Title:
【発明の名称】デジタル画像形成装置
Document Type and Number:
Japanese Patent JP3021538
Kind Code:
B2
Abstract:
In an electrophotographic image forming apparatus wherein raster scan of a laser beam is carried out to expose the sensitized photoconductor and the gradation is expressed with intensity modulation method, the duration of the light-emitting time for forming a dot is made smaller than the whole period needed for scanning a region assigned for a dot, while the maximum light intensity is changed according to a ratio of the duration of the light-emitting time to the whole period. Further, a plurality of modes each having a duty ratio different from each other may be provided and the maximum light intensity is changed according to the duty ratio so that the mean quantity of light for a dot is equal to each other.
Inventors:
Kazuyuki Fukui
Takanobu Yamada
Takanobu Yamada
Application Number:
JP11597690A
Publication Date:
March 15, 2000
Filing Date:
May 02, 1990
Export Citation:
Assignee:
Minolta Co., Ltd.
International Classes:
B41J2/52; B41J2/44; G03G15/00; G03G15/04; G03G15/043; G03G15/32; H04N1/23; H04N1/40; H04N1/405; H04N1/407; (IPC1-7): G03G15/00; B41J2/52; G03G15/04; G03G15/043; H04N1/23; H04N1/407
Domestic Patent References:
| JP2175266A | ||||
| JP1196347A | ||||
| JP2113961A | ||||
| JP241266A |
Attorney, Agent or Firm:
Aoyama Ryo (2 outside people)