201243412 六、發明說明： 【發明所屬之技術領域】 本發明是有關於一種光學鏡頭裝置，特別是指一種對 焦機構。 【先前技術】 以往的一種對焦機構，例如中華民國第131〇848號發明 專利可防止洩光的鏡頭」，'是將減速齒輪設置於對焦螺桿 與步進馬達間，步進馬達透過減速齒輪來驅動對焦螺桿， 進而使對焦群框相對基座滑移，但此類型的對焦機構合 因減速齒輪組間的背隙（backlash)而影響對焦精度，此外 還會產生噪音。 參閱圖1與圖2 ’而以往的另—種對焦機構玉，是利用 2 t U直接驅動對焦螺桿12及螺帽13，進而使對焦 目對基座15滑移’但由於步進馬達11的軸心會前 後竄動，將會直接影響到對焦的精度，此外，步θ 同樣有作動噪音大的缺失。 在，置檢知方面，以往的檢測單元16僅能檢測對焦群 王12疋否到達檢測點’而無法檢測對焦群框〖 =端(一遠拍端(一)等各種不同位置，= 進m… 慰13 '月移時’各位置是採用步 :…的步數來控制，推測該對焦群框12的位置 :2=ΓΓ涉產生失步時，將無法準確控制對焦群框 的位置’進而影響對焦精度。 因此’―種W提高㈣、精度且降低噪音的對焦機構 201243412 ，為目前相關業者的研發目標之… 【發明内容】 因此，本發日月> β 目的，即在提供一種可以提高對焦精 度且降低噪音的對焦機構。 & & 1疋本發明對焦機構包♦—基座、—對焦群框、一 致動單元，及—於、、丨s _ «利单7〇。該對焦群框可滑移地設置於該 土座上，該致動單元包括—設置於該基座的線圈，及-設 ^於該對焦群框的致動磁石，該檢測單元包括-設置於該 土座的霍爾元件’及_設置於該對焦群框的檢測磁石。 本發明之功效在於，利用該線圈來驅動該致動磁石相 ^ 進而帶動S亥對焦群框相對該基座滑移，達到無嗓 D的力效再利用霍爾元件來感知該檢測磁石的位置 ，達到提高對焦精度的功效。 【實施方式】 有關本發明之前述及其他技術内容、特點與功效，在 、下配β參考圖式之一個較佳實施例的詳細說明中，將可 清楚的呈現。 在本發明被詳細描述之前，要注意的是，在以下的說 明内容中，類似的元件是以相同的編號來表示。 參閱圖3與圖4，本發明對焦機構之第一較佳實施例包 3基座2、一對焦群框3、一致動單元4，及一檢測單元 5 〇 該基座2包括一導槽21及一導引軸22。 該對焦群框3可滑移地設置於該基座2上，該對焦群 201243412 框3包括對應該導槽21的一導引凸塊31，及對應套設於該 導引轴22的導引套管32。 該致動單元4包括一設置於該基座2的線圈41，及一 設置於該對焦群框3的致動磁石42。 該檢測單元5包括一設置於該基座2的霍爾元件51 , 及一設置於該對焦群框3的檢測磁石52。 在本第一較佳實施例中，該制動磁石42與檢測磁石52 呈-體式’而該對焦群框3還包括供該制動磁石42與檢測 磁石52固定的—導磁金屬板％，該致動單元4與該檢測單 元5彼此共用該磁石42、52,有助於降低用料成本並簡化 製造流程。 麥阅圆 圖6，在驅動該對焦群框3相對該^ 座2滑，進打對焦動作時，是透過該致動單元*的線圈^ 產生預定磁場強度，以致動該致動磁石42相對趨近或遠凑 料圈4卜進而帶動該對焦群框3相對該基座2滑移至？ 疋位置’在進彳m時，該對焦群框3抑 在該基座2¾描° % 引軸22上M S 切移，與利㈣料㈣32在該I 引轴 ^移’維持對焦時的準直度。 在驅動完成後，利用該檢測單元霍 知該檢測磁石52的 ㈣51’相 霍爾元件51的相對距離、又仔知該檢測磁石52與索 LI 't - ΛΑ ，進而可以檢測該對焦群框3是：g 到達預疋的對焦位置，古 端（配合參閱圖5)、違;;對焦群框3在例如《 的檢測精確度。 ^ (配合參閱圖6)等不同位！ 201243412 值得一提的是，該致動磁石42與該檢測磁石52也可 分別设置，不限於呈一體式，同樣可以達到本第一較佳實 施例的功效。 综上所述，本第一較佳實施例的優點在於： 一、 利用該致動單元4的線圈磁場強度，以無接觸（ conucdess)方式致動該致動磁石42’替代以往的步進馬達 、減速齒輪等驅動機構，確實改善致動該對焦群框3時的 噪音問題，達到無噪音驅動的功效。 、 二、 透過該檢測單元5的霍爾元件51與檢測磁石52， 來檢測該對焦群框3的位置，提高對該對焦群框3在不同 位置的檢測精確度，有效避免因機構干涉而產生失步的缺 失0 、 三、使用線圈41與致動磁；5 42取代步進馬達，達到 降低成本的功效。 惟以上所述者，僅為本發明之較佳實施例而已，當不 能以此限定本發明實施之範圍，即大凡依本發明中請:利 範圍及發明說明内容所作之簡單的等效變化與修飾，皆仍 屬本發明專利涵蓋之範圍内。 【圖式簡單說明】 圖 圖 圖 實施例 1疋立體圖’說明以往的一種對焦機構； 2是立體圖’說明以往對焦機構的一檢測單元； 3是立體分解圖，說明本發明對焦機構的第一較佳201243412 VI. Description of the Invention: [Technical Field] The present invention relates to an optical lens device, and more particularly to a focusing mechanism. [Prior Art] A conventional focusing mechanism, such as the invention patent of the Republic of China No. 131〇848, which prevents leakage of light, "sets the reduction gear between the focusing screw and the stepping motor, and the stepping motor transmits the reduction gear. The focus screw is driven to move the focus group frame relative to the base. However, this type of focus mechanism affects the focus accuracy due to the backlash between the reduction gear sets, and noise is generated. Referring to FIG. 1 and FIG. 2', the conventional focusing mechanism jade directly drives the focusing screw 12 and the nut 13 by using 2 t U, thereby causing the focusing target to slide toward the base 15 but due to the stepping motor 11 The axis will move forward and backward, which will directly affect the accuracy of focusing. In addition, step θ also has a lack of active noise. In terms of detection, the conventional detection unit 16 can only detect whether the focus group king 12 到达 does not reach the detection point 'can not detect the focus group frame 〖 = end (a far shot end (a) and other various positions, = enter m ... comfort 13 'when moving in the month', each position is controlled by the number of steps: ..., the position of the focus group frame 12 is estimated: 2 = the position of the focus group frame cannot be accurately controlled when the shift occurs. It affects the focusing accuracy. Therefore, the focusing mechanism 201243412, which is a kind of W (4), precision and noise reduction, is the research and development target of the relevant industry. [Invention content] Therefore, the purpose of the present day and the month is to provide a kind of A focusing mechanism that improves focusing accuracy and reduces noise. && 1 The focusing mechanism of the present invention includes a base, a focusing group frame, an actuating unit, and -, 丨s _ «利单7〇. The focusing group frame is slidably disposed on the soil seat, the actuation unit includes: a coil disposed on the base, and an actuation magnet disposed on the focusing group frame, the detecting unit including - disposed on the The Hall element's Hall element 'and _ are set in the pair The function of the invention is that the coil is used to drive the actuating magnet phase, thereby driving the S-Hay focusing group frame to slide relative to the base, thereby achieving the forcelessness of the D-free Hall element. Perceiving the position of the detecting magnet to improve the focusing accuracy. [Embodiment] The foregoing and other technical contents, features and effects of the present invention are described in detail in a detailed description of a preferred embodiment of the β reference pattern. Before the present invention is described in detail, it is to be noted that in the following description, similar elements are denoted by the same reference numerals. Referring to FIG. 3 and FIG. 4, the focusing mechanism of the present invention The first preferred embodiment includes a base 2, a focus group frame 3, an actuating unit 4, and a detecting unit 5. The base 2 includes a guiding slot 21 and a guiding shaft 22. The focusing group frame 3 The frame group 3 includes a guiding protrusion 31 corresponding to the guiding groove 21 and a guiding sleeve 32 correspondingly sleeved on the guiding shaft 22. The frame group 3 of the focusing group 201243412 is slidably disposed. The actuation unit 4 includes a base disposed on the base a coil 41 of 2, and an actuating magnet 42 disposed on the focus group frame 3. The detecting unit 5 includes a Hall element 51 disposed on the base 2, and a detecting magnet disposed on the focusing group frame 3. 52. In the first preferred embodiment, the brake magnet 42 and the detecting magnet 52 are in a body type, and the focusing group frame 3 further includes a magnetic conductive metal plate % for fixing the braking magnet 42 and the detecting magnet 52. The actuating unit 4 and the detecting unit 5 share the magnets 42 and 52 with each other, which helps to reduce the cost of materials and simplifies the manufacturing process. As shown in Fig. 6, the focusing group frame 3 is driven to slide relative to the seat 2, When the focusing operation is performed, the predetermined magnetic field strength is generated through the coil of the actuating unit* to actuate the actuating magnet 42 to approach or close the material ring 4 to drive the focusing group frame 3 relative to the base 2 Sliding to?疋 position 'when entering m, the focus group frame 3 is on the base 226 ° % axis 22 on the MS cut, and the (four) material (four) 32 in the I axis shift 'maintaining focus when collimating degree. After the driving is completed, the detecting unit is used to detect the relative distance of the (four) 51' phase Hall element 51 of the detecting magnet 52, and the detecting magnet 52 and the cable LI 't - ΛΑ are known, and the focusing group frame 3 can be detected. Yes: g reaches the pre-existing focus position, the ancient end (with reference to Figure 5), violates;; the focus group box 3 is in the detection accuracy, for example. ^ (with reference to Figure 6) and other different bits! 201243412 It is worth mentioning that the actuating magnet 42 and the detecting magnet 52 can also be separately arranged, and are not limited to being integrated, and the effect of the first preferred embodiment can be achieved. In summary, the first preferred embodiment has the following advantages: 1. Using the coil magnetic field strength of the actuating unit 4, the actuating magnet 42' is actuated in a non-contact manner to replace the conventional stepping motor. The driving mechanism such as the reduction gear does improve the noise problem when the focus group frame 3 is actuated, and achieves the effect of noiseless driving. 2. The Hall element 51 and the detecting magnet 52 of the detecting unit 5 detect the position of the focusing group frame 3, and improve the detection accuracy of the focusing group frame 3 at different positions, thereby effectively avoiding interference caused by mechanism interference. The loss of out of step 0, three, the use of coil 41 and actuating magnetic; 5 42 instead of stepper motor, to achieve cost reduction. However, the above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent change between the scope of the invention and the description of the invention is Modifications are still within the scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a conventional focusing mechanism; 2 is a perspective view illustrating a detecting unit of a conventional focusing mechanism; and 3 is an exploded perspective view showing the first comparison of the focusing mechanism of the present invention. good
4是立體圖，說明本第一 較佳實施例的一基座及— 201243412 對焦群框的組配關係； 圖5是頂視圖，說明本第一較佳實施例在近拍端位置 ;及 圖6是頂視圖，說明本第一較佳實施例在遠拍端位置 201243412 【主要元件符號說明】 2…… ·····基座 4…… .....致動單元 21 ••…導槽 41…. ……線圈 22...·. •…導引軸 42 .·…致動磁石 3…… •…對焦群框 5…… .....檢測單元 31 ·.··. •…導引凸塊 51 .···. …··霍爾元件 32 •…導引套管 52··... 33.···. ···.導磁金屬板4 is a perspective view illustrating a pedestal of the first preferred embodiment and a combination of the 201243412 focus group frame; FIG. 5 is a top view illustrating the position of the first preferred embodiment at the close-up end; and FIG. It is a top view, illustrating the first preferred embodiment at the telephoto end position 201243412 [Main component symbol description] 2... ·····Base 4............. Actuating unit 21 ••... Slot 41..........coil 22...·.•...guide shaft 42.·...actuating magnet 3...•...focus group frame 5.............detection unit 31 ·.··. ...guide bump 51 ........ Hall element 32 •... guide sleeve 52··... 33.···.···. magnetic metal plate