US3816655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical device for telecine systems
Assignee: Thales SA
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Filing: 1972-10-03
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Granted: 1974-06-11
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Expires: 1992-10-03
Abstract
Abstract In a twin-path optical device a telecine system carrying out interlaced scanning by means of a flying spot scanning tube, the two paths, defined for example by means of fixed mirrors respectively terminate on the two opposite faces of one and the same sector of a rotary mirror with alternate reflecting and transparent sectors. Two images of the scanned field described by the light spot of the tube are alternately obtained, by means of a single projecting lens alternately receiving the light transmitted by, and the light reflected by, the rotary mirror.
Inventors
- 👤 M Favreau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:08
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/10; G02B27/1066; G02B27/14; G02B27/143; H; H04; H04N; H04N3/00; H04N3/36; H04N3/38
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
179 words
An optical device for a telecine system carrying out interlaced scanning by means of a flying spot scanner, said optical device comprising: first and second optical channels having separate initial sections and a common terminal section including a single projection lens; means, inserted in the initial section of said first channel, for forming a first image of the flying spot of said scanner; means inserted in the initial section of said second channel for forming a second image of said flying spot; and an optical switch, on which said initial sections terminate, mounted for angular displacement about an axis and having transparent and reflective portions, for, according to its position about said axis, either (i) transmitting the light beam from said initial section of said first channel toward said lens and the light beam from said initial section of said second channel away from said lens or (ii) transmitting the light beam from said initial section of said second channel toward said lens and the light beam from said initial section of said first channel away from said lens.
Claim 2
Dependent Claim
179 words
An optical device for a telecine system carrying out interlaced scanning by means of a flying spot scanner, said optical device comprising: first and second optical channels having separate initial sections and a common terminal section including a single projection lens; means, inserted in the initial section of said first channel, for forming a first image of the flying spot of said scanner; means inserted in the initial section of said second channel for forming a second image of said flying spot; and an optical switch, on which said initial sections terminate, mounted for angular displacement about an axis and having transparent and reflective portions, for, according to its position about said axis, either (i) transmitting the light beam from said initial section of said first channel toward said lens and the light beam from said initial section of said second channel away from said lens or (ii) transmitting the light beam from said initial section of said second channel toward said lens and the light beam from said initial section of said first channel away from said lens.
Claim 3
Dependent Claim
48 words
An optical device as claimed in claim 1, wherein said optical switch is formed by the assemblage in a plane of n reflective sectors alternating With n transparent sectors, n being a positive integer and wherein said assemblage is mounted for rotating about said axis in said plane.
Claim 4
Dependent Claim
42 words
An optical device as claimed in claim 1, wherein said optical switch is formed by the assemblage in a plane of a reflective sector and a transparent sector and wherein said assemblage is mounted for oscillating about said axis in said plane.
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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |