US5978147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Immersion microscope objective
Assignee: Nikon Corp
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Filing: 1998-08-14
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Granted: 1999-11-02
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Expires: 2018-08-14
Abstract
Abstract A high-magnification immersion microscope objective 10 capable of being fabricated relatively easily, and wherein field flatness is well-corrected and the image quality is good even at the periphery of the field. The microscope objective comprises, objectwise to imagewise, a first lens group G1 having positive refractive power, a second lens group G2 having positive refractive power, and third lens group G3 having negative refractive power. First lens group includes four single positive lenses (L11 to L14), and second lens group G2 has a plurality of cemented lenses (L21 and L22). The microscope objective preferably satisfies at least one of a number of design conditions.
Inventors
- 👤 Shintaro Kudo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:51
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/33; G02B21/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
53 words
An immersion microscope objective capable of imaging an object, comprising, objectwise to imagewise: a) a first lens group having positive refractive power and four single positive lens elements; b) a second lens group having positive refractive power and a plurality of cemented lenses; and c) a third lens group having negative refractive power.
Claim 2
Dependent Claim
53 words
An immersion microscope objective capable of imaging an object, comprising, objectwise to imagewise: a) a first lens group having positive refractive power and four single positive lens elements; b) a second lens group having positive refractive power and a plurality of cemented lenses; and c) a third lens group having negative refractive power.
Claim 3
Dependent Claim
29 words
An immersion microscope objective according to claim 1, wherein said second lens group includes a triplet cemented lens comprising a positive lens, a negative lens and a positive lens.
Claim 4
Dependent Claim
38 words
An immersion microscope objective according to claim 1 satisfying the following condition: 1.2<f 1 /f<3.5 wherein f 1 is the focal length of said first lens group, and f is the overall focal length of the microscope objective.
Claim 5
Dependent Claim
28 words
An immersion microscope objective according to claim 3, satisfying the following condition: 5<|f 3 |/f<25 wherein f 3 is the focal length of said third lens group G3.
Claim 6
Dependent Claim
29 words
An immersion microscope objective according to claim 4 wherein said positive lens elements in said first lens group each have an Abbe number equal to or greater than 50.
Claim 7
Dependent Claim
34 words
An immersion microscope objective according to claim 5, wherein said first lens group includes a most objectwise lens having a focal length f 11 , and the following condition is satisfied: 1.0<f 11 /f<3.5.
Claim 8
Dependent Claim
138 words
An immersion microscope objective having an overall focal length f and capable of imaging an object, comprising, objectwise to imagewise: a) a first lens group having positive refractive power and a focal length f 1 , and including four single positive lens elements having Abbe numbers ν 1 , ν 2 , ν 3 , and ν 4 , respectively, wherein one of said positive lens elements is disposed most objectwise and has a focal length f 11 ; b) a second lens group having positive refractive power and a plurality of cemented lenses; c) a third lens group having negative refractive power and a focal length f 3 ; and d) wherein at least one of the following design conditions is satisfied: 1.2<f 1 /f<3.5 5<|f 3 |f<25 ν 1 through ν 4 ≧50 1.0<f 11 /f<3.5.
Claim 9
Dependent Claim
138 words
An immersion microscope objective having an overall focal length f and capable of imaging an object, comprising, objectwise to imagewise: a) a first lens group having positive refractive power and a focal length f 1 , and including four single positive lens elements having Abbe numbers ν 1 , ν 2 , ν 3 , and ν 4 , respectively, wherein one of said positive lens elements is disposed most objectwise and has a focal length f 11 ; b) a second lens group having positive refractive power and a plurality of cemented lenses; c) a third lens group having negative refractive power and a focal length f 3 ; and d) wherein at least one of the following design conditions is satisfied: 1.2<f 1 /f<3.5 5<|f 3 |f<25 ν 1 through ν 4 ≧50 1.0<f 11 /f<3.5.
Claim 10
Dependent Claim
29 words
An immersion microscope objective according to claim 7, wherein said second lens group includes a triplet cemented lens comprising a positive lens, a negative lens and a positive lens.
References Cited (Backward Citations)
US5636058A
Cited
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