Patent US3789216A successfully refreshed from Google Patents.
US3789216A
Expired / Lapsed
US
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Photodetection device and method comprising phthalocyanine
Assignee: Xerox Corp
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Filing: 1973-01-02
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Granted: 1974-01-29
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Expires: 1993-01-02
Abstract
Abstract Photoelectric device comprising a pair of electrodes, at least one of which is transparent, and sandwiched therebetween an interlayer containing a phthalocyanine pigment dispersed in an organic film forming polymeric binder. During operation of this device a biasing potential is applied across these electrodes and the interlayer irradiated through the transparent electrode which serves as a window for this photoelectric device. Because of the very high photosensitivity and rapid response times of this inter-layer, this device is suitable for use in detection of relatively low intensity incident or reflected light of short impulse duration. This sensitivity and spectral response to light in the red band of the visible spectrum makes such a device ideally suited for use in conjunction with red laser scanners.
Inventors
- 👤 R Komp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:25
CPC Classifications
H; H10; H10K; H10K85/00; H10K85/30; H10K85/311; H10K30/00; H10K30/451; H10K30/50; Y; Y02; Y02E; Y02E10/00; Y02E10/50; Y02E10/549
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
21 words
The photoelectric device of claim 1, wherein the weight ratio of pigment to binder ranges from about 1:1 to about 1:6.
Claim 2
Dependent Claim
26 words
The photoelectric device of claim 1, wherein the binder gap between adjacent pigment particles is in the range of from about 10 to about 100 A.
Claim 3
Dependent Claim
34 words
The photoelectric device of claim 1, wherein the pigment is selected from a group consisting of metal free phthalocyanine, the X-form of metal containing phthalocyanine, the X-form of metal free phthalocyanine, and mixtures thereof.
Claim 4
Dependent Claim
22 words
The photoelectric device of claim 1, wherein the photo-conductive layer has an average thickness of from about 0.2 to about 200 microns.
Claim 5
Dependent Claim
22 words
The photoelectric device of claim 1, wherein the photoconductive layer has an average film thickness of about 5 to about 30 microns.
Claim 6
Independent Claim
221 words
A method for monitoring changes in intensity in incident or reflected emissions from red lasers, the method comprising: a. providing a photoelectric device having (1) a photoresponsive element comprising a photoconductive layer sandwiched between two electrically conductive plates, at least one of said plates being substantially transparent and substantially nonabsorptive of incident or reflected light in the red and near infrared band of the visible spectrum, (2) an energizing power source electrically connected to the plates of the photoresponsive element so as to effect a biasing potential across said element, the relative polarity of plate being such as to provide a positive bias on the transparent plate through which said photoconductive layer is to be illuminated, and (3) an electrometer electrically connected to the photoresponsive element so as to enable monitoring of the flow of current through the photoconductive layer of said element, and b. maintaining a bias potential on the plates of the photoresponsive element in the range of from about 0.1 to about 100 volts per micron thickness of the photoconductive layer while monitoring for red laser emissions. the photoconductive layer of said photoresponsive element comprising a substantially homogenous particulate dispersion of phtHalocyanine pigment in a film forming organic polymeric binder, the relative weight ratio of pigment to binder being in the range of about 3:1 to about 1:30.
Claim 7
Dependent Claim
34 words
The method of claim 7, wherein the bias potential on the plates of the photoresponsive element is in the range from about 1 ''to about 10 volts per micron thickness of the photoconductive layer.
Claim 8
Dependent Claim
20 words
The method of claim 7, wherein the weight ratio of pigment to binder ranges from about 1:1 to about 1:6.
Claim 9
Dependent Claim
25 words
The method of claim 7, wherein the binder gap between adjacent pigment particles is in the range of from about 10 to about 100 A.
Claim 10
Dependent Claim
33 words
The method of claim 7, wherein the pigment is selected from a group consisting of metal free phthalocyanine, the X-form of metal containing phthalocyanine, the X-form of metal free phthalocyanine, and mixtures thereof.
Claim 11
Dependent Claim
21 words
The method of claim 7, wherein the photoconductive layer has an average thickness of from about 0.2 to about 200 microns.
Claim 12
Dependent Claim
21 words
The method of claim 7, wherein the photoconductive layer has an average film thickness of about 5 to about 30 microns.
References Cited (Backward Citations)
US2069505A
Cited
US3672979A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |