Image lens array

• US 7,085,077 B1
• Filed: 10/11/2005
• Issued: 08/01/2006
• Est. Priority Date: 10/11/2005
• Status: Active Grant

• Current Assignee: Largan Precision Co Limited (Largan Precision)
• Original Assignee: Largan Precision Co Limited (Largan Precision)
• Inventors: Noda, Sayuri
• Primary Examiner(s): THOMPSON, TIMOTHY J
• Application Number:
  US11/247,913
• Time in Patent Office: 294 Days
• Field of Search: 359/784, 359/792, 359/689, 359/786, 359/780, 359/772, 359/686, 359/716, 359/776, 359/771
• US Class Current: 359/784
• CPC Class Codes: G02B 13/0035 having three lenses
• CPC Class Codes: G02B 9/12 having three components only

Abstract

An image lens array, from object side, comprises a first lens, an aperture, a second lens and a third lens. The first lens is a positive meniscus lens with a convex surface facing the object side; the second lens is positive meniscus lens with a convex surface facing the image side; the third lens is a positive meniscus lens with a convex surface facing the object side; and the first lens, the second lens and the third lens are made of the same plastic material, a focal length of the image lens array is f, a combined focal length of the first and second lenses is f12, a relation between the f and f12 can satisfy the equation: 1.0<f12/f<1.3.

Claims

1. An image lens array, from object side to image side, comprising a first lens, an aperture, a second lens and a third lens;

and wherein

the first lens is a positive meniscus lens with positive refractive power and has a convex surface facing the object side;

the aperture is located behind the first lens;

the second lens is positive meniscus lens with positive refractive power and has a convex surface facing the image side;

the third lens is a positive meniscus lens with positive refractive power and has a convex surface facing the object side;

and the first lens, the second lens and the third lens are made of the same plastic material, a focal length of the image lens array is f, a combined focal length of the first and second lenses is f12, a relation between the f and f12 can satisfy the equation;

1.0<

f12/f<

1.3;

the focal length of the image lens array is f, a focal length of the second lens is f2, and then f and f2 can satisfy the equation;

2.0<

f2<

f<

11.0;

the focal length of the image lens array is f, a focal length of the third lens is f3, and then f and f3 can satisfy the equation;

f3/f>

5.0.