US4725854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser emitting apparatus and laser beam printer using same
Assignee: Canon Inc
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Filing: 1986-06-10
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Granted: 1988-02-16
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Expires: 2006-06-10
Abstract
Abstract An information recording apparatus includes a temperature detector for detecting the temperature of a semiconductor laser and a condition setter for generating a signal corresponding to a laser beam wavelength at a predetermined temperature. The apparatus further includes a control system for controlling a laser output of the semiconductor laser in response to the temperature detection signal from the temperature detector and the condition signal set by the condition setter.
Inventors
- 👤 Yasumasa Ohtsuka
- 👤 Masaharu Ohkubo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:20
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/02; H01S5/024; H01S5/06; H01S5/068; H01S5/06804; H01S5/0617; H01S5/062; H01S5/06209; H01S5/0683
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
68 words
A laser emitting apparatus comprising: a semiconductor laser adapted to emit a laser beam; first beam power setting means for adjusting the power of the laser beam in accordance with the wavelength of the laser beam emitted by said semiconductor laser at a predetermined temperature; and second beam power setting means for adjusting the power of the laser beam in accordance with the temperature of said semiconductor laser.
Claim 2
Dependent Claim
68 words
A laser emitting apparatus comprising: a semiconductor laser adapted to emit a laser beam; first beam power setting means for adjusting the power of the laser beam in accordance with the wavelength of the laser beam emitted by said semiconductor laser at a predetermined temperature; and second beam power setting means for adjusting the power of the laser beam in accordance with the temperature of said semiconductor laser.
Claim 3
Dependent Claim
63 words
A laser emitting apparatus according to claim 1, wherein said first and second beam power setting means generate respective output signals corresponding to the power of the beam to be set, and wherein said apparatus further comprises control means for controlling the power of the beam on the basis of the output signals from said first and the second beam power setting means.
Claim 4
Dependent Claim
65 words
A laser emitting apparatus according to claim 1, wherein said first beam power setting means generates an output signal of reference wavelength at the predetermined temperature and comprises switch means for switching the output signal of reference wavelength between a plurality of levels, and wherein the power of said beam of the apparatus is set on the basis of the output signal of reference wavelength.
Claim 5
Dependent Claim
47 words
A laser emitting apparatus according to claim 1, wherein said second beam power setting means comprises temperature detecting means for detecting the temperature of said semiconductor laser, and wherein the power of said beam is set on the basis of the temperature detected by said detecting means.
Claim 6
Dependent Claim
83 words
A laser beam printer comprising: a photosensitive member; a semiconductor laser emitting a laser beam for irradiating said photosensitive member, said semiconductor laser being modulated in response to recorded information; first beam power setting means for adjusting the power of the laser beam in accordance with the wavelength of the beam emitted by said semiconductor laser at a predetermined temperature; and second beam power setting means for adjusting the power of the laser beam in accordance with the temperature of said semiconductor laser.
Claim 7
Dependent Claim
83 words
A laser beam printer comprising: a photosensitive member; a semiconductor laser emitting a laser beam for irradiating said photosensitive member, said semiconductor laser being modulated in response to recorded information; first beam power setting means for adjusting the power of the laser beam in accordance with the wavelength of the beam emitted by said semiconductor laser at a predetermined temperature; and second beam power setting means for adjusting the power of the laser beam in accordance with the temperature of said semiconductor laser.
Claim 8
Dependent Claim
61 words
A printer according to claim 5, wherein said first and second beam power setting means generate respective output signals corresponding to the power of the beam to be set, and wherein said printer further comprises control means for controlling the power of the beam on the basis of the output signals from said first and the second beam power setting means.
Claim 9
Dependent Claim
63 words
A printer according to claim 5, wherein said first beam power setting means generates an output signal of reference wavelength at the predetermined temperature and comprises switch means for switching the output signal of reference wavelength between a plurality of levels, and wherein the power of the beam of said printer is set on the basis of the output signal of reference wavelength.
Claim 10
Dependent Claim
45 words
A printer according to claim 5, wherein said second beam power setting means comprises temperature detecting means for detecting the temperature of the semiconductor laser, and wherein the power of the beam is set on the basis of the temperature detected by said detecting means.
Claim 11
Dependent Claim
94 words
A printer according to claim 5, wherein the relative sensitivity of said photosensitive member diminishes as the wavelength increases in a wavelength change region due to the temperature of the beam outputted from the semiconductor laser, and wherein said second beam setting means sets the beam power at a high level when the temperature of the semiconductor laser is higher than the predetermined temperature and wherein said second beam power setting means sets the beam power at a low level, lower than said high level, when said temperature is lower than the predetermined temperature.
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) | 1991-02-15 | 1991-08-17 | 1992-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-15 | 1995-08-17 | 1996-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-15 | 1999-08-17 | 2000-02-16 | $7700.00 | Window Closed / Lapsed |