Patent US714389A successfully refreshed from Google Patents.
Patent US5154338A successfully refreshed from Google Patents.
US5154338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solder reflow furnace
Assignee: SENJI METAL INDUSTRY Co Ltd A JAPANESE BODY CORP
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Filing: 1991-06-05
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Granted: 1992-10-13
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Expires: 2011-06-05
Abstract
Abstract A reflow furnace has a tunnel through which a conveyor for printed circuit boards passes. A plurality of pairs of panel-type blowers capable of blowing hot gas are disposed in the tunnel. The two panel-type blowers in each pair are disposed opposite one another above and below the conveyor. Each panel-type blower has an inlet and a discharge port. The discharge ports of opposing panel-type blowers partially overlap one another in the longitudinal direction of the furnace. When a printed circuit board is present between a pair of panel-type blowers, gas discharged from the discharge ports simultaneously heats both sides of the printed circuit board.
Inventors
- 👤 Tetsuya Okuno
- 👤 Takashi Nauchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:15
CPC Classifications
B; B23; B23K; B23K1/00; B23K1/008; H; H05; H05K; H05K3/00; H05K3/30; H05K3/32; H05K3/34; H05K3/3494
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
94 words
A reflow furnace for soldering electrical components comprising: a tunnel; a conveyor for printed circuit boards extending through the tunnel; at least one pair of panel-type blowers disposed in the tunnel, each pair comprising an upper panel-type blower and a lower panel-type blower disposed on opposite sides of the conveyor, each of the panel-type blowers having a discharge port and an inlet, the discharge port of each panel-type blower opposing the inlet of the opposing panel-type blower and overlapping the discharge port of the opposing panel-type blower in the longitudinal direction of the tunnel.
Claim 2
Dependent Claim
94 words
A reflow furnace for soldering electrical components comprising: a tunnel; a conveyor for printed circuit boards extending through the tunnel; at least one pair of panel-type blowers disposed in the tunnel, each pair comprising an upper panel-type blower and a lower panel-type blower disposed on opposite sides of the conveyor, each of the panel-type blowers having a discharge port and an inlet, the discharge port of each panel-type blower opposing the inlet of the opposing panel-type blower and overlapping the discharge port of the opposing panel-type blower in the longitudinal direction of the tunnel.
Claim 3
Dependent Claim
17 words
A reflow furnace as claimed in claim 1 wherein the overlap is approximately 25% to approximately 75%.
Claim 4
Dependent Claim
24 words
A reflow furnace as claimed in claim 1 wherein the panel-type blower is that which simultaneously generates both hot gas and far infrared rays.
Claim 5
Dependent Claim
39 words
A reflow furnace as claimed in claim 1 wherein the amount of overlap is such that an upward blowing region, a hot gas impact region, and a downward blowing region are provided between the upper and lower panel-type blowers.
Claim 6
Dependent Claim
46 words
A reflow furnace as claimed in claim 1 wherein the tunnel is divided into a preheating zone, a main heating zone, and a cooling zone, and at least one pair of the panel-type blowers is provided in each of the preheating zone and main heating zone.
Claim 7
Dependent Claim
70 words
A reflow furnace as claimed in claim 1 wherein each of the panel-type blowers comprises: a housing having an outlet confronting the conveyor and constituting the discharge port; a porous plate member disposed in the outlet; a heating element disposed in the vicinity of the porous plate member; and a fan for causing a gas to flow through the inlet, through the porous plate member, and through the discharge port.
Claim 8
Dependent Claim
48 words
A reflow furnace as claimed in claim 6 wherein each of the panel-type blowers comprises: a duct having a first end having an inlet opposing the conveyor and a second end connected to the inlet of the housing, the fan being disposed between the first and second ends.
Claim 9
Dependent Claim
31 words
A reflow furnace as claimed in claim 7 wherein the inlet of the duct and the outlet of the housing lie next to one another and in substantially the same plane.
Claim 10
Dependent Claim
27 words
A reflow furnace as claimed in claim 6 wherein the area of the discharge port is 2 times or more larger than the area of the inlet.
Claim 11
Dependent Claim
27 words
A reflow furnace as claimed in claim 6 wherein the porous plate member is metallic, and a ceramic layer is provided on this porous metallic plate member.
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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) | 1995-10-13 | 1996-04-13 | 1996-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-13 | 2000-04-13 | 2000-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-13 | 2004-04-13 | 2004-10-13 | $7700.00 | Window Closed / Lapsed |