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US 5,856,841 AGranted
Image formation method and image formation apparatus for forming a high definition and high quality image
AssigneeFuji Xerox Co., Ltd.
InventorsKoichiro Shinohara, Masahiro Takamatsu, Akira Ishii, Hideki Moriya, Kenji Ogi
Life of this patent
Estimating the term…
Abstract
To form an exposed image with striking contrast on photosensitive material and form a high definition and high quality image, a first beam modulated according to an image signal and a second beam modulated according to an inverted image signal generated by inverting this image signal with smaller deelectrification effect than the first beam are synthesized on the photosensitive material.
Claims32
An image formation method comprising the step of:
- outputting an image signal generated by processing image information and an inverted image signal generated by inverting said image signal;
- emitting a first beam with predetermined luminous intensity modulated according to said image signal and a second beam with luminous intensity smaller than said predetermined luminous intensity modulated according to said inverted image signal;
- synthesizing said first beam and said second beam to generate a synthesized beam;
- and
- forming an electrostatic latent image on photosensitive material by scanning said synthesized beam in a horizontal scanning direction on said photosensitive material moved in a vertical scanning direction.
2 more elements
An image formation method comprising the steps of:
- outputting an image signal generated by processing image information and an inverted image signal generated by inverting said image signal;
- emitting a first beam with predetermined luminous intensity modulated according to said image signal and a second beam with luminous intensity smaller than said predetermined luminous intensity modulated according to said inverted image signal at respective predetermined timing so that an imaged point is equal;
- and
- forming an electrostatic latent image on photosensitive material by scanning said first and second beams in the horizontal scanning direction on said photosensitive material moved in the vertical scanning direction.
1 more element
An image formation apparatus comprising:
- signal generating means for generating an image signal obtained by processing image information and an inverted image signal obtained by inverting this image signal;
- a first light source for emitting a first beam with predetermined luminous intensity modulated according to said image signal;
- a second light source for emitting a second beam with luminous intensity smaller than said predetermined luminous intensity modulated according to said inverted image signal;
- synthesizing means for synthesizing said first beam and said second beam;
- scanning means for scanning a synthesized beam synthesized by said synthesizing means in the horizontal scanning direction;
- photosensitive material for receiving the exposure of said synthesized beam, being moved in the vertical scanning direction and forming an electrostatic latent image;
- and
- control means for controlling a timing of emission of first said light source and said second light source.
5 more elements
An image formation apparatus comprising:
- signal generating means for generating an image signal obtained by processing image information and an inverted image signal obtained by inverting said image signal;
- a first light source for emitting a first beam with predetermined luminous intensity modulated according to said image signal;
- a second light source for emitting a second beam with luminous intensity smaller than said predetermined luminous intensity modulated according to said inverted image signal;
- scanning means for scanning said first beam and said second beam emitted from said first light source and said second light source in a horizontal scanning direction;
- photosensitive material for receiving the exposure of said first beam and said second beam, being moved in a vertical scanning direction and forming an electrostatic latent image;
- and
- control means for controlling a timing of emission of said first light source and said second light source so that said first beam emitted from said first light source and said second beam emitted from said second light source are synthesized on an imaged face of said photosensitive material.
4 more elements
An image formation apparatus for writing image information to photosensitive material by scanning a beam every line in another direction perpendicular to a direction in which said photosensitive material is moved, comprising:
- an image writing light source provided with beam diameter for providing resolution specified in said image information to said photosensitive material for writing said image information;
- first beam driving means for providing a modulated signal according to said image information to said image writing light source;
- an image correcting light source provided with beam diameter larger than that of said image writing light source and with luminous intensity weaker than that of a luminous flux of said image writing light source;
- second beam driving means for providing an inverted signal with reverse luminous intensity to that of a modulated signal according to said image information and to said image correcting light source periodically;
- synthesizing means for synthesizing the luminous flux of said image writing light source and that of said image correcting light source;
- a rotary polygon mirror for scanning said photosensitive material in said another direction by said synthesized luminous flux;
- an optical system for leading said synthesized luminous flux to said photosensitive material via said rotary polygon mirror;
- and
- a control unit connected to said first beam driving means and said second beam driving means for adjusting a period and phase of the luminous flux of said image correcting light source to a period and phase of said modulated signal of said image writing light source.
6 more elements
An image formation apparatus for writing image information to photosensitive material by scanning a beam every line in another direction perpendicular to a direction in which said photosensitive material is moved, comprising:
- an image writing light source provided with beam diameter for providing resolution specified in said image information to said photosensitive material for writing said image information;
- first beam driving means for providing a modulated signal according to said image information to said image writing light source;
- an image correcting light source provided with a beam profile duller than that of said image writing light source and with luminous intensity weaker than that of a luminous flux of said image writing light source;
- second beam driving means for providing an inverted signal with reverse luminous intensity to that of a modulated signal according to said image information and to said image correcting light source periodically;
- synthesizing means for synthesizing the luminous flux of said image writing light source and that of said image correcting light source;
- a rotary polygon mirror for scanning said photosensitive material in said another direction by said synthesized luminous flux;
- an optical system for leading said synthesized luminous flux to said photosensitive material via said rotary polygon mirror;
- and
- a control unit connected to said first beam driving means and said second beam driving means for adjusting a period and phase of the luminous flux of said image correcting light source to a period and phase of said modulated signal of said image writing light source.
6 more elements
Dependencies are inferred from the claim text.