US4301476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase controlled shuttering system with selectable shuttered and unshuttered modes
Assignee: United States Department of the Navy
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Filing: 1980-09-29
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Granted: 1981-11-17
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Expires: 2000-09-29
Abstract
Abstract A shutter for an electro-cinematographic camera has synchronizing provisions to make high-speed exposures during the retrace interval of associated viewing equipment. Provision is also made for rapid change to unshuttered operation without use of a monitor by a positive lock mechanism.
Inventors
- 👤 Patrick N. Keller
- 👤 Leon G. Biesiadecki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:14
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
189 words
A shutter for a video camera comprising: a first disc of opaque material having, a first series of light passages arranged circumferentially about the center of said first disc, and a second series of light passages equal in number to said first series of light passages and arranged circumferentially about the center of said first disc each light passage of said second series being positioned in a predetermined angular relationship with an associated one of said light passages in said first series; a second disc of opaque material having, a third series of light passages arranged circumferentially about the center of said second disc, and synchronizing passage means arranged in a predetermined relationship with respect to said third series of light passages; indexing means connected to said first and second discs for selective alignment of predetermined ones of said first and third series of light passages; and a housing surrounding said first and second discs and having, an image aperture aligned with said first and third series of light passages, and synchronizing signal generating means in alignment with said second series of light passages and said synchronizing passage means.
Claim 2
Dependent Claim
189 words
A shutter for a video camera comprising: a first disc of opaque material having, a first series of light passages arranged circumferentially about the center of said first disc, and a second series of light passages equal in number to said first series of light passages and arranged circumferentially about the center of said first disc each light passage of said second series being positioned in a predetermined angular relationship with an associated one of said light passages in said first series; a second disc of opaque material having, a third series of light passages arranged circumferentially about the center of said second disc, and synchronizing passage means arranged in a predetermined relationship with respect to said third series of light passages; indexing means connected to said first and second discs for selective alignment of predetermined ones of said first and third series of light passages; and a housing surrounding said first and second discs and having, an image aperture aligned with said first and third series of light passages, and synchronizing signal generating means in alignment with said second series of light passages and said synchronizing passage means.
Claim 3
Dependent Claim
22 words
A shutter according to claim 1 further including a synchronous drive means connected to said first and second discs for rotation thereof.
Claim 4
Dependent Claim
33 words
A shutter according to claim 1 further including a stop means mounted on said housing for engaging said indexing means to selectively position said first and second discs in a reference datum position.
Claim 5
Dependent Claim
39 words
A shutter according to claim 1 wherein said first series of light passages includes two sets of passages spaced diametrically opposite one another with individual passages in each set varying from adjacent passages in area by a predetermined amount.
Claim 6
Dependent Claim
48 words
A shutter according to claim 1 wherein said second series of light passages are positioned in an angular relationship to insure that at a predetermined velocity the indexed first and third series light passages are in alignment with said image aperture during a standard video camera retrace interval.
Claim 7
Dependent Claim
32 words
A shutter according to claim 1 wherein said synchronizing signal generating means includes a source of light and a photoelectric detector mounted on opposite sides of said indexed first and second discs.
Claim 8
Dependent Claim
23 words
A shutter according to claim 1 wherein said synchronizing passage means includes a circumferential passage on the outer edge of said second disc.
Claim 9
Dependent Claim
25 words
A shutter according to claim 1 wherein said third series of light passages and said synchronizing passage means are symmetrically positioned on said second disc.
Claim 10
Dependent Claim
25 words
A shutter according to claim 1 wherein said third series of light passages and said synchronizing passage means are asymmetrically positioned on said second disc.
Claim 11
Dependent Claim
33 words
A shutter according to claim 2 further including a stop means mounted on said housing for engaging said indexing means to selectively position said first and second discs in a reference datum position.
Claim 12
Dependent Claim
39 words
A shutter according to claim 9 wherein said first series of light passages includes two sets of passages spaced diametrically opposite one another with individual passages in each set varying from adjacent passages in area by a predetermined amount.
Claim 13
Dependent Claim
48 words
A shutter according to claim 10 wherein said second series of light passages are positioned in an angular relationship to insure that at a predetermined velocity the indexed first and third series light passages are in alignment with said image aperture during a standard video camera retrace interval.
Claim 14
Dependent Claim
32 words
A shutter according to claim 11 wherein the synchronizing signal generating means includes a source of light and a photoelectric detector mounted on opposite sides of said indexed first and second discs.
Claim 15
Dependent Claim
23 words
A shutter according to claim 12 wherein said synchronizing passage means includes a circumferential passage on the outer edge of said second disc.
Claim 16
Dependent Claim
25 words
A shutter according to claim 13 wherein said third series of light passages and said synchronizing passage means are symmetrically positioned on said second disc.
Claim 17
Dependent Claim
25 words
A shutter according to claim 13 wherein said third series of light passages and said synchronizing passage means are asymmetrically positioned on said second disc.
References Cited (Backward Citations)
US4171529A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-16 | 1985-05-18 | 1985-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-16 | 1989-05-18 | 1989-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-16 | 1993-05-18 | 1993-11-17 | $7700.00 | Window Closed / Lapsed |