GB1460538A - Apparatus for 0ntrolling exposure in electrophotographic printing machines - Google Patents
Apparatus for 0ntrolling exposure in electrophotographic printing machinesInfo
- Publication number
- GB1460538A GB1460538A GB3639374A GB3639374A GB1460538A GB 1460538 A GB1460538 A GB 1460538A GB 3639374 A GB3639374 A GB 3639374A GB 3639374 A GB3639374 A GB 3639374A GB 1460538 A GB1460538 A GB 1460538A
- Authority
- GB
- United Kingdom
- Prior art keywords
- exposure
- toner particles
- aug
- varying
- original
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
- G03G15/0848—Arrangements for testing or measuring developer properties or quality, e.g. charge, size, flowability
- G03G15/0849—Detection or control means for the developer concentration
- G03G15/0855—Detection or control means for the developer concentration the concentration being measured by optical means
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/50—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control
- G03G15/5033—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control by measuring the photoconductor characteristics, e.g. temperature, or the characteristics of an image on the photoconductor
- G03G15/5041—Detecting a toner image, e.g. density, toner coverage, using a test patch
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Or Security For Electrophotography (AREA)
Abstract
1460538 Automatic exposure control XEROX CORP 19 Aug 1974 [27 Aug 1973] 36393/74 Headings G2A G2H and G3R In a xerographic copying machine using a developer comprising toner particles and carrier particles, the exposure of the photo-conductive drum to the light image of an original is controlled in response to an error signal representing the difference between a reference signal and a signal corresponding to the detected optical density of toner particles deposited on a transparent electrode positioned in a non-image area of the photoconductive drum. The exposure may be controlled by varying the voltage of the power supply to the lamps illuminating the original, or by varying the width of a slit through which the light rays are passed. The error signal may also be used to dispense toner particles into the developer mix.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US39189673A | 1973-08-27 | 1973-08-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1460538A true GB1460538A (en) | 1977-01-06 |
Family
ID=23548408
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3639374A Expired GB1460538A (en) | 1973-08-27 | 1974-08-19 | Apparatus for 0ntrolling exposure in electrophotographic printing machines |
Country Status (3)
Country | Link |
---|---|
CA (1) | CA1012601A (en) |
GB (1) | GB1460538A (en) |
NL (1) | NL7407225A (en) |
-
1974
- 1974-04-29 CA CA198,404A patent/CA1012601A/en not_active Expired
- 1974-05-29 NL NL7407225A patent/NL7407225A/xx not_active Application Discontinuation
- 1974-08-19 GB GB3639374A patent/GB1460538A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
NL7407225A (en) | 1974-09-25 |
CA1012601A (en) | 1977-06-21 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
746 | Register noted 'licences of right' (sect. 46/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |