Patent US2388014A successfully refreshed from Google Patents.
Patent US4933688A successfully refreshed from Google Patents.
US4933688A
Expired / Lapsed
US
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Laser printer having uniform circumferential laser placement
Assignee: Eastman Kodak Co
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Filing: 1989-01-03
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Granted: 1990-06-12
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Expires: 2009-01-03
Abstract
Abstract A laser printer is disclosed which is adapted to be used for color imaging. The printer comprises three diode lasers, each of which emits at a different wavelength. Each laser beam is passed through an apodizing mask to trim the final spot size. The beams from the three lasers are combined by the use of dichroic mirrors to form one combined beam. The combined beam is shaped by two spherical mirrors and is scanned onto a receiving medium by a polygon. The receiving medium is sensitive to the infrared, and the diode lasers are selected to obtain the widest possible spectral separation in the light beams from the lasers.
Inventors
- 👤 Chris P. Brophy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:51
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/50; H04N1/502
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
76 words
A laser printer comprising: three diode lasers, each of said lasers being adapted to emit a beam of light at a wavelength different from the other lasers, said lasers being disposed around the circumference of a circle and being generally 120° apart; means for combining said beams of light to form a combined beam of light, said combining means including a pair of dichroic elements; and means for scanning said combined beam onto a receiving medium.
Claim 2
Dependent Claim
76 words
A laser printer comprising: three diode lasers, each of said lasers being adapted to emit a beam of light at a wavelength different from the other lasers, said lasers being disposed around the circumference of a circle and being generally 120° apart; means for combining said beams of light to form a combined beam of light, said combining means including a pair of dichroic elements; and means for scanning said combined beam onto a receiving medium.
Claim 3
Dependent Claim
23 words
A printer, as defined in claim 1, wherein said dichroic elements are dichroic mirrors, and said dichroic mirrors are disposed within said circle.
Claim 4
Dependent Claim
22 words
A printer, as defined in claim 2, wherein said mirrors are disposed along the optical axis of one of said light beams.
Claim 5
Dependent Claim
39 words
A printer, as defined in claim 3, wherein one of said mirrors is disposed at an angle of 60° to said optical axis, and the angle of incidence of one of said light beams on said mirror is 30°.
Claim 6
Dependent Claim
34 words
A printer, as defined in claim 4, wherein the other of said mirrors is disposed at an angle of 60° to said optical axis and at an angle of 60° to said one mirror.
References Cited (Backward Citations)
US4467334A
Cited
US4588269A
Cited
US4619892A
Cited
US4681427A
Cited
US4821113A
Cited
US4631551A
Cited
US4728965A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-11 | 1993-12-11 | 1994-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-11 | 1997-12-11 | 1998-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-11 | 2001-12-11 | 2002-06-12 | $7700.00 | Window Closed / Lapsed |