US4196458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic flashlight apparatus
Assignee: Olympus Corp
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Filing: 1978-07-17
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Granted: 1980-04-01
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Expires: 1998-07-17
Abstract
Abstract A flashlight apparatus includes a power switch, formed by a changeover switch, which is connected in a path to discharge a primary discharge capacitor and a trigger capacitor in its off condition to disable a flashlight operation. Simultaneously, a neon tube light which indicates the completion of charging of the primary discharge capacitor is turned off, indicating the off position of the power switch.
Inventors
- 👤 Isao Kondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:28
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/30; H05B41/32
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
121 words
In a photographic flashlight apparatus including a flash discharge tube, a primary capacitor connected across the flash discharge tube, a charging complete indicator circuit includng a lamp for indicating the completion of charging of the primary capacitor, and a trigger circuit including a trigger capacitor associated with the discharge tube; the improvement which comprises a power switch in the form of a single pole, double throw switch which connects a power source with or disconnects it from ground, and means connecting an off contact of the power switch with a junction between the charging complete indicator circuit and the trigger circuit, said means short-circuiting the lamp in the indicator circuit and the trigger capacitor when the power switch is turned off.
Claim 2
Dependent Claim
121 words
In a photographic flashlight apparatus including a flash discharge tube, a primary capacitor connected across the flash discharge tube, a charging complete indicator circuit includng a lamp for indicating the completion of charging of the primary capacitor, and a trigger circuit including a trigger capacitor associated with the discharge tube; the improvement which comprises a power switch in the form of a single pole, double throw switch which connects a power source with or disconnects it from ground, and means connecting an off contact of the power switch with a junction between the charging complete indicator circuit and the trigger circuit, said means short-circuiting the lamp in the indicator circuit and the trigger capacitor when the power switch is turned off.
Claim 3
Dependent Claim
39 words
The apparatus according to claim 1 in which the single pole, double throw switch includes a movable contact which is connected with the ground and an on contact which is connected with the positive terminal of the power source.
Claim 4
Dependent Claim
110 words
The apparatus according to claim 1 in which said short-circuiting means comprises a first series circuit including a diode and a resistor, and wherein the charging complete indicator circuit includes a resistor in series with the lamp and the trigger circuit comprises a series combination of a resistor, the trigger capacitor and a trigger transformer, said first series circuit being connected between the junction between the resistor and the lamp of the indicator circuit and the junction between the resistor and the capacitor of the trigger circuit, the junction between the diode and the resistor of said first series circuit being connected with the off contact of the power switch.
Claim 5
Dependent Claim
72 words
The apparatus according to claim 1 in which the charging complete indicator circuit includes a resistor in series with the lamp, and the trigger circuit comprises another resistor, the trigger capacitor and a trigger transformer connected in series, said short-circuiting means coupling the junction between the resistor and the lamp of the indicator circuit with said another resistor of the trigger circuit and also with the off contact of the power switch.
References Cited (Backward Citations)
US3745896A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-01 | 1983-10-01 | 1984-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-01 | 1987-10-01 | 1988-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-01 | 1991-10-01 | 1992-04-01 | $7700.00 | Window Closed / Lapsed |