1322923 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種變焦裝置及方法。 【先前技術】 隨著數位技術之不斷發展，數位相機及帶數位相機之便攜式電子裝置 在人們的生活中愈來愈普及’人們對數位相機之圖像效果、外形體積等要 求也愈來愈高。可變焦數位相機由於可以改變物體成像之焦距，故其可增 大拍攝範圍，提高圖像質量，因而可變焦裝置之應用愈來愈廣泛。 a月參照第二圖’中國大陸專利第01122817.2號揭示一種變焦相機之變 焦裝置，其包括鏡筒71、螺紋圈72、74、導環73、75、内轉動體76、後 鏡頭框架77、前鏡頭框架70、安裝於鏡頭框架上之透鏡組（圖未示）、前 導向框架78及變焦圈79等·»通過螺紋圈72、74、導環73、75及内轉動體 76之間之相互配合’相對移動前鏡頭框架7〇和後鏡頭框架77而改變框架 上之刖透鏡組及後透鏡組間之距離，從而改變入射光從前透鏡組到後透鏡 组之光程，以達到變焦之功能。但，上述通過改變透鏡組間之實際距離而 實現變焦之變焦裝置，因其元件較多，結構複雜，不方便組裝。另，由於 此種變焦係通過實際移動前'後鏡頭框架來實現變焦，在移動過程中，易 出現前後-透鏡組相對偏心現象》 有鑒于此，提供一種結構簡單、組裝方便且可防止出現透鏡組偏心現 象之變焦裝置及方法實爲必要。 【發明内容】 本發明之目的在於提供一種結構簡單、組裝方便且可防止透鏡組偏心 現象之變焦裝置。 本發明之另一目的在於提供一種用於上述變焦裝置上之變焦方法。 本發明之變焦裝置包括：一第一透鏡組、一第二透鏡組、一第一反射 7L件、一第二反射元件，該二反射元件可轉動，該第一反射元件將經第一 透鏡組折射之光反射至該第二反射元件上，該第二反射元件將由第一反射 元件射出之光反射至第二透鏡組上。 1322923 本發明之變焦方法包括以下步驟：提供一第一透鏡組’被攝物體發出 之光入射到該第一透鏡組上；提供一第一反射元件，經上述第一透鏡組折 射後之光入射到該第一反射元件上；提供一第二反射元件，光從上述第_ 反射元件之另一端射出，入射到該第二反射元件上；提供一第二透鏡組， 光從上述第二反射元件之另一端射出，入射到該第二透鏡組上；以及提供 一影像感測元件，經上述第二透鏡組折射後之光入射到該影像感測元件 上；其中’上述第一反射元件及第二反射元件可轉動，以調節反射光之角 度，使經该二反射元件反射之光可入射到第二透鏡組内，轉動該二反射元 件，調節反射光之角度，使經過反射元件之光線之光程發生改變，實現變 焦。 與習知之變焦裝置及方法相比，本發明變焦裝置及方法藉由兩個可轉 動之反射元件，調節反射光之角度，使經過反射元件之光線之光程發生改 變來實現變焦功能，避免改變兩鏡頭間之實際距離，從而使其結構簡單、 組裝方便且不會產生透鏡組偏心現象》 【實施方式】 請參閱第一圖，本發明變焦裝置包括一第一鏡頭1、一第二鏡頭2、一 第一反射元件3、一第二反射元件4、及一影像感測元件5 ^第一反射元件 3及第二艮射元件4位於第一鏡頭1與第二鏡頭2之間，從物方到像方，第 二反射元件4位於第一反射元件3後方，影像感測元件5位於第二鏡頭2 後方。 第一鏡頭1包括第一透鏡組12和鏡筒14,第二鏡頭2包括第二透鏡組 22及鏡筒24，其中第一透鏡組12、第二透鏡組22分別設置於鏡筒丨4、24 内0 第一反射元件3係由基板36表面鍍有反射膜之反射面32、34構成， 該反射面32、34相對且相互平行，光可從一端射入反射元件3，經反射面 32之反射，將光射到反射面34上，再經反射面34之反射，光又射回反射 面32上’經反射面32、34之多次反射，光從該第一反射元件3另—端射 出》轴38穿過基板36，該第一反射元件3可繞轴38轉動》 同樣’第二反射元件4係由基板46表面艘有反射膜之反射面42、44 6 1322923 構成，該反射面42、44相對且相互平行，光可從一端射入該第二反射元件 4，經反射面42之反射，將光射到反射面44上，再經反射面糾之反射， 光又射回反射面42上，經反射面42、44之多次反射，光從該第二反射元 件4另一端射出。轴48穿過基板46 ’該第二反射元件4可繞軸48轉動。1322923 IX. Description of the Invention: [Technical Field of the Invention] The present invention relates to a zoom device and method. [Prior Art] With the continuous development of digital technology, digital cameras and portable electronic devices with digital cameras are becoming more and more popular in people's lives. 'The demand for image effects and shape of digital cameras is getting higher and higher. . Since the zoom digital camera can change the focal length of the object imaging, it can increase the shooting range and improve the image quality, and thus the application of the zoom device becomes wider and wider. A month, a zoom device of a zoom camera including a lens barrel 71, a threaded ring 72, 74, a guide ring 73, 75, an inner rotating body 76, a rear lens frame 77, and a front is disclosed in the second drawing 'China Patent No. 01122817.2. The lens frame 70, the lens group (not shown) mounted on the lens frame, the front guide frame 78, the zoom ring 79, etc. through the threaded rings 72, 74, the guide rings 73, 75 and the inner rotating body 76 The distance between the 刖 lens group and the rear lens group on the frame is changed in conjunction with 'relatively moving the front lens frame 7 〇 and the rear lens frame 77 to change the optical path of the incident light from the front lens group to the rear lens group to achieve the zoom function. . However, the above zooming device that realizes zooming by changing the actual distance between the lens groups has a complicated structure and is inconvenient to assemble because of its many components. In addition, since the zoom system realizes zooming by actually moving the front 'rear lens frame, during the moving process, the front-rear lens group is relatively eccentric. In view of this, a simple structure, convenient assembly, and prevention of the lens are provided. A zooming device and method for group eccentricity are necessary. SUMMARY OF THE INVENTION An object of the present invention is to provide a zoom device which is simple in structure, convenient in assembly, and capable of preventing eccentricity of a lens group. Another object of the present invention is to provide a zoom method for use in the above zoom device. The zoom device of the present invention comprises: a first lens group, a second lens group, a first reflective 7L member, a second reflective member, the two reflective members are rotatable, and the first reflective member will pass through the first lens group The refracted light is reflected onto the second reflective element, which reflects the light emitted by the first reflective element onto the second lens group. 1322923 The zoom method of the present invention comprises the steps of: providing a first lens group 'the light emitted by the object is incident on the first lens group; providing a first reflective element, the light incident after being refracted by the first lens group Providing a second reflective element, the light is emitted from the other end of the first reflective element, incident on the second reflective element; and a second lens group is provided, the light is from the second reflective element The other end is emitted and incident on the second lens group; and an image sensing element is provided, and the light refracted by the second lens group is incident on the image sensing element; wherein the first reflective element and the first The two reflective elements are rotatable to adjust the angle of the reflected light, so that the light reflected by the two reflective elements can be incident into the second lens group, and the two reflective elements are rotated to adjust the angle of the reflected light so that the light passing through the reflective element The optical path changes to achieve zoom. Compared with the conventional zoom device and method, the zoom device and method of the present invention adjusts the angle of the reflected light by two rotatable reflective elements, so that the optical path of the light passing through the reflective element is changed to realize the zoom function, and the change is avoided. The actual distance between the two lenses makes the structure simple, the assembly is convenient, and the eccentricity of the lens group is not generated. [Embodiment] Referring to the first figure, the zoom device of the present invention includes a first lens 1 and a second lens 2 a first reflective element 3, a second reflective element 4, and an image sensing element 5. The first reflective element 3 and the second reflective element 4 are located between the first lens 1 and the second lens 2. To the image side, the second reflective element 4 is located behind the first reflective element 3, and the image sensing element 5 is located behind the second lens 2. The first lens 1 includes a first lens group 12 and a lens barrel 14. The second lens 2 includes a second lens group 22 and a lens barrel 24, wherein the first lens group 12 and the second lens group 22 are respectively disposed on the lens barrel 4, 24 In the first 0, the first reflective element 3 is composed of reflective surfaces 32, 34 on which the surface of the substrate 36 is plated with a reflective film. The reflective surfaces 32, 34 are opposite to each other, and light can be incident from the one end into the reflective element 3, through the reflective surface 32. The reflection, the light is incident on the reflecting surface 34, and then reflected by the reflecting surface 34, and the light is returned to the reflecting surface 32. The plurality of reflections are transmitted through the reflecting surfaces 32, 34, and the light is further from the first reflecting element 3 The end of the shaft 38 passes through the substrate 36, and the first reflective member 3 is rotatable about the axis 38. Similarly, the second reflective member 4 is composed of a reflective surface 42 having a reflective film on the surface of the substrate 46, 44 6 1322923. The faces 42 and 44 are opposite and parallel to each other, and light can be incident from the one end into the second reflecting element 4, and reflected by the reflecting surface 42 to emit light onto the reflecting surface 44, and then reflected by the reflecting surface, and the light is reflected back. On the reflecting surface 42, the reflecting surfaces 42 and 44 are reflected multiple times, and light is emitted from the other end of the second reflecting element 4. The shaft 48 passes through the substrate 46' and the second reflective element 4 is rotatable about the axis 48.
通過轉動第一反射元件3和第二反射元件4,使該第一反射元件3可將 經第一透鏡組12折射之光反射至該第二反射元件4上，該第二反射元件4 可將由該第一反射元件3射出之光反射至第二透鏡組22上。經第二透鏡組 22之折射’被攝物體成像於影像感測元件5上，影像感測元件可以係CCD (Charge Coupled Device,電荷耦合器）影像感測器，也可以係CMOS (Complementary Metal-Oxide Semiconductor,互補金屬氧化物半導體）影像 感測器。 工作時’被攝物體（圖未示）發出之光入射到第一透鏡組12上；經第 一透鏡組12折射後之光入射到第一反射元件3之反射面32上，經反射面 32之反射，將光射到反射面34上，再經反射面34之反射，光又射回反射 面32上’經反射面32、34之多次反射’光從該第一反射元件3另一端射 出；經第一反射元件3之反射，光入射到第二反射元件4之反射面42上， 經反射面42之反射，將光射到反射面44上，再經反射面44之反射，光又 射回反射面42上，經反射面42、44之多次反射，光從該第二反射元件4 另一端射出；經第二反射元件4之反射，光入射到第二透鏡組22上；經第 二透鏡組22折射後之光入射到影像感測元件5上，被攝物體成像於影像感 測元件5上。調焦時，轉動第一反射元件3，調節射向反射面32之光線之 入射角度，使從該第一反射元件3射出之光可射向第二反射元件4，同時轉 動第二反射元件4，調節射向反射面42之光線之入射角度，使從該第二反 射元件4射出之光可射向第二透鏡組22，最終成像於影像感測元件5上。 藉由轉動第一反射元件3及第二反射元件4，使經過該二反射元件之光線之 光程發生改變。轉動第一反射元件3及第二反射元件4可手動實現’也可 由馬達帶動實現。 可以理解，第一反射元件3及第二反射元件4可分別由全反射棱鏡6 (如第二圖所示）代替，全反射稜鏡6係由高折射率材料製成，當射入全 7 1322923 反射稜鏡6之光滿足全反射定律，即由全反射稜鏡6内射向空氣之光之入 射角大於該材料之臨界角，光就被全部反射回玻璃，發生全反射現象，全 反射稜鏡6之一端設有一棋形入光面62，另一端設有一換形出光面64，光 經換形入光面62射入全反射棱鏡6内，經過多次反射’射到換形出光面64 上’此時光之入射角應小於臨界角，光從全反射稜鏡6射出。另外，軸、 48可以不穿過基板36'46 ’而固設於基板36、46上，藉由轉動基板36、 46帶動第一反射元件3及第二反射元件4轉動。第一透鏡組12和第二透鏡 組22還可設置於鏡頭框架上，鏡頭框架可固設於相機機身上。 以 综上所述，本發明符合發明專利要件，爰依法提出專利申請。惟 上所述者僅為本發明之較佳實施例，舉凡熟悉本發明技藝之人^ ,在援依 本發明精神所狀較修飾化，皆應包含糾下之_請專 【圖式簡單說明】 第一圖係本發明變焦裝置之結構示意圖； 第二圖係全反射稜鏡之光路示意圖； 第三圖係習知變焦裝置之剖視圖。 【主要元件符號說明】 1 第一透鏡組 12 2 第二透鏡組 22 14、24 第一反射元件 3 4 反射面 32、34、42、44 36'46 軸 38'48 5 全反射稜鏡 6 62 楔形出光面 64 第一鏡頭 第二鏡頭 鏡筒 第二反射元件 基板 影像感測元件 換形入光面By rotating the first reflective element 3 and the second reflective element 4, the first reflective element 3 can reflect the light refracted by the first lens group 12 onto the second reflective element 4, and the second reflective element 4 can be The light emitted from the first reflective element 3 is reflected onto the second lens group 22. The object reflected by the second lens group 22 is imaged on the image sensing element 5, and the image sensing element can be a CCD (Charge Coupled Device) image sensor or a CMOS (Complementary Metal- Oxide Semiconductor, Complementary Metal Oxide Semiconductor) Image Sensor. When working, the light emitted by the object (not shown) is incident on the first lens group 12; the light refracted by the first lens group 12 is incident on the reflecting surface 32 of the first reflecting element 3, passing through the reflecting surface 32. The reflection, the light is incident on the reflecting surface 34, and then reflected by the reflecting surface 34, and the light is returned to the reflecting surface 32. 'Multiple reflections through the reflecting surfaces 32, 34' from the other end of the first reflecting element 3 After being reflected by the first reflective element 3, the light is incident on the reflective surface 42 of the second reflective element 4, reflected by the reflective surface 42, and the light is incident on the reflective surface 44, and then reflected by the reflective surface 44. The light is incident on the reflective surface 42 and is reflected by the reflective surface 42 and 44. The light is emitted from the other end of the second reflective element 4; the light is incident on the second lens group 22 through the reflection of the second reflective element 4; The light refracted by the second lens group 22 is incident on the image sensing element 5, and the object is imaged on the image sensing element 5. When focusing, the first reflective element 3 is rotated to adjust the incident angle of the light that is directed toward the reflective surface 32, so that the light emitted from the first reflective element 3 can be directed toward the second reflective element 4 while rotating the second reflective element 4. The incident angle of the light incident on the reflecting surface 42 is adjusted so that the light emitted from the second reflecting element 4 can be incident on the second lens group 22 and finally formed on the image sensing element 5. By rotating the first reflective element 3 and the second reflective element 4, the optical path of the light passing through the two reflective elements is changed. Rotating the first reflective element 3 and the second reflective element 4 can be accomplished manually or by a motor. It can be understood that the first reflective element 3 and the second reflective element 4 can be replaced by a total reflection prism 6 (as shown in the second figure), respectively, and the total reflection 稜鏡6 is made of a high refractive index material when the injection is all 7 1322923 The light of the reflection 稜鏡6 satisfies the law of total reflection, that is, the incident angle of the light emitted from the total reflection 稜鏡6 into the air is greater than the critical angle of the material, and the light is totally reflected back to the glass, and the total reflection phenomenon occurs. One end of the mirror 6 is provided with a chess-shaped light-incident surface 62, and the other end is provided with a curved-shaped light-emitting surface 64. The light is incident on the total-reflecting prism 6 through the shaped light-incident surface 62, and is subjected to multiple reflections to the curved surface. 64 On the time, the incident angle of the light should be less than the critical angle, and the light is emitted from the total reflection 稜鏡6. In addition, the shafts 48 can be fixed to the substrates 36, 46 without passing through the substrate 36'46', and the first reflective element 3 and the second reflective element 4 can be rotated by rotating the substrates 36, 46. The first lens group 12 and the second lens group 22 may also be disposed on the lens frame, and the lens frame may be fixed to the camera body. In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and those who are familiar with the art of the present invention should be modified in accordance with the spirit of the present invention. The first figure is a schematic view of the structure of the zoom device of the present invention; the second figure is a schematic view of the light path of the total reflection ;; the third figure is a cross-sectional view of the conventional zoom device. [Main component symbol description] 1 First lens group 12 2 Second lens group 22 14, 24 First reflective element 3 4 Reflecting surfaces 32, 34, 42, 44 36'46 Axis 38'48 5 Total reflection 稜鏡 6 62 Wedge-shaped light-emitting surface 64 first lens second lens barrel second reflective element substrate image sensing element changed into light surface