| 摘要 |
PROBLEM TO BE SOLVED: To provide an imaging lens which can sufficiently meet the demands for further reduction in size and weight and for further improvement of the optical performance, and is also capable of improving the productivity. SOLUTION: The imaging lens comprises, from the object side, a diaphragm 2, a first lens 3 as a positive meniscus lens whose convex surface faces the object side, and a second lens 4 as a positive lens whose convex surface faces the image surface side, wherein following expressions are to be satisfied 1.25≥L/f1≥0.8, 1≥f<SB>1</SB>/f<SB>2</SB>>0.55, 1.8≥f<SB>1</SB>/fl≥1, 4≥f<SB>2</SB>/fl≥1.5, 1≥d<SB>2</SB>/d<SB>1</SB>≥0.5, 0.27≥d<SB>1</SB>/fl≥0.1 and 0.27≥d<SB>3</SB>/fl≥0.1 (where L: entire length of the lens system, fl: focal distance of the entire lens system, f<SB>1</SB>: focal distance of the first lens, f<SB>2</SB>: focal distance of the second lens, d<SB>1</SB>: center thickness of the first lens, d<SB>2</SB>: distance between the first lens and the second lens on the optical axis, d<SB>3</SB>: center thickness of the second lens). COPYRIGHT: (C)2007,JPO&INPIT
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