TWI477804B - Imaging optical device - Google Patents
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- TWI477804B TWI477804B TW102123674A TW102123674A TWI477804B TW I477804 B TWI477804 B TW I477804B TW 102123674 A TW102123674 A TW 102123674A TW 102123674 A TW102123674 A TW 102123674A TW I477804 B TWI477804 B TW I477804B
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Description
本發明係有關一種成像光學裝置，特別是關於一種包含二透鏡群的成像光學裝置。The present invention relates to an imaging optical device, and more particularly to an imaging optical device comprising a two lens group.
晶圓級光學技術係使用晶圓層級的半導體技術以製造微型光學裝置，例如透鏡模組或相機模組。晶圓級光學技術可適用於行動或可攜式裝置，而照相已成為這些裝置的必備功能。Wafer-level optical technology uses wafer-level semiconductor technology to fabricate micro-optical devices, such as lens modules or camera modules. Wafer-level optics are available for mobile or portable devices, and photography has become a must-have feature for these devices.
隨著影像感測器(例如電荷耦合元件(CCD)或互補金屬氧化半導體影像感測器(CIS))的尺寸愈來愈小，使得所搭配的成像透鏡亦需縮小尺寸。As image sensors, such as charge coupled devices (CCDs) or complementary metal oxide semiconductor image sensors (CIS), become smaller and smaller, the matching imaging lens also needs to be downsized.
成像透鏡的設計過程極為嚴謹，如此才能符合體積小、重量輕、成本低但解析度高的要求。獨立或結合於可攜式裝置(例如行動電話)的一般用途照相機通常使用二群成像透鏡以達到高解析度的需求。每一群含有二或三個透鏡，其整體地達到所要求的光學特性，且這二群也需互相配合以達到高效能。The design process of the imaging lens is extremely rigorous, so as to meet the requirements of small size, light weight, low cost and high resolution. General purpose cameras, either alone or in combination with portable devices, such as mobile phones, typically use two sets of imaging lenses to achieve high resolution requirements. Each group contains two or three lenses that collectively achieve the desired optical characteristics, and the two groups also need to cooperate to achieve high performance.
為了增加入射光，一般會使用較多群(例如四群)透鏡。然而，由於光的反射或吸收，較多的透鏡群反而會降低入射光，因此，必須使用較大光圈的成像透鏡。但是，較大光圈的成像透鏡會增加製造的困難度及成本。In order to increase the incident light, a larger group (for example, four groups) of lenses is generally used. However, due to the reflection or absorption of light, more lens groups will instead reduce incident light, and therefore, an imaging lens with a larger aperture must be used. However, larger aperture imaging lenses increase manufacturing difficulty and cost.
因此，亟需提供設計者一種新穎的成像光學裝置，特別是晶圓級微型光學裝置，其影像品質高且體積小。Therefore, there is an urgent need to provide designers with a novel imaging optical device, particularly a wafer-level micro-optical device, which has high image quality and small size.
鑑於上述，本發明實施例的目的之一在於提出一種具較高解析度及較多入射光的成像光學裝置。In view of the above, one of the objects of embodiments of the present invention is to provide an imaging optical device having higher resolution and more incident light.
根據本發明實施例，成像光學裝置包含第一透鏡群，其包含實體連接且由物至像依序排列的第一透鏡次群及第二透鏡次群。第一透鏡次群具正屈光力，且第二透鏡次群具負屈光力。成像光學裝置還可包含第二透鏡群，具負屈光力，其中第一透鏡群與第二透鏡群由物到像依序排列。第一透鏡次群至少包含第一透鏡、第二透鏡及第三透鏡，由物到像依序排列；且第二透鏡次群至少包含第四透鏡、第五透鏡及第六透鏡，由物到像依序排列。第三透鏡之向像的鏡面與第四透鏡之向物的鏡面為實體接觸，兩者之間不存在有中間物質且不存在有空氣。According to an embodiment of the invention, the imaging optics comprises a first lens group comprising a first lens subgroup and a second lens subgroup that are physically connected and arranged from object to image. The first lens subgroup has a positive refractive power and the second lens subgroup has a negative refractive power. The imaging optics may further comprise a second lens group having a negative refractive power, wherein the first lens group and the second lens group are sequentially arranged from the object to the image. The first lens subgroup includes at least a first lens, a second lens, and a third lens, which are sequentially arranged from the object to the image; and the second lens subgroup includes at least a fourth lens, a fifth lens, and a sixth lens, As ordered. The mirror surface of the image of the third lens is in physical contact with the mirror surface of the object of the fourth lens, and there is no intermediate substance between them and no air is present.
100‧‧‧成像光學裝置100‧‧‧ imaging optics
1‧‧‧第一透鏡群1‧‧‧First lens group
10‧‧‧光圈層10‧‧‧ aperture layer
1A‧‧‧第一透鏡次群1A‧‧‧First lens subgroup
11‧‧‧第一透鏡11‧‧‧First lens
12‧‧‧第二透鏡12‧‧‧second lens
13‧‧‧第三透鏡13‧‧‧ third lens
1B‧‧‧第二透鏡次群1B‧‧‧second lens subgroup
14‧‧‧第四透鏡14‧‧‧Fourth lens
15‧‧‧第五透鏡15‧‧‧ fifth lens
16‧‧‧第六透鏡16‧‧‧ sixth lens
2‧‧‧第二透鏡群2‧‧‧second lens group
17‧‧‧第七透鏡17‧‧‧ seventh lens
18‧‧‧第八透鏡18‧‧‧ eighth lens
19‧‧‧第九透鏡19‧‧‧ ninth lens
s1~s11‧‧‧鏡面S1~s11‧‧‧Mirror
第一圖顯示本發明實施例的成像光學裝置的透鏡配置。The first figure shows the lens configuration of the imaging optical device of the embodiment of the present invention.
第二A圖及第二B圖顯示第一實施例之成像光學裝置的一些效能。The second A and second B diagrams show some of the performance of the imaging optics of the first embodiment.
第三A圖及第三B圖顯示第二實施例之成像光學裝置的一些效能。The third A and third B diagrams show some of the performance of the imaging optics of the second embodiment.
第一圖顯示本發明實施例的成像光學裝置100的透鏡配置。本實施例之成像光學裝置100可為晶圓層級半導體技術所製造的晶圓級光學透鏡。根據目前技術的水平，晶圓級光學透鏡的尺寸可小於一微米。在其他實施例中，成像光學裝置100可為其他技術所製造的微型光學透鏡。The first figure shows the lens configuration of the imaging optical device 100 of the embodiment of the present invention. The imaging optical device 100 of the present embodiment may be a wafer level optical lens manufactured by wafer level semiconductor technology. According to current state of the art, wafer level optical lenses can be less than one micron in size. In other embodiments, imaging optics 100 can be a miniature optical lens made by other techniques.
如第一圖所示，成像光學裝置100的左側面對物件(簡稱”物”)，而其右側則面對影像(簡稱”像”)或像平面(image plane)。在本實施例中，成像光學裝置100包含二透鏡群，由物到像依序為：第一透鏡群1及第二透鏡群2。第一透鏡群1包含實體連接的二透鏡次群，由物到像依序為：第一透鏡次群1A及第二透鏡次群1B。第一透鏡次群1A作為正透鏡，其具有正屈光力；第二透鏡次群1B作為負透鏡，其具有負屈光力；第二透鏡群2作為負透鏡，其具有負屈光力。As shown in the first figure, the left side of the imaging optical device 100 faces an object (abbreviated as "object"), and the right side thereof faces an image (abbreviated as "image") or an image plane. In the present embodiment, the imaging optical device 100 includes a two lens group, and the object to image is sequentially: the first lens group 1 and the second lens group 2. The first lens group 1 includes a physically connected two lens subgroup, and the object to image sequence is: a first lens subgroup 1A and a second lens subgroup 1B. The first lens subgroup 1A serves as a positive lens having a positive refractive power; the second lens subgroup 1B as a negative lens having a negative refractive power; and the second lens group 2 as a negative lens having a negative refractive power.
在本實施例中，第一透鏡次群1A包含至少三透鏡，由物到像依序為：第一透鏡11、第二透鏡12及第三透鏡13。第二透鏡次群1B包含至少三透鏡，由物到像依序為：第四透鏡14、第五透鏡15及第六透鏡16。第二透鏡群2包含至少三透鏡，由物到像依序為：第七透鏡17、第八透鏡18及第九透鏡19。In this embodiment, the first lens sub-group 1A includes at least three lenses, and the object-to-image sequence is: the first lens 11, the second lens 12, and the third lens 13. The second lens sub-group 1B includes at least three lenses, and the object-to-image order is the fourth lens 14, the fifth lens 15, and the sixth lens 16. The second lens group 2 includes at least three lenses, and the object to image are sequentially: a seventh lens 17, an eighth lens 18, and a ninth lens 19.
第一透鏡11具有向物的非球狀(aspheric)凸鏡面s1。第一透鏡11具有向像的鏡面s2，其貼合於第二透鏡12的向物鏡面s2。本實施例的鏡面s2鍍有一光圈層(STOP)10，其可使用半導體微影蝕刻技術所形成。第二透鏡12具有向像的鏡面s3，其貼合於第三透鏡13的向物鏡面s3。第三透鏡13具有向像的非球狀凸鏡面s4，其貼合於第四透鏡14的向物的非球狀凹鏡面s4。在本實施例中，第三透鏡13向像的非球狀凸鏡面s4與第四透鏡14向物的非球狀凹鏡面s4係實體接 觸，兩者之間不存在有中間物質且不存在有空氣。此可使用壓印(impress)製程來達到，當形成第三透鏡13與第四透鏡14時同時予以壓合，因此不需使用膠以進行結合。第四透鏡14具有向像的鏡面s5，其貼合於第五透鏡15的向物鏡面s5。第五透鏡15具有向像的鏡面s6，其貼合於第六透鏡16的向物鏡面s6。第六透鏡16具有向像的非球狀凸鏡面s7。在本實施例中，鏡面s2、s3、s5及s6可以是，但不限定為，平面。The first lens 11 has an aspherical convex mirror surface s1 of the object. The first lens 11 has a mirror surface s2 that faces the image, and is attached to the objective lens surface s2 of the second lens 12. The mirror surface s2 of this embodiment is plated with a diaphragm layer (STOP) 10 which can be formed using a semiconductor lithography technique. The second lens 12 has a mirror surface s3 that is incident on the objective lens surface s3 of the third lens 13. The third lens 13 has an aspherical convex mirror surface s4 that is attached to the image, and is attached to the non-spherical concave mirror surface s4 of the fourth lens 14. In this embodiment, the third lens 13 is physically connected to the non-spherical convex mirror surface s4 of the image and the fourth lens 14 to the non-spherical concave mirror surface s4 of the object. Touch, there is no intermediate between the two and there is no air. This can be achieved using an imprint process, which is simultaneously pressed when the third lens 13 and the fourth lens 14 are formed, so that no glue is required for bonding. The fourth lens 14 has a mirror surface s5 that is incident on the objective lens surface s5 of the fifth lens 15. The fifth lens 15 has a mirror surface s6 that is incident on the objective lens surface s6 of the sixth lens 16. The sixth lens 16 has an aspherical convex mirror surface s7 of the image. In this embodiment, the mirror surfaces s2, s3, s5, and s6 may be, but are not limited to, planes.
此外，第七透鏡17具有向物的非球狀凸鏡面s8。第七透鏡17具有向像的鏡面s9，其貼合於第八透鏡18的向物鏡面s9。第八透鏡18具有向像的鏡面s10，其貼合於第九透鏡19的向物鏡面s10。第九透鏡19具有向像的非球狀凸鏡面s11。在本實施例中，鏡面s9及s10可以是，但不限定為，平面。Further, the seventh lens 17 has a non-spherical convex mirror surface s8 of the object. The seventh lens 17 has a mirror surface s9 that faces the image, and is attached to the objective mirror surface s9 of the eighth lens 18. The eighth lens 18 has a mirror surface s10 that faces the image, and is attached to the objective lens surface s10 of the ninth lens 19. The ninth lens 19 has an aspherical convex mirror surface s11 that faces the image. In the present embodiment, the mirror surfaces s9 and s10 may be, but are not limited to, planes.
根據本實施例的特徵之一，第三透鏡13的折射率異於(例如小於)第四透鏡14的折射率。在一實施例中，第三透鏡13的折射率介於1.55與1.5之間；且第四透鏡14的折射率介於1.55與1.63之間。According to one of the features of the embodiment, the refractive index of the third lens 13 is different (for example, smaller than) the refractive index of the fourth lens 14. In an embodiment, the refractive index of the third lens 13 is between 1.55 and 1.5; and the refractive index of the fourth lens 14 is between 1.55 and 1.63.
根據本實施例的另一特徵，第三透鏡13的色散係數(dispersion index或稱Abbe值)異於(例如大於)第四透鏡14的色散係數。在一實施例中，第三透鏡13的色散係數介於55與40之間；且第四透鏡14的色散係數介於35與25之間。According to another feature of the embodiment, the dispersion index or Abbe value of the third lens 13 is different from (for example, greater than) the dispersion coefficient of the fourth lens 14. In an embodiment, the third lens 13 has a dispersion coefficient between 55 and 40; and the fourth lens 14 has a dispersion coefficient between 35 and 25.
根據本實施例的又一特徵，第二透鏡12、第五透鏡15及第八透鏡18的折射率介於1.63與1.5之間；且第二透鏡12、第五透鏡15及第八透鏡18的色散係數介於60與40之間。According to still another feature of the embodiment, the refractive indices of the second lens 12, the fifth lens 15, and the eighth lens 18 are between 1.63 and 1.5; and the second lens 12, the fifth lens 15, and the eighth lens 18 are The dispersion coefficient is between 60 and 40.
根據本實施例的再一特徵，第一透鏡次群1A與第二透鏡次群1B的有效焦距之比值介於-0.6與-0.9之間。According to still another feature of the embodiment, the ratio of the effective focal lengths of the first lens subgroup 1A to the second lens subgroup 1B is between -0.6 and -0.9.
在一實施例中，可於第二透鏡12與第五透鏡15(例如玻璃板)的至少一個鏡面鍍有遠紅外光(IR)濾波片。In an embodiment, at least one mirror surface of the second lens 12 and the fifth lens 15 (eg, a glass plate) may be plated with a far infrared (IR) filter.
表1顯示第一實施例的一些鏡面資料，其中，厚度及曲率半徑可以為無單位，或者具單位，例如毫米(mm)。成像光學裝置100的焦距為2.11毫米，F數字(焦比)為2.8，且視域(DFOV)的一半為29.6。Table 1 shows some of the mirror data of the first embodiment, wherein the thickness and radius of curvature may be unitless or have units, such as millimeters (mm). The imaging optical device 100 has a focal length of 2.11 mm, an F number (focal ratio) of 2.8, and a half of the field of view (DFOV) of 29.6.
非球狀鏡面(例如s1、s4、s7、s8或s11)可由以下方程式定義：
其中，對於所有鏡面α 1=0，z為光軸方向上自鏡頭頂點的距離，r為垂直於光軸方向的距離，c為透鏡頂點之曲率半徑的倒數，k為二次曲線常數(conic constant)，α 1至α 9為非球狀係數(aspheric coefficient)。表2例示該方程式的常數及係數。Where, for all mirrors α 1=0, z is the distance from the apex of the lens in the direction of the optical axis, r is the distance perpendicular to the optical axis, c is the reciprocal of the radius of curvature of the apex of the lens, and k is the conic constant (conic Constant), α 1 to α 9 are aspheric coefficients. Table 2 illustrates the constants and coefficients of the equation.
第二A圖及第二B圖顯示第一實施例之成像光學裝置100的一些效能。其中，第二A圖顯示像場曲度(field curvature)，而第二B圖顯示失真度(distortion)。The second A and second B diagrams show some of the performance of the imaging optics 100 of the first embodiment. Among them, the second A picture shows the field curvature, and the second B picture shows the distortion.
表3顯示第二實施例的一些鏡面資料，其中，厚度及曲率半徑可以為無單位，或者具單位，例如毫米(mm)。成像光學裝置100的焦距為2.208毫米，F數字(焦比)為2.8，且視域(DFOV)的一半為28.5。Table 3 shows some of the mirror data of the second embodiment, wherein the thickness and radius of curvature may be unitless or have units, such as millimeters (mm). The imaging optical device 100 has a focal length of 2.208 mm, an F number (focal ratio) of 2.8, and a half of the field of view (DFOV) of 28.5.
表4例示第二實施例之方程式的常數及係數。Table 4 exemplifies the constants and coefficients of the equation of the second embodiment.
第三A圖及第三B圖顯示第二實施例之成像光學裝置100的一些效能。其中，第三A圖顯示像場曲度(field curvature)，而第三B圖顯示失真度(distortion)。The third A and third B views show some of the performance of the imaging optical device 100 of the second embodiment. Among them, the third A picture shows the field curvature, and the third B picture shows the distortion.
根據上述實施例，包含二透鏡群的成像光學裝置100所能獲得的入射光及解析度可相當於傳統具三(或更多)透鏡群的成像光學裝置，因而得以大量降低整體體積並能簡化製程。According to the above embodiment, the incident optical light and the resolution which can be obtained by the imaging optical device 100 including the two lens groups can be equivalent to the conventional imaging optical device having three (or more) lens groups, thereby greatly reducing the overall volume and simplifying Process.
以上所述僅為本發明之較佳實施例而已，並非用以限定本發明之申請專利範圍；凡其它未脫離發明所揭示之精神下所完成之等效改變或修飾，均應包含在下述之申請專利範圍內。The above description is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention; all other equivalent changes or modifications which are not departing from the spirit of the invention should be included in the following Within the scope of the patent application.
100‧‧‧成像光學裝置100‧‧‧ imaging optics
1‧‧‧第一透鏡群1‧‧‧First lens group
10‧‧‧光圈層10‧‧‧ aperture layer
1A‧‧‧第一透鏡次群1A‧‧‧First lens subgroup
11‧‧‧第一透鏡11‧‧‧First lens
12‧‧‧第二透鏡12‧‧‧second lens
13‧‧‧第三透鏡13‧‧‧ third lens
1B‧‧‧第二透鏡次群1B‧‧‧second lens subgroup
14‧‧‧第四透鏡14‧‧‧Fourth lens
15‧‧‧第五透鏡15‧‧‧ fifth lens
16‧‧‧第六透鏡16‧‧‧ sixth lens
2‧‧‧第二透鏡群2‧‧‧second lens group
17‧‧‧第七透鏡17‧‧‧ seventh lens
18‧‧‧第八透鏡18‧‧‧ eighth lens
19‧‧‧第九透鏡19‧‧‧ ninth lens
s1~s11‧‧‧鏡面S1~s11‧‧‧Mirror
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| TW201248238A (en) * | 2011-05-31 | 2012-12-01 | Himax Tech Ltd | Micro-lens module |
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| JP2007286548A (en) * | 2006-04-20 | 2007-11-01 | Sharp Corp | Zoom lens, digital camera, and portable information device |
| US20120170132A1 (en) * | 2010-12-30 | 2012-07-05 | Asia Optical Co., Inc. | Projection prime lens |
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