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Patent US3878324A successfully refreshed from Google Patents.
US3878324A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Smearing effect attenuator
Assignee: United States Department of the Navy
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Filing: 1974-04-01
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Granted: 1975-04-15
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Expires: 1994-04-01
Abstract
Abstract A device for enhancing video reception from a silicon target vidicon by reduction of smeared images. Conventional television scanning parameters are used to display images of the scene being viewed. Light rays from the scene are impinged upon a silicon target of photodiodes within the vidicon. A circuit is provided for grounding the target electrode between successive vertical scans of the electron beam thus reducing the time during which smearing of the image occurs.
Inventors
- 👤 Paul S Tubbs
- 👤 David R Flanders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:21
CPC Classifications
H; H04; H04N; H04N23/00; H04N23/80; H04N23/81
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
135 words
In a television camera system including a vidicon tube and horizontal and vertical drive circuits, the vertical drive circuit generating a signal having a first voltage level indicative of a vertical blanking interval and a second voltage level indicative of a vertical active scan time; wherein the improvement comprises. gating means receiving the vertical drive circuit signal for producing an output signal in phase with the vertical signal and having a firsT voltage level at substantially ground potential and a second voltage level of positive polarity; and terminal means electrically connected between the target of said vidicon tube and said gating means for receiving the output thereof; whereby said target is neutralized upon receipt of said gating means output signal first level and is activated upon receipt of said gating means output signal second level.
Claim 2
Dependent Claim
135 words
In a television camera system including a vidicon tube and horizontal and vertical drive circuits, the vertical drive circuit generating a signal having a first voltage level indicative of a vertical blanking interval and a second voltage level indicative of a vertical active scan time; wherein the improvement comprises. gating means receiving the vertical drive circuit signal for producing an output signal in phase with the vertical signal and having a firsT voltage level at substantially ground potential and a second voltage level of positive polarity; and terminal means electrically connected between the target of said vidicon tube and said gating means for receiving the output thereof; whereby said target is neutralized upon receipt of said gating means output signal first level and is activated upon receipt of said gating means output signal second level.
Claim 3
Dependent Claim
114 words
The improvement according to claim 1 wherein said gating means further comprises: amplifying means adapted to receive the vertical drive circuit signal and for producing an amplified output signal having first and second voltage levels in phase with the vertical drive circuit signal; clamping means connected to receive said amplifying means output signal for clamping the first voltage level thereof to a substantially ground potential and for producing an output signal having first and second levels in phase with the vertical drive circuit signal; and logic means connected to receive said clamping means output signal for changing the second voltage level thereof to a positive polarity and for producing said gating means output signal.
Claim 4
Dependent Claim
72 words
The improvement according to claim 2 wherein said amplifying means further comprises: a first transistor having a base operatively connected to receive the vertical drive circuit signal, an emitter operatively connected to ground and a collector for producing an output signal; and a second transistor having a base operatively connected to receive said first transistor output signal, and emitter connected to ground and a collector for producing said amplifying means output signal.
Claim 5
Dependent Claim
52 words
The improvement according to claim 3 wherein said clamping means further comprises: a capacitor connected to receive at one end the amplifying means output signal; and a diode having an anode connected to ground and a cathode connected to the other end of said capacitor for providing said clamping means output signal.
Claim 6
Dependent Claim
61 words
The improvement according to claim 4 wherein said logic means further comprises: a diode having a cathode connected to receive said clamping means output signal and an anode; and a resistor for receiving a positive voltage at one end and connected to the anode of said logic means second diode at the other end for producing said gating means output signal.
Claim 7
Dependent Claim
11 words
The improvement according to claim 1 wherein said target comprises photodiodes.
Claim 8
Dependent Claim
18 words
The improvement according to claim 3 wherein said amplifying means first and second transistors are of pnp type.
References Cited (Backward Citations)
SU196937A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |