、2B、2C、2D]顯示依據本發明第一實施例的廣角鏡頭的示意圖、場曲圖、畸變圖、縱向色差圖。 [圖3A、3B、3C、3D]顯示依據本發明第二實施例的廣角鏡頭的示意圖、場曲圖、畸變圖、縱向色差圖。 [圖4A、4B、4C、4D]顯示依據本發明第三實施例的廣角鏡頭的示意圖、場曲圖、畸變圖、縱向色差圖。 [圖5A、5B、5C、5D]顯示依據本發明第四實施例的廣角鏡頭的示意圖、場曲圖、畸變圖、縱向色差圖。 [FIG. 1] A schematic diagram showing a wide-angle lens according to the present invention. [FIG. 2A, 2B, 2C, 2D] shows a schematic diagram, a field curvature diagram, a distortion diagram, and a longitudinal chromatic aberration diagram of the wide-angle lens according to the first embodiment of the present invention. [FIG. 3A, 3B, 3C, 3D] shows a schematic diagram, a field curvature diagram, a distortion diagram, and a longitudinal chromatic aberration diagram of the wide-angle lens according to the second embodiment of the present invention. [FIG. 4A, 4B, 4C, 4D] shows a schematic diagram, a field curvature diagram, a distortion diagram, and a longitudinal chromatic aberration diagram of the wide-angle lens according to the third embodiment of the present invention. [FIG. 5A, 5B, 5C, 5D] shows a schematic diagram, a field curvature diagram, a distortion diagram, and a longitudinal chromatic aberration diagram of the wide-angle lens according to the fourth embodiment of the present invention.

IMA:成像平面 IMA: Imaging plane

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:第四透鏡 L4: Fourth lens

L5:第五透鏡 L5: Fifth lens

L6:第六透鏡 L6: sixth lens

L7:第七透鏡 L7: seventh lens

L8:第八透鏡 L8: Eighth lens

OA:光軸 OA: Optical axis

STO:光圈 STO: Aperture

Claims

一種廣角鏡頭，其從物側至像側在光軸上依序包含：一第一透鏡，其為具負屈光度的透鏡，其像側表面為凹面；一第二透鏡，其為具負屈光度的透鏡，其像側表面為凹面；一第三透鏡，其為具負屈光度的透鏡；一第四透鏡，其為具正屈光度的透鏡；一第五透鏡，其為具屈光度的透鏡；一第六透鏡，其為具正屈光度的透鏡，其物側表面為凸面，像側表面為凸面；一第七透鏡，其為具負屈光度的透鏡；一第八透鏡，其為具正屈光度的透鏡，其物側表面為凸面，像側表面為凸面；以及一光圈，設置於該第一透鏡至該第八透鏡中兩相鄰透鏡之間；其中該廣角鏡頭滿足以下條件式：-0.64≦(G7R2+G6R2)/GAR1≦-0.03，其中GAR1為位於該光圈前第一枚透鏡之物側表面的曲率半徑，G6R2為該第六透鏡之像側表面的曲率半徑，G7R2為該第七透鏡之像側表面的曲率半徑。 A wide-angle lens, which sequentially comprises on the optical axis from the object side to the image side: a first lens, which is a lens with negative refractive power, and whose image side surface is concave; a second lens, which is a lens with negative refractive power , whose image-side surface is concave; a third lens, which is a lens with negative refractive power; a fourth lens, which is a lens with positive refractive power; a fifth lens, which is a lens with refractive power; a sixth lens , which is a lens with positive refractive power, the object-side surface is convex, and the image-side surface is convex; a seventh lens, which is a lens with negative refractive power; an eighth lens, which is a lens with positive refractive power, whose object The side surface is convex, and the image side surface is convex; and an aperture is arranged between two adjacent lenses in the first lens to the eighth lens; wherein the wide-angle lens satisfies the following conditional formula: -0.64≦(G7R2+G6R2) /GAR1≦-0.03, where GAR1 is the curvature radius of the object-side surface of the first lens located in front of the aperture, G6R2 is the curvature radius of the image-side surface of the sixth lens, and G7R2 is the curvature radius of the image-side surface of the seventh lens Radius of curvature.

一種廣角鏡頭，其從物側至像側在光軸上依序包含：一第一透鏡，其為具負屈光度的透鏡，其像側表面為凹面；一第二透鏡，其為具負屈光度的透鏡，其像側表面為凹面；一第三透鏡，其為具負屈光度的透鏡；一第四透鏡，其為具正屈光度的透鏡；一第五透鏡，其為具屈光度的透鏡；一第六透鏡，其為具正屈光度的透鏡，其物側表面為凸面，像側表面為凸面；一第七透鏡，其為具負屈光度的透鏡；一第八透鏡，其為具正屈光度的透鏡，其物側表面為凸面，像側表面為凸面；以及一光圈，設置於該第一透鏡至該第八透鏡中兩相鄰透鏡之間；其中該廣角鏡頭滿足以下條件式：-1.29≦(G7R2-G6R2)/f3≦-0.62，其中G6R2為該第六透鏡之像側表面的曲率半徑，G7R2為該第七透鏡之像側表面的曲率半徑，f3為該第三透鏡的有效焦距。 A wide-angle lens, which sequentially comprises on the optical axis from the object side to the image side: a first lens, which is a lens with negative refractive power, and whose image side surface is concave; a second lens, which is a lens with negative refractive power , whose image-side surface is concave; a third lens, which is a lens with negative refractive power; A fourth lens, which is a lens with positive refractive power; a fifth lens, which is a lens with refractive power; a sixth lens, which is a lens with positive refractive power, whose object-side surface is convex, and its image-side surface is convex A seventh lens, which is a lens with negative refractive power; an eighth lens, which is a lens with positive refractive power, whose object-side surface is convex, and its image-side surface is convex; and an aperture, which is arranged on the first lens to between two adjacent lenses in the eighth lens; wherein the wide-angle lens satisfies the following conditional formula: -1.29≦(G7R2-G6R2)/f3≦-0.62, where G6R2 is the curvature radius of the image-side surface of the sixth lens, G7R2 is the curvature radius of the image-side surface of the seventh lens, and f3 is the effective focal length of the third lens.

一種廣角鏡頭，其從物側至像側在光軸上依序包含：一第一透鏡，其為具負屈光度的透鏡，其像側表面為凹面；一第二透鏡，其為具負屈光度的透鏡，其像側表面為凹面；一第三透鏡，其為具負屈光度的透鏡，其像側表面為凸面；一第四透鏡，其為具正屈光度的透鏡；一第五透鏡，其為具屈光度的透鏡，其物側表面為凹面；一第六透鏡，其為具正屈光度的透鏡，其物側表面為凸面，像側表面為凸面；一第七透鏡，其為具負屈光度的透鏡；一第八透鏡，其為具正屈光度的透鏡，其物側表面為凸面，像側表面為凸面；以及一光圈，設置於該第一透鏡至該第八透鏡中兩相鄰透鏡之間。 A wide-angle lens, which sequentially comprises on the optical axis from the object side to the image side: a first lens, which is a lens with negative refractive power, and whose image side surface is concave; a second lens, which is a lens with negative refractive power , its image-side surface is concave; a third lens, which is a lens with negative diopter, its image-side surface is convex; a fourth lens, which is a lens with positive diopter; a fifth lens, which is a diopter a lens with a concave surface on the object side; a sixth lens with a positive refractive power, a convex on the object side and a convex on the image side; a seventh lens with a negative refractive power; An eighth lens is a lens with positive refractive power, and its object side surface is convex, and its image side surface is convex; and an aperture is arranged between two adjacent lenses among the first lens to the eighth lens.

一種廣角鏡頭，其從物側至像側在光軸上依序包含：一第一透鏡，其為具負屈光度的透鏡，其像側表面為凹面；一第二透鏡，其為具負屈光度的透鏡，其像側表面為凹面；一第三透鏡，其為具負屈光度的透鏡，其像側表面為凹面；一第四透鏡，其為具正屈光度的透鏡；一第五透鏡，其為具屈光度的透鏡；一第六透鏡，其為具正屈光度的透鏡，其物側表面為凸面，像側表面為凸面；一第七透鏡，其為具負屈光度的透鏡，其物側表面為凸面；一第八透鏡，其為具正屈光度的透鏡，其物側表面為凸面，像側表面為凸面；以及一光圈，設置於該第一透鏡至該第八透鏡中兩相鄰透鏡之間。 A wide-angle lens, which sequentially comprises on the optical axis from the object side to the image side: a first lens, which is a lens with negative refractive power, and whose image side surface is concave; a second lens, which is a lens with negative refractive power , its image-side surface is concave; a third lens, which is a lens with negative diopter, its image-side surface is concave; a fourth lens, which is a lens with positive diopter; a fifth lens, which is a diopter a sixth lens, which is a lens with positive refractive power, and whose object-side surface is convex, and whose image-side surface is convex; a seventh lens, which is a lens with negative refractive power, whose object-side surface is convex; a The eighth lens is a lens with positive refractive power, the object side surface is convex, and the image side surface is convex; and an aperture is arranged between two adjacent lenses among the first lens to the eighth lens.

如請求項1至4中任一項所述之廣角鏡頭，其中該第三透鏡的物側表面為凹面，該第五透鏡的像側表面為凸面，該第七透鏡的像側表面為凹面。 The wide-angle lens according to any one of claims 1 to 4, wherein the object-side surface of the third lens is concave, the image-side surface of the fifth lens is convex, and the image-side surface of the seventh lens is concave noodle.

如請求項1或2所述之廣角鏡頭，其中該第三透鏡的像側表面為凸面，該第七透鏡的物側表面為凹面。 The wide-angle lens of claim 1 or 2, wherein the image-side surface of the third lens is The object-side surface of the seventh lens is concave.

如請求項1至3中任一項所述之廣角鏡頭，其中該第五透鏡的物側表面為凸面。 The wide-angle lens according to any one of claims 1 to 3, wherein the object-side surface of the fifth lens is convex.

如請求項1至4中任一項所述之廣角鏡頭，其中沿著該光圈往該物側之方向設置的透鏡為位於該光圈前的透鏡，沿著該光圈往該像側之方向設置的透鏡為位於該光圈後的透鏡，其中位於該光圈前的透鏡包括至少一枚透鏡，位於該光圈後的透鏡包括至少一枚透鏡。 The wide-angle lens according to any one of claims 1 to 4, wherein the lens disposed along the aperture toward the object side is a lens located in front of the aperture, and the lens disposed along the aperture toward the image side It is a lens located behind the aperture, wherein the lens located in front of the aperture includes at least one lens, and the lens located behind the aperture includes at least one lens.

如請求項8所述之廣角鏡頭，其中該廣角鏡頭至少滿足以下其中一條件式：-5≦(GBR1+G6R2)/G7R2≦16；-50≦GBR2+G3R2≦28；-0.72≦G7R2/VB≦2.15；其中GBR1為位於該光圈後第一枚透鏡之物側表面的曲率半徑，GBR2為位於該光圈後第一枚透鏡之像側表面的曲率半徑，G3R2為該第三透鏡之像側表面的曲率半徑，G6R2為該第六透鏡之像側表面的曲率半徑，G7R2為該第七透鏡之像側表面的曲率半徑，VB為位於該光圈後第一枚透鏡的阿貝係數。 The wide-angle lens of claim 8, wherein the wide-angle lens satisfies at least one of the following conditions: -5≦(GBR1+G6R2)/G7R2≦16;-50≦GBR2+G3R2≦28;-0.72≦G7R2/VB≦2.15 ; wherein GBR1 is the radius of curvature of the object-side surface of the first lens behind the aperture, GBR2 is the radius of curvature of the image-side surface of the first lens behind the aperture, and G3R2 is the curvature of the image-side surface of the third lens Radius, G6R2 is the curvature radius of the image side surface of the sixth lens, G7R2 is the curvature radius of the seventh lens image side surface, VB is the Abbe coefficient of the first lens behind the aperture.

如請求項8所述之廣角鏡頭，其中該廣角鏡頭至少滿足以下其中一條件式：-25.66≦f4+f3≦-5.19；21.02≦f4+f6≦26.89；18.66≦f4+f8≦23.13；-0.06≦(G7R1/G3R2)/G5R1≦0.12；其中f3為該第三透鏡的有效焦距，f4為該第四透鏡的有效焦距，f6為該第六透鏡的有效焦距，f8為該第八透鏡的有效焦距，G3R2為該第三透鏡之像側表面的曲率半徑，G5R1為該第五透鏡之物側表面的曲率半徑，G7R1為該第七透鏡之物側表面的曲率半徑。 The wide-angle lens of claim 8, wherein the wide-angle lens satisfies at least one of the following conditional expressions: -25.66≦f4+f3≦-5.19; 21.02≦f4+f6≦26.89; 18.66≦f4+f8≦23.13;-0.06≦( G7R1/G3R2)/G5R1≦0.12; where f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f6 is the effective focal length of the sixth lens, and f8 is the effective focal length of the eighth lens, G3R2 is the image side surface of the third lens The radius of curvature of the surface, G5R1 is the radius of curvature of the object-side surface of the fifth lens, and G7R1 is the radius of curvature of the object-side surface of the seventh lens.

如請求項1或2所述之廣角鏡頭，更包含一第九透鏡，設置於該第一透鏡與該第三透鏡之間，該第九透鏡具有負屈光度，其物側表面為凸面，像側表面為凹面。The wide-angle lens according to claim 1 or 2, further comprising a ninth lens disposed between the first lens and the third lens, the ninth lens has a negative refractive power, the object-side surface is convex, and the image-side surface is is concave.