Imaging-used optical system, image capturing device and electronic device
An optical system and imaging technology, applied in the fields of optics, optical components, instruments, etc., can solve the problems of difficult to have both large aperture and short total length, unable to meet the needs of imaging quality, too high and so on.
Active Publication Date: 2017-04-05
LARGAN PRECISION
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AI-Extracted Technical Summary
Problems solved by technology
However, the known optical system is difficult to be mounted on thin and light electronic devices because it is difficult to meet the requirements of large aperture and short overall length.
[0004] Although the six-chip...
Method used
In the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens of the imaging optical system described in the preceding paragraph, there is an air gap between any two adjacent lenses; That is, the optical system for imaging has six single unbonded lenses. Since the manufacturing process of cemented lenses is more complicated than that of non-cemented lenses, especially the bonding surface of the two lenses must have a high-precision curved surface in order to achieve high adhesion when the two lenses are bonded, and during the bonding process, it may also be caused by misalignment Poor fit affects the overall optical imaging quality. Therefore, in the optical system for imaging of the present invention, there is an air gap between any two adjacent lenses, which can effectively solve the problems caused by cemented lenses.
The 6th lens has negative refraction power, and its object side surface near optical axis place can be concave surface, and its image side surface near optical axis place is concave surface, and comprises at least one convex surface like side surface off-axis place, can make imaging use The principal point of the optical system (Principal Point) is far away from the imaging surface, which is beneficial to shorten the back focal length to maintain miniaturization, and can effectively correct the aberration of the off-axis field of view.
The near optical axis place of the 4th lens object side surface can be a convex surface, and the near optical axis place of image side surface is a concave surface, so as to strengthen the astigmatism correction, and can slow down the variation of the 4th lens overall surface shape, effectively reduce the influence of stray light Produced to achieve both good imaging quality and manufacturability. ...
Abstract
The invention discloses an imaging-used optical system, an image capturing device and an electronic device. The imaging-used optical system sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens sequentially from an object side to an image side, wherein the first lens has positive refractive power, and the surface, close to the optical axis, of the object side is a convex surface; the surface, close to the optical axis, of the image side of the third lens is a concave surface; the surface, close to the optical axis, of the image side of the fourth lens is a concave surface; the fifth lens has positive refractive power; and the sixth lens has negative refractive power, the surface, close to the optical axis, of the image side is a concave surface, the off-axis place on the surface of the image side contains at least one convex surface, and both the object side surface and the image side surface are aspheric surfaces. When specific conditions are met, the miniaturization of the imaging-used optical system can be maintained, and the feature of a short total length when configuration requirements of a large aperture and a large viewing angle are considered. The invention also discloses an image capturing device comprising the above imaging optical system and an electronic device with the image capturing device.
Application Domain
Optical elements
Technology Topic
PhysicsImage capture +8
Image
Examples
- Experimental program(10)
Example
[0111]
[0112] Please refer to figure 1 and figure 2 ,among them figure 1 A schematic diagram of an image capturing device according to the first embodiment of the present invention is shown, figure 2 From left to right, the spherical aberration, astigmatism and distortion curves of the first embodiment are shown in sequence. by figure 1 It can be seen that the imaging device of the first embodiment includes an imaging optical system (not marked separately) and an electronic photosensitive element 190. The imaging optical system includes a first lens 110, an aperture 100, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, and an infrared filter in order from the object side to the image side. The optical element (IR-cut filter) 170 and the imaging surface 180, and the electronic photosensitive element 190 is arranged on the imaging surface 180 of the imaging optical system, wherein the imaging optical system has six lenses (110-160), any two adjacent There is an air gap between the lenses.
[0113] The first lens 110 has a positive refractive power and is made of plastic. The object side surface 111 is convex near the optical axis, and the image side surface 112 is convex near the optical axis, and both are aspherical.
[0114] The second lens 120 has a negative refractive power and is made of plastic. Its object side surface 121 is flat near the optical axis, and its image side surface 122 is concave near the optical axis, and both are aspherical.
[0115] The third lens 130 has a positive refractive power and is made of plastic. The object side surface 131 is convex near the optical axis, and the image side surface 132 is concave near the optical axis, and both are aspherical.
[0116] The fourth lens 140 has a negative refractive power and is made of plastic. Its object side surface 141 is convex near the optical axis, and its image side surface 142 is concave near the optical axis, and both are aspherical. In addition, the off-axis location of the object side surface 141 and the off-axis location of the image side surface 142 of the fourth lens include at least one inflection point.
[0117] The fifth lens 150 has a positive refractive power and is made of plastic. The object side surface 151 is convex near the optical axis, and the image side surface 152 is convex near the optical axis, and both are aspherical.
[0118] The sixth lens 160 has a negative refractive power and is made of plastic. Its object side surface 161 is concave near the optical axis, and its image side surface 162 is concave near the optical axis, and both are aspherical. In addition, the image side surface 162 of the sixth lens includes at least one convex surface off-axis.
[0119] The infrared ray filter element 170 is made of glass, which is arranged between the sixth lens 160 and the imaging surface 180 and does not affect the focal length of the imaging optical system.
[0120] The curve equations of the aspheric surfaces of the above lenses are expressed as follows:
[0121]
[0122] among them:
[0123] X: The point on the aspheric surface from the optical axis Y, the relative distance between it and the tangent plane tangent to the intersection on the optical axis of the aspheric surface;
[0124] Y: the vertical distance between the point on the aspheric curve and the optical axis;
[0125] R: radius of curvature;
[0126] k: Cone coefficient; and
[0127] Ai: the i-th aspheric coefficient.
[0128] In the imaging optical system of the first embodiment, the focal length of the imaging optical system is f, the aperture value of the imaging optical system is Fno, half of the maximum angle of view in the imaging optical system is HFOV, and the value is as follows: f=4.08mm ; Fno=2.13; and HFOV=38.0 degrees.
[0129] In the imaging optical system of the first embodiment, the dispersion coefficient of the third lens 130 is V3, and the dispersion coefficient of the fourth lens 140 is V4, which satisfies the following condition: V3/V4=2.37.
[0130] In the imaging optical system of the first embodiment, the thickness of the third lens 130 on the optical axis is CT3, and the thickness of the fourth lens 140 on the optical axis is CT4, which satisfies the following condition: CT4/CT3=0.71.
[0131] In the imaging optical system of the first embodiment, the thickness of the third lens 130 on the optical axis is CT3, the thickness of the fourth lens 140 on the optical axis is CT4, and the thickness of the fifth lens 150 on the optical axis is CT5. It satisfies the following conditions: CT5/(CT3+CT4)=1.11.
[0132] In the imaging optical system of the first embodiment, the thickness of the fourth lens 140 on the optical axis is CT4, and the separation distance between the third lens 130 and the fourth lens 140 on the optical axis is T34, which meets the following conditions: CT4/ T34=1.42.
[0133] In the imaging optical system of the first embodiment, the maximum image height of the imaging optical system is ImgH, and the entrance pupil diameter of the imaging optical system is EPD, which satisfies the following condition: ImgH/EPD=1.70.
[0134] In the imaging optical system of the first embodiment, the distance from the object side surface 111 of the first lens to the image side surface 162 of the sixth lens on the optical axis is Td, and the maximum image height of the imaging optical system is ImgH, which satisfies the following conditions : Td/ImgH=1.17.
[0135] In the imaging optical system of the first embodiment, the radius of curvature of the image side surface 132 of the third lens is R6, the radius of curvature of the image side surface 142 of the fourth lens is R8, and the focal length of the imaging optical system is f, which satisfies the following conditions : (|R6|+|R8|)/f=3.36.
[0136] In the imaging optical system of the first embodiment, the radius of curvature of the object side surface 151 of the fifth lens is R9, and the radius of curvature of the fifth lens image side surface 152 is R10, which satisfies the following condition: (R9+R10)/(R9 -R10)=0.74.
[0137] In the imaging optical system of the first embodiment, the focal length of the imaging optical system is f, and the radius of curvature of the image side surface 132 of the third lens is R6, which satisfies the following condition: f/R6=0.38.
[0138] In the imaging optical system of the first embodiment, the focal length of the imaging optical system is f, the focal length of the third lens 130 is f3, and the focal length of the fourth lens 140 is f4, which satisfies the following conditions: |f/f3|+| f/f4|=0.21.
[0139] In the imaging optical system of the first embodiment, the focal length of the first lens 110 is f1, the focal length of the third lens 130 is f3, the focal length of the fourth lens 140 is f4, the focal length of the fifth lens 150 is f5, and the focal length of the sixth lens The focal length of 160 is f6, where |f3| and |f4| are greater than |f1|, |f5| and |f6|, and |f1| is greater than |f5| and |f6|. (Refer to Table 1 below, |f3|=60.51, |f4|=29.59, |f1|=2.92, |f5|=2.76, |f6|=2.19.)
[0140] Refer to Table 1 and Table 2 below for cooperation.
[0141]
[0142]
[0143]
[0144] Table 1 is figure 1 In the detailed structure data of the first embodiment, the units of the radius of curvature, thickness and focal length are mm, and the surface 0-16 indicates the surface from the object side to the image side in sequence. Table 2 is the aspheric surface data in the first embodiment, where k represents the conical surface coefficient in the aspheric curve equation, and A4-A16 represent the 4th-16th order aspheric surface coefficients of each surface. In addition, the following embodiment tables correspond to the schematic diagrams and aberration curve diagrams of the respective embodiments, and the definitions of the data in the tables are the same as those in Table 1 and Table 2 of the first embodiment, and will not be repeated here.
Example
[0145]
[0146] Please refer to image 3 and Figure 4 ,among them image 3 A schematic diagram of an image capturing device according to the second embodiment of the present invention is shown, Figure 4 From left to right, the spherical aberration, astigmatism and distortion curves of the second embodiment are shown in sequence. by image 3 It can be seen that the imaging device of the second embodiment includes an imaging optical system (not marked separately) and an electronic photosensitive element 290. The imaging optical system includes an aperture 200, a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, a fifth lens 250, a sixth lens 260, and an infrared filter in order from the object side to the image side. The optical element 270 and the imaging surface 280, and the electronic photosensitive element 290 is arranged on the imaging surface 280 of the imaging optical system. The imaging optical system has six lenses (210-260), and there is an air between any two adjacent lenses. gap.
[0147] The first lens 210 has a positive refractive power and is made of plastic. The object side surface 211 is convex near the optical axis, and the image side surface 212 is concave near the optical axis, and both are aspherical.
[0148] The second lens 220 has a negative refractive power and is made of plastic material. The object side surface 221 is concave near the optical axis, and the image side surface 222 is concave near the optical axis, and both are aspherical.
[0149] The third lens 230 has a positive refractive power and is made of plastic material. The object side surface 231 is convex near the optical axis, and the image side surface 232 is concave near the optical axis, and both are aspherical.
[0150] The fourth lens 240 has a positive refractive power and is made of plastic. The object side surface 241 is convex near the optical axis, and the image side surface 242 is concave near the optical axis, and both are aspherical. In addition, both the off-axis position of the object side surface 241 and the off-axis position of the image side surface 242 of the fourth lens include at least one inflection point.
[0151] The fifth lens 250 has a positive refractive power and is made of plastic. The object side surface 251 is convex near the optical axis, and the image side surface 252 is convex near the optical axis, and both are aspherical.
[0152] The sixth lens 260 has a negative refractive power and is made of plastic. Its object side surface 261 is concave near the optical axis, and its image side surface 262 is concave near the optical axis, and both are aspherical. In addition, the image side surface 262 of the sixth lens includes at least one convex surface off-axis.
