Patent US4816871A successfully refreshed from Google Patents.
US4816871A
Expired / Lapsed
US
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Charging control apparatus for image carrier
Assignee: Toshiba Corp
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Filing: 1987-12-02
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Granted: 1989-03-28
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Expires: 2007-12-02
Abstract
Abstract An image carrier carries an electrostatic latent image. A charger charges the image carrier to carry the electrostatic latent image. A high-voltage source supplies a high-voltage output to the charger for charging. A temperature detector detects the temperature of the image carrier. A charging controller outputs a control signal for regulating the high-voltage output of the high-voltage source in response to the temperature detection signal from the temperature detector. The control signal has the ability to compensate for changes in the charging of the image carrier by controlling the high-voltage output of the high-voltage source, in accordance with changes in temperature of the image carrier.
Inventors
- 👤 Hideshi Oushiden
- 👤 Hiroshi Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:02
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0266
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
153 words
A charging control apparatus for an image carrier, comprising: an image carrier for carrying an electrostatic latent image; a charger for charging said image carrier to carry the electrostatic latent image; a high-voltage source for supplying a high-voltage output to said charger; a temperature detection means for detecting the temperature of said image carrier; and charging control means for outputting a control signal which regulates the high-voltage output from said high-voltage source in response to a temperature detection signal of said temperature detection means, the control signal having the ability to compensate for changes in the charging from said image carrier by controlling the high-voltage output of said high-voltage source, in accordance with changes in temperature of said image carrier; the control signal having a characteristic curve ascending substantially linearly within a predetermined temperature range, the signal being held at predetermined levels at lower and higher temperatures falling outside the predetermined temperature range.
Claim 2
Dependent Claim
153 words
A charging control apparatus for an image carrier, comprising: an image carrier for carrying an electrostatic latent image; a charger for charging said image carrier to carry the electrostatic latent image; a high-voltage source for supplying a high-voltage output to said charger; a temperature detection means for detecting the temperature of said image carrier; and charging control means for outputting a control signal which regulates the high-voltage output from said high-voltage source in response to a temperature detection signal of said temperature detection means, the control signal having the ability to compensate for changes in the charging from said image carrier by controlling the high-voltage output of said high-voltage source, in accordance with changes in temperature of said image carrier; the control signal having a characteristic curve ascending substantially linearly within a predetermined temperature range, the signal being held at predetermined levels at lower and higher temperatures falling outside the predetermined temperature range.
Claim 3
Dependent Claim
20 words
An apparatus according to claim 1, wherein a lower limit value of the predetermined temperature range is about 30° C.
Claim 4
Dependent Claim
20 words
An apparatus according to claim 1, wherein an upper limit value of the predetermined temperature range is about 42° C.
Claim 5
Dependent Claim
20 words
An apparatus according to claim 1, wherein said temperature detection means comprises a thermistor, arranged near said image of carrier.
Claim 6
Dependent Claim
79 words
An apparatus according to claim 1, wherein said charging control means comprises a first operational amplifier, providing an output voltage corresponding to a temperature detection signal from said temperature detection means within the predetermined temperature range, second and third operational amplifiers for providing output voltages to be held at first and second predetermined levels respectively at lower and higher temperatures falling outside the predetermined temperature range, and means for determining operating points of said second and third operational amplifiers.
Claim 7
Dependent Claim
23 words
An apparatus according to claim 5, wherein said charging control means includes means for adjusting gains of said first to third operational amplifiers.
Claim 8
Dependent Claim
27 words
An apparatus according to claim 1, wherein said charging control means controls a current value at a high-voltage output from said high-voltage source, using the control signal.
Claim 9
Dependent Claim
51 words
An apparatus according to claim 1, wherein said apparatus further comprises main control means for controlling the control signal supplied from said charging control means in accordance with a high-speed mode for an image formation of an equal magnification and a low-speed mode for an image formation of a variable magnification.
Claim 10
Dependent Claim
20 words
An apparatus according to claim 8, wherein said main control means further controls an ON/OFF operation of said high-voltage source.
Claim 11
Dependent Claim
99 words
A charging control apparatus for an image carrier, comprising: an image carrier for carrying an electrostatic latent image; a charger for charging said image carrier to carry the electrostatic latent image; source means for supplying a charging voltage to said charger; temperature detection means for detecting the temperature of said image carrier; and charging control means for outputting a control signal which regulates the charging voltage supplied from said source means in response to a temperature detection signal detected by said temperature detection means, the control signal having a characteristic curve ascending substantially linearly within a predetermined temperature range.
Claim 12
Dependent Claim
99 words
A charging control apparatus for an image carrier, comprising: an image carrier for carrying an electrostatic latent image; a charger for charging said image carrier to carry the electrostatic latent image; source means for supplying a charging voltage to said charger; temperature detection means for detecting the temperature of said image carrier; and charging control means for outputting a control signal which regulates the charging voltage supplied from said source means in response to a temperature detection signal detected by said temperature detection means, the control signal having a characteristic curve ascending substantially linearly within a predetermined temperature range.
References Cited (Backward Citations)
US3805069A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-27 | 1992-09-26 | 1993-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-27 | 1996-09-26 | 1997-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-27 | 2000-09-26 | 2001-03-28 | $7700.00 | Window Closed / Lapsed |