US3859530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infrared detection system
Assignee: International Standard Electric Corp
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Filing: 1973-09-06
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Granted: 1975-01-07
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Expires: 1993-09-06
Abstract
Abstract An infrared telescopic viewer includes a large rotatable viewing mirror which directs the image input onto a small rotating oscillating mirror to scan a circular or elliptical path over an infrared detector. The detector signal is used to modulate a lamp which reflects from the scanning mirror to provide a visible display. An electromagnetic device provides mechanical oscillation of the scanning mirror. A demultiplexer-integratormultiplexer circuit between the detector and lamp provide elemental non-uniform scan signals to improve the signal to noise ratio.
Inventors
- 👤 Arthur Edward Brewster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:45
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/02; H04N3/08; H04N3/09
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
135 words
An infrared detection system comprising a telescope receiving an image, a scanning mirror within said telescope reflecting said image, an infrared photodetector in the focal plane of the telescope, a variable drive mechanical oscillator coupled to said scanning mirror to scan said image in a closed loop of adjustable shape and amplitude over said photodetector, display means, said oscillator scanning a display trace over said display means having a shape which is a replica of at least a portion of said image closed loop, means for modulating said trace by a signal derived from the output of said photodetector, said variable drive mechanical oscillator including an electromagnet, means for energizing said electromagnet by two phase related signals whose relative phases and amplitudes are adjustable and a cantilever mounted reed supporting said mirror on said oscillator.
Claim 2
Dependent Claim
135 words
An infrared detection system comprising a telescope receiving an image, a scanning mirror within said telescope reflecting said image, an infrared photodetector in the focal plane of the telescope, a variable drive mechanical oscillator coupled to said scanning mirror to scan said image in a closed loop of adjustable shape and amplitude over said photodetector, display means, said oscillator scanning a display trace over said display means having a shape which is a replica of at least a portion of said image closed loop, means for modulating said trace by a signal derived from the output of said photodetector, said variable drive mechanical oscillator including an electromagnet, means for energizing said electromagnet by two phase related signals whose relative phases and amplitudes are adjustable and a cantilever mounted reed supporting said mirror on said oscillator.
Claim 3
Dependent Claim
31 words
The device of claim 1 including a second rotatable mirror receiving said image and directing said image toward said scanning mirror, said second mirror being rigidly coupled to said scanning mirror.
Claim 4
Dependent Claim
30 words
The device of claim 2 wherein said display means includes a lamp directing a beam of light onto said scanning mirror, and a window receiving the reflected Beam of light.
Claim 5
Dependent Claim
71 words
The device of claim 3 including a distributor coupled to said detector to receive the output thereof with a periodicity equal to that of the mechanical oscillator, integration means connected to said distributor to receive successive portions of said output, and a multiplexer connected to said integration means providing a modulated output signal, and means driving said multiplexer to sample said integration means in synchronism with the operation of said distributor.
Claim 6
Dependent Claim
34 words
The device of claim 4 including means for controlling the operation of said distributor to vary the magnitude of the phase angle of said photodetector output signal that is applied to said integration means.
Claim 7
Dependent Claim
17 words
The device of claim 5 including control means for varying the time constants of said integration means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |