Abstract:
An optical lens assembly includes, in order from an object side to an image side, a first lens element with positive refractive power having a convex object-side surface, a second lens element with negative refractive power having a concave object-side surface and a convex image-side surface, a third lens element with positive refractive power having a convex object-side surface and a convex image-side surface. By adjusting the conditions among the above-mentioned lens elements, the optical lens assembly can favorably reduce its size and correct the aberration while obtaining superior imaging quality.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This non-provisional application claims priority under 35 U.S.C. §119(a) on Patent Application No(s). 100102909 filed in Taiwan, R.O.C. on Jan. 26, 2011, the entire contents of which are hereby incorporated by reference. 
     BACKGROUND 
     1. Technical Field 
     The present disclosure relates to an optical lens assembly, and more particularly to a compact optical lens assembly. 
     2. Related Art 
     In recent years, the optical lens assembly is used in a variety of application fields, especially in mobile phones, webcams, cars, surveillance cameras and electronic entertainment industries. The photo-sensing device, e.g. a sensor, of an ordinary optical lens assembly is commonly selected from a charge coupled device (CCD) and a complementary metal-oxide semiconductor (CMOS). In addition, as the advanced semiconductor manufacturing technology enables the miniaturization of pixel size of sensors, the resolution of a compact optical lens assembly is gradually increased. Such improvement leads to demands for compact optical assemblies featuring the ability of forming high-quality image on an image sensor. 
     A conventional camera lens used in mobile phones usually consists of three lens elements. In U.S. Pat. No. 6,490,102, for example, an optical lens system for taking image which consists of glass and plastic lens elements is disclosed. In the optical lens system, the third lens element is a spherical glass lens element. However, the spherical glass lens element reduces the freedom available for correcting the aberration of the optical lens system, which makes the camera lens more difficult to control the image quality. 
     Moreover, U.S. Pat. No. 7,262,925 discloses an image lens array consisting of three lens elements, wherein the stop is disposed between the first lens element and the second lens elements. Hence, the optical length of the image lens array is increased, which does not meet the demand of having a compact image lens array. 
     SUMMARY 
     According to an embodiment of the present disclosure, an optical lens assembly comprises, in order from an object side to an image side: a first lens element with positive refractive power having a convex object-side surface, a second lens element with negative refractive power having a concave object-side surface and a convex image-side surface, and a third lens element with positive refractive power having a convex object-side surface and a convex image-side surface. 
     Wherein, T 12  is the axial distance between the first lens element and the second lens element; CT 1  is the central thickness of the first lens element; f 1  is the focal length of the first lens element; R 2  is the radius of curvature of the image-side surface of the first lens element; CT 3  is the central thickness of the third lens element, and ΣCT is the sum of the central thicknesses of the first lens element, the second lens element, and the third lens element. The optical lens assembly satisfies the following conditions:
 
0.9&lt; T   12   /CT   1 &lt;1.4  (Condition 1)
 
−0.4&lt; f   1   /R   2 &lt;0.6  (Condition 2)
 
0.45&lt; CT   3   /ΣCT&lt; 0.75  (Condition 3)
 
     According to another embodiment of the present disclosure, an optical lens assembly comprises, in order from an object side to an image side: a first lens element with positive refractive power having a convex object-side surface, a second lens element with negative refractive power having a concave object-side surface and a convex image-side surface, and a third lens element with positive refractive power having a convex object-side surface and a convex image-side surface. 
     Wherein, R 1  is the radius of curvature of the object-side surface of the first lens element; R 2  is the radius of curvature of the image-side surface of the first lens element; f is the focal length of the optical lens assembly; f 1  is the focal length of the first lens element; CT 3  is the central thickness of the third lens element; ΣCT is the sum of the central thicknesses of the first lens element, the second lens element, and the third lens element; V 1  is the Abbe number of the first lens element, and V 2  is the Abbe number of the second lens element. The optical lens assembly satisfies the following conditions:
 
0.45&lt; CT   3   /ΣCT&lt; 0.75  (Condition 3)
 
−0.20&lt; R   1   /R   2 &lt;0.25  (Condition 4)
 
0.95&lt; f/f   1 &lt;1.35  (Condition 5)
 
30.0&lt; V   1   −V   2 &lt;47.0  (Condition 6)
 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present disclosure will become more fully understood from the following detailed description when taken in connection with the accompanying drawings, which show, for purpose of illustrations only, and thus do not limit other possible embodiments derived from the spirit of the present disclosure, and wherein: 
         FIG. 1A  is a schematic structural view of a first embodiment of an optical lens assembly according to the present disclosure; 
         FIG. 1B  is a schematic view of longitudinal spherical aberration curves when the lights having wavelengths of 486.1 nm, 587.6 nm, and 656.3 nm are respectively projected in the optical lens assembly in  FIG. 1A ; 
         FIG. 1C  is a schematic view of astigmatic field curves when the light having the wavelength of 587.6 nm is projected in the optical lens assembly in  FIG. 1A ; 
         FIG. 1D  is a schematic view of a distortion curve when the light having the wavelength of 587.6 nm is projected in the optical lens assembly in  FIG. 1A ; 
         FIG. 2A  is a schematic structural view of a second embodiment of an optical lens assembly according to the present disclosure; 
         FIG. 2B  is a schematic view of longitudinal spherical aberration curves when the lights having wavelengths of 486.1 nm, 587.6 nm, and 656.3 nm are respectively projected in the optical lens assembly in  FIG. 2A ; 
         FIG. 2C  is a schematic view of astigmatic field curves when the light having the wavelength of 587.6 nm is projected in the optical lens assembly in  FIG. 2A ; 
         FIG. 2D  is a schematic view of a distortion curve when the light having the wavelength of 587.6 nm is projected in the optical lens assembly; 
         FIG. 3A  is a schematic structural view of a third embodiment of an optical lens assembly according to the present disclosure; 
         FIG. 3B  is a schematic view of longitudinal spherical aberration curves when the lights having wavelengths of 486.1 nm, 587.6 nm, and 656.3 nm are respectively projected in the optical lens assembly in  FIG. 3A ; 
         FIG. 3C  is a schematic view of astigmatic field curves when the light having the wavelength of 587.6 nm is projected in the optical lens assembly in  FIG. 3A ; 
         FIG. 3D  is a schematic view of a distortion curve when the light having the wavelength of 587.6 nm is projected in the optical lens assembly in  FIG. 3A ; 
         FIG. 4A  is a schematic structural view of a fourth embodiment of an optical lens assembly according to the present disclosure; 
         FIG. 4B  is a schematic view of longitudinal spherical aberration curves when the lights having wavelengths of 486.1 nm, 587.6 nm, and 656.3 nm are respectively projected in the optical lens assembly in  FIG. 4A ; 
         FIG. 4C  is a schematic view of astigmatic field curves when the light having the wavelength of 587.6 nm is projected in the optical lens assembly in  FIG. 4A ; 
         FIG. 4D  is a schematic view of a distortion curve when the light having the wavelength of 587.6 nm is projected in the optical lens assembly in  FIG. 4A ; 
         FIG. 5A  is a schematic structural view of a fifth embodiment of an optical lens assembly according to the present disclosure; 
         FIG. 5B  is a schematic view of longitudinal spherical aberration curves when the lights having wavelengths of 486.1 nm, 587.6 nm, and 656.3 nm are respectively projected in the optical lens assembly in  FIG. 5A ; 
         FIG. 5C  is a schematic view of astigmatic field curves when the light having the wavelength of 587.6 nm is projected in the optical lens assembly in  FIG. 5A ; and 
         FIG. 5D  is a schematic view of a distortion curve when the light having the wavelength of 587.6 nm is projected in the optical lens assembly in  FIG. 5A . 
     
    
    
     DETAILED DESCRIPTION 
     The optical lens assembly of the present disclosure is described with  FIG. 1A  as an example, to illustrate that the embodiments have similar lens configurations and the same conditions of the optical lens assembly. The differences are described in detail in the following embodiments other than the embodiment described in  FIG. 1 . 
     Taking  FIG. 1A  as an example, the optical lens assembly  10  comprises, from an object side to an image side along an optical axis (from left to right in  FIG. 1A ) in sequence, a first lens element  110  with positive refractive power, a second lens element  120  with negative refractive power, and a third lens element  130  with positive refractive power. 
     The first lens element  110  comprises a convex object-side surface  111  and an image-side surface  112 . The object-side surface  111  and the image-side surface  112  are aspheric. 
     The second lens element  120  comprises a concave object-side surface  121  and a convex image-side surface  122 . The second lens element  120  can be made of plastic. The object-side surface  121  and the image-side surface  122  are aspheric. 
     The third lens element  130  comprises a convex object-side surface  131  and a convex image-side  132 . 
     The optical lens assembly  10  of the present disclosure satisfies the following conditions:
 
0.9&lt; T   12   /CT   1 &lt;1.4  (Condition 1)
 
−0.4&lt; f   1   /R   2 &lt;0.6  (Condition 2)
 
0.45&lt; CT   3   /ΣCT&lt; 0.75  (Condition 3)
 
−0.20&lt; R   1   /R   2 &lt;0.25  (Condition 4)
 
0.95&lt; f/f   1 &lt;1.35  (Condition 5)
 
30.0&lt; V   1   −V   2 &lt;47.0  (Condition 6)
 
     T 12  is the axial distance between the image-side surface  112  and the object-side surface  121 ; CT 1  is the central thickness of the first lens element  110 ; f 1  is the focal length of the first lens element  110 ; R 2  is the radius of curvature of the image-side surface  112 ; CT 3  is the central thickness of the third lens element  130 ; ΣCT is the sum of the central thicknesses of the first lens element  110 , the second lens element  120 , and the third lens element  130 ; R 1  is the radius of curvature of the object-side surface  111 ; f is the focal length of the optical lens assembly  10 ; V 1  is the Abbe number of the first lens element  110 , and V 2  is the Abbe number of the second lens element  120 . 
     In the optical lens assembly  10 , the first lens element  110  with positive refractive power provides part of the refractive power needed by the optical lens assembly  10  and reduces the total optical length. The second lens element  120  with negative refractive power can correct the aberration and the chromatism of the optical lens assembly  10 . The third lens element  130  with positive refractive power provides the positive refractive power along with the first lens element  110  to reduce the sensitivity of the optical lens assembly  10 . 
     Furthermore, when the first lens element  110  has the convex object-side surface  111 , the refractive power of the first lens element  110  can be distributed effectively, thereby reducing the total optical length of the optical lens assembly  10 . When the second lens element  120  has the concave object-side surface  121  and the convex image-side surface  122 , the astigmatism of the optical lens assembly  10  can be corrected. When the third lens element  130  has the convex object-side surface  131  and the convex image-side surface  132 , the total optical length of the optical lens assembly  10  is reduced. 
     When the optical lens assembly satisfies  10  Condition 1, the first lens element  110  has the appropriate central thickness and the appropriate axial distance between the image-side surface  112  and the object-side surface  121 , which helps reduce the total optical length of the optical lens assembly  10 . When the optical lens assembly  10  satisfies Condition 2, the object-side surface  111  has the appropriate radius of curvature, which helps reduce the total optical length of the optical lens assembly  10 . When the optical lens assembly  10  satisfies Condition 3, the third lens element  130  has the appropriate central thickness, which benefits the assembling process of the optical lens assembly  10 . 
     When the optical lens assembly  10  satisfies Condition 4, the radii of curvature of the object-side surface  111  and the image-side surface  112  are appropriate for correcting the spherical aberration of the optical lens assembly  10 . When the optical lens assembly  10  satisfies Condition 5, the refractive power of the first lens element  110  is well balanced, and, therefore, the total optical length of the optical lens assembly  10  can be effectively controlled to maintain the purpose of miniaturizing the optical lens assembly  10 . In addition, such well balanced refractive power of the first lens element  110  can also prevent the excessive increase of the high order spherical aberration of the optical lens assembly  10  and improve the image quality of the optical lens assembly  10 . When the optical lens assembly  10  satisfies Condition 6, correcting the chromatism of the optical lens assembly  10  is achieved. 
     Besides, the optical lens assembly  10  according to the present disclosure further comprises a stop, which can be an aperture stop  100 , disposed between the object-side (as shown the left side in  FIG. 1A ) and the first lens element  110 . The optical lens assembly  10  further comprises, in the right side of the third lens element  130  along the optical axis (from left to right in  FIG. 1A ) in sequence, an infrared filter  140 , an image plane  150 , and an image sensor  152  disposed on the image plane  150 . 
     Moreover, the optical lens assembly  10  of the present disclosure may further satisfy at least one of the following conditions:
 
−6.0&lt;( R   3   +R   4 )/( R   3   −R   4 )&lt;−3.0  (Condition 7)
 
0.05&lt; CT   2   /CT   3 &lt;0.4  (Condition 8)
 
0.9&lt;| f   1   /f   2 |&lt;1.2  (Condition 9)
 
0.9&lt; SL/TTL&lt; 1.1  (Condition 10)
 
−0.15&lt; R   3   /f&lt;− 0.05  (Condition 11)
 
0&lt; CT   2   /f&lt; 0.13  (Condition 12)
 
−1.0&lt; f/R   6 &lt;−0.2  (Condition 13)
 
 TTL /Img H&lt; 1.85  (Condition 14)
 
     R 3  is the radius of curvature of the object-side surface  121 ; R 4  is the radius of curvature of the image-side surface  122 ; CT 2  is the central thickness of the second lens element  120 ; f 2  is the focal length of the second lens element  120 ; SL is the axial distance between the aperture stop  100  and the image plane  150 ; TTL is the axial distance between the object-side surface  111  and the image plane  150 ; R 6  is the radius of curvature of the image-side surface  132 , and ImgH is one half of the diagonal length of the effective photosensitive area of the image sensor  152 . 
     In this and some embodiments, the central thicknesses CT 1 , CT 2  and CT 3  are the thicknesses of the first lens element  110 , the second lens element  120  and the third lens element  130  on the optical axis respectively. 
     When the optical lens assembly  10  of the present disclosure satisfies Condition 7, the object-side surface  121  and the image-side surface  122  have the appropriate radii of curvature which help correct the astigmatism and the high order aberration of the optical lens assembly  10 . When the optical lens assembly  10  of the present disclosure satisfies Condition 8, the second lens element  120  and the third lens element  130  have the appropriate central thicknesses which benefit the assembling process of optical lens assembly  10 . When the optical lens assembly  10  of the present disclosure satisfies Condition 9, the second lens element  120  has the appropriate negative refractive power which helps correct the aberration. When the optical lens assembly  10  of the present disclosure satisfies Condition 10, the position of the aperture stop  100  is favorable to reduce the total optical length of the optical lens assembly  10  and help the optical lens assembly  10  obtain the optimum telecentric feature of the image side. When the optical lens assembly  10  of the present disclosure satisfies Condition 11, the aberration of the optical lens assembly  10  is corrected. When the optical lens assembly  10  of the present disclosure satisfies Condition 12, the second lens element  120  has the appropriate central thickness, thereby reducing the total optical length of the optical lens assembly  10 . 
     When the optical lens assembly  10  of the present disclosure satisfies Condition 13, the total optical length of the optical lens assembly  10  is reduced. When the optical lens assembly  10  of the present disclosure satisfies Condition 14, the optical lens assembly  10  can maintain a compact size which is favorable for the installation of the optical lens assembly  10  into the mobile electronic devices. 
     In the optical lens assembly  10  according to the present disclosure, there is at least one inflection point  123  on the radial section of the second lens element  120 , such that the incident angle at which the light is projected onto the image plane  150  from the off-axis field can be reduced to further correct the off-axis aberrations. 
     Furthermore, in the optical lens assembly  10  of the present disclosure, all the lenses may be made of glass or plastic. If a lens is made of glass, there is more freedom in distributing the refractive power for the optical lens assembly  10 . If a lens element is made of plastic, the manufacturing cost is effectively reduced. In addition, the surfaces of lens elements can be aspheric. Aspheric profiles allow more design parameter freedom for reducing aberrations and total number of the lens elements, so that the total optical length of the optical lens assembly  10  can be reduced effectively. 
     In the optical lens assembly  10  of the present disclosure, a convex surface means the surface is convex at a paraxial site. A concave surface means the surface is concave at a paraxial site. In addition, at least one stop (such as glare stops, field stops, or other types of stops) may be disposed within the optical imaging system  10  if necessary to eliminate the stray light, to adjust the field of view or to provide other improvements concerning the image quality. 
     As for the optical lens assembly  10  of the present disclosure, the specific schemes are further described with the following embodiments. Parameters in the embodiments are defined as follows. Fno is an f-number value of the optical lens assembly, and HFOV is a half of a maximal viewing angle in the optical lens assembly. The aspheric surface in the embodiments may be represented by, but not limited to, the following aspheric surface equation (Condition ASP): 
     
       
         
           
             
               X 
               ⁡ 
               
                 ( 
                 Y 
                 ) 
               
             
             = 
             
               
                 
                   ( 
                   
                     
                       Y 
                       2 
                     
                     / 
                     R 
                   
                   ) 
                 
                 / 
                 
                   ( 
                   
                     1 
                     + 
                     
                       sqrt 
                       ⁡ 
                       
                         ( 
                         
                           1 
                           - 
                           
                             
                               ( 
                               
                                 1 
                                 + 
                                 k 
                               
                               ) 
                             
                             * 
                             
                               
                                 ( 
                                 
                                   Y 
                                   / 
                                   R 
                                 
                                 ) 
                               
                               2 
                             
                           
                         
                         ) 
                       
                     
                   
                   ) 
                 
               
               + 
               
                 
                   ∑ 
                   i 
                 
                 ⁢ 
                 
                     
                 
                 ⁢ 
                 
                   
                     ( 
                     Ai 
                     ) 
                   
                   * 
                   
                     ( 
                     
                       Y 
                       i 
                     
                     ) 
                   
                 
               
             
           
         
       
     
     Wherein Y is the distance from the point on the curve of the aspheric surface to the optical axis, X is the height of a point on the aspheric surface at a distance Y from the optical axis relative to the tangential plane at the aspheric surface vertex, k is a conic factor, Ai is an i th  order aspheric surface coefficient, and in the embodiments, i may be, but is not limited to, 4, 6, 8, 10, and 12. 
     The First Embodiment 
     Embodiment 1 
       FIG. 1A  is a schematic structural view of a first embodiment of an optical lens assembly according to the present disclosure. In this embodiment, the wavelength of the light received by the optical lens assembly  10  is 587.6 nm, but the wavelength of the light received by the optical lens assembly  10  may be adjusted according to actual requirements, and is not limited to the wavelength value mentioned above. 
     In this embodiment, the first lens element  110  with the positive refractive power comprises the convex object-side surface  111 . The second lens element  120  with the negative refractive power comprises the concave object-side surface  121 , the convex image-side surface  122 , and two inflection points  123  on the radial section of the second lens element  120  shown in  FIG. 1A . The third lens element  130  with the positive refractive power comprises the convex object-side surface  131  and the convex image-side surface  132 . 
     The detailed data of the optical lens assembly  10  is as shown in Table 1-1 below. 
     
       
         
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 1-1 
               
             
             
               
                   
               
               
                 Embodiment 1 
               
               
                 f = 4.37 mm, Fno = 2.85, HFOV = 37.5 deg. 
               
             
          
           
               
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 length 
               
               
                   
               
             
          
           
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Ape. Stop 
                 Plano 
                 −0.134 
               
               
                 2 
                 Lens 1 
                  1.807920 (ASP) 
                 0.657 
                 Plastic 
                 1.544 
                 55.9 
                 3.42 
               
               
                 3 
                   
                 53.969500 (ASP) 
                 0.746 
               
               
                 4 
                 Lens 2 
                 −0.553640 (ASP) 
                 0.285 
                 Plastic 
                 1.634 
                 23.8 
                 −3.58 
               
               
                 5 
                   
                 −0.878640 (ASP) 
                 0.073 
               
               
                 6 
                 Lens 3 
                  2.698350 (ASP) 
                 2.310 
                 Plastic 
                 1.535 
                 56.3 
                 4.57 
               
               
                 7 
                   
                 −18.071900 (ASP)  
                 0.600 
               
               
                 8 
                 IR-filter 
                 Plano 
                 0.700 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 9 
                   
                 Plano 
                 0.712 
               
               
                 10 
                 Image 
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is d-line 587.6 nm 
               
             
          
         
       
     
     In Table 1-1, the first lens element  110 , the second lens element  120 , and the third lens element  130  are made of plastic. The first lens element  110 , the second lens element  120 , and the third lens element  130  are aspheric, and the aspheric surfaces can satisfy Condition ASP, but are not limited thereto. As for the parameters of the aspheric surfaces, reference is made to Table 1-2 below. 
     
       
         
               
             
               
               
             
               
               
               
               
               
             
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 1-2 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 Surface# 
               
             
          
           
               
                   
                   
                 2 
                 3 
                 4 
               
               
                   
                   
               
               
                   
                 k 
                 −9.25079E+00 
                 0.00000E+00 
                 −1.21057E+00 
               
               
                   
                 A 4   
                 1.61459E−01 
                 −7.80223E−02 
                 8.57517E−02 
               
               
                   
                 A 6   
                 −1.85010E−01 
                 −2.04375E−01 
                 −6.22454E−02 
               
               
                   
                 A 8   
                 1.17771E−01 
                 2.11598E−01 
                 3.89978E−01 
               
               
                   
                 A 10   
                 −1.28998E−01 
                 −1.64901E−01 
                 −9.94783E−02 
               
               
                   
                 A 12   
                 1.87062E−02 
                 — 
                 −1.95944E−01 
               
               
                   
                   
               
             
          
           
               
                   
                 Surface# 
               
             
          
           
               
                   
                   
                 5 
                 6 
                 7 
               
               
                   
                   
               
               
                   
                 k 
                 −1.36572E+00 
                 −4.09976E+01 
                 −1.00000E+00 
               
               
                   
                 A 4   
                 −4.87802E−02 
                 −1.18620E−02 
                 −1.56659E−02 
               
               
                   
                 A 6   
                 3.15433E−01 
                 5.08726E−03 
                 5.45353E−04 
               
               
                   
                 A 8   
                 −7.47962E−02 
                 −1.49233E−03 
                 1.19807E−04 
               
               
                   
                 A 10   
                 4.00796E−02 
                 2.93410E−04 
                 −3.99060E−05 
               
               
                   
                 A 12   
                 −3.80479E−02 
                 −2.44457E−05 
                 2.45702E−06 
               
               
                   
                   
               
             
          
         
       
     
     In Table 1-1, the curvature radius, the thickness and the focal length are shown in millimeters (mm). Surface numbers 0-10 represent the surfaces sequentially arranged from the object-side to the image-side along the optical axis. “f” stands for the focal length, “Fno” is the f-number, and “HFOV” is the half field of view of this embodiment. In Table 1-2, k represents the conic coefficient of the equation of the aspheric surface profiles. A1-A12 represent the aspheric coefficients ranging from the 1st order to the 12th. All labels for Tables of the remaining embodiments share the same definitions as those in Table 1-1 and Table 1-2 of the first embodiment, and their definitions will not be stated again. 
     The content of Table 1-3 may be deduced from Table 1-1. 
     
       
         
               
             
               
               
               
               
               
             
           
               
                 TABLE 1-3 
               
               
                   
               
               
                 Embodiment 1 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 f (mm) 
                 4.37 
                 f 1 /R 2   
                 0.06 
               
               
                   
                 Fno 
                 2.85 
                 R 3 /f 
                 −0.13 
               
               
                   
                 HFOV(deg.) 
                 37.5 
                 R 1 /R 2   
                 0.03 
               
               
                   
                 V 1  − V 2   
                 32.1 
                 (R 3  + R 4 )/(R 3  − R 4 ) 
                 −4.41 
               
               
                   
                 SL/TTL 
                 0.98 
                 CT 2 /CT 3   
                 0.12 
               
               
                   
                 TTL/ImgH 
                 1.77 
                 CT 3 /ΣCT 
                 0.71 
               
               
                   
                 f/f 1   
                 1.28 
                 T 12 /CT 1   
                 1.135 
               
               
                   
                 |f 1 /f 2 | 
                 0.96 
                 CT 2 /f 
                 0.06 
               
               
                   
                 f/R 6   
                 −0.24 
               
               
                   
                   
               
             
          
         
       
     
     In this embodiment, the T 12 /CT 1  of the optical lens assembly  10  is 1.135, which satisfies the Condition 1. The f 1 /R 2  of the optical lens assembly  10  is 0.06, which satisfies the Condition 2. The CT 3 /ΣCT of the optical lens assembly  10  is 0.71, which satisfies the Condition 3. The R 1 /R 2  of the optical lens assembly  10  is 0.03, which satisfies the Condition 4. 
     The f/f 1  of the optical lens assembly  10  is 1.28, which satisfies the Condition 5. The V 1 −V 2  of the optical lens assembly  10  is 32.1, which satisfies the Condition 6. The (R 3 +R 4 )/(R 3 −R 4 ) of the optical lens assembly  10  is −4.41, which satisfies the Condition 7. The CT 2 /CT 3  of the optical lens assembly  10  is 0.12, which satisfies the Condition 8. The |f 1 /f 2 | of the optical lens assembly  10  is 0.96, which satisfies the Condition 9. The SL/TTL of the optical lens assembly  10  is 0.98, which satisfies the Condition 10. The R 3 /f of the optical lens assembly  10  is −0.13, which satisfies the Condition 11. The CT 2 /f of the optical lens assembly  10  is 0.06, which satisfies the Condition 12. The f/R 6  of the optical lens assembly  10  is −0.24, which satisfies the Condition 13. The TTL/ImgH of the optical lens assembly  10  is 1.77, which satisfies the Condition 14. 
       FIG. 1B  is a schematic view of longitudinal spherical aberration curves when the lights having wavelengths of 486.1 nm, 587.6 nm, and 656.3 nm are respectively projected in the optical lens assembly in  FIG. 1A . The longitudinal spherical aberration curve of the light having the wavelength of 486.1 nm in the optical lens assembly  10  is indicated by a solid line L in  FIG. 1B . The longitudinal spherical aberration curve of the light having the wavelength of 587.6 nm in the optical lens assembly  10  is indicated by a dashed line M in  FIG. 1B . The longitudinal spherical aberration curve of the light having the wavelength of 656.3 nm in the optical lens assembly  10  is indicated by a dotted line N in  FIG. 1B . Horizontal axis is the focus position (millimeter, mm), and vertical axis is the normalized entrance pupil or the aperture value. In other words, after the light enters the in the optical lens assembly  10 , the differences between of the focus positions of the paraxial light (the longitudinal coordinate is close to 0) and the fringe light (the longitudinal coordinate is close to 1) can be observed from the longitudinal spherical aberration curves. It can be observed from  FIG. 1B  that, no matter the wavelength of the light received by the optical lens assembly  10  in this embodiment is 486.1 nm, 587.6 nm, or 656.3 nm, the longitudinal spherical aberration generated by the optical lens assembly  10  is within the range of −0.025 mm to 0.075. 
     In the second embodiment to the fifth embodiment and the schematic views of the longitudinal spherical aberration curves in  FIGS. 2B ,  3 B,  4 B, and  5 B, the solid line L indicates the longitudinal spherical aberration curve of the light having the wavelength of 486.1 nm, the dashed line M indicates the longitudinal spherical aberration curve of the light having the wavelength of 587.6 nm, and the dotted line N indicates the longitudinal spherical aberration curve of the light having the wavelength of 656.3 nm, which will not be repeated herein for conciseness. 
       FIG. 1C  is a schematic view of astigmatic field curves when the light having the wavelength of 587.6 nm is projected in the optical lens assembly in  FIG. 1A . An astigmatic field curve of a tangential plane is a dashed line T in  FIG. 1C . An astigmatic field curve of a sagittal plane is a solid line S in  FIG. 1C . Horizontal axis is the focus position (mm), and vertical axis is the image height (mm). In other words, the differences of the focus positions due to different curvatures of the tangential plane and the sagittal plane can be seen from the astigmatic field curves. It can be observed from  FIG. 1C  that when the light having the wavelength of 587.6 nm is projected in the optical lens assembly  10 , the astigmatic field curvature of the tangential plane is within the range of 0.15 mm to 0.15 mm, and the astigmatic field curvature of the sagittal plane is within the range of −0.150 mm to 0.0 mm. 
     In the second embodiment to the fifth embodiment and the schematic views of the astigmatic field curves in  FIGS. 2C ,  3 C,  4 C, and  5 C, the solid line S indicates the astigmatic field curve of the sagittal plane, and the dashed line T indicates the astigmatic field curve of the tangential plane, which will not be repeated herein for conciseness. 
       FIG. 1D  is a schematic view of a distortion curve when the light having the wavelength of 587.6 nm is projected in the optical lens assembly in  FIG. 1A . The horizontal axis is the distortion ratio (%), and the vertical axis is the image height (mm). In other words, the differences of the distortion ratios caused by different image heights can be seen from the distortion curve G. It can be observed from  FIG. 1D  that, the distortion ratio generated when the light having the wavelength of 587.6 nm is projected in the optical lens assembly  10  is within a range of −3.0% to 0%. As shown in  FIGS. 1B to 1D , the optical lens assembly  10 , designed according to the first embodiment, is capable of effectively correcting various aberrations. 
     In the second embodiment to the fifth embodiment and the schematic views of the distortion curves in  FIGS. 2D ,  3 D,  4 D, and  5 D, the solid line G indicates the distortion curve of the light having the wavelength of 587.6 nm, which will not be repeated herein for conciseness. 
     It should be noted that, the distortion curves and the astigmatic field curves generated when the lights having the wavelength of 486.1 nm and 656.3 nm are projected in the optical lens assembly  10  are very similar to the distortion curve and the astigmatic field curves generated when the light having the wavelength of 587.6 nm is projected in the optical lens assembly  10 . In order to prevent the confusion of reading the curves in  FIGS. 1C and 1D , the distortion curve and the astigmatic field curves of wavelengths of 486.1 nm and 656.3 nm projected in the optical lens assembly  10  are not shown in FIGS.  1 C and  1 D, and the same is throughout the rest of the embodiments of this present disclosure. 
     The Second Embodiment 
     Embodiment 2 
       FIG. 2A  is a schematic structural view of a second embodiment of an optical lens assembly according to the present disclosure. The specific implementation and elements of the second embodiment are substantially the same as those in the first embodiment. The element symbols in the second embodiment all begin with “2”, which correspond to those in the first embodiment with the same function or structure. For conciseness, only the differences are illustrated below, and the similarities will not be repeated herein. 
     In this embodiment, for example, the wavelength of the light received by the optical lens assembly  20  is 587.6 nm, but this wavelength may be adjusted according to actual requirements, and is not limited to the wavelength value mentioned above. 
     In this embodiment, a first lens element  210  with positive refractive power comprises a convex object-side surface  211 . A second lens element  220  with negative refractive power comprises a concave object-side surface  221 , a convex image-side surface  222  and two inflection points  223  on the radial section of the second lens element  220  shown in  FIG. 2A . A third lens element  230  with positive refractive power comprises a convex object-side surface  231  and a convex image-side surface  232 . 
     The detailed data of the optical lens assembly  20  is as shown in Table 2-1 below. 
     
       
         
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 2-1 
               
             
             
               
                   
               
               
                 Embodiment 2 
               
               
                 f = 4.35 mm, Fno = 2.85, HFOV = 37.4 deg. 
               
             
          
           
               
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 length 
               
               
                   
               
             
          
           
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Ape. Stop 
                 Plano 
                 −0.123 
               
               
                 2 
                 Lens 1 
                  1.883190 (ASP) 
                 0.678 
                 Glass 
                 1.517 
                 64.2 
                 3.52 
               
               
                 3 
                   
                 −45.048900 (ASP)  
                 0.727 
               
               
                 4 
                 Lens 2 
                 −0.539470 (ASP) 
                 0.295 
                 Plastic 
                 1.634 
                 23.8 
                 −3.69 
               
               
                 5 
                   
                 −0.850140 (ASP) 
                 0.067 
               
               
                 6 
                 Lens 3 
                  2.974810 (ASP) 
                 1.800 
                 Plastic 
                 1.535 
                 56.3 
                 4.46 
               
               
                 7 
                   
                 −9.533000 (ASP) 
                 0.900 
               
               
                 8 
                 IR-filter 
                 Plano 
                 0.700 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 9 
                   
                 Plano 
                 0.904 
               
               
                 10 
                 Image 
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is d-line 587.6 nm 
               
             
          
         
       
     
     In Table 2-1, the first lens element  210  is made of glass. The second lens element  220  and the third lens element  230  are made of plastic. The first lens element  210 , the second lens element  220 , and the third lens element  230  are aspheric, and the aspheric surfaces can satisfy Condition ASP, but are not limited thereto. As for the parameters of the aspheric surfaces, reference is made to Table 2-2 below. 
     
       
         
               
             
               
               
             
               
               
               
               
               
             
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 2-2 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 Surface# 
               
             
          
           
               
                   
                   
                 2 
                 3 
                 4 
               
               
                   
                   
               
               
                   
                 k 
                 −1.01405E+01 
                 0.00000E+00 
                 −1.20993E+00 
               
               
                   
                 A 4   
                 1.55686E−01 
                 −8.55294E−02 
                 8.76213E−02 
               
               
                   
                 A 6   
                 −1.92088E−01 
                 −2.12825E−01 
                 −5.54582E−02 
               
               
                   
                 A 8   
                 1.11426E−01 
                 2.11752E−01 
                 4.01494E−01 
               
               
                   
                 A 10   
                 −1.26500E−01 
                 −1.47332E−01 
                 −8.56068E−02 
               
               
                   
                 A 12   
                 2.88333E−02 
                 — 
                 −1.90863E−01 
               
               
                   
                   
               
             
          
           
               
                   
                 Surface# 
               
             
          
           
               
                   
                   
                 5 
                 6 
                 7 
               
               
                   
                   
               
               
                   
                 k 
                 −1.37508E+00 
                 −4.65790E+01 
                 −1.00000E+00 
               
               
                   
                 A 4   
                 −4.83843E−02 
                 −1.40148E−02 
                 −1.40928E−02 
               
               
                   
                 A 6   
                 3.14696E−01 
                 5.04555E−03 
                 3.95746E−04 
               
               
                   
                 A 8   
                 −7.57069E−02 
                 −1.40177E−03 
                 9.70806E−05 
               
               
                   
                 A 10   
                 3.98389E−02 
                 3.15619E−04 
                 −4.19950E−05 
               
               
                   
                 A 12   
                 −3.69277E−02 
                 −3.35871E−05 
                 2.04656E−06 
               
               
                   
                   
               
             
          
         
       
     
     The content of Table 2-3 may be deduced from Table 2-1. 
     
       
         
               
             
               
               
               
               
               
             
           
               
                 TABLE 2-3 
               
               
                   
               
               
                 Embodiment 2 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 f (mm) 
                 4.35 
                 f 1 /R 2   
                 −0.08 
               
               
                   
                 Fno 
                 2.85 
                 R 3 /f 
                 −0.12 
               
               
                   
                 HFOV(deg.) 
                 37.4 
                 R 1 /R 2   
                 −0.04 
               
               
                   
                 V 1  − V 2   
                 40.4 
                 (R 3  + R 4 )/(R 3  − R 4 ) 
                 −4.47 
               
               
                   
                 SL/TTL 
                 0.98 
                 CT 2 /CT 3   
                 0.16 
               
               
                   
                 TTL/ImgH 
                 1.76 
                 CT 3 /ΣCT 
                 0.65 
               
               
                   
                 f/f 1   
                 1.24 
                 T 12 /CT 1   
                 1.072 
               
               
                   
                 |f 1 /f 2 | 
                 0.95 
                 CT 2 /f 
                 0.07 
               
               
                   
                 f/R 6   
                 −0.46 
               
               
                   
                   
               
             
          
         
       
     
       FIG. 2B  is a schematic view of longitudinal spherical aberration curves when the lights having wavelengths of 486.1 nm, 587.6 nm, and 656.3 nm are respectively projected in the optical lens assembly in  FIG. 2A . It can be observed from  FIG. 2B  that, when the different wavelengths, 486.1 nm, 587.6 nm, and 656.3 nm, of the light are received by the optical lens assembly  20 , the longitudinal spherical aberrations generated by the optical lens assembly  20  are within a range of −0.05 mm to 0.06 mm. 
       FIG. 2C  is a schematic view of astigmatic field curves when the light having the wavelength of 587.6 nm is projected in the optical lens assembly in  FIG. 2A . It can be observed from  FIG. 2C  that when the light having the wavelength of 587.6 nm is projected in the optical lens assembly  20 , the astigmatic field curvature of the tangential plane generated is within a range of −0.05 mm to 0.15 mm, and the astigmatic field curvature of the sagittal plane is within a range of −0.08 mm to 0.0 mm. 
       FIG. 2D  is a schematic view of a distortion curve when the light having the wavelength of 587.6 nm is projected in the optical lens assembly in  FIG. 2A . It can be observed from  FIG. 2D  that, the distortion ratio generated when the light having the wavelength of 587.6 nm is projected in the optical lens assembly  20  is within a range of 0.8% to 0%. As shown in  FIGS. 2B to 2D , the optical lens assembly  20 , designed according to the second embodiment, is capable of effectively correcting various aberrations. 
     The Third Embodiment 
     Embodiment 3 
       FIG. 3A  is a schematic structural view of a third embodiment of an optical lens assembly according to the present disclosure. The specific implementation and elements of the third embodiment are substantially the same as those in the first embodiment. The element symbols in the third embodiment all begin with “3”, which correspond to those in the first embodiment with the same function or structure. For conciseness, only the differences are illustrated below, and the similarities will not be repeated herein. 
     In this embodiment, for example, the wavelength of the light received by the optical lens assembly  30  is 587.6 nm, but the wavelength may be adjusted according to actual requirements, and is not limited to the wavelength value mentioned above. 
     In this embodiment, a first lens element  310  with positive refractive power comprises a convex object-side surface  311 . A second lens element  320  with negative refractive power comprises a concave object-side surface  321 , a convex image-side surface  322  and two inflection points  323  on the radial section of the second lens element  320  shown in  FIG. 3A . A third lens element  330  with positive refractive power comprises a convex object-side surface  331  and a convex image-side surface  332 . 
     The detailed data of the optical lens assembly  30  is as shown in Table 3-1 below. 
     
       
         
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 3-1 
               
             
             
               
                   
               
               
                 Embodiment 3 
               
               
                 f = 4.39 mm, Fno = 2.95, HFOV = 37.4 deg. 
               
             
          
           
               
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 length 
               
               
                   
               
             
          
           
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Ape. 
                 Plano 
                 −0.135 
               
               
                 2 
                 Lens 1 
                 1.760610 
                 0.635 
                 Glass 
                 1.517 
                 64.2 
                 3.92 
               
               
                 3 
                   
                 11.834300  
                 0.711 
               
               
                 4 
                 Lens 2 
                 −0.525590 (ASP) 
                 0.291 
                 Plastic 
                 1.634 
                 23.8 
                 −4.00 
               
               
                 5 
                   
                 −0.805340 (ASP) 
                 0.050 
               
               
                 6 
                 Lens 3 
                 3.868900 
                 1.443 
                 Plastic 
                 1.544 
                 55.9 
                 4.27 
               
               
                 7 
                   
                 −5.059900 (ASP) 
                 1.100 
               
               
                 8 
                 IR-filter 
                 Plano 
                 0.700 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 9 
                   
                 Plano 
                 1.271 
               
               
                 10 
                 Image 
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is d-line 587.6 nm 
               
             
          
         
       
     
     In Table 3-1, the first lens element  310  is made of glass. The second lens element  320  and the third lens element  330  are made of plastic. The first lens element  310 , the second lens element  320 , and the third lens element  330  are aspheric, and the aspheric surfaces can satisfy Condition ASP, but are not limited thereto. As for the parameters of the aspheric surfaces, reference is made to Table 3-2 below. 
     
       
         
               
             
               
               
             
               
               
               
               
               
             
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 3-2 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 Surface# 
               
             
          
           
               
                   
                   
                 2 
                 3 
                 4 
               
               
                   
                   
               
               
                   
                 k 
                 −9.14103E+00 
                 1.34758E+02 
                 −1.21765E+00 
               
               
                   
                 A 4   
                 1.63739E−01 
                 −7.78227E−02 
                 8.75891E−02 
               
               
                   
                 A 6   
                 −1.79024E−01 
                 −2.07500E−01 
                 −6.34442E−02 
               
               
                   
                 A 8   
                 1.31365E−01 
                 2.02061E−01 
                 3.87660E−01 
               
               
                   
                 A 10   
                 −9.63247E−02 
                 −1.82592E−01 
                 −1.01609E−01 
               
               
                   
                 A 12   
                 9.24424E−03 
                 — 
                 −2.12892E−01 
               
               
                   
                   
               
             
          
           
               
                   
                 Surface# 
               
             
          
           
               
                   
                   
                 5 
                 6 
                 7 
               
               
                   
                   
               
               
                   
                 k 
                 −1.35828E+00 
                 −7.45242E+01 
                 −1.00000E+00 
               
               
                   
                 A 4   
                 −4.93372E−02 
                 −1.25879E−02 
                 −1.33268E−02 
               
               
                   
                 A 6   
                 3.15290E−01 
                 5.16175E−03 
                 3.17506E−04 
               
               
                   
                 A 8   
                 −7.49957E−02 
                 −1.44615E−03 
                 6.33543E−05 
               
               
                   
                 A 10   
                 3.97755E−02 
                 2.93241E−04 
                 −5.10778E−05 
               
               
                   
                 A 12   
                 −3.76869E−02 
                 −3.51199E−05 
                 1.07695E−08 
               
               
                   
                   
               
             
          
         
       
     
     The content of Table 3-3 may be deduced from Table 3-1. 
     
       
         
               
             
               
               
               
               
               
             
           
               
                 TABLE 3-3 
               
               
                   
               
               
                 Embodiment 3 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 f (mm) 
                 4.39 
                 f 1 /R 2   
                 0.33 
               
               
                   
                 Fno 
                 2.95 
                 R 3 /f 
                 −0.12 
               
               
                   
                 HFOV(deg.) 
                 37.4 
                 R 1 /R 2   
                 0.15 
               
               
                   
                 V 1  − V 2   
                 40.4 
                 (R 3  + R 4 )/(R 3  − R 4 ) 
                 −4.76 
               
               
                   
                 SL/TTL 
                 0.98 
                 CT 2 /CT 3   
                 0.20 
               
               
                   
                 TTL/ImgH 
                 1.81 
                 CT 3 /ΣCT 
                 0.61 
               
               
                   
                 f/f 1   
                 1.12 
                 T 12 /CT 1   
                 1.120 
               
               
                   
                 |f 1 /f 2 | 
                 0.98 
                 CT 2 /f 
                 0.07 
               
               
                   
                 f/R 6   
                 −0.87 
               
               
                   
                   
               
             
          
         
       
     
       FIG. 3B  is a schematic view of longitudinal spherical aberration curves when the lights having wavelengths of 486.1 nm, 587.6 nm, and 656.3 nm are respectively projected in the optical lens assembly in  FIG. 3A . It can be observed from  FIG. 3B  that, when the different wavelengths, 486.1 nm, 587.6 nm, and 656.3 nm, of the light are received by the optical lens assembly  30 , the longitudinal spherical aberrations generated by the optical lens assembly  30  are within a range of −0.05 mm to 0.05 mm. 
       FIG. 3C  is a schematic view of astigmatic field curves when the light having the wavelength of 587.6 nm is projected in the optical lens assembly in  FIG. 3A . It can be observed from  FIG. 3C  that, when the light having the wavelength of 587.6 nm is projected in the optical lens assembly  30 , the astigmatic field curvature of the tangential plane is within a range of −0.3 mm to 0.0 mm, and the astigmatic field curvature of the sagittal plane is within a range of −0.3 mm to 0.0 mm. 
       FIG. 3D  is a schematic view of a distortion curve when the light having the wavelength of 587.6 nm is projected in the optical lens assembly in  FIG. 3A . It can be observed from  FIG. 3D  that when the light having the wavelength of 587.6 nm is projected in the optical lens assembly  30 , the distortion ratio is within a range of −1.5% to 0%. As shown in  FIGS. 3B to 3D , the optical lens assembly  30 , designed according to the third embodiment, is capable of effectively correcting various aberrations. 
     The Fourth Embodiment 
     Embodiment 4 
       FIG. 4A  is a schematic structural view of a fourth embodiment of the optical lens assembly according to the present disclosure. The specific implementation and elements of the fourth embodiment are substantially the same as those in the first embodiment. The element symbols in the fourth embodiment all begin with “4”, which correspond to those in the first embodiment with the same function or structure. For conciseness, only the differences are illustrated below, and the similarities will not be repeated herein. 
     In this embodiment, for example, the wavelength of the light received by the optical lens assembly  40  is 587.6 nm, but the wavelength may be adjusted according to actual requirements, and is not limited to the wavelength value mentioned above. 
     In this embodiment, a first lens element  410  with positive refractive power comprises a convex object-side surface  411 . A second lens element  420  with negative refractive power comprises a concave object-side surface  421 , a convex image-side surface  422 , and two inflection points  423  on the radial section of the second lens element  420  shown in  FIG. 4A . A third lens element  430  with positive refractive power comprises a convex object-side surface  431  and a convex image-side surface  432 . 
     The detailed data of the optical lens assembly  40  is as shown in Table 4-1 below. 
     
       
         
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 4-1 
               
             
             
               
                   
               
               
                 Embodiment 4 
               
               
                 f = 4.37 mm, Fno = 2.95, HFOV = 37.5 deg. 
               
             
          
           
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Focal length 
               
               
                   
               
             
          
           
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Ape. Stop 
                 Plano 
                 −0.130 
               
               
                 2 
                 Lens 1 
                  1.772070 (ASP) 
                 0.607 
                 Glass 
                 1.487 
                 70.4 
                 4.14 
               
               
                 3 
                   
                 12.899600 (ASP) 
                 0.671 
               
               
                 4 
                 Lens 2 
                 −0.533650 (ASP) 
                 0.288 
                 Plastic 
                 1.634 
                 23.8 
                 −3.83 
               
               
                 5 
                   
                 −0.827360 (ASP) 
                 0.050 
               
               
                 6 
                 Lens 3 
                  3.554900 (ASP) 
                 1.100 
                 Plastic 
                 1.544 
                 55.9 
                 3.95 
               
               
                 7 
                   
                 −4.858700 (ASP) 
                 1.400 
               
               
                 8 
                 IR-filter 
                 Plano 
                 0.700 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 9 
                   
                 Plano 
                 1.300 
               
               
                 10 
                 Image 
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is d-line 587.6 nm 
               
             
          
         
       
     
     In Table 4-1, the first lens element  410  is made of glass. The second lens element  420  and the third lens element  430  are made of plastic. The first lens element  410 , the second lens element  420 , and the third lens element  430  are aspheric, and the aspheric surfaces can satisfy Condition ASP, but are not limited thereto. As for the parameters of the aspheric surfaces, reference is made to Table 4-2 below. 
     
       
         
               
             
               
               
             
               
               
               
               
               
             
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 4-2 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 Surface# 
               
             
          
           
               
                   
                   
                 2 
                 3 
                 4 
               
               
                   
                   
               
               
                   
                 k 
                 −8.99058E+00 
                 1.31889E+02 
                 −1.22197E+00 
               
               
                   
                 A 4   
                 1.65680E−01 
                 −7.55882E−02 
                 8.99769E−02 
               
               
                   
                 A 6   
                 −1.75630E−01 
                 −2.07759E−01 
                 −6.06304E−02 
               
               
                   
                 A 8   
                 1.33735E−01 
                 1.96559E−01 
                 3.90195E−01 
               
               
                   
                 A 10   
                 −1.00271E−01 
                 −1.96444E−01 
                 −9.84879E−02 
               
               
                   
                 A 12   
                 −2.37057E−02 
                 — 
                 −2.20814E−01 
               
               
                   
                   
               
             
          
           
               
                   
                 Surface# 
               
             
          
           
               
                   
                   
                 5 
                 6 
                 7 
               
               
                   
                   
               
               
                   
                 k 
                 −1.35553E+00 
                 −7.38999E+01 
                 −1.00000E+00 
               
               
                   
                 A 4   
                 −4.97502E−02 
                 −1.19814E−02 
                 −1.34324E−02 
               
               
                   
                 A 6   
                 3.14918E−01 
                 5.29529E−03 
                 3.96181E−04 
               
               
                   
                 A 8   
                 −7.53205E−02 
                 −1.42514E−03 
                 6.52057E−05 
               
               
                   
                 A 10   
                 3.92590E−02 
                 3.04293E−04 
                 −5.64498E−05 
               
               
                   
                 A 12   
                 −3.76787E−02 
                 −4.24574E−05 
                 −2.22587E−06 
               
               
                   
                   
               
             
          
         
       
     
     The content of Table 4-3 may be deduced from Table 4-1. 
     
       
         
               
             
               
               
               
               
               
             
           
               
                 TABLE 4-3 
               
               
                   
               
               
                 Embodiment 4 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 f (mm) 
                 4.37 
                 f 1 /R 2   
                 0.32 
               
               
                   
                 Fno 
                 2.95 
                 R 3 /f 
                 −0.12 
               
               
                   
                 HFOV(deg.) 
                 37.5 
                 R 1 /R 2   
                 0.14 
               
               
                   
                 V 1  − V 2   
                 46.6 
                 (R 3  + R 4 )/(R 3  − R 4 ) 
                 −4.63 
               
               
                   
                 SL/TTL 
                 0.98 
                 CT 2 /CT 3   
                 0.26 
               
               
                   
                 TTL/ImgH 
                 1.78 
                 CT 3 /ΣCT 
                 0.55 
               
               
                   
                 f/f 1   
                 1.06 
                 T 12 /CT 1   
                 1.105 
               
               
                   
                 |f 1 /f 2 | 
                 1.08 
                 CT 2 /f 
                 0.07 
               
               
                   
                 f/R 6   
                 −0.90 
               
               
                   
                   
               
             
          
         
       
     
       FIG. 4B  is a schematic view of longitudinal spherical aberration curves when the lights having a wavelength of 486.1 nm, 587.6 nm, and 656.3 nm are respectively projected in the optical lens assembly in  FIG. 4A . It can be observed from  FIG. 4B  that, when the different wavelengths, 486.1 nm, 587.6 nm, and 656.3 nm, of the light are received by the optical lens assembly  40 , the longitudinal spherical aberrations generated by the optical lens assembly  40  are within a range of −0.05 mm to 0.04 mm. 
       FIG. 4C  is a schematic view of astigmatic field curves when the light having the wavelength of 587.6 nm is projected in the optical lens assembly in  FIG. 4A . It can be observed from  FIG. 4C  that when the light having the wavelength of 587.6 nm is projected in the optical lens assembly  40 , the astigmatic field curvature of the tangential plane generated is within a range of −0.25 mm to 0.0 mm, and the astigmatic field curvature of the sagittal plane is within a range of −0.2 mm to 0.0 mm. 
       FIG. 4D  is a schematic view of a distortion curve when the light having the wavelength of 587.6 nm is projected in the optical lens assembly in  FIG. 4A . It can be observed from  FIG. 4D  that the distortion ratio generated when the light having the wavelength of 587.6 nm is projected in the optical lens assembly  40  is within a range of 1.5% to 0%. As shown in  FIGS. 4B to 4D , the optical lens assembly  40 , designed according to the fourth embodiment, is capable of effectively correcting various aberrations. 
     The Fifth Embodiment 
     Embodiment 5 
       FIG. 5A  is a schematic structural view of a fifth embodiment of the optical lens assembly according to the present disclosure. The specific implementation and elements of the fifth embodiment are substantially the same as those in the first embodiment. The element symbols in the fifth embodiment all begin with “5”, which correspond to those in the first embodiment with the same function or structure. For conciseness, only the differences are illustrated below, and the similarities will not be repeated herein. 
     In this embodiment, for example, the wavelength of the light received by the optical lens assembly  50  is 587.6 nm, but the wavelength may be adjusted according to actual requirements, and is not limited to the wavelength value mentioned above. 
     In this embodiment, a first lens element  510  with positive refractive power comprises a convex object-side surface  511 . A second lens element  520  with negative refractive power comprises a concave object-side surface  521 , a convex image-side surface  522 , and two inflection points  523  on the radial section of the second lens element  520  shown in  FIG. 5A . A third lens element  530  with positive refractive power comprises a convex object-side surface  531  and a convex image-side surface  532 . 
     The detailed data of the optical lens assembly  50  is as shown in Table 5-1 below. 
     
       
         
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 5-1 
               
             
             
               
                   
               
               
                 Embodiment 5 
               
               
                 f = 4.37 mm, Fno = 2.85, HFOV = 37.3 deg. 
               
             
          
           
               
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 length 
               
               
                   
               
             
          
           
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Ape. 
                 Plano 
                 −0.120 
               
               
                 2 
                 Lens 1 
                 1.921050 
                 0.695 
                 Plastic 
                 1.514 
                 56.8 
                 3.46 
               
               
                 3 
                   
                 −20.790000 
                 0.731 
               
               
                 4 
                 Lens 2 
                 −0.539530 
                 0.297 
                 Plastic 
                 1.634 
                 23.8 
                 −3.51 
               
               
                 5 
                   
                 −0.864710 
                 0.068 
               
               
                 6 
                 Lens 3 
                 2.829640 
                 1.780 
                 Plastic 
                 1.530 
                 55.8 
                 4.37 
               
               
                 7 
                   
                 −9.939900 
                 0.900 
               
               
                 8 
                 IR-filter 
                 Plano 
                 0.700 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 9 
                   
                 Plano 
                 0.874 
               
               
                 10 
                 Image 
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is d-line 587.6 nm 
               
             
          
         
       
     
     In Table 5-1, the first lens element  510 , the second lens element  520  and the third lens element  530  are made of plastic. The first lens element  510 , the second lens element  520 , and the third lens element  530  are aspheric, and the aspheric surfaces can satisfy Condition ASP, but are not limited thereto. As for the parameters of the aspheric surfaces, reference is made to Table 5-2 below. 
     
       
         
               
             
               
               
             
               
               
               
               
               
             
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 5-2 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 Surface# 
               
             
          
           
               
                   
                   
                 2 
                 3 
                 4 
               
               
                   
                   
               
               
                   
                 k 
                 −1.09327E+01 
                 1.81219E+02 
                 −1.21020E+00 
               
               
                   
                 A 4   
                 1.52203E−01 
                 −8.77749E−02 
                 8.90232E−02 
               
               
                   
                 A 6   
                 −1.94465E−01 
                 −2.14316E−01 
                 −5.17466E−02 
               
               
                   
                 A 8   
                 1.13389E−01 
                 2.16338E−01 
                 4.06331E−01 
               
               
                   
                 A 10   
                 −1.08349E−01 
                 −1.33652E−01 
                 −8.02296E−02 
               
               
                   
                 A 12   
                 1.35801E−03 
                 — 
                 −1.95188E−01 
               
               
                   
                   
               
             
          
           
               
                   
                 Surface# 
               
             
          
           
               
                   
                   
                 5 
                 6 
                 7 
               
               
                   
                   
               
               
                   
                 k 
                 −1.37297E+00 
                 −4.27901E+01 
                 6.65512E−01 
               
               
                   
                 A 4   
                 −4.89971E−02 
                 −1.57586E−02 
                 −1.42947E−02 
               
               
                   
                 A 6   
                 3.13834E−01 
                 5.05811E−03 
                 3.92202E−04 
               
               
                   
                 A 8   
                 −7.63431E−02 
                 −1.34203E−03 
                 7.55476E−05 
               
               
                   
                 A 10   
                 3.96914E−02 
                 3.19065E−04 
                 −4.41071E−05 
               
               
                   
                 A 12   
                 −3.63670E−02 
                 −3.42491E−05 
                 2.51814E−06 
               
               
                   
                   
               
             
          
         
       
     
     The content of Table 5-3 may be deduced from Table 5-1. 
     
       
         
               
             
               
               
               
               
               
             
           
               
                 TABLE 5-3 
               
               
                   
               
               
                 Embodiment 5 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 f (mm) 
                 4.37 
                 f 1 /R 2   
                 −0.17 
               
               
                   
                 Fno 
                 2.85 
                 R 3 /f 
                 −0.12 
               
               
                   
                 HFOV(deg.) 
                 37.3 
                 R 1 /R 2   
                 −0.09 
               
               
                   
                 V 1  − V 2   
                 33.0 
                 (R 3  + R 4 )/(R 3  − R 4 ) 
                 −4.32 
               
               
                   
                 SL/TTL 
                 0.98 
                 CT 2 /CT 3   
                 0.17 
               
               
                   
                 TTL/ImgH 
                 1.76 
                 CT 3 /ΣCT 
                 0.64 
               
               
                   
                 f/f 1   
                 1.26 
                 T 12 /CT 1   
                 1.05 
               
               
                   
                 |f 1 /f 2 | 
                 0.99 
                 CT 2 /f 
                 0.07 
               
               
                   
                 f/R 6   
                 −0.44 
               
               
                   
                   
               
             
          
         
       
     
       FIG. 5B  is a schematic view of longitudinal spherical aberration curves when the lights having wavelengths of 486.1 nm, 587.6 nm, and 656.3 nm are respectively projected in the optical lens assembly in  FIG. 5A . It can be observed from  FIG. 5B  that, when the different wavelengths, 486.1 nm, 587.6 nm, and 656.3 nm, of the light are received by the optical lens assembly  50 , the longitudinal spherical aberrations generated by the optical lens assembly  50  are within a range of −0.06 mm to 0.05 mm. 
       FIG. 5C  is a schematic view of astigmatic field curves when the light having the wavelength of 587.6 nm is projected in the optical lens assembly in  FIG. 5A . It can be observed from  FIG. 5C  that when the light having the wavelength of 587.6 nm is projected in the optical lens assembly  50 , the astigmatic field curvature of the tangential plane generated is within a range of −0.1 mm to 0.0 mm, and the astigmatic field curvature of the sagittal plane is within a range of −0.15 mm to 0.0 mm. 
       FIG. 5D  is a schematic view of a distortion curve when the light having the wavelength of 587.6 nm is projected in the optical lens assembly in  FIG. 5A . It can be observed from  FIG. 5D  that, the distortion ratio generated when the light having the wavelength of 587.6 nm is projected in the optical lens assembly  50  is within a range of −1.0% to 0%. As shown in  FIGS. 5B to 5D , the optical lens assembly  50 , designed according to the fourth embodiment, is capable of effectively correcting various aberrations.