Patent US3232197A successfully refreshed from Google Patents.
US3232197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical system for a single-lens reflex camera
Assignee: Individual
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Filing: 1962-06-06
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Granted: 1966-02-01
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Expires: 1982-06-06
Abstract
No abstract record available.
Inventors
- 👤 Kasahara Tadashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:37
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/02; G03B19/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
215 words
AN OPTICAL SYSTEM FOR A LENS SHUTTER TYPE SINGLE-LENS REFLEX CAMERA, COMPRISING A PHOTOGRAPHIC LENS WHICH CONSISTS OF THREE LENS PARTS SEPARATED FROM ONE ANOTHER BY AIR GAPS BETWEEN THEM AND IN WHICH THE FIRST LENS PART IS A CONDENSING LENS HAVING A CURVED SURFACE DIRECTED TOWARD THE OBJECT SPACE, THE SECOND LENS PART IS A DIFFUSIVE LENS HAVING A CONCAVE SURFACE TOWARD THE FIRST LENS PART, AND THE THIRD LENS PART IS A COMPOUND LENS HAVING A FLAT-CONCAVE LENS AND A DOUBLE CONVEX LENS WITH THE FLAT SURFACE OF SAID FLAT-CONCAVE LENS TOWARD SAID SECOND LENS PART, AND A GLASS BLOCK BETWEEN THE SECOND AND THIRD LENS PARTS HAVING FLAT SURFACES OPPOSED TO THE LENS PART ON EITHER SIDE THEREOF, SAID GLASS BLOCK HAVING A SMALL REFLECTOR THEREIN FOR REFLECTING PART OF THE LIGHT PASSING THROUGH SAID GLASS BLOCK TRANSVERSELY OF THE DIRECTION IN WHICH THE LIGHT PASSES THROUGH THE GLASS BLOCK, AND A FINDER HAVING A PLURALITY OF AUXILIARY LENSES AND AN EYEPIECE INTO WHICH THE REFLECTOR REFLECTS LIGHT, THE FIRST LENS PART AND THE SECOND LENS PART BEING SPACED A DISTANCE DI-II AND THE RESULTANT FOCAL DISTANCE OF THE FIRST LENS PART AND THE SECOND LENS PART BEING FX-II THE RESULTANT FOCAL DISTANCE OF THE WHOLE SYSTEM BEING F, AND IN WHICH:
Claim 2
Dependent Claim
215 words
AN OPTICAL SYSTEM FOR A LENS SHUTTER TYPE SINGLE-LENS REFLEX CAMERA, COMPRISING A PHOTOGRAPHIC LENS WHICH CONSISTS OF THREE LENS PARTS SEPARATED FROM ONE ANOTHER BY AIR GAPS BETWEEN THEM AND IN WHICH THE FIRST LENS PART IS A CONDENSING LENS HAVING A CURVED SURFACE DIRECTED TOWARD THE OBJECT SPACE, THE SECOND LENS PART IS A DIFFUSIVE LENS HAVING A CONCAVE SURFACE TOWARD THE FIRST LENS PART, AND THE THIRD LENS PART IS A COMPOUND LENS HAVING A FLAT-CONCAVE LENS AND A DOUBLE CONVEX LENS WITH THE FLAT SURFACE OF SAID FLAT-CONCAVE LENS TOWARD SAID SECOND LENS PART, AND A GLASS BLOCK BETWEEN THE SECOND AND THIRD LENS PARTS HAVING FLAT SURFACES OPPOSED TO THE LENS PART ON EITHER SIDE THEREOF, SAID GLASS BLOCK HAVING A SMALL REFLECTOR THEREIN FOR REFLECTING PART OF THE LIGHT PASSING THROUGH SAID GLASS BLOCK TRANSVERSELY OF THE DIRECTION IN WHICH THE LIGHT PASSES THROUGH THE GLASS BLOCK, AND A FINDER HAVING A PLURALITY OF AUXILIARY LENSES AND AN EYEPIECE INTO WHICH THE REFLECTOR REFLECTS LIGHT, THE FIRST LENS PART AND THE SECOND LENS PART BEING SPACED A DISTANCE DI-II AND THE RESULTANT FOCAL DISTANCE OF THE FIRST LENS PART AND THE SECOND LENS PART BEING FX-II THE RESULTANT FOCAL DISTANCE OF THE WHOLE SYSTEM BEING F, AND IN WHICH:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-31 | 1969-08-02 | 1970-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-31 | 1973-08-02 | 1974-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-31 | 1977-08-02 | 1978-02-01 | $7700.00 | Window Closed / Lapsed |