US5059005A
Expired / Lapsed
US
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Objective lens system for microscopes
Assignee: Olympus Corp
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Filing: 1990-08-23
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Granted: 1991-10-22
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Expires: 2010-08-23
Abstract
Abstract An objective lens system for microscopes comprising a plurality of lens units including a first lens unit arranged at the foremost location and having a positive refractive power, and using a GRIN lens or GRIN lenses designed taking into consideration the characteristic of the glass materials currently available. The objective lens system for microscopes consists of a small number of lens elements and has favorably corrected aberrations.
Inventors
- 👤 Yoshihiro Kawano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:02
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/02
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
108 words
An objective lens system for microscopes comprising a plurality of lens units including a first lens unit arranged at the foremost location and having a positive refractive power, and using at least one radial GRIN lens satisfying the following condition (1): 0<v.sub.1d ( 1) wherein the reference symbol v 1d =N 1d /(N 1F -N 1C ), N 1d , N 1F and N 1C being the coefficients of the second order of the refractive index distribution formula for the d-line, F-line and C-line respectively shown below: n.sub.d (r)=N.sub.0d +N.sub.1d r.sup.2 +N.sub.2d r.sup.4 + n.sub.C (r)=N.sub.0C +N.sub.1C r.sup.2 +N.sub.2C r.sup.4 + n.sub.F (r)=N.sub.0F +N.sub.1F r.sup.2 +N.sub.2F r.sup.4 +
Claim 2
Dependent Claim
108 words
An objective lens system for microscopes comprising a plurality of lens units including a first lens unit arranged at the foremost location and having a positive refractive power, and using at least one radial GRIN lens satisfying the following condition (1): 0<v.sub.1d ( 1) wherein the reference symbol v 1d =N 1d /(N 1F -N 1C ), N 1d , N 1F and N 1C being the coefficients of the second order of the refractive index distribution formula for the d-line, F-line and C-line respectively shown below: n.sub.d (r)=N.sub.0d +N.sub.1d r.sup.2 +N.sub.2d r.sup.4 + n.sub.C (r)=N.sub.0C +N.sub.1C r.sup.2 +N.sub.2C r.sup.4 + n.sub.F (r)=N.sub.0F +N.sub.1F r.sup.2 +N.sub.2F r.sup.4 +
Claim 3
Dependent Claim
18 words
An objective lens system for microscopes according to claim 1 satisfying the following condition (2): v.sub.1d ≦100 (2)
Claim 4
Dependent Claim
22 words
An objective lens system for microscopes according to claim 1 or 2 comprising a radial GRIN lens in said first lens unit.
Claim 5
Dependent Claim
40 words
An objective lens system for microscopes according to claim 3 wherein said GRIN lens has a shape thicker at the marginal portion than at the central portion thereof, a positive refractive power of medium and a positive total refractive power.
Claim 6
Dependent Claim
62 words
An objective lens system for microscopes according to claim 4 wherein φ S1 and φ M1 have signs reverse to each other and satisfy the following condition: |φ.sub.S1 |≦|φ.sub.M1 | wherein the reference symbol φ S1 represents the refractive power of surface of said GRIN lens and the reference symbol φ M1 designates the refractive power of medium of said GRIN lens.
Claim 7
Dependent Claim
22 words
An objective lens system for microscopes according to claim 5 wherein said GRIN lens satisfies the following condition (3): 0.1>φ.sub.S1 ( 3)
Claim 8
Dependent Claim
64 words
An objective lens system for microscopes according to claim 6 wherein said GRIN lens satisfies the following condition (4): -10<d.sub.1.sup.2 ×N.sub.1d <-1×10.sup.-5 ( 4) wherein the reference symbol d 1 represents the thickness of said GRIN lens as measured at the central portion thereof and the reference symbol N 1d designates the refractive index distribution coefficient of the second order for said GRIN lens.
Claim 9
Dependent Claim
40 words
An objective lens system for microscopes according to claim 3 wherein said GRIN lens has a shape thicker at the central portion than at the marginal portion thereof, a negative refractive power of medium and a positive total refractive power.
Claim 10
Dependent Claim
53 words
An objective lens system for microscopes according to claim 8 wherein said GRIN lens satisfies the following condition: |φ.sub.S1 |>|φ.sub.M1 | wherein the reference symbol φ S1 represents the refractive power of surface of said GRIN lens and the reference symbol φ M1 designates the refractive power of medium of said GRIN lens.
Claim 11
Dependent Claim
64 words
An objective lens system for microscopes according to claim 9 wherein said GRIN lens satisfies the following condition (5): 10>d.sub.1.sup.2 ×N.sub.1d >1×10.sup.-5 ( 5) wherein the reference symbol d 1 represents the thickness of said GRIN lens as measured at the central portion thereof and the reference symbol N 1d designates the refractive index distribution coefficient of the second order for said GRIN lens.
Claim 12
Dependent Claim
20 words
An objective lens system for microscopes according to claim 1 comprising the first lens unit and a second lens unit.
Claim 13
Dependent Claim
97 words
An objective lens system for microscopes according to claim 11 wherein said second lens unit comprises a cemented doublet and satisfies the following condition (6): ν.sub.0p >ν.sub.0n ( 6) wherein the reference symbol ν 0p represents the Abbe's number of a lens element arranged in said cemented doublet and having a shape thicker at the central portion than at the marginal portion thereof, and the reference symbol ν 0n designates the Abbe's number of a lens element arranged in said cemented doublet and has a shape thicker at the marginal portion than at the central portion thereof.
Claim 14
Dependent Claim
79 words
An objective lens system for microscopes according to claim 12 wherein said second lens unit comprises a GRIN lens satisfying the following condition (7): 10>d.sup.2 ×N.sub.1d >1×10.sup.-5 ( 7) wherein the reference symbol d represents the thickness as measured at the central portion of the GRIN lens arranged in said second lens unit and the reference symbol N 1d designates the refractive index distribution coefficient of the second order for the GRIN lens arranged in said second lens unit.
Claim 15
Dependent Claim
27 words
An objective lens system for microscopes according to claim 12 wherein one of the lens elements composing said cemented doublet is designed as a GRIN lens element.
Claim 16
Dependent Claim
25 words
An objective lens system for microscopes according to claim 12 wherein both the lens elements composing said cemented doublet are designed as GRIN lens elements.
Claim 17
Dependent Claim
22 words
An objective lens system for microscopes according to claim 11 wherein said second lens unit is designed as a GRIN lens component.
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