Patent US4458982A successfully refreshed from Google Patents.
US4458982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical scanning system including a rotatable drum with mirrors and including a rotatable optical shutter
Assignee: Ferranti International PLC
•
Filing: 1982-03-24
•
Granted: 1984-07-10
•
Expires: 2002-03-24
Abstract
Abstract An optical scanning system includes scanning means arranged to scan an object field and comprising, in one form, a rotatable drum (10) carrying a plurality of pairs of mirrors (12, 13). A detector (21) is provided which is sensitive to optical radiation directed on to it by the scanning means. Means, such as telescopes (17, 22) collect radiation from at least two fields of view for presentation to the object field of the scanning means. Optical switching means are provided so that radiation reaches the detector (21) from each field of view in turn. The switching means may be an optical shutter (14) having reflective regions (15) and transparent regions (16).
Inventors
- 👤 William Blain
- 👤 Nicolas L. Brignall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:21
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/02; H04N3/08; H04N3/09; G; G02; G02B; G02B5/00; G02B5/08; G02B5/09
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
147 words
An optical scanning system which includes scanning means arranged to scan an object field and comprising a rotatable drum carrying a plurality of pairs of mirrors arranged wtih the two mirrors of a pair disposed substantially at right angles to one another with the line of intersection of the planes containing the two mirrors substantially perpendicular to the axis of rotation of the drum, detector means sensitive to optical radiation directed on to it by the scanning means, means for collecting radiation from at least two fields of view for presentation to the object field of the scanning means, and a rotatable optical shutter rotating in synchronism with the rotatable drum to ensure that radiation is directed on to the detector means from each of said at least two fields of view in succession such that the detector means is time shared between separate fields of view.
Claim 2
Dependent Claim
147 words
An optical scanning system which includes scanning means arranged to scan an object field and comprising a rotatable drum carrying a plurality of pairs of mirrors arranged wtih the two mirrors of a pair disposed substantially at right angles to one another with the line of intersection of the planes containing the two mirrors substantially perpendicular to the axis of rotation of the drum, detector means sensitive to optical radiation directed on to it by the scanning means, means for collecting radiation from at least two fields of view for presentation to the object field of the scanning means, and a rotatable optical shutter rotating in synchronism with the rotatable drum to ensure that radiation is directed on to the detector means from each of said at least two fields of view in succession such that the detector means is time shared between separate fields of view.
Claim 3
Dependent Claim
23 words
A system as claimed in claim 1 in which the means for collecting radiation from each field of view comprises an optical telescope.
Claim 4
Dependent Claim
19 words
A system as claimed in claim 1 in which the rotatable optical shutter carries alternate reflecting and transparent regions.
Claim 5
Dependent Claim
21 words
A system as claimed in claim 1 in which the rotatable optical shutter is attached to and rotatable with the drum.
Claim 6
Dependent Claim
19 words
A system as claimed in claim 1 in which the rotatable optical shutter carries alternate reflecting and transparent regions.
Claim 7
Dependent Claim
18 words
A system as claimed in claim 1 in which the detector means comprises an array of radiation-sensitive areas.
Claim 8
Dependent Claim
17 words
A system as claimed in claim 1 in which the detector means is sensitive to infra-red radiation.
Claim 9
Dependent Claim
40 words
A system as claimed in claim 1 which includes electrical circuit means having signal switching means operable to synchronism with the rotatable optical shutter to direct signals representing radiation received from each separate field of view to separate display means.
References Cited (Backward Citations)
US3219642A
Cited
US3024449A
Cited
US3543183A
Cited
US3637281A
Cited
US3765742A
Cited
US3804976A
Cited
US3813146A
Cited
US4019804A
Cited
SE7709642L
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-10 | 1988-01-09 | 1988-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-10 | 1992-01-09 | 1992-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-10 | 1996-01-09 | 1996-07-10 | $7700.00 | Window Closed / Lapsed |