US4554571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Matched photonic detector-charge transfer reader assembly and image forming target using such an assembly
Assignee: Thales SA
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Filing: 1982-06-17
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Granted: 1985-11-19
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Expires: 2002-06-17
Abstract
Abstract A photovoltaic diode input, and a charge transfer readout device are coupled by a MOS stage. The coupling stage includes a MOS transistor, to which is added, close to the source electrode of the MOS transistor which receives the signal from the diode, an extra electrode under which are stored charges which flow at the same time as those of the signal toward the readout device. Thus, the current involved is increased and the efficiency of signal injection into the readout device is improved.
Inventors
- 👤 Marc Arques
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:21
CPC Classifications
H; H10; H10F; H10F39/00; H10F39/10; H10F39/12; H10F39/15; H10F39/157; H10F39/1575; H10D; H10D44/00; H10D44/40; H10D44/45; H10D44/452
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
150 words
In a photon detector-charge transfer readout device assembly comprising at least one photon detector exposed to incident radiation and a readout device for reading a signal from this detector, transfer charges created in the readout device being of the same sign to those of the signal of the detector, detector and said readout device being connected together by way of a MOS field effect transister having a source, an auxiliary electrode, a control gate, a drain-forming electrode and a transfer gate, said MOS transistor being integrated with the readout device, the signals from the detector being transmitted to the readout device by sequential switching of the potentials of the electrodes of the transister, said auxiliary electrode being adjacent the source for accumulating thereunder in said substrate during operation a fixed reserve charge, and means for applying a steadily decreasing potential in time to this additional electrode during a switching cycle.
Claim 2
Dependent Claim
150 words
In a photon detector-charge transfer readout device assembly comprising at least one photon detector exposed to incident radiation and a readout device for reading a signal from this detector, transfer charges created in the readout device being of the same sign to those of the signal of the detector, detector and said readout device being connected together by way of a MOS field effect transister having a source, an auxiliary electrode, a control gate, a drain-forming electrode and a transfer gate, said MOS transistor being integrated with the readout device, the signals from the detector being transmitted to the readout device by sequential switching of the potentials of the electrodes of the transister, said auxiliary electrode being adjacent the source for accumulating thereunder in said substrate during operation a fixed reserve charge, and means for applying a steadily decreasing potential in time to this additional electrode during a switching cycle.
Claim 3
Dependent Claim
69 words
The assembly as claimed in claim 1, comprising at least two such detectors and two such transistors whose electrodes are controlled by the same potentials, further comprising means for accumulating under the electrode forming drain of each transistor, at the time when the assembly is brought into operation, another charge quantity compensating for the inequality of potentials in the substrate under the transfer gate brought to the same potential.
Claim 4
Dependent Claim
14 words
The assembly as claimed in claim 1 wherein said detector is a photovoltaic diode.
Claim 5
Dependent Claim
19 words
The assembly as claimed in claim 1, wherein the potential applied to said additional electrode decreases linearly in time.
Claim 6
Dependent Claim
12 words
The assembly of claim 1 for use in an image forming target.
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) | 1988-11-18 | 1989-05-20 | 1989-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-18 | 1993-05-20 | 1993-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-18 | 1997-05-20 | 1997-11-19 | $7700.00 | Window Closed / Lapsed |