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US 5,251,055 AGranted
Optical scanning apparatus
AssigneeCanon Kabushiki Kaisha
InventorJun Koide
Life of this patent
Estimating the term…
Abstract
An optical scanning apparatus for effecting the scanning with plural light beams, without aberrations among the obtained scanning lines and without curvature in the scanning lines. For this purpose plural light beams emitted from plural light sources are deflected by a single deflector, composed for example of a rotary polygon mirror, and guided to respective scanned planes through a scanning condenser lens system, having the f-.theta. characteristics in the scanning direction and also having plural optical axes in the sub scanning direction.
Claims28
An optical scanning apparatus comprising:
- plural light sources;
- a deflector for deflecting plural light beams from said plural light sources;
- and
- an optical system for focusing plural light beams deflected by said deflector, onto predetermined planes, said optical system having f-.theta. characteristics in a scanning direction and having plural optical axes in a sub scanning direction;
- wherein said optical system is comprised of a first optical system and a second optical system, in which said first optical system has an afocal refractive power in the sub scanning direction, while said second optical system has plural axes respectively corresponding to said plural light beams, said second optical system focusing in the scanning direction and in the sub scanning direction.
2 more elements
An optical scanning apparatus comprising:
- plural light sources;
- a deflector for deflecting plural light beams from said plural light sources;
- an optical system for focusing plural light beams deflected by said deflector, onto predetermined planes, said optical system having f-.theta. characteristics in the scanning direction and having plural optical axes in the sub scanning direction;
- and
- guiding means for guiding some of said plural light beams form some of said plural light sources to said deflector after passing between said deflector and said optical system;
- wherein said optical system is comprised of a first optical system and a second optical system, in which said first optical system has an afocal refractive power in the sub scanning direction, while said second optical system has plural axes respectively corresponding to said plural light beams.
3 more elements
An image recording apparatus comprising:
- plural light sources;
- a deflector for deflecting plural light beams from said plural light sources;
- an optical system for focusing the plural light beams deflected by said deflector, said optical system having f-.theta. characteristics in a scanning direction and having plural optical axes in a sub scanning direction;
- and
- a photosensitive member on which said plural light beams deflected by said deflector are focused by said optical system;
- wherein said optical system is comprised of a first optical system and a second optical system, in which said first optical system has an afocal refractive power in the sub scanning direction, while said second optical system has plural axes respectively corresponding to said plural light beams, said second optical system focusing in the scanning direction and in the sub scanning direction.
3 more elements
An optical scanning apparatus comprising:
- means for generating plural light beams;
- a deflector for deflecting plural light beams from said generating means;
- and
- an optical system for focusing plural light beams deflected by said deflector onto predetermined planes, said optical system having f-.theta. characteristics in a scanning direction and comprising a first optical system and a second optical system, said first optical system having an afocal refractive power in a sub scanning direction, said second optical system having plural optical axes in the sub scanning direction, said second optical system focusing in the scanning direction and in the sub scanning direction.
1 more element
An optical scanning apparatus comprising:
- means for generating plural light beams;
- a deflector for deflecting plural light beams from said generating means;
- an optical system for focusing plural light beams deflected by said deflector onto predetermined planes;
- and
- means for guiding some of said plural light beams from said generating means to said deflector after passing between said deflector and said optical system.
2 more elements
A laser beam printer apparatus comprising:
- plural light sources;
- a deflector for deflecting plural light beams from said plural light sources;
- an optical system for focusing plural light beams deflected by said deflector, onto predetermined planes, said optical system having f-.theta. characteristics in a scanning direction and having plural optical axes in a sub scanning direction, wherein said optical system is comprised of a first optical system and a second optical system, in which said first optical system has an afocal refractive power in the sub scanning direction, while said second optical system has plural axes respectively corresponding to said plural light beams, said second optical system focusing in the scanning direction and in the sub scanning direction;
- guiding means for guiding some of said plural light beams form some of said plural light sources to said deflector after passing between said deflector and said optical system;
- and
- a recording medium for receiving said plural light beams focused by said optical system.
3 more elements
A laser beam printer apparatus comprising:
- plural light sources for generating plural light beams;
- a deflector for deflecting plural light beams from said generating means;
- an optical system for focusing plural light beams deflected by said deflector, onto predetermined planes, said optical system having f-.theta. characteristics in a scanning direction and comprising a first optical system having an afocal refractive power in a sub scanning direction, said second optical system having plural optical axes in the sub scanning direction, said second optical system focusing in the scanning direction and in the sub scanning direction;
- and
- a recording medium for receiving said plural light beams deflected by said deflector and focused by said optical system.
2 more elements
A laser beam printer apparatus comprising:
- means for generating plural light beams;
- a deflector for deflecting plural light beams from said generating means;
- an optical system for focusing plural light beams deflected by said deflector onto predetermined planes;
- means for guiding some of said plural light beams from said generating means to said deflector after passing between said deflector and said optical system;
- and
- a recording medium for receiving said plural light beams focused by said optical system.
3 more elements
A scanning method in an optical scanning apparatus, comprising the steps of:
- deflectively scanning plural light beams;
- and
- guiding the deflectively scanned plural light beams to a predetermined plane by an optical system having f-.theta. characteristics with relation to the scanning direction and plural optical axes with relation to the sub-scanning direction;
- wherein said optical system is composed of a first optical system and a second optical system, in which the first optical system has an afocal refractive power in the sub-scanning direction, and the second optical system has plural optical axes, one for each of the plural light beams, and a focusing effect in the scanning and sub-scanning direction.
1 more element
A recording method in a laser beam print apparatus, comprising the steps of:
- deflectively scanning plural light beams;
- and
- guiding the deflectively scanned plural light beams to a predetermined plane by an optical system having f-.theta. characteristics with relation to the scanning direction and plural optical axes with relation to the sub-scanning direction;
- wherein said optical system is composed of a first optical system and a second optical system, in which the first optical system has an afocal refractive power in the sub-scanning direction and in which the second optical system has plural optical axes, one for each of the plural light beams, and a focusing effect in the scanning and sub-scanning directions.
1 more element
Dependencies are inferred from the claim text.