US3554104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exposure control for photographic cameras
Assignee: Agfa Gevaert AG
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Filing: 1968-04-18
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Granted: 1971-01-12
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Expires: 1988-04-18
Abstract
Abstract An exposure control for photographic cameras wherein the electrical delay circuit for the shutter is adjustable by way of a manually operated first selector which simultaneously adjusts a regulating device serving to adjust the sensitivity of an exposure meter for the diaphragm. A second manually operated selector can be used to adjust the diaphragm independently of or by way of the exposure meter. Alternatively, the first selector can also serve to adjust the diaphragm at the will of the user.
Inventors
- 👤 Alfred Winkler
- 👤 Karl Wagner
- 👤 Dieter Engelsmann
- 👤 Rolf Schroeder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:57
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/12
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
101 words
An exposure control for photographic cameras, comprising An adjustable shutter arranged to furnish a plurality of exposure times; an adjustable electrical delay circuit operative to adjust said shutter so as to select the exposure time; an adjustable diaphragm arranged to furnish a plurality of aperture sizes; exposure meter means operatively connected with and arranged to adjust said diaphragm so as to select the aperture size, said exposure meter means having a range of sensitivities; adjustable regulating means for selecting the sensitivity of said exposure meter means; and manually operated selector means for simultaneously adjusting said regulating means and said delay circuit.
Claim 2
Dependent Claim
101 words
An exposure control for photographic cameras, comprising An adjustable shutter arranged to furnish a plurality of exposure times; an adjustable electrical delay circuit operative to adjust said shutter so as to select the exposure time; an adjustable diaphragm arranged to furnish a plurality of aperture sizes; exposure meter means operatively connected with and arranged to adjust said diaphragm so as to select the aperture size, said exposure meter means having a range of sensitivities; adjustable regulating means for selecting the sensitivity of said exposure meter means; and manually operated selector means for simultaneously adjusting said regulating means and said delay circuit.
Claim 3
Dependent Claim
25 words
An exposure control as defined in claim 1, wherein said exposure meter means comprises a movable output portion which is directly coupled with said diaphragm.
Claim 4
Dependent Claim
34 words
An exposure control as defined in claim 1, wherein said exposure meter means comprises a movable output portion and means for adjusting said diaphragm as a function of the position of said output portion.
Claim 5
Dependent Claim
26 words
An exposure control as defined in claim 1, wherein said delay circuit comprises variable resistor means, said variable resistor means being adjustable by said selector means.
Claim 6
Dependent Claim
30 words
An exposure control as defined in claim 1, wherein said regulating means comprises variable resistor means forming part of said exposure meter means and being adjustable by said selector means.
Claim 7
Dependent Claim
39 words
An exposure control as defined in claim 1, further comprising a plurality of resistors each having a different resistance, said selector means comprising means for connecting a selected resistor into said delay circuit to thereby adjust said delay circuit.
Claim 8
Dependent Claim
58 words
An exposure control as defined in claim 1, wherein said exposure meter means comprises a second electric circuit and said regulating means comprises a plurality of resistors each having a different resistance, said selector means comprising means for connecting at least one of said resistors into said second circuit in each of several positions of said selector means.
Claim 9
Dependent Claim
49 words
An exposure control as defined in claim 1, wherein said exposure meter means comprises a light meter movable between a plurality of positions each of which corresponds to a different sensitivity of said exposure meter means, said selector means comprising means for moving said light meter between said positions.
Claim 10
Dependent Claim
40 words
An exposure control as defined in claim 1, wherein said exposure meter means comprises photosensitive receiver means exposed to scene light and said regulating means comprises means for changing the amounts of scene light which can reach said receiver means.
Claim 11
Dependent Claim
55 words
An exposure control as defined in claim 1, wherein said exposure meter means comprises a light meter having an output member movable between a plurality of positions each of which represents a different aperture size, and a scale adjacent to said output member and having graduations indicating the aperture sizes represented by said output member.
Claim 12
Dependent Claim
109 words
An exposure control for photographic cameras, comprising an adjustable shutter arranged to furnish a plurality of exposure times; an adjustable electrical delay circuit operative to adjust said shutter so as to select the exposure time; an adjustable diaphragm arranged to furnish a plurality of aperture sizes; exposure meter means for adjusting said diaphragm so as to select the aperture size, said exposure meter means having a range of sensitivities; adjustable regulating means for selecting the sensitivity of said exposure meter means; first selector means for adjusting said regulating means and said delay circuit; and manually operated second selector means for adjusting said diaphragm independently of said exposure meter means.
Claim 13
Dependent Claim
109 words
An exposure control for photographic cameras, comprising an adjustable shutter arranged to furnish a plurality of exposure times; an adjustable electrical delay circuit operative to adjust said shutter so as to select the exposure time; an adjustable diaphragm arranged to furnish a plurality of aperture sizes; exposure meter means for adjusting said diaphragm so as to select the aperture size, said exposure meter means having a range of sensitivities; adjustable regulating means for selecting the sensitivity of said exposure meter means; first selector means for adjusting said regulating means and said delay circuit; and manually operated second selector means for adjusting said diaphragm independently of said exposure meter means.
Claim 14
Dependent Claim
76 words
An exposure control as defined in claim 11, wherein said second selector means comprises locking means for disconnecting said exposure meter means from said diaphragm, said second selector means being movable between at least one first position in which said locking means disconnects said exposure Meter means from said diaphragm and at least one second position in which said diaphragm furnishes an aperture size which is a function of the position of said second selector means.
Claim 15
Dependent Claim
110 words
An exposure control for photographic cameras, comprising an adjustable shutter arranged to furnish a plurality of exposure times; an adjustable electrical delay circuit operative to adjust said shutter so as to select the exposure time; an adjustable diaphragm arranged to furnish a plurality of aperture sizes; exposure meter means for adjusting said diaphragm so as to select the aperture size, said exposure meter means having a range of sensitivities; adjustable regulating means for selecting the sensitivity of said exposure meter means; first selector means for adjusting said regulating means and said delay circuit; and manually operated second selector means for adjusting said diaphragm by way of said exposure meter means.
Claim 16
Dependent Claim
110 words
An exposure control for photographic cameras, comprising an adjustable shutter arranged to furnish a plurality of exposure times; an adjustable electrical delay circuit operative to adjust said shutter so as to select the exposure time; an adjustable diaphragm arranged to furnish a plurality of aperture sizes; exposure meter means for adjusting said diaphragm so as to select the aperture size, said exposure meter means having a range of sensitivities; adjustable regulating means for selecting the sensitivity of said exposure meter means; first selector means for adjusting said regulating means and said delay circuit; and manually operated second selector means for adjusting said diaphragm by way of said exposure meter means.
Claim 17
Dependent Claim
129 words
An exposure control for photographic cameras, comprising an adjustable shutter arranged to furnish a plurality of exposure times; an adjustable electrical delay circuit operative to adjust said shutter so as to select the exposure time; an adjustable diaphragm arranged to furnish a plurality of aperture sizes; exposure meter means for adjusting said diaphragm so as to select the aperture size, said exposure meter means having a range of sensitivities; adjustable regulating means for selecting the sensitivity of said exposure meter means; and selector means for adjusting said regulating means and said delay circuit, said selector means being movable to and from at least one first position in which it adjusts said regulating means and said delay circuit and at least one second position in which it adjusts said diaphragm.
Claim 18
Dependent Claim
129 words
An exposure control for photographic cameras, comprising an adjustable shutter arranged to furnish a plurality of exposure times; an adjustable electrical delay circuit operative to adjust said shutter so as to select the exposure time; an adjustable diaphragm arranged to furnish a plurality of aperture sizes; exposure meter means for adjusting said diaphragm so as to select the aperture size, said exposure meter means having a range of sensitivities; adjustable regulating means for selecting the sensitivity of said exposure meter means; and selector means for adjusting said regulating means and said delay circuit, said selector means being movable to and from at least one first position in which it adjusts said regulating means and said delay circuit and at least one second position in which it adjusts said diaphragm.
Claim 19
Dependent Claim
56 words
An exposure control as defined in claim 14, wherein said exposure meter means comprises a second electric circuit, said delay circuit including photosensitive receiver means in the first position of said selector means and further comprising switchover means for connecting said receiver means only in said second circuit in the second position of said selector means.
Claim 20
Dependent Claim
109 words
An exposure control as defined in claim 15, wherein said switchover means comprises two movable contacts connected with said selector means, one of said contacts being connected with said receiver means and the other contact being connected with an exposure time-determining element of said delay circuit, and a pair of fixed contacts, for each of said movable contacts, one fixed contact of each pair being connected in said delay circuit and the other fixed contact of each pair being connected in said second circuit, said movable contacts being in engagement with a different fixed contact of the respective pair in said first and second positions of said selector means.
Claim 21
Dependent Claim
37 words
An exposure control as defined in claim 16, wherein said second circuit comprises a light meter having two terminals one of which is connected with said other fixed contact of each of said pairs of fixed contacts.
Claim 22
Dependent Claim
52 words
An exposure control as defined in claim 15, wherein said regulating means comprises a device at least a portion of which is connected for movement with said selector means and is arranged to change the amounts of scene light which can reach said receiver means in different positions of said selector means.
Claim 23
Dependent Claim
56 words
An exposure control as defined in claim 18, wherein said selector means is movable between a series of first and second positions and wherein said device is arranged to reduce the amounts of scene light which can reach said receiver means in response to movement of said selector means to successive first and second positions respectively.
Claim 24
Dependent Claim
40 words
An exposure control as defined in claim 19, wherein said device is arranged to admit maximum amounts of light to said receiver means in the initial of each of said series of first and second positions of said selector means.
Claim 25
Dependent Claim
17 words
An exposure control as defined in claim 20, wherein said initial positions are adjacent to each other.
Claim 26
Dependent Claim
52 words
An exposure control as defined in claim 18, wherein said device comprises an opaque mask which is rigid with said selector means and is provided with a window having portions of different area arranged to admit different amounts of scene light to said receiver means in different positions of said selector means.
Claim 27
Dependent Claim
16 words
An exposure control as defined in claim 22, wherein said window comprises two tapering end portions.
Claim 28
Dependent Claim
60 words
An exposure control as defined in claim 16, wherein said element is a variable resistor having two resistor portions and a sliding contact portion provided on said selector means, said sliding contact portion being in engagement with one of said resistor portions in the first position and with the other resistor portion in the other position of said selector means.
Claim 29
Dependent Claim
22 words
An exposure control as defined in claim 24, wherein said selector means is movable between a plurality of first and second positions.
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |