US5703893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser diode module
Assignee: Fujitsu Ltd
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Filing: 1995-07-25
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Granted: 1997-12-30
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Expires: 2015-07-25
Abstract
Abstract Disclosed herein is a laser diode module having a thermoelectric cooling element, a laser diode, and a thermistor in a housing. The thermoelectric cooling element has a first surface and a second surface between which heat exchange is performed. The first surface is in close contact with an inner surface of the housing. A base is provided on the second surface in close contact therewith. A laser carrier and a thermistor carrier are provided on the base in close contact therewith. The laser diode and the thermistor are provided on the laser carrier and the thermistor carrier in close contact therewith, respectively. A portion of the base in the vicinity of the laser carrier is thermally connected to the housing by a metal plate, for example, thereby allowing high-precision temperature control of the laser diode.
Inventors
- 👤 Manabu Komiyama
- 👤 Shunichi Sato
- 👤 Noboru Sonetsuji
- 👤 Tetsuo Ishizaka
- 👤 Saeko Yokoi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:26
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/02; H01S5/024; H01S5/02407; H01S5/02415; H01S5/022; H01S5/02208; H01S5/02216; H01S5/0014; H01S5/005; H01S5/0225; H01S5/02251; H01S5/02438; H01S5/04; H01S5/042; H01S5/06; H01S5/062; H01S5/06209; H01S5/06216; H01S5/068; H01S5/0683
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
161 words
A laser diode module comprising: a housing; a thermoelectric cooling element having a first surface and a second surface, said first surface being in close contact with an inner surface of said housing, for performing heat exchange between said first surface and said second surface according to a supplied control current; a base having a third surface and a fourth surface, said third surface being in close thermal contact with said second surface of said cooling element; a laser carrier and a thermistor carrier both provided on said base in close contact with said fourth surface; a laser diode and a thermistor provided respectively on said laser carrier and said thermistor carrier in close thermal contact therewith; and a metal plate directly connected between said fourth surface of said base and said housing for correcting a temperature balance between said laser diode and said thermistor by thermally connecting a portion of said fourth surface of said base directly to said housing.
Claim 2
Dependent Claim
161 words
A laser diode module comprising: a housing; a thermoelectric cooling element having a first surface and a second surface, said first surface being in close contact with an inner surface of said housing, for performing heat exchange between said first surface and said second surface according to a supplied control current; a base having a third surface and a fourth surface, said third surface being in close thermal contact with said second surface of said cooling element; a laser carrier and a thermistor carrier both provided on said base in close contact with said fourth surface; a laser diode and a thermistor provided respectively on said laser carrier and said thermistor carrier in close thermal contact therewith; and a metal plate directly connected between said fourth surface of said base and said housing for correcting a temperature balance between said laser diode and said thermistor by thermally connecting a portion of said fourth surface of said base directly to said housing.
Claim 3
Dependent Claim
38 words
A laser diode module according to claim 1, wherein: said housing and said base are formed of metal; said housing is maintained at a ground potential; and said metal plate electrically connects said laser carrier to said housing.
Claim 4
Dependent Claim
30 words
A laser diode module according to claim 1, wherein a position on said base connected with said metal plate is opposite to said thermistor with respect to said laser carrier.
Claim 5
Dependent Claim
28 words
A laser diode module according to claim 1, wherein a position on said housing connected with said metal plate is in the vicinity of said thermoelectric cooling element.
Claim 6
Dependent Claim
63 words
A laser diode module according to claim 1, further comprising means for controlling said control current so that a temperature of said thermistor becomes constant, wherein a shape of said metal plate is set so that the temperature of said thermistor becomes substantially the same as a temperature of said laser diode while said control current is being controlled by said control means.
Claim 7
Dependent Claim
69 words
A laser diode module comprising: a laser diode; means for supplying to said laser diode a drive current obtained by superimposing a modulation current on a bias current; a thermoelectric cooling element for cooling said laser diode according to a control current supplied; and means for extracting said bias current from said drive current and supplying said bias current extracted as said control current to said thermoelectric cooling element.
Claim 8
Dependent Claim
69 words
A laser diode module comprising: a laser diode; means for supplying to said laser diode a drive current obtained by superimposing a modulation current on a bias current; a thermoelectric cooling element for cooling said laser diode according to a control current supplied; and means for extracting said bias current from said drive current and supplying said bias current extracted as said control current to said thermoelectric cooling element.
Claim 9
Dependent Claim
159 words
A laser diode module comprising: a housing; a thermoelectric cooling element having a first surface and a second surface, said first surface being in close contact with an inner surface of said housing for performing heat exchange between said first surface and said second surface according to a supplied control current; a base having a third surface and a fourth surface, said third surface being in close thermal contact with said second surface of said cooling element; a laser carrier and a thermistor carrier both provided on said base in close thermal contact with said fourth surface; a laser diode and a thermistor provided respectively on said laser carrier and said thermistor carrier in close thermal contact therewith, and; a metal plate directly connected between said base and said housing, separate and distinct from said base, for correcting a temperature balance between said laser diode and said thermistor by thermally connecting a portion of said base to said housing.
Claim 10
Dependent Claim
159 words
A laser diode module comprising: a housing; a thermoelectric cooling element having a first surface and a second surface, said first surface being in close contact with an inner surface of said housing for performing heat exchange between said first surface and said second surface according to a supplied control current; a base having a third surface and a fourth surface, said third surface being in close thermal contact with said second surface of said cooling element; a laser carrier and a thermistor carrier both provided on said base in close thermal contact with said fourth surface; a laser diode and a thermistor provided respectively on said laser carrier and said thermistor carrier in close thermal contact therewith, and; a metal plate directly connected between said base and said housing, separate and distinct from said base, for correcting a temperature balance between said laser diode and said thermistor by thermally connecting a portion of said base to said housing.
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) | 2000-12-29 | 2001-06-30 | 2001-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-12-29 | 2005-06-30 | 2005-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-12-29 | 2009-06-30 | 2009-12-30 | $7700.00 | Window Closed / Lapsed |