Patent ID: 11867884
Assignee: LARGAN PRECISION CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 10:
11. A photographing optical lens assembly comprising six lens elements, the six lens elements being, in order from an object side to an image side:
a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element; each of the six lens elements has an object-side surface towards the object side and an image-side surface towards the image side;
wherein the first lens element has positive refractive power; the second lens element has negative refractive power, the image-side surface of the second lens element is concave in a paraxial region thereof; the image-side surface of the sixth lens element is convex in a paraxial region thereof; at least one of the six lens elements comprises at least one inflection point;
wherein an axial distance between the second lens element and the third lens element is larger than a central thickness of the sixth lens element; a central thickness of the first lens element is a maximum among central thicknesses of the six lens elements;
wherein an axial distance between the object-side surface of the first lens element and the image-side surface of the sixth lens element is TD, a focal length of the photographing optical lens assembly is f, a refractive index of the first lens element is N1, a refractive index of the second lens element is N2, a refractive index of the third lens element is N3, a refractive index of the fourth lens element is N4, a refractive index of the fifth lens element is N5, a refractive index of the sixth lens element is N6, a maximum of N1, N2, N3, N4, N5 and N6 is Nmax, a half of a maximal field of view of the photographing optical lens assembly is HFOV, and the following conditions are satisfied:, 0.3
   <
   
    TD
    /
    f
   
   <
   
    0
    .90
   
  
  ;
 

 
  
   
    N
    ⁢
    max
   
   <
   1.7
  
  ;
  and
 

 
  
   7.5
      
   degrees
  
  <
  HFOV
  <
  
   23.5
      
   
    degrees
    .