Patent US3909124A successfully refreshed from Google Patents.
US3909124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projection control circuit
Assignee: Eastman Kodak Co
•
Filing: 1972-05-22
•
Granted: 1975-09-30
•
Expires: 1992-05-22
Abstract
Abstract A change-over control circuit for controlling change-over operation between two projectors during either forward or reverse magazine operation, which includes first circuit means for providing a change-over cycle which precedes magazine transport during forward magazine operation and includes a second circuit means which provides a change-over cycle that follows magazine transport during reverse magazine operation. The control circuit may include flip-flop circuit means actuatable by a forward transport actuator for providing a first signal which initiates the change-over cycle and for providing second and third signals which are used as inputs to AND-gate circuits. Upon simultaneous occurrence of the second and third signals, the forward magazine transport is energized. The flip-flop circuit and the closure of a reverse transport actuator provide simultaneous inputs to second AND-gate circuits which generate an output signal that energizes the reverse magazine transport. The output signal for reverse magazine operation is coupled to the input of the flipflop circuit means and effects the change-over cycle at the end of the reverse magazine transport.
Inventors
- 👤 Peter Schmidt
- 👤 Karl-Heinz Haberle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:11
CPC Classifications
G; G03; G03B; G03B23/00; G03B23/18
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
212 words
For use with two slide projectors, each of the type having actuatable means for effecting forward or reverse slide magazine transport and an actuatable projection lamp, an improved control circuit having means for initiating forward and reverse magazine transport and for selectively controlling actuation of the magazine transport and the sequence in which a change-over of projection by one projection lamp to projection by the other projection lamp occurs in relation to the actuation of magazine transport, said circuit comprising: first circuit means, including flip-flop circuit means actuatable upon actuation of said forward magazine transport initiating means for providing a signal for effecting said change-over between the projectors, connectable to such projectors and operable to effect alternate forward magazine transport operation of the projectors and to alternately light and darken the projection lamps, said first circuit means being operable during a given operation to effect change over to the projection lamp of one projector before forward magazine transport of said other projector occurs; and second circuit means connectable to such projectors and operable to effect alternate reverse magazine transport operations of the projectors, said second circuit means being operable during a given operation to effect change-over to the projection lamp of one projector after reverse magazine transport of said one projector occurs.
Claim 2
Dependent Claim
212 words
For use with two slide projectors, each of the type having actuatable means for effecting forward or reverse slide magazine transport and an actuatable projection lamp, an improved control circuit having means for initiating forward and reverse magazine transport and for selectively controlling actuation of the magazine transport and the sequence in which a change-over of projection by one projection lamp to projection by the other projection lamp occurs in relation to the actuation of magazine transport, said circuit comprising: first circuit means, including flip-flop circuit means actuatable upon actuation of said forward magazine transport initiating means for providing a signal for effecting said change-over between the projectors, connectable to such projectors and operable to effect alternate forward magazine transport operation of the projectors and to alternately light and darken the projection lamps, said first circuit means being operable during a given operation to effect change over to the projection lamp of one projector before forward magazine transport of said other projector occurs; and second circuit means connectable to such projectors and operable to effect alternate reverse magazine transport operations of the projectors, said second circuit means being operable during a given operation to effect change-over to the projection lamp of one projector after reverse magazine transport of said one projector occurs.
Claim 3
Dependent Claim
50 words
A control circuit as recited in claim 1 wherein said first circuit means includes first logic circuit means receiving at least one input from said flip-flop circuit means for providing magazine transport and slide change in one projector from which the change-over is made, after the change-over has been effected.
Claim 4
Dependent Claim
51 words
A control circuit as recited in claim 2 including second logic circuit means receiving at least one input from said flip-flop circuit means or from said reverse transport initiating means, said second logic circuit means providing an output coupled to the reverse magazine transport means for energizing the reverse magazine transport.
Claim 5
Dependent Claim
32 words
A control circuit as recited in claim 3 wherein said output from said second logic circuit means is coupled to the input of said flip-flop circuit means for providing an input thereof.
Claim 6
Dependent Claim
48 words
A control circuit as recited in claim 4 wherein the reverse magazine transport means includes means for interrupting said coupled output at the end of reverse magazine transport so that said flip-flop circuit means are caused to initiate change-over to one projector after reverse magazine transport is effected.
Claim 7
Dependent Claim
23 words
A control circuit as recited in claim 5 wherein said means for interrupting said output comprises switch means actuatable by the magazine transport.
Claim 8
Dependent Claim
258 words
For use with two slide projectors, each of the type having actuatable means for effecting forward or reverse slide magazine transport and an actuatable projection lamp, an improved control circuit for selectively controlling actuation of each of the magazine transport means and the sequence in which change-over of projection by one projection lamp to projection by the other projection lamp occurs in relation to the actuation Of the respective magazine transport, said circuit comprising: means for initiating forward and reverse magazine transport; first flip-flop circuit means for providing a signal to effect alternate slide magazine transport; second flip-flop circuit means for providing a signal in response to initiation of said forward transport means; third flip-flop circuit means responsive to the signal from said first flip-flop circuit means for providing a signal to effect alternate lighting and darkening of the projection lamps; first circuit means coupled with all of said flip-flop circuit means and being responsive to operation of said second flip-flop circuit means upon actuation of said forward transport initiating means for initiating forward transport of said one projector after the projection lamp in said one projector has been darkened; and second circuit means responsive to signals from said first and third flip-flop circuit means upon actuation of said reverse transport initiating means for deactivating said forward transport means, and for initiating reverse transport of said other projector, and for darkening said projection lamp of said first projector and for energizing the projection lamp of said other projector after reverse transport of said other projector has been completed.
Claim 9
Dependent Claim
258 words
For use with two slide projectors, each of the type having actuatable means for effecting forward or reverse slide magazine transport and an actuatable projection lamp, an improved control circuit for selectively controlling actuation of each of the magazine transport means and the sequence in which change-over of projection by one projection lamp to projection by the other projection lamp occurs in relation to the actuation Of the respective magazine transport, said circuit comprising: means for initiating forward and reverse magazine transport; first flip-flop circuit means for providing a signal to effect alternate slide magazine transport; second flip-flop circuit means for providing a signal in response to initiation of said forward transport means; third flip-flop circuit means responsive to the signal from said first flip-flop circuit means for providing a signal to effect alternate lighting and darkening of the projection lamps; first circuit means coupled with all of said flip-flop circuit means and being responsive to operation of said second flip-flop circuit means upon actuation of said forward transport initiating means for initiating forward transport of said one projector after the projection lamp in said one projector has been darkened; and second circuit means responsive to signals from said first and third flip-flop circuit means upon actuation of said reverse transport initiating means for deactivating said forward transport means, and for initiating reverse transport of said other projector, and for darkening said projection lamp of said first projector and for energizing the projection lamp of said other projector after reverse transport of said other projector has been completed.
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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |