Abstract: A microscope objective lens includes a first lens group, a second lens group, and a third lens group. The first lens group includes a positive lens component having a lens surface positioned nearest to the object side and having a negative refractive power. The second lens group includes a diffractive optical element that joins two diffractive element components respectively made from different optical materials and which has a diffractive optical surface on which diffractive grating grooves are formed on the bonded surface of the two diffractive element components. The third lens group includes at least one achromatic lens component having a negative refractive power, and a lens surface of the third lens group nearest to the image side is arranged so that a concave surface of the lens surface faces the image side.

Abstract: A microscope objective lens includes a first lens group, a second lens group, and a third lens group. The first lens group includes a positive lens component having a lens surface positioned nearest the object side and having a negative refractive power and at least one cemented lens component having a combined positive refractive power. The second lens group includes a diffractive optical element that joins two diffractive element components made from different optical materials and has a diffractive optical surface on which diffractive grating grooves are formed on the bonded surface of the two diffractive element components, and at least one cemented lens component. The third lens group includes at least one achromatic lens component having a combined negative refractive power, and a lens surface of the third lens group nearest the image side is arranged so that a concave surface of the lens surface faces the image side.

Abstract: A microscope objective lens includes a first lens group, a second lens group, and a third lens group. The first lens group includes a positive lens component having a lens surface positioned nearest the object side and having a negative refractive power and at least one cemented lens component having a combined positive refractive power. The second lens group includes a diffractive optical element that joins two diffractive element components made from different optical materials and has a diffractive optical surface on which diffractive grating grooves are formed on the bonded surface of the two diffractive element components, and at least one cemented lens component. The third lens group includes at least one achromatic lens component having a combined negative refractive power, and a lens surface of the third lens group nearest the image side is arranged so that a concave surface of the lens surface faces the image side.

Abstract: A microscope objective lens includes a first lens group, a second lens group, and a third lens group. The first lens group includes a positive lens component having a lens surface positioned nearest to the object side and having a negative refractive power. The second lens group includes a diffractive optical element that joins two diffractive element components respectively made from different optical materials and which has a diffractive optical surface on which diffractive grating grooves are formed on the bonded surface of the two diffractive element components. The third lens group includes at least one achromatic lens component having a negative refractive power, and a lens surface of the third lens group nearest to the image side is arranged so that a concave surface of the lens surface faces the image side.

Abstract: A microscope objective lens OL includes, in order from the object side: a first lens group G1 having a positive refractive power, a second lens group G2, and a third lens group G3 having a negative refractive power, wherein the first lens group G1 includes a positive lens component L1 having a lens surface with a negative refractive power and at least one cemented lens component CL11 having a positive refractive power, the second lens group G2 includes a diffractive optical element GD that joins two diffractive element components L6 and L7 respectively made from different optical materials and which has a diffractive optical surface D on which diffractive grating grooves are formed on the bonded surface of the two diffractive element components, and at least one cemented lens component CL21, and the third lens group G3 includes at least one achromatic lens component CL31.

Abstract: A microscope objective lens OL comprises, in order from the object side: a first lens group G1 having a positive refractive power, a second lens group G2, and a third lens group G3 having a negative refractive power, wherein the first lens group G1 includes a positive lens component L1 having a lens surface with a negative refractive power and at least one cemented lens component CL11 having a positive refractive power, the second lens group G2 includes a diffractive optical element GD that joins two diffractive element components L6 and L7 respectively made from different optical materials and which has a diffractive optical surface D on which diffractive grating grooves are formed on the bonded surface of the two diffractive element components, and at least one cemented lens component CL21, and the third lens group G3 includes at least one achromatic lens component CL31 and a lens surface of the third lens group G3 nearest to the image side is arranged so that a concave surface of the lens surface faces the