Patent ID: 7262922
Filing Date: 2007-08-28
Classification: G02B

Abstract:
1. An immersion microscope objective lens comprising, in the following order from an object side to an image side: a first lens group having positive refractive power as a whole, including, in the following order from the object side to the image side, a first lens component comprising a first meniscus lens and a second meniscus lens cemented to each other with their concave surfaces facing the object side, with the first meniscus lens having a surface disposed to contact an immersion liquid, a second lens component comprising a single lens having positive refractive power and a third lens component comprising a negative lens and a positive lens cemented to each other; a second lens group having positive refractive power as a whole, including a fourth lens component comprising a negative lens and a positive lens cemented to each other; and a third lens group having negative refractive power as a whole, wherein the following conditions are satisfied: where r