US4271375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flash light discharge device
Assignee: Fujinon Corp
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Filing: 1979-07-02
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Granted: 1981-06-02
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Expires: 1999-07-02
Abstract
Abstract In a flash light discharge device including a strobo tube attached to a camera body, both the positive and negative outputs of a blocking oscillator are made use of. One output is used for charging a main capacitor for making the strobo tube discharged, and the other output is used for energizing an indicator or indicators. Both the outputs may be used for charging the main capacitor to accelerate the charging of the capacitor. The indicator energized by the output of the blocking oscillator while the main capacitor is charged may be an indicator which indicates by intermittent lighting that the main capacitor is being charged.
Inventors
- 👤 Tsutomu Hosono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:50
CPC Classifications
G; G03; G03B; G03B15/00; G03B15/02; G03B15/03; G03B15/05; H; H05; H05B; H05B41/00; H05B41/14; H05B41/30; H05B41/32; G03B2215/00; G03B2215/05; G03B2215/0503
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A flash discharge device comprising: a blocking oscillator; a first rectifier connected to said blocking oscillator to receive output signals therefrom and polarized to rectify output signals in one polarity; a strobe circuit connected to said first rectifier and comprising a strobe tube and a main capacitor connected thereto to store electric charge supplied through said first rectifier to operate said strobe tube; a second rectifier connected to the output of said blocking oscillator to receive output signals therefrom and polarized oppositely from said first rectifier to rectify in the opposite polarity said blocking oscillator output signals applied to said second rectifier; and voltage indicating means for indicating that said main capacitor is being charged connected to said second rectifier to be energized by the oppositely polarized rectified signals therefrom.
Claim 2
Dependent Claim
130 words
A flash discharge device comprising: a blocking oscillator; a first rectifier connected to said blocking oscillator to receive output signals therefrom and polarized to rectify output signals in one polarity; a strobe circuit connected to said first rectifier and comprising a strobe tube and a main capacitor connected thereto to store electric charge supplied through said first rectifier to operate said strobe tube; a second rectifier connected to the output of said blocking oscillator to receive output signals therefrom and polarized oppositely from said first rectifier to rectify in the opposite polarity said blocking oscillator output signals applied to said second rectifier; and voltage indicating means for indicating that said main capacitor is being charged connected to said second rectifier to be energized by the oppositely polarized rectified signals therefrom.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-01 | 1984-12-01 | 1985-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-01 | 1988-12-01 | 1989-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-01 | 1992-12-01 | 1993-06-02 | $7700.00 | Window Closed / Lapsed |