TW201807452A

TW201807452A - An optical lens

Info

Publication number: TW201807452A
Application number: TW105127747A
Authority: TW
Inventors: 劉佩青; 周昱宏; 李衍德; 王國權
Original assignee: 揚明光學股份有限公司
Priority date: 2016-08-29
Filing date: 2016-08-29
Publication date: 2018-03-01
Also published as: TWI699550B; CN107783265B; CN107783265A

Abstract

The present invention discloses an optical lens. The optical lens may comprise two lens groups and a stop disposed there between. The first lens group comprises one lens with refractive power, and the second lens group comprises at least two cement lens, the second lens comprises a lens having abbe number larger than 70; moreover, the total length of the optical lens over the effective focal length equal to or small than 10.

Description

光學鏡頭Optical lens

本發明是有關於一種光學鏡頭，且特別是有關於一種有可動群之光學鏡頭及系統。The present invention relates to an optical lens, and more particularly to an optical lens and system having a movable group.

近年來隨科技的進展，光學鏡頭的種類日漸多元，光學投影鏡頭即是其中之一者。一般傳統的光學投影鏡頭的架構約使用六至八片鏡片。而大光圈鏡頭中，因應畸變(distortion)及色差(chromatic aberration)問題，多使用複數片非球面鏡片以及多組膠合透鏡。而前述的畸變係由像點與光軸距離不同，致使其側向放大率而隨之不同所產生的；而色差則係因各光線波長經過光學界而時發散角不同所致。With the development of science and technology in recent years, the types of optical lenses have become increasingly diverse, and optical projection lenses are one of them. The architecture of a conventional optical projection lens uses about six to eight lenses. In large-aperture lenses, multiple aspheric lenses and multiple groups of cemented lenses are used in response to the problems of distortion and chromatic aberration. The aforementioned distortion is caused by the difference between the distance between the image point and the optical axis, which causes the lateral magnification to be different; and the chromatic aberration is caused by the divergence angle of each light wavelength when passing through the optical boundary.

然而，各種需求亦在更新，例如是像面大小(Image circle)的增加、感測器的像素因應解析度需求的提高而縮小、更小的畸變、更短的鏡頭以及更大的最大視場角等需求，傳統的架構已無法滿足新型鏡頭對光學品質的需求，故需要在製造成本取得平衡的前提下設計一新架構來滿足以上提到的大視場角、高投射比、高解像、大光圈以及最大視場角的需求。However, various requirements are also being updated, such as the increase in image circle size, the reduction of the sensor pixels in response to the increase in resolution requirements, smaller distortions, shorter lenses, and a larger maximum field of view Angle and other requirements, the traditional architecture can no longer meet the optical quality requirements of new lenses, so a new architecture needs to be designed on the premise of balancing manufacturing costs to meet the above-mentioned large viewing angles, high projection ratios, and high resolutions. , Large aperture, and maximum field of view.

根據本發明的一個觀點，其係關係於一種光學鏡頭，光學鏡頭大致包括兩個透鏡群以及一設於其兩者之間的光圈(STOP)。第一透鏡作為可動對焦群，包括一片具有屈光度的透鏡，而第二透鏡群則包括二片雙膠合透鏡，同時，第二透鏡群可包括一片阿貝數大於70的透鏡；再者，光學鏡頭的總長除以光學鏡頭的有效焦距之比值小於等於10。According to an aspect of the present invention, it relates to an optical lens. The optical lens generally includes two lens groups and a stop (STOP) disposed between the two lens groups. The first lens as a movable focusing group includes a lens having a diopter, and the second lens group includes two double cemented lenses. At the same time, the second lens group may include a lens having an Abbe number greater than 70; further, an optical lens The ratio of the total length of the lens divided by the effective focal length of the optical lens is less than or equal to 10.

另外，第一透鏡群可包括兩片相互鄰接的非球面透鏡；再者，第二透鏡群可包括三片非球面透鏡。第二透鏡群可包括一片阿貝數大於等於80的透鏡；光學鏡頭中，其具有屈光度的透鏡數量可控制在9片以下。另外，光學鏡頭之放大側及縮小側之第一片具有屈光度的透鏡可均為非球面透鏡。另外，第一透鏡群於放大側的第一片具有屈光度的透鏡的半直徑可小於14。再者，光學鏡頭之總長可小於90mm。In addition, the first lens group may include two aspheric lenses adjacent to each other; further, the second lens group may include three aspheric lenses. The second lens group may include one lens with an Abbe number of 80 or more. In an optical lens, the number of lenses having diopters may be controlled to less than nine. In addition, the first lens having the diopter on the magnification side and the reduction side of the optical lens may be an aspheric lens. In addition, the half diameter of the first lens having the diopter on the magnification side of the first lens group may be less than 14. Moreover, the total length of the optical lens may be less than 90 mm.

另外，本發明的光學鏡頭亦得包括第一及第二透鏡群。第一透鏡群，包含兩片透鏡，該兩片透鏡中包括一非球面透鏡。In addition, the optical lens of the present invention may also include first and second lens groups. The first lens group includes two lenses, and the two lenses include an aspheric lens.

第二透鏡群，包含一片膠合透鏡，而膠合透鏡中包括一片阿貝數超過70的透鏡；以及一設於該第一透鏡群及該第二透鏡群之間的光圈；其中，光學鏡頭之光圈值小於等於2，而且光學鏡頭之最大視場角大於100度。The second lens group includes a cemented lens, and the cemented lens includes a lens with an Abbe number exceeding 70; and an aperture provided between the first lens group and the second lens group; wherein the aperture of the optical lens The value is 2 or less, and the maximum field angle of the optical lens is greater than 100 degrees.

按前述的設計，本發明得於有限的成本下，提供優異的光學性能。為讓本發明更明顯易懂，下文特舉實施例，並配合所附圖式作詳細說明如下。According to the aforementioned design, the present invention provides excellent optical performance at a limited cost. In order to make the present invention more comprehensible, embodiments are hereinafter described in detail with reference to the accompanying drawings.

本發明關於一種光學系統。光學系統可為一影像投影系統、一投影機、一影像擷取系統或為一攝影機。請參閱第1圖，第1圖繪示了本發明的第一實施例的光學系統的示意圖。於本具體實施例中，光學系統1為一投影機。本具體實施例在最簡化時得包括有一光學鏡頭10、一光源20以及一光閥30。光源20向光閥30提供照明光，光閥30將照明光轉化成影像光後藉由光學鏡頭10投影至一投影表面2。光閥30可為數位微型鏡片裝置(DMD)、液晶LCD或是其他具有把照明光轉化成影像光的元件或是裝置。光源20可包括一可視光的發光二極體晶片、非可視光發光二極體晶片或是雷射晶片等半導體晶片配合波長轉換材料或是其他應用於投影領域的光源配合各式光學元件亦可。The invention relates to an optical system. The optical system can be an image projection system, a projector, an image capture system, or a camera. Please refer to FIG. 1, which illustrates a schematic diagram of an optical system according to a first embodiment of the present invention. In this embodiment, the optical system 1 is a projector. In the most simplified embodiment, the specific embodiment includes an optical lens 10, a light source 20 and a light valve 30. The light source 20 provides illumination light to the light valve 30, and the light valve 30 converts the illumination light into image light and projects it onto a projection surface 2 through the optical lens 10. The light valve 30 may be a digital micro lens device (DMD), a liquid crystal LCD, or other components or devices having a function of converting illumination light into image light. The light source 20 may include a visible light emitting diode wafer, a non-visible light emitting diode wafer, or a semiconductor wafer such as a laser wafer with a wavelength conversion material or other light sources used in the projection field with various optical elements .

於本具體實施例中，光學鏡頭10為一投影鏡頭；光閥30是一運用數位光學處理技術(DLP)的數位微型鏡片裝置(DMD)晶片。前述的晶片具有一矩型對角線大小約為0.47英吋的反射表面，該反射表面具有多個微型反射鏡，而每個微型反射鏡之高寬為5.4um，而各個微型反射鏡為一像素，該晶片高度方向及水平方向分別具有1920以及1080個像素。而晶片之有效區域之高(H)及寬(V)分別約為10.37mm以及5.832mm。再者，光源20為能分別輸出多種不同波段的複數個發光二極體封裝體。而光源20及光閥30之間包括了一合光裝置(未標示)，該合光裝置包括了一個X字狀的合光濾鏡組，而光源的各個發光二極體封裝體係設於前述合光濾鏡組之各個方向。In this embodiment, the optical lens 10 is a projection lens; the light valve 30 is a digital micro lens device (DMD) chip using digital optical processing technology (DLP). The aforementioned chip has a reflective surface with a rectangular diagonal size of about 0.47 inches. The reflective surface has a plurality of micro-mirrors, and the height and width of each micro-mirror is 5.4um, and each micro-mirror is a Pixels, the wafer height direction and horizontal direction have 1920 and 1080 pixels, respectively. The height (H) and width (V) of the effective area of the chip are about 10.37mm and 5.832mm, respectively. In addition, the light source 20 is a plurality of light emitting diode packages capable of outputting a plurality of different wavelength bands, respectively. A light combining device (not labeled) is included between the light source 20 and the light valve 30. The light combining device includes an X-shaped light combining filter group, and each light emitting diode packaging system of the light source is provided in the foregoing. Combining filters in all directions.

於本具體實施例中，光學鏡頭10得設於放大側OS以及縮小側IS之間。於本具體實施例中，光學鏡頭10被應用為投影鏡頭，其放大側係指鏡頭10輸出影像光的一端，而縮小側則係指鏡頭10相對於光閥30之一側。但若光學鏡頭10用作取像時，縮小側則係指鏡頭10相對於感光元件的之一端。In this specific embodiment, the optical lens 10 may be disposed between the magnification side OS and the reduction side IS. In this embodiment, the optical lens 10 is applied as a projection lens, and the magnified side refers to one end of the lens 10 outputting image light, and the reduced side refers to one side of the lens 10 relative to the light valve 30. However, when the optical lens 10 is used for capturing images, the reduction side refers to one end of the lens 10 with respect to the photosensitive element.

如圖所繪述，光學鏡頭10可包括，依放大側OS往縮小側IS沿光軸排列之，第一透鏡群11、一光圈S(STOP)、第二透鏡群1以及例如是全反射棱鏡(TIR PRISM)以及覆蓋玻璃(CG，Cover glass)等光學元件。再者，光圈S得視設計之需要而獨立設置感是整合於透鏡之表面，本發明不對其多加限制。As shown in the figure, the optical lens 10 may include a first lens group 11, an aperture S (STOP), a second lens group 1, and a total reflection prism, for example, arranged along the optical axis according to the magnification OS and the reduction IS. (TIR PRISM) and cover glass (CG, Cover glass) and other optical elements. Moreover, the independent setting of the aperture S is integrated on the surface of the lens according to the needs of the design, which is not limited in the present invention.

承前所述，於本具體實施例中，光學鏡頭10包括有第一透鏡群11以及第二透鏡群12，而二者由一光圈S所分隔。第一透鏡群11為可動對焦群，而第一透鏡群11包括了四片光學元件L1~L4，各光學元件之屈光度依序分別為負、負、正、正，於本具體實施例中，光學元件L1~L4分別為一透鏡。而第二透鏡群12包括了三片光學元件L5~L7，各透鏡之屈光度依序分別為負、正、正。其中，光學元件L5及L6均為雙膠合透鏡，亦即光學元件L5及L6均分別地由兩片透鏡L51、L52及透鏡L61及L62所膠合而成。透鏡L51之屈光度為正，透鏡L52之屈光度為負，透鏡L61之屈光度為正，而透鏡L62之屈光度為負。再者，本發明各例中提及的膠合透鏡並不以利用黏膠結合為限，其也得以機構或是其他方式相互固定而成，本發明不以此為限。As mentioned above, in this embodiment, the optical lens 10 includes a first lens group 11 and a second lens group 12, and the two are separated by an aperture S. The first lens group 11 is a movable focusing group, and the first lens group 11 includes four optical elements L1 to L4, and the diopters of each optical element are sequentially negative, negative, positive, and positive. In this specific embodiment, Each of the optical elements L1 to L4 is a lens. The second lens group 12 includes three optical elements L5 to L7, and the diopters of the lenses are sequentially negative, positive, and positive. Among them, the optical elements L5 and L6 are double cemented lenses, that is, the optical elements L5 and L6 are respectively cemented by two lenses L51, L52 and lenses L61 and L62. The power of lens L51 is positive, the power of lens L52 is negative, the power of lens L61 is positive, and the power of lens L62 is negative. Furthermore, the cemented lenses mentioned in the examples of the present invention are not limited to the use of adhesive bonding, they can also be fixed to each other in a mechanism or other ways, and the present invention is not limited thereto.

而本具體實施例之光學系統中各元件之細部參數，可參閱下列表一至表二。For detailed parameters of each element in the optical system of this embodiment, please refer to Tables 1 to 2 below.

表一 Table I

表一係記載了光學系統中各透鏡之光學參數之值，所述之表面編號中之＊號是代表該表面為一非球面；反之，則為球面。而表面編號則係指鏡頭10由放大側往縮小側排列之光學元件之表面的排列順序。另外，表一中之半徑及厚度/距離的單位為毫米(mm)。TIR可指全反射棱鏡；CG則可指為玻璃蓋體(Cover glass)。Table 1 describes the values of the optical parameters of each lens in the optical system. The * in the surface number indicates that the surface is an aspheric surface; otherwise, it is a spherical surface. The surface number refers to the order in which the surfaces of the optical elements of the lens 10 are arranged from the magnification side to the reduction side. The unit of radius and thickness / distance in Table 1 is millimeter (mm). TIR may refer to a total reflection prism; CG may refer to a cover glass.

由前述表格可得悉，於本具體實施例中，光學鏡頭1係包括有七片具有屈光度的光學元件，共九片透鏡。而第一透鏡群11中最接近放大側的三片相互鄰接且連續排列的光學元件L1~L3之兩個表面均為非球面表面。而第二透鏡群12中最接近縮小側有屈光度的透鏡之兩個表面均為非球面表面。It can be learned from the foregoing table that, in this specific embodiment, the optical lens 1 includes seven optical elements with refractive power, and a total of nine lenses. The two surfaces of the three optical elements L1 to L3 adjacent to each other and continuously arranged in the first lens group 11 closest to the magnification side are aspherical surfaces. In the second lens group 12, both surfaces of the lens closest to the diopter on the reduction side are aspherical surfaces.

光學元件L1、L7使用非球面設計之用意在於改善系統的畸變量；而將光學元件L2、L3使用非球面之用意在於緩解大光圈設計中，鏡頭系統中會產生的嚴重球面像差(Spherical aberration)與慧差(Coma)。光學元件L5、L6使用膠合透鏡的設計是為了使鏡頭系統達到小的色差。需知悉的是，雙膠合透鏡抗開膠能力較三膠合透鏡佳，且採用兩片雙膠合透鏡時，其總長通常較短，其效益相對較佳。前述之開膠一詞，是指鏡片之間的膠體因溫差劣化而使鏡片掉落之現象。The aspheric design of the optical elements L1 and L7 is intended to improve the distortion of the system; the aspheric design of the optical elements L2 and L3 is intended to alleviate the severe spherical aberration in the lens system in the large aperture design. ) And coma (Coma). The optical elements L5 and L6 are designed with a cemented lens in order to achieve a small chromatic aberration of the lens system. It should be noted that the double cemented lens has better anti-opening capability than the triple cemented lens, and when two double cemented lenses are used, the total length is usually shorter and the benefits are relatively better. The term “opening glue” refers to the phenomenon that the colloid between lenses degrades due to the temperature difference.

另外，於本發明的一觀點中，第二透鏡群12應包括一片阿貝數大於70、80或是90的透鏡。當阿貝數大於70時，其效果已為明顯，而大於80時，效果較佳，而當阿貝數為90以上時，效果最佳。而於第一具體實施例中，第二透鏡群12中的兩片膠合透鏡中的透鏡L51則採用一阿貝數約為94之透鏡以取得較佳的光學品質，惟因阿貝數較高的透鏡成本較一般透鏡高上許多，故設計時應參酌成本決定利用何種級距之透鏡。另外，第一透鏡群最接近該放大側的具有屈光度的透鏡L1之半直徑(Semi Diameter)小於14mm。In addition, in an aspect of the present invention, the second lens group 12 should include a lens having an Abbe number greater than 70, 80, or 90. When the Abbe number is greater than 70, the effect is already obvious, and when it is greater than 80, the effect is better, and when the Abbe number is 90 or more, the effect is the best. In the first specific embodiment, the lens L51 of the two cemented lenses in the second lens group 12 uses a lens with an Abbe number of about 94 to obtain better optical quality, but because the Abbe number is higher The cost of the lens is much higher than that of ordinary lenses, so you should consider the cost when designing the lens with which step. In addition, the semi-diameter of the lens L1 having the refractive power closest to the magnification side of the first lens group is less than 14 mm.

而就本具體實施例中各非球面表面之設計參數，可見表二如下：As for the design parameters of each aspheric surface in this embodiment, Table 2 is as follows:

表二 Table II

而其相對應的運算公式為公式1，如下：-公式(1)The corresponding calculation formula is Formula 1, as follows: -Formula 1)

另外，鏡頭總長在小於100mm時，其效果較佳，總長在90mm以下時更佳，而在約80mm時，其效果最佳。鏡頭總長(TTL)的其中一種計算方法為，由鏡頭於放大側起算第一片具有屈光度的透鏡面向放大側的表面與光軸上的交點，與鏡頭於縮小側起算第一片具有屈光度的透鏡面向縮小側的表面與光軸上的交點之間，兩個交點的距離。而需要時，總長(TTL)的另一計算方法為由鏡頭於放大側起算第一片具有屈光度的邊鏡面向放大側的表面與光軸上的交點，與光閥與光軸交點之間的總長。於第一具體實施例中，鏡頭總長為表面S1至表面S17之間的總距離，為81.147mm。In addition, the effect is better when the total length of the lens is less than 100mm, it is better when the total length is less than 90mm, and it is the best when the total length is about 80mm. One way to calculate the total lens length (TTL) is to calculate the intersection of the first lens with dioptric power from the lens on the magnification side and the intersection of the surface facing the magnification side and the optical axis, and the first lens with diopter from the zoom side The distance between the two intersections between the surface facing the reduction side and the intersection on the optical axis. When needed, another calculation method of total length (TTL) is from the lens on the magnification side to calculate the intersection point of the surface of the first lens with dioptric power facing the magnification side and the optical axis, and the intersection between the light valve and the optical axis. Total length. In the first specific embodiment, the total length of the lens is the total distance between the surface S1 and the surface S17, which is 81.147mm.

另外，在另一觀點中，光學系統之鏡頭總長(TTL)除以有效焦距(EFL)比值小於等於12。然而，若其TTL/EFL之值小於10時，其效果較佳，而當前述比值小於8時，效果最佳。以第一具體實施例為例，其TTL為81.147，而EFL則為12.98，故其二者之比值約為6.25。In addition, in another aspect, the total lens length (TTL) of the optical system divided by the effective focal length (EFL) ratio is 12 or less. However, if the TTL / EFL value is less than 10, the effect is better, and when the aforementioned ratio is less than 8, the effect is best. Taking the first embodiment as an example, the TTL is 81.147 and the EFL is 12.98, so the ratio of the two is about 6.25.

另外，鏡頭的投射比視條件不同，大致為小於3；而在條件較佳時，會在2以下，而於第一具體實施例中，鏡頭的投射比約為1至1.3之間而約為1.24。而就形變量(Optical Distortion)部份，其小於1%時，效果較佳。以第一具體實施例為例，其形變量小於0.25%，而約為0.18。再者，光圈(F/#)值依細部設計的不同而得有所差別，惟光圈值小於等於3.6時較佳，小於等於2.0時更佳，而以第一及第二具體實施例為例，其均約為1.7。In addition, the projection ratio of the lens varies depending on the conditions, which is generally less than 3; and when the conditions are better, it will be less than 2; in the first embodiment, the projection ratio of the lens is about 1 to 1.3 and about 1.24. As for the part of the optical distortion (Optical Distortion), when it is less than 1%, the effect is better. Taking the first specific embodiment as an example, the deformation amount is less than 0.25%, and is about 0.18. In addition, the aperture (F / #) value varies according to the details of the design, but the aperture value is preferably less than or equal to 3.6, and more preferably less than or equal to 2.0, and the first and second specific embodiments are taken as examples. , Which are all about 1.7.

再者，光學鏡頭10的最大視場角(FOV)大於80度時較佳，大於120度時更佳，而以本發明的第一具體實施例中，其最大視場角(FOV)約為140度。Furthermore, the maximum field of view (FOV) of the optical lens 10 is preferably greater than 80 degrees, and more preferably greater than 120 degrees. In the first embodiment of the present invention, the maximum field of view (FOV) is approximately 140 degrees.

依據上述說明可知，本發明實施例提供了一種平衡成本以及性能的光學系統設計，可達到上述的功效。According to the foregoing description, it can be known that the embodiment of the present invention provides an optical system design that balances cost and performance, and can achieve the above-mentioned effects.

雖然本發明已以實施例揭露如上，然其並非用以限定本發明，在不脫離本發明的精神和範圍內，仍可修改或變更，例如改變各群鏡片的片數、調整各鏡片的光學參數(如屈光度，POWER) 或***不影響光學性質的鏡片等，本發明的保護範圍仍以申請專利範圍為準。Although the present invention has been disclosed as above with the examples, it is not intended to limit the present invention. It can still be modified or changed without departing from the spirit and scope of the present invention, such as changing the number of lenses of each group of lenses and adjusting the optics of each lens. For parameters (such as diopter, POWER) or inserting lenses that do not affect the optical properties, the scope of protection of the present invention is still subject to the scope of the patent application.

1‧‧‧光學系統
10‧‧‧光學鏡頭
11‧‧‧第一透鏡群
12‧‧‧第二透鏡群
20‧‧‧光源
30‧‧‧光閥
L1~L7‧‧‧光學元件
L51、L52‧‧‧透鏡
L61、L62‧‧‧透鏡
S‧‧‧光圈
OS‧‧‧放大側
IS‧‧‧縮小側1‧‧‧ optical system
10‧‧‧ Optical lens
11‧‧‧The first lens group
12‧‧‧Second lens group
20‧‧‧ light source
30‧‧‧Light valve
L1 ~ L7‧‧‧Optical Element
L51, L52‧‧‧ lens
L61, L62‧‧‧ lens
S‧‧‧ aperture
OS‧‧‧ Zoom side
IS‧‧‧Reduction side

第1A圖繪示本發明的第一實施例的光學系統之示意圖。FIG. 1A is a schematic diagram of an optical system according to a first embodiment of the present invention.

第1B圖繪示本發明的第一實施例的光學系統中光閥之示意圖。FIG. 1B is a schematic diagram of a light valve in the optical system according to the first embodiment of the present invention.

第2圖繪示本發明的第一實施例的光學鏡頭之示意圖。FIG. 2 is a schematic diagram of an optical lens according to a first embodiment of the present invention.

10‧‧‧光學鏡頭 10‧‧‧ Optical lens

11‧‧‧第一透鏡群 11‧‧‧The first lens group

12‧‧‧第二透鏡群 12‧‧‧Second lens group

30‧‧‧光閥 30‧‧‧Light valve

L1~L7‧‧‧光學元件 L1 ~ L7‧‧‧Optical Element

L51、L52‧‧‧透鏡 L51, L52‧‧‧ lens

L61、L62‧‧‧透鏡 L61, L62‧‧‧ lens

S‧‧‧光圈 S‧‧‧ aperture

OS‧‧‧放大側 OS‧‧‧ Zoom side

IS‧‧‧縮小側 IS‧‧‧Reduction side

Claims

一種光學鏡頭，包括：一第一透鏡群，包括兩片透鏡；一第二透鏡群，包括一第一膠合透鏡及一第二膠合透鏡，該第一膠合透鏡及該第二膠合透鏡分別地由兩片透鏡組合而成，該第二透鏡群包括一片阿貝數大於等於70的透鏡；以及一光圈，設於該第一透鏡群與該第二透鏡群之間；其中，該光學鏡頭的總長(TTL)除以該光學鏡頭的有效焦距(EFL)之比值小於等於10。An optical lens, comprising: a first lens group including two lenses; a second lens group comprises a first cemented lens and a second cemented lens, the first cemented lens and the second lens are respectively made of cemented A combination of two lenses, the second lens group includes a lens with an Abbe number of 70 or more; and an aperture provided between the first lens group and the second lens group; The ratio of (TTL) divided by the effective focal length (EFL) of the optical lens is 10 or less.

如申請專利範圍第1項所述之光學鏡頭，其中，該第一透鏡群為可動對焦群。The optical lens according to item 1 of the scope of patent application, wherein the first lens group is a movable focus group.

如申請專利範圍第1項所述之光學鏡頭，其中，該第一透鏡群包括二相互鄰接的非球面透鏡。The optical lens according to item 1 of the patent application scope, wherein the first lens group includes two aspheric lenses adjacent to each other.

如申請專利範圍第1項所述之光學鏡頭，其中，該第一透鏡群包括三片非球面透鏡。The optical lens according to item 1 of the patent application scope, wherein the first lens group includes three aspherical lenses.

如申請專利範圍第1項所述之光學鏡頭，其中，該阿貝數大於等於70的透鏡之阿貝數大於80。The optical lens according to item 1 of the scope of patent application, wherein the lens having an Abbe number greater than or equal to 70 has an Abbe number greater than 80.

如申請專利範圍第1項所述之光學鏡頭，其中，該第一透鏡群最接近該放大側的具有屈光度的透鏡為一非球面透鏡；以及該第二透鏡群最接近該縮小側的具有屈光度的透鏡為一非球面透鏡。The optical lens according to item 1 of the scope of patent application, wherein the lens having the refractive power closest to the magnification side of the first lens group is an aspheric lens; and the lens having the refractive power closest to the reduction side of the second lens group The lens is an aspheric lens.

如申請專利範圍第1項所述之光學鏡頭，其中，該第一透鏡群最接近該放大側的具有屈光度的透鏡的半直徑(Semi Diameter)小於14。The optical lens according to item 1 of the scope of the patent application, wherein the semi-diameter of the lens having the dioptric power closest to the magnification side of the first lens group is less than 14.

一種光學鏡頭，包括：一第一透鏡群，包含兩片透鏡，該兩片透鏡中包括一非球面透鏡；一第二透鏡群，包含一第一膠合透鏡，該第一膠合透鏡中包括一阿貝數超過70的透鏡；以及一光圈，設於該第一透鏡群及該第二透鏡群之間；其中，該光學鏡頭之光圈值小於等於2，而且該光學鏡頭之最大視場角大於100度。An optical lens includes: a first lens group including two lenses, the two lenses including an aspheric lens; a second lens group including a first cemented lens, the first cemented lens including a lens A lens with a shell number exceeding 70; and an aperture provided between the first lens group and the second lens group; wherein the aperture value of the optical lens is less than or equal to 2 and the maximum field angle of the optical lens is greater than 100 degree.

如申請專利範圍第8項所述之光學鏡頭，其中，該第二透鏡群進一步包括有一第二膠合透鏡，該第二膠合透鏡中包括一阿貝數超過70的透鏡。The optical lens according to item 8 of the patent application scope, wherein the second lens group further includes a second cemented lens, and the second cemented lens includes a lens having an Abbe number exceeding 70.

如申請專利範圍第8項所述之光學鏡頭，其中，該最大視場角大於120度。The optical lens according to item 8 of the scope of patent application, wherein the maximum field angle is greater than 120 degrees.