US4959665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser printer with harmonic wave separation of the beam
Assignee: Ricoh Printing Systems Ltd
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Filing: 1989-08-15
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Granted: 1990-09-25
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Expires: 2009-08-15
Abstract
Abstract In an information device which has a laser light source and a non-linear optical crystal for converting the laser fundamental wave light irradiated from the laser light source into harmonic wave light and uses the laser light passing through the non-linear optical crystal, a prism or an optical grating is provided to separate an optical path of the fundamental wave light remaining in the laser light passing through the crystal from an optical path of the harmonic wave light with the purpose of eliminating the fundamental wave light. In another embodiment, a polarization filter is provided to eliminate the fundamental wave light.
Inventors
- 👤 Susumu Saito
- 👤 Akira Arimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:12
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02F; G02F1/00; G02F1/35; G02F1/37; B; B41; B41J; B41J2/00; B41J2/435; B41J2/47; B41J2/471; G02B26/00; G02B26/08; G02B26/10
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
112 words
An information device using laser light, comprising: a laser light source; a conversion element for converting laser fundamental wave light irradiated from said laser light source into harmonic wave light; a photo-receptor for receiving laser light passing through said conversion element; and a dispersive element which is provided in an optical path between said conversion element and said photo-receptor and separates an optical path of the fundamental wave light remaining in said laser light passing through said conversion element from an optical path of the harmonic wave light so as to allow the harmonic wave light to reach said photo-receptor but not to allow the fundamental wave light to reach said photo-receptor.
Claim 2
Dependent Claim
112 words
An information device using laser light, comprising: a laser light source; a conversion element for converting laser fundamental wave light irradiated from said laser light source into harmonic wave light; a photo-receptor for receiving laser light passing through said conversion element; and a dispersive element which is provided in an optical path between said conversion element and said photo-receptor and separates an optical path of the fundamental wave light remaining in said laser light passing through said conversion element from an optical path of the harmonic wave light so as to allow the harmonic wave light to reach said photo-receptor but not to allow the fundamental wave light to reach said photo-receptor.
Claim 3
Dependent Claim
16 words
An information device according to claim 1, wherein said dispersive element is comprised of a prism.
Claim 4
Dependent Claim
17 words
An information device according to claim 1, wherein said dispersive element is comprised of an optical grating.
Claim 5
Dependent Claim
92 words
An information device using laser light, comprising: a laser light source; a conversion element for converting laser fundamental wave light irradiated from said laser light source into harmonic wave light; a photo-receptor for receiving laser light passing through said conversion element; and a polarization filter which is provided in an optical path between said conversion element and said photo-receptor that has a polarization characteristic that allows the harmonic wave light to pass but does not allow the fundamental wave light remaining in said laser light passing through said conversion element to pass.
Claim 6
Dependent Claim
92 words
An information device using laser light, comprising: a laser light source; a conversion element for converting laser fundamental wave light irradiated from said laser light source into harmonic wave light; a photo-receptor for receiving laser light passing through said conversion element; and a polarization filter which is provided in an optical path between said conversion element and said photo-receptor that has a polarization characteristic that allows the harmonic wave light to pass but does not allow the fundamental wave light remaining in said laser light passing through said conversion element to pass.
Claim 7
Dependent Claim
82 words
An information device according to claim 4, wherein said conversion element is comprised of a non-linear optical crystal which converts laser fundamental wave light incident thereupon into second harmonic wave light so as to make a polarization direction of the fundamental wave light and that of the second harmonic wave light orthogonal with each other, and said polarization filter having a polarization characteristic that allows the second harmonic wave light to pass but does not allow the fundamental wave light to pass.
Claim 8
Dependent Claim
113 words
A laser printer comprising: a laser light source; a conversion element for converting laser fundamental wave light irradiated from said laser light source into harmonic wave light; a photoconductive drum scanned with laser light passing through said conversion element; and a dispersive element which is provided in an optical path between said conversion element and said photoconductive drum and separates an optical path of the fundamental wave light remaining in said laser light passing through said conversion element from an optical path of the harmonic wave light so as to allow the harmonic wave light to reach said photoconductive drum but not to allow the fundamental wave light to reach said photoconductive drum.
Claim 9
Dependent Claim
113 words
A laser printer comprising: a laser light source; a conversion element for converting laser fundamental wave light irradiated from said laser light source into harmonic wave light; a photoconductive drum scanned with laser light passing through said conversion element; and a dispersive element which is provided in an optical path between said conversion element and said photoconductive drum and separates an optical path of the fundamental wave light remaining in said laser light passing through said conversion element from an optical path of the harmonic wave light so as to allow the harmonic wave light to reach said photoconductive drum but not to allow the fundamental wave light to reach said photoconductive drum.
Claim 10
Dependent Claim
16 words
A laser printer according to claim 6, wherein said dispersive element is comprised of a prism.
Claim 11
Dependent Claim
17 words
A laser printer according to claim 6, wherein said dispersive element is comprised of an optical grating.
Claim 12
Dependent Claim
91 words
A laser printer comprising: a laser light source; a conversion element for converting laser fundamental wave light irradiated from said laser light source into harmonic wave light; a photoconductive drum scanned with laser light passing through said conversion element; and a polarization filter which is provided in an optical path between said conversion element and said photoconductive drum and has a polarization characteristic that allows the harmonic wave light to pass but does not allow the fundamental wave light remaining in said laser light passing through said conversion element to pass.
Claim 13
Dependent Claim
91 words
A laser printer comprising: a laser light source; a conversion element for converting laser fundamental wave light irradiated from said laser light source into harmonic wave light; a photoconductive drum scanned with laser light passing through said conversion element; and a polarization filter which is provided in an optical path between said conversion element and said photoconductive drum and has a polarization characteristic that allows the harmonic wave light to pass but does not allow the fundamental wave light remaining in said laser light passing through said conversion element to pass.
Claim 14
Dependent Claim
82 words
A laser printer according to claim 9, wherein said conversion element is comprised of a non-linear optical crystal which converts laser fundamental wave light incident thereupon into second harmonic wave light so as to make a polarization direction of the fundamental wave light and that of the second harmonic wave light orthogonal with each other, and said polarization filter has a polarization characteristic that allows the second harmonic wave light to pass but does not allow the fundamental wave light to pass.
Claim 15
Dependent Claim
123 words
An optical disc device comprising: a laser light source; a conversion element for converting laser fundamental wave light irradiated from said laser light source into harmonic wave light; an optical disc into or from which information is written or read out with laser light passing through said conversion element; and a dispersive element which is provided in an optical path between said conversion element and said optical disc and separates an optical path of the fundamental wave light remaining in said laser light passing through said conversion element from an optical path of the harmonic wave light so as to allow the harmonic wave light to reach said optical disc but not to allow the fundamental wave light to reach said optical disc.
Claim 16
Dependent Claim
123 words
An optical disc device comprising: a laser light source; a conversion element for converting laser fundamental wave light irradiated from said laser light source into harmonic wave light; an optical disc into or from which information is written or read out with laser light passing through said conversion element; and a dispersive element which is provided in an optical path between said conversion element and said optical disc and separates an optical path of the fundamental wave light remaining in said laser light passing through said conversion element from an optical path of the harmonic wave light so as to allow the harmonic wave light to reach said optical disc but not to allow the fundamental wave light to reach said optical disc.
Claim 17
Dependent Claim
17 words
An optical disc device according to claim 11, wherein said dispersive element is comprised of a prism.
Claim 18
Dependent Claim
18 words
An optical disc device according to claim 11, wherein said dispersive element is comprised of an optical grating.
Claim 19
Dependent Claim
101 words
An optical device comprising: a laser light source; a conversion element for converting laser fundamental wave light irradiated from said laser light source into harmonic wave light; an optical disc into or from which information is written or read out with laser light passing through said conversion element; and a polarization filter which is provided in an optical path between said conversion element and said optical disc and that has a polarization characteristic that allows the harmonic wave light to pass but does not allow the fundamental wave light remaining in said laser light passing through said conversion element to pass.
Claim 20
Dependent Claim
101 words
An optical device comprising: a laser light source; a conversion element for converting laser fundamental wave light irradiated from said laser light source into harmonic wave light; an optical disc into or from which information is written or read out with laser light passing through said conversion element; and a polarization filter which is provided in an optical path between said conversion element and said optical disc and that has a polarization characteristic that allows the harmonic wave light to pass but does not allow the fundamental wave light remaining in said laser light passing through said conversion element to pass.
Claim 21
Dependent Claim
82 words
An optical device according to claim 14, wherein said conversion element is comprised of a non-linear optical crystal which converts laser fundamental wave light incident thereupon into second harmonic wave light so as to make a polarization direction of the fundamental wave light and that of the second harmonic wave light orthogonal with each other, and said polarization filter having a polarization characteristic that allows the second harmonic wave light to pass but does not allow the fundamental wave light to pass.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-09-24 | 1994-03-26 | 1994-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-24 | 1998-03-26 | 1998-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-24 | 2002-03-26 | 2002-09-25 | $7700.00 | Window Closed / Lapsed |