Objective lens system for use within microscope

Claim 2

An objective lens system for a microscope, comprising: a first lens made of quartz, said first lens having a negative power; a second lens made of either quartz or fluorite, said second lens having a positive power; a third lens made of quartz, said third lens having a negative power; a fourth lens made of fluorite, said fourth lens having a positive power; a fifth lens made of quartz, said fifth lens having a negative power; and a sixth lens made of fluorite, said sixth lens having a positive power, wherein said first to said sixth lenses are disposed in that order from an object side to an image formation side with predetermined air spacings therebetween.

Claim 3

An objective lens system according to claim 1, wherein the following inequalities are satisfied: |φ.sub.2 /φ.sub.1 |<0.92 1.1<|φ.sub.4 /φ.sub.3 |<8.8 |φ.sub.6 /φ.sub.5 |<0.85 where said powers of said first, said second, said third, said fourth, said fifth and said sixth lenses are φ 1 , φ 2 , φ 3 , φ 4 , φ 5 and φ 6 , respectively.

Claim 4

An objective lens system for a microscope, the objective lense system being interchangeable with another objective lens system for forming an image at a predetermined image magnification in cooperation with an image formation lens system, the objective lens system being able to provide roughly double image magnification when the same cooperates with said image formation lens system in place of said another objective lens system, said objective lens system comprising: a first lens made of quartz, said first lens having a negative power; a second lens made of either quartz or fluorite, said second lens having a positive power; a third lens made of quartz, said third lens having a negative power; a fourth lens made of fluorite, said fourth lens having a positive power; a fifth lens made of quartz, said fifth lens having a negative power; and a sixth lens made of fluorite, said sixth lens having a positive power, wherein said first to said sixth lenses are disposed in that order from an object side to an image formation side with predetermined air spacing therebetween, and wherein the following inequalities are satisfied: |φ.sub.2 /φ.sub.1 |<0.92 1.1<|φ.sub.4 /φ.sub.3 |<8.8 |φ.sub.6 /φ.sub.5 |<0.85 wherein said powers of said first, said second, said third, said fourth, said fifth and said sixth lenses are φ 1 , φ 2 , φ 3 , φ 4 , φ 5 , and φ 6 , respectively.

Claim 5

An objective lens system for a microscope, the objective lense system being interchangeable with another objective lens system for forming an image at a predetermined image magnification in cooperation with an image formation lens system, the objective lens system being able to provide roughly double image magnification when the same cooperates with said image formation lens system in place of said another objective lens system, said objective lens system comprising: a first lens made of quartz, said first lens having a negative power; a second lens made of either quartz or fluorite, said second lens having a positive power; a third lens made of quartz, said third lens having a negative power; a fourth lens made of fluorite, said fourth lens having a positive power; a fifth lens made of quartz, said fifth lens having a negative power; and a sixth lens made of fluorite, said sixth lens having a positive power, wherein said first to said sixth lenses are disposed in that order from an object side to an image formation side with predetermined air spacing therebetween, and wherein the following inequalities are satisfied: |φ.sub.2 /φ.sub.1 |<0.92 1.1<|φ.sub.4 /φ.sub.3 |<8.8 |φ.sub.6 /φ.sub.5 |<0.85 wherein said powers of said first, said second, said third, said fourth, said fifth and said sixth lenses are φ 1 , φ 2 , φ 3 , φ 4 , φ 5 , and φ 6 , respectively.

Claim 6

An objective lens system for a microscope, comprising: a first meniscus lens made of either quartz or fluorite, said first lens having a concave surface directed toward an object; a second meniscus lens made of quartz, said second lens having a convex surface directed toward said object, said second lens having a negative power; a third and a fifth lens made of fluorite, said third and said fifth lens having a positive power; and a fourth lens made of quartz, said fourth lens having a negative power, wherein said first to said fifth lenses are disposed in that order from an object side to an image formation side with predetermined air spacings therebetween.

Claim 7

An objective lens system for a microscope, comprising: a first meniscus lens made of either quartz or fluorite, said first lens having a concave surface directed toward an object; a second meniscus lens made of quartz, said second lens having a convex surface directed toward said object, said second lens having a negative power; a third and a fifth lens made of fluorite, said third and said fifth lens having a positive power; and a fourth lens made of quartz, said fourth lens having a negative power, wherein said first to said fifth lenses are disposed in that order from an object side to an image formation side with predetermined air spacings therebetween.

Claim 8

An objective lens system for a microscope according to claim 4, wherein said first lens has a negative power.

Claim 9

An objective lens system for a microscope according to claim 4, wherein the following inequalities are satisfied: 2.1<|φ.sub.3 /φ.sub.2 |<2.7 0.35<|φ.sub.5 /φ.sub.4 |<0.45 1.85<|φ.sub.23 /φ|<2.25 0.63<|φ.sub.45 /φ|<0.69 where the powers of said second lens, said third lens, said fourth lens and said fifth lens are φ 2 , φ 3 , φ 4 and φ 5 , the power of a composite lenses system consisting of said second and said third lenses is φ 23 , the power of a composite lens system consisting of said fourth and said fifth lenses is φ 45 , and a power of the objective lens system is φ.

Claim 10

An objective lens system for a microscope, said objective lens system being interchangeable with another objective lens system for forming an image at a predetermined imaging magnification in cooperation with an image formation lens system, said objective lens system being able to provide roughly double image magnification when the same cooperates with said image formation lens system in place of said another objective lens system, said objective lens system comprising: a first meniscus lens made of either quartz or fluorite, said first lens having a concave surface directed toward an object; a second meniscus lens made of quartz, said second lens having a convex surface directed toward said object, said second lens having a negative power; a third and a fifth lens made of fluorite, said third and said fifth lens having a positive power; and a fourth lens made of quartz, said fourth lens having a negative power; wherein said first to said fifth lenses are disposed in that order from an object side to an image formation side with predetermined air spacings therebetween, and wherein the following inequalities are satisfied: 2.1<|φ.sub.3 /φ.sub.2 |<2.7 0.35<|φ.sub.5 /φ.sub.4 |<0.45 1.85<|φ.sub.23 /φ|<2.25 0.63<|φ.sub.45 /φ|<0.69 where the powers of said second, said third, said fourth and said fifth lenses are respectively φ 2 , φ 3 , φ 4 and φ 5 , the power of a composite lens system consisting of said second and said third lenses is φ 23 , the power of a composite lens system consisting of said fourth and said fifth lenses is φ 45 , and the power of the objective lens system is φ.

Claim 11

An objective lens system for a microscope, said objective lens system being interchangeable with another objective lens system for forming an image at a predetermined imaging magnification in cooperation with an image formation lens system, said objective lens system being able to provide roughly double image magnification when the same cooperates with said image formation lens system in place of said another objective lens system, said objective lens system comprising: a first meniscus lens made of either quartz or fluorite, said first lens having a concave surface directed toward an object; a second meniscus lens made of quartz, said second lens having a convex surface directed toward said object, said second lens having a negative power; a third and a fifth lens made of fluorite, said third and said fifth lens having a positive power; and a fourth lens made of quartz, said fourth lens having a negative power; wherein said first to said fifth lenses are disposed in that order from an object side to an image formation side with predetermined air spacings therebetween, and wherein the following inequalities are satisfied: 2.1<|φ.sub.3 /φ.sub.2 |<2.7 0.35<|φ.sub.5 /φ.sub.4 |<0.45 1.85<|φ.sub.23 /φ|<2.25 0.63<|φ.sub.45 /φ|<0.69 where the powers of said second, said third, said fourth and said fifth lenses are respectively φ 2 , φ 3 , φ 4 and φ 5 , the power of a composite lens system consisting of said second and said third lenses is φ 23 , the power of a composite lens system consisting of said fourth and said fifth lenses is φ 45 , and the power of the objective lens system is φ.