Patent US3715486A successfully refreshed from Google Patents.
US3715486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shuttering apparatus for television cameras
Assignee: RCA Corp
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Filing: 1971-03-19
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Granted: 1973-02-06
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Expires: 1991-03-19
Abstract
Abstract The apparatus is a generally opaque disc mounted in the camera tube light path for rotation about an axis vertically displaced from the light path and having two like, diametrically opposed and generally arcuate apertures with such configurations that different horizontal areas of the photosensitive target electrode of the tube are successively and equally exposed to light from a subject during each scanning field.
Inventors
- 👤 H Wright
- 👤 R Dischert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:55
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08; G03B9/52
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
153 words
In a television camera having a pickup tube with a photosensitive target electrode receiving light from a subject and productive of subject representative video signals during successive field periods respectively comprising alternating target electrode scanning intervals and blanking intervals, light shuttering apparatus for increasing the resolution of video signals representing moving parts of said subject, said apparatus comprising: a generally opaque disc mounted in the light path between said subject and said electrode and rotatable about an axis displaced vertically from said light path, said disc having at least one transparent aperture divided into a plurality of generally arcuate sections having such respective configurations that different horizontal areas of said electrode are exposed equally to light from said subject progressively between the top and bottom thereof; and means for rotating said disc about said axis so that the exposure of each area of said electrode by said aperture is effected ahead of scansion.
Claim 2
Dependent Claim
153 words
In a television camera having a pickup tube with a photosensitive target electrode receiving light from a subject and productive of subject representative video signals during successive field periods respectively comprising alternating target electrode scanning intervals and blanking intervals, light shuttering apparatus for increasing the resolution of video signals representing moving parts of said subject, said apparatus comprising: a generally opaque disc mounted in the light path between said subject and said electrode and rotatable about an axis displaced vertically from said light path, said disc having at least one transparent aperture divided into a plurality of generally arcuate sections having such respective configurations that different horizontal areas of said electrode are exposed equally to light from said subject progressively between the top and bottom thereof; and means for rotating said disc about said axis so that the exposure of each area of said electrode by said aperture is effected ahead of scansion.
Claim 3
Dependent Claim
153 words
In a television camera having a pickup tube with a photosensitive target electrode receiving light from a subject and productive of subject representative video signals during successive field periods respectively comprising alternating target electrode scanning intervals and blanking intervals, light shuttering apparatus for increasing the resolution of video signals representing moving parts of said subject, said apparatus comprising: a generally opaque disc mounted in the light path between said subject and said electrode and rotatable about an axis displaced vertically from said light path, said disc having at least one transparent aperture divided into a plurality of generally arcuate sections having such respective configurations that different horizontal areas of said electrode are exposed equally to light from said subject progressively between the top and bottom thereof; and means for rotating said disc about said axis so that the exposure of each area of said electrode by said aperture is effected ahead of scansion.
Claim 4
Dependent Claim
153 words
In a television camera having a pickup tube with a photosensitive target electrode receiving light from a subject and productive of subject representative video signals during successive field periods respectively comprising alternating target electrode scanning intervals and blanking intervals, light shuttering apparatus for increasing the resolution of video signals representing moving parts of said subject, said apparatus comprising: a generally opaque disc mounted in the light path between said subject and said electrode and rotatable about an axis displaced vertically from said light path, said disc having at least one transparent aperture divided into a plurality of generally arcuate sections having such respective configurations that different horizontal areas of said electrode are exposed equally to light from said subject progressively between the top and bottom thereof; and means for rotating said disc about said axis so that the exposure of each area of said electrode by said aperture is effected ahead of scansion.
Claim 5
Dependent Claim
39 words
Shuttering apparatus as defined in claim 1, wherein: said aperture has a radially inner leading section, a radially outer trailing section and a radially intermediate section, said respective sections providing substantially equal light exposures of said different electrode areas.
Claim 6
Dependent Claim
59 words
Shuttering apparatus as defined in claim 2, wherein: said leading and trailing sections of said aperture are partially bounded by respective front and rear radially extending edges having the same separation angularly about said rotation axis, and the rear edge of said leading section being spaced angularly about said rotation axis from the front edge of said trailing section.
Claim 7
Dependent Claim
51 words
Shuttering apparatus as defined in claim 3, wherein: said leadIng section is further bounded by spaced relatively short radius inner and outer arcuate edges concentric about said rotation axis, and said trailing section is further bounded by spaced relatively long radius inner and outer arcuate edges concentric about said rotation axis.
Claim 8
Dependent Claim
132 words
Shuttering apparatus as defined in claim 4, wherein: said intermediate aperture section is bounded, on its inner side, by said outer concentric leading section arcuate edge and a first eccentric arcuate edge extending between the rear edges of said leading and trailing aperture sections, and on its outer edge, by said inner concentric trailing section arcuate edge and a second eccentric arcuate edge extending between the front edges of said leading and trailing aperture sections, said eccentric arcuate edges being respectively centered such that any point on said first eccentric arcuate edge has the same angular spacing about said rotation axis from a corresponding point on said second eccentric arcuate edge as the angular separation about said rotation axis of the front and rear edges of said leading and trailing aperture sections.
Claim 9
Dependent Claim
52 words
Shuttering apparatus as defined in claim 5, wherein: the angular separation about said rotation axis between the rear edge of said leading aperture section and the front edge of said trailing aperture section is a function of the angular rotation of said disc in the time of one of said blanking intervals.
Claim 10
Dependent Claim
52 words
Shuttering apparatus as defined in claim 6, wherein: the angular separation about said rotation axis between the front edge of said leading aperture section and the rear edge of said trailing aperture section is a function of the angular rotation of said disc in the time of one of said scanning intervals.
Claim 11
Dependent Claim
35 words
Shuttering apparatus as defined in claim 7, wherein: said disc has a second transport aperture like said one aperture with the respective sections thereof disposed substantially diametrically opposite to corresponding sections of said one aperture.
Claim 12
Dependent Claim
67 words
Shuttering apparatus as defined in claim 8, wherein: the angular separation about said rotation axis of the front edge of the leading section of a first one of said two apertures from the rear edge of the trailing section of the second one of said two apertures is such that the exposure time of said target electrode is approximately 25 percent of each of said field periods.
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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |