Patent FR698393A successfully refreshed from Google Patents.
Patent US5488625A successfully refreshed from Google Patents.
US5488625A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor laser device having chip-mounted heating element
Assignee: Canon Inc
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Filing: 1993-10-05
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Granted: 1996-01-30
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Expires: 2013-10-05
Abstract
Abstract A semiconductor device includes a chip, a laser element formed on the chip and a heating element formed on the chip. The laser element is driven to emit a laser beam upon light-on of a laser. Upon light-off of a laser, switching is made so that the heating element is driven so as not to emit the laser beam in the normal laser beam emission direction by the laser element.
Inventors
- 👤 Tomohiro Nakamori
- 👤 Hiroshi Hashimoto
- 👤 Soya Endo
- 👤 Hitoshi Machino
- 👤 Masanori Ishizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:24
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/02; H01S5/024; H01S5/02453; H01S5/026; H01S5/40; H01S5/4025; H01S5/022; H01S5/02208; H01S5/02212; H01S5/0261; H01S5/028; H01S5/04; H01S5/042; H01S5/06; H01S5/0607; H01S5/0612; H01S5/068; H01S5/0683; H01S5/06837; H01S5/4031; H01S5/4037; H01S5/4056
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
57 words
A semiconductor laser device comprising: a chip; a laser element formed on said chip, said laser element being operable to emit a laser beam in a first direction; and a heating element formed on the chip, said heating element comprising a heating laser element formed so as not to emit a laser beam in the first direction.
Claim 2
Dependent Claim
57 words
A semiconductor laser device comprising: a chip; a laser element formed on said chip, said laser element being operable to emit a laser beam in a first direction; and a heating element formed on the chip, said heating element comprising a heating laser element formed so as not to emit a laser beam in the first direction.
Claim 3
Dependent Claim
13 words
A device according to claim 1, wherein said heating element heats the chip.
Claim 4
Dependent Claim
26 words
A semiconductor laser device according to claim 1, further comprising a control device for controlling switchover and drive of said laser element and said heating element.
Claim 5
Dependent Claim
67 words
A semiconductor laser device comprising: a chip; a laser element formed on the chip; and a diode element formed on the chip, wherein when said diode element is connected to a power source to which said laser element is connected, the diode element generates a heat amount which is approximately equal to an amount of heat which is generated when the laser element emits a laser beam.
Claim 6
Dependent Claim
67 words
A semiconductor laser device comprising: a chip; a laser element formed on the chip; and a diode element formed on the chip, wherein when said diode element is connected to a power source to which said laser element is connected, the diode element generates a heat amount which is approximately equal to an amount of heat which is generated when the laser element emits a laser beam.
Claim 7
Dependent Claim
22 words
A semiconductor laser device according to claim 4, further comprising a detection element for detecting an emission intensity of said laser element.
Claim 8
Dependent Claim
38 words
A semiconductor laser device according to claim 4, further comprising a control device for driving said laser element at a time of laser turn-on and for switching to drive said diode element at the time of laser turn-off.
Claim 9
Dependent Claim
18 words
A semiconductor laser device according to claim 4, wherein said diode element is used for heating said chip.
Claim 10
Independent Claim
61 words
A method of driving a semiconductor laser device, comprising the steps of: forming on a single chip a laser element and a heating laser element which does not emit a laser beam in a direction in which the laser element emits a laser beam; driving the laser element; and driving the heating laser element when the laser element is not driven.
Claim 11
Independent Claim
61 words
A method of driving a semiconductor laser device, comprising the steps of: forming on a single chip a laser element and a heating laser element which does not emit a laser beam in a direction in which the laser element emits a laser beam; driving the laser element; and driving the heating laser element when the laser element is not driven.
Claim 12
Dependent Claim
21 words
A method according to claim 8, wherein said heating laser element heats said chip when said heating laser element is driven.
Claim 13
Independent Claim
37 words
A method of driving a semiconductor laser device, comprising: driving a laser element; and driving a diode element formed on the same chip on which said laser element is formed when said laser element is not driven.
Claim 14
Independent Claim
37 words
A method of driving a semiconductor laser device, comprising: driving a laser element; and driving a diode element formed on the same chip on which said laser element is formed when said laser element is not driven.
Claim 15
Dependent Claim
19 words
A method according to claim 10, wherein said diode element heats said chip when said diode element is driven.
Claim 16
Dependent Claim
46 words
A method according to claim 10, wherein when said diode element is connected to a power source to which said laser element is connected, said diode element generates a heat amount of which is approximately equal to that generated when said laser element emits laser beam.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-01-29 | 1999-07-31 | 2000-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-01-29 | 2003-07-31 | 2004-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-01-29 | 2007-07-31 | 2008-01-30 | $7700.00 | Window Closed / Lapsed |