Liquid immersion lens system and optical apparatus using the same
AssigneeOlympus Optical Co., Ltd.
InventorHitoshi Hatano
Life of this patent
Estimating the term…
Abstract
A low magnification liquid immersion objective lens system uses an immersion liquid having a refractive index for the d-line within a range defined by a condition (1) shown below, and has a magnification β and a working distance WDL which satisfy the following conditions (2) and (3): 1.34≦ND≦1.80 (1) β≦15 (2) WDL≦0.35 mm. (3)
Claims6
A low magnification liquid immersion objective lens system which uses an immersion liquid having a refractive index ND within a range defined by a condition (1) shown below, comprising in order from the object side, a first lens unit having positive refractive power and at least another lens unit, and satisfying the following conditions (2), (3) and (4):
- 1.34≦ND≦1.80 (1)
- β≦15 (2)
- WDL≦0.35 mm (3)
- |f·β/fG1|≦40 (4)
- wherein a reference symbol β represents a magnification of said objective lens system, a reference symbol WDL designates a working distance of said objective lens system, a reference symbol fG1 represents a focal length of the first lens unit and a reference symbol f designates a focal length of said objective lens system.
A low magnification liquid immersion objective lens system which uses an immersion liquid having a refractive index ND within a range defined by a condition (1) shown below, comprising in order from the object side, a first lens unit having positive refractive power;
- a second lens unit having negative refractive power;
- and a third lens unit having positive refractive power, and satisfying the following conditions (2), (3) and (4):
- 1.34≦ND≦1.80 (1)
- β≦15 (2)
- WDL≦0.35 mm (3)
- |fG3/f|≦5 (4)
- wherein a reference symbol β represents a magnification of said objective lens system, a reference symbol WDL designates a working distance of said objective lens system, a reference symbol fG3 represents a focal length of the third lens unit and a reference symbol f designates a focal length of said objective lens system.
A low magnification liquid immersion objective lens system which uses an immersion liquid having a refractive index ND within a range defined by a condition (1) shown below, comprising in order from the object side, a first lens unit having positive refractive power;
- and a second lens unit having negative refractive power, and satisfying the following conditions (2), (3) and (4):
- 1.34≦ND≦1.80 (1)
- β≦15 (2)
- WDL≦0.35 mm (3)
- |f·β/fG1|≦20 (4)
- wherein a reference symbol β represents a magnification of said objective lens system, a reference symbol WDL designates a working distance of said objective lens system, a reference symbol fG1 represents a focal length of the first lens unit, and a reference symbol f designates a focal length of said objective lens system.
Dependencies are inferred from the claim text.