US2021215908A1PendingUtilityA1

Three-piece compact optical lens system

59
Assignee: NEWMAX TECHNOLOGY CO LTDPriority: Jan 10, 2020Filed: Jan 10, 2020Published: Jul 15, 2021
Est. expiryJan 10, 2040(~13.5 yrs left)· nominal 20-yr term from priority
Inventors:Ching-Yun Huang
G02B 13/0035G02B 9/12
59
PatentIndex Score
0
Cited by
0
References
0
Claims

Abstract

A three-piece compact optical lens system includes, in order from the object side to the image side: a flat panel assembly, a first lens element; a stop; a second lens element; and a third lens element. Wherein a distance from an object to an image plane along the optical axis is OTL, a distance from an image-side surface of the flat panel to the image plane along the optical axis is PTL, an image height of the image plane is Y, an object height of a main light of the image height of the image plane which corresponds to the image-side surface of the flat panel is P, and they satisfy the relations: 2.5 mm<PTL<4.5 mm; 2.2<P/Y<7.0; 4 mm<OTL/Y<12 mm.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A three-piece compact optical lens system, in order from an object side to an image side, comprising:
 a flat panel made of glass;   a first lens element with a negative refractive power, at least one of an object-side surface and an image-side surface of the first lens element being aspheric;   a stop;   a second lens element with a positive refractive power, having an object-side surface being convex near an optical axis, at least one of the object-side surface and an image-side surface of the second lens element being aspheric; and   a third lens element with a refractive power, at least one of an object-side surface and an image-side surface of the third lens element being aspheric;   wherein the three-piece compact optical lens system has a total of three lens elements with refractive power, a distance from an object to an image plane along the optical axis is OTL, a distance from an image-side surface of the flat panel to the image plane along the optical axis is PTL, an image height of the image plane is Y, an object height of a main light of the image height of the image plane which corresponds to the image-side surface of the flat panel is P, and they satisfy the relations: 2.5 mm<PTL<4.5 mm; 2.2<P/Y<7.0; 4 mm<OTL/Y<12 mm.   
     
     
         2 . The three-piece compact optical lens system as claimed in  claim 1 , wherein a focal length of the three-piece compact optical lens system is f, a focal length of the first lens element is f1, and they satisfy the relation: −0.86<f/f1<−0.22. 
     
     
         3 . The three-piece compact optical lens system as claimed in  claim 1 , wherein a focal length of the three-piece compact optical lens system is f, a focal length of the second lens element is f2, and they satisfy the relation: 0.05<f/f2<1.27. 
     
     
         4 . The three-piece compact optical lens system as claimed in  claim 1 , wherein a focal length of the three-piece compact optical lens system is f, a focal length of the third lens element is f3, and they satisfy the relation: −0.17<f/f3<0.82. 
     
     
         5 . The three-piece compact optical lens system as claimed in  claim 1 , wherein a focal length of the three-piece compact optical lens system is f, a focal length of the second lens element and the third lens element combined is f23, and they satisfy the relation: 0.45<f/f23<1.04. 
     
     
         6 . The three-piece compact optical lens system as claimed in  claim 1 , wherein a focal length of the first lens element is f1, a focal length of the second lens element and the third lens element combined is f23, and they satisfy the relation: −3.07<f1/f23<−0.63. 
     
     
         7 . The three-piece compact optical lens system as claimed in  claim 1 , wherein a focal length of the first lens element is f1, a radius of curvature of the object-side surface of the first lens element is R1, and they satisfy the relation: −0.13<f1/R1<4.95. 
     
     
         8 . The three-piece compact optical lens system as claimed in  claim 1 , wherein a focal length of the first lens element is f1, a radius of curvature of the image-side surface of the first lens element is R2, and they satisfy the relation: −2.41<f1/R2<1.93. 
     
     
         9 . The three-piece compact optical lens system as claimed in  claim 1 , wherein a focal length of the second lens element is f2, a radius of curvature of the object-side surface of the second lens element is R3, and they satisfy the relation: 0.25<f2/R3<5.64. 
     
     
         10 . The three-piece compact optical lens system as claimed in  claim 1 , wherein a focal length of the second lens element is f2, a radius of curvature of the image-side surface of the second lens element is R4, and they satisfy the relation: −2.04<f2/R4<3.87. 
     
     
         11 . The three-piece compact optical lens system as claimed in  claim 1 , wherein a focal length of the third lens element is f3, a radius of curvature of the object-side surface of the third lens element is R5, and they satisfy the relation: −56.34<f3/R5<2.58. 
     
     
         12 . The three-piece compact optical lens system as claimed in  claim 1 , wherein a focal length of the third lens element is f3, a radius of curvature of the image-side surface of the third lens element is R6, and they satisfy the relation: −40.72<f3/R6<0.49. 
     
     
         13 . The three-piece compact optical lens system as claimed in  claim 1 , wherein a radius of curvature of the object-side surface of the first lens element is R1, a radius of curvature of the image-side surface of the first lens element is R2, and they satisfy the relation: −38.2<R1/R2<276.13. 
     
     
         14 . The three-piece compact optical lens system as claimed in  claim 1 , wherein a radius of curvature of the object-side surface of the second lens element is R3, a radius of curvature of the image-side surface of the second lens element is R4, and they satisfy the relation: −5.91<R3/R4<0.82. 
     
     
         15 . The three-piece compact optical lens system as claimed in  claim 1 , wherein a radius of curvature of the object-side surface of the third lens element is R5, a radius of curvature of the image-side surface of the third lens element is R6, and they satisfy the relation: −2.86<R5/R6<22.19. 
     
     
         16 . The three-piece compact optical lens system as claimed in  claim 1 , wherein a focal length of the three-piece compact optical lens system is f, the distance from the object to the image plane along the optical axis is OTL, and they satisfy the relation: 7.71<OTL/f<17.62. 
     
     
         17 . The three-piece compact optical lens system as claimed in  claim 1 , wherein a focal length of the first lens element is f1, a focal length of the second lens element is f2, a focal length of the third lens element is f3, and they satisfy the relation: −4.56<(f1+f2+f3)/(f1*f2*f3)<−0.53. 
     
     
         18 . The three-piece compact optical lens system as claimed in  claim 1 , wherein the object-side surface of the first lens element is concave near the optical axis. 
     
     
         19 . The three-piece compact optical lens system as claimed in  claim 1 , wherein the image-side surface of the second lens element is convex near the optical axis. 
     
     
         20 . The three-piece compact optical lens system as claimed in  claim 1 , wherein the image-side surface of the third lens element is convex near the optical axis.

Cited by (0)

No later patents cite this yet.

References (0)

No backward citations on record.