Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
277 words
A planapochromatic objective lens system for use in microscopes, which is constructed as two groups and six lenses and in which a first group of lenses comprises a first negative meniscus lens that has at its object side a concave surface, and a second positive lens slightly air spaced from said first meniscus lens, and a second group of lenses is separated from said first group of lenses by a long air space and comprises a compound lens including third, fourth and fifth lenses, the fourth lens sandwiched Between the third and fifth lenses being made of fluorspar, and a sixth positive lens having a significantly large dispersive power, and which is defined by the following five conditions, i.e., 1. Nu > 45 for all lenses except the first lens, 2. Nu 6 > OR = 70, 3. 30 > Nu 5 - Nu 3 > 10, 4. d1 > r1 + r2 /2, and 5. r5 < 0 where Nu is the dispersive powers of all of the lenses, Nu 3, Nu 5 and Nu 6 are the dispersive powers of the third, fifth and sixth lenses, respectively, d1 is the axial thickness of the first lens, and r1, r2 and r5 are the radii of curvatures of the front and rear surfaces of the first lens and of the front surface of the third lens, respectively, wherein the radii of curvatures r1 to r10 , the air spaces or axial thicknesses d1 to d9, refractive indexes n1 to n11, and dispersive powers Nu 1 to Nu 6 of the six lenses as counted in succession from the object side are defined by the folowing values,
Claim 2
Dependent Claim
277 words
A planapochromatic objective lens system for use in microscopes, which is constructed as two groups and six lenses and in which a first group of lenses comprises a first negative meniscus lens that has at its object side a concave surface, and a second positive lens slightly air spaced from said first meniscus lens, and a second group of lenses is separated from said first group of lenses by a long air space and comprises a compound lens including third, fourth and fifth lenses, the fourth lens sandwiched Between the third and fifth lenses being made of fluorspar, and a sixth positive lens having a significantly large dispersive power, and which is defined by the following five conditions, i.e., 1. Nu > 45 for all lenses except the first lens, 2. Nu 6 > OR = 70, 3. 30 > Nu 5 - Nu 3 > 10, 4. d1 > r1 + r2 /2, and 5. r5 < 0 where Nu is the dispersive powers of all of the lenses, Nu 3, Nu 5 and Nu 6 are the dispersive powers of the third, fifth and sixth lenses, respectively, d1 is the axial thickness of the first lens, and r1, r2 and r5 are the radii of curvatures of the front and rear surfaces of the first lens and of the front surface of the third lens, respectively, wherein the radii of curvatures r1 to r10 , the air spaces or axial thicknesses d1 to d9, refractive indexes n1 to n11, and dispersive powers Nu 1 to Nu 6 of the six lenses as counted in succession from the object side are defined by the folowing values,
Claim 3
Dependent Claim
6 words
Nu 6 > or = 70,
Claim 4
Dependent Claim
6 words
Nu 6 > or = 70,
Claim 5
Dependent Claim
9 words
30 > Nu 5 - Nu 3 > 10,
Claim 6
Dependent Claim
9 words
30 > Nu 5 - Nu 3 > 10,
Claim 7
Dependent Claim
7 words
d1 > r1 + r2 /2, and
Claim 8
Dependent Claim
7 words
d1 > r1 + r2 /2, and
Claim 9
Dependent Claim
121 words
r5 < 0 where Nu is the dispersive powers of all of the lenses, Nu 3, Nu 5 and Nu 6 are the dispersive powers of the third, fifth and sixth lenses, respectively, d1 is the axial thickness of the first lens, and r1, r2 and r5 are the radii of curvatures of the front and rear surfaces of the first lens and of the front surface of the third lens, respectively, wherein the radii of curvatures r1 to r10 , the air spaces or axial thicknesses d1 to d9, refractive indexes n1 to n11, and dispersive powers Nu 1 to Nu 6 of the six lenses as counted in succession from the object side are defined by the folowing values,
Claim 10
Dependent Claim
121 words
r5 < 0 where Nu is the dispersive powers of all of the lenses, Nu 3, Nu 5 and Nu 6 are the dispersive powers of the third, fifth and sixth lenses, respectively, d1 is the axial thickness of the first lens, and r1, r2 and r5 are the radii of curvatures of the front and rear surfaces of the first lens and of the front surface of the third lens, respectively, wherein the radii of curvatures r1 to r10 , the air spaces or axial thicknesses d1 to d9, refractive indexes n1 to n11, and dispersive powers Nu 1 to Nu 6 of the six lenses as counted in succession from the object side are defined by the folowing values,