US3745347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telescope including an imaging system for radiation in the visible range
Assignee: US Philips Corp
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Filing: 1971-11-26
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Granted: 1973-07-10
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Expires: 1991-11-26
Abstract
Abstract A telescope containing an imaging system for radiation in the visible range is described. The telescope is provided with a device which indicates whether an object having a temperature different from that of its surroundings is present in the central part of the field of view of the telescope. Thus, objects may be observed even at a dim scene illumination.
Inventors
- 👤 H Debrey
- 👤 P Roos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:34
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/50; G; G02; G02B; G02B23/00; G02B23/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
131 words
A thermal difference indicating telescope, comprising an image intensifier, an optical system having at least two mirrors for projecting an image of a scene on the image intensifier, the optical system having an imaginary optic axis, a correcting element for compensation of aberrations in the optical system, infrared transducing means having an imaginary optic axis coaxially with the optic axis of the optical system for detecting thermal differences between an area in the central portion of the image and the remainder of the image, and indicating means connected to the transducer means for projecting a spot of light on the center of the visible image on the image intensifier in response to an indication of a thermal difference between the central portion of the image and the remainder of the image.
Claim 2
Dependent Claim
131 words
A thermal difference indicating telescope, comprising an image intensifier, an optical system having at least two mirrors for projecting an image of a scene on the image intensifier, the optical system having an imaginary optic axis, a correcting element for compensation of aberrations in the optical system, infrared transducing means having an imaginary optic axis coaxially with the optic axis of the optical system for detecting thermal differences between an area in the central portion of the image and the remainder of the image, and indicating means connected to the transducer means for projecting a spot of light on the center of the visible image on the image intensifier in response to an indication of a thermal difference between the central portion of the image and the remainder of the image.
Claim 3
Dependent Claim
76 words
Telescope as claimed in claim 1, wherein the transducer means for infrared radiation comprises, in the order of enumeration, an objective which transmits infrared radiation and is mounted in a central opening in the correcting element for visible radiation, and a plane mirror, the indicating means including a plane mirror which can reflect the visible radiation emitted by a source of light to the center of the image formed by the imaging system for visible radiation.
Claim 4
Dependent Claim
43 words
Telescope as claimed in claim 2, wherein the plane mirrors of the transducer for infrared radiation and of the indicating means are arranged to oscillate through a small angle, about an axis at right angles to the optical axis of the optical system.
Claim 5
Dependent Claim
41 words
Telescope as claimed in claim 1, wherein the transducer means for infrared radiation includes a dichromatic reflecting layer which is provided on the correcting element and largely reflects the infrared radiation to the detection device and largely transmits the visible radiation.
Claim 6
Dependent Claim
33 words
Telescope as claimed in claim 4, wherein all the optical surfaces required to deal with the visible radiation are provided on a single member made of a material which largely transmits visible radiation.
Claim 7
Dependent Claim
42 words
Telescope as claimed in claim 1, wherein the transducer means for infrared radiation includes the elements of the imaging system for visible radiation, the last mirror in the radiation path consisting of a material which reflects visible radiation and transmits infrared radiation.
Claim 8
Dependent Claim
23 words
Telescope as claimed in claim 4, wherein the detection deviCe for infrared radiation comprises, a signal detector cell, and a reference detector cell.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |