US4622915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developing head of electrophotographic system
Assignee: Fujifilm Holdings Corp
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Filing: 1984-12-06
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Granted: 1986-11-18
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Expires: 2004-12-06
Abstract
Abstract In a developing head of an electrophotographic system which develops an image by bringing a liquid developer into contact with a photosensitive face of electrophotographic material, through an opening provided in the developing head, a right angle is formed between the photosensitive face and the in-flow and out-flow route for the liquid developer and a gas for removing excess developer at the opening. A pressure-reducing chamber is formed between a frame around the opening and a frame surrounding the pressure-reducing chamber, both frames tightly contacting the electrophotosensitive material. Thus, the gap between the photosensitive face and a developing electrode is reduced and high speed for the gas for removing the developer is obtained. Liquid developer exuding from the frame around the opening is captured in the pressure-reducing chamber.
Inventors
- 👤 Shuichi Ohtsuka
- 👤 Akinori Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:09
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/10; G03G15/101
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
102 words
A developing head for a photosensitive face of electrophotosensitive material, in an electrophotographic system, comprising: means at said head for defining an opening including a first frame in front of said photosensitive face, means for supplying a liquid developer to said opening, means for supplying gas to said opening for removing liquid developer therefrom, said means for supplying said developer and said gas including a flow route perpendicular to the photosensitive face, a pressure-reducing chamber in said head adjacent said first frame, pressure-reducing means for evacuating said chamber, and a second frame around said pressure-reducing chamber for tightly contacting the photosensitive face.
Claim 2
Dependent Claim
102 words
A developing head for a photosensitive face of electrophotosensitive material, in an electrophotographic system, comprising: means at said head for defining an opening including a first frame in front of said photosensitive face, means for supplying a liquid developer to said opening, means for supplying gas to said opening for removing liquid developer therefrom, said means for supplying said developer and said gas including a flow route perpendicular to the photosensitive face, a pressure-reducing chamber in said head adjacent said first frame, pressure-reducing means for evacuating said chamber, and a second frame around said pressure-reducing chamber for tightly contacting the photosensitive face.
Claim 3
Dependent Claim
22 words
A developing head as claimed in claim 1, wherein said first frame is rectangular and forms an outer edge of said opening.
Claim 4
Dependent Claim
20 words
A developing head as claimed in claim 1, comprising trap means interposed between said pressure-reducing chamber and said pressure-reducing means.
Claim 5
Dependent Claim
26 words
A developing head as claimed in claim 1, wherein said supplying means for said developer comprises an auxiliary tank positioned at a level above said opening.
Claim 6
Dependent Claim
26 words
A developing head as claimed in claim 1, wherein said pressure-reducing means forms in said pressure-reducing chamber a pressure of over 100 mm H 2 O.
Claim 7
Dependent Claim
35 words
A developing head as claimed in claim 1, comprising an electrostatic charge chamber for charging said electrophotosensitive material, and said pressure-reducing chamber is disposed at a side of said opening facing said electrostatic charge chamber.
Claim 8
Dependent Claim
19 words
A developing head as claimed in claim 1, wherein said pressure-reducing chamber is rectangular and located below said opening.
Claim 9
Dependent Claim
21 words
A developing head as claimed in claim 1, wherein said pressure-reducing chamber is rectangular and surrounds said opening on all sides.
Claim 10
Dependent Claim
18 words
A developing head as claimed in claim 1, wherein said pressure-reducing chamber surrounds said opening on three sides.
Claim 11
Dependent Claim
23 words
A developing head as claimed in claim 1, wherein said pressure-reducing chamber has two partial chambers on two opposite sides of said opening.
References Cited (Backward Citations)
US3342164A
Cited
US3936854A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-11-17 | 1990-05-19 | 1990-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-17 | 1994-05-19 | 1994-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-17 | 1998-05-19 | 1998-11-18 | $7700.00 | Window Closed / Lapsed |