TWI804330B - Eight-piece imaging lens - Google Patents
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Abstract
Description
本發明是關於一種光學鏡頭,特別是關於一種八片式取像鏡頭。The invention relates to an optical lens, in particular to an eight-piece imaging lens.
光學鏡頭普遍為人們所使用,其中車用鏡頭亦為常用領域。其中,如何實現大視角並兼顧成像品質,實是值得本領域人士思量的。Optical lenses are widely used by people, and automotive lenses are also commonly used. Among them, how to achieve a large viewing angle while taking into account the imaging quality is really worthy of consideration by people in the field.
本發明之主要目的在於提供一種可實現大視角並兼顧成像品質的八片式取像鏡頭。The main purpose of the present invention is to provide an eight-piece imaging lens capable of achieving a large viewing angle and taking into account the imaging quality.
為了達成上述及其他目的,本發明提供一種八片式取像鏡頭,由物側至像側依序包括第一鏡片、第二鏡片、第三鏡片、第四鏡片、第五鏡片、光圈、第六鏡片、第七鏡片及第八鏡片。第一、第二、第三鏡片均具有負屈光力。第四鏡片具有正屈光力,其物側面及其像側面均為凸面。第五鏡片具有正屈光力,其物側面為凹面且其像側面為凸面。第六鏡片具有正屈光力,其物側面及其像側面均為凸面。第七鏡片具有負屈光力,其物側面為凹面且其像側面為凸面。第八鏡片具有負屈光力,其物側面為凹面且其像側面為凸面。藉此,前鏡群由屈光力分別為負、負、負、正、正的五片鏡片組成,後鏡群則由屈光力分別為正、負、負的三片鏡片組成,前、後鏡群間以光圈隔開,如此屈光力配置有助於減少像差,實現大視角並兼顧成像品質。In order to achieve the above and other objects, the present invention provides an eight-piece image-taking lens, which includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, an aperture, and a first lens from the object side to the image side. The sixth lens, the seventh lens and the eighth lens. The first, second and third lenses all have negative refractive power. The fourth lens has positive refractive power, and its object side and image side are both convex. The fifth lens has positive refractive power, its object side is concave and its image side is convex. The sixth lens has positive refractive power, and its object side and image side are both convex. The seventh lens has negative refractive power, its object side is concave and its image side is convex. The eighth lens has negative refractive power, its object side is concave and its image side is convex. In this way, the front lens group is composed of five lenses with negative, negative, negative, positive, and positive refractive powers, and the rear lens group is composed of three lenses with positive, negative, and negative refractive powers. Separated by apertures, this configuration of refractive power helps to reduce aberrations, achieve a large viewing angle and take into account the imaging quality.
如前述的八片式取像鏡頭中,還可滿足下列關係式: 40<F1×F2<50;其中F1為該第一鏡片的焦距值,F2為該第二鏡片的焦距值;藉此,有助於增加系統最大視角。As in the aforementioned eight-piece imaging lens, the following relationship can also be satisfied: 40<F1×F2<50; where F1 is the focal length value of the first lens, and F2 is the focal length value of the second lens; thereby, Helps increase the maximum viewing angle of the system.
如前述的八片式取像鏡頭中,還可滿足下列關係式:1.61<R5/R6<2;其中R5為該第三鏡片物側面的曲率半徑,R6為該第三鏡片像側面的曲率半徑;藉此,可透過控制第三鏡片的面型來修正系統畸變。As in the aforementioned eight-piece imaging lens, the following relationship can also be satisfied: 1.61<R5/R6<2; where R5 is the radius of curvature of the object side of the third lens, and R6 is the radius of curvature of the image side of the third lens ; Thereby, the system distortion can be corrected by controlling the surface shape of the third lens.
如前述的八片式取像鏡頭中,還可滿足下列關係式: 6<(V6/V7)×F6<7;其中V6為該第六鏡片的色散係數,V7為該第七鏡片的色散係數,F6為該第六鏡片的焦距值;藉此,可透過第六、第七鏡片材質的搭配,將有助於修正系統色差。 As in the aforementioned eight-piece imaging lens, the following relationship can also be satisfied: 6<(V6/V7)×F6<7; where V6 is the dispersion coefficient of the sixth lens, V7 is the dispersion coefficient of the seventh lens, and F6 is the focal length value of the sixth lens; , The matching of the seventh lens material will help to correct the system chromatic aberration.
如前述的八片式取像鏡頭中,還可滿足下列關係式: -1.5<(R15×R16)/F8<0;其中R15為該第八鏡片物側面的曲率半徑,R16為該第八鏡片像側面的曲率半徑,F8為該第八鏡片的焦距值;藉此,可透過控制第八鏡片的面型與焦距值來修正系統場曲。 As in the aforementioned eight-piece imaging lens, the following relationship can also be satisfied: -1.5<(R15×R16)/F8<0; where R15 is the radius of curvature of the object side of the eighth lens, R16 is the radius of curvature of the image side of the eighth lens, and F8 is the focal length of the eighth lens; thereby , the field curvature of the system can be corrected by controlling the surface shape and focal length of the eighth lens.
如前述的八片式取像鏡頭中,還可滿足下列關係式: -1.5<(R7+R8+R9+R10)/(F4+F5)<0;其中R7為該第四鏡片物側面的曲率半徑,R8為該第四鏡片像側面的曲率半徑,R9為該第五鏡片物側面的曲率半徑,R10為該第五鏡片像側面的曲率半徑,F4為該第四鏡片的焦距值,F5為該第五鏡片的焦距值;藉此,可透過控制第四、第五鏡片的面型與焦距值搭配來修正系統像散。 As in the aforementioned eight-piece imaging lens, the following relationship can also be satisfied: -1.5<(R7+R8+R9+R10)/(F4+F5)<0; where R7 is the radius of curvature of the object side of the fourth lens, R8 is the radius of curvature of the image side of the fourth lens, and R9 is the radius of curvature of the fourth lens The radius of curvature of the object side of the fifth lens, R10 is the radius of curvature of the image side of the fifth lens, F4 is the focal length value of the fourth lens, and F5 is the focal length value of the fifth lens; The surface shape and focal length of the five lenses are matched to correct system astigmatism.
如前述的八片式取像鏡頭中,還可滿足下列關係式:200<FOV<220;其中FOV為該八片式取像鏡頭的最大視角,從而加強光學鏡頭的廣視角特色。As in the aforementioned eight-piece imaging lens, the following relationship can also be satisfied: 200<FOV<220; wherein FOV is the maximum viewing angle of the eight-piece imaging lens, thereby enhancing the wide viewing angle characteristic of the optical lens.
如前述的八片式取像鏡頭中,還可滿足下列關係式: 0.7<(R3-R4)/(R3+R4)<1;其中R3為該第二鏡片物側面的曲率半徑,R4為該第二鏡片像側面的曲率半徑;藉此,可透過控制第二鏡片的面型來修正像散。 As in the aforementioned eight-piece imaging lens, the following relationship can also be satisfied: 0.7<(R3-R4)/(R3+R4)<1; where R3 is the radius of curvature of the object side of the second lens, and R4 is the radius of curvature of the image side of the second lens; thereby, the second lens can be controlled surface to correct for astigmatism.
請參考第1圖,所繪示者為本發明的第一實施例,八片式取像鏡頭在光軸L上由物側A至像側B依序包括第一鏡片10、第二鏡片20、第三鏡片30、第四鏡片40、第五鏡片50、光圈ST、第六鏡片60、第七鏡片70及第八鏡片80,於像側B處設有CCD、CMOS或其他感光元件(未繪示),於感光元件與第八鏡片80之間可設有濾光片或保護玻璃等平板鏡片90,平板鏡片90的數量可依需求增減或不設置。Please refer to FIG. 1, which shows the first embodiment of the present invention. The eight-piece imaging lens includes a
首先需聲明的是,於本文中,當一曲面的曲面圓心較該曲面本身更靠近像側時,則該曲面之曲率半徑為正值;反之,當一曲面的曲面圓心較該曲面本身更靠近物側時,則該曲面之曲率半徑為負值。而除非另為說明,否則所述「物側面」及「像側面」的凹、凸面型及曲率半徑均係指該表面在光軸L處的面型及曲率半徑。First of all, it should be stated that in this article, when the center of a curved surface is closer to the image side than the surface itself, the radius of curvature of the surface is a positive value; otherwise, when the center of a curved surface is closer to the surface itself On the object side, the radius of curvature of the surface is negative. And unless otherwise stated, the concave, convex and curvature radii of the "object side" and "image side" all refer to the surface shape and curvature radius of the surface at the optical axis L.
於本發明的第一實施例中,第一鏡片10具有負屈光力,其物側面為凸面且像側面為凹面,其物側面為凸面的設計有助於增加系統最大視角。In the first embodiment of the present invention, the
第二鏡片20具有負屈光力,其物側面為凸面且其像側面為凹面,本實施例中,第二鏡片20與第一鏡片10的搭配有助於修正畸變。The
第三鏡片30具有負屈光力,其物側面為凸面且其像側面為凹面,從而有助於修正像差。The
第四鏡片40具有正屈光力,其物側面及像側面均為凸面。The
第五鏡片50具有正屈光力,其物側面為凹面且其像側面為凸面,本實施例中,第五鏡片50與第四鏡片40的搭配有助於修正像散。The
第六鏡片60具有正屈光力,其物側面及像側面均為凸面。The
第七鏡片70具有負屈光力,其物側面為凹面且其像側面為凸面,並且,第六、第七鏡片60、70為膠合鏡片,兩者的搭配有助於修正色差。The
第八鏡片80具有負屈光力,其物側面為凹面且其像側面為凸面,其物側面為凹面的設計有助於修正場曲。The
本實施例中,第一至第八鏡片的物側面及像側面均為球面,且第一至第八鏡片均為玻璃鏡片。並且,以光圈為界,第一至第五鏡片形成前鏡群,第六至第八鏡片形成後鏡群,其中前鏡群中各鏡片的屈光力配置依序為負、負、負、正、正,後鏡群中各鏡片的屈光力配置依序為正、負、負,如此組合有助於減少像差,實現大視角並兼顧成像品質。In this embodiment, the object side and the image side of the first to eighth lenses are all spherical, and the first to eighth lenses are all glass lenses. And, with the aperture as the boundary, the first to fifth lenses form the front lens group, and the sixth to eighth lenses form the rear lens group, wherein the refractive power configuration of each lens in the front lens group is negative, negative, negative, positive, Positive, the refractive power configuration of each lens in the rear lens group is positive, negative, and negative in sequence. This combination helps to reduce aberrations, achieve a large viewing angle and take into account the imaging quality.
本實施例的八片式取像鏡頭的設計參數如下表一所示,需先說明的是,物側面對應的距離值代表該鏡片在光軸L上的厚度,像側面對應的距離值代表該鏡片與次一鏡片或次一光圈ST在光軸L上的間距:The design parameters of the eight-piece imaging lens of this embodiment are shown in Table 1 below. It should be noted that the distance value corresponding to the object side represents the thickness of the lens on the optical axis L, and the distance value corresponding to the image side represents the thickness of the lens. The distance between the lens and the next lens or the next aperture ST on the optical axis L:
表一
依據表一可得下列表二之關係式數值:According to Table 1, the following relational values in Table 2 can be obtained:
表二
如此一來,透過鏡片之間的搭配組合,本實施例的八片式取像鏡頭能夠表現良好的成像品質。其場曲及畸變圖可見於第2、3圖,顯見本實施例具有良好的成像效果。In this way, through the collocation and combination of lenses, the eight-piece imaging lens of this embodiment can exhibit good imaging quality. The field curvature and distortion diagrams can be seen in Figs. 2 and 3. It is obvious that this embodiment has a good imaging effect.
請參考第4圖,所繪示者為本創作的第二實施例,其鏡片配置與第一實施例大致雷同,本實施例的八片式成像鏡頭的設計參數如下表三所示:Please refer to Figure 4, which shows the second embodiment of this invention, and its lens configuration is roughly the same as that of the first embodiment. The design parameters of the eight-piece imaging lens of this embodiment are shown in Table 3 below:
表三
依據表三可得下列表四之關係式數值:According to Table 3, the following relational values in Table 4 can be obtained:
表四
如此一來,透過鏡片之間的搭配組合,本實施例的八片式取像鏡頭能夠表現良好的成像品質。其場曲及畸變圖可見於第5、6圖,顯見本實施例具有良好的成像效果。In this way, through the collocation and combination of lenses, the eight-piece imaging lens of this embodiment can exhibit good imaging quality. The field curvature and distortion diagrams can be seen in Figs. 5 and 6, which shows that this embodiment has a good imaging effect.
請參考第7圖,所繪示者為本創作的第三實施例,其鏡片配置與第一實施例大致雷同。本實施例的八片式成像鏡頭的設計參數如下表五所示:Please refer to Fig. 7, which is the third embodiment of the invention, and its lens configuration is roughly the same as that of the first embodiment. The design parameters of the eight-chip imaging lens of this embodiment are shown in Table 5 below:
表五
依據表五可得下列表六之關係式數值:According to Table 5, the relational values in the following Table 6 can be obtained:
表六
如此一來,透過鏡片之間的搭配組合,本實施例的八片式取像鏡頭能夠表現良好的成像品質。其場曲及畸變圖可見於第8、9圖,顯見本實施例具有良好的成像效果。In this way, through the collocation and combination of lenses, the eight-piece imaging lens of this embodiment can exhibit good imaging quality. The field curvature and distortion diagrams can be seen in Figs. 8 and 9, which shows that this embodiment has a good imaging effect.
請參考第10圖,所繪示者為本創作的第四實施例,其鏡片配置與第一實施例大致雷同。本實施例的八片式成像鏡頭的設計參數如下表七所示:Please refer to Fig. 10, which is the fourth embodiment of the invention, and its lens configuration is roughly the same as that of the first embodiment. The design parameters of the eight-chip imaging lens of this embodiment are shown in Table 7 below:
表七
依據表七可得下列表八之關係式數值:According to Table 7, the value of the relational expression in the following Table 8 can be obtained:
表八
如此一來,透過鏡片之間的搭配組合,本實施例的八片式取像鏡頭能夠表現良好的成像品質。其場曲及畸變圖可見於第11、12圖,顯見本實施例具有良好的成像效果。 In this way, through the collocation and combination of lenses, the eight-piece imaging lens of this embodiment can exhibit good imaging quality. The field curvature and distortion diagrams can be seen in Figs. 11 and 12, which shows that this embodiment has a good imaging effect.
10:第一鏡片 20:第二鏡片 30:第三鏡片 40:第四鏡片 50:第五鏡片 60:第六鏡片 70:第七鏡片 80:第八鏡片 90:平板鏡片 A:物側 B:像側 ST:光圈 L:光軸 10: First lens 20: second lens 30: Third lens 40: Fourth lens 50: fifth lens 60: sixth lens 70: seventh lens 80: eighth lens 90: flat lens A: Object side B: image side ST: Aperture L: optical axis
第1圖為本發明第一實施例的示意圖。Fig. 1 is a schematic diagram of the first embodiment of the present invention.
第2圖為本發明第一實施例的場曲圖。Fig. 2 is a field curvature diagram of the first embodiment of the present invention.
第3圖為本發明第一實施例的畸變圖。Fig. 3 is a distortion map of the first embodiment of the present invention.
第4圖為本發明第二實施例的示意圖。Fig. 4 is a schematic diagram of the second embodiment of the present invention.
第5圖為本發明第二實施例的場曲圖。Fig. 5 is a field curvature diagram of the second embodiment of the present invention.
第6圖為本發明第二實施例的畸變圖。Fig. 6 is a distortion diagram of the second embodiment of the present invention.
第7圖為本發明第三實施例的示意圖。Fig. 7 is a schematic diagram of the third embodiment of the present invention.
第8圖為本發明第三實施例的場曲圖。Fig. 8 is a field curvature diagram of the third embodiment of the present invention.
第9圖為本發明第三實施例的畸變圖。Fig. 9 is a distortion diagram of the third embodiment of the present invention.
第10圖為本發明第四實施例的示意圖。Fig. 10 is a schematic diagram of the fourth embodiment of the present invention.
第11圖為本發明第四實施例的場曲圖。Fig. 11 is a field curvature diagram of the fourth embodiment of the present invention.
第12圖為本發明第四實施例的畸變圖。Fig. 12 is a distortion map of the fourth embodiment of the present invention.
10:第一鏡片 10: First lens
20:第二鏡片 20: second lens
30:第三鏡片 30: Third lens
40:第四鏡片 40: Fourth lens
50:第五鏡片 50: fifth lens
60:第六鏡片 60: sixth lens
70:第七鏡片 70: seventh lens
80:第八鏡片 80: eighth lens
90:平板鏡片 90: flat lens
A:物側 A: Object side
B:像側 B: image side
ST:光圈 ST: Aperture
L:光軸 L: optical axis
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US20210080693A1 (en) * | 2018-06-05 | 2021-03-18 | Fujifilm Corporation | Imaging lens and imaging apparatus |
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