US3876860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tape heater
Assignee: Panasonic Holdings Corp
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Filing: 1974-03-20
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Granted: 1975-04-08
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Expires: 1994-03-20
Abstract
Abstract A tape heater for magnetic tape duplicators based on the thermoremanent method comprises a heater body having a heating surface to be touched by a travelling magnetic tape to be heated and a plurality of heat generating means thermally coupled to the heater body. At least one of said heat generating means is controlled according to a different power-temperature characteristic with respect to the other heat generating means in response to the output of temperature detecting means detecting the temperature of the heater body.
Inventors
- 👤 Noboru Nomura
- 👤 Mitsuaki Ono
- 👤 Masahiko Yatsugake
- 👤 Yukihiro Fukushima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:52
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/86; G11B5/865
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
164 words
A tape heater comprising: a tape drive means for driving a magnetic tape to be heated at a predetermined speed; a heater body having a heating surface to be touched by the travelling magnetic tape; at least first and second electric heater means thermally coupled to said heater body, said first and second electric heater means being disposed symmetrically with respect to the longitudinal center line of the magnetic tape proceeding in contact with said heating surface; at least first and second power supply means respectively connecting said first and second electric heater means to a power source; temperature detecting means for detecting the temperature of said heater body; and at least first and second power supply control means for controlling the power supply to said first and second electric heater means, said first and second power supply control means being respectively provided in said first and second power supply means; said first and second power supply control means having respective different power-temperature characteristics.
Claim 2
Dependent Claim
164 words
A tape heater comprising: a tape drive means for driving a magnetic tape to be heated at a predetermined speed; a heater body having a heating surface to be touched by the travelling magnetic tape; at least first and second electric heater means thermally coupled to said heater body, said first and second electric heater means being disposed symmetrically with respect to the longitudinal center line of the magnetic tape proceeding in contact with said heating surface; at least first and second power supply means respectively connecting said first and second electric heater means to a power source; temperature detecting means for detecting the temperature of said heater body; and at least first and second power supply control means for controlling the power supply to said first and second electric heater means, said first and second power supply control means being respectively provided in said first and second power supply means; said first and second power supply control means having respective different power-temperature characteristics.
Claim 3
Dependent Claim
32 words
A tape heater according to claim 1, wherein said electric heater means are provided on at least one projection of the heater body projecting rearwardly with respect to the front heating surface.
Claim 4
Dependent Claim
40 words
A tape heater according to claim 2, wherein said projection extends at right angles to said heating surface and in a direction parallel to the direction of travel of the tape and has a thickness smaller than the tape width.
Claim 5
Dependent Claim
15 words
A tape heater according to claim 2, wherein a plurality of said projections are provided.
Claim 6
Dependent Claim
32 words
A tape heater according to claim 2, wherein a plurality of said projections are provided, the distance between adjacent projections increasing as one departs backwardly from the back of the heating surface.
Claim 7
Dependent Claim
87 words
A tape heater according to claim 1, wherein said temperature detecting means consists of a plurality of temperature detectors at least including a first detector provided at or near the tape arrival end of said heater body and a second detector provided at or near the tape departure end of said heater body, said first detector constructed to control said first power supply control means having a sharp power-temperature characteristic, said second detector constructed to control said second power supply control means having a gentle power-temperature characteristic.
Claim 8
Dependent Claim
51 words
A tape heater according to claim 1, wherein said temperature detecting means is disposed such that the length of the heat transfer path from said electric heater means to said detecting means is greater than the length of the heat transfer path from said electric heater means to said heating surface.
Claim 9
Dependent Claim
134 words
A tape heater according to claim 1, wherein said first and second electric heater means are arranged closely side by side with respect to the direction of tape progress, and also wherein said temperature detecting means consists of a plurality of temperature detectors, one of said detectors being provided at or near the tape arrival end of said heater body for controlling the first power supply control such that the first electric heater means provided on the tape arrival side of the heater body has a sharp power-temperature characteristic, another detector being provided at or near the tape departure end of said heater body for controlling the second power supply control means such that the second electric heater means provided on the tape departure side of the heater body has a gentle power-temperature characteristic.
Claim 10
Dependent Claim
168 words
A tape heater according to claim 1, wherein said first and second electric heater means are provided in contact with opposite sides of a projection of the heater body extending parallel to the direction of tape progress, said first heat generating means having an increased coil density portion adjacent to the tape arrival end of the heater body, said second heat generating means having an increased coil density portion adjacent to the tape departure end of the heater body, and also wherein said temperature detecting means includes a first temperature detector and a second temperature detector, said first temperature detector being provided at or near the tape arrival end of the heater body for controlling the power supply control means such that said first heat generating means has a sharp power-temperature characteristic, said second temperature detector being provided at or near the tape departure end of the heater body for controlling the power supply control means such that said second heat generating means has a gentle power-temperature characteristic.
Claim 11
Dependent Claim
157 words
A tape heater according to claim 1, wherein said heater body has a plurality of projections projecting in a comb-like form backwardly with respect to said heating surface and each having a width substantially equal to the tape width, said electric heater means being provided in contact with opposite sides of said individual projections except for the outer side of the opposite end projections, and also wherein said temperature detecting means includes a first temperature detector and a second temperature detector, said first temperature detector being provided at or near the tape arrival end of the heater body for controlling the electric heater means provided on the tape arrival side of the projections to have a sharp power-temperature characteristic, said second temperature detector being provided at or near the tape departure end of the heater body for controlling the electric heater means provided on the tape departure side of the projections to have a gentle power-temperature characteristic.
References Cited (Backward Citations)
US2915594A
Cited
US2993260A
Cited
US3465105A
Cited
US3254852A
Cited
US3825725A
Cited
US3561133A
Cited
US3703612A
Cited
US3632898A
Cited
US3699267A
Cited
US3700855A
Cited
US3699269A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |