Patent US3673595A successfully refreshed from Google Patents.
US3673595A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for electrostatic image-forming and processes for use therewith
Assignee: Canon Inc
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Filing: 1969-02-20
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Granted: 1972-06-27
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Expires: 1989-02-20
Abstract
Abstract An electron beam tube for use in formation and recordation of electrostatic charge patterns has a face plate including a photoconductive layer and a conductive base which is transmissive to electron beams and is disposed intermediate the photoconductive layer and the tube electron beam emitter. Processes for forming electrostatic charge patterns in such face plate include the steps of placing an insulative charge-retaining layer in contact with the photoconductive layer, the insulative layer either being previously charged or being charged while in position on the photoconductive layer, and applying a voltage to the face plate and simultaneously irradiating the photoconductive layer with pattern-indicating electron beams. Electrostatic charge patterns thus-formed in the insulative layer may be developed in place or transferred and subsequently developed.
Inventors
- 👤 Eiichi Inoue
- 👤 Keizo Yamaji
- 👤 Hiroshi Tanaka
- 👤 Takashi Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:17
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/02; H01J31/06; H01J31/065; G; G03; G03G; G03G15/00; G03G15/22; G03G15/32; G03G15/321; G03G5/00; G03G5/02; G03G5/04; B; B29; B29C; B29C65/00; B29C65/78; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
23 words
applying to said plate means a field tending to eliminate said first polarity potential, thereby forming said electrostatic image in said insulative member.
Claim 2
Dependent Claim
27 words
The apparatus claimed in claim 1 including further means for applying to said photoconductive layer blanket radiation within the range of radiation sensitivity of said photoconductive layer.
Claim 3
Dependent Claim
20 words
The apparatuS claimed in claim 1 wherein said photoconductive layer is a dispersion including cadmium sulfide and a binder material.
Claim 4
Dependent Claim
20 words
The apparatus claimed in claim 1 wherein said photoconductive layer is a dispersion including zinc oxide and a binder material.
Claim 5
Dependent Claim
13 words
The apparatus claimed in claim 1 wherein said photoconductive layer includes chalcogenide compounds.
Claim 6
Dependent Claim
15 words
The apparatus claimed in claim 1 including further an insulative member overlying said photoconductive layer.
Claim 7
Dependent Claim
27 words
The apparatus claimed in claim 6 including further means for applying to said photoconductive layer blanket radiation within the range of radiation sensitivity of said photoconductive layer.
Claim 8
Dependent Claim
25 words
The apparatus claimed in claim 7 wherein said insulative member is non-transparent to said radiation within the range of radiation sensitivity of said photoconductive layer.
Claim 9
Dependent Claim
97 words
A process for forming an electrostatic image by using apparatus comprising means operably responsive to information signals for emitting electron beams defining said image and plate means including a photoconductive layer and an electron beam transmissive conductive base underlying said photoconductive layer, said base intervening said electron beam emitting means and said photoconductive layer, said electron beams rendering said photoconductive layer selectively conductive in accordance with said image, said process comprising the steps of: a. overlaying an insulative member on said photoconductive layer; b. maintaining a potential of a first polarity across said plate means; and c.
Claim 10
Dependent Claim
32 words
The process claimed in claim 9 further including a terminal step of removing said insulative member from said photoconductive layer, thereby increasing the contrast of said image formed in said insulative member.
Claim 11
Dependent Claim
35 words
The process claimed in claim 9 wherein said step of maintaining said potential of said first polarity across said plate means is practiced by applying charge of said first polarity to said overlying insulative member.
Claim 12
Dependent Claim
49 words
The process claimed in claim 9 wherein said step of maintaining said potential of said first polarity across said plate means is practiced by applying charge of said first polarity to said insulative member prior to practice of said step of overlaying said insulative member on said photoconductive layer.
Claim 13
Dependent Claim
41 words
The process claimed in claim 9 wherein said step of applying to said plate means a field tending to eliminate said first polarity potential is practiced by applying to said plate means a potential of polarity opposite to said first polarity.
Claim 14
Dependent Claim
36 words
The process claimed in claim 9 wherein said step of applying to said plate means a field tending to eliminate said first polarity potential is practiced by applying alternating current corona discharge to said plate means.
Claim 15
Dependent Claim
19 words
The process claimed in claim 9 wherein said photoconductive layer exhibits p-type semiconductivity and said first polarity is negative.
Claim 16
Dependent Claim
19 words
The process claimed in claim 9 wherein said photoconductive layer exhibits n-type semiconductivity and said first polarity is positive.
Claim 17
Dependent Claim
21 words
The process claimed in claim 9 wherein a surface lubricant is interposed between said overlying insulative member and the surface therebelow.
Claim 18
Dependent Claim
31 words
The process claimed in claim 9 including the further step of providing an insulative layer on a surface of said photoconductive layer prior to overlaying said insulative member on said surface.
Claim 19
Dependent Claim
21 words
The process claimed in claim 18 wherein a surface lubricant is interposed between said overlying insulative member and the surface therebelow.
Claim 20
Dependent Claim
39 words
The process claimed in claim 9 including the terminal step of applying to said photoconductive layer blanket radiation within the range of sensitivity of said photoconductive layer, thereby increasing the contrast of said image formed in said insulative member.
Claim 21
Dependent Claim
19 words
The process claimed in claim 20 including the further step of transferring said electrostatic image to a copying member.
Claim 22
Dependent Claim
20 words
The process claimed in claim 21 including the further step of visualizing said transferred electrostatic image on said copying member.
Claim 23
Dependent Claim
19 words
The process claimed in claim 22 including the further step of fixing said visualized image on said copying member.
Claim 24
Dependent Claim
19 words
The process claimed in claim 20 including the further step of visualizing said electrostatic image on said insulative member.
Claim 25
Dependent Claim
19 words
The process claimed in claim 24 including the further step of transferring said visualized image to a copying member.
Claim 26
Dependent Claim
20 words
The process claimed in claim 25 including the further step of fixing said transferred visualized image on said copying member.
Claim 27
Dependent Claim
19 words
The process claimed in claim 24 including the further step of fixing said visualized image on said insulative member.
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |