Patent US5278580A successfully refreshed from Google Patents.
US5278580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal head
Assignee: Rohm Co Ltd
•
Filing: 1992-01-10
•
Granted: 1994-01-11
•
Expires: 2012-01-10
Abstract
Abstract A thermal head comprises a head circuit board having a surface carrying a heating resistor line and at least one drive element for heating the resistor line. The drive element is enclosed in a resinous package. At least a surface portion of the resinous package is electrostatically conductive but electrically non-conductive to work as antistat. The antistatic surface portion or entirety of the resinous package may be made of electrically non-conductive matrix resin which contains a predetermined percentage of electrically conductive substance.
Inventors
- 👤 Mineo Nishikawa
- 👤 Hiroshi Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:44
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/315; B41J2/32; B41J2/335; B41J2/33505; B41J2/3353; B41J2/33555; B41J2/3357; H; H05; H05F; H05F3/00; H10; H10W; H10W72/00; H10W72/851; H10W72/874; H10W72/884
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
96 words
A thermal head comprising a head circuit board having a surface carrying a means for generating heat by electrical resistance and at least one drive element for heating said means for generating heat by electrical resistance, said at least one drive element being enclosed in a resinous package, wherein at least a surface portion of the resinous package is electrostatically conductive but electrically non-conductive, with a volume resistivity of 10 5 -10 19 Ω·cm, to work as antistat, wherein static electricity is allowed to escape along the at least a surface portion of the resinous package.
Claim 2
Dependent Claim
96 words
A thermal head comprising a head circuit board having a surface carrying a means for generating heat by electrical resistance and at least one drive element for heating said means for generating heat by electrical resistance, said at least one drive element being enclosed in a resinous package, wherein at least a surface portion of the resinous package is electrostatically conductive but electrically non-conductive, with a volume resistivity of 10 5 -10 19 Ω·cm, to work as antistat, wherein static electricity is allowed to escape along the at least a surface portion of the resinous package.
Claim 3
Dependent Claim
28 words
The thermal head according to claim 1, wherein the resinous package has an entirety, and wherein the entirety of the resinous package is electrostatically conductive but electrically non-conductive.
Claim 4
Dependent Claim
35 words
The thermal head according to claim 1, wherein the resinous package has an inner portion which is electrostatically and electrically non-conductive, the surface portion of the resinous package along being electrostatically conductive but electrically non-conductive.
Claim 5
Dependent Claim
24 words
The thermal head according to claim 3, wherein the inner portion of the resinous package is made of resin which is highly non-conductive electrically.
Claim 6
Dependent Claim
22 words
The thermal head according to claim 3, wherein the inner portion of the resinous package is made of a relatively soft resin.
Claim 7
Dependent Claim
63 words
The thermal head according to claim 1, wherein the resinous package has an inner portion which is made of a relatively soft resin, the resinous package further having an intermediate portion which is made of a relatively hard resin, the inner and intermediate portions being electrostatically and electrically non-conductive, the surface portion of the resinous package along being electrostatically conductive but electrically non-conductive.
Claim 8
Dependent Claim
32 words
The thermal head according to claim 1, wherein the at least a surface portion of the resinous package is made of matrix resin which contains a predetermined percentage of electrically conductive substance.
References Cited (Backward Citations)
JPS5544737A
Cited
JPS59228743A
Cited
EP0157563A2
Cited
DE3433779A1
Cited
EP0235827A2
Cited
JPS6478859A
Cited
EP0359328A1
Cited
EP0368514A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-01-10 | 1997-07-12 | 1998-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-10 | 2001-07-12 | 2002-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-10 | 2005-07-12 | 2006-01-11 | $7700.00 | Window Closed / Lapsed |