Patent US3817602A successfully refreshed from Google Patents.
US3817602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic objective particularly for supermicrofilm
Assignee: Pentax Corp
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Filing: 1972-07-03
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Granted: 1974-06-18
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Expires: 1992-07-03
Abstract
Abstract A photographic objective particularly adapted for use during exposure or projection of supermicrofilm. The objective has a viewing angle on the order of + OR - 12* with a relatively large aperture having an F-number of 1.4, the magnification being on the order of 1/100. At the same time the objective has highly favorable aberration conditions and is well-suited to be used with supermicrofilm.
Inventors
- 👤 T Kazamaki
- 👤 K Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:06
CPC Classifications
G; G02; G02B; G02B13/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
266 words
A photographic objective to be used during exposure or projection of supermicrofilm, said objective having from front to rear a series of 10 lenses L1-L10, of which the rear lens L10 is a cover glass, with lenses L4 and L5 having a common surface of radius r8 and with lenses L6 and L7 having a common surface of radius r11, wherein for a focal length of 100 mm and for an aperture ratio of 1:1.4, the objective has the data of the following Table I, in which the radii of curvature of the sequential lens surfaces are set forth in the second column, with the thickness of the several lens elements being indicated by t and the distance from one lens to the next by d, and the glass constants n representing the refractive index at the d-line while v represents the Abbe number: TABLE I Aperture Focal Length 100mm Ratio Glass Constants Lens 1:1.4 n v r1 +545.33 mm L1 t1 12.50mm 1.51633 64.1 r2 +148.66 mm d1 77.51mm r3 +382.34 mm L2 t2 20.00mm 1.77250 49.6 r4 -423.95 mm d2 1.25mm r5 +119.16 mm L3 t3 20.00mm 1.77250 49.6 r6 +222.00 mmd3 1.25mmr7 +59.61 mm L4 t4 22.00mm 1.77250 49.6 r8 +104.63 mm L5 t5 14.38mm 1.80518 25.5 r9 +35.28 mmd4 18.75mmr10 -144.41mm L6 t6 15.00mm 1.72151 29.3 r11 +41.72 mm L7 t7 20.00mm 1.80400 46.6 r12 -813.93 mmd5 1.25mmr13 +279.35mm L8 t8 19.00mm 1.81554 44.4 r14 -183.49mm d6 1.25mm r15 +72.88 mm L9 t9 18.13mm 1.80400 39.6 r16 +122.05 mm d7 7.50mm r17 infinity L10 t10 40.00mm 1.52600 58.8 r18 infinity (image surface)
Claim 2
Dependent Claim
266 words
A photographic objective to be used during exposure or projection of supermicrofilm, said objective having from front to rear a series of 10 lenses L1-L10, of which the rear lens L10 is a cover glass, with lenses L4 and L5 having a common surface of radius r8 and with lenses L6 and L7 having a common surface of radius r11, wherein for a focal length of 100 mm and for an aperture ratio of 1:1.4, the objective has the data of the following Table I, in which the radii of curvature of the sequential lens surfaces are set forth in the second column, with the thickness of the several lens elements being indicated by t and the distance from one lens to the next by d, and the glass constants n representing the refractive index at the d-line while v represents the Abbe number: TABLE I Aperture Focal Length 100mm Ratio Glass Constants Lens 1:1.4 n v r1 +545.33 mm L1 t1 12.50mm 1.51633 64.1 r2 +148.66 mm d1 77.51mm r3 +382.34 mm L2 t2 20.00mm 1.77250 49.6 r4 -423.95 mm d2 1.25mm r5 +119.16 mm L3 t3 20.00mm 1.77250 49.6 r6 +222.00 mmd3 1.25mmr7 +59.61 mm L4 t4 22.00mm 1.77250 49.6 r8 +104.63 mm L5 t5 14.38mm 1.80518 25.5 r9 +35.28 mmd4 18.75mmr10 -144.41mm L6 t6 15.00mm 1.72151 29.3 r11 +41.72 mm L7 t7 20.00mm 1.80400 46.6 r12 -813.93 mmd5 1.25mmr13 +279.35mm L8 t8 19.00mm 1.81554 44.4 r14 -183.49mm d6 1.25mm r15 +72.88 mm L9 t9 18.13mm 1.80400 39.6 r16 +122.05 mm d7 7.50mm r17 infinity L10 t10 40.00mm 1.52600 58.8 r18 infinity (image surface)
Claim 3
Dependent Claim
260 words
A photographic objective to be used during exposure or projection of supermicrofilm, said objective having from front to rear nine lenses designated L1-L9, wherein lenses L4 and L5 are cemented together and have a common surface of radius r8 while lenses L6 and L7 are cemented together and have a common surface of radius r11, wherein for a focal length of 100 mm for the entire lens system and an aperture ratio of 1:1.4, the objective has the data of the following Table III, in which the second column designates the radii of curvature of the successive lens surfaces, the third column designates the thicknesses t of the successive lenses and the distance d therebetween while the glass constants in the last two columns are designated n for the refractive index along the d-line and v for the Abbe number: TABLE III Aperture Focal Length 100 mm Ratio Glass Constants 1: 1.4 Lens n v r1 +521.24 mm L1 t1 12.46mm 1.51112 60.5 r2 +140.57 mm d1 77.28mm r3 +223.45 mm L2 t2 19.94mm 1.77250 49.6 r4 -480.98 mm d2 1.25mm r5 +101.51 mm L3 t3 19.94mm 1.77250 49.6 r6 +160.04 mm d3 1.25mm r7 +63.27 mm L4 t4 24.43mm 1.77250 49.6 r8 +132.50 mm L5 t5 14.33mm 1.80518 25.5 r9 +32.39 mm d4 15.58mm r10 -79.20 mm L6 t6 14.96mm 1.72151 29.3 r11 +43.39 mm L7 t7 19.94mm 1.80400 46.6 r12 -259.15 mm d5 1.25mm r13 +191.36 mm L8 t8 18.95mm 1.80400 46.6 r14 -384.24 mm d6 1.25mm r15 +85.76 mm L9 t9 17.45mm 1.83400 37.2 r16 +1836.31 mm
Claim 4
Dependent Claim
260 words
A photographic objective to be used during exposure or projection of supermicrofilm, said objective having from front to rear nine lenses designated L1-L9, wherein lenses L4 and L5 are cemented together and have a common surface of radius r8 while lenses L6 and L7 are cemented together and have a common surface of radius r11, wherein for a focal length of 100 mm for the entire lens system and an aperture ratio of 1:1.4, the objective has the data of the following Table III, in which the second column designates the radii of curvature of the successive lens surfaces, the third column designates the thicknesses t of the successive lenses and the distance d therebetween while the glass constants in the last two columns are designated n for the refractive index along the d-line and v for the Abbe number: TABLE III Aperture Focal Length 100 mm Ratio Glass Constants 1: 1.4 Lens n v r1 +521.24 mm L1 t1 12.46mm 1.51112 60.5 r2 +140.57 mm d1 77.28mm r3 +223.45 mm L2 t2 19.94mm 1.77250 49.6 r4 -480.98 mm d2 1.25mm r5 +101.51 mm L3 t3 19.94mm 1.77250 49.6 r6 +160.04 mm d3 1.25mm r7 +63.27 mm L4 t4 24.43mm 1.77250 49.6 r8 +132.50 mm L5 t5 14.33mm 1.80518 25.5 r9 +32.39 mm d4 15.58mm r10 -79.20 mm L6 t6 14.96mm 1.72151 29.3 r11 +43.39 mm L7 t7 19.94mm 1.80400 46.6 r12 -259.15 mm d5 1.25mm r13 +191.36 mm L8 t8 18.95mm 1.80400 46.6 r14 -384.24 mm d6 1.25mm r15 +85.76 mm L9 t9 17.45mm 1.83400 37.2 r16 +1836.31 mm
References Cited (Backward Citations)
US3506340A
Cited
US3551030A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |