Arrangement for indication of the zone of sharpness
Abstract
Abstract A CAMERA HAVING AN OBJECTIVE AND FOCUSING MECHANISM FOR THE OBJECTIVE. A DIAPHRAGM IS SITUATED WITHIN THE OBJECTIVE AND IS ADJUSTABLE WITH RESPECT TO THE BRIGHTNESS OF THE SCENE TO BE TAKEN. A VIEWFINDER SYSTEM AND AT LEAST FIRST AND SECOND INDICATORS ARE VISIBLE IN THE VIEWFINDER. AN ADJUSTING DEVICE FOR AT LEAST ONE OF THE INDICATORS IN ARRANGED TO VARY THE DISTANCE BETWEEN THE INDICATORS. THE DISTANCE DEFINES A SECTION F LINE VISIBLE IN THE VIEWFINDER. THE SECTION OF LINE CORRESPONDS TO A PERSPECTIVE REPRODUCTION OF A FICTITIOUS SECTION OF LINE OF KNOWN SIZE. THE FICTITIOUS SECTION OF LINE IS SUPPOSED TO BE SITUATED ON ONE OF THE LIMITS OF THE DEPTH OF FIELD. A CALCULATING MECHANISM IS PROVIDED FOR COMPUTING THE DEPTH OF FIELD AND THE LENGTH OF THE DISTANCE FROM A GIVEN SET OF VALUES AND CONTROLLING THE ADJUSTING MECHANISM ACCORDINGLY. THE VALUES DETERMINE AT LEAST ONE LIMIT OF THE DEPTH OF FIELD AND COMPRISES AT LEAST THE DIAPHRAGM APERTURE AND THE SETTING OF THE FOCUSING MECHANISM.
Inventors
- 👤 Hermann Holler
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |