US5410225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Video camera and camera system employing aperture control
Assignee: Sony Group Corp
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Filing: 1992-08-24
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Granted: 1995-04-25
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Expires: 2012-08-24
Abstract
Abstract In a video camera in strobe mode, when a condition for strobe light emission is ready, the aperture of an iris is reduced and the gain of an AGC amplifier is fixed at a predetermined value. Accordingly, a dark image representing the condition ready for strobe light emission is displayed on an electronic view finder, and in addition saturation of charge accumulation is prevented.
Inventors
- 👤 Satoshi Ishii
- 👤 Hiroyuki Hashimoto
- 👤 Haruo Saitoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:14
CPC Classifications
G; G03; G03B; G03B15/00; G03B15/02; G03B15/03; H; H04; H04N; H04N23/00; H04N23/70; H04N23/71; H04N23/72; H04N23/80; H04N23/84; H04N23/88
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
122 words
A video camera comprising: an iris having an aperture, said iris for controlling an amount of incident light on an image pick-up device; an Auto-Gain-Control amplifier for controlling the level of a picked-up image signal outputted from said image pick-up device; mode setting means for setting a light emission mode in which a light emission means is used; voltage detection means for detecting a charge voltage of said light emission means; and control means for reducing said aperture of said iris and fixing the gain of said Auto-Gain-Control amplifier at a predetermined value when a condition of said charge voltage exceeding a threshold value is detected by said voltage detection means when said mode setting means has set said light emission mode.
Claim 2
Dependent Claim
122 words
A video camera comprising: an iris having an aperture, said iris for controlling an amount of incident light on an image pick-up device; an Auto-Gain-Control amplifier for controlling the level of a picked-up image signal outputted from said image pick-up device; mode setting means for setting a light emission mode in which a light emission means is used; voltage detection means for detecting a charge voltage of said light emission means; and control means for reducing said aperture of said iris and fixing the gain of said Auto-Gain-Control amplifier at a predetermined value when a condition of said charge voltage exceeding a threshold value is detected by said voltage detection means when said mode setting means has set said light emission mode.
Claim 3
Dependent Claim
50 words
A video camera according to claim 1, wherein said control means timely outputs a take-in pulse in accordance with output of a frame of said picked-up image signal from said image pick-up device when said picked up image signal is picked up with light emission of said light emission means.
Claim 4
Dependent Claim
15 words
A video camera according to claim 1, wherein said light emission means is a strobe.
Claim 5
Dependent Claim
36 words
A video camera according to claim 1, wherein said light emission means effects light emission in response to operation of a shutter switch when the charge voltage of said light emission means exceeds a threshold value.
Claim 6
Dependent Claim
31 words
A video camera according to claim 2, wherein said take-in pulse is used as a timing signal for latching said frame of said image picked-up signal into a still image recorder.
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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) | 1998-04-24 | 1998-10-24 | 1999-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-04-24 | 2002-10-24 | 2003-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-04-24 | 2006-10-24 | 2007-04-25 | $7700.00 | Window Closed / Lapsed |