200825393 ro 22216twf.doc/006 九、發明說明： 【發明所屬之技術領域】 本發明是有關於-種光學檢測方法，且特 一種鏡頭模組的偏芯檢測方法。 W ' 【先前技術】 脉減與手機減的流行，使得辭鏡頭小型 要求極為強烈，除了小型化，市場也同時要求高晝素，因 此大篁的小型化非球面鏡片被使用於光學鏡頭，導致目前 * 流行的小型化鏡頭模組對鏡片的偏芯(d_tration)_極 為敏感。 ' 造成鏡片偏芯問題的主要來源是鏡片本身加工時的芯 取精度、鏡筒内徑的加工精度以及鏡片的組裝過程。鏡^ 的加工精度由於製程與檢測設備的持續精進，基本上是屬 於較可掌控的，而鏡筒加工精度的驗證，則由於尺寸限制， 常會有部分鏡筒内徑的重要尺寸無法測量得到，造成一些 潛在的問題盲點。至於鏡頭組立時的偏芯問題，雖然有檢 φ 測儀器進行鏡片偏芯的量測，但組裝過程的諸多變數，往 往在最終鏡頭模組的品質發生問題時，完全無從判斷造成 問題的原因何在，這已經成為數位影像產業的一個嚴重瓶 頸’實有必要開發一種有效的偏芯檢測方法來解決此問題。 解決鏡頭對各種公差的敏感度問題，通常需從光學設 計時就加以考慮，如美國專利第5,067,067號申請之 Method for evaluating and designing lenses”係將鏡片製作 時應考慮的加工能力及成本問題，加入光學設計時的評價 5 200825393 心 TW 22216twf.doc/006 函數(merit function)内，使得光學優化(optimization)時能將 製作的因素納入。此法是以提高鏡片本身的可製造性為目 的，但卻對於目前業界所遭遇的主要偏芯問題並未考慮到。 另，美國專利第5,627,684號申請之“Method of manufacturing a lens system insensitive to aspheric decentering and a lens system manufactured thereby”，則在 非球面鏡片優化中，暫時性的加入偏芯量，以期得到對偏 心減破的非球面鏡片設計，此法係針對鏡片本身的設計， 而對鏡頭模組的光機問題並無幫助。 針對檢測設備，美國專利第5,999,251號申請之“Lens testing apparatus and a lens adjusting apparatus”，利用量測 成像面的傾斜作為調芯的依據，因為要直接量測成像面的 傾斜，所以量測方法較為複雜，同時量測後並無法判別問 題源自於何處，僅能在組裝過程以調芯方式作補救。 由此可知，到目前為止，仍無有效的檢測鏡頭模組的 偏芯的方法，來判斷偏芯問題的原因何在。 【發明内容】 X月k供種鏡頭板組的偏芯檢測方法，用於判 鏡頭，組，有鏡筒加工及鏡片組裝所造成的偏芯問題， 生偏芯問題之所在。此檢測數據可供鏡片 見同吴/、翏數之修改或組立時偏芯調整及模組匹配之 用’以f鏡麵_最終成像品質。 乎驟本發Γ提出—種鏡賴組的偏芯檢測妓，包括下列 f先’設定-鏡頭模組的參數，並依據鏡頭模組的 200825393 r 31 y i ^+5TW 22216twf.doc/006 參數模擬分析此鏡頭模組的離焦調制傳遞函數曲線，以得 到一模擬分析結果；接著，量測鏡頭模組的離焦調制傳遞 函數曲線，以得到一量測結果；以及比對模擬分析結果鱼 量測結果。 ^ 在本發明之一實施例中，鏡頭模組的參數包括折射 值、鏡片曲面數據、鏡片厚度及間距的設計理想值、公差 值與量測值。200825393 ro 22216twf.doc/006 IX. Description of the Invention: [Technical Field] The present invention relates to an optical detecting method and a eccentric detecting method for a lens module. W '[Previous technology] The popularity of pulse reduction and mobile phone reduction makes the small requirements of the lens extremely strong. In addition to miniaturization, the market also requires high-quality, so large-sized aspherical lenses are used in optical lenses, resulting in At present, the popular miniaturized lens module is extremely sensitive to the eccentricity of the lens (d_tration). The main source of the lens eccentricity problem is the core precision of the lens itself, the processing accuracy of the inner diameter of the lens barrel, and the assembly process of the lens. The processing accuracy of the mirror ^ is basically controllable due to the continuous improvement of the process and the testing equipment. However, due to the size limitation, the important dimensions of the inner diameter of the lens barrel are often not measured. Some blind spots that cause some potential problems. As for the eccentricity problem of the lens assembly, although there is a φ measuring instrument for measuring the eccentricity of the lens, many variables of the assembly process often fail to judge the cause of the problem when the quality of the final lens module occurs. This has become a serious bottleneck in the digital imaging industry. It is necessary to develop an effective eccentricity detection method to solve this problem. Solving the lens's sensitivity to various tolerances is usually considered from the time of optical design. For example, the method for evaluating and designing lenses of the U.S. Patent No. 5,067,067 is incorporated into the processing capability and cost of the lens. Evaluation of optical design 5 200825393 Heart TW 22216twf.doc/006 In the function (merit function), the factors of production can be incorporated in the optical optimization. This method aims to improve the manufacturability of the lens itself, but However, the "Method of manufacturing a lens system insensitive to aspheric decentering and a lens system manufactured"", which is applied to the aspheric lens, is not considered in the current industry. In the medium, the amount of eccentricity is temporarily added in order to obtain the design of the aspherical lens for eccentricity reduction. This method is not designed for the design of the lens itself, but does not help the optomechanical problem of the lens module. Lens testing apparatus and a lens, application No. 5,999,251 Adjusting apparatus", using the tilt of the imaging surface as the basis for the alignment, because the tilt of the imaging surface is directly measured, so the measurement method is complicated, and at the same time, it is impossible to discriminate where the problem originates from the measurement, only In the assembly process, the core is remedy. It can be seen that, so far, there is no effective method for detecting the eccentricity of the lens module to determine the cause of the eccentricity problem. [Summary of the Invention] The eccentricity detection method of the lens board group is used to judge the eccentricity caused by the lens, the group, the lens barrel processing and the lens assembly, and the problem of the eccentricity of the core. The detection data can be used for the lens to see the same Wu/, the number of the lens The modification or assembly of the eccentric core adjustment and module matching use 'f mirror surface _ final imaging quality. 骤 Γ Γ — — 种 种 种 种 种 — — — — — — 镜 妓 妓 妓 妓 妓 妓 妓 妓 妓 妓 妓 妓 妓 妓 妓 妓 妓 妓 妓 妓The parameters of the group are simulated and analyzed according to the 200825393 r 31 yi ^+5TW 22216twf.doc/006 parameter of the lens module to analyze the defocus modulation transfer function curve of the lens module to obtain a simulation analysis result; then, the measurement lens The defocus modulation transfer function curve of the module is used to obtain a measurement result; and the fish measurement result is compared with the simulation analysis result. ^ In an embodiment of the invention, the parameters of the lens module include the refraction value and the lens surface data. Design ideal values, tolerance values and measured values of lens thickness and spacing.
、在本發明之一實施例中，量測鏡頭模組的離焦調制傳 遞函數曲線包括：量職鏡賴姉上以及雜的離焦調 制傳遞函數曲線。 在本發明之一實施例中，比對模擬分析結果與量測結 果包括：比對_糊傳遞函數曲射切線面的調制傳遞 函數曲線無矢_調卿遞聽曲料㈣變化及位置 的偏:ί容。 在本發明之一實施例中，得到量測結果之後，再從多 = 值所㈣的模擬分析結果巾，找A與該量測結 果相付合的一偏芯資料。 門韻知’本發明藉由分析及量職賴組發生偏怒 二組組立後的偏芯誤差，使鏡片 得驗證的依據。 立時偏芯調整及模組匹配可獲 舉之上频徵和伽能更鴨祕，下文特 ’麵合所附圖式，作詳細說明如下。 【實施方式】 1 200825393 rjiyjv^STW 22216tw£doc/006In one embodiment of the present invention, the defocusing modulation transfer function curve of the measurement lens module includes: a measuring lens on the measuring lens and a curve of the defocusing modulation transfer function. In an embodiment of the present invention, the comparison simulation analysis result and the measurement result include: the modulation transfer function curve of the curved tangential plane of the comparison_paste transfer function is not vectorized_the change and the positional deviation of the tuning material (4):容容. In an embodiment of the present invention, after the measurement result is obtained, an eccentricity data of A and the measurement result is obtained from the simulation analysis result towel of the multi-value (4). The door is known as the basis for the verification of the lens by analyzing and measuring the eccentricity error of the two groups after the anger group. The eccentricity adjustment and the module matching can be used to obtain the upper frequency and the gamma energy. The following is a detailed description of the following. [Embodiment] 1 200825393 rjiyjv^STW 22216tw£doc/006
鏡頭模組可廣泛地運用在光學影像產品中，例如是投 影機、相機、攝影機等，而鏡頭模組主要是由鏡筒以及= 個球面或非球面鏡片所組成，尤其是大量使用非球面鏡= 的小型化鏡頭模組，其對鏡片偏芯的問題極為敏感，^即 對偏芯的要求很高。換言之’對於高解析度的鏡頭而言， 少許的偏芯就會造成成像品質顯著地下降。因此，若要判 斷鏡頭模組發生偏芯問題之所在，甚至進一步找出多個鏡 片s中最可能發生此偏芯問題的一鏡片，僅靠組立後的偏 芯檢測結果來研判是不夠的，而是要結合組立前各個 片、鏡筒等7L件的光學設計、模擬及分析的結果。本發明 即是藉由鏡頭模組的光學設計、模擬及分析的結果，^用 鏡頭模組中不同鏡片的偏芯會在不同空間頻率及不同視場 角的條件下呈現不同的像散（astigmatism)特徵 為與偏芯檢測結果驗證的依據。 ’、 請參考圖1，本發明之鏡頭模組的偏芯檢測方法 ^列步驟：步驟sm，設定鏡顯_參數，並依據鏡頭 杈組的麥數模擬分析鏡頭模組的離焦調制傳遞函數 modulation transfer function)曲線，以得到一模擬， 果；接著，步驟sm，量測鏡概_離_制傳遞函^ (MTF)曲線’以得到—量測結果；以及，步驟s⑽比 對模擬分析絲與制縣，以得顺麵崎偏芯資料。 準軸Γ為制的光赠鏡筒的基 旱軸(通吊為鏡同的機械中心轴)之間的橫师_ -種為鏡片的光軸與賴的基準_傾斜⑽），此 8 200825393 ^ 222ΐ_/〇〇6 芯問題皆會造成鏡頭模組在最終成像時，呈現出軸上彗差 (axial coma)及像散(astigmatism)等光學像差(aberrati〇n)。軸 上鋈差會使轴上（on axial)的MTF值較設計值下降，而 像散會使離焦MTF曲線中切線面的（Tangential )Μτρ曲 線與弧矢面的(Sagittal) MTF曲線產生分離。 圖2是沒有偏芯問題的正常鏡頭模組的成像示意圖， ^切線焦面與弧矢焦面在不同的視場角（亦即不同的成像 _ 高度），存在一些輕度的分離現象，此分離現象是由設計結 _ 絲上元件的加工以及組裝過㈣誤差所產生，但只要這 些誤差在允許的公差範圍内，這個待測鏡頭仍是合格的。 圖3顯示鏡頭模組的離焦MTF轉的原始設計值，其中 字母τ代表切線面的MTF曲線，字母s代表弧矢面的mtf 曲線。至於字母丁和S之前的數字代表視場角，圖中僅顯 不了 〇·7視場角（代表23度)的離焦MTF曲線。The lens module can be widely used in optical imaging products, such as projectors, cameras, cameras, etc., and the lens module is mainly composed of a lens barrel and = spherical or aspherical lenses, especially a large number of aspherical mirrors = The miniaturized lens module is extremely sensitive to the problem of the eccentricity of the lens, and the requirement for the eccentric core is very high. In other words, for a high-resolution lens, a slight eccentricity will cause a significant drop in imaging quality. Therefore, if it is necessary to judge the problem of the eccentricity of the lens module, and even find a lens of the plurality of lenses s that is most likely to have this eccentricity problem, it is not enough to judge the eccentricity detection result after the assembly. Rather, it is necessary to combine the optical design, simulation and analysis results of the 7L pieces before the assembly and the lens barrel. The invention is the result of optical design, simulation and analysis of the lens module, and the eccentricity of different lenses in the lens module will exhibit different astigmatism (astigmatism) under different spatial frequencies and different viewing angles. The feature is the basis for verification with the eccentricity test results. Please refer to FIG. 1 , the eccentricity detecting method of the lens module of the present invention, the steps of step sm, setting the mirror _ parameter, and analyzing the defocus modulation transfer function of the lens module according to the worm number of the lens 杈 group. Modulation transfer function) curve to obtain a simulation; fruit; then, step sm, measuring _ _ _ transfer function ^ (MTF) curve 'to obtain - measurement results; and, step s (10) comparison simulation analysis wire With the county, the company has a slanted core information. The quasi-axis is the horizontal axis between the basic axis of the light-giving tube (the mechanical center axis of the mirror is the same) - the kind of the optical axis of the lens and the reference of the lens _ tilt (10), this 8 200825393 ^ 222 ΐ _ / 〇〇 6 core problems will cause the lens module to exhibit axial aberrations (axial coma) and astigmatism (aberrati) when the final imaging. The on-axis coma causes the on-axis MTF to decrease from the design value, while the astigmatism separates the tangent-surface (Tangential) Μτρ curve from the sagittal MTF curve in the defocused MTF curve. 2 is an imaging diagram of a normal lens module without an eccentricity problem. The tangent focal plane and the sagittal focal plane have different angles of view (ie, different imaging _ heights), and there are some slight separation phenomena. The separation phenomenon is caused by the processing of the components on the design and the assembly (4) error, but as long as these errors are within the allowable tolerances, the lens to be tested is still acceptable. Figure 3 shows the original design values of the defocusing MTF rotation of the lens module, where the letter τ represents the MTF curve of the tangent plane and the letter s represents the mtf curve of the sagittal plane. As for the numbers before the letter D and S represent the angle of view, only the defocusing MTF curve of the 视·7 field of view (representing 23 degrees) is shown.
圖4是有偏芯問題的鏡頭模組的成像示意圖，與圖2 相比’切線焦面與弧矢焦面的分離現象變得明顯。當鏡頭模 • 3發5偏芯問題時，由於切線面的MTF較弧矢面的MTFFig. 4 is a schematic view showing the imaging of the lens module having the eccentricity problem, and the separation phenomenon between the tangential focal plane and the sagittal focal plane becomes remarkable as compared with Fig. 2. When the lens module • 3 hairs 5 eccentricity problem, because the MTF of the tangent plane is MTF compared to the sagittal plane
、偏芯問題更為敏感，因此離焦MTF曲線中切線面的MTF 2會比縣_ MTF有較大的偏移量。此現象在使用 ^球面鏡片及高畫素要求的鏡頭中特別地明顯，故可 备作一種有效的鏡頭模組的偏芯檢測方法。 7此藉由離焦MTF曲線中的像散現象，即可研判 、見頭模組中是否有鏡片偏芯的問題。在步驟S110中，本 發月依據鏡頭模組的參數模擬分析曲線，以得到一 200825393 FMy5U!4.TW 22216twf.doc/006 ΐ擬i析結果。鏡頭模組的參數包括折射值、鏡片曲面數 ^固f/度及間距的設計理想值、公差值與量測值^ ,½八、,^面鏡片或球面鏡片經由設計參數的最佳化及可行 2差的5析程序來找出可能的偏芯問題。偏&問題分析 ，序包括刊步n公差設計；評估公差對MTF曲 、、的影響；確認潛在的危險；評估失敗的等級；對於對稱 及非對細誤差影響進行分類；以及描述軸上_差和The eccentricity problem is more sensitive, so the MTF 2 of the tangent plane in the defocused MTF curve will have a larger offset than the county _ MTF. This phenomenon is particularly noticeable in lenses that use spherical lenses and high-definition lenses, so it can be used as an effective eccentricity detection method for lens modules. 7 By the astigmatism phenomenon in the defocusing MTF curve, it is possible to judge whether there is a lens eccentricity in the head module. In step S110, the present month simulates an analysis curve according to the parameters of the lens module to obtain a result of 200825393 FMy5U!4.TW 22216twf.doc/006. The parameters of the lens module include the refraction value, the number of lens surfaces, the design ideal value of the solid f/degree and the pitch, the tolerance value and the measured value ^, 1⁄2, 8, the lens or the spherical lens are optimized through the design parameters. And a feasible 2 difference 5 to find out the possible eccentricity problem. Bias & problem analysis, sequence includes the step n tolerance design; evaluate the impact of tolerance on MTF curve,; identify potential hazards; evaluate the level of failure; classify the effects of symmetrical and non-reciprocal errors; and describe the on-axis _ Poor
2差的特徵。目此，鏡賴_光學料在完成公差分配 4 ’可由偏芯問題分析程序，瞭解鏡片的偏芯問題的 像散現象。 雖然由實際量測出的離焦MTF曲線中的像散現象， 即可研判鏡頭模組中是否有鏡片偏芯的問題。但若要進一 鏡頭极組發生偏芯問題之所在，則需結合光學設計 的模擬分析結果與組立後的量測結果，以將此檢測數據供 鏡片及鏡筒模具參數之修改或組立時偏芯調整及模组匹配 之用。 '' 如步驟S120所示，本發明藉由量測鏡頭模組的離焦 MTF曲線，以得到一量測結果。此量測結果如圖5所示的 有偏芯問題的離焦MTF曲線的量測結果，即量測較具代 表性的軸上以及離轴的MTF曲線，例如量測〇度(代表軸 上）、23度(在本實施例中代表〇·7視場)及3〇度(在本實施例 中代表1·0視場)等不同角度的MTF曲線。在圖5中，僅顯 不在空間頻率33 lp/mm、0.7視場下所得到的MTF值及偏 移量。另可利用自準直儀(aut〇-c〇iiimator)等檢測儀器來量 200825393 FM 145TW 22216twf.doc/〇〇6 測鏡頭模組中各鏡片的單面偏芯，由於鏡頭模組已組裝完 成，量測結果會受到鏡頭模組的基準面及各鏡片的曲率中 心的位置差異而影響。因此，鏡片的偏芯量測結果必須結 合偏芯問題分析程序，比對各個鏡片的偏芯對離焦MTF 曲線的影響，即可研判發生偏芯問題之所在，並確認此偏 芯問題與鏡頭模組的最終成像品質間的對應關係。 如圖6-8所示，藉由從多組參數設定值所得到的不同 杈擬分析結果中，判斷出鏡頭模組的偏芯問題有以下可能 ，況，以找出與量測結果相符合的一偏芯資料。圖6顯示 第1種情況，切線面的離焦MTF曲線在〇·7視場處（圖中 標示0·7 Τ)，峰值高度約為〇·6而位置偏移2〇陣；弧矢面 的離焦MTF曲線在〇·7視場處（圖中標示〇·7 s)，峰值高 度約為G.6而位置無偏移。目7顯示第2種情況，切線面 的離焦MTF曲線在〇·7視場處（圖中標示〇·7 τ)，峰值高 又、、、勺為0·82而位置偏移8〇μιη;弧矢面的離焦mtf曲線在 你7視場處（圖中標不〇·7 s)，峰值高度約為Ο·%而位置 ^ ΙΟμπι。圖8顯示第3種情況，切線面的離售、 (圖中標示0·7τ)，峰值高度約為_而 中伊八t7弧”的離焦瓣曲線在Q.7視場處（圖 不不.）’峰值高度約為〇88而位置偏移阳。 ?接^上所述，與圖5的量測結果相比較，明顯地可知第 視場生偏Ϊ問題之所在。雖然本實施例以〇.7 场仍可作為輯類分析結果與量測結果驗據== 11 200825393 F5IV 145TW 22216twf.doc/006 是，相對於0.7視場而言，〇·8以上的視場在實務上重要性 較低且變數較複雜，而〇·6以下的視場有時特徵不夠明 顯，也較不易單純化來釐清偏芯問題之所在。 如上所述，在步驟S130中，本發明藉由比對模擬分 析結果與量測結果，以得到鏡頭模組的偏芯資料。即，比 對離焦MTF曲線中切線面的ΜΊΤ曲線與弧矢面的mtf 曲線峰值的變化及位置的偏移，來得知偏芯問題之所在。 接著，再從參數設定值當中找出可能影響此偏芯問題的參 數，因此鏡片及鏡筒模具參數之修改或组立時偏芯調整及 模組匹配可獲得驗證的依據。 正 綜上所述，鏡頭模組的精確度與整體組裝的準確度可 經由本發_偏芯檢财法而提升，進崎到鏡頭模組的 理，設計值。因此，本發明能有效解決鏡賴組組立後的 偏芯誤差問題’使嘗额誤的_也相對脑，讓影像光 學的特性達到最佳的表現。 豕尤 —雖然本剌已啸佳實關減如上，财並非用以 限，本發明’任何關技術領域巾具有通常知識者，在不 脫離本發明之精神和範_，當可作些許之更動與潤飾， =本發明之保護範圍當視後附之中請專利範圍所界定者 【圖式簡單說明】 圖1發明之鏡頭模組的偏芯檢測方法的流程圖 圖2是/又有偏芯問題的鏡頭模組的成像示意圖。 12 200825393 r)i 謂⑷ TW 22216twfd〇c/006 圖3顯示鏡頭模組的離焦MTF曲線的原始設計值。 圖4是有偏芯問題的鏡頭模組的成像示意圖。 圖5顯示有偏芯問題的離焦MTF曲線的量測結果。 圖6〜8顯示判斷出鏡頭模組的偏芯問題的三種可能 情況的示意圖。 【主要元件符號說明】 S110〜S130 :各個步驟2 poor characteristics. Therefore, the astigmatism of the lens can be understood by the eccentricity analysis program to understand the astigmatism of the eccentricity problem of the lens. Although the astigmatism in the defocused MTF curve measured by the actual amount can be used to determine whether there is a lens eccentricity in the lens module. However, if you want to enter the lens core group where the eccentricity problem occurs, you need to combine the simulation analysis results of the optical design with the measurement results after the assembly, so that the test data can be modified or assembled when the lens and the lens mold parameters are eccentric. Adjustment and module matching. As shown in step S120, the present invention measures a defocusing MTF curve of the lens module to obtain a measurement result. The measurement result is the measurement result of the defocusing MTF curve with the eccentricity problem shown in FIG. 5, that is, the measurement of the representative on-axis and off-axis MTF curves, such as the measurement of the twist (representing the on-axis) ), an MTF curve of 23 degrees (in the present embodiment, representing a field of view of 7) and 3 degrees (in the present embodiment, representing a field of view of 1·0). In Fig. 5, only the MTF value and the offset amount obtained at the spatial frequency of 33 lp/mm and 0.7 field of view are shown. Alternatively, a self-collimator (aut〇-c〇iiimator) and other measuring instruments can be used to measure the single-sided eccentricity of each lens in the lens module of 200825393 FM 145TW 22216twf.doc/〇〇6, since the lens module has been assembled. The measurement result is affected by the difference between the reference surface of the lens module and the position of the center of curvature of each lens. Therefore, the eccentricity measurement result of the lens must be combined with the eccentricity analysis program. Comparing the influence of the eccentricity of each lens on the defocusing MTF curve, the problem of the eccentricity problem can be judged, and the eccentricity problem and the lens are confirmed. The correspondence between the final imaging quality of the module. As shown in Figure 6-8, by comparing the results of different simulations obtained from multiple sets of parameter settings, it is determined that the eccentricity of the lens module has the following possibilities. A partial core information. Figure 6 shows the first case. The off-focus MTF curve of the tangential plane is at the 〇·7 field of view (0·7 标示 in the figure), the peak height is about 〇·6 and the position is offset by 2 ; ;; The defocusing MTF curve is at the 〇·7 field of view (indicated by 〇·7 s in the figure), the peak height is about G.6 and the position is not offset. Item 7 shows the second case. The defocusing MTF curve of the tangential plane is at the 〇·7 field of view (indicated by 〇·7 τ), the peak height is again, the scoop is 0·82, and the position is shifted by 8〇μιη. The defocused mtf curve of the sagittal plane is in your 7 field of view (the figure is not 〇·7 s), the peak height is about Ο·% and the position ^ ΙΟμπι. Figure 8 shows the third case, the off-sale of the tangent plane, (0·7τ in the figure), the peak height is about _ and the middle-eighth t7 arc” is in the Q.7 field of view (Fig. No.) 'The peak height is about 〇88 and the position is offset by yang. · Compared with the measurement results of Fig. 5, it is obvious that the first field of view is biased. Although this embodiment 〇.7 field can still be used as a series analysis result and measurement result test == 11 200825393 F5IV 145TW 22216twf.doc/006 Yes, compared with 0.7 field of view, 视·8 or more field of view is practically important The performance is lower and the variables are more complicated, and the field of view below 〇·6 is sometimes not obvious enough, and it is not easy to simplify to clarify the problem of the eccentricity. As described above, in step S130, the present invention is performed by comparison simulation. Analyze the results and the measurement results to obtain the eccentricity data of the lens module. That is, the eccentricity of the tangential surface of the tangential surface of the off-focus MTF curve and the change of the peak of the mtf curve of the sagittal plane and the offset of the position are known. The problem lies in. Then, find out from the parameter settings that it may affect the eccentricity problem. Therefore, the modification of the lens and the lens mold parameters or the eccentric adjustment and module matching of the assembly can be verified. In summary, the accuracy of the lens module and the accuracy of the overall assembly can be obtained via the present invention. The eccentricity check method is improved, and the design value is entered into the lens module. Therefore, the present invention can effectively solve the problem of eccentricity error after the group of the mirror group is set up, so that the taste is wrong, and the image is relative to the brain. The optical characteristics achieve the best performance. Chi You--Although Benedict has been reduced to the above, the financial is not limited, the present invention is a general knowledge of any technical field, without departing from the spirit and scope of the present invention. _, when some changes and refinements can be made, = the scope of protection of the present invention is defined in the scope of the patent, which is defined by the scope of the patent [Simplified description of the drawings] Figure 1 Flow chart of the eccentricity detection method of the lens module of the invention Figure 2 is an imaging diagram of a lens module with/with eccentricity problems. 12 200825393 r)i (4) TW 22216twfd〇c/006 Figure 3 shows the original design value of the defocusing MTF curve of the lens module. Lens problem Schematic diagram of the grouping. Figure 5 shows the measurement results of the defocusing MTF curve with the eccentricity problem. Figures 6 to 8 show the three possible situations for judging the eccentricity problem of the lens module. [Main component symbol description] S110 ~S130: each step
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