Patent ID: 6809878
Filing Date: 2004-10-26
Classification: G02B

Abstract:
A zoom lens comprising, from an object side to an image plane side:a first lens group having negative overall refractive power, a second lens group having positive overall refractive power, and a third lens group having positive overall refractive power, wherein: said first lens group comprises a first lens and a second lens bonded together and having a negative refractive power; said second lens group comprises a third lens with a positive refractive power, and a fourth lens and a fifth lens bonded together and having a negative refractive power; and said third lens group comprises a sixth lens having a positive refractive power, wherein said third lens satisfies: (1)R5>|R6|where R5 is an object-side curvature radius of said third lens and R6 is an image-plane-side curvature radius of said third lens.