US4566769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply unit for electronic flash
Assignee: Olympus Corp
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Filing: 1983-09-23
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Granted: 1986-01-28
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Expires: 2003-09-23
Abstract
Abstract A power supply unit for electronic flash includes a converter drive circuit which is activated when a main switch is turned on or in response to the completion of a shutter operation or the completion of a film winding operation, thereby driving a converter for oscillation. The converter charges a main discharge capacitor to a given voltage, and when the given voltage is reached, the converter drive circuit is deactivated, thereby automatically ceasing the oscillation of the converter.
Inventors
- 👤 Akira Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:44
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/30; H05B41/32
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
253 words
A power supply unit for electronic flash, comprising: a converter for converting an output from a low voltage output source to a high d.c. voltage; a main discharge capacitor adapted to be charged by an the d.c. output from the converter; means for detecting when the main discharge capacitor has been charged to a given voltage; a manual main switch for starting the converter; a converter driving latch circuit activated by an operation of the main switch to deliver a drive signal to the converter so that the converter may charge the main discharge capacitor and deactivated by a signal from the detecting means to cease to drive the converter a film winding initiate switch which is mechanically interlocked with a completion of a shutter operation; a winding latch circuit activated by an operation of the film winding initiate switch to deactivate the converter driving latch circuit and to deliver a drive signal to a film winding motor; a winding complete switch which is mechanically interlocked with a completion of a film winding operation; a brake latch circuit activated by an operation of the winding complete switch to deactivate the winding latch circuit and to deliver a brake signal to the film winding motor; means for supplying a start signal to the converter driving latch circuit which activates the latter circuit when initiating the operation of the brake latch circuit; and means for deactivating the brake latch circuit at a given time interval after the initiation of operation of the brake latch circuit.
Claim 2
Dependent Claim
253 words
A power supply unit for electronic flash, comprising: a converter for converting an output from a low voltage output source to a high d.c. voltage; a main discharge capacitor adapted to be charged by an the d.c. output from the converter; means for detecting when the main discharge capacitor has been charged to a given voltage; a manual main switch for starting the converter; a converter driving latch circuit activated by an operation of the main switch to deliver a drive signal to the converter so that the converter may charge the main discharge capacitor and deactivated by a signal from the detecting means to cease to drive the converter a film winding initiate switch which is mechanically interlocked with a completion of a shutter operation; a winding latch circuit activated by an operation of the film winding initiate switch to deactivate the converter driving latch circuit and to deliver a drive signal to a film winding motor; a winding complete switch which is mechanically interlocked with a completion of a film winding operation; a brake latch circuit activated by an operation of the winding complete switch to deactivate the winding latch circuit and to deliver a brake signal to the film winding motor; means for supplying a start signal to the converter driving latch circuit which activates the latter circuit when initiating the operation of the brake latch circuit; and means for deactivating the brake latch circuit at a given time interval after the initiation of operation of the brake latch circuit.
Claim 3
Dependent Claim
25 words
A power supply unit according to claim 1 in which said means for supplying a start signal is disabled when the main switch is off.
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) | 1989-01-27 | 1989-07-29 | 1990-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-27 | 1993-07-29 | 1994-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-27 | 1997-07-29 | 1998-01-28 | $7700.00 | Window Closed / Lapsed |