US4206979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-optic modulator
Assignee: Grumman Corp
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Filing: 1978-06-27
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Granted: 1980-06-10
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Expires: 1998-06-27
Abstract
Abstract A multi-heterojunction of one type of photoconductive layer with another type of photoconductive layer to provide back-to-back modulators using illumination to decrease a potential barrier for current flow and increase voltage drop across an electro-optic device therewith associated in reproduction of an image thereby.
Inventors
- 👤 Steven R. Jost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:13
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/135; G02F1/1354; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
41 words
In a transmissive electro-optical element comprised of an electro-optic film between alignment layers and a photoconductive layer located between a pair of transparent electrodes, the improvement wherein the photoconductive layer includes multiple n-type CdS photoconductors with a p-type CdS:Cu photoconductor therebetween.
Claim 2
Dependent Claim
41 words
In a transmissive electro-optical element comprised of an electro-optic film between alignment layers and a photoconductive layer located between a pair of transparent electrodes, the improvement wherein the photoconductive layer includes multiple n-type CdS photoconductors with a p-type CdS:Cu photoconductor therebetween.
Claim 3
Dependent Claim
76 words
A transmissive incoherent to coherent image producer comprising: multiple heterojunction means including two n-type CdS photoconductor layers sandwiching a CdS:Cu photoconductor layer of p-type conductivity type; transparent conductive electrodes, one of which is directly connected to the multiple heterojunction means and another of which is spaced therefrom; electro-optic material in the space between the multiple heterojunction means and said another of said transparent conductive electrodes; and means to generate a signal connected across said transparent electrodes.
Claim 4
Dependent Claim
76 words
A transmissive incoherent to coherent image producer comprising: multiple heterojunction means including two n-type CdS photoconductor layers sandwiching a CdS:Cu photoconductor layer of p-type conductivity type; transparent conductive electrodes, one of which is directly connected to the multiple heterojunction means and another of which is spaced therefrom; electro-optic material in the space between the multiple heterojunction means and said another of said transparent conductive electrodes; and means to generate a signal connected across said transparent electrodes.
Claim 5
Independent Claim
113 words
A method of producing a light controlled AC electro-optic modulator, said method including the steps of manufacture of a multiple heterojunction comprising: depositing a first layer of CdS photoconductive material of P-type conductivity on a transparent electrode; heat treating said electrode with its deposited layer at a predetermined temperature to an inert atmosphere to crystallize said first layer of CdS; depositing a thin layer of copper on the first photoconductor material; depositing a second layer of CdS photoconductor material on said copper layer; and heat treating the aforesaid at a predetermined temperature in an inert atmosphere to make a multiple heterojunction structure of two n-type CdS layers sandwiching a layer of p-type CdS:Cu.
Claim 6
Independent Claim
113 words
A method of producing a light controlled AC electro-optic modulator, said method including the steps of manufacture of a multiple heterojunction comprising: depositing a first layer of CdS photoconductive material of P-type conductivity on a transparent electrode; heat treating said electrode with its deposited layer at a predetermined temperature to an inert atmosphere to crystallize said first layer of CdS; depositing a thin layer of copper on the first photoconductor material; depositing a second layer of CdS photoconductor material on said copper layer; and heat treating the aforesaid at a predetermined temperature in an inert atmosphere to make a multiple heterojunction structure of two n-type CdS layers sandwiching a layer of p-type CdS:Cu.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-06-10 | 1983-12-10 | 1984-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-10 | 1987-12-10 | 1988-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-10 | 1991-12-10 | 1992-06-10 | $7700.00 | Window Closed / Lapsed |