US3751664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infrared detector system
Assignee: Barnes Engineering Co
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Filing: 1972-08-07
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Granted: 1973-08-07
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Expires: 1992-08-07
Abstract
Abstract A detector flake, such as a pyroelectric detector, which has leads going to the two faces of the flake, is mounted in a truncated collecting cone spaced from the truncated end from one quarter to twice the diameter of the flake. A field lens is provided imaging the entrance aperture to the optical system on a focal plane which would go through the apex of the cone if it were projected. The truncation is a mirror, except for a small central hole through which one lead for the detector passes, and as a result, both sides of the detector flake are utilized. Another modification replaces the flat mirror at the truncation with a henispherical reflecting cup and a detector flake mounted on edge, that is to say, with its surfaces parallel to the axis of the cone.
Inventors
- 👤 G Falbel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:51
CPC Classifications
G; G01; G01J; G01J5/00; G01J5/48; G01J1/00; G01J1/02; G01J1/04; G01J1/0407; G01J1/0422; G01J5/02; G01J5/08; G01J5/0806; G01J5/0815
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
183 words
In an instrument for detecting optical radiation which includes optical imaging means positioned to produce a real image substantially in a focal plane, and reflective truncated conical optics the cone angle and location being such that the cone apex if the cone had not been truncated would be located in the said focal plane, the improvement which comprises a. a detector flake for radiation of the type in which detector leads are connected to opposite sides of the detector, the detector being mounted spaced from the truncation of the cone and of smaller diameter than the truncation, the ratio between diameter and spacing from the truncation being in the range of one quarter to twice the diameter of the flake, b. a substrate across cone truncation provided with a mirrored surface and a central opening, c. a combined mounting means and lead to one side of the detector flake extending through said opening and insulated from said mirror, and d. a ground lead to the opposite side of the flake, whereby radiation is reflected and both sides of the detector flake receive radiation.
Claim 2
Dependent Claim
183 words
In an instrument for detecting optical radiation which includes optical imaging means positioned to produce a real image substantially in a focal plane, and reflective truncated conical optics the cone angle and location being such that the cone apex if the cone had not been truncated would be located in the said focal plane, the improvement which comprises a. a detector flake for radiation of the type in which detector leads are connected to opposite sides of the detector, the detector being mounted spaced from the truncation of the cone and of smaller diameter than the truncation, the ratio between diameter and spacing from the truncation being in the range of one quarter to twice the diameter of the flake, b. a substrate across cone truncation provided with a mirrored surface and a central opening, c. a combined mounting means and lead to one side of the detector flake extending through said opening and insulated from said mirror, and d. a ground lead to the opposite side of the flake, whereby radiation is reflected and both sides of the detector flake receive radiation.
Claim 3
Dependent Claim
15 words
An instrument according to claim 1 in which the detector flake is a pyroelectric detector.
Claim 4
Dependent Claim
32 words
An instrument according to claim 2 in which the lead from the detector flake passing through the substrate across cone truncation constitutes the mounting means maintaining the flake at the predetermined position.
Claim 5
Dependent Claim
37 words
An instrument according to claim 2 in which the optical imaging means comprise a Cassegrain system and a field lens at the base of the cone imaging the aperture of the Cassegrain system onto said focal plane.
Claim 6
Dependent Claim
149 words
An instrument for detecting optical radiation comprising in combination, a. optical imaging means to produce a real image substantially in the focal plane of the imaging means, b. a truncated element in the optical path between the optical imaging means and the focal plane the inner surface of said element being reflective at the wavelength of the radiation to be detected, c. a cup-shaped mirror attached to the truncated end of the element, and d. a detector flake of the type having detector leads from each side of the flake mounted on the cup-shaped mirror parallel to and at the optical axis of the reflective element, one lead being insulated from said cup-shaped mirror and the other from the other side of the flake constituting a ground lead, whereby radiation entering into the optical element from the optical imaging means is reflected onto both sides of the detector element.
Claim 7
Dependent Claim
149 words
An instrument for detecting optical radiation comprising in combination, a. optical imaging means to produce a real image substantially in the focal plane of the imaging means, b. a truncated element in the optical path between the optical imaging means and the focal plane the inner surface of said element being reflective at the wavelength of the radiation to be detected, c. a cup-shaped mirror attached to the truncated end of the element, and d. a detector flake of the type having detector leads from each side of the flake mounted on the cup-shaped mirror parallel to and at the optical axis of the reflective element, one lead being insulated from said cup-shaped mirror and the other from the other side of the flake constituting a ground lead, whereby radiation entering into the optical element from the optical imaging means is reflected onto both sides of the detector element.
Claim 8
Dependent Claim
18 words
An instrument according to claim 5 in which the truncated element is a truncated cone of circular cross-section.
Claim 9
Dependent Claim
16 words
An instrument according to claim 6 in which the detector flake is a pyroelectric detector flake.
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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |