US3862394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal recording print head and method for manufacturing same
Assignee: Honeywell Inc
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Filing: 1974-04-03
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Granted: 1975-01-21
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Expires: 1994-04-03
Abstract
Abstract A thermal print head and a method of manufacturing it using a thermally stable support mandrel and a plurality of spaced turns of copper-coated resistance wire wrapped on the mandrel. The turns are held on the mandrel by slabs of potting compound retained in under-cut grooves on the mandrel while the connections to the print elements are made by slitting the turns along a longitudinal groove in the mandrel. The copper coating is removed to expose the resistance wire at the desired printing element locations.
Inventors
- 👤 Iii Charles E Lane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:47
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/315; B41J2/32; B41J2/335; B41J2/33505; B41J2/33535; B41J2/33555; B41J2/33565; B41J2/3359
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
110 words
A thermal print head comprising: a thermally stable and electrically insulating support mandrel means having a first longitudinal support edge between a pair of mandrel faces; a plurality of spaced heating elements supported on said first support edge; a plurality of electrical conductors electrically connected to said heating elements respectively with each heating element having a pair of electrical conductors attached thereto with each electrical conductor of each pair of said electrical conductors extending across and in contact with a corresponding one of said mandrel faces, and retaining means for individually attaching each of said electrical conductors to said mandrel and for maintaining said spaced relationship of said heating elements.
Claim 2
Dependent Claim
110 words
A thermal print head comprising: a thermally stable and electrically insulating support mandrel means having a first longitudinal support edge between a pair of mandrel faces; a plurality of spaced heating elements supported on said first support edge; a plurality of electrical conductors electrically connected to said heating elements respectively with each heating element having a pair of electrical conductors attached thereto with each electrical conductor of each pair of said electrical conductors extending across and in contact with a corresponding one of said mandrel faces, and retaining means for individually attaching each of said electrical conductors to said mandrel and for maintaining said spaced relationship of said heating elements.
Claim 3
Dependent Claim
45 words
A thermal print head as set forth in claim 1 wherein said retaining means includes an undercut longitudinal groove in each of said adjacent mandrel faces and a resilient slab filling each of said grooves while encompassing corresponding ones of said plurality of electrical conductors.
Claim 4
Dependent Claim
27 words
A thermal print head as set forth in claim 2 Wherein said heatng elements each includes a segment of a resistance wire passing across said support edge.
Claim 5
Dependent Claim
26 words
A thermal print head as set forth in claim 3 wherein said plurality of electrically conductors are each an electrically conductive coating on said resistance wire.
Claim 6
Dependent Claim
17 words
A thermal print head as set forth in claim 4 wherein said mandrel has a triangular cross-section.
Claim 7
Dependent Claim
29 words
A thermal print head as set forth in claim 5 and further including a printed circuit board having printed wiring thereon connected to respective ones of said electrical conductors.
Claim 8
Dependent Claim
32 words
A thermal print head as set forth in claim 1 wherein said support mandrel means includes a support mandrel having an electrically insulating coating covering the outside surface of said support mandrel.
Claim 9
Dependent Claim
105 words
A print head comprising; a thermally stable and electrically insulating support mandrel means having a first longitudinal support edge between a pair of mandrel faces; a plurality of spaced printing elements supported on said first support edge; a plurality of electrical conductors electrically connected to said printing elements respectively with each printing element having a pair of electrical conductors attached thereto with each electrical conductor of each pair of said electrical conductors extending across a corresponding one of said mandrel faces, and retaining means for individually attaching each of said electrical conductors to said mandrel and for maintaining said spaced relationship of said heating elements.
Claim 10
Dependent Claim
105 words
A print head comprising; a thermally stable and electrically insulating support mandrel means having a first longitudinal support edge between a pair of mandrel faces; a plurality of spaced printing elements supported on said first support edge; a plurality of electrical conductors electrically connected to said printing elements respectively with each printing element having a pair of electrical conductors attached thereto with each electrical conductor of each pair of said electrical conductors extending across a corresponding one of said mandrel faces, and retaining means for individually attaching each of said electrical conductors to said mandrel and for maintaining said spaced relationship of said heating elements.
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) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |