US3875413A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infrared radiation source
Assignee: HP Inc
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Filing: 1973-10-09
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Granted: 1975-04-01
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Expires: 1993-10-09
Abstract
Abstract A source of infrared radiation is provided which includes a thin film resistive heater of high emissivity evaporated onto a substrate. The thin film heater is positioned between a pair of thin metal elements on the substrate. The resulting structure provides a well-defined, mechanically stable source. In one embodiment of the invention, the resistive element is coated with an antireflecting layer to enhance its emissivity.
Inventors
- 👤 John A Bridgham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:34
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/20; H05B3/22; H05B3/26; G; G01; G01J; G01J3/00; G01J3/02; G01J3/10; G01J3/108; H05B3/0033; H05B3/009; H05B2203/00; H05B2203/011; H05B2203/013; H05B2203/017; H05B2203/032
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
88 words
An infrared radiation source comprising: a substrate; a pair of metal strips of emissivity less than about 0.2 in the infrared region positioned on one side of the substrate; a thin film resistive heater of emissivity greater than about 0.5 in the infrared region positioned on the substrate in between the pair of metal strips to serve as a radiation source area bounded by the metal strips; and input and output leads electrically interconnected with the pair of metal strips for conducting an electrical current through the source.
Claim 2
Dependent Claim
88 words
An infrared radiation source comprising: a substrate; a pair of metal strips of emissivity less than about 0.2 in the infrared region positioned on one side of the substrate; a thin film resistive heater of emissivity greater than about 0.5 in the infrared region positioned on the substrate in between the pair of metal strips to serve as a radiation source area bounded by the metal strips; and input and output leads electrically interconnected with the pair of metal strips for conducting an electrical current through the source.
Claim 3
Dependent Claim
23 words
An infrared radiation source as in claim 1 wherein the thin film resistive heater comprises a layer of Cr3Si deposited onto the substrate.
Claim 4
Dependent Claim
24 words
An infrared radiation source as in claim 2 wherein the substrate material is selected from the group consisting of sapphire and Y2O3 and quartz.
Claim 5
Dependent Claim
24 words
An infrared radiation source as in claim 2 including an antireflecting layer on the Cr3Si layer for increasing the effective emissivity of the heater.
Claim 6
Dependent Claim
15 words
An infrared radiation source as in claim 4 wherein the antireflecting layer is of TiO2.
Claim 7
Dependent Claim
39 words
An infrared radiation source as in claim 5 including another metal strip on another side of the substrate opposite the side on which the resistive heater is deposited, for preventing spurious radiation from said other side of the substrate.
Claim 8
Dependent Claim
42 words
An infrared radiation source as in claim 6 wherein the substrate is mounted in a housing including a base and a reflecting surface mounted on the base, the reflecting surface for reflecting and focusing infrared radiation from the thin film resistive heater.
Claim 9
Dependent Claim
41 words
An infrared radiation source as in claim 7 wherein: the housing is of a circular cross section; the reflecting surface is an eliptical mirror; and the substrate and thin film resistive heater are mounted in spaced relation with the reflecting surface.
Claim 10
Dependent Claim
42 words
An infrared radiation source as in claim 7 wherein: the housing is of a circular cross section; the reflecting surface is a parabolic mirror; and the substrate and the thin film resistive heater are mounted in spaced relation with the reflecting surface.
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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |