Patent ID: 6671105
Filing Date: 2003-12-30
Classification: G02B

Abstract:
An image pickup lens system comprising a lens of a meniscus shape having a first face as a convex face located on the object side, and a diaphragm disposed at the object side of the lens, said lens meeting the following conditions:Yâ€²/fl&gE;0.6â€ƒâ€ƒ(1) 0.9&gE;Dt/Dc&gE;0.5â€ƒâ€ƒ(2) 1.0&gE;Ap2/Am2&gE;0.9â€ƒâ€ƒ(3) wherein fl is a focal length of the entire lens system;Yâ€² is a maximum image height; Dt is a thickness of a thinnest portion of the lens in an area including at least one optical face; Dc is a thickness of a central portion of the lens; Ap2 is an effective radius of a second face of the lens on the side of the image surface (a maximum radius of a portion through which effective light rays pass); and Am2 is a maximum radius of the second face on the side of the image surface.