Imaging lens, imaging device, and mobile terminal

Abstract

The present invention provides an image pickup lens, an image pickup apparatus, and a mobile terminal. The image pickup lens includes a lens group. The lens group includes a lens substrate which is a parallel flat plate, and lenses are formed on an object side surface and image side surface of the lens substrate, where a lens with a positive refractive power formed on the lens substrate has an Abbe number of νp and a lens with a negative refractive power formed on the lens substrate has an Abbe number of νn. The difference between the Abbe number νp and the Abbe number of νn satisfies 10<|νp−νn|.

1 .- 34 . (canceled) 
     
     
         35 . An image pickup lens comprising:
 a lens group arranged at a closest position to an object side in the image pickup lens, comprising:
 a first lens substrate being a parallel flat plate, 
 a first lens with an Abbe number ν 1  and a positive refractive power, formed on an object side surface of the first lens substrate, and 
 a second lens with an Abbe number ν 2  and a negative refractive power, formed on an image side surface of the first lens substrate, 
   wherein a difference of the Abbe numbers ν 1  and ν 2  satisfies the following expression (1):
   10<(ν1−ν2).  (1)
 
   
     
     
         36 . An image pickup lens of  claim 35  comprising of:
 a lens group comprising:
 a first lens substrate being a parallel flat plate, 
 a first lens with an Abbe number ν 1  and a positive refractive power, formed on an object side surface of the first lens substrate, an object side surface of the first lens being a convex surface facing the object side, and 
 a second lens with an Abbe number ν 2  and a negative refractive power, formed on an image side surface of the first lens substrate, an image side surface of the second lens being a concave surface facing the image side, 
 
 wherein a difference of the Abbe numbers ν 1  and ν 2  satisfies the following expression (2):
   10<(ν1−ν2)<70.  (2)
 
 
 
     
     
         37 . An image pickup lens of  claim 35  comprising:
 a lens group; and 
 a lens A arranged at an image side of the lens group with a predetermined distance, 
 wherein the lens group comprises:
 a first lens substrate being a parallel flat plate, 
 a first lens with an Abbe number ν 1  and a positive refractive power, formed on an object side surface of the first lens substrate, an object side surface of the first lens being a convex surface facing the object side, and 
 a second lens with an Abbe number ν 2  and a negative refractive power, formed on an image side surface of the first lens substrate, an image side surface of the second lens being an concave surface facing the image side, 
 
 the lens A is a lens or a lens group and has a positive or negative refractive power, and 
 a difference of the Abbe numbers ν 1  and ν 2  satisfies the following expression (2):
   10<(ν1−ν2)<70.  (2)
 
 
 
     
     
         38 . An image pickup lens of  claim 37  further comprising:
 a lens B arranged at an image side of the lens A with a predetermined distance, 
 wherein the lens B is a lens or a lens group and has a positive or negative refractive power. 
 
     
     
         39 . An image pickup lens of  claim 35  comprising:
 a lens group; and 
 an optical member being a parallel flat plate, arranged at an image side of the lens group with a predetermined distance, 
 wherein the lens group comprises:
 a first lens substrate being a parallel flat plate; 
 a first lens with an Abbe number ν 1  and a positive refractive power, formed on an object side surface of the first lens substrate, an object side surface of the first lens being a convex surface facing the object side; and 
 
 a second lens with an Abbe number ν 2  and a negative refractive power, formed on an image side surface of the first lens substrate, an image side surface of the second lens being a concave surface facing the image side, 
 a difference of the Abbe numbers ν 1  and ν 2  satisfies the following expression (2), and the optical member satisfies the following expression (6): 
 
       
         
           
             
               
                 
                   
                     
                       10 
                       < 
                       
                         ( 
                         
                           
                             v 
                              
                             
                                 
                             
                              
                             1 
                           
                           - 
                           
                             v 
                              
                             
                                 
                             
                              
                             2 
                           
                         
                         ) 
                       
                       < 
                       70 
                     
                     , 
                   
                 
                 
                   
                     ( 
                     2 
                     ) 
                   
                 
               
               
                 
                   
                     
                       
                         
                           D 
                           g 
                         
                         f 
                       
                       ≥ 
                       0.1 
                     
                     , 
                   
                 
                 
                   
                     ( 
                     6 
                     ) 
                   
                 
               
             
           
         
         where Dg is a thickness of the optical member, and f is a focal length of a total lens system of the image pickup lens. 
       
     
     
         40 . The image pickup lens of  claim 35 ,
 wherein the lens group satisfies the following expression (2):
   10<(ν1−ν2)<70.  (2)
 
   
     
     
         41 . The image pickup lens of  claim 35 , further comprising:
 a second lens substrate being a parallel flat plate, arranged at an image side of the first lens substrate with a predetermined distance, and a lens or lenses with a positive or negative power formed on at least one of an object side surface and an image side surface of the second lens substrate.   
     
     
         42 . The image pickup lens of  claim 41 , further comprising:
 a third lens substrate being a parallel flat plate, arranged at the image side of the second lens substrate with a predetermined distance, and a lens or lenses with a positive or negative power formed on at least one of an object side surface and an image side surface of the third lens substrate.   
     
     
         43 . The image pickup lens of  claim 35 , further comprising:
 an aperture stop formed on a surface of any one of a lens substrate or lens substrates in the image pickup lens.   
     
     
         44 . The image pickup lens of  claim 35 ,
 wherein each of the first lens and the second lens comprises a resin material, and   inorganic fine particles with a size of 30 nanometers or less are dispersed into the resin material.   
     
     
         45 . An image pickup apparatus comprising:
 an image pickup lens of  claim 35 ; and   an image sensor photoelectrically converting an object image formed by the image pickup lens.   
     
     
         46 . A mobile terminal comprising:
 an image pickup apparatus of  claim 45 .   
     
     
         47 . The image pickup lens of  claim 35 , wherein the first lens is arranged at a closest position to the object side of the image pickup lens.