US3602578A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Micro-objective reduction lens system
Assignee: International Business Machines Corp
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Filing: 1970-04-02
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Granted: 1971-08-31
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Expires: 1990-04-02
Abstract
Abstract A lens group is described for use as a reduction lens, consisting of 10 lens elements. The first and second elements are cemented together to form a meniscus doublet lens as are the third and fourth, fifth and sixth, eighth and ninth elements. The seventh element is a positive meniscus lens and the 10th element is a biconcave lens. The lens group has very high uniform resolution over the flat image field and has unmeasurable distortion, less than a hundredth part of the wavelength of light. The constructional data of the lens elements have upper and lower limits and nine embodiments of lens groups of the present invention are set forth, all of which provide the high resolution and exceptionally low distortion value.
Inventors
- 👤 Raymond E Tibbetts
- 👤 Janusz S Wilczynski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:57
CPC Classifications
G; G02; G02B; G02B13/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
313 words
A reduction lens system comprising first, second, third, fourth, fifth, sixth, seventh, eighth, ninth and tenth optically aligned lens elements wherein said first and second lens elements are cemented together, said third and fourth lens elements are cemented together, said fifth and sixth lens elements are cemented together and said eighth and ninth lens elements are cemented together to form four meniscus doublet lenses, wherein said first lens element has radii of curvature R1 and R2 and thickness t1, said second lens element has radii of curvature R2 and R3 and thickness t2, said third lens element has radii of curvature R4 and R5 and thickness t3, said fourth lens element has radii of curvature R5 and R6 and thickness t4, said fifth lens element has radii of curvature R7 and R8 and thickness t5, said sixth lens element has radii of curvatUre R8 and R9 and thickness t6, said seventh lens element has radii of curvature R10 and R11 and thickness t7, said eighth lens element has radii of curvature R12 and R13 and thickness t8, said ninth lens element has radii of curvature R13 and R14 and thickness t9 and said tenth lens element has radii of curvature R15 and R16 and thickness t10; and wherein said second and third lens elements are separated by an axial distance S1, said fourth and fifth lens elements are separated by an axial distance S2, said sixth and seventh lens elements are separated by an axial distance S3, said seventh and eighth lens elements are separated by an axial distance S4 and said ninth and tenth lens elements are separated by an axial distance S5; ans wherein said radii, thicknesses and spacings are within limits as follows where F is the effective focal length of the lens group. 1.77F<+R1<1.91F0.20F<t1<0.25F 1.77F<R2<1.91F0.068F<t2<0.112F 4.50F<+R3<8.40F0.023F<S1<0.028F 1.15F<+R4<1.30F0.19F<t3<0.23F 1.88F<-R5<2.62F0.074F<t4<0.106F 2.09F<R6<2.90F0.023F<S2<0.028F 0.72F<+R7<0.74F0.17F<t5<0.19F 3.25F<-R8<3.80F0.079F<t6<0.098F 1.11F<+R9<1.20F0.47F<S3<0.48F 0.69F<+R10<0.76F0.079F<t7<0.098F 0.91F<+R11<0.98F0.021F<S4<0.029F 0.52F<+R12<0.55F0.10F<t8<0.11F 0.37F<-R13<0.39F0.067F<t9<0.075F 9.70F<+R14<15.0F0.032F<S5<0.034F 0.66F<R15<0.68F0.066F<t10<0.071F 0.88F<+R16<0.90F
Claim 2
Dependent Claim
313 words
A reduction lens system comprising first, second, third, fourth, fifth, sixth, seventh, eighth, ninth and tenth optically aligned lens elements wherein said first and second lens elements are cemented together, said third and fourth lens elements are cemented together, said fifth and sixth lens elements are cemented together and said eighth and ninth lens elements are cemented together to form four meniscus doublet lenses, wherein said first lens element has radii of curvature R1 and R2 and thickness t1, said second lens element has radii of curvature R2 and R3 and thickness t2, said third lens element has radii of curvature R4 and R5 and thickness t3, said fourth lens element has radii of curvature R5 and R6 and thickness t4, said fifth lens element has radii of curvature R7 and R8 and thickness t5, said sixth lens element has radii of curvatUre R8 and R9 and thickness t6, said seventh lens element has radii of curvature R10 and R11 and thickness t7, said eighth lens element has radii of curvature R12 and R13 and thickness t8, said ninth lens element has radii of curvature R13 and R14 and thickness t9 and said tenth lens element has radii of curvature R15 and R16 and thickness t10; and wherein said second and third lens elements are separated by an axial distance S1, said fourth and fifth lens elements are separated by an axial distance S2, said sixth and seventh lens elements are separated by an axial distance S3, said seventh and eighth lens elements are separated by an axial distance S4 and said ninth and tenth lens elements are separated by an axial distance S5; ans wherein said radii, thicknesses and spacings are within limits as follows where F is the effective focal length of the lens group. 1.77F<+R1<1.91F0.20F<t1<0.25F 1.77F<R2<1.91F0.068F<t2<0.112F 4.50F<+R3<8.40F0.023F<S1<0.028F 1.15F<+R4<1.30F0.19F<t3<0.23F 1.88F<-R5<2.62F0.074F<t4<0.106F 2.09F<R6<2.90F0.023F<S2<0.028F 0.72F<+R7<0.74F0.17F<t5<0.19F 3.25F<-R8<3.80F0.079F<t6<0.098F 1.11F<+R9<1.20F0.47F<S3<0.48F 0.69F<+R10<0.76F0.079F<t7<0.098F 0.91F<+R11<0.98F0.021F<S4<0.029F 0.52F<+R12<0.55F0.10F<t8<0.11F 0.37F<-R13<0.39F0.067F<t9<0.075F 9.70F<+R14<15.0F0.032F<S5<0.034F 0.66F<R15<0.68F0.066F<t10<0.071F 0.88F<+R16<0.90F
Claim 3
Dependent Claim
13 words
A reduction lens system according to claim 1 having numerical data as follows:
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |