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US 4,978,970 AGranted
Scanning/recording system with plural beam overlap without interference
AssigneeDainippon Screen Mfg. Co., Ltd.
InventorMasahide Okazaki
Life of this patent
Estimating the term…
Abstract
An uncomplicated system for exposing a recording medium by scanning the medium with laser light to form a clear, uniformly dense recording pattern without interference.
Claims32
An apparatus for exposing a recording medium, comprising:
- means for forming laser beams, said forming means including a single source of laser light for forming a source beam, and means for splitting said source beam into said laser beam;
- means for independently modulating said laser beams;
- means for synthesizing said laser beams to form a synthesized beam, said synthesizing means includes means for synthesizing said laser beams so that portions thereof overlap each other;
- an optical system for projecting said synthesized beam onto a recording medium to form a line;
- and
- means for polarizing said laser beams so that said laser beams are orthogonally polarized with respect to each other.
3 more elements
An apparatus for exposing a recording medium, comprising:
- means for forming laser beams, said forming means including a single source of laser light for forming a source beam, means for splitting said source beam into said laser beams, and means for defining a first optical path and a second optical path, said optical paths having different lengths, the difference between said lengths being longer than the coherence length of said laser beams;
- means for independently modulating said laser beams;
- means for synthesizing said laser beams to form a synthesized beam;
- and
- an optical system for projecting said synthesized beam onto a recording medium to form a line.
2 more elements
A method of exposing a recording medium to form an image, comprising the steps of:
- forming two laser beams;
- said forming step including the steps of providing a single laser light source, irradiating a source beam from said sourse, splitting said irradiated source beam into said laser beams, and polarizing said laser beams so that said beams are orthogonally polarized with respect to each other;
- independently moduating said laser beams;
- and
- projecting said modulated laser beams in an overlapping manner onto a recording medium.
2 more elements
A method of exposing a recording medium to form an image, comprising the steps of:
- forming two laser beams;
- said forming step includes the steps of providing a single laser light source, inrradiating a source beam from said source, splitting said irradiated source beam into said laser beams, and
- defining two optical paths which have a difference in length which is longer than the coherence length of said laser beams;
- independently modulating said laser beams;
- and
- projecting said modulated laser beams in an overlapping manner onto a recording medium.
3 more elements
Apparatus for forming a line, comprising:
- first and second arrayed laser diodes different from
- each other and each having a respective plurality of light emitting edges and a modulation function for modulating laser light emitted therefrom;
- a synthesizing means including a polarized beamsplitter for synthesizing laser beams emitted
- from said first and second arrayed laser diodes;
- said synthesizing means synthesizing said laser beams in a staggered arrangement to form a plurality of staggered beam spot lines;
- and
- an optical system for projecting said synthesized beam onto a recording medium to form a line.
4 more elements
A method of exposing a recording medium, comprising the steps of:
- providing a first laser beam from a first laser source;
- splitting said first laser beam into a plurality of laser beams and modulating independently said plurality of laser beams;
- providing a second laser beam from a second laser source different from said first laser source;
- splitting said second laser beam into a plurality of laser beams and modulating independently said foregoing plurality of laser beams;
- synthesizing said first and second modulated beams in a staggered arrangement to form a plurality of staggered beam spot lines;
- and
- projecting said synthesized beams onto a recording medium to form a line;
- said step of sythesizing including the step of using a polarized beamsplitter.
5 more elements
A method for forming a line, comprising the steps of:
- synthesizing laser beams emitted from first and second arrayed laser diodes that are different from each other and that each have a respective plurality of light emitting edges and a modulation function for modulating laser light emitted therefrom;
- synthesizing said laser beams in a staggered arrangement to form a plurality of staggered beam spot lines;
- and
- projecting said synthesized beam onto a recording medium to form a line;
- said step of synthesizing including the step of using a polarized beamsplitter.
2 more elements
An apparatus for exposing a recording medium, comprising:
- means for forming laser beams;
- means for independently modulating said laser beams;
- means for synthesizing said laser beams to form a synthesized beam, said synthesizing means including means for synthesizing said laser beams in a staggered arrangement to form a plurality of staggered beam spot lines;
- an optical system for projecting said synthesized beam onto a recording medium to form a line;
- each of said laser beams including a plurality of component laser beams;
- and
- means for directing said component laser beams toward said synthesizing means from different directions;
- and
- means for scanning said synthesized beam across said recording medium in a direction which is orthogonal to said line.
6 more elements
A method of exposing a recording medium, comprising the steps of:
- providing a first laser beam from a first laser source;
- splitting said first laser beam into a plurality of laser beams and modulating independently said plurality of laser beams;
- providing a second laser beam from a second laser source different from said first laser source;
- splitting said second laser beam into a plurality of laser beams and modulating independently said foregoing plurality of laser beams;
- synthesizing said first and second modulated beams in a staggered arrangement to form a plurality of staggered beam spot lines;
- projecting said synthesized beams onto a recording medium to form a line;
- projecting said modulated laser beams onto said recording medium to form a line;
- and
- scanning said laser beams across said recording medium in a direction orthogonal to said line.
6 more elements
A method for forming a line, comprising the steps of:
- synthesizing laser beams emitted from first and second arrayed laser diodes that are different from each other and that each have a respective plurality of light emitting edges and a modulation function for modulating laser light emitted therefrom;
- synthesizing said laser beams in a staggered arrangement to form a plurality of staggered beam spot lines projecting said synthesized beam onto a recording medium to form a line;
- projecting said modulated laser beams onto said recording medium to form a line;
- and
- scanning said laser beams across said recording medium in a direction orthogonal to said line.
2 more elements
A method of exposing a recording medium, comprising the steps of:
- forming laser beams each of which includes a plirality of component laser beams oriented in different directions;
- independently modulating said laser beams and projected said modulated laser beams onto said recording medium to form a line;
- synthesizing said laser beams to form a synthesized beam, said step of synthesizing including the step of synthesizing said laser beams in a staggered arrangement to form a plurality of staggered beam spot lines;
- projecting said synthesized beam onto a recording medium to form a line;
- and
- scanning said laser beams across said recording medium in a direction orthogonal to said line.
3 more elements
Dependencies are inferred from the claim text.