1317044 « 九、.發明說明： •【發明所屬之技術領域】 本發明係涉及一種兩段式對焦鏡頭結構，尤係涉 及一種適用於照相系統之兩段式對焦鏡頭結構。 【先前技術】 隨著科學技術和現代工業之不斷發展，便攜式數 碼相機、照相手機等照相産品已得到廣泛之應用，故 | 該等産品中的照相系統的對焦鏡頭結構之品質亦越 來越受到業者的關注。 目前照相系統之對焦鏡頭結構，相當一部分係採 用兩段式光學對焦技術，習知兩段式對焦鏡頭結構 中，鏡頭組之軸向定位一般係由彈簧來實現，即利用 彈簧之彈力實現鏡頭組之伸縮移動以達到對焦之目 的，但由於彈簧具有受外力就易發生彈性形變之性 質，其外界影響較大，故彈簧很難控制鏡頭之行程， 使鏡頭組不能精確對位，降低了對焦鏡頭結構之精確 度，進而影響成像之品質，故需加以改進。 【發明内容】 有鑒於此，實有必要提供一種可提高對焦精確度 之兩段式對焦鏡頭結構。 一種兩段式對焦鏡頭結構，包括鏡頭組及套設於 該鏡頭組上之上、下線圈座，該鏡頭組上設有永久磁 石，該上、下線圈座分設於永久磁石之兩側，該上、 6 1317044 4 下線圈座之繞線部上分別纏繞有線圈，每一線圈座從 繞線部向外延伸形成底板，所述永久磁石收容在由該 上線圈座之底板與下線圈座之底板間形成的容置空 間内，且該線圈通電激磁後與永久磁石産生交互作用 •而驅動鏡頭組運動時，所述永久磁石在上述容置空間 . 内移動。 ‘一種兩段式對焦鏡頭結構，包括外殼、設於外殼 内之第一、第二線圈座及設於第一、第二線圈座内之 B 鏡頭組，該鏡頭組之外圍中間套設有永久磁石，該第 一、第二線圈座上纏繞有線圈且分設於永久磁石之兩 侧，該第一、第二線圈座於靠近永久磁石之一侧分別 設有底板，每一底板設有向另一線圈座彎折延伸之至 少一突塊，所述突塊上設有導引線圈之線頭的引線端 子，所述線圈通電激磁後與永久磁石產生交互作用而 驅動鏡頭組於該第一線圈座之底板與第二線圈座之 | 底板間做切換。 與習知技術相比，上述兩段式對焦鏡頭結構中， 由於線圈座上設有底板，故磁石只能在上、下線圈座 之底板間移動，以完成鏡頭在遠焦點與近焦點之間的 相互切換，可提高鏡頭組伸縮移動之精確性，從而提 高對焦鏡頭結構成像之品質。 【實施方式】 圖1至圖5所示爲本發明兩段式對焦鏡頭結構10 一較佳實施例之示意圖，該兩段式對焦鏡頭結構10可 7 1317044 * · . .應用於具有照相系統之便攜式電子裝置如數瑪相 機、照相手機内，其·在一退焦點B (如圖4所示）及 一近焦點A (如圖5所示）之間做切換，該兩段式對焦 鏡頭結構10包括一外殻11 (如圖2所示）、置於外殼工工 • 内之一鏡頭組12、套設於鏡頭組U兩端之上、下線圈 • 座14、15及用於承載上、下線圈座14、15之一底座17。 該鏡頭組12包括一圓環形之鏡筒121及置於鏡筒 • 121内之一鏡頭122，該鏡筒121之外圍中間套設有一 鲁 永久磁石124，該鏡筒121之底端形成兩向外凸伸並軸 向延伸之凸條127，所述兩凸條127對稱設置（圖中僅 其中一凸條可見），以將鏡筒121固定在下線圈座15 内。該鏡筒121之内緣上設有内螺紋126，該永久磁石 124之内徑與該鏡筒121之外徑相當。該鏡頭122大致 呈圓柱狀，其容置於該鏡筒121内，該鏡頭122之外表 面上設有與鏡筒121上之内螺紋126相响合的外螺紋 • 136 ’以使該鏡頭122與該鏡筒121形成緊密配合。 該上、下線圈座14、15分設於該永久磁石124之 兩側，其由可被磁化之材料製成如矽鋼等，以加強 上、下線圈座14、15上之線圈145、155 (如圖3所示） 通電時産生之磁場，該上、下線圈座14、15上均設有 —層很薄的絕緣層161。每一線圈座14、15包括一筒 狀之繞線部141、151及分別從繞線部141、151兩端向 外沿伸形成之頂板142、152與底板143、153，據此， 該繞線部141、151可分別供線圈145、155纏繞於其 8 1317044 ，上，該下線圈座15之繞線部151内形成與鏡筒121上之 凸條127相匹配之凹槽154，藉由凹槽154和凸塊127之 卡合來實現鏡頭組12在圓周方向之定位，該繞線部 141、151之内徑稍大於鏡筒ui之外徑，以使鏡筒121 容置於其中並可沿線圈座14、15之軸線相對移動。該 底板143、153大致呈方形，其四角各設有一切角、 156，每一切角146、156向永久磁石124彎折延伸形成 一突塊147、157 ’其中下線圈座15上之切角156較上 B 線圈座14上之切角146大，下線圈座15上之突塊157等 於上線圈座14之底板143與下線圈座15之底板153間 的間距’以使突塊157剛好卡合於突塊147内，且抵住 上線圈座14上之底板143 ’如圖3所示，可防止線圈座 14、15沿其徑向移動，從而減少線圈座14、15之晃動， 並確保組裝後鏡頭組12移動行程之準確性，在其他實 施例中，切角146亦可較切角156大，且將突塊147剛 | 好卡合於突塊157内，使突塊147之高度等於上線圈座 14之底板143與下線圈座15之底板153間的距離並抵 住下線圈座15之底板153，從而將線圈座14、15定位。 每一線圈座14、15從切角146、156之位置向外水 平設有兩引線端子148、158 ’以便於導引線圈145、 155兩端之線頭與供電之電源連接，本實施例中，該 兩導線端子148、158分別形成在相鄰之兩切角146、 156上。該頂板142、152亦大致呈方形，該上線圈座 14之頂板142可作爲對焦鏡頭結構10之上蓋，以防止 9 1317044 灰塵進入對焦鏡頭結構10内。該下線圈座15之頂板 152設於該底座17上並與該底座17相結合，該底座17 與上述引線端子148、158對應之兩角落上向外凸設兩 接線端子159，所述接線端子159由導電材料製成如 鐵、銅等，或其上塗有一層導電材料，接線端子159 與設於底座17下方之電路板（圖未示）連通，該線圈 145、155之線頭經由引線端子148、158纏繞整理後焊 接於接線端子159上以與電路板電連接，藉由線圈 145、155通電激磁産生變化之磁場，以改變線圈座 14、15兩端之磁極性，通電過程中該上、下線圈座14、 15上產生極性相反之磁場。 該外殼11套設於該上、下線圈座14、15外圍，該 外殼11由呈U型之兩侧壁111、112組成，該側壁111與 側壁112可藉由相配合之卡合結構113連接固定。 組裝時，該鏡頭122藉由與該鏡筒121内之内螺紋 126相嚙合的外螺紋136，旋轉置於該鏡筒121内，以 使該鏡頭122與該鏡筒121緊密螺合組合成鏡頭組 12 ;該上、下線圈座14、15分別由永久磁石124之兩 側套設於鏡筒121之兩端，該上、下線圈座14、15上 之突塊147、157相互疊壓，突塊157伸入至突塊147内 並抵住上線圈座14之底板143，且於上線圈座14之底 板143與下線圈座15之底板153間形成收容該永久磁 石124之一容置空間160 (如圖3所示）；線圈145、155 以一定方向纏繞於該上、下線圈座14、15之繞線部 1317044 141、151上，每一線圈145、155之兩線頭經由引線端 • 子148、158整理後分別焊接於底座17上之接線端子 159上，這樣可簡化組裝程式’實現結構模組化；該 外殼11套設於線圈座14、15之外圍。 - 請參照圖4與圖5，工作時，該兩段式對焦鏡頭結 . 構10之鏡頭組12在近焦點A和遠焦點B之間做切換。假 設該永久磁石12之上爲N極，下爲S極’該鏡頭組12起 始定位於遠焦點B處，如圖4所示，此時下線圈座15之 ® 底板153與永久磁石124之底端相接觸，上線圈座14之 底板143與永久磁石124之頂端相距一定的距離。由於 線圈145、155之繞線設置使兩線圈145、155産生之磁 場方向相反，故當線圈145、155通電激磁後，可使上 線圈座14之磁場方向爲上爲N極、下爲S極，下線圈座 15之磁場方向爲上爲8極、下爲N極，於鄰近永久磁石 124—端之磁場磁性均爲5極，上線圈座14與永久磁石 _ 124異性相吸，下線圈座15與永久磁石124同性相斥， 一起推動鏡頭組12向上運動至定位於近焦點a位置， 如圖5所示，此時上線圈座14之底板143與永久磁石 124之頂端相接觸’下線圈座15之底板153與永久磁石 124之底端相距一定的距離。 由於鏡頭組12定位於近焦點a後，線圈141、151 斷電消磁，線圈座14、15上之磁場消失，由於上線圈 座14爲可被磁化之材料製成’永久磁石被上線圈 座14所剩下之殘磁吸引’使鏡頭組12不需要再提供電 11 1317044 .力仍然定位於近焦點A位置。 . 同理’當輪入至線圈145、155之電流方向變換 時’該兩段式對焦鏡頭結構10之鏡頭組12即可由近焦 點A向遠焦點B之間切換。 上述兩段式對焦鏡頭結構1〇中，由於上、下線圈 座14、15上分別設有底板143、153，故永久磁石124 在上、下線圈座14、15之底板143、153間移動，以完 成鏡頭122在近焦點a與遠焦點B之間的相互切換，可 > 提高鏡頭組12伸縮移動之精確性。同時底板143、153 上設有突塊147、157，可防止線圈座14、15沿其徑向 移動，從而減少線圈座14、15之晃動，進而提高對焦 鏡頭結構10成像之品質。另外，突塊147、157上設有 引線端子148、158，線圈141、151可經由引線端子 148、158與供電之電源連通，可簡化對焦鏡頭結構10 之組裝程式，實現結構模組化。 _ 综上所述，本發明符合發明專利之要件，爰依法 k出專利申§青。惟以上所述者僅為本發明之較佳實施 例，舉凡熟悉本案技藝之人士，在爰依本發明精神所 作之等效修飾或變化，皆應涵蓋於以下之申請專利範 圍内。 【圖式簡單說明】 圖1爲本發明兩段式對焦鏡頭結構一較佳實施例 之立體分解圖。 圖2爲圖1所示兩段式對焦鏡頭結構之立體組裝 12 1317044 圖。 圖3爲圖1所示兩段式對焦鏡頭結構去掉外殼後 之示意圖。 圖4爲圖1所示兩段式對焦鏡頭結構沿IV-IV線之 剖面圖。 圖5爲圖4所示兩段式對焦鏡頭結構另一工作狀 態之示意圖。 【主要元件符號說明】1317044 « IX. INSTRUCTIONS: • Technical Field to Which the Invention A Field The present invention relates to a two-stage focusing lens structure, and more particularly to a two-stage focusing lens structure suitable for use in a camera system. [Prior Art] With the continuous development of science and technology and modern industry, photographic products such as portable digital cameras and camera phones have been widely used. Therefore, the quality of the focusing lens structure of the camera system in these products is also increasingly affected. The concern of the industry. At present, the focusing lens structure of the camera system adopts a two-stage optical focusing technology. In the conventional two-stage focusing lens structure, the axial positioning of the lens group is generally realized by a spring, that is, the lens group is realized by the elastic force of the spring. The telescopic movement achieves the purpose of focusing, but since the spring is susceptible to elastic deformation due to external force, the external influence is large, so it is difficult for the spring to control the stroke of the lens, so that the lens group cannot be accurately aligned, and the focus lens is lowered. The accuracy of the structure, which in turn affects the quality of the image, needs to be improved. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a two-stage focusing lens structure that can improve focusing accuracy. A two-stage focusing lens structure includes a lens group and a top and a lower coil holder disposed on the lens group, wherein the lens group is provided with a permanent magnet, and the upper and lower coil holders are respectively disposed on two sides of the permanent magnet. Coils are wound on the winding portions of the upper, 6 1317044 4 lower coil bases, and each coil base extends outward from the winding portion to form a bottom plate, and the permanent magnet is received in the bottom plate and the lower coil base of the upper coil base. The accommodating space formed between the bottom plates and the coil is energized to interact with the permanent magnets. When the lens group is driven to move, the permanent magnets move within the accommodating space. a two-stage focusing lens structure comprising a casing, first and second coil bases disposed in the casing, and a B lens group disposed in the first and second coil bases, wherein the outer periphery of the lens set is permanently provided a magnet, the first and second coil bases are wound with coils and are respectively disposed on two sides of the permanent magnet, and the first and second coil bases are respectively provided with a bottom plate on one side of the permanent magnet, and each bottom plate is provided with a The other coil holder is bent to extend at least one protrusion, and the protrusion is provided with a lead terminal for guiding the wire end of the coil, and the coil is energized to interact with the permanent magnet to drive the lens group at the first Switch between the bottom plate of the coil base and the bottom plate of the second coil base. Compared with the prior art, in the above two-stage focusing lens structure, since the bottom plate is provided on the coil base, the magnet can only move between the bottom plates of the upper and lower coil bases to complete the lens between the far focus and the near focus. The mutual switching can improve the accuracy of the telescopic movement of the lens group, thereby improving the quality of the imaging structure of the focus lens. 1 to 5 are schematic views showing a preferred embodiment of a two-stage focusing lens structure 10 according to the present invention. The two-stage focusing lens structure 10 can be applied to a camera system. In a portable electronic device such as a gamma camera or a camera phone, switching between a retreat focus B (shown in FIG. 4) and a near focus A (as shown in FIG. 5), the two-stage focus lens structure 10 The utility model comprises a casing 11 (shown in FIG. 2), a lens assembly 12 disposed in the outer casing, a sleeve on the two ends of the lens group U, a lower coil socket 14, 15 and a carrier. A base 17 of one of the lower coil holders 14, 15. The lens assembly 12 includes a circular lens barrel 121 and a lens 122 disposed in the lens barrel 121. The outer circumference of the lens barrel 121 is provided with a permanent magnet 124. The bottom end of the lens barrel 121 forms two The ribs 127 projecting outward and extending axially are symmetrically disposed (only one of the ribs is visible in the drawing) to fix the lens barrel 121 in the lower coil holder 15. The inner circumference of the lens barrel 121 is provided with an internal thread 126, and the inner diameter of the permanent magnet 124 is equivalent to the outer diameter of the lens barrel 121. The lens 122 is substantially cylindrical and is received in the lens barrel 121. The outer surface of the lens 122 is provided with an external thread 136' corresponding to the internal thread 126 on the lens barrel 121 to make the lens 122. A close fit is formed with the barrel 121. The upper and lower coil holders 14, 15 are respectively disposed on both sides of the permanent magnet 124, and are made of a material that can be magnetized, such as a steel or the like, to reinforce the coils 145, 155 on the upper and lower coil holders 14, 15. As shown in FIG. 3, the magnetic field generated at the time of energization is provided with a thin layer of insulating layer 161 on the upper and lower coil holders 14, 15. Each of the coil holders 14, 15 includes a tubular winding portion 141, 151 and a top plate 142, 152 and a bottom plate 143, 153 which are respectively formed outwardly from both ends of the winding portions 141, 151, whereby the winding The wire portions 141, 151 are respectively wound around the coils 145, 155, and the groove portion 154 of the lower coil base 15 is formed with a groove 154 matching the rib 127 on the lens barrel 121. The engagement of the groove 154 and the protrusion 127 realizes the positioning of the lens group 12 in the circumferential direction, and the inner diameter of the winding portion 141, 151 is slightly larger than the outer diameter of the lens barrel ui so that the lens barrel 121 is accommodated therein. It is relatively movable along the axis of the coil formers 14, 15. The bottom plates 143, 153 are substantially square, and each of the four corners is provided with a corner 156. Each of the corners 146, 156 is bent and extended toward the permanent magnet 124 to form a protrusion 147, 157 'the corner 156 of the lower coil base 15 The chamfer 146 on the lower bobbin holder 14 is larger than the chamfer 146 on the lower bobbin holder 15, and the projection 157 on the lower bobbin holder 15 is equal to the distance between the bottom plate 143 of the upper bobbin holder 14 and the bottom plate 153 of the lower bobbin holder 15 so that the projection 157 is just engaged. The bottom plate 143' in the projection 147 and against the upper coil holder 14 prevents the coil holders 14, 15 from moving in the radial direction as shown in Fig. 3, thereby reducing the sway of the coil holders 14, 15 and ensuring assembly. The accuracy of the movement of the rear lens group 12 is. In other embodiments, the chamfer 146 may be larger than the chamfer 156, and the protrusion 147 is just engaged with the protrusion 157 so that the height of the protrusion 147 is equal to The distance between the bottom plate 143 of the upper coil base 14 and the bottom plate 153 of the lower coil base 15 abuts against the bottom plate 153 of the lower coil base 15, thereby positioning the coil formers 14, 15. Each of the coil holders 14, 15 is horizontally disposed with two lead terminals 148, 158' from the positions of the chamfers 146, 156 so that the ends of the lead coils 145, 155 are connected to the power supply of the power supply, in this embodiment. The two wire terminals 148, 158 are formed on adjacent two corners 146, 156, respectively. The top plates 142, 152 are also substantially square, and the top plate 142 of the upper coil base 14 can serve as a cover for the focus lens structure 10 to prevent 9 1317044 dust from entering the focus lens structure 10. The top plate 152 of the lower coil base 15 is disposed on the base 17 and combined with the base 17. The base 17 and the lead terminals 148, 158 have two terminals 159 protruding outwardly from the corresponding corners of the lead terminals 148, 158. 159 is made of a conductive material such as iron, copper or the like, or is coated with a conductive material thereon, and the terminal 159 is connected to a circuit board (not shown) provided under the base 17, and the wire ends of the coils 145 and 155 are via lead terminals. 148, 158 is wound and soldered to the terminal 159 for electrical connection with the circuit board, and the coils 145, 155 are energized to generate a changing magnetic field to change the magnetic polarity of the coil holders 14, 15 at the end of the energization process. A magnetic field of opposite polarity is generated on the lower coil holders 14, 15. The outer casing 11 is sleeved on the outer periphery of the upper and lower coil bases 14, 15. The outer casing 11 is composed of two U-shaped side walls 111, 112. The side wall 111 and the side wall 112 can be connected by a matching engaging structure 113. fixed. When assembled, the lens 122 is rotated and placed in the lens barrel 121 by an external thread 136 that meshes with the internal thread 126 of the lens barrel 121, so that the lens 122 and the lens barrel 121 are tightly screwed together to form a lens. The upper and lower coil holders 14 and 15 are respectively sleeved on both ends of the lens barrel 121 by the two sides of the permanent magnet 124, and the protrusions 147 and 157 on the upper and lower coil holders 14 and 15 are superposed on each other. The protrusion 157 extends into the protrusion 147 and abuts against the bottom plate 143 of the upper coil base 14, and forms a receiving space for receiving the permanent magnet 124 between the bottom plate 143 of the upper coil base 14 and the bottom plate 153 of the lower coil base 15. 160 (shown in FIG. 3); the coils 145, 155 are wound in a certain direction on the winding portions 1337044 141, 151 of the upper and lower coil holders 14, 15, and the two ends of each of the coils 145, 155 are connected via the lead ends. • The sub-148s and 158s are respectively soldered to the terminals 159 on the base 17, which simplifies the assembly process and realizes modularization of the structure; the casing 11 is sleeved on the periphery of the coil holders 14, 15. - Referring to FIG. 4 and FIG. 5, in operation, the two-stage focus lens assembly 10 is switched between the near focus A and the far focus B. Assume that the permanent magnet 12 is N pole and the bottom is S pole 'the lens group 12 is initially positioned at the far focus B, as shown in FIG. 4, at this time, the lower base 153 of the lower coil base 15 and the permanent magnet 124 The bottom ends are in contact with each other, and the bottom plate 143 of the upper coil base 14 is at a certain distance from the top end of the permanent magnet 124. Since the windings of the coils 145 and 155 are arranged such that the magnetic fields generated by the two coils 145 and 155 are opposite in direction, when the coils 145 and 155 are energized, the magnetic field of the upper coil holder 14 can be made up to be N pole and bottom S pole. The magnetic field direction of the lower coil base 15 is 8 poles on the upper side and N poles on the lower side. The magnetic field of the magnetic field adjacent to the permanent magnet 124 is 5 poles. The upper coil base 14 and the permanent magnet _ 124 are oppositely attracted, and the lower coil base 15 is repelled with the permanent magnet 124, and pushes the lens group 12 upward to position at the near focus a position. As shown in FIG. 5, the bottom plate 143 of the upper coil base 14 is in contact with the top end of the permanent magnet 124. The bottom plate 153 of the seat 15 is at a certain distance from the bottom end of the permanent magnet 124. Since the lens group 12 is positioned at the near focus a, the coils 141, 151 are deenergized, and the magnetic field on the coil holders 14, 15 disappears. Since the upper coil holder 14 is made of a material that can be magnetized, the permanent magnet is placed on the coil holder 14 The remaining residual magnetic attraction 'has no need for the lens group 12 to supply electricity 11 1317044. The force is still positioned at the near focus A position. Similarly, when the current direction of the coils 145, 155 is changed, the lens group 12 of the two-stage focus lens structure 10 can be switched from the near focus point A to the far focus point B. In the two-stage focusing lens structure 1A, since the upper and lower coil holders 14, 15 are respectively provided with the bottom plates 143, 153, the permanent magnet 124 moves between the bottom plates 143, 153 of the upper and lower coil holders 14, 15 In order to complete the mutual switching between the near focus a and the far focus B of the lens 122, the accuracy of the telescopic movement of the lens group 12 can be improved. At the same time, the bottom plates 143, 153 are provided with protrusions 147, 157, which prevent the coil holders 14, 15 from moving in the radial direction thereof, thereby reducing the shaking of the coil holders 14, 15 and thereby improving the quality of the imaging of the focus lens structure 10. Further, the bumps 147, 157 are provided with lead terminals 148, 158, and the coils 141, 151 can be connected to the power supply via the lead terminals 148, 158, which simplifies the assembly procedure of the focus lens structure 10 and realizes modularization. _ In summary, the present invention complies with the requirements of the invention patent, and the patent application § 青. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art of the present invention should be included in the following claims. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an exploded perspective view showing a preferred embodiment of a two-stage focusing lens structure of the present invention. FIG. 2 is a perspective view of the three-dimensional assembly 12 1317044 of the two-stage focusing lens structure shown in FIG. 1. Fig. 3 is a schematic view showing the structure of the two-stage focusing lens shown in Fig. 1 with the outer casing removed. Figure 4 is a cross-sectional view of the two-stage focus lens structure of Figure 1 taken along line IV-IV. Fig. 5 is a view showing another working state of the structure of the two-stage focusing lens shown in Fig. 4. [Main component symbol description]
兩段式對焦鏡頭結構 10 外殼 11 側壁 111 、 112 卡合結構 113 鏡頭組 12 鏡筒 121 鏡頭 122 永久磁石 124 内螺紋 126 凸條 127 外螺紋 136 上線圈座 14 繞線部 141、 151 頂板 142 ' 152 底板 143、153 線圈 145 、 155 切角 146、156 突塊 147 、 157 引線端子 148、158 接線端子 159 下線圈座 15 凹槽 154 容置空間 160 絕緣層 161 底座 17 近焦點 A 达_焦點 B 13Two-stage focusing lens structure 10 Housing 11 Side wall 111, 112 Engagement structure 113 Lens group 12 Lens barrel 121 Lens 122 Permanent magnet 124 Internal thread 126 Bar 127 External thread 136 Upper coil holder 14 Winding portion 141, 151 Top plate 142 ' 152 bottom plate 143, 153 coil 145, 155 chamfer 146, 156 tab 147, 157 lead terminal 148, 158 terminal 159 lower coil base 15 groove 154 accommodating space 160 insulation layer 161 base 17 near focus A reaches _ focus B 13