[0153] The infrared ray filter element 270 is made of glass, which is arranged between the sixth lens 260 and the imaging surface 280 and does not affect the focal length of the imaging optical system.
[0154] In addition, in the imaging optical system of the second embodiment, the focal length of the first lens 210 is f1, the focal length of the third lens 230 is f3, the focal length of the fourth lens 240 is f4, the focal length of the fifth lens 250 is f5, The focal length of the six lens 260 is f6, where |f3| and |f4| are greater than |f1|, |f5| and |f6|, and |f1| is greater than |f5| and |f6|.
[0155] Refer to Table 3 and Table 4 below for cooperation.
[0156]
[0157]
[0158]
[0159] In the second embodiment, the curve equation of the aspheric surface is expressed as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and will not be repeated here.
[0160] With Table 3 and Table 4, the following data can be calculated:
[0161]
Example
[0162]
[0163] Please refer to Figure 5 and Image 6 ,among them Figure 5 A schematic diagram of an image capturing device according to the third embodiment of the present invention is shown, Image 6 From left to right, the spherical aberration, astigmatism and distortion curves of the third embodiment are shown in sequence. by Figure 5 It can be seen that the imaging device of the third embodiment includes an imaging optical system (not marked separately) and an electronic photosensitive element 390. The imaging optical system includes an aperture 300, a first lens 310, a second lens 320, an aperture 301, a third lens 330, a fourth lens 340, a fifth lens 350, and a sixth lens 360 in order from the object side to the image side. The infrared filter element 370 and the imaging surface 380, and the electronic photosensitive element 390 is arranged on the imaging surface 380 of the imaging optical system, where the imaging optical system has six lenses (310-360), and any two adjacent lenses There is an air gap between.
[0164] The first lens 310 has a positive refractive power and is made of plastic. Its object side surface 311 is convex near the optical axis, and its image side surface 312 is concave near the optical axis, and both are aspherical.
[0165] The second lens 320 has a negative refractive power and is made of plastic. Its object side surface 321 is convex near the optical axis, and its image side surface 322 is concave near the optical axis, and both are aspherical.
[0166] The third lens 330 has a positive refractive power and is made of plastic. The object side surface 331 is convex near the optical axis, and the image side surface 332 is concave near the optical axis, and both are aspherical.
[0167] The fourth lens 340 has a negative refractive power and is made of plastic material. The object side surface 341 is convex near the optical axis, and the image side surface 342 is concave near the optical axis, and both are aspherical. In addition, both the off-axis position of the object side surface 341 and the off-axis position of the image side surface 342 of the fourth lens include at least one inflection point.
[0168] The fifth lens 350 has a positive refractive power and is made of plastic. The object side surface 351 is convex near the optical axis, and the image side surface 352 is convex near the optical axis, and both are aspherical.
[0169] The sixth lens 360 has a negative refractive power and is made of plastic. Its object side surface 361 is concave near the optical axis, and its image side surface 362 is concave near the optical axis, and both are aspherical. In addition, the image side surface 362 of the sixth lens includes at least one convex surface off-axis.
[0170] The infrared ray filter element 370 is made of glass, which is arranged between the sixth lens 360 and the imaging surface 380 and does not affect the focal length of the imaging optical system.
[0171] In addition, in the imaging optical system of the third embodiment, the focal length of the first lens 310 is f1, the focal length of the third lens 330 is f3, the focal length of the fourth lens 340 is f4, and the focal length of the fifth lens 350 is f5. The focal length of the six lens 360 is f6, where |f3| and |f4| are greater than |f1|, |f5| and |f6|, and |f1| is greater than |f5| and |f6|.
[0172] Refer to Table 5 and Table 6 below for cooperation.
[0173]
[0174]
[0175]
[0176] In the third embodiment, the curve equation of the aspheric surface is expressed as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and will not be repeated here.
[0177] With Table 5 and Table 6, the following data can be calculated:
[0178]
PUM
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