US4322734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable speed electrostatographic apparatus
Assignee: Ricoh Co Ltd
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Filing: 1979-11-08
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Granted: 1982-03-30
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Expires: 1999-11-08
Abstract
Abstract In an electrostatographic apparatus (11) such as a facsimile receiver, an electrical discharge electrode assembly (14) progressively forms an electrostatic image on an endless belt (12) as the belt (12) moves relative thereto. The belt (12) comprises a transparent substrate layer (12a) on which is formed a photoconductive layer (12b) and a dielectric layer (12c), with the electrostatic image being formed on the dielectric layer (12c). A lamp (26) illuminates the photoconductive layer (12b) to vary the conductivity thereof with an intensity according to the speed of movement of the belt (12).
Inventors
- 👤 Yutaka Ebi
- 👤 Tamio Ohori
- 👤 Fuyuhiko Matsumoto
- 👤 Satoru Tomita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:23
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/23; H04N1/29; H04N1/295
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
103 words
An electrostatographic apparatus comprising: a moving member having a variable conductivity layer and a dielectric layer; first means for forming an electrostatic image on the dielectric layer as the moving member moves adjacent to the first means; the first means comprising a plurality of electrodes and means for individually energizing the electrodes to produce electrical discharge from the electrodes; and second means for varying the conductivity of the variable conductivity layer in accordance with a speed of movement of the moving member; the variable conductivity layer being photoconductive, the second means comprising a variable intensity light source for illuminating the variable conductivity layer.
Claim 2
Dependent Claim
103 words
An electrostatographic apparatus comprising: a moving member having a variable conductivity layer and a dielectric layer; first means for forming an electrostatic image on the dielectric layer as the moving member moves adjacent to the first means; the first means comprising a plurality of electrodes and means for individually energizing the electrodes to produce electrical discharge from the electrodes; and second means for varying the conductivity of the variable conductivity layer in accordance with a speed of movement of the moving member; the variable conductivity layer being photoconductive, the second means comprising a variable intensity light source for illuminating the variable conductivity layer.
Claim 3
Dependent Claim
27 words
An apparatus as in claim 1, in which the second means is disposed upstream of the first means in a direction of movement of the moving member.
Claim 4
Dependent Claim
28 words
An apparatus as in claim 1, in which the first and second means are disposed at a same position in a direction of movement of the moving member.
Claim 5
Dependent Claim
25 words
An apparatus as in claim 1, in which the first and second means are disposed in such a manner that the moving member moves therebetween.
Claim 6
Dependent Claim
15 words
An apparatus as in claim 1, in which the moving member comprises an endless belt.
Claim 7
Dependent Claim
31 words
An apparatus as in claim 1, in which the moving member further comprises a conductive substrate layer, the variable conductivity layer being disposed between the substrate layer and the dielectric layer.
Claim 8
Dependent Claim
25 words
An apparatus as in claim 6, in which the substrate layer is transparent, the light source illuminating the variable conductivity layer through the substrate layer.
Claim 9
Dependent Claim
170 words
An electrostatographic apparatus comprising: a moving member having a variable conductivity layer and a dielectric layer, the variable conductivity layer being rendered conductive in accordance with an intensity of incident light radiation, the conductivity of the variable conductivity layer decreasing as a function of time after termination of light radiation; first means for forming an electrostatic image on the dielectric layer as the moving member moves adjacent to the first means; the first means comprising a plurality of electrodes and means for individually energizing the electrodes to produce electrical discharge from the electrodes; and second means for varying the conductivity of the variable conductivity layer in accordance with a speed of movement of the moving member; the second means comprising a fixed intensity light source for uniformly illuminating the variable conductivity layer and means for positioning the light source upstream of the first means in a direction of movement of the moving member at a distance from the first means corresponding to the speed of movement of the moving member.
Claim 10
Dependent Claim
170 words
An electrostatographic apparatus comprising: a moving member having a variable conductivity layer and a dielectric layer, the variable conductivity layer being rendered conductive in accordance with an intensity of incident light radiation, the conductivity of the variable conductivity layer decreasing as a function of time after termination of light radiation; first means for forming an electrostatic image on the dielectric layer as the moving member moves adjacent to the first means; the first means comprising a plurality of electrodes and means for individually energizing the electrodes to produce electrical discharge from the electrodes; and second means for varying the conductivity of the variable conductivity layer in accordance with a speed of movement of the moving member; the second means comprising a fixed intensity light source for uniformly illuminating the variable conductivity layer and means for positioning the light source upstream of the first means in a direction of movement of the moving member at a distance from the first means corresponding to the speed of movement of the moving member.
Claim 11
Dependent Claim
31 words
An apparatus as in claim 8, in which the means for positioning the light source is constructed to increase said distance as the speed of movement of the moving member decreases.
Claim 12
Dependent Claim
48 words
An apparatus as in claim 8, in which the moving member further comprises a conductive substrate layer, the variable conductivity layer being disposed between the substrate layer and the dielectric layer, the substrate layer being transparent, the light source illuminating the variable conductivity layer through the substrate layer.
Claim 13
Dependent Claim
60 words
An electrostatographic apparatus comprising: a moving member having a variable conductivity layer and a dielectric layer; first means for forming an electrostatic image on the dielectric layer as the moving member moves adjacent to the first means; and second means for varying the conductivity of the variable conductivity layer in accordance with a speed of movement of the moving member.
Claim 14
Dependent Claim
60 words
An electrostatographic apparatus comprising: a moving member having a variable conductivity layer and a dielectric layer; first means for forming an electrostatic image on the dielectric layer as the moving member moves adjacent to the first means; and second means for varying the conductivity of the variable conductivity layer in accordance with a speed of movement of the moving member.
Claim 15
Dependent Claim
28 words
An apparatus as in claim 11, in which the conductivity of the variable conductivity layer varies in accordance with temperature, the second means comprising variable temperature heater means.
Claim 16
Dependent Claim
32 words
An apparatus as in claim 12, in which the variable temperature heater means comprises an electrical heater, a power source and a variable resistor connected between the power source and the heater.
Claim 17
Dependent Claim
23 words
An apparatus as in claim 12, further comprising a roller which contacts the moving member, the heater means being disposed in the roller.
Claim 18
Dependent Claim
37 words
An apparatus as in claim 11, in which the conductivity of the variable conductivity layer varies in accordance with pressure, the second means comprising first and second rollers for nipping the moving member therebetween with variable pressure.
Claim 19
Dependent Claim
37 words
An apparatus as in claim 11, 12, 13, 14 or 15, in which the second means is constructed to increase the conductivity of the variable conductivity layer as the speed of movement of the moving member increases.
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) | 1985-03-29 | 1985-09-28 | 1986-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-29 | 1989-09-28 | 1990-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-29 | 1993-09-28 | 1994-03-30 | $7700.00 | Window Closed / Lapsed |