US4219261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic camera with a means for coordinating and indicating depth of field focusing and objective setting values
Assignee: Individual
•
Filing: 1978-12-11
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Granted: 1980-08-26
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Expires: 1998-12-11
Abstract
Abstract A photographic camera having an objective, a viewfinder coupled to said objective and comprising means for converting the setting of the objective into electrical signal values, x' actual , memory storage means for storing the electrical signal values, the memory storage means storing a first signal value, x v ', corresponding to the objective setting associated with a far point desired to be photographed, and for storing a second signal value, x h ', corresponding to the objective setting associated with a near point desired to be photographed, and calculator means connected to the memory storage means for automatically calculating a desired stop figure, k desired , and a desired distance-setting value, x' desired , associated with the first and second signal values.
Inventors
- 👤 Ortwin Rosner
- 👤 Karl-Peter Strauss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:17
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/28; G02B7/30; G03; G03B; G03B17/00; G03B17/18; G03B17/20
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
126 words
A photographic camera having an objective, a viewfinder coupled to said objective and comprising: (a) means for converting the setting of said objective into electrical signal values, x' actual , (b) memory storage means for storing said electrical signal values, said memory storage means storing a first signal value, x v ', corresponding to the objective setting associated with a far point desired to be photographed, and for storing a second signal value, x h ', corresponding to the objective setting associated with a near point desired to be photographed, and (c) calculator means connected to said memory storage means for automatically calculating a desired stop figure, k desired , and a desired distance-setting value, x' desired , associated with said first and second signal values.
Claim 2
Dependent Claim
126 words
A photographic camera having an objective, a viewfinder coupled to said objective and comprising: (a) means for converting the setting of said objective into electrical signal values, x' actual , (b) memory storage means for storing said electrical signal values, said memory storage means storing a first signal value, x v ', corresponding to the objective setting associated with a far point desired to be photographed, and for storing a second signal value, x h ', corresponding to the objective setting associated with a near point desired to be photographed, and (c) calculator means connected to said memory storage means for automatically calculating a desired stop figure, k desired , and a desired distance-setting value, x' desired , associated with said first and second signal values.
Claim 3
Dependent Claim
20 words
A photographic camera as recited in claim 1 further comprising means for indicating the desired stop figure, k desired .
Claim 4
Dependent Claim
47 words
A photographic camera as recited in claim 1 further comprising first comparator means connected to said converting means and said calculator means for comparing the desired distance-setting value x' desired with the actual objective setting value, x' actual , and means for indicating the equivalent of same.
Claim 5
Dependent Claim
39 words
A photographic camera as recited in claim 3 wherein said calculator means comprises a first calculator for calculating the desired stop figure, k desired , and a second calculator for calculating the desired distance setting value x' desired .
Claim 6
Dependent Claim
28 words
A photographic camera as recited in claim 4 further comprising means for indicating the desired stop figure, k desired , said indicating means connected to said first calculator.
Claim 7
Dependent Claim
55 words
A photographic camera as recited in claim 5 further comprising second comparator means connected to said first calculator for comparing the desired stop figure k desired with a reference value corresponding to the largest stop figure for the camera objective, k G , and means for providing an indication when k desired >k G .
Claim 8
Dependent Claim
19 words
A photographic camera as recited in claim 6 further comprising means for erasing said first and second signal values.
Claim 9
Dependent Claim
39 words
A photographic camera as recited in claim 7 wherein said erasing means is connected to said first calculator for erasing said first and second signal values, said erasing means operable when k desired is greater than k G .
Claim 10
Dependent Claim
21 words
A photographic camera as recited in claim 6 further comprising means for providing an indication when k desired ≦k G .
Claim 11
Dependent Claim
40 words
A photographic camera as recited in claim 1 further comprising a brightness control circuit connected to said calculator means for automatically determining exposure time, t, in response to film sensitivity, object brightness and the desired stop figure, k desired .
Claim 12
Dependent Claim
35 words
A photographic camera as recited in claim 10 further comprising a comparator for comparing said exposure time, t, to a predetermined maximum exposure time, t max , and means for indicating when t>t max .
Claim 13
Dependent Claim
17 words
A photographic camera as recited in claim 11 further comprising means for indicating when t≦t max .
Claim 14
Dependent Claim
22 words
A photographic camera as recited in claim 10 further comprising means for erasing said stored electrical signal values when t>t max .
Claim 15
Dependent Claim
27 words
A photographic camera as recited in claim 1 wherein said means for converting the setting of the objective into electrical signal values comprises an incremental path transmitter.
Claim 16
Dependent Claim
44 words
A photographic camera as recited in claim 14 wherein said incremental path transmitter provides digital signals, and said camera further comprises a reversible digital counter providing digital signals to said memory storage device in response to said digital signals from said incremental path transmitter.
Claim 17
Dependent Claim
35 words
A photographic camera as recited in claim 14 wherein said calculator means comprises a digital-to-analog converter connected to said memory storage means and a variable resistor means connected to an output of said digital-to-analog converter.
References Cited (Backward Citations)
US4154517A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-08-26 | 1984-02-25 | 1984-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-26 | 1988-02-25 | 1988-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-26 | 1992-02-25 | 1992-08-26 | $7700.00 | Window Closed / Lapsed |