201028728 六、發明說明： 【發明所屬之技術領域】 本發明係關於一種鏡頭，尤其是一種具有寬廣等效焦 距之攝影鏡頭。 【先前技術】 隨著生活品質提升’喜愛照相的人不僅越來越多，而 且對於照相品質之也越來越講究。一般而言，照相品質隨 ❿著所拍攝的場景、地區、光線、亮度、環境狀態均有關連， 而喜愛照相的人除了需要配合環境而適當取景之外，也需 經常配合取景的需求而更換不同功能效果攝影鏡頭，如廣 角鏡頭（EFL = 6mm)、一般鏡頭（EFL = 7.13mm)、望遠鏡頭 (48mm)等，如此，使照相同好在外出取景拍照時，經常需 要構帶許多種不同功能的鏡頭，造成使用上的不便。201028728 VI. Description of the Invention: TECHNICAL FIELD OF THE INVENTION The present invention relates to a lens, and more particularly to a photographic lens having a wide equivalent focal length. [Prior Art] With the improvement of the quality of life, there are not only more and more people who love photography, but also more and more attention to the quality of photography. In general, the quality of the camera is related to the scene, region, light, brightness, and environmental conditions. The person who likes to take pictures needs to be properly matched with the environment. Different functional effects photographic lenses, such as wide-angle lens (EFL = 6mm), general lens (EFL = 7.13mm), telescope head (48mm), etc., so that when you take pictures out, you often need to construct many different functions. The lens causes inconvenience in use.
【發明内容】 為了解決前述照相f要搭配各種不同效能的鏡頭以執 行不同目的的取景拍攝工作，造成使用不便的技術問題， 本發明係以四組可沿光軸移動的非球面群鏡解決習用技 術使用不便的問題，達到提升使用 配合刖述技術問題及發明目的 焦距攝影鏡頭’其包含包含由物側到像側 設於一光軸之一第一群鏡、一第二群鏡、 第三群鏡以及一第四群鏡，其中： 便利性之目的。 ’本發明提供一種可 依序、互呈間 一孔徑光攔、 變 隔 201028728 5玄第—群鏡固定設於該光軸 度； 其焦距（F G1)具有正屈光 I亥第二群鏡可沿著該光軸移動 光度； 其焦距（FG2)具有負屈 該第三群鏡可沿著該光軸移動光度； 其焦距（F G3)具有正屈 S玄第四群鏡可沿著該光軸移動 光度；以及 其焦距（FG4)具有正屈SUMMARY OF THE INVENTION In order to solve the aforementioned problem that the above-mentioned camera f is matched with lenses of various performances to perform different purposes, which causes inconvenient technical problems, the present invention solves the problem of four sets of aspherical group mirrors that can be moved along the optical axis. The problem of inconvenient use of technology, the use of the focal length photographic lens for improving the use of the technical problem and the purpose of the invention, which comprises a first group mirror, a second group mirror, and a third, which are disposed on the optical axis from the object side to the image side. A group mirror and a fourth group mirror, among which: the purpose of convenience. The present invention provides a second aperture mirror with a positive refractive index and a group of mirrors. The focal length (F G1 ) has a positive refractive index and a second group of mirrors. The luminosity can be moved along the optical axis; the focal length (FG2) has a negative yield; the third group mirror can move the luminosity along the optical axis; and the focal length (F G3) has a positive flexion Optical axis shifts luminosity; and its focal length (FG4) has positive
該孔徑光攔係固定設於該光轴。 其中，該第一群鏡、第二群鏡 鏡之焦距（FGi〜FG4)滿足下列公式： Fci/fw = 4.949 ; 第三群鏡以及第四群 fgi/FG2 = 4.1489 ; Fg2/FG3 = 0.55 ;The aperture stop is fixedly disposed on the optical axis. Wherein, the focal lengths of the first group mirror and the second group mirror (FGi~FG4) satisfy the following formula: Fci/fw = 4.949; the third group mirror and the fourth group fgi/FG2 = 4.1489; Fg2/FG3 = 0.55;
Fg3/FG4 = 0.4 1 7 ; F <3 4 / f τ = 〇 · 6 4 8 ; 其中， fw=6.09 mm，為一廣角模式之焦距；以及 fT = 48.69mm，為一望遠模式之焦距。 其中： FG1 = 30.138mm ； FG2 = -7.264mm ； FG3= 1 3· 1 87mm ;以及 FG4 = 31.5644mm。其中： 201028728 該第一群鏡包含設於該光軸且由物側到像側依序排列 之一第一透鏡、一第二透鏡以及一第三透鏡，其中，該第 一透鏡為一彆月形透鏡，其一凸面朝向物側，其具有負屈 光度；該第二透鏡為一彎月形透鏡，其一凸面朝向物侧且 具有正屈光度；該第三透鏡為—彎月形透鏡，且其一凸面 朝向物側並具有負屈光度，該第一透鏡之一凹面與該第二 透鏡之凸面對應並以黏膠接合黏貼而形成一具有正屈光度 之透鏡； 又Fg3/FG4 = 0.4 1 7 ; F <3 4 / f τ = 〇 · 6 4 8 ; where fw = 6.09 mm, which is the focal length of a wide-angle mode; and fT = 48.69 mm, which is the focal length of a telephoto mode. Where: FG1 = 30.138mm; FG2 = -7.264mm; FG3 = 1 3· 1 87mm; and FG4 = 31.5644mm. Wherein: the first lens includes a first lens, a second lens and a third lens disposed on the optical axis and arranged from the object side to the image side, wherein the first lens is a different month a lens having a convex surface facing the object side and having a negative refracting power; the second lens being a meniscus lens having a convex surface facing the object side and having a positive refracting power; the third lens being a meniscus lens, and a convex surface facing the object side and having a negative refracting power, and a concave surface of the first lens corresponds to the convex surface of the second lens and is adhered by an adhesive bond to form a lens having positive refracting power;
該第二群鏡包含設於該光軸且由物側到像側依序排列 之一第四透鏡、一第五透鏡以及一第六透鏡，該第四透鏡 為一具有負屈光度之彎月形透鏡，其一凸面朝向物側；該 第五透鏡為一具有負屈光度之雙凹透鏡；該第六透鏡為一 具有正屈光度之彎月形透鏡，其一凸面朝向物側；， 該第二群鏡包含設於該光軸且由物側到像側依序排列 之-第七透鏡及一第八透鏡；該第七透鏡為具有正屈光产 之雙凸型非球面透鏡；言玄第八透鏡為具有負屈光度之雙二 型非球面透鏡；以及 該第四群鏡為一補償器，其可包含一設於該光轴之— :九透鏡，其中’胃第九透鏡可為具有正屈光度的雙凸透 藉此 本發明之該可變焦距攝影鏡頭之有效焦 為6.〇9_(W)〜48 69_(丁），使用者僅需攜帶-個 鏡頭即可進行廣角 '望遠的照相工作。 【實施方式】 5 201028728 請參考第一圖以及第二圖，其為本發明之可變焦距攝 影鏡頭的較佳實施例，其包含由物側（object side)到像側 (image side)依序、互呈間隔設於一光軸（50)之一第一群鏡 (10)、一第二群鏡（20)、一第三群鏡（30)以及一第四群鏡 (40) ’其中，該第一群鏡（1〇)係固定設於該光軸（5〇)，該第 * 二群鏡（20)、第三群鏡（30)以及該第四群鏡（40)則均可沿著 該光軸（50)移動。 該第一群鏡（10)的焦距（F G1)具有正屈光度，其包含設 © 於該光軸（50)且由物側到像侧依序排列之一第一透鏡 (12)、一第二透鏡（14)以及一第三透鏡（16)，其中，該第一 透鏡（12)為一彎月形透鏡，其一凸面朝向物側，其具有負 屈光度；該第二透鏡（彳4)亦為一彎月形透鏡，其一凸面同 樣朝向物側且具有正屈光度；該第三透鏡（16)也為彎月形， 且其一凸面朝向物側並具有負屈光度，該第一透鏡（12)之 一凹面與該第二透鏡（14)之凸面對應並以黏膠接合黏貼而 形成—具有正屈光度之透鏡。 ^ 該第二群鏡（2〇)的焦距（FG2)具有負屈光度，其包含設 於該光軸（50)且由物側到像側依序排列之一第四透鏡 (22)、一第五透鏡（24)以及一第六透鏡（26)，該第四透鏡（22) 為一具有負屈光度之彎月形透鏡’其一凸面朝向物側；該 第五透鏡（24)為一具有負屈光度之雙凹透鏡；該第六透鏡 (26)為一具有正屈光度之彎月形透鏡，其—凸面朝向物側。 該第三群鏡（30)的焦距（F g3)具有正屈光度，其包含設 於該光軸（50)且由物側到像側依序排列之一第七透鏡 (32)—第八透鏡（34)，其中’該第七透鏡（32)為具有正屈 6 201028728 光度之雙凸型非球面透鏡；該第八透鏡（34)為具有負屈 度之雙凹型非球面透鏡。 光度，其作為本 設於該光軸（5〇) 有正屈光度的雙 該第四群鏡（40)的焦距（Fg,)具有正屈 較佳實施例之一補償器用途，其可包含一 之一第九透鏡’其中’該第九透鏡可為呈 凸透鏡。 本較佳實施例之該第一〜第四群鏡（1〇、2〇、3〇、4 之焦距（F G1〜F g4)滿足下列公式： β FG1/fw=4.949 ; FG1/FG2 = 4.1489 ；The second group mirror includes a fourth lens, a fifth lens and a sixth lens disposed on the optical axis and sequentially arranged from the object side to the image side, the fourth lens being a meniscus having a negative refracting power a lens having a convex surface facing the object side; the fifth lens being a biconvex lens having a negative refracting power; the sixth lens being a meniscus lens having a positive refracting power, a convex surface facing the object side; and the second group mirror a seventh lens and an eighth lens disposed on the optical axis and sequentially arranged from the object side to the image side; the seventh lens is a biconvex aspheric lens having a positive refractive power; a double-type aspherical lens having a negative refracting power; and the fourth group mirror is a compensator, which may include a nine-lens disposed on the optical axis, wherein the ninth lens of the stomach may have a positive refracting power By double convexly, the effective focus of the variable-focus photographic lens of the present invention is 6.〇9_(W)~48 69_(丁), and the user only needs to carry one lens to perform wide-angle 'looking photography work. [Embodiment] 5 201028728 Please refer to the first figure and the second figure, which are preferred embodiments of the variable focal length photographic lens of the present invention, including from the object side to the image side. The first group mirror (10), the second group mirror (20), the third group mirror (30), and the fourth group mirror (40) are disposed at intervals of one optical axis (50). The first group mirror (1〇) is fixedly disposed on the optical axis (5〇), and the second group mirror (20), the third group mirror (30), and the fourth group mirror (40) are both It can move along the optical axis (50). The focal length (F G1 ) of the first group mirror (10) has a positive refracting power, and includes a first lens (12) disposed on the optical axis (50) and sequentially arranged from the object side to the image side. a second lens (14) and a third lens (16), wherein the first lens (12) is a meniscus lens having a convex surface facing the object side and having a negative refracting power; the second lens (彳4) Also a meniscus lens having a convex surface that also faces the object side and has a positive refracting power; the third lens (16) is also a meniscus shape, and a convex surface thereof faces the object side and has a negative refracting power, the first lens ( 12) One of the concave surfaces corresponds to the convex surface of the second lens (14) and is formed by adhesive bonding - a lens having positive refracting power. ^ The focal length (FG2) of the second group mirror (2〇) has a negative refracting power, and includes a fourth lens (22) disposed on the optical axis (50) and sequentially arranged from the object side to the image side. a fifth lens (24) and a sixth lens (26), the fourth lens (22) being a meniscus lens having a negative refracting power, a convex surface facing the object side; the fifth lens (24) having a negative A diopter double concave lens; the sixth lens (26) is a meniscus lens having a positive refracting power, the convex surface facing the object side. The focal length (F g3) of the third group mirror (30) has a positive refracting power, and includes a seventh lens (32) - an eighth lens disposed on the optical axis (50) and sequentially arranged from the object side to the image side (34), wherein 'the seventh lens (32) is a biconvex aspherical lens having positive yoke 6 201028728 luminosity; the eighth lens (34) is a double concave aspherical lens having a negative degree of flexion. Luminosity, which is a compensator use of a preferred embodiment of the preferred embodiment of the preferred fourth embodiment of the fourth group mirror (40) having positive refractive power, which may be included in the optical axis (5〇). One of the ninth lenses 'where the ninth lens may be a convex lens. In the preferred embodiment, the focal lengths (F G1 〜 F g4 ) of the first to fourth group mirrors (1〇, 2〇, 3〇, 4) satisfy the following formula: β FG1/fw=4.949 ; FG1/FG2 = 4.1489 ;
Fg2/Fq3 = 〇.55 ; FG3/FG4 = 〇-41 7 ； g4^t = 〇-648 ! 其中， fw = 6.09mm ，為本較佳實施例於一廣角模式之焦距 (focal length)； FG1-30.138mm ’為本較佳實施例之第一群鏡之焦距； FG2--7.264mm ’為本較佳實施例之第二群鏡之焦距； Fa-13· 187mm，為本較佳實施例之第三群鏡之焦距； FG4 = 31 ·5644mm，為本較佳實施例之第四群鏡之焦 距； T=48,69mm，為本較佳實施例於一望遠模式之焦距； 其中’本較佳實施例之該第二群鏡（20)以及該第三群 鏡（3〇)之間包含一孔徑光攔（60)，該孔徑光攔（60)固定設於 光抽（50)’且其距離於一成像面（7〇)之距離保持不變。其 7 201028728 中，本較佳實施例之該成像面（70)之厚度為2.4mm，其可 包含一感應器保g蒦玻璃（Sensor Cover Glass)及一紅外線;慮 鏡（IR Filter)之厚度的厚度，實際之成像位置可能於第一圖 中所標示之該成像面（70)後方oj5mm的位置。 請參考第二圖〜八圖，其為本較佳實施例之光學效能 模擬結果’其中’第二圖為光路徑模擬示意圖；第三A〜f 圖以及第四A〜F圖均為不同視場角度的橫向光扇圖 (Transverse Ray Fan Plots)模擬結果；第五圖以及第六圖 ® 為本較佳實施例之場曲圖及畸變圖；第七圖為本較佳實施 例之視場對應至0〜125Lp/mm空間頻率（spatial frequency) 所產生的调制傳遞函數圖（modulation transfer function); 第八圖為本較佳實施例之全視場對應〇視場所產生的相對 照度（relative illumination)模擬結果圖。 使用時’當本較佳實施例於一廣角模式變焦至一望遠 模式時’該第一群鏡（10)保持不動，該第二群鏡(20)則從物 側往像側方向移動而與該第一群鏡（2〇)之相對距離加大， Ο 該第三群鏡（30)則從像侧朝物側方向移動而與該第二群鏡 (20)之相對距離縮小’該第四群鏡（4〇)則從物側朝向該像側 移動而與該第三群鏡之相對距離縮小。如此，本較佳實施 例之有效焦距長度（EFL)為6.09mm(W)〜48_69mm(T)，有 效的口徑F/NO則可於3 1(vv)〜5_1(T)之間變換，達到一 鏡多用，解決先前技術的問題。 【圖式簡單說明】 8 201028728 第一圖為本較佳實施例之分解示意圖。 第二圊為本較佳實施例之光路徑模擬示意圖。 第二A〜F圖為本較佳實施例之不同視場角度的橫向光 • 扇圖（Transverse Ray Fan Plots)模擬結果圖。 第四A〜F圖為本較佳實施例之另一不同視場角度的橫 向光扇圖模擬結果圖。 第五A、B圖為本較佳實施例之場曲圊及畴變圖。 第六A、B圖為本較佳實施例之另一場曲圖及畸變圖。 ® 第七A、B圖為本較佳實施例之調制傳遞函數模擬結果 圖。 第八A、B圖為本較佳實施例之全視場對應〇視場之 相對照度模擬結果圖。 【主要元件符號說明】 (10)第一群鏡 (30)第三群鏡 (12)第一透鏡 (32)第七透鏡 (14)第二透鏡 (3 4)第八透鏡 (16)第三透鏡 (40)第四群鏡 (20)第二群鏡 (50)光軸 (22)第四透鏡 (60)孔徑光欄 (24)第五透鏡 (7 0)成像面 (26)第六透鏡 9Fg2/Fq3 = 〇.55 ; FG3/FG4 = 〇-41 7 ; g4^t = 〇-648 ! where fw = 6.09mm is the focal length of a preferred embodiment in a wide-angle mode; FG1 -30.138mm ' is the focal length of the first group of mirrors of the preferred embodiment; FG2 - 7.264mm ' is the focal length of the second group of mirrors of the preferred embodiment; Fa-13 · 187mm, which is the preferred embodiment The focal length of the third group of mirrors; FG4 = 31 · 5644 mm, which is the focal length of the fourth group of mirrors of the preferred embodiment; T = 48, 69 mm, which is the focal length of a preferred embodiment in a telephoto mode; In the preferred embodiment, the second group mirror (20) and the third group mirror (3〇) comprise an aperture stop (60), and the aperture stop (60) is fixedly disposed on the light pumping (50)' And the distance from an imaging surface (7 〇) remains unchanged. In 7 201028728, the imaging surface (70) of the preferred embodiment has a thickness of 2.4 mm, which may include a sensor cover glass and an infrared; the thickness of the IR filter The thickness of the actual imaging position may be oj5 mm behind the imaging surface (70) indicated in the first figure. Please refer to FIG. 2 to FIG. 8 , which are optical performance simulation results of the preferred embodiment, wherein the second diagram is a schematic diagram of the optical path simulation; the third A to f diagram and the fourth A to F diagrams are different views. Transverse Ray Fan Plots simulation results of field angles; fifth and sixth diagrams are field curvature diagrams and distortion diagrams of the preferred embodiment; seventh diagram is the field of view of the preferred embodiment Corresponding to a modulation transfer function generated by a spatial frequency of 0 to 125 Lp/mm; the eighth figure is a relative illumination generated by the full field of view corresponding to the gaze place of the preferred embodiment (relative illumination) ) Simulation result graph. In use, when the preferred embodiment zooms to a telephoto mode in a wide-angle mode, the first group mirror (10) remains stationary, and the second group mirror (20) moves from the object side to the image side direction. The relative distance between the first group of mirrors (2〇) is increased, and the third group mirror (30) is moved from the image side toward the object side and the relative distance from the second group mirror (20) is reduced. The four groups of mirrors (4 turns) move from the object side toward the image side and the relative distance from the third group mirror is reduced. Thus, the effective focal length (EFL) of the preferred embodiment is 6.09 mm (W) to 48_69 mm (T), and the effective aperture F/NO can be changed between 3 1 (vv) and 5_1 (T). A mirror is used to solve the problems of the prior art. BRIEF DESCRIPTION OF THE DRAWINGS 8 201028728 The first figure is an exploded view of the preferred embodiment. The second embodiment is a schematic diagram of the optical path simulation of the preferred embodiment. The second A to F diagrams are simulation results of the transverse ray of the different angles of view of the preferred embodiment of the Transverse Ray Fan Plots. The fourth A to F diagrams are diagrams showing the results of the transverse light fan pattern simulation of another different field of view angle of the preferred embodiment. The fifth and fourth figures are the field curvature and domain variation diagrams of the preferred embodiment. The sixth and fourth figures are another scene and distortion diagram of the preferred embodiment. ® Figure 7A, B is a simulation result of the modulation transfer function of the preferred embodiment. The eighth and fourth graphs are the results of the simulation results of the full field of view corresponding to the gaze field of the preferred embodiment. [Description of main component symbols] (10) First group mirror (30) Third group mirror (12) First lens (32) Seventh lens (14) Second lens (3 4) Eighth lens (16) Third Lens (40) fourth group mirror (20) second group mirror (50) optical axis (22) fourth lens (60) aperture diaphragm (24) fifth lens (70) imaging surface (26) sixth lens 9