Digital camera imaging lens
A digital camera imaging lens includes first, second and third lenses arranged in sequence from an object side toward an imaging surface side. The first lens is a meniscus lens having a positive power, whose convex surface faces the object side. The second lens is a meniscus lens having a negative power, whose concave surface faces the object side. The third lens is an aspherical lens having an inflection point on its object-side surface. An aperture stop is disposed between the first and second lenses. The imaging surface is defined by an element surface of a photosensor.
1. A digital camera imaging lens comprising a first lens, a second lens, and a third lens arranged in sequence from an object side toward an imaging surface side; wherein
the first lens is a meniscus lens having a positive power, whose convex surface faces the object side;
the second lens is a meniscus lens having a negative power, whose concave surface faces the object side;
the third lens is an aspherical lens having an inflection point on its object-side surface;
an aperture stop is disposed between the first and second lenses; and
the imaging surface is defined by an element surface of a photosensor.
2. A digital camera imaging lens according to claim 1 , wherein
the first lens has at least one lens surface thereof which is aspherical, and wherein
the following condition is satisfied when a total focal distance of the digital camera imaging lens is f, and a focal distance of the first lens is f 1 :
0.5< f 1 /f< 1.5.
3. The digital camera imaging lens according to claim 2 , wherein
the third lens has a peripheral portion of its lens surface on the imaging surface side, the peripheral portion being convex towards the imaging surface side; and
a maximum exit angle of a principal ray in the digital camera imaging lens is 30 degrees or less.
4. The digital camera imaging lens according to claim 1 , wherein
the third lens has a peripheral portion of its lens surface on the imaging surface side, the peripheral portion being convex towards the imaging surface side; and
a maximum exit angle of a principal ray in the digital camera imaging lens is 30 degrees or less.
5. A digital camera imaging lens comprising a first lens, a second lens, and a third lens arranged in sequence from an object side toward an imaging surface side; wherein
the first lens is a meniscus lens having a positive power, whose convex surface faces the object side;
the second lens is a meniscus lens having a negative power, whose concave surface faces the object side;
the third lens is an aspherical lens having at least one inflection point; and
the imaging surface is defined by an element surface of a photosensor.
6. A digital camera imaging lens according to claim 5 , wherein
the first lens has at least one lens surface thereof which is aspherical, and wherein
the following condition is satisfied when a total focal distance of the digital camera imaging lens is f, and a focal distance of the first lens is f 1 :
0.5 <f 1 /f< 1.5.
7. The digital camera imaging lens according to claim 5 , wherein
the following condition is satisfied when a total focal distance of the digital camera imaging lens is f, and a distance from an incident surface of the first lens on the object side to the imaging surface is Σd:
0.5 <Σd/f< 1.5.
8. A digital camera imaging lens according to claim 5 , wherein
the following condition is satisfied when an Abbe number of the second lens is νd 2 :
50 >νd 2.