Patent US4843427A successfully refreshed from Google Patents.
US4843427A
Expired / Lapsed
US
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Selective charge removal system for copier
Assignee: Sharp Corp
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Filing: 1988-01-05
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Granted: 1989-06-27
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Expires: 2008-01-05
Abstract
Abstract A selective charge removal system for a copier uses a transparent electrochromic display with many segments or dots thereon and a back-lighting unit such that only a specified area which is precisely defined on the photosensitive body of the copier is exposed to the light from the back-lighting unit. These segments or dots are driven to an intermediate color state during a wait period before a copying operation of the copier is started such that the color conditions of the electrochromic display can be changed quickly.
Inventors
- 👤 Yoshiaki Ibuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:36
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/04; G03G15/045; G03G15/047
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
171 words
In a selective charge removal system for a copier, said copier comprising a photosensitive body, charging means for charging said photosensitive body, developing means for developing an image on said photosensitive body, light-emitting means disposed between said charging means and said developing means for selectively removing charge either from an electrostatic latent image formed on said photosensitive body or from a specified area on said photosensitive body for forming an electrostatic latent image thereon, and control means for controlling the operation of said light-emitting means, the improvement wherein said light-emitting means comprise a transparent electrochromic display having a plurality of segments or dots arranged thereon, and a back-lighting unit, said control means including driving means for driving each of said segments or dots into an intermediate color condition during a wait period prior to a copying operation of said copier, said intermediate color condition being a state between the colored and colorless states of said segments or dots, whereby the display conditions of said electrochromic display can be changed more quickly.
Claim 2
Dependent Claim
171 words
In a selective charge removal system for a copier, said copier comprising a photosensitive body, charging means for charging said photosensitive body, developing means for developing an image on said photosensitive body, light-emitting means disposed between said charging means and said developing means for selectively removing charge either from an electrostatic latent image formed on said photosensitive body or from a specified area on said photosensitive body for forming an electrostatic latent image thereon, and control means for controlling the operation of said light-emitting means, the improvement wherein said light-emitting means comprise a transparent electrochromic display having a plurality of segments or dots arranged thereon, and a back-lighting unit, said control means including driving means for driving each of said segments or dots into an intermediate color condition during a wait period prior to a copying operation of said copier, said intermediate color condition being a state between the colored and colorless states of said segments or dots, whereby the display conditions of said electrochromic display can be changed more quickly.
Claim 3
Dependent Claim
19 words
The system of claim 1 wherein said electrochromic display is disposed between said back-lighting unit and said photosensitive body.
Claim 4
Dependent Claim
73 words
The system of claim 1 wherein said electrochromic display comprises a first transparent plate and a second transparent plate disposed in a mutually parallel relationship with respect to each other, said segments or said dots being disposed on said first transparent plate, a transparent electrode being disposed on said second transparent plate said first transparent plate being covered with an electrochromic material, and said first and second transparent plates sandwiching an electrolyte therebetween.
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) | 1992-06-26 | 1992-12-26 | 1993-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-26 | 1996-12-26 | 1997-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-26 | 2000-12-26 | 2001-06-27 | $7700.00 | Window Closed / Lapsed |