M324797 八、新型說明： 【新型所屬之技術領域】 本創作係有關於一雙焦點鏡頭及具有該鏡頭之電子 裝置，尤指一種適用於手機相機上，且不需任何主動元件 Λ 便能提供雙焦點的鏡頭裝置者。 【先前技術】 φ 隨著科技時代的日新月異，各式各樣的隨身資訊電子 產品以及設備因應而生，而各式的產品零組件均朝著輕薄 短小的目標邁進。如何使產品更具人性化，多機一體的概 念’體積縮小攜帶方便符合人因工程，更合乎消費者便利 - 追求時尚的需求，是目前市場主要的課題之一。而將手機 一 結合數位相機功能甚至將筆記型電腦以及個人數位助理 (pda)均結合數位相機功能，即是其中一項重要之改良 突破。 • 觀察目前市售所有手持式電子裝置（例如手機等）， Λ 可以發現都朝向微型化路線去發展。尤其是具有相機功能 之手機’更是當紅的機種。現在的相機手機更結合了 3G 功能，運用網路影像電話令使用者雙方皆能以影像溝通。 因此’未來的手機的路線將會是多元化且全功能的配備， 甚至可能取代傳統的數位相機，成為結合照像、通訊、上 網等，具有多功能之整合機種。然而，目前的手機相機主 疏仍是以定焦為主，因此近拍時常會發生模糊不清的現 象’尤其在名片辨識的應用上絕對需要兩段式的對焦。例 5 M324797 如，圖一所示為傳統僅具有定焦功能之鏡頭10的鏡片群 示意圖。一般來說，相機鏡頭10都是由複數片鏡片所紐 合構成，且最接近物像（object)之第一片鏡片前方表面 通常稱為第一表面11，而最接近成像面之最末片鏡片後 方表面則稱為最末表面12。由於傳統定焦鏡頭的鏡片群 僅能提供單一焦距之清晰成像，因此，如圖二之解調轉換 函數（Modulation Transfer Function，簡稱 MTF)測試曲 線圓所示，在以光圈居前之200萬畫素鏡頭為例且使用如 圖一所示之傳統定焦鏡頭來進行測試時，可發現只有在準 焦（橫轴之Focus Shift值等於0)區域附近才能得到最大 之光學轉換函數（Optical Transfer Function，簡稱 0TF) 波峰值（約0·7)，也就是得到清晰成像，而其他區域則會 失焦以致無法得到清晰影像。 目前的習知技術雖然有採用驅動鏡頭内之鏡片群移 動來進行兩段式變焦的對焦馬達技術，例如：音圈馬達、 步進馬達、壓電馬達等等，但是增加馬達後的鏡頭成本及 雜積均明顯增加，而仍有進一步改善的空間。 【新型内容】 本創作之第一目的，在於提供一種雙焦點鏡頭及具有 該鏡頭之電子裝置，只需以一個鏡頭組，在焦距一與焦距 一皆可清楚成像，且不需要移動鏡頭的任一鏡片與後焦， 即可達到雙焦點效果。 本創作之雙焦點鏡頭的最大特色在於不需主動元 6 M324797 件，即可達到遠拍近拍皆清晰之目的，解決目前使用馬達 來驅動鏡片群所增加的成本與體積問題。 為達上述之目的，本創作揭露一種雙焦點鏡頭及具有 該鏡頭之電子裝置。該雙焦點鏡頭係由包括一光圈及至少 兩鏡片所構成，並在較接近光圈之鏡片上設置一第一透射 區域及一第二透射區域。在不移動任何鏡片的前提之下， 在第一物距之影像可以藉由第一透射區域而清晰成像在 一固定位置的成像面上、而在第二物距之影像則可藉由第 二透射區域而成像相同之成像面上，因此達到不需任何主 動元件且不需改變成像距離即可提供雙焦距的目的。該第 一與第二透射區域之具體結構的實施例，可以是在鏡片之 中心與外圍設置不同肉厚或曲率之透鏡結構、或是增加一 片玻璃隔在鏡片之中央或外圍區域以實質改變肉厚、或是 在鏡片中央或外圍區域設置菲涅爾聚焦透鏡（Fresnel Lens)來變化曲率等等。M324797 VIII. New Description: [New Technology Field] This creation is about a dual focus lens and an electronic device with the lens, especially one suitable for mobile phone cameras, and can provide double without any active components. Focus lens mounter. [Prior Art] φ With the rapid development of the technology era, a variety of portable information electronic products and equipment have emerged, and all kinds of product components are moving toward a light, short and short goal. How to make the product more humane, the concept of multi-machine integration ‘the size is reduced, the carrying capacity is convenient to meet the human factor engineering, and it is more convenient for consumers. The pursuit of fashion is one of the main topics in the market. Combining a mobile phone with a digital camera function and even combining a notebook computer and a personal digital assistant (pda) with digital camera functionality is one of the important improvements. • Observe all commercially available handheld electronic devices (such as cell phones, etc.), and you can find that they are all moving toward miniaturization. Especially the mobile phone with camera function is a popular model. Nowadays, the camera phone is combined with the 3G function, and the network video phone allows both users to communicate with each other. Therefore, the future mobile phone route will be diversified and fully functional, and may even replace the traditional digital camera, and become a multi-functional integrated machine that combines photography, communication, and online. However, the current mobile phone camera is still dominated by fixed focus, so the ambiguity often occurs in close-ups. In particular, two-stage focusing is absolutely required for business card recognition applications. Example 5 M324797 For example, Figure 1 shows a schematic view of a lens group of a conventional lens 10 having only a fixed focus function. In general, the camera lens 10 is composed of a plurality of lenses, and the front surface of the first lens closest to the object is generally referred to as the first surface 11, and the closest to the imaging surface. The rear surface of the lens is referred to as the last surface 12. Since the lens group of the conventional fixed-focus lens can only provide clear imaging with a single focal length, as shown in the test curve circle of the Modulation Transfer Function (MTF) in Fig. 2, the 2 million paintings in the front of the aperture For example, when using a conventional fixed-focus lens as shown in Figure 1, it can be found that the maximum optical transfer function can be obtained only in the vicinity of the quasi-focus (the Focus Shift value of the horizontal axis is equal to 0) (Optical Transfer Function). , abbreviated as 0TF) The peak value (about 0·7), that is, the clear image is obtained, while the other areas are out of focus so that a clear image cannot be obtained. The current conventional technology has a focus motor technology that uses a lens group movement in a driving lens to perform two-stage zooming, such as a voice coil motor, a stepping motor, a piezoelectric motor, etc., but increases the lens cost after the motor and The allografts are significantly increased, and there is still room for further improvement. [New content] The first purpose of this creation is to provide a bifocal lens and an electronic device having the same, which can be clearly imaged by one lens group at a focal length and a focal length, and does not require any movement of the lens. A lens and back focus can achieve a double focus effect. The biggest feature of the bifocal lens of this creation is that it does not require the active element 6 M324797, which can achieve the purpose of clearing the far-shooting close-up, and solve the cost and volume problem of using the motor to drive the lens group. For the above purposes, the present invention discloses a bifocal lens and an electronic device having the same. The dual focus lens is composed of an aperture and at least two lenses, and a first transmission area and a second transmission area are disposed on the lens closer to the aperture. Under the premise of not moving any lens, the image at the first object distance can be clearly imaged on the imaging surface of a fixed position by the first transmission area, and the image at the second object distance can be second by the image. The transmission area is imaged on the same imaging surface, thus achieving the goal of providing a double focal length without any active components and without changing the imaging distance. The specific structure of the first and second transmissive regions may be a lens structure having different flesh thickness or curvature at the center and the periphery of the lens, or adding a piece of glass to the central or peripheral region of the lens to substantially change the flesh. Thick, or Fresnel Lens in the center or peripheral area of the lens to change the curvature and so on.
【實施方式】 為了能更清楚地描述本創作所提出之雙焦點鏡頭及 具有該鏡頭之電子裝置，以下將配合圖示詳細說明之。 請參閱圖三所示，其係為本創作之雙焦點鏡頭20之 一較佳實施例的示意圖。本創作之雙焦點鏡頭20係包括 有由複數鏡片所構成之一鏡片群21、以及一中空鏡頭座 22用以容置與定位各鏡片於其内。該雙焦點鏡頭2〇可將 一物像91之影像光清晰成像在一成像面92上。該成像面 7 M324797 92可以是一影像感測晶片的作動面（Active Side)，其可 以將物像之影像光轉換成可供電腦判讀之電氣訊號，以達 到相機之功能。於本創作中，該影像感測晶片的具體實施 例可以是電荷搞合裝置（charge coupled device，CCD )或 互補式金屬氧化半導體（complementary metal oxide semiconductor，CMOS)等。並且，具有本創作之雙焦點 鏡頭20的相機因為體積很小，所以很適合被裝置在手持 式電子裝置上，例如但不侷限於手機或個人數位助理等。 於本實施例中，在鏡頭座22之前端側也就是最接近 物像之侧設有一光圈221其係對應於各鏡片所構成之鏡 片群21，並且，在最接近光圈221之鏡片（例如第一鏡 片）的表面211 (例如第一表面）上設置了 一第一透射區 域2111及一第二透射區域2112。該第一與第二透射區域 2111、2112是藉由在該鏡片表面211上設置至少兩種不 同的物理結構，例如但不侷限於：改變鏡片的肉厚或曲率 等，以達到在同一鏡片表面211的不同區域2111、2112 提供光程差（光程長不同，也就是提供不同放大倍率）的 目的。如圊一所示之實施例中，該第一與第二透射區域 2111、2112乃是依同心圓狀設置，第一透射區域21U是 位在鏡片的較外圍區域（外圈）且具有較小放大倍率、而 第二透射區域2112則是位在鏡片的中心區域（内圈）且 具有較大放大倍率。 如圖三之上半部所示，當物像91是位在一普通 (Normal)距離（或稱為第一物距）的位置處時，例如物 8 M324797 像91與本創作雙焦點鏡頭2〇是相距數公尺以上的距離 時’大部分從物像91所反射來的影像光911都會經由光 圈221以及鏡片之第一透射區域2111進入鏡頭2〇内並清 晰成像在成像面92上。又如圖三之下半部所示，當物像 91是位在一微距（Macro)(或稱為第二物距）的位置處 時，例如物像91與本創作雙焦點鏡頭20是相距數十公分 以内的距離時，大部分從物像91所反射來的影像光912 φ 都會經由光圈221以及鏡片之第二透射區域2112進入鏡 頭20内並清晰成像在同一成像面92上。如此一來，本創 作之雙焦點鏡頭20完全不需移動任何鏡片、也不需改變 成像面92的位置或距離，即可在兩種不同的物像位置均 、 提供清晰成像的功能。 請參閱圖四，為本創作雙焦點鏡頭30中設置有第一 及第二透射區域之鏡片的第一實施例示意圖。本創作之鏡 片構成前述第一及第二透射區域31、32的具體結構的第 _ 一實施例，可如圖四所示，係在最接近光圈之鏡片的前表 面上設置不同的鏡片肉厚，亦即，在第一透射區域(鏡 片外圈）的肉厚較薄、而在第二透射區域32 (鏡片内圈） 的肉厚較厚。如此一來，便可達到在單一鏡頭3〇中獲得 兩種不同放大倍率（光程差）的功效。如圓五所示，其係 為以光圈居前之200萬畫素鏡頭為例且與圖二所示之相 同測試條件下，使用如圖四所示之本創作雙焦點鏡頭3〇 所測試得到的MTF賴曲線圖。如圖五所示，很明顯地， 本創作雙焦點鏡頭30可以產生兩組波峰值在不同位置 9 M324797 上’也就是在該兩位置上都可以獲得清晰成像。雖然，當 物像位在普通距離時，除了透過第一透射區域31的影像 光可以被清晰成像在成像面上之外，也會有部分影像光經 過第二透射區域32而照射在成像面上。然而，由圖五之 MTF測試曲線圖可知，當在橫轴之F〇cus Shift值約等於 〇的附近區域時，由第一透射區域31所清晰成像之影像 光可以有最大OTF波峰值（約〇·55)，而同時透過第二透 射區域32而來之非聚焦光的0TF值則僅有約〇 〇3左右， 因此對於影像品質影響不大。相對地，當物像是位在微距 的距離時，也會有類似的結果；亦即，透過第二透射區域 32之清晰成像影像光的〇tf波峰值為約〇·4，而同時透 過第一透射區域31之非聚焦光的〇TF值則接近〇左右。 對於例如相機手機之類對於影像品質要求遠低於小型化 與平價化要求的手持式電子裝置來說，本創作之雙焦點鏡 頭30所提供的成像品質是可以被大部分消費者所接受 的。 於一較佳實施例中，本創作之雙焦點鏡頭之鏡片的第 一與第二透射區域的設定較佳值可由如下方式計算： 1·依照趨勢，將第一與第二透射區域兩者的分段位 置設計在1/5〜3/4最大光圈值的位置是本創作可實施的範 園、且在1/4〜1/2最大光圈值的位置則是最佳實施態樣的 區域，如此不僅可以達到較完美的MTF雙波峰曲線，亦 可兼顧影像品質與亮度°例如，假設Di是第二透射區域 (内圈）的外徑，且Do是第一透射區域（外圈）的最大 M324797 外徑（或是最大光圈值）時，則l/5Do<Di<3/4Do是本創 作的可實施範圍、而l/4Do<Di<l/2Do則為本創作之最佳 實施例範圍。 2·該第一與第二透射區域的較佳設置位置，應該是 位在最接近光圈之前或後方的鏡片表面為最佳，如此，影 像光之光束可較集中通過該第一與第二透射區域。例如， 倘若光圈在鏡頭内的位置為Si、同時該第一與第二透射區 域所在的鏡片表面位置為Sj時，則|i_j|<=3時係為本創作 籲 的可實施範圍、而當|i-j|<=2時則為本創作之最佳實施態 樣。 ^ 清參閱圖六與圖七’其分別為如圖四所示之本創作雙 焦點鏡頭30在微距與普通距離時的光路模擬圊。如圖六 - 所示，當物像在微距距離（近拍）時，影像不同視場光 (objective field) 913〜916，因(視場不同），而在經過鏡片第 二透鏡區域32後成像在成像面92之不同位置上。而當物 像在普通距離（遠拍）時，如圖七所示，則不同視場光 Φ 913〜916在經過鏡片的第一透射區域31後將會被聚焦（成 像）在成像面92之不同位置上。 請參閱圖八，為本創作雙焦點鏡頭40中設置有第— 及第二透射區域之鏡片41的第二實施例示意囡。本第二 實施例是以130萬畫素鏡頭為例，且其光圈93的位置是 設在鏡頭40之複數鏡片4卜42之間。此時，本創作雙焦 點鏡頭40，是在光圈93前方（左侧）的鏡片41表面411 上設置如前述之第一透射區域與第二透射區域。其中，本 M324797 創作雙焦點鏡頭40之第二實施例的光路模擬圖係如圖八 所示，而MTF測試曲線圖則如圖九所示。由圖九可知， 即使鏡頭40之光圈93是設在各鏡片41、42之間時，本 創作之雙焦點鏡頭40同樣可以得到雙波峰也就是雙焦距 的功效。 請參閱圖十，為本創作雙焦點鏡頭中設置有第一及第 二透射區域之鏡片的第三實施例示意圖。於該鏡片50的 左側表面51 (通常是較接近光圈側）的外圈是第一透射 區域511且具有相對較小之肉厚，以便使位在普通距離 (遠拍）的物像影像光可被清晰成像在成像面上。相對 地，鏡片50的内圈則是第二透射區域512且具有相對較 大之肉厚，使得第二透射區域512與第一透射區域511之 間產生一光程差，以便使位在微距（近拍）的物像影像光 可被清晰成像在成像面上。於本實施例中，該第一及第二 透射區域51卜512係以同心圓的方式設在同一鏡片5〇的 同一側表面51上且兩者曲率（亦即光學面係數）相同。 此外，在鏡片50的最外圍並設有環狀的定位結構52，以 供嵌合及定位在如圖三所示之鏡頭座22中。 請參閱圖Η，為本創作雙焦點鏡頭中設置有第一及 第二透射區域之鏡片50a的第四實施例示意圖。於本實施 倒中，位在鏡片50a外圈的第一透射區域511a是具有相 對較大之肉厚且可供微距（近拍）的物像清晰成像，同時， 鏡片50a内圈的第二透射區域512a則具有相對較小之肉 厚且可供普通距離（遠拍）的物像清晰成像。 M324797 在圖中未示之另一實施例中，内圈第二透射區域的光 學面係數（例如曲率）可重新設計，使内、外圈的厚度相 近但卻具有不同的光學面係數，藉由第一與第二透射區域 的不同光學面係數仍可產生雙焦點的效果，然而，此種設 計通常還是會因曲率半徑的不同而產生肉厚上之變化。 請參閱圖十二，為本創作雙焦點鏡頭中設置有第一及 第二透射區域之鏡片的第五實施例示意圏。於本實施例 中，位在鏡片50b外圈的第一透射區域5llb是具有一般 光學面係數（曲率）以供普通距離（遠拍）的物像清晰成 像，而在鏡片内圈的第二透射區域512b則是藉由使用菲 涅爾聚焦透鏡（Fresnel Lens)設計，在類似的厚度下來 改變光學面係數（曲率）以供微距（近拍）的物像清晰成 像，並使内、外圈厚度相近以減少斷差。 請參閱圖十三，為本創作雙焦點鏡頭中設置有第一及 第二透射區域之鏡片50c的第六實施例示意圖。於本實施 例中，位在鏡片50c外圈的第一透射區域5iic是使用菲 埋爾聚焦透鏡（Fresnel Lens)設計以提供較大放大倍率， 以供微距（近拍）的物像清晰成像；同時，在鏡片5ic 内圈的第二透射區域512c則是一般透鏡面之設計以供普 通距離（遠拍）的物像清晰成像，且鏡片5ie内、外圈厚 度相近以減少斷差。 請參閱圖十四，為本創作雙焦點鏡頭中設置有第一及 第二透射區域之鏡片的第七實施例示意圖。於本實施例 中’主要是在各鏡片61、62之間且鄰近光圈的位置處增 13 M324797 設置-透明薄板解_ a (修平板玻璃）。該薄板 學材料63的内圈裸空從，該内圈裸空咖與外圈 板光學材料兩者實質上係造成—厚度差的效果，使得通過 内圈裸空632區域（亦即第二透射區域）與外圈薄板材料 631區域（第-透射區域）的影像光可具有不同光程長， 而同樣具有雙焦點的效果。 以上所述係利用較佳實施例詳細說明本創作，而非限 制本創作之範園。大凡熟知此類技藝人士皆能明瞭，適當 而作些微敝變及調整，仍將不失本創作之要義所在，亦 不脫離本創作之精神和範圍。 【圖式簡單說明】 圖一為傳統僅具有定焦功能之鏡頭的鏡片群示意圖。 圖二為如圖一所示之傳統定焦鏡頭的MTF測試曲線圖。 圖三為本創作之雙焦點鏡頭之一較佳實施例的示意圖。 圖四為本創作雙焦點鏡頭中設置有第一及第二透射區 域之鏡片的第一實施例示意圖。 圖五為如圊四所示之本創作雙焦點鏡頭的MTF測試曲 線圖。 圖六為如圖四所示之本創作雙焦點鏡頭在微距距離時 的光路模擬圖。 圖七為如圖四所示之本創作雙焦點鏡頭在普通距離時 的光路模擬圖。 圖八為本創作雙焦點鏡頭中設置有第一及第二透射區 M324797 域之鏡片的第二實施例示意圖。 圖九為如圖八所示之本創作雙焦點鏡頭的MTF測試曲 線圖。 圖十為本創作雙焦點鏡頭中設置有第一及第二透射區 域之鏡片的第三實施例示意圖。 圖十一為本創作雙焦點鏡頭中設置有第一及第二透射 區域之鏡片的第四實施例示意圖。 圖十二為本創作雙焦點鏡頭令設置有第一及第二透射 區域之鏡片的第五實施例示意圖。 圖十三為本創作雙焦點鏡頭中設置有第一及第二透射 區域之鏡片的第六實施例示意圖。 圖十四為本創作雙焦點鏡頭令設置有第一及第二透射 區域之鏡片的第七實施例示意圖。 【主要元件符號說明】 10〜習知鏡頭 11〜第一表面[Embodiment] In order to more clearly describe the bifocal lens proposed by the present invention and the electronic device having the same, the following will be described in detail with reference to the drawings. Referring to FIG. 3, it is a schematic diagram of a preferred embodiment of the bifocal lens 20 of the present invention. The bifocal lens 20 of the present invention includes a lens group 21 composed of a plurality of lenses, and a hollow lens holder 22 for accommodating and positioning the lenses therein. The bifocal lens 2 清晰 can clearly image the image light of an object image 91 on an imaging surface 92. The imaging surface 7 M324797 92 can be an active side of an image sensing chip, which can convert the image light of the object image into an electrical signal that can be interpreted by the computer to achieve the function of the camera. In the present invention, a specific embodiment of the image sensing chip may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). Moreover, the camera having the bifocal lens 20 of the present invention is very suitable for being mounted on a handheld electronic device because of its small size, such as, but not limited to, a mobile phone or a personal digital assistant. In the present embodiment, a front aperture side of the lens holder 22, that is, a side closest to the object image, is provided with an aperture 221 corresponding to the lens group 21 formed by each lens, and a lens closest to the aperture 221 (for example, A first transmissive region 2111 and a second transmissive region 2112 are disposed on a surface 211 (eg, a first surface) of a lens. The first and second transmissive regions 2111, 2112 are formed on the lens surface 211 by at least two different physical structures, such as, but not limited to, changing the flesh thickness or curvature of the lens to achieve the same lens surface. Different regions 2111, 2112 of 211 provide the purpose of optical path difference (different optical path lengths, that is, providing different magnifications). In the embodiment shown in FIG. 1, the first and second transmissive regions 2111, 2112 are concentrically arranged, and the first transmissive region 21U is located in a relatively peripheral region (outer ring) of the lens and has a smaller The magnification, while the second transmission region 2112 is located in the central region (inner circle) of the lens and has a large magnification. As shown in the upper half of Fig. 3, when the object image 91 is at a position of a normal distance (or a first object distance), for example, the object 8 M324797 is like the 91 and the present bifocal lens 2 When 〇 is a distance of several meters or more, most of the image light 911 reflected from the object image 91 enters the lens 2 through the aperture 221 and the first transmission area 2111 of the lens and is clearly imaged on the imaging surface 92. As shown in the lower half of FIG. 3, when the object image 91 is located at a position of a macro (or a second object distance), for example, the object image 91 and the present bifocal lens 20 are When the distance is within tens of centimeters, most of the image light 912 φ reflected from the object image 91 enters the lens 20 via the aperture 221 and the second transmission area 2112 of the lens and is clearly imaged on the same imaging surface 92. In this way, the dual focus lens 20 of the present invention can provide clear imaging functions in two different object positions without moving any lenses or changing the position or distance of the imaging surface 92. Referring to FIG. 4, a first embodiment of a lens in which the first and second transmissive regions are disposed in the bifocal lens 30 of the present invention is shown. The lens of the present invention constitutes a first embodiment of the specific structure of the first and second transmissive regions 31, 32, as shown in FIG. 4, which is provided with different lens flesh thickness on the front surface of the lens closest to the aperture. That is, the thickness of the first transmission area (the outer circumference of the lens) is thin, and the thickness of the second transmission area 32 (the inner circumference of the lens) is thick. In this way, it is possible to achieve two different magnifications (optical path differences) in a single lens. As shown in Figure 5, it is based on the 2 million pixel lens with the aperture in the front and is tested under the same test conditions as shown in Figure 2, using the original bifocal lens shown in Figure 4. The MTF depends on the graph. As shown in Fig. 5, it is apparent that the present bifocal lens 30 can produce two sets of wave peaks at different positions 9 M324797', that is, clear imaging can be obtained at both positions. Although, when the object image is at a normal distance, the image light transmitted through the first transmission region 31 can be clearly imaged on the imaging surface, and part of the image light is irradiated on the imaging surface through the second transmission region 32. . However, from the MTF test graph of FIG. 5, when the F〇cus Shift value on the horizontal axis is approximately equal to the vicinity of 〇, the image light clearly imaged by the first transmission region 31 may have the largest OTF peak value (about 〇·55), while the 0TF value of the unfocused light transmitted through the second transmissive area 32 is only about 〇〇3, so it has little effect on the image quality. In contrast, when the object image is at a distance of a macro, there is a similar result; that is, the peak value of the 〇tf wave of the clear image light transmitted through the second transmission region 32 is about 〇·4 while being transmitted through The 〇TF value of the unfocused light of the first transmission region 31 is close to 〇. For handheld electronic devices such as camera phones that require image quality that is much lower than miniaturization and parity, the imaging quality provided by the bifocal lens 30 of this creation is acceptable to most consumers. In a preferred embodiment, the preferred values for the first and second transmission regions of the lens of the bifocal lens of the present invention can be calculated as follows: 1. According to the trend, both the first and second transmission regions are The position of the segment position at the maximum aperture value of 1/5 to 3/4 is the area where the creation can be implemented, and the position of 1/4 to 1/2 of the maximum aperture value is the best implementation. In this way, not only can a perfect MTF double peak curve be achieved, but also image quality and brightness can be considered. For example, it is assumed that Di is the outer diameter of the second transmission region (inner ring), and Do is the maximum of the first transmission region (outer ring). M324797 outer diameter (or maximum aperture value), then l/5Do<Di<3/4Do is the implementable range of the creation, and l/4Do<Di<l/2Do is the best embodiment range of the creation . 2. The preferred position of the first and second transmissive regions should be the surface of the lens that is located before or behind the aperture, so that the beam of image light can be concentrated through the first and second transmissions. region. For example, if the position of the aperture in the lens is Si and the position of the surface of the lens where the first and second transmission regions are located is Sj, then |i_j|<=3 is the executable range of the creation, and When |ij|<=2, it is the best implementation of this creation. ^ See Fig. 6 and Fig. 7' respectively, which are the optical path simulations of the original bifocal lens 30 at the macro and normal distance as shown in Fig. 4. As shown in Figure 6 - when the object image is at the macro distance (macro), the image is different from the objective field 913 to 916, because (the field of view is different), and after passing through the second lens area 32 of the lens. The images are imaged at different locations on the imaging surface 92. When the object image is at a normal distance (far shot), as shown in FIG. 7, the different field of view light Φ 913 916 916 will be focused (imaged) on the imaging surface 92 after passing through the first transmission area 31 of the lens. In different locations. Referring to FIG. 8, a second embodiment of the lens 41 in which the first and second transmission regions are disposed in the bifocal lens 40 of the present invention is shown. The second embodiment is exemplified by a 1.3 million pixel lens, and the position of the aperture 93 is set between the plurality of lenses 4 and 42 of the lens 40. At this time, the present bifocal point lens 40 is provided with the first transmissive area and the second transmissive area as described above on the surface 411 of the lens 41 in front of (the left side) of the aperture 93. The optical path simulation diagram of the second embodiment of the M324797 creation bifocal lens 40 is shown in FIG. 8, and the MTF test curve diagram is shown in FIG. As can be seen from Fig. 9, even if the aperture 93 of the lens 40 is disposed between the lenses 41 and 42, the bifocal lens 40 of the present invention can also obtain the effect of double peaks or double focal lengths. Please refer to FIG. 10, which is a schematic view of a third embodiment of a lens in which the first and second transmission regions are disposed in the bifocal lens of the present invention. The outer ring of the left side surface 51 of the lens 50 (usually closer to the aperture side) is the first transmissive area 511 and has a relatively small flesh thickness so that the object image light at a normal distance (telephoto) can be It is clearly imaged on the imaging surface. In contrast, the inner ring of the lens 50 is the second transmissive region 512 and has a relatively large flesh thickness such that an optical path difference is generated between the second transmissive region 512 and the first transmissive region 511 so as to be positioned in the macro. The object image light (near shot) can be clearly imaged on the image plane. In the present embodiment, the first and second transmitting regions 51 are arranged concentrically on the same side surface 51 of the same lens 5'' and the curvatures (i.e., optical surface coefficients) are the same. In addition, an annular positioning structure 52 is provided on the outermost periphery of the lens 50 for fitting and positioning in the lens mount 22 as shown in FIG. Referring to the figure, a fourth embodiment of the lens 50a having the first and second transmission regions disposed in the bifocal lens of the present invention is shown. In the present embodiment, the first transmissive area 511a located on the outer circumference of the lens 50a is a relatively large fleshy and sharp image for the macro (macro) image, and at the same time, the second inner circumference of the lens 50a. The transmissive area 512a has a relatively small flesh thickness and is clearly imaged by an object image of a normal distance (telephoto). M324797 In another embodiment not shown in the drawings, the optical surface coefficient (for example, curvature) of the second transmission region of the inner ring can be redesigned so that the thickness of the inner and outer rings are similar but have different optical surface coefficients. The different optical plane coefficients of the first and second transmission regions can still produce a bifocal effect, however, such designs typically also vary in thickness due to differences in radius of curvature. Referring to FIG. 12, a fifth embodiment of a lens in which the first and second transmission regions are disposed in the bifocal lens of the present invention is shown. In the present embodiment, the first transmissive area 511b located on the outer circumference of the lens 50b is a clear image with a general optical surface coefficient (curvature) for a normal distance (telephoto), and a second transmission at the inner circumference of the lens. The region 512b is designed by using a Fresnel lens to change the optical surface coefficient (curvature) at a similar thickness for clear imaging of the macro (macro) image and the inner and outer rings. The thickness is similar to reduce the gap. Referring to FIG. 13, a schematic view of a sixth embodiment of the lens 50c provided with the first and second transmission regions in the bifocal lens of the present invention is shown. In the present embodiment, the first transmissive area 5iic located on the outer circumference of the lens 50c is designed using a Fresnel Lens to provide a large magnification for clear imaging of the macro (macro) image. At the same time, the second transmission area 512c of the inner ring of the lens 5ic is a general lens surface design for clear image of the object image of the ordinary distance (distance), and the inner and outer rings of the lens 5ie are similar in thickness to reduce the gap. Referring to FIG. 14, a schematic view of a seventh embodiment of a lens in which the first and second transmission regions are disposed in the bifocal lens of the present invention is shown. In the present embodiment, 'mainly between the lenses 61, 62 and adjacent to the aperture, 13 M324797 is set - the transparent sheet solution _ a (tiling glass). The inner ring of the thin plate material 63 is bare, and the inner ring bare coffee and the outer ring plate optical material substantially cause a thickness difference effect, so that the inner ring bare 632 region (ie, the second transmission) The image light of the region) and the outer ring sheet material 631 region (first-transmissive region) may have different optical path lengths, and also have a double focus effect. The above description is based on the preferred embodiment to explain the present invention in detail, and is not intended to limit the scope of the present invention. Anyone who is familiar with such a skilled person can understand it. If he makes some minor changes and adjustments properly, he will not lose the essence of this creation, and will not deviate from the spirit and scope of this creation. [Simple diagram of the figure] Figure 1 is a schematic diagram of a lens group of a conventional lens with only a fixed focus function. Figure 2 is a graph of the MTF test of a conventional fixed-focus lens as shown in Figure 1. FIG. 3 is a schematic diagram of a preferred embodiment of a bifocal lens of the present invention. Figure 4 is a schematic view of a first embodiment of a lens in which the first and second transmissive regions are disposed in the bifocal lens of the present invention. Figure 5 is a MTF test curve diagram of the present bifocal lens as shown in Figure 4. Figure 6 is a simulation of the optical path of the original bifocal lens shown in Figure 4 at the macro distance. Figure 7 is a simulation of the optical path of the original bifocal lens shown in Figure 4 at normal distance. Figure 8 is a schematic view showing a second embodiment of a lens in which the first and second transmission regions M324797 are disposed in the bifocal lens of the present invention. Figure 9 is a MTF test curve diagram of the present bifocal lens shown in Figure 8. Figure 10 is a schematic view of a third embodiment of a lens in which the first and second transmissive regions are disposed in the bifocal lens of the present invention. Figure 11 is a schematic view showing a fourth embodiment of a lens in which the first and second transmission regions are disposed in the bifocal lens of the present invention. Fig. 12 is a schematic view showing a fifth embodiment of the lens in which the first and second transmission regions are disposed in the bifocal lens of the present invention. Figure 13 is a schematic view showing a sixth embodiment of the lens in which the first and second transmission regions are disposed in the bifocal lens of the present invention. Figure 14 is a schematic view showing a seventh embodiment of the lens in which the first and second transmission regions are disposed in the bifocal lens of the present invention. [Main component symbol description] 10~ conventional lens 11~ first surface
12〜最末表面 20、30、40〜雙焦點鏡顏 21〜鏡片群 21卜411、51〜表面 2111、 31、511、511a、511b、511c〜第一透射區域 2112、 32、512、512a、512b、512c〜第二透射區域 22〜鏡頭座 221、93〜光圈 41、42、50、50a、50b、50c、61、62〜鏡片 52〜定位結構 63〜薄板光學材料 631〜外圈薄板材料 632〜内圈裸空 M324797 91〜物像 911 913〜916〜視場光 92〜 、912〜影像光 成像面12 to the last surface 20, 30, 40 to the bifocal mirror 21 to the lens group 21 411, 51 to the surface 2111, 31, 511, 511a, 511b, 511c to the first transmissive regions 2112, 32, 512, 512a, 512b, 512c to second transmission region 22 to lens holder 221, 93 to aperture 41, 42, 50, 50a, 50b, 50c, 61, 62 to lens 52 to positioning structure 63 to thin plate optical material 631 to outer ring sheet material 632 ~ Inner ring bare space M324797 91 ~ object like 911 913 ~ 916 ~ field of view light 92 ~, 912 ~ image light imaging surface
